Commit | Line | Data |
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7942b919 KS |
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() */ | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
7942b919 KS |
27 | #include <linux/capability.h> /* capable() */ |
28 | #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ | |
4f6b8288 | 29 | #include <linux/vmalloc.h> |
7512487e | 30 | #include <linux/mount.h> /* mnt_want_write(), mnt_drop_write() */ |
7942b919 KS |
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 | ||
7942b919 KS |
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 *, | |
b028fcfc | 43 | __u64 *, int, |
7942b919 KS |
44 | void *, size_t, size_t)) |
45 | { | |
46 | void *buf; | |
dc498d09 | 47 | void __user *base = (void __user *)(unsigned long)argv->v_base; |
3358b4aa | 48 | size_t maxmembs, total, n; |
7942b919 KS |
49 | ssize_t nr; |
50 | int ret, i; | |
b028fcfc | 51 | __u64 pos, ppos; |
7942b919 KS |
52 | |
53 | if (argv->v_nmembs == 0) | |
54 | return 0; | |
55 | ||
3358b4aa RK |
56 | if (argv->v_size > PAGE_SIZE) |
57 | return -EINVAL; | |
58 | ||
59 | buf = (void *)__get_free_pages(GFP_NOFS, 0); | |
60 | if (unlikely(!buf)) | |
7942b919 | 61 | return -ENOMEM; |
3358b4aa | 62 | maxmembs = PAGE_SIZE / argv->v_size; |
7942b919 KS |
63 | |
64 | ret = 0; | |
65 | total = 0; | |
b028fcfc | 66 | pos = argv->v_index; |
7942b919 KS |
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) && | |
dc498d09 RK |
71 | copy_from_user(buf, base + argv->v_size * i, |
72 | argv->v_size * n)) { | |
7942b919 KS |
73 | ret = -EFAULT; |
74 | break; | |
75 | } | |
b028fcfc | 76 | ppos = pos; |
8acfbf09 | 77 | nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, |
b028fcfc | 78 | n); |
7942b919 KS |
79 | if (nr < 0) { |
80 | ret = nr; | |
81 | break; | |
82 | } | |
83 | if ((dir & _IOC_READ) && | |
dc498d09 RK |
84 | copy_to_user(base + argv->v_size * i, buf, |
85 | argv->v_size * nr)) { | |
7942b919 KS |
86 | ret = -EFAULT; |
87 | break; | |
88 | } | |
89 | total += nr; | |
b028fcfc RK |
90 | if ((size_t)nr < n) |
91 | break; | |
92 | if (pos == ppos) | |
93 | pos += n; | |
7942b919 KS |
94 | } |
95 | argv->v_nmembs = total; | |
96 | ||
3358b4aa | 97 | free_pages((unsigned long)buf, 0); |
7942b919 KS |
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 | { | |
c1ea985c RK |
104 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
105 | struct inode *cpfile = nilfs->ns_cpfile; | |
7942b919 KS |
106 | struct nilfs_transaction_info ti; |
107 | struct nilfs_cpmode cpmode; | |
108 | int ret; | |
109 | ||
110 | if (!capable(CAP_SYS_ADMIN)) | |
111 | return -EPERM; | |
7512487e RK |
112 | |
113 | ret = mnt_want_write(filp->f_path.mnt); | |
114 | if (ret) | |
115 | return ret; | |
116 | ||
117 | ret = -EFAULT; | |
7942b919 | 118 | if (copy_from_user(&cpmode, argp, sizeof(cpmode))) |
7512487e | 119 | goto out; |
7942b919 | 120 | |
c1ea985c | 121 | mutex_lock(&nilfs->ns_mount_mutex); |
7512487e | 122 | |
7942b919 KS |
123 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
124 | ret = nilfs_cpfile_change_cpmode( | |
125 | cpfile, cpmode.cm_cno, cpmode.cm_mode); | |
7512487e | 126 | if (unlikely(ret < 0)) |
47420c79 | 127 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
128 | else |
129 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
130 | ||
c1ea985c | 131 | mutex_unlock(&nilfs->ns_mount_mutex); |
7512487e RK |
132 | out: |
133 | mnt_drop_write(filp->f_path.mnt); | |
7942b919 KS |
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; | |
7512487e RK |
148 | |
149 | ret = mnt_want_write(filp->f_path.mnt); | |
150 | if (ret) | |
151 | return ret; | |
152 | ||
153 | ret = -EFAULT; | |
7942b919 | 154 | if (copy_from_user(&cno, argp, sizeof(cno))) |
7512487e | 155 | goto out; |
7942b919 KS |
156 | |
157 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
158 | ret = nilfs_cpfile_delete_checkpoint(cpfile, cno); | |
7512487e | 159 | if (unlikely(ret < 0)) |
47420c79 | 160 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
161 | else |
162 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
163 | out: | |
164 | mnt_drop_write(filp->f_path.mnt); | |
7942b919 KS |
165 | return ret; |
166 | } | |
167 | ||
168 | static ssize_t | |
b028fcfc | 169 | nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
170 | void *buf, size_t size, size_t nmembs) |
171 | { | |
7942b919 KS |
172 | int ret; |
173 | ||
47420c79 | 174 | down_read(&nilfs->ns_segctor_sem); |
47eb6b9c | 175 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
003ff182 | 176 | size, nmembs); |
47420c79 | 177 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
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 | { | |
47420c79 | 184 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
7942b919 | 185 | struct nilfs_cpstat cpstat; |
7942b919 KS |
186 | int ret; |
187 | ||
47420c79 RK |
188 | down_read(&nilfs->ns_segctor_sem); |
189 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); | |
190 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
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 | |
b028fcfc | 200 | nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
201 | void *buf, size_t size, size_t nmembs) |
202 | { | |
7942b919 KS |
203 | int ret; |
204 | ||
47420c79 | 205 | down_read(&nilfs->ns_segctor_sem); |
003ff182 RK |
206 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
207 | nmembs); | |
47420c79 | 208 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
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 | { | |
47420c79 | 215 | struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs; |
7942b919 | 216 | struct nilfs_sustat sustat; |
7942b919 KS |
217 | int ret; |
218 | ||
47420c79 RK |
219 | down_read(&nilfs->ns_segctor_sem); |
220 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); | |
221 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
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 | |
b028fcfc | 231 | nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
232 | void *buf, size_t size, size_t nmembs) |
233 | { | |
7942b919 KS |
234 | int ret; |
235 | ||
47420c79 | 236 | down_read(&nilfs->ns_segctor_sem); |
003ff182 | 237 | ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs); |
47420c79 | 238 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
239 | return ret; |
240 | } | |
241 | ||
242 | static ssize_t | |
b028fcfc | 243 | nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
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 | ||
47eb6b9c | 251 | down_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
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) { | |
47eb6b9c RK |
258 | if (ret != -ENOENT) { |
259 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 | 260 | return ret; |
47eb6b9c | 261 | } |
7942b919 KS |
262 | bdescs[i].bd_blocknr = 0; |
263 | } | |
264 | } | |
47eb6b9c | 265 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
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; | |
7942b919 KS |
274 | int ret; |
275 | ||
276 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
277 | return -EFAULT; | |
278 | ||
83aca8f4 RK |
279 | if (argv.v_size != sizeof(struct nilfs_bdesc)) |
280 | return -EINVAL; | |
281 | ||
7942b919 KS |
282 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), |
283 | nilfs_ioctl_do_get_bdescs); | |
47420c79 RK |
284 | if (ret < 0) |
285 | return ret; | |
7942b919 KS |
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 | } | |
5399dd1f RK |
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 | } | |
7942b919 KS |
333 | list_add_tail(&bh->b_assoc_buffers, buffers); |
334 | return 0; | |
335 | } | |
336 | ||
4f6b8288 RK |
337 | static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs, |
338 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 339 | { |
4f6b8288 | 340 | size_t nmembs = argv->v_nmembs; |
7942b919 KS |
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)) { | |
5399dd1f | 370 | WARN_ON(ret == -EEXIST); |
7942b919 KS |
371 | goto failed; |
372 | } | |
373 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
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); | |
7942b919 KS |
381 | brelse(bh); |
382 | } | |
383 | return ret; | |
384 | } | |
385 | ||
4f6b8288 RK |
386 | static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, |
387 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 388 | { |
4f6b8288 | 389 | size_t nmembs = argv->v_nmembs; |
7942b919 KS |
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 | ||
4f6b8288 RK |
403 | static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, |
404 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 405 | { |
4f6b8288 RK |
406 | size_t nmembs = argv->v_nmembs; |
407 | int ret; | |
7942b919 | 408 | |
4f6b8288 | 409 | ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs); |
7942b919 KS |
410 | |
411 | return (ret < 0) ? ret : nmembs; | |
412 | } | |
413 | ||
4f6b8288 RK |
414 | static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, |
415 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 416 | { |
4f6b8288 | 417 | size_t nmembs = argv->v_nmembs; |
7942b919 KS |
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) { | |
1f5abe7e | 441 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
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) { | |
1f5abe7e | 448 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
449 | return ret; |
450 | } | |
451 | } | |
452 | } | |
453 | return nmembs; | |
454 | } | |
455 | ||
7942b919 | 456 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, |
4f6b8288 | 457 | struct nilfs_argv *argv, void **kbufs) |
7942b919 | 458 | { |
1f5abe7e | 459 | const char *msg; |
4f6b8288 | 460 | int ret; |
7942b919 | 461 | |
4f6b8288 | 462 | ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); |
1f5abe7e RK |
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 | } | |
4f6b8288 | 471 | ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); |
1f5abe7e RK |
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 | } | |
4f6b8288 | 480 | ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); |
1f5abe7e RK |
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 | } | |
7942b919 KS |
488 | return 0; |
489 | ||
1f5abe7e | 490 | failed: |
1f5abe7e RK |
491 | printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n", |
492 | msg, ret); | |
7942b919 KS |
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 | { | |
4f6b8288 | 499 | struct nilfs_argv argv[5]; |
33e189bd | 500 | static const size_t argsz[5] = { |
4f6b8288 RK |
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 | ||
7942b919 KS |
513 | if (!capable(CAP_SYS_ADMIN)) |
514 | return -EPERM; | |
4f6b8288 | 515 | |
7512487e RK |
516 | ret = mnt_want_write(filp->f_path.mnt); |
517 | if (ret) | |
518 | return ret; | |
519 | ||
520 | ret = -EFAULT; | |
4f6b8288 | 521 | if (copy_from_user(argv, argp, sizeof(argv))) |
7512487e | 522 | goto out; |
4f6b8288 | 523 | |
7512487e | 524 | ret = -EINVAL; |
4f6b8288 RK |
525 | nsegs = argv[4].v_nmembs; |
526 | if (argv[4].v_size != argsz[4]) | |
7512487e RK |
527 | goto out; |
528 | ||
4f6b8288 RK |
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)); | |
7512487e RK |
536 | if (IS_ERR(kbufs[4])) { |
537 | ret = PTR_ERR(kbufs[4]); | |
538 | goto out; | |
539 | } | |
4f6b8288 RK |
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 | ||
1cf58fa8 JS |
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 | ||
c083234f RK |
587 | if (ret < 0) |
588 | nilfs_remove_all_gcinode(nilfs); | |
1cf58fa8 | 589 | clear_nilfs_gc_running(nilfs); |
4f6b8288 | 590 | |
7512487e | 591 | out_free: |
d5046853 | 592 | while (--n >= 0) |
4f6b8288 RK |
593 | vfree(kbufs[n]); |
594 | kfree(kbufs[4]); | |
7512487e RK |
595 | out: |
596 | mnt_drop_write(filp->f_path.mnt); | |
4f6b8288 | 597 | return ret; |
7942b919 KS |
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; | |
0d561f12 | 605 | struct the_nilfs *nilfs; |
7942b919 KS |
606 | |
607 | ret = nilfs_construct_segment(inode->i_sb); | |
608 | if (ret < 0) | |
609 | return ret; | |
610 | ||
611 | if (argp != NULL) { | |
0d561f12 JS |
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); | |
7942b919 KS |
616 | if (copy_to_user(argp, &cno, sizeof(cno))) |
617 | return -EFAULT; | |
618 | } | |
619 | return 0; | |
620 | } | |
621 | ||
47eb6b9c RK |
622 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
623 | unsigned int cmd, void __user *argp, | |
83aca8f4 | 624 | size_t membsz, |
47eb6b9c RK |
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 | ||
003ff182 | 637 | if (argv.v_size < membsz) |
83aca8f4 RK |
638 | return -EINVAL; |
639 | ||
47eb6b9c RK |
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 | ||
7a946193 | 649 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
7942b919 | 650 | { |
7a946193 | 651 | struct inode *inode = filp->f_dentry->d_inode; |
75323400 | 652 | void __user *argp = (void __user *)arg; |
7942b919 KS |
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: | |
47eb6b9c | 660 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 661 | sizeof(struct nilfs_cpinfo), |
47eb6b9c | 662 | nilfs_ioctl_do_get_cpinfo); |
7942b919 KS |
663 | case NILFS_IOCTL_GET_CPSTAT: |
664 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); | |
665 | case NILFS_IOCTL_GET_SUINFO: | |
47eb6b9c | 666 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 667 | sizeof(struct nilfs_suinfo), |
47eb6b9c | 668 | nilfs_ioctl_do_get_suinfo); |
7942b919 KS |
669 | case NILFS_IOCTL_GET_SUSTAT: |
670 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); | |
671 | case NILFS_IOCTL_GET_VINFO: | |
47eb6b9c | 672 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 673 | sizeof(struct nilfs_vinfo), |
47eb6b9c | 674 | nilfs_ioctl_do_get_vinfo); |
7942b919 KS |
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); | |
7942b919 KS |
679 | case NILFS_IOCTL_SYNC: |
680 | return nilfs_ioctl_sync(inode, filp, cmd, argp); | |
681 | default: | |
682 | return -ENOTTY; | |
683 | } | |
684 | } |