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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
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SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_FS_H#define _LINUX_FS_H
#include <linux/fs/super.h>#include <linux/vfsdebug.h>#include <linux/linkage.h>#include <linux/wait_bit.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/llist.h>#include <linux/radix-tree.h>#include <linux/xarray.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/mm_types.h>#include <linux/capability.h>#include <linux/semaphore.h>#include <linux/fcntl.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/workqueue.h>#include <linux/delayed_call.h>#include <linux/uuid.h>#include <linux/errseq.h>#include <linux/ioprio.h>#include <linux/build_bug.h>#include <linux/stddef.h>#include <linux/mount.h>#include <linux/cred.h>#include <linux/mnt_idmapping.h>#include <linux/slab.h>#include <linux/maple_tree.h>#include <linux/rw_hint.h>#include <linux/file_ref.h>#include <linux/unicode.h>
#include <asm/byteorder.h>#include <uapi/linux/fs.h>
struct bdi_writeback;struct bio;struct io_comp_batch;struct fiemap_extent_info;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 iov_iter;struct fsnotify_mark_connector;struct fs_context;struct fs_parameter_spec;struct file_kattr;struct iomap_ops;struct delegated_inode;
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 unsigned long get_max_files(void);extern unsigned int sysctl_nr_open;
typedef __kernel_rwf_t rwf_t;
struct buffer_head;typedef int (get_block_t)(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create);typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, ssize_t bytes, void *private);
#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 do_dentry_open() */
/* file is open for reading */#define FMODE_READ ((__force fmode_t)(1 << 0))/* file is open for writing */#define FMODE_WRITE ((__force fmode_t)(1 << 1))/* file is seekable */#define FMODE_LSEEK ((__force fmode_t)(1 << 2))/* file can be accessed using pread */#define FMODE_PREAD ((__force fmode_t)(1 << 3))/* file can be accessed using pwrite */#define FMODE_PWRITE ((__force fmode_t)(1 << 4))/* File is opened for execution with sys_execve / sys_uselib */#define FMODE_EXEC ((__force fmode_t)(1 << 5))/* File writes are restricted (block device specific) */#define FMODE_WRITE_RESTRICTED ((__force fmode_t)(1 << 6))/* File supports atomic writes */#define FMODE_CAN_ATOMIC_WRITE ((__force fmode_t)(1 << 7))
/* FMODE_* bit 8 */
/* 32bit hashes as llseek() offset (for directories) */#define FMODE_32BITHASH ((__force fmode_t)(1 << 9))/* 64bit hashes as llseek() offset (for directories) */#define FMODE_64BITHASH ((__force fmode_t)(1 << 10))
/* * 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)(1 << 11))
/* Expect random access pattern */#define FMODE_RANDOM ((__force fmode_t)(1 << 12))
/* Supports IOCB_HAS_METADATA */#define FMODE_HAS_METADATA ((__force fmode_t)(1 << 13))
/* File is opened with O_PATH; almost nothing can be done with it */#define FMODE_PATH ((__force fmode_t)(1 << 14))
/* File needs atomic accesses to f_pos */#define FMODE_ATOMIC_POS ((__force fmode_t)(1 << 15))/* Write access to underlying fs */#define FMODE_WRITER ((__force fmode_t)(1 << 16))/* Has read method(s) */#define FMODE_CAN_READ ((__force fmode_t)(1 << 17))/* Has write method(s) */#define FMODE_CAN_WRITE ((__force fmode_t)(1 << 18))
#define FMODE_OPENED ((__force fmode_t)(1 << 19))#define FMODE_CREATED ((__force fmode_t)(1 << 20))
/* File is stream-like */#define FMODE_STREAM ((__force fmode_t)(1 << 21))
/* File supports DIRECT IO */#define FMODE_CAN_ODIRECT ((__force fmode_t)(1 << 22))
#define FMODE_NOREUSE ((__force fmode_t)(1 << 23))
/* File is embedded in backing_file object */#define FMODE_BACKING ((__force fmode_t)(1 << 24))
/* * Together with FMODE_NONOTIFY_PERM defines which fsnotify events shouldn't be * generated (see below) */#define FMODE_NONOTIFY ((__force fmode_t)(1 << 25))
/* * Together with FMODE_NONOTIFY defines which fsnotify events shouldn't be * generated (see below) */#define FMODE_NONOTIFY_PERM ((__force fmode_t)(1 << 26))
/* File is capable of returning -EAGAIN if I/O will block */#define FMODE_NOWAIT ((__force fmode_t)(1 << 27))
/* File represents mount that needs unmounting */#define FMODE_NEED_UNMOUNT ((__force fmode_t)(1 << 28))
/* File does not contribute to nr_files count */#define FMODE_NOACCOUNT ((__force fmode_t)(1 << 29))
/* * The two FMODE_NONOTIFY* define which fsnotify events should not be generated * for an open file. These are the possible values of * (f->f_mode & FMODE_FSNOTIFY_MASK) and their meaning: * * FMODE_NONOTIFY - suppress all (incl. non-permission) events. * FMODE_NONOTIFY_PERM - suppress permission (incl. pre-content) events. * FMODE_NONOTIFY | FMODE_NONOTIFY_PERM - suppress only FAN_ACCESS_PERM. */#define FMODE_FSNOTIFY_MASK \ (FMODE_NONOTIFY | FMODE_NONOTIFY_PERM)
#define FMODE_FSNOTIFY_NONE(mode) \ ((mode & FMODE_FSNOTIFY_MASK) == FMODE_NONOTIFY)#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS#define FMODE_FSNOTIFY_HSM(mode) \ ((mode & FMODE_FSNOTIFY_MASK) == 0 || \ (mode & FMODE_FSNOTIFY_MASK) == (FMODE_NONOTIFY | FMODE_NONOTIFY_PERM))#define FMODE_FSNOTIFY_ACCESS_PERM(mode) \ ((mode & FMODE_FSNOTIFY_MASK) == 0)#else#define FMODE_FSNOTIFY_ACCESS_PERM(mode) 0#define FMODE_FSNOTIFY_HSM(mode) 0#endif
/* * 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_CTIME_SET (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)#define ATTR_TOUCH (1 << 17)#define ATTR_DELEG (1 << 18) /* Delegated attrs. Don't break write delegations */
/* * 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; /* * The two anonymous unions wrap structures with the same member. * * Filesystems raising FS_ALLOW_IDMAP need to use ia_vfs{g,u}id which * are a dedicated type requiring the filesystem to use the dedicated * helpers. Other filesystem can continue to use ia_{g,u}id until they * have been ported. * * They always contain the same value. In other words FS_ALLOW_IDMAP * pass down the same value on idmapped mounts as they would on regular * mounts. */ union { kuid_t ia_uid; vfsuid_t ia_vfsuid; }; union { kgid_t ia_gid; vfsgid_t ia_vfsgid; }; loff_t ia_size; struct timespec64 ia_atime; struct timespec64 ia_mtime; struct timespec64 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;};
/* * 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 read_folio(). * * address_space_operation functions return these large constants to indicate * special semantics to the caller. These are much larger than the bytes in a * page to allow for functions that return the number of bytes operated on in a * given page. */
enum positive_aop_returns { AOP_WRITEPAGE_ACTIVATE = 0x80000, AOP_TRUNCATED_PAGE = 0x80001,};
/* * oh the beauties of C type declarations. */struct page;struct address_space;struct writeback_control;struct readahead_control;
/* Match RWF_* bits to IOCB bits */#define IOCB_HIPRI (__force int) RWF_HIPRI#define IOCB_DSYNC (__force int) RWF_DSYNC#define IOCB_SYNC (__force int) RWF_SYNC#define IOCB_NOWAIT (__force int) RWF_NOWAIT#define IOCB_APPEND (__force int) RWF_APPEND#define IOCB_ATOMIC (__force int) RWF_ATOMIC#define IOCB_DONTCACHE (__force int) RWF_DONTCACHE#define IOCB_NOSIGNAL (__force int) RWF_NOSIGNAL
/* non-RWF related bits - start at 16 */#define IOCB_EVENTFD (1 << 16)#define IOCB_DIRECT (1 << 17)#define IOCB_WRITE (1 << 18)/* iocb->ki_waitq is valid */#define IOCB_WAITQ (1 << 19)#define IOCB_NOIO (1 << 20)/* can use bio alloc cache */#define IOCB_ALLOC_CACHE (1 << 21)/* kiocb is a read or write operation submitted by fs/aio.c. */#define IOCB_AIO_RW (1 << 22)#define IOCB_HAS_METADATA (1 << 23)
/* for use in trace events */#define TRACE_IOCB_STRINGS \ { IOCB_HIPRI, "HIPRI" }, \ { IOCB_DSYNC, "DSYNC" }, \ { IOCB_SYNC, "SYNC" }, \ { IOCB_NOWAIT, "NOWAIT" }, \ { IOCB_APPEND, "APPEND" }, \ { IOCB_ATOMIC, "ATOMIC" }, \ { IOCB_DONTCACHE, "DONTCACHE" }, \ { IOCB_EVENTFD, "EVENTFD"}, \ { IOCB_DIRECT, "DIRECT" }, \ { IOCB_WRITE, "WRITE" }, \ { IOCB_WAITQ, "WAITQ" }, \ { IOCB_NOIO, "NOIO" }, \ { IOCB_ALLOC_CACHE, "ALLOC_CACHE" }, \ { IOCB_AIO_RW, "AIO_RW" }, \ { IOCB_HAS_METADATA, "AIO_HAS_METADATA" }
struct kiocb { struct file *ki_filp; loff_t ki_pos; void (*ki_complete)(struct kiocb *iocb, long ret); void *private; int ki_flags; u16 ki_ioprio; /* See linux/ioprio.h */ u8 ki_write_stream;
/* * Only used for async buffered reads, where it denotes the page * waitqueue associated with completing the read. * Valid IFF IOCB_WAITQ is set. */ struct wait_page_queue *ki_waitq;};
static inline bool is_sync_kiocb(struct kiocb *kiocb){ return kiocb->ki_complete == NULL;}
struct address_space_operations { int (*read_folio)(struct file *, struct folio *);
/* Write back some dirty pages from this mapping. */ int (*writepages)(struct address_space *, struct writeback_control *);
/* Mark a folio dirty. Return true if this dirtied it */ bool (*dirty_folio)(struct address_space *, struct folio *);
void (*readahead)(struct readahead_control *);
int (*write_begin)(const struct kiocb *, struct address_space *mapping, loff_t pos, unsigned len, struct folio **foliop, void **fsdata); int (*write_end)(const struct kiocb *, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct folio *folio, void *fsdata);
/* Unfortunately this kludge is needed for FIBMAP. Don't use it */ sector_t (*bmap)(struct address_space *, sector_t); void (*invalidate_folio) (struct folio *, size_t offset, size_t len); bool (*release_folio)(struct folio *, gfp_t); void (*free_folio)(struct folio *folio); ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); /* * migrate the contents of a folio to the specified target. If * migrate_mode is MIGRATE_ASYNC, it must not block. */ int (*migrate_folio)(struct address_space *, struct folio *dst, struct folio *src, enum migrate_mode); int (*launder_folio)(struct folio *); bool (*is_partially_uptodate) (struct folio *, size_t from, size_t count); void (*is_dirty_writeback) (struct folio *, bool *dirty, bool *wb); int (*error_remove_folio)(struct address_space *, struct folio *);
/* 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;
/* Structure for tracking metadata buffer heads associated with the mapping */struct mapping_metadata_bhs { struct address_space *mapping; /* Mapping bhs are associated with */ spinlock_t lock; /* Lock protecting bh list */ struct list_head list; /* The list of bhs (b_assoc_buffers) */};
/** * struct address_space - Contents of a cacheable, mappable object. * @host: Owner, either the inode or the block_device. * @i_pages: Cached pages. * @invalidate_lock: Guards coherency between page cache contents and * file offset->disk block mappings in the filesystem during invalidates. * It is also used to block modification of page cache contents through * memory mappings. * @gfp_mask: Memory allocation flags to use for allocating pages. * @i_mmap_writable: Number of VM_SHARED, VM_MAYWRITE mappings. * @i_mmap: Tree of private and shared mappings. * @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable. * @nrpages: Number of page entries, protected by the i_pages lock. * @writeback_index: Writeback starts here. * @a_ops: Methods. * @flags: Error bits and flags (AS_*). * @wb_err: The most recent error which has occurred. * @i_private_lock: For use by the owner of the address_space. */struct address_space { struct inode *host; struct xarray i_pages; struct rw_semaphore invalidate_lock; gfp_t gfp_mask; atomic_t i_mmap_writable; struct rb_root_cached i_mmap; unsigned long nrpages; pgoff_t writeback_index; const struct address_space_operations *a_ops; unsigned long flags; errseq_t wb_err; spinlock_t i_private_lock; struct rw_semaphore i_mmap_rwsem;} __attribute__((aligned(sizeof(long)))) __randomize_layout; /* * On most architectures that alignment is already the case; but * must be enforced here for CRIS, to let the least significant bit * of struct folio's "mapping" pointer be used for FOLIO_MAPPING_ANON. */
/* XArray tags, for tagging dirty and writeback pages in the pagecache. */#define PAGECACHE_TAG_DIRTY XA_MARK_0#define PAGECACHE_TAG_WRITEBACK XA_MARK_1#define PAGECACHE_TAG_TOWRITE XA_MARK_2
/* * Returns true if any of the pages in the mapping are marked with the tag. */static inline bool mapping_tagged(const struct address_space *mapping, xa_mark_t tag){ return xa_marked(&mapping->i_pages, tag);}
static inline void i_mmap_lock_write(struct address_space *mapping){ down_write(&mapping->i_mmap_rwsem);}
static inline int i_mmap_trylock_write(struct address_space *mapping){ return down_write_trylock(&mapping->i_mmap_rwsem);}
static inline void i_mmap_unlock_write(struct address_space *mapping){ up_write(&mapping->i_mmap_rwsem);}
static inline int i_mmap_trylock_read(struct address_space *mapping){ return down_read_trylock(&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);}
static inline void i_mmap_assert_locked(struct address_space *mapping){ lockdep_assert_held(&mapping->i_mmap_rwsem);}
static inline void i_mmap_assert_write_locked(struct address_space *mapping){ lockdep_assert_held_write(&mapping->i_mmap_rwsem);}
/* * Might pages of this file be mapped into userspace? */static inline int mapping_mapped(const struct address_space *mapping){ return !RB_EMPTY_ROOT(&mapping->i_mmap.rb_root);}
/* * Might pages of this file have been modified in userspace? * Note that i_mmap_writable counts all VM_SHARED, VM_MAYWRITE vmas: do_mmap * 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(const 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))/* * ACL_DONT_CACHE is for stacked filesystems, that rely on underlying fs to * cache the ACL. This also means that ->get_inode_acl() can be called in RCU * mode with the LOOKUP_RCU flag. */#define ACL_DONT_CACHE ((void *)(-3))
static inline struct posix_acl *uncached_acl_sentinel(struct task_struct *task){ return (void *)task + 1;}
static inline boolis_uncached_acl(struct posix_acl *acl){ return (long)acl & 1;}
#define IOP_FASTPERM 0x0001#define IOP_LOOKUP 0x0002#define IOP_NOFOLLOW 0x0004#define IOP_XATTR 0x0008#define IOP_DEFAULT_READLINK 0x0010#define IOP_MGTIME 0x0020#define IOP_CACHED_LINK 0x0040#define IOP_FASTPERM_MAY_EXEC 0x0080#define IOP_FLCTX 0x0100
/* * Inode state bits. Protected by inode->i_lock * * Four bits determine the dirty state of the inode: I_DIRTY_SYNC, * I_DIRTY_DATASYNC, I_DIRTY_PAGES, and I_DIRTY_TIME. * * 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() (unless I_DIRTY_DATASYNC is also set). * Timestamp updates are 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 * e.g. the timestamps have changed. * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. * I_DIRTY_TIME The inode itself has dirty timestamps, and the * lazytime mount option is enabled. We keep track of this * separately from I_DIRTY_SYNC in order to implement * lazytime. This gets cleared if I_DIRTY_INODE * (I_DIRTY_SYNC and/or I_DIRTY_DATASYNC) gets set. But * I_DIRTY_TIME can still be set if I_DIRTY_SYNC is already * in place because writeback might already be in progress * and we don't want to lose the time update * 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_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to * synchronize competing switching instances and to tell * wb stat updates to grab the i_pages lock. See * inode_switch_wbs_work_fn() for details. * * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper * and work dirs among overlayfs mounts. * * I_CREATING New object's inode in the middle of setting up. * * I_DONTCACHE Evict inode as soon as it is not used anymore. * * I_SYNC_QUEUED Inode is queued in b_io or b_more_io writeback lists. * Used to detect that mark_inode_dirty() should not move * inode between dirty lists. * * I_PINNING_FSCACHE_WB Inode is pinning an fscache object for writeback. * * I_LRU_ISOLATING Inode is pinned being isolated from LRU without holding * i_count. * * Q: What is the difference between I_WILL_FREE and I_FREEING? * * __I_{SYNC,NEW,LRU_ISOLATING} are used to derive unique addresses to wait * upon. There's one free address left. */
enum inode_state_bits { __I_NEW = 0U, __I_SYNC = 1U, __I_LRU_ISOLATING = 2U /* reserved wait address bit 3 */};
enum inode_state_flags_enum { I_NEW = (1U << __I_NEW), I_SYNC = (1U << __I_SYNC), I_LRU_ISOLATING = (1U << __I_LRU_ISOLATING), /* reserved flag bit 3 */ I_DIRTY_SYNC = (1U << 4), I_DIRTY_DATASYNC = (1U << 5), I_DIRTY_PAGES = (1U << 6), I_WILL_FREE = (1U << 7), I_FREEING = (1U << 8), I_CLEAR = (1U << 9), I_REFERENCED = (1U << 10), I_LINKABLE = (1U << 11), I_DIRTY_TIME = (1U << 12), I_WB_SWITCH = (1U << 13), I_OVL_INUSE = (1U << 14), I_CREATING = (1U << 15), I_DONTCACHE = (1U << 16), I_SYNC_QUEUED = (1U << 17), I_PINNING_NETFS_WB = (1U << 18), I_METADATA_WRITEBACK = (1U << 19),};
#define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)#define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)#define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
/* * Use inode_state_read() & friends to access. */struct inode_state_flags { enum inode_state_flags_enum __state;};
/* * 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; unsigned int i_flags;#ifdef CONFIG_FS_POSIX_ACL struct posix_acl *i_acl; struct posix_acl *i_default_acl;#endif kuid_t i_uid; kgid_t i_gid;
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 */ u64 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; time64_t i_atime_sec; time64_t i_mtime_sec; time64_t i_ctime_sec; u32 i_atime_nsec; u32 i_mtime_nsec; u32 i_ctime_nsec; u32 i_generation; spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ unsigned short i_bytes; u8 i_blkbits; enum rw_hint i_write_hint; blkcnt_t i_blocks;
#ifdef __NEED_I_SIZE_ORDERED seqcount_t i_size_seqcount;#endif
/* Misc */ struct inode_state_flags i_state; /* 32-bit hole */ struct rw_semaphore i_rwsem;
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; struct list_head i_wb_list; /* backing dev writeback list */ union { struct hlist_head i_dentry; struct rcu_head i_rcu; }; atomic64_t i_version; atomic64_t i_sequence; /* see futex */ atomic_t i_count; atomic_t i_dio_count; atomic_t i_writecount;#if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING) atomic_t i_readcount; /* struct files open RO */#endif union { const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ void (*free_inode)(struct inode *); }; struct file_lock_context *i_flctx; struct address_space i_data; union { struct list_head i_devices; int i_linklen; }; union { struct pipe_inode_info *i_pipe; struct cdev *i_cdev; char *i_link; unsigned i_dir_seq; };
#ifdef CONFIG_FSNOTIFY __u32 i_fsnotify_mask; /* all events this inode cares about */ /* 32-bit hole reserved for expanding i_fsnotify_mask */ struct fsnotify_mark_connector __rcu *i_fsnotify_marks;#endif
void *i_private; /* fs or device private pointer */} __randomize_layout;
/* * i_state handling * * We hide all of it behind helpers so that we can validate consumers. */static inline enum inode_state_flags_enum inode_state_read_once(struct inode *inode){ return READ_ONCE(inode->i_state.__state);}
static inline enum inode_state_flags_enum inode_state_read(struct inode *inode){ lockdep_assert_held(&inode->i_lock); return inode->i_state.__state;}
static inline void inode_state_set_raw(struct inode *inode, enum inode_state_flags_enum flags){ WRITE_ONCE(inode->i_state.__state, inode->i_state.__state | flags);}
static inline void inode_state_set(struct inode *inode, enum inode_state_flags_enum flags){ lockdep_assert_held(&inode->i_lock); inode_state_set_raw(inode, flags);}
static inline void inode_state_clear_raw(struct inode *inode, enum inode_state_flags_enum flags){ WRITE_ONCE(inode->i_state.__state, inode->i_state.__state & ~flags);}
static inline void inode_state_clear(struct inode *inode, enum inode_state_flags_enum flags){ lockdep_assert_held(&inode->i_lock); inode_state_clear_raw(inode, flags);}
static inline void inode_state_assign_raw(struct inode *inode, enum inode_state_flags_enum flags){ WRITE_ONCE(inode->i_state.__state, flags);}
static inline void inode_state_assign(struct inode *inode, enum inode_state_flags_enum flags){ lockdep_assert_held(&inode->i_lock); inode_state_assign_raw(inode, flags);}
static inline void inode_state_replace_raw(struct inode *inode, enum inode_state_flags_enum clearflags, enum inode_state_flags_enum setflags){ enum inode_state_flags_enum flags; flags = inode->i_state.__state; flags &= ~clearflags; flags |= setflags; inode_state_assign_raw(inode, flags);}
static inline void inode_state_replace(struct inode *inode, enum inode_state_flags_enum clearflags, enum inode_state_flags_enum setflags){ lockdep_assert_held(&inode->i_lock); inode_state_replace_raw(inode, clearflags, setflags);}
static inline void inode_set_cached_link(struct inode *inode, char *link, int linklen){ VFS_WARN_ON_INODE(strlen(link) != linklen, inode); VFS_WARN_ON_INODE(inode->i_opflags & IOP_CACHED_LINK, inode); inode->i_link = link; inode->i_linklen = linklen; inode->i_opflags |= IOP_CACHED_LINK;}
/* * Get bit address from inode->i_state to use with wait_var_event() * infrastructre. */#define inode_state_wait_address(inode, bit) ((char *)&(inode)->i_state + (bit))
struct wait_queue_head *inode_bit_waitqueue(struct wait_bit_queue_entry *wqe, struct inode *inode, u32 bit);
static inline void inode_wake_up_bit(struct inode *inode, u32 bit){ /* Caller is responsible for correct memory barriers. */ wake_up_var(inode_state_wait_address(inode, bit));}
struct timespec64 timestamp_truncate(struct timespec64 t, struct inode *inode);
static inline unsigned int i_blocksize(const struct inode *node){ return (1 << node->i_blkbits);}
static inline int inode_unhashed(struct inode *inode){ return hlist_unhashed(&inode->i_hash);}
/* * __mark_inode_dirty expects inodes to be hashed. Since we don't * want special inodes in the fileset inode space, we make them * appear hashed, but do not put on any lists. hlist_del() * will work fine and require no locking. */static inline void inode_fake_hash(struct inode *inode){ hlist_add_fake(&inode->i_hash);}
void wait_on_new_inode(struct inode *inode);
/* * inode->i_rwsem 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,};
static inline void inode_lock(struct inode *inode){ down_write(&inode->i_rwsem);}
static inline __must_check int inode_lock_killable(struct inode *inode){ return down_write_killable(&inode->i_rwsem);}
static inline void inode_unlock(struct inode *inode){ up_write(&inode->i_rwsem);}
static inline void inode_lock_shared(struct inode *inode){ down_read(&inode->i_rwsem);}
static inline __must_check int inode_lock_shared_killable(struct inode *inode){ return down_read_killable(&inode->i_rwsem);}
static inline void inode_unlock_shared(struct inode *inode){ up_read(&inode->i_rwsem);}
static inline int inode_trylock(struct inode *inode){ return down_write_trylock(&inode->i_rwsem);}
static inline int inode_trylock_shared(struct inode *inode){ return down_read_trylock(&inode->i_rwsem);}
static inline int inode_is_locked(struct inode *inode){ return rwsem_is_locked(&inode->i_rwsem);}
static inline void inode_lock_nested(struct inode *inode, unsigned subclass){ down_write_nested(&inode->i_rwsem, subclass);}
static inline void inode_lock_shared_nested(struct inode *inode, unsigned subclass){ down_read_nested(&inode->i_rwsem, subclass);}
static inline void filemap_invalidate_lock(struct address_space *mapping){ down_write(&mapping->invalidate_lock);}
static inline void filemap_invalidate_unlock(struct address_space *mapping){ up_write(&mapping->invalidate_lock);}
static inline void filemap_invalidate_lock_shared(struct address_space *mapping){ down_read(&mapping->invalidate_lock);}
static inline int filemap_invalidate_trylock_shared( struct address_space *mapping){ return down_read_trylock(&mapping->invalidate_lock);}
static inline void filemap_invalidate_unlock_shared( struct address_space *mapping){ up_read(&mapping->invalidate_lock);}
void lock_two_nondirectories(struct inode *, struct inode*);void unlock_two_nondirectories(struct inode *, struct inode*);
void filemap_invalidate_lock_two(struct address_space *mapping1, struct address_space *mapping2);void filemap_invalidate_unlock_two(struct address_space *mapping1, struct address_space *mapping2);
/* * 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_PREEMPTION) loff_t i_size;
preempt_disable(); i_size = inode->i_size; preempt_enable(); return i_size;#else /* Pairs with smp_store_release() in i_size_write() */ return smp_load_acquire(&inode->i_size);#endif}
/* * NOTE: unlike i_size_read(), i_size_write() does need locking around it * (normally i_rwsem), 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_PREEMPTION) preempt_disable(); inode->i_size = i_size; preempt_enable();#else /* * Pairs with smp_load_acquire() in i_size_read() to ensure * changes related to inode size (such as page contents) are * visible before we see the changed inode size. */ smp_store_release(&inode->i_size, i_size);#endif}
static inline unsigned iminor(const struct inode *inode){ return MINOR(inode->i_rdev);}
static inline unsigned imajor(const struct inode *inode){ return MAJOR(inode->i_rdev);}
struct fown_struct { struct file *file; /* backpointer for security modules */ 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 */};
/** * struct file_ra_state - Track a file's readahead state. * @start: Where the most recent readahead started. * @size: Number of pages read in the most recent readahead. * @async_size: Numer of pages that were/are not needed immediately * and so were/are genuinely "ahead". Start next readahead when * the first of these pages is accessed. * @ra_pages: Maximum size of a readahead request, copied from the bdi. * @order: Preferred folio order used for most recent readahead. * @mmap_miss: How many mmap accesses missed in the page cache. * @prev_pos: The last byte in the most recent read request. * * When this structure is passed to ->readahead(), the "most recent" * readahead means the current readahead. */struct file_ra_state { pgoff_t start; unsigned int size; unsigned int async_size; unsigned int ra_pages; unsigned short order; unsigned short mmap_miss; loff_t prev_pos;};
/* * 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 - Represents a file * @f_lock: Protects f_ep, f_flags. Must not be taken from IRQ context. * @f_mode: FMODE_* flags often used in hotpaths * @f_op: file operations * @f_mapping: Contents of a cacheable, mappable object. * @private_data: filesystem or driver specific data * @f_inode: cached inode * @f_flags: file flags * @f_iocb_flags: iocb flags * @f_cred: stashed credentials of creator/opener * @f_owner: file owner * @f_path: path of the file * @__f_path: writable alias for @f_path; *ONLY* for core VFS and only before * the file gets open * @f_pos_lock: lock protecting file position * @f_pipe: specific to pipes * @f_pos: file position * @f_security: LSM security context of this file * @f_wb_err: writeback error * @f_sb_err: per sb writeback errors * @f_ep: link of all epoll hooks for this file * @f_task_work: task work entry point * @f_llist: work queue entrypoint * @f_ra: file's readahead state * @f_freeptr: Pointer used by SLAB_TYPESAFE_BY_RCU file cache (don't touch.) * @f_ref: reference count */struct file { spinlock_t f_lock; fmode_t f_mode; const struct file_operations *f_op; struct address_space *f_mapping; void *private_data; struct inode *f_inode; unsigned int f_flags; unsigned int f_iocb_flags; const struct cred *f_cred; struct fown_struct *f_owner; /* --- cacheline 1 boundary (64 bytes) --- */ union { const struct path f_path; struct path __f_path; }; union { /* regular files (with FMODE_ATOMIC_POS) and directories */ struct mutex f_pos_lock; /* pipes */ u64 f_pipe; }; loff_t f_pos;#ifdef CONFIG_SECURITY void *f_security;#endif /* --- cacheline 2 boundary (128 bytes) --- */ errseq_t f_wb_err; errseq_t f_sb_err;#ifdef CONFIG_EPOLL struct hlist_head *f_ep;#endif union { struct callback_head f_task_work; struct llist_node f_llist; struct file_ra_state f_ra; freeptr_t f_freeptr; }; file_ref_t f_ref; /* --- cacheline 3 boundary (192 bytes) --- */} __randomize_layout __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[] __counted_by(handle_bytes);};
static inline struct file *get_file(struct file *f){ file_ref_inc(&f->f_ref); return f;}
struct file *get_file_rcu(struct file __rcu **f);struct file *get_file_active(struct file **f);
#define file_count(f) file_ref_read(&(f)->f_ref)
#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)ULONG_MAX << PAGE_SHIFT)#elif BITS_PER_LONG==64#define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX)#endif
/* legacy typedef, should eventually be removed */typedef void *fl_owner_t;
struct file_lock;struct file_lease;
/* The following constant reflects the upper bound of the file/locking space */#ifndef OFFSET_MAX#define OFFSET_MAX type_max(loff_t)#define OFFT_OFFSET_MAX type_max(off_t)#endif
int file_f_owner_allocate(struct file *file);static inline struct fown_struct *file_f_owner(const struct file *file){ return READ_ONCE(file->f_owner);}
extern void send_sigio(struct fown_struct *fown, int fd, int band);
static inline struct inode *file_inode(const struct file *f){ return f->f_inode;}
/* * file_dentry() is a relic from the days that overlayfs was using files with a * "fake" path, meaning, f_path on overlayfs and f_inode on underlying fs. * In those days, file_dentry() was needed to get the underlying fs dentry that * matches f_inode. * Files with "fake" path should not exist nowadays, so use an assertion to make * sure that file_dentry() was not papering over filesystem bugs. */static inline struct dentry *file_dentry(const struct file *file){ struct dentry *dentry = file->f_path.dentry;
WARN_ON_ONCE(d_inode(dentry) != file_inode(file)); return dentry;}
struct fasync_struct { rwlock_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 int f_setown(struct file *filp, int who, int force);extern void f_delown(struct file *filp);extern pid_t f_getown(struct file *filp);extern int send_sigurg(struct file *file);
/* * 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 */
static inline struct user_namespace *i_user_ns(const struct inode *inode){ return inode->i_sb->s_user_ns;}
/* 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(i_user_ns(inode), inode->i_uid);}
static inline gid_t i_gid_read(const struct inode *inode){ return from_kgid(i_user_ns(inode), inode->i_gid);}
static inline void i_uid_write(struct inode *inode, uid_t uid){ inode->i_uid = make_kuid(i_user_ns(inode), uid);}
static inline void i_gid_write(struct inode *inode, gid_t gid){ inode->i_gid = make_kgid(i_user_ns(inode), gid);}
/** * i_uid_into_vfsuid - map an inode's i_uid down according to an idmapping * @idmap: idmap of the mount the inode was found from * @inode: inode to map * * Return: whe inode's i_uid mapped down according to @idmap. * If the inode's i_uid has no mapping INVALID_VFSUID is returned. */static inline vfsuid_t i_uid_into_vfsuid(struct mnt_idmap *idmap, const struct inode *inode){ return make_vfsuid(idmap, i_user_ns(inode), inode->i_uid);}
/** * i_uid_needs_update - check whether inode's i_uid needs to be updated * @idmap: idmap of the mount the inode was found from * @attr: the new attributes of @inode * @inode: the inode to update * * Check whether the $inode's i_uid field needs to be updated taking idmapped * mounts into account if the filesystem supports it. * * Return: true if @inode's i_uid field needs to be updated, false if not. */static inline bool i_uid_needs_update(struct mnt_idmap *idmap, const struct iattr *attr, const struct inode *inode){ return ((attr->ia_valid & ATTR_UID) && !vfsuid_eq(attr->ia_vfsuid, i_uid_into_vfsuid(idmap, inode)));}
/** * i_uid_update - update @inode's i_uid field * @idmap: idmap of the mount the inode was found from * @attr: the new attributes of @inode * @inode: the inode to update * * Safely update @inode's i_uid field translating the vfsuid of any idmapped * mount into the filesystem kuid. */static inline void i_uid_update(struct mnt_idmap *idmap, const struct iattr *attr, struct inode *inode){ if (attr->ia_valid & ATTR_UID) inode->i_uid = from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid);}
/** * i_gid_into_vfsgid - map an inode's i_gid down according to an idmapping * @idmap: idmap of the mount the inode was found from * @inode: inode to map * * Return: the inode's i_gid mapped down according to @idmap. * If the inode's i_gid has no mapping INVALID_VFSGID is returned. */static inline vfsgid_t i_gid_into_vfsgid(struct mnt_idmap *idmap, const struct inode *inode){ return make_vfsgid(idmap, i_user_ns(inode), inode->i_gid);}
/** * i_gid_needs_update - check whether inode's i_gid needs to be updated * @idmap: idmap of the mount the inode was found from * @attr: the new attributes of @inode * @inode: the inode to update * * Check whether the $inode's i_gid field needs to be updated taking idmapped * mounts into account if the filesystem supports it. * * Return: true if @inode's i_gid field needs to be updated, false if not. */static inline bool i_gid_needs_update(struct mnt_idmap *idmap, const struct iattr *attr, const struct inode *inode){ return ((attr->ia_valid & ATTR_GID) && !vfsgid_eq(attr->ia_vfsgid, i_gid_into_vfsgid(idmap, inode)));}
/** * i_gid_update - update @inode's i_gid field * @idmap: idmap of the mount the inode was found from * @attr: the new attributes of @inode * @inode: the inode to update * * Safely update @inode's i_gid field translating the vfsgid of any idmapped * mount into the filesystem kgid. */static inline void i_gid_update(struct mnt_idmap *idmap, const struct iattr *attr, struct inode *inode){ if (attr->ia_valid & ATTR_GID) inode->i_gid = from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid);}
/** * inode_fsuid_set - initialize inode's i_uid field with callers fsuid * @inode: inode to initialize * @idmap: idmap of the mount the inode was found from * * Initialize the i_uid field of @inode. If the inode was found/created via * an idmapped mount map the caller's fsuid according to @idmap. */static inline void inode_fsuid_set(struct inode *inode, struct mnt_idmap *idmap){ inode->i_uid = mapped_fsuid(idmap, i_user_ns(inode));}
/** * inode_fsgid_set - initialize inode's i_gid field with callers fsgid * @inode: inode to initialize * @idmap: idmap of the mount the inode was found from * * Initialize the i_gid field of @inode. If the inode was found/created via * an idmapped mount map the caller's fsgid according to @idmap. */static inline void inode_fsgid_set(struct inode *inode, struct mnt_idmap *idmap){ inode->i_gid = mapped_fsgid(idmap, i_user_ns(inode));}
/** * fsuidgid_has_mapping() - check whether caller's fsuid/fsgid is mapped * @sb: the superblock we want a mapping in * @idmap: idmap of the relevant mount * * Check whether the caller's fsuid and fsgid have a valid mapping in the * s_user_ns of the superblock @sb. If the caller is on an idmapped mount map * the caller's fsuid and fsgid according to the @idmap first. * * Return: true if fsuid and fsgid is mapped, false if not. */static inline bool fsuidgid_has_mapping(struct super_block *sb, struct mnt_idmap *idmap){ struct user_namespace *fs_userns = sb->s_user_ns; kuid_t kuid; kgid_t kgid;
kuid = mapped_fsuid(idmap, fs_userns); if (!uid_valid(kuid)) return false; kgid = mapped_fsgid(idmap, fs_userns); if (!gid_valid(kgid)) return false; return kuid_has_mapping(fs_userns, kuid) && kgid_has_mapping(fs_userns, kgid);}
struct timespec64 current_time(struct inode *inode);struct timespec64 inode_set_ctime_current(struct inode *inode);struct timespec64 inode_set_ctime_deleg(struct inode *inode, struct timespec64 update);
static inline time64_t inode_get_atime_sec(const struct inode *inode){ return READ_ONCE(inode->i_atime_sec);}
static inline long inode_get_atime_nsec(const struct inode *inode){ return READ_ONCE(inode->i_atime_nsec);}
static inline struct timespec64 inode_get_atime(const struct inode *inode){ struct timespec64 ts = { .tv_sec = inode_get_atime_sec(inode), .tv_nsec = inode_get_atime_nsec(inode) };
return ts;}
static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode, struct timespec64 ts){ WRITE_ONCE(inode->i_atime_sec, ts.tv_sec); WRITE_ONCE(inode->i_atime_nsec, ts.tv_nsec); return ts;}
static inline struct timespec64 inode_set_atime(struct inode *inode, time64_t sec, long nsec){ struct timespec64 ts = { .tv_sec = sec, .tv_nsec = nsec };
return inode_set_atime_to_ts(inode, ts);}
static inline time64_t inode_get_mtime_sec(const struct inode *inode){ return READ_ONCE(inode->i_mtime_sec);}
static inline long inode_get_mtime_nsec(const struct inode *inode){ return READ_ONCE(inode->i_mtime_nsec);}
static inline struct timespec64 inode_get_mtime(const struct inode *inode){ struct timespec64 ts = { .tv_sec = inode_get_mtime_sec(inode), .tv_nsec = inode_get_mtime_nsec(inode) }; return ts;}
static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode, struct timespec64 ts){ WRITE_ONCE(inode->i_mtime_sec, ts.tv_sec); WRITE_ONCE(inode->i_mtime_nsec, ts.tv_nsec); return ts;}
static inline struct timespec64 inode_set_mtime(struct inode *inode, time64_t sec, long nsec){ struct timespec64 ts = { .tv_sec = sec, .tv_nsec = nsec }; return inode_set_mtime_to_ts(inode, ts);}
/* * Multigrain timestamps * * Conditionally use fine-grained ctime and mtime timestamps when there * are users actively observing them via getattr. The primary use-case * for this is NFS clients that use the ctime to distinguish between * different states of the file, and that are often fooled by multiple * operations that occur in the same coarse-grained timer tick. */#define I_CTIME_QUERIED ((u32)BIT(31))
static inline time64_t inode_get_ctime_sec(const struct inode *inode){ return READ_ONCE(inode->i_ctime_sec);}
static inline long inode_get_ctime_nsec(const struct inode *inode){ return READ_ONCE(inode->i_ctime_nsec) & ~I_CTIME_QUERIED;}
static inline struct timespec64 inode_get_ctime(const struct inode *inode){ struct timespec64 ts = { .tv_sec = inode_get_ctime_sec(inode), .tv_nsec = inode_get_ctime_nsec(inode) };
return ts;}
struct timespec64 inode_set_ctime_to_ts(struct inode *inode, struct timespec64 ts);
/** * inode_set_ctime - set the ctime in the inode * @inode: inode in which to set the ctime * @sec: tv_sec value to set * @nsec: tv_nsec value to set * * Set the ctime in @inode to { @sec, @nsec } */static inline struct timespec64 inode_set_ctime(struct inode *inode, time64_t sec, long nsec){ struct timespec64 ts = { .tv_sec = sec, .tv_nsec = nsec };
return inode_set_ctime_to_ts(inode, ts);}
struct timespec64 simple_inode_init_ts(struct inode *inode);
static inline int inode_time_dirty_flag(struct inode *inode){ if (inode->i_sb->s_flags & SB_LAZYTIME) return I_DIRTY_TIME; return I_DIRTY_SYNC;}
/* * Snapshotting support. */
/** * file_write_started - check if SB_FREEZE_WRITE is held * @file: the file we write to * * May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN. * May be false positive with !S_ISREG, because file_start_write() has * no effect on !S_ISREG. */static inline bool file_write_started(const struct file *file){ if (!S_ISREG(file_inode(file)->i_mode)) return true; return sb_write_started(file_inode(file)->i_sb);}
/** * file_write_not_started - check if SB_FREEZE_WRITE is not held * @file: the file we write to * * May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN. * May be false positive with !S_ISREG, because file_start_write() has * no effect on !S_ISREG. */static inline bool file_write_not_started(const struct file *file){ if (!S_ISREG(file_inode(file)->i_mode)) return true; return sb_write_not_started(file_inode(file)->i_sb);}
bool inode_owner_or_capable(struct mnt_idmap *idmap, const struct inode *inode);
/* * VFS helper functions.. */int vfs_create(struct mnt_idmap *, struct dentry *, umode_t, struct delegated_inode *);struct dentry *vfs_mkdir(struct mnt_idmap *, struct inode *, struct dentry *, umode_t, struct delegated_inode *);int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *, umode_t, dev_t, struct delegated_inode *);int vfs_symlink(struct mnt_idmap *, struct inode *, struct dentry *, const char *, struct delegated_inode *);int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *, struct dentry *, struct delegated_inode *);int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *, struct delegated_inode *);int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *, struct delegated_inode *);
/** * struct renamedata - contains all information required for renaming * @mnt_idmap: idmap of the mount in which the rename is happening. * @old_parent: parent of source * @old_dentry: source * @new_parent: parent of destination * @new_dentry: destination * @delegated_inode: returns an inode needing a delegation break * @flags: rename flags */struct renamedata { struct mnt_idmap *mnt_idmap; struct dentry *old_parent; struct dentry *old_dentry; struct dentry *new_parent; struct dentry *new_dentry; struct delegated_inode *delegated_inode; unsigned int flags;} __randomize_layout;
int vfs_rename(struct renamedata *);
static inline int vfs_whiteout(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry){ return vfs_mknod(idmap, dir, dentry, S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV, NULL);}
struct file *kernel_tmpfile_open(struct mnt_idmap *idmap, const struct path *parentpath, umode_t mode, int open_flag, const struct cred *cred);struct file *kernel_file_open(const struct path *path, int flags, const struct cred *cred);
int vfs_mkobj(struct dentry *, umode_t, int (*f)(struct dentry *, umode_t, void *), void *);
int vfs_fchown(struct file *file, uid_t user, gid_t group);int vfs_fchmod(struct file *file, umode_t mode);int vfs_utimes(const struct path *path, struct timespec64 *times);
#ifdef CONFIG_COMPATextern long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg);#else#define compat_ptr_ioctl NULL#endif
/* * VFS file helper functions. */void inode_init_owner(struct mnt_idmap *idmap, struct inode *inode, const struct inode *dir, umode_t mode);extern bool may_open_dev(const struct path *path);umode_t mode_strip_sgid(struct mnt_idmap *idmap, const struct inode *dir, umode_t mode);bool in_group_or_capable(struct mnt_idmap *idmap, const struct inode *inode, vfsgid_t vfsgid);
/* * 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. * Return 'true' to keep going and 'false' if there are no more entries. */struct dir_context;typedef bool (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, unsigned);
struct dir_context { filldir_t actor; loff_t pos; /* * Filesystems MUST NOT MODIFY count, but may use as a hint: * 0 unknown * > 0 space in buffer (assume at least one entry) * INT_MAX unlimited */ int count; /* @actor supports these flags in d_type high bits */ unsigned int dt_flags_mask;};
/* If OR-ed with d_type, pending signals are not checked */#define FILLDIR_FLAG_NOINTR 0x1000
/* * 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)
/* * These flags control the behavior of the remap_file_range function pointer. * If it is called with len == 0 that means "remap to end of source file". * See Documentation/filesystems/vfs.rst for more details about this call. * * REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate) * REMAP_FILE_CAN_SHORTEN: caller can handle a shortened request */#define REMAP_FILE_DEDUP (1 << 0)#define REMAP_FILE_CAN_SHORTEN (1 << 1)
/* * These flags signal that the caller is ok with altering various aspects of * the behavior of the remap operation. The changes must be made by the * implementation; the vfs remap helper functions can take advantage of them. * Flags in this category exist to preserve the quirky behavior of the hoisted * btrfs clone/dedupe ioctls. */#define REMAP_FILE_ADVISORY (REMAP_FILE_CAN_SHORTEN)
/* * These flags control the behavior of vfs_copy_file_range(). * They are not available to the user via syscall. * * COPY_FILE_SPLICE: call splice direct instead of fs clone/copy ops */#define COPY_FILE_SPLICE (1 << 0)
struct io_uring_cmd;struct offset_ctx;
struct file_operations { struct module *owner; fop_flags_t fop_flags; 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 (*iopoll)(struct kiocb *kiocb, struct io_comp_batch *, unsigned int flags); int (*iterate_shared) (struct file *, struct dir_context *); __poll_t (*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 (*fasync) (int, struct file *, int); int (*lock) (struct file *, int, struct file_lock *); 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); void (*splice_eof)(struct file *file); int (*setlease)(struct file *, int, struct file_lease **, 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 ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, loff_t, size_t, unsigned int); loff_t (*remap_file_range)(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t len, unsigned int remap_flags); int (*fadvise)(struct file *, loff_t, loff_t, int); int (*uring_cmd)(struct io_uring_cmd *ioucmd, unsigned int issue_flags); int (*uring_cmd_iopoll)(struct io_uring_cmd *, struct io_comp_batch *, unsigned int poll_flags); int (*mmap_prepare)(struct vm_area_desc *);} __randomize_layout;
/* Supports async buffered reads */#define FOP_BUFFER_RASYNC ((__force fop_flags_t)(1 << 0))/* Supports async buffered writes */#define FOP_BUFFER_WASYNC ((__force fop_flags_t)(1 << 1))/* Supports synchronous page faults for mappings */#define FOP_MMAP_SYNC ((__force fop_flags_t)(1 << 2))/* Supports non-exclusive O_DIRECT writes from multiple threads */#define FOP_DIO_PARALLEL_WRITE ((__force fop_flags_t)(1 << 3))/* Contains huge pages */#define FOP_HUGE_PAGES ((__force fop_flags_t)(1 << 4))/* Treat loff_t as unsigned (e.g., /dev/mem) */#define FOP_UNSIGNED_OFFSET ((__force fop_flags_t)(1 << 5))/* Supports asynchronous lock callbacks */#define FOP_ASYNC_LOCK ((__force fop_flags_t)(1 << 6))/* File system supports uncached read/write buffered IO */#define FOP_DONTCACHE ((__force fop_flags_t)(1 << 7))/* Never changes and is never removed, readdir of a directory takes no lock */#define FOP_IMMUTABLE ((__force fop_flags_t)(1 << 8))
/* Wrap a directory iterator that needs exclusive inode access */int wrap_directory_iterator(struct file *, struct dir_context *, int (*) (struct file *, struct dir_context *));#define WRAP_DIR_ITER(x) \ static int shared_##x(struct file *file , struct dir_context *ctx) \ { return wrap_directory_iterator(file, ctx, x); }
enum fs_update_time { FS_UPD_ATIME, FS_UPD_CMTIME,};
struct inode_operations { struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); int (*permission) (struct mnt_idmap *, struct inode *, int); struct posix_acl * (*get_inode_acl)(struct inode *, int, bool);
int (*readlink) (struct dentry *, char __user *,int);
int (*create) (struct mnt_idmap *, struct inode *,struct dentry *, umode_t); int (*link) (struct dentry *,struct inode *,struct dentry *); int (*unlink) (struct inode *,struct dentry *); int (*symlink) (struct mnt_idmap *, struct inode *,struct dentry *, const char *); struct dentry *(*mkdir) (struct mnt_idmap *, struct inode *, struct dentry *, umode_t); int (*rmdir) (struct inode *,struct dentry *); int (*mknod) (struct mnt_idmap *, struct inode *,struct dentry *, umode_t,dev_t); int (*rename) (struct mnt_idmap *, struct inode *, struct dentry *, struct inode *, struct dentry *, unsigned int); int (*setattr) (struct mnt_idmap *, struct dentry *, struct iattr *); int (*getattr) (struct mnt_idmap *, const struct path *, struct kstat *, u32, unsigned int); ssize_t (*listxattr) (struct dentry *, char *, size_t); int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, u64 len); int (*update_time)(struct inode *inode, enum fs_update_time type, unsigned int flags); void (*sync_lazytime)(struct inode *inode); int (*atomic_open)(struct inode *, struct dentry *, struct file *, unsigned open_flag, umode_t create_mode); int (*tmpfile) (struct mnt_idmap *, struct inode *, struct file *, umode_t); struct posix_acl *(*get_acl)(struct mnt_idmap *, struct dentry *, int); int (*set_acl)(struct mnt_idmap *, struct dentry *, struct posix_acl *, int); int (*fileattr_set)(struct mnt_idmap *idmap, struct dentry *dentry, struct file_kattr *fa); int (*fileattr_get)(struct dentry *dentry, struct file_kattr *fa); struct offset_ctx *(*get_offset_ctx)(struct inode *inode);} ____cacheline_aligned;
/* Did the driver provide valid mmap hook configuration? */static inline bool can_mmap_file(struct file *file){ bool has_mmap = file->f_op->mmap; bool has_mmap_prepare = file->f_op->mmap_prepare;
/* Hooks are mutually exclusive. */ if (WARN_ON_ONCE(has_mmap && has_mmap_prepare)) return false; if (!has_mmap && !has_mmap_prepare) return false;
return true;}
void compat_set_desc_from_vma(struct vm_area_desc *desc, const struct file *file, const struct vm_area_struct *vma);int __compat_vma_mmap(struct vm_area_desc *desc, struct vm_area_struct *vma);int compat_vma_mmap(struct file *file, struct vm_area_struct *vma);
static inline int vfs_mmap(struct file *file, struct vm_area_struct *vma){ if (file->f_op->mmap_prepare) return compat_vma_mmap(file, vma);
return file->f_op->mmap(file, vma);}
static inline int vfs_mmap_prepare(struct file *file, struct vm_area_desc *desc){ return file->f_op->mmap_prepare(desc);}
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_copy_file_range(struct file *, loff_t , struct file *, loff_t, size_t, unsigned int);int remap_verify_area(struct file *file, loff_t pos, loff_t len, bool write);int __generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t *len, unsigned int remap_flags, const struct iomap_ops *dax_read_ops);int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t *count, unsigned int remap_flags);extern loff_t vfs_clone_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t len, unsigned int remap_flags);extern int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same);extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos, struct file *dst_file, loff_t dst_pos, loff_t len, unsigned int remap_flags);
/* * Inode flags - they have no relation to superblock flags now */#define S_SYNC (1 << 0) /* Writes are synced at once */#define S_NOATIME (1 << 1) /* Do not update access times */#define S_APPEND (1 << 2) /* Append-only file */#define S_IMMUTABLE (1 << 3) /* Immutable file */#define S_DEAD (1 << 4) /* removed, but still open directory */#define S_NOQUOTA (1 << 5) /* Inode is not counted to quota */#define S_DIRSYNC (1 << 6) /* Directory modifications are synchronous */#define S_NOCMTIME (1 << 7) /* Do not update file c/mtime */#define S_SWAPFILE (1 << 8) /* Do not truncate: swapon got its bmaps */#define S_PRIVATE (1 << 9) /* Inode is fs-internal */#define S_IMA (1 << 10) /* Inode has an associated IMA struct */#define S_AUTOMOUNT (1 << 11) /* Automount/referral quasi-directory */#define S_NOSEC (1 << 12) /* no suid or xattr security attributes */#ifdef CONFIG_FS_DAX#define S_DAX (1 << 13) /* Direct Access, avoiding the page cache */#else#define S_DAX 0 /* Make all the DAX code disappear */#endif#define S_ENCRYPTED (1 << 14) /* Encrypted file (using fs/crypto/) */#define S_CASEFOLD (1 << 15) /* Casefolded file */#define S_VERITY (1 << 16) /* Verity file (using fs/verity/) */#define S_KERNEL_FILE (1 << 17) /* File is in use by the kernel (eg. fs/cachefiles) */#define S_ANON_INODE (1 << 19) /* Inode is an anonymous inode */
/* * 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: SB_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) sb_rdonly((inode)->i_sb)#define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \ ((inode)->i_flags & S_SYNC))#define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \ ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))#define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK)#define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME)#define IS_I_VERSION(inode) __IS_FLG(inode, SB_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)
#ifdef CONFIG_FS_POSIX_ACL#define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL)#else#define IS_POSIXACL(inode) 0#endif
#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
#ifdef CONFIG_SWAP#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)#else#define IS_SWAPFILE(inode) ((void)(inode), 0U)#endif
#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_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED)#define IS_CASEFOLDED(inode) ((inode)->i_flags & S_CASEFOLD)#define IS_VERITY(inode) ((inode)->i_flags & S_VERITY)
#define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ (inode)->i_rdev == WHITEOUT_DEV)#define IS_ANON_FILE(inode) ((inode)->i_flags & S_ANON_INODE)
static inline bool HAS_UNMAPPED_ID(struct mnt_idmap *idmap, struct inode *inode){ return !vfsuid_valid(i_uid_into_vfsuid(idmap, inode)) || !vfsgid_valid(i_gid_into_vfsgid(idmap, inode));}
static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp){ *kiocb = (struct kiocb) { .ki_filp = filp, .ki_flags = filp->f_iocb_flags, .ki_ioprio = get_current_ioprio(), };}
static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src, struct file *filp){ *kiocb = (struct kiocb) { .ki_filp = filp, .ki_flags = kiocb_src->ki_flags, .ki_ioprio = kiocb_src->ki_ioprio, .ki_pos = kiocb_src->ki_pos, };}
extern void __mark_inode_dirty(struct inode *, int);static inline void mark_inode_dirty(struct inode *inode){ __mark_inode_dirty(inode, I_DIRTY);}
static inline void mark_inode_dirty_sync(struct inode *inode){ __mark_inode_dirty(inode, I_DIRTY_SYNC);}
static inline void set_inode_metadata_writeback(struct inode *inode){ spin_lock(&inode->i_lock); inode_state_set(inode, I_METADATA_WRITEBACK); spin_unlock(&inode->i_lock);}
/* * returns the refcount on the inode. it can change arbitrarily. */static inline int icount_read_once(const struct inode *inode){ return atomic_read(&inode->i_count);}
/* * returns the refcount on the inode. The lock guarantees no 0->1 or 1->0 transitions * of the count are going to take place, otherwise it changes arbitrarily. */static inline int icount_read(const struct inode *inode){ lockdep_assert_held(&inode->i_lock); return atomic_read(&inode->i_count);}
/* * Returns true if the given inode itself only has dirty timestamps (its pages * may still be dirty) and isn't currently being allocated or freed. * Filesystems should call this if when writing an inode when lazytime is * enabled, they want to opportunistically write the timestamps of other inodes * located very nearby on-disk, e.g. in the same inode block. This returns true * if the given inode is in need of such an opportunistic update. Requires * i_lock, or at least later re-checking under i_lock. */static inline bool inode_is_dirtytime_only(struct inode *inode){ return (inode_state_read_once(inode) & (I_DIRTY_TIME | I_NEW | I_FREEING | I_WILL_FREE)) == I_DIRTY_TIME;}
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);}
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);}
extern int file_modified(struct file *file);int kiocb_modified(struct kiocb *iocb);
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_DISALLOW_NOTIFY_PERM 16 /* Disable fanotify permission events */#define FS_ALLOW_IDMAP 32 /* FS has been updated to handle vfs idmappings. */#define FS_MGTIME 64 /* FS uses multigrain timestamps */#define FS_LBS 128 /* FS supports LBS */#define FS_POWER_FREEZE 256 /* Always freeze on suspend/hibernate */#define FS_USERNS_MOUNT_RESTRICTED 512 /* Restrict mount in userns if not already visible */#define FS_USERNS_DELEGATABLE 1024 /* Can be mounted inside userns from outside */#define FS_DISALLOW_NOTIFY 2048 /* No fsnotify marks on its objects */#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ int (*init_fs_context)(struct fs_context *); const struct fs_parameter_spec *parameters; void (*kill_sb) (struct super_block *); struct module *owner; struct hlist_node list; 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 invalidate_lock_key; struct lock_class_key i_mutex_dir_key;};
#define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
/** * is_mgtime: is this inode using multigrain timestamps * @inode: inode to test for multigrain timestamps * * Return true if the inode uses multigrain timestamps, false otherwise. */static inline bool is_mgtime(const struct inode *inode){ return inode->i_opflags & IOP_MGTIME;}
extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);void retire_super(struct super_block *sb);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 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 set_anon_super_fc(struct super_block *s, struct fs_context *fc);int get_anon_bdev(dev_t *);void free_anon_bdev(dev_t);struct super_block *sget_fc(struct fs_context *fc, int (*test)(struct super_block *, struct fs_context *), int (*set)(struct super_block *, struct fs_context *));struct super_block *sget_dev(struct fs_context *fc, dev_t dev);
/* Alas, no aliases. Too much hassle with bringing module.h everywhere */#define fops_get(fops) ({ \ const struct file_operations *_fops = (fops); \ (((_fops) && try_module_get((_fops)->owner) ? (_fops) : NULL)); \})
#define fops_put(fops) ({ \ const struct file_operations *_fops = (fops); \ if (_fops) \ module_put((_fops)->owner); \})
/* * 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 int vfs_statfs(const struct path *, struct kstatfs *);extern int user_statfs(const char __user *, struct kstatfs *);extern int fd_statfs(int, struct kstatfs *);extern __printf(2, 3)int super_setup_bdi_name(struct super_block *sb, char *fmt, ...);extern int super_setup_bdi(struct super_block *sb);
static inline void super_set_uuid(struct super_block *sb, const u8 *uuid, unsigned len){ if (WARN_ON(len > sizeof(sb->s_uuid))) len = sizeof(sb->s_uuid); sb->s_uuid_len = len; memcpy(&sb->s_uuid, uuid, len);}
/* set sb sysfs name based on sb->s_bdev */static inline void super_set_sysfs_name_bdev(struct super_block *sb){ snprintf(sb->s_sysfs_name, sizeof(sb->s_sysfs_name), "%pg", sb->s_bdev);}
/* set sb sysfs name based on sb->s_uuid */static inline void super_set_sysfs_name_uuid(struct super_block *sb){ WARN_ON(sb->s_uuid_len != sizeof(sb->s_uuid)); snprintf(sb->s_sysfs_name, sizeof(sb->s_sysfs_name), "%pU", sb->s_uuid.b);}
/* set sb sysfs name based on sb->s_id */static inline void super_set_sysfs_name_id(struct super_block *sb){ strscpy(sb->s_sysfs_name, sb->s_id, sizeof(sb->s_sysfs_name));}
/* try to use something standard before you use this */__printf(2, 3)static inline void super_set_sysfs_name_generic(struct super_block *sb, const char *fmt, ...){ va_list args;
va_start(args, fmt); vsnprintf(sb->s_sysfs_name, sizeof(sb->s_sysfs_name), fmt, args); va_end(args);}
extern void ihold(struct inode * inode);extern void iput(struct inode *);void iput_not_last(struct inode *);
/** * iput_if_not_last - drop an inode reference only if it is not the last one * @inode: inode to put * * Returns true if the reference was dropped, false if this was the last * reference and the caller must arrange for final iput() in a safe context. */static inline bool __must_check iput_if_not_last(struct inode *inode){ VFS_BUG_ON_INODE(inode_state_read_once(inode) & (I_FREEING | I_CLEAR), inode); VFS_BUG_ON_INODE(icount_read_once(inode) < 1, inode); return atomic_add_unless(&inode->i_count, -1, 1);}
int inode_update_time(struct inode *inode, enum fs_update_time type, unsigned int flags);int generic_update_time(struct inode *inode, enum fs_update_time type, unsigned int flags);
/* /sys/fs */extern struct kobject *fs_kobj;
#define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
/* fs/open.c */struct audit_names;
struct __filename_head { const char *name; /* pointer to actual string */ int refcnt; struct audit_names *aname;};#define EMBEDDED_NAME_MAX (192 - sizeof(struct __filename_head))struct filename { struct __filename_head; const char iname[EMBEDDED_NAME_MAX];};static_assert(offsetof(struct filename, iname) % sizeof(long) == 0);static_assert(sizeof(struct filename) % 64 == 0);
static inline struct mnt_idmap *file_mnt_idmap(const struct file *file){ return mnt_idmap(file->f_path.mnt);}
static inline bool file_owner_or_capable(const struct file *file){ return inode_owner_or_capable(file_mnt_idmap(file), file_inode(file));}
/** * is_idmapped_mnt - check whether a mount is mapped * @mnt: the mount to check * * If @mnt has an non @nop_mnt_idmap attached to it then @mnt is mapped. * * Return: true if mount is mapped, false if not. */static inline bool is_idmapped_mnt(const struct vfsmount *mnt){ return mnt_idmap(mnt) != &nop_mnt_idmap;}
int vfs_truncate(const struct path *, loff_t);int do_truncate(struct mnt_idmap *, 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);int 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(const struct path *, const char *, int, umode_t);static inline struct file *file_open_root_mnt(struct vfsmount *mnt, const char *name, int flags, umode_t mode){ return file_open_root(&(struct path){.mnt = mnt, .dentry = mnt->mnt_root}, name, flags, mode);}struct file *dentry_open(const struct path *path, int flags, const struct cred *creds);struct file *dentry_open_nonotify(const struct path *path, int flags, const struct cred *cred);struct file *dentry_create(struct path *path, int flags, umode_t mode, const struct cred *cred);const struct path *backing_file_user_path(const struct file *f);
#ifdef CONFIG_SECURITYvoid *backing_file_security(const struct file *f);void backing_file_set_security(struct file *f, void *security);#elsestatic inline void *backing_file_security(const struct file *f){ return NULL;}static inline void backing_file_set_security(struct file *f, void *security){}#endif /* CONFIG_SECURITY */
/* * When mmapping a file on a stackable filesystem (e.g., overlayfs), the file * stored in ->vm_file is a backing file whose f_inode is on the underlying * filesystem. When the mapped file path and inode number are displayed to * user (e.g. via /proc/<pid>/maps), these helpers should be used to get the * path and inode number to display to the user, which is the path of the fd * that user has requested to map and the inode number that would be returned * by fstat() on that same fd. *//* Get the path to display in /proc/<pid>/maps */static inline const struct path *file_user_path(const struct file *f){ if (unlikely(f->f_mode & FMODE_BACKING)) return backing_file_user_path(f); return &f->f_path;}/* Get the inode whose inode number to display in /proc/<pid>/maps */static inline const struct inode *file_user_inode(const struct file *f){ if (unlikely(f->f_mode & FMODE_BACKING)) return d_inode(backing_file_user_path(f)->dentry); return file_inode(f);}
static inline struct file *file_clone_open(struct file *file){ return dentry_open(&file->f_path, file->f_flags, file->f_cred);}extern int filp_close(struct file *, fl_owner_t id);
extern struct filename *getname_flags(const char __user *, int);extern struct filename *getname_uflags(const char __user *, int);static inline struct filename *getname(const char __user *name){ return getname_flags(name, 0);}extern struct filename *getname_kernel(const char *);extern struct filename *__getname_maybe_null(const char __user *);static inline struct filename *getname_maybe_null(const char __user *name, int flags){ if (!(flags & AT_EMPTY_PATH)) return getname(name);
if (!name) return NULL; return __getname_maybe_null(name);}extern void putname(struct filename *name);DEFINE_FREE(putname, struct filename *, if (!IS_ERR_OR_NULL(_T)) putname(_T))
struct delayed_filename { struct filename *__incomplete_filename; // don't touch};#define INIT_DELAYED_FILENAME(ptr) \ ((void)(*(ptr) = (struct delayed_filename){}))int delayed_getname(struct delayed_filename *, const char __user *);int delayed_getname_uflags(struct delayed_filename *v, const char __user *, int);void dismiss_delayed_filename(struct delayed_filename *);int putname_to_delayed(struct delayed_filename *, struct filename *);struct filename *complete_getname(struct delayed_filename *);
DEFINE_CLASS(filename, struct filename *, putname(_T), getname(p), const char __user *p)EXTEND_CLASS(filename, _kernel, getname_kernel(p), const char *p)EXTEND_CLASS(filename, _flags, getname_flags(p, f), const char __user *p, unsigned int f)EXTEND_CLASS(filename, _uflags, getname_uflags(p, f), const char __user *p, unsigned int f)EXTEND_CLASS(filename, _maybe_null, getname_maybe_null(p, f), const char __user *p, unsigned int f)EXTEND_CLASS(filename, _complete_delayed, complete_getname(p), struct delayed_filename *p)
extern int finish_open(struct file *file, struct dentry *dentry, int (*open)(struct inode *, struct file *));extern int finish_no_open(struct file *file, struct dentry *dentry);
/* Helper for the simple case when original dentry is used */static inline int finish_open_simple(struct file *file, int error){ if (error) return error;
return finish_open(file, file->f_path.dentry, NULL);}
/* fs/dcache.c */extern void __init vfs_caches_init_early(void);extern void __init vfs_caches_init(void);
#define __getname() kmalloc(PATH_MAX, GFP_KERNEL)#define __putname(name) kfree(name)
void emergency_thaw_all(void);extern int sync_filesystem(struct super_block *);extern const struct file_operations def_blk_fops;extern const struct file_operations def_chr_fops;
/* fs/char_dev.c */#define CHRDEV_MAJOR_MAX 512/* Marks the bottom of the first segment of free char majors */#define CHRDEV_MAJOR_DYN_END 234/* Marks the top and bottom of the second segment of free char majors */#define CHRDEV_MAJOR_DYN_EXT_START 511#define CHRDEV_MAJOR_DYN_EXT_END 384
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);}
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 bool is_bad_inode(struct inode *);
extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, loff_t lend);extern int __must_check file_check_and_advance_wb_err(struct file *file);extern int __must_check file_write_and_wait_range(struct file *file, loff_t start, loff_t end);int filemap_flush_range(struct address_space *mapping, loff_t start, loff_t end);void filemap_dontcache_kick_writeback(struct address_space *mapping);
static inline int file_write_and_wait(struct file *file){ return file_write_and_wait_range(file, 0, LLONG_MAX);}
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);
extern int sync_file_range(struct file *file, loff_t offset, loff_t nbytes, unsigned int flags);
static inline bool iocb_is_dsync(const struct kiocb *iocb){ return (iocb->ki_flags & IOCB_DSYNC) || IS_SYNC(iocb->ki_filp->f_mapping->host);}
/* * Sync the bytes written if this was a synchronous write. Expect ki_pos * to already be updated for the write, and will return either the amount * of bytes passed in, or an error if syncing the file failed. */static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count){ if (iocb_is_dsync(iocb)) { int ret = vfs_fsync_range(iocb->ki_filp, iocb->ki_pos - count, iocb->ki_pos - 1, (iocb->ki_flags & IOCB_SYNC) ? 0 : 1); if (ret) return ret; } else if (iocb->ki_flags & IOCB_DONTCACHE) { filemap_dontcache_kick_writeback(iocb->ki_filp->f_mapping); }
return count;}
extern void emergency_sync(void);extern void emergency_remount(void);
#ifdef CONFIG_BLOCKextern int bmap(struct inode *inode, sector_t *block);#elsestatic inline int bmap(struct inode *inode, sector_t *block){ return -EINVAL;}#endif
int notify_change(struct mnt_idmap *, struct dentry *, struct iattr *, struct delegated_inode *);int inode_permission(struct mnt_idmap *, struct inode *, int);int generic_permission(struct mnt_idmap *, struct inode *, int);static inline int file_permission(struct file *file, int mask){ return inode_permission(file_mnt_idmap(file), file_inode(file), mask);}static inline int path_permission(const struct path *path, int mask){ return inode_permission(mnt_idmap(path->mnt), d_inode(path->dentry), mask);}int __check_sticky(struct mnt_idmap *idmap, struct inode *dir, struct inode *inode);
int may_delete_dentry(struct mnt_idmap *idmap, struct inode *dir, struct dentry *victim, bool isdir);int may_create_dentry(struct mnt_idmap *idmap, struct inode *dir, struct dentry *child);
static inline bool execute_ok(struct inode *inode){ return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);}
static inline bool inode_wrong_type(const struct inode *inode, umode_t mode){ return (inode->i_mode ^ mode) & S_IFMT;}
/** * file_start_write - get write access to a superblock for regular file io * @file: the file we want to write to * * This is a variant of sb_start_write() which is a noop on non-regular file. * Should be matched with a call to file_end_write(). */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);}
static inline bool file_start_write_trylock(struct file *file){ if (!S_ISREG(file_inode(file)->i_mode)) return true; return sb_start_write_trylock(file_inode(file)->i_sb);}
/** * file_end_write - drop write access to a superblock of a regular file * @file: the file we wrote to * * Should be matched with a call to file_start_write(). */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);}
/** * kiocb_start_write - get write access to a superblock for async file io * @iocb: the io context we want to submit the write with * * This is a variant of sb_start_write() for async io submission. * Should be matched with a call to kiocb_end_write(). */static inline void kiocb_start_write(struct kiocb *iocb){ struct inode *inode = file_inode(iocb->ki_filp);
sb_start_write(inode->i_sb); /* * Fool lockdep by telling it the lock got released so that it * doesn't complain about the held lock when we return to userspace. */ __sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);}
/** * kiocb_end_write - drop write access to a superblock after async file io * @iocb: the io context we sumbitted the write with * * Should be matched with a call to kiocb_start_write(). */static inline void kiocb_end_write(struct kiocb *iocb){ struct inode *inode = file_inode(iocb->ki_filp);
/* * Tell lockdep we inherited freeze protection from submission thread. */ __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); sb_end_write(inode->i_sb);}
/* * This is used for regular files where some users -- especially the * currently executed binary in a process, previously handled via * VM_DENYWRITE -- cannot handle concurrent write (and maybe mmap * read-write shared) accesses. * * get_write_access() gets write permission for a file. * put_write_access() releases this write permission. * deny_write_access() denies write access to a file. * allow_write_access() re-enables write access to a file. * * The i_writecount field of an inode can have the following values: * 0: no write access, no denied write access * < 0: (-i_writecount) users that denied write access to the file. * > 0: (i_writecount) users that have write access 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);}
/* * Do not prevent write to executable file when watched by pre-content events. * * Note that FMODE_FSNOTIFY_HSM mode is set depending on pre-content watches at * the time of file open and remains constant for entire lifetime of the file, * so if pre-content watches are added post execution or removed before the end * of the execution, it will not cause i_writecount reference leak. */static inline int exe_file_deny_write_access(struct file *exe_file){ if (unlikely(FMODE_FSNOTIFY_HSM(exe_file->f_mode))) return 0; return deny_write_access(exe_file);}static inline void exe_file_allow_write_access(struct file *exe_file){ if (unlikely(!exe_file || FMODE_FSNOTIFY_HSM(exe_file->f_mode))) return; allow_write_access(exe_file);}
static inline void file_set_fsnotify_mode(struct file *file, fmode_t mode){ file->f_mode &= ~FMODE_FSNOTIFY_MASK; file->f_mode |= mode;}
static inline bool inode_is_open_for_write(const struct inode *inode){ return atomic_read(&inode->i_writecount) > 0;}
#if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING)static inline void i_readcount_dec(struct inode *inode){ BUG_ON(atomic_dec_return(&inode->i_readcount) < 0);}static inline void i_readcount_inc(struct inode *inode){ atomic_inc(&inode->i_readcount);}#elsestatic inline void i_readcount_dec(struct inode *inode){ return;}static inline void i_readcount_inc(struct inode *inode){ return;}#endifextern int do_pipe_flags(int *, int);
extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos);extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *);extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *);extern struct file * open_exec(const char *); /* fs/dcache.c -- generic fs support functions */extern bool is_subdir(struct dentry *, struct dentry *);extern bool path_is_under(const struct path *, const struct path *);u64 vfsmount_to_propagation_flags(struct vfsmount *mnt);
extern char *file_path(struct file *, char *, int);
static inline bool name_is_dot(const char *name, size_t len){ return unlikely(len == 1 && name[0] == '.');}
static inline bool name_is_dotdot(const char *name, size_t len){ return unlikely(len == 2 && name[0] == '.' && name[1] == '.');}
/** * name_is_dot_dotdot - returns true only if @name is "." or ".." * @name: file name to check * @len: length of file name, in bytes */static inline bool name_is_dot_dotdot(const char *name, size_t len){ return len && unlikely(name[0] == '.') && (len == 1 || (len == 2 && name[1] == '.'));}
/** * name_contains_dotdot - check if a file name contains ".." path components * @name: File path string to check * Search for ".." surrounded by either '/' or start/end of string. */static inline bool name_contains_dotdot(const char *name){ size_t name_len;
name_len = strlen(name); return strcmp(name, "..") == 0 || strncmp(name, "../", 3) == 0 || strstr(name, "/../") != NULL || (name_len >= 3 && strcmp(name + name_len - 3, "/..") == 0);}
#include <linux/err.h>
/* needed for stackable file system support */loff_t default_llseek(struct file *file, loff_t offset, int whence);
loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
int inode_init_always_gfp(struct super_block *sb, struct inode *inode, gfp_t gfp);static inline int inode_init_always(struct super_block *sb, struct inode *inode){ return inode_init_always_gfp(sb, inode, GFP_NOFS);}
void inode_init_once(struct inode *inode);void address_space_init_once(struct address_space *mapping);struct inode *igrab(struct inode *inode);ino_t iunique(struct super_block *sb, ino_t max_reserved);int inode_needs_sync(struct inode *inode);int inode_just_drop(struct inode *inode);static inline int inode_generic_drop(struct inode *inode){ return !inode->i_nlink || inode_unhashed(inode);}void d_mark_dontcache(struct inode *inode);
struct inode *ilookup5_nowait(struct super_block *sb, u64 hashval, int (*test)(struct inode *, void *), void *data, bool *isnew);struct inode *ilookup5(struct super_block *sb, u64 hashval, int (*test)(struct inode *, void *), void *data);struct inode *ilookup(struct super_block *sb, u64 ino);
struct inode *inode_insert5(struct inode *inode, u64 hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data);struct inode *iget5_locked(struct super_block *sb, u64 hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data);struct inode *iget5_locked_rcu(struct super_block *sb, u64 hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data);struct inode *iget_locked(struct super_block *sb, u64 ino);struct inode *find_inode_nowait(struct super_block *sb, u64 hashval, int (*match)(struct inode *, u64, void *), void *data);struct inode *find_inode_rcu(struct super_block *sb, u64 hashval, int (*test)(struct inode *, void *), void *data);struct inode *find_inode_by_ino_rcu(struct super_block *sb, u64 ino);int insert_inode_locked4(struct inode *inode, u64 hashval, int (*test)(struct inode *, void *), void *data);int insert_inode_locked(struct inode *inode);#ifdef CONFIG_DEBUG_LOCK_ALLOCvoid lockdep_annotate_inode_mutex_key(struct inode *inode);#elsestatic inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };#endifvoid unlock_new_inode(struct inode *inode);void discard_new_inode(struct inode *inode);unsigned int get_next_ino(void);void evict_inodes(struct super_block *sb);void dump_mapping(const struct address_space *);
/* * Userspace may rely on the inode number being non-zero. For example, glibc * simply ignores files with zero i_ino in unlink() and other places. * * As an additional complication, if userspace was compiled with * _FILE_OFFSET_BITS=32 on a 64-bit kernel we'll only end up reading out the * lower 32 bits, so we need to check that those aren't zero explicitly. With * _FILE_OFFSET_BITS=64, this may cause some harmless false-negatives, but * better safe than sorry. */static inline bool is_zero_ino(ino_t ino){ return (u32)ino == 0;}
static inline void __iget(struct inode *inode){ lockdep_assert_held(&inode->i_lock); atomic_inc(&inode->i_count);}
extern void iget_failed(struct inode *);extern void clear_inode(struct inode *);extern void __destroy_inode(struct inode *);struct inode *alloc_inode(struct super_block *sb);static inline struct inode *new_inode_pseudo(struct super_block *sb){ return alloc_inode(sb);}extern struct inode *new_inode(struct super_block *sb);extern void free_inode_nonrcu(struct inode *inode);extern int setattr_should_drop_suidgid(struct mnt_idmap *, struct inode *);extern int file_remove_privs(struct file *);int setattr_should_drop_sgid(struct mnt_idmap *idmap, const struct inode *inode);
/* * This must be used for allocating filesystems specific inodes to set * up the inode reclaim context correctly. */#define alloc_inode_sb(_sb, _cache, _gfp) kmem_cache_alloc_lru(_cache, &_sb->s_inode_lru, _gfp)
void __insert_inode_hash(struct inode *inode, u64 hashval);static inline void insert_inode_hash(struct inode *inode){ __insert_inode_hash(inode, inode->i_ino);}
void __remove_inode_hash(struct inode *inode);static inline void remove_inode_hash(struct inode *inode){ if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) __remove_inode_hash(inode);}
void inode_sb_list_add(struct inode *inode);void inode_lru_list_add(struct inode *inode);
int generic_file_mmap(struct file *, struct vm_area_struct *);int generic_file_mmap_prepare(struct vm_area_desc *desc);int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc);extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);int generic_write_checks_count(struct kiocb *iocb, loff_t *count);extern int generic_write_check_limits(struct file *file, loff_t pos, loff_t *count);extern int generic_file_rw_checks(struct file *file_in, struct file *file_out);ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *to, ssize_t already_read);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 *);ssize_t generic_perform_write(struct kiocb *, struct iov_iter *);ssize_t direct_write_fallback(struct kiocb *iocb, struct iov_iter *iter, ssize_t direct_written, ssize_t buffered_written);
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, rwf_t flags);ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, rwf_t flags);ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb, struct iov_iter *iter);ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, struct iov_iter *iter);
/* fs/splice.c */ssize_t filemap_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags);ssize_t copy_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags);extern ssize_t iter_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
extern voidfile_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 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);loff_t generic_llseek_cookie(struct file *file, loff_t offset, int whence, u64 *cookie);extern loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size);extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t);extern loff_t no_seek_end_llseek(struct file *, loff_t, int);int rw_verify_area(int, struct file *, const loff_t *, size_t);extern int generic_file_open(struct inode * inode, struct file * filp);extern int nonseekable_open(struct inode * inode, struct file * filp);extern int stream_open(struct inode * inode, struct file * filp);
#ifdef CONFIG_BLOCKtypedef void (dio_submit_t)(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,};
ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, struct block_device *bdev, struct iov_iter *iter, get_block_t get_block, dio_iodone_t end_io, int flags);
static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, struct iov_iter *iter, get_block_t get_block){ return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, get_block, NULL, DIO_LOCKING | DIO_SKIP_HOLES);}#endif
bool inode_dio_finished(const struct inode *inode);void inode_dio_wait(struct inode *inode);void inode_dio_wait_interruptible(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_var(&inode->i_dio_count);}
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 *, int);extern int page_readlink(struct dentry *, char __user *, int);extern const char *page_get_link_raw(struct dentry *, struct inode *, struct delayed_call *);extern const char *page_get_link(struct dentry *, struct inode *, struct delayed_call *);extern void page_put_link(void *);extern int page_symlink(struct inode *inode, const char *symname, int len);extern const struct inode_operations page_symlink_inode_operations;extern void kfree_link(void *);void fill_mg_cmtime(struct kstat *stat, u32 request_mask, struct inode *inode);void generic_fillattr(struct mnt_idmap *, u32, struct inode *, struct kstat *);void generic_fill_statx_attr(struct inode *inode, struct kstat *stat);void generic_fill_statx_atomic_writes(struct kstat *stat, unsigned int unit_min, unsigned int unit_max, unsigned int unit_max_opt);extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int);extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int);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);static inline loff_t __inode_get_bytes(struct inode *inode){ return (((loff_t)inode->i_blocks) << 9) + inode->i_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 *, struct delayed_call *);extern const struct inode_operations simple_symlink_inode_operations;
extern int iterate_dir(struct file *, struct dir_context *);
int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat, int flags);int vfs_fstat(int fd, struct kstat *stat);
static inline int vfs_stat(const char __user *filename, struct kstat *stat){ return vfs_fstatat(AT_FDCWD, filename, stat, 0);}static inline int vfs_lstat(const char __user *name, struct kstat *stat){ return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);}
extern const char *vfs_get_link(struct dentry *, struct delayed_call *);extern int vfs_readlink(struct dentry *, char __user *, int);
extern struct file_system_type *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 void drop_super(struct super_block *sb);extern void drop_super_exclusive(struct super_block *sb);extern void iterate_supers(void (*f)(struct super_block *, void *), void *arg);extern void iterate_supers_type(struct file_system_type *, void (*)(struct super_block *, void *), void *);void filesystems_freeze(bool freeze_all);void filesystems_thaw(void);
void end_dirop(struct dentry *de);
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 mnt_idmap *, struct dentry *, struct iattr *);extern int simple_getattr(struct mnt_idmap *, const struct path *, struct kstat *, u32, unsigned int);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 void __simple_unlink(struct inode *, struct dentry *);extern void __simple_rmdir(struct inode *, struct dentry *);void simple_rename_timestamp(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry);extern int simple_rename_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry);extern int simple_rename(struct mnt_idmap *, struct inode *, struct dentry *, struct inode *, struct dentry *, unsigned int);extern void simple_recursive_removal(struct dentry *, void (*callback)(struct dentry *));extern void simple_remove_by_name(struct dentry *, const char *, void (*callback)(struct dentry *));extern void locked_recursive_removal(struct dentry *, void (*callback)(struct dentry *));extern int noop_fsync(struct file *, loff_t, loff_t, int);extern ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter);extern int simple_empty(struct dentry *);extern int simple_write_begin(const struct kiocb *iocb, struct address_space *mapping, loff_t pos, unsigned len, struct folio **foliop, void **fsdata);extern const struct address_space_operations ram_aops;extern int always_delete_dentry(const struct dentry *);extern struct inode *alloc_anon_inode(struct super_block *);struct inode *anon_inode_make_secure_inode(struct super_block *sb, const char *name, const struct inode *context_inode);
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 { const 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, const 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);struct dentry *simple_start_creating(struct dentry *, const char *);void simple_done_creating(struct dentry *);
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);
struct offset_ctx { struct maple_tree mt; unsigned long next_offset;};
void simple_offset_init(struct offset_ctx *octx);int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry);void simple_offset_remove(struct offset_ctx *octx, struct dentry *dentry);void simple_offset_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry);int simple_offset_rename_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry);void simple_offset_destroy(struct offset_ctx *octx);
extern const struct file_operations simple_offset_dir_operations;
extern int simple_fsync_noflush(struct file *, loff_t, loff_t, int);extern int simple_fsync(struct file *, loff_t, loff_t, int);
extern int generic_check_addressable(unsigned, u64);
extern void generic_set_sb_d_ops(struct super_block *sb);extern int generic_ci_match(const struct inode *parent, const struct qstr *name, const struct qstr *folded_name, const u8 *de_name, u32 de_name_len);
#if IS_ENABLED(CONFIG_UNICODE)int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str);int generic_ci_d_compare(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name);
/** * generic_ci_validate_strict_name - Check if a given name is suitable * for a directory * * This functions checks if the proposed filename is valid for the * parent directory. That means that only valid UTF-8 filenames will be * accepted for casefold directories from filesystems created with the * strict encoding flag. That also means that any name will be * accepted for directories that doesn't have casefold enabled, or * aren't being strict with the encoding. * * @dir: inode of the directory where the new file will be created * @name: name of the new file * * Return: * * True: if the filename is suitable for this directory. It can be * true if a given name is not suitable for a strict encoding * directory, but the directory being used isn't strict * * False if the filename isn't suitable for this directory. This only * happens when a directory is casefolded and the filesystem is strict * about its encoding. */static inline bool generic_ci_validate_strict_name(struct inode *dir, const struct qstr *name){ if (!IS_CASEFOLDED(dir) || !sb_has_strict_encoding(dir->i_sb)) return true;
/* * A casefold dir must have a encoding set, unless the filesystem * is corrupted */ if (WARN_ON_ONCE(!dir->i_sb->s_encoding)) return true;
return !utf8_validate(dir->i_sb->s_encoding, name);}#elsestatic inline bool generic_ci_validate_strict_name(struct inode *dir, const struct qstr *name){ return true;}#endif
int may_setattr(struct mnt_idmap *idmap, struct inode *inode, unsigned int ia_valid);int setattr_prepare(struct mnt_idmap *, struct dentry *, struct iattr *);extern int inode_newsize_ok(const struct inode *, loff_t offset);void setattr_copy(struct mnt_idmap *, struct inode *inode, const struct iattr *attr);
extern int file_update_time(struct file *file);
static inline bool file_is_dax(const struct file *file){ return file && IS_DAX(file->f_mapping->host);}
static inline bool vma_is_dax(const struct vm_area_struct *vma){ return file_is_dax(vma->vm_file);}
static inline bool vma_is_fsdax(struct vm_area_struct *vma){ struct inode *inode;
if (!IS_ENABLED(CONFIG_FS_DAX) || !vma->vm_file) return false; if (!vma_is_dax(vma)) return false; inode = file_inode(vma->vm_file); if (S_ISCHR(inode->i_mode)) return false; /* device-dax */ return true;}
static inline int iocb_flags(struct file *file){ int res = 0; if (file->f_flags & O_APPEND) res |= IOCB_APPEND; if (file->f_flags & O_DIRECT) res |= IOCB_DIRECT; if (file->f_flags & O_DSYNC) res |= IOCB_DSYNC; if (file->f_flags & __O_SYNC) res |= IOCB_SYNC; return res;}
static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags, int rw_type){ int kiocb_flags = 0;
/* make sure there's no overlap between RWF and private IOCB flags */ BUILD_BUG_ON((__force int) RWF_SUPPORTED & IOCB_EVENTFD);
if (!flags) return 0; if (unlikely(flags & ~RWF_SUPPORTED)) return -EOPNOTSUPP; if (unlikely((flags & RWF_APPEND) && (flags & RWF_NOAPPEND))) return -EINVAL;
if (flags & RWF_NOWAIT) { if (!(ki->ki_filp->f_mode & FMODE_NOWAIT)) return -EOPNOTSUPP; } if (flags & RWF_ATOMIC) { if (rw_type != WRITE) return -EOPNOTSUPP; if (!(ki->ki_filp->f_mode & FMODE_CAN_ATOMIC_WRITE)) return -EOPNOTSUPP; } if (flags & RWF_DONTCACHE) { /* file system must support it */ if (!(ki->ki_filp->f_op->fop_flags & FOP_DONTCACHE)) return -EOPNOTSUPP; /* DAX mappings not supported */ if (IS_DAX(ki->ki_filp->f_mapping->host)) return -EOPNOTSUPP; } kiocb_flags |= (__force int) (flags & RWF_SUPPORTED); if (flags & RWF_SYNC) kiocb_flags |= IOCB_DSYNC;
if ((flags & RWF_NOAPPEND) && (ki->ki_flags & IOCB_APPEND)) { if (IS_APPEND(file_inode(ki->ki_filp))) return -EPERM; ki->ki_flags &= ~IOCB_APPEND; }
ki->ki_flags |= kiocb_flags; return 0;}
/* 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[];};
#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_XSIGNED(__fops, __get, __set, __fmt, __is_signed) \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 = (__is_signed) ? simple_attr_write_signed : simple_attr_write, \ .llseek = generic_file_llseek, \}
#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, false)
#define DEFINE_SIMPLE_ATTRIBUTE_SIGNED(__fops, __get, __set, __fmt) \ DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, true)
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);ssize_t simple_attr_write_signed(struct file *file, const char __user *buf, size_t len, loff_t *ppos);
int __init list_bdev_fs_names(char *buf, size_t size);
#define __FMODE_EXEC ((__force int) FMODE_EXEC)
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])#define OPEN_FMODE(flag) ((__force fmode_t)((flag + 1) & O_ACCMODE))
static inline bool is_sxid(umode_t mode){ return mode & (S_ISUID | S_ISGID);}
static inline int check_sticky(struct mnt_idmap *idmap, struct inode *dir, struct inode *inode){ if (!(dir->i_mode & S_ISVTX)) return 0;
return __check_sticky(idmap, dir, inode);}
static inline void inode_has_no_xattr(struct inode *inode){ if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_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){ unsigned int dt_mask = S_DT_MASK | ctx->dt_flags_mask;
return ctx->actor(ctx, name, namelen, ctx->pos, ino, type & dt_mask);}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);}static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx){ return ctx->actor(ctx, "..", 2, ctx->pos, d_parent_ino(file->f_path.dentry), DT_DIR);}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){ inode_unlock(inode); inode_lock(inode); return !IS_DEADDIR(inode);}
static inline bool dir_relax_shared(struct inode *inode){ inode_unlock_shared(inode); inode_lock_shared(inode); return !IS_DEADDIR(inode);}
extern bool path_noexec(const struct path *path);extern void inode_nohighmem(struct inode *inode);
/* mm/fadvise.c */extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len, int advice);extern int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice);
static inline bool vfs_empty_path(int dfd, const char __user *path){ char c;
if (dfd < 0) return false;
/* We now allow NULL to be used for empty path. */ if (!path) return true;
if (unlikely(get_user(c, path))) return false;
return !c;}
int generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter);
static inline bool extensible_ioctl_valid(unsigned int cmd_a, unsigned int cmd_b, size_t min_size){ if (_IOC_DIR(cmd_a) != _IOC_DIR(cmd_b)) return false; if (_IOC_TYPE(cmd_a) != _IOC_TYPE(cmd_b)) return false; if (_IOC_NR(cmd_a) != _IOC_NR(cmd_b)) return false; if (_IOC_SIZE(cmd_a) < min_size) return false; return true;}
#endif /* _LINUX_FS_H */