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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/*
2 * linux/fs/ocfs2/ioctl.c
3 *
4 * Copyright (C) 2006 Herbert Poetzl
5 * adapted from Remy Card's ext2/ioctl.c
6 */
7
8#include <linux/fs.h>
9#include <linux/mount.h>
10#include <linux/compat.h>
11
12#include <cluster/masklog.h>
13
14#include "ocfs2.h"
15#include "alloc.h"
16#include "dlmglue.h"
17#include "file.h"
18#include "inode.h"
19#include "journal.h"
20
21#include "ocfs2_fs.h"
22#include "ioctl.h"
23#include "resize.h"
24#include "refcounttree.h"
25#include "sysfile.h"
26#include "dir.h"
27#include "buffer_head_io.h"
28#include "suballoc.h"
29#include "move_extents.h"
30
31#define o2info_from_user(a, b) \
32 copy_from_user(&(a), (b), sizeof(a))
33#define o2info_to_user(a, b) \
34 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
35
36/*
37 * This call is void because we are already reporting an error that may
38 * be -EFAULT. The error will be returned from the ioctl(2) call. It's
39 * just a best-effort to tell userspace that this request caused the error.
40 */
41static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
42 struct ocfs2_info_request __user *req)
43{
44 kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
45 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
46}
47
48static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
49{
50 req->ir_flags |= OCFS2_INFO_FL_FILLED;
51}
52
53static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
54{
55 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
56}
57
58static inline int o2info_coherent(struct ocfs2_info_request *req)
59{
60 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
61}
62
63static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
64{
65 int status;
66
67 status = ocfs2_inode_lock(inode, NULL, 0);
68 if (status < 0) {
69 mlog_errno(status);
70 return status;
71 }
72 ocfs2_get_inode_flags(OCFS2_I(inode));
73 *flags = OCFS2_I(inode)->ip_attr;
74 ocfs2_inode_unlock(inode, 0);
75
76 return status;
77}
78
79static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
80 unsigned mask)
81{
82 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
83 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
84 handle_t *handle = NULL;
85 struct buffer_head *bh = NULL;
86 unsigned oldflags;
87 int status;
88
89 mutex_lock(&inode->i_mutex);
90
91 status = ocfs2_inode_lock(inode, &bh, 1);
92 if (status < 0) {
93 mlog_errno(status);
94 goto bail;
95 }
96
97 status = -EACCES;
98 if (!inode_owner_or_capable(inode))
99 goto bail_unlock;
100
101 if (!S_ISDIR(inode->i_mode))
102 flags &= ~OCFS2_DIRSYNC_FL;
103
104 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
105 if (IS_ERR(handle)) {
106 status = PTR_ERR(handle);
107 mlog_errno(status);
108 goto bail_unlock;
109 }
110
111 oldflags = ocfs2_inode->ip_attr;
112 flags = flags & mask;
113 flags |= oldflags & ~mask;
114
115 /*
116 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
117 * the relevant capability.
118 */
119 status = -EPERM;
120 if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
121 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
122 if (!capable(CAP_LINUX_IMMUTABLE))
123 goto bail_commit;
124 }
125
126 ocfs2_inode->ip_attr = flags;
127 ocfs2_set_inode_flags(inode);
128
129 status = ocfs2_mark_inode_dirty(handle, inode, bh);
130 if (status < 0)
131 mlog_errno(status);
132
133bail_commit:
134 ocfs2_commit_trans(osb, handle);
135bail_unlock:
136 ocfs2_inode_unlock(inode, 1);
137bail:
138 mutex_unlock(&inode->i_mutex);
139
140 brelse(bh);
141
142 return status;
143}
144
145int ocfs2_info_handle_blocksize(struct inode *inode,
146 struct ocfs2_info_request __user *req)
147{
148 int status = -EFAULT;
149 struct ocfs2_info_blocksize oib;
150
151 if (o2info_from_user(oib, req))
152 goto bail;
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 goto bail;
160
161 status = 0;
162bail:
163 if (status)
164 o2info_set_request_error(&oib.ib_req, req);
165
166 return status;
167}
168
169int ocfs2_info_handle_clustersize(struct inode *inode,
170 struct ocfs2_info_request __user *req)
171{
172 int status = -EFAULT;
173 struct ocfs2_info_clustersize oic;
174 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
175
176 if (o2info_from_user(oic, req))
177 goto bail;
178
179 oic.ic_clustersize = osb->s_clustersize;
180
181 o2info_set_request_filled(&oic.ic_req);
182
183 if (o2info_to_user(oic, req))
184 goto bail;
185
186 status = 0;
187bail:
188 if (status)
189 o2info_set_request_error(&oic.ic_req, req);
190
191 return status;
192}
193
194int ocfs2_info_handle_maxslots(struct inode *inode,
195 struct ocfs2_info_request __user *req)
196{
197 int status = -EFAULT;
198 struct ocfs2_info_maxslots oim;
199 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
200
201 if (o2info_from_user(oim, req))
202 goto bail;
203
204 oim.im_max_slots = osb->max_slots;
205
206 o2info_set_request_filled(&oim.im_req);
207
208 if (o2info_to_user(oim, req))
209 goto bail;
210
211 status = 0;
212bail:
213 if (status)
214 o2info_set_request_error(&oim.im_req, req);
215
216 return status;
217}
218
219int ocfs2_info_handle_label(struct inode *inode,
220 struct ocfs2_info_request __user *req)
221{
222 int status = -EFAULT;
223 struct ocfs2_info_label oil;
224 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
225
226 if (o2info_from_user(oil, req))
227 goto bail;
228
229 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
230
231 o2info_set_request_filled(&oil.il_req);
232
233 if (o2info_to_user(oil, req))
234 goto bail;
235
236 status = 0;
237bail:
238 if (status)
239 o2info_set_request_error(&oil.il_req, req);
240
241 return status;
242}
243
244int ocfs2_info_handle_uuid(struct inode *inode,
245 struct ocfs2_info_request __user *req)
246{
247 int status = -EFAULT;
248 struct ocfs2_info_uuid oiu;
249 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
250
251 if (o2info_from_user(oiu, req))
252 goto bail;
253
254 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
255
256 o2info_set_request_filled(&oiu.iu_req);
257
258 if (o2info_to_user(oiu, req))
259 goto bail;
260
261 status = 0;
262bail:
263 if (status)
264 o2info_set_request_error(&oiu.iu_req, req);
265
266 return status;
267}
268
269int ocfs2_info_handle_fs_features(struct inode *inode,
270 struct ocfs2_info_request __user *req)
271{
272 int status = -EFAULT;
273 struct ocfs2_info_fs_features oif;
274 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
275
276 if (o2info_from_user(oif, req))
277 goto bail;
278
279 oif.if_compat_features = osb->s_feature_compat;
280 oif.if_incompat_features = osb->s_feature_incompat;
281 oif.if_ro_compat_features = osb->s_feature_ro_compat;
282
283 o2info_set_request_filled(&oif.if_req);
284
285 if (o2info_to_user(oif, req))
286 goto bail;
287
288 status = 0;
289bail:
290 if (status)
291 o2info_set_request_error(&oif.if_req, req);
292
293 return status;
294}
295
296int ocfs2_info_handle_journal_size(struct inode *inode,
297 struct ocfs2_info_request __user *req)
298{
299 int status = -EFAULT;
300 struct ocfs2_info_journal_size oij;
301 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
302
303 if (o2info_from_user(oij, req))
304 goto bail;
305
306 oij.ij_journal_size = osb->journal->j_inode->i_size;
307
308 o2info_set_request_filled(&oij.ij_req);
309
310 if (o2info_to_user(oij, req))
311 goto bail;
312
313 status = 0;
314bail:
315 if (status)
316 o2info_set_request_error(&oij.ij_req, req);
317
318 return status;
319}
320
321int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
322 struct inode *inode_alloc, u64 blkno,
323 struct ocfs2_info_freeinode *fi, u32 slot)
324{
325 int status = 0, unlock = 0;
326
327 struct buffer_head *bh = NULL;
328 struct ocfs2_dinode *dinode_alloc = NULL;
329
330 if (inode_alloc)
331 mutex_lock(&inode_alloc->i_mutex);
332
333 if (o2info_coherent(&fi->ifi_req)) {
334 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
335 if (status < 0) {
336 mlog_errno(status);
337 goto bail;
338 }
339 unlock = 1;
340 } else {
341 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
342 if (status < 0) {
343 mlog_errno(status);
344 goto bail;
345 }
346 }
347
348 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
349
350 fi->ifi_stat[slot].lfi_total =
351 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
352 fi->ifi_stat[slot].lfi_free =
353 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
354 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
355
356bail:
357 if (unlock)
358 ocfs2_inode_unlock(inode_alloc, 0);
359
360 if (inode_alloc)
361 mutex_unlock(&inode_alloc->i_mutex);
362
363 brelse(bh);
364
365 return status;
366}
367
368int ocfs2_info_handle_freeinode(struct inode *inode,
369 struct ocfs2_info_request __user *req)
370{
371 u32 i;
372 u64 blkno = -1;
373 char namebuf[40];
374 int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
375 struct ocfs2_info_freeinode *oifi = NULL;
376 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
377 struct inode *inode_alloc = NULL;
378
379 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
380 if (!oifi) {
381 status = -ENOMEM;
382 mlog_errno(status);
383 goto out_err;
384 }
385
386 if (o2info_from_user(*oifi, req))
387 goto bail;
388
389 oifi->ifi_slotnum = osb->max_slots;
390
391 for (i = 0; i < oifi->ifi_slotnum; i++) {
392 if (o2info_coherent(&oifi->ifi_req)) {
393 inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
394 if (!inode_alloc) {
395 mlog(ML_ERROR, "unable to get alloc inode in "
396 "slot %u\n", i);
397 status = -EIO;
398 goto bail;
399 }
400 } else {
401 ocfs2_sprintf_system_inode_name(namebuf,
402 sizeof(namebuf),
403 type, i);
404 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
405 namebuf,
406 strlen(namebuf),
407 &blkno);
408 if (status < 0) {
409 status = -ENOENT;
410 goto bail;
411 }
412 }
413
414 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
415 if (status < 0)
416 goto bail;
417
418 iput(inode_alloc);
419 inode_alloc = NULL;
420 }
421
422 o2info_set_request_filled(&oifi->ifi_req);
423
424 if (o2info_to_user(*oifi, req))
425 goto bail;
426
427 status = 0;
428bail:
429 if (status)
430 o2info_set_request_error(&oifi->ifi_req, req);
431
432 kfree(oifi);
433out_err:
434 return status;
435}
436
437static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
438 unsigned int chunksize)
439{
440 int index;
441
442 index = __ilog2_u32(chunksize);
443 if (index >= OCFS2_INFO_MAX_HIST)
444 index = OCFS2_INFO_MAX_HIST - 1;
445
446 hist->fc_chunks[index]++;
447 hist->fc_clusters[index] += chunksize;
448}
449
450static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
451 unsigned int chunksize)
452{
453 if (chunksize > stats->ffs_max)
454 stats->ffs_max = chunksize;
455
456 if (chunksize < stats->ffs_min)
457 stats->ffs_min = chunksize;
458
459 stats->ffs_avg += chunksize;
460 stats->ffs_free_chunks_real++;
461}
462
463void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
464 unsigned int chunksize)
465{
466 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
467 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
468}
469
470int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
471 struct inode *gb_inode,
472 struct ocfs2_dinode *gb_dinode,
473 struct ocfs2_chain_rec *rec,
474 struct ocfs2_info_freefrag *ffg,
475 u32 chunks_in_group)
476{
477 int status = 0, used;
478 u64 blkno;
479
480 struct buffer_head *bh = NULL;
481 struct ocfs2_group_desc *bg = NULL;
482
483 unsigned int max_bits, num_clusters;
484 unsigned int offset = 0, cluster, chunk;
485 unsigned int chunk_free, last_chunksize = 0;
486
487 if (!le32_to_cpu(rec->c_free))
488 goto bail;
489
490 do {
491 if (!bg)
492 blkno = le64_to_cpu(rec->c_blkno);
493 else
494 blkno = le64_to_cpu(bg->bg_next_group);
495
496 if (bh) {
497 brelse(bh);
498 bh = NULL;
499 }
500
501 if (o2info_coherent(&ffg->iff_req))
502 status = ocfs2_read_group_descriptor(gb_inode,
503 gb_dinode,
504 blkno, &bh);
505 else
506 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
507
508 if (status < 0) {
509 mlog(ML_ERROR, "Can't read the group descriptor # "
510 "%llu from device.", (unsigned long long)blkno);
511 status = -EIO;
512 goto bail;
513 }
514
515 bg = (struct ocfs2_group_desc *)bh->b_data;
516
517 if (!le16_to_cpu(bg->bg_free_bits_count))
518 continue;
519
520 max_bits = le16_to_cpu(bg->bg_bits);
521 offset = 0;
522
523 for (chunk = 0; chunk < chunks_in_group; chunk++) {
524 /*
525 * last chunk may be not an entire one.
526 */
527 if ((offset + ffg->iff_chunksize) > max_bits)
528 num_clusters = max_bits - offset;
529 else
530 num_clusters = ffg->iff_chunksize;
531
532 chunk_free = 0;
533 for (cluster = 0; cluster < num_clusters; cluster++) {
534 used = ocfs2_test_bit(offset,
535 (unsigned long *)bg->bg_bitmap);
536 /*
537 * - chunk_free counts free clusters in #N chunk.
538 * - last_chunksize records the size(in) clusters
539 * for the last real free chunk being counted.
540 */
541 if (!used) {
542 last_chunksize++;
543 chunk_free++;
544 }
545
546 if (used && last_chunksize) {
547 ocfs2_info_update_ffg(ffg,
548 last_chunksize);
549 last_chunksize = 0;
550 }
551
552 offset++;
553 }
554
555 if (chunk_free == ffg->iff_chunksize)
556 ffg->iff_ffs.ffs_free_chunks++;
557 }
558
559 /*
560 * need to update the info for last free chunk.
561 */
562 if (last_chunksize)
563 ocfs2_info_update_ffg(ffg, last_chunksize);
564
565 } while (le64_to_cpu(bg->bg_next_group));
566
567bail:
568 brelse(bh);
569
570 return status;
571}
572
573int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
574 struct inode *gb_inode, u64 blkno,
575 struct ocfs2_info_freefrag *ffg)
576{
577 u32 chunks_in_group;
578 int status = 0, unlock = 0, i;
579
580 struct buffer_head *bh = NULL;
581 struct ocfs2_chain_list *cl = NULL;
582 struct ocfs2_chain_rec *rec = NULL;
583 struct ocfs2_dinode *gb_dinode = NULL;
584
585 if (gb_inode)
586 mutex_lock(&gb_inode->i_mutex);
587
588 if (o2info_coherent(&ffg->iff_req)) {
589 status = ocfs2_inode_lock(gb_inode, &bh, 0);
590 if (status < 0) {
591 mlog_errno(status);
592 goto bail;
593 }
594 unlock = 1;
595 } else {
596 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
597 if (status < 0) {
598 mlog_errno(status);
599 goto bail;
600 }
601 }
602
603 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
604 cl = &(gb_dinode->id2.i_chain);
605
606 /*
607 * Chunksize(in) clusters from userspace should be
608 * less than clusters in a group.
609 */
610 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
611 status = -EINVAL;
612 goto bail;
613 }
614
615 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
616
617 ffg->iff_ffs.ffs_min = ~0U;
618 ffg->iff_ffs.ffs_clusters =
619 le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
620 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
621 le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
622
623 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
624
625 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
626 rec = &(cl->cl_recs[i]);
627 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
628 gb_dinode,
629 rec, ffg,
630 chunks_in_group);
631 if (status)
632 goto bail;
633 }
634
635 if (ffg->iff_ffs.ffs_free_chunks_real)
636 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
637 ffg->iff_ffs.ffs_free_chunks_real);
638bail:
639 if (unlock)
640 ocfs2_inode_unlock(gb_inode, 0);
641
642 if (gb_inode)
643 mutex_unlock(&gb_inode->i_mutex);
644
645 if (gb_inode)
646 iput(gb_inode);
647
648 brelse(bh);
649
650 return status;
651}
652
653int ocfs2_info_handle_freefrag(struct inode *inode,
654 struct ocfs2_info_request __user *req)
655{
656 u64 blkno = -1;
657 char namebuf[40];
658 int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
659
660 struct ocfs2_info_freefrag *oiff;
661 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
662 struct inode *gb_inode = NULL;
663
664 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
665 if (!oiff) {
666 status = -ENOMEM;
667 mlog_errno(status);
668 goto out_err;
669 }
670
671 if (o2info_from_user(*oiff, req))
672 goto bail;
673 /*
674 * chunksize from userspace should be power of 2.
675 */
676 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
677 (!oiff->iff_chunksize)) {
678 status = -EINVAL;
679 goto bail;
680 }
681
682 if (o2info_coherent(&oiff->iff_req)) {
683 gb_inode = ocfs2_get_system_file_inode(osb, type,
684 OCFS2_INVALID_SLOT);
685 if (!gb_inode) {
686 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
687 status = -EIO;
688 goto bail;
689 }
690 } else {
691 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
692 OCFS2_INVALID_SLOT);
693 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
694 namebuf,
695 strlen(namebuf),
696 &blkno);
697 if (status < 0) {
698 status = -ENOENT;
699 goto bail;
700 }
701 }
702
703 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
704 if (status < 0)
705 goto bail;
706
707 o2info_set_request_filled(&oiff->iff_req);
708
709 if (o2info_to_user(*oiff, req))
710 goto bail;
711
712 status = 0;
713bail:
714 if (status)
715 o2info_set_request_error(&oiff->iff_req, req);
716
717 kfree(oiff);
718out_err:
719 return status;
720}
721
722int ocfs2_info_handle_unknown(struct inode *inode,
723 struct ocfs2_info_request __user *req)
724{
725 int status = -EFAULT;
726 struct ocfs2_info_request oir;
727
728 if (o2info_from_user(oir, req))
729 goto bail;
730
731 o2info_clear_request_filled(&oir);
732
733 if (o2info_to_user(oir, req))
734 goto bail;
735
736 status = 0;
737bail:
738 if (status)
739 o2info_set_request_error(&oir, req);
740
741 return status;
742}
743
744/*
745 * Validate and distinguish OCFS2_IOC_INFO requests.
746 *
747 * - validate the magic number.
748 * - distinguish different requests.
749 * - validate size of different requests.
750 */
751int ocfs2_info_handle_request(struct inode *inode,
752 struct ocfs2_info_request __user *req)
753{
754 int status = -EFAULT;
755 struct ocfs2_info_request oir;
756
757 if (o2info_from_user(oir, req))
758 goto bail;
759
760 status = -EINVAL;
761 if (oir.ir_magic != OCFS2_INFO_MAGIC)
762 goto bail;
763
764 switch (oir.ir_code) {
765 case OCFS2_INFO_BLOCKSIZE:
766 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
767 status = ocfs2_info_handle_blocksize(inode, req);
768 break;
769 case OCFS2_INFO_CLUSTERSIZE:
770 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
771 status = ocfs2_info_handle_clustersize(inode, req);
772 break;
773 case OCFS2_INFO_MAXSLOTS:
774 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
775 status = ocfs2_info_handle_maxslots(inode, req);
776 break;
777 case OCFS2_INFO_LABEL:
778 if (oir.ir_size == sizeof(struct ocfs2_info_label))
779 status = ocfs2_info_handle_label(inode, req);
780 break;
781 case OCFS2_INFO_UUID:
782 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
783 status = ocfs2_info_handle_uuid(inode, req);
784 break;
785 case OCFS2_INFO_FS_FEATURES:
786 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
787 status = ocfs2_info_handle_fs_features(inode, req);
788 break;
789 case OCFS2_INFO_JOURNAL_SIZE:
790 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
791 status = ocfs2_info_handle_journal_size(inode, req);
792 break;
793 case OCFS2_INFO_FREEINODE:
794 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
795 status = ocfs2_info_handle_freeinode(inode, req);
796 break;
797 case OCFS2_INFO_FREEFRAG:
798 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
799 status = ocfs2_info_handle_freefrag(inode, req);
800 break;
801 default:
802 status = ocfs2_info_handle_unknown(inode, req);
803 break;
804 }
805
806bail:
807 return status;
808}
809
810int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
811 u64 *req_addr, int compat_flag)
812{
813 int status = -EFAULT;
814 u64 __user *bp = NULL;
815
816 if (compat_flag) {
817#ifdef CONFIG_COMPAT
818 /*
819 * pointer bp stores the base address of a pointers array,
820 * which collects all addresses of separate request.
821 */
822 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
823#else
824 BUG();
825#endif
826 } else
827 bp = (u64 __user *)(unsigned long)(info->oi_requests);
828
829 if (o2info_from_user(*req_addr, bp + idx))
830 goto bail;
831
832 status = 0;
833bail:
834 return status;
835}
836
837/*
838 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
839 *
840 * ocfs2_info_handle() recevies a large info aggregation, grab and
841 * validate the request count from header, then break it into small
842 * pieces, later specific handlers can handle them one by one.
843 *
844 * Idea here is to make each separate request small enough to ensure
845 * a better backward&forward compatibility, since a small piece of
846 * request will be less likely to be broken if disk layout get changed.
847 */
848int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
849 int compat_flag)
850{
851 int i, status = 0;
852 u64 req_addr;
853 struct ocfs2_info_request __user *reqp;
854
855 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
856 (!info->oi_requests)) {
857 status = -EINVAL;
858 goto bail;
859 }
860
861 for (i = 0; i < info->oi_count; i++) {
862
863 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
864 if (status)
865 break;
866
867 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
868 if (!reqp) {
869 status = -EINVAL;
870 goto bail;
871 }
872
873 status = ocfs2_info_handle_request(inode, reqp);
874 if (status)
875 break;
876 }
877
878bail:
879 return status;
880}
881
882long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
883{
884 struct inode *inode = filp->f_path.dentry->d_inode;
885 unsigned int flags;
886 int new_clusters;
887 int status;
888 struct ocfs2_space_resv sr;
889 struct ocfs2_new_group_input input;
890 struct reflink_arguments args;
891 const char __user *old_path;
892 const char __user *new_path;
893 bool preserve;
894 struct ocfs2_info info;
895 void __user *argp = (void __user *)arg;
896
897 switch (cmd) {
898 case OCFS2_IOC_GETFLAGS:
899 status = ocfs2_get_inode_attr(inode, &flags);
900 if (status < 0)
901 return status;
902
903 flags &= OCFS2_FL_VISIBLE;
904 return put_user(flags, (int __user *) arg);
905 case OCFS2_IOC_SETFLAGS:
906 if (get_user(flags, (int __user *) arg))
907 return -EFAULT;
908
909 status = mnt_want_write_file(filp);
910 if (status)
911 return status;
912 status = ocfs2_set_inode_attr(inode, flags,
913 OCFS2_FL_MODIFIABLE);
914 mnt_drop_write_file(filp);
915 return status;
916 case OCFS2_IOC_RESVSP:
917 case OCFS2_IOC_RESVSP64:
918 case OCFS2_IOC_UNRESVSP:
919 case OCFS2_IOC_UNRESVSP64:
920 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
921 return -EFAULT;
922
923 return ocfs2_change_file_space(filp, cmd, &sr);
924 case OCFS2_IOC_GROUP_EXTEND:
925 if (!capable(CAP_SYS_RESOURCE))
926 return -EPERM;
927
928 if (get_user(new_clusters, (int __user *)arg))
929 return -EFAULT;
930
931 return ocfs2_group_extend(inode, new_clusters);
932 case OCFS2_IOC_GROUP_ADD:
933 case OCFS2_IOC_GROUP_ADD64:
934 if (!capable(CAP_SYS_RESOURCE))
935 return -EPERM;
936
937 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
938 return -EFAULT;
939
940 return ocfs2_group_add(inode, &input);
941 case OCFS2_IOC_REFLINK:
942 if (copy_from_user(&args, argp, sizeof(args)))
943 return -EFAULT;
944 old_path = (const char __user *)(unsigned long)args.old_path;
945 new_path = (const char __user *)(unsigned long)args.new_path;
946 preserve = (args.preserve != 0);
947
948 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
949 case OCFS2_IOC_INFO:
950 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
951 return -EFAULT;
952
953 return ocfs2_info_handle(inode, &info, 0);
954 case FITRIM:
955 {
956 struct super_block *sb = inode->i_sb;
957 struct fstrim_range range;
958 int ret = 0;
959
960 if (!capable(CAP_SYS_ADMIN))
961 return -EPERM;
962
963 if (copy_from_user(&range, argp, sizeof(range)))
964 return -EFAULT;
965
966 ret = ocfs2_trim_fs(sb, &range);
967 if (ret < 0)
968 return ret;
969
970 if (copy_to_user(argp, &range, sizeof(range)))
971 return -EFAULT;
972
973 return 0;
974 }
975 case OCFS2_IOC_MOVE_EXT:
976 return ocfs2_ioctl_move_extents(filp, argp);
977 default:
978 return -ENOTTY;
979 }
980}
981
982#ifdef CONFIG_COMPAT
983long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
984{
985 bool preserve;
986 struct reflink_arguments args;
987 struct inode *inode = file->f_path.dentry->d_inode;
988 struct ocfs2_info info;
989 void __user *argp = (void __user *)arg;
990
991 switch (cmd) {
992 case OCFS2_IOC32_GETFLAGS:
993 cmd = OCFS2_IOC_GETFLAGS;
994 break;
995 case OCFS2_IOC32_SETFLAGS:
996 cmd = OCFS2_IOC_SETFLAGS;
997 break;
998 case OCFS2_IOC_RESVSP:
999 case OCFS2_IOC_RESVSP64:
1000 case OCFS2_IOC_UNRESVSP:
1001 case OCFS2_IOC_UNRESVSP64:
1002 case OCFS2_IOC_GROUP_EXTEND:
1003 case OCFS2_IOC_GROUP_ADD:
1004 case OCFS2_IOC_GROUP_ADD64:
1005 case FITRIM:
1006 break;
1007 case OCFS2_IOC_REFLINK:
1008 if (copy_from_user(&args, argp, sizeof(args)))
1009 return -EFAULT;
1010 preserve = (args.preserve != 0);
1011
1012 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
1013 compat_ptr(args.new_path), preserve);
1014 case OCFS2_IOC_INFO:
1015 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
1016 return -EFAULT;
1017
1018 return ocfs2_info_handle(inode, &info, 1);
1019 case OCFS2_IOC_MOVE_EXT:
1020 break;
1021 default:
1022 return -ENOIOCTLCMD;
1023 }
1024
1025 return ocfs2_ioctl(file, cmd, arg);
1026}
1027#endif