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(oi: OCFS2_I(inode));
77 flags = OCFS2_I(inode)->ip_attr;
78 ocfs2_inode_unlock(inode, ex: 0);
79
80 fileattr_fill_flags(fa, flags: 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(ptr: handle)) {
121 status = PTR_ERR(ptr: 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, ex: 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(req: &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(req: &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(req: &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(req: &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(req: &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(req: &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(inode: osb->journal->j_inode);
268
269 o2info_set_request_filled(req: &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: inode_alloc);
289
290 if (inode_alloc && o2info_coherent(req: &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, block: blkno, nr: 1, bhs: &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: inode_alloc, ex: 0);
316
317 if (inode_alloc)
318 inode_unlock(inode: 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(size: 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(req: &oifi->ifi_req)) {
352 inode_alloc = ocfs2_get_system_file_inode(osb, type, slot: 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(buf: namebuf,
361 len: sizeof(namebuf),
362 type, slot: i);
363 status = ocfs2_lookup_ino_from_name(dir: osb->sys_root_inode,
364 name: namebuf,
365 strlen(namebuf),
366 blkno: &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, fi: oifi, slot: 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(req: &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(kreq: &oifi->ifi_req, req);
393out_free:
394 kfree(objp: 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(n: 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(hist: &(ffg->iff_ffs.ffs_fc_hist), chunksize);
429 o2ffg_update_stats(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(req: &ffg->iff_req))
464 status = ocfs2_read_group_descriptor(inode: gb_inode,
465 di: gb_dinode,
466 gd_blkno: blkno, bh: &bh);
467 else
468 status = ocfs2_read_blocks_sync(osb, block: blkno, nr: 1, bhs: &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(nr: offset,
497 addr: (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 chunksize: 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, chunksize: 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(inode: gb_inode);
549
550 if (o2info_coherent(req: &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, block: blkno, nr: 1, bhs: &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(inode: gb_inode, ex: 0);
603
604 if (gb_inode)
605 inode_unlock(inode: 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(size: 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(req: &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(buf: namebuf, len: sizeof(namebuf), type,
654 OCFS2_INVALID_SLOT);
655 status = ocfs2_lookup_ino_from_name(dir: osb->sys_root_inode,
656 name: namebuf,
657 strlen(namebuf),
658 blkno: &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, ffg: oiff);
666 if (status < 0)
667 goto bail;
668
669 o2info_set_request_filled(req: &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(kreq: &oiff->iff_req, req);
680out_free:
681 kfree(objp: 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(req: &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(uptr: 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, idx: i, req_addr: &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, req: 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(f: 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(to: &sr, from: (int __user *) arg, n: sizeof(sr)))
855 return -EFAULT;
856
857 return ocfs2_change_file_space(file: filp, cmd, sr: &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(file: filp);
870 if (status)
871 return status;
872 status = ocfs2_group_extend(inode, new_clusters);
873 mnt_drop_write_file(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(to: &input, from: (int __user *) arg, n: sizeof(input)))
885 return -EFAULT;
886
887 status = mnt_want_write_file(file: filp);
888 if (status)
889 return status;
890 status = ocfs2_group_add(inode, input: &input);
891 mnt_drop_write_file(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(to: &args, from: argp, n: 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, oldname: old_path, newname: new_path, preserve);
908 }
909 case OCFS2_IOC_INFO:
910 {
911 struct ocfs2_info info;
912
913 if (copy_from_user(to: &info, from: argp, n: sizeof(struct ocfs2_info)))
914 return -EFAULT;
915
916 return ocfs2_info_handle(inode, info: &info, compat_flag: 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(bdev: sb->s_bdev))
928 return -EOPNOTSUPP;
929
930 if (copy_from_user(to: &range, from: argp, n: 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: &range);
936 if (ret < 0)
937 return ret;
938
939 if (copy_to_user(to: argp, from: &range, n: 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(f: 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(to: &args, from: argp, n: sizeof(args)))
971 return -EFAULT;
972 preserve = (args.preserve != 0);
973
974 return ocfs2_reflink_ioctl(inode, oldname: compat_ptr(uptr: args.old_path),
975 newname: compat_ptr(uptr: args.new_path), preserve);
976 case OCFS2_IOC_INFO:
977 if (copy_from_user(to: &info, from: argp, n: sizeof(struct ocfs2_info)))
978 return -EFAULT;
979
980 return ocfs2_info_handle(inode, info: &info, compat_flag: 1);
981 case FITRIM:
982 case OCFS2_IOC_MOVE_EXT:
983 break;
984 default:
985 return -ENOIOCTLCMD;
986 }
987
988 return ocfs2_ioctl(filp: file, cmd, arg);
989}
990#endif
991

source code of linux/fs/ocfs2/ioctl.c