ext4: Replace open coded mdata csum feature to helper function

commit 9aa5d32ba269bec0e7eaba2697a986a7b0bc8528 upstream.

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)

https://bugzilla.kernel.org/show_bug.cgi?id=82201

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
index 3285aa5..b610779 100644 (file)
--- 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 8f5a054..f57e9a7 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2345,6 +2345,14 @@ static inline int ext4_has_group_desc_csum(struct super_block *sb)
                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
 }
 
+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);
+
+       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 4718891..96a1ce1 100644 (file)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -74,8 +74,7 @@ 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);
@@ -89,8 +88,7 @@ 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 64bb32f..158ddf6 100644 (file)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -988,8 +988,7 @@ 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 82edf5b..8c03b74 100644 (file)
--- 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 2c9fc10..3a7e034 100644 (file)
--- 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);
@@ -4076,8 +4074,7 @@ 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 f115b96..dfe982d 100644 (file)
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -343,8 +343,7 @@ 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 04434ad..1268a1b 100644 (file)
--- 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)
 
 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 @@ int ext4_mmp_csum_verify(struct super_block *sb, struct mmp_struct *mmp)
 
 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 ad36eb3..2dcbfb6 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -123,8 +123,7 @@ 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;
 
@@ -339,8 +338,7 @@ 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);
@@ -361,8 +359,7 @@ 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);
@@ -437,8 +434,7 @@ 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);
@@ -467,8 +463,7 @@ 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);
@@ -556,8 +551,7 @@ 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);
 }
@@ -566,8 +560,7 @@ 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);
 }
@@ -1534,8 +1527,7 @@ 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);
@@ -1704,8 +1696,7 @@ 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) {
@@ -1772,8 +1763,7 @@ 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;
@@ -1889,8 +1879,7 @@ 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;
@@ -2152,8 +2141,7 @@ 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");
@@ -2372,8 +2360,7 @@ 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 f3b84cd..14e0f8a 100644 (file)
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1200,8 +1200,7 @@ 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 c888f23..6686ce4 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -140,8 +140,7 @@ static __le32 ext4_superblock_csum(struct super_block *sb,
 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);
@@ -2003,8 +2001,7 @@ 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;
@@ -3160,8 +3157,7 @@ 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;
@@ -3468,8 +3464,7 @@ 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 66274f8..8825154 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -141,8 +141,7 @@ 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;
@@ -152,8 +151,7 @@ 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);