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xfs: simplify inode to transaction joining
[deliverable/linux.git] / fs / xfs / linux-2.6 / xfs_ioctl.c
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_bit.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_alloc.h"
27 #include "xfs_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_dinode.h"
30 #include "xfs_inode.h"
31 #include "xfs_ioctl.h"
32 #include "xfs_rtalloc.h"
33 #include "xfs_itable.h"
34 #include "xfs_error.h"
35 #include "xfs_attr.h"
36 #include "xfs_bmap.h"
37 #include "xfs_buf_item.h"
38 #include "xfs_utils.h"
39 #include "xfs_dfrag.h"
40 #include "xfs_fsops.h"
41 #include "xfs_vnodeops.h"
42 #include "xfs_quota.h"
43 #include "xfs_inode_item.h"
44 #include "xfs_export.h"
45 #include "xfs_trace.h"
46
47 #include <linux/capability.h>
48 #include <linux/dcache.h>
49 #include <linux/mount.h>
50 #include <linux/namei.h>
51 #include <linux/pagemap.h>
52 #include <linux/slab.h>
53 #include <linux/exportfs.h>
54
55 /*
56 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
57 * a file or fs handle.
58 *
59 * XFS_IOC_PATH_TO_FSHANDLE
60 * returns fs handle for a mount point or path within that mount point
61 * XFS_IOC_FD_TO_HANDLE
62 * returns full handle for a FD opened in user space
63 * XFS_IOC_PATH_TO_HANDLE
64 * returns full handle for a path
65 */
66 int
67 xfs_find_handle(
68 unsigned int cmd,
69 xfs_fsop_handlereq_t *hreq)
70 {
71 int hsize;
72 xfs_handle_t handle;
73 struct inode *inode;
74 struct file *file = NULL;
75 struct path path;
76 int error;
77 struct xfs_inode *ip;
78
79 if (cmd == XFS_IOC_FD_TO_HANDLE) {
80 file = fget(hreq->fd);
81 if (!file)
82 return -EBADF;
83 inode = file->f_path.dentry->d_inode;
84 } else {
85 error = user_lpath((const char __user *)hreq->path, &path);
86 if (error)
87 return error;
88 inode = path.dentry->d_inode;
89 }
90 ip = XFS_I(inode);
91
92 /*
93 * We can only generate handles for inodes residing on a XFS filesystem,
94 * and only for regular files, directories or symbolic links.
95 */
96 error = -EINVAL;
97 if (inode->i_sb->s_magic != XFS_SB_MAGIC)
98 goto out_put;
99
100 error = -EBADF;
101 if (!S_ISREG(inode->i_mode) &&
102 !S_ISDIR(inode->i_mode) &&
103 !S_ISLNK(inode->i_mode))
104 goto out_put;
105
106
107 memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));
108
109 if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
110 /*
111 * This handle only contains an fsid, zero the rest.
112 */
113 memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
114 hsize = sizeof(xfs_fsid_t);
115 } else {
116 int lock_mode;
117
118 lock_mode = xfs_ilock_map_shared(ip);
119 handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
120 sizeof(handle.ha_fid.fid_len);
121 handle.ha_fid.fid_pad = 0;
122 handle.ha_fid.fid_gen = ip->i_d.di_gen;
123 handle.ha_fid.fid_ino = ip->i_ino;
124 xfs_iunlock_map_shared(ip, lock_mode);
125
126 hsize = XFS_HSIZE(handle);
127 }
128
129 error = -EFAULT;
130 if (copy_to_user(hreq->ohandle, &handle, hsize) ||
131 copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
132 goto out_put;
133
134 error = 0;
135
136 out_put:
137 if (cmd == XFS_IOC_FD_TO_HANDLE)
138 fput(file);
139 else
140 path_put(&path);
141 return error;
142 }
143
144 /*
145 * No need to do permission checks on the various pathname components
146 * as the handle operations are privileged.
147 */
148 STATIC int
149 xfs_handle_acceptable(
150 void *context,
151 struct dentry *dentry)
152 {
153 return 1;
154 }
155
156 /*
157 * Convert userspace handle data into a dentry.
158 */
159 struct dentry *
160 xfs_handle_to_dentry(
161 struct file *parfilp,
162 void __user *uhandle,
163 u32 hlen)
164 {
165 xfs_handle_t handle;
166 struct xfs_fid64 fid;
167
168 /*
169 * Only allow handle opens under a directory.
170 */
171 if (!S_ISDIR(parfilp->f_path.dentry->d_inode->i_mode))
172 return ERR_PTR(-ENOTDIR);
173
174 if (hlen != sizeof(xfs_handle_t))
175 return ERR_PTR(-EINVAL);
176 if (copy_from_user(&handle, uhandle, hlen))
177 return ERR_PTR(-EFAULT);
178 if (handle.ha_fid.fid_len !=
179 sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
180 return ERR_PTR(-EINVAL);
181
182 memset(&fid, 0, sizeof(struct fid));
183 fid.ino = handle.ha_fid.fid_ino;
184 fid.gen = handle.ha_fid.fid_gen;
185
186 return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
187 FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
188 xfs_handle_acceptable, NULL);
189 }
190
191 STATIC struct dentry *
192 xfs_handlereq_to_dentry(
193 struct file *parfilp,
194 xfs_fsop_handlereq_t *hreq)
195 {
196 return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
197 }
198
199 int
200 xfs_open_by_handle(
201 struct file *parfilp,
202 xfs_fsop_handlereq_t *hreq)
203 {
204 const struct cred *cred = current_cred();
205 int error;
206 int fd;
207 int permflag;
208 struct file *filp;
209 struct inode *inode;
210 struct dentry *dentry;
211
212 if (!capable(CAP_SYS_ADMIN))
213 return -XFS_ERROR(EPERM);
214
215 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
216 if (IS_ERR(dentry))
217 return PTR_ERR(dentry);
218 inode = dentry->d_inode;
219
220 /* Restrict xfs_open_by_handle to directories & regular files. */
221 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
222 error = -XFS_ERROR(EPERM);
223 goto out_dput;
224 }
225
226 #if BITS_PER_LONG != 32
227 hreq->oflags |= O_LARGEFILE;
228 #endif
229
230 /* Put open permission in namei format. */
231 permflag = hreq->oflags;
232 if ((permflag+1) & O_ACCMODE)
233 permflag++;
234 if (permflag & O_TRUNC)
235 permflag |= 2;
236
237 if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
238 (permflag & FMODE_WRITE) && IS_APPEND(inode)) {
239 error = -XFS_ERROR(EPERM);
240 goto out_dput;
241 }
242
243 if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
244 error = -XFS_ERROR(EACCES);
245 goto out_dput;
246 }
247
248 /* Can't write directories. */
249 if (S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
250 error = -XFS_ERROR(EISDIR);
251 goto out_dput;
252 }
253
254 fd = get_unused_fd();
255 if (fd < 0) {
256 error = fd;
257 goto out_dput;
258 }
259
260 filp = dentry_open(dentry, mntget(parfilp->f_path.mnt),
261 hreq->oflags, cred);
262 if (IS_ERR(filp)) {
263 put_unused_fd(fd);
264 return PTR_ERR(filp);
265 }
266
267 if (inode->i_mode & S_IFREG) {
268 filp->f_flags |= O_NOATIME;
269 filp->f_mode |= FMODE_NOCMTIME;
270 }
271
272 fd_install(fd, filp);
273 return fd;
274
275 out_dput:
276 dput(dentry);
277 return error;
278 }
279
280 /*
281 * This is a copy from fs/namei.c:vfs_readlink(), except for removing it's
282 * unused first argument.
283 */
284 STATIC int
285 do_readlink(
286 char __user *buffer,
287 int buflen,
288 const char *link)
289 {
290 int len;
291
292 len = PTR_ERR(link);
293 if (IS_ERR(link))
294 goto out;
295
296 len = strlen(link);
297 if (len > (unsigned) buflen)
298 len = buflen;
299 if (copy_to_user(buffer, link, len))
300 len = -EFAULT;
301 out:
302 return len;
303 }
304
305
306 int
307 xfs_readlink_by_handle(
308 struct file *parfilp,
309 xfs_fsop_handlereq_t *hreq)
310 {
311 struct dentry *dentry;
312 __u32 olen;
313 void *link;
314 int error;
315
316 if (!capable(CAP_SYS_ADMIN))
317 return -XFS_ERROR(EPERM);
318
319 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
320 if (IS_ERR(dentry))
321 return PTR_ERR(dentry);
322
323 /* Restrict this handle operation to symlinks only. */
324 if (!S_ISLNK(dentry->d_inode->i_mode)) {
325 error = -XFS_ERROR(EINVAL);
326 goto out_dput;
327 }
328
329 if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
330 error = -XFS_ERROR(EFAULT);
331 goto out_dput;
332 }
333
334 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
335 if (!link) {
336 error = -XFS_ERROR(ENOMEM);
337 goto out_dput;
338 }
339
340 error = -xfs_readlink(XFS_I(dentry->d_inode), link);
341 if (error)
342 goto out_kfree;
343 error = do_readlink(hreq->ohandle, olen, link);
344 if (error)
345 goto out_kfree;
346
347 out_kfree:
348 kfree(link);
349 out_dput:
350 dput(dentry);
351 return error;
352 }
353
354 STATIC int
355 xfs_fssetdm_by_handle(
356 struct file *parfilp,
357 void __user *arg)
358 {
359 int error;
360 struct fsdmidata fsd;
361 xfs_fsop_setdm_handlereq_t dmhreq;
362 struct dentry *dentry;
363
364 if (!capable(CAP_MKNOD))
365 return -XFS_ERROR(EPERM);
366 if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
367 return -XFS_ERROR(EFAULT);
368
369 dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
370 if (IS_ERR(dentry))
371 return PTR_ERR(dentry);
372
373 if (IS_IMMUTABLE(dentry->d_inode) || IS_APPEND(dentry->d_inode)) {
374 error = -XFS_ERROR(EPERM);
375 goto out;
376 }
377
378 if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
379 error = -XFS_ERROR(EFAULT);
380 goto out;
381 }
382
383 error = -xfs_set_dmattrs(XFS_I(dentry->d_inode), fsd.fsd_dmevmask,
384 fsd.fsd_dmstate);
385
386 out:
387 dput(dentry);
388 return error;
389 }
390
391 STATIC int
392 xfs_attrlist_by_handle(
393 struct file *parfilp,
394 void __user *arg)
395 {
396 int error = -ENOMEM;
397 attrlist_cursor_kern_t *cursor;
398 xfs_fsop_attrlist_handlereq_t al_hreq;
399 struct dentry *dentry;
400 char *kbuf;
401
402 if (!capable(CAP_SYS_ADMIN))
403 return -XFS_ERROR(EPERM);
404 if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
405 return -XFS_ERROR(EFAULT);
406 if (al_hreq.buflen > XATTR_LIST_MAX)
407 return -XFS_ERROR(EINVAL);
408
409 /*
410 * Reject flags, only allow namespaces.
411 */
412 if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
413 return -XFS_ERROR(EINVAL);
414
415 dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
416 if (IS_ERR(dentry))
417 return PTR_ERR(dentry);
418
419 kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
420 if (!kbuf)
421 goto out_dput;
422
423 cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
424 error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
425 al_hreq.flags, cursor);
426 if (error)
427 goto out_kfree;
428
429 if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
430 error = -EFAULT;
431
432 out_kfree:
433 kfree(kbuf);
434 out_dput:
435 dput(dentry);
436 return error;
437 }
438
439 int
440 xfs_attrmulti_attr_get(
441 struct inode *inode,
442 unsigned char *name,
443 unsigned char __user *ubuf,
444 __uint32_t *len,
445 __uint32_t flags)
446 {
447 unsigned char *kbuf;
448 int error = EFAULT;
449
450 if (*len > XATTR_SIZE_MAX)
451 return EINVAL;
452 kbuf = kmalloc(*len, GFP_KERNEL);
453 if (!kbuf)
454 return ENOMEM;
455
456 error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags);
457 if (error)
458 goto out_kfree;
459
460 if (copy_to_user(ubuf, kbuf, *len))
461 error = EFAULT;
462
463 out_kfree:
464 kfree(kbuf);
465 return error;
466 }
467
468 int
469 xfs_attrmulti_attr_set(
470 struct inode *inode,
471 unsigned char *name,
472 const unsigned char __user *ubuf,
473 __uint32_t len,
474 __uint32_t flags)
475 {
476 unsigned char *kbuf;
477 int error = EFAULT;
478
479 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
480 return EPERM;
481 if (len > XATTR_SIZE_MAX)
482 return EINVAL;
483
484 kbuf = memdup_user(ubuf, len);
485 if (IS_ERR(kbuf))
486 return PTR_ERR(kbuf);
487
488 error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);
489
490 return error;
491 }
492
493 int
494 xfs_attrmulti_attr_remove(
495 struct inode *inode,
496 unsigned char *name,
497 __uint32_t flags)
498 {
499 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
500 return EPERM;
501 return xfs_attr_remove(XFS_I(inode), name, flags);
502 }
503
504 STATIC int
505 xfs_attrmulti_by_handle(
506 struct file *parfilp,
507 void __user *arg)
508 {
509 int error;
510 xfs_attr_multiop_t *ops;
511 xfs_fsop_attrmulti_handlereq_t am_hreq;
512 struct dentry *dentry;
513 unsigned int i, size;
514 unsigned char *attr_name;
515
516 if (!capable(CAP_SYS_ADMIN))
517 return -XFS_ERROR(EPERM);
518 if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
519 return -XFS_ERROR(EFAULT);
520
521 /* overflow check */
522 if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
523 return -E2BIG;
524
525 dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
526 if (IS_ERR(dentry))
527 return PTR_ERR(dentry);
528
529 error = E2BIG;
530 size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
531 if (!size || size > 16 * PAGE_SIZE)
532 goto out_dput;
533
534 ops = memdup_user(am_hreq.ops, size);
535 if (IS_ERR(ops)) {
536 error = PTR_ERR(ops);
537 goto out_dput;
538 }
539
540 attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
541 if (!attr_name)
542 goto out_kfree_ops;
543
544 error = 0;
545 for (i = 0; i < am_hreq.opcount; i++) {
546 ops[i].am_error = strncpy_from_user((char *)attr_name,
547 ops[i].am_attrname, MAXNAMELEN);
548 if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
549 error = -ERANGE;
550 if (ops[i].am_error < 0)
551 break;
552
553 switch (ops[i].am_opcode) {
554 case ATTR_OP_GET:
555 ops[i].am_error = xfs_attrmulti_attr_get(
556 dentry->d_inode, attr_name,
557 ops[i].am_attrvalue, &ops[i].am_length,
558 ops[i].am_flags);
559 break;
560 case ATTR_OP_SET:
561 ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
562 if (ops[i].am_error)
563 break;
564 ops[i].am_error = xfs_attrmulti_attr_set(
565 dentry->d_inode, attr_name,
566 ops[i].am_attrvalue, ops[i].am_length,
567 ops[i].am_flags);
568 mnt_drop_write(parfilp->f_path.mnt);
569 break;
570 case ATTR_OP_REMOVE:
571 ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
572 if (ops[i].am_error)
573 break;
574 ops[i].am_error = xfs_attrmulti_attr_remove(
575 dentry->d_inode, attr_name,
576 ops[i].am_flags);
577 mnt_drop_write(parfilp->f_path.mnt);
578 break;
579 default:
580 ops[i].am_error = EINVAL;
581 }
582 }
583
584 if (copy_to_user(am_hreq.ops, ops, size))
585 error = XFS_ERROR(EFAULT);
586
587 kfree(attr_name);
588 out_kfree_ops:
589 kfree(ops);
590 out_dput:
591 dput(dentry);
592 return -error;
593 }
594
595 int
596 xfs_ioc_space(
597 struct xfs_inode *ip,
598 struct inode *inode,
599 struct file *filp,
600 int ioflags,
601 unsigned int cmd,
602 xfs_flock64_t *bf)
603 {
604 int attr_flags = 0;
605 int error;
606
607 /*
608 * Only allow the sys admin to reserve space unless
609 * unwritten extents are enabled.
610 */
611 if (!xfs_sb_version_hasextflgbit(&ip->i_mount->m_sb) &&
612 !capable(CAP_SYS_ADMIN))
613 return -XFS_ERROR(EPERM);
614
615 if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
616 return -XFS_ERROR(EPERM);
617
618 if (!(filp->f_mode & FMODE_WRITE))
619 return -XFS_ERROR(EBADF);
620
621 if (!S_ISREG(inode->i_mode))
622 return -XFS_ERROR(EINVAL);
623
624 if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
625 attr_flags |= XFS_ATTR_NONBLOCK;
626 if (ioflags & IO_INVIS)
627 attr_flags |= XFS_ATTR_DMI;
628
629 error = xfs_change_file_space(ip, cmd, bf, filp->f_pos, attr_flags);
630 return -error;
631 }
632
633 STATIC int
634 xfs_ioc_bulkstat(
635 xfs_mount_t *mp,
636 unsigned int cmd,
637 void __user *arg)
638 {
639 xfs_fsop_bulkreq_t bulkreq;
640 int count; /* # of records returned */
641 xfs_ino_t inlast; /* last inode number */
642 int done;
643 int error;
644
645 /* done = 1 if there are more stats to get and if bulkstat */
646 /* should be called again (unused here, but used in dmapi) */
647
648 if (!capable(CAP_SYS_ADMIN))
649 return -EPERM;
650
651 if (XFS_FORCED_SHUTDOWN(mp))
652 return -XFS_ERROR(EIO);
653
654 if (copy_from_user(&bulkreq, arg, sizeof(xfs_fsop_bulkreq_t)))
655 return -XFS_ERROR(EFAULT);
656
657 if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
658 return -XFS_ERROR(EFAULT);
659
660 if ((count = bulkreq.icount) <= 0)
661 return -XFS_ERROR(EINVAL);
662
663 if (bulkreq.ubuffer == NULL)
664 return -XFS_ERROR(EINVAL);
665
666 if (cmd == XFS_IOC_FSINUMBERS)
667 error = xfs_inumbers(mp, &inlast, &count,
668 bulkreq.ubuffer, xfs_inumbers_fmt);
669 else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
670 error = xfs_bulkstat_single(mp, &inlast,
671 bulkreq.ubuffer, &done);
672 else /* XFS_IOC_FSBULKSTAT */
673 error = xfs_bulkstat(mp, &inlast, &count, xfs_bulkstat_one,
674 sizeof(xfs_bstat_t), bulkreq.ubuffer,
675 &done);
676
677 if (error)
678 return -error;
679
680 if (bulkreq.ocount != NULL) {
681 if (copy_to_user(bulkreq.lastip, &inlast,
682 sizeof(xfs_ino_t)))
683 return -XFS_ERROR(EFAULT);
684
685 if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
686 return -XFS_ERROR(EFAULT);
687 }
688
689 return 0;
690 }
691
692 STATIC int
693 xfs_ioc_fsgeometry_v1(
694 xfs_mount_t *mp,
695 void __user *arg)
696 {
697 xfs_fsop_geom_v1_t fsgeo;
698 int error;
699
700 error = xfs_fs_geometry(mp, (xfs_fsop_geom_t *)&fsgeo, 3);
701 if (error)
702 return -error;
703
704 if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
705 return -XFS_ERROR(EFAULT);
706 return 0;
707 }
708
709 STATIC int
710 xfs_ioc_fsgeometry(
711 xfs_mount_t *mp,
712 void __user *arg)
713 {
714 xfs_fsop_geom_t fsgeo;
715 int error;
716
717 error = xfs_fs_geometry(mp, &fsgeo, 4);
718 if (error)
719 return -error;
720
721 if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
722 return -XFS_ERROR(EFAULT);
723 return 0;
724 }
725
726 /*
727 * Linux extended inode flags interface.
728 */
729
730 STATIC unsigned int
731 xfs_merge_ioc_xflags(
732 unsigned int flags,
733 unsigned int start)
734 {
735 unsigned int xflags = start;
736
737 if (flags & FS_IMMUTABLE_FL)
738 xflags |= XFS_XFLAG_IMMUTABLE;
739 else
740 xflags &= ~XFS_XFLAG_IMMUTABLE;
741 if (flags & FS_APPEND_FL)
742 xflags |= XFS_XFLAG_APPEND;
743 else
744 xflags &= ~XFS_XFLAG_APPEND;
745 if (flags & FS_SYNC_FL)
746 xflags |= XFS_XFLAG_SYNC;
747 else
748 xflags &= ~XFS_XFLAG_SYNC;
749 if (flags & FS_NOATIME_FL)
750 xflags |= XFS_XFLAG_NOATIME;
751 else
752 xflags &= ~XFS_XFLAG_NOATIME;
753 if (flags & FS_NODUMP_FL)
754 xflags |= XFS_XFLAG_NODUMP;
755 else
756 xflags &= ~XFS_XFLAG_NODUMP;
757
758 return xflags;
759 }
760
761 STATIC unsigned int
762 xfs_di2lxflags(
763 __uint16_t di_flags)
764 {
765 unsigned int flags = 0;
766
767 if (di_flags & XFS_DIFLAG_IMMUTABLE)
768 flags |= FS_IMMUTABLE_FL;
769 if (di_flags & XFS_DIFLAG_APPEND)
770 flags |= FS_APPEND_FL;
771 if (di_flags & XFS_DIFLAG_SYNC)
772 flags |= FS_SYNC_FL;
773 if (di_flags & XFS_DIFLAG_NOATIME)
774 flags |= FS_NOATIME_FL;
775 if (di_flags & XFS_DIFLAG_NODUMP)
776 flags |= FS_NODUMP_FL;
777 return flags;
778 }
779
780 STATIC int
781 xfs_ioc_fsgetxattr(
782 xfs_inode_t *ip,
783 int attr,
784 void __user *arg)
785 {
786 struct fsxattr fa;
787
788 xfs_ilock(ip, XFS_ILOCK_SHARED);
789 fa.fsx_xflags = xfs_ip2xflags(ip);
790 fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
791 fa.fsx_projid = ip->i_d.di_projid;
792
793 if (attr) {
794 if (ip->i_afp) {
795 if (ip->i_afp->if_flags & XFS_IFEXTENTS)
796 fa.fsx_nextents = ip->i_afp->if_bytes /
797 sizeof(xfs_bmbt_rec_t);
798 else
799 fa.fsx_nextents = ip->i_d.di_anextents;
800 } else
801 fa.fsx_nextents = 0;
802 } else {
803 if (ip->i_df.if_flags & XFS_IFEXTENTS)
804 fa.fsx_nextents = ip->i_df.if_bytes /
805 sizeof(xfs_bmbt_rec_t);
806 else
807 fa.fsx_nextents = ip->i_d.di_nextents;
808 }
809 xfs_iunlock(ip, XFS_ILOCK_SHARED);
810
811 if (copy_to_user(arg, &fa, sizeof(fa)))
812 return -EFAULT;
813 return 0;
814 }
815
816 STATIC void
817 xfs_set_diflags(
818 struct xfs_inode *ip,
819 unsigned int xflags)
820 {
821 unsigned int di_flags;
822
823 /* can't set PREALLOC this way, just preserve it */
824 di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
825 if (xflags & XFS_XFLAG_IMMUTABLE)
826 di_flags |= XFS_DIFLAG_IMMUTABLE;
827 if (xflags & XFS_XFLAG_APPEND)
828 di_flags |= XFS_DIFLAG_APPEND;
829 if (xflags & XFS_XFLAG_SYNC)
830 di_flags |= XFS_DIFLAG_SYNC;
831 if (xflags & XFS_XFLAG_NOATIME)
832 di_flags |= XFS_DIFLAG_NOATIME;
833 if (xflags & XFS_XFLAG_NODUMP)
834 di_flags |= XFS_DIFLAG_NODUMP;
835 if (xflags & XFS_XFLAG_PROJINHERIT)
836 di_flags |= XFS_DIFLAG_PROJINHERIT;
837 if (xflags & XFS_XFLAG_NODEFRAG)
838 di_flags |= XFS_DIFLAG_NODEFRAG;
839 if (xflags & XFS_XFLAG_FILESTREAM)
840 di_flags |= XFS_DIFLAG_FILESTREAM;
841 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
842 if (xflags & XFS_XFLAG_RTINHERIT)
843 di_flags |= XFS_DIFLAG_RTINHERIT;
844 if (xflags & XFS_XFLAG_NOSYMLINKS)
845 di_flags |= XFS_DIFLAG_NOSYMLINKS;
846 if (xflags & XFS_XFLAG_EXTSZINHERIT)
847 di_flags |= XFS_DIFLAG_EXTSZINHERIT;
848 } else if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
849 if (xflags & XFS_XFLAG_REALTIME)
850 di_flags |= XFS_DIFLAG_REALTIME;
851 if (xflags & XFS_XFLAG_EXTSIZE)
852 di_flags |= XFS_DIFLAG_EXTSIZE;
853 }
854
855 ip->i_d.di_flags = di_flags;
856 }
857
858 STATIC void
859 xfs_diflags_to_linux(
860 struct xfs_inode *ip)
861 {
862 struct inode *inode = VFS_I(ip);
863 unsigned int xflags = xfs_ip2xflags(ip);
864
865 if (xflags & XFS_XFLAG_IMMUTABLE)
866 inode->i_flags |= S_IMMUTABLE;
867 else
868 inode->i_flags &= ~S_IMMUTABLE;
869 if (xflags & XFS_XFLAG_APPEND)
870 inode->i_flags |= S_APPEND;
871 else
872 inode->i_flags &= ~S_APPEND;
873 if (xflags & XFS_XFLAG_SYNC)
874 inode->i_flags |= S_SYNC;
875 else
876 inode->i_flags &= ~S_SYNC;
877 if (xflags & XFS_XFLAG_NOATIME)
878 inode->i_flags |= S_NOATIME;
879 else
880 inode->i_flags &= ~S_NOATIME;
881 }
882
883 #define FSX_PROJID 1
884 #define FSX_EXTSIZE 2
885 #define FSX_XFLAGS 4
886 #define FSX_NONBLOCK 8
887
888 STATIC int
889 xfs_ioctl_setattr(
890 xfs_inode_t *ip,
891 struct fsxattr *fa,
892 int mask)
893 {
894 struct xfs_mount *mp = ip->i_mount;
895 struct xfs_trans *tp;
896 unsigned int lock_flags = 0;
897 struct xfs_dquot *udqp = NULL;
898 struct xfs_dquot *gdqp = NULL;
899 struct xfs_dquot *olddquot = NULL;
900 int code;
901
902 xfs_itrace_entry(ip);
903
904 if (mp->m_flags & XFS_MOUNT_RDONLY)
905 return XFS_ERROR(EROFS);
906 if (XFS_FORCED_SHUTDOWN(mp))
907 return XFS_ERROR(EIO);
908
909 /*
910 * If disk quotas is on, we make sure that the dquots do exist on disk,
911 * before we start any other transactions. Trying to do this later
912 * is messy. We don't care to take a readlock to look at the ids
913 * in inode here, because we can't hold it across the trans_reserve.
914 * If the IDs do change before we take the ilock, we're covered
915 * because the i_*dquot fields will get updated anyway.
916 */
917 if (XFS_IS_QUOTA_ON(mp) && (mask & FSX_PROJID)) {
918 code = xfs_qm_vop_dqalloc(ip, ip->i_d.di_uid,
919 ip->i_d.di_gid, fa->fsx_projid,
920 XFS_QMOPT_PQUOTA, &udqp, &gdqp);
921 if (code)
922 return code;
923 }
924
925 /*
926 * For the other attributes, we acquire the inode lock and
927 * first do an error checking pass.
928 */
929 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
930 code = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
931 if (code)
932 goto error_return;
933
934 lock_flags = XFS_ILOCK_EXCL;
935 xfs_ilock(ip, lock_flags);
936
937 /*
938 * CAP_FOWNER overrides the following restrictions:
939 *
940 * The user ID of the calling process must be equal
941 * to the file owner ID, except in cases where the
942 * CAP_FSETID capability is applicable.
943 */
944 if (current_fsuid() != ip->i_d.di_uid && !capable(CAP_FOWNER)) {
945 code = XFS_ERROR(EPERM);
946 goto error_return;
947 }
948
949 /*
950 * Do a quota reservation only if projid is actually going to change.
951 */
952 if (mask & FSX_PROJID) {
953 if (XFS_IS_QUOTA_RUNNING(mp) &&
954 XFS_IS_PQUOTA_ON(mp) &&
955 ip->i_d.di_projid != fa->fsx_projid) {
956 ASSERT(tp);
957 code = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
958 capable(CAP_FOWNER) ?
959 XFS_QMOPT_FORCE_RES : 0);
960 if (code) /* out of quota */
961 goto error_return;
962 }
963 }
964
965 if (mask & FSX_EXTSIZE) {
966 /*
967 * Can't change extent size if any extents are allocated.
968 */
969 if (ip->i_d.di_nextents &&
970 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) !=
971 fa->fsx_extsize)) {
972 code = XFS_ERROR(EINVAL); /* EFBIG? */
973 goto error_return;
974 }
975
976 /*
977 * Extent size must be a multiple of the appropriate block
978 * size, if set at all.
979 */
980 if (fa->fsx_extsize != 0) {
981 xfs_extlen_t size;
982
983 if (XFS_IS_REALTIME_INODE(ip) ||
984 ((mask & FSX_XFLAGS) &&
985 (fa->fsx_xflags & XFS_XFLAG_REALTIME))) {
986 size = mp->m_sb.sb_rextsize <<
987 mp->m_sb.sb_blocklog;
988 } else {
989 size = mp->m_sb.sb_blocksize;
990 }
991
992 if (fa->fsx_extsize % size) {
993 code = XFS_ERROR(EINVAL);
994 goto error_return;
995 }
996 }
997 }
998
999
1000 if (mask & FSX_XFLAGS) {
1001 /*
1002 * Can't change realtime flag if any extents are allocated.
1003 */
1004 if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
1005 (XFS_IS_REALTIME_INODE(ip)) !=
1006 (fa->fsx_xflags & XFS_XFLAG_REALTIME)) {
1007 code = XFS_ERROR(EINVAL); /* EFBIG? */
1008 goto error_return;
1009 }
1010
1011 /*
1012 * If realtime flag is set then must have realtime data.
1013 */
1014 if ((fa->fsx_xflags & XFS_XFLAG_REALTIME)) {
1015 if ((mp->m_sb.sb_rblocks == 0) ||
1016 (mp->m_sb.sb_rextsize == 0) ||
1017 (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) {
1018 code = XFS_ERROR(EINVAL);
1019 goto error_return;
1020 }
1021 }
1022
1023 /*
1024 * Can't modify an immutable/append-only file unless
1025 * we have appropriate permission.
1026 */
1027 if ((ip->i_d.di_flags &
1028 (XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) ||
1029 (fa->fsx_xflags &
1030 (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) &&
1031 !capable(CAP_LINUX_IMMUTABLE)) {
1032 code = XFS_ERROR(EPERM);
1033 goto error_return;
1034 }
1035 }
1036
1037 xfs_trans_ijoin(tp, ip);
1038
1039 /*
1040 * Change file ownership. Must be the owner or privileged.
1041 */
1042 if (mask & FSX_PROJID) {
1043 /*
1044 * CAP_FSETID overrides the following restrictions:
1045 *
1046 * The set-user-ID and set-group-ID bits of a file will be
1047 * cleared upon successful return from chown()
1048 */
1049 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
1050 !capable(CAP_FSETID))
1051 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
1052
1053 /*
1054 * Change the ownerships and register quota modifications
1055 * in the transaction.
1056 */
1057 if (ip->i_d.di_projid != fa->fsx_projid) {
1058 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) {
1059 olddquot = xfs_qm_vop_chown(tp, ip,
1060 &ip->i_gdquot, gdqp);
1061 }
1062 ip->i_d.di_projid = fa->fsx_projid;
1063
1064 /*
1065 * We may have to rev the inode as well as
1066 * the superblock version number since projids didn't
1067 * exist before DINODE_VERSION_2 and SB_VERSION_NLINK.
1068 */
1069 if (ip->i_d.di_version == 1)
1070 xfs_bump_ino_vers2(tp, ip);
1071 }
1072
1073 }
1074
1075 if (mask & FSX_EXTSIZE)
1076 ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
1077 if (mask & FSX_XFLAGS) {
1078 xfs_set_diflags(ip, fa->fsx_xflags);
1079 xfs_diflags_to_linux(ip);
1080 }
1081
1082 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1083 xfs_ichgtime(ip, XFS_ICHGTIME_CHG);
1084
1085 XFS_STATS_INC(xs_ig_attrchg);
1086
1087 /*
1088 * If this is a synchronous mount, make sure that the
1089 * transaction goes to disk before returning to the user.
1090 * This is slightly sub-optimal in that truncates require
1091 * two sync transactions instead of one for wsync filesystems.
1092 * One for the truncate and one for the timestamps since we
1093 * don't want to change the timestamps unless we're sure the
1094 * truncate worked. Truncates are less than 1% of the laddis
1095 * mix so this probably isn't worth the trouble to optimize.
1096 */
1097 if (mp->m_flags & XFS_MOUNT_WSYNC)
1098 xfs_trans_set_sync(tp);
1099 code = xfs_trans_commit(tp, 0);
1100 xfs_iunlock(ip, lock_flags);
1101
1102 /*
1103 * Release any dquot(s) the inode had kept before chown.
1104 */
1105 xfs_qm_dqrele(olddquot);
1106 xfs_qm_dqrele(udqp);
1107 xfs_qm_dqrele(gdqp);
1108
1109 return code;
1110
1111 error_return:
1112 xfs_qm_dqrele(udqp);
1113 xfs_qm_dqrele(gdqp);
1114 xfs_trans_cancel(tp, 0);
1115 if (lock_flags)
1116 xfs_iunlock(ip, lock_flags);
1117 return code;
1118 }
1119
1120 STATIC int
1121 xfs_ioc_fssetxattr(
1122 xfs_inode_t *ip,
1123 struct file *filp,
1124 void __user *arg)
1125 {
1126 struct fsxattr fa;
1127 unsigned int mask;
1128
1129 if (copy_from_user(&fa, arg, sizeof(fa)))
1130 return -EFAULT;
1131
1132 mask = FSX_XFLAGS | FSX_EXTSIZE | FSX_PROJID;
1133 if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
1134 mask |= FSX_NONBLOCK;
1135
1136 return -xfs_ioctl_setattr(ip, &fa, mask);
1137 }
1138
1139 STATIC int
1140 xfs_ioc_getxflags(
1141 xfs_inode_t *ip,
1142 void __user *arg)
1143 {
1144 unsigned int flags;
1145
1146 flags = xfs_di2lxflags(ip->i_d.di_flags);
1147 if (copy_to_user(arg, &flags, sizeof(flags)))
1148 return -EFAULT;
1149 return 0;
1150 }
1151
1152 STATIC int
1153 xfs_ioc_setxflags(
1154 xfs_inode_t *ip,
1155 struct file *filp,
1156 void __user *arg)
1157 {
1158 struct fsxattr fa;
1159 unsigned int flags;
1160 unsigned int mask;
1161
1162 if (copy_from_user(&flags, arg, sizeof(flags)))
1163 return -EFAULT;
1164
1165 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
1166 FS_NOATIME_FL | FS_NODUMP_FL | \
1167 FS_SYNC_FL))
1168 return -EOPNOTSUPP;
1169
1170 mask = FSX_XFLAGS;
1171 if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
1172 mask |= FSX_NONBLOCK;
1173 fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
1174
1175 return -xfs_ioctl_setattr(ip, &fa, mask);
1176 }
1177
1178 STATIC int
1179 xfs_getbmap_format(void **ap, struct getbmapx *bmv, int *full)
1180 {
1181 struct getbmap __user *base = *ap;
1182
1183 /* copy only getbmap portion (not getbmapx) */
1184 if (copy_to_user(base, bmv, sizeof(struct getbmap)))
1185 return XFS_ERROR(EFAULT);
1186
1187 *ap += sizeof(struct getbmap);
1188 return 0;
1189 }
1190
1191 STATIC int
1192 xfs_ioc_getbmap(
1193 struct xfs_inode *ip,
1194 int ioflags,
1195 unsigned int cmd,
1196 void __user *arg)
1197 {
1198 struct getbmapx bmx;
1199 int error;
1200
1201 if (copy_from_user(&bmx, arg, sizeof(struct getbmapx)))
1202 return -XFS_ERROR(EFAULT);
1203
1204 if (bmx.bmv_count < 2)
1205 return -XFS_ERROR(EINVAL);
1206
1207 bmx.bmv_iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
1208 if (ioflags & IO_INVIS)
1209 bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
1210
1211 error = xfs_getbmap(ip, &bmx, xfs_getbmap_format,
1212 (struct getbmap *)arg+1);
1213 if (error)
1214 return -error;
1215
1216 /* copy back header - only size of getbmap */
1217 if (copy_to_user(arg, &bmx, sizeof(struct getbmap)))
1218 return -XFS_ERROR(EFAULT);
1219 return 0;
1220 }
1221
1222 STATIC int
1223 xfs_getbmapx_format(void **ap, struct getbmapx *bmv, int *full)
1224 {
1225 struct getbmapx __user *base = *ap;
1226
1227 if (copy_to_user(base, bmv, sizeof(struct getbmapx)))
1228 return XFS_ERROR(EFAULT);
1229
1230 *ap += sizeof(struct getbmapx);
1231 return 0;
1232 }
1233
1234 STATIC int
1235 xfs_ioc_getbmapx(
1236 struct xfs_inode *ip,
1237 void __user *arg)
1238 {
1239 struct getbmapx bmx;
1240 int error;
1241
1242 if (copy_from_user(&bmx, arg, sizeof(bmx)))
1243 return -XFS_ERROR(EFAULT);
1244
1245 if (bmx.bmv_count < 2)
1246 return -XFS_ERROR(EINVAL);
1247
1248 if (bmx.bmv_iflags & (~BMV_IF_VALID))
1249 return -XFS_ERROR(EINVAL);
1250
1251 error = xfs_getbmap(ip, &bmx, xfs_getbmapx_format,
1252 (struct getbmapx *)arg+1);
1253 if (error)
1254 return -error;
1255
1256 /* copy back header */
1257 if (copy_to_user(arg, &bmx, sizeof(struct getbmapx)))
1258 return -XFS_ERROR(EFAULT);
1259
1260 return 0;
1261 }
1262
1263 /*
1264 * Note: some of the ioctl's return positive numbers as a
1265 * byte count indicating success, such as readlink_by_handle.
1266 * So we don't "sign flip" like most other routines. This means
1267 * true errors need to be returned as a negative value.
1268 */
1269 long
1270 xfs_file_ioctl(
1271 struct file *filp,
1272 unsigned int cmd,
1273 unsigned long p)
1274 {
1275 struct inode *inode = filp->f_path.dentry->d_inode;
1276 struct xfs_inode *ip = XFS_I(inode);
1277 struct xfs_mount *mp = ip->i_mount;
1278 void __user *arg = (void __user *)p;
1279 int ioflags = 0;
1280 int error;
1281
1282 if (filp->f_mode & FMODE_NOCMTIME)
1283 ioflags |= IO_INVIS;
1284
1285 xfs_itrace_entry(ip);
1286
1287 switch (cmd) {
1288 case XFS_IOC_ALLOCSP:
1289 case XFS_IOC_FREESP:
1290 case XFS_IOC_RESVSP:
1291 case XFS_IOC_UNRESVSP:
1292 case XFS_IOC_ALLOCSP64:
1293 case XFS_IOC_FREESP64:
1294 case XFS_IOC_RESVSP64:
1295 case XFS_IOC_UNRESVSP64: {
1296 xfs_flock64_t bf;
1297
1298 if (copy_from_user(&bf, arg, sizeof(bf)))
1299 return -XFS_ERROR(EFAULT);
1300 return xfs_ioc_space(ip, inode, filp, ioflags, cmd, &bf);
1301 }
1302 case XFS_IOC_DIOINFO: {
1303 struct dioattr da;
1304 xfs_buftarg_t *target =
1305 XFS_IS_REALTIME_INODE(ip) ?
1306 mp->m_rtdev_targp : mp->m_ddev_targp;
1307
1308 da.d_mem = da.d_miniosz = 1 << target->bt_sshift;
1309 da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
1310
1311 if (copy_to_user(arg, &da, sizeof(da)))
1312 return -XFS_ERROR(EFAULT);
1313 return 0;
1314 }
1315
1316 case XFS_IOC_FSBULKSTAT_SINGLE:
1317 case XFS_IOC_FSBULKSTAT:
1318 case XFS_IOC_FSINUMBERS:
1319 return xfs_ioc_bulkstat(mp, cmd, arg);
1320
1321 case XFS_IOC_FSGEOMETRY_V1:
1322 return xfs_ioc_fsgeometry_v1(mp, arg);
1323
1324 case XFS_IOC_FSGEOMETRY:
1325 return xfs_ioc_fsgeometry(mp, arg);
1326
1327 case XFS_IOC_GETVERSION:
1328 return put_user(inode->i_generation, (int __user *)arg);
1329
1330 case XFS_IOC_FSGETXATTR:
1331 return xfs_ioc_fsgetxattr(ip, 0, arg);
1332 case XFS_IOC_FSGETXATTRA:
1333 return xfs_ioc_fsgetxattr(ip, 1, arg);
1334 case XFS_IOC_FSSETXATTR:
1335 return xfs_ioc_fssetxattr(ip, filp, arg);
1336 case XFS_IOC_GETXFLAGS:
1337 return xfs_ioc_getxflags(ip, arg);
1338 case XFS_IOC_SETXFLAGS:
1339 return xfs_ioc_setxflags(ip, filp, arg);
1340
1341 case XFS_IOC_FSSETDM: {
1342 struct fsdmidata dmi;
1343
1344 if (copy_from_user(&dmi, arg, sizeof(dmi)))
1345 return -XFS_ERROR(EFAULT);
1346
1347 error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
1348 dmi.fsd_dmstate);
1349 return -error;
1350 }
1351
1352 case XFS_IOC_GETBMAP:
1353 case XFS_IOC_GETBMAPA:
1354 return xfs_ioc_getbmap(ip, ioflags, cmd, arg);
1355
1356 case XFS_IOC_GETBMAPX:
1357 return xfs_ioc_getbmapx(ip, arg);
1358
1359 case XFS_IOC_FD_TO_HANDLE:
1360 case XFS_IOC_PATH_TO_HANDLE:
1361 case XFS_IOC_PATH_TO_FSHANDLE: {
1362 xfs_fsop_handlereq_t hreq;
1363
1364 if (copy_from_user(&hreq, arg, sizeof(hreq)))
1365 return -XFS_ERROR(EFAULT);
1366 return xfs_find_handle(cmd, &hreq);
1367 }
1368 case XFS_IOC_OPEN_BY_HANDLE: {
1369 xfs_fsop_handlereq_t hreq;
1370
1371 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1372 return -XFS_ERROR(EFAULT);
1373 return xfs_open_by_handle(filp, &hreq);
1374 }
1375 case XFS_IOC_FSSETDM_BY_HANDLE:
1376 return xfs_fssetdm_by_handle(filp, arg);
1377
1378 case XFS_IOC_READLINK_BY_HANDLE: {
1379 xfs_fsop_handlereq_t hreq;
1380
1381 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1382 return -XFS_ERROR(EFAULT);
1383 return xfs_readlink_by_handle(filp, &hreq);
1384 }
1385 case XFS_IOC_ATTRLIST_BY_HANDLE:
1386 return xfs_attrlist_by_handle(filp, arg);
1387
1388 case XFS_IOC_ATTRMULTI_BY_HANDLE:
1389 return xfs_attrmulti_by_handle(filp, arg);
1390
1391 case XFS_IOC_SWAPEXT: {
1392 struct xfs_swapext sxp;
1393
1394 if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
1395 return -XFS_ERROR(EFAULT);
1396 error = xfs_swapext(&sxp);
1397 return -error;
1398 }
1399
1400 case XFS_IOC_FSCOUNTS: {
1401 xfs_fsop_counts_t out;
1402
1403 error = xfs_fs_counts(mp, &out);
1404 if (error)
1405 return -error;
1406
1407 if (copy_to_user(arg, &out, sizeof(out)))
1408 return -XFS_ERROR(EFAULT);
1409 return 0;
1410 }
1411
1412 case XFS_IOC_SET_RESBLKS: {
1413 xfs_fsop_resblks_t inout;
1414 __uint64_t in;
1415
1416 if (!capable(CAP_SYS_ADMIN))
1417 return -EPERM;
1418
1419 if (mp->m_flags & XFS_MOUNT_RDONLY)
1420 return -XFS_ERROR(EROFS);
1421
1422 if (copy_from_user(&inout, arg, sizeof(inout)))
1423 return -XFS_ERROR(EFAULT);
1424
1425 /* input parameter is passed in resblks field of structure */
1426 in = inout.resblks;
1427 error = xfs_reserve_blocks(mp, &in, &inout);
1428 if (error)
1429 return -error;
1430
1431 if (copy_to_user(arg, &inout, sizeof(inout)))
1432 return -XFS_ERROR(EFAULT);
1433 return 0;
1434 }
1435
1436 case XFS_IOC_GET_RESBLKS: {
1437 xfs_fsop_resblks_t out;
1438
1439 if (!capable(CAP_SYS_ADMIN))
1440 return -EPERM;
1441
1442 error = xfs_reserve_blocks(mp, NULL, &out);
1443 if (error)
1444 return -error;
1445
1446 if (copy_to_user(arg, &out, sizeof(out)))
1447 return -XFS_ERROR(EFAULT);
1448
1449 return 0;
1450 }
1451
1452 case XFS_IOC_FSGROWFSDATA: {
1453 xfs_growfs_data_t in;
1454
1455 if (copy_from_user(&in, arg, sizeof(in)))
1456 return -XFS_ERROR(EFAULT);
1457
1458 error = xfs_growfs_data(mp, &in);
1459 return -error;
1460 }
1461
1462 case XFS_IOC_FSGROWFSLOG: {
1463 xfs_growfs_log_t in;
1464
1465 if (copy_from_user(&in, arg, sizeof(in)))
1466 return -XFS_ERROR(EFAULT);
1467
1468 error = xfs_growfs_log(mp, &in);
1469 return -error;
1470 }
1471
1472 case XFS_IOC_FSGROWFSRT: {
1473 xfs_growfs_rt_t in;
1474
1475 if (copy_from_user(&in, arg, sizeof(in)))
1476 return -XFS_ERROR(EFAULT);
1477
1478 error = xfs_growfs_rt(mp, &in);
1479 return -error;
1480 }
1481
1482 case XFS_IOC_GOINGDOWN: {
1483 __uint32_t in;
1484
1485 if (!capable(CAP_SYS_ADMIN))
1486 return -EPERM;
1487
1488 if (get_user(in, (__uint32_t __user *)arg))
1489 return -XFS_ERROR(EFAULT);
1490
1491 error = xfs_fs_goingdown(mp, in);
1492 return -error;
1493 }
1494
1495 case XFS_IOC_ERROR_INJECTION: {
1496 xfs_error_injection_t in;
1497
1498 if (!capable(CAP_SYS_ADMIN))
1499 return -EPERM;
1500
1501 if (copy_from_user(&in, arg, sizeof(in)))
1502 return -XFS_ERROR(EFAULT);
1503
1504 error = xfs_errortag_add(in.errtag, mp);
1505 return -error;
1506 }
1507
1508 case XFS_IOC_ERROR_CLEARALL:
1509 if (!capable(CAP_SYS_ADMIN))
1510 return -EPERM;
1511
1512 error = xfs_errortag_clearall(mp, 1);
1513 return -error;
1514
1515 default:
1516 return -ENOTTY;
1517 }
1518 }
Linux kernel - Deliverables
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