xref: /openbmc/linux/fs/nilfs2/ioctl.c (revision fd848dc7)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * NILFS ioctl operations.
4  *
5  * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
6  *
7  * Written by Koji Sato.
8  */
9 
10 #include <linux/fs.h>
11 #include <linux/wait.h>
12 #include <linux/slab.h>
13 #include <linux/capability.h>	/* capable() */
14 #include <linux/uaccess.h>	/* copy_from_user(), copy_to_user() */
15 #include <linux/vmalloc.h>
16 #include <linux/compat.h>	/* compat_ptr() */
17 #include <linux/mount.h>	/* mnt_want_write_file(), mnt_drop_write_file() */
18 #include <linux/buffer_head.h>
19 #include <linux/fileattr.h>
20 #include "nilfs.h"
21 #include "segment.h"
22 #include "bmap.h"
23 #include "cpfile.h"
24 #include "sufile.h"
25 #include "dat.h"
26 
27 /**
28  * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
29  * @nilfs: nilfs object
30  * @argv: vector of arguments from userspace
31  * @dir: set of direction flags
32  * @dofunc: concrete function of get/set metadata info
33  *
34  * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
35  * calling dofunc() function on the basis of @argv argument.
36  *
37  * Return Value: On success, 0 is returned and requested metadata info
38  * is copied into userspace. On error, one of the following
39  * negative error codes is returned.
40  *
41  * %-EINVAL - Invalid arguments from userspace.
42  *
43  * %-ENOMEM - Insufficient amount of memory available.
44  *
45  * %-EFAULT - Failure during execution of requested operation.
46  */
nilfs_ioctl_wrap_copy(struct the_nilfs * nilfs,struct nilfs_argv * argv,int dir,ssize_t (* dofunc)(struct the_nilfs *,__u64 *,int,void *,size_t,size_t))47 static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
48 				 struct nilfs_argv *argv, int dir,
49 				 ssize_t (*dofunc)(struct the_nilfs *,
50 						   __u64 *, int,
51 						   void *, size_t, size_t))
52 {
53 	void *buf;
54 	void __user *base = (void __user *)(unsigned long)argv->v_base;
55 	size_t maxmembs, total, n;
56 	ssize_t nr;
57 	int ret, i;
58 	__u64 pos, ppos;
59 
60 	if (argv->v_nmembs == 0)
61 		return 0;
62 
63 	if ((size_t)argv->v_size > PAGE_SIZE)
64 		return -EINVAL;
65 
66 	/*
67 	 * Reject pairs of a start item position (argv->v_index) and a
68 	 * total count (argv->v_nmembs) which leads position 'pos' to
69 	 * overflow by the increment at the end of the loop.
70 	 */
71 	if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
72 		return -EINVAL;
73 
74 	buf = (void *)get_zeroed_page(GFP_NOFS);
75 	if (unlikely(!buf))
76 		return -ENOMEM;
77 	maxmembs = PAGE_SIZE / argv->v_size;
78 
79 	ret = 0;
80 	total = 0;
81 	pos = argv->v_index;
82 	for (i = 0; i < argv->v_nmembs; i += n) {
83 		n = (argv->v_nmembs - i < maxmembs) ?
84 			argv->v_nmembs - i : maxmembs;
85 		if ((dir & _IOC_WRITE) &&
86 		    copy_from_user(buf, base + argv->v_size * i,
87 				   argv->v_size * n)) {
88 			ret = -EFAULT;
89 			break;
90 		}
91 		ppos = pos;
92 		nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
93 			       n);
94 		if (nr < 0) {
95 			ret = nr;
96 			break;
97 		}
98 		if ((dir & _IOC_READ) &&
99 		    copy_to_user(base + argv->v_size * i, buf,
100 				 argv->v_size * nr)) {
101 			ret = -EFAULT;
102 			break;
103 		}
104 		total += nr;
105 		if ((size_t)nr < n)
106 			break;
107 		if (pos == ppos)
108 			pos += n;
109 	}
110 	argv->v_nmembs = total;
111 
112 	free_pages((unsigned long)buf, 0);
113 	return ret;
114 }
115 
116 /**
117  * nilfs_fileattr_get - ioctl to support lsattr
118  */
nilfs_fileattr_get(struct dentry * dentry,struct fileattr * fa)119 int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
120 {
121 	struct inode *inode = d_inode(dentry);
122 
123 	fileattr_fill_flags(fa, NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE);
124 
125 	return 0;
126 }
127 
128 /**
129  * nilfs_fileattr_set - ioctl to support chattr
130  */
nilfs_fileattr_set(struct mnt_idmap * idmap,struct dentry * dentry,struct fileattr * fa)131 int nilfs_fileattr_set(struct mnt_idmap *idmap,
132 		       struct dentry *dentry, struct fileattr *fa)
133 {
134 	struct inode *inode = d_inode(dentry);
135 	struct nilfs_transaction_info ti;
136 	unsigned int flags, oldflags;
137 	int ret;
138 
139 	if (fileattr_has_fsx(fa))
140 		return -EOPNOTSUPP;
141 
142 	flags = nilfs_mask_flags(inode->i_mode, fa->flags);
143 
144 	ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
145 	if (ret)
146 		return ret;
147 
148 	oldflags = NILFS_I(inode)->i_flags & ~FS_FL_USER_MODIFIABLE;
149 	NILFS_I(inode)->i_flags = oldflags | (flags & FS_FL_USER_MODIFIABLE);
150 
151 	nilfs_set_inode_flags(inode);
152 	inode_set_ctime_current(inode);
153 	if (IS_SYNC(inode))
154 		nilfs_set_transaction_flag(NILFS_TI_SYNC);
155 
156 	nilfs_mark_inode_dirty(inode);
157 	return nilfs_transaction_commit(inode->i_sb);
158 }
159 
160 /**
161  * nilfs_ioctl_getversion - get info about a file's version (generation number)
162  */
nilfs_ioctl_getversion(struct inode * inode,void __user * argp)163 static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
164 {
165 	return put_user(inode->i_generation, (int __user *)argp);
166 }
167 
168 /**
169  * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
170  * @inode: inode object
171  * @filp: file object
172  * @cmd: ioctl's request code
173  * @argp: pointer on argument from userspace
174  *
175  * Description: nilfs_ioctl_change_cpmode() function changes mode of
176  * given checkpoint between checkpoint and snapshot state. This ioctl
177  * is used in chcp and mkcp utilities.
178  *
179  * Return Value: On success, 0 is returned and mode of a checkpoint is
180  * changed. On error, one of the following negative error codes
181  * is returned.
182  *
183  * %-EPERM - Operation not permitted.
184  *
185  * %-EFAULT - Failure during checkpoint mode changing.
186  */
nilfs_ioctl_change_cpmode(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)187 static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
188 				     unsigned int cmd, void __user *argp)
189 {
190 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
191 	struct nilfs_transaction_info ti;
192 	struct nilfs_cpmode cpmode;
193 	int ret;
194 
195 	if (!capable(CAP_SYS_ADMIN))
196 		return -EPERM;
197 
198 	ret = mnt_want_write_file(filp);
199 	if (ret)
200 		return ret;
201 
202 	ret = -EFAULT;
203 	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
204 		goto out;
205 
206 	mutex_lock(&nilfs->ns_snapshot_mount_mutex);
207 
208 	nilfs_transaction_begin(inode->i_sb, &ti, 0);
209 	ret = nilfs_cpfile_change_cpmode(
210 		nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
211 	if (unlikely(ret < 0))
212 		nilfs_transaction_abort(inode->i_sb);
213 	else
214 		nilfs_transaction_commit(inode->i_sb); /* never fails */
215 
216 	mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
217 out:
218 	mnt_drop_write_file(filp);
219 	return ret;
220 }
221 
222 /**
223  * nilfs_ioctl_delete_checkpoint - remove checkpoint
224  * @inode: inode object
225  * @filp: file object
226  * @cmd: ioctl's request code
227  * @argp: pointer on argument from userspace
228  *
229  * Description: nilfs_ioctl_delete_checkpoint() function removes
230  * checkpoint from NILFS2 file system. This ioctl is used in rmcp
231  * utility.
232  *
233  * Return Value: On success, 0 is returned and a checkpoint is
234  * removed. On error, one of the following negative error codes
235  * is returned.
236  *
237  * %-EPERM - Operation not permitted.
238  *
239  * %-EFAULT - Failure during checkpoint removing.
240  */
241 static int
nilfs_ioctl_delete_checkpoint(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)242 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
243 			      unsigned int cmd, void __user *argp)
244 {
245 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
246 	struct nilfs_transaction_info ti;
247 	__u64 cno;
248 	int ret;
249 
250 	if (!capable(CAP_SYS_ADMIN))
251 		return -EPERM;
252 
253 	ret = mnt_want_write_file(filp);
254 	if (ret)
255 		return ret;
256 
257 	ret = -EFAULT;
258 	if (copy_from_user(&cno, argp, sizeof(cno)))
259 		goto out;
260 
261 	nilfs_transaction_begin(inode->i_sb, &ti, 0);
262 	ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
263 	if (unlikely(ret < 0))
264 		nilfs_transaction_abort(inode->i_sb);
265 	else
266 		nilfs_transaction_commit(inode->i_sb); /* never fails */
267 out:
268 	mnt_drop_write_file(filp);
269 	return ret;
270 }
271 
272 /**
273  * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
274  * @nilfs: nilfs object
275  * @posp: pointer on array of checkpoint's numbers
276  * @flags: checkpoint mode (checkpoint or snapshot)
277  * @buf: buffer for storing checkponts' info
278  * @size: size in bytes of one checkpoint info item in array
279  * @nmembs: number of checkpoints in array (numbers and infos)
280  *
281  * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
282  * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
283  * lscp utility and by nilfs_cleanerd daemon.
284  *
285  * Return value: count of nilfs_cpinfo structures in output buffer.
286  */
287 static ssize_t
nilfs_ioctl_do_get_cpinfo(struct the_nilfs * nilfs,__u64 * posp,int flags,void * buf,size_t size,size_t nmembs)288 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
289 			  void *buf, size_t size, size_t nmembs)
290 {
291 	int ret;
292 
293 	down_read(&nilfs->ns_segctor_sem);
294 	ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
295 				      size, nmembs);
296 	up_read(&nilfs->ns_segctor_sem);
297 	return ret;
298 }
299 
300 /**
301  * nilfs_ioctl_get_cpstat - get checkpoints statistics
302  * @inode: inode object
303  * @filp: file object
304  * @cmd: ioctl's request code
305  * @argp: pointer on argument from userspace
306  *
307  * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
308  * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
309  * and by nilfs_cleanerd daemon.
310  *
311  * Return Value: On success, 0 is returned, and checkpoints information is
312  * copied into userspace pointer @argp. On error, one of the following
313  * negative error codes is returned.
314  *
315  * %-EIO - I/O error.
316  *
317  * %-ENOMEM - Insufficient amount of memory available.
318  *
319  * %-EFAULT - Failure during getting checkpoints statistics.
320  */
nilfs_ioctl_get_cpstat(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)321 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
322 				  unsigned int cmd, void __user *argp)
323 {
324 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
325 	struct nilfs_cpstat cpstat;
326 	int ret;
327 
328 	down_read(&nilfs->ns_segctor_sem);
329 	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
330 	up_read(&nilfs->ns_segctor_sem);
331 	if (ret < 0)
332 		return ret;
333 
334 	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
335 		ret = -EFAULT;
336 	return ret;
337 }
338 
339 /**
340  * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
341  * @nilfs: nilfs object
342  * @posp: pointer on array of segment numbers
343  * @flags: *not used*
344  * @buf: buffer for storing suinfo array
345  * @size: size in bytes of one suinfo item in array
346  * @nmembs: count of segment numbers and suinfos in array
347  *
348  * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
349  * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
350  * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
351  *
352  * Return value: count of nilfs_suinfo structures in output buffer.
353  */
354 static ssize_t
nilfs_ioctl_do_get_suinfo(struct the_nilfs * nilfs,__u64 * posp,int flags,void * buf,size_t size,size_t nmembs)355 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
356 			  void *buf, size_t size, size_t nmembs)
357 {
358 	int ret;
359 
360 	down_read(&nilfs->ns_segctor_sem);
361 	ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
362 				      nmembs);
363 	up_read(&nilfs->ns_segctor_sem);
364 	return ret;
365 }
366 
367 /**
368  * nilfs_ioctl_get_sustat - get segment usage statistics
369  * @inode: inode object
370  * @filp: file object
371  * @cmd: ioctl's request code
372  * @argp: pointer on argument from userspace
373  *
374  * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
375  * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
376  * and by nilfs_cleanerd daemon.
377  *
378  * Return Value: On success, 0 is returned, and segment usage information is
379  * copied into userspace pointer @argp. On error, one of the following
380  * negative error codes is returned.
381  *
382  * %-EIO - I/O error.
383  *
384  * %-ENOMEM - Insufficient amount of memory available.
385  *
386  * %-EFAULT - Failure during getting segment usage statistics.
387  */
nilfs_ioctl_get_sustat(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)388 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
389 				  unsigned int cmd, void __user *argp)
390 {
391 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
392 	struct nilfs_sustat sustat;
393 	int ret;
394 
395 	down_read(&nilfs->ns_segctor_sem);
396 	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
397 	up_read(&nilfs->ns_segctor_sem);
398 	if (ret < 0)
399 		return ret;
400 
401 	if (copy_to_user(argp, &sustat, sizeof(sustat)))
402 		ret = -EFAULT;
403 	return ret;
404 }
405 
406 /**
407  * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
408  * @nilfs: nilfs object
409  * @posp: *not used*
410  * @flags: *not used*
411  * @buf: buffer for storing array of nilfs_vinfo structures
412  * @size: size in bytes of one vinfo item in array
413  * @nmembs: count of vinfos in array
414  *
415  * Description: nilfs_ioctl_do_get_vinfo() function returns information
416  * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
417  * by nilfs_cleanerd daemon.
418  *
419  * Return value: count of nilfs_vinfo structures in output buffer.
420  */
421 static ssize_t
nilfs_ioctl_do_get_vinfo(struct the_nilfs * nilfs,__u64 * posp,int flags,void * buf,size_t size,size_t nmembs)422 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
423 			 void *buf, size_t size, size_t nmembs)
424 {
425 	int ret;
426 
427 	down_read(&nilfs->ns_segctor_sem);
428 	ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
429 	up_read(&nilfs->ns_segctor_sem);
430 	return ret;
431 }
432 
433 /**
434  * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
435  * @nilfs: nilfs object
436  * @posp: *not used*
437  * @flags: *not used*
438  * @buf: buffer for storing array of nilfs_bdesc structures
439  * @size: size in bytes of one bdesc item in array
440  * @nmembs: count of bdescs in array
441  *
442  * Description: nilfs_ioctl_do_get_bdescs() function returns information
443  * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
444  * is used by nilfs_cleanerd daemon.
445  *
446  * Return value: count of nilfs_bdescs structures in output buffer.
447  */
448 static ssize_t
nilfs_ioctl_do_get_bdescs(struct the_nilfs * nilfs,__u64 * posp,int flags,void * buf,size_t size,size_t nmembs)449 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
450 			  void *buf, size_t size, size_t nmembs)
451 {
452 	struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
453 	struct nilfs_bdesc *bdescs = buf;
454 	int ret, i;
455 
456 	down_read(&nilfs->ns_segctor_sem);
457 	for (i = 0; i < nmembs; i++) {
458 		ret = nilfs_bmap_lookup_at_level(bmap,
459 						 bdescs[i].bd_offset,
460 						 bdescs[i].bd_level + 1,
461 						 &bdescs[i].bd_blocknr);
462 		if (ret < 0) {
463 			if (ret != -ENOENT) {
464 				up_read(&nilfs->ns_segctor_sem);
465 				return ret;
466 			}
467 			bdescs[i].bd_blocknr = 0;
468 		}
469 	}
470 	up_read(&nilfs->ns_segctor_sem);
471 	return nmembs;
472 }
473 
474 /**
475  * nilfs_ioctl_get_bdescs - get disk block descriptors
476  * @inode: inode object
477  * @filp: file object
478  * @cmd: ioctl's request code
479  * @argp: pointer on argument from userspace
480  *
481  * Description: nilfs_ioctl_do_get_bdescs() function returns information
482  * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
483  * is used by nilfs_cleanerd daemon.
484  *
485  * Return Value: On success, 0 is returned, and disk block descriptors are
486  * copied into userspace pointer @argp. On error, one of the following
487  * negative error codes is returned.
488  *
489  * %-EINVAL - Invalid arguments from userspace.
490  *
491  * %-EIO - I/O error.
492  *
493  * %-ENOMEM - Insufficient amount of memory available.
494  *
495  * %-EFAULT - Failure during getting disk block descriptors.
496  */
nilfs_ioctl_get_bdescs(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)497 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
498 				  unsigned int cmd, void __user *argp)
499 {
500 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
501 	struct nilfs_argv argv;
502 	int ret;
503 
504 	if (copy_from_user(&argv, argp, sizeof(argv)))
505 		return -EFAULT;
506 
507 	if (argv.v_size != sizeof(struct nilfs_bdesc))
508 		return -EINVAL;
509 
510 	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
511 				    nilfs_ioctl_do_get_bdescs);
512 	if (ret < 0)
513 		return ret;
514 
515 	if (copy_to_user(argp, &argv, sizeof(argv)))
516 		ret = -EFAULT;
517 	return ret;
518 }
519 
520 /**
521  * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
522  * @inode: inode object
523  * @vdesc: descriptor of virtual block number
524  * @buffers: list of moving buffers
525  *
526  * Description: nilfs_ioctl_move_inode_block() function registers data/node
527  * buffer in the GC pagecache and submit read request.
528  *
529  * Return Value: On success, 0 is returned. On error, one of the following
530  * negative error codes is returned.
531  *
532  * %-EIO - I/O error.
533  *
534  * %-ENOMEM - Insufficient amount of memory available.
535  *
536  * %-ENOENT - Requested block doesn't exist.
537  *
538  * %-EEXIST - Blocks conflict is detected.
539  */
nilfs_ioctl_move_inode_block(struct inode * inode,struct nilfs_vdesc * vdesc,struct list_head * buffers)540 static int nilfs_ioctl_move_inode_block(struct inode *inode,
541 					struct nilfs_vdesc *vdesc,
542 					struct list_head *buffers)
543 {
544 	struct buffer_head *bh;
545 	int ret;
546 
547 	if (vdesc->vd_flags == 0)
548 		ret = nilfs_gccache_submit_read_data(
549 			inode, vdesc->vd_offset, vdesc->vd_blocknr,
550 			vdesc->vd_vblocknr, &bh);
551 	else
552 		ret = nilfs_gccache_submit_read_node(
553 			inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
554 
555 	if (unlikely(ret < 0)) {
556 		if (ret == -ENOENT)
557 			nilfs_crit(inode->i_sb,
558 				   "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
559 				   __func__, vdesc->vd_flags ? "node" : "data",
560 				   (unsigned long long)vdesc->vd_ino,
561 				   (unsigned long long)vdesc->vd_cno,
562 				   (unsigned long long)vdesc->vd_offset,
563 				   (unsigned long long)vdesc->vd_blocknr,
564 				   (unsigned long long)vdesc->vd_vblocknr);
565 		return ret;
566 	}
567 	if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
568 		nilfs_crit(inode->i_sb,
569 			   "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
570 			   __func__, vdesc->vd_flags ? "node" : "data",
571 			   (unsigned long long)vdesc->vd_ino,
572 			   (unsigned long long)vdesc->vd_cno,
573 			   (unsigned long long)vdesc->vd_offset,
574 			   (unsigned long long)vdesc->vd_blocknr,
575 			   (unsigned long long)vdesc->vd_vblocknr);
576 		brelse(bh);
577 		return -EEXIST;
578 	}
579 	list_add_tail(&bh->b_assoc_buffers, buffers);
580 	return 0;
581 }
582 
583 /**
584  * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
585  * @sb: superblock object
586  * @argv: vector of arguments from userspace
587  * @buf: array of nilfs_vdesc structures
588  *
589  * Description: nilfs_ioctl_move_blocks() function reads valid data/node
590  * blocks that garbage collector specified with the array of nilfs_vdesc
591  * structures and stores them into page caches of GC inodes.
592  *
593  * Return Value: Number of processed nilfs_vdesc structures or
594  * error code, otherwise.
595  */
nilfs_ioctl_move_blocks(struct super_block * sb,struct nilfs_argv * argv,void * buf)596 static int nilfs_ioctl_move_blocks(struct super_block *sb,
597 				   struct nilfs_argv *argv, void *buf)
598 {
599 	size_t nmembs = argv->v_nmembs;
600 	struct the_nilfs *nilfs = sb->s_fs_info;
601 	struct inode *inode;
602 	struct nilfs_vdesc *vdesc;
603 	struct buffer_head *bh, *n;
604 	LIST_HEAD(buffers);
605 	ino_t ino;
606 	__u64 cno;
607 	int i, ret;
608 
609 	for (i = 0, vdesc = buf; i < nmembs; ) {
610 		ino = vdesc->vd_ino;
611 		cno = vdesc->vd_cno;
612 		inode = nilfs_iget_for_gc(sb, ino, cno);
613 		if (IS_ERR(inode)) {
614 			ret = PTR_ERR(inode);
615 			goto failed;
616 		}
617 		if (list_empty(&NILFS_I(inode)->i_dirty)) {
618 			/*
619 			 * Add the inode to GC inode list. Garbage Collection
620 			 * is serialized and no two processes manipulate the
621 			 * list simultaneously.
622 			 */
623 			igrab(inode);
624 			list_add(&NILFS_I(inode)->i_dirty,
625 				 &nilfs->ns_gc_inodes);
626 		}
627 
628 		do {
629 			ret = nilfs_ioctl_move_inode_block(inode, vdesc,
630 							   &buffers);
631 			if (unlikely(ret < 0)) {
632 				iput(inode);
633 				goto failed;
634 			}
635 			vdesc++;
636 		} while (++i < nmembs &&
637 			 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
638 
639 		iput(inode); /* The inode still remains in GC inode list */
640 	}
641 
642 	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
643 		ret = nilfs_gccache_wait_and_mark_dirty(bh);
644 		if (unlikely(ret < 0)) {
645 			WARN_ON(ret == -EEXIST);
646 			goto failed;
647 		}
648 		list_del_init(&bh->b_assoc_buffers);
649 		brelse(bh);
650 	}
651 	return nmembs;
652 
653  failed:
654 	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
655 		list_del_init(&bh->b_assoc_buffers);
656 		brelse(bh);
657 	}
658 	return ret;
659 }
660 
661 /**
662  * nilfs_ioctl_delete_checkpoints - delete checkpoints
663  * @nilfs: nilfs object
664  * @argv: vector of arguments from userspace
665  * @buf: array of periods of checkpoints numbers
666  *
667  * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
668  * in the period from p_start to p_end, excluding p_end itself. The checkpoints
669  * which have been already deleted are ignored.
670  *
671  * Return Value: Number of processed nilfs_period structures or
672  * error code, otherwise.
673  *
674  * %-EIO - I/O error.
675  *
676  * %-ENOMEM - Insufficient amount of memory available.
677  *
678  * %-EINVAL - invalid checkpoints.
679  */
nilfs_ioctl_delete_checkpoints(struct the_nilfs * nilfs,struct nilfs_argv * argv,void * buf)680 static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
681 					  struct nilfs_argv *argv, void *buf)
682 {
683 	size_t nmembs = argv->v_nmembs;
684 	struct inode *cpfile = nilfs->ns_cpfile;
685 	struct nilfs_period *periods = buf;
686 	int ret, i;
687 
688 	for (i = 0; i < nmembs; i++) {
689 		ret = nilfs_cpfile_delete_checkpoints(
690 			cpfile, periods[i].p_start, periods[i].p_end);
691 		if (ret < 0)
692 			return ret;
693 	}
694 	return nmembs;
695 }
696 
697 /**
698  * nilfs_ioctl_free_vblocknrs - free virtual block numbers
699  * @nilfs: nilfs object
700  * @argv: vector of arguments from userspace
701  * @buf: array of virtual block numbers
702  *
703  * Description: nilfs_ioctl_free_vblocknrs() function frees
704  * the virtual block numbers specified by @buf and @argv->v_nmembs.
705  *
706  * Return Value: Number of processed virtual block numbers or
707  * error code, otherwise.
708  *
709  * %-EIO - I/O error.
710  *
711  * %-ENOMEM - Insufficient amount of memory available.
712  *
713  * %-ENOENT - The virtual block number have not been allocated.
714  */
nilfs_ioctl_free_vblocknrs(struct the_nilfs * nilfs,struct nilfs_argv * argv,void * buf)715 static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
716 				      struct nilfs_argv *argv, void *buf)
717 {
718 	size_t nmembs = argv->v_nmembs;
719 	int ret;
720 
721 	ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
722 
723 	return (ret < 0) ? ret : nmembs;
724 }
725 
726 /**
727  * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
728  * @nilfs: nilfs object
729  * @argv: vector of arguments from userspace
730  * @buf: array of block descriptors
731  *
732  * Description: nilfs_ioctl_mark_blocks_dirty() function marks
733  * metadata file or data blocks as dirty.
734  *
735  * Return Value: Number of processed block descriptors or
736  * error code, otherwise.
737  *
738  * %-ENOMEM - Insufficient memory available.
739  *
740  * %-EIO - I/O error
741  *
742  * %-ENOENT - the specified block does not exist (hole block)
743  */
nilfs_ioctl_mark_blocks_dirty(struct the_nilfs * nilfs,struct nilfs_argv * argv,void * buf)744 static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
745 					 struct nilfs_argv *argv, void *buf)
746 {
747 	size_t nmembs = argv->v_nmembs;
748 	struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
749 	struct nilfs_bdesc *bdescs = buf;
750 	struct buffer_head *bh;
751 	int ret, i;
752 
753 	for (i = 0; i < nmembs; i++) {
754 		/* XXX: use macro or inline func to check liveness */
755 		ret = nilfs_bmap_lookup_at_level(bmap,
756 						 bdescs[i].bd_offset,
757 						 bdescs[i].bd_level + 1,
758 						 &bdescs[i].bd_blocknr);
759 		if (ret < 0) {
760 			if (ret != -ENOENT)
761 				return ret;
762 			bdescs[i].bd_blocknr = 0;
763 		}
764 		if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
765 			/* skip dead block */
766 			continue;
767 		if (bdescs[i].bd_level == 0) {
768 			ret = nilfs_mdt_get_block(nilfs->ns_dat,
769 						  bdescs[i].bd_offset,
770 						  false, NULL, &bh);
771 			if (unlikely(ret)) {
772 				WARN_ON(ret == -ENOENT);
773 				return ret;
774 			}
775 			mark_buffer_dirty(bh);
776 			nilfs_mdt_mark_dirty(nilfs->ns_dat);
777 			put_bh(bh);
778 		} else {
779 			ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
780 					      bdescs[i].bd_level);
781 			if (ret < 0) {
782 				WARN_ON(ret == -ENOENT);
783 				return ret;
784 			}
785 		}
786 	}
787 	return nmembs;
788 }
789 
nilfs_ioctl_prepare_clean_segments(struct the_nilfs * nilfs,struct nilfs_argv * argv,void ** kbufs)790 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
791 				       struct nilfs_argv *argv, void **kbufs)
792 {
793 	const char *msg;
794 	int ret;
795 
796 	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
797 	if (ret < 0) {
798 		/*
799 		 * can safely abort because checkpoints can be removed
800 		 * independently.
801 		 */
802 		msg = "cannot delete checkpoints";
803 		goto failed;
804 	}
805 	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
806 	if (ret < 0) {
807 		/*
808 		 * can safely abort because DAT file is updated atomically
809 		 * using a copy-on-write technique.
810 		 */
811 		msg = "cannot delete virtual blocks from DAT file";
812 		goto failed;
813 	}
814 	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
815 	if (ret < 0) {
816 		/*
817 		 * can safely abort because the operation is nondestructive.
818 		 */
819 		msg = "cannot mark copying blocks dirty";
820 		goto failed;
821 	}
822 	return 0;
823 
824  failed:
825 	nilfs_err(nilfs->ns_sb, "error %d preparing GC: %s", ret, msg);
826 	return ret;
827 }
828 
829 /**
830  * nilfs_ioctl_clean_segments - clean segments
831  * @inode: inode object
832  * @filp: file object
833  * @cmd: ioctl's request code
834  * @argp: pointer on argument from userspace
835  *
836  * Description: nilfs_ioctl_clean_segments() function makes garbage
837  * collection operation in the environment of requested parameters
838  * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
839  * nilfs_cleanerd daemon.
840  *
841  * Return Value: On success, 0 is returned or error code, otherwise.
842  */
nilfs_ioctl_clean_segments(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)843 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
844 				      unsigned int cmd, void __user *argp)
845 {
846 	struct nilfs_argv argv[5];
847 	static const size_t argsz[5] = {
848 		sizeof(struct nilfs_vdesc),
849 		sizeof(struct nilfs_period),
850 		sizeof(__u64),
851 		sizeof(struct nilfs_bdesc),
852 		sizeof(__u64),
853 	};
854 	void __user *base;
855 	void *kbufs[5];
856 	struct the_nilfs *nilfs;
857 	size_t len, nsegs;
858 	int n, ret;
859 
860 	if (!capable(CAP_SYS_ADMIN))
861 		return -EPERM;
862 
863 	ret = mnt_want_write_file(filp);
864 	if (ret)
865 		return ret;
866 
867 	ret = -EFAULT;
868 	if (copy_from_user(argv, argp, sizeof(argv)))
869 		goto out;
870 
871 	ret = -EINVAL;
872 	nsegs = argv[4].v_nmembs;
873 	if (argv[4].v_size != argsz[4])
874 		goto out;
875 	if (nsegs > UINT_MAX / sizeof(__u64))
876 		goto out;
877 
878 	/*
879 	 * argv[4] points to segment numbers this ioctl cleans.  We
880 	 * use kmalloc() for its buffer because memory used for the
881 	 * segment numbers is enough small.
882 	 */
883 	kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
884 			       nsegs * sizeof(__u64));
885 	if (IS_ERR(kbufs[4])) {
886 		ret = PTR_ERR(kbufs[4]);
887 		goto out;
888 	}
889 	nilfs = inode->i_sb->s_fs_info;
890 
891 	for (n = 0; n < 4; n++) {
892 		ret = -EINVAL;
893 		if (argv[n].v_size != argsz[n])
894 			goto out_free;
895 
896 		if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
897 			goto out_free;
898 
899 		if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
900 			goto out_free;
901 
902 		len = argv[n].v_size * argv[n].v_nmembs;
903 		base = (void __user *)(unsigned long)argv[n].v_base;
904 		if (len == 0) {
905 			kbufs[n] = NULL;
906 			continue;
907 		}
908 
909 		kbufs[n] = vmalloc(len);
910 		if (!kbufs[n]) {
911 			ret = -ENOMEM;
912 			goto out_free;
913 		}
914 		if (copy_from_user(kbufs[n], base, len)) {
915 			ret = -EFAULT;
916 			vfree(kbufs[n]);
917 			goto out_free;
918 		}
919 	}
920 
921 	/*
922 	 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
923 	 * which will operates an inode list without blocking.
924 	 * To protect the list from concurrent operations,
925 	 * nilfs_ioctl_move_blocks should be atomic operation.
926 	 */
927 	if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
928 		ret = -EBUSY;
929 		goto out_free;
930 	}
931 
932 	ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
933 	if (ret < 0) {
934 		nilfs_err(inode->i_sb,
935 			  "error %d preparing GC: cannot read source blocks",
936 			  ret);
937 	} else {
938 		if (nilfs_sb_need_update(nilfs))
939 			set_nilfs_discontinued(nilfs);
940 		ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
941 	}
942 
943 	nilfs_remove_all_gcinodes(nilfs);
944 	clear_nilfs_gc_running(nilfs);
945 
946 out_free:
947 	while (--n >= 0)
948 		vfree(kbufs[n]);
949 	kfree(kbufs[4]);
950 out:
951 	mnt_drop_write_file(filp);
952 	return ret;
953 }
954 
955 /**
956  * nilfs_ioctl_sync - make a checkpoint
957  * @inode: inode object
958  * @filp: file object
959  * @cmd: ioctl's request code
960  * @argp: pointer on argument from userspace
961  *
962  * Description: nilfs_ioctl_sync() function constructs a logical segment
963  * for checkpointing.  This function guarantees that all modified data
964  * and metadata are written out to the device when it successfully
965  * returned.
966  *
967  * Return Value: On success, 0 is retured. On errors, one of the following
968  * negative error code is returned.
969  *
970  * %-EROFS - Read only filesystem.
971  *
972  * %-EIO - I/O error
973  *
974  * %-ENOSPC - No space left on device (only in a panic state).
975  *
976  * %-ERESTARTSYS - Interrupted.
977  *
978  * %-ENOMEM - Insufficient memory available.
979  *
980  * %-EFAULT - Failure during execution of requested operation.
981  */
nilfs_ioctl_sync(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)982 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
983 			    unsigned int cmd, void __user *argp)
984 {
985 	__u64 cno;
986 	int ret;
987 	struct the_nilfs *nilfs;
988 
989 	ret = nilfs_construct_segment(inode->i_sb);
990 	if (ret < 0)
991 		return ret;
992 
993 	nilfs = inode->i_sb->s_fs_info;
994 	ret = nilfs_flush_device(nilfs);
995 	if (ret < 0)
996 		return ret;
997 
998 	if (argp != NULL) {
999 		down_read(&nilfs->ns_segctor_sem);
1000 		cno = nilfs->ns_cno - 1;
1001 		up_read(&nilfs->ns_segctor_sem);
1002 		if (copy_to_user(argp, &cno, sizeof(cno)))
1003 			return -EFAULT;
1004 	}
1005 	return 0;
1006 }
1007 
1008 /**
1009  * nilfs_ioctl_resize - resize NILFS2 volume
1010  * @inode: inode object
1011  * @filp: file object
1012  * @argp: pointer on argument from userspace
1013  *
1014  * Return Value: On success, 0 is returned or error code, otherwise.
1015  */
nilfs_ioctl_resize(struct inode * inode,struct file * filp,void __user * argp)1016 static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1017 			      void __user *argp)
1018 {
1019 	__u64 newsize;
1020 	int ret = -EPERM;
1021 
1022 	if (!capable(CAP_SYS_ADMIN))
1023 		goto out;
1024 
1025 	ret = mnt_want_write_file(filp);
1026 	if (ret)
1027 		goto out;
1028 
1029 	ret = -EFAULT;
1030 	if (copy_from_user(&newsize, argp, sizeof(newsize)))
1031 		goto out_drop_write;
1032 
1033 	ret = nilfs_resize_fs(inode->i_sb, newsize);
1034 
1035 out_drop_write:
1036 	mnt_drop_write_file(filp);
1037 out:
1038 	return ret;
1039 }
1040 
1041 /**
1042  * nilfs_ioctl_trim_fs() - trim ioctl handle function
1043  * @inode: inode object
1044  * @argp: pointer on argument from userspace
1045  *
1046  * Description: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1047  * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1048  * performs the actual trim operation.
1049  *
1050  * Return Value: On success, 0 is returned or negative error code, otherwise.
1051  */
nilfs_ioctl_trim_fs(struct inode * inode,void __user * argp)1052 static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1053 {
1054 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1055 	struct fstrim_range range;
1056 	int ret;
1057 
1058 	if (!capable(CAP_SYS_ADMIN))
1059 		return -EPERM;
1060 
1061 	if (!bdev_max_discard_sectors(nilfs->ns_bdev))
1062 		return -EOPNOTSUPP;
1063 
1064 	if (copy_from_user(&range, argp, sizeof(range)))
1065 		return -EFAULT;
1066 
1067 	range.minlen = max_t(u64, range.minlen,
1068 			     bdev_discard_granularity(nilfs->ns_bdev));
1069 
1070 	down_read(&nilfs->ns_segctor_sem);
1071 	ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1072 	up_read(&nilfs->ns_segctor_sem);
1073 
1074 	if (ret < 0)
1075 		return ret;
1076 
1077 	if (copy_to_user(argp, &range, sizeof(range)))
1078 		return -EFAULT;
1079 
1080 	return 0;
1081 }
1082 
1083 /**
1084  * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1085  * @inode: inode object
1086  * @argp: pointer on argument from userspace
1087  *
1088  * Description: nilfs_ioctl_set_alloc_range() function defines lower limit
1089  * of segments in bytes and upper limit of segments in bytes.
1090  * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1091  *
1092  * Return Value: On success, 0 is returned or error code, otherwise.
1093  */
nilfs_ioctl_set_alloc_range(struct inode * inode,void __user * argp)1094 static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1095 {
1096 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1097 	__u64 range[2];
1098 	__u64 minseg, maxseg;
1099 	unsigned long segbytes;
1100 	int ret = -EPERM;
1101 
1102 	if (!capable(CAP_SYS_ADMIN))
1103 		goto out;
1104 
1105 	ret = -EFAULT;
1106 	if (copy_from_user(range, argp, sizeof(__u64[2])))
1107 		goto out;
1108 
1109 	ret = -ERANGE;
1110 	if (range[1] > bdev_nr_bytes(inode->i_sb->s_bdev))
1111 		goto out;
1112 
1113 	segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1114 
1115 	minseg = range[0] + segbytes - 1;
1116 	do_div(minseg, segbytes);
1117 
1118 	if (range[1] < 4096)
1119 		goto out;
1120 
1121 	maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1122 	if (maxseg < segbytes)
1123 		goto out;
1124 
1125 	do_div(maxseg, segbytes);
1126 	maxseg--;
1127 
1128 	ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1129 out:
1130 	return ret;
1131 }
1132 
1133 /**
1134  * nilfs_ioctl_get_info - wrapping function of get metadata info
1135  * @inode: inode object
1136  * @filp: file object
1137  * @cmd: ioctl's request code
1138  * @argp: pointer on argument from userspace
1139  * @membsz: size of an item in bytes
1140  * @dofunc: concrete function of getting metadata info
1141  *
1142  * Description: nilfs_ioctl_get_info() gets metadata info by means of
1143  * calling dofunc() function.
1144  *
1145  * Return Value: On success, 0 is returned and requested metadata info
1146  * is copied into userspace. On error, one of the following
1147  * negative error codes is returned.
1148  *
1149  * %-EINVAL - Invalid arguments from userspace.
1150  *
1151  * %-ENOMEM - Insufficient amount of memory available.
1152  *
1153  * %-EFAULT - Failure during execution of requested operation.
1154  */
nilfs_ioctl_get_info(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp,size_t membsz,ssize_t (* dofunc)(struct the_nilfs *,__u64 *,int,void *,size_t,size_t))1155 static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1156 				unsigned int cmd, void __user *argp,
1157 				size_t membsz,
1158 				ssize_t (*dofunc)(struct the_nilfs *,
1159 						  __u64 *, int,
1160 						  void *, size_t, size_t))
1161 
1162 {
1163 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1164 	struct nilfs_argv argv;
1165 	int ret;
1166 
1167 	if (copy_from_user(&argv, argp, sizeof(argv)))
1168 		return -EFAULT;
1169 
1170 	if (argv.v_size < membsz)
1171 		return -EINVAL;
1172 
1173 	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1174 	if (ret < 0)
1175 		return ret;
1176 
1177 	if (copy_to_user(argp, &argv, sizeof(argv)))
1178 		ret = -EFAULT;
1179 	return ret;
1180 }
1181 
1182 /**
1183  * nilfs_ioctl_set_suinfo - set segment usage info
1184  * @inode: inode object
1185  * @filp: file object
1186  * @cmd: ioctl's request code
1187  * @argp: pointer on argument from userspace
1188  *
1189  * Description: Expects an array of nilfs_suinfo_update structures
1190  * encapsulated in nilfs_argv and updates the segment usage info
1191  * according to the flags in nilfs_suinfo_update.
1192  *
1193  * Return Value: On success, 0 is returned. On error, one of the
1194  * following negative error codes is returned.
1195  *
1196  * %-EPERM - Not enough permissions
1197  *
1198  * %-EFAULT - Error copying input data
1199  *
1200  * %-EIO - I/O error.
1201  *
1202  * %-ENOMEM - Insufficient amount of memory available.
1203  *
1204  * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1205  */
nilfs_ioctl_set_suinfo(struct inode * inode,struct file * filp,unsigned int cmd,void __user * argp)1206 static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1207 				unsigned int cmd, void __user *argp)
1208 {
1209 	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1210 	struct nilfs_transaction_info ti;
1211 	struct nilfs_argv argv;
1212 	size_t len;
1213 	void __user *base;
1214 	void *kbuf;
1215 	int ret;
1216 
1217 	if (!capable(CAP_SYS_ADMIN))
1218 		return -EPERM;
1219 
1220 	ret = mnt_want_write_file(filp);
1221 	if (ret)
1222 		return ret;
1223 
1224 	ret = -EFAULT;
1225 	if (copy_from_user(&argv, argp, sizeof(argv)))
1226 		goto out;
1227 
1228 	ret = -EINVAL;
1229 	if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1230 		goto out;
1231 
1232 	if (argv.v_nmembs > nilfs->ns_nsegments)
1233 		goto out;
1234 
1235 	if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1236 		goto out;
1237 
1238 	len = argv.v_size * argv.v_nmembs;
1239 	if (!len) {
1240 		ret = 0;
1241 		goto out;
1242 	}
1243 
1244 	base = (void __user *)(unsigned long)argv.v_base;
1245 	kbuf = vmalloc(len);
1246 	if (!kbuf) {
1247 		ret = -ENOMEM;
1248 		goto out;
1249 	}
1250 
1251 	if (copy_from_user(kbuf, base, len)) {
1252 		ret = -EFAULT;
1253 		goto out_free;
1254 	}
1255 
1256 	nilfs_transaction_begin(inode->i_sb, &ti, 0);
1257 	ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1258 			argv.v_nmembs);
1259 	if (unlikely(ret < 0))
1260 		nilfs_transaction_abort(inode->i_sb);
1261 	else
1262 		nilfs_transaction_commit(inode->i_sb); /* never fails */
1263 
1264 out_free:
1265 	vfree(kbuf);
1266 out:
1267 	mnt_drop_write_file(filp);
1268 	return ret;
1269 }
1270 
nilfs_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1271 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1272 {
1273 	struct inode *inode = file_inode(filp);
1274 	void __user *argp = (void __user *)arg;
1275 
1276 	switch (cmd) {
1277 	case FS_IOC_GETVERSION:
1278 		return nilfs_ioctl_getversion(inode, argp);
1279 	case NILFS_IOCTL_CHANGE_CPMODE:
1280 		return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1281 	case NILFS_IOCTL_DELETE_CHECKPOINT:
1282 		return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1283 	case NILFS_IOCTL_GET_CPINFO:
1284 		return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1285 					    sizeof(struct nilfs_cpinfo),
1286 					    nilfs_ioctl_do_get_cpinfo);
1287 	case NILFS_IOCTL_GET_CPSTAT:
1288 		return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1289 	case NILFS_IOCTL_GET_SUINFO:
1290 		return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1291 					    sizeof(struct nilfs_suinfo),
1292 					    nilfs_ioctl_do_get_suinfo);
1293 	case NILFS_IOCTL_SET_SUINFO:
1294 		return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
1295 	case NILFS_IOCTL_GET_SUSTAT:
1296 		return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1297 	case NILFS_IOCTL_GET_VINFO:
1298 		return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1299 					    sizeof(struct nilfs_vinfo),
1300 					    nilfs_ioctl_do_get_vinfo);
1301 	case NILFS_IOCTL_GET_BDESCS:
1302 		return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1303 	case NILFS_IOCTL_CLEAN_SEGMENTS:
1304 		return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
1305 	case NILFS_IOCTL_SYNC:
1306 		return nilfs_ioctl_sync(inode, filp, cmd, argp);
1307 	case NILFS_IOCTL_RESIZE:
1308 		return nilfs_ioctl_resize(inode, filp, argp);
1309 	case NILFS_IOCTL_SET_ALLOC_RANGE:
1310 		return nilfs_ioctl_set_alloc_range(inode, argp);
1311 	case FITRIM:
1312 		return nilfs_ioctl_trim_fs(inode, argp);
1313 	default:
1314 		return -ENOTTY;
1315 	}
1316 }
1317 
1318 #ifdef CONFIG_COMPAT
nilfs_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1319 long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1320 {
1321 	switch (cmd) {
1322 	case FS_IOC32_GETVERSION:
1323 		cmd = FS_IOC_GETVERSION;
1324 		break;
1325 	case NILFS_IOCTL_CHANGE_CPMODE:
1326 	case NILFS_IOCTL_DELETE_CHECKPOINT:
1327 	case NILFS_IOCTL_GET_CPINFO:
1328 	case NILFS_IOCTL_GET_CPSTAT:
1329 	case NILFS_IOCTL_GET_SUINFO:
1330 	case NILFS_IOCTL_SET_SUINFO:
1331 	case NILFS_IOCTL_GET_SUSTAT:
1332 	case NILFS_IOCTL_GET_VINFO:
1333 	case NILFS_IOCTL_GET_BDESCS:
1334 	case NILFS_IOCTL_CLEAN_SEGMENTS:
1335 	case NILFS_IOCTL_SYNC:
1336 	case NILFS_IOCTL_RESIZE:
1337 	case NILFS_IOCTL_SET_ALLOC_RANGE:
1338 	case FITRIM:
1339 		break;
1340 	default:
1341 		return -ENOIOCTLCMD;
1342 	}
1343 	return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1344 }
1345 #endif
1346