fs: btrfs: Use LZO_LEN to replace immediate number
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>
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 346875d..4ef44ce 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -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);