diff options
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 218 |
1 files changed, 170 insertions, 48 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index f4131e8ead74..cc008c338f5a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -35,10 +35,10 @@ #include <uapi/linux/fs.h> struct backing_dev_info; +struct bdi_writeback; struct export_operations; struct hd_geometry; struct iovec; -struct nameidata; struct kiocb; struct kobject; struct pipe_inode_info; @@ -70,6 +70,7 @@ 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); +typedef void (dax_iodone_t)(struct buffer_head *bh_map, int uptodate); #define MAY_EXEC 0x00000001 #define MAY_WRITE 0x00000002 @@ -314,6 +315,33 @@ struct page; struct address_space; struct writeback_control; +#define IOCB_EVENTFD (1 << 0) +#define IOCB_APPEND (1 << 1) +#define IOCB_DIRECT (1 << 2) + +struct kiocb { + struct file *ki_filp; + loff_t ki_pos; + void (*ki_complete)(struct kiocb *iocb, long ret, long ret2); + void *private; + int ki_flags; +}; + +static inline bool is_sync_kiocb(struct kiocb *kiocb) +{ + return kiocb->ki_complete == NULL; +} + +static inline int iocb_flags(struct file *file); + +static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) +{ + *kiocb = (struct kiocb) { + .ki_filp = filp, + .ki_flags = iocb_flags(filp), + }; +} + /* * "descriptor" for what we're up to with a read. * This allows us to use the same read code yet @@ -361,7 +389,7 @@ struct address_space_operations { void (*invalidatepage) (struct page *, unsigned int, unsigned int); int (*releasepage) (struct page *, gfp_t); void (*freepage)(struct page *); - ssize_t (*direct_IO)(int, struct kiocb *, struct iov_iter *iter, loff_t offset); + ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter, loff_t offset); /* * migrate the contents of a page to the specified target. If * migrate_mode is MIGRATE_ASYNC, it must not block. @@ -608,6 +636,14 @@ struct inode { struct hlist_node i_hash; struct list_head i_wb_list; /* backing dev IO list */ +#ifdef CONFIG_CGROUP_WRITEBACK + struct bdi_writeback *i_wb; /* the associated cgroup wb */ + + /* foreign inode detection, see wbc_detach_inode() */ + int i_wb_frn_winner; + u16 i_wb_frn_avg_time; + u16 i_wb_frn_history; +#endif struct list_head i_lru; /* inode LRU list */ struct list_head i_sb_list; union { @@ -629,6 +665,7 @@ struct inode { struct pipe_inode_info *i_pipe; struct block_device *i_bdev; struct cdev *i_cdev; + char *i_link; }; __u32 i_generation; @@ -848,6 +885,7 @@ static inline struct file *get_file(struct file *f) atomic_long_inc(&f->f_count); return f; } +#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) #define file_count(x) atomic_long_read(&(x)->f_count) @@ -893,8 +931,8 @@ struct file_lock_operations { struct lock_manager_operations { int (*lm_compare_owner)(struct file_lock *, struct file_lock *); unsigned long (*lm_owner_key)(struct file_lock *); - void (*lm_get_owner)(struct file_lock *, struct file_lock *); - void (*lm_put_owner)(struct file_lock *); + fl_owner_t (*lm_get_owner)(fl_owner_t); + void (*lm_put_owner)(fl_owner_t); void (*lm_notify)(struct file_lock *); /* unblock callback */ int (*lm_grant)(struct file_lock *, int); bool (*lm_break)(struct file_lock *); @@ -1008,17 +1046,20 @@ extern void locks_remove_file(struct file *); extern void locks_release_private(struct file_lock *); extern void posix_test_lock(struct file *, struct file_lock *); extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); -extern int posix_lock_file_wait(struct file *, struct file_lock *); +extern int posix_lock_inode_wait(struct inode *, struct file_lock *); extern int posix_unblock_lock(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 flock_lock_inode_wait(struct inode *inode, struct file_lock *fl); extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); extern void lease_get_mtime(struct inode *, struct timespec *time); extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); extern int vfs_setlease(struct file *, long, struct file_lock **, void **); extern int lease_modify(struct file_lock *, int, struct list_head *); +struct files_struct; +extern void show_fd_locks(struct seq_file *f, + struct file *filp, struct files_struct *files); #else /* !CONFIG_FILE_LOCKING */ static inline int fcntl_getlk(struct file *file, unsigned int cmd, struct flock __user *user) @@ -1096,7 +1137,8 @@ static inline int posix_lock_file(struct file *filp, struct file_lock *fl, return -ENOLCK; } -static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) +static inline int posix_lock_inode_wait(struct inode *inode, + struct file_lock *fl) { return -ENOLCK; } @@ -1122,8 +1164,8 @@ static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) return 0; } -static inline int flock_lock_file_wait(struct file *filp, - struct file_lock *request) +static inline int flock_lock_inode_wait(struct inode *inode, + struct file_lock *request) { return -ENOLCK; } @@ -1155,8 +1197,26 @@ static inline int lease_modify(struct file_lock *fl, int arg, { return -EINVAL; } + +struct files_struct; +static inline void show_fd_locks(struct seq_file *f, + struct file *filp, struct files_struct *files) {} #endif /* !CONFIG_FILE_LOCKING */ +static inline struct inode *file_inode(const struct file *f) +{ + return f->f_inode; +} + +static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) +{ + return posix_lock_inode_wait(file_inode(filp), fl); +} + +static inline int flock_lock_file_wait(struct file *filp, struct file_lock *fl) +{ + return flock_lock_inode_wait(file_inode(filp), fl); +} struct fasync_struct { spinlock_t fa_lock; @@ -1197,6 +1257,8 @@ struct mm_struct; #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ +/* sb->s_iflags */ +#define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ /* Possible states of 'frozen' field */ enum { @@ -1235,6 +1297,7 @@ struct super_block { const struct quotactl_ops *s_qcop; const struct export_operations *s_export_op; unsigned long s_flags; + unsigned long s_iflags; /* internal SB_I_* flags */ unsigned long s_magic; struct dentry *s_root; struct rw_semaphore s_umount; @@ -1540,8 +1603,6 @@ struct file_operations { 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); ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); int (*iterate) (struct file *, struct dir_context *); @@ -1549,7 +1610,7 @@ struct file_operations { 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 *); - void (*mremap)(struct file *, struct vm_area_struct *); + int (*mremap)(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 *); @@ -1574,12 +1635,12 @@ struct file_operations { struct inode_operations { struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); - void * (*follow_link) (struct dentry *, struct nameidata *); + const char * (*follow_link) (struct dentry *, void **); 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 *); + void (*put_link) (struct inode *, void *); int (*create) (struct inode *,struct dentry *, umode_t, bool); int (*link) (struct dentry *,struct inode *,struct dentry *); @@ -1608,7 +1669,6 @@ struct inode_operations { int (*set_acl)(struct inode *, struct posix_acl *, int); /* WARNING: probably going away soon, do not use! */ - int (*dentry_open)(struct dentry *, struct file *, const struct cred *); } ____cacheline_aligned; ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, @@ -1617,6 +1677,7 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, 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_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 *, @@ -1772,6 +1833,11 @@ struct super_operations { * * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). * + * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to + * synchronize competing switching instances and to tell + * wb stat updates to grab mapping->tree_lock. See + * inode_switch_wb_work_fn() for details. + * * Q: What is the difference between I_WILL_FREE and I_FREEING? */ #define I_DIRTY_SYNC (1 << 0) @@ -1786,11 +1852,12 @@ struct super_operations { #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_DIO_WAKEUP (1 << __I_DIO_WAKEUP) #define I_LINKABLE (1 << 10) #define I_DIRTY_TIME (1 << 11) #define __I_DIRTY_TIME_EXPIRED 12 #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) +#define I_WB_SWITCH (1 << 13) #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) @@ -1845,6 +1912,7 @@ enum file_time_flags { S_VERSION = 8, }; +extern bool atime_needs_update(const struct path *, struct inode *); extern void touch_atime(const struct path *); static inline void file_accessed(struct file *file) { @@ -1863,6 +1931,7 @@ struct file_system_type { #define FS_HAS_SUBTYPE 4 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */ +#define FS_USERNS_VISIBLE 32 /* FS must already be visible */ #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ struct dentry *(*mount) (struct file_system_type *, int, const char *, void *); @@ -1950,7 +2019,6 @@ extern int vfs_ustat(dev_t, struct kstatfs *); extern int freeze_super(struct super_block *super); extern int thaw_super(struct super_block *super); extern bool our_mnt(struct vfsmount *mnt); -extern bool fs_fully_visible(struct file_system_type *); extern int current_umask(void); @@ -1958,11 +2026,6 @@ extern void ihold(struct inode * inode); extern void iput(struct inode *); extern int generic_update_time(struct inode *, struct timespec *, int); -static inline struct inode *file_inode(const struct file *f) -{ - return f->f_inode; -} - /* /sys/fs */ extern struct kobject *fs_kobj; @@ -2145,7 +2208,7 @@ struct filename { const __user char *uptr; /* original userland pointer */ struct audit_names *aname; int refcnt; - bool separate; /* should "name" be freed? */ + const char iname[]; }; extern long vfs_truncate(struct path *, loff_t); @@ -2159,7 +2222,6 @@ extern struct file *file_open_name(struct filename *, int, umode_t); extern struct file *filp_open(const char *, int, umode_t); extern struct file *file_open_root(struct dentry *, struct vfsmount *, const char *, int); -extern int vfs_open(const struct path *, struct file *, const struct cred *); extern struct file * dentry_open(const struct path *, int, const struct cred *); extern int filp_close(struct file *, fl_owner_t id); @@ -2206,7 +2268,13 @@ extern struct super_block *freeze_bdev(struct block_device *); extern void emergency_thaw_all(void); extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); extern int fsync_bdev(struct block_device *); -extern int sb_is_blkdev_sb(struct super_block *sb); + +extern struct super_block *blockdev_superblock; + +static inline bool sb_is_blkdev_sb(struct super_block *sb) +{ + return sb == blockdev_superblock; +} #else static inline void bd_forget(struct inode *inode) {} static inline int sync_blockdev(struct block_device *bdev) { return 0; } @@ -2245,6 +2313,9 @@ extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); extern void blkdev_put(struct block_device *bdev, fmode_t mode); +extern int __blkdev_reread_part(struct block_device *bdev); +extern int blkdev_reread_part(struct block_device *bdev); + #ifdef CONFIG_SYSFS extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); extern void bd_unlink_disk_holder(struct block_device *bdev, @@ -2467,6 +2538,8 @@ extern struct file * open_exec(const char *); extern int is_subdir(struct dentry *, struct dentry *); extern int path_is_under(struct path *, struct path *); +extern char *file_path(struct file *, char *, int); + #include <linux/err.h> /* needed for stackable file system support */ @@ -2518,7 +2591,12 @@ extern struct inode *new_inode_pseudo(struct super_block *sb); extern struct inode *new_inode(struct super_block *sb); extern void free_inode_nonrcu(struct inode *inode); extern int should_remove_suid(struct dentry *); -extern int file_remove_suid(struct file *); +extern int file_remove_privs(struct file *); +extern int dentry_needs_remove_privs(struct dentry *dentry); +static inline int file_needs_remove_privs(struct file *file) +{ + return dentry_needs_remove_privs(file->f_path.dentry); +} extern void __insert_inode_hash(struct inode *, unsigned long hashval); static inline void insert_inode_hash(struct inode *inode) @@ -2545,16 +2623,12 @@ 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 *); -int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); +extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *, loff_t); extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_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 new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); -extern ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos); ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos); @@ -2592,13 +2666,18 @@ extern loff_t fixed_size_llseek(struct file *file, loff_t offset, extern int generic_file_open(struct inode * inode, struct file * filp); extern int nonseekable_open(struct inode * inode, struct file * filp); -ssize_t dax_do_io(int rw, struct kiocb *, struct inode *, struct iov_iter *, - loff_t, get_block_t, dio_iodone_t, int flags); +ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, loff_t, + get_block_t, dio_iodone_t, int flags); int dax_clear_blocks(struct inode *, sector_t block, long size); int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t); int dax_truncate_page(struct inode *, loff_t from, get_block_t); -int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t); -#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb) +int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t, + dax_iodone_t); +int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t, + dax_iodone_t); +int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *); +#define dax_mkwrite(vma, vmf, gb, iod) dax_fault(vma, vmf, gb, iod) +#define __dax_mkwrite(vma, vmf, gb, iod) __dax_fault(vma, vmf, gb, iod) #ifdef CONFIG_BLOCK typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, @@ -2613,27 +2692,56 @@ enum { /* filesystem can handle aio writes beyond i_size */ DIO_ASYNC_EXTEND = 0x04, + + /* inode/fs/bdev does not need truncate protection */ + DIO_SKIP_DIO_COUNT = 0x08, }; void dio_end_io(struct bio *bio, int error); -ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, - struct block_device *bdev, struct iov_iter *iter, loff_t offset, - get_block_t get_block, dio_iodone_t end_io, - dio_submit_t submit_io, int flags); +ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, + struct block_device *bdev, struct iov_iter *iter, + loff_t offset, get_block_t get_block, + dio_iodone_t end_io, dio_submit_t submit_io, + int flags); -static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, - struct inode *inode, struct iov_iter *iter, loff_t offset, - get_block_t get_block) +static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, + struct inode *inode, + struct iov_iter *iter, loff_t offset, + get_block_t get_block) { - return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iter, + return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, offset, get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); } #endif void inode_dio_wait(struct inode *inode); -void inode_dio_done(struct inode *inode); + +/* + * inode_dio_begin - signal start of a direct I/O requests + * @inode: inode the direct I/O happens on + * + * This is called once we've finished processing a direct I/O request, + * and is used to wake up callers waiting for direct I/O to be quiesced. + */ +static inline void inode_dio_begin(struct inode *inode) +{ + atomic_inc(&inode->i_dio_count); +} + +/* + * inode_dio_end - signal finish of a direct I/O requests + * @inode: inode the direct I/O happens on + * + * This is called once we've finished processing a direct I/O request, + * and is used to wake up callers waiting for direct I/O to be quiesced. + */ +static inline void inode_dio_end(struct inode *inode) +{ + if (atomic_dec_and_test(&inode->i_dio_count)) + wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); +} extern void inode_set_flags(struct inode *inode, unsigned int flags, unsigned int mask); @@ -2644,13 +2752,14 @@ extern const struct file_operations generic_ro_fops; extern int readlink_copy(char __user *, int, 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 const char *page_follow_link_light(struct dentry *, void **); +extern void page_put_link(struct inode *, 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 void kfree_put_link(struct dentry *, struct nameidata *, void *); +extern void kfree_put_link(struct inode *, void *); +extern void free_page_put_link(struct inode *, void *); extern int generic_readlink(struct dentry *, char __user *, int); extern void generic_fillattr(struct inode *, struct kstat *); int vfs_getattr_nosec(struct path *path, struct kstat *stat); @@ -2661,8 +2770,9 @@ void __inode_sub_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); +const char *simple_follow_link(struct dentry *, void **); +extern const struct inode_operations simple_symlink_inode_operations; -extern int vfs_readdir(struct file *, filldir_t, void *); extern int iterate_dir(struct file *, struct dir_context *); extern int vfs_stat(const char __user *, struct kstat *); @@ -2721,6 +2831,8 @@ extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned in 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; +extern void make_empty_dir_inode(struct inode *inode); +extern bool is_empty_dir_inode(struct inode *inode); struct tree_descr { char *name; const struct file_operations *ops; int mode; }; struct dentry *d_alloc_name(struct dentry *, const char *); extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); @@ -2760,6 +2872,16 @@ static inline bool io_is_direct(struct file *filp) return (filp->f_flags & O_DIRECT) || IS_DAX(file_inode(filp)); } +static inline int iocb_flags(struct file *file) +{ + int res = 0; + if (file->f_flags & O_APPEND) + res |= IOCB_APPEND; + if (io_is_direct(file)) + res |= IOCB_DIRECT; + return res; +} + static inline ino_t parent_ino(struct dentry *dentry) { ino_t res; |