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Date: Mon, 13 Oct 2014 09:43:19 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: Dmitry Monakhov <dmonakhov@...nvz.org>
Cc: linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: Replace open coded mdata csum feature to
helper function v2
On Mon, Oct 13, 2014 at 01:06:06AM +0400, Dmitry Monakhov wrote:
> Besides the fact that this replacement improves code readability
> it also protects from errors caused direct EXT4_S(sb)->s_es manipulation
> which may result attempt to use uninitialized csum machinery.
>
> #Testcase_BEGIN
> IMG=/dev/ram0
> MNT=/mnt
> mkfs.ext4 $IMG
> mount $IMG $MNT
> #Enable feature directly on disk, on mounted fs
> tune2fs -O metadata_csum $IMG
> # Provoke metadata update, likey result in OOPS
> touch $MNT/test
> umount $MNT
> #Testcase_END
>
> # Replacement script
> @@
> expression E;
> @@
> - EXT4_HAS_RO_COMPAT_FEATURE(E, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
> + ext4_has_metadata_csum(E)
>
> Changes v1->v2
> - fix early ext_fill_super stage
>
> https://bugzilla.kernel.org/show_bug.cgi?id=82201
>
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
> ---
> fs/ext4/bitmap.c | 12 ++++--------
> fs/ext4/ext4.h | 8 ++++++++
> fs/ext4/extents.c | 6 ++----
> fs/ext4/ialloc.c | 3 +--
> fs/ext4/inline.c | 3 +--
> fs/ext4/inode.c | 9 +++------
> fs/ext4/ioctl.c | 3 +--
> fs/ext4/mmp.c | 6 ++----
> fs/ext4/namei.c | 39 +++++++++++++--------------------------
> fs/ext4/resize.c | 3 +--
> fs/ext4/super.c | 15 +++++----------
> fs/ext4/xattr.c | 6 ++----
> 12 files changed, 43 insertions(+), 70 deletions(-)
>
> diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
> index 3285aa5..b610779 100644
> --- a/fs/ext4/bitmap.c
> +++ b/fs/ext4/bitmap.c
> @@ -24,8 +24,7 @@ int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
> __u32 provided, calculated;
> struct ext4_sb_info *sbi = EXT4_SB(sb);
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return 1;
>
> provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
> @@ -46,8 +45,7 @@ void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
> __u32 csum;
> struct ext4_sb_info *sbi = EXT4_SB(sb);
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return;
>
> csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
> @@ -65,8 +63,7 @@ int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
> struct ext4_sb_info *sbi = EXT4_SB(sb);
> int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return 1;
>
> provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
> @@ -91,8 +88,7 @@ void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
> __u32 csum;
> struct ext4_sb_info *sbi = EXT4_SB(sb);
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return;
>
> csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 012e89b..1483d9c 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2337,6 +2337,14 @@ static inline int ext4_has_group_desc_csum(struct super_block *sb)
> EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
Please change the raw metadata_csum flag check in ext4_has_group_desc_csum(),
otherwise we'll still suffer from this bug.
> }
>
> +static inline int ext4_has_metadata_csum(struct super_block *sb)
> +{
> + WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
> + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
> + !EXT4_SB(sb)->s_chksum_driver);
I was about to protest about not checking the flag and s_chksum_driver...
Then I realized that tune2fs can set and clear the metadata_csum flag on a
mounted FS. Oh crap.
So maybe it would be a good idea to check both the driver pointer and the
feature flag just to make sure the user really wants checksumming, though in
the meantime I have a e2fsprogs bug to fix.
--D
> +
> + return (EXT4_SB(sb)->s_chksum_driver != NULL);
> +}
> static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
> {
> return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index c3ed9af..37043d0 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -73,8 +73,7 @@ static int ext4_extent_block_csum_verify(struct inode *inode,
> {
> struct ext4_extent_tail *et;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(inode->i_sb))
> return 1;
>
> et = find_ext4_extent_tail(eh);
> @@ -88,8 +87,7 @@ static void ext4_extent_block_csum_set(struct inode *inode,
> {
> struct ext4_extent_tail *et;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(inode->i_sb))
> return;
>
> et = find_ext4_extent_tail(eh);
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index 5b87fc3..8012a5d 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -1011,8 +1011,7 @@ got:
> spin_unlock(&sbi->s_next_gen_lock);
>
> /* Precompute checksum seed for inode metadata */
> - if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
> + if (ext4_has_metadata_csum(sb)) {
> __u32 csum;
> __le32 inum = cpu_to_le32(inode->i_ino);
> __le32 gen = cpu_to_le32(inode->i_generation);
> diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
> index 378aadf..3ea6269 100644
> --- a/fs/ext4/inline.c
> +++ b/fs/ext4/inline.c
> @@ -1128,8 +1128,7 @@ static int ext4_finish_convert_inline_dir(handle_t *handle,
> memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
> inline_size - EXT4_INLINE_DOTDOT_SIZE);
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(inode->i_sb))
> csum_size = sizeof(struct ext4_dir_entry_tail);
>
> inode->i_size = inode->i_sb->s_blocksize;
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 0dd9150..e9777f9 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -83,8 +83,7 @@ static int ext4_inode_csum_verify(struct inode *inode, struct ext4_inode *raw,
>
> if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
> cpu_to_le32(EXT4_OS_LINUX) ||
> - !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + !ext4_has_metadata_csum(inode->i_sb))
> return 1;
>
> provided = le16_to_cpu(raw->i_checksum_lo);
> @@ -105,8 +104,7 @@ static void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
>
> if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
> cpu_to_le32(EXT4_OS_LINUX) ||
> - !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + !ext4_has_metadata_csum(inode->i_sb))
> return;
>
> csum = ext4_inode_csum(inode, raw, ei);
> @@ -3928,8 +3926,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
> ei->i_extra_isize = 0;
>
> /* Precompute checksum seed for inode metadata */
> - if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
> + if (ext4_has_metadata_csum(sb)) {
> struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
> __u32 csum;
> __le32 inum = cpu_to_le32(inode->i_ino);
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index 3d5de16..bfda18a 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -331,8 +331,7 @@ flags_out:
> if (!inode_owner_or_capable(inode))
> return -EPERM;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
> + if (ext4_has_metadata_csum(inode->i_sb)) {
> ext4_warning(sb, "Setting inode version is not "
> "supported with metadata_csum enabled.");
> return -ENOTTY;
> diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
> index 32bce84..8313ca3 100644
> --- a/fs/ext4/mmp.c
> +++ b/fs/ext4/mmp.c
> @@ -20,8 +20,7 @@ static __le32 ext4_mmp_csum(struct super_block *sb, struct mmp_struct *mmp)
>
> static int ext4_mmp_csum_verify(struct super_block *sb, struct mmp_struct *mmp)
> {
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return 1;
>
> return mmp->mmp_checksum == ext4_mmp_csum(sb, mmp);
> @@ -29,8 +28,7 @@ static int ext4_mmp_csum_verify(struct super_block *sb, struct mmp_struct *mmp)
>
> static void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp)
> {
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return;
>
> mmp->mmp_checksum = ext4_mmp_csum(sb, mmp);
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 7037ecf..61756f9 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -124,8 +124,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
> "directory leaf block found instead of index block");
> return ERR_PTR(-EIO);
> }
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) ||
> + if (!ext4_has_metadata_csum(inode->i_sb) ||
> buffer_verified(bh))
> return bh;
>
> @@ -338,8 +337,7 @@ int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent)
> {
> struct ext4_dir_entry_tail *t;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(inode->i_sb))
> return 1;
>
> t = get_dirent_tail(inode, dirent);
> @@ -360,8 +358,7 @@ static void ext4_dirent_csum_set(struct inode *inode,
> {
> struct ext4_dir_entry_tail *t;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(inode->i_sb))
> return;
>
> t = get_dirent_tail(inode, dirent);
> @@ -436,8 +433,7 @@ static int ext4_dx_csum_verify(struct inode *inode,
> struct dx_tail *t;
> int count_offset, limit, count;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(inode->i_sb))
> return 1;
>
> c = get_dx_countlimit(inode, dirent, &count_offset);
> @@ -466,8 +462,7 @@ static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
> struct dx_tail *t;
> int count_offset, limit, count;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(inode->i_sb))
> return;
>
> c = get_dx_countlimit(inode, dirent, &count_offset);
> @@ -555,8 +550,7 @@ static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
> unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
> EXT4_DIR_REC_LEN(2) - infosize;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(dir->i_sb))
> entry_space -= sizeof(struct dx_tail);
> return entry_space / sizeof(struct dx_entry);
> }
> @@ -565,8 +559,7 @@ static inline unsigned dx_node_limit(struct inode *dir)
> {
> unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(dir->i_sb))
> entry_space -= sizeof(struct dx_tail);
> return entry_space / sizeof(struct dx_entry);
> }
> @@ -1524,8 +1517,7 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
> int csum_size = 0;
> int err = 0, i;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(dir->i_sb))
> csum_size = sizeof(struct ext4_dir_entry_tail);
>
> bh2 = ext4_append(handle, dir, &newblock);
> @@ -1691,8 +1683,7 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
> int csum_size = 0;
> int err;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(inode->i_sb))
> csum_size = sizeof(struct ext4_dir_entry_tail);
>
> if (!de) {
> @@ -1759,8 +1750,7 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
> struct fake_dirent *fde;
> int csum_size = 0;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(inode->i_sb))
> csum_size = sizeof(struct ext4_dir_entry_tail);
>
> blocksize = dir->i_sb->s_blocksize;
> @@ -1877,8 +1867,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
> ext4_lblk_t block, blocks;
> int csum_size = 0;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(inode->i_sb))
> csum_size = sizeof(struct ext4_dir_entry_tail);
>
> sb = dir->i_sb;
> @@ -2142,8 +2131,7 @@ static int ext4_delete_entry(handle_t *handle,
> return err;
> }
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(dir->i_sb))
> csum_size = sizeof(struct ext4_dir_entry_tail);
>
> BUFFER_TRACE(bh, "get_write_access");
> @@ -2362,8 +2350,7 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
> int csum_size = 0;
> int err;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(dir->i_sb))
> csum_size = sizeof(struct ext4_dir_entry_tail);
>
> if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
> diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
> index bb0e80f..d5afb0a 100644
> --- a/fs/ext4/resize.c
> +++ b/fs/ext4/resize.c
> @@ -1210,8 +1210,7 @@ static int ext4_set_bitmap_checksums(struct super_block *sb,
> {
> struct buffer_head *bh;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return 0;
>
> bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index a0811cc..5afe42d 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -140,8 +140,7 @@ static __le32 ext4_superblock_csum(struct super_block *sb,
> static int ext4_superblock_csum_verify(struct super_block *sb,
> struct ext4_super_block *es)
> {
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return 1;
>
> return es->s_checksum == ext4_superblock_csum(sb, es);
> @@ -151,8 +150,7 @@ void ext4_superblock_csum_set(struct super_block *sb)
> {
> struct ext4_super_block *es = EXT4_SB(sb)->s_es;
>
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(sb))
> return;
>
> es->s_checksum = ext4_superblock_csum(sb, es);
> @@ -1989,8 +1987,7 @@ static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
> __u16 crc = 0;
> __le32 le_group = cpu_to_le32(block_group);
>
> - if ((sbi->s_es->s_feature_ro_compat &
> - cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
> + if (ext4_has_metadata_csum(sbi->s_sb)) {
> /* Use new metadata_csum algorithm */
> __le16 save_csum;
> __u32 csum32;
> @@ -3199,8 +3196,7 @@ static int set_journal_csum_feature_set(struct super_block *sb)
> int compat, incompat;
> struct ext4_sb_info *sbi = EXT4_SB(sb);
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
> + if (ext4_has_metadata_csum(sb)) {
> /* journal checksum v3 */
> compat = 0;
> incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
> @@ -3508,8 +3504,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> }
>
> /* Precompute checksum seed for all metadata */
> - if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (ext4_has_metadata_csum(sb))
> sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
> sizeof(es->s_uuid));
>
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index 42823ab..1e09fc7 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -142,8 +142,7 @@ static int ext4_xattr_block_csum_verify(struct inode *inode,
> sector_t block_nr,
> struct ext4_xattr_header *hdr)
> {
> - if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
> + if (ext4_has_metadata_csum(inode->i_sb) &&
> (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr)))
> return 0;
> return 1;
> @@ -153,8 +152,7 @@ static void ext4_xattr_block_csum_set(struct inode *inode,
> sector_t block_nr,
> struct ext4_xattr_header *hdr)
> {
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
> - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + if (!ext4_has_metadata_csum(inode->i_sb))
> return;
>
> hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr);
> --
> 1.7.1
>
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