Btrfs: fix btrfsck error 400 when truncating a compressed

Reproduce steps:
 # mkfs.btrfs /dev/sdb5
 # mount /dev/sdb5 -o compress=lzo /mnt
 # dd if=/dev/zero of=/mnt/tmpfile bs=128K count=1
 # sync
 # truncate -s 64K /mnt/tmpfile
 root 5 inode 257 errors 400

This is because of the wrong if condition, which is used to check if we should
subtract the bytes of the dropped range from i_blocks/i_bytes of i-node or not.
When we truncate a compressed extent, btrfs substracts the bytes of the whole
extent, it's wrong. We should substract the real size that we truncate, no
matter it is a compressed extent or not. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5f8ba21..946a7f1 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3009,7 +3009,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
        int pending_del_nr = 0;
        int pending_del_slot = 0;
        int extent_type = -1;
-       int encoding;
        int ret;
        int err = 0;
        u64 ino = btrfs_ino(inode);
@@ -3059,7 +3058,6 @@ search_again:
                leaf = path->nodes[0];
                btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
                found_type = btrfs_key_type(&found_key);
-               encoding = 0;
 
                if (found_key.objectid != ino)
                        break;
@@ -3072,10 +3070,6 @@ search_again:
                        fi = btrfs_item_ptr(leaf, path->slots[0],
                                            struct btrfs_file_extent_item);
                        extent_type = btrfs_file_extent_type(leaf, fi);
-                       encoding = btrfs_file_extent_compression(leaf, fi);
-                       encoding |= btrfs_file_extent_encryption(leaf, fi);
-                       encoding |= btrfs_file_extent_other_encoding(leaf, fi);
-
                        if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
                                item_end +=
                                    btrfs_file_extent_num_bytes(leaf, fi);
@@ -3103,7 +3097,7 @@ search_again:
                if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
                        u64 num_dec;
                        extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
-                       if (!del_item && !encoding) {
+                       if (!del_item) {
                                u64 orig_num_bytes =
                                        btrfs_file_extent_num_bytes(leaf, fi);
                                extent_num_bytes = new_size -