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authoralex chen <alex.chen@huawei.com>2017-11-15 17:31:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 18:21:01 -0800
commit28f5a8a7c033cbf3e32277f4cc9c6afd74f05300 (patch)
tree5844399023db9b0e2511d7c660c00af8b5fd6b7f
parent67b1b8d14aa08aa8df835377074ed629629bda50 (diff)
downloadlinux-28f5a8a7c033cbf3e32277f4cc9c6afd74f05300.tar.bz2
ocfs2: should wait dio before inode lock in ocfs2_setattr()
we should wait dio requests to finish before inode lock in ocfs2_setattr(), otherwise the following deadlock will happen: process 1 process 2 process 3 truncate file 'A' end_io of writing file 'A' receiving the bast messages ocfs2_setattr ocfs2_inode_lock_tracker ocfs2_inode_lock_full inode_dio_wait __inode_dio_wait -->waiting for all dio requests finish dlm_proxy_ast_handler dlm_do_local_bast ocfs2_blocking_ast ocfs2_generic_handle_bast set OCFS2_LOCK_BLOCKED flag dio_end_io dio_bio_end_aio dio_complete ocfs2_dio_end_io ocfs2_dio_end_io_write ocfs2_inode_lock __ocfs2_cluster_lock ocfs2_wait_for_mask -->waiting for OCFS2_LOCK_BLOCKED flag to be cleared, that is waiting for 'process 1' unlocking the inode lock inode_dio_end -->here dec the i_dio_count, but will never be called, so a deadlock happened. Link: http://lkml.kernel.org/r/59F81636.70508@huawei.com Signed-off-by: Alex Chen <alex.chen@huawei.com> Reviewed-by: Jun Piao <piaojun@huawei.com> Reviewed-by: Joseph Qi <jiangqi903@gmail.com> Acked-by: Changwei Ge <ge.changwei@h3c.com> Cc: Mark Fasheh <mfasheh@versity.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/ocfs2/file.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 6e41fc8fabbe..dc455d45a66a 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1161,6 +1161,13 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
}
size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
if (size_change) {
+ /*
+ * Here we should wait dio to finish before inode lock
+ * to avoid a deadlock between ocfs2_setattr() and
+ * ocfs2_dio_end_io_write()
+ */
+ inode_dio_wait(inode);
+
status = ocfs2_rw_lock(inode, 1);
if (status < 0) {
mlog_errno(status);
@@ -1200,8 +1207,6 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
if (status)
goto bail_unlock;
- inode_dio_wait(inode);
-
if (i_size_read(inode) >= attr->ia_size) {
if (ocfs2_should_order_data(inode)) {
status = ocfs2_begin_ordered_truncate(inode,