| #ifndef _LINUX_FS_H |
| #define _LINUX_FS_H |
| |
| /* |
| * This file has definitions for some important file table |
| * structures etc. |
| */ |
| |
| #include <linux/limits.h> |
| #include <linux/ioctl.h> |
| #include <linux/blk_types.h> |
| #include <linux/types.h> |
| |
| /* |
| * It's silly to have NR_OPEN bigger than NR_FILE, but you can change |
| * the file limit at runtime and only root can increase the per-process |
| * nr_file rlimit, so it's safe to set up a ridiculously high absolute |
| * upper limit on files-per-process. |
| * |
| * Some programs (notably those using select()) may have to be |
| * recompiled to take full advantage of the new limits.. |
| */ |
| |
| /* Fixed constants first: */ |
| #undef NR_OPEN |
| #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ |
| |
| #define BLOCK_SIZE_BITS 10 |
| #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) |
| |
| #define SEEK_SET 0 /* seek relative to beginning of file */ |
| #define SEEK_CUR 1 /* seek relative to current file position */ |
| #define SEEK_END 2 /* seek relative to end of file */ |
| #define SEEK_MAX SEEK_END |
| |
| struct fstrim_range { |
| __u64 start; |
| __u64 len; |
| __u64 minlen; |
| }; |
| |
| /* And dynamically-tunable limits and defaults: */ |
| struct files_stat_struct { |
| unsigned long nr_files; /* read only */ |
| unsigned long nr_free_files; /* read only */ |
| unsigned long max_files; /* tunable */ |
| }; |
| |
| struct inodes_stat_t { |
| int nr_inodes; |
| int nr_unused; |
| int dummy[5]; /* padding for sysctl ABI compatibility */ |
| }; |
| |
| |
| #define NR_FILE 8192 /* this can well be larger on a larger system */ |
| |
| #define MAY_EXEC 1 |
| #define MAY_WRITE 2 |
| #define MAY_READ 4 |
| #define MAY_APPEND 8 |
| #define MAY_ACCESS 16 |
| #define MAY_OPEN 32 |
| #define MAY_CHDIR 64 |
| |
| /* |
| * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
| * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
| */ |
| |
| /* file is open for reading */ |
| #define FMODE_READ ((__force fmode_t)0x1) |
| /* file is open for writing */ |
| #define FMODE_WRITE ((__force fmode_t)0x2) |
| /* file is seekable */ |
| #define FMODE_LSEEK ((__force fmode_t)0x4) |
| /* file can be accessed using pread */ |
| #define FMODE_PREAD ((__force fmode_t)0x8) |
| /* file can be accessed using pwrite */ |
| #define FMODE_PWRITE ((__force fmode_t)0x10) |
| /* File is opened for execution with sys_execve / sys_uselib */ |
| #define FMODE_EXEC ((__force fmode_t)0x20) |
| /* File is opened with O_NDELAY (only set for block devices) */ |
| #define FMODE_NDELAY ((__force fmode_t)0x40) |
| /* File is opened with O_EXCL (only set for block devices) */ |
| #define FMODE_EXCL ((__force fmode_t)0x80) |
| /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
| (specialy hack for floppy.c) */ |
| #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
| |
| /* |
| * Don't update ctime and mtime. |
| * |
| * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
| * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
| */ |
| #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
| |
| /* Expect random access pattern */ |
| #define FMODE_RANDOM ((__force fmode_t)0x1000) |
| |
| /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
| #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) |
| |
| /* File is opened with O_PATH; almost nothing can be done with it */ |
| #define FMODE_PATH ((__force fmode_t)0x4000) |
| |
| /* File was opened by fanotify and shouldn't generate fanotify events */ |
| #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) |
| |
| /* |
| * The below are the various read and write types that we support. Some of |
| * them include behavioral modifiers that send information down to the |
| * block layer and IO scheduler. Terminology: |
| * |
| * The block layer uses device plugging to defer IO a little bit, in |
| * the hope that we will see more IO very shortly. This increases |
| * coalescing of adjacent IO and thus reduces the number of IOs we |
| * have to send to the device. It also allows for better queuing, |
| * if the IO isn't mergeable. If the caller is going to be waiting |
| * for the IO, then he must ensure that the device is unplugged so |
| * that the IO is dispatched to the driver. |
| * |
| * All IO is handled async in Linux. This is fine for background |
| * writes, but for reads or writes that someone waits for completion |
| * on, we want to notify the block layer and IO scheduler so that they |
| * know about it. That allows them to make better scheduling |
| * decisions. So when the below references 'sync' and 'async', it |
| * is referencing this priority hint. |
| * |
| * With that in mind, the available types are: |
| * |
| * READ A normal read operation. Device will be plugged. |
| * READ_SYNC A synchronous read. Device is not plugged, caller can |
| * immediately wait on this read without caring about |
| * unplugging. |
| * READA Used for read-ahead operations. Lower priority, and the |
| * block layer could (in theory) choose to ignore this |
| * request if it runs into resource problems. |
| * WRITE A normal async write. Device will be plugged. |
| * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
| * the hint that someone will be waiting on this IO |
| * shortly. The write equivalent of READ_SYNC. |
| * WRITE_ODIRECT Special case write for O_DIRECT only. |
| * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
| * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on |
| * non-volatile media on completion. |
| * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded |
| * by a cache flush and data is guaranteed to be on |
| * non-volatile media on completion. |
| * |
| */ |
| #define RW_MASK REQ_WRITE |
| #define RWA_MASK REQ_RAHEAD |
| |
| #define READ 0 |
| #define WRITE RW_MASK |
| #define READA RWA_MASK |
| |
| #define READ_SYNC (READ | REQ_SYNC) |
| #define READ_META (READ | REQ_META) |
| #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
| #define WRITE_ODIRECT (WRITE | REQ_SYNC) |
| #define WRITE_META (WRITE | REQ_META) |
| #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
| #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) |
| #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) |
| |
| #define SEL_IN 1 |
| #define SEL_OUT 2 |
| #define SEL_EX 4 |
| |
| /* public flags for file_system_type */ |
| #define FS_REQUIRES_DEV 1 |
| #define FS_BINARY_MOUNTDATA 2 |
| #define FS_HAS_SUBTYPE 4 |
| #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
| #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
| * during rename() internally. |
| */ |
| |
| /* |
| * These are the fs-independent mount-flags: up to 32 flags are supported |
| */ |
| #define MS_RDONLY 1 /* Mount read-only */ |
| #define MS_NOSUID 2 /* Ignore suid and sgid bits */ |
| #define MS_NODEV 4 /* Disallow access to device special files */ |
| #define MS_NOEXEC 8 /* Disallow program execution */ |
| #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ |
| #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ |
| #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ |
| #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ |
| #define MS_NOATIME 1024 /* Do not update access times. */ |
| #define MS_NODIRATIME 2048 /* Do not update directory access times */ |
| #define MS_BIND 4096 |
| #define MS_MOVE 8192 |
| #define MS_REC 16384 |
| #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
| MS_VERBOSE is deprecated. */ |
| #define MS_SILENT 32768 |
| #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
| #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
| #define MS_PRIVATE (1<<18) /* change to private */ |
| #define MS_SLAVE (1<<19) /* change to slave */ |
| #define MS_SHARED (1<<20) /* change to shared */ |
| #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ |
| #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ |
| #define MS_I_VERSION (1<<23) /* Update inode I_version field */ |
| #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ |
| #define MS_BORN (1<<29) |
| #define MS_ACTIVE (1<<30) |
| #define MS_NOUSER (1<<31) |
| |
| /* |
| * Superblock flags that can be altered by MS_REMOUNT |
| */ |
| #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) |
| |
| /* |
| * Old magic mount flag and mask |
| */ |
| #define MS_MGC_VAL 0xC0ED0000 |
| #define MS_MGC_MSK 0xffff0000 |
| |
| /* Inode flags - they have nothing to superblock flags now */ |
| |
| #define S_SYNC 1 /* Writes are synced at once */ |
| #define S_NOATIME 2 /* Do not update access times */ |
| #define S_APPEND 4 /* Append-only file */ |
| #define S_IMMUTABLE 8 /* Immutable file */ |
| #define S_DEAD 16 /* removed, but still open directory */ |
| #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
| #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
| #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
| #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
| #define S_PRIVATE 512 /* Inode is fs-internal */ |
| #define S_IMA 1024 /* Inode has an associated IMA struct */ |
| #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
| |
| /* |
| * Note that nosuid etc flags are inode-specific: setting some file-system |
| * flags just means all the inodes inherit those flags by default. It might be |
| * possible to override it selectively if you really wanted to with some |
| * ioctl() that is not currently implemented. |
| * |
| * Exception: MS_RDONLY is always applied to the entire file system. |
| * |
| * Unfortunately, it is possible to change a filesystems flags with it mounted |
| * with files in use. This means that all of the inodes will not have their |
| * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| */ |
| #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) |
| |
| #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| ((inode)->i_flags & S_SYNC)) |
| #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
| #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
| #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
| |
| #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
| #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| |
| #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
| #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
| #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
| |
| /* the read-only stuff doesn't really belong here, but any other place is |
| probably as bad and I don't want to create yet another include file. */ |
| |
| #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ |
| #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ |
| #define BLKRRPART _IO(0x12,95) /* re-read partition table */ |
| #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ |
| #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ |
| #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ |
| #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ |
| #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ |
| #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ |
| #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ |
| #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ |
| #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ |
| #if 0 |
| #define BLKPG _IO(0x12,105)/* See blkpg.h */ |
| |
| /* Some people are morons. Do not use sizeof! */ |
| |
| #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ |
| #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ |
| /* This was here just to show that the number is taken - |
| probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ |
| #endif |
| /* A jump here: 108-111 have been used for various private purposes. */ |
| #define BLKBSZGET _IOR(0x12,112,size_t) |
| #define BLKBSZSET _IOW(0x12,113,size_t) |
| #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ |
| #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
| #define BLKTRACESTART _IO(0x12,116) |
| #define BLKTRACESTOP _IO(0x12,117) |
| #define BLKTRACETEARDOWN _IO(0x12,118) |
| #define BLKDISCARD _IO(0x12,119) |
| #define BLKIOMIN _IO(0x12,120) |
| #define BLKIOOPT _IO(0x12,121) |
| #define BLKALIGNOFF _IO(0x12,122) |
| #define BLKPBSZGET _IO(0x12,123) |
| #define BLKDISCARDZEROES _IO(0x12,124) |
| #define BLKSECDISCARD _IO(0x12,125) |
| |
| #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ |
| #define FIBMAP _IO(0x00,1) /* bmap access */ |
| #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ |
| #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ |
| #define FITHAW _IOWR('X', 120, int) /* Thaw */ |
| #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ |
| |
| #define FS_IOC_GETFLAGS _IOR('f', 1, long) |
| #define FS_IOC_SETFLAGS _IOW('f', 2, long) |
| #define FS_IOC_GETVERSION _IOR('v', 1, long) |
| #define FS_IOC_SETVERSION _IOW('v', 2, long) |
| #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) |
| #define FS_IOC32_GETFLAGS _IOR('f', 1, int) |
| #define FS_IOC32_SETFLAGS _IOW('f', 2, int) |
| #define FS_IOC32_GETVERSION _IOR('v', 1, int) |
| #define FS_IOC32_SETVERSION _IOW('v', 2, int) |
| |
| /* |
| * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) |
| */ |
| #define FS_SECRM_FL 0x00000001 /* Secure deletion */ |
| #define FS_UNRM_FL 0x00000002 /* Undelete */ |
| #define FS_COMPR_FL 0x00000004 /* Compress file */ |
| #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ |
| #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ |
| #define FS_NODUMP_FL 0x00000040 /* do not dump file */ |
| #define FS_NOATIME_FL 0x00000080 /* do not update atime */ |
| /* Reserved for compression usage... */ |
| #define FS_DIRTY_FL 0x00000100 |
| #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
| #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ |
| #define FS_ECOMPR_FL 0x00000800 /* Compression error */ |
| /* End compression flags --- maybe not all used */ |
| #define FS_BTREE_FL 0x00001000 /* btree format dir */ |
| #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ |
| #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ |
| #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ |
| #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
| #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
| #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
| #define FS_EXTENT_FL 0x00080000 /* Extents */ |
| #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ |
| #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ |
| #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
| |
| #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ |
| #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ |
| |
| |
| #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
| #define SYNC_FILE_RANGE_WRITE 2 |
| #define SYNC_FILE_RANGE_WAIT_AFTER 4 |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/linkage.h> |
| #include <linux/wait.h> |
| #include <linux/types.h> |
| #include <linux/kdev_t.h> |
| #include <linux/dcache.h> |
| #include <linux/path.h> |
| #include <linux/stat.h> |
| #include <linux/cache.h> |
| #include <linux/list.h> |
| #include <linux/radix-tree.h> |
| #include <linux/prio_tree.h> |
| #include <linux/init.h> |
| #include <linux/pid.h> |
| #include <linux/mutex.h> |
| #include <linux/capability.h> |
| #include <linux/semaphore.h> |
| #include <linux/fiemap.h> |
| #include <linux/rculist_bl.h> |
| |
| #include <asm/atomic.h> |
| #include <asm/byteorder.h> |
| |
| struct export_operations; |
| struct hd_geometry; |
| struct iovec; |
| struct nameidata; |
| struct kiocb; |
| struct kobject; |
| struct pipe_inode_info; |
| struct poll_table_struct; |
| struct kstatfs; |
| struct vm_area_struct; |
| struct vfsmount; |
| struct cred; |
| |
| extern void __init inode_init(void); |
| extern void __init inode_init_early(void); |
| extern void __init files_init(unsigned long); |
| |
| extern struct files_stat_struct files_stat; |
| extern unsigned long get_max_files(void); |
| extern int sysctl_nr_open; |
| extern struct inodes_stat_t inodes_stat; |
| extern int leases_enable, lease_break_time; |
| |
| struct buffer_head; |
| typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
| struct buffer_head *bh_result, int create); |
| typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
| ssize_t bytes, void *private, int ret, |
| bool is_async); |
| |
| /* |
| * Attribute flags. These should be or-ed together to figure out what |
| * has been changed! |
| */ |
| #define ATTR_MODE (1 << 0) |
| #define ATTR_UID (1 << 1) |
| #define ATTR_GID (1 << 2) |
| #define ATTR_SIZE (1 << 3) |
| #define ATTR_ATIME (1 << 4) |
| #define ATTR_MTIME (1 << 5) |
| #define ATTR_CTIME (1 << 6) |
| #define ATTR_ATIME_SET (1 << 7) |
| #define ATTR_MTIME_SET (1 << 8) |
| #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
| #define ATTR_ATTR_FLAG (1 << 10) |
| #define ATTR_KILL_SUID (1 << 11) |
| #define ATTR_KILL_SGID (1 << 12) |
| #define ATTR_FILE (1 << 13) |
| #define ATTR_KILL_PRIV (1 << 14) |
| #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
| #define ATTR_TIMES_SET (1 << 16) |
| |
| /* |
| * This is the Inode Attributes structure, used for notify_change(). It |
| * uses the above definitions as flags, to know which values have changed. |
| * Also, in this manner, a Filesystem can look at only the values it cares |
| * about. Basically, these are the attributes that the VFS layer can |
| * request to change from the FS layer. |
| * |
| * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
| */ |
| struct iattr { |
| unsigned int ia_valid; |
| umode_t ia_mode; |
| uid_t ia_uid; |
| gid_t ia_gid; |
| loff_t ia_size; |
| struct timespec ia_atime; |
| struct timespec ia_mtime; |
| struct timespec ia_ctime; |
| |
| /* |
| * Not an attribute, but an auxiliary info for filesystems wanting to |
| * implement an ftruncate() like method. NOTE: filesystem should |
| * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
| */ |
| struct file *ia_file; |
| }; |
| |
| /* |
| * Includes for diskquotas. |
| */ |
| #include <linux/quota.h> |
| |
| /** |
| * enum positive_aop_returns - aop return codes with specific semantics |
| * |
| * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
| * completed, that the page is still locked, and |
| * should be considered active. The VM uses this hint |
| * to return the page to the active list -- it won't |
| * be a candidate for writeback again in the near |
| * future. Other callers must be careful to unlock |
| * the page if they get this return. Returned by |
| * writepage(); |
| * |
| * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
| * unlocked it and the page might have been truncated. |
| * The caller should back up to acquiring a new page and |
| * trying again. The aop will be taking reasonable |
| * precautions not to livelock. If the caller held a page |
| * reference, it should drop it before retrying. Returned |
| * by readpage(). |
| * |
| * address_space_operation functions return these large constants to indicate |
| * special semantics to the caller. These are much larger than the bytes in a |
| * page to allow for functions that return the number of bytes operated on in a |
| * given page. |
| */ |
| |
| enum positive_aop_returns { |
| AOP_WRITEPAGE_ACTIVATE = 0x80000, |
| AOP_TRUNCATED_PAGE = 0x80001, |
| }; |
| |
| #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
| #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
| #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
| * helper code (eg buffer layer) |
| * to clear GFP_FS from alloc */ |
| |
| /* |
| * oh the beauties of C type declarations. |
| */ |
| struct page; |
| struct address_space; |
| struct writeback_control; |
| |
| struct iov_iter { |
| const struct iovec *iov; |
| unsigned long nr_segs; |
| size_t iov_offset; |
| size_t count; |
| }; |
| |
| size_t iov_iter_copy_from_user_atomic(struct page *page, |
| struct iov_iter *i, unsigned long offset, size_t bytes); |
| size_t iov_iter_copy_from_user(struct page *page, |
| struct iov_iter *i, unsigned long offset, size_t bytes); |
| void iov_iter_advance(struct iov_iter *i, size_t bytes); |
| int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); |
| size_t iov_iter_single_seg_count(struct iov_iter *i); |
| |
| static inline void iov_iter_init(struct iov_iter *i, |
| const struct iovec *iov, unsigned long nr_segs, |
| size_t count, size_t written) |
| { |
| i->iov = iov; |
| i->nr_segs = nr_segs; |
| i->iov_offset = 0; |
| i->count = count + written; |
| |
| iov_iter_advance(i, written); |
| } |
| |
| static inline size_t iov_iter_count(struct iov_iter *i) |
| { |
| return i->count; |
| } |
| |
| /* |
| * "descriptor" for what we're up to with a read. |
| * This allows us to use the same read code yet |
| * have multiple different users of the data that |
| * we read from a file. |
| * |
| * The simplest case just copies the data to user |
| * mode. |
| */ |
| typedef struct { |
| size_t written; |
| size_t count; |
| union { |
| char __user *buf; |
| void *data; |
| } arg; |
| int error; |
| } read_descriptor_t; |
| |
| typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
| unsigned long, unsigned long); |
| |
| struct address_space_operations { |
| int (*writepage)(struct page *page, struct writeback_control *wbc); |
| int (*readpage)(struct file *, struct page *); |
| |
| /* Write back some dirty pages from this mapping. */ |
| int (*writepages)(struct address_space *, struct writeback_control *); |
| |
| /* Set a page dirty. Return true if this dirtied it */ |
| int (*set_page_dirty)(struct page *page); |
| |
| int (*readpages)(struct file *filp, struct address_space *mapping, |
| struct list_head *pages, unsigned nr_pages); |
| |
| int (*write_begin)(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata); |
| int (*write_end)(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata); |
| |
| /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
| sector_t (*bmap)(struct address_space *, sector_t); |
| void (*invalidatepage) (struct page *, unsigned long); |
| int (*releasepage) (struct page *, gfp_t); |
| void (*freepage)(struct page *); |
| ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
| loff_t offset, unsigned long nr_segs); |
| int (*get_xip_mem)(struct address_space *, pgoff_t, int, |
| void **, unsigned long *); |
| /* migrate the contents of a page to the specified target */ |
| int (*migratepage) (struct address_space *, |
| struct page *, struct page *); |
| int (*launder_page) (struct page *); |
| int (*is_partially_uptodate) (struct page *, read_descriptor_t *, |
| unsigned long); |
| int (*error_remove_page)(struct address_space *, struct page *); |
| }; |
| |
| extern const struct address_space_operations empty_aops; |
| |
| /* |
| * pagecache_write_begin/pagecache_write_end must be used by general code |
| * to write into the pagecache. |
| */ |
| int pagecache_write_begin(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata); |
| |
| int pagecache_write_end(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata); |
| |
| struct backing_dev_info; |
| struct address_space { |
| struct inode *host; /* owner: inode, block_device */ |
| struct radix_tree_root page_tree; /* radix tree of all pages */ |
| spinlock_t tree_lock; /* and lock protecting it */ |
| unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
| struct prio_tree_root i_mmap; /* tree of private and shared mappings */ |
| struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ |
| spinlock_t i_mmap_lock; /* protect tree, count, list */ |
| unsigned int truncate_count; /* Cover race condition with truncate */ |
| unsigned long nrpages; /* number of total pages */ |
| pgoff_t writeback_index;/* writeback starts here */ |
| const struct address_space_operations *a_ops; /* methods */ |
| unsigned long flags; /* error bits/gfp mask */ |
| struct backing_dev_info *backing_dev_info; /* device readahead, etc */ |
| spinlock_t private_lock; /* for use by the address_space */ |
| struct list_head private_list; /* ditto */ |
| struct address_space *assoc_mapping; /* ditto */ |
| struct mutex unmap_mutex; /* to protect unmapping */ |
| } __attribute__((aligned(sizeof(long)))); |
| /* |
| * On most architectures that alignment is already the case; but |
| * must be enforced here for CRIS, to let the least significant bit |
| * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
| */ |
| |
| struct block_device { |
| dev_t bd_dev; /* not a kdev_t - it's a search key */ |
| int bd_openers; |
| struct inode * bd_inode; /* will die */ |
| struct super_block * bd_super; |
| struct mutex bd_mutex; /* open/close mutex */ |
| struct list_head bd_inodes; |
| void * bd_claiming; |
| void * bd_holder; |
| int bd_holders; |
| bool bd_write_holder; |
| #ifdef CONFIG_SYSFS |
| struct list_head bd_holder_disks; |
| #endif |
| struct block_device * bd_contains; |
| unsigned bd_block_size; |
| struct hd_struct * bd_part; |
| /* number of times partitions within this device have been opened. */ |
| unsigned bd_part_count; |
| int bd_invalidated; |
| struct gendisk * bd_disk; |
| struct list_head bd_list; |
| /* |
| * Private data. You must have bd_claim'ed the block_device |
| * to use this. NOTE: bd_claim allows an owner to claim |
| * the same device multiple times, the owner must take special |
| * care to not mess up bd_private for that case. |
| */ |
| unsigned long bd_private; |
| |
| /* The counter of freeze processes */ |
| int bd_fsfreeze_count; |
| /* Mutex for freeze */ |
| struct mutex bd_fsfreeze_mutex; |
| }; |
| |
| /* |
| * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
| * radix trees |
| */ |
| #define PAGECACHE_TAG_DIRTY 0 |
| #define PAGECACHE_TAG_WRITEBACK 1 |
| #define PAGECACHE_TAG_TOWRITE 2 |
| |
| int mapping_tagged(struct address_space *mapping, int tag); |
| |
| /* |
| * Might pages of this file be mapped into userspace? |
| */ |
| static inline int mapping_mapped(struct address_space *mapping) |
| { |
| return !prio_tree_empty(&mapping->i_mmap) || |
| !list_empty(&mapping->i_mmap_nonlinear); |
| } |
| |
| /* |
| * Might pages of this file have been modified in userspace? |
| * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
| * marks vma as VM_SHARED if it is shared, and the file was opened for |
| * writing i.e. vma may be mprotected writable even if now readonly. |
| */ |
| static inline int mapping_writably_mapped(struct address_space *mapping) |
| { |
| return mapping->i_mmap_writable != 0; |
| } |
| |
| /* |
| * Use sequence counter to get consistent i_size on 32-bit processors. |
| */ |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| #include <linux/seqlock.h> |
| #define __NEED_I_SIZE_ORDERED |
| #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
| #else |
| #define i_size_ordered_init(inode) do { } while (0) |
| #endif |
| |
| struct posix_acl; |
| #define ACL_NOT_CACHED ((void *)(-1)) |
| |
| struct inode { |
| /* RCU path lookup touches following: */ |
| umode_t i_mode; |
| uid_t i_uid; |
| gid_t i_gid; |
| const struct inode_operations *i_op; |
| struct super_block *i_sb; |
| |
| spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
| unsigned int i_flags; |
| struct mutex i_mutex; |
| |
| unsigned long i_state; |
| unsigned long dirtied_when; /* jiffies of first dirtying */ |
| |
| struct hlist_node i_hash; |
| struct list_head i_wb_list; /* backing dev IO list */ |
| struct list_head i_lru; /* inode LRU list */ |
| struct list_head i_sb_list; |
| union { |
| struct list_head i_dentry; |
| struct rcu_head i_rcu; |
| }; |
| unsigned long i_ino; |
| atomic_t i_count; |
| unsigned int i_nlink; |
| dev_t i_rdev; |
| unsigned int i_blkbits; |
| u64 i_version; |
| loff_t i_size; |
| #ifdef __NEED_I_SIZE_ORDERED |
| seqcount_t i_size_seqcount; |
| #endif |
| struct timespec i_atime; |
| struct timespec i_mtime; |
| struct timespec i_ctime; |
| blkcnt_t i_blocks; |
| unsigned short i_bytes; |
| struct rw_semaphore i_alloc_sem; |
| const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
| struct file_lock *i_flock; |
| struct address_space *i_mapping; |
| struct address_space i_data; |
| #ifdef CONFIG_QUOTA |
| struct dquot *i_dquot[MAXQUOTAS]; |
| #endif |
| struct list_head i_devices; |
| union { |
| struct pipe_inode_info *i_pipe; |
| struct block_device *i_bdev; |
| struct cdev *i_cdev; |
| }; |
| |
| __u32 i_generation; |
| |
| #ifdef CONFIG_FSNOTIFY |
| __u32 i_fsnotify_mask; /* all events this inode cares about */ |
| struct hlist_head i_fsnotify_marks; |
| #endif |
| |
| #ifdef CONFIG_IMA |
| atomic_t i_readcount; /* struct files open RO */ |
| #endif |
| atomic_t i_writecount; |
| #ifdef CONFIG_SECURITY |
| void *i_security; |
| #endif |
| #ifdef CONFIG_FS_POSIX_ACL |
| struct posix_acl *i_acl; |
| struct posix_acl *i_default_acl; |
| #endif |
| void *i_private; /* fs or device private pointer */ |
| }; |
| |
| static inline int inode_unhashed(struct inode *inode) |
| { |
| return hlist_unhashed(&inode->i_hash); |
| } |
| |
| /* |
| * inode->i_mutex nesting subclasses for the lock validator: |
| * |
| * 0: the object of the current VFS operation |
| * 1: parent |
| * 2: child/target |
| * 3: quota file |
| * |
| * The locking order between these classes is |
| * parent -> child -> normal -> xattr -> quota |
| */ |
| enum inode_i_mutex_lock_class |
| { |
| I_MUTEX_NORMAL, |
| I_MUTEX_PARENT, |
| I_MUTEX_CHILD, |
| I_MUTEX_XATTR, |
| I_MUTEX_QUOTA |
| }; |
| |
| /* |
| * NOTE: in a 32bit arch with a preemptable kernel and |
| * an UP compile the i_size_read/write must be atomic |
| * with respect to the local cpu (unlike with preempt disabled), |
| * but they don't need to be atomic with respect to other cpus like in |
| * true SMP (so they need either to either locally disable irq around |
| * the read or for example on x86 they can be still implemented as a |
| * cmpxchg8b without the need of the lock prefix). For SMP compiles |
| * and 64bit archs it makes no difference if preempt is enabled or not. |
| */ |
| static inline loff_t i_size_read(const struct inode *inode) |
| { |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| loff_t i_size; |
| unsigned int seq; |
| |
| do { |
| seq = read_seqcount_begin(&inode->i_size_seqcount); |
| i_size = inode->i_size; |
| } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
| return i_size; |
| #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| loff_t i_size; |
| |
| preempt_disable(); |
| i_size = inode->i_size; |
| preempt_enable(); |
| return i_size; |
| #else |
| return inode->i_size; |
| #endif |
| } |
| |
| /* |
| * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
| * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
| * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
| */ |
| static inline void i_size_write(struct inode *inode, loff_t i_size) |
| { |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| write_seqcount_begin(&inode->i_size_seqcount); |
| inode->i_size = i_size; |
| write_seqcount_end(&inode->i_size_seqcount); |
| #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| preempt_disable(); |
| inode->i_size = i_size; |
| preempt_enable(); |
| #else |
| inode->i_size = i_size; |
| #endif |
| } |
| |
| static inline unsigned iminor(const struct inode *inode) |
| { |
| return MINOR(inode->i_rdev); |
| } |
| |
| static inline unsigned imajor(const struct inode *inode) |
| { |
| return MAJOR(inode->i_rdev); |
| } |
| |
| extern struct block_device *I_BDEV(struct inode *inode); |
| |
| struct fown_struct { |
| rwlock_t lock; /* protects pid, uid, euid fields */ |
| struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
| enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ |
| uid_t uid, euid; /* uid/euid of process setting the owner */ |
| int signum; /* posix.1b rt signal to be delivered on IO */ |
| }; |
| |
| /* |
| * Track a single file's readahead state |
| */ |
| struct file_ra_state { |
| pgoff_t start; /* where readahead started */ |
| unsigned int size; /* # of readahead pages */ |
| unsigned int async_size; /* do asynchronous readahead when |
| there are only # of pages ahead */ |
| |
| unsigned int ra_pages; /* Maximum readahead window */ |
| unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
| loff_t prev_pos; /* Cache last read() position */ |
| }; |
| |
| /* |
| * Check if @index falls in the readahead windows. |
| */ |
| static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
| { |
| return (index >= ra->start && |
| index < ra->start + ra->size); |
| } |
| |
| #define FILE_MNT_WRITE_TAKEN 1 |
| #define FILE_MNT_WRITE_RELEASED 2 |
| |
| struct file { |
| /* |
| * fu_list becomes invalid after file_free is called and queued via |
| * fu_rcuhead for RCU freeing |
| */ |
| union { |
| struct list_head fu_list; |
| struct rcu_head fu_rcuhead; |
| } f_u; |
| struct path f_path; |
| #define f_dentry f_path.dentry |
| #define f_vfsmnt f_path.mnt |
| const struct file_operations *f_op; |
| spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */ |
| #ifdef CONFIG_SMP |
| int f_sb_list_cpu; |
| #endif |
| atomic_long_t f_count; |
| unsigned int f_flags; |
| fmode_t f_mode; |
| loff_t f_pos; |
| struct fown_struct f_owner; |
| const struct cred *f_cred; |
| struct file_ra_state f_ra; |
| |
| u64 f_version; |
| #ifdef CONFIG_SECURITY |
| void *f_security; |
| #endif |
| /* needed for tty driver, and maybe others */ |
| void *private_data; |
| |
| #ifdef CONFIG_EPOLL |
| /* Used by fs/eventpoll.c to link all the hooks to this file */ |
| struct list_head f_ep_links; |
| #endif /* #ifdef CONFIG_EPOLL */ |
| struct address_space *f_mapping; |
| #ifdef CONFIG_DEBUG_WRITECOUNT |
| unsigned long f_mnt_write_state; |
| #endif |
| }; |
| |
| struct file_handle { |
| __u32 handle_bytes; |
| int handle_type; |
| /* file identifier */ |
| unsigned char f_handle[0]; |
| }; |
| |
| #define get_file(x) atomic_long_inc(&(x)->f_count) |
| #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
| #define file_count(x) atomic_long_read(&(x)->f_count) |
| |
| #ifdef CONFIG_DEBUG_WRITECOUNT |
| static inline void file_take_write(struct file *f) |
| { |
| WARN_ON(f->f_mnt_write_state != 0); |
| f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; |
| } |
| static inline void file_release_write(struct file *f) |
| { |
| f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; |
| } |
| static inline void file_reset_write(struct file *f) |
| { |
| f->f_mnt_write_state = 0; |
| } |
| static inline void file_check_state(struct file *f) |
| { |
| /* |
| * At this point, either both or neither of these bits |
| * should be set. |
| */ |
| WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); |
| WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); |
| } |
| static inline int file_check_writeable(struct file *f) |
| { |
| if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) |
| return 0; |
| printk(KERN_WARNING "writeable file with no " |
| "mnt_want_write()\n"); |
| WARN_ON(1); |
| return -EINVAL; |
| } |
| #else /* !CONFIG_DEBUG_WRITECOUNT */ |
| static inline void file_take_write(struct file *filp) {} |
| static inline void file_release_write(struct file *filp) {} |
| static inline void file_reset_write(struct file *filp) {} |
| static inline void file_check_state(struct file *filp) {} |
| static inline int file_check_writeable(struct file *filp) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_DEBUG_WRITECOUNT */ |
| |
| #define MAX_NON_LFS ((1UL<<31) - 1) |
| |
| /* Page cache limit. The filesystems should put that into their s_maxbytes |
| limits, otherwise bad things can happen in VM. */ |
| #if BITS_PER_LONG==32 |
| #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
| #elif BITS_PER_LONG==64 |
| #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL |
| #endif |
| |
| #define FL_POSIX 1 |
| #define FL_FLOCK 2 |
| #define FL_ACCESS 8 /* not trying to lock, just looking */ |
| #define FL_EXISTS 16 /* when unlocking, test for existence */ |
| #define FL_LEASE 32 /* lease held on this file */ |
| #define FL_CLOSE 64 /* unlock on close */ |
| #define FL_SLEEP 128 /* A blocking lock */ |
| |
| /* |
| * Special return value from posix_lock_file() and vfs_lock_file() for |
| * asynchronous locking. |
| */ |
| #define FILE_LOCK_DEFERRED 1 |
| |
| /* |
| * The POSIX file lock owner is determined by |
| * the "struct files_struct" in the thread group |
| * (or NULL for no owner - BSD locks). |
| * |
| * Lockd stuffs a "host" pointer into this. |
| */ |
| typedef struct files_struct *fl_owner_t; |
| |
| struct file_lock_operations { |
| void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| void (*fl_release_private)(struct file_lock *); |
| }; |
| |
| struct lock_manager_operations { |
| int (*fl_compare_owner)(struct file_lock *, struct file_lock *); |
| void (*fl_notify)(struct file_lock *); /* unblock callback */ |
| int (*fl_grant)(struct file_lock *, struct file_lock *, int); |
| void (*fl_release_private)(struct file_lock *); |
| void (*fl_break)(struct file_lock *); |
| int (*fl_change)(struct file_lock **, int); |
| }; |
| |
| struct lock_manager { |
| struct list_head list; |
| }; |
| |
| void locks_start_grace(struct lock_manager *); |
| void locks_end_grace(struct lock_manager *); |
| int locks_in_grace(void); |
| |
| /* that will die - we need it for nfs_lock_info */ |
| #include <linux/nfs_fs_i.h> |
| |
| struct file_lock { |
| struct file_lock *fl_next; /* singly linked list for this inode */ |
| struct list_head fl_link; /* doubly linked list of all locks */ |
| struct list_head fl_block; /* circular list of blocked processes */ |
| fl_owner_t fl_owner; |
| unsigned char fl_flags; |
| unsigned char fl_type; |
| unsigned int fl_pid; |
| struct pid *fl_nspid; |
| wait_queue_head_t fl_wait; |
| struct file *fl_file; |
| loff_t fl_start; |
| loff_t fl_end; |
| |
| struct fasync_struct * fl_fasync; /* for lease break notifications */ |
| unsigned long fl_break_time; /* for nonblocking lease breaks */ |
| |
| const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
| const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
| union { |
| struct nfs_lock_info nfs_fl; |
| struct nfs4_lock_info nfs4_fl; |
| struct { |
| struct list_head link; /* link in AFS vnode's pending_locks list */ |
| int state; /* state of grant or error if -ve */ |
| } afs; |
| } fl_u; |
| }; |
| |
| /* The following constant reflects the upper bound of the file/locking space */ |
| #ifndef OFFSET_MAX |
| #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
| #define OFFSET_MAX INT_LIMIT(loff_t) |
| #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
| #endif |
| |
| #include <linux/fcntl.h> |
| |
| extern void send_sigio(struct fown_struct *fown, int fd, int band); |
| |
| #ifdef CONFIG_FILE_LOCKING |
| extern int fcntl_getlk(struct file *, struct flock __user *); |
| extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
| struct flock __user *); |
| |
| #if BITS_PER_LONG == 32 |
| extern int fcntl_getlk64(struct file *, struct flock64 __user *); |
| extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
| struct flock64 __user *); |
| #endif |
| |
| extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
| extern int fcntl_getlease(struct file *filp); |
| |
| /* fs/locks.c */ |
| void locks_free_lock(struct file_lock *fl); |
| extern void locks_init_lock(struct file_lock *); |
| extern struct file_lock * locks_alloc_lock(void); |
| extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
| extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
| extern void locks_remove_posix(struct file *, fl_owner_t); |
| extern void locks_remove_flock(struct file *); |
| extern void locks_release_private(struct file_lock *); |
| extern void posix_test_lock(struct file *, struct file_lock *); |
| extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
| extern int posix_lock_file_wait(struct file *, struct file_lock *); |
| extern int posix_unblock_lock(struct file *, struct file_lock *); |
| extern int vfs_test_lock(struct file *, struct file_lock *); |
| extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
| extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
| extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
| extern int __break_lease(struct inode *inode, unsigned int flags); |
| extern void lease_get_mtime(struct inode *, struct timespec *time); |
| extern int generic_setlease(struct file *, long, struct file_lock **); |
| extern int vfs_setlease(struct file *, long, struct file_lock **); |
| extern int lease_modify(struct file_lock **, int); |
| extern int lock_may_read(struct inode *, loff_t start, unsigned long count); |
| extern int lock_may_write(struct inode *, loff_t start, unsigned long count); |
| extern void lock_flocks(void); |
| extern void unlock_flocks(void); |
| #else /* !CONFIG_FILE_LOCKING */ |
| static inline int fcntl_getlk(struct file *file, struct flock __user *user) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int fcntl_setlk(unsigned int fd, struct file *file, |
| unsigned int cmd, struct flock __user *user) |
| { |
| return -EACCES; |
| } |
| |
| #if BITS_PER_LONG == 32 |
| static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
| unsigned int cmd, struct flock64 __user *user) |
| { |
| return -EACCES; |
| } |
| #endif |
| static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
| { |
| return 0; |
| } |
| |
| static inline int fcntl_getlease(struct file *filp) |
| { |
| return 0; |
| } |
| |
| static inline void locks_init_lock(struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
| { |
| return; |
| } |
| |
| static inline void locks_remove_flock(struct file *filp) |
| { |
| return; |
| } |
| |
| static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
| struct file_lock *conflock) |
| { |
| return -ENOLCK; |
| } |
| |
| static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) |
| { |
| return -ENOLCK; |
| } |
| |
| static inline int posix_unblock_lock(struct file *filp, |
| struct file_lock *waiter) |
| { |
| return -ENOENT; |
| } |
| |
| static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
| { |
| return 0; |
| } |
| |
| static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
| struct file_lock *fl, struct file_lock *conf) |
| { |
| return -ENOLCK; |
| } |
| |
| static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
| { |
| return 0; |
| } |
| |
| static inline int flock_lock_file_wait(struct file *filp, |
| struct file_lock *request) |
| { |
| return -ENOLCK; |
| } |
| |
| static inline int __break_lease(struct inode *inode, unsigned int mode) |
| { |
| return 0; |
| } |
| |
| static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
| { |
| return; |
| } |
| |
| static inline int generic_setlease(struct file *filp, long arg, |
| struct file_lock **flp) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int vfs_setlease(struct file *filp, long arg, |
| struct file_lock **lease) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int lease_modify(struct file_lock **before, int arg) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int lock_may_read(struct inode *inode, loff_t start, |
| unsigned long len) |
| { |
| return 1; |
| } |
| |
| static inline int lock_may_write(struct inode *inode, loff_t start, |
| unsigned long len) |
| { |
| return 1; |
| } |
| |
| static inline void lock_flocks(void) |
| { |
| } |
| |
| static inline void unlock_flocks(void) |
| { |
| } |
| |
| #endif /* !CONFIG_FILE_LOCKING */ |
| |
| |
| struct fasync_struct { |
| spinlock_t fa_lock; |
| int magic; |
| int fa_fd; |
| struct fasync_struct *fa_next; /* singly linked list */ |
| struct file *fa_file; |
| struct rcu_head fa_rcu; |
| }; |
| |
| #define FASYNC_MAGIC 0x4601 |
| |
| /* SMP safe fasync helpers: */ |
| extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
| extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
| extern int fasync_remove_entry(struct file *, struct fasync_struct **); |
| extern struct fasync_struct *fasync_alloc(void); |
| extern void fasync_free(struct fasync_struct *); |
| |
| /* can be called from interrupts */ |
| extern void kill_fasync(struct fasync_struct **, int, int); |
| |
| extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
| extern int f_setown(struct file *filp, unsigned long arg, int force); |
| extern void f_delown(struct file *filp); |
| extern pid_t f_getown(struct file *filp); |
| extern int send_sigurg(struct fown_struct *fown); |
| |
| /* |
| * Umount options |
| */ |
| |
| #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
| #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
| #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
| #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
| #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ |
| |
| extern struct list_head super_blocks; |
| extern spinlock_t sb_lock; |
| |
| struct super_block { |
| struct list_head s_list; /* Keep this first */ |
| dev_t s_dev; /* search index; _not_ kdev_t */ |
| unsigned char s_dirt; |
| unsigned char s_blocksize_bits; |
| unsigned long s_blocksize; |
| loff_t s_maxbytes; /* Max file size */ |
| struct file_system_type *s_type; |
| const struct super_operations *s_op; |
| const struct dquot_operations *dq_op; |
| const struct quotactl_ops *s_qcop; |
| const struct export_operations *s_export_op; |
| unsigned long s_flags; |
| unsigned long s_magic; |
| struct dentry *s_root; |
| struct rw_semaphore s_umount; |
| struct mutex s_lock; |
| int s_count; |
| atomic_t s_active; |
| #ifdef CONFIG_SECURITY |
| void *s_security; |
| #endif |
| const struct xattr_handler **s_xattr; |
| |
| struct list_head s_inodes; /* all inodes */ |
| struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
| #ifdef CONFIG_SMP |
| struct list_head __percpu *s_files; |
| #else |
| struct list_head s_files; |
| #endif |
| /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */ |
| struct list_head s_dentry_lru; /* unused dentry lru */ |
| int s_nr_dentry_unused; /* # of dentry on lru */ |
| |
| struct block_device *s_bdev; |
| struct backing_dev_info *s_bdi; |
| struct mtd_info *s_mtd; |
| struct list_head s_instances; |
| struct quota_info s_dquot; /* Diskquota specific options */ |
| |
| int s_frozen; |
| wait_queue_head_t s_wait_unfrozen; |
| |
| char s_id[32]; /* Informational name */ |
| u8 s_uuid[16]; /* UUID */ |
| |
| void *s_fs_info; /* Filesystem private info */ |
| fmode_t s_mode; |
| |
| /* Granularity of c/m/atime in ns. |
| Cannot be worse than a second */ |
| u32 s_time_gran; |
| |
| /* |
| * The next field is for VFS *only*. No filesystems have any business |
| * even looking at it. You had been warned. |
| */ |
| struct mutex s_vfs_rename_mutex; /* Kludge */ |
| |
| /* |
| * Filesystem subtype. If non-empty the filesystem type field |
| * in /proc/mounts will be "type.subtype" |
| */ |
| char *s_subtype; |
| |
| /* |
| * Saved mount options for lazy filesystems using |
| * generic_show_options() |
| */ |
| char __rcu *s_options; |
| const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
| }; |
| |
| extern struct timespec current_fs_time(struct super_block *sb); |
| |
| /* |
| * Snapshotting support. |
| */ |
| enum { |
| SB_UNFROZEN = 0, |
| SB_FREEZE_WRITE = 1, |
| SB_FREEZE_TRANS = 2, |
| }; |
| |
| #define vfs_check_frozen(sb, level) \ |
| wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) |
| |
| #define get_fs_excl() atomic_inc(¤t->fs_excl) |
| #define put_fs_excl() atomic_dec(¤t->fs_excl) |
| #define has_fs_excl() atomic_read(¤t->fs_excl) |
| |
| /* |
| * until VFS tracks user namespaces for inodes, just make all files |
| * belong to init_user_ns |
| */ |
| extern struct user_namespace init_user_ns; |
| #define inode_userns(inode) (&init_user_ns) |
| extern bool inode_owner_or_capable(const struct inode *inode); |
| |
| /* not quite ready to be deprecated, but... */ |
| extern void lock_super(struct super_block *); |
| extern void unlock_super(struct super_block *); |
| |
| /* |
| * VFS helper functions.. |
| */ |
| extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
| extern int vfs_mkdir(struct inode *, struct dentry *, int); |
| extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); |
| extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
| extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
| extern int vfs_rmdir(struct inode *, struct dentry *); |
| extern int vfs_unlink(struct inode *, struct dentry *); |
| extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
| |
| /* |
| * VFS dentry helper functions. |
| */ |
| extern void dentry_unhash(struct dentry *dentry); |
| |
| /* |
| * VFS file helper functions. |
| */ |
| extern int file_permission(struct file *, int); |
| extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
| mode_t mode); |
| /* |
| * VFS FS_IOC_FIEMAP helper definitions. |
| */ |
| struct fiemap_extent_info { |
| unsigned int fi_flags; /* Flags as passed from user */ |
| unsigned int fi_extents_mapped; /* Number of mapped extents */ |
| unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
| struct fiemap_extent __user *fi_extents_start; /* Start of |
| fiemap_extent array */ |
| }; |
| int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
| u64 phys, u64 len, u32 flags); |
| int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
| |
| /* |
| * File types |
| * |
| * NOTE! These match bits 12..15 of stat.st_mode |
| * (ie "(i_mode >> 12) & 15"). |
| */ |
| #define DT_UNKNOWN 0 |
| #define DT_FIFO 1 |
| #define DT_CHR 2 |
| #define DT_DIR 4 |
| #define DT_BLK 6 |
| #define DT_REG 8 |
| #define DT_LNK 10 |
| #define DT_SOCK 12 |
| #define DT_WHT 14 |
| |
| /* |
| * This is the "filldir" function type, used by readdir() to let |
| * the kernel specify what kind of dirent layout it wants to have. |
| * This allows the kernel to read directories into kernel space or |
| * to have different dirent layouts depending on the binary type. |
| */ |
| typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
| struct block_device_operations; |
| |
| /* These macros are for out of kernel modules to test that |
| * the kernel supports the unlocked_ioctl and compat_ioctl |
| * fields in struct file_operations. */ |
| #define HAVE_COMPAT_IOCTL 1 |
| #define HAVE_UNLOCKED_IOCTL 1 |
| |
| /* |
| * NOTE: |
| * all file operations except setlease can be called without |
| * the big kernel lock held in all filesystems. |
| */ |
| struct file_operations { |
| struct module *owner; |
| loff_t (*llseek) (struct file *, loff_t, int); |
| ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
| ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
| ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
| ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
| int (*readdir) (struct file *, void *, filldir_t); |
| unsigned int (*poll) (struct file *, struct poll_table_struct *); |
| long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
| long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
| int (*mmap) (struct file *, struct vm_area_struct *); |
| int (*open) (struct inode *, struct file *); |
| int (*flush) (struct file *, fl_owner_t id); |
| int (*release) (struct inode *, struct file *); |
| int (*fsync) (struct file *, int datasync); |
| int (*aio_fsync) (struct kiocb *, int datasync); |
| int (*fasync) (int, struct file *, int); |
| int (*lock) (struct file *, int, struct file_lock *); |
| ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
| unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| int (*check_flags)(int); |
| int (*flock) (struct file *, int, struct file_lock *); |
| ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
| ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
| int (*setlease)(struct file *, long, struct file_lock **); |
| long (*fallocate)(struct file *file, int mode, loff_t offset, |
| loff_t len); |
| }; |
| |
| #define IPERM_FLAG_RCU 0x0001 |
| |
| struct inode_operations { |
| struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); |
| void * (*follow_link) (struct dentry *, struct nameidata *); |
| int (*permission) (struct inode *, int, unsigned int); |
| int (*check_acl)(struct inode *, int, unsigned int); |
| |
| int (*readlink) (struct dentry *, char __user *,int); |
| void (*put_link) (struct dentry *, struct nameidata *, void *); |
| |
| int (*create) (struct inode *,struct dentry *,int, struct nameidata *); |
| int (*link) (struct dentry *,struct inode *,struct dentry *); |
| int (*unlink) (struct inode *,struct dentry *); |
| int (*symlink) (struct inode *,struct dentry *,const char *); |
| int (*mkdir) (struct inode *,struct dentry *,int); |
| int (*rmdir) (struct inode *,struct dentry *); |
| int (*mknod) (struct inode *,struct dentry *,int,dev_t); |
| int (*rename) (struct inode *, struct dentry *, |
| struct inode *, struct dentry *); |
| void (*truncate) (struct inode *); |
| int (*setattr) (struct dentry *, struct iattr *); |
| int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
| int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
| ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
| ssize_t (*listxattr) (struct dentry *, char *, size_t); |
| int (*removexattr) (struct dentry *, const char *); |
| void (*truncate_range)(struct inode *, loff_t, loff_t); |
| int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
| u64 len); |
| } ____cacheline_aligned; |
| |
| struct seq_file; |
| |
| ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
| unsigned long nr_segs, unsigned long fast_segs, |
| struct iovec *fast_pointer, |
| struct iovec **ret_pointer); |
| |
| extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
| extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
| extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
| unsigned long, loff_t *); |
| extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
| unsigned long, loff_t *); |
| |
| struct super_operations { |
| struct inode *(*alloc_inode)(struct super_block *sb); |
| void (*destroy_inode)(struct inode *); |
| |
| void (*dirty_inode) (struct inode *); |
| int (*write_inode) (struct inode *, struct writeback_control *wbc); |
| int (*drop_inode) (struct inode *); |
| void (*evict_inode) (struct inode *); |
| void (*put_super) (struct super_block *); |
| void (*write_super) (struct super_block *); |
| int (*sync_fs)(struct super_block *sb, int wait); |
| int (*freeze_fs) (struct super_block *); |
| int (*unfreeze_fs) (struct super_block *); |
| int (*statfs) (struct dentry *, struct kstatfs *); |
| int (*remount_fs) (struct super_block *, int *, char *); |
| void (*umount_begin) (struct super_block *); |
| |
| int (*show_options)(struct seq_file *, struct vfsmount *); |
| int (*show_devname)(struct seq_file *, struct vfsmount *); |
| int (*show_path)(struct seq_file *, struct vfsmount *); |
| int (*show_stats)(struct seq_file *, struct vfsmount *); |
| #ifdef CONFIG_QUOTA |
| ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
| ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
| #endif |
| int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
| }; |
| |
| /* |
| * Inode state bits. Protected by inode->i_lock |
| * |
| * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
| * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
| * |
| * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
| * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
| * various stages of removing an inode. |
| * |
| * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
| * |
| * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
| * fdatasync(). i_atime is the usual cause. |
| * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
| * these changes separately from I_DIRTY_SYNC so that we |
| * don't have to write inode on fdatasync() when only |
| * mtime has changed in it. |
| * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
| * I_NEW Serves as both a mutex and completion notification. |
| * New inodes set I_NEW. If two processes both create |
| * the same inode, one of them will release its inode and |
| * wait for I_NEW to be released before returning. |
| * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
| * also cause waiting on I_NEW, without I_NEW actually |
| * being set. find_inode() uses this to prevent returning |
| * nearly-dead inodes. |
| * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
| * is zero. I_FREEING must be set when I_WILL_FREE is |
| * cleared. |
| * I_FREEING Set when inode is about to be freed but still has dirty |
| * pages or buffers attached or the inode itself is still |
| * dirty. |
| * I_CLEAR Added by end_writeback(). In this state the inode is clean |
| * and can be destroyed. Inode keeps I_FREEING. |
| * |
| * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
| * prohibited for many purposes. iget() must wait for |
| * the inode to be completely released, then create it |
| * anew. Other functions will just ignore such inodes, |
| * if appropriate. I_NEW is used for waiting. |
| * |
| * I_SYNC Synchonized write of dirty inode data. The bits is |
| * set during data writeback, and cleared with a wakeup |
| * on the bit address once it is done. |
| * |
| * Q: What is the difference between I_WILL_FREE and I_FREEING? |
| */ |
| #define I_DIRTY_SYNC (1 << 0) |
| #define I_DIRTY_DATASYNC (1 << 1) |
| #define I_DIRTY_PAGES (1 << 2) |
| #define __I_NEW 3 |
| #define I_NEW (1 << __I_NEW) |
| #define I_WILL_FREE (1 << 4) |
| #define I_FREEING (1 << 5) |
| #define I_CLEAR (1 << 6) |
| #define __I_SYNC 7 |
| #define I_SYNC (1 << __I_SYNC) |
| #define I_REFERENCED (1 << 8) |
| |
| #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
| |
| extern void __mark_inode_dirty(struct inode *, int); |
| static inline void mark_inode_dirty(struct inode *inode) |
| { |
| __mark_inode_dirty(inode, I_DIRTY); |
| } |
| |
| static inline void mark_inode_dirty_sync(struct inode *inode) |
| { |
| __mark_inode_dirty(inode, I_DIRTY_SYNC); |
| } |
| |
| /** |
| * inc_nlink - directly increment an inode's link count |
| * @inode: inode |
| * |
| * This is a low-level filesystem helper to replace any |
| * direct filesystem manipulation of i_nlink. Currently, |
| * it is only here for parity with dec_nlink(). |
| */ |
| static inline void inc_nlink(struct inode *inode) |
| { |
| inode->i_nlink++; |
| } |
| |
| static inline void inode_inc_link_count(struct inode *inode) |
| { |
| inc_nlink(inode); |
| mark_inode_dirty(inode); |
| } |
| |
| /** |
| * drop_nlink - directly drop an inode's link count |
| * @inode: inode |
| * |
| * This is a low-level filesystem helper to replace any |
| * direct filesystem manipulation of i_nlink. In cases |
| * where we are attempting to track writes to the |
| * filesystem, a decrement to zero means an imminent |
| * write when the file is truncated and actually unlinked |
| * on the filesystem. |
| */ |
| static inline void drop_nlink(struct inode *inode) |
| { |
| inode->i_nlink--; |
| } |
| |
| /** |
| * clear_nlink - directly zero an inode's link count |
| * @inode: inode |
| * |
| * This is a low-level filesystem helper to replace any |
| * direct filesystem manipulation of i_nlink. See |
| * drop_nlink() for why we care about i_nlink hitting zero. |
| */ |
| static inline void clear_nlink(struct inode *inode) |
| { |
| inode->i_nlink = 0; |
| } |
| |
| static inline void inode_dec_link_count(struct inode *inode) |
| { |
| drop_nlink(inode); |
| mark_inode_dirty(inode); |
| } |
| |
| /** |
| * inode_inc_iversion - increments i_version |
| * @inode: inode that need to be updated |
| * |
| * Every time the inode is modified, the i_version field will be incremented. |
| * The filesystem has to be mounted with i_version flag |
| */ |
| |
| static inline void inode_inc_iversion(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| inode->i_version++; |
| spin_unlock(&inode->i_lock); |
| } |
| |
| extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
| static inline void file_accessed(struct file *file) |
| { |
| if (!(file->f_flags & O_NOATIME)) |
| touch_atime(file->f_path.mnt, file->f_path.dentry); |
| } |
| |
| int sync_inode(struct inode *inode, struct writeback_control *wbc); |
| int sync_inode_metadata(struct inode *inode, int wait); |
| |
| struct file_system_type { |
| const char *name; |
| int fs_flags; |
| struct dentry *(*mount) (struct file_system_type *, int, |
| const char *, void *); |
| void (*kill_sb) (struct super_block *); |
| struct module *owner; |
| struct file_system_type * next; |
| struct list_head fs_supers; |
| |
| struct lock_class_key s_lock_key; |
| struct lock_class_key s_umount_key; |
| struct lock_class_key s_vfs_rename_key; |
| |
| struct lock_class_key i_lock_key; |
| struct lock_class_key i_mutex_key; |
| struct lock_class_key i_mutex_dir_key; |
| struct lock_class_key i_alloc_sem_key; |
| }; |
| |
| extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
| void *data, int (*fill_super)(struct super_block *, void *, int)); |
| extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, |
| int (*fill_super)(struct super_block *, void *, int)); |
| extern struct dentry *mount_single(struct file_system_type *fs_type, |
| int flags, void *data, |
| int (*fill_super)(struct super_block *, void *, int)); |
| extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
| int flags, void *data, |
| int (*fill_super)(struct super_block *, void *, int)); |
| void generic_shutdown_super(struct super_block *sb); |
| void kill_block_super(struct super_block *sb); |
| void kill_anon_super(struct super_block *sb); |
| void kill_litter_super(struct super_block *sb); |
| void deactivate_super(struct super_block *sb); |
| void deactivate_locked_super(struct super_block *sb); |
| int set_anon_super(struct super_block *s, void *data); |
| struct super_block *sget(struct file_system_type *type, |
| int (*test)(struct super_block *,void *), |
| int (*set)(struct super_block *,void *), |
| void *data); |
| extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
| const struct super_operations *ops, |
| const struct dentry_operations *dops, |
| unsigned long); |
| |
| static inline void sb_mark_dirty(struct super_block *sb) |
| { |
| sb->s_dirt = 1; |
| } |
| static inline void sb_mark_clean(struct super_block *sb) |
| { |
| sb->s_dirt = 0; |
| } |
| static inline int sb_is_dirty(struct super_block *sb) |
| { |
| return sb->s_dirt; |
| } |
| |
| /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
| #define fops_get(fops) \ |
| (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
| #define fops_put(fops) \ |
| do { if (fops) module_put((fops)->owner); } while(0) |
| |
| extern int register_filesystem(struct file_system_type *); |
| extern int unregister_filesystem(struct file_system_type *); |
| extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
| #define kern_mount(type) kern_mount_data(type, NULL) |
| extern int may_umount_tree(struct vfsmount *); |
| extern int may_umount(struct vfsmount *); |
| extern long do_mount(char *, char *, char *, unsigned long, void *); |
| extern struct vfsmount *collect_mounts(struct path *); |
| extern void drop_collected_mounts(struct vfsmount *); |
| extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
| struct vfsmount *); |
| extern int vfs_statfs(struct path *, struct kstatfs *); |
| extern int user_statfs(const char __user *, struct kstatfs *); |
| extern int fd_statfs(int, struct kstatfs *); |
| extern int statfs_by_dentry(struct dentry *, struct kstatfs *); |
| extern int freeze_super(struct super_block *super); |
| extern int thaw_super(struct super_block *super); |
| |
| extern int current_umask(void); |
| |
| /* /sys/fs */ |
| extern struct kobject *fs_kobj; |
| |
| #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
| extern int rw_verify_area(int, struct file *, loff_t *, size_t); |
| |
| #define FLOCK_VERIFY_READ 1 |
| #define FLOCK_VERIFY_WRITE 2 |
| |
| #ifdef CONFIG_FILE_LOCKING |
| extern int locks_mandatory_locked(struct inode *); |
| extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
| |
| /* |
| * Candidates for mandatory locking have the setgid bit set |
| * but no group execute bit - an otherwise meaningless combination. |
| */ |
| |
| static inline int __mandatory_lock(struct inode *ino) |
| { |
| return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
| } |
| |
| /* |
| * ... and these candidates should be on MS_MANDLOCK mounted fs, |
| * otherwise these will be advisory locks |
| */ |
| |
| static inline int mandatory_lock(struct inode *ino) |
| { |
| return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
| } |
| |
| static inline int locks_verify_locked(struct inode *inode) |
| { |
| if (mandatory_lock(inode)) |
| return locks_mandatory_locked(inode); |
| return 0; |
| } |
| |
| static inline int locks_verify_truncate(struct inode *inode, |
| struct file *filp, |
| loff_t size) |
| { |
| if (inode->i_flock && mandatory_lock(inode)) |
| return locks_mandatory_area( |
| FLOCK_VERIFY_WRITE, inode, filp, |
| size < inode->i_size ? size : inode->i_size, |
| (size < inode->i_size ? inode->i_size - size |
| : size - inode->i_size) |
| ); |
| return 0; |
| } |
| |
| static inline int break_lease(struct inode *inode, unsigned int mode) |
| { |
| if (inode->i_flock) |
| return __break_lease(inode, mode); |
| return 0; |
| } |
| #else /* !CONFIG_FILE_LOCKING */ |
| static inline int locks_mandatory_locked(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int locks_mandatory_area(int rw, struct inode *inode, |
| struct file *filp, loff_t offset, |
| size_t count) |
| { |
| return 0; |
| } |
| |
| static inline int __mandatory_lock(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int mandatory_lock(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int locks_verify_locked(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
| size_t size) |
| { |
| return 0; |
| } |
| |
| static inline int break_lease(struct inode *inode, unsigned int mode) |
| { |
| return 0; |
| } |
| |
| #endif /* CONFIG_FILE_LOCKING */ |
| |
| /* fs/open.c */ |
| |
| extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
| struct file *filp); |
| extern int do_fallocate(struct file *file, int mode, loff_t offset, |
| loff_t len); |
| extern long do_sys_open(int dfd, const char __user *filename, int flags, |
| int mode); |
| extern struct file *filp_open(const char *, int, int); |
| extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
| const char *, int); |
| extern struct file * dentry_open(struct dentry *, struct vfsmount *, int, |
| const struct cred *); |
| extern int filp_close(struct file *, fl_owner_t id); |
| extern char * getname(const char __user *); |
| |
| /* fs/ioctl.c */ |
| |
| extern int ioctl_preallocate(struct file *filp, void __user *argp); |
| |
| /* fs/dcache.c */ |
| extern void __init vfs_caches_init_early(void); |
| extern void __init vfs_caches_init(unsigned long); |
| |
| extern struct kmem_cache *names_cachep; |
| |
| #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp)) |
| #define __getname() __getname_gfp(GFP_KERNEL) |
| #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
| #ifndef CONFIG_AUDITSYSCALL |
| #define putname(name) __putname(name) |
| #else |
| extern void putname(const char *name); |
| #endif |
| |
| #ifdef CONFIG_BLOCK |
| extern int register_blkdev(unsigned int, const char *); |
| extern void unregister_blkdev(unsigned int, const char *); |
| extern struct block_device *bdget(dev_t); |
| extern struct block_device *bdgrab(struct block_device *bdev); |
| extern void bd_set_size(struct block_device *, loff_t size); |
| extern void bd_forget(struct inode *inode); |
| extern void bdput(struct block_device *); |
| extern void invalidate_bdev(struct block_device *); |
| extern int sync_blockdev(struct block_device *bdev); |
| extern struct super_block *freeze_bdev(struct block_device *); |
| extern void emergency_thaw_all(void); |
| extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
| extern int fsync_bdev(struct block_device *); |
| #else |
| static inline void bd_forget(struct inode *inode) {} |
| static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
| static inline void invalidate_bdev(struct block_device *bdev) {} |
| |
| static inline struct super_block *freeze_bdev(struct block_device *sb) |
| { |
| return NULL; |
| } |
| |
| static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
| { |
| return 0; |
| } |
| #endif |
| extern int sync_filesystem(struct super_block *); |
| extern const struct file_operations def_blk_fops; |
| extern const struct file_operations def_chr_fops; |
| extern const struct file_operations bad_sock_fops; |
| extern const struct file_operations def_fifo_fops; |
| #ifdef CONFIG_BLOCK |
| extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
| extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
| extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
| extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
| extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
| void *holder); |
| extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, |
| void *holder); |
| extern int blkdev_put(struct block_device *bdev, fmode_t mode); |
| #ifdef CONFIG_SYSFS |
| extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
| extern void bd_unlink_disk_holder(struct block_device *bdev, |
| struct gendisk *disk); |
| #else |
| static inline int bd_link_disk_holder(struct block_device *bdev, |
| struct gendisk *disk) |
| { |
| return 0; |
| } |
| static inline void bd_unlink_disk_holder(struct block_device *bdev, |
| struct gendisk *disk) |
| { |
| } |
| #endif |
| #endif |
| |
| /* fs/char_dev.c */ |
| #define CHRDEV_MAJOR_HASH_SIZE 255 |
| extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
| extern int register_chrdev_region(dev_t, unsigned, const char *); |
| extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
| unsigned int count, const char *name, |
| const struct file_operations *fops); |
| extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
| unsigned int count, const char *name); |
| extern void unregister_chrdev_region(dev_t, unsigned); |
| extern void chrdev_show(struct seq_file *,off_t); |
| |
| static inline int register_chrdev(unsigned int major, const char *name, |
| const struct file_operations *fops) |
| { |
| return __register_chrdev(major, 0, 256, name, fops); |
| } |
| |
| static inline void unregister_chrdev(unsigned int major, const char *name) |
| { |
| __unregister_chrdev(major, 0, 256, name); |
| } |
| |
| /* fs/block_dev.c */ |
| #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
| #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
| |
| #ifdef CONFIG_BLOCK |
| #define BLKDEV_MAJOR_HASH_SIZE 255 |
| extern const char *__bdevname(dev_t, char *buffer); |
| extern const char *bdevname(struct block_device *bdev, char *buffer); |
| extern struct block_device *lookup_bdev(const char *); |
| extern void blkdev_show(struct seq_file *,off_t); |
| |
| #else |
| #define BLKDEV_MAJOR_HASH_SIZE 0 |
| #endif |
| |
| extern void init_special_inode(struct inode *, umode_t, dev_t); |
| |
| /* Invalid inode operations -- fs/bad_inode.c */ |
| extern void make_bad_inode(struct inode *); |
| extern int is_bad_inode(struct inode *); |
| |
| extern const struct file_operations read_pipefifo_fops; |
| extern const struct file_operations write_pipefifo_fops; |
| extern const struct file_operations rdwr_pipefifo_fops; |
| |
| extern int fs_may_remount_ro(struct super_block *); |
| |
| #ifdef CONFIG_BLOCK |
| /* |
| * return READ, READA, or WRITE |
| */ |
| #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
| |
| /* |
| * return data direction, READ or WRITE |
| */ |
| #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
| |
| extern void check_disk_size_change(struct gendisk *disk, |
| struct block_device *bdev); |
| extern int revalidate_disk(struct gendisk *); |
| extern int check_disk_change(struct block_device *); |
| extern int __invalidate_device(struct block_device *, bool); |
| extern int invalidate_partition(struct gendisk *, int); |
| #endif |
| unsigned long invalidate_mapping_pages(struct address_space *mapping, |
| pgoff_t start, pgoff_t end); |
| |
| static inline void invalidate_remote_inode(struct inode *inode) |
| { |
| if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| S_ISLNK(inode->i_mode)) |
| invalidate_mapping_pages(inode->i_mapping, 0, -1); |
| } |
| extern int invalidate_inode_pages2(struct address_space *mapping); |
| extern int invalidate_inode_pages2_range(struct address_space *mapping, |
| pgoff_t start, pgoff_t end); |
| extern int write_inode_now(struct inode *, int); |
| extern int filemap_fdatawrite(struct address_space *); |
| extern int filemap_flush(struct address_space *); |
| extern int filemap_fdatawait(struct address_space *); |
| extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
| loff_t lend); |
| extern int filemap_write_and_wait(struct address_space *mapping); |
| extern int filemap_write_and_wait_range(struct address_space *mapping, |
| loff_t lstart, loff_t lend); |
| extern int __filemap_fdatawrite_range(struct address_space *mapping, |
| loff_t start, loff_t end, int sync_mode); |
| extern int filemap_fdatawrite_range(struct address_space *mapping, |
| loff_t start, loff_t end); |
| |
| extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
| int datasync); |
| extern int vfs_fsync(struct file *file, int datasync); |
| extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); |
| extern void sync_supers(void); |
| extern void emergency_sync(void); |
| extern void emergency_remount(void); |
| #ifdef CONFIG_BLOCK |
| extern sector_t bmap(struct inode *, sector_t); |
| #endif |
| extern int notify_change(struct dentry *, struct iattr *); |
| extern int inode_permission(struct inode *, int); |
| extern int generic_permission(struct inode *, int, unsigned int, |
| int (*check_acl)(struct inode *, int, unsigned int)); |
| |
| static inline bool execute_ok(struct inode *inode) |
| { |
| return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
| } |
| |
| extern int get_write_access(struct inode *); |
| extern int deny_write_access(struct file *); |
| static inline void put_write_access(struct inode * inode) |
| { |
| atomic_dec(&inode->i_writecount); |
| } |
| static inline void allow_write_access(struct file *file) |
| { |
| if (file) |
| atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
| } |
| #ifdef CONFIG_IMA |
| static inline void i_readcount_dec(struct inode *inode) |
| { |
| BUG_ON(!atomic_read(&inode->i_readcount)); |
| atomic_dec(&inode->i_readcount); |
| } |
| static inline void i_readcount_inc(struct inode *inode) |
| { |
| atomic_inc(&inode->i_readcount); |
| } |
| #else |
| static inline void i_readcount_dec(struct inode *inode) |
| { |
| return; |
| } |
| static inline void i_readcount_inc(struct inode *inode) |
| { |
| return; |
| } |
| #endif |
| extern int do_pipe_flags(int *, int); |
| extern struct file *create_read_pipe(struct file *f, int flags); |
| extern struct file *create_write_pipe(int flags); |
| extern void free_write_pipe(struct file *); |
| |
| extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
| extern struct file * open_exec(const char *); |
| |
| /* fs/dcache.c -- generic fs support functions */ |
| extern int is_subdir(struct dentry *, struct dentry *); |
| extern int path_is_under(struct path *, struct path *); |
| extern ino_t find_inode_number(struct dentry *, struct qstr *); |
| |
| #include <linux/err.h> |
| |
| /* needed for stackable file system support */ |
| extern loff_t default_llseek(struct file *file, loff_t offset, int origin); |
| |
| extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); |
| |
| extern int inode_init_always(struct super_block *, struct inode *); |
| extern void inode_init_once(struct inode *); |
| extern void address_space_init_once(struct address_space *mapping); |
| extern void ihold(struct inode * inode); |
| extern void iput(struct inode *); |
| extern struct inode * igrab(struct inode *); |
| extern ino_t iunique(struct super_block *, ino_t); |
| extern int inode_needs_sync(struct inode *inode); |
| extern int generic_delete_inode(struct inode *inode); |
| extern int generic_drop_inode(struct inode *inode); |
| |
| extern struct inode *ilookup5_nowait(struct super_block *sb, |
| unsigned long hashval, int (*test)(struct inode *, void *), |
| void *data); |
| extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
| int (*test)(struct inode *, void *), void *data); |
| extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
| |
| extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
| extern struct inode * iget_locked(struct super_block *, unsigned long); |
| extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
| extern int insert_inode_locked(struct inode *); |
| extern void unlock_new_inode(struct inode *); |
| extern unsigned int get_next_ino(void); |
| |
| extern void __iget(struct inode * inode); |
| extern void iget_failed(struct inode *); |
| extern void end_writeback(struct inode *); |
| extern void __destroy_inode(struct inode *); |
| extern struct inode *new_inode(struct super_block *); |
| extern void free_inode_nonrcu(struct inode *inode); |
| extern int should_remove_suid(struct dentry *); |
| extern int file_remove_suid(struct file *); |
| |
| extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
| extern void remove_inode_hash(struct inode *); |
| static inline void insert_inode_hash(struct inode *inode) |
| { |
| __insert_inode_hash(inode, inode->i_ino); |
| } |
| extern void inode_sb_list_add(struct inode *inode); |
| |
| #ifdef CONFIG_BLOCK |
| extern void submit_bio(int, struct bio *); |
| extern int bdev_read_only(struct block_device *); |
| #endif |
| extern int set_blocksize(struct block_device *, int); |
| extern int sb_set_blocksize(struct super_block *, int); |
| extern int sb_min_blocksize(struct super_block *, int); |
| |
| extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
| extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
| extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); |
| int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
| extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
| extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, |
| loff_t *); |
| extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
| extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
| unsigned long *, loff_t, loff_t *, size_t, size_t); |
| extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, |
| unsigned long, loff_t, loff_t *, size_t, ssize_t); |
| extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); |
| extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); |
| extern int generic_segment_checks(const struct iovec *iov, |
| unsigned long *nr_segs, size_t *count, int access_flags); |
| |
| /* fs/block_dev.c */ |
| extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| unsigned long nr_segs, loff_t pos); |
| extern int blkdev_fsync(struct file *filp, int datasync); |
| |
| /* fs/splice.c */ |
| extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
| struct pipe_inode_info *, size_t, unsigned int); |
| extern ssize_t default_file_splice_read(struct file *, loff_t *, |
| struct pipe_inode_info *, size_t, unsigned int); |
| extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
| struct file *, loff_t *, size_t, unsigned int); |
| extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
| struct file *out, loff_t *, size_t len, unsigned int flags); |
| extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
| size_t len, unsigned int flags); |
| |
| extern void |
| file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
| extern loff_t noop_llseek(struct file *file, loff_t offset, int origin); |
| extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
| extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); |
| extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset, |
| int origin); |
| extern int generic_file_open(struct inode * inode, struct file * filp); |
| extern int nonseekable_open(struct inode * inode, struct file * filp); |
| |
| #ifdef CONFIG_FS_XIP |
| extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
| loff_t *ppos); |
| extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
| extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
| size_t len, loff_t *ppos); |
| extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
| #else |
| static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
| { |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_BLOCK |
| typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
| loff_t file_offset); |
| |
| enum { |
| /* need locking between buffered and direct access */ |
| DIO_LOCKING = 0x01, |
| |
| /* filesystem does not support filling holes */ |
| DIO_SKIP_HOLES = 0x02, |
| }; |
| |
| void dio_end_io(struct bio *bio, int error); |
| |
| ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
| struct block_device *bdev, const struct iovec *iov, loff_t offset, |
| unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
| dio_submit_t submit_io, int flags); |
| |
| static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
| struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
| loff_t offset, unsigned long nr_segs, get_block_t get_block, |
| dio_iodone_t end_io) |
| { |
| return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
| nr_segs, get_block, end_io, NULL, |
| DIO_LOCKING | DIO_SKIP_HOLES); |
| } |
| #endif |
| |
| extern const struct file_operations generic_ro_fops; |
| |
| #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
| |
| extern int vfs_readlink(struct dentry *, char __user *, int, const char *); |
| extern int vfs_follow_link(struct nameidata *, const char *); |
| extern int page_readlink(struct dentry *, char __user *, int); |
| extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
| extern void page_put_link(struct dentry *, struct nameidata *, void *); |
| extern int __page_symlink(struct inode *inode, const char *symname, int len, |
| int nofs); |
| extern int page_symlink(struct inode *inode, const char *symname, int len); |
| extern const struct inode_operations page_symlink_inode_operations; |
| extern int generic_readlink(struct dentry *, char __user *, int); |
| extern void generic_fillattr(struct inode *, struct kstat *); |
| extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| void __inode_add_bytes(struct inode *inode, loff_t bytes); |
| void inode_add_bytes(struct inode *inode, loff_t bytes); |
| void inode_sub_bytes(struct inode *inode, loff_t bytes); |
| loff_t inode_get_bytes(struct inode *inode); |
| void inode_set_bytes(struct inode *inode, loff_t bytes); |
| |
| extern int vfs_readdir(struct file *, filldir_t, void *); |
| |
| extern int vfs_stat(const char __user *, struct kstat *); |
| extern int vfs_lstat(const char __user *, struct kstat *); |
| extern int vfs_fstat(unsigned int, struct kstat *); |
| extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
| |
| extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
| unsigned long arg); |
| extern int __generic_block_fiemap(struct inode *inode, |
| struct fiemap_extent_info *fieinfo, |
| loff_t start, loff_t len, |
| get_block_t *get_block); |
| extern int generic_block_fiemap(struct inode *inode, |
| struct fiemap_extent_info *fieinfo, u64 start, |
| u64 len, get_block_t *get_block); |
| |
| extern void get_filesystem(struct file_system_type *fs); |
| extern void put_filesystem(struct file_system_type *fs); |
| extern struct file_system_type *get_fs_type(const char *name); |
| extern struct super_block *get_super(struct block_device *); |
| extern struct super_block *get_active_super(struct block_device *bdev); |
| extern struct super_block *user_get_super(dev_t); |
| extern void drop_super(struct super_block *sb); |
| extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
| |
| extern int dcache_dir_open(struct inode *, struct file *); |
| extern int dcache_dir_close(struct inode *, struct file *); |
| extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
| extern int dcache_readdir(struct file *, void *, filldir_t); |
| extern int simple_setattr(struct dentry *, struct iattr *); |
| extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| extern int simple_statfs(struct dentry *, struct kstatfs *); |
| extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
| extern int simple_unlink(struct inode *, struct dentry *); |
| extern int simple_rmdir(struct inode *, struct dentry *); |
| extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
| extern int noop_fsync(struct file *, int); |
| extern int simple_empty(struct dentry *); |
| extern int simple_readpage(struct file *file, struct page *page); |
| extern int simple_write_begin(struct file *file, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata); |
| extern int simple_write_end(struct file *file, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata); |
| |
| extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); |
| extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
| extern const struct file_operations simple_dir_operations; |
| extern const struct inode_operations simple_dir_inode_operations; |
| struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
| struct dentry *d_alloc_name(struct dentry *, const char *); |
| extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
| extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
| extern void simple_release_fs(struct vfsmount **mount, int *count); |
| |
| extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
| loff_t *ppos, const void *from, size_t available); |
| extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
| const void __user *from, size_t count); |
| |
| extern int generic_file_fsync(struct file *, int); |
| |
| extern int generic_check_addressable(unsigned, u64); |
| |
| #ifdef CONFIG_MIGRATION |
| extern int buffer_migrate_page(struct address_space *, |
| struct page *, struct page *); |
| #else |
| #define buffer_migrate_page NULL |
| #endif |
| |
| extern int inode_change_ok(const struct inode *, struct iattr *); |
| extern int inode_newsize_ok(const struct inode *, loff_t offset); |
| extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
| |
| extern void file_update_time(struct file *file); |
| |
| extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt); |
| extern void save_mount_options(struct super_block *sb, char *options); |
| extern void replace_mount_options(struct super_block *sb, char *options); |
| |
| static inline ino_t parent_ino(struct dentry *dentry) |
| { |
| ino_t res; |
| |
| /* |
| * Don't strictly need d_lock here? If the parent ino could change |
| * then surely we'd have a deeper race in the caller? |
| */ |
| spin_lock(&dentry->d_lock); |
| res = dentry->d_parent->d_inode->i_ino; |
| spin_unlock(&dentry->d_lock); |
| return res; |
| } |
| |
| /* Transaction based IO helpers */ |
| |
| /* |
| * An argresp is stored in an allocated page and holds the |
| * size of the argument or response, along with its content |
| */ |
| struct simple_transaction_argresp { |
| ssize_t size; |
| char data[0]; |
| }; |
| |
| #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
| |
| char *simple_transaction_get(struct file *file, const char __user *buf, |
| size_t size); |
| ssize_t simple_transaction_read(struct file *file, char __user *buf, |
| size_t size, loff_t *pos); |
| int simple_transaction_release(struct inode *inode, struct file *file); |
| |
| void simple_transaction_set(struct file *file, size_t n); |
| |
| /* |
| * simple attribute files |
| * |
| * These attributes behave similar to those in sysfs: |
| * |
| * Writing to an attribute immediately sets a value, an open file can be |
| * written to multiple times. |
| * |
| * Reading from an attribute creates a buffer from the value that might get |
| * read with multiple read calls. When the attribute has been read |
| * completely, no further read calls are possible until the file is opened |
| * again. |
| * |
| * All attributes contain a text representation of a numeric value |
| * that are accessed with the get() and set() functions. |
| */ |
| #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| static int __fops ## _open(struct inode *inode, struct file *file) \ |
| { \ |
| __simple_attr_check_format(__fmt, 0ull); \ |
| return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| } \ |
| static const struct file_operations __fops = { \ |
| .owner = THIS_MODULE, \ |
| .open = __fops ## _open, \ |
| .release = simple_attr_release, \ |
| .read = simple_attr_read, \ |
| .write = simple_attr_write, \ |
| .llseek = generic_file_llseek, \ |
| }; |
| |
| static inline void __attribute__((format(printf, 1, 2))) |
| __simple_attr_check_format(const char *fmt, ...) |
| { |
| /* don't do anything, just let the compiler check the arguments; */ |
| } |
| |
| int simple_attr_open(struct inode *inode, struct file *file, |
| int (*get)(void *, u64 *), int (*set)(void *, u64), |
| const char *fmt); |
| int simple_attr_release(struct inode *inode, struct file *file); |
| ssize_t simple_attr_read(struct file *file, char __user *buf, |
| size_t len, loff_t *ppos); |
| ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| size_t len, loff_t *ppos); |
| |
| struct ctl_table; |
| int proc_nr_files(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| int proc_nr_dentry(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| int proc_nr_inodes(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| int __init get_filesystem_list(char *buf); |
| |
| #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
| #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
| |
| #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
| #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
| (flag & __FMODE_NONOTIFY))) |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _LINUX_FS_H */ |