diff options
Diffstat (limited to 'fs/f2fs/f2fs.h')
| -rw-r--r-- | fs/f2fs/f2fs.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 863a5e91d84a..467d42d65c48 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -47,14 +47,25 @@ struct f2fs_mount_info { unsigned int opt; }; -static inline __u32 f2fs_crc32(void *buff, size_t len) +#define CRCPOLY_LE 0xedb88320 + +static inline __u32 f2fs_crc32(void *buf, size_t len) { - return crc32_le(F2FS_SUPER_MAGIC, buff, len); + unsigned char *p = (unsigned char *)buf; + __u32 crc = F2FS_SUPER_MAGIC; + int i; + + while (len--) { + crc ^= *p++; + for (i = 0; i < 8; i++) + crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); + } + return crc; } -static inline bool f2fs_crc_valid(__u32 blk_crc, void *buff, size_t buff_size) +static inline bool f2fs_crc_valid(__u32 blk_crc, void *buf, size_t buf_size) { - return f2fs_crc32(buff, buff_size) == blk_crc; + return f2fs_crc32(buf, buf_size) == blk_crc; } /* |