xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Btrfs: Block sized tree extents and extent deletion

Browse Source 
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-02-23 08:38:36 -05:00
committed by David Woodhouse
parent 5c680ed620
commit 9a8dd1502d
5 changed files with 253 additions and 136 deletions
Download Patch File Download Diff File Expand all files Collapse all files

90
fs/btrfs/disk-io.c
View File

@@ -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) {