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>

1 files changed, 1 insertions, 9 deletions

diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index f63488dc2f16..3e9eb91c3c89 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -153,7 +153,6 @@ ssize_t btrfs_xattr_get(struct inode *inode, int name_index,
                 return -ENOMEM;
         }
 
-        mutex_lock(&root->fs_info->fs_mutex);
         /* lookup the xattr by name */
         di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name,
                                 strlen(name), 0);
@@ -181,7 +180,6 @@ ssize_t btrfs_xattr_get(struct inode *inode, int name_index,
         ret = btrfs_dir_data_len(leaf, di);
 
 out:
-        mutex_unlock(&root->fs_info->fs_mutex);
         kfree(name);
         btrfs_free_path(path);
         return ret;
@@ -210,7 +208,6 @@ int btrfs_xattr_set(struct inode *inode, int name_index,
                 return -ENOMEM;
         }
 
-        mutex_lock(&root->fs_info->fs_mutex);
         trans = btrfs_start_transaction(root, 1);
         btrfs_set_trans_block_group(trans, inode);
 
@@ -260,7 +257,6 @@ out:
         }
 
         btrfs_end_transaction(trans, root);
-        mutex_unlock(&root->fs_info->fs_mutex);
         kfree(name);
         btrfs_free_path(path);
 
@@ -297,8 +293,6 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
                 return -ENOMEM;
         path->reada = 2;
 
-        mutex_lock(&root->fs_info->fs_mutex);
-
         /* search for our xattrs */
         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
         if (ret < 0)
@@ -379,15 +373,13 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
         ret = total_size;
 
 err:
-        mutex_unlock(&root->fs_info->fs_mutex);
         btrfs_free_path(path);
 
         return ret;
 }
 
 /*
- * delete all the xattrs associated with the inode.  fs_mutex should be
- * held when we come into here
+ * delete all the xattrs associated with the inode.
  */
 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
                         struct btrfs_root *root, struct inode *inode)