This is a note to let you know that I've just added the patch titled
NFS: Remove bad delegations during open recovery
to the 3.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfs-remove-bad-delegations-during-open-recovery.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 6938867edba929a65a167a97581231e76aeb10b4 Mon Sep 17 00:00:00 2001
From: Bryan Schumaker <[email protected]>
Date: Wed, 26 Sep 2012 15:25:52 -0400
Subject: NFS: Remove bad delegations during open recovery
From: Bryan Schumaker <[email protected]>
commit 6938867edba929a65a167a97581231e76aeb10b4 upstream.
I put the client into an open recovery loop by:
Client: Open file
read half
Server: Expire client (echo 0 > /sys/kernel/debug/nfsd/forget_clients)
Client: Drop vm cache (echo 3 > /proc/sys/vm/drop_caches)
finish reading file
This causes a loop because the client never updates the nfs4_state after
discovering that the delegation is invalid. This means it will keep
trying to read using the bad delegation rather than attempting to re-open
the file.
Signed-off-by: Bryan Schumaker <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/nfs/nfs4proc.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1774,7 +1774,11 @@ static void nfs41_clear_delegation_state
* informs us the stateid is unrecognized. */
if (status != -NFS4ERR_BAD_STATEID)
nfs41_free_stateid(server, stateid);
+ nfs_remove_bad_delegation(state->inode);
+ write_seqlock(&state->seqlock);
+ nfs4_stateid_copy(&state->stateid, &state->open_stateid);
+ write_sequnlock(&state->seqlock);
clear_bit(NFS_DELEGATED_STATE, &state->flags);
}
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.6/nfs-remove-bad-delegations-during-open-recovery.patch
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