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[4/9] ceph: fix cap release race

Message ID 1370315998-10418-5-git-send-email-zheng.z.yan@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Yan, Zheng June 4, 2013, 3:19 a.m. UTC 
From: "Yan, Zheng" <zheng.z.yan@intel.com>

ceph_encode_inode_release() can race with ceph_open() and release
caps wanted by open files. So it should call __ceph_caps_wanted()
to get the wanted caps.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
---
 fs/ceph/caps.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)
diff mbox

Patch

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index da0f9b8..54c290b 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3042,21 +3042,19 @@  int ceph_encode_inode_release(void **p, struct inode *inode,
 		     (cap->issued & unless) == 0)) {
 			if ((cap->issued & drop) &&
 			    (cap->issued & unless) == 0) {
-				dout("encode_inode_release %p cap %p %s -> "
-				     "%s\n", inode, cap,
+				int wanted = __ceph_caps_wanted(ci);
+				if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
+					wanted |= cap->mds_wanted;
+				dout("encode_inode_release %p cap %p "
+				     "%s -> %s, wanted %s -> %s\n", inode, cap,
 				     ceph_cap_string(cap->issued),
-				     ceph_cap_string(cap->issued & ~drop));
+				     ceph_cap_string(cap->issued & ~drop),
+				     ceph_cap_string(cap->mds_wanted),
+				     ceph_cap_string(wanted));
+
 				cap->issued &= ~drop;
 				cap->implemented &= ~drop;
-				if (ci->i_ceph_flags & CEPH_I_NODELAY) {
-					int wanted = __ceph_caps_wanted(ci);
-					dout("  wanted %s -> %s (act %s)\n",
-					     ceph_cap_string(cap->mds_wanted),
-					     ceph_cap_string(cap->mds_wanted &
-							     ~wanted),
-					     ceph_cap_string(wanted));
-					cap->mds_wanted &= wanted;
-				}
+				cap->mds_wanted = wanted;
 			} else {
 				dout("encode_inode_release %p cap %p %s"
 				     " (force)\n", inode, cap,