| #ifndef _LINUX_FS_H |
| #define _LINUX_FS_H |
| |
| #include <linux/linkage.h> |
| #include <linux/wait.h> |
| #include <linux/kdev_t.h> |
| #include <linux/dcache.h> |
| #include <linux/path.h> |
| #include <linux/stat.h> |
| #include <linux/cache.h> |
| #include <linux/list.h> |
| #include <linux/list_lru.h> |
| #include <linux/llist.h> |
| #include <linux/radix-tree.h> |
| #include <linux/rbtree.h> |
| #include <linux/init.h> |
| #include <linux/pid.h> |
| #include <linux/bug.h> |
| #include <linux/mutex.h> |
| #include <linux/rwsem.h> |
| #include <linux/capability.h> |
| #include <linux/semaphore.h> |
| #include <linux/fiemap.h> |
| #include <linux/rculist_bl.h> |
| #include <linux/atomic.h> |
| #include <linux/shrinker.h> |
| #include <linux/migrate_mode.h> |
| #include <linux/uidgid.h> |
| #include <linux/lockdep.h> |
| #include <linux/percpu-rwsem.h> |
| #include <linux/blk_types.h> |
| #include <linux/workqueue.h> |
| #include <linux/percpu-rwsem.h> |
| |
| #include <asm/byteorder.h> |
| #include <uapi/linux/fs.h> |
| |
| struct backing_dev_info; |
| struct bdi_writeback; |
| struct export_operations; |
| struct hd_geometry; |
| struct iovec; |
| struct kiocb; |
| struct kobject; |
| struct pipe_inode_info; |
| struct poll_table_struct; |
| struct kstatfs; |
| struct vm_area_struct; |
| struct vfsmount; |
| struct cred; |
| struct swap_info_struct; |
| struct seq_file; |
| struct workqueue_struct; |
| struct iov_iter; |
| |
| extern void __init inode_init(void); |
| extern void __init inode_init_early(void); |
| extern void __init files_init(void); |
| extern void __init files_maxfiles_init(void); |
| |
| extern struct files_stat_struct files_stat; |
| extern unsigned long get_max_files(void); |
| extern int sysctl_nr_open; |
| extern struct inodes_stat_t inodes_stat; |
| extern int leases_enable, lease_break_time; |
| extern int sysctl_protected_symlinks; |
| extern int sysctl_protected_hardlinks; |
| |
| 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); |
| typedef void (dax_iodone_t)(struct buffer_head *bh_map, int uptodate); |
| |
| #define MAY_EXEC 0x00000001 |
| #define MAY_WRITE 0x00000002 |
| #define MAY_READ 0x00000004 |
| #define MAY_APPEND 0x00000008 |
| #define MAY_ACCESS 0x00000010 |
| #define MAY_OPEN 0x00000020 |
| #define MAY_CHDIR 0x00000040 |
| /* called from RCU mode, don't block */ |
| #define MAY_NOT_BLOCK 0x00000080 |
| |
| /* |
| * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
| * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
| */ |
| |
| /* file is open for reading */ |
| #define FMODE_READ ((__force fmode_t)0x1) |
| /* file is open for writing */ |
| #define FMODE_WRITE ((__force fmode_t)0x2) |
| /* file is seekable */ |
| #define FMODE_LSEEK ((__force fmode_t)0x4) |
| /* file can be accessed using pread */ |
| #define FMODE_PREAD ((__force fmode_t)0x8) |
| /* file can be accessed using pwrite */ |
| #define FMODE_PWRITE ((__force fmode_t)0x10) |
| /* File is opened for execution with sys_execve / sys_uselib */ |
| #define FMODE_EXEC ((__force fmode_t)0x20) |
| /* File is opened with O_NDELAY (only set for block devices) */ |
| #define FMODE_NDELAY ((__force fmode_t)0x40) |
| /* File is opened with O_EXCL (only set for block devices) */ |
| #define FMODE_EXCL ((__force fmode_t)0x80) |
| /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
| (specialy hack for floppy.c) */ |
| #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
| /* 32bit hashes as llseek() offset (for directories) */ |
| #define FMODE_32BITHASH ((__force fmode_t)0x200) |
| /* 64bit hashes as llseek() offset (for directories) */ |
| #define FMODE_64BITHASH ((__force fmode_t)0x400) |
| |
| /* |
| * Don't update ctime and mtime. |
| * |
| * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
| * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
| */ |
| #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
| |
| /* Expect random access pattern */ |
| #define FMODE_RANDOM ((__force fmode_t)0x1000) |
| |
| /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
| #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) |
| |
| /* File is opened with O_PATH; almost nothing can be done with it */ |
| #define FMODE_PATH ((__force fmode_t)0x4000) |
| |
| /* File needs atomic accesses to f_pos */ |
| #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) |
| /* Write access to underlying fs */ |
| #define FMODE_WRITER ((__force fmode_t)0x10000) |
| /* Has read method(s) */ |
| #define FMODE_CAN_READ ((__force fmode_t)0x20000) |
| /* Has write method(s) */ |
| #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) |
| |
| /* File was opened by fanotify and shouldn't generate fanotify events */ |
| #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) |
| |
| /* |
| * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector |
| * that indicates that they should check the contents of the iovec are |
| * valid, but not check the memory that the iovec elements |
| * points too. |
| */ |
| #define CHECK_IOVEC_ONLY -1 |
| |
| /* |
| * The below are the various read and write types that we support. Some of |
| * them include behavioral modifiers that send information down to the |
| * block layer and IO scheduler. Terminology: |
| * |
| * The block layer uses device plugging to defer IO a little bit, in |
| * the hope that we will see more IO very shortly. This increases |
| * coalescing of adjacent IO and thus reduces the number of IOs we |
| * have to send to the device. It also allows for better queuing, |
| * if the IO isn't mergeable. If the caller is going to be waiting |
| * for the IO, then he must ensure that the device is unplugged so |
| * that the IO is dispatched to the driver. |
| * |
| * All IO is handled async in Linux. This is fine for background |
| * writes, but for reads or writes that someone waits for completion |
| * on, we want to notify the block layer and IO scheduler so that they |
| * know about it. That allows them to make better scheduling |
| * decisions. So when the below references 'sync' and 'async', it |
| * is referencing this priority hint. |
| * |
| * With that in mind, the available types are: |
| * |
| * READ A normal read operation. Device will be plugged. |
| * READ_SYNC A synchronous read. Device is not plugged, caller can |
| * immediately wait on this read without caring about |
| * unplugging. |
| * READA Used for read-ahead operations. Lower priority, and the |
| * block layer could (in theory) choose to ignore this |
| * request if it runs into resource problems. |
| * WRITE A normal async write. Device will be plugged. |
| * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
| * the hint that someone will be waiting on this IO |
| * shortly. The write equivalent of READ_SYNC. |
| * WRITE_ODIRECT Special case write for O_DIRECT only. |
| * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
| * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on |
| * non-volatile media on completion. |
| * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded |
| * by a cache flush and data is guaranteed to be on |
| * non-volatile media on completion. |
| * |
| */ |
| #define RW_MASK REQ_WRITE |
| #define RWA_MASK REQ_RAHEAD |
| |
| #define READ 0 |
| #define WRITE RW_MASK |
| #define READA RWA_MASK |
| |
| #define READ_SYNC (READ | REQ_SYNC) |
| #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
| #define WRITE_ODIRECT (WRITE | REQ_SYNC) |
| #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
| #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) |
| #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) |
| |
| /* |
| * Attribute flags. These should be or-ed together to figure out what |
| * has been changed! |
| */ |
| #define ATTR_MODE (1 << 0) |
| #define ATTR_UID (1 << 1) |
| #define ATTR_GID (1 << 2) |
| #define ATTR_SIZE (1 << 3) |
| #define ATTR_ATIME (1 << 4) |
| #define ATTR_MTIME (1 << 5) |
| #define ATTR_CTIME (1 << 6) |
| #define ATTR_ATIME_SET (1 << 7) |
| #define ATTR_MTIME_SET (1 << 8) |
| #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
| #define ATTR_ATTR_FLAG (1 << 10) |
| #define ATTR_KILL_SUID (1 << 11) |
| #define ATTR_KILL_SGID (1 << 12) |
| #define ATTR_FILE (1 << 13) |
| #define ATTR_KILL_PRIV (1 << 14) |
| #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
| #define ATTR_TIMES_SET (1 << 16) |
| |
| /* |
| * Whiteout is represented by a char device. The following constants define the |
| * mode and device number to use. |
| */ |
| #define WHITEOUT_MODE 0 |
| #define WHITEOUT_DEV 0 |
| |
| /* |
| * 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; |
| kuid_t ia_uid; |
| kgid_t ia_gid; |
| loff_t ia_size; |
| struct timespec ia_atime; |
| struct timespec ia_mtime; |
| struct timespec ia_ctime; |
| |
| /* |
| * Not an attribute, but an auxiliary 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> |
| |
| /* |
| * Maximum number of layers of fs stack. Needs to be limited to |
| * prevent kernel stack overflow |
| */ |
| #define FILESYSTEM_MAX_STACK_DEPTH 2 |
| |
| /** |
| * enum positive_aop_returns - aop return codes with specific semantics |
| * |
| * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
| * completed, that the page is still locked, and |
| * should be considered active. The VM uses this hint |
| * to return the page to the active list -- it won't |
| * be a candidate for writeback again in the near |
| * future. Other callers must be careful to unlock |
| * the page if they get this return. Returned by |
| * writepage(); |
| * |
| * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
| * unlocked it and the page might have been truncated. |
| * The caller should back up to acquiring a new page and |
| * trying again. The aop will be taking reasonable |
| * precautions not to livelock. If the caller held a page |
| * reference, it should drop it before retrying. Returned |
| * by readpage(). |
| * |
| * address_space_operation functions return these large constants to indicate |
| * special semantics to the caller. These are much larger than the bytes in a |
| * page to allow for functions that return the number of bytes operated on in a |
| * given page. |
| */ |
| |
| enum positive_aop_returns { |
| AOP_WRITEPAGE_ACTIVATE = 0x80000, |
| AOP_TRUNCATED_PAGE = 0x80001, |
| }; |
| |
| #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
| #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
| #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
| * helper code (eg buffer layer) |
| * to clear GFP_FS from alloc */ |
| |
| /* |
| * oh the beauties of C type declarations. |
| */ |
| struct page; |
| struct address_space; |
| struct writeback_control; |
| |
| #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 |
| * have multiple different users of the data that |
| * we read from a file. |
| * |
| * The simplest case just copies the data to user |
| * mode. |
| */ |
| typedef struct { |
| size_t written; |
| size_t count; |
| union { |
| char __user *buf; |
| void *data; |
| } arg; |
| int error; |
| } read_descriptor_t; |
| |
| typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
| unsigned long, unsigned long); |
| |
| struct address_space_operations { |
| int (*writepage)(struct page *page, struct writeback_control *wbc); |
| int (*readpage)(struct file *, struct page *); |
| |
| /* Write back some dirty pages from this mapping. */ |
| int (*writepages)(struct address_space *, struct writeback_control *); |
| |
| /* Set a page dirty. Return true if this dirtied it */ |
| int (*set_page_dirty)(struct page *page); |
| |
| int (*readpages)(struct file *filp, struct address_space *mapping, |
| struct list_head *pages, unsigned nr_pages); |
| |
| int (*write_begin)(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata); |
| int (*write_end)(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata); |
| |
| /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
| sector_t (*bmap)(struct address_space *, sector_t); |
| void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
| int (*releasepage) (struct page *, gfp_t); |
| void (*freepage)(struct page *); |
| 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. |
| */ |
| int (*migratepage) (struct address_space *, |
| struct page *, struct page *, enum migrate_mode); |
| int (*launder_page) (struct page *); |
| int (*is_partially_uptodate) (struct page *, unsigned long, |
| unsigned long); |
| void (*is_dirty_writeback) (struct page *, bool *, bool *); |
| int (*error_remove_page)(struct address_space *, struct page *); |
| |
| /* swapfile support */ |
| int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
| sector_t *span); |
| void (*swap_deactivate)(struct file *file); |
| }; |
| |
| extern const struct address_space_operations empty_aops; |
| |
| /* |
| * pagecache_write_begin/pagecache_write_end must be used by general code |
| * to write into the pagecache. |
| */ |
| int pagecache_write_begin(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata); |
| |
| int pagecache_write_end(struct file *, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata); |
| |
| struct address_space { |
| struct inode *host; /* owner: inode, block_device */ |
| struct radix_tree_root page_tree; /* radix tree of all pages */ |
| spinlock_t tree_lock; /* and lock protecting it */ |
| atomic_t i_mmap_writable;/* count VM_SHARED mappings */ |
| struct rb_root i_mmap; /* tree of private and shared mappings */ |
| struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */ |
| /* Protected by tree_lock together with the radix tree */ |
| unsigned long nrpages; /* number of total pages */ |
| unsigned long nrshadows; /* number of shadow entries */ |
| pgoff_t writeback_index;/* writeback starts here */ |
| const struct address_space_operations *a_ops; /* methods */ |
| unsigned long flags; /* error bits/gfp mask */ |
| spinlock_t private_lock; /* for use by the address_space */ |
| struct list_head private_list; /* ditto */ |
| void *private_data; /* 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 significant bit |
| * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
| */ |
| struct request_queue; |
| |
| struct block_device { |
| dev_t bd_dev; /* not a kdev_t - it's a search key */ |
| int bd_openers; |
| struct inode * bd_inode; /* will die */ |
| struct super_block * bd_super; |
| struct mutex bd_mutex; /* open/close mutex */ |
| struct list_head bd_inodes; |
| void * bd_claiming; |
| void * bd_holder; |
| int bd_holders; |
| bool bd_write_holder; |
| #ifdef CONFIG_SYSFS |
| struct list_head bd_holder_disks; |
| #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 request_queue * bd_queue; |
| struct list_head bd_list; |
| /* |
| * Private data. You must have bd_claim'ed the block_device |
| * to use this. NOTE: bd_claim allows an owner to claim |
| * the same device multiple times, the owner must take special |
| * care to not mess up bd_private for that case. |
| */ |
| unsigned long bd_private; |
| |
| /* The counter of freeze processes */ |
| int bd_fsfreeze_count; |
| /* Mutex for freeze */ |
| struct mutex bd_fsfreeze_mutex; |
| }; |
| |
| /* |
| * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
| * radix trees |
| */ |
| #define PAGECACHE_TAG_DIRTY 0 |
| #define PAGECACHE_TAG_WRITEBACK 1 |
| #define PAGECACHE_TAG_TOWRITE 2 |
| |
| int mapping_tagged(struct address_space *mapping, int tag); |
| |
| static inline void i_mmap_lock_write(struct address_space *mapping) |
| { |
| down_write(&mapping->i_mmap_rwsem); |
| } |
| |
| static inline void i_mmap_unlock_write(struct address_space *mapping) |
| { |
| up_write(&mapping->i_mmap_rwsem); |
| } |
| |
| static inline void i_mmap_lock_read(struct address_space *mapping) |
| { |
| down_read(&mapping->i_mmap_rwsem); |
| } |
| |
| static inline void i_mmap_unlock_read(struct address_space *mapping) |
| { |
| up_read(&mapping->i_mmap_rwsem); |
| } |
| |
| /* |
| * Might pages of this file be mapped into userspace? |
| */ |
| static inline int mapping_mapped(struct address_space *mapping) |
| { |
| return !RB_EMPTY_ROOT(&mapping->i_mmap); |
| } |
| |
| /* |
| * 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. |
| * |
| * If i_mmap_writable is negative, no new writable mappings are allowed. You |
| * can only deny writable mappings, if none exists right now. |
| */ |
| static inline int mapping_writably_mapped(struct address_space *mapping) |
| { |
| return atomic_read(&mapping->i_mmap_writable) > 0; |
| } |
| |
| static inline int mapping_map_writable(struct address_space *mapping) |
| { |
| return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? |
| 0 : -EPERM; |
| } |
| |
| static inline void mapping_unmap_writable(struct address_space *mapping) |
| { |
| atomic_dec(&mapping->i_mmap_writable); |
| } |
| |
| static inline int mapping_deny_writable(struct address_space *mapping) |
| { |
| return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? |
| 0 : -EBUSY; |
| } |
| |
| static inline void mapping_allow_writable(struct address_space *mapping) |
| { |
| atomic_inc(&mapping->i_mmap_writable); |
| } |
| |
| /* |
| * Use sequence counter to get consistent i_size on 32-bit processors. |
| */ |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| #include <linux/seqlock.h> |
| #define __NEED_I_SIZE_ORDERED |
| #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
| #else |
| #define i_size_ordered_init(inode) do { } while (0) |
| #endif |
| |
| struct posix_acl; |
| #define ACL_NOT_CACHED ((void *)(-1)) |
| |
| #define IOP_FASTPERM 0x0001 |
| #define IOP_LOOKUP 0x0002 |
| #define IOP_NOFOLLOW 0x0004 |
| |
| /* |
| * Keep mostly read-only and often accessed (especially for |
| * the RCU path lookup and 'stat' data) fields at the beginning |
| * of the 'struct inode' |
| */ |
| struct inode { |
| umode_t i_mode; |
| unsigned short i_opflags; |
| kuid_t i_uid; |
| kgid_t i_gid; |
| unsigned int i_flags; |
| |
| #ifdef CONFIG_FS_POSIX_ACL |
| struct posix_acl *i_acl; |
| struct posix_acl *i_default_acl; |
| #endif |
| |
| const struct inode_operations *i_op; |
| struct super_block *i_sb; |
| struct address_space *i_mapping; |
| |
| #ifdef CONFIG_SECURITY |
| void *i_security; |
| #endif |
| |
| /* Stat data, not accessed from path walking */ |
| unsigned long i_ino; |
| /* |
| * Filesystems may only read i_nlink directly. They shall use the |
| * following functions for modification: |
| * |
| * (set|clear|inc|drop)_nlink |
| * inode_(inc|dec)_link_count |
| */ |
| union { |
| const unsigned int i_nlink; |
| unsigned int __i_nlink; |
| }; |
| dev_t i_rdev; |
| loff_t i_size; |
| struct timespec i_atime; |
| struct timespec i_mtime; |
| struct timespec i_ctime; |
| spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
| unsigned short i_bytes; |
| unsigned int i_blkbits; |
| blkcnt_t i_blocks; |
| |
| #ifdef __NEED_I_SIZE_ORDERED |
| seqcount_t i_size_seqcount; |
| #endif |
| |
| /* Misc */ |
| unsigned long i_state; |
| struct mutex i_mutex; |
| |
| unsigned long dirtied_when; /* jiffies of first dirtying */ |
| unsigned long dirtied_time_when; |
| |
| struct hlist_node i_hash; |
| struct list_head i_io_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 { |
| struct hlist_head i_dentry; |
| struct rcu_head i_rcu; |
| }; |
| u64 i_version; |
| atomic_t i_count; |
| atomic_t i_dio_count; |
| atomic_t i_writecount; |
| #ifdef CONFIG_IMA |
| atomic_t i_readcount; /* struct files open RO */ |
| #endif |
| const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
| struct file_lock_context *i_flctx; |
| struct address_space i_data; |
| struct list_head i_devices; |
| union { |
| struct pipe_inode_info *i_pipe; |
| struct block_device *i_bdev; |
| struct cdev *i_cdev; |
| char *i_link; |
| }; |
| |
| __u32 i_generation; |
| |
| #ifdef CONFIG_FSNOTIFY |
| __u32 i_fsnotify_mask; /* all events this inode cares about */ |
| struct hlist_head i_fsnotify_marks; |
| #endif |
| |
| void *i_private; /* fs or device private pointer */ |
| }; |
| |
| static inline int inode_unhashed(struct inode *inode) |
| { |
| return hlist_unhashed(&inode->i_hash); |
| } |
| |
| /* |
| * inode->i_mutex nesting subclasses for the lock validator: |
| * |
| * 0: the object of the current VFS operation |
| * 1: parent |
| * 2: child/target |
| * 3: xattr |
| * 4: second non-directory |
| * 5: second parent (when locking independent directories in rename) |
| * |
| * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two |
| * non-directories at once. |
| * |
| * The locking order between these classes is |
| * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
| */ |
| enum inode_i_mutex_lock_class |
| { |
| I_MUTEX_NORMAL, |
| I_MUTEX_PARENT, |
| I_MUTEX_CHILD, |
| I_MUTEX_XATTR, |
| I_MUTEX_NONDIR2, |
| I_MUTEX_PARENT2, |
| }; |
| |
| void lock_two_nondirectories(struct inode *, struct inode*); |
| void unlock_two_nondirectories(struct inode *, struct inode*); |
| |
| /* |
| * 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) |
| preempt_disable(); |
| write_seqcount_begin(&inode->i_size_seqcount); |
| inode->i_size = i_size; |
| write_seqcount_end(&inode->i_size_seqcount); |
| preempt_enable(); |
| #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| preempt_disable(); |
| inode->i_size = i_size; |
| preempt_enable(); |
| #else |
| inode->i_size = i_size; |
| #endif |
| } |
| |
| /* Helper functions so that in most cases filesystems will |
| * not need to deal directly with kuid_t and kgid_t and can |
| * instead deal with the raw numeric values that are stored |
| * in the filesystem. |
| */ |
| static inline uid_t i_uid_read(const struct inode *inode) |
| { |
| return from_kuid(&init_user_ns, inode->i_uid); |
| } |
| |
| static inline gid_t i_gid_read(const struct inode *inode) |
| { |
| return from_kgid(&init_user_ns, inode->i_gid); |
| } |
| |
| static inline void i_uid_write(struct inode *inode, uid_t uid) |
| { |
| inode->i_uid = make_kuid(&init_user_ns, uid); |
| } |
| |
| static inline void i_gid_write(struct inode *inode, gid_t gid) |
| { |
| inode->i_gid = make_kgid(&init_user_ns, gid); |
| } |
| |
| 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 */ |
| kuid_t uid, euid; /* uid/euid of process setting the owner */ |
| int signum; /* posix.1b rt signal to be delivered on IO */ |
| }; |
| |
| /* |
| * Track a single file's readahead state |
| */ |
| struct file_ra_state { |
| pgoff_t start; /* where readahead started */ |
| unsigned int size; /* # of readahead pages */ |
| unsigned int async_size; /* do asynchronous readahead when |
| there are only # of pages ahead */ |
| |
| unsigned int ra_pages; /* Maximum readahead window */ |
| unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
| loff_t prev_pos; /* Cache last read() position */ |
| }; |
| |
| /* |
| * Check if @index falls in the readahead windows. |
| */ |
| static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
| { |
| return (index >= ra->start && |
| index < ra->start + ra->size); |
| } |
| |
| struct file { |
| union { |
| struct llist_node fu_llist; |
| struct rcu_head fu_rcuhead; |
| } f_u; |
| struct path f_path; |
| struct inode *f_inode; /* cached value */ |
| const struct file_operations *f_op; |
| |
| /* |
| * Protects f_ep_links, f_flags. |
| * Must not be taken from IRQ context. |
| */ |
| spinlock_t f_lock; |
| atomic_long_t f_count; |
| unsigned int f_flags; |
| fmode_t f_mode; |
| struct mutex f_pos_lock; |
| loff_t f_pos; |
| struct fown_struct f_owner; |
| const struct cred *f_cred; |
| struct file_ra_state f_ra; |
| |
| u64 f_version; |
| #ifdef CONFIG_SECURITY |
| void *f_security; |
| #endif |
| /* needed for tty driver, and maybe others */ |
| void *private_data; |
| |
| #ifdef CONFIG_EPOLL |
| /* Used by fs/eventpoll.c to link all the hooks to this file */ |
| struct list_head f_ep_links; |
| struct list_head f_tfile_llink; |
| #endif /* #ifdef CONFIG_EPOLL */ |
| struct address_space *f_mapping; |
| } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
| |
| struct file_handle { |
| __u32 handle_bytes; |
| int handle_type; |
| /* file identifier */ |
| unsigned char f_handle[0]; |
| }; |
| |
| 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) |
| |
| #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 (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
| #elif BITS_PER_LONG==64 |
| #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL) |
| #endif |
| |
| #define FL_POSIX 1 |
| #define FL_FLOCK 2 |
| #define FL_DELEG 4 /* NFSv4 delegation */ |
| #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 */ |
| #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
| #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ |
| #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
| #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
| |
| /* |
| * Special return value from posix_lock_file() and vfs_lock_file() for |
| * asynchronous locking. |
| */ |
| #define FILE_LOCK_DEFERRED 1 |
| |
| /* legacy typedef, should eventually be removed */ |
| typedef void *fl_owner_t; |
| |
| struct file_lock; |
| |
| struct file_lock_operations { |
| void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| void (*fl_release_private)(struct file_lock *); |
| }; |
| |
| struct lock_manager_operations { |
| int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
| unsigned long (*lm_owner_key)(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 *); |
| int (*lm_change)(struct file_lock *, int, struct list_head *); |
| void (*lm_setup)(struct file_lock *, void **); |
| }; |
| |
| struct lock_manager { |
| struct list_head list; |
| /* |
| * NFSv4 and up also want opens blocked during the grace period; |
| * NLM doesn't care: |
| */ |
| bool block_opens; |
| }; |
| |
| struct net; |
| void locks_start_grace(struct net *, struct lock_manager *); |
| void locks_end_grace(struct lock_manager *); |
| int locks_in_grace(struct net *); |
| int opens_in_grace(struct net *); |
| |
| /* that will die - we need it for nfs_lock_info */ |
| #include <linux/nfs_fs_i.h> |
| |
| /* |
| * struct file_lock represents a generic "file lock". It's used to represent |
| * POSIX byte range locks, BSD (flock) locks, and leases. It's important to |
| * note that the same struct is used to represent both a request for a lock and |
| * the lock itself, but the same object is never used for both. |
| * |
| * FIXME: should we create a separate "struct lock_request" to help distinguish |
| * these two uses? |
| * |
| * The varous i_flctx lists are ordered by: |
| * |
| * 1) lock owner |
| * 2) lock range start |
| * 3) lock range end |
| * |
| * Obviously, the last two criteria only matter for POSIX locks. |
| */ |
| struct file_lock { |
| struct file_lock *fl_next; /* singly linked list for this inode */ |
| struct list_head fl_list; /* link into file_lock_context */ |
| struct hlist_node fl_link; /* node in global lists */ |
| struct list_head fl_block; /* circular list of blocked processes */ |
| fl_owner_t fl_owner; |
| unsigned int fl_flags; |
| unsigned char fl_type; |
| unsigned int fl_pid; |
| int fl_link_cpu; /* what cpu's list is this on? */ |
| struct pid *fl_nspid; |
| wait_queue_head_t fl_wait; |
| struct file *fl_file; |
| loff_t fl_start; |
| loff_t fl_end; |
| |
| struct fasync_struct * fl_fasync; /* for lease break notifications */ |
| /* for lease breaks: */ |
| unsigned long fl_break_time; |
| unsigned long fl_downgrade_time; |
| |
| const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
| const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
| union { |
| struct nfs_lock_info nfs_fl; |
| struct nfs4_lock_info nfs4_fl; |
| struct { |
| struct list_head link; /* link in AFS vnode's pending_locks list */ |
| int state; /* state of grant or error if -ve */ |
| } afs; |
| } fl_u; |
| }; |
| |
| struct file_lock_context { |
| spinlock_t flc_lock; |
| struct list_head flc_flock; |
| struct list_head flc_posix; |
| struct list_head flc_lease; |
| }; |
| |
| /* The following constant reflects the upper bound of the file/locking space */ |
| #ifndef OFFSET_MAX |
| #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
| #define OFFSET_MAX INT_LIMIT(loff_t) |
| #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
| #endif |
| |
| #include <linux/fcntl.h> |
| |
| extern void send_sigio(struct fown_struct *fown, int fd, int band); |
| |
| #ifdef CONFIG_FILE_LOCKING |
| extern int fcntl_getlk(struct file *, unsigned int, 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 *, unsigned int, struct flock64 __user *); |
| extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
| struct flock64 __user *); |
| #endif |
| |
| extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
| extern int fcntl_getlease(struct file *filp); |
| |
| /* fs/locks.c */ |
| void locks_free_lock_context(struct file_lock_context *ctx); |
| void locks_free_lock(struct file_lock *fl); |
| extern void locks_init_lock(struct file_lock *); |
| extern struct file_lock * locks_alloc_lock(void); |
| extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
| extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
| extern void locks_remove_posix(struct file *, fl_owner_t); |
| 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_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 locks_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) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int fcntl_setlk(unsigned int fd, struct file *file, |
| unsigned int cmd, struct flock __user *user) |
| { |
| return -EACCES; |
| } |
| |
| #if BITS_PER_LONG == 32 |
| static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
| struct flock64 __user *user) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
| unsigned int cmd, struct flock64 __user *user) |
| { |
| return -EACCES; |
| } |
| #endif |
| static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int fcntl_getlease(struct file *filp) |
| { |
| return F_UNLCK; |
| } |
| |
| static inline void |
| locks_free_lock_context(struct file_lock_context *ctx) |
| { |
| } |
| |
| static inline void locks_init_lock(struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
| { |
| return; |
| } |
| |
| static inline void locks_remove_file(struct file *filp) |
| { |
| return; |
| } |
| |
| static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
| { |
| return; |
| } |
| |
| static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
| struct file_lock *conflock) |
| { |
| return -ENOLCK; |
| } |
| |
| static inline int posix_unblock_lock(struct file_lock *waiter) |
| { |
| return -ENOENT; |
| } |
| |
| static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
| { |
| return 0; |
| } |
| |
| static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
| struct file_lock *fl, struct file_lock *conf) |
| { |
| return -ENOLCK; |
| } |
| |
| static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
| { |
| return 0; |
| } |
| |
| static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
| { |
| return -ENOLCK; |
| } |
| |
| static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
| { |
| return 0; |
| } |
| |
| static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
| { |
| return; |
| } |
| |
| static inline int generic_setlease(struct file *filp, long arg, |
| struct file_lock **flp, void **priv) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int vfs_setlease(struct file *filp, long arg, |
| struct file_lock **lease, void **priv) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int lease_modify(struct file_lock *fl, int arg, |
| struct list_head *dispose) |
| { |
| 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 locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
| { |
| return locks_lock_inode_wait(file_inode(filp), fl); |
| } |
| |
| struct fasync_struct { |
| spinlock_t fa_lock; |
| int magic; |
| int fa_fd; |
| struct fasync_struct *fa_next; /* singly linked list */ |
| struct file *fa_file; |
| struct rcu_head fa_rcu; |
| }; |
| |
| #define FASYNC_MAGIC 0x4601 |
| |
| /* SMP safe fasync helpers: */ |
| extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
| extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
| extern int fasync_remove_entry(struct file *, struct fasync_struct **); |
| extern struct fasync_struct *fasync_alloc(void); |
| extern void fasync_free(struct fasync_struct *); |
| |
| /* can be called from interrupts */ |
| extern void kill_fasync(struct fasync_struct **, int, int); |
| |
| extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
| extern void 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); |
| |
| struct mm_struct; |
| |
| /* |
| * Umount options |
| */ |
| |
| #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
| #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
| #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
| #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
| #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ |
| |
| /* sb->s_iflags */ |
| #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ |
| #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
| |
| /* Possible states of 'frozen' field */ |
| enum { |
| SB_UNFROZEN = 0, /* FS is unfrozen */ |
| SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ |
| SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
| SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop |
| * internal threads if needed) */ |
| SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ |
| }; |
| |
| #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) |
| |
| struct sb_writers { |
| int frozen; /* Is sb frozen? */ |
| wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ |
| struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; |
| }; |
| |
| struct super_block { |
| struct list_head s_list; /* Keep this first */ |
| dev_t s_dev; /* search index; _not_ kdev_t */ |
| unsigned char s_blocksize_bits; |
| unsigned long s_blocksize; |
| loff_t s_maxbytes; /* Max file size */ |
| struct file_system_type *s_type; |
| const struct super_operations *s_op; |
| const struct dquot_operations *dq_op; |
| const struct quotactl_ops *s_qcop; |
| const struct export_operations *s_export_op; |
| unsigned long s_flags; |
| unsigned long s_iflags; /* internal SB_I_* flags */ |
| unsigned long s_magic; |
| struct dentry *s_root; |
| struct rw_semaphore s_umount; |
| int s_count; |
| atomic_t s_active; |
| #ifdef CONFIG_SECURITY |
| void *s_security; |
| #endif |
| const struct xattr_handler **s_xattr; |
| |
| struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
| struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
| struct block_device *s_bdev; |
| struct backing_dev_info *s_bdi; |
| struct mtd_info *s_mtd; |
| struct hlist_node s_instances; |
| unsigned int s_quota_types; /* Bitmask of supported quota types */ |
| struct quota_info s_dquot; /* Diskquota specific options */ |
| |
| struct sb_writers s_writers; |
| |
| char s_id[32]; /* Informational name */ |
| u8 s_uuid[16]; /* UUID */ |
| |
| void *s_fs_info; /* Filesystem private info */ |
| unsigned int s_max_links; |
| fmode_t s_mode; |
| |
| /* Granularity of c/m/atime in ns. |
| Cannot be worse than a second */ |
| u32 s_time_gran; |
| |
| /* |
| * The next field is for VFS *only*. No filesystems have any business |
| * even looking at it. You had been warned. |
| */ |
| struct mutex s_vfs_rename_mutex; /* Kludge */ |
| |
| /* |
| * Filesystem subtype. If non-empty the filesystem type field |
| * in /proc/mounts will be "type.subtype" |
| */ |
| char *s_subtype; |
| |
| /* |
| * Saved mount options for lazy filesystems using |
| * generic_show_options() |
| */ |
| char __rcu *s_options; |
| const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
| |
| /* |
| * Saved pool identifier for cleancache (-1 means none) |
| */ |
| int cleancache_poolid; |
| |
| struct shrinker s_shrink; /* per-sb shrinker handle */ |
| |
| /* Number of inodes with nlink == 0 but still referenced */ |
| atomic_long_t s_remove_count; |
| |
| /* Being remounted read-only */ |
| int s_readonly_remount; |
| |
| /* AIO completions deferred from interrupt context */ |
| struct workqueue_struct *s_dio_done_wq; |
| struct hlist_head s_pins; |
| |
| /* |
| * Keep the lru lists last in the structure so they always sit on their |
| * own individual cachelines. |
| */ |
| struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; |
| struct list_lru s_inode_lru ____cacheline_aligned_in_smp; |
| struct rcu_head rcu; |
| struct work_struct destroy_work; |
| |
| struct mutex s_sync_lock; /* sync serialisation lock */ |
| |
| /* |
| * Indicates how deep in a filesystem stack this SB is |
| */ |
| int s_stack_depth; |
| |
| /* s_inode_list_lock protects s_inodes */ |
| spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; |
| struct list_head s_inodes; /* all inodes */ |
| }; |
| |
| extern struct timespec current_fs_time(struct super_block *sb); |
| |
| /* |
| * Snapshotting support. |
| */ |
| |
| void __sb_end_write(struct super_block *sb, int level); |
| int __sb_start_write(struct super_block *sb, int level, bool wait); |
| |
| #define __sb_writers_acquired(sb, lev) \ |
| percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
| #define __sb_writers_release(sb, lev) \ |
| percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
| |
| /** |
| * sb_end_write - drop write access to a superblock |
| * @sb: the super we wrote to |
| * |
| * Decrement number of writers to the filesystem. Wake up possible waiters |
| * wanting to freeze the filesystem. |
| */ |
| static inline void sb_end_write(struct super_block *sb) |
| { |
| __sb_end_write(sb, SB_FREEZE_WRITE); |
| } |
| |
| /** |
| * sb_end_pagefault - drop write access to a superblock from a page fault |
| * @sb: the super we wrote to |
| * |
| * Decrement number of processes handling write page fault to the filesystem. |
| * Wake up possible waiters wanting to freeze the filesystem. |
| */ |
| static inline void sb_end_pagefault(struct super_block *sb) |
| { |
| __sb_end_write(sb, SB_FREEZE_PAGEFAULT); |
| } |
| |
| /** |
| * sb_end_intwrite - drop write access to a superblock for internal fs purposes |
| * @sb: the super we wrote to |
| * |
| * Decrement fs-internal number of writers to the filesystem. Wake up possible |
| * waiters wanting to freeze the filesystem. |
| */ |
| static inline void sb_end_intwrite(struct super_block *sb) |
| { |
| __sb_end_write(sb, SB_FREEZE_FS); |
| } |
| |
| /** |
| * sb_start_write - get write access to a superblock |
| * @sb: the super we write to |
| * |
| * When a process wants to write data or metadata to a file system (i.e. dirty |
| * a page or an inode), it should embed the operation in a sb_start_write() - |
| * sb_end_write() pair to get exclusion against file system freezing. This |
| * function increments number of writers preventing freezing. If the file |
| * system is already frozen, the function waits until the file system is |
| * thawed. |
| * |
| * Since freeze protection behaves as a lock, users have to preserve |
| * ordering of freeze protection and other filesystem locks. Generally, |
| * freeze protection should be the outermost lock. In particular, we have: |
| * |
| * sb_start_write |
| * -> i_mutex (write path, truncate, directory ops, ...) |
| * -> s_umount (freeze_super, thaw_super) |
| */ |
| static inline void sb_start_write(struct super_block *sb) |
| { |
| __sb_start_write(sb, SB_FREEZE_WRITE, true); |
| } |
| |
| static inline int sb_start_write_trylock(struct super_block *sb) |
| { |
| return __sb_start_write(sb, SB_FREEZE_WRITE, false); |
| } |
| |
| /** |
| * sb_start_pagefault - get write access to a superblock from a page fault |
| * @sb: the super we write to |
| * |
| * When a process starts handling write page fault, it should embed the |
| * operation into sb_start_pagefault() - sb_end_pagefault() pair to get |
| * exclusion against file system freezing. This is needed since the page fault |
| * is going to dirty a page. This function increments number of running page |
| * faults preventing freezing. If the file system is already frozen, the |
| * function waits until the file system is thawed. |
| * |
| * Since page fault freeze protection behaves as a lock, users have to preserve |
| * ordering of freeze protection and other filesystem locks. It is advised to |
| * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault |
| * handling code implies lock dependency: |
| * |
| * mmap_sem |
| * -> sb_start_pagefault |
| */ |
| static inline void sb_start_pagefault(struct super_block *sb) |
| { |
| __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); |
| } |
| |
| /* |
| * sb_start_intwrite - get write access to a superblock for internal fs purposes |
| * @sb: the super we write to |
| * |
| * This is the third level of protection against filesystem freezing. It is |
| * free for use by a filesystem. The only requirement is that it must rank |
| * below sb_start_pagefault. |
| * |
| * For example filesystem can call sb_start_intwrite() when starting a |
| * transaction which somewhat eases handling of freezing for internal sources |
| * of filesystem changes (internal fs threads, discarding preallocation on file |
| * close, etc.). |
| */ |
| static inline void sb_start_intwrite(struct super_block *sb) |
| { |
| __sb_start_write(sb, SB_FREEZE_FS, true); |
| } |
| |
| |
| extern bool inode_owner_or_capable(const struct inode *inode); |
| |
| /* |
| * VFS helper functions.. |
| */ |
| extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
| extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
| extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
| extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
| extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
| extern int vfs_rmdir(struct inode *, struct dentry *); |
| extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
| extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
| extern int vfs_whiteout(struct inode *, struct dentry *); |
| |
| /* |
| * VFS dentry helper functions. |
| */ |
| extern void dentry_unhash(struct dentry *dentry); |
| |
| /* |
| * VFS file helper functions. |
| */ |
| extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
| umode_t mode); |
| /* |
| * VFS FS_IOC_FIEMAP helper definitions. |
| */ |
| struct fiemap_extent_info { |
| unsigned int fi_flags; /* Flags as passed from user */ |
| unsigned int fi_extents_mapped; /* Number of mapped extents */ |
| unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
| struct fiemap_extent __user *fi_extents_start; /* Start of |
| fiemap_extent array */ |
| }; |
| int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
| u64 phys, u64 len, u32 flags); |
| int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
| |
| /* |
| * File types |
| * |
| * NOTE! These match bits 12..15 of stat.st_mode |
| * (ie "(i_mode >> 12) & 15"). |
| */ |
| #define DT_UNKNOWN 0 |
| #define DT_FIFO 1 |
| #define DT_CHR 2 |
| #define DT_DIR 4 |
| #define DT_BLK 6 |
| #define DT_REG 8 |
| #define DT_LNK 10 |
| #define DT_SOCK 12 |
| #define DT_WHT 14 |
| |
| /* |
| * This is the "filldir" function type, used by readdir() to let |
| * the kernel specify what kind of dirent layout it wants to have. |
| * This allows the kernel to read directories into kernel space or |
| * to have different dirent layouts depending on the binary type. |
| */ |
| struct dir_context; |
| typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, |
| unsigned); |
| |
| struct dir_context { |
| const filldir_t actor; |
| loff_t pos; |
| }; |
| |
| struct block_device_operations; |
| |
| /* These macros are for out of kernel modules to test that |
| * the kernel supports the unlocked_ioctl and compat_ioctl |
| * fields in struct file_operations. */ |
| #define HAVE_COMPAT_IOCTL 1 |
| #define HAVE_UNLOCKED_IOCTL 1 |
| |
| /* |
| * These flags let !MMU mmap() govern direct device mapping vs immediate |
| * copying more easily for MAP_PRIVATE, especially for ROM filesystems. |
| * |
| * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) |
| * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) |
| * NOMMU_MAP_READ: Can be mapped for reading |
| * NOMMU_MAP_WRITE: Can be mapped for writing |
| * NOMMU_MAP_EXEC: Can be mapped for execution |
| */ |
| #define NOMMU_MAP_COPY 0x00000001 |
| #define NOMMU_MAP_DIRECT 0x00000008 |
| #define NOMMU_MAP_READ VM_MAYREAD |
| #define NOMMU_MAP_WRITE VM_MAYWRITE |
| #define NOMMU_MAP_EXEC VM_MAYEXEC |
| |
| #define NOMMU_VMFLAGS \ |
| (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) |
| |
| |
| struct iov_iter; |
| |
| 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 (*read_iter) (struct kiocb *, struct iov_iter *); |
| ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); |
| int (*iterate) (struct file *, struct dir_context *); |
| unsigned int (*poll) (struct file *, struct poll_table_struct *); |
| 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 *, 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 *); |
| ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
| unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| int (*check_flags)(int); |
| int (*flock) (struct file *, int, struct file_lock *); |
| ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
| ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
| int (*setlease)(struct file *, long, struct file_lock **, void **); |
| long (*fallocate)(struct file *file, int mode, loff_t offset, |
| loff_t len); |
| void (*show_fdinfo)(struct seq_file *m, struct file *f); |
| #ifndef CONFIG_MMU |
| unsigned (*mmap_capabilities)(struct file *); |
| #endif |
| }; |
| |
| struct inode_operations { |
| struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
| const char * (*get_link) (struct dentry *, struct inode *, 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 inode *, void *); |
| |
| int (*create) (struct inode *,struct dentry *, umode_t, bool); |
| 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 *,umode_t); |
| int (*rmdir) (struct inode *,struct dentry *); |
| int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
| int (*rename) (struct inode *, struct dentry *, |
| struct inode *, struct dentry *); |
| int (*rename2) (struct inode *, struct dentry *, |
| struct inode *, struct dentry *, unsigned int); |
| int (*setattr) (struct dentry *, struct iattr *); |
| int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
| int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
| ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
| ssize_t (*listxattr) (struct dentry *, char *, size_t); |
| int (*removexattr) (struct dentry *, const char *); |
| int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
| u64 len); |
| int (*update_time)(struct inode *, struct timespec *, int); |
| int (*atomic_open)(struct inode *, struct dentry *, |
| struct file *, unsigned open_flag, |
| umode_t create_mode, int *opened); |
| int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
| int (*set_acl)(struct inode *, struct posix_acl *, int); |
| } ____cacheline_aligned; |
| |
| 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_read(struct file *, char __user *, size_t, loff_t *); |
| extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
| extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
| unsigned long, loff_t *); |
| extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
| unsigned long, loff_t *); |
| |
| struct super_operations { |
| struct inode *(*alloc_inode)(struct super_block *sb); |
| void (*destroy_inode)(struct inode *); |
| |
| void (*dirty_inode) (struct inode *, int flags); |
| int (*write_inode) (struct inode *, struct writeback_control *wbc); |
| int (*drop_inode) (struct inode *); |
| void (*evict_inode) (struct inode *); |
| void (*put_super) (struct super_block *); |
| int (*sync_fs)(struct super_block *sb, int wait); |
| int (*freeze_super) (struct super_block *); |
| int (*freeze_fs) (struct super_block *); |
| int (*thaw_super) (struct super_block *); |
| int (*unfreeze_fs) (struct super_block *); |
| int (*statfs) (struct dentry *, struct kstatfs *); |
| int (*remount_fs) (struct super_block *, int *, char *); |
| void (*umount_begin) (struct super_block *); |
| |
| int (*show_options)(struct seq_file *, struct dentry *); |
| int (*show_devname)(struct seq_file *, struct dentry *); |
| int (*show_path)(struct seq_file *, struct dentry *); |
| int (*show_stats)(struct seq_file *, struct dentry *); |
| #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); |
| struct dquot **(*get_dquots)(struct inode *); |
| #endif |
| int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
| long (*nr_cached_objects)(struct super_block *, |
| struct shrink_control *); |
| long (*free_cached_objects)(struct super_block *, |
| struct shrink_control *); |
| }; |
| |
| /* |
| * Inode flags - they have no relation 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 */ |
| #define S_IMA 1024 /* Inode has an associated IMA struct */ |
| #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
| #define S_NOSEC 4096 /* no suid or xattr security attributes */ |
| #ifdef CONFIG_FS_DAX |
| #define S_DAX 8192 /* Direct Access, avoiding the page cache */ |
| #else |
| #define S_DAX 0 /* Make all the DAX code disappear */ |
| #endif |
| |
| /* |
| * Note that nosuid etc flags are inode-specific: setting some file-system |
| * flags just means all the inodes inherit those flags by default. It might be |
| * possible to override it selectively if you really wanted to with some |
| * ioctl() that is not currently implemented. |
| * |
| * Exception: MS_RDONLY is always applied to the entire file system. |
| * |
| * Unfortunately, it is possible to change a filesystems flags with it mounted |
| * with files in use. This means that all of the inodes will not have their |
| * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| */ |
| #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) |
| |
| #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| ((inode)->i_flags & S_SYNC)) |
| #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
| #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
| #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
| |
| #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
| #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| |
| #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
| #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
| #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
| #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
| #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
| |
| #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
| (inode)->i_rdev == WHITEOUT_DEV) |
| |
| /* |
| * Inode state bits. Protected by inode->i_lock |
| * |
| * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
| * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
| * |
| * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
| * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
| * various stages of removing an inode. |
| * |
| * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
| * |
| * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
| * fdatasync(). i_atime is the usual cause. |
| * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
| * these changes separately from I_DIRTY_SYNC so that we |
| * don't have to write inode on fdatasync() when only |
| * mtime has changed in it. |
| * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
| * I_NEW Serves as both a mutex and completion notification. |
| * New inodes set I_NEW. If two processes both create |
| * the same inode, one of them will release its inode and |
| * wait for I_NEW to be released before returning. |
| * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
| * also cause waiting on I_NEW, without I_NEW actually |
| * being set. find_inode() uses this to prevent returning |
| * nearly-dead inodes. |
| * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
| * is zero. I_FREEING must be set when I_WILL_FREE is |
| * cleared. |
| * I_FREEING Set when inode is about to be freed but still has dirty |
| * pages or buffers attached or the inode itself is still |
| * dirty. |
| * I_CLEAR Added by clear_inode(). In this state the inode is |
| * clean and can be destroyed. Inode keeps I_FREEING. |
| * |
| * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
| * prohibited for many purposes. iget() must wait for |
| * the inode to be completely released, then create it |
| * anew. Other functions will just ignore such inodes, |
| * if appropriate. I_NEW is used for waiting. |
| * |
| * I_SYNC Writeback of inode is running. The bit is set during |
| * data writeback, and cleared with a wakeup on the bit |
| * address once it is done. The bit is also used to pin |
| * the inode in memory for flusher thread. |
| * |
| * 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(). |
| * |
| * 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) |
| #define I_DIRTY_DATASYNC (1 << 1) |
| #define I_DIRTY_PAGES (1 << 2) |
| #define __I_NEW 3 |
| #define I_NEW (1 << __I_NEW) |
| #define I_WILL_FREE (1 << 4) |
| #define I_FREEING (1 << 5) |
| #define I_CLEAR (1 << 6) |
| #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_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) |
| |
| 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); |
| } |
| |
| extern void inc_nlink(struct inode *inode); |
| extern void drop_nlink(struct inode *inode); |
| extern void clear_nlink(struct inode *inode); |
| extern void set_nlink(struct inode *inode, unsigned int nlink); |
| |
| static inline void inode_inc_link_count(struct inode *inode) |
| { |
| inc_nlink(inode); |
| mark_inode_dirty(inode); |
| } |
| |
| static inline void inode_dec_link_count(struct inode *inode) |
| { |
| drop_nlink(inode); |
| mark_inode_dirty(inode); |
| } |
| |
| /** |
| * inode_inc_iversion - increments i_version |
| * @inode: inode that need to be updated |
| * |
| * Every time the inode is modified, the i_version field will be incremented. |
| * The filesystem has to be mounted with i_version flag |
| */ |
| |
| static inline void inode_inc_iversion(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| inode->i_version++; |
| spin_unlock(&inode->i_lock); |
| } |
| |
| enum file_time_flags { |
| S_ATIME = 1, |
| S_MTIME = 2, |
| S_CTIME = 4, |
| 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) |
| { |
| if (!(file->f_flags & O_NOATIME)) |
| touch_atime(&file->f_path); |
| } |
| |
| int sync_inode(struct inode *inode, struct writeback_control *wbc); |
| int sync_inode_metadata(struct inode *inode, int wait); |
| |
| struct file_system_type { |
| const char *name; |
| int fs_flags; |
| #define FS_REQUIRES_DEV 1 |
| #define FS_BINARY_MOUNTDATA 2 |
| #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 *); |
| void (*kill_sb) (struct super_block *); |
| struct module *owner; |
| struct file_system_type * next; |
| struct hlist_head fs_supers; |
| |
| struct lock_class_key s_lock_key; |
| struct lock_class_key s_umount_key; |
| struct lock_class_key s_vfs_rename_key; |
| struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
| |
| struct lock_class_key i_lock_key; |
| struct lock_class_key i_mutex_key; |
| struct lock_class_key i_mutex_dir_key; |
| }; |
| |
| #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
| |
| extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
| void *data, int (*fill_super)(struct super_block *, void *, int)); |
| extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, |
| int (*fill_super)(struct super_block *, void *, int)); |
| extern struct dentry *mount_single(struct file_system_type *fs_type, |
| int flags, void *data, |
| int (*fill_super)(struct super_block *, void *, int)); |
| extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
| int flags, void *data, |
| int (*fill_super)(struct super_block *, void *, int)); |
| extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
| void generic_shutdown_super(struct super_block *sb); |
| void kill_block_super(struct super_block *sb); |
| void kill_anon_super(struct super_block *sb); |
| void kill_litter_super(struct super_block *sb); |
| void deactivate_super(struct super_block *sb); |
| void deactivate_locked_super(struct super_block *sb); |
| int set_anon_super(struct super_block *s, void *data); |
| 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 *), |
| int flags, void *data); |
| extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
| const struct super_operations *ops, |
| const struct dentry_operations *dops, |
| unsigned long); |
| |
| /* 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) |
| /* |
| * This one is to be used *ONLY* from ->open() instances. |
| * fops must be non-NULL, pinned down *and* module dependencies |
| * should be sufficient to pin the caller down as well. |
| */ |
| #define replace_fops(f, fops) \ |
| do { \ |
| struct file *__file = (f); \ |
| fops_put(__file->f_op); \ |
| BUG_ON(!(__file->f_op = (fops))); \ |
| } while(0) |
| |
| extern int register_filesystem(struct file_system_type *); |
| extern int unregister_filesystem(struct file_system_type *); |
| extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
| #define kern_mount(type) kern_mount_data(type, NULL) |
| extern void kern_unmount(struct vfsmount *mnt); |
| extern int may_umount_tree(struct vfsmount *); |
| extern int may_umount(struct vfsmount *); |
| extern long do_mount(const char *, const char __user *, |
| const char *, unsigned long, void *); |
| extern struct vfsmount *collect_mounts(struct path *); |
| extern void drop_collected_mounts(struct vfsmount *); |
| extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
| struct vfsmount *); |
| extern int vfs_statfs(struct path *, struct kstatfs *); |
| extern int user_statfs(const char __user *, struct kstatfs *); |
| extern int fd_statfs(int, struct kstatfs *); |
| 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 int current_umask(void); |
| |
| extern void ihold(struct inode * inode); |
| extern void iput(struct inode *); |
| extern int generic_update_time(struct inode *, struct timespec *, int); |
| |
| /* /sys/fs */ |
| extern struct kobject *fs_kobj; |
| |
| #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
| |
| #define FLOCK_VERIFY_READ 1 |
| #define FLOCK_VERIFY_WRITE 2 |
| |
| #ifdef CONFIG_FILE_LOCKING |
| extern int locks_mandatory_locked(struct file *); |
| extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
| |
| /* |
| * Candidates for mandatory locking have the setgid bit set |
| * but no group execute bit - an otherwise meaningless combination. |
| */ |
| |
| static inline int __mandatory_lock(struct inode *ino) |
| { |
| return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
| } |
| |
| /* |
| * ... and these candidates should be on MS_MANDLOCK mounted fs, |
| * otherwise these will be advisory locks |
| */ |
| |
| static inline int mandatory_lock(struct inode *ino) |
| { |
| return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
| } |
| |
| static inline int locks_verify_locked(struct file *file) |
| { |
| if (mandatory_lock(file_inode(file))) |
| return locks_mandatory_locked(file); |
| return 0; |
| } |
| |
| static inline int locks_verify_truncate(struct inode *inode, |
| struct file *filp, |
| loff_t size) |
| { |
| if (inode->i_flctx && 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) |
| { |
| /* |
| * Since this check is lockless, we must ensure that any refcounts |
| * taken are done before checking i_flctx->flc_lease. Otherwise, we |
| * could end up racing with tasks trying to set a new lease on this |
| * file. |
| */ |
| smp_mb(); |
| if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
| return __break_lease(inode, mode, FL_LEASE); |
| return 0; |
| } |
| |
| static inline int break_deleg(struct inode *inode, unsigned int mode) |
| { |
| /* |
| * Since this check is lockless, we must ensure that any refcounts |
| * taken are done before checking i_flctx->flc_lease. Otherwise, we |
| * could end up racing with tasks trying to set a new lease on this |
| * file. |
| */ |
| smp_mb(); |
| if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
| return __break_lease(inode, mode, FL_DELEG); |
| return 0; |
| } |
| |
| static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
| { |
| int ret; |
| |
| ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); |
| if (ret == -EWOULDBLOCK && delegated_inode) { |
| *delegated_inode = inode; |
| ihold(inode); |
| } |
| return ret; |
| } |
| |
| static inline int break_deleg_wait(struct inode **delegated_inode) |
| { |
| int ret; |
| |
| ret = break_deleg(*delegated_inode, O_WRONLY); |
| iput(*delegated_inode); |
| *delegated_inode = NULL; |
| return ret; |
| } |
| |
| static inline int break_layout(struct inode *inode, bool wait) |
| { |
| smp_mb(); |
| if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
| return __break_lease(inode, |
| wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, |
| FL_LAYOUT); |
| return 0; |
| } |
| |
| #else /* !CONFIG_FILE_LOCKING */ |
| static inline int locks_mandatory_locked(struct file *file) |
| { |
| return 0; |
| } |
| |
| static inline int locks_mandatory_area(int rw, struct inode *inode, |
| struct file *filp, loff_t offset, |
| size_t count) |
| { |
| return 0; |
| } |
| |
| static inline int __mandatory_lock(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int mandatory_lock(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int locks_verify_locked(struct file *file) |
| { |
| return 0; |
| } |
| |
| static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
| size_t size) |
| { |
| return 0; |
| } |
| |
| static inline int break_lease(struct inode *inode, unsigned int mode) |
| { |
| return 0; |
| } |
| |
| static inline int break_deleg(struct inode *inode, unsigned int mode) |
| { |
| return 0; |
| } |
| |
| static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
| { |
| return 0; |
| } |
| |
| static inline int break_deleg_wait(struct inode **delegated_inode) |
| { |
| BUG(); |
| return 0; |
| } |
| |
| static inline int break_layout(struct inode *inode, bool wait) |
| { |
| return 0; |
| } |
| |
| #endif /* CONFIG_FILE_LOCKING */ |
| |
| /* fs/open.c */ |
| struct audit_names; |
| struct filename { |
| const char *name; /* pointer to actual string */ |
| const __user char *uptr; /* original userland pointer */ |
| struct audit_names *aname; |
| int refcnt; |
| const char iname[]; |
| }; |
| |
| extern long vfs_truncate(struct path *, loff_t); |
| extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
| struct file *filp); |
| extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
| loff_t len); |
| extern long do_sys_open(int dfd, const char __user *filename, int flags, |
| umode_t mode); |
| 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 struct file * dentry_open(const struct path *, int, const struct cred *); |
| extern int filp_close(struct file *, fl_owner_t id); |
| |
| extern struct filename *getname_flags(const char __user *, int, int *); |
| extern struct filename *getname(const char __user *); |
| extern struct filename *getname_kernel(const char *); |
| extern void putname(struct filename *name); |
| |
| enum { |
| FILE_CREATED = 1, |
| FILE_OPENED = 2 |
| }; |
| extern int finish_open(struct file *file, struct dentry *dentry, |
| int (*open)(struct inode *, struct file *), |
| int *opened); |
| extern int finish_no_open(struct file *file, struct dentry *dentry); |
| |
| /* fs/ioctl.c */ |
| |
| extern int ioctl_preallocate(struct file *filp, void __user *argp); |
| |
| /* fs/dcache.c */ |
| extern void __init vfs_caches_init_early(void); |
| extern void __init vfs_caches_init(void); |
| |
| 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)) |
| |
| #ifdef CONFIG_BLOCK |
| extern int register_blkdev(unsigned int, const char *); |
| extern void unregister_blkdev(unsigned int, const char *); |
| extern struct block_device *bdget(dev_t); |
| extern struct block_device *bdgrab(struct block_device *bdev); |
| extern void bd_set_size(struct block_device *, loff_t size); |
| extern void bd_forget(struct inode *inode); |
| extern void bdput(struct block_device *); |
| extern void invalidate_bdev(struct block_device *); |
| extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
| extern int sync_blockdev(struct block_device *bdev); |
| extern void kill_bdev(struct block_device *); |
| 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 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; } |
| static inline void kill_bdev(struct block_device *bdev) {} |
| static inline void invalidate_bdev(struct block_device *bdev) {} |
| |
| static inline struct super_block *freeze_bdev(struct block_device *sb) |
| { |
| return NULL; |
| } |
| |
| static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
| { |
| return 0; |
| } |
| |
| static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) |
| { |
| } |
| |
| static inline int sb_is_blkdev_sb(struct super_block *sb) |
| { |
| return 0; |
| } |
| #endif |
| extern int sync_filesystem(struct super_block *); |
| extern const struct file_operations def_blk_fops; |
| extern const struct file_operations def_chr_fops; |
| #ifdef CONFIG_BLOCK |
| extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
| extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
| extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
| extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
| extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
| void *holder); |
| 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, |
| struct gendisk *disk); |
| #else |
| static inline int bd_link_disk_holder(struct block_device *bdev, |
| struct gendisk *disk) |
| { |
| return 0; |
| } |
| static inline void bd_unlink_disk_holder(struct block_device *bdev, |
| struct gendisk *disk) |
| { |
| } |
| #endif |
| #endif |
| |
| /* fs/char_dev.c */ |
| #define CHRDEV_MAJOR_HASH_SIZE 255 |
| extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
| extern int register_chrdev_region(dev_t, unsigned, const char *); |
| extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
| unsigned int count, const char *name, |
| const struct file_operations *fops); |
| extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
| unsigned int count, const char *name); |
| extern void unregister_chrdev_region(dev_t, unsigned); |
| extern void chrdev_show(struct seq_file *,off_t); |
| |
| static inline int register_chrdev(unsigned int major, const char *name, |
| const struct file_operations *fops) |
| { |
| return __register_chrdev(major, 0, 256, name, fops); |
| } |
| |
| static inline void unregister_chrdev(unsigned int major, const char *name) |
| { |
| __unregister_chrdev(major, 0, 256, name); |
| } |
| |
| /* fs/block_dev.c */ |
| #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
| #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
| |
| #ifdef CONFIG_BLOCK |
| #define BLKDEV_MAJOR_HASH_SIZE 255 |
| extern const char *__bdevname(dev_t, char *buffer); |
| extern const char *bdevname(struct block_device *bdev, char *buffer); |
| extern struct block_device *lookup_bdev(const char *); |
| extern 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 *); |
| |
| #ifdef CONFIG_BLOCK |
| /* |
| * return READ, READA, or WRITE |
| */ |
| #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
| |
| /* |
| * return data direction, READ or WRITE |
| */ |
| #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
| |
| extern void check_disk_size_change(struct gendisk *disk, |
| struct block_device *bdev); |
| extern int revalidate_disk(struct gendisk *); |
| extern int check_disk_change(struct block_device *); |
| extern int __invalidate_device(struct block_device *, bool); |
| extern int invalidate_partition(struct gendisk *, int); |
| #endif |
| unsigned long invalidate_mapping_pages(struct address_space *mapping, |
| pgoff_t start, pgoff_t end); |
| |
| static inline void invalidate_remote_inode(struct inode *inode) |
| { |
| if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| S_ISLNK(inode->i_mode)) |
| invalidate_mapping_pages(inode->i_mapping, 0, -1); |
| } |
| extern int invalidate_inode_pages2(struct address_space *mapping); |
| extern int invalidate_inode_pages2_range(struct address_space *mapping, |
| pgoff_t start, pgoff_t end); |
| extern int write_inode_now(struct inode *, int); |
| extern int filemap_fdatawrite(struct address_space *); |
| extern int filemap_flush(struct address_space *); |
| extern int filemap_fdatawait(struct address_space *); |
| extern void filemap_fdatawait_keep_errors(struct address_space *); |
| extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
| loff_t lend); |
| extern int filemap_write_and_wait(struct address_space *mapping); |
| extern int filemap_write_and_wait_range(struct address_space *mapping, |
| loff_t lstart, loff_t lend); |
| extern int __filemap_fdatawrite_range(struct address_space *mapping, |
| loff_t start, loff_t end, int sync_mode); |
| extern int filemap_fdatawrite_range(struct address_space *mapping, |
| loff_t start, loff_t end); |
| |
| extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
| int datasync); |
| extern int vfs_fsync(struct file *file, int datasync); |
| static inline int generic_write_sync(struct file *file, loff_t pos, loff_t count) |
| { |
| if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host)) |
| return 0; |
| return vfs_fsync_range(file, pos, pos + count - 1, |
| (file->f_flags & __O_SYNC) ? 0 : 1); |
| } |
| extern void emergency_sync(void); |
| extern void emergency_remount(void); |
| #ifdef CONFIG_BLOCK |
| extern sector_t bmap(struct inode *, sector_t); |
| #endif |
| extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
| extern int inode_permission(struct inode *, int); |
| extern int __inode_permission(struct inode *, int); |
| extern int generic_permission(struct inode *, int); |
| extern int __check_sticky(struct inode *dir, struct inode *inode); |
| |
| static inline bool execute_ok(struct inode *inode) |
| { |
| return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
| } |
| |
| static inline void file_start_write(struct file *file) |
| { |
| if (!S_ISREG(file_inode(file)->i_mode)) |
| return; |
| __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); |
| } |
| |
| static inline bool file_start_write_trylock(struct file *file) |
| { |
| if (!S_ISREG(file_inode(file)->i_mode)) |
| return true; |
| return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); |
| } |
| |
| static inline void file_end_write(struct file *file) |
| { |
| if (!S_ISREG(file_inode(file)->i_mode)) |
| return; |
| __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); |
| } |
| |
| /* |
| * 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_inode(file); |
| return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
| } |
| 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_inode(file)->i_writecount); |
| } |
| static inline bool inode_is_open_for_write(const struct inode *inode) |
| { |
| return atomic_read(&inode->i_writecount) > 0; |
| } |
| |
| #ifdef CONFIG_IMA |
| static inline void i_readcount_dec(struct inode *inode) |
| { |
| BUG_ON(!atomic_read(&inode->i_readcount)); |
| atomic_dec(&inode->i_readcount); |
| } |
| static inline void i_readcount_inc(struct inode *inode) |
| { |
| atomic_inc(&inode->i_readcount); |
| } |
| #else |
| static inline void i_readcount_dec(struct inode *inode) |
| { |
| return; |
| } |
| static inline void i_readcount_inc(struct inode *inode) |
| { |
| return; |
| } |
| #endif |
| extern int do_pipe_flags(int *, int); |
| |
| extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
| extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t); |
| extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *); |
| extern struct file * open_exec(const char *); |
| |
| /* fs/dcache.c -- generic fs support functions */ |
| extern int is_subdir(struct dentry *, struct dentry *); |
| extern int path_is_under(struct path *, struct path *); |
| |
| extern char *file_path(struct file *, char *, int); |
| |
| #include <linux/err.h> |
| |
| /* needed for stackable file system support */ |
| extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
| |
| extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
| |
| extern int inode_init_always(struct super_block *, struct inode *); |
| extern void inode_init_once(struct inode *); |
| extern void address_space_init_once(struct address_space *mapping); |
| extern struct inode * igrab(struct inode *); |
| extern ino_t iunique(struct super_block *, ino_t); |
| extern int inode_needs_sync(struct inode *inode); |
| extern int generic_delete_inode(struct inode *inode); |
| static inline int generic_drop_inode(struct inode *inode) |
| { |
| return !inode->i_nlink || inode_unhashed(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 struct inode *find_inode_nowait(struct super_block *, |
| unsigned long, |
| int (*match)(struct inode *, |
| unsigned long, void *), |
| void *data); |
| extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
| extern int insert_inode_locked(struct inode *); |
| #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| extern void lockdep_annotate_inode_mutex_key(struct inode *inode); |
| #else |
| static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; |
| #endif |
| extern void unlock_new_inode(struct inode *); |
| extern unsigned int get_next_ino(void); |
| |
| extern void __iget(struct inode * inode); |
| extern void iget_failed(struct inode *); |
| extern void clear_inode(struct inode *); |
| extern void __destroy_inode(struct inode *); |
| extern struct inode *new_inode_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_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) |
| { |
| __insert_inode_hash(inode, inode->i_ino); |
| } |
| |
| extern void __remove_inode_hash(struct inode *); |
| static inline void remove_inode_hash(struct inode *inode) |
| { |
| if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
| __remove_inode_hash(inode); |
| } |
| |
| extern void inode_sb_list_add(struct inode *inode); |
| |
| #ifdef CONFIG_BLOCK |
| extern blk_qc_t 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 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); |
| |
| 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); |
| |
| /* fs/block_dev.c */ |
| extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); |
| extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); |
| extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
| int datasync); |
| extern void block_sync_page(struct page *page); |
| |
| /* fs/splice.c */ |
| extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
| struct pipe_inode_info *, size_t, unsigned int); |
| extern ssize_t default_file_splice_read(struct file *, loff_t *, |
| struct pipe_inode_info *, size_t, unsigned int); |
| extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
| struct file *, loff_t *, size_t, unsigned int); |
| extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
| struct file *out, loff_t *, size_t len, unsigned int flags); |
| extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
| loff_t *opos, size_t len, unsigned int flags); |
| |
| |
| extern void |
| file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
| extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
| extern loff_t no_llseek(struct file *file, loff_t offset, int whence); |
| extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
| extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
| extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
| int whence, loff_t maxsize, loff_t eof); |
| extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
| int whence, loff_t size); |
| extern int generic_file_open(struct inode * inode, struct file * filp); |
| extern int nonseekable_open(struct inode * inode, struct file * filp); |
| |
| #ifdef CONFIG_BLOCK |
| typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
| loff_t file_offset); |
| |
| enum { |
| /* need locking between buffered and direct access */ |
| DIO_LOCKING = 0x01, |
| |
| /* filesystem does not support filling holes */ |
| DIO_SKIP_HOLES = 0x02, |
| |
| /* 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(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(struct kiocb *iocb, |
| struct inode *inode, |
| struct iov_iter *iter, loff_t offset, |
| get_block_t get_block) |
| { |
| 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); |
| |
| /* |
| * 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); |
| |
| 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 readlink_copy(char __user *, int, const char *); |
| extern int page_readlink(struct dentry *, char __user *, int); |
| extern const char *page_get_link(struct dentry *, struct inode *, 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 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); |
| extern int vfs_getattr(struct path *, struct kstat *); |
| void __inode_add_bytes(struct inode *inode, loff_t bytes); |
| void inode_add_bytes(struct inode *inode, loff_t bytes); |
| void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
| 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_get_link(struct dentry *, struct inode *, void **); |
| extern const struct inode_operations simple_symlink_inode_operations; |
| |
| extern int iterate_dir(struct file *, struct dir_context *); |
| |
| extern int vfs_stat(const char __user *, struct kstat *); |
| extern int vfs_lstat(const char __user *, struct kstat *); |
| extern int vfs_fstat(unsigned int, struct kstat *); |
| extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
| |
| extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
| unsigned long arg); |
| extern int __generic_block_fiemap(struct inode *inode, |
| struct fiemap_extent_info *fieinfo, |
| loff_t start, loff_t len, |
| get_block_t *get_block); |
| extern int generic_block_fiemap(struct inode *inode, |
| struct fiemap_extent_info *fieinfo, u64 start, |
| u64 len, get_block_t *get_block); |
| |
| extern void get_filesystem(struct file_system_type *fs); |
| extern void put_filesystem(struct file_system_type *fs); |
| extern struct file_system_type *get_fs_type(const char *name); |
| extern struct super_block *get_super(struct block_device *); |
| extern struct super_block *get_super_thawed(struct block_device *); |
| extern struct super_block *get_active_super(struct block_device *bdev); |
| 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 *); |
| extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
| extern int dcache_readdir(struct file *, struct dir_context *); |
| extern int simple_setattr(struct dentry *, struct iattr *); |
| extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| extern int simple_statfs(struct dentry *, struct kstatfs *); |
| extern int simple_open(struct inode *inode, struct file *file); |
| 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 *, 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, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata); |
| extern int simple_write_end(struct file *file, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata); |
| extern int always_delete_dentry(const struct dentry *); |
| extern struct inode *alloc_anon_inode(struct super_block *); |
| extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
| extern const struct dentry_operations simple_dentry_operations; |
| |
| extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
| 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 *); |
| extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
| extern void simple_release_fs(struct vfsmount **mount, int *count); |
| |
| extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
| loff_t *ppos, const void *from, size_t available); |
| extern 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 *, loff_t, loff_t, int); |
| extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
| |
| extern int generic_check_addressable(unsigned, u64); |
| |
| #ifdef CONFIG_MIGRATION |
| extern int buffer_migrate_page(struct address_space *, |
| struct page *, struct page *, |
| enum migrate_mode); |
| #else |
| #define buffer_migrate_page NULL |
| #endif |
| |
| extern int inode_change_ok(const struct inode *, struct iattr *); |
| extern int inode_newsize_ok(const struct inode *, loff_t offset); |
| extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
| |
| extern int file_update_time(struct file *file); |
| |
| extern int generic_show_options(struct seq_file *m, struct dentry *root); |
| extern void save_mount_options(struct super_block *sb, char *options); |
| extern void replace_mount_options(struct super_block *sb, char *options); |
| |
| 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; |
| |
| /* |
| * Don't strictly need d_lock here? If the parent ino could change |
| * then surely we'd have a deeper race in the caller? |
| */ |
| spin_lock(&dentry->d_lock); |
| res = dentry->d_parent->d_inode->i_ino; |
| spin_unlock(&dentry->d_lock); |
| return res; |
| } |
| |
| /* Transaction based IO helpers */ |
| |
| /* |
| * An argresp is stored in an allocated page and holds the |
| * size of the argument or response, along with its content |
| */ |
| struct simple_transaction_argresp { |
| ssize_t size; |
| char data[0]; |
| }; |
| |
| #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
| |
| char *simple_transaction_get(struct file *file, const char __user *buf, |
| size_t size); |
| ssize_t simple_transaction_read(struct file *file, char __user *buf, |
| size_t size, loff_t *pos); |
| int simple_transaction_release(struct inode *inode, struct file *file); |
| |
| void simple_transaction_set(struct file *file, size_t n); |
| |
| /* |
| * simple attribute files |
| * |
| * These attributes behave similar to those in sysfs: |
| * |
| * Writing to an attribute immediately sets a value, an open file can be |
| * written to multiple times. |
| * |
| * Reading from an attribute creates a buffer from the value that might get |
| * read with multiple read calls. When the attribute has been read |
| * completely, no further read calls are possible until the file is opened |
| * again. |
| * |
| * All attributes contain a text representation of a numeric value |
| * that are accessed with the get() and set() functions. |
| */ |
| #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| static int __fops ## _open(struct inode *inode, struct file *file) \ |
| { \ |
| __simple_attr_check_format(__fmt, 0ull); \ |
| return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| } \ |
| static const struct file_operations __fops = { \ |
| .owner = THIS_MODULE, \ |
| .open = __fops ## _open, \ |
| .release = simple_attr_release, \ |
| .read = simple_attr_read, \ |
| .write = simple_attr_write, \ |
| .llseek = generic_file_llseek, \ |
| } |
| |
| static inline __printf(1, 2) |
| void __simple_attr_check_format(const char *fmt, ...) |
| { |
| /* don't do anything, just let the compiler check the arguments; */ |
| } |
| |
| int simple_attr_open(struct inode *inode, struct file *file, |
| int (*get)(void *, u64 *), int (*set)(void *, u64), |
| const char *fmt); |
| int simple_attr_release(struct inode *inode, struct file *file); |
| ssize_t simple_attr_read(struct file *file, char __user *buf, |
| size_t len, loff_t *ppos); |
| ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| size_t len, loff_t *ppos); |
| |
| struct ctl_table; |
| int proc_nr_files(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| int proc_nr_dentry(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| int proc_nr_inodes(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| int __init get_filesystem_list(char *buf); |
| |
| #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
| #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
| |
| #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
| #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
| (flag & __FMODE_NONOTIFY))) |
| |
| static inline int is_sxid(umode_t mode) |
| { |
| return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); |
| } |
| |
| static inline int check_sticky(struct inode *dir, struct inode *inode) |
| { |
| if (!(dir->i_mode & S_ISVTX)) |
| return 0; |
| |
| return __check_sticky(dir, inode); |
| } |
| |
| static inline void inode_has_no_xattr(struct inode *inode) |
| { |
| if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
| inode->i_flags |= S_NOSEC; |
| } |
| |
| static inline bool is_root_inode(struct inode *inode) |
| { |
| return inode == inode->i_sb->s_root->d_inode; |
| } |
| |
| static inline bool dir_emit(struct dir_context *ctx, |
| const char *name, int namelen, |
| u64 ino, unsigned type) |
| { |
| return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; |
| } |
| static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) |
| { |
| return ctx->actor(ctx, ".", 1, ctx->pos, |
| file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; |
| } |
| static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) |
| { |
| return ctx->actor(ctx, "..", 2, ctx->pos, |
| parent_ino(file->f_path.dentry), DT_DIR) == 0; |
| } |
| static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) |
| { |
| if (ctx->pos == 0) { |
| if (!dir_emit_dot(file, ctx)) |
| return false; |
| ctx->pos = 1; |
| } |
| if (ctx->pos == 1) { |
| if (!dir_emit_dotdot(file, ctx)) |
| return false; |
| ctx->pos = 2; |
| } |
| return true; |
| } |
| static inline bool dir_relax(struct inode *inode) |
| { |
| mutex_unlock(&inode->i_mutex); |
| mutex_lock(&inode->i_mutex); |
| return !IS_DEADDIR(inode); |
| } |
| |
| extern bool path_noexec(const struct path *path); |
| extern void inode_nohighmem(struct inode *inode); |
| |
| #endif /* _LINUX_FS_H */ |