| Message ID | 1434661803-31188-2-git-send-email-mfasheh@suse.de (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
On Thu, Jun 18, 2015 at 02:10:02PM -0700, Mark Fasheh wrote: > In the case that we dedupe the tail of a file, we might expand the dedupe > len out to the end of our last block. We don't want to compare data past > i_size however, so pass the original length to btrfs_cmp_data(). > > Signed-off-by: Mark Fasheh <mfasheh@suse.de> Reviewed-by: David Sterba <dsterba@suse.cz> -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 2d24ff4..2deea1f 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2933,7 +2933,8 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, goto out_unlock; } - ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); + /* pass original length for comparison so we stay within i_size */ + ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen); if (ret == 0) ret = btrfs_clone(src, dst, loff, olen, len, dst_loff);
In the case that we dedupe the tail of a file, we might expand the dedupe len out to the end of our last block. We don't want to compare data past i_size however, so pass the original length to btrfs_cmp_data(). Signed-off-by: Mark Fasheh <mfasheh@suse.de> --- fs/btrfs/ioctl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)