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Btrfs: Replace the big fs_mutex with a collection of other locks

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Extent alloctions are still protected by a large alloc_mutex.
Objectid allocations are covered by a objectid mutex
Other btree operations are protected by a lock on individual btree nodes

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-06-25 16:01:30 -04:00
parent 925baeddc5
commit a213501153
12 changed files with 101 additions and 165 deletions
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18
fs/btrfs/extent-tree.c
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@ -1577,9 +1577,11 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
}
/* block accounting for super block */
spin_lock_irq(&info->delalloc_lock);
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_super_bytes_used(&info->super_copy,
super_used - num_bytes);
spin_unlock_irq(&info->delalloc_lock);
/* block accounting for root item */
root_used = btrfs_root_used(&root->root_item);
@ -1968,8 +1970,10 @@ again:
}
/* block accounting for super block */
spin_lock_irq(&info->delalloc_lock);
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
spin_unlock_irq(&info->delalloc_lock);
/* block accounting for root item */
root_used = btrfs_root_used(&root->root_item);
@ -2172,12 +2176,12 @@ static void noinline reada_walk_down(struct btrfs_root *root,
continue;
}
}
mutex_unlock(&root->fs_info->fs_mutex);
mutex_unlock(&root->fs_info->alloc_mutex);
ret = readahead_tree_block(root, bytenr, blocksize,
btrfs_node_ptr_generation(node, i));
last = bytenr + blocksize;
cond_resched();
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->alloc_mutex);
if (ret)
break;
}
@ -2254,11 +2258,9 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
free_extent_buffer(next);
reada_walk_down(root, cur, path->slots[*level]);
mutex_unlock(&root->fs_info->fs_mutex);
mutex_unlock(&root->fs_info->alloc_mutex);
next = read_tree_block(root, bytenr, blocksize,
ptr_gen);
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->alloc_mutex);
/* we've dropped the lock, double check */
@ -2381,6 +2383,7 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
int orig_level;
struct btrfs_root_item *root_item = &root->root_item;
WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex));
path = btrfs_alloc_path();
BUG_ON(!path);
@ -2710,7 +2713,6 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
*last_file_root == ref_root)
goto out;
mutex_unlock(&extent_root->fs_info->fs_mutex);
inode = btrfs_iget_locked(extent_root->fs_info->sb,
ref_objectid, found_root);
if (inode->i_state & I_NEW) {
@ -2727,7 +2729,6 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
* the latest version of the tree root
*/
if (is_bad_inode(inode)) {
mutex_lock(&extent_root->fs_info->fs_mutex);
goto out;
}
*last_file_objectid = inode->i_ino;
@ -2736,7 +2737,6 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
relocate_inode_pages(inode, ref_offset, extent_key->offset);
iput(inode);
mutex_lock(&extent_root->fs_info->fs_mutex);
} else {
struct btrfs_trans_handle *trans;
struct extent_buffer *eb;
@ -3033,9 +3033,7 @@ next:
if (progress && need_resched()) {
memcpy(&key, &found_key, sizeof(key));
mutex_unlock(&root->fs_info->fs_mutex);
cond_resched();
mutex_lock(&root->fs_info->fs_mutex);
btrfs_release_path(root, path);
btrfs_search_slot(NULL, root, &key, path, 0, 0);
progress = 0;
@ -3068,9 +3066,7 @@ next:
trans = btrfs_start_transaction(tree_root, 1);
btrfs_commit_transaction(trans, tree_root);
mutex_unlock(&root->fs_info->fs_mutex);
btrfs_clean_old_snapshots(tree_root);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(tree_root, 1);
btrfs_commit_transaction(trans, tree_root);