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ext4: serialize dio nonlocked reads with defrag workers

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Inode's block defrag and ext4_change_inode_journal_flag() may
affect nonlocked DIO reads result, so proper synchronization
required.

- Add missed inode_dio_wait() calls where appropriate
- Check inode state under extra i_dio_count reference.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Dmitry Monakhov
2012-09-29 00:41:21 -04:00
committed by Theodore Ts'o
parent 28a535f9a0
commit 17335dcc47
4 changed files with 44 additions and 0 deletions
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5
fs/ext4/inode.c
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@@ -4720,6 +4720,10 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
return err;
}
/* Wait for all existing dio workers */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
jbd2_journal_lock_updates(journal);
/*
@@ -4739,6 +4743,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
ext4_set_aops(inode);
jbd2_journal_unlock_updates(journal);
ext4_inode_resume_unlocked_dio(inode);
/* Finally we can mark the inode as dirty. */