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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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10
fs/btrfs/tree-log.c
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@@ -929,13 +929,15 @@ static noinline int replay_one_csum(struct btrfs_trans_handle *trans,
int ret;
u32 item_size = btrfs_item_size_nr(eb, slot);
u64 cur_offset;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
unsigned long file_bytes;
struct btrfs_ordered_sum *sums;
struct btrfs_sector_sum *sector_sum;
struct inode *inode;
unsigned long ptr;
file_bytes = (item_size / BTRFS_CRC32_SIZE) * root->sectorsize;
file_bytes = (item_size / csum_size) * root->sectorsize;
inode = read_one_inode(root, key->objectid);
if (!inode) {
return -EIO;
@@ -959,10 +961,10 @@ static noinline int replay_one_csum(struct btrfs_trans_handle *trans,
ptr = btrfs_item_ptr_offset(eb, slot);
while(item_size > 0) {
sector_sum->offset = cur_offset;
read_extent_buffer(eb, &sector_sum->sum, ptr, BTRFS_CRC32_SIZE);
read_extent_buffer(eb, &sector_sum->sum, ptr, csum_size);
sector_sum++;
item_size -= BTRFS_CRC32_SIZE;
ptr += BTRFS_CRC32_SIZE;
item_size -= csum_size;
ptr += csum_size;
cur_offset += root->sectorsize;
}