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b4d0d230 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d3e3b7ea DH |
2 | /* Extended attribute handling for AFS. We use xattrs to get and set metadata |
3 | * instead of providing pioctl(). | |
4 | * | |
5 | * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved. | |
6 | * Written by David Howells (dhowells@redhat.com) | |
d3e3b7ea DH |
7 | */ |
8 | ||
9 | #include <linux/slab.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/xattr.h> | |
12 | #include "internal.h" | |
d3e3b7ea | 13 | |
e49c7b2f DH |
14 | /* |
15 | * Deal with the result of a successful fetch ACL operation. | |
16 | */ | |
17 | static void afs_acl_success(struct afs_operation *op) | |
18 | { | |
19 | afs_vnode_commit_status(op, &op->file[0]); | |
20 | } | |
21 | ||
22 | static void afs_acl_put(struct afs_operation *op) | |
23 | { | |
24 | kfree(op->acl); | |
25 | } | |
26 | ||
27 | static const struct afs_operation_ops afs_fetch_acl_operation = { | |
28 | .issue_afs_rpc = afs_fs_fetch_acl, | |
29 | .success = afs_acl_success, | |
30 | .put = afs_acl_put, | |
31 | }; | |
32 | ||
260f082b DH |
33 | /* |
34 | * Get a file's ACL. | |
35 | */ | |
36 | static int afs_xattr_get_acl(const struct xattr_handler *handler, | |
37 | struct dentry *dentry, | |
38 | struct inode *inode, const char *name, | |
39 | void *buffer, size_t size) | |
40 | { | |
e49c7b2f | 41 | struct afs_operation *op; |
260f082b DH |
42 | struct afs_vnode *vnode = AFS_FS_I(inode); |
43 | struct afs_acl *acl = NULL; | |
e49c7b2f | 44 | int ret; |
a58823ac | 45 | |
e49c7b2f DH |
46 | op = afs_alloc_operation(NULL, vnode->volume); |
47 | if (IS_ERR(op)) | |
48 | return -ENOMEM; | |
260f082b | 49 | |
e49c7b2f DH |
50 | afs_op_set_vnode(op, 0, vnode); |
51 | op->ops = &afs_fetch_acl_operation; | |
260f082b | 52 | |
e49c7b2f DH |
53 | afs_begin_vnode_operation(op); |
54 | afs_wait_for_operation(op); | |
55 | acl = op->acl; | |
56 | op->acl = NULL; | |
57 | ret = afs_put_operation(op); | |
260f082b DH |
58 | |
59 | if (ret == 0) { | |
60 | ret = acl->size; | |
61 | if (size > 0) { | |
cc1dd5c8 DH |
62 | if (acl->size <= size) |
63 | memcpy(buffer, acl->data, acl->size); | |
64 | else | |
248c944e | 65 | ret = -ERANGE; |
260f082b | 66 | } |
260f082b DH |
67 | } |
68 | ||
e49c7b2f | 69 | kfree(acl); |
260f082b DH |
70 | return ret; |
71 | } | |
72 | ||
e49c7b2f DH |
73 | static bool afs_make_acl(struct afs_operation *op, |
74 | const void *buffer, size_t size) | |
75 | { | |
76 | struct afs_acl *acl; | |
77 | ||
78 | acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL); | |
79 | if (!acl) { | |
80 | afs_op_nomem(op); | |
81 | return false; | |
82 | } | |
83 | ||
84 | acl->size = size; | |
85 | memcpy(acl->data, buffer, size); | |
86 | op->acl = acl; | |
87 | return true; | |
88 | } | |
89 | ||
90 | static const struct afs_operation_ops afs_store_acl_operation = { | |
91 | .issue_afs_rpc = afs_fs_store_acl, | |
92 | .success = afs_acl_success, | |
93 | .put = afs_acl_put, | |
94 | }; | |
95 | ||
b10494af JG |
96 | /* |
97 | * Set a file's AFS3 ACL. | |
98 | */ | |
99 | static int afs_xattr_set_acl(const struct xattr_handler *handler, | |
39f60c1c | 100 | struct mnt_idmap *idmap, |
b10494af JG |
101 | struct dentry *dentry, |
102 | struct inode *inode, const char *name, | |
103 | const void *buffer, size_t size, int flags) | |
104 | { | |
e49c7b2f | 105 | struct afs_operation *op; |
b10494af | 106 | struct afs_vnode *vnode = AFS_FS_I(inode); |
b10494af JG |
107 | |
108 | if (flags == XATTR_CREATE) | |
109 | return -EINVAL; | |
110 | ||
e49c7b2f DH |
111 | op = afs_alloc_operation(NULL, vnode->volume); |
112 | if (IS_ERR(op)) | |
113 | return -ENOMEM; | |
a58823ac | 114 | |
e49c7b2f DH |
115 | afs_op_set_vnode(op, 0, vnode); |
116 | if (!afs_make_acl(op, buffer, size)) | |
117 | return afs_put_operation(op); | |
b10494af | 118 | |
e49c7b2f DH |
119 | op->ops = &afs_store_acl_operation; |
120 | return afs_do_sync_operation(op); | |
b10494af JG |
121 | } |
122 | ||
260f082b | 123 | static const struct xattr_handler afs_xattr_afs_acl_handler = { |
b10494af JG |
124 | .name = "afs.acl", |
125 | .get = afs_xattr_get_acl, | |
126 | .set = afs_xattr_set_acl, | |
260f082b DH |
127 | }; |
128 | ||
e49c7b2f DH |
129 | static const struct afs_operation_ops yfs_fetch_opaque_acl_operation = { |
130 | .issue_yfs_rpc = yfs_fs_fetch_opaque_acl, | |
131 | .success = afs_acl_success, | |
132 | /* Don't free op->yacl in .put here */ | |
133 | }; | |
134 | ||
ae46578b DH |
135 | /* |
136 | * Get a file's YFS ACL. | |
137 | */ | |
138 | static int afs_xattr_get_yfs(const struct xattr_handler *handler, | |
139 | struct dentry *dentry, | |
140 | struct inode *inode, const char *name, | |
141 | void *buffer, size_t size) | |
142 | { | |
e49c7b2f | 143 | struct afs_operation *op; |
ae46578b DH |
144 | struct afs_vnode *vnode = AFS_FS_I(inode); |
145 | struct yfs_acl *yacl = NULL; | |
ae46578b | 146 | char buf[16], *data; |
773e0c40 | 147 | int which = 0, dsize, ret = -ENOMEM; |
ae46578b DH |
148 | |
149 | if (strcmp(name, "acl") == 0) | |
150 | which = 0; | |
151 | else if (strcmp(name, "acl_inherited") == 0) | |
152 | which = 1; | |
153 | else if (strcmp(name, "acl_num_cleaned") == 0) | |
154 | which = 2; | |
155 | else if (strcmp(name, "vol_acl") == 0) | |
156 | which = 3; | |
157 | else | |
158 | return -EOPNOTSUPP; | |
159 | ||
773e0c40 DH |
160 | yacl = kzalloc(sizeof(struct yfs_acl), GFP_KERNEL); |
161 | if (!yacl) | |
162 | goto error; | |
163 | ||
ae46578b | 164 | if (which == 0) |
773e0c40 | 165 | yacl->flags |= YFS_ACL_WANT_ACL; |
ae46578b | 166 | else if (which == 3) |
773e0c40 | 167 | yacl->flags |= YFS_ACL_WANT_VOL_ACL; |
ae46578b | 168 | |
e49c7b2f DH |
169 | op = afs_alloc_operation(NULL, vnode->volume); |
170 | if (IS_ERR(op)) | |
a58823ac DH |
171 | goto error_yacl; |
172 | ||
e49c7b2f DH |
173 | afs_op_set_vnode(op, 0, vnode); |
174 | op->yacl = yacl; | |
175 | op->ops = &yfs_fetch_opaque_acl_operation; | |
ae46578b | 176 | |
e49c7b2f DH |
177 | afs_begin_vnode_operation(op); |
178 | afs_wait_for_operation(op); | |
179 | ret = afs_put_operation(op); | |
a58823ac | 180 | |
e49c7b2f DH |
181 | if (ret == 0) { |
182 | switch (which) { | |
183 | case 0: | |
184 | data = yacl->acl->data; | |
185 | dsize = yacl->acl->size; | |
186 | break; | |
187 | case 1: | |
188 | data = buf; | |
189 | dsize = scnprintf(buf, sizeof(buf), "%u", yacl->inherit_flag); | |
190 | break; | |
191 | case 2: | |
192 | data = buf; | |
193 | dsize = scnprintf(buf, sizeof(buf), "%u", yacl->num_cleaned); | |
194 | break; | |
195 | case 3: | |
196 | data = yacl->vol_acl->data; | |
197 | dsize = yacl->vol_acl->size; | |
198 | break; | |
199 | default: | |
200 | ret = -EOPNOTSUPP; | |
201 | goto error_yacl; | |
ae46578b DH |
202 | } |
203 | ||
e49c7b2f DH |
204 | ret = dsize; |
205 | if (size > 0) { | |
206 | if (dsize <= size) | |
207 | memcpy(buffer, data, dsize); | |
208 | else | |
209 | ret = -ERANGE; | |
ae46578b | 210 | } |
64fcbb61 DH |
211 | } else if (ret == -ENOTSUPP) { |
212 | ret = -ENODATA; | |
ae46578b DH |
213 | } |
214 | ||
773e0c40 DH |
215 | error_yacl: |
216 | yfs_free_opaque_acl(yacl); | |
217 | error: | |
ae46578b DH |
218 | return ret; |
219 | } | |
220 | ||
e49c7b2f DH |
221 | static const struct afs_operation_ops yfs_store_opaque_acl2_operation = { |
222 | .issue_yfs_rpc = yfs_fs_store_opaque_acl2, | |
223 | .success = afs_acl_success, | |
f4c79144 | 224 | .put = afs_acl_put, |
e49c7b2f DH |
225 | }; |
226 | ||
f5e45463 DH |
227 | /* |
228 | * Set a file's YFS ACL. | |
229 | */ | |
230 | static int afs_xattr_set_yfs(const struct xattr_handler *handler, | |
39f60c1c | 231 | struct mnt_idmap *idmap, |
f5e45463 DH |
232 | struct dentry *dentry, |
233 | struct inode *inode, const char *name, | |
234 | const void *buffer, size_t size, int flags) | |
235 | { | |
e49c7b2f | 236 | struct afs_operation *op; |
f5e45463 | 237 | struct afs_vnode *vnode = AFS_FS_I(inode); |
64fcbb61 | 238 | int ret; |
f5e45463 DH |
239 | |
240 | if (flags == XATTR_CREATE || | |
241 | strcmp(name, "acl") != 0) | |
242 | return -EINVAL; | |
243 | ||
e49c7b2f DH |
244 | op = afs_alloc_operation(NULL, vnode->volume); |
245 | if (IS_ERR(op)) | |
246 | return -ENOMEM; | |
f5e45463 | 247 | |
e49c7b2f DH |
248 | afs_op_set_vnode(op, 0, vnode); |
249 | if (!afs_make_acl(op, buffer, size)) | |
250 | return afs_put_operation(op); | |
f5e45463 | 251 | |
e49c7b2f | 252 | op->ops = &yfs_store_opaque_acl2_operation; |
64fcbb61 DH |
253 | ret = afs_do_sync_operation(op); |
254 | if (ret == -ENOTSUPP) | |
255 | ret = -ENODATA; | |
256 | return ret; | |
f5e45463 DH |
257 | } |
258 | ||
ae46578b DH |
259 | static const struct xattr_handler afs_xattr_yfs_handler = { |
260 | .prefix = "afs.yfs.", | |
261 | .get = afs_xattr_get_yfs, | |
f5e45463 | 262 | .set = afs_xattr_set_yfs, |
ae46578b DH |
263 | }; |
264 | ||
d3e3b7ea DH |
265 | /* |
266 | * Get the name of the cell on which a file resides. | |
267 | */ | |
268 | static int afs_xattr_get_cell(const struct xattr_handler *handler, | |
269 | struct dentry *dentry, | |
270 | struct inode *inode, const char *name, | |
271 | void *buffer, size_t size) | |
272 | { | |
273 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
274 | struct afs_cell *cell = vnode->volume->cell; | |
275 | size_t namelen; | |
276 | ||
989782dc | 277 | namelen = cell->name_len; |
d3e3b7ea DH |
278 | if (size == 0) |
279 | return namelen; | |
280 | if (namelen > size) | |
281 | return -ERANGE; | |
c73aa410 | 282 | memcpy(buffer, cell->name, namelen); |
d3e3b7ea DH |
283 | return namelen; |
284 | } | |
285 | ||
286 | static const struct xattr_handler afs_xattr_afs_cell_handler = { | |
287 | .name = "afs.cell", | |
288 | .get = afs_xattr_get_cell, | |
289 | }; | |
290 | ||
291 | /* | |
292 | * Get the volume ID, vnode ID and vnode uniquifier of a file as a sequence of | |
293 | * hex numbers separated by colons. | |
294 | */ | |
295 | static int afs_xattr_get_fid(const struct xattr_handler *handler, | |
296 | struct dentry *dentry, | |
297 | struct inode *inode, const char *name, | |
298 | void *buffer, size_t size) | |
299 | { | |
300 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
a2f611a3 | 301 | char text[16 + 1 + 24 + 1 + 8 + 1]; |
d3e3b7ea DH |
302 | size_t len; |
303 | ||
a2f611a3 DH |
304 | /* The volume ID is 64-bit, the vnode ID is 96-bit and the |
305 | * uniquifier is 32-bit. | |
306 | */ | |
2e2fae99 | 307 | len = scnprintf(text, sizeof(text), "%llx:", vnode->fid.vid); |
a2f611a3 | 308 | if (vnode->fid.vnode_hi) |
2e2fae99 MS |
309 | len += scnprintf(text + len, sizeof(text) - len, "%x%016llx", |
310 | vnode->fid.vnode_hi, vnode->fid.vnode); | |
a2f611a3 | 311 | else |
2e2fae99 MS |
312 | len += scnprintf(text + len, sizeof(text) - len, "%llx", |
313 | vnode->fid.vnode); | |
314 | len += scnprintf(text + len, sizeof(text) - len, ":%x", | |
315 | vnode->fid.unique); | |
a2f611a3 | 316 | |
d3e3b7ea DH |
317 | if (size == 0) |
318 | return len; | |
319 | if (len > size) | |
320 | return -ERANGE; | |
321 | memcpy(buffer, text, len); | |
322 | return len; | |
323 | } | |
324 | ||
325 | static const struct xattr_handler afs_xattr_afs_fid_handler = { | |
326 | .name = "afs.fid", | |
327 | .get = afs_xattr_get_fid, | |
328 | }; | |
329 | ||
330 | /* | |
331 | * Get the name of the volume on which a file resides. | |
332 | */ | |
333 | static int afs_xattr_get_volume(const struct xattr_handler *handler, | |
334 | struct dentry *dentry, | |
335 | struct inode *inode, const char *name, | |
336 | void *buffer, size_t size) | |
337 | { | |
338 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
d2ddc776 | 339 | const char *volname = vnode->volume->name; |
d3e3b7ea DH |
340 | size_t namelen; |
341 | ||
342 | namelen = strlen(volname); | |
343 | if (size == 0) | |
344 | return namelen; | |
345 | if (namelen > size) | |
346 | return -ERANGE; | |
c73aa410 | 347 | memcpy(buffer, volname, namelen); |
d3e3b7ea DH |
348 | return namelen; |
349 | } | |
350 | ||
351 | static const struct xattr_handler afs_xattr_afs_volume_handler = { | |
352 | .name = "afs.volume", | |
353 | .get = afs_xattr_get_volume, | |
354 | }; | |
355 | ||
356 | const struct xattr_handler *afs_xattr_handlers[] = { | |
260f082b | 357 | &afs_xattr_afs_acl_handler, |
d3e3b7ea DH |
358 | &afs_xattr_afs_cell_handler, |
359 | &afs_xattr_afs_fid_handler, | |
360 | &afs_xattr_afs_volume_handler, | |
ae46578b | 361 | &afs_xattr_yfs_handler, /* afs.yfs. prefix */ |
d3e3b7ea DH |
362 | NULL |
363 | }; |