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Btrfs: add support for multiple csum algorithms

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This patch gives us the space we will need in order to have different csum
algorithims at some point in the future.  We save the csum algorithim type
in the superblock, and use those instead of define's.

Signed-off-by: Josef Bacik <jbacik@redhat.com>
This commit is contained in:
Josef Bacik 2008-12-02 07:17:45 -05:00 • committed by Chris Mason
parent c6e2bac1a5
commit 607d432da0
5 changed files with 81 additions and 38 deletions
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25
fs/btrfs/disk-io.c
View file

@ -176,7 +176,9 @@ void btrfs_csum_final(u32 crc, char *result)
static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify)
{
char result[BTRFS_CRC32_SIZE];
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
char *result = NULL;
unsigned long len;
unsigned long cur_len;
unsigned long offset = BTRFS_CSUM_SIZE;
@ -186,6 +188,7 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
unsigned long map_len;
int err;
u32 crc = ~(u32)0;
unsigned long inline_result;
len = buf->len - offset;
while(len > 0) {
@ -204,25 +207,37 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
offset += cur_len;
unmap_extent_buffer(buf, map_token, KM_USER0);
}
if (csum_size > sizeof(inline_result)) {
result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
if (!result)
return 1;
} else {
result = (char *)&inline_result;
}
btrfs_csum_final(crc, result);
if (verify) {
/* FIXME, this is not good */
if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
u32 val;
u32 found = 0;
memcpy(&found, result, BTRFS_CRC32_SIZE);
memcpy(&found, result, csum_size);
read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
read_extent_buffer(buf, &val, 0, csum_size);
printk("btrfs: %s checksum verify failed on %llu "
"wanted %X found %X level %d\n",
root->fs_info->sb->s_id,
buf->start, val, found, btrfs_header_level(buf));
if (result != (char *)&inline_result)
kfree(result);
return 1;
}
} else {
write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
write_extent_buffer(buf, result, 0, csum_size);
}
if (result != (char *)&inline_result)
kfree(result);
return 0;
}