Commit 91cc219a authored by Peng Tao's avatar Peng Tao Committed by Theodore Ts'o

ext4: fix journal ref count in move_extent_par_page

move_extent_par_page calls a_ops->write_begin() to increase journal
handler's reference count. However, if either mext_replace_branches()
or ext4_get_block fails, the increased reference count isn't
decreased. This will cause a later attempt to umount of the fs to hang
forever. The patch addresses the issue by calling ext4_journal_stop()
if page is not NULL (which means a_ops->write_end() isn't invoked).
Signed-off-by: default avatarPeng Tao <bergwolf@gmail.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent b1f485f2
...@@ -871,6 +871,7 @@ move_extent_par_page(struct file *o_filp, struct inode *donor_inode, ...@@ -871,6 +871,7 @@ move_extent_par_page(struct file *o_filp, struct inode *donor_inode,
if (PageLocked(page)) if (PageLocked(page))
unlock_page(page); unlock_page(page);
page_cache_release(page); page_cache_release(page);
ext4_journal_stop(handle);
} }
out2: out2:
ext4_journal_stop(handle); ext4_journal_stop(handle);
......
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