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authorTheodore Ts'o <tytso@mit.edu>2011-10-31 15:56:32 +0100
committerTheodore Ts'o <tytso@mit.edu>2011-10-31 15:56:32 +0100
commitb82e384c7bb9a19036b4daf58fa216df7cd48aa0 (patch)
tree42bde122000b3bf3adf7eaa0328e0fdafdb3b5fd /fs/ext4/ext4.h
parentext4: remove unnecessary call to waitqueue_active() (diff)
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ext4: optimize locking for end_io extent conversion
Now that we are doing the locking correctly, we need to grab the i_completed_io_lock() twice per end_io. We can clean this up by removing the structure from the i_complted_io_list, and use this as the locking mechanism to prevent ext4_flush_completed_IO() racing against ext4_end_io_work(), instead of clearing the EXT4_IO_END_UNWRITTEN in io->flag. In addition, if the ext4_convert_unwritten_extents() returns an error, we no longer keep the end_io structure on the linked list. This doesn't help, because it tends to lock up the file system and wedges the system. That's one way to call attention to the problem, but it doesn't help the overall robustness of the system. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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