1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Red Hat. All rights reserved.
7 #include <linux/string.h>
8 #include <linux/xattr.h>
9 #include <linux/posix_acl_xattr.h>
10 #include <linux/posix_acl.h>
11 #include <linux/sched.h>
12 #include <linux/sched/mm.h>
13 #include <linux/slab.h>
18 struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu)
23 struct posix_acl *acl;
26 return ERR_PTR(-ECHILD);
30 name = XATTR_NAME_POSIX_ACL_ACCESS;
32 case ACL_TYPE_DEFAULT:
33 name = XATTR_NAME_POSIX_ACL_DEFAULT;
36 return ERR_PTR(-EINVAL);
39 size = btrfs_getxattr(inode, name, NULL, 0);
41 value = kzalloc(size, GFP_KERNEL);
43 return ERR_PTR(-ENOMEM);
44 size = btrfs_getxattr(inode, name, value, size);
47 acl = posix_acl_from_xattr(&init_user_ns, value, size);
48 else if (size == -ENODATA || size == 0)
57 int __btrfs_set_acl(struct btrfs_trans_handle *trans, struct inode *inode,
58 struct posix_acl *acl, int type)
66 name = XATTR_NAME_POSIX_ACL_ACCESS;
68 case ACL_TYPE_DEFAULT:
69 if (!S_ISDIR(inode->i_mode))
70 return acl ? -EINVAL : 0;
71 name = XATTR_NAME_POSIX_ACL_DEFAULT;
78 unsigned int nofs_flag;
80 size = posix_acl_xattr_size(acl->a_count);
82 * We're holding a transaction handle, so use a NOFS memory
83 * allocation context to avoid deadlock if reclaim happens.
85 nofs_flag = memalloc_nofs_save();
86 value = kmalloc(size, GFP_KERNEL);
87 memalloc_nofs_restore(nofs_flag);
93 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
99 ret = btrfs_setxattr(trans, inode, name, value, size, 0);
101 ret = btrfs_setxattr_trans(inode, name, value, size, 0);
107 set_cached_acl(inode, type, acl);
112 int btrfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
113 struct posix_acl *acl, int type)
116 struct inode *inode = d_inode(dentry);
117 umode_t old_mode = inode->i_mode;
119 if (type == ACL_TYPE_ACCESS && acl) {
120 ret = posix_acl_update_mode(idmap, inode,
121 &inode->i_mode, &acl);
125 ret = __btrfs_set_acl(NULL, inode, acl, type);
127 inode->i_mode = old_mode;