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/fs/xfs/xfs_ioctl.c

https://bitbucket.org/emiliolopez/linux
C | 2114 lines | 1577 code | 330 blank | 207 comment | 329 complexity | 45ce01e4f9613b6ca56f5ed02c85898b MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
   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 */
  69int
  70xfs_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 */
 146STATIC int
 147xfs_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 */
 157struct dentry *
 158xfs_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
 189STATIC struct dentry *
 190xfs_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
 197int
 198xfs_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
 277int
 278xfs_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
 311int
 312xfs_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
 343STATIC int
 344xfs_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
 387STATIC int
 388xfs_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
 435out_kfree:
 436	kmem_free(kbuf);
 437out_dput:
 438	dput(dentry);
 439	return error;
 440}
 441
 442int
 443xfs_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
 466out_kfree:
 467	kmem_free(kbuf);
 468	return error;
 469}
 470
 471int
 472xfs_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
 498int
 499xfs_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
 514STATIC int
 515xfs_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
 606int
 607xfs_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
 739out_unlock:
 740	xfs_iunlock(ip, iolock);
 741	mnt_drop_write_file(filp);
 742	return error;
 743}
 744
 745STATIC int
 746xfs_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
 804STATIC int
 805xfs_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
 826STATIC int
 827xfs_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
 847STATIC unsigned int
 848xfs_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
 878STATIC unsigned int
 879xfs_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
 897STATIC int
 898xfs_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
 935STATIC uint16_t
 936xfs_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
 977STATIC uint64_t
 978xfs_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
 993STATIC void
 994xfs_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
1024static int
1025xfs_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 */
1085static int
1086xfs_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
1127out_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 */
1145static struct xfs_trans *
1146xfs_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
1184out_cancel:
1185	xfs_trans_cancel(tp);
1186out_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 */
1208static int
1209xfs_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 */
1266static int
1267xfs_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
1303static int
1304xfs_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
1330STATIC int
1331xfs_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
1452error_trans_cancel:
1453	xfs_trans_cancel(tp);
1454error_free_dquots:
1455	xfs_qm_dqrele(udqp);
1456	xfs_qm_dqrele(pdqp);
1457	return code;
1458}
1459
1460STATIC int
1461xfs_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
1480STATIC int
1481xfs_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
1493STATIC int
1494xfs_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);
1543out_drop_write:
1544	mnt_drop_write_file(filp);
1545	return error;
1546}
1547
1548static bool
1549xfs_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
1570STATIC int
1571xfs_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;
1626out_free_buf:
1627	kmem_free(buf);
1628	return 0;
1629}
1630
1631struct getfsmap_info {
1632	struct xfs_mount	*mp;
1633	struct fsmap_head __user *data;
1634	unsigned int		idx;
1635	__u32			last_flags;
1636};
1637
1638STATIC int
1639xfs_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
1655STATIC int
1656xfs_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
1709STATIC int
1710xfs_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
1733int
1734xfs_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 */
1819long
1820xfs_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}