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switch a bunch of places to mnt_want_write_file()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ocfs2 / ioctl.c
CommitLineData
ca4d147e
HP		 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>
34e6c59a 10#include <linux/compat.h>
ca4d147e 11
ca4d147e
HP		 12#include <cluster/masklog.h>
13
14#include "ocfs2.h"
15#include "alloc.h"
16#include "dlmglue.h"
b2580103 17#include "file.h"
ca4d147e
HP		 18#include "inode.h"
19#include "journal.h"
20
21#include "ocfs2_fs.h"
2d562518 22#include "ioctl.h"
d659072f 23#include "resize.h"
bd50873d 24#include "refcounttree.h"
3e5db17d
TY		 25#include "sysfile.h"
26#include "dir.h"
27#include "buffer_head_io.h"
d24a10b9 28#include "suballoc.h"
53069d4e 29#include "move_extents.h"
2d562518 30
ca4d147e
HP		 31#include <linux/ext2_fs.h>
32
ddee5cdb
TY		 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 */
8aa1fa36 43static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
ddee5cdb
TY		 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
8aa1fa36 50static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
1936a267
TY		 51{
52 req->ir_flags |= OCFS2_INFO_FL_FILLED;
53}
54
8aa1fa36 55static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
1936a267
TY		 56{
57 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
58}
59
3e5db17d
TY		 60static inline int o2info_coherent(struct ocfs2_info_request *req)
61{
62 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
63}
1936a267 64
ca4d147e
HP		 65static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
66{
67 int status;
68
e63aecb6 69 status = ocfs2_inode_lock(inode, NULL, 0);
ca4d147e
HP		 70 if (status < 0) {
71 mlog_errno(status);
72 return status;
73 }
6e4b0d56 74 ocfs2_get_inode_flags(OCFS2_I(inode));
ca4d147e 75 *flags = OCFS2_I(inode)->ip_attr;
e63aecb6 76 ocfs2_inode_unlock(inode, 0);
ca4d147e 77
ca4d147e
HP		 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);
1fabe148 86 handle_t *handle = NULL;
ca4d147e
HP		 87 struct buffer_head *bh = NULL;
88 unsigned oldflags;
89 int status;
90
91 mutex_lock(&inode->i_mutex);
92
e63aecb6 93 status = ocfs2_inode_lock(inode, &bh, 1);
ca4d147e
HP		 94 if (status < 0) {
95 mlog_errno(status);
96 goto bail;
97 }
98
ca4d147e 99 status = -EACCES;
2e149670 100 if (!inode_owner_or_capable(inode))
ca4d147e
HP		 101 goto bail_unlock;
102
103 if (!S_ISDIR(inode->i_mode))
104 flags &= ~OCFS2_DIRSYNC_FL;
105
65eff9cc 106 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
ca4d147e
HP		 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))
b8a0ae57 125 goto bail_commit;
ca4d147e
HP		 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
b8a0ae57 135bail_commit:
02dc1af4 136 ocfs2_commit_trans(osb, handle);
ca4d147e 137bail_unlock:
e63aecb6 138 ocfs2_inode_unlock(inode, 1);
ca4d147e
HP		 139bail:
140 mutex_unlock(&inode->i_mutex);
141
a81cb88b 142 brelse(bh);
ca4d147e 143
ca4d147e
HP		 144 return status;
145}
146
ddee5cdb
TY		 147int ocfs2_info_handle_blocksize(struct inode *inode,
148 struct ocfs2_info_request __user *req)
149{
150 int status = -EFAULT;
151 struct ocfs2_info_blocksize oib;
152
153 if (o2info_from_user(oib, req))
154 goto bail;
155
156 oib.ib_blocksize = inode->i_sb->s_blocksize;
1936a267 157
8aa1fa36 158 o2info_set_request_filled(&oib.ib_req);
ddee5cdb
TY		 159
160 if (o2info_to_user(oib, req))
161 goto bail;
162
163 status = 0;
164bail:
165 if (status)
8aa1fa36 166 o2info_set_request_error(&oib.ib_req, req);
ddee5cdb
TY		 167
168 return status;
169}
170
171int ocfs2_info_handle_clustersize(struct inode *inode,
172 struct ocfs2_info_request __user *req)
173{
174 int status = -EFAULT;
175 struct ocfs2_info_clustersize oic;
176 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
177
178 if (o2info_from_user(oic, req))
179 goto bail;
180
181 oic.ic_clustersize = osb->s_clustersize;
1936a267 182
8aa1fa36 183 o2info_set_request_filled(&oic.ic_req);
ddee5cdb
TY		 184
185 if (o2info_to_user(oic, req))
186 goto bail;
187
188 status = 0;
189bail:
190 if (status)
8aa1fa36 191 o2info_set_request_error(&oic.ic_req, req);
ddee5cdb
TY		 192
193 return status;
194}
195
196int ocfs2_info_handle_maxslots(struct inode *inode,
197 struct ocfs2_info_request __user *req)
198{
199 int status = -EFAULT;
200 struct ocfs2_info_maxslots oim;
201 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
202
203 if (o2info_from_user(oim, req))
204 goto bail;
205
206 oim.im_max_slots = osb->max_slots;
1936a267 207
8aa1fa36 208 o2info_set_request_filled(&oim.im_req);
ddee5cdb
TY		 209
210 if (o2info_to_user(oim, req))
211 goto bail;
212
213 status = 0;
214bail:
215 if (status)
8aa1fa36 216 o2info_set_request_error(&oim.im_req, req);
ddee5cdb
TY		 217
218 return status;
219}
220
221int ocfs2_info_handle_label(struct inode *inode,
222 struct ocfs2_info_request __user *req)
223{
224 int status = -EFAULT;
225 struct ocfs2_info_label oil;
226 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
227
228 if (o2info_from_user(oil, req))
229 goto bail;
230
231 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
1936a267 232
8aa1fa36 233 o2info_set_request_filled(&oil.il_req);
ddee5cdb
TY		 234
235 if (o2info_to_user(oil, req))
236 goto bail;
237
238 status = 0;
239bail:
240 if (status)
8aa1fa36 241 o2info_set_request_error(&oil.il_req, req);
ddee5cdb
TY		 242
243 return status;
244}
245
246int ocfs2_info_handle_uuid(struct inode *inode,
247 struct ocfs2_info_request __user *req)
248{
249 int status = -EFAULT;
250 struct ocfs2_info_uuid oiu;
251 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
252
253 if (o2info_from_user(oiu, req))
254 goto bail;
255
256 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
1936a267 257
8aa1fa36 258 o2info_set_request_filled(&oiu.iu_req);
ddee5cdb
TY		 259
260 if (o2info_to_user(oiu, req))
261 goto bail;
262
263 status = 0;
264bail:
265 if (status)
8aa1fa36 266 o2info_set_request_error(&oiu.iu_req, req);
ddee5cdb
TY		 267
268 return status;
269}
270
271int ocfs2_info_handle_fs_features(struct inode *inode,
272 struct ocfs2_info_request __user *req)
273{
274 int status = -EFAULT;
275 struct ocfs2_info_fs_features oif;
276 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
277
278 if (o2info_from_user(oif, req))
279 goto bail;
280
281 oif.if_compat_features = osb->s_feature_compat;
282 oif.if_incompat_features = osb->s_feature_incompat;
283 oif.if_ro_compat_features = osb->s_feature_ro_compat;
1936a267 284
8aa1fa36 285 o2info_set_request_filled(&oif.if_req);
ddee5cdb
TY		 286
287 if (o2info_to_user(oif, req))
288 goto bail;
289
290 status = 0;
291bail:
292 if (status)
8aa1fa36 293 o2info_set_request_error(&oif.if_req, req);
ddee5cdb
TY		 294
295 return status;
296}
297
298int ocfs2_info_handle_journal_size(struct inode *inode,
299 struct ocfs2_info_request __user *req)
300{
301 int status = -EFAULT;
302 struct ocfs2_info_journal_size oij;
303 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
304
305 if (o2info_from_user(oij, req))
306 goto bail;
307
308 oij.ij_journal_size = osb->journal->j_inode->i_size;
309
8aa1fa36 310 o2info_set_request_filled(&oij.ij_req);
ddee5cdb
TY		 311
312 if (o2info_to_user(oij, req))
313 goto bail;
314
315 status = 0;
316bail:
317 if (status)
8aa1fa36 318 o2info_set_request_error(&oij.ij_req, req);
ddee5cdb
TY		 319
320 return status;
321}
322
3e5db17d
TY		 323int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
324 struct inode *inode_alloc, u64 blkno,
325 struct ocfs2_info_freeinode *fi, u32 slot)
326{
327 int status = 0, unlock = 0;
328
329 struct buffer_head *bh = NULL;
330 struct ocfs2_dinode *dinode_alloc = NULL;
331
332 if (inode_alloc)
333 mutex_lock(&inode_alloc->i_mutex);
334
335 if (o2info_coherent(&fi->ifi_req)) {
336 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
337 if (status < 0) {
338 mlog_errno(status);
339 goto bail;
340 }
341 unlock = 1;
342 } else {
343 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
344 if (status < 0) {
345 mlog_errno(status);
346 goto bail;
347 }
348 }
349
350 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
351
352 fi->ifi_stat[slot].lfi_total =
353 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
354 fi->ifi_stat[slot].lfi_free =
355 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
356 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
357
358bail:
359 if (unlock)
360 ocfs2_inode_unlock(inode_alloc, 0);
361
362 if (inode_alloc)
363 mutex_unlock(&inode_alloc->i_mutex);
364
365 brelse(bh);
366
367 return status;
368}
369
370int ocfs2_info_handle_freeinode(struct inode *inode,
371 struct ocfs2_info_request __user *req)
372{
373 u32 i;
374 u64 blkno = -1;
375 char namebuf[40];
376 int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
377 struct ocfs2_info_freeinode *oifi = NULL;
378 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
379 struct inode *inode_alloc = NULL;
380
381 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
382 if (!oifi) {
383 status = -ENOMEM;
384 mlog_errno(status);
87f0d5c8 385 goto out_err;
3e5db17d
TY		 386 }
387
388 if (o2info_from_user(*oifi, req))
389 goto bail;
390
391 oifi->ifi_slotnum = osb->max_slots;
392
393 for (i = 0; i < oifi->ifi_slotnum; i++) {
394 if (o2info_coherent(&oifi->ifi_req)) {
395 inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
396 if (!inode_alloc) {
397 mlog(ML_ERROR, "unable to get alloc inode in "
398 "slot %u\n", i);
399 status = -EIO;
400 goto bail;
401 }
402 } else {
403 ocfs2_sprintf_system_inode_name(namebuf,
404 sizeof(namebuf),
405 type, i);
406 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
407 namebuf,
408 strlen(namebuf),
409 &blkno);
410 if (status < 0) {
411 status = -ENOENT;
412 goto bail;
413 }
414 }
415
416 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
417 if (status < 0)
418 goto bail;
419
420 iput(inode_alloc);
421 inode_alloc = NULL;
422 }
423
424 o2info_set_request_filled(&oifi->ifi_req);
425
426 if (o2info_to_user(*oifi, req))
427 goto bail;
428
429 status = 0;
430bail:
431 if (status)
432 o2info_set_request_error(&oifi->ifi_req, req);
433
434 kfree(oifi);
87f0d5c8 435out_err:
3e5db17d
TY		 436 return status;
437}
438
d24a10b9
TY		 439static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
440 unsigned int chunksize)
441{
442 int index;
443
444 index = __ilog2_u32(chunksize);
445 if (index >= OCFS2_INFO_MAX_HIST)
446 index = OCFS2_INFO_MAX_HIST - 1;
447
448 hist->fc_chunks[index]++;
449 hist->fc_clusters[index] += chunksize;
450}
451
452static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
453 unsigned int chunksize)
454{
455 if (chunksize > stats->ffs_max)
456 stats->ffs_max = chunksize;
457
458 if (chunksize < stats->ffs_min)
459 stats->ffs_min = chunksize;
460
461 stats->ffs_avg += chunksize;
462 stats->ffs_free_chunks_real++;
463}
464
465void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
466 unsigned int chunksize)
467{
468 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
469 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
470}
471
472int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
473 struct inode *gb_inode,
474 struct ocfs2_dinode *gb_dinode,
475 struct ocfs2_chain_rec *rec,
476 struct ocfs2_info_freefrag *ffg,
477 u32 chunks_in_group)
478{
479 int status = 0, used;
480 u64 blkno;
481
482 struct buffer_head *bh = NULL;
483 struct ocfs2_group_desc *bg = NULL;
484
485 unsigned int max_bits, num_clusters;
486 unsigned int offset = 0, cluster, chunk;
487 unsigned int chunk_free, last_chunksize = 0;
488
489 if (!le32_to_cpu(rec->c_free))
490 goto bail;
491
492 do {
493 if (!bg)
494 blkno = le64_to_cpu(rec->c_blkno);
495 else
496 blkno = le64_to_cpu(bg->bg_next_group);
497
498 if (bh) {
499 brelse(bh);
500 bh = NULL;
501 }
502
503 if (o2info_coherent(&ffg->iff_req))
504 status = ocfs2_read_group_descriptor(gb_inode,
505 gb_dinode,
506 blkno, &bh);
507 else
508 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
509
510 if (status < 0) {
511 mlog(ML_ERROR, "Can't read the group descriptor # "
512 "%llu from device.", (unsigned long long)blkno);
513 status = -EIO;
514 goto bail;
515 }
516
517 bg = (struct ocfs2_group_desc *)bh->b_data;
518
519 if (!le16_to_cpu(bg->bg_free_bits_count))
520 continue;
521
522 max_bits = le16_to_cpu(bg->bg_bits);
523 offset = 0;
524
525 for (chunk = 0; chunk < chunks_in_group; chunk++) {
526 /*
527 * last chunk may be not an entire one.
528 */
529 if ((offset + ffg->iff_chunksize) > max_bits)
530 num_clusters = max_bits - offset;
531 else
532 num_clusters = ffg->iff_chunksize;
533
534 chunk_free = 0;
535 for (cluster = 0; cluster < num_clusters; cluster++) {
536 used = ocfs2_test_bit(offset,
537 (unsigned long *)bg->bg_bitmap);
538 /*
539 * - chunk_free counts free clusters in #N chunk.
540 * - last_chunksize records the size(in) clusters
541 * for the last real free chunk being counted.
542 */
543 if (!used) {
544 last_chunksize++;
545 chunk_free++;
546 }
547
548 if (used && last_chunksize) {
549 ocfs2_info_update_ffg(ffg,
550 last_chunksize);
551 last_chunksize = 0;
552 }
553
554 offset++;
555 }
556
557 if (chunk_free == ffg->iff_chunksize)
558 ffg->iff_ffs.ffs_free_chunks++;
559 }
560
561 /*
562 * need to update the info for last free chunk.
563 */
564 if (last_chunksize)
565 ocfs2_info_update_ffg(ffg, last_chunksize);
566
567 } while (le64_to_cpu(bg->bg_next_group));
568
569bail:
570 brelse(bh);
571
572 return status;
573}
574
575int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
576 struct inode *gb_inode, u64 blkno,
577 struct ocfs2_info_freefrag *ffg)
578{
579 u32 chunks_in_group;
580 int status = 0, unlock = 0, i;
581
582 struct buffer_head *bh = NULL;
583 struct ocfs2_chain_list *cl = NULL;
584 struct ocfs2_chain_rec *rec = NULL;
585 struct ocfs2_dinode *gb_dinode = NULL;
586
587 if (gb_inode)
588 mutex_lock(&gb_inode->i_mutex);
589
590 if (o2info_coherent(&ffg->iff_req)) {
591 status = ocfs2_inode_lock(gb_inode, &bh, 0);
592 if (status < 0) {
593 mlog_errno(status);
594 goto bail;
595 }
596 unlock = 1;
597 } else {
598 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
599 if (status < 0) {
600 mlog_errno(status);
601 goto bail;
602 }
603 }
604
605 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
606 cl = &(gb_dinode->id2.i_chain);
607
608 /*
609 * Chunksize(in) clusters from userspace should be
610 * less than clusters in a group.
611 */
612 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
613 status = -EINVAL;
614 goto bail;
615 }
616
617 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
618
619 ffg->iff_ffs.ffs_min = ~0U;
620 ffg->iff_ffs.ffs_clusters =
621 le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
622 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
623 le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
624
625 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
626
627 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
628 rec = &(cl->cl_recs[i]);
629 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
630 gb_dinode,
631 rec, ffg,
632 chunks_in_group);
633 if (status)
634 goto bail;
635 }
636
637 if (ffg->iff_ffs.ffs_free_chunks_real)
638 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
639 ffg->iff_ffs.ffs_free_chunks_real);
640bail:
641 if (unlock)
642 ocfs2_inode_unlock(gb_inode, 0);
643
644 if (gb_inode)
645 mutex_unlock(&gb_inode->i_mutex);
646
647 if (gb_inode)
648 iput(gb_inode);
649
650 brelse(bh);
651
652 return status;
653}
654
655int ocfs2_info_handle_freefrag(struct inode *inode,
656 struct ocfs2_info_request __user *req)
657{
658 u64 blkno = -1;
659 char namebuf[40];
660 int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
661
662 struct ocfs2_info_freefrag *oiff;
663 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
664 struct inode *gb_inode = NULL;
665
666 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
667 if (!oiff) {
668 status = -ENOMEM;
669 mlog_errno(status);
87f0d5c8 670 goto out_err;
d24a10b9
TY		 671 }
672
673 if (o2info_from_user(*oiff, req))
674 goto bail;
675 /*
676 * chunksize from userspace should be power of 2.
677 */
678 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
679 (!oiff->iff_chunksize)) {
680 status = -EINVAL;
681 goto bail;
682 }
683
684 if (o2info_coherent(&oiff->iff_req)) {
685 gb_inode = ocfs2_get_system_file_inode(osb, type,
686 OCFS2_INVALID_SLOT);
687 if (!gb_inode) {
688 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
689 status = -EIO;
690 goto bail;
691 }
692 } else {
693 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
694 OCFS2_INVALID_SLOT);
695 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
696 namebuf,
697 strlen(namebuf),
698 &blkno);
699 if (status < 0) {
700 status = -ENOENT;
701 goto bail;
702 }
703 }
704
705 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
706 if (status < 0)
707 goto bail;
708
709 o2info_set_request_filled(&oiff->iff_req);
710
711 if (o2info_to_user(*oiff, req))
712 goto bail;
713
714 status = 0;
715bail:
716 if (status)
717 o2info_set_request_error(&oiff->iff_req, req);
718
719 kfree(oiff);
87f0d5c8 720out_err:
ddee5cdb
TY		 721 return status;
722}
723
724int ocfs2_info_handle_unknown(struct inode *inode,
725 struct ocfs2_info_request __user *req)
726{
727 int status = -EFAULT;
728 struct ocfs2_info_request oir;
729
730 if (o2info_from_user(oir, req))
731 goto bail;
732
8aa1fa36 733 o2info_clear_request_filled(&oir);
ddee5cdb
TY		 734
735 if (o2info_to_user(oir, req))
736 goto bail;
737
738 status = 0;
739bail:
740 if (status)
8aa1fa36 741 o2info_set_request_error(&oir, req);
ddee5cdb
TY		 742
743 return status;
744}
745
746/*
747 * Validate and distinguish OCFS2_IOC_INFO requests.
748 *
749 * - validate the magic number.
750 * - distinguish different requests.
751 * - validate size of different requests.
752 */
753int ocfs2_info_handle_request(struct inode *inode,
754 struct ocfs2_info_request __user *req)
755{
756 int status = -EFAULT;
757 struct ocfs2_info_request oir;
758
759 if (o2info_from_user(oir, req))
760 goto bail;
761
762 status = -EINVAL;
763 if (oir.ir_magic != OCFS2_INFO_MAGIC)
764 goto bail;
765
766 switch (oir.ir_code) {
767 case OCFS2_INFO_BLOCKSIZE:
768 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
769 status = ocfs2_info_handle_blocksize(inode, req);
770 break;
771 case OCFS2_INFO_CLUSTERSIZE:
772 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
773 status = ocfs2_info_handle_clustersize(inode, req);
774 break;
775 case OCFS2_INFO_MAXSLOTS:
776 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
777 status = ocfs2_info_handle_maxslots(inode, req);
778 break;
779 case OCFS2_INFO_LABEL:
780 if (oir.ir_size == sizeof(struct ocfs2_info_label))
781 status = ocfs2_info_handle_label(inode, req);
782 break;
783 case OCFS2_INFO_UUID:
784 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
785 status = ocfs2_info_handle_uuid(inode, req);
786 break;
787 case OCFS2_INFO_FS_FEATURES:
788 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
789 status = ocfs2_info_handle_fs_features(inode, req);
790 break;
791 case OCFS2_INFO_JOURNAL_SIZE:
792 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
793 status = ocfs2_info_handle_journal_size(inode, req);
794 break;
3e5db17d
TY		 795 case OCFS2_INFO_FREEINODE:
796 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
797 status = ocfs2_info_handle_freeinode(inode, req);
798 break;
d24a10b9
TY		 799 case OCFS2_INFO_FREEFRAG:
800 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
801 status = ocfs2_info_handle_freefrag(inode, req);
802 break;
ddee5cdb
TY		 803 default:
804 status = ocfs2_info_handle_unknown(inode, req);
805 break;
806 }
807
808bail:
809 return status;
810}
811
812int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
813 u64 *req_addr, int compat_flag)
814{
815 int status = -EFAULT;
816 u64 __user *bp = NULL;
817
818 if (compat_flag) {
819#ifdef CONFIG_COMPAT
820 /*
821 * pointer bp stores the base address of a pointers array,
822 * which collects all addresses of separate request.
823 */
824 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
825#else
826 BUG();
827#endif
828 } else
829 bp = (u64 __user *)(unsigned long)(info->oi_requests);
830
831 if (o2info_from_user(*req_addr, bp + idx))
832 goto bail;
833
834 status = 0;
835bail:
836 return status;
837}
838
839/*
840 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
841 *
842 * ocfs2_info_handle() recevies a large info aggregation, grab and
843 * validate the request count from header, then break it into small
844 * pieces, later specific handlers can handle them one by one.
845 *
846 * Idea here is to make each separate request small enough to ensure
847 * a better backward&forward compatibility, since a small piece of
848 * request will be less likely to be broken if disk layout get changed.
849 */
850int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
851 int compat_flag)
852{
853 int i, status = 0;
854 u64 req_addr;
855 struct ocfs2_info_request __user *reqp;
856
857 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
858 (!info->oi_requests)) {
859 status = -EINVAL;
860 goto bail;
861 }
862
863 for (i = 0; i < info->oi_count; i++) {
864
865 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
866 if (status)
867 break;
868
869 reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
870 if (!reqp) {
871 status = -EINVAL;
872 goto bail;
873 }
874
875 status = ocfs2_info_handle_request(inode, reqp);
876 if (status)
877 break;
878 }
879
880bail:
881 return status;
882}
883
c9ec1488 884long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ca4d147e 885{
c9ec1488 886 struct inode *inode = filp->f_path.dentry->d_inode;
ca4d147e 887 unsigned int flags;
d659072f 888 int new_clusters;
ca4d147e 889 int status;
b2580103 890 struct ocfs2_space_resv sr;
7909f2bf 891 struct ocfs2_new_group_input input;
bd50873d
TM		 892 struct reflink_arguments args;
893 const char *old_path, *new_path;
894 bool preserve;
ddee5cdb 895 struct ocfs2_info info;
ca4d147e
HP		 896
897 switch (cmd) {
898 case OCFS2_IOC_GETFLAGS:
899 status = ocfs2_get_inode_attr(inode, &flags);
900 if (status < 0)
901 return status;
902
903 flags &= OCFS2_FL_VISIBLE;
904 return put_user(flags, (int __user *) arg);
905 case OCFS2_IOC_SETFLAGS:
906 if (get_user(flags, (int __user *) arg))
907 return -EFAULT;
908
a561be71 909 status = mnt_want_write_file(filp);
42a74f20
DH		 910 if (status)
911 return status;
912 status = ocfs2_set_inode_attr(inode, flags,
ca4d147e 913 OCFS2_FL_MODIFIABLE);
42a74f20
DH		 914 mnt_drop_write(filp->f_path.mnt);
915 return status;
b2580103
MF		 916 case OCFS2_IOC_RESVSP:
917 case OCFS2_IOC_RESVSP64:
918 case OCFS2_IOC_UNRESVSP:
919 case OCFS2_IOC_UNRESVSP64:
920 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
921 return -EFAULT;
922
923 return ocfs2_change_file_space(filp, cmd, &sr);
d659072f 924 case OCFS2_IOC_GROUP_EXTEND:
0957f007
MF		 925 if (!capable(CAP_SYS_RESOURCE))
926 return -EPERM;
927
d659072f
TM		 928 if (get_user(new_clusters, (int __user *)arg))
929 return -EFAULT;
930
931 return ocfs2_group_extend(inode, new_clusters);
7909f2bf
TM		 932 case OCFS2_IOC_GROUP_ADD:
933 case OCFS2_IOC_GROUP_ADD64:
0957f007
MF		 934 if (!capable(CAP_SYS_RESOURCE))
935 return -EPERM;
936
7909f2bf
TM		 937 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
938 return -EFAULT;
939
940 return ocfs2_group_add(inode, &input);
bd50873d
TM		 941 case OCFS2_IOC_REFLINK:
942 if (copy_from_user(&args, (struct reflink_arguments *)arg,
943 sizeof(args)))
944 return -EFAULT;
945 old_path = (const char *)(unsigned long)args.old_path;
946 new_path = (const char *)(unsigned long)args.new_path;
947 preserve = (args.preserve != 0);
948
949 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
ddee5cdb
TY		 950 case OCFS2_IOC_INFO:
951 if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
952 sizeof(struct ocfs2_info)))
953 return -EFAULT;
954
955 return ocfs2_info_handle(inode, &info, 0);
55e67872
TM		 956 case FITRIM:
957 {
958 struct super_block *sb = inode->i_sb;
959 struct fstrim_range range;
960 int ret = 0;
961
962 if (!capable(CAP_SYS_ADMIN))
963 return -EPERM;
964
965 if (copy_from_user(&range, (struct fstrim_range *)arg,
966 sizeof(range)))
967 return -EFAULT;
968
969 ret = ocfs2_trim_fs(sb, &range);
970 if (ret < 0)
971 return ret;
972
973 if (copy_to_user((struct fstrim_range *)arg, &range,
974 sizeof(range)))
975 return -EFAULT;
976
977 return 0;
978 }
53069d4e
TY		 979 case OCFS2_IOC_MOVE_EXT:
980 return ocfs2_ioctl_move_extents(filp, (void __user *)arg);
ca4d147e
HP		 981 default:
982 return -ENOTTY;
983 }
984}
985
586d232b
MF		 986#ifdef CONFIG_COMPAT
987long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
988{
34e6c59a
TM		 989 bool preserve;
990 struct reflink_arguments args;
991 struct inode *inode = file->f_path.dentry->d_inode;
ddee5cdb 992 struct ocfs2_info info;
34e6c59a 993
586d232b
MF		 994 switch (cmd) {
995 case OCFS2_IOC32_GETFLAGS:
996 cmd = OCFS2_IOC_GETFLAGS;
997 break;
998 case OCFS2_IOC32_SETFLAGS:
999 cmd = OCFS2_IOC_SETFLAGS;
1000 break;
b2580103
MF		 1001 case OCFS2_IOC_RESVSP:
1002 case OCFS2_IOC_RESVSP64:
1003 case OCFS2_IOC_UNRESVSP:
1004 case OCFS2_IOC_UNRESVSP64:
d659072f 1005 case OCFS2_IOC_GROUP_EXTEND:
7909f2bf
TM		 1006 case OCFS2_IOC_GROUP_ADD:
1007 case OCFS2_IOC_GROUP_ADD64:
55e67872 1008 case FITRIM:
b2580103 1009 break;
34e6c59a
TM		 1010 case OCFS2_IOC_REFLINK:
1011 if (copy_from_user(&args, (struct reflink_arguments *)arg,
1012 sizeof(args)))
1013 return -EFAULT;
1014 preserve = (args.preserve != 0);
1015
1016 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
1017 compat_ptr(args.new_path), preserve);
ddee5cdb
TY		 1018 case OCFS2_IOC_INFO:
1019 if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
1020 sizeof(struct ocfs2_info)))
1021 return -EFAULT;
1022
1023 return ocfs2_info_handle(inode, &info, 1);
53069d4e
TY		 1024 case OCFS2_IOC_MOVE_EXT:
1025 break;
586d232b
MF		 1026 default:
1027 return -ENOIOCTLCMD;
1028 }
1029
c9ec1488 1030 return ocfs2_ioctl(file, cmd, arg);
586d232b
MF		 1031}
1032#endif
kernel source for telekom puls (alcatel/mediatek)