Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_FS_H |
| 2 | #define _LINUX_FS_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/linkage.h> |
| 5 | #include <linux/wait.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/kdev_t.h> |
| 7 | #include <linux/dcache.h> |
Al Viro | 3f8206d | 2008-07-26 03:46:43 -0400 | [diff] [blame] | 8 | #include <linux/path.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/stat.h> |
| 10 | #include <linux/cache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/list.h> |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 12 | #include <linux/list_lru.h> |
Oleg Nesterov | 4f5e65a | 2013-07-08 14:24:16 -0700 | [diff] [blame] | 13 | #include <linux/llist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/radix-tree.h> |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 15 | #include <linux/rbtree.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/init.h> |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 17 | #include <linux/pid.h> |
Paul Gortmaker | 187f188 | 2011-11-23 20:12:59 -0500 | [diff] [blame] | 18 | #include <linux/bug.h> |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 19 | #include <linux/mutex.h> |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 20 | #include <linux/rwsem.h> |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 21 | #include <linux/capability.h> |
Matthew Wilcox | 6188e10 | 2008-04-18 22:21:05 -0400 | [diff] [blame] | 22 | #include <linux/semaphore.h> |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 23 | #include <linux/fiemap.h> |
Nick Piggin | ceb5bdc | 2011-01-07 17:50:05 +1100 | [diff] [blame] | 24 | #include <linux/rculist_bl.h> |
Al Viro | 07b8ce1 | 2011-06-20 10:52:57 -0400 | [diff] [blame] | 25 | #include <linux/atomic.h> |
Konstantin Khlebnikov | 83aeead | 2011-12-08 14:33:54 -0800 | [diff] [blame] | 26 | #include <linux/shrinker.h> |
Stephen Rothwell | c1aab02 | 2012-01-24 11:41:32 +1100 | [diff] [blame] | 27 | #include <linux/migrate_mode.h> |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 28 | #include <linux/uidgid.h> |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 29 | #include <linux/lockdep.h> |
Jens Axboe | c2b1ad8 | 2012-09-27 09:35:03 +0200 | [diff] [blame] | 30 | #include <linux/percpu-rwsem.h> |
David Howells | 08cce05c | 2012-10-13 10:45:06 +0100 | [diff] [blame] | 31 | #include <linux/blk_types.h> |
Oleg Nesterov | 853b39a | 2015-07-22 20:21:13 +0200 | [diff] [blame] | 32 | #include <linux/workqueue.h> |
Oleg Nesterov | 8129ed2 | 2015-08-11 17:05:04 +0200 | [diff] [blame] | 33 | #include <linux/percpu-rwsem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/byteorder.h> |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 36 | #include <uapi/linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Christoph Hellwig | b83ae6d | 2015-01-14 10:42:37 +0100 | [diff] [blame] | 38 | struct backing_dev_info; |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 39 | struct bdi_writeback; |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 40 | struct export_operations; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 41 | struct hd_geometry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | struct iovec; |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 43 | struct kiocb; |
Alexey Dobriyan | 57cc721 | 2011-01-10 08:18:25 +0200 | [diff] [blame] | 44 | struct kobject; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | struct pipe_inode_info; |
| 46 | struct poll_table_struct; |
| 47 | struct kstatfs; |
| 48 | struct vm_area_struct; |
| 49 | struct vfsmount; |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 50 | struct cred; |
Mel Gorman | a509bc1 | 2012-07-31 16:44:57 -0700 | [diff] [blame] | 51 | struct swap_info_struct; |
Cyrill Gorcunov | 55985dd | 2012-12-17 16:04:55 -0800 | [diff] [blame] | 52 | struct seq_file; |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 53 | struct workqueue_struct; |
Al Viro | 3b93f91 | 2014-02-11 21:34:08 -0500 | [diff] [blame] | 54 | struct iov_iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Denis Cheng | 74bf17c | 2007-10-16 23:26:30 -0700 | [diff] [blame] | 56 | extern void __init inode_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | extern void __init inode_init_early(void); |
Mel Gorman | 4248b0d | 2015-08-06 15:46:20 -0700 | [diff] [blame] | 58 | extern void __init files_init(void); |
| 59 | extern void __init files_maxfiles_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 61 | extern struct files_stat_struct files_stat; |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 62 | extern unsigned long get_max_files(void); |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 63 | extern int sysctl_nr_open; |
| 64 | extern struct inodes_stat_t inodes_stat; |
| 65 | extern int leases_enable, lease_break_time; |
Kees Cook | 800179c | 2012-07-25 17:29:07 -0700 | [diff] [blame] | 66 | extern int sysctl_protected_symlinks; |
| 67 | extern int sysctl_protected_hardlinks; |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | struct buffer_head; |
| 70 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
| 71 | struct buffer_head *bh_result, int create); |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 72 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 73 | ssize_t bytes, void *private); |
Dave Chinner | e842f29 | 2015-06-04 09:18:18 +1000 | [diff] [blame] | 74 | typedef void (dax_iodone_t)(struct buffer_head *bh_map, int uptodate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 76 | #define MAY_EXEC 0x00000001 |
| 77 | #define MAY_WRITE 0x00000002 |
| 78 | #define MAY_READ 0x00000004 |
| 79 | #define MAY_APPEND 0x00000008 |
| 80 | #define MAY_ACCESS 0x00000010 |
| 81 | #define MAY_OPEN 0x00000020 |
| 82 | #define MAY_CHDIR 0x00000040 |
| 83 | /* called from RCU mode, don't block */ |
| 84 | #define MAY_NOT_BLOCK 0x00000080 |
| 85 | |
| 86 | /* |
| 87 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
| 88 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
| 89 | */ |
| 90 | |
| 91 | /* file is open for reading */ |
| 92 | #define FMODE_READ ((__force fmode_t)0x1) |
| 93 | /* file is open for writing */ |
| 94 | #define FMODE_WRITE ((__force fmode_t)0x2) |
| 95 | /* file is seekable */ |
| 96 | #define FMODE_LSEEK ((__force fmode_t)0x4) |
| 97 | /* file can be accessed using pread */ |
| 98 | #define FMODE_PREAD ((__force fmode_t)0x8) |
| 99 | /* file can be accessed using pwrite */ |
| 100 | #define FMODE_PWRITE ((__force fmode_t)0x10) |
| 101 | /* File is opened for execution with sys_execve / sys_uselib */ |
| 102 | #define FMODE_EXEC ((__force fmode_t)0x20) |
| 103 | /* File is opened with O_NDELAY (only set for block devices) */ |
| 104 | #define FMODE_NDELAY ((__force fmode_t)0x40) |
| 105 | /* File is opened with O_EXCL (only set for block devices) */ |
| 106 | #define FMODE_EXCL ((__force fmode_t)0x80) |
| 107 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
| 108 | (specialy hack for floppy.c) */ |
| 109 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
| 110 | /* 32bit hashes as llseek() offset (for directories) */ |
| 111 | #define FMODE_32BITHASH ((__force fmode_t)0x200) |
| 112 | /* 64bit hashes as llseek() offset (for directories) */ |
| 113 | #define FMODE_64BITHASH ((__force fmode_t)0x400) |
| 114 | |
| 115 | /* |
| 116 | * Don't update ctime and mtime. |
| 117 | * |
| 118 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
| 119 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
| 120 | */ |
| 121 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
| 122 | |
| 123 | /* Expect random access pattern */ |
| 124 | #define FMODE_RANDOM ((__force fmode_t)0x1000) |
| 125 | |
| 126 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
| 127 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) |
| 128 | |
| 129 | /* File is opened with O_PATH; almost nothing can be done with it */ |
| 130 | #define FMODE_PATH ((__force fmode_t)0x4000) |
| 131 | |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 132 | /* File needs atomic accesses to f_pos */ |
| 133 | #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) |
Al Viro | 83f936c | 2014-03-14 12:02:47 -0400 | [diff] [blame] | 134 | /* Write access to underlying fs */ |
| 135 | #define FMODE_WRITER ((__force fmode_t)0x10000) |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 136 | /* Has read method(s) */ |
| 137 | #define FMODE_CAN_READ ((__force fmode_t)0x20000) |
| 138 | /* Has write method(s) */ |
| 139 | #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 140 | |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 141 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
David Drysdale | 75069f2 | 2015-01-08 14:32:29 -0800 | [diff] [blame] | 142 | #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 143 | |
| 144 | /* |
| 145 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector |
| 146 | * that indicates that they should check the contents of the iovec are |
| 147 | * valid, but not check the memory that the iovec elements |
| 148 | * points too. |
| 149 | */ |
| 150 | #define CHECK_IOVEC_ONLY -1 |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /* |
David Howells | 08cce05c | 2012-10-13 10:45:06 +0100 | [diff] [blame] | 153 | * The below are the various read and write types that we support. Some of |
| 154 | * them include behavioral modifiers that send information down to the |
| 155 | * block layer and IO scheduler. Terminology: |
| 156 | * |
| 157 | * The block layer uses device plugging to defer IO a little bit, in |
| 158 | * the hope that we will see more IO very shortly. This increases |
| 159 | * coalescing of adjacent IO and thus reduces the number of IOs we |
| 160 | * have to send to the device. It also allows for better queuing, |
| 161 | * if the IO isn't mergeable. If the caller is going to be waiting |
| 162 | * for the IO, then he must ensure that the device is unplugged so |
| 163 | * that the IO is dispatched to the driver. |
| 164 | * |
| 165 | * All IO is handled async in Linux. This is fine for background |
| 166 | * writes, but for reads or writes that someone waits for completion |
| 167 | * on, we want to notify the block layer and IO scheduler so that they |
| 168 | * know about it. That allows them to make better scheduling |
| 169 | * decisions. So when the below references 'sync' and 'async', it |
| 170 | * is referencing this priority hint. |
| 171 | * |
| 172 | * With that in mind, the available types are: |
| 173 | * |
| 174 | * READ A normal read operation. Device will be plugged. |
| 175 | * READ_SYNC A synchronous read. Device is not plugged, caller can |
| 176 | * immediately wait on this read without caring about |
| 177 | * unplugging. |
| 178 | * READA Used for read-ahead operations. Lower priority, and the |
| 179 | * block layer could (in theory) choose to ignore this |
| 180 | * request if it runs into resource problems. |
| 181 | * WRITE A normal async write. Device will be plugged. |
| 182 | * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
| 183 | * the hint that someone will be waiting on this IO |
| 184 | * shortly. The write equivalent of READ_SYNC. |
| 185 | * WRITE_ODIRECT Special case write for O_DIRECT only. |
| 186 | * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
| 187 | * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on |
| 188 | * non-volatile media on completion. |
| 189 | * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded |
| 190 | * by a cache flush and data is guaranteed to be on |
| 191 | * non-volatile media on completion. |
| 192 | * |
| 193 | */ |
| 194 | #define RW_MASK REQ_WRITE |
| 195 | #define RWA_MASK REQ_RAHEAD |
| 196 | |
| 197 | #define READ 0 |
| 198 | #define WRITE RW_MASK |
| 199 | #define READA RWA_MASK |
David Howells | 08cce05c | 2012-10-13 10:45:06 +0100 | [diff] [blame] | 200 | |
| 201 | #define READ_SYNC (READ | REQ_SYNC) |
| 202 | #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
| 203 | #define WRITE_ODIRECT (WRITE | REQ_SYNC) |
| 204 | #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
| 205 | #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) |
| 206 | #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) |
| 207 | |
| 208 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | * Attribute flags. These should be or-ed together to figure out what |
| 210 | * has been changed! |
| 211 | */ |
Miklos Szeredi | 9767d74 | 2008-07-01 15:01:26 +0200 | [diff] [blame] | 212 | #define ATTR_MODE (1 << 0) |
| 213 | #define ATTR_UID (1 << 1) |
| 214 | #define ATTR_GID (1 << 2) |
| 215 | #define ATTR_SIZE (1 << 3) |
| 216 | #define ATTR_ATIME (1 << 4) |
| 217 | #define ATTR_MTIME (1 << 5) |
| 218 | #define ATTR_CTIME (1 << 6) |
| 219 | #define ATTR_ATIME_SET (1 << 7) |
| 220 | #define ATTR_MTIME_SET (1 << 8) |
| 221 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
| 222 | #define ATTR_ATTR_FLAG (1 << 10) |
| 223 | #define ATTR_KILL_SUID (1 << 11) |
| 224 | #define ATTR_KILL_SGID (1 << 12) |
| 225 | #define ATTR_FILE (1 << 13) |
| 226 | #define ATTR_KILL_PRIV (1 << 14) |
| 227 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
| 228 | #define ATTR_TIMES_SET (1 << 16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
| 230 | /* |
Miklos Szeredi | 787fb6b | 2014-10-24 00:14:36 +0200 | [diff] [blame] | 231 | * Whiteout is represented by a char device. The following constants define the |
| 232 | * mode and device number to use. |
| 233 | */ |
| 234 | #define WHITEOUT_MODE 0 |
| 235 | #define WHITEOUT_DEV 0 |
| 236 | |
| 237 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | * This is the Inode Attributes structure, used for notify_change(). It |
| 239 | * uses the above definitions as flags, to know which values have changed. |
| 240 | * Also, in this manner, a Filesystem can look at only the values it cares |
| 241 | * about. Basically, these are the attributes that the VFS layer can |
| 242 | * request to change from the FS layer. |
| 243 | * |
| 244 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
| 245 | */ |
| 246 | struct iattr { |
| 247 | unsigned int ia_valid; |
| 248 | umode_t ia_mode; |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 249 | kuid_t ia_uid; |
| 250 | kgid_t ia_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | loff_t ia_size; |
| 252 | struct timespec ia_atime; |
| 253 | struct timespec ia_mtime; |
| 254 | struct timespec ia_ctime; |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 255 | |
| 256 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 257 | * Not an attribute, but an auxiliary info for filesystems wanting to |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 258 | * implement an ftruncate() like method. NOTE: filesystem should |
| 259 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
| 260 | */ |
| 261 | struct file *ia_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | }; |
| 263 | |
| 264 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | * Includes for diskquotas. |
| 266 | */ |
| 267 | #include <linux/quota.h> |
| 268 | |
Miklos Szeredi | 69c433e | 2014-10-24 00:14:39 +0200 | [diff] [blame] | 269 | /* |
| 270 | * Maximum number of layers of fs stack. Needs to be limited to |
| 271 | * prevent kernel stack overflow |
| 272 | */ |
| 273 | #define FILESYSTEM_MAX_STACK_DEPTH 2 |
| 274 | |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 275 | /** |
| 276 | * enum positive_aop_returns - aop return codes with specific semantics |
| 277 | * |
| 278 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
| 279 | * completed, that the page is still locked, and |
| 280 | * should be considered active. The VM uses this hint |
| 281 | * to return the page to the active list -- it won't |
| 282 | * be a candidate for writeback again in the near |
| 283 | * future. Other callers must be careful to unlock |
| 284 | * the page if they get this return. Returned by |
| 285 | * writepage(); |
| 286 | * |
| 287 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
| 288 | * unlocked it and the page might have been truncated. |
| 289 | * The caller should back up to acquiring a new page and |
| 290 | * trying again. The aop will be taking reasonable |
| 291 | * precautions not to livelock. If the caller held a page |
| 292 | * reference, it should drop it before retrying. Returned |
Nick Piggin | 5514476 | 2007-10-16 01:25:26 -0700 | [diff] [blame] | 293 | * by readpage(). |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 294 | * |
| 295 | * address_space_operation functions return these large constants to indicate |
| 296 | * special semantics to the caller. These are much larger than the bytes in a |
| 297 | * page to allow for functions that return the number of bytes operated on in a |
| 298 | * given page. |
| 299 | */ |
| 300 | |
| 301 | enum positive_aop_returns { |
| 302 | AOP_WRITEPAGE_ACTIVATE = 0x80000, |
| 303 | AOP_TRUNCATED_PAGE = 0x80001, |
| 304 | }; |
| 305 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 306 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
Nick Piggin | 89e1078 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 307 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 308 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
| 309 | * helper code (eg buffer layer) |
| 310 | * to clear GFP_FS from alloc */ |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* |
| 313 | * oh the beauties of C type declarations. |
| 314 | */ |
| 315 | struct page; |
| 316 | struct address_space; |
| 317 | struct writeback_control; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 319 | #define IOCB_EVENTFD (1 << 0) |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 320 | #define IOCB_APPEND (1 << 1) |
| 321 | #define IOCB_DIRECT (1 << 2) |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 322 | |
| 323 | struct kiocb { |
| 324 | struct file *ki_filp; |
| 325 | loff_t ki_pos; |
| 326 | void (*ki_complete)(struct kiocb *iocb, long ret, long ret2); |
| 327 | void *private; |
| 328 | int ki_flags; |
| 329 | }; |
| 330 | |
| 331 | static inline bool is_sync_kiocb(struct kiocb *kiocb) |
| 332 | { |
| 333 | return kiocb->ki_complete == NULL; |
| 334 | } |
| 335 | |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 336 | static inline int iocb_flags(struct file *file); |
| 337 | |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 338 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) |
| 339 | { |
| 340 | *kiocb = (struct kiocb) { |
| 341 | .ki_filp = filp, |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 342 | .ki_flags = iocb_flags(filp), |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 343 | }; |
| 344 | } |
| 345 | |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 346 | /* |
| 347 | * "descriptor" for what we're up to with a read. |
| 348 | * This allows us to use the same read code yet |
| 349 | * have multiple different users of the data that |
| 350 | * we read from a file. |
| 351 | * |
| 352 | * The simplest case just copies the data to user |
| 353 | * mode. |
| 354 | */ |
| 355 | typedef struct { |
| 356 | size_t written; |
| 357 | size_t count; |
| 358 | union { |
| 359 | char __user *buf; |
| 360 | void *data; |
| 361 | } arg; |
| 362 | int error; |
| 363 | } read_descriptor_t; |
| 364 | |
| 365 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
| 366 | unsigned long, unsigned long); |
Nick Piggin | 2f718ff | 2007-10-16 01:24:59 -0700 | [diff] [blame] | 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | struct address_space_operations { |
| 369 | int (*writepage)(struct page *page, struct writeback_control *wbc); |
| 370 | int (*readpage)(struct file *, struct page *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | /* Write back some dirty pages from this mapping. */ |
| 373 | int (*writepages)(struct address_space *, struct writeback_control *); |
| 374 | |
Andrew Morton | 4741c9f | 2006-03-24 03:18:11 -0800 | [diff] [blame] | 375 | /* Set a page dirty. Return true if this dirtied it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | int (*set_page_dirty)(struct page *page); |
| 377 | |
| 378 | int (*readpages)(struct file *filp, struct address_space *mapping, |
| 379 | struct list_head *pages, unsigned nr_pages); |
| 380 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 381 | int (*write_begin)(struct file *, struct address_space *mapping, |
| 382 | loff_t pos, unsigned len, unsigned flags, |
| 383 | struct page **pagep, void **fsdata); |
| 384 | int (*write_end)(struct file *, struct address_space *mapping, |
| 385 | loff_t pos, unsigned len, unsigned copied, |
| 386 | struct page *page, void *fsdata); |
| 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
| 389 | sector_t (*bmap)(struct address_space *, sector_t); |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 390 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 391 | int (*releasepage) (struct page *, gfp_t); |
Linus Torvalds | 6072d13 | 2010-12-01 13:35:19 -0500 | [diff] [blame] | 392 | void (*freepage)(struct page *); |
Omar Sandoval | 22c6186 | 2015-03-16 04:33:53 -0700 | [diff] [blame] | 393 | ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter, loff_t offset); |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 394 | /* |
Tang Chen | ef277c7 | 2013-07-08 16:00:21 -0700 | [diff] [blame] | 395 | * migrate the contents of a page to the specified target. If |
| 396 | * migrate_mode is MIGRATE_ASYNC, it must not block. |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 397 | */ |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 398 | int (*migratepage) (struct address_space *, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 399 | struct page *, struct page *, enum migrate_mode); |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 400 | int (*launder_page) (struct page *); |
Al Viro | c186afb4 | 2014-02-02 21:16:54 -0500 | [diff] [blame] | 401 | int (*is_partially_uptodate) (struct page *, unsigned long, |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 402 | unsigned long); |
Mel Gorman | b459722 | 2013-07-03 15:02:05 -0700 | [diff] [blame] | 403 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
Andi Kleen | 2571873 | 2009-09-16 11:50:13 +0200 | [diff] [blame] | 404 | int (*error_remove_page)(struct address_space *, struct page *); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 405 | |
| 406 | /* swapfile support */ |
Mel Gorman | a509bc1 | 2012-07-31 16:44:57 -0700 | [diff] [blame] | 407 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
| 408 | sector_t *span); |
| 409 | void (*swap_deactivate)(struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | }; |
| 411 | |
Jens Axboe | 7dcda1c | 2011-04-05 23:51:48 +0200 | [diff] [blame] | 412 | extern const struct address_space_operations empty_aops; |
| 413 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 414 | /* |
| 415 | * pagecache_write_begin/pagecache_write_end must be used by general code |
| 416 | * to write into the pagecache. |
| 417 | */ |
| 418 | int pagecache_write_begin(struct file *, struct address_space *mapping, |
| 419 | loff_t pos, unsigned len, unsigned flags, |
| 420 | struct page **pagep, void **fsdata); |
| 421 | |
| 422 | int pagecache_write_end(struct file *, struct address_space *mapping, |
| 423 | loff_t pos, unsigned len, unsigned copied, |
| 424 | struct page *page, void *fsdata); |
| 425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | struct address_space { |
| 427 | struct inode *host; /* owner: inode, block_device */ |
| 428 | struct radix_tree_root page_tree; /* radix tree of all pages */ |
Nick Piggin | 19fd623 | 2008-07-25 19:45:32 -0700 | [diff] [blame] | 429 | spinlock_t tree_lock; /* and lock protecting it */ |
David Herrmann | 4bb5f5d | 2014-08-08 14:25:25 -0700 | [diff] [blame] | 430 | atomic_t i_mmap_writable;/* count VM_SHARED mappings */ |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 431 | struct rb_root i_mmap; /* tree of private and shared mappings */ |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 432 | struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */ |
Jan Kara | 0814257 | 2011-06-27 16:18:10 -0700 | [diff] [blame] | 433 | /* Protected by tree_lock together with the radix tree */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | unsigned long nrpages; /* number of total pages */ |
Johannes Weiner | 91b0abe | 2014-04-03 14:47:49 -0700 | [diff] [blame] | 435 | unsigned long nrshadows; /* number of shadow entries */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | pgoff_t writeback_index;/* writeback starts here */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 437 | const struct address_space_operations *a_ops; /* methods */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | unsigned long flags; /* error bits/gfp mask */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | spinlock_t private_lock; /* for use by the address_space */ |
| 440 | struct list_head private_list; /* ditto */ |
Rafael Aquini | 252aa6f | 2012-12-11 16:02:35 -0800 | [diff] [blame] | 441 | void *private_data; /* ditto */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } __attribute__((aligned(sizeof(long)))); |
| 443 | /* |
| 444 | * On most architectures that alignment is already the case; but |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 445 | * must be enforced here for CRIS, to let the least significant bit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
| 447 | */ |
Andi Kleen | 87192a2 | 2012-01-12 17:20:34 -0800 | [diff] [blame] | 448 | struct request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | struct block_device { |
| 451 | dev_t bd_dev; /* not a kdev_t - it's a search key */ |
Richard Kennedy | f3ccfcd | 2011-03-22 16:33:56 -0700 | [diff] [blame] | 452 | int bd_openers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | struct inode * bd_inode; /* will die */ |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 454 | struct super_block * bd_super; |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 455 | struct mutex bd_mutex; /* open/close mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | struct list_head bd_inodes; |
Tejun Heo | 6b4517a | 2010-04-07 18:53:59 +0900 | [diff] [blame] | 457 | void * bd_claiming; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | void * bd_holder; |
| 459 | int bd_holders; |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 460 | bool bd_write_holder; |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 461 | #ifdef CONFIG_SYSFS |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 462 | struct list_head bd_holder_disks; |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 463 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | struct block_device * bd_contains; |
| 465 | unsigned bd_block_size; |
| 466 | struct hd_struct * bd_part; |
| 467 | /* number of times partitions within this device have been opened. */ |
| 468 | unsigned bd_part_count; |
| 469 | int bd_invalidated; |
| 470 | struct gendisk * bd_disk; |
Andi Kleen | 87192a2 | 2012-01-12 17:20:34 -0800 | [diff] [blame] | 471 | struct request_queue * bd_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | struct list_head bd_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | /* |
| 474 | * Private data. You must have bd_claim'ed the block_device |
| 475 | * to use this. NOTE: bd_claim allows an owner to claim |
| 476 | * the same device multiple times, the owner must take special |
| 477 | * care to not mess up bd_private for that case. |
| 478 | */ |
| 479 | unsigned long bd_private; |
Takashi Sato | fcccf50 | 2009-01-09 16:40:59 -0800 | [diff] [blame] | 480 | |
| 481 | /* The counter of freeze processes */ |
| 482 | int bd_fsfreeze_count; |
| 483 | /* Mutex for freeze */ |
| 484 | struct mutex bd_fsfreeze_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | }; |
| 486 | |
| 487 | /* |
| 488 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
| 489 | * radix trees |
| 490 | */ |
| 491 | #define PAGECACHE_TAG_DIRTY 0 |
| 492 | #define PAGECACHE_TAG_WRITEBACK 1 |
Jan Kara | f446daae | 2010-08-09 17:19:12 -0700 | [diff] [blame] | 493 | #define PAGECACHE_TAG_TOWRITE 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | int mapping_tagged(struct address_space *mapping, int tag); |
| 496 | |
Davidlohr Bueso | 8b28f62 | 2014-12-12 16:54:18 -0800 | [diff] [blame] | 497 | static inline void i_mmap_lock_write(struct address_space *mapping) |
| 498 | { |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 499 | down_write(&mapping->i_mmap_rwsem); |
Davidlohr Bueso | 8b28f62 | 2014-12-12 16:54:18 -0800 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | static inline void i_mmap_unlock_write(struct address_space *mapping) |
| 503 | { |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 504 | up_write(&mapping->i_mmap_rwsem); |
Davidlohr Bueso | 8b28f62 | 2014-12-12 16:54:18 -0800 | [diff] [blame] | 505 | } |
| 506 | |
Davidlohr Bueso | 3dec0ba | 2014-12-12 16:54:27 -0800 | [diff] [blame] | 507 | static inline void i_mmap_lock_read(struct address_space *mapping) |
| 508 | { |
| 509 | down_read(&mapping->i_mmap_rwsem); |
| 510 | } |
| 511 | |
| 512 | static inline void i_mmap_unlock_read(struct address_space *mapping) |
| 513 | { |
| 514 | up_read(&mapping->i_mmap_rwsem); |
| 515 | } |
| 516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | /* |
| 518 | * Might pages of this file be mapped into userspace? |
| 519 | */ |
| 520 | static inline int mapping_mapped(struct address_space *mapping) |
| 521 | { |
Kirill A. Shutemov | 27ba064 | 2015-02-10 14:09:59 -0800 | [diff] [blame] | 522 | return !RB_EMPTY_ROOT(&mapping->i_mmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | /* |
| 526 | * Might pages of this file have been modified in userspace? |
| 527 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
| 528 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
| 529 | * writing i.e. vma may be mprotected writable even if now readonly. |
David Herrmann | 4bb5f5d | 2014-08-08 14:25:25 -0700 | [diff] [blame] | 530 | * |
| 531 | * If i_mmap_writable is negative, no new writable mappings are allowed. You |
| 532 | * can only deny writable mappings, if none exists right now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | */ |
| 534 | static inline int mapping_writably_mapped(struct address_space *mapping) |
| 535 | { |
David Herrmann | 4bb5f5d | 2014-08-08 14:25:25 -0700 | [diff] [blame] | 536 | return atomic_read(&mapping->i_mmap_writable) > 0; |
| 537 | } |
| 538 | |
| 539 | static inline int mapping_map_writable(struct address_space *mapping) |
| 540 | { |
| 541 | return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? |
| 542 | 0 : -EPERM; |
| 543 | } |
| 544 | |
| 545 | static inline void mapping_unmap_writable(struct address_space *mapping) |
| 546 | { |
| 547 | atomic_dec(&mapping->i_mmap_writable); |
| 548 | } |
| 549 | |
| 550 | static inline int mapping_deny_writable(struct address_space *mapping) |
| 551 | { |
| 552 | return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? |
| 553 | 0 : -EBUSY; |
| 554 | } |
| 555 | |
| 556 | static inline void mapping_allow_writable(struct address_space *mapping) |
| 557 | { |
| 558 | atomic_inc(&mapping->i_mmap_writable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | /* |
| 562 | * Use sequence counter to get consistent i_size on 32-bit processors. |
| 563 | */ |
| 564 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 565 | #include <linux/seqlock.h> |
| 566 | #define __NEED_I_SIZE_ORDERED |
| 567 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
| 568 | #else |
| 569 | #define i_size_ordered_init(inode) do { } while (0) |
| 570 | #endif |
| 571 | |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 572 | struct posix_acl; |
| 573 | #define ACL_NOT_CACHED ((void *)(-1)) |
| 574 | |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 575 | #define IOP_FASTPERM 0x0001 |
| 576 | #define IOP_LOOKUP 0x0002 |
| 577 | #define IOP_NOFOLLOW 0x0004 |
| 578 | |
| 579 | /* |
| 580 | * Keep mostly read-only and often accessed (especially for |
| 581 | * the RCU path lookup and 'stat' data) fields at the beginning |
| 582 | * of the 'struct inode' |
| 583 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | struct inode { |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 585 | umode_t i_mode; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 586 | unsigned short i_opflags; |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 587 | kuid_t i_uid; |
| 588 | kgid_t i_gid; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 589 | unsigned int i_flags; |
| 590 | |
| 591 | #ifdef CONFIG_FS_POSIX_ACL |
| 592 | struct posix_acl *i_acl; |
| 593 | struct posix_acl *i_default_acl; |
| 594 | #endif |
| 595 | |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 596 | const struct inode_operations *i_op; |
| 597 | struct super_block *i_sb; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 598 | struct address_space *i_mapping; |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 599 | |
Linus Torvalds | 13e12d1 | 2011-06-08 15:18:19 -0700 | [diff] [blame] | 600 | #ifdef CONFIG_SECURITY |
| 601 | void *i_security; |
| 602 | #endif |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 603 | |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 604 | /* Stat data, not accessed from path walking */ |
| 605 | unsigned long i_ino; |
Miklos Szeredi | a78ef70 | 2011-10-28 14:13:30 +0200 | [diff] [blame] | 606 | /* |
| 607 | * Filesystems may only read i_nlink directly. They shall use the |
| 608 | * following functions for modification: |
| 609 | * |
| 610 | * (set|clear|inc|drop)_nlink |
| 611 | * inode_(inc|dec)_link_count |
| 612 | */ |
| 613 | union { |
| 614 | const unsigned int i_nlink; |
| 615 | unsigned int __i_nlink; |
| 616 | }; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 617 | dev_t i_rdev; |
Linus Torvalds | 2f9d3df | 2012-06-03 14:50:19 -0700 | [diff] [blame] | 618 | loff_t i_size; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 619 | struct timespec i_atime; |
| 620 | struct timespec i_mtime; |
| 621 | struct timespec i_ctime; |
Theodore Ts'o | 6cdbb0e | 2011-10-29 08:24:18 -0400 | [diff] [blame] | 622 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
| 623 | unsigned short i_bytes; |
Linus Torvalds | 2f9d3df | 2012-06-03 14:50:19 -0700 | [diff] [blame] | 624 | unsigned int i_blkbits; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 625 | blkcnt_t i_blocks; |
| 626 | |
| 627 | #ifdef __NEED_I_SIZE_ORDERED |
| 628 | seqcount_t i_size_seqcount; |
| 629 | #endif |
| 630 | |
| 631 | /* Misc */ |
| 632 | unsigned long i_state; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 633 | struct mutex i_mutex; |
Linus Torvalds | 13e12d1 | 2011-06-08 15:18:19 -0700 | [diff] [blame] | 634 | |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 635 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
Theodore Ts'o | a2f4870 | 2015-03-17 12:23:19 -0400 | [diff] [blame] | 636 | unsigned long dirtied_time_when; |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | struct hlist_node i_hash; |
Dave Chinner | c7f5408 | 2015-03-04 14:07:22 -0500 | [diff] [blame] | 639 | struct list_head i_io_list; /* backing dev IO list */ |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 640 | #ifdef CONFIG_CGROUP_WRITEBACK |
| 641 | struct bdi_writeback *i_wb; /* the associated cgroup wb */ |
Tejun Heo | 2a81490 | 2015-05-28 14:50:51 -0400 | [diff] [blame] | 642 | |
| 643 | /* foreign inode detection, see wbc_detach_inode() */ |
| 644 | int i_wb_frn_winner; |
| 645 | u16 i_wb_frn_avg_time; |
| 646 | u16 i_wb_frn_history; |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 647 | #endif |
Nick Piggin | 7ccf19a | 2010-10-21 11:49:30 +1100 | [diff] [blame] | 648 | struct list_head i_lru; /* inode LRU list */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | struct list_head i_sb_list; |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 650 | union { |
Al Viro | b3d9b7a | 2012-06-09 13:51:19 -0400 | [diff] [blame] | 651 | struct hlist_head i_dentry; |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 652 | struct rcu_head i_rcu; |
| 653 | }; |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 654 | u64 i_version; |
Linus Torvalds | 2f9d3df | 2012-06-03 14:50:19 -0700 | [diff] [blame] | 655 | atomic_t i_count; |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 656 | atomic_t i_dio_count; |
Theodore Ts'o | 6cdbb0e | 2011-10-29 08:24:18 -0400 | [diff] [blame] | 657 | atomic_t i_writecount; |
Mimi Zohar | d984ea6 | 2013-12-11 15:20:54 -0500 | [diff] [blame] | 658 | #ifdef CONFIG_IMA |
| 659 | atomic_t i_readcount; /* struct files open RO */ |
| 660 | #endif |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 661 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
Jeff Layton | 4a075e3 | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 662 | struct file_lock_context *i_flctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | struct address_space i_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | struct list_head i_devices; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 665 | union { |
| 666 | struct pipe_inode_info *i_pipe; |
Theodore Ts'o | eaf796e | 2006-09-27 01:50:48 -0700 | [diff] [blame] | 667 | struct block_device *i_bdev; |
Theodore Ts'o | 577c4eb | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 668 | struct cdev *i_cdev; |
Al Viro | 61ba64f | 2015-05-02 09:54:06 -0400 | [diff] [blame] | 669 | char *i_link; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 670 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
| 672 | __u32 i_generation; |
| 673 | |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 674 | #ifdef CONFIG_FSNOTIFY |
| 675 | __u32 i_fsnotify_mask; /* all events this inode cares about */ |
Eric Paris | e61ce86 | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 676 | struct hlist_head i_fsnotify_marks; |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 677 | #endif |
| 678 | |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 679 | void *i_private; /* fs or device private pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | }; |
| 681 | |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 682 | static inline int inode_unhashed(struct inode *inode) |
| 683 | { |
| 684 | return hlist_unhashed(&inode->i_hash); |
| 685 | } |
| 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | /* |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 688 | * inode->i_mutex nesting subclasses for the lock validator: |
| 689 | * |
| 690 | * 0: the object of the current VFS operation |
| 691 | * 1: parent |
| 692 | * 2: child/target |
J. Bruce Fields | 40bd22c | 2012-04-18 15:21:34 -0400 | [diff] [blame] | 693 | * 3: xattr |
| 694 | * 4: second non-directory |
Miklos Szeredi | d1b72cc | 2014-10-27 15:42:01 +0100 | [diff] [blame] | 695 | * 5: second parent (when locking independent directories in rename) |
| 696 | * |
| 697 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two |
J. Bruce Fields | 40bd22c | 2012-04-18 15:21:34 -0400 | [diff] [blame] | 698 | * non-directories at once. |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 699 | * |
| 700 | * The locking order between these classes is |
Miklos Szeredi | d1b72cc | 2014-10-27 15:42:01 +0100 | [diff] [blame] | 701 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 702 | */ |
| 703 | enum inode_i_mutex_lock_class |
| 704 | { |
| 705 | I_MUTEX_NORMAL, |
| 706 | I_MUTEX_PARENT, |
| 707 | I_MUTEX_CHILD, |
Ingo Molnar | 4df4624 | 2006-08-27 01:23:56 -0700 | [diff] [blame] | 708 | I_MUTEX_XATTR, |
Miklos Szeredi | d1b72cc | 2014-10-27 15:42:01 +0100 | [diff] [blame] | 709 | I_MUTEX_NONDIR2, |
| 710 | I_MUTEX_PARENT2, |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 711 | }; |
| 712 | |
J. Bruce Fields | 375e289 | 2012-04-18 15:16:33 -0400 | [diff] [blame] | 713 | void lock_two_nondirectories(struct inode *, struct inode*); |
| 714 | void unlock_two_nondirectories(struct inode *, struct inode*); |
| 715 | |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 716 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | * NOTE: in a 32bit arch with a preemptable kernel and |
| 718 | * an UP compile the i_size_read/write must be atomic |
| 719 | * with respect to the local cpu (unlike with preempt disabled), |
| 720 | * but they don't need to be atomic with respect to other cpus like in |
| 721 | * true SMP (so they need either to either locally disable irq around |
| 722 | * the read or for example on x86 they can be still implemented as a |
| 723 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
| 724 | * and 64bit archs it makes no difference if preempt is enabled or not. |
| 725 | */ |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 726 | static inline loff_t i_size_read(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | { |
| 728 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 729 | loff_t i_size; |
| 730 | unsigned int seq; |
| 731 | |
| 732 | do { |
| 733 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
| 734 | i_size = inode->i_size; |
| 735 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
| 736 | return i_size; |
| 737 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 738 | loff_t i_size; |
| 739 | |
| 740 | preempt_disable(); |
| 741 | i_size = inode->i_size; |
| 742 | preempt_enable(); |
| 743 | return i_size; |
| 744 | #else |
| 745 | return inode->i_size; |
| 746 | #endif |
| 747 | } |
| 748 | |
Miklos Szeredi | 7762f5a | 2006-10-17 00:10:07 -0700 | [diff] [blame] | 749 | /* |
| 750 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
| 751 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
| 752 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
| 753 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
| 755 | { |
| 756 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
Fan Du | 74e3d1e | 2013-04-30 15:27:27 -0700 | [diff] [blame] | 757 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | write_seqcount_begin(&inode->i_size_seqcount); |
| 759 | inode->i_size = i_size; |
| 760 | write_seqcount_end(&inode->i_size_seqcount); |
Fan Du | 74e3d1e | 2013-04-30 15:27:27 -0700 | [diff] [blame] | 761 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 763 | preempt_disable(); |
| 764 | inode->i_size = i_size; |
| 765 | preempt_enable(); |
| 766 | #else |
| 767 | inode->i_size = i_size; |
| 768 | #endif |
| 769 | } |
| 770 | |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 771 | /* Helper functions so that in most cases filesystems will |
| 772 | * not need to deal directly with kuid_t and kgid_t and can |
| 773 | * instead deal with the raw numeric values that are stored |
| 774 | * in the filesystem. |
| 775 | */ |
| 776 | static inline uid_t i_uid_read(const struct inode *inode) |
| 777 | { |
| 778 | return from_kuid(&init_user_ns, inode->i_uid); |
| 779 | } |
| 780 | |
| 781 | static inline gid_t i_gid_read(const struct inode *inode) |
| 782 | { |
| 783 | return from_kgid(&init_user_ns, inode->i_gid); |
| 784 | } |
| 785 | |
| 786 | static inline void i_uid_write(struct inode *inode, uid_t uid) |
| 787 | { |
| 788 | inode->i_uid = make_kuid(&init_user_ns, uid); |
| 789 | } |
| 790 | |
| 791 | static inline void i_gid_write(struct inode *inode, gid_t gid) |
| 792 | { |
| 793 | inode->i_gid = make_kgid(&init_user_ns, gid); |
| 794 | } |
| 795 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 796 | static inline unsigned iminor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
| 798 | return MINOR(inode->i_rdev); |
| 799 | } |
| 800 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 801 | static inline unsigned imajor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
| 803 | return MAJOR(inode->i_rdev); |
| 804 | } |
| 805 | |
| 806 | extern struct block_device *I_BDEV(struct inode *inode); |
| 807 | |
| 808 | struct fown_struct { |
| 809 | rwlock_t lock; /* protects pid, uid, euid fields */ |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 810 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
| 811 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 812 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | int signum; /* posix.1b rt signal to be delivered on IO */ |
| 814 | }; |
| 815 | |
| 816 | /* |
| 817 | * Track a single file's readahead state |
| 818 | */ |
| 819 | struct file_ra_state { |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 820 | pgoff_t start; /* where readahead started */ |
| 821 | unsigned int size; /* # of readahead pages */ |
| 822 | unsigned int async_size; /* do asynchronous readahead when |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 823 | there are only # of pages ahead */ |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 824 | |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 825 | unsigned int ra_pages; /* Maximum readahead window */ |
Wu Fengguang | 1ebf26a | 2009-06-16 15:31:19 -0700 | [diff] [blame] | 826 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
Fengguang Wu | f4e6b49 | 2007-10-16 01:24:33 -0700 | [diff] [blame] | 827 | loff_t prev_pos; /* Cache last read() position */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 830 | /* |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 831 | * Check if @index falls in the readahead windows. |
| 832 | */ |
| 833 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
| 834 | { |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 835 | return (index >= ra->start && |
| 836 | index < ra->start + ra->size); |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 837 | } |
| 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | struct file { |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 840 | union { |
Oleg Nesterov | 4f5e65a | 2013-07-08 14:24:16 -0700 | [diff] [blame] | 841 | struct llist_node fu_llist; |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 842 | struct rcu_head fu_rcuhead; |
| 843 | } f_u; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 844 | struct path f_path; |
Al Viro | dd37978 | 2013-03-01 19:48:30 -0500 | [diff] [blame] | 845 | struct inode *f_inode; /* cached value */ |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 846 | const struct file_operations *f_op; |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 847 | |
| 848 | /* |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 849 | * Protects f_ep_links, f_flags. |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 850 | * Must not be taken from IRQ context. |
| 851 | */ |
| 852 | spinlock_t f_lock; |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 853 | atomic_long_t f_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | unsigned int f_flags; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 855 | fmode_t f_mode; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 856 | struct mutex f_pos_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | loff_t f_pos; |
| 858 | struct fown_struct f_owner; |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 859 | const struct cred *f_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | struct file_ra_state f_ra; |
| 861 | |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 862 | u64 f_version; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 863 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | void *f_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 865 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | /* needed for tty driver, and maybe others */ |
| 867 | void *private_data; |
| 868 | |
| 869 | #ifdef CONFIG_EPOLL |
| 870 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
| 871 | struct list_head f_ep_links; |
Jason Baron | 28d82dc | 2012-01-12 17:17:43 -0800 | [diff] [blame] | 872 | struct list_head f_tfile_llink; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | #endif /* #ifdef CONFIG_EPOLL */ |
| 874 | struct address_space *f_mapping; |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 875 | } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
Aneesh Kumar K.V | 990d6c2 | 2011-01-29 18:43:26 +0530 | [diff] [blame] | 877 | struct file_handle { |
| 878 | __u32 handle_bytes; |
| 879 | int handle_type; |
| 880 | /* file identifier */ |
| 881 | unsigned char f_handle[0]; |
| 882 | }; |
| 883 | |
Al Viro | cb0942b | 2012-08-27 14:48:26 -0400 | [diff] [blame] | 884 | static inline struct file *get_file(struct file *f) |
| 885 | { |
| 886 | atomic_long_inc(&f->f_count); |
| 887 | return f; |
| 888 | } |
Konstantin Khlebnikov | 90f31d0 | 2015-04-16 12:47:56 -0700 | [diff] [blame] | 889 | #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
Al Viro | d7065da | 2010-05-26 15:13:55 -0400 | [diff] [blame] | 890 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 891 | #define file_count(x) atomic_long_read(&(x)->f_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
| 893 | #define MAX_NON_LFS ((1UL<<31) - 1) |
| 894 | |
| 895 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
| 896 | limits, otherwise bad things can happen in VM. */ |
| 897 | #if BITS_PER_LONG==32 |
Chuck Lever | 2bd2c19 | 2012-09-24 14:51:48 -0400 | [diff] [blame] | 898 | #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | #elif BITS_PER_LONG==64 |
Al Viro | 614c321 | 2012-10-10 01:06:20 -0400 | [diff] [blame] | 900 | #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | #endif |
| 902 | |
| 903 | #define FL_POSIX 1 |
| 904 | #define FL_FLOCK 2 |
J. Bruce Fields | 617588d | 2011-07-01 15:18:34 -0400 | [diff] [blame] | 905 | #define FL_DELEG 4 /* NFSv4 delegation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
Trond Myklebust | f475ae9 | 2006-06-29 16:38:32 -0400 | [diff] [blame] | 907 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | #define FL_LEASE 32 /* lease held on this file */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 909 | #define FL_CLOSE 64 /* unlock on close */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | #define FL_SLEEP 128 /* A blocking lock */ |
J. Bruce Fields | 778fc54 | 2011-07-26 18:25:49 -0400 | [diff] [blame] | 911 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
| 912 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ |
Jeff Layton | cff2fce | 2014-04-22 08:24:32 -0400 | [diff] [blame] | 913 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
Christoph Hellwig | 11afe9f | 2015-01-21 19:17:03 +0100 | [diff] [blame] | 914 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
| 916 | /* |
Miklos Szeredi | bde74e4 | 2008-07-25 01:48:57 -0700 | [diff] [blame] | 917 | * Special return value from posix_lock_file() and vfs_lock_file() for |
| 918 | * asynchronous locking. |
| 919 | */ |
| 920 | #define FILE_LOCK_DEFERRED 1 |
| 921 | |
Jeff Layton | 7ca7631 | 2014-09-01 19:04:48 -0400 | [diff] [blame] | 922 | /* legacy typedef, should eventually be removed */ |
Christoph Hellwig | 17fa388 | 2014-07-13 17:00:37 +0200 | [diff] [blame] | 923 | typedef void *fl_owner_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
Jeff Layton | a7231a9 | 2015-01-16 15:05:56 -0500 | [diff] [blame] | 925 | struct file_lock; |
| 926 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | struct file_lock_operations { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| 929 | void (*fl_release_private)(struct file_lock *); |
| 930 | }; |
| 931 | |
| 932 | struct lock_manager_operations { |
J. Bruce Fields | 8fb47a4 | 2011-07-20 20:21:59 -0400 | [diff] [blame] | 933 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
Jeff Layton | 3999e49 | 2013-06-21 08:58:19 -0400 | [diff] [blame] | 934 | unsigned long (*lm_owner_key)(struct file_lock *); |
Jeff Layton | cae80b3 | 2015-04-03 09:04:04 -0400 | [diff] [blame] | 935 | fl_owner_t (*lm_get_owner)(fl_owner_t); |
| 936 | void (*lm_put_owner)(fl_owner_t); |
J. Bruce Fields | 8fb47a4 | 2011-07-20 20:21:59 -0400 | [diff] [blame] | 937 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
Joe Perches | d0449b9 | 2014-08-22 10:18:42 -0400 | [diff] [blame] | 938 | int (*lm_grant)(struct file_lock *, int); |
Jeff Layton | 4d01b7f | 2014-09-01 15:06:54 -0400 | [diff] [blame] | 939 | bool (*lm_break)(struct file_lock *); |
Jeff Layton | 7448cc3 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 940 | int (*lm_change)(struct file_lock *, int, struct list_head *); |
Jeff Layton | 1c7dd2f | 2014-08-22 10:55:47 -0400 | [diff] [blame] | 941 | void (*lm_setup)(struct file_lock *, void **); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | }; |
| 943 | |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 944 | struct lock_manager { |
| 945 | struct list_head list; |
J. Bruce Fields | c87fb4a | 2015-08-06 12:47:02 -0400 | [diff] [blame] | 946 | /* |
| 947 | * NFSv4 and up also want opens blocked during the grace period; |
| 948 | * NLM doesn't care: |
| 949 | */ |
| 950 | bool block_opens; |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 951 | }; |
| 952 | |
Stanislav Kinsbursky | 5ccb006 | 2012-07-25 16:57:22 +0400 | [diff] [blame] | 953 | struct net; |
| 954 | void locks_start_grace(struct net *, struct lock_manager *); |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 955 | void locks_end_grace(struct lock_manager *); |
Stanislav Kinsbursky | 5ccb006 | 2012-07-25 16:57:22 +0400 | [diff] [blame] | 956 | int locks_in_grace(struct net *); |
J. Bruce Fields | c87fb4a | 2015-08-06 12:47:02 -0400 | [diff] [blame] | 957 | int opens_in_grace(struct net *); |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | /* that will die - we need it for nfs_lock_info */ |
| 960 | #include <linux/nfs_fs_i.h> |
| 961 | |
Jeff Layton | 1cb3601 | 2013-06-21 08:58:12 -0400 | [diff] [blame] | 962 | /* |
| 963 | * struct file_lock represents a generic "file lock". It's used to represent |
| 964 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to |
| 965 | * note that the same struct is used to represent both a request for a lock and |
| 966 | * the lock itself, but the same object is never used for both. |
| 967 | * |
| 968 | * FIXME: should we create a separate "struct lock_request" to help distinguish |
| 969 | * these two uses? |
| 970 | * |
Jeff Layton | 8116bf4 | 2015-01-21 20:44:01 -0500 | [diff] [blame] | 971 | * The varous i_flctx lists are ordered by: |
Jeff Layton | 1cb3601 | 2013-06-21 08:58:12 -0400 | [diff] [blame] | 972 | * |
Jeff Layton | 8116bf4 | 2015-01-21 20:44:01 -0500 | [diff] [blame] | 973 | * 1) lock owner |
| 974 | * 2) lock range start |
| 975 | * 3) lock range end |
Jeff Layton | 1cb3601 | 2013-06-21 08:58:12 -0400 | [diff] [blame] | 976 | * |
| 977 | * Obviously, the last two criteria only matter for POSIX locks. |
| 978 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | struct file_lock { |
| 980 | struct file_lock *fl_next; /* singly linked list for this inode */ |
Jeff Layton | 6dee60f | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 981 | struct list_head fl_list; /* link into file_lock_context */ |
Jeff Layton | 139ca04 | 2013-06-21 08:58:17 -0400 | [diff] [blame] | 982 | struct hlist_node fl_link; /* node in global lists */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | struct list_head fl_block; /* circular list of blocked processes */ |
| 984 | fl_owner_t fl_owner; |
J. Bruce Fields | 710b721 | 2011-07-26 16:28:29 -0400 | [diff] [blame] | 985 | unsigned int fl_flags; |
Richard Kennedy | afc1246 | 2008-07-11 17:20:49 -0700 | [diff] [blame] | 986 | unsigned char fl_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | unsigned int fl_pid; |
Jeff Layton | 7012b02 | 2013-06-21 08:58:22 -0400 | [diff] [blame] | 988 | int fl_link_cpu; /* what cpu's list is this on? */ |
Vitaliy Gusev | ab1f161 | 2008-01-17 00:07:08 +0000 | [diff] [blame] | 989 | struct pid *fl_nspid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | wait_queue_head_t fl_wait; |
| 991 | struct file *fl_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | loff_t fl_start; |
| 993 | loff_t fl_end; |
| 994 | |
| 995 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
J. Bruce Fields | 778fc54 | 2011-07-26 18:25:49 -0400 | [diff] [blame] | 996 | /* for lease breaks: */ |
| 997 | unsigned long fl_break_time; |
| 998 | unsigned long fl_downgrade_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
Alexey Dobriyan | 6aed628 | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 1000 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
Alexey Dobriyan | 7b02196 | 2009-09-21 17:01:12 -0700 | [diff] [blame] | 1001 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | union { |
| 1003 | struct nfs_lock_info nfs_fl; |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 1004 | struct nfs4_lock_info nfs4_fl; |
David Howells | e8d6c55 | 2007-07-15 23:40:12 -0700 | [diff] [blame] | 1005 | struct { |
| 1006 | struct list_head link; /* link in AFS vnode's pending_locks list */ |
| 1007 | int state; /* state of grant or error if -ve */ |
| 1008 | } afs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | } fl_u; |
| 1010 | }; |
| 1011 | |
Jeff Layton | 4a075e3 | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 1012 | struct file_lock_context { |
Jeff Layton | 6109c85 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 1013 | spinlock_t flc_lock; |
Jeff Layton | 4a075e3 | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 1014 | struct list_head flc_flock; |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 1015 | struct list_head flc_posix; |
Jeff Layton | 8634b51 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 1016 | struct list_head flc_lease; |
Jeff Layton | 4a075e3 | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 1017 | }; |
| 1018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | /* The following constant reflects the upper bound of the file/locking space */ |
| 1020 | #ifndef OFFSET_MAX |
| 1021 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
| 1022 | #define OFFSET_MAX INT_LIMIT(loff_t) |
| 1023 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
| 1024 | #endif |
| 1025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | #include <linux/fcntl.h> |
| 1027 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1028 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
| 1029 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1030 | #ifdef CONFIG_FILE_LOCKING |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 1031 | extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 1032 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
| 1033 | struct flock __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
| 1035 | #if BITS_PER_LONG == 32 |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 1036 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 1037 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
| 1038 | struct flock64 __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | #endif |
| 1040 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
| 1042 | extern int fcntl_getlease(struct file *filp); |
| 1043 | |
| 1044 | /* fs/locks.c */ |
Jeff Layton | 4a075e3 | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 1045 | void locks_free_lock_context(struct file_lock_context *ctx); |
J. Bruce Fields | 05fa313 | 2010-10-30 17:31:15 -0400 | [diff] [blame] | 1046 | void locks_free_lock(struct file_lock *fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | extern void locks_init_lock(struct file_lock *); |
Arnd Bergmann | c5b1f0d | 2010-10-27 15:46:08 +0200 | [diff] [blame] | 1048 | extern struct file_lock * locks_alloc_lock(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
Kinglong Mee | 3fe0fff1 | 2014-08-22 10:18:42 -0400 | [diff] [blame] | 1050 | extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | extern void locks_remove_posix(struct file *, fl_owner_t); |
Jeff Layton | 78ed8a1 | 2014-02-03 12:13:08 -0500 | [diff] [blame] | 1052 | extern void locks_remove_file(struct file *); |
Felix Blyakher | a9e61e2 | 2009-03-31 15:12:56 -0500 | [diff] [blame] | 1053 | extern void locks_release_private(struct file_lock *); |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 1054 | extern void posix_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 1055 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
Jeff Layton | f891a29 | 2013-06-21 08:58:09 -0400 | [diff] [blame] | 1056 | extern int posix_unblock_lock(struct file_lock *); |
J. Bruce Fields | 3ee17ab | 2007-02-21 00:58:50 -0500 | [diff] [blame] | 1057 | extern int vfs_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 1058 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
Marc Eshel | 9b9d2ab | 2007-01-18 17:52:58 -0500 | [diff] [blame] | 1059 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
Benjamin Coddington | e55c34a | 2015-10-22 13:38:13 -0400 | [diff] [blame] | 1060 | extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl); |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 1061 | extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
Jeff Layton | e6f5c78 | 2014-08-22 10:40:25 -0400 | [diff] [blame] | 1063 | extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); |
| 1064 | extern int vfs_setlease(struct file *, long, struct file_lock **, void **); |
Jeff Layton | 7448cc3 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 1065 | extern int lease_modify(struct file_lock *, int, struct list_head *); |
Andrey Vagin | 6c8c903 | 2015-04-16 12:49:38 -0700 | [diff] [blame] | 1066 | struct files_struct; |
| 1067 | extern void show_fd_locks(struct seq_file *f, |
| 1068 | struct file *filp, struct files_struct *files); |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1069 | #else /* !CONFIG_FILE_LOCKING */ |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 1070 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
| 1071 | struct flock __user *user) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1072 | { |
| 1073 | return -EINVAL; |
| 1074 | } |
| 1075 | |
| 1076 | static inline int fcntl_setlk(unsigned int fd, struct file *file, |
| 1077 | unsigned int cmd, struct flock __user *user) |
| 1078 | { |
| 1079 | return -EACCES; |
| 1080 | } |
| 1081 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1082 | #if BITS_PER_LONG == 32 |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 1083 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
| 1084 | struct flock64 __user *user) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1085 | { |
| 1086 | return -EINVAL; |
| 1087 | } |
| 1088 | |
| 1089 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
| 1090 | unsigned int cmd, struct flock64 __user *user) |
| 1091 | { |
| 1092 | return -EACCES; |
| 1093 | } |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1094 | #endif |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1095 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
| 1096 | { |
Jeff Layton | 1b2b32d | 2014-09-24 08:38:44 -0400 | [diff] [blame] | 1097 | return -EINVAL; |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1098 | } |
| 1099 | |
| 1100 | static inline int fcntl_getlease(struct file *filp) |
| 1101 | { |
Jeff Layton | 1b2b32d | 2014-09-24 08:38:44 -0400 | [diff] [blame] | 1102 | return F_UNLCK; |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1103 | } |
| 1104 | |
Jeff Layton | 4a075e3 | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 1105 | static inline void |
| 1106 | locks_free_lock_context(struct file_lock_context *ctx) |
| 1107 | { |
| 1108 | } |
| 1109 | |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1110 | static inline void locks_init_lock(struct file_lock *fl) |
| 1111 | { |
| 1112 | return; |
| 1113 | } |
| 1114 | |
Kinglong Mee | 3fe0fff1 | 2014-08-22 10:18:42 -0400 | [diff] [blame] | 1115 | static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1116 | { |
| 1117 | return; |
| 1118 | } |
| 1119 | |
| 1120 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 1121 | { |
| 1122 | return; |
| 1123 | } |
| 1124 | |
| 1125 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
| 1126 | { |
| 1127 | return; |
| 1128 | } |
| 1129 | |
Jeff Layton | 78ed8a1 | 2014-02-03 12:13:08 -0500 | [diff] [blame] | 1130 | static inline void locks_remove_file(struct file *filp) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1131 | { |
| 1132 | return; |
| 1133 | } |
| 1134 | |
| 1135 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
| 1136 | { |
| 1137 | return; |
| 1138 | } |
| 1139 | |
| 1140 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
| 1141 | struct file_lock *conflock) |
| 1142 | { |
| 1143 | return -ENOLCK; |
| 1144 | } |
| 1145 | |
Jeff Layton | f891a29 | 2013-06-21 08:58:09 -0400 | [diff] [blame] | 1146 | static inline int posix_unblock_lock(struct file_lock *waiter) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1147 | { |
| 1148 | return -ENOENT; |
| 1149 | } |
| 1150 | |
| 1151 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
| 1152 | { |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
| 1156 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
| 1157 | struct file_lock *fl, struct file_lock *conf) |
| 1158 | { |
| 1159 | return -ENOLCK; |
| 1160 | } |
| 1161 | |
| 1162 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
| 1163 | { |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
Benjamin Coddington | e55c34a | 2015-10-22 13:38:13 -0400 | [diff] [blame] | 1167 | static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
| 1168 | { |
| 1169 | return -ENOLCK; |
| 1170 | } |
| 1171 | |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 1172 | static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1173 | { |
| 1174 | return 0; |
| 1175 | } |
| 1176 | |
| 1177 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
| 1178 | { |
| 1179 | return; |
| 1180 | } |
| 1181 | |
| 1182 | static inline int generic_setlease(struct file *filp, long arg, |
Jeff Layton | e6f5c78 | 2014-08-22 10:40:25 -0400 | [diff] [blame] | 1183 | struct file_lock **flp, void **priv) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1184 | { |
| 1185 | return -EINVAL; |
| 1186 | } |
| 1187 | |
| 1188 | static inline int vfs_setlease(struct file *filp, long arg, |
Jeff Layton | e6f5c78 | 2014-08-22 10:40:25 -0400 | [diff] [blame] | 1189 | struct file_lock **lease, void **priv) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1190 | { |
| 1191 | return -EINVAL; |
| 1192 | } |
| 1193 | |
Jeff Layton | 7448cc3 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 1194 | static inline int lease_modify(struct file_lock *fl, int arg, |
Jeff Layton | c45198e | 2014-09-01 07:12:07 -0400 | [diff] [blame] | 1195 | struct list_head *dispose) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1196 | { |
| 1197 | return -EINVAL; |
| 1198 | } |
Andrey Vagin | 6c8c903 | 2015-04-16 12:49:38 -0700 | [diff] [blame] | 1199 | |
| 1200 | struct files_struct; |
| 1201 | static inline void show_fd_locks(struct seq_file *f, |
| 1202 | struct file *filp, struct files_struct *files) {} |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1203 | #endif /* !CONFIG_FILE_LOCKING */ |
| 1204 | |
Jeff Layton | ee296d7 | 2015-07-11 06:43:03 -0400 | [diff] [blame] | 1205 | static inline struct inode *file_inode(const struct file *f) |
| 1206 | { |
| 1207 | return f->f_inode; |
| 1208 | } |
| 1209 | |
Benjamin Coddington | e55c34a | 2015-10-22 13:38:13 -0400 | [diff] [blame] | 1210 | static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
| 1211 | { |
| 1212 | return locks_lock_inode_wait(file_inode(filp), fl); |
| 1213 | } |
| 1214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | struct fasync_struct { |
Eric Dumazet | 989a297 | 2010-04-14 09:55:35 +0000 | [diff] [blame] | 1216 | spinlock_t fa_lock; |
| 1217 | int magic; |
| 1218 | int fa_fd; |
| 1219 | struct fasync_struct *fa_next; /* singly linked list */ |
| 1220 | struct file *fa_file; |
| 1221 | struct rcu_head fa_rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | }; |
| 1223 | |
| 1224 | #define FASYNC_MAGIC 0x4601 |
| 1225 | |
| 1226 | /* SMP safe fasync helpers: */ |
| 1227 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
Linus Torvalds | f7347ce | 2010-10-27 12:38:12 -0400 | [diff] [blame] | 1228 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
| 1229 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); |
| 1230 | extern struct fasync_struct *fasync_alloc(void); |
| 1231 | extern void fasync_free(struct fasync_struct *); |
| 1232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | /* can be called from interrupts */ |
| 1234 | extern void kill_fasync(struct fasync_struct **, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | |
Jeff Layton | e0b93ed | 2014-08-22 11:27:32 -0400 | [diff] [blame] | 1236 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
| 1237 | extern void f_setown(struct file *filp, unsigned long arg, int force); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | extern void f_delown(struct file *filp); |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1239 | extern pid_t f_getown(struct file *filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | extern int send_sigurg(struct fown_struct *fown); |
| 1241 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1242 | struct mm_struct; |
| 1243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | /* |
| 1245 | * Umount options |
| 1246 | */ |
| 1247 | |
| 1248 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
| 1249 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
| 1250 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
Miklos Szeredi | db1f05b | 2010-02-10 12:15:53 +0100 | [diff] [blame] | 1251 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
| 1252 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | |
Tejun Heo | 46b15ca | 2015-06-16 18:48:31 -0400 | [diff] [blame] | 1254 | /* sb->s_iflags */ |
| 1255 | #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ |
Eric W. Biederman | 90f8572 | 2015-06-29 14:42:03 -0500 | [diff] [blame] | 1256 | #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1258 | /* Possible states of 'frozen' field */ |
| 1259 | enum { |
| 1260 | SB_UNFROZEN = 0, /* FS is unfrozen */ |
| 1261 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1262 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
| 1263 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop |
| 1264 | * internal threads if needed) */ |
| 1265 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ |
| 1266 | }; |
| 1267 | |
| 1268 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) |
| 1269 | |
| 1270 | struct sb_writers { |
Oleg Nesterov | 8129ed2 | 2015-08-11 17:05:04 +0200 | [diff] [blame] | 1271 | int frozen; /* Is sb frozen? */ |
| 1272 | wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ |
| 1273 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1274 | }; |
| 1275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | struct super_block { |
| 1277 | struct list_head s_list; /* Keep this first */ |
| 1278 | dev_t s_dev; /* search index; _not_ kdev_t */ |
Richard Kennedy | 270ba5f | 2010-01-26 14:12:43 +0000 | [diff] [blame] | 1279 | unsigned char s_blocksize_bits; |
| 1280 | unsigned long s_blocksize; |
Jeff Layton | 42cb56a | 2009-09-18 13:05:53 -0700 | [diff] [blame] | 1281 | loff_t s_maxbytes; /* Max file size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | struct file_system_type *s_type; |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 1283 | const struct super_operations *s_op; |
Alexey Dobriyan | 61e225d | 2009-09-21 17:01:08 -0700 | [diff] [blame] | 1284 | const struct dquot_operations *dq_op; |
Alexey Dobriyan | 0d54b21 | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1285 | const struct quotactl_ops *s_qcop; |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 1286 | const struct export_operations *s_export_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | unsigned long s_flags; |
Tejun Heo | 46b15ca | 2015-06-16 18:48:31 -0400 | [diff] [blame] | 1288 | unsigned long s_iflags; /* internal SB_I_* flags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | unsigned long s_magic; |
| 1290 | struct dentry *s_root; |
| 1291 | struct rw_semaphore s_umount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | int s_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | atomic_t s_active; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1294 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | void *s_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1296 | #endif |
Stephen Hemminger | bb43545 | 2010-05-13 17:53:14 -0700 | [diff] [blame] | 1297 | const struct xattr_handler **s_xattr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
Nick Piggin | ceb5bdc | 2011-01-07 17:50:05 +1100 | [diff] [blame] | 1299 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
Miklos Szeredi | 39f7c4d | 2011-11-21 12:11:30 +0100 | [diff] [blame] | 1300 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | struct block_device *s_bdev; |
Jens Axboe | 32a88aa | 2009-09-16 15:02:33 +0200 | [diff] [blame] | 1302 | struct backing_dev_info *s_bdi; |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 1303 | struct mtd_info *s_mtd; |
Al Viro | a516616 | 2011-12-12 22:53:00 -0500 | [diff] [blame] | 1304 | struct hlist_node s_instances; |
Jan Kara | 2c5f648 | 2014-09-30 10:43:09 +0200 | [diff] [blame] | 1305 | unsigned int s_quota_types; /* Bitmask of supported quota types */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | struct quota_info s_dquot; /* Diskquota specific options */ |
| 1307 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1308 | struct sb_writers s_writers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | |
| 1310 | char s_id[32]; /* Informational name */ |
Linus Torvalds | 0bba016 | 2011-04-12 15:21:04 -0700 | [diff] [blame] | 1311 | u8 s_uuid[16]; /* UUID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
| 1313 | void *s_fs_info; /* Filesystem private info */ |
Al Viro | 8de5277 | 2012-02-06 12:45:27 -0500 | [diff] [blame] | 1314 | unsigned int s_max_links; |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 1315 | fmode_t s_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | |
Richard Kennedy | 270ba5f | 2010-01-26 14:12:43 +0000 | [diff] [blame] | 1317 | /* Granularity of c/m/atime in ns. |
| 1318 | Cannot be worse than a second */ |
| 1319 | u32 s_time_gran; |
| 1320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | /* |
| 1322 | * The next field is for VFS *only*. No filesystems have any business |
| 1323 | * even looking at it. You had been warned. |
| 1324 | */ |
Arjan van de Ven | a11f3a0 | 2006-03-23 03:00:33 -0800 | [diff] [blame] | 1325 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 1327 | /* |
| 1328 | * Filesystem subtype. If non-empty the filesystem type field |
| 1329 | * in /proc/mounts will be "type.subtype" |
| 1330 | */ |
| 1331 | char *s_subtype; |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 1332 | |
| 1333 | /* |
| 1334 | * Saved mount options for lazy filesystems using |
| 1335 | * generic_show_options() |
| 1336 | */ |
Arnd Bergmann | 4d2deb4 | 2010-02-24 20:01:56 +0100 | [diff] [blame] | 1337 | char __rcu *s_options; |
Al Viro | c8aebb0 | 2010-12-18 10:22:30 -0500 | [diff] [blame] | 1338 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
Dan Magenheimer | 9fdfdcf | 2011-05-26 10:01:19 -0600 | [diff] [blame] | 1339 | |
| 1340 | /* |
| 1341 | * Saved pool identifier for cleancache (-1 means none) |
| 1342 | */ |
| 1343 | int cleancache_poolid; |
Dave Chinner | b0d40c9 | 2011-07-08 14:14:42 +1000 | [diff] [blame] | 1344 | |
| 1345 | struct shrinker s_shrink; /* per-sb shrinker handle */ |
Miklos Szeredi | 4ed5e82 | 2011-11-21 12:11:31 +0100 | [diff] [blame] | 1346 | |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 1347 | /* Number of inodes with nlink == 0 but still referenced */ |
| 1348 | atomic_long_t s_remove_count; |
| 1349 | |
Miklos Szeredi | 4ed5e82 | 2011-11-21 12:11:31 +0100 | [diff] [blame] | 1350 | /* Being remounted read-only */ |
| 1351 | int s_readonly_remount; |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 1352 | |
| 1353 | /* AIO completions deferred from interrupt context */ |
| 1354 | struct workqueue_struct *s_dio_done_wq; |
Al Viro | 215752f | 2014-08-07 06:23:41 -0400 | [diff] [blame] | 1355 | struct hlist_head s_pins; |
Dave Chinner | f604156 | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 1356 | |
| 1357 | /* |
| 1358 | * Keep the lru lists last in the structure so they always sit on their |
| 1359 | * own individual cachelines. |
| 1360 | */ |
| 1361 | struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; |
| 1362 | struct list_lru s_inode_lru ____cacheline_aligned_in_smp; |
Al Viro | e2fec7c | 2013-10-04 17:06:56 -0400 | [diff] [blame] | 1363 | struct rcu_head rcu; |
Oleg Nesterov | 853b39a | 2015-07-22 20:21:13 +0200 | [diff] [blame] | 1364 | struct work_struct destroy_work; |
Miklos Szeredi | 69c433e | 2014-10-24 00:14:39 +0200 | [diff] [blame] | 1365 | |
Dave Chinner | e97fedb | 2015-03-04 13:40:00 -0500 | [diff] [blame] | 1366 | struct mutex s_sync_lock; /* sync serialisation lock */ |
Miklos Szeredi | 69c433e | 2014-10-24 00:14:39 +0200 | [diff] [blame] | 1367 | |
| 1368 | /* |
| 1369 | * Indicates how deep in a filesystem stack this SB is |
| 1370 | */ |
| 1371 | int s_stack_depth; |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 1372 | |
| 1373 | /* s_inode_list_lock protects s_inodes */ |
| 1374 | spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; |
| 1375 | struct list_head s_inodes; /* all inodes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | }; |
| 1377 | |
| 1378 | extern struct timespec current_fs_time(struct super_block *sb); |
| 1379 | |
| 1380 | /* |
| 1381 | * Snapshotting support. |
| 1382 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1384 | void __sb_end_write(struct super_block *sb, int level); |
| 1385 | int __sb_start_write(struct super_block *sb, int level, bool wait); |
| 1386 | |
Oleg Nesterov | bee9182 | 2015-07-19 23:48:20 +0200 | [diff] [blame] | 1387 | #define __sb_writers_acquired(sb, lev) \ |
Oleg Nesterov | 8129ed2 | 2015-08-11 17:05:04 +0200 | [diff] [blame] | 1388 | percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
Oleg Nesterov | bee9182 | 2015-07-19 23:48:20 +0200 | [diff] [blame] | 1389 | #define __sb_writers_release(sb, lev) \ |
Oleg Nesterov | 8129ed2 | 2015-08-11 17:05:04 +0200 | [diff] [blame] | 1390 | percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
Oleg Nesterov | bee9182 | 2015-07-19 23:48:20 +0200 | [diff] [blame] | 1391 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1392 | /** |
| 1393 | * sb_end_write - drop write access to a superblock |
| 1394 | * @sb: the super we wrote to |
| 1395 | * |
| 1396 | * Decrement number of writers to the filesystem. Wake up possible waiters |
| 1397 | * wanting to freeze the filesystem. |
| 1398 | */ |
| 1399 | static inline void sb_end_write(struct super_block *sb) |
| 1400 | { |
| 1401 | __sb_end_write(sb, SB_FREEZE_WRITE); |
| 1402 | } |
| 1403 | |
| 1404 | /** |
| 1405 | * sb_end_pagefault - drop write access to a superblock from a page fault |
| 1406 | * @sb: the super we wrote to |
| 1407 | * |
| 1408 | * Decrement number of processes handling write page fault to the filesystem. |
| 1409 | * Wake up possible waiters wanting to freeze the filesystem. |
| 1410 | */ |
| 1411 | static inline void sb_end_pagefault(struct super_block *sb) |
| 1412 | { |
| 1413 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); |
| 1414 | } |
| 1415 | |
| 1416 | /** |
| 1417 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes |
| 1418 | * @sb: the super we wrote to |
| 1419 | * |
| 1420 | * Decrement fs-internal number of writers to the filesystem. Wake up possible |
| 1421 | * waiters wanting to freeze the filesystem. |
| 1422 | */ |
| 1423 | static inline void sb_end_intwrite(struct super_block *sb) |
| 1424 | { |
| 1425 | __sb_end_write(sb, SB_FREEZE_FS); |
| 1426 | } |
| 1427 | |
| 1428 | /** |
| 1429 | * sb_start_write - get write access to a superblock |
| 1430 | * @sb: the super we write to |
| 1431 | * |
| 1432 | * When a process wants to write data or metadata to a file system (i.e. dirty |
| 1433 | * a page or an inode), it should embed the operation in a sb_start_write() - |
| 1434 | * sb_end_write() pair to get exclusion against file system freezing. This |
| 1435 | * function increments number of writers preventing freezing. If the file |
| 1436 | * system is already frozen, the function waits until the file system is |
| 1437 | * thawed. |
| 1438 | * |
| 1439 | * Since freeze protection behaves as a lock, users have to preserve |
| 1440 | * ordering of freeze protection and other filesystem locks. Generally, |
| 1441 | * freeze protection should be the outermost lock. In particular, we have: |
| 1442 | * |
| 1443 | * sb_start_write |
| 1444 | * -> i_mutex (write path, truncate, directory ops, ...) |
| 1445 | * -> s_umount (freeze_super, thaw_super) |
| 1446 | */ |
| 1447 | static inline void sb_start_write(struct super_block *sb) |
| 1448 | { |
| 1449 | __sb_start_write(sb, SB_FREEZE_WRITE, true); |
| 1450 | } |
| 1451 | |
| 1452 | static inline int sb_start_write_trylock(struct super_block *sb) |
| 1453 | { |
| 1454 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); |
| 1455 | } |
| 1456 | |
| 1457 | /** |
| 1458 | * sb_start_pagefault - get write access to a superblock from a page fault |
| 1459 | * @sb: the super we write to |
| 1460 | * |
| 1461 | * When a process starts handling write page fault, it should embed the |
| 1462 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get |
| 1463 | * exclusion against file system freezing. This is needed since the page fault |
| 1464 | * is going to dirty a page. This function increments number of running page |
| 1465 | * faults preventing freezing. If the file system is already frozen, the |
| 1466 | * function waits until the file system is thawed. |
| 1467 | * |
| 1468 | * Since page fault freeze protection behaves as a lock, users have to preserve |
| 1469 | * ordering of freeze protection and other filesystem locks. It is advised to |
| 1470 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault |
| 1471 | * handling code implies lock dependency: |
| 1472 | * |
| 1473 | * mmap_sem |
| 1474 | * -> sb_start_pagefault |
| 1475 | */ |
| 1476 | static inline void sb_start_pagefault(struct super_block *sb) |
| 1477 | { |
| 1478 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); |
| 1479 | } |
| 1480 | |
| 1481 | /* |
| 1482 | * sb_start_intwrite - get write access to a superblock for internal fs purposes |
| 1483 | * @sb: the super we write to |
| 1484 | * |
| 1485 | * This is the third level of protection against filesystem freezing. It is |
| 1486 | * free for use by a filesystem. The only requirement is that it must rank |
| 1487 | * below sb_start_pagefault. |
| 1488 | * |
| 1489 | * For example filesystem can call sb_start_intwrite() when starting a |
| 1490 | * transaction which somewhat eases handling of freezing for internal sources |
| 1491 | * of filesystem changes (internal fs threads, discarding preallocation on file |
| 1492 | * close, etc.). |
| 1493 | */ |
| 1494 | static inline void sb_start_intwrite(struct super_block *sb) |
| 1495 | { |
| 1496 | __sb_start_write(sb, SB_FREEZE_FS, true); |
| 1497 | } |
| 1498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 1500 | extern bool inode_owner_or_capable(const struct inode *inode); |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 1501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | /* |
| 1503 | * VFS helper functions.. |
| 1504 | */ |
Al Viro | 312b63f | 2012-06-10 18:09:36 -0400 | [diff] [blame] | 1505 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 1506 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 1507 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1508 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
J. Bruce Fields | 146a859 | 2011-09-20 17:14:31 -0400 | [diff] [blame] | 1509 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | extern int vfs_rmdir(struct inode *, struct dentry *); |
J. Bruce Fields | b21996e | 2011-09-20 09:14:34 -0400 | [diff] [blame] | 1511 | extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
Miklos Szeredi | 520c8b1 | 2014-04-01 17:08:42 +0200 | [diff] [blame] | 1512 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
Miklos Szeredi | 787fb6b | 2014-10-24 00:14:36 +0200 | [diff] [blame] | 1513 | extern int vfs_whiteout(struct inode *, struct dentry *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | |
| 1515 | /* |
| 1516 | * VFS dentry helper functions. |
| 1517 | */ |
| 1518 | extern void dentry_unhash(struct dentry *dentry); |
| 1519 | |
| 1520 | /* |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 1521 | * VFS file helper functions. |
| 1522 | */ |
Dmitry Monakhov | a1bd120 | 2010-03-04 17:29:14 +0300 | [diff] [blame] | 1523 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
Al Viro | 62bb109 | 2011-07-24 23:20:18 -0400 | [diff] [blame] | 1524 | umode_t mode); |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 1525 | /* |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1526 | * VFS FS_IOC_FIEMAP helper definitions. |
| 1527 | */ |
| 1528 | struct fiemap_extent_info { |
| 1529 | unsigned int fi_flags; /* Flags as passed from user */ |
| 1530 | unsigned int fi_extents_mapped; /* Number of mapped extents */ |
| 1531 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
Namhyung Kim | ecf5632 | 2011-01-16 23:28:17 +0900 | [diff] [blame] | 1532 | struct fiemap_extent __user *fi_extents_start; /* Start of |
| 1533 | fiemap_extent array */ |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1534 | }; |
| 1535 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
| 1536 | u64 phys, u64 len, u32 flags); |
| 1537 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
| 1538 | |
| 1539 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | * File types |
| 1541 | * |
| 1542 | * NOTE! These match bits 12..15 of stat.st_mode |
| 1543 | * (ie "(i_mode >> 12) & 15"). |
| 1544 | */ |
| 1545 | #define DT_UNKNOWN 0 |
| 1546 | #define DT_FIFO 1 |
| 1547 | #define DT_CHR 2 |
| 1548 | #define DT_DIR 4 |
| 1549 | #define DT_BLK 6 |
| 1550 | #define DT_REG 8 |
| 1551 | #define DT_LNK 10 |
| 1552 | #define DT_SOCK 12 |
| 1553 | #define DT_WHT 14 |
| 1554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | /* |
| 1556 | * This is the "filldir" function type, used by readdir() to let |
| 1557 | * the kernel specify what kind of dirent layout it wants to have. |
| 1558 | * This allows the kernel to read directories into kernel space or |
| 1559 | * to have different dirent layouts depending on the binary type. |
| 1560 | */ |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 1561 | struct dir_context; |
| 1562 | typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, |
| 1563 | unsigned); |
| 1564 | |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 1565 | struct dir_context { |
Al Viro | ac6614b | 2013-05-22 22:22:04 -0400 | [diff] [blame] | 1566 | const filldir_t actor; |
Al Viro | bb6f619 | 2013-05-15 18:49:12 -0400 | [diff] [blame] | 1567 | loff_t pos; |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 1568 | }; |
Al Viro | bb6f619 | 2013-05-15 18:49:12 -0400 | [diff] [blame] | 1569 | |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1570 | struct block_device_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | /* These macros are for out of kernel modules to test that |
| 1573 | * the kernel supports the unlocked_ioctl and compat_ioctl |
| 1574 | * fields in struct file_operations. */ |
| 1575 | #define HAVE_COMPAT_IOCTL 1 |
| 1576 | #define HAVE_UNLOCKED_IOCTL 1 |
| 1577 | |
Christoph Hellwig | b4caecd | 2015-01-14 10:42:32 +0100 | [diff] [blame] | 1578 | /* |
| 1579 | * These flags let !MMU mmap() govern direct device mapping vs immediate |
| 1580 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. |
| 1581 | * |
| 1582 | * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) |
| 1583 | * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) |
| 1584 | * NOMMU_MAP_READ: Can be mapped for reading |
| 1585 | * NOMMU_MAP_WRITE: Can be mapped for writing |
| 1586 | * NOMMU_MAP_EXEC: Can be mapped for execution |
| 1587 | */ |
| 1588 | #define NOMMU_MAP_COPY 0x00000001 |
| 1589 | #define NOMMU_MAP_DIRECT 0x00000008 |
| 1590 | #define NOMMU_MAP_READ VM_MAYREAD |
| 1591 | #define NOMMU_MAP_WRITE VM_MAYWRITE |
| 1592 | #define NOMMU_MAP_EXEC VM_MAYEXEC |
| 1593 | |
| 1594 | #define NOMMU_VMFLAGS \ |
| 1595 | (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) |
| 1596 | |
| 1597 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1598 | struct iov_iter; |
| 1599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | struct file_operations { |
| 1601 | struct module *owner; |
| 1602 | loff_t (*llseek) (struct file *, loff_t, int); |
| 1603 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1605 | ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); |
| 1606 | ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); |
Al Viro | bb6f619 | 2013-05-15 18:49:12 -0400 | [diff] [blame] | 1607 | int (*iterate) (struct file *, struct dir_context *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
| 1610 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
| 1611 | int (*mmap) (struct file *, struct vm_area_struct *); |
| 1612 | int (*open) (struct inode *, struct file *); |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1613 | int (*flush) (struct file *, fl_owner_t id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | int (*release) (struct inode *, struct file *); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1615 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | int (*aio_fsync) (struct kiocb *, int datasync); |
| 1617 | int (*fasync) (int, struct file *, int); |
| 1618 | int (*lock) (struct file *, int, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
| 1620 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 1621 | int (*check_flags)(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | int (*flock) (struct file *, int, struct file_lock *); |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 1623 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
| 1624 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
Jeff Layton | e6f5c78 | 2014-08-22 10:40:25 -0400 | [diff] [blame] | 1625 | int (*setlease)(struct file *, long, struct file_lock **, void **); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1626 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
| 1627 | loff_t len); |
Joe Perches | a3816ab | 2014-09-29 16:08:25 -0700 | [diff] [blame] | 1628 | void (*show_fdinfo)(struct seq_file *m, struct file *f); |
Christoph Hellwig | b4caecd | 2015-01-14 10:42:32 +0100 | [diff] [blame] | 1629 | #ifndef CONFIG_MMU |
| 1630 | unsigned (*mmap_capabilities)(struct file *); |
| 1631 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | }; |
| 1633 | |
| 1634 | struct inode_operations { |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 1635 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
Al Viro | 6e77137 | 2015-05-02 13:37:52 -0400 | [diff] [blame] | 1636 | const char * (*follow_link) (struct dentry *, void **); |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1637 | int (*permission) (struct inode *, int); |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 1638 | struct posix_acl * (*get_acl)(struct inode *, int); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1639 | |
| 1640 | int (*readlink) (struct dentry *, char __user *,int); |
Al Viro | 5f2c417 | 2015-05-07 11:14:26 -0400 | [diff] [blame] | 1641 | void (*put_link) (struct inode *, void *); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1642 | |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 1643 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
| 1645 | int (*unlink) (struct inode *,struct dentry *); |
| 1646 | int (*symlink) (struct inode *,struct dentry *,const char *); |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 1647 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | int (*rmdir) (struct inode *,struct dentry *); |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 1649 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | int (*rename) (struct inode *, struct dentry *, |
| 1651 | struct inode *, struct dentry *); |
Miklos Szeredi | 520c8b1 | 2014-04-01 17:08:42 +0200 | [diff] [blame] | 1652 | int (*rename2) (struct inode *, struct dentry *, |
| 1653 | struct inode *, struct dentry *, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | int (*setattr) (struct dentry *, struct iattr *); |
| 1655 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
| 1656 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
| 1657 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
| 1658 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
| 1659 | int (*removexattr) (struct dentry *, const char *); |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1660 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
| 1661 | u64 len); |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1662 | int (*update_time)(struct inode *, struct timespec *, int); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1663 | int (*atomic_open)(struct inode *, struct dentry *, |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 1664 | struct file *, unsigned open_flag, |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1665 | umode_t create_mode, int *opened); |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 1666 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
Christoph Hellwig | 893d46e | 2013-12-20 05:16:39 -0800 | [diff] [blame] | 1667 | int (*set_acl)(struct inode *, struct posix_acl *, int); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1668 | } ____cacheline_aligned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 1670 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
Christopher Yeoh | fcf6340 | 2011-10-31 17:06:39 -0700 | [diff] [blame] | 1671 | unsigned long nr_segs, unsigned long fast_segs, |
| 1672 | struct iovec *fast_pointer, |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 1673 | struct iovec **ret_pointer); |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 1674 | |
Dmitry Kasatkin | 6fb5032 | 2014-11-05 17:01:17 +0200 | [diff] [blame] | 1675 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); |
Al Viro | 493c84c | 2015-04-03 15:06:43 -0400 | [diff] [blame] | 1676 | extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
| 1678 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
| 1679 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
| 1680 | unsigned long, loff_t *); |
| 1681 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
| 1682 | unsigned long, loff_t *); |
| 1683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | struct super_operations { |
| 1685 | struct inode *(*alloc_inode)(struct super_block *sb); |
| 1686 | void (*destroy_inode)(struct inode *); |
| 1687 | |
Christoph Hellwig | aa38572 | 2011-05-27 06:53:02 -0400 | [diff] [blame] | 1688 | void (*dirty_inode) (struct inode *, int flags); |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 1689 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1690 | int (*drop_inode) (struct inode *); |
Al Viro | be7ce41 | 2010-06-04 19:40:39 -0400 | [diff] [blame] | 1691 | void (*evict_inode) (struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | void (*put_super) (struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | int (*sync_fs)(struct super_block *sb, int wait); |
Benjamin Marzinski | 48b6bca | 2014-11-13 20:42:03 -0600 | [diff] [blame] | 1694 | int (*freeze_super) (struct super_block *); |
Takashi Sato | c4be0c1 | 2009-01-09 16:40:58 -0800 | [diff] [blame] | 1695 | int (*freeze_fs) (struct super_block *); |
Benjamin Marzinski | 48b6bca | 2014-11-13 20:42:03 -0600 | [diff] [blame] | 1696 | int (*thaw_super) (struct super_block *); |
Takashi Sato | c4be0c1 | 2009-01-09 16:40:58 -0800 | [diff] [blame] | 1697 | int (*unfreeze_fs) (struct super_block *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1698 | int (*statfs) (struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | int (*remount_fs) (struct super_block *, int *, char *); |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 1700 | void (*umount_begin) (struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 1702 | int (*show_options)(struct seq_file *, struct dentry *); |
Al Viro | d861c63 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 1703 | int (*show_devname)(struct seq_file *, struct dentry *); |
Al Viro | a6322de | 2011-12-08 21:37:57 -0500 | [diff] [blame] | 1704 | int (*show_path)(struct seq_file *, struct dentry *); |
Al Viro | 6413237 | 2011-12-08 20:51:13 -0500 | [diff] [blame] | 1705 | int (*show_stats)(struct seq_file *, struct dentry *); |
Alexey Dobriyan | 0e51a72 | 2006-09-29 01:59:56 -0700 | [diff] [blame] | 1706 | #ifdef CONFIG_QUOTA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
| 1708 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
Jan Kara | 2d0fa46 | 2014-09-25 16:36:14 +0200 | [diff] [blame] | 1709 | struct dquot **(*get_dquots)(struct inode *); |
Alexey Dobriyan | 0e51a72 | 2006-09-29 01:59:56 -0700 | [diff] [blame] | 1710 | #endif |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 1711 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
Vladimir Davydov | 4101b62 | 2015-02-12 14:58:51 -0800 | [diff] [blame] | 1712 | long (*nr_cached_objects)(struct super_block *, |
| 1713 | struct shrink_control *); |
| 1714 | long (*free_cached_objects)(struct super_block *, |
| 1715 | struct shrink_control *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | }; |
| 1717 | |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1718 | /* |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1719 | * Inode flags - they have no relation to superblock flags now |
| 1720 | */ |
| 1721 | #define S_SYNC 1 /* Writes are synced at once */ |
| 1722 | #define S_NOATIME 2 /* Do not update access times */ |
| 1723 | #define S_APPEND 4 /* Append-only file */ |
| 1724 | #define S_IMMUTABLE 8 /* Immutable file */ |
| 1725 | #define S_DEAD 16 /* removed, but still open directory */ |
| 1726 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
| 1727 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
| 1728 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
| 1729 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
| 1730 | #define S_PRIVATE 512 /* Inode is fs-internal */ |
| 1731 | #define S_IMA 1024 /* Inode has an associated IMA struct */ |
| 1732 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
| 1733 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ |
Matthew Wilcox | 6cd176a | 2015-02-16 15:59:25 -0800 | [diff] [blame] | 1734 | #ifdef CONFIG_FS_DAX |
Matthew Wilcox | fbbbad4 | 2015-02-16 15:58:53 -0800 | [diff] [blame] | 1735 | #define S_DAX 8192 /* Direct Access, avoiding the page cache */ |
| 1736 | #else |
| 1737 | #define S_DAX 0 /* Make all the DAX code disappear */ |
| 1738 | #endif |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1739 | |
| 1740 | /* |
| 1741 | * Note that nosuid etc flags are inode-specific: setting some file-system |
| 1742 | * flags just means all the inodes inherit those flags by default. It might be |
| 1743 | * possible to override it selectively if you really wanted to with some |
| 1744 | * ioctl() that is not currently implemented. |
| 1745 | * |
| 1746 | * Exception: MS_RDONLY is always applied to the entire file system. |
| 1747 | * |
| 1748 | * Unfortunately, it is possible to change a filesystems flags with it mounted |
| 1749 | * with files in use. This means that all of the inodes will not have their |
| 1750 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| 1751 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| 1752 | */ |
| 1753 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) |
| 1754 | |
| 1755 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| 1756 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| 1757 | ((inode)->i_flags & S_SYNC)) |
| 1758 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| 1759 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| 1760 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
| 1761 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
| 1762 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
| 1763 | |
| 1764 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| 1765 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| 1766 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
| 1767 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| 1768 | |
| 1769 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| 1770 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| 1771 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| 1772 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
| 1773 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
| 1774 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
| 1775 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
Matthew Wilcox | fbbbad4 | 2015-02-16 15:58:53 -0800 | [diff] [blame] | 1776 | #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1777 | |
Miklos Szeredi | 787fb6b | 2014-10-24 00:14:36 +0200 | [diff] [blame] | 1778 | #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
| 1779 | (inode)->i_rdev == WHITEOUT_DEV) |
| 1780 | |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1781 | /* |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1782 | * Inode state bits. Protected by inode->i_lock |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1783 | * |
| 1784 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
| 1785 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
| 1786 | * |
| 1787 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
| 1788 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
| 1789 | * various stages of removing an inode. |
| 1790 | * |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1791 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1792 | * |
Joern Engel | e7ca2d4 | 2008-02-06 01:36:59 -0800 | [diff] [blame] | 1793 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
| 1794 | * fdatasync(). i_atime is the usual cause. |
Jan Kara | 000cb48 | 2008-02-14 19:31:32 -0800 | [diff] [blame] | 1795 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
| 1796 | * these changes separately from I_DIRTY_SYNC so that we |
| 1797 | * don't have to write inode on fdatasync() when only |
| 1798 | * mtime has changed in it. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1799 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1800 | * I_NEW Serves as both a mutex and completion notification. |
| 1801 | * New inodes set I_NEW. If two processes both create |
| 1802 | * the same inode, one of them will release its inode and |
| 1803 | * wait for I_NEW to be released before returning. |
| 1804 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
| 1805 | * also cause waiting on I_NEW, without I_NEW actually |
| 1806 | * being set. find_inode() uses this to prevent returning |
| 1807 | * nearly-dead inodes. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1808 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
| 1809 | * is zero. I_FREEING must be set when I_WILL_FREE is |
| 1810 | * cleared. |
| 1811 | * I_FREEING Set when inode is about to be freed but still has dirty |
| 1812 | * pages or buffers attached or the inode itself is still |
| 1813 | * dirty. |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 1814 | * I_CLEAR Added by clear_inode(). In this state the inode is |
| 1815 | * clean and can be destroyed. Inode keeps I_FREEING. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1816 | * |
| 1817 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
| 1818 | * prohibited for many purposes. iget() must wait for |
| 1819 | * the inode to be completely released, then create it |
| 1820 | * anew. Other functions will just ignore such inodes, |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1821 | * if appropriate. I_NEW is used for waiting. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1822 | * |
Jan Kara | 169ebd9 | 2012-05-03 14:48:03 +0200 | [diff] [blame] | 1823 | * I_SYNC Writeback of inode is running. The bit is set during |
| 1824 | * data writeback, and cleared with a wakeup on the bit |
| 1825 | * address once it is done. The bit is also used to pin |
| 1826 | * the inode in memory for flusher thread. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1827 | * |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 1828 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
| 1829 | * |
| 1830 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). |
| 1831 | * |
Tejun Heo | 682aa8e | 2015-05-28 14:50:53 -0400 | [diff] [blame] | 1832 | * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to |
| 1833 | * synchronize competing switching instances and to tell |
| 1834 | * wb stat updates to grab mapping->tree_lock. See |
| 1835 | * inode_switch_wb_work_fn() for details. |
| 1836 | * |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1837 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1838 | */ |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1839 | #define I_DIRTY_SYNC (1 << 0) |
| 1840 | #define I_DIRTY_DATASYNC (1 << 1) |
| 1841 | #define I_DIRTY_PAGES (1 << 2) |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1842 | #define __I_NEW 3 |
| 1843 | #define I_NEW (1 << __I_NEW) |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1844 | #define I_WILL_FREE (1 << 4) |
| 1845 | #define I_FREEING (1 << 5) |
| 1846 | #define I_CLEAR (1 << 6) |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1847 | #define __I_SYNC 7 |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1848 | #define I_SYNC (1 << __I_SYNC) |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1849 | #define I_REFERENCED (1 << 8) |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 1850 | #define __I_DIO_WAKEUP 9 |
Eric Sandeen | ac74d8d | 2015-04-16 15:04:56 -0500 | [diff] [blame] | 1851 | #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP) |
Al Viro | f4e0c30 | 2013-06-11 08:34:36 +0400 | [diff] [blame] | 1852 | #define I_LINKABLE (1 << 10) |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 1853 | #define I_DIRTY_TIME (1 << 11) |
| 1854 | #define __I_DIRTY_TIME_EXPIRED 12 |
| 1855 | #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) |
Tejun Heo | 682aa8e | 2015-05-28 14:50:53 -0400 | [diff] [blame] | 1856 | #define I_WB_SWITCH (1 << 13) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | |
| 1858 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 1859 | #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | |
| 1861 | extern void __mark_inode_dirty(struct inode *, int); |
| 1862 | static inline void mark_inode_dirty(struct inode *inode) |
| 1863 | { |
| 1864 | __mark_inode_dirty(inode, I_DIRTY); |
| 1865 | } |
| 1866 | |
| 1867 | static inline void mark_inode_dirty_sync(struct inode *inode) |
| 1868 | { |
| 1869 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
| 1870 | } |
| 1871 | |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 1872 | extern void inc_nlink(struct inode *inode); |
| 1873 | extern void drop_nlink(struct inode *inode); |
| 1874 | extern void clear_nlink(struct inode *inode); |
| 1875 | extern void set_nlink(struct inode *inode, unsigned int nlink); |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 1876 | |
| 1877 | static inline void inode_inc_link_count(struct inode *inode) |
| 1878 | { |
| 1879 | inc_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1880 | mark_inode_dirty(inode); |
| 1881 | } |
| 1882 | |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1883 | static inline void inode_dec_link_count(struct inode *inode) |
| 1884 | { |
| 1885 | drop_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1886 | mark_inode_dirty(inode); |
| 1887 | } |
| 1888 | |
Jean Noel Cordenner | 25ec56b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1889 | /** |
| 1890 | * inode_inc_iversion - increments i_version |
| 1891 | * @inode: inode that need to be updated |
| 1892 | * |
| 1893 | * Every time the inode is modified, the i_version field will be incremented. |
| 1894 | * The filesystem has to be mounted with i_version flag |
| 1895 | */ |
| 1896 | |
| 1897 | static inline void inode_inc_iversion(struct inode *inode) |
| 1898 | { |
| 1899 | spin_lock(&inode->i_lock); |
| 1900 | inode->i_version++; |
| 1901 | spin_unlock(&inode->i_lock); |
| 1902 | } |
| 1903 | |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1904 | enum file_time_flags { |
| 1905 | S_ATIME = 1, |
| 1906 | S_MTIME = 2, |
| 1907 | S_CTIME = 4, |
| 1908 | S_VERSION = 8, |
| 1909 | }; |
| 1910 | |
NeilBrown | 8fa9dd2 | 2015-03-23 13:37:40 +1100 | [diff] [blame] | 1911 | extern bool atime_needs_update(const struct path *, struct inode *); |
Al Viro | badcf2b | 2013-07-16 18:15:46 +0400 | [diff] [blame] | 1912 | extern void touch_atime(const struct path *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | static inline void file_accessed(struct file *file) |
| 1914 | { |
| 1915 | if (!(file->f_flags & O_NOATIME)) |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1916 | touch_atime(&file->f_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | } |
| 1918 | |
| 1919 | int sync_inode(struct inode *inode, struct writeback_control *wbc); |
Christoph Hellwig | c3765016 | 2010-10-06 10:48:20 +0200 | [diff] [blame] | 1920 | int sync_inode_metadata(struct inode *inode, int wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | struct file_system_type { |
| 1923 | const char *name; |
| 1924 | int fs_flags; |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1925 | #define FS_REQUIRES_DEV 1 |
| 1926 | #define FS_BINARY_MOUNTDATA 2 |
| 1927 | #define FS_HAS_SUBTYPE 4 |
Eric W. Biederman | 0c55cfc | 2012-07-26 21:42:03 -0700 | [diff] [blame] | 1928 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
| 1929 | #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */ |
Eric W. Biederman | 1b852bc | 2015-05-08 23:22:29 -0500 | [diff] [blame] | 1930 | #define FS_USERNS_VISIBLE 32 /* FS must already be visible */ |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1931 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
Al Viro | c96e41e | 2010-07-25 00:17:56 +0400 | [diff] [blame] | 1932 | struct dentry *(*mount) (struct file_system_type *, int, |
| 1933 | const char *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | void (*kill_sb) (struct super_block *); |
| 1935 | struct module *owner; |
| 1936 | struct file_system_type * next; |
Al Viro | a516616 | 2011-12-12 22:53:00 -0500 | [diff] [blame] | 1937 | struct hlist_head fs_supers; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1938 | |
Ingo Molnar | cf51624 | 2006-07-03 00:25:27 -0700 | [diff] [blame] | 1939 | struct lock_class_key s_lock_key; |
Arjan van de Ven | 897c6ff | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1940 | struct lock_class_key s_umount_key; |
Roland Dreier | 51ee049 | 2010-04-27 14:23:57 -0700 | [diff] [blame] | 1941 | struct lock_class_key s_vfs_rename_key; |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1942 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1943 | |
| 1944 | struct lock_class_key i_lock_key; |
| 1945 | struct lock_class_key i_mutex_key; |
Peter Zijlstra | 14358e6 | 2007-10-14 01:38:33 +0200 | [diff] [blame] | 1946 | struct lock_class_key i_mutex_dir_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | }; |
| 1948 | |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1949 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
| 1950 | |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 1951 | extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
| 1952 | void *data, int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1953 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
| 1954 | int flags, const char *dev_name, void *data, |
| 1955 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1956 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
| 1957 | int flags, void *data, |
| 1958 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1959 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
| 1960 | int flags, void *data, |
| 1961 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 1962 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | void generic_shutdown_super(struct super_block *sb); |
| 1964 | void kill_block_super(struct super_block *sb); |
| 1965 | void kill_anon_super(struct super_block *sb); |
| 1966 | void kill_litter_super(struct super_block *sb); |
| 1967 | void deactivate_super(struct super_block *sb); |
Al Viro | 74dbbdd | 2009-05-06 01:07:50 -0400 | [diff] [blame] | 1968 | void deactivate_locked_super(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | int set_anon_super(struct super_block *s, void *data); |
Al Viro | 0ee5dc6 | 2011-07-07 15:44:25 -0400 | [diff] [blame] | 1970 | int get_anon_bdev(dev_t *); |
| 1971 | void free_anon_bdev(dev_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | struct super_block *sget(struct file_system_type *type, |
| 1973 | int (*test)(struct super_block *,void *), |
| 1974 | int (*set)(struct super_block *,void *), |
David Howells | 9249e17 | 2012-06-25 12:55:37 +0100 | [diff] [blame] | 1975 | int flags, void *data); |
Al Viro | 51139ad | 2010-07-25 23:47:46 +0400 | [diff] [blame] | 1976 | extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
Al Viro | c74a1cb | 2011-01-12 16:59:34 -0500 | [diff] [blame] | 1977 | const struct super_operations *ops, |
| 1978 | const struct dentry_operations *dops, |
| 1979 | unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | |
| 1981 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
| 1982 | #define fops_get(fops) \ |
| 1983 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
| 1984 | #define fops_put(fops) \ |
| 1985 | do { if (fops) module_put((fops)->owner); } while(0) |
Al Viro | e84f9e5 | 2013-09-22 14:17:15 -0400 | [diff] [blame] | 1986 | /* |
| 1987 | * This one is to be used *ONLY* from ->open() instances. |
| 1988 | * fops must be non-NULL, pinned down *and* module dependencies |
| 1989 | * should be sufficient to pin the caller down as well. |
| 1990 | */ |
| 1991 | #define replace_fops(f, fops) \ |
| 1992 | do { \ |
| 1993 | struct file *__file = (f); \ |
| 1994 | fops_put(__file->f_op); \ |
| 1995 | BUG_ON(!(__file->f_op = (fops))); \ |
| 1996 | } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | |
| 1998 | extern int register_filesystem(struct file_system_type *); |
| 1999 | extern int unregister_filesystem(struct file_system_type *); |
Pavel Emelyanov | 8bf9725 | 2007-10-18 23:40:02 -0700 | [diff] [blame] | 2000 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
| 2001 | #define kern_mount(type) kern_mount_data(type, NULL) |
Tim Chen | 423e0ab | 2011-07-19 09:32:38 -0700 | [diff] [blame] | 2002 | extern void kern_unmount(struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | extern int may_umount_tree(struct vfsmount *); |
| 2004 | extern int may_umount(struct vfsmount *); |
Seunghun Lee | 5e6123f | 2014-09-14 22:15:10 +0900 | [diff] [blame] | 2005 | extern long do_mount(const char *, const char __user *, |
| 2006 | const char *, unsigned long, void *); |
Al Viro | 589ff87 | 2009-04-18 03:28:19 -0400 | [diff] [blame] | 2007 | extern struct vfsmount *collect_mounts(struct path *); |
Al Viro | 8aec080 | 2007-06-07 12:20:32 -0400 | [diff] [blame] | 2008 | extern void drop_collected_mounts(struct vfsmount *); |
Al Viro | 1f70713 | 2010-01-30 22:51:25 -0500 | [diff] [blame] | 2009 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
| 2010 | struct vfsmount *); |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 2011 | extern int vfs_statfs(struct path *, struct kstatfs *); |
Al Viro | c8b91ac | 2011-03-12 10:41:39 -0500 | [diff] [blame] | 2012 | extern int user_statfs(const char __user *, struct kstatfs *); |
| 2013 | extern int fd_statfs(int, struct kstatfs *); |
Al Viro | cf31e70 | 2012-01-02 22:28:36 -0500 | [diff] [blame] | 2014 | extern int vfs_ustat(dev_t, struct kstatfs *); |
Josef Bacik | 18e9e51 | 2010-03-23 10:34:56 -0400 | [diff] [blame] | 2015 | extern int freeze_super(struct super_block *super); |
| 2016 | extern int thaw_super(struct super_block *super); |
Al Viro | 02125a8 | 2011-12-05 08:43:34 -0500 | [diff] [blame] | 2017 | extern bool our_mnt(struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 2019 | extern int current_umask(void); |
| 2020 | |
J. Bruce Fields | 5a14696 | 2012-08-28 07:50:40 -0700 | [diff] [blame] | 2021 | extern void ihold(struct inode * inode); |
| 2022 | extern void iput(struct inode *); |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 2023 | extern int generic_update_time(struct inode *, struct timespec *, int); |
J. Bruce Fields | 5a14696 | 2012-08-28 07:50:40 -0700 | [diff] [blame] | 2024 | |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 2025 | /* /sys/fs */ |
Greg Kroah-Hartman | 00d2666 | 2007-10-29 14:17:23 -0600 | [diff] [blame] | 2026 | extern struct kobject *fs_kobj; |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 2027 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 2028 | #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 2029 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | #define FLOCK_VERIFY_READ 1 |
| 2031 | #define FLOCK_VERIFY_WRITE 2 |
| 2032 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 2033 | #ifdef CONFIG_FILE_LOCKING |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 2034 | extern int locks_mandatory_locked(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
| 2036 | |
| 2037 | /* |
| 2038 | * Candidates for mandatory locking have the setgid bit set |
| 2039 | * but no group execute bit - an otherwise meaningless combination. |
| 2040 | */ |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 2041 | |
| 2042 | static inline int __mandatory_lock(struct inode *ino) |
| 2043 | { |
| 2044 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
| 2045 | } |
| 2046 | |
| 2047 | /* |
| 2048 | * ... and these candidates should be on MS_MANDLOCK mounted fs, |
| 2049 | * otherwise these will be advisory locks |
| 2050 | */ |
| 2051 | |
| 2052 | static inline int mandatory_lock(struct inode *ino) |
| 2053 | { |
| 2054 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
| 2055 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 2057 | static inline int locks_verify_locked(struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | { |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 2059 | if (mandatory_lock(file_inode(file))) |
| 2060 | return locks_mandatory_locked(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | return 0; |
| 2062 | } |
| 2063 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | static inline int locks_verify_truncate(struct inode *inode, |
| 2065 | struct file *filp, |
| 2066 | loff_t size) |
| 2067 | { |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 2068 | if (inode->i_flctx && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | return locks_mandatory_area( |
| 2070 | FLOCK_VERIFY_WRITE, inode, filp, |
| 2071 | size < inode->i_size ? size : inode->i_size, |
| 2072 | (size < inode->i_size ? inode->i_size - size |
| 2073 | : size - inode->i_size) |
| 2074 | ); |
| 2075 | return 0; |
| 2076 | } |
| 2077 | |
| 2078 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 2079 | { |
Jeff Layton | 24cbe78 | 2014-02-03 12:13:06 -0500 | [diff] [blame] | 2080 | /* |
| 2081 | * Since this check is lockless, we must ensure that any refcounts |
Jeff Layton | 8116bf4 | 2015-01-21 20:44:01 -0500 | [diff] [blame] | 2082 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
| 2083 | * could end up racing with tasks trying to set a new lease on this |
| 2084 | * file. |
Jeff Layton | 24cbe78 | 2014-02-03 12:13:06 -0500 | [diff] [blame] | 2085 | */ |
| 2086 | smp_mb(); |
Jeff Layton | 8634b51 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 2087 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 2088 | return __break_lease(inode, mode, FL_LEASE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | return 0; |
| 2090 | } |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 2091 | |
| 2092 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
| 2093 | { |
Jeff Layton | 962bd40 | 2014-06-10 12:24:40 -0400 | [diff] [blame] | 2094 | /* |
| 2095 | * Since this check is lockless, we must ensure that any refcounts |
Jeff Layton | 8116bf4 | 2015-01-21 20:44:01 -0500 | [diff] [blame] | 2096 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
| 2097 | * could end up racing with tasks trying to set a new lease on this |
| 2098 | * file. |
Jeff Layton | 962bd40 | 2014-06-10 12:24:40 -0400 | [diff] [blame] | 2099 | */ |
| 2100 | smp_mb(); |
Jeff Layton | 8634b51 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 2101 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 2102 | return __break_lease(inode, mode, FL_DELEG); |
| 2103 | return 0; |
| 2104 | } |
| 2105 | |
J. Bruce Fields | 5a14696 | 2012-08-28 07:50:40 -0700 | [diff] [blame] | 2106 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
| 2107 | { |
| 2108 | int ret; |
| 2109 | |
| 2110 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); |
| 2111 | if (ret == -EWOULDBLOCK && delegated_inode) { |
| 2112 | *delegated_inode = inode; |
| 2113 | ihold(inode); |
| 2114 | } |
| 2115 | return ret; |
| 2116 | } |
| 2117 | |
| 2118 | static inline int break_deleg_wait(struct inode **delegated_inode) |
| 2119 | { |
| 2120 | int ret; |
| 2121 | |
| 2122 | ret = break_deleg(*delegated_inode, O_WRONLY); |
| 2123 | iput(*delegated_inode); |
| 2124 | *delegated_inode = NULL; |
| 2125 | return ret; |
| 2126 | } |
| 2127 | |
Christoph Hellwig | 11afe9f | 2015-01-21 19:17:03 +0100 | [diff] [blame] | 2128 | static inline int break_layout(struct inode *inode, bool wait) |
| 2129 | { |
| 2130 | smp_mb(); |
| 2131 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
| 2132 | return __break_lease(inode, |
| 2133 | wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, |
| 2134 | FL_LAYOUT); |
| 2135 | return 0; |
| 2136 | } |
| 2137 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 2138 | #else /* !CONFIG_FILE_LOCKING */ |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 2139 | static inline int locks_mandatory_locked(struct file *file) |
Steven Whitehouse | af5df56 | 2009-01-20 10:29:46 +0000 | [diff] [blame] | 2140 | { |
| 2141 | return 0; |
| 2142 | } |
| 2143 | |
| 2144 | static inline int locks_mandatory_area(int rw, struct inode *inode, |
| 2145 | struct file *filp, loff_t offset, |
| 2146 | size_t count) |
| 2147 | { |
| 2148 | return 0; |
| 2149 | } |
| 2150 | |
| 2151 | static inline int __mandatory_lock(struct inode *inode) |
| 2152 | { |
| 2153 | return 0; |
| 2154 | } |
| 2155 | |
| 2156 | static inline int mandatory_lock(struct inode *inode) |
| 2157 | { |
| 2158 | return 0; |
| 2159 | } |
| 2160 | |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 2161 | static inline int locks_verify_locked(struct file *file) |
Steven Whitehouse | af5df56 | 2009-01-20 10:29:46 +0000 | [diff] [blame] | 2162 | { |
| 2163 | return 0; |
| 2164 | } |
| 2165 | |
| 2166 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
| 2167 | size_t size) |
| 2168 | { |
| 2169 | return 0; |
| 2170 | } |
| 2171 | |
| 2172 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 2173 | { |
| 2174 | return 0; |
| 2175 | } |
| 2176 | |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 2177 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
| 2178 | { |
| 2179 | return 0; |
| 2180 | } |
J. Bruce Fields | 5a14696 | 2012-08-28 07:50:40 -0700 | [diff] [blame] | 2181 | |
| 2182 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
| 2183 | { |
| 2184 | return 0; |
| 2185 | } |
| 2186 | |
| 2187 | static inline int break_deleg_wait(struct inode **delegated_inode) |
| 2188 | { |
| 2189 | BUG(); |
| 2190 | return 0; |
| 2191 | } |
| 2192 | |
Christoph Hellwig | 11afe9f | 2015-01-21 19:17:03 +0100 | [diff] [blame] | 2193 | static inline int break_layout(struct inode *inode, bool wait) |
| 2194 | { |
| 2195 | return 0; |
| 2196 | } |
| 2197 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 2198 | #endif /* CONFIG_FILE_LOCKING */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | |
| 2200 | /* fs/open.c */ |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 2201 | struct audit_names; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2202 | struct filename { |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 2203 | const char *name; /* pointer to actual string */ |
| 2204 | const __user char *uptr; /* original userland pointer */ |
| 2205 | struct audit_names *aname; |
Paul Moore | 55422d0 | 2015-01-22 00:00:23 -0500 | [diff] [blame] | 2206 | int refcnt; |
Al Viro | fd2f7cb | 2015-02-22 20:07:13 -0500 | [diff] [blame] | 2207 | const char iname[]; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2208 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 2210 | extern long vfs_truncate(struct path *, loff_t); |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 2211 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
| 2212 | struct file *filp); |
Anna Schumaker | 72c72bd | 2014-11-07 14:44:25 -0500 | [diff] [blame] | 2213 | extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 2214 | loff_t len); |
Jason Uhlenkott | 8e8a140 | 2007-10-20 03:16:18 +0200 | [diff] [blame] | 2215 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 2216 | umode_t mode); |
Jeff Layton | 669abf4 | 2012-10-10 16:43:10 -0400 | [diff] [blame] | 2217 | extern struct file *file_open_name(struct filename *, int, umode_t); |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 2218 | extern struct file *filp_open(const char *, int, umode_t); |
Al Viro | 73d049a | 2011-03-11 12:08:24 -0500 | [diff] [blame] | 2219 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
| 2220 | const char *, int); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 2221 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | extern int filp_close(struct file *, fl_owner_t id); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2223 | |
David Drysdale | 51f39a1 | 2014-12-12 16:57:29 -0800 | [diff] [blame] | 2224 | extern struct filename *getname_flags(const char __user *, int, int *); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2225 | extern struct filename *getname(const char __user *); |
Linus Torvalds | c4ad8f9 | 2014-02-05 12:54:53 -0800 | [diff] [blame] | 2226 | extern struct filename *getname_kernel(const char *); |
Paul Moore | 55422d0 | 2015-01-22 00:00:23 -0500 | [diff] [blame] | 2227 | extern void putname(struct filename *name); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2228 | |
Al Viro | 4723768 | 2012-06-10 05:01:45 -0400 | [diff] [blame] | 2229 | enum { |
| 2230 | FILE_CREATED = 1, |
| 2231 | FILE_OPENED = 2 |
| 2232 | }; |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 2233 | extern int finish_open(struct file *file, struct dentry *dentry, |
| 2234 | int (*open)(struct inode *, struct file *), |
| 2235 | int *opened); |
Al Viro | e45198a | 2012-06-10 06:48:09 -0400 | [diff] [blame] | 2236 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 2238 | /* fs/ioctl.c */ |
| 2239 | |
| 2240 | extern int ioctl_preallocate(struct file *filp, void __user *argp); |
| 2241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | /* fs/dcache.c */ |
| 2243 | extern void __init vfs_caches_init_early(void); |
Mel Gorman | 4248b0d | 2015-08-06 15:46:20 -0700 | [diff] [blame] | 2244 | extern void __init vfs_caches_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | |
Christoph Lameter | b86c089 | 2006-12-06 20:32:57 -0800 | [diff] [blame] | 2246 | extern struct kmem_cache *names_cachep; |
| 2247 | |
Jeff Layton | a608ca2 | 2012-10-10 15:25:26 -0400 | [diff] [blame] | 2248 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
Vegard Nossum | 3446a8a | 2009-05-16 11:22:14 +0200 | [diff] [blame] | 2249 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2251 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | extern int register_blkdev(unsigned int, const char *); |
Akinobu Mita | f448024 | 2007-07-17 04:03:47 -0700 | [diff] [blame] | 2253 | extern void unregister_blkdev(unsigned int, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2254 | extern struct block_device *bdget(dev_t); |
Alan Jenkins | dddac6a | 2009-07-29 21:07:55 +0200 | [diff] [blame] | 2255 | extern struct block_device *bdgrab(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | extern void bd_set_size(struct block_device *, loff_t size); |
| 2257 | extern void bd_forget(struct inode *inode); |
| 2258 | extern void bdput(struct block_device *); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2259 | extern void invalidate_bdev(struct block_device *); |
Jan Kara | 5c0d6b6 | 2012-07-03 16:45:31 +0200 | [diff] [blame] | 2260 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2261 | extern int sync_blockdev(struct block_device *bdev); |
Al Viro | ff01bb4 | 2011-09-16 02:31:11 -0400 | [diff] [blame] | 2262 | extern void kill_bdev(struct block_device *); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2263 | extern struct super_block *freeze_bdev(struct block_device *); |
Eric Sandeen | c2d7543 | 2009-03-31 15:23:46 -0700 | [diff] [blame] | 2264 | extern void emergency_thaw_all(void); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2265 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
| 2266 | extern int fsync_bdev(struct block_device *); |
Tejun Heo | a212b10 | 2015-05-22 17:13:33 -0400 | [diff] [blame] | 2267 | |
| 2268 | extern struct super_block *blockdev_superblock; |
| 2269 | |
| 2270 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
| 2271 | { |
| 2272 | return sb == blockdev_superblock; |
| 2273 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2274 | #else |
| 2275 | static inline void bd_forget(struct inode *inode) {} |
Al Viro | 47e4491 | 2009-04-01 07:07:16 -0400 | [diff] [blame] | 2276 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
Al Viro | ff01bb4 | 2011-09-16 02:31:11 -0400 | [diff] [blame] | 2277 | static inline void kill_bdev(struct block_device *bdev) {} |
Al Viro | 47e4491 | 2009-04-01 07:07:16 -0400 | [diff] [blame] | 2278 | static inline void invalidate_bdev(struct block_device *bdev) {} |
| 2279 | |
| 2280 | static inline struct super_block *freeze_bdev(struct block_device *sb) |
| 2281 | { |
| 2282 | return NULL; |
| 2283 | } |
| 2284 | |
| 2285 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
| 2286 | { |
| 2287 | return 0; |
| 2288 | } |
Jan Kara | 5c0d6b6 | 2012-07-03 16:45:31 +0200 | [diff] [blame] | 2289 | |
| 2290 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) |
| 2291 | { |
| 2292 | } |
Jan Kara | a885599 | 2013-07-09 22:36:45 +0800 | [diff] [blame] | 2293 | |
Yaowei Bai | 3e004ee | 2015-11-17 14:40:09 +0800 | [diff] [blame] | 2294 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
Jan Kara | a885599 | 2013-07-09 22:36:45 +0800 | [diff] [blame] | 2295 | { |
Yaowei Bai | 3e004ee | 2015-11-17 14:40:09 +0800 | [diff] [blame] | 2296 | return false; |
Jan Kara | a885599 | 2013-07-09 22:36:45 +0800 | [diff] [blame] | 2297 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2298 | #endif |
Jan Kara | 60b0680 | 2009-04-27 16:43:53 +0200 | [diff] [blame] | 2299 | extern int sync_filesystem(struct super_block *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2300 | extern const struct file_operations def_blk_fops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2301 | extern const struct file_operations def_chr_fops; |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2302 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
Al Viro | 56b26ad | 2008-09-19 03:17:36 -0400 | [diff] [blame] | 2304 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2306 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 2307 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
| 2308 | void *holder); |
| 2309 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, |
| 2310 | void *holder); |
Al Viro | 4385bab | 2013-05-05 22:11:03 -0400 | [diff] [blame] | 2311 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
Jarod Wilson | be32417 | 2015-05-06 12:26:22 +0800 | [diff] [blame] | 2312 | extern int __blkdev_reread_part(struct block_device *bdev); |
| 2313 | extern int blkdev_reread_part(struct block_device *bdev); |
| 2314 | |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2315 | #ifdef CONFIG_SYSFS |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2316 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 2317 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
| 2318 | struct gendisk *disk); |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2319 | #else |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2320 | static inline int bd_link_disk_holder(struct block_device *bdev, |
| 2321 | struct gendisk *disk) |
| 2322 | { |
| 2323 | return 0; |
| 2324 | } |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 2325 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
| 2326 | struct gendisk *disk) |
| 2327 | { |
| 2328 | } |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2329 | #endif |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2330 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | |
| 2332 | /* fs/char_dev.c */ |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2333 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
| 2335 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
Tejun Heo | 1905b1b | 2009-08-06 18:13:23 +0900 | [diff] [blame] | 2336 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
| 2337 | unsigned int count, const char *name, |
| 2338 | const struct file_operations *fops); |
| 2339 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
| 2340 | unsigned int count, const char *name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | extern void unregister_chrdev_region(dev_t, unsigned); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2342 | extern void chrdev_show(struct seq_file *,off_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | |
Tejun Heo | 1905b1b | 2009-08-06 18:13:23 +0900 | [diff] [blame] | 2344 | static inline int register_chrdev(unsigned int major, const char *name, |
| 2345 | const struct file_operations *fops) |
| 2346 | { |
| 2347 | return __register_chrdev(major, 0, 256, name, fops); |
| 2348 | } |
| 2349 | |
| 2350 | static inline void unregister_chrdev(unsigned int major, const char *name) |
| 2351 | { |
| 2352 | __unregister_chrdev(major, 0, 256, name); |
| 2353 | } |
| 2354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | /* fs/block_dev.c */ |
| 2356 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 2357 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2358 | |
| 2359 | #ifdef CONFIG_BLOCK |
| 2360 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | extern const char *__bdevname(dev_t, char *buffer); |
| 2362 | extern const char *bdevname(struct block_device *bdev, char *buffer); |
| 2363 | extern struct block_device *lookup_bdev(const char *); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2364 | extern void blkdev_show(struct seq_file *,off_t); |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 2365 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2366 | #else |
| 2367 | #define BLKDEV_MAJOR_HASH_SIZE 0 |
| 2368 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | |
| 2370 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
| 2371 | |
| 2372 | /* Invalid inode operations -- fs/bad_inode.c */ |
| 2373 | extern void make_bad_inode(struct inode *); |
| 2374 | extern int is_bad_inode(struct inode *); |
| 2375 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2376 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | /* |
| 2378 | * return READ, READA, or WRITE |
| 2379 | */ |
| 2380 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
| 2381 | |
| 2382 | /* |
| 2383 | * return data direction, READ or WRITE |
| 2384 | */ |
| 2385 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
| 2386 | |
Andrew Patterson | c3279d1 | 2008-09-04 14:27:25 -0600 | [diff] [blame] | 2387 | extern void check_disk_size_change(struct gendisk *disk, |
| 2388 | struct block_device *bdev); |
Andrew Patterson | 0c002c2 | 2008-09-04 14:27:20 -0600 | [diff] [blame] | 2389 | extern int revalidate_disk(struct gendisk *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | extern int check_disk_change(struct block_device *); |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 2391 | extern int __invalidate_device(struct block_device *, bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | extern int invalidate_partition(struct gendisk *, int); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2393 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
| 2395 | pgoff_t start, pgoff_t end); |
Anton Altaparmakov | 54bc485 | 2007-02-10 01:45:38 -0800 | [diff] [blame] | 2396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2397 | static inline void invalidate_remote_inode(struct inode *inode) |
| 2398 | { |
| 2399 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 2400 | S_ISLNK(inode->i_mode)) |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 2401 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | } |
| 2403 | extern int invalidate_inode_pages2(struct address_space *mapping); |
| 2404 | extern int invalidate_inode_pages2_range(struct address_space *mapping, |
| 2405 | pgoff_t start, pgoff_t end); |
| 2406 | extern int write_inode_now(struct inode *, int); |
| 2407 | extern int filemap_fdatawrite(struct address_space *); |
| 2408 | extern int filemap_flush(struct address_space *); |
| 2409 | extern int filemap_fdatawait(struct address_space *); |
Junichi Nomura | aa750fd | 2015-11-05 18:47:23 -0800 | [diff] [blame] | 2410 | extern void filemap_fdatawait_keep_errors(struct address_space *); |
Jan Kara | d3bccb6f | 2009-08-17 19:30:27 +0200 | [diff] [blame] | 2411 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
| 2412 | loff_t lend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | extern int filemap_write_and_wait(struct address_space *mapping); |
| 2414 | extern int filemap_write_and_wait_range(struct address_space *mapping, |
| 2415 | loff_t lstart, loff_t lend); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2416 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
| 2417 | loff_t start, loff_t end, int sync_mode); |
Jan Kara | f4c0a0f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2418 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
| 2419 | loff_t start, loff_t end); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2420 | |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 2421 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
| 2422 | int datasync); |
| 2423 | extern int vfs_fsync(struct file *file, int datasync); |
Al Viro | d311d79 | 2014-02-09 15:18:09 -0500 | [diff] [blame] | 2424 | static inline int generic_write_sync(struct file *file, loff_t pos, loff_t count) |
| 2425 | { |
| 2426 | if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host)) |
| 2427 | return 0; |
| 2428 | return vfs_fsync_range(file, pos, pos + count - 1, |
| 2429 | (file->f_flags & __O_SYNC) ? 0 : 1); |
| 2430 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | extern void emergency_sync(void); |
| 2432 | extern void emergency_remount(void); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2433 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | extern sector_t bmap(struct inode *, sector_t); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2435 | #endif |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 2436 | extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2437 | extern int inode_permission(struct inode *, int); |
Miklos Szeredi | bd5d085 | 2014-10-24 00:14:35 +0200 | [diff] [blame] | 2438 | extern int __inode_permission(struct inode *, int); |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 2439 | extern int generic_permission(struct inode *, int); |
Miklos Szeredi | cbdf35b | 2014-10-24 00:14:36 +0200 | [diff] [blame] | 2440 | extern int __check_sticky(struct inode *dir, struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | |
Miklos Szeredi | f696a36 | 2008-07-31 13:41:58 +0200 | [diff] [blame] | 2442 | static inline bool execute_ok(struct inode *inode) |
| 2443 | { |
| 2444 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
| 2445 | } |
| 2446 | |
Al Viro | 8d71db4 | 2013-03-19 21:01:03 -0400 | [diff] [blame] | 2447 | static inline void file_start_write(struct file *file) |
| 2448 | { |
| 2449 | if (!S_ISREG(file_inode(file)->i_mode)) |
| 2450 | return; |
| 2451 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); |
| 2452 | } |
| 2453 | |
Jan Kara | 5ae98f1 | 2013-05-04 00:11:23 +0200 | [diff] [blame] | 2454 | static inline bool file_start_write_trylock(struct file *file) |
| 2455 | { |
| 2456 | if (!S_ISREG(file_inode(file)->i_mode)) |
| 2457 | return true; |
| 2458 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); |
| 2459 | } |
| 2460 | |
Al Viro | 8d71db4 | 2013-03-19 21:01:03 -0400 | [diff] [blame] | 2461 | static inline void file_end_write(struct file *file) |
| 2462 | { |
| 2463 | if (!S_ISREG(file_inode(file)->i_mode)) |
| 2464 | return; |
| 2465 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); |
| 2466 | } |
| 2467 | |
Al Viro | 07b8ce1 | 2011-06-20 10:52:57 -0400 | [diff] [blame] | 2468 | /* |
| 2469 | * get_write_access() gets write permission for a file. |
| 2470 | * put_write_access() releases this write permission. |
| 2471 | * This is used for regular files. |
| 2472 | * We cannot support write (and maybe mmap read-write shared) accesses and |
| 2473 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode |
| 2474 | * can have the following values: |
| 2475 | * 0: no writers, no VM_DENYWRITE mappings |
| 2476 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist |
| 2477 | * > 0: (i_writecount) users are writing to the file. |
| 2478 | * |
| 2479 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe |
| 2480 | * except for the cases where we don't hold i_writecount yet. Then we need to |
| 2481 | * use {get,deny}_write_access() - these functions check the sign and refuse |
| 2482 | * to do the change if sign is wrong. |
| 2483 | */ |
| 2484 | static inline int get_write_access(struct inode *inode) |
| 2485 | { |
| 2486 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; |
| 2487 | } |
| 2488 | static inline int deny_write_access(struct file *file) |
| 2489 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2490 | struct inode *inode = file_inode(file); |
Al Viro | 07b8ce1 | 2011-06-20 10:52:57 -0400 | [diff] [blame] | 2491 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
| 2492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | static inline void put_write_access(struct inode * inode) |
| 2494 | { |
| 2495 | atomic_dec(&inode->i_writecount); |
| 2496 | } |
| 2497 | static inline void allow_write_access(struct file *file) |
| 2498 | { |
| 2499 | if (file) |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2500 | atomic_inc(&file_inode(file)->i_writecount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | } |
David Howells | f1fe29b | 2013-09-27 11:20:03 +0100 | [diff] [blame] | 2502 | static inline bool inode_is_open_for_write(const struct inode *inode) |
| 2503 | { |
| 2504 | return atomic_read(&inode->i_writecount) > 0; |
| 2505 | } |
| 2506 | |
Mimi Zohar | a5c96eb | 2010-11-02 10:11:37 -0400 | [diff] [blame] | 2507 | #ifdef CONFIG_IMA |
| 2508 | static inline void i_readcount_dec(struct inode *inode) |
| 2509 | { |
| 2510 | BUG_ON(!atomic_read(&inode->i_readcount)); |
| 2511 | atomic_dec(&inode->i_readcount); |
| 2512 | } |
| 2513 | static inline void i_readcount_inc(struct inode *inode) |
| 2514 | { |
| 2515 | atomic_inc(&inode->i_readcount); |
| 2516 | } |
| 2517 | #else |
| 2518 | static inline void i_readcount_dec(struct inode *inode) |
| 2519 | { |
| 2520 | return; |
| 2521 | } |
| 2522 | static inline void i_readcount_inc(struct inode *inode) |
| 2523 | { |
| 2524 | return; |
| 2525 | } |
| 2526 | #endif |
Ulrich Drepper | ed8cae8 | 2008-07-23 21:29:30 -0700 | [diff] [blame] | 2527 | extern int do_pipe_flags(int *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | |
Mimi Zohar | 6777d77 | 2009-08-21 14:32:48 -0400 | [diff] [blame] | 2529 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
Al Viro | 7bb307e | 2013-02-23 14:51:48 -0500 | [diff] [blame] | 2530 | extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t); |
Al Viro | ed44724 | 2014-04-19 14:37:20 -0400 | [diff] [blame] | 2531 | extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2532 | extern struct file * open_exec(const char *); |
| 2533 | |
| 2534 | /* fs/dcache.c -- generic fs support functions */ |
| 2535 | extern int is_subdir(struct dentry *, struct dentry *); |
Yaowei Bai | 25ab4c9 | 2015-11-17 14:40:10 +0800 | [diff] [blame^] | 2536 | extern bool path_is_under(struct path *, struct path *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | |
Miklos Szeredi | 9bf39ab | 2015-06-19 10:29:13 +0200 | [diff] [blame] | 2538 | extern char *file_path(struct file *, char *, int); |
| 2539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | #include <linux/err.h> |
| 2541 | |
| 2542 | /* needed for stackable file system support */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2543 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2544 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2545 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2546 | |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 2547 | extern int inode_init_always(struct super_block *, struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2548 | extern void inode_init_once(struct inode *); |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 2549 | extern void address_space_init_once(struct address_space *mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2550 | extern struct inode * igrab(struct inode *); |
| 2551 | extern ino_t iunique(struct super_block *, ino_t); |
| 2552 | extern int inode_needs_sync(struct inode *inode); |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 2553 | extern int generic_delete_inode(struct inode *inode); |
Al Viro | 9bcb4b7 | 2012-02-12 19:43:17 -0500 | [diff] [blame] | 2554 | static inline int generic_drop_inode(struct inode *inode) |
| 2555 | { |
| 2556 | return !inode->i_nlink || inode_unhashed(inode); |
| 2557 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2558 | |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 2559 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
| 2560 | unsigned long hashval, int (*test)(struct inode *, void *), |
| 2561 | void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
| 2563 | int (*test)(struct inode *, void *), void *data); |
| 2564 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
| 2565 | |
| 2566 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
| 2567 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
Theodore Ts'o | fe032c4 | 2015-02-02 00:37:01 -0500 | [diff] [blame] | 2568 | extern struct inode *find_inode_nowait(struct super_block *, |
| 2569 | unsigned long, |
| 2570 | int (*match)(struct inode *, |
| 2571 | unsigned long, void *), |
| 2572 | void *data); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 2573 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
| 2574 | extern int insert_inode_locked(struct inode *); |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 2575 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 2576 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); |
| 2577 | #else |
| 2578 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; |
| 2579 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | extern void unlock_new_inode(struct inode *); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 2581 | extern unsigned int get_next_ino(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2582 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | extern void __iget(struct inode * inode); |
David Howells | b46980f | 2008-02-07 00:15:27 -0800 | [diff] [blame] | 2584 | extern void iget_failed(struct inode *); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 2585 | extern void clear_inode(struct inode *); |
Christoph Hellwig | 2e00c97 | 2009-08-07 14:38:29 -0300 | [diff] [blame] | 2586 | extern void __destroy_inode(struct inode *); |
Eric Dumazet | a209dfc | 2011-07-26 11:36:34 +0200 | [diff] [blame] | 2587 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
| 2588 | extern struct inode *new_inode(struct super_block *sb); |
Nick Piggin | ff0c7d1 | 2011-01-07 17:49:50 +1100 | [diff] [blame] | 2589 | extern void free_inode_nonrcu(struct inode *inode); |
Jens Axboe | 01de85e | 2006-10-17 19:50:36 +0200 | [diff] [blame] | 2590 | extern int should_remove_suid(struct dentry *); |
Jan Kara | 5fa8e0a | 2015-05-21 16:05:53 +0200 | [diff] [blame] | 2591 | extern int file_remove_privs(struct file *); |
Jan Kara | 45f147a | 2015-05-21 16:05:55 +0200 | [diff] [blame] | 2592 | extern int dentry_needs_remove_privs(struct dentry *dentry); |
| 2593 | static inline int file_needs_remove_privs(struct file *file) |
| 2594 | { |
| 2595 | return dentry_needs_remove_privs(file->f_path.dentry); |
| 2596 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2597 | |
| 2598 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 2599 | static inline void insert_inode_hash(struct inode *inode) |
| 2600 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | __insert_inode_hash(inode, inode->i_ino); |
| 2602 | } |
Eric Dumazet | f2ee7ab | 2011-07-28 06:41:09 +0200 | [diff] [blame] | 2603 | |
| 2604 | extern void __remove_inode_hash(struct inode *); |
| 2605 | static inline void remove_inode_hash(struct inode *inode) |
| 2606 | { |
Josef Bacik | cbedaac | 2015-03-12 08:19:11 -0400 | [diff] [blame] | 2607 | if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
Eric Dumazet | f2ee7ab | 2011-07-28 06:41:09 +0200 | [diff] [blame] | 2608 | __remove_inode_hash(inode); |
| 2609 | } |
| 2610 | |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 2611 | extern void inode_sb_list_add(struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2612 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2613 | #ifdef CONFIG_BLOCK |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 2614 | extern blk_qc_t submit_bio(int, struct bio *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | extern int bdev_read_only(struct block_device *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2616 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | extern int set_blocksize(struct block_device *, int); |
| 2618 | extern int sb_set_blocksize(struct super_block *, int); |
| 2619 | extern int sb_min_blocksize(struct super_block *, int); |
| 2620 | |
| 2621 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
| 2622 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 2623 | extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); |
Al Viro | ed978a8 | 2014-03-05 22:53:04 -0500 | [diff] [blame] | 2624 | extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); |
Al Viro | 8174202 | 2014-04-03 03:17:43 -0400 | [diff] [blame] | 2625 | extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); |
Al Viro | 8174202 | 2014-04-03 03:17:43 -0400 | [diff] [blame] | 2626 | extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); |
Al Viro | 0c94933 | 2014-03-22 06:51:37 -0400 | [diff] [blame] | 2627 | extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *, loff_t); |
Al Viro | 3b93f91 | 2014-02-11 21:34:08 -0500 | [diff] [blame] | 2628 | extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2629 | |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 2630 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos); |
| 2631 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos); |
| 2632 | |
Christoph Hellwig | eef9938 | 2009-08-20 17:43:41 +0200 | [diff] [blame] | 2633 | /* fs/block_dev.c */ |
David Jeffery | b2de525 | 2014-09-29 10:21:10 -0400 | [diff] [blame] | 2634 | extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); |
Al Viro | 1456c0a | 2014-04-03 03:21:50 -0400 | [diff] [blame] | 2635 | extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2636 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
| 2637 | int datasync); |
Al Viro | ff01bb4 | 2011-09-16 02:31:11 -0400 | [diff] [blame] | 2638 | extern void block_sync_page(struct page *page); |
Christoph Hellwig | eef9938 | 2009-08-20 17:43:41 +0200 | [diff] [blame] | 2639 | |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2640 | /* fs/splice.c */ |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2641 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2642 | struct pipe_inode_info *, size_t, unsigned int); |
Miklos Szeredi | 6818173 | 2009-05-07 15:37:36 +0200 | [diff] [blame] | 2643 | extern ssize_t default_file_splice_read(struct file *, loff_t *, |
| 2644 | struct pipe_inode_info *, size_t, unsigned int); |
Al Viro | 8d02076 | 2014-04-05 04:27:08 -0400 | [diff] [blame] | 2645 | extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2646 | struct file *, loff_t *, size_t, unsigned int); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2647 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2648 | struct file *out, loff_t *, size_t len, unsigned int flags); |
Miklos Szeredi | 1c11859 | 2014-10-24 00:14:35 +0200 | [diff] [blame] | 2649 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
| 2650 | loff_t *opos, size_t len, unsigned int flags); |
| 2651 | |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2653 | extern void |
| 2654 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2655 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
| 2656 | extern loff_t no_llseek(struct file *file, loff_t offset, int whence); |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 2657 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2658 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 2659 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2660 | int whence, loff_t maxsize, loff_t eof); |
Al Viro | 1bf9d14 | 2013-06-16 20:27:42 +0400 | [diff] [blame] | 2661 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
| 2662 | int whence, loff_t size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | extern int generic_file_open(struct inode * inode, struct file * filp); |
| 2664 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
| 2665 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2666 | #ifdef CONFIG_BLOCK |
Josef Bacik | facd07b | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 2667 | typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
| 2668 | loff_t file_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2669 | |
| 2670 | enum { |
Christoph Hellwig | 1e431f5 | 2009-11-03 16:44:53 +0100 | [diff] [blame] | 2671 | /* need locking between buffered and direct access */ |
| 2672 | DIO_LOCKING = 0x01, |
| 2673 | |
| 2674 | /* filesystem does not support filling holes */ |
| 2675 | DIO_SKIP_HOLES = 0x02, |
Christoph Hellwig | 6039257 | 2014-02-10 10:27:11 +1100 | [diff] [blame] | 2676 | |
| 2677 | /* filesystem can handle aio writes beyond i_size */ |
| 2678 | DIO_ASYNC_EXTEND = 0x04, |
Jens Axboe | fe0f07d | 2015-04-15 17:05:48 -0600 | [diff] [blame] | 2679 | |
| 2680 | /* inode/fs/bdev does not need truncate protection */ |
| 2681 | DIO_SKIP_DIO_COUNT = 0x08, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2682 | }; |
| 2683 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 2684 | void dio_end_io(struct bio *bio, int error); |
npiggin@suse.de | 7bb46a6 | 2010-05-27 01:05:33 +1000 | [diff] [blame] | 2685 | |
Omar Sandoval | 17f8c84 | 2015-03-16 04:33:50 -0700 | [diff] [blame] | 2686 | ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, |
| 2687 | struct block_device *bdev, struct iov_iter *iter, |
| 2688 | loff_t offset, get_block_t get_block, |
| 2689 | dio_iodone_t end_io, dio_submit_t submit_io, |
| 2690 | int flags); |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 2691 | |
Omar Sandoval | 17f8c84 | 2015-03-16 04:33:50 -0700 | [diff] [blame] | 2692 | static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, |
| 2693 | struct inode *inode, |
| 2694 | struct iov_iter *iter, loff_t offset, |
| 2695 | get_block_t get_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | { |
Omar Sandoval | 17f8c84 | 2015-03-16 04:33:50 -0700 | [diff] [blame] | 2697 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
Al Viro | 31b1403 | 2014-03-05 01:33:16 -0500 | [diff] [blame] | 2698 | offset, get_block, NULL, NULL, |
Christoph Hellwig | 1e431f5 | 2009-11-03 16:44:53 +0100 | [diff] [blame] | 2699 | DIO_LOCKING | DIO_SKIP_HOLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2700 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2701 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | |
Trond Myklebust | 1d59d61 | 2012-05-31 12:22:33 -0400 | [diff] [blame] | 2703 | void inode_dio_wait(struct inode *inode); |
Jens Axboe | fe0f07d | 2015-04-15 17:05:48 -0600 | [diff] [blame] | 2704 | |
| 2705 | /* |
| 2706 | * inode_dio_begin - signal start of a direct I/O requests |
| 2707 | * @inode: inode the direct I/O happens on |
| 2708 | * |
| 2709 | * This is called once we've finished processing a direct I/O request, |
| 2710 | * and is used to wake up callers waiting for direct I/O to be quiesced. |
| 2711 | */ |
| 2712 | static inline void inode_dio_begin(struct inode *inode) |
| 2713 | { |
| 2714 | atomic_inc(&inode->i_dio_count); |
| 2715 | } |
| 2716 | |
| 2717 | /* |
| 2718 | * inode_dio_end - signal finish of a direct I/O requests |
| 2719 | * @inode: inode the direct I/O happens on |
| 2720 | * |
| 2721 | * This is called once we've finished processing a direct I/O request, |
| 2722 | * and is used to wake up callers waiting for direct I/O to be quiesced. |
| 2723 | */ |
| 2724 | static inline void inode_dio_end(struct inode *inode) |
| 2725 | { |
| 2726 | if (atomic_dec_and_test(&inode->i_dio_count)) |
| 2727 | wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); |
| 2728 | } |
Trond Myklebust | 1d59d61 | 2012-05-31 12:22:33 -0400 | [diff] [blame] | 2729 | |
Theodore Ts'o | 5f16f32 | 2014-03-24 14:43:12 -0400 | [diff] [blame] | 2730 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
| 2731 | unsigned int mask); |
| 2732 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2733 | extern const struct file_operations generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2734 | |
| 2735 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
| 2736 | |
Al Viro | 5d826c8 | 2014-03-14 13:42:45 -0400 | [diff] [blame] | 2737 | extern int readlink_copy(char __user *, int, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2738 | extern int page_readlink(struct dentry *, char __user *, int); |
Al Viro | 6e77137 | 2015-05-02 13:37:52 -0400 | [diff] [blame] | 2739 | extern const char *page_follow_link_light(struct dentry *, void **); |
Al Viro | 5f2c417 | 2015-05-07 11:14:26 -0400 | [diff] [blame] | 2740 | extern void page_put_link(struct inode *, void *); |
Kirill Korotaev | 0adb25d | 2006-03-11 03:27:13 -0800 | [diff] [blame] | 2741 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 2742 | int nofs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2744 | extern const struct inode_operations page_symlink_inode_operations; |
Al Viro | 5f2c417 | 2015-05-07 11:14:26 -0400 | [diff] [blame] | 2745 | extern void kfree_put_link(struct inode *, void *); |
Al Viro | ecc087f | 2015-05-07 11:19:14 -0400 | [diff] [blame] | 2746 | extern void free_page_put_link(struct inode *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | extern int generic_readlink(struct dentry *, char __user *, int); |
| 2748 | extern void generic_fillattr(struct inode *, struct kstat *); |
J. Bruce Fields | b7a6ec5 | 2013-10-02 17:01:18 -0400 | [diff] [blame] | 2749 | int vfs_getattr_nosec(struct path *path, struct kstat *stat); |
Al Viro | 3dadecc | 2013-01-24 02:18:08 -0500 | [diff] [blame] | 2750 | extern int vfs_getattr(struct path *, struct kstat *); |
Dmitry Monakhov | b462707 | 2009-12-14 15:21:12 +0300 | [diff] [blame] | 2751 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2752 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
Jan Kara | 1c8924e | 2013-08-17 09:32:32 -0400 | [diff] [blame] | 2753 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
| 2755 | loff_t inode_get_bytes(struct inode *inode); |
| 2756 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
Al Viro | 6e77137 | 2015-05-02 13:37:52 -0400 | [diff] [blame] | 2757 | const char *simple_follow_link(struct dentry *, void **); |
Al Viro | 61ba64f | 2015-05-02 09:54:06 -0400 | [diff] [blame] | 2758 | extern const struct inode_operations simple_symlink_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 2760 | extern int iterate_dir(struct file *, struct dir_context *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2761 | |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 2762 | extern int vfs_stat(const char __user *, struct kstat *); |
| 2763 | extern int vfs_lstat(const char __user *, struct kstat *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2764 | extern int vfs_fstat(unsigned int, struct kstat *); |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 2765 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | |
Erez Zadok | deb21db | 2008-02-07 00:13:25 -0800 | [diff] [blame] | 2767 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
| 2768 | unsigned long arg); |
Steven Whitehouse | e9079cc | 2008-10-14 14:43:29 +0100 | [diff] [blame] | 2769 | extern int __generic_block_fiemap(struct inode *inode, |
Josef Bacik | 3a3076f | 2010-04-23 12:17:17 -0400 | [diff] [blame] | 2770 | struct fiemap_extent_info *fieinfo, |
| 2771 | loff_t start, loff_t len, |
| 2772 | get_block_t *get_block); |
Josef Bacik | 68c9d70 | 2008-10-03 17:32:43 -0400 | [diff] [blame] | 2773 | extern int generic_block_fiemap(struct inode *inode, |
| 2774 | struct fiemap_extent_info *fieinfo, u64 start, |
| 2775 | u64 len, get_block_t *get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2776 | |
Miklos Szeredi | c18479f | 2007-10-18 23:39:11 -0700 | [diff] [blame] | 2777 | extern void get_filesystem(struct file_system_type *fs); |
| 2778 | extern void put_filesystem(struct file_system_type *fs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2779 | extern struct file_system_type *get_fs_type(const char *name); |
| 2780 | extern struct super_block *get_super(struct block_device *); |
Jan Kara | 6b6dc83 | 2012-02-10 11:03:00 +0100 | [diff] [blame] | 2781 | extern struct super_block *get_super_thawed(struct block_device *); |
Christoph Hellwig | 4504230 | 2009-08-03 23:28:35 +0200 | [diff] [blame] | 2782 | extern struct super_block *get_active_super(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | extern void drop_super(struct super_block *sb); |
Al Viro | 01a05b3 | 2010-03-23 06:06:58 -0400 | [diff] [blame] | 2784 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
Al Viro | 43e15cd | 2011-06-03 20:16:57 -0400 | [diff] [blame] | 2785 | extern void iterate_supers_type(struct file_system_type *, |
| 2786 | void (*)(struct super_block *, void *), void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | |
| 2788 | extern int dcache_dir_open(struct inode *, struct file *); |
| 2789 | extern int dcache_dir_close(struct inode *, struct file *); |
| 2790 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
Al Viro | 5f99f4e | 2013-05-15 20:23:06 -0400 | [diff] [blame] | 2791 | extern int dcache_readdir(struct file *, struct dir_context *); |
npiggin@suse.de | 7bb46a6 | 2010-05-27 01:05:33 +1000 | [diff] [blame] | 2792 | extern int simple_setattr(struct dentry *, struct iattr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2794 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
Stephen Boyd | 20955e8 | 2012-04-05 14:25:09 -0700 | [diff] [blame] | 2795 | extern int simple_open(struct inode *inode, struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2796 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
| 2797 | extern int simple_unlink(struct inode *, struct dentry *); |
| 2798 | extern int simple_rmdir(struct inode *, struct dentry *); |
| 2799 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2800 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | extern int simple_empty(struct dentry *); |
| 2802 | extern int simple_readpage(struct file *file, struct page *page); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 2803 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
| 2804 | loff_t pos, unsigned len, unsigned flags, |
| 2805 | struct page **pagep, void **fsdata); |
| 2806 | extern int simple_write_end(struct file *file, struct address_space *mapping, |
| 2807 | loff_t pos, unsigned len, unsigned copied, |
| 2808 | struct page *page, void *fsdata); |
Al Viro | b26d4cd | 2013-10-25 18:47:37 -0400 | [diff] [blame] | 2809 | extern int always_delete_dentry(const struct dentry *); |
Al Viro | 6987843 | 2013-10-02 22:35:11 -0400 | [diff] [blame] | 2810 | extern struct inode *alloc_anon_inode(struct super_block *); |
Jeff Layton | e6f5c78 | 2014-08-22 10:40:25 -0400 | [diff] [blame] | 2811 | extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
Al Viro | b26d4cd | 2013-10-25 18:47:37 -0400 | [diff] [blame] | 2812 | extern const struct dentry_operations simple_dentry_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2813 | |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 2814 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2815 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2816 | extern const struct file_operations simple_dir_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2817 | extern const struct inode_operations simple_dir_inode_operations; |
Eric W. Biederman | fbabfd0 | 2015-05-09 15:54:49 -0500 | [diff] [blame] | 2818 | extern void make_empty_dir_inode(struct inode *inode); |
| 2819 | extern bool is_empty_dir_inode(struct inode *inode); |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2820 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2821 | struct dentry *d_alloc_name(struct dentry *, const char *); |
Roberto Sassu | 7d683a0 | 2010-06-03 11:58:28 +0200 | [diff] [blame] | 2822 | extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 2823 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
| 2825 | |
Akinobu Mita | 93b0711 | 2008-06-05 22:46:21 -0700 | [diff] [blame] | 2826 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
| 2827 | loff_t *ppos, const void *from, size_t available); |
Jiri Slaby | 6a727b4 | 2010-05-01 23:51:22 +0200 | [diff] [blame] | 2828 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
| 2829 | const void __user *from, size_t count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2830 | |
Fabian Frederick | ac13a82 | 2014-06-04 16:06:27 -0700 | [diff] [blame] | 2831 | extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2832 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
Al Viro | d5aacad | 2009-06-07 14:56:44 -0400 | [diff] [blame] | 2833 | |
Patrick J. LoPresti | 30ca22c | 2010-07-22 15:03:41 -0700 | [diff] [blame] | 2834 | extern int generic_check_addressable(unsigned, u64); |
| 2835 | |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2836 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 2837 | extern int buffer_migrate_page(struct address_space *, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 2838 | struct page *, struct page *, |
| 2839 | enum migrate_mode); |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2840 | #else |
| 2841 | #define buffer_migrate_page NULL |
| 2842 | #endif |
| 2843 | |
npiggin@suse.de | 25d9e2d | 2009-08-21 02:35:05 +1000 | [diff] [blame] | 2844 | extern int inode_change_ok(const struct inode *, struct iattr *); |
| 2845 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
Christoph Hellwig | 6a1a90a | 2010-06-04 11:30:00 +0200 | [diff] [blame] | 2846 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2847 | |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 2848 | extern int file_update_time(struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2849 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 2850 | extern int generic_show_options(struct seq_file *m, struct dentry *root); |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 2851 | extern void save_mount_options(struct super_block *sb, char *options); |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 2852 | extern void replace_mount_options(struct super_block *sb, char *options); |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 2853 | |
Matthew Wilcox | d475c63 | 2015-02-16 15:58:56 -0800 | [diff] [blame] | 2854 | static inline bool io_is_direct(struct file *filp) |
| 2855 | { |
| 2856 | return (filp->f_flags & O_DIRECT) || IS_DAX(file_inode(filp)); |
| 2857 | } |
| 2858 | |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 2859 | static inline int iocb_flags(struct file *file) |
| 2860 | { |
| 2861 | int res = 0; |
| 2862 | if (file->f_flags & O_APPEND) |
| 2863 | res |= IOCB_APPEND; |
| 2864 | if (io_is_direct(file)) |
| 2865 | res |= IOCB_DIRECT; |
| 2866 | return res; |
| 2867 | } |
| 2868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2869 | static inline ino_t parent_ino(struct dentry *dentry) |
| 2870 | { |
| 2871 | ino_t res; |
| 2872 | |
Nick Piggin | b5c84bf | 2011-01-07 17:49:38 +1100 | [diff] [blame] | 2873 | /* |
| 2874 | * Don't strictly need d_lock here? If the parent ino could change |
| 2875 | * then surely we'd have a deeper race in the caller? |
| 2876 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2877 | spin_lock(&dentry->d_lock); |
| 2878 | res = dentry->d_parent->d_inode->i_ino; |
| 2879 | spin_unlock(&dentry->d_lock); |
| 2880 | return res; |
| 2881 | } |
| 2882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2883 | /* Transaction based IO helpers */ |
| 2884 | |
| 2885 | /* |
| 2886 | * An argresp is stored in an allocated page and holds the |
| 2887 | * size of the argument or response, along with its content |
| 2888 | */ |
| 2889 | struct simple_transaction_argresp { |
| 2890 | ssize_t size; |
| 2891 | char data[0]; |
| 2892 | }; |
| 2893 | |
| 2894 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
| 2895 | |
| 2896 | char *simple_transaction_get(struct file *file, const char __user *buf, |
| 2897 | size_t size); |
| 2898 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
| 2899 | size_t size, loff_t *pos); |
| 2900 | int simple_transaction_release(struct inode *inode, struct file *file); |
| 2901 | |
Ingo Molnar | 76791ab | 2009-03-25 16:48:35 +0100 | [diff] [blame] | 2902 | void simple_transaction_set(struct file *file, size_t n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2904 | /* |
| 2905 | * simple attribute files |
| 2906 | * |
| 2907 | * These attributes behave similar to those in sysfs: |
| 2908 | * |
| 2909 | * Writing to an attribute immediately sets a value, an open file can be |
| 2910 | * written to multiple times. |
| 2911 | * |
| 2912 | * Reading from an attribute creates a buffer from the value that might get |
| 2913 | * read with multiple read calls. When the attribute has been read |
| 2914 | * completely, no further read calls are possible until the file is opened |
| 2915 | * again. |
| 2916 | * |
| 2917 | * All attributes contain a text representation of a numeric value |
| 2918 | * that are accessed with the get() and set() functions. |
| 2919 | */ |
| 2920 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| 2921 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
| 2922 | { \ |
| 2923 | __simple_attr_check_format(__fmt, 0ull); \ |
| 2924 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| 2925 | } \ |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2926 | static const struct file_operations __fops = { \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2927 | .owner = THIS_MODULE, \ |
| 2928 | .open = __fops ## _open, \ |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2929 | .release = simple_attr_release, \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2930 | .read = simple_attr_read, \ |
| 2931 | .write = simple_attr_write, \ |
Arnd Bergmann | 1ec5584 | 2010-08-15 21:50:52 +0200 | [diff] [blame] | 2932 | .llseek = generic_file_llseek, \ |
Joe Perches | 68be302 | 2014-08-06 16:08:45 -0700 | [diff] [blame] | 2933 | } |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2934 | |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2935 | static inline __printf(1, 2) |
| 2936 | void __simple_attr_check_format(const char *fmt, ...) |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2937 | { |
| 2938 | /* don't do anything, just let the compiler check the arguments; */ |
| 2939 | } |
| 2940 | |
| 2941 | int simple_attr_open(struct inode *inode, struct file *file, |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 2942 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2943 | const char *fmt); |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2944 | int simple_attr_release(struct inode *inode, struct file *file); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2945 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
| 2946 | size_t len, loff_t *ppos); |
| 2947 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| 2948 | size_t len, loff_t *ppos); |
| 2949 | |
Alexey Dobriyan | 4be2854 | 2007-10-16 23:26:21 -0700 | [diff] [blame] | 2950 | struct ctl_table; |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2951 | int proc_nr_files(struct ctl_table *table, int write, |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2952 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Christoph Hellwig | 312d3ca | 2010-10-10 05:36:23 -0400 | [diff] [blame] | 2953 | int proc_nr_dentry(struct ctl_table *table, int write, |
| 2954 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 2955 | int proc_nr_inodes(struct ctl_table *table, int write, |
| 2956 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Tetsuo Handa | 38e23c9 | 2009-04-09 20:17:52 +0900 | [diff] [blame] | 2957 | int __init get_filesystem_list(char *buf); |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2958 | |
Namhyung Kim | 3cd90ea | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2959 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
Namhyung Kim | 1a44bc8 | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2960 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
| 2961 | |
Al Viro | 6d12552 | 2009-12-24 06:58:56 -0500 | [diff] [blame] | 2962 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
Eric Paris | ecf081d | 2009-12-17 21:24:25 -0500 | [diff] [blame] | 2963 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
Namhyung Kim | 1a44bc8 | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2964 | (flag & __FMODE_NONOTIFY))) |
Al Viro | 5300990 | 2009-12-19 10:15:07 -0500 | [diff] [blame] | 2965 | |
Al Viro | 8d334ac | 2011-07-24 23:21:59 -0400 | [diff] [blame] | 2966 | static inline int is_sxid(umode_t mode) |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 2967 | { |
| 2968 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); |
| 2969 | } |
| 2970 | |
Miklos Szeredi | cbdf35b | 2014-10-24 00:14:36 +0200 | [diff] [blame] | 2971 | static inline int check_sticky(struct inode *dir, struct inode *inode) |
| 2972 | { |
| 2973 | if (!(dir->i_mode & S_ISVTX)) |
| 2974 | return 0; |
| 2975 | |
| 2976 | return __check_sticky(dir, inode); |
| 2977 | } |
| 2978 | |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 2979 | static inline void inode_has_no_xattr(struct inode *inode) |
| 2980 | { |
Al Viro | 9e1f1de | 2011-06-03 18:24:58 -0400 | [diff] [blame] | 2981 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 2982 | inode->i_flags |= S_NOSEC; |
| 2983 | } |
| 2984 | |
Al Viro | a740022 | 2014-10-21 15:20:42 -0400 | [diff] [blame] | 2985 | static inline bool is_root_inode(struct inode *inode) |
| 2986 | { |
| 2987 | return inode == inode->i_sb->s_root->d_inode; |
| 2988 | } |
| 2989 | |
Al Viro | 5f99f4e | 2013-05-15 20:23:06 -0400 | [diff] [blame] | 2990 | static inline bool dir_emit(struct dir_context *ctx, |
| 2991 | const char *name, int namelen, |
| 2992 | u64 ino, unsigned type) |
| 2993 | { |
| 2994 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; |
| 2995 | } |
| 2996 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) |
| 2997 | { |
| 2998 | return ctx->actor(ctx, ".", 1, ctx->pos, |
| 2999 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; |
| 3000 | } |
| 3001 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) |
| 3002 | { |
| 3003 | return ctx->actor(ctx, "..", 2, ctx->pos, |
| 3004 | parent_ino(file->f_path.dentry), DT_DIR) == 0; |
| 3005 | } |
| 3006 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) |
| 3007 | { |
| 3008 | if (ctx->pos == 0) { |
| 3009 | if (!dir_emit_dot(file, ctx)) |
| 3010 | return false; |
| 3011 | ctx->pos = 1; |
| 3012 | } |
| 3013 | if (ctx->pos == 1) { |
| 3014 | if (!dir_emit_dotdot(file, ctx)) |
| 3015 | return false; |
| 3016 | ctx->pos = 2; |
| 3017 | } |
| 3018 | return true; |
| 3019 | } |
Al Viro | 5ded75e | 2013-05-15 21:02:48 -0400 | [diff] [blame] | 3020 | static inline bool dir_relax(struct inode *inode) |
| 3021 | { |
| 3022 | mutex_unlock(&inode->i_mutex); |
| 3023 | mutex_lock(&inode->i_mutex); |
| 3024 | return !IS_DEADDIR(inode); |
| 3025 | } |
Al Viro | 5f99f4e | 2013-05-15 20:23:06 -0400 | [diff] [blame] | 3026 | |
Eric W. Biederman | 90f8572 | 2015-06-29 14:42:03 -0500 | [diff] [blame] | 3027 | extern bool path_noexec(const struct path *path); |
| 3028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | #endif /* _LINUX_FS_H */ |