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ext4: factor out ext4_init_metadata_csum()

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Factor out ext4_init_metadata_csum(). No functional change.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20220916141527.1012715-9-yanaijie@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jason Yan 2022-09-16 22:15:19 +08:00 committed by Theodore Ts'o
parent 39c135b08c
commit b26458d151
1 changed files with 46 additions and 37 deletions
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83
fs/ext4/super.c
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@ -4540,6 +4540,50 @@ static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_b
} }
#endif #endif
static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
/* Warn if metadata_csum and gdt_csum are both set. */
if (ext4_has_feature_metadata_csum(sb) &&
ext4_has_feature_gdt_csum(sb))
ext4_warning(sb, "metadata_csum and uninit_bg are "
"redundant flags; please run fsck.");
/* Check for a known checksum algorithm */
if (!ext4_verify_csum_type(sb, es)) {
ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
"unknown checksum algorithm.");
return -EINVAL;
}
ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
ext4_orphan_file_block_trigger);
/* Load the checksum driver */
sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
if (IS_ERR(sbi->s_chksum_driver)) {
int ret = PTR_ERR(sbi->s_chksum_driver);
ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
sbi->s_chksum_driver = NULL;
return ret;
}
/* Check superblock checksum */
if (!ext4_superblock_csum_verify(sb, es)) {
ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
"invalid superblock checksum. Run e2fsck?");
return -EFSBADCRC;
}
/* Precompute checksum seed for all metadata */
if (ext4_has_feature_csum_seed(sb))
sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
sizeof(es->s_uuid));
return 0;
}
static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb) static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
{ {
struct buffer_head *bh, **group_desc; struct buffer_head *bh, **group_desc;
@ -4609,44 +4653,9 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
/* Warn if metadata_csum and gdt_csum are both set. */ err = ext4_init_metadata_csum(sb, es);
if (ext4_has_feature_metadata_csum(sb) && if (err)
ext4_has_feature_gdt_csum(sb))
ext4_warning(sb, "metadata_csum and uninit_bg are "
"redundant flags; please run fsck.");
/* Check for a known checksum algorithm */
if (!ext4_verify_csum_type(sb, es)) {
ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
"unknown checksum algorithm.");
goto failed_mount; goto failed_mount;
}
ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
ext4_orphan_file_block_trigger);
/* Load the checksum driver */
sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
if (IS_ERR(sbi->s_chksum_driver)) {
ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
ret = PTR_ERR(sbi->s_chksum_driver);
sbi->s_chksum_driver = NULL;
goto failed_mount;
}
/* Check superblock checksum */
if (!ext4_superblock_csum_verify(sb, es)) {
ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
"invalid superblock checksum. Run e2fsck?");
ret = -EFSBADCRC;
goto failed_mount;
}
/* Precompute checksum seed for all metadata */
if (ext4_has_feature_csum_seed(sb))
sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
sizeof(es->s_uuid));
ext4_set_def_opts(sb, es); ext4_set_def_opts(sb, es);