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Btrfs: change around extent-tree prealloc

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-04-25 15:52:25 -04:00 committed by David Woodhouse
parent f68cad0f9e
commit f2458e1d8c
3 changed files with 87 additions and 27 deletions
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10
fs/btrfs/ctree.h
View file

@ -244,12 +244,17 @@ struct btrfs_fs_info {
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 fs_roots_radix;
struct radix_tree_root pending_del_radix;
struct radix_tree_root pinned_radix;
struct radix_tree_root dev_radix;
u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
int extent_tree_insert_nr;
u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
int extent_tree_prealloc_nr;
u64 generation;
struct btrfs_transaction *running_transaction;
struct btrfs_super_block *disk_super;
@ -267,8 +272,7 @@ struct btrfs_fs_info {
/*
* in ram representation of the tree. extent_root is used for all allocations
* and for the extent tree extent_root root. current_insert is used
* only for the extent tree.
* and for the extent tree extent_root root.
*/
struct btrfs_root {
struct buffer_head *node;

3
fs/btrfs/disk-io.c
View file

@ -542,6 +542,8 @@ struct btrfs_root *open_ctree(struct super_block *sb)
fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
fs_info->do_barriers = 1;
fs_info->extent_tree_insert_nr = 0;
fs_info->extent_tree_prealloc_nr = 0;
BTRFS_I(fs_info->btree_inode)->root = tree_root;
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
sizeof(struct btrfs_key));
@ -555,7 +557,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
}
mutex_init(&fs_info->trans_mutex);
mutex_init(&fs_info->fs_mutex);
memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
__setup_root(sb->s_blocksize, dev_root,

101
fs/btrfs/extent-tree.c
View file

@ -169,9 +169,8 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
btrfs_set_extent_owner(&extent_item, extent_root->root_key.objectid);
for (i = 0; i < extent_root->fs_info->current_insert.flags; i++) {
ins.objectid = extent_root->fs_info->current_insert.objectid +
i;
for (i = 0; i < extent_root->fs_info->extent_tree_insert_nr; i++) {
ins.objectid = extent_root->fs_info->extent_tree_insert[i];
super_blocks_used = btrfs_super_blocks_used(info->disk_super);
btrfs_set_super_blocks_used(info->disk_super,
super_blocks_used + 1);
@ -179,7 +178,8 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
sizeof(extent_item));
BUG_ON(ret);
}
extent_root->fs_info->current_insert.offset = 0;
extent_root->fs_info->extent_tree_insert_nr = 0;
extent_root->fs_info->extent_tree_prealloc_nr = 0;
return 0;
}
@ -349,7 +349,10 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
int start_found;
struct btrfs_leaf *l;
struct btrfs_root * root = orig_root->fs_info->extent_root;
struct btrfs_fs_info *info = root->fs_info;
int total_needed = num_blocks;
int total_found = 0;
int fill_prealloc = 0;
int level;
path = btrfs_alloc_path();
@ -357,8 +360,12 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
level = btrfs_header_level(btrfs_buffer_header(root->node));
total_needed += (level + 2) * 3;
if (root->fs_info->last_insert.objectid == 0 && search_end == (u64)-1) {
if (num_blocks == 0) {
fill_prealloc = 1;
num_blocks = 1;
total_needed = min(level + 2, BTRFS_MAX_LEVEL) * 3;
}
if (info->last_insert.objectid == 0 && search_end == (u64)-1) {
struct btrfs_disk_key *last_key;
btrfs_init_path(path);
ins->objectid = (u64)-1;
@ -373,8 +380,8 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
last_key = &l->items[path->slots[0]].key;
search_start = btrfs_disk_key_objectid(last_key);
}
if (root->fs_info->last_insert.objectid > search_start)
search_start = root->fs_info->last_insert.objectid;
if (info->last_insert.objectid > search_start)
search_start = info->last_insert.objectid;
check_failed:
btrfs_init_path(path);
@ -392,6 +399,10 @@ check_failed:
l = btrfs_buffer_leaf(path->nodes[0]);
slot = path->slots[0];
if (slot >= btrfs_header_nritems(&l->header)) {
if (fill_prealloc) {
info->extent_tree_prealloc_nr = 0;
total_found = 0;
}
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;
@ -399,13 +410,13 @@ check_failed:
goto error;
if (!start_found) {
ins->objectid = search_start;
ins->offset = (u64)-1;
ins->offset = (u64)-1 - search_start;
start_found = 1;
goto check_pending;
}
ins->objectid = last_block > search_start ?
last_block : search_start;
ins->offset = (u64)-1;
ins->offset = (u64)-1 - ins->objectid;
goto check_pending;
}
btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
@ -414,7 +425,7 @@ check_failed:
if (last_block < search_start)
last_block = search_start;
hole_size = key.objectid - last_block;
if (hole_size > total_needed) {
if (hole_size > num_blocks) {
ins->objectid = last_block;
ins->offset = hole_size;
goto check_pending;
@ -433,17 +444,51 @@ check_pending:
btrfs_release_path(root, path);
BUG_ON(ins->objectid < search_start);
for (test_block = ins->objectid;
test_block < ins->objectid + total_needed; test_block++) {
if (test_radix_bit(&root->fs_info->pinned_radix,
test_block)) {
test_block < ins->objectid + num_blocks; test_block++) {
if (test_radix_bit(&info->pinned_radix, test_block)) {
search_start = test_block + 1;
goto check_failed;
}
}
BUG_ON(root->fs_info->current_insert.offset);
root->fs_info->current_insert.offset = total_needed - num_blocks;
root->fs_info->current_insert.objectid = ins->objectid + num_blocks;
root->fs_info->current_insert.flags = 0;
if (!fill_prealloc && info->extent_tree_insert_nr) {
u64 last =
info->extent_tree_insert[info->extent_tree_insert_nr - 1];
if (ins->objectid + num_blocks >
info->extent_tree_insert[0] &&
ins->objectid <= last) {
search_start = last + 1;
WARN_ON(1);
goto check_failed;
}
}
if (!fill_prealloc && info->extent_tree_prealloc_nr) {
u64 first =
info->extent_tree_prealloc[info->extent_tree_prealloc_nr - 1];
if (ins->objectid + num_blocks > first &&
ins->objectid <= info->extent_tree_prealloc[0]) {
search_start = info->extent_tree_prealloc[0] + 1;
WARN_ON(1);
goto check_failed;
}
}
if (fill_prealloc) {
int nr;
test_block = ins->objectid;
while(test_block < ins->objectid + ins->offset &&
total_found < total_needed) {
nr = total_needed - total_found - 1;
BUG_ON(nr < 0);
root->fs_info->extent_tree_prealloc[nr] =
test_block;
total_found++;
test_block++;
}
if (total_found < total_needed) {
search_start = test_block;
goto check_failed;
}
root->fs_info->extent_tree_prealloc_nr = total_found;
}
root->fs_info->last_insert.objectid = ins->objectid;
ins->offset = num_blocks;
btrfs_free_path(path);
@ -472,25 +517,35 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
struct btrfs_extent_item extent_item;
struct btrfs_key prealloc_key;
btrfs_set_extent_refs(&extent_item, 1);
btrfs_set_extent_owner(&extent_item, owner);
if (root == extent_root) {
BUG_ON(extent_root->fs_info->current_insert.offset == 0);
int nr;
BUG_ON(info->extent_tree_prealloc_nr == 0);
BUG_ON(num_blocks != 1);
BUG_ON(extent_root->fs_info->current_insert.flags ==
extent_root->fs_info->current_insert.offset);
ins->offset = 1;
ins->objectid = extent_root->fs_info->current_insert.objectid +
extent_root->fs_info->current_insert.flags++;
info->extent_tree_prealloc_nr--;
nr = info->extent_tree_prealloc_nr;
ins->objectid = info->extent_tree_prealloc[nr];
info->extent_tree_insert[info->extent_tree_insert_nr++] =
ins->objectid;
return 0;
}
/* do the real allocation */
ret = find_free_extent(trans, root, num_blocks, search_start,
search_end, ins);
if (ret)
return ret;
/* then do prealloc for the extent tree */
ret = find_free_extent(trans, root, 0, ins->objectid + ins->offset,
search_end, &prealloc_key);
if (ret)
return ret;
super_blocks_used = btrfs_super_blocks_used(info->disk_super);
btrfs_set_super_blocks_used(info->disk_super, super_blocks_used +
num_blocks);