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ocfs2: Fix sleep-with-spinlock recovery regression

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This fixes a bug introduced with 539d826409:
    [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>
This commit is contained in:
Mark Fasheh 2008-08-19 17:20:28 -07:00
parent a57a874b04
commit a1af7d15a1
1 changed files with 14 additions and 9 deletions
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23
fs/ocfs2/journal.c
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@ -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: