mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 21:38:32 +08:00
Btrfs: Block sized tree extents and extent deletion
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
David Woodhouse
parent
5c680ed620
commit
9a8dd1502d
247
fs/btrfs/ctree.c
247
fs/btrfs/ctree.c
@ -8,9 +8,12 @@
|
||||
#define SEARCH_READ 0
|
||||
#define SEARCH_WRITE 1
|
||||
|
||||
static int refill_alloc_extent(struct ctree_root *root);
|
||||
#define CTREE_EXTENT_PENDING 0
|
||||
|
||||
int split_node(struct ctree_root *root, struct ctree_path *path, int level);
|
||||
int split_leaf(struct ctree_root *root, struct ctree_path *path, int data_size);
|
||||
struct tree_buffer *alloc_free_block(struct ctree_root *root);
|
||||
int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks);
|
||||
|
||||
static inline void init_path(struct ctree_path *p)
|
||||
{
|
||||
@ -682,8 +685,6 @@ int insert_item(struct ctree_root *root, struct key *key,
|
||||
unsigned int data_end;
|
||||
struct ctree_path path;
|
||||
|
||||
refill_alloc_extent(root);
|
||||
|
||||
/* create a root if there isn't one */
|
||||
if (!root->node)
|
||||
BUG();
|
||||
@ -756,6 +757,7 @@ int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
|
||||
struct tree_buffer *t;
|
||||
struct node *node;
|
||||
int nritems;
|
||||
u64 blocknr;
|
||||
|
||||
while(1) {
|
||||
t = path->nodes[level];
|
||||
@ -774,6 +776,7 @@ int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
|
||||
}
|
||||
node->header.nritems--;
|
||||
write_tree_block(root, t);
|
||||
blocknr = t->blocknr;
|
||||
if (node->header.nritems != 0) {
|
||||
int tslot;
|
||||
if (slot == 0)
|
||||
@ -799,6 +802,7 @@ int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
|
||||
break;
|
||||
}
|
||||
level++;
|
||||
free_extent(root, blocknr, 1);
|
||||
if (!path->nodes[level])
|
||||
BUG();
|
||||
}
|
||||
@ -841,8 +845,10 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
|
||||
if (leaf_buf == root->node) {
|
||||
leaf->header.flags = node_level(0);
|
||||
write_tree_block(root, leaf_buf);
|
||||
} else
|
||||
} else {
|
||||
del_ptr(root, path, 1);
|
||||
free_extent(root, leaf_buf->blocknr, 1);
|
||||
}
|
||||
} else {
|
||||
if (slot == 0)
|
||||
fixup_low_keys(root, path, &leaf->items[0].key, 1);
|
||||
@ -867,6 +873,72 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int del_pending_extents(struct ctree_root *extent_root)
|
||||
{
|
||||
int ret;
|
||||
struct key key;
|
||||
struct tree_buffer *gang[4];
|
||||
int i;
|
||||
struct ctree_path path;
|
||||
|
||||
while(1) {
|
||||
ret = radix_tree_gang_lookup_tag(&extent_root->cache_radix,
|
||||
(void **)gang, 0, ARRAY_SIZE(gang),
|
||||
CTREE_EXTENT_PENDING);
|
||||
if (!ret)
|
||||
break;
|
||||
for (i = 0; i < ret; i++) {
|
||||
key.objectid = gang[i]->blocknr;
|
||||
key.flags = 0;
|
||||
key.offset = 1;
|
||||
init_path(&path);
|
||||
ret = search_slot(extent_root, &key, &path, 0);
|
||||
if (ret) {
|
||||
BUG();
|
||||
// FIXME undo it and return sane
|
||||
return ret;
|
||||
}
|
||||
ret = del_item(extent_root, &path);
|
||||
if (ret) {
|
||||
BUG();
|
||||
return ret;
|
||||
}
|
||||
release_path(extent_root, &path);
|
||||
radix_tree_tag_clear(&extent_root->cache_radix, gang[i]->blocknr,
|
||||
CTREE_EXTENT_PENDING);
|
||||
tree_block_release(extent_root, gang[i]);
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks)
|
||||
{
|
||||
struct ctree_path path;
|
||||
struct key key;
|
||||
struct ctree_root *extent_root = root->extent_root;
|
||||
struct tree_buffer *t;
|
||||
int pending_ret;
|
||||
int ret;
|
||||
|
||||
key.objectid = blocknr;
|
||||
key.flags = 0;
|
||||
key.offset = num_blocks;
|
||||
if (root == extent_root) {
|
||||
t = read_tree_block(root, key.objectid);
|
||||
radix_tree_tag_set(&root->cache_radix, key.objectid, CTREE_EXTENT_PENDING);
|
||||
return 0;
|
||||
}
|
||||
init_path(&path);
|
||||
ret = search_slot(extent_root, &key, &path, 0);
|
||||
if (ret)
|
||||
BUG();
|
||||
ret = del_item(extent_root, &path);
|
||||
release_path(extent_root, &path);
|
||||
pending_ret = del_pending_extents(root->extent_root);
|
||||
return ret ? ret : pending_ret;
|
||||
}
|
||||
|
||||
int next_leaf(struct ctree_root *root, struct ctree_path *path)
|
||||
{
|
||||
int slot;
|
||||
@ -904,8 +976,8 @@ int next_leaf(struct ctree_root *root, struct ctree_path *path)
|
||||
return 0;
|
||||
}
|
||||
|
||||
int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
|
||||
u64 search_end, u64 owner, struct key *ins)
|
||||
int find_free_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
|
||||
u64 search_end, struct key *ins)
|
||||
{
|
||||
struct ctree_path path;
|
||||
struct key *key;
|
||||
@ -915,15 +987,13 @@ int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
|
||||
u64 last_block;
|
||||
int start_found = 0;
|
||||
struct leaf *l;
|
||||
struct extent_item extent_item;
|
||||
struct ctree_root * root = orig_root->extent_root;
|
||||
|
||||
init_path(&path);
|
||||
ins->objectid = search_start;
|
||||
ins->offset = 0;
|
||||
ins->flags = 0;
|
||||
|
||||
ret = search_slot(root, ins, &path, sizeof(struct extent_item));
|
||||
ret = search_slot(root, ins, &path, 0);
|
||||
while (1) {
|
||||
l = &path.nodes[0]->leaf;
|
||||
slot = path.slots[0];
|
||||
@ -938,6 +1008,7 @@ int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
|
||||
ins->objectid = search_start;
|
||||
ins->offset = num_blocks;
|
||||
hole_size = search_end - search_start;
|
||||
start_found = 1;
|
||||
goto insert;
|
||||
}
|
||||
ins->objectid = last_block;
|
||||
@ -956,51 +1027,119 @@ int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
|
||||
} else
|
||||
start_found = 1;
|
||||
last_block = key->objectid + key->offset;
|
||||
insert_failed:
|
||||
path.slots[0]++;
|
||||
}
|
||||
// FIXME -ENOSPC
|
||||
insert:
|
||||
release_path(root, &path);
|
||||
extent_item.refs = 1;
|
||||
extent_item.owner = owner;
|
||||
if (root == orig_root && root->reserve_extent->num_blocks == 0) {
|
||||
root->reserve_extent->blocknr = ins->objectid;
|
||||
root->reserve_extent->num_blocks = ins->offset;
|
||||
root->reserve_extent->num_used = 0;
|
||||
if (orig_root->extent_root == orig_root) {
|
||||
BUG_ON(num_blocks != 1);
|
||||
if ((root->current_insert.objectid <= ins->objectid &&
|
||||
root->current_insert.objectid + root->current_insert.offset >
|
||||
ins->objectid) ||
|
||||
(root->current_insert.objectid > ins->objectid &&
|
||||
root->current_insert.objectid <= ins->objectid + ins->offset) ||
|
||||
radix_tree_tag_get(&root->cache_radix, ins->objectid,
|
||||
CTREE_EXTENT_PENDING)) {
|
||||
last_block = ins->objectid + 1;
|
||||
search_start = last_block;
|
||||
goto insert_failed;
|
||||
}
|
||||
}
|
||||
ret = insert_item(root->extent_root, ins, &extent_item, sizeof(extent_item));
|
||||
return ret;
|
||||
release_path(root, &path);
|
||||
if (ins->offset != 1)
|
||||
BUG();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int refill_alloc_extent(struct ctree_root *root)
|
||||
static int insert_pending_extents(struct ctree_root *extent_root)
|
||||
{
|
||||
struct alloc_extent *ae = root->alloc_extent;
|
||||
struct key key;
|
||||
int ret;
|
||||
int min_blocks = MAX_LEVEL * 2;
|
||||
struct key key;
|
||||
struct extent_item item;
|
||||
struct tree_buffer *gang[4];
|
||||
int i;
|
||||
|
||||
if (ae->num_blocks > ae->num_used && ae->num_blocks - ae->num_used >
|
||||
min_blocks)
|
||||
return 0;
|
||||
ae = root->reserve_extent;
|
||||
if (ae->num_blocks > ae->num_used) {
|
||||
if (root->alloc_extent->num_blocks == 0) {
|
||||
/* we should swap reserve/alloc_extent when alloc
|
||||
* fills up
|
||||
*/
|
||||
BUG();
|
||||
// FIXME -ENOSPC
|
||||
item.refs = 1;
|
||||
item.owner = extent_root->node->node.header.parentid;
|
||||
while(1) {
|
||||
ret = radix_tree_gang_lookup_tag(&extent_root->cache_radix,
|
||||
(void **)gang, 0, ARRAY_SIZE(gang),
|
||||
CTREE_EXTENT_PENDING);
|
||||
if (!ret)
|
||||
break;
|
||||
for (i = 0; i < ret; i++) {
|
||||
key.objectid = gang[i]->blocknr;
|
||||
key.flags = 0;
|
||||
key.offset = 1;
|
||||
ret = insert_item(extent_root, &key, &item, sizeof(item));
|
||||
if (ret) {
|
||||
BUG();
|
||||
// FIXME undo it and return sane
|
||||
return ret;
|
||||
}
|
||||
radix_tree_tag_clear(&extent_root->cache_radix, gang[i]->blocknr,
|
||||
CTREE_EXTENT_PENDING);
|
||||
tree_block_release(extent_root, gang[i]);
|
||||
}
|
||||
if (ae->num_blocks - ae->num_used < min_blocks)
|
||||
BUG();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int alloc_extent(struct ctree_root *root, u64 num_blocks, u64 search_start,
|
||||
u64 search_end, u64 owner, struct key *ins, struct tree_buffer **buf)
|
||||
{
|
||||
int ret;
|
||||
int pending_ret;
|
||||
struct extent_item extent_item;
|
||||
|
||||
extent_item.refs = 1;
|
||||
extent_item.owner = owner;
|
||||
|
||||
ret = find_free_extent(root, num_blocks, search_start, search_end, ins);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (root != root->extent_root) {
|
||||
memcpy(&root->extent_root->current_insert, ins, sizeof(*ins));
|
||||
ret = insert_item(root->extent_root, ins, &extent_item, sizeof(extent_item));
|
||||
memset(&root->extent_root->current_insert, 0, sizeof(struct key));
|
||||
pending_ret = insert_pending_extents(root->extent_root);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (pending_ret)
|
||||
return pending_ret;
|
||||
*buf = find_tree_block(root, ins->objectid);
|
||||
return 0;
|
||||
}
|
||||
ret = alloc_extent(root,
|
||||
min_blocks * 2, 0, (unsigned long)-1,
|
||||
root->node->node.header.parentid, &key);
|
||||
ae->blocknr = key.objectid;
|
||||
ae->num_blocks = key.offset;
|
||||
ae->num_used = 0;
|
||||
return ret;
|
||||
/* we're allocating an extent for the extent tree, don't recurse */
|
||||
BUG_ON(ins->offset != 1);
|
||||
*buf = find_tree_block(root, ins->objectid);
|
||||
BUG_ON(!*buf);
|
||||
radix_tree_tag_set(&root->cache_radix, ins->objectid, CTREE_EXTENT_PENDING);
|
||||
(*buf)->count++;
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
||||
struct tree_buffer *alloc_free_block(struct ctree_root *root)
|
||||
{
|
||||
struct key ins;
|
||||
int ret;
|
||||
struct tree_buffer *buf = NULL;
|
||||
|
||||
ret = alloc_extent(root, 1, 0, (unsigned long)-1, root->node->node.header.parentid,
|
||||
&ins, &buf);
|
||||
|
||||
if (ret) {
|
||||
BUG();
|
||||
return NULL;
|
||||
}
|
||||
if (root != root->extent_root)
|
||||
BUG_ON(radix_tree_tag_get(&root->extent_root->cache_radix, buf->blocknr,
|
||||
CTREE_EXTENT_PENDING));
|
||||
return buf;
|
||||
}
|
||||
|
||||
void print_leaf(struct leaf *l)
|
||||
@ -1096,6 +1235,7 @@ int main() {
|
||||
print_tree(root, root->node);
|
||||
printf("map tree\n");
|
||||
print_tree(root->extent_root, root->extent_root->node);
|
||||
fflush(stdout);
|
||||
|
||||
srand(55);
|
||||
for (i = 0; i < run_size; i++) {
|
||||
@ -1111,12 +1251,6 @@ int main() {
|
||||
if (!ret)
|
||||
tree_size++;
|
||||
}
|
||||
printf("root used: %lu\n", root->alloc_extent->num_used);
|
||||
printf("root tree\n");
|
||||
// print_tree(root, root->node);
|
||||
printf("map tree\n");
|
||||
printf("map used: %lu\n", root->extent_root->alloc_extent->num_used);
|
||||
// print_tree(root->extent_root, root->extent_root->node);
|
||||
write_ctree_super(root, &super);
|
||||
close_ctree(root);
|
||||
|
||||
@ -1167,12 +1301,27 @@ int main() {
|
||||
ret = insert_item(root, &ins, buf, strlen(buf));
|
||||
if (!ret)
|
||||
tree_size++;
|
||||
if (i >= 5) {
|
||||
struct key ugh;
|
||||
ugh.objectid = 5;
|
||||
ugh.flags = 0;
|
||||
ugh.offset = 0;
|
||||
init_path(&path);
|
||||
ret = search_slot(root, &ugh, &path, 0);
|
||||
if (ret) {
|
||||
print_tree(root, root->node);
|
||||
printf("unable to find 5 %d\n", num);
|
||||
exit(1);
|
||||
}
|
||||
release_path(root, &path);
|
||||
|
||||
}
|
||||
}
|
||||
write_ctree_super(root, &super);
|
||||
close_ctree(root);
|
||||
root = open_ctree("dbfile", &super);
|
||||
printf("starting search2\n");
|
||||
srand(128);
|
||||
printf("starting search2\n");
|
||||
for (i = 0; i < run_size; i++) {
|
||||
num = next_key(i, max_key);
|
||||
ins.objectid = num;
|
||||
@ -1219,5 +1368,7 @@ int main() {
|
||||
write_ctree_super(root, &super);
|
||||
close_ctree(root);
|
||||
printf("tree size is now %d\n", tree_size);
|
||||
printf("map tree\n");
|
||||
print_tree(root->extent_root, root->extent_root->node);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -28,21 +28,12 @@ struct header {
|
||||
|
||||
struct tree_buffer;
|
||||
|
||||
struct alloc_extent {
|
||||
u64 blocknr;
|
||||
u64 num_blocks;
|
||||
u64 num_used;
|
||||
} __attribute__ ((__packed__));
|
||||
|
||||
struct ctree_root {
|
||||
struct tree_buffer *node;
|
||||
struct ctree_root *extent_root;
|
||||
struct alloc_extent *alloc_extent;
|
||||
struct alloc_extent *reserve_extent;
|
||||
struct key current_insert;
|
||||
int fp;
|
||||
struct radix_tree_root cache_radix;
|
||||
struct alloc_extent ai1;
|
||||
struct alloc_extent ai2;
|
||||
};
|
||||
|
||||
struct ctree_root_info {
|
||||
@ -52,8 +43,6 @@ struct ctree_root_info {
|
||||
u64 tree_root; /* the tree root */
|
||||
u32 csum;
|
||||
u32 ham;
|
||||
struct alloc_extent alloc_extent;
|
||||
struct alloc_extent reserve_extent;
|
||||
u64 snapuuid[2]; /* root specific uuid */
|
||||
} __attribute__ ((__packed__));
|
||||
|
||||
|
||||
@ -12,33 +12,13 @@
|
||||
|
||||
static int allocated_blocks = 0;
|
||||
|
||||
static int get_free_block(struct ctree_root *root, u64 *block)
|
||||
static int check_tree_block(struct ctree_root *root, struct tree_buffer *buf)
|
||||
{
|
||||
struct stat st;
|
||||
int ret = 0;
|
||||
|
||||
if (root->alloc_extent->num_used >= root->alloc_extent->num_blocks)
|
||||
return -1;
|
||||
|
||||
*block = root->alloc_extent->blocknr + root->alloc_extent->num_used;
|
||||
root->alloc_extent->num_used += 1;
|
||||
if (root->alloc_extent->num_used >= root->alloc_extent->num_blocks) {
|
||||
struct alloc_extent *ae = root->alloc_extent;
|
||||
root->alloc_extent = root->reserve_extent;
|
||||
root->reserve_extent = ae;
|
||||
ae->num_blocks = 0;
|
||||
}
|
||||
st.st_size = 0;
|
||||
ret = fstat(root->fp, &st);
|
||||
if (st.st_size < (*block + 1) * CTREE_BLOCKSIZE) {
|
||||
ret = ftruncate(root->fp,
|
||||
(*block + 1) * CTREE_BLOCKSIZE);
|
||||
if (ret) {
|
||||
perror("ftruncate");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
if (buf->blocknr != buf->node.header.blocknr)
|
||||
BUG();
|
||||
if (root->node && buf->node.header.parentid != root->node->node.header.parentid)
|
||||
BUG();
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct tree_buffer *alloc_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
@ -61,22 +41,23 @@ struct tree_buffer *alloc_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
return buf;
|
||||
}
|
||||
|
||||
struct tree_buffer *alloc_free_block(struct ctree_root *root)
|
||||
struct tree_buffer *find_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
{
|
||||
u64 free_block;
|
||||
int ret;
|
||||
struct tree_buffer * buf;
|
||||
ret = get_free_block(root, &free_block);
|
||||
if (ret) {
|
||||
BUG();
|
||||
return NULL;
|
||||
struct tree_buffer *buf;
|
||||
buf = radix_tree_lookup(&root->cache_radix, blocknr);
|
||||
if (buf) {
|
||||
buf->count++;
|
||||
} else {
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf) {
|
||||
BUG();
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
buf = alloc_tree_block(root, free_block);
|
||||
if (!buf)
|
||||
BUG();
|
||||
return buf;
|
||||
}
|
||||
|
||||
|
||||
struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
{
|
||||
loff_t offset = blocknr * CTREE_BLOCKSIZE;
|
||||
@ -86,20 +67,17 @@ struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
buf = radix_tree_lookup(&root->cache_radix, blocknr);
|
||||
if (buf) {
|
||||
buf->count++;
|
||||
goto test;
|
||||
} else {
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf)
|
||||
return NULL;
|
||||
ret = pread(root->fp, &buf->node, CTREE_BLOCKSIZE, offset);
|
||||
if (ret != CTREE_BLOCKSIZE) {
|
||||
free(buf);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf)
|
||||
return NULL;
|
||||
ret = pread(root->fp, &buf->node, CTREE_BLOCKSIZE, offset);
|
||||
if (ret != CTREE_BLOCKSIZE) {
|
||||
free(buf);
|
||||
return NULL;
|
||||
}
|
||||
test:
|
||||
if (buf->blocknr != buf->node.header.blocknr)
|
||||
BUG();
|
||||
if (root->node && buf->node.header.parentid != root->node->node.header.parentid)
|
||||
if (check_tree_block(root, buf))
|
||||
BUG();
|
||||
return buf;
|
||||
}
|
||||
@ -121,17 +99,10 @@ int write_tree_block(struct ctree_root *root, struct tree_buffer *buf)
|
||||
static int __setup_root(struct ctree_root *root, struct ctree_root *extent_root,
|
||||
struct ctree_root_info *info, int fp)
|
||||
{
|
||||
INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
|
||||
root->fp = fp;
|
||||
root->node = NULL;
|
||||
root->node = read_tree_block(root, info->tree_root);
|
||||
root->extent_root = extent_root;
|
||||
memcpy(&root->ai1, &info->alloc_extent, sizeof(info->alloc_extent));
|
||||
memcpy(&root->ai2, &info->reserve_extent, sizeof(info->reserve_extent));
|
||||
root->alloc_extent = &root->ai1;
|
||||
root->reserve_extent = &root->ai2;
|
||||
printf("setup done reading root %p, used %lu available %lu\n", root, root->alloc_extent->num_used, root->alloc_extent->num_blocks);
|
||||
printf("setup done reading root %p, reserve used %lu available %lu\n", root, root->reserve_extent->num_used, root->reserve_extent->num_blocks);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -147,6 +118,8 @@ struct ctree_root *open_ctree(char *filename, struct ctree_super_block *super)
|
||||
free(root);
|
||||
return NULL;
|
||||
}
|
||||
INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
|
||||
INIT_RADIX_TREE(&extent_root->cache_radix, GFP_KERNEL);
|
||||
ret = pread(fp, super, sizeof(struct ctree_super_block),
|
||||
CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
|
||||
if (ret == 0 || super->root_info.tree_root == 0) {
|
||||
@ -168,8 +141,6 @@ struct ctree_root *open_ctree(char *filename, struct ctree_super_block *super)
|
||||
static int __update_root(struct ctree_root *root, struct ctree_root_info *info)
|
||||
{
|
||||
info->tree_root = root->node->blocknr;
|
||||
memcpy(&info->alloc_extent, root->alloc_extent, sizeof(struct alloc_extent));
|
||||
memcpy(&info->reserve_extent, root->reserve_extent, sizeof(struct alloc_extent));
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -201,6 +172,7 @@ int close_ctree(struct ctree_root *root)
|
||||
void tree_block_release(struct ctree_root *root, struct tree_buffer *buf)
|
||||
{
|
||||
buf->count--;
|
||||
write_tree_block(root, buf);
|
||||
if (buf->count < 0)
|
||||
BUG();
|
||||
if (buf->count == 0) {
|
||||
|
||||
@ -11,11 +11,11 @@ struct tree_buffer {
|
||||
};
|
||||
|
||||
struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr);
|
||||
struct tree_buffer *find_tree_block(struct ctree_root *root, u64 blocknr);
|
||||
int write_tree_block(struct ctree_root *root, struct tree_buffer *buf);
|
||||
struct ctree_root *open_ctree(char *filename, struct ctree_super_block *s);
|
||||
int close_ctree(struct ctree_root *root);
|
||||
void tree_block_release(struct ctree_root *root, struct tree_buffer *buf);
|
||||
struct tree_buffer *alloc_free_block(struct ctree_root *root);
|
||||
int write_ctree_super(struct ctree_root *root, struct ctree_super_block *s);
|
||||
int mkfs(int fd);
|
||||
|
||||
|
||||
@ -23,17 +23,10 @@ int mkfs(int fd)
|
||||
info[0].blocknr = 16;
|
||||
info[0].objectid = 1;
|
||||
info[0].tree_root = 17;
|
||||
info[0].alloc_extent.blocknr = 0;
|
||||
info[0].alloc_extent.num_blocks = 64;
|
||||
/* 0-17 are used (inclusive) */
|
||||
info[0].alloc_extent.num_used = 18;
|
||||
|
||||
info[1].blocknr = 16;
|
||||
info[1].objectid = 2;
|
||||
info[1].tree_root = 64;
|
||||
info[1].alloc_extent.blocknr = 64;
|
||||
info[1].alloc_extent.num_blocks = 64;
|
||||
info[1].alloc_extent.num_used = 1;
|
||||
info[1].tree_root = 18;
|
||||
ret = pwrite(fd, info, sizeof(info),
|
||||
CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
|
||||
if (ret != sizeof(info))
|
||||
@ -48,24 +41,36 @@ int mkfs(int fd)
|
||||
return -1;
|
||||
|
||||
empty_leaf.header.parentid = 2;
|
||||
empty_leaf.header.blocknr = 64;
|
||||
empty_leaf.header.nritems = 2;
|
||||
empty_leaf.header.blocknr = 18;
|
||||
empty_leaf.header.nritems = 3;
|
||||
|
||||
/* item1, reserve blocks 0-16 */
|
||||
item.key.objectid = 0;
|
||||
item.key.offset = 64;
|
||||
item.key.offset = 17;
|
||||
item.key.flags = 0;
|
||||
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item);
|
||||
item.size = sizeof(struct extent_item);
|
||||
extent_item.refs = 1;
|
||||
extent_item.owner = 1;
|
||||
extent_item.owner = 0;
|
||||
memcpy(empty_leaf.items, &item, sizeof(item));
|
||||
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
||||
item.key.objectid = 64;
|
||||
item.key.offset = 64;
|
||||
|
||||
/* item2, give block 17 to the root */
|
||||
item.key.objectid = 17;
|
||||
item.key.offset = 1;
|
||||
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 2;
|
||||
extent_item.owner = 2;
|
||||
extent_item.owner = 1;
|
||||
memcpy(empty_leaf.items + 1, &item, sizeof(item));
|
||||
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
||||
ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 64 * CTREE_BLOCKSIZE);
|
||||
|
||||
/* item3, give block 18 for the extent root */
|
||||
item.key.objectid = 18;
|
||||
item.key.offset = 1;
|
||||
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 3;
|
||||
extent_item.owner = 2;
|
||||
memcpy(empty_leaf.items + 2, &item, sizeof(item));
|
||||
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
||||
ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * CTREE_BLOCKSIZE);
|
||||
if (ret != sizeof(empty_leaf))
|
||||
return -1;
|
||||
return 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user