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btrfs-progs: update checksumming api 

Update the checksumming API to be able to cope with more checksum types
than just CRC32C. The finalization call is merged into btrfs_csum_data.

There are some fixme's and asserts added that need to be resolved.

Co-developed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2019-09-03 17:00:41 +02:00 committed by David Sterba
parent 926e9c8e14
commit ed33908b44
8 changed files with 61 additions and 81 deletions
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21
btrfs-sb-mod.c
View File

@ -33,31 +33,24 @@ static int csum_size;
static int check_csum_superblock(void *sb)
{
u8 result[csum_size];
u32 crc = ~(u32)0;
u8 result[BTRFS_CSUM_SIZE];
u16 csum_type = btrfs_super_csum_type(sb);
crc = btrfs_csum_data(csum_type,
(char *)sb + BTRFS_CSUM_SIZE,
(u8 *)&crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(csum_type, crc, result);
btrfs_csum_data(csum_type, (char *)sb + BTRFS_CSUM_SIZE,
result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
return !memcmp(sb, &result, csum_size);
return !memcmp(sb, result, csum_size);
}
static void update_block_csum(void *block)
{
u8 result[csum_size];
u8 result[BTRFS_CSUM_SIZE];
struct btrfs_header *hdr;
u32 crc = ~(u32)0;
u16 csum_type = btrfs_super_csum_type(block);
crc = btrfs_csum_data(csum_type, (char *)block + BTRFS_CSUM_SIZE,
(u8 *)&crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_data(csum_type, (char *)block + BTRFS_CSUM_SIZE,
result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(csum_type, crc, result);
memset(block, 0, BTRFS_CSUM_SIZE);
hdr = (struct btrfs_header *)block;
memcpy(&hdr->csum, result, csum_size);

20
check/main.c
View File

@ -5620,10 +5620,10 @@ static int check_extent_csums(struct btrfs_root *root, u64 bytenr,
u64 offset = 0;
u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
char *data;
u8 *data;
unsigned long csum_offset;
u32 csum;
u32 csum_expected;
u8 result[BTRFS_CSUM_SIZE];
u8 csum_expected[BTRFS_CSUM_SIZE];
u64 read_len;
u64 data_checked = 0;
u64 tmp;
@ -5649,7 +5649,7 @@ static int check_extent_csums(struct btrfs_root *root, u64 bytenr,
for (mirror = 1; mirror <= num_copies; mirror++) {
read_len = num_bytes - offset;
/* read as much space once a time */
ret = read_extent_data(fs_info, data + offset,
ret = read_extent_data(fs_info, (char *)data + offset,
bytenr + offset, &read_len, mirror);
if (ret)
goto out;
@ -5657,24 +5657,22 @@ static int check_extent_csums(struct btrfs_root *root, u64 bytenr,
data_checked = 0;
/* verify every 4k data's checksum */
while (data_checked < read_len) {
csum = ~(u32)0;
tmp = offset + data_checked;
csum = btrfs_csum_data(csum_type,
(char *)data + tmp,
(u8 *)&csum, fs_info->sectorsize);
btrfs_csum_final(csum_type, csum, (u8 *)&csum);
btrfs_csum_data(csum_type, data + tmp,
result, fs_info->sectorsize);
csum_offset = leaf_offset +
tmp / fs_info->sectorsize * csum_size;
read_extent_buffer(eb, (char *)&csum_expected,
csum_offset, csum_size);
if (csum != csum_expected) {
if (memcmp(result, csum_expected, csum_size) != 0) {
csum_mismatch = true;
/* FIXME: format of the checksum value */
fprintf(stderr,
"mirror %d bytenr %llu csum %u expected csum %u\n",
mirror, bytenr + tmp,
csum, csum_expected);
result[0], csum_expected[0]);
}
data_checked += fs_info->sectorsize;
}

9
cmds/inspect-dump-super.c
View File

@ -38,14 +38,11 @@
static int check_csum_sblock(void *sb, int csum_size, u16 csum_type)
{
u8 result[BTRFS_CSUM_SIZE];
u32 crc = ~(u32)0;
crc = btrfs_csum_data(csum_type, (char *)sb + BTRFS_CSUM_SIZE,
(u8 *)&crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(csum_type, crc, result);
btrfs_csum_data(csum_type, (u8 *)sb + BTRFS_CSUM_SIZE,
result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
return !memcmp(sb, &result, csum_size);
return !memcmp(sb, result, csum_size);
}
static void print_sys_chunk_array(struct btrfs_super_block *sb)

12
cmds/rescue-chunk-recover.c
View File

@ -1892,7 +1892,11 @@ static int check_one_csum(int fd, u64 start, u32 len, u32 tree_csum,
{
char *data;
int ret = 0;
u32 csum_result = ~(u32)0;
u8 result[BTRFS_CSUM_SIZE];
int csum_size = 0;
u8 expected_csum[BTRFS_CSUM_SIZE];
ASSERT(0);
data = malloc(len);
if (!data)
@ -1903,9 +1907,9 @@ static int check_one_csum(int fd, u64 start, u32 len, u32 tree_csum,
goto out;
}
ret = 0;
csum_result = btrfs_csum_data(csum_type, data, (u8 *)&csum_result, len);
btrfs_csum_final(csum_type, csum_result, (u8 *)&csum_result);
if (csum_result != tree_csum)
put_unaligned_le32(tree_csum, expected_csum);
btrfs_csum_data(csum_type, (u8 *)data, result, len);
if (memcmp(result, expected_csum, csum_size) != 0)
ret = 1;
out:
free(data);

9
convert/common.c
View File

@ -62,14 +62,13 @@ static int reserve_free_space(struct cache_tree *free_tree, u64 len,
static inline int write_temp_super(int fd, struct btrfs_super_block *sb,
u64 sb_bytenr)
{
u32 crc = ~(u32)0;
u8 result[BTRFS_CSUM_SIZE];
u16 csum_type = btrfs_super_csum_type(sb);
int ret;
crc = btrfs_csum_data(csum_type, (char *)sb + BTRFS_CSUM_SIZE,
(u8 *)&crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(csum_type, crc, &sb->csum[0]);
btrfs_csum_data(csum_type, (u8 *)sb + BTRFS_CSUM_SIZE,
result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
memcpy(&sb->csum[0], result, BTRFS_CSUM_SIZE);
ret = pwrite(fd, sb, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
if (ret < BTRFS_SUPER_INFO_SIZE)
ret = (ret < 0 ? -errno : -EIO);

60
disk-io.c
View File

@ -138,26 +138,23 @@ static void print_tree_block_error(struct btrfs_fs_info *fs_info,
}
}
u32 btrfs_csum_data(u16 csum_type, char *data, u8 *seed, size_t len)
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
{
u32 crc = ~(u32)0;
memset(out, 0, BTRFS_CSUM_SIZE);
switch (csum_type) {
case BTRFS_CSUM_TYPE_CRC32:
return crc32c(*(u32*)seed, data, len);
default: /* Not reached */
return ~(u32)0;
crc = crc32c(crc, data, len);
put_unaligned_le32(~crc, out);
return 0;
default:
fprintf(stderr, "ERROR: unknown csum type: %d\n", csum_type);
ASSERT(0);
}
}
void btrfs_csum_final(u16 csum_type, u32 crc, u8 *result)
{
switch (csum_type) {
case BTRFS_CSUM_TYPE_CRC32:
put_unaligned_le32(~crc, result);
break;
default: /* Not reached */
break;
}
return -1;
}
static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
@ -165,20 +162,19 @@ static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
{
u8 result[BTRFS_CSUM_SIZE];
u32 len;
u32 crc = ~(u32)0;
len = buf->len - BTRFS_CSUM_SIZE;
crc = btrfs_csum_data(csum_type, buf->data + BTRFS_CSUM_SIZE,
(u8 *)&crc, len);
btrfs_csum_final(csum_type, crc, result);
btrfs_csum_data(csum_type, (u8 *)buf->data + BTRFS_CSUM_SIZE,
result, len);
if (verify) {
if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
/* FIXME: format */
if (!silent)
printk("checksum verify failed on %llu found %08X wanted %08X\n",
(unsigned long long)buf->start,
*((u32 *)result),
*((u32*)(char *)buf->data));
result[0],
buf->data[0]);
return 1;
}
} else {
@ -1367,7 +1363,6 @@ struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
int btrfs_check_super(struct btrfs_super_block *sb, unsigned sbflags)
{
u8 result[BTRFS_CSUM_SIZE];
u32 crc;
u16 csum_type;
int csum_size;
u8 *metadata_uuid;
@ -1388,11 +1383,8 @@ int btrfs_check_super(struct btrfs_super_block *sb, unsigned sbflags)
}
csum_size = btrfs_csum_sizes[csum_type];
crc = ~(u32)0;
crc = btrfs_csum_data(csum_type,(char *)sb + BTRFS_CSUM_SIZE,
(u8 *)&crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(csum_type, crc, result);
btrfs_csum_data(csum_type, (u8 *)sb + BTRFS_CSUM_SIZE,
result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
if (memcmp(result, sb->csum, csum_size)) {
error("superblock checksum mismatch");
@ -1628,7 +1620,7 @@ static int write_dev_supers(struct btrfs_fs_info *fs_info,
struct btrfs_device *device)
{
u64 bytenr;
u32 crc;
u8 result[BTRFS_CSUM_SIZE];
int i, ret;
u16 csum_type = btrfs_super_csum_type(sb);
@ -1645,10 +1637,9 @@ static int write_dev_supers(struct btrfs_fs_info *fs_info,
}
if (fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
btrfs_set_super_bytenr(sb, fs_info->super_bytenr);
crc = ~(u32)0;
crc = btrfs_csum_data(csum_type, (char *)sb + BTRFS_CSUM_SIZE, (u8 *)&crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(csum_type, crc, &sb->csum[0]);
btrfs_csum_data(csum_type, (u8 *)sb + BTRFS_CSUM_SIZE, result,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
memcpy(&sb->csum[0], result, BTRFS_CSUM_SIZE);
/*
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
@ -1681,10 +1672,9 @@ static int write_dev_supers(struct btrfs_fs_info *fs_info,
btrfs_set_super_bytenr(sb, bytenr);
crc = ~(u32)0;
crc = btrfs_csum_data(csum_type, (char *)sb + BTRFS_CSUM_SIZE, (u8 *)&crc,
btrfs_csum_data(csum_type, (u8 *)sb + BTRFS_CSUM_SIZE, result,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(csum_type, crc, &sb->csum[0]);
memcpy(&sb->csum[0], result, BTRFS_CSUM_SIZE);
/*
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is

3
disk-io.h
View File

@ -186,8 +186,7 @@ int btrfs_free_fs_root(struct btrfs_root *root);
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
u32 btrfs_csum_data(u16 csum_type, char *data, u8 *seed, size_t len);
void btrfs_csum_final(u16 csum_type, u32 crc, u8 *result);
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
int btrfs_open_device(struct btrfs_device *dev);
int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,

8
file-item.c
View File

@ -195,7 +195,7 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
struct btrfs_csum_item *item;
struct extent_buffer *leaf = NULL;
u64 csum_offset;
u32 csum_result = ~(u32)0;
u8 csum_result[BTRFS_CSUM_SIZE];
u32 sectorsize = root->fs_info->sectorsize;
u32 nritems;
u32 ins_size;
@ -315,14 +315,14 @@ csum:
item = (struct btrfs_csum_item *)((unsigned char *)item +
csum_offset * csum_size);
found:
csum_result = btrfs_csum_data(csum_type, data, (u8 *)&csum_result, len);
btrfs_csum_final(csum_type, csum_result, (u8 *)&csum_result);
btrfs_csum_data(csum_type, (u8 *)data, csum_result, len);
/* FIXME: does not make sense for non-crc32c */
if (csum_result == 0) {
printk("csum result is 0 for block %llu\n",
(unsigned long long)bytenr);
}
write_extent_buffer(leaf, &csum_result, (unsigned long)item,
write_extent_buffer(leaf, csum_result, (unsigned long)item,
csum_size);
btrfs_mark_buffer_dirty(path->nodes[0]);
fail: