mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Brian Foster](/assets/img/avatar_default.png)
XFS traditionally sends all buffer I/O completion work to a single workqueue. This includes metadata buffer completion and log buffer completion. The log buffer completion requires a high priority queue to prevent stalls due to log forces getting stuck behind other queued work. Rather than continue to prioritize all buffer I/O completion due to the needs of log completion, split log buffer completion off to m_log_workqueue and move the high priority flag from m_buf_workqueue to m_log_workqueue. Add a b_ioend_wq wq pointer to xfs_buf to allow completion workqueue customization on a per-buffer basis. Initialize b_ioend_wq to m_buf_workqueue by default in the generic buffer I/O submission path. Finally, override the default wq with the high priority m_log_workqueue in the log buffer I/O submission path. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
393 lines
13 KiB
C
393 lines
13 KiB
C
/*
|
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef __XFS_BUF_H__
|
|
#define __XFS_BUF_H__
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/types.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/uio.h>
|
|
#include <linux/list_lru.h>
|
|
|
|
/*
|
|
* Base types
|
|
*/
|
|
|
|
#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
|
|
|
|
typedef enum {
|
|
XBRW_READ = 1, /* transfer into target memory */
|
|
XBRW_WRITE = 2, /* transfer from target memory */
|
|
XBRW_ZERO = 3, /* Zero target memory */
|
|
} xfs_buf_rw_t;
|
|
|
|
#define XBF_READ (1 << 0) /* buffer intended for reading from device */
|
|
#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
|
|
#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */
|
|
#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
|
|
#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
|
|
#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */
|
|
#define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */
|
|
|
|
/* I/O hints for the BIO layer */
|
|
#define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */
|
|
#define XBF_FUA (1 << 11)/* force cache write through mode */
|
|
#define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */
|
|
|
|
/* flags used only as arguments to access routines */
|
|
#define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */
|
|
#define XBF_UNMAPPED (1 << 17)/* do not map the buffer */
|
|
|
|
/* flags used only internally */
|
|
#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */
|
|
#define _XBF_KMEM (1 << 21)/* backed by heap memory */
|
|
#define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */
|
|
#define _XBF_COMPOUND (1 << 23)/* compound buffer */
|
|
|
|
typedef unsigned int xfs_buf_flags_t;
|
|
|
|
#define XFS_BUF_FLAGS \
|
|
{ XBF_READ, "READ" }, \
|
|
{ XBF_WRITE, "WRITE" }, \
|
|
{ XBF_READ_AHEAD, "READ_AHEAD" }, \
|
|
{ XBF_ASYNC, "ASYNC" }, \
|
|
{ XBF_DONE, "DONE" }, \
|
|
{ XBF_STALE, "STALE" }, \
|
|
{ XBF_WRITE_FAIL, "WRITE_FAIL" }, \
|
|
{ XBF_SYNCIO, "SYNCIO" }, \
|
|
{ XBF_FUA, "FUA" }, \
|
|
{ XBF_FLUSH, "FLUSH" }, \
|
|
{ XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\
|
|
{ XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\
|
|
{ _XBF_PAGES, "PAGES" }, \
|
|
{ _XBF_KMEM, "KMEM" }, \
|
|
{ _XBF_DELWRI_Q, "DELWRI_Q" }, \
|
|
{ _XBF_COMPOUND, "COMPOUND" }
|
|
|
|
|
|
/*
|
|
* Internal state flags.
|
|
*/
|
|
#define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */
|
|
|
|
/*
|
|
* The xfs_buftarg contains 2 notions of "sector size" -
|
|
*
|
|
* 1) The metadata sector size, which is the minimum unit and
|
|
* alignment of IO which will be performed by metadata operations.
|
|
* 2) The device logical sector size
|
|
*
|
|
* The first is specified at mkfs time, and is stored on-disk in the
|
|
* superblock's sb_sectsize.
|
|
*
|
|
* The latter is derived from the underlying device, and controls direct IO
|
|
* alignment constraints.
|
|
*/
|
|
typedef struct xfs_buftarg {
|
|
dev_t bt_dev;
|
|
struct block_device *bt_bdev;
|
|
struct backing_dev_info *bt_bdi;
|
|
struct xfs_mount *bt_mount;
|
|
unsigned int bt_meta_sectorsize;
|
|
size_t bt_meta_sectormask;
|
|
size_t bt_logical_sectorsize;
|
|
size_t bt_logical_sectormask;
|
|
|
|
/* LRU control structures */
|
|
struct shrinker bt_shrinker;
|
|
struct list_lru bt_lru;
|
|
} xfs_buftarg_t;
|
|
|
|
struct xfs_buf;
|
|
typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
|
|
|
|
|
|
#define XB_PAGES 2
|
|
|
|
struct xfs_buf_map {
|
|
xfs_daddr_t bm_bn; /* block number for I/O */
|
|
int bm_len; /* size of I/O */
|
|
};
|
|
|
|
#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
|
|
struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
|
|
|
|
struct xfs_buf_ops {
|
|
void (*verify_read)(struct xfs_buf *);
|
|
void (*verify_write)(struct xfs_buf *);
|
|
};
|
|
|
|
typedef struct xfs_buf {
|
|
/*
|
|
* first cacheline holds all the fields needed for an uncontended cache
|
|
* hit to be fully processed. The semaphore straddles the cacheline
|
|
* boundary, but the counter and lock sits on the first cacheline,
|
|
* which is the only bit that is touched if we hit the semaphore
|
|
* fast-path on locking.
|
|
*/
|
|
struct rb_node b_rbnode; /* rbtree node */
|
|
xfs_daddr_t b_bn; /* block number of buffer */
|
|
int b_length; /* size of buffer in BBs */
|
|
atomic_t b_hold; /* reference count */
|
|
atomic_t b_lru_ref; /* lru reclaim ref count */
|
|
xfs_buf_flags_t b_flags; /* status flags */
|
|
struct semaphore b_sema; /* semaphore for lockables */
|
|
|
|
/*
|
|
* concurrent access to b_lru and b_lru_flags are protected by
|
|
* bt_lru_lock and not by b_sema
|
|
*/
|
|
struct list_head b_lru; /* lru list */
|
|
spinlock_t b_lock; /* internal state lock */
|
|
unsigned int b_state; /* internal state flags */
|
|
int b_io_error; /* internal IO error state */
|
|
wait_queue_head_t b_waiters; /* unpin waiters */
|
|
struct list_head b_list;
|
|
struct xfs_perag *b_pag; /* contains rbtree root */
|
|
xfs_buftarg_t *b_target; /* buffer target (device) */
|
|
void *b_addr; /* virtual address of buffer */
|
|
struct work_struct b_ioend_work;
|
|
struct workqueue_struct *b_ioend_wq; /* I/O completion wq */
|
|
xfs_buf_iodone_t b_iodone; /* I/O completion function */
|
|
struct completion b_iowait; /* queue for I/O waiters */
|
|
void *b_fspriv;
|
|
struct xfs_trans *b_transp;
|
|
struct page **b_pages; /* array of page pointers */
|
|
struct page *b_page_array[XB_PAGES]; /* inline pages */
|
|
struct xfs_buf_map *b_maps; /* compound buffer map */
|
|
struct xfs_buf_map __b_map; /* inline compound buffer map */
|
|
int b_map_count;
|
|
int b_io_length; /* IO size in BBs */
|
|
atomic_t b_pin_count; /* pin count */
|
|
atomic_t b_io_remaining; /* #outstanding I/O requests */
|
|
unsigned int b_page_count; /* size of page array */
|
|
unsigned int b_offset; /* page offset in first page */
|
|
int b_error; /* error code on I/O */
|
|
const struct xfs_buf_ops *b_ops;
|
|
|
|
#ifdef XFS_BUF_LOCK_TRACKING
|
|
int b_last_holder;
|
|
#endif
|
|
} xfs_buf_t;
|
|
|
|
/* Finding and Reading Buffers */
|
|
struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target,
|
|
struct xfs_buf_map *map, int nmaps,
|
|
xfs_buf_flags_t flags, struct xfs_buf *new_bp);
|
|
|
|
static inline struct xfs_buf *
|
|
xfs_incore(
|
|
struct xfs_buftarg *target,
|
|
xfs_daddr_t blkno,
|
|
size_t numblks,
|
|
xfs_buf_flags_t flags)
|
|
{
|
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
|
|
return _xfs_buf_find(target, &map, 1, flags, NULL);
|
|
}
|
|
|
|
struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
|
|
struct xfs_buf_map *map, int nmaps,
|
|
xfs_buf_flags_t flags);
|
|
|
|
static inline struct xfs_buf *
|
|
xfs_buf_alloc(
|
|
struct xfs_buftarg *target,
|
|
xfs_daddr_t blkno,
|
|
size_t numblks,
|
|
xfs_buf_flags_t flags)
|
|
{
|
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
|
|
return _xfs_buf_alloc(target, &map, 1, flags);
|
|
}
|
|
|
|
struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
|
|
struct xfs_buf_map *map, int nmaps,
|
|
xfs_buf_flags_t flags);
|
|
struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
|
|
struct xfs_buf_map *map, int nmaps,
|
|
xfs_buf_flags_t flags,
|
|
const struct xfs_buf_ops *ops);
|
|
void xfs_buf_readahead_map(struct xfs_buftarg *target,
|
|
struct xfs_buf_map *map, int nmaps,
|
|
const struct xfs_buf_ops *ops);
|
|
|
|
static inline struct xfs_buf *
|
|
xfs_buf_get(
|
|
struct xfs_buftarg *target,
|
|
xfs_daddr_t blkno,
|
|
size_t numblks,
|
|
xfs_buf_flags_t flags)
|
|
{
|
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
|
|
return xfs_buf_get_map(target, &map, 1, flags);
|
|
}
|
|
|
|
static inline struct xfs_buf *
|
|
xfs_buf_read(
|
|
struct xfs_buftarg *target,
|
|
xfs_daddr_t blkno,
|
|
size_t numblks,
|
|
xfs_buf_flags_t flags,
|
|
const struct xfs_buf_ops *ops)
|
|
{
|
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
|
|
return xfs_buf_read_map(target, &map, 1, flags, ops);
|
|
}
|
|
|
|
static inline void
|
|
xfs_buf_readahead(
|
|
struct xfs_buftarg *target,
|
|
xfs_daddr_t blkno,
|
|
size_t numblks,
|
|
const struct xfs_buf_ops *ops)
|
|
{
|
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
|
|
return xfs_buf_readahead_map(target, &map, 1, ops);
|
|
}
|
|
|
|
struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
|
|
void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
|
|
int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);
|
|
|
|
struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
|
|
int flags);
|
|
int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
|
|
size_t numblks, int flags, struct xfs_buf **bpp,
|
|
const struct xfs_buf_ops *ops);
|
|
void xfs_buf_hold(struct xfs_buf *bp);
|
|
|
|
/* Releasing Buffers */
|
|
extern void xfs_buf_free(xfs_buf_t *);
|
|
extern void xfs_buf_rele(xfs_buf_t *);
|
|
|
|
/* Locking and Unlocking Buffers */
|
|
extern int xfs_buf_trylock(xfs_buf_t *);
|
|
extern void xfs_buf_lock(xfs_buf_t *);
|
|
extern void xfs_buf_unlock(xfs_buf_t *);
|
|
#define xfs_buf_islocked(bp) \
|
|
((bp)->b_sema.count <= 0)
|
|
|
|
/* Buffer Read and Write Routines */
|
|
extern int xfs_bwrite(struct xfs_buf *bp);
|
|
extern void xfs_buf_ioend(struct xfs_buf *bp);
|
|
extern void xfs_buf_ioerror(xfs_buf_t *, int);
|
|
extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
|
|
extern void xfs_buf_submit(struct xfs_buf *bp);
|
|
extern int xfs_buf_submit_wait(struct xfs_buf *bp);
|
|
extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
|
|
xfs_buf_rw_t);
|
|
#define xfs_buf_zero(bp, off, len) \
|
|
xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
|
|
|
|
/* Buffer Utility Routines */
|
|
extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
|
|
|
|
/* Delayed Write Buffer Routines */
|
|
extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
|
|
extern int xfs_buf_delwri_submit(struct list_head *);
|
|
extern int xfs_buf_delwri_submit_nowait(struct list_head *);
|
|
|
|
/* Buffer Daemon Setup Routines */
|
|
extern int xfs_buf_init(void);
|
|
extern void xfs_buf_terminate(void);
|
|
|
|
#define XFS_BUF_ZEROFLAGS(bp) \
|
|
((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \
|
|
XBF_SYNCIO|XBF_FUA|XBF_FLUSH| \
|
|
XBF_WRITE_FAIL))
|
|
|
|
void xfs_buf_stale(struct xfs_buf *bp);
|
|
#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
|
|
#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
|
|
|
|
#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
|
|
#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
|
|
#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
|
|
|
|
#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
|
|
#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
|
|
#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
|
|
|
|
#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
|
|
#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
|
|
#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
|
|
|
|
#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
|
|
#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
|
|
#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
|
|
|
|
/*
|
|
* These macros use the IO block map rather than b_bn. b_bn is now really
|
|
* just for the buffer cache index for cached buffers. As IO does not use b_bn
|
|
* anymore, uncached buffers do not use b_bn at all and hence must modify the IO
|
|
* map directly. Uncached buffers are not allowed to be discontiguous, so this
|
|
* is safe to do.
|
|
*
|
|
* In future, uncached buffers will pass the block number directly to the io
|
|
* request function and hence these macros will go away at that point.
|
|
*/
|
|
#define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn)
|
|
#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno))
|
|
|
|
static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref)
|
|
{
|
|
atomic_set(&bp->b_lru_ref, lru_ref);
|
|
}
|
|
|
|
static inline int xfs_buf_ispinned(struct xfs_buf *bp)
|
|
{
|
|
return atomic_read(&bp->b_pin_count);
|
|
}
|
|
|
|
static inline void xfs_buf_relse(xfs_buf_t *bp)
|
|
{
|
|
xfs_buf_unlock(bp);
|
|
xfs_buf_rele(bp);
|
|
}
|
|
|
|
static inline int
|
|
xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
|
|
{
|
|
return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
|
|
cksum_offset);
|
|
}
|
|
|
|
static inline void
|
|
xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
|
|
{
|
|
xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
|
|
cksum_offset);
|
|
}
|
|
|
|
/*
|
|
* Handling of buftargs.
|
|
*/
|
|
extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
|
|
struct block_device *);
|
|
extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
|
|
extern void xfs_wait_buftarg(xfs_buftarg_t *);
|
|
extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int);
|
|
|
|
#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
|
|
#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
|
|
|
|
#endif /* __XFS_BUF_H__ */
|