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TOMOYO Linux Cross Reference
Linux/fs/nilfs2/ioctl.c

Version: ~ [ linux-5.8-rc3 ] ~ [ linux-5.7.5 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.48 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.129 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.185 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.228 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.228 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * ioctl.c - NILFS ioctl operations.
  3  *
  4  * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 19  *
 20  * Written by Koji Sato <koji@osrg.net>.
 21  */
 22 
 23 #include <linux/fs.h>
 24 #include <linux/wait.h>
 25 #include <linux/smp_lock.h>     /* lock_kernel(), unlock_kernel() */
 26 #include <linux/capability.h>   /* capable() */
 27 #include <linux/uaccess.h>      /* copy_from_user(), copy_to_user() */
 28 #include <linux/vmalloc.h>
 29 #include <linux/nilfs2_fs.h>
 30 #include "nilfs.h"
 31 #include "segment.h"
 32 #include "bmap.h"
 33 #include "cpfile.h"
 34 #include "sufile.h"
 35 #include "dat.h"
 36 
 37 
 38 static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
 39                                  struct nilfs_argv *argv, int dir,
 40                                  ssize_t (*dofunc)(struct the_nilfs *,
 41                                                    __u64 *, int,
 42                                                    void *, size_t, size_t))
 43 {
 44         void *buf;
 45         void __user *base = (void __user *)(unsigned long)argv->v_base;
 46         size_t maxmembs, total, n;
 47         ssize_t nr;
 48         int ret, i;
 49         __u64 pos, ppos;
 50 
 51         if (argv->v_nmembs == 0)
 52                 return 0;
 53 
 54         if (argv->v_size > PAGE_SIZE)
 55                 return -EINVAL;
 56 
 57         buf = (void *)__get_free_pages(GFP_NOFS, 0);
 58         if (unlikely(!buf))
 59                 return -ENOMEM;
 60         maxmembs = PAGE_SIZE / argv->v_size;
 61 
 62         ret = 0;
 63         total = 0;
 64         pos = argv->v_index;
 65         for (i = 0; i < argv->v_nmembs; i += n) {
 66                 n = (argv->v_nmembs - i < maxmembs) ?
 67                         argv->v_nmembs - i : maxmembs;
 68                 if ((dir & _IOC_WRITE) &&
 69                     copy_from_user(buf, base + argv->v_size * i,
 70                                    argv->v_size * n)) {
 71                         ret = -EFAULT;
 72                         break;
 73                 }
 74                 ppos = pos;
 75                 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
 76                                n);
 77                 if (nr < 0) {
 78                         ret = nr;
 79                         break;
 80                 }
 81                 if ((dir & _IOC_READ) &&
 82                     copy_to_user(base + argv->v_size * i, buf,
 83                                  argv->v_size * nr)) {
 84                         ret = -EFAULT;
 85                         break;
 86                 }
 87                 total += nr;
 88                 if ((size_t)nr < n)
 89                         break;
 90                 if (pos == ppos)
 91                         pos += n;
 92         }
 93         argv->v_nmembs = total;
 94 
 95         free_pages((unsigned long)buf, 0);
 96         return ret;
 97 }
 98 
 99 static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
100                                      unsigned int cmd, void __user *argp)
101 {
102         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
103         struct inode *cpfile = nilfs->ns_cpfile;
104         struct nilfs_transaction_info ti;
105         struct nilfs_cpmode cpmode;
106         int ret;
107 
108         if (!capable(CAP_SYS_ADMIN))
109                 return -EPERM;
110         if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
111                 return -EFAULT;
112 
113         mutex_lock(&nilfs->ns_mount_mutex);
114         nilfs_transaction_begin(inode->i_sb, &ti, 0);
115         ret = nilfs_cpfile_change_cpmode(
116                 cpfile, cpmode.cm_cno, cpmode.cm_mode);
117         if (unlikely(ret < 0)) {
118                 nilfs_transaction_abort(inode->i_sb);
119                 mutex_unlock(&nilfs->ns_mount_mutex);
120                 return ret;
121         }
122         nilfs_transaction_commit(inode->i_sb); /* never fails */
123         mutex_unlock(&nilfs->ns_mount_mutex);
124         return ret;
125 }
126 
127 static int
128 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
129                               unsigned int cmd, void __user *argp)
130 {
131         struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
132         struct nilfs_transaction_info ti;
133         __u64 cno;
134         int ret;
135 
136         if (!capable(CAP_SYS_ADMIN))
137                 return -EPERM;
138         if (copy_from_user(&cno, argp, sizeof(cno)))
139                 return -EFAULT;
140 
141         nilfs_transaction_begin(inode->i_sb, &ti, 0);
142         ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
143         if (unlikely(ret < 0)) {
144                 nilfs_transaction_abort(inode->i_sb);
145                 return ret;
146         }
147         nilfs_transaction_commit(inode->i_sb); /* never fails */
148         return ret;
149 }
150 
151 static ssize_t
152 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
153                           void *buf, size_t size, size_t nmembs)
154 {
155         int ret;
156 
157         down_read(&nilfs->ns_segctor_sem);
158         ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
159                                       size, nmembs);
160         up_read(&nilfs->ns_segctor_sem);
161         return ret;
162 }
163 
164 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
165                                   unsigned int cmd, void __user *argp)
166 {
167         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
168         struct nilfs_cpstat cpstat;
169         int ret;
170 
171         down_read(&nilfs->ns_segctor_sem);
172         ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
173         up_read(&nilfs->ns_segctor_sem);
174         if (ret < 0)
175                 return ret;
176 
177         if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
178                 ret = -EFAULT;
179         return ret;
180 }
181 
182 static ssize_t
183 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
184                           void *buf, size_t size, size_t nmembs)
185 {
186         int ret;
187 
188         down_read(&nilfs->ns_segctor_sem);
189         ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
190                                       nmembs);
191         up_read(&nilfs->ns_segctor_sem);
192         return ret;
193 }
194 
195 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
196                                   unsigned int cmd, void __user *argp)
197 {
198         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
199         struct nilfs_sustat sustat;
200         int ret;
201 
202         down_read(&nilfs->ns_segctor_sem);
203         ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
204         up_read(&nilfs->ns_segctor_sem);
205         if (ret < 0)
206                 return ret;
207 
208         if (copy_to_user(argp, &sustat, sizeof(sustat)))
209                 ret = -EFAULT;
210         return ret;
211 }
212 
213 static ssize_t
214 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
215                          void *buf, size_t size, size_t nmembs)
216 {
217         int ret;
218 
219         down_read(&nilfs->ns_segctor_sem);
220         ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs);
221         up_read(&nilfs->ns_segctor_sem);
222         return ret;
223 }
224 
225 static ssize_t
226 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
227                           void *buf, size_t size, size_t nmembs)
228 {
229         struct inode *dat = nilfs_dat_inode(nilfs);
230         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
231         struct nilfs_bdesc *bdescs = buf;
232         int ret, i;
233 
234         down_read(&nilfs->ns_segctor_sem);
235         for (i = 0; i < nmembs; i++) {
236                 ret = nilfs_bmap_lookup_at_level(bmap,
237                                                  bdescs[i].bd_offset,
238                                                  bdescs[i].bd_level + 1,
239                                                  &bdescs[i].bd_blocknr);
240                 if (ret < 0) {
241                         if (ret != -ENOENT) {
242                                 up_read(&nilfs->ns_segctor_sem);
243                                 return ret;
244                         }
245                         bdescs[i].bd_blocknr = 0;
246                 }
247         }
248         up_read(&nilfs->ns_segctor_sem);
249         return nmembs;
250 }
251 
252 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
253                                   unsigned int cmd, void __user *argp)
254 {
255         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
256         struct nilfs_argv argv;
257         int ret;
258 
259         if (copy_from_user(&argv, argp, sizeof(argv)))
260                 return -EFAULT;
261 
262         if (argv.v_size != sizeof(struct nilfs_bdesc))
263                 return -EINVAL;
264 
265         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
266                                     nilfs_ioctl_do_get_bdescs);
267         if (ret < 0)
268                 return ret;
269 
270         if (copy_to_user(argp, &argv, sizeof(argv)))
271                 ret = -EFAULT;
272         return ret;
273 }
274 
275 static int nilfs_ioctl_move_inode_block(struct inode *inode,
276                                         struct nilfs_vdesc *vdesc,
277                                         struct list_head *buffers)
278 {
279         struct buffer_head *bh;
280         int ret;
281 
282         if (vdesc->vd_flags == 0)
283                 ret = nilfs_gccache_submit_read_data(
284                         inode, vdesc->vd_offset, vdesc->vd_blocknr,
285                         vdesc->vd_vblocknr, &bh);
286         else
287                 ret = nilfs_gccache_submit_read_node(
288                         inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
289 
290         if (unlikely(ret < 0)) {
291                 if (ret == -ENOENT)
292                         printk(KERN_CRIT
293                                "%s: invalid virtual block address (%s): "
294                                "ino=%llu, cno=%llu, offset=%llu, "
295                                "blocknr=%llu, vblocknr=%llu\n",
296                                __func__, vdesc->vd_flags ? "node" : "data",
297                                (unsigned long long)vdesc->vd_ino,
298                                (unsigned long long)vdesc->vd_cno,
299                                (unsigned long long)vdesc->vd_offset,
300                                (unsigned long long)vdesc->vd_blocknr,
301                                (unsigned long long)vdesc->vd_vblocknr);
302                 return ret;
303         }
304         if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
305                 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
306                        "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
307                        __func__, vdesc->vd_flags ? "node" : "data",
308                        (unsigned long long)vdesc->vd_ino,
309                        (unsigned long long)vdesc->vd_cno,
310                        (unsigned long long)vdesc->vd_offset,
311                        (unsigned long long)vdesc->vd_blocknr,
312                        (unsigned long long)vdesc->vd_vblocknr);
313                 brelse(bh);
314                 return -EEXIST;
315         }
316         list_add_tail(&bh->b_assoc_buffers, buffers);
317         return 0;
318 }
319 
320 static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
321                                    struct nilfs_argv *argv, void *buf)
322 {
323         size_t nmembs = argv->v_nmembs;
324         struct inode *inode;
325         struct nilfs_vdesc *vdesc;
326         struct buffer_head *bh, *n;
327         LIST_HEAD(buffers);
328         ino_t ino;
329         __u64 cno;
330         int i, ret;
331 
332         for (i = 0, vdesc = buf; i < nmembs; ) {
333                 ino = vdesc->vd_ino;
334                 cno = vdesc->vd_cno;
335                 inode = nilfs_gc_iget(nilfs, ino, cno);
336                 if (unlikely(inode == NULL)) {
337                         ret = -ENOMEM;
338                         goto failed;
339                 }
340                 do {
341                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
342                                                            &buffers);
343                         if (unlikely(ret < 0))
344                                 goto failed;
345                         vdesc++;
346                 } while (++i < nmembs &&
347                          vdesc->vd_ino == ino && vdesc->vd_cno == cno);
348         }
349 
350         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
351                 ret = nilfs_gccache_wait_and_mark_dirty(bh);
352                 if (unlikely(ret < 0)) {
353                         WARN_ON(ret == -EEXIST);
354                         goto failed;
355                 }
356                 list_del_init(&bh->b_assoc_buffers);
357                 brelse(bh);
358         }
359         return nmembs;
360 
361  failed:
362         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
363                 list_del_init(&bh->b_assoc_buffers);
364                 brelse(bh);
365         }
366         return ret;
367 }
368 
369 static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
370                                           struct nilfs_argv *argv, void *buf)
371 {
372         size_t nmembs = argv->v_nmembs;
373         struct inode *cpfile = nilfs->ns_cpfile;
374         struct nilfs_period *periods = buf;
375         int ret, i;
376 
377         for (i = 0; i < nmembs; i++) {
378                 ret = nilfs_cpfile_delete_checkpoints(
379                         cpfile, periods[i].p_start, periods[i].p_end);
380                 if (ret < 0)
381                         return ret;
382         }
383         return nmembs;
384 }
385 
386 static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
387                                       struct nilfs_argv *argv, void *buf)
388 {
389         size_t nmembs = argv->v_nmembs;
390         int ret;
391 
392         ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
393 
394         return (ret < 0) ? ret : nmembs;
395 }
396 
397 static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
398                                          struct nilfs_argv *argv, void *buf)
399 {
400         size_t nmembs = argv->v_nmembs;
401         struct inode *dat = nilfs_dat_inode(nilfs);
402         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
403         struct nilfs_bdesc *bdescs = buf;
404         int ret, i;
405 
406         for (i = 0; i < nmembs; i++) {
407                 /* XXX: use macro or inline func to check liveness */
408                 ret = nilfs_bmap_lookup_at_level(bmap,
409                                                  bdescs[i].bd_offset,
410                                                  bdescs[i].bd_level + 1,
411                                                  &bdescs[i].bd_blocknr);
412                 if (ret < 0) {
413                         if (ret != -ENOENT)
414                                 return ret;
415                         bdescs[i].bd_blocknr = 0;
416                 }
417                 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
418                         /* skip dead block */
419                         continue;
420                 if (bdescs[i].bd_level == 0) {
421                         ret = nilfs_mdt_mark_block_dirty(dat,
422                                                          bdescs[i].bd_offset);
423                         if (ret < 0) {
424                                 WARN_ON(ret == -ENOENT);
425                                 return ret;
426                         }
427                 } else {
428                         ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
429                                               bdescs[i].bd_level);
430                         if (ret < 0) {
431                                 WARN_ON(ret == -ENOENT);
432                                 return ret;
433                         }
434                 }
435         }
436         return nmembs;
437 }
438 
439 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
440                                        struct nilfs_argv *argv, void **kbufs)
441 {
442         const char *msg;
443         int ret;
444 
445         ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
446         if (ret < 0) {
447                 /*
448                  * can safely abort because checkpoints can be removed
449                  * independently.
450                  */
451                 msg = "cannot delete checkpoints";
452                 goto failed;
453         }
454         ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
455         if (ret < 0) {
456                 /*
457                  * can safely abort because DAT file is updated atomically
458                  * using a copy-on-write technique.
459                  */
460                 msg = "cannot delete virtual blocks from DAT file";
461                 goto failed;
462         }
463         ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
464         if (ret < 0) {
465                 /*
466                  * can safely abort because the operation is nondestructive.
467                  */
468                 msg = "cannot mark copying blocks dirty";
469                 goto failed;
470         }
471         return 0;
472 
473  failed:
474         printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
475                msg, ret);
476         return ret;
477 }
478 
479 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
480                                       unsigned int cmd, void __user *argp)
481 {
482         struct nilfs_argv argv[5];
483         const static size_t argsz[5] = {
484                 sizeof(struct nilfs_vdesc),
485                 sizeof(struct nilfs_period),
486                 sizeof(__u64),
487                 sizeof(struct nilfs_bdesc),
488                 sizeof(__u64),
489         };
490         void __user *base;
491         void *kbufs[5];
492         struct the_nilfs *nilfs;
493         size_t len, nsegs;
494         int n, ret;
495 
496         if (!capable(CAP_SYS_ADMIN))
497                 return -EPERM;
498 
499         if (copy_from_user(argv, argp, sizeof(argv)))
500                 return -EFAULT;
501 
502         nsegs = argv[4].v_nmembs;
503         if (argv[4].v_size != argsz[4])
504                 return -EINVAL;
505         /*
506          * argv[4] points to segment numbers this ioctl cleans.  We
507          * use kmalloc() for its buffer because memory used for the
508          * segment numbers is enough small.
509          */
510         kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
511                                nsegs * sizeof(__u64));
512         if (IS_ERR(kbufs[4]))
513                 return PTR_ERR(kbufs[4]);
514 
515         nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
516 
517         for (n = 0; n < 4; n++) {
518                 ret = -EINVAL;
519                 if (argv[n].v_size != argsz[n])
520                         goto out_free;
521 
522                 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
523                         goto out_free;
524 
525                 len = argv[n].v_size * argv[n].v_nmembs;
526                 base = (void __user *)(unsigned long)argv[n].v_base;
527                 if (len == 0) {
528                         kbufs[n] = NULL;
529                         continue;
530                 }
531 
532                 kbufs[n] = vmalloc(len);
533                 if (!kbufs[n]) {
534                         ret = -ENOMEM;
535                         goto out_free;
536                 }
537                 if (copy_from_user(kbufs[n], base, len)) {
538                         ret = -EFAULT;
539                         vfree(kbufs[n]);
540                         goto out_free;
541                 }
542         }
543 
544         /*
545          * nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
546          * which will operates an inode list without blocking.
547          * To protect the list from concurrent operations,
548          * nilfs_ioctl_move_blocks should be atomic operation.
549          */
550         if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
551                 ret = -EBUSY;
552                 goto out_free;
553         }
554 
555         ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
556         if (ret < 0)
557                 printk(KERN_ERR "NILFS: GC failed during preparation: "
558                         "cannot read source blocks: err=%d\n", ret);
559         else
560                 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
561 
562         if (ret < 0)
563                 nilfs_remove_all_gcinode(nilfs);
564         clear_nilfs_gc_running(nilfs);
565 
566  out_free:
567         while (--n >= 0)
568                 vfree(kbufs[n]);
569         kfree(kbufs[4]);
570         return ret;
571 }
572 
573 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
574                             unsigned int cmd, void __user *argp)
575 {
576         __u64 cno;
577         int ret;
578 
579         ret = nilfs_construct_segment(inode->i_sb);
580         if (ret < 0)
581                 return ret;
582 
583         if (argp != NULL) {
584                 cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
585                 if (copy_to_user(argp, &cno, sizeof(cno)))
586                         return -EFAULT;
587         }
588         return 0;
589 }
590 
591 static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
592                                 unsigned int cmd, void __user *argp,
593                                 size_t membsz,
594                                 ssize_t (*dofunc)(struct the_nilfs *,
595                                                   __u64 *, int,
596                                                   void *, size_t, size_t))
597 
598 {
599         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
600         struct nilfs_argv argv;
601         int ret;
602 
603         if (copy_from_user(&argv, argp, sizeof(argv)))
604                 return -EFAULT;
605 
606         if (argv.v_size < membsz)
607                 return -EINVAL;
608 
609         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
610         if (ret < 0)
611                 return ret;
612 
613         if (copy_to_user(argp, &argv, sizeof(argv)))
614                 ret = -EFAULT;
615         return ret;
616 }
617 
618 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
619 {
620         struct inode *inode = filp->f_dentry->d_inode;
621         void __user *argp = (void * __user *)arg;
622 
623         switch (cmd) {
624         case NILFS_IOCTL_CHANGE_CPMODE:
625                 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
626         case NILFS_IOCTL_DELETE_CHECKPOINT:
627                 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
628         case NILFS_IOCTL_GET_CPINFO:
629                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
630                                             sizeof(struct nilfs_cpinfo),
631                                             nilfs_ioctl_do_get_cpinfo);
632         case NILFS_IOCTL_GET_CPSTAT:
633                 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
634         case NILFS_IOCTL_GET_SUINFO:
635                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
636                                             sizeof(struct nilfs_suinfo),
637                                             nilfs_ioctl_do_get_suinfo);
638         case NILFS_IOCTL_GET_SUSTAT:
639                 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
640         case NILFS_IOCTL_GET_VINFO:
641                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
642                                             sizeof(struct nilfs_vinfo),
643                                             nilfs_ioctl_do_get_vinfo);
644         case NILFS_IOCTL_GET_BDESCS:
645                 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
646         case NILFS_IOCTL_CLEAN_SEGMENTS:
647                 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
648         case NILFS_IOCTL_SYNC:
649                 return nilfs_ioctl_sync(inode, filp, cmd, argp);
650         default:
651                 return -ENOTTY;
652         }
653 }
654 

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