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ext4: wait for outstanding dio during truncate in nojournal mode

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We didn't wait for outstanding direct IO during truncate in nojournal
mode (as we skip orphan handling in that case). This can lead to fs
corruption or stale data exposure if truncate ends up freeing blocks
and these get reallocated before direct IO finishes. Fix the condition
determining whether the wait is necessary.

CC: stable@vger.kernel.org
Fixes: 1c9114f9c0 ("ext4: serialize unlocked dio reads with truncate")
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2019-05-23 23:07:08 -04:00 committed by Theodore Ts'o
parent 0a944e8a6c
commit 82a25b027c
1 changed files with 9 additions and 12 deletions
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21
fs/ext4/inode.c
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@ -5630,20 +5630,17 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
goto err_out;
}
}
if (!shrink)
if (!shrink) {
pagecache_isize_extended(inode, oldsize, inode->i_size);
/*
* Blocks are going to be removed from the inode. Wait
* for dio in flight. Temporarily disable
* dioread_nolock to prevent livelock.
*/
if (orphan) {
if (!ext4_should_journal_data(inode)) {
inode_dio_wait(inode);
} else
ext4_wait_for_tail_page_commit(inode);
} else {
/*
* Blocks are going to be removed from the inode. Wait
* for dio in flight.
*/
inode_dio_wait(inode);
}
if (orphan && ext4_should_journal_data(inode))
ext4_wait_for_tail_page_commit(inode);
down_write(&EXT4_I(inode)->i_mmap_sem);
rc = ext4_break_layouts(inode);