On 2018/8/8 18:27, Junling Zheng wrote:
> Now we support crc32 checksum for superblock.
>
> Signed-off-by: Junling Zheng <[email protected]>
> ---
> v2 -> v3:
> - add sysfs entry for superblock checksum.
> - move the crc checking to the beginning of sanity_check_raw_super().
> - fix the NULL pointer dereference as sb->s_fs_info hasn't be set yet in
> sanity_check_raw_super().
> v1 -> v2:
> - fix to switch endian of crc.
> fs/f2fs/f2fs.h | 2 ++
> fs/f2fs/super.c | 29 +++++++++++++++++++++++++++++
> fs/f2fs/sysfs.c | 7 +++++++
> include/linux/f2fs_fs.h | 3 ++-
> 4 files changed, 40 insertions(+), 1 deletion(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 4525f4f82af0..d50d6efda96b 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -147,6 +147,7 @@ struct f2fs_mount_info {
> #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 F2FS_HAS_FEATURE(sb, mask) \
> ((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
> @@ -3376,6 +3377,7 @@ F2FS_FEATURE_FUNCS(flexible_inline_xattr,
> FLEXIBLE_INLINE_XATTR);
> F2FS_FEATURE_FUNCS(quota_ino, QUOTA_INO);
> F2FS_FEATURE_FUNCS(inode_crtime, INODE_CRTIME);
> F2FS_FEATURE_FUNCS(lost_found, LOST_FOUND);
> +F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM);
>
> #ifdef CONFIG_BLK_DEV_ZONED
> static inline int get_blkz_type(struct f2fs_sb_info *sbi,
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index bd57be470e23..c3dbafa31613 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2149,6 +2149,26 @@ static int sanity_check_raw_super(struct f2fs_sb_info
> *sbi,
> (bh->b_data + F2FS_SUPER_OFFSET);
> struct super_block *sb = sbi->sb;
> unsigned int blocksize;
> + size_t crc_offset = 0;
> + __u32 crc = 0;
> +
> + /* Check checksum_offset and crc in superblock */
> + if (le32_to_cpu(raw_super->feature) & F2FS_FEATURE_SB_CHKSUM) {
> + crc_offset = le32_to_cpu(raw_super->checksum_offset);
> + if (crc_offset !=
> + offsetof(struct f2fs_super_block, crc)) {
> + f2fs_msg(sb, KERN_INFO,
> + "Invalid SB checksum offset: %lu",
warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument
4 has type ‘size_t’ [-Wformat=]
crc_offset);
Otherwise, it looks good to me, you can add in next version:
Reviewed-by: Chao Yu <[email protected]>
Thanks,
> + crc_offset);
> + return 1;
> + }
> + crc = le32_to_cpu(raw_super->crc);
> + if (!f2fs_crc_valid(sbi, crc, raw_super, crc_offset)) {
> + f2fs_msg(sb, KERN_INFO,
> + "Invalid SB checksum value: %u", crc);
> + return 1;
> + }
> + }
>
> if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
> f2fs_msg(sb, KERN_INFO,
> @@ -2568,6 +2588,7 @@ static int read_raw_super_block(struct f2fs_sb_info
> *sbi,
> int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
> {
> struct buffer_head *bh;
> + __u32 crc = 0;
> int err;
>
> if ((recover && f2fs_readonly(sbi->sb)) ||
> @@ -2576,6 +2597,14 @@ int f2fs_commit_super(struct f2fs_sb_info *sbi, bool
> recover)
> return -EROFS;
> }
>
> + /* we should update superblock crc here */
> + if (!recover &&
> + F2FS_HAS_FEATURE(sbi->sb, F2FS_FEATURE_SB_CHKSUM)) {
> + crc = f2fs_crc32(sbi, F2FS_RAW_SUPER(sbi),
> + offsetof(struct f2fs_super_block, crc));
> + F2FS_RAW_SUPER(sbi)->crc = cpu_to_le32(crc);
> + }
> +
> /* write back-up superblock first */
> bh = sb_bread(sbi->sb, sbi->valid_super_block ? 0 : 1);
> if (!bh)
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index cd2e030e47b8..c86d91be6c48 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -120,6 +120,9 @@ static ssize_t features_show(struct f2fs_attr *a,
> if (f2fs_sb_has_lost_found(sb))
> len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
> len ? ", " : "", "lost_found");
> + if (f2fs_sb_has_sb_chksum(sb))
> + len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
> + len ? ", " : "", "sb_checksum");
> len += snprintf(buf + len, PAGE_SIZE - len, "\n");
> return len;
> }
> @@ -337,6 +340,7 @@ enum feat_id {
> FEAT_QUOTA_INO,
> FEAT_INODE_CRTIME,
> FEAT_LOST_FOUND,
> + FEAT_SB_CHECKSUM,
> };
>
> static ssize_t f2fs_feature_show(struct f2fs_attr *a,
> @@ -353,6 +357,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
> case FEAT_QUOTA_INO:
> case FEAT_INODE_CRTIME:
> case FEAT_LOST_FOUND:
> + case FEAT_SB_CHECKSUM:
> return snprintf(buf, PAGE_SIZE, "supported\n");
> }
> return 0;
> @@ -433,6 +438,7 @@ F2FS_FEATURE_RO_ATTR(flexible_inline_xattr,
> FEAT_FLEXIBLE_INLINE_XATTR);
> F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
> F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
> F2FS_FEATURE_RO_ATTR(lost_found, FEAT_LOST_FOUND);
> +F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
>
> #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
> static struct attribute *f2fs_attrs[] = {
> @@ -489,6 +495,7 @@ static struct attribute *f2fs_feat_attrs[] = {
> ATTR_LIST(quota_ino),
> ATTR_LIST(inode_crtime),
> ATTR_LIST(lost_found),
> + ATTR_LIST(sb_checksum),
> NULL,
> };
>
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index f70f8ac9c4f4..aa4b586569c1 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -112,7 +112,8 @@ 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 */
> } __packed;
>
> /*
>
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