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Fix on-disk inode checksum calculation logic.

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Reviewed by:    pfg
MFC after:      3 months

Differential Revision:    https://reviews.freebsd.org/D15395
This commit is contained in:
Fedor Uporov 2018-05-13 19:29:35 +00:00
parent e06e5241a0
commit c4aa9a026d
2 changed files with 40 additions and 29 deletions
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60
sys/fs/ext2fs/ext2_csum.c
View File

@ -535,28 +535,41 @@ static uint32_t
ext2_ei_csum(struct inode *ip, struct ext2fs_dinode *ei)
{
struct m_ext2fs *fs;
uint16_t old_hi;
uint32_t inum, gen, crc;
uint32_t inode_csum_seed, inum, gen, crc;
uint16_t dummy_csum = 0;
unsigned int offset, csum_size;
fs = ip->i_e2fs;
ei->e2di_chksum_lo = 0;
if ((EXT2_INODE_SIZE(ip->i_e2fs) > E2FS_REV0_INODE_SIZE &&
ei->e2di_extra_isize >= EXT2_INODE_CSUM_HI_EXTRA_END)) {
old_hi = ei->e2di_chksum_hi;
ei->e2di_chksum_hi = 0;
}
offset = offsetof(struct ext2fs_dinode, e2di_chksum_lo);
csum_size = sizeof(dummy_csum);
inum = ip->i_number;
gen = ip->i_gen;
crc = calculate_crc32c(fs->e2fs_csum_seed,
(uint8_t *)&inum, sizeof(inum));
inode_csum_seed = calculate_crc32c(crc,
(uint8_t *)&gen, sizeof(gen));
crc = calculate_crc32c(fs->e2fs_csum_seed, (uint8_t *)&inum, sizeof(inum));
crc = calculate_crc32c(crc, (uint8_t *)&gen, sizeof(gen));
crc = calculate_crc32c(crc, (uint8_t *)ei, fs->e2fs->e2fs_inode_size);
crc = calculate_crc32c(inode_csum_seed, (uint8_t *)ei, offset);
crc = calculate_crc32c(crc, (uint8_t *)&dummy_csum, csum_size);
offset += csum_size;
crc = calculate_crc32c(crc, (uint8_t *)ei + offset,
E2FS_REV0_INODE_SIZE - offset);
if ((EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE &&
ei->e2di_extra_isize >= EXT2_INODE_CSUM_HI_EXTRA_END))
ei->e2di_chksum_hi = old_hi;
if (EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE) {
offset = offsetof(struct ext2fs_dinode, e2di_chksum_hi);
crc = calculate_crc32c(crc, (uint8_t *)ei +
E2FS_REV0_INODE_SIZE, offset - E2FS_REV0_INODE_SIZE);
if ((EXT2_INODE_SIZE(ip->i_e2fs) > E2FS_REV0_INODE_SIZE &&
ei->e2di_extra_isize >= EXT2_INODE_CSUM_HI_EXTRA_END)) {
crc = calculate_crc32c(crc, (uint8_t *)&dummy_csum,
csum_size);
offset += csum_size;
}
crc = calculate_crc32c(crc, (uint8_t *)ei + offset,
EXT2_INODE_SIZE(fs) - offset);
}
return (crc);
}
@ -573,10 +586,6 @@ ext2_ei_csum_verify(struct inode *ip, struct ext2fs_dinode *ei)
if (!EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
return (0);
/* Check case, when dinode was not initialized */
if (!memcmp(ei, &ei_zero, sizeof(struct ext2fs_dinode)))
return (0);
provided = ei->e2di_chksum_lo;
calculated = ext2_ei_csum(ip, ei);
@ -587,8 +596,17 @@ ext2_ei_csum_verify(struct inode *ip, struct ext2fs_dinode *ei)
} else
calculated &= 0xFFFF;
if (provided != calculated)
if (provided != calculated) {
/*
* If it is first time used dinode,
* it is expected that it will be zeroed
* and we will not return checksum error in this case.
*/
if (!memcmp(ei, &ei_zero, sizeof(struct ext2fs_dinode)))
return (0);
return (EIO);
}
return (0);
}

9
sys/fs/ext2fs/ext2_inode_cnv.c
View File

@ -92,10 +92,7 @@ ext2_print_inode(struct inode *in)
int
ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
{
struct m_ext2fs *fs;
const static struct ext2fs_dinode ei_zero;
fs = ip->i_e2fs;
ip->i_nlink = ei->e2di_nlink;
/*
* Godmar thinks - if the link count is zero, then the inode is
@ -139,11 +136,7 @@ ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks));
if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM) &&
memcmp(ei, &ei_zero, EXT2_INODE_SIZE(fs)))
return (ext2_ei_csum_verify(ip, ei));
return (0);
return (ext2_ei_csum_verify(ip, ei));
}
/*