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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
14#include <cluster/masklog.h>
15
16#include "ocfs2.h"
17#include "alloc.h"
18#include "dlmglue.h"
19#include "file.h"
20#include "inode.h"
21#include "journal.h"
22
23#include "ocfs2_fs.h"
24#include "ioctl.h"
25#include "resize.h"
26#include "refcounttree.h"
27#include "sysfile.h"
28#include "dir.h"
29#include "buffer_head_io.h"
30#include "suballoc.h"
31#include "move_extents.h"
32
33#define o2info_from_user(a, b) \
34 copy_from_user(&(a), (b), sizeof(a))
35#define o2info_to_user(a, b) \
36 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
37
38/*
39 * This is just a best-effort to tell userspace that this request
40 * caused the error.
41 */
42static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
43 struct ocfs2_info_request __user *req)
44{
45 kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
46 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
47}
48
49static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
50{
51 req->ir_flags |= OCFS2_INFO_FL_FILLED;
52}
53
54static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
55{
56 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
57}
58
59static inline int o2info_coherent(struct ocfs2_info_request *req)
60{
61 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
62}
63
64static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
65{
66 int status;
67
68 status = ocfs2_inode_lock(inode, NULL, 0);
69 if (status < 0) {
70 mlog_errno(status);
71 return status;
72 }
73 ocfs2_get_inode_flags(OCFS2_I(inode));
74 *flags = OCFS2_I(inode)->ip_attr;
75 ocfs2_inode_unlock(inode, 0);
76
77 return status;
78}
79
80static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
81 unsigned mask)
82{
83 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
84 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
85 handle_t *handle = NULL;
86 struct buffer_head *bh = NULL;
87 unsigned oldflags;
88 int status;
89
90 inode_lock(inode);
91
92 status = ocfs2_inode_lock(inode, &bh, 1);
93 if (status < 0) {
94 mlog_errno(status);
95 goto bail;
96 }
97
98 status = -EACCES;
99 if (!inode_owner_or_capable(inode))
100 goto bail_unlock;
101
102 if (!S_ISDIR(inode->i_mode))
103 flags &= ~OCFS2_DIRSYNC_FL;
104
105 oldflags = ocfs2_inode->ip_attr;
106 flags = flags & mask;
107 flags |= oldflags & ~mask;
108
109 status = vfs_ioc_setflags_prepare(inode, oldflags, flags);
110 if (status)
111 goto bail_unlock;
112
113 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
114 if (IS_ERR(handle)) {
115 status = PTR_ERR(handle);
116 mlog_errno(status);
117 goto bail_unlock;
118 }
119
120 ocfs2_inode->ip_attr = flags;
121 ocfs2_set_inode_flags(inode);
122
123 status = ocfs2_mark_inode_dirty(handle, inode, bh);
124 if (status < 0)
125 mlog_errno(status);
126
127 ocfs2_commit_trans(osb, handle);
128
129bail_unlock:
130 ocfs2_inode_unlock(inode, 1);
131bail:
132 inode_unlock(inode);
133
134 brelse(bh);
135
136 return status;
137}
138
139static int ocfs2_info_handle_blocksize(struct inode *inode,
140 struct ocfs2_info_request __user *req)
141{
142 struct ocfs2_info_blocksize oib;
143
144 if (o2info_from_user(oib, req))
145 return -EFAULT;
146
147 oib.ib_blocksize = inode->i_sb->s_blocksize;
148
149 o2info_set_request_filled(&oib.ib_req);
150
151 if (o2info_to_user(oib, req))
152 return -EFAULT;
153
154 return 0;
155}
156
157static int ocfs2_info_handle_clustersize(struct inode *inode,
158 struct ocfs2_info_request __user *req)
159{
160 struct ocfs2_info_clustersize oic;
161 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
162
163 if (o2info_from_user(oic, req))
164 return -EFAULT;
165
166 oic.ic_clustersize = osb->s_clustersize;
167
168 o2info_set_request_filled(&oic.ic_req);
169
170 if (o2info_to_user(oic, req))
171 return -EFAULT;
172
173 return 0;
174}
175
176static int ocfs2_info_handle_maxslots(struct inode *inode,
177 struct ocfs2_info_request __user *req)
178{
179 struct ocfs2_info_maxslots oim;
180 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
181
182 if (o2info_from_user(oim, req))
183 return -EFAULT;
184
185 oim.im_max_slots = osb->max_slots;
186
187 o2info_set_request_filled(&oim.im_req);
188
189 if (o2info_to_user(oim, req))
190 return -EFAULT;
191
192 return 0;
193}
194
195static int ocfs2_info_handle_label(struct inode *inode,
196 struct ocfs2_info_request __user *req)
197{
198 struct ocfs2_info_label oil;
199 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
200
201 if (o2info_from_user(oil, req))
202 return -EFAULT;
203
204 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
205
206 o2info_set_request_filled(&oil.il_req);
207
208 if (o2info_to_user(oil, req))
209 return -EFAULT;
210
211 return 0;
212}
213
214static int ocfs2_info_handle_uuid(struct inode *inode,
215 struct ocfs2_info_request __user *req)
216{
217 struct ocfs2_info_uuid oiu;
218 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
219
220 if (o2info_from_user(oiu, req))
221 return -EFAULT;
222
223 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
224
225 o2info_set_request_filled(&oiu.iu_req);
226
227 if (o2info_to_user(oiu, req))
228 return -EFAULT;
229
230 return 0;
231}
232
233static int ocfs2_info_handle_fs_features(struct inode *inode,
234 struct ocfs2_info_request __user *req)
235{
236 struct ocfs2_info_fs_features oif;
237 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
238
239 if (o2info_from_user(oif, req))
240 return -EFAULT;
241
242 oif.if_compat_features = osb->s_feature_compat;
243 oif.if_incompat_features = osb->s_feature_incompat;
244 oif.if_ro_compat_features = osb->s_feature_ro_compat;
245
246 o2info_set_request_filled(&oif.if_req);
247
248 if (o2info_to_user(oif, req))
249 return -EFAULT;
250
251 return 0;
252}
253
254static int ocfs2_info_handle_journal_size(struct inode *inode,
255 struct ocfs2_info_request __user *req)
256{
257 struct ocfs2_info_journal_size oij;
258 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
259
260 if (o2info_from_user(oij, req))
261 return -EFAULT;
262
263 oij.ij_journal_size = i_size_read(osb->journal->j_inode);
264
265 o2info_set_request_filled(&oij.ij_req);
266
267 if (o2info_to_user(oij, req))
268 return -EFAULT;
269
270 return 0;
271}
272
273static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
274 struct inode *inode_alloc, u64 blkno,
275 struct ocfs2_info_freeinode *fi,
276 u32 slot)
277{
278 int status = 0, unlock = 0;
279
280 struct buffer_head *bh = NULL;
281 struct ocfs2_dinode *dinode_alloc = NULL;
282
283 if (inode_alloc)
284 inode_lock(inode_alloc);
285
286 if (inode_alloc && o2info_coherent(&fi->ifi_req)) {
287 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
288 if (status < 0) {
289 mlog_errno(status);
290 goto bail;
291 }
292 unlock = 1;
293 } else {
294 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
295 if (status < 0) {
296 mlog_errno(status);
297 goto bail;
298 }
299 }
300
301 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
302
303 fi->ifi_stat[slot].lfi_total =
304 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
305 fi->ifi_stat[slot].lfi_free =
306 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
307 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
308
309bail:
310 if (unlock)
311 ocfs2_inode_unlock(inode_alloc, 0);
312
313 if (inode_alloc)
314 inode_unlock(inode_alloc);
315
316 brelse(bh);
317
318 return status;
319}
320
321static int ocfs2_info_handle_freeinode(struct inode *inode,
322 struct ocfs2_info_request __user *req)
323{
324 u32 i;
325 u64 blkno = -1;
326 char namebuf[40];
327 int status, type = INODE_ALLOC_SYSTEM_INODE;
328 struct ocfs2_info_freeinode *oifi = NULL;
329 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
330 struct inode *inode_alloc = NULL;
331
332 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
333 if (!oifi) {
334 status = -ENOMEM;
335 mlog_errno(status);
336 goto out_err;
337 }
338
339 if (o2info_from_user(*oifi, req)) {
340 status = -EFAULT;
341 goto out_free;
342 }
343
344 oifi->ifi_slotnum = osb->max_slots;
345
346 for (i = 0; i < oifi->ifi_slotnum; i++) {
347 if (o2info_coherent(&oifi->ifi_req)) {
348 inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
349 if (!inode_alloc) {
350 mlog(ML_ERROR, "unable to get alloc inode in "
351 "slot %u\n", i);
352 status = -EIO;
353 goto bail;
354 }
355 } else {
356 ocfs2_sprintf_system_inode_name(namebuf,
357 sizeof(namebuf),
358 type, i);
359 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
360 namebuf,
361 strlen(namebuf),
362 &blkno);
363 if (status < 0) {
364 status = -ENOENT;
365 goto bail;
366 }
367 }
368
369 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
370
371 iput(inode_alloc);
372 inode_alloc = NULL;
373
374 if (status < 0)
375 goto bail;
376 }
377
378 o2info_set_request_filled(&oifi->ifi_req);
379
380 if (o2info_to_user(*oifi, req)) {
381 status = -EFAULT;
382 goto out_free;
383 }
384
385 status = 0;
386bail:
387 if (status)
388 o2info_set_request_error(&oifi->ifi_req, req);
389out_free:
390 kfree(oifi);
391out_err:
392 return status;
393}
394
395static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
396 unsigned int chunksize)
397{
398 u32 index;
399
400 index = __ilog2_u32(chunksize);
401 if (index >= OCFS2_INFO_MAX_HIST)
402 index = OCFS2_INFO_MAX_HIST - 1;
403
404 hist->fc_chunks[index]++;
405 hist->fc_clusters[index] += chunksize;
406}
407
408static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
409 unsigned int chunksize)
410{
411 if (chunksize > stats->ffs_max)
412 stats->ffs_max = chunksize;
413
414 if (chunksize < stats->ffs_min)
415 stats->ffs_min = chunksize;
416
417 stats->ffs_avg += chunksize;
418 stats->ffs_free_chunks_real++;
419}
420
421static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
422 unsigned int chunksize)
423{
424 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
425 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
426}
427
428static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
429 struct inode *gb_inode,
430 struct ocfs2_dinode *gb_dinode,
431 struct ocfs2_chain_rec *rec,
432 struct ocfs2_info_freefrag *ffg,
433 u32 chunks_in_group)
434{
435 int status = 0, used;
436 u64 blkno;
437
438 struct buffer_head *bh = NULL;
439 struct ocfs2_group_desc *bg = NULL;
440
441 unsigned int max_bits, num_clusters;
442 unsigned int offset = 0, cluster, chunk;
443 unsigned int chunk_free, last_chunksize = 0;
444
445 if (!le32_to_cpu(rec->c_free))
446 goto bail;
447
448 do {
449 if (!bg)
450 blkno = le64_to_cpu(rec->c_blkno);
451 else
452 blkno = le64_to_cpu(bg->bg_next_group);
453
454 if (bh) {
455 brelse(bh);
456 bh = NULL;
457 }
458
459 if (o2info_coherent(&ffg->iff_req))
460 status = ocfs2_read_group_descriptor(gb_inode,
461 gb_dinode,
462 blkno, &bh);
463 else
464 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
465
466 if (status < 0) {
467 mlog(ML_ERROR, "Can't read the group descriptor # "
468 "%llu from device.", (unsigned long long)blkno);
469 status = -EIO;
470 goto bail;
471 }
472
473 bg = (struct ocfs2_group_desc *)bh->b_data;
474
475 if (!le16_to_cpu(bg->bg_free_bits_count))
476 continue;
477
478 max_bits = le16_to_cpu(bg->bg_bits);
479 offset = 0;
480
481 for (chunk = 0; chunk < chunks_in_group; chunk++) {
482 /*
483 * last chunk may be not an entire one.
484 */
485 if ((offset + ffg->iff_chunksize) > max_bits)
486 num_clusters = max_bits - offset;
487 else
488 num_clusters = ffg->iff_chunksize;
489
490 chunk_free = 0;
491 for (cluster = 0; cluster < num_clusters; cluster++) {
492 used = ocfs2_test_bit(offset,
493 (unsigned long *)bg->bg_bitmap);
494 /*
495 * - chunk_free counts free clusters in #N chunk.
496 * - last_chunksize records the size(in) clusters
497 * for the last real free chunk being counted.
498 */
499 if (!used) {
500 last_chunksize++;
501 chunk_free++;
502 }
503
504 if (used && last_chunksize) {
505 ocfs2_info_update_ffg(ffg,
506 last_chunksize);
507 last_chunksize = 0;
508 }
509
510 offset++;
511 }
512
513 if (chunk_free == ffg->iff_chunksize)
514 ffg->iff_ffs.ffs_free_chunks++;
515 }
516
517 /*
518 * need to update the info for last free chunk.
519 */
520 if (last_chunksize)
521 ocfs2_info_update_ffg(ffg, last_chunksize);
522
523 } while (le64_to_cpu(bg->bg_next_group));
524
525bail:
526 brelse(bh);
527
528 return status;
529}
530
531static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
532 struct inode *gb_inode, u64 blkno,
533 struct ocfs2_info_freefrag *ffg)
534{
535 u32 chunks_in_group;
536 int status = 0, unlock = 0, i;
537
538 struct buffer_head *bh = NULL;
539 struct ocfs2_chain_list *cl = NULL;
540 struct ocfs2_chain_rec *rec = NULL;
541 struct ocfs2_dinode *gb_dinode = NULL;
542
543 if (gb_inode)
544 inode_lock(gb_inode);
545
546 if (o2info_coherent(&ffg->iff_req)) {
547 status = ocfs2_inode_lock(gb_inode, &bh, 0);
548 if (status < 0) {
549 mlog_errno(status);
550 goto bail;
551 }
552 unlock = 1;
553 } else {
554 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
555 if (status < 0) {
556 mlog_errno(status);
557 goto bail;
558 }
559 }
560
561 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
562 cl = &(gb_dinode->id2.i_chain);
563
564 /*
565 * Chunksize(in) clusters from userspace should be
566 * less than clusters in a group.
567 */
568 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
569 status = -EINVAL;
570 goto bail;
571 }
572
573 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
574
575 ffg->iff_ffs.ffs_min = ~0U;
576 ffg->iff_ffs.ffs_clusters =
577 le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
578 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
579 le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
580
581 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
582
583 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
584 rec = &(cl->cl_recs[i]);
585 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
586 gb_dinode,
587 rec, ffg,
588 chunks_in_group);
589 if (status)
590 goto bail;
591 }
592
593 if (ffg->iff_ffs.ffs_free_chunks_real)
594 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
595 ffg->iff_ffs.ffs_free_chunks_real);
596bail:
597 if (unlock)
598 ocfs2_inode_unlock(gb_inode, 0);
599
600 if (gb_inode)
601 inode_unlock(gb_inode);
602
603 iput(gb_inode);
604 brelse(bh);
605
606 return status;
607}
608
609static int ocfs2_info_handle_freefrag(struct inode *inode,
610 struct ocfs2_info_request __user *req)
611{
612 u64 blkno = -1;
613 char namebuf[40];
614 int status, type = GLOBAL_BITMAP_SYSTEM_INODE;
615
616 struct ocfs2_info_freefrag *oiff;
617 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
618 struct inode *gb_inode = NULL;
619
620 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
621 if (!oiff) {
622 status = -ENOMEM;
623 mlog_errno(status);
624 goto out_err;
625 }
626
627 if (o2info_from_user(*oiff, req)) {
628 status = -EFAULT;
629 goto out_free;
630 }
631 /*
632 * chunksize from userspace should be power of 2.
633 */
634 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
635 (!oiff->iff_chunksize)) {
636 status = -EINVAL;
637 goto bail;
638 }
639
640 if (o2info_coherent(&oiff->iff_req)) {
641 gb_inode = ocfs2_get_system_file_inode(osb, type,
642 OCFS2_INVALID_SLOT);
643 if (!gb_inode) {
644 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
645 status = -EIO;
646 goto bail;
647 }
648 } else {
649 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
650 OCFS2_INVALID_SLOT);
651 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
652 namebuf,
653 strlen(namebuf),
654 &blkno);
655 if (status < 0) {
656 status = -ENOENT;
657 goto bail;
658 }
659 }
660
661 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
662 if (status < 0)
663 goto bail;
664
665 o2info_set_request_filled(&oiff->iff_req);
666
667 if (o2info_to_user(*oiff, req)) {
668 status = -EFAULT;
669 goto out_free;
670 }
671
672 status = 0;
673bail:
674 if (status)
675 o2info_set_request_error(&oiff->iff_req, req);
676out_free:
677 kfree(oiff);
678out_err:
679 return status;
680}
681
682static int ocfs2_info_handle_unknown(struct inode *inode,
683 struct ocfs2_info_request __user *req)
684{
685 struct ocfs2_info_request oir;
686
687 if (o2info_from_user(oir, req))
688 return -EFAULT;
689
690 o2info_clear_request_filled(&oir);
691
692 if (o2info_to_user(oir, req))
693 return -EFAULT;
694
695 return 0;
696}
697
698/*
699 * Validate and distinguish OCFS2_IOC_INFO requests.
700 *
701 * - validate the magic number.
702 * - distinguish different requests.
703 * - validate size of different requests.
704 */
705static int ocfs2_info_handle_request(struct inode *inode,
706 struct ocfs2_info_request __user *req)
707{
708 int status = -EFAULT;
709 struct ocfs2_info_request oir;
710
711 if (o2info_from_user(oir, req))
712 goto bail;
713
714 status = -EINVAL;
715 if (oir.ir_magic != OCFS2_INFO_MAGIC)
716 goto bail;
717
718 switch (oir.ir_code) {
719 case OCFS2_INFO_BLOCKSIZE:
720 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
721 status = ocfs2_info_handle_blocksize(inode, req);
722 break;
723 case OCFS2_INFO_CLUSTERSIZE:
724 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
725 status = ocfs2_info_handle_clustersize(inode, req);
726 break;
727 case OCFS2_INFO_MAXSLOTS:
728 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
729 status = ocfs2_info_handle_maxslots(inode, req);
730 break;
731 case OCFS2_INFO_LABEL:
732 if (oir.ir_size == sizeof(struct ocfs2_info_label))
733 status = ocfs2_info_handle_label(inode, req);
734 break;
735 case OCFS2_INFO_UUID:
736 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
737 status = ocfs2_info_handle_uuid(inode, req);
738 break;
739 case OCFS2_INFO_FS_FEATURES:
740 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
741 status = ocfs2_info_handle_fs_features(inode, req);
742 break;
743 case OCFS2_INFO_JOURNAL_SIZE:
744 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
745 status = ocfs2_info_handle_journal_size(inode, req);
746 break;
747 case OCFS2_INFO_FREEINODE:
748 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
749 status = ocfs2_info_handle_freeinode(inode, req);
750 break;
751 case OCFS2_INFO_FREEFRAG:
752 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
753 status = ocfs2_info_handle_freefrag(inode, req);
754 break;
755 default:
756 status = ocfs2_info_handle_unknown(inode, req);
757 break;
758 }
759
760bail:
761 return status;
762}
763
764static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
765 u64 *req_addr, int compat_flag)
766{
767 int status = -EFAULT;
768 u64 __user *bp = NULL;
769
770 if (compat_flag) {
771#ifdef CONFIG_COMPAT
772 /*
773 * pointer bp stores the base address of a pointers array,
774 * which collects all addresses of separate request.
775 */
776 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
777#else
778 BUG();
779#endif
780 } else
781 bp = (u64 __user *)(unsigned long)(info->oi_requests);
782
783 if (o2info_from_user(*req_addr, bp + idx))
784 goto bail;
785
786 status = 0;
787bail:
788 return status;
789}
790
791/*
792 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
793 *
794 * ocfs2_info_handle() recevies a large info aggregation, grab and
795 * validate the request count from header, then break it into small
796 * pieces, later specific handlers can handle them one by one.
797 *
798 * Idea here is to make each separate request small enough to ensure
799 * a better backward&forward compatibility, since a small piece of
800 * request will be less likely to be broken if disk layout get changed.
801 */
802static int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
803 int compat_flag)
804{
805 int i, status = 0;
806 u64 req_addr;
807 struct ocfs2_info_request __user *reqp;
808
809 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
810 (!info->oi_requests)) {
811 status = -EINVAL;
812 goto bail;
813 }
814
815 for (i = 0; i < info->oi_count; i++) {
816
817 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
818 if (status)
819 break;
820
821 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
822 if (!reqp) {
823 status = -EINVAL;
824 goto bail;
825 }
826
827 status = ocfs2_info_handle_request(inode, reqp);
828 if (status)
829 break;
830 }
831
832bail:
833 return status;
834}
835
836long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
837{
838 struct inode *inode = file_inode(filp);
839 unsigned int flags;
840 int new_clusters;
841 int status;
842 struct ocfs2_space_resv sr;
843 struct ocfs2_new_group_input input;
844 struct reflink_arguments args;
845 const char __user *old_path;
846 const char __user *new_path;
847 bool preserve;
848 struct ocfs2_info info;
849 void __user *argp = (void __user *)arg;
850
851 switch (cmd) {
852 case OCFS2_IOC_GETFLAGS:
853 status = ocfs2_get_inode_attr(inode, &flags);
854 if (status < 0)
855 return status;
856
857 flags &= OCFS2_FL_VISIBLE;
858 return put_user(flags, (int __user *) arg);
859 case OCFS2_IOC_SETFLAGS:
860 if (get_user(flags, (int __user *) arg))
861 return -EFAULT;
862
863 status = mnt_want_write_file(filp);
864 if (status)
865 return status;
866 status = ocfs2_set_inode_attr(inode, flags,
867 OCFS2_FL_MODIFIABLE);
868 mnt_drop_write_file(filp);
869 return status;
870 case OCFS2_IOC_RESVSP:
871 case OCFS2_IOC_RESVSP64:
872 case OCFS2_IOC_UNRESVSP:
873 case OCFS2_IOC_UNRESVSP64:
874 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
875 return -EFAULT;
876
877 return ocfs2_change_file_space(filp, cmd, &sr);
878 case OCFS2_IOC_GROUP_EXTEND:
879 if (!capable(CAP_SYS_RESOURCE))
880 return -EPERM;
881
882 if (get_user(new_clusters, (int __user *)arg))
883 return -EFAULT;
884
885 status = mnt_want_write_file(filp);
886 if (status)
887 return status;
888 status = ocfs2_group_extend(inode, new_clusters);
889 mnt_drop_write_file(filp);
890 return status;
891 case OCFS2_IOC_GROUP_ADD:
892 case OCFS2_IOC_GROUP_ADD64:
893 if (!capable(CAP_SYS_RESOURCE))
894 return -EPERM;
895
896 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
897 return -EFAULT;
898
899 status = mnt_want_write_file(filp);
900 if (status)
901 return status;
902 status = ocfs2_group_add(inode, &input);
903 mnt_drop_write_file(filp);
904 return status;
905 case OCFS2_IOC_REFLINK:
906 if (copy_from_user(&args, argp, sizeof(args)))
907 return -EFAULT;
908 old_path = (const char __user *)(unsigned long)args.old_path;
909 new_path = (const char __user *)(unsigned long)args.new_path;
910 preserve = (args.preserve != 0);
911
912 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
913 case OCFS2_IOC_INFO:
914 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
915 return -EFAULT;
916
917 return ocfs2_info_handle(inode, &info, 0);
918 case FITRIM:
919 {
920 struct super_block *sb = inode->i_sb;
921 struct request_queue *q = bdev_get_queue(sb->s_bdev);
922 struct fstrim_range range;
923 int ret = 0;
924
925 if (!capable(CAP_SYS_ADMIN))
926 return -EPERM;
927
928 if (!blk_queue_discard(q))
929 return -EOPNOTSUPP;
930
931 if (copy_from_user(&range, argp, sizeof(range)))
932 return -EFAULT;
933
934 range.minlen = max_t(u64, q->limits.discard_granularity,
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
953long 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_IOC32_GETFLAGS:
963 cmd = OCFS2_IOC_GETFLAGS;
964 break;
965 case OCFS2_IOC32_SETFLAGS:
966 cmd = OCFS2_IOC_SETFLAGS;
967 break;
968 case OCFS2_IOC_RESVSP:
969 case OCFS2_IOC_RESVSP64:
970 case OCFS2_IOC_UNRESVSP:
971 case OCFS2_IOC_UNRESVSP64:
972 case OCFS2_IOC_GROUP_EXTEND:
973 case OCFS2_IOC_GROUP_ADD:
974 case OCFS2_IOC_GROUP_ADD64:
975 break;
976 case OCFS2_IOC_REFLINK:
977 if (copy_from_user(&args, argp, sizeof(args)))
978 return -EFAULT;
979 preserve = (args.preserve != 0);
980
981 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
982 compat_ptr(args.new_path), preserve);
983 case OCFS2_IOC_INFO:
984 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
985 return -EFAULT;
986
987 return ocfs2_info_handle(inode, &info, 1);
988 case FITRIM:
989 case OCFS2_IOC_MOVE_EXT:
990 break;
991 default:
992 return -ENOIOCTLCMD;
993 }
994
995 return ocfs2_ioctl(file, cmd, arg);
996}
997#endif
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
14#include <cluster/masklog.h>
15
16#include "ocfs2.h"
17#include "alloc.h"
18#include "dlmglue.h"
19#include "file.h"
20#include "inode.h"
21#include "journal.h"
22
23#include "ocfs2_fs.h"
24#include "ioctl.h"
25#include "resize.h"
26#include "refcounttree.h"
27#include "sysfile.h"
28#include "dir.h"
29#include "buffer_head_io.h"
30#include "suballoc.h"
31#include "move_extents.h"
32
33#define o2info_from_user(a, b) \
34 copy_from_user(&(a), (b), sizeof(a))
35#define o2info_to_user(a, b) \
36 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
37
38/*
39 * This is just a best-effort to tell userspace that this request
40 * caused the error.
41 */
42static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
43 struct ocfs2_info_request __user *req)
44{
45 kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
46 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
47}
48
49static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
50{
51 req->ir_flags |= OCFS2_INFO_FL_FILLED;
52}
53
54static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
55{
56 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
57}
58
59static inline int o2info_coherent(struct ocfs2_info_request *req)
60{
61 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
62}
63
64static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
65{
66 int status;
67
68 status = ocfs2_inode_lock(inode, NULL, 0);
69 if (status < 0) {
70 mlog_errno(status);
71 return status;
72 }
73 ocfs2_get_inode_flags(OCFS2_I(inode));
74 *flags = OCFS2_I(inode)->ip_attr;
75 ocfs2_inode_unlock(inode, 0);
76
77 return status;
78}
79
80static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
81 unsigned mask)
82{
83 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
84 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
85 handle_t *handle = NULL;
86 struct buffer_head *bh = NULL;
87 unsigned oldflags;
88 int status;
89
90 inode_lock(inode);
91
92 status = ocfs2_inode_lock(inode, &bh, 1);
93 if (status < 0) {
94 mlog_errno(status);
95 goto bail;
96 }
97
98 status = -EACCES;
99 if (!inode_owner_or_capable(inode))
100 goto bail_unlock;
101
102 if (!S_ISDIR(inode->i_mode))
103 flags &= ~OCFS2_DIRSYNC_FL;
104
105 oldflags = ocfs2_inode->ip_attr;
106 flags = flags & mask;
107 flags |= oldflags & ~mask;
108
109 /*
110 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
111 * the relevant capability.
112 */
113 status = -EPERM;
114 if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
115 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
116 if (!capable(CAP_LINUX_IMMUTABLE))
117 goto bail_unlock;
118 }
119
120 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
121 if (IS_ERR(handle)) {
122 status = PTR_ERR(handle);
123 mlog_errno(status);
124 goto bail_unlock;
125 }
126
127 ocfs2_inode->ip_attr = flags;
128 ocfs2_set_inode_flags(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
136bail_unlock:
137 ocfs2_inode_unlock(inode, 1);
138bail:
139 inode_unlock(inode);
140
141 brelse(bh);
142
143 return status;
144}
145
146static int ocfs2_info_handle_blocksize(struct inode *inode,
147 struct ocfs2_info_request __user *req)
148{
149 struct ocfs2_info_blocksize oib;
150
151 if (o2info_from_user(oib, req))
152 return -EFAULT;
153
154 oib.ib_blocksize = inode->i_sb->s_blocksize;
155
156 o2info_set_request_filled(&oib.ib_req);
157
158 if (o2info_to_user(oib, req))
159 return -EFAULT;
160
161 return 0;
162}
163
164static int ocfs2_info_handle_clustersize(struct inode *inode,
165 struct ocfs2_info_request __user *req)
166{
167 struct ocfs2_info_clustersize oic;
168 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
169
170 if (o2info_from_user(oic, req))
171 return -EFAULT;
172
173 oic.ic_clustersize = osb->s_clustersize;
174
175 o2info_set_request_filled(&oic.ic_req);
176
177 if (o2info_to_user(oic, req))
178 return -EFAULT;
179
180 return 0;
181}
182
183static int ocfs2_info_handle_maxslots(struct inode *inode,
184 struct ocfs2_info_request __user *req)
185{
186 struct ocfs2_info_maxslots oim;
187 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
188
189 if (o2info_from_user(oim, req))
190 return -EFAULT;
191
192 oim.im_max_slots = osb->max_slots;
193
194 o2info_set_request_filled(&oim.im_req);
195
196 if (o2info_to_user(oim, req))
197 return -EFAULT;
198
199 return 0;
200}
201
202static int ocfs2_info_handle_label(struct inode *inode,
203 struct ocfs2_info_request __user *req)
204{
205 struct ocfs2_info_label oil;
206 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
207
208 if (o2info_from_user(oil, req))
209 return -EFAULT;
210
211 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
212
213 o2info_set_request_filled(&oil.il_req);
214
215 if (o2info_to_user(oil, req))
216 return -EFAULT;
217
218 return 0;
219}
220
221static int ocfs2_info_handle_uuid(struct inode *inode,
222 struct ocfs2_info_request __user *req)
223{
224 struct ocfs2_info_uuid oiu;
225 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
226
227 if (o2info_from_user(oiu, req))
228 return -EFAULT;
229
230 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
231
232 o2info_set_request_filled(&oiu.iu_req);
233
234 if (o2info_to_user(oiu, req))
235 return -EFAULT;
236
237 return 0;
238}
239
240static int ocfs2_info_handle_fs_features(struct inode *inode,
241 struct ocfs2_info_request __user *req)
242{
243 struct ocfs2_info_fs_features oif;
244 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
245
246 if (o2info_from_user(oif, req))
247 return -EFAULT;
248
249 oif.if_compat_features = osb->s_feature_compat;
250 oif.if_incompat_features = osb->s_feature_incompat;
251 oif.if_ro_compat_features = osb->s_feature_ro_compat;
252
253 o2info_set_request_filled(&oif.if_req);
254
255 if (o2info_to_user(oif, req))
256 return -EFAULT;
257
258 return 0;
259}
260
261static int ocfs2_info_handle_journal_size(struct inode *inode,
262 struct ocfs2_info_request __user *req)
263{
264 struct ocfs2_info_journal_size oij;
265 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
266
267 if (o2info_from_user(oij, req))
268 return -EFAULT;
269
270 oij.ij_journal_size = i_size_read(osb->journal->j_inode);
271
272 o2info_set_request_filled(&oij.ij_req);
273
274 if (o2info_to_user(oij, req))
275 return -EFAULT;
276
277 return 0;
278}
279
280static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
281 struct inode *inode_alloc, u64 blkno,
282 struct ocfs2_info_freeinode *fi,
283 u32 slot)
284{
285 int status = 0, unlock = 0;
286
287 struct buffer_head *bh = NULL;
288 struct ocfs2_dinode *dinode_alloc = NULL;
289
290 if (inode_alloc)
291 inode_lock(inode_alloc);
292
293 if (o2info_coherent(&fi->ifi_req)) {
294 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
295 if (status < 0) {
296 mlog_errno(status);
297 goto bail;
298 }
299 unlock = 1;
300 } else {
301 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
302 if (status < 0) {
303 mlog_errno(status);
304 goto bail;
305 }
306 }
307
308 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
309
310 fi->ifi_stat[slot].lfi_total =
311 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
312 fi->ifi_stat[slot].lfi_free =
313 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
314 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
315
316bail:
317 if (unlock)
318 ocfs2_inode_unlock(inode_alloc, 0);
319
320 if (inode_alloc)
321 inode_unlock(inode_alloc);
322
323 brelse(bh);
324
325 return status;
326}
327
328static int ocfs2_info_handle_freeinode(struct inode *inode,
329 struct ocfs2_info_request __user *req)
330{
331 u32 i;
332 u64 blkno = -1;
333 char namebuf[40];
334 int status, type = INODE_ALLOC_SYSTEM_INODE;
335 struct ocfs2_info_freeinode *oifi = NULL;
336 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
337 struct inode *inode_alloc = NULL;
338
339 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
340 if (!oifi) {
341 status = -ENOMEM;
342 mlog_errno(status);
343 goto out_err;
344 }
345
346 if (o2info_from_user(*oifi, req)) {
347 status = -EFAULT;
348 goto out_free;
349 }
350
351 oifi->ifi_slotnum = osb->max_slots;
352
353 for (i = 0; i < oifi->ifi_slotnum; i++) {
354 if (o2info_coherent(&oifi->ifi_req)) {
355 inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
356 if (!inode_alloc) {
357 mlog(ML_ERROR, "unable to get alloc inode in "
358 "slot %u\n", i);
359 status = -EIO;
360 goto bail;
361 }
362 } else {
363 ocfs2_sprintf_system_inode_name(namebuf,
364 sizeof(namebuf),
365 type, i);
366 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
367 namebuf,
368 strlen(namebuf),
369 &blkno);
370 if (status < 0) {
371 status = -ENOENT;
372 goto bail;
373 }
374 }
375
376 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
377
378 iput(inode_alloc);
379 inode_alloc = NULL;
380
381 if (status < 0)
382 goto bail;
383 }
384
385 o2info_set_request_filled(&oifi->ifi_req);
386
387 if (o2info_to_user(*oifi, req)) {
388 status = -EFAULT;
389 goto out_free;
390 }
391
392 status = 0;
393bail:
394 if (status)
395 o2info_set_request_error(&oifi->ifi_req, req);
396out_free:
397 kfree(oifi);
398out_err:
399 return status;
400}
401
402static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
403 unsigned int chunksize)
404{
405 int index;
406
407 index = __ilog2_u32(chunksize);
408 if (index >= OCFS2_INFO_MAX_HIST)
409 index = OCFS2_INFO_MAX_HIST - 1;
410
411 hist->fc_chunks[index]++;
412 hist->fc_clusters[index] += chunksize;
413}
414
415static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
416 unsigned int chunksize)
417{
418 if (chunksize > stats->ffs_max)
419 stats->ffs_max = chunksize;
420
421 if (chunksize < stats->ffs_min)
422 stats->ffs_min = chunksize;
423
424 stats->ffs_avg += chunksize;
425 stats->ffs_free_chunks_real++;
426}
427
428static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
429 unsigned int chunksize)
430{
431 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
432 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
433}
434
435static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
436 struct inode *gb_inode,
437 struct ocfs2_dinode *gb_dinode,
438 struct ocfs2_chain_rec *rec,
439 struct ocfs2_info_freefrag *ffg,
440 u32 chunks_in_group)
441{
442 int status = 0, used;
443 u64 blkno;
444
445 struct buffer_head *bh = NULL;
446 struct ocfs2_group_desc *bg = NULL;
447
448 unsigned int max_bits, num_clusters;
449 unsigned int offset = 0, cluster, chunk;
450 unsigned int chunk_free, last_chunksize = 0;
451
452 if (!le32_to_cpu(rec->c_free))
453 goto bail;
454
455 do {
456 if (!bg)
457 blkno = le64_to_cpu(rec->c_blkno);
458 else
459 blkno = le64_to_cpu(bg->bg_next_group);
460
461 if (bh) {
462 brelse(bh);
463 bh = NULL;
464 }
465
466 if (o2info_coherent(&ffg->iff_req))
467 status = ocfs2_read_group_descriptor(gb_inode,
468 gb_dinode,
469 blkno, &bh);
470 else
471 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
472
473 if (status < 0) {
474 mlog(ML_ERROR, "Can't read the group descriptor # "
475 "%llu from device.", (unsigned long long)blkno);
476 status = -EIO;
477 goto bail;
478 }
479
480 bg = (struct ocfs2_group_desc *)bh->b_data;
481
482 if (!le16_to_cpu(bg->bg_free_bits_count))
483 continue;
484
485 max_bits = le16_to_cpu(bg->bg_bits);
486 offset = 0;
487
488 for (chunk = 0; chunk < chunks_in_group; chunk++) {
489 /*
490 * last chunk may be not an entire one.
491 */
492 if ((offset + ffg->iff_chunksize) > max_bits)
493 num_clusters = max_bits - offset;
494 else
495 num_clusters = ffg->iff_chunksize;
496
497 chunk_free = 0;
498 for (cluster = 0; cluster < num_clusters; cluster++) {
499 used = ocfs2_test_bit(offset,
500 (unsigned long *)bg->bg_bitmap);
501 /*
502 * - chunk_free counts free clusters in #N chunk.
503 * - last_chunksize records the size(in) clusters
504 * for the last real free chunk being counted.
505 */
506 if (!used) {
507 last_chunksize++;
508 chunk_free++;
509 }
510
511 if (used && last_chunksize) {
512 ocfs2_info_update_ffg(ffg,
513 last_chunksize);
514 last_chunksize = 0;
515 }
516
517 offset++;
518 }
519
520 if (chunk_free == ffg->iff_chunksize)
521 ffg->iff_ffs.ffs_free_chunks++;
522 }
523
524 /*
525 * need to update the info for last free chunk.
526 */
527 if (last_chunksize)
528 ocfs2_info_update_ffg(ffg, last_chunksize);
529
530 } while (le64_to_cpu(bg->bg_next_group));
531
532bail:
533 brelse(bh);
534
535 return status;
536}
537
538static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
539 struct inode *gb_inode, u64 blkno,
540 struct ocfs2_info_freefrag *ffg)
541{
542 u32 chunks_in_group;
543 int status = 0, unlock = 0, i;
544
545 struct buffer_head *bh = NULL;
546 struct ocfs2_chain_list *cl = NULL;
547 struct ocfs2_chain_rec *rec = NULL;
548 struct ocfs2_dinode *gb_dinode = NULL;
549
550 if (gb_inode)
551 inode_lock(gb_inode);
552
553 if (o2info_coherent(&ffg->iff_req)) {
554 status = ocfs2_inode_lock(gb_inode, &bh, 0);
555 if (status < 0) {
556 mlog_errno(status);
557 goto bail;
558 }
559 unlock = 1;
560 } else {
561 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
562 if (status < 0) {
563 mlog_errno(status);
564 goto bail;
565 }
566 }
567
568 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
569 cl = &(gb_dinode->id2.i_chain);
570
571 /*
572 * Chunksize(in) clusters from userspace should be
573 * less than clusters in a group.
574 */
575 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
576 status = -EINVAL;
577 goto bail;
578 }
579
580 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
581
582 ffg->iff_ffs.ffs_min = ~0U;
583 ffg->iff_ffs.ffs_clusters =
584 le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
585 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
586 le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
587
588 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
589
590 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
591 rec = &(cl->cl_recs[i]);
592 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
593 gb_dinode,
594 rec, ffg,
595 chunks_in_group);
596 if (status)
597 goto bail;
598 }
599
600 if (ffg->iff_ffs.ffs_free_chunks_real)
601 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
602 ffg->iff_ffs.ffs_free_chunks_real);
603bail:
604 if (unlock)
605 ocfs2_inode_unlock(gb_inode, 0);
606
607 if (gb_inode)
608 inode_unlock(gb_inode);
609
610 iput(gb_inode);
611 brelse(bh);
612
613 return status;
614}
615
616static int ocfs2_info_handle_freefrag(struct inode *inode,
617 struct ocfs2_info_request __user *req)
618{
619 u64 blkno = -1;
620 char namebuf[40];
621 int status, type = GLOBAL_BITMAP_SYSTEM_INODE;
622
623 struct ocfs2_info_freefrag *oiff;
624 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
625 struct inode *gb_inode = NULL;
626
627 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
628 if (!oiff) {
629 status = -ENOMEM;
630 mlog_errno(status);
631 goto out_err;
632 }
633
634 if (o2info_from_user(*oiff, req)) {
635 status = -EFAULT;
636 goto out_free;
637 }
638 /*
639 * chunksize from userspace should be power of 2.
640 */
641 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
642 (!oiff->iff_chunksize)) {
643 status = -EINVAL;
644 goto bail;
645 }
646
647 if (o2info_coherent(&oiff->iff_req)) {
648 gb_inode = ocfs2_get_system_file_inode(osb, type,
649 OCFS2_INVALID_SLOT);
650 if (!gb_inode) {
651 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
652 status = -EIO;
653 goto bail;
654 }
655 } else {
656 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
657 OCFS2_INVALID_SLOT);
658 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
659 namebuf,
660 strlen(namebuf),
661 &blkno);
662 if (status < 0) {
663 status = -ENOENT;
664 goto bail;
665 }
666 }
667
668 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
669 if (status < 0)
670 goto bail;
671
672 o2info_set_request_filled(&oiff->iff_req);
673
674 if (o2info_to_user(*oiff, req)) {
675 status = -EFAULT;
676 goto out_free;
677 }
678
679 status = 0;
680bail:
681 if (status)
682 o2info_set_request_error(&oiff->iff_req, req);
683out_free:
684 kfree(oiff);
685out_err:
686 return status;
687}
688
689static int ocfs2_info_handle_unknown(struct inode *inode,
690 struct ocfs2_info_request __user *req)
691{
692 struct ocfs2_info_request oir;
693
694 if (o2info_from_user(oir, req))
695 return -EFAULT;
696
697 o2info_clear_request_filled(&oir);
698
699 if (o2info_to_user(oir, req))
700 return -EFAULT;
701
702 return 0;
703}
704
705/*
706 * Validate and distinguish OCFS2_IOC_INFO requests.
707 *
708 * - validate the magic number.
709 * - distinguish different requests.
710 * - validate size of different requests.
711 */
712static int ocfs2_info_handle_request(struct inode *inode,
713 struct ocfs2_info_request __user *req)
714{
715 int status = -EFAULT;
716 struct ocfs2_info_request oir;
717
718 if (o2info_from_user(oir, req))
719 goto bail;
720
721 status = -EINVAL;
722 if (oir.ir_magic != OCFS2_INFO_MAGIC)
723 goto bail;
724
725 switch (oir.ir_code) {
726 case OCFS2_INFO_BLOCKSIZE:
727 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
728 status = ocfs2_info_handle_blocksize(inode, req);
729 break;
730 case OCFS2_INFO_CLUSTERSIZE:
731 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
732 status = ocfs2_info_handle_clustersize(inode, req);
733 break;
734 case OCFS2_INFO_MAXSLOTS:
735 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
736 status = ocfs2_info_handle_maxslots(inode, req);
737 break;
738 case OCFS2_INFO_LABEL:
739 if (oir.ir_size == sizeof(struct ocfs2_info_label))
740 status = ocfs2_info_handle_label(inode, req);
741 break;
742 case OCFS2_INFO_UUID:
743 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
744 status = ocfs2_info_handle_uuid(inode, req);
745 break;
746 case OCFS2_INFO_FS_FEATURES:
747 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
748 status = ocfs2_info_handle_fs_features(inode, req);
749 break;
750 case OCFS2_INFO_JOURNAL_SIZE:
751 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
752 status = ocfs2_info_handle_journal_size(inode, req);
753 break;
754 case OCFS2_INFO_FREEINODE:
755 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
756 status = ocfs2_info_handle_freeinode(inode, req);
757 break;
758 case OCFS2_INFO_FREEFRAG:
759 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
760 status = ocfs2_info_handle_freefrag(inode, req);
761 break;
762 default:
763 status = ocfs2_info_handle_unknown(inode, req);
764 break;
765 }
766
767bail:
768 return status;
769}
770
771static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
772 u64 *req_addr, int compat_flag)
773{
774 int status = -EFAULT;
775 u64 __user *bp = NULL;
776
777 if (compat_flag) {
778#ifdef CONFIG_COMPAT
779 /*
780 * pointer bp stores the base address of a pointers array,
781 * which collects all addresses of separate request.
782 */
783 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
784#else
785 BUG();
786#endif
787 } else
788 bp = (u64 __user *)(unsigned long)(info->oi_requests);
789
790 if (o2info_from_user(*req_addr, bp + idx))
791 goto bail;
792
793 status = 0;
794bail:
795 return status;
796}
797
798/*
799 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
800 *
801 * ocfs2_info_handle() recevies a large info aggregation, grab and
802 * validate the request count from header, then break it into small
803 * pieces, later specific handlers can handle them one by one.
804 *
805 * Idea here is to make each separate request small enough to ensure
806 * a better backward&forward compatibility, since a small piece of
807 * request will be less likely to be broken if disk layout get changed.
808 */
809static int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
810 int compat_flag)
811{
812 int i, status = 0;
813 u64 req_addr;
814 struct ocfs2_info_request __user *reqp;
815
816 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
817 (!info->oi_requests)) {
818 status = -EINVAL;
819 goto bail;
820 }
821
822 for (i = 0; i < info->oi_count; i++) {
823
824 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
825 if (status)
826 break;
827
828 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
829 if (!reqp) {
830 status = -EINVAL;
831 goto bail;
832 }
833
834 status = ocfs2_info_handle_request(inode, reqp);
835 if (status)
836 break;
837 }
838
839bail:
840 return status;
841}
842
843long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
844{
845 struct inode *inode = file_inode(filp);
846 unsigned int flags;
847 int new_clusters;
848 int status;
849 struct ocfs2_space_resv sr;
850 struct ocfs2_new_group_input input;
851 struct reflink_arguments args;
852 const char __user *old_path;
853 const char __user *new_path;
854 bool preserve;
855 struct ocfs2_info info;
856 void __user *argp = (void __user *)arg;
857
858 switch (cmd) {
859 case OCFS2_IOC_GETFLAGS:
860 status = ocfs2_get_inode_attr(inode, &flags);
861 if (status < 0)
862 return status;
863
864 flags &= OCFS2_FL_VISIBLE;
865 return put_user(flags, (int __user *) arg);
866 case OCFS2_IOC_SETFLAGS:
867 if (get_user(flags, (int __user *) arg))
868 return -EFAULT;
869
870 status = mnt_want_write_file(filp);
871 if (status)
872 return status;
873 status = ocfs2_set_inode_attr(inode, flags,
874 OCFS2_FL_MODIFIABLE);
875 mnt_drop_write_file(filp);
876 return status;
877 case OCFS2_IOC_RESVSP:
878 case OCFS2_IOC_RESVSP64:
879 case OCFS2_IOC_UNRESVSP:
880 case OCFS2_IOC_UNRESVSP64:
881 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
882 return -EFAULT;
883
884 return ocfs2_change_file_space(filp, cmd, &sr);
885 case OCFS2_IOC_GROUP_EXTEND:
886 if (!capable(CAP_SYS_RESOURCE))
887 return -EPERM;
888
889 if (get_user(new_clusters, (int __user *)arg))
890 return -EFAULT;
891
892 status = mnt_want_write_file(filp);
893 if (status)
894 return status;
895 status = ocfs2_group_extend(inode, new_clusters);
896 mnt_drop_write_file(filp);
897 return status;
898 case OCFS2_IOC_GROUP_ADD:
899 case OCFS2_IOC_GROUP_ADD64:
900 if (!capable(CAP_SYS_RESOURCE))
901 return -EPERM;
902
903 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
904 return -EFAULT;
905
906 status = mnt_want_write_file(filp);
907 if (status)
908 return status;
909 status = ocfs2_group_add(inode, &input);
910 mnt_drop_write_file(filp);
911 return status;
912 case OCFS2_IOC_REFLINK:
913 if (copy_from_user(&args, argp, sizeof(args)))
914 return -EFAULT;
915 old_path = (const char __user *)(unsigned long)args.old_path;
916 new_path = (const char __user *)(unsigned long)args.new_path;
917 preserve = (args.preserve != 0);
918
919 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
920 case OCFS2_IOC_INFO:
921 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
922 return -EFAULT;
923
924 return ocfs2_info_handle(inode, &info, 0);
925 case FITRIM:
926 {
927 struct super_block *sb = inode->i_sb;
928 struct request_queue *q = bdev_get_queue(sb->s_bdev);
929 struct fstrim_range range;
930 int ret = 0;
931
932 if (!capable(CAP_SYS_ADMIN))
933 return -EPERM;
934
935 if (!blk_queue_discard(q))
936 return -EOPNOTSUPP;
937
938 if (copy_from_user(&range, argp, sizeof(range)))
939 return -EFAULT;
940
941 range.minlen = max_t(u64, q->limits.discard_granularity,
942 range.minlen);
943 ret = ocfs2_trim_fs(sb, &range);
944 if (ret < 0)
945 return ret;
946
947 if (copy_to_user(argp, &range, sizeof(range)))
948 return -EFAULT;
949
950 return 0;
951 }
952 case OCFS2_IOC_MOVE_EXT:
953 return ocfs2_ioctl_move_extents(filp, argp);
954 default:
955 return -ENOTTY;
956 }
957}
958
959#ifdef CONFIG_COMPAT
960long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
961{
962 bool preserve;
963 struct reflink_arguments args;
964 struct inode *inode = file_inode(file);
965 struct ocfs2_info info;
966 void __user *argp = (void __user *)arg;
967
968 switch (cmd) {
969 case OCFS2_IOC32_GETFLAGS:
970 cmd = OCFS2_IOC_GETFLAGS;
971 break;
972 case OCFS2_IOC32_SETFLAGS:
973 cmd = OCFS2_IOC_SETFLAGS;
974 break;
975 case OCFS2_IOC_RESVSP:
976 case OCFS2_IOC_RESVSP64:
977 case OCFS2_IOC_UNRESVSP:
978 case OCFS2_IOC_UNRESVSP64:
979 case OCFS2_IOC_GROUP_EXTEND:
980 case OCFS2_IOC_GROUP_ADD:
981 case OCFS2_IOC_GROUP_ADD64:
982 break;
983 case OCFS2_IOC_REFLINK:
984 if (copy_from_user(&args, argp, sizeof(args)))
985 return -EFAULT;
986 preserve = (args.preserve != 0);
987
988 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
989 compat_ptr(args.new_path), preserve);
990 case OCFS2_IOC_INFO:
991 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
992 return -EFAULT;
993
994 return ocfs2_info_handle(inode, &info, 1);
995 case OCFS2_IOC_MOVE_EXT:
996 break;
997 default:
998 return -ENOIOCTLCMD;
999 }
1000
1001 return ocfs2_ioctl(file, cmd, arg);
1002}
1003#endif