Commit 65019df8 authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by David Sterba
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btrfs: resurrect btrfs_crc32c() 



Commit 9678c543 ("btrfs: Remove custom crc32c init code") removed
the btrfs_crc32c() function, because it was a duplicate of the crc32c()
library function we already have in the kernel.

Resurrect it as a shim wrapper over crc32c() to make following
transformations of the checksumming code in btrfs easier.

Also provide a btrfs_crc32_final() to ease following transformations.

Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Signed-off-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 5852c8b9

fs/btrfs/ctree.h

+11 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/kobject.h>

#include <trace/events/btrfs.h>

#include <asm/kmap_types.h>

#include <asm/unaligned.h>

#include <linux/pagemap.h>

#include <linux/btrfs.h>

#include <linux/btrfs_tree.h>
@@ -2644,6 +2645,16 @@ BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right, 
	((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \

	btrfs_item_offset_nr(leaf, slot)))



static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)

{

	return crc32c(crc, address, length);

}



static inline void btrfs_crc32c_final(u32 crc, u8 *result)

{

	put_unaligned_le32(~crc, result);

}



static inline u64 btrfs_name_hash(const char *name, int len)

{

       return crc32c((u32)~1, name, len);

fs/btrfs/extent-tree.c

+3 −3
Original line number Diff line number Diff line
@@ -1135,11 +1135,11 @@ 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;

}

fs/btrfs/send.c

+1 −1
Original line number Diff line number Diff line
@@ -686,7 +686,7 @@ static int send_cmd(struct send_ctx *sctx) 
	hdr->len = cpu_to_le32(sctx->send_size - sizeof(*hdr));

	hdr->crc = 0;



	crc = crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size);

	crc = btrfs_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,

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