Btrfs: early work to file_write in big extents

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

1 files changed, 15 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ef3583cf74d6..796f19d03ab5 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -227,6 +227,7 @@ struct btrfs_file_extent_item {
 } __attribute__ ((__packed__));
 
 struct btrfs_csum_item {
+        __le64 extent_offset;
         u8 csum[BTRFS_CSUM_SIZE];
 } __attribute__ ((__packed__));
 
@@ -924,6 +925,17 @@ static inline void btrfs_set_file_extent_num_blocks(struct
         e->num_blocks = cpu_to_le64(val);
 }
 
+static inline u64 btrfs_csum_extent_offset(struct btrfs_csum_item *c)
+{
+        return le64_to_cpu(c->extent_offset);
+}
+
+static inline void btrfs_set_csum_extent_offset(struct btrfs_csum_item *c,
+                                                u64 val)
+{
+        c->extent_offset = cpu_to_le64(val);
+}
+
 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
 {
         return le16_to_cpu(d->pathlen);
@@ -1002,6 +1014,8 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
                                btrfs_root *root);
 /* ctree.c */
+int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
+                      *root, struct btrfs_path *path, u32 data_size);
 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
                       *root, struct btrfs_key *key, struct btrfs_path *p, int
                       ins_len, int cow);
@@ -1071,6 +1085,7 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
                           struct btrfs_root *root,
                           u64 objectid, u64 offset,
+                          u64 extent_offset,
                           char *data, size_t len);
 int btrfs_csum_verify_file_block(struct btrfs_root *root,
                                  u64 objectid, u64 offset,