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_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_mount.h"
25 #include "xfs_inode.h"
26 #include "xfs_ioctl.h"
27 #include "xfs_alloc.h"
28 #include "xfs_rtalloc.h"
29 #include "xfs_itable.h"
30 #include "xfs_error.h"
31 #include "xfs_attr.h"
32 #include "xfs_bmap.h"
33 #include "xfs_bmap_util.h"
34 #include "xfs_fsops.h"
35 #include "xfs_discard.h"
36 #include "xfs_quota.h"
37 #include "xfs_export.h"
38 #include "xfs_trace.h"
39 #include "xfs_icache.h"
40 #include "xfs_symlink.h"
41 #include "xfs_trans.h"
42 #include "xfs_pnfs.h"
43 #include "xfs_acl.h"
44 #include "xfs_btree.h"
45 #include <linux/fsmap.h>
46 #include "xfs_fsmap.h"
47
48 #include <linux/capability.h>
49 #include <linux/cred.h>
50 #include <linux/dcache.h>
51 #include <linux/mount.h>
52 #include <linux/namei.h>
53 #include <linux/pagemap.h>
54 #include <linux/slab.h>
55 #include <linux/exportfs.h>
56
57 /*
58 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
59 * a file or fs handle.
60 *
61 * XFS_IOC_PATH_TO_FSHANDLE
62 * returns fs handle for a mount point or path within that mount point
63 * XFS_IOC_FD_TO_HANDLE
64 * returns full handle for a FD opened in user space
65 * XFS_IOC_PATH_TO_HANDLE
66 * returns full handle for a path
67 */
68 int
xfs_find_handle(unsigned int cmd,xfs_fsop_handlereq_t * hreq)69 xfs_find_handle(
70 unsigned int cmd,
71 xfs_fsop_handlereq_t *hreq)
72 {
73 int hsize;
74 xfs_handle_t handle;
75 struct inode *inode;
76 struct fd f = {NULL};
77 struct path path;
78 int error;
79 struct xfs_inode *ip;
80
81 if (cmd == XFS_IOC_FD_TO_HANDLE) {
82 f = fdget(hreq->fd);
83 if (!f.file)
84 return -EBADF;
85 inode = file_inode(f.file);
86 } else {
87 error = user_lpath((const char __user *)hreq->path, &path);
88 if (error)
89 return error;
90 inode = d_inode(path.dentry);
91 }
92 ip = XFS_I(inode);
93
94 /*
95 * We can only generate handles for inodes residing on a XFS filesystem,
96 * and only for regular files, directories or symbolic links.
97 */
98 error = -EINVAL;
99 if (inode->i_sb->s_magic != XFS_SB_MAGIC)
100 goto out_put;
101
102 error = -EBADF;
103 if (!S_ISREG(inode->i_mode) &&
104 !S_ISDIR(inode->i_mode) &&
105 !S_ISLNK(inode->i_mode))
106 goto out_put;
107
108
109 memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));
110
111 if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
112 /*
113 * This handle only contains an fsid, zero the rest.
114 */
115 memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
116 hsize = sizeof(xfs_fsid_t);
117 } else {
118 handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
119 sizeof(handle.ha_fid.fid_len);
120 handle.ha_fid.fid_pad = 0;
121 handle.ha_fid.fid_gen = inode->i_generation;
122 handle.ha_fid.fid_ino = ip->i_ino;
123 hsize = sizeof(xfs_handle_t);
124 }
125
126 error = -EFAULT;
127 if (copy_to_user(hreq->ohandle, &handle, hsize) ||
128 copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
129 goto out_put;
130
131 error = 0;
132
133 out_put:
134 if (cmd == XFS_IOC_FD_TO_HANDLE)
135 fdput(f);
136 else
137 path_put(&path);
138 return error;
139 }
140
141 /*
142 * No need to do permission checks on the various pathname components
143 * as the handle operations are privileged.
144 */
145 STATIC int
xfs_handle_acceptable(void * context,struct dentry * dentry)146 xfs_handle_acceptable(
147 void *context,
148 struct dentry *dentry)
149 {
150 return 1;
151 }
152
153 /*
154 * Convert userspace handle data into a dentry.
155 */
156 struct dentry *
xfs_handle_to_dentry(struct file * parfilp,void __user * uhandle,u32 hlen)157 xfs_handle_to_dentry(
158 struct file *parfilp,
159 void __user *uhandle,
160 u32 hlen)
161 {
162 xfs_handle_t handle;
163 struct xfs_fid64 fid;
164
165 /*
166 * Only allow handle opens under a directory.
167 */
168 if (!S_ISDIR(file_inode(parfilp)->i_mode))
169 return ERR_PTR(-ENOTDIR);
170
171 if (hlen != sizeof(xfs_handle_t))
172 return ERR_PTR(-EINVAL);
173 if (copy_from_user(&handle, uhandle, hlen))
174 return ERR_PTR(-EFAULT);
175 if (handle.ha_fid.fid_len !=
176 sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
177 return ERR_PTR(-EINVAL);
178
179 memset(&fid, 0, sizeof(struct fid));
180 fid.ino = handle.ha_fid.fid_ino;
181 fid.gen = handle.ha_fid.fid_gen;
182
183 return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
184 FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
185 xfs_handle_acceptable, NULL);
186 }
187
188 STATIC struct dentry *
xfs_handlereq_to_dentry(struct file * parfilp,xfs_fsop_handlereq_t * hreq)189 xfs_handlereq_to_dentry(
190 struct file *parfilp,
191 xfs_fsop_handlereq_t *hreq)
192 {
193 return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
194 }
195
196 int
xfs_open_by_handle(struct file * parfilp,xfs_fsop_handlereq_t * hreq)197 xfs_open_by_handle(
198 struct file *parfilp,
199 xfs_fsop_handlereq_t *hreq)
200 {
201 const struct cred *cred = current_cred();
202 int error;
203 int fd;
204 int permflag;
205 struct file *filp;
206 struct inode *inode;
207 struct dentry *dentry;
208 fmode_t fmode;
209 struct path path;
210
211 if (!capable(CAP_SYS_ADMIN))
212 return -EPERM;
213
214 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
215 if (IS_ERR(dentry))
216 return PTR_ERR(dentry);
217 inode = d_inode(dentry);
218
219 /* Restrict xfs_open_by_handle to directories & regular files. */
220 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
221 error = -EPERM;
222 goto out_dput;
223 }
224
225 #if BITS_PER_LONG != 32
226 hreq->oflags |= O_LARGEFILE;
227 #endif
228
229 permflag = hreq->oflags;
230 fmode = OPEN_FMODE(permflag);
231 if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
232 (fmode & FMODE_WRITE) && IS_APPEND(inode)) {
233 error = -EPERM;
234 goto out_dput;
235 }
236
237 if ((fmode & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
238 error = -EPERM;
239 goto out_dput;
240 }
241
242 /* Can't write directories. */
243 if (S_ISDIR(inode->i_mode) && (fmode & FMODE_WRITE)) {
244 error = -EISDIR;
245 goto out_dput;
246 }
247
248 fd = get_unused_fd_flags(0);
249 if (fd < 0) {
250 error = fd;
251 goto out_dput;
252 }
253
254 path.mnt = parfilp->f_path.mnt;
255 path.dentry = dentry;
256 filp = dentry_open(&path, hreq->oflags, cred);
257 dput(dentry);
258 if (IS_ERR(filp)) {
259 put_unused_fd(fd);
260 return PTR_ERR(filp);
261 }
262
263 if (S_ISREG(inode->i_mode)) {
264 filp->f_flags |= O_NOATIME;
265 filp->f_mode |= FMODE_NOCMTIME;
266 }
267
268 fd_install(fd, filp);
269 return fd;
270
271 out_dput:
272 dput(dentry);
273 return error;
274 }
275
276 int
xfs_readlink_by_handle(struct file * parfilp,xfs_fsop_handlereq_t * hreq)277 xfs_readlink_by_handle(
278 struct file *parfilp,
279 xfs_fsop_handlereq_t *hreq)
280 {
281 struct dentry *dentry;
282 __u32 olen;
283 int error;
284
285 if (!capable(CAP_SYS_ADMIN))
286 return -EPERM;
287
288 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
289 if (IS_ERR(dentry))
290 return PTR_ERR(dentry);
291
292 /* Restrict this handle operation to symlinks only. */
293 if (!d_is_symlink(dentry)) {
294 error = -EINVAL;
295 goto out_dput;
296 }
297
298 if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
299 error = -EFAULT;
300 goto out_dput;
301 }
302
303 error = vfs_readlink(dentry, hreq->ohandle, olen);
304
305 out_dput:
306 dput(dentry);
307 return error;
308 }
309
310 int
xfs_set_dmattrs(xfs_inode_t * ip,u_int evmask,u_int16_t state)311 xfs_set_dmattrs(
312 xfs_inode_t *ip,
313 u_int evmask,
314 u_int16_t state)
315 {
316 xfs_mount_t *mp = ip->i_mount;
317 xfs_trans_t *tp;
318 int error;
319
320 if (!capable(CAP_SYS_ADMIN))
321 return -EPERM;
322
323 if (XFS_FORCED_SHUTDOWN(mp))
324 return -EIO;
325
326 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
327 if (error)
328 return error;
329
330 xfs_ilock(ip, XFS_ILOCK_EXCL);
331 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
332
333 ip->i_d.di_dmevmask = evmask;
334 ip->i_d.di_dmstate = state;
335
336 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
337 error = xfs_trans_commit(tp);
338
339 return error;
340 }
341
342 STATIC int
xfs_fssetdm_by_handle(struct file * parfilp,void __user * arg)343 xfs_fssetdm_by_handle(
344 struct file *parfilp,
345 void __user *arg)
346 {
347 int error;
348 struct fsdmidata fsd;
349 xfs_fsop_setdm_handlereq_t dmhreq;
350 struct dentry *dentry;
351
352 if (!capable(CAP_MKNOD))
353 return -EPERM;
354 if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
355 return -EFAULT;
356
357 error = mnt_want_write_file(parfilp);
358 if (error)
359 return error;
360
361 dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
362 if (IS_ERR(dentry)) {
363 mnt_drop_write_file(parfilp);
364 return PTR_ERR(dentry);
365 }
366
367 if (IS_IMMUTABLE(d_inode(dentry)) || IS_APPEND(d_inode(dentry))) {
368 error = -EPERM;
369 goto out;
370 }
371
372 if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
373 error = -EFAULT;
374 goto out;
375 }
376
377 error = xfs_set_dmattrs(XFS_I(d_inode(dentry)), fsd.fsd_dmevmask,
378 fsd.fsd_dmstate);
379
380 out:
381 mnt_drop_write_file(parfilp);
382 dput(dentry);
383 return error;
384 }
385
386 STATIC int
xfs_attrlist_by_handle(struct file * parfilp,void __user * arg)387 xfs_attrlist_by_handle(
388 struct file *parfilp,
389 void __user *arg)
390 {
391 int error = -ENOMEM;
392 attrlist_cursor_kern_t *cursor;
393 struct xfs_fsop_attrlist_handlereq __user *p = arg;
394 xfs_fsop_attrlist_handlereq_t al_hreq;
395 struct dentry *dentry;
396 char *kbuf;
397
398 if (!capable(CAP_SYS_ADMIN))
399 return -EPERM;
400 if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
401 return -EFAULT;
402 if (al_hreq.buflen < sizeof(struct attrlist) ||
403 al_hreq.buflen > XFS_XATTR_LIST_MAX)
404 return -EINVAL;
405
406 /*
407 * Reject flags, only allow namespaces.
408 */
409 if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
410 return -EINVAL;
411
412 dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
413 if (IS_ERR(dentry))
414 return PTR_ERR(dentry);
415
416 kbuf = kmem_zalloc_large(al_hreq.buflen, KM_SLEEP);
417 if (!kbuf)
418 goto out_dput;
419
420 cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
421 error = xfs_attr_list(XFS_I(d_inode(dentry)), kbuf, al_hreq.buflen,
422 al_hreq.flags, cursor);
423 if (error)
424 goto out_kfree;
425
426 if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t))) {
427 error = -EFAULT;
428 goto out_kfree;
429 }
430
431 if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
432 error = -EFAULT;
433
434 out_kfree:
435 kmem_free(kbuf);
436 out_dput:
437 dput(dentry);
438 return error;
439 }
440
441 int
xfs_attrmulti_attr_get(struct inode * inode,unsigned char * name,unsigned char __user * ubuf,uint32_t * len,uint32_t flags)442 xfs_attrmulti_attr_get(
443 struct inode *inode,
444 unsigned char *name,
445 unsigned char __user *ubuf,
446 uint32_t *len,
447 uint32_t flags)
448 {
449 unsigned char *kbuf;
450 int error = -EFAULT;
451
452 if (*len > XFS_XATTR_SIZE_MAX)
453 return -EINVAL;
454 kbuf = kmem_zalloc_large(*len, KM_SLEEP);
455 if (!kbuf)
456 return -ENOMEM;
457
458 error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags);
459 if (error)
460 goto out_kfree;
461
462 if (copy_to_user(ubuf, kbuf, *len))
463 error = -EFAULT;
464
465 out_kfree:
466 kmem_free(kbuf);
467 return error;
468 }
469
470 int
xfs_attrmulti_attr_set(struct inode * inode,unsigned char * name,const unsigned char __user * ubuf,uint32_t len,uint32_t flags)471 xfs_attrmulti_attr_set(
472 struct inode *inode,
473 unsigned char *name,
474 const unsigned char __user *ubuf,
475 uint32_t len,
476 uint32_t flags)
477 {
478 unsigned char *kbuf;
479 int error;
480
481 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
482 return -EPERM;
483 if (len > XFS_XATTR_SIZE_MAX)
484 return -EINVAL;
485
486 kbuf = memdup_user(ubuf, len);
487 if (IS_ERR(kbuf))
488 return PTR_ERR(kbuf);
489
490 error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);
491 if (!error)
492 xfs_forget_acl(inode, name, flags);
493 kfree(kbuf);
494 return error;
495 }
496
497 int
xfs_attrmulti_attr_remove(struct inode * inode,unsigned char * name,uint32_t flags)498 xfs_attrmulti_attr_remove(
499 struct inode *inode,
500 unsigned char *name,
501 uint32_t flags)
502 {
503 int error;
504
505 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
506 return -EPERM;
507 error = xfs_attr_remove(XFS_I(inode), name, flags);
508 if (!error)
509 xfs_forget_acl(inode, name, flags);
510 return error;
511 }
512
513 STATIC int
xfs_attrmulti_by_handle(struct file * parfilp,void __user * arg)514 xfs_attrmulti_by_handle(
515 struct file *parfilp,
516 void __user *arg)
517 {
518 int error;
519 xfs_attr_multiop_t *ops;
520 xfs_fsop_attrmulti_handlereq_t am_hreq;
521 struct dentry *dentry;
522 unsigned int i, size;
523 unsigned char *attr_name;
524
525 if (!capable(CAP_SYS_ADMIN))
526 return -EPERM;
527 if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
528 return -EFAULT;
529
530 /* overflow check */
531 if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
532 return -E2BIG;
533
534 dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
535 if (IS_ERR(dentry))
536 return PTR_ERR(dentry);
537
538 error = -E2BIG;
539 size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
540 if (!size || size > 16 * PAGE_SIZE)
541 goto out_dput;
542
543 ops = memdup_user(am_hreq.ops, size);
544 if (IS_ERR(ops)) {
545 error = PTR_ERR(ops);
546 goto out_dput;
547 }
548
549 error = -ENOMEM;
550 attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
551 if (!attr_name)
552 goto out_kfree_ops;
553
554 error = 0;
555 for (i = 0; i < am_hreq.opcount; i++) {
556 ops[i].am_error = strncpy_from_user((char *)attr_name,
557 ops[i].am_attrname, MAXNAMELEN);
558 if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
559 error = -ERANGE;
560 if (ops[i].am_error < 0)
561 break;
562
563 switch (ops[i].am_opcode) {
564 case ATTR_OP_GET:
565 ops[i].am_error = xfs_attrmulti_attr_get(
566 d_inode(dentry), attr_name,
567 ops[i].am_attrvalue, &ops[i].am_length,
568 ops[i].am_flags);
569 break;
570 case ATTR_OP_SET:
571 ops[i].am_error = mnt_want_write_file(parfilp);
572 if (ops[i].am_error)
573 break;
574 ops[i].am_error = xfs_attrmulti_attr_set(
575 d_inode(dentry), attr_name,
576 ops[i].am_attrvalue, ops[i].am_length,
577 ops[i].am_flags);
578 mnt_drop_write_file(parfilp);
579 break;
580 case ATTR_OP_REMOVE:
581 ops[i].am_error = mnt_want_write_file(parfilp);
582 if (ops[i].am_error)
583 break;
584 ops[i].am_error = xfs_attrmulti_attr_remove(
585 d_inode(dentry), attr_name,
586 ops[i].am_flags);
587 mnt_drop_write_file(parfilp);
588 break;
589 default:
590 ops[i].am_error = -EINVAL;
591 }
592 }
593
594 if (copy_to_user(am_hreq.ops, ops, size))
595 error = -EFAULT;
596
597 kfree(attr_name);
598 out_kfree_ops:
599 kfree(ops);
600 out_dput:
601 dput(dentry);
602 return error;
603 }
604
605 int
xfs_ioc_space(struct file * filp,unsigned int cmd,xfs_flock64_t * bf)606 xfs_ioc_space(
607 struct file *filp,
608 unsigned int cmd,
609 xfs_flock64_t *bf)
610 {
611 struct inode *inode = file_inode(filp);
612 struct xfs_inode *ip = XFS_I(inode);
613 struct iattr iattr;
614 enum xfs_prealloc_flags flags = 0;
615 uint iolock = XFS_IOLOCK_EXCL;
616 int error;
617
618 /*
619 * Only allow the sys admin to reserve space unless
620 * unwritten extents are enabled.
621 */
622 if (!xfs_sb_version_hasextflgbit(&ip->i_mount->m_sb) &&
623 !capable(CAP_SYS_ADMIN))
624 return -EPERM;
625
626 if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
627 return -EPERM;
628
629 if (!(filp->f_mode & FMODE_WRITE))
630 return -EBADF;
631
632 if (!S_ISREG(inode->i_mode))
633 return -EINVAL;
634
635 if (filp->f_flags & O_DSYNC)
636 flags |= XFS_PREALLOC_SYNC;
637 if (filp->f_mode & FMODE_NOCMTIME)
638 flags |= XFS_PREALLOC_INVISIBLE;
639
640 error = mnt_want_write_file(filp);
641 if (error)
642 return error;
643
644 xfs_ilock(ip, iolock);
645 error = xfs_break_layouts(inode, &iolock);
646 if (error)
647 goto out_unlock;
648
649 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
650 iolock |= XFS_MMAPLOCK_EXCL;
651
652 switch (bf->l_whence) {
653 case 0: /*SEEK_SET*/
654 break;
655 case 1: /*SEEK_CUR*/
656 bf->l_start += filp->f_pos;
657 break;
658 case 2: /*SEEK_END*/
659 bf->l_start += XFS_ISIZE(ip);
660 break;
661 default:
662 error = -EINVAL;
663 goto out_unlock;
664 }
665
666 /*
667 * length of <= 0 for resv/unresv/zero is invalid. length for
668 * alloc/free is ignored completely and we have no idea what userspace
669 * might have set it to, so set it to zero to allow range
670 * checks to pass.
671 */
672 switch (cmd) {
673 case XFS_IOC_ZERO_RANGE:
674 case XFS_IOC_RESVSP:
675 case XFS_IOC_RESVSP64:
676 case XFS_IOC_UNRESVSP:
677 case XFS_IOC_UNRESVSP64:
678 if (bf->l_len <= 0) {
679 error = -EINVAL;
680 goto out_unlock;
681 }
682 break;
683 default:
684 bf->l_len = 0;
685 break;
686 }
687
688 if (bf->l_start < 0 ||
689 bf->l_start > inode->i_sb->s_maxbytes ||
690 bf->l_start + bf->l_len < 0 ||
691 bf->l_start + bf->l_len >= inode->i_sb->s_maxbytes) {
692 error = -EINVAL;
693 goto out_unlock;
694 }
695
696 switch (cmd) {
697 case XFS_IOC_ZERO_RANGE:
698 flags |= XFS_PREALLOC_SET;
699 error = xfs_zero_file_space(ip, bf->l_start, bf->l_len);
700 break;
701 case XFS_IOC_RESVSP:
702 case XFS_IOC_RESVSP64:
703 flags |= XFS_PREALLOC_SET;
704 error = xfs_alloc_file_space(ip, bf->l_start, bf->l_len,
705 XFS_BMAPI_PREALLOC);
706 break;
707 case XFS_IOC_UNRESVSP:
708 case XFS_IOC_UNRESVSP64:
709 error = xfs_free_file_space(ip, bf->l_start, bf->l_len);
710 break;
711 case XFS_IOC_ALLOCSP:
712 case XFS_IOC_ALLOCSP64:
713 case XFS_IOC_FREESP:
714 case XFS_IOC_FREESP64:
715 flags |= XFS_PREALLOC_CLEAR;
716 if (bf->l_start > XFS_ISIZE(ip)) {
717 error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
718 bf->l_start - XFS_ISIZE(ip), 0);
719 if (error)
720 goto out_unlock;
721 }
722
723 iattr.ia_valid = ATTR_SIZE;
724 iattr.ia_size = bf->l_start;
725
726 error = xfs_vn_setattr_size(file_dentry(filp), &iattr);
727 break;
728 default:
729 ASSERT(0);
730 error = -EINVAL;
731 }
732
733 if (error)
734 goto out_unlock;
735
736 error = xfs_update_prealloc_flags(ip, flags);
737
738 out_unlock:
739 xfs_iunlock(ip, iolock);
740 mnt_drop_write_file(filp);
741 return error;
742 }
743
744 STATIC int
xfs_ioc_bulkstat(xfs_mount_t * mp,unsigned int cmd,void __user * arg)745 xfs_ioc_bulkstat(
746 xfs_mount_t *mp,
747 unsigned int cmd,
748 void __user *arg)
749 {
750 xfs_fsop_bulkreq_t bulkreq;
751 int count; /* # of records returned */
752 xfs_ino_t inlast; /* last inode number */
753 int done;
754 int error;
755
756 /* done = 1 if there are more stats to get and if bulkstat */
757 /* should be called again (unused here, but used in dmapi) */
758
759 if (!capable(CAP_SYS_ADMIN))
760 return -EPERM;
761
762 if (XFS_FORCED_SHUTDOWN(mp))
763 return -EIO;
764
765 if (copy_from_user(&bulkreq, arg, sizeof(xfs_fsop_bulkreq_t)))
766 return -EFAULT;
767
768 if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
769 return -EFAULT;
770
771 if ((count = bulkreq.icount) <= 0)
772 return -EINVAL;
773
774 if (bulkreq.ubuffer == NULL)
775 return -EINVAL;
776
777 if (cmd == XFS_IOC_FSINUMBERS)
778 error = xfs_inumbers(mp, &inlast, &count,
779 bulkreq.ubuffer, xfs_inumbers_fmt);
780 else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
781 error = xfs_bulkstat_one(mp, inlast, bulkreq.ubuffer,
782 sizeof(xfs_bstat_t), NULL, &done);
783 else /* XFS_IOC_FSBULKSTAT */
784 error = xfs_bulkstat(mp, &inlast, &count, xfs_bulkstat_one,
785 sizeof(xfs_bstat_t), bulkreq.ubuffer,
786 &done);
787
788 if (error)
789 return error;
790
791 if (bulkreq.ocount != NULL) {
792 if (copy_to_user(bulkreq.lastip, &inlast,
793 sizeof(xfs_ino_t)))
794 return -EFAULT;
795
796 if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
797 return -EFAULT;
798 }
799
800 return 0;
801 }
802
803 STATIC int
xfs_ioc_fsgeometry_v1(xfs_mount_t * mp,void __user * arg)804 xfs_ioc_fsgeometry_v1(
805 xfs_mount_t *mp,
806 void __user *arg)
807 {
808 xfs_fsop_geom_t fsgeo;
809 int error;
810
811 error = xfs_fs_geometry(mp, &fsgeo, 3);
812 if (error)
813 return error;
814
815 /*
816 * Caller should have passed an argument of type
817 * xfs_fsop_geom_v1_t. This is a proper subset of the
818 * xfs_fsop_geom_t that xfs_fs_geometry() fills in.
819 */
820 if (copy_to_user(arg, &fsgeo, sizeof(xfs_fsop_geom_v1_t)))
821 return -EFAULT;
822 return 0;
823 }
824
825 STATIC int
xfs_ioc_fsgeometry(xfs_mount_t * mp,void __user * arg)826 xfs_ioc_fsgeometry(
827 xfs_mount_t *mp,
828 void __user *arg)
829 {
830 xfs_fsop_geom_t fsgeo;
831 int error;
832
833 error = xfs_fs_geometry(mp, &fsgeo, 4);
834 if (error)
835 return error;
836
837 if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
838 return -EFAULT;
839 return 0;
840 }
841
842 /*
843 * Linux extended inode flags interface.
844 */
845
846 STATIC unsigned int
xfs_merge_ioc_xflags(unsigned int flags,unsigned int start)847 xfs_merge_ioc_xflags(
848 unsigned int flags,
849 unsigned int start)
850 {
851 unsigned int xflags = start;
852
853 if (flags & FS_IMMUTABLE_FL)
854 xflags |= FS_XFLAG_IMMUTABLE;
855 else
856 xflags &= ~FS_XFLAG_IMMUTABLE;
857 if (flags & FS_APPEND_FL)
858 xflags |= FS_XFLAG_APPEND;
859 else
860 xflags &= ~FS_XFLAG_APPEND;
861 if (flags & FS_SYNC_FL)
862 xflags |= FS_XFLAG_SYNC;
863 else
864 xflags &= ~FS_XFLAG_SYNC;
865 if (flags & FS_NOATIME_FL)
866 xflags |= FS_XFLAG_NOATIME;
867 else
868 xflags &= ~FS_XFLAG_NOATIME;
869 if (flags & FS_NODUMP_FL)
870 xflags |= FS_XFLAG_NODUMP;
871 else
872 xflags &= ~FS_XFLAG_NODUMP;
873
874 return xflags;
875 }
876
877 STATIC unsigned int
xfs_di2lxflags(uint16_t di_flags)878 xfs_di2lxflags(
879 uint16_t di_flags)
880 {
881 unsigned int flags = 0;
882
883 if (di_flags & XFS_DIFLAG_IMMUTABLE)
884 flags |= FS_IMMUTABLE_FL;
885 if (di_flags & XFS_DIFLAG_APPEND)
886 flags |= FS_APPEND_FL;
887 if (di_flags & XFS_DIFLAG_SYNC)
888 flags |= FS_SYNC_FL;
889 if (di_flags & XFS_DIFLAG_NOATIME)
890 flags |= FS_NOATIME_FL;
891 if (di_flags & XFS_DIFLAG_NODUMP)
892 flags |= FS_NODUMP_FL;
893 return flags;
894 }
895
896 STATIC int
xfs_ioc_fsgetxattr(xfs_inode_t * ip,int attr,void __user * arg)897 xfs_ioc_fsgetxattr(
898 xfs_inode_t *ip,
899 int attr,
900 void __user *arg)
901 {
902 struct fsxattr fa;
903
904 memset(&fa, 0, sizeof(struct fsxattr));
905
906 xfs_ilock(ip, XFS_ILOCK_SHARED);
907 fa.fsx_xflags = xfs_ip2xflags(ip);
908 fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
909 fa.fsx_cowextsize = ip->i_d.di_cowextsize <<
910 ip->i_mount->m_sb.sb_blocklog;
911 fa.fsx_projid = xfs_get_projid(ip);
912
913 if (attr) {
914 if (ip->i_afp) {
915 if (ip->i_afp->if_flags & XFS_IFEXTENTS)
916 fa.fsx_nextents = xfs_iext_count(ip->i_afp);
917 else
918 fa.fsx_nextents = ip->i_d.di_anextents;
919 } else
920 fa.fsx_nextents = 0;
921 } else {
922 if (ip->i_df.if_flags & XFS_IFEXTENTS)
923 fa.fsx_nextents = xfs_iext_count(&ip->i_df);
924 else
925 fa.fsx_nextents = ip->i_d.di_nextents;
926 }
927 xfs_iunlock(ip, XFS_ILOCK_SHARED);
928
929 if (copy_to_user(arg, &fa, sizeof(fa)))
930 return -EFAULT;
931 return 0;
932 }
933
934 STATIC uint16_t
xfs_flags2diflags(struct xfs_inode * ip,unsigned int xflags)935 xfs_flags2diflags(
936 struct xfs_inode *ip,
937 unsigned int xflags)
938 {
939 /* can't set PREALLOC this way, just preserve it */
940 uint16_t di_flags =
941 (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
942
943 if (xflags & FS_XFLAG_IMMUTABLE)
944 di_flags |= XFS_DIFLAG_IMMUTABLE;
945 if (xflags & FS_XFLAG_APPEND)
946 di_flags |= XFS_DIFLAG_APPEND;
947 if (xflags & FS_XFLAG_SYNC)
948 di_flags |= XFS_DIFLAG_SYNC;
949 if (xflags & FS_XFLAG_NOATIME)
950 di_flags |= XFS_DIFLAG_NOATIME;
951 if (xflags & FS_XFLAG_NODUMP)
952 di_flags |= XFS_DIFLAG_NODUMP;
953 if (xflags & FS_XFLAG_NODEFRAG)
954 di_flags |= XFS_DIFLAG_NODEFRAG;
955 if (xflags & FS_XFLAG_FILESTREAM)
956 di_flags |= XFS_DIFLAG_FILESTREAM;
957 if (S_ISDIR(VFS_I(ip)->i_mode)) {
958 if (xflags & FS_XFLAG_RTINHERIT)
959 di_flags |= XFS_DIFLAG_RTINHERIT;
960 if (xflags & FS_XFLAG_NOSYMLINKS)
961 di_flags |= XFS_DIFLAG_NOSYMLINKS;
962 if (xflags & FS_XFLAG_EXTSZINHERIT)
963 di_flags |= XFS_DIFLAG_EXTSZINHERIT;
964 if (xflags & FS_XFLAG_PROJINHERIT)
965 di_flags |= XFS_DIFLAG_PROJINHERIT;
966 } else if (S_ISREG(VFS_I(ip)->i_mode)) {
967 if (xflags & FS_XFLAG_REALTIME)
968 di_flags |= XFS_DIFLAG_REALTIME;
969 if (xflags & FS_XFLAG_EXTSIZE)
970 di_flags |= XFS_DIFLAG_EXTSIZE;
971 }
972
973 return di_flags;
974 }
975
976 STATIC uint64_t
xfs_flags2diflags2(struct xfs_inode * ip,unsigned int xflags)977 xfs_flags2diflags2(
978 struct xfs_inode *ip,
979 unsigned int xflags)
980 {
981 uint64_t di_flags2 =
982 (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK);
983
984 if (xflags & FS_XFLAG_DAX)
985 di_flags2 |= XFS_DIFLAG2_DAX;
986 if (xflags & FS_XFLAG_COWEXTSIZE)
987 di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
988
989 return di_flags2;
990 }
991
992 STATIC void
xfs_diflags_to_linux(struct xfs_inode * ip)993 xfs_diflags_to_linux(
994 struct xfs_inode *ip)
995 {
996 struct inode *inode = VFS_I(ip);
997 unsigned int xflags = xfs_ip2xflags(ip);
998
999 if (xflags & FS_XFLAG_IMMUTABLE)
1000 inode->i_flags |= S_IMMUTABLE;
1001 else
1002 inode->i_flags &= ~S_IMMUTABLE;
1003 if (xflags & FS_XFLAG_APPEND)
1004 inode->i_flags |= S_APPEND;
1005 else
1006 inode->i_flags &= ~S_APPEND;
1007 if (xflags & FS_XFLAG_SYNC)
1008 inode->i_flags |= S_SYNC;
1009 else
1010 inode->i_flags &= ~S_SYNC;
1011 if (xflags & FS_XFLAG_NOATIME)
1012 inode->i_flags |= S_NOATIME;
1013 else
1014 inode->i_flags &= ~S_NOATIME;
1015 #if 0 /* disabled until the flag switching races are sorted out */
1016 if (xflags & FS_XFLAG_DAX)
1017 inode->i_flags |= S_DAX;
1018 else
1019 inode->i_flags &= ~S_DAX;
1020 #endif
1021 }
1022
1023 static int
xfs_ioctl_setattr_xflags(struct xfs_trans * tp,struct xfs_inode * ip,struct fsxattr * fa)1024 xfs_ioctl_setattr_xflags(
1025 struct xfs_trans *tp,
1026 struct xfs_inode *ip,
1027 struct fsxattr *fa)
1028 {
1029 struct xfs_mount *mp = ip->i_mount;
1030 uint64_t di_flags2;
1031
1032 /* Can't change realtime flag if any extents are allocated. */
1033 if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
1034 XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & FS_XFLAG_REALTIME))
1035 return -EINVAL;
1036
1037 /* If realtime flag is set then must have realtime device */
1038 if (fa->fsx_xflags & FS_XFLAG_REALTIME) {
1039 if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 ||
1040 (ip->i_d.di_extsize % mp->m_sb.sb_rextsize))
1041 return -EINVAL;
1042 }
1043
1044 /* Clear reflink if we are actually able to set the rt flag. */
1045 if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip))
1046 ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
1047
1048 /* Don't allow us to set DAX mode for a reflinked file for now. */
1049 if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip))
1050 return -EINVAL;
1051
1052 /*
1053 * Can't modify an immutable/append-only file unless
1054 * we have appropriate permission.
1055 */
1056 if (((ip->i_d.di_flags & (XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND)) ||
1057 (fa->fsx_xflags & (FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND))) &&
1058 !capable(CAP_LINUX_IMMUTABLE))
1059 return -EPERM;
1060
1061 /* diflags2 only valid for v3 inodes. */
1062 di_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);
1063 if (di_flags2 && ip->i_d.di_version < 3)
1064 return -EINVAL;
1065
1066 ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags);
1067 ip->i_d.di_flags2 = di_flags2;
1068
1069 xfs_diflags_to_linux(ip);
1070 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1071 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1072 XFS_STATS_INC(mp, xs_ig_attrchg);
1073 return 0;
1074 }
1075
1076 /*
1077 * If we are changing DAX flags, we have to ensure the file is clean and any
1078 * cached objects in the address space are invalidated and removed. This
1079 * requires us to lock out other IO and page faults similar to a truncate
1080 * operation. The locks need to be held until the transaction has been committed
1081 * so that the cache invalidation is atomic with respect to the DAX flag
1082 * manipulation.
1083 */
1084 static int
xfs_ioctl_setattr_dax_invalidate(struct xfs_inode * ip,struct fsxattr * fa,int * join_flags)1085 xfs_ioctl_setattr_dax_invalidate(
1086 struct xfs_inode *ip,
1087 struct fsxattr *fa,
1088 int *join_flags)
1089 {
1090 struct inode *inode = VFS_I(ip);
1091 struct super_block *sb = inode->i_sb;
1092 int error;
1093
1094 *join_flags = 0;
1095
1096 /*
1097 * It is only valid to set the DAX flag on regular files and
1098 * directories on filesystems where the block size is equal to the page
1099 * size. On directories it serves as an inherit hint.
1100 */
1101 if (fa->fsx_xflags & FS_XFLAG_DAX) {
1102 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
1103 return -EINVAL;
1104 if (!bdev_dax_supported(xfs_find_bdev_for_inode(VFS_I(ip)),
1105 sb->s_blocksize))
1106 return -EINVAL;
1107 }
1108
1109 /* If the DAX state is not changing, we have nothing to do here. */
1110 if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode))
1111 return 0;
1112 if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode))
1113 return 0;
1114
1115 /* lock, flush and invalidate mapping in preparation for flag change */
1116 xfs_ilock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
1117 error = filemap_write_and_wait(inode->i_mapping);
1118 if (error)
1119 goto out_unlock;
1120 error = invalidate_inode_pages2(inode->i_mapping);
1121 if (error)
1122 goto out_unlock;
1123
1124 *join_flags = XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL;
1125 return 0;
1126
1127 out_unlock:
1128 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
1129 return error;
1130
1131 }
1132
1133 /*
1134 * Set up the transaction structure for the setattr operation, checking that we
1135 * have permission to do so. On success, return a clean transaction and the
1136 * inode locked exclusively ready for further operation specific checks. On
1137 * failure, return an error without modifying or locking the inode.
1138 *
1139 * The inode might already be IO locked on call. If this is the case, it is
1140 * indicated in @join_flags and we take full responsibility for ensuring they
1141 * are unlocked from now on. Hence if we have an error here, we still have to
1142 * unlock them. Otherwise, once they are joined to the transaction, they will
1143 * be unlocked on commit/cancel.
1144 */
1145 static struct xfs_trans *
xfs_ioctl_setattr_get_trans(struct xfs_inode * ip,int join_flags)1146 xfs_ioctl_setattr_get_trans(
1147 struct xfs_inode *ip,
1148 int join_flags)
1149 {
1150 struct xfs_mount *mp = ip->i_mount;
1151 struct xfs_trans *tp;
1152 int error = -EROFS;
1153
1154 if (mp->m_flags & XFS_MOUNT_RDONLY)
1155 goto out_unlock;
1156 error = -EIO;
1157 if (XFS_FORCED_SHUTDOWN(mp))
1158 goto out_unlock;
1159
1160 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
1161 if (error)
1162 return ERR_PTR(error);
1163
1164 xfs_ilock(ip, XFS_ILOCK_EXCL);
1165 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | join_flags);
1166 join_flags = 0;
1167
1168 /*
1169 * CAP_FOWNER overrides the following restrictions:
1170 *
1171 * The user ID of the calling process must be equal to the file owner
1172 * ID, except in cases where the CAP_FSETID capability is applicable.
1173 */
1174 if (!inode_owner_or_capable(VFS_I(ip))) {
1175 error = -EPERM;
1176 goto out_cancel;
1177 }
1178
1179 if (mp->m_flags & XFS_MOUNT_WSYNC)
1180 xfs_trans_set_sync(tp);
1181
1182 return tp;
1183
1184 out_cancel:
1185 xfs_trans_cancel(tp);
1186 out_unlock:
1187 if (join_flags)
1188 xfs_iunlock(ip, join_flags);
1189 return ERR_PTR(error);
1190 }
1191
1192 /*
1193 * extent size hint validation is somewhat cumbersome. Rules are:
1194 *
1195 * 1. extent size hint is only valid for directories and regular files
1196 * 2. FS_XFLAG_EXTSIZE is only valid for regular files
1197 * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
1198 * 4. can only be changed on regular files if no extents are allocated
1199 * 5. can be changed on directories at any time
1200 * 6. extsize hint of 0 turns off hints, clears inode flags.
1201 * 7. Extent size must be a multiple of the appropriate block size.
1202 * 8. for non-realtime files, the extent size hint must be limited
1203 * to half the AG size to avoid alignment extending the extent beyond the
1204 * limits of the AG.
1205 */
1206 static int
xfs_ioctl_setattr_check_extsize(struct xfs_inode * ip,struct fsxattr * fa)1207 xfs_ioctl_setattr_check_extsize(
1208 struct xfs_inode *ip,
1209 struct fsxattr *fa)
1210 {
1211 struct xfs_mount *mp = ip->i_mount;
1212
1213 if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(VFS_I(ip)->i_mode))
1214 return -EINVAL;
1215
1216 if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) &&
1217 !S_ISDIR(VFS_I(ip)->i_mode))
1218 return -EINVAL;
1219
1220 if (S_ISREG(VFS_I(ip)->i_mode) && ip->i_d.di_nextents &&
1221 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize))
1222 return -EINVAL;
1223
1224 if (fa->fsx_extsize != 0) {
1225 xfs_extlen_t size;
1226 xfs_fsblock_t extsize_fsb;
1227
1228 extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize);
1229 if (extsize_fsb > MAXEXTLEN)
1230 return -EINVAL;
1231
1232 if (XFS_IS_REALTIME_INODE(ip) ||
1233 (fa->fsx_xflags & FS_XFLAG_REALTIME)) {
1234 size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
1235 } else {
1236 size = mp->m_sb.sb_blocksize;
1237 if (extsize_fsb > mp->m_sb.sb_agblocks / 2)
1238 return -EINVAL;
1239 }
1240
1241 if (fa->fsx_extsize % size)
1242 return -EINVAL;
1243 } else
1244 fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);
1245
1246 return 0;
1247 }
1248
1249 /*
1250 * CoW extent size hint validation rules are:
1251 *
1252 * 1. CoW extent size hint can only be set if reflink is enabled on the fs.
1253 * The inode does not have to have any shared blocks, but it must be a v3.
1254 * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
1255 * for a directory, the hint is propagated to new files.
1256 * 3. Can be changed on files & directories at any time.
1257 * 4. CoW extsize hint of 0 turns off hints, clears inode flags.
1258 * 5. Extent size must be a multiple of the appropriate block size.
1259 * 6. The extent size hint must be limited to half the AG size to avoid
1260 * alignment extending the extent beyond the limits of the AG.
1261 */
1262 static int
xfs_ioctl_setattr_check_cowextsize(struct xfs_inode * ip,struct fsxattr * fa)1263 xfs_ioctl_setattr_check_cowextsize(
1264 struct xfs_inode *ip,
1265 struct fsxattr *fa)
1266 {
1267 struct xfs_mount *mp = ip->i_mount;
1268
1269 if (!(fa->fsx_xflags & FS_XFLAG_COWEXTSIZE))
1270 return 0;
1271
1272 if (!xfs_sb_version_hasreflink(&ip->i_mount->m_sb) ||
1273 ip->i_d.di_version != 3)
1274 return -EINVAL;
1275
1276 if (!S_ISREG(VFS_I(ip)->i_mode) && !S_ISDIR(VFS_I(ip)->i_mode))
1277 return -EINVAL;
1278
1279 if (fa->fsx_cowextsize != 0) {
1280 xfs_extlen_t size;
1281 xfs_fsblock_t cowextsize_fsb;
1282
1283 cowextsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_cowextsize);
1284 if (cowextsize_fsb > MAXEXTLEN)
1285 return -EINVAL;
1286
1287 size = mp->m_sb.sb_blocksize;
1288 if (cowextsize_fsb > mp->m_sb.sb_agblocks / 2)
1289 return -EINVAL;
1290
1291 if (fa->fsx_cowextsize % size)
1292 return -EINVAL;
1293 } else
1294 fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;
1295
1296 return 0;
1297 }
1298
1299 static int
xfs_ioctl_setattr_check_projid(struct xfs_inode * ip,struct fsxattr * fa)1300 xfs_ioctl_setattr_check_projid(
1301 struct xfs_inode *ip,
1302 struct fsxattr *fa)
1303 {
1304 /* Disallow 32bit project ids if projid32bit feature is not enabled. */
1305 if (fa->fsx_projid > (uint16_t)-1 &&
1306 !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
1307 return -EINVAL;
1308
1309 /*
1310 * Project Quota ID state is only allowed to change from within the init
1311 * namespace. Enforce that restriction only if we are trying to change
1312 * the quota ID state. Everything else is allowed in user namespaces.
1313 */
1314 if (current_user_ns() == &init_user_ns)
1315 return 0;
1316
1317 if (xfs_get_projid(ip) != fa->fsx_projid)
1318 return -EINVAL;
1319 if ((fa->fsx_xflags & FS_XFLAG_PROJINHERIT) !=
1320 (ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
1321 return -EINVAL;
1322
1323 return 0;
1324 }
1325
1326 STATIC int
xfs_ioctl_setattr(xfs_inode_t * ip,struct fsxattr * fa)1327 xfs_ioctl_setattr(
1328 xfs_inode_t *ip,
1329 struct fsxattr *fa)
1330 {
1331 struct xfs_mount *mp = ip->i_mount;
1332 struct xfs_trans *tp;
1333 struct xfs_dquot *udqp = NULL;
1334 struct xfs_dquot *pdqp = NULL;
1335 struct xfs_dquot *olddquot = NULL;
1336 int code;
1337 int join_flags = 0;
1338
1339 trace_xfs_ioctl_setattr(ip);
1340
1341 code = xfs_ioctl_setattr_check_projid(ip, fa);
1342 if (code)
1343 return code;
1344
1345 /*
1346 * If disk quotas is on, we make sure that the dquots do exist on disk,
1347 * before we start any other transactions. Trying to do this later
1348 * is messy. We don't care to take a readlock to look at the ids
1349 * in inode here, because we can't hold it across the trans_reserve.
1350 * If the IDs do change before we take the ilock, we're covered
1351 * because the i_*dquot fields will get updated anyway.
1352 */
1353 if (XFS_IS_QUOTA_ON(mp)) {
1354 code = xfs_qm_vop_dqalloc(ip, ip->i_d.di_uid,
1355 ip->i_d.di_gid, fa->fsx_projid,
1356 XFS_QMOPT_PQUOTA, &udqp, NULL, &pdqp);
1357 if (code)
1358 return code;
1359 }
1360
1361 /*
1362 * Changing DAX config may require inode locking for mapping
1363 * invalidation. These need to be held all the way to transaction commit
1364 * or cancel time, so need to be passed through to
1365 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
1366 * appropriately.
1367 */
1368 code = xfs_ioctl_setattr_dax_invalidate(ip, fa, &join_flags);
1369 if (code)
1370 goto error_free_dquots;
1371
1372 tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
1373 if (IS_ERR(tp)) {
1374 code = PTR_ERR(tp);
1375 goto error_free_dquots;
1376 }
1377
1378
1379 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) &&
1380 xfs_get_projid(ip) != fa->fsx_projid) {
1381 code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, pdqp,
1382 capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0);
1383 if (code) /* out of quota */
1384 goto error_trans_cancel;
1385 }
1386
1387 code = xfs_ioctl_setattr_check_extsize(ip, fa);
1388 if (code)
1389 goto error_trans_cancel;
1390
1391 code = xfs_ioctl_setattr_check_cowextsize(ip, fa);
1392 if (code)
1393 goto error_trans_cancel;
1394
1395 code = xfs_ioctl_setattr_xflags(tp, ip, fa);
1396 if (code)
1397 goto error_trans_cancel;
1398
1399 /*
1400 * Change file ownership. Must be the owner or privileged. CAP_FSETID
1401 * overrides the following restrictions:
1402 *
1403 * The set-user-ID and set-group-ID bits of a file will be cleared upon
1404 * successful return from chown()
1405 */
1406
1407 if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) &&
1408 !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID))
1409 VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID);
1410
1411 /* Change the ownerships and register project quota modifications */
1412 if (xfs_get_projid(ip) != fa->fsx_projid) {
1413 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) {
1414 olddquot = xfs_qm_vop_chown(tp, ip,
1415 &ip->i_pdquot, pdqp);
1416 }
1417 ASSERT(ip->i_d.di_version > 1);
1418 xfs_set_projid(ip, fa->fsx_projid);
1419 }
1420
1421 /*
1422 * Only set the extent size hint if we've already determined that the
1423 * extent size hint should be set on the inode. If no extent size flags
1424 * are set on the inode then unconditionally clear the extent size hint.
1425 */
1426 if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT))
1427 ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
1428 else
1429 ip->i_d.di_extsize = 0;
1430 if (ip->i_d.di_version == 3 &&
1431 (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE))
1432 ip->i_d.di_cowextsize = fa->fsx_cowextsize >>
1433 mp->m_sb.sb_blocklog;
1434 else
1435 ip->i_d.di_cowextsize = 0;
1436
1437 code = xfs_trans_commit(tp);
1438
1439 /*
1440 * Release any dquot(s) the inode had kept before chown.
1441 */
1442 xfs_qm_dqrele(olddquot);
1443 xfs_qm_dqrele(udqp);
1444 xfs_qm_dqrele(pdqp);
1445
1446 return code;
1447
1448 error_trans_cancel:
1449 xfs_trans_cancel(tp);
1450 error_free_dquots:
1451 xfs_qm_dqrele(udqp);
1452 xfs_qm_dqrele(pdqp);
1453 return code;
1454 }
1455
1456 STATIC int
xfs_ioc_fssetxattr(xfs_inode_t * ip,struct file * filp,void __user * arg)1457 xfs_ioc_fssetxattr(
1458 xfs_inode_t *ip,
1459 struct file *filp,
1460 void __user *arg)
1461 {
1462 struct fsxattr fa;
1463 int error;
1464
1465 if (copy_from_user(&fa, arg, sizeof(fa)))
1466 return -EFAULT;
1467
1468 error = mnt_want_write_file(filp);
1469 if (error)
1470 return error;
1471 error = xfs_ioctl_setattr(ip, &fa);
1472 mnt_drop_write_file(filp);
1473 return error;
1474 }
1475
1476 STATIC int
xfs_ioc_getxflags(xfs_inode_t * ip,void __user * arg)1477 xfs_ioc_getxflags(
1478 xfs_inode_t *ip,
1479 void __user *arg)
1480 {
1481 unsigned int flags;
1482
1483 flags = xfs_di2lxflags(ip->i_d.di_flags);
1484 if (copy_to_user(arg, &flags, sizeof(flags)))
1485 return -EFAULT;
1486 return 0;
1487 }
1488
1489 STATIC int
xfs_ioc_setxflags(struct xfs_inode * ip,struct file * filp,void __user * arg)1490 xfs_ioc_setxflags(
1491 struct xfs_inode *ip,
1492 struct file *filp,
1493 void __user *arg)
1494 {
1495 struct xfs_trans *tp;
1496 struct fsxattr fa;
1497 unsigned int flags;
1498 int join_flags = 0;
1499 int error;
1500
1501 if (copy_from_user(&flags, arg, sizeof(flags)))
1502 return -EFAULT;
1503
1504 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
1505 FS_NOATIME_FL | FS_NODUMP_FL | \
1506 FS_SYNC_FL))
1507 return -EOPNOTSUPP;
1508
1509 fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
1510
1511 error = mnt_want_write_file(filp);
1512 if (error)
1513 return error;
1514
1515 /*
1516 * Changing DAX config may require inode locking for mapping
1517 * invalidation. These need to be held all the way to transaction commit
1518 * or cancel time, so need to be passed through to
1519 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
1520 * appropriately.
1521 */
1522 error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags);
1523 if (error)
1524 goto out_drop_write;
1525
1526 tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
1527 if (IS_ERR(tp)) {
1528 error = PTR_ERR(tp);
1529 goto out_drop_write;
1530 }
1531
1532 error = xfs_ioctl_setattr_xflags(tp, ip, &fa);
1533 if (error) {
1534 xfs_trans_cancel(tp);
1535 goto out_drop_write;
1536 }
1537
1538 error = xfs_trans_commit(tp);
1539 out_drop_write:
1540 mnt_drop_write_file(filp);
1541 return error;
1542 }
1543
1544 STATIC int
xfs_getbmap_format(void ** ap,struct getbmapx * bmv)1545 xfs_getbmap_format(void **ap, struct getbmapx *bmv)
1546 {
1547 struct getbmap __user *base = (struct getbmap __user *)*ap;
1548
1549 /* copy only getbmap portion (not getbmapx) */
1550 if (copy_to_user(base, bmv, sizeof(struct getbmap)))
1551 return -EFAULT;
1552
1553 *ap += sizeof(struct getbmap);
1554 return 0;
1555 }
1556
1557 STATIC int
xfs_ioc_getbmap(struct file * file,unsigned int cmd,void __user * arg)1558 xfs_ioc_getbmap(
1559 struct file *file,
1560 unsigned int cmd,
1561 void __user *arg)
1562 {
1563 struct getbmapx bmx = { 0 };
1564 int error;
1565
1566 /* struct getbmap is a strict subset of struct getbmapx. */
1567 if (copy_from_user(&bmx, arg, offsetof(struct getbmapx, bmv_iflags)))
1568 return -EFAULT;
1569
1570 if (bmx.bmv_count < 2)
1571 return -EINVAL;
1572
1573 bmx.bmv_iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
1574 if (file->f_mode & FMODE_NOCMTIME)
1575 bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
1576
1577 error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, xfs_getbmap_format,
1578 (__force struct getbmap *)arg+1);
1579 if (error)
1580 return error;
1581
1582 /* copy back header - only size of getbmap */
1583 if (copy_to_user(arg, &bmx, sizeof(struct getbmap)))
1584 return -EFAULT;
1585 return 0;
1586 }
1587
1588 STATIC int
xfs_getbmapx_format(void ** ap,struct getbmapx * bmv)1589 xfs_getbmapx_format(void **ap, struct getbmapx *bmv)
1590 {
1591 struct getbmapx __user *base = (struct getbmapx __user *)*ap;
1592
1593 if (copy_to_user(base, bmv, sizeof(struct getbmapx)))
1594 return -EFAULT;
1595
1596 *ap += sizeof(struct getbmapx);
1597 return 0;
1598 }
1599
1600 STATIC int
xfs_ioc_getbmapx(struct xfs_inode * ip,void __user * arg)1601 xfs_ioc_getbmapx(
1602 struct xfs_inode *ip,
1603 void __user *arg)
1604 {
1605 struct getbmapx bmx;
1606 int error;
1607
1608 if (copy_from_user(&bmx, arg, sizeof(bmx)))
1609 return -EFAULT;
1610
1611 if (bmx.bmv_count < 2)
1612 return -EINVAL;
1613
1614 if (bmx.bmv_iflags & (~BMV_IF_VALID))
1615 return -EINVAL;
1616
1617 error = xfs_getbmap(ip, &bmx, xfs_getbmapx_format,
1618 (__force struct getbmapx *)arg+1);
1619 if (error)
1620 return error;
1621
1622 /* copy back header */
1623 if (copy_to_user(arg, &bmx, sizeof(struct getbmapx)))
1624 return -EFAULT;
1625
1626 return 0;
1627 }
1628
1629 struct getfsmap_info {
1630 struct xfs_mount *mp;
1631 struct fsmap_head __user *data;
1632 unsigned int idx;
1633 __u32 last_flags;
1634 };
1635
1636 STATIC int
xfs_getfsmap_format(struct xfs_fsmap * xfm,void * priv)1637 xfs_getfsmap_format(struct xfs_fsmap *xfm, void *priv)
1638 {
1639 struct getfsmap_info *info = priv;
1640 struct fsmap fm;
1641
1642 trace_xfs_getfsmap_mapping(info->mp, xfm);
1643
1644 info->last_flags = xfm->fmr_flags;
1645 xfs_fsmap_from_internal(&fm, xfm);
1646 if (copy_to_user(&info->data->fmh_recs[info->idx++], &fm,
1647 sizeof(struct fsmap)))
1648 return -EFAULT;
1649
1650 return 0;
1651 }
1652
1653 STATIC int
xfs_ioc_getfsmap(struct xfs_inode * ip,struct fsmap_head __user * arg)1654 xfs_ioc_getfsmap(
1655 struct xfs_inode *ip,
1656 struct fsmap_head __user *arg)
1657 {
1658 struct getfsmap_info info = { NULL };
1659 struct xfs_fsmap_head xhead = {0};
1660 struct fsmap_head head;
1661 bool aborted = false;
1662 int error;
1663
1664 if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
1665 return -EFAULT;
1666 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
1667 memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
1668 sizeof(head.fmh_keys[0].fmr_reserved)) ||
1669 memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
1670 sizeof(head.fmh_keys[1].fmr_reserved)))
1671 return -EINVAL;
1672
1673 xhead.fmh_iflags = head.fmh_iflags;
1674 xhead.fmh_count = head.fmh_count;
1675 xfs_fsmap_to_internal(&xhead.fmh_keys[0], &head.fmh_keys[0]);
1676 xfs_fsmap_to_internal(&xhead.fmh_keys[1], &head.fmh_keys[1]);
1677
1678 trace_xfs_getfsmap_low_key(ip->i_mount, &xhead.fmh_keys[0]);
1679 trace_xfs_getfsmap_high_key(ip->i_mount, &xhead.fmh_keys[1]);
1680
1681 info.mp = ip->i_mount;
1682 info.data = arg;
1683 error = xfs_getfsmap(ip->i_mount, &xhead, xfs_getfsmap_format, &info);
1684 if (error == XFS_BTREE_QUERY_RANGE_ABORT) {
1685 error = 0;
1686 aborted = true;
1687 } else if (error)
1688 return error;
1689
1690 /* If we didn't abort, set the "last" flag in the last fmx */
1691 if (!aborted && info.idx) {
1692 info.last_flags |= FMR_OF_LAST;
1693 if (copy_to_user(&info.data->fmh_recs[info.idx - 1].fmr_flags,
1694 &info.last_flags, sizeof(info.last_flags)))
1695 return -EFAULT;
1696 }
1697
1698 /* copy back header */
1699 head.fmh_entries = xhead.fmh_entries;
1700 head.fmh_oflags = xhead.fmh_oflags;
1701 if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
1702 return -EFAULT;
1703
1704 return 0;
1705 }
1706
1707 int
xfs_ioc_swapext(xfs_swapext_t * sxp)1708 xfs_ioc_swapext(
1709 xfs_swapext_t *sxp)
1710 {
1711 xfs_inode_t *ip, *tip;
1712 struct fd f, tmp;
1713 int error = 0;
1714
1715 /* Pull information for the target fd */
1716 f = fdget((int)sxp->sx_fdtarget);
1717 if (!f.file) {
1718 error = -EINVAL;
1719 goto out;
1720 }
1721
1722 if (!(f.file->f_mode & FMODE_WRITE) ||
1723 !(f.file->f_mode & FMODE_READ) ||
1724 (f.file->f_flags & O_APPEND)) {
1725 error = -EBADF;
1726 goto out_put_file;
1727 }
1728
1729 tmp = fdget((int)sxp->sx_fdtmp);
1730 if (!tmp.file) {
1731 error = -EINVAL;
1732 goto out_put_file;
1733 }
1734
1735 if (!(tmp.file->f_mode & FMODE_WRITE) ||
1736 !(tmp.file->f_mode & FMODE_READ) ||
1737 (tmp.file->f_flags & O_APPEND)) {
1738 error = -EBADF;
1739 goto out_put_tmp_file;
1740 }
1741
1742 if (IS_SWAPFILE(file_inode(f.file)) ||
1743 IS_SWAPFILE(file_inode(tmp.file))) {
1744 error = -EINVAL;
1745 goto out_put_tmp_file;
1746 }
1747
1748 /*
1749 * We need to ensure that the fds passed in point to XFS inodes
1750 * before we cast and access them as XFS structures as we have no
1751 * control over what the user passes us here.
1752 */
1753 if (f.file->f_op != &xfs_file_operations ||
1754 tmp.file->f_op != &xfs_file_operations) {
1755 error = -EINVAL;
1756 goto out_put_tmp_file;
1757 }
1758
1759 ip = XFS_I(file_inode(f.file));
1760 tip = XFS_I(file_inode(tmp.file));
1761
1762 if (ip->i_mount != tip->i_mount) {
1763 error = -EINVAL;
1764 goto out_put_tmp_file;
1765 }
1766
1767 if (ip->i_ino == tip->i_ino) {
1768 error = -EINVAL;
1769 goto out_put_tmp_file;
1770 }
1771
1772 if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
1773 error = -EIO;
1774 goto out_put_tmp_file;
1775 }
1776
1777 error = xfs_swap_extents(ip, tip, sxp);
1778
1779 out_put_tmp_file:
1780 fdput(tmp);
1781 out_put_file:
1782 fdput(f);
1783 out:
1784 return error;
1785 }
1786
1787 /*
1788 * Note: some of the ioctl's return positive numbers as a
1789 * byte count indicating success, such as readlink_by_handle.
1790 * So we don't "sign flip" like most other routines. This means
1791 * true errors need to be returned as a negative value.
1792 */
1793 long
xfs_file_ioctl(struct file * filp,unsigned int cmd,unsigned long p)1794 xfs_file_ioctl(
1795 struct file *filp,
1796 unsigned int cmd,
1797 unsigned long p)
1798 {
1799 struct inode *inode = file_inode(filp);
1800 struct xfs_inode *ip = XFS_I(inode);
1801 struct xfs_mount *mp = ip->i_mount;
1802 void __user *arg = (void __user *)p;
1803 int error;
1804
1805 trace_xfs_file_ioctl(ip);
1806
1807 switch (cmd) {
1808 case FITRIM:
1809 return xfs_ioc_trim(mp, arg);
1810 case XFS_IOC_ALLOCSP:
1811 case XFS_IOC_FREESP:
1812 case XFS_IOC_RESVSP:
1813 case XFS_IOC_UNRESVSP:
1814 case XFS_IOC_ALLOCSP64:
1815 case XFS_IOC_FREESP64:
1816 case XFS_IOC_RESVSP64:
1817 case XFS_IOC_UNRESVSP64:
1818 case XFS_IOC_ZERO_RANGE: {
1819 xfs_flock64_t bf;
1820
1821 if (copy_from_user(&bf, arg, sizeof(bf)))
1822 return -EFAULT;
1823 return xfs_ioc_space(filp, cmd, &bf);
1824 }
1825 case XFS_IOC_DIOINFO: {
1826 struct dioattr da;
1827 xfs_buftarg_t *target =
1828 XFS_IS_REALTIME_INODE(ip) ?
1829 mp->m_rtdev_targp : mp->m_ddev_targp;
1830
1831 da.d_mem = da.d_miniosz = target->bt_logical_sectorsize;
1832 da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
1833
1834 if (copy_to_user(arg, &da, sizeof(da)))
1835 return -EFAULT;
1836 return 0;
1837 }
1838
1839 case XFS_IOC_FSBULKSTAT_SINGLE:
1840 case XFS_IOC_FSBULKSTAT:
1841 case XFS_IOC_FSINUMBERS:
1842 return xfs_ioc_bulkstat(mp, cmd, arg);
1843
1844 case XFS_IOC_FSGEOMETRY_V1:
1845 return xfs_ioc_fsgeometry_v1(mp, arg);
1846
1847 case XFS_IOC_FSGEOMETRY:
1848 return xfs_ioc_fsgeometry(mp, arg);
1849
1850 case XFS_IOC_GETVERSION:
1851 return put_user(inode->i_generation, (int __user *)arg);
1852
1853 case XFS_IOC_FSGETXATTR:
1854 return xfs_ioc_fsgetxattr(ip, 0, arg);
1855 case XFS_IOC_FSGETXATTRA:
1856 return xfs_ioc_fsgetxattr(ip, 1, arg);
1857 case XFS_IOC_FSSETXATTR:
1858 return xfs_ioc_fssetxattr(ip, filp, arg);
1859 case XFS_IOC_GETXFLAGS:
1860 return xfs_ioc_getxflags(ip, arg);
1861 case XFS_IOC_SETXFLAGS:
1862 return xfs_ioc_setxflags(ip, filp, arg);
1863
1864 case XFS_IOC_FSSETDM: {
1865 struct fsdmidata dmi;
1866
1867 if (copy_from_user(&dmi, arg, sizeof(dmi)))
1868 return -EFAULT;
1869
1870 error = mnt_want_write_file(filp);
1871 if (error)
1872 return error;
1873
1874 error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
1875 dmi.fsd_dmstate);
1876 mnt_drop_write_file(filp);
1877 return error;
1878 }
1879
1880 case XFS_IOC_GETBMAP:
1881 case XFS_IOC_GETBMAPA:
1882 return xfs_ioc_getbmap(filp, cmd, arg);
1883
1884 case XFS_IOC_GETBMAPX:
1885 return xfs_ioc_getbmapx(ip, arg);
1886
1887 case FS_IOC_GETFSMAP:
1888 return xfs_ioc_getfsmap(ip, arg);
1889
1890 case XFS_IOC_FD_TO_HANDLE:
1891 case XFS_IOC_PATH_TO_HANDLE:
1892 case XFS_IOC_PATH_TO_FSHANDLE: {
1893 xfs_fsop_handlereq_t hreq;
1894
1895 if (copy_from_user(&hreq, arg, sizeof(hreq)))
1896 return -EFAULT;
1897 return xfs_find_handle(cmd, &hreq);
1898 }
1899 case XFS_IOC_OPEN_BY_HANDLE: {
1900 xfs_fsop_handlereq_t hreq;
1901
1902 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1903 return -EFAULT;
1904 return xfs_open_by_handle(filp, &hreq);
1905 }
1906 case XFS_IOC_FSSETDM_BY_HANDLE:
1907 return xfs_fssetdm_by_handle(filp, arg);
1908
1909 case XFS_IOC_READLINK_BY_HANDLE: {
1910 xfs_fsop_handlereq_t hreq;
1911
1912 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1913 return -EFAULT;
1914 return xfs_readlink_by_handle(filp, &hreq);
1915 }
1916 case XFS_IOC_ATTRLIST_BY_HANDLE:
1917 return xfs_attrlist_by_handle(filp, arg);
1918
1919 case XFS_IOC_ATTRMULTI_BY_HANDLE:
1920 return xfs_attrmulti_by_handle(filp, arg);
1921
1922 case XFS_IOC_SWAPEXT: {
1923 struct xfs_swapext sxp;
1924
1925 if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
1926 return -EFAULT;
1927 error = mnt_want_write_file(filp);
1928 if (error)
1929 return error;
1930 error = xfs_ioc_swapext(&sxp);
1931 mnt_drop_write_file(filp);
1932 return error;
1933 }
1934
1935 case XFS_IOC_FSCOUNTS: {
1936 xfs_fsop_counts_t out;
1937
1938 error = xfs_fs_counts(mp, &out);
1939 if (error)
1940 return error;
1941
1942 if (copy_to_user(arg, &out, sizeof(out)))
1943 return -EFAULT;
1944 return 0;
1945 }
1946
1947 case XFS_IOC_SET_RESBLKS: {
1948 xfs_fsop_resblks_t inout;
1949 uint64_t in;
1950
1951 if (!capable(CAP_SYS_ADMIN))
1952 return -EPERM;
1953
1954 if (mp->m_flags & XFS_MOUNT_RDONLY)
1955 return -EROFS;
1956
1957 if (copy_from_user(&inout, arg, sizeof(inout)))
1958 return -EFAULT;
1959
1960 error = mnt_want_write_file(filp);
1961 if (error)
1962 return error;
1963
1964 /* input parameter is passed in resblks field of structure */
1965 in = inout.resblks;
1966 error = xfs_reserve_blocks(mp, &in, &inout);
1967 mnt_drop_write_file(filp);
1968 if (error)
1969 return error;
1970
1971 if (copy_to_user(arg, &inout, sizeof(inout)))
1972 return -EFAULT;
1973 return 0;
1974 }
1975
1976 case XFS_IOC_GET_RESBLKS: {
1977 xfs_fsop_resblks_t out;
1978
1979 if (!capable(CAP_SYS_ADMIN))
1980 return -EPERM;
1981
1982 error = xfs_reserve_blocks(mp, NULL, &out);
1983 if (error)
1984 return error;
1985
1986 if (copy_to_user(arg, &out, sizeof(out)))
1987 return -EFAULT;
1988
1989 return 0;
1990 }
1991
1992 case XFS_IOC_FSGROWFSDATA: {
1993 xfs_growfs_data_t in;
1994
1995 if (copy_from_user(&in, arg, sizeof(in)))
1996 return -EFAULT;
1997
1998 error = mnt_want_write_file(filp);
1999 if (error)
2000 return error;
2001 error = xfs_growfs_data(mp, &in);
2002 mnt_drop_write_file(filp);
2003 return error;
2004 }
2005
2006 case XFS_IOC_FSGROWFSLOG: {
2007 xfs_growfs_log_t in;
2008
2009 if (copy_from_user(&in, arg, sizeof(in)))
2010 return -EFAULT;
2011
2012 error = mnt_want_write_file(filp);
2013 if (error)
2014 return error;
2015 error = xfs_growfs_log(mp, &in);
2016 mnt_drop_write_file(filp);
2017 return error;
2018 }
2019
2020 case XFS_IOC_FSGROWFSRT: {
2021 xfs_growfs_rt_t in;
2022
2023 if (copy_from_user(&in, arg, sizeof(in)))
2024 return -EFAULT;
2025
2026 error = mnt_want_write_file(filp);
2027 if (error)
2028 return error;
2029 error = xfs_growfs_rt(mp, &in);
2030 mnt_drop_write_file(filp);
2031 return error;
2032 }
2033
2034 case XFS_IOC_GOINGDOWN: {
2035 uint32_t in;
2036
2037 if (!capable(CAP_SYS_ADMIN))
2038 return -EPERM;
2039
2040 if (get_user(in, (uint32_t __user *)arg))
2041 return -EFAULT;
2042
2043 return xfs_fs_goingdown(mp, in);
2044 }
2045
2046 case XFS_IOC_ERROR_INJECTION: {
2047 xfs_error_injection_t in;
2048
2049 if (!capable(CAP_SYS_ADMIN))
2050 return -EPERM;
2051
2052 if (copy_from_user(&in, arg, sizeof(in)))
2053 return -EFAULT;
2054
2055 return xfs_errortag_add(mp, in.errtag);
2056 }
2057
2058 case XFS_IOC_ERROR_CLEARALL:
2059 if (!capable(CAP_SYS_ADMIN))
2060 return -EPERM;
2061
2062 return xfs_errortag_clearall(mp);
2063
2064 case XFS_IOC_FREE_EOFBLOCKS: {
2065 struct xfs_fs_eofblocks eofb;
2066 struct xfs_eofblocks keofb;
2067
2068 if (!capable(CAP_SYS_ADMIN))
2069 return -EPERM;
2070
2071 if (mp->m_flags & XFS_MOUNT_RDONLY)
2072 return -EROFS;
2073
2074 if (copy_from_user(&eofb, arg, sizeof(eofb)))
2075 return -EFAULT;
2076
2077 error = xfs_fs_eofblocks_from_user(&eofb, &keofb);
2078 if (error)
2079 return error;
2080
2081 return xfs_icache_free_eofblocks(mp, &keofb);
2082 }
2083
2084 default:
2085 return -ENOTTY;
2086 }
2087 }
2088