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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#include <linux/ext2_fs.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 call is void because we are already reporting an error that may
40 * be -EFAULT. The error will be returned from the ioctl(2) call. It's
41 * just a best-effort to tell userspace that this request caused the error.
42 */
43static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
44 struct ocfs2_info_request __user *req)
45{
46 kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
47 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
48}
49
50static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
51{
52 req->ir_flags |= OCFS2_INFO_FL_FILLED;
53}
54
55static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
56{
57 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
58}
59
60static inline int o2info_coherent(struct ocfs2_info_request *req)
61{
62 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
63}
64
65static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
66{
67 int status;
68
69 status = ocfs2_inode_lock(inode, NULL, 0);
70 if (status < 0) {
71 mlog_errno(status);
72 return status;
73 }
74 ocfs2_get_inode_flags(OCFS2_I(inode));
75 *flags = OCFS2_I(inode)->ip_attr;
76 ocfs2_inode_unlock(inode, 0);
77
78 return status;
79}
80
81static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
82 unsigned mask)
83{
84 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
85 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
86 handle_t *handle = NULL;
87 struct buffer_head *bh = NULL;
88 unsigned oldflags;
89 int status;
90
91 mutex_lock(&inode->i_mutex);
92
93 status = ocfs2_inode_lock(inode, &bh, 1);
94 if (status < 0) {
95 mlog_errno(status);
96 goto bail;
97 }
98
99 status = -EACCES;
100 if (!inode_owner_or_capable(inode))
101 goto bail_unlock;
102
103 if (!S_ISDIR(inode->i_mode))
104 flags &= ~OCFS2_DIRSYNC_FL;
105
106 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
107 if (IS_ERR(handle)) {
108 status = PTR_ERR(handle);
109 mlog_errno(status);
110 goto bail_unlock;
111 }
112
113 oldflags = ocfs2_inode->ip_attr;
114 flags = flags & mask;
115 flags |= oldflags & ~mask;
116
117 /*
118 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
119 * the relevant capability.
120 */
121 status = -EPERM;
122 if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
123 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
124 if (!capable(CAP_LINUX_IMMUTABLE))
125 goto bail_unlock;
126 }
127
128 ocfs2_inode->ip_attr = flags;
129 ocfs2_set_inode_flags(inode);
130
131 status = ocfs2_mark_inode_dirty(handle, inode, bh);
132 if (status < 0)
133 mlog_errno(status);
134
135 ocfs2_commit_trans(osb, handle);
136bail_unlock:
137 ocfs2_inode_unlock(inode, 1);
138bail:
139 mutex_unlock(&inode->i_mutex);
140
141 brelse(bh);
142
143 return status;
144}
145
146int ocfs2_info_handle_blocksize(struct inode *inode,
147 struct ocfs2_info_request __user *req)
148{
149 int status = -EFAULT;
150 struct ocfs2_info_blocksize oib;
151
152 if (o2info_from_user(oib, req))
153 goto bail;
154
155 oib.ib_blocksize = inode->i_sb->s_blocksize;
156
157 o2info_set_request_filled(&oib.ib_req);
158
159 if (o2info_to_user(oib, req))
160 goto bail;
161
162 status = 0;
163bail:
164 if (status)
165 o2info_set_request_error(&oib.ib_req, req);
166
167 return status;
168}
169
170int ocfs2_info_handle_clustersize(struct inode *inode,
171 struct ocfs2_info_request __user *req)
172{
173 int status = -EFAULT;
174 struct ocfs2_info_clustersize oic;
175 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
176
177 if (o2info_from_user(oic, req))
178 goto bail;
179
180 oic.ic_clustersize = osb->s_clustersize;
181
182 o2info_set_request_filled(&oic.ic_req);
183
184 if (o2info_to_user(oic, req))
185 goto bail;
186
187 status = 0;
188bail:
189 if (status)
190 o2info_set_request_error(&oic.ic_req, req);
191
192 return status;
193}
194
195int ocfs2_info_handle_maxslots(struct inode *inode,
196 struct ocfs2_info_request __user *req)
197{
198 int status = -EFAULT;
199 struct ocfs2_info_maxslots oim;
200 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
201
202 if (o2info_from_user(oim, req))
203 goto bail;
204
205 oim.im_max_slots = osb->max_slots;
206
207 o2info_set_request_filled(&oim.im_req);
208
209 if (o2info_to_user(oim, req))
210 goto bail;
211
212 status = 0;
213bail:
214 if (status)
215 o2info_set_request_error(&oim.im_req, req);
216
217 return status;
218}
219
220int ocfs2_info_handle_label(struct inode *inode,
221 struct ocfs2_info_request __user *req)
222{
223 int status = -EFAULT;
224 struct ocfs2_info_label oil;
225 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
226
227 if (o2info_from_user(oil, req))
228 goto bail;
229
230 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
231
232 o2info_set_request_filled(&oil.il_req);
233
234 if (o2info_to_user(oil, req))
235 goto bail;
236
237 status = 0;
238bail:
239 if (status)
240 o2info_set_request_error(&oil.il_req, req);
241
242 return status;
243}
244
245int ocfs2_info_handle_uuid(struct inode *inode,
246 struct ocfs2_info_request __user *req)
247{
248 int status = -EFAULT;
249 struct ocfs2_info_uuid oiu;
250 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
251
252 if (o2info_from_user(oiu, req))
253 goto bail;
254
255 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
256
257 o2info_set_request_filled(&oiu.iu_req);
258
259 if (o2info_to_user(oiu, req))
260 goto bail;
261
262 status = 0;
263bail:
264 if (status)
265 o2info_set_request_error(&oiu.iu_req, req);
266
267 return status;
268}
269
270int ocfs2_info_handle_fs_features(struct inode *inode,
271 struct ocfs2_info_request __user *req)
272{
273 int status = -EFAULT;
274 struct ocfs2_info_fs_features oif;
275 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
276
277 if (o2info_from_user(oif, req))
278 goto bail;
279
280 oif.if_compat_features = osb->s_feature_compat;
281 oif.if_incompat_features = osb->s_feature_incompat;
282 oif.if_ro_compat_features = osb->s_feature_ro_compat;
283
284 o2info_set_request_filled(&oif.if_req);
285
286 if (o2info_to_user(oif, req))
287 goto bail;
288
289 status = 0;
290bail:
291 if (status)
292 o2info_set_request_error(&oif.if_req, req);
293
294 return status;
295}
296
297int ocfs2_info_handle_journal_size(struct inode *inode,
298 struct ocfs2_info_request __user *req)
299{
300 int status = -EFAULT;
301 struct ocfs2_info_journal_size oij;
302 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
303
304 if (o2info_from_user(oij, req))
305 goto bail;
306
307 oij.ij_journal_size = osb->journal->j_inode->i_size;
308
309 o2info_set_request_filled(&oij.ij_req);
310
311 if (o2info_to_user(oij, req))
312 goto bail;
313
314 status = 0;
315bail:
316 if (status)
317 o2info_set_request_error(&oij.ij_req, req);
318
319 return status;
320}
321
322int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
323 struct inode *inode_alloc, u64 blkno,
324 struct ocfs2_info_freeinode *fi, u32 slot)
325{
326 int status = 0, unlock = 0;
327
328 struct buffer_head *bh = NULL;
329 struct ocfs2_dinode *dinode_alloc = NULL;
330
331 if (inode_alloc)
332 mutex_lock(&inode_alloc->i_mutex);
333
334 if (o2info_coherent(&fi->ifi_req)) {
335 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
336 if (status < 0) {
337 mlog_errno(status);
338 goto bail;
339 }
340 unlock = 1;
341 } else {
342 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
343 if (status < 0) {
344 mlog_errno(status);
345 goto bail;
346 }
347 }
348
349 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
350
351 fi->ifi_stat[slot].lfi_total =
352 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
353 fi->ifi_stat[slot].lfi_free =
354 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
355 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
356
357bail:
358 if (unlock)
359 ocfs2_inode_unlock(inode_alloc, 0);
360
361 if (inode_alloc)
362 mutex_unlock(&inode_alloc->i_mutex);
363
364 brelse(bh);
365
366 return status;
367}
368
369int ocfs2_info_handle_freeinode(struct inode *inode,
370 struct ocfs2_info_request __user *req)
371{
372 u32 i;
373 u64 blkno = -1;
374 char namebuf[40];
375 int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
376 struct ocfs2_info_freeinode *oifi = NULL;
377 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
378 struct inode *inode_alloc = NULL;
379
380 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
381 if (!oifi) {
382 status = -ENOMEM;
383 mlog_errno(status);
384 goto bail;
385 }
386
387 if (o2info_from_user(*oifi, req))
388 goto bail;
389
390 oifi->ifi_slotnum = osb->max_slots;
391
392 for (i = 0; i < oifi->ifi_slotnum; i++) {
393 if (o2info_coherent(&oifi->ifi_req)) {
394 inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
395 if (!inode_alloc) {
396 mlog(ML_ERROR, "unable to get alloc inode in "
397 "slot %u\n", i);
398 status = -EIO;
399 goto bail;
400 }
401 } else {
402 ocfs2_sprintf_system_inode_name(namebuf,
403 sizeof(namebuf),
404 type, i);
405 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
406 namebuf,
407 strlen(namebuf),
408 &blkno);
409 if (status < 0) {
410 status = -ENOENT;
411 goto bail;
412 }
413 }
414
415 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
416 if (status < 0)
417 goto bail;
418
419 iput(inode_alloc);
420 inode_alloc = NULL;
421 }
422
423 o2info_set_request_filled(&oifi->ifi_req);
424
425 if (o2info_to_user(*oifi, req))
426 goto bail;
427
428 status = 0;
429bail:
430 if (status)
431 o2info_set_request_error(&oifi->ifi_req, req);
432
433 kfree(oifi);
434
435 return status;
436}
437
438static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
439 unsigned int chunksize)
440{
441 int index;
442
443 index = __ilog2_u32(chunksize);
444 if (index >= OCFS2_INFO_MAX_HIST)
445 index = OCFS2_INFO_MAX_HIST - 1;
446
447 hist->fc_chunks[index]++;
448 hist->fc_clusters[index] += chunksize;
449}
450
451static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
452 unsigned int chunksize)
453{
454 if (chunksize > stats->ffs_max)
455 stats->ffs_max = chunksize;
456
457 if (chunksize < stats->ffs_min)
458 stats->ffs_min = chunksize;
459
460 stats->ffs_avg += chunksize;
461 stats->ffs_free_chunks_real++;
462}
463
464void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
465 unsigned int chunksize)
466{
467 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
468 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
469}
470
471int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
472 struct inode *gb_inode,
473 struct ocfs2_dinode *gb_dinode,
474 struct ocfs2_chain_rec *rec,
475 struct ocfs2_info_freefrag *ffg,
476 u32 chunks_in_group)
477{
478 int status = 0, used;
479 u64 blkno;
480
481 struct buffer_head *bh = NULL;
482 struct ocfs2_group_desc *bg = NULL;
483
484 unsigned int max_bits, num_clusters;
485 unsigned int offset = 0, cluster, chunk;
486 unsigned int chunk_free, last_chunksize = 0;
487
488 if (!le32_to_cpu(rec->c_free))
489 goto bail;
490
491 do {
492 if (!bg)
493 blkno = le64_to_cpu(rec->c_blkno);
494 else
495 blkno = le64_to_cpu(bg->bg_next_group);
496
497 if (bh) {
498 brelse(bh);
499 bh = NULL;
500 }
501
502 if (o2info_coherent(&ffg->iff_req))
503 status = ocfs2_read_group_descriptor(gb_inode,
504 gb_dinode,
505 blkno, &bh);
506 else
507 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
508
509 if (status < 0) {
510 mlog(ML_ERROR, "Can't read the group descriptor # "
511 "%llu from device.", (unsigned long long)blkno);
512 status = -EIO;
513 goto bail;
514 }
515
516 bg = (struct ocfs2_group_desc *)bh->b_data;
517
518 if (!le16_to_cpu(bg->bg_free_bits_count))
519 continue;
520
521 max_bits = le16_to_cpu(bg->bg_bits);
522 offset = 0;
523
524 for (chunk = 0; chunk < chunks_in_group; chunk++) {
525 /*
526 * last chunk may be not an entire one.
527 */
528 if ((offset + ffg->iff_chunksize) > max_bits)
529 num_clusters = max_bits - offset;
530 else
531 num_clusters = ffg->iff_chunksize;
532
533 chunk_free = 0;
534 for (cluster = 0; cluster < num_clusters; cluster++) {
535 used = ocfs2_test_bit(offset,
536 (unsigned long *)bg->bg_bitmap);
537 /*
538 * - chunk_free counts free clusters in #N chunk.
539 * - last_chunksize records the size(in) clusters
540 * for the last real free chunk being counted.
541 */
542 if (!used) {
543 last_chunksize++;
544 chunk_free++;
545 }
546
547 if (used && last_chunksize) {
548 ocfs2_info_update_ffg(ffg,
549 last_chunksize);
550 last_chunksize = 0;
551 }
552
553 offset++;
554 }
555
556 if (chunk_free == ffg->iff_chunksize)
557 ffg->iff_ffs.ffs_free_chunks++;
558 }
559
560 /*
561 * need to update the info for last free chunk.
562 */
563 if (last_chunksize)
564 ocfs2_info_update_ffg(ffg, last_chunksize);
565
566 } while (le64_to_cpu(bg->bg_next_group));
567
568bail:
569 brelse(bh);
570
571 return status;
572}
573
574int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
575 struct inode *gb_inode, u64 blkno,
576 struct ocfs2_info_freefrag *ffg)
577{
578 u32 chunks_in_group;
579 int status = 0, unlock = 0, i;
580
581 struct buffer_head *bh = NULL;
582 struct ocfs2_chain_list *cl = NULL;
583 struct ocfs2_chain_rec *rec = NULL;
584 struct ocfs2_dinode *gb_dinode = NULL;
585
586 if (gb_inode)
587 mutex_lock(&gb_inode->i_mutex);
588
589 if (o2info_coherent(&ffg->iff_req)) {
590 status = ocfs2_inode_lock(gb_inode, &bh, 0);
591 if (status < 0) {
592 mlog_errno(status);
593 goto bail;
594 }
595 unlock = 1;
596 } else {
597 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
598 if (status < 0) {
599 mlog_errno(status);
600 goto bail;
601 }
602 }
603
604 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
605 cl = &(gb_dinode->id2.i_chain);
606
607 /*
608 * Chunksize(in) clusters from userspace should be
609 * less than clusters in a group.
610 */
611 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
612 status = -EINVAL;
613 goto bail;
614 }
615
616 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
617
618 ffg->iff_ffs.ffs_min = ~0U;
619 ffg->iff_ffs.ffs_clusters =
620 le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
621 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
622 le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
623
624 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
625
626 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
627 rec = &(cl->cl_recs[i]);
628 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
629 gb_dinode,
630 rec, ffg,
631 chunks_in_group);
632 if (status)
633 goto bail;
634 }
635
636 if (ffg->iff_ffs.ffs_free_chunks_real)
637 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
638 ffg->iff_ffs.ffs_free_chunks_real);
639bail:
640 if (unlock)
641 ocfs2_inode_unlock(gb_inode, 0);
642
643 if (gb_inode)
644 mutex_unlock(&gb_inode->i_mutex);
645
646 if (gb_inode)
647 iput(gb_inode);
648
649 brelse(bh);
650
651 return status;
652}
653
654int ocfs2_info_handle_freefrag(struct inode *inode,
655 struct ocfs2_info_request __user *req)
656{
657 u64 blkno = -1;
658 char namebuf[40];
659 int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
660
661 struct ocfs2_info_freefrag *oiff;
662 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
663 struct inode *gb_inode = NULL;
664
665 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
666 if (!oiff) {
667 status = -ENOMEM;
668 mlog_errno(status);
669 goto bail;
670 }
671
672 if (o2info_from_user(*oiff, req))
673 goto bail;
674 /*
675 * chunksize from userspace should be power of 2.
676 */
677 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
678 (!oiff->iff_chunksize)) {
679 status = -EINVAL;
680 goto bail;
681 }
682
683 if (o2info_coherent(&oiff->iff_req)) {
684 gb_inode = ocfs2_get_system_file_inode(osb, type,
685 OCFS2_INVALID_SLOT);
686 if (!gb_inode) {
687 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
688 status = -EIO;
689 goto bail;
690 }
691 } else {
692 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
693 OCFS2_INVALID_SLOT);
694 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
695 namebuf,
696 strlen(namebuf),
697 &blkno);
698 if (status < 0) {
699 status = -ENOENT;
700 goto bail;
701 }
702 }
703
704 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
705 if (status < 0)
706 goto bail;
707
708 o2info_set_request_filled(&oiff->iff_req);
709
710 if (o2info_to_user(*oiff, req))
711 goto bail;
712
713 status = 0;
714bail:
715 if (status)
716 o2info_set_request_error(&oiff->iff_req, req);
717
718 kfree(oiff);
719
720 return status;
721}
722
723int ocfs2_info_handle_unknown(struct inode *inode,
724 struct ocfs2_info_request __user *req)
725{
726 int status = -EFAULT;
727 struct ocfs2_info_request oir;
728
729 if (o2info_from_user(oir, req))
730 goto bail;
731
732 o2info_clear_request_filled(&oir);
733
734 if (o2info_to_user(oir, req))
735 goto bail;
736
737 status = 0;
738bail:
739 if (status)
740 o2info_set_request_error(&oir, req);
741
742 return status;
743}
744
745/*
746 * Validate and distinguish OCFS2_IOC_INFO requests.
747 *
748 * - validate the magic number.
749 * - distinguish different requests.
750 * - validate size of different requests.
751 */
752int ocfs2_info_handle_request(struct inode *inode,
753 struct ocfs2_info_request __user *req)
754{
755 int status = -EFAULT;
756 struct ocfs2_info_request oir;
757
758 if (o2info_from_user(oir, req))
759 goto bail;
760
761 status = -EINVAL;
762 if (oir.ir_magic != OCFS2_INFO_MAGIC)
763 goto bail;
764
765 switch (oir.ir_code) {
766 case OCFS2_INFO_BLOCKSIZE:
767 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
768 status = ocfs2_info_handle_blocksize(inode, req);
769 break;
770 case OCFS2_INFO_CLUSTERSIZE:
771 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
772 status = ocfs2_info_handle_clustersize(inode, req);
773 break;
774 case OCFS2_INFO_MAXSLOTS:
775 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
776 status = ocfs2_info_handle_maxslots(inode, req);
777 break;
778 case OCFS2_INFO_LABEL:
779 if (oir.ir_size == sizeof(struct ocfs2_info_label))
780 status = ocfs2_info_handle_label(inode, req);
781 break;
782 case OCFS2_INFO_UUID:
783 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
784 status = ocfs2_info_handle_uuid(inode, req);
785 break;
786 case OCFS2_INFO_FS_FEATURES:
787 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
788 status = ocfs2_info_handle_fs_features(inode, req);
789 break;
790 case OCFS2_INFO_JOURNAL_SIZE:
791 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
792 status = ocfs2_info_handle_journal_size(inode, req);
793 break;
794 case OCFS2_INFO_FREEINODE:
795 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
796 status = ocfs2_info_handle_freeinode(inode, req);
797 break;
798 case OCFS2_INFO_FREEFRAG:
799 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
800 status = ocfs2_info_handle_freefrag(inode, req);
801 break;
802 default:
803 status = ocfs2_info_handle_unknown(inode, req);
804 break;
805 }
806
807bail:
808 return status;
809}
810
811int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
812 u64 *req_addr, int compat_flag)
813{
814 int status = -EFAULT;
815 u64 __user *bp = NULL;
816
817 if (compat_flag) {
818#ifdef CONFIG_COMPAT
819 /*
820 * pointer bp stores the base address of a pointers array,
821 * which collects all addresses of separate request.
822 */
823 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
824#else
825 BUG();
826#endif
827 } else
828 bp = (u64 __user *)(unsigned long)(info->oi_requests);
829
830 if (o2info_from_user(*req_addr, bp + idx))
831 goto bail;
832
833 status = 0;
834bail:
835 return status;
836}
837
838/*
839 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
840 *
841 * ocfs2_info_handle() recevies a large info aggregation, grab and
842 * validate the request count from header, then break it into small
843 * pieces, later specific handlers can handle them one by one.
844 *
845 * Idea here is to make each separate request small enough to ensure
846 * a better backward&forward compatibility, since a small piece of
847 * request will be less likely to be broken if disk layout get changed.
848 */
849int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
850 int compat_flag)
851{
852 int i, status = 0;
853 u64 req_addr;
854 struct ocfs2_info_request __user *reqp;
855
856 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
857 (!info->oi_requests)) {
858 status = -EINVAL;
859 goto bail;
860 }
861
862 for (i = 0; i < info->oi_count; i++) {
863
864 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
865 if (status)
866 break;
867
868 reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
869 if (!reqp) {
870 status = -EINVAL;
871 goto bail;
872 }
873
874 status = ocfs2_info_handle_request(inode, reqp);
875 if (status)
876 break;
877 }
878
879bail:
880 return status;
881}
882
883long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
884{
885 struct inode *inode = filp->f_path.dentry->d_inode;
886 unsigned int flags;
887 int new_clusters;
888 int status;
889 struct ocfs2_space_resv sr;
890 struct ocfs2_new_group_input input;
891 struct reflink_arguments args;
892 const char *old_path, *new_path;
893 bool preserve;
894 struct ocfs2_info info;
895
896 switch (cmd) {
897 case OCFS2_IOC_GETFLAGS:
898 status = ocfs2_get_inode_attr(inode, &flags);
899 if (status < 0)
900 return status;
901
902 flags &= OCFS2_FL_VISIBLE;
903 return put_user(flags, (int __user *) arg);
904 case OCFS2_IOC_SETFLAGS:
905 if (get_user(flags, (int __user *) arg))
906 return -EFAULT;
907
908 status = mnt_want_write(filp->f_path.mnt);
909 if (status)
910 return status;
911 status = ocfs2_set_inode_attr(inode, flags,
912 OCFS2_FL_MODIFIABLE);
913 mnt_drop_write(filp->f_path.mnt);
914 return status;
915 case OCFS2_IOC_RESVSP:
916 case OCFS2_IOC_RESVSP64:
917 case OCFS2_IOC_UNRESVSP:
918 case OCFS2_IOC_UNRESVSP64:
919 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
920 return -EFAULT;
921
922 return ocfs2_change_file_space(filp, cmd, &sr);
923 case OCFS2_IOC_GROUP_EXTEND:
924 if (!capable(CAP_SYS_RESOURCE))
925 return -EPERM;
926
927 if (get_user(new_clusters, (int __user *)arg))
928 return -EFAULT;
929
930 return ocfs2_group_extend(inode, new_clusters);
931 case OCFS2_IOC_GROUP_ADD:
932 case OCFS2_IOC_GROUP_ADD64:
933 if (!capable(CAP_SYS_RESOURCE))
934 return -EPERM;
935
936 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
937 return -EFAULT;
938
939 return ocfs2_group_add(inode, &input);
940 case OCFS2_IOC_REFLINK:
941 if (copy_from_user(&args, (struct reflink_arguments *)arg,
942 sizeof(args)))
943 return -EFAULT;
944 old_path = (const char *)(unsigned long)args.old_path;
945 new_path = (const char *)(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, (struct ocfs2_info __user *)arg,
951 sizeof(struct ocfs2_info)))
952 return -EFAULT;
953
954 return ocfs2_info_handle(inode, &info, 0);
955 case FITRIM:
956 {
957 struct super_block *sb = inode->i_sb;
958 struct fstrim_range range;
959 int ret = 0;
960
961 if (!capable(CAP_SYS_ADMIN))
962 return -EPERM;
963
964 if (copy_from_user(&range, (struct fstrim_range *)arg,
965 sizeof(range)))
966 return -EFAULT;
967
968 ret = ocfs2_trim_fs(sb, &range);
969 if (ret < 0)
970 return ret;
971
972 if (copy_to_user((struct fstrim_range *)arg, &range,
973 sizeof(range)))
974 return -EFAULT;
975
976 return 0;
977 }
978 case OCFS2_IOC_MOVE_EXT:
979 return ocfs2_ioctl_move_extents(filp, (void __user *)arg);
980 default:
981 return -ENOTTY;
982 }
983}
984
985#ifdef CONFIG_COMPAT
986long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
987{
988 bool preserve;
989 struct reflink_arguments args;
990 struct inode *inode = file->f_path.dentry->d_inode;
991 struct ocfs2_info info;
992
993 switch (cmd) {
994 case OCFS2_IOC32_GETFLAGS:
995 cmd = OCFS2_IOC_GETFLAGS;
996 break;
997 case OCFS2_IOC32_SETFLAGS:
998 cmd = OCFS2_IOC_SETFLAGS;
999 break;
1000 case OCFS2_IOC_RESVSP:
1001 case OCFS2_IOC_RESVSP64:
1002 case OCFS2_IOC_UNRESVSP:
1003 case OCFS2_IOC_UNRESVSP64:
1004 case OCFS2_IOC_GROUP_EXTEND:
1005 case OCFS2_IOC_GROUP_ADD:
1006 case OCFS2_IOC_GROUP_ADD64:
1007 case FITRIM:
1008 break;
1009 case OCFS2_IOC_REFLINK:
1010 if (copy_from_user(&args, (struct reflink_arguments *)arg,
1011 sizeof(args)))
1012 return -EFAULT;
1013 preserve = (args.preserve != 0);
1014
1015 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
1016 compat_ptr(args.new_path), preserve);
1017 case OCFS2_IOC_INFO:
1018 if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
1019 sizeof(struct ocfs2_info)))
1020 return -EFAULT;
1021
1022 return ocfs2_info_handle(inode, &info, 1);
1023 case OCFS2_IOC_MOVE_EXT:
1024 break;
1025 default:
1026 return -ENOIOCTLCMD;
1027 }
1028
1029 return ocfs2_ioctl(file, cmd, arg);
1030}
1031#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#include <linux/fileattr.h>
14
15#include <cluster/masklog.h>
16
17#include "ocfs2.h"
18#include "alloc.h"
19#include "dlmglue.h"
20#include "file.h"
21#include "inode.h"
22#include "journal.h"
23
24#include "ocfs2_fs.h"
25#include "ioctl.h"
26#include "resize.h"
27#include "refcounttree.h"
28#include "sysfile.h"
29#include "dir.h"
30#include "buffer_head_io.h"
31#include "suballoc.h"
32#include "move_extents.h"
33
34#define o2info_from_user(a, b) \
35 copy_from_user(&(a), (b), sizeof(a))
36#define o2info_to_user(a, b) \
37 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
38
39/*
40 * This is just a best-effort to tell userspace that this request
41 * caused the error.
42 */
43static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
44 struct ocfs2_info_request __user *req)
45{
46 kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
47 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
48}
49
50static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
51{
52 req->ir_flags |= OCFS2_INFO_FL_FILLED;
53}
54
55static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
56{
57 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
58}
59
60static inline int o2info_coherent(struct ocfs2_info_request *req)
61{
62 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
63}
64
65int ocfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
66{
67 struct inode *inode = d_inode(dentry);
68 unsigned int flags;
69 int status;
70
71 status = ocfs2_inode_lock(inode, NULL, 0);
72 if (status < 0) {
73 mlog_errno(status);
74 return status;
75 }
76 ocfs2_get_inode_flags(OCFS2_I(inode));
77 flags = OCFS2_I(inode)->ip_attr;
78 ocfs2_inode_unlock(inode, 0);
79
80 fileattr_fill_flags(fa, flags & OCFS2_FL_VISIBLE);
81
82 return status;
83}
84
85int ocfs2_fileattr_set(struct mnt_idmap *idmap,
86 struct dentry *dentry, struct fileattr *fa)
87{
88 struct inode *inode = d_inode(dentry);
89 unsigned int flags = fa->flags;
90 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
91 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
92 handle_t *handle = NULL;
93 struct buffer_head *bh = NULL;
94 unsigned oldflags;
95 int status;
96
97 if (fileattr_has_fsx(fa))
98 return -EOPNOTSUPP;
99
100 status = ocfs2_inode_lock(inode, &bh, 1);
101 if (status < 0) {
102 mlog_errno(status);
103 goto bail;
104 }
105
106 if (!S_ISDIR(inode->i_mode))
107 flags &= ~OCFS2_DIRSYNC_FL;
108
109 oldflags = ocfs2_inode->ip_attr;
110 flags = flags & OCFS2_FL_MODIFIABLE;
111 flags |= oldflags & ~OCFS2_FL_MODIFIABLE;
112
113 /* Check already done by VFS, but repeat with ocfs lock */
114 status = -EPERM;
115 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
116 !capable(CAP_LINUX_IMMUTABLE))
117 goto bail_unlock;
118
119 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
120 if (IS_ERR(handle)) {
121 status = PTR_ERR(handle);
122 mlog_errno(status);
123 goto bail_unlock;
124 }
125
126 ocfs2_inode->ip_attr = flags;
127 ocfs2_set_inode_flags(inode);
128
129 status = ocfs2_mark_inode_dirty(handle, inode, bh);
130 if (status < 0)
131 mlog_errno(status);
132
133 ocfs2_commit_trans(osb, handle);
134
135bail_unlock:
136 ocfs2_inode_unlock(inode, 1);
137bail:
138 brelse(bh);
139
140 return status;
141}
142
143static int ocfs2_info_handle_blocksize(struct inode *inode,
144 struct ocfs2_info_request __user *req)
145{
146 struct ocfs2_info_blocksize oib;
147
148 if (o2info_from_user(oib, req))
149 return -EFAULT;
150
151 oib.ib_blocksize = inode->i_sb->s_blocksize;
152
153 o2info_set_request_filled(&oib.ib_req);
154
155 if (o2info_to_user(oib, req))
156 return -EFAULT;
157
158 return 0;
159}
160
161static int ocfs2_info_handle_clustersize(struct inode *inode,
162 struct ocfs2_info_request __user *req)
163{
164 struct ocfs2_info_clustersize oic;
165 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
166
167 if (o2info_from_user(oic, req))
168 return -EFAULT;
169
170 oic.ic_clustersize = osb->s_clustersize;
171
172 o2info_set_request_filled(&oic.ic_req);
173
174 if (o2info_to_user(oic, req))
175 return -EFAULT;
176
177 return 0;
178}
179
180static int ocfs2_info_handle_maxslots(struct inode *inode,
181 struct ocfs2_info_request __user *req)
182{
183 struct ocfs2_info_maxslots oim;
184 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
185
186 if (o2info_from_user(oim, req))
187 return -EFAULT;
188
189 oim.im_max_slots = osb->max_slots;
190
191 o2info_set_request_filled(&oim.im_req);
192
193 if (o2info_to_user(oim, req))
194 return -EFAULT;
195
196 return 0;
197}
198
199static int ocfs2_info_handle_label(struct inode *inode,
200 struct ocfs2_info_request __user *req)
201{
202 struct ocfs2_info_label oil;
203 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
204
205 if (o2info_from_user(oil, req))
206 return -EFAULT;
207
208 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
209
210 o2info_set_request_filled(&oil.il_req);
211
212 if (o2info_to_user(oil, req))
213 return -EFAULT;
214
215 return 0;
216}
217
218static int ocfs2_info_handle_uuid(struct inode *inode,
219 struct ocfs2_info_request __user *req)
220{
221 struct ocfs2_info_uuid oiu;
222 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
223
224 if (o2info_from_user(oiu, req))
225 return -EFAULT;
226
227 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
228
229 o2info_set_request_filled(&oiu.iu_req);
230
231 if (o2info_to_user(oiu, req))
232 return -EFAULT;
233
234 return 0;
235}
236
237static int ocfs2_info_handle_fs_features(struct inode *inode,
238 struct ocfs2_info_request __user *req)
239{
240 struct ocfs2_info_fs_features oif;
241 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
242
243 if (o2info_from_user(oif, req))
244 return -EFAULT;
245
246 oif.if_compat_features = osb->s_feature_compat;
247 oif.if_incompat_features = osb->s_feature_incompat;
248 oif.if_ro_compat_features = osb->s_feature_ro_compat;
249
250 o2info_set_request_filled(&oif.if_req);
251
252 if (o2info_to_user(oif, req))
253 return -EFAULT;
254
255 return 0;
256}
257
258static int ocfs2_info_handle_journal_size(struct inode *inode,
259 struct ocfs2_info_request __user *req)
260{
261 struct ocfs2_info_journal_size oij;
262 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
263
264 if (o2info_from_user(oij, req))
265 return -EFAULT;
266
267 oij.ij_journal_size = i_size_read(osb->journal->j_inode);
268
269 o2info_set_request_filled(&oij.ij_req);
270
271 if (o2info_to_user(oij, req))
272 return -EFAULT;
273
274 return 0;
275}
276
277static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
278 struct inode *inode_alloc, u64 blkno,
279 struct ocfs2_info_freeinode *fi,
280 u32 slot)
281{
282 int status = 0, unlock = 0;
283
284 struct buffer_head *bh = NULL;
285 struct ocfs2_dinode *dinode_alloc = NULL;
286
287 if (inode_alloc)
288 inode_lock(inode_alloc);
289
290 if (inode_alloc && o2info_coherent(&fi->ifi_req)) {
291 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
292 if (status < 0) {
293 mlog_errno(status);
294 goto bail;
295 }
296 unlock = 1;
297 } else {
298 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
299 if (status < 0) {
300 mlog_errno(status);
301 goto bail;
302 }
303 }
304
305 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
306
307 fi->ifi_stat[slot].lfi_total =
308 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
309 fi->ifi_stat[slot].lfi_free =
310 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
311 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
312
313bail:
314 if (unlock)
315 ocfs2_inode_unlock(inode_alloc, 0);
316
317 if (inode_alloc)
318 inode_unlock(inode_alloc);
319
320 brelse(bh);
321
322 return status;
323}
324
325static int ocfs2_info_handle_freeinode(struct inode *inode,
326 struct ocfs2_info_request __user *req)
327{
328 u32 i;
329 u64 blkno = -1;
330 char namebuf[40];
331 int status, type = INODE_ALLOC_SYSTEM_INODE;
332 struct ocfs2_info_freeinode *oifi = NULL;
333 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
334 struct inode *inode_alloc = NULL;
335
336 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
337 if (!oifi) {
338 status = -ENOMEM;
339 mlog_errno(status);
340 goto out_err;
341 }
342
343 if (o2info_from_user(*oifi, req)) {
344 status = -EFAULT;
345 goto out_free;
346 }
347
348 oifi->ifi_slotnum = osb->max_slots;
349
350 for (i = 0; i < oifi->ifi_slotnum; i++) {
351 if (o2info_coherent(&oifi->ifi_req)) {
352 inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
353 if (!inode_alloc) {
354 mlog(ML_ERROR, "unable to get alloc inode in "
355 "slot %u\n", i);
356 status = -EIO;
357 goto bail;
358 }
359 } else {
360 ocfs2_sprintf_system_inode_name(namebuf,
361 sizeof(namebuf),
362 type, i);
363 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
364 namebuf,
365 strlen(namebuf),
366 &blkno);
367 if (status < 0) {
368 status = -ENOENT;
369 goto bail;
370 }
371 }
372
373 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
374
375 iput(inode_alloc);
376 inode_alloc = NULL;
377
378 if (status < 0)
379 goto bail;
380 }
381
382 o2info_set_request_filled(&oifi->ifi_req);
383
384 if (o2info_to_user(*oifi, req)) {
385 status = -EFAULT;
386 goto out_free;
387 }
388
389 status = 0;
390bail:
391 if (status)
392 o2info_set_request_error(&oifi->ifi_req, req);
393out_free:
394 kfree(oifi);
395out_err:
396 return status;
397}
398
399static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
400 unsigned int chunksize)
401{
402 u32 index;
403
404 index = __ilog2_u32(chunksize);
405 if (index >= OCFS2_INFO_MAX_HIST)
406 index = OCFS2_INFO_MAX_HIST - 1;
407
408 hist->fc_chunks[index]++;
409 hist->fc_clusters[index] += chunksize;
410}
411
412static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
413 unsigned int chunksize)
414{
415 if (chunksize > stats->ffs_max)
416 stats->ffs_max = chunksize;
417
418 if (chunksize < stats->ffs_min)
419 stats->ffs_min = chunksize;
420
421 stats->ffs_avg += chunksize;
422 stats->ffs_free_chunks_real++;
423}
424
425static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
426 unsigned int chunksize)
427{
428 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
429 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
430}
431
432static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
433 struct inode *gb_inode,
434 struct ocfs2_dinode *gb_dinode,
435 struct ocfs2_chain_rec *rec,
436 struct ocfs2_info_freefrag *ffg,
437 u32 chunks_in_group)
438{
439 int status = 0, used;
440 u64 blkno;
441
442 struct buffer_head *bh = NULL;
443 struct ocfs2_group_desc *bg = NULL;
444
445 unsigned int max_bits, num_clusters;
446 unsigned int offset = 0, cluster, chunk;
447 unsigned int chunk_free, last_chunksize = 0;
448
449 if (!le32_to_cpu(rec->c_free))
450 goto bail;
451
452 do {
453 if (!bg)
454 blkno = le64_to_cpu(rec->c_blkno);
455 else
456 blkno = le64_to_cpu(bg->bg_next_group);
457
458 if (bh) {
459 brelse(bh);
460 bh = NULL;
461 }
462
463 if (o2info_coherent(&ffg->iff_req))
464 status = ocfs2_read_group_descriptor(gb_inode,
465 gb_dinode,
466 blkno, &bh);
467 else
468 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
469
470 if (status < 0) {
471 mlog(ML_ERROR, "Can't read the group descriptor # "
472 "%llu from device.", (unsigned long long)blkno);
473 status = -EIO;
474 goto bail;
475 }
476
477 bg = (struct ocfs2_group_desc *)bh->b_data;
478
479 if (!le16_to_cpu(bg->bg_free_bits_count))
480 continue;
481
482 max_bits = le16_to_cpu(bg->bg_bits);
483 offset = 0;
484
485 for (chunk = 0; chunk < chunks_in_group; chunk++) {
486 /*
487 * last chunk may be not an entire one.
488 */
489 if ((offset + ffg->iff_chunksize) > max_bits)
490 num_clusters = max_bits - offset;
491 else
492 num_clusters = ffg->iff_chunksize;
493
494 chunk_free = 0;
495 for (cluster = 0; cluster < num_clusters; cluster++) {
496 used = ocfs2_test_bit(offset,
497 (unsigned long *)bg->bg_bitmap);
498 /*
499 * - chunk_free counts free clusters in #N chunk.
500 * - last_chunksize records the size(in) clusters
501 * for the last real free chunk being counted.
502 */
503 if (!used) {
504 last_chunksize++;
505 chunk_free++;
506 }
507
508 if (used && last_chunksize) {
509 ocfs2_info_update_ffg(ffg,
510 last_chunksize);
511 last_chunksize = 0;
512 }
513
514 offset++;
515 }
516
517 if (chunk_free == ffg->iff_chunksize)
518 ffg->iff_ffs.ffs_free_chunks++;
519 }
520
521 /*
522 * need to update the info for last free chunk.
523 */
524 if (last_chunksize)
525 ocfs2_info_update_ffg(ffg, last_chunksize);
526
527 } while (le64_to_cpu(bg->bg_next_group));
528
529bail:
530 brelse(bh);
531
532 return status;
533}
534
535static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
536 struct inode *gb_inode, u64 blkno,
537 struct ocfs2_info_freefrag *ffg)
538{
539 u32 chunks_in_group;
540 int status = 0, unlock = 0, i;
541
542 struct buffer_head *bh = NULL;
543 struct ocfs2_chain_list *cl = NULL;
544 struct ocfs2_chain_rec *rec = NULL;
545 struct ocfs2_dinode *gb_dinode = NULL;
546
547 if (gb_inode)
548 inode_lock(gb_inode);
549
550 if (o2info_coherent(&ffg->iff_req)) {
551 status = ocfs2_inode_lock(gb_inode, &bh, 0);
552 if (status < 0) {
553 mlog_errno(status);
554 goto bail;
555 }
556 unlock = 1;
557 } else {
558 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
559 if (status < 0) {
560 mlog_errno(status);
561 goto bail;
562 }
563 }
564
565 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
566 cl = &(gb_dinode->id2.i_chain);
567
568 /*
569 * Chunksize(in) clusters from userspace should be
570 * less than clusters in a group.
571 */
572 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
573 status = -EINVAL;
574 goto bail;
575 }
576
577 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
578
579 ffg->iff_ffs.ffs_min = ~0U;
580 ffg->iff_ffs.ffs_clusters =
581 le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
582 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
583 le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
584
585 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
586
587 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
588 rec = &(cl->cl_recs[i]);
589 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
590 gb_dinode,
591 rec, ffg,
592 chunks_in_group);
593 if (status)
594 goto bail;
595 }
596
597 if (ffg->iff_ffs.ffs_free_chunks_real)
598 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
599 ffg->iff_ffs.ffs_free_chunks_real);
600bail:
601 if (unlock)
602 ocfs2_inode_unlock(gb_inode, 0);
603
604 if (gb_inode)
605 inode_unlock(gb_inode);
606
607 iput(gb_inode);
608 brelse(bh);
609
610 return status;
611}
612
613static int ocfs2_info_handle_freefrag(struct inode *inode,
614 struct ocfs2_info_request __user *req)
615{
616 u64 blkno = -1;
617 char namebuf[40];
618 int status, type = GLOBAL_BITMAP_SYSTEM_INODE;
619
620 struct ocfs2_info_freefrag *oiff;
621 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
622 struct inode *gb_inode = NULL;
623
624 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
625 if (!oiff) {
626 status = -ENOMEM;
627 mlog_errno(status);
628 goto out_err;
629 }
630
631 if (o2info_from_user(*oiff, req)) {
632 status = -EFAULT;
633 goto out_free;
634 }
635 /*
636 * chunksize from userspace should be power of 2.
637 */
638 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
639 (!oiff->iff_chunksize)) {
640 status = -EINVAL;
641 goto bail;
642 }
643
644 if (o2info_coherent(&oiff->iff_req)) {
645 gb_inode = ocfs2_get_system_file_inode(osb, type,
646 OCFS2_INVALID_SLOT);
647 if (!gb_inode) {
648 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
649 status = -EIO;
650 goto bail;
651 }
652 } else {
653 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
654 OCFS2_INVALID_SLOT);
655 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
656 namebuf,
657 strlen(namebuf),
658 &blkno);
659 if (status < 0) {
660 status = -ENOENT;
661 goto bail;
662 }
663 }
664
665 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
666 if (status < 0)
667 goto bail;
668
669 o2info_set_request_filled(&oiff->iff_req);
670
671 if (o2info_to_user(*oiff, req)) {
672 status = -EFAULT;
673 goto out_free;
674 }
675
676 status = 0;
677bail:
678 if (status)
679 o2info_set_request_error(&oiff->iff_req, req);
680out_free:
681 kfree(oiff);
682out_err:
683 return status;
684}
685
686static int ocfs2_info_handle_unknown(struct inode *inode,
687 struct ocfs2_info_request __user *req)
688{
689 struct ocfs2_info_request oir;
690
691 if (o2info_from_user(oir, req))
692 return -EFAULT;
693
694 o2info_clear_request_filled(&oir);
695
696 if (o2info_to_user(oir, req))
697 return -EFAULT;
698
699 return 0;
700}
701
702/*
703 * Validate and distinguish OCFS2_IOC_INFO requests.
704 *
705 * - validate the magic number.
706 * - distinguish different requests.
707 * - validate size of different requests.
708 */
709static int ocfs2_info_handle_request(struct inode *inode,
710 struct ocfs2_info_request __user *req)
711{
712 int status = -EFAULT;
713 struct ocfs2_info_request oir;
714
715 if (o2info_from_user(oir, req))
716 goto bail;
717
718 status = -EINVAL;
719 if (oir.ir_magic != OCFS2_INFO_MAGIC)
720 goto bail;
721
722 switch (oir.ir_code) {
723 case OCFS2_INFO_BLOCKSIZE:
724 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
725 status = ocfs2_info_handle_blocksize(inode, req);
726 break;
727 case OCFS2_INFO_CLUSTERSIZE:
728 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
729 status = ocfs2_info_handle_clustersize(inode, req);
730 break;
731 case OCFS2_INFO_MAXSLOTS:
732 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
733 status = ocfs2_info_handle_maxslots(inode, req);
734 break;
735 case OCFS2_INFO_LABEL:
736 if (oir.ir_size == sizeof(struct ocfs2_info_label))
737 status = ocfs2_info_handle_label(inode, req);
738 break;
739 case OCFS2_INFO_UUID:
740 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
741 status = ocfs2_info_handle_uuid(inode, req);
742 break;
743 case OCFS2_INFO_FS_FEATURES:
744 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
745 status = ocfs2_info_handle_fs_features(inode, req);
746 break;
747 case OCFS2_INFO_JOURNAL_SIZE:
748 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
749 status = ocfs2_info_handle_journal_size(inode, req);
750 break;
751 case OCFS2_INFO_FREEINODE:
752 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
753 status = ocfs2_info_handle_freeinode(inode, req);
754 break;
755 case OCFS2_INFO_FREEFRAG:
756 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
757 status = ocfs2_info_handle_freefrag(inode, req);
758 break;
759 default:
760 status = ocfs2_info_handle_unknown(inode, req);
761 break;
762 }
763
764bail:
765 return status;
766}
767
768static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
769 u64 *req_addr, int compat_flag)
770{
771 int status = -EFAULT;
772 u64 __user *bp = NULL;
773
774 if (compat_flag) {
775#ifdef CONFIG_COMPAT
776 /*
777 * pointer bp stores the base address of a pointers array,
778 * which collects all addresses of separate request.
779 */
780 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
781#else
782 BUG();
783#endif
784 } else
785 bp = (u64 __user *)(unsigned long)(info->oi_requests);
786
787 if (o2info_from_user(*req_addr, bp + idx))
788 goto bail;
789
790 status = 0;
791bail:
792 return status;
793}
794
795/*
796 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
797 *
798 * ocfs2_info_handle() recevies a large info aggregation, grab and
799 * validate the request count from header, then break it into small
800 * pieces, later specific handlers can handle them one by one.
801 *
802 * Idea here is to make each separate request small enough to ensure
803 * a better backward&forward compatibility, since a small piece of
804 * request will be less likely to be broken if disk layout get changed.
805 */
806static noinline_for_stack int
807ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, int compat_flag)
808{
809 int i, status = 0;
810 u64 req_addr;
811 struct ocfs2_info_request __user *reqp;
812
813 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
814 (!info->oi_requests)) {
815 status = -EINVAL;
816 goto bail;
817 }
818
819 for (i = 0; i < info->oi_count; i++) {
820
821 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
822 if (status)
823 break;
824
825 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
826 if (!reqp) {
827 status = -EINVAL;
828 goto bail;
829 }
830
831 status = ocfs2_info_handle_request(inode, reqp);
832 if (status)
833 break;
834 }
835
836bail:
837 return status;
838}
839
840long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
841{
842 struct inode *inode = file_inode(filp);
843 void __user *argp = (void __user *)arg;
844 int status;
845
846 switch (cmd) {
847 case OCFS2_IOC_RESVSP:
848 case OCFS2_IOC_RESVSP64:
849 case OCFS2_IOC_UNRESVSP:
850 case OCFS2_IOC_UNRESVSP64:
851 {
852 struct ocfs2_space_resv sr;
853
854 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
855 return -EFAULT;
856
857 return ocfs2_change_file_space(filp, cmd, &sr);
858 }
859 case OCFS2_IOC_GROUP_EXTEND:
860 {
861 int new_clusters;
862
863 if (!capable(CAP_SYS_RESOURCE))
864 return -EPERM;
865
866 if (get_user(new_clusters, (int __user *)arg))
867 return -EFAULT;
868
869 status = mnt_want_write_file(filp);
870 if (status)
871 return status;
872 status = ocfs2_group_extend(inode, new_clusters);
873 mnt_drop_write_file(filp);
874 return status;
875 }
876 case OCFS2_IOC_GROUP_ADD:
877 case OCFS2_IOC_GROUP_ADD64:
878 {
879 struct ocfs2_new_group_input input;
880
881 if (!capable(CAP_SYS_RESOURCE))
882 return -EPERM;
883
884 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
885 return -EFAULT;
886
887 status = mnt_want_write_file(filp);
888 if (status)
889 return status;
890 status = ocfs2_group_add(inode, &input);
891 mnt_drop_write_file(filp);
892 return status;
893 }
894 case OCFS2_IOC_REFLINK:
895 {
896 struct reflink_arguments args;
897 const char __user *old_path;
898 const char __user *new_path;
899 bool preserve;
900
901 if (copy_from_user(&args, argp, sizeof(args)))
902 return -EFAULT;
903 old_path = (const char __user *)(unsigned long)args.old_path;
904 new_path = (const char __user *)(unsigned long)args.new_path;
905 preserve = (args.preserve != 0);
906
907 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
908 }
909 case OCFS2_IOC_INFO:
910 {
911 struct ocfs2_info info;
912
913 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
914 return -EFAULT;
915
916 return ocfs2_info_handle(inode, &info, 0);
917 }
918 case FITRIM:
919 {
920 struct super_block *sb = inode->i_sb;
921 struct fstrim_range range;
922 int ret = 0;
923
924 if (!capable(CAP_SYS_ADMIN))
925 return -EPERM;
926
927 if (!bdev_max_discard_sectors(sb->s_bdev))
928 return -EOPNOTSUPP;
929
930 if (copy_from_user(&range, argp, sizeof(range)))
931 return -EFAULT;
932
933 range.minlen = max_t(u64, bdev_discard_granularity(sb->s_bdev),
934 range.minlen);
935 ret = ocfs2_trim_fs(sb, &range);
936 if (ret < 0)
937 return ret;
938
939 if (copy_to_user(argp, &range, sizeof(range)))
940 return -EFAULT;
941
942 return 0;
943 }
944 case OCFS2_IOC_MOVE_EXT:
945 return ocfs2_ioctl_move_extents(filp, argp);
946 default:
947 return -ENOTTY;
948 }
949}
950
951#ifdef CONFIG_COMPAT
952long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
953{
954 bool preserve;
955 struct reflink_arguments args;
956 struct inode *inode = file_inode(file);
957 struct ocfs2_info info;
958 void __user *argp = (void __user *)arg;
959
960 switch (cmd) {
961 case OCFS2_IOC_RESVSP:
962 case OCFS2_IOC_RESVSP64:
963 case OCFS2_IOC_UNRESVSP:
964 case OCFS2_IOC_UNRESVSP64:
965 case OCFS2_IOC_GROUP_EXTEND:
966 case OCFS2_IOC_GROUP_ADD:
967 case OCFS2_IOC_GROUP_ADD64:
968 break;
969 case OCFS2_IOC_REFLINK:
970 if (copy_from_user(&args, argp, sizeof(args)))
971 return -EFAULT;
972 preserve = (args.preserve != 0);
973
974 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
975 compat_ptr(args.new_path), preserve);
976 case OCFS2_IOC_INFO:
977 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
978 return -EFAULT;
979
980 return ocfs2_info_handle(inode, &info, 1);
981 case FITRIM:
982 case OCFS2_IOC_MOVE_EXT:
983 break;
984 default:
985 return -ENOIOCTLCMD;
986 }
987
988 return ocfs2_ioctl(file, cmd, arg);
989}
990#endif