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aio: fix freeze protection of aio writes

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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>
This commit is contained in:
Jan Kara 2016-10-30 11:42:04 -05:00 committed by Al Viro
parent 89319d31d2
commit 70fe2f4815
2 changed files with 19 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
fs/aio.c
View file

@ -1078,6 +1078,17 @@ static void aio_complete(struct kiocb *kiocb, long res, long res2)
unsigned tail, pos, head;
unsigned long flags;
if (kiocb->ki_flags & IOCB_WRITE) {
struct file *file = kiocb->ki_filp;
/*
* Tell lockdep we inherited freeze protection from submission
* thread.
*/
__sb_writers_acquired(file_inode(file)->i_sb, SB_FREEZE_WRITE);
file_end_write(file);
}
/*
* Special case handling for sync iocbs:
* - events go directly into the iocb for fast handling
@ -1473,9 +1484,15 @@ static ssize_t aio_write(struct kiocb *req, struct iocb *iocb, bool vectored,
return ret;
ret = rw_verify_area(WRITE, file, &req->ki_pos, iov_iter_count(&iter));
if (!ret) {
req->ki_flags |= IOCB_WRITE;
file_start_write(file);
ret = aio_ret(req, file->f_op->write_iter(req, &iter));
file_end_write(file);
/*
* We release freeze protection in aio_complete(). Fool lockdep
* by telling it the lock got released so that it doesn't
* complain about held lock when we return to userspace.
*/
__sb_writers_release(file_inode(file)->i_sb, SB_FREEZE_WRITE);
}
kfree(iovec);
return ret;

1
include/linux/fs.h
View file

@ -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;