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gerrit-public.fairphone.software / kernel / msm-4.9 / fa264ff9e4c8bced2ac0f1577c7b97cfc071c4cc / . / fs / hfsplus / posix_acl.c
blob: 6bb5d7c42888fe049dba0cc98fc2d92f10e5d6d8 [file] [log] [blame]
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]1/*
2 * linux/fs/hfsplus/posix_acl.c
3 *
4 * Vyacheslav Dubeyko <slava@dubeyko.com>
5 *
6 * Handler for Posix Access Control Lists (ACLs) support.
7 */
8
9#include "hfsplus_fs.h"
10#include "xattr.h"
11#include "acl.h"
12
13struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
14{
15 struct posix_acl *acl;
16 char *xattr_name;
17 char *value = NULL;
18 ssize_t size;
19
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]20 hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]21
22 switch (type) {
23 case ACL_TYPE_ACCESS:
Andreas Gruenbacher97d79292015-12-02 14:44:35 +0100[diff] [blame]24 xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]25 break;
26 case ACL_TYPE_DEFAULT:
Andreas Gruenbacher97d79292015-12-02 14:44:35 +0100[diff] [blame]27 xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]28 break;
29 default:
30 return ERR_PTR(-EINVAL);
31 }
32
33 size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
34
35 if (size > 0) {
36 value = (char *)hfsplus_alloc_attr_entry();
37 if (unlikely(!value))
38 return ERR_PTR(-ENOMEM);
39 size = __hfsplus_getxattr(inode, xattr_name, value, size);
40 }
41
42 if (size > 0)
43 acl = posix_acl_from_xattr(&init_user_ns, value, size);
44 else if (size == -ENODATA)
45 acl = NULL;
46 else
47 acl = ERR_PTR(size);
48
49 hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
50
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]51 return acl;
52}
53
Jan Kara5cf84432017-06-21 15:02:47 +0200[diff] [blame]54static int __hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
55 int type)
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]56{
57 int err;
58 char *xattr_name;
59 size_t size = 0;
60 char *value = NULL;
61
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]62 hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]63
64 switch (type) {
65 case ACL_TYPE_ACCESS:
Andreas Gruenbacher97d79292015-12-02 14:44:35 +0100[diff] [blame]66 xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]67 break;
68
69 case ACL_TYPE_DEFAULT:
Andreas Gruenbacher97d79292015-12-02 14:44:35 +0100[diff] [blame]70 xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]71 if (!S_ISDIR(inode->i_mode))
72 return acl ? -EACCES : 0;
73 break;
74
75 default:
76 return -EINVAL;
77 }
78
79 if (acl) {
80 size = posix_acl_xattr_size(acl->a_count);
81 if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
82 return -ENOMEM;
83 value = (char *)hfsplus_alloc_attr_entry();
84 if (unlikely(!value))
85 return -ENOMEM;
86 err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
87 if (unlikely(err < 0))
88 goto end_set_acl;
89 }
90
91 err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
92
93end_set_acl:
94 hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
95
96 if (!err)
97 set_cached_acl(inode, type, acl);
98
99 return err;
100}
101
Jan Kara5cf84432017-06-21 15:02:47 +0200[diff] [blame]102int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type)
103{
104 int err;
105
106 if (type == ACL_TYPE_ACCESS && acl) {
107 err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
108 if (err)
109 return err;
110 }
111 return __hfsplus_set_posix_acl(inode, acl, type);
112}
113
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]114int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
115{
116 int err = 0;
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]117 struct posix_acl *default_acl, *acl;
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]118
119 hfs_dbg(ACL_MOD,
120 "[%s]: ino %lu, dir->ino %lu\n",
121 __func__, inode->i_ino, dir->i_ino);
122
123 if (S_ISLNK(inode->i_mode))
124 return 0;
125
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]126 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
127 if (err)
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]128 return err;
129
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]130 if (default_acl) {
Jan Kara5cf84432017-06-21 15:02:47 +0200[diff] [blame]131 err = __hfsplus_set_posix_acl(inode, default_acl,
132 ACL_TYPE_DEFAULT);
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]133 posix_acl_release(default_acl);
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]134 }
135
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]136 if (acl) {
137 if (!err)
Jan Kara5cf84432017-06-21 15:02:47 +0200[diff] [blame]138 err = __hfsplus_set_posix_acl(inode, acl,
139 ACL_TYPE_ACCESS);
Christoph Hellwigb0a7ab52013-12-20 05:16:46 -0800[diff] [blame]140 posix_acl_release(acl);
141 }
Vyacheslav Dubeykoeef80d42013-09-11 14:24:29 -0700[diff] [blame]142 return err;
143}