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fs: btrfs: Use LZO_LEN to replace immediate number

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Just a cleanup. These immediate numbers make my eyes hurt.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Cc: Marek Behun <marek.behun@nic.cz>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Qu Wenruo 2020-03-26 13:35:54 +08:00 committed by Tom Rini
parent 0f238dab6d
commit 25babb7c1b
1 changed files with 12 additions and 10 deletions
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22
fs/btrfs/compression.c
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@ -12,36 +12,38 @@
#include <u-boot/zlib.h>
#include <asm/unaligned.h>
/* Header for each segment, LE32, recording the compressed size */
#define LZO_LEN 4
static u32 decompress_lzo(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen)
{
u32 tot_len, in_len, res;
size_t out_len;
int ret;
if (clen < 4)
if (clen < LZO_LEN)
return -1;
tot_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
cbuf += 4;
clen -= 4;
tot_len -= 4;
cbuf += LZO_LEN;
clen -= LZO_LEN;
tot_len -= LZO_LEN;
if (tot_len == 0 && dlen)
return -1;
if (tot_len < 4)
if (tot_len < LZO_LEN)
return -1;
res = 0;
while (tot_len > 4) {
while (tot_len > LZO_LEN) {
in_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
cbuf += 4;
clen -= 4;
cbuf += LZO_LEN;
clen -= LZO_LEN;
if (in_len > clen || tot_len < 4 + in_len)
if (in_len > clen || tot_len < LZO_LEN + in_len)
return -1;
tot_len -= 4 + in_len;
tot_len -= (LZO_LEN + in_len);
out_len = dlen;
ret = lzo1x_decompress_safe(cbuf, in_len, dbuf, &out_len);