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| author | Yan, Zheng <zheng.z.yan@intel.com> | 2013-04-12 16:11:10 +0800 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2013-05-01 21:18:53 -0700 |
| commit | 37505d5768b9389a5ef7bc1efa465d4484a5462e (patch) | |
| tree | 208daa8785fe4847061a1dafee58ff32b5b861e6 /fs/ceph/file.c | |
| parent | 26be88087ae8a04a5b576aa2f490597b649fc132 (diff) | |
| download | linux-37505d5768b9389a5ef7bc1efa465d4484a5462e.tar.bz2 | |
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>
Diffstat (limited to 'fs/ceph/file.c')
| -rw-r--r-- | fs/ceph/file.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c index a65acf355384..dd44f3593992 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)); |