linux/include/linux/fs.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_FS_H
#define _LINUX_FS_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/list_lru.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/fs_types.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 <asm/byteorder.h>
#include <uapi/linux/fs.h>

struct backing_dev_info;
struct bdi_writeback;
struct bio;
struct io_comp_batch;
struct export_operations;
struct fiemap_extent_info;
struct hd_geometry;
struct iovec;
struct kiocb;
struct kobject;
struct pipe_inode_info;
struct poll_table_struct;
struct kstatfs;
struct vm_area_struct;
struct vfsmount;
struct cred;
struct swap_info_struct;
struct seq_file;
struct workqueue_struct;
struct iov_iter;
struct fscrypt_inode_info;
struct fscrypt_operations;
struct fsverity_info;
struct fsverity_operations;
struct fsnotify_mark_connector;
struct fsnotify_sb_info;
struct fs_context;
struct fs_parameter_spec;
struct fileattr;
struct iomap_ops;

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;

rwf_t;

struct buffer_head;
get_block_t;
dio_iodone_t;

#define MAY_EXEC
#define MAY_WRITE
#define MAY_READ
#define MAY_APPEND
#define MAY_ACCESS
#define MAY_OPEN
#define MAY_CHDIR
/* called from RCU mode, don't block */
#define MAY_NOT_BLOCK

/*
 * 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
/* file is open for writing */
#define FMODE_WRITE
/* file is seekable */
#define FMODE_LSEEK
/* file can be accessed using pread */
#define FMODE_PREAD
/* file can be accessed using pwrite */
#define FMODE_PWRITE
/* File is opened for execution with sys_execve / sys_uselib */
#define FMODE_EXEC
/* File writes are restricted (block device specific) */
#define FMODE_WRITE_RESTRICTED
/* File supports atomic writes */
#define FMODE_CAN_ATOMIC_WRITE

/* FMODE_* bit 8 */

/* 32bit hashes as llseek() offset (for directories) */
#define FMODE_32BITHASH
/* 64bit hashes as llseek() offset (for directories) */
#define FMODE_64BITHASH

/*
 * 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

/* Expect random access pattern */
#define FMODE_RANDOM

/* FMODE_* bit 13 */

/* File is opened with O_PATH; almost nothing can be done with it */
#define FMODE_PATH

/* File needs atomic accesses to f_pos */
#define FMODE_ATOMIC_POS
/* Write access to underlying fs */
#define FMODE_WRITER
/* Has read method(s) */
#define FMODE_CAN_READ
/* Has write method(s) */
#define FMODE_CAN_WRITE

#define FMODE_OPENED
#define FMODE_CREATED

/* File is stream-like */
#define FMODE_STREAM

/* File supports DIRECT IO */
#define FMODE_CAN_ODIRECT

#define FMODE_NOREUSE

/* FMODE_* bit 24 */

/* File is embedded in backing_file object */
#define FMODE_BACKING

/* File was opened by fanotify and shouldn't generate fanotify events */
#define FMODE_NONOTIFY

/* File is capable of returning -EAGAIN if I/O will block */
#define FMODE_NOWAIT

/* File represents mount that needs unmounting */
#define FMODE_NEED_UNMOUNT

/* File does not contribute to nr_files count */
#define FMODE_NOACCOUNT

/*
 * Attribute flags.  These should be or-ed together to figure out what
 * has been changed!
 */
#define ATTR_MODE
#define ATTR_UID
#define ATTR_GID
#define ATTR_SIZE
#define ATTR_ATIME
#define ATTR_MTIME
#define ATTR_CTIME
#define ATTR_ATIME_SET
#define ATTR_MTIME_SET
#define ATTR_FORCE
#define ATTR_KILL_SUID
#define ATTR_KILL_SGID
#define ATTR_FILE
#define ATTR_KILL_PRIV
#define ATTR_OPEN
#define ATTR_TIMES_SET
#define ATTR_TOUCH
#define ATTR_DELEG

/*
 * Whiteout is represented by a char device.  The following constants define the
 * mode and device number to use.
 */
#define WHITEOUT_MODE
#define WHITEOUT_DEV

/*
 * 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 <[email protected]> 94-10-20
 */
struct iattr {};

/*
 * Includes for diskquotas.
 */
#include <linux/quota.h>

/*
 * Maximum number of layers of fs stack.  Needs to be limited to
 * prevent kernel stack overflow
 */
#define FILESYSTEM_MAX_STACK_DEPTH

/** 
 * 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 {};

/*
 * 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
#define IOCB_DSYNC
#define IOCB_SYNC
#define IOCB_NOWAIT
#define IOCB_APPEND
#define IOCB_ATOMIC

/* non-RWF related bits - start at 16 */
#define IOCB_EVENTFD
#define IOCB_DIRECT
#define IOCB_WRITE
/* iocb->ki_waitq is valid */
#define IOCB_WAITQ
#define IOCB_NOIO
/* can use bio alloc cache */
#define IOCB_ALLOC_CACHE
/*
 * IOCB_DIO_CALLER_COMP can be set by the iocb owner, to indicate that the
 * iocb completion can be passed back to the owner for execution from a safe
 * context rather than needing to be punted through a workqueue. If this
 * flag is set, the bio completion handling may set iocb->dio_complete to a
 * handler function and iocb->private to context information for that handler.
 * The issuer should call the handler with that context information from task
 * context to complete the processing of the iocb. Note that while this
 * provides a task context for the dio_complete() callback, it should only be
 * used on the completion side for non-IO generating completions. It's fine to
 * call blocking functions from this callback, but they should not wait for
 * unrelated IO (like cache flushing, new IO generation, etc).
 */
#define IOCB_DIO_CALLER_COMP
/* kiocb is a read or write operation submitted by fs/aio.c. */
#define IOCB_AIO_RW

/* for use in trace events */
#define TRACE_IOCB_STRINGS

struct kiocb {};

static inline bool is_sync_kiocb(struct kiocb *kiocb)
{}

struct address_space_operations {};

extern const struct address_space_operations empty_aops;

/**
 * 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.
 * @nr_thps: Number of THPs in the pagecache (non-shmem only).
 * @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.
 * @i_private_list: For use by the owner of the address_space.
 * @i_private_data: For use by the owner of the address_space.
 */
struct address_space {} __attribute__((aligned)) __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 page's "mapping" pointer be used for PAGE_MAPPING_ANON.
	 */

/* XArray tags, for tagging dirty and writeback pages in the pagecache. */
#define PAGECACHE_TAG_DIRTY
#define PAGECACHE_TAG_WRITEBACK
#define PAGECACHE_TAG_TOWRITE

/*
 * Returns true if any of the pages in the mapping are marked with the tag.
 */
static inline bool mapping_tagged(struct address_space *mapping, xa_mark_t tag)
{}

static inline void i_mmap_lock_write(struct address_space *mapping)
{}

static inline int i_mmap_trylock_write(struct address_space *mapping)
{}

static inline void i_mmap_unlock_write(struct address_space *mapping)
{}

static inline int i_mmap_trylock_read(struct address_space *mapping)
{}

static inline void i_mmap_lock_read(struct address_space *mapping)
{}

static inline void i_mmap_unlock_read(struct address_space *mapping)
{}

static inline void i_mmap_assert_locked(struct address_space *mapping)
{}

static inline void i_mmap_assert_write_locked(struct address_space *mapping)
{}

/*
 * Might pages of this file be mapped into userspace?
 */
static inline int mapping_mapped(struct address_space *mapping)
{}

/*
 * 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(struct address_space *mapping)
{}

static inline int mapping_map_writable(struct address_space *mapping)
{}

static inline void mapping_unmap_writable(struct address_space *mapping)
{}

static inline int mapping_deny_writable(struct address_space *mapping)
{}

static inline void mapping_allow_writable(struct address_space *mapping)
{}

/*
 * 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
#else
#define i_size_ordered_init(inode)
#endif

struct posix_acl;
#define ACL_NOT_CACHED
/*
 * 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

static inline struct posix_acl *
uncached_acl_sentinel(struct task_struct *task)
{}

static inline bool
is_uncached_acl(struct posix_acl *acl)
{}

#define IOP_FASTPERM
#define IOP_LOOKUP
#define IOP_NOFOLLOW
#define IOP_XATTR
#define IOP_DEFAULT_READLINK

/*
 * 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 {} __randomize_layout;

/*
 * Get bit address from inode->i_state to use with wait_var_event()
 * infrastructre.
 */
#define inode_state_wait_address(inode, 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)
{}

struct timespec64 timestamp_truncate(struct timespec64 t, struct inode *inode);

static inline unsigned int i_blocksize(const struct inode *node)
{}

static inline int inode_unhashed(struct inode *inode)
{}

/*
 * __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)
{}

/*
 * inode->i_mutex nesting subclasses for the lock validator:
 *
 * 0: the object of the current VFS operation
 * 1: parent
 * 2: child/target
 * 3: xattr
 * 4: second non-directory
 * 5: second parent (when locking independent directories in rename)
 *
 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
 * non-directories at once.
 *
 * The locking order between these classes is
 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
 */
enum inode_i_mutex_lock_class
{};

static inline void inode_lock(struct inode *inode)
{}

static inline void inode_unlock(struct inode *inode)
{}

static inline void inode_lock_shared(struct inode *inode)
{}

static inline void inode_unlock_shared(struct inode *inode)
{}

static inline int inode_trylock(struct inode *inode)
{}

static inline int inode_trylock_shared(struct inode *inode)
{}

static inline int inode_is_locked(struct inode *inode)
{}

static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
{}

static inline void inode_lock_shared_nested(struct inode *inode, unsigned subclass)
{}

static inline void filemap_invalidate_lock(struct address_space *mapping)
{}

static inline void filemap_invalidate_unlock(struct address_space *mapping)
{}

static inline void filemap_invalidate_lock_shared(struct address_space *mapping)
{}

static inline int filemap_invalidate_trylock_shared(
					struct address_space *mapping)
{}

static inline void filemap_invalidate_unlock_shared(
					struct address_space *mapping)
{}

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)
{}

/*
 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
 */
static inline void i_size_write(struct inode *inode, loff_t i_size)
{}

static inline unsigned iminor(const struct inode *inode)
{}

static inline unsigned imajor(const struct inode *inode)
{}

struct fown_struct {};

/**
 * 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.
 * @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 {};

/*
 * Check if @index falls in the readahead windows.
 */
static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
{}

/**
 * struct file - Represents a file
 * @f_count: reference count
 * @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_path: path of the file
 * @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_owner: file owner
 * @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.)
 */
struct file {} __randomize_layout
  __attribute__((aligned));	/* lest something weird decides that 2 is OK */

struct file_handle {};

static inline struct file *get_file(struct file *f)
{}

struct file *get_file_rcu(struct file __rcu **f);
struct file *get_file_active(struct file **f);

#define file_count(x)

#define MAX_NON_LFS

/* 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
#elif BITS_PER_LONG==64
#define MAX_LFS_FILESIZE
#endif

/* legacy typedef, should eventually be removed */
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
#define OFFT_OFFSET_MAX
#endif

int file_f_owner_allocate(struct file *file);
static inline struct fown_struct *file_f_owner(const struct file *file)
{}

extern void send_sigio(struct fown_struct *fown, int fd, int band);

static inline struct inode *file_inode(const struct file *f)
{}

/*
 * 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 fasync_struct {};

#define FASYNC_MAGIC

/* 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);

/*
 * sb->s_flags.  Note that these mirror the equivalent MS_* flags where
 * represented in both.
 */
#define SB_RDONLY
#define SB_NOSUID
#define SB_NODEV
#define SB_NOEXEC
#define SB_SYNCHRONOUS
#define SB_MANDLOCK
#define SB_DIRSYNC
#define SB_NOATIME
#define SB_NODIRATIME
#define SB_SILENT
#define SB_POSIXACL
#define SB_INLINECRYPT
#define SB_KERNMOUNT
#define SB_I_VERSION
#define SB_LAZYTIME

/* These sb flags are internal to the kernel */
#define SB_DEAD
#define SB_DYING
#define SB_SUBMOUNT
#define SB_FORCE
#define SB_NOSEC
#define SB_BORN
#define SB_ACTIVE
#define SB_NOUSER

/* These flags relate to encoding and casefolding */
#define SB_ENC_STRICT_MODE_FL

#define sb_has_strict_encoding(sb)

/*
 *	Umount options
 */

#define MNT_FORCE
#define MNT_DETACH
#define MNT_EXPIRE
#define UMOUNT_NOFOLLOW
#define UMOUNT_UNUSED

/* sb->s_iflags */
#define SB_I_CGROUPWB
#define SB_I_NOEXEC
#define SB_I_NODEV
#define SB_I_STABLE_WRITES

/* sb->s_iflags to limit user namespace mounts */
#define SB_I_USERNS_VISIBLE
#define SB_I_IMA_UNVERIFIABLE_SIGNATURE
#define SB_I_UNTRUSTED_MOUNTER
#define SB_I_EVM_HMAC_UNSUPPORTED

#define SB_I_SKIP_SYNC
#define SB_I_PERSB_BDI
#define SB_I_TS_EXPIRY_WARNED
#define SB_I_RETIRED
#define SB_I_NOUMASK
#define SB_I_NOIDMAP

/* Possible states of 'frozen' field */
enum {};

#define SB_FREEZE_LEVELS

struct sb_writers {};

struct super_block {} __randomize_layout;

static inline struct user_namespace *i_user_ns(const struct inode *inode)
{}

/* 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)
{}

static inline gid_t i_gid_read(const struct inode *inode)
{}

static inline void i_uid_write(struct inode *inode, uid_t uid)
{}

static inline void i_gid_write(struct inode *inode, gid_t 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)
{}

/**
 * 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)
{}

/**
 * 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)
{}

/**
 * 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)
{}

/**
 * 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)
{}

/**
 * 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)
{}

/**
 * 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_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)
{}

/**
 * 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 timespec64 current_time(struct inode *inode);
struct timespec64 inode_set_ctime_current(struct inode *inode);

static inline time64_t inode_get_atime_sec(const struct inode *inode)
{}

static inline long inode_get_atime_nsec(const struct inode *inode)
{}

static inline struct timespec64 inode_get_atime(const struct inode *inode)
{}

static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
						      struct timespec64 ts)
{}

static inline struct timespec64 inode_set_atime(struct inode *inode,
						time64_t sec, long nsec)
{}

static inline time64_t inode_get_mtime_sec(const struct inode *inode)
{}

static inline long inode_get_mtime_nsec(const struct inode *inode)
{}

static inline struct timespec64 inode_get_mtime(const struct inode *inode)
{}

static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
						      struct timespec64 ts)
{}

static inline struct timespec64 inode_set_mtime(struct inode *inode,
						time64_t sec, long nsec)
{}

static inline time64_t inode_get_ctime_sec(const struct inode *inode)
{}

static inline long inode_get_ctime_nsec(const struct inode *inode)
{}

static inline struct timespec64 inode_get_ctime(const struct inode *inode)
{}

static inline 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 simple_inode_init_ts(struct inode *inode);

/*
 * Snapshotting support.
 */

/*
 * These are internal functions, please use sb_start_{write,pagefault,intwrite}
 * instead.
 */
static inline void __sb_end_write(struct super_block *sb, int level)
{}

static inline void __sb_start_write(struct super_block *sb, int level)
{}

static inline bool __sb_start_write_trylock(struct super_block *sb, int level)
{}

#define __sb_writers_acquired(sb, lev)
#define __sb_writers_release(sb, lev)

/**
 * __sb_write_started - check if sb freeze level is held
 * @sb: the super we write to
 * @level: the freeze level
 *
 * * > 0 - sb freeze level is held
 * *   0 - sb freeze level is not held
 * * < 0 - !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN
 */
static inline int __sb_write_started(const struct super_block *sb, int level)
{}

/**
 * sb_write_started - check if SB_FREEZE_WRITE is held
 * @sb: the super we write to
 *
 * May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN.
 */
static inline bool sb_write_started(const struct super_block *sb)
{}

/**
 * sb_write_not_started - check if SB_FREEZE_WRITE is not held
 * @sb: the super we write to
 *
 * May be false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN.
 */
static inline bool sb_write_not_started(const struct super_block *sb)
{}

/**
 * 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)
{}

/**
 * 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)
{}

/**
 * sb_end_write - drop write access to a superblock
 * @sb: the super we wrote to
 *
 * Decrement number of writers to the filesystem. Wake up possible waiters
 * wanting to freeze the filesystem.
 */
static inline void sb_end_write(struct super_block *sb)
{}

/**
 * sb_end_pagefault - drop write access to a superblock from a page fault
 * @sb: the super we wrote to
 *
 * Decrement number of processes handling write page fault to the filesystem.
 * Wake up possible waiters wanting to freeze the filesystem.
 */
static inline void sb_end_pagefault(struct super_block *sb)
{}

/**
 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
 * @sb: the super we wrote to
 *
 * Decrement fs-internal number of writers to the filesystem.  Wake up possible
 * waiters wanting to freeze the filesystem.
 */
static inline void sb_end_intwrite(struct super_block *sb)
{}

/**
 * sb_start_write - get write access to a superblock
 * @sb: the super we write to
 *
 * When a process wants to write data or metadata to a file system (i.e. dirty
 * a page or an inode), it should embed the operation in a sb_start_write() -
 * sb_end_write() pair to get exclusion against file system freezing. This
 * function increments number of writers preventing freezing. If the file
 * system is already frozen, the function waits until the file system is
 * thawed.
 *
 * Since freeze protection behaves as a lock, users have to preserve
 * ordering of freeze protection and other filesystem locks. Generally,
 * freeze protection should be the outermost lock. In particular, we have:
 *
 * sb_start_write
 *   -> i_mutex			(write path, truncate, directory ops, ...)
 *   -> s_umount		(freeze_super, thaw_super)
 */
static inline void sb_start_write(struct super_block *sb)
{}

static inline bool sb_start_write_trylock(struct super_block *sb)
{}

/**
 * sb_start_pagefault - get write access to a superblock from a page fault
 * @sb: the super we write to
 *
 * When a process starts handling write page fault, it should embed the
 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
 * exclusion against file system freezing. This is needed since the page fault
 * is going to dirty a page. This function increments number of running page
 * faults preventing freezing. If the file system is already frozen, the
 * function waits until the file system is thawed.
 *
 * Since page fault freeze protection behaves as a lock, users have to preserve
 * ordering of freeze protection and other filesystem locks. It is advised to
 * put sb_start_pagefault() close to mmap_lock in lock ordering. Page fault
 * handling code implies lock dependency:
 *
 * mmap_lock
 *   -> sb_start_pagefault
 */
static inline void sb_start_pagefault(struct super_block *sb)
{}

/**
 * sb_start_intwrite - get write access to a superblock for internal fs purposes
 * @sb: the super we write to
 *
 * This is the third level of protection against filesystem freezing. It is
 * free for use by a filesystem. The only requirement is that it must rank
 * below sb_start_pagefault.
 *
 * For example filesystem can call sb_start_intwrite() when starting a
 * transaction which somewhat eases handling of freezing for internal sources
 * of filesystem changes (internal fs threads, discarding preallocation on file
 * close, etc.).
 */
static inline void sb_start_intwrite(struct super_block *sb)
{}

static inline bool sb_start_intwrite_trylock(struct super_block *sb)
{}

bool inode_owner_or_capable(struct mnt_idmap *idmap,
			    const struct inode *inode);

/*
 * VFS helper functions..
 */
int vfs_create(struct mnt_idmap *, struct inode *,
	       struct dentry *, umode_t, bool);
int vfs_mkdir(struct mnt_idmap *, struct inode *,
	      struct dentry *, umode_t);
int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
              umode_t, dev_t);
int vfs_symlink(struct mnt_idmap *, struct inode *,
		struct dentry *, const char *);
int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *,
	     struct dentry *, struct inode **);
int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *);
int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *,
	       struct inode **);

/**
 * struct renamedata - contains all information required for renaming
 * @old_mnt_idmap:     idmap of the old mount the inode was found from
 * @old_dir:           parent of source
 * @old_dentry:                source
 * @new_mnt_idmap:     idmap of the new mount the inode was found from
 * @new_dir:           parent of destination
 * @new_dentry:                destination
 * @delegated_inode:   returns an inode needing a delegation break
 * @flags:             rename flags
 */
struct renamedata {} __randomize_layout;

int vfs_rename(struct renamedata *);

static inline int vfs_whiteout(struct mnt_idmap *idmap,
			       struct inode *dir, struct dentry *dentry)
{}

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);

extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

#ifdef CONFIG_COMPAT
extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
					unsigned long arg);
#else
#define compat_ptr_ioctl
#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;
filldir_t;

struct dir_context {};

/*
 * 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
#define NOMMU_MAP_DIRECT
#define NOMMU_MAP_READ
#define NOMMU_MAP_WRITE
#define NOMMU_MAP_EXEC

#define NOMMU_VMFLAGS

/*
 * 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
#define REMAP_FILE_CAN_SHORTEN

/*
 * 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

/*
 * 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

struct iov_iter;
struct io_uring_cmd;
struct offset_ctx;

fop_flags_t;

struct file_operations {} __randomize_layout;

/* Supports async buffered reads */
#define FOP_BUFFER_RASYNC
/* Supports async buffered writes */
#define FOP_BUFFER_WASYNC
/* Supports synchronous page faults for mappings */
#define FOP_MMAP_SYNC
/* Supports non-exclusive O_DIRECT writes from multiple threads */
#define FOP_DIO_PARALLEL_WRITE
/* Contains huge pages */
#define FOP_HUGE_PAGES
/* Treat loff_t as unsigned (e.g., /dev/mem) */
#define FOP_UNSIGNED_OFFSET

/* 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)

struct inode_operations {} ____cacheline_aligned;

static inline int call_mmap(struct file *file, struct vm_area_struct *vma)
{}

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);

/**
 * enum freeze_holder - holder of the freeze
 * @FREEZE_HOLDER_KERNEL: kernel wants to freeze or thaw filesystem
 * @FREEZE_HOLDER_USERSPACE: userspace wants to freeze or thaw filesystem
 * @FREEZE_MAY_NEST: whether nesting freeze and thaw requests is allowed
 *
 * Indicate who the owner of the freeze or thaw request is and whether
 * the freeze needs to be exclusive or can nest.
 * Without @FREEZE_MAY_NEST, multiple freeze and thaw requests from the
 * same holder aren't allowed. It is however allowed to hold a single
 * @FREEZE_HOLDER_USERSPACE and a single @FREEZE_HOLDER_KERNEL freeze at
 * the same time. This is relied upon by some filesystems during online
 * repair or similar.
 */
enum freeze_holder {};

struct super_operations {};

/*
 * Inode flags - they have no relation to superblock flags now
 */
#define S_SYNC
#define S_NOATIME
#define S_APPEND
#define S_IMMUTABLE
#define S_DEAD
#define S_NOQUOTA
#define S_DIRSYNC
#define S_NOCMTIME
#define S_SWAPFILE
#define S_PRIVATE
#define S_IMA
#define S_AUTOMOUNT
#define S_NOSEC
#ifdef CONFIG_FS_DAX
#define S_DAX
#else
#define S_DAX
#endif
#define S_ENCRYPTED
#define S_CASEFOLD
#define S_VERITY
#define S_KERNEL_FILE

/*
 * 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. -- [email protected]
 */
#define __IS_FLG(inode, flg)

static inline bool sb_rdonly(const struct super_block *sb) {}
#define IS_RDONLY(inode)
#define IS_SYNC(inode)
#define IS_DIRSYNC(inode)
#define IS_MANDLOCK(inode)
#define IS_NOATIME(inode)
#define IS_I_VERSION(inode)

#define IS_NOQUOTA(inode)
#define IS_APPEND(inode)
#define IS_IMMUTABLE(inode)

#ifdef CONFIG_FS_POSIX_ACL
#define IS_POSIXACL(inode)
#else
#define IS_POSIXACL
#endif

#define IS_DEADDIR(inode)
#define IS_NOCMTIME(inode)

#ifdef CONFIG_SWAP
#define IS_SWAPFILE(inode)
#else
#define IS_SWAPFILE
#endif

#define IS_PRIVATE(inode)
#define IS_IMA(inode)
#define IS_AUTOMOUNT(inode)
#define IS_NOSEC(inode)
#define IS_DAX(inode)
#define IS_ENCRYPTED(inode)
#define IS_CASEFOLDED(inode)
#define IS_VERITY(inode)

#define IS_WHITEOUT(inode)

static inline bool HAS_UNMAPPED_ID(struct mnt_idmap *idmap,
				   struct inode *inode)
{}

static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
{}

static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
			       struct file *filp)
{}

/*
 * 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.
 */
#define __I_NEW
#define I_NEW
#define __I_SYNC
#define I_SYNC
#define __I_LRU_ISOLATING
#define I_LRU_ISOLATING

#define I_DIRTY_SYNC
#define I_DIRTY_DATASYNC
#define I_DIRTY_PAGES
#define I_WILL_FREE
#define I_FREEING
#define I_CLEAR
#define I_REFERENCED
#define I_LINKABLE
#define I_DIRTY_TIME
#define I_WB_SWITCH
#define I_OVL_INUSE
#define I_CREATING
#define I_DONTCACHE
#define I_SYNC_QUEUED
#define I_PINNING_NETFS_WB

#define I_DIRTY_INODE
#define I_DIRTY
#define I_DIRTY_ALL

extern void __mark_inode_dirty(struct inode *, int);
static inline void mark_inode_dirty(struct inode *inode)
{}

static inline void mark_inode_dirty_sync(struct inode *inode)
{}

/*
 * 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)
{}

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)
{}

static inline void inode_dec_link_count(struct inode *inode)
{}

enum file_time_flags {};

extern bool atime_needs_update(const struct path *, struct inode *);
extern void touch_atime(const struct path *);
int inode_update_time(struct inode *inode, int flags);

static inline void file_accessed(struct file *file)
{}

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 {};

#define MODULE_ALIAS_FS(NAME)

extern struct dentry *mount_bdev(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data,
	int (*fill_super)(struct super_block *, void *, int));
extern struct dentry *mount_single(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
extern struct dentry *mount_nodev(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
void 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 kill_litter_super(struct super_block *sb);
void deactivate_super(struct super_block *sb);
void deactivate_locked_super(struct super_block *sb);
int set_anon_super(struct super_block *s, void *data);
int 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(struct file_system_type *type,
			int (*test)(struct super_block *,void *),
			int (*set)(struct super_block *,void *),
			int flags, void *data);
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)

#define fops_put(fops)

/*
 * 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)

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 *);
int freeze_super(struct super_block *super, enum freeze_holder who);
int thaw_super(struct super_block *super, enum freeze_holder who);
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)
{}

/* set sb sysfs name based on sb->s_bdev */
static inline void super_set_sysfs_name_bdev(struct super_block *sb)
{}

/* set sb sysfs name based on sb->s_uuid */
static inline void super_set_sysfs_name_uuid(struct super_block *sb)
{}

/* set sb sysfs name based on sb->s_id */
static inline void super_set_sysfs_name_id(struct super_block *sb)
{}

/* 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, ...)
{}

extern int current_umask(void);

extern void ihold(struct inode * inode);
extern void iput(struct inode *);
int inode_update_timestamps(struct inode *inode, int flags);
int generic_update_time(struct inode *, int);

/* /sys/fs */
extern struct kobject *fs_kobj;

#define MAX_RW_COUNT

/* fs/open.c */
struct audit_names;
struct filename {};
static_assert();

static inline struct mnt_idmap *file_mnt_idmap(const struct file *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)
{}

extern long 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);
extern long do_sys_open(int dfd, const char __user *filename, int flags,
			umode_t mode);
extern struct file *file_open_name(struct filename *, int, umode_t);
extern struct file *filp_open(const char *, int, umode_t);
extern struct file *file_open_root(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)
{}
struct file *dentry_open(const struct path *path, int flags,
			 const struct cred *creds);
struct file *dentry_create(const struct path *path, int flags, umode_t mode,
			   const struct cred *cred);
struct path *backing_file_user_path(struct file *f);

/*
 * 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(struct file *f)
{}
/* Get the inode whose inode number to display in /proc/<pid>/maps */
static inline const struct inode *file_user_inode(struct file *f)
{}

static inline struct file *file_clone_open(struct file *file)
{}
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);
extern struct filename *getname(const char __user *);
extern struct filename *getname_kernel(const char *);
extern void putname(struct filename *name);

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)
{}

/* fs/dcache.c */
extern void __init vfs_caches_init_early(void);
extern void __init vfs_caches_init(void);

extern struct kmem_cache *names_cachep;

#define __getname()
#define __putname(name)

extern struct super_block *blockdev_superblock;
static inline bool sb_is_blkdev_sb(struct super_block *sb)
{}

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
/* Marks the bottom of the first segment of free char majors */
#define CHRDEV_MAJOR_DYN_END
/* Marks the top and bottom of the second segment of free char majors */
#define CHRDEV_MAJOR_DYN_EXT_START
#define CHRDEV_MAJOR_DYN_EXT_END

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)
{}

static inline void unregister_chrdev(unsigned int major, const char *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);

static inline int file_write_and_wait(struct file *file)
{}

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)
{}

/*
 * 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)
{}

extern void emergency_sync(void);
extern void emergency_remount(void);

#ifdef CONFIG_BLOCK
extern int bmap(struct inode *inode, sector_t *block);
#else
static inline int bmap(struct inode *inode,  sector_t *block)
{
	return -EINVAL;
}
#endif

int notify_change(struct mnt_idmap *, struct dentry *,
		  struct iattr *, struct 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)
{}
static inline int path_permission(const struct path *path, int mask)
{}
int __check_sticky(struct mnt_idmap *idmap, struct inode *dir,
		   struct inode *inode);

static inline bool execute_ok(struct inode *inode)
{}

static inline bool inode_wrong_type(const struct inode *inode, umode_t mode)
{}

/**
 * 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-regualr file.
 * Should be matched with a call to file_end_write().
 */
static inline void file_start_write(struct file *file)
{}

static inline bool file_start_write_trylock(struct file *file)
{}

/**
 * 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)
{}

/**
 * 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)
{}

/**
 * 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)
{}

/*
 * 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)
{}
static inline int deny_write_access(struct file *file)
{}
static inline void put_write_access(struct inode * inode)
{}
static inline void allow_write_access(struct file *file)
{}
static inline bool inode_is_open_for_write(const struct inode *inode)
{}

#if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING)
static inline void i_readcount_dec(struct inode *inode)
{}
static inline void i_readcount_inc(struct inode *inode)
{}
#else
static inline void i_readcount_dec(struct inode *inode)
{
	return;
}
static inline void i_readcount_inc(struct inode *inode)
{
	return;
}
#endif
extern int do_pipe_flags(int *, int);

extern 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 *);

extern char *file_path(struct file *, char *, int);

/**
 * 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 is_dot_dotdot(const char *name, size_t len)
{}

#include <linux/err.h>

/* needed for stackable file system support */
extern loff_t default_llseek(struct file *file, loff_t offset, int whence);

extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);

extern int inode_init_always(struct super_block *, struct inode *);
extern void inode_init_once(struct inode *);
extern void address_space_init_once(struct address_space *mapping);
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
extern int inode_needs_sync(struct inode *inode);
extern int generic_delete_inode(struct inode *inode);
static inline int generic_drop_inode(struct inode *inode)
{}
extern void d_mark_dontcache(struct inode *inode);

extern struct inode *ilookup5_nowait(struct super_block *sb,
		unsigned long hashval, int (*test)(struct inode *, void *),
		void *data);
extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
		int (*test)(struct inode *, void *), void *data);
extern struct inode *ilookup(struct super_block *sb, unsigned long ino);

extern struct inode *inode_insert5(struct inode *inode, unsigned long hashval,
		int (*test)(struct inode *, void *),
		int (*set)(struct inode *, void *),
		void *data);
struct inode *iget5_locked(struct super_block *, unsigned long,
			   int (*test)(struct inode *, void *),
			   int (*set)(struct inode *, void *), void *);
struct inode *iget5_locked_rcu(struct super_block *, unsigned long,
			       int (*test)(struct inode *, void *),
			       int (*set)(struct inode *, void *), void *);
extern struct inode * iget_locked(struct super_block *, unsigned long);
extern struct inode *find_inode_nowait(struct super_block *,
				       unsigned long,
				       int (*match)(struct inode *,
						    unsigned long, void *),
				       void *data);
extern struct inode *find_inode_rcu(struct super_block *, unsigned long,
				    int (*)(struct inode *, void *), void *);
extern struct inode *find_inode_by_ino_rcu(struct super_block *, unsigned long);
extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
extern int insert_inode_locked(struct inode *);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
#else
static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
#endif
extern void unlock_new_inode(struct inode *);
extern void discard_new_inode(struct inode *);
extern unsigned int get_next_ino(void);
extern 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)
{}

/*
 * inode->i_lock must be held
 */
static inline void __iget(struct inode *inode)
{}

extern void iget_failed(struct inode *);
extern void clear_inode(struct inode *);
extern void __destroy_inode(struct inode *);
extern struct inode *new_inode_pseudo(struct super_block *sb);
extern struct inode *new_inode(struct super_block *sb);
extern void free_inode_nonrcu(struct inode *inode);
extern int setattr_should_drop_suidgid(struct mnt_idmap *, struct inode *);
extern int file_remove_privs_flags(struct file *file, unsigned int flags);
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)

extern void __insert_inode_hash(struct inode *, unsigned long hashval);
static inline void insert_inode_hash(struct inode *inode)
{}

extern void __remove_inode_hash(struct inode *);
static inline void remove_inode_hash(struct inode *inode)
{}

extern void inode_sb_list_add(struct inode *inode);
extern void inode_add_lru(struct inode *inode);

extern int sb_set_blocksize(struct super_block *, int);
extern int sb_min_blocksize(struct super_block *, int);

extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);
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 void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
extern loff_t 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_BLOCK
dio_submit_t;

enum {};

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)
{}
#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)
{}

/**
 * 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)
{}

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)

extern int readlink_copy(char __user *, int, const char *);
extern int page_readlink(struct dentry *, char __user *, int);
extern const char *page_get_link(struct dentry *, struct inode *,
				 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 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);
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)
{}
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)
{}
static inline int vfs_lstat(const char __user *name, struct kstat *stat)
{}

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 (*)(struct super_block *, void *), void *);
extern void iterate_supers_type(struct file_system_type *,
			        void (*)(struct super_block *, void *), void *);

extern int dcache_dir_open(struct inode *, struct file *);
extern int dcache_dir_close(struct inode *, struct file *);
extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
extern int dcache_readdir(struct file *, struct dir_context *);
extern int simple_setattr(struct 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 *);
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 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(struct file *file, 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 *);
extern int simple_nosetlease(struct file *, int, struct file_lease **, void **);
extern const struct dentry_operations simple_dentry_operations;

extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
extern const struct file_operations simple_dir_operations;
extern const struct inode_operations simple_dir_inode_operations;
extern void make_empty_dir_inode(struct inode *inode);
extern bool is_empty_dir_inode(struct inode *inode);
struct tree_descr {};
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);

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 {};

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);
int simple_offset_empty(struct dentry *dentry);
int 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 __generic_file_fsync(struct file *, loff_t, loff_t, int);
extern int generic_file_fsync(struct file *, loff_t, loff_t, int);

extern int generic_check_addressable(unsigned, u64);

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);

static inline bool sb_has_encoding(const struct super_block *sb)
{}

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 vma_is_dax(const struct vm_area_struct *vma)
{}

static inline bool vma_is_fsdax(struct vm_area_struct *vma)
{}

static inline int iocb_flags(struct file *file)
{}

static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags,
				     int rw_type)
{}

/* 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 {};

#define SIMPLE_TRANSACTION_LIMIT

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)

#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)

#define DEFINE_SIMPLE_ATTRIBUTE_SIGNED(__fops, __get, __set, __fmt)

static inline __printf(1, 2)
void __simple_attr_check_format(const char *fmt, ...)
{}

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);

struct ctl_table;
int __init list_bdev_fs_names(char *buf, size_t size);

#define __FMODE_EXEC
#define __FMODE_NONOTIFY

#define ACC_MODE(x)
#define OPEN_FMODE(flag)

static inline bool is_sxid(umode_t mode)
{}

static inline int check_sticky(struct mnt_idmap *idmap,
			       struct inode *dir, struct inode *inode)
{}

static inline void inode_has_no_xattr(struct inode *inode)
{}

static inline bool is_root_inode(struct inode *inode)
{}

static inline bool dir_emit(struct dir_context *ctx,
			    const char *name, int namelen,
			    u64 ino, unsigned type)
{}
static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
{}
static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
{}
static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
{}
static inline bool dir_relax(struct inode *inode)
{}

static inline bool dir_relax_shared(struct inode *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)
{}

bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos);

#endif /* _LINUX_FS_H */