diff options
| -rw-r--r-- | fs/btrfs/Kconfig | 3 | ||||
| -rw-r--r-- | fs/btrfs/Makefile | 2 | ||||
| -rw-r--r-- | fs/btrfs/extent-tree.c | 6 | ||||
| -rw-r--r-- | fs/btrfs/hash.c | 50 | ||||
| -rw-r--r-- | fs/btrfs/hash.h | 11 | ||||
| -rw-r--r-- | fs/btrfs/super.c | 10 |
6 files changed, 73 insertions, 9 deletions
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig index aa976eced2d2..a66768ebc8d1 100644 --- a/fs/btrfs/Kconfig +++ b/fs/btrfs/Kconfig @@ -1,6 +1,7 @@ config BTRFS_FS tristate "Btrfs filesystem support" - select LIBCRC32C + select CRYPTO + select CRYPTO_CRC32C select ZLIB_INFLATE select ZLIB_DEFLATE select LZO_COMPRESS diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index af7f000e905c..f341a98031d2 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -9,7 +9,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ export.o tree-log.o free-space-cache.o zlib.o lzo.o \ compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \ reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \ - uuid-tree.o props.o + uuid-tree.o props.o hash.o btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index b5322596d60b..db1e32ffcfbb 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -1074,11 +1074,11 @@ static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) __le64 lenum; lenum = cpu_to_le64(root_objectid); - high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); + high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); lenum = cpu_to_le64(owner); - low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); + low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); lenum = cpu_to_le64(offset); - low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); + low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); return ((u64)high_crc << 31) ^ (u64)low_crc; } diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c new file mode 100644 index 000000000000..85889aa82c62 --- /dev/null +++ b/fs/btrfs/hash.c @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include <crypto/hash.h> +#include <linux/err.h> +#include "hash.h" + +static struct crypto_shash *tfm; + +int __init btrfs_hash_init(void) +{ + tfm = crypto_alloc_shash("crc32c", 0, 0); + if (IS_ERR(tfm)) + return PTR_ERR(tfm); + + return 0; +} + +void btrfs_hash_exit(void) +{ + crypto_free_shash(tfm); +} + +u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length) +{ + struct { + struct shash_desc shash; + char ctx[crypto_shash_descsize(tfm)]; + } desc; + int err; + + desc.shash.tfm = tfm; + desc.shash.flags = 0; + *(u32 *)desc.ctx = crc; + + err = crypto_shash_update(&desc.shash, address, length); + BUG_ON(err); + + return *(u32 *)desc.ctx; +} diff --git a/fs/btrfs/hash.h b/fs/btrfs/hash.h index 1d982812ab67..118a2316e5d3 100644 --- a/fs/btrfs/hash.h +++ b/fs/btrfs/hash.h @@ -19,10 +19,15 @@ #ifndef __HASH__ #define __HASH__ -#include <linux/crc32c.h> +int __init btrfs_hash_init(void); + +void btrfs_hash_exit(void); + +u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length); + static inline u64 btrfs_name_hash(const char *name, int len) { - return crc32c((u32)~1, name, len); + return btrfs_crc32c((u32)~1, name, len); } /* @@ -31,7 +36,7 @@ static inline u64 btrfs_name_hash(const char *name, int len) static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len) { - return (u64) crc32c(parent_objectid, name, len); + return (u64) btrfs_crc32c(parent_objectid, name, len); } #endif diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 461e41cb8ca7..f44cc6a0eb27 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -48,6 +48,7 @@ #include "transaction.h" #include "btrfs_inode.h" #include "print-tree.h" +#include "hash.h" #include "props.h" #include "xattr.h" #include "volumes.h" @@ -1866,11 +1867,15 @@ static int __init init_btrfs_fs(void) { int err; + err = btrfs_hash_init(); + if (err) + return err; + btrfs_props_init(); err = btrfs_init_sysfs(); if (err) - return err; + goto free_hash; btrfs_init_compress(); @@ -1945,6 +1950,8 @@ free_cachep: free_compress: btrfs_exit_compress(); btrfs_exit_sysfs(); +free_hash: + btrfs_hash_exit(); return err; } @@ -1963,6 +1970,7 @@ static void __exit exit_btrfs_fs(void) btrfs_exit_sysfs(); btrfs_cleanup_fs_uuids(); btrfs_exit_compress(); + btrfs_hash_exit(); } module_init(init_btrfs_fs) |
