fs.h 108.9 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_FS_H
#define _LINUX_FS_H

#include <linux/linkage.h>
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#include <linux/wait_bit.h>
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#include <linux/kdev_t.h>
#include <linux/dcache.h>
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#include <linux/path.h>
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#include <linux/stat.h>
#include <linux/cache.h>
#include <linux/list.h>
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#include <linux/list_lru.h>
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#include <linux/llist.h>
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#include <linux/radix-tree.h>
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#include <linux/rbtree.h>
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#include <linux/init.h>
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#include <linux/pid.h>
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#include <linux/bug.h>
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/mm_types.h>
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#include <linux/capability.h>
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#include <linux/semaphore.h>
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#include <linux/fcntl.h>
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#include <linux/fiemap.h>
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#include <linux/rculist_bl.h>
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#include <linux/atomic.h>
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#include <linux/shrinker.h>
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#include <linux/migrate_mode.h>
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#include <linux/uidgid.h>
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#include <linux/lockdep.h>
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#include <linux/percpu-rwsem.h>
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#include <linux/workqueue.h>
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#include <linux/delayed_call.h>
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#include <linux/uuid.h>
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#include <linux/errseq.h>
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#include <asm/byteorder.h>
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#include <uapi/linux/fs.h>
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struct backing_dev_info;
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struct bdi_writeback;
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struct bio;
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struct export_operations;
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struct hd_geometry;
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struct iovec;
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struct kiocb;
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struct kobject;
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struct pipe_inode_info;
struct poll_table_struct;
struct kstatfs;
struct vm_area_struct;
struct vfsmount;
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struct cred;
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struct swap_info_struct;
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struct seq_file;
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struct workqueue_struct;
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struct iov_iter;
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struct fscrypt_info;
struct fscrypt_operations;
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extern void __init inode_init(void);
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extern void __init inode_init_early(void);
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extern void __init files_init(void);
extern void __init files_maxfiles_init(void);
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extern struct files_stat_struct files_stat;
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extern unsigned long get_max_files(void);
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extern unsigned int sysctl_nr_open;
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extern struct inodes_stat_t inodes_stat;
extern int leases_enable, lease_break_time;
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extern int sysctl_protected_symlinks;
extern int sysctl_protected_hardlinks;
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typedef __kernel_rwf_t rwf_t;

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struct buffer_head;
typedef int (get_block_t)(struct inode *inode, sector_t iblock,
			struct buffer_head *bh_result, int create);
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typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
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			ssize_t bytes, void *private);
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#define MAY_EXEC		0x00000001
#define MAY_WRITE		0x00000002
#define MAY_READ		0x00000004
#define MAY_APPEND		0x00000008
#define MAY_ACCESS		0x00000010
#define MAY_OPEN		0x00000020
#define MAY_CHDIR		0x00000040
/* called from RCU mode, don't block */
#define MAY_NOT_BLOCK		0x00000080

/*
 * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
 */

/* file is open for reading */
#define FMODE_READ		((__force fmode_t)0x1)
/* file is open for writing */
#define FMODE_WRITE		((__force fmode_t)0x2)
/* file is seekable */
#define FMODE_LSEEK		((__force fmode_t)0x4)
/* file can be accessed using pread */
#define FMODE_PREAD		((__force fmode_t)0x8)
/* file can be accessed using pwrite */
#define FMODE_PWRITE		((__force fmode_t)0x10)
/* File is opened for execution with sys_execve / sys_uselib */
#define FMODE_EXEC		((__force fmode_t)0x20)
/* File is opened with O_NDELAY (only set for block devices) */
#define FMODE_NDELAY		((__force fmode_t)0x40)
/* File is opened with O_EXCL (only set for block devices) */
#define FMODE_EXCL		((__force fmode_t)0x80)
/* File is opened using open(.., 3, ..) and is writeable only for ioctls
   (specialy hack for floppy.c) */
#define FMODE_WRITE_IOCTL	((__force fmode_t)0x100)
/* 32bit hashes as llseek() offset (for directories) */
#define FMODE_32BITHASH         ((__force fmode_t)0x200)
/* 64bit hashes as llseek() offset (for directories) */
#define FMODE_64BITHASH         ((__force fmode_t)0x400)

/*
 * Don't update ctime and mtime.
 *
 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
 */
#define FMODE_NOCMTIME		((__force fmode_t)0x800)

/* Expect random access pattern */
#define FMODE_RANDOM		((__force fmode_t)0x1000)

/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
#define FMODE_UNSIGNED_OFFSET	((__force fmode_t)0x2000)

/* File is opened with O_PATH; almost nothing can be done with it */
#define FMODE_PATH		((__force fmode_t)0x4000)

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/* File needs atomic accesses to f_pos */
#define FMODE_ATOMIC_POS	((__force fmode_t)0x8000)
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/* Write access to underlying fs */
#define FMODE_WRITER		((__force fmode_t)0x10000)
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/* Has read method(s) */
#define FMODE_CAN_READ          ((__force fmode_t)0x20000)
/* Has write method(s) */
#define FMODE_CAN_WRITE         ((__force fmode_t)0x40000)
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/* File was opened by fanotify and shouldn't generate fanotify events */
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#define FMODE_NONOTIFY		((__force fmode_t)0x4000000)
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/* File is capable of returning -EAGAIN if I/O will block */
#define FMODE_NOWAIT	((__force fmode_t)0x8000000)
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/*
 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
 * that indicates that they should check the contents of the iovec are
 * valid, but not check the memory that the iovec elements
 * points too.
 */
#define CHECK_IOVEC_ONLY -1

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/*
 * Attribute flags.  These should be or-ed together to figure out what
 * has been changed!
 */
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#define ATTR_MODE	(1 << 0)
#define ATTR_UID	(1 << 1)
#define ATTR_GID	(1 << 2)
#define ATTR_SIZE	(1 << 3)
#define ATTR_ATIME	(1 << 4)
#define ATTR_MTIME	(1 << 5)
#define ATTR_CTIME	(1 << 6)
#define ATTR_ATIME_SET	(1 << 7)
#define ATTR_MTIME_SET	(1 << 8)
#define ATTR_FORCE	(1 << 9) /* Not a change, but a change it */
#define ATTR_ATTR_FLAG	(1 << 10)
#define ATTR_KILL_SUID	(1 << 11)
#define ATTR_KILL_SGID	(1 << 12)
#define ATTR_FILE	(1 << 13)
#define ATTR_KILL_PRIV	(1 << 14)
#define ATTR_OPEN	(1 << 15) /* Truncating from open(O_TRUNC) */
#define ATTR_TIMES_SET	(1 << 16)
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#define ATTR_TOUCH	(1 << 17)
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/*
 * 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

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/*
 * This is the Inode Attributes structure, used for notify_change().  It
 * uses the above definitions as flags, to know which values have changed.
 * Also, in this manner, a Filesystem can look at only the values it cares
 * about.  Basically, these are the attributes that the VFS layer can
 * request to change from the FS layer.
 *
 * Derek Atkins <warlord@MIT.EDU> 94-10-20
 */
struct iattr {
	unsigned int	ia_valid;
	umode_t		ia_mode;
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	kuid_t		ia_uid;
	kgid_t		ia_gid;
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	loff_t		ia_size;
	struct timespec	ia_atime;
	struct timespec	ia_mtime;
	struct timespec	ia_ctime;
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	/*
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	 * Not an attribute, but an auxiliary info for filesystems wanting to
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	 * implement an ftruncate() like method.  NOTE: filesystem should
	 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
	 */
	struct file	*ia_file;
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};

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

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

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/** 
 * 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
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 *  			by readpage().
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 *
 * 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,
};

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#define AOP_FLAG_CONT_EXPAND		0x0001 /* called from cont_expand */
#define AOP_FLAG_NOFS			0x0002 /* used by filesystem to direct
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						* helper code (eg buffer layer)
						* to clear GFP_FS from alloc */
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/*
 * oh the beauties of C type declarations.
 */
struct page;
struct address_space;
struct writeback_control;

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/*
 * Write life time hint values.
 */
enum rw_hint {
	WRITE_LIFE_NOT_SET	= 0,
	WRITE_LIFE_NONE		= RWH_WRITE_LIFE_NONE,
	WRITE_LIFE_SHORT	= RWH_WRITE_LIFE_SHORT,
	WRITE_LIFE_MEDIUM	= RWH_WRITE_LIFE_MEDIUM,
	WRITE_LIFE_LONG		= RWH_WRITE_LIFE_LONG,
	WRITE_LIFE_EXTREME	= RWH_WRITE_LIFE_EXTREME,
};

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#define IOCB_EVENTFD		(1 << 0)
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#define IOCB_APPEND		(1 << 1)
#define IOCB_DIRECT		(1 << 2)
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#define IOCB_HIPRI		(1 << 3)
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#define IOCB_DSYNC		(1 << 4)
#define IOCB_SYNC		(1 << 5)
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#define IOCB_WRITE		(1 << 6)
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#define IOCB_NOWAIT		(1 << 7)
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struct kiocb {
	struct file		*ki_filp;
	loff_t			ki_pos;
	void (*ki_complete)(struct kiocb *iocb, long ret, long ret2);
	void			*private;
	int			ki_flags;
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	enum rw_hint		ki_hint;
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} __randomize_layout;
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static inline bool is_sync_kiocb(struct kiocb *kiocb)
{
	return kiocb->ki_complete == NULL;
}

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/*
 * "descriptor" for what we're up to with a read.
 * This allows us to use the same read code yet
 * have multiple different users of the data that
 * we read from a file.
 *
 * The simplest case just copies the data to user
 * mode.
 */
typedef struct {
	size_t written;
	size_t count;
	union {
		char __user *buf;
		void *data;
	} arg;
	int error;
} read_descriptor_t;

typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
		unsigned long, unsigned long);
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struct address_space_operations {
	int (*writepage)(struct page *page, struct writeback_control *wbc);
	int (*readpage)(struct file *, struct page *);

	/* Write back some dirty pages from this mapping. */
	int (*writepages)(struct address_space *, struct writeback_control *);

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	/* Set a page dirty.  Return true if this dirtied it */
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	int (*set_page_dirty)(struct page *page);

	int (*readpages)(struct file *filp, struct address_space *mapping,
			struct list_head *pages, unsigned nr_pages);

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	int (*write_begin)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);
	int (*write_end)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

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	/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
	sector_t (*bmap)(struct address_space *, sector_t);
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	void (*invalidatepage) (struct page *, unsigned int, unsigned int);
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	int (*releasepage) (struct page *, gfp_t);
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	void (*freepage)(struct page *);
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	ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter);
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	/*
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	 * migrate the contents of a page to the specified target. If
	 * migrate_mode is MIGRATE_ASYNC, it must not block.
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	 */
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	int (*migratepage) (struct address_space *,
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			struct page *, struct page *, enum migrate_mode);
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	bool (*isolate_page)(struct page *, isolate_mode_t);
	void (*putback_page)(struct page *);
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	int (*launder_page) (struct page *);
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	int (*is_partially_uptodate) (struct page *, unsigned long,
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					unsigned long);
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	void (*is_dirty_writeback) (struct page *, bool *, bool *);
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	int (*error_remove_page)(struct address_space *, struct page *);
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	/* swapfile support */
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	int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
				sector_t *span);
	void (*swap_deactivate)(struct file *file);
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};

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extern const struct address_space_operations empty_aops;

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/*
 * pagecache_write_begin/pagecache_write_end must be used by general code
 * to write into the pagecache.
 */
int pagecache_write_begin(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);

int pagecache_write_end(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

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struct address_space {
	struct inode		*host;		/* owner: inode, block_device */
	struct radix_tree_root	page_tree;	/* radix tree of all pages */
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	spinlock_t		tree_lock;	/* and lock protecting it */
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	atomic_t		i_mmap_writable;/* count VM_SHARED mappings */
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	struct rb_root_cached	i_mmap;		/* tree of private and shared mappings */
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	struct rw_semaphore	i_mmap_rwsem;	/* protect tree, count, list */
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	/* Protected by tree_lock together with the radix tree */
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	unsigned long		nrpages;	/* number of total pages */
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	/* number of shadow or DAX exceptional entries */
	unsigned long		nrexceptional;
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	pgoff_t			writeback_index;/* writeback starts here */
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	const struct address_space_operations *a_ops;	/* methods */
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	unsigned long		flags;		/* error bits */
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	spinlock_t		private_lock;	/* for use by the address_space */
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	gfp_t			gfp_mask;	/* implicit gfp mask for allocations */
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	struct list_head	private_list;	/* for use by the address_space */
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	void			*private_data;	/* ditto */
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	errseq_t		wb_err;
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} __attribute__((aligned(sizeof(long)))) __randomize_layout;
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	/*
	 * On most architectures that alignment is already the case; but
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	 * must be enforced here for CRIS, to let the least significant bit
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	 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
	 */
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struct request_queue;
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struct block_device {
	dev_t			bd_dev;  /* not a kdev_t - it's a search key */
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	int			bd_openers;
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	struct inode *		bd_inode;	/* will die */
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	struct super_block *	bd_super;
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	struct mutex		bd_mutex;	/* open/close mutex */
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	void *			bd_claiming;
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	void *			bd_holder;
	int			bd_holders;
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	bool			bd_write_holder;
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#ifdef CONFIG_SYSFS
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	struct list_head	bd_holder_disks;
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#endif
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	struct block_device *	bd_contains;
	unsigned		bd_block_size;
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	u8			bd_partno;
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	struct hd_struct *	bd_part;
	/* number of times partitions within this device have been opened. */
	unsigned		bd_part_count;
	int			bd_invalidated;
	struct gendisk *	bd_disk;
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	struct request_queue *  bd_queue;
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	struct backing_dev_info *bd_bdi;
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	struct list_head	bd_list;
	/*
	 * Private data.  You must have bd_claim'ed the block_device
	 * to use this.  NOTE:  bd_claim allows an owner to claim
	 * the same device multiple times, the owner must take special
	 * care to not mess up bd_private for that case.
	 */
	unsigned long		bd_private;
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	/* The counter of freeze processes */
	int			bd_fsfreeze_count;
	/* Mutex for freeze */
	struct mutex		bd_fsfreeze_mutex;
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} __randomize_layout;
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/*
 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
 * radix trees
 */
#define PAGECACHE_TAG_DIRTY	0
#define PAGECACHE_TAG_WRITEBACK	1
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#define PAGECACHE_TAG_TOWRITE	2
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int mapping_tagged(struct address_space *mapping, int tag);

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static inline void i_mmap_lock_write(struct address_space *mapping)
{
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	down_write(&mapping->i_mmap_rwsem);
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}

static inline void i_mmap_unlock_write(struct address_space *mapping)
{
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	up_write(&mapping->i_mmap_rwsem);
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}

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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);
}

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/*
 * Might pages of this file be mapped into userspace?
 */
static inline int mapping_mapped(struct address_space *mapping)
{
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	return	!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root);
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}

/*
 * Might pages of this file have been modified in userspace?
 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
 * marks vma as VM_SHARED if it is shared, and the file was opened for
 * writing i.e. vma may be mprotected writable even if now readonly.
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 *
 * If i_mmap_writable is negative, no new writable mappings are allowed. You
 * can only deny writable mappings, if none exists right now.
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 */
static inline int mapping_writably_mapped(struct address_space *mapping)
{
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	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);
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}

/*
 * 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

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struct posix_acl;
#define ACL_NOT_CACHED ((void *)(-1))
543
#define ACL_DONT_CACHE ((void *)(-3))
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545 546 547 548 549 550 551 552 553 554 555 556
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;
}

557 558 559
#define IOP_FASTPERM	0x0001
#define IOP_LOOKUP	0x0002
#define IOP_NOFOLLOW	0x0004
560
#define IOP_XATTR	0x0008
561
#define IOP_DEFAULT_READLINK	0x0010
562

563 564
struct fsnotify_mark_connector;

565 566 567 568 569
/*
 * Keep mostly read-only and often accessed (especially for
 * the RCU path lookup and 'stat' data) fields at the beginning
 * of the 'struct inode'
 */
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struct inode {
571
	umode_t			i_mode;
572
	unsigned short		i_opflags;
573 574
	kuid_t			i_uid;
	kgid_t			i_gid;
575 576 577 578 579 580 581
	unsigned int		i_flags;

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

582 583
	const struct inode_operations	*i_op;
	struct super_block	*i_sb;
584
	struct address_space	*i_mapping;
585

586 587 588
#ifdef CONFIG_SECURITY
	void			*i_security;
#endif
589

590 591
	/* Stat data, not accessed from path walking */
	unsigned long		i_ino;
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	/*
	 * 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;
	};
603
	dev_t			i_rdev;
604
	loff_t			i_size;
605 606 607
	struct timespec		i_atime;
	struct timespec		i_mtime;
	struct timespec		i_ctime;
608 609
	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
	unsigned short          i_bytes;
610
	unsigned int		i_blkbits;
611
	enum rw_hint		i_write_hint;
612 613 614 615 616 617 618 619
	blkcnt_t		i_blocks;

#ifdef __NEED_I_SIZE_ORDERED
	seqcount_t		i_size_seqcount;
#endif

	/* Misc */
	unsigned long		i_state;
620
	struct rw_semaphore	i_rwsem;
621

622
	unsigned long		dirtied_when;	/* jiffies of first dirtying */
623
	unsigned long		dirtied_time_when;
624

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	struct hlist_node	i_hash;
626
	struct list_head	i_io_list;	/* backing dev IO list */
627 628
#ifdef CONFIG_CGROUP_WRITEBACK
	struct bdi_writeback	*i_wb;		/* the associated cgroup wb */
629 630 631 632 633

	/* foreign inode detection, see wbc_detach_inode() */
	int			i_wb_frn_winner;
	u16			i_wb_frn_avg_time;
	u16			i_wb_frn_history;
634
#endif
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	struct list_head	i_lru;		/* inode LRU list */
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	struct list_head	i_sb_list;
637
	struct list_head	i_wb_list;	/* backing dev writeback list */
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	union {
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		struct hlist_head	i_dentry;
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		struct rcu_head		i_rcu;
	};
642
	atomic64_t		i_version;
643
	atomic_t		i_count;
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	atomic_t		i_dio_count;
645
	atomic_t		i_writecount;
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#ifdef CONFIG_IMA
	atomic_t		i_readcount; /* struct files open RO */
#endif
649
	const struct file_operations	*i_fop;	/* former ->i_op->default_file_ops */
650
	struct file_lock_context	*i_flctx;
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	struct address_space	i_data;
	struct list_head	i_devices;
653 654
	union {
		struct pipe_inode_info	*i_pipe;
655
		struct block_device	*i_bdev;
656
		struct cdev		*i_cdev;
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		char			*i_link;
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		unsigned		i_dir_seq;
659
	};
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	__u32			i_generation;

663 664
#ifdef CONFIG_FSNOTIFY
	__u32			i_fsnotify_mask; /* all events this inode cares about */
665
	struct fsnotify_mark_connector __rcu	*i_fsnotify_marks;
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#endif

668 669 670 671
#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
	struct fscrypt_info	*i_crypt_info;
#endif

672
	void			*i_private; /* fs or device private pointer */
673
} __randomize_layout;
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static inline unsigned int i_blocksize(const struct inode *node)
{
	return (1 << node->i_blkbits);
}

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static inline int inode_unhashed(struct inode *inode)
{
	return hlist_unhashed(&inode->i_hash);
}

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/*
 * inode->i_mutex nesting subclasses for the lock validator:
 *
 * 0: the object of the current VFS operation
 * 1: parent
 * 2: child/target
691 692
 * 3: xattr
 * 4: second non-directory
693 694 695
 * 5: second parent (when locking independent directories in rename)
 *
 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
696
 * non-directories at once.
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 *
 * The locking order between these classes is
699
 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
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 */
enum inode_i_mutex_lock_class
{
	I_MUTEX_NORMAL,
	I_MUTEX_PARENT,
	I_MUTEX_CHILD,
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	I_MUTEX_XATTR,
707 708
	I_MUTEX_NONDIR2,
	I_MUTEX_PARENT2,
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};

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static inline void inode_lock(struct inode *inode)
{
713
	down_write(&inode->i_rwsem);
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}

static inline void inode_unlock(struct inode *inode)
{
718 719 720 721 722 723 724 725 726 727 728
	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);
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}

static inline int inode_trylock(struct inode *inode)
{
733 734 735 736 737 738
	return down_write_trylock(&inode->i_rwsem);
}

static inline int inode_trylock_shared(struct inode *inode)
{
	return down_read_trylock(&inode->i_rwsem);
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}

static inline int inode_is_locked(struct inode *inode)
{
743
	return rwsem_is_locked(&inode->i_rwsem);
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}

static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
{
748
	down_write_nested(&inode->i_rwsem, subclass);
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}

751 752 753
void lock_two_nondirectories(struct inode *, struct inode*);
void unlock_two_nondirectories(struct inode *, struct inode*);

L
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/*
 * 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.
 */
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static inline loff_t i_size_read(const struct inode *inode)
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{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	loff_t i_size;
	unsigned int seq;

	do {
		seq = read_seqcount_begin(&inode->i_size_seqcount);
		i_size = inode->i_size;
	} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
	return i_size;
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	loff_t i_size;

	preempt_disable();
	i_size = inode->i_size;
	preempt_enable();
	return i_size;
#else
	return inode->i_size;
#endif
}

787 788 789 790 791
/*
 * 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.
 */
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static inline void i_size_write(struct inode *inode, loff_t i_size)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
795
	preempt_disable();
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	write_seqcount_begin(&inode->i_size_seqcount);
	inode->i_size = i_size;
	write_seqcount_end(&inode->i_size_seqcount);
799
	preempt_enable();
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#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	preempt_disable();
	inode->i_size = i_size;
	preempt_enable();
#else
	inode->i_size = i_size;
#endif
}

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static inline unsigned iminor(const struct inode *inode)
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{
	return MINOR(inode->i_rdev);
}

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static inline unsigned imajor(const struct inode *inode)
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{
	return MAJOR(inode->i_rdev);
}

extern struct block_device *I_BDEV(struct inode *inode);

struct fown_struct {
	rwlock_t lock;          /* protects pid, uid, euid fields */
823 824
	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 */
825
	kuid_t uid, euid;	/* uid/euid of process setting the owner */
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	int signum;		/* posix.1b rt signal to be delivered on IO */
};

/*
 * Track a single file's readahead state
 */
struct file_ra_state {
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	pgoff_t start;			/* where readahead started */
	unsigned int size;		/* # of readahead pages */
	unsigned int async_size;	/* do asynchronous readahead when
836
					   there are only # of pages ahead */
837

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	unsigned int ra_pages;		/* Maximum readahead window */
839
	unsigned int mmap_miss;		/* Cache miss stat for mmap accesses */
840
	loff_t prev_pos;		/* Cache last read() position */
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};

843 844 845 846 847
/*
 * Check if @index falls in the readahead windows.
 */
static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
{
848 849
	return (index >= ra->start &&
		index <  ra->start + ra->size);
850 851
}

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struct file {
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853
	union {
854
		struct llist_node	fu_llist;
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855 856
		struct rcu_head 	fu_rcuhead;
	} f_u;
857
	struct path		f_path;
858
	struct inode		*f_inode;	/* cached value */
859
	const struct file_operations	*f_op;
860 861

	/*
862
	 * Protects f_ep_links, f_flags.
863 864 865
	 * Must not be taken from IRQ context.
	 */
	spinlock_t		f_lock;
866
	enum rw_hint		f_write_hint;
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	atomic_long_t		f_count;
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868
	unsigned int 		f_flags;
869
	fmode_t			f_mode;
870
	struct mutex		f_pos_lock;
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	loff_t			f_pos;
	struct fown_struct	f_owner;
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873
	const struct cred	*f_cred;
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874 875
	struct file_ra_state	f_ra;

876
	u64			f_version;
877
#ifdef CONFIG_SECURITY
L
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878
	void			*f_security;
879
#endif
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	/* needed for tty driver, and maybe others */
	void			*private_data;

#ifdef CONFIG_EPOLL
	/* Used by fs/eventpoll.c to link all the hooks to this file */
	struct list_head	f_ep_links;
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	struct list_head	f_tfile_llink;
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#endif /* #ifdef CONFIG_EPOLL */
	struct address_space	*f_mapping;
889
	errseq_t		f_wb_err;
890 891
} __randomize_layout
  __attribute__((aligned(4)));	/* lest something weird decides that 2 is OK */
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893 894 895 896 897 898 899
struct file_handle {
	__u32 handle_bytes;
	int handle_type;
	/* file identifier */
	unsigned char f_handle[0];
};

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static inline struct file *get_file(struct file *f)
{
	atomic_long_inc(&f->f_count);
	return f;
}
905
#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
906
#define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
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#define file_count(x)	atomic_long_read(&(x)->f_count)
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#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
914
#define MAX_LFS_FILESIZE	((loff_t)ULONG_MAX << PAGE_SHIFT)
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#elif BITS_PER_LONG==64
916
#define MAX_LFS_FILESIZE 	((loff_t)LLONG_MAX)
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917 918 919 920
#endif

#define FL_POSIX	1
#define FL_FLOCK	2
921
#define FL_DELEG	4	/* NFSv4 delegation */
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922
#define FL_ACCESS	8	/* not trying to lock, just looking */
923
#define FL_EXISTS	16	/* when unlocking, test for existence */
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924
#define FL_LEASE	32	/* lease held on this file */
925
#define FL_CLOSE	64	/* unlock on close */
L
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926
#define FL_SLEEP	128	/* A blocking lock */
927 928
#define FL_DOWNGRADE_PENDING	256 /* Lease is being downgraded */
#define FL_UNLOCK_PENDING	512 /* Lease is being broken */
929
#define FL_OFDLCK	1024	/* lock is "owned" by struct file */
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Christoph Hellwig 已提交
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#define FL_LAYOUT	2048	/* outstanding pNFS layout */
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931

932 933
#define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE)

934 935 936 937 938 939
/*
 * Special return value from posix_lock_file() and vfs_lock_file() for
 * asynchronous locking.
 */
#define FILE_LOCK_DEFERRED 1

940
/* legacy typedef, should eventually be removed */
941
typedef void *fl_owner_t;
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942

943 944
struct file_lock;

L
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945 946 947 948 949 950
struct file_lock_operations {
	void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
	void (*fl_release_private)(struct file_lock *);
};

struct lock_manager_operations {
J
J. Bruce Fields 已提交
951
	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
952
	unsigned long (*lm_owner_key)(struct file_lock *);
953 954
	fl_owner_t (*lm_get_owner)(fl_owner_t);
	void (*lm_put_owner)(fl_owner_t);
J
J. Bruce Fields 已提交
955
	void (*lm_notify)(struct file_lock *);	/* unblock callback */
956
	int (*lm_grant)(struct file_lock *, int);
J
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957
	bool (*lm_break)(struct file_lock *);
958
	int (*lm_change)(struct file_lock *, int, struct list_head *);
959
	void (*lm_setup)(struct file_lock *, void **);
L
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};

962 963
struct lock_manager {
	struct list_head list;
964 965 966 967 968
	/*
	 * NFSv4 and up also want opens blocked during the grace period;
	 * NLM doesn't care:
	 */
	bool block_opens;
969 970
};

971 972
struct net;
void locks_start_grace(struct net *, struct lock_manager *);
973
void locks_end_grace(struct lock_manager *);
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bool locks_in_grace(struct net *);
bool opens_in_grace(struct net *);
976

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/* that will die - we need it for nfs_lock_info */
#include <linux/nfs_fs_i.h>

980 981 982 983 984 985 986 987 988
/*
 * struct file_lock represents a generic "file lock". It's used to represent
 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
 * note that the same struct is used to represent both a request for a lock and
 * the lock itself, but the same object is never used for both.
 *
 * FIXME: should we create a separate "struct lock_request" to help distinguish
 * these two uses?
 *
989
 * The varous i_flctx lists are ordered by:
990
 *
991 992 993
 * 1) lock owner
 * 2) lock range start
 * 3) lock range end
994 995 996
 *
 * Obviously, the last two criteria only matter for POSIX locks.
 */
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struct file_lock {
	struct file_lock *fl_next;	/* singly linked list for this inode  */
999
	struct list_head fl_list;	/* link into file_lock_context */
1000
	struct hlist_node fl_link;	/* node in global lists */
L
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	struct list_head fl_block;	/* circular list of blocked processes */
	fl_owner_t fl_owner;
1003
	unsigned int fl_flags;
1004
	unsigned char fl_type;
L
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1005
	unsigned int fl_pid;
1006
	int fl_link_cpu;		/* what cpu's list is this on? */
L
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1007 1008 1009 1010 1011 1012
	wait_queue_head_t fl_wait;
	struct file *fl_file;
	loff_t fl_start;
	loff_t fl_end;

	struct fasync_struct *	fl_fasync; /* for lease break notifications */
1013 1014 1015
	/* for lease breaks: */
	unsigned long fl_break_time;
	unsigned long fl_downgrade_time;
L
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1016

1017
	const struct file_lock_operations *fl_ops;	/* Callbacks for filesystems */
1018
	const struct lock_manager_operations *fl_lmops;	/* Callbacks for lockmanagers */
L
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1019 1020
	union {
		struct nfs_lock_info	nfs_fl;
1021
		struct nfs4_lock_info	nfs4_fl;
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1022 1023 1024 1025
		struct {
			struct list_head link;	/* link in AFS vnode's pending_locks list */
			int state;		/* state of grant or error if -ve */
		} afs;
L
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1026
	} fl_u;
1027
} __randomize_layout;
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1028

1029
struct file_lock_context {
1030
	spinlock_t		flc_lock;
1031
	struct list_head	flc_flock;
1032
	struct list_head	flc_posix;
1033
	struct list_head	flc_lease;
1034 1035
};

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/* The following constant reflects the upper bound of the file/locking space */
#ifndef OFFSET_MAX
#define INT_LIMIT(x)	(~((x)1 << (sizeof(x)*8 - 1)))
#define OFFSET_MAX	INT_LIMIT(loff_t)
#define OFFT_OFFSET_MAX	INT_LIMIT(off_t)
#endif

1043 1044
extern void send_sigio(struct fown_struct *fown, int fd, int band);

1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
/*
 * Return the inode to use for locking
 *
 * For overlayfs this should be the overlay inode, not the real inode returned
 * by file_inode().  For any other fs file_inode(filp) and locks_inode(filp) are
 * equal.
 */
static inline struct inode *locks_inode(const struct file *f)
{
	return f->f_path.dentry->d_inode;
}

1057
#ifdef CONFIG_FILE_LOCKING
1058
extern int fcntl_getlk(struct file *, unsigned int, struct flock *);
1059
extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1060
			struct flock *);
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1061 1062

#if BITS_PER_LONG == 32
1063
extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *);
1064
extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1065
			struct flock64 *);
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#endif

extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
extern int fcntl_getlease(struct file *filp);

/* fs/locks.c */
1072
void locks_free_lock_context(struct inode *inode);
1073
void locks_free_lock(struct file_lock *fl);
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1074
extern void locks_init_lock(struct file_lock *);
1075
extern struct file_lock * locks_alloc_lock(void);
L
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1076
extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1077
extern void locks_copy_conflock(struct file_lock *, struct file_lock *);
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1078
extern void locks_remove_posix(struct file *, fl_owner_t);
1079
extern void locks_remove_file(struct file *);
1080
extern void locks_release_private(struct file_lock *);
1081
extern void posix_test_lock(struct file *, struct file_lock *);
1082
extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1083
extern int posix_unblock_lock(struct file_lock *);
1084
extern int vfs_test_lock(struct file *, struct file_lock *);
1085
extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
M
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1086
extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1087
extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
J
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extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
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1089
extern void lease_get_mtime(struct inode *, struct timespec *time);
1090 1091
extern int generic_setlease(struct file *, long, struct file_lock **, void **priv);
extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
1092
extern int lease_modify(struct file_lock *, int, struct list_head *);
1093 1094 1095
struct files_struct;
extern void show_fd_locks(struct seq_file *f,
			 struct file *filp, struct files_struct *files);
1096
#else /* !CONFIG_FILE_LOCKING */
1097 1098
static inline int fcntl_getlk(struct file *file, unsigned int cmd,
			      struct flock __user *user)
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
{
	return -EINVAL;
}

static inline int fcntl_setlk(unsigned int fd, struct file *file,
			      unsigned int cmd, struct flock __user *user)
{
	return -EACCES;
}

1109
#if BITS_PER_LONG == 32
1110 1111
static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
				struct flock64 __user *user)
1112 1113 1114 1115 1116 1117 1118 1119 1120
{
	return -EINVAL;
}

static inline int fcntl_setlk64(unsigned int fd, struct file *file,
				unsigned int cmd, struct flock64 __user *user)
{
	return -EACCES;
}
1121
#endif
1122 1123
static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
{
1124
	return -EINVAL;
1125 1126 1127 1128
}

static inline int fcntl_getlease(struct file *filp)
{
1129
	return F_UNLCK;
1130 1131
}

1132
static inline void
1133
locks_free_lock_context(struct inode *inode)
1134 1135 1136
{
}

1137 1138 1139 1140 1141
static inline void locks_init_lock(struct file_lock *fl)
{
	return;
}

1142
static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
{
	return;
}

static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
	return;
}

static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
{
	return;
}

1157
static inline void locks_remove_file(struct file *filp)
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
{
	return;
}

static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
{
	return;
}

static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
				  struct file_lock *conflock)
{
	return -ENOLCK;
}

1173
static inline int posix_unblock_lock(struct file_lock *waiter)
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
{
	return -ENOENT;
}

static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
				struct file_lock *fl, struct file_lock *conf)
{
	return -ENOLCK;
}

static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

1194 1195 1196 1197 1198
static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl)
{
	return -ENOLCK;
}

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1199
static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
{
	return 0;
}

static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
{
	return;
}

static inline int generic_setlease(struct file *filp, long arg,
1210
				    struct file_lock **flp, void **priv)
1211 1212 1213 1214 1215
{
	return -EINVAL;
}

static inline int vfs_setlease(struct file *filp, long arg,
1216
			       struct file_lock **lease, void **priv)
1217 1218 1219 1220
{
	return -EINVAL;
}

1221
static inline int lease_modify(struct file_lock *fl, int arg,
1222
			       struct list_head *dispose)
1223 1224 1225
{
	return -EINVAL;
}
1226 1227 1228 1229

struct files_struct;
static inline void show_fd_locks(struct seq_file *f,
			struct file *filp, struct files_struct *files) {}
1230 1231
#endif /* !CONFIG_FILE_LOCKING */

1232 1233 1234 1235 1236
static inline struct inode *file_inode(const struct file *f)
{
	return f->f_inode;
}

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1237 1238
static inline struct dentry *file_dentry(const struct file *file)
{
M
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1239
	return d_real(file->f_path.dentry, file_inode(file), 0, 0);
M
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1240 1241
}

1242 1243
static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
{
1244
	return locks_lock_inode_wait(locks_inode(filp), fl);
1245 1246
}

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1247
struct fasync_struct {
1248 1249 1250 1251 1252 1253
	spinlock_t		fa_lock;
	int			magic;
	int			fa_fd;
	struct fasync_struct	*fa_next; /* singly linked list */
	struct file		*fa_file;
	struct rcu_head		fa_rcu;
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};

#define FASYNC_MAGIC 0x4601

/* SMP safe fasync helpers: */
extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1260 1261 1262 1263 1264
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 *);

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/* can be called from interrupts */
extern void kill_fasync(struct fasync_struct **, int, int);

1268
extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1269
extern int f_setown(struct file *filp, unsigned long arg, int force);
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extern void f_delown(struct file *filp);
1271
extern pid_t f_getown(struct file *filp);
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extern int send_sigurg(struct fown_struct *fown);

1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
/*
 * sb->s_flags.  Note that these mirror the equivalent MS_* flags where
 * represented in both.
 */
#define SB_RDONLY	 1	/* Mount read-only */
#define SB_NOSUID	 2	/* Ignore suid and sgid bits */
#define SB_NODEV	 4	/* Disallow access to device special files */
#define SB_NOEXEC	 8	/* Disallow program execution */
#define SB_SYNCHRONOUS	16	/* Writes are synced at once */
#define SB_MANDLOCK	64	/* Allow mandatory locks on an FS */
#define SB_DIRSYNC	128	/* Directory modifications are synchronous */
#define SB_NOATIME	1024	/* Do not update access times. */
#define SB_NODIRATIME	2048	/* Do not update directory access times */
#define SB_SILENT	32768
#define SB_POSIXACL	(1<<16)	/* VFS does not apply the umask */
#define SB_KERNMOUNT	(1<<22) /* this is a kern_mount call */
#define SB_I_VERSION	(1<<23) /* Update inode I_version field */
#define SB_LAZYTIME	(1<<25) /* Update the on-disk [acm]times lazily */

/* These sb flags are internal to the kernel */
#define SB_SUBMOUNT     (1<<26)
#define SB_NOREMOTELOCK	(1<<27)
#define SB_NOSEC	(1<<28)
#define SB_BORN		(1<<29)
#define SB_ACTIVE	(1<<30)
#define SB_NOUSER	(1<<31)

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/*
 *	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 */
1308 1309
#define UMOUNT_NOFOLLOW	0x00000008	/* Don't follow symlink on umount */
#define UMOUNT_UNUSED	0x80000000	/* Flag guaranteed to be unused */
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1311 1312
/* sb->s_iflags */
#define SB_I_CGROUPWB	0x00000001	/* cgroup-aware writeback enabled */
1313
#define SB_I_NOEXEC	0x00000002	/* Ignore executables on this fs */
1314
#define SB_I_NODEV	0x00000004	/* Ignore devices on this fs */
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1316 1317
/* sb->s_iflags to limit user namespace mounts */
#define SB_I_USERNS_VISIBLE		0x00000010 /* fstype already mounted */
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1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
/* 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 {
1332 1333 1334
	int				frozen;		/* Is sb frozen? */
	wait_queue_head_t		wait_unfrozen;	/* for get_super_thawed() */
	struct percpu_rw_semaphore	rw_sem[SB_FREEZE_LEVELS];
1335 1336
};

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struct super_block {
	struct list_head	s_list;		/* Keep this first */
	dev_t			s_dev;		/* search index; _not_ kdev_t */
1340 1341
	unsigned char		s_blocksize_bits;
	unsigned long		s_blocksize;
1342
	loff_t			s_maxbytes;	/* Max file size */
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	struct file_system_type	*s_type;
1344
	const struct super_operations	*s_op;
1345
	const struct dquot_operations	*dq_op;
1346
	const struct quotactl_ops	*s_qcop;
1347
	const struct export_operations *s_export_op;
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1348
	unsigned long		s_flags;
1349
	unsigned long		s_iflags;	/* internal SB_I_* flags */
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	unsigned long		s_magic;
	struct dentry		*s_root;
	struct rw_semaphore	s_umount;
	int			s_count;
	atomic_t		s_active;
1355
#ifdef CONFIG_SECURITY
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	void                    *s_security;
1357
#endif
1358
	const struct xattr_handler **s_xattr;
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1360 1361
	const struct fscrypt_operations	*s_cop;

1362
	struct hlist_bl_head	s_roots;	/* alternate root dentries for NFS */
1363
	struct list_head	s_mounts;	/* list of mounts; _not_ for fs use */
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	struct block_device	*s_bdev;
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1365
	struct backing_dev_info *s_bdi;
1366
	struct mtd_info		*s_mtd;
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	struct hlist_node	s_instances;
1368
	unsigned int		s_quota_types;	/* Bitmask of supported quota types */
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	struct quota_info	s_dquot;	/* Diskquota specific options */

1371
	struct sb_writers	s_writers;
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1373 1374
	char			s_id[32];	/* Informational name */
	uuid_t			s_uuid;		/* UUID */
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	void 			*s_fs_info;	/* Filesystem private info */
1377
	unsigned int		s_max_links;
1378
	fmode_t			s_mode;
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1380 1381 1382 1383
	/* Granularity of c/m/atime in ns.
	   Cannot be worse than a second */
	u32		   s_time_gran;

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	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
1388
	struct mutex s_vfs_rename_mutex;	/* Kludge */
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	/*
	 * Filesystem subtype.  If non-empty the filesystem type field
	 * in /proc/mounts will be "type.subtype"
	 */
	char *s_subtype;
1395

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	const struct dentry_operations *s_d_op; /* default d_op for dentries */
1397 1398 1399 1400 1401

	/*
	 * Saved pool identifier for cleancache (-1 means none)
	 */
	int cleancache_poolid;
1402 1403

	struct shrinker s_shrink;	/* per-sb shrinker handle */
1404

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

1408 1409
	/* Being remounted read-only */
	int s_readonly_remount;
1410 1411 1412

	/* AIO completions deferred from interrupt context */
	struct workqueue_struct *s_dio_done_wq;
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	struct hlist_head s_pins;
1414

1415 1416 1417 1418 1419 1420 1421
	/*
	 * 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;

1422 1423 1424 1425 1426 1427
	/*
	 * Keep the lru lists last in the structure so they always sit on their
	 * own individual cachelines.
	 */
	struct list_lru		s_dentry_lru ____cacheline_aligned_in_smp;
	struct list_lru		s_inode_lru ____cacheline_aligned_in_smp;
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	struct rcu_head		rcu;
1429
	struct work_struct	destroy_work;
1430

1431
	struct mutex		s_sync_lock;	/* sync serialisation lock */
1432 1433 1434 1435 1436

	/*
	 * Indicates how deep in a filesystem stack this SB is
	 */
	int s_stack_depth;
1437 1438 1439 1440

	/* s_inode_list_lock protects s_inodes */
	spinlock_t		s_inode_list_lock ____cacheline_aligned_in_smp;
	struct list_head	s_inodes;	/* all inodes */
1441 1442 1443

	spinlock_t		s_inode_wblist_lock;
	struct list_head	s_inodes_wb;	/* writeback inodes */
1444
} __randomize_layout;
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1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
/* 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(inode->i_sb->s_user_ns, inode->i_uid);
}

static inline gid_t i_gid_read(const struct inode *inode)
{
	return from_kgid(inode->i_sb->s_user_ns, inode->i_gid);
}

static inline void i_uid_write(struct inode *inode, uid_t uid)
{
	inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid);
}

static inline void i_gid_write(struct inode *inode, gid_t gid)
{
	inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid);
}

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1471
extern struct timespec current_time(struct inode *inode);
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/*
 * Snapshotting support.
 */

1477 1478 1479
void __sb_end_write(struct super_block *sb, int level);
int __sb_start_write(struct super_block *sb, int level, bool wait);

1480
#define __sb_writers_acquired(sb, lev)	\
1481
	percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1482
#define __sb_writers_release(sb, lev)	\
1483
	percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1484

1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
/**
 * sb_end_write - drop write access to a superblock
 * @sb: the super we wrote to
 *
 * Decrement number of writers to the filesystem. Wake up possible waiters
 * wanting to freeze the filesystem.
 */
static inline void sb_end_write(struct super_block *sb)
{
	__sb_end_write(sb, SB_FREEZE_WRITE);
}

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

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

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

static inline int sb_start_write_trylock(struct super_block *sb)
{
	return __sb_start_write(sb, SB_FREEZE_WRITE, false);
}

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

/*
 * sb_start_intwrite - get write access to a superblock for internal fs purposes
 * @sb: the super we write to
 *
 * This is the third level of protection against filesystem freezing. It is
 * free for use by a filesystem. The only requirement is that it must rank
 * below sb_start_pagefault.
 *
 * For example filesystem can call sb_start_intwrite() when starting a
 * transaction which somewhat eases handling of freezing for internal sources
 * of filesystem changes (internal fs threads, discarding preallocation on file
 * close, etc.).
 */
static inline void sb_start_intwrite(struct super_block *sb)
{
	__sb_start_write(sb, SB_FREEZE_FS, true);
}
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1593
extern bool inode_owner_or_capable(const struct inode *inode);
1594

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/*
 * VFS helper functions..
 */
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extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
1599
extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
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extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
1601
extern int vfs_symlink(struct inode *, struct dentry *, const char *);
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extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **);
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extern int vfs_rmdir(struct inode *, struct dentry *);
1604
extern int vfs_unlink(struct inode *, struct dentry *, struct inode **);
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extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int);
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extern int vfs_whiteout(struct inode *, struct dentry *);
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1608 1609 1610
extern struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode,
				  int open_flag);

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1611 1612 1613 1614
int vfs_mkobj(struct dentry *, umode_t,
		int (*f)(struct dentry *, umode_t, void *),
		void *);

1615 1616 1617
/*
 * VFS file helper functions.
 */
1618
extern void inode_init_owner(struct inode *inode, const struct inode *dir,
A
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1619
			umode_t mode);
1620
extern bool may_open_dev(const struct path *path);
M
Mark Fasheh 已提交
1621 1622 1623 1624 1625 1626 1627
/*
 * VFS FS_IOC_FIEMAP helper definitions.
 */
struct fiemap_extent_info {
	unsigned int fi_flags;		/* Flags as passed from user */
	unsigned int fi_extents_mapped;	/* Number of mapped extents */
	unsigned int fi_extents_max;	/* Size of fiemap_extent array */
1628 1629
	struct fiemap_extent __user *fi_extents_start; /* Start of
							fiemap_extent array */
M
Mark Fasheh 已提交
1630 1631 1632 1633 1634
};
int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
			    u64 phys, u64 len, u32 flags);
int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);

L
Linus Torvalds 已提交
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
/*
 * File types
 *
 * NOTE! These match bits 12..15 of stat.st_mode
 * (ie "(i_mode >> 12) & 15").
 */
#define DT_UNKNOWN	0
#define DT_FIFO		1
#define DT_CHR		2
#define DT_DIR		4
#define DT_BLK		6
#define DT_REG		8
#define DT_LNK		10
#define DT_SOCK		12
#define DT_WHT		14

/*
 * This is the "filldir" function type, used by readdir() to let
 * the kernel specify what kind of dirent layout it wants to have.
 * This allows the kernel to read directories into kernel space or
 * to have different dirent layouts depending on the binary type.
 */
1657 1658 1659 1660
struct dir_context;
typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64,
			 unsigned);

1661
struct dir_context {
A
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1662
	const filldir_t actor;
1663
	loff_t pos;
1664
};
1665

1666
struct block_device_operations;
L
Linus Torvalds 已提交
1667 1668 1669 1670 1671 1672 1673

/* These macros are for out of kernel modules to test that
 * the kernel supports the unlocked_ioctl and compat_ioctl
 * fields in struct file_operations. */
#define HAVE_COMPAT_IOCTL 1
#define HAVE_UNLOCKED_IOCTL 1

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
/*
 * 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)


1694 1695
struct iov_iter;

L
Linus Torvalds 已提交
1696 1697 1698 1699 1700
struct file_operations {
	struct module *owner;
	loff_t (*llseek) (struct file *, loff_t, int);
	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1701 1702
	ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
	ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
1703
	int (*iterate) (struct file *, struct dir_context *);
1704
	int (*iterate_shared) (struct file *, struct dir_context *);
A
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1705
	__poll_t (*poll) (struct file *, struct poll_table_struct *);
L
Linus Torvalds 已提交
1706 1707 1708
	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 *);
1709
	unsigned long mmap_supported_flags;
L
Linus Torvalds 已提交
1710
	int (*open) (struct inode *, struct file *);
1711
	int (*flush) (struct file *, fl_owner_t id);
L
Linus Torvalds 已提交
1712
	int (*release) (struct inode *, struct file *);
1713
	int (*fsync) (struct file *, loff_t, loff_t, int datasync);
L
Linus Torvalds 已提交
1714 1715 1716 1717 1718 1719
	int (*fasync) (int, struct file *, int);
	int (*lock) (struct file *, int, struct file_lock *);
	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
	int (*check_flags)(int);
	int (*flock) (struct file *, int, struct file_lock *);
1720 1721
	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);
1722
	int (*setlease)(struct file *, long, struct file_lock **, void **);
1723 1724
	long (*fallocate)(struct file *file, int mode, loff_t offset,
			  loff_t len);
1725
	void (*show_fdinfo)(struct seq_file *m, struct file *f);
1726 1727 1728
#ifndef CONFIG_MMU
	unsigned (*mmap_capabilities)(struct file *);
#endif
1729 1730 1731 1732
	ssize_t (*copy_file_range)(struct file *, loff_t, struct file *,
			loff_t, size_t, unsigned int);
	int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t,
			u64);
1733 1734
	ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *,
			u64);
1735
} __randomize_layout;
L
Linus Torvalds 已提交
1736 1737

struct inode_operations {
A
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1738
	struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
1739
	const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *);
1740
	int (*permission) (struct inode *, int);
1741
	struct posix_acl * (*get_acl)(struct inode *, int);
1742 1743 1744

	int (*readlink) (struct dentry *, char __user *,int);

A
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1745
	int (*create) (struct inode *,struct dentry *, umode_t, bool);
L
Linus Torvalds 已提交
1746 1747 1748
	int (*link) (struct dentry *,struct inode *,struct dentry *);
	int (*unlink) (struct inode *,struct dentry *);
	int (*symlink) (struct inode *,struct dentry *,const char *);
1749
	int (*mkdir) (struct inode *,struct dentry *,umode_t);
L
Linus Torvalds 已提交
1750
	int (*rmdir) (struct inode *,struct dentry *);
A
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1751
	int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
L
Linus Torvalds 已提交
1752
	int (*rename) (struct inode *, struct dentry *,
M
Miklos Szeredi 已提交
1753
			struct inode *, struct dentry *, unsigned int);
L
Linus Torvalds 已提交
1754
	int (*setattr) (struct dentry *, struct iattr *);
1755
	int (*getattr) (const struct path *, struct kstat *, u32, unsigned int);
L
Linus Torvalds 已提交
1756
	ssize_t (*listxattr) (struct dentry *, char *, size_t);
M
Mark Fasheh 已提交
1757 1758
	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
		      u64 len);
1759
	int (*update_time)(struct inode *, struct timespec *, int);
A
Al Viro 已提交
1760
	int (*atomic_open)(struct inode *, struct dentry *,
A
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1761
			   struct file *, unsigned open_flag,
A
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1762
			   umode_t create_mode, int *opened);
1763
	int (*tmpfile) (struct inode *, struct dentry *, umode_t);
1764
	int (*set_acl)(struct inode *, struct posix_acl *, int);
1765
} ____cacheline_aligned;
L
Linus Torvalds 已提交
1766

1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778
static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio,
				     struct iov_iter *iter)
{
	return file->f_op->read_iter(kio, iter);
}

static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio,
				      struct iov_iter *iter)
{
	return file->f_op->write_iter(kio, iter);
}

1779 1780 1781 1782 1783
static inline int call_mmap(struct file *file, struct vm_area_struct *vma)
{
	return file->f_op->mmap(file, vma);
}

B
Badari Pulavarty 已提交
1784
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
C
Christopher Yeoh 已提交
1785 1786
			      unsigned long nr_segs, unsigned long fast_segs,
			      struct iovec *fast_pointer,
1787
			      struct iovec **ret_pointer);
B
Badari Pulavarty 已提交
1788

D
Dmitry Kasatkin 已提交
1789
extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
L
Linus Torvalds 已提交
1790 1791 1792
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
C
Christoph Hellwig 已提交
1793
		unsigned long, loff_t *, rwf_t);
1794 1795
extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
				   loff_t, size_t, unsigned int);
1796 1797 1798
extern int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in,
				      struct inode *inode_out, loff_t pos_out,
				      u64 *len, bool is_dedupe);
1799 1800
extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
		struct file *file_out, loff_t pos_out, u64 len);
1801 1802 1803
extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff,
					 struct inode *dest, loff_t destoff,
					 loff_t len, bool *is_same);
1804 1805
extern int vfs_dedupe_file_range(struct file *file,
				 struct file_dedupe_range *same);
L
Linus Torvalds 已提交
1806 1807 1808 1809 1810

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

1811
   	void (*dirty_inode) (struct inode *, int flags);
1812
	int (*write_inode) (struct inode *, struct writeback_control *wbc);
1813
	int (*drop_inode) (struct inode *);
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Al Viro 已提交
1814
	void (*evict_inode) (struct inode *);
L
Linus Torvalds 已提交
1815 1816
	void (*put_super) (struct super_block *);
	int (*sync_fs)(struct super_block *sb, int wait);
1817
	int (*freeze_super) (struct super_block *);
1818
	int (*freeze_fs) (struct super_block *);
1819
	int (*thaw_super) (struct super_block *);
1820
	int (*unfreeze_fs) (struct super_block *);
1821
	int (*statfs) (struct dentry *, struct kstatfs *);
L
Linus Torvalds 已提交
1822
	int (*remount_fs) (struct super_block *, int *, char *);
1823
	void (*umount_begin) (struct super_block *);
L
Linus Torvalds 已提交
1824

1825
	int (*show_options)(struct seq_file *, struct dentry *);
1826
	int (*show_devname)(struct seq_file *, struct dentry *);
1827
	int (*show_path)(struct seq_file *, struct dentry *);
1828
	int (*show_stats)(struct seq_file *, struct dentry *);
1829
#ifdef CONFIG_QUOTA
L
Linus Torvalds 已提交
1830 1831
	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);
1832
	struct dquot **(*get_dquots)(struct inode *);
1833
#endif
1834
	int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1835 1836 1837 1838
	long (*nr_cached_objects)(struct super_block *,
				  struct shrink_control *);
	long (*free_cached_objects)(struct super_block *,
				    struct shrink_control *);
L
Linus Torvalds 已提交
1839 1840
};

D
David Howells 已提交
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
/*
 * Inode flags - they have no relation to superblock flags now
 */
#define S_SYNC		1	/* Writes are synced at once */
#define S_NOATIME	2	/* Do not update access times */
#define S_APPEND	4	/* Append-only file */
#define S_IMMUTABLE	8	/* Immutable file */
#define S_DEAD		16	/* removed, but still open directory */
#define S_NOQUOTA	32	/* Inode is not counted to quota */
#define S_DIRSYNC	64	/* Directory modifications are synchronous */
#define S_NOCMTIME	128	/* Do not update file c/mtime */
#define S_SWAPFILE	256	/* Do not truncate: swapon got its bmaps */
#define S_PRIVATE	512	/* Inode is fs-internal */
#define S_IMA		1024	/* Inode has an associated IMA struct */
#define S_AUTOMOUNT	2048	/* Automount/referral quasi-directory */
#define S_NOSEC		4096	/* no suid or xattr security attributes */
1857
#ifdef CONFIG_FS_DAX
1858 1859 1860 1861
#define S_DAX		8192	/* Direct Access, avoiding the page cache */
#else
#define S_DAX		0	/* Make all the DAX code disappear */
#endif
1862
#define S_ENCRYPTED	16384	/* Encrypted file (using fs/crypto/) */
D
David Howells 已提交
1863 1864 1865 1866 1867 1868 1869

/*
 * 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.
 *
1870
 * Exception: SB_RDONLY is always applied to the entire file system.
D
David Howells 已提交
1871 1872 1873 1874 1875 1876 1877 1878
 *
 * Unfortunately, it is possible to change a filesystems flags with it mounted
 * with files in use.  This means that all of the inodes will not have their
 * i_flags updated.  Hence, i_flags no longer inherit the superblock mount
 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
 */
#define __IS_FLG(inode, flg)	((inode)->i_sb->s_flags & (flg))

1879
static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & SB_RDONLY; }
1880
#define IS_RDONLY(inode)	sb_rdonly((inode)->i_sb)
1881
#define IS_SYNC(inode)		(__IS_FLG(inode, SB_SYNCHRONOUS) || \
D
David Howells 已提交
1882
					((inode)->i_flags & S_SYNC))
1883
#define IS_DIRSYNC(inode)	(__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \
D
David Howells 已提交
1884
					((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1885 1886 1887
#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)
D
David Howells 已提交
1888 1889 1890 1891

#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)
1892
#define IS_POSIXACL(inode)	__IS_FLG(inode, SB_POSIXACL)
D
David Howells 已提交
1893 1894 1895 1896 1897 1898 1899 1900

#define IS_DEADDIR(inode)	((inode)->i_flags & S_DEAD)
#define IS_NOCMTIME(inode)	((inode)->i_flags & S_NOCMTIME)
#define IS_SWAPFILE(inode)	((inode)->i_flags & S_SWAPFILE)
#define IS_PRIVATE(inode)	((inode)->i_flags & S_PRIVATE)
#define IS_IMA(inode)		((inode)->i_flags & S_IMA)
#define IS_AUTOMOUNT(inode)	((inode)->i_flags & S_AUTOMOUNT)
#define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
1901
#define IS_DAX(inode)		((inode)->i_flags & S_DAX)
1902
#define IS_ENCRYPTED(inode)	((inode)->i_flags & S_ENCRYPTED)
D
David Howells 已提交
1903

M
Miklos Szeredi 已提交
1904 1905 1906
#define IS_WHITEOUT(inode)	(S_ISCHR(inode->i_mode) && \
				 (inode)->i_rdev == WHITEOUT_DEV)

1907 1908 1909 1910 1911
static inline bool HAS_UNMAPPED_ID(struct inode *inode)
{
	return !uid_valid(inode->i_uid) || !gid_valid(inode->i_gid);
}

1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
static inline enum rw_hint file_write_hint(struct file *file)
{
	if (file->f_write_hint != WRITE_LIFE_NOT_SET)
		return file->f_write_hint;

	return file_inode(file)->i_write_hint;
}

static inline int iocb_flags(struct file *file);

static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
{
	*kiocb = (struct kiocb) {
		.ki_filp = filp,
		.ki_flags = iocb_flags(filp),
		.ki_hint = file_write_hint(filp),
	};
}

J
Joern Engel 已提交
1931
/*
1932
 * Inode state bits.  Protected by inode->i_lock
J
Joern Engel 已提交
1933 1934 1935 1936 1937 1938 1939 1940
 *
 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
 *
 * Four bits define the lifetime of an inode.  Initially, inodes are I_NEW,
 * until that flag is cleared.  I_WILL_FREE, I_FREEING and I_CLEAR are set at
 * various stages of removing an inode.
 *
C
Christoph Hellwig 已提交
1941
 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
J
Joern Engel 已提交
1942
 *
J
Joern Engel 已提交
1943 1944
 * I_DIRTY_SYNC		Inode is dirty, but doesn't have to be written on
 *			fdatasync().  i_atime is the usual cause.
1945 1946 1947 1948
 * I_DIRTY_DATASYNC	Data-related inode changes pending. We keep track of
 *			these changes separately from I_DIRTY_SYNC so that we
 *			don't have to write inode on fdatasync() when only
 *			mtime has changed in it.
J
Joern Engel 已提交
1949
 * I_DIRTY_PAGES	Inode has dirty pages.  Inode itself may be clean.
C
Christoph Hellwig 已提交
1950 1951 1952 1953 1954 1955 1956 1957
 * 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.
J
Joern Engel 已提交
1958 1959 1960 1961 1962 1963
 * 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.
1964 1965
 * I_CLEAR		Added by clear_inode().  In this state the inode is
 *			clean and can be destroyed.  Inode keeps I_FREEING.
J
Joern Engel 已提交
1966 1967 1968 1969 1970
 *
 *			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,
C
Christoph Hellwig 已提交
1971
 *			if appropriate.  I_NEW is used for waiting.
J
Joern Engel 已提交
1972
 *
1973 1974 1975 1976
 * 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.
J
Joern Engel 已提交
1977
 *
C
Christoph Hellwig 已提交
1978 1979 1980 1981
 * I_REFERENCED		Marks the inode as recently references on the LRU list.
 *
 * I_DIO_WAKEUP		Never set.  Only used as a key for wait_on_bit().
 *
1982 1983 1984 1985 1986
 * I_WB_SWITCH		Cgroup bdi_writeback switching in progress.  Used to
 *			synchronize competing switching instances and to tell
 *			wb stat updates to grab mapping->tree_lock.  See
 *			inode_switch_wb_work_fn() for details.
 *
1987 1988 1989
 * I_OVL_INUSE		Used by overlayfs to get exclusive ownership on upper
 *			and work dirs among overlayfs mounts.
 *
J
Joern Engel 已提交
1990 1991
 * Q: What is the difference between I_WILL_FREE and I_FREEING?
 */
1992 1993 1994
#define I_DIRTY_SYNC		(1 << 0)
#define I_DIRTY_DATASYNC	(1 << 1)
#define I_DIRTY_PAGES		(1 << 2)
C
Christoph Hellwig 已提交
1995 1996
#define __I_NEW			3
#define I_NEW			(1 << __I_NEW)
1997 1998 1999
#define I_WILL_FREE		(1 << 4)
#define I_FREEING		(1 << 5)
#define I_CLEAR			(1 << 6)
C
Christoph Hellwig 已提交
2000
#define __I_SYNC		7
J
Joern Engel 已提交
2001
#define I_SYNC			(1 << __I_SYNC)
2002
#define I_REFERENCED		(1 << 8)
C
Christoph Hellwig 已提交
2003
#define __I_DIO_WAKEUP		9
E
Eric Sandeen 已提交
2004
#define I_DIO_WAKEUP		(1 << __I_DIO_WAKEUP)
2005
#define I_LINKABLE		(1 << 10)
2006 2007 2008
#define I_DIRTY_TIME		(1 << 11)
#define __I_DIRTY_TIME_EXPIRED	12
#define I_DIRTY_TIME_EXPIRED	(1 << __I_DIRTY_TIME_EXPIRED)
2009
#define I_WB_SWITCH		(1 << 13)
2010
#define I_OVL_INUSE			(1 << 14)
L
Linus Torvalds 已提交
2011 2012

#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
2013
#define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
L
Linus Torvalds 已提交
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

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);
}

M
Miklos Szeredi 已提交
2026 2027 2028 2029
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);
2030 2031 2032 2033

static inline void inode_inc_link_count(struct inode *inode)
{
	inc_nlink(inode);
2034 2035 2036
	mark_inode_dirty(inode);
}

2037 2038 2039
static inline void inode_dec_link_count(struct inode *inode)
{
	drop_nlink(inode);
2040 2041 2042
	mark_inode_dirty(inode);
}

2043 2044 2045 2046 2047 2048 2049
enum file_time_flags {
	S_ATIME = 1,
	S_MTIME = 2,
	S_CTIME = 4,
	S_VERSION = 8,
};

A
Al Viro 已提交
2050
extern void touch_atime(const struct path *);
L
Linus Torvalds 已提交
2051 2052 2053
static inline void file_accessed(struct file *file)
{
	if (!(file->f_flags & O_NOATIME))
A
Al Viro 已提交
2054
		touch_atime(&file->f_path);
L
Linus Torvalds 已提交
2055 2056 2057
}

int sync_inode(struct inode *inode, struct writeback_control *wbc);
C
Christoph Hellwig 已提交
2058
int sync_inode_metadata(struct inode *inode, int wait);
L
Linus Torvalds 已提交
2059 2060 2061 2062

struct file_system_type {
	const char *name;
	int fs_flags;
D
David Howells 已提交
2063 2064 2065
#define FS_REQUIRES_DEV		1 
#define FS_BINARY_MOUNTDATA	2
#define FS_HAS_SUBTYPE		4
2066
#define FS_USERNS_MOUNT		8	/* Can be mounted by userns root */
D
David Howells 已提交
2067
#define FS_RENAME_DOES_D_MOVE	32768	/* FS will handle d_move() during rename() internally. */
A
Al Viro 已提交
2068 2069
	struct dentry *(*mount) (struct file_system_type *, int,
		       const char *, void *);
L
Linus Torvalds 已提交
2070 2071 2072
	void (*kill_sb) (struct super_block *);
	struct module *owner;
	struct file_system_type * next;
A
Al Viro 已提交
2073
	struct hlist_head fs_supers;
2074

I
Ingo Molnar 已提交
2075
	struct lock_class_key s_lock_key;
2076
	struct lock_class_key s_umount_key;
2077
	struct lock_class_key s_vfs_rename_key;
2078
	struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
2079 2080 2081

	struct lock_class_key i_lock_key;
	struct lock_class_key i_mutex_key;
2082
	struct lock_class_key i_mutex_dir_key;
L
Linus Torvalds 已提交
2083 2084
};

2085 2086
#define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)

2087 2088 2089
extern struct dentry *mount_ns(struct file_system_type *fs_type,
	int flags, void *data, void *ns, struct user_namespace *user_ns,
	int (*fill_super)(struct super_block *, void *, int));
2090
#ifdef CONFIG_BLOCK
A
Al Viro 已提交
2091 2092 2093
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));
2094 2095 2096 2097 2098 2099 2100 2101
#else
static inline 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))
{
	return ERR_PTR(-ENODEV);
}
#endif
A
Al Viro 已提交
2102 2103 2104
extern struct dentry *mount_single(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
2105 2106 2107
extern struct dentry *mount_nodev(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
2108
extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
L
Linus Torvalds 已提交
2109
void generic_shutdown_super(struct super_block *sb);
2110
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2111
void kill_block_super(struct super_block *sb);
2112 2113 2114 2115 2116 2117
#else
static inline void kill_block_super(struct super_block *sb)
{
	BUG();
}
#endif
L
Linus Torvalds 已提交
2118 2119 2120
void kill_anon_super(struct super_block *sb);
void kill_litter_super(struct super_block *sb);
void deactivate_super(struct super_block *sb);
A
Al Viro 已提交
2121
void deactivate_locked_super(struct super_block *sb);
L
Linus Torvalds 已提交
2122
int set_anon_super(struct super_block *s, void *data);
2123 2124
int get_anon_bdev(dev_t *);
void free_anon_bdev(dev_t);
2125 2126 2127 2128 2129
struct super_block *sget_userns(struct file_system_type *type,
			int (*test)(struct super_block *,void *),
			int (*set)(struct super_block *,void *),
			int flags, struct user_namespace *user_ns,
			void *data);
L
Linus Torvalds 已提交
2130 2131 2132
struct super_block *sget(struct file_system_type *type,
			int (*test)(struct super_block *,void *),
			int (*set)(struct super_block *,void *),
D
David Howells 已提交
2133
			int flags, void *data);
2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
extern struct dentry *mount_pseudo_xattr(struct file_system_type *, char *,
					 const struct super_operations *ops,
					 const struct xattr_handler **xattr,
					 const struct dentry_operations *dops,
					 unsigned long);

static inline struct dentry *
mount_pseudo(struct file_system_type *fs_type, char *name,
	     const struct super_operations *ops,
	     const struct dentry_operations *dops, unsigned long magic)
{
	return mount_pseudo_xattr(fs_type, name, ops, NULL, dops, magic);
}
L
Linus Torvalds 已提交
2147 2148 2149 2150 2151 2152

/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
#define fops_get(fops) \
	(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
#define fops_put(fops) \
	do { if (fops) module_put((fops)->owner); } while(0)
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
/*
 * 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)
L
Linus Torvalds 已提交
2164 2165 2166

extern int register_filesystem(struct file_system_type *);
extern int unregister_filesystem(struct file_system_type *);
2167 2168
extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
#define kern_mount(type) kern_mount_data(type, NULL)
2169
extern void kern_unmount(struct vfsmount *mnt);
L
Linus Torvalds 已提交
2170 2171
extern int may_umount_tree(struct vfsmount *);
extern int may_umount(struct vfsmount *);
2172 2173
extern long do_mount(const char *, const char __user *,
		     const char *, unsigned long, void *);
2174
extern struct vfsmount *collect_mounts(const struct path *);
2175
extern void drop_collected_mounts(struct vfsmount *);
A
Al Viro 已提交
2176 2177
extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
			  struct vfsmount *);
A
Al Viro 已提交
2178
extern int vfs_statfs(const struct path *, struct kstatfs *);
A
Al Viro 已提交
2179 2180
extern int user_statfs(const char __user *, struct kstatfs *);
extern int fd_statfs(int, struct kstatfs *);
2181 2182
extern int freeze_super(struct super_block *super);
extern int thaw_super(struct super_block *super);
2183
extern bool our_mnt(struct vfsmount *mnt);
2184 2185 2186
extern __printf(2, 3)
int super_setup_bdi_name(struct super_block *sb, char *fmt, ...);
extern int super_setup_bdi(struct super_block *sb);
L
Linus Torvalds 已提交
2187

A
Al Viro 已提交
2188 2189
extern int current_umask(void);

2190 2191
extern void ihold(struct inode * inode);
extern void iput(struct inode *);
2192
extern int generic_update_time(struct inode *, struct timespec *, int);
2193

M
Miklos Szeredi 已提交
2194
/* /sys/fs */
2195
extern struct kobject *fs_kobj;
M
Miklos Szeredi 已提交
2196

2197
#define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
2198

2199
#ifdef CONFIG_MANDATORY_FILE_LOCKING
2200
extern int locks_mandatory_locked(struct file *);
2201
extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char);
L
Linus Torvalds 已提交
2202 2203 2204 2205 2206

/*
 * Candidates for mandatory locking have the setgid bit set
 * but no group execute bit -  an otherwise meaningless combination.
 */
2207 2208 2209 2210 2211 2212 2213

static inline int __mandatory_lock(struct inode *ino)
{
	return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
}

/*
2214
 * ... and these candidates should be on SB_MANDLOCK mounted fs,
2215 2216 2217 2218 2219 2220 2221
 * otherwise these will be advisory locks
 */

static inline int mandatory_lock(struct inode *ino)
{
	return IS_MANDLOCK(ino) && __mandatory_lock(ino);
}
L
Linus Torvalds 已提交
2222

2223
static inline int locks_verify_locked(struct file *file)
L
Linus Torvalds 已提交
2224
{
2225
	if (mandatory_lock(locks_inode(file)))
2226
		return locks_mandatory_locked(file);
L
Linus Torvalds 已提交
2227 2228 2229 2230
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode,
2231
				    struct file *f,
L
Linus Torvalds 已提交
2232 2233
				    loff_t size)
{
2234 2235 2236 2237 2238 2239 2240 2241 2242 2243
	if (!inode->i_flctx || !mandatory_lock(inode))
		return 0;

	if (size < inode->i_size) {
		return locks_mandatory_area(inode, f, size, inode->i_size - 1,
				F_WRLCK);
	} else {
		return locks_mandatory_area(inode, f, inode->i_size, size - 1,
				F_WRLCK);
	}
L
Linus Torvalds 已提交
2244 2245
}

2246 2247 2248 2249 2250 2251 2252
#else /* !CONFIG_MANDATORY_FILE_LOCKING */

static inline int locks_mandatory_locked(struct file *file)
{
	return 0;
}

2253 2254
static inline int locks_mandatory_area(struct inode *inode, struct file *filp,
                                       loff_t start, loff_t end, unsigned char type)
2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283
{
	return 0;
}

static inline int __mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int locks_verify_locked(struct file *file)
{
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
					size_t size)
{
	return 0;
}

#endif /* CONFIG_MANDATORY_FILE_LOCKING */


#ifdef CONFIG_FILE_LOCKING
L
Linus Torvalds 已提交
2284 2285
static inline int break_lease(struct inode *inode, unsigned int mode)
{
2286 2287
	/*
	 * Since this check is lockless, we must ensure that any refcounts
2288 2289 2290
	 * taken are done before checking i_flctx->flc_lease. Otherwise, we
	 * could end up racing with tasks trying to set a new lease on this
	 * file.
2291 2292
	 */
	smp_mb();
2293
	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
J
J. Bruce Fields 已提交
2294
		return __break_lease(inode, mode, FL_LEASE);
L
Linus Torvalds 已提交
2295 2296
	return 0;
}
J
J. Bruce Fields 已提交
2297 2298 2299

static inline int break_deleg(struct inode *inode, unsigned int mode)
{
2300 2301
	/*
	 * Since this check is lockless, we must ensure that any refcounts
2302 2303 2304
	 * taken are done before checking i_flctx->flc_lease. Otherwise, we
	 * could end up racing with tasks trying to set a new lease on this
	 * file.
2305 2306
	 */
	smp_mb();
2307
	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
J
J. Bruce Fields 已提交
2308
		return __break_lease(inode, mode, FL_DELEG);
L
Linus Torvalds 已提交
2309 2310
	return 0;
}
J
J. Bruce Fields 已提交
2311

2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333
static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
{
	int ret;

	ret = break_deleg(inode, O_WRONLY|O_NONBLOCK);
	if (ret == -EWOULDBLOCK && delegated_inode) {
		*delegated_inode = inode;
		ihold(inode);
	}
	return ret;
}

static inline int break_deleg_wait(struct inode **delegated_inode)
{
	int ret;

	ret = break_deleg(*delegated_inode, O_WRONLY);
	iput(*delegated_inode);
	*delegated_inode = NULL;
	return ret;
}

C
Christoph Hellwig 已提交
2334 2335 2336 2337 2338 2339 2340 2341 2342 2343
static inline int break_layout(struct inode *inode, bool wait)
{
	smp_mb();
	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
		return __break_lease(inode,
				wait ? O_WRONLY : O_WRONLY | O_NONBLOCK,
				FL_LAYOUT);
	return 0;
}

2344
#else /* !CONFIG_FILE_LOCKING */
2345 2346 2347 2348 2349
static inline int break_lease(struct inode *inode, unsigned int mode)
{
	return 0;
}

J
J. Bruce Fields 已提交
2350 2351 2352 2353
static inline int break_deleg(struct inode *inode, unsigned int mode)
{
	return 0;
}
2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365

static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
{
	return 0;
}

static inline int break_deleg_wait(struct inode **delegated_inode)
{
	BUG();
	return 0;
}

C
Christoph Hellwig 已提交
2366 2367 2368 2369 2370
static inline int break_layout(struct inode *inode, bool wait)
{
	return 0;
}

2371
#endif /* CONFIG_FILE_LOCKING */
L
Linus Torvalds 已提交
2372 2373

/* fs/open.c */
2374
struct audit_names;
2375
struct filename {
2376 2377 2378
	const char		*name;	/* pointer to actual string */
	const __user char	*uptr;	/* original userland pointer */
	struct audit_names	*aname;
2379
	int			refcnt;
A
Al Viro 已提交
2380
	const char		iname[];
2381
};
L
Linus Torvalds 已提交
2382

A
Al Viro 已提交
2383
extern long vfs_truncate(const struct path *, loff_t);
2384 2385
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
		       struct file *filp);
2386
extern int vfs_fallocate(struct file *file, int mode, loff_t offset,
2387
			loff_t len);
J
Jason Uhlenkott 已提交
2388
extern long do_sys_open(int dfd, const char __user *filename, int flags,
2389
			umode_t mode);
2390
extern struct file *file_open_name(struct filename *, int, umode_t);
2391
extern struct file *filp_open(const char *, int, umode_t);
A
Al Viro 已提交
2392
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
2393
				   const char *, int, umode_t);
2394
extern struct file * dentry_open(const struct path *, int, const struct cred *);
L
Linus Torvalds 已提交
2395
extern int filp_close(struct file *, fl_owner_t id);
2396

2397
extern struct filename *getname_flags(const char __user *, int, int *);
2398
extern struct filename *getname(const char __user *);
2399
extern struct filename *getname_kernel(const char *);
2400
extern void putname(struct filename *name);
2401

2402 2403 2404 2405
enum {
	FILE_CREATED = 1,
	FILE_OPENED = 2
};
A
Al Viro 已提交
2406 2407 2408
extern int finish_open(struct file *file, struct dentry *dentry,
			int (*open)(struct inode *, struct file *),
			int *opened);
A
Al Viro 已提交
2409
extern int finish_no_open(struct file *file, struct dentry *dentry);
L
Linus Torvalds 已提交
2410

2411 2412 2413 2414
/* fs/ioctl.c */

extern int ioctl_preallocate(struct file *filp, void __user *argp);

L
Linus Torvalds 已提交
2415 2416
/* fs/dcache.c */
extern void __init vfs_caches_init_early(void);
2417
extern void __init vfs_caches_init(void);
L
Linus Torvalds 已提交
2418

2419 2420
extern struct kmem_cache *names_cachep;

2421
#define __getname()		kmem_cache_alloc(names_cachep, GFP_KERNEL)
V
Vegard Nossum 已提交
2422
#define __putname(name)		kmem_cache_free(names_cachep, (void *)(name))
L
Linus Torvalds 已提交
2423

2424
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2425
extern int register_blkdev(unsigned int, const char *);
A
Akinobu Mita 已提交
2426
extern void unregister_blkdev(unsigned int, const char *);
2427
extern void bdev_unhash_inode(dev_t dev);
L
Linus Torvalds 已提交
2428
extern struct block_device *bdget(dev_t);
2429
extern struct block_device *bdgrab(struct block_device *bdev);
L
Linus Torvalds 已提交
2430 2431 2432
extern void bd_set_size(struct block_device *, loff_t size);
extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
N
Nick Piggin 已提交
2433
extern void invalidate_bdev(struct block_device *);
2434
extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
N
Nick Piggin 已提交
2435
extern int sync_blockdev(struct block_device *bdev);
A
Al Viro 已提交
2436
extern void kill_bdev(struct block_device *);
N
Nick Piggin 已提交
2437
extern struct super_block *freeze_bdev(struct block_device *);
2438
extern void emergency_thaw_all(void);
N
Nick Piggin 已提交
2439 2440
extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
extern int fsync_bdev(struct block_device *);
T
Tejun Heo 已提交
2441 2442 2443 2444 2445 2446 2447

extern struct super_block *blockdev_superblock;

static inline bool sb_is_blkdev_sb(struct super_block *sb)
{
	return sb == blockdev_superblock;
}
2448 2449
#else
static inline void bd_forget(struct inode *inode) {}
2450
static inline int sync_blockdev(struct block_device *bdev) { return 0; }
A
Al Viro 已提交
2451
static inline void kill_bdev(struct block_device *bdev) {}
2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462
static inline void invalidate_bdev(struct block_device *bdev) {}

static inline struct super_block *freeze_bdev(struct block_device *sb)
{
	return NULL;
}

static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
{
	return 0;
}
2463 2464 2465 2466

static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
{
}
2467

2468
static inline bool sb_is_blkdev_sb(struct super_block *sb)
2469
{
2470
	return false;
2471
}
2472
#endif
2473
extern int sync_filesystem(struct super_block *);
2474
extern const struct file_operations def_blk_fops;
2475
extern const struct file_operations def_chr_fops;
2476
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2477
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2478
extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
L
Linus Torvalds 已提交
2479
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2480
extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2481 2482 2483 2484
extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
					       void *holder);
extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
					      void *holder);
A
Al Viro 已提交
2485
extern void blkdev_put(struct block_device *bdev, fmode_t mode);
2486 2487 2488
extern int __blkdev_reread_part(struct block_device *bdev);
extern int blkdev_reread_part(struct block_device *bdev);

2489
#ifdef CONFIG_SYSFS
2490
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2491 2492
extern void bd_unlink_disk_holder(struct block_device *bdev,
				  struct gendisk *disk);
2493
#else
2494 2495 2496 2497 2498
static inline int bd_link_disk_holder(struct block_device *bdev,
				      struct gendisk *disk)
{
	return 0;
}
2499 2500 2501 2502
static inline void bd_unlink_disk_holder(struct block_device *bdev,
					 struct gendisk *disk)
{
}
2503
#endif
2504
#endif
L
Linus Torvalds 已提交
2505 2506

/* fs/char_dev.c */
2507
#define CHRDEV_MAJOR_MAX 512
2508 2509
/* Marks the bottom of the first segment of free char majors */
#define CHRDEV_MAJOR_DYN_END 234
2510 2511 2512 2513
/* 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

L
Linus Torvalds 已提交
2514 2515
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
extern int register_chrdev_region(dev_t, unsigned, const char *);
2516 2517 2518 2519 2520
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);
L
Linus Torvalds 已提交
2521
extern void unregister_chrdev_region(dev_t, unsigned);
2522
extern void chrdev_show(struct seq_file *,off_t);
L
Linus Torvalds 已提交
2523

2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534
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);
}

L
Linus Torvalds 已提交
2535 2536
/* fs/block_dev.c */
#define BDEVNAME_SIZE	32	/* Largest string for a blockdev identifier */
2537
#define BDEVT_SIZE	10	/* Largest string for MAJ:MIN for blkdev */
2538 2539

#ifdef CONFIG_BLOCK
2540
#define BLKDEV_MAJOR_MAX	512
L
Linus Torvalds 已提交
2541 2542 2543
extern const char *__bdevname(dev_t, char *buffer);
extern const char *bdevname(struct block_device *bdev, char *buffer);
extern struct block_device *lookup_bdev(const char *);
2544
extern void blkdev_show(struct seq_file *,off_t);
2545

2546
#else
2547
#define BLKDEV_MAJOR_MAX	0
2548
#endif
L
Linus Torvalds 已提交
2549 2550 2551 2552 2553

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 *);
2554
extern bool is_bad_inode(struct inode *);
L
Linus Torvalds 已提交
2555

2556
#ifdef CONFIG_BLOCK
2557 2558
extern void check_disk_size_change(struct gendisk *disk,
				   struct block_device *bdev);
2559
extern int revalidate_disk(struct gendisk *);
L
Linus Torvalds 已提交
2560
extern int check_disk_change(struct block_device *);
2561
extern int __invalidate_device(struct block_device *, bool);
L
Linus Torvalds 已提交
2562
extern int invalidate_partition(struct gendisk *, int);
2563
#endif
L
Linus Torvalds 已提交
2564 2565
unsigned long invalidate_mapping_pages(struct address_space *mapping,
					pgoff_t start, pgoff_t end);
2566

L
Linus Torvalds 已提交
2567 2568 2569 2570
static inline void invalidate_remote_inode(struct inode *inode)
{
	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
	    S_ISLNK(inode->i_mode))
2571
		invalidate_mapping_pages(inode->i_mapping, 0, -1);
L
Linus Torvalds 已提交
2572 2573 2574 2575 2576 2577 2578
}
extern int invalidate_inode_pages2(struct address_space *mapping);
extern int invalidate_inode_pages2_range(struct address_space *mapping,
					 pgoff_t start, pgoff_t end);
extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
2579
extern int filemap_fdatawait_keep_errors(struct address_space *mapping);
2580 2581
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
				   loff_t lend);
2582 2583 2584 2585 2586 2587

static inline int filemap_fdatawait(struct address_space *mapping)
{
	return filemap_fdatawait_range(mapping, 0, LLONG_MAX);
}

2588 2589
extern bool filemap_range_has_page(struct address_space *, loff_t lstart,
				  loff_t lend);
2590 2591
extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
						loff_t lend);
L
Linus Torvalds 已提交
2592 2593 2594
extern int filemap_write_and_wait(struct address_space *mapping);
extern int filemap_write_and_wait_range(struct address_space *mapping,
				        loff_t lstart, loff_t lend);
2595 2596
extern int __filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end, int sync_mode);
2597 2598
extern int filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end);
2599
extern int filemap_check_errors(struct address_space *mapping);
2600
extern void __filemap_set_wb_err(struct address_space *mapping, int err);
2601 2602 2603

extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
						loff_t lend);
2604 2605 2606 2607
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);

2608 2609 2610 2611 2612
static inline int file_write_and_wait(struct file *file)
{
	return file_write_and_wait_range(file, 0, LLONG_MAX);
}

2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661
/**
 * filemap_set_wb_err - set a writeback error on an address_space
 * @mapping: mapping in which to set writeback error
 * @err: error to be set in mapping
 *
 * When writeback fails in some way, we must record that error so that
 * userspace can be informed when fsync and the like are called.  We endeavor
 * to report errors on any file that was open at the time of the error.  Some
 * internal callers also need to know when writeback errors have occurred.
 *
 * When a writeback error occurs, most filesystems will want to call
 * filemap_set_wb_err to record the error in the mapping so that it will be
 * automatically reported whenever fsync is called on the file.
 */
static inline void filemap_set_wb_err(struct address_space *mapping, int err)
{
	/* Fastpath for common case of no error */
	if (unlikely(err))
		__filemap_set_wb_err(mapping, err);
}

/**
 * filemap_check_wb_error - has an error occurred since the mark was sampled?
 * @mapping: mapping to check for writeback errors
 * @since: previously-sampled errseq_t
 *
 * Grab the errseq_t value from the mapping, and see if it has changed "since"
 * the given value was sampled.
 *
 * If it has then report the latest error set, otherwise return 0.
 */
static inline int filemap_check_wb_err(struct address_space *mapping,
					errseq_t since)
{
	return errseq_check(&mapping->wb_err, since);
}

/**
 * filemap_sample_wb_err - sample the current errseq_t to test for later errors
 * @mapping: mapping to be sampled
 *
 * Writeback errors are always reported relative to a particular sample point
 * in the past. This function provides those sample points.
 */
static inline errseq_t filemap_sample_wb_err(struct address_space *mapping)
{
	return errseq_sample(&mapping->wb_err);
}

2662 2663 2664
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);
2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681

/*
 * 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->ki_flags & IOCB_DSYNC) {
		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;
	}

	return count;
2682
}
2683

L
Linus Torvalds 已提交
2684 2685
extern void emergency_sync(void);
extern void emergency_remount(void);
2686
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2687
extern sector_t bmap(struct inode *, sector_t);
2688
#endif
2689
extern int notify_change(struct dentry *, struct iattr *, struct inode **);
2690
extern int inode_permission(struct inode *, int);
2691
extern int generic_permission(struct inode *, int);
M
Miklos Szeredi 已提交
2692
extern int __check_sticky(struct inode *dir, struct inode *inode);
L
Linus Torvalds 已提交
2693

2694 2695 2696 2697 2698
static inline bool execute_ok(struct inode *inode)
{
	return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
}

2699 2700 2701 2702 2703 2704 2705
static inline void file_start_write(struct file *file)
{
	if (!S_ISREG(file_inode(file)->i_mode))
		return;
	__sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
}

2706 2707 2708 2709 2710 2711 2712
static inline bool file_start_write_trylock(struct file *file)
{
	if (!S_ISREG(file_inode(file)->i_mode))
		return true;
	return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false);
}

2713 2714 2715 2716 2717 2718 2719
static inline void file_end_write(struct file *file)
{
	if (!S_ISREG(file_inode(file)->i_mode))
		return;
	__sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE);
}

2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732
static inline int do_clone_file_range(struct file *file_in, loff_t pos_in,
				      struct file *file_out, loff_t pos_out,
				      u64 len)
{
	int ret;

	file_start_write(file_out);
	ret = vfs_clone_file_range(file_in, pos_in, file_out, pos_out, len);
	file_end_write(file_out);

	return ret;
}

2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754
/*
 * get_write_access() gets write permission for a file.
 * put_write_access() releases this write permission.
 * This is used for regular files.
 * We cannot support write (and maybe mmap read-write shared) accesses and
 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
 * can have the following values:
 * 0: no writers, no VM_DENYWRITE mappings
 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
 * > 0: (i_writecount) users are writing to the file.
 *
 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
 * except for the cases where we don't hold i_writecount yet. Then we need to
 * use {get,deny}_write_access() - these functions check the sign and refuse
 * to do the change if sign is wrong.
 */
static inline int get_write_access(struct inode *inode)
{
	return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
}
static inline int deny_write_access(struct file *file)
{
A
Al Viro 已提交
2755
	struct inode *inode = file_inode(file);
2756 2757
	return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
}
L
Linus Torvalds 已提交
2758 2759 2760 2761 2762 2763 2764
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)
A
Al Viro 已提交
2765
		atomic_inc(&file_inode(file)->i_writecount);
L
Linus Torvalds 已提交
2766
}
2767 2768 2769 2770 2771
static inline bool inode_is_open_for_write(const struct inode *inode)
{
	return atomic_read(&inode->i_writecount) > 0;
}

M
Mimi Zohar 已提交
2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791
#ifdef CONFIG_IMA
static inline void i_readcount_dec(struct inode *inode)
{
	BUG_ON(!atomic_read(&inode->i_readcount));
	atomic_dec(&inode->i_readcount);
}
static inline void i_readcount_inc(struct inode *inode)
{
	atomic_inc(&inode->i_readcount);
}
#else
static inline void i_readcount_dec(struct inode *inode)
{
	return;
}
static inline void i_readcount_inc(struct inode *inode)
{
	return;
}
#endif
U
Ulrich Drepper 已提交
2792
extern int do_pipe_flags(int *, int);
L
Linus Torvalds 已提交
2793

2794 2795 2796
#define __kernel_read_file_id(id) \
	id(UNKNOWN, unknown)		\
	id(FIRMWARE, firmware)		\
2797
	id(FIRMWARE_PREALLOC_BUFFER, firmware)	\
2798 2799 2800 2801
	id(MODULE, kernel-module)		\
	id(KEXEC_IMAGE, kexec-image)		\
	id(KEXEC_INITRAMFS, kexec-initramfs)	\
	id(POLICY, security-policy)		\
2802
	id(X509_CERTIFICATE, x509-certificate)	\
2803 2804 2805 2806 2807
	id(MAX_ID, )

#define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
#define __fid_stringify(dummy, str) #str,

2808
enum kernel_read_file_id {
2809 2810 2811 2812 2813
	__kernel_read_file_id(__fid_enumify)
};

static const char * const kernel_read_file_str[] = {
	__kernel_read_file_id(__fid_stringify)
2814 2815
};

K
Kees Cook 已提交
2816
static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
2817
{
2818
	if ((unsigned)id >= READING_MAX_ID)
2819 2820 2821 2822 2823
		return kernel_read_file_str[READING_UNKNOWN];

	return kernel_read_file_str[id];
}

2824 2825
extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
			    enum kernel_read_file_id);
2826
extern int kernel_read_file_from_path(const char *, void **, loff_t *, loff_t,
2827
				      enum kernel_read_file_id);
2828 2829
extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t,
				    enum kernel_read_file_id);
2830
extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
2831
extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *);
2832
extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *);
L
Linus Torvalds 已提交
2833 2834 2835
extern struct file * open_exec(const char *);
 
/* fs/dcache.c -- generic fs support functions */
Y
Yaowei Bai 已提交
2836
extern bool is_subdir(struct dentry *, struct dentry *);
2837
extern bool path_is_under(const struct path *, const struct path *);
L
Linus Torvalds 已提交
2838

M
Miklos Szeredi 已提交
2839 2840
extern char *file_path(struct file *, char *, int);

L
Linus Torvalds 已提交
2841 2842 2843
#include <linux/err.h>

/* needed for stackable file system support */
2844
extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
L
Linus Torvalds 已提交
2845

2846
extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
L
Linus Torvalds 已提交
2847

2848
extern int inode_init_always(struct super_block *, struct inode *);
L
Linus Torvalds 已提交
2849
extern void inode_init_once(struct inode *);
2850
extern void address_space_init_once(struct address_space *mapping);
L
Linus Torvalds 已提交
2851 2852 2853
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
extern int inode_needs_sync(struct inode *inode);
2854
extern int generic_delete_inode(struct inode *inode);
2855 2856 2857 2858
static inline int generic_drop_inode(struct inode *inode)
{
	return !inode->i_nlink || inode_unhashed(inode);
}
L
Linus Torvalds 已提交
2859

2860 2861 2862
extern struct inode *ilookup5_nowait(struct super_block *sb,
		unsigned long hashval, int (*test)(struct inode *, void *),
		void *data);
L
Linus Torvalds 已提交
2863 2864 2865 2866 2867 2868
extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
		int (*test)(struct inode *, void *), void *data);
extern struct inode *ilookup(struct super_block *sb, unsigned long ino);

extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
extern struct inode * iget_locked(struct super_block *, unsigned long);
2869 2870 2871 2872 2873
extern struct inode *find_inode_nowait(struct super_block *,
				       unsigned long,
				       int (*match)(struct inode *,
						    unsigned long, void *),
				       void *data);
A
Al Viro 已提交
2874 2875
extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
extern int insert_inode_locked(struct inode *);
2876 2877 2878 2879 2880
#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
L
Linus Torvalds 已提交
2881
extern void unlock_new_inode(struct inode *);
2882
extern unsigned int get_next_ino(void);
2883
extern void evict_inodes(struct super_block *sb);
L
Linus Torvalds 已提交
2884 2885

extern void __iget(struct inode * inode);
2886
extern void iget_failed(struct inode *);
2887
extern void clear_inode(struct inode *);
C
Christoph Hellwig 已提交
2888
extern void __destroy_inode(struct inode *);
2889 2890
extern struct inode *new_inode_pseudo(struct super_block *sb);
extern struct inode *new_inode(struct super_block *sb);
2891
extern void free_inode_nonrcu(struct inode *inode);
2892
extern int should_remove_suid(struct dentry *);
2893
extern int file_remove_privs(struct file *);
L
Linus Torvalds 已提交
2894 2895

extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2896 2897
static inline void insert_inode_hash(struct inode *inode)
{
L
Linus Torvalds 已提交
2898 2899
	__insert_inode_hash(inode, inode->i_ino);
}
2900 2901 2902 2903

extern void __remove_inode_hash(struct inode *);
static inline void remove_inode_hash(struct inode *inode)
{
2904
	if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash))
2905 2906 2907
		__remove_inode_hash(inode);
}

2908
extern void inode_sb_list_add(struct inode *inode);
L
Linus Torvalds 已提交
2909

2910
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2911
extern int bdev_read_only(struct block_device *);
2912
#endif
L
Linus Torvalds 已提交
2913 2914 2915 2916 2917 2918
extern int set_blocksize(struct block_device *, int);
extern int sb_set_blocksize(struct super_block *, int);
extern int sb_min_blocksize(struct super_block *, int);

extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2919
extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);
A
Al Viro 已提交
2920
extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
2921 2922
extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
2923
extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *);
2924
extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
A
Andrew Morton 已提交
2925

2926
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
C
Christoph Hellwig 已提交
2927
		rwf_t flags);
2928
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
C
Christoph Hellwig 已提交
2929
		rwf_t flags);
2930

2931
/* fs/block_dev.c */
2932
extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);
2933
extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from);
2934 2935
extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
			int datasync);
A
Al Viro 已提交
2936
extern void block_sync_page(struct page *page);
2937

A
Andrew Morton 已提交
2938
/* fs/splice.c */
2939
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
A
Andrew Morton 已提交
2940
		struct pipe_inode_info *, size_t, unsigned int);
A
Al Viro 已提交
2941
extern ssize_t iter_file_splice_write(struct pipe_inode_info *,
2942
		struct file *, loff_t *, size_t, unsigned int);
A
Andrew Morton 已提交
2943
extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2944
		struct file *out, loff_t *, size_t len, unsigned int flags);
2945 2946 2947
extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
		loff_t *opos, size_t len, unsigned int flags);

A
Andrew Morton 已提交
2948

L
Linus Torvalds 已提交
2949 2950
extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
2951 2952
extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
extern loff_t no_llseek(struct file *file, loff_t offset, int whence);
J
Jie Liu 已提交
2953
extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize);
2954
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
A
Andi Kleen 已提交
2955
extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
2956
		int whence, loff_t maxsize, loff_t eof);
A
Al Viro 已提交
2957 2958
extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
		int whence, loff_t size);
2959 2960
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);
L
Linus Torvalds 已提交
2961 2962 2963
extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);

2964
#ifdef CONFIG_BLOCK
2965
typedef void (dio_submit_t)(struct bio *bio, struct inode *inode,
2966
			    loff_t file_offset);
L
Linus Torvalds 已提交
2967 2968

enum {
2969 2970 2971 2972 2973
	/* need locking between buffered and direct access */
	DIO_LOCKING	= 0x01,

	/* filesystem does not support filling holes */
	DIO_SKIP_HOLES	= 0x02,
2974 2975 2976

	/* filesystem can handle aio writes beyond i_size */
	DIO_ASYNC_EXTEND = 0x04,
2977 2978 2979

	/* inode/fs/bdev does not need truncate protection */
	DIO_SKIP_DIO_COUNT = 0x08,
L
Linus Torvalds 已提交
2980 2981
};

2982
void dio_end_io(struct bio *bio);
2983

2984 2985
ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
			     struct block_device *bdev, struct iov_iter *iter,
2986
			     get_block_t get_block,
2987 2988
			     dio_iodone_t end_io, dio_submit_t submit_io,
			     int flags);
2989

2990 2991
static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
					 struct inode *inode,
2992
					 struct iov_iter *iter,
2993
					 get_block_t get_block)
L
Linus Torvalds 已提交
2994
{
2995
	return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
2996
			get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES);
L
Linus Torvalds 已提交
2997
}
2998
#endif
L
Linus Torvalds 已提交
2999

3000
void inode_dio_wait(struct inode *inode);
3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025

/*
 * inode_dio_begin - signal start of a direct I/O requests
 * @inode: inode the direct I/O happens on
 *
 * This is called once we've finished processing a direct I/O request,
 * and is used to wake up callers waiting for direct I/O to be quiesced.
 */
static inline void inode_dio_begin(struct inode *inode)
{
	atomic_inc(&inode->i_dio_count);
}

/*
 * inode_dio_end - signal finish of a direct I/O requests
 * @inode: inode the direct I/O happens on
 *
 * This is called once we've finished processing a direct I/O request,
 * and is used to wake up callers waiting for direct I/O to be quiesced.
 */
static inline void inode_dio_end(struct inode *inode)
{
	if (atomic_dec_and_test(&inode->i_dio_count))
		wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
}
3026

3027 3028 3029
extern void inode_set_flags(struct inode *inode, unsigned int flags,
			    unsigned int mask);

3030
extern const struct file_operations generic_ro_fops;
L
Linus Torvalds 已提交
3031 3032 3033

#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))

A
Al Viro 已提交
3034
extern int readlink_copy(char __user *, int, const char *);
L
Linus Torvalds 已提交
3035
extern int page_readlink(struct dentry *, char __user *, int);
3036 3037 3038
extern const char *page_get_link(struct dentry *, struct inode *,
				 struct delayed_call *);
extern void page_put_link(void *);
3039
extern int __page_symlink(struct inode *inode, const char *symname, int len,
3040
		int nofs);
L
Linus Torvalds 已提交
3041
extern int page_symlink(struct inode *inode, const char *symname, int len);
3042
extern const struct inode_operations page_symlink_inode_operations;
3043
extern void kfree_link(void *);
L
Linus Torvalds 已提交
3044
extern void generic_fillattr(struct inode *, struct kstat *);
3045 3046
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);
3047
void __inode_add_bytes(struct inode *inode, loff_t bytes);
L
Linus Torvalds 已提交
3048
void inode_add_bytes(struct inode *inode, loff_t bytes);
3049
void __inode_sub_bytes(struct inode *inode, loff_t bytes);
L
Linus Torvalds 已提交
3050
void inode_sub_bytes(struct inode *inode, loff_t bytes);
J
Jan Kara 已提交
3051 3052 3053 3054
static inline loff_t __inode_get_bytes(struct inode *inode)
{
	return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
}
L
Linus Torvalds 已提交
3055 3056
loff_t inode_get_bytes(struct inode *inode);
void inode_set_bytes(struct inode *inode, loff_t bytes);
3057 3058
const char *simple_get_link(struct dentry *, struct inode *,
			    struct delayed_call *);
A
Al Viro 已提交
3059
extern const struct inode_operations simple_symlink_inode_operations;
L
Linus Torvalds 已提交
3060

3061
extern int iterate_dir(struct file *, struct dir_context *);
L
Linus Torvalds 已提交
3062

3063 3064 3065 3066 3067
extern int vfs_statx(int, const char __user *, int, struct kstat *, u32);
extern int vfs_statx_fd(unsigned int, struct kstat *, u32, unsigned int);

static inline int vfs_stat(const char __user *filename, struct kstat *stat)
{
3068 3069
	return vfs_statx(AT_FDCWD, filename, AT_NO_AUTOMOUNT,
			 stat, STATX_BASIC_STATS);
3070 3071 3072
}
static inline int vfs_lstat(const char __user *name, struct kstat *stat)
{
3073
	return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT,
3074 3075 3076 3077 3078
			 stat, STATX_BASIC_STATS);
}
static inline int vfs_fstatat(int dfd, const char __user *filename,
			      struct kstat *stat, int flags)
{
3079 3080
	return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT,
			 stat, STATX_BASIC_STATS);
3081 3082 3083 3084 3085 3086 3087
}
static inline int vfs_fstat(int fd, struct kstat *stat)
{
	return vfs_statx_fd(fd, stat, STATX_BASIC_STATS, 0);
}


M
Miklos Szeredi 已提交
3088
extern const char *vfs_get_link(struct dentry *, struct delayed_call *);
3089
extern int vfs_readlink(struct dentry *, char __user *, int);
L
Linus Torvalds 已提交
3090

3091
extern int __generic_block_fiemap(struct inode *inode,
J
Josef Bacik 已提交
3092 3093 3094
				  struct fiemap_extent_info *fieinfo,
				  loff_t start, loff_t len,
				  get_block_t *get_block);
3095 3096 3097
extern int generic_block_fiemap(struct inode *inode,
				struct fiemap_extent_info *fieinfo, u64 start,
				u64 len, get_block_t *get_block);
L
Linus Torvalds 已提交
3098

3099
extern struct file_system_type *get_filesystem(struct file_system_type *fs);
3100
extern void put_filesystem(struct file_system_type *fs);
L
Linus Torvalds 已提交
3101 3102
extern struct file_system_type *get_fs_type(const char *name);
extern struct super_block *get_super(struct block_device *);
3103
extern struct super_block *get_super_thawed(struct block_device *);
3104
extern struct super_block *get_super_exclusive_thawed(struct block_device *bdev);
3105
extern struct super_block *get_active_super(struct block_device *bdev);
L
Linus Torvalds 已提交
3106
extern void drop_super(struct super_block *sb);
3107
extern void drop_super_exclusive(struct super_block *sb);
A
Al Viro 已提交
3108
extern void iterate_supers(void (*)(struct super_block *, void *), void *);
A
Al Viro 已提交
3109 3110
extern void iterate_supers_type(struct file_system_type *,
			        void (*)(struct super_block *, void *), void *);
L
Linus Torvalds 已提交
3111 3112 3113 3114

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);
3115
extern int dcache_readdir(struct file *, struct dir_context *);
3116
extern int simple_setattr(struct dentry *, struct iattr *);
3117
extern int simple_getattr(const struct path *, struct kstat *, u32, unsigned int);
3118
extern int simple_statfs(struct dentry *, struct kstatfs *);
S
Stephen Boyd 已提交
3119
extern int simple_open(struct inode *inode, struct file *file);
L
Linus Torvalds 已提交
3120 3121 3122
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 *);
3123 3124
extern int simple_rename(struct inode *, struct dentry *,
			 struct inode *, struct dentry *, unsigned int);
3125
extern int noop_fsync(struct file *, loff_t, loff_t, int);
L
Linus Torvalds 已提交
3126 3127
extern int simple_empty(struct dentry *);
extern int simple_readpage(struct file *file, struct page *page);
3128 3129 3130 3131 3132 3133
extern int simple_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata);
extern int simple_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata);
3134
extern int always_delete_dentry(const struct dentry *);
A
Al Viro 已提交
3135
extern struct inode *alloc_anon_inode(struct super_block *);
3136
extern int simple_nosetlease(struct file *, long, struct file_lock **, void **);
3137
extern const struct dentry_operations simple_dentry_operations;
L
Linus Torvalds 已提交
3138

A
Al Viro 已提交
3139
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
L
Linus Torvalds 已提交
3140
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
3141
extern const struct file_operations simple_dir_operations;
3142
extern const struct inode_operations simple_dir_inode_operations;
3143 3144
extern void make_empty_dir_inode(struct inode *inode);
extern bool is_empty_dir_inode(struct inode *inode);
3145
struct tree_descr { const char *name; const struct file_operations *ops; int mode; };
L
Linus Torvalds 已提交
3146
struct dentry *d_alloc_name(struct dentry *, const char *);
3147 3148
extern int simple_fill_super(struct super_block *, unsigned long,
			     const struct tree_descr *);
3149
extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
L
Linus Torvalds 已提交
3150 3151
extern void simple_release_fs(struct vfsmount **mount, int *count);

3152 3153
extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
			loff_t *ppos, const void *from, size_t available);
3154 3155
extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
		const void __user *from, size_t count);
L
Linus Torvalds 已提交
3156

3157
extern int __generic_file_fsync(struct file *, loff_t, loff_t, int);
3158
extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
A
Al Viro 已提交
3159

3160 3161
extern int generic_check_addressable(unsigned, u64);

3162
#ifdef CONFIG_MIGRATION
3163
extern int buffer_migrate_page(struct address_space *,
3164 3165
				struct page *, struct page *,
				enum migrate_mode);
3166 3167 3168 3169
#else
#define buffer_migrate_page NULL
#endif

3170
extern int setattr_prepare(struct dentry *, struct iattr *);
N
npiggin@suse.de 已提交
3171
extern int inode_newsize_ok(const struct inode *, loff_t offset);
C
Christoph Hellwig 已提交
3172
extern void setattr_copy(struct inode *inode, const struct iattr *attr);
L
Linus Torvalds 已提交
3173

3174
extern int file_update_time(struct file *file);
L
Linus Torvalds 已提交
3175

3176 3177
static inline bool io_is_direct(struct file *filp)
{
3178
	return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host);
3179 3180
}

3181 3182 3183 3184 3185
static inline bool vma_is_dax(struct vm_area_struct *vma)
{
	return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
}

3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199
static inline bool vma_is_fsdax(struct vm_area_struct *vma)
{
	struct inode *inode;

	if (!vma->vm_file)
		return false;
	if (!vma_is_dax(vma))
		return false;
	inode = file_inode(vma->vm_file);
	if (inode->i_mode == S_IFCHR)
		return false; /* device-dax */
	return true;
}

3200 3201 3202 3203 3204 3205 3206
static inline int iocb_flags(struct file *file)
{
	int res = 0;
	if (file->f_flags & O_APPEND)
		res |= IOCB_APPEND;
	if (io_is_direct(file))
		res |= IOCB_DIRECT;
3207 3208 3209 3210
	if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
		res |= IOCB_DSYNC;
	if (file->f_flags & __O_SYNC)
		res |= IOCB_SYNC;
3211 3212 3213
	return res;
}

C
Christoph Hellwig 已提交
3214
static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
3215 3216 3217 3218
{
	if (unlikely(flags & ~RWF_SUPPORTED))
		return -EOPNOTSUPP;

3219
	if (flags & RWF_NOWAIT) {
3220
		if (!(ki->ki_filp->f_mode & FMODE_NOWAIT))
3221 3222 3223
			return -EOPNOTSUPP;
		ki->ki_flags |= IOCB_NOWAIT;
	}
3224 3225 3226 3227 3228 3229
	if (flags & RWF_HIPRI)
		ki->ki_flags |= IOCB_HIPRI;
	if (flags & RWF_DSYNC)
		ki->ki_flags |= IOCB_DSYNC;
	if (flags & RWF_SYNC)
		ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
J
Jürg Billeter 已提交
3230 3231
	if (flags & RWF_APPEND)
		ki->ki_flags |= IOCB_APPEND;
3232 3233 3234
	return 0;
}

L
Linus Torvalds 已提交
3235 3236 3237 3238
static inline ino_t parent_ino(struct dentry *dentry)
{
	ino_t res;

N
Nick Piggin 已提交
3239 3240 3241 3242
	/*
	 * Don't strictly need d_lock here? If the parent ino could change
	 * then surely we'd have a deeper race in the caller?
	 */
L
Linus Torvalds 已提交
3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267
	spin_lock(&dentry->d_lock);
	res = dentry->d_parent->d_inode->i_ino;
	spin_unlock(&dentry->d_lock);
	return res;
}

/* Transaction based IO helpers */

/*
 * An argresp is stored in an allocated page and holds the
 * size of the argument or response, along with its content
 */
struct simple_transaction_argresp {
	ssize_t size;
	char data[0];
};

#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))

char *simple_transaction_get(struct file *file, const char __user *buf,
				size_t size);
ssize_t simple_transaction_read(struct file *file, char __user *buf,
				size_t size, loff_t *pos);
int simple_transaction_release(struct inode *inode, struct file *file);

3268
void simple_transaction_set(struct file *file, size_t n);
L
Linus Torvalds 已提交
3269

3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291
/*
 * simple attribute files
 *
 * These attributes behave similar to those in sysfs:
 *
 * Writing to an attribute immediately sets a value, an open file can be
 * written to multiple times.
 *
 * Reading from an attribute creates a buffer from the value that might get
 * read with multiple read calls. When the attribute has been read
 * completely, no further read calls are possible until the file is opened
 * again.
 *
 * All attributes contain a text representation of a numeric value
 * that are accessed with the get() and set() functions.
 */
#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)		\
static int __fops ## _open(struct inode *inode, struct file *file)	\
{									\
	__simple_attr_check_format(__fmt, 0ull);			\
	return simple_attr_open(inode, file, __get, __set, __fmt);	\
}									\
3292
static const struct file_operations __fops = {				\
3293 3294
	.owner	 = THIS_MODULE,						\
	.open	 = __fops ## _open,					\
3295
	.release = simple_attr_release,					\
3296 3297
	.read	 = simple_attr_read,					\
	.write	 = simple_attr_write,					\
3298
	.llseek	 = generic_file_llseek,					\
3299
}
3300

3301 3302
static inline __printf(1, 2)
void __simple_attr_check_format(const char *fmt, ...)
3303 3304 3305 3306 3307
{
	/* don't do anything, just let the compiler check the arguments; */
}

int simple_attr_open(struct inode *inode, struct file *file,
3308
		     int (*get)(void *, u64 *), int (*set)(void *, u64),
3309
		     const char *fmt);
3310
int simple_attr_release(struct inode *inode, struct file *file);
3311 3312 3313 3314 3315
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);

A
Alexey Dobriyan 已提交
3316
struct ctl_table;
3317
int proc_nr_files(struct ctl_table *table, int write,
3318
		  void __user *buffer, size_t *lenp, loff_t *ppos);
3319 3320
int proc_nr_dentry(struct ctl_table *table, int write,
		  void __user *buffer, size_t *lenp, loff_t *ppos);
3321 3322
int proc_nr_inodes(struct ctl_table *table, int write,
		   void __user *buffer, size_t *lenp, loff_t *ppos);
3323
int __init get_filesystem_list(char *buf);
3324

N
Namhyung Kim 已提交
3325
#define __FMODE_EXEC		((__force int) FMODE_EXEC)
3326 3327
#define __FMODE_NONOTIFY	((__force int) FMODE_NONOTIFY)

A
Al Viro 已提交
3328
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
E
Eric Paris 已提交
3329
#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
3330
					    (flag & __FMODE_NONOTIFY)))
A
Al Viro 已提交
3331

Y
Yaowei Bai 已提交
3332
static inline bool is_sxid(umode_t mode)
3333 3334 3335 3336
{
	return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
}

M
Miklos Szeredi 已提交
3337 3338 3339 3340 3341 3342 3343 3344
static inline int check_sticky(struct inode *dir, struct inode *inode)
{
	if (!(dir->i_mode & S_ISVTX))
		return 0;

	return __check_sticky(dir, inode);
}

3345 3346
static inline void inode_has_no_xattr(struct inode *inode)
{
3347
	if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_NOSEC))
3348 3349 3350
		inode->i_flags |= S_NOSEC;
}

A
Al Viro 已提交
3351 3352 3353 3354 3355
static inline bool is_root_inode(struct inode *inode)
{
	return inode == inode->i_sb->s_root->d_inode;
}

3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385
static inline bool dir_emit(struct dir_context *ctx,
			    const char *name, int namelen,
			    u64 ino, unsigned type)
{
	return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
}
static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
{
	return ctx->actor(ctx, ".", 1, ctx->pos,
			  file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
}
static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
{
	return ctx->actor(ctx, "..", 2, ctx->pos,
			  parent_ino(file->f_path.dentry), DT_DIR) == 0;
}
static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
{
	if (ctx->pos == 0) {
		if (!dir_emit_dot(file, ctx))
			return false;
		ctx->pos = 1;
	}
	if (ctx->pos == 1) {
		if (!dir_emit_dotdot(file, ctx))
			return false;
		ctx->pos = 2;
	}
	return true;
}
A
Al Viro 已提交
3386 3387
static inline bool dir_relax(struct inode *inode)
{
A
Al Viro 已提交
3388 3389
	inode_unlock(inode);
	inode_lock(inode);
A
Al Viro 已提交
3390 3391
	return !IS_DEADDIR(inode);
}
3392

A
Al Viro 已提交
3393 3394 3395 3396 3397 3398 3399
static inline bool dir_relax_shared(struct inode *inode)
{
	inode_unlock_shared(inode);
	inode_lock_shared(inode);
	return !IS_DEADDIR(inode);
}

3400
extern bool path_noexec(const struct path *path);
3401
extern void inode_nohighmem(struct inode *inode);
3402

L
Linus Torvalds 已提交
3403
#endif /* _LINUX_FS_H */