~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_ioctl.c

Version: ~ [ linux-5.5-rc1 ] ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  3  * All Rights Reserved.
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it would be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write the Free Software Foundation,
 16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17  */
 18 #include "xfs.h"
 19 #include "xfs_fs.h"
 20 #include "xfs_shared.h"
 21 #include "xfs_format.h"
 22 #include "xfs_log_format.h"
 23 #include "xfs_trans_resv.h"
 24 #include "xfs_mount.h"
 25 #include "xfs_inode.h"
 26 #include "xfs_ioctl.h"
 27 #include "xfs_alloc.h"
 28 #include "xfs_rtalloc.h"
 29 #include "xfs_itable.h"
 30 #include "xfs_error.h"
 31 #include "xfs_attr.h"
 32 #include "xfs_bmap.h"
 33 #include "xfs_bmap_util.h"
 34 #include "xfs_fsops.h"
 35 #include "xfs_discard.h"
 36 #include "xfs_quota.h"
 37 #include "xfs_export.h"
 38 #include "xfs_trace.h"
 39 #include "xfs_icache.h"
 40 #include "xfs_symlink.h"
 41 #include "xfs_trans.h"
 42 #include "xfs_pnfs.h"
 43 #include "xfs_acl.h"
 44 #include "xfs_btree.h"
 45 #include <linux/fsmap.h>
 46 #include "xfs_fsmap.h"
 47 #include "scrub/xfs_scrub.h"
 48 
 49 #include <linux/capability.h>
 50 #include <linux/cred.h>
 51 #include <linux/dcache.h>
 52 #include <linux/mount.h>
 53 #include <linux/namei.h>
 54 #include <linux/pagemap.h>
 55 #include <linux/slab.h>
 56 #include <linux/exportfs.h>
 57 
 58 /*
 59  * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
 60  * a file or fs handle.
 61  *
 62  * XFS_IOC_PATH_TO_FSHANDLE
 63  *    returns fs handle for a mount point or path within that mount point
 64  * XFS_IOC_FD_TO_HANDLE
 65  *    returns full handle for a FD opened in user space
 66  * XFS_IOC_PATH_TO_HANDLE
 67  *    returns full handle for a path
 68  */
 69 int
 70 xfs_find_handle(
 71         unsigned int            cmd,
 72         xfs_fsop_handlereq_t    *hreq)
 73 {
 74         int                     hsize;
 75         xfs_handle_t            handle;
 76         struct inode            *inode;
 77         struct fd               f = {NULL};
 78         struct path             path;
 79         int                     error;
 80         struct xfs_inode        *ip;
 81 
 82         if (cmd == XFS_IOC_FD_TO_HANDLE) {
 83                 f = fdget(hreq->fd);
 84                 if (!f.file)
 85                         return -EBADF;
 86                 inode = file_inode(f.file);
 87         } else {
 88                 error = user_lpath((const char __user *)hreq->path, &path);
 89                 if (error)
 90                         return error;
 91                 inode = d_inode(path.dentry);
 92         }
 93         ip = XFS_I(inode);
 94 
 95         /*
 96          * We can only generate handles for inodes residing on a XFS filesystem,
 97          * and only for regular files, directories or symbolic links.
 98          */
 99         error = -EINVAL;
100         if (inode->i_sb->s_magic != XFS_SB_MAGIC)
101                 goto out_put;
102 
103         error = -EBADF;
104         if (!S_ISREG(inode->i_mode) &&
105             !S_ISDIR(inode->i_mode) &&
106             !S_ISLNK(inode->i_mode))
107                 goto out_put;
108 
109 
110         memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));
111 
112         if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
113                 /*
114                  * This handle only contains an fsid, zero the rest.
115                  */
116                 memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
117                 hsize = sizeof(xfs_fsid_t);
118         } else {
119                 handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
120                                         sizeof(handle.ha_fid.fid_len);
121                 handle.ha_fid.fid_pad = 0;
122                 handle.ha_fid.fid_gen = inode->i_generation;
123                 handle.ha_fid.fid_ino = ip->i_ino;
124                 hsize = sizeof(xfs_handle_t);
125         }
126 
127         error = -EFAULT;
128         if (copy_to_user(hreq->ohandle, &handle, hsize) ||
129             copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
130                 goto out_put;
131 
132         error = 0;
133 
134  out_put:
135         if (cmd == XFS_IOC_FD_TO_HANDLE)
136                 fdput(f);
137         else
138                 path_put(&path);
139         return error;
140 }
141 
142 /*
143  * No need to do permission checks on the various pathname components
144  * as the handle operations are privileged.
145  */
146 STATIC int
147 xfs_handle_acceptable(
148         void                    *context,
149         struct dentry           *dentry)
150 {
151         return 1;
152 }
153 
154 /*
155  * Convert userspace handle data into a dentry.
156  */
157 struct dentry *
158 xfs_handle_to_dentry(
159         struct file             *parfilp,
160         void __user             *uhandle,
161         u32                     hlen)
162 {
163         xfs_handle_t            handle;
164         struct xfs_fid64        fid;
165 
166         /*
167          * Only allow handle opens under a directory.
168          */
169         if (!S_ISDIR(file_inode(parfilp)->i_mode))
170                 return ERR_PTR(-ENOTDIR);
171 
172         if (hlen != sizeof(xfs_handle_t))
173                 return ERR_PTR(-EINVAL);
174         if (copy_from_user(&handle, uhandle, hlen))
175                 return ERR_PTR(-EFAULT);
176         if (handle.ha_fid.fid_len !=
177             sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
178                 return ERR_PTR(-EINVAL);
179 
180         memset(&fid, 0, sizeof(struct fid));
181         fid.ino = handle.ha_fid.fid_ino;
182         fid.gen = handle.ha_fid.fid_gen;
183 
184         return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
185                         FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
186                         xfs_handle_acceptable, NULL);
187 }
188 
189 STATIC struct dentry *
190 xfs_handlereq_to_dentry(
191         struct file             *parfilp,
192         xfs_fsop_handlereq_t    *hreq)
193 {
194         return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
195 }
196 
197 int
198 xfs_open_by_handle(
199         struct file             *parfilp,
200         xfs_fsop_handlereq_t    *hreq)
201 {
202         const struct cred       *cred = current_cred();
203         int                     error;
204         int                     fd;
205         int                     permflag;
206         struct file             *filp;
207         struct inode            *inode;
208         struct dentry           *dentry;
209         fmode_t                 fmode;
210         struct path             path;
211 
212         if (!capable(CAP_SYS_ADMIN))
213                 return -EPERM;
214 
215         dentry = xfs_handlereq_to_dentry(parfilp, hreq);
216         if (IS_ERR(dentry))
217                 return PTR_ERR(dentry);
218         inode = d_inode(dentry);
219 
220         /* Restrict xfs_open_by_handle to directories & regular files. */
221         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
222                 error = -EPERM;
223                 goto out_dput;
224         }
225 
226 #if BITS_PER_LONG != 32
227         hreq->oflags |= O_LARGEFILE;
228 #endif
229 
230         permflag = hreq->oflags;
231         fmode = OPEN_FMODE(permflag);
232         if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
233             (fmode & FMODE_WRITE) && IS_APPEND(inode)) {
234                 error = -EPERM;
235                 goto out_dput;
236         }
237 
238         if ((fmode & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
239                 error = -EPERM;
240                 goto out_dput;
241         }
242 
243         /* Can't write directories. */
244         if (S_ISDIR(inode->i_mode) && (fmode & FMODE_WRITE)) {
245                 error = -EISDIR;
246                 goto out_dput;
247         }
248 
249         fd = get_unused_fd_flags(0);
250         if (fd < 0) {
251                 error = fd;
252                 goto out_dput;
253         }
254 
255         path.mnt = parfilp->f_path.mnt;
256         path.dentry = dentry;
257         filp = dentry_open(&path, hreq->oflags, cred);
258         dput(dentry);
259         if (IS_ERR(filp)) {
260                 put_unused_fd(fd);
261                 return PTR_ERR(filp);
262         }
263 
264         if (S_ISREG(inode->i_mode)) {
265                 filp->f_flags |= O_NOATIME;
266                 filp->f_mode |= FMODE_NOCMTIME;
267         }
268 
269         fd_install(fd, filp);
270         return fd;
271 
272  out_dput:
273         dput(dentry);
274         return error;
275 }
276 
277 int
278 xfs_readlink_by_handle(
279         struct file             *parfilp,
280         xfs_fsop_handlereq_t    *hreq)
281 {
282         struct dentry           *dentry;
283         __u32                   olen;
284         int                     error;
285 
286         if (!capable(CAP_SYS_ADMIN))
287                 return -EPERM;
288 
289         dentry = xfs_handlereq_to_dentry(parfilp, hreq);
290         if (IS_ERR(dentry))
291                 return PTR_ERR(dentry);
292 
293         /* Restrict this handle operation to symlinks only. */
294         if (!d_is_symlink(dentry)) {
295                 error = -EINVAL;
296                 goto out_dput;
297         }
298 
299         if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
300                 error = -EFAULT;
301                 goto out_dput;
302         }
303 
304         error = vfs_readlink(dentry, hreq->ohandle, olen);
305 
306  out_dput:
307         dput(dentry);
308         return error;
309 }
310 
311 int
312 xfs_set_dmattrs(
313         xfs_inode_t     *ip,
314         uint            evmask,
315         uint16_t        state)
316 {
317         xfs_mount_t     *mp = ip->i_mount;
318         xfs_trans_t     *tp;
319         int             error;
320 
321         if (!capable(CAP_SYS_ADMIN))
322                 return -EPERM;
323 
324         if (XFS_FORCED_SHUTDOWN(mp))
325                 return -EIO;
326 
327         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
328         if (error)
329                 return error;
330 
331         xfs_ilock(ip, XFS_ILOCK_EXCL);
332         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
333 
334         ip->i_d.di_dmevmask = evmask;
335         ip->i_d.di_dmstate  = state;
336 
337         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
338         error = xfs_trans_commit(tp);
339 
340         return error;
341 }
342 
343 STATIC int
344 xfs_fssetdm_by_handle(
345         struct file             *parfilp,
346         void                    __user *arg)
347 {
348         int                     error;
349         struct fsdmidata        fsd;
350         xfs_fsop_setdm_handlereq_t dmhreq;
351         struct dentry           *dentry;
352 
353         if (!capable(CAP_MKNOD))
354                 return -EPERM;
355         if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
356                 return -EFAULT;
357 
358         error = mnt_want_write_file(parfilp);
359         if (error)
360                 return error;
361 
362         dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
363         if (IS_ERR(dentry)) {
364                 mnt_drop_write_file(parfilp);
365                 return PTR_ERR(dentry);
366         }
367 
368         if (IS_IMMUTABLE(d_inode(dentry)) || IS_APPEND(d_inode(dentry))) {
369                 error = -EPERM;
370                 goto out;
371         }
372 
373         if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
374                 error = -EFAULT;
375                 goto out;
376         }
377 
378         error = xfs_set_dmattrs(XFS_I(d_inode(dentry)), fsd.fsd_dmevmask,
379                                  fsd.fsd_dmstate);
380 
381  out:
382         mnt_drop_write_file(parfilp);
383         dput(dentry);
384         return error;
385 }
386 
387 STATIC int
388 xfs_attrlist_by_handle(
389         struct file             *parfilp,
390         void                    __user *arg)
391 {
392         int                     error = -ENOMEM;
393         attrlist_cursor_kern_t  *cursor;
394         struct xfs_fsop_attrlist_handlereq __user       *p = arg;
395         xfs_fsop_attrlist_handlereq_t al_hreq;
396         struct dentry           *dentry;
397         char                    *kbuf;
398 
399         if (!capable(CAP_SYS_ADMIN))
400                 return -EPERM;
401         if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
402                 return -EFAULT;
403         if (al_hreq.buflen < sizeof(struct attrlist) ||
404             al_hreq.buflen > XFS_XATTR_LIST_MAX)
405                 return -EINVAL;
406 
407         /*
408          * Reject flags, only allow namespaces.
409          */
410         if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
411                 return -EINVAL;
412 
413         dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
414         if (IS_ERR(dentry))
415                 return PTR_ERR(dentry);
416 
417         kbuf = kmem_zalloc_large(al_hreq.buflen, KM_SLEEP);
418         if (!kbuf)
419                 goto out_dput;
420 
421         cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
422         error = xfs_attr_list(XFS_I(d_inode(dentry)), kbuf, al_hreq.buflen,
423                                         al_hreq.flags, cursor);
424         if (error)
425                 goto out_kfree;
426 
427         if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t))) {
428                 error = -EFAULT;
429                 goto out_kfree;
430         }
431 
432         if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
433                 error = -EFAULT;
434 
435 out_kfree:
436         kmem_free(kbuf);
437 out_dput:
438         dput(dentry);
439         return error;
440 }
441 
442 int
443 xfs_attrmulti_attr_get(
444         struct inode            *inode,
445         unsigned char           *name,
446         unsigned char           __user *ubuf,
447         uint32_t                *len,
448         uint32_t                flags)
449 {
450         unsigned char           *kbuf;
451         int                     error = -EFAULT;
452 
453         if (*len > XFS_XATTR_SIZE_MAX)
454                 return -EINVAL;
455         kbuf = kmem_zalloc_large(*len, KM_SLEEP);
456         if (!kbuf)
457                 return -ENOMEM;
458 
459         error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags);
460         if (error)
461                 goto out_kfree;
462 
463         if (copy_to_user(ubuf, kbuf, *len))
464                 error = -EFAULT;
465 
466 out_kfree:
467         kmem_free(kbuf);
468         return error;
469 }
470 
471 int
472 xfs_attrmulti_attr_set(
473         struct inode            *inode,
474         unsigned char           *name,
475         const unsigned char     __user *ubuf,
476         uint32_t                len,
477         uint32_t                flags)
478 {
479         unsigned char           *kbuf;
480         int                     error;
481 
482         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
483                 return -EPERM;
484         if (len > XFS_XATTR_SIZE_MAX)
485                 return -EINVAL;
486 
487         kbuf = memdup_user(ubuf, len);
488         if (IS_ERR(kbuf))
489                 return PTR_ERR(kbuf);
490 
491         error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);
492         if (!error)
493                 xfs_forget_acl(inode, name, flags);
494         kfree(kbuf);
495         return error;
496 }
497 
498 int
499 xfs_attrmulti_attr_remove(
500         struct inode            *inode,
501         unsigned char           *name,
502         uint32_t                flags)
503 {
504         int                     error;
505 
506         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
507                 return -EPERM;
508         error = xfs_attr_remove(XFS_I(inode), name, flags);
509         if (!error)
510                 xfs_forget_acl(inode, name, flags);
511         return error;
512 }
513 
514 STATIC int
515 xfs_attrmulti_by_handle(
516         struct file             *parfilp,
517         void                    __user *arg)
518 {
519         int                     error;
520         xfs_attr_multiop_t      *ops;
521         xfs_fsop_attrmulti_handlereq_t am_hreq;
522         struct dentry           *dentry;
523         unsigned int            i, size;
524         unsigned char           *attr_name;
525 
526         if (!capable(CAP_SYS_ADMIN))
527                 return -EPERM;
528         if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
529                 return -EFAULT;
530 
531         /* overflow check */
532         if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
533                 return -E2BIG;
534 
535         dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
536         if (IS_ERR(dentry))
537                 return PTR_ERR(dentry);
538 
539         error = -E2BIG;
540         size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
541         if (!size || size > 16 * PAGE_SIZE)
542                 goto out_dput;
543 
544         ops = memdup_user(am_hreq.ops, size);
545         if (IS_ERR(ops)) {
546                 error = PTR_ERR(ops);
547                 goto out_dput;
548         }
549 
550         error = -ENOMEM;
551         attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
552         if (!attr_name)
553                 goto out_kfree_ops;
554 
555         error = 0;
556         for (i = 0; i < am_hreq.opcount; i++) {
557                 ops[i].am_error = strncpy_from_user((char *)attr_name,
558                                 ops[i].am_attrname, MAXNAMELEN);
559                 if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
560                         error = -ERANGE;
561                 if (ops[i].am_error < 0)
562                         break;
563 
564                 switch (ops[i].am_opcode) {
565                 case ATTR_OP_GET:
566                         ops[i].am_error = xfs_attrmulti_attr_get(
567                                         d_inode(dentry), attr_name,
568                                         ops[i].am_attrvalue, &ops[i].am_length,
569                                         ops[i].am_flags);
570                         break;
571                 case ATTR_OP_SET:
572                         ops[i].am_error = mnt_want_write_file(parfilp);
573                         if (ops[i].am_error)
574                                 break;
575                         ops[i].am_error = xfs_attrmulti_attr_set(
576                                         d_inode(dentry), attr_name,
577                                         ops[i].am_attrvalue, ops[i].am_length,
578                                         ops[i].am_flags);
579                         mnt_drop_write_file(parfilp);
580                         break;
581                 case ATTR_OP_REMOVE:
582                         ops[i].am_error = mnt_want_write_file(parfilp);
583                         if (ops[i].am_error)
584                                 break;
585                         ops[i].am_error = xfs_attrmulti_attr_remove(
586                                         d_inode(dentry), attr_name,
587                                         ops[i].am_flags);
588                         mnt_drop_write_file(parfilp);
589                         break;
590                 default:
591                         ops[i].am_error = -EINVAL;
592                 }
593         }
594 
595         if (copy_to_user(am_hreq.ops, ops, size))
596                 error = -EFAULT;
597 
598         kfree(attr_name);
599  out_kfree_ops:
600         kfree(ops);
601  out_dput:
602         dput(dentry);
603         return error;
604 }
605 
606 int
607 xfs_ioc_space(
608         struct file             *filp,
609         unsigned int            cmd,
610         xfs_flock64_t           *bf)
611 {
612         struct inode            *inode = file_inode(filp);
613         struct xfs_inode        *ip = XFS_I(inode);
614         struct iattr            iattr;
615         enum xfs_prealloc_flags flags = 0;
616         uint                    iolock = XFS_IOLOCK_EXCL;
617         int                     error;
618 
619         /*
620          * Only allow the sys admin to reserve space unless
621          * unwritten extents are enabled.
622          */
623         if (!xfs_sb_version_hasextflgbit(&ip->i_mount->m_sb) &&
624             !capable(CAP_SYS_ADMIN))
625                 return -EPERM;
626 
627         if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
628                 return -EPERM;
629 
630         if (!(filp->f_mode & FMODE_WRITE))
631                 return -EBADF;
632 
633         if (!S_ISREG(inode->i_mode))
634                 return -EINVAL;
635 
636         if (filp->f_flags & O_DSYNC)
637                 flags |= XFS_PREALLOC_SYNC;
638         if (filp->f_mode & FMODE_NOCMTIME)
639                 flags |= XFS_PREALLOC_INVISIBLE;
640 
641         error = mnt_want_write_file(filp);
642         if (error)
643                 return error;
644 
645         xfs_ilock(ip, iolock);
646         error = xfs_break_layouts(inode, &iolock);
647         if (error)
648                 goto out_unlock;
649 
650         xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
651         iolock |= XFS_MMAPLOCK_EXCL;
652 
653         switch (bf->l_whence) {
654         case 0: /*SEEK_SET*/
655                 break;
656         case 1: /*SEEK_CUR*/
657                 bf->l_start += filp->f_pos;
658                 break;
659         case 2: /*SEEK_END*/
660                 bf->l_start += XFS_ISIZE(ip);
661                 break;
662         default:
663                 error = -EINVAL;
664                 goto out_unlock;
665         }
666 
667         /*
668          * length of <= 0 for resv/unresv/zero is invalid.  length for
669          * alloc/free is ignored completely and we have no idea what userspace
670          * might have set it to, so set it to zero to allow range
671          * checks to pass.
672          */
673         switch (cmd) {
674         case XFS_IOC_ZERO_RANGE:
675         case XFS_IOC_RESVSP:
676         case XFS_IOC_RESVSP64:
677         case XFS_IOC_UNRESVSP:
678         case XFS_IOC_UNRESVSP64:
679                 if (bf->l_len <= 0) {
680                         error = -EINVAL;
681                         goto out_unlock;
682                 }
683                 break;
684         default:
685                 bf->l_len = 0;
686                 break;
687         }
688 
689         if (bf->l_start < 0 ||
690             bf->l_start > inode->i_sb->s_maxbytes ||
691             bf->l_start + bf->l_len < 0 ||
692             bf->l_start + bf->l_len >= inode->i_sb->s_maxbytes) {
693                 error = -EINVAL;
694                 goto out_unlock;
695         }
696 
697         switch (cmd) {
698         case XFS_IOC_ZERO_RANGE:
699                 flags |= XFS_PREALLOC_SET;
700                 error = xfs_zero_file_space(ip, bf->l_start, bf->l_len);
701                 break;
702         case XFS_IOC_RESVSP:
703         case XFS_IOC_RESVSP64:
704                 flags |= XFS_PREALLOC_SET;
705                 error = xfs_alloc_file_space(ip, bf->l_start, bf->l_len,
706                                                 XFS_BMAPI_PREALLOC);
707                 break;
708         case XFS_IOC_UNRESVSP:
709         case XFS_IOC_UNRESVSP64:
710                 error = xfs_free_file_space(ip, bf->l_start, bf->l_len);
711                 break;
712         case XFS_IOC_ALLOCSP:
713         case XFS_IOC_ALLOCSP64:
714         case XFS_IOC_FREESP:
715         case XFS_IOC_FREESP64:
716                 flags |= XFS_PREALLOC_CLEAR;
717                 if (bf->l_start > XFS_ISIZE(ip)) {
718                         error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
719                                         bf->l_start - XFS_ISIZE(ip), 0);
720                         if (error)
721                                 goto out_unlock;
722                 }
723 
724                 iattr.ia_valid = ATTR_SIZE;
725                 iattr.ia_size = bf->l_start;
726 
727                 error = xfs_vn_setattr_size(file_dentry(filp), &iattr);
728                 break;
729         default:
730                 ASSERT(0);
731                 error = -EINVAL;
732         }
733 
734         if (error)
735                 goto out_unlock;
736 
737         error = xfs_update_prealloc_flags(ip, flags);
738 
739 out_unlock:
740         xfs_iunlock(ip, iolock);
741         mnt_drop_write_file(filp);
742         return error;
743 }
744 
745 STATIC int
746 xfs_ioc_bulkstat(
747         xfs_mount_t             *mp,
748         unsigned int            cmd,
749         void                    __user *arg)
750 {
751         xfs_fsop_bulkreq_t      bulkreq;
752         int                     count;  /* # of records returned */
753         xfs_ino_t               inlast; /* last inode number */
754         int                     done;
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(xfs_fsop_bulkreq_t)))
767                 return -EFAULT;
768 
769         if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
770                 return -EFAULT;
771 
772         if ((count = bulkreq.icount) <= 0)
773                 return -EINVAL;
774 
775         if (bulkreq.ubuffer == NULL)
776                 return -EINVAL;
777 
778         if (cmd == XFS_IOC_FSINUMBERS)
779                 error = xfs_inumbers(mp, &inlast, &count,
780                                         bulkreq.ubuffer, xfs_inumbers_fmt);
781         else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
782                 error = xfs_bulkstat_one(mp, inlast, bulkreq.ubuffer,
783                                         sizeof(xfs_bstat_t), NULL, &done);
784         else    /* XFS_IOC_FSBULKSTAT */
785                 error = xfs_bulkstat(mp, &inlast, &count, xfs_bulkstat_one,
786                                      sizeof(xfs_bstat_t), bulkreq.ubuffer,
787                                      &done);
788 
789         if (error)
790                 return error;
791 
792         if (bulkreq.ocount != NULL) {
793                 if (copy_to_user(bulkreq.lastip, &inlast,
794                                                 sizeof(xfs_ino_t)))
795                         return -EFAULT;
796 
797                 if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
798                         return -EFAULT;
799         }
800 
801         return 0;
802 }
803 
804 STATIC int
805 xfs_ioc_fsgeometry_v1(
806         xfs_mount_t             *mp,
807         void                    __user *arg)
808 {
809         xfs_fsop_geom_t         fsgeo;
810         int                     error;
811 
812         error = xfs_fs_geometry(mp, &fsgeo, 3);
813         if (error)
814                 return error;
815 
816         /*
817          * Caller should have passed an argument of type
818          * xfs_fsop_geom_v1_t.  This is a proper subset of the
819          * xfs_fsop_geom_t that xfs_fs_geometry() fills in.
820          */
821         if (copy_to_user(arg, &fsgeo, sizeof(xfs_fsop_geom_v1_t)))
822                 return -EFAULT;
823         return 0;
824 }
825 
826 STATIC int
827 xfs_ioc_fsgeometry(
828         xfs_mount_t             *mp,
829         void                    __user *arg)
830 {
831         xfs_fsop_geom_t         fsgeo;
832         int                     error;
833 
834         error = xfs_fs_geometry(mp, &fsgeo, 4);
835         if (error)
836                 return error;
837 
838         if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
839                 return -EFAULT;
840         return 0;
841 }
842 
843 /*
844  * Linux extended inode flags interface.
845  */
846 
847 STATIC unsigned int
848 xfs_merge_ioc_xflags(
849         unsigned int    flags,
850         unsigned int    start)
851 {
852         unsigned int    xflags = start;
853 
854         if (flags & FS_IMMUTABLE_FL)
855                 xflags |= FS_XFLAG_IMMUTABLE;
856         else
857                 xflags &= ~FS_XFLAG_IMMUTABLE;
858         if (flags & FS_APPEND_FL)
859                 xflags |= FS_XFLAG_APPEND;
860         else
861                 xflags &= ~FS_XFLAG_APPEND;
862         if (flags & FS_SYNC_FL)
863                 xflags |= FS_XFLAG_SYNC;
864         else
865                 xflags &= ~FS_XFLAG_SYNC;
866         if (flags & FS_NOATIME_FL)
867                 xflags |= FS_XFLAG_NOATIME;
868         else
869                 xflags &= ~FS_XFLAG_NOATIME;
870         if (flags & FS_NODUMP_FL)
871                 xflags |= FS_XFLAG_NODUMP;
872         else
873                 xflags &= ~FS_XFLAG_NODUMP;
874 
875         return xflags;
876 }
877 
878 STATIC unsigned int
879 xfs_di2lxflags(
880         uint16_t        di_flags)
881 {
882         unsigned int    flags = 0;
883 
884         if (di_flags & XFS_DIFLAG_IMMUTABLE)
885                 flags |= FS_IMMUTABLE_FL;
886         if (di_flags & XFS_DIFLAG_APPEND)
887                 flags |= FS_APPEND_FL;
888         if (di_flags & XFS_DIFLAG_SYNC)
889                 flags |= FS_SYNC_FL;
890         if (di_flags & XFS_DIFLAG_NOATIME)
891                 flags |= FS_NOATIME_FL;
892         if (di_flags & XFS_DIFLAG_NODUMP)
893                 flags |= FS_NODUMP_FL;
894         return flags;
895 }
896 
897 STATIC int
898 xfs_ioc_fsgetxattr(
899         xfs_inode_t             *ip,
900         int                     attr,
901         void                    __user *arg)
902 {
903         struct fsxattr          fa;
904 
905         memset(&fa, 0, sizeof(struct fsxattr));
906 
907         xfs_ilock(ip, XFS_ILOCK_SHARED);
908         fa.fsx_xflags = xfs_ip2xflags(ip);
909         fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
910         fa.fsx_cowextsize = ip->i_d.di_cowextsize <<
911                         ip->i_mount->m_sb.sb_blocklog;
912         fa.fsx_projid = xfs_get_projid(ip);
913 
914         if (attr) {
915                 if (ip->i_afp) {
916                         if (ip->i_afp->if_flags & XFS_IFEXTENTS)
917                                 fa.fsx_nextents = xfs_iext_count(ip->i_afp);
918                         else
919                                 fa.fsx_nextents = ip->i_d.di_anextents;
920                 } else
921                         fa.fsx_nextents = 0;
922         } else {
923                 if (ip->i_df.if_flags & XFS_IFEXTENTS)
924                         fa.fsx_nextents = xfs_iext_count(&ip->i_df);
925                 else
926                         fa.fsx_nextents = ip->i_d.di_nextents;
927         }
928         xfs_iunlock(ip, XFS_ILOCK_SHARED);
929 
930         if (copy_to_user(arg, &fa, sizeof(fa)))
931                 return -EFAULT;
932         return 0;
933 }
934 
935 STATIC uint16_t
936 xfs_flags2diflags(
937         struct xfs_inode        *ip,
938         unsigned int            xflags)
939 {
940         /* can't set PREALLOC this way, just preserve it */
941         uint16_t                di_flags =
942                 (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
943 
944         if (xflags & FS_XFLAG_IMMUTABLE)
945                 di_flags |= XFS_DIFLAG_IMMUTABLE;
946         if (xflags & FS_XFLAG_APPEND)
947                 di_flags |= XFS_DIFLAG_APPEND;
948         if (xflags & FS_XFLAG_SYNC)
949                 di_flags |= XFS_DIFLAG_SYNC;
950         if (xflags & FS_XFLAG_NOATIME)
951                 di_flags |= XFS_DIFLAG_NOATIME;
952         if (xflags & FS_XFLAG_NODUMP)
953                 di_flags |= XFS_DIFLAG_NODUMP;
954         if (xflags & FS_XFLAG_NODEFRAG)
955                 di_flags |= XFS_DIFLAG_NODEFRAG;
956         if (xflags & FS_XFLAG_FILESTREAM)
957                 di_flags |= XFS_DIFLAG_FILESTREAM;
958         if (S_ISDIR(VFS_I(ip)->i_mode)) {
959                 if (xflags & FS_XFLAG_RTINHERIT)
960                         di_flags |= XFS_DIFLAG_RTINHERIT;
961                 if (xflags & FS_XFLAG_NOSYMLINKS)
962                         di_flags |= XFS_DIFLAG_NOSYMLINKS;
963                 if (xflags & FS_XFLAG_EXTSZINHERIT)
964                         di_flags |= XFS_DIFLAG_EXTSZINHERIT;
965                 if (xflags & FS_XFLAG_PROJINHERIT)
966                         di_flags |= XFS_DIFLAG_PROJINHERIT;
967         } else if (S_ISREG(VFS_I(ip)->i_mode)) {
968                 if (xflags & FS_XFLAG_REALTIME)
969                         di_flags |= XFS_DIFLAG_REALTIME;
970                 if (xflags & FS_XFLAG_EXTSIZE)
971                         di_flags |= XFS_DIFLAG_EXTSIZE;
972         }
973 
974         return di_flags;
975 }
976 
977 STATIC uint64_t
978 xfs_flags2diflags2(
979         struct xfs_inode        *ip,
980         unsigned int            xflags)
981 {
982         uint64_t                di_flags2 =
983                 (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK);
984 
985         if (xflags & FS_XFLAG_DAX)
986                 di_flags2 |= XFS_DIFLAG2_DAX;
987         if (xflags & FS_XFLAG_COWEXTSIZE)
988                 di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
989 
990         return di_flags2;
991 }
992 
993 STATIC void
994 xfs_diflags_to_linux(
995         struct xfs_inode        *ip)
996 {
997         struct inode            *inode = VFS_I(ip);
998         unsigned int            xflags = xfs_ip2xflags(ip);
999 
1000         if (xflags & FS_XFLAG_IMMUTABLE)
1001                 inode->i_flags |= S_IMMUTABLE;
1002         else
1003                 inode->i_flags &= ~S_IMMUTABLE;
1004         if (xflags & FS_XFLAG_APPEND)
1005                 inode->i_flags |= S_APPEND;
1006         else
1007                 inode->i_flags &= ~S_APPEND;
1008         if (xflags & FS_XFLAG_SYNC)
1009                 inode->i_flags |= S_SYNC;
1010         else
1011                 inode->i_flags &= ~S_SYNC;
1012         if (xflags & FS_XFLAG_NOATIME)
1013                 inode->i_flags |= S_NOATIME;
1014         else
1015                 inode->i_flags &= ~S_NOATIME;
1016 #if 0   /* disabled until the flag switching races are sorted out */
1017         if (xflags & FS_XFLAG_DAX)
1018                 inode->i_flags |= S_DAX;
1019         else
1020                 inode->i_flags &= ~S_DAX;
1021 #endif
1022 }
1023 
1024 static int
1025 xfs_ioctl_setattr_xflags(
1026         struct xfs_trans        *tp,
1027         struct xfs_inode        *ip,
1028         struct fsxattr          *fa)
1029 {
1030         struct xfs_mount        *mp = ip->i_mount;
1031         uint64_t                di_flags2;
1032 
1033         /* Can't change realtime flag if any extents are allocated. */
1034         if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
1035             XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & FS_XFLAG_REALTIME))
1036                 return -EINVAL;
1037 
1038         /* If realtime flag is set then must have realtime device */
1039         if (fa->fsx_xflags & FS_XFLAG_REALTIME) {
1040                 if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 ||
1041                     (ip->i_d.di_extsize % mp->m_sb.sb_rextsize))
1042                         return -EINVAL;
1043         }
1044 
1045         /* Clear reflink if we are actually able to set the rt flag. */
1046         if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip))
1047                 ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
1048 
1049         /* Don't allow us to set DAX mode for a reflinked file for now. */
1050         if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip))
1051                 return -EINVAL;
1052 
1053         /*
1054          * Can't modify an immutable/append-only file unless
1055          * we have appropriate permission.
1056          */
1057         if (((ip->i_d.di_flags & (XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND)) ||
1058              (fa->fsx_xflags & (FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND))) &&
1059             !capable(CAP_LINUX_IMMUTABLE))
1060                 return -EPERM;
1061 
1062         /* diflags2 only valid for v3 inodes. */
1063         di_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);
1064         if (di_flags2 && ip->i_d.di_version < 3)
1065                 return -EINVAL;
1066 
1067         ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags);
1068         ip->i_d.di_flags2 = di_flags2;
1069 
1070         xfs_diflags_to_linux(ip);
1071         xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1072         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1073         XFS_STATS_INC(mp, xs_ig_attrchg);
1074         return 0;
1075 }
1076 
1077 /*
1078  * If we are changing DAX flags, we have to ensure the file is clean and any
1079  * cached objects in the address space are invalidated and removed. This
1080  * requires us to lock out other IO and page faults similar to a truncate
1081  * operation. The locks need to be held until the transaction has been committed
1082  * so that the cache invalidation is atomic with respect to the DAX flag
1083  * manipulation.
1084  */
1085 static int
1086 xfs_ioctl_setattr_dax_invalidate(
1087         struct xfs_inode        *ip,
1088         struct fsxattr          *fa,
1089         int                     *join_flags)
1090 {
1091         struct inode            *inode = VFS_I(ip);
1092         struct super_block      *sb = inode->i_sb;
1093         int                     error;
1094 
1095         *join_flags = 0;
1096 
1097         /*
1098          * It is only valid to set the DAX flag on regular files and
1099          * directories on filesystems where the block size is equal to the page
1100          * size. On directories it serves as an inherit hint.
1101          */
1102         if (fa->fsx_xflags & FS_XFLAG_DAX) {
1103                 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
1104                         return -EINVAL;
1105                 if (bdev_dax_supported(sb, sb->s_blocksize) < 0)
1106                         return -EINVAL;
1107         }
1108 
1109         /* If the DAX state is not changing, we have nothing to do here. */
1110         if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode))
1111                 return 0;
1112         if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode))
1113                 return 0;
1114 
1115         /* lock, flush and invalidate mapping in preparation for flag change */
1116         xfs_ilock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
1117         error = filemap_write_and_wait(inode->i_mapping);
1118         if (error)
1119                 goto out_unlock;
1120         error = invalidate_inode_pages2(inode->i_mapping);
1121         if (error)
1122                 goto out_unlock;
1123 
1124         *join_flags = XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL;
1125         return 0;
1126 
1127 out_unlock:
1128         xfs_iunlock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
1129         return error;
1130 
1131 }
1132 
1133 /*
1134  * Set up the transaction structure for the setattr operation, checking that we
1135  * have permission to do so. On success, return a clean transaction and the
1136  * inode locked exclusively ready for further operation specific checks. On
1137  * failure, return an error without modifying or locking the inode.
1138  *
1139  * The inode might already be IO locked on call. If this is the case, it is
1140  * indicated in @join_flags and we take full responsibility for ensuring they
1141  * are unlocked from now on. Hence if we have an error here, we still have to
1142  * unlock them. Otherwise, once they are joined to the transaction, they will
1143  * be unlocked on commit/cancel.
1144  */
1145 static struct xfs_trans *
1146 xfs_ioctl_setattr_get_trans(
1147         struct xfs_inode        *ip,
1148         int                     join_flags)
1149 {
1150         struct xfs_mount        *mp = ip->i_mount;
1151         struct xfs_trans        *tp;
1152         int                     error = -EROFS;
1153 
1154         if (mp->m_flags & XFS_MOUNT_RDONLY)
1155                 goto out_unlock;
1156         error = -EIO;
1157         if (XFS_FORCED_SHUTDOWN(mp))
1158                 goto out_unlock;
1159 
1160         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
1161         if (error)
1162                 return ERR_PTR(error);
1163 
1164         xfs_ilock(ip, XFS_ILOCK_EXCL);
1165         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | join_flags);
1166         join_flags = 0;
1167 
1168         /*
1169          * CAP_FOWNER overrides the following restrictions:
1170          *
1171          * The user ID of the calling process must be equal to the file owner
1172          * ID, except in cases where the CAP_FSETID capability is applicable.
1173          */
1174         if (!inode_owner_or_capable(VFS_I(ip))) {
1175                 error = -EPERM;
1176                 goto out_cancel;
1177         }
1178 
1179         if (mp->m_flags & XFS_MOUNT_WSYNC)
1180                 xfs_trans_set_sync(tp);
1181 
1182         return tp;
1183 
1184 out_cancel:
1185         xfs_trans_cancel(tp);
1186 out_unlock:
1187         if (join_flags)
1188                 xfs_iunlock(ip, join_flags);
1189         return ERR_PTR(error);
1190 }
1191 
1192 /*
1193  * extent size hint validation is somewhat cumbersome. Rules are:
1194  *
1195  * 1. extent size hint is only valid for directories and regular files
1196  * 2. FS_XFLAG_EXTSIZE is only valid for regular files
1197  * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
1198  * 4. can only be changed on regular files if no extents are allocated
1199  * 5. can be changed on directories at any time
1200  * 6. extsize hint of 0 turns off hints, clears inode flags.
1201  * 7. Extent size must be a multiple of the appropriate block size.
1202  * 8. for non-realtime files, the extent size hint must be limited
1203  *    to half the AG size to avoid alignment extending the extent beyond the
1204  *    limits of the AG.
1205  *
1206  * Please keep this function in sync with xfs_scrub_inode_extsize.
1207  */
1208 static int
1209 xfs_ioctl_setattr_check_extsize(
1210         struct xfs_inode        *ip,
1211         struct fsxattr          *fa)
1212 {
1213         struct xfs_mount        *mp = ip->i_mount;
1214 
1215         if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(VFS_I(ip)->i_mode))
1216                 return -EINVAL;
1217 
1218         if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) &&
1219             !S_ISDIR(VFS_I(ip)->i_mode))
1220                 return -EINVAL;
1221 
1222         if (S_ISREG(VFS_I(ip)->i_mode) && ip->i_d.di_nextents &&
1223             ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize))
1224                 return -EINVAL;
1225 
1226         if (fa->fsx_extsize != 0) {
1227                 xfs_extlen_t    size;
1228                 xfs_fsblock_t   extsize_fsb;
1229 
1230                 extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize);
1231                 if (extsize_fsb > MAXEXTLEN)
1232                         return -EINVAL;
1233 
1234                 if (XFS_IS_REALTIME_INODE(ip) ||
1235                     (fa->fsx_xflags & FS_XFLAG_REALTIME)) {
1236                         size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
1237                 } else {
1238                         size = mp->m_sb.sb_blocksize;
1239                         if (extsize_fsb > mp->m_sb.sb_agblocks / 2)
1240                                 return -EINVAL;
1241                 }
1242 
1243                 if (fa->fsx_extsize % size)
1244                         return -EINVAL;
1245         } else
1246                 fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);
1247 
1248         return 0;
1249 }
1250 
1251 /*
1252  * CoW extent size hint validation rules are:
1253  *
1254  * 1. CoW extent size hint can only be set if reflink is enabled on the fs.
1255  *    The inode does not have to have any shared blocks, but it must be a v3.
1256  * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
1257  *    for a directory, the hint is propagated to new files.
1258  * 3. Can be changed on files & directories at any time.
1259  * 4. CoW extsize hint of 0 turns off hints, clears inode flags.
1260  * 5. Extent size must be a multiple of the appropriate block size.
1261  * 6. The extent size hint must be limited to half the AG size to avoid
1262  *    alignment extending the extent beyond the limits of the AG.
1263  *
1264  * Please keep this function in sync with xfs_scrub_inode_cowextsize.
1265  */
1266 static int
1267 xfs_ioctl_setattr_check_cowextsize(
1268         struct xfs_inode        *ip,
1269         struct fsxattr          *fa)
1270 {
1271         struct xfs_mount        *mp = ip->i_mount;
1272 
1273         if (!(fa->fsx_xflags & FS_XFLAG_COWEXTSIZE))
1274                 return 0;
1275 
1276         if (!xfs_sb_version_hasreflink(&ip->i_mount->m_sb) ||
1277             ip->i_d.di_version != 3)
1278                 return -EINVAL;
1279 
1280         if (!S_ISREG(VFS_I(ip)->i_mode) && !S_ISDIR(VFS_I(ip)->i_mode))
1281                 return -EINVAL;
1282 
1283         if (fa->fsx_cowextsize != 0) {
1284                 xfs_extlen_t    size;
1285                 xfs_fsblock_t   cowextsize_fsb;
1286 
1287                 cowextsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_cowextsize);
1288                 if (cowextsize_fsb > MAXEXTLEN)
1289                         return -EINVAL;
1290 
1291                 size = mp->m_sb.sb_blocksize;
1292                 if (cowextsize_fsb > mp->m_sb.sb_agblocks / 2)
1293                         return -EINVAL;
1294 
1295                 if (fa->fsx_cowextsize % size)
1296                         return -EINVAL;
1297         } else
1298                 fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;
1299 
1300         return 0;
1301 }
1302 
1303 static int
1304 xfs_ioctl_setattr_check_projid(
1305         struct xfs_inode        *ip,
1306         struct fsxattr          *fa)
1307 {
1308         /* Disallow 32bit project ids if projid32bit feature is not enabled. */
1309         if (fa->fsx_projid > (uint16_t)-1 &&
1310             !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
1311                 return -EINVAL;
1312 
1313         /*
1314          * Project Quota ID state is only allowed to change from within the init
1315          * namespace. Enforce that restriction only if we are trying to change
1316          * the quota ID state. Everything else is allowed in user namespaces.
1317          */
1318         if (current_user_ns() == &init_user_ns)
1319                 return 0;
1320 
1321         if (xfs_get_projid(ip) != fa->fsx_projid)
1322                 return -EINVAL;
1323         if ((fa->fsx_xflags & FS_XFLAG_PROJINHERIT) !=
1324             (ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
1325                 return -EINVAL;
1326 
1327         return 0;
1328 }
1329 
1330 STATIC int
1331 xfs_ioctl_setattr(
1332         xfs_inode_t             *ip,
1333         struct fsxattr          *fa)
1334 {
1335         struct xfs_mount        *mp = ip->i_mount;
1336         struct xfs_trans        *tp;
1337         struct xfs_dquot        *udqp = NULL;
1338         struct xfs_dquot        *pdqp = NULL;
1339         struct xfs_dquot        *olddquot = NULL;
1340         int                     code;
1341         int                     join_flags = 0;
1342 
1343         trace_xfs_ioctl_setattr(ip);
1344 
1345         code = xfs_ioctl_setattr_check_projid(ip, fa);
1346         if (code)
1347                 return code;
1348 
1349         /*
1350          * If disk quotas is on, we make sure that the dquots do exist on disk,
1351          * before we start any other transactions. Trying to do this later
1352          * is messy. We don't care to take a readlock to look at the ids
1353          * in inode here, because we can't hold it across the trans_reserve.
1354          * If the IDs do change before we take the ilock, we're covered
1355          * because the i_*dquot fields will get updated anyway.
1356          */
1357         if (XFS_IS_QUOTA_ON(mp)) {
1358                 code = xfs_qm_vop_dqalloc(ip, ip->i_d.di_uid,
1359                                          ip->i_d.di_gid, fa->fsx_projid,
1360                                          XFS_QMOPT_PQUOTA, &udqp, NULL, &pdqp);
1361                 if (code)
1362                         return code;
1363         }
1364 
1365         /*
1366          * Changing DAX config may require inode locking for mapping
1367          * invalidation. These need to be held all the way to transaction commit
1368          * or cancel time, so need to be passed through to
1369          * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
1370          * appropriately.
1371          */
1372         code = xfs_ioctl_setattr_dax_invalidate(ip, fa, &join_flags);
1373         if (code)
1374                 goto error_free_dquots;
1375 
1376         tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
1377         if (IS_ERR(tp)) {
1378                 code = PTR_ERR(tp);
1379                 goto error_free_dquots;
1380         }
1381 
1382 
1383         if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) &&
1384             xfs_get_projid(ip) != fa->fsx_projid) {
1385                 code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, pdqp,
1386                                 capable(CAP_FOWNER) ?  XFS_QMOPT_FORCE_RES : 0);
1387                 if (code)       /* out of quota */
1388                         goto error_trans_cancel;
1389         }
1390 
1391         code = xfs_ioctl_setattr_check_extsize(ip, fa);
1392         if (code)
1393                 goto error_trans_cancel;
1394 
1395         code = xfs_ioctl_setattr_check_cowextsize(ip, fa);
1396         if (code)
1397                 goto error_trans_cancel;
1398 
1399         code = xfs_ioctl_setattr_xflags(tp, ip, fa);
1400         if (code)
1401                 goto error_trans_cancel;
1402 
1403         /*
1404          * Change file ownership.  Must be the owner or privileged.  CAP_FSETID
1405          * overrides the following restrictions:
1406          *
1407          * The set-user-ID and set-group-ID bits of a file will be cleared upon
1408          * successful return from chown()
1409          */
1410 
1411         if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) &&
1412             !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID))
1413                 VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID);
1414 
1415         /* Change the ownerships and register project quota modifications */
1416         if (xfs_get_projid(ip) != fa->fsx_projid) {
1417                 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) {
1418                         olddquot = xfs_qm_vop_chown(tp, ip,
1419                                                 &ip->i_pdquot, pdqp);
1420                 }
1421                 ASSERT(ip->i_d.di_version > 1);
1422                 xfs_set_projid(ip, fa->fsx_projid);
1423         }
1424 
1425         /*
1426          * Only set the extent size hint if we've already determined that the
1427          * extent size hint should be set on the inode. If no extent size flags
1428          * are set on the inode then unconditionally clear the extent size hint.
1429          */
1430         if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT))
1431                 ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
1432         else
1433                 ip->i_d.di_extsize = 0;
1434         if (ip->i_d.di_version == 3 &&
1435             (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE))
1436                 ip->i_d.di_cowextsize = fa->fsx_cowextsize >>
1437                                 mp->m_sb.sb_blocklog;
1438         else
1439                 ip->i_d.di_cowextsize = 0;
1440 
1441         code = xfs_trans_commit(tp);
1442 
1443         /*
1444          * Release any dquot(s) the inode had kept before chown.
1445          */
1446         xfs_qm_dqrele(olddquot);
1447         xfs_qm_dqrele(udqp);
1448         xfs_qm_dqrele(pdqp);
1449 
1450         return code;
1451 
1452 error_trans_cancel:
1453         xfs_trans_cancel(tp);
1454 error_free_dquots:
1455         xfs_qm_dqrele(udqp);
1456         xfs_qm_dqrele(pdqp);
1457         return code;
1458 }
1459 
1460 STATIC int
1461 xfs_ioc_fssetxattr(
1462         xfs_inode_t             *ip,
1463         struct file             *filp,
1464         void                    __user *arg)
1465 {
1466         struct fsxattr          fa;
1467         int error;
1468 
1469         if (copy_from_user(&fa, arg, sizeof(fa)))
1470                 return -EFAULT;
1471 
1472         error = mnt_want_write_file(filp);
1473         if (error)
1474                 return error;
1475         error = xfs_ioctl_setattr(ip, &fa);
1476         mnt_drop_write_file(filp);
1477         return error;
1478 }
1479 
1480 STATIC int
1481 xfs_ioc_getxflags(
1482         xfs_inode_t             *ip,
1483         void                    __user *arg)
1484 {
1485         unsigned int            flags;
1486 
1487         flags = xfs_di2lxflags(ip->i_d.di_flags);
1488         if (copy_to_user(arg, &flags, sizeof(flags)))
1489                 return -EFAULT;
1490         return 0;
1491 }
1492 
1493 STATIC int
1494 xfs_ioc_setxflags(
1495         struct xfs_inode        *ip,
1496         struct file             *filp,
1497         void                    __user *arg)
1498 {
1499         struct xfs_trans        *tp;
1500         struct fsxattr          fa;
1501         unsigned int            flags;
1502         int                     join_flags = 0;
1503         int                     error;
1504 
1505         if (copy_from_user(&flags, arg, sizeof(flags)))
1506                 return -EFAULT;
1507 
1508         if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
1509                       FS_NOATIME_FL | FS_NODUMP_FL | \
1510                       FS_SYNC_FL))
1511                 return -EOPNOTSUPP;
1512 
1513         fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
1514 
1515         error = mnt_want_write_file(filp);
1516         if (error)
1517                 return error;
1518 
1519         /*
1520          * Changing DAX config may require inode locking for mapping
1521          * invalidation. These need to be held all the way to transaction commit
1522          * or cancel time, so need to be passed through to
1523          * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
1524          * appropriately.
1525          */
1526         error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags);
1527         if (error)
1528                 goto out_drop_write;
1529 
1530         tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
1531         if (IS_ERR(tp)) {
1532                 error = PTR_ERR(tp);
1533                 goto out_drop_write;
1534         }
1535 
1536         error = xfs_ioctl_setattr_xflags(tp, ip, &fa);
1537         if (error) {
1538                 xfs_trans_cancel(tp);
1539                 goto out_drop_write;
1540         }
1541 
1542         error = xfs_trans_commit(tp);
1543 out_drop_write:
1544         mnt_drop_write_file(filp);
1545         return error;
1546 }
1547 
1548 static bool
1549 xfs_getbmap_format(
1550         struct kgetbmap         *p,
1551         struct getbmapx __user  *u,
1552         size_t                  recsize)
1553 {
1554         if (put_user(p->bmv_offset, &u->bmv_offset) ||
1555             put_user(p->bmv_block, &u->bmv_block) ||
1556             put_user(p->bmv_length, &u->bmv_length) ||
1557             put_user(0, &u->bmv_count) ||
1558             put_user(0, &u->bmv_entries))
1559                 return false;
1560         if (recsize < sizeof(struct getbmapx))
1561                 return true;
1562         if (put_user(0, &u->bmv_iflags) ||
1563             put_user(p->bmv_oflags, &u->bmv_oflags) ||
1564             put_user(0, &u->bmv_unused1) ||
1565             put_user(0, &u->bmv_unused2))
1566                 return false;
1567         return true;
1568 }
1569 
1570 STATIC int
1571 xfs_ioc_getbmap(
1572         struct file             *file,
1573         unsigned int            cmd,
1574         void                    __user *arg)
1575 {
1576         struct getbmapx         bmx = { 0 };
1577         struct kgetbmap         *buf;
1578         size_t                  recsize;
1579         int                     error, i;
1580 
1581         switch (cmd) {
1582         case XFS_IOC_GETBMAPA:
1583                 bmx.bmv_iflags = BMV_IF_ATTRFORK;
1584                 /*FALLTHRU*/
1585         case XFS_IOC_GETBMAP:
1586                 if (file->f_mode & FMODE_NOCMTIME)
1587                         bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
1588                 /* struct getbmap is a strict subset of struct getbmapx. */
1589                 recsize = sizeof(struct getbmap);
1590                 break;
1591         case XFS_IOC_GETBMAPX:
1592                 recsize = sizeof(struct getbmapx);
1593                 break;
1594         default:
1595                 return -EINVAL;
1596         }
1597 
1598         if (copy_from_user(&bmx, arg, recsize))
1599                 return -EFAULT;
1600 
1601         if (bmx.bmv_count < 2)
1602                 return -EINVAL;
1603         if (bmx.bmv_count > ULONG_MAX / recsize)
1604                 return -ENOMEM;
1605 
1606         buf = kmem_zalloc_large(bmx.bmv_count * sizeof(*buf), 0);
1607         if (!buf)
1608                 return -ENOMEM;
1609 
1610         error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, buf);
1611         if (error)
1612                 goto out_free_buf;
1613 
1614         error = -EFAULT;
1615         if (copy_to_user(arg, &bmx, recsize))
1616                 goto out_free_buf;
1617         arg += recsize;
1618 
1619         for (i = 0; i < bmx.bmv_entries; i++) {
1620                 if (!xfs_getbmap_format(buf + i, arg, recsize))
1621                         goto out_free_buf;
1622                 arg += recsize;
1623         }
1624 
1625         error = 0;
1626 out_free_buf:
1627         kmem_free(buf);
1628         return 0;
1629 }
1630 
1631 struct getfsmap_info {
1632         struct xfs_mount        *mp;
1633         struct fsmap_head __user *data;
1634         unsigned int            idx;
1635         __u32                   last_flags;
1636 };
1637 
1638 STATIC int
1639 xfs_getfsmap_format(struct xfs_fsmap *xfm, void *priv)
1640 {
1641         struct getfsmap_info    *info = priv;
1642         struct fsmap            fm;
1643 
1644         trace_xfs_getfsmap_mapping(info->mp, xfm);
1645 
1646         info->last_flags = xfm->fmr_flags;
1647         xfs_fsmap_from_internal(&fm, xfm);
1648         if (copy_to_user(&info->data->fmh_recs[info->idx++], &fm,
1649                         sizeof(struct fsmap)))
1650                 return -EFAULT;
1651 
1652         return 0;
1653 }
1654 
1655 STATIC int
1656 xfs_ioc_getfsmap(
1657         struct xfs_inode        *ip,
1658         struct fsmap_head       __user *arg)
1659 {
1660         struct getfsmap_info    info = { NULL };
1661         struct xfs_fsmap_head   xhead = {0};
1662         struct fsmap_head       head;
1663         bool                    aborted = false;
1664         int                     error;
1665 
1666         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
1667                 return -EFAULT;
1668         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
1669             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
1670                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
1671             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
1672                        sizeof(head.fmh_keys[1].fmr_reserved)))
1673                 return -EINVAL;
1674 
1675         xhead.fmh_iflags = head.fmh_iflags;
1676         xhead.fmh_count = head.fmh_count;
1677         xfs_fsmap_to_internal(&xhead.fmh_keys[0], &head.fmh_keys[0]);
1678         xfs_fsmap_to_internal(&xhead.fmh_keys[1], &head.fmh_keys[1]);
1679 
1680         trace_xfs_getfsmap_low_key(ip->i_mount, &xhead.fmh_keys[0]);
1681         trace_xfs_getfsmap_high_key(ip->i_mount, &xhead.fmh_keys[1]);
1682 
1683         info.mp = ip->i_mount;
1684         info.data = arg;
1685         error = xfs_getfsmap(ip->i_mount, &xhead, xfs_getfsmap_format, &info);
1686         if (error == XFS_BTREE_QUERY_RANGE_ABORT) {
1687                 error = 0;
1688                 aborted = true;
1689         } else if (error)
1690                 return error;
1691 
1692         /* If we didn't abort, set the "last" flag in the last fmx */
1693         if (!aborted && info.idx) {
1694                 info.last_flags |= FMR_OF_LAST;
1695                 if (copy_to_user(&info.data->fmh_recs[info.idx - 1].fmr_flags,
1696                                 &info.last_flags, sizeof(info.last_flags)))
1697                         return -EFAULT;
1698         }
1699 
1700         /* copy back header */
1701         head.fmh_entries = xhead.fmh_entries;
1702         head.fmh_oflags = xhead.fmh_oflags;
1703         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
1704                 return -EFAULT;
1705 
1706         return 0;
1707 }
1708 
1709 STATIC int
1710 xfs_ioc_scrub_metadata(
1711         struct xfs_inode                *ip,
1712         void                            __user *arg)
1713 {
1714         struct xfs_scrub_metadata       scrub;
1715         int                             error;
1716 
1717         if (!capable(CAP_SYS_ADMIN))
1718                 return -EPERM;
1719 
1720         if (copy_from_user(&scrub, arg, sizeof(scrub)))
1721                 return -EFAULT;
1722 
1723         error = xfs_scrub_metadata(ip, &scrub);
1724         if (error)
1725                 return error;
1726 
1727         if (copy_to_user(arg, &scrub, sizeof(scrub)))
1728                 return -EFAULT;
1729 
1730         return 0;
1731 }
1732 
1733 int
1734 xfs_ioc_swapext(
1735         xfs_swapext_t   *sxp)
1736 {
1737         xfs_inode_t     *ip, *tip;
1738         struct fd       f, tmp;
1739         int             error = 0;
1740 
1741         /* Pull information for the target fd */
1742         f = fdget((int)sxp->sx_fdtarget);
1743         if (!f.file) {
1744                 error = -EINVAL;
1745                 goto out;
1746         }
1747 
1748         if (!(f.file->f_mode & FMODE_WRITE) ||
1749             !(f.file->f_mode & FMODE_READ) ||
1750             (f.file->f_flags & O_APPEND)) {
1751                 error = -EBADF;
1752                 goto out_put_file;
1753         }
1754 
1755         tmp = fdget((int)sxp->sx_fdtmp);
1756         if (!tmp.file) {
1757                 error = -EINVAL;
1758                 goto out_put_file;
1759         }
1760 
1761         if (!(tmp.file->f_mode & FMODE_WRITE) ||
1762             !(tmp.file->f_mode & FMODE_READ) ||
1763             (tmp.file->f_flags & O_APPEND)) {
1764                 error = -EBADF;
1765                 goto out_put_tmp_file;
1766         }
1767 
1768         if (IS_SWAPFILE(file_inode(f.file)) ||
1769             IS_SWAPFILE(file_inode(tmp.file))) {
1770                 error = -EINVAL;
1771                 goto out_put_tmp_file;
1772         }
1773 
1774         /*
1775          * We need to ensure that the fds passed in point to XFS inodes
1776          * before we cast and access them as XFS structures as we have no
1777          * control over what the user passes us here.
1778          */
1779         if (f.file->f_op != &xfs_file_operations ||
1780             tmp.file->f_op != &xfs_file_operations) {
1781                 error = -EINVAL;
1782                 goto out_put_tmp_file;
1783         }
1784 
1785         ip = XFS_I(file_inode(f.file));
1786         tip = XFS_I(file_inode(tmp.file));
1787 
1788         if (ip->i_mount != tip->i_mount) {
1789                 error = -EINVAL;
1790                 goto out_put_tmp_file;
1791         }
1792 
1793         if (ip->i_ino == tip->i_ino) {
1794                 error = -EINVAL;
1795                 goto out_put_tmp_file;
1796         }
1797 
1798         if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
1799                 error = -EIO;
1800                 goto out_put_tmp_file;
1801         }
1802 
1803         error = xfs_swap_extents(ip, tip, sxp);
1804 
1805  out_put_tmp_file:
1806         fdput(tmp);
1807  out_put_file:
1808         fdput(f);
1809  out:
1810         return error;
1811 }
1812 
1813 /*
1814  * Note: some of the ioctl's return positive numbers as a
1815  * byte count indicating success, such as readlink_by_handle.
1816  * So we don't "sign flip" like most other routines.  This means
1817  * true errors need to be returned as a negative value.
1818  */
1819 long
1820 xfs_file_ioctl(
1821         struct file             *filp,
1822         unsigned int            cmd,
1823         unsigned long           p)
1824 {
1825         struct inode            *inode = file_inode(filp);
1826         struct xfs_inode        *ip = XFS_I(inode);
1827         struct xfs_mount        *mp = ip->i_mount;
1828         void                    __user *arg = (void __user *)p;
1829         int                     error;
1830 
1831         trace_xfs_file_ioctl(ip);
1832 
1833         switch (cmd) {
1834         case FITRIM:
1835                 return xfs_ioc_trim(mp, arg);
1836         case XFS_IOC_ALLOCSP:
1837         case XFS_IOC_FREESP:
1838         case XFS_IOC_RESVSP:
1839         case XFS_IOC_UNRESVSP:
1840         case XFS_IOC_ALLOCSP64:
1841         case XFS_IOC_FREESP64:
1842         case XFS_IOC_RESVSP64:
1843         case XFS_IOC_UNRESVSP64:
1844         case XFS_IOC_ZERO_RANGE: {
1845                 xfs_flock64_t           bf;
1846 
1847                 if (copy_from_user(&bf, arg, sizeof(bf)))
1848                         return -EFAULT;
1849                 return xfs_ioc_space(filp, cmd, &bf);
1850         }
1851         case XFS_IOC_DIOINFO: {
1852                 struct dioattr  da;
1853                 xfs_buftarg_t   *target =
1854                         XFS_IS_REALTIME_INODE(ip) ?
1855                         mp->m_rtdev_targp : mp->m_ddev_targp;
1856 
1857                 da.d_mem =  da.d_miniosz = target->bt_logical_sectorsize;
1858                 da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
1859 
1860                 if (copy_to_user(arg, &da, sizeof(da)))
1861                         return -EFAULT;
1862                 return 0;
1863         }
1864 
1865         case XFS_IOC_FSBULKSTAT_SINGLE:
1866         case XFS_IOC_FSBULKSTAT:
1867         case XFS_IOC_FSINUMBERS:
1868                 return xfs_ioc_bulkstat(mp, cmd, arg);
1869 
1870         case XFS_IOC_FSGEOMETRY_V1:
1871                 return xfs_ioc_fsgeometry_v1(mp, arg);
1872 
1873         case XFS_IOC_FSGEOMETRY:
1874                 return xfs_ioc_fsgeometry(mp, arg);
1875 
1876         case XFS_IOC_GETVERSION:
1877                 return put_user(inode->i_generation, (int __user *)arg);
1878 
1879         case XFS_IOC_FSGETXATTR:
1880                 return xfs_ioc_fsgetxattr(ip, 0, arg);
1881         case XFS_IOC_FSGETXATTRA:
1882                 return xfs_ioc_fsgetxattr(ip, 1, arg);
1883         case XFS_IOC_FSSETXATTR:
1884                 return xfs_ioc_fssetxattr(ip, filp, arg);
1885         case XFS_IOC_GETXFLAGS:
1886                 return xfs_ioc_getxflags(ip, arg);
1887         case XFS_IOC_SETXFLAGS:
1888                 return xfs_ioc_setxflags(ip, filp, arg);
1889 
1890         case XFS_IOC_FSSETDM: {
1891                 struct fsdmidata        dmi;
1892 
1893                 if (copy_from_user(&dmi, arg, sizeof(dmi)))
1894                         return -EFAULT;
1895 
1896                 error = mnt_want_write_file(filp);
1897                 if (error)
1898                         return error;
1899 
1900                 error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
1901                                 dmi.fsd_dmstate);
1902                 mnt_drop_write_file(filp);
1903                 return error;
1904         }
1905 
1906         case XFS_IOC_GETBMAP:
1907         case XFS_IOC_GETBMAPA:
1908         case XFS_IOC_GETBMAPX:
1909                 return xfs_ioc_getbmap(filp, cmd, arg);
1910 
1911         case FS_IOC_GETFSMAP:
1912                 return xfs_ioc_getfsmap(ip, arg);
1913 
1914         case XFS_IOC_SCRUB_METADATA:
1915                 return xfs_ioc_scrub_metadata(ip, arg);
1916 
1917         case XFS_IOC_FD_TO_HANDLE:
1918         case XFS_IOC_PATH_TO_HANDLE:
1919         case XFS_IOC_PATH_TO_FSHANDLE: {
1920                 xfs_fsop_handlereq_t    hreq;
1921 
1922                 if (copy_from_user(&hreq, arg, sizeof(hreq)))
1923                         return -EFAULT;
1924                 return xfs_find_handle(cmd, &hreq);
1925         }
1926         case XFS_IOC_OPEN_BY_HANDLE: {
1927                 xfs_fsop_handlereq_t    hreq;
1928 
1929                 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1930                         return -EFAULT;
1931                 return xfs_open_by_handle(filp, &hreq);
1932         }
1933         case XFS_IOC_FSSETDM_BY_HANDLE:
1934                 return xfs_fssetdm_by_handle(filp, arg);
1935 
1936         case XFS_IOC_READLINK_BY_HANDLE: {
1937                 xfs_fsop_handlereq_t    hreq;
1938 
1939                 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
1940                         return -EFAULT;
1941                 return xfs_readlink_by_handle(filp, &hreq);
1942         }
1943         case XFS_IOC_ATTRLIST_BY_HANDLE:
1944                 return xfs_attrlist_by_handle(filp, arg);
1945 
1946         case XFS_IOC_ATTRMULTI_BY_HANDLE:
1947                 return xfs_attrmulti_by_handle(filp, arg);
1948 
1949         case XFS_IOC_SWAPEXT: {
1950                 struct xfs_swapext      sxp;
1951 
1952                 if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
1953                         return -EFAULT;
1954                 error = mnt_want_write_file(filp);
1955                 if (error)
1956                         return error;
1957                 error = xfs_ioc_swapext(&sxp);
1958                 mnt_drop_write_file(filp);
1959                 return error;
1960         }
1961 
1962         case XFS_IOC_FSCOUNTS: {
1963                 xfs_fsop_counts_t out;
1964 
1965                 error = xfs_fs_counts(mp, &out);
1966                 if (error)
1967                         return error;
1968 
1969                 if (copy_to_user(arg, &out, sizeof(out)))
1970                         return -EFAULT;
1971                 return 0;
1972         }
1973 
1974         case XFS_IOC_SET_RESBLKS: {
1975                 xfs_fsop_resblks_t inout;
1976                 uint64_t           in;
1977 
1978                 if (!capable(CAP_SYS_ADMIN))
1979                         return -EPERM;
1980 
1981                 if (mp->m_flags & XFS_MOUNT_RDONLY)
1982                         return -EROFS;
1983 
1984                 if (copy_from_user(&inout, arg, sizeof(inout)))
1985                         return -EFAULT;
1986 
1987                 error = mnt_want_write_file(filp);
1988                 if (error)
1989                         return error;
1990 
1991                 /* input parameter is passed in resblks field of structure */
1992                 in = inout.resblks;
1993                 error = xfs_reserve_blocks(mp, &in, &inout);
1994                 mnt_drop_write_file(filp);
1995                 if (error)
1996                         return error;
1997 
1998                 if (copy_to_user(arg, &inout, sizeof(inout)))
1999                         return -EFAULT;
2000                 return 0;
2001         }
2002 
2003         case XFS_IOC_GET_RESBLKS: {
2004                 xfs_fsop_resblks_t out;
2005 
2006                 if (!capable(CAP_SYS_ADMIN))
2007                         return -EPERM;
2008 
2009                 error = xfs_reserve_blocks(mp, NULL, &out);
2010                 if (error)
2011                         return error;
2012 
2013                 if (copy_to_user(arg, &out, sizeof(out)))
2014                         return -EFAULT;
2015 
2016                 return 0;
2017         }
2018 
2019         case XFS_IOC_FSGROWFSDATA: {
2020                 xfs_growfs_data_t in;
2021 
2022                 if (copy_from_user(&in, arg, sizeof(in)))
2023                         return -EFAULT;
2024 
2025                 error = mnt_want_write_file(filp);
2026                 if (error)
2027                         return error;
2028                 error = xfs_growfs_data(mp, &in);
2029                 mnt_drop_write_file(filp);
2030                 return error;
2031         }
2032 
2033         case XFS_IOC_FSGROWFSLOG: {
2034                 xfs_growfs_log_t in;
2035 
2036                 if (copy_from_user(&in, arg, sizeof(in)))
2037                         return -EFAULT;
2038 
2039                 error = mnt_want_write_file(filp);
2040                 if (error)
2041                         return error;
2042                 error = xfs_growfs_log(mp, &in);
2043                 mnt_drop_write_file(filp);
2044                 return error;
2045         }
2046 
2047         case XFS_IOC_FSGROWFSRT: {
2048                 xfs_growfs_rt_t in;
2049 
2050                 if (copy_from_user(&in, arg, sizeof(in)))
2051                         return -EFAULT;
2052 
2053                 error = mnt_want_write_file(filp);
2054                 if (error)
2055                         return error;
2056                 error = xfs_growfs_rt(mp, &in);
2057                 mnt_drop_write_file(filp);
2058                 return error;
2059         }
2060 
2061         case XFS_IOC_GOINGDOWN: {
2062                 uint32_t in;
2063 
2064                 if (!capable(CAP_SYS_ADMIN))
2065                         return -EPERM;
2066 
2067                 if (get_user(in, (uint32_t __user *)arg))
2068                         return -EFAULT;
2069 
2070                 return xfs_fs_goingdown(mp, in);
2071         }
2072 
2073         case XFS_IOC_ERROR_INJECTION: {
2074                 xfs_error_injection_t in;
2075 
2076                 if (!capable(CAP_SYS_ADMIN))
2077                         return -EPERM;
2078 
2079                 if (copy_from_user(&in, arg, sizeof(in)))
2080                         return -EFAULT;
2081 
2082                 return xfs_errortag_add(mp, in.errtag);
2083         }
2084 
2085         case XFS_IOC_ERROR_CLEARALL:
2086                 if (!capable(CAP_SYS_ADMIN))
2087                         return -EPERM;
2088 
2089                 return xfs_errortag_clearall(mp);
2090 
2091         case XFS_IOC_FREE_EOFBLOCKS: {
2092                 struct xfs_fs_eofblocks eofb;
2093                 struct xfs_eofblocks keofb;
2094 
2095                 if (!capable(CAP_SYS_ADMIN))
2096                         return -EPERM;
2097 
2098                 if (mp->m_flags & XFS_MOUNT_RDONLY)
2099                         return -EROFS;
2100 
2101                 if (copy_from_user(&eofb, arg, sizeof(eofb)))
2102                         return -EFAULT;
2103 
2104                 error = xfs_fs_eofblocks_from_user(&eofb, &keofb);
2105                 if (error)
2106                         return error;
2107 
2108                 return xfs_icache_free_eofblocks(mp, &keofb);
2109         }
2110 
2111         default:
2112                 return -ENOTTY;
2113         }
2114 }
2115 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp