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Commit | Line | Data |
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5db11c21 MM |
1 | /* |
2 | * (C) 2001 Clemson University and The University of Chicago | |
3 | * | |
4 | * See COPYING in top-level directory. | |
5 | */ | |
6 | ||
7 | #include "protocol.h" | |
575e9461 MM |
8 | #include "orangefs-kernel.h" |
9 | #include "orangefs-bufmap.h" | |
5db11c21 MM |
10 | #include <linux/posix_acl_xattr.h> |
11 | #include <linux/fs_struct.h> | |
12 | ||
8bb8aefd | 13 | struct posix_acl *orangefs_get_acl(struct inode *inode, int type) |
5db11c21 MM |
14 | { |
15 | struct posix_acl *acl; | |
16 | int ret; | |
17 | char *key = NULL, *value = NULL; | |
18 | ||
19 | switch (type) { | |
20 | case ACL_TYPE_ACCESS: | |
972a7344 | 21 | key = XATTR_NAME_POSIX_ACL_ACCESS; |
5db11c21 MM |
22 | break; |
23 | case ACL_TYPE_DEFAULT: | |
972a7344 | 24 | key = XATTR_NAME_POSIX_ACL_DEFAULT; |
5db11c21 MM |
25 | break; |
26 | default: | |
8bb8aefd | 27 | gossip_err("orangefs_get_acl: bogus value of type %d\n", type); |
5db11c21 MM |
28 | return ERR_PTR(-EINVAL); |
29 | } | |
30 | /* | |
31 | * Rather than incurring a network call just to determine the exact | |
32 | * length of the attribute, I just allocate a max length to save on | |
33 | * the network call. Conceivably, we could pass NULL to | |
8bb8aefd | 34 | * orangefs_inode_getxattr() to probe the length of the value, but |
5db11c21 MM |
35 | * I don't do that for now. |
36 | */ | |
8bb8aefd | 37 | value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL); |
5db11c21 MM |
38 | if (value == NULL) |
39 | return ERR_PTR(-ENOMEM); | |
40 | ||
41 | gossip_debug(GOSSIP_ACL_DEBUG, | |
42 | "inode %pU, key %s, type %d\n", | |
43 | get_khandle_from_ino(inode), | |
44 | key, | |
45 | type); | |
d373a712 AG |
46 | ret = orangefs_inode_getxattr(inode, key, value, |
47 | ORANGEFS_MAX_XATTR_VALUELEN); | |
5db11c21 MM |
48 | /* if the key exists, convert it to an in-memory rep */ |
49 | if (ret > 0) { | |
50 | acl = posix_acl_from_xattr(&init_user_ns, value, ret); | |
51 | } else if (ret == -ENODATA || ret == -ENOSYS) { | |
52 | acl = NULL; | |
53 | } else { | |
54 | gossip_err("inode %pU retrieving acl's failed with error %d\n", | |
55 | get_khandle_from_ino(inode), | |
56 | ret); | |
57 | acl = ERR_PTR(ret); | |
58 | } | |
59 | /* kfree(NULL) is safe, so don't worry if value ever got used */ | |
60 | kfree(value); | |
61 | return acl; | |
62 | } | |
63 | ||
8bb8aefd | 64 | int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
5db11c21 | 65 | { |
8bb8aefd | 66 | struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); |
5db11c21 MM |
67 | int error = 0; |
68 | void *value = NULL; | |
69 | size_t size = 0; | |
70 | const char *name = NULL; | |
71 | ||
72 | switch (type) { | |
73 | case ACL_TYPE_ACCESS: | |
972a7344 | 74 | name = XATTR_NAME_POSIX_ACL_ACCESS; |
5db11c21 MM |
75 | if (acl) { |
76 | umode_t mode = inode->i_mode; | |
77 | /* | |
78 | * can we represent this with the traditional file | |
79 | * mode permission bits? | |
80 | */ | |
81 | error = posix_acl_equiv_mode(acl, &mode); | |
82 | if (error < 0) { | |
83 | gossip_err("%s: posix_acl_equiv_mode err: %d\n", | |
84 | __func__, | |
85 | error); | |
86 | return error; | |
87 | } | |
88 | ||
89 | if (inode->i_mode != mode) | |
8bb8aefd | 90 | SetModeFlag(orangefs_inode); |
5db11c21 MM |
91 | inode->i_mode = mode; |
92 | mark_inode_dirty_sync(inode); | |
93 | if (error == 0) | |
94 | acl = NULL; | |
95 | } | |
96 | break; | |
97 | case ACL_TYPE_DEFAULT: | |
972a7344 | 98 | name = XATTR_NAME_POSIX_ACL_DEFAULT; |
5db11c21 MM |
99 | break; |
100 | default: | |
101 | gossip_err("%s: invalid type %d!\n", __func__, type); | |
102 | return -EINVAL; | |
103 | } | |
104 | ||
105 | gossip_debug(GOSSIP_ACL_DEBUG, | |
106 | "%s: inode %pU, key %s type %d\n", | |
107 | __func__, get_khandle_from_ino(inode), | |
108 | name, | |
109 | type); | |
110 | ||
111 | if (acl) { | |
112 | size = posix_acl_xattr_size(acl->a_count); | |
113 | value = kmalloc(size, GFP_KERNEL); | |
114 | if (!value) | |
115 | return -ENOMEM; | |
116 | ||
117 | error = posix_acl_to_xattr(&init_user_ns, acl, value, size); | |
118 | if (error < 0) | |
119 | goto out; | |
120 | } | |
121 | ||
122 | gossip_debug(GOSSIP_ACL_DEBUG, | |
123 | "%s: name %s, value %p, size %zd, acl %p\n", | |
124 | __func__, name, value, size, acl); | |
125 | /* | |
126 | * Go ahead and set the extended attribute now. NOTE: Suppose acl | |
127 | * was NULL, then value will be NULL and size will be 0 and that | |
128 | * will xlate to a removexattr. However, we don't want removexattr | |
129 | * complain if attributes does not exist. | |
130 | */ | |
d373a712 | 131 | error = orangefs_inode_setxattr(inode, name, value, size, 0); |
5db11c21 MM |
132 | |
133 | out: | |
134 | kfree(value); | |
135 | if (!error) | |
136 | set_cached_acl(inode, type, acl); | |
137 | return error; | |
138 | } | |
139 | ||
8bb8aefd | 140 | int orangefs_init_acl(struct inode *inode, struct inode *dir) |
5db11c21 | 141 | { |
8bb8aefd | 142 | struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); |
5db11c21 MM |
143 | struct posix_acl *default_acl, *acl; |
144 | umode_t mode = inode->i_mode; | |
145 | int error = 0; | |
146 | ||
8bb8aefd | 147 | ClearModeFlag(orangefs_inode); |
5db11c21 MM |
148 | |
149 | error = posix_acl_create(dir, &mode, &default_acl, &acl); | |
150 | if (error) | |
151 | return error; | |
152 | ||
153 | if (default_acl) { | |
8bb8aefd | 154 | error = orangefs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); |
5db11c21 MM |
155 | posix_acl_release(default_acl); |
156 | } | |
157 | ||
158 | if (acl) { | |
159 | if (!error) | |
8bb8aefd | 160 | error = orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS); |
5db11c21 MM |
161 | posix_acl_release(acl); |
162 | } | |
163 | ||
164 | /* If mode of the inode was changed, then do a forcible ->setattr */ | |
165 | if (mode != inode->i_mode) { | |
8bb8aefd | 166 | SetModeFlag(orangefs_inode); |
5db11c21 | 167 | inode->i_mode = mode; |
8bb8aefd | 168 | orangefs_flush_inode(inode); |
5db11c21 MM |
169 | } |
170 | ||
171 | return error; | |
172 | } |