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 <[email protected]>
>>>> ---
>>>> 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
>>>
>>> .
>>>
>>
>
> .
>
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