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authorYan, Zheng <zheng.z.yan@intel.com>2013-04-12 16:11:10 +0800
committerSage Weil <sage@inktank.com>2013-05-01 21:18:53 -0700
commit37505d5768b9389a5ef7bc1efa465d4484a5462e (patch)
tree208daa8785fe4847061a1dafee58ff32b5b861e6
parent26be88087ae8a04a5b576aa2f490597b649fc132 (diff)
ceph: take i_mutex before getting Fw cap
There is deadlock as illustrated bellow. The fix is taking i_mutex before getting Fw cap reference. write truncate MDS --------------------- -------------------- -------------- get Fw cap lock i_mutex lock i_mutex (blocked) request setattr.size -> <- revoke Fw cap Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
-rw-r--r--fs/ceph/caps.c13
-rw-r--r--fs/ceph/file.c12
2 files changed, 13 insertions, 12 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index f9563108d18..da0f9b8a3bc 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2052,6 +2052,13 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
goto out;
}
+ /* finish pending truncate */
+ while (ci->i_truncate_pending) {
+ spin_unlock(&ci->i_ceph_lock);
+ __ceph_do_pending_vmtruncate(inode, !(need & CEPH_CAP_FILE_WR));
+ spin_lock(&ci->i_ceph_lock);
+ }
+
if (need & CEPH_CAP_FILE_WR) {
if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
@@ -2073,12 +2080,6 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
}
have = __ceph_caps_issued(ci, &implemented);
- /*
- * disallow writes while a truncate is pending
- */
- if (ci->i_truncate_pending)
- have &= ~CEPH_CAP_FILE_WR;
-
if ((have & need) == need) {
/*
* Look at (implemented & ~have & not) so that we keep waiting
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index a65acf35538..dd44f359399 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -651,7 +651,6 @@ static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
inode, ceph_vinop(inode), pos, (unsigned)len, inode);
again:
- __ceph_do_pending_vmtruncate(inode, true);
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
else
@@ -728,7 +727,7 @@ retry_snap:
ret = -ENOSPC;
goto out;
}
- __ceph_do_pending_vmtruncate(inode, true);
+ mutex_lock(&inode->i_mutex);
dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
inode->i_size);
@@ -737,8 +736,10 @@ retry_snap:
else
want = CEPH_CAP_FILE_BUFFER;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
- if (ret < 0)
- goto out_put;
+ if (ret < 0) {
+ mutex_unlock(&inode->i_mutex);
+ goto out;
+ }
dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
@@ -748,10 +749,10 @@ retry_snap:
(iocb->ki_filp->f_flags & O_DIRECT) ||
(inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
(fi->flags & CEPH_F_SYNC)) {
+ mutex_unlock(&inode->i_mutex);
ret = ceph_sync_write(file, iov->iov_base, iov->iov_len,
&iocb->ki_pos);
} else {
- mutex_lock(&inode->i_mutex);
ret = __generic_file_aio_write(iocb, iov, nr_segs,
&iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
@@ -766,7 +767,6 @@ retry_snap:
__mark_inode_dirty(inode, dirty);
}
-out_put:
dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
ceph_cap_string(got));