diff options
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 105 |
1 files changed, 74 insertions, 31 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 6c75193bf9a9..a6658043258a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -32,7 +32,9 @@ #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 +#define SEEK_DATA 3 /* seek to the next data */ +#define SEEK_HOLE 4 /* seek to the next hole */ +#define SEEK_MAX SEEK_HOLE struct fstrim_range { __u64 start; @@ -63,6 +65,7 @@ struct inodes_stat_t { #define MAY_ACCESS 16 #define MAY_OPEN 32 #define MAY_CHDIR 64 +#define MAY_NOT_BLOCK 128 /* called from RCU mode, don't block */ /* * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond @@ -391,8 +394,9 @@ struct inodes_stat_t { #include <linux/semaphore.h> #include <linux/fiemap.h> #include <linux/rculist_bl.h> +#include <linux/shrinker.h> +#include <linux/atomic.h> -#include <asm/atomic.h> #include <asm/byteorder.h> struct export_operations; @@ -776,7 +780,7 @@ struct inode { struct timespec i_ctime; blkcnt_t i_blocks; unsigned short i_bytes; - struct rw_semaphore i_alloc_sem; + atomic_t i_dio_count; const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ struct file_lock *i_flock; struct address_space *i_mapping; @@ -1395,6 +1399,11 @@ struct super_block { struct list_head s_dentry_lru; /* unused dentry lru */ int s_nr_dentry_unused; /* # of dentry on lru */ + /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */ + spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp; + struct list_head s_inode_lru; /* unused inode lru */ + int s_nr_inodes_unused; /* # of inodes on lru */ + struct block_device *s_bdev; struct backing_dev_info *s_bdi; struct mtd_info *s_mtd; @@ -1437,8 +1446,14 @@ struct super_block { * Saved pool identifier for cleancache (-1 means none) */ int cleancache_poolid; + + struct shrinker s_shrink; /* per-sb shrinker handle */ }; +/* superblock cache pruning functions */ +extern void prune_icache_sb(struct super_block *sb, int nr_to_scan); +extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan); + extern struct timespec current_fs_time(struct super_block *sb); /* @@ -1453,10 +1468,6 @@ enum { #define vfs_check_frozen(sb, level) \ wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) -#define get_fs_excl() atomic_inc(¤t->fs_excl) -#define put_fs_excl() atomic_dec(¤t->fs_excl) -#define has_fs_excl() atomic_read(¤t->fs_excl) - /* * until VFS tracks user namespaces for inodes, just make all files * belong to init_user_ns @@ -1489,7 +1500,6 @@ extern void dentry_unhash(struct dentry *dentry); /* * VFS file helper functions. */ -extern int file_permission(struct file *, int); extern void inode_init_owner(struct inode *inode, const struct inode *dir, mode_t mode); /* @@ -1537,11 +1547,6 @@ struct block_device_operations; #define HAVE_COMPAT_IOCTL 1 #define HAVE_UNLOCKED_IOCTL 1 -/* - * NOTE: - * all file operations except setlease can be called without - * the big kernel lock held in all filesystems. - */ struct file_operations { struct module *owner; loff_t (*llseek) (struct file *, loff_t, int); @@ -1557,7 +1562,7 @@ struct file_operations { int (*open) (struct inode *, struct file *); int (*flush) (struct file *, fl_owner_t id); int (*release) (struct inode *, struct file *); - int (*fsync) (struct file *, int datasync); + int (*fsync) (struct file *, loff_t, loff_t, int datasync); int (*aio_fsync) (struct kiocb *, int datasync); int (*fasync) (int, struct file *, int); int (*lock) (struct file *, int, struct file_lock *); @@ -1572,13 +1577,11 @@ struct file_operations { loff_t len); }; -#define IPERM_FLAG_RCU 0x0001 - struct inode_operations { struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); void * (*follow_link) (struct dentry *, struct nameidata *); - int (*permission) (struct inode *, int, unsigned int); - int (*check_acl)(struct inode *, int, unsigned int); + int (*permission) (struct inode *, int); + struct posix_acl * (*get_acl)(struct inode *, int); int (*readlink) (struct dentry *, char __user *,int); void (*put_link) (struct dentry *, struct nameidata *, void *); @@ -1644,6 +1647,8 @@ struct super_operations { ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); #endif int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); + int (*nr_cached_objects)(struct super_block *); + void (*free_cached_objects)(struct super_block *, int); }; /* @@ -1692,6 +1697,10 @@ struct super_operations { * set during data writeback, and cleared with a wakeup * on the bit address once it is done. * + * I_REFERENCED Marks the inode as recently references on the LRU list. + * + * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). + * * Q: What is the difference between I_WILL_FREE and I_FREEING? */ #define I_DIRTY_SYNC (1 << 0) @@ -1705,6 +1714,8 @@ struct super_operations { #define __I_SYNC 7 #define I_SYNC (1 << __I_SYNC) #define I_REFERENCED (1 << 8) +#define __I_DIO_WAKEUP 9 +#define I_DIO_WAKEUP (1 << I_DIO_WAKEUP) #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) @@ -1815,7 +1826,6 @@ struct file_system_type { struct lock_class_key i_lock_key; struct lock_class_key i_mutex_key; struct lock_class_key i_mutex_dir_key; - struct lock_class_key i_alloc_sem_key; }; extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, @@ -1836,6 +1846,8 @@ void kill_litter_super(struct super_block *sb); void deactivate_super(struct super_block *sb); void deactivate_locked_super(struct super_block *sb); int set_anon_super(struct super_block *s, void *data); +int get_anon_bdev(dev_t *); +void free_anon_bdev(dev_t); struct super_block *sget(struct file_system_type *type, int (*test)(struct super_block *,void *), int (*set)(struct super_block *,void *), @@ -1868,6 +1880,7 @@ 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 void kern_unmount(struct vfsmount *mnt); extern int may_umount_tree(struct vfsmount *); extern int may_umount(struct vfsmount *); extern long do_mount(char *, char *, char *, unsigned long, void *); @@ -2187,16 +2200,38 @@ extern sector_t bmap(struct inode *, sector_t); #endif extern int notify_change(struct dentry *, struct iattr *); extern int inode_permission(struct inode *, int); -extern int generic_permission(struct inode *, int, unsigned int, - int (*check_acl)(struct inode *, int, unsigned int)); +extern int generic_permission(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 *); +/* + * get_write_access() gets write permission for a file. + * put_write_access() releases this write permission. + * This is used for regular files. + * We cannot support write (and maybe mmap read-write shared) accesses and + * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode + * can have the following values: + * 0: no writers, no VM_DENYWRITE mappings + * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist + * > 0: (i_writecount) users are writing to the file. + * + * Normally we operate on that counter with atomic_{inc,dec} and it's safe + * except for the cases where we don't hold i_writecount yet. Then we need to + * use {get,deny}_write_access() - these functions check the sign and refuse + * to do the change if sign is wrong. + */ +static inline int get_write_access(struct inode *inode) +{ + return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; +} +static inline int deny_write_access(struct file *file) +{ + struct inode *inode = file->f_path.dentry->d_inode; + return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; +} static inline void put_write_access(struct inode * inode) { atomic_dec(&inode->i_writecount); @@ -2316,7 +2351,8 @@ extern int generic_segment_checks(const struct iovec *iov, /* fs/block_dev.c */ extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos); -extern int blkdev_fsync(struct file *filp, int datasync); +extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, + int datasync); /* fs/splice.c */ extern ssize_t generic_file_splice_read(struct file *, loff_t *, @@ -2367,6 +2403,8 @@ enum { }; void dio_end_io(struct bio *bio, int error); +void inode_dio_wait(struct inode *inode); +void inode_dio_done(struct inode *inode); ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, struct block_device *bdev, const struct iovec *iov, loff_t offset, @@ -2374,14 +2412,17 @@ ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, dio_submit_t submit_io, int flags); static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, - struct inode *inode, struct block_device *bdev, const struct iovec *iov, - loff_t offset, unsigned long nr_segs, get_block_t get_block, - dio_iodone_t end_io) + struct inode *inode, const struct iovec *iov, loff_t offset, + unsigned long nr_segs, get_block_t get_block) { - return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, - nr_segs, get_block, end_io, NULL, + return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, + offset, nr_segs, get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); } +#else +static inline void inode_dio_wait(struct inode *inode) +{ +} #endif extern const struct file_operations generic_ro_fops; @@ -2431,6 +2472,8 @@ extern struct super_block *get_active_super(struct block_device *bdev); extern struct super_block *user_get_super(dev_t); extern void drop_super(struct super_block *sb); extern void iterate_supers(void (*)(struct super_block *, void *), void *); +extern void iterate_supers_type(struct file_system_type *, + void (*)(struct super_block *, void *), void *); extern int dcache_dir_open(struct inode *, struct file *); extern int dcache_dir_close(struct inode *, struct file *); @@ -2443,7 +2486,7 @@ extern int simple_link(struct dentry *, struct inode *, struct dentry *); extern int simple_unlink(struct inode *, struct dentry *); extern int simple_rmdir(struct inode *, struct dentry *); extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); -extern int noop_fsync(struct file *, int); +extern int noop_fsync(struct file *, loff_t, loff_t, int); extern int simple_empty(struct dentry *); extern int simple_readpage(struct file *file, struct page *page); extern int simple_write_begin(struct file *file, struct address_space *mapping, @@ -2468,7 +2511,7 @@ extern ssize_t simple_read_from_buffer(void __user *to, size_t count, extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, const void __user *from, size_t count); -extern int generic_file_fsync(struct file *, int); +extern int generic_file_fsync(struct file *, loff_t, loff_t, int); extern int generic_check_addressable(unsigned, u64); |