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: Peng Tao <bergwolf@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -871,6 +871,7 @@ out:
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if (PageLocked(page))
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unlock_page(page);
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page_cache_release(page);
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ext4_journal_stop(handle);
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}
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out2:
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ext4_journal_stop(handle);
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