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authorSage Weil <sage@newdream.net>2010-06-04 10:05:40 -0700
committerSage Weil <sage@newdream.net>2010-06-04 10:05:40 -0700
commit1e5ea23df11c7c90c7e7268dd3a6603bfa5aadf7 (patch)
treed7a09a153c3b00add2eee343d8584bc90b1cb848 /fs
parent558d3499bd059d4534b1f2b69dc1c562acc733fe (diff)
downloadop-kernel-dev-1e5ea23df11c7c90c7e7268dd3a6603bfa5aadf7.zip
op-kernel-dev-1e5ea23df11c7c90c7e7268dd3a6603bfa5aadf7.tar.gz
ceph: fix lease revocation when seq doesn't match
If the client revokes a lease with a higher seq than what we have, keep the mds's seq, so that it honors our release. Otherwise, we can hang indefinitely. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs')
-rw-r--r--fs/ceph/mds_client.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index b49f128..29b4485 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2433,6 +2433,7 @@ static void handle_lease(struct ceph_mds_client *mdsc,
struct ceph_dentry_info *di;
int mds = session->s_mds;
struct ceph_mds_lease *h = msg->front.iov_base;
+ u32 seq;
struct ceph_vino vino;
int mask;
struct qstr dname;
@@ -2446,6 +2447,7 @@ static void handle_lease(struct ceph_mds_client *mdsc,
vino.ino = le64_to_cpu(h->ino);
vino.snap = CEPH_NOSNAP;
mask = le16_to_cpu(h->mask);
+ seq = le32_to_cpu(h->seq);
dname.name = (void *)h + sizeof(*h) + sizeof(u32);
dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
if (dname.len != get_unaligned_le32(h+1))
@@ -2456,8 +2458,9 @@ static void handle_lease(struct ceph_mds_client *mdsc,
/* lookup inode */
inode = ceph_find_inode(sb, vino);
- dout("handle_lease '%s', mask %d, ino %llx %p\n",
- ceph_lease_op_name(h->action), mask, vino.ino, inode);
+ dout("handle_lease %s, mask %d, ino %llx %p %.*s\n",
+ ceph_lease_op_name(h->action), mask, vino.ino, inode,
+ dname.len, dname.name);
if (inode == NULL) {
dout("handle_lease no inode %llx\n", vino.ino);
goto release;
@@ -2482,7 +2485,8 @@ static void handle_lease(struct ceph_mds_client *mdsc,
switch (h->action) {
case CEPH_MDS_LEASE_REVOKE:
if (di && di->lease_session == session) {
- h->seq = cpu_to_le32(di->lease_seq);
+ if (ceph_seq_cmp(di->lease_seq, seq) > 0)
+ h->seq = cpu_to_le32(di->lease_seq);
__ceph_mdsc_drop_dentry_lease(dentry);
}
release = 1;
@@ -2496,7 +2500,7 @@ static void handle_lease(struct ceph_mds_client *mdsc,
unsigned long duration =
le32_to_cpu(h->duration_ms) * HZ / 1000;
- di->lease_seq = le32_to_cpu(h->seq);
+ di->lease_seq = seq;
dentry->d_time = di->lease_renew_from + duration;
di->lease_renew_after = di->lease_renew_from +
(duration >> 1);
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