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| author | Steven Whitehouse <swhiteho@redhat.com> | 2011-04-26 10:23:56 +0100 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2011-05-03 11:48:07 +0100 |
| commit | 4f1de018215fb56940ce5793e11becd1e8cd6e44 (patch) | |
| tree | 4f90d7ef5e219615eab7c45e421fa45cb2729b1e /fs | |
| parent | 6905d9e4dda6112f007e9090bca80507da158e63 (diff) | |
| download | linux-exynos-4f1de018215fb56940ce5793e11becd1e8cd6e44.tar.gz linux-exynos-4f1de018215fb56940ce5793e11becd1e8cd6e44.tar.bz2 linux-exynos-4f1de018215fb56940ce5793e11becd1e8cd6e44.zip | |
GFS2: Fix ail list traversal
In the recent patches to update the AIL list code, I managed to
forget that the ail list lock got dropped, even though I
added a comment specifically to remind myself :(
Reported-by: Barry Marson <bmarson@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/gfs2/log.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c index ad1f1887633f..cec26c00b50d 100644 --- a/fs/gfs2/log.c +++ b/fs/gfs2/log.c @@ -89,9 +89,9 @@ void gfs2_remove_from_ail(struct gfs2_bufdata *bd) * */ -static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, - struct writeback_control *wbc, - struct gfs2_ail *ai) +static int gfs2_ail1_start_one(struct gfs2_sbd *sdp, + struct writeback_control *wbc, + struct gfs2_ail *ai) __releases(&sdp->sd_ail_lock) __acquires(&sdp->sd_ail_lock) { @@ -100,7 +100,6 @@ __acquires(&sdp->sd_ail_lock) struct gfs2_bufdata *bd, *s; struct buffer_head *bh; -restart: list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, bd_ail_st_list) { bh = bd->bd_bh; @@ -120,13 +119,17 @@ restart: gl = bd->bd_gl; list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); mapping = bh->b_page->mapping; + if (!mapping) + continue; spin_unlock(&sdp->sd_ail_lock); generic_writepages(mapping, wbc); spin_lock(&sdp->sd_ail_lock); if (wbc->nr_to_write <= 0) break; - goto restart; + return 1; } + + return 0; } @@ -146,10 +149,12 @@ void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc) trace_gfs2_ail_flush(sdp, wbc, 1); spin_lock(&sdp->sd_ail_lock); +restart: list_for_each_entry_reverse(ai, head, ai_list) { if (wbc->nr_to_write <= 0) break; - gfs2_ail1_start_one(sdp, wbc, ai); /* This may drop ail lock */ + if (gfs2_ail1_start_one(sdp, wbc, ai)) + goto restart; } spin_unlock(&sdp->sd_ail_lock); trace_gfs2_ail_flush(sdp, wbc, 0); |