[PATCH V14 15/15] Btrfs: subpagesize-blocksize: Enable dedup ioctl

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

The function implementing the dedup ioctl
i.e. btrfs_ioctl_file_extent_same(), returns with an error in
subpagesize-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 | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index b209415..ab47cfa 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3191,7 +3191,6 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
 	int i;
 	int ret;
 	unsigned long size;
-	u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
 	bool is_admin = capable(CAP_SYS_ADMIN);
 	u16 count;
 
@@ -3228,16 +3227,6 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
 	if (len > BTRFS_MAX_DEDUPE_LEN)
 		len = BTRFS_MAX_DEDUPE_LEN;
 
-	if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
-		/*
-		 * Btrfs does not support blocksize < page_size. As a
-		 * result, btrfs_cmp_data() won't correctly handle
-		 * this situation without an update.
-		 */
-		ret = -EINVAL;
-		goto out;
-	}
-
 	ret = -EISDIR;
 	if (S_ISDIR(src->i_mode))
 		goto out;
-- 
2.1.0