From 25babb7c1b52bbe62ff9433c07f9e491b9d1b6af Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Thu, 26 Mar 2020 13:35:54 +0800 Subject: fs: btrfs: Use LZO_LEN to replace immediate number MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Just a cleanup. These immediate numbers make my eyes hurt. Signed-off-by: Qu Wenruo Cc: Marek Behun Reviewed-by: Marek Behún --- fs/btrfs/compression.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 346875d45a..4ef44ce114 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -12,36 +12,38 @@ #include #include +/* 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); -- cgit v1.2.3