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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-04-11 16:48:44 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-26 07:47:53 -0700 |
| commit | 9c84e4813a02a219d61f61967d7058f2d8037d88 (patch) | |
| tree | 2d9d9aa2a465e30cda0fa984117bbe60004de705 /fs | |
| parent | a354226edbcd28cd1a55d0abbbbc9a703ba26f1c (diff) | |
| download | kernel-crypto-9c84e4813a02a219d61f61967d7058f2d8037d88.tar.gz kernel-crypto-9c84e4813a02a219d61f61967d7058f2d8037d88.tar.xz kernel-crypto-9c84e4813a02a219d61f61967d7058f2d8037d88.zip | |
NFSv4: fix delegated locking
commit 0df5dd4aae211edeeeb84f7f84f6d093406d7c22 upstream.
Arnaud Giersch reports that NFSv4 locking is broken when we hold a
delegation since commit 8e469ebd6dc32cbaf620e134d79f740bf0ebab79 (NFSv4:
Don't allow posix locking against servers that don't support it).
According to Arnaud, the lock succeeds the first time he opens the file
(since we cannot do a delegated open) but then fails after we start using
delegated opens.
The following patch fixes it by ensuring that locking behaviour is
governed by a per-filesystem capability flag that is initially set, but
gets cleared if the server ever returns an OPEN without the
NFS4_OPEN_RESULT_LOCKTYPE_POSIX flag being set.
Reported-by: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/client.c | 3 | ||||
| -rw-r--r-- | fs/nfs/nfs4proc.c | 4 |
2 files changed, 5 insertions, 2 deletions
diff --git a/fs/nfs/client.c b/fs/nfs/client.c index ee77713ce68..bd39abc5150 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -1293,7 +1293,8 @@ static int nfs4_init_server(struct nfs_server *server, /* Initialise the client representation from the mount data */ server->flags = data->flags; - server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; + server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR| + NFS_CAP_POSIX_LOCK; server->options = data->options; /* Get a client record */ diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 375f0fae2c6..ecf66020475 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1520,6 +1520,8 @@ static int _nfs4_proc_open(struct nfs4_opendata *data) nfs_post_op_update_inode(dir, o_res->dir_attr); } else nfs_refresh_inode(dir, o_res->dir_attr); + if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) + server->caps &= ~NFS_CAP_POSIX_LOCK; if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { status = _nfs4_proc_open_confirm(data); if (status != 0) @@ -1660,7 +1662,7 @@ static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, in status = PTR_ERR(state); if (IS_ERR(state)) goto err_opendata_put; - if ((opendata->o_res.rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) != 0) + if (server->caps & NFS_CAP_POSIX_LOCK) set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); nfs4_opendata_put(opendata); nfs4_put_state_owner(sp); |