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authorAdrian Hunter <ext-adrian.hunter@nokia.com>2008-09-12 09:27:47 (GMT)
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-09-17 11:23:26 (GMT)
commit6dcfac4f13d6b32fbaa60b64a23249999e66af8e (patch)
tree007884a8327658dc53252c7f1be9ab9daeb7ea14 /fs/ubifs/gc.c
parent0855f310dff76ae42c5aac32f600f8f692bbd23f (diff)
downloadlinux-6dcfac4f13d6b32fbaa60b64a23249999e66af8e.tar.xz
UBIFS: TNC / GC race fixes
- update GC sequence number if any nodes may have been moved even if GC did not finish the LEB - don't ignore error return when reading Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'fs/ubifs/gc.c')
-rw-r--r--fs/ubifs/gc.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/ubifs/gc.c b/fs/ubifs/gc.c
index 13f1019..02aba36 100644
--- a/fs/ubifs/gc.c
+++ b/fs/ubifs/gc.c
@@ -334,15 +334,15 @@ int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp)
err = move_nodes(c, sleb);
if (err)
- goto out;
+ goto out_inc_seq;
err = gc_sync_wbufs(c);
if (err)
- goto out;
+ goto out_inc_seq;
err = ubifs_change_one_lp(c, lnum, c->leb_size, 0, 0, 0, 0);
if (err)
- goto out;
+ goto out_inc_seq;
/* Allow for races with TNC */
c->gced_lnum = lnum;
@@ -369,6 +369,14 @@ int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp)
out:
ubifs_scan_destroy(sleb);
return err;
+
+out_inc_seq:
+ /* We may have moved at least some nodes so allow for races with TNC */
+ c->gced_lnum = lnum;
+ smp_wmb();
+ c->gc_seq += 1;
+ smp_wmb();
+ goto out;
}
/**