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[PATCH] move capable() to capability.h
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / linux-2.6 / xfs_ioctl.c
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1da177e4 1/*
7b718769
NS		 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
1da177e4 4 *
7b718769
NS		 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
1da177e4
LT		 7 * published by the Free Software Foundation.
8 *
7b718769
NS		 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.
1da177e4 13 *
7b718769
NS		 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
1da177e4 17 */
1da177e4 18#include "xfs.h"
1da177e4 19#include "xfs_fs.h"
a844f451 20#include "xfs_bit.h"
1da177e4 21#include "xfs_log.h"
a844f451 22#include "xfs_inum.h"
1da177e4
LT		 23#include "xfs_trans.h"
24#include "xfs_sb.h"
a844f451 25#include "xfs_ag.h"
1da177e4
LT		 26#include "xfs_dir.h"
27#include "xfs_dir2.h"
28#include "xfs_alloc.h"
29#include "xfs_dmapi.h"
30#include "xfs_mount.h"
1da177e4 31#include "xfs_bmap_btree.h"
a844f451 32#include "xfs_alloc_btree.h"
1da177e4 33#include "xfs_ialloc_btree.h"
1da177e4 34#include "xfs_dir_sf.h"
a844f451 35#include "xfs_attr_sf.h"
1da177e4
LT		 36#include "xfs_dir2_sf.h"
37#include "xfs_dinode.h"
38#include "xfs_inode.h"
a844f451
NS		 39#include "xfs_btree.h"
40#include "xfs_ialloc.h"
1da177e4 41#include "xfs_rtalloc.h"
1da177e4 42#include "xfs_itable.h"
a844f451 43#include "xfs_error.h"
1da177e4
LT		 44#include "xfs_rw.h"
45#include "xfs_acl.h"
46#include "xfs_cap.h"
47#include "xfs_mac.h"
48#include "xfs_attr.h"
a844f451 49#include "xfs_bmap.h"
1da177e4
LT		 50#include "xfs_buf_item.h"
51#include "xfs_utils.h"
52#include "xfs_dfrag.h"
53#include "xfs_fsops.h"
54
55#include <linux/dcache.h>
56#include <linux/mount.h>
57#include <linux/namei.h>
58#include <linux/pagemap.h>
59
60/*
61 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
62 * a file or fs handle.
63 *
64 * XFS_IOC_PATH_TO_FSHANDLE
65 * returns fs handle for a mount point or path within that mount point
66 * XFS_IOC_FD_TO_HANDLE
67 * returns full handle for a FD opened in user space
68 * XFS_IOC_PATH_TO_HANDLE
69 * returns full handle for a path
70 */
71STATIC int
72xfs_find_handle(
73 unsigned int cmd,
74 void __user *arg)
75{
76 int hsize;
77 xfs_handle_t handle;
78 xfs_fsop_handlereq_t hreq;
79 struct inode *inode;
80 struct vnode *vp;
81
82 if (copy_from_user(&hreq, arg, sizeof(hreq)))
83 return -XFS_ERROR(EFAULT);
84
85 memset((char *)&handle, 0, sizeof(handle));
86
87 switch (cmd) {
88 case XFS_IOC_PATH_TO_FSHANDLE:
89 case XFS_IOC_PATH_TO_HANDLE: {
90 struct nameidata nd;
91 int error;
92
93 error = user_path_walk_link((const char __user *)hreq.path, &nd);
94 if (error)
95 return error;
96
97 ASSERT(nd.dentry);
98 ASSERT(nd.dentry->d_inode);
99 inode = igrab(nd.dentry->d_inode);
100 path_release(&nd);
101 break;
102 }
103
104 case XFS_IOC_FD_TO_HANDLE: {
105 struct file *file;
106
107 file = fget(hreq.fd);
108 if (!file)
109 return -EBADF;
110
111 ASSERT(file->f_dentry);
112 ASSERT(file->f_dentry->d_inode);
113 inode = igrab(file->f_dentry->d_inode);
114 fput(file);
115 break;
116 }
117
118 default:
119 ASSERT(0);
120 return -XFS_ERROR(EINVAL);
121 }
122
123 if (inode->i_sb->s_magic != XFS_SB_MAGIC) {
124 /* we're not in XFS anymore, Toto */
125 iput(inode);
126 return -XFS_ERROR(EINVAL);
127 }
128
0432dab2
CH		 129 switch (inode->i_mode & S_IFMT) {
130 case S_IFREG:
131 case S_IFDIR:
132 case S_IFLNK:
133 break;
134 default:
1da177e4
LT		 135 iput(inode);
136 return -XFS_ERROR(EBADF);
137 }
138
0432dab2
CH		 139 /* we need the vnode */
140 vp = LINVFS_GET_VP(inode);
141
1da177e4
LT		 142 /* now we can grab the fsid */
143 memcpy(&handle.ha_fsid, vp->v_vfsp->vfs_altfsid, sizeof(xfs_fsid_t));
144 hsize = sizeof(xfs_fsid_t);
145
146 if (cmd != XFS_IOC_PATH_TO_FSHANDLE) {
147 xfs_inode_t *ip;
148 bhv_desc_t *bhv;
149 int lock_mode;
150
151 /* need to get access to the xfs_inode to read the generation */
152 bhv = vn_bhv_lookup_unlocked(VN_BHV_HEAD(vp), &xfs_vnodeops);
153 ASSERT(bhv);
154 ip = XFS_BHVTOI(bhv);
155 ASSERT(ip);
156 lock_mode = xfs_ilock_map_shared(ip);
157
158 /* fill in fid section of handle from inode */
159 handle.ha_fid.xfs_fid_len = sizeof(xfs_fid_t) -
160 sizeof(handle.ha_fid.xfs_fid_len);
161 handle.ha_fid.xfs_fid_pad = 0;
162 handle.ha_fid.xfs_fid_gen = ip->i_d.di_gen;
163 handle.ha_fid.xfs_fid_ino = ip->i_ino;
164
165 xfs_iunlock_map_shared(ip, lock_mode);
166
167 hsize = XFS_HSIZE(handle);
168 }
169
170 /* now copy our handle into the user buffer & write out the size */
171 if (copy_to_user(hreq.ohandle, &handle, hsize) ||
172 copy_to_user(hreq.ohandlen, &hsize, sizeof(__s32))) {
173 iput(inode);
174 return -XFS_ERROR(EFAULT);
175 }
176
177 iput(inode);
178 return 0;
179}
180
181
182/*
183 * Convert userspace handle data into vnode (and inode).
184 * We [ab]use the fact that all the fsop_handlereq ioctl calls
185 * have a data structure argument whose first component is always
186 * a xfs_fsop_handlereq_t, so we can cast to and from this type.
187 * This allows us to optimise the copy_from_user calls and gives
188 * a handy, shared routine.
189 *
190 * If no error, caller must always VN_RELE the returned vp.
191 */
192STATIC int
193xfs_vget_fsop_handlereq(
194 xfs_mount_t *mp,
195 struct inode *parinode, /* parent inode pointer */
196 xfs_fsop_handlereq_t *hreq,
197 vnode_t **vp,
198 struct inode **inode)
199{
200 void __user *hanp;
201 size_t hlen;
202 xfs_fid_t *xfid;
203 xfs_handle_t *handlep;
204 xfs_handle_t handle;
205 xfs_inode_t *ip;
206 struct inode *inodep;
207 vnode_t *vpp;
208 xfs_ino_t ino;
209 __u32 igen;
210 int error;
211
212 /*
213 * Only allow handle opens under a directory.
214 */
215 if (!S_ISDIR(parinode->i_mode))
216 return XFS_ERROR(ENOTDIR);
217
218 hanp = hreq->ihandle;
219 hlen = hreq->ihandlen;
220 handlep = &handle;
221
222 if (hlen < sizeof(handlep->ha_fsid) || hlen > sizeof(*handlep))
223 return XFS_ERROR(EINVAL);
224 if (copy_from_user(handlep, hanp, hlen))
225 return XFS_ERROR(EFAULT);
226 if (hlen < sizeof(*handlep))
227 memset(((char *)handlep) + hlen, 0, sizeof(*handlep) - hlen);
228 if (hlen > sizeof(handlep->ha_fsid)) {
229 if (handlep->ha_fid.xfs_fid_len !=
230 (hlen - sizeof(handlep->ha_fsid)
231 - sizeof(handlep->ha_fid.xfs_fid_len))
232 || handlep->ha_fid.xfs_fid_pad)
233 return XFS_ERROR(EINVAL);
234 }
235
236 /*
237 * Crack the handle, obtain the inode # & generation #
238 */
239 xfid = (struct xfs_fid *)&handlep->ha_fid;
240 if (xfid->xfs_fid_len == sizeof(*xfid) - sizeof(xfid->xfs_fid_len)) {
241 ino = xfid->xfs_fid_ino;
242 igen = xfid->xfs_fid_gen;
243 } else {
244 return XFS_ERROR(EINVAL);
245 }
246
247 /*
248 * Get the XFS inode, building a vnode to go with it.
249 */
250 error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
251 if (error)
252 return error;
253 if (ip == NULL)
254 return XFS_ERROR(EIO);
255 if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
256 xfs_iput_new(ip, XFS_ILOCK_SHARED);
257 return XFS_ERROR(ENOENT);
258 }
259
260 vpp = XFS_ITOV(ip);
261 inodep = LINVFS_GET_IP(vpp);
262 xfs_iunlock(ip, XFS_ILOCK_SHARED);
263
264 *vp = vpp;
265 *inode = inodep;
266 return 0;
267}
268
269STATIC int
270xfs_open_by_handle(
271 xfs_mount_t *mp,
272 void __user *arg,
273 struct file *parfilp,
274 struct inode *parinode)
275{
276 int error;
277 int new_fd;
278 int permflag;
279 struct file *filp;
280 struct inode *inode;
281 struct dentry *dentry;
282 vnode_t *vp;
283 xfs_fsop_handlereq_t hreq;
284
285 if (!capable(CAP_SYS_ADMIN))
286 return -XFS_ERROR(EPERM);
287 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
288 return -XFS_ERROR(EFAULT);
289
290 error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &vp, &inode);
291 if (error)
292 return -error;
293
294 /* Restrict xfs_open_by_handle to directories & regular files. */
295 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
296 iput(inode);
297 return -XFS_ERROR(EINVAL);
298 }
299
300#if BITS_PER_LONG != 32
301 hreq.oflags |= O_LARGEFILE;
302#endif
303 /* Put open permission in namei format. */
304 permflag = hreq.oflags;
305 if ((permflag+1) & O_ACCMODE)
306 permflag++;
307 if (permflag & O_TRUNC)
308 permflag |= 2;
309
310 if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
311 (permflag & FMODE_WRITE) && IS_APPEND(inode)) {
312 iput(inode);
313 return -XFS_ERROR(EPERM);
314 }
315
316 if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
317 iput(inode);
318 return -XFS_ERROR(EACCES);
319 }
320
321 /* Can't write directories. */
322 if ( S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
323 iput(inode);
324 return -XFS_ERROR(EISDIR);
325 }
326
327 if ((new_fd = get_unused_fd()) < 0) {
328 iput(inode);
329 return new_fd;
330 }
331
332 dentry = d_alloc_anon(inode);
333 if (dentry == NULL) {
334 iput(inode);
335 put_unused_fd(new_fd);
336 return -XFS_ERROR(ENOMEM);
337 }
338
339 /* Ensure umount returns EBUSY on umounts while this file is open. */
340 mntget(parfilp->f_vfsmnt);
341
342 /* Create file pointer. */
343 filp = dentry_open(dentry, parfilp->f_vfsmnt, hreq.oflags);
344 if (IS_ERR(filp)) {
345 put_unused_fd(new_fd);
346 return -XFS_ERROR(-PTR_ERR(filp));
347 }
348 if (inode->i_mode & S_IFREG)
349 filp->f_op = &linvfs_invis_file_operations;
350
351 fd_install(new_fd, filp);
352 return new_fd;
353}
354
355STATIC int
356xfs_readlink_by_handle(
357 xfs_mount_t *mp,
358 void __user *arg,
359 struct file *parfilp,
360 struct inode *parinode)
361{
362 int error;
363 struct iovec aiov;
364 struct uio auio;
365 struct inode *inode;
366 xfs_fsop_handlereq_t hreq;
367 vnode_t *vp;
368 __u32 olen;
369
370 if (!capable(CAP_SYS_ADMIN))
371 return -XFS_ERROR(EPERM);
372 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
373 return -XFS_ERROR(EFAULT);
374
375 error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &vp, &inode);
376 if (error)
377 return -error;
378
379 /* Restrict this handle operation to symlinks only. */
0432dab2 380 if (!S_ISLNK(inode->i_mode)) {
1da177e4
LT		 381 VN_RELE(vp);
382 return -XFS_ERROR(EINVAL);
383 }
384
385 if (copy_from_user(&olen, hreq.ohandlen, sizeof(__u32))) {
386 VN_RELE(vp);
387 return -XFS_ERROR(EFAULT);
388 }
389 aiov.iov_len = olen;
390 aiov.iov_base = hreq.ohandle;
391
392 auio.uio_iov = &aiov;
393 auio.uio_iovcnt = 1;
394 auio.uio_offset = 0;
395 auio.uio_segflg = UIO_USERSPACE;
396 auio.uio_resid = olen;
397
398 VOP_READLINK(vp, &auio, IO_INVIS, NULL, error);
399
400 VN_RELE(vp);
401 return (olen - auio.uio_resid);
402}
403
404STATIC int
405xfs_fssetdm_by_handle(
406 xfs_mount_t *mp,
407 void __user *arg,
408 struct file *parfilp,
409 struct inode *parinode)
410{
411 int error;
412 struct fsdmidata fsd;
413 xfs_fsop_setdm_handlereq_t dmhreq;
414 struct inode *inode;
415 bhv_desc_t *bdp;
416 vnode_t *vp;
417
418 if (!capable(CAP_MKNOD))
419 return -XFS_ERROR(EPERM);
420 if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
421 return -XFS_ERROR(EFAULT);
422
423 error = xfs_vget_fsop_handlereq(mp, parinode, &dmhreq.hreq, &vp, &inode);
424 if (error)
425 return -error;
426
427 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
428 VN_RELE(vp);
429 return -XFS_ERROR(EPERM);
430 }
431
432 if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
433 VN_RELE(vp);
434 return -XFS_ERROR(EFAULT);
435 }
436
437 bdp = bhv_base_unlocked(VN_BHV_HEAD(vp));
438 error = xfs_set_dmattrs(bdp, fsd.fsd_dmevmask, fsd.fsd_dmstate, NULL);
439
440 VN_RELE(vp);
441 if (error)
442 return -error;
443 return 0;
444}
445
446STATIC int
447xfs_attrlist_by_handle(
448 xfs_mount_t *mp,
449 void __user *arg,
450 struct file *parfilp,
451 struct inode *parinode)
452{
453 int error;
454 attrlist_cursor_kern_t *cursor;
455 xfs_fsop_attrlist_handlereq_t al_hreq;
456 struct inode *inode;
457 vnode_t *vp;
458 char *kbuf;
459
460 if (!capable(CAP_SYS_ADMIN))
461 return -XFS_ERROR(EPERM);
462 if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
463 return -XFS_ERROR(EFAULT);
464 if (al_hreq.buflen > XATTR_LIST_MAX)
465 return -XFS_ERROR(EINVAL);
466
467 error = xfs_vget_fsop_handlereq(mp, parinode, &al_hreq.hreq,
468 &vp, &inode);
469 if (error)
470 goto out;
471
472 kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
473 if (!kbuf)
474 goto out_vn_rele;
475
476 cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
477 VOP_ATTR_LIST(vp, kbuf, al_hreq.buflen, al_hreq.flags,
478 cursor, NULL, error);
479 if (error)
480 goto out_kfree;
481
482 if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
483 error = -EFAULT;
484
485 out_kfree:
486 kfree(kbuf);
487 out_vn_rele:
488 VN_RELE(vp);
489 out:
490 return -error;
491}
492
493STATIC int
494xfs_attrmulti_attr_get(
495 struct vnode *vp,
496 char *name,
497 char __user *ubuf,
498 __uint32_t *len,
499 __uint32_t flags)
500{
501 char *kbuf;
502 int error = EFAULT;
503
504 if (*len > XATTR_SIZE_MAX)
505 return EINVAL;
506 kbuf = kmalloc(*len, GFP_KERNEL);
507 if (!kbuf)
508 return ENOMEM;
509
510 VOP_ATTR_GET(vp, name, kbuf, len, flags, NULL, error);
511 if (error)
512 goto out_kfree;
513
514 if (copy_to_user(ubuf, kbuf, *len))
515 error = EFAULT;
516
517 out_kfree:
518 kfree(kbuf);
519 return error;
520}
521
522STATIC int
523xfs_attrmulti_attr_set(
524 struct vnode *vp,
525 char *name,
526 const char __user *ubuf,
527 __uint32_t len,
528 __uint32_t flags)
529{
530 char *kbuf;
531 int error = EFAULT;
532
3542c6e1
CH		 533 if (IS_RDONLY(&vp->v_inode))
534 return -EROFS;
1da177e4
LT		 535 if (IS_IMMUTABLE(&vp->v_inode) || IS_APPEND(&vp->v_inode))
536 return EPERM;
537 if (len > XATTR_SIZE_MAX)
538 return EINVAL;
539
540 kbuf = kmalloc(len, GFP_KERNEL);
541 if (!kbuf)
542 return ENOMEM;
543
544 if (copy_from_user(kbuf, ubuf, len))
545 goto out_kfree;
546
547 VOP_ATTR_SET(vp, name, kbuf, len, flags, NULL, error);
548
549 out_kfree:
550 kfree(kbuf);
551 return error;
552}
553
554STATIC int
555xfs_attrmulti_attr_remove(
556 struct vnode *vp,
557 char *name,
558 __uint32_t flags)
559{
560 int error;
561
3542c6e1
CH		 562
563 if (IS_RDONLY(&vp->v_inode))
564 return -EROFS;
1da177e4
LT		 565 if (IS_IMMUTABLE(&vp->v_inode) || IS_APPEND(&vp->v_inode))
566 return EPERM;
567
568 VOP_ATTR_REMOVE(vp, name, flags, NULL, error);
569 return error;
570}
571
572STATIC int
573xfs_attrmulti_by_handle(
574 xfs_mount_t *mp,
575 void __user *arg,
576 struct file *parfilp,
577 struct inode *parinode)
578{
579 int error;
580 xfs_attr_multiop_t *ops;
581 xfs_fsop_attrmulti_handlereq_t am_hreq;
582 struct inode *inode;
583 vnode_t *vp;
584 unsigned int i, size;
585 char *attr_name;
586
587 if (!capable(CAP_SYS_ADMIN))
588 return -XFS_ERROR(EPERM);
589 if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
590 return -XFS_ERROR(EFAULT);
591
592 error = xfs_vget_fsop_handlereq(mp, parinode, &am_hreq.hreq, &vp, &inode);
593 if (error)
594 goto out;
595
596 error = E2BIG;
597 size = am_hreq.opcount * sizeof(attr_multiop_t);
598 if (!size || size > 16 * PAGE_SIZE)
599 goto out_vn_rele;
600
601 error = ENOMEM;
602 ops = kmalloc(size, GFP_KERNEL);
603 if (!ops)
604 goto out_vn_rele;
605
606 error = EFAULT;
607 if (copy_from_user(ops, am_hreq.ops, size))
608 goto out_kfree_ops;
609
610 attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
611 if (!attr_name)
612 goto out_kfree_ops;
613
614
615 error = 0;
616 for (i = 0; i < am_hreq.opcount; i++) {
617 ops[i].am_error = strncpy_from_user(attr_name,
618 ops[i].am_attrname, MAXNAMELEN);
619 if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
620 error = -ERANGE;
621 if (ops[i].am_error < 0)
622 break;
623
624 switch (ops[i].am_opcode) {
625 case ATTR_OP_GET:
626 ops[i].am_error = xfs_attrmulti_attr_get(vp,
627 attr_name, ops[i].am_attrvalue,
628 &ops[i].am_length, ops[i].am_flags);
629 break;
630 case ATTR_OP_SET:
631 ops[i].am_error = xfs_attrmulti_attr_set(vp,
632 attr_name, ops[i].am_attrvalue,
633 ops[i].am_length, ops[i].am_flags);
634 break;
635 case ATTR_OP_REMOVE:
636 ops[i].am_error = xfs_attrmulti_attr_remove(vp,
637 attr_name, ops[i].am_flags);
638 break;
639 default:
640 ops[i].am_error = EINVAL;
641 }
642 }
643
644 if (copy_to_user(am_hreq.ops, ops, size))
645 error = XFS_ERROR(EFAULT);
646
647 kfree(attr_name);
648 out_kfree_ops:
649 kfree(ops);
650 out_vn_rele:
651 VN_RELE(vp);
652 out:
653 return -error;
654}
655
656/* prototypes for a few of the stack-hungry cases that have
657 * their own functions. Functions are defined after their use
658 * so gcc doesn't get fancy and inline them with -03 */
659
660STATIC int
661xfs_ioc_space(
662 bhv_desc_t *bdp,
663 vnode_t *vp,
664 struct file *filp,
665 int flags,
666 unsigned int cmd,
667 void __user *arg);
668
669STATIC int
670xfs_ioc_bulkstat(
671 xfs_mount_t *mp,
672 unsigned int cmd,
673 void __user *arg);
674
675STATIC int
676xfs_ioc_fsgeometry_v1(
677 xfs_mount_t *mp,
678 void __user *arg);
679
680STATIC int
681xfs_ioc_fsgeometry(
682 xfs_mount_t *mp,
683 void __user *arg);
684
685STATIC int
686xfs_ioc_xattr(
687 vnode_t *vp,
688 xfs_inode_t *ip,
689 struct file *filp,
690 unsigned int cmd,
691 void __user *arg);
692
693STATIC int
694xfs_ioc_getbmap(
695 bhv_desc_t *bdp,
696 struct file *filp,
697 int flags,
698 unsigned int cmd,
699 void __user *arg);
700
701STATIC int
702xfs_ioc_getbmapx(
703 bhv_desc_t *bdp,
704 void __user *arg);
705
706int
707xfs_ioctl(
708 bhv_desc_t *bdp,
709 struct inode *inode,
710 struct file *filp,
711 int ioflags,
712 unsigned int cmd,
713 void __user *arg)
714{
715 int error;
716 vnode_t *vp;
717 xfs_inode_t *ip;
718 xfs_mount_t *mp;
719
720 vp = LINVFS_GET_VP(inode);
721
722 vn_trace_entry(vp, "xfs_ioctl", (inst_t *)__return_address);
723
724 ip = XFS_BHVTOI(bdp);
725 mp = ip->i_mount;
726
727 switch (cmd) {
728
729 case XFS_IOC_ALLOCSP:
730 case XFS_IOC_FREESP:
731 case XFS_IOC_RESVSP:
732 case XFS_IOC_UNRESVSP:
733 case XFS_IOC_ALLOCSP64:
734 case XFS_IOC_FREESP64:
735 case XFS_IOC_RESVSP64:
736 case XFS_IOC_UNRESVSP64:
737 /*
738 * Only allow the sys admin to reserve space unless
739 * unwritten extents are enabled.
740 */
741 if (!XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) &&
742 !capable(CAP_SYS_ADMIN))
743 return -EPERM;
744
745 return xfs_ioc_space(bdp, vp, filp, ioflags, cmd, arg);
746
747 case XFS_IOC_DIOINFO: {
748 struct dioattr da;
749 xfs_buftarg_t *target =
750 (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
751 mp->m_rtdev_targp : mp->m_ddev_targp;
752
753 da.d_mem = da.d_miniosz = 1 << target->pbr_sshift;
754 /* The size dio will do in one go */
755 da.d_maxiosz = 64 * PAGE_CACHE_SIZE;
756
757 if (copy_to_user(arg, &da, sizeof(da)))
758 return -XFS_ERROR(EFAULT);
759 return 0;
760 }
761
762 case XFS_IOC_FSBULKSTAT_SINGLE:
763 case XFS_IOC_FSBULKSTAT:
764 case XFS_IOC_FSINUMBERS:
765 return xfs_ioc_bulkstat(mp, cmd, arg);
766
767 case XFS_IOC_FSGEOMETRY_V1:
768 return xfs_ioc_fsgeometry_v1(mp, arg);
769
770 case XFS_IOC_FSGEOMETRY:
771 return xfs_ioc_fsgeometry(mp, arg);
772
773 case XFS_IOC_GETVERSION:
774 case XFS_IOC_GETXFLAGS:
775 case XFS_IOC_SETXFLAGS:
776 case XFS_IOC_FSGETXATTR:
777 case XFS_IOC_FSSETXATTR:
778 case XFS_IOC_FSGETXATTRA:
779 return xfs_ioc_xattr(vp, ip, filp, cmd, arg);
780
781 case XFS_IOC_FSSETDM: {
782 struct fsdmidata dmi;
783
784 if (copy_from_user(&dmi, arg, sizeof(dmi)))
785 return -XFS_ERROR(EFAULT);
786
787 error = xfs_set_dmattrs(bdp, dmi.fsd_dmevmask, dmi.fsd_dmstate,
788 NULL);
789 return -error;
790 }
791
792 case XFS_IOC_GETBMAP:
793 case XFS_IOC_GETBMAPA:
794 return xfs_ioc_getbmap(bdp, filp, ioflags, cmd, arg);
795
796 case XFS_IOC_GETBMAPX:
797 return xfs_ioc_getbmapx(bdp, arg);
798
799 case XFS_IOC_FD_TO_HANDLE:
800 case XFS_IOC_PATH_TO_HANDLE:
801 case XFS_IOC_PATH_TO_FSHANDLE:
802 return xfs_find_handle(cmd, arg);
803
804 case XFS_IOC_OPEN_BY_HANDLE:
805 return xfs_open_by_handle(mp, arg, filp, inode);
806
807 case XFS_IOC_FSSETDM_BY_HANDLE:
808 return xfs_fssetdm_by_handle(mp, arg, filp, inode);
809
810 case XFS_IOC_READLINK_BY_HANDLE:
811 return xfs_readlink_by_handle(mp, arg, filp, inode);
812
813 case XFS_IOC_ATTRLIST_BY_HANDLE:
814 return xfs_attrlist_by_handle(mp, arg, filp, inode);
815
816 case XFS_IOC_ATTRMULTI_BY_HANDLE:
817 return xfs_attrmulti_by_handle(mp, arg, filp, inode);
818
819 case XFS_IOC_SWAPEXT: {
820 error = xfs_swapext((struct xfs_swapext __user *)arg);
821 return -error;
822 }
823
824 case XFS_IOC_FSCOUNTS: {
825 xfs_fsop_counts_t out;
826
827 error = xfs_fs_counts(mp, &out);
828 if (error)
829 return -error;
830
831 if (copy_to_user(arg, &out, sizeof(out)))
832 return -XFS_ERROR(EFAULT);
833 return 0;
834 }
835
836 case XFS_IOC_SET_RESBLKS: {
837 xfs_fsop_resblks_t inout;
838 __uint64_t in;
839
840 if (!capable(CAP_SYS_ADMIN))
841 return -EPERM;
842
843 if (copy_from_user(&inout, arg, sizeof(inout)))
844 return -XFS_ERROR(EFAULT);
845
846 /* input parameter is passed in resblks field of structure */
847 in = inout.resblks;
848 error = xfs_reserve_blocks(mp, &in, &inout);
849 if (error)
850 return -error;
851
852 if (copy_to_user(arg, &inout, sizeof(inout)))
853 return -XFS_ERROR(EFAULT);
854 return 0;
855 }
856
857 case XFS_IOC_GET_RESBLKS: {
858 xfs_fsop_resblks_t out;
859
860 if (!capable(CAP_SYS_ADMIN))
861 return -EPERM;
862
863 error = xfs_reserve_blocks(mp, NULL, &out);
864 if (error)
865 return -error;
866
867 if (copy_to_user(arg, &out, sizeof(out)))
868 return -XFS_ERROR(EFAULT);
869
870 return 0;
871 }
872
873 case XFS_IOC_FSGROWFSDATA: {
874 xfs_growfs_data_t in;
875
876 if (!capable(CAP_SYS_ADMIN))
877 return -EPERM;
878
879 if (copy_from_user(&in, arg, sizeof(in)))
880 return -XFS_ERROR(EFAULT);
881
882 error = xfs_growfs_data(mp, &in);
883 return -error;
884 }
885
886 case XFS_IOC_FSGROWFSLOG: {
887 xfs_growfs_log_t in;
888
889 if (!capable(CAP_SYS_ADMIN))
890 return -EPERM;
891
892 if (copy_from_user(&in, arg, sizeof(in)))
893 return -XFS_ERROR(EFAULT);
894
895 error = xfs_growfs_log(mp, &in);
896 return -error;
897 }
898
899 case XFS_IOC_FSGROWFSRT: {
900 xfs_growfs_rt_t in;
901
902 if (!capable(CAP_SYS_ADMIN))
903 return -EPERM;
904
905 if (copy_from_user(&in, arg, sizeof(in)))
906 return -XFS_ERROR(EFAULT);
907
908 error = xfs_growfs_rt(mp, &in);
909 return -error;
910 }
911
912 case XFS_IOC_FREEZE:
913 if (!capable(CAP_SYS_ADMIN))
914 return -EPERM;
915
916 if (inode->i_sb->s_frozen == SB_UNFROZEN)
917 freeze_bdev(inode->i_sb->s_bdev);
918 return 0;
919
920 case XFS_IOC_THAW:
921 if (!capable(CAP_SYS_ADMIN))
922 return -EPERM;
923 if (inode->i_sb->s_frozen != SB_UNFROZEN)
924 thaw_bdev(inode->i_sb->s_bdev, inode->i_sb);
925 return 0;
926
927 case XFS_IOC_GOINGDOWN: {
928 __uint32_t in;
929
930 if (!capable(CAP_SYS_ADMIN))
931 return -EPERM;
932
933 if (get_user(in, (__uint32_t __user *)arg))
934 return -XFS_ERROR(EFAULT);
935
936 error = xfs_fs_goingdown(mp, in);
937 return -error;
938 }
939
940 case XFS_IOC_ERROR_INJECTION: {
941 xfs_error_injection_t in;
942
943 if (!capable(CAP_SYS_ADMIN))
944 return -EPERM;
945
946 if (copy_from_user(&in, arg, sizeof(in)))
947 return -XFS_ERROR(EFAULT);
948
949 error = xfs_errortag_add(in.errtag, mp);
950 return -error;
951 }
952
953 case XFS_IOC_ERROR_CLEARALL:
954 if (!capable(CAP_SYS_ADMIN))
955 return -EPERM;
956
957 error = xfs_errortag_clearall(mp);
958 return -error;
959
960 default:
961 return -ENOTTY;
962 }
963}
964
965STATIC int
966xfs_ioc_space(
967 bhv_desc_t *bdp,
968 vnode_t *vp,
969 struct file *filp,
970 int ioflags,
971 unsigned int cmd,
972 void __user *arg)
973{
974 xfs_flock64_t bf;
975 int attr_flags = 0;
976 int error;
977
978 if (vp->v_inode.i_flags & (S_IMMUTABLE|S_APPEND))
979 return -XFS_ERROR(EPERM);
980
ad4a8ac4 981 if (!(filp->f_mode & FMODE_WRITE))
1da177e4
LT		 982 return -XFS_ERROR(EBADF);
983
0432dab2 984 if (!VN_ISREG(vp))
1da177e4
LT		 985 return -XFS_ERROR(EINVAL);
986
987 if (copy_from_user(&bf, arg, sizeof(bf)))
988 return -XFS_ERROR(EFAULT);
989
990 if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
991 attr_flags |= ATTR_NONBLOCK;
992 if (ioflags & IO_INVIS)
993 attr_flags |= ATTR_DMI;
994
995 error = xfs_change_file_space(bdp, cmd, &bf, filp->f_pos,
996 NULL, attr_flags);
997 return -error;
998}
999
1000STATIC int
1001xfs_ioc_bulkstat(
1002 xfs_mount_t *mp,
1003 unsigned int cmd,
1004 void __user *arg)
1005{
1006 xfs_fsop_bulkreq_t bulkreq;
1007 int count; /* # of records returned */
1008 xfs_ino_t inlast; /* last inode number */
1009 int done;
1010 int error;
1011
1012 /* done = 1 if there are more stats to get and if bulkstat */
1013 /* should be called again (unused here, but used in dmapi) */
1014
1015 if (!capable(CAP_SYS_ADMIN))
1016 return -EPERM;
1017
1018 if (XFS_FORCED_SHUTDOWN(mp))
1019 return -XFS_ERROR(EIO);
1020
1021 if (copy_from_user(&bulkreq, arg, sizeof(xfs_fsop_bulkreq_t)))
1022 return -XFS_ERROR(EFAULT);
1023
1024 if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
1025 return -XFS_ERROR(EFAULT);
1026
1027 if ((count = bulkreq.icount) <= 0)
1028 return -XFS_ERROR(EINVAL);
1029
1030 if (cmd == XFS_IOC_FSINUMBERS)
1031 error = xfs_inumbers(mp, &inlast, &count,
1032 bulkreq.ubuffer);
1033 else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
1034 error = xfs_bulkstat_single(mp, &inlast,
1035 bulkreq.ubuffer, &done);
1036 else { /* XFS_IOC_FSBULKSTAT */
1037 if (count == 1 && inlast != 0) {
1038 inlast++;
1039 error = xfs_bulkstat_single(mp, &inlast,
1040 bulkreq.ubuffer, &done);
1041 } else {
1042 error = xfs_bulkstat(mp, &inlast, &count,
1043 (bulkstat_one_pf)xfs_bulkstat_one, NULL,
1044 sizeof(xfs_bstat_t), bulkreq.ubuffer,
1045 BULKSTAT_FG_QUICK, &done);
1046 }
1047 }
1048
1049 if (error)
1050 return -error;
1051
1052 if (bulkreq.ocount != NULL) {
1053 if (copy_to_user(bulkreq.lastip, &inlast,
1054 sizeof(xfs_ino_t)))
1055 return -XFS_ERROR(EFAULT);
1056
1057 if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
1058 return -XFS_ERROR(EFAULT);
1059 }
1060
1061 return 0;
1062}
1063
1064STATIC int
1065xfs_ioc_fsgeometry_v1(
1066 xfs_mount_t *mp,
1067 void __user *arg)
1068{
1069 xfs_fsop_geom_v1_t fsgeo;
1070 int error;
1071
1072 error = xfs_fs_geometry(mp, (xfs_fsop_geom_t *)&fsgeo, 3);
1073 if (error)
1074 return -error;
1075
1076 if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
1077 return -XFS_ERROR(EFAULT);
1078 return 0;
1079}
1080
1081STATIC int
1082xfs_ioc_fsgeometry(
1083 xfs_mount_t *mp,
1084 void __user *arg)
1085{
1086 xfs_fsop_geom_t fsgeo;
1087 int error;
1088
1089 error = xfs_fs_geometry(mp, &fsgeo, 4);
1090 if (error)
1091 return -error;
1092
1093 if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
1094 return -XFS_ERROR(EFAULT);
1095 return 0;
1096}
1097
1098/*
1099 * Linux extended inode flags interface.
1100 */
1101#define LINUX_XFLAG_SYNC 0x00000008 /* Synchronous updates */
1102#define LINUX_XFLAG_IMMUTABLE 0x00000010 /* Immutable file */
1103#define LINUX_XFLAG_APPEND 0x00000020 /* writes to file may only append */
1104#define LINUX_XFLAG_NODUMP 0x00000040 /* do not dump file */
1105#define LINUX_XFLAG_NOATIME 0x00000080 /* do not update atime */
1106
1107STATIC unsigned int
1108xfs_merge_ioc_xflags(
1109 unsigned int flags,
1110 unsigned int start)
1111{
1112 unsigned int xflags = start;
1113
1114 if (flags & LINUX_XFLAG_IMMUTABLE)
1115 xflags |= XFS_XFLAG_IMMUTABLE;
1116 else
1117 xflags &= ~XFS_XFLAG_IMMUTABLE;
1118 if (flags & LINUX_XFLAG_APPEND)
1119 xflags |= XFS_XFLAG_APPEND;
1120 else
1121 xflags &= ~XFS_XFLAG_APPEND;
1122 if (flags & LINUX_XFLAG_SYNC)
1123 xflags |= XFS_XFLAG_SYNC;
1124 else
1125 xflags &= ~XFS_XFLAG_SYNC;
1126 if (flags & LINUX_XFLAG_NOATIME)
1127 xflags |= XFS_XFLAG_NOATIME;
1128 else
1129 xflags &= ~XFS_XFLAG_NOATIME;
1130 if (flags & LINUX_XFLAG_NODUMP)
1131 xflags |= XFS_XFLAG_NODUMP;
1132 else
1133 xflags &= ~XFS_XFLAG_NODUMP;
1134
1135 return xflags;
1136}
1137
1138STATIC unsigned int
1139xfs_di2lxflags(
1140 __uint16_t di_flags)
1141{
1142 unsigned int flags = 0;
1143
1144 if (di_flags & XFS_DIFLAG_IMMUTABLE)
1145 flags |= LINUX_XFLAG_IMMUTABLE;
1146 if (di_flags & XFS_DIFLAG_APPEND)
1147 flags |= LINUX_XFLAG_APPEND;
1148 if (di_flags & XFS_DIFLAG_SYNC)
1149 flags |= LINUX_XFLAG_SYNC;
1150 if (di_flags & XFS_DIFLAG_NOATIME)
1151 flags |= LINUX_XFLAG_NOATIME;
1152 if (di_flags & XFS_DIFLAG_NODUMP)
1153 flags |= LINUX_XFLAG_NODUMP;
1154 return flags;
1155}
1156
1157STATIC int
1158xfs_ioc_xattr(
1159 vnode_t *vp,
1160 xfs_inode_t *ip,
1161 struct file *filp,
1162 unsigned int cmd,
1163 void __user *arg)
1164{
1165 struct fsxattr fa;
1166 vattr_t va;
1167 int error;
1168 int attr_flags;
1169 unsigned int flags;
1170
1171 switch (cmd) {
1172 case XFS_IOC_FSGETXATTR: {
77bc5beb
NS		 1173 va.va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | \
1174 XFS_AT_NEXTENTS | XFS_AT_PROJID;
1da177e4
LT		 1175 VOP_GETATTR(vp, &va, 0, NULL, error);
1176 if (error)
1177 return -error;
1178
1179 fa.fsx_xflags = va.va_xflags;
1180 fa.fsx_extsize = va.va_extsize;
1181 fa.fsx_nextents = va.va_nextents;
77bc5beb 1182 fa.fsx_projid = va.va_projid;
1da177e4
LT		 1183
1184 if (copy_to_user(arg, &fa, sizeof(fa)))
1185 return -XFS_ERROR(EFAULT);
1186 return 0;
1187 }
1188
1189 case XFS_IOC_FSSETXATTR: {
1190 if (copy_from_user(&fa, arg, sizeof(fa)))
1191 return -XFS_ERROR(EFAULT);
1192
1193 attr_flags = 0;
1194 if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
1195 attr_flags |= ATTR_NONBLOCK;
1196
77bc5beb 1197 va.va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | XFS_AT_PROJID;
1da177e4
LT		 1198 va.va_xflags = fa.fsx_xflags;
1199 va.va_extsize = fa.fsx_extsize;
77bc5beb 1200 va.va_projid = fa.fsx_projid;
1da177e4
LT		 1201
1202 VOP_SETATTR(vp, &va, attr_flags, NULL, error);
1203 if (!error)
1204 vn_revalidate(vp); /* update Linux inode flags */
1205 return -error;
1206 }
1207
1208 case XFS_IOC_FSGETXATTRA: {
77bc5beb
NS		 1209 va.va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | \
1210 XFS_AT_ANEXTENTS | XFS_AT_PROJID;
1da177e4
LT		 1211 VOP_GETATTR(vp, &va, 0, NULL, error);
1212 if (error)
1213 return -error;
1214
1215 fa.fsx_xflags = va.va_xflags;
1216 fa.fsx_extsize = va.va_extsize;
1217 fa.fsx_nextents = va.va_anextents;
77bc5beb 1218 fa.fsx_projid = va.va_projid;
1da177e4
LT		 1219
1220 if (copy_to_user(arg, &fa, sizeof(fa)))
1221 return -XFS_ERROR(EFAULT);
1222 return 0;
1223 }
1224
1225 case XFS_IOC_GETXFLAGS: {
1226 flags = xfs_di2lxflags(ip->i_d.di_flags);
1227 if (copy_to_user(arg, &flags, sizeof(flags)))
1228 return -XFS_ERROR(EFAULT);
1229 return 0;
1230 }
1231
1232 case XFS_IOC_SETXFLAGS: {
1233 if (copy_from_user(&flags, arg, sizeof(flags)))
1234 return -XFS_ERROR(EFAULT);
1235
1236 if (flags & ~(LINUX_XFLAG_IMMUTABLE | LINUX_XFLAG_APPEND | \
1237 LINUX_XFLAG_NOATIME | LINUX_XFLAG_NODUMP | \
1238 LINUX_XFLAG_SYNC))
1239 return -XFS_ERROR(EOPNOTSUPP);
1240
1241 attr_flags = 0;
1242 if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
1243 attr_flags |= ATTR_NONBLOCK;
1244
1245 va.va_mask = XFS_AT_XFLAGS;
1246 va.va_xflags = xfs_merge_ioc_xflags(flags,
1247 xfs_ip2xflags(ip));
1248
1249 VOP_SETATTR(vp, &va, attr_flags, NULL, error);
1250 if (!error)
1251 vn_revalidate(vp); /* update Linux inode flags */
1252 return -error;
1253 }
1254
1255 case XFS_IOC_GETVERSION: {
1256 flags = LINVFS_GET_IP(vp)->i_generation;
1257 if (copy_to_user(arg, &flags, sizeof(flags)))
1258 return -XFS_ERROR(EFAULT);
1259 return 0;
1260 }
1261
1262 default:
1263 return -ENOTTY;
1264 }
1265}
1266
1267STATIC int
1268xfs_ioc_getbmap(
1269 bhv_desc_t *bdp,
1270 struct file *filp,
1271 int ioflags,
1272 unsigned int cmd,
1273 void __user *arg)
1274{
1275 struct getbmap bm;
1276 int iflags;
1277 int error;
1278
1279 if (copy_from_user(&bm, arg, sizeof(bm)))
1280 return -XFS_ERROR(EFAULT);
1281
1282 if (bm.bmv_count < 2)
1283 return -XFS_ERROR(EINVAL);
1284
1285 iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
1286 if (ioflags & IO_INVIS)
1287 iflags |= BMV_IF_NO_DMAPI_READ;
1288
1289 error = xfs_getbmap(bdp, &bm, (struct getbmap __user *)arg+1, iflags);
1290 if (error)
1291 return -error;
1292
1293 if (copy_to_user(arg, &bm, sizeof(bm)))
1294 return -XFS_ERROR(EFAULT);
1295 return 0;
1296}
1297
1298STATIC int
1299xfs_ioc_getbmapx(
1300 bhv_desc_t *bdp,
1301 void __user *arg)
1302{
1303 struct getbmapx bmx;
1304 struct getbmap bm;
1305 int iflags;
1306 int error;
1307
1308 if (copy_from_user(&bmx, arg, sizeof(bmx)))
1309 return -XFS_ERROR(EFAULT);
1310
1311 if (bmx.bmv_count < 2)
1312 return -XFS_ERROR(EINVAL);
1313
1314 /*
1315 * Map input getbmapx structure to a getbmap
1316 * structure for xfs_getbmap.
1317 */
1318 GETBMAP_CONVERT(bmx, bm);
1319
1320 iflags = bmx.bmv_iflags;
1321
1322 if (iflags & (~BMV_IF_VALID))
1323 return -XFS_ERROR(EINVAL);
1324
1325 iflags |= BMV_IF_EXTENDED;
1326
1327 error = xfs_getbmap(bdp, &bm, (struct getbmapx __user *)arg+1, iflags);
1328 if (error)
1329 return -error;
1330
1331 GETBMAP_CONVERT(bm, bmx);
1332
1333 if (copy_to_user(arg, &bmx, sizeof(bmx)))
1334 return -XFS_ERROR(EFAULT);
1335
1336 return 0;
1337}
kernel source for telekom puls (alcatel/mediatek)