On 2018/8/8 20:24, Chao Yu wrote:
> On 2018/8/8 20:21, Junling Zheng wrote:
>> On 2018/8/8 20:03, Chao Yu wrote:
>>> On 2018/8/8 18:27, Junling Zheng wrote:
>>>> Now we support crc32 checksum for superblock.
>>>>
>>>> Signed-off-by: Junling Zheng <zhengjunl...@huawei.com>
>>>> ---
>>>> 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);
>>>
>>
>> :( sorry, I'll send a v4 patch.
>>
>>> Otherwise, it looks good to me, you can add in next version:
>>>
>>> Reviewed-by: Chao Yu <yuch...@huawei.com>
>>>
>>> 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)) {
>
> Can we change to use f2fs_sb_has_sb_chksum()?
>
Sure, that will be better :)
> Thanks,
>
>>>> + 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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