[PATCH V18 15/18] Btrfs: subpage-blocksize: Enable dedupe ioctl

[Chandan Rajendra <chandan@linux.vnet.ibm.com>]

The function implementing the dedupe ioctl
i.e. btrfs_ioctl_file_extent_same(), returns with an error in
subpage-blocksize scenario. This was done due to the fact that Btrfs did
not have code to deal with block size < page size. This commit removes
this restriction since we now support "block size < page size".

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
 fs/btrfs/ioctl.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index bf79dbc..4ff7cf8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3256,21 +3256,11 @@ ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
 {
 	struct inode *src = file_inode(src_file);
 	struct inode *dst = file_inode(dst_file);
-	u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
 	ssize_t res;
 
 	if (olen > BTRFS_MAX_DEDUPE_LEN)
 		olen = BTRFS_MAX_DEDUPE_LEN;
 
-	if (WARN_ON_ONCE(bs < PAGE_SIZE)) {
-		/*
-		 * Btrfs does not support blocksize < page_size. As a
-		 * result, btrfs_cmp_data() won't correctly handle
-		 * this situation without an update.
-		 */
-		return -EINVAL;
-	}
-
 	res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
 	if (res)
 		return res;
-- 
2.1.0