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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 NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
- #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 */
- /* 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];
- };
- 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 FMODE_READ 1
- #define FMODE_WRITE 2
- /* Internal kernel extensions */
- #define FMODE_LSEEK 4
- #define FMODE_PREAD 8
- #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
- /* File is being opened for execution. Primary users of this flag are
- distributed filesystems that can use it to achieve correct ETXTBUSY
- behavior for cross-node execution/opening_for_writing of files */
- #define FMODE_EXEC 16
- #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 WRITE_BARRIER ((1 << BIO_RW) | (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_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_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)
- /*
- * 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_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 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_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/namei.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 <asm/atomic.h>
- #include <asm/semaphore.h>
- #include <asm/byteorder.h>
- 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(unsigned long);
- extern void __init inode_init_early(void);
- extern void __init mnt_init(unsigned long);
- 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
- #define ATTR_UID 2
- #define ATTR_GID 4
- #define ATTR_SIZE 8
- #define ATTR_ATIME 16
- #define ATTR_MTIME 32
- #define ATTR_CTIME 64
- #define ATTR_ATIME_SET 128
- #define ATTR_MTIME_SET 256
- #define ATTR_FORCE 512 /* Not a change, but a change it */
- #define ATTR_ATTR_FLAG 1024
- #define ATTR_KILL_SUID 2048
- #define ATTR_KILL_SGID 4096
- #define ATTR_FILE 8192
- /*
- * 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(), prepare_write(), and commit_write().
- *
- * 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,
- };
- /*
- * oh the beauties of C type declarations.
- */
- struct page;
- struct address_space;
- struct writeback_control;
- 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);
- /*
- * ext3 requires that a successful prepare_write() call be followed
- * by a commit_write() call - they must be balanced
- */
- int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
- int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
- /* 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);
- struct page* (*get_xip_page)(struct address_space *, sector_t,
- int);
- /* migrate the contents of a page to the specified target */
- int (*migratepage) (struct address_space *,
- struct page *, struct page *);
- int (*launder_page) (struct page *);
- };
- 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 */
- rwlock_t tree_lock; /* and rwlock 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;
- unsigned long 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 {
- unsigned long start; /* Current window */
- unsigned long size;
- unsigned long flags; /* ra flags RA_FLAG_xxx*/
- unsigned long cache_hit; /* cache hit count*/
- unsigned long prev_page; /* Cache last read() position */
- unsigned long ahead_start; /* Ahead window */
- unsigned long ahead_size;
- unsigned long ra_pages; /* Maximum readahead window */
- unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
- unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
- };
- #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
- #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
- 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_t f_count;
- unsigned int f_flags;
- mode_t f_mode;
- loff_t f_pos;
- struct fown_struct f_owner;
- unsigned int f_uid, f_gid;
- struct file_ra_state f_ra;
- unsigned long 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;
- };
- 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_inc(&(x)->f_count)
- #define file_count(x) atomic_read(&(x)->f_count)
- #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 */
- /*
- * 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_insert)(struct file_lock *); /* lock insertion callback */
- void (*fl_remove)(struct file_lock *); /* lock removal callback */
- 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 */
- 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);
- };
- /* 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 int fl_pid;
- wait_queue_head_t fl_wait;
- struct file *fl_file;
- unsigned char fl_flags;
- unsigned char fl_type;
- 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;
- } 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 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 void send_sigio(struct fown_struct *fown, int fd, int band);
- extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
- extern int fcntl_getlease(struct file *filp);
- /* fs/sync.c */
- extern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte,
- unsigned int flags);
- /* 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_remove_posix(struct file *, fl_owner_t);
- extern void locks_remove_flock(struct file *);
- extern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *);
- extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *);
- extern int posix_lock_file(struct file *, 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 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 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);
- 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;
- 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_syncing;
- 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 hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
- struct list_head s_files;
- struct block_device *s_bdev;
- 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 */
- /*
- * 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;
- };
- 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)
- /* 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 *, int);
- extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
- extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
- 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);
- /*
- * 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 {
- int (*open) (struct inode *, struct file *);
- int (*release) (struct inode *, struct file *);
- int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
- long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
- long (*compat_ioctl) (struct file *, unsigned, unsigned long);
- int (*direct_access) (struct block_device *, sector_t, unsigned long *);
- int (*media_changed) (struct gendisk *);
- int (*revalidate_disk) (struct gendisk *);
- int (*getgeo)(struct block_device *, struct hd_geometry *);
- struct module *owner;
- };
- /*
- * "descriptor" for what we're up to with a read for sendfile().
- * 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);
- /* 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 (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
- 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);
- };
- 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, struct nameidata *);
- 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);
- };
- 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 *);
- /*
- * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
- * without the big kernel lock held in all filesystems.
- */
- struct super_operations {
- struct inode *(*alloc_inode)(struct super_block *sb);
- void (*destroy_inode)(struct inode *);
- void (*read_inode) (struct inode *);
-
- void (*dirty_inode) (struct inode *);
- int (*write_inode) (struct inode *, int);
- void (*put_inode) (struct inode *);
- 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 vfsmount *, int);
- 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. */
- #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
- #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
- #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
- #define __I_LOCK 3
- #define I_LOCK (1 << __I_LOCK)
- #define I_FREEING 16
- #define I_CLEAR 32
- #define I_NEW 64
- #define I_WILL_FREE 128
- #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);
- }
- 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);
- }
- static inline void drop_nlink(struct inode *inode)
- {
- inode->i_nlink--;
- }
- 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);
- }
- 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 export_operations - for nfsd to communicate with file systems
- * @decode_fh: decode a file handle fragment and return a &struct dentry
- * @encode_fh: encode a file handle fragment from a dentry
- * @get_name: find the name for a given inode in a given directory
- * @get_parent: find the parent of a given directory
- * @get_dentry: find a dentry for the inode given a file handle sub-fragment
- * @find_exported_dentry:
- * set by the exporting module to a standard helper function.
- *
- * Description:
- * The export_operations structure provides a means for nfsd to communicate
- * with a particular exported file system - particularly enabling nfsd and
- * the filesystem to co-operate when dealing with file handles.
- *
- * export_operations contains two basic operation for dealing with file
- * handles, decode_fh() and encode_fh(), and allows for some other
- * operations to be defined which standard helper routines use to get
- * specific information from the filesystem.
- *
- * nfsd encodes information use to determine which filesystem a filehandle
- * applies to in the initial part of the file handle. The remainder, termed
- * a file handle fragment, is controlled completely by the filesystem. The
- * standard helper routines assume that this fragment will contain one or
- * two sub-fragments, one which identifies the file, and one which may be
- * used to identify the (a) directory containing the file.
- *
- * In some situations, nfsd needs to get a dentry which is connected into a
- * specific part of the file tree. To allow for this, it passes the
- * function acceptable() together with a @context which can be used to see
- * if the dentry is acceptable. As there can be multiple dentrys for a
- * given file, the filesystem should check each one for acceptability before
- * looking for the next. As soon as an acceptable one is found, it should
- * be returned.
- *
- * decode_fh:
- * @decode_fh is given a &struct super_block (@sb), a file handle fragment
- * (@fh, @fh_len) and an acceptability testing function (@acceptable,
- * @context). It should return a &struct dentry which refers to the same
- * file that the file handle fragment refers to, and which passes the
- * acceptability test. If it cannot, it should return a %NULL pointer if
- * the file was found but no acceptable &dentries were available, or a
- * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
- * %ENOMEM).
- *
- * encode_fh:
- * @encode_fh should store in the file handle fragment @fh (using at most
- * @max_len bytes) information that can be used by @decode_fh to recover the
- * file refered to by the &struct dentry @de. If the @connectable flag is
- * set, the encode_fh() should store sufficient information so that a good
- * attempt can be made to find not only the file but also it's place in the
- * filesystem. This typically means storing a reference to de->d_parent in
- * the filehandle fragment. encode_fh() should return the number of bytes
- * stored or a negative error code such as %-ENOSPC
- *
- * get_name:
- * @get_name should find a name for the given @child in the given @parent
- * directory. The name should be stored in the @name (with the
- * understanding that it is already pointing to a a %NAME_MAX+1 sized
- * buffer. get_name() should return %0 on success, a negative error code
- * or error. @get_name will be called without @parent->i_mutex held.
- *
- * get_parent:
- * @get_parent should find the parent directory for the given @child which
- * is also a directory. In the event that it cannot be found, or storage
- * space cannot be allocated, a %ERR_PTR should be returned.
- *
- * get_dentry:
- * Given a &super_block (@sb) and a pointer to a file-system specific inode
- * identifier, possibly an inode number, (@inump) get_dentry() should find
- * the identified inode and return a dentry for that inode. Any suitable
- * dentry can be returned including, if necessary, a new dentry created with
- * d_alloc_root. The caller can then find any other extant dentrys by
- * following the d_alias links. If a new dentry was created using
- * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
- * should be d_rehash()ed.
- *
- * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
- * can be returned. The @inump will be whatever was passed to
- * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
- *
- * Locking rules:
- * get_parent is called with child->d_inode->i_mutex down
- * get_name is not (which is possibly inconsistent)
- */
- struct export_operations {
- struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
- int (*acceptable)(void *context, struct dentry *de),
- void *context);
- int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
- int connectable);
- /* the following are only called from the filesystem itself */
- int (*get_name)(struct dentry *parent, char *name,
- struct dentry *child);
- struct dentry * (*get_parent)(struct dentry *child);
- struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
- /* This is set by the exporting module to a standard helper */
- struct dentry * (*find_exported_dentry)(
- struct super_block *sb, void *obj, void *parent,
- int (*acceptable)(void *context, struct dentry *de),
- void *context);
- };
- extern struct dentry *
- find_exported_dentry(struct super_block *sb, void *obj, void *parent,
- int (*acceptable)(void *context, struct dentry *de),
- void *context);
- 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;
- };
- 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(struct super_block *sb);
- int __put_super_and_need_restart(struct super_block *sb);
- void unnamed_dev_init(void);
- /* 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(struct file_system_type *);
- extern int may_umount_tree(struct vfsmount *);
- extern int may_umount(struct vfsmount *);
- extern void umount_tree(struct vfsmount *, int, struct list_head *);
- extern void release_mounts(struct list_head *);
- extern long do_mount(char *, char *, char *, unsigned long, void *);
- extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
- extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
- struct vfsmount *);
- extern int vfs_statfs(struct dentry *, struct kstatfs *);
- /* /sys/fs */
- extern struct subsystem fs_subsys;
- #define FLOCK_VERIFY_READ 1
- #define FLOCK_VERIFY_WRITE 2
- 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.
- */
- #define MANDATORY_LOCK(inode) \
- (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
- static inline int locks_verify_locked(struct inode *inode)
- {
- if (MANDATORY_LOCK(inode))
- return locks_mandatory_locked(inode);
- return 0;
- }
- extern int rw_verify_area(int, struct file *, loff_t *, size_t);
- 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;
- }
- /* fs/open.c */
- extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
- struct file *filp);
- extern long do_sys_open(int fdf, 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 int 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, unsigned);
- extern const struct address_space_operations def_blk_aops;
- #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 inode *, struct file *, unsigned, unsigned long);
- extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
- struct gendisk *disk, unsigned cmd,
- unsigned long arg);
- extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
- extern int blkdev_get(struct block_device *, mode_t, unsigned);
- extern int blkdev_put(struct block_device *);
- 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 int unregister_chrdev(unsigned int, const char *);
- extern void unregister_chrdev_region(dev_t, unsigned);
- extern int chrdev_open(struct inode *, struct file *);
- extern void chrdev_show(struct seq_file *,off_t);
- /* fs/block_dev.c */
- #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
- #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_excl(const char *, int, void *);
- extern void close_bdev_excl(struct block_device *);
- 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_fifo_fops;
- extern const struct file_operations write_fifo_fops;
- extern const struct file_operations rdwr_fifo_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 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 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 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 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 iattr *);
- extern int permission(struct inode *, int, struct nameidata *);
- extern int generic_permission(struct inode *, int,
- int (*check_acl)(struct inode *, int));
- 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 struct file *create_read_pipe(struct file *f);
- extern struct file *create_write_pipe(void);
- extern void free_write_pipe(struct file *);
- extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
- 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 *);
- static inline struct inode *iget(struct super_block *sb, unsigned long ino)
- {
- struct inode *inode = iget_locked(sb, ino);
-
- if (inode && (inode->i_state & I_NEW)) {
- sb->s_op->read_inode(inode);
- unlock_new_inode(inode);
- }
- return inode;
- }
- extern void __iget(struct inode * inode);
- extern void clear_inode(struct inode *);
- extern void destroy_inode(struct inode *);
- extern struct inode *new_inode(struct super_block *);
- extern int __remove_suid(struct dentry *, int);
- extern int should_remove_suid(struct dentry *);
- extern int remove_suid(struct dentry *);
- 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 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);
- extern int file_send_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 ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
- extern void do_generic_mapping_read(struct address_space *mapping,
- struct file_ra_state *, struct file *,
- loff_t *, read_descriptor_t *, read_actor_t);
- /* 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 remote_llseek(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 ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
- size_t count, read_actor_t actor,
- void *target);
- 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
- static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
- read_descriptor_t * desc,
- read_actor_t actor)
- {
- do_generic_mapping_read(filp->f_mapping,
- &filp->f_ra,
- filp,
- ppos,
- desc,
- actor);
- }
- #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,
- gfp_t gfp_mask);
- 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 vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
- 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_commit_write(struct file *file, struct page *page,
- unsigned offset, unsigned to);
- 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 *, size_t, loff_t *, const void *, size_t);
- #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);
- 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;
- }
- /* kernel/fork.c */
- extern int unshare_files(void);
- /* 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_close, \
- .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,
- u64 (*get)(void *), void (*set)(void *, u64),
- const char *fmt);
- int simple_attr_close(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 */
- #endif /* __KERNEL__ */
- #endif /* _LINUX_FS_H */
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