btrfs: grab fs_info from extent_buffer in btrfs_mark_buffer_dirty

Since commit f28491e0a6c4 ("Btrfs: move the extent buffer radix tree into
the fs_info"), fs_info can be grabbed from extent_buffer directly.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 212806d59012da7d8bbf1a11a0c6d14f006f92f5..abc929a47d4b814ebbd5969409df5d608440ee77 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4187,8 +4187,7 @@ int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
 
 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
 {
-       struct btrfs_fs_info *fs_info;
-       struct btrfs_root *root;
+       struct btrfs_fs_info *fs_info = buf->fs_info;
        u64 transid = btrfs_header_generation(buf);
        int was_dirty;
 
@@ -4201,8 +4200,6 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
        if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
                return;
 #endif
-       root = BTRFS_I(buf->pages[0]->mapping->host)->root;
-       fs_info = root->fs_info;
        btrfs_assert_tree_locked(buf);
        if (transid != fs_info->generation)
                WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",