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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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21
fs/btrfs/inode.c
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@ -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;