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authorSage Weil <sage@newdream.net>2010-03-19 13:24:39 -0700
committerSage Weil <sage@newdream.net>2010-03-23 07:47:02 -0700
commitec4318bcb4c59d8b8bf7037c9f444a9887ccb265 (patch)
tree9c471ed9e33b864253166c255c1fd601b909c7af /fs/ceph/snap.c
parent87b315a5b5cec5d7086494b203577602f5befc8c (diff)
downloadlinux-ec4318bcb4c59d8b8bf7037c9f444a9887ccb265.tar.bz2
ceph: fix snap rebuild condition
We were rebuilding the snap context when it was not necessary (i.e. when the realm seq hadn't changed _and_ the parent seq was still older), which caused page snapc pointers to not match the realm's snapc pointer (even though the snap context itself was identical). This confused begin_write and put it into an endless loop. The correct logic is: rebuild snapc if _my_ realm seq changed, or if my parent realm's seq is newer than mine (and thus mine needs to be rebuilt too). Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/snap.c')
-rw-r--r--fs/ceph/snap.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 8a43bc8675eb..df04e210a055 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -314,9 +314,9 @@ static int build_snap_context(struct ceph_snap_realm *realm)
because we rebuild_snap_realms() works _downward_ in
hierarchy after each update.) */
if (realm->cached_context &&
- realm->cached_context->seq <= realm->seq &&
+ realm->cached_context->seq == realm->seq &&
(!parent ||
- realm->cached_context->seq <= parent->cached_context->seq)) {
+ realm->cached_context->seq >= parent->cached_context->seq)) {
dout("build_snap_context %llx %p: %p seq %lld (%d snaps)"
" (unchanged)\n",
realm->ino, realm, realm->cached_context,