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Linux/fs/xfs/xfs_ioctl.c

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

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