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

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