On 2018/9/21 5:38, Jaegeuk Kim wrote: > On 09/20, Junling Zheng wrote: >> Hi, Jaegeuk >> >> On 2018/9/20 7:35, Jaegeuk Kim wrote: >>> On 09/19, Junling Zheng wrote: >>>> This patch introduced crc for superblock. >>>> >>>> Signed-off-by: Junling Zheng <zhengjunl...@huawei.com> >>>> --- >>>> fsck/mount.c | 33 +++++++++++++++++++++++++++++++++ >>>> fsck/resize.c | 12 ++++++------ >>>> include/f2fs_fs.h | 6 +++++- >>>> mkfs/f2fs_format.c | 8 ++++++++ >>>> 4 files changed, 52 insertions(+), 7 deletions(-) >>>> >>>> diff --git a/fsck/mount.c b/fsck/mount.c >>>> index 74ff7c6..9019921 100644 >>>> --- a/fsck/mount.c >>>> +++ b/fsck/mount.c >>>> @@ -340,6 +340,7 @@ void print_raw_sb_info(struct f2fs_super_block *sb) >>>> DISP_u32(sb, node_ino); >>>> DISP_u32(sb, meta_ino); >>>> DISP_u32(sb, cp_payload); >>>> + DISP_u32(sb, crc); >>>> DISP("%-.256s", sb, version); >>>> printf("\n"); >>>> } >>>> @@ -467,6 +468,9 @@ void print_sb_state(struct f2fs_super_block *sb) >>>> if (f & cpu_to_le32(F2FS_FEATURE_LOST_FOUND)) { >>>> MSG(0, "%s", " lost_found"); >>>> } >>>> + if (f & cpu_to_le32(F2FS_FEATURE_SB_CHKSUM)) { >>>> + MSG(0, "%s", " sb_checksum"); >>>> + } >>>> MSG(0, "\n"); >>>> MSG(0, "Info: superblock encrypt level = %d, salt = ", >>>> sb->encryption_level); >>>> @@ -479,10 +483,20 @@ void update_superblock(struct f2fs_super_block *sb, >>>> int sb_mask) >>>> { >>>> int index, ret; >>>> u_int8_t *buf; >>>> + u32 old_crc, new_crc; >>>> >>>> buf = calloc(BLOCK_SZ, 1); >>>> ASSERT(buf); >>>> >>>> + if (get_sb(feature) & F2FS_FEATURE_SB_CHKSUM) { >>>> + old_crc = get_sb(crc); >>>> + new_crc = f2fs_cal_crc32(F2FS_SUPER_MAGIC, sb, >>>> + SB_CHKSUM_OFFSET); >>>> + set_sb(crc, new_crc); >>>> + MSG(1, "Info: SB CRC is updated (0x%x -> 0x%x)\n", >>>> + old_crc, new_crc); >>>> + } >>>> + >>>> memcpy(buf + F2FS_SUPER_OFFSET, sb, sizeof(*sb)); >>>> for (index = 0; index < SB_ADDR_MAX; index++) { >>>> if ((1 << index) & sb_mask) { >>>> @@ -575,10 +589,29 @@ static inline int sanity_check_area_boundary(struct >>>> f2fs_super_block *sb, >>>> return 0; >>>> } >>>> >>>> +static int verify_sb_chksum(struct f2fs_super_block *sb) >>>> +{ >>>> + if (SB_CHKSUM_OFFSET != get_sb(checksum_offset)) { >>>> + MSG(0, "\tInvalid SB CRC offset: %u\n", >>>> + get_sb(checksum_offset)); >>>> + return -1; >>>> + } >>>> + if (f2fs_crc_valid(get_sb(crc), sb, >>>> + get_sb(checksum_offset))) { >>>> + MSG(0, "\tInvalid SB CRC: 0x%x\n", get_sb(crc)); >>>> + return -1; >>>> + } >>>> + return 0; >>>> +} >>>> + >>>> int sanity_check_raw_super(struct f2fs_super_block *sb, enum SB_ADDR >>>> sb_addr) >>>> { >>>> unsigned int blocksize; >>>> >>>> + if ((get_sb(feature) & F2FS_FEATURE_SB_CHKSUM) && >>>> + verify_sb_chksum(sb)) >>>> + return -1; >>>> + >>>> if (F2FS_SUPER_MAGIC != get_sb(magic)) >>>> return -1; >>>> >>>> diff --git a/fsck/resize.c b/fsck/resize.c >>>> index 5161a1f..3462165 100644 >>>> --- a/fsck/resize.c >>>> +++ b/fsck/resize.c >>>> @@ -603,9 +603,6 @@ static int f2fs_resize_grow(struct f2fs_sb_info *sbi) >>>> } >>>> } >>>> >>>> - print_raw_sb_info(sb); >>>> - print_raw_sb_info(new_sb); >>> >>> It'd be worth to keep this to show the previous states. >>> >> >> Here, I just want to move the printing of sb and new_sb to the place >> behind update_superblock(), where the crc in sb will be updated. > > We'd better to see the changes, no? >
Yeah, we print sb and new_sb here just for seeing the changes of superblock. However, the crc in new_sb will not be updated until calling update_superblock(), so if we keep the current printing location, we can't get the changes. Thanks, >> >>>> - >>>> old_main_blkaddr = get_sb(main_blkaddr); >>>> new_main_blkaddr = get_newsb(main_blkaddr); >>>> offset = new_main_blkaddr - old_main_blkaddr; >>>> @@ -629,6 +626,9 @@ static int f2fs_resize_grow(struct f2fs_sb_info *sbi) >>>> migrate_sit(sbi, new_sb, offset_seg); >>>> rebuild_checkpoint(sbi, new_sb, offset_seg); >>>> update_superblock(new_sb, SB_ALL); >>>> + print_raw_sb_info(sb); >>>> + print_raw_sb_info(new_sb); >>>> + >>>> return 0; >>>> } >>>> >>>> @@ -658,9 +658,6 @@ static int f2fs_resize_shrink(struct f2fs_sb_info *sbi) >>>> } >>>> } >>>> >>>> - print_raw_sb_info(sb); >>>> - print_raw_sb_info(new_sb); >>> >>> Ditto. >>> >>>> - >>>> old_main_blkaddr = get_sb(main_blkaddr); >>>> new_main_blkaddr = get_newsb(main_blkaddr); >>>> offset = old_main_blkaddr - new_main_blkaddr; >>>> @@ -690,6 +687,9 @@ static int f2fs_resize_shrink(struct f2fs_sb_info *sbi) >>>> /* move whole data region */ >>>> //if (err) >>>> // migrate_main(sbi, offset); >>>> + print_raw_sb_info(sb); >>>> + print_raw_sb_info(new_sb); >>>> + >>>> return 0; >>>> } >>>> >>>> diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h >>>> index 38a0da4..f80632a 100644 >>>> --- a/include/f2fs_fs.h >>>> +++ b/include/f2fs_fs.h >>>> @@ -279,6 +279,7 @@ static inline uint64_t bswap_64(uint64_t val) >>>> #define BITS_PER_BYTE 8 >>>> #define F2FS_SUPER_MAGIC 0xF2F52010 /* F2FS Magic Number */ >>>> #define CP_CHKSUM_OFFSET 4092 >>>> +#define SB_CHKSUM_OFFSET 3068 >>>> #define MAX_PATH_LEN 64 >>>> #define MAX_DEVICES 8 >>>> >>>> @@ -579,6 +580,7 @@ enum { >>>> #define F2FS_FEATURE_INODE_CRTIME 0x0100 >>>> #define F2FS_FEATURE_LOST_FOUND 0x0200 >>>> #define F2FS_FEATURE_VERITY 0x0400 /* reserved */ >>>> +#define F2FS_FEATURE_SB_CHKSUM 0x0800 >>>> >>>> #define MAX_VOLUME_NAME 512 >>>> >>>> @@ -632,7 +634,8 @@ struct f2fs_super_block { >>>> struct f2fs_device devs[MAX_DEVICES]; /* device list */ >>>> __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ >>>> __u8 hot_ext_count; /* # of hot file extension */ >>>> - __u8 reserved[314]; /* valid reserved region */ >>>> + __u8 reserved[310]; /* valid reserved region */ >>>> + __le32 crc; /* checksum of superblock */ >>>> } __attribute__((packed)); >>>> >>>> /* >>>> @@ -1338,6 +1341,7 @@ struct feature feature_table[] = { >>>> \ >>>> { "inode_crtime", F2FS_FEATURE_INODE_CRTIME }, \ >>>> { "lost_found", F2FS_FEATURE_LOST_FOUND }, \ >>>> { "verity", F2FS_FEATURE_VERITY }, /* reserved */ \ >>>> + { "sb_checksum", F2FS_FEATURE_SB_CHKSUM }, \ >>>> { NULL, 0x0}, \ >>>> }; >>>> >>>> diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c >>>> index 621126c..9b0a0d1 100644 >>>> --- a/mkfs/f2fs_format.c >>>> +++ b/mkfs/f2fs_format.c >>>> @@ -504,6 +504,14 @@ static int f2fs_prepare_super_block(void) >>>> >>>> sb->feature = c.feature; >>>> >>>> + if (get_sb(feature) & F2FS_FEATURE_SB_CHKSUM) { >>>> + set_sb(checksum_offset, SB_CHKSUM_OFFSET); >>>> + set_sb(crc, f2fs_cal_crc32(F2FS_SUPER_MAGIC, sb, >>>> + SB_CHKSUM_OFFSET)); >>>> + MSG(1, "Info: SB CRC is set: offset (%d), crc (0x%x)\n", >>>> + get_sb(checksum_offset), get_sb(crc)); >>>> + } >>>> + >>>> return 0; >>>> } >>>> >>>> -- >>>> 2.19.0 >>> >>> . >>> >> > > . > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel