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authorYan, Zheng <zyan@redhat.com>2014-09-17 07:45:12 +0800
committerIlya Dryomov <idryomov@redhat.com>2014-10-14 21:03:39 +0400
commit6cd3bcad0d269f96667ea704d4f6459a5c6ccbab (patch)
treeb1b9f47e26f0553902803e7e58d23a0a3d3b5b0b /fs
parent508b32d8661b12da4c9ca41a9b2054e1dc92fa7e (diff)
ceph: move ceph_find_inode() outside the s_mutex
ceph_find_inode() may wait on freeing inode, using it inside the s_mutex may cause deadlock. (the freeing inode is waiting for OSD read reply, but dispatch thread is blocked by the s_mutex) Signed-off-by: Yan, Zheng <zyan@redhat.com> Reviewed-by: Sage Weil <sage@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ceph/caps.c11
-rw-r--r--fs/ceph/mds_client.c7
2 files changed, 10 insertions, 8 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 6d1cd45dca89..b3b0a913589f 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3045,6 +3045,12 @@ void ceph_handle_caps(struct ceph_mds_session *session,
}
}
+ /* lookup ino */
+ inode = ceph_find_inode(sb, vino);
+ ci = ceph_inode(inode);
+ dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
+ vino.snap, inode);
+
mutex_lock(&session->s_mutex);
session->s_seq++;
dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
@@ -3053,11 +3059,6 @@ void ceph_handle_caps(struct ceph_mds_session *session,
if (op == CEPH_CAP_OP_IMPORT)
ceph_add_cap_releases(mdsc, session);
- /* lookup ino */
- inode = ceph_find_inode(sb, vino);
- ci = ceph_inode(inode);
- dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
- vino.snap, inode);
if (!inode) {
dout(" i don't have ino %llx\n", vino.ino);
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index a17fc49c9948..5edf206354b2 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2944,14 +2944,15 @@ static void handle_lease(struct ceph_mds_client *mdsc,
if (dname.len != get_unaligned_le32(h+1))
goto bad;
- mutex_lock(&session->s_mutex);
- session->s_seq++;
-
/* lookup inode */
inode = ceph_find_inode(sb, vino);
dout("handle_lease %s, ino %llx %p %.*s\n",
ceph_lease_op_name(h->action), vino.ino, inode,
dname.len, dname.name);
+
+ mutex_lock(&session->s_mutex);
+ session->s_seq++;
+
if (inode == NULL) {
dout("handle_lease no inode %llx\n", vino.ino);
goto release;

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