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btrfs-progs
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early support for multiple devices

This commit is contained in:
Chris Mason 2007-04-11 13:57:55 -04:00 committed by David Woodhouse
parent 6d9ce71c81
commit d23ea8706c
7 changed files with 141 additions and 24 deletions
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2
Makefile
View File

@ -42,6 +42,6 @@ quick-test: $(objects) quick-test.o
$(objects): $(headers)
clean :
rm debug-tree tester *.o
rm debug-tree mkfs.btrfs btrfsctl *.o

69
ctree.h
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@ -9,10 +9,11 @@ struct btrfs_trans_handle;
#define BTRFS_MAGIC "_BtRfS_M"
#define BTRFS_ROOT_TREE_OBJECTID 1ULL
#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
#define BTRFS_FS_TREE_OBJECTID 3ULL
#define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
#define BTRFS_FIRST_FREE_OBJECTID 5ULL
#define BTRFS_DEV_TREE_OBJECTID 2ULL
#define BTRFS_EXTENT_TREE_OBJECTID 3ULL
#define BTRFS_FS_TREE_OBJECTID 4ULL
#define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
#define BTRFS_FIRST_FREE_OBJECTID 6ULL
/*
* we can actually store much bigger names, but lets not confuse the rest
@ -86,6 +87,10 @@ struct btrfs_super_block {
__le64 total_blocks;
__le64 blocks_used;
__le64 root_dir_objectid;
/* fields below here vary with the underlying disk */
__le64 device_block_start;
__le64 device_num_blocks;
__le64 device_root;
} __attribute__ ((__packed__));
/*
@ -219,10 +224,15 @@ struct btrfs_csum_item {
u8 csum[BTRFS_CSUM_SIZE];
} __attribute__ ((__packed__));
struct btrfs_device_item {
__le16 pathlen;
} __attribute__ ((__packed__));
struct btrfs_fs_info {
struct btrfs_root *fs_root;
struct btrfs_root *extent_root;
struct btrfs_root *tree_root;
struct btrfs_root *dev_root;
struct btrfs_key current_insert;
struct btrfs_key last_insert;
struct radix_tree_root cache_radix;
@ -300,11 +310,16 @@ struct btrfs_root {
*/
#define BTRFS_EXTENT_ITEM_KEY 8
/*
* dev items list the devices that make up the FS
*/
#define BTRFS_DEV_ITEM_KEY 9
/*
* string items are for debugging. They just store a short string of
* data in the FS
*/
#define BTRFS_STRING_ITEM_KEY 9
#define BTRFS_STRING_ITEM_KEY 10
static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
{
@ -770,6 +785,39 @@ static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
s->root_dir_objectid = cpu_to_le64(val);
}
static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
{
return le64_to_cpu(s->device_block_start);
}
static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
*s, u64 val)
{
s->device_block_start = cpu_to_le64(val);
}
static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
{
return le64_to_cpu(s->device_num_blocks);
}
static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
*s, u64 val)
{
s->device_num_blocks = cpu_to_le64(val);
}
static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
{
return le64_to_cpu(s->device_root);
}
static inline void btrfs_set_super_device_root(struct btrfs_super_block
*s, u64 val)
{
s->device_root = cpu_to_le64(val);
}
static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
{
return (u8 *)l->items;
@ -837,6 +885,17 @@ static inline void btrfs_set_file_extent_num_blocks(struct
e->num_blocks = cpu_to_le64(val);
}
static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
{
return le16_to_cpu(d->pathlen);
}
static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
u16 val)
{
d->pathlen = cpu_to_le16(val);
}
/* helper function to cast into the data area of the leaf. */
#define btrfs_item_ptr(leaf, slot, type) \
((type *)(btrfs_leaf_data(leaf) + \

6
debug-tree.c
View File

@ -33,6 +33,9 @@ int main(int ac, char **av) {
printf("root tree\n");
btrfs_print_tree(root->fs_info->tree_root,
root->fs_info->tree_root->node);
printf("dev tree\n");
btrfs_print_tree(root->fs_info->dev_root,
root->fs_info->dev_root->node);
btrfs_init_path(&path);
key.offset = 0;
key.objectid = 0;
@ -63,6 +66,9 @@ int main(int ac, char **av) {
case BTRFS_ROOT_TREE_OBJECTID:
printf("root ");
break;
case BTRFS_DEV_TREE_OBJECTID:
printf("dev tree ");
break;
case BTRFS_EXTENT_TREE_OBJECTID:
printf("extent tree ");
break;

6
disk-io.c
View File

@ -273,6 +273,7 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
int ret;
@ -286,6 +287,7 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
fs_info->fs_root = root;
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->dev_root = dev_root;
fs_info->last_inode_alloc = 0;
fs_info->last_inode_alloc_dirid = 0;
fs_info->disk_super = super;
@ -299,6 +301,10 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
return NULL;
}
BUG_ON(ret < 0);
__setup_root(super, dev_root, fs_info, BTRFS_DEV_TREE_OBJECTID, fp);
dev_root->node = read_tree_block(dev_root,
btrfs_super_device_root(super));
__setup_root(super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID, fp);
tree_root->node = read_tree_block(tree_root, btrfs_super_root(super));
BUG_ON(!tree_root->node);

2
disk-io.h
View File

@ -29,8 +29,6 @@ int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s);
void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf);
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_super_block *s);
int mkfs(int fd, u64 num_blocks, u32 blocksize);
#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
#endif

72
mkfs.c
View File

@ -99,7 +99,7 @@ err:
return ret;
}
int mkfs(int fd, u64 num_blocks, u32 blocksize)
int mkfs(int fd, char *pathname, u64 num_blocks, u32 blocksize)
{
struct btrfs_super_block super;
struct btrfs_leaf *empty_leaf;
@ -107,10 +107,13 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
struct btrfs_item item;
struct btrfs_extent_item extent_item;
struct btrfs_inode_item *inode_item;
struct btrfs_device_item dev_item;
char *block;
int ret;
u32 itemoff;
u32 start_block = BTRFS_SUPER_INFO_OFFSET / blocksize;
u16 item_size;
btrfs_set_super_generation(&super, 1);
btrfs_set_super_blocknr(&super, start_block);
btrfs_set_super_root(&super, start_block + 1);
@ -118,6 +121,9 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
btrfs_set_super_blocksize(&super, blocksize);
btrfs_set_super_total_blocks(&super, num_blocks);
btrfs_set_super_blocks_used(&super, start_block + 4);
btrfs_set_super_device_block_start(&super, 0);
btrfs_set_super_device_num_blocks(&super, num_blocks);
btrfs_set_super_device_root(&super, start_block + 2);
uuid_generate(super.fsid);
block = malloc(blocksize);
@ -146,20 +152,21 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
btrfs_set_root_dirid(&root_item, 0);
btrfs_set_root_blocknr(&root_item, start_block + 2);
btrfs_set_root_refs(&root_item, 1);
itemoff = __BTRFS_LEAF_DATA_SIZE(blocksize) - sizeof(root_item);
btrfs_set_item_offset(&item, itemoff);
btrfs_set_item_size(&item, sizeof(root_item));
btrfs_set_disk_key_objectid(&item.key, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_disk_key_offset(&item.key, 0);
btrfs_set_disk_key_flags(&item.key, 0);
btrfs_set_item_size(&item, sizeof(root_item));
btrfs_set_disk_key_type(&item.key, BTRFS_ROOT_ITEM_KEY);
itemoff = __BTRFS_LEAF_DATA_SIZE(blocksize) - sizeof(root_item);
btrfs_set_root_blocknr(&root_item, start_block + 3);
btrfs_set_item_offset(&item, itemoff);
btrfs_set_disk_key_objectid(&item.key, BTRFS_EXTENT_TREE_OBJECTID);
memcpy(empty_leaf->items, &item, sizeof(item));
memcpy(btrfs_leaf_data(empty_leaf) + itemoff,
&root_item, sizeof(root_item));
btrfs_set_root_blocknr(&root_item, start_block + 3);
btrfs_set_root_blocknr(&root_item, start_block + 4);
itemoff = itemoff - sizeof(root_item);
btrfs_set_item_offset(&item, itemoff);
btrfs_set_disk_key_objectid(&item.key, BTRFS_FS_TREE_OBJECTID);
@ -168,9 +175,31 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
&root_item, sizeof(root_item));
ret = pwrite(fd, empty_leaf, blocksize, (start_block + 1) * blocksize);
/* create the items for the extent tree */
/* create the item for the dev tree */
btrfs_set_header_blocknr(&empty_leaf->header, start_block + 2);
btrfs_set_header_nritems(&empty_leaf->header, 4);
btrfs_set_header_nritems(&empty_leaf->header, 1);
btrfs_set_disk_key_objectid(&item.key, 0);
btrfs_set_disk_key_offset(&item.key, num_blocks);
btrfs_set_disk_key_flags(&item.key, 0);
btrfs_set_disk_key_type(&item.key, BTRFS_DEV_ITEM_KEY);
item_size = sizeof(struct btrfs_device_item) + strlen(pathname);
itemoff = __BTRFS_LEAF_DATA_SIZE(blocksize) - item_size;
btrfs_set_item_offset(&item, itemoff);
btrfs_set_item_size(&item, item_size);
btrfs_set_device_pathlen(&dev_item, strlen(pathname));
memcpy(empty_leaf->items, &item, sizeof(item));
memcpy(btrfs_leaf_data(empty_leaf) + itemoff, &dev_item,
sizeof(dev_item));
memcpy(btrfs_leaf_data(empty_leaf) + itemoff + sizeof(dev_item),
pathname, strlen(pathname));
ret = pwrite(fd, empty_leaf, blocksize, (start_block + 2) * blocksize);
if (ret != blocksize)
return -1;
/* create the items for the extent tree */
btrfs_set_header_blocknr(&empty_leaf->header, start_block + 3);
btrfs_set_header_nritems(&empty_leaf->header, 5);
/* item1, reserve blocks 0-16 */
btrfs_set_disk_key_objectid(&item.key, 0);
@ -195,7 +224,7 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
&extent_item, btrfs_item_size(&item));
/* item3, give block 18 to the extent root */
/* item3, give block 18 to the dev root */
btrfs_set_disk_key_objectid(&item.key, start_block + 2);
btrfs_set_disk_key_offset(&item.key, 1);
itemoff = itemoff - sizeof(struct btrfs_extent_item);
@ -204,7 +233,7 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
&extent_item, btrfs_item_size(&item));
/* item5, give block 19 to the FS root */
/* item4, give block 19 to the extent root */
btrfs_set_disk_key_objectid(&item.key, start_block + 3);
btrfs_set_disk_key_offset(&item.key, 1);
itemoff = itemoff - sizeof(struct btrfs_extent_item);
@ -212,14 +241,23 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
memcpy(empty_leaf->items + 3, &item, sizeof(item));
memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
&extent_item, btrfs_item_size(&item));
ret = pwrite(fd, empty_leaf, blocksize, (start_block + 2) * blocksize);
/* item5, give block 20 to the FS root */
btrfs_set_disk_key_objectid(&item.key, start_block + 4);
btrfs_set_disk_key_offset(&item.key, 1);
itemoff = itemoff - sizeof(struct btrfs_extent_item);
btrfs_set_item_offset(&item, itemoff);
memcpy(empty_leaf->items + 4, &item, sizeof(item));
memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
&extent_item, btrfs_item_size(&item));
ret = pwrite(fd, empty_leaf, blocksize, (start_block + 3) * blocksize);
if (ret != blocksize)
return -1;
/* finally create the FS root */
btrfs_set_header_blocknr(&empty_leaf->header, start_block + 3);
btrfs_set_header_blocknr(&empty_leaf->header, start_block + 4);
btrfs_set_header_nritems(&empty_leaf->header, 0);
ret = pwrite(fd, empty_leaf, blocksize, (start_block + 3) * blocksize);
ret = pwrite(fd, empty_leaf, blocksize, (start_block + 4) * blocksize);
if (ret != blocksize)
return -1;
return 0;
@ -248,6 +286,7 @@ int main(int ac, char **av)
int ret;
int i;
char *buf = malloc(4096);
char *realpath_name;
radix_tree_init();
@ -287,14 +326,15 @@ int main(int ac, char **av)
exit(1);
}
memset(buf, 0, 4096);
for(i = 0; i < 16; i++) {
for(i = 0; i < 64; i++) {
ret = write(fd, buf, 4096);
if (ret != 4096) {
fprintf(stderr, "unable to zero fill device\n");
exit(1);
}
}
ret = mkfs(fd, block_count, 4096);
realpath_name = realpath(file, NULL);
ret = mkfs(fd, realpath_name, block_count, 4096);
if (ret) {
fprintf(stderr, "error during mkfs %d\n", ret);
exit(1);

8
print-tree.c
View File

@ -13,6 +13,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
struct btrfs_extent_item *ei;
struct btrfs_root_item *ri;
struct btrfs_dir_item *di;
struct btrfs_device_item *devi;
struct btrfs_inode_item *ii;
struct btrfs_file_extent_item *fi;
char *p;
@ -85,6 +86,13 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
btrfs_file_extent_offset(fi),
btrfs_file_extent_num_blocks(fi));
break;
case BTRFS_DEV_ITEM_KEY:
devi = btrfs_item_ptr(l, i, struct btrfs_device_item);
printf("\t\tdev namelen %u name %.*s\n",
btrfs_device_pathlen(devi),
btrfs_device_pathlen(devi),
(char *)(devi + 1));
break;
case BTRFS_STRING_ITEM_KEY:
printf("\t\titem data %.*s\n", btrfs_item_size(item),
btrfs_leaf_data(l) + btrfs_item_offset(item));