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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>
This commit is contained in:
Sage Weil 2010-07-15 13:24:32 -07:00
parent f91d3471cc
commit 01a92f174f
1 changed files with 22 additions and 5 deletions
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27
fs/ceph/mds_client.c
View File

@ -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;
}