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Btrfs: allocator optimizations, truncate readahead 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-05-18 13:28:27 -04:00 committed by David Woodhouse
parent 098f59c251
commit de428b63b1
4 changed files with 129 additions and 37 deletions
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2
fs/btrfs/ctree.h
View File

@ -1081,7 +1081,7 @@ static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache
*hint, u64 search_start,
int data);
int data, int owner);
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,

12
fs/btrfs/disk-io.c
View File

@ -257,24 +257,30 @@ static struct address_space_operations btree_aops = {
int readahead_tree_block(struct btrfs_root *root, u64 blocknr)
{
struct buffer_head *bh = NULL;
int ret = 0;
bh = btrfs_find_create_tree_block(root, blocknr);
if (!bh)
return 0;
if (buffer_uptodate(bh))
if (buffer_uptodate(bh)) {
ret = 1;
goto done;
if (test_set_buffer_locked(bh))
}
if (test_set_buffer_locked(bh)) {
ret = 1;
goto done;
}
if (!buffer_uptodate(bh)) {
get_bh(bh);
bh->b_end_io = end_buffer_read_sync;
submit_bh(READ, bh);
} else {
unlock_buffer(bh);
ret = 1;
}
done:
brelse(bh);
return 0;
return ret;
}
struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)

76
fs/btrfs/extent-tree.c
View File

@ -12,6 +12,33 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
static void reada_extent_leaves(struct btrfs_root *root,
struct btrfs_path *path, u64 limit)
{
struct btrfs_node *node;
int i;
int nritems;
u64 item_objectid;
u64 blocknr;
int slot;
int ret;
if (!path->nodes[1])
return;
node = btrfs_buffer_node(path->nodes[1]);
slot = path->slots[1] + 1;
nritems = btrfs_header_nritems(&node->header);
for (i = slot; i < nritems && i < slot + 8; i++) {
item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
if (item_objectid > limit)
break;
blocknr = btrfs_node_blockptr(node, i);
ret = readahead_tree_block(root, blocknr);
if (ret)
break;
}
}
static int cache_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache *block_group)
{
@ -24,6 +51,7 @@ static int cache_block_group(struct btrfs_root *root,
u64 i;
u64 last = 0;
u64 hole_size;
u64 limit;
int found = 0;
root = root->fs_info->extent_root;
@ -46,14 +74,17 @@ printk("cache block group %Lu\n", block_group->key.objectid);
return ret;
if (ret && path->slots[0] > 0)
path->slots[0]--;
limit = block_group->key.objectid + block_group->key.offset;
reada_extent_leaves(root, path, limit);
while(1) {
leaf = btrfs_buffer_leaf(path->nodes[0]);
slot = path->slots[0];
if (slot >= btrfs_header_nritems(&leaf->header)) {
reada_extent_leaves(root, path, limit);
ret = btrfs_next_leaf(root, path);
if (ret == 0)
if (ret == 0) {
continue;
else {
} else {
if (found) {
hole_size = block_group->key.objectid +
block_group->key.offset - last;
@ -187,7 +218,7 @@ new_group:
return max((*cache_ret)->last_alloc, search_start);
}
cache = btrfs_find_block_group(root, cache,
last + cache->key.offset - 1, 0);
last + cache->key.offset - 1, 0, 0);
*cache_ret = cache;
goto again;
}
@ -195,7 +226,7 @@ new_group:
struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache
*hint, u64 search_start,
int data)
int data, int owner)
{
struct btrfs_block_group_cache *cache[8];
struct btrfs_block_group_cache *found_group = NULL;
@ -207,6 +238,10 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
int i;
int ret;
int full_search = 0;
int factor = 8;
if (!owner)
factor = 5;
if (data)
radix = &info->block_group_data_radix;
@ -219,14 +254,14 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
if (shint->data == data) {
used = btrfs_block_group_used(&shint->item);
if (used + shint->pinned <
(shint->key.offset * 8) / 10) {
(shint->key.offset * factor) / 10) {
return shint;
}
}
}
if (hint && hint->data == data) {
used = btrfs_block_group_used(&hint->item);
if (used + hint->pinned < (hint->key.offset * 8) / 10) {
if (used + hint->pinned < (hint->key.offset * factor) / 10) {
return hint;
}
if (used >= (hint->key.offset * 8) / 10) {
@ -261,7 +296,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
cache[i]->key.offset;
used = btrfs_block_group_used(&cache[i]->item);
if (used + cache[i]->pinned <
(cache[i]->key.offset * 8) / 10) {
(cache[i]->key.offset * factor) / 10) {
found_group = cache[i];
goto found;
}
@ -272,6 +307,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
BTRFS_BLOCK_GROUP_AVAIL);
}
}
cond_resched();
}
last = hint_last;
again:
@ -295,13 +331,16 @@ again:
BTRFS_BLOCK_GROUP_AVAIL);
}
}
cond_resched();
}
if (!full_search) {
printk("find block group doing full search data %d start %Lu\n", data, search_start);
last = search_start;
full_search = 1;
goto again;
}
if (!found_group) {
printk("find block group bailing to zero data %d\n", data);
ret = radix_tree_gang_lookup(radix,
(void **)&found_group, 0, 1);
BUG_ON(ret != 1);
@ -554,8 +593,8 @@ static int update_block_group(struct btrfs_trans_handle *trans,
blocknr + i);
}
}
if (old_val < (cache->key.offset * 6) / 10 &&
old_val + num >= (cache->key.offset * 6) / 10) {
if (old_val < (cache->key.offset * 5) / 10 &&
old_val + num >= (cache->key.offset * 5) / 10) {
printk("group %Lu now available\n", cache->key.objectid);
radix_tree_tag_set(cache->radix,
cache->key.objectid +
@ -842,6 +881,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
int level;
struct btrfs_block_group_cache *block_group;
int full_scan = 0;
u64 limit;
path = btrfs_alloc_path();
ins->flags = 0;
@ -858,11 +898,11 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
if (search_start) {
block_group = lookup_block_group(info, search_start);
block_group = btrfs_find_block_group(root, block_group,
search_start, data);
search_start, data, 1);
} else {
block_group = btrfs_find_block_group(root,
trans->block_group, 0,
data);
data, 1);
}
check_failed:
@ -916,6 +956,12 @@ check_failed:
info->extent_tree_prealloc_nr = 0;
total_found = 0;
}
if (start_found)
limit = last_block +
block_group->key.offset / 2;
else
limit = search_start +
block_group->key.offset / 2;
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;
@ -960,6 +1006,7 @@ check_failed:
}
next:
path->slots[0]++;
cond_resched();
}
// FIXME -ENOSPC
check_pending:
@ -1049,7 +1096,8 @@ printk("doing full scan!\n");
block_group = lookup_block_group(info, search_start);
if (!full_scan)
block_group = btrfs_find_block_group(root, block_group,
search_start, data);
search_start, data, 0);
cond_resched();
goto check_failed;
error:
@ -1102,7 +1150,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
* in the correct block group.
*/
if (data) {
ret = find_free_extent(trans, root, 0, search_start,
ret = find_free_extent(trans, root, 0, 0,
search_end, &prealloc_key, 0);
if (ret) {
return ret;
@ -1173,7 +1221,7 @@ struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct buffer_head *buf;
ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
1, 0, (unsigned long)-1, &ins, 0);
1, hint, (unsigned long)-1, &ins, 0);
if (ret) {
BUG();
return NULL;

76
fs/btrfs/super.c
View File

@ -351,6 +351,35 @@ static int btrfs_free_inode(struct btrfs_trans_handle *trans,
return ret;
}
static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path,
u64 objectid)
{
struct btrfs_node *node;
int i;
int nritems;
u64 item_objectid;
u64 blocknr;
int slot;
int ret;
if (!path->nodes[1])
return;
node = btrfs_buffer_node(path->nodes[1]);
slot = path->slots[1];
if (slot == 0)
return;
nritems = btrfs_header_nritems(&node->header);
for (i = slot - 1; i >= 0; i--) {
item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
if (item_objectid != objectid)
break;
blocknr = btrfs_node_blockptr(node, i);
ret = readahead_tree_block(root, blocknr);
if (ret)
break;
}
}
static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode)
@ -386,6 +415,7 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
BUG_ON(path->slots[0] == 0);
path->slots[0]--;
}
reada_truncate(root, path, inode->i_ino);
leaf = btrfs_buffer_leaf(path->nodes[0]);
found_key = &leaf->items[path->slots[0]].key;
if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
@ -587,28 +617,30 @@ printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_r
return d_splice_alias(inode, dentry);
}
static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path)
static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path,
u64 objectid)
{
struct btrfs_node *node;
int i;
int nritems;
u64 objectid;
u32 nritems;
u64 item_objectid;
u64 blocknr;
int slot;
int ret;
if (!path->nodes[1])
return;
node = btrfs_buffer_node(path->nodes[1]);
slot = path->slots[1];
objectid = btrfs_disk_key_objectid(&node->ptrs[slot].key);
nritems = btrfs_header_nritems(&node->header);
for (i = slot; i < nritems; i++) {
for (i = slot + 1; i < nritems; i++) {
item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
if (item_objectid != objectid)
break;
blocknr = btrfs_node_blockptr(node, i);
readahead_tree_block(root, blocknr);
ret = readahead_tree_block(root, blocknr);
if (ret)
break;
}
}
@ -646,21 +678,20 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
if (ret < 0)
goto err;
advance = 0;
reada_leaves(root, path);
reada_leaves(root, path, inode->i_ino);
while(1) {
leaf = btrfs_buffer_leaf(path->nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
slot = path->slots[0];
if (advance || slot >= nritems) {
if (slot >= nritems -1) {
reada_leaves(root, path, inode->i_ino);
ret = btrfs_next_leaf(root, path);
if (ret)
break;
leaf = btrfs_buffer_leaf(path->nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
slot = path->slots[0];
if (path->slots[1] == 0)
reada_leaves(root, path);
} else {
slot++;
path->slots[0]++;
@ -805,13 +836,18 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
struct btrfs_inode_item inode_item;
struct btrfs_key *location;
int ret;
int owner;
inode = new_inode(root->fs_info->sb);
if (!inode)
return ERR_PTR(-ENOMEM);
BTRFS_I(inode)->root = root;
group = btrfs_find_block_group(root, group, 0, 0);
if (mode & S_IFDIR)
owner = 0;
else
owner = 1;
group = btrfs_find_block_group(root, group, 0, 0, owner);
BTRFS_I(inode)->block_group = group;
inode->i_uid = current->fsuid;
@ -1562,7 +1598,7 @@ failed:
static int drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode,
u64 start, u64 end)
u64 start, u64 end, u64 *hint_block)
{
int ret;
struct btrfs_key key;
@ -1659,17 +1695,14 @@ static int drop_extents(struct btrfs_trans_handle *trans,
new_num = (start - key.offset) >>
inode->i_blkbits;
old_num = btrfs_file_extent_num_blocks(extent);
*hint_block =
btrfs_file_extent_disk_blocknr(extent);
inode->i_blocks -= (old_num - new_num) << 3;
btrfs_set_file_extent_num_blocks(extent,
new_num);
mark_buffer_dirty(path->nodes[0]);
} else {
WARN_ON(1);
/*
ret = btrfs_truncate_item(trans, root, path,
start - key.offset);
BUG_ON(ret);
*/
}
}
if (!keep) {
@ -1683,6 +1716,8 @@ static int drop_extents(struct btrfs_trans_handle *trans,
btrfs_file_extent_disk_num_blocks(extent);
extent_num_blocks =
btrfs_file_extent_num_blocks(extent);
*hint_block =
btrfs_file_extent_disk_blocknr(extent);
}
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
@ -1831,6 +1866,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
u64 start_pos;
u64 num_blocks;
u64 alloc_extent_start;
u64 hint_block;
struct btrfs_trans_handle *trans;
struct btrfs_key ins;
pinned[0] = NULL;
@ -1871,6 +1907,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
}
if (first_index != last_index &&
(last_index << PAGE_CACHE_SHIFT) < inode->i_size &&
pos + count < inode->i_size &&
(count & (PAGE_CACHE_SIZE - 1))) {
pinned[1] = grab_cache_page(inode->i_mapping, last_index);
if (!PageUptodate(pinned[1])) {
@ -1892,18 +1929,20 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
btrfs_set_trans_block_group(trans, inode);
/* FIXME blocksize != 4096 */
inode->i_blocks += num_blocks << 3;
hint_block = 0;
if (start_pos < inode->i_size) {
/* FIXME blocksize != pagesize */
ret = drop_extents(trans, root, inode,
start_pos,
(pos + count + root->blocksize -1) &
~((u64)root->blocksize - 1));
~((u64)root->blocksize - 1), &hint_block);
BUG_ON(ret);
}
if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size ||
pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
ret = btrfs_alloc_extent(trans, root, inode->i_ino,
num_blocks, 1, (u64)-1, &ins, 1);
num_blocks, hint_block, (u64)-1,
&ins, 1);
BUG_ON(ret);
ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
start_pos, ins.objectid, ins.offset);
@ -2455,7 +2494,6 @@ static int btrfs_get_sb(struct file_system_type *fs_type,
btrfs_fill_super, mnt);
}
static int btrfs_getattr(struct vfsmount *mnt,
struct dentry *dentry, struct kstat *stat)
{