Btrfs: add support for multiple csum algorithms
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>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index caea9ee..b4da53d5 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -714,7 +714,8 @@
u64 len = olen;
u64 bs = root->fs_info->sb->s_blocksize;
u64 hint_byte;
-
+ u16 csum_size =
+ btrfs_super_csum_size(&root->fs_info->super_copy);
/*
* TODO:
* - split compressed inline extents. annoying: we need to
@@ -964,7 +965,7 @@
int coff, clen;
size = btrfs_item_size_nr(leaf, slot);
- coverslen = (size / BTRFS_CRC32_SIZE) <<
+ coverslen = (size / csum_size) <<
root->fs_info->sb->s_blocksize_bits;
printk("csums for %llu~%llu\n",
key.offset, coverslen);
@@ -981,12 +982,12 @@
if (off > key.offset)
coff = ((off - key.offset) >>
root->fs_info->sb->s_blocksize_bits) *
- BTRFS_CRC32_SIZE;
+ csum_size;
clen = size - coff;
if (key.offset + coverslen > off+len)
clen -= ((key.offset+coverslen-off-len) >>
root->fs_info->sb->s_blocksize_bits) *
- BTRFS_CRC32_SIZE;
+ csum_size;
printk(" will dup %d~%d of %d\n",
coff, clen, size);