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ceph: only release clean, unused caps with mds requests 

We can drop caps with an mds request.  Ensure we only drop unused AND
clean caps, since the MDS doesn't support cap writeback in that context,
nor do we track it.  If caps are dirty, and the MDS needs them back, we
it will revoke and we will flush in the normal fashion.

This fixes a possibly loss of metadata.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-06-24 15:12:37 -07:00
parent a1a31e7342
commit ec97f88ba6
1 changed files with 6 additions and 5 deletions
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11
fs/ceph/caps.c
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@ -2886,18 +2886,19 @@ int ceph_encode_inode_release(void **p, struct inode *inode,
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap *cap;
struct ceph_mds_request_release *rel = *p;
int used, dirty;
int ret = 0;
int used = 0;
spin_lock(&inode->i_lock);
used = __ceph_caps_used(ci);
dirty = __ceph_caps_dirty(ci);
dout("encode_inode_release %p mds%d used %s drop %s unless %s\n", inode,
mds, ceph_cap_string(used), ceph_cap_string(drop),
dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
ceph_cap_string(unless));
/* only drop unused caps */
drop &= ~used;
/* only drop unused, clean caps */
drop &= ~(used | dirty);
cap = __get_cap_for_mds(ci, mds);
if (cap && __cap_is_valid(cap)) {