From 704956ecf5bcdc14d14650f39f2b545b34c96265 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Mon, 31 Jul 2017 20:19:09 +0800 Subject: f2fs: support inode checksum This patch adds to support inode checksum in f2fs. Signed-off-by: Chao Yu [Jaegeuk Kim: fix verification flow] Signed-off-by: Jaegeuk Kim --- fs/f2fs/f2fs.h | 32 +++++++++++++++++++++++++ fs/f2fs/inode.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/f2fs/node.c | 7 ++++++ fs/f2fs/segment.c | 5 +++- fs/f2fs/super.c | 5 ++++ 5 files changed, 118 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 1c31e4e7bde6..7c1244ba92a8 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -116,6 +116,7 @@ struct f2fs_mount_info { #define F2FS_FEATURE_ATOMIC_WRITE 0x0004 #define F2FS_FEATURE_EXTRA_ATTR 0x0008 #define F2FS_FEATURE_PRJQUOTA 0x0010 +#define F2FS_FEATURE_INODE_CHKSUM 0x0020 #define F2FS_HAS_FEATURE(sb, mask) \ ((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0) @@ -1085,6 +1086,9 @@ struct f2fs_sb_info { /* Reference to checksum algorithm driver via cryptoapi */ struct crypto_shash *s_chksum_driver; + /* Precomputed FS UUID checksum for seeding other checksums */ + __u32 s_chksum_seed; + /* For fault injection */ #ifdef CONFIG_F2FS_FAULT_INJECTION struct f2fs_fault_info fault_info; @@ -1176,6 +1180,27 @@ static inline bool f2fs_crc_valid(struct f2fs_sb_info *sbi, __u32 blk_crc, return f2fs_crc32(sbi, buf, buf_size) == blk_crc; } +static inline u32 f2fs_chksum(struct f2fs_sb_info *sbi, u32 crc, + const void *address, unsigned int length) +{ + struct { + struct shash_desc shash; + char ctx[4]; + } desc; + int err; + + BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver) != sizeof(desc.ctx)); + + desc.shash.tfm = sbi->s_chksum_driver; + desc.shash.flags = 0; + *(u32 *)desc.ctx = crc; + + err = crypto_shash_update(&desc.shash, address, length); + BUG_ON(err); + + return *(u32 *)desc.ctx; +} + static inline struct f2fs_inode_info *F2FS_I(struct inode *inode) { return container_of(inode, struct f2fs_inode_info, vfs_inode); @@ -2285,6 +2310,8 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); * inode.c */ void f2fs_set_inode_flags(struct inode *inode); +bool f2fs_inode_chksum_verify(struct f2fs_sb_info *sbi, struct page *page); +void f2fs_inode_chksum_set(struct f2fs_sb_info *sbi, struct page *page); struct inode *f2fs_iget(struct super_block *sb, unsigned long ino); struct inode *f2fs_iget_retry(struct super_block *sb, unsigned long ino); int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink); @@ -2869,6 +2896,11 @@ static inline int f2fs_sb_has_project_quota(struct super_block *sb) return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_PRJQUOTA); } +static inline int f2fs_sb_has_inode_chksum(struct super_block *sb) +{ + return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_INODE_CHKSUM); +} + #ifdef CONFIG_BLK_DEV_ZONED static inline int get_blkz_type(struct f2fs_sb_info *sbi, struct block_device *bdev, block_t blkaddr) diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index f15e663a1a15..b4c401d456e7 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -108,6 +108,76 @@ static void __recover_inline_status(struct inode *inode, struct page *ipage) return; } +static bool f2fs_enable_inode_chksum(struct f2fs_sb_info *sbi, struct page *page) +{ + struct f2fs_inode *ri = &F2FS_NODE(page)->i; + int extra_isize = le32_to_cpu(ri->i_extra_isize); + + if (!f2fs_sb_has_inode_chksum(sbi->sb)) + return false; + + if (!RAW_IS_INODE(F2FS_NODE(page)) || !(ri->i_inline & F2FS_EXTRA_ATTR)) + return false; + + if (!F2FS_FITS_IN_INODE(ri, extra_isize, i_inode_checksum)) + return false; + + return true; +} + +static __u32 f2fs_inode_chksum(struct f2fs_sb_info *sbi, struct page *page) +{ + struct f2fs_node *node = F2FS_NODE(page); + struct f2fs_inode *ri = &node->i; + __le32 ino = node->footer.ino; + __le32 gen = ri->i_generation; + __u32 chksum, chksum_seed; + __u32 dummy_cs = 0; + unsigned int offset = offsetof(struct f2fs_inode, i_inode_checksum); + unsigned int cs_size = sizeof(dummy_cs); + + chksum = f2fs_chksum(sbi, sbi->s_chksum_seed, (__u8 *)&ino, + sizeof(ino)); + chksum_seed = f2fs_chksum(sbi, chksum, (__u8 *)&gen, sizeof(gen)); + + chksum = f2fs_chksum(sbi, chksum_seed, (__u8 *)ri, offset); + chksum = f2fs_chksum(sbi, chksum, (__u8 *)&dummy_cs, cs_size); + offset += cs_size; + chksum = f2fs_chksum(sbi, chksum, (__u8 *)ri + offset, + F2FS_BLKSIZE - offset); + return chksum; +} + +bool f2fs_inode_chksum_verify(struct f2fs_sb_info *sbi, struct page *page) +{ + struct f2fs_inode *ri; + __u32 provided, calculated; + + if (!f2fs_enable_inode_chksum(sbi, page)) + return true; + + ri = &F2FS_NODE(page)->i; + provided = le32_to_cpu(ri->i_inode_checksum); + calculated = f2fs_inode_chksum(sbi, page); + + if (provided != calculated) + f2fs_msg(sbi->sb, KERN_WARNING, + "checksum invalid, ino = %x, %x vs. %x", + ino_of_node(page), provided, calculated); + + return provided == calculated; +} + +void f2fs_inode_chksum_set(struct f2fs_sb_info *sbi, struct page *page) +{ + struct f2fs_inode *ri = &F2FS_NODE(page)->i; + + if (!f2fs_enable_inode_chksum(sbi, page)) + return; + + ri->i_inode_checksum = cpu_to_le32(f2fs_inode_chksum(sbi, page)); +} + static int do_read_inode(struct inode *inode) { struct f2fs_sb_info *sbi = F2FS_I_SB(inode); diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 14b79a396a3f..0176035d8ced 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1171,6 +1171,11 @@ repeat: err = -EIO; goto out_err; } + + if (!f2fs_inode_chksum_verify(sbi, page)) { + err = -EBADMSG; + goto out_err; + } page_hit: if(unlikely(nid != nid_of_node(page))) { f2fs_msg(sbi->sb, KERN_WARNING, "inconsistent node block, " @@ -2275,6 +2280,8 @@ retry: F2FS_FITS_IN_INODE(src, le16_to_cpu(src->i_extra_isize), i_projid)) dst->i_projid = src->i_projid; + + f2fs_inode_chksum_set(sbi, ipage); } new_ni = old_ni; diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 2a5672a20a62..8911f50ddef6 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -2214,9 +2214,12 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, mutex_unlock(&sit_i->sentry_lock); - if (page && IS_NODESEG(type)) + if (page && IS_NODESEG(type)) { fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg)); + f2fs_inode_chksum_set(sbi, page); + } + if (add_list) { struct f2fs_bio_info *io; diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 4c28576c5b30..fc757c8861b7 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1993,6 +1993,11 @@ try_onemore: sb->s_fs_info = sbi; sbi->raw_super = raw_super; + /* precompute checksum seed for metadata */ + if (f2fs_sb_has_inode_chksum(sb)) + sbi->s_chksum_seed = f2fs_chksum(sbi, ~0, raw_super->uuid, + sizeof(raw_super->uuid)); + /* * The BLKZONED feature indicates that the drive was formatted with * zone alignment optimization. This is optional for host-aware -- cgit v1.2.3