btrfs: Remove custom crc32c init code

The custom crc32 init code was introduced in
14a958e678cd ("Btrfs: fix btrfs boot when compiled as built-in") to
enable using btrfs as a built-in. However, later as pointed out by
60efa5eb2e88 ("Btrfs: use late_initcall instead of module_init") this
wasn't enough and finally btrfs was switched to late_initcall which
comes after the generic crc32c implementation is initiliased. The
latter commit superseeded the former. Now that we don't have to
maintain our own code let's just remove it and switch to using the
generic implementation.

Despite touching a lot of files the patch is really simple. Here is the gist of
the changes:

1. Select LIBCRC32C rather than the low-level modules.
2. s/btrfs_crc32c/crc32c/g
3. replace hash.h with linux/crc32c.h
4. Move the btrfs namehash funcs to ctree.h and change the tree accordingly.

I've tested this with btrfs being both a module and a built-in and xfstest
doesn't complain.

Does seem to fix the longstanding problem of not automatically selectiong
the crc32c module when btrfs is used. Possibly there is a workaround in
dracut.

The modinfo confirms that now all the module dependencies are there:

before:
depends:        zstd_compress,zstd_decompress,raid6_pq,xor,zlib_deflate

after:
depends:        libcrc32c,zstd_compress,zstd_decompress,raid6_pq,xor,zlib_deflate

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add more info to changelog from mails ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 273351e..167e5dc 100644 (file)
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -1,7 +1,6 @@
 config BTRFS_FS
        tristate "Btrfs filesystem support"
-       select CRYPTO
-       select CRYPTO_CRC32C
+       select LIBCRC32C
        select ZLIB_INFLATE
        select ZLIB_DEFLATE
        select LZO_COMPRESS

diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 0c43736..ca693dd 100644 (file)
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -10,7 +10,7 @@ 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 zstd.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 hash.o free-space-tree.o tree-checker.o
+          uuid-tree.o props.o free-space-tree.o tree-checker.o
 
 btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
 btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 7d51b5a..3baebbc 100644 (file)
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -96,9 +96,9 @@
 #include <linux/blkdev.h>
 #include <linux/mm.h>
 #include <linux/string.h>
+#include <linux/crc32c.h>
 #include "ctree.h"
 #include "disk-io.h"
-#include "hash.h"
 #include "transaction.h"
 #include "extent_io.h"
 #include "volumes.h"
@@ -1736,7 +1736,7 @@ static int btrfsic_test_for_metadata(struct btrfsic_state *state,
                size_t sublen = i ? PAGE_SIZE :
                                    (PAGE_SIZE - BTRFS_CSUM_SIZE);
 
-               crc = btrfs_crc32c(crc, data, sublen);
+               crc = crc32c(crc, data, sublen);
        }
        btrfs_csum_final(crc, csum);
        if (memcmp(csum, h->csum, state->csum_size))

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a4877b6..92b9db7 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -40,6 +40,7 @@
 #include <linux/sizes.h>
 #include <linux/dynamic_debug.h>
 #include <linux/refcount.h>
+#include <linux/crc32c.h>
 #include "extent_io.h"
 #include "extent_map.h"
 #include "async-thread.h"
@@ -98,6 +99,7 @@ static const int btrfs_csum_sizes[] = { 4 };
 
 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
 
+
 /*
  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
  */
@@ -2553,6 +2555,20 @@ BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
        ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
        btrfs_item_offset_nr(leaf, slot)))
 
+static inline u64 btrfs_name_hash(const char *name, int len)
+{
+       return crc32c((u32)~1, name, len);
+}
+
+/*
+ * Figure the key offset of an extended inode ref
+ */
+static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
+                                   int len)
+{
+       return (u64) crc32c(parent_objectid, name, len);
+}
+
 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
 {
        return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&

diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index cbe4216..29e967b 100644 (file)
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -18,7 +18,6 @@
 
 #include "ctree.h"
 #include "disk-io.h"
-#include "hash.h"
 #include "transaction.h"
 
 /*

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9d2c932..c10c846 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -31,10 +31,10 @@
 #include <linux/uuid.h>
 #include <linux/semaphore.h>
 #include <linux/error-injection.h>
+#include <linux/crc32c.h>
 #include <asm/unaligned.h>
 #include "ctree.h"
 #include "disk-io.h"
-#include "hash.h"
 #include "transaction.h"
 #include "btrfs_inode.h"
 #include "volumes.h"
@@ -270,7 +270,7 @@ out:
 
 u32 btrfs_csum_data(const char *data, u32 seed, size_t len)
 {
-       return btrfs_crc32c(seed, data, len);
+       return crc32c(seed, data, len);
 }
 
 void btrfs_csum_final(u32 crc, u8 *result)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 22ac821..2760292 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -27,7 +27,7 @@
 #include <linux/ratelimit.h>
 #include <linux/percpu_counter.h>
 #include <linux/lockdep.h>
-#include "hash.h"
+#include <linux/crc32c.h>
 #include "tree-log.h"
 #include "disk-io.h"
 #include "print-tree.h"
@@ -1203,11 +1203,11 @@ static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset)
        __le64 lenum;
 
        lenum = cpu_to_le64(root_objectid);
-       high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
+       high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
        lenum = cpu_to_le64(owner);
-       low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
+       low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
        lenum = cpu_to_le64(offset);
-       low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
+       low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
 
        return ((u64)high_crc << 31) ^ (u64)low_crc;
 }
@@ -5944,7 +5944,7 @@ int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
         */
        u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
 
-       trace_btrfs_space_reservation(fs_info, "orphan", btrfs_ino(inode), 
+       trace_btrfs_space_reservation(fs_info, "orphan", btrfs_ino(inode),
                        num_bytes, 1);
        return btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);
 }

diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c
deleted file mode 100644 (file)
index baacc18..0000000
--- a/fs/btrfs/hash.c
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * 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);
-
-       return PTR_ERR_OR_ZERO(tfm);
-}
-
-const char* btrfs_crc32c_impl(void)
-{
-       return crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm));
-}
-
-void btrfs_hash_exit(void)
-{
-       crypto_free_shash(tfm);
-}
-
-u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
-{
-       SHASH_DESC_ON_STACK(shash, tfm);
-       u32 *ctx = (u32 *)shash_desc_ctx(shash);
-       u32 retval;
-       int err;
-
-       shash->tfm = tfm;
-       shash->flags = 0;
-       *ctx = crc;
-
-       err = crypto_shash_update(shash, address, length);
-       BUG_ON(err);
-
-       retval = *ctx;
-       barrier_data(ctx);
-       return retval;
-}

diff --git a/fs/btrfs/hash.h b/fs/btrfs/hash.h
deleted file mode 100644 (file)
index c3a2ec5..0000000
--- a/fs/btrfs/hash.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * Copyright (C) 2007 Oracle.  All rights reserved.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#ifndef __HASH__
-#define __HASH__
-
-int __init btrfs_hash_init(void);
-
-void btrfs_hash_exit(void);
-const char* btrfs_crc32c_impl(void);
-
-u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length);
-
-static inline u64 btrfs_name_hash(const char *name, int len)
-{
-       return btrfs_crc32c((u32)~1, name, len);
-}
-
-/*
- * Figure the key offset of an extended inode ref
- */
-static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
-                                   int len)
-{
-       return (u64) btrfs_crc32c(parent_objectid, name, len);
-}
-
-#endif

diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index 65e1a76..1d5631e 100644 (file)
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -18,7 +18,6 @@
 
 #include "ctree.h"
 #include "disk-io.h"
-#include "hash.h"
 #include "transaction.h"
 #include "print-tree.h"
 

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b55b47f..6504e63 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -58,7 +58,6 @@
 #include "free-space-cache.h"
 #include "inode-map.h"
 #include "backref.h"
-#include "hash.h"
 #include "props.h"
 #include "qgroup.h"
 #include "dedupe.h"

diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index b30a056..e4ac241 100644 (file)
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -19,8 +19,8 @@
 #include <linux/hashtable.h>
 #include "props.h"
 #include "btrfs_inode.h"
-#include "hash.h"
 #include "transaction.h"
+#include "ctree.h"
 #include "xattr.h"
 #include "compression.h"
 

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 484e2af..b0c5d71 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -27,10 +27,10 @@
 #include <linux/vmalloc.h>
 #include <linux/string.h>
 #include <linux/compat.h>
+#include <linux/crc32c.h>
 
 #include "send.h"
 #include "backref.h"
-#include "hash.h"
 #include "locking.h"
 #include "disk-io.h"
 #include "btrfs_inode.h"
@@ -695,7 +695,7 @@ static int send_cmd(struct send_ctx *sctx)
        hdr->len = cpu_to_le32(sctx->send_size - sizeof(*hdr));
        hdr->crc = 0;
 
-       crc = btrfs_crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size);
+       crc = crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size);
        hdr->crc = cpu_to_le32(crc);
 
        ret = write_buf(sctx->send_filp, sctx->send_buf, sctx->send_size,

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 540c185..5d752f7 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -41,6 +41,7 @@
 #include <linux/slab.h>
 #include <linux/cleancache.h>
 #include <linux/ratelimit.h>
+#include <linux/crc32c.h>
 #include <linux/btrfs.h>
 #include "delayed-inode.h"
 #include "ctree.h"
@@ -48,7 +49,6 @@
 #include "transaction.h"
 #include "btrfs_inode.h"
 #include "print-tree.h"
-#include "hash.h"
 #include "props.h"
 #include "xattr.h"
 #include "volumes.h"
@@ -2357,22 +2357,18 @@ static void __init btrfs_print_mod_info(void)
                        ", ref-verify=on"
 #endif
                        "\n",
-                       btrfs_crc32c_impl());
+                       crc32c_impl());
 }
 
 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)
-               goto free_hash;
+               return err;
 
        btrfs_init_compress();
 
@@ -2453,8 +2449,7 @@ free_cachep:
 free_compress:
        btrfs_exit_compress();
        btrfs_exit_sysfs();
-free_hash:
-       btrfs_hash_exit();
+
        return err;
 }
 
@@ -2474,7 +2469,6 @@ static void __exit exit_btrfs_fs(void)
        btrfs_exit_sysfs();
        btrfs_cleanup_fs_uuids();
        btrfs_exit_compress();
-       btrfs_hash_exit();
 }
 
 late_initcall(init_btrfs_fs);

diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index a5244f9..e96cfd9 100644 (file)
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -30,7 +30,6 @@
 #include "tree-checker.h"
 #include "disk-io.h"
 #include "compression.h"
-#include "hash.h"
 
 /*
  * Error message should follow the following format:

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index fac5fd1..bbd8a40 100644 (file)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -21,12 +21,12 @@
 #include <linux/blkdev.h>
 #include <linux/list_sort.h>
 #include <linux/iversion.h>
+#include "ctree.h"
 #include "tree-log.h"
 #include "disk-io.h"
 #include "locking.h"
 #include "print-tree.h"
 #include "backref.h"
-#include "hash.h"
 #include "compression.h"
 #include "qgroup.h"
 #include "inode-map.h"