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Btrfs: fix possible stale data exposure 

We specifically do not update the disk i_size if there are ordered extents
outstanding for any area between the current disk_i_size and our ordered
extent so that we do not expose stale data.  The problem is the check we
have only checks if the ordered extent starts at or after the current
disk_i_size, which doesn't take into account an ordered extent that starts
before the current disk_i_size and ends past the disk_i_size.  Fix this by
checking if the extent ends past the disk_i_size.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-01-30 14:31:31 -05:00
parent 5d1f40202b
commit 59fe4f4197
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ordered-data.c
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@ -877,7 +877,7 @@ int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
break;
if (test->file_offset >= i_size)
break;
if (test->file_offset >= disk_i_size) {
if (entry_end(test) > disk_i_size) {
/*
* we don't update disk_i_size now, so record this
* undealt i_size. Or we will not know the real