Btrfs: add generation field to file extent

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a4ad39b..c3fa12a 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -192,6 +192,7 @@ struct btrfs_root_item {
 } __attribute__ ((__packed__));
 
 struct btrfs_file_extent_item {
+       __le64 generation;
        /*
         * disk space consumed by the extent, checksum blocks are included
         * in these numbers
@@ -764,6 +765,18 @@ static inline void btrfs_set_file_extent_disk_blocknr(struct
        e->disk_blocknr = cpu_to_le64(val);
 }
 
+static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
+{
+       return le64_to_cpu(e->generation);
+}
+
+static inline void btrfs_set_file_extent_generation(struct
+                                                   btrfs_file_extent_item *e,
+                                                   u64 val)
+{
+       e->generation = cpu_to_le64(val);
+}
+
 static inline u64 btrfs_file_extent_disk_num_blocks(struct
                                                    btrfs_file_extent_item *e)
 {

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 4a0367d..09de270 100644 (file)
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -32,6 +32,7 @@ int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
        btrfs_set_file_extent_disk_num_blocks(item, ins.offset);
        btrfs_set_file_extent_offset(item, 0);
        btrfs_set_file_extent_num_blocks(item, ins.offset);
+       btrfs_set_file_extent_generation(item, trans->transid);
        mark_buffer_dirty(path.nodes[0]);
        *result = ins.objectid;
        btrfs_release_path(root, &path);