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| #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> | |
| /* | |
| * 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 | |
| /* And dynamically-tunable limits and defaults: */ | |
| struct files_stat_struct { | |
| int nr_files; /* read only */ | |
| int nr_free_files; /* read only */ | |
| int 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 | |
| /* | |
| * 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) | |
| /* | |
| * 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. | |
| * SWRITE Like WRITE, but a special case for ll_rw_block() that | |
| * tells it to lock the buffer first. Normally a buffer | |
| * must be locked before doing IO. | |
| * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down | |
| * the hint that someone will be waiting on this IO | |
| * shortly. The device must still be unplugged explicitly, | |
| * WRITE_SYNC_PLUG does not do this as we could be | |
| * submitting more writes before we actually wait on any | |
| * of them. | |
| * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device | |
| * immediately after submission. The write equivalent | |
| * of READ_SYNC. | |
| * WRITE_ODIRECT_PLUG Special case write for O_DIRECT only. | |
| * SWRITE_SYNC | |
| * SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer. | |
| * See SWRITE. | |
| * WRITE_BARRIER Like WRITE, but tells the block layer that all | |
| * previously submitted writes must be safely on storage | |
| * before this one is started. Also guarantees that when | |
| * this write is complete, it itself is also safely on | |
| * storage. Prevents reordering of writes on both sides | |
| * of this IO. | |
| * | |
| */ | |
| #define RW_MASK 1 | |
| #define RWA_MASK 2 | |
| #define READ 0 | |
| #define WRITE 1 | |
| #define READA 2 /* read-ahead - don't block if no resources */ | |
| #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ | |
| #define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) | |
| #define READ_META (READ | (1 << BIO_RW_META)) | |
| #define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) | |
| #define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) | |
| #define WRITE_ODIRECT_PLUG (WRITE | (1 << BIO_RW_SYNCIO)) | |
| #define WRITE_META (WRITE | (1 << BIO_RW_META)) | |
| #define SWRITE_SYNC_PLUG \ | |
| (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) | |
| #define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) | |
| #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER)) | |
| /* | |
| * These aren't really reads or writes, they pass down information about | |
| * parts of device that are now unused by the file system. | |
| */ | |
| #define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD)) | |
| #define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER)) | |
| #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_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 */ | |
| /* | |
| * 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) | |
| /* 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 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 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_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/kobject.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 <asm/atomic.h> | |
| #include <asm/byteorder.h> | |
| struct export_operations; | |
| struct hd_geometry; | |
| struct iovec; | |
| struct nameidata; | |
| struct kiocb; | |
| 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 int get_max_files(void); | |
| extern int sysctl_nr_open; | |
| extern struct inodes_stat_t inodes_stat; | |
| extern int leases_enable, lease_break_time; | |
| #ifdef CONFIG_DNOTIFY | |
| extern int dir_notify_enable; | |
| #endif | |
| 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); | |
| /* | |
| * 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 auxilary 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 *); | |
| void (*sync_page)(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); | |
| 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 *); | |
| }; | |
| /* | |
| * 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 */ | |
| } __attribute__((aligned(sizeof(long)))); | |
| /* | |
| * On most architectures that alignment is already the case; but | |
| * must be enforced here for CRIS, to let the least signficant 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 */ | |
| struct inode * bd_inode; /* will die */ | |
| struct super_block * bd_super; | |
| int bd_openers; | |
| struct mutex bd_mutex; /* open/close mutex */ | |
| struct list_head bd_inodes; | |
| void * bd_holder; | |
| int bd_holders; | |
| #ifdef CONFIG_SYSFS | |
| struct list_head bd_holder_list; | |
| #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 | |
| 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 { | |
| struct hlist_node i_hash; | |
| struct list_head i_list; /* backing dev IO list */ | |
| struct list_head i_sb_list; | |
| struct list_head i_dentry; | |
| unsigned long i_ino; | |
| atomic_t i_count; | |
| unsigned int i_nlink; | |
| uid_t i_uid; | |
| gid_t i_gid; | |
| 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; | |
| umode_t i_mode; | |
| spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ | |
| struct mutex i_mutex; | |
| struct rw_semaphore i_alloc_sem; | |
| const struct inode_operations *i_op; | |
| const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ | |
| struct super_block *i_sb; | |
| 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_mark_entries; /* fsnotify mark entries */ | |
| #endif | |
| #ifdef CONFIG_INOTIFY | |
| struct list_head inotify_watches; /* watches on this inode */ | |
| struct mutex inotify_mutex; /* protects the watches list */ | |
| #endif | |
| unsigned long i_state; | |
| unsigned long dirtied_when; /* jiffies of first dirtying */ | |
| unsigned int i_flags; | |
| 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 */ | |
| }; | |
| /* | |
| * 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 */ | |
| 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 | |
| }; | |
| extern spinlock_t files_lock; | |
| #define file_list_lock() spin_lock(&files_lock); | |
| #define file_list_unlock() spin_unlock(&files_lock); | |
| #define get_file(x) atomic_long_inc(&(x)->f_count) | |
| #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_copy_lock)(struct file_lock *, struct file_lock *); | |
| void (*fl_release_private)(struct file_lock *); | |
| void (*fl_break)(struct file_lock *); | |
| int (*fl_mylease)(struct file_lock *, 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 */ | |
| extern void locks_init_lock(struct file_lock *); | |
| 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); | |
| #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; | |
| } | |
| #endif /* !CONFIG_FILE_LOCKING */ | |
| struct fasync_struct { | |
| int magic; | |
| int fa_fd; | |
| struct fasync_struct *fa_next; /* singly linked list */ | |
| struct file *fa_file; | |
| }; | |
| #define FASYNC_MAGIC 0x4601 | |
| /* SMP safe fasync helpers: */ | |
| extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
| /* can be called from interrupts */ | |
| extern void kill_fasync(struct fasync_struct **, int, int); | |
| /* only for net: no internal synchronization */ | |
| 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; | |
| #define sb_entry(list) list_entry((list), struct super_block, s_list) | |
| #define S_BIAS (1<<30) | |
| 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; | |
| int s_need_sync; | |
| atomic_t s_active; | |
| #ifdef CONFIG_SECURITY | |
| void *s_security; | |
| #endif | |
| struct xattr_handler **s_xattr; | |
| struct list_head s_inodes; /* all inodes */ | |
| struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ | |
| struct list_head s_files; | |
| /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */ | |
| 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 */ | |
| 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 *s_options; | |
| }; | |
| 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) | |
| #define is_owner_or_cap(inode) \ | |
| ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER)) | |
| /* 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); | |
| /* | |
| * 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 *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: | |
| * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl | |
| * 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 *); | |
| int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); | |
| 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 *, struct dentry *, 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 **); | |
| }; | |
| struct inode_operations { | |
| int (*create) (struct inode *,struct dentry *,int, struct nameidata *); | |
| struct dentry * (*lookup) (struct inode *,struct dentry *, 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 *); | |
| int (*readlink) (struct dentry *, char __user *,int); | |
| void * (*follow_link) (struct dentry *, struct nameidata *); | |
| void (*put_link) (struct dentry *, struct nameidata *, void *); | |
| void (*truncate) (struct inode *); | |
| int (*permission) (struct inode *, int); | |
| int (*check_acl)(struct inode *, int); | |
| 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); | |
| long (*fallocate)(struct inode *inode, int mode, loff_t offset, | |
| loff_t len); | |
| int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, | |
| u64 len); | |
| }; | |
| 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); | |
| void (*drop_inode) (struct inode *); | |
| void (*delete_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 (*clear_inode) (struct inode *); | |
| void (*umount_begin) (struct super_block *); | |
| int (*show_options)(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_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 Set by clear_inode(). In this state the inode is clean | |
| * and can be destroyed. | |
| * | |
| * 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 | |
| #define I_DIRTY_DATASYNC 2 | |
| #define I_DIRTY_PAGES 4 | |
| #define __I_NEW 3 | |
| #define I_NEW (1 << __I_NEW) | |
| #define I_WILL_FREE 16 | |
| #define I_FREEING 32 | |
| #define I_CLEAR 64 | |
| #define __I_SYNC 7 | |
| #define I_SYNC (1 << __I_SYNC) | |
| #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); | |
| struct file_system_type { | |
| const char *name; | |
| int fs_flags; | |
| int (*get_sb) (struct file_system_type *, int, | |
| const char *, void *, struct vfsmount *); | |
| 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 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 int get_sb_ns(struct file_system_type *fs_type, int flags, void *data, | |
| int (*fill_super)(struct super_block *, void *, int), | |
| struct vfsmount *mnt); | |
| extern int get_sb_bdev(struct file_system_type *fs_type, | |
| int flags, const char *dev_name, void *data, | |
| int (*fill_super)(struct super_block *, void *, int), | |
| struct vfsmount *mnt); | |
| extern int get_sb_single(struct file_system_type *fs_type, | |
| int flags, void *data, | |
| int (*fill_super)(struct super_block *, void *, int), | |
| struct vfsmount *mnt); | |
| extern int get_sb_nodev(struct file_system_type *fs_type, | |
| int flags, void *data, | |
| int (*fill_super)(struct super_block *, void *, int), | |
| struct vfsmount *mnt); | |
| 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 int get_sb_pseudo(struct file_system_type *, char *, | |
| const struct super_operations *ops, unsigned long, | |
| struct vfsmount *mnt); | |
| extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); | |
| int __put_super_and_need_restart(struct super_block *sb); | |
| void put_super(struct super_block *sb); | |
| /* 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 dentry *, struct kstatfs *); | |
| extern int current_umask(void); | |
| /* /sys/fs */ | |
| extern struct kobject *fs_kobj; | |
| 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 * 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 struct block_device *open_by_devnum(dev_t, fmode_t); | |
| 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 *, fmode_t); | |
| extern int blkdev_put(struct block_device *, fmode_t); | |
| extern int bd_claim(struct block_device *, void *); | |
| extern void bd_release(struct block_device *); | |
| #ifdef CONFIG_SYSFS | |
| extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); | |
| extern void bd_release_from_disk(struct block_device *, struct gendisk *); | |
| #else | |
| #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) | |
| #define bd_release_from_disk(bdev, disk) bd_release(bdev) | |
| #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 struct block_device *open_bdev_exclusive(const char *, fmode_t, void *); | |
| extern void close_bdev_exclusive(struct block_device *, fmode_t); | |
| 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 *); | |
| extern int invalidate_partition(struct gendisk *, int); | |
| #endif | |
| extern int invalidate_inodes(struct super_block *); | |
| 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, struct dentry *dentry, | |
| loff_t start, loff_t end, int datasync); | |
| extern int vfs_fsync(struct file *file, struct dentry *dentry, 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, | |
| int (*check_acl)(struct inode *, 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); | |
| } | |
| 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 struct file *do_filp_open(int dfd, const char *pathname, | |
| int open_flag, int mode, int acc_mode); | |
| extern int may_open(struct path *, int, int); | |
| 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 inode_add_to_lists(struct super_block *, struct 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 void generic_delete_inode(struct inode *inode); | |
| extern void generic_drop_inode(struct inode *inode); | |
| extern int generic_detach_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 void __iget(struct inode * inode); | |
| extern void iget_failed(struct inode *); | |
| extern void clear_inode(struct inode *); | |
| extern void destroy_inode(struct inode *); | |
| extern void __destroy_inode(struct inode *); | |
| extern struct inode *new_inode(struct super_block *); | |
| 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 file_move(struct file *f, struct list_head *list); | |
| extern void file_kill(struct file *f); | |
| #ifdef CONFIG_BLOCK | |
| struct bio; | |
| 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, struct dentry *dentry, 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 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 | |
| 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, | |
| int lock_type); | |
| enum { | |
| /* need locking between buffered and direct access */ | |
| DIO_LOCKING = 0x01, | |
| /* filesystem does not support filling holes */ | |
| DIO_SKIP_HOLES = 0x02, | |
| }; | |
| 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, | |
| DIO_LOCKING | DIO_SKIP_HOLES); | |
| } | |
| static inline ssize_t blockdev_direct_IO_no_locking(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, 0); | |
| } | |
| #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(char __user *, struct kstat *); | |
| extern int vfs_lstat(char __user *, struct kstat *); | |
| extern int vfs_fstat(unsigned int, struct kstat *); | |
| extern int vfs_fstatat(int , 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 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_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 simple_sync_file(struct file *, struct dentry *, 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 *, int, 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 int simple_fsync(struct file *, struct dentry *, int); | |
| #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 int __must_check inode_setattr(struct inode *, struct iattr *); | |
| 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; | |
| 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, \ | |
| }; | |
| 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 __init get_filesystem_list(char *buf); | |
| #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) | |
| #define OPEN_FMODE(flag) ((__force fmode_t)((flag + 1) & O_ACCMODE)) | |
| #endif /* __KERNEL__ */ | |
| #endif /* _LINUX_FS_H */ |