From: Omar Sandoval <osandov@xxxxxx>
This makes us consistent with both reflink and the XFS implementation of
dedupe.
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
---
fs/btrfs/ioctl.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index e23f945..320fb35 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3121,21 +3121,25 @@ static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
struct inode *dst, u64 dst_loff)
{
- int ret;
- u64 len = olen;
+ int ret = 0;
+ u64 len;
struct cmp_pages cmp;
bool same_inode = (src == dst);
u64 same_lock_start = 0;
u64 same_lock_len = 0;
- if (len == 0)
- return 0;
-
if (same_inode)
inode_lock(src);
else
btrfs_double_inode_lock(src, dst);
+ if (olen == 0) {
+ olen = i_size_read(src) - loff;
+ if (olen == 0)
+ goto out_unlock;
+ }
+ len = olen;
+
ret = extent_same_check_offsets(src, loff, &len, olen);
if (ret)
goto out_unlock;
--
2.10.2
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