diff options
| author |   Jan Kara <jack@suse.cz> | 2016-10-30 11:42:04 -0500 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2016-10-30 13:09:42 -0400 |
| commit | 70fe2f48152e60664809e2fed76bbb50c9fa2aa3 (patch) | |
| tree | c5797bacdc9175af6658c9548387b52749cda6ee /include/linux | |
| parent | fs: remove aio_run_iocb (diff) | |
| download | linux-dev-70fe2f48152e60664809e2fed76bbb50c9fa2aa3.tar.xz linux-dev-70fe2f48152e60664809e2fed76bbb50c9fa2aa3.zip | |
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 'include/linux')
| -rw-r--r-- | include/linux/fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index ff7bcd9e8398..dc0478c07b2a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -321,6 +321,7 @@ struct writeback_control; #define IOCB_HIPRI (1 << 3) #define IOCB_DSYNC (1 << 4) #define IOCB_SYNC (1 << 5) +#define IOCB_WRITE (1 << 6) struct kiocb { struct file *ki_filp; |