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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5103e947 JB |
2 | /* |
3 | * Copyright (C) 2007 Red Hat. All rights reserved. | |
5103e947 JB |
4 | */ |
5 | ||
6 | #include <linux/fs.h> | |
7 | #include <linux/string.h> | |
8 | #include <linux/xattr.h> | |
9 | #include <linux/posix_acl_xattr.h> | |
33268eaf | 10 | #include <linux/posix_acl.h> |
c1e32da6 | 11 | #include <linux/sched.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
33268eaf | 13 | |
5103e947 | 14 | #include "ctree.h" |
33268eaf | 15 | #include "btrfs_inode.h" |
5103e947 | 16 | #include "xattr.h" |
33268eaf | 17 | |
4e34e719 | 18 | struct posix_acl *btrfs_get_acl(struct inode *inode, int type) |
33268eaf | 19 | { |
95819c05 CH |
20 | int size; |
21 | const char *name; | |
33268eaf | 22 | char *value = NULL; |
073aaa1b AV |
23 | struct posix_acl *acl; |
24 | ||
33268eaf JB |
25 | switch (type) { |
26 | case ACL_TYPE_ACCESS: | |
97d79299 | 27 | name = XATTR_NAME_POSIX_ACL_ACCESS; |
33268eaf JB |
28 | break; |
29 | case ACL_TYPE_DEFAULT: | |
97d79299 | 30 | name = XATTR_NAME_POSIX_ACL_DEFAULT; |
33268eaf JB |
31 | break; |
32 | default: | |
073aaa1b | 33 | BUG(); |
33268eaf JB |
34 | } |
35 | ||
7852781d | 36 | size = btrfs_getxattr(inode, name, "", 0); |
33268eaf | 37 | if (size > 0) { |
39a27ec1 | 38 | value = kzalloc(size, GFP_KERNEL); |
33268eaf JB |
39 | if (!value) |
40 | return ERR_PTR(-ENOMEM); | |
7852781d | 41 | size = btrfs_getxattr(inode, name, value, size); |
cfbffc39 TI |
42 | } |
43 | if (size > 0) { | |
5f3a4a28 | 44 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
a60617d0 | 45 | } else if (size == -ERANGE || size == -ENODATA || size == 0) { |
33268eaf | 46 | acl = NULL; |
7b1a14bb CM |
47 | } else { |
48 | acl = ERR_PTR(-EIO); | |
33268eaf | 49 | } |
cfbffc39 TI |
50 | kfree(value); |
51 | ||
33268eaf JB |
52 | return acl; |
53 | } | |
54 | ||
996a710d | 55 | static int __btrfs_set_acl(struct btrfs_trans_handle *trans, |
f34f57a3 | 56 | struct inode *inode, struct posix_acl *acl, int type) |
33268eaf | 57 | { |
95819c05 CH |
58 | int ret, size = 0; |
59 | const char *name; | |
33268eaf | 60 | char *value = NULL; |
33268eaf | 61 | |
33268eaf JB |
62 | switch (type) { |
63 | case ACL_TYPE_ACCESS: | |
97d79299 | 64 | name = XATTR_NAME_POSIX_ACL_ACCESS; |
33268eaf JB |
65 | break; |
66 | case ACL_TYPE_DEFAULT: | |
67 | if (!S_ISDIR(inode->i_mode)) | |
68 | return acl ? -EINVAL : 0; | |
97d79299 | 69 | name = XATTR_NAME_POSIX_ACL_DEFAULT; |
33268eaf JB |
70 | break; |
71 | default: | |
72 | return -EINVAL; | |
73 | } | |
74 | ||
75 | if (acl) { | |
76 | size = posix_acl_xattr_size(acl->a_count); | |
39a27ec1 | 77 | value = kmalloc(size, GFP_KERNEL); |
33268eaf JB |
78 | if (!value) { |
79 | ret = -ENOMEM; | |
80 | goto out; | |
81 | } | |
82 | ||
5f3a4a28 | 83 | ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); |
33268eaf JB |
84 | if (ret < 0) |
85 | goto out; | |
86 | } | |
87 | ||
7852781d | 88 | ret = btrfs_setxattr(trans, inode, name, value, size, 0); |
33268eaf | 89 | out: |
d397712b | 90 | kfree(value); |
33268eaf JB |
91 | |
92 | if (!ret) | |
073aaa1b | 93 | set_cached_acl(inode, type, acl); |
33268eaf JB |
94 | |
95 | return ret; | |
96 | } | |
fb4bc1e0 | 97 | |
996a710d | 98 | int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
744f52f9 | 99 | { |
b7f8a09f | 100 | int ret; |
d7d82496 | 101 | umode_t old_mode = inode->i_mode; |
b7f8a09f JK |
102 | |
103 | if (type == ACL_TYPE_ACCESS && acl) { | |
104 | ret = posix_acl_update_mode(inode, &inode->i_mode, &acl); | |
105 | if (ret) | |
106 | return ret; | |
107 | } | |
d7d82496 EF |
108 | ret = __btrfs_set_acl(NULL, inode, acl, type); |
109 | if (ret) | |
110 | inode->i_mode = old_mode; | |
111 | return ret; | |
744f52f9 | 112 | } |
33268eaf | 113 | |
f34f57a3 YZ |
114 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
115 | struct inode *inode, struct inode *dir) | |
33268eaf | 116 | { |
996a710d | 117 | struct posix_acl *default_acl, *acl; |
33268eaf JB |
118 | int ret = 0; |
119 | ||
120 | /* this happens with subvols */ | |
121 | if (!dir) | |
122 | return 0; | |
123 | ||
996a710d CH |
124 | ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
125 | if (ret) | |
126 | return ret; | |
33268eaf | 127 | |
996a710d CH |
128 | if (default_acl) { |
129 | ret = __btrfs_set_acl(trans, inode, default_acl, | |
130 | ACL_TYPE_DEFAULT); | |
131 | posix_acl_release(default_acl); | |
33268eaf JB |
132 | } |
133 | ||
996a710d CH |
134 | if (acl) { |
135 | if (!ret) | |
136 | ret = __btrfs_set_acl(trans, inode, acl, | |
137 | ACL_TYPE_ACCESS); | |
138 | posix_acl_release(acl); | |
33268eaf | 139 | } |
33268eaf | 140 | |
996a710d CH |
141 | if (!default_acl && !acl) |
142 | cache_no_acl(inode); | |
33268eaf | 143 | return ret; |
5103e947 | 144 | } |