summaryrefslogtreecommitdiffstats
path: root/fs/ceph/caps.c
diff options
context:
space:
mode:
authorSage Weil <sage@newdream.net>2009-11-09 12:05:48 -0800
committerSage Weil <sage@newdream.net>2009-11-09 12:06:07 -0800
commit685f9a5d14194fc35db73e5e7370740ccc14b64a (patch)
tree4c34ac2348149d91ad5e08cd105207810f0afdc9 /fs/ceph/caps.c
parentfb690390e305ea51e1883b105c7d3c52d7100ba5 (diff)
downloadop-kernel-dev-685f9a5d14194fc35db73e5e7370740ccc14b64a.zip
op-kernel-dev-685f9a5d14194fc35db73e5e7370740ccc14b64a.tar.gz
ceph: do not confuse stale and dead (unreconnected) caps
We were using the cap_gen to track both stale caps (caps that timed out due to temporarily losing touch with the mds) and dead caps that did not reconnect after an MDS failure. Introduce a recon_gen counter to track reconnections to restarted MDSs and kill dead caps based on that instead. Rename gen to cap_gen while we're at it to make it more clear which is which. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/caps.c')
-rw-r--r--fs/ceph/caps.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 8b863db..775e6f6 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -609,7 +609,8 @@ retry:
cap->seq = seq;
cap->issue_seq = seq;
cap->mseq = mseq;
- cap->gen = session->s_cap_gen;
+ cap->cap_gen = session->s_cap_gen;
+ cap->recon_gen = session->s_recon_gen;
if (fmode >= 0)
__ceph_get_fmode(ci, fmode);
@@ -626,17 +627,25 @@ retry:
static int __cap_is_valid(struct ceph_cap *cap)
{
unsigned long ttl;
- u32 gen;
+ u32 gen, recon_gen;
spin_lock(&cap->session->s_cap_lock);
gen = cap->session->s_cap_gen;
+ recon_gen = cap->session->s_recon_gen;
ttl = cap->session->s_cap_ttl;
spin_unlock(&cap->session->s_cap_lock);
- if (cap->gen < gen || time_after_eq(jiffies, ttl)) {
+ if (cap->recon_gen != recon_gen) {
+ dout("__cap_is_valid %p cap %p issued %s "
+ "but DEAD (recon_gen %u vs %u)\n", &cap->ci->vfs_inode,
+ cap, ceph_cap_string(cap->issued), cap->recon_gen,
+ recon_gen);
+ return 0;
+ }
+ if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
dout("__cap_is_valid %p cap %p issued %s "
"but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
- cap, ceph_cap_string(cap->issued), cap->gen, gen);
+ cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
return 0;
}
@@ -2203,7 +2212,8 @@ restart:
issued = __ceph_caps_issued(ci, &implemented);
issued |= implemented | __ceph_caps_dirty(ci);
- cap->gen = session->s_cap_gen;
+ cap->cap_gen = session->s_cap_gen;
+ cap->recon_gen = session->s_recon_gen;
__check_cap_issue(ci, cap, newcaps);
OpenPOWER on IntegriCloud