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ceph: fix cache revoke race

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handle following sequence of events:

- non-auth MDS revokes Fc cap. queue invalidate work
- auth MDS issues Fc cap through request reply. i_rdcache_gen gets
  increased.
- invalidate work runs. it finds i_rdcache_revoking != i_rdcache_gen,
  so it does nothing.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng
2013-11-22 13:50:45 +08:00
parent d1b87809fb
commit 9563f88c1f
3 changed files with 8 additions and 4 deletions
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8
fs/ceph/inode.c
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@@ -1466,7 +1466,8 @@ static void ceph_invalidate_work(struct work_struct *work)
dout("invalidate_pages %p gen %d revoking %d\n", inode,
ci->i_rdcache_gen, ci->i_rdcache_revoking);
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
/* nevermind! */
if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
check = 1;
spin_unlock(&ci->i_ceph_lock);
mutex_unlock(&ci->i_truncate_mutex);
goto out;
@@ -1487,13 +1488,14 @@ static void ceph_invalidate_work(struct work_struct *work)
dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
inode, orig_gen, ci->i_rdcache_gen,
ci->i_rdcache_revoking);
if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
check = 1;
}
spin_unlock(&ci->i_ceph_lock);
mutex_unlock(&ci->i_truncate_mutex);
out:
if (check)
ceph_check_caps(ci, 0, NULL);
out:
iput(inode);
}