1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_mount.h"
13 #include "xfs_inode.h"
14 #include "xfs_rtalloc.h"
15 #include "xfs_iwalk.h"
16 #include "xfs_itable.h"
17 #include "xfs_error.h"
18 #include "xfs_attr.h"
19 #include "xfs_bmap.h"
20 #include "xfs_bmap_util.h"
21 #include "xfs_fsops.h"
22 #include "xfs_discard.h"
23 #include "xfs_quota.h"
24 #include "xfs_export.h"
25 #include "xfs_trace.h"
26 #include "xfs_icache.h"
27 #include "xfs_trans.h"
28 #include "xfs_acl.h"
29 #include "xfs_btree.h"
30 #include <linux/fsmap.h>
31 #include "xfs_fsmap.h"
32 #include "scrub/xfs_scrub.h"
33 #include "xfs_sb.h"
34 #include "xfs_ag.h"
35 #include "xfs_health.h"
36
37 #include <linux/mount.h>
38 #include <linux/namei.h>
39
40 /*
41 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
42 * a file or fs handle.
43 *
44 * XFS_IOC_PATH_TO_FSHANDLE
45 * returns fs handle for a mount point or path within that mount point
46 * XFS_IOC_FD_TO_HANDLE
47 * returns full handle for a FD opened in user space
48 * XFS_IOC_PATH_TO_HANDLE
49 * returns full handle for a path
50 */
51 int
xfs_find_handle(unsigned int cmd,xfs_fsop_handlereq_t * hreq)52 xfs_find_handle(
53 unsigned int cmd,
54 xfs_fsop_handlereq_t *hreq)
55 {
56 int hsize;
57 xfs_handle_t handle;
58 struct inode *inode;
59 struct fd f = {NULL};
60 struct path path;
61 int error;
62 struct xfs_inode *ip;
63
64 if (cmd == XFS_IOC_FD_TO_HANDLE) {
65 f = fdget(hreq->fd);
66 if (!f.file)
67 return -EBADF;
68 inode = file_inode(f.file);
69 } else {
70 error = user_path_at(AT_FDCWD, hreq->path, 0, &path);
71 if (error)
72 return error;
73 inode = d_inode(path.dentry);
74 }
75 ip = XFS_I(inode);
76
77 /*
78 * We can only generate handles for inodes residing on a XFS filesystem,
79 * and only for regular files, directories or symbolic links.
80 */
81 error = -EINVAL;
82 if (inode->i_sb->s_magic != XFS_SB_MAGIC)
83 goto out_put;
84
85 error = -EBADF;
86 if (!S_ISREG(inode->i_mode) &&
87 !S_ISDIR(inode->i_mode) &&
88 !S_ISLNK(inode->i_mode))
89 goto out_put;
90
91
92 memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));
93
94 if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
95 /*
96 * This handle only contains an fsid, zero the rest.
97 */
98 memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
99 hsize = sizeof(xfs_fsid_t);
100 } else {
101 handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
102 sizeof(handle.ha_fid.fid_len);
103 handle.ha_fid.fid_pad = 0;
104 handle.ha_fid.fid_gen = inode->i_generation;
105 handle.ha_fid.fid_ino = ip->i_ino;
106 hsize = sizeof(xfs_handle_t);
107 }
108
109 error = -EFAULT;
110 if (copy_to_user(hreq->ohandle, &handle, hsize) ||
111 copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
112 goto out_put;
113
114 error = 0;
115
116 out_put:
117 if (cmd == XFS_IOC_FD_TO_HANDLE)
118 fdput(f);
119 else
120 path_put(&path);
121 return error;
122 }
123
124 /*
125 * No need to do permission checks on the various pathname components
126 * as the handle operations are privileged.
127 */
128 STATIC int
xfs_handle_acceptable(void * context,struct dentry * dentry)129 xfs_handle_acceptable(
130 void *context,
131 struct dentry *dentry)
132 {
133 return 1;
134 }
135
136 /*
137 * Convert userspace handle data into a dentry.
138 */
139 struct dentry *
xfs_handle_to_dentry(struct file * parfilp,void __user * uhandle,u32 hlen)140 xfs_handle_to_dentry(
141 struct file *parfilp,
142 void __user *uhandle,
143 u32 hlen)
144 {
145 xfs_handle_t handle;
146 struct xfs_fid64 fid;
147
148 /*
149 * Only allow handle opens under a directory.
150 */
151 if (!S_ISDIR(file_inode(parfilp)->i_mode))
152 return ERR_PTR(-ENOTDIR);
153
154 if (hlen != sizeof(xfs_handle_t))
155 return ERR_PTR(-EINVAL);
156 if (copy_from_user(&handle, uhandle, hlen))
157 return ERR_PTR(-EFAULT);
158 if (handle.ha_fid.fid_len !=
159 sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
160 return ERR_PTR(-EINVAL);
161
162 memset(&fid, 0, sizeof(struct fid));
163 fid.ino = handle.ha_fid.fid_ino;
164 fid.gen = handle.ha_fid.fid_gen;
165
166 return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
167 FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
168 xfs_handle_acceptable, NULL);
169 }
170
171 STATIC struct dentry *
xfs_handlereq_to_dentry(struct file * parfilp,xfs_fsop_handlereq_t * hreq)172 xfs_handlereq_to_dentry(
173 struct file *parfilp,
174 xfs_fsop_handlereq_t *hreq)
175 {
176 return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
177 }
178
179 int
xfs_open_by_handle(struct file * parfilp,xfs_fsop_handlereq_t * hreq)180 xfs_open_by_handle(
181 struct file *parfilp,
182 xfs_fsop_handlereq_t *hreq)
183 {
184 const struct cred *cred = current_cred();
185 int error;
186 int fd;
187 int permflag;
188 struct file *filp;
189 struct inode *inode;
190 struct dentry *dentry;
191 fmode_t fmode;
192 struct path path;
193
194 if (!capable(CAP_SYS_ADMIN))
195 return -EPERM;
196
197 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
198 if (IS_ERR(dentry))
199 return PTR_ERR(dentry);
200 inode = d_inode(dentry);
201
202 /* Restrict xfs_open_by_handle to directories & regular files. */
203 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
204 error = -EPERM;
205 goto out_dput;
206 }
207
208 #if BITS_PER_LONG != 32
209 hreq->oflags |= O_LARGEFILE;
210 #endif
211
212 permflag = hreq->oflags;
213 fmode = OPEN_FMODE(permflag);
214 if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
215 (fmode & FMODE_WRITE) && IS_APPEND(inode)) {
216 error = -EPERM;
217 goto out_dput;
218 }
219
220 if ((fmode & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
221 error = -EPERM;
222 goto out_dput;
223 }
224
225 /* Can't write directories. */
226 if (S_ISDIR(inode->i_mode) && (fmode & FMODE_WRITE)) {
227 error = -EISDIR;
228 goto out_dput;
229 }
230
231 fd = get_unused_fd_flags(0);
232 if (fd < 0) {
233 error = fd;
234 goto out_dput;
235 }
236
237 path.mnt = parfilp->f_path.mnt;
238 path.dentry = dentry;
239 filp = dentry_open(&path, hreq->oflags, cred);
240 dput(dentry);
241 if (IS_ERR(filp)) {
242 put_unused_fd(fd);
243 return PTR_ERR(filp);
244 }
245
246 if (S_ISREG(inode->i_mode)) {
247 filp->f_flags |= O_NOATIME;
248 filp->f_mode |= FMODE_NOCMTIME;
249 }
250
251 fd_install(fd, filp);
252 return fd;
253
254 out_dput:
255 dput(dentry);
256 return error;
257 }
258
259 int
xfs_readlink_by_handle(struct file * parfilp,xfs_fsop_handlereq_t * hreq)260 xfs_readlink_by_handle(
261 struct file *parfilp,
262 xfs_fsop_handlereq_t *hreq)
263 {
264 struct dentry *dentry;
265 __u32 olen;
266 int error;
267
268 if (!capable(CAP_SYS_ADMIN))
269 return -EPERM;
270
271 dentry = xfs_handlereq_to_dentry(parfilp, hreq);
272 if (IS_ERR(dentry))
273 return PTR_ERR(dentry);
274
275 /* Restrict this handle operation to symlinks only. */
276 if (!d_is_symlink(dentry)) {
277 error = -EINVAL;
278 goto out_dput;
279 }
280
281 if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
282 error = -EFAULT;
283 goto out_dput;
284 }
285
286 error = vfs_readlink(dentry, hreq->ohandle, olen);
287
288 out_dput:
289 dput(dentry);
290 return error;
291 }
292
293 int
xfs_set_dmattrs(xfs_inode_t * ip,uint evmask,uint16_t state)294 xfs_set_dmattrs(
295 xfs_inode_t *ip,
296 uint evmask,
297 uint16_t state)
298 {
299 xfs_mount_t *mp = ip->i_mount;
300 xfs_trans_t *tp;
301 int error;
302
303 if (!capable(CAP_SYS_ADMIN))
304 return -EPERM;
305
306 if (XFS_FORCED_SHUTDOWN(mp))
307 return -EIO;
308
309 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
310 if (error)
311 return error;
312
313 xfs_ilock(ip, XFS_ILOCK_EXCL);
314 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
315
316 ip->i_d.di_dmevmask = evmask;
317 ip->i_d.di_dmstate = state;
318
319 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
320 error = xfs_trans_commit(tp);
321
322 return error;
323 }
324
325 STATIC int
xfs_fssetdm_by_handle(struct file * parfilp,void __user * arg)326 xfs_fssetdm_by_handle(
327 struct file *parfilp,
328 void __user *arg)
329 {
330 int error;
331 struct fsdmidata fsd;
332 xfs_fsop_setdm_handlereq_t dmhreq;
333 struct dentry *dentry;
334
335 if (!capable(CAP_MKNOD))
336 return -EPERM;
337 if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
338 return -EFAULT;
339
340 error = mnt_want_write_file(parfilp);
341 if (error)
342 return error;
343
344 dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
345 if (IS_ERR(dentry)) {
346 mnt_drop_write_file(parfilp);
347 return PTR_ERR(dentry);
348 }
349
350 if (IS_IMMUTABLE(d_inode(dentry)) || IS_APPEND(d_inode(dentry))) {
351 error = -EPERM;
352 goto out;
353 }
354
355 if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
356 error = -EFAULT;
357 goto out;
358 }
359
360 error = xfs_set_dmattrs(XFS_I(d_inode(dentry)), fsd.fsd_dmevmask,
361 fsd.fsd_dmstate);
362
363 out:
364 mnt_drop_write_file(parfilp);
365 dput(dentry);
366 return error;
367 }
368
369 STATIC int
xfs_attrlist_by_handle(struct file * parfilp,void __user * arg)370 xfs_attrlist_by_handle(
371 struct file *parfilp,
372 void __user *arg)
373 {
374 int error = -ENOMEM;
375 attrlist_cursor_kern_t *cursor;
376 struct xfs_fsop_attrlist_handlereq __user *p = arg;
377 xfs_fsop_attrlist_handlereq_t al_hreq;
378 struct dentry *dentry;
379 char *kbuf;
380
381 if (!capable(CAP_SYS_ADMIN))
382 return -EPERM;
383 if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
384 return -EFAULT;
385 if (al_hreq.buflen < sizeof(struct attrlist) ||
386 al_hreq.buflen > XFS_XATTR_LIST_MAX)
387 return -EINVAL;
388
389 /*
390 * Reject flags, only allow namespaces.
391 */
392 if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
393 return -EINVAL;
394
395 dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
396 if (IS_ERR(dentry))
397 return PTR_ERR(dentry);
398
399 kbuf = kmem_zalloc_large(al_hreq.buflen, 0);
400 if (!kbuf)
401 goto out_dput;
402
403 cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
404 error = xfs_attr_list(XFS_I(d_inode(dentry)), kbuf, al_hreq.buflen,
405 al_hreq.flags, cursor);
406 if (error)
407 goto out_kfree;
408
409 if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t))) {
410 error = -EFAULT;
411 goto out_kfree;
412 }
413
414 if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
415 error = -EFAULT;
416
417 out_kfree:
418 kmem_free(kbuf);
419 out_dput:
420 dput(dentry);
421 return error;
422 }
423
424 int
xfs_attrmulti_attr_get(struct inode * inode,unsigned char * name,unsigned char __user * ubuf,uint32_t * len,uint32_t flags)425 xfs_attrmulti_attr_get(
426 struct inode *inode,
427 unsigned char *name,
428 unsigned char __user *ubuf,
429 uint32_t *len,
430 uint32_t flags)
431 {
432 unsigned char *kbuf;
433 int error = -EFAULT;
434
435 if (*len > XFS_XATTR_SIZE_MAX)
436 return -EINVAL;
437 kbuf = kmem_zalloc_large(*len, 0);
438 if (!kbuf)
439 return -ENOMEM;
440
441 error = xfs_attr_get(XFS_I(inode), name, &kbuf, (int *)len, flags);
442 if (error)
443 goto out_kfree;
444
445 if (copy_to_user(ubuf, kbuf, *len))
446 error = -EFAULT;
447
448 out_kfree:
449 kmem_free(kbuf);
450 return error;
451 }
452
453 int
xfs_attrmulti_attr_set(struct inode * inode,unsigned char * name,const unsigned char __user * ubuf,uint32_t len,uint32_t flags)454 xfs_attrmulti_attr_set(
455 struct inode *inode,
456 unsigned char *name,
457 const unsigned char __user *ubuf,
458 uint32_t len,
459 uint32_t flags)
460 {
461 unsigned char *kbuf;
462 int error;
463
464 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
465 return -EPERM;
466 if (len > XFS_XATTR_SIZE_MAX)
467 return -EINVAL;
468
469 kbuf = memdup_user(ubuf, len);
470 if (IS_ERR(kbuf))
471 return PTR_ERR(kbuf);
472
473 error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);
474 if (!error)
475 xfs_forget_acl(inode, name, flags);
476 kfree(kbuf);
477 return error;
478 }
479
480 int
xfs_attrmulti_attr_remove(struct inode * inode,unsigned char * name,uint32_t flags)481 xfs_attrmulti_attr_remove(
482 struct inode *inode,
483 unsigned char *name,
484 uint32_t flags)
485 {
486 int error;
487
488 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
489 return -EPERM;
490 error = xfs_attr_remove(XFS_I(inode), name, flags);
491 if (!error)
492 xfs_forget_acl(inode, name, flags);
493 return error;
494 }
495
496 STATIC int
xfs_attrmulti_by_handle(struct file * parfilp,void __user * arg)497 xfs_attrmulti_by_handle(
498 struct file *parfilp,
499 void __user *arg)
500 {
501 int error;
502 xfs_attr_multiop_t *ops;
503 xfs_fsop_attrmulti_handlereq_t am_hreq;
504 struct dentry *dentry;
505 unsigned int i, size;
506 unsigned char *attr_name;
507
508 if (!capable(CAP_SYS_ADMIN))
509 return -EPERM;
510 if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
511 return -EFAULT;
512
513 /* overflow check */
514 if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
515 return -E2BIG;
516
517 dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
518 if (IS_ERR(dentry))
519 return PTR_ERR(dentry);
520
521 error = -E2BIG;
522 size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
523 if (!size || size > 16 * PAGE_SIZE)
524 goto out_dput;
525
526 ops = memdup_user(am_hreq.ops, size);
527 if (IS_ERR(ops)) {
528 error = PTR_ERR(ops);
529 goto out_dput;
530 }
531
532 error = -ENOMEM;
533 attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
534 if (!attr_name)
535 goto out_kfree_ops;
536
537 error = 0;
538 for (i = 0; i < am_hreq.opcount; i++) {
539 ops[i].am_error = strncpy_from_user((char *)attr_name,
540 ops[i].am_attrname, MAXNAMELEN);
541 if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
542 error = -ERANGE;
543 if (ops[i].am_error < 0)
544 break;
545
546 switch (ops[i].am_opcode) {
547 case ATTR_OP_GET:
548 ops[i].am_error = xfs_attrmulti_attr_get(
549 d_inode(dentry), attr_name,
550 ops[i].am_attrvalue, &ops[i].am_length,
551 ops[i].am_flags);
552 break;
553 case ATTR_OP_SET:
554 ops[i].am_error = mnt_want_write_file(parfilp);
555 if (ops[i].am_error)
556 break;
557 ops[i].am_error = xfs_attrmulti_attr_set(
558 d_inode(dentry), attr_name,
559 ops[i].am_attrvalue, ops[i].am_length,
560 ops[i].am_flags);
561 mnt_drop_write_file(parfilp);
562 break;
563 case ATTR_OP_REMOVE:
564 ops[i].am_error = mnt_want_write_file(parfilp);
565 if (ops[i].am_error)
566 break;
567 ops[i].am_error = xfs_attrmulti_attr_remove(
568 d_inode(dentry), attr_name,
569 ops[i].am_flags);
570 mnt_drop_write_file(parfilp);
571 break;
572 default:
573 ops[i].am_error = -EINVAL;
574 }
575 }
576
577 if (copy_to_user(am_hreq.ops, ops, size))
578 error = -EFAULT;
579
580 kfree(attr_name);
581 out_kfree_ops:
582 kfree(ops);
583 out_dput:
584 dput(dentry);
585 return error;
586 }
587
588 int
xfs_ioc_space(struct file * filp,unsigned int cmd,xfs_flock64_t * bf)589 xfs_ioc_space(
590 struct file *filp,
591 unsigned int cmd,
592 xfs_flock64_t *bf)
593 {
594 struct inode *inode = file_inode(filp);
595 struct xfs_inode *ip = XFS_I(inode);
596 struct iattr iattr;
597 enum xfs_prealloc_flags flags = 0;
598 uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
599 int error;
600
601 if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
602 return -EPERM;
603
604 if (!(filp->f_mode & FMODE_WRITE))
605 return -EBADF;
606
607 if (!S_ISREG(inode->i_mode))
608 return -EINVAL;
609
610 if (filp->f_flags & O_DSYNC)
611 flags |= XFS_PREALLOC_SYNC;
612 if (filp->f_mode & FMODE_NOCMTIME)
613 flags |= XFS_PREALLOC_INVISIBLE;
614
615 error = mnt_want_write_file(filp);
616 if (error)
617 return error;
618
619 xfs_ilock(ip, iolock);
620 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
621 if (error)
622 goto out_unlock;
623
624 switch (bf->l_whence) {
625 case 0: /*SEEK_SET*/
626 break;
627 case 1: /*SEEK_CUR*/
628 bf->l_start += filp->f_pos;
629 break;
630 case 2: /*SEEK_END*/
631 bf->l_start += XFS_ISIZE(ip);
632 break;
633 default:
634 error = -EINVAL;
635 goto out_unlock;
636 }
637
638 /*
639 * length of <= 0 for resv/unresv/zero is invalid. length for
640 * alloc/free is ignored completely and we have no idea what userspace
641 * might have set it to, so set it to zero to allow range
642 * checks to pass.
643 */
644 switch (cmd) {
645 case XFS_IOC_ZERO_RANGE:
646 case XFS_IOC_RESVSP:
647 case XFS_IOC_RESVSP64:
648 case XFS_IOC_UNRESVSP:
649 case XFS_IOC_UNRESVSP64:
650 if (bf->l_len <= 0) {
651 error = -EINVAL;
652 goto out_unlock;
653 }
654 break;
655 default:
656 bf->l_len = 0;
657 break;
658 }
659
660 if (bf->l_start < 0 ||
661 bf->l_start > inode->i_sb->s_maxbytes ||
662 bf->l_start + bf->l_len < 0 ||
663 bf->l_start + bf->l_len >= inode->i_sb->s_maxbytes) {
664 error = -EINVAL;
665 goto out_unlock;
666 }
667
668 switch (cmd) {
669 case XFS_IOC_ZERO_RANGE:
670 flags |= XFS_PREALLOC_SET;
671 error = xfs_zero_file_space(ip, bf->l_start, bf->l_len);
672 break;
673 case XFS_IOC_RESVSP:
674 case XFS_IOC_RESVSP64:
675 flags |= XFS_PREALLOC_SET;
676 error = xfs_alloc_file_space(ip, bf->l_start, bf->l_len,
677 XFS_BMAPI_PREALLOC);
678 break;
679 case XFS_IOC_UNRESVSP:
680 case XFS_IOC_UNRESVSP64:
681 error = xfs_free_file_space(ip, bf->l_start, bf->l_len);
682 break;
683 case XFS_IOC_ALLOCSP:
684 case XFS_IOC_ALLOCSP64:
685 case XFS_IOC_FREESP:
686 case XFS_IOC_FREESP64:
687 flags |= XFS_PREALLOC_CLEAR;
688 if (bf->l_start > XFS_ISIZE(ip)) {
689 error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
690 bf->l_start - XFS_ISIZE(ip), 0);
691 if (error)
692 goto out_unlock;
693 }
694
695 iattr.ia_valid = ATTR_SIZE;
696 iattr.ia_size = bf->l_start;
697
698 error = xfs_vn_setattr_size(file_dentry(filp), &iattr);
699 break;
700 default:
701 ASSERT(0);
702 error = -EINVAL;
703 }
704
705 if (error)
706 goto out_unlock;
707
708 error = xfs_update_prealloc_flags(ip, flags);
709
710 out_unlock:
711 xfs_iunlock(ip, iolock);
712 mnt_drop_write_file(filp);
713 return error;
714 }
715
716 /* Return 0 on success or positive error */
717 int
xfs_fsbulkstat_one_fmt(struct xfs_ibulk * breq,const struct xfs_bulkstat * bstat)718 xfs_fsbulkstat_one_fmt(
719 struct xfs_ibulk *breq,
720 const struct xfs_bulkstat *bstat)
721 {
722 struct xfs_bstat bs1;
723
724 xfs_bulkstat_to_bstat(breq->mp, &bs1, bstat);
725 if (copy_to_user(breq->ubuffer, &bs1, sizeof(bs1)))
726 return -EFAULT;
727 return xfs_ibulk_advance(breq, sizeof(struct xfs_bstat));
728 }
729
730 int
xfs_fsinumbers_fmt(struct xfs_ibulk * breq,const struct xfs_inumbers * igrp)731 xfs_fsinumbers_fmt(
732 struct xfs_ibulk *breq,
733 const struct xfs_inumbers *igrp)
734 {
735 struct xfs_inogrp ig1;
736
737 xfs_inumbers_to_inogrp(&ig1, igrp);
738 if (copy_to_user(breq->ubuffer, &ig1, sizeof(struct xfs_inogrp)))
739 return -EFAULT;
740 return xfs_ibulk_advance(breq, sizeof(struct xfs_inogrp));
741 }
742
743 STATIC int
xfs_ioc_fsbulkstat(xfs_mount_t * mp,unsigned int cmd,void __user * arg)744 xfs_ioc_fsbulkstat(
745 xfs_mount_t *mp,
746 unsigned int cmd,
747 void __user *arg)
748 {
749 struct xfs_fsop_bulkreq bulkreq;
750 struct xfs_ibulk breq = {
751 .mp = mp,
752 .ocount = 0,
753 };
754 xfs_ino_t lastino;
755 int error;
756
757 /* done = 1 if there are more stats to get and if bulkstat */
758 /* should be called again (unused here, but used in dmapi) */
759
760 if (!capable(CAP_SYS_ADMIN))
761 return -EPERM;
762
763 if (XFS_FORCED_SHUTDOWN(mp))
764 return -EIO;
765
766 if (copy_from_user(&bulkreq, arg, sizeof(struct xfs_fsop_bulkreq)))
767 return -EFAULT;
768
769 if (copy_from_user(&lastino, bulkreq.lastip, sizeof(__s64)))
770 return -EFAULT;
771
772 if (bulkreq.icount <= 0)
773 return -EINVAL;
774
775 if (bulkreq.ubuffer == NULL)
776 return -EINVAL;
777
778 breq.ubuffer = bulkreq.ubuffer;
779 breq.icount = bulkreq.icount;
780
781 /*
782 * FSBULKSTAT_SINGLE expects that *lastip contains the inode number
783 * that we want to stat. However, FSINUMBERS and FSBULKSTAT expect
784 * that *lastip contains either zero or the number of the last inode to
785 * be examined by the previous call and return results starting with
786 * the next inode after that. The new bulk request back end functions
787 * take the inode to start with, so we have to compute the startino
788 * parameter from lastino to maintain correct function. lastino == 0
789 * is a special case because it has traditionally meant "first inode
790 * in filesystem".
791 */
792 if (cmd == XFS_IOC_FSINUMBERS) {
793 breq.startino = lastino ? lastino + 1 : 0;
794 error = xfs_inumbers(&breq, xfs_fsinumbers_fmt);
795 lastino = breq.startino - 1;
796 } else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE) {
797 breq.startino = lastino;
798 breq.icount = 1;
799 error = xfs_bulkstat_one(&breq, xfs_fsbulkstat_one_fmt);
800 } else { /* XFS_IOC_FSBULKSTAT */
801 breq.startino = lastino ? lastino + 1 : 0;
802 error = xfs_bulkstat(&breq, xfs_fsbulkstat_one_fmt);
803 lastino = breq.startino - 1;
804 }
805
806 if (error)
807 return error;
808
809 if (bulkreq.lastip != NULL &&
810 copy_to_user(bulkreq.lastip, &lastino, sizeof(xfs_ino_t)))
811 return -EFAULT;
812
813 if (bulkreq.ocount != NULL &&
814 copy_to_user(bulkreq.ocount, &breq.ocount, sizeof(__s32)))
815 return -EFAULT;
816
817 return 0;
818 }
819
820 /* Return 0 on success or positive error */
821 static int
xfs_bulkstat_fmt(struct xfs_ibulk * breq,const struct xfs_bulkstat * bstat)822 xfs_bulkstat_fmt(
823 struct xfs_ibulk *breq,
824 const struct xfs_bulkstat *bstat)
825 {
826 if (copy_to_user(breq->ubuffer, bstat, sizeof(struct xfs_bulkstat)))
827 return -EFAULT;
828 return xfs_ibulk_advance(breq, sizeof(struct xfs_bulkstat));
829 }
830
831 /*
832 * Check the incoming bulk request @hdr from userspace and initialize the
833 * internal @breq bulk request appropriately. Returns 0 if the bulk request
834 * should proceed; -ECANCELED if there's nothing to do; or the usual
835 * negative error code.
836 */
837 static int
xfs_bulk_ireq_setup(struct xfs_mount * mp,struct xfs_bulk_ireq * hdr,struct xfs_ibulk * breq,void __user * ubuffer)838 xfs_bulk_ireq_setup(
839 struct xfs_mount *mp,
840 struct xfs_bulk_ireq *hdr,
841 struct xfs_ibulk *breq,
842 void __user *ubuffer)
843 {
844 if (hdr->icount == 0 ||
845 (hdr->flags & ~XFS_BULK_IREQ_FLAGS_ALL) ||
846 memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved)))
847 return -EINVAL;
848
849 breq->startino = hdr->ino;
850 breq->ubuffer = ubuffer;
851 breq->icount = hdr->icount;
852 breq->ocount = 0;
853 breq->flags = 0;
854
855 /*
856 * The @ino parameter is a special value, so we must look it up here.
857 * We're not allowed to have IREQ_AGNO, and we only return one inode
858 * worth of data.
859 */
860 if (hdr->flags & XFS_BULK_IREQ_SPECIAL) {
861 if (hdr->flags & XFS_BULK_IREQ_AGNO)
862 return -EINVAL;
863
864 switch (hdr->ino) {
865 case XFS_BULK_IREQ_SPECIAL_ROOT:
866 hdr->ino = mp->m_sb.sb_rootino;
867 break;
868 default:
869 return -EINVAL;
870 }
871 breq->icount = 1;
872 }
873
874 /*
875 * The IREQ_AGNO flag means that we only want results from a given AG.
876 * If @hdr->ino is zero, we start iterating in that AG. If @hdr->ino is
877 * beyond the specified AG then we return no results.
878 */
879 if (hdr->flags & XFS_BULK_IREQ_AGNO) {
880 if (hdr->agno >= mp->m_sb.sb_agcount)
881 return -EINVAL;
882
883 if (breq->startino == 0)
884 breq->startino = XFS_AGINO_TO_INO(mp, hdr->agno, 0);
885 else if (XFS_INO_TO_AGNO(mp, breq->startino) < hdr->agno)
886 return -EINVAL;
887
888 breq->flags |= XFS_IBULK_SAME_AG;
889
890 /* Asking for an inode past the end of the AG? We're done! */
891 if (XFS_INO_TO_AGNO(mp, breq->startino) > hdr->agno)
892 return -ECANCELED;
893 } else if (hdr->agno)
894 return -EINVAL;
895
896 /* Asking for an inode past the end of the FS? We're done! */
897 if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount)
898 return -ECANCELED;
899
900 return 0;
901 }
902
903 /*
904 * Update the userspace bulk request @hdr to reflect the end state of the
905 * internal bulk request @breq.
906 */
907 static void
xfs_bulk_ireq_teardown(struct xfs_bulk_ireq * hdr,struct xfs_ibulk * breq)908 xfs_bulk_ireq_teardown(
909 struct xfs_bulk_ireq *hdr,
910 struct xfs_ibulk *breq)
911 {
912 hdr->ino = breq->startino;
913 hdr->ocount = breq->ocount;
914 }
915
916 /* Handle the v5 bulkstat ioctl. */
917 STATIC int
xfs_ioc_bulkstat(struct xfs_mount * mp,unsigned int cmd,struct xfs_bulkstat_req __user * arg)918 xfs_ioc_bulkstat(
919 struct xfs_mount *mp,
920 unsigned int cmd,
921 struct xfs_bulkstat_req __user *arg)
922 {
923 struct xfs_bulk_ireq hdr;
924 struct xfs_ibulk breq = {
925 .mp = mp,
926 };
927 int error;
928
929 if (!capable(CAP_SYS_ADMIN))
930 return -EPERM;
931
932 if (XFS_FORCED_SHUTDOWN(mp))
933 return -EIO;
934
935 if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr)))
936 return -EFAULT;
937
938 error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->bulkstat);
939 if (error == -ECANCELED)
940 goto out_teardown;
941 if (error < 0)
942 return error;
943
944 error = xfs_bulkstat(&breq, xfs_bulkstat_fmt);
945 if (error)
946 return error;
947
948 out_teardown:
949 xfs_bulk_ireq_teardown(&hdr, &breq);
950 if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr)))
951 return -EFAULT;
952
953 return 0;
954 }
955
956 STATIC int
xfs_inumbers_fmt(struct xfs_ibulk * breq,const struct xfs_inumbers * igrp)957 xfs_inumbers_fmt(
958 struct xfs_ibulk *breq,
959 const struct xfs_inumbers *igrp)
960 {
961 if (copy_to_user(breq->ubuffer, igrp, sizeof(struct xfs_inumbers)))
962 return -EFAULT;
963 return xfs_ibulk_advance(breq, sizeof(struct xfs_inumbers));
964 }
965
966 /* Handle the v5 inumbers ioctl. */
967 STATIC int
xfs_ioc_inumbers(struct xfs_mount * mp,unsigned int cmd,struct xfs_inumbers_req __user * arg)968 xfs_ioc_inumbers(
969 struct xfs_mount *mp,
970 unsigned int cmd,
971 struct xfs_inumbers_req __user *arg)
972 {
973 struct xfs_bulk_ireq hdr;
974 struct xfs_ibulk breq = {
975 .mp = mp,
976 };
977 int error;
978
979 if (!capable(CAP_SYS_ADMIN))
980 return -EPERM;
981
982 if (XFS_FORCED_SHUTDOWN(mp))
983 return -EIO;
984
985 if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr)))
986 return -EFAULT;
987
988 error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->inumbers);
989 if (error == -ECANCELED)
990 goto out_teardown;
991 if (error < 0)
992 return error;
993
994 error = xfs_inumbers(&breq, xfs_inumbers_fmt);
995 if (error)
996 return error;
997
998 out_teardown:
999 xfs_bulk_ireq_teardown(&hdr, &breq);
1000 if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr)))
1001 return -EFAULT;
1002
1003 return 0;
1004 }
1005
1006 STATIC int
xfs_ioc_fsgeometry(struct xfs_mount * mp,void __user * arg,int struct_version)1007 xfs_ioc_fsgeometry(
1008 struct xfs_mount *mp,
1009 void __user *arg,
1010 int struct_version)
1011 {
1012 struct xfs_fsop_geom fsgeo;
1013 size_t len;
1014
1015 xfs_fs_geometry(&mp->m_sb, &fsgeo, struct_version);
1016
1017 if (struct_version <= 3)
1018 len = sizeof(struct xfs_fsop_geom_v1);
1019 else if (struct_version == 4)
1020 len = sizeof(struct xfs_fsop_geom_v4);
1021 else {
1022 xfs_fsop_geom_health(mp, &fsgeo);
1023 len = sizeof(fsgeo);
1024 }
1025
1026 if (copy_to_user(arg, &fsgeo, len))
1027 return -EFAULT;
1028 return 0;
1029 }
1030
1031 STATIC int
xfs_ioc_ag_geometry(struct xfs_mount * mp,void __user * arg)1032 xfs_ioc_ag_geometry(
1033 struct xfs_mount *mp,
1034 void __user *arg)
1035 {
1036 struct xfs_ag_geometry ageo;
1037 int error;
1038
1039 if (copy_from_user(&ageo, arg, sizeof(ageo)))
1040 return -EFAULT;
1041 if (ageo.ag_flags)
1042 return -EINVAL;
1043 if (memchr_inv(&ageo.ag_reserved, 0, sizeof(ageo.ag_reserved)))
1044 return -EINVAL;
1045
1046 error = xfs_ag_get_geometry(mp, ageo.ag_number, &ageo);
1047 if (error)
1048 return error;
1049
1050 if (copy_to_user(arg, &ageo, sizeof(ageo)))
1051 return -EFAULT;
1052 return 0;
1053 }
1054
1055 /*
1056 * Linux extended inode flags interface.
1057 */
1058
1059 STATIC unsigned int
xfs_merge_ioc_xflags(unsigned int flags,unsigned int start)1060 xfs_merge_ioc_xflags(
1061 unsigned int flags,
1062 unsigned int start)
1063 {
1064 unsigned int xflags = start;
1065
1066 if (flags & FS_IMMUTABLE_FL)
1067 xflags |= FS_XFLAG_IMMUTABLE;
1068 else
1069 xflags &= ~FS_XFLAG_IMMUTABLE;
1070 if (flags & FS_APPEND_FL)
1071 xflags |= FS_XFLAG_APPEND;
1072 else
1073 xflags &= ~FS_XFLAG_APPEND;
1074 if (flags & FS_SYNC_FL)
1075 xflags |= FS_XFLAG_SYNC;
1076 else
1077 xflags &= ~FS_XFLAG_SYNC;
1078 if (flags & FS_NOATIME_FL)
1079 xflags |= FS_XFLAG_NOATIME;
1080 else
1081 xflags &= ~FS_XFLAG_NOATIME;
1082 if (flags & FS_NODUMP_FL)
1083 xflags |= FS_XFLAG_NODUMP;
1084 else
1085 xflags &= ~FS_XFLAG_NODUMP;
1086
1087 return xflags;
1088 }
1089
1090 STATIC unsigned int
xfs_di2lxflags(uint16_t di_flags)1091 xfs_di2lxflags(
1092 uint16_t di_flags)
1093 {
1094 unsigned int flags = 0;
1095
1096 if (di_flags & XFS_DIFLAG_IMMUTABLE)
1097 flags |= FS_IMMUTABLE_FL;
1098 if (di_flags & XFS_DIFLAG_APPEND)
1099 flags |= FS_APPEND_FL;
1100 if (di_flags & XFS_DIFLAG_SYNC)
1101 flags |= FS_SYNC_FL;
1102 if (di_flags & XFS_DIFLAG_NOATIME)
1103 flags |= FS_NOATIME_FL;
1104 if (di_flags & XFS_DIFLAG_NODUMP)
1105 flags |= FS_NODUMP_FL;
1106 return flags;
1107 }
1108
1109 static void
xfs_fill_fsxattr(struct xfs_inode * ip,bool attr,struct fsxattr * fa)1110 xfs_fill_fsxattr(
1111 struct xfs_inode *ip,
1112 bool attr,
1113 struct fsxattr *fa)
1114 {
1115 simple_fill_fsxattr(fa, xfs_ip2xflags(ip));
1116 fa->fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
1117 fa->fsx_cowextsize = ip->i_d.di_cowextsize <<
1118 ip->i_mount->m_sb.sb_blocklog;
1119 fa->fsx_projid = xfs_get_projid(ip);
1120
1121 if (attr) {
1122 if (ip->i_afp) {
1123 if (ip->i_afp->if_flags & XFS_IFEXTENTS)
1124 fa->fsx_nextents = xfs_iext_count(ip->i_afp);
1125 else
1126 fa->fsx_nextents = ip->i_d.di_anextents;
1127 } else
1128 fa->fsx_nextents = 0;
1129 } else {
1130 if (ip->i_df.if_flags & XFS_IFEXTENTS)
1131 fa->fsx_nextents = xfs_iext_count(&ip->i_df);
1132 else
1133 fa->fsx_nextents = ip->i_d.di_nextents;
1134 }
1135 }
1136
1137 STATIC int
xfs_ioc_fsgetxattr(xfs_inode_t * ip,int attr,void __user * arg)1138 xfs_ioc_fsgetxattr(
1139 xfs_inode_t *ip,
1140 int attr,
1141 void __user *arg)
1142 {
1143 struct fsxattr fa;
1144
1145 xfs_ilock(ip, XFS_ILOCK_SHARED);
1146 xfs_fill_fsxattr(ip, attr, &fa);
1147 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1148
1149 if (copy_to_user(arg, &fa, sizeof(fa)))
1150 return -EFAULT;
1151 return 0;
1152 }
1153
1154 STATIC uint16_t
xfs_flags2diflags(struct xfs_inode * ip,unsigned int xflags)1155 xfs_flags2diflags(
1156 struct xfs_inode *ip,
1157 unsigned int xflags)
1158 {
1159 /* can't set PREALLOC this way, just preserve it */
1160 uint16_t di_flags =
1161 (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
1162
1163 if (xflags & FS_XFLAG_IMMUTABLE)
1164 di_flags |= XFS_DIFLAG_IMMUTABLE;
1165 if (xflags & FS_XFLAG_APPEND)
1166 di_flags |= XFS_DIFLAG_APPEND;
1167 if (xflags & FS_XFLAG_SYNC)
1168 di_flags |= XFS_DIFLAG_SYNC;
1169 if (xflags & FS_XFLAG_NOATIME)
1170 di_flags |= XFS_DIFLAG_NOATIME;
1171 if (xflags & FS_XFLAG_NODUMP)
1172 di_flags |= XFS_DIFLAG_NODUMP;
1173 if (xflags & FS_XFLAG_NODEFRAG)
1174 di_flags |= XFS_DIFLAG_NODEFRAG;
1175 if (xflags & FS_XFLAG_FILESTREAM)
1176 di_flags |= XFS_DIFLAG_FILESTREAM;
1177 if (S_ISDIR(VFS_I(ip)->i_mode)) {
1178 if (xflags & FS_XFLAG_RTINHERIT)
1179 di_flags |= XFS_DIFLAG_RTINHERIT;
1180 if (xflags & FS_XFLAG_NOSYMLINKS)
1181 di_flags |= XFS_DIFLAG_NOSYMLINKS;
1182 if (xflags & FS_XFLAG_EXTSZINHERIT)
1183 di_flags |= XFS_DIFLAG_EXTSZINHERIT;
1184 if (xflags & FS_XFLAG_PROJINHERIT)
1185 di_flags |= XFS_DIFLAG_PROJINHERIT;
1186 } else if (S_ISREG(VFS_I(ip)->i_mode)) {
1187 if (xflags & FS_XFLAG_REALTIME)
1188 di_flags |= XFS_DIFLAG_REALTIME;
1189 if (xflags & FS_XFLAG_EXTSIZE)
1190 di_flags |= XFS_DIFLAG_EXTSIZE;
1191 }
1192
1193 return di_flags;
1194 }
1195
1196 STATIC uint64_t
xfs_flags2diflags2(struct xfs_inode * ip,unsigned int xflags)1197 xfs_flags2diflags2(
1198 struct xfs_inode *ip,
1199 unsigned int xflags)
1200 {
1201 uint64_t di_flags2 =
1202 (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK);
1203
1204 if (xflags & FS_XFLAG_DAX)
1205 di_flags2 |= XFS_DIFLAG2_DAX;
1206 if (xflags & FS_XFLAG_COWEXTSIZE)
1207 di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
1208
1209 return di_flags2;
1210 }
1211
1212 STATIC void
xfs_diflags_to_linux(struct xfs_inode * ip)1213 xfs_diflags_to_linux(
1214 struct xfs_inode *ip)
1215 {
1216 struct inode *inode = VFS_I(ip);
1217 unsigned int xflags = xfs_ip2xflags(ip);
1218
1219 if (xflags & FS_XFLAG_IMMUTABLE)
1220 inode->i_flags |= S_IMMUTABLE;
1221 else
1222 inode->i_flags &= ~S_IMMUTABLE;
1223 if (xflags & FS_XFLAG_APPEND)
1224 inode->i_flags |= S_APPEND;
1225 else
1226 inode->i_flags &= ~S_APPEND;
1227 if (xflags & FS_XFLAG_SYNC)
1228 inode->i_flags |= S_SYNC;
1229 else
1230 inode->i_flags &= ~S_SYNC;
1231 if (xflags & FS_XFLAG_NOATIME)
1232 inode->i_flags |= S_NOATIME;
1233 else
1234 inode->i_flags &= ~S_NOATIME;
1235 #if 0 /* disabled until the flag switching races are sorted out */
1236 if (xflags & FS_XFLAG_DAX)
1237 inode->i_flags |= S_DAX;
1238 else
1239 inode->i_flags &= ~S_DAX;
1240 #endif
1241 }
1242
1243 static int
xfs_ioctl_setattr_xflags(struct xfs_trans * tp,struct xfs_inode * ip,struct fsxattr * fa)1244 xfs_ioctl_setattr_xflags(
1245 struct xfs_trans *tp,
1246 struct xfs_inode *ip,
1247 struct fsxattr *fa)
1248 {
1249 struct xfs_mount *mp = ip->i_mount;
1250 uint64_t di_flags2;
1251
1252 /* Can't change realtime flag if any extents are allocated. */
1253 if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
1254 XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & FS_XFLAG_REALTIME))
1255 return -EINVAL;
1256
1257 /* If realtime flag is set then must have realtime device */
1258 if (fa->fsx_xflags & FS_XFLAG_REALTIME) {
1259 if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 ||
1260 (ip->i_d.di_extsize % mp->m_sb.sb_rextsize))
1261 return -EINVAL;
1262 }
1263
1264 /* Clear reflink if we are actually able to set the rt flag. */
1265 if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip))
1266 ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
1267
1268 /* Don't allow us to set DAX mode for a reflinked file for now. */
1269 if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip))
1270 return -EINVAL;
1271
1272 /* diflags2 only valid for v3 inodes. */
1273 di_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);
1274 if (di_flags2 && ip->i_d.di_version < 3)
1275 return -EINVAL;
1276
1277 ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags);
1278 ip->i_d.di_flags2 = di_flags2;
1279
1280 xfs_diflags_to_linux(ip);
1281 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1282 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1283 XFS_STATS_INC(mp, xs_ig_attrchg);
1284 return 0;
1285 }
1286
1287 /*
1288 * If we are changing DAX flags, we have to ensure the file is clean and any
1289 * cached objects in the address space are invalidated and removed. This
1290 * requires us to lock out other IO and page faults similar to a truncate
1291 * operation. The locks need to be held until the transaction has been committed
1292 * so that the cache invalidation is atomic with respect to the DAX flag
1293 * manipulation.
1294 */
1295 static int
xfs_ioctl_setattr_dax_invalidate(struct xfs_inode * ip,struct fsxattr * fa,int * join_flags)1296 xfs_ioctl_setattr_dax_invalidate(
1297 struct xfs_inode *ip,
1298 struct fsxattr *fa,
1299 int *join_flags)
1300 {
1301 struct inode *inode = VFS_I(ip);
1302 struct super_block *sb = inode->i_sb;
1303 int error;
1304
1305 *join_flags = 0;
1306
1307 /*
1308 * It is only valid to set the DAX flag on regular files and
1309 * directories on filesystems where the block size is equal to the page
1310 * size. On directories it serves as an inherited hint so we don't
1311 * have to check the device for dax support or flush pagecache.
1312 */
1313 if (fa->fsx_xflags & FS_XFLAG_DAX) {
1314 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
1315 return -EINVAL;
1316 if (!bdev_dax_supported(xfs_find_bdev_for_inode(VFS_I(ip)),
1317 sb->s_blocksize))
1318 return -EINVAL;
1319 }
1320
1321 /* If the DAX state is not changing, we have nothing to do here. */
1322 if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode))
1323 return 0;
1324 if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode))
1325 return 0;
1326
1327 if (S_ISDIR(inode->i_mode))
1328 return 0;
1329
1330 /* lock, flush and invalidate mapping in preparation for flag change */
1331 xfs_ilock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
1332 error = filemap_write_and_wait(inode->i_mapping);
1333 if (error)
1334 goto out_unlock;
1335 error = invalidate_inode_pages2(inode->i_mapping);
1336 if (error)
1337 goto out_unlock;
1338
1339 *join_flags = XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL;
1340 return 0;
1341
1342 out_unlock:
1343 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
1344 return error;
1345
1346 }
1347
1348 /*
1349 * Set up the transaction structure for the setattr operation, checking that we
1350 * have permission to do so. On success, return a clean transaction and the
1351 * inode locked exclusively ready for further operation specific checks. On
1352 * failure, return an error without modifying or locking the inode.
1353 *
1354 * The inode might already be IO locked on call. If this is the case, it is
1355 * indicated in @join_flags and we take full responsibility for ensuring they
1356 * are unlocked from now on. Hence if we have an error here, we still have to
1357 * unlock them. Otherwise, once they are joined to the transaction, they will
1358 * be unlocked on commit/cancel.
1359 */
1360 static struct xfs_trans *
xfs_ioctl_setattr_get_trans(struct xfs_inode * ip,int join_flags)1361 xfs_ioctl_setattr_get_trans(
1362 struct xfs_inode *ip,
1363 int join_flags)
1364 {
1365 struct xfs_mount *mp = ip->i_mount;
1366 struct xfs_trans *tp;
1367 int error = -EROFS;
1368
1369 if (mp->m_flags & XFS_MOUNT_RDONLY)
1370 goto out_unlock;
1371 error = -EIO;
1372 if (XFS_FORCED_SHUTDOWN(mp))
1373 goto out_unlock;
1374
1375 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
1376 if (error)
1377 goto out_unlock;
1378
1379 xfs_ilock(ip, XFS_ILOCK_EXCL);
1380 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | join_flags);
1381 join_flags = 0;
1382
1383 /*
1384 * CAP_FOWNER overrides the following restrictions:
1385 *
1386 * The user ID of the calling process must be equal to the file owner
1387 * ID, except in cases where the CAP_FSETID capability is applicable.
1388 */
1389 if (!inode_owner_or_capable(VFS_I(ip))) {
1390 error = -EPERM;
1391 goto out_cancel;
1392 }
1393
1394 if (mp->m_flags & XFS_MOUNT_WSYNC)
1395 xfs_trans_set_sync(tp);
1396
1397 return tp;
1398
1399 out_cancel:
1400 xfs_trans_cancel(tp);
1401 out_unlock:
1402 if (join_flags)
1403 xfs_iunlock(ip, join_flags);
1404 return ERR_PTR(error);
1405 }
1406
1407 /*
1408 * extent size hint validation is somewhat cumbersome. Rules are:
1409 *
1410 * 1. extent size hint is only valid for directories and regular files
1411 * 2. FS_XFLAG_EXTSIZE is only valid for regular files
1412 * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
1413 * 4. can only be changed on regular files if no extents are allocated
1414 * 5. can be changed on directories at any time
1415 * 6. extsize hint of 0 turns off hints, clears inode flags.
1416 * 7. Extent size must be a multiple of the appropriate block size.
1417 * 8. for non-realtime files, the extent size hint must be limited
1418 * to half the AG size to avoid alignment extending the extent beyond the
1419 * limits of the AG.
1420 *
1421 * Please keep this function in sync with xfs_scrub_inode_extsize.
1422 */
1423 static int
xfs_ioctl_setattr_check_extsize(struct xfs_inode * ip,struct fsxattr * fa)1424 xfs_ioctl_setattr_check_extsize(
1425 struct xfs_inode *ip,
1426 struct fsxattr *fa)
1427 {
1428 struct xfs_mount *mp = ip->i_mount;
1429 xfs_extlen_t size;
1430 xfs_fsblock_t extsize_fsb;
1431
1432 if (S_ISREG(VFS_I(ip)->i_mode) && ip->i_d.di_nextents &&
1433 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize))
1434 return -EINVAL;
1435
1436 if (fa->fsx_extsize == 0)
1437 return 0;
1438
1439 extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize);
1440 if (extsize_fsb > MAXEXTLEN)
1441 return -EINVAL;
1442
1443 if (XFS_IS_REALTIME_INODE(ip) ||
1444 (fa->fsx_xflags & FS_XFLAG_REALTIME)) {
1445 size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
1446 } else {
1447 size = mp->m_sb.sb_blocksize;
1448 if (extsize_fsb > mp->m_sb.sb_agblocks / 2)
1449 return -EINVAL;
1450 }
1451
1452 if (fa->fsx_extsize % size)
1453 return -EINVAL;
1454
1455 return 0;
1456 }
1457
1458 /*
1459 * CoW extent size hint validation rules are:
1460 *
1461 * 1. CoW extent size hint can only be set if reflink is enabled on the fs.
1462 * The inode does not have to have any shared blocks, but it must be a v3.
1463 * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
1464 * for a directory, the hint is propagated to new files.
1465 * 3. Can be changed on files & directories at any time.
1466 * 4. CoW extsize hint of 0 turns off hints, clears inode flags.
1467 * 5. Extent size must be a multiple of the appropriate block size.
1468 * 6. The extent size hint must be limited to half the AG size to avoid
1469 * alignment extending the extent beyond the limits of the AG.
1470 *
1471 * Please keep this function in sync with xfs_scrub_inode_cowextsize.
1472 */
1473 static int
xfs_ioctl_setattr_check_cowextsize(struct xfs_inode * ip,struct fsxattr * fa)1474 xfs_ioctl_setattr_check_cowextsize(
1475 struct xfs_inode *ip,
1476 struct fsxattr *fa)
1477 {
1478 struct xfs_mount *mp = ip->i_mount;
1479 xfs_extlen_t size;
1480 xfs_fsblock_t cowextsize_fsb;
1481
1482 if (!(fa->fsx_xflags & FS_XFLAG_COWEXTSIZE))
1483 return 0;
1484
1485 if (!xfs_sb_version_hasreflink(&ip->i_mount->m_sb) ||
1486 ip->i_d.di_version != 3)
1487 return -EINVAL;
1488
1489 if (fa->fsx_cowextsize == 0)
1490 return 0;
1491
1492 cowextsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_cowextsize);
1493 if (cowextsize_fsb > MAXEXTLEN)
1494 return -EINVAL;
1495
1496 size = mp->m_sb.sb_blocksize;
1497 if (cowextsize_fsb > mp->m_sb.sb_agblocks / 2)
1498 return -EINVAL;
1499
1500 if (fa->fsx_cowextsize % size)
1501 return -EINVAL;
1502
1503 return 0;
1504 }
1505
1506 static int
xfs_ioctl_setattr_check_projid(struct xfs_inode * ip,struct fsxattr * fa)1507 xfs_ioctl_setattr_check_projid(
1508 struct xfs_inode *ip,
1509 struct fsxattr *fa)
1510 {
1511 /* Disallow 32bit project ids if projid32bit feature is not enabled. */
1512 if (fa->fsx_projid > (uint16_t)-1 &&
1513 !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
1514 return -EINVAL;
1515 return 0;
1516 }
1517
1518 STATIC int
xfs_ioctl_setattr(xfs_inode_t * ip,struct fsxattr * fa)1519 xfs_ioctl_setattr(
1520 xfs_inode_t *ip,
1521 struct fsxattr *fa)
1522 {
1523 struct fsxattr old_fa;
1524 struct xfs_mount *mp = ip->i_mount;
1525 struct xfs_trans *tp;
1526 struct xfs_dquot *udqp = NULL;
1527 struct xfs_dquot *pdqp = NULL;
1528 struct xfs_dquot *olddquot = NULL;
1529 int code;
1530 int join_flags = 0;
1531
1532 trace_xfs_ioctl_setattr(ip);
1533
1534 code = xfs_ioctl_setattr_check_projid(ip, fa);
1535 if (code)
1536 return code;
1537
1538 /*
1539 * If disk quotas is on, we make sure that the dquots do exist on disk,
1540 * before we start any other transactions. Trying to do this later
1541 * is messy. We don't care to take a readlock to look at the ids
1542 * in inode here, because we can't hold it across the trans_reserve.
1543 * If the IDs do change before we take the ilock, we're covered
1544 * because the i_*dquot fields will get updated anyway.
1545 */
1546 if (XFS_IS_QUOTA_ON(mp)) {
1547 code = xfs_qm_vop_dqalloc(ip, ip->i_d.di_uid,
1548 ip->i_d.di_gid, fa->fsx_projid,
1549 XFS_QMOPT_PQUOTA, &udqp, NULL, &pdqp);
1550 if (code)
1551 return code;
1552 }
1553
1554 /*
1555 * Changing DAX config may require inode locking for mapping
1556 * invalidation. These need to be held all the way to transaction commit
1557 * or cancel time, so need to be passed through to
1558 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
1559 * appropriately.
1560 */
1561 code = xfs_ioctl_setattr_dax_invalidate(ip, fa, &join_flags);
1562 if (code)
1563 goto error_free_dquots;
1564
1565 tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
1566 if (IS_ERR(tp)) {
1567 code = PTR_ERR(tp);
1568 goto error_free_dquots;
1569 }
1570
1571 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) &&
1572 xfs_get_projid(ip) != fa->fsx_projid) {
1573 code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, pdqp,
1574 capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0);
1575 if (code) /* out of quota */
1576 goto error_trans_cancel;
1577 }
1578
1579 xfs_fill_fsxattr(ip, false, &old_fa);
1580 code = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, fa);
1581 if (code)
1582 goto error_trans_cancel;
1583
1584 code = xfs_ioctl_setattr_check_extsize(ip, fa);
1585 if (code)
1586 goto error_trans_cancel;
1587
1588 code = xfs_ioctl_setattr_check_cowextsize(ip, fa);
1589 if (code)
1590 goto error_trans_cancel;
1591
1592 code = xfs_ioctl_setattr_xflags(tp, ip, fa);
1593 if (code)
1594 goto error_trans_cancel;
1595
1596 /*
1597 * Change file ownership. Must be the owner or privileged. CAP_FSETID
1598 * overrides the following restrictions:
1599 *
1600 * The set-user-ID and set-group-ID bits of a file will be cleared upon
1601 * successful return from chown()
1602 */
1603
1604 if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) &&
1605 !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID))
1606 VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID);
1607
1608 /* Change the ownerships and register project quota modifications */
1609 if (xfs_get_projid(ip) != fa->fsx_projid) {
1610 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) {
1611 olddquot = xfs_qm_vop_chown(tp, ip,
1612 &ip->i_pdquot, pdqp);
1613 }
1614 ASSERT(ip->i_d.di_version > 1);
1615 xfs_set_projid(ip, fa->fsx_projid);
1616 }
1617
1618 /*
1619 * Only set the extent size hint if we've already determined that the
1620 * extent size hint should be set on the inode. If no extent size flags
1621 * are set on the inode then unconditionally clear the extent size hint.
1622 */
1623 if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT))
1624 ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
1625 else
1626 ip->i_d.di_extsize = 0;
1627 if (ip->i_d.di_version == 3 &&
1628 (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE))
1629 ip->i_d.di_cowextsize = fa->fsx_cowextsize >>
1630 mp->m_sb.sb_blocklog;
1631 else
1632 ip->i_d.di_cowextsize = 0;
1633
1634 code = xfs_trans_commit(tp);
1635
1636 /*
1637 * Release any dquot(s) the inode had kept before chown.
1638 */
1639 xfs_qm_dqrele(olddquot);
1640 xfs_qm_dqrele(udqp);
1641 xfs_qm_dqrele(pdqp);
1642
1643 return code;
1644
1645 error_trans_cancel:
1646 xfs_trans_cancel(tp);
1647 error_free_dquots:
1648 xfs_qm_dqrele(udqp);
1649 xfs_qm_dqrele(pdqp);
1650 return code;
1651 }
1652
1653 STATIC int
xfs_ioc_fssetxattr(xfs_inode_t * ip,struct file * filp,void __user * arg)1654 xfs_ioc_fssetxattr(
1655 xfs_inode_t *ip,
1656 struct file *filp,
1657 void __user *arg)
1658 {
1659 struct fsxattr fa;
1660 int error;
1661
1662 if (copy_from_user(&fa, arg, sizeof(fa)))
1663 return -EFAULT;
1664
1665 error = mnt_want_write_file(filp);
1666 if (error)
1667 return error;
1668 error = xfs_ioctl_setattr(ip, &fa);
1669 mnt_drop_write_file(filp);
1670 return error;
1671 }
1672
1673 STATIC int
xfs_ioc_getxflags(xfs_inode_t * ip,void __user * arg)1674 xfs_ioc_getxflags(
1675 xfs_inode_t *ip,
1676 void __user *arg)
1677 {
1678 unsigned int flags;
1679
1680 flags = xfs_di2lxflags(ip->i_d.di_flags);
1681 if (copy_to_user(arg, &flags, sizeof(flags)))
1682 return -EFAULT;
1683 return 0;
1684 }
1685
1686 STATIC int
xfs_ioc_setxflags(struct xfs_inode * ip,struct file * filp,void __user * arg)1687 xfs_ioc_setxflags(
1688 struct xfs_inode *ip,
1689 struct file *filp,
1690 void __user *arg)
1691 {
1692 struct xfs_trans *tp;
1693 struct fsxattr fa;
1694 struct fsxattr old_fa;
1695 unsigned int flags;
1696 int join_flags = 0;
1697 int error;
1698
1699 if (copy_from_user(&flags, arg, sizeof(flags)))
1700 return -EFAULT;
1701
1702 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
1703 FS_NOATIME_FL | FS_NODUMP_FL | \
1704 FS_SYNC_FL))
1705 return -EOPNOTSUPP;
1706
1707 fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
1708
1709 error = mnt_want_write_file(filp);
1710 if (error)
1711 return error;
1712
1713 /*
1714 * Changing DAX config may require inode locking for mapping
1715 * invalidation. These need to be held all the way to transaction commit
1716 * or cancel time, so need to be passed through to
1717 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
1718 * appropriately.
1719 */
1720 error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags);
1721 if (error)
1722 goto out_drop_write;
1723
1724 tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
1725 if (IS_ERR(tp)) {
1726 error = PTR_ERR(tp);
1727 goto out_drop_write;
1728 }
1729
1730 xfs_fill_fsxattr(ip, false, &old_fa);
1731 error = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, &fa);
1732 if (error) {
1733 xfs_trans_cancel(tp);
1734 goto out_drop_write;
1735 }
1736
1737 error = xfs_ioctl_setattr_xflags(tp, ip, &fa);
1738 if (error) {
1739 xfs_trans_cancel(tp);
1740 goto out_drop_write;
1741 }
1742
1743 error = xfs_trans_commit(tp);
1744 out_drop_write:
1745 mnt_drop_write_file(filp);
1746 return error;
1747 }
1748
1749 static bool
xfs_getbmap_format(struct kgetbmap * p,struct getbmapx __user * u,size_t recsize)1750 xfs_getbmap_format(
1751 struct kgetbmap *p,
1752 struct getbmapx __user *u,
1753 size_t recsize)
1754 {
1755 if (put_user(p->bmv_offset, &u->bmv_offset) ||
1756 put_user(p->bmv_block, &u->bmv_block) ||
1757 put_user(p->bmv_length, &u->bmv_length) ||
1758 put_user(0, &u->bmv_count) ||
1759 put_user(0, &u->bmv_entries))
1760 return false;
1761 if (recsize < sizeof(struct getbmapx))
1762 return true;
1763 if (put_user(0, &u->bmv_iflags) ||
1764 put_user(p->bmv_oflags, &u->bmv_oflags) ||
1765 put_user(0, &u->bmv_unused1) ||
1766 put_user(0, &u->bmv_unused2))
1767 return false;
1768 return true;
1769 }
1770
1771 STATIC int
xfs_ioc_getbmap(struct file * file,unsigned int cmd,void __user * arg)1772 xfs_ioc_getbmap(
1773 struct file *file,
1774 unsigned int cmd,
1775 void __user *arg)
1776 {
1777 struct getbmapx bmx = { 0 };
1778 struct kgetbmap *buf;
1779 size_t recsize;
1780 int error, i;
1781
1782 switch (cmd) {
1783 case XFS_IOC_GETBMAPA:
1784 bmx.bmv_iflags = BMV_IF_ATTRFORK;
1785 /*FALLTHRU*/
1786 case XFS_IOC_GETBMAP:
1787 if (file->f_mode & FMODE_NOCMTIME)
1788 bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
1789 /* struct getbmap is a strict subset of struct getbmapx. */
1790 recsize = sizeof(struct getbmap);
1791 break;
1792 case XFS_IOC_GETBMAPX:
1793 recsize = sizeof(struct getbmapx);
1794 break;
1795 default:
1796 return -EINVAL;
1797 }
1798
1799 if (copy_from_user(&bmx, arg, recsize))
1800 return -EFAULT;
1801
1802 if (bmx.bmv_count < 2)
1803 return -EINVAL;
1804 if (bmx.bmv_count > ULONG_MAX / recsize)
1805 return -ENOMEM;
1806
1807 buf = kmem_zalloc_large(bmx.bmv_count * sizeof(*buf), 0);
1808 if (!buf)
1809 return -ENOMEM;
1810
1811 error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, buf);
1812 if (error)
1813 goto out_free_buf;
1814
1815 error = -EFAULT;
1816 if (copy_to_user(arg, &bmx, recsize))
1817 goto out_free_buf;
1818 arg += recsize;
1819
1820 for (i = 0; i < bmx.bmv_entries; i++) {
1821 if (!xfs_getbmap_format(buf + i, arg, recsize))
1822 goto out_free_buf;
1823 arg += recsize;
1824 }
1825
1826 error = 0;
1827 out_free_buf:
1828 kmem_free(buf);
1829 return error;
1830 }
1831
1832 struct getfsmap_info {
1833 struct xfs_mount *mp;
1834 struct fsmap_head __user *data;
1835 unsigned int idx;
1836 __u32 last_flags;
1837 };
1838
1839 STATIC int
xfs_getfsmap_format(struct xfs_fsmap * xfm,void * priv)1840 xfs_getfsmap_format(struct xfs_fsmap *xfm, void *priv)
1841 {
1842 struct getfsmap_info *info = priv;
1843 struct fsmap fm;
1844
1845 trace_xfs_getfsmap_mapping(info->mp, xfm);
1846
1847 info->last_flags = xfm->fmr_flags;
1848 xfs_fsmap_from_internal(&fm, xfm);
1849 if (copy_to_user(&info->data->fmh_recs[info->idx++], &fm,
1850 sizeof(struct fsmap)))
1851 return -EFAULT;
1852
1853 return 0;
1854 }
1855
1856 STATIC int
xfs_ioc_getfsmap(struct xfs_inode * ip,struct fsmap_head __user * arg)1857 xfs_ioc_getfsmap(
1858 struct xfs_inode *ip,
1859 struct fsmap_head __user *arg)
1860 {
1861 struct getfsmap_info info = { NULL };
1862 struct xfs_fsmap_head xhead = {0};
1863 struct fsmap_head head;
1864 bool aborted = false;
1865 int error;
1866
1867 if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
1868 return -EFAULT;
1869 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
1870 memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
1871 sizeof(head.fmh_keys[0].fmr_reserved)) ||
1872 memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
1873 sizeof(head.fmh_keys[1].fmr_reserved)))
1874 return -EINVAL;
1875
1876 xhead.fmh_iflags = head.fmh_iflags;
1877 xhead.fmh_count = head.fmh_count;
1878 xfs_fsmap_to_internal(&xhead.fmh_keys[0], &head.fmh_keys[0]);
1879 xfs_fsmap_to_internal(&xhead.fmh_keys[1], &head.fmh_keys[1]);
1880
1881 trace_xfs_getfsmap_low_key(ip->i_mount, &xhead.fmh_keys[0]);
1882 trace_xfs_getfsmap_high_key(ip->i_mount, &xhead.fmh_keys[1]);
1883
1884 info.mp = ip->i_mount;
1885 info.data = arg;
1886 error = xfs_getfsmap(ip->i_mount, &xhead, xfs_getfsmap_format, &info);
1887 if (error == -ECANCELED) {
1888 error = 0;
1889 aborted = true;
1890 } else if (error)
1891 return error;
1892
1893 /* If we didn't abort, set the "last" flag in the last fmx */
1894 if (!aborted && info.idx) {
1895 info.last_flags |= FMR_OF_LAST;
1896 if (copy_to_user(&info.data->fmh_recs[info.idx - 1].fmr_flags,
1897 &info.last_flags, sizeof(info.last_flags)))
1898 return -EFAULT;
1899 }
1900
1901 /* copy back header */
1902 head.fmh_entries = xhead.fmh_entries;
1903 head.fmh_oflags = xhead.fmh_oflags;
1904 if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
1905 return -EFAULT;
1906
1907 return 0;
1908 }
1909
1910 STATIC int
xfs_ioc_scrub_metadata(struct xfs_inode * ip,void __user * arg)1911 xfs_ioc_scrub_metadata(
1912 struct xfs_inode *ip,
1913 void __user *arg)
1914 {
1915 struct xfs_scrub_metadata scrub;
1916 int error;
1917
1918 if (!capable(CAP_SYS_ADMIN))
1919 return -EPERM;
1920
1921 if (copy_from_user(&scrub, arg, sizeof(scrub)))
1922 return -EFAULT;
1923
1924 error = xfs_scrub_metadata(ip, &scrub);
1925 if (error)
1926 return error;
1927
1928 if (copy_to_user(arg, &scrub, sizeof(scrub)))
1929 return -EFAULT;
1930
1931 return 0;
1932 }
1933
1934 int
xfs_ioc_swapext(xfs_swapext_t * sxp)1935 xfs_ioc_swapext(
1936 xfs_swapext_t *sxp)
1937 {
1938 xfs_inode_t *ip, *tip;
1939 struct fd f, tmp;
1940 int error = 0;
1941
1942 /* Pull information for the target fd */
1943 f = fdget((int)sxp->sx_fdtarget);
1944 if (!f.file) {
1945 error = -EINVAL;
1946 goto out;
1947 }
1948
1949 if (!(f.file->f_mode & FMODE_WRITE) ||
1950 !(f.file->f_mode & FMODE_READ) ||
1951 (f.file->f_flags & O_APPEND)) {
1952 error = -EBADF;
1953 goto out_put_file;
1954 }
1955
1956 tmp = fdget((int)sxp->sx_fdtmp);
1957 if (!tmp.file) {
1958 error = -EINVAL;
1959 goto out_put_file;
1960 }
1961
1962 if (!(tmp.file->f_mode & FMODE_WRITE) ||
1963 !(tmp.file->f_mode & FMODE_READ) ||
1964 (tmp.file->f_flags & O_APPEND)) {
1965 error = -EBADF;
1966 goto out_put_tmp_file;
1967 }
1968
1969 if (IS_SWAPFILE(file_inode(f.file)) ||
1970 IS_SWAPFILE(file_inode(tmp.file))) {
1971 error = -EINVAL;
1972 goto out_put_tmp_file;
1973 }
1974
1975 /*
1976 * We need to ensure that the fds passed in point to XFS inodes
1977 * before we cast and access them as XFS structures as we have no
1978 * control over what the user passes us here.
1979 */
1980 if (f.file->f_op != &xfs_file_operations ||
1981 tmp.file->f_op != &xfs_file_operations) {
1982 error = -EINVAL;
1983 goto out_put_tmp_file;
1984 }
1985
1986 ip = XFS_I(file_inode(f.file));
1987 tip = XFS_I(file_inode(tmp.file));
1988
1989 if (ip->i_mount != tip->i_mount) {
1990 error = -EINVAL;
1991 goto out_put_tmp_file;
1992 }
1993
1994 if (ip->i_ino == tip->i_ino) {
1995 error = -EINVAL;
1996 goto out_put_tmp_file;
1997 }
1998
1999 if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
2000 error = -EIO;
2001 goto out_put_tmp_file;
2002 }
2003
2004 error = xfs_swap_extents(ip, tip, sxp);
2005
2006 out_put_tmp_file:
2007 fdput(tmp);
2008 out_put_file:
2009 fdput(f);
2010 out:
2011 return error;
2012 }
2013
2014 static int
xfs_ioc_getlabel(struct xfs_mount * mp,char __user * user_label)2015 xfs_ioc_getlabel(
2016 struct xfs_mount *mp,
2017 char __user *user_label)
2018 {
2019 struct xfs_sb *sbp = &mp->m_sb;
2020 char label[XFSLABEL_MAX + 1];
2021
2022 /* Paranoia */
2023 BUILD_BUG_ON(sizeof(sbp->sb_fname) > FSLABEL_MAX);
2024
2025 /* 1 larger than sb_fname, so this ensures a trailing NUL char */
2026 memset(label, 0, sizeof(label));
2027 spin_lock(&mp->m_sb_lock);
2028 strncpy(label, sbp->sb_fname, XFSLABEL_MAX);
2029 spin_unlock(&mp->m_sb_lock);
2030
2031 if (copy_to_user(user_label, label, sizeof(label)))
2032 return -EFAULT;
2033 return 0;
2034 }
2035
2036 static int
xfs_ioc_setlabel(struct file * filp,struct xfs_mount * mp,char __user * newlabel)2037 xfs_ioc_setlabel(
2038 struct file *filp,
2039 struct xfs_mount *mp,
2040 char __user *newlabel)
2041 {
2042 struct xfs_sb *sbp = &mp->m_sb;
2043 char label[XFSLABEL_MAX + 1];
2044 size_t len;
2045 int error;
2046
2047 if (!capable(CAP_SYS_ADMIN))
2048 return -EPERM;
2049 /*
2050 * The generic ioctl allows up to FSLABEL_MAX chars, but XFS is much
2051 * smaller, at 12 bytes. We copy one more to be sure we find the
2052 * (required) NULL character to test the incoming label length.
2053 * NB: The on disk label doesn't need to be null terminated.
2054 */
2055 if (copy_from_user(label, newlabel, XFSLABEL_MAX + 1))
2056 return -EFAULT;
2057 len = strnlen(label, XFSLABEL_MAX + 1);
2058 if (len > sizeof(sbp->sb_fname))
2059 return -EINVAL;
2060
2061 error = mnt_want_write_file(filp);
2062 if (error)
2063 return error;
2064
2065 spin_lock(&mp->m_sb_lock);
2066 memset(sbp->sb_fname, 0, sizeof(sbp->sb_fname));
2067 memcpy(sbp->sb_fname, label, len);
2068 spin_unlock(&mp->m_sb_lock);
2069
2070 /*
2071 * Now we do several things to satisfy userspace.
2072 * In addition to normal logging of the primary superblock, we also
2073 * immediately write these changes to sector zero for the primary, then
2074 * update all backup supers (as xfs_db does for a label change), then
2075 * invalidate the block device page cache. This is so that any prior
2076 * buffered reads from userspace (i.e. from blkid) are invalidated,
2077 * and userspace will see the newly-written label.
2078 */
2079 error = xfs_sync_sb_buf(mp);
2080 if (error)
2081 goto out;
2082 /*
2083 * growfs also updates backup supers so lock against that.
2084 */
2085 mutex_lock(&mp->m_growlock);
2086 error = xfs_update_secondary_sbs(mp);
2087 mutex_unlock(&mp->m_growlock);
2088
2089 invalidate_bdev(mp->m_ddev_targp->bt_bdev);
2090
2091 out:
2092 mnt_drop_write_file(filp);
2093 return error;
2094 }
2095
2096 /*
2097 * Note: some of the ioctl's return positive numbers as a
2098 * byte count indicating success, such as readlink_by_handle.
2099 * So we don't "sign flip" like most other routines. This means
2100 * true errors need to be returned as a negative value.
2101 */
2102 long
xfs_file_ioctl(struct file * filp,unsigned int cmd,unsigned long p)2103 xfs_file_ioctl(
2104 struct file *filp,
2105 unsigned int cmd,
2106 unsigned long p)
2107 {
2108 struct inode *inode = file_inode(filp);
2109 struct xfs_inode *ip = XFS_I(inode);
2110 struct xfs_mount *mp = ip->i_mount;
2111 void __user *arg = (void __user *)p;
2112 int error;
2113
2114 trace_xfs_file_ioctl(ip);
2115
2116 switch (cmd) {
2117 case FITRIM:
2118 return xfs_ioc_trim(mp, arg);
2119 case FS_IOC_GETFSLABEL:
2120 return xfs_ioc_getlabel(mp, arg);
2121 case FS_IOC_SETFSLABEL:
2122 return xfs_ioc_setlabel(filp, mp, arg);
2123 case XFS_IOC_ALLOCSP:
2124 case XFS_IOC_FREESP:
2125 case XFS_IOC_RESVSP:
2126 case XFS_IOC_UNRESVSP:
2127 case XFS_IOC_ALLOCSP64:
2128 case XFS_IOC_FREESP64:
2129 case XFS_IOC_RESVSP64:
2130 case XFS_IOC_UNRESVSP64:
2131 case XFS_IOC_ZERO_RANGE: {
2132 xfs_flock64_t bf;
2133
2134 if (copy_from_user(&bf, arg, sizeof(bf)))
2135 return -EFAULT;
2136 return xfs_ioc_space(filp, cmd, &bf);
2137 }
2138 case XFS_IOC_DIOINFO: {
2139 struct dioattr da;
2140 xfs_buftarg_t *target =
2141 XFS_IS_REALTIME_INODE(ip) ?
2142 mp->m_rtdev_targp : mp->m_ddev_targp;
2143
2144 da.d_mem = da.d_miniosz = target->bt_logical_sectorsize;
2145 da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
2146
2147 if (copy_to_user(arg, &da, sizeof(da)))
2148 return -EFAULT;
2149 return 0;
2150 }
2151
2152 case XFS_IOC_FSBULKSTAT_SINGLE:
2153 case XFS_IOC_FSBULKSTAT:
2154 case XFS_IOC_FSINUMBERS:
2155 return xfs_ioc_fsbulkstat(mp, cmd, arg);
2156
2157 case XFS_IOC_BULKSTAT:
2158 return xfs_ioc_bulkstat(mp, cmd, arg);
2159 case XFS_IOC_INUMBERS:
2160 return xfs_ioc_inumbers(mp, cmd, arg);
2161
2162 case XFS_IOC_FSGEOMETRY_V1:
2163 return xfs_ioc_fsgeometry(mp, arg, 3);
2164 case XFS_IOC_FSGEOMETRY_V4:
2165 return xfs_ioc_fsgeometry(mp, arg, 4);
2166 case XFS_IOC_FSGEOMETRY:
2167 return xfs_ioc_fsgeometry(mp, arg, 5);
2168
2169 case XFS_IOC_AG_GEOMETRY:
2170 return xfs_ioc_ag_geometry(mp, arg);
2171
2172 case XFS_IOC_GETVERSION:
2173 return put_user(inode->i_generation, (int __user *)arg);
2174
2175 case XFS_IOC_FSGETXATTR:
2176 return xfs_ioc_fsgetxattr(ip, 0, arg);
2177 case XFS_IOC_FSGETXATTRA:
2178 return xfs_ioc_fsgetxattr(ip, 1, arg);
2179 case XFS_IOC_FSSETXATTR:
2180 return xfs_ioc_fssetxattr(ip, filp, arg);
2181 case XFS_IOC_GETXFLAGS:
2182 return xfs_ioc_getxflags(ip, arg);
2183 case XFS_IOC_SETXFLAGS:
2184 return xfs_ioc_setxflags(ip, filp, arg);
2185
2186 case XFS_IOC_FSSETDM: {
2187 struct fsdmidata dmi;
2188
2189 if (copy_from_user(&dmi, arg, sizeof(dmi)))
2190 return -EFAULT;
2191
2192 error = mnt_want_write_file(filp);
2193 if (error)
2194 return error;
2195
2196 error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
2197 dmi.fsd_dmstate);
2198 mnt_drop_write_file(filp);
2199 return error;
2200 }
2201
2202 case XFS_IOC_GETBMAP:
2203 case XFS_IOC_GETBMAPA:
2204 case XFS_IOC_GETBMAPX:
2205 return xfs_ioc_getbmap(filp, cmd, arg);
2206
2207 case FS_IOC_GETFSMAP:
2208 return xfs_ioc_getfsmap(ip, arg);
2209
2210 case XFS_IOC_SCRUB_METADATA:
2211 return xfs_ioc_scrub_metadata(ip, arg);
2212
2213 case XFS_IOC_FD_TO_HANDLE:
2214 case XFS_IOC_PATH_TO_HANDLE:
2215 case XFS_IOC_PATH_TO_FSHANDLE: {
2216 xfs_fsop_handlereq_t hreq;
2217
2218 if (copy_from_user(&hreq, arg, sizeof(hreq)))
2219 return -EFAULT;
2220 return xfs_find_handle(cmd, &hreq);
2221 }
2222 case XFS_IOC_OPEN_BY_HANDLE: {
2223 xfs_fsop_handlereq_t hreq;
2224
2225 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
2226 return -EFAULT;
2227 return xfs_open_by_handle(filp, &hreq);
2228 }
2229 case XFS_IOC_FSSETDM_BY_HANDLE:
2230 return xfs_fssetdm_by_handle(filp, arg);
2231
2232 case XFS_IOC_READLINK_BY_HANDLE: {
2233 xfs_fsop_handlereq_t hreq;
2234
2235 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
2236 return -EFAULT;
2237 return xfs_readlink_by_handle(filp, &hreq);
2238 }
2239 case XFS_IOC_ATTRLIST_BY_HANDLE:
2240 return xfs_attrlist_by_handle(filp, arg);
2241
2242 case XFS_IOC_ATTRMULTI_BY_HANDLE:
2243 return xfs_attrmulti_by_handle(filp, arg);
2244
2245 case XFS_IOC_SWAPEXT: {
2246 struct xfs_swapext sxp;
2247
2248 if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
2249 return -EFAULT;
2250 error = mnt_want_write_file(filp);
2251 if (error)
2252 return error;
2253 error = xfs_ioc_swapext(&sxp);
2254 mnt_drop_write_file(filp);
2255 return error;
2256 }
2257
2258 case XFS_IOC_FSCOUNTS: {
2259 xfs_fsop_counts_t out;
2260
2261 xfs_fs_counts(mp, &out);
2262
2263 if (copy_to_user(arg, &out, sizeof(out)))
2264 return -EFAULT;
2265 return 0;
2266 }
2267
2268 case XFS_IOC_SET_RESBLKS: {
2269 xfs_fsop_resblks_t inout;
2270 uint64_t in;
2271
2272 if (!capable(CAP_SYS_ADMIN))
2273 return -EPERM;
2274
2275 if (mp->m_flags & XFS_MOUNT_RDONLY)
2276 return -EROFS;
2277
2278 if (copy_from_user(&inout, arg, sizeof(inout)))
2279 return -EFAULT;
2280
2281 error = mnt_want_write_file(filp);
2282 if (error)
2283 return error;
2284
2285 /* input parameter is passed in resblks field of structure */
2286 in = inout.resblks;
2287 error = xfs_reserve_blocks(mp, &in, &inout);
2288 mnt_drop_write_file(filp);
2289 if (error)
2290 return error;
2291
2292 if (copy_to_user(arg, &inout, sizeof(inout)))
2293 return -EFAULT;
2294 return 0;
2295 }
2296
2297 case XFS_IOC_GET_RESBLKS: {
2298 xfs_fsop_resblks_t out;
2299
2300 if (!capable(CAP_SYS_ADMIN))
2301 return -EPERM;
2302
2303 error = xfs_reserve_blocks(mp, NULL, &out);
2304 if (error)
2305 return error;
2306
2307 if (copy_to_user(arg, &out, sizeof(out)))
2308 return -EFAULT;
2309
2310 return 0;
2311 }
2312
2313 case XFS_IOC_FSGROWFSDATA: {
2314 xfs_growfs_data_t in;
2315
2316 if (copy_from_user(&in, arg, sizeof(in)))
2317 return -EFAULT;
2318
2319 error = mnt_want_write_file(filp);
2320 if (error)
2321 return error;
2322 error = xfs_growfs_data(mp, &in);
2323 mnt_drop_write_file(filp);
2324 return error;
2325 }
2326
2327 case XFS_IOC_FSGROWFSLOG: {
2328 xfs_growfs_log_t in;
2329
2330 if (copy_from_user(&in, arg, sizeof(in)))
2331 return -EFAULT;
2332
2333 error = mnt_want_write_file(filp);
2334 if (error)
2335 return error;
2336 error = xfs_growfs_log(mp, &in);
2337 mnt_drop_write_file(filp);
2338 return error;
2339 }
2340
2341 case XFS_IOC_FSGROWFSRT: {
2342 xfs_growfs_rt_t in;
2343
2344 if (copy_from_user(&in, arg, sizeof(in)))
2345 return -EFAULT;
2346
2347 error = mnt_want_write_file(filp);
2348 if (error)
2349 return error;
2350 error = xfs_growfs_rt(mp, &in);
2351 mnt_drop_write_file(filp);
2352 return error;
2353 }
2354
2355 case XFS_IOC_GOINGDOWN: {
2356 uint32_t in;
2357
2358 if (!capable(CAP_SYS_ADMIN))
2359 return -EPERM;
2360
2361 if (get_user(in, (uint32_t __user *)arg))
2362 return -EFAULT;
2363
2364 return xfs_fs_goingdown(mp, in);
2365 }
2366
2367 case XFS_IOC_ERROR_INJECTION: {
2368 xfs_error_injection_t in;
2369
2370 if (!capable(CAP_SYS_ADMIN))
2371 return -EPERM;
2372
2373 if (copy_from_user(&in, arg, sizeof(in)))
2374 return -EFAULT;
2375
2376 return xfs_errortag_add(mp, in.errtag);
2377 }
2378
2379 case XFS_IOC_ERROR_CLEARALL:
2380 if (!capable(CAP_SYS_ADMIN))
2381 return -EPERM;
2382
2383 return xfs_errortag_clearall(mp);
2384
2385 case XFS_IOC_FREE_EOFBLOCKS: {
2386 struct xfs_fs_eofblocks eofb;
2387 struct xfs_eofblocks keofb;
2388
2389 if (!capable(CAP_SYS_ADMIN))
2390 return -EPERM;
2391
2392 if (mp->m_flags & XFS_MOUNT_RDONLY)
2393 return -EROFS;
2394
2395 if (copy_from_user(&eofb, arg, sizeof(eofb)))
2396 return -EFAULT;
2397
2398 error = xfs_fs_eofblocks_from_user(&eofb, &keofb);
2399 if (error)
2400 return error;
2401
2402 return xfs_icache_free_eofblocks(mp, &keofb);
2403 }
2404
2405 default:
2406 return -ENOTTY;
2407 }
2408 }
2409