__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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/* 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 <linux/file_ref.h>
#include <linux/unicode.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;

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))

/* FMODE_* bit 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 a 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 pre-content events.
 */
#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_PERM(mode) \
	((mode & FMODE_FSNOTIFY_MASK) == 0 || \
	 (mode & FMODE_FSNOTIFY_MASK) == (FMODE_NONOTIFY | FMODE_NONOTIFY_PERM))
#define FMODE_FSNOTIFY_HSM(mode) \
	((mode & FMODE_FSNOTIFY_MASK) == 0)
#else
#define FMODE_FSNOTIFY_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_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 <[email protected]> 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;
};

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

/*
 * Maximum number of layers of fs stack.  Needs to be limited to
 * prevent kernel stack overflow
 */
#define FILESYSTEM_MAX_STACK_DEPTH 2

/** 
 * enum positive_aop_returns - aop return codes with specific semantics
 *
 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
 * 			    completed, that the page is still locked, and
 * 			    should be considered active.  The VM uses this hint
 * 			    to return the page to the active list -- it won't
 * 			    be a candidate for writeback again in the near
 * 			    future.  Other callers must be careful to unlock
 * 			    the page if they get this return.  Returned by
 * 			    writepage(); 
 *
 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
 *  			unlocked it and the page might have been truncated.
 *  			The caller should back up to acquiring a new page and
 *  			trying again.  The aop will be taking reasonable
 *  			precautions not to livelock.  If the caller held a page
 *  			reference, it should drop it before retrying.  Returned
 *  			by 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

/* 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)
/*
 * 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	(1 << 22)
/* kiocb is a read or write operation submitted by fs/aio.c. */
#define IOCB_AIO_RW		(1 << 23)
#define IOCB_HAS_METADATA	(1 << 24)

/* 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_DIO_CALLER_COMP,	"CALLER_COMP" }

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 */
	union {
		/*
		 * 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;
		/*
		 * Can be used for O_DIRECT IO, where the completion handling
		 * is punted back to the issuer of the IO. May only be set
		 * if IOCB_DIO_CALLER_COMP is set by the issuer, and the issuer
		 * must then check for presence of this handler when ki_complete
		 * is invoked. The data passed in to this handler must be
		 * assigned to ->private when dio_complete is assigned.
		 */
		ssize_t (*dio_complete)(void *data);
	};
};

static inline bool is_sync_kiocb(struct kiocb *kiocb)
{
	return kiocb->ki_complete == NULL;
}

struct address_space_operations {
	int (*writepage)(struct page *page, struct writeback_control *wbc);
	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)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len,
				struct folio **foliop, void **fsdata);
	int (*write_end)(struct file *, 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);
	int (*swap_rw)(struct kiocb *iocb, struct iov_iter *iter);
};

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 {
	struct inode		*host;
	struct xarray		i_pages;
	struct rw_semaphore	invalidate_lock;
	gfp_t			gfp_mask;
	atomic_t		i_mmap_writable;
#ifdef CONFIG_READ_ONLY_THP_FOR_FS
	/* number of thp, only for non-shmem files */
	atomic_t		nr_thps;
#endif
	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 list_head	i_private_list;
	struct rw_semaphore	i_mmap_rwsem;
	void *			i_private_data;
} __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 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	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(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(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(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 bool
is_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

/*
 * Keep mostly read-only and often accessed (especially for
 * the RCU path lookup and 'stat' data) fields at the beginning
 * of the 'struct inode'
 */
struct inode {
	umode_t			i_mode;
	unsigned short		i_opflags;
	kuid_t			i_uid;
	kgid_t			i_gid;
	unsigned int		i_flags;

#ifdef CONFIG_FS_POSIX_ACL
	struct posix_acl	*i_acl;
	struct posix_acl	*i_default_acl;
#endif

	const struct inode_operations	*i_op;
	struct super_block	*i_sb;
	struct address_space	*i_mapping;

#ifdef CONFIG_SECURITY
	void			*i_security;
#endif

	/* Stat data, not accessed from path walking */
	unsigned long		i_ino;
	/*
	 * Filesystems may only read i_nlink directly.  They shall use the
	 * following functions for modification:
	 *
	 *    (set|clear|inc|drop)_nlink
	 *    inode_(inc|dec)_link_count
	 */
	union {
		const unsigned int i_nlink;
		unsigned int __i_nlink;
	};
	dev_t			i_rdev;
	loff_t			i_size;
	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 */
	u32			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

#ifdef CONFIG_FS_ENCRYPTION
	struct fscrypt_inode_info	*i_crypt_info;
#endif

#ifdef CONFIG_FS_VERITY
	struct fsverity_info	*i_verity_info;
#endif

	void			*i_private; /* fs or device private pointer */
} __randomize_layout;

static inline void inode_set_cached_link(struct inode *inode, char *link, int linklen)
{
	int testlen;

	/*
	 * TODO: patch it into a debug-only check if relevant macros show up.
	 * In the meantime, since we are suffering strlen even on production kernels
	 * to find the right length, do a fixup if the wrong value got passed.
	 */
	testlen = strlen(link);
	if (testlen != linklen) {
		WARN_ONCE(1, "bad length passed for symlink [%s] (got %d, expected %d)",
			  link, linklen, testlen);
		linklen = testlen;
	}
	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);
}

/*
 * inode->i_mutex nesting subclasses for the lock validator:
 *
 * 0: the object of the current VFS operation
 * 1: parent
 * 2: child/target
 * 3: xattr
 * 4: second non-directory
 * 5: second parent (when locking independent directories in rename)
 *
 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
 * non-directories at once.
 *
 * The locking order between these classes is
 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
 */
enum inode_i_mutex_lock_class
{
	I_MUTEX_NORMAL,
	I_MUTEX_PARENT,
	I_MUTEX_CHILD,
	I_MUTEX_XATTR,
	I_MUTEX_NONDIR2,
	I_MUTEX_PARENT2,
};

static inline void inode_lock(struct inode *inode)
{
	down_write(&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 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_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
 */
static inline void i_size_write(struct inode *inode, loff_t i_size)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	preempt_disable();
	write_seqcount_begin(&inode->i_size_seqcount);
	inode->i_size = i_size;
	write_seqcount_end(&inode->i_size_seqcount);
	preempt_enable();
#elif BITS_PER_LONG==32 && defined(CONFIG_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.
 * @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 int 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_ref: 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 {
	file_ref_t			f_ref;
	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;
	/* --- cacheline 1 boundary (64 bytes) --- */
	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) --- */
	struct fown_struct		*f_owner;
	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;
	};
	/* --- 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);

/*
 * sb->s_flags.  Note that these mirror the equivalent MS_* flags where
 * represented in both.
 */
#define SB_RDONLY       BIT(0)	/* Mount read-only */
#define SB_NOSUID       BIT(1)	/* Ignore suid and sgid bits */
#define SB_NODEV        BIT(2)	/* Disallow access to device special files */
#define SB_NOEXEC       BIT(3)	/* Disallow program execution */
#define SB_SYNCHRONOUS  BIT(4)	/* Writes are synced at once */
#define SB_MANDLOCK     BIT(6)	/* Allow mandatory locks on an FS */
#define SB_DIRSYNC      BIT(7)	/* Directory modifications are synchronous */
#define SB_NOATIME      BIT(10)	/* Do not update access times. */
#define SB_NODIRATIME   BIT(11)	/* Do not update directory access times */
#define SB_SILENT       BIT(15)
#define SB_POSIXACL     BIT(16)	/* Supports POSIX ACLs */
#define SB_INLINECRYPT  BIT(17)	/* Use blk-crypto for encrypted files */
#define SB_KERNMOUNT    BIT(22)	/* this is a kern_mount call */
#define SB_I_VERSION    BIT(23)	/* Update inode I_version field */
#define SB_LAZYTIME     BIT(25)	/* Update the on-disk [acm]times lazily */

/* These sb flags are internal to the kernel */
#define SB_DEAD         BIT(21)
#define SB_DYING        BIT(24)
#define SB_SUBMOUNT     BIT(26)
#define SB_FORCE        BIT(27)
#define SB_NOSEC        BIT(28)
#define SB_BORN         BIT(29)
#define SB_ACTIVE       BIT(30)
#define SB_NOUSER       BIT(31)

/* These flags relate to encoding and casefolding */
#define SB_ENC_STRICT_MODE_FL	(1 << 0)

#define sb_has_strict_encoding(sb) \
	(sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL)

/*
 *	Umount options
 */

#define MNT_FORCE	0x00000001	/* Attempt to forcibily umount */
#define MNT_DETACH	0x00000002	/* Just detach from the tree */
#define MNT_EXPIRE	0x00000004	/* Mark for expiry */
#define UMOUNT_NOFOLLOW	0x00000008	/* Don't follow symlink on umount */
#define UMOUNT_UNUSED	0x80000000	/* Flag guaranteed to be unused */

/* sb->s_iflags */
#define SB_I_CGROUPWB	0x00000001	/* cgroup-aware writeback enabled */
#define SB_I_NOEXEC	0x00000002	/* Ignore executables on this fs */
#define SB_I_NODEV	0x00000004	/* Ignore devices on this fs */
#define SB_I_STABLE_WRITES 0x00000008	/* don't modify blks until WB is done */

/* sb->s_iflags to limit user namespace mounts */
#define SB_I_USERNS_VISIBLE		0x00000010 /* fstype already mounted */
#define SB_I_IMA_UNVERIFIABLE_SIGNATURE	0x00000020
#define SB_I_UNTRUSTED_MOUNTER		0x00000040
#define SB_I_EVM_HMAC_UNSUPPORTED	0x00000080

#define SB_I_SKIP_SYNC	0x00000100	/* Skip superblock at global sync */
#define SB_I_PERSB_BDI	0x00000200	/* has a per-sb bdi */
#define SB_I_TS_EXPIRY_WARNED 0x00000400 /* warned about timestamp range expiry */
#define SB_I_RETIRED	0x00000800	/* superblock shouldn't be reused */
#define SB_I_NOUMASK	0x00001000	/* VFS does not apply umask */
#define SB_I_NOIDMAP	0x00002000	/* No idmapped mounts on this superblock */
#define SB_I_ALLOW_HSM	0x00004000	/* Allow HSM events on this superblock */

/* Possible states of 'frozen' field */
enum {
	SB_UNFROZEN = 0,		/* FS is unfrozen */
	SB_FREEZE_WRITE	= 1,		/* Writes, dir ops, ioctls frozen */
	SB_FREEZE_PAGEFAULT = 2,	/* Page faults stopped as well */
	SB_FREEZE_FS = 3,		/* For internal FS use (e.g. to stop
					 * internal threads if needed) */
	SB_FREEZE_COMPLETE = 4,		/* ->freeze_fs finished successfully */
};

#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)

struct sb_writers {
	unsigned short			frozen;		/* Is sb frozen? */
	int				freeze_kcount;	/* How many kernel freeze requests? */
	int				freeze_ucount;	/* How many userspace freeze requests? */
	struct percpu_rw_semaphore	rw_sem[SB_FREEZE_LEVELS];
};

struct super_block {
	struct list_head	s_list;		/* Keep this first */
	dev_t			s_dev;		/* search index; _not_ kdev_t */
	unsigned char		s_blocksize_bits;
	unsigned long		s_blocksize;
	loff_t			s_maxbytes;	/* Max file size */
	struct file_system_type	*s_type;
	const struct super_operations	*s_op;
	const struct dquot_operations	*dq_op;
	const struct quotactl_ops	*s_qcop;
	const struct export_operations *s_export_op;
	unsigned long		s_flags;
	unsigned long		s_iflags;	/* internal SB_I_* flags */
	unsigned long		s_magic;
	struct dentry		*s_root;
	struct rw_semaphore	s_umount;
	int			s_count;
	atomic_t		s_active;
#ifdef CONFIG_SECURITY
	void                    *s_security;
#endif
	const struct xattr_handler * const *s_xattr;
#ifdef CONFIG_FS_ENCRYPTION
	const struct fscrypt_operations	*s_cop;
	struct fscrypt_keyring	*s_master_keys; /* master crypto keys in use */
#endif
#ifdef CONFIG_FS_VERITY
	const struct fsverity_operations *s_vop;
#endif
#if IS_ENABLED(CONFIG_UNICODE)
	struct unicode_map *s_encoding;
	__u16 s_encoding_flags;
#endif
	struct hlist_bl_head	s_roots;	/* alternate root dentries for NFS */
	struct list_head	s_mounts;	/* list of mounts; _not_ for fs use */
	struct block_device	*s_bdev;	/* can go away once we use an accessor for @s_bdev_file */
	struct file		*s_bdev_file;
	struct backing_dev_info *s_bdi;
	struct mtd_info		*s_mtd;
	struct hlist_node	s_instances;
	unsigned int		s_quota_types;	/* Bitmask of supported quota types */
	struct quota_info	s_dquot;	/* Diskquota specific options */

	struct sb_writers	s_writers;

	/*
	 * Keep s_fs_info, s_time_gran, s_fsnotify_mask, and
	 * s_fsnotify_info together for cache efficiency. They are frequently
	 * accessed and rarely modified.
	 */
	void			*s_fs_info;	/* Filesystem private info */

	/* Granularity of c/m/atime in ns (cannot be worse than a second) */
	u32			s_time_gran;
	/* Time limits for c/m/atime in seconds */
	time64_t		   s_time_min;
	time64_t		   s_time_max;
#ifdef CONFIG_FSNOTIFY
	u32			s_fsnotify_mask;
	struct fsnotify_sb_info	*s_fsnotify_info;
#endif

	/*
	 * q: why are s_id and s_sysfs_name not the same? both are human
	 * readable strings that identify the filesystem
	 * a: s_id is allowed to change at runtime; it's used in log messages,
	 * and we want to when a device starts out as single device (s_id is dev
	 * name) but then a device is hot added and we have to switch to
	 * identifying it by UUID
	 * but s_sysfs_name is a handle for programmatic access, and can't
	 * change at runtime
	 */
	char			s_id[32];	/* Informational name */
	uuid_t			s_uuid;		/* UUID */
	u8			s_uuid_len;	/* Default 16, possibly smaller for weird filesystems */

	/* if set, fs shows up under sysfs at /sys/fs/$FSTYP/s_sysfs_name */
	char			s_sysfs_name[UUID_STRING_LEN + 1];

	unsigned int		s_max_links;

	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
	struct mutex s_vfs_rename_mutex;	/* Kludge */

	/*
	 * Filesystem subtype.  If non-empty the filesystem type field
	 * in /proc/mounts will be "type.subtype"
	 */
	const char *s_subtype;

	const struct dentry_operations *s_d_op; /* default d_op for dentries */

	struct shrinker *s_shrink;	/* per-sb shrinker handle */

	/* Number of inodes with nlink == 0 but still referenced */
	atomic_long_t s_remove_count;

	/* Read-only state of the superblock is being changed */
	int s_readonly_remount;

	/* per-sb errseq_t for reporting writeback errors via syncfs */
	errseq_t s_wb_err;

	/* AIO completions deferred from interrupt context */
	struct workqueue_struct *s_dio_done_wq;
	struct hlist_head s_pins;

	/*
	 * Owning user namespace and default context in which to
	 * interpret filesystem uids, gids, quotas, device nodes,
	 * xattrs and security labels.
	 */
	struct user_namespace *s_user_ns;

	/*
	 * The list_lru structure is essentially just a pointer to a table
	 * of per-node lru lists, each of which has its own spinlock.
	 * There is no need to put them into separate cachelines.
	 */
	struct list_lru		s_dentry_lru;
	struct list_lru		s_inode_lru;
	struct rcu_head		rcu;
	struct work_struct	destroy_work;

	struct mutex		s_sync_lock;	/* sync serialisation lock */

	/*
	 * Indicates how deep in a filesystem stack this SB is
	 */
	int s_stack_depth;

	/* s_inode_list_lock protects s_inodes */
	spinlock_t		s_inode_list_lock ____cacheline_aligned_in_smp;
	struct list_head	s_inodes;	/* all inodes */

	spinlock_t		s_inode_wblist_lock;
	struct list_head	s_inodes_wb;	/* writeback inodes */
} __randomize_layout;

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 inode->i_atime_sec;
}

static inline long inode_get_atime_nsec(const struct inode *inode)
{
	return 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)
{
	inode->i_atime_sec = ts.tv_sec;
	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 inode->i_mtime_sec;
}

static inline long inode_get_mtime_nsec(const struct inode *inode)
{
	return 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)
{
	inode->i_mtime_sec = ts.tv_sec;
	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 inode->i_ctime_sec;
}

static inline long inode_get_ctime_nsec(const struct inode *inode)
{
	return 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);

/*
 * 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)
{
	percpu_up_read(sb->s_writers.rw_sem + level-1);
}

static inline void __sb_start_write(struct super_block *sb, int level)
{
	percpu_down_read(sb->s_writers.rw_sem + level - 1);
}

static inline bool __sb_start_write_trylock(struct super_block *sb, int level)
{
	return percpu_down_read_trylock(sb->s_writers.rw_sem + level - 1);
}

#define __sb_writers_acquired(sb, lev)	\
	percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
#define __sb_writers_release(sb, lev)	\
	percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], _THIS_IP_)

/**
 * __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)
{
	return lockdep_is_held_type(sb->s_writers.rw_sem + level - 1, 1);
}

/**
 * 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)
{
	return __sb_write_started(sb, SB_FREEZE_WRITE);
}

/**
 * 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)
{
	return __sb_write_started(sb, SB_FREEZE_WRITE) <= 0;
}

/**
 * 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);
}

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

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

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

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

static inline bool sb_start_write_trylock(struct super_block *sb)
{
	return __sb_start_write_trylock(sb, SB_FREEZE_WRITE);
}

/**
 * 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_write(sb, SB_FREEZE_PAGEFAULT);
}

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

static inline bool sb_start_intwrite_trylock(struct super_block *sb)
{
	return __sb_start_write_trylock(sb, SB_FREEZE_FS);
}

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 {
	struct mnt_idmap *old_mnt_idmap;
	struct inode *old_dir;
	struct dentry *old_dentry;
	struct mnt_idmap *new_mnt_idmap;
	struct inode *new_dir;
	struct dentry *new_dentry;
	struct 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);
}

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 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;
};

/*
 * 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 iov_iter;
struct io_uring_cmd;
struct offset_ctx;

typedef unsigned int __bitwise fop_flags_t;

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);
} __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))

/* 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); }

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, bool);
	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 *);
	int (*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 *, int);
	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 fileattr *fa);
	int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa);
	struct offset_ctx *(*get_offset_ctx)(struct inode *inode);
} ____cacheline_aligned;

static inline int call_mmap(struct file *file, struct vm_area_struct *vma)
{
	return file->f_op->mmap(file, 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 {
	FREEZE_HOLDER_KERNEL	= (1U << 0),
	FREEZE_HOLDER_USERSPACE	= (1U << 1),
	FREEZE_MAY_NEST		= (1U << 2),
};

struct super_operations {
   	struct inode *(*alloc_inode)(struct super_block *sb);
	void (*destroy_inode)(struct inode *);
	void (*free_inode)(struct inode *);

   	void (*dirty_inode) (struct inode *, int flags);
	int (*write_inode) (struct inode *, struct writeback_control *wbc);
	int (*drop_inode) (struct inode *);
	void (*evict_inode) (struct inode *);
	void (*put_super) (struct super_block *);
	int (*sync_fs)(struct super_block *sb, int wait);
	int (*freeze_super) (struct super_block *, enum freeze_holder who);
	int (*freeze_fs) (struct super_block *);
	int (*thaw_super) (struct super_block *, enum freeze_holder who);
	int (*unfreeze_fs) (struct super_block *);
	int (*statfs) (struct dentry *, struct kstatfs *);
	int (*remount_fs) (struct super_block *, int *, char *);
	void (*umount_begin) (struct super_block *);

	int (*show_options)(struct seq_file *, struct dentry *);
	int (*show_devname)(struct seq_file *, struct dentry *);
	int (*show_path)(struct seq_file *, struct dentry *);
	int (*show_stats)(struct seq_file *, struct dentry *);
#ifdef CONFIG_QUOTA
	ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
	ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
	struct dquot __rcu **(*get_dquots)(struct inode *);
#endif
	long (*nr_cached_objects)(struct super_block *,
				  struct shrink_control *);
	long (*free_cached_objects)(struct super_block *,
				    struct shrink_control *);
	void (*shutdown)(struct super_block *sb);
};

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

static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & SB_RDONLY; }
#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,
	};
}

/*
 * 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			0
#define I_NEW			(1 << __I_NEW)
#define __I_SYNC		1
#define I_SYNC			(1 << __I_SYNC)
#define __I_LRU_ISOLATING	2
#define I_LRU_ISOLATING		(1 << __I_LRU_ISOLATING)

#define I_DIRTY_SYNC		(1 << 3)
#define I_DIRTY_DATASYNC	(1 << 4)
#define I_DIRTY_PAGES		(1 << 5)
#define I_WILL_FREE		(1 << 6)
#define I_FREEING		(1 << 7)
#define I_CLEAR			(1 << 8)
#define I_REFERENCED		(1 << 9)
#define I_LINKABLE		(1 << 10)
#define I_DIRTY_TIME		(1 << 11)
#define I_WB_SWITCH		(1 << 12)
#define I_OVL_INUSE		(1 << 13)
#define I_CREATING		(1 << 14)
#define I_DONTCACHE		(1 << 15)
#define I_SYNC_QUEUED		(1 << 16)
#define I_PINNING_NETFS_WB	(1 << 17)

#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)

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);
}

/*
 * 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->i_state & (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);
}

enum file_time_flags {
	S_ATIME = 1,
	S_MTIME = 2,
	S_CTIME = 4,
	S_VERSION = 8,
};

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

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_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;
	struct dentry *(*mount) (struct file_system_type *, int,
		       const char *, void *);
	void (*kill_sb) (struct super_block *);
	struct module *owner;
	struct file_system_type * next;
	struct hlist_head fs_supers;

	struct lock_class_key s_lock_key;
	struct lock_class_key s_umount_key;
	struct lock_class_key s_vfs_rename_key;
	struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];

	struct lock_class_key i_lock_key;
	struct lock_class_key i_mutex_key;
	struct lock_class_key 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_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) ({						\
	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 *);
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)
{
	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 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 (INT_MAX & PAGE_MASK)

/* fs/open.c */
struct audit_names;
struct filename {
	const char		*name;	/* pointer to actual string */
	const __user char	*uptr;	/* original userland pointer */
	atomic_t		refcnt;
	struct audit_names	*aname;
	const char		iname[];
};
static_assert(offsetof(struct filename, iname) % sizeof(long) == 0);

static inline struct mnt_idmap *file_mnt_idmap(const struct file *file)
{
	return mnt_idmap(file->f_path.mnt);
}

/**
 * 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;
}

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)
{
	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(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)
{
	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(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);
extern struct filename *getname(const char __user *);
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);

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);

extern struct kmem_cache *names_cachep;

#define __getname()		kmem_cache_alloc(names_cachep, GFP_KERNEL)
#define __putname(name)		kmem_cache_free(names_cachep, (void *)(name))

extern struct super_block *blockdev_superblock;
static inline bool sb_is_blkdev_sb(struct super_block *sb)
{
	return IS_ENABLED(CONFIG_BLOCK) && sb == blockdev_superblock;
}

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_fdatawrite_range_kick(struct address_space *mapping, loff_t start,
		loff_t end);

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) {
		struct address_space *mapping = iocb->ki_filp->f_mapping;

		filemap_fdatawrite_range_kick(mapping, iocb->ki_pos - count,
					      iocb->ki_pos - 1);
	}

	return 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)
{
	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);

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-regualr 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);
}
#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)
{
	return len && unlikely(name[0] == '.') &&
		(len == 1 || (len == 2 && name[1] == '.'));
}

#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_gfp(struct super_block *, struct inode *, gfp_t);
static inline int inode_init_always(struct super_block *sb, struct inode *inode)
{
	return inode_init_always_gfp(sb, inode, GFP_NOFS);
}

extern void inode_init_once(struct inode *);
extern void address_space_init_once(struct address_space *mapping);
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
extern int inode_needs_sync(struct inode *inode);
extern int generic_delete_inode(struct inode *inode);
static inline int generic_drop_inode(struct inode *inode)
{
	return !inode->i_nlink || inode_unhashed(inode);
}
extern 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)
{
	return (u32)ino == 0;
}

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

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) kmem_cache_alloc_lru(_cache, &_sb->s_inode_lru, _gfp)

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

extern void __remove_inode_hash(struct inode *);
static inline void remove_inode_hash(struct inode *inode)
{
	if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash))
		__remove_inode_hash(inode);
}

extern void inode_sb_list_add(struct inode *inode);
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
typedef 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);
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 (*)(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 *);
struct inode *anon_inode_make_secure_inode(struct super_block *sb, const char *name,
					   const struct inode *context_inode);
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 { 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);

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);
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);

#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, 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);
}
#else
static inline bool generic_ci_validate_strict_name(struct inode *dir, struct qstr *name)
{
	return true;
}
#endif

static inline bool sb_has_encoding(const struct super_block *sb)
{
#if IS_ENABLED(CONFIG_UNICODE)
	return !!sb->s_encoding;
#else
	return false;
#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 vma_is_dax(const struct vm_area_struct *vma)
{
	return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
}

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);

struct ctl_table;
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)
{
	return ctx->actor(ctx, name, namelen, ctx->pos, ino, type);
}
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);

#endif /* _LINUX_FS_H */

Filemanager

Name Type Size Permission Actions
amba Folder 0755
atomic Folder 0755
avf Folder 0755
bcma Folder 0755
bus Folder 0755
byteorder Folder 0755
can Folder 0755
cdx Folder 0755
ceph Folder 0755
clk Folder 0755
comedi Folder 0755
crush Folder 0755
decompress Folder 0755
device Folder 0755
dma Folder 0755
dsa Folder 0755
extcon Folder 0755
firmware Folder 0755
fpga Folder 0755
framer Folder 0755
fsl Folder 0755
gpio Folder 0755
greybus Folder 0755
habanalabs Folder 0755
hsi Folder 0755
i3c Folder 0755
iio Folder 0755
input Folder 0755
io_uring Folder 0755
irqchip Folder 0755
isdn Folder 0755
lockd Folder 0755
lsm Folder 0755
mailbox Folder 0755
mdio Folder 0755
memory Folder 0755
mfd Folder 0755
misc Folder 0755
mlx4 Folder 0755
mlx5 Folder 0755
mmc Folder 0755
mtd Folder 0755
mux Folder 0755
net Folder 0755
netfilter Folder 0755
netfilter_arp Folder 0755
netfilter_bridge Folder 0755
netfilter_ipv4 Folder 0755
netfilter_ipv6 Folder 0755
pcs Folder 0755
pds Folder 0755
perf Folder 0755
phy Folder 0755
pinctrl Folder 0755
platform_data Folder 0755
power Folder 0755
pse-pd Folder 0755
pwrseq Folder 0755
qat Folder 0755
qed Folder 0755
raid Folder 0755
regulator Folder 0755
remoteproc Folder 0755
reset Folder 0755
rpmsg Folder 0755
rtc Folder 0755
sched Folder 0755
soc Folder 0755
soundwire Folder 0755
spi Folder 0755
ssb Folder 0755
sunrpc Folder 0755
surface_aggregator Folder 0755
ulpi Folder 0755
unaligned Folder 0755
usb Folder 0755
8250_pci.h File 1.01 KB 0644
acct.h File 2.45 KB 0644
acpi.h File 44.88 KB 0644
acpi_amd_wbrf.h File 2.24 KB 0644
acpi_dma.h File 2.95 KB 0644
acpi_iort.h File 2.64 KB 0644
acpi_mdio.h File 819 B 0644
acpi_pmtmr.h File 1.02 KB 0644
acpi_viot.h File 478 B 0644
adb.h File 1.79 KB 0644
adfs_fs.h File 574 B 0644
adreno-smmu-priv.h File 3.15 KB 0644
adxl.h File 310 B 0644
aer.h File 1.49 KB 0644
agp_backend.h File 3.45 KB 0644
agpgart.h File 3.79 KB 0644
ahci-remap.h File 607 B 0644
ahci_platform.h File 1.81 KB 0644
aio.h File 570 B 0644
alarmtimer.h File 1.83 KB 0644
alcor_pci.h File 8.74 KB 0644
align.h File 552 B 0644
alloc_tag.h File 6.4 KB 0644
altera_jtaguart.h File 379 B 0644
altera_uart.h File 397 B 0644
amd-iommu.h File 2.12 KB 0644
amd-pmf-io.h File 1.58 KB 0644
anon_inodes.h File 1021 B 0644
aperture.h File 1.61 KB 0644
apm-emulation.h File 1.56 KB 0644
apm_bios.h File 2.25 KB 0644
apple-gmux.h File 4.63 KB 0644
arch_topology.h File 2.93 KB 0644
args.h File 1021 B 0644
arm-cci.h File 1.39 KB 0644
arm-smccc.h File 20.7 KB 0644
arm_ffa.h File 14.71 KB 0644
arm_sdei.h File 2.67 KB 0644
armada-37xx-rwtm-mailbox.h File 431 B 0644
array_size.h File 332 B 0644
ascii85.h File 555 B 0644
asn1.h File 1.79 KB 0644
asn1_ber_bytecode.h File 2.52 KB 0644
asn1_decoder.h File 493 B 0644
asn1_encoder.h File 983 B 0644
assoc_array.h File 2.88 KB 0644
assoc_array_priv.h File 5.3 KB 0644
async.h File 4.36 KB 0644
async_tx.h File 6.7 KB 0644
ata.h File 30.39 KB 0644
ata_platform.h File 755 B 0644
atalk.h File 4.45 KB 0644
atm.h File 287 B 0644
atm_tcp.h File 542 B 0644
atmdev.h File 10.17 KB 0644
atmel-isc-media.h File 2.07 KB 0644
atmel-ssc.h File 9.74 KB 0644
atmel_pdc.h File 1.26 KB 0644
atomic.h File 2.58 KB 0644
attribute_container.h File 2.47 KB 0644
audit.h File 20.48 KB 0644
audit_arch.h File 559 B 0644
auto_dev-ioctl.h File 296 B 0644
auto_fs.h File 278 B 0644
auxiliary_bus.h File 10.33 KB 0644
auxvec.h File 304 B 0644
average.h File 2.42 KB 0644
backing-dev-defs.h File 8.4 KB 0644
backing-dev.h File 10.41 KB 0644
backing-file.h File 1.51 KB 0644
backlight.h File 11.9 KB 0644
badblocks.h File 2.66 KB 0644
balloon_compaction.h File 6 KB 0644
base64.h File 370 B 0644
bcd.h File 683 B 0644
bch.h File 2.1 KB 0644
bcm47xx_nvram.h File 1.2 KB 0644
bcm47xx_sprom.h File 616 B 0644
bcm47xx_wdt.h File 555 B 0644
bcm963xx_nvram.h File 2.96 KB 0644
bcm963xx_tag.h File 3.6 KB 0644
binfmts.h File 4.63 KB 0644
bio-integrity.h File 4.16 KB 0644
bio.h File 18.01 KB 0644
bit_spinlock.h File 2.3 KB 0644
bitfield.h File 6.39 KB 0644
bitmap-str.h File 842 B 0644
bitmap.h File 29.11 KB 0644
bitops.h File 10.14 KB 0644
bitrev.h File 2.53 KB 0644
bits.h File 1.57 KB 0644
blk-cgroup.h File 1.53 KB 0644
blk-crypto-profile.h File 5.3 KB 0644
blk-crypto.h File 4.13 KB 0644
blk-integrity.h File 3.99 KB 0644
blk-mq.h File 33.72 KB 0644
blk-pm.h File 647 B 0644
blk_types.h File 15.31 KB 0644
blkdev.h File 49.82 KB 0644
blkpg.h File 436 B 0644
blktrace_api.h File 3.55 KB 0644
blockgroup_lock.h File 810 B 0644
bma150.h File 1.25 KB 0644
bootconfig.h File 9.27 KB 0644
bootmem_info.h File 2.04 KB 0644
bottom_half.h File 1013 B 0644
bpf-cgroup-defs.h File 2.07 KB 0644
bpf-cgroup.h File 18.4 KB 0644
bpf-netns.h File 1.41 KB 0644
bpf.h File 110.52 KB 0644
bpf_crypto.h File 865 B 0644
bpf_lirc.h File 698 B 0644
bpf_local_storage.h File 6.61 KB 0644
bpf_lsm.h File 2.01 KB 0644
bpf_mem_alloc.h File 2.05 KB 0644
bpf_mprog.h File 9.29 KB 0644
bpf_trace.h File 166 B 0644
bpf_types.h File 6.1 KB 0644
bpf_verifier.h File 33.06 KB 0644
bpfptr.h File 2.09 KB 0644
brcmphy.h File 21.77 KB 0644
bsearch.h File 624 B 0644
bsg-lib.h File 1.71 KB 0644
bsg.h File 499 B 0644
btf.h File 20.05 KB 0644
btf_ids.h File 8.18 KB 0644
btree-128.h File 2.67 KB 0644
btree-type.h File 3.9 KB 0644
btree.h File 6.84 KB 0644
btrfs.h File 145 B 0644
buffer_head.h File 17.37 KB 0644
bug.h File 2.33 KB 0644
build-salt.h File 375 B 0644
build_bug.h File 2.99 KB 0644
buildid.h File 671 B 0644
bvec.h File 7.54 KB 0644
c2port.h File 1.35 KB 0644
cache.h File 5.51 KB 0644
cacheflush.h File 675 B 0644
cacheinfo.h File 4.92 KB 0644
call_once.h File 1.67 KB 0644
capability.h File 6.27 KB 0644
cb710.h File 5.36 KB 0644
cc_platform.h File 3.42 KB 0644
cciss_ioctl.h File 1.03 KB 0644
ccp.h File 18.14 KB 0644
cdev.h File 845 B 0644
cdrom.h File 8.92 KB 0644
cfag12864b.h File 1.07 KB 0644
cfi.h File 1.23 KB 0644
cfi_types.h File 1.06 KB 0644
cgroup-defs.h File 26.77 KB 0644
cgroup.h File 26.33 KB 0644
cgroup_api.h File 26 B 0644
cgroup_dmem.h File 1.91 KB 0644
cgroup_rdma.h File 1.18 KB 0644
cgroup_refcnt.h File 2.59 KB 0644
cgroup_subsys.h File 1.28 KB 0644
circ_buf.h File 1.09 KB 0644
cleanup.h File 13.45 KB 0644
clk-provider.h File 65.77 KB 0644
clk.h File 36.18 KB 0644
clkdev.h File 1.2 KB 0644
clockchips.h File 7.29 KB 0644
clocksource.h File 11.01 KB 0644
clocksource_ids.h File 333 B 0644
closure.h File 14.22 KB 0644
cma.h File 2.26 KB 0644
cmpxchg-emu.h File 435 B 0644
cn_proc.h File 1.85 KB 0644
cnt32_to_63.h File 3.46 KB 0644
coda.h File 2.16 KB 0644
codetag.h File 3.4 KB 0644
compaction.h File 4.5 KB 0644
compat.h File 32.32 KB 0644
compiler-clang.h File 4.13 KB 0644
compiler-gcc.h File 3.92 KB 0644
compiler-version.h File 517 B 0644
compiler.h File 12.26 KB 0644
compiler_attributes.h File 15.91 KB 0644
compiler_types.h File 18.79 KB 0644
completion.h File 4.14 KB 0644
component.h File 4.35 KB 0644
configfs.h File 8.54 KB 0644
connector.h File 4.01 KB 0644
console.h File 24.18 KB 0644
console_struct.h File 6.98 KB 0644
consolemap.h File 1.25 KB 0644
const.h File 100 B 0644
container.h File 616 B 0644
container_of.h File 1.3 KB 0644
context_tracking.h File 4.4 KB 0644
context_tracking_irq.h File 633 B 0644
context_tracking_state.h File 3.8 KB 0644
cookie.h File 1.22 KB 0644
cordic.h File 2.08 KB 0644
coredump.h File 2.17 KB 0644
coresight-pmu.h File 2.32 KB 0644
coresight-stm.h File 152 B 0644
coresight.h File 22.68 KB 0644
count_zeros.h File 1.42 KB 0644
counter.h File 21.48 KB 0644
cper.h File 17.59 KB 0644
cpu.h File 6.67 KB 0644
cpu_cooling.h File 1.83 KB 0644
cpu_pm.h File 2.38 KB 0644
cpu_rmap.h File 1.7 KB 0644
cpu_smt.h File 1.12 KB 0644
cpufeature.h File 1.71 KB 0644
cpufreq.h File 36.37 KB 0644
cpuhotplug.h File 16.95 KB 0644
cpuhplock.h File 1.52 KB 0644
cpuidle.h File 11.42 KB 0644
cpuidle_haltpoll.h File 312 B 0644
cpumask.h File 37.26 KB 0644
cpumask_api.h File 27 B 0644
cpumask_types.h File 2.18 KB 0644
cpuset.h File 8.01 KB 0644
crash_core.h File 2.65 KB 0644
crash_dump.h File 6.29 KB 0644
crash_reserve.h File 1.33 KB 0644
crc-ccitt.h File 369 B 0644
crc-itu-t.h File 530 B 0644
crc-t10dif.h File 759 B 0644
crc16.h File 540 B 0644
crc32.h File 4.23 KB 0644
crc32c.h File 346 B 0644
crc32poly.h File 610 B 0644
crc4.h File 192 B 0644
crc64.h File 539 B 0644
crc7.h File 316 B 0644
crc8.h File 3.66 KB 0644
cred.h File 11.95 KB 0644
crypto.h File 19.01 KB 0644
cs5535.h File 6.13 KB 0644
ctype.h File 1.87 KB 0644
cuda.h File 620 B 0644
damon.h File 33.47 KB 0644
dasd_mod.h File 204 B 0644
davinci_emac.h File 1.05 KB 0644
dax.h File 8.75 KB 0644
dca.h File 1.88 KB 0644
dcache.h File 18.81 KB 0644
dccp.h File 10.74 KB 0644
debug_locks.h File 1.57 KB 0644
debugfs.h File 15.87 KB 0644
debugobjects.h File 4.09 KB 0644
delay.h File 4.18 KB 0644
delayacct.h File 7.08 KB 0644
delayed_call.h File 709 B 0644
dev_printk.h File 9.74 KB 0644
devcoredump.h File 3.53 KB 0644
devfreq-event.h File 5.95 KB 0644
devfreq.h File 14.52 KB 0644
devfreq_cooling.h File 2.7 KB 0644
device-mapper.h File 21.11 KB 0644
device.h File 43.19 KB 0644
device_cgroup.h File 1.57 KB 0644
devm-helpers.h File 2.67 KB 0644
devpts_fs.h File 1.13 KB 0644
dfl.h File 2.72 KB 0644
digsig.h File 1.18 KB 0644
dim.h File 12.69 KB 0644
dio.h File 10.77 KB 0644
dirent.h File 215 B 0644
dlm.h File 6.44 KB 0644
dlm_plock.h File 642 B 0644
dm-bufio.h File 5.16 KB 0644
dm-dirty-log.h File 4 KB 0644
dm-io.h File 2.03 KB 0644
dm-kcopyd.h File 3.03 KB 0644
dm-region-hash.h File 3.16 KB 0644
dm-verity-loadpin.h File 617 B 0644
dm9000.h File 987 B 0644
dma-buf.h File 21.21 KB 0644
dma-direct.h File 4.16 KB 0644
dma-direction.h File 407 B 0644
dma-fence-array.h File 2.86 KB 0644
dma-fence-chain.h File 3.66 KB 0644
dma-fence-unwrap.h File 2.24 KB 0644
dma-fence.h File 22.94 KB 0644
dma-heap.h File 1.13 KB 0644
dma-map-ops.h File 15.89 KB 0644
dma-mapping.h File 21.19 KB 0644
dma-resv.h File 16.94 KB 0644
dmaengine.h File 55.21 KB 0644
dmapool.h File 1.79 KB 0644
dmar.h File 8.06 KB 0644
dmi.h File 4.27 KB 0644
dnotify.h File 1012 B 0644
dns_resolver.h File 1.36 KB 0644
dpll.h File 6.78 KB 0644
dqblk_qtree.h File 2.19 KB 0644
dqblk_v1.h File 327 B 0644
dqblk_v2.h File 406 B 0644
drbd.h File 9.92 KB 0644
drbd_config.h File 285 B 0644
drbd_genl.h File 21.49 KB 0644
drbd_genl_api.h File 1.76 KB 0644
drbd_limits.h File 7.92 KB 0644
ds2782_battery.h File 158 B 0644
dtlk.h File 3.5 KB 0644
dtpm.h File 1.46 KB 0644
dw_apb_timer.h File 1.32 KB 0644
dynamic_debug.h File 10.96 KB 0644
dynamic_queue_limits.h File 5.43 KB 0644
earlycpio.h File 359 B 0644
ecryptfs.h File 3.82 KB 0644
edac.h File 19.44 KB 0644
edd.h File 1.05 KB 0644
eeprom_93cx6.h File 2.64 KB 0644
efi-bgrt.h File 644 B 0644
efi.h File 44.59 KB 0644
efi_embedded_fw.h File 1.04 KB 0644
efs_vh.h File 1.55 KB 0644
eisa.h File 2.97 KB 0644
elf-fdpic.h File 2.39 KB 0644
elf-randomize.h File 583 B 0644
elf.h File 2.97 KB 0644
elfcore-compat.h File 1.43 KB 0644
elfcore.h File 3.93 KB 0644
elfnote-lto.h File 314 B 0644
elfnote.h File 3.54 KB 0644
enclosure.h File 4.02 KB 0644
energy_model.h File 13.12 KB 0644
entry-common.h File 18.62 KB 0644
entry-kvm.h File 2.77 KB 0644
err.h File 3.35 KB 0644
errname.h File 283 B 0644
errno.h File 1.45 KB 0644
error-injection.h File 630 B 0644
errqueue.h File 524 B 0644
errseq.h File 382 B 0644
etherdevice.h File 19.37 KB 0644
ethtool.h File 52.71 KB 0644
ethtool_netlink.h File 3.74 KB 0644
eventfd.h File 2.1 KB 0644
eventpoll.h File 2.41 KB 0644
evm.h File 2.12 KB 0644
execmem.h File 5.72 KB 0644
export-internal.h File 2.3 KB 0644
export.h File 2.67 KB 0644
exportfs.h File 11.19 KB 0644
ext2_fs.h File 967 B 0644
extable.h File 1.28 KB 0644
extcon-provider.h File 3.83 KB 0644
extcon.h File 9.99 KB 0644
f2fs_fs.h File 20.26 KB 0644
f75375s.h File 541 B 0644
falloc.h File 1.79 KB 0644
fanotify.h File 4.99 KB 0644
fault-inject-usercopy.h File 496 B 0644
fault-inject.h File 3.07 KB 0644
fb.h File 30.04 KB 0644
fbcon.h File 2.09 KB 0644
fcdevice.h File 774 B 0644
fcntl.h File 1.66 KB 0644
fd.h File 490 B 0644
fddidevice.h File 833 B 0644
fdtable.h File 3.08 KB 0644
fec.h File 463 B 0644
fiemap.h File 831 B 0644
file.h File 3.66 KB 0644
file_ref.h File 5.46 KB 0644
fileattr.h File 1.9 KB 0644
filelock.h File 13.17 KB 0644
filter.h File 48.89 KB 0644
find.h File 20.71 KB 0644
fips.h File 303 B 0644
firewire.h File 17.27 KB 0644
firmware-map.h File 959 B 0644
firmware.h File 6.3 KB 0644
fixp-arith.h File 4.21 KB 0644
flat.h File 2.57 KB 0644
flex_proportions.h File 1.98 KB 0644
folio_queue.h File 9.99 KB 0644
font.h File 1.7 KB 0644
fortify-string.h File 28.64 KB 0644
fprobe.h File 3.92 KB 0644
fpu.h File 246 B 0644
freezer.h File 2.34 KB 0644
fs.h File 129.11 KB 0644
fs_api.h File 22 B 0644
fs_context.h File 8.36 KB 0644
fs_parser.h File 5.01 KB 0644
fs_pin.h File 539 B 0644
fs_stack.h File 895 B 0644
fs_struct.h File 1.04 KB 0644
fs_types.h File 2.02 KB 0644
fscache-cache.h File 7.09 KB 0644
fscache.h File 24.09 KB 0644
fscrypt.h File 34.57 KB 0644
fsi-occ.h File 715 B 0644
fsi-sbefifo.h File 629 B 0644
fsi.h File 2.27 KB 0644
fsl-diu-fb.h File 3.87 KB 0644
fsl_devices.h File 4.16 KB 0644
fsl_hypervisor.h File 2.76 KB 0644
fsl_ifc.h File 24.48 KB 0644
fsldma.h File 202 B 0644
fsnotify.h File 13.17 KB 0644
fsnotify_backend.h File 31.2 KB 0644
fsverity.h File 9.29 KB 0644
ftrace.h File 43.74 KB 0644
ftrace_irq.h File 884 B 0644
ftrace_regs.h File 1.31 KB 0644
futex.h File 2.44 KB 0644
fw_table.h File 1.75 KB 0644
fwnode.h File 7.81 KB 0644
fwnode_mdio.h File 858 B 0644
gameport.h File 5.24 KB 0644
gcd.h File 193 B 0644
genalloc.h File 7.68 KB 0644
generic-radix-tree.h File 11.43 KB 0644
genl_magic_func.h File 11.67 KB 0644
genl_magic_struct.h File 7.58 KB 0644
getcpu.h File 641 B 0644
gfp.h File 14.84 KB 0644
gfp_api.h File 23 B 0644
gfp_types.h File 16.57 KB 0644
glob.h File 256 B 0644
gnss.h File 1.56 KB 0644
goldfish.h File 878 B 0644
gpio-pxa.h File 571 B 0644
gpio.h File 5.01 KB 0644
gpio_keys.h File 1.81 KB 0644
greybus.h File 3.57 KB 0644
group_cpus.h File 310 B 0644
hardirq.h File 3.25 KB 0644
hash.h File 2.93 KB 0644
hashtable.h File 6.67 KB 0644
hashtable_api.h File 29 B 0644
hdlc.h File 3.19 KB 0644
hdlcdrv.h File 6.32 KB 0644
hdmi.h File 12.84 KB 0644
hex.h File 884 B 0644
hid-debug.h File 1.42 KB 0644
hid-over-i2c.h File 3.53 KB 0644
hid-over-spi.h File 4.91 KB 0644
hid-roccat.h File 490 B 0644
hid-sensor-hub.h File 8.97 KB 0644
hid-sensor-ids.h File 7.85 KB 0644
hid.h File 39.52 KB 0644
hid_bpf.h File 8.19 KB 0644
hidden.h File 966 B 0644
hiddev.h File 1.42 KB 0644
hidraw.h File 1.13 KB 0644
highmem-internal.h File 6.62 KB 0644
highmem.h File 18.61 KB 0644
highuid.h File 3.12 KB 0644
hil.h File 18.42 KB 0644
hil_mlc.h File 5.13 KB 0644
hippidevice.h File 1.08 KB 0644
hisi_acc_qm.h File 14.13 KB 0644
hmm.h File 3.93 KB 0644
host1x.h File 13.67 KB 0644
host1x_context_bus.h File 337 B 0644
hp_sdc.h File 14.01 KB 0644
hpet.h File 2.55 KB 0644
hrtimer.h File 11.36 KB 0644
hrtimer_api.h File 27 B 0644
hrtimer_defs.h File 4.22 KB 0644
hrtimer_types.h File 1.53 KB 0644
hte.h File 7.37 KB 0644
huge_mm.h File 18.87 KB 0644
hugetlb.h File 36.03 KB 0644
hugetlb_cgroup.h File 6.78 KB 0644
hugetlb_inline.h File 374 B 0644
hw_breakpoint.h File 4.19 KB 0644
hw_random.h File 2.23 KB 0644
hwmon-sysfs.h File 2.8 KB 0644
hwmon-vid.h File 862 B 0644
hwmon.h File 15.94 KB 0644
hwspinlock.h File 15.79 KB 0644
hyperv.h File 49.31 KB 0644
hypervisor.h File 748 B 0644
i2c-algo-bit.h File 1.4 KB 0644
i2c-algo-pca.h File 2.89 KB 0644
i2c-algo-pcf.h File 1.21 KB 0644
i2c-atr.h File 3.95 KB 0644
i2c-dev.h File 371 B 0644
i2c-mux.h File 1.61 KB 0644
i2c-of-prober.h File 4.94 KB 0644
i2c-smbus.h File 1.69 KB 0644
i2c.h File 39.67 KB 0644
i8042.h File 2.45 KB 0644
i8253.h File 808 B 0644
i8254.h File 489 B 0644
icmp.h File 1 KB 0644
icmpv6.h File 2.87 KB 0644
idle_inject.h File 1.02 KB 0644
idr.h File 9.72 KB 0644
ieee80211.h File 180.45 KB 0644
ieee802154.h File 14.46 KB 0644
if_arp.h File 1.81 KB 0644
if_bridge.h File 5.42 KB 0644
if_eql.h File 1.13 KB 0644
if_ether.h File 1.26 KB 0644
if_fddi.h File 3.24 KB 0644
if_hsr.h File 1.5 KB 0644
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