diff options
| author | Yan, Zheng <zheng.z.yan@intel.com> | 2013-10-31 16:44:14 +0800 |
|---|---|---|
| committer | Yan, Zheng <zheng.z.yan@intel.com> | 2014-01-21 13:29:32 +0800 |
| commit | 4fe59789adc93b2573b0417ac93136805521902e (patch) | |
| tree | eab5cc55b2785c1617ba21478a82f47dd2663ad4 /fs/ceph/caps.c | |
| parent | fc12c80aa57ee90385dc90e4263ec1a66200ba76 (diff) | |
ceph: handle cap export race in try_flush_caps()
auth cap may change after releasing the i_ceph_lock
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Diffstat (limited to 'fs/ceph/caps.c')
| -rw-r--r-- | fs/ceph/caps.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 80dad0d491a3..101209930d5c 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -1735,13 +1735,12 @@ ack: /* * Try to flush dirty caps back to the auth mds. */ -static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session, - unsigned *flush_tid) +static int try_flush_caps(struct inode *inode, unsigned *flush_tid) { struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; struct ceph_inode_info *ci = ceph_inode(inode); - int unlock_session = session ? 0 : 1; int flushing = 0; + struct ceph_mds_session *session = NULL; retry: spin_lock(&ci->i_ceph_lock); @@ -1755,13 +1754,14 @@ retry: int want = __ceph_caps_wanted(ci); int delayed; - if (!session) { + if (!session || session != cap->session) { spin_unlock(&ci->i_ceph_lock); + if (session) + mutex_unlock(&session->s_mutex); session = cap->session; mutex_lock(&session->s_mutex); goto retry; } - BUG_ON(session != cap->session); if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) goto out; @@ -1780,7 +1780,7 @@ retry: out: spin_unlock(&ci->i_ceph_lock); out_unlocked: - if (session && unlock_session) + if (session) mutex_unlock(&session->s_mutex); return flushing; } @@ -1865,7 +1865,7 @@ int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync) return ret; mutex_lock(&inode->i_mutex); - dirty = try_flush_caps(inode, NULL, &flush_tid); + dirty = try_flush_caps(inode, &flush_tid); dout("fsync dirty caps are %s\n", ceph_cap_string(dirty)); /* @@ -1900,7 +1900,7 @@ int ceph_write_inode(struct inode *inode, struct writeback_control *wbc) dout("write_inode %p wait=%d\n", inode, wait); if (wait) { - dirty = try_flush_caps(inode, NULL, &flush_tid); + dirty = try_flush_caps(inode, &flush_tid); if (dirty) err = wait_event_interruptible(ci->i_cap_wq, caps_are_flushed(inode, flush_tid)); |