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authorSteven Whitehouse <swhiteho@redhat.com>2011-09-07 10:33:25 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2011-10-21 12:39:41 +0100
commitb5b24d7aeb9608935786369ac2d3e9f362877d55 (patch)
tree2043123df7a6e6ca367b24cb3442ee50314cdee0 /fs/gfs2/glops.c
parent70b0c3656f12964a6dac104214c904c66e626058 (diff)
downloadop-kernel-dev-b5b24d7aeb9608935786369ac2d3e9f362877d55.zip
op-kernel-dev-b5b24d7aeb9608935786369ac2d3e9f362877d55.tar.gz
GFS2: Fix AIL flush issue during fsync
Unfortunately, it is not enough to just ignore locked buffers during the AIL flush from fsync. We need to be able to ignore all buffers which are locked, dirty or pinned at this stage as they might have been added subsequent to the log flush earlier in the fsync function. In addition, this means that we no longer need to rely on i_mutex to keep out writes during fsync, so we can, as a side-effect, remove that protection too. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Tested-By: Abhijith Das <adas@redhat.com>
Diffstat (limited to 'fs/gfs2/glops.c')
-rw-r--r--fs/gfs2/glops.c32
1 files changed, 16 insertions, 16 deletions
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 951541b..78418b4 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -42,41 +42,41 @@ static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
/**
* __gfs2_ail_flush - remove all buffers for a given lock from the AIL
* @gl: the glock
+ * @fsync: set when called from fsync (not all buffers will be clean)
*
* None of the buffers should be dirty, locked, or pinned.
*/
-static void __gfs2_ail_flush(struct gfs2_glock *gl, unsigned long b_state)
+static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
{
struct gfs2_sbd *sdp = gl->gl_sbd;
struct list_head *head = &gl->gl_ail_list;
- struct gfs2_bufdata *bd;
+ struct gfs2_bufdata *bd, *tmp;
struct buffer_head *bh;
+ const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
sector_t blocknr;
+ gfs2_log_lock(sdp);
spin_lock(&sdp->sd_ail_lock);
- while (!list_empty(head)) {
- bd = list_entry(head->next, struct gfs2_bufdata,
- bd_ail_gl_list);
+ list_for_each_entry_safe(bd, tmp, head, bd_ail_gl_list) {
bh = bd->bd_bh;
- blocknr = bh->b_blocknr;
- if (bh->b_state & b_state)
+ if (bh->b_state & b_state) {
+ if (fsync)
+ continue;
gfs2_ail_error(gl, bh);
+ }
+ blocknr = bh->b_blocknr;
bh->b_private = NULL;
gfs2_remove_from_ail(bd); /* drops ref on bh */
- spin_unlock(&sdp->sd_ail_lock);
bd->bd_bh = NULL;
bd->bd_blkno = blocknr;
- gfs2_log_lock(sdp);
gfs2_trans_add_revoke(sdp, bd);
- gfs2_log_unlock(sdp);
-
- spin_lock(&sdp->sd_ail_lock);
}
- gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
+ BUG_ON(!fsync && atomic_read(&gl->gl_ail_count));
spin_unlock(&sdp->sd_ail_lock);
+ gfs2_log_unlock(sdp);
}
@@ -99,13 +99,13 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
BUG_ON(current->journal_info);
current->journal_info = &tr;
- __gfs2_ail_flush(gl, (1ul << BH_Dirty)|(1ul << BH_Pinned)|(1ul << BH_Lock));
+ __gfs2_ail_flush(gl, 0);
gfs2_trans_end(sdp);
gfs2_log_flush(sdp, NULL);
}
-void gfs2_ail_flush(struct gfs2_glock *gl)
+void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
{
struct gfs2_sbd *sdp = gl->gl_sbd;
unsigned int revokes = atomic_read(&gl->gl_ail_count);
@@ -117,7 +117,7 @@ void gfs2_ail_flush(struct gfs2_glock *gl)
ret = gfs2_trans_begin(sdp, 0, revokes);
if (ret)
return;
- __gfs2_ail_flush(gl, (1ul << BH_Dirty)|(1ul << BH_Pinned));
+ __gfs2_ail_flush(gl, fsync);
gfs2_trans_end(sdp);
gfs2_log_flush(sdp, NULL);
}
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