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-rw-r--r--include/linux/fs.h2605
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diff --git a/include/linux/fs.h b/include/linux/fs.h
new file mode 100644
index 00000000..96b10354
--- /dev/null
+++ b/include/linux/fs.h
@@ -0,0 +1,2605 @@
+#ifndef _LINUX_FS_H
+#define _LINUX_FS_H
+
+/*
+ * This file has definitions for some important file table
+ * structures etc.
+ */
+
+#include <linux/limits.h>
+#include <linux/ioctl.h>
+#include <linux/blk_types.h>
+#include <linux/types.h>
+
+/*
+ * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
+ * the file limit at runtime and only root can increase the per-process
+ * nr_file rlimit, so it's safe to set up a ridiculously high absolute
+ * upper limit on files-per-process.
+ *
+ * Some programs (notably those using select()) may have to be
+ * recompiled to take full advantage of the new limits..
+ */
+
+/* Fixed constants first: */
+#undef NR_OPEN
+#define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */
+#define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
+
+#define BLOCK_SIZE_BITS 10
+#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
+
+#define SEEK_SET 0 /* seek relative to beginning of file */
+#define SEEK_CUR 1 /* seek relative to current file position */
+#define SEEK_END 2 /* seek relative to end of file */
+#define SEEK_MAX SEEK_END
+
+struct fstrim_range {
+ __u64 start;
+ __u64 len;
+ __u64 minlen;
+};
+
+/* And dynamically-tunable limits and defaults: */
+struct files_stat_struct {
+ unsigned long nr_files; /* read only */
+ unsigned long nr_free_files; /* read only */
+ unsigned long max_files; /* tunable */
+};
+
+struct inodes_stat_t {
+ int nr_inodes;
+ int nr_unused;
+ int dummy[5]; /* padding for sysctl ABI compatibility */
+};
+
+
+#define NR_FILE 8192 /* this can well be larger on a larger system */
+
+#define MAY_EXEC 1
+#define MAY_WRITE 2
+#define MAY_READ 4
+#define MAY_APPEND 8
+#define MAY_ACCESS 16
+#define MAY_OPEN 32
+#define MAY_CHDIR 64
+
+/*
+ * 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)
+
+/*
+ * Don't update ctime and mtime.
+ *
+ * Currently a special hack for the XFS open_by_handle ioctl, but we'll
+ * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
+ */
+#define FMODE_NOCMTIME ((__force fmode_t)0x800)
+
+/* Expect random access pattern */
+#define FMODE_RANDOM ((__force fmode_t)0x1000)
+
+/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
+#define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
+
+/* File is opened with O_PATH; almost nothing can be done with it */
+#define FMODE_PATH ((__force fmode_t)0x4000)
+
+/* File was opened by fanotify and shouldn't generate fanotify events */
+#define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
+
+/*
+ * The below are the various read and write types that we support. Some of
+ * them include behavioral modifiers that send information down to the
+ * block layer and IO scheduler. Terminology:
+ *
+ * The block layer uses device plugging to defer IO a little bit, in
+ * the hope that we will see more IO very shortly. This increases
+ * coalescing of adjacent IO and thus reduces the number of IOs we
+ * have to send to the device. It also allows for better queuing,
+ * if the IO isn't mergeable. If the caller is going to be waiting
+ * for the IO, then he must ensure that the device is unplugged so
+ * that the IO is dispatched to the driver.
+ *
+ * All IO is handled async in Linux. This is fine for background
+ * writes, but for reads or writes that someone waits for completion
+ * on, we want to notify the block layer and IO scheduler so that they
+ * know about it. That allows them to make better scheduling
+ * decisions. So when the below references 'sync' and 'async', it
+ * is referencing this priority hint.
+ *
+ * With that in mind, the available types are:
+ *
+ * READ A normal read operation. Device will be plugged.
+ * READ_SYNC A synchronous read. Device is not plugged, caller can
+ * immediately wait on this read without caring about
+ * unplugging.
+ * READA Used for read-ahead operations. Lower priority, and the
+ * block layer could (in theory) choose to ignore this
+ * request if it runs into resource problems.
+ * WRITE A normal async write. Device will be plugged.
+ * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
+ * the hint that someone will be waiting on this IO
+ * shortly. The write equivalent of READ_SYNC.
+ * WRITE_ODIRECT Special case write for O_DIRECT only.
+ * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
+ * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
+ * non-volatile media on completion.
+ * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
+ * by a cache flush and data is guaranteed to be on
+ * non-volatile media on completion.
+ *
+ */
+#define RW_MASK REQ_WRITE
+#define RWA_MASK REQ_RAHEAD
+
+#define READ 0
+#define WRITE RW_MASK
+#define READA RWA_MASK
+
+#define READ_SYNC (READ | REQ_SYNC)
+#define READ_META (READ | REQ_META)
+#define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
+#define WRITE_ODIRECT (WRITE | REQ_SYNC)
+#define WRITE_META (WRITE | REQ_META)
+#define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
+#define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
+#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
+
+#define SEL_IN 1
+#define SEL_OUT 2
+#define SEL_EX 4
+
+/* public flags for file_system_type */
+#define FS_REQUIRES_DEV 1
+#define FS_BINARY_MOUNTDATA 2
+#define FS_HAS_SUBTYPE 4
+#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
+#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
+ * during rename() internally.
+ */
+
+/*
+ * These are the fs-independent mount-flags: up to 32 flags are supported
+ */
+#define MS_RDONLY 1 /* Mount read-only */
+#define MS_NOSUID 2 /* Ignore suid and sgid bits */
+#define MS_NODEV 4 /* Disallow access to device special files */
+#define MS_NOEXEC 8 /* Disallow program execution */
+#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
+#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
+#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
+#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
+#define MS_NOATIME 1024 /* Do not update access times. */
+#define MS_NODIRATIME 2048 /* Do not update directory access times */
+#define MS_BIND 4096
+#define MS_MOVE 8192
+#define MS_REC 16384
+#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
+ MS_VERBOSE is deprecated. */
+#define MS_SILENT 32768
+#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
+#define MS_UNBINDABLE (1<<17) /* change to unbindable */
+#define MS_PRIVATE (1<<18) /* change to private */
+#define MS_SLAVE (1<<19) /* change to slave */
+#define MS_SHARED (1<<20) /* change to shared */
+#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
+#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
+#define MS_I_VERSION (1<<23) /* Update inode I_version field */
+#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
+#define MS_NOSEC (1<<28)
+#define MS_BORN (1<<29)
+#define MS_ACTIVE (1<<30)
+#define MS_NOUSER (1<<31)
+
+/*
+ * Superblock flags that can be altered by MS_REMOUNT
+ */
+#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
+
+/*
+ * Old magic mount flag and mask
+ */
+#define MS_MGC_VAL 0xC0ED0000
+#define MS_MGC_MSK 0xffff0000
+
+/* Inode flags - they have nothing 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 */
+
+/*
+ * Note that nosuid etc flags are inode-specific: setting some file-system
+ * flags just means all the inodes inherit those flags by default. It might be
+ * possible to override it selectively if you really wanted to with some
+ * ioctl() that is not currently implemented.
+ *
+ * Exception: MS_RDONLY is always applied to the entire file system.
+ *
+ * Unfortunately, it is possible to change a filesystems flags with it mounted
+ * with files in use. This means that all of the inodes will not have their
+ * i_flags updated. Hence, i_flags no longer inherit the superblock mount
+ * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
+ */
+#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
+
+#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
+#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
+ ((inode)->i_flags & S_SYNC))
+#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
+ ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
+#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
+#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
+#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
+
+#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
+#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
+#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
+#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
+
+#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
+#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
+#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
+#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
+#define IS_IMA(inode) ((inode)->i_flags & S_IMA)
+#define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
+#define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
+
+/* the read-only stuff doesn't really belong here, but any other place is
+ probably as bad and I don't want to create yet another include file. */
+
+#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
+#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
+#define BLKRRPART _IO(0x12,95) /* re-read partition table */
+#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
+#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
+#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
+#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
+#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
+#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
+#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
+#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
+#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
+#if 0
+#define BLKPG _IO(0x12,105)/* See blkpg.h */
+
+/* Some people are morons. Do not use sizeof! */
+
+#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
+#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
+/* This was here just to show that the number is taken -
+ probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
+#endif
+/* A jump here: 108-111 have been used for various private purposes. */
+#define BLKBSZGET _IOR(0x12,112,size_t)
+#define BLKBSZSET _IOW(0x12,113,size_t)
+#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
+#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
+#define BLKTRACESTART _IO(0x12,116)
+#define BLKTRACESTOP _IO(0x12,117)
+#define BLKTRACETEARDOWN _IO(0x12,118)
+#define BLKDISCARD _IO(0x12,119)
+#define BLKIOMIN _IO(0x12,120)
+#define BLKIOOPT _IO(0x12,121)
+#define BLKALIGNOFF _IO(0x12,122)
+#define BLKPBSZGET _IO(0x12,123)
+#define BLKDISCARDZEROES _IO(0x12,124)
+#define BLKSECDISCARD _IO(0x12,125)
+
+#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
+#define FIBMAP _IO(0x00,1) /* bmap access */
+#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
+#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
+#define FITHAW _IOWR('X', 120, int) /* Thaw */
+#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
+
+#define FS_IOC_GETFLAGS _IOR('f', 1, long)
+#define FS_IOC_SETFLAGS _IOW('f', 2, long)
+#define FS_IOC_GETVERSION _IOR('v', 1, long)
+#define FS_IOC_SETVERSION _IOW('v', 2, long)
+#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
+#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
+#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
+#define FS_IOC32_GETVERSION _IOR('v', 1, int)
+#define FS_IOC32_SETVERSION _IOW('v', 2, int)
+
+/*
+ * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
+ */
+#define FS_SECRM_FL 0x00000001 /* Secure deletion */
+#define FS_UNRM_FL 0x00000002 /* Undelete */
+#define FS_COMPR_FL 0x00000004 /* Compress file */
+#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
+#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
+#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
+#define FS_NODUMP_FL 0x00000040 /* do not dump file */
+#define FS_NOATIME_FL 0x00000080 /* do not update atime */
+/* Reserved for compression usage... */
+#define FS_DIRTY_FL 0x00000100
+#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
+#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
+#define FS_ECOMPR_FL 0x00000800 /* Compression error */
+/* End compression flags --- maybe not all used */
+#define FS_BTREE_FL 0x00001000 /* btree format dir */
+#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
+#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
+#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
+#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
+#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
+#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
+#define FS_EXTENT_FL 0x00080000 /* Extents */
+#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
+#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
+#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
+
+#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
+#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
+
+
+#define SYNC_FILE_RANGE_WAIT_BEFORE 1
+#define SYNC_FILE_RANGE_WRITE 2
+#define SYNC_FILE_RANGE_WAIT_AFTER 4
+
+#ifdef __KERNEL__
+
+#include <linux/linkage.h>
+#include <linux/wait.h>
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/dcache.h>
+#include <linux/path.h>
+#include <linux/stat.h>
+#include <linux/cache.h>
+#include <linux/list.h>
+#include <linux/radix-tree.h>
+#include <linux/prio_tree.h>
+#include <linux/init.h>
+#include <linux/pid.h>
+#include <linux/mutex.h>
+#include <linux/capability.h>
+#include <linux/semaphore.h>
+#include <linux/fiemap.h>
+#include <linux/rculist_bl.h>
+
+#include <asm/atomic.h>
+#include <asm/byteorder.h>
+
+struct export_operations;
+struct hd_geometry;
+struct iovec;
+struct nameidata;
+struct kiocb;
+struct kobject;
+struct pipe_inode_info;
+struct poll_table_struct;
+struct kstatfs;
+struct vm_area_struct;
+struct vfsmount;
+struct cred;
+
+extern void __init inode_init(void);
+extern void __init inode_init_early(void);
+extern void __init files_init(unsigned long);
+
+extern struct files_stat_struct files_stat;
+extern unsigned long get_max_files(void);
+extern int sysctl_nr_open;
+extern struct inodes_stat_t inodes_stat;
+extern int leases_enable, lease_break_time;
+
+struct buffer_head;
+typedef int (get_block_t)(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create);
+typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
+ ssize_t bytes, void *private, int ret,
+ bool is_async);
+
+/*
+ * Attribute flags. These should be or-ed together to figure out what
+ * has been changed!
+ */
+#define ATTR_MODE (1 << 0)
+#define ATTR_UID (1 << 1)
+#define ATTR_GID (1 << 2)
+#define ATTR_SIZE (1 << 3)
+#define ATTR_ATIME (1 << 4)
+#define ATTR_MTIME (1 << 5)
+#define ATTR_CTIME (1 << 6)
+#define ATTR_ATIME_SET (1 << 7)
+#define ATTR_MTIME_SET (1 << 8)
+#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
+#define ATTR_ATTR_FLAG (1 << 10)
+#define ATTR_KILL_SUID (1 << 11)
+#define ATTR_KILL_SGID (1 << 12)
+#define ATTR_FILE (1 << 13)
+#define ATTR_KILL_PRIV (1 << 14)
+#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
+#define ATTR_TIMES_SET (1 << 16)
+
+/*
+ * 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;
+ uid_t ia_uid;
+ gid_t ia_gid;
+ loff_t ia_size;
+ struct timespec ia_atime;
+ struct timespec ia_mtime;
+ struct timespec ia_ctime;
+
+ /*
+ * Not an attribute, but an auxiliary info for filesystems wanting to
+ * implement an ftruncate() like method. NOTE: filesystem should
+ * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
+ */
+ struct file *ia_file;
+};
+
+/*
+ * Includes for diskquotas.
+ */
+#include <linux/quota.h>
+
+/**
+ * enum positive_aop_returns - aop return codes with specific semantics
+ *
+ * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
+ * completed, that the page is still locked, and
+ * should be considered active. The VM uses this hint
+ * to return the page to the active list -- it won't
+ * be a candidate for writeback again in the near
+ * future. Other callers must be careful to unlock
+ * the page if they get this return. Returned by
+ * writepage();
+ *
+ * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
+ * unlocked it and the page might have been truncated.
+ * The caller should back up to acquiring a new page and
+ * trying again. The aop will be taking reasonable
+ * precautions not to livelock. If the caller held a page
+ * reference, it should drop it before retrying. Returned
+ * by readpage().
+ *
+ * address_space_operation functions return these large constants to indicate
+ * special semantics to the caller. These are much larger than the bytes in a
+ * page to allow for functions that return the number of bytes operated on in a
+ * given page.
+ */
+
+enum positive_aop_returns {
+ AOP_WRITEPAGE_ACTIVATE = 0x80000,
+ AOP_TRUNCATED_PAGE = 0x80001,
+};
+
+#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
+#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
+#define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
+ * helper code (eg buffer layer)
+ * to clear GFP_FS from alloc */
+
+/*
+ * oh the beauties of C type declarations.
+ */
+struct page;
+struct address_space;
+struct writeback_control;
+
+struct iov_iter {
+ const struct iovec *iov;
+ unsigned long nr_segs;
+ size_t iov_offset;
+ size_t count;
+};
+
+size_t iov_iter_copy_from_user_atomic(struct page *page,
+ struct iov_iter *i, unsigned long offset, size_t bytes);
+size_t iov_iter_copy_from_user(struct page *page,
+ struct iov_iter *i, unsigned long offset, size_t bytes);
+void iov_iter_advance(struct iov_iter *i, size_t bytes);
+int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
+size_t iov_iter_single_seg_count(struct iov_iter *i);
+
+static inline void iov_iter_init(struct iov_iter *i,
+ const struct iovec *iov, unsigned long nr_segs,
+ size_t count, size_t written)
+{
+ i->iov = iov;
+ i->nr_segs = nr_segs;
+ i->iov_offset = 0;
+ i->count = count + written;
+
+ iov_iter_advance(i, written);
+}
+
+static inline size_t iov_iter_count(struct iov_iter *i)
+{
+ return i->count;
+}
+
+/*
+ * "descriptor" for what we're up to with a read.
+ * This allows us to use the same read code yet
+ * have multiple different users of the data that
+ * we read from a file.
+ *
+ * The simplest case just copies the data to user
+ * mode.
+ */
+typedef struct {
+ size_t written;
+ size_t count;
+ union {
+ char __user *buf;
+ void *data;
+ } arg;
+ int error;
+} read_descriptor_t;
+
+typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
+ unsigned long, unsigned long);
+
+struct address_space_operations {
+ int (*writepage)(struct page *page, struct writeback_control *wbc);
+ int (*readpage)(struct file *, struct page *);
+
+ /* Write back some dirty pages from this mapping. */
+ int (*writepages)(struct address_space *, struct writeback_control *);
+
+ /* Set a page dirty. Return true if this dirtied it */
+ int (*set_page_dirty)(struct page *page);
+
+ int (*readpages)(struct file *filp, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages);
+
+ int (*write_begin)(struct file *, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata);
+ int (*write_end)(struct file *, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata);
+
+ /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
+ sector_t (*bmap)(struct address_space *, sector_t);
+ void (*invalidatepage) (struct page *, unsigned long);
+ int (*releasepage) (struct page *, gfp_t);
+ void (*freepage)(struct page *);
+ ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
+ loff_t offset, unsigned long nr_segs);
+ int (*get_xip_mem)(struct address_space *, pgoff_t, int,
+ void **, unsigned long *);
+ /* migrate the contents of a page to the specified target */
+ int (*migratepage) (struct address_space *,
+ struct page *, struct page *);
+ int (*launder_page) (struct page *);
+ int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
+ unsigned long);
+ int (*error_remove_page)(struct address_space *, struct page *);
+};
+
+extern const struct address_space_operations empty_aops;
+
+/*
+ * pagecache_write_begin/pagecache_write_end must be used by general code
+ * to write into the pagecache.
+ */
+int pagecache_write_begin(struct file *, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata);
+
+int pagecache_write_end(struct file *, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata);
+
+struct backing_dev_info;
+struct address_space {
+ struct inode *host; /* owner: inode, block_device */
+ struct radix_tree_root page_tree; /* radix tree of all pages */
+ spinlock_t tree_lock; /* and lock protecting it */
+ unsigned int i_mmap_writable;/* count VM_SHARED mappings */
+ struct prio_tree_root i_mmap; /* tree of private and shared mappings */
+ struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
+ struct mutex i_mmap_mutex; /* protect tree, count, list */
+ /* Protected by tree_lock together with the radix tree */
+ unsigned long nrpages; /* number of total pages */
+ pgoff_t writeback_index;/* writeback starts here */
+ const struct address_space_operations *a_ops; /* methods */
+ unsigned long flags; /* error bits/gfp mask */
+ struct backing_dev_info *backing_dev_info; /* device readahead, etc */
+ spinlock_t private_lock; /* for use by the address_space */
+ struct list_head private_list; /* ditto */
+ struct address_space *assoc_mapping; /* ditto */
+} __attribute__((aligned(sizeof(long))));
+ /*
+ * On most architectures that alignment is already the case; but
+ * must be enforced here for CRIS, to let the least significant bit
+ * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
+ */
+
+struct block_device {
+ dev_t bd_dev; /* not a kdev_t - it's a search key */
+ int bd_openers;
+ struct inode * bd_inode; /* will die */
+ struct super_block * bd_super;
+ struct mutex bd_mutex; /* open/close mutex */
+ struct list_head bd_inodes;
+ void * bd_claiming;
+ void * bd_holder;
+ int bd_holders;
+ bool bd_write_holder;
+#ifdef CONFIG_SYSFS
+ struct list_head bd_holder_disks;
+#endif
+ struct block_device * bd_contains;
+ unsigned bd_block_size;
+ struct hd_struct * bd_part;
+ /* number of times partitions within this device have been opened. */
+ unsigned bd_part_count;
+ int bd_invalidated;
+ struct gendisk * bd_disk;
+ struct list_head bd_list;
+ /*
+ * Private data. You must have bd_claim'ed the block_device
+ * to use this. NOTE: bd_claim allows an owner to claim
+ * the same device multiple times, the owner must take special
+ * care to not mess up bd_private for that case.
+ */
+ unsigned long bd_private;
+
+ /* The counter of freeze processes */
+ int bd_fsfreeze_count;
+ /* Mutex for freeze */
+ struct mutex bd_fsfreeze_mutex;
+};
+
+/*
+ * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
+ * radix trees
+ */
+#define PAGECACHE_TAG_DIRTY 0
+#define PAGECACHE_TAG_WRITEBACK 1
+#define PAGECACHE_TAG_TOWRITE 2
+
+int mapping_tagged(struct address_space *mapping, int tag);
+
+/*
+ * Might pages of this file be mapped into userspace?
+ */
+static inline int mapping_mapped(struct address_space *mapping)
+{
+ return !prio_tree_empty(&mapping->i_mmap) ||
+ !list_empty(&mapping->i_mmap_nonlinear);
+}
+
+/*
+ * 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.
+ */
+static inline int mapping_writably_mapped(struct address_space *mapping)
+{
+ return mapping->i_mmap_writable != 0;
+}
+
+/*
+ * Use sequence counter to get consistent i_size on 32-bit processors.
+ */
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+#include <linux/seqlock.h>
+#define __NEED_I_SIZE_ORDERED
+#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
+#else
+#define i_size_ordered_init(inode) do { } while (0)
+#endif
+
+struct posix_acl;
+#define ACL_NOT_CACHED ((void *)(-1))
+
+struct inode {
+ /* RCU path lookup touches following: */
+ umode_t i_mode;
+ uid_t i_uid;
+ gid_t i_gid;
+ const struct inode_operations *i_op;
+ struct super_block *i_sb;
+
+ spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
+ unsigned int i_flags;
+ unsigned long i_state;
+#ifdef CONFIG_SECURITY
+ void *i_security;
+#endif
+ struct mutex i_mutex;
+
+
+ unsigned long dirtied_when; /* jiffies of first dirtying */
+
+ struct hlist_node i_hash;
+ struct list_head i_wb_list; /* backing dev IO list */
+ struct list_head i_lru; /* inode LRU list */
+ struct list_head i_sb_list;
+ union {
+ struct list_head i_dentry;
+ struct rcu_head i_rcu;
+ };
+ unsigned long i_ino;
+ atomic_t i_count;
+ unsigned int i_nlink;
+ dev_t i_rdev;
+ unsigned int i_blkbits;
+ u64 i_version;
+ loff_t i_size;
+#ifdef __NEED_I_SIZE_ORDERED
+ seqcount_t i_size_seqcount;
+#endif
+ struct timespec i_atime;
+ struct timespec i_mtime;
+ struct timespec i_ctime;
+ blkcnt_t i_blocks;
+ unsigned short i_bytes;
+ struct rw_semaphore i_alloc_sem;
+ const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
+ struct file_lock *i_flock;
+ struct address_space *i_mapping;
+ struct address_space i_data;
+#ifdef CONFIG_QUOTA
+ struct dquot *i_dquot[MAXQUOTAS];
+#endif
+ struct list_head i_devices;
+ union {
+ struct pipe_inode_info *i_pipe;
+ struct block_device *i_bdev;
+ struct cdev *i_cdev;
+ };
+
+ __u32 i_generation;
+
+#ifdef CONFIG_FSNOTIFY
+ __u32 i_fsnotify_mask; /* all events this inode cares about */
+ struct hlist_head i_fsnotify_marks;
+#endif
+
+#ifdef CONFIG_IMA
+ atomic_t i_readcount; /* struct files open RO */
+#endif
+ atomic_t i_writecount;
+#ifdef CONFIG_FS_POSIX_ACL
+ struct posix_acl *i_acl;
+ struct posix_acl *i_default_acl;
+#endif
+ void *i_private; /* fs or device private pointer */
+};
+
+static inline int inode_unhashed(struct inode *inode)
+{
+ return hlist_unhashed(&inode->i_hash);
+}
+
+/*
+ * inode->i_mutex nesting subclasses for the lock validator:
+ *
+ * 0: the object of the current VFS operation
+ * 1: parent
+ * 2: child/target
+ * 3: quota file
+ *
+ * The locking order between these classes is
+ * parent -> child -> normal -> xattr -> quota
+ */
+enum inode_i_mutex_lock_class
+{
+ I_MUTEX_NORMAL,
+ I_MUTEX_PARENT,
+ I_MUTEX_CHILD,
+ I_MUTEX_XATTR,
+ I_MUTEX_QUOTA
+};
+
+/*
+ * NOTE: in a 32bit arch with a preemptable kernel and
+ * an UP compile the i_size_read/write must be atomic
+ * with respect to the local cpu (unlike with preempt disabled),
+ * but they don't need to be atomic with respect to other cpus like in
+ * true SMP (so they need either to either locally disable irq around
+ * the read or for example on x86 they can be still implemented as a
+ * cmpxchg8b without the need of the lock prefix). For SMP compiles
+ * and 64bit archs it makes no difference if preempt is enabled or not.
+ */
+static inline loff_t i_size_read(const struct inode *inode)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ loff_t i_size;
+ unsigned int seq;
+
+ do {
+ seq = read_seqcount_begin(&inode->i_size_seqcount);
+ i_size = inode->i_size;
+ } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
+ return i_size;
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+ loff_t i_size;
+
+ preempt_disable();
+ i_size = inode->i_size;
+ preempt_enable();
+ return i_size;
+#else
+ return inode->i_size;
+#endif
+}
+
+/*
+ * NOTE: unlike i_size_read(), i_size_write() does need locking around it
+ * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
+ * can be lost, resulting in subsequent i_size_read() calls spinning forever.
+ */
+static inline void i_size_write(struct inode *inode, loff_t i_size)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ write_seqcount_begin(&inode->i_size_seqcount);
+ inode->i_size = i_size;
+ write_seqcount_end(&inode->i_size_seqcount);
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+ preempt_disable();
+ inode->i_size = i_size;
+ preempt_enable();
+#else
+ inode->i_size = i_size;
+#endif
+}
+
+static inline unsigned iminor(const struct inode *inode)
+{
+ return MINOR(inode->i_rdev);
+}
+
+static inline unsigned imajor(const struct inode *inode)
+{
+ return MAJOR(inode->i_rdev);
+}
+
+extern struct block_device *I_BDEV(struct inode *inode);
+
+struct fown_struct {
+ rwlock_t lock; /* protects pid, uid, euid fields */
+ struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
+ enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
+ uid_t uid, euid; /* uid/euid of process setting the owner */
+ int signum; /* posix.1b rt signal to be delivered on IO */
+};
+
+/*
+ * Track a single file's readahead state
+ */
+struct file_ra_state {
+ pgoff_t start; /* where readahead started */
+ unsigned int size; /* # of readahead pages */
+ unsigned int async_size; /* do asynchronous readahead when
+ there are only # of pages ahead */
+
+ unsigned int ra_pages; /* Maximum readahead window */
+ unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
+ loff_t prev_pos; /* Cache last read() position */
+};
+
+/*
+ * Check if @index falls in the readahead windows.
+ */
+static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
+{
+ return (index >= ra->start &&
+ index < ra->start + ra->size);
+}
+
+#define FILE_MNT_WRITE_TAKEN 1
+#define FILE_MNT_WRITE_RELEASED 2
+
+struct file {
+ /*
+ * fu_list becomes invalid after file_free is called and queued via
+ * fu_rcuhead for RCU freeing
+ */
+ union {
+ struct list_head fu_list;
+ struct rcu_head fu_rcuhead;
+ } f_u;
+ struct path f_path;
+#define f_dentry f_path.dentry
+#define f_vfsmnt f_path.mnt
+ const struct file_operations *f_op;
+ spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */
+#ifdef CONFIG_SMP
+ int f_sb_list_cpu;
+#endif
+ atomic_long_t f_count;
+ unsigned int f_flags;
+ fmode_t f_mode;
+ loff_t f_pos;
+ struct fown_struct f_owner;
+ const struct cred *f_cred;
+ struct file_ra_state f_ra;
+
+ u64 f_version;
+#ifdef CONFIG_SECURITY
+ void *f_security;
+#endif
+ /* needed for tty driver, and maybe others */
+ void *private_data;
+
+#ifdef CONFIG_EPOLL
+ /* Used by fs/eventpoll.c to link all the hooks to this file */
+ struct list_head f_ep_links;
+ struct list_head f_tfile_llink;
+#endif /* #ifdef CONFIG_EPOLL */
+ struct address_space *f_mapping;
+#ifdef CONFIG_DEBUG_WRITECOUNT
+ unsigned long f_mnt_write_state;
+#endif
+};
+
+struct file_handle {
+ __u32 handle_bytes;
+ int handle_type;
+ /* file identifier */
+ unsigned char f_handle[0];
+};
+
+#define get_file(x) atomic_long_inc(&(x)->f_count)
+#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
+#define file_count(x) atomic_long_read(&(x)->f_count)
+
+#ifdef CONFIG_DEBUG_WRITECOUNT
+static inline void file_take_write(struct file *f)
+{
+ WARN_ON(f->f_mnt_write_state != 0);
+ f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
+}
+static inline void file_release_write(struct file *f)
+{
+ f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
+}
+static inline void file_reset_write(struct file *f)
+{
+ f->f_mnt_write_state = 0;
+}
+static inline void file_check_state(struct file *f)
+{
+ /*
+ * At this point, either both or neither of these bits
+ * should be set.
+ */
+ WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
+ WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
+}
+static inline int file_check_writeable(struct file *f)
+{
+ if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
+ return 0;
+ printk(KERN_WARNING "writeable file with no "
+ "mnt_want_write()\n");
+ WARN_ON(1);
+ return -EINVAL;
+}
+#else /* !CONFIG_DEBUG_WRITECOUNT */
+static inline void file_take_write(struct file *filp) {}
+static inline void file_release_write(struct file *filp) {}
+static inline void file_reset_write(struct file *filp) {}
+static inline void file_check_state(struct file *filp) {}
+static inline int file_check_writeable(struct file *filp)
+{
+ return 0;
+}
+#endif /* CONFIG_DEBUG_WRITECOUNT */
+
+#define MAX_NON_LFS ((1UL<<31) - 1)
+
+/* Page cache limit. The filesystems should put that into their s_maxbytes
+ limits, otherwise bad things can happen in VM. */
+#if BITS_PER_LONG==32
+#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
+#elif BITS_PER_LONG==64
+#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
+#endif
+
+#define FL_POSIX 1
+#define FL_FLOCK 2
+#define FL_ACCESS 8 /* not trying to lock, just looking */
+#define FL_EXISTS 16 /* when unlocking, test for existence */
+#define FL_LEASE 32 /* lease held on this file */
+#define FL_CLOSE 64 /* unlock on close */
+#define FL_SLEEP 128 /* A blocking lock */
+
+/*
+ * Special return value from posix_lock_file() and vfs_lock_file() for
+ * asynchronous locking.
+ */
+#define FILE_LOCK_DEFERRED 1
+
+/*
+ * The POSIX file lock owner is determined by
+ * the "struct files_struct" in the thread group
+ * (or NULL for no owner - BSD locks).
+ *
+ * Lockd stuffs a "host" pointer into this.
+ */
+typedef struct files_struct *fl_owner_t;
+
+struct file_lock_operations {
+ void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
+ void (*fl_release_private)(struct file_lock *);
+};
+
+struct lock_manager_operations {
+ int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
+ void (*fl_notify)(struct file_lock *); /* unblock callback */
+ int (*fl_grant)(struct file_lock *, struct file_lock *, int);
+ void (*fl_release_private)(struct file_lock *);
+ void (*fl_break)(struct file_lock *);
+ int (*fl_change)(struct file_lock **, int);
+};
+
+struct lock_manager {
+ struct list_head list;
+};
+
+void locks_start_grace(struct lock_manager *);
+void locks_end_grace(struct lock_manager *);
+int locks_in_grace(void);
+
+/* that will die - we need it for nfs_lock_info */
+#include <linux/nfs_fs_i.h>
+
+struct file_lock {
+ struct file_lock *fl_next; /* singly linked list for this inode */
+ struct list_head fl_link; /* doubly linked list of all locks */
+ struct list_head fl_block; /* circular list of blocked processes */
+ fl_owner_t fl_owner;
+ unsigned char fl_flags;
+ unsigned char fl_type;
+ unsigned int fl_pid;
+ struct pid *fl_nspid;
+ wait_queue_head_t fl_wait;
+ struct file *fl_file;
+ loff_t fl_start;
+ loff_t fl_end;
+
+ struct fasync_struct * fl_fasync; /* for lease break notifications */
+ unsigned long fl_break_time; /* for nonblocking lease breaks */
+
+ const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
+ const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
+ union {
+ struct nfs_lock_info nfs_fl;
+ struct nfs4_lock_info nfs4_fl;
+ struct {
+ struct list_head link; /* link in AFS vnode's pending_locks list */
+ int state; /* state of grant or error if -ve */
+ } afs;
+ } fl_u;
+};
+
+/* The following constant reflects the upper bound of the file/locking space */
+#ifndef OFFSET_MAX
+#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
+#define OFFSET_MAX INT_LIMIT(loff_t)
+#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
+#endif
+
+#include <linux/fcntl.h>
+
+extern void send_sigio(struct fown_struct *fown, int fd, int band);
+
+#ifdef CONFIG_FILE_LOCKING
+extern int fcntl_getlk(struct file *, struct flock __user *);
+extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
+ struct flock __user *);
+
+#if BITS_PER_LONG == 32
+extern int fcntl_getlk64(struct file *, struct flock64 __user *);
+extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
+ struct flock64 __user *);
+#endif
+
+extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
+extern int fcntl_getlease(struct file *filp);
+
+/* fs/locks.c */
+void locks_free_lock(struct file_lock *fl);
+extern void locks_init_lock(struct file_lock *);
+extern struct file_lock * locks_alloc_lock(void);
+extern void locks_copy_lock(struct file_lock *, struct file_lock *);
+extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
+extern void locks_remove_posix(struct file *, fl_owner_t);
+extern void locks_remove_flock(struct file *);
+extern void locks_release_private(struct file_lock *);
+extern void posix_test_lock(struct file *, struct file_lock *);
+extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
+extern int posix_lock_file_wait(struct file *, struct file_lock *);
+extern int posix_unblock_lock(struct file *, struct file_lock *);
+extern int vfs_test_lock(struct file *, struct file_lock *);
+extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
+extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
+extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
+extern int __break_lease(struct inode *inode, unsigned int flags);
+extern void lease_get_mtime(struct inode *, struct timespec *time);
+extern int generic_setlease(struct file *, long, struct file_lock **);
+extern int vfs_setlease(struct file *, long, struct file_lock **);
+extern int lease_modify(struct file_lock **, int);
+extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
+extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
+extern void lock_flocks(void);
+extern void unlock_flocks(void);
+#else /* !CONFIG_FILE_LOCKING */
+static inline int fcntl_getlk(struct file *file, struct flock __user *user)
+{
+ return -EINVAL;
+}
+
+static inline int fcntl_setlk(unsigned int fd, struct file *file,
+ unsigned int cmd, struct flock __user *user)
+{
+ return -EACCES;
+}
+
+#if BITS_PER_LONG == 32
+static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
+{
+ return -EINVAL;
+}
+
+static inline int fcntl_setlk64(unsigned int fd, struct file *file,
+ unsigned int cmd, struct flock64 __user *user)
+{
+ return -EACCES;
+}
+#endif
+static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
+{
+ return 0;
+}
+
+static inline int fcntl_getlease(struct file *filp)
+{
+ return 0;
+}
+
+static inline void locks_init_lock(struct file_lock *fl)
+{
+ return;
+}
+
+static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
+{
+ return;
+}
+
+static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
+{
+ return;
+}
+
+static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
+{
+ return;
+}
+
+static inline void locks_remove_flock(struct file *filp)
+{
+ return;
+}
+
+static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
+{
+ return;
+}
+
+static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
+ struct file_lock *conflock)
+{
+ return -ENOLCK;
+}
+
+static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
+{
+ return -ENOLCK;
+}
+
+static inline int posix_unblock_lock(struct file *filp,
+ struct file_lock *waiter)
+{
+ return -ENOENT;
+}
+
+static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
+{
+ return 0;
+}
+
+static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
+ struct file_lock *fl, struct file_lock *conf)
+{
+ return -ENOLCK;
+}
+
+static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
+{
+ return 0;
+}
+
+static inline int flock_lock_file_wait(struct file *filp,
+ struct file_lock *request)
+{
+ return -ENOLCK;
+}
+
+static inline int __break_lease(struct inode *inode, unsigned int mode)
+{
+ return 0;
+}
+
+static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
+{
+ return;
+}
+
+static inline int generic_setlease(struct file *filp, long arg,
+ struct file_lock **flp)
+{
+ return -EINVAL;
+}
+
+static inline int vfs_setlease(struct file *filp, long arg,
+ struct file_lock **lease)
+{
+ return -EINVAL;
+}
+
+static inline int lease_modify(struct file_lock **before, int arg)
+{
+ return -EINVAL;
+}
+
+static inline int lock_may_read(struct inode *inode, loff_t start,
+ unsigned long len)
+{
+ return 1;
+}
+
+static inline int lock_may_write(struct inode *inode, loff_t start,
+ unsigned long len)
+{
+ return 1;
+}
+
+static inline void lock_flocks(void)
+{
+}
+
+static inline void unlock_flocks(void)
+{
+}
+
+#endif /* !CONFIG_FILE_LOCKING */
+
+
+struct fasync_struct {
+ spinlock_t fa_lock;
+ int magic;
+ int fa_fd;
+ struct fasync_struct *fa_next; /* singly linked list */
+ struct file *fa_file;
+ struct rcu_head fa_rcu;
+};
+
+#define FASYNC_MAGIC 0x4601
+
+/* SMP safe fasync helpers: */
+extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
+extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
+extern int fasync_remove_entry(struct file *, struct fasync_struct **);
+extern struct fasync_struct *fasync_alloc(void);
+extern void fasync_free(struct fasync_struct *);
+
+/* can be called from interrupts */
+extern void kill_fasync(struct fasync_struct **, int, int);
+
+extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
+extern int f_setown(struct file *filp, unsigned long arg, int force);
+extern void f_delown(struct file *filp);
+extern pid_t f_getown(struct file *filp);
+extern int send_sigurg(struct fown_struct *fown);
+
+/*
+ * Umount options
+ */
+
+#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
+#define MNT_DETACH 0x00000002 /* Just detach from the tree */
+#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
+#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
+#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
+
+extern struct list_head super_blocks;
+extern spinlock_t sb_lock;
+
+struct super_block {
+ struct list_head s_list; /* Keep this first */
+ dev_t s_dev; /* search index; _not_ kdev_t */
+ unsigned char s_dirt;
+ unsigned char s_blocksize_bits;
+ unsigned long s_blocksize;
+ loff_t s_maxbytes; /* Max file size */
+ struct file_system_type *s_type;
+ const struct super_operations *s_op;
+ const struct dquot_operations *dq_op;
+ const struct quotactl_ops *s_qcop;
+ const struct export_operations *s_export_op;
+ unsigned long s_flags;
+ unsigned long s_magic;
+ struct dentry *s_root;
+ struct rw_semaphore s_umount;
+ struct mutex s_lock;
+ int s_count;
+ atomic_t s_active;
+#ifdef CONFIG_SECURITY
+ void *s_security;
+#endif
+ const struct xattr_handler **s_xattr;
+
+ struct list_head s_inodes; /* all inodes */
+ struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */
+#ifdef CONFIG_SMP
+ struct list_head __percpu *s_files;
+#else
+ struct list_head s_files;
+#endif
+ /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
+ struct list_head s_dentry_lru; /* unused dentry lru */
+ int s_nr_dentry_unused; /* # of dentry on lru */
+
+ struct block_device *s_bdev;
+ struct backing_dev_info *s_bdi;
+ struct mtd_info *s_mtd;
+ struct list_head s_instances;
+ struct quota_info s_dquot; /* Diskquota specific options */
+
+ int s_frozen;
+ wait_queue_head_t s_wait_unfrozen;
+
+ char s_id[32]; /* Informational name */
+ u8 s_uuid[16]; /* UUID */
+
+ void *s_fs_info; /* Filesystem private info */
+ fmode_t s_mode;
+
+ /* Granularity of c/m/atime in ns.
+ Cannot be worse than a second */
+ u32 s_time_gran;
+
+ /*
+ * The next field is for VFS *only*. No filesystems have any business
+ * even looking at it. You had been warned.
+ */
+ struct mutex s_vfs_rename_mutex; /* Kludge */
+
+ /*
+ * Filesystem subtype. If non-empty the filesystem type field
+ * in /proc/mounts will be "type.subtype"
+ */
+ char *s_subtype;
+
+ /*
+ * Saved mount options for lazy filesystems using
+ * generic_show_options()
+ */
+ char __rcu *s_options;
+ const struct dentry_operations *s_d_op; /* default d_op for dentries */
+
+ /*
+ * Saved pool identifier for cleancache (-1 means none)
+ */
+ int cleancache_poolid;
+};
+
+extern struct timespec current_fs_time(struct super_block *sb);
+
+/*
+ * Snapshotting support.
+ */
+enum {
+ SB_UNFROZEN = 0,
+ SB_FREEZE_WRITE = 1,
+ SB_FREEZE_TRANS = 2,
+};
+
+#define vfs_check_frozen(sb, level) \
+ wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
+
+#define get_fs_excl() atomic_inc(&current->fs_excl)
+#define put_fs_excl() atomic_dec(&current->fs_excl)
+#define has_fs_excl() atomic_read(&current->fs_excl)
+
+/*
+ * until VFS tracks user namespaces for inodes, just make all files
+ * belong to init_user_ns
+ */
+extern struct user_namespace init_user_ns;
+#define inode_userns(inode) (&init_user_ns)
+extern bool inode_owner_or_capable(const struct inode *inode);
+
+/* not quite ready to be deprecated, but... */
+extern void lock_super(struct super_block *);
+extern void unlock_super(struct super_block *);
+
+/*
+ * VFS helper functions..
+ */
+extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
+extern int vfs_mkdir(struct inode *, struct dentry *, int);
+extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
+extern int vfs_symlink(struct inode *, struct dentry *, const char *);
+extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
+extern int vfs_rmdir(struct inode *, struct dentry *);
+extern int vfs_unlink(struct inode *, struct dentry *);
+extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
+
+/*
+ * VFS dentry helper functions.
+ */
+extern void dentry_unhash(struct dentry *dentry);
+
+/*
+ * VFS file helper functions.
+ */
+extern int file_permission(struct file *, int);
+extern void inode_init_owner(struct inode *inode, const struct inode *dir,
+ mode_t mode);
+/*
+ * VFS FS_IOC_FIEMAP helper definitions.
+ */
+struct fiemap_extent_info {
+ unsigned int fi_flags; /* Flags as passed from user */
+ unsigned int fi_extents_mapped; /* Number of mapped extents */
+ unsigned int fi_extents_max; /* Size of fiemap_extent array */
+ struct fiemap_extent __user *fi_extents_start; /* Start of
+ fiemap_extent array */
+};
+int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
+ u64 phys, u64 len, u32 flags);
+int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
+
+/*
+ * File types
+ *
+ * NOTE! These match bits 12..15 of stat.st_mode
+ * (ie "(i_mode >> 12) & 15").
+ */
+#define DT_UNKNOWN 0
+#define DT_FIFO 1
+#define DT_CHR 2
+#define DT_DIR 4
+#define DT_BLK 6
+#define DT_REG 8
+#define DT_LNK 10
+#define DT_SOCK 12
+#define DT_WHT 14
+
+/*
+ * This is the "filldir" function type, used by readdir() to let
+ * the kernel specify what kind of dirent layout it wants to have.
+ * This allows the kernel to read directories into kernel space or
+ * to have different dirent layouts depending on the binary type.
+ */
+typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
+struct block_device_operations;
+
+/* These macros are for out of kernel modules to test that
+ * the kernel supports the unlocked_ioctl and compat_ioctl
+ * fields in struct file_operations. */
+#define HAVE_COMPAT_IOCTL 1
+#define HAVE_UNLOCKED_IOCTL 1
+
+/*
+ * NOTE:
+ * all file operations except setlease can be called without
+ * the big kernel lock held in all filesystems.
+ */
+struct file_operations {
+ struct module *owner;
+ loff_t (*llseek) (struct file *, loff_t, int);
+ ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
+ ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
+ ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
+ ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
+ int (*readdir) (struct file *, void *, filldir_t);
+ unsigned int (*poll) (struct file *, struct poll_table_struct *);
+ long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
+ long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
+ int (*mmap) (struct file *, struct vm_area_struct *);
+ int (*open) (struct inode *, struct file *);
+ int (*flush) (struct file *, fl_owner_t id);
+ int (*release) (struct inode *, struct file *);
+ int (*fsync) (struct file *, int datasync);
+ int (*aio_fsync) (struct kiocb *, int datasync);
+ int (*fasync) (int, struct file *, int);
+ int (*lock) (struct file *, int, struct file_lock *);
+ ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
+ unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+ int (*check_flags)(int);
+ int (*flock) (struct file *, int, struct file_lock *);
+ ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
+ ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
+ int (*setlease)(struct file *, long, struct file_lock **);
+ long (*fallocate)(struct file *file, int mode, loff_t offset,
+ loff_t len);
+};
+
+#define IPERM_FLAG_RCU 0x0001
+
+struct inode_operations {
+ struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
+ void * (*follow_link) (struct dentry *, struct nameidata *);
+ int (*permission) (struct inode *, int, unsigned int);
+ int (*check_acl)(struct inode *, int, unsigned int);
+
+ int (*readlink) (struct dentry *, char __user *,int);
+ void (*put_link) (struct dentry *, struct nameidata *, void *);
+
+ int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
+ int (*link) (struct dentry *,struct inode *,struct dentry *);
+ int (*unlink) (struct inode *,struct dentry *);
+ int (*symlink) (struct inode *,struct dentry *,const char *);
+ int (*mkdir) (struct inode *,struct dentry *,int);
+ int (*rmdir) (struct inode *,struct dentry *);
+ int (*mknod) (struct inode *,struct dentry *,int,dev_t);
+ int (*rename) (struct inode *, struct dentry *,
+ struct inode *, struct dentry *);
+ void (*truncate) (struct inode *);
+ int (*setattr) (struct dentry *, struct iattr *);
+ int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
+ int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
+ ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
+ ssize_t (*listxattr) (struct dentry *, char *, size_t);
+ int (*removexattr) (struct dentry *, const char *);
+ void (*truncate_range)(struct inode *, loff_t, loff_t);
+ int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
+ u64 len);
+} ____cacheline_aligned;
+
+struct seq_file;
+
+ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
+ unsigned long nr_segs, unsigned long fast_segs,
+ struct iovec *fast_pointer,
+ struct iovec **ret_pointer);
+
+extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
+extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
+extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
+ unsigned long, loff_t *);
+extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
+ unsigned long, loff_t *);
+
+struct super_operations {
+ struct inode *(*alloc_inode)(struct super_block *sb);
+ void (*destroy_inode)(struct inode *);
+
+ void (*dirty_inode) (struct inode *, int flags);
+ int (*write_inode) (struct inode *, struct writeback_control *wbc);
+ int (*drop_inode) (struct inode *);
+ void (*evict_inode) (struct inode *);
+ void (*put_super) (struct super_block *);
+ void (*write_super) (struct super_block *);
+ int (*sync_fs)(struct super_block *sb, int wait);
+ int (*freeze_fs) (struct super_block *);
+ int (*unfreeze_fs) (struct super_block *);
+ int (*statfs) (struct dentry *, struct kstatfs *);
+ int (*remount_fs) (struct super_block *, int *, char *);
+ void (*umount_begin) (struct super_block *);
+
+ int (*show_options)(struct seq_file *, struct vfsmount *);
+ int (*show_devname)(struct seq_file *, struct vfsmount *);
+ int (*show_path)(struct seq_file *, struct vfsmount *);
+ int (*show_stats)(struct seq_file *, struct vfsmount *);
+#ifdef CONFIG_QUOTA
+ ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
+ ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
+#endif
+ int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
+};
+
+/*
+ * Inode state bits. Protected by inode->i_lock
+ *
+ * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
+ * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
+ *
+ * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
+ * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
+ * various stages of removing an inode.
+ *
+ * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
+ *
+ * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
+ * fdatasync(). i_atime is the usual cause.
+ * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
+ * these changes separately from I_DIRTY_SYNC so that we
+ * don't have to write inode on fdatasync() when only
+ * mtime has changed in it.
+ * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
+ * I_NEW Serves as both a mutex and completion notification.
+ * New inodes set I_NEW. If two processes both create
+ * the same inode, one of them will release its inode and
+ * wait for I_NEW to be released before returning.
+ * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
+ * also cause waiting on I_NEW, without I_NEW actually
+ * being set. find_inode() uses this to prevent returning
+ * nearly-dead inodes.
+ * I_WILL_FREE Must be set when calling write_inode_now() if i_count
+ * is zero. I_FREEING must be set when I_WILL_FREE is
+ * cleared.
+ * I_FREEING Set when inode is about to be freed but still has dirty
+ * pages or buffers attached or the inode itself is still
+ * dirty.
+ * I_CLEAR Added by end_writeback(). In this state the inode is clean
+ * and can be destroyed. Inode keeps I_FREEING.
+ *
+ * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
+ * prohibited for many purposes. iget() must wait for
+ * the inode to be completely released, then create it
+ * anew. Other functions will just ignore such inodes,
+ * if appropriate. I_NEW is used for waiting.
+ *
+ * I_SYNC Synchonized write of dirty inode data. The bits is
+ * set during data writeback, and cleared with a wakeup
+ * on the bit address once it is done.
+ *
+ * Q: What is the difference between I_WILL_FREE and I_FREEING?
+ */
+#define I_DIRTY_SYNC (1 << 0)
+#define I_DIRTY_DATASYNC (1 << 1)
+#define I_DIRTY_PAGES (1 << 2)
+#define __I_NEW 3
+#define I_NEW (1 << __I_NEW)
+#define I_WILL_FREE (1 << 4)
+#define I_FREEING (1 << 5)
+#define I_CLEAR (1 << 6)
+#define __I_SYNC 7
+#define I_SYNC (1 << __I_SYNC)
+#define I_REFERENCED (1 << 8)
+
+#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
+
+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);
+}
+
+/**
+ * inc_nlink - directly increment an inode's link count
+ * @inode: inode
+ *
+ * This is a low-level filesystem helper to replace any
+ * direct filesystem manipulation of i_nlink. Currently,
+ * it is only here for parity with dec_nlink().
+ */
+static inline void inc_nlink(struct inode *inode)
+{
+ inode->i_nlink++;
+}
+
+static inline void inode_inc_link_count(struct inode *inode)
+{
+ inc_nlink(inode);
+ mark_inode_dirty(inode);
+}
+
+/**
+ * drop_nlink - directly drop an inode's link count
+ * @inode: inode
+ *
+ * This is a low-level filesystem helper to replace any
+ * direct filesystem manipulation of i_nlink. In cases
+ * where we are attempting to track writes to the
+ * filesystem, a decrement to zero means an imminent
+ * write when the file is truncated and actually unlinked
+ * on the filesystem.
+ */
+static inline void drop_nlink(struct inode *inode)
+{
+ inode->i_nlink--;
+}
+
+/**
+ * clear_nlink - directly zero an inode's link count
+ * @inode: inode
+ *
+ * This is a low-level filesystem helper to replace any
+ * direct filesystem manipulation of i_nlink. See
+ * drop_nlink() for why we care about i_nlink hitting zero.
+ */
+static inline void clear_nlink(struct inode *inode)
+{
+ inode->i_nlink = 0;
+}
+
+static inline void inode_dec_link_count(struct inode *inode)
+{
+ drop_nlink(inode);
+ mark_inode_dirty(inode);
+}
+
+/**
+ * inode_inc_iversion - increments i_version
+ * @inode: inode that need to be updated
+ *
+ * Every time the inode is modified, the i_version field will be incremented.
+ * The filesystem has to be mounted with i_version flag
+ */
+
+static inline void inode_inc_iversion(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ inode->i_version++;
+ spin_unlock(&inode->i_lock);
+}
+
+extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
+static inline void file_accessed(struct file *file)
+{
+ if (!(file->f_flags & O_NOATIME))
+ touch_atime(file->f_path.mnt, file->f_path.dentry);
+}
+
+int sync_inode(struct inode *inode, struct writeback_control *wbc);
+int sync_inode_metadata(struct inode *inode, int wait);
+
+struct file_system_type {
+ const char *name;
+ int fs_flags;
+ struct dentry *(*mount) (struct file_system_type *, int,
+ const char *, void *);
+ void (*kill_sb) (struct super_block *);
+ struct module *owner;
+ struct file_system_type * next;
+ struct list_head fs_supers;
+
+ struct lock_class_key s_lock_key;
+ struct lock_class_key s_umount_key;
+ struct lock_class_key s_vfs_rename_key;
+
+ struct lock_class_key i_lock_key;
+ struct lock_class_key i_mutex_key;
+ struct lock_class_key i_mutex_dir_key;
+ struct lock_class_key i_alloc_sem_key;
+};
+
+extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
+ void *data, int (*fill_super)(struct super_block *, void *, int));
+extern struct dentry *mount_bdev(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data,
+ int (*fill_super)(struct super_block *, void *, int));
+extern struct dentry *mount_single(struct file_system_type *fs_type,
+ int flags, void *data,
+ int (*fill_super)(struct super_block *, void *, int));
+extern struct dentry *mount_nodev(struct file_system_type *fs_type,
+ int flags, void *data,
+ int (*fill_super)(struct super_block *, void *, int));
+void generic_shutdown_super(struct super_block *sb);
+void kill_block_super(struct super_block *sb);
+void kill_anon_super(struct super_block *sb);
+void kill_litter_super(struct super_block *sb);
+void deactivate_super(struct super_block *sb);
+void deactivate_locked_super(struct super_block *sb);
+int set_anon_super(struct super_block *s, void *data);
+struct super_block *sget(struct file_system_type *type,
+ int (*test)(struct super_block *,void *),
+ int (*set)(struct super_block *,void *),
+ void *data);
+extern struct dentry *mount_pseudo(struct file_system_type *, char *,
+ const struct super_operations *ops,
+ const struct dentry_operations *dops,
+ unsigned long);
+
+static inline void sb_mark_dirty(struct super_block *sb)
+{
+ sb->s_dirt = 1;
+}
+static inline void sb_mark_clean(struct super_block *sb)
+{
+ sb->s_dirt = 0;
+}
+static inline int sb_is_dirty(struct super_block *sb)
+{
+ return sb->s_dirt;
+}
+
+/* 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)
+
+extern int register_filesystem(struct file_system_type *);
+extern int unregister_filesystem(struct file_system_type *);
+extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
+#define kern_mount(type) kern_mount_data(type, NULL)
+extern int may_umount_tree(struct vfsmount *);
+extern int may_umount(struct vfsmount *);
+extern long do_mount(char *, char *, char *, unsigned long, void *);
+extern struct vfsmount *collect_mounts(struct path *);
+extern void drop_collected_mounts(struct vfsmount *);
+extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
+ struct vfsmount *);
+extern int vfs_statfs(struct path *, struct kstatfs *);
+extern int user_statfs(const char __user *, struct kstatfs *);
+extern int fd_statfs(int, struct kstatfs *);
+extern int statfs_by_dentry(struct dentry *, struct kstatfs *);
+extern int freeze_super(struct super_block *super);
+extern int thaw_super(struct super_block *super);
+extern bool our_mnt(struct vfsmount *mnt);
+
+extern int current_umask(void);
+
+/* /sys/fs */
+extern struct kobject *fs_kobj;
+
+#define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
+extern int rw_verify_area(int, struct file *, loff_t *, size_t);
+
+#define FLOCK_VERIFY_READ 1
+#define FLOCK_VERIFY_WRITE 2
+
+#ifdef CONFIG_FILE_LOCKING
+extern int locks_mandatory_locked(struct inode *);
+extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
+
+/*
+ * Candidates for mandatory locking have the setgid bit set
+ * but no group execute bit - an otherwise meaningless combination.
+ */
+
+static inline int __mandatory_lock(struct inode *ino)
+{
+ return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
+}
+
+/*
+ * ... and these candidates should be on MS_MANDLOCK mounted fs,
+ * otherwise these will be advisory locks
+ */
+
+static inline int mandatory_lock(struct inode *ino)
+{
+ return IS_MANDLOCK(ino) && __mandatory_lock(ino);
+}
+
+static inline int locks_verify_locked(struct inode *inode)
+{
+ if (mandatory_lock(inode))
+ return locks_mandatory_locked(inode);
+ return 0;
+}
+
+static inline int locks_verify_truncate(struct inode *inode,
+ struct file *filp,
+ loff_t size)
+{
+ if (inode->i_flock && mandatory_lock(inode))
+ return locks_mandatory_area(
+ FLOCK_VERIFY_WRITE, inode, filp,
+ size < inode->i_size ? size : inode->i_size,
+ (size < inode->i_size ? inode->i_size - size
+ : size - inode->i_size)
+ );
+ return 0;
+}
+
+static inline int break_lease(struct inode *inode, unsigned int mode)
+{
+ if (inode->i_flock)
+ return __break_lease(inode, mode);
+ return 0;
+}
+#else /* !CONFIG_FILE_LOCKING */
+static inline int locks_mandatory_locked(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int locks_mandatory_area(int rw, struct inode *inode,
+ struct file *filp, loff_t offset,
+ size_t count)
+{
+ return 0;
+}
+
+static inline int __mandatory_lock(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int mandatory_lock(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int locks_verify_locked(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
+ size_t size)
+{
+ return 0;
+}
+
+static inline int break_lease(struct inode *inode, unsigned int mode)
+{
+ return 0;
+}
+
+#endif /* CONFIG_FILE_LOCKING */
+
+/* fs/open.c */
+
+extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
+ struct file *filp);
+extern int do_fallocate(struct file *file, int mode, loff_t offset,
+ loff_t len);
+extern long do_sys_open(int dfd, const char __user *filename, int flags,
+ int mode);
+extern struct file *filp_open(const char *, int, int);
+extern struct file *file_open_root(struct dentry *, struct vfsmount *,
+ const char *, int);
+extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
+ const struct cred *);
+extern int filp_close(struct file *, fl_owner_t id);
+extern char * getname(const char __user *);
+
+/* fs/ioctl.c */
+
+extern int ioctl_preallocate(struct file *filp, void __user *argp);
+
+/* fs/dcache.c */
+extern void __init vfs_caches_init_early(void);
+extern void __init vfs_caches_init(unsigned long);
+
+extern struct kmem_cache *names_cachep;
+
+#define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
+#define __getname() __getname_gfp(GFP_KERNEL)
+#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
+#ifndef CONFIG_AUDITSYSCALL
+#define putname(name) __putname(name)
+#else
+extern void putname(const char *name);
+#endif
+
+#ifdef CONFIG_BLOCK
+extern int register_blkdev(unsigned int, const char *);
+extern void unregister_blkdev(unsigned int, const char *);
+extern struct block_device *bdget(dev_t);
+extern struct block_device *bdgrab(struct block_device *bdev);
+extern void bd_set_size(struct block_device *, loff_t size);
+extern sector_t blkdev_max_block(struct block_device *bdev);
+extern void bd_forget(struct inode *inode);
+extern void bdput(struct block_device *);
+extern void invalidate_bdev(struct block_device *);
+extern int sync_blockdev(struct block_device *bdev);
+extern struct super_block *freeze_bdev(struct block_device *);
+extern void emergency_thaw_all(void);
+extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
+extern int fsync_bdev(struct block_device *);
+#else
+static inline void bd_forget(struct inode *inode) {}
+static inline int sync_blockdev(struct block_device *bdev) { return 0; }
+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;
+}
+#endif
+extern int sync_filesystem(struct super_block *);
+extern const struct file_operations def_blk_fops;
+extern const struct file_operations def_chr_fops;
+extern const struct file_operations bad_sock_fops;
+extern const struct file_operations def_fifo_fops;
+#ifdef CONFIG_BLOCK
+extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
+extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
+extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
+extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
+extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
+ void *holder);
+extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
+ void *holder);
+extern int blkdev_put(struct block_device *bdev, fmode_t mode);
+#ifdef CONFIG_SYSFS
+extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
+extern void bd_unlink_disk_holder(struct block_device *bdev,
+ struct gendisk *disk);
+#else
+static inline int bd_link_disk_holder(struct block_device *bdev,
+ struct gendisk *disk)
+{
+ return 0;
+}
+static inline void bd_unlink_disk_holder(struct block_device *bdev,
+ struct gendisk *disk)
+{
+}
+#endif
+#endif
+
+/* fs/char_dev.c */
+#define CHRDEV_MAJOR_HASH_SIZE 255
+extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
+extern int register_chrdev_region(dev_t, unsigned, const char *);
+extern int __register_chrdev(unsigned int major, unsigned int baseminor,
+ unsigned int count, const char *name,
+ const struct file_operations *fops);
+extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
+ unsigned int count, const char *name);
+extern void unregister_chrdev_region(dev_t, unsigned);
+extern void chrdev_show(struct seq_file *,off_t);
+
+static inline int register_chrdev(unsigned int major, const char *name,
+ const struct file_operations *fops)
+{
+ return __register_chrdev(major, 0, 256, name, fops);
+}
+
+static inline void unregister_chrdev(unsigned int major, const char *name)
+{
+ __unregister_chrdev(major, 0, 256, name);
+}
+
+/* fs/block_dev.c */
+#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
+#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
+
+#ifdef CONFIG_BLOCK
+#define BLKDEV_MAJOR_HASH_SIZE 255
+extern const char *__bdevname(dev_t, char *buffer);
+extern const char *bdevname(struct block_device *bdev, char *buffer);
+extern struct block_device *lookup_bdev(const char *);
+extern void blkdev_show(struct seq_file *,off_t);
+
+#else
+#define BLKDEV_MAJOR_HASH_SIZE 0
+#endif
+
+extern void init_special_inode(struct inode *, umode_t, dev_t);
+
+/* Invalid inode operations -- fs/bad_inode.c */
+extern void make_bad_inode(struct inode *);
+extern int is_bad_inode(struct inode *);
+
+extern const struct file_operations read_pipefifo_fops;
+extern const struct file_operations write_pipefifo_fops;
+extern const struct file_operations rdwr_pipefifo_fops;
+
+extern int fs_may_remount_ro(struct super_block *);
+
+#ifdef CONFIG_BLOCK
+/*
+ * return READ, READA, or WRITE
+ */
+#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
+
+/*
+ * return data direction, READ or WRITE
+ */
+#define bio_data_dir(bio) ((bio)->bi_rw & 1)
+
+extern void check_disk_size_change(struct gendisk *disk,
+ struct block_device *bdev);
+extern int revalidate_disk(struct gendisk *);
+extern int check_disk_change(struct block_device *);
+extern int __invalidate_device(struct block_device *, bool);
+extern int invalidate_partition(struct gendisk *, int);
+#endif
+unsigned long invalidate_mapping_pages(struct address_space *mapping,
+ pgoff_t start, pgoff_t end);
+
+static inline void invalidate_remote_inode(struct inode *inode)
+{
+ if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+ S_ISLNK(inode->i_mode))
+ invalidate_mapping_pages(inode->i_mapping, 0, -1);
+}
+extern int invalidate_inode_pages2(struct address_space *mapping);
+extern int invalidate_inode_pages2_range(struct address_space *mapping,
+ pgoff_t start, pgoff_t end);
+extern int write_inode_now(struct inode *, int);
+extern int filemap_fdatawrite(struct address_space *);
+extern int filemap_flush(struct address_space *);
+extern int filemap_fdatawait(struct address_space *);
+extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
+ loff_t lend);
+extern int filemap_write_and_wait(struct address_space *mapping);
+extern int filemap_write_and_wait_range(struct address_space *mapping,
+ loff_t lstart, loff_t lend);
+extern int __filemap_fdatawrite_range(struct address_space *mapping,
+ loff_t start, loff_t end, int sync_mode);
+extern int filemap_fdatawrite_range(struct address_space *mapping,
+ loff_t start, loff_t end);
+
+extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
+ int datasync);
+extern int vfs_fsync(struct file *file, int datasync);
+extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
+extern void sync_supers(void);
+extern void emergency_sync(void);
+extern void emergency_remount(void);
+#ifdef CONFIG_BLOCK
+extern sector_t bmap(struct inode *, sector_t);
+#endif
+extern int notify_change(struct dentry *, struct iattr *);
+extern int inode_permission(struct inode *, int);
+extern int generic_permission(struct inode *, int, unsigned int,
+ int (*check_acl)(struct inode *, int, unsigned int));
+
+static inline bool execute_ok(struct inode *inode)
+{
+ return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
+}
+
+extern int get_write_access(struct inode *);
+extern int deny_write_access(struct file *);
+static inline void put_write_access(struct inode * inode)
+{
+ atomic_dec(&inode->i_writecount);
+}
+static inline void allow_write_access(struct file *file)
+{
+ if (file)
+ atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
+}
+#ifdef CONFIG_IMA
+static inline void i_readcount_dec(struct inode *inode)
+{
+ BUG_ON(!atomic_read(&inode->i_readcount));
+ atomic_dec(&inode->i_readcount);
+}
+static inline void i_readcount_inc(struct inode *inode)
+{
+ atomic_inc(&inode->i_readcount);
+}
+#else
+static inline void i_readcount_dec(struct inode *inode)
+{
+ return;
+}
+static inline void i_readcount_inc(struct inode *inode)
+{
+ return;
+}
+#endif
+extern int do_pipe_flags(int *, int);
+extern struct file *create_read_pipe(struct file *f, int flags);
+extern struct file *create_write_pipe(int flags);
+extern void free_write_pipe(struct file *);
+
+extern int kernel_read(struct file *, loff_t, char *, unsigned long);
+extern struct file * open_exec(const char *);
+
+/* fs/dcache.c -- generic fs support functions */
+extern int is_subdir(struct dentry *, struct dentry *);
+extern int path_is_under(struct path *, struct path *);
+extern ino_t find_inode_number(struct dentry *, struct qstr *);
+
+#include <linux/err.h>
+
+/* needed for stackable file system support */
+extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
+
+extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
+
+extern int inode_init_always(struct super_block *, struct inode *);
+extern void inode_init_once(struct inode *);
+extern void address_space_init_once(struct address_space *mapping);
+extern void ihold(struct inode * inode);
+extern void iput(struct inode *);
+extern struct inode * igrab(struct inode *);
+extern ino_t iunique(struct super_block *, ino_t);
+extern int inode_needs_sync(struct inode *inode);
+extern int generic_delete_inode(struct inode *inode);
+extern int generic_drop_inode(struct inode *inode);
+
+extern struct inode *ilookup5_nowait(struct super_block *sb,
+ unsigned long hashval, int (*test)(struct inode *, void *),
+ void *data);
+extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
+ int (*test)(struct inode *, void *), void *data);
+extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
+
+extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
+extern struct inode * iget_locked(struct super_block *, unsigned long);
+extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
+extern int insert_inode_locked(struct inode *);
+extern void unlock_new_inode(struct inode *);
+extern unsigned int get_next_ino(void);
+
+extern void __iget(struct inode * inode);
+extern void iget_failed(struct inode *);
+extern void end_writeback(struct inode *);
+extern void __destroy_inode(struct inode *);
+extern struct inode *new_inode(struct super_block *);
+extern void free_inode_nonrcu(struct inode *inode);
+extern int should_remove_suid(struct dentry *);
+extern int file_remove_suid(struct file *);
+
+extern void __insert_inode_hash(struct inode *, unsigned long hashval);
+extern void remove_inode_hash(struct inode *);
+static inline void insert_inode_hash(struct inode *inode)
+{
+ __insert_inode_hash(inode, inode->i_ino);
+}
+extern void inode_sb_list_add(struct inode *inode);
+
+#ifdef CONFIG_BLOCK
+extern void submit_bio(int, struct bio *);
+extern int bdev_read_only(struct block_device *);
+#endif
+extern int set_blocksize(struct block_device *, int);
+extern int sb_set_blocksize(struct super_block *, int);
+extern int sb_min_blocksize(struct super_block *, int);
+
+extern int generic_file_mmap(struct file *, struct vm_area_struct *);
+extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
+extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
+int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
+extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
+extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
+ loff_t *);
+extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
+extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
+ unsigned long *, loff_t, loff_t *, size_t, size_t);
+extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
+ unsigned long, loff_t, loff_t *, size_t, ssize_t);
+extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
+extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
+extern int generic_segment_checks(const struct iovec *iov,
+ unsigned long *nr_segs, size_t *count, int access_flags);
+
+/* fs/block_dev.c */
+extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos);
+extern int blkdev_fsync(struct file *filp, int datasync);
+
+/* fs/splice.c */
+extern ssize_t generic_file_splice_read(struct file *, loff_t *,
+ struct pipe_inode_info *, size_t, unsigned int);
+extern ssize_t default_file_splice_read(struct file *, loff_t *,
+ struct pipe_inode_info *, size_t, unsigned int);
+extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
+ struct file *, loff_t *, size_t, unsigned int);
+extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
+ struct file *out, loff_t *, size_t len, unsigned int flags);
+extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
+ size_t len, unsigned int flags);
+
+extern void
+file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
+extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
+extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
+extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
+extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
+ int origin);
+extern int generic_file_open(struct inode * inode, struct file * filp);
+extern int nonseekable_open(struct inode * inode, struct file * filp);
+
+#ifdef CONFIG_FS_XIP
+extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
+ loff_t *ppos);
+extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
+extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
+ size_t len, loff_t *ppos);
+extern int xip_truncate_page(struct address_space *mapping, loff_t from);
+#else
+static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_BLOCK
+typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
+ loff_t file_offset);
+
+enum {
+ /* need locking between buffered and direct access */
+ DIO_LOCKING = 0x01,
+
+ /* filesystem does not support filling holes */
+ DIO_SKIP_HOLES = 0x02,
+};
+
+void dio_end_io(struct bio *bio, int error);
+
+ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
+ struct block_device *bdev, const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
+ dio_submit_t submit_io, int flags);
+
+static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
+ struct inode *inode, struct block_device *bdev, const struct iovec *iov,
+ loff_t offset, unsigned long nr_segs, get_block_t get_block,
+ dio_iodone_t end_io)
+{
+ return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
+ nr_segs, get_block, end_io, NULL,
+ DIO_LOCKING | DIO_SKIP_HOLES);
+}
+#endif
+
+extern const struct file_operations generic_ro_fops;
+
+#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
+
+extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
+extern int vfs_follow_link(struct nameidata *, const char *);
+extern int page_readlink(struct dentry *, char __user *, int);
+extern void *page_follow_link_light(struct dentry *, struct nameidata *);
+extern void page_put_link(struct dentry *, struct nameidata *, void *);
+extern int __page_symlink(struct inode *inode, const char *symname, int len,
+ int nofs);
+extern int page_symlink(struct inode *inode, const char *symname, int len);
+extern const struct inode_operations page_symlink_inode_operations;
+extern int generic_readlink(struct dentry *, char __user *, int);
+extern void generic_fillattr(struct inode *, struct kstat *);
+extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
+void __inode_add_bytes(struct inode *inode, loff_t bytes);
+void inode_add_bytes(struct inode *inode, loff_t bytes);
+void inode_sub_bytes(struct inode *inode, loff_t bytes);
+loff_t inode_get_bytes(struct inode *inode);
+void inode_set_bytes(struct inode *inode, loff_t bytes);
+
+extern int vfs_readdir(struct file *, filldir_t, void *);
+
+extern int vfs_stat(const char __user *, struct kstat *);
+extern int vfs_lstat(const char __user *, struct kstat *);
+extern int vfs_fstat(unsigned int, struct kstat *);
+extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
+
+extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
+ unsigned long arg);
+extern int __generic_block_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo,
+ loff_t start, loff_t len,
+ get_block_t *get_block);
+extern int generic_block_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo, u64 start,
+ u64 len, get_block_t *get_block);
+
+extern void get_filesystem(struct file_system_type *fs);
+extern void put_filesystem(struct file_system_type *fs);
+extern struct file_system_type *get_fs_type(const char *name);
+extern struct super_block *get_super(struct block_device *);
+extern struct super_block *get_active_super(struct block_device *bdev);
+extern struct super_block *user_get_super(dev_t);
+extern void drop_super(struct super_block *sb);
+extern void iterate_supers(void (*)(struct super_block *, void *), void *);
+
+extern int dcache_dir_open(struct inode *, struct file *);
+extern int dcache_dir_close(struct inode *, struct file *);
+extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
+extern int dcache_readdir(struct file *, void *, filldir_t);
+extern int simple_setattr(struct dentry *, struct iattr *);
+extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
+extern int simple_statfs(struct dentry *, struct kstatfs *);
+extern int simple_link(struct dentry *, struct inode *, struct dentry *);
+extern int simple_unlink(struct inode *, struct dentry *);
+extern int simple_rmdir(struct inode *, struct dentry *);
+extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
+extern int noop_fsync(struct file *, int);
+extern int simple_empty(struct dentry *);
+extern int simple_readpage(struct file *file, struct page *page);
+extern int simple_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata);
+extern int simple_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata);
+
+extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
+extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
+extern const struct file_operations simple_dir_operations;
+extern const struct inode_operations simple_dir_inode_operations;
+struct tree_descr { char *name; const struct file_operations *ops; int mode; };
+struct dentry *d_alloc_name(struct dentry *, const char *);
+extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
+extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
+extern void simple_release_fs(struct vfsmount **mount, int *count);
+
+extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
+ loff_t *ppos, const void *from, size_t available);
+extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
+ const void __user *from, size_t count);
+
+extern int generic_file_fsync(struct file *, int);
+
+extern int generic_check_addressable(unsigned, u64);
+
+#ifdef CONFIG_MIGRATION
+extern int buffer_migrate_page(struct address_space *,
+ struct page *, struct page *);
+#else
+#define buffer_migrate_page NULL
+#endif
+
+extern int inode_change_ok(const struct inode *, struct iattr *);
+extern int inode_newsize_ok(const struct inode *, loff_t offset);
+extern void setattr_copy(struct inode *inode, const struct iattr *attr);
+
+extern void file_update_time(struct file *file);
+
+extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
+extern void save_mount_options(struct super_block *sb, char *options);
+extern void replace_mount_options(struct super_block *sb, char *options);
+
+static inline ino_t parent_ino(struct dentry *dentry)
+{
+ ino_t res;
+
+ /*
+ * Don't strictly need d_lock here? If the parent ino could change
+ * then surely we'd have a deeper race in the caller?
+ */
+ spin_lock(&dentry->d_lock);
+ res = dentry->d_parent->d_inode->i_ino;
+ spin_unlock(&dentry->d_lock);
+ return res;
+}
+
+/* Transaction based IO helpers */
+
+/*
+ * An argresp is stored in an allocated page and holds the
+ * size of the argument or response, along with its content
+ */
+struct simple_transaction_argresp {
+ ssize_t size;
+ char data[0];
+};
+
+#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
+
+char *simple_transaction_get(struct file *file, const char __user *buf,
+ size_t size);
+ssize_t simple_transaction_read(struct file *file, char __user *buf,
+ size_t size, loff_t *pos);
+int simple_transaction_release(struct inode *inode, struct file *file);
+
+void simple_transaction_set(struct file *file, size_t n);
+
+/*
+ * simple attribute files
+ *
+ * These attributes behave similar to those in sysfs:
+ *
+ * Writing to an attribute immediately sets a value, an open file can be
+ * written to multiple times.
+ *
+ * Reading from an attribute creates a buffer from the value that might get
+ * read with multiple read calls. When the attribute has been read
+ * completely, no further read calls are possible until the file is opened
+ * again.
+ *
+ * All attributes contain a text representation of a numeric value
+ * that are accessed with the get() and set() functions.
+ */
+#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
+static int __fops ## _open(struct inode *inode, struct file *file) \
+{ \
+ __simple_attr_check_format(__fmt, 0ull); \
+ return simple_attr_open(inode, file, __get, __set, __fmt); \
+} \
+static const struct file_operations __fops = { \
+ .owner = THIS_MODULE, \
+ .open = __fops ## _open, \
+ .release = simple_attr_release, \
+ .read = simple_attr_read, \
+ .write = simple_attr_write, \
+ .llseek = generic_file_llseek, \
+};
+
+static inline void __attribute__((format(printf, 1, 2)))
+__simple_attr_check_format(const char *fmt, ...)
+{
+ /* don't do anything, just let the compiler check the arguments; */
+}
+
+int simple_attr_open(struct inode *inode, struct file *file,
+ int (*get)(void *, u64 *), int (*set)(void *, u64),
+ const char *fmt);
+int simple_attr_release(struct inode *inode, struct file *file);
+ssize_t simple_attr_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos);
+ssize_t simple_attr_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *ppos);
+
+struct ctl_table;
+int proc_nr_files(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+int proc_nr_dentry(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+int proc_nr_inodes(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+int __init get_filesystem_list(char *buf);
+
+#define __FMODE_EXEC ((__force int) FMODE_EXEC)
+#define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
+
+#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
+#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
+ (flag & __FMODE_NONOTIFY)))
+
+static inline int is_sxid(mode_t mode)
+{
+ return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
+}
+
+static inline void inode_has_no_xattr(struct inode *inode)
+{
+ if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
+ inode->i_flags |= S_NOSEC;
+}
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_FS_H */