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btrfs: resurrect btrfs_crc32c()
Commit 9678c54388
("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: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
parent
5852c8b961
commit
65019df8c3
3 changed files with 15 additions and 4 deletions
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@ -19,6 +19,7 @@
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#include <linux/kobject.h>
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#include <trace/events/btrfs.h>
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#include <asm/kmap_types.h>
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#include <asm/unaligned.h>
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#include <linux/pagemap.h>
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#include <linux/btrfs.h>
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#include <linux/btrfs_tree.h>
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@ -2644,6 +2645,16 @@ BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
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((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
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btrfs_item_offset_nr(leaf, slot)))
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static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
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{
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return crc32c(crc, address, length);
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}
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static inline void btrfs_crc32c_final(u32 crc, u8 *result)
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{
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put_unaligned_le32(~crc, result);
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}
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static inline u64 btrfs_name_hash(const char *name, int len)
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{
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return crc32c((u32)~1, name, len);
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@ -1135,11 +1135,11 @@ static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset)
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__le64 lenum;
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lenum = cpu_to_le64(root_objectid);
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high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
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high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
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lenum = cpu_to_le64(owner);
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low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
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low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
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lenum = cpu_to_le64(offset);
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low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
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low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
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return ((u64)high_crc << 31) ^ (u64)low_crc;
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}
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@ -686,7 +686,7 @@ static int send_cmd(struct send_ctx *sctx)
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hdr->len = cpu_to_le32(sctx->send_size - sizeof(*hdr));
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hdr->crc = 0;
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crc = crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size);
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crc = btrfs_crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size);
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hdr->crc = cpu_to_le32(crc);
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ret = write_buf(sctx->send_filp, sctx->send_buf, sctx->send_size,
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