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xfs: kill __xfs_buf_submit_common()

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Now that there is only one caller, fold the common submission helper
into __xfs_buf_submit().

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-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:
Brian Foster 2018-07-11 22:26:35 -07:00 committed by Darrick J. Wong
parent 6af88cda00
commit bb00b6f1e2
1 changed files with 34 additions and 49 deletions
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83
fs/xfs/xfs_buf.c
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@ -1449,15 +1449,34 @@ _xfs_buf_ioapply(
}
/*
* Asynchronous IO submission path. This transfers the buffer lock ownership and
* the current reference to the IO. It is not safe to reference the buffer after
* a call to this function unless the caller holds an additional reference
* itself.
* Wait for I/O completion of a sync buffer and return the I/O error code.
*/
static int
__xfs_buf_submit_common(
xfs_buf_iowait(
struct xfs_buf *bp)
{
ASSERT(!(bp->b_flags & XBF_ASYNC));
trace_xfs_buf_iowait(bp, _RET_IP_);
wait_for_completion(&bp->b_iowait);
trace_xfs_buf_iowait_done(bp, _RET_IP_);
return bp->b_error;
}
/*
* Buffer I/O submission path, read or write. Asynchronous submission transfers
* the buffer lock ownership and the current reference to the IO. It is not
* safe to reference the buffer after a call to this function unless the caller
* holds an additional reference itself.
*/
int
__xfs_buf_submit(
struct xfs_buf *bp,
bool wait)
{
int error = 0;
trace_xfs_buf_submit(bp, _RET_IP_);
ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
@ -1467,9 +1486,18 @@ __xfs_buf_submit_common(
xfs_buf_ioerror(bp, -EIO);
bp->b_flags &= ~XBF_DONE;
xfs_buf_stale(bp);
if (bp->b_flags & XBF_ASYNC)
xfs_buf_ioend(bp);
return -EIO;
}
/*
* Grab a reference so the buffer does not go away underneath us. For
* async buffers, I/O completion drops the callers reference, which
* could occur before submission returns.
*/
xfs_buf_hold(bp);
if (bp->b_flags & XBF_WRITE)
xfs_buf_wait_unpin(bp);
@ -1498,52 +1526,9 @@ __xfs_buf_submit_common(
xfs_buf_ioend_async(bp);
}
return 0;
}
/*
* Wait for I/O completion of a sync buffer and return the I/O error code.
*/
static int
xfs_buf_iowait(
struct xfs_buf *bp)
{
ASSERT(!(bp->b_flags & XBF_ASYNC));
trace_xfs_buf_iowait(bp, _RET_IP_);
wait_for_completion(&bp->b_iowait);
trace_xfs_buf_iowait_done(bp, _RET_IP_);
return bp->b_error;
}
/*
* Synchronous buffer IO submission path, read or write.
*/
int
__xfs_buf_submit(
struct xfs_buf *bp,
bool wait)
{
int error;
/*
* Grab a reference so the buffer does not go away underneath us. For
* async buffers, I/O completion drops the callers reference, which
* could occur before submission returns.
*/
xfs_buf_hold(bp);
error = __xfs_buf_submit_common(bp);
if (error) {
if (bp->b_flags & XBF_ASYNC)
xfs_buf_ioend(bp);
goto out;
}
if (wait)
error = xfs_buf_iowait(bp);
out:
/*
* Release the hold that keeps the buffer referenced for the entire
* I/O. Note that if the buffer is async, it is not safe to reference