1 files changed, 74 insertions, 1 deletions

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 6dbe88b9d7d4..f4d3fa71bc41 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -31,7 +31,8 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
                              struct btrfs_root *root,
                              u64 objectid, u64 pos,
                              u64 disk_offset, u64 disk_num_bytes,
-                             u64 num_bytes, u64 offset)
+                             u64 num_bytes, u64 offset, u64 ram_bytes,
+                             u8 compression, u8 encryption, u16 other_encoding)
 {
         int ret = 0;
         struct btrfs_file_extent_item *item;
@@ -57,8 +58,13 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
         btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
         btrfs_set_file_extent_offset(leaf, item, offset);
         btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
+        btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
         btrfs_set_file_extent_generation(leaf, item, trans->transid);
         btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
+        btrfs_set_file_extent_compression(leaf, item, compression);
+        btrfs_set_file_extent_encryption(leaf, item, encryption);
+        btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
+
         btrfs_mark_buffer_dirty(leaf);
 out:
         btrfs_free_path(path);
@@ -213,6 +219,73 @@ found:
         return 0;
 }
 
+int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
+                          u64 start, unsigned long len)
+{
+        struct btrfs_ordered_sum *sums;
+        struct btrfs_sector_sum *sector_sum;
+        struct btrfs_ordered_extent *ordered;
+        char *data;
+        struct page *page;
+        unsigned long total_bytes = 0;
+        unsigned long this_sum_bytes = 0;
+
+        sums = kzalloc(btrfs_ordered_sum_size(root, len), GFP_NOFS);
+        if (!sums)
+                return -ENOMEM;
+
+        sector_sum = sums->sums;
+        sums->file_offset = start;
+        sums->len = len;
+        INIT_LIST_HEAD(&sums->list);
+        ordered = btrfs_lookup_ordered_extent(inode, sums->file_offset);
+        BUG_ON(!ordered);
+
+        while(len > 0) {
+                if (start >= ordered->file_offset + ordered->len ||
+                    start < ordered->file_offset) {
+                        sums->len = this_sum_bytes;
+                        this_sum_bytes = 0;
+                        btrfs_add_ordered_sum(inode, ordered, sums);
+                        btrfs_put_ordered_extent(ordered);
+
+                        sums = kzalloc(btrfs_ordered_sum_size(root, len),
+                                       GFP_NOFS);
+                        BUG_ON(!sums);
+                        sector_sum = sums->sums;
+                        sums->len = len;
+                        sums->file_offset = start;
+                        ordered = btrfs_lookup_ordered_extent(inode,
+                                                      sums->file_offset);
+                        BUG_ON(!ordered);
+                }
+
+                page = find_get_page(inode->i_mapping,
+                                     start >> PAGE_CACHE_SHIFT);
+
+                data = kmap_atomic(page, KM_USER0);
+                sector_sum->sum = ~(u32)0;
+                sector_sum->sum = btrfs_csum_data(root, data, sector_sum->sum,
+                                                  PAGE_CACHE_SIZE);
+                kunmap_atomic(data, KM_USER0);
+                btrfs_csum_final(sector_sum->sum,
+                                 (char *)&sector_sum->sum);
+                sector_sum->offset = page_offset(page);
+                page_cache_release(page);
+
+                sector_sum++;
+                total_bytes += PAGE_CACHE_SIZE;
+                this_sum_bytes += PAGE_CACHE_SIZE;
+                start += PAGE_CACHE_SIZE;
+
+                WARN_ON(len < PAGE_CACHE_SIZE);
+                len -= PAGE_CACHE_SIZE;
+        }
+        btrfs_add_ordered_sum(inode, ordered, sums);
+        btrfs_put_ordered_extent(ordered);
+        return 0;
+}
+
 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
                        struct bio *bio)
 {