f446daaea9
We try to avoid livelocks of writeback when some steadily creates dirty pages in a mapping we are writing out. For memory-cleaning writeback, using nr_to_write works reasonably well but we cannot really use it for data integrity writeback. This patch tries to solve the problem. The idea is simple: Tag all pages that should be written back with a special tag (TOWRITE) in the radix tree. This can be done rather quickly and thus livelocks should not happen in practice. Then we start doing the hard work of locking pages and sending them to disk only for those pages that have TOWRITE tag set. Note: Adding new radix tree tag grows radix tree node from 288 to 296 bytes for 32-bit archs and from 552 to 560 bytes for 64-bit archs. However, the number of slab/slub items per page remains the same (13 and 7 respectively). Signed-off-by: Jan Kara <jack@suse.cz> Cc: Dave Chinner <david@fromorbit.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Chris Mason <chris.mason@oracle.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2522 lines
86 KiB
C
2522 lines
86 KiB
C
#ifndef _LINUX_FS_H
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#define _LINUX_FS_H
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/*
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* This file has definitions for some important file table
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* structures etc.
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*/
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#include <linux/limits.h>
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#include <linux/ioctl.h>
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/*
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* It's silly to have NR_OPEN bigger than NR_FILE, but you can change
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* the file limit at runtime and only root can increase the per-process
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* nr_file rlimit, so it's safe to set up a ridiculously high absolute
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* upper limit on files-per-process.
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*
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* Some programs (notably those using select()) may have to be
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* recompiled to take full advantage of the new limits..
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*/
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/* Fixed constants first: */
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#undef NR_OPEN
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#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
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#define BLOCK_SIZE_BITS 10
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#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
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#define SEEK_SET 0 /* seek relative to beginning of file */
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#define SEEK_CUR 1 /* seek relative to current file position */
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#define SEEK_END 2 /* seek relative to end of file */
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#define SEEK_MAX SEEK_END
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/* And dynamically-tunable limits and defaults: */
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struct files_stat_struct {
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int nr_files; /* read only */
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int nr_free_files; /* read only */
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int max_files; /* tunable */
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};
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struct inodes_stat_t {
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int nr_inodes;
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int nr_unused;
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int dummy[5]; /* padding for sysctl ABI compatibility */
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};
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#define NR_FILE 8192 /* this can well be larger on a larger system */
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#define MAY_EXEC 1
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#define MAY_WRITE 2
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#define MAY_READ 4
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#define MAY_APPEND 8
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#define MAY_ACCESS 16
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#define MAY_OPEN 32
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#define MAY_CHDIR 64
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/*
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* flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
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* to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
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*/
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/* file is open for reading */
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#define FMODE_READ ((__force fmode_t)0x1)
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/* file is open for writing */
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#define FMODE_WRITE ((__force fmode_t)0x2)
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/* file is seekable */
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#define FMODE_LSEEK ((__force fmode_t)0x4)
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/* file can be accessed using pread */
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#define FMODE_PREAD ((__force fmode_t)0x8)
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/* file can be accessed using pwrite */
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#define FMODE_PWRITE ((__force fmode_t)0x10)
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/* File is opened for execution with sys_execve / sys_uselib */
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#define FMODE_EXEC ((__force fmode_t)0x20)
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/* File is opened with O_NDELAY (only set for block devices) */
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#define FMODE_NDELAY ((__force fmode_t)0x40)
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/* File is opened with O_EXCL (only set for block devices) */
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#define FMODE_EXCL ((__force fmode_t)0x80)
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/* File is opened using open(.., 3, ..) and is writeable only for ioctls
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(specialy hack for floppy.c) */
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#define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
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/*
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* Don't update ctime and mtime.
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*
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* Currently a special hack for the XFS open_by_handle ioctl, but we'll
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* hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
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*/
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#define FMODE_NOCMTIME ((__force fmode_t)0x800)
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/* Expect random access pattern */
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#define FMODE_RANDOM ((__force fmode_t)0x1000)
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/*
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* The below are the various read and write types that we support. Some of
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* them include behavioral modifiers that send information down to the
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* block layer and IO scheduler. Terminology:
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*
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* The block layer uses device plugging to defer IO a little bit, in
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* the hope that we will see more IO very shortly. This increases
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* coalescing of adjacent IO and thus reduces the number of IOs we
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* have to send to the device. It also allows for better queuing,
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* if the IO isn't mergeable. If the caller is going to be waiting
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* for the IO, then he must ensure that the device is unplugged so
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* that the IO is dispatched to the driver.
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*
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* All IO is handled async in Linux. This is fine for background
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* writes, but for reads or writes that someone waits for completion
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* on, we want to notify the block layer and IO scheduler so that they
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* know about it. That allows them to make better scheduling
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* decisions. So when the below references 'sync' and 'async', it
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* is referencing this priority hint.
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*
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* With that in mind, the available types are:
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*
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* READ A normal read operation. Device will be plugged.
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* READ_SYNC A synchronous read. Device is not plugged, caller can
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* immediately wait on this read without caring about
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* unplugging.
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* READA Used for read-ahead operations. Lower priority, and the
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* block layer could (in theory) choose to ignore this
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* request if it runs into resource problems.
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* WRITE A normal async write. Device will be plugged.
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* SWRITE Like WRITE, but a special case for ll_rw_block() that
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* tells it to lock the buffer first. Normally a buffer
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* must be locked before doing IO.
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* WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down
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* the hint that someone will be waiting on this IO
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* shortly. The device must still be unplugged explicitly,
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* WRITE_SYNC_PLUG does not do this as we could be
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* submitting more writes before we actually wait on any
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* of them.
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* WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device
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* immediately after submission. The write equivalent
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* of READ_SYNC.
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* WRITE_ODIRECT_PLUG Special case write for O_DIRECT only.
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* SWRITE_SYNC
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* SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
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* See SWRITE.
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* WRITE_BARRIER Like WRITE, but tells the block layer that all
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* previously submitted writes must be safely on storage
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* before this one is started. Also guarantees that when
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* this write is complete, it itself is also safely on
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* storage. Prevents reordering of writes on both sides
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* of this IO.
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*
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*/
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#define RW_MASK 1
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#define RWA_MASK 2
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#define READ 0
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#define WRITE 1
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#define READA 2 /* read-ahead - don't block if no resources */
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#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
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#define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
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#define READ_META (READ | (1 << BIO_RW_META))
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#define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
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#define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
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#define WRITE_ODIRECT_PLUG (WRITE | (1 << BIO_RW_SYNCIO))
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#define WRITE_META (WRITE | (1 << BIO_RW_META))
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#define SWRITE_SYNC_PLUG \
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(SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
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#define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
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#define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
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/*
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* These aren't really reads or writes, they pass down information about
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* parts of device that are now unused by the file system.
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*/
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#define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD))
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#define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER))
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#define SEL_IN 1
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#define SEL_OUT 2
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#define SEL_EX 4
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/* public flags for file_system_type */
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#define FS_REQUIRES_DEV 1
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#define FS_BINARY_MOUNTDATA 2
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#define FS_HAS_SUBTYPE 4
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#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
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#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
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* during rename() internally.
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*/
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/*
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* These are the fs-independent mount-flags: up to 32 flags are supported
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*/
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#define MS_RDONLY 1 /* Mount read-only */
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#define MS_NOSUID 2 /* Ignore suid and sgid bits */
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#define MS_NODEV 4 /* Disallow access to device special files */
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#define MS_NOEXEC 8 /* Disallow program execution */
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#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
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#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
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#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
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#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
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#define MS_NOATIME 1024 /* Do not update access times. */
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#define MS_NODIRATIME 2048 /* Do not update directory access times */
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#define MS_BIND 4096
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#define MS_MOVE 8192
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#define MS_REC 16384
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#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
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MS_VERBOSE is deprecated. */
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#define MS_SILENT 32768
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#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
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#define MS_UNBINDABLE (1<<17) /* change to unbindable */
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#define MS_PRIVATE (1<<18) /* change to private */
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#define MS_SLAVE (1<<19) /* change to slave */
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#define MS_SHARED (1<<20) /* change to shared */
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#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
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#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
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#define MS_I_VERSION (1<<23) /* Update inode I_version field */
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#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
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#define MS_ACTIVE (1<<30)
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#define MS_NOUSER (1<<31)
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/*
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* Superblock flags that can be altered by MS_REMOUNT
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*/
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#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
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/*
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* Old magic mount flag and mask
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*/
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#define MS_MGC_VAL 0xC0ED0000
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#define MS_MGC_MSK 0xffff0000
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/* Inode flags - they have nothing to superblock flags now */
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#define S_SYNC 1 /* Writes are synced at once */
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#define S_NOATIME 2 /* Do not update access times */
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#define S_APPEND 4 /* Append-only file */
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#define S_IMMUTABLE 8 /* Immutable file */
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#define S_DEAD 16 /* removed, but still open directory */
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#define S_NOQUOTA 32 /* Inode is not counted to quota */
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#define S_DIRSYNC 64 /* Directory modifications are synchronous */
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#define S_NOCMTIME 128 /* Do not update file c/mtime */
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#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
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#define S_PRIVATE 512 /* Inode is fs-internal */
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/*
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* Note that nosuid etc flags are inode-specific: setting some file-system
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* flags just means all the inodes inherit those flags by default. It might be
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* possible to override it selectively if you really wanted to with some
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* ioctl() that is not currently implemented.
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*
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* Exception: MS_RDONLY is always applied to the entire file system.
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*
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* Unfortunately, it is possible to change a filesystems flags with it mounted
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* with files in use. This means that all of the inodes will not have their
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* i_flags updated. Hence, i_flags no longer inherit the superblock mount
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* flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
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*/
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#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
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#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
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#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
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((inode)->i_flags & S_SYNC))
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#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
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((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
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#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
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#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
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#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
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#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
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#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
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#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
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#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
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#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
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#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
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#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
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#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
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/* the read-only stuff doesn't really belong here, but any other place is
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probably as bad and I don't want to create yet another include file. */
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#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
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#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
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#define BLKRRPART _IO(0x12,95) /* re-read partition table */
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#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
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#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
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#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
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#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
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#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
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#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
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#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
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#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
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#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
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#if 0
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#define BLKPG _IO(0x12,105)/* See blkpg.h */
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/* Some people are morons. Do not use sizeof! */
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#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
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#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
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/* This was here just to show that the number is taken -
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probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
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#endif
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/* A jump here: 108-111 have been used for various private purposes. */
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#define BLKBSZGET _IOR(0x12,112,size_t)
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#define BLKBSZSET _IOW(0x12,113,size_t)
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#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
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#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
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#define BLKTRACESTART _IO(0x12,116)
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#define BLKTRACESTOP _IO(0x12,117)
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#define BLKTRACETEARDOWN _IO(0x12,118)
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#define BLKDISCARD _IO(0x12,119)
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#define BLKIOMIN _IO(0x12,120)
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#define BLKIOOPT _IO(0x12,121)
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#define BLKALIGNOFF _IO(0x12,122)
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#define BLKPBSZGET _IO(0x12,123)
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#define BLKDISCARDZEROES _IO(0x12,124)
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#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
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#define FIBMAP _IO(0x00,1) /* bmap access */
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#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
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#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
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#define FITHAW _IOWR('X', 120, int) /* Thaw */
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#define FS_IOC_GETFLAGS _IOR('f', 1, long)
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#define FS_IOC_SETFLAGS _IOW('f', 2, long)
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#define FS_IOC_GETVERSION _IOR('v', 1, long)
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#define FS_IOC_SETVERSION _IOW('v', 2, long)
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#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
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#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
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#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
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#define FS_IOC32_GETVERSION _IOR('v', 1, int)
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#define FS_IOC32_SETVERSION _IOW('v', 2, int)
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/*
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* Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
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*/
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#define FS_SECRM_FL 0x00000001 /* Secure deletion */
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#define FS_UNRM_FL 0x00000002 /* Undelete */
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#define FS_COMPR_FL 0x00000004 /* Compress file */
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#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
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#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
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#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
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#define FS_NODUMP_FL 0x00000040 /* do not dump file */
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#define FS_NOATIME_FL 0x00000080 /* do not update atime */
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/* Reserved for compression usage... */
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#define FS_DIRTY_FL 0x00000100
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#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
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#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
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#define FS_ECOMPR_FL 0x00000800 /* Compression error */
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/* End compression flags --- maybe not all used */
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#define FS_BTREE_FL 0x00001000 /* btree format dir */
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#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
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#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
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#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
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#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
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#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
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#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
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#define FS_EXTENT_FL 0x00080000 /* Extents */
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#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
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#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
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#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
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#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
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#define SYNC_FILE_RANGE_WAIT_BEFORE 1
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#define SYNC_FILE_RANGE_WRITE 2
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#define SYNC_FILE_RANGE_WAIT_AFTER 4
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#ifdef __KERNEL__
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#include <linux/linkage.h>
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#include <linux/wait.h>
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/dcache.h>
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#include <linux/path.h>
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#include <linux/stat.h>
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#include <linux/cache.h>
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#include <linux/kobject.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <linux/prio_tree.h>
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#include <linux/init.h>
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#include <linux/pid.h>
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#include <linux/mutex.h>
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#include <linux/capability.h>
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#include <linux/semaphore.h>
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#include <linux/fiemap.h>
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#include <asm/atomic.h>
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#include <asm/byteorder.h>
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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 nameidata;
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struct kiocb;
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struct pipe_inode_info;
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struct poll_table_struct;
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struct kstatfs;
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struct vm_area_struct;
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struct vfsmount;
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struct cred;
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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(unsigned long);
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extern struct files_stat_struct files_stat;
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extern int get_max_files(void);
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extern int sysctl_nr_open;
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extern struct inodes_stat_t inodes_stat;
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extern int leases_enable, lease_break_time;
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#ifdef CONFIG_DNOTIFY
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extern int dir_notify_enable;
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#endif
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struct buffer_head;
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typedef int (get_block_t)(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create);
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typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
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ssize_t bytes, void *private, int ret,
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bool is_async);
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/*
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* Attribute flags. These should be or-ed together to figure out what
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* has been changed!
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*/
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#define ATTR_MODE (1 << 0)
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#define ATTR_UID (1 << 1)
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#define ATTR_GID (1 << 2)
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#define ATTR_SIZE (1 << 3)
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#define ATTR_ATIME (1 << 4)
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#define ATTR_MTIME (1 << 5)
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#define ATTR_CTIME (1 << 6)
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#define ATTR_ATIME_SET (1 << 7)
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#define ATTR_MTIME_SET (1 << 8)
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#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
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#define ATTR_ATTR_FLAG (1 << 10)
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#define ATTR_KILL_SUID (1 << 11)
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#define ATTR_KILL_SGID (1 << 12)
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#define ATTR_FILE (1 << 13)
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#define ATTR_KILL_PRIV (1 << 14)
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#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
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#define ATTR_TIMES_SET (1 << 16)
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/*
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* This is the Inode Attributes structure, used for notify_change(). It
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* uses the above definitions as flags, to know which values have changed.
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* Also, in this manner, a Filesystem can look at only the values it cares
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* about. Basically, these are the attributes that the VFS layer can
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* request to change from the FS layer.
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*
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* Derek Atkins <warlord@MIT.EDU> 94-10-20
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*/
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struct iattr {
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unsigned int ia_valid;
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umode_t ia_mode;
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uid_t ia_uid;
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gid_t ia_gid;
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loff_t ia_size;
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struct timespec ia_atime;
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struct timespec ia_mtime;
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struct timespec ia_ctime;
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/*
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* Not an attribute, but an auxilary info for filesystems wanting to
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* implement an ftruncate() like method. NOTE: filesystem should
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* check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
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*/
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struct file *ia_file;
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};
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/*
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* Includes for diskquotas.
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*/
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#include <linux/quota.h>
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/**
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* enum positive_aop_returns - aop return codes with specific semantics
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*
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* @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
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* completed, that the page is still locked, and
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* should be considered active. The VM uses this hint
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* to return the page to the active list -- it won't
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* be a candidate for writeback again in the near
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* future. Other callers must be careful to unlock
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* the page if they get this return. Returned by
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* writepage();
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*
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* @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
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* unlocked it and the page might have been truncated.
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* The caller should back up to acquiring a new page and
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* trying again. The aop will be taking reasonable
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* precautions not to livelock. If the caller held a page
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* reference, it should drop it before retrying. Returned
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* by readpage().
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*
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* address_space_operation functions return these large constants to indicate
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* special semantics to the caller. These are much larger than the bytes in a
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* page to allow for functions that return the number of bytes operated on in a
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* given page.
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*/
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enum positive_aop_returns {
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AOP_WRITEPAGE_ACTIVATE = 0x80000,
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AOP_TRUNCATED_PAGE = 0x80001,
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};
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#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
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#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
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#define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
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* helper code (eg buffer layer)
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* to clear GFP_FS from alloc */
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/*
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* oh the beauties of C type declarations.
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*/
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struct page;
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struct address_space;
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struct writeback_control;
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struct iov_iter {
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const struct iovec *iov;
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unsigned long nr_segs;
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size_t iov_offset;
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size_t count;
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};
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size_t iov_iter_copy_from_user_atomic(struct page *page,
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struct iov_iter *i, unsigned long offset, size_t bytes);
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size_t iov_iter_copy_from_user(struct page *page,
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struct iov_iter *i, unsigned long offset, size_t bytes);
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void iov_iter_advance(struct iov_iter *i, size_t bytes);
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int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
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size_t iov_iter_single_seg_count(struct iov_iter *i);
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static inline void iov_iter_init(struct iov_iter *i,
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const struct iovec *iov, unsigned long nr_segs,
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size_t count, size_t written)
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{
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i->iov = iov;
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i->nr_segs = nr_segs;
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i->iov_offset = 0;
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i->count = count + written;
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iov_iter_advance(i, written);
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}
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static inline size_t iov_iter_count(struct iov_iter *i)
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{
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return i->count;
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}
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/*
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* "descriptor" for what we're up to with a read.
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* This allows us to use the same read code yet
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* have multiple different users of the data that
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* we read from a file.
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*
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* The simplest case just copies the data to user
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* mode.
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*/
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typedef struct {
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size_t written;
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size_t count;
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union {
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char __user *buf;
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void *data;
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} arg;
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int error;
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} read_descriptor_t;
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typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
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unsigned long, unsigned long);
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struct address_space_operations {
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int (*writepage)(struct page *page, struct writeback_control *wbc);
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int (*readpage)(struct file *, struct page *);
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void (*sync_page)(struct page *);
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/* Write back some dirty pages from this mapping. */
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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);
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int (*readpages)(struct file *filp, struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages);
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int (*write_begin)(struct file *, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata);
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int (*write_end)(struct file *, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata);
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/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
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sector_t (*bmap)(struct address_space *, sector_t);
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void (*invalidatepage) (struct page *, unsigned long);
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int (*releasepage) (struct page *, gfp_t);
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ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
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loff_t offset, unsigned long nr_segs);
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int (*get_xip_mem)(struct address_space *, pgoff_t, int,
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void **, unsigned long *);
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/* migrate the contents of a page to the specified target */
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int (*migratepage) (struct address_space *,
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struct page *, struct page *);
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int (*launder_page) (struct page *);
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int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
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unsigned long);
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int (*error_remove_page)(struct address_space *, struct page *);
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};
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/*
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* pagecache_write_begin/pagecache_write_end must be used by general code
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* to write into the pagecache.
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*/
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int pagecache_write_begin(struct file *, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata);
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int pagecache_write_end(struct file *, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata);
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struct backing_dev_info;
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struct address_space {
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struct inode *host; /* owner: inode, block_device */
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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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unsigned int i_mmap_writable;/* count VM_SHARED mappings */
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struct prio_tree_root i_mmap; /* tree of private and shared mappings */
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struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
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spinlock_t i_mmap_lock; /* protect tree, count, list */
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unsigned int truncate_count; /* Cover race condition with truncate */
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unsigned long nrpages; /* number of total pages */
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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/gfp mask */
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struct backing_dev_info *backing_dev_info; /* device readahead, etc */
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spinlock_t private_lock; /* for use by the address_space */
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struct list_head private_list; /* ditto */
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struct address_space *assoc_mapping; /* ditto */
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} __attribute__((aligned(sizeof(long))));
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/*
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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 signficant bit
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* of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
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*/
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struct block_device {
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dev_t bd_dev; /* not a kdev_t - it's a search key */
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struct inode * bd_inode; /* will die */
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struct super_block * bd_super;
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int bd_openers;
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struct mutex bd_mutex; /* open/close mutex */
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struct list_head bd_inodes;
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void * bd_claiming;
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void * bd_holder;
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int bd_holders;
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#ifdef CONFIG_SYSFS
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struct list_head bd_holder_list;
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#endif
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struct block_device * bd_contains;
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unsigned bd_block_size;
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struct hd_struct * bd_part;
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/* number of times partitions within this device have been opened. */
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unsigned bd_part_count;
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int bd_invalidated;
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struct gendisk * bd_disk;
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struct list_head bd_list;
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/*
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* Private data. You must have bd_claim'ed the block_device
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* to use this. NOTE: bd_claim allows an owner to claim
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* the same device multiple times, the owner must take special
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* care to not mess up bd_private for that case.
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*/
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unsigned long bd_private;
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/* The counter of freeze processes */
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int bd_fsfreeze_count;
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/* Mutex for freeze */
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struct mutex bd_fsfreeze_mutex;
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};
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/*
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* Radix-tree tags, for tagging dirty and writeback pages within the pagecache
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* radix trees
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*/
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#define PAGECACHE_TAG_DIRTY 0
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#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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/*
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* Might pages of this file be mapped into userspace?
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*/
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static inline int mapping_mapped(struct address_space *mapping)
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{
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return !prio_tree_empty(&mapping->i_mmap) ||
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!list_empty(&mapping->i_mmap_nonlinear);
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}
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/*
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* Might pages of this file have been modified in userspace?
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* Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
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* marks vma as VM_SHARED if it is shared, and the file was opened for
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* writing i.e. vma may be mprotected writable even if now readonly.
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*/
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static inline int mapping_writably_mapped(struct address_space *mapping)
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{
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return mapping->i_mmap_writable != 0;
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}
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/*
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* Use sequence counter to get consistent i_size on 32-bit processors.
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*/
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#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
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#include <linux/seqlock.h>
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#define __NEED_I_SIZE_ORDERED
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#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
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#else
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#define i_size_ordered_init(inode) do { } while (0)
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#endif
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struct posix_acl;
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#define ACL_NOT_CACHED ((void *)(-1))
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struct inode {
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struct hlist_node i_hash;
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struct list_head i_list; /* backing dev IO list */
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struct list_head i_sb_list;
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struct list_head i_dentry;
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unsigned long i_ino;
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atomic_t i_count;
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unsigned int i_nlink;
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uid_t i_uid;
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gid_t i_gid;
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dev_t i_rdev;
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unsigned int i_blkbits;
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u64 i_version;
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loff_t i_size;
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#ifdef __NEED_I_SIZE_ORDERED
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seqcount_t i_size_seqcount;
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#endif
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struct timespec i_atime;
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struct timespec i_mtime;
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struct timespec i_ctime;
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blkcnt_t i_blocks;
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unsigned short i_bytes;
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umode_t i_mode;
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spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
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struct mutex i_mutex;
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struct rw_semaphore i_alloc_sem;
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const struct inode_operations *i_op;
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const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
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struct super_block *i_sb;
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struct file_lock *i_flock;
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struct address_space *i_mapping;
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struct address_space i_data;
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#ifdef CONFIG_QUOTA
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struct dquot *i_dquot[MAXQUOTAS];
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#endif
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struct list_head i_devices;
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union {
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struct pipe_inode_info *i_pipe;
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struct block_device *i_bdev;
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struct cdev *i_cdev;
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};
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__u32 i_generation;
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#ifdef CONFIG_FSNOTIFY
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__u32 i_fsnotify_mask; /* all events this inode cares about */
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struct hlist_head i_fsnotify_mark_entries; /* fsnotify mark entries */
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#endif
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#ifdef CONFIG_INOTIFY
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struct list_head inotify_watches; /* watches on this inode */
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struct mutex inotify_mutex; /* protects the watches list */
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#endif
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|
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unsigned long i_state;
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unsigned long dirtied_when; /* jiffies of first dirtying */
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|
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unsigned int i_flags;
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|
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atomic_t i_writecount;
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#ifdef CONFIG_SECURITY
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void *i_security;
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#endif
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#ifdef CONFIG_FS_POSIX_ACL
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struct posix_acl *i_acl;
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struct posix_acl *i_default_acl;
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#endif
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void *i_private; /* fs or device private pointer */
|
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};
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|
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/*
|
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* inode->i_mutex nesting subclasses for the lock validator:
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*
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* 0: the object of the current VFS operation
|
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* 1: parent
|
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* 2: child/target
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* 3: quota file
|
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*
|
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* The locking order between these classes is
|
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* parent -> child -> normal -> xattr -> quota
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*/
|
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enum inode_i_mutex_lock_class
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{
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I_MUTEX_NORMAL,
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I_MUTEX_PARENT,
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I_MUTEX_CHILD,
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I_MUTEX_XATTR,
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I_MUTEX_QUOTA
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};
|
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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),
|
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* but they don't need to be atomic with respect to other cpus like in
|
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* 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
|
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* cmpxchg8b without the need of the lock prefix). For SMP compiles
|
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* and 64bit archs it makes no difference if preempt is enabled or not.
|
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*/
|
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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)
|
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loff_t i_size;
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unsigned int seq;
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do {
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seq = read_seqcount_begin(&inode->i_size_seqcount);
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i_size = inode->i_size;
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} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
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return i_size;
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#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
|
|
loff_t i_size;
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|
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preempt_disable();
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i_size = inode->i_size;
|
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preempt_enable();
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return i_size;
|
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#else
|
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return inode->i_size;
|
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#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 */
|
|
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;
|
|
#endif /* #ifdef CONFIG_EPOLL */
|
|
struct address_space *f_mapping;
|
|
#ifdef CONFIG_DEBUG_WRITECOUNT
|
|
unsigned long f_mnt_write_state;
|
|
#endif
|
|
};
|
|
extern spinlock_t files_lock;
|
|
#define file_list_lock() spin_lock(&files_lock);
|
|
#define file_list_unlock() spin_unlock(&files_lock);
|
|
|
|
#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_copy_lock)(struct file_lock *, struct file_lock *);
|
|
void (*fl_release_private)(struct file_lock *);
|
|
void (*fl_break)(struct file_lock *);
|
|
int (*fl_mylease)(struct file_lock *, 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 */
|
|
extern void locks_init_lock(struct file_lock *);
|
|
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);
|
|
#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;
|
|
}
|
|
|
|
#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 **);
|
|
/* 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_head s_anon; /* anonymous dentries for (nfs) exporting */
|
|
struct list_head s_files;
|
|
/* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
|
|
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 */
|
|
|
|
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 *s_options;
|
|
};
|
|
|
|
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(¤t->fs_excl)
|
|
#define put_fs_excl() atomic_dec(¤t->fs_excl)
|
|
#define has_fs_excl() atomic_read(¤t->fs_excl)
|
|
|
|
#define is_owner_or_cap(inode) \
|
|
((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
|
|
|
|
/* 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 *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:
|
|
* read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
|
|
* 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 *);
|
|
int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
|
|
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 **);
|
|
};
|
|
|
|
struct inode_operations {
|
|
int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
|
|
struct dentry * (*lookup) (struct inode *,struct dentry *, 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 *);
|
|
int (*readlink) (struct dentry *, char __user *,int);
|
|
void * (*follow_link) (struct dentry *, struct nameidata *);
|
|
void (*put_link) (struct dentry *, struct nameidata *, void *);
|
|
void (*truncate) (struct inode *);
|
|
int (*permission) (struct inode *, int);
|
|
int (*check_acl)(struct inode *, int);
|
|
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);
|
|
long (*fallocate)(struct inode *inode, int mode, loff_t offset,
|
|
loff_t len);
|
|
int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
|
|
u64 len);
|
|
};
|
|
|
|
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 (*write_inode) (struct inode *, struct writeback_control *wbc);
|
|
void (*drop_inode) (struct inode *);
|
|
void (*delete_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 (*clear_inode) (struct inode *);
|
|
void (*umount_begin) (struct super_block *);
|
|
|
|
int (*show_options)(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_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 Set by clear_inode(). In this state the inode is clean
|
|
* and can be destroyed.
|
|
*
|
|
* 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
|
|
#define I_DIRTY_DATASYNC 2
|
|
#define I_DIRTY_PAGES 4
|
|
#define __I_NEW 3
|
|
#define I_NEW (1 << __I_NEW)
|
|
#define I_WILL_FREE 16
|
|
#define I_FREEING 32
|
|
#define I_CLEAR 64
|
|
#define __I_SYNC 7
|
|
#define I_SYNC (1 << __I_SYNC)
|
|
|
|
#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);
|
|
|
|
struct file_system_type {
|
|
const char *name;
|
|
int fs_flags;
|
|
int (*get_sb) (struct file_system_type *, int,
|
|
const char *, void *, struct vfsmount *);
|
|
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 int get_sb_ns(struct file_system_type *fs_type, int flags, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
struct vfsmount *mnt);
|
|
extern int get_sb_bdev(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
struct vfsmount *mnt);
|
|
extern int get_sb_single(struct file_system_type *fs_type,
|
|
int flags, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
struct vfsmount *mnt);
|
|
extern int get_sb_nodev(struct file_system_type *fs_type,
|
|
int flags, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
struct vfsmount *mnt);
|
|
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 int get_sb_pseudo(struct file_system_type *, char *,
|
|
const struct super_operations *ops, unsigned long,
|
|
struct vfsmount *mnt);
|
|
extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
|
|
|
|
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 dentry *, struct kstatfs *);
|
|
extern int freeze_super(struct super_block *super);
|
|
extern int thaw_super(struct super_block *super);
|
|
|
|
extern int current_umask(void);
|
|
|
|
/* /sys/fs */
|
|
extern struct kobject *fs_kobj;
|
|
|
|
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 * 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 void bd_forget(struct inode *inode);
|
|
extern void bdput(struct block_device *);
|
|
extern struct block_device *open_by_devnum(dev_t, fmode_t);
|
|
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 *, fmode_t);
|
|
extern int blkdev_put(struct block_device *, fmode_t);
|
|
extern int bd_claim(struct block_device *, void *);
|
|
extern void bd_release(struct block_device *);
|
|
#ifdef CONFIG_SYSFS
|
|
extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
|
|
extern void bd_release_from_disk(struct block_device *, struct gendisk *);
|
|
#else
|
|
#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
|
|
#define bd_release_from_disk(bdev, disk) bd_release(bdev)
|
|
#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 struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
|
|
extern void close_bdev_exclusive(struct block_device *, fmode_t);
|
|
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 *);
|
|
extern int invalidate_partition(struct gendisk *, int);
|
|
#endif
|
|
extern int invalidate_inodes(struct super_block *);
|
|
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,
|
|
int (*check_acl)(struct inode *, 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);
|
|
}
|
|
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 struct file *do_filp_open(int dfd, const char *pathname,
|
|
int open_flag, int mode, int acc_mode);
|
|
extern int may_open(struct path *, int, int);
|
|
|
|
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 inode_add_to_lists(struct super_block *, struct 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 void generic_delete_inode(struct inode *inode);
|
|
extern void generic_drop_inode(struct inode *inode);
|
|
extern int generic_detach_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 void __iget(struct inode * inode);
|
|
extern void iget_failed(struct inode *);
|
|
extern void clear_inode(struct inode *);
|
|
extern void destroy_inode(struct inode *);
|
|
extern void __destroy_inode(struct inode *);
|
|
extern struct inode *new_inode(struct super_block *);
|
|
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 file_move(struct file *f, struct list_head *list);
|
|
extern void file_kill(struct file *f);
|
|
#ifdef CONFIG_BLOCK
|
|
struct bio;
|
|
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
|
|
struct bio;
|
|
typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
|
|
loff_t file_offset);
|
|
void dio_end_io(struct bio *bio, int error);
|
|
|
|
ssize_t __blockdev_direct_IO_newtrunc(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 lock_type);
|
|
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 lock_type);
|
|
|
|
enum {
|
|
/* need locking between buffered and direct access */
|
|
DIO_LOCKING = 0x01,
|
|
|
|
/* filesystem does not support filling holes */
|
|
DIO_SKIP_HOLES = 0x02,
|
|
};
|
|
|
|
static inline ssize_t blockdev_direct_IO_newtrunc(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_newtrunc(rw, iocb, inode, bdev, iov, offset,
|
|
nr_segs, get_block, end_io, NULL,
|
|
DIO_LOCKING | DIO_SKIP_HOLES);
|
|
}
|
|
|
|
static inline ssize_t blockdev_direct_IO_no_locking_newtrunc(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_newtrunc(rw, iocb, inode, bdev, iov, offset,
|
|
nr_segs, get_block, end_io, NULL, 0);
|
|
}
|
|
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);
|
|
}
|
|
|
|
static inline ssize_t blockdev_direct_IO_no_locking(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, 0);
|
|
}
|
|
#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(char __user *, struct kstat *);
|
|
extern int vfs_lstat(char __user *, struct kstat *);
|
|
extern int vfs_fstat(unsigned int, struct kstat *);
|
|
extern int vfs_fstatat(int , 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 simple_setsize(struct inode *, loff_t);
|
|
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);
|
|
|
|
#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 int __must_check inode_setattr(struct inode *, const struct iattr *);
|
|
extern void generic_setattr(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;
|
|
|
|
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, \
|
|
};
|
|
|
|
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 __init get_filesystem_list(char *buf);
|
|
|
|
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
|
|
#define OPEN_FMODE(flag) ((__force fmode_t)((flag + 1) & O_ACCMODE))
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_FS_H */
|