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authorSteven Whitehouse <swhiteho@redhat.com>2008-09-26 05:23:22 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2008-09-26 05:23:22 -0400
commit254db57f9b12daba841a4d91ddb9a8161e9c74ba (patch)
treee5d4f107d8bdf6278738c85a67b54d96d1a900e8 /fs/gfs2/log.c
parent6d80c39f9155e289fe8037a8b6352931ff916ceb (diff)
GFS2: Support for I/O barriers
This patch adds barrier support to GFS2. There is not a lot of change really... we just add the barrier flag when we write journal header blocks. If the underlying device refuses to support them, we fall back to the previous way of doing things (wait for the I/O and hope) since there is nothing else we can do. There is no user configuration, barriers will always be on unless the device refuses to support them. This seems a reasonable solution to me since this is a correctness issue. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/log.c')
-rw-r--r--fs/gfs2/log.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 6c6af9f5e3ab..ad305854bdc6 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -18,6 +18,7 @@
18#include <linux/delay.h> 18#include <linux/delay.h>
19#include <linux/kthread.h> 19#include <linux/kthread.h>
20#include <linux/freezer.h> 20#include <linux/freezer.h>
21#include <linux/bio.h>
21 22
22#include "gfs2.h" 23#include "gfs2.h"
23#include "incore.h" 24#include "incore.h"
@@ -584,7 +585,6 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
584 memset(bh->b_data, 0, bh->b_size); 585 memset(bh->b_data, 0, bh->b_size);
585 set_buffer_uptodate(bh); 586 set_buffer_uptodate(bh);
586 clear_buffer_dirty(bh); 587 clear_buffer_dirty(bh);
587 unlock_buffer(bh);
588 588
589 gfs2_ail1_empty(sdp, 0); 589 gfs2_ail1_empty(sdp, 0);
590 tail = current_tail(sdp); 590 tail = current_tail(sdp);
@@ -601,8 +601,23 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
601 hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); 601 hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
602 lh->lh_hash = cpu_to_be32(hash); 602 lh->lh_hash = cpu_to_be32(hash);
603 603
604 set_buffer_dirty(bh); 604 bh->b_end_io = end_buffer_write_sync;
605 if (sync_dirty_buffer(bh)) 605 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
606 goto skip_barrier;
607 get_bh(bh);
608 submit_bh(WRITE_BARRIER | (1 << BIO_RW_META), bh);
609 wait_on_buffer(bh);
610 if (buffer_eopnotsupp(bh)) {
611 clear_buffer_eopnotsupp(bh);
612 set_buffer_uptodate(bh);
613 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
614 lock_buffer(bh);
615skip_barrier:
616 get_bh(bh);
617 submit_bh(WRITE_SYNC | (1 << BIO_RW_META), bh);
618 wait_on_buffer(bh);
619 }
620 if (!buffer_uptodate(bh))
606 gfs2_io_error_bh(sdp, bh); 621 gfs2_io_error_bh(sdp, bh);
607 brelse(bh); 622 brelse(bh);
608 623