ext4: fix unwritten counter leakage

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ext4_set_io_unwritten_flag() will increment i_unwritten counter, so
once we mark end_io with EXT4_END_IO_UNWRITTEN we have to revert it back
on error path.

 - add missed error checks to prevent counter leakage
 - ext4_end_io_nolock() will clear EXT4_END_IO_UNWRITTEN flag to signal
   that conversion finished.
 - add BUG_ON to ext4_free_end_io() to prevent similar leakage in future.

Visible effect of this bug is that unaligned aio_stress may deadlock

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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This commit is contained in:

Dmitry Monakhov 2012-09-28 23:36:25 -04:00 • committed by Theodore Ts'o

parent e27f41e1b7

commit 82e5422911

2 changed files with 19 additions and 8 deletions

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21

fs/ext4/extents.c

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6

fs/ext4/page-io.c

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