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authorSage Weil <sage@newdream.net>2010-07-15 13:24:32 -0700
committerSage Weil <sage@newdream.net>2010-07-16 10:30:17 -0700
commit01a92f174f8a3b99dbb5e02c86e7ee1e576737af (patch)
treead478397d935b4b09340408cbacf8c6d35dee9d1 /fs
parentf91d3471ccf1ca9a795f46c94b1ded8dd219940c (diff)
ceph: reuse request message when replaying against recovering mds
Replayed rename operations (after an mds failure/recovery) were broken because the request paths were regenerated from the dentry names, which get mangled when d_move() is called. Instead, resend the previous request message when replaying completed operations. Just make sure the REPLAY flag is set and the target ino is filled in. This fixes problems with workloads doing renames when the MDS restarts, where the rename operation appears to succeed, but on mds restart then fails (leading to client confusion, app breakage, etc.). Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs')
-rw-r--r--fs/ceph/mds_client.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 3ab79f6c4ce8..23332bc44515 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1580,6 +1580,27 @@ static int __prepare_send_request(struct ceph_mds_client *mdsc,
dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
+ if (req->r_got_unsafe) {
+ /*
+ * Replay. Do not regenerate message (and rebuild
+ * paths, etc.); just use the original message.
+ * Rebuilding paths will break for renames because
+ * d_move mangles the src name.
+ */
+ msg = req->r_request;
+ rhead = msg->front.iov_base;
+
+ flags = le32_to_cpu(rhead->flags);
+ flags |= CEPH_MDS_FLAG_REPLAY;
+ rhead->flags = cpu_to_le32(flags);
+
+ if (req->r_target_inode)
+ rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
+
+ rhead->num_retry = req->r_attempts - 1;
+ return 0;
+ }
+
if (req->r_request) {
ceph_msg_put(req->r_request);
req->r_request = NULL;
@@ -1601,13 +1622,9 @@ static int __prepare_send_request(struct ceph_mds_client *mdsc,
rhead->flags = cpu_to_le32(flags);
rhead->num_fwd = req->r_num_fwd;
rhead->num_retry = req->r_attempts - 1;
+ rhead->ino = 0;
dout(" r_locked_dir = %p\n", req->r_locked_dir);
-
- if (req->r_target_inode && req->r_got_unsafe)
- rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
- else
- rhead->ino = 0;
return 0;
}

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