1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/ocfs2/ioctl.c
4 *
5 * Copyright (C) 2006 Herbert Poetzl
6 * adapted from Remy Card's ext2/ioctl.c
7 */
8
9 #include <linux/fs.h>
10 #include <linux/mount.h>
11 #include <linux/blkdev.h>
12 #include <linux/compat.h>
13 #include <linux/fileattr.h>
14
15 #include <cluster/masklog.h>
16
17 #include "ocfs2.h"
18 #include "alloc.h"
19 #include "dlmglue.h"
20 #include "file.h"
21 #include "inode.h"
22 #include "journal.h"
23
24 #include "ocfs2_fs.h"
25 #include "ioctl.h"
26 #include "resize.h"
27 #include "refcounttree.h"
28 #include "sysfile.h"
29 #include "dir.h"
30 #include "buffer_head_io.h"
31 #include "suballoc.h"
32 #include "move_extents.h"
33
34 #define o2info_from_user(a, b) \
35 copy_from_user(&(a), (b), sizeof(a))
36 #define o2info_to_user(a, b) \
37 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
38
39 /*
40 * This is just a best-effort to tell userspace that this request
41 * caused the error.
42 */
43 static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
44 struct ocfs2_info_request __user *req)
45 {
46 kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
47 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
48 }
49
50 static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
51 {
52 req->ir_flags |= OCFS2_INFO_FL_FILLED;
53 }
54
55 static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
56 {
57 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
58 }
59
60 static inline int o2info_coherent(struct ocfs2_info_request *req)
61 {
62 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
63 }
64
65 int ocfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
66 {
67 struct inode *inode = d_inode(dentry);
68 unsigned int flags;
69 int status;
70
71 status = ocfs2_inode_lock(inode, NULL, 0);
72 if (status < 0) {
73 mlog_errno(status);
74 return status;
75 }
76 ocfs2_get_inode_flags(OCFS2_I(inode));
77 flags = OCFS2_I(inode)->ip_attr;
78 ocfs2_inode_unlock(inode, 0);
79
80 fileattr_fill_flags(fa, flags & OCFS2_FL_VISIBLE);
81
82 return status;
83 }
84
85 int ocfs2_fileattr_set(struct mnt_idmap *idmap,
86 struct dentry *dentry, struct fileattr *fa)
87 {
88 struct inode *inode = d_inode(dentry);
89 unsigned int flags = fa->flags;
90 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
91 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
92 handle_t *handle = NULL;
93 struct buffer_head *bh = NULL;
94 unsigned oldflags;
95 int status;
96
97 if (fileattr_has_fsx(fa))
98 return -EOPNOTSUPP;
99
100 status = ocfs2_inode_lock(inode, &bh, 1);
101 if (status < 0) {
102 mlog_errno(status);
103 goto bail;
104 }
105
106 if (!S_ISDIR(inode->i_mode))
107 flags &= ~OCFS2_DIRSYNC_FL;
108
109 oldflags = ocfs2_inode->ip_attr;
110 flags = flags & OCFS2_FL_MODIFIABLE;
111 flags |= oldflags & ~OCFS2_FL_MODIFIABLE;
112
113 /* Check already done by VFS, but repeat with ocfs lock */
114 status = -EPERM;
115 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
116 !capable(CAP_LINUX_IMMUTABLE))
117 goto bail_unlock;
118
119 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
120 if (IS_ERR(handle)) {
121 status = PTR_ERR(handle);
122 mlog_errno(status);
123 goto bail_unlock;
124 }
125
126 ocfs2_inode->ip_attr = flags;
127 ocfs2_set_inode_flags(inode);
128 inode_set_ctime_current(inode);
129
130 status = ocfs2_mark_inode_dirty(handle, inode, bh);
131 if (status < 0)
132 mlog_errno(status);
133
134 ocfs2_commit_trans(osb, handle);
135
136 bail_unlock:
137 ocfs2_inode_unlock(inode, 1);
138 bail:
139 brelse(bh);
140
141 return status;
142 }
143
144 static int ocfs2_info_handle_blocksize(struct inode *inode,
145 struct ocfs2_info_request __user *req)
146 {
147 struct ocfs2_info_blocksize oib;
148
149 if (o2info_from_user(oib, req))
150 return -EFAULT;
151
152 oib.ib_blocksize = inode->i_sb->s_blocksize;
153
154 o2info_set_request_filled(&oib.ib_req);
155
156 if (o2info_to_user(oib, req))
157 return -EFAULT;
158
159 return 0;
160 }
161
162 static int ocfs2_info_handle_clustersize(struct inode *inode,
163 struct ocfs2_info_request __user *req)
164 {
165 struct ocfs2_info_clustersize oic;
166 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
167
168 if (o2info_from_user(oic, req))
169 return -EFAULT;
170
171 oic.ic_clustersize = osb->s_clustersize;
172
173 o2info_set_request_filled(&oic.ic_req);
174
175 if (o2info_to_user(oic, req))
176 return -EFAULT;
177
178 return 0;
179 }
180
181 static int ocfs2_info_handle_maxslots(struct inode *inode,
182 struct ocfs2_info_request __user *req)
183 {
184 struct ocfs2_info_maxslots oim;
185 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
186
187 if (o2info_from_user(oim, req))
188 return -EFAULT;
189
190 oim.im_max_slots = osb->max_slots;
191
192 o2info_set_request_filled(&oim.im_req);
193
194 if (o2info_to_user(oim, req))
195 return -EFAULT;
196
197 return 0;
198 }
199
200 static int ocfs2_info_handle_label(struct inode *inode,
201 struct ocfs2_info_request __user *req)
202 {
203 struct ocfs2_info_label oil;
204 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
205
206 if (o2info_from_user(oil, req))
207 return -EFAULT;
208
209 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
210
211 o2info_set_request_filled(&oil.il_req);
212
213 if (o2info_to_user(oil, req))
214 return -EFAULT;
215
216 return 0;
217 }
218
219 static int ocfs2_info_handle_uuid(struct inode *inode,
220 struct ocfs2_info_request __user *req)
221 {
222 struct ocfs2_info_uuid oiu;
223 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
224
225 if (o2info_from_user(oiu, req))
226 return -EFAULT;
227
228 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
229
230 o2info_set_request_filled(&oiu.iu_req);
231
232 if (o2info_to_user(oiu, req))
233 return -EFAULT;
234
235 return 0;
236 }
237
238 static int ocfs2_info_handle_fs_features(struct inode *inode,
239 struct ocfs2_info_request __user *req)
240 {
241 struct ocfs2_info_fs_features oif;
242 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
243
244 if (o2info_from_user(oif, req))
245 return -EFAULT;
246
247 oif.if_compat_features = osb->s_feature_compat;
248 oif.if_incompat_features = osb->s_feature_incompat;
249 oif.if_ro_compat_features = osb->s_feature_ro_compat;
250
251 o2info_set_request_filled(&oif.if_req);
252
253 if (o2info_to_user(oif, req))
254 return -EFAULT;
255
256 return 0;
257 }
258
259 static int ocfs2_info_handle_journal_size(struct inode *inode,
260 struct ocfs2_info_request __user *req)
261 {
262 struct ocfs2_info_journal_size oij;
263 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
264
265 if (o2info_from_user(oij, req))
266 return -EFAULT;
267
268 oij.ij_journal_size = i_size_read(osb->journal->j_inode);
269
270 o2info_set_request_filled(&oij.ij_req);
271
272 if (o2info_to_user(oij, req))
273 return -EFAULT;
274
275 return 0;
276 }
277
278 static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
279 struct inode *inode_alloc, u64 blkno,
280 struct ocfs2_info_freeinode *fi,
281 u32 slot)
282 {
283 int status = 0, unlock = 0;
284
285 struct buffer_head *bh = NULL;
286 struct ocfs2_dinode *dinode_alloc = NULL;
287
288 if (inode_alloc)
289 inode_lock(inode_alloc);
290
291 if (inode_alloc && o2info_coherent(&fi->ifi_req)) {
292 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
293 if (status < 0) {
294 mlog_errno(status);
295 goto bail;
296 }
297 unlock = 1;
298 } else {
299 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
300 if (status < 0) {
301 mlog_errno(status);
302 goto bail;
303 }
304 }
305
306 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
307
308 fi->ifi_stat[slot].lfi_total =
309 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
310 fi->ifi_stat[slot].lfi_free =
311 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
312 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
313
314 bail:
315 if (unlock)
316 ocfs2_inode_unlock(inode_alloc, 0);
317
318 if (inode_alloc)
319 inode_unlock(inode_alloc);
320
321 brelse(bh);
322
323 return status;
324 }
325
326 static int ocfs2_info_handle_freeinode(struct inode *inode,
327 struct ocfs2_info_request __user *req)
328 {
329 u32 i;
330 u64 blkno = -1;
331 char namebuf[40];
332 int status, type = INODE_ALLOC_SYSTEM_INODE;
333 struct ocfs2_info_freeinode *oifi = NULL;
334 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
335 struct inode *inode_alloc = NULL;
336
337 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
338 if (!oifi) {
339 status = -ENOMEM;
340 mlog_errno(status);
341 goto out_err;
342 }
343
344 if (o2info_from_user(*oifi, req)) {
345 status = -EFAULT;
346 goto out_free;
347 }
348
349 oifi->ifi_slotnum = osb->max_slots;
350
351 for (i = 0; i < oifi->ifi_slotnum; i++) {
352 if (o2info_coherent(&oifi->ifi_req)) {
353 inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
354 if (!inode_alloc) {
355 mlog(ML_ERROR, "unable to get alloc inode in "
356 "slot %u\n", i);
357 status = -EIO;
358 goto bail;
359 }
360 } else {
361 ocfs2_sprintf_system_inode_name(namebuf,
362 sizeof(namebuf),
363 type, i);
364 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
365 namebuf,
366 strlen(namebuf),
367 &blkno);
368 if (status < 0) {
369 status = -ENOENT;
370 goto bail;
371 }
372 }
373
374 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
375
376 iput(inode_alloc);
377 inode_alloc = NULL;
378
379 if (status < 0)
380 goto bail;
381 }
382
383 o2info_set_request_filled(&oifi->ifi_req);
384
385 if (o2info_to_user(*oifi, req)) {
386 status = -EFAULT;
387 goto out_free;
388 }
389
390 status = 0;
391 bail:
392 if (status)
393 o2info_set_request_error(&oifi->ifi_req, req);
394 out_free:
395 kfree(oifi);
396 out_err:
397 return status;
398 }
399
400 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
401 unsigned int chunksize)
402 {
403 u32 index;
404
405 index = __ilog2_u32(chunksize);
406 if (index >= OCFS2_INFO_MAX_HIST)
407 index = OCFS2_INFO_MAX_HIST - 1;
408
409 hist->fc_chunks[index]++;
410 hist->fc_clusters[index] += chunksize;
411 }
412
413 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
414 unsigned int chunksize)
415 {
416 if (chunksize > stats->ffs_max)
417 stats->ffs_max = chunksize;
418
419 if (chunksize < stats->ffs_min)
420 stats->ffs_min = chunksize;
421
422 stats->ffs_avg += chunksize;
423 stats->ffs_free_chunks_real++;
424 }
425
426 static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
427 unsigned int chunksize)
428 {
429 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
430 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
431 }
432
433 static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
434 struct inode *gb_inode,
435 struct ocfs2_dinode *gb_dinode,
436 struct ocfs2_chain_rec *rec,
437 struct ocfs2_info_freefrag *ffg,
438 u32 chunks_in_group)
439 {
440 int status = 0, used;
441 u64 blkno;
442
443 struct buffer_head *bh = NULL;
444 struct ocfs2_group_desc *bg = NULL;
445
446 unsigned int max_bits, num_clusters;
447 unsigned int offset = 0, cluster, chunk;
448 unsigned int chunk_free, last_chunksize = 0;
449
450 if (!le32_to_cpu(rec->c_free))
451 goto bail;
452
453 do {
454 if (!bg)
455 blkno = le64_to_cpu(rec->c_blkno);
456 else
457 blkno = le64_to_cpu(bg->bg_next_group);
458
459 if (bh) {
460 brelse(bh);
461 bh = NULL;
462 }
463
464 if (o2info_coherent(&ffg->iff_req))
465 status = ocfs2_read_group_descriptor(gb_inode,
466 gb_dinode,
467 blkno, &bh);
468 else
469 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
470
471 if (status < 0) {
472 mlog(ML_ERROR, "Can't read the group descriptor # "
473 "%llu from device.", (unsigned long long)blkno);
474 status = -EIO;
475 goto bail;
476 }
477
478 bg = (struct ocfs2_group_desc *)bh->b_data;
479
480 if (!le16_to_cpu(bg->bg_free_bits_count))
481 continue;
482
483 max_bits = le16_to_cpu(bg->bg_bits);
484 offset = 0;
485
486 for (chunk = 0; chunk < chunks_in_group; chunk++) {
487 /*
488 * last chunk may be not an entire one.
489 */
490 if ((offset + ffg->iff_chunksize) > max_bits)
491 num_clusters = max_bits - offset;
492 else
493 num_clusters = ffg->iff_chunksize;
494
495 chunk_free = 0;
496 for (cluster = 0; cluster < num_clusters; cluster++) {
497 used = ocfs2_test_bit(offset,
498 (unsigned long *)bg->bg_bitmap);
499 /*
500 * - chunk_free counts free clusters in #N chunk.
501 * - last_chunksize records the size(in) clusters
502 * for the last real free chunk being counted.
503 */
504 if (!used) {
505 last_chunksize++;
506 chunk_free++;
507 }
508
509 if (used && last_chunksize) {
510 ocfs2_info_update_ffg(ffg,
511 last_chunksize);
512 last_chunksize = 0;
513 }
514
515 offset++;
516 }
517
518 if (chunk_free == ffg->iff_chunksize)
519 ffg->iff_ffs.ffs_free_chunks++;
520 }
521
522 /*
523 * need to update the info for last free chunk.
524 */
525 if (last_chunksize)
526 ocfs2_info_update_ffg(ffg, last_chunksize);
527
528 } while (le64_to_cpu(bg->bg_next_group));
529
530 bail:
531 brelse(bh);
532
533 return status;
534 }
535
536 static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
537 struct inode *gb_inode, u64 blkno,
538 struct ocfs2_info_freefrag *ffg)
539 {
540 u32 chunks_in_group;
541 int status = 0, unlock = 0, i;
542
543 struct buffer_head *bh = NULL;
544 struct ocfs2_chain_list *cl = NULL;
545 struct ocfs2_chain_rec *rec = NULL;
546 struct ocfs2_dinode *gb_dinode = NULL;
547
548 if (gb_inode)
549 inode_lock(gb_inode);
550
551 if (o2info_coherent(&ffg->iff_req)) {
552 status = ocfs2_inode_lock(gb_inode, &bh, 0);
553 if (status < 0) {
554 mlog_errno(status);
555 goto bail;
556 }
557 unlock = 1;
558 } else {
559 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
560 if (status < 0) {
561 mlog_errno(status);
562 goto bail;
563 }
564 }
565
566 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
567 cl = &(gb_dinode->id2.i_chain);
568
569 /*
570 * Chunksize(in) clusters from userspace should be
571 * less than clusters in a group.
572 */
573 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
574 status = -EINVAL;
575 goto bail;
576 }
577
578 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
579
580 ffg->iff_ffs.ffs_min = ~0U;
581 ffg->iff_ffs.ffs_clusters =
582 le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
583 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
584 le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
585
586 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
587
588 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
589 rec = &(cl->cl_recs[i]);
590 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
591 gb_dinode,
592 rec, ffg,
593 chunks_in_group);
594 if (status)
595 goto bail;
596 }
597
598 if (ffg->iff_ffs.ffs_free_chunks_real)
599 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
600 ffg->iff_ffs.ffs_free_chunks_real);
601 bail:
602 if (unlock)
603 ocfs2_inode_unlock(gb_inode, 0);
604
605 if (gb_inode)
606 inode_unlock(gb_inode);
607
608 iput(gb_inode);
609 brelse(bh);
610
611 return status;
612 }
613
614 static int ocfs2_info_handle_freefrag(struct inode *inode,
615 struct ocfs2_info_request __user *req)
616 {
617 u64 blkno = -1;
618 char namebuf[40];
619 int status, type = GLOBAL_BITMAP_SYSTEM_INODE;
620
621 struct ocfs2_info_freefrag *oiff;
622 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
623 struct inode *gb_inode = NULL;
624
625 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
626 if (!oiff) {
627 status = -ENOMEM;
628 mlog_errno(status);
629 goto out_err;
630 }
631
632 if (o2info_from_user(*oiff, req)) {
633 status = -EFAULT;
634 goto out_free;
635 }
636 /*
637 * chunksize from userspace should be power of 2.
638 */
639 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
640 (!oiff->iff_chunksize)) {
641 status = -EINVAL;
642 goto bail;
643 }
644
645 if (o2info_coherent(&oiff->iff_req)) {
646 gb_inode = ocfs2_get_system_file_inode(osb, type,
647 OCFS2_INVALID_SLOT);
648 if (!gb_inode) {
649 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
650 status = -EIO;
651 goto bail;
652 }
653 } else {
654 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
655 OCFS2_INVALID_SLOT);
656 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
657 namebuf,
658 strlen(namebuf),
659 &blkno);
660 if (status < 0) {
661 status = -ENOENT;
662 goto bail;
663 }
664 }
665
666 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
667 if (status < 0)
668 goto bail;
669
670 o2info_set_request_filled(&oiff->iff_req);
671
672 if (o2info_to_user(*oiff, req)) {
673 status = -EFAULT;
674 goto out_free;
675 }
676
677 status = 0;
678 bail:
679 if (status)
680 o2info_set_request_error(&oiff->iff_req, req);
681 out_free:
682 kfree(oiff);
683 out_err:
684 return status;
685 }
686
687 static int ocfs2_info_handle_unknown(struct inode *inode,
688 struct ocfs2_info_request __user *req)
689 {
690 struct ocfs2_info_request oir;
691
692 if (o2info_from_user(oir, req))
693 return -EFAULT;
694
695 o2info_clear_request_filled(&oir);
696
697 if (o2info_to_user(oir, req))
698 return -EFAULT;
699
700 return 0;
701 }
702
703 /*
704 * Validate and distinguish OCFS2_IOC_INFO requests.
705 *
706 * - validate the magic number.
707 * - distinguish different requests.
708 * - validate size of different requests.
709 */
710 static int ocfs2_info_handle_request(struct inode *inode,
711 struct ocfs2_info_request __user *req)
712 {
713 int status = -EFAULT;
714 struct ocfs2_info_request oir;
715
716 if (o2info_from_user(oir, req))
717 goto bail;
718
719 status = -EINVAL;
720 if (oir.ir_magic != OCFS2_INFO_MAGIC)
721 goto bail;
722
723 switch (oir.ir_code) {
724 case OCFS2_INFO_BLOCKSIZE:
725 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
726 status = ocfs2_info_handle_blocksize(inode, req);
727 break;
728 case OCFS2_INFO_CLUSTERSIZE:
729 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
730 status = ocfs2_info_handle_clustersize(inode, req);
731 break;
732 case OCFS2_INFO_MAXSLOTS:
733 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
734 status = ocfs2_info_handle_maxslots(inode, req);
735 break;
736 case OCFS2_INFO_LABEL:
737 if (oir.ir_size == sizeof(struct ocfs2_info_label))
738 status = ocfs2_info_handle_label(inode, req);
739 break;
740 case OCFS2_INFO_UUID:
741 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
742 status = ocfs2_info_handle_uuid(inode, req);
743 break;
744 case OCFS2_INFO_FS_FEATURES:
745 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
746 status = ocfs2_info_handle_fs_features(inode, req);
747 break;
748 case OCFS2_INFO_JOURNAL_SIZE:
749 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
750 status = ocfs2_info_handle_journal_size(inode, req);
751 break;
752 case OCFS2_INFO_FREEINODE:
753 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
754 status = ocfs2_info_handle_freeinode(inode, req);
755 break;
756 case OCFS2_INFO_FREEFRAG:
757 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
758 status = ocfs2_info_handle_freefrag(inode, req);
759 break;
760 default:
761 status = ocfs2_info_handle_unknown(inode, req);
762 break;
763 }
764
765 bail:
766 return status;
767 }
768
769 static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
770 u64 *req_addr, int compat_flag)
771 {
772 int status = -EFAULT;
773 u64 __user *bp = NULL;
774
775 if (compat_flag) {
776 #ifdef CONFIG_COMPAT
777 /*
778 * pointer bp stores the base address of a pointers array,
779 * which collects all addresses of separate request.
780 */
781 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
782 #else
783 BUG();
784 #endif
785 } else
786 bp = (u64 __user *)(unsigned long)(info->oi_requests);
787
788 if (o2info_from_user(*req_addr, bp + idx))
789 goto bail;
790
791 status = 0;
792 bail:
793 return status;
794 }
795
796 /*
797 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
798 *
799 * ocfs2_info_handle() recevies a large info aggregation, grab and
800 * validate the request count from header, then break it into small
801 * pieces, later specific handlers can handle them one by one.
802 *
803 * Idea here is to make each separate request small enough to ensure
804 * a better backward&forward compatibility, since a small piece of
805 * request will be less likely to be broken if disk layout get changed.
806 */
807 static noinline_for_stack int
808 ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, int compat_flag)
809 {
810 int i, status = 0;
811 u64 req_addr;
812 struct ocfs2_info_request __user *reqp;
813
814 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
815 (!info->oi_requests)) {
816 status = -EINVAL;
817 goto bail;
818 }
819
820 for (i = 0; i < info->oi_count; i++) {
821
822 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
823 if (status)
824 break;
825
826 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
827 if (!reqp) {
828 status = -EINVAL;
829 goto bail;
830 }
831
832 status = ocfs2_info_handle_request(inode, reqp);
833 if (status)
834 break;
835 }
836
837 bail:
838 return status;
839 }
840
841 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
842 {
843 struct inode *inode = file_inode(filp);
844 void __user *argp = (void __user *)arg;
845 int status;
846
847 switch (cmd) {
848 case OCFS2_IOC_RESVSP:
849 case OCFS2_IOC_RESVSP64:
850 case OCFS2_IOC_UNRESVSP:
851 case OCFS2_IOC_UNRESVSP64:
852 {
853 struct ocfs2_space_resv sr;
854
855 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
856 return -EFAULT;
857
858 return ocfs2_change_file_space(filp, cmd, &sr);
859 }
860 case OCFS2_IOC_GROUP_EXTEND:
861 {
862 int new_clusters;
863
864 if (!capable(CAP_SYS_RESOURCE))
865 return -EPERM;
866
867 if (get_user(new_clusters, (int __user *)arg))
868 return -EFAULT;
869
870 status = mnt_want_write_file(filp);
871 if (status)
872 return status;
873 status = ocfs2_group_extend(inode, new_clusters);
874 mnt_drop_write_file(filp);
875 return status;
876 }
877 case OCFS2_IOC_GROUP_ADD:
878 case OCFS2_IOC_GROUP_ADD64:
879 {
880 struct ocfs2_new_group_input input;
881
882 if (!capable(CAP_SYS_RESOURCE))
883 return -EPERM;
884
885 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
886 return -EFAULT;
887
888 status = mnt_want_write_file(filp);
889 if (status)
890 return status;
891 status = ocfs2_group_add(inode, &input);
892 mnt_drop_write_file(filp);
893 return status;
894 }
895 case OCFS2_IOC_REFLINK:
896 {
897 struct reflink_arguments args;
898 const char __user *old_path;
899 const char __user *new_path;
900 bool preserve;
901
902 if (copy_from_user(&args, argp, sizeof(args)))
903 return -EFAULT;
904 old_path = (const char __user *)(unsigned long)args.old_path;
905 new_path = (const char __user *)(unsigned long)args.new_path;
906 preserve = (args.preserve != 0);
907
908 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
909 }
910 case OCFS2_IOC_INFO:
911 {
912 struct ocfs2_info info;
913
914 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
915 return -EFAULT;
916
917 return ocfs2_info_handle(inode, &info, 0);
918 }
919 case FITRIM:
920 {
921 struct super_block *sb = inode->i_sb;
922 struct fstrim_range range;
923 int ret = 0;
924
925 if (!capable(CAP_SYS_ADMIN))
926 return -EPERM;
927
928 if (!bdev_max_discard_sectors(sb->s_bdev))
929 return -EOPNOTSUPP;
930
931 if (copy_from_user(&range, argp, sizeof(range)))
932 return -EFAULT;
933
934 range.minlen = max_t(u64, bdev_discard_granularity(sb->s_bdev),
935 range.minlen);
936 ret = ocfs2_trim_fs(sb, &range);
937 if (ret < 0)
938 return ret;
939
940 if (copy_to_user(argp, &range, sizeof(range)))
941 return -EFAULT;
942
943 return 0;
944 }
945 case OCFS2_IOC_MOVE_EXT:
946 return ocfs2_ioctl_move_extents(filp, argp);
947 default:
948 return -ENOTTY;
949 }
950 }
951
952 #ifdef CONFIG_COMPAT
953 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
954 {
955 bool preserve;
956 struct reflink_arguments args;
957 struct inode *inode = file_inode(file);
958 struct ocfs2_info info;
959 void __user *argp = (void __user *)arg;
960
961 switch (cmd) {
962 case OCFS2_IOC_RESVSP:
963 case OCFS2_IOC_RESVSP64:
964 case OCFS2_IOC_UNRESVSP:
965 case OCFS2_IOC_UNRESVSP64:
966 case OCFS2_IOC_GROUP_EXTEND:
967 case OCFS2_IOC_GROUP_ADD:
968 case OCFS2_IOC_GROUP_ADD64:
969 break;
970 case OCFS2_IOC_REFLINK:
971 if (copy_from_user(&args, argp, sizeof(args)))
972 return -EFAULT;
973 preserve = (args.preserve != 0);
974
975 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
976 compat_ptr(args.new_path), preserve);
977 case OCFS2_IOC_INFO:
978 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
979 return -EFAULT;
980
981 return ocfs2_info_handle(inode, &info, 1);
982 case FITRIM:
983 case OCFS2_IOC_MOVE_EXT:
984 break;
985 default:
986 return -ENOIOCTLCMD;
987 }
988
989 return ocfs2_ioctl(file, cmd, arg);
990 }
991 #endif
992
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