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9#include <linux/slab.h>
10#include <linux/fs.h>
11#include <linux/xattr.h>
12#include "internal.h"
13
14static const char afs_xattr_list[] =
15 "afs.acl\0"
16 "afs.cell\0"
17 "afs.fid\0"
18 "afs.volume\0"
19 "afs.yfs.acl\0"
20 "afs.yfs.acl_inherited\0"
21 "afs.yfs.acl_num_cleaned\0"
22 "afs.yfs.vol_acl";
23
24
25
26
27ssize_t afs_listxattr(struct dentry *dentry, char *buffer, size_t size)
28{
29 if (size == 0)
30 return sizeof(afs_xattr_list);
31 if (size < sizeof(afs_xattr_list))
32 return -ERANGE;
33 memcpy(buffer, afs_xattr_list, sizeof(afs_xattr_list));
34 return sizeof(afs_xattr_list);
35}
36
37
38
39
40static int afs_xattr_get_acl(const struct xattr_handler *handler,
41 struct dentry *dentry,
42 struct inode *inode, const char *name,
43 void *buffer, size_t size)
44{
45 struct afs_fs_cursor fc;
46 struct afs_status_cb *scb;
47 struct afs_vnode *vnode = AFS_FS_I(inode);
48 struct afs_acl *acl = NULL;
49 struct key *key;
50 int ret = -ENOMEM;
51
52 scb = kzalloc(sizeof(struct afs_status_cb), GFP_NOFS);
53 if (!scb)
54 goto error;
55
56 key = afs_request_key(vnode->volume->cell);
57 if (IS_ERR(key)) {
58 ret = PTR_ERR(key);
59 goto error_scb;
60 }
61
62 ret = -ERESTARTSYS;
63 if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
64 afs_dataversion_t data_version = vnode->status.data_version;
65
66 while (afs_select_fileserver(&fc)) {
67 fc.cb_break = afs_calc_vnode_cb_break(vnode);
68 acl = afs_fs_fetch_acl(&fc, scb);
69 }
70
71 afs_check_for_remote_deletion(&fc, fc.vnode);
72 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
73 &data_version, scb);
74 ret = afs_end_vnode_operation(&fc);
75 }
76
77 if (ret == 0) {
78 ret = acl->size;
79 if (size > 0) {
80 if (acl->size <= size)
81 memcpy(buffer, acl->data, acl->size);
82 else
83 ret = -ERANGE;
84 }
85 kfree(acl);
86 }
87
88 key_put(key);
89error_scb:
90 kfree(scb);
91error:
92 return ret;
93}
94
95
96
97
98static int afs_xattr_set_acl(const struct xattr_handler *handler,
99 struct dentry *dentry,
100 struct inode *inode, const char *name,
101 const void *buffer, size_t size, int flags)
102{
103 struct afs_fs_cursor fc;
104 struct afs_status_cb *scb;
105 struct afs_vnode *vnode = AFS_FS_I(inode);
106 struct afs_acl *acl = NULL;
107 struct key *key;
108 int ret = -ENOMEM;
109
110 if (flags == XATTR_CREATE)
111 return -EINVAL;
112
113 scb = kzalloc(sizeof(struct afs_status_cb), GFP_NOFS);
114 if (!scb)
115 goto error;
116
117 acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL);
118 if (!acl)
119 goto error_scb;
120
121 key = afs_request_key(vnode->volume->cell);
122 if (IS_ERR(key)) {
123 ret = PTR_ERR(key);
124 goto error_acl;
125 }
126
127 acl->size = size;
128 memcpy(acl->data, buffer, size);
129
130 ret = -ERESTARTSYS;
131 if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
132 afs_dataversion_t data_version = vnode->status.data_version;
133
134 while (afs_select_fileserver(&fc)) {
135 fc.cb_break = afs_calc_vnode_cb_break(vnode);
136 afs_fs_store_acl(&fc, acl, scb);
137 }
138
139 afs_check_for_remote_deletion(&fc, fc.vnode);
140 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
141 &data_version, scb);
142 ret = afs_end_vnode_operation(&fc);
143 }
144
145 key_put(key);
146error_acl:
147 kfree(acl);
148error_scb:
149 kfree(scb);
150error:
151 return ret;
152}
153
154static const struct xattr_handler afs_xattr_afs_acl_handler = {
155 .name = "afs.acl",
156 .get = afs_xattr_get_acl,
157 .set = afs_xattr_set_acl,
158};
159
160
161
162
163static int afs_xattr_get_yfs(const struct xattr_handler *handler,
164 struct dentry *dentry,
165 struct inode *inode, const char *name,
166 void *buffer, size_t size)
167{
168 struct afs_fs_cursor fc;
169 struct afs_status_cb *scb;
170 struct afs_vnode *vnode = AFS_FS_I(inode);
171 struct yfs_acl *yacl = NULL;
172 struct key *key;
173 char buf[16], *data;
174 int which = 0, dsize, ret = -ENOMEM;
175
176 if (strcmp(name, "acl") == 0)
177 which = 0;
178 else if (strcmp(name, "acl_inherited") == 0)
179 which = 1;
180 else if (strcmp(name, "acl_num_cleaned") == 0)
181 which = 2;
182 else if (strcmp(name, "vol_acl") == 0)
183 which = 3;
184 else
185 return -EOPNOTSUPP;
186
187 yacl = kzalloc(sizeof(struct yfs_acl), GFP_KERNEL);
188 if (!yacl)
189 goto error;
190
191 if (which == 0)
192 yacl->flags |= YFS_ACL_WANT_ACL;
193 else if (which == 3)
194 yacl->flags |= YFS_ACL_WANT_VOL_ACL;
195
196 scb = kzalloc(sizeof(struct afs_status_cb), GFP_NOFS);
197 if (!scb)
198 goto error_yacl;
199
200 key = afs_request_key(vnode->volume->cell);
201 if (IS_ERR(key)) {
202 ret = PTR_ERR(key);
203 goto error_scb;
204 }
205
206 ret = -ERESTARTSYS;
207 if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
208 afs_dataversion_t data_version = vnode->status.data_version;
209
210 while (afs_select_fileserver(&fc)) {
211 fc.cb_break = afs_calc_vnode_cb_break(vnode);
212 yfs_fs_fetch_opaque_acl(&fc, yacl, scb);
213 }
214
215 afs_check_for_remote_deletion(&fc, fc.vnode);
216 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
217 &data_version, scb);
218 ret = afs_end_vnode_operation(&fc);
219 }
220
221 if (ret < 0)
222 goto error_key;
223
224 switch (which) {
225 case 0:
226 data = yacl->acl->data;
227 dsize = yacl->acl->size;
228 break;
229 case 1:
230 data = buf;
231 dsize = snprintf(buf, sizeof(buf), "%u", yacl->inherit_flag);
232 break;
233 case 2:
234 data = buf;
235 dsize = snprintf(buf, sizeof(buf), "%u", yacl->num_cleaned);
236 break;
237 case 3:
238 data = yacl->vol_acl->data;
239 dsize = yacl->vol_acl->size;
240 break;
241 default:
242 ret = -EOPNOTSUPP;
243 goto error_key;
244 }
245
246 ret = dsize;
247 if (size > 0) {
248 if (dsize > size) {
249 ret = -ERANGE;
250 goto error_key;
251 }
252 memcpy(buffer, data, dsize);
253 }
254
255error_key:
256 key_put(key);
257error_scb:
258 kfree(scb);
259error_yacl:
260 yfs_free_opaque_acl(yacl);
261error:
262 return ret;
263}
264
265
266
267
268static int afs_xattr_set_yfs(const struct xattr_handler *handler,
269 struct dentry *dentry,
270 struct inode *inode, const char *name,
271 const void *buffer, size_t size, int flags)
272{
273 struct afs_fs_cursor fc;
274 struct afs_status_cb *scb;
275 struct afs_vnode *vnode = AFS_FS_I(inode);
276 struct afs_acl *acl = NULL;
277 struct key *key;
278 int ret = -ENOMEM;
279
280 if (flags == XATTR_CREATE ||
281 strcmp(name, "acl") != 0)
282 return -EINVAL;
283
284 scb = kzalloc(sizeof(struct afs_status_cb), GFP_NOFS);
285 if (!scb)
286 goto error;
287
288 acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL);
289 if (!acl)
290 goto error_scb;
291
292 acl->size = size;
293 memcpy(acl->data, buffer, size);
294
295 key = afs_request_key(vnode->volume->cell);
296 if (IS_ERR(key)) {
297 ret = PTR_ERR(key);
298 goto error_acl;
299 }
300
301 ret = -ERESTARTSYS;
302 if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
303 afs_dataversion_t data_version = vnode->status.data_version;
304
305 while (afs_select_fileserver(&fc)) {
306 fc.cb_break = afs_calc_vnode_cb_break(vnode);
307 yfs_fs_store_opaque_acl2(&fc, acl, scb);
308 }
309
310 afs_check_for_remote_deletion(&fc, fc.vnode);
311 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
312 &data_version, scb);
313 ret = afs_end_vnode_operation(&fc);
314 }
315
316error_acl:
317 kfree(acl);
318 key_put(key);
319error_scb:
320 kfree(scb);
321error:
322 return ret;
323}
324
325static const struct xattr_handler afs_xattr_yfs_handler = {
326 .prefix = "afs.yfs.",
327 .get = afs_xattr_get_yfs,
328 .set = afs_xattr_set_yfs,
329};
330
331
332
333
334static int afs_xattr_get_cell(const struct xattr_handler *handler,
335 struct dentry *dentry,
336 struct inode *inode, const char *name,
337 void *buffer, size_t size)
338{
339 struct afs_vnode *vnode = AFS_FS_I(inode);
340 struct afs_cell *cell = vnode->volume->cell;
341 size_t namelen;
342
343 namelen = cell->name_len;
344 if (size == 0)
345 return namelen;
346 if (namelen > size)
347 return -ERANGE;
348 memcpy(buffer, cell->name, namelen);
349 return namelen;
350}
351
352static const struct xattr_handler afs_xattr_afs_cell_handler = {
353 .name = "afs.cell",
354 .get = afs_xattr_get_cell,
355};
356
357
358
359
360
361static int afs_xattr_get_fid(const struct xattr_handler *handler,
362 struct dentry *dentry,
363 struct inode *inode, const char *name,
364 void *buffer, size_t size)
365{
366 struct afs_vnode *vnode = AFS_FS_I(inode);
367 char text[16 + 1 + 24 + 1 + 8 + 1];
368 size_t len;
369
370
371
372
373 len = sprintf(text, "%llx:", vnode->fid.vid);
374 if (vnode->fid.vnode_hi)
375 len += sprintf(text + len, "%x%016llx",
376 vnode->fid.vnode_hi, vnode->fid.vnode);
377 else
378 len += sprintf(text + len, "%llx", vnode->fid.vnode);
379 len += sprintf(text + len, ":%x", vnode->fid.unique);
380
381 if (size == 0)
382 return len;
383 if (len > size)
384 return -ERANGE;
385 memcpy(buffer, text, len);
386 return len;
387}
388
389static const struct xattr_handler afs_xattr_afs_fid_handler = {
390 .name = "afs.fid",
391 .get = afs_xattr_get_fid,
392};
393
394
395
396
397static int afs_xattr_get_volume(const struct xattr_handler *handler,
398 struct dentry *dentry,
399 struct inode *inode, const char *name,
400 void *buffer, size_t size)
401{
402 struct afs_vnode *vnode = AFS_FS_I(inode);
403 const char *volname = vnode->volume->name;
404 size_t namelen;
405
406 namelen = strlen(volname);
407 if (size == 0)
408 return namelen;
409 if (namelen > size)
410 return -ERANGE;
411 memcpy(buffer, volname, namelen);
412 return namelen;
413}
414
415static const struct xattr_handler afs_xattr_afs_volume_handler = {
416 .name = "afs.volume",
417 .get = afs_xattr_get_volume,
418};
419
420const struct xattr_handler *afs_xattr_handlers[] = {
421 &afs_xattr_afs_acl_handler,
422 &afs_xattr_afs_cell_handler,
423 &afs_xattr_afs_fid_handler,
424 &afs_xattr_afs_volume_handler,
425 &afs_xattr_yfs_handler,
426 NULL
427};
428
