diff options
| author | Sage Weil <sage@newdream.net> | 2009-12-21 20:40:34 -0800 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2009-12-23 08:17:14 -0800 |
| commit | 5dacf09121ffb2e5fc7d15b78cae0b77042a1935 (patch) | |
| tree | 8a4ec2fde459f93936a91644d024673d37347408 /fs/ceph/caps.c | |
| parent | 7067f797b8409f1e10ec95ac2c1e17a200173d13 (diff) | |
| download | linux-5dacf09121ffb2e5fc7d15b78cae0b77042a1935.tar.bz2 | |
ceph: do not touch_caps while iterating over caps list
Avoid confusing iterate_session_caps(), flag the session while we are
iterating so that __touch_cap does not rearrange items on the list.
All other modifiers of session->s_caps do so under the protection of
s_mutex.
Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/caps.c')
| -rw-r--r-- | fs/ceph/caps.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index dfb509f53542..93c1afe3f0b3 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -697,10 +697,15 @@ static void __touch_cap(struct ceph_cap *cap) { struct ceph_mds_session *s = cap->session; - dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, - s->s_mds); spin_lock(&s->s_cap_lock); - list_move_tail(&cap->session_caps, &s->s_caps); + if (!s->s_iterating_caps) { + dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, + s->s_mds); + list_move_tail(&cap->session_caps, &s->s_caps); + } else { + dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n", + &cap->ci->vfs_inode, cap, s->s_mds); + } spin_unlock(&s->s_cap_lock); } |