Root/fs/ocfs2/ioctl.c

1/*
2 * linux/fs/ocfs2/ioctl.c
3 *
4 * Copyright (C) 2006 Herbert Poetzl
5 * adapted from Remy Card's ext2/ioctl.c
6 */
7
8#include <linux/fs.h>
9#include <linux/mount.h>
10#include <linux/compat.h>
11
12#include <cluster/masklog.h>
13
14#include "ocfs2.h"
15#include "alloc.h"
16#include "dlmglue.h"
17#include "file.h"
18#include "inode.h"
19#include "journal.h"
20
21#include "ocfs2_fs.h"
22#include "ioctl.h"
23#include "resize.h"
24#include "refcounttree.h"
25#include "sysfile.h"
26#include "dir.h"
27#include "buffer_head_io.h"
28#include "suballoc.h"
29#include "move_extents.h"
30
31#include <linux/ext2_fs.h>
32
33#define o2info_from_user(a, b) \
34        copy_from_user(&(a), (b), sizeof(a))
35#define o2info_to_user(a, b) \
36        copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
37
38/*
39 * This call is void because we are already reporting an error that may
40 * be -EFAULT. The error will be returned from the ioctl(2) call. It's
41 * just a best-effort to tell userspace that this request caused the error.
42 */
43static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
44                    struct ocfs2_info_request __user *req)
45{
46    kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
47    (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
48}
49
50static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
51{
52    req->ir_flags |= OCFS2_INFO_FL_FILLED;
53}
54
55static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
56{
57    req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
58}
59
60static inline int o2info_coherent(struct ocfs2_info_request *req)
61{
62    return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
63}
64
65static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
66{
67    int status;
68
69    status = ocfs2_inode_lock(inode, NULL, 0);
70    if (status < 0) {
71        mlog_errno(status);
72        return status;
73    }
74    ocfs2_get_inode_flags(OCFS2_I(inode));
75    *flags = OCFS2_I(inode)->ip_attr;
76    ocfs2_inode_unlock(inode, 0);
77
78    return status;
79}
80
81static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
82                unsigned mask)
83{
84    struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
85    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
86    handle_t *handle = NULL;
87    struct buffer_head *bh = NULL;
88    unsigned oldflags;
89    int status;
90
91    mutex_lock(&inode->i_mutex);
92
93    status = ocfs2_inode_lock(inode, &bh, 1);
94    if (status < 0) {
95        mlog_errno(status);
96        goto bail;
97    }
98
99    status = -EACCES;
100    if (!inode_owner_or_capable(inode))
101        goto bail_unlock;
102
103    if (!S_ISDIR(inode->i_mode))
104        flags &= ~OCFS2_DIRSYNC_FL;
105
106    handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
107    if (IS_ERR(handle)) {
108        status = PTR_ERR(handle);
109        mlog_errno(status);
110        goto bail_unlock;
111    }
112
113    oldflags = ocfs2_inode->ip_attr;
114    flags = flags & mask;
115    flags |= oldflags & ~mask;
116
117    /*
118     * The IMMUTABLE and APPEND_ONLY flags can only be changed by
119     * the relevant capability.
120     */
121    status = -EPERM;
122    if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
123        (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
124        if (!capable(CAP_LINUX_IMMUTABLE))
125            goto bail_unlock;
126    }
127
128    ocfs2_inode->ip_attr = flags;
129    ocfs2_set_inode_flags(inode);
130
131    status = ocfs2_mark_inode_dirty(handle, inode, bh);
132    if (status < 0)
133        mlog_errno(status);
134
135    ocfs2_commit_trans(osb, handle);
136bail_unlock:
137    ocfs2_inode_unlock(inode, 1);
138bail:
139    mutex_unlock(&inode->i_mutex);
140
141    brelse(bh);
142
143    return status;
144}
145
146int ocfs2_info_handle_blocksize(struct inode *inode,
147                struct ocfs2_info_request __user *req)
148{
149    int status = -EFAULT;
150    struct ocfs2_info_blocksize oib;
151
152    if (o2info_from_user(oib, req))
153        goto bail;
154
155    oib.ib_blocksize = inode->i_sb->s_blocksize;
156
157    o2info_set_request_filled(&oib.ib_req);
158
159    if (o2info_to_user(oib, req))
160        goto bail;
161
162    status = 0;
163bail:
164    if (status)
165        o2info_set_request_error(&oib.ib_req, req);
166
167    return status;
168}
169
170int ocfs2_info_handle_clustersize(struct inode *inode,
171                  struct ocfs2_info_request __user *req)
172{
173    int status = -EFAULT;
174    struct ocfs2_info_clustersize oic;
175    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
176
177    if (o2info_from_user(oic, req))
178        goto bail;
179
180    oic.ic_clustersize = osb->s_clustersize;
181
182    o2info_set_request_filled(&oic.ic_req);
183
184    if (o2info_to_user(oic, req))
185        goto bail;
186
187    status = 0;
188bail:
189    if (status)
190        o2info_set_request_error(&oic.ic_req, req);
191
192    return status;
193}
194
195int ocfs2_info_handle_maxslots(struct inode *inode,
196                   struct ocfs2_info_request __user *req)
197{
198    int status = -EFAULT;
199    struct ocfs2_info_maxslots oim;
200    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
201
202    if (o2info_from_user(oim, req))
203        goto bail;
204
205    oim.im_max_slots = osb->max_slots;
206
207    o2info_set_request_filled(&oim.im_req);
208
209    if (o2info_to_user(oim, req))
210        goto bail;
211
212    status = 0;
213bail:
214    if (status)
215        o2info_set_request_error(&oim.im_req, req);
216
217    return status;
218}
219
220int ocfs2_info_handle_label(struct inode *inode,
221                struct ocfs2_info_request __user *req)
222{
223    int status = -EFAULT;
224    struct ocfs2_info_label oil;
225    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
226
227    if (o2info_from_user(oil, req))
228        goto bail;
229
230    memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
231
232    o2info_set_request_filled(&oil.il_req);
233
234    if (o2info_to_user(oil, req))
235        goto bail;
236
237    status = 0;
238bail:
239    if (status)
240        o2info_set_request_error(&oil.il_req, req);
241
242    return status;
243}
244
245int ocfs2_info_handle_uuid(struct inode *inode,
246               struct ocfs2_info_request __user *req)
247{
248    int status = -EFAULT;
249    struct ocfs2_info_uuid oiu;
250    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
251
252    if (o2info_from_user(oiu, req))
253        goto bail;
254
255    memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
256
257    o2info_set_request_filled(&oiu.iu_req);
258
259    if (o2info_to_user(oiu, req))
260        goto bail;
261
262    status = 0;
263bail:
264    if (status)
265        o2info_set_request_error(&oiu.iu_req, req);
266
267    return status;
268}
269
270int ocfs2_info_handle_fs_features(struct inode *inode,
271                  struct ocfs2_info_request __user *req)
272{
273    int status = -EFAULT;
274    struct ocfs2_info_fs_features oif;
275    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
276
277    if (o2info_from_user(oif, req))
278        goto bail;
279
280    oif.if_compat_features = osb->s_feature_compat;
281    oif.if_incompat_features = osb->s_feature_incompat;
282    oif.if_ro_compat_features = osb->s_feature_ro_compat;
283
284    o2info_set_request_filled(&oif.if_req);
285
286    if (o2info_to_user(oif, req))
287        goto bail;
288
289    status = 0;
290bail:
291    if (status)
292        o2info_set_request_error(&oif.if_req, req);
293
294    return status;
295}
296
297int ocfs2_info_handle_journal_size(struct inode *inode,
298                   struct ocfs2_info_request __user *req)
299{
300    int status = -EFAULT;
301    struct ocfs2_info_journal_size oij;
302    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
303
304    if (o2info_from_user(oij, req))
305        goto bail;
306
307    oij.ij_journal_size = osb->journal->j_inode->i_size;
308
309    o2info_set_request_filled(&oij.ij_req);
310
311    if (o2info_to_user(oij, req))
312        goto bail;
313
314    status = 0;
315bail:
316    if (status)
317        o2info_set_request_error(&oij.ij_req, req);
318
319    return status;
320}
321
322int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
323                struct inode *inode_alloc, u64 blkno,
324                struct ocfs2_info_freeinode *fi, u32 slot)
325{
326    int status = 0, unlock = 0;
327
328    struct buffer_head *bh = NULL;
329    struct ocfs2_dinode *dinode_alloc = NULL;
330
331    if (inode_alloc)
332        mutex_lock(&inode_alloc->i_mutex);
333
334    if (o2info_coherent(&fi->ifi_req)) {
335        status = ocfs2_inode_lock(inode_alloc, &bh, 0);
336        if (status < 0) {
337            mlog_errno(status);
338            goto bail;
339        }
340        unlock = 1;
341    } else {
342        status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
343        if (status < 0) {
344            mlog_errno(status);
345            goto bail;
346        }
347    }
348
349    dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
350
351    fi->ifi_stat[slot].lfi_total =
352        le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
353    fi->ifi_stat[slot].lfi_free =
354        le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
355        le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
356
357bail:
358    if (unlock)
359        ocfs2_inode_unlock(inode_alloc, 0);
360
361    if (inode_alloc)
362        mutex_unlock(&inode_alloc->i_mutex);
363
364    brelse(bh);
365
366    return status;
367}
368
369int ocfs2_info_handle_freeinode(struct inode *inode,
370                struct ocfs2_info_request __user *req)
371{
372    u32 i;
373    u64 blkno = -1;
374    char namebuf[40];
375    int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
376    struct ocfs2_info_freeinode *oifi = NULL;
377    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
378    struct inode *inode_alloc = NULL;
379
380    oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
381    if (!oifi) {
382        status = -ENOMEM;
383        mlog_errno(status);
384        goto bail;
385    }
386
387    if (o2info_from_user(*oifi, req))
388        goto bail;
389
390    oifi->ifi_slotnum = osb->max_slots;
391
392    for (i = 0; i < oifi->ifi_slotnum; i++) {
393        if (o2info_coherent(&oifi->ifi_req)) {
394            inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
395            if (!inode_alloc) {
396                mlog(ML_ERROR, "unable to get alloc inode in "
397                    "slot %u\n", i);
398                status = -EIO;
399                goto bail;
400            }
401        } else {
402            ocfs2_sprintf_system_inode_name(namebuf,
403                            sizeof(namebuf),
404                            type, i);
405            status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
406                                namebuf,
407                                strlen(namebuf),
408                                &blkno);
409            if (status < 0) {
410                status = -ENOENT;
411                goto bail;
412            }
413        }
414
415        status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
416        if (status < 0)
417            goto bail;
418
419        iput(inode_alloc);
420        inode_alloc = NULL;
421    }
422
423    o2info_set_request_filled(&oifi->ifi_req);
424
425    if (o2info_to_user(*oifi, req))
426        goto bail;
427
428    status = 0;
429bail:
430    if (status)
431        o2info_set_request_error(&oifi->ifi_req, req);
432
433    kfree(oifi);
434
435    return status;
436}
437
438static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
439                   unsigned int chunksize)
440{
441    int index;
442
443    index = __ilog2_u32(chunksize);
444    if (index >= OCFS2_INFO_MAX_HIST)
445        index = OCFS2_INFO_MAX_HIST - 1;
446
447    hist->fc_chunks[index]++;
448    hist->fc_clusters[index] += chunksize;
449}
450
451static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
452                   unsigned int chunksize)
453{
454    if (chunksize > stats->ffs_max)
455        stats->ffs_max = chunksize;
456
457    if (chunksize < stats->ffs_min)
458        stats->ffs_min = chunksize;
459
460    stats->ffs_avg += chunksize;
461    stats->ffs_free_chunks_real++;
462}
463
464void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
465               unsigned int chunksize)
466{
467    o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
468    o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
469}
470
471int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
472                   struct inode *gb_inode,
473                   struct ocfs2_dinode *gb_dinode,
474                   struct ocfs2_chain_rec *rec,
475                   struct ocfs2_info_freefrag *ffg,
476                   u32 chunks_in_group)
477{
478    int status = 0, used;
479    u64 blkno;
480
481    struct buffer_head *bh = NULL;
482    struct ocfs2_group_desc *bg = NULL;
483
484    unsigned int max_bits, num_clusters;
485    unsigned int offset = 0, cluster, chunk;
486    unsigned int chunk_free, last_chunksize = 0;
487
488    if (!le32_to_cpu(rec->c_free))
489        goto bail;
490
491    do {
492        if (!bg)
493            blkno = le64_to_cpu(rec->c_blkno);
494        else
495            blkno = le64_to_cpu(bg->bg_next_group);
496
497        if (bh) {
498            brelse(bh);
499            bh = NULL;
500        }
501
502        if (o2info_coherent(&ffg->iff_req))
503            status = ocfs2_read_group_descriptor(gb_inode,
504                                 gb_dinode,
505                                 blkno, &bh);
506        else
507            status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
508
509        if (status < 0) {
510            mlog(ML_ERROR, "Can't read the group descriptor # "
511                 "%llu from device.", (unsigned long long)blkno);
512            status = -EIO;
513            goto bail;
514        }
515
516        bg = (struct ocfs2_group_desc *)bh->b_data;
517
518        if (!le16_to_cpu(bg->bg_free_bits_count))
519            continue;
520
521        max_bits = le16_to_cpu(bg->bg_bits);
522        offset = 0;
523
524        for (chunk = 0; chunk < chunks_in_group; chunk++) {
525            /*
526             * last chunk may be not an entire one.
527             */
528            if ((offset + ffg->iff_chunksize) > max_bits)
529                num_clusters = max_bits - offset;
530            else
531                num_clusters = ffg->iff_chunksize;
532
533            chunk_free = 0;
534            for (cluster = 0; cluster < num_clusters; cluster++) {
535                used = ocfs2_test_bit(offset,
536                        (unsigned long *)bg->bg_bitmap);
537                /*
538                 * - chunk_free counts free clusters in #N chunk.
539                 * - last_chunksize records the size(in) clusters
540                 * for the last real free chunk being counted.
541                 */
542                if (!used) {
543                    last_chunksize++;
544                    chunk_free++;
545                }
546
547                if (used && last_chunksize) {
548                    ocfs2_info_update_ffg(ffg,
549                                  last_chunksize);
550                    last_chunksize = 0;
551                }
552
553                offset++;
554            }
555
556            if (chunk_free == ffg->iff_chunksize)
557                ffg->iff_ffs.ffs_free_chunks++;
558        }
559
560        /*
561         * need to update the info for last free chunk.
562         */
563        if (last_chunksize)
564            ocfs2_info_update_ffg(ffg, last_chunksize);
565
566    } while (le64_to_cpu(bg->bg_next_group));
567
568bail:
569    brelse(bh);
570
571    return status;
572}
573
574int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
575                    struct inode *gb_inode, u64 blkno,
576                    struct ocfs2_info_freefrag *ffg)
577{
578    u32 chunks_in_group;
579    int status = 0, unlock = 0, i;
580
581    struct buffer_head *bh = NULL;
582    struct ocfs2_chain_list *cl = NULL;
583    struct ocfs2_chain_rec *rec = NULL;
584    struct ocfs2_dinode *gb_dinode = NULL;
585
586    if (gb_inode)
587        mutex_lock(&gb_inode->i_mutex);
588
589    if (o2info_coherent(&ffg->iff_req)) {
590        status = ocfs2_inode_lock(gb_inode, &bh, 0);
591        if (status < 0) {
592            mlog_errno(status);
593            goto bail;
594        }
595        unlock = 1;
596    } else {
597        status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
598        if (status < 0) {
599            mlog_errno(status);
600            goto bail;
601        }
602    }
603
604    gb_dinode = (struct ocfs2_dinode *)bh->b_data;
605    cl = &(gb_dinode->id2.i_chain);
606
607    /*
608     * Chunksize(in) clusters from userspace should be
609     * less than clusters in a group.
610     */
611    if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
612        status = -EINVAL;
613        goto bail;
614    }
615
616    memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
617
618    ffg->iff_ffs.ffs_min = ~0U;
619    ffg->iff_ffs.ffs_clusters =
620            le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
621    ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
622            le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
623
624    chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
625
626    for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
627        rec = &(cl->cl_recs[i]);
628        status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
629                            gb_dinode,
630                            rec, ffg,
631                            chunks_in_group);
632        if (status)
633            goto bail;
634    }
635
636    if (ffg->iff_ffs.ffs_free_chunks_real)
637        ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
638                    ffg->iff_ffs.ffs_free_chunks_real);
639bail:
640    if (unlock)
641        ocfs2_inode_unlock(gb_inode, 0);
642
643    if (gb_inode)
644        mutex_unlock(&gb_inode->i_mutex);
645
646    if (gb_inode)
647        iput(gb_inode);
648
649    brelse(bh);
650
651    return status;
652}
653
654int ocfs2_info_handle_freefrag(struct inode *inode,
655                   struct ocfs2_info_request __user *req)
656{
657    u64 blkno = -1;
658    char namebuf[40];
659    int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
660
661    struct ocfs2_info_freefrag *oiff;
662    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
663    struct inode *gb_inode = NULL;
664
665    oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
666    if (!oiff) {
667        status = -ENOMEM;
668        mlog_errno(status);
669        goto bail;
670    }
671
672    if (o2info_from_user(*oiff, req))
673        goto bail;
674    /*
675     * chunksize from userspace should be power of 2.
676     */
677    if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
678        (!oiff->iff_chunksize)) {
679        status = -EINVAL;
680        goto bail;
681    }
682
683    if (o2info_coherent(&oiff->iff_req)) {
684        gb_inode = ocfs2_get_system_file_inode(osb, type,
685                               OCFS2_INVALID_SLOT);
686        if (!gb_inode) {
687            mlog(ML_ERROR, "unable to get global_bitmap inode\n");
688            status = -EIO;
689            goto bail;
690        }
691    } else {
692        ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
693                        OCFS2_INVALID_SLOT);
694        status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
695                            namebuf,
696                            strlen(namebuf),
697                            &blkno);
698        if (status < 0) {
699            status = -ENOENT;
700            goto bail;
701        }
702    }
703
704    status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
705    if (status < 0)
706        goto bail;
707
708    o2info_set_request_filled(&oiff->iff_req);
709
710    if (o2info_to_user(*oiff, req))
711        goto bail;
712
713    status = 0;
714bail:
715    if (status)
716        o2info_set_request_error(&oiff->iff_req, req);
717
718    kfree(oiff);
719
720    return status;
721}
722
723int ocfs2_info_handle_unknown(struct inode *inode,
724                  struct ocfs2_info_request __user *req)
725{
726    int status = -EFAULT;
727    struct ocfs2_info_request oir;
728
729    if (o2info_from_user(oir, req))
730        goto bail;
731
732    o2info_clear_request_filled(&oir);
733
734    if (o2info_to_user(oir, req))
735        goto bail;
736
737    status = 0;
738bail:
739    if (status)
740        o2info_set_request_error(&oir, req);
741
742    return status;
743}
744
745/*
746 * Validate and distinguish OCFS2_IOC_INFO requests.
747 *
748 * - validate the magic number.
749 * - distinguish different requests.
750 * - validate size of different requests.
751 */
752int ocfs2_info_handle_request(struct inode *inode,
753                  struct ocfs2_info_request __user *req)
754{
755    int status = -EFAULT;
756    struct ocfs2_info_request oir;
757
758    if (o2info_from_user(oir, req))
759        goto bail;
760
761    status = -EINVAL;
762    if (oir.ir_magic != OCFS2_INFO_MAGIC)
763        goto bail;
764
765    switch (oir.ir_code) {
766    case OCFS2_INFO_BLOCKSIZE:
767        if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
768            status = ocfs2_info_handle_blocksize(inode, req);
769        break;
770    case OCFS2_INFO_CLUSTERSIZE:
771        if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
772            status = ocfs2_info_handle_clustersize(inode, req);
773        break;
774    case OCFS2_INFO_MAXSLOTS:
775        if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
776            status = ocfs2_info_handle_maxslots(inode, req);
777        break;
778    case OCFS2_INFO_LABEL:
779        if (oir.ir_size == sizeof(struct ocfs2_info_label))
780            status = ocfs2_info_handle_label(inode, req);
781        break;
782    case OCFS2_INFO_UUID:
783        if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
784            status = ocfs2_info_handle_uuid(inode, req);
785        break;
786    case OCFS2_INFO_FS_FEATURES:
787        if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
788            status = ocfs2_info_handle_fs_features(inode, req);
789        break;
790    case OCFS2_INFO_JOURNAL_SIZE:
791        if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
792            status = ocfs2_info_handle_journal_size(inode, req);
793        break;
794    case OCFS2_INFO_FREEINODE:
795        if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
796            status = ocfs2_info_handle_freeinode(inode, req);
797        break;
798    case OCFS2_INFO_FREEFRAG:
799        if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
800            status = ocfs2_info_handle_freefrag(inode, req);
801        break;
802    default:
803        status = ocfs2_info_handle_unknown(inode, req);
804        break;
805    }
806
807bail:
808    return status;
809}
810
811int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
812              u64 *req_addr, int compat_flag)
813{
814    int status = -EFAULT;
815    u64 __user *bp = NULL;
816
817    if (compat_flag) {
818#ifdef CONFIG_COMPAT
819        /*
820         * pointer bp stores the base address of a pointers array,
821         * which collects all addresses of separate request.
822         */
823        bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
824#else
825        BUG();
826#endif
827    } else
828        bp = (u64 __user *)(unsigned long)(info->oi_requests);
829
830    if (o2info_from_user(*req_addr, bp + idx))
831        goto bail;
832
833    status = 0;
834bail:
835    return status;
836}
837
838/*
839 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
840 *
841 * ocfs2_info_handle() recevies a large info aggregation, grab and
842 * validate the request count from header, then break it into small
843 * pieces, later specific handlers can handle them one by one.
844 *
845 * Idea here is to make each separate request small enough to ensure
846 * a better backward&forward compatibility, since a small piece of
847 * request will be less likely to be broken if disk layout get changed.
848 */
849int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
850              int compat_flag)
851{
852    int i, status = 0;
853    u64 req_addr;
854    struct ocfs2_info_request __user *reqp;
855
856    if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
857        (!info->oi_requests)) {
858        status = -EINVAL;
859        goto bail;
860    }
861
862    for (i = 0; i < info->oi_count; i++) {
863
864        status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
865        if (status)
866            break;
867
868        reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
869        if (!reqp) {
870            status = -EINVAL;
871            goto bail;
872        }
873
874        status = ocfs2_info_handle_request(inode, reqp);
875        if (status)
876            break;
877    }
878
879bail:
880    return status;
881}
882
883long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
884{
885    struct inode *inode = filp->f_path.dentry->d_inode;
886    unsigned int flags;
887    int new_clusters;
888    int status;
889    struct ocfs2_space_resv sr;
890    struct ocfs2_new_group_input input;
891    struct reflink_arguments args;
892    const char *old_path, *new_path;
893    bool preserve;
894    struct ocfs2_info info;
895
896    switch (cmd) {
897    case OCFS2_IOC_GETFLAGS:
898        status = ocfs2_get_inode_attr(inode, &flags);
899        if (status < 0)
900            return status;
901
902        flags &= OCFS2_FL_VISIBLE;
903        return put_user(flags, (int __user *) arg);
904    case OCFS2_IOC_SETFLAGS:
905        if (get_user(flags, (int __user *) arg))
906            return -EFAULT;
907
908        status = mnt_want_write(filp->f_path.mnt);
909        if (status)
910            return status;
911        status = ocfs2_set_inode_attr(inode, flags,
912            OCFS2_FL_MODIFIABLE);
913        mnt_drop_write(filp->f_path.mnt);
914        return status;
915    case OCFS2_IOC_RESVSP:
916    case OCFS2_IOC_RESVSP64:
917    case OCFS2_IOC_UNRESVSP:
918    case OCFS2_IOC_UNRESVSP64:
919        if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
920            return -EFAULT;
921
922        return ocfs2_change_file_space(filp, cmd, &sr);
923    case OCFS2_IOC_GROUP_EXTEND:
924        if (!capable(CAP_SYS_RESOURCE))
925            return -EPERM;
926
927        if (get_user(new_clusters, (int __user *)arg))
928            return -EFAULT;
929
930        return ocfs2_group_extend(inode, new_clusters);
931    case OCFS2_IOC_GROUP_ADD:
932    case OCFS2_IOC_GROUP_ADD64:
933        if (!capable(CAP_SYS_RESOURCE))
934            return -EPERM;
935
936        if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
937            return -EFAULT;
938
939        return ocfs2_group_add(inode, &input);
940    case OCFS2_IOC_REFLINK:
941        if (copy_from_user(&args, (struct reflink_arguments *)arg,
942                   sizeof(args)))
943            return -EFAULT;
944        old_path = (const char *)(unsigned long)args.old_path;
945        new_path = (const char *)(unsigned long)args.new_path;
946        preserve = (args.preserve != 0);
947
948        return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
949    case OCFS2_IOC_INFO:
950        if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
951                   sizeof(struct ocfs2_info)))
952            return -EFAULT;
953
954        return ocfs2_info_handle(inode, &info, 0);
955    case FITRIM:
956    {
957        struct super_block *sb = inode->i_sb;
958        struct fstrim_range range;
959        int ret = 0;
960
961        if (!capable(CAP_SYS_ADMIN))
962            return -EPERM;
963
964        if (copy_from_user(&range, (struct fstrim_range *)arg,
965            sizeof(range)))
966            return -EFAULT;
967
968        ret = ocfs2_trim_fs(sb, &range);
969        if (ret < 0)
970            return ret;
971
972        if (copy_to_user((struct fstrim_range *)arg, &range,
973            sizeof(range)))
974            return -EFAULT;
975
976        return 0;
977    }
978    case OCFS2_IOC_MOVE_EXT:
979        return ocfs2_ioctl_move_extents(filp, (void __user *)arg);
980    default:
981        return -ENOTTY;
982    }
983}
984
985#ifdef CONFIG_COMPAT
986long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
987{
988    bool preserve;
989    struct reflink_arguments args;
990    struct inode *inode = file->f_path.dentry->d_inode;
991    struct ocfs2_info info;
992
993    switch (cmd) {
994    case OCFS2_IOC32_GETFLAGS:
995        cmd = OCFS2_IOC_GETFLAGS;
996        break;
997    case OCFS2_IOC32_SETFLAGS:
998        cmd = OCFS2_IOC_SETFLAGS;
999        break;
1000    case OCFS2_IOC_RESVSP:
1001    case OCFS2_IOC_RESVSP64:
1002    case OCFS2_IOC_UNRESVSP:
1003    case OCFS2_IOC_UNRESVSP64:
1004    case OCFS2_IOC_GROUP_EXTEND:
1005    case OCFS2_IOC_GROUP_ADD:
1006    case OCFS2_IOC_GROUP_ADD64:
1007    case FITRIM:
1008        break;
1009    case OCFS2_IOC_REFLINK:
1010        if (copy_from_user(&args, (struct reflink_arguments *)arg,
1011                   sizeof(args)))
1012            return -EFAULT;
1013        preserve = (args.preserve != 0);
1014
1015        return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
1016                       compat_ptr(args.new_path), preserve);
1017    case OCFS2_IOC_INFO:
1018        if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
1019                   sizeof(struct ocfs2_info)))
1020            return -EFAULT;
1021
1022        return ocfs2_info_handle(inode, &info, 1);
1023    case OCFS2_IOC_MOVE_EXT:
1024        break;
1025    default:
1026        return -ENOIOCTLCMD;
1027    }
1028
1029    return ocfs2_ioctl(file, cmd, arg);
1030}
1031#endif
1032

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