Btrfs: Replace the big fs_mutex with a collection of other locks
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>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 73c6d08..18bbe10 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -252,7 +252,6 @@
end_of_last_block = start_pos + num_bytes - 1;
lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
- mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
if (!trans) {
err = -ENOMEM;
@@ -341,7 +340,6 @@
failed:
err = btrfs_end_transaction(trans, root);
out_unlock:
- mutex_unlock(&root->fs_info->fs_mutex);
unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
return err;
}
@@ -905,9 +903,7 @@
WARN_ON(num_pages > nrptrs);
memset(pages, 0, sizeof(pages));
- mutex_lock(&root->fs_info->fs_mutex);
ret = btrfs_check_free_space(root, write_bytes, 0);
- mutex_unlock(&root->fs_info->fs_mutex);
if (ret)
goto out;
@@ -998,9 +994,9 @@
* check the transaction that last modified this inode
* and see if its already been committed
*/
- mutex_lock(&root->fs_info->fs_mutex);
if (!BTRFS_I(inode)->last_trans)
goto out;
+
mutex_lock(&root->fs_info->trans_mutex);
if (BTRFS_I(inode)->last_trans <=
root->fs_info->last_trans_committed) {
@@ -1023,7 +1019,6 @@
}
ret = btrfs_commit_transaction(trans, root);
out:
- mutex_unlock(&root->fs_info->fs_mutex);
return ret > 0 ? EIO : ret;
}