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Btrfs: Switch to libcrc32c to avoid problems with cryptomgr on highmem machines

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-06-22 14:16:24 -04:00
committed by David Woodhouse
parent e011599b0f
commit 11bd143fc8
3 changed files with 8 additions and 29 deletions
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30
fs/btrfs/disk-io.c
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@@ -19,7 +19,7 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/crypto.h>
#include <linux/crc32c.h>
#include <linux/scatterlist.h>
#include <linux/swap.h>
#include <linux/radix-tree.h>
@@ -147,22 +147,12 @@ static int btree_get_block(struct inode *inode, sector_t iblock,
int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
char *result)
{
struct scatterlist sg;
struct crypto_hash *tfm = root->fs_info->hash_tfm;
struct hash_desc desc;
int ret;
desc.tfm = tfm;
desc.flags = 0;
sg_init_one(&sg, data, len);
spin_lock_irq(&root->fs_info->hash_lock);
ret = crypto_hash_digest(&desc, &sg, 1, result);
spin_unlock_irq(&root->fs_info->hash_lock);
if (ret) {
printk("digest failed\n");
}
return ret;
u32 crc;
crc = crc32c(0, data, len);
memcpy(result, &crc, BTRFS_CRC32_SIZE);
return 0;
}
static int csum_tree_block(struct btrfs_root *root, struct buffer_head *bh,
int verify)
{
@@ -454,14 +444,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
sizeof(struct btrfs_key));
insert_inode_hash(fs_info->btree_inode);
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->hash_tfm = crypto_alloc_hash("crc32c", 0, CRYPTO_ALG_ASYNC);
spin_lock_init(&fs_info->hash_lock);
if (!fs_info->hash_tfm || IS_ERR(fs_info->hash_tfm)) {
printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
err = -ENOMEM;
goto fail_iput;
}
mutex_init(&fs_info->trans_mutex);
mutex_init(&fs_info->fs_mutex);
@@ -613,7 +596,6 @@ int close_ctree(struct btrfs_root *root)
btrfs_block_release(fs_info->tree_root,
fs_info->tree_root->node);
btrfs_block_release(root, fs_info->sb_buffer);
crypto_free_hash(fs_info->hash_tfm);
truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
iput(fs_info->btree_inode);