Btrfs: Add back file data checksumming

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

6 files changed, 26 insertions, 19 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3878772fcffd..5accced2858a 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -594,6 +594,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
         tree_root->nodesize = nodesize;
         tree_root->leafsize = leafsize;
         tree_root->sectorsize = sectorsize;
+        sb_set_blocksize(sb, sectorsize);
 
         i_size_write(fs_info->btree_inode,
                      btrfs_super_total_bytes(disk_super));
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 190b07bc642b..33d2ccfd74d8 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -58,4 +58,6 @@ int btrfs_buffer_defrag_done(struct extent_buffer *buf);
 int btrfs_clear_buffer_defrag(struct extent_buffer *buf);
 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf);
 int btrfs_read_buffer(struct extent_buffer *buf);
+u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
+void btrfs_csum_final(u32 crc, char *result);
 #endif
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 2a8bc4bd43a9..e87e476dca92 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -2031,6 +2031,7 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
                 i = 1;
                 index++;
                 page_cache_get(page0);
+                mark_page_accessed(page0);
                 set_page_extent_mapped(page0);
                 set_page_private(page0, EXTENT_PAGE_PRIVATE_FIRST_PAGE |
                                  len << 2);
@@ -2049,6 +2050,7 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
                         goto fail;
                 }
                 set_page_extent_mapped(p);
+                mark_page_accessed(p);
                 if (i == 0) {
                         eb->first_page = p;
                         set_page_private(p, EXTENT_PAGE_PRIVATE_FIRST_PAGE |
@@ -2099,6 +2101,7 @@ struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
                         goto fail;
                 }
                 set_page_extent_mapped(p);
+                mark_page_accessed(p);
 
                 if (i == 0) {
                         eb->first_page = p;
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 9a65e97a4e28..10a4c7408600 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -136,27 +136,27 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
                           u64 objectid, u64 offset,
                           char *data, size_t len)
 {
-        return 0;
-#if 0
         int ret;
         struct btrfs_key file_key;
         struct btrfs_key found_key;
         struct btrfs_path *path;
         struct btrfs_csum_item *item;
-        struct extent_buffer *leaf;
+        struct extent_buffer *leaf = NULL;
         u64 csum_offset;
+        u32 csum_result = ~(u32)0;
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
 
         file_key.objectid = objectid;
         file_key.offset = offset;
-        file_key.flags = 0;
         btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
 
         item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1);
-        if (!IS_ERR(item))
+        if (!IS_ERR(item)) {
+                leaf = path->nodes[0];
                 goto found;
+        }
         ret = PTR_ERR(item);
         if (ret == -EFBIG) {
                 u32 item_size;
@@ -226,14 +226,15 @@ csum:
         item = (struct btrfs_csum_item *)((unsigned char *)item +
                                           csum_offset * BTRFS_CRC32_SIZE);
 found:
-        /* FIXME!!!!!!!!!!!! */
-        ret = btrfs_csum_data(root, data, len, &item->csum);
+        csum_result = btrfs_csum_data(root, data, csum_result, len);
+        btrfs_csum_final(csum_result, (char *)&csum_result);
+        write_extent_buffer(leaf, &csum_result, (unsigned long)item,
+                            BTRFS_CRC32_SIZE);
         btrfs_mark_buffer_dirty(path->nodes[0]);
 fail:
         btrfs_release_path(root, path);
         btrfs_free_path(path);
         return ret;
-#endif
 }
 
 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index fe28404ae7f4..1af2b6534dad 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -289,6 +289,7 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
          */
         inline_size = end_pos;
         if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
+            inline_size > 16384 ||
             inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
                 u64 last_end;
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 80f84b48a70f..ac69f6926afc 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -135,7 +135,7 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
         struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
         struct btrfs_csum_item *item;
         struct btrfs_path *path = NULL;
-        u64 private;
+        u32 csum;
 
         mutex_lock(&root->fs_info->fs_mutex);
         path = btrfs_alloc_path();
@@ -145,11 +145,12 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
                 /* a csum that isn't present is a preallocated region. */
                 if (ret == -ENOENT || ret == -EFBIG)
                         ret = 0;
-                private = 0;
+                csum = 0;
                 goto out;
         }
-        memcpy((char *)&private, &item->csum, BTRFS_CRC32_SIZE);
-        set_state_private(em_tree, start, private);
+        read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
+                           BTRFS_CRC32_SIZE);
+        set_state_private(em_tree, start, csum);
 out:
         if (path)
                 btrfs_free_path(path);
@@ -165,21 +166,19 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
         char *kaddr;
         u64 private;
         int ret;
+        struct btrfs_root *root = BTRFS_I(inode)->root;
+        u32 csum = ~(u32)0;
 
         ret = get_state_private(em_tree, start, &private);
         kaddr = kmap_atomic(page, KM_IRQ0);
         if (ret) {
                 goto zeroit;
         }
-        /*
-        struct btrfs_root *root = BTRFS_I(inode)->root;
-        char csum[BTRFS_CRC32_SIZE];
-        ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum);
-        BUG_ON(ret);
-        if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) {
+        csum = btrfs_csum_data(root, kaddr + offset, csum,  end - start + 1);
+        btrfs_csum_final(csum, (char *)&csum);
+        if (csum != private) {
                 goto zeroit;
         }
-        */
         kunmap_atomic(kaddr, KM_IRQ0);
         return 0;