Hi Liu,

FYI, there are new compile warnings show up in

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git master
head:   6a47d2266699f2d7903d26f178ed135dd9a109cf
commit: 434728b4678badfad6e8a35df26034a081014254 [66/68] Btrfs: snapshot-aware defrag
config: x86_64-randconfig-s345 (attached as .config)

All error/warnings:

fs/btrfs/inode.c: In function 'relink_extent_backref':
fs/btrfs/inode.c:2185:6: warning: passing argument 2 of 'btrfs_drop_extents' from incompatible pointer type [enabled by default]
In file included from fs/btrfs/inode.c:43:0:
fs/btrfs/ctree.h:3340:5: note: expected 'struct btrfs_root *' but argument is of type 'struct inode *'
fs/btrfs/inode.c:2185:6: warning: passing argument 3 of 'btrfs_drop_extents' makes pointer from integer without a cast [enabled by default]
In file included from fs/btrfs/inode.c:43:0:
fs/btrfs/ctree.h:3340:5: note: expected 'struct inode *' but argument is of type 'u64'
fs/btrfs/inode.c:2185:6: warning: passing argument 5 of 'btrfs_drop_extents' makes integer from pointer without a cast [enabled by default]
In file included from fs/btrfs/inode.c:43:0:
fs/btrfs/ctree.h:3340:5: note: expected 'u64' but argument is of type 'u64 *'

vim +2185 fs/btrfs/inode.c
  2175		start = backref->file_pos;
  2176		if (backref->extent_offset < old->extent_offset + old->offset)
  2177			start += old->extent_offset + old->offset -
  2178				 backref->extent_offset;
  2179	
  2180		len = min(backref->extent_offset + backref->num_bytes,
  2181			  old->extent_offset + old->offset + old->len);
  2182		len -= max(backref->extent_offset, old->extent_offset + old->offset);
  2183	
  2184		ret = btrfs_drop_extents(trans, inode, start,
> 2185					 start + len, &hint_byte, 1);
  2186		if (ret)
  2187			goto out_free_path;
  2188	again:
  2189		key.objectid = btrfs_ino(inode);
  2190		key.type = BTRFS_EXTENT_DATA_KEY;
  2191		key.offset = start;
  2192	
  2193		if (merge) {
  2194			struct btrfs_file_extent_item *fi;
  2195			u64 extent_len;

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0-DAY kernel build testing backend         Open Source Technology Centre
Fengguang Wu, Yuanhan Liu                              Intel Corporation