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 | |
| 5 | #include <linux/linkage.h> |
| 6 | #include <linux/wait.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <linux/kdev_t.h> |
| 8 | #include <linux/dcache.h> |
Al Viro | 3f8206d | 2008-07-26 03:46:43 -0400 | [diff] [blame] | 9 | #include <linux/path.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/stat.h> |
| 11 | #include <linux/cache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/list.h> |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 13 | #include <linux/list_lru.h> |
Oleg Nesterov | 4f5e65a | 2013-07-08 14:24:16 -0700 | [diff] [blame] | 14 | #include <linux/llist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/radix-tree.h> |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 16 | #include <linux/rbtree.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/init.h> |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 18 | #include <linux/pid.h> |
Paul Gortmaker | 187f188 | 2011-11-23 20:12:59 -0500 | [diff] [blame] | 19 | #include <linux/bug.h> |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 20 | #include <linux/mutex.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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/byteorder.h> |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 34 | #include <uapi/linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 36 | struct export_operations; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 37 | struct hd_geometry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | struct iovec; |
| 39 | struct nameidata; |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 40 | struct kiocb; |
Alexey Dobriyan | 57cc721 | 2011-01-10 08:18:25 +0200 | [diff] [blame] | 41 | struct kobject; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | struct pipe_inode_info; |
| 43 | struct poll_table_struct; |
| 44 | struct kstatfs; |
| 45 | struct vm_area_struct; |
| 46 | struct vfsmount; |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 47 | struct cred; |
Mel Gorman | a509bc1 | 2012-07-31 16:44:57 -0700 | [diff] [blame] | 48 | struct swap_info_struct; |
Cyrill Gorcunov | 55985dd | 2012-12-17 16:04:55 -0800 | [diff] [blame] | 49 | struct seq_file; |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 50 | struct workqueue_struct; |
Al Viro | 3b93f91 | 2014-02-11 21:34:08 -0500 | [diff] [blame] | 51 | struct iov_iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Denis Cheng | 74bf17c | 2007-10-16 23:26:30 -0700 | [diff] [blame] | 53 | extern void __init inode_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | extern void __init inode_init_early(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | extern void __init files_init(unsigned long); |
| 56 | |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 57 | extern struct files_stat_struct files_stat; |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 58 | extern unsigned long get_max_files(void); |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 59 | extern int sysctl_nr_open; |
| 60 | extern struct inodes_stat_t inodes_stat; |
| 61 | extern int leases_enable, lease_break_time; |
Kees Cook | 800179c | 2012-07-25 17:29:07 -0700 | [diff] [blame] | 62 | extern int sysctl_protected_symlinks; |
| 63 | extern int sysctl_protected_hardlinks; |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | struct buffer_head; |
| 66 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
| 67 | struct buffer_head *bh_result, int create); |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 68 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 69 | ssize_t bytes, void *private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 71 | #define MAY_EXEC 0x00000001 |
| 72 | #define MAY_WRITE 0x00000002 |
| 73 | #define MAY_READ 0x00000004 |
| 74 | #define MAY_APPEND 0x00000008 |
| 75 | #define MAY_ACCESS 0x00000010 |
| 76 | #define MAY_OPEN 0x00000020 |
| 77 | #define MAY_CHDIR 0x00000040 |
| 78 | /* called from RCU mode, don't block */ |
| 79 | #define MAY_NOT_BLOCK 0x00000080 |
| 80 | |
| 81 | /* |
| 82 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
| 83 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
| 84 | */ |
| 85 | |
| 86 | /* file is open for reading */ |
| 87 | #define FMODE_READ ((__force fmode_t)0x1) |
| 88 | /* file is open for writing */ |
| 89 | #define FMODE_WRITE ((__force fmode_t)0x2) |
| 90 | /* file is seekable */ |
| 91 | #define FMODE_LSEEK ((__force fmode_t)0x4) |
| 92 | /* file can be accessed using pread */ |
| 93 | #define FMODE_PREAD ((__force fmode_t)0x8) |
| 94 | /* file can be accessed using pwrite */ |
| 95 | #define FMODE_PWRITE ((__force fmode_t)0x10) |
| 96 | /* File is opened for execution with sys_execve / sys_uselib */ |
| 97 | #define FMODE_EXEC ((__force fmode_t)0x20) |
| 98 | /* File is opened with O_NDELAY (only set for block devices) */ |
| 99 | #define FMODE_NDELAY ((__force fmode_t)0x40) |
| 100 | /* File is opened with O_EXCL (only set for block devices) */ |
| 101 | #define FMODE_EXCL ((__force fmode_t)0x80) |
| 102 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
| 103 | (specialy hack for floppy.c) */ |
| 104 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
| 105 | /* 32bit hashes as llseek() offset (for directories) */ |
| 106 | #define FMODE_32BITHASH ((__force fmode_t)0x200) |
| 107 | /* 64bit hashes as llseek() offset (for directories) */ |
| 108 | #define FMODE_64BITHASH ((__force fmode_t)0x400) |
| 109 | |
| 110 | /* |
| 111 | * Don't update ctime and mtime. |
| 112 | * |
| 113 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
| 114 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
| 115 | */ |
| 116 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
| 117 | |
| 118 | /* Expect random access pattern */ |
| 119 | #define FMODE_RANDOM ((__force fmode_t)0x1000) |
| 120 | |
| 121 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
| 122 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) |
| 123 | |
| 124 | /* File is opened with O_PATH; almost nothing can be done with it */ |
| 125 | #define FMODE_PATH ((__force fmode_t)0x4000) |
| 126 | |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 127 | /* File needs atomic accesses to f_pos */ |
| 128 | #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) |
Al Viro | 83f936c | 2014-03-14 12:02:47 -0400 | [diff] [blame] | 129 | /* Write access to underlying fs */ |
| 130 | #define FMODE_WRITER ((__force fmode_t)0x10000) |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 131 | |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 132 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
| 133 | #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) |
| 134 | |
| 135 | /* |
| 136 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector |
| 137 | * that indicates that they should check the contents of the iovec are |
| 138 | * valid, but not check the memory that the iovec elements |
| 139 | * points too. |
| 140 | */ |
| 141 | #define CHECK_IOVEC_ONLY -1 |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* |
David Howells | 08cce05c | 2012-10-13 10:45:06 +0100 | [diff] [blame] | 144 | * The below are the various read and write types that we support. Some of |
| 145 | * them include behavioral modifiers that send information down to the |
| 146 | * block layer and IO scheduler. Terminology: |
| 147 | * |
| 148 | * The block layer uses device plugging to defer IO a little bit, in |
| 149 | * the hope that we will see more IO very shortly. This increases |
| 150 | * coalescing of adjacent IO and thus reduces the number of IOs we |
| 151 | * have to send to the device. It also allows for better queuing, |
| 152 | * if the IO isn't mergeable. If the caller is going to be waiting |
| 153 | * for the IO, then he must ensure that the device is unplugged so |
| 154 | * that the IO is dispatched to the driver. |
| 155 | * |
| 156 | * All IO is handled async in Linux. This is fine for background |
| 157 | * writes, but for reads or writes that someone waits for completion |
| 158 | * on, we want to notify the block layer and IO scheduler so that they |
| 159 | * know about it. That allows them to make better scheduling |
| 160 | * decisions. So when the below references 'sync' and 'async', it |
| 161 | * is referencing this priority hint. |
| 162 | * |
| 163 | * With that in mind, the available types are: |
| 164 | * |
| 165 | * READ A normal read operation. Device will be plugged. |
| 166 | * READ_SYNC A synchronous read. Device is not plugged, caller can |
| 167 | * immediately wait on this read without caring about |
| 168 | * unplugging. |
| 169 | * READA Used for read-ahead operations. Lower priority, and the |
| 170 | * block layer could (in theory) choose to ignore this |
| 171 | * request if it runs into resource problems. |
| 172 | * WRITE A normal async write. Device will be plugged. |
| 173 | * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
| 174 | * the hint that someone will be waiting on this IO |
| 175 | * shortly. The write equivalent of READ_SYNC. |
| 176 | * WRITE_ODIRECT Special case write for O_DIRECT only. |
| 177 | * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
| 178 | * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on |
| 179 | * non-volatile media on completion. |
| 180 | * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded |
| 181 | * by a cache flush and data is guaranteed to be on |
| 182 | * non-volatile media on completion. |
| 183 | * |
| 184 | */ |
| 185 | #define RW_MASK REQ_WRITE |
| 186 | #define RWA_MASK REQ_RAHEAD |
| 187 | |
| 188 | #define READ 0 |
| 189 | #define WRITE RW_MASK |
| 190 | #define READA RWA_MASK |
| 191 | #define KERNEL_READ (READ|REQ_KERNEL) |
| 192 | #define KERNEL_WRITE (WRITE|REQ_KERNEL) |
| 193 | |
| 194 | #define READ_SYNC (READ | REQ_SYNC) |
| 195 | #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
| 196 | #define WRITE_ODIRECT (WRITE | REQ_SYNC) |
| 197 | #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
| 198 | #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) |
| 199 | #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) |
| 200 | |
| 201 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | * Attribute flags. These should be or-ed together to figure out what |
| 203 | * has been changed! |
| 204 | */ |
Miklos Szeredi | 9767d74 | 2008-07-01 15:01:26 +0200 | [diff] [blame] | 205 | #define ATTR_MODE (1 << 0) |
| 206 | #define ATTR_UID (1 << 1) |
| 207 | #define ATTR_GID (1 << 2) |
| 208 | #define ATTR_SIZE (1 << 3) |
| 209 | #define ATTR_ATIME (1 << 4) |
| 210 | #define ATTR_MTIME (1 << 5) |
| 211 | #define ATTR_CTIME (1 << 6) |
| 212 | #define ATTR_ATIME_SET (1 << 7) |
| 213 | #define ATTR_MTIME_SET (1 << 8) |
| 214 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
| 215 | #define ATTR_ATTR_FLAG (1 << 10) |
| 216 | #define ATTR_KILL_SUID (1 << 11) |
| 217 | #define ATTR_KILL_SGID (1 << 12) |
| 218 | #define ATTR_FILE (1 << 13) |
| 219 | #define ATTR_KILL_PRIV (1 << 14) |
| 220 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
| 221 | #define ATTR_TIMES_SET (1 << 16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* |
| 224 | * This is the Inode Attributes structure, used for notify_change(). It |
| 225 | * uses the above definitions as flags, to know which values have changed. |
| 226 | * Also, in this manner, a Filesystem can look at only the values it cares |
| 227 | * about. Basically, these are the attributes that the VFS layer can |
| 228 | * request to change from the FS layer. |
| 229 | * |
| 230 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
| 231 | */ |
| 232 | struct iattr { |
| 233 | unsigned int ia_valid; |
| 234 | umode_t ia_mode; |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 235 | kuid_t ia_uid; |
| 236 | kgid_t ia_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | loff_t ia_size; |
| 238 | struct timespec ia_atime; |
| 239 | struct timespec ia_mtime; |
| 240 | struct timespec ia_ctime; |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 241 | |
| 242 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 243 | * Not an attribute, but an auxiliary info for filesystems wanting to |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 244 | * implement an ftruncate() like method. NOTE: filesystem should |
| 245 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
| 246 | */ |
| 247 | struct file *ia_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | }; |
| 249 | |
| 250 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | * Includes for diskquotas. |
| 252 | */ |
| 253 | #include <linux/quota.h> |
| 254 | |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 255 | /** |
| 256 | * enum positive_aop_returns - aop return codes with specific semantics |
| 257 | * |
| 258 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
| 259 | * completed, that the page is still locked, and |
| 260 | * should be considered active. The VM uses this hint |
| 261 | * to return the page to the active list -- it won't |
| 262 | * be a candidate for writeback again in the near |
| 263 | * future. Other callers must be careful to unlock |
| 264 | * the page if they get this return. Returned by |
| 265 | * writepage(); |
| 266 | * |
| 267 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
| 268 | * unlocked it and the page might have been truncated. |
| 269 | * The caller should back up to acquiring a new page and |
| 270 | * trying again. The aop will be taking reasonable |
| 271 | * precautions not to livelock. If the caller held a page |
| 272 | * reference, it should drop it before retrying. Returned |
Nick Piggin | 5514476 | 2007-10-16 01:25:26 -0700 | [diff] [blame] | 273 | * by readpage(). |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 274 | * |
| 275 | * address_space_operation functions return these large constants to indicate |
| 276 | * special semantics to the caller. These are much larger than the bytes in a |
| 277 | * page to allow for functions that return the number of bytes operated on in a |
| 278 | * given page. |
| 279 | */ |
| 280 | |
| 281 | enum positive_aop_returns { |
| 282 | AOP_WRITEPAGE_ACTIVATE = 0x80000, |
| 283 | AOP_TRUNCATED_PAGE = 0x80001, |
| 284 | }; |
| 285 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 286 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
Nick Piggin | 89e1078 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 287 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 288 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
| 289 | * helper code (eg buffer layer) |
| 290 | * to clear GFP_FS from alloc */ |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* |
| 293 | * oh the beauties of C type declarations. |
| 294 | */ |
| 295 | struct page; |
| 296 | struct address_space; |
| 297 | struct writeback_control; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 299 | /* |
| 300 | * "descriptor" for what we're up to with a read. |
| 301 | * This allows us to use the same read code yet |
| 302 | * have multiple different users of the data that |
| 303 | * we read from a file. |
| 304 | * |
| 305 | * The simplest case just copies the data to user |
| 306 | * mode. |
| 307 | */ |
| 308 | typedef struct { |
| 309 | size_t written; |
| 310 | size_t count; |
| 311 | union { |
| 312 | char __user *buf; |
| 313 | void *data; |
| 314 | } arg; |
| 315 | int error; |
| 316 | } read_descriptor_t; |
| 317 | |
| 318 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
| 319 | unsigned long, unsigned long); |
Nick Piggin | 2f718ff | 2007-10-16 01:24:59 -0700 | [diff] [blame] | 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | struct address_space_operations { |
| 322 | int (*writepage)(struct page *page, struct writeback_control *wbc); |
| 323 | int (*readpage)(struct file *, struct page *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | /* Write back some dirty pages from this mapping. */ |
| 326 | int (*writepages)(struct address_space *, struct writeback_control *); |
| 327 | |
Andrew Morton | 4741c9f | 2006-03-24 03:18:11 -0800 | [diff] [blame] | 328 | /* Set a page dirty. Return true if this dirtied it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | int (*set_page_dirty)(struct page *page); |
| 330 | |
| 331 | int (*readpages)(struct file *filp, struct address_space *mapping, |
| 332 | struct list_head *pages, unsigned nr_pages); |
| 333 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 334 | int (*write_begin)(struct file *, struct address_space *mapping, |
| 335 | loff_t pos, unsigned len, unsigned flags, |
| 336 | struct page **pagep, void **fsdata); |
| 337 | int (*write_end)(struct file *, struct address_space *mapping, |
| 338 | loff_t pos, unsigned len, unsigned copied, |
| 339 | struct page *page, void *fsdata); |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
| 342 | sector_t (*bmap)(struct address_space *, sector_t); |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 343 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 344 | int (*releasepage) (struct page *, gfp_t); |
Linus Torvalds | 6072d13 | 2010-12-01 13:35:19 -0500 | [diff] [blame] | 345 | void (*freepage)(struct page *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
| 347 | loff_t offset, unsigned long nr_segs); |
Nick Piggin | 70688e4 | 2008-04-28 02:13:02 -0700 | [diff] [blame] | 348 | int (*get_xip_mem)(struct address_space *, pgoff_t, int, |
| 349 | void **, unsigned long *); |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 350 | /* |
Tang Chen | ef277c7 | 2013-07-08 16:00:21 -0700 | [diff] [blame] | 351 | * migrate the contents of a page to the specified target. If |
| 352 | * migrate_mode is MIGRATE_ASYNC, it must not block. |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 353 | */ |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 354 | int (*migratepage) (struct address_space *, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 355 | struct page *, struct page *, enum migrate_mode); |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 356 | int (*launder_page) (struct page *); |
Al Viro | c186afb4 | 2014-02-02 21:16:54 -0500 | [diff] [blame] | 357 | int (*is_partially_uptodate) (struct page *, unsigned long, |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 358 | unsigned long); |
Mel Gorman | b459722 | 2013-07-03 15:02:05 -0700 | [diff] [blame] | 359 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
Andi Kleen | 2571873 | 2009-09-16 11:50:13 +0200 | [diff] [blame] | 360 | int (*error_remove_page)(struct address_space *, struct page *); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 361 | |
| 362 | /* swapfile support */ |
Mel Gorman | a509bc1 | 2012-07-31 16:44:57 -0700 | [diff] [blame] | 363 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
| 364 | sector_t *span); |
| 365 | void (*swap_deactivate)(struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | }; |
| 367 | |
Jens Axboe | 7dcda1c | 2011-04-05 23:51:48 +0200 | [diff] [blame] | 368 | extern const struct address_space_operations empty_aops; |
| 369 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 370 | /* |
| 371 | * pagecache_write_begin/pagecache_write_end must be used by general code |
| 372 | * to write into the pagecache. |
| 373 | */ |
| 374 | int pagecache_write_begin(struct file *, struct address_space *mapping, |
| 375 | loff_t pos, unsigned len, unsigned flags, |
| 376 | struct page **pagep, void **fsdata); |
| 377 | |
| 378 | int pagecache_write_end(struct file *, struct address_space *mapping, |
| 379 | loff_t pos, unsigned len, unsigned copied, |
| 380 | struct page *page, void *fsdata); |
| 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | struct backing_dev_info; |
| 383 | struct address_space { |
| 384 | struct inode *host; /* owner: inode, block_device */ |
| 385 | struct radix_tree_root page_tree; /* radix tree of all pages */ |
Nick Piggin | 19fd623 | 2008-07-25 19:45:32 -0700 | [diff] [blame] | 386 | spinlock_t tree_lock; /* and lock protecting it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 388 | struct rb_root i_mmap; /* tree of private and shared mappings */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ |
Peter Zijlstra | 3d48ae4 | 2011-05-24 17:12:06 -0700 | [diff] [blame] | 390 | struct mutex i_mmap_mutex; /* protect tree, count, list */ |
Jan Kara | 0814257 | 2011-06-27 16:18:10 -0700 | [diff] [blame] | 391 | /* Protected by tree_lock together with the radix tree */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | unsigned long nrpages; /* number of total pages */ |
Johannes Weiner | 91b0abe | 2014-04-03 14:47:49 -0700 | [diff] [blame] | 393 | unsigned long nrshadows; /* number of shadow entries */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | pgoff_t writeback_index;/* writeback starts here */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 395 | const struct address_space_operations *a_ops; /* methods */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | unsigned long flags; /* error bits/gfp mask */ |
| 397 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ |
| 398 | spinlock_t private_lock; /* for use by the address_space */ |
| 399 | struct list_head private_list; /* ditto */ |
Rafael Aquini | 252aa6f | 2012-12-11 16:02:35 -0800 | [diff] [blame] | 400 | void *private_data; /* ditto */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } __attribute__((aligned(sizeof(long)))); |
| 402 | /* |
| 403 | * On most architectures that alignment is already the case; but |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 404 | * must be enforced here for CRIS, to let the least significant bit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
| 406 | */ |
Andi Kleen | 87192a2 | 2012-01-12 17:20:34 -0800 | [diff] [blame] | 407 | struct request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
| 409 | struct block_device { |
| 410 | 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] | 411 | int bd_openers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | struct inode * bd_inode; /* will die */ |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 413 | struct super_block * bd_super; |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 414 | struct mutex bd_mutex; /* open/close mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | struct list_head bd_inodes; |
Tejun Heo | 6b4517a | 2010-04-07 18:53:59 +0900 | [diff] [blame] | 416 | void * bd_claiming; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | void * bd_holder; |
| 418 | int bd_holders; |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 419 | bool bd_write_holder; |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 420 | #ifdef CONFIG_SYSFS |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 421 | struct list_head bd_holder_disks; |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 422 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | struct block_device * bd_contains; |
| 424 | unsigned bd_block_size; |
| 425 | struct hd_struct * bd_part; |
| 426 | /* number of times partitions within this device have been opened. */ |
| 427 | unsigned bd_part_count; |
| 428 | int bd_invalidated; |
| 429 | struct gendisk * bd_disk; |
Andi Kleen | 87192a2 | 2012-01-12 17:20:34 -0800 | [diff] [blame] | 430 | struct request_queue * bd_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | struct list_head bd_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | /* |
| 433 | * Private data. You must have bd_claim'ed the block_device |
| 434 | * to use this. NOTE: bd_claim allows an owner to claim |
| 435 | * the same device multiple times, the owner must take special |
| 436 | * care to not mess up bd_private for that case. |
| 437 | */ |
| 438 | unsigned long bd_private; |
Takashi Sato | fcccf50 | 2009-01-09 16:40:59 -0800 | [diff] [blame] | 439 | |
| 440 | /* The counter of freeze processes */ |
| 441 | int bd_fsfreeze_count; |
| 442 | /* Mutex for freeze */ |
| 443 | struct mutex bd_fsfreeze_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | }; |
| 445 | |
| 446 | /* |
| 447 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
| 448 | * radix trees |
| 449 | */ |
| 450 | #define PAGECACHE_TAG_DIRTY 0 |
| 451 | #define PAGECACHE_TAG_WRITEBACK 1 |
Jan Kara | f446daae | 2010-08-09 17:19:12 -0700 | [diff] [blame] | 452 | #define PAGECACHE_TAG_TOWRITE 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
| 454 | int mapping_tagged(struct address_space *mapping, int tag); |
| 455 | |
| 456 | /* |
| 457 | * Might pages of this file be mapped into userspace? |
| 458 | */ |
| 459 | static inline int mapping_mapped(struct address_space *mapping) |
| 460 | { |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 461 | return !RB_EMPTY_ROOT(&mapping->i_mmap) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | !list_empty(&mapping->i_mmap_nonlinear); |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Might pages of this file have been modified in userspace? |
| 467 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
| 468 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
| 469 | * writing i.e. vma may be mprotected writable even if now readonly. |
| 470 | */ |
| 471 | static inline int mapping_writably_mapped(struct address_space *mapping) |
| 472 | { |
| 473 | return mapping->i_mmap_writable != 0; |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Use sequence counter to get consistent i_size on 32-bit processors. |
| 478 | */ |
| 479 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 480 | #include <linux/seqlock.h> |
| 481 | #define __NEED_I_SIZE_ORDERED |
| 482 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
| 483 | #else |
| 484 | #define i_size_ordered_init(inode) do { } while (0) |
| 485 | #endif |
| 486 | |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 487 | struct posix_acl; |
| 488 | #define ACL_NOT_CACHED ((void *)(-1)) |
| 489 | |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 490 | #define IOP_FASTPERM 0x0001 |
| 491 | #define IOP_LOOKUP 0x0002 |
| 492 | #define IOP_NOFOLLOW 0x0004 |
| 493 | |
| 494 | /* |
| 495 | * Keep mostly read-only and often accessed (especially for |
| 496 | * the RCU path lookup and 'stat' data) fields at the beginning |
| 497 | * of the 'struct inode' |
| 498 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | struct inode { |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 500 | umode_t i_mode; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 501 | unsigned short i_opflags; |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 502 | kuid_t i_uid; |
| 503 | kgid_t i_gid; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 504 | unsigned int i_flags; |
| 505 | |
| 506 | #ifdef CONFIG_FS_POSIX_ACL |
| 507 | struct posix_acl *i_acl; |
| 508 | struct posix_acl *i_default_acl; |
| 509 | #endif |
| 510 | |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 511 | const struct inode_operations *i_op; |
| 512 | struct super_block *i_sb; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 513 | struct address_space *i_mapping; |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 514 | |
Linus Torvalds | 13e12d1 | 2011-06-08 15:18:19 -0700 | [diff] [blame] | 515 | #ifdef CONFIG_SECURITY |
| 516 | void *i_security; |
| 517 | #endif |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 518 | |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 519 | /* Stat data, not accessed from path walking */ |
| 520 | unsigned long i_ino; |
Miklos Szeredi | a78ef70 | 2011-10-28 14:13:30 +0200 | [diff] [blame] | 521 | /* |
| 522 | * Filesystems may only read i_nlink directly. They shall use the |
| 523 | * following functions for modification: |
| 524 | * |
| 525 | * (set|clear|inc|drop)_nlink |
| 526 | * inode_(inc|dec)_link_count |
| 527 | */ |
| 528 | union { |
| 529 | const unsigned int i_nlink; |
| 530 | unsigned int __i_nlink; |
| 531 | }; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 532 | dev_t i_rdev; |
Linus Torvalds | 2f9d3df | 2012-06-03 14:50:19 -0700 | [diff] [blame] | 533 | loff_t i_size; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 534 | struct timespec i_atime; |
| 535 | struct timespec i_mtime; |
| 536 | struct timespec i_ctime; |
Theodore Ts'o | 6cdbb0e | 2011-10-29 08:24:18 -0400 | [diff] [blame] | 537 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
| 538 | unsigned short i_bytes; |
Linus Torvalds | 2f9d3df | 2012-06-03 14:50:19 -0700 | [diff] [blame] | 539 | unsigned int i_blkbits; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 540 | blkcnt_t i_blocks; |
| 541 | |
| 542 | #ifdef __NEED_I_SIZE_ORDERED |
| 543 | seqcount_t i_size_seqcount; |
| 544 | #endif |
| 545 | |
| 546 | /* Misc */ |
| 547 | unsigned long i_state; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 548 | struct mutex i_mutex; |
Linus Torvalds | 13e12d1 | 2011-06-08 15:18:19 -0700 | [diff] [blame] | 549 | |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 550 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
| 551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | struct hlist_node i_hash; |
Nick Piggin | 7ccf19a | 2010-10-21 11:49:30 +1100 | [diff] [blame] | 553 | struct list_head i_wb_list; /* backing dev IO list */ |
| 554 | struct list_head i_lru; /* inode LRU list */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | struct list_head i_sb_list; |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 556 | union { |
Al Viro | b3d9b7a | 2012-06-09 13:51:19 -0400 | [diff] [blame] | 557 | struct hlist_head i_dentry; |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 558 | struct rcu_head i_rcu; |
| 559 | }; |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 560 | u64 i_version; |
Linus Torvalds | 2f9d3df | 2012-06-03 14:50:19 -0700 | [diff] [blame] | 561 | atomic_t i_count; |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 562 | atomic_t i_dio_count; |
Theodore Ts'o | 6cdbb0e | 2011-10-29 08:24:18 -0400 | [diff] [blame] | 563 | atomic_t i_writecount; |
Mimi Zohar | d984ea6 | 2013-12-11 15:20:54 -0500 | [diff] [blame] | 564 | #ifdef CONFIG_IMA |
| 565 | atomic_t i_readcount; /* struct files open RO */ |
| 566 | #endif |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 567 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | struct file_lock *i_flock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | struct address_space i_data; |
| 570 | #ifdef CONFIG_QUOTA |
| 571 | struct dquot *i_dquot[MAXQUOTAS]; |
| 572 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | struct list_head i_devices; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 574 | union { |
| 575 | struct pipe_inode_info *i_pipe; |
Theodore Ts'o | eaf796e | 2006-09-27 01:50:48 -0700 | [diff] [blame] | 576 | struct block_device *i_bdev; |
Theodore Ts'o | 577c4eb | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 577 | struct cdev *i_cdev; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 578 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | __u32 i_generation; |
| 581 | |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 582 | #ifdef CONFIG_FSNOTIFY |
| 583 | __u32 i_fsnotify_mask; /* all events this inode cares about */ |
Eric Paris | e61ce86 | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 584 | struct hlist_head i_fsnotify_marks; |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 585 | #endif |
| 586 | |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 587 | void *i_private; /* fs or device private pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | }; |
| 589 | |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 590 | static inline int inode_unhashed(struct inode *inode) |
| 591 | { |
| 592 | return hlist_unhashed(&inode->i_hash); |
| 593 | } |
| 594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | /* |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 596 | * inode->i_mutex nesting subclasses for the lock validator: |
| 597 | * |
| 598 | * 0: the object of the current VFS operation |
| 599 | * 1: parent |
| 600 | * 2: child/target |
J. Bruce Fields | 40bd22c | 2012-04-18 15:21:34 -0400 | [diff] [blame] | 601 | * 3: xattr |
| 602 | * 4: second non-directory |
| 603 | * The last is for certain operations (such as rename) which lock two |
| 604 | * non-directories at once. |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 605 | * |
| 606 | * The locking order between these classes is |
J. Bruce Fields | 40bd22c | 2012-04-18 15:21:34 -0400 | [diff] [blame] | 607 | * parent -> child -> normal -> xattr -> second non-directory |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 608 | */ |
| 609 | enum inode_i_mutex_lock_class |
| 610 | { |
| 611 | I_MUTEX_NORMAL, |
| 612 | I_MUTEX_PARENT, |
| 613 | I_MUTEX_CHILD, |
Ingo Molnar | 4df4624 | 2006-08-27 01:23:56 -0700 | [diff] [blame] | 614 | I_MUTEX_XATTR, |
J. Bruce Fields | 40bd22c | 2012-04-18 15:21:34 -0400 | [diff] [blame] | 615 | I_MUTEX_NONDIR2 |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 616 | }; |
| 617 | |
J. Bruce Fields | 375e289 | 2012-04-18 15:16:33 -0400 | [diff] [blame] | 618 | void lock_two_nondirectories(struct inode *, struct inode*); |
| 619 | void unlock_two_nondirectories(struct inode *, struct inode*); |
| 620 | |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 621 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | * NOTE: in a 32bit arch with a preemptable kernel and |
| 623 | * an UP compile the i_size_read/write must be atomic |
| 624 | * with respect to the local cpu (unlike with preempt disabled), |
| 625 | * but they don't need to be atomic with respect to other cpus like in |
| 626 | * true SMP (so they need either to either locally disable irq around |
| 627 | * the read or for example on x86 they can be still implemented as a |
| 628 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
| 629 | * and 64bit archs it makes no difference if preempt is enabled or not. |
| 630 | */ |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 631 | static inline loff_t i_size_read(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | { |
| 633 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 634 | loff_t i_size; |
| 635 | unsigned int seq; |
| 636 | |
| 637 | do { |
| 638 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
| 639 | i_size = inode->i_size; |
| 640 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
| 641 | return i_size; |
| 642 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 643 | loff_t i_size; |
| 644 | |
| 645 | preempt_disable(); |
| 646 | i_size = inode->i_size; |
| 647 | preempt_enable(); |
| 648 | return i_size; |
| 649 | #else |
| 650 | return inode->i_size; |
| 651 | #endif |
| 652 | } |
| 653 | |
Miklos Szeredi | 7762f5a | 2006-10-17 00:10:07 -0700 | [diff] [blame] | 654 | /* |
| 655 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
| 656 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
| 657 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
| 658 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
| 660 | { |
| 661 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
Fan Du | 74e3d1e | 2013-04-30 15:27:27 -0700 | [diff] [blame] | 662 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | write_seqcount_begin(&inode->i_size_seqcount); |
| 664 | inode->i_size = i_size; |
| 665 | write_seqcount_end(&inode->i_size_seqcount); |
Fan Du | 74e3d1e | 2013-04-30 15:27:27 -0700 | [diff] [blame] | 666 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 668 | preempt_disable(); |
| 669 | inode->i_size = i_size; |
| 670 | preempt_enable(); |
| 671 | #else |
| 672 | inode->i_size = i_size; |
| 673 | #endif |
| 674 | } |
| 675 | |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 676 | /* Helper functions so that in most cases filesystems will |
| 677 | * not need to deal directly with kuid_t and kgid_t and can |
| 678 | * instead deal with the raw numeric values that are stored |
| 679 | * in the filesystem. |
| 680 | */ |
| 681 | static inline uid_t i_uid_read(const struct inode *inode) |
| 682 | { |
| 683 | return from_kuid(&init_user_ns, inode->i_uid); |
| 684 | } |
| 685 | |
| 686 | static inline gid_t i_gid_read(const struct inode *inode) |
| 687 | { |
| 688 | return from_kgid(&init_user_ns, inode->i_gid); |
| 689 | } |
| 690 | |
| 691 | static inline void i_uid_write(struct inode *inode, uid_t uid) |
| 692 | { |
| 693 | inode->i_uid = make_kuid(&init_user_ns, uid); |
| 694 | } |
| 695 | |
| 696 | static inline void i_gid_write(struct inode *inode, gid_t gid) |
| 697 | { |
| 698 | inode->i_gid = make_kgid(&init_user_ns, gid); |
| 699 | } |
| 700 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 701 | static inline unsigned iminor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
| 703 | return MINOR(inode->i_rdev); |
| 704 | } |
| 705 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 706 | static inline unsigned imajor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | { |
| 708 | return MAJOR(inode->i_rdev); |
| 709 | } |
| 710 | |
| 711 | extern struct block_device *I_BDEV(struct inode *inode); |
| 712 | |
| 713 | struct fown_struct { |
| 714 | rwlock_t lock; /* protects pid, uid, euid fields */ |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 715 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
| 716 | 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] | 717 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | int signum; /* posix.1b rt signal to be delivered on IO */ |
| 719 | }; |
| 720 | |
| 721 | /* |
| 722 | * Track a single file's readahead state |
| 723 | */ |
| 724 | struct file_ra_state { |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 725 | pgoff_t start; /* where readahead started */ |
| 726 | unsigned int size; /* # of readahead pages */ |
| 727 | unsigned int async_size; /* do asynchronous readahead when |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 728 | there are only # of pages ahead */ |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 729 | |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 730 | unsigned int ra_pages; /* Maximum readahead window */ |
Wu Fengguang | 1ebf26a | 2009-06-16 15:31:19 -0700 | [diff] [blame] | 731 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
Fengguang Wu | f4e6b49 | 2007-10-16 01:24:33 -0700 | [diff] [blame] | 732 | loff_t prev_pos; /* Cache last read() position */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 735 | /* |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 736 | * Check if @index falls in the readahead windows. |
| 737 | */ |
| 738 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
| 739 | { |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 740 | return (index >= ra->start && |
| 741 | index < ra->start + ra->size); |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | struct file { |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 745 | union { |
Oleg Nesterov | 4f5e65a | 2013-07-08 14:24:16 -0700 | [diff] [blame] | 746 | struct llist_node fu_llist; |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 747 | struct rcu_head fu_rcuhead; |
| 748 | } f_u; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 749 | struct path f_path; |
| 750 | #define f_dentry f_path.dentry |
Al Viro | dd37978 | 2013-03-01 19:48:30 -0500 | [diff] [blame] | 751 | struct inode *f_inode; /* cached value */ |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 752 | const struct file_operations *f_op; |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 753 | |
| 754 | /* |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 755 | * Protects f_ep_links, f_flags. |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 756 | * Must not be taken from IRQ context. |
| 757 | */ |
| 758 | spinlock_t f_lock; |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 759 | atomic_long_t f_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | unsigned int f_flags; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 761 | fmode_t f_mode; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 762 | struct mutex f_pos_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | loff_t f_pos; |
| 764 | struct fown_struct f_owner; |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 765 | const struct cred *f_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | struct file_ra_state f_ra; |
| 767 | |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 768 | u64 f_version; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 769 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | void *f_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 771 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | /* needed for tty driver, and maybe others */ |
| 773 | void *private_data; |
| 774 | |
| 775 | #ifdef CONFIG_EPOLL |
| 776 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
| 777 | struct list_head f_ep_links; |
Jason Baron | 28d82dc | 2012-01-12 17:17:43 -0800 | [diff] [blame] | 778 | struct list_head f_tfile_llink; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | #endif /* #ifdef CONFIG_EPOLL */ |
| 780 | struct address_space *f_mapping; |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 781 | } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Aneesh Kumar K.V | 990d6c2 | 2011-01-29 18:43:26 +0530 | [diff] [blame] | 783 | struct file_handle { |
| 784 | __u32 handle_bytes; |
| 785 | int handle_type; |
| 786 | /* file identifier */ |
| 787 | unsigned char f_handle[0]; |
| 788 | }; |
| 789 | |
Al Viro | cb0942b | 2012-08-27 14:48:26 -0400 | [diff] [blame] | 790 | static inline struct file *get_file(struct file *f) |
| 791 | { |
| 792 | atomic_long_inc(&f->f_count); |
| 793 | return f; |
| 794 | } |
Al Viro | d7065da | 2010-05-26 15:13:55 -0400 | [diff] [blame] | 795 | #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] | 796 | #define file_count(x) atomic_long_read(&(x)->f_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | #define MAX_NON_LFS ((1UL<<31) - 1) |
| 799 | |
| 800 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
| 801 | limits, otherwise bad things can happen in VM. */ |
| 802 | #if BITS_PER_LONG==32 |
Chuck Lever | 2bd2c19 | 2012-09-24 14:51:48 -0400 | [diff] [blame] | 803 | #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] | 804 | #elif BITS_PER_LONG==64 |
Al Viro | 614c321 | 2012-10-10 01:06:20 -0400 | [diff] [blame] | 805 | #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | #endif |
| 807 | |
| 808 | #define FL_POSIX 1 |
| 809 | #define FL_FLOCK 2 |
J. Bruce Fields | 617588d | 2011-07-01 15:18:34 -0400 | [diff] [blame] | 810 | #define FL_DELEG 4 /* NFSv4 delegation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
Trond Myklebust | f475ae9 | 2006-06-29 16:38:32 -0400 | [diff] [blame] | 812 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | #define FL_LEASE 32 /* lease held on this file */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 814 | #define FL_CLOSE 64 /* unlock on close */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | #define FL_SLEEP 128 /* A blocking lock */ |
J. Bruce Fields | 778fc54 | 2011-07-26 18:25:49 -0400 | [diff] [blame] | 816 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
| 817 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ |
Jeff Layton | cff2fce | 2014-04-22 08:24:32 -0400 | [diff] [blame^] | 818 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | /* |
Miklos Szeredi | bde74e4 | 2008-07-25 01:48:57 -0700 | [diff] [blame] | 821 | * Special return value from posix_lock_file() and vfs_lock_file() for |
| 822 | * asynchronous locking. |
| 823 | */ |
| 824 | #define FILE_LOCK_DEFERRED 1 |
| 825 | |
| 826 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | * The POSIX file lock owner is determined by |
| 828 | * the "struct files_struct" in the thread group |
| 829 | * (or NULL for no owner - BSD locks). |
| 830 | * |
| 831 | * Lockd stuffs a "host" pointer into this. |
| 832 | */ |
| 833 | typedef struct files_struct *fl_owner_t; |
| 834 | |
| 835 | struct file_lock_operations { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| 837 | void (*fl_release_private)(struct file_lock *); |
| 838 | }; |
| 839 | |
| 840 | struct lock_manager_operations { |
J. Bruce Fields | 8fb47a4 | 2011-07-20 20:21:59 -0400 | [diff] [blame] | 841 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
Jeff Layton | 3999e49 | 2013-06-21 08:58:19 -0400 | [diff] [blame] | 842 | unsigned long (*lm_owner_key)(struct file_lock *); |
J. Bruce Fields | 8fb47a4 | 2011-07-20 20:21:59 -0400 | [diff] [blame] | 843 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
| 844 | int (*lm_grant)(struct file_lock *, struct file_lock *, int); |
J. Bruce Fields | 8fb47a4 | 2011-07-20 20:21:59 -0400 | [diff] [blame] | 845 | void (*lm_break)(struct file_lock *); |
| 846 | int (*lm_change)(struct file_lock **, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | }; |
| 848 | |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 849 | struct lock_manager { |
| 850 | struct list_head list; |
| 851 | }; |
| 852 | |
Stanislav Kinsbursky | 5ccb006 | 2012-07-25 16:57:22 +0400 | [diff] [blame] | 853 | struct net; |
| 854 | void locks_start_grace(struct net *, struct lock_manager *); |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 855 | void locks_end_grace(struct lock_manager *); |
Stanislav Kinsbursky | 5ccb006 | 2012-07-25 16:57:22 +0400 | [diff] [blame] | 856 | int locks_in_grace(struct net *); |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | /* that will die - we need it for nfs_lock_info */ |
| 859 | #include <linux/nfs_fs_i.h> |
| 860 | |
Jeff Layton | 1cb3601 | 2013-06-21 08:58:12 -0400 | [diff] [blame] | 861 | /* |
| 862 | * struct file_lock represents a generic "file lock". It's used to represent |
| 863 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to |
| 864 | * note that the same struct is used to represent both a request for a lock and |
| 865 | * the lock itself, but the same object is never used for both. |
| 866 | * |
| 867 | * FIXME: should we create a separate "struct lock_request" to help distinguish |
| 868 | * these two uses? |
| 869 | * |
| 870 | * The i_flock list is ordered by: |
| 871 | * |
| 872 | * 1) lock type -- FL_LEASEs first, then FL_FLOCK, and finally FL_POSIX |
| 873 | * 2) lock owner |
| 874 | * 3) lock range start |
| 875 | * 4) lock range end |
| 876 | * |
| 877 | * Obviously, the last two criteria only matter for POSIX locks. |
| 878 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | struct file_lock { |
| 880 | struct file_lock *fl_next; /* singly linked list for this inode */ |
Jeff Layton | 139ca04 | 2013-06-21 08:58:17 -0400 | [diff] [blame] | 881 | struct hlist_node fl_link; /* node in global lists */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | struct list_head fl_block; /* circular list of blocked processes */ |
| 883 | fl_owner_t fl_owner; |
J. Bruce Fields | 710b721 | 2011-07-26 16:28:29 -0400 | [diff] [blame] | 884 | unsigned int fl_flags; |
Richard Kennedy | afc1246 | 2008-07-11 17:20:49 -0700 | [diff] [blame] | 885 | unsigned char fl_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | unsigned int fl_pid; |
Jeff Layton | 7012b02 | 2013-06-21 08:58:22 -0400 | [diff] [blame] | 887 | int fl_link_cpu; /* what cpu's list is this on? */ |
Vitaliy Gusev | ab1f161 | 2008-01-17 00:07:08 +0000 | [diff] [blame] | 888 | struct pid *fl_nspid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | wait_queue_head_t fl_wait; |
| 890 | struct file *fl_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | loff_t fl_start; |
| 892 | loff_t fl_end; |
| 893 | |
| 894 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
J. Bruce Fields | 778fc54 | 2011-07-26 18:25:49 -0400 | [diff] [blame] | 895 | /* for lease breaks: */ |
| 896 | unsigned long fl_break_time; |
| 897 | unsigned long fl_downgrade_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
Alexey Dobriyan | 6aed628 | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 899 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
Alexey Dobriyan | 7b02196 | 2009-09-21 17:01:12 -0700 | [diff] [blame] | 900 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | union { |
| 902 | struct nfs_lock_info nfs_fl; |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 903 | struct nfs4_lock_info nfs4_fl; |
David Howells | e8d6c55 | 2007-07-15 23:40:12 -0700 | [diff] [blame] | 904 | struct { |
| 905 | struct list_head link; /* link in AFS vnode's pending_locks list */ |
| 906 | int state; /* state of grant or error if -ve */ |
| 907 | } afs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | } fl_u; |
| 909 | }; |
| 910 | |
| 911 | /* The following constant reflects the upper bound of the file/locking space */ |
| 912 | #ifndef OFFSET_MAX |
| 913 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
| 914 | #define OFFSET_MAX INT_LIMIT(loff_t) |
| 915 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
| 916 | #endif |
| 917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | #include <linux/fcntl.h> |
| 919 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 920 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
| 921 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 922 | #ifdef CONFIG_FILE_LOCKING |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 923 | extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 924 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
| 925 | struct flock __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
| 927 | #if BITS_PER_LONG == 32 |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 928 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 929 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
| 930 | struct flock64 __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | #endif |
| 932 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
| 934 | extern int fcntl_getlease(struct file *filp); |
| 935 | |
| 936 | /* fs/locks.c */ |
J. Bruce Fields | 05fa313 | 2010-10-30 17:31:15 -0400 | [diff] [blame] | 937 | void locks_free_lock(struct file_lock *fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | extern void locks_init_lock(struct file_lock *); |
Arnd Bergmann | c5b1f0d | 2010-10-27 15:46:08 +0200 | [diff] [blame] | 939 | extern struct file_lock * locks_alloc_lock(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
J. Bruce Fields | 1a747ee | 2008-04-24 10:08:22 -0400 | [diff] [blame] | 941 | extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | extern void locks_remove_posix(struct file *, fl_owner_t); |
Jeff Layton | 78ed8a1 | 2014-02-03 12:13:08 -0500 | [diff] [blame] | 943 | extern void locks_remove_file(struct file *); |
Felix Blyakher | a9e61e2 | 2009-03-31 15:12:56 -0500 | [diff] [blame] | 944 | extern void locks_release_private(struct file_lock *); |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 945 | extern void posix_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 946 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
Jeff Layton | f891a29 | 2013-06-21 08:58:09 -0400 | [diff] [blame] | 948 | extern int posix_unblock_lock(struct file_lock *); |
J. Bruce Fields | 3ee17ab | 2007-02-21 00:58:50 -0500 | [diff] [blame] | 949 | extern int vfs_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 950 | 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] | 951 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 953 | 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] | 954 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
Christoph Hellwig | 0af1a45 | 2007-07-31 00:39:22 -0700 | [diff] [blame] | 955 | extern int generic_setlease(struct file *, long, struct file_lock **); |
J. Bruce Fields | a9933ce | 2007-06-07 17:09:49 -0400 | [diff] [blame] | 956 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | extern int lease_modify(struct file_lock **, int); |
| 958 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); |
| 959 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 960 | #else /* !CONFIG_FILE_LOCKING */ |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 961 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
| 962 | struct flock __user *user) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 963 | { |
| 964 | return -EINVAL; |
| 965 | } |
| 966 | |
| 967 | static inline int fcntl_setlk(unsigned int fd, struct file *file, |
| 968 | unsigned int cmd, struct flock __user *user) |
| 969 | { |
| 970 | return -EACCES; |
| 971 | } |
| 972 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 973 | #if BITS_PER_LONG == 32 |
Jeff Layton | c1e62b8 | 2014-02-03 12:13:09 -0500 | [diff] [blame] | 974 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
| 975 | struct flock64 __user *user) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 976 | { |
| 977 | return -EINVAL; |
| 978 | } |
| 979 | |
| 980 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
| 981 | unsigned int cmd, struct flock64 __user *user) |
| 982 | { |
| 983 | return -EACCES; |
| 984 | } |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 985 | #endif |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 986 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
| 987 | { |
| 988 | return 0; |
| 989 | } |
| 990 | |
| 991 | static inline int fcntl_getlease(struct file *filp) |
| 992 | { |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | static inline void locks_init_lock(struct file_lock *fl) |
| 997 | { |
| 998 | return; |
| 999 | } |
| 1000 | |
| 1001 | static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 1002 | { |
| 1003 | return; |
| 1004 | } |
| 1005 | |
| 1006 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 1007 | { |
| 1008 | return; |
| 1009 | } |
| 1010 | |
| 1011 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
| 1012 | { |
| 1013 | return; |
| 1014 | } |
| 1015 | |
Jeff Layton | 78ed8a1 | 2014-02-03 12:13:08 -0500 | [diff] [blame] | 1016 | static inline void locks_remove_file(struct file *filp) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1017 | { |
| 1018 | return; |
| 1019 | } |
| 1020 | |
| 1021 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
| 1022 | { |
| 1023 | return; |
| 1024 | } |
| 1025 | |
| 1026 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
| 1027 | struct file_lock *conflock) |
| 1028 | { |
| 1029 | return -ENOLCK; |
| 1030 | } |
| 1031 | |
| 1032 | static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) |
| 1033 | { |
| 1034 | return -ENOLCK; |
| 1035 | } |
| 1036 | |
Jeff Layton | f891a29 | 2013-06-21 08:58:09 -0400 | [diff] [blame] | 1037 | static inline int posix_unblock_lock(struct file_lock *waiter) |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1038 | { |
| 1039 | return -ENOENT; |
| 1040 | } |
| 1041 | |
| 1042 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
| 1043 | { |
| 1044 | return 0; |
| 1045 | } |
| 1046 | |
| 1047 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
| 1048 | struct file_lock *fl, struct file_lock *conf) |
| 1049 | { |
| 1050 | return -ENOLCK; |
| 1051 | } |
| 1052 | |
| 1053 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
| 1054 | { |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | static inline int flock_lock_file_wait(struct file *filp, |
| 1059 | struct file_lock *request) |
| 1060 | { |
| 1061 | return -ENOLCK; |
| 1062 | } |
| 1063 | |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 1064 | 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] | 1065 | { |
| 1066 | return 0; |
| 1067 | } |
| 1068 | |
| 1069 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
| 1070 | { |
| 1071 | return; |
| 1072 | } |
| 1073 | |
| 1074 | static inline int generic_setlease(struct file *filp, long arg, |
| 1075 | struct file_lock **flp) |
| 1076 | { |
| 1077 | return -EINVAL; |
| 1078 | } |
| 1079 | |
| 1080 | static inline int vfs_setlease(struct file *filp, long arg, |
| 1081 | struct file_lock **lease) |
| 1082 | { |
| 1083 | return -EINVAL; |
| 1084 | } |
| 1085 | |
| 1086 | static inline int lease_modify(struct file_lock **before, int arg) |
| 1087 | { |
| 1088 | return -EINVAL; |
| 1089 | } |
| 1090 | |
| 1091 | static inline int lock_may_read(struct inode *inode, loff_t start, |
| 1092 | unsigned long len) |
| 1093 | { |
| 1094 | return 1; |
| 1095 | } |
| 1096 | |
| 1097 | static inline int lock_may_write(struct inode *inode, loff_t start, |
| 1098 | unsigned long len) |
| 1099 | { |
| 1100 | return 1; |
| 1101 | } |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1102 | #endif /* !CONFIG_FILE_LOCKING */ |
| 1103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | |
| 1105 | struct fasync_struct { |
Eric Dumazet | 989a297 | 2010-04-14 09:55:35 +0000 | [diff] [blame] | 1106 | spinlock_t fa_lock; |
| 1107 | int magic; |
| 1108 | int fa_fd; |
| 1109 | struct fasync_struct *fa_next; /* singly linked list */ |
| 1110 | struct file *fa_file; |
| 1111 | struct rcu_head fa_rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | }; |
| 1113 | |
| 1114 | #define FASYNC_MAGIC 0x4601 |
| 1115 | |
| 1116 | /* SMP safe fasync helpers: */ |
| 1117 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
Linus Torvalds | f7347ce | 2010-10-27 12:38:12 -0400 | [diff] [blame] | 1118 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
| 1119 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); |
| 1120 | extern struct fasync_struct *fasync_alloc(void); |
| 1121 | extern void fasync_free(struct fasync_struct *); |
| 1122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | /* can be called from interrupts */ |
| 1124 | extern void kill_fasync(struct fasync_struct **, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1126 | extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
| 1128 | extern void f_delown(struct file *filp); |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1129 | extern pid_t f_getown(struct file *filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | extern int send_sigurg(struct fown_struct *fown); |
| 1131 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1132 | struct mm_struct; |
| 1133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | /* |
| 1135 | * Umount options |
| 1136 | */ |
| 1137 | |
| 1138 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
| 1139 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
| 1140 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
Miklos Szeredi | db1f05b | 2010-02-10 12:15:53 +0100 | [diff] [blame] | 1141 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
| 1142 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
| 1144 | extern struct list_head super_blocks; |
| 1145 | extern spinlock_t sb_lock; |
| 1146 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1147 | /* Possible states of 'frozen' field */ |
| 1148 | enum { |
| 1149 | SB_UNFROZEN = 0, /* FS is unfrozen */ |
| 1150 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1151 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
| 1152 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop |
| 1153 | * internal threads if needed) */ |
| 1154 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ |
| 1155 | }; |
| 1156 | |
| 1157 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) |
| 1158 | |
| 1159 | struct sb_writers { |
| 1160 | /* Counters for counting writers at each level */ |
| 1161 | struct percpu_counter counter[SB_FREEZE_LEVELS]; |
| 1162 | wait_queue_head_t wait; /* queue for waiting for |
| 1163 | writers / faults to finish */ |
| 1164 | int frozen; /* Is sb frozen? */ |
| 1165 | wait_queue_head_t wait_unfrozen; /* queue for waiting for |
| 1166 | sb to be thawed */ |
| 1167 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 1168 | struct lockdep_map lock_map[SB_FREEZE_LEVELS]; |
| 1169 | #endif |
| 1170 | }; |
| 1171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | struct super_block { |
| 1173 | struct list_head s_list; /* Keep this first */ |
| 1174 | dev_t s_dev; /* search index; _not_ kdev_t */ |
Richard Kennedy | 270ba5f | 2010-01-26 14:12:43 +0000 | [diff] [blame] | 1175 | unsigned char s_blocksize_bits; |
| 1176 | unsigned long s_blocksize; |
Jeff Layton | 42cb56a | 2009-09-18 13:05:53 -0700 | [diff] [blame] | 1177 | loff_t s_maxbytes; /* Max file size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | struct file_system_type *s_type; |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 1179 | const struct super_operations *s_op; |
Alexey Dobriyan | 61e225d | 2009-09-21 17:01:08 -0700 | [diff] [blame] | 1180 | const struct dquot_operations *dq_op; |
Alexey Dobriyan | 0d54b21 | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1181 | const struct quotactl_ops *s_qcop; |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 1182 | const struct export_operations *s_export_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | unsigned long s_flags; |
| 1184 | unsigned long s_magic; |
| 1185 | struct dentry *s_root; |
| 1186 | struct rw_semaphore s_umount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | int s_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | atomic_t s_active; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1189 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | void *s_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1191 | #endif |
Stephen Hemminger | bb43545 | 2010-05-13 17:53:14 -0700 | [diff] [blame] | 1192 | const struct xattr_handler **s_xattr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | |
| 1194 | struct list_head s_inodes; /* all inodes */ |
Nick Piggin | ceb5bdc | 2011-01-07 17:50:05 +1100 | [diff] [blame] | 1195 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
Miklos Szeredi | 39f7c4d | 2011-11-21 12:11:30 +0100 | [diff] [blame] | 1196 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | struct block_device *s_bdev; |
Jens Axboe | 32a88aa | 2009-09-16 15:02:33 +0200 | [diff] [blame] | 1198 | struct backing_dev_info *s_bdi; |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 1199 | struct mtd_info *s_mtd; |
Al Viro | a516616 | 2011-12-12 22:53:00 -0500 | [diff] [blame] | 1200 | struct hlist_node s_instances; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | struct quota_info s_dquot; /* Diskquota specific options */ |
| 1202 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1203 | struct sb_writers s_writers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
| 1205 | char s_id[32]; /* Informational name */ |
Linus Torvalds | 0bba016 | 2011-04-12 15:21:04 -0700 | [diff] [blame] | 1206 | u8 s_uuid[16]; /* UUID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | |
| 1208 | void *s_fs_info; /* Filesystem private info */ |
Al Viro | 8de5277 | 2012-02-06 12:45:27 -0500 | [diff] [blame] | 1209 | unsigned int s_max_links; |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 1210 | fmode_t s_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | |
Richard Kennedy | 270ba5f | 2010-01-26 14:12:43 +0000 | [diff] [blame] | 1212 | /* Granularity of c/m/atime in ns. |
| 1213 | Cannot be worse than a second */ |
| 1214 | u32 s_time_gran; |
| 1215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | /* |
| 1217 | * The next field is for VFS *only*. No filesystems have any business |
| 1218 | * even looking at it. You had been warned. |
| 1219 | */ |
Arjan van de Ven | a11f3a0 | 2006-03-23 03:00:33 -0800 | [diff] [blame] | 1220 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 1222 | /* |
| 1223 | * Filesystem subtype. If non-empty the filesystem type field |
| 1224 | * in /proc/mounts will be "type.subtype" |
| 1225 | */ |
| 1226 | char *s_subtype; |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 1227 | |
| 1228 | /* |
| 1229 | * Saved mount options for lazy filesystems using |
| 1230 | * generic_show_options() |
| 1231 | */ |
Arnd Bergmann | 4d2deb4 | 2010-02-24 20:01:56 +0100 | [diff] [blame] | 1232 | char __rcu *s_options; |
Al Viro | c8aebb0 | 2010-12-18 10:22:30 -0500 | [diff] [blame] | 1233 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
Dan Magenheimer | 9fdfdcf | 2011-05-26 10:01:19 -0600 | [diff] [blame] | 1234 | |
| 1235 | /* |
| 1236 | * Saved pool identifier for cleancache (-1 means none) |
| 1237 | */ |
| 1238 | int cleancache_poolid; |
Dave Chinner | b0d40c9 | 2011-07-08 14:14:42 +1000 | [diff] [blame] | 1239 | |
| 1240 | struct shrinker s_shrink; /* per-sb shrinker handle */ |
Miklos Szeredi | 4ed5e82 | 2011-11-21 12:11:31 +0100 | [diff] [blame] | 1241 | |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 1242 | /* Number of inodes with nlink == 0 but still referenced */ |
| 1243 | atomic_long_t s_remove_count; |
| 1244 | |
Miklos Szeredi | 4ed5e82 | 2011-11-21 12:11:31 +0100 | [diff] [blame] | 1245 | /* Being remounted read-only */ |
| 1246 | int s_readonly_remount; |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 1247 | |
| 1248 | /* AIO completions deferred from interrupt context */ |
| 1249 | struct workqueue_struct *s_dio_done_wq; |
Dave Chinner | f604156 | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 1250 | |
| 1251 | /* |
| 1252 | * Keep the lru lists last in the structure so they always sit on their |
| 1253 | * own individual cachelines. |
| 1254 | */ |
| 1255 | struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; |
| 1256 | struct list_lru s_inode_lru ____cacheline_aligned_in_smp; |
Al Viro | e2fec7c | 2013-10-04 17:06:56 -0400 | [diff] [blame] | 1257 | struct rcu_head rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | }; |
| 1259 | |
| 1260 | extern struct timespec current_fs_time(struct super_block *sb); |
| 1261 | |
| 1262 | /* |
| 1263 | * Snapshotting support. |
| 1264 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1266 | void __sb_end_write(struct super_block *sb, int level); |
| 1267 | int __sb_start_write(struct super_block *sb, int level, bool wait); |
| 1268 | |
| 1269 | /** |
| 1270 | * sb_end_write - drop write access to a superblock |
| 1271 | * @sb: the super we wrote to |
| 1272 | * |
| 1273 | * Decrement number of writers to the filesystem. Wake up possible waiters |
| 1274 | * wanting to freeze the filesystem. |
| 1275 | */ |
| 1276 | static inline void sb_end_write(struct super_block *sb) |
| 1277 | { |
| 1278 | __sb_end_write(sb, SB_FREEZE_WRITE); |
| 1279 | } |
| 1280 | |
| 1281 | /** |
| 1282 | * sb_end_pagefault - drop write access to a superblock from a page fault |
| 1283 | * @sb: the super we wrote to |
| 1284 | * |
| 1285 | * Decrement number of processes handling write page fault to the filesystem. |
| 1286 | * Wake up possible waiters wanting to freeze the filesystem. |
| 1287 | */ |
| 1288 | static inline void sb_end_pagefault(struct super_block *sb) |
| 1289 | { |
| 1290 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); |
| 1291 | } |
| 1292 | |
| 1293 | /** |
| 1294 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes |
| 1295 | * @sb: the super we wrote to |
| 1296 | * |
| 1297 | * Decrement fs-internal number of writers to the filesystem. Wake up possible |
| 1298 | * waiters wanting to freeze the filesystem. |
| 1299 | */ |
| 1300 | static inline void sb_end_intwrite(struct super_block *sb) |
| 1301 | { |
| 1302 | __sb_end_write(sb, SB_FREEZE_FS); |
| 1303 | } |
| 1304 | |
| 1305 | /** |
| 1306 | * sb_start_write - get write access to a superblock |
| 1307 | * @sb: the super we write to |
| 1308 | * |
| 1309 | * When a process wants to write data or metadata to a file system (i.e. dirty |
| 1310 | * a page or an inode), it should embed the operation in a sb_start_write() - |
| 1311 | * sb_end_write() pair to get exclusion against file system freezing. This |
| 1312 | * function increments number of writers preventing freezing. If the file |
| 1313 | * system is already frozen, the function waits until the file system is |
| 1314 | * thawed. |
| 1315 | * |
| 1316 | * Since freeze protection behaves as a lock, users have to preserve |
| 1317 | * ordering of freeze protection and other filesystem locks. Generally, |
| 1318 | * freeze protection should be the outermost lock. In particular, we have: |
| 1319 | * |
| 1320 | * sb_start_write |
| 1321 | * -> i_mutex (write path, truncate, directory ops, ...) |
| 1322 | * -> s_umount (freeze_super, thaw_super) |
| 1323 | */ |
| 1324 | static inline void sb_start_write(struct super_block *sb) |
| 1325 | { |
| 1326 | __sb_start_write(sb, SB_FREEZE_WRITE, true); |
| 1327 | } |
| 1328 | |
| 1329 | static inline int sb_start_write_trylock(struct super_block *sb) |
| 1330 | { |
| 1331 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); |
| 1332 | } |
| 1333 | |
| 1334 | /** |
| 1335 | * sb_start_pagefault - get write access to a superblock from a page fault |
| 1336 | * @sb: the super we write to |
| 1337 | * |
| 1338 | * When a process starts handling write page fault, it should embed the |
| 1339 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get |
| 1340 | * exclusion against file system freezing. This is needed since the page fault |
| 1341 | * is going to dirty a page. This function increments number of running page |
| 1342 | * faults preventing freezing. If the file system is already frozen, the |
| 1343 | * function waits until the file system is thawed. |
| 1344 | * |
| 1345 | * Since page fault freeze protection behaves as a lock, users have to preserve |
| 1346 | * ordering of freeze protection and other filesystem locks. It is advised to |
| 1347 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault |
| 1348 | * handling code implies lock dependency: |
| 1349 | * |
| 1350 | * mmap_sem |
| 1351 | * -> sb_start_pagefault |
| 1352 | */ |
| 1353 | static inline void sb_start_pagefault(struct super_block *sb) |
| 1354 | { |
| 1355 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); |
| 1356 | } |
| 1357 | |
| 1358 | /* |
| 1359 | * sb_start_intwrite - get write access to a superblock for internal fs purposes |
| 1360 | * @sb: the super we write to |
| 1361 | * |
| 1362 | * This is the third level of protection against filesystem freezing. It is |
| 1363 | * free for use by a filesystem. The only requirement is that it must rank |
| 1364 | * below sb_start_pagefault. |
| 1365 | * |
| 1366 | * For example filesystem can call sb_start_intwrite() when starting a |
| 1367 | * transaction which somewhat eases handling of freezing for internal sources |
| 1368 | * of filesystem changes (internal fs threads, discarding preallocation on file |
| 1369 | * close, etc.). |
| 1370 | */ |
| 1371 | static inline void sb_start_intwrite(struct super_block *sb) |
| 1372 | { |
| 1373 | __sb_start_write(sb, SB_FREEZE_FS, true); |
| 1374 | } |
| 1375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 1377 | extern bool inode_owner_or_capable(const struct inode *inode); |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 1378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | /* |
| 1380 | * VFS helper functions.. |
| 1381 | */ |
Al Viro | 312b63f | 2012-06-10 18:09:36 -0400 | [diff] [blame] | 1382 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 1383 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 1384 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1385 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
J. Bruce Fields | 146a859 | 2011-09-20 17:14:31 -0400 | [diff] [blame] | 1386 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | extern int vfs_rmdir(struct inode *, struct dentry *); |
J. Bruce Fields | b21996e | 2011-09-20 09:14:34 -0400 | [diff] [blame] | 1388 | extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
Miklos Szeredi | 520c8b1 | 2014-04-01 17:08:42 +0200 | [diff] [blame] | 1389 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | |
| 1391 | /* |
| 1392 | * VFS dentry helper functions. |
| 1393 | */ |
| 1394 | extern void dentry_unhash(struct dentry *dentry); |
| 1395 | |
| 1396 | /* |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 1397 | * VFS file helper functions. |
| 1398 | */ |
Dmitry Monakhov | a1bd120 | 2010-03-04 17:29:14 +0300 | [diff] [blame] | 1399 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
Al Viro | 62bb109 | 2011-07-24 23:20:18 -0400 | [diff] [blame] | 1400 | umode_t mode); |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 1401 | /* |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1402 | * VFS FS_IOC_FIEMAP helper definitions. |
| 1403 | */ |
| 1404 | struct fiemap_extent_info { |
| 1405 | unsigned int fi_flags; /* Flags as passed from user */ |
| 1406 | unsigned int fi_extents_mapped; /* Number of mapped extents */ |
| 1407 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
Namhyung Kim | ecf5632 | 2011-01-16 23:28:17 +0900 | [diff] [blame] | 1408 | struct fiemap_extent __user *fi_extents_start; /* Start of |
| 1409 | fiemap_extent array */ |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1410 | }; |
| 1411 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
| 1412 | u64 phys, u64 len, u32 flags); |
| 1413 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
| 1414 | |
| 1415 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | * File types |
| 1417 | * |
| 1418 | * NOTE! These match bits 12..15 of stat.st_mode |
| 1419 | * (ie "(i_mode >> 12) & 15"). |
| 1420 | */ |
| 1421 | #define DT_UNKNOWN 0 |
| 1422 | #define DT_FIFO 1 |
| 1423 | #define DT_CHR 2 |
| 1424 | #define DT_DIR 4 |
| 1425 | #define DT_BLK 6 |
| 1426 | #define DT_REG 8 |
| 1427 | #define DT_LNK 10 |
| 1428 | #define DT_SOCK 12 |
| 1429 | #define DT_WHT 14 |
| 1430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | /* |
| 1432 | * This is the "filldir" function type, used by readdir() to let |
| 1433 | * the kernel specify what kind of dirent layout it wants to have. |
| 1434 | * This allows the kernel to read directories into kernel space or |
| 1435 | * to have different dirent layouts depending on the binary type. |
| 1436 | */ |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 1437 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 1438 | struct dir_context { |
Al Viro | ac6614b | 2013-05-22 22:22:04 -0400 | [diff] [blame] | 1439 | const filldir_t actor; |
Al Viro | bb6f619 | 2013-05-15 18:49:12 -0400 | [diff] [blame] | 1440 | loff_t pos; |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 1441 | }; |
Al Viro | bb6f619 | 2013-05-15 18:49:12 -0400 | [diff] [blame] | 1442 | |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1443 | struct block_device_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | /* These macros are for out of kernel modules to test that |
| 1446 | * the kernel supports the unlocked_ioctl and compat_ioctl |
| 1447 | * fields in struct file_operations. */ |
| 1448 | #define HAVE_COMPAT_IOCTL 1 |
| 1449 | #define HAVE_UNLOCKED_IOCTL 1 |
| 1450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | struct file_operations { |
| 1452 | struct module *owner; |
| 1453 | loff_t (*llseek) (struct file *, loff_t, int); |
| 1454 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 1456 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
| 1457 | ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
Al Viro | bb6f619 | 2013-05-15 18:49:12 -0400 | [diff] [blame] | 1458 | int (*iterate) (struct file *, struct dir_context *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
| 1461 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
| 1462 | int (*mmap) (struct file *, struct vm_area_struct *); |
| 1463 | int (*open) (struct inode *, struct file *); |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1464 | int (*flush) (struct file *, fl_owner_t id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | int (*release) (struct inode *, struct file *); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1466 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | int (*aio_fsync) (struct kiocb *, int datasync); |
| 1468 | int (*fasync) (int, struct file *, int); |
| 1469 | int (*lock) (struct file *, int, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
| 1471 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 1472 | int (*check_flags)(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | int (*flock) (struct file *, int, struct file_lock *); |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 1474 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
| 1475 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
J. Bruce Fields | f9ffed2 | 2006-11-14 15:51:40 -0500 | [diff] [blame] | 1476 | int (*setlease)(struct file *, long, struct file_lock **); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1477 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
| 1478 | loff_t len); |
Cyrill Gorcunov | 55985dd | 2012-12-17 16:04:55 -0800 | [diff] [blame] | 1479 | int (*show_fdinfo)(struct seq_file *m, struct file *f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | }; |
| 1481 | |
| 1482 | struct inode_operations { |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 1483 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1484 | void * (*follow_link) (struct dentry *, struct nameidata *); |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1485 | int (*permission) (struct inode *, int); |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 1486 | struct posix_acl * (*get_acl)(struct inode *, int); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1487 | |
| 1488 | int (*readlink) (struct dentry *, char __user *,int); |
| 1489 | void (*put_link) (struct dentry *, struct nameidata *, void *); |
| 1490 | |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 1491 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
| 1493 | int (*unlink) (struct inode *,struct dentry *); |
| 1494 | int (*symlink) (struct inode *,struct dentry *,const char *); |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 1495 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | int (*rmdir) (struct inode *,struct dentry *); |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 1497 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | int (*rename) (struct inode *, struct dentry *, |
| 1499 | struct inode *, struct dentry *); |
Miklos Szeredi | 520c8b1 | 2014-04-01 17:08:42 +0200 | [diff] [blame] | 1500 | int (*rename2) (struct inode *, struct dentry *, |
| 1501 | struct inode *, struct dentry *, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | int (*setattr) (struct dentry *, struct iattr *); |
| 1503 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
| 1504 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
| 1505 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
| 1506 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
| 1507 | int (*removexattr) (struct dentry *, const char *); |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1508 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
| 1509 | u64 len); |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1510 | int (*update_time)(struct inode *, struct timespec *, int); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1511 | int (*atomic_open)(struct inode *, struct dentry *, |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 1512 | struct file *, unsigned open_flag, |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1513 | umode_t create_mode, int *opened); |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 1514 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
Christoph Hellwig | 893d46e | 2013-12-20 05:16:39 -0800 | [diff] [blame] | 1515 | int (*set_acl)(struct inode *, struct posix_acl *, int); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1516 | } ____cacheline_aligned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 1518 | 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] | 1519 | unsigned long nr_segs, unsigned long fast_segs, |
| 1520 | struct iovec *fast_pointer, |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 1521 | struct iovec **ret_pointer); |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 1522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
| 1524 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
| 1525 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
| 1526 | unsigned long, loff_t *); |
| 1527 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
| 1528 | unsigned long, loff_t *); |
| 1529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | struct super_operations { |
| 1531 | struct inode *(*alloc_inode)(struct super_block *sb); |
| 1532 | void (*destroy_inode)(struct inode *); |
| 1533 | |
Christoph Hellwig | aa38572 | 2011-05-27 06:53:02 -0400 | [diff] [blame] | 1534 | void (*dirty_inode) (struct inode *, int flags); |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 1535 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1536 | int (*drop_inode) (struct inode *); |
Al Viro | be7ce41 | 2010-06-04 19:40:39 -0400 | [diff] [blame] | 1537 | void (*evict_inode) (struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | void (*put_super) (struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | int (*sync_fs)(struct super_block *sb, int wait); |
Takashi Sato | c4be0c1 | 2009-01-09 16:40:58 -0800 | [diff] [blame] | 1540 | int (*freeze_fs) (struct super_block *); |
| 1541 | int (*unfreeze_fs) (struct super_block *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1542 | int (*statfs) (struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | int (*remount_fs) (struct super_block *, int *, char *); |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 1544 | void (*umount_begin) (struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 1546 | int (*show_options)(struct seq_file *, struct dentry *); |
Al Viro | d861c63 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 1547 | int (*show_devname)(struct seq_file *, struct dentry *); |
Al Viro | a6322de | 2011-12-08 21:37:57 -0500 | [diff] [blame] | 1548 | int (*show_path)(struct seq_file *, struct dentry *); |
Al Viro | 6413237 | 2011-12-08 20:51:13 -0500 | [diff] [blame] | 1549 | int (*show_stats)(struct seq_file *, struct dentry *); |
Alexey Dobriyan | 0e51a72 | 2006-09-29 01:59:56 -0700 | [diff] [blame] | 1550 | #ifdef CONFIG_QUOTA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
| 1552 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
Alexey Dobriyan | 0e51a72 | 2006-09-29 01:59:56 -0700 | [diff] [blame] | 1553 | #endif |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 1554 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
Dave Chinner | 9b17c62 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1555 | long (*nr_cached_objects)(struct super_block *, int); |
| 1556 | long (*free_cached_objects)(struct super_block *, long, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | }; |
| 1558 | |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1559 | /* |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1560 | * Inode flags - they have no relation to superblock flags now |
| 1561 | */ |
| 1562 | #define S_SYNC 1 /* Writes are synced at once */ |
| 1563 | #define S_NOATIME 2 /* Do not update access times */ |
| 1564 | #define S_APPEND 4 /* Append-only file */ |
| 1565 | #define S_IMMUTABLE 8 /* Immutable file */ |
| 1566 | #define S_DEAD 16 /* removed, but still open directory */ |
| 1567 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
| 1568 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
| 1569 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
| 1570 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
| 1571 | #define S_PRIVATE 512 /* Inode is fs-internal */ |
| 1572 | #define S_IMA 1024 /* Inode has an associated IMA struct */ |
| 1573 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
| 1574 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ |
| 1575 | |
| 1576 | /* |
| 1577 | * Note that nosuid etc flags are inode-specific: setting some file-system |
| 1578 | * flags just means all the inodes inherit those flags by default. It might be |
| 1579 | * possible to override it selectively if you really wanted to with some |
| 1580 | * ioctl() that is not currently implemented. |
| 1581 | * |
| 1582 | * Exception: MS_RDONLY is always applied to the entire file system. |
| 1583 | * |
| 1584 | * Unfortunately, it is possible to change a filesystems flags with it mounted |
| 1585 | * with files in use. This means that all of the inodes will not have their |
| 1586 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| 1587 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| 1588 | */ |
| 1589 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) |
| 1590 | |
| 1591 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| 1592 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| 1593 | ((inode)->i_flags & S_SYNC)) |
| 1594 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| 1595 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| 1596 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
| 1597 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
| 1598 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
| 1599 | |
| 1600 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| 1601 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| 1602 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
| 1603 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| 1604 | |
| 1605 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| 1606 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| 1607 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| 1608 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
| 1609 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
| 1610 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
| 1611 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
| 1612 | |
| 1613 | /* |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1614 | * Inode state bits. Protected by inode->i_lock |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1615 | * |
| 1616 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
| 1617 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
| 1618 | * |
| 1619 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
| 1620 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
| 1621 | * various stages of removing an inode. |
| 1622 | * |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1623 | * 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] | 1624 | * |
Joern Engel | e7ca2d4 | 2008-02-06 01:36:59 -0800 | [diff] [blame] | 1625 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
| 1626 | * fdatasync(). i_atime is the usual cause. |
Jan Kara | 000cb48 | 2008-02-14 19:31:32 -0800 | [diff] [blame] | 1627 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
| 1628 | * these changes separately from I_DIRTY_SYNC so that we |
| 1629 | * don't have to write inode on fdatasync() when only |
| 1630 | * mtime has changed in it. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1631 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1632 | * I_NEW Serves as both a mutex and completion notification. |
| 1633 | * New inodes set I_NEW. If two processes both create |
| 1634 | * the same inode, one of them will release its inode and |
| 1635 | * wait for I_NEW to be released before returning. |
| 1636 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
| 1637 | * also cause waiting on I_NEW, without I_NEW actually |
| 1638 | * being set. find_inode() uses this to prevent returning |
| 1639 | * nearly-dead inodes. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1640 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
| 1641 | * is zero. I_FREEING must be set when I_WILL_FREE is |
| 1642 | * cleared. |
| 1643 | * I_FREEING Set when inode is about to be freed but still has dirty |
| 1644 | * pages or buffers attached or the inode itself is still |
| 1645 | * dirty. |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 1646 | * I_CLEAR Added by clear_inode(). In this state the inode is |
| 1647 | * clean and can be destroyed. Inode keeps I_FREEING. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1648 | * |
| 1649 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
| 1650 | * prohibited for many purposes. iget() must wait for |
| 1651 | * the inode to be completely released, then create it |
| 1652 | * anew. Other functions will just ignore such inodes, |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1653 | * if appropriate. I_NEW is used for waiting. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1654 | * |
Jan Kara | 169ebd9 | 2012-05-03 14:48:03 +0200 | [diff] [blame] | 1655 | * I_SYNC Writeback of inode is running. The bit is set during |
| 1656 | * data writeback, and cleared with a wakeup on the bit |
| 1657 | * address once it is done. The bit is also used to pin |
| 1658 | * the inode in memory for flusher thread. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1659 | * |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 1660 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
| 1661 | * |
| 1662 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). |
| 1663 | * |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1664 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1665 | */ |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1666 | #define I_DIRTY_SYNC (1 << 0) |
| 1667 | #define I_DIRTY_DATASYNC (1 << 1) |
| 1668 | #define I_DIRTY_PAGES (1 << 2) |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1669 | #define __I_NEW 3 |
| 1670 | #define I_NEW (1 << __I_NEW) |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1671 | #define I_WILL_FREE (1 << 4) |
| 1672 | #define I_FREEING (1 << 5) |
| 1673 | #define I_CLEAR (1 << 6) |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1674 | #define __I_SYNC 7 |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1675 | #define I_SYNC (1 << __I_SYNC) |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1676 | #define I_REFERENCED (1 << 8) |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 1677 | #define __I_DIO_WAKEUP 9 |
| 1678 | #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP) |
Al Viro | f4e0c30 | 2013-06-11 08:34:36 +0400 | [diff] [blame] | 1679 | #define I_LINKABLE (1 << 10) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
| 1681 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
| 1682 | |
| 1683 | extern void __mark_inode_dirty(struct inode *, int); |
| 1684 | static inline void mark_inode_dirty(struct inode *inode) |
| 1685 | { |
| 1686 | __mark_inode_dirty(inode, I_DIRTY); |
| 1687 | } |
| 1688 | |
| 1689 | static inline void mark_inode_dirty_sync(struct inode *inode) |
| 1690 | { |
| 1691 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
| 1692 | } |
| 1693 | |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 1694 | extern void inc_nlink(struct inode *inode); |
| 1695 | extern void drop_nlink(struct inode *inode); |
| 1696 | extern void clear_nlink(struct inode *inode); |
| 1697 | extern void set_nlink(struct inode *inode, unsigned int nlink); |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 1698 | |
| 1699 | static inline void inode_inc_link_count(struct inode *inode) |
| 1700 | { |
| 1701 | inc_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1702 | mark_inode_dirty(inode); |
| 1703 | } |
| 1704 | |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1705 | static inline void inode_dec_link_count(struct inode *inode) |
| 1706 | { |
| 1707 | drop_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1708 | mark_inode_dirty(inode); |
| 1709 | } |
| 1710 | |
Jean Noel Cordenner | 25ec56b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1711 | /** |
| 1712 | * inode_inc_iversion - increments i_version |
| 1713 | * @inode: inode that need to be updated |
| 1714 | * |
| 1715 | * Every time the inode is modified, the i_version field will be incremented. |
| 1716 | * The filesystem has to be mounted with i_version flag |
| 1717 | */ |
| 1718 | |
| 1719 | static inline void inode_inc_iversion(struct inode *inode) |
| 1720 | { |
| 1721 | spin_lock(&inode->i_lock); |
| 1722 | inode->i_version++; |
| 1723 | spin_unlock(&inode->i_lock); |
| 1724 | } |
| 1725 | |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1726 | enum file_time_flags { |
| 1727 | S_ATIME = 1, |
| 1728 | S_MTIME = 2, |
| 1729 | S_CTIME = 4, |
| 1730 | S_VERSION = 8, |
| 1731 | }; |
| 1732 | |
Al Viro | badcf2b | 2013-07-16 18:15:46 +0400 | [diff] [blame] | 1733 | extern void touch_atime(const struct path *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | static inline void file_accessed(struct file *file) |
| 1735 | { |
| 1736 | if (!(file->f_flags & O_NOATIME)) |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1737 | touch_atime(&file->f_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | } |
| 1739 | |
| 1740 | int sync_inode(struct inode *inode, struct writeback_control *wbc); |
Christoph Hellwig | c3765016 | 2010-10-06 10:48:20 +0200 | [diff] [blame] | 1741 | int sync_inode_metadata(struct inode *inode, int wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | struct file_system_type { |
| 1744 | const char *name; |
| 1745 | int fs_flags; |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1746 | #define FS_REQUIRES_DEV 1 |
| 1747 | #define FS_BINARY_MOUNTDATA 2 |
| 1748 | #define FS_HAS_SUBTYPE 4 |
Eric W. Biederman | 0c55cfc | 2012-07-26 21:42:03 -0700 | [diff] [blame] | 1749 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
| 1750 | #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */ |
David Howells | bbc1096 | 2012-10-15 16:40:35 +0100 | [diff] [blame] | 1751 | #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] | 1752 | struct dentry *(*mount) (struct file_system_type *, int, |
| 1753 | const char *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | void (*kill_sb) (struct super_block *); |
| 1755 | struct module *owner; |
| 1756 | struct file_system_type * next; |
Al Viro | a516616 | 2011-12-12 22:53:00 -0500 | [diff] [blame] | 1757 | struct hlist_head fs_supers; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1758 | |
Ingo Molnar | cf51624 | 2006-07-03 00:25:27 -0700 | [diff] [blame] | 1759 | struct lock_class_key s_lock_key; |
Arjan van de Ven | 897c6ff | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1760 | struct lock_class_key s_umount_key; |
Roland Dreier | 51ee049 | 2010-04-27 14:23:57 -0700 | [diff] [blame] | 1761 | struct lock_class_key s_vfs_rename_key; |
Jan Kara | 5accdf8 | 2012-06-12 16:20:34 +0200 | [diff] [blame] | 1762 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1763 | |
| 1764 | struct lock_class_key i_lock_key; |
| 1765 | struct lock_class_key i_mutex_key; |
Peter Zijlstra | 14358e6 | 2007-10-14 01:38:33 +0200 | [diff] [blame] | 1766 | struct lock_class_key i_mutex_dir_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | }; |
| 1768 | |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1769 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
| 1770 | |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 1771 | extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
| 1772 | void *data, int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1773 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
| 1774 | int flags, const char *dev_name, void *data, |
| 1775 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1776 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
| 1777 | int flags, void *data, |
| 1778 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1779 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
| 1780 | int flags, void *data, |
| 1781 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 1782 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | void generic_shutdown_super(struct super_block *sb); |
| 1784 | void kill_block_super(struct super_block *sb); |
| 1785 | void kill_anon_super(struct super_block *sb); |
| 1786 | void kill_litter_super(struct super_block *sb); |
| 1787 | void deactivate_super(struct super_block *sb); |
Al Viro | 74dbbdd | 2009-05-06 01:07:50 -0400 | [diff] [blame] | 1788 | void deactivate_locked_super(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | int set_anon_super(struct super_block *s, void *data); |
Al Viro | 0ee5dc6 | 2011-07-07 15:44:25 -0400 | [diff] [blame] | 1790 | int get_anon_bdev(dev_t *); |
| 1791 | void free_anon_bdev(dev_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | struct super_block *sget(struct file_system_type *type, |
| 1793 | int (*test)(struct super_block *,void *), |
| 1794 | int (*set)(struct super_block *,void *), |
David Howells | 9249e17 | 2012-06-25 12:55:37 +0100 | [diff] [blame] | 1795 | int flags, void *data); |
Al Viro | 51139ad | 2010-07-25 23:47:46 +0400 | [diff] [blame] | 1796 | extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
Al Viro | c74a1cb | 2011-01-12 16:59:34 -0500 | [diff] [blame] | 1797 | const struct super_operations *ops, |
| 1798 | const struct dentry_operations *dops, |
| 1799 | unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | |
| 1801 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
| 1802 | #define fops_get(fops) \ |
| 1803 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
| 1804 | #define fops_put(fops) \ |
| 1805 | do { if (fops) module_put((fops)->owner); } while(0) |
Al Viro | e84f9e5 | 2013-09-22 14:17:15 -0400 | [diff] [blame] | 1806 | /* |
| 1807 | * This one is to be used *ONLY* from ->open() instances. |
| 1808 | * fops must be non-NULL, pinned down *and* module dependencies |
| 1809 | * should be sufficient to pin the caller down as well. |
| 1810 | */ |
| 1811 | #define replace_fops(f, fops) \ |
| 1812 | do { \ |
| 1813 | struct file *__file = (f); \ |
| 1814 | fops_put(__file->f_op); \ |
| 1815 | BUG_ON(!(__file->f_op = (fops))); \ |
| 1816 | } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | |
| 1818 | extern int register_filesystem(struct file_system_type *); |
| 1819 | extern int unregister_filesystem(struct file_system_type *); |
Pavel Emelyanov | 8bf9725 | 2007-10-18 23:40:02 -0700 | [diff] [blame] | 1820 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
| 1821 | #define kern_mount(type) kern_mount_data(type, NULL) |
Tim Chen | 423e0ab | 2011-07-19 09:32:38 -0700 | [diff] [blame] | 1822 | extern void kern_unmount(struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | extern int may_umount_tree(struct vfsmount *); |
| 1824 | extern int may_umount(struct vfsmount *); |
Al Viro | 808d4e3 | 2012-10-11 11:42:01 -0400 | [diff] [blame] | 1825 | extern long do_mount(const char *, const char *, const char *, unsigned long, void *); |
Al Viro | 589ff87 | 2009-04-18 03:28:19 -0400 | [diff] [blame] | 1826 | extern struct vfsmount *collect_mounts(struct path *); |
Al Viro | 8aec080 | 2007-06-07 12:20:32 -0400 | [diff] [blame] | 1827 | extern void drop_collected_mounts(struct vfsmount *); |
Al Viro | 1f70713 | 2010-01-30 22:51:25 -0500 | [diff] [blame] | 1828 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
| 1829 | struct vfsmount *); |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 1830 | extern int vfs_statfs(struct path *, struct kstatfs *); |
Al Viro | c8b91ac | 2011-03-12 10:41:39 -0500 | [diff] [blame] | 1831 | extern int user_statfs(const char __user *, struct kstatfs *); |
| 1832 | extern int fd_statfs(int, struct kstatfs *); |
Al Viro | cf31e70 | 2012-01-02 22:28:36 -0500 | [diff] [blame] | 1833 | extern int vfs_ustat(dev_t, struct kstatfs *); |
Josef Bacik | 18e9e51 | 2010-03-23 10:34:56 -0400 | [diff] [blame] | 1834 | extern int freeze_super(struct super_block *super); |
| 1835 | extern int thaw_super(struct super_block *super); |
Al Viro | 02125a8 | 2011-12-05 08:43:34 -0500 | [diff] [blame] | 1836 | extern bool our_mnt(struct vfsmount *mnt); |
Eric W. Biederman | e51db73 | 2013-03-30 19:57:41 -0700 | [diff] [blame] | 1837 | extern bool fs_fully_visible(struct file_system_type *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 1839 | extern int current_umask(void); |
| 1840 | |
J. Bruce Fields | 5a14696 | 2012-08-28 07:50:40 -0700 | [diff] [blame] | 1841 | extern void ihold(struct inode * inode); |
| 1842 | extern void iput(struct inode *); |
| 1843 | |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 1844 | static inline struct inode *file_inode(struct file *f) |
| 1845 | { |
| 1846 | return f->f_inode; |
| 1847 | } |
| 1848 | |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 1849 | /* /sys/fs */ |
Greg Kroah-Hartman | 00d2666 | 2007-10-29 14:17:23 -0600 | [diff] [blame] | 1850 | extern struct kobject *fs_kobj; |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 1851 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 1852 | #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1853 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | #define FLOCK_VERIFY_READ 1 |
| 1855 | #define FLOCK_VERIFY_WRITE 2 |
| 1856 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1857 | #ifdef CONFIG_FILE_LOCKING |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 1858 | extern int locks_mandatory_locked(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
| 1860 | |
| 1861 | /* |
| 1862 | * Candidates for mandatory locking have the setgid bit set |
| 1863 | * but no group execute bit - an otherwise meaningless combination. |
| 1864 | */ |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1865 | |
| 1866 | static inline int __mandatory_lock(struct inode *ino) |
| 1867 | { |
| 1868 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
| 1869 | } |
| 1870 | |
| 1871 | /* |
| 1872 | * ... and these candidates should be on MS_MANDLOCK mounted fs, |
| 1873 | * otherwise these will be advisory locks |
| 1874 | */ |
| 1875 | |
| 1876 | static inline int mandatory_lock(struct inode *ino) |
| 1877 | { |
| 1878 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
| 1879 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 1881 | static inline int locks_verify_locked(struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | { |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 1883 | if (mandatory_lock(file_inode(file))) |
| 1884 | return locks_mandatory_locked(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | return 0; |
| 1886 | } |
| 1887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | static inline int locks_verify_truncate(struct inode *inode, |
| 1889 | struct file *filp, |
| 1890 | loff_t size) |
| 1891 | { |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1892 | if (inode->i_flock && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | return locks_mandatory_area( |
| 1894 | FLOCK_VERIFY_WRITE, inode, filp, |
| 1895 | size < inode->i_size ? size : inode->i_size, |
| 1896 | (size < inode->i_size ? inode->i_size - size |
| 1897 | : size - inode->i_size) |
| 1898 | ); |
| 1899 | return 0; |
| 1900 | } |
| 1901 | |
| 1902 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 1903 | { |
Jeff Layton | 24cbe78 | 2014-02-03 12:13:06 -0500 | [diff] [blame] | 1904 | /* |
| 1905 | * Since this check is lockless, we must ensure that any refcounts |
| 1906 | * taken are done before checking inode->i_flock. Otherwise, we could |
| 1907 | * end up racing with tasks trying to set a new lease on this file. |
| 1908 | */ |
| 1909 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | if (inode->i_flock) |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 1911 | return __break_lease(inode, mode, FL_LEASE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | return 0; |
| 1913 | } |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 1914 | |
| 1915 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
| 1916 | { |
| 1917 | if (inode->i_flock) |
| 1918 | return __break_lease(inode, mode, FL_DELEG); |
| 1919 | return 0; |
| 1920 | } |
| 1921 | |
J. Bruce Fields | 5a14696 | 2012-08-28 07:50:40 -0700 | [diff] [blame] | 1922 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
| 1923 | { |
| 1924 | int ret; |
| 1925 | |
| 1926 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); |
| 1927 | if (ret == -EWOULDBLOCK && delegated_inode) { |
| 1928 | *delegated_inode = inode; |
| 1929 | ihold(inode); |
| 1930 | } |
| 1931 | return ret; |
| 1932 | } |
| 1933 | |
| 1934 | static inline int break_deleg_wait(struct inode **delegated_inode) |
| 1935 | { |
| 1936 | int ret; |
| 1937 | |
| 1938 | ret = break_deleg(*delegated_inode, O_WRONLY); |
| 1939 | iput(*delegated_inode); |
| 1940 | *delegated_inode = NULL; |
| 1941 | return ret; |
| 1942 | } |
| 1943 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1944 | #else /* !CONFIG_FILE_LOCKING */ |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 1945 | static inline int locks_mandatory_locked(struct file *file) |
Steven Whitehouse | af5df56 | 2009-01-20 10:29:46 +0000 | [diff] [blame] | 1946 | { |
| 1947 | return 0; |
| 1948 | } |
| 1949 | |
| 1950 | static inline int locks_mandatory_area(int rw, struct inode *inode, |
| 1951 | struct file *filp, loff_t offset, |
| 1952 | size_t count) |
| 1953 | { |
| 1954 | return 0; |
| 1955 | } |
| 1956 | |
| 1957 | static inline int __mandatory_lock(struct inode *inode) |
| 1958 | { |
| 1959 | return 0; |
| 1960 | } |
| 1961 | |
| 1962 | static inline int mandatory_lock(struct inode *inode) |
| 1963 | { |
| 1964 | return 0; |
| 1965 | } |
| 1966 | |
Jeff Layton | d7a0698 | 2014-03-10 09:54:15 -0400 | [diff] [blame] | 1967 | static inline int locks_verify_locked(struct file *file) |
Steven Whitehouse | af5df56 | 2009-01-20 10:29:46 +0000 | [diff] [blame] | 1968 | { |
| 1969 | return 0; |
| 1970 | } |
| 1971 | |
| 1972 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
| 1973 | size_t size) |
| 1974 | { |
| 1975 | return 0; |
| 1976 | } |
| 1977 | |
| 1978 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 1979 | { |
| 1980 | return 0; |
| 1981 | } |
| 1982 | |
J. Bruce Fields | df4e8d2 | 2012-03-05 13:18:59 -0500 | [diff] [blame] | 1983 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
| 1984 | { |
| 1985 | return 0; |
| 1986 | } |
J. Bruce Fields | 5a14696 | 2012-08-28 07:50:40 -0700 | [diff] [blame] | 1987 | |
| 1988 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
| 1989 | { |
| 1990 | return 0; |
| 1991 | } |
| 1992 | |
| 1993 | static inline int break_deleg_wait(struct inode **delegated_inode) |
| 1994 | { |
| 1995 | BUG(); |
| 1996 | return 0; |
| 1997 | } |
| 1998 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1999 | #endif /* CONFIG_FILE_LOCKING */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | |
| 2001 | /* fs/open.c */ |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 2002 | struct audit_names; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2003 | struct filename { |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 2004 | const char *name; /* pointer to actual string */ |
| 2005 | const __user char *uptr; /* original userland pointer */ |
| 2006 | struct audit_names *aname; |
Jeff Layton | 7950e38 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 2007 | bool separate; /* should "name" be freed? */ |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2008 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 2010 | extern long vfs_truncate(struct path *, loff_t); |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 2011 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
| 2012 | struct file *filp); |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 2013 | extern int do_fallocate(struct file *file, int mode, loff_t offset, |
| 2014 | loff_t len); |
Jason Uhlenkott | 8e8a140 | 2007-10-20 03:16:18 +0200 | [diff] [blame] | 2015 | 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] | 2016 | umode_t mode); |
Jeff Layton | 669abf4 | 2012-10-10 16:43:10 -0400 | [diff] [blame] | 2017 | extern struct file *file_open_name(struct filename *, int, umode_t); |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 2018 | extern struct file *filp_open(const char *, int, umode_t); |
Al Viro | 73d049a | 2011-03-11 12:08:24 -0500 | [diff] [blame] | 2019 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
| 2020 | const char *, int); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 2021 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | extern int filp_close(struct file *, fl_owner_t id); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2023 | |
| 2024 | extern struct filename *getname(const char __user *); |
Linus Torvalds | c4ad8f9 | 2014-02-05 12:54:53 -0800 | [diff] [blame] | 2025 | extern struct filename *getname_kernel(const char *); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2026 | |
Al Viro | 4723768 | 2012-06-10 05:01:45 -0400 | [diff] [blame] | 2027 | enum { |
| 2028 | FILE_CREATED = 1, |
| 2029 | FILE_OPENED = 2 |
| 2030 | }; |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 2031 | extern int finish_open(struct file *file, struct dentry *dentry, |
| 2032 | int (*open)(struct inode *, struct file *), |
| 2033 | int *opened); |
Al Viro | e45198a | 2012-06-10 06:48:09 -0400 | [diff] [blame] | 2034 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 2036 | /* fs/ioctl.c */ |
| 2037 | |
| 2038 | extern int ioctl_preallocate(struct file *filp, void __user *argp); |
| 2039 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | /* fs/dcache.c */ |
| 2041 | extern void __init vfs_caches_init_early(void); |
| 2042 | extern void __init vfs_caches_init(unsigned long); |
| 2043 | |
Christoph Lameter | b86c089 | 2006-12-06 20:32:57 -0800 | [diff] [blame] | 2044 | extern struct kmem_cache *names_cachep; |
| 2045 | |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2046 | extern void final_putname(struct filename *name); |
| 2047 | |
Jeff Layton | a608ca2 | 2012-10-10 15:25:26 -0400 | [diff] [blame] | 2048 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
Vegard Nossum | 3446a8a | 2009-05-16 11:22:14 +0200 | [diff] [blame] | 2049 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | #ifndef CONFIG_AUDITSYSCALL |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2051 | #define putname(name) final_putname(name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | #else |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 2053 | extern void putname(struct filename *name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | #endif |
| 2055 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2056 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | extern int register_blkdev(unsigned int, const char *); |
Akinobu Mita | f448024 | 2007-07-17 04:03:47 -0700 | [diff] [blame] | 2058 | extern void unregister_blkdev(unsigned int, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | extern struct block_device *bdget(dev_t); |
Alan Jenkins | dddac6a | 2009-07-29 21:07:55 +0200 | [diff] [blame] | 2060 | extern struct block_device *bdgrab(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | extern void bd_set_size(struct block_device *, loff_t size); |
| 2062 | extern void bd_forget(struct inode *inode); |
| 2063 | extern void bdput(struct block_device *); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2064 | extern void invalidate_bdev(struct block_device *); |
Jan Kara | 5c0d6b6 | 2012-07-03 16:45:31 +0200 | [diff] [blame] | 2065 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2066 | extern int sync_blockdev(struct block_device *bdev); |
Al Viro | ff01bb4 | 2011-09-16 02:31:11 -0400 | [diff] [blame] | 2067 | extern void kill_bdev(struct block_device *); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2068 | extern struct super_block *freeze_bdev(struct block_device *); |
Eric Sandeen | c2d7543 | 2009-03-31 15:23:46 -0700 | [diff] [blame] | 2069 | extern void emergency_thaw_all(void); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2070 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
| 2071 | extern int fsync_bdev(struct block_device *); |
Jan Kara | a885599 | 2013-07-09 22:36:45 +0800 | [diff] [blame] | 2072 | extern int sb_is_blkdev_sb(struct super_block *sb); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2073 | #else |
| 2074 | static inline void bd_forget(struct inode *inode) {} |
Al Viro | 47e4491 | 2009-04-01 07:07:16 -0400 | [diff] [blame] | 2075 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
Al Viro | ff01bb4 | 2011-09-16 02:31:11 -0400 | [diff] [blame] | 2076 | static inline void kill_bdev(struct block_device *bdev) {} |
Al Viro | 47e4491 | 2009-04-01 07:07:16 -0400 | [diff] [blame] | 2077 | static inline void invalidate_bdev(struct block_device *bdev) {} |
| 2078 | |
| 2079 | static inline struct super_block *freeze_bdev(struct block_device *sb) |
| 2080 | { |
| 2081 | return NULL; |
| 2082 | } |
| 2083 | |
| 2084 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
| 2085 | { |
| 2086 | return 0; |
| 2087 | } |
Jan Kara | 5c0d6b6 | 2012-07-03 16:45:31 +0200 | [diff] [blame] | 2088 | |
| 2089 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) |
| 2090 | { |
| 2091 | } |
Jan Kara | a885599 | 2013-07-09 22:36:45 +0800 | [diff] [blame] | 2092 | |
| 2093 | static inline int sb_is_blkdev_sb(struct super_block *sb) |
| 2094 | { |
| 2095 | return 0; |
| 2096 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2097 | #endif |
Jan Kara | 60b0680 | 2009-04-27 16:43:53 +0200 | [diff] [blame] | 2098 | extern int sync_filesystem(struct super_block *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2099 | extern const struct file_operations def_blk_fops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2100 | extern const struct file_operations def_chr_fops; |
| 2101 | extern const struct file_operations bad_sock_fops; |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2102 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
Al Viro | 56b26ad | 2008-09-19 03:17:36 -0400 | [diff] [blame] | 2104 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2106 | 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] | 2107 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
| 2108 | void *holder); |
| 2109 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, |
| 2110 | void *holder); |
Al Viro | 4385bab | 2013-05-05 22:11:03 -0400 | [diff] [blame] | 2111 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2112 | #ifdef CONFIG_SYSFS |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2113 | 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] | 2114 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
| 2115 | struct gendisk *disk); |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2116 | #else |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2117 | static inline int bd_link_disk_holder(struct block_device *bdev, |
| 2118 | struct gendisk *disk) |
| 2119 | { |
| 2120 | return 0; |
| 2121 | } |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 2122 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
| 2123 | struct gendisk *disk) |
| 2124 | { |
| 2125 | } |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2126 | #endif |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2127 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | |
| 2129 | /* fs/char_dev.c */ |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2130 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
| 2132 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
Tejun Heo | 1905b1b | 2009-08-06 18:13:23 +0900 | [diff] [blame] | 2133 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
| 2134 | unsigned int count, const char *name, |
| 2135 | const struct file_operations *fops); |
| 2136 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
| 2137 | unsigned int count, const char *name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | extern void unregister_chrdev_region(dev_t, unsigned); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2139 | extern void chrdev_show(struct seq_file *,off_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | |
Tejun Heo | 1905b1b | 2009-08-06 18:13:23 +0900 | [diff] [blame] | 2141 | static inline int register_chrdev(unsigned int major, const char *name, |
| 2142 | const struct file_operations *fops) |
| 2143 | { |
| 2144 | return __register_chrdev(major, 0, 256, name, fops); |
| 2145 | } |
| 2146 | |
| 2147 | static inline void unregister_chrdev(unsigned int major, const char *name) |
| 2148 | { |
| 2149 | __unregister_chrdev(major, 0, 256, name); |
| 2150 | } |
| 2151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | /* fs/block_dev.c */ |
| 2153 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 2154 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2155 | |
| 2156 | #ifdef CONFIG_BLOCK |
| 2157 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | extern const char *__bdevname(dev_t, char *buffer); |
| 2159 | extern const char *bdevname(struct block_device *bdev, char *buffer); |
| 2160 | extern struct block_device *lookup_bdev(const char *); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2161 | extern void blkdev_show(struct seq_file *,off_t); |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 2162 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2163 | #else |
| 2164 | #define BLKDEV_MAJOR_HASH_SIZE 0 |
| 2165 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | |
| 2167 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
| 2168 | |
| 2169 | /* Invalid inode operations -- fs/bad_inode.c */ |
| 2170 | extern void make_bad_inode(struct inode *); |
| 2171 | extern int is_bad_inode(struct inode *); |
| 2172 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2173 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | /* |
| 2175 | * return READ, READA, or WRITE |
| 2176 | */ |
| 2177 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
| 2178 | |
| 2179 | /* |
| 2180 | * return data direction, READ or WRITE |
| 2181 | */ |
| 2182 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
| 2183 | |
Andrew Patterson | c3279d1 | 2008-09-04 14:27:25 -0600 | [diff] [blame] | 2184 | extern void check_disk_size_change(struct gendisk *disk, |
| 2185 | struct block_device *bdev); |
Andrew Patterson | 0c002c2 | 2008-09-04 14:27:20 -0600 | [diff] [blame] | 2186 | extern int revalidate_disk(struct gendisk *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | extern int check_disk_change(struct block_device *); |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 2188 | extern int __invalidate_device(struct block_device *, bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | extern int invalidate_partition(struct gendisk *, int); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2190 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
| 2192 | pgoff_t start, pgoff_t end); |
Anton Altaparmakov | 54bc485 | 2007-02-10 01:45:38 -0800 | [diff] [blame] | 2193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | static inline void invalidate_remote_inode(struct inode *inode) |
| 2195 | { |
| 2196 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 2197 | S_ISLNK(inode->i_mode)) |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 2198 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | } |
| 2200 | extern int invalidate_inode_pages2(struct address_space *mapping); |
| 2201 | extern int invalidate_inode_pages2_range(struct address_space *mapping, |
| 2202 | pgoff_t start, pgoff_t end); |
| 2203 | extern int write_inode_now(struct inode *, int); |
| 2204 | extern int filemap_fdatawrite(struct address_space *); |
| 2205 | extern int filemap_flush(struct address_space *); |
| 2206 | extern int filemap_fdatawait(struct address_space *); |
Jan Kara | d3bccb6f | 2009-08-17 19:30:27 +0200 | [diff] [blame] | 2207 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
| 2208 | loff_t lend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | extern int filemap_write_and_wait(struct address_space *mapping); |
| 2210 | extern int filemap_write_and_wait_range(struct address_space *mapping, |
| 2211 | loff_t lstart, loff_t lend); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2212 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
| 2213 | loff_t start, loff_t end, int sync_mode); |
Jan Kara | f4c0a0f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2214 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
| 2215 | loff_t start, loff_t end); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2216 | |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 2217 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
| 2218 | int datasync); |
| 2219 | extern int vfs_fsync(struct file *file, int datasync); |
Al Viro | d311d79 | 2014-02-09 15:18:09 -0500 | [diff] [blame] | 2220 | static inline int generic_write_sync(struct file *file, loff_t pos, loff_t count) |
| 2221 | { |
| 2222 | if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host)) |
| 2223 | return 0; |
| 2224 | return vfs_fsync_range(file, pos, pos + count - 1, |
| 2225 | (file->f_flags & __O_SYNC) ? 0 : 1); |
| 2226 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | extern void emergency_sync(void); |
| 2228 | extern void emergency_remount(void); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2229 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | extern sector_t bmap(struct inode *, sector_t); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2231 | #endif |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 2232 | extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2233 | extern int inode_permission(struct inode *, int); |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 2234 | extern int generic_permission(struct inode *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | |
Miklos Szeredi | f696a36 | 2008-07-31 13:41:58 +0200 | [diff] [blame] | 2236 | static inline bool execute_ok(struct inode *inode) |
| 2237 | { |
| 2238 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
| 2239 | } |
| 2240 | |
Al Viro | 8d71db4 | 2013-03-19 21:01:03 -0400 | [diff] [blame] | 2241 | static inline void file_start_write(struct file *file) |
| 2242 | { |
| 2243 | if (!S_ISREG(file_inode(file)->i_mode)) |
| 2244 | return; |
| 2245 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); |
| 2246 | } |
| 2247 | |
Jan Kara | 5ae98f1 | 2013-05-04 00:11:23 +0200 | [diff] [blame] | 2248 | static inline bool file_start_write_trylock(struct file *file) |
| 2249 | { |
| 2250 | if (!S_ISREG(file_inode(file)->i_mode)) |
| 2251 | return true; |
| 2252 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); |
| 2253 | } |
| 2254 | |
Al Viro | 8d71db4 | 2013-03-19 21:01:03 -0400 | [diff] [blame] | 2255 | static inline void file_end_write(struct file *file) |
| 2256 | { |
| 2257 | if (!S_ISREG(file_inode(file)->i_mode)) |
| 2258 | return; |
| 2259 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); |
| 2260 | } |
| 2261 | |
Al Viro | 07b8ce1 | 2011-06-20 10:52:57 -0400 | [diff] [blame] | 2262 | /* |
| 2263 | * get_write_access() gets write permission for a file. |
| 2264 | * put_write_access() releases this write permission. |
| 2265 | * This is used for regular files. |
| 2266 | * We cannot support write (and maybe mmap read-write shared) accesses and |
| 2267 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode |
| 2268 | * can have the following values: |
| 2269 | * 0: no writers, no VM_DENYWRITE mappings |
| 2270 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist |
| 2271 | * > 0: (i_writecount) users are writing to the file. |
| 2272 | * |
| 2273 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe |
| 2274 | * except for the cases where we don't hold i_writecount yet. Then we need to |
| 2275 | * use {get,deny}_write_access() - these functions check the sign and refuse |
| 2276 | * to do the change if sign is wrong. |
| 2277 | */ |
| 2278 | static inline int get_write_access(struct inode *inode) |
| 2279 | { |
| 2280 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; |
| 2281 | } |
| 2282 | static inline int deny_write_access(struct file *file) |
| 2283 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2284 | struct inode *inode = file_inode(file); |
Al Viro | 07b8ce1 | 2011-06-20 10:52:57 -0400 | [diff] [blame] | 2285 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
| 2286 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | static inline void put_write_access(struct inode * inode) |
| 2288 | { |
| 2289 | atomic_dec(&inode->i_writecount); |
| 2290 | } |
| 2291 | static inline void allow_write_access(struct file *file) |
| 2292 | { |
| 2293 | if (file) |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2294 | atomic_inc(&file_inode(file)->i_writecount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | } |
David Howells | f1fe29b | 2013-09-27 11:20:03 +0100 | [diff] [blame] | 2296 | static inline bool inode_is_open_for_write(const struct inode *inode) |
| 2297 | { |
| 2298 | return atomic_read(&inode->i_writecount) > 0; |
| 2299 | } |
| 2300 | |
Mimi Zohar | a5c96eb | 2010-11-02 10:11:37 -0400 | [diff] [blame] | 2301 | #ifdef CONFIG_IMA |
| 2302 | static inline void i_readcount_dec(struct inode *inode) |
| 2303 | { |
| 2304 | BUG_ON(!atomic_read(&inode->i_readcount)); |
| 2305 | atomic_dec(&inode->i_readcount); |
| 2306 | } |
| 2307 | static inline void i_readcount_inc(struct inode *inode) |
| 2308 | { |
| 2309 | atomic_inc(&inode->i_readcount); |
| 2310 | } |
| 2311 | #else |
| 2312 | static inline void i_readcount_dec(struct inode *inode) |
| 2313 | { |
| 2314 | return; |
| 2315 | } |
| 2316 | static inline void i_readcount_inc(struct inode *inode) |
| 2317 | { |
| 2318 | return; |
| 2319 | } |
| 2320 | #endif |
Ulrich Drepper | ed8cae8 | 2008-07-23 21:29:30 -0700 | [diff] [blame] | 2321 | extern int do_pipe_flags(int *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | |
Mimi Zohar | 6777d77 | 2009-08-21 14:32:48 -0400 | [diff] [blame] | 2323 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
Al Viro | 7bb307e | 2013-02-23 14:51:48 -0500 | [diff] [blame] | 2324 | 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] | 2325 | extern struct file * open_exec(const char *); |
| 2326 | |
| 2327 | /* fs/dcache.c -- generic fs support functions */ |
| 2328 | extern int is_subdir(struct dentry *, struct dentry *); |
Al Viro | 2096f75 | 2010-01-30 13:16:21 -0500 | [diff] [blame] | 2329 | extern int path_is_under(struct path *, struct path *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | |
| 2331 | #include <linux/err.h> |
| 2332 | |
| 2333 | /* needed for stackable file system support */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2334 | 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] | 2335 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2336 | 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] | 2337 | |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 2338 | extern int inode_init_always(struct super_block *, struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2339 | extern void inode_init_once(struct inode *); |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 2340 | extern void address_space_init_once(struct address_space *mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | extern struct inode * igrab(struct inode *); |
| 2342 | extern ino_t iunique(struct super_block *, ino_t); |
| 2343 | extern int inode_needs_sync(struct inode *inode); |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 2344 | extern int generic_delete_inode(struct inode *inode); |
Al Viro | 9bcb4b7 | 2012-02-12 19:43:17 -0500 | [diff] [blame] | 2345 | static inline int generic_drop_inode(struct inode *inode) |
| 2346 | { |
| 2347 | return !inode->i_nlink || inode_unhashed(inode); |
| 2348 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 2350 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
| 2351 | unsigned long hashval, int (*test)(struct inode *, void *), |
| 2352 | void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
| 2354 | int (*test)(struct inode *, void *), void *data); |
| 2355 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
| 2356 | |
| 2357 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
| 2358 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 2359 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
| 2360 | extern int insert_inode_locked(struct inode *); |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 2361 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 2362 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); |
| 2363 | #else |
| 2364 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; |
| 2365 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | extern void unlock_new_inode(struct inode *); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 2367 | extern unsigned int get_next_ino(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | extern void __iget(struct inode * inode); |
David Howells | b46980f | 2008-02-07 00:15:27 -0800 | [diff] [blame] | 2370 | extern void iget_failed(struct inode *); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 2371 | extern void clear_inode(struct inode *); |
Christoph Hellwig | 2e00c97 | 2009-08-07 14:38:29 -0300 | [diff] [blame] | 2372 | extern void __destroy_inode(struct inode *); |
Eric Dumazet | a209dfc | 2011-07-26 11:36:34 +0200 | [diff] [blame] | 2373 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
| 2374 | extern struct inode *new_inode(struct super_block *sb); |
Nick Piggin | ff0c7d1 | 2011-01-07 17:49:50 +1100 | [diff] [blame] | 2375 | extern void free_inode_nonrcu(struct inode *inode); |
Jens Axboe | 01de85e | 2006-10-17 19:50:36 +0200 | [diff] [blame] | 2376 | extern int should_remove_suid(struct dentry *); |
Miklos Szeredi | 2f1936b | 2008-06-24 16:50:14 +0200 | [diff] [blame] | 2377 | extern int file_remove_suid(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | |
| 2379 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 2380 | static inline void insert_inode_hash(struct inode *inode) |
| 2381 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | __insert_inode_hash(inode, inode->i_ino); |
| 2383 | } |
Eric Dumazet | f2ee7ab | 2011-07-28 06:41:09 +0200 | [diff] [blame] | 2384 | |
| 2385 | extern void __remove_inode_hash(struct inode *); |
| 2386 | static inline void remove_inode_hash(struct inode *inode) |
| 2387 | { |
| 2388 | if (!inode_unhashed(inode)) |
| 2389 | __remove_inode_hash(inode); |
| 2390 | } |
| 2391 | |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 2392 | extern void inode_sb_list_add(struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2394 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | extern void submit_bio(int, struct bio *); |
| 2396 | extern int bdev_read_only(struct block_device *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2397 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | extern int set_blocksize(struct block_device *, int); |
| 2399 | extern int sb_set_blocksize(struct super_block *, int); |
| 2400 | extern int sb_min_blocksize(struct super_block *, int); |
| 2401 | |
| 2402 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
| 2403 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
Konstantin Khlebnikov | 0b173bc | 2012-10-08 16:28:46 -0700 | [diff] [blame] | 2404 | extern int generic_file_remap_pages(struct vm_area_struct *, unsigned long addr, |
| 2405 | unsigned long size, pgoff_t pgoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 2407 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
Al Viro | 41fc56d | 2014-02-09 12:58:52 -0500 | [diff] [blame] | 2408 | extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 2409 | extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
Al Viro | 5cb6c6c | 2014-02-11 20:58:20 -0500 | [diff] [blame] | 2411 | unsigned long *, loff_t, size_t, size_t); |
Al Viro | 3b93f91 | 2014-02-11 21:34:08 -0500 | [diff] [blame] | 2412 | extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); |
| 2414 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); |
Dmitriy Monakhov | 0ceb331 | 2007-05-08 00:23:02 -0700 | [diff] [blame] | 2415 | extern int generic_segment_checks(const struct iovec *iov, |
| 2416 | unsigned long *nr_segs, size_t *count, int access_flags); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2417 | |
Christoph Hellwig | eef9938 | 2009-08-20 17:43:41 +0200 | [diff] [blame] | 2418 | /* fs/block_dev.c */ |
| 2419 | extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 2420 | unsigned long nr_segs, loff_t pos); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2421 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
| 2422 | int datasync); |
Al Viro | ff01bb4 | 2011-09-16 02:31:11 -0400 | [diff] [blame] | 2423 | extern void block_sync_page(struct page *page); |
Christoph Hellwig | eef9938 | 2009-08-20 17:43:41 +0200 | [diff] [blame] | 2424 | |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2425 | /* fs/splice.c */ |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2426 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2427 | struct pipe_inode_info *, size_t, unsigned int); |
Miklos Szeredi | 6818173 | 2009-05-07 15:37:36 +0200 | [diff] [blame] | 2428 | extern ssize_t default_file_splice_read(struct file *, loff_t *, |
| 2429 | struct pipe_inode_info *, size_t, unsigned int); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2430 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2431 | struct file *, loff_t *, size_t, unsigned int); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2432 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2433 | struct file *out, loff_t *, size_t len, unsigned int flags); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | extern void |
| 2436 | 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] | 2437 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
| 2438 | 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] | 2439 | 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] | 2440 | 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] | 2441 | 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] | 2442 | int whence, loff_t maxsize, loff_t eof); |
Al Viro | 1bf9d14 | 2013-06-16 20:27:42 +0400 | [diff] [blame] | 2443 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
| 2444 | int whence, loff_t size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | extern int generic_file_open(struct inode * inode, struct file * filp); |
| 2446 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
| 2447 | |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2448 | #ifdef CONFIG_FS_XIP |
Carsten Otte | eb6fe0c | 2005-06-23 22:05:28 -0700 | [diff] [blame] | 2449 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
| 2450 | loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2451 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
Carsten Otte | eb6fe0c | 2005-06-23 22:05:28 -0700 | [diff] [blame] | 2452 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
| 2453 | size_t len, loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2454 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 2455 | #else |
| 2456 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
| 2457 | { |
| 2458 | return 0; |
| 2459 | } |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2460 | #endif |
| 2461 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2462 | #ifdef CONFIG_BLOCK |
Josef Bacik | facd07b | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 2463 | typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
| 2464 | loff_t file_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | |
| 2466 | enum { |
Christoph Hellwig | 1e431f5 | 2009-11-03 16:44:53 +0100 | [diff] [blame] | 2467 | /* need locking between buffered and direct access */ |
| 2468 | DIO_LOCKING = 0x01, |
| 2469 | |
| 2470 | /* filesystem does not support filling holes */ |
| 2471 | DIO_SKIP_HOLES = 0x02, |
Christoph Hellwig | 6039257 | 2014-02-10 10:27:11 +1100 | [diff] [blame] | 2472 | |
| 2473 | /* filesystem can handle aio writes beyond i_size */ |
| 2474 | DIO_ASYNC_EXTEND = 0x04, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | }; |
| 2476 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 2477 | void dio_end_io(struct bio *bio, int error); |
npiggin@suse.de | 7bb46a6 | 2010-05-27 01:05:33 +1000 | [diff] [blame] | 2478 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 2479 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
| 2480 | struct block_device *bdev, const struct iovec *iov, loff_t offset, |
| 2481 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
| 2482 | dio_submit_t submit_io, int flags); |
| 2483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
Christoph Hellwig | aacfc19c | 2011-06-24 14:29:47 -0400 | [diff] [blame] | 2485 | struct inode *inode, const struct iovec *iov, loff_t offset, |
| 2486 | unsigned long nr_segs, get_block_t get_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | { |
Christoph Hellwig | aacfc19c | 2011-06-24 14:29:47 -0400 | [diff] [blame] | 2488 | return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
| 2489 | offset, nr_segs, get_block, NULL, NULL, |
Christoph Hellwig | 1e431f5 | 2009-11-03 16:44:53 +0100 | [diff] [blame] | 2490 | DIO_LOCKING | DIO_SKIP_HOLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2492 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | |
Trond Myklebust | 1d59d61 | 2012-05-31 12:22:33 -0400 | [diff] [blame] | 2494 | void inode_dio_wait(struct inode *inode); |
| 2495 | void inode_dio_done(struct inode *inode); |
| 2496 | |
Theodore Ts'o | 5f16f32 | 2014-03-24 14:43:12 -0400 | [diff] [blame] | 2497 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
| 2498 | unsigned int mask); |
| 2499 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2500 | extern const struct file_operations generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | |
| 2502 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
| 2503 | |
Al Viro | 5d826c8 | 2014-03-14 13:42:45 -0400 | [diff] [blame] | 2504 | extern int readlink_copy(char __user *, int, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | extern int page_readlink(struct dentry *, char __user *, int); |
Linus Torvalds | cc314ee | 2005-08-19 18:02:56 -0700 | [diff] [blame] | 2506 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
| 2507 | extern void page_put_link(struct dentry *, struct nameidata *, void *); |
Kirill Korotaev | 0adb25d | 2006-03-11 03:27:13 -0800 | [diff] [blame] | 2508 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 2509 | int nofs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2510 | 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] | 2511 | extern const struct inode_operations page_symlink_inode_operations; |
Al Viro | 87dc800 | 2013-09-16 10:30:04 -0400 | [diff] [blame] | 2512 | extern void kfree_put_link(struct dentry *, struct nameidata *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2513 | extern int generic_readlink(struct dentry *, char __user *, int); |
| 2514 | extern void generic_fillattr(struct inode *, struct kstat *); |
J. Bruce Fields | b7a6ec5 | 2013-10-02 17:01:18 -0400 | [diff] [blame] | 2515 | int vfs_getattr_nosec(struct path *path, struct kstat *stat); |
Al Viro | 3dadecc | 2013-01-24 02:18:08 -0500 | [diff] [blame] | 2516 | extern int vfs_getattr(struct path *, struct kstat *); |
Dmitry Monakhov | b462707 | 2009-12-14 15:21:12 +0300 | [diff] [blame] | 2517 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2518 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
Jan Kara | 1c8924e | 2013-08-17 09:32:32 -0400 | [diff] [blame] | 2519 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2520 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
| 2521 | loff_t inode_get_bytes(struct inode *inode); |
| 2522 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
| 2523 | |
| 2524 | extern int vfs_readdir(struct file *, filldir_t, void *); |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 2525 | extern int iterate_dir(struct file *, struct dir_context *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 2527 | extern int vfs_stat(const char __user *, struct kstat *); |
| 2528 | extern int vfs_lstat(const char __user *, struct kstat *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2529 | extern int vfs_fstat(unsigned int, struct kstat *); |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 2530 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2531 | |
Erez Zadok | deb21db | 2008-02-07 00:13:25 -0800 | [diff] [blame] | 2532 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
| 2533 | unsigned long arg); |
Steven Whitehouse | e9079cc | 2008-10-14 14:43:29 +0100 | [diff] [blame] | 2534 | extern int __generic_block_fiemap(struct inode *inode, |
Josef Bacik | 3a3076f | 2010-04-23 12:17:17 -0400 | [diff] [blame] | 2535 | struct fiemap_extent_info *fieinfo, |
| 2536 | loff_t start, loff_t len, |
| 2537 | get_block_t *get_block); |
Josef Bacik | 68c9d70 | 2008-10-03 17:32:43 -0400 | [diff] [blame] | 2538 | extern int generic_block_fiemap(struct inode *inode, |
| 2539 | struct fiemap_extent_info *fieinfo, u64 start, |
| 2540 | u64 len, get_block_t *get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2541 | |
Miklos Szeredi | c18479f | 2007-10-18 23:39:11 -0700 | [diff] [blame] | 2542 | extern void get_filesystem(struct file_system_type *fs); |
| 2543 | extern void put_filesystem(struct file_system_type *fs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2544 | extern struct file_system_type *get_fs_type(const char *name); |
| 2545 | extern struct super_block *get_super(struct block_device *); |
Jan Kara | 6b6dc83 | 2012-02-10 11:03:00 +0100 | [diff] [blame] | 2546 | extern struct super_block *get_super_thawed(struct block_device *); |
Christoph Hellwig | 4504230 | 2009-08-03 23:28:35 +0200 | [diff] [blame] | 2547 | extern struct super_block *get_active_super(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2548 | extern void drop_super(struct super_block *sb); |
Al Viro | 01a05b3 | 2010-03-23 06:06:58 -0400 | [diff] [blame] | 2549 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
Al Viro | 43e15cd | 2011-06-03 20:16:57 -0400 | [diff] [blame] | 2550 | extern void iterate_supers_type(struct file_system_type *, |
| 2551 | void (*)(struct super_block *, void *), void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2552 | |
| 2553 | extern int dcache_dir_open(struct inode *, struct file *); |
| 2554 | extern int dcache_dir_close(struct inode *, struct file *); |
| 2555 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
Al Viro | 5f99f4e | 2013-05-15 20:23:06 -0400 | [diff] [blame] | 2556 | extern int dcache_readdir(struct file *, struct dir_context *); |
npiggin@suse.de | 7bb46a6 | 2010-05-27 01:05:33 +1000 | [diff] [blame] | 2557 | extern int simple_setattr(struct dentry *, struct iattr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2558 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2559 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
Stephen Boyd | 20955e8 | 2012-04-05 14:25:09 -0700 | [diff] [blame] | 2560 | extern int simple_open(struct inode *inode, struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2561 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
| 2562 | extern int simple_unlink(struct inode *, struct dentry *); |
| 2563 | extern int simple_rmdir(struct inode *, struct dentry *); |
| 2564 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2565 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | extern int simple_empty(struct dentry *); |
| 2567 | extern int simple_readpage(struct file *file, struct page *page); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 2568 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
| 2569 | loff_t pos, unsigned len, unsigned flags, |
| 2570 | struct page **pagep, void **fsdata); |
| 2571 | extern int simple_write_end(struct file *file, struct address_space *mapping, |
| 2572 | loff_t pos, unsigned len, unsigned copied, |
| 2573 | struct page *page, void *fsdata); |
Al Viro | b26d4cd | 2013-10-25 18:47:37 -0400 | [diff] [blame] | 2574 | extern int always_delete_dentry(const struct dentry *); |
Al Viro | 6987843 | 2013-10-02 22:35:11 -0400 | [diff] [blame] | 2575 | extern struct inode *alloc_anon_inode(struct super_block *); |
Al Viro | b26d4cd | 2013-10-25 18:47:37 -0400 | [diff] [blame] | 2576 | extern const struct dentry_operations simple_dentry_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 2578 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | 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] | 2580 | extern const struct file_operations simple_dir_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2581 | extern const struct inode_operations simple_dir_inode_operations; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2582 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | struct dentry *d_alloc_name(struct dentry *, const char *); |
Roberto Sassu | 7d683a0 | 2010-06-03 11:58:28 +0200 | [diff] [blame] | 2584 | 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] | 2585 | 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] | 2586 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
| 2587 | |
Akinobu Mita | 93b0711 | 2008-06-05 22:46:21 -0700 | [diff] [blame] | 2588 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
| 2589 | loff_t *ppos, const void *from, size_t available); |
Jiri Slaby | 6a727b4 | 2010-05-01 23:51:22 +0200 | [diff] [blame] | 2590 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
| 2591 | const void __user *from, size_t count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2593 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
Al Viro | d5aacad | 2009-06-07 14:56:44 -0400 | [diff] [blame] | 2594 | |
Patrick J. LoPresti | 30ca22c | 2010-07-22 15:03:41 -0700 | [diff] [blame] | 2595 | extern int generic_check_addressable(unsigned, u64); |
| 2596 | |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2597 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 2598 | extern int buffer_migrate_page(struct address_space *, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 2599 | struct page *, struct page *, |
| 2600 | enum migrate_mode); |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2601 | #else |
| 2602 | #define buffer_migrate_page NULL |
| 2603 | #endif |
| 2604 | |
npiggin@suse.de | 25d9e2d | 2009-08-21 02:35:05 +1000 | [diff] [blame] | 2605 | extern int inode_change_ok(const struct inode *, struct iattr *); |
| 2606 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
Christoph Hellwig | 6a1a90a | 2010-06-04 11:30:00 +0200 | [diff] [blame] | 2607 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 2609 | extern int file_update_time(struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2610 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 2611 | extern int generic_show_options(struct seq_file *m, struct dentry *root); |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 2612 | extern void save_mount_options(struct super_block *sb, char *options); |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 2613 | extern void replace_mount_options(struct super_block *sb, char *options); |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 2614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | static inline ino_t parent_ino(struct dentry *dentry) |
| 2616 | { |
| 2617 | ino_t res; |
| 2618 | |
Nick Piggin | b5c84bf | 2011-01-07 17:49:38 +1100 | [diff] [blame] | 2619 | /* |
| 2620 | * Don't strictly need d_lock here? If the parent ino could change |
| 2621 | * then surely we'd have a deeper race in the caller? |
| 2622 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | spin_lock(&dentry->d_lock); |
| 2624 | res = dentry->d_parent->d_inode->i_ino; |
| 2625 | spin_unlock(&dentry->d_lock); |
| 2626 | return res; |
| 2627 | } |
| 2628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | /* Transaction based IO helpers */ |
| 2630 | |
| 2631 | /* |
| 2632 | * An argresp is stored in an allocated page and holds the |
| 2633 | * size of the argument or response, along with its content |
| 2634 | */ |
| 2635 | struct simple_transaction_argresp { |
| 2636 | ssize_t size; |
| 2637 | char data[0]; |
| 2638 | }; |
| 2639 | |
| 2640 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
| 2641 | |
| 2642 | char *simple_transaction_get(struct file *file, const char __user *buf, |
| 2643 | size_t size); |
| 2644 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
| 2645 | size_t size, loff_t *pos); |
| 2646 | int simple_transaction_release(struct inode *inode, struct file *file); |
| 2647 | |
Ingo Molnar | 76791ab | 2009-03-25 16:48:35 +0100 | [diff] [blame] | 2648 | void simple_transaction_set(struct file *file, size_t n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2649 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2650 | /* |
| 2651 | * simple attribute files |
| 2652 | * |
| 2653 | * These attributes behave similar to those in sysfs: |
| 2654 | * |
| 2655 | * Writing to an attribute immediately sets a value, an open file can be |
| 2656 | * written to multiple times. |
| 2657 | * |
| 2658 | * Reading from an attribute creates a buffer from the value that might get |
| 2659 | * read with multiple read calls. When the attribute has been read |
| 2660 | * completely, no further read calls are possible until the file is opened |
| 2661 | * again. |
| 2662 | * |
| 2663 | * All attributes contain a text representation of a numeric value |
| 2664 | * that are accessed with the get() and set() functions. |
| 2665 | */ |
| 2666 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| 2667 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
| 2668 | { \ |
| 2669 | __simple_attr_check_format(__fmt, 0ull); \ |
| 2670 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| 2671 | } \ |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2672 | static const struct file_operations __fops = { \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2673 | .owner = THIS_MODULE, \ |
| 2674 | .open = __fops ## _open, \ |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2675 | .release = simple_attr_release, \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2676 | .read = simple_attr_read, \ |
| 2677 | .write = simple_attr_write, \ |
Arnd Bergmann | 1ec5584 | 2010-08-15 21:50:52 +0200 | [diff] [blame] | 2678 | .llseek = generic_file_llseek, \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2679 | }; |
| 2680 | |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2681 | static inline __printf(1, 2) |
| 2682 | void __simple_attr_check_format(const char *fmt, ...) |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2683 | { |
| 2684 | /* don't do anything, just let the compiler check the arguments; */ |
| 2685 | } |
| 2686 | |
| 2687 | int simple_attr_open(struct inode *inode, struct file *file, |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 2688 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2689 | const char *fmt); |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2690 | int simple_attr_release(struct inode *inode, struct file *file); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2691 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
| 2692 | size_t len, loff_t *ppos); |
| 2693 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| 2694 | size_t len, loff_t *ppos); |
| 2695 | |
Alexey Dobriyan | 4be2854 | 2007-10-16 23:26:21 -0700 | [diff] [blame] | 2696 | struct ctl_table; |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2697 | int proc_nr_files(struct ctl_table *table, int write, |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2698 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Christoph Hellwig | 312d3ca | 2010-10-10 05:36:23 -0400 | [diff] [blame] | 2699 | int proc_nr_dentry(struct ctl_table *table, int write, |
| 2700 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 2701 | int proc_nr_inodes(struct ctl_table *table, int write, |
| 2702 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Tetsuo Handa | 38e23c9 | 2009-04-09 20:17:52 +0900 | [diff] [blame] | 2703 | int __init get_filesystem_list(char *buf); |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2704 | |
Namhyung Kim | 3cd90ea | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2705 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
Namhyung Kim | 1a44bc8 | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2706 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
| 2707 | |
Al Viro | 6d12552 | 2009-12-24 06:58:56 -0500 | [diff] [blame] | 2708 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
Eric Paris | ecf081d | 2009-12-17 21:24:25 -0500 | [diff] [blame] | 2709 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
Namhyung Kim | 1a44bc8 | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2710 | (flag & __FMODE_NONOTIFY))) |
Al Viro | 5300990 | 2009-12-19 10:15:07 -0500 | [diff] [blame] | 2711 | |
Al Viro | 8d334ac | 2011-07-24 23:21:59 -0400 | [diff] [blame] | 2712 | static inline int is_sxid(umode_t mode) |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 2713 | { |
| 2714 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); |
| 2715 | } |
| 2716 | |
| 2717 | static inline void inode_has_no_xattr(struct inode *inode) |
| 2718 | { |
Al Viro | 9e1f1de | 2011-06-03 18:24:58 -0400 | [diff] [blame] | 2719 | 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] | 2720 | inode->i_flags |= S_NOSEC; |
| 2721 | } |
| 2722 | |
Al Viro | 5f99f4e | 2013-05-15 20:23:06 -0400 | [diff] [blame] | 2723 | static inline bool dir_emit(struct dir_context *ctx, |
| 2724 | const char *name, int namelen, |
| 2725 | u64 ino, unsigned type) |
| 2726 | { |
| 2727 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; |
| 2728 | } |
| 2729 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) |
| 2730 | { |
| 2731 | return ctx->actor(ctx, ".", 1, ctx->pos, |
| 2732 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; |
| 2733 | } |
| 2734 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) |
| 2735 | { |
| 2736 | return ctx->actor(ctx, "..", 2, ctx->pos, |
| 2737 | parent_ino(file->f_path.dentry), DT_DIR) == 0; |
| 2738 | } |
| 2739 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) |
| 2740 | { |
| 2741 | if (ctx->pos == 0) { |
| 2742 | if (!dir_emit_dot(file, ctx)) |
| 2743 | return false; |
| 2744 | ctx->pos = 1; |
| 2745 | } |
| 2746 | if (ctx->pos == 1) { |
| 2747 | if (!dir_emit_dotdot(file, ctx)) |
| 2748 | return false; |
| 2749 | ctx->pos = 2; |
| 2750 | } |
| 2751 | return true; |
| 2752 | } |
Al Viro | 5ded75e | 2013-05-15 21:02:48 -0400 | [diff] [blame] | 2753 | static inline bool dir_relax(struct inode *inode) |
| 2754 | { |
| 2755 | mutex_unlock(&inode->i_mutex); |
| 2756 | mutex_lock(&inode->i_mutex); |
| 2757 | return !IS_DEADDIR(inode); |
| 2758 | } |
Al Viro | 5f99f4e | 2013-05-15 20:23:06 -0400 | [diff] [blame] | 2759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2760 | #endif /* _LINUX_FS_H */ |