Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / fs / ocfs2 / ioctl.c
blobbc91072b72196fd335c4b7cbc02ba08cb67254e6
1 /*
2 * linux/fs/ocfs2/ioctl.c
4 * Copyright (C) 2006 Herbert Poetzl
5 * adapted from Remy Card's ext2/ioctl.c
6 */
8 #include <linux/fs.h>
9 #include <linux/mount.h>
10 #include <linux/compat.h>
12 #include <cluster/masklog.h>
14 #include "ocfs2.h"
15 #include "alloc.h"
16 #include "dlmglue.h"
17 #include "file.h"
18 #include "inode.h"
19 #include "journal.h"
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"
31 #include <linux/ext2_fs.h>
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))
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.
43 static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
44 struct ocfs2_info_request __user *req)
46 kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
47 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
50 static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
52 req->ir_flags |= OCFS2_INFO_FL_FILLED;
55 static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
57 req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
60 static inline int o2info_coherent(struct ocfs2_info_request *req)
62 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
65 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
67 int status;
69 status = ocfs2_inode_lock(inode, NULL, 0);
70 if (status < 0) {
71 mlog_errno(status);
72 return status;
74 ocfs2_get_inode_flags(OCFS2_I(inode));
75 *flags = OCFS2_I(inode)->ip_attr;
76 ocfs2_inode_unlock(inode, 0);
78 return status;
81 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
82 unsigned mask)
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;
91 mutex_lock(&inode->i_mutex);
93 status = ocfs2_inode_lock(inode, &bh, 1);
94 if (status < 0) {
95 mlog_errno(status);
96 goto bail;
99 status = -EACCES;
100 if (!inode_owner_or_capable(inode))
101 goto bail_unlock;
103 if (!S_ISDIR(inode->i_mode))
104 flags &= ~OCFS2_DIRSYNC_FL;
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;
113 oldflags = ocfs2_inode->ip_attr;
114 flags = flags & mask;
115 flags |= oldflags & ~mask;
118 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
119 * the relevant capability.
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;
128 ocfs2_inode->ip_attr = flags;
129 ocfs2_set_inode_flags(inode);
131 status = ocfs2_mark_inode_dirty(handle, inode, bh);
132 if (status < 0)
133 mlog_errno(status);
135 ocfs2_commit_trans(osb, handle);
136 bail_unlock:
137 ocfs2_inode_unlock(inode, 1);
138 bail:
139 mutex_unlock(&inode->i_mutex);
141 brelse(bh);
143 return status;
146 int ocfs2_info_handle_blocksize(struct inode *inode,
147 struct ocfs2_info_request __user *req)
149 int status = -EFAULT;
150 struct ocfs2_info_blocksize oib;
152 if (o2info_from_user(oib, req))
153 goto bail;
155 oib.ib_blocksize = inode->i_sb->s_blocksize;
157 o2info_set_request_filled(&oib.ib_req);
159 if (o2info_to_user(oib, req))
160 goto bail;
162 status = 0;
163 bail:
164 if (status)
165 o2info_set_request_error(&oib.ib_req, req);
167 return status;
170 int ocfs2_info_handle_clustersize(struct inode *inode,
171 struct ocfs2_info_request __user *req)
173 int status = -EFAULT;
174 struct ocfs2_info_clustersize oic;
175 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
177 if (o2info_from_user(oic, req))
178 goto bail;
180 oic.ic_clustersize = osb->s_clustersize;
182 o2info_set_request_filled(&oic.ic_req);
184 if (o2info_to_user(oic, req))
185 goto bail;
187 status = 0;
188 bail:
189 if (status)
190 o2info_set_request_error(&oic.ic_req, req);
192 return status;
195 int ocfs2_info_handle_maxslots(struct inode *inode,
196 struct ocfs2_info_request __user *req)
198 int status = -EFAULT;
199 struct ocfs2_info_maxslots oim;
200 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
202 if (o2info_from_user(oim, req))
203 goto bail;
205 oim.im_max_slots = osb->max_slots;
207 o2info_set_request_filled(&oim.im_req);
209 if (o2info_to_user(oim, req))
210 goto bail;
212 status = 0;
213 bail:
214 if (status)
215 o2info_set_request_error(&oim.im_req, req);
217 return status;
220 int ocfs2_info_handle_label(struct inode *inode,
221 struct ocfs2_info_request __user *req)
223 int status = -EFAULT;
224 struct ocfs2_info_label oil;
225 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
227 if (o2info_from_user(oil, req))
228 goto bail;
230 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
232 o2info_set_request_filled(&oil.il_req);
234 if (o2info_to_user(oil, req))
235 goto bail;
237 status = 0;
238 bail:
239 if (status)
240 o2info_set_request_error(&oil.il_req, req);
242 return status;
245 int ocfs2_info_handle_uuid(struct inode *inode,
246 struct ocfs2_info_request __user *req)
248 int status = -EFAULT;
249 struct ocfs2_info_uuid oiu;
250 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
252 if (o2info_from_user(oiu, req))
253 goto bail;
255 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
257 o2info_set_request_filled(&oiu.iu_req);
259 if (o2info_to_user(oiu, req))
260 goto bail;
262 status = 0;
263 bail:
264 if (status)
265 o2info_set_request_error(&oiu.iu_req, req);
267 return status;
270 int ocfs2_info_handle_fs_features(struct inode *inode,
271 struct ocfs2_info_request __user *req)
273 int status = -EFAULT;
274 struct ocfs2_info_fs_features oif;
275 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
277 if (o2info_from_user(oif, req))
278 goto bail;
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;
284 o2info_set_request_filled(&oif.if_req);
286 if (o2info_to_user(oif, req))
287 goto bail;
289 status = 0;
290 bail:
291 if (status)
292 o2info_set_request_error(&oif.if_req, req);
294 return status;
297 int ocfs2_info_handle_journal_size(struct inode *inode,
298 struct ocfs2_info_request __user *req)
300 int status = -EFAULT;
301 struct ocfs2_info_journal_size oij;
302 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
304 if (o2info_from_user(oij, req))
305 goto bail;
307 oij.ij_journal_size = osb->journal->j_inode->i_size;
309 o2info_set_request_filled(&oij.ij_req);
311 if (o2info_to_user(oij, req))
312 goto bail;
314 status = 0;
315 bail:
316 if (status)
317 o2info_set_request_error(&oij.ij_req, req);
319 return status;
322 int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
323 struct inode *inode_alloc, u64 blkno,
324 struct ocfs2_info_freeinode *fi, u32 slot)
326 int status = 0, unlock = 0;
328 struct buffer_head *bh = NULL;
329 struct ocfs2_dinode *dinode_alloc = NULL;
331 if (inode_alloc)
332 mutex_lock(&inode_alloc->i_mutex);
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;
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;
349 dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
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);
357 bail:
358 if (unlock)
359 ocfs2_inode_unlock(inode_alloc, 0);
361 if (inode_alloc)
362 mutex_unlock(&inode_alloc->i_mutex);
364 brelse(bh);
366 return status;
369 int ocfs2_info_handle_freeinode(struct inode *inode,
370 struct ocfs2_info_request __user *req)
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;
380 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
381 if (!oifi) {
382 status = -ENOMEM;
383 mlog_errno(status);
384 goto bail;
387 if (o2info_from_user(*oifi, req))
388 goto bail;
390 oifi->ifi_slotnum = osb->max_slots;
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;
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;
415 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
416 if (status < 0)
417 goto bail;
419 iput(inode_alloc);
420 inode_alloc = NULL;
423 o2info_set_request_filled(&oifi->ifi_req);
425 if (o2info_to_user(*oifi, req))
426 goto bail;
428 status = 0;
429 bail:
430 if (status)
431 o2info_set_request_error(&oifi->ifi_req, req);
433 kfree(oifi);
435 return status;
438 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
439 unsigned int chunksize)
441 int index;
443 index = __ilog2_u32(chunksize);
444 if (index >= OCFS2_INFO_MAX_HIST)
445 index = OCFS2_INFO_MAX_HIST - 1;
447 hist->fc_chunks[index]++;
448 hist->fc_clusters[index] += chunksize;
451 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
452 unsigned int chunksize)
454 if (chunksize > stats->ffs_max)
455 stats->ffs_max = chunksize;
457 if (chunksize < stats->ffs_min)
458 stats->ffs_min = chunksize;
460 stats->ffs_avg += chunksize;
461 stats->ffs_free_chunks_real++;
464 void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
465 unsigned int chunksize)
467 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
468 o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
471 int 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)
478 int status = 0, used;
479 u64 blkno;
481 struct buffer_head *bh = NULL;
482 struct ocfs2_group_desc *bg = NULL;
484 unsigned int max_bits, num_clusters;
485 unsigned int offset = 0, cluster, chunk;
486 unsigned int chunk_free, last_chunksize = 0;
488 if (!le32_to_cpu(rec->c_free))
489 goto bail;
491 do {
492 if (!bg)
493 blkno = le64_to_cpu(rec->c_blkno);
494 else
495 blkno = le64_to_cpu(bg->bg_next_group);
497 if (bh) {
498 brelse(bh);
499 bh = NULL;
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);
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;
516 bg = (struct ocfs2_group_desc *)bh->b_data;
518 if (!le16_to_cpu(bg->bg_free_bits_count))
519 continue;
521 max_bits = le16_to_cpu(bg->bg_bits);
522 offset = 0;
524 for (chunk = 0; chunk < chunks_in_group; chunk++) {
526 * last chunk may be not an entire one.
528 if ((offset + ffg->iff_chunksize) > max_bits)
529 num_clusters = max_bits - offset;
530 else
531 num_clusters = ffg->iff_chunksize;
533 chunk_free = 0;
534 for (cluster = 0; cluster < num_clusters; cluster++) {
535 used = ocfs2_test_bit(offset,
536 (unsigned long *)bg->bg_bitmap);
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.
542 if (!used) {
543 last_chunksize++;
544 chunk_free++;
547 if (used && last_chunksize) {
548 ocfs2_info_update_ffg(ffg,
549 last_chunksize);
550 last_chunksize = 0;
553 offset++;
556 if (chunk_free == ffg->iff_chunksize)
557 ffg->iff_ffs.ffs_free_chunks++;
561 * need to update the info for last free chunk.
563 if (last_chunksize)
564 ocfs2_info_update_ffg(ffg, last_chunksize);
566 } while (le64_to_cpu(bg->bg_next_group));
568 bail:
569 brelse(bh);
571 return status;
574 int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
575 struct inode *gb_inode, u64 blkno,
576 struct ocfs2_info_freefrag *ffg)
578 u32 chunks_in_group;
579 int status = 0, unlock = 0, i;
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;
586 if (gb_inode)
587 mutex_lock(&gb_inode->i_mutex);
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;
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;
604 gb_dinode = (struct ocfs2_dinode *)bh->b_data;
605 cl = &(gb_dinode->id2.i_chain);
608 * Chunksize(in) clusters from userspace should be
609 * less than clusters in a group.
611 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
612 status = -EINVAL;
613 goto bail;
616 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
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);
624 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
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;
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);
639 bail:
640 if (unlock)
641 ocfs2_inode_unlock(gb_inode, 0);
643 if (gb_inode)
644 mutex_unlock(&gb_inode->i_mutex);
646 if (gb_inode)
647 iput(gb_inode);
649 brelse(bh);
651 return status;
654 int ocfs2_info_handle_freefrag(struct inode *inode,
655 struct ocfs2_info_request __user *req)
657 u64 blkno = -1;
658 char namebuf[40];
659 int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
661 struct ocfs2_info_freefrag *oiff;
662 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
663 struct inode *gb_inode = NULL;
665 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
666 if (!oiff) {
667 status = -ENOMEM;
668 mlog_errno(status);
669 goto bail;
672 if (o2info_from_user(*oiff, req))
673 goto bail;
675 * chunksize from userspace should be power of 2.
677 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
678 (!oiff->iff_chunksize)) {
679 status = -EINVAL;
680 goto bail;
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;
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;
704 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
705 if (status < 0)
706 goto bail;
708 o2info_set_request_filled(&oiff->iff_req);
710 if (o2info_to_user(*oiff, req))
711 goto bail;
713 status = 0;
714 bail:
715 if (status)
716 o2info_set_request_error(&oiff->iff_req, req);
718 kfree(oiff);
720 return status;
723 int ocfs2_info_handle_unknown(struct inode *inode,
724 struct ocfs2_info_request __user *req)
726 int status = -EFAULT;
727 struct ocfs2_info_request oir;
729 if (o2info_from_user(oir, req))
730 goto bail;
732 o2info_clear_request_filled(&oir);
734 if (o2info_to_user(oir, req))
735 goto bail;
737 status = 0;
738 bail:
739 if (status)
740 o2info_set_request_error(&oir, req);
742 return status;
746 * Validate and distinguish OCFS2_IOC_INFO requests.
748 * - validate the magic number.
749 * - distinguish different requests.
750 * - validate size of different requests.
752 int ocfs2_info_handle_request(struct inode *inode,
753 struct ocfs2_info_request __user *req)
755 int status = -EFAULT;
756 struct ocfs2_info_request oir;
758 if (o2info_from_user(oir, req))
759 goto bail;
761 status = -EINVAL;
762 if (oir.ir_magic != OCFS2_INFO_MAGIC)
763 goto bail;
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;
807 bail:
808 return status;
811 int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
812 u64 *req_addr, int compat_flag)
814 int status = -EFAULT;
815 u64 __user *bp = NULL;
817 if (compat_flag) {
818 #ifdef CONFIG_COMPAT
820 * pointer bp stores the base address of a pointers array,
821 * which collects all addresses of separate request.
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);
830 if (o2info_from_user(*req_addr, bp + idx))
831 goto bail;
833 status = 0;
834 bail:
835 return status;
839 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
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.
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.
849 int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
850 int compat_flag)
852 int i, status = 0;
853 u64 req_addr;
854 struct ocfs2_info_request __user *reqp;
856 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
857 (!info->oi_requests)) {
858 status = -EINVAL;
859 goto bail;
862 for (i = 0; i < info->oi_count; i++) {
864 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
865 if (status)
866 break;
868 reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
869 if (!reqp) {
870 status = -EINVAL;
871 goto bail;
874 status = ocfs2_info_handle_request(inode, reqp);
875 if (status)
876 break;
879 bail:
880 return status;
883 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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;
896 switch (cmd) {
897 case OCFS2_IOC_GETFLAGS:
898 status = ocfs2_get_inode_attr(inode, &flags);
899 if (status < 0)
900 return status;
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;
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;
922 return ocfs2_change_file_space(filp, cmd, &sr);
923 case OCFS2_IOC_GROUP_EXTEND:
924 if (!capable(CAP_SYS_RESOURCE))
925 return -EPERM;
927 if (get_user(new_clusters, (int __user *)arg))
928 return -EFAULT;
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;
936 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
937 return -EFAULT;
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);
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;
954 return ocfs2_info_handle(inode, &info, 0);
955 case FITRIM:
957 struct super_block *sb = inode->i_sb;
958 struct fstrim_range range;
959 int ret = 0;
961 if (!capable(CAP_SYS_ADMIN))
962 return -EPERM;
964 if (copy_from_user(&range, (struct fstrim_range *)arg,
965 sizeof(range)))
966 return -EFAULT;
968 ret = ocfs2_trim_fs(sb, &range);
969 if (ret < 0)
970 return ret;
972 if (copy_to_user((struct fstrim_range *)arg, &range,
973 sizeof(range)))
974 return -EFAULT;
976 return 0;
978 case OCFS2_IOC_MOVE_EXT:
979 return ocfs2_ioctl_move_extents(filp, (void __user *)arg);
980 default:
981 return -ENOTTY;
985 #ifdef CONFIG_COMPAT
986 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
988 bool preserve;
989 struct reflink_arguments args;
990 struct inode *inode = file->f_path.dentry->d_inode;
991 struct ocfs2_info info;
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);
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;
1022 return ocfs2_info_handle(inode, &info, 1);
1023 case OCFS2_IOC_MOVE_EXT:
1024 break;
1025 default:
1026 return -ENOIOCTLCMD;
1029 return ocfs2_ioctl(file, cmd, arg);
1031 #endif