Root/
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/slab.h> |
27 | #include <linux/capability.h> /* capable() */ |
28 | #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ |
29 | #include <linux/vmalloc.h> |
30 | #include <linux/mount.h> /* mnt_want_write(), mnt_drop_write() */ |
31 | #include <linux/nilfs2_fs.h> |
32 | #include "nilfs.h" |
33 | #include "segment.h" |
34 | #include "bmap.h" |
35 | #include "cpfile.h" |
36 | #include "sufile.h" |
37 | #include "dat.h" |
38 | |
39 | |
40 | static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs, |
41 | struct nilfs_argv *argv, int dir, |
42 | ssize_t (*dofunc)(struct the_nilfs *, |
43 | __u64 *, int, |
44 | void *, size_t, size_t)) |
45 | { |
46 | void *buf; |
47 | void __user *base = (void __user *)(unsigned long)argv->v_base; |
48 | size_t maxmembs, total, n; |
49 | ssize_t nr; |
50 | int ret, i; |
51 | __u64 pos, ppos; |
52 | |
53 | if (argv->v_nmembs == 0) |
54 | return 0; |
55 | |
56 | if (argv->v_size > PAGE_SIZE) |
57 | return -EINVAL; |
58 | |
59 | buf = (void *)__get_free_pages(GFP_NOFS, 0); |
60 | if (unlikely(!buf)) |
61 | return -ENOMEM; |
62 | maxmembs = PAGE_SIZE / argv->v_size; |
63 | |
64 | ret = 0; |
65 | total = 0; |
66 | pos = argv->v_index; |
67 | for (i = 0; i < argv->v_nmembs; i += n) { |
68 | n = (argv->v_nmembs - i < maxmembs) ? |
69 | argv->v_nmembs - i : maxmembs; |
70 | if ((dir & _IOC_WRITE) && |
71 | copy_from_user(buf, base + argv->v_size * i, |
72 | argv->v_size * n)) { |
73 | ret = -EFAULT; |
74 | break; |
75 | } |
76 | ppos = pos; |
77 | nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, |
78 | n); |
79 | if (nr < 0) { |
80 | ret = nr; |
81 | break; |
82 | } |
83 | if ((dir & _IOC_READ) && |
84 | copy_to_user(base + argv->v_size * i, buf, |
85 | argv->v_size * nr)) { |
86 | ret = -EFAULT; |
87 | break; |
88 | } |
89 | total += nr; |
90 | if ((size_t)nr < n) |
91 | break; |
92 | if (pos == ppos) |
93 | pos += n; |
94 | } |
95 | argv->v_nmembs = total; |
96 | |
97 | free_pages((unsigned long)buf, 0); |
98 | return ret; |
99 | } |
100 | |
101 | static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, |
102 | unsigned int cmd, void __user *argp) |
103 | { |
104 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
105 | struct inode *cpfile = nilfs->ns_cpfile; |
106 | struct nilfs_transaction_info ti; |
107 | struct nilfs_cpmode cpmode; |
108 | int ret; |
109 | |
110 | if (!capable(CAP_SYS_ADMIN)) |
111 | return -EPERM; |
112 | |
113 | ret = mnt_want_write(filp->f_path.mnt); |
114 | if (ret) |
115 | return ret; |
116 | |
117 | ret = -EFAULT; |
118 | if (copy_from_user(&cpmode, argp, sizeof(cpmode))) |
119 | goto out; |
120 | |
121 | mutex_lock(&nilfs->ns_mount_mutex); |
122 | |
123 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
124 | ret = nilfs_cpfile_change_cpmode( |
125 | cpfile, cpmode.cm_cno, cpmode.cm_mode); |
126 | if (unlikely(ret < 0)) |
127 | nilfs_transaction_abort(inode->i_sb); |
128 | else |
129 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
130 | |
131 | mutex_unlock(&nilfs->ns_mount_mutex); |
132 | out: |
133 | mnt_drop_write(filp->f_path.mnt); |
134 | return ret; |
135 | } |
136 | |
137 | static int |
138 | nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, |
139 | unsigned int cmd, void __user *argp) |
140 | { |
141 | struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile; |
142 | struct nilfs_transaction_info ti; |
143 | __u64 cno; |
144 | int ret; |
145 | |
146 | if (!capable(CAP_SYS_ADMIN)) |
147 | return -EPERM; |
148 | |
149 | ret = mnt_want_write(filp->f_path.mnt); |
150 | if (ret) |
151 | return ret; |
152 | |
153 | ret = -EFAULT; |
154 | if (copy_from_user(&cno, argp, sizeof(cno))) |
155 | goto out; |
156 | |
157 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
158 | ret = nilfs_cpfile_delete_checkpoint(cpfile, cno); |
159 | if (unlikely(ret < 0)) |
160 | nilfs_transaction_abort(inode->i_sb); |
161 | else |
162 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
163 | out: |
164 | mnt_drop_write(filp->f_path.mnt); |
165 | return ret; |
166 | } |
167 | |
168 | static ssize_t |
169 | nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
170 | void *buf, size_t size, size_t nmembs) |
171 | { |
172 | int ret; |
173 | |
174 | down_read(&nilfs->ns_segctor_sem); |
175 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
176 | size, nmembs); |
177 | up_read(&nilfs->ns_segctor_sem); |
178 | return ret; |
179 | } |
180 | |
181 | static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp, |
182 | unsigned int cmd, void __user *argp) |
183 | { |
184 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
185 | struct nilfs_cpstat cpstat; |
186 | int ret; |
187 | |
188 | down_read(&nilfs->ns_segctor_sem); |
189 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); |
190 | up_read(&nilfs->ns_segctor_sem); |
191 | if (ret < 0) |
192 | return ret; |
193 | |
194 | if (copy_to_user(argp, &cpstat, sizeof(cpstat))) |
195 | ret = -EFAULT; |
196 | return ret; |
197 | } |
198 | |
199 | static ssize_t |
200 | nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
201 | void *buf, size_t size, size_t nmembs) |
202 | { |
203 | int ret; |
204 | |
205 | down_read(&nilfs->ns_segctor_sem); |
206 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
207 | nmembs); |
208 | up_read(&nilfs->ns_segctor_sem); |
209 | return ret; |
210 | } |
211 | |
212 | static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp, |
213 | unsigned int cmd, void __user *argp) |
214 | { |
215 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
216 | struct nilfs_sustat sustat; |
217 | int ret; |
218 | |
219 | down_read(&nilfs->ns_segctor_sem); |
220 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); |
221 | up_read(&nilfs->ns_segctor_sem); |
222 | if (ret < 0) |
223 | return ret; |
224 | |
225 | if (copy_to_user(argp, &sustat, sizeof(sustat))) |
226 | ret = -EFAULT; |
227 | return ret; |
228 | } |
229 | |
230 | static ssize_t |
231 | nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
232 | void *buf, size_t size, size_t nmembs) |
233 | { |
234 | int ret; |
235 | |
236 | down_read(&nilfs->ns_segctor_sem); |
237 | ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs); |
238 | up_read(&nilfs->ns_segctor_sem); |
239 | return ret; |
240 | } |
241 | |
242 | static ssize_t |
243 | nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, |
244 | void *buf, size_t size, size_t nmembs) |
245 | { |
246 | struct inode *dat = nilfs_dat_inode(nilfs); |
247 | struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap; |
248 | struct nilfs_bdesc *bdescs = buf; |
249 | int ret, i; |
250 | |
251 | down_read(&nilfs->ns_segctor_sem); |
252 | for (i = 0; i < nmembs; i++) { |
253 | ret = nilfs_bmap_lookup_at_level(bmap, |
254 | bdescs[i].bd_offset, |
255 | bdescs[i].bd_level + 1, |
256 | &bdescs[i].bd_blocknr); |
257 | if (ret < 0) { |
258 | if (ret != -ENOENT) { |
259 | up_read(&nilfs->ns_segctor_sem); |
260 | return ret; |
261 | } |
262 | bdescs[i].bd_blocknr = 0; |
263 | } |
264 | } |
265 | up_read(&nilfs->ns_segctor_sem); |
266 | return nmembs; |
267 | } |
268 | |
269 | static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp, |
270 | unsigned int cmd, void __user *argp) |
271 | { |
272 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
273 | struct nilfs_argv argv; |
274 | int ret; |
275 | |
276 | if (copy_from_user(&argv, argp, sizeof(argv))) |
277 | return -EFAULT; |
278 | |
279 | if (argv.v_size != sizeof(struct nilfs_bdesc)) |
280 | return -EINVAL; |
281 | |
282 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), |
283 | nilfs_ioctl_do_get_bdescs); |
284 | if (ret < 0) |
285 | return ret; |
286 | |
287 | if (copy_to_user(argp, &argv, sizeof(argv))) |
288 | ret = -EFAULT; |
289 | return ret; |
290 | } |
291 | |
292 | static int nilfs_ioctl_move_inode_block(struct inode *inode, |
293 | struct nilfs_vdesc *vdesc, |
294 | struct list_head *buffers) |
295 | { |
296 | struct buffer_head *bh; |
297 | int ret; |
298 | |
299 | if (vdesc->vd_flags == 0) |
300 | ret = nilfs_gccache_submit_read_data( |
301 | inode, vdesc->vd_offset, vdesc->vd_blocknr, |
302 | vdesc->vd_vblocknr, &bh); |
303 | else |
304 | ret = nilfs_gccache_submit_read_node( |
305 | inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh); |
306 | |
307 | if (unlikely(ret < 0)) { |
308 | if (ret == -ENOENT) |
309 | printk(KERN_CRIT |
310 | "%s: invalid virtual block address (%s): " |
311 | "ino=%llu, cno=%llu, offset=%llu, " |
312 | "blocknr=%llu, vblocknr=%llu\n", |
313 | __func__, vdesc->vd_flags ? "node" : "data", |
314 | (unsigned long long)vdesc->vd_ino, |
315 | (unsigned long long)vdesc->vd_cno, |
316 | (unsigned long long)vdesc->vd_offset, |
317 | (unsigned long long)vdesc->vd_blocknr, |
318 | (unsigned long long)vdesc->vd_vblocknr); |
319 | return ret; |
320 | } |
321 | if (unlikely(!list_empty(&bh->b_assoc_buffers))) { |
322 | printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, " |
323 | "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n", |
324 | __func__, vdesc->vd_flags ? "node" : "data", |
325 | (unsigned long long)vdesc->vd_ino, |
326 | (unsigned long long)vdesc->vd_cno, |
327 | (unsigned long long)vdesc->vd_offset, |
328 | (unsigned long long)vdesc->vd_blocknr, |
329 | (unsigned long long)vdesc->vd_vblocknr); |
330 | brelse(bh); |
331 | return -EEXIST; |
332 | } |
333 | list_add_tail(&bh->b_assoc_buffers, buffers); |
334 | return 0; |
335 | } |
336 | |
337 | static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs, |
338 | struct nilfs_argv *argv, void *buf) |
339 | { |
340 | size_t nmembs = argv->v_nmembs; |
341 | struct inode *inode; |
342 | struct nilfs_vdesc *vdesc; |
343 | struct buffer_head *bh, *n; |
344 | LIST_HEAD(buffers); |
345 | ino_t ino; |
346 | __u64 cno; |
347 | int i, ret; |
348 | |
349 | for (i = 0, vdesc = buf; i < nmembs; ) { |
350 | ino = vdesc->vd_ino; |
351 | cno = vdesc->vd_cno; |
352 | inode = nilfs_gc_iget(nilfs, ino, cno); |
353 | if (unlikely(inode == NULL)) { |
354 | ret = -ENOMEM; |
355 | goto failed; |
356 | } |
357 | do { |
358 | ret = nilfs_ioctl_move_inode_block(inode, vdesc, |
359 | &buffers); |
360 | if (unlikely(ret < 0)) |
361 | goto failed; |
362 | vdesc++; |
363 | } while (++i < nmembs && |
364 | vdesc->vd_ino == ino && vdesc->vd_cno == cno); |
365 | } |
366 | |
367 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { |
368 | ret = nilfs_gccache_wait_and_mark_dirty(bh); |
369 | if (unlikely(ret < 0)) { |
370 | WARN_ON(ret == -EEXIST); |
371 | goto failed; |
372 | } |
373 | list_del_init(&bh->b_assoc_buffers); |
374 | brelse(bh); |
375 | } |
376 | return nmembs; |
377 | |
378 | failed: |
379 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { |
380 | list_del_init(&bh->b_assoc_buffers); |
381 | brelse(bh); |
382 | } |
383 | return ret; |
384 | } |
385 | |
386 | static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, |
387 | struct nilfs_argv *argv, void *buf) |
388 | { |
389 | size_t nmembs = argv->v_nmembs; |
390 | struct inode *cpfile = nilfs->ns_cpfile; |
391 | struct nilfs_period *periods = buf; |
392 | int ret, i; |
393 | |
394 | for (i = 0; i < nmembs; i++) { |
395 | ret = nilfs_cpfile_delete_checkpoints( |
396 | cpfile, periods[i].p_start, periods[i].p_end); |
397 | if (ret < 0) |
398 | return ret; |
399 | } |
400 | return nmembs; |
401 | } |
402 | |
403 | static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, |
404 | struct nilfs_argv *argv, void *buf) |
405 | { |
406 | size_t nmembs = argv->v_nmembs; |
407 | int ret; |
408 | |
409 | ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs); |
410 | |
411 | return (ret < 0) ? ret : nmembs; |
412 | } |
413 | |
414 | static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, |
415 | struct nilfs_argv *argv, void *buf) |
416 | { |
417 | size_t nmembs = argv->v_nmembs; |
418 | struct inode *dat = nilfs_dat_inode(nilfs); |
419 | struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap; |
420 | struct nilfs_bdesc *bdescs = buf; |
421 | int ret, i; |
422 | |
423 | for (i = 0; i < nmembs; i++) { |
424 | /* XXX: use macro or inline func to check liveness */ |
425 | ret = nilfs_bmap_lookup_at_level(bmap, |
426 | bdescs[i].bd_offset, |
427 | bdescs[i].bd_level + 1, |
428 | &bdescs[i].bd_blocknr); |
429 | if (ret < 0) { |
430 | if (ret != -ENOENT) |
431 | return ret; |
432 | bdescs[i].bd_blocknr = 0; |
433 | } |
434 | if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr) |
435 | /* skip dead block */ |
436 | continue; |
437 | if (bdescs[i].bd_level == 0) { |
438 | ret = nilfs_mdt_mark_block_dirty(dat, |
439 | bdescs[i].bd_offset); |
440 | if (ret < 0) { |
441 | WARN_ON(ret == -ENOENT); |
442 | return ret; |
443 | } |
444 | } else { |
445 | ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset, |
446 | bdescs[i].bd_level); |
447 | if (ret < 0) { |
448 | WARN_ON(ret == -ENOENT); |
449 | return ret; |
450 | } |
451 | } |
452 | } |
453 | return nmembs; |
454 | } |
455 | |
456 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, |
457 | struct nilfs_argv *argv, void **kbufs) |
458 | { |
459 | const char *msg; |
460 | int ret; |
461 | |
462 | ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); |
463 | if (ret < 0) { |
464 | /* |
465 | * can safely abort because checkpoints can be removed |
466 | * independently. |
467 | */ |
468 | msg = "cannot delete checkpoints"; |
469 | goto failed; |
470 | } |
471 | ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); |
472 | if (ret < 0) { |
473 | /* |
474 | * can safely abort because DAT file is updated atomically |
475 | * using a copy-on-write technique. |
476 | */ |
477 | msg = "cannot delete virtual blocks from DAT file"; |
478 | goto failed; |
479 | } |
480 | ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); |
481 | if (ret < 0) { |
482 | /* |
483 | * can safely abort because the operation is nondestructive. |
484 | */ |
485 | msg = "cannot mark copying blocks dirty"; |
486 | goto failed; |
487 | } |
488 | return 0; |
489 | |
490 | failed: |
491 | printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n", |
492 | msg, ret); |
493 | return ret; |
494 | } |
495 | |
496 | static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, |
497 | unsigned int cmd, void __user *argp) |
498 | { |
499 | struct nilfs_argv argv[5]; |
500 | static const size_t argsz[5] = { |
501 | sizeof(struct nilfs_vdesc), |
502 | sizeof(struct nilfs_period), |
503 | sizeof(__u64), |
504 | sizeof(struct nilfs_bdesc), |
505 | sizeof(__u64), |
506 | }; |
507 | void __user *base; |
508 | void *kbufs[5]; |
509 | struct the_nilfs *nilfs; |
510 | size_t len, nsegs; |
511 | int n, ret; |
512 | |
513 | if (!capable(CAP_SYS_ADMIN)) |
514 | return -EPERM; |
515 | |
516 | ret = mnt_want_write(filp->f_path.mnt); |
517 | if (ret) |
518 | return ret; |
519 | |
520 | ret = -EFAULT; |
521 | if (copy_from_user(argv, argp, sizeof(argv))) |
522 | goto out; |
523 | |
524 | ret = -EINVAL; |
525 | nsegs = argv[4].v_nmembs; |
526 | if (argv[4].v_size != argsz[4]) |
527 | goto out; |
528 | |
529 | /* |
530 | * argv[4] points to segment numbers this ioctl cleans. We |
531 | * use kmalloc() for its buffer because memory used for the |
532 | * segment numbers is enough small. |
533 | */ |
534 | kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base, |
535 | nsegs * sizeof(__u64)); |
536 | if (IS_ERR(kbufs[4])) { |
537 | ret = PTR_ERR(kbufs[4]); |
538 | goto out; |
539 | } |
540 | nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
541 | |
542 | for (n = 0; n < 4; n++) { |
543 | ret = -EINVAL; |
544 | if (argv[n].v_size != argsz[n]) |
545 | goto out_free; |
546 | |
547 | if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment) |
548 | goto out_free; |
549 | |
550 | len = argv[n].v_size * argv[n].v_nmembs; |
551 | base = (void __user *)(unsigned long)argv[n].v_base; |
552 | if (len == 0) { |
553 | kbufs[n] = NULL; |
554 | continue; |
555 | } |
556 | |
557 | kbufs[n] = vmalloc(len); |
558 | if (!kbufs[n]) { |
559 | ret = -ENOMEM; |
560 | goto out_free; |
561 | } |
562 | if (copy_from_user(kbufs[n], base, len)) { |
563 | ret = -EFAULT; |
564 | vfree(kbufs[n]); |
565 | goto out_free; |
566 | } |
567 | } |
568 | |
569 | /* |
570 | * nilfs_ioctl_move_blocks() will call nilfs_gc_iget(), |
571 | * which will operates an inode list without blocking. |
572 | * To protect the list from concurrent operations, |
573 | * nilfs_ioctl_move_blocks should be atomic operation. |
574 | */ |
575 | if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) { |
576 | ret = -EBUSY; |
577 | goto out_free; |
578 | } |
579 | |
580 | ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]); |
581 | if (ret < 0) |
582 | printk(KERN_ERR "NILFS: GC failed during preparation: " |
583 | "cannot read source blocks: err=%d\n", ret); |
584 | else |
585 | ret = nilfs_clean_segments(inode->i_sb, argv, kbufs); |
586 | |
587 | if (ret < 0) |
588 | nilfs_remove_all_gcinode(nilfs); |
589 | clear_nilfs_gc_running(nilfs); |
590 | |
591 | out_free: |
592 | while (--n >= 0) |
593 | vfree(kbufs[n]); |
594 | kfree(kbufs[4]); |
595 | out: |
596 | mnt_drop_write(filp->f_path.mnt); |
597 | return ret; |
598 | } |
599 | |
600 | static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, |
601 | unsigned int cmd, void __user *argp) |
602 | { |
603 | __u64 cno; |
604 | int ret; |
605 | struct the_nilfs *nilfs; |
606 | |
607 | ret = nilfs_construct_segment(inode->i_sb); |
608 | if (ret < 0) |
609 | return ret; |
610 | |
611 | if (argp != NULL) { |
612 | nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
613 | down_read(&nilfs->ns_segctor_sem); |
614 | cno = nilfs->ns_cno - 1; |
615 | up_read(&nilfs->ns_segctor_sem); |
616 | if (copy_to_user(argp, &cno, sizeof(cno))) |
617 | return -EFAULT; |
618 | } |
619 | return 0; |
620 | } |
621 | |
622 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
623 | unsigned int cmd, void __user *argp, |
624 | size_t membsz, |
625 | ssize_t (*dofunc)(struct the_nilfs *, |
626 | __u64 *, int, |
627 | void *, size_t, size_t)) |
628 | |
629 | { |
630 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
631 | struct nilfs_argv argv; |
632 | int ret; |
633 | |
634 | if (copy_from_user(&argv, argp, sizeof(argv))) |
635 | return -EFAULT; |
636 | |
637 | if (argv.v_size < membsz) |
638 | return -EINVAL; |
639 | |
640 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc); |
641 | if (ret < 0) |
642 | return ret; |
643 | |
644 | if (copy_to_user(argp, &argv, sizeof(argv))) |
645 | ret = -EFAULT; |
646 | return ret; |
647 | } |
648 | |
649 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
650 | { |
651 | struct inode *inode = filp->f_dentry->d_inode; |
652 | void __user *argp = (void __user *)arg; |
653 | |
654 | switch (cmd) { |
655 | case NILFS_IOCTL_CHANGE_CPMODE: |
656 | return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp); |
657 | case NILFS_IOCTL_DELETE_CHECKPOINT: |
658 | return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp); |
659 | case NILFS_IOCTL_GET_CPINFO: |
660 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
661 | sizeof(struct nilfs_cpinfo), |
662 | nilfs_ioctl_do_get_cpinfo); |
663 | case NILFS_IOCTL_GET_CPSTAT: |
664 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); |
665 | case NILFS_IOCTL_GET_SUINFO: |
666 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
667 | sizeof(struct nilfs_suinfo), |
668 | nilfs_ioctl_do_get_suinfo); |
669 | case NILFS_IOCTL_GET_SUSTAT: |
670 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); |
671 | case NILFS_IOCTL_GET_VINFO: |
672 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
673 | sizeof(struct nilfs_vinfo), |
674 | nilfs_ioctl_do_get_vinfo); |
675 | case NILFS_IOCTL_GET_BDESCS: |
676 | return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp); |
677 | case NILFS_IOCTL_CLEAN_SEGMENTS: |
678 | return nilfs_ioctl_clean_segments(inode, filp, cmd, argp); |
679 | case NILFS_IOCTL_SYNC: |
680 | return nilfs_ioctl_sync(inode, filp, cmd, argp); |
681 | default: |
682 | return -ENOTTY; |
683 | } |
684 | } |
685 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9