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Btrfs: Add back file data checksumming

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-10-15 16:22:25 -04:00
parent cf786e79e3
commit ff79f8190b
6 changed files with 26 additions and 19 deletions
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1
fs/btrfs/disk-io.c
View file

@ -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));

2
fs/btrfs/disk-io.h
View file

@ -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

3
fs/btrfs/extent_map.c
View file

@ -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;

17
fs/btrfs/file-item.c
View file

@ -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,

1
fs/btrfs/file.c
View file

@ -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;

21
fs/btrfs/inode.c
View file

@ -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;