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xfs: simplify the xfs_buf_ioend_disposition calling convention 

Now that all the actual error handling is in a single place,
xfs_buf_ioend_disposition just needs to return true if took ownership of
the buffer, or false if not instead of the tristate.  Also move the
error check back in the caller to optimize for the fast path, and give
the function a better fitting name.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2020-09-01 10:55:45 -07:00 committed by Darrick J. Wong
parent 844c9358df
commit 70796c6b74
1 changed files with 9 additions and 27 deletions
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36
fs/xfs/xfs_buf.c
View File

@ -1223,29 +1223,17 @@ xfs_buf_ioerror_permanent(
* If we get repeated async write failures, then we take action according to the
* error configuration we have been set up to use.
*
* Multi-state return value:
*
* XBF_IOEND_FINISH: run callback completions
* XBF_IOEND_DONE: resubmitted immediately, do not run any completions
* XBF_IOEND_FAIL: transient error, run failure callback completions and then
* release the buffer
* Returns true if this function took care of error handling and the caller must
* not touch the buffer again. Return false if the caller should proceed with
* normal I/O completion handling.
*/
enum xfs_buf_ioend_disposition {
XBF_IOEND_FINISH,
XBF_IOEND_DONE,
XBF_IOEND_FAIL,
};
static enum xfs_buf_ioend_disposition
xfs_buf_ioend_disposition(
static bool
xfs_buf_ioend_handle_error(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_mount;
struct xfs_error_cfg *cfg;
if (likely(!bp->b_error))
return XBF_IOEND_FINISH;
/*
* If we've already decided to shutdown the filesystem because of I/O
* errors, there's no point in giving this a retry.
@ -1291,18 +1279,18 @@ xfs_buf_ioend_disposition(
ASSERT(list_empty(&bp->b_li_list));
xfs_buf_ioerror(bp, 0);
xfs_buf_relse(bp);
return XBF_IOEND_FAIL;
return true;
resubmit:
xfs_buf_ioerror(bp, 0);
bp->b_flags |= (XBF_WRITE | XBF_DONE | XBF_WRITE_FAIL);
xfs_buf_submit(bp);
return XBF_IOEND_DONE;
return true;
out_stale:
xfs_buf_stale(bp);
bp->b_flags |= XBF_DONE;
trace_xfs_buf_error_relse(bp, _RET_IP_);
return XBF_IOEND_FINISH;
return false;
}
static void
@ -1340,14 +1328,8 @@ xfs_buf_ioend(
bp->b_flags |= XBF_DONE;
}
switch (xfs_buf_ioend_disposition(bp)) {
case XBF_IOEND_DONE:
if (unlikely(bp->b_error) && xfs_buf_ioend_handle_error(bp))
return;
case XBF_IOEND_FAIL:
return;
default:
break;
}
/* clear the retry state */
bp->b_last_error = 0;