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xfs: call xfs_buf_iodone directly

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All unmarked dirty buffers should be in the AIL and have log items
attached to them. Hence when they are written, we will run a
callback to remove the item from the AIL if appropriate. Now that
we've handled inode and dquot buffers, all remaining calls are to
xfs_buf_iodone() and so we can hard code this rather than use an
indirect call.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Chinner 2020-06-29 14:48:47 -07:00 committed by Darrick J. Wong
parent 9fe5c77cbe
commit b01d1461ae
5 changed files with 28 additions and 67 deletions
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24
fs/xfs/xfs_buf.c
View File

@ -658,7 +658,6 @@ xfs_buf_find(
*/
if (bp->b_flags & XBF_STALE) {
ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
ASSERT(bp->b_iodone == NULL);
bp->b_flags &= _XBF_KMEM | _XBF_PAGES;
bp->b_ops = NULL;
}
@ -1194,10 +1193,13 @@ xfs_buf_ioend(
if (!bp->b_error && bp->b_io_error)
xfs_buf_ioerror(bp, bp->b_io_error);
/* Only validate buffers that were read without errors */
if (read && !bp->b_error && bp->b_ops) {
ASSERT(!bp->b_iodone);
bp->b_ops->verify_read(bp);
if (read) {
if (!bp->b_error && bp->b_ops)
bp->b_ops->verify_read(bp);
if (!bp->b_error)
bp->b_flags |= XBF_DONE;
xfs_buf_ioend_finish(bp);
return;
}
if (!bp->b_error) {
@ -1205,9 +1207,6 @@ xfs_buf_ioend(
bp->b_flags |= XBF_DONE;
}
if (read)
goto out_finish;
/*
* If this is a log recovery buffer, we aren't doing transactional IO
* yet so we need to let it handle IO completions.
@ -1226,14 +1225,7 @@ xfs_buf_ioend(
xfs_buf_dquot_iodone(bp);
return;
}
if (bp->b_iodone) {
(*(bp->b_iodone))(bp);
return;
}
out_finish:
xfs_buf_ioend_finish(bp);
xfs_buf_iodone(bp);
}
static void

6
fs/xfs/xfs_buf.h
View File

@ -18,6 +18,7 @@
/*
* Base types
*/
struct xfs_buf;
#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
@ -102,10 +103,6 @@ typedef struct xfs_buftarg {
struct ratelimit_state bt_ioerror_rl;
} xfs_buftarg_t;
struct xfs_buf;
typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
#define XB_PAGES 2
struct xfs_buf_map {
@ -158,7 +155,6 @@ typedef struct xfs_buf {
xfs_buftarg_t *b_target; /* buffer target (device) */
void *b_addr; /* virtual address of buffer */
struct work_struct b_ioend_work;
xfs_buf_iodone_t b_iodone; /* I/O completion function */
struct completion b_iowait; /* queue for I/O waiters */
struct xfs_buf_log_item *b_log_item;
struct list_head b_li_list; /* Log items list head */

48
fs/xfs/xfs_buf_item.c
View File

@ -460,7 +460,6 @@ xfs_buf_item_unpin(
xfs_buf_do_callbacks(bp);
bp->b_log_item = NULL;
list_del_init(&bp->b_li_list);
bp->b_iodone = NULL;
} else {
xfs_trans_ail_delete(lip, SHUTDOWN_LOG_IO_ERROR);
xfs_buf_item_relse(bp);
@ -936,11 +935,7 @@ xfs_buf_item_free(
}
/*
* This is called when the buf log item is no longer needed. It should
* free the buf log item associated with the given buffer and clear
* the buffer's pointer to the buf log item. If there are no more
* items in the list, clear the b_iodone field of the buffer (see
* xfs_buf_attach_iodone() below).
* xfs_buf_item_relse() is called when the buf log item is no longer needed.
*/
void
xfs_buf_item_relse(
@ -952,9 +947,6 @@ xfs_buf_item_relse(
ASSERT(!test_bit(XFS_LI_IN_AIL, &bip->bli_item.li_flags));
bp->b_log_item = NULL;
if (list_empty(&bp->b_li_list))
bp->b_iodone = NULL;
xfs_buf_rele(bp);
xfs_buf_item_free(bip);
}
@ -962,10 +954,7 @@ xfs_buf_item_relse(
/*
* Add the given log item with its callback to the list of callbacks
* to be called when the buffer's I/O completes. If it is not set
* already, set the buffer's b_iodone() routine to be
* xfs_buf_iodone_callbacks() and link the log item into the list of
* items rooted at b_li_list.
* to be called when the buffer's I/O completes.
*/
void
xfs_buf_attach_iodone(
@ -977,10 +966,6 @@ xfs_buf_attach_iodone(
lip->li_cb = cb;
list_add_tail(&lip->li_bio_list, &bp->b_li_list);
ASSERT(bp->b_iodone == NULL ||
bp->b_iodone == xfs_buf_iodone_callbacks);
bp->b_iodone = xfs_buf_iodone_callbacks;
}
/*
@ -1096,7 +1081,6 @@ xfs_buf_iodone_callback_error(
goto out_stale;
trace_xfs_buf_item_iodone_async(bp, _RET_IP_);
ASSERT(bp->b_iodone != NULL);
cfg = xfs_error_get_cfg(mp, XFS_ERR_METADATA, bp->b_error);
@ -1182,21 +1166,6 @@ xfs_buf_run_callbacks(
xfs_buf_do_callbacks(bp);
bp->b_log_item = NULL;
list_del_init(&bp->b_li_list);
bp->b_iodone = NULL;
}
/*
* This is the iodone() function for buffers which have had callbacks attached
* to them by xfs_buf_attach_iodone(). We need to iterate the items on the
* callback list, mark the buffer as having no more callbacks and then push the
* buffer through IO completion processing.
*/
void
xfs_buf_iodone_callbacks(
struct xfs_buf *bp)
{
xfs_buf_run_callbacks(bp);
xfs_buf_ioend(bp);
}
/*
@ -1221,6 +1190,17 @@ xfs_buf_dquot_iodone(
xfs_buf_ioend_finish(bp);
}
/*
* Dirty buffer iodone callback function.
*/
void
xfs_buf_iodone(
struct xfs_buf *bp)
{
xfs_buf_run_callbacks(bp);
xfs_buf_ioend_finish(bp);
}
/*
* This is the iodone() function for buffers which have been
* logged. It is called when they are eventually flushed out.
@ -1229,7 +1209,7 @@ xfs_buf_dquot_iodone(
* care of cleaning up the buffer itself.
*/
void
xfs_buf_iodone(
xfs_buf_item_iodone(
struct xfs_buf *bp,
struct xfs_log_item *lip)
{

4
fs/xfs/xfs_buf_item.h
View File

@ -57,10 +57,10 @@ bool xfs_buf_item_dirty_format(struct xfs_buf_log_item *);
void xfs_buf_attach_iodone(struct xfs_buf *,
void(*)(struct xfs_buf *, struct xfs_log_item *),
struct xfs_log_item *);
void xfs_buf_iodone_callbacks(struct xfs_buf *);
void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
void xfs_buf_item_iodone(struct xfs_buf *, struct xfs_log_item *);
void xfs_buf_inode_iodone(struct xfs_buf *);
void xfs_buf_dquot_iodone(struct xfs_buf *);
void xfs_buf_iodone(struct xfs_buf *);
bool xfs_buf_log_check_iovec(struct xfs_log_iovec *iovec);
extern kmem_zone_t *xfs_buf_item_zone;

13
fs/xfs/xfs_trans_buf.c
View File

@ -465,24 +465,17 @@ xfs_trans_dirty_buf(
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(bp->b_iodone == NULL ||
bp->b_iodone == xfs_buf_iodone_callbacks);
/*
* Mark the buffer as needing to be written out eventually,
* and set its iodone function to remove the buffer's buf log
* item from the AIL and free it when the buffer is flushed
* to disk. See xfs_buf_attach_iodone() for more details
* on li_cb and xfs_buf_iodone_callbacks().
* If we end up aborting this transaction, we trap this buffer
* inside the b_bdstrat callback so that this won't get written to
* disk.
* to disk.
*/
bp->b_flags |= XBF_DONE;
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bp->b_iodone = xfs_buf_iodone_callbacks;
bip->bli_item.li_cb = xfs_buf_iodone;
bip->bli_item.li_cb = xfs_buf_item_iodone;
/*
* If we invalidated the buffer within this transaction, then
@ -651,7 +644,7 @@ xfs_trans_stale_inode_buf(
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bip->bli_flags |= XFS_BLI_STALE_INODE;
bip->bli_item.li_cb = xfs_buf_iodone;
bip->bli_item.li_cb = xfs_buf_item_iodone;
bp->b_flags |= _XBF_INODES;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
}