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
45 #include <linux/capability.h>
46 #include <linux/dcache.h>
47 #include <linux/mount.h>
48 #include <linux/namei.h>
49 #include <linux/pagemap.h>
50 #include <linux/slab.h>
51 #include <linux/exportfs.h>
52
53 /*
54 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
55 * a file or fs handle.
56 *
57 * XFS_IOC_PATH_TO_FSHANDLE
58 * returns fs handle for a mount point or path within that mount point
59 * XFS_IOC_FD_TO_HANDLE
60 * returns full handle for a FD opened in user space
61 * XFS_IOC_PATH_TO_HANDLE
62 * returns full handle for a path
63 */
64 int
xfs_find_handle(unsigned int cmd,xfs_fsop_handlereq_t * hreq)65 xfs_find_handle(
66 unsigned int cmd,
67 xfs_fsop_handlereq_t *hreq)
68 {
69 int hsize;
70 xfs_handle_t handle;
71 struct inode *inode;
72 struct fd f = {NULL};
73 struct path path;
74 int error;
75 struct xfs_inode *ip;
76
77 if (cmd == XFS_IOC_FD_TO_HANDLE) {
78 f = fdget(hreq->fd);
79 if (!f.file)
80 return -EBADF;
81 inode = file_inode(f.file);
82 } else {
83 error = user_lpath((const char __user *)hreq->path, &path);
84 if (error)
85 return error;
86 inode = d_inode(path.dentry);
87 }
88 ip = XFS_I(inode);
89
90 /*
91 * We can only generate handles for inodes residing on a XFS filesystem,
92 * and only for regular files, directories or symbolic links.
93 */
94 error = -EINVAL;
95 if (inode->i_sb->s_magic != XFS_SB_MAGIC)
96 goto out_put;
97
98 error = -EBADF;
99 if (!S_ISREG(inode->i_mode) &&
100 !S_ISDIR(inode->i_mode) &&
101 !S_ISLNK(inode->i_mode))
102 goto out_put;
103
104
105 memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));
106
107 if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
108 /*
109 * This handle only contains an fsid, zero the rest.
110 */
111 memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
112 hsize = sizeof(xfs_fsid_t);
113 } else {
114 handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
115 sizeof(handle.ha_fid.fid_len);
116 handle.ha_fid.fid_pad = 0;
117 handle.ha_fid.fid_gen = ip->i_d.di_gen;
118 handle.ha_fid.fid_ino = ip->i_ino;
119
120 hsize = XFS_HSIZE(handle);
121 }
122
123 error = -EFAULT;
124 if (copy_to_user(hreq->ohandle, &handle, hsize) ||
125 copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
126 goto out_put;
127
128 error = 0;
129
130 out_put:
131 if (cmd == XFS_IOC_FD_TO_HANDLE)
132 fdput(f);
133 else
134 path_put(&path);
135 return error;
136 }
137
138 /*
139 * No need to do permission checks on the various pathname components
140 * as the handle operations are privileged.
141 */
142 STATIC int
xfs_handle_acceptable(void * context,struct dentry * dentry)143 xfs_handle_acceptable(
144 void *context,
145 struct dentry *dentry)
146 {
147 return 1;
148 }
149
150 /*
151 * Convert userspace handle data into a dentry.
152 */
153 struct dentry *
xfs_handle_to_dentry(struct file * parfilp,void __user * uhandle,u32 hlen)154 xfs_handle_to_dentry(
155 struct file *parfilp,
156 void __user *uhandle,
157 u32 hlen)
158 {
159 xfs_handle_t handle;
160 struct xfs_fid64 fid;
161
162 /*
163 * Only allow handle opens under a directory.
164 */
165 if (!S_ISDIR(file_inode(parfilp)->i_mode))
166 return ERR_PTR(-ENOTDIR);
167
168 if (hlen != sizeof(xfs_handle_t))
169 return ERR_PTR(-EINVAL);
170 if (copy_from_user(&handle, uhandle, hlen))
171 return ERR_PTR(-EFAULT);
172 if (handle.ha_fid.fid_len !=
173 sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
174 return ERR_PTR(-EINVAL);
175
176 memset(&fid, 0, sizeof(struct fid));
177 fid.ino = handle.ha_fid.fid_ino;
178 fid.gen = handle.ha_fid.fid_gen;
179
180 return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
181 FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
182 xfs_handle_acceptable, NULL);
183 }
184
185 STATIC struct dentry *
xfs_handlereq_to_dentry(struct file * parfilp,xfs_fsop_handlereq_t * hreq)186 xfs_handlereq_to_dentry(
187 struct file *parfilp,
188 xfs_fsop_handlereq_t *hreq)
189 {
190 return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
191 }
192
193 int
xfs_open_by_handle(struct file * parfilp,xfs_fsop_handlereq_t * hreq)194 xfs_open_by_handle(
195 struct file *parfilp,
196 xfs_fsop_handlereq_t *hreq)
197 {
198 const struct cred *cred = current_cred();
199 int error;
200 int fd;
201 int permflag;
202 struct file *filp;
203 struct inode *inode;
204 struct dentry *dentry;
205 fmode_t fmode;
206 struct path path;
207
208 if (!capable(CAP_SYS_ADMIN))
209 return -EPERM;
210
211 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
212 if (IS_ERR(dentry))
213 return PTR_ERR(dentry);
214 inode = d_inode(dentry);
215
216 /* Restrict xfs_open_by_handle to directories & regular files. */
217 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
218 error = -EPERM;
219 goto out_dput;
220 }
221
222 #if BITS_PER_LONG != 32
223 hreq->oflags |= O_LARGEFILE;
224 #endif
225
226 permflag = hreq->oflags;
227 fmode = OPEN_FMODE(permflag);
228 if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
229 (fmode & FMODE_WRITE) && IS_APPEND(inode)) {
230 error = -EPERM;
231 goto out_dput;
232 }
233
234 if ((fmode & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
235 error = -EACCES;
236 goto out_dput;
237 }
238
239 /* Can't write directories. */
240 if (S_ISDIR(inode->i_mode) && (fmode & FMODE_WRITE)) {
241 error = -EISDIR;
242 goto out_dput;
243 }
244
245 fd = get_unused_fd_flags(0);
246 if (fd < 0) {
247 error = fd;
248 goto out_dput;
249 }
250
251 path.mnt = parfilp->f_path.mnt;
252 path.dentry = dentry;
253 filp = dentry_open(&path, hreq->oflags, cred);
254 dput(dentry);
255 if (IS_ERR(filp)) {
256 put_unused_fd(fd);
257 return PTR_ERR(filp);
258 }
259
260 if (S_ISREG(inode->i_mode)) {
261 filp->f_flags |= O_NOATIME;
262 filp->f_mode |= FMODE_NOCMTIME;
263 }
264
265 fd_install(fd, filp);
266 return fd;
267
268 out_dput:
269 dput(dentry);
270 return error;
271 }
272
273 int
xfs_readlink_by_handle(struct file * parfilp,xfs_fsop_handlereq_t * hreq)274 xfs_readlink_by_handle(
275 struct file *parfilp,
276 xfs_fsop_handlereq_t *hreq)
277 {
278 struct dentry *dentry;
279 __u32 olen;
280 void *link;
281 int error;
282
283 if (!capable(CAP_SYS_ADMIN))
284 return -EPERM;
285
286 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
287 if (IS_ERR(dentry))
288 return PTR_ERR(dentry);
289
290 /* Restrict this handle operation to symlinks only. */
291 if (!d_is_symlink(dentry)) {
292 error = -EINVAL;
293 goto out_dput;
294 }
295
296 if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
297 error = -EFAULT;
298 goto out_dput;
299 }
300
301 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
302 if (!link) {
303 error = -ENOMEM;
304 goto out_dput;
305 }
306
307 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
308 if (error)
309 goto out_kfree;
310 error = readlink_copy(hreq->ohandle, olen, link);
311 if (error)
312 goto out_kfree;
313
314 out_kfree:
315 kfree(link);
316 out_dput:
317 dput(dentry);
318 return error;
319 }
320
321 int
xfs_set_dmattrs(xfs_inode_t * ip,u_int evmask,u_int16_t state)322 xfs_set_dmattrs(
323 xfs_inode_t *ip,
324 u_int evmask,
325 u_int16_t state)
326 {
327 xfs_mount_t *mp = ip->i_mount;
328 xfs_trans_t *tp;
329 int error;
330
331 if (!capable(CAP_SYS_ADMIN))
332 return -EPERM;
333
334 if (XFS_FORCED_SHUTDOWN(mp))
335 return -EIO;
336
337 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
338 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
339 if (error) {
340 xfs_trans_cancel(tp);
341 return error;
342 }
343 xfs_ilock(ip, XFS_ILOCK_EXCL);
344 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
345
346 ip->i_d.di_dmevmask = evmask;
347 ip->i_d.di_dmstate = state;
348
349 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
350 error = xfs_trans_commit(tp);
351
352 return error;
353 }
354
355 STATIC int
xfs_fssetdm_by_handle(struct file * parfilp,void __user * arg)356 xfs_fssetdm_by_handle(
357 struct file *parfilp,
358 void __user *arg)
359 {
360 int error;
361 struct fsdmidata fsd;
362 xfs_fsop_setdm_handlereq_t dmhreq;
363 struct dentry *dentry;
364
365 if (!capable(CAP_MKNOD))
366 return -EPERM;
367 if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
368 return -EFAULT;
369
370 error = mnt_want_write_file(parfilp);
371 if (error)
372 return error;
373
374 dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
375 if (IS_ERR(dentry)) {
376 mnt_drop_write_file(parfilp);
377 return PTR_ERR(dentry);
378 }
379
380 if (IS_IMMUTABLE(d_inode(dentry)) || IS_APPEND(d_inode(dentry))) {
381 error = -EPERM;
382 goto out;
383 }
384
385 if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
386 error = -EFAULT;
387 goto out;
388 }
389
390 error = xfs_set_dmattrs(XFS_I(d_inode(dentry)), fsd.fsd_dmevmask,
391 fsd.fsd_dmstate);
392
393 out:
394 mnt_drop_write_file(parfilp);
395 dput(dentry);
396 return error;
397 }
398
399 STATIC int
xfs_attrlist_by_handle(struct file * parfilp,void __user * arg)400 xfs_attrlist_by_handle(
401 struct file *parfilp,
402 void __user *arg)
403 {
404 int error = -ENOMEM;
405 attrlist_cursor_kern_t *cursor;
406 struct xfs_fsop_attrlist_handlereq __user *p = arg;
407 xfs_fsop_attrlist_handlereq_t al_hreq;
408 struct dentry *dentry;
409 char *kbuf;
410
411 if (!capable(CAP_SYS_ADMIN))
412 return -EPERM;
413 if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
414 return -EFAULT;
415 if (al_hreq.buflen < sizeof(struct attrlist) ||
416 al_hreq.buflen > XFS_XATTR_LIST_MAX)
417 return -EINVAL;
418
419 /*
420 * Reject flags, only allow namespaces.
421 */
422 if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
423 return -EINVAL;
424
425 dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
426 if (IS_ERR(dentry))
427 return PTR_ERR(dentry);
428
429 kbuf = kmem_zalloc_large(al_hreq.buflen, KM_SLEEP);
430 if (!kbuf)
431 goto out_dput;
432
433 cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
434 error = xfs_attr_list(XFS_I(d_inode(dentry)), kbuf, al_hreq.buflen,
435 al_hreq.flags, cursor);
436 if (error)
437 goto out_kfree;
438
439 if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t))) {
440 error = -EFAULT;
441 goto out_kfree;
442 }
443
444 if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
445 error = -EFAULT;
446
447 out_kfree:
448 kmem_free(kbuf);
449 out_dput:
450 dput(dentry);
451 return error;
452 }
453
454 int
xfs_attrmulti_attr_get(struct inode * inode,unsigned char * name,unsigned char __user * ubuf,__uint32_t * len,__uint32_t flags)455 xfs_attrmulti_attr_get(
456 struct inode *inode,
457 unsigned char *name,
458 unsigned char __user *ubuf,
459 __uint32_t *len,
460 __uint32_t flags)
461 {
462 unsigned char *kbuf;
463 int error = -EFAULT;
464
465 if (*len > XFS_XATTR_SIZE_MAX)
466 return -EINVAL;
467 kbuf = kmem_zalloc_large(*len, KM_SLEEP);
468 if (!kbuf)
469 return -ENOMEM;
470
471 error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags);
472 if (error)
473 goto out_kfree;
474
475 if (copy_to_user(ubuf, kbuf, *len))
476 error = -EFAULT;
477
478 out_kfree:
479 kmem_free(kbuf);
480 return error;
481 }
482
483 int
xfs_attrmulti_attr_set(struct inode * inode,unsigned char * name,const unsigned char __user * ubuf,__uint32_t len,__uint32_t flags)484 xfs_attrmulti_attr_set(
485 struct inode *inode,
486 unsigned char *name,
487 const unsigned char __user *ubuf,
488 __uint32_t len,
489 __uint32_t flags)
490 {
491 unsigned char *kbuf;
492 int error;
493
494 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
495 return -EPERM;
496 if (len > XFS_XATTR_SIZE_MAX)
497 return -EINVAL;
498
499 kbuf = memdup_user(ubuf, len);
500 if (IS_ERR(kbuf))
501 return PTR_ERR(kbuf);
502
503 error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);
504 if (!error)
505 xfs_forget_acl(inode, name, flags);
506 kfree(kbuf);
507 return error;
508 }
509
510 int
xfs_attrmulti_attr_remove(struct inode * inode,unsigned char * name,__uint32_t flags)511 xfs_attrmulti_attr_remove(
512 struct inode *inode,
513 unsigned char *name,
514 __uint32_t flags)
515 {
516 int error;
517
518 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
519 return -EPERM;
520 error = xfs_attr_remove(XFS_I(inode), name, flags);
521 if (!error)
522 xfs_forget_acl(inode, name, flags);
523 return error;
524 }
525
526 STATIC int
xfs_attrmulti_by_handle(struct file * parfilp,void __user * arg)527 xfs_attrmulti_by_handle(
528 struct file *parfilp,
529 void __user *arg)
530 {
531 int error;
532 xfs_attr_multiop_t *ops;
533 xfs_fsop_attrmulti_handlereq_t am_hreq;
534 struct dentry *dentry;
535 unsigned int i, size;
536 unsigned char *attr_name;
537
538 if (!capable(CAP_SYS_ADMIN))
539 return -EPERM;
540 if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
541 return -EFAULT;
542
543 /* overflow check */
544 if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
545 return -E2BIG;
546
547 dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
548 if (IS_ERR(dentry))
549 return PTR_ERR(dentry);
550
551 error = -E2BIG;
552 size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
553 if (!size || size > 16 * PAGE_SIZE)
554 goto out_dput;
555
556 ops = memdup_user(am_hreq.ops, size);
557 if (IS_ERR(ops)) {
558 error = PTR_ERR(ops);
559 goto out_dput;
560 }
561
562 error = -ENOMEM;
563 attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
564 if (!attr_name)
565 goto out_kfree_ops;
566
567 error = 0;
568 for (i = 0; i < am_hreq.opcount; i++) {
569 ops[i].am_error = strncpy_from_user((char *)attr_name,
570 ops[i].am_attrname, MAXNAMELEN);
571 if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
572 error = -ERANGE;
573 if (ops[i].am_error < 0)
574 break;
575
576 switch (ops[i].am_opcode) {
577 case ATTR_OP_GET:
578 ops[i].am_error = xfs_attrmulti_attr_get(
579 d_inode(dentry), attr_name,
580 ops[i].am_attrvalue, &ops[i].am_length,
581 ops[i].am_flags);
582 break;
583 case ATTR_OP_SET:
584 ops[i].am_error = mnt_want_write_file(parfilp);
585 if (ops[i].am_error)
586 break;
587 ops[i].am_error = xfs_attrmulti_attr_set(
588 d_inode(dentry), attr_name,
589 ops[i].am_attrvalue, ops[i].am_length,
590 ops[i].am_flags);
591 mnt_drop_write_file(parfilp);
592 break;
593 case ATTR_OP_REMOVE:
594 ops[i].am_error = mnt_want_write_file(parfilp);
595 if (ops[i].am_error)
596 break;
597 ops[i].am_error = xfs_attrmulti_attr_remove(
598 d_inode(dentry), attr_name,
599 ops[i].am_flags);
600 mnt_drop_write_file(parfilp);
601 break;
602 default:
603 ops[i].am_error = -EINVAL;
604 }
605 }
606
607 if (copy_to_user(am_hreq.ops, ops, size))
608 error = -EFAULT;
609
610 kfree(attr_name);
611 out_kfree_ops:
612 kfree(ops);
613 out_dput:
614 dput(dentry);
615 return error;
616 }
617
618 int
xfs_ioc_space(struct xfs_inode * ip,struct inode * inode,struct file * filp,int ioflags,unsigned int cmd,xfs_flock64_t * bf)619 xfs_ioc_space(
620 struct xfs_inode *ip,
621 struct inode *inode,
622 struct file *filp,
623 int ioflags,
624 unsigned int cmd,
625 xfs_flock64_t *bf)
626 {
627 struct iattr iattr;
628 enum xfs_prealloc_flags flags = 0;
629 uint iolock = XFS_IOLOCK_EXCL;
630 int error;
631
632 /*
633 * Only allow the sys admin to reserve space unless
634 * unwritten extents are enabled.
635 */
636 if (!xfs_sb_version_hasextflgbit(&ip->i_mount->m_sb) &&
637 !capable(CAP_SYS_ADMIN))
638 return -EPERM;
639
640 if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
641 return -EPERM;
642
643 if (!(filp->f_mode & FMODE_WRITE))
644 return -EBADF;
645
646 if (!S_ISREG(inode->i_mode))
647 return -EINVAL;
648
649 if (filp->f_flags & O_DSYNC)
650 flags |= XFS_PREALLOC_SYNC;
651 if (ioflags & XFS_IO_INVIS)
652 flags |= XFS_PREALLOC_INVISIBLE;
653
654 error = mnt_want_write_file(filp);
655 if (error)
656 return error;
657
658 xfs_ilock(ip, iolock);
659 error = xfs_break_layouts(inode, &iolock, false);
660 if (error)
661 goto out_unlock;
662
663 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
664 iolock |= XFS_MMAPLOCK_EXCL;
665
666 switch (bf->l_whence) {
667 case 0: /*SEEK_SET*/
668 break;
669 case 1: /*SEEK_CUR*/
670 bf->l_start += filp->f_pos;
671 break;
672 case 2: /*SEEK_END*/
673 bf->l_start += XFS_ISIZE(ip);
674 break;
675 default:
676 error = -EINVAL;
677 goto out_unlock;
678 }
679
680 /*
681 * length of <= 0 for resv/unresv/zero is invalid. length for
682 * alloc/free is ignored completely and we have no idea what userspace
683 * might have set it to, so set it to zero to allow range
684 * checks to pass.
685 */
686 switch (cmd) {
687 case XFS_IOC_ZERO_RANGE:
688 case XFS_IOC_RESVSP:
689 case XFS_IOC_RESVSP64:
690 case XFS_IOC_UNRESVSP:
691 case XFS_IOC_UNRESVSP64:
692 if (bf->l_len <= 0) {
693 error = -EINVAL;
694 goto out_unlock;
695 }
696 break;
697 default:
698 bf->l_len = 0;
699 break;
700 }
701
702 if (bf->l_start < 0 ||
703 bf->l_start > inode->i_sb->s_maxbytes ||
704 bf->l_start + bf->l_len < 0 ||
705 bf->l_start + bf->l_len >= inode->i_sb->s_maxbytes) {
706 error = -EINVAL;
707 goto out_unlock;
708 }
709
710 switch (cmd) {
711 case XFS_IOC_ZERO_RANGE:
712 flags |= XFS_PREALLOC_SET;
713 error = xfs_zero_file_space(ip, bf->l_start, bf->l_len);
714 break;
715 case XFS_IOC_RESVSP:
716 case XFS_IOC_RESVSP64:
717 flags |= XFS_PREALLOC_SET;
718 error = xfs_alloc_file_space(ip, bf->l_start, bf->l_len,
719 XFS_BMAPI_PREALLOC);
720 break;
721 case XFS_IOC_UNRESVSP:
722 case XFS_IOC_UNRESVSP64:
723 error = xfs_free_file_space(ip, bf->l_start, bf->l_len);
724 break;
725 case XFS_IOC_ALLOCSP:
726 case XFS_IOC_ALLOCSP64:
727 case XFS_IOC_FREESP:
728 case XFS_IOC_FREESP64:
729 flags |= XFS_PREALLOC_CLEAR;
730 if (bf->l_start > XFS_ISIZE(ip)) {
731 error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
732 bf->l_start - XFS_ISIZE(ip),
733 XFS_BMAPI_PREALLOC);
734 if (error)
735 goto out_unlock;
736 }
737
738 iattr.ia_valid = ATTR_SIZE;
739 iattr.ia_size = bf->l_start;
740
741 error = xfs_setattr_size(ip, &iattr);
742 break;
743 default:
744 ASSERT(0);
745 error = -EINVAL;
746 }
747
748 if (error)
749 goto out_unlock;
750
751 error = xfs_update_prealloc_flags(ip, flags);
752
753 out_unlock:
754 xfs_iunlock(ip, iolock);
755 mnt_drop_write_file(filp);
756 return error;
757 }
758
759 STATIC int
xfs_ioc_bulkstat(xfs_mount_t * mp,unsigned int cmd,void __user * arg)760 xfs_ioc_bulkstat(
761 xfs_mount_t *mp,
762 unsigned int cmd,
763 void __user *arg)
764 {
765 xfs_fsop_bulkreq_t bulkreq;
766 int count; /* # of records returned */
767 xfs_ino_t inlast; /* last inode number */
768 int done;
769 int error;
770
771 /* done = 1 if there are more stats to get and if bulkstat */
772 /* should be called again (unused here, but used in dmapi) */
773
774 if (!capable(CAP_SYS_ADMIN))
775 return -EPERM;
776
777 if (XFS_FORCED_SHUTDOWN(mp))
778 return -EIO;
779
780 if (copy_from_user(&bulkreq, arg, sizeof(xfs_fsop_bulkreq_t)))
781 return -EFAULT;
782
783 if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
784 return -EFAULT;
785
786 if ((count = bulkreq.icount) <= 0)
787 return -EINVAL;
788
789 if (bulkreq.ubuffer == NULL)
790 return -EINVAL;
791
792 if (cmd == XFS_IOC_FSINUMBERS)
793 error = xfs_inumbers(mp, &inlast, &count,
794 bulkreq.ubuffer, xfs_inumbers_fmt);
795 else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
796 error = xfs_bulkstat_one(mp, inlast, bulkreq.ubuffer,
797 sizeof(xfs_bstat_t), NULL, &done);
798 else /* XFS_IOC_FSBULKSTAT */
799 error = xfs_bulkstat(mp, &inlast, &count, xfs_bulkstat_one,
800 sizeof(xfs_bstat_t), bulkreq.ubuffer,
801 &done);
802
803 if (error)
804 return error;
805
806 if (bulkreq.ocount != NULL) {
807 if (copy_to_user(bulkreq.lastip, &inlast,
808 sizeof(xfs_ino_t)))
809 return -EFAULT;
810
811 if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
812 return -EFAULT;
813 }
814
815 return 0;
816 }
817
818 STATIC int
xfs_ioc_fsgeometry_v1(xfs_mount_t * mp,void __user * arg)819 xfs_ioc_fsgeometry_v1(
820 xfs_mount_t *mp,
821 void __user *arg)
822 {
823 xfs_fsop_geom_t fsgeo;
824 int error;
825
826 error = xfs_fs_geometry(mp, &fsgeo, 3);
827 if (error)
828 return error;
829
830 /*
831 * Caller should have passed an argument of type
832 * xfs_fsop_geom_v1_t. This is a proper subset of the
833 * xfs_fsop_geom_t that xfs_fs_geometry() fills in.
834 */
835 if (copy_to_user(arg, &fsgeo, sizeof(xfs_fsop_geom_v1_t)))
836 return -EFAULT;
837 return 0;
838 }
839
840 STATIC int
xfs_ioc_fsgeometry(xfs_mount_t * mp,void __user * arg)841 xfs_ioc_fsgeometry(
842 xfs_mount_t *mp,
843 void __user *arg)
844 {
845 xfs_fsop_geom_t fsgeo;
846 int error;
847
848 error = xfs_fs_geometry(mp, &fsgeo, 4);
849 if (error)
850 return error;
851
852 if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
853 return -EFAULT;
854 return 0;
855 }
856
857 /*
858 * Linux extended inode flags interface.
859 */
860
861 STATIC unsigned int
xfs_merge_ioc_xflags(unsigned int flags,unsigned int start)862 xfs_merge_ioc_xflags(
863 unsigned int flags,
864 unsigned int start)
865 {
866 unsigned int xflags = start;
867
868 if (flags & FS_IMMUTABLE_FL)
869 xflags |= XFS_XFLAG_IMMUTABLE;
870 else
871 xflags &= ~XFS_XFLAG_IMMUTABLE;
872 if (flags & FS_APPEND_FL)
873 xflags |= XFS_XFLAG_APPEND;
874 else
875 xflags &= ~XFS_XFLAG_APPEND;
876 if (flags & FS_SYNC_FL)
877 xflags |= XFS_XFLAG_SYNC;
878 else
879 xflags &= ~XFS_XFLAG_SYNC;
880 if (flags & FS_NOATIME_FL)
881 xflags |= XFS_XFLAG_NOATIME;
882 else
883 xflags &= ~XFS_XFLAG_NOATIME;
884 if (flags & FS_NODUMP_FL)
885 xflags |= XFS_XFLAG_NODUMP;
886 else
887 xflags &= ~XFS_XFLAG_NODUMP;
888
889 return xflags;
890 }
891
892 STATIC unsigned int
xfs_di2lxflags(__uint16_t di_flags)893 xfs_di2lxflags(
894 __uint16_t di_flags)
895 {
896 unsigned int flags = 0;
897
898 if (di_flags & XFS_DIFLAG_IMMUTABLE)
899 flags |= FS_IMMUTABLE_FL;
900 if (di_flags & XFS_DIFLAG_APPEND)
901 flags |= FS_APPEND_FL;
902 if (di_flags & XFS_DIFLAG_SYNC)
903 flags |= FS_SYNC_FL;
904 if (di_flags & XFS_DIFLAG_NOATIME)
905 flags |= FS_NOATIME_FL;
906 if (di_flags & XFS_DIFLAG_NODUMP)
907 flags |= FS_NODUMP_FL;
908 return flags;
909 }
910
911 STATIC int
xfs_ioc_fsgetxattr(xfs_inode_t * ip,int attr,void __user * arg)912 xfs_ioc_fsgetxattr(
913 xfs_inode_t *ip,
914 int attr,
915 void __user *arg)
916 {
917 struct fsxattr fa;
918
919 memset(&fa, 0, sizeof(struct fsxattr));
920
921 xfs_ilock(ip, XFS_ILOCK_SHARED);
922 fa.fsx_xflags = xfs_ip2xflags(ip);
923 fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
924 fa.fsx_projid = xfs_get_projid(ip);
925
926 if (attr) {
927 if (ip->i_afp) {
928 if (ip->i_afp->if_flags & XFS_IFEXTENTS)
929 fa.fsx_nextents = ip->i_afp->if_bytes /
930 sizeof(xfs_bmbt_rec_t);
931 else
932 fa.fsx_nextents = ip->i_d.di_anextents;
933 } else
934 fa.fsx_nextents = 0;
935 } else {
936 if (ip->i_df.if_flags & XFS_IFEXTENTS)
937 fa.fsx_nextents = ip->i_df.if_bytes /
938 sizeof(xfs_bmbt_rec_t);
939 else
940 fa.fsx_nextents = ip->i_d.di_nextents;
941 }
942 xfs_iunlock(ip, XFS_ILOCK_SHARED);
943
944 if (copy_to_user(arg, &fa, sizeof(fa)))
945 return -EFAULT;
946 return 0;
947 }
948
949 STATIC void
xfs_set_diflags(struct xfs_inode * ip,unsigned int xflags)950 xfs_set_diflags(
951 struct xfs_inode *ip,
952 unsigned int xflags)
953 {
954 unsigned int di_flags;
955
956 /* can't set PREALLOC this way, just preserve it */
957 di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
958 if (xflags & XFS_XFLAG_IMMUTABLE)
959 di_flags |= XFS_DIFLAG_IMMUTABLE;
960 if (xflags & XFS_XFLAG_APPEND)
961 di_flags |= XFS_DIFLAG_APPEND;
962 if (xflags & XFS_XFLAG_SYNC)
963 di_flags |= XFS_DIFLAG_SYNC;
964 if (xflags & XFS_XFLAG_NOATIME)
965 di_flags |= XFS_DIFLAG_NOATIME;
966 if (xflags & XFS_XFLAG_NODUMP)
967 di_flags |= XFS_DIFLAG_NODUMP;
968 if (xflags & XFS_XFLAG_NODEFRAG)
969 di_flags |= XFS_DIFLAG_NODEFRAG;
970 if (xflags & XFS_XFLAG_FILESTREAM)
971 di_flags |= XFS_DIFLAG_FILESTREAM;
972 if (S_ISDIR(ip->i_d.di_mode)) {
973 if (xflags & XFS_XFLAG_RTINHERIT)
974 di_flags |= XFS_DIFLAG_RTINHERIT;
975 if (xflags & XFS_XFLAG_NOSYMLINKS)
976 di_flags |= XFS_DIFLAG_NOSYMLINKS;
977 if (xflags & XFS_XFLAG_EXTSZINHERIT)
978 di_flags |= XFS_DIFLAG_EXTSZINHERIT;
979 if (xflags & XFS_XFLAG_PROJINHERIT)
980 di_flags |= XFS_DIFLAG_PROJINHERIT;
981 } else if (S_ISREG(ip->i_d.di_mode)) {
982 if (xflags & XFS_XFLAG_REALTIME)
983 di_flags |= XFS_DIFLAG_REALTIME;
984 if (xflags & XFS_XFLAG_EXTSIZE)
985 di_flags |= XFS_DIFLAG_EXTSIZE;
986 }
987
988 ip->i_d.di_flags = di_flags;
989 }
990
991 STATIC void
xfs_diflags_to_linux(struct xfs_inode * ip)992 xfs_diflags_to_linux(
993 struct xfs_inode *ip)
994 {
995 struct inode *inode = VFS_I(ip);
996 unsigned int xflags = xfs_ip2xflags(ip);
997
998 if (xflags & XFS_XFLAG_IMMUTABLE)
999 inode->i_flags |= S_IMMUTABLE;
1000 else
1001 inode->i_flags &= ~S_IMMUTABLE;
1002 if (xflags & XFS_XFLAG_APPEND)
1003 inode->i_flags |= S_APPEND;
1004 else
1005 inode->i_flags &= ~S_APPEND;
1006 if (xflags & XFS_XFLAG_SYNC)
1007 inode->i_flags |= S_SYNC;
1008 else
1009 inode->i_flags &= ~S_SYNC;
1010 if (xflags & XFS_XFLAG_NOATIME)
1011 inode->i_flags |= S_NOATIME;
1012 else
1013 inode->i_flags &= ~S_NOATIME;
1014 }
1015
1016 static int
xfs_ioctl_setattr_xflags(struct xfs_trans * tp,struct xfs_inode * ip,struct fsxattr * fa)1017 xfs_ioctl_setattr_xflags(
1018 struct xfs_trans *tp,
1019 struct xfs_inode *ip,
1020 struct fsxattr *fa)
1021 {
1022 struct xfs_mount *mp = ip->i_mount;
1023
1024 /* Can't change realtime flag if any extents are allocated. */
1025 if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
1026 XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & XFS_XFLAG_REALTIME))
1027 return -EINVAL;
1028
1029 /* If realtime flag is set then must have realtime device */
1030 if (fa->fsx_xflags & XFS_XFLAG_REALTIME) {
1031 if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 ||
1032 (ip->i_d.di_extsize % mp->m_sb.sb_rextsize))
1033 return -EINVAL;
1034 }
1035
1036 /*
1037 * Can't modify an immutable/append-only file unless
1038 * we have appropriate permission.
1039 */
1040 if (((ip->i_d.di_flags & (XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND)) ||
1041 (fa->fsx_xflags & (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) &&
1042 !capable(CAP_LINUX_IMMUTABLE))
1043 return -EPERM;
1044
1045 xfs_set_diflags(ip, fa->fsx_xflags);
1046 xfs_diflags_to_linux(ip);
1047 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1048 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1049 XFS_STATS_INC(mp, xs_ig_attrchg);
1050 return 0;
1051 }
1052
1053 /*
1054 * Set up the transaction structure for the setattr operation, checking that we
1055 * have permission to do so. On success, return a clean transaction and the
1056 * inode locked exclusively ready for further operation specific checks. On
1057 * failure, return an error without modifying or locking the inode.
1058 */
1059 static struct xfs_trans *
xfs_ioctl_setattr_get_trans(struct xfs_inode * ip)1060 xfs_ioctl_setattr_get_trans(
1061 struct xfs_inode *ip)
1062 {
1063 struct xfs_mount *mp = ip->i_mount;
1064 struct xfs_trans *tp;
1065 int error;
1066
1067 if (mp->m_flags & XFS_MOUNT_RDONLY)
1068 return ERR_PTR(-EROFS);
1069 if (XFS_FORCED_SHUTDOWN(mp))
1070 return ERR_PTR(-EIO);
1071
1072 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
1073 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
1074 if (error)
1075 goto out_cancel;
1076
1077 xfs_ilock(ip, XFS_ILOCK_EXCL);
1078 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1079
1080 /*
1081 * CAP_FOWNER overrides the following restrictions:
1082 *
1083 * The user ID of the calling process must be equal to the file owner
1084 * ID, except in cases where the CAP_FSETID capability is applicable.
1085 */
1086 if (!inode_owner_or_capable(VFS_I(ip))) {
1087 error = -EPERM;
1088 goto out_cancel;
1089 }
1090
1091 if (mp->m_flags & XFS_MOUNT_WSYNC)
1092 xfs_trans_set_sync(tp);
1093
1094 return tp;
1095
1096 out_cancel:
1097 xfs_trans_cancel(tp);
1098 return ERR_PTR(error);
1099 }
1100
1101 /*
1102 * extent size hint validation is somewhat cumbersome. Rules are:
1103 *
1104 * 1. extent size hint is only valid for directories and regular files
1105 * 2. XFS_XFLAG_EXTSIZE is only valid for regular files
1106 * 3. XFS_XFLAG_EXTSZINHERIT is only valid for directories.
1107 * 4. can only be changed on regular files if no extents are allocated
1108 * 5. can be changed on directories at any time
1109 * 6. extsize hint of 0 turns off hints, clears inode flags.
1110 * 7. Extent size must be a multiple of the appropriate block size.
1111 * 8. for non-realtime files, the extent size hint must be limited
1112 * to half the AG size to avoid alignment extending the extent beyond the
1113 * limits of the AG.
1114 */
1115 static int
xfs_ioctl_setattr_check_extsize(struct xfs_inode * ip,struct fsxattr * fa)1116 xfs_ioctl_setattr_check_extsize(
1117 struct xfs_inode *ip,
1118 struct fsxattr *fa)
1119 {
1120 struct xfs_mount *mp = ip->i_mount;
1121
1122 if ((fa->fsx_xflags & XFS_XFLAG_EXTSIZE) && !S_ISREG(ip->i_d.di_mode))
1123 return -EINVAL;
1124
1125 if ((fa->fsx_xflags & XFS_XFLAG_EXTSZINHERIT) &&
1126 !S_ISDIR(ip->i_d.di_mode))
1127 return -EINVAL;
1128
1129 if (S_ISREG(ip->i_d.di_mode) && ip->i_d.di_nextents &&
1130 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize))
1131 return -EINVAL;
1132
1133 if (fa->fsx_extsize != 0) {
1134 xfs_extlen_t size;
1135 xfs_fsblock_t extsize_fsb;
1136
1137 extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize);
1138 if (extsize_fsb > MAXEXTLEN)
1139 return -EINVAL;
1140
1141 if (XFS_IS_REALTIME_INODE(ip) ||
1142 (fa->fsx_xflags & XFS_XFLAG_REALTIME)) {
1143 size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
1144 } else {
1145 size = mp->m_sb.sb_blocksize;
1146 if (extsize_fsb > mp->m_sb.sb_agblocks / 2)
1147 return -EINVAL;
1148 }
1149
1150 if (fa->fsx_extsize % size)
1151 return -EINVAL;
1152 } else
1153 fa->fsx_xflags &= ~(XFS_XFLAG_EXTSIZE | XFS_XFLAG_EXTSZINHERIT);
1154
1155 return 0;
1156 }
1157
1158 static int
xfs_ioctl_setattr_check_projid(struct xfs_inode * ip,struct fsxattr * fa)1159 xfs_ioctl_setattr_check_projid(
1160 struct xfs_inode *ip,
1161 struct fsxattr *fa)
1162 {
1163 /* Disallow 32bit project ids if projid32bit feature is not enabled. */
1164 if (fa->fsx_projid > (__uint16_t)-1 &&
1165 !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
1166 return -EINVAL;
1167
1168 /*
1169 * Project Quota ID state is only allowed to change from within the init
1170 * namespace. Enforce that restriction only if we are trying to change
1171 * the quota ID state. Everything else is allowed in user namespaces.
1172 */
1173 if (current_user_ns() == &init_user_ns)
1174 return 0;
1175
1176 if (xfs_get_projid(ip) != fa->fsx_projid)
1177 return -EINVAL;
1178 if ((fa->fsx_xflags & XFS_XFLAG_PROJINHERIT) !=
1179 (ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
1180 return -EINVAL;
1181
1182 return 0;
1183 }
1184
1185 STATIC int
xfs_ioctl_setattr(xfs_inode_t * ip,struct fsxattr * fa)1186 xfs_ioctl_setattr(
1187 xfs_inode_t *ip,
1188 struct fsxattr *fa)
1189 {
1190 struct xfs_mount *mp = ip->i_mount;
1191 struct xfs_trans *tp;
1192 struct xfs_dquot *udqp = NULL;
1193 struct xfs_dquot *pdqp = NULL;
1194 struct xfs_dquot *olddquot = NULL;
1195 int code;
1196
1197 trace_xfs_ioctl_setattr(ip);
1198
1199 code = xfs_ioctl_setattr_check_projid(ip, fa);
1200 if (code)
1201 return code;
1202
1203 /*
1204 * If disk quotas is on, we make sure that the dquots do exist on disk,
1205 * before we start any other transactions. Trying to do this later
1206 * is messy. We don't care to take a readlock to look at the ids
1207 * in inode here, because we can't hold it across the trans_reserve.
1208 * If the IDs do change before we take the ilock, we're covered
1209 * because the i_*dquot fields will get updated anyway.
1210 */
1211 if (XFS_IS_QUOTA_ON(mp)) {
1212 code = xfs_qm_vop_dqalloc(ip, ip->i_d.di_uid,
1213 ip->i_d.di_gid, fa->fsx_projid,
1214 XFS_QMOPT_PQUOTA, &udqp, NULL, &pdqp);
1215 if (code)
1216 return code;
1217 }
1218
1219 tp = xfs_ioctl_setattr_get_trans(ip);
1220 if (IS_ERR(tp)) {
1221 code = PTR_ERR(tp);
1222 goto error_free_dquots;
1223 }
1224
1225
1226 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) &&
1227 xfs_get_projid(ip) != fa->fsx_projid) {
1228 code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, pdqp,
1229 capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0);
1230 if (code) /* out of quota */
1231 goto error_trans_cancel;
1232 }
1233
1234 code = xfs_ioctl_setattr_check_extsize(ip, fa);
1235 if (code)
1236 goto error_trans_cancel;
1237
1238 code = xfs_ioctl_setattr_xflags(tp, ip, fa);
1239 if (code)
1240 goto error_trans_cancel;
1241
1242 /*
1243 * Change file ownership. Must be the owner or privileged. CAP_FSETID
1244 * overrides the following restrictions:
1245 *
1246 * The set-user-ID and set-group-ID bits of a file will be cleared upon
1247 * successful return from chown()
1248 */
1249
1250 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
1251 !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID))
1252 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
1253
1254 /* Change the ownerships and register project quota modifications */
1255 if (xfs_get_projid(ip) != fa->fsx_projid) {
1256 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) {
1257 olddquot = xfs_qm_vop_chown(tp, ip,
1258 &ip->i_pdquot, pdqp);
1259 }
1260 ASSERT(ip->i_d.di_version > 1);
1261 xfs_set_projid(ip, fa->fsx_projid);
1262 }
1263
1264 /*
1265 * Only set the extent size hint if we've already determined that the
1266 * extent size hint should be set on the inode. If no extent size flags
1267 * are set on the inode then unconditionally clear the extent size hint.
1268 */
1269 if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT))
1270 ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
1271 else
1272 ip->i_d.di_extsize = 0;
1273
1274 code = xfs_trans_commit(tp);
1275
1276 /*
1277 * Release any dquot(s) the inode had kept before chown.
1278 */
1279 xfs_qm_dqrele(olddquot);
1280 xfs_qm_dqrele(udqp);
1281 xfs_qm_dqrele(pdqp);
1282
1283 return code;
1284
1285 error_trans_cancel:
1286 xfs_trans_cancel(tp);
1287 error_free_dquots:
1288 xfs_qm_dqrele(udqp);
1289 xfs_qm_dqrele(pdqp);
1290 return code;
1291 }
1292
1293 STATIC int
xfs_ioc_fssetxattr(xfs_inode_t * ip,struct file * filp,void __user * arg)1294 xfs_ioc_fssetxattr(
1295 xfs_inode_t *ip,
1296 struct file *filp,
1297 void __user *arg)
1298 {
1299 struct fsxattr fa;
1300 int error;
1301
1302 if (copy_from_user(&fa, arg, sizeof(fa)))
1303 return -EFAULT;
1304
1305 error = mnt_want_write_file(filp);
1306 if (error)
1307 return error;
1308 error = xfs_ioctl_setattr(ip, &fa);
1309 mnt_drop_write_file(filp);
1310 return error;
1311 }
1312
1313 STATIC int
xfs_ioc_getxflags(xfs_inode_t * ip,void __user * arg)1314 xfs_ioc_getxflags(
1315 xfs_inode_t *ip,
1316 void __user *arg)
1317 {
1318 unsigned int flags;
1319
1320 flags = xfs_di2lxflags(ip->i_d.di_flags);
1321 if (copy_to_user(arg, &flags, sizeof(flags)))
1322 return -EFAULT;
1323 return 0;
1324 }
1325
1326 STATIC int
xfs_ioc_setxflags(struct xfs_inode * ip,struct file * filp,void __user * arg)1327 xfs_ioc_setxflags(
1328 struct xfs_inode *ip,
1329 struct file *filp,
1330 void __user *arg)
1331 {
1332 struct xfs_trans *tp;
1333 struct fsxattr fa;
1334 unsigned int flags;
1335 int error;
1336
1337 if (copy_from_user(&flags, arg, sizeof(flags)))
1338 return -EFAULT;
1339
1340 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
1341 FS_NOATIME_FL | FS_NODUMP_FL | \
1342 FS_SYNC_FL))
1343 return -EOPNOTSUPP;
1344
1345 fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
1346
1347 error = mnt_want_write_file(filp);
1348 if (error)
1349 return error;
1350
1351 tp = xfs_ioctl_setattr_get_trans(ip);
1352 if (IS_ERR(tp)) {
1353 error = PTR_ERR(tp);
1354 goto out_drop_write;
1355 }
1356
1357 error = xfs_ioctl_setattr_xflags(tp, ip, &fa);
1358 if (error) {
1359 xfs_trans_cancel(tp);
1360 goto out_drop_write;
1361 }
1362
1363 error = xfs_trans_commit(tp);
1364 out_drop_write:
1365 mnt_drop_write_file(filp);
1366 return error;
1367 }
1368
1369 STATIC int
xfs_getbmap_format(void ** ap,struct getbmapx * bmv,int * full)1370 xfs_getbmap_format(void **ap, struct getbmapx *bmv, int *full)
1371 {
1372 struct getbmap __user *base = (struct getbmap __user *)*ap;
1373
1374 /* copy only getbmap portion (not getbmapx) */
1375 if (copy_to_user(base, bmv, sizeof(struct getbmap)))
1376 return -EFAULT;
1377
1378 *ap += sizeof(struct getbmap);
1379 return 0;
1380 }
1381
1382 STATIC int
xfs_ioc_getbmap(struct xfs_inode * ip,int ioflags,unsigned int cmd,void __user * arg)1383 xfs_ioc_getbmap(
1384 struct xfs_inode *ip,
1385 int ioflags,
1386 unsigned int cmd,
1387 void __user *arg)
1388 {
1389 struct getbmapx bmx = { 0 };
1390 int error;
1391
1392 /* struct getbmap is a strict subset of struct getbmapx. */
1393 if (copy_from_user(&bmx, arg, offsetof(struct getbmapx, bmv_iflags)))
1394 return -EFAULT;
1395
1396 if (bmx.bmv_count < 2)
1397 return -EINVAL;
1398
1399 bmx.bmv_iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
1400 if (ioflags & XFS_IO_INVIS)
1401 bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
1402
1403 error = xfs_getbmap(ip, &bmx, xfs_getbmap_format,
1404 (__force struct getbmap *)arg+1);
1405 if (error)
1406 return error;
1407
1408 /* copy back header - only size of getbmap */
1409 if (copy_to_user(arg, &bmx, sizeof(struct getbmap)))
1410 return -EFAULT;
1411 return 0;
1412 }
1413
1414 STATIC int
xfs_getbmapx_format(void ** ap,struct getbmapx * bmv,int * full)1415 xfs_getbmapx_format(void **ap, struct getbmapx *bmv, int *full)
1416 {
1417 struct getbmapx __user *base = (struct getbmapx __user *)*ap;
1418
1419 if (copy_to_user(base, bmv, sizeof(struct getbmapx)))
1420 return -EFAULT;
1421
1422 *ap += sizeof(struct getbmapx);
1423 return 0;
1424 }
1425
1426 STATIC int
xfs_ioc_getbmapx(struct xfs_inode * ip,void __user * arg)1427 xfs_ioc_getbmapx(
1428 struct xfs_inode *ip,
1429 void __user *arg)
1430 {
1431 struct getbmapx bmx;
1432 int error;
1433
1434 if (copy_from_user(&bmx, arg, sizeof(bmx)))
1435 return -EFAULT;
1436
1437 if (bmx.bmv_count < 2)
1438 return -EINVAL;
1439
1440 if (bmx.bmv_iflags & (~BMV_IF_VALID))
1441 return -EINVAL;
1442
1443 error = xfs_getbmap(ip, &bmx, xfs_getbmapx_format,
1444 (__force struct getbmapx *)arg+1);
1445 if (error)
1446 return error;
1447
1448 /* copy back header */
1449 if (copy_to_user(arg, &bmx, sizeof(struct getbmapx)))
1450 return -EFAULT;
1451
1452 return 0;
1453 }
1454
1455 int
xfs_ioc_swapext(xfs_swapext_t * sxp)1456 xfs_ioc_swapext(
1457 xfs_swapext_t *sxp)
1458 {
1459 xfs_inode_t *ip, *tip;
1460 struct fd f, tmp;
1461 int error = 0;
1462
1463 /* Pull information for the target fd */
1464 f = fdget((int)sxp->sx_fdtarget);
1465 if (!f.file) {
1466 error = -EINVAL;
1467 goto out;
1468 }
1469
1470 if (!(f.file->f_mode & FMODE_WRITE) ||
1471 !(f.file->f_mode & FMODE_READ) ||
1472 (f.file->f_flags & O_APPEND)) {
1473 error = -EBADF;
1474 goto out_put_file;
1475 }
1476
1477 tmp = fdget((int)sxp->sx_fdtmp);
1478 if (!tmp.file) {
1479 error = -EINVAL;
1480 goto out_put_file;
1481 }
1482
1483 if (!(tmp.file->f_mode & FMODE_WRITE) ||
1484 !(tmp.file->f_mode & FMODE_READ) ||
1485 (tmp.file->f_flags & O_APPEND)) {
1486 error = -EBADF;
1487 goto out_put_tmp_file;
1488 }
1489
1490 if (IS_SWAPFILE(file_inode(f.file)) ||
1491 IS_SWAPFILE(file_inode(tmp.file))) {
1492 error = -EINVAL;
1493 goto out_put_tmp_file;
1494 }
1495
1496 ip = XFS_I(file_inode(f.file));
1497 tip = XFS_I(file_inode(tmp.file));
1498
1499 if (ip->i_mount != tip->i_mount) {
1500 error = -EINVAL;
1501 goto out_put_tmp_file;
1502 }
1503
1504 if (ip->i_ino == tip->i_ino) {
1505 error = -EINVAL;
1506 goto out_put_tmp_file;
1507 }
1508
1509 if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
1510 error = -EIO;
1511 goto out_put_tmp_file;
1512 }
1513
1514 error = xfs_swap_extents(ip, tip, sxp);
1515
1516 out_put_tmp_file:
1517 fdput(tmp);
1518 out_put_file:
1519 fdput(f);
1520 out:
1521 return error;
1522 }
1523
1524 /*
1525 * Note: some of the ioctl's return positive numbers as a
1526 * byte count indicating success, such as readlink_by_handle.
1527 * So we don't "sign flip" like most other routines. This means
1528 * true errors need to be returned as a negative value.
1529 */
1530 long
xfs_file_ioctl(struct file * filp,unsigned int cmd,unsigned long p)1531 xfs_file_ioctl(
1532 struct file *filp,
1533 unsigned int cmd,
1534 unsigned long p)
1535 {
1536 struct inode *inode = file_inode(filp);
1537 struct xfs_inode *ip = XFS_I(inode);
1538 struct xfs_mount *mp = ip->i_mount;
1539 void __user *arg = (void __user *)p;
1540 int ioflags = 0;
1541 int error;
1542
1543 if (filp->f_mode & FMODE_NOCMTIME)
1544 ioflags |= XFS_IO_INVIS;
1545
1546 trace_xfs_file_ioctl(ip);
1547
1548 switch (cmd) {
1549 case FITRIM:
1550 return xfs_ioc_trim(mp, arg);
1551 case XFS_IOC_ALLOCSP:
1552 case XFS_IOC_FREESP:
1553 case XFS_IOC_RESVSP:
1554 case XFS_IOC_UNRESVSP:
1555 case XFS_IOC_ALLOCSP64:
1556 case XFS_IOC_FREESP64:
1557 case XFS_IOC_RESVSP64:
1558 case XFS_IOC_UNRESVSP64:
1559 case XFS_IOC_ZERO_RANGE: {
1560 xfs_flock64_t bf;
1561
1562 if (copy_from_user(&bf, arg, sizeof(bf)))
1563 return -EFAULT;
1564 return xfs_ioc_space(ip, inode, filp, ioflags, cmd, &bf);
1565 }
1566 case XFS_IOC_DIOINFO: {
1567 struct dioattr da;
1568 xfs_buftarg_t *target =
1569 XFS_IS_REALTIME_INODE(ip) ?
1570 mp->m_rtdev_targp : mp->m_ddev_targp;
1571
1572 da.d_mem = da.d_miniosz = target->bt_logical_sectorsize;
1573 da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
1574
1575 if (copy_to_user(arg, &da, sizeof(da)))
1576 return -EFAULT;
1577 return 0;
1578 }
1579
1580 case XFS_IOC_FSBULKSTAT_SINGLE:
1581 case XFS_IOC_FSBULKSTAT:
1582 case XFS_IOC_FSINUMBERS:
1583 return xfs_ioc_bulkstat(mp, cmd, arg);
1584
1585 case XFS_IOC_FSGEOMETRY_V1:
1586 return xfs_ioc_fsgeometry_v1(mp, arg);
1587
1588 case XFS_IOC_FSGEOMETRY:
1589 return xfs_ioc_fsgeometry(mp, arg);
1590
1591 case XFS_IOC_GETVERSION:
1592 return put_user(inode->i_generation, (int __user *)arg);
1593
1594 case XFS_IOC_FSGETXATTR:
1595 return xfs_ioc_fsgetxattr(ip, 0, arg);
1596 case XFS_IOC_FSGETXATTRA:
1597 return xfs_ioc_fsgetxattr(ip, 1, arg);
1598 case XFS_IOC_FSSETXATTR:
1599 return xfs_ioc_fssetxattr(ip, filp, arg);
1600 case XFS_IOC_GETXFLAGS:
1601 return xfs_ioc_getxflags(ip, arg);
1602 case XFS_IOC_SETXFLAGS:
1603 return xfs_ioc_setxflags(ip, filp, arg);
1604
1605 case XFS_IOC_FSSETDM: {
1606 struct fsdmidata dmi;
1607
1608 if (copy_from_user(&dmi, arg, sizeof(dmi)))
1609 return -EFAULT;
1610
1611 error = mnt_want_write_file(filp);
1612 if (error)
1613 return error;
1614
1615 error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
1616 dmi.fsd_dmstate);
1617 mnt_drop_write_file(filp);
1618 return error;
1619 }
1620
1621 case XFS_IOC_GETBMAP:
1622 case XFS_IOC_GETBMAPA:
1623 return xfs_ioc_getbmap(ip, ioflags, cmd, arg);
1624
1625 case XFS_IOC_GETBMAPX:
1626 return xfs_ioc_getbmapx(ip, arg);
1627
1628 case XFS_IOC_FD_TO_HANDLE:
1629 case XFS_IOC_PATH_TO_HANDLE:
1630 case XFS_IOC_PATH_TO_FSHANDLE: {
1631 xfs_fsop_handlereq_t hreq;
1632
1633 if (copy_from_user(&hreq, arg, sizeof(hreq)))
1634 return -EFAULT;
1635 return xfs_find_handle(cmd, &hreq);
1636 }
1637 case XFS_IOC_OPEN_BY_HANDLE: {
1638 xfs_fsop_handlereq_t hreq;
1639
1640 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1641 return -EFAULT;
1642 return xfs_open_by_handle(filp, &hreq);
1643 }
1644 case XFS_IOC_FSSETDM_BY_HANDLE:
1645 return xfs_fssetdm_by_handle(filp, arg);
1646
1647 case XFS_IOC_READLINK_BY_HANDLE: {
1648 xfs_fsop_handlereq_t hreq;
1649
1650 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1651 return -EFAULT;
1652 return xfs_readlink_by_handle(filp, &hreq);
1653 }
1654 case XFS_IOC_ATTRLIST_BY_HANDLE:
1655 return xfs_attrlist_by_handle(filp, arg);
1656
1657 case XFS_IOC_ATTRMULTI_BY_HANDLE:
1658 return xfs_attrmulti_by_handle(filp, arg);
1659
1660 case XFS_IOC_SWAPEXT: {
1661 struct xfs_swapext sxp;
1662
1663 if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
1664 return -EFAULT;
1665 error = mnt_want_write_file(filp);
1666 if (error)
1667 return error;
1668 error = xfs_ioc_swapext(&sxp);
1669 mnt_drop_write_file(filp);
1670 return error;
1671 }
1672
1673 case XFS_IOC_FSCOUNTS: {
1674 xfs_fsop_counts_t out;
1675
1676 error = xfs_fs_counts(mp, &out);
1677 if (error)
1678 return error;
1679
1680 if (copy_to_user(arg, &out, sizeof(out)))
1681 return -EFAULT;
1682 return 0;
1683 }
1684
1685 case XFS_IOC_SET_RESBLKS: {
1686 xfs_fsop_resblks_t inout;
1687 __uint64_t in;
1688
1689 if (!capable(CAP_SYS_ADMIN))
1690 return -EPERM;
1691
1692 if (mp->m_flags & XFS_MOUNT_RDONLY)
1693 return -EROFS;
1694
1695 if (copy_from_user(&inout, arg, sizeof(inout)))
1696 return -EFAULT;
1697
1698 error = mnt_want_write_file(filp);
1699 if (error)
1700 return error;
1701
1702 /* input parameter is passed in resblks field of structure */
1703 in = inout.resblks;
1704 error = xfs_reserve_blocks(mp, &in, &inout);
1705 mnt_drop_write_file(filp);
1706 if (error)
1707 return error;
1708
1709 if (copy_to_user(arg, &inout, sizeof(inout)))
1710 return -EFAULT;
1711 return 0;
1712 }
1713
1714 case XFS_IOC_GET_RESBLKS: {
1715 xfs_fsop_resblks_t out;
1716
1717 if (!capable(CAP_SYS_ADMIN))
1718 return -EPERM;
1719
1720 error = xfs_reserve_blocks(mp, NULL, &out);
1721 if (error)
1722 return error;
1723
1724 if (copy_to_user(arg, &out, sizeof(out)))
1725 return -EFAULT;
1726
1727 return 0;
1728 }
1729
1730 case XFS_IOC_FSGROWFSDATA: {
1731 xfs_growfs_data_t in;
1732
1733 if (copy_from_user(&in, arg, sizeof(in)))
1734 return -EFAULT;
1735
1736 error = mnt_want_write_file(filp);
1737 if (error)
1738 return error;
1739 error = xfs_growfs_data(mp, &in);
1740 mnt_drop_write_file(filp);
1741 return error;
1742 }
1743
1744 case XFS_IOC_FSGROWFSLOG: {
1745 xfs_growfs_log_t in;
1746
1747 if (copy_from_user(&in, arg, sizeof(in)))
1748 return -EFAULT;
1749
1750 error = mnt_want_write_file(filp);
1751 if (error)
1752 return error;
1753 error = xfs_growfs_log(mp, &in);
1754 mnt_drop_write_file(filp);
1755 return error;
1756 }
1757
1758 case XFS_IOC_FSGROWFSRT: {
1759 xfs_growfs_rt_t in;
1760
1761 if (copy_from_user(&in, arg, sizeof(in)))
1762 return -EFAULT;
1763
1764 error = mnt_want_write_file(filp);
1765 if (error)
1766 return error;
1767 error = xfs_growfs_rt(mp, &in);
1768 mnt_drop_write_file(filp);
1769 return error;
1770 }
1771
1772 case XFS_IOC_GOINGDOWN: {
1773 __uint32_t in;
1774
1775 if (!capable(CAP_SYS_ADMIN))
1776 return -EPERM;
1777
1778 if (get_user(in, (__uint32_t __user *)arg))
1779 return -EFAULT;
1780
1781 return xfs_fs_goingdown(mp, in);
1782 }
1783
1784 case XFS_IOC_ERROR_INJECTION: {
1785 xfs_error_injection_t in;
1786
1787 if (!capable(CAP_SYS_ADMIN))
1788 return -EPERM;
1789
1790 if (copy_from_user(&in, arg, sizeof(in)))
1791 return -EFAULT;
1792
1793 return xfs_errortag_add(in.errtag, mp);
1794 }
1795
1796 case XFS_IOC_ERROR_CLEARALL:
1797 if (!capable(CAP_SYS_ADMIN))
1798 return -EPERM;
1799
1800 return xfs_errortag_clearall(mp, 1);
1801
1802 case XFS_IOC_FREE_EOFBLOCKS: {
1803 struct xfs_fs_eofblocks eofb;
1804 struct xfs_eofblocks keofb;
1805
1806 if (!capable(CAP_SYS_ADMIN))
1807 return -EPERM;
1808
1809 if (mp->m_flags & XFS_MOUNT_RDONLY)
1810 return -EROFS;
1811
1812 if (copy_from_user(&eofb, arg, sizeof(eofb)))
1813 return -EFAULT;
1814
1815 error = xfs_fs_eofblocks_from_user(&eofb, &keofb);
1816 if (error)
1817 return error;
1818
1819 return xfs_icache_free_eofblocks(mp, &keofb);
1820 }
1821
1822 default:
1823 return -ENOTTY;
1824 }
1825 }
1826