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xfs: replace barriers with explicit flush / FUA usage 

Switch to the WRITE_FLUSH_FUA flag for log writes and remove the EOPNOTSUPP
detection for barriers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
hifive-unleashed-5.1
Christoph Hellwig 2010-08-18 05:29:11 -04:00 committed by Jens Axboe
parent 2cf6d26a35
commit 80f6c29d8a
4 changed files with 3 additions and 38 deletions
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16
fs/xfs/linux-2.6/xfs_buf.c
View File

@ -929,19 +929,7 @@ xfs_buf_iodone_work(
xfs_buf_t *bp =
container_of(work, xfs_buf_t, b_iodone_work);
/*
* We can get an EOPNOTSUPP to ordered writes. Here we clear the
* ordered flag and reissue them. Because we can't tell the higher
* layers directly that they should not issue ordered I/O anymore, they
* need to check if the _XFS_BARRIER_FAILED flag was set during I/O completion.
*/
if ((bp->b_error == EOPNOTSUPP) &&
(bp->b_flags & (XBF_ORDERED|XBF_ASYNC)) == (XBF_ORDERED|XBF_ASYNC)) {
trace_xfs_buf_ordered_retry(bp, _RET_IP_);
bp->b_flags &= ~XBF_ORDERED;
bp->b_flags |= _XFS_BARRIER_FAILED;
xfs_buf_iorequest(bp);
} else if (bp->b_iodone)
if (bp->b_iodone)
(*(bp->b_iodone))(bp);
else if (bp->b_flags & XBF_ASYNC)
xfs_buf_relse(bp);
@ -1200,7 +1188,7 @@ _xfs_buf_ioapply(
if (bp->b_flags & XBF_ORDERED) {
ASSERT(!(bp->b_flags & XBF_READ));
rw = WRITE_BARRIER;
rw = WRITE_FLUSH_FUA;
} else if (bp->b_flags & XBF_LOG_BUFFER) {
ASSERT(!(bp->b_flags & XBF_READ_AHEAD));
bp->b_flags &= ~_XBF_RUN_QUEUES;

11
fs/xfs/linux-2.6/xfs_buf.h
View File

@ -86,14 +86,6 @@ typedef enum {
*/
#define _XBF_PAGE_LOCKED (1 << 22)
/*
* If we try a barrier write, but it fails we have to communicate
* this to the upper layers. Unfortunately b_error gets overwritten
* when the buffer is re-issued so we have to add another flag to
* keep this information.
*/
#define _XFS_BARRIER_FAILED (1 << 23)
typedef unsigned int xfs_buf_flags_t;
#define XFS_BUF_FLAGS \
@ -114,8 +106,7 @@ typedef unsigned int xfs_buf_flags_t;
{ _XBF_PAGES, "PAGES" }, \
{ _XBF_RUN_QUEUES, "RUN_QUEUES" }, \
{ _XBF_DELWRI_Q, "DELWRI_Q" }, \
{ _XBF_PAGE_LOCKED, "PAGE_LOCKED" }, \
{ _XFS_BARRIER_FAILED, "BARRIER_FAILED" }
{ _XBF_PAGE_LOCKED, "PAGE_LOCKED" }
typedef enum {

1
fs/xfs/linux-2.6/xfs_trace.h
View File

@ -325,7 +325,6 @@ DEFINE_BUF_EVENT(xfs_buf_lock);
DEFINE_BUF_EVENT(xfs_buf_lock_done);
DEFINE_BUF_EVENT(xfs_buf_cond_lock);
DEFINE_BUF_EVENT(xfs_buf_unlock);
DEFINE_BUF_EVENT(xfs_buf_ordered_retry);
DEFINE_BUF_EVENT(xfs_buf_iowait);
DEFINE_BUF_EVENT(xfs_buf_iowait_done);
DEFINE_BUF_EVENT(xfs_buf_delwri_queue);

13
fs/xfs/xfs_log.c
View File

@ -916,19 +916,6 @@ xlog_iodone(xfs_buf_t *bp)
aborted = 0;
l = iclog->ic_log;
/*
* If the _XFS_BARRIER_FAILED flag was set by a lower
* layer, it means the underlying device no longer supports
* barrier I/O. Warn loudly and turn off barriers.
*/
if (bp->b_flags & _XFS_BARRIER_FAILED) {
bp->b_flags &= ~_XFS_BARRIER_FAILED;
l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER;
xfs_fs_cmn_err(CE_WARN, l->l_mp,
"xlog_iodone: Barriers are no longer supported"
" by device. Disabling barriers\n");
}
/*
* Race to shutdown the filesystem if we see an error.
*/