Mac Easy 2010 May

home *** CD-ROM | disk | FTP | other *** search

/ Mac Easy 2010 May / Mac Life Ubuntu.iso / casper / filesystem.squashfs / usr / src / linux-headers-2.6.28-15 / include / linux / fs.h < prev next >

Wrap

C/C++ Source or Header | 2009-09-09 | 78.0 KB | 2,244 lines

#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 extern int sysctl_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 */ }; extern struct files_stat_struct files_stat; extern int get_max_files(void); struct inodes_stat_t { int nr_inodes; int nr_unused; int dummy[5]; /* padding for sysctl ABI compatibility */ }; extern struct inodes_stat_t inodes_stat; extern int leases_enable, lease_break_time; #ifdef CONFIG_DNOTIFY extern int dir_notify_enable; #endif #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)1) /* file is open for writing */ #define FMODE_WRITE ((__force fmode_t)2) /* file is seekable */ #define FMODE_LSEEK ((__force fmode_t)4) /* file can be accessed using pread */ #define FMODE_PREAD ((__force fmode_t)8) /* file can be accessed using pwrite */ #define FMODE_PWRITE ((__force fmode_t)16) /* File is opened for execution with sys_execve / sys_uselib */ #define FMODE_EXEC ((__force fmode_t)32) /* File is opened with O_NDELAY (only set for block devices) */ #define FMODE_NDELAY ((__force fmode_t)64) /* File is opened with O_EXCL (only set for block devices) */ #define FMODE_EXCL ((__force fmode_t)128) /* File is opened using open(.., 3, ..) and is writeable only for ioctls (specialy hack for floppy.c) */ #define FMODE_WRITE_IOCTL ((__force fmode_t)256) #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_SYNC)) #define READ_META (READ | (1 << BIO_RW_META)) #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) #define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC)) #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER)) #define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD) #define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (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_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 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 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; extern void __init inode_init(void); extern void __init inode_init_early(void); extern void __init files_init(unsigned long); 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). * * NOTE: With patches.apparmor/fsetattr.diff applied, this is * for compatibility with external file system modules only. There * should not be any in-kernel users left. */ 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); }; /* * 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 */ int bd_openers; struct mutex bd_mutex; /* open/close mutex */ struct semaphore bd_mount_sem; 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; struct backing_dev_info *bd_inode_backing_dev_info; /* * 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; }; /* * 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 inode { struct hlist_node i_hash; struct list_head i_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; 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; unsigned int i_blkbits; 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; }; int i_cindex; __u32 i_generation; #ifdef CONFIG_DNOTIFY unsigned long i_dnotify_mask; /* Directory notify events */ struct dnotify_struct *i_dnotify; /* for directory notifications */ #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 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 }; extern void inode_double_lock(struct inode *inode1, struct inode *inode2); extern void inode_double_unlock(struct inode *inode1, struct inode *inode2); /* * 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 */ 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; atomic_long_t f_count; unsigned int f_flags; fmode_t f_mode; loff_t f_pos; struct fown_struct f_owner; unsigned int f_uid, f_gid; 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; spinlock_t f_ep_lock; #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 */ struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ 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); /* fs/sync.c */ extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset, loff_t endbyte, unsigned int flags); #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 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 */ #define fcntl_getlk(a, b) ({ -EINVAL; }) #define fcntl_setlk(a, b, c, d) ({ -EACCES; }) #if BITS_PER_LONG == 32 #define fcntl_getlk64(a, b) ({ -EINVAL; }) #define fcntl_setlk64(a, b, c, d) ({ -EACCES; }) #endif #define fcntl_setlease(a, b, c) ({ 0; }) #define fcntl_getlease(a) ({ 0; }) #define locks_init_lock(a) ({ }) #define __locks_copy_lock(a, b) ({ }) #define locks_copy_lock(a, b) ({ }) #define locks_remove_posix(a, b) ({ }) #define locks_remove_flock(a) ({ }) #define posix_test_lock(a, b) ({ 0; }) #define posix_lock_file(a, b, c) ({ -ENOLCK; }) #define posix_lock_file_wait(a, b) ({ -ENOLCK; }) #define posix_unblock_lock(a, b) (-ENOENT) #define vfs_test_lock(a, b) ({ 0; }) #define vfs_lock_file(a, b, c, d) (-ENOLCK) #define vfs_cancel_lock(a, b) ({ 0; }) #define flock_lock_file_wait(a, b) ({ -ENOLCK; }) #define __break_lease(a, b) ({ 0; }) #define lease_get_mtime(a, b) ({ }) #define generic_setlease(a, b, c) ({ -EINVAL; }) #define vfs_setlease(a, b, c) ({ -EINVAL; }) #define lease_modify(a, b) ({ -EINVAL; }) #define lock_may_read(a, b, c) ({ 1; }) #define lock_may_write(a, b, c) ({ 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 */ 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 long s_blocksize; unsigned char s_blocksize_bits; unsigned char s_dirt; unsigned long long s_maxbytes; /* Max file size */ struct file_system_type *s_type; const struct super_operations *s_op; struct dquot_operations *dq_op; 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_fs; atomic_t s_active; #ifdef CONFIG_SECURITY void *s_security; #endif struct xattr_handler **s_xattr; struct list_head s_inodes; /* all inodes */ struct list_head s_dirty; /* dirty inodes */ struct list_head s_io; /* parked for writeback */ struct list_head s_more_io; /* parked for more writeback */ 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 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; /* * 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 */ /* Granularity of c/m/atime in ns. Cannot be worse than a second */ u32 s_time_gran; /* * 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_permission(struct nameidata *, int); extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); extern int vfs_mkdir(struct inode *, struct dentry *, struct vfsmount *, int); extern int vfs_mknod(struct inode *, struct dentry *, struct vfsmount *, int, dev_t); extern int vfs_symlink(struct inode *, struct dentry *, struct vfsmount *, const char *); extern int vfs_link(struct dentry *, struct vfsmount *, struct inode *, struct dentry *, struct vfsmount *); extern int vfs_rmdir(struct inode *, struct dentry *, struct vfsmount *); extern int vfs_unlink(struct inode *, struct dentry *, struct vfsmount *); extern int vfs_rename(struct inode *, struct dentry *, struct vfsmount *, struct inode *, struct dentry *, struct vfsmount *); /* * VFS dentry helper functions. */ extern void dentry_unhash(struct dentry *dentry); /* * VFS file helper functions. */ extern int file_permission(struct file *, int); /* * VFS path helper functions. */ extern int path_permission(struct path *, 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 #define OSYNC_METADATA (1<<0) #define OSYNC_DATA (1<<1) #define OSYNC_INODE (1<<2) int generic_osync_inode(struct inode *, struct address_space *, int); /* * 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 (*dir_notify)(struct file *filp, unsigned long arg); 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 **); int (*fsetattr)(struct file *, struct iattr *); }; 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 (*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 *, int); 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); void (*write_super_lockfs) (struct super_block *); void (*unlockfs) (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 }; /* * 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_LOCK 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 get_new_inode() sets i_state to I_LOCK|I_NEW. Both * are cleared by unlock_new_inode(), called from iget(). * 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_LOCK is used for waiting. * * I_LOCK Serves as both a mutex and completion notification. * New inodes set I_LOCK. If two processes both create * the same inode, one of them will release its inode and * wait for I_LOCK to be released before returning. * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can * also cause waiting on I_LOCK, without I_LOCK actually * being set. find_inode() uses this to prevent returning * nearly-dead inodes. * I_SYNC Similar to I_LOCK, but limited in scope to writeback * of inode dirty data. Having a separate lock for this * purpose reduces latency and prevents some filesystem- * specific deadlocks. * * Q: What is the difference between I_WILL_FREE and I_FREEING? * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on * I_CLEAR? If not, why? */ #define I_DIRTY_SYNC 1 #define I_DIRTY_DATASYNC 2 #define I_DIRTY_PAGES 4 #define I_NEW 8 #define I_WILL_FREE 16 #define I_FREEING 32 #define I_CLEAR 64 #define __I_LOCK 7 #define I_LOCK (1 << __I_LOCK) #define __I_SYNC 8 #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_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); 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 int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); int __put_super_and_need_restart(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 vfsmount *, struct dentry *); extern void drop_collected_mounts(struct vfsmount *); extern int vfs_statfs(struct dentry *, struct kstatfs *); /* /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 */ #define locks_mandatory_locked(a) ({ 0; }) #define locks_mandatory_area(a, b, c, d, e) ({ 0; }) #define __mandatory_lock(a) ({ 0; }) #define mandatory_lock(a) ({ 0; }) #define locks_verify_locked(a) ({ 0; }) #define locks_verify_truncate(a, b, c) ({ 0; }) #define break_lease(a, b) ({ 0; }) #endif /* CONFIG_FILE_LOCKING */ /* fs/open.c */ extern int do_truncate(struct dentry *, struct vfsmount *, loff_t start, unsigned int time_attrs, struct file *filp); 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); extern int filp_close(struct file *, fl_owner_t id); extern char * getname(const char __user *); /* 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() kmem_cache_alloc(names_cachep, 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 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); #else static inline void bd_forget(struct inode *inode) {} #endif 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, const char *, const struct file_operations *); extern void unregister_chrdev(unsigned int, const char *); extern void unregister_chrdev_region(dev_t, unsigned); extern void chrdev_show(struct seq_file *,off_t); /* 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, bool be_atomic); unsigned long invalidate_mapping_pages(struct address_space *mapping, pgoff_t start, pgoff_t end); static inline unsigned long __deprecated invalidate_inode_pages(struct address_space *mapping) { return invalidate_mapping_pages(mapping, 0, ~0UL); } 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 void generic_sync_sb_inodes(struct super_block *sb, struct writeback_control *wbc); 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_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 wait_on_page_writeback_range(struct address_space *mapping, pgoff_t start, pgoff_t end); 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 long do_fsync(struct file *file, int datasync); extern void sync_supers(void); extern void sync_filesystems(int wait); extern void __fsync_super(struct super_block *sb); extern void emergency_sync(void); extern void emergency_remount(void); extern int do_remount_sb(struct super_block *sb, int flags, void *data, int force); #ifdef CONFIG_BLOCK extern sector_t bmap(struct inode *, sector_t); #endif extern int notify_change(struct dentry *, struct vfsmount *, struct iattr *); extern int fnotify_change(struct dentry *, struct vfsmount *, struct iattr *, struct file *); 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(int *); 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); extern int may_open(struct nameidata *, int, int); extern int kernel_read(struct file *, unsigned long, 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 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 void inode_init_once(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 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 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 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 struct file * get_empty_filp(void); 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 sb_has_dirty_inodes(struct super_block *); 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_nolock(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/splice.c */ extern ssize_t generic_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_file_splice_write_nolock(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 { DIO_LOCKING = 1, /* need locking between buffered and direct access */ DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ }; 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); } 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, DIO_NO_LOCKING); } static inline ssize_t blockdev_direct_IO_own_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, DIO_OWN_LOCKING); } #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_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_stat_fd(int dfd, char __user *, struct kstat *); extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *); extern int vfs_fstat(unsigned int, struct kstat *); 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, 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 *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_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to); 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); #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(struct inode *, struct iattr *); 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); 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); static inline void simple_transaction_set(struct file *file, size_t n) { struct simple_transaction_argresp *ar = file->private_data; BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); /* * The barrier ensures that ar->size will really remain zero until * ar->data is ready for reading. */ smp_mb(); ar->size = 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 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); #ifdef CONFIG_SECURITY static inline char *alloc_secdata(void) { return (char *)get_zeroed_page(GFP_KERNEL); } static inline void free_secdata(void *secdata) { free_page((unsigned long)secdata); } #else static inline char *alloc_secdata(void) { return (char *)1; } static inline void free_secdata(void *secdata) { } #endif /* CONFIG_SECURITY */ struct ctl_table; int proc_nr_files(struct ctl_table *table, int write, struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos); int get_filesystem_list(char * buf); #endif /* __KERNEL__ */ #endif /* _LINUX_FS_H */