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Retry metadata reads in the face of checksum failures

This commit is contained in:
Chris Mason 2008-04-09 16:28:12 -04:00 committed by David Woodhouse
parent 1b74adf90b
commit fd2d0af0bf
5 changed files with 76 additions and 24 deletions
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61
disk-io.c
View File

@ -38,12 +38,12 @@
static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
{
if (buf->start != btrfs_header_bytenr(buf))
BUG();
return 1;
if (memcmp_extent_buffer(buf, root->fs_info->fsid,
(unsigned long)btrfs_header_fsid(buf),
BTRFS_FSID_SIZE))
BUG();
return 1;
return 0;
}
@ -57,8 +57,8 @@ void btrfs_csum_final(u32 crc, char *result)
*(__le32 *)result = ~cpu_to_le32(crc);
}
static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify)
int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify)
{
char result[BTRFS_CRC32_SIZE];
u32 len;
@ -70,8 +70,9 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
if (verify) {
if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
printk("checksum verify failed on %llu\n",
(unsigned long long)buf->start);
printk("checksum verify failed on %llu wanted %X "
"found %X\n", (unsigned long long)buf->start,
*((int *)result), *((int *)buf));
return 1;
}
} else {
@ -112,7 +113,7 @@ int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
dev_nr = 0;
length = blocksize;
ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
bytenr, &length, &multi);
bytenr, &length, &multi, 0);
BUG_ON(ret);
device = multi->stripes[0].dev;
device->total_ios++;
@ -131,6 +132,8 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
u64 length;
struct btrfs_multi_bio *multi = NULL;
struct btrfs_device *device;
int mirror_num = 0;
int num_copies;
eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
if (!eb)
@ -141,21 +144,35 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
dev_nr = 0;
length = blocksize;
ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
eb->start, &length, &multi);
BUG_ON(ret);
device = multi->stripes[0].dev;
eb->fd = device->fd;
device->total_ios++;
eb->dev_bytenr = multi->stripes[0].physical;
ret = read_extent_from_disk(eb);
if (ret) {
free_extent_buffer(eb);
return NULL;
while (1) {
ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
eb->start, &length, &multi, mirror_num);
BUG_ON(ret);
device = multi->stripes[0].dev;
eb->fd = device->fd;
device->total_ios++;
eb->dev_bytenr = multi->stripes[0].physical;
kfree(multi);
ret = read_extent_from_disk(eb);
if (ret == 0 && check_tree_block(root, eb) == 0 &&
csum_tree_block(root, eb, 1) == 0) {
btrfs_set_buffer_uptodate(eb);
return eb;
}
num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
eb->start, eb->len);
if (num_copies == 1) {
printk("reading %Lu failed only one copy\n", eb->start);
break;
}
mirror_num++;
if (mirror_num > num_copies) {
printk("bailing at mirror %d of %d\n", mirror_num, num_copies);
break;
}
}
btrfs_set_buffer_uptodate(eb);
kfree(multi);
return eb;
free_extent_buffer(eb);
return NULL;
}
int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
@ -177,7 +194,7 @@ int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
dev_nr = 0;
length = eb->len;
ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
eb->start, &length, &multi);
eb->start, &length, &multi, 0);
while(dev_nr < multi->num_stripes) {
BUG_ON(ret);
eb->fd = multi->stripes[dev_nr].dev->fd;

2
disk-io.h
View File

@ -52,4 +52,6 @@ void btrfs_csum_final(u32 crc, char *result);
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_open_device(struct btrfs_device *dev);
int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify);
#endif

8
utils.c
View File

@ -106,6 +106,7 @@ int make_btrfs(int fd, char *device_name,
/* create the tree of root objects */
memset(buf->data, 0, leafsize);
buf->len = leafsize;
btrfs_set_header_bytenr(buf, blocks[1]);
btrfs_set_header_nritems(buf, 3);
btrfs_set_header_generation(buf, 1);
@ -165,6 +166,7 @@ int make_btrfs(int fd, char *device_name,
nritems++;
csum_tree_block(NULL, buf, 0);
ret = pwrite(fd, buf->data, leafsize, blocks[1]);
BUG_ON(ret != leafsize);
@ -229,6 +231,7 @@ int make_btrfs(int fd, char *device_name,
btrfs_set_header_bytenr(buf, blocks[2]);
btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
csum_tree_block(NULL, buf, 0);
ret = pwrite(fd, buf->data, leafsize, blocks[2]);
BUG_ON(ret != leafsize);
@ -302,6 +305,7 @@ int make_btrfs(int fd, char *device_name,
btrfs_set_header_bytenr(buf, blocks[3]);
btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
csum_tree_block(NULL, buf, 0);
ret = pwrite(fd, buf->data, leafsize, blocks[3]);
/* create the device tree */
@ -325,12 +329,14 @@ int make_btrfs(int fd, char *device_name,
btrfs_set_header_bytenr(buf, blocks[4]);
btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
csum_tree_block(NULL, buf, 0);
ret = pwrite(fd, buf->data, leafsize, blocks[4]);
/* finally create the FS root */
btrfs_set_header_bytenr(buf, blocks[5]);
btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
btrfs_set_header_nritems(buf, 0);
csum_tree_block(NULL, buf, 0);
ret = pwrite(fd, buf->data, leafsize, blocks[5]);
BUG_ON(ret != leafsize);
@ -338,6 +344,8 @@ int make_btrfs(int fd, char *device_name,
BUG_ON(sizeof(super) > sectorsize);
memset(buf->data, 0, sectorsize);
memcpy(buf->data, &super, sizeof(super));
buf->len = sectorsize;
csum_tree_block(NULL, buf, 0);
ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
BUG_ON(ret != sectorsize);

26
volumes.c
View File

@ -732,9 +732,29 @@ void btrfs_mapping_init(struct btrfs_mapping_tree *tree)
cache_tree_init(&tree->cache_tree);
}
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len)
{
struct cache_extent *ce;
struct map_lookup *map;
int ret;
u64 offset;
ce = find_first_cache_extent(&map_tree->cache_tree, logical);
BUG_ON(!ce);
BUG_ON(ce->start > logical || ce->start + ce->size < logical);
map = container_of(ce, struct map_lookup, ce);
offset = logical - ce->start;
if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
ret = map->num_stripes;
else
ret = 1;
return ret;
}
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
u64 logical, u64 *length,
struct btrfs_multi_bio **multi_ret)
struct btrfs_multi_bio **multi_ret, int mirror_num)
{
struct cache_extent *ce;
struct map_lookup *map;
@ -802,11 +822,15 @@ again:
if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
if (rw == WRITE)
multi->num_stripes = map->num_stripes;
else if (mirror_num)
stripe_index = mirror_num - 1;
else
stripe_index = stripe_nr % map->num_stripes;
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
if (rw == WRITE)
multi->num_stripes = map->num_stripes;
else if (mirror_num)
stripe_index = mirror_num - 1;
} else {
/*
* after this do_div call, stripe_nr is the number of stripes

3
volumes.h
View File

@ -85,7 +85,7 @@ int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
u64 owner, u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
u64 logical, u64 *length,
struct btrfs_multi_bio **multi_ret);
struct btrfs_multi_bio **multi_ret, int mirror_num);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
@ -104,4 +104,5 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
int btrfs_scan_one_device(int fd, const char *path,
struct btrfs_fs_devices **fs_devices_ret,
u64 *total_devs, u64 super_offset);
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
#endif