Btrfs: check the nodatasum flag when writing compressed files

If mounting with nodatasum option, we won't csum file data for
general write or direct-io write, and this rule should also be
applied when writing compressed files.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 10 insertions, 4 deletions

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index bfe42b03eaf9..8ec5d86f1734 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -338,6 +338,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
         u64 first_byte = disk_start;
         struct block_device *bdev;
         int ret;
+        int skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
 
         WARN_ON(start & ((u64)PAGE_CACHE_SIZE - 1));
         cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS);
@@ -392,8 +393,11 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
                         ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
                         BUG_ON(ret);
 
-                        ret = btrfs_csum_one_bio(root, inode, bio, start, 1);
-                        BUG_ON(ret);
+                        if (!skip_sum) {
+                                ret = btrfs_csum_one_bio(root, inode, bio,
+                                                         start, 1);
+                                BUG_ON(ret);
+                        }
 
                         ret = btrfs_map_bio(root, WRITE, bio, 0, 1);
                         BUG_ON(ret);
@@ -418,8 +422,10 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
         ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
         BUG_ON(ret);
 
-        ret = btrfs_csum_one_bio(root, inode, bio, start, 1);
-        BUG_ON(ret);
+        if (!skip_sum) {
+                ret = btrfs_csum_one_bio(root, inode, bio, start, 1);
+                BUG_ON(ret);
+        }
 
         ret = btrfs_map_bio(root, WRITE, bio, 0, 1);
         BUG_ON(ret);