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authorMark Fasheh <mfasheh@suse.com>2008-08-19 17:20:28 -0700
committerMark Fasheh <mfasheh@suse.com>2008-08-22 11:08:38 -0700
commita1af7d15a18d1e375b0a6fee93789a0bbfe088b4 (patch)
tree24af83391b39cf787b7579859682c4050970ed76 /fs/ocfs2/journal.c
parenta57a874b04e27cb530a0e18c244387452e73ccce (diff)
ocfs2: Fix sleep-with-spinlock recovery regression
This fixes a bug introduced with 539d8264093560b917ee3afe4c7f74e5da09d6a5: [PATCH 2/2] ocfs2: Fix race between mount and recovery ocfs2_mark_dead_nodes() was reading journal inodes while holding the spinlock protecting our in-memory recovery state. The fix is very simple - the disk state is protected by a cluster lock that's already held, so we just move the spinlock down past the read. Reviewed-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2/journal.c')
-rw-r--r--fs/ocfs2/journal.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 7a37240f7a31..c47bc2a809c2 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -1418,13 +1418,13 @@ int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
{
unsigned int node_num;
int status, i;
+ u32 gen;
struct buffer_head *bh = NULL;
struct ocfs2_dinode *di;
/* This is called with the super block cluster lock, so we
* know that the slot map can't change underneath us. */
- spin_lock(&osb->osb_lock);
for (i = 0; i < osb->max_slots; i++) {
/* Read journal inode to get the recovery generation */
status = ocfs2_read_journal_inode(osb, i, &bh, NULL);
@@ -1433,23 +1433,31 @@ int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
goto bail;
}
di = (struct ocfs2_dinode *)bh->b_data;
- osb->slot_recovery_generations[i] =
- ocfs2_get_recovery_generation(di);
+ gen = ocfs2_get_recovery_generation(di);
brelse(bh);
bh = NULL;
+ spin_lock(&osb->osb_lock);
+ osb->slot_recovery_generations[i] = gen;
+
mlog(0, "Slot %u recovery generation is %u\n", i,
osb->slot_recovery_generations[i]);
- if (i == osb->slot_num)
+ if (i == osb->slot_num) {
+ spin_unlock(&osb->osb_lock);
continue;
+ }
status = ocfs2_slot_to_node_num_locked(osb, i, &node_num);
- if (status == -ENOENT)
+ if (status == -ENOENT) {
+ spin_unlock(&osb->osb_lock);
continue;
+ }
- if (__ocfs2_recovery_map_test(osb, node_num))
+ if (__ocfs2_recovery_map_test(osb, node_num)) {
+ spin_unlock(&osb->osb_lock);
continue;
+ }
spin_unlock(&osb->osb_lock);
/* Ok, we have a slot occupied by another node which
@@ -1465,10 +1473,7 @@ int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
mlog_errno(status);
goto bail;
}
-
- spin_lock(&osb->osb_lock);
}
- spin_unlock(&osb->osb_lock);
status = 0;
bail: