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authorJan Kara <jack@suse.cz>2016-10-30 11:42:04 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2016-10-30 13:09:42 -0400
commit70fe2f48152e60664809e2fed76bbb50c9fa2aa3 (patch)
treec5797bacdc9175af6658c9548387b52749cda6ee /mm/filemap.c
parent89319d31d2d097da8e27fb0e0ae9d532f4f16827 (diff)
aio: fix freeze protection of aio writes
Currently we dropped freeze protection of aio writes just after IO was submitted. Thus aio write could be in flight while the filesystem was frozen and that could result in unexpected situation like aio completion wanting to convert extent type on frozen filesystem. Testcase from Dmitry triggering this is like: for ((i=0;i<60;i++));do fsfreeze -f /mnt ;sleep 1;fsfreeze -u /mnt;done & fio --bs=4k --ioengine=libaio --iodepth=128 --size=1g --direct=1 \ --runtime=60 --filename=/mnt/file --name=rand-write --rw=randwrite Fix the problem by dropping freeze protection only once IO is completed in aio_complete(). Reported-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jan Kara <jack@suse.cz> [hch: forward ported on top of various VFS and aio changes] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/filemap.c')
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