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37#include <linux/fs.h>
38#include <linux/sched.h>
39#include <linux/mm.h>
40#include <linux/selinux.h>
41
42#define DEBUG_SUBSYSTEM S_LLITE
43
44#include "../include/obd_support.h"
45#include "../include/lustre_lite.h"
46#include "../include/lustre_dlm.h"
47#include "../include/lustre_ver.h"
48#include "../include/lustre_eacl.h"
49
50#include "llite_internal.h"
51
52#define XATTR_USER_T (1)
53#define XATTR_TRUSTED_T (2)
54#define XATTR_SECURITY_T (3)
55#define XATTR_ACL_ACCESS_T (4)
56#define XATTR_ACL_DEFAULT_T (5)
57#define XATTR_LUSTRE_T (6)
58#define XATTR_OTHER_T (7)
59
60static
61int get_xattr_type(const char *name)
62{
63 if (!strcmp(name, POSIX_ACL_XATTR_ACCESS))
64 return XATTR_ACL_ACCESS_T;
65
66 if (!strcmp(name, POSIX_ACL_XATTR_DEFAULT))
67 return XATTR_ACL_DEFAULT_T;
68
69 if (!strncmp(name, XATTR_USER_PREFIX,
70 sizeof(XATTR_USER_PREFIX) - 1))
71 return XATTR_USER_T;
72
73 if (!strncmp(name, XATTR_TRUSTED_PREFIX,
74 sizeof(XATTR_TRUSTED_PREFIX) - 1))
75 return XATTR_TRUSTED_T;
76
77 if (!strncmp(name, XATTR_SECURITY_PREFIX,
78 sizeof(XATTR_SECURITY_PREFIX) - 1))
79 return XATTR_SECURITY_T;
80
81 if (!strncmp(name, XATTR_LUSTRE_PREFIX,
82 sizeof(XATTR_LUSTRE_PREFIX) - 1))
83 return XATTR_LUSTRE_T;
84
85 return XATTR_OTHER_T;
86}
87
88static
89int xattr_type_filter(struct ll_sb_info *sbi, int xattr_type)
90{
91 if ((xattr_type == XATTR_ACL_ACCESS_T ||
92 xattr_type == XATTR_ACL_DEFAULT_T) &&
93 !(sbi->ll_flags & LL_SBI_ACL))
94 return -EOPNOTSUPP;
95
96 if (xattr_type == XATTR_USER_T && !(sbi->ll_flags & LL_SBI_USER_XATTR))
97 return -EOPNOTSUPP;
98 if (xattr_type == XATTR_TRUSTED_T && !capable(CFS_CAP_SYS_ADMIN))
99 return -EPERM;
100 if (xattr_type == XATTR_OTHER_T)
101 return -EOPNOTSUPP;
102
103 return 0;
104}
105
106static
107int ll_setxattr_common(struct inode *inode, const char *name,
108 const void *value, size_t size,
109 int flags, __u64 valid)
110{
111 struct ll_sb_info *sbi = ll_i2sbi(inode);
112 struct ptlrpc_request *req = NULL;
113 int xattr_type, rc;
114 struct obd_capa *oc;
115#ifdef CONFIG_FS_POSIX_ACL
116 struct rmtacl_ctl_entry *rce = NULL;
117 posix_acl_xattr_header *new_value = NULL;
118 ext_acl_xattr_header *acl = NULL;
119#endif
120 const char *pv = value;
121
122 xattr_type = get_xattr_type(name);
123 rc = xattr_type_filter(sbi, xattr_type);
124 if (rc)
125 return rc;
126
127 if ((xattr_type == XATTR_ACL_ACCESS_T ||
128 xattr_type == XATTR_ACL_DEFAULT_T) &&
129 !inode_owner_or_capable(inode))
130 return -EPERM;
131
132
133 if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) ||
134 (xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0))
135 return 0;
136
137
138 if ((xattr_type == XATTR_SECURITY_T &&
139 strcmp(name, "security.capability") == 0))
140 return 0;
141
142
143 if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
144 strcmp(name, "security.selinux") == 0)
145 return -EOPNOTSUPP;
146
147#ifdef CONFIG_FS_POSIX_ACL
148 if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
149 (xattr_type == XATTR_ACL_ACCESS_T ||
150 xattr_type == XATTR_ACL_DEFAULT_T)) {
151 rce = rct_search(&sbi->ll_rct, current_pid());
152 if (rce == NULL ||
153 (rce->rce_ops != RMT_LSETFACL &&
154 rce->rce_ops != RMT_RSETFACL))
155 return -EOPNOTSUPP;
156
157 if (rce->rce_ops == RMT_LSETFACL) {
158 struct eacl_entry *ee;
159
160 ee = et_search_del(&sbi->ll_et, current_pid(),
161 ll_inode2fid(inode), xattr_type);
162 LASSERT(ee != NULL);
163 if (valid & OBD_MD_FLXATTR) {
164 acl = lustre_acl_xattr_merge2ext(
165 (posix_acl_xattr_header *)value,
166 size, ee->ee_acl);
167 if (IS_ERR(acl)) {
168 ee_free(ee);
169 return PTR_ERR(acl);
170 }
171 size = CFS_ACL_XATTR_SIZE(\
172 le32_to_cpu(acl->a_count), \
173 ext_acl_xattr);
174 pv = (const char *)acl;
175 }
176 ee_free(ee);
177 } else if (rce->rce_ops == RMT_RSETFACL) {
178 size = lustre_posix_acl_xattr_filter(
179 (posix_acl_xattr_header *)value,
180 size, &new_value);
181 if (unlikely(size < 0))
182 return size;
183
184 pv = (const char *)new_value;
185 } else
186 return -EOPNOTSUPP;
187
188 valid |= rce_ops2valid(rce->rce_ops);
189 }
190#endif
191 oc = ll_mdscapa_get(inode);
192 rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
193 valid, name, pv, size, 0, flags,
194 ll_i2suppgid(inode), &req);
195 capa_put(oc);
196#ifdef CONFIG_FS_POSIX_ACL
197 if (new_value != NULL)
198 lustre_posix_acl_xattr_free(new_value, size);
199 if (acl != NULL)
200 lustre_ext_acl_xattr_free(acl);
201#endif
202 if (rc) {
203 if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
204 LCONSOLE_INFO("Disabling user_xattr feature because it is not supported on the server\n");
205 sbi->ll_flags &= ~LL_SBI_USER_XATTR;
206 }
207 return rc;
208 }
209
210 ptlrpc_req_finished(req);
211 return 0;
212}
213
214int ll_setxattr(struct dentry *dentry, const char *name,
215 const void *value, size_t size, int flags)
216{
217 struct inode *inode = d_inode(dentry);
218
219 LASSERT(inode);
220 LASSERT(name);
221
222 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
223 inode->i_ino, inode->i_generation, inode, name);
224
225 ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);
226
227 if ((strncmp(name, XATTR_TRUSTED_PREFIX,
228 sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
229 strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
230 (strncmp(name, XATTR_LUSTRE_PREFIX,
231 sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
232 strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
233 struct lov_user_md *lump = (struct lov_user_md *)value;
234 int rc = 0;
235
236 if (size != 0 && size < sizeof(struct lov_user_md))
237 return -EINVAL;
238
239
240
241
242 if (lump != NULL && lump->lmm_stripe_offset == 0)
243 lump->lmm_stripe_offset = -1;
244
245 if (lump != NULL && S_ISREG(inode->i_mode)) {
246 int flags = FMODE_WRITE;
247 int lum_size = (lump->lmm_magic == LOV_USER_MAGIC_V1) ?
248 sizeof(*lump) : sizeof(struct lov_user_md_v3);
249
250 rc = ll_lov_setstripe_ea_info(inode, dentry, flags, lump,
251 lum_size);
252
253 rc = 0;
254 } else if (S_ISDIR(inode->i_mode)) {
255 rc = ll_dir_setstripe(inode, lump, 0);
256 }
257
258 return rc;
259
260 } else if (strcmp(name, XATTR_NAME_LMA) == 0 ||
261 strcmp(name, XATTR_NAME_LINK) == 0)
262 return 0;
263
264 return ll_setxattr_common(inode, name, value, size, flags,
265 OBD_MD_FLXATTR);
266}
267
268int ll_removexattr(struct dentry *dentry, const char *name)
269{
270 struct inode *inode = d_inode(dentry);
271
272 LASSERT(inode);
273 LASSERT(name);
274
275 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
276 inode->i_ino, inode->i_generation, inode, name);
277
278 ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
279 return ll_setxattr_common(inode, name, NULL, 0, 0,
280 OBD_MD_FLXATTRRM);
281}
282
283static
284int ll_getxattr_common(struct inode *inode, const char *name,
285 void *buffer, size_t size, __u64 valid)
286{
287 struct ll_sb_info *sbi = ll_i2sbi(inode);
288 struct ptlrpc_request *req = NULL;
289 struct mdt_body *body;
290 int xattr_type, rc;
291 void *xdata;
292 struct obd_capa *oc;
293 struct rmtacl_ctl_entry *rce = NULL;
294 struct ll_inode_info *lli = ll_i2info(inode);
295
296 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
297 inode->i_ino, inode->i_generation, inode);
298
299
300
301
302
303 if (!name) {
304 xattr_type = XATTR_OTHER_T;
305 goto do_getxattr;
306 }
307
308 xattr_type = get_xattr_type(name);
309 rc = xattr_type_filter(sbi, xattr_type);
310 if (rc)
311 return rc;
312
313
314 if ((xattr_type == XATTR_SECURITY_T &&
315 strcmp(name, "security.capability") == 0))
316 return -ENODATA;
317
318
319 if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
320 strcmp(name, "security.selinux") == 0)
321 return -EOPNOTSUPP;
322
323#ifdef CONFIG_FS_POSIX_ACL
324 if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
325 (xattr_type == XATTR_ACL_ACCESS_T ||
326 xattr_type == XATTR_ACL_DEFAULT_T)) {
327 rce = rct_search(&sbi->ll_rct, current_pid());
328 if (rce == NULL ||
329 (rce->rce_ops != RMT_LSETFACL &&
330 rce->rce_ops != RMT_LGETFACL &&
331 rce->rce_ops != RMT_RSETFACL &&
332 rce->rce_ops != RMT_RGETFACL))
333 return -EOPNOTSUPP;
334 }
335
336
337
338
339
340 if (xattr_type == XATTR_ACL_ACCESS_T &&
341 !(sbi->ll_flags & LL_SBI_RMT_CLIENT)) {
342
343 struct posix_acl *acl;
344
345 spin_lock(&lli->lli_lock);
346 acl = posix_acl_dup(lli->lli_posix_acl);
347 spin_unlock(&lli->lli_lock);
348
349 if (!acl)
350 return -ENODATA;
351
352 rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
353 posix_acl_release(acl);
354 return rc;
355 }
356 if (xattr_type == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode))
357 return -ENODATA;
358#endif
359
360do_getxattr:
361 if (sbi->ll_xattr_cache_enabled && xattr_type != XATTR_ACL_ACCESS_T) {
362 rc = ll_xattr_cache_get(inode, name, buffer, size, valid);
363 if (rc == -EAGAIN)
364 goto getxattr_nocache;
365 if (rc < 0)
366 goto out_xattr;
367
368
369 if (lli->lli_posix_acl != NULL && valid & OBD_MD_FLXATTRLS) {
370 if (size == 0) {
371 rc += sizeof(XATTR_NAME_ACL_ACCESS);
372 } else if (size - rc >= sizeof(XATTR_NAME_ACL_ACCESS)) {
373 memcpy(buffer + rc, XATTR_NAME_ACL_ACCESS,
374 sizeof(XATTR_NAME_ACL_ACCESS));
375 rc += sizeof(XATTR_NAME_ACL_ACCESS);
376 } else {
377 rc = -ERANGE;
378 goto out_xattr;
379 }
380 }
381 } else {
382getxattr_nocache:
383 oc = ll_mdscapa_get(inode);
384 rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
385 valid | (rce ? rce_ops2valid(rce->rce_ops) : 0),
386 name, NULL, 0, size, 0, &req);
387 capa_put(oc);
388
389 if (rc < 0)
390 goto out_xattr;
391
392 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
393 LASSERT(body);
394
395
396 if (size == 0) {
397 rc = body->eadatasize;
398 goto out;
399 }
400
401 if (size < body->eadatasize) {
402 CERROR("server bug: replied size %u > %u\n",
403 body->eadatasize, (int)size);
404 rc = -ERANGE;
405 goto out;
406 }
407
408 if (body->eadatasize == 0) {
409 rc = -ENODATA;
410 goto out;
411 }
412
413
414 xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
415 body->eadatasize);
416 if (!xdata) {
417 rc = -EFAULT;
418 goto out;
419 }
420
421 memcpy(buffer, xdata, body->eadatasize);
422 rc = body->eadatasize;
423 }
424
425#ifdef CONFIG_FS_POSIX_ACL
426 if (rce && rce->rce_ops == RMT_LSETFACL) {
427 ext_acl_xattr_header *acl;
428
429 acl = lustre_posix_acl_xattr_2ext(
430 (posix_acl_xattr_header *)buffer, rc);
431 if (IS_ERR(acl)) {
432 rc = PTR_ERR(acl);
433 goto out;
434 }
435
436 rc = ee_add(&sbi->ll_et, current_pid(), ll_inode2fid(inode),
437 xattr_type, acl);
438 if (unlikely(rc < 0)) {
439 lustre_ext_acl_xattr_free(acl);
440 goto out;
441 }
442 }
443#endif
444
445out_xattr:
446 if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
447 LCONSOLE_INFO(
448 "%s: disabling user_xattr feature because it is not supported on the server: rc = %d\n",
449 ll_get_fsname(inode->i_sb, NULL, 0), rc);
450 sbi->ll_flags &= ~LL_SBI_USER_XATTR;
451 }
452out:
453 ptlrpc_req_finished(req);
454 return rc;
455}
456
457ssize_t ll_getxattr(struct dentry *dentry, const char *name,
458 void *buffer, size_t size)
459{
460 struct inode *inode = d_inode(dentry);
461
462 LASSERT(inode);
463 LASSERT(name);
464
465 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
466 inode->i_ino, inode->i_generation, inode, name);
467
468 ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);
469
470 if ((strncmp(name, XATTR_TRUSTED_PREFIX,
471 sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
472 strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
473 (strncmp(name, XATTR_LUSTRE_PREFIX,
474 sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
475 strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
476 struct lov_stripe_md *lsm;
477 struct lov_user_md *lump;
478 struct lov_mds_md *lmm = NULL;
479 struct ptlrpc_request *request = NULL;
480 int rc = 0, lmmsize = 0;
481
482 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
483 return -ENODATA;
484
485 if (size == 0 && S_ISDIR(inode->i_mode)) {
486
487
488 rc = sizeof(struct lov_user_md);
489 goto out;
490 }
491
492 lsm = ccc_inode_lsm_get(inode);
493 if (lsm == NULL) {
494 if (S_ISDIR(inode->i_mode)) {
495 rc = ll_dir_getstripe(inode, &lmm,
496 &lmmsize, &request);
497 } else {
498 rc = -ENODATA;
499 }
500 } else {
501
502
503 rc = obd_packmd(ll_i2dtexp(inode), &lmm, lsm);
504 lmmsize = rc;
505 }
506 ccc_inode_lsm_put(inode, lsm);
507
508 if (rc < 0)
509 goto out;
510
511 if (size == 0) {
512
513
514
515
516 rc = lmmsize;
517 goto out;
518 }
519
520 if (size < lmmsize) {
521 CERROR("server bug: replied size %d > %d for %pd (%s)\n",
522 lmmsize, (int)size, dentry, name);
523 rc = -ERANGE;
524 goto out;
525 }
526
527 lump = (struct lov_user_md *)buffer;
528 memcpy(lump, lmm, lmmsize);
529
530
531
532 lump->lmm_layout_gen = 0;
533
534 rc = lmmsize;
535out:
536 if (request)
537 ptlrpc_req_finished(request);
538 else if (lmm)
539 obd_free_diskmd(ll_i2dtexp(inode), &lmm);
540 return rc;
541 }
542
543 return ll_getxattr_common(inode, name, buffer, size, OBD_MD_FLXATTR);
544}
545
546ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size)
547{
548 struct inode *inode = d_inode(dentry);
549 int rc = 0, rc2 = 0;
550 struct lov_mds_md *lmm = NULL;
551 struct ptlrpc_request *request = NULL;
552 int lmmsize;
553
554 LASSERT(inode);
555
556 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
557 inode->i_ino, inode->i_generation, inode);
558
559 ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LISTXATTR, 1);
560
561 rc = ll_getxattr_common(inode, NULL, buffer, size, OBD_MD_FLXATTRLS);
562 if (rc < 0)
563 goto out;
564
565 if (buffer != NULL) {
566 struct ll_sb_info *sbi = ll_i2sbi(inode);
567 char *xattr_name = buffer;
568 int xlen, rem = rc;
569
570 while (rem > 0) {
571 xlen = strnlen(xattr_name, rem - 1) + 1;
572 rem -= xlen;
573 if (xattr_type_filter(sbi,
574 get_xattr_type(xattr_name)) == 0) {
575
576
577
578 xattr_name += xlen;
579 continue;
580 }
581
582
583
584 memmove(xattr_name, xattr_name + xlen, rem);
585 rc -= xlen;
586 }
587 }
588 if (S_ISREG(inode->i_mode)) {
589 if (!ll_i2info(inode)->lli_has_smd)
590 rc2 = -1;
591 } else if (S_ISDIR(inode->i_mode)) {
592 rc2 = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
593 }
594
595 if (rc2 < 0) {
596 rc2 = 0;
597 goto out;
598 } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) {
599 const int prefix_len = sizeof(XATTR_LUSTRE_PREFIX) - 1;
600 const size_t name_len = sizeof("lov") - 1;
601 const size_t total_len = prefix_len + name_len + 1;
602
603 if (((rc + total_len) > size) && (buffer != NULL)) {
604 ptlrpc_req_finished(request);
605 return -ERANGE;
606 }
607
608 if (buffer != NULL) {
609 buffer += rc;
610 memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len);
611 memcpy(buffer + prefix_len, "lov", name_len);
612 buffer[prefix_len + name_len] = '\0';
613 }
614 rc2 = total_len;
615 }
616out:
617 ptlrpc_req_finished(request);
618 rc = rc + rc2;
619
620 return rc;
621}
622
