summaryrefslogtreecommitdiff
path: root/fs/f2fs/f2fs.h
diff options
context:
space:
mode:
authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-06-19 20:47:19 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-07-02 08:47:35 +0900
commit7e586fa0244578320fcced9cc08c6b124f727c35 (patch)
treefb95e07a67d211f84d8722b4240c4c826822c4df /fs/f2fs/f2fs.h
parent696c018c7718f5e33e1107da19c4d64a25018878 (diff)
f2fs: fix crc endian conversion
While calculating CRC for the checkpoint block, we use __u32, but when storing the crc value to the disk, we use __le32. Let's fix the inconsistency. Reported-and-Tested-by: Oded Gabbay <ogabbay@advaoptical.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/f2fs.h')
-rw-r--r--fs/f2fs/f2fs.h19
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;
}
/*