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_acl.h"
  15#include "xfs_quota.h"
  16#include "xfs_da_format.h"
  17#include "xfs_da_btree.h"
  18#include "xfs_attr.h"
  19#include "xfs_trans.h"
  20#include "xfs_trace.h"
  21#include "xfs_icache.h"
  22#include "xfs_symlink.h"
  23#include "xfs_dir2.h"
  24#include "xfs_iomap.h"
  25#include "xfs_error.h"
  26#include "xfs_ioctl.h"
  27#include "xfs_xattr.h"
  28
  29#include <linux/posix_acl.h>
  30#include <linux/security.h>
  31#include <linux/iversion.h>
  32#include <linux/fiemap.h>
  33
  34/*
  35 * Directories have different lock order w.r.t. mmap_lock compared to regular
  36 * files. This is due to readdir potentially triggering page faults on a user
  37 * buffer inside filldir(), and this happens with the ilock on the directory
  38 * held. For regular files, the lock order is the other way around - the
  39 * mmap_lock is taken during the page fault, and then we lock the ilock to do
  40 * block mapping. Hence we need a different class for the directory ilock so
  41 * that lockdep can tell them apart.
  42 */
  43static struct lock_class_key xfs_nondir_ilock_class;
  44static struct lock_class_key xfs_dir_ilock_class;
  45
  46static int
  47xfs_initxattrs(
  48	struct inode		*inode,
  49	const struct xattr	*xattr_array,
  50	void			*fs_info)
  51{
  52	const struct xattr	*xattr;
  53	struct xfs_inode	*ip = XFS_I(inode);
  54	int			error = 0;
  55
  56	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  57		struct xfs_da_args	args = {
  58			.dp		= ip,
  59			.attr_filter	= XFS_ATTR_SECURE,
  60			.name		= xattr->name,
  61			.namelen	= strlen(xattr->name),
  62			.value		= xattr->value,
  63			.valuelen	= xattr->value_len,
  64		};
  65		error = xfs_attr_change(&args);
  66		if (error < 0)
  67			break;
  68	}
  69	return error;
  70}
  71
  72/*
  73 * Hook in SELinux.  This is not quite correct yet, what we really need
  74 * here (as we do for default ACLs) is a mechanism by which creation of
  75 * these attrs can be journalled at inode creation time (along with the
  76 * inode, of course, such that log replay can't cause these to be lost).
  77 */
  78int
  79xfs_inode_init_security(
  80	struct inode	*inode,
  81	struct inode	*dir,
  82	const struct qstr *qstr)
  83{
  84	return security_inode_init_security(inode, dir, qstr,
  85					     &xfs_initxattrs, NULL);
  86}
  87
  88static void
  89xfs_dentry_to_name(
  90	struct xfs_name	*namep,
  91	struct dentry	*dentry)
  92{
  93	namep->name = dentry->d_name.name;
  94	namep->len = dentry->d_name.len;
  95	namep->type = XFS_DIR3_FT_UNKNOWN;
  96}
  97
  98static int
  99xfs_dentry_mode_to_name(
 100	struct xfs_name	*namep,
 101	struct dentry	*dentry,
 102	int		mode)
 103{
 104	namep->name = dentry->d_name.name;
 105	namep->len = dentry->d_name.len;
 106	namep->type = xfs_mode_to_ftype(mode);
 107
 108	if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
 109		return -EFSCORRUPTED;
 110
 111	return 0;
 112}
 113
 114STATIC void
 115xfs_cleanup_inode(
 116	struct inode	*dir,
 117	struct inode	*inode,
 118	struct dentry	*dentry)
 119{
 120	struct xfs_name	teardown;
 121
 122	/* Oh, the horror.
 123	 * If we can't add the ACL or we fail in
 124	 * xfs_inode_init_security we must back out.
 125	 * ENOSPC can hit here, among other things.
 126	 */
 127	xfs_dentry_to_name(&teardown, dentry);
 128
 129	xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
 130}
 131
 132/*
 133 * Check to see if we are likely to need an extended attribute to be added to
 134 * the inode we are about to allocate. This allows the attribute fork to be
 135 * created during the inode allocation, reducing the number of transactions we
 136 * need to do in this fast path.
 137 *
 138 * The security checks are optimistic, but not guaranteed. The two LSMs that
 139 * require xattrs to be added here (selinux and smack) are also the only two
 140 * LSMs that add a sb->s_security structure to the superblock. Hence if security
 141 * is enabled and sb->s_security is set, we have a pretty good idea that we are
 142 * going to be asked to add a security xattr immediately after allocating the
 143 * xfs inode and instantiating the VFS inode.
 144 */
 145static inline bool
 146xfs_create_need_xattr(
 147	struct inode	*dir,
 148	struct posix_acl *default_acl,
 149	struct posix_acl *acl)
 150{
 151	if (acl)
 152		return true;
 153	if (default_acl)
 154		return true;
 155#if IS_ENABLED(CONFIG_SECURITY)
 156	if (dir->i_sb->s_security)
 157		return true;
 158#endif
 159	return false;
 160}
 161
 162
 163STATIC int
 164xfs_generic_create(
 165	struct mnt_idmap	*idmap,
 166	struct inode		*dir,
 167	struct dentry		*dentry,
 168	umode_t			mode,
 169	dev_t			rdev,
 170	struct file		*tmpfile)	/* unnamed file */
 171{
 172	struct inode	*inode;
 173	struct xfs_inode *ip = NULL;
 174	struct posix_acl *default_acl, *acl;
 175	struct xfs_name	name;
 176	int		error;
 177
 178	/*
 179	 * Irix uses Missed'em'V split, but doesn't want to see
 180	 * the upper 5 bits of (14bit) major.
 181	 */
 182	if (S_ISCHR(mode) || S_ISBLK(mode)) {
 183		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
 184			return -EINVAL;
 185	} else {
 186		rdev = 0;
 187	}
 188
 189	error = posix_acl_create(dir, &mode, &default_acl, &acl);
 190	if (error)
 191		return error;
 192
 193	/* Verify mode is valid also for tmpfile case */
 194	error = xfs_dentry_mode_to_name(&name, dentry, mode);
 195	if (unlikely(error))
 196		goto out_free_acl;
 197
 198	if (!tmpfile) {
 199		error = xfs_create(idmap, XFS_I(dir), &name, mode, rdev,
 200				xfs_create_need_xattr(dir, default_acl, acl),
 201				&ip);
 202	} else {
 203		error = xfs_create_tmpfile(idmap, XFS_I(dir), mode, &ip);
 204	}
 205	if (unlikely(error))
 206		goto out_free_acl;
 207
 208	inode = VFS_I(ip);
 209
 210	error = xfs_inode_init_security(inode, dir, &dentry->d_name);
 211	if (unlikely(error))
 212		goto out_cleanup_inode;
 213
 214	if (default_acl) {
 215		error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 216		if (error)
 217			goto out_cleanup_inode;
 218	}
 219	if (acl) {
 220		error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
 221		if (error)
 222			goto out_cleanup_inode;
 223	}
 224
 225	xfs_setup_iops(ip);
 226
 227	if (tmpfile) {
 228		/*
 229		 * The VFS requires that any inode fed to d_tmpfile must have
 230		 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
 231		 * However, we created the temp file with nlink == 0 because
 232		 * we're not allowed to put an inode with nlink > 0 on the
 233		 * unlinked list.  Therefore we have to set nlink to 1 so that
 234		 * d_tmpfile can immediately set it back to zero.
 235		 */
 236		set_nlink(inode, 1);
 237		d_tmpfile(tmpfile, inode);
 238	} else
 239		d_instantiate(dentry, inode);
 240
 241	xfs_finish_inode_setup(ip);
 242
 243 out_free_acl:
 244	posix_acl_release(default_acl);
 245	posix_acl_release(acl);
 246	return error;
 247
 248 out_cleanup_inode:
 249	xfs_finish_inode_setup(ip);
 250	if (!tmpfile)
 251		xfs_cleanup_inode(dir, inode, dentry);
 252	xfs_irele(ip);
 253	goto out_free_acl;
 254}
 255
 256STATIC int
 257xfs_vn_mknod(
 258	struct mnt_idmap	*idmap,
 259	struct inode		*dir,
 260	struct dentry		*dentry,
 261	umode_t			mode,
 262	dev_t			rdev)
 263{
 264	return xfs_generic_create(idmap, dir, dentry, mode, rdev, NULL);
 265}
 266
 267STATIC int
 268xfs_vn_create(
 269	struct mnt_idmap	*idmap,
 270	struct inode		*dir,
 271	struct dentry		*dentry,
 272	umode_t			mode,
 273	bool			flags)
 274{
 275	return xfs_generic_create(idmap, dir, dentry, mode, 0, NULL);
 276}
 277
 278STATIC int
 279xfs_vn_mkdir(
 280	struct mnt_idmap	*idmap,
 281	struct inode		*dir,
 282	struct dentry		*dentry,
 283	umode_t			mode)
 284{
 285	return xfs_generic_create(idmap, dir, dentry, mode | S_IFDIR, 0, NULL);
 
 286}
 287
 288STATIC struct dentry *
 289xfs_vn_lookup(
 290	struct inode	*dir,
 291	struct dentry	*dentry,
 292	unsigned int flags)
 293{
 294	struct inode *inode;
 295	struct xfs_inode *cip;
 296	struct xfs_name	name;
 297	int		error;
 298
 299	if (dentry->d_name.len >= MAXNAMELEN)
 300		return ERR_PTR(-ENAMETOOLONG);
 301
 302	xfs_dentry_to_name(&name, dentry);
 303	error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
 304	if (likely(!error))
 305		inode = VFS_I(cip);
 306	else if (likely(error == -ENOENT))
 307		inode = NULL;
 308	else
 309		inode = ERR_PTR(error);
 310	return d_splice_alias(inode, dentry);
 311}
 312
 313STATIC struct dentry *
 314xfs_vn_ci_lookup(
 315	struct inode	*dir,
 316	struct dentry	*dentry,
 317	unsigned int flags)
 318{
 319	struct xfs_inode *ip;
 320	struct xfs_name	xname;
 321	struct xfs_name ci_name;
 322	struct qstr	dname;
 323	int		error;
 324
 325	if (dentry->d_name.len >= MAXNAMELEN)
 326		return ERR_PTR(-ENAMETOOLONG);
 327
 328	xfs_dentry_to_name(&xname, dentry);
 329	error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
 330	if (unlikely(error)) {
 331		if (unlikely(error != -ENOENT))
 332			return ERR_PTR(error);
 333		/*
 334		 * call d_add(dentry, NULL) here when d_drop_negative_children
 335		 * is called in xfs_vn_mknod (ie. allow negative dentries
 336		 * with CI filesystems).
 337		 */
 338		return NULL;
 339	}
 340
 341	/* if exact match, just splice and exit */
 342	if (!ci_name.name)
 343		return d_splice_alias(VFS_I(ip), dentry);
 344
 345	/* else case-insensitive match... */
 346	dname.name = ci_name.name;
 347	dname.len = ci_name.len;
 348	dentry = d_add_ci(dentry, VFS_I(ip), &dname);
 349	kmem_free(ci_name.name);
 350	return dentry;
 351}
 352
 353STATIC int
 354xfs_vn_link(
 355	struct dentry	*old_dentry,
 356	struct inode	*dir,
 357	struct dentry	*dentry)
 358{
 359	struct inode	*inode = d_inode(old_dentry);
 360	struct xfs_name	name;
 361	int		error;
 362
 363	error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
 364	if (unlikely(error))
 365		return error;
 366
 367	error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
 368	if (unlikely(error))
 369		return error;
 370
 371	ihold(inode);
 372	d_instantiate(dentry, inode);
 373	return 0;
 374}
 375
 376STATIC int
 377xfs_vn_unlink(
 378	struct inode	*dir,
 379	struct dentry	*dentry)
 380{
 381	struct xfs_name	name;
 382	int		error;
 383
 384	xfs_dentry_to_name(&name, dentry);
 385
 386	error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
 387	if (error)
 388		return error;
 389
 390	/*
 391	 * With unlink, the VFS makes the dentry "negative": no inode,
 392	 * but still hashed. This is incompatible with case-insensitive
 393	 * mode, so invalidate (unhash) the dentry in CI-mode.
 394	 */
 395	if (xfs_has_asciici(XFS_M(dir->i_sb)))
 396		d_invalidate(dentry);
 397	return 0;
 398}
 399
 400STATIC int
 401xfs_vn_symlink(
 402	struct mnt_idmap	*idmap,
 403	struct inode		*dir,
 404	struct dentry		*dentry,
 405	const char		*symname)
 406{
 407	struct inode	*inode;
 408	struct xfs_inode *cip = NULL;
 409	struct xfs_name	name;
 410	int		error;
 411	umode_t		mode;
 412
 413	mode = S_IFLNK |
 414		(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
 415	error = xfs_dentry_mode_to_name(&name, dentry, mode);
 416	if (unlikely(error))
 417		goto out;
 418
 419	error = xfs_symlink(idmap, XFS_I(dir), &name, symname, mode, &cip);
 420	if (unlikely(error))
 421		goto out;
 422
 423	inode = VFS_I(cip);
 424
 425	error = xfs_inode_init_security(inode, dir, &dentry->d_name);
 426	if (unlikely(error))
 427		goto out_cleanup_inode;
 428
 429	xfs_setup_iops(cip);
 430
 431	d_instantiate(dentry, inode);
 432	xfs_finish_inode_setup(cip);
 433	return 0;
 434
 435 out_cleanup_inode:
 436	xfs_finish_inode_setup(cip);
 437	xfs_cleanup_inode(dir, inode, dentry);
 438	xfs_irele(cip);
 439 out:
 440	return error;
 441}
 442
 443STATIC int
 444xfs_vn_rename(
 445	struct mnt_idmap	*idmap,
 446	struct inode		*odir,
 447	struct dentry		*odentry,
 448	struct inode		*ndir,
 449	struct dentry		*ndentry,
 450	unsigned int		flags)
 451{
 452	struct inode	*new_inode = d_inode(ndentry);
 453	int		omode = 0;
 454	int		error;
 455	struct xfs_name	oname;
 456	struct xfs_name	nname;
 457
 458	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 459		return -EINVAL;
 460
 461	/* if we are exchanging files, we need to set i_mode of both files */
 462	if (flags & RENAME_EXCHANGE)
 463		omode = d_inode(ndentry)->i_mode;
 464
 465	error = xfs_dentry_mode_to_name(&oname, odentry, omode);
 466	if (omode && unlikely(error))
 467		return error;
 468
 469	error = xfs_dentry_mode_to_name(&nname, ndentry,
 470					d_inode(odentry)->i_mode);
 471	if (unlikely(error))
 472		return error;
 473
 474	return xfs_rename(idmap, XFS_I(odir), &oname,
 475			  XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
 476			  new_inode ? XFS_I(new_inode) : NULL, flags);
 477}
 478
 479/*
 480 * careful here - this function can get called recursively, so
 481 * we need to be very careful about how much stack we use.
 482 * uio is kmalloced for this reason...
 483 */
 484STATIC const char *
 485xfs_vn_get_link(
 486	struct dentry		*dentry,
 487	struct inode		*inode,
 488	struct delayed_call	*done)
 489{
 490	char			*link;
 491	int			error = -ENOMEM;
 492
 493	if (!dentry)
 494		return ERR_PTR(-ECHILD);
 495
 496	link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
 497	if (!link)
 498		goto out_err;
 499
 500	error = xfs_readlink(XFS_I(d_inode(dentry)), link);
 501	if (unlikely(error))
 502		goto out_kfree;
 503
 504	set_delayed_call(done, kfree_link, link);
 505	return link;
 506
 507 out_kfree:
 508	kfree(link);
 509 out_err:
 510	return ERR_PTR(error);
 511}
 512
 513static uint32_t
 514xfs_stat_blksize(
 515	struct xfs_inode	*ip)
 516{
 517	struct xfs_mount	*mp = ip->i_mount;
 518
 519	/*
 520	 * If the file blocks are being allocated from a realtime volume, then
 521	 * always return the realtime extent size.
 522	 */
 523	if (XFS_IS_REALTIME_INODE(ip))
 524		return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip));
 525
 526	/*
 527	 * Allow large block sizes to be reported to userspace programs if the
 528	 * "largeio" mount option is used.
 529	 *
 530	 * If compatibility mode is specified, simply return the basic unit of
 531	 * caching so that we don't get inefficient read/modify/write I/O from
 532	 * user apps. Otherwise....
 533	 *
 534	 * If the underlying volume is a stripe, then return the stripe width in
 535	 * bytes as the recommended I/O size. It is not a stripe and we've set a
 536	 * default buffered I/O size, return that, otherwise return the compat
 537	 * default.
 538	 */
 539	if (xfs_has_large_iosize(mp)) {
 540		if (mp->m_swidth)
 541			return XFS_FSB_TO_B(mp, mp->m_swidth);
 542		if (xfs_has_allocsize(mp))
 543			return 1U << mp->m_allocsize_log;
 544	}
 545
 546	return PAGE_SIZE;
 547}
 548
 549STATIC int
 550xfs_vn_getattr(
 551	struct mnt_idmap	*idmap,
 552	const struct path	*path,
 553	struct kstat		*stat,
 554	u32			request_mask,
 555	unsigned int		query_flags)
 556{
 557	struct inode		*inode = d_inode(path->dentry);
 558	struct xfs_inode	*ip = XFS_I(inode);
 559	struct xfs_mount	*mp = ip->i_mount;
 560	vfsuid_t		vfsuid = i_uid_into_vfsuid(idmap, inode);
 561	vfsgid_t		vfsgid = i_gid_into_vfsgid(idmap, inode);
 562
 563	trace_xfs_getattr(ip);
 564
 565	if (xfs_is_shutdown(mp))
 566		return -EIO;
 567
 568	stat->size = XFS_ISIZE(ip);
 569	stat->dev = inode->i_sb->s_dev;
 570	stat->mode = inode->i_mode;
 571	stat->nlink = inode->i_nlink;
 572	stat->uid = vfsuid_into_kuid(vfsuid);
 573	stat->gid = vfsgid_into_kgid(vfsgid);
 574	stat->ino = ip->i_ino;
 575	stat->atime = inode_get_atime(inode);
 576	stat->mtime = inode_get_mtime(inode);
 577	stat->ctime = inode_get_ctime(inode);
 578	stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
 579
 580	if (xfs_has_v3inodes(mp)) {
 581		if (request_mask & STATX_BTIME) {
 582			stat->result_mask |= STATX_BTIME;
 583			stat->btime = ip->i_crtime;
 584		}
 585	}
 586
 587	if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
 588		stat->change_cookie = inode_query_iversion(inode);
 589		stat->result_mask |= STATX_CHANGE_COOKIE;
 590	}
 591
 592	/*
 593	 * Note: If you add another clause to set an attribute flag, please
 594	 * update attributes_mask below.
 595	 */
 596	if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE)
 597		stat->attributes |= STATX_ATTR_IMMUTABLE;
 598	if (ip->i_diflags & XFS_DIFLAG_APPEND)
 599		stat->attributes |= STATX_ATTR_APPEND;
 600	if (ip->i_diflags & XFS_DIFLAG_NODUMP)
 601		stat->attributes |= STATX_ATTR_NODUMP;
 602
 603	stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
 604				  STATX_ATTR_APPEND |
 605				  STATX_ATTR_NODUMP);
 606
 607	switch (inode->i_mode & S_IFMT) {
 608	case S_IFBLK:
 609	case S_IFCHR:
 610		stat->blksize = BLKDEV_IOSIZE;
 611		stat->rdev = inode->i_rdev;
 612		break;
 613	case S_IFREG:
 614		if (request_mask & STATX_DIOALIGN) {
 615			struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
 616			struct block_device	*bdev = target->bt_bdev;
 617
 618			stat->result_mask |= STATX_DIOALIGN;
 619			stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
 620			stat->dio_offset_align = bdev_logical_block_size(bdev);
 621		}
 622		fallthrough;
 623	default:
 624		stat->blksize = xfs_stat_blksize(ip);
 625		stat->rdev = 0;
 626		break;
 627	}
 628
 629	return 0;
 630}
 631
 632static int
 633xfs_vn_change_ok(
 634	struct mnt_idmap	*idmap,
 635	struct dentry		*dentry,
 636	struct iattr		*iattr)
 637{
 638	struct xfs_mount	*mp = XFS_I(d_inode(dentry))->i_mount;
 639
 640	if (xfs_is_readonly(mp))
 641		return -EROFS;
 642
 643	if (xfs_is_shutdown(mp))
 644		return -EIO;
 645
 646	return setattr_prepare(idmap, dentry, iattr);
 647}
 648
 649/*
 650 * Set non-size attributes of an inode.
 651 *
 652 * Caution: The caller of this function is responsible for calling
 653 * setattr_prepare() or otherwise verifying the change is fine.
 654 */
 655static int
 656xfs_setattr_nonsize(
 657	struct mnt_idmap	*idmap,
 658	struct dentry		*dentry,
 659	struct xfs_inode	*ip,
 660	struct iattr		*iattr)
 661{
 662	xfs_mount_t		*mp = ip->i_mount;
 663	struct inode		*inode = VFS_I(ip);
 664	int			mask = iattr->ia_valid;
 665	xfs_trans_t		*tp;
 666	int			error;
 667	kuid_t			uid = GLOBAL_ROOT_UID;
 668	kgid_t			gid = GLOBAL_ROOT_GID;
 669	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
 670	struct xfs_dquot	*old_udqp = NULL, *old_gdqp = NULL;
 671
 672	ASSERT((mask & ATTR_SIZE) == 0);
 673
 674	/*
 675	 * If disk quotas is on, we make sure that the dquots do exist on disk,
 676	 * before we start any other transactions. Trying to do this later
 677	 * is messy. We don't care to take a readlock to look at the ids
 678	 * in inode here, because we can't hold it across the trans_reserve.
 679	 * If the IDs do change before we take the ilock, we're covered
 680	 * because the i_*dquot fields will get updated anyway.
 681	 */
 682	if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
 683		uint	qflags = 0;
 684
 685		if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
 686			uid = from_vfsuid(idmap, i_user_ns(inode),
 687					  iattr->ia_vfsuid);
 688			qflags |= XFS_QMOPT_UQUOTA;
 689		} else {
 690			uid = inode->i_uid;
 691		}
 692		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
 693			gid = from_vfsgid(idmap, i_user_ns(inode),
 694					  iattr->ia_vfsgid);
 695			qflags |= XFS_QMOPT_GQUOTA;
 696		}  else {
 697			gid = inode->i_gid;
 698		}
 699
 700		/*
 701		 * We take a reference when we initialize udqp and gdqp,
 702		 * so it is important that we never blindly double trip on
 703		 * the same variable. See xfs_create() for an example.
 704		 */
 705		ASSERT(udqp == NULL);
 706		ASSERT(gdqp == NULL);
 707		error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid,
 708					   qflags, &udqp, &gdqp, NULL);
 709		if (error)
 710			return error;
 711	}
 712
 713	error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
 714			has_capability_noaudit(current, CAP_FOWNER), &tp);
 715	if (error)
 716		goto out_dqrele;
 717
 718	/*
 719	 * Register quota modifications in the transaction.  Must be the owner
 720	 * or privileged.  These IDs could have changed since we last looked at
 721	 * them.  But, we're assured that if the ownership did change while we
 722	 * didn't have the inode locked, inode's dquot(s) would have changed
 723	 * also.
 724	 */
 725	if (XFS_IS_UQUOTA_ON(mp) &&
 726	    i_uid_needs_update(idmap, iattr, inode)) {
 727		ASSERT(udqp);
 728		old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp);
 729	}
 730	if (XFS_IS_GQUOTA_ON(mp) &&
 731	    i_gid_needs_update(idmap, iattr, inode)) {
 732		ASSERT(xfs_has_pquotino(mp) || !XFS_IS_PQUOTA_ON(mp));
 733		ASSERT(gdqp);
 734		old_gdqp = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp);
 735	}
 736
 737	setattr_copy(idmap, inode, iattr);
 738	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 739
 740	XFS_STATS_INC(mp, xs_ig_attrchg);
 741
 742	if (xfs_has_wsync(mp))
 743		xfs_trans_set_sync(tp);
 744	error = xfs_trans_commit(tp);
 745
 746	/*
 747	 * Release any dquot(s) the inode had kept before chown.
 748	 */
 749	xfs_qm_dqrele(old_udqp);
 750	xfs_qm_dqrele(old_gdqp);
 751	xfs_qm_dqrele(udqp);
 752	xfs_qm_dqrele(gdqp);
 753
 754	if (error)
 755		return error;
 756
 757	/*
 758	 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
 759	 * 	     update.  We could avoid this with linked transactions
 760	 * 	     and passing down the transaction pointer all the way
 761	 *	     to attr_set.  No previous user of the generic
 762	 * 	     Posix ACL code seems to care about this issue either.
 763	 */
 764	if (mask & ATTR_MODE) {
 765		error = posix_acl_chmod(idmap, dentry, inode->i_mode);
 766		if (error)
 767			return error;
 768	}
 769
 770	return 0;
 771
 772out_dqrele:
 773	xfs_qm_dqrele(udqp);
 774	xfs_qm_dqrele(gdqp);
 775	return error;
 776}
 777
 778/*
 779 * Truncate file.  Must have write permission and not be a directory.
 780 *
 781 * Caution: The caller of this function is responsible for calling
 782 * setattr_prepare() or otherwise verifying the change is fine.
 783 */
 784STATIC int
 785xfs_setattr_size(
 786	struct mnt_idmap	*idmap,
 787	struct dentry		*dentry,
 788	struct xfs_inode	*ip,
 789	struct iattr		*iattr)
 790{
 791	struct xfs_mount	*mp = ip->i_mount;
 792	struct inode		*inode = VFS_I(ip);
 793	xfs_off_t		oldsize, newsize;
 794	struct xfs_trans	*tp;
 795	int			error;
 796	uint			lock_flags = 0;
 797	bool			did_zeroing = false;
 798
 799	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
 800	ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
 801	ASSERT(S_ISREG(inode->i_mode));
 802	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
 803		ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
 804
 805	oldsize = inode->i_size;
 806	newsize = iattr->ia_size;
 807
 808	/*
 809	 * Short circuit the truncate case for zero length files.
 810	 */
 811	if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
 812		if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
 813			return 0;
 814
 815		/*
 816		 * Use the regular setattr path to update the timestamps.
 817		 */
 818		iattr->ia_valid &= ~ATTR_SIZE;
 819		return xfs_setattr_nonsize(idmap, dentry, ip, iattr);
 820	}
 821
 822	/*
 823	 * Make sure that the dquots are attached to the inode.
 824	 */
 825	error = xfs_qm_dqattach(ip);
 826	if (error)
 827		return error;
 828
 829	/*
 830	 * Wait for all direct I/O to complete.
 831	 */
 832	inode_dio_wait(inode);
 833
 834	/*
 835	 * File data changes must be complete before we start the transaction to
 836	 * modify the inode.  This needs to be done before joining the inode to
 837	 * the transaction because the inode cannot be unlocked once it is a
 838	 * part of the transaction.
 839	 *
 840	 * Start with zeroing any data beyond EOF that we may expose on file
 841	 * extension, or zeroing out the rest of the block on a downward
 842	 * truncate.
 843	 */
 844	if (newsize > oldsize) {
 845		trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
 846		error = xfs_zero_range(ip, oldsize, newsize - oldsize,
 847				&did_zeroing);
 848	} else {
 849		/*
 850		 * iomap won't detect a dirty page over an unwritten block (or a
 851		 * cow block over a hole) and subsequently skips zeroing the
 852		 * newly post-EOF portion of the page. Flush the new EOF to
 853		 * convert the block before the pagecache truncate.
 854		 */
 855		error = filemap_write_and_wait_range(inode->i_mapping, newsize,
 856						     newsize);
 857		if (error)
 858			return error;
 859		error = xfs_truncate_page(ip, newsize, &did_zeroing);
 860	}
 861
 862	if (error)
 863		return error;
 864
 865	/*
 866	 * We've already locked out new page faults, so now we can safely remove
 867	 * pages from the page cache knowing they won't get refaulted until we
 868	 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
 869	 * complete. The truncate_setsize() call also cleans partial EOF page
 870	 * PTEs on extending truncates and hence ensures sub-page block size
 871	 * filesystems are correctly handled, too.
 872	 *
 873	 * We have to do all the page cache truncate work outside the
 874	 * transaction context as the "lock" order is page lock->log space
 875	 * reservation as defined by extent allocation in the writeback path.
 876	 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
 877	 * having already truncated the in-memory version of the file (i.e. made
 878	 * user visible changes). There's not much we can do about this, except
 879	 * to hope that the caller sees ENOMEM and retries the truncate
 880	 * operation.
 881	 *
 882	 * And we update in-core i_size and truncate page cache beyond newsize
 883	 * before writeback the [i_disk_size, newsize] range, so we're
 884	 * guaranteed not to write stale data past the new EOF on truncate down.
 885	 */
 886	truncate_setsize(inode, newsize);
 887
 888	/*
 889	 * We are going to log the inode size change in this transaction so
 890	 * any previous writes that are beyond the on disk EOF and the new
 891	 * EOF that have not been written out need to be written here.  If we
 892	 * do not write the data out, we expose ourselves to the null files
 893	 * problem. Note that this includes any block zeroing we did above;
 894	 * otherwise those blocks may not be zeroed after a crash.
 895	 */
 896	if (did_zeroing ||
 897	    (newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) {
 898		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
 899						ip->i_disk_size, newsize - 1);
 900		if (error)
 901			return error;
 902	}
 903
 904	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
 905	if (error)
 906		return error;
 907
 908	lock_flags |= XFS_ILOCK_EXCL;
 909	xfs_ilock(ip, XFS_ILOCK_EXCL);
 910	xfs_trans_ijoin(tp, ip, 0);
 911
 912	/*
 913	 * Only change the c/mtime if we are changing the size or we are
 914	 * explicitly asked to change it.  This handles the semantic difference
 915	 * between truncate() and ftruncate() as implemented in the VFS.
 916	 *
 917	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
 918	 * special case where we need to update the times despite not having
 919	 * these flags set.  For all other operations the VFS set these flags
 920	 * explicitly if it wants a timestamp update.
 921	 */
 922	if (newsize != oldsize &&
 923	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
 924		iattr->ia_ctime = iattr->ia_mtime =
 925			current_time(inode);
 926		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 927	}
 928
 929	/*
 930	 * The first thing we do is set the size to new_size permanently on
 931	 * disk.  This way we don't have to worry about anyone ever being able
 932	 * to look at the data being freed even in the face of a crash.
 933	 * What we're getting around here is the case where we free a block, it
 934	 * is allocated to another file, it is written to, and then we crash.
 935	 * If the new data gets written to the file but the log buffers
 936	 * containing the free and reallocation don't, then we'd end up with
 937	 * garbage in the blocks being freed.  As long as we make the new size
 938	 * permanent before actually freeing any blocks it doesn't matter if
 939	 * they get written to.
 940	 */
 941	ip->i_disk_size = newsize;
 942	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 943
 944	if (newsize <= oldsize) {
 945		error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
 946		if (error)
 947			goto out_trans_cancel;
 948
 949		/*
 950		 * Truncated "down", so we're removing references to old data
 951		 * here - if we delay flushing for a long time, we expose
 952		 * ourselves unduly to the notorious NULL files problem.  So,
 953		 * we mark this inode and flush it when the file is closed,
 954		 * and do not wait the usual (long) time for writeout.
 955		 */
 956		xfs_iflags_set(ip, XFS_ITRUNCATED);
 957
 958		/* A truncate down always removes post-EOF blocks. */
 959		xfs_inode_clear_eofblocks_tag(ip);
 960	}
 961
 962	ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
 963	setattr_copy(idmap, inode, iattr);
 964	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 965
 966	XFS_STATS_INC(mp, xs_ig_attrchg);
 967
 968	if (xfs_has_wsync(mp))
 969		xfs_trans_set_sync(tp);
 970
 971	error = xfs_trans_commit(tp);
 972out_unlock:
 973	if (lock_flags)
 974		xfs_iunlock(ip, lock_flags);
 975	return error;
 976
 977out_trans_cancel:
 978	xfs_trans_cancel(tp);
 979	goto out_unlock;
 980}
 981
 982int
 983xfs_vn_setattr_size(
 984	struct mnt_idmap	*idmap,
 985	struct dentry		*dentry,
 986	struct iattr		*iattr)
 987{
 988	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
 989	int error;
 990
 991	trace_xfs_setattr(ip);
 992
 993	error = xfs_vn_change_ok(idmap, dentry, iattr);
 994	if (error)
 995		return error;
 996	return xfs_setattr_size(idmap, dentry, ip, iattr);
 997}
 998
 999STATIC int
1000xfs_vn_setattr(
1001	struct mnt_idmap	*idmap,
1002	struct dentry		*dentry,
1003	struct iattr		*iattr)
1004{
1005	struct inode		*inode = d_inode(dentry);
1006	struct xfs_inode	*ip = XFS_I(inode);
1007	int			error;
1008
1009	if (iattr->ia_valid & ATTR_SIZE) {
1010		uint			iolock;
1011
1012		xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1013		iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1014
1015		error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1016		if (error) {
1017			xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1018			return error;
1019		}
1020
1021		error = xfs_vn_setattr_size(idmap, dentry, iattr);
1022		xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1023	} else {
1024		trace_xfs_setattr(ip);
1025
1026		error = xfs_vn_change_ok(idmap, dentry, iattr);
1027		if (!error)
1028			error = xfs_setattr_nonsize(idmap, dentry, ip, iattr);
1029	}
1030
1031	return error;
1032}
1033
1034STATIC int
1035xfs_vn_update_time(
1036	struct inode		*inode,
 
1037	int			flags)
1038{
1039	struct xfs_inode	*ip = XFS_I(inode);
1040	struct xfs_mount	*mp = ip->i_mount;
1041	int			log_flags = XFS_ILOG_TIMESTAMP;
1042	struct xfs_trans	*tp;
1043	int			error;
1044	struct timespec64	now;
1045
1046	trace_xfs_update_time(ip);
1047
1048	if (inode->i_sb->s_flags & SB_LAZYTIME) {
1049		if (!((flags & S_VERSION) &&
1050		      inode_maybe_inc_iversion(inode, false))) {
1051			generic_update_time(inode, flags);
1052			return 0;
1053		}
1054
1055		/* Capture the iversion update that just occurred */
1056		log_flags |= XFS_ILOG_CORE;
1057	}
1058
1059	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1060	if (error)
1061		return error;
1062
1063	xfs_ilock(ip, XFS_ILOCK_EXCL);
1064	if (flags & (S_CTIME|S_MTIME))
1065		now = inode_set_ctime_current(inode);
1066	else
1067		now = current_time(inode);
1068
1069	if (flags & S_MTIME)
1070		inode_set_mtime_to_ts(inode, now);
1071	if (flags & S_ATIME)
1072		inode_set_atime_to_ts(inode, now);
1073
1074	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1075	xfs_trans_log_inode(tp, ip, log_flags);
1076	return xfs_trans_commit(tp);
1077}
1078
1079STATIC int
1080xfs_vn_fiemap(
1081	struct inode		*inode,
1082	struct fiemap_extent_info *fieinfo,
1083	u64			start,
1084	u64			length)
1085{
1086	int			error;
1087
1088	xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1089	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1090		fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1091		error = iomap_fiemap(inode, fieinfo, start, length,
1092				&xfs_xattr_iomap_ops);
1093	} else {
1094		error = iomap_fiemap(inode, fieinfo, start, length,
1095				&xfs_read_iomap_ops);
1096	}
1097	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1098
1099	return error;
1100}
1101
1102STATIC int
1103xfs_vn_tmpfile(
1104	struct mnt_idmap	*idmap,
1105	struct inode		*dir,
1106	struct file		*file,
1107	umode_t			mode)
1108{
1109	int err = xfs_generic_create(idmap, dir, file->f_path.dentry, mode, 0, file);
1110
1111	return finish_open_simple(file, err);
1112}
1113
1114static const struct inode_operations xfs_inode_operations = {
1115	.get_inode_acl		= xfs_get_acl,
1116	.set_acl		= xfs_set_acl,
1117	.getattr		= xfs_vn_getattr,
1118	.setattr		= xfs_vn_setattr,
1119	.listxattr		= xfs_vn_listxattr,
1120	.fiemap			= xfs_vn_fiemap,
1121	.update_time		= xfs_vn_update_time,
1122	.fileattr_get		= xfs_fileattr_get,
1123	.fileattr_set		= xfs_fileattr_set,
1124};
1125
1126static const struct inode_operations xfs_dir_inode_operations = {
1127	.create			= xfs_vn_create,
1128	.lookup			= xfs_vn_lookup,
1129	.link			= xfs_vn_link,
1130	.unlink			= xfs_vn_unlink,
1131	.symlink		= xfs_vn_symlink,
1132	.mkdir			= xfs_vn_mkdir,
1133	/*
1134	 * Yes, XFS uses the same method for rmdir and unlink.
1135	 *
1136	 * There are some subtile differences deeper in the code,
1137	 * but we use S_ISDIR to check for those.
1138	 */
1139	.rmdir			= xfs_vn_unlink,
1140	.mknod			= xfs_vn_mknod,
1141	.rename			= xfs_vn_rename,
1142	.get_inode_acl		= xfs_get_acl,
1143	.set_acl		= xfs_set_acl,
1144	.getattr		= xfs_vn_getattr,
1145	.setattr		= xfs_vn_setattr,
1146	.listxattr		= xfs_vn_listxattr,
1147	.update_time		= xfs_vn_update_time,
1148	.tmpfile		= xfs_vn_tmpfile,
1149	.fileattr_get		= xfs_fileattr_get,
1150	.fileattr_set		= xfs_fileattr_set,
1151};
1152
1153static const struct inode_operations xfs_dir_ci_inode_operations = {
1154	.create			= xfs_vn_create,
1155	.lookup			= xfs_vn_ci_lookup,
1156	.link			= xfs_vn_link,
1157	.unlink			= xfs_vn_unlink,
1158	.symlink		= xfs_vn_symlink,
1159	.mkdir			= xfs_vn_mkdir,
1160	/*
1161	 * Yes, XFS uses the same method for rmdir and unlink.
1162	 *
1163	 * There are some subtile differences deeper in the code,
1164	 * but we use S_ISDIR to check for those.
1165	 */
1166	.rmdir			= xfs_vn_unlink,
1167	.mknod			= xfs_vn_mknod,
1168	.rename			= xfs_vn_rename,
1169	.get_inode_acl		= xfs_get_acl,
1170	.set_acl		= xfs_set_acl,
1171	.getattr		= xfs_vn_getattr,
1172	.setattr		= xfs_vn_setattr,
1173	.listxattr		= xfs_vn_listxattr,
1174	.update_time		= xfs_vn_update_time,
1175	.tmpfile		= xfs_vn_tmpfile,
1176	.fileattr_get		= xfs_fileattr_get,
1177	.fileattr_set		= xfs_fileattr_set,
1178};
1179
1180static const struct inode_operations xfs_symlink_inode_operations = {
1181	.get_link		= xfs_vn_get_link,
1182	.getattr		= xfs_vn_getattr,
1183	.setattr		= xfs_vn_setattr,
1184	.listxattr		= xfs_vn_listxattr,
1185	.update_time		= xfs_vn_update_time,
1186};
1187
1188/* Figure out if this file actually supports DAX. */
1189static bool
1190xfs_inode_supports_dax(
1191	struct xfs_inode	*ip)
1192{
1193	struct xfs_mount	*mp = ip->i_mount;
1194
1195	/* Only supported on regular files. */
1196	if (!S_ISREG(VFS_I(ip)->i_mode))
1197		return false;
1198
1199	/* Block size must match page size */
1200	if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1201		return false;
1202
1203	/* Device has to support DAX too. */
1204	return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1205}
1206
1207static bool
1208xfs_inode_should_enable_dax(
1209	struct xfs_inode *ip)
1210{
1211	if (!IS_ENABLED(CONFIG_FS_DAX))
1212		return false;
1213	if (xfs_has_dax_never(ip->i_mount))
1214		return false;
1215	if (!xfs_inode_supports_dax(ip))
1216		return false;
1217	if (xfs_has_dax_always(ip->i_mount))
1218		return true;
1219	if (ip->i_diflags2 & XFS_DIFLAG2_DAX)
1220		return true;
1221	return false;
1222}
1223
1224void
1225xfs_diflags_to_iflags(
1226	struct xfs_inode	*ip,
1227	bool init)
1228{
1229	struct inode            *inode = VFS_I(ip);
1230	unsigned int            xflags = xfs_ip2xflags(ip);
1231	unsigned int            flags = 0;
1232
1233	ASSERT(!(IS_DAX(inode) && init));
1234
1235	if (xflags & FS_XFLAG_IMMUTABLE)
1236		flags |= S_IMMUTABLE;
1237	if (xflags & FS_XFLAG_APPEND)
1238		flags |= S_APPEND;
1239	if (xflags & FS_XFLAG_SYNC)
1240		flags |= S_SYNC;
1241	if (xflags & FS_XFLAG_NOATIME)
1242		flags |= S_NOATIME;
1243	if (init && xfs_inode_should_enable_dax(ip))
1244		flags |= S_DAX;
1245
1246	/*
1247	 * S_DAX can only be set during inode initialization and is never set by
1248	 * the VFS, so we cannot mask off S_DAX in i_flags.
1249	 */
1250	inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1251	inode->i_flags |= flags;
1252}
1253
1254/*
1255 * Initialize the Linux inode.
1256 *
1257 * When reading existing inodes from disk this is called directly from xfs_iget,
1258 * when creating a new inode it is called from xfs_init_new_inode after setting
1259 * up the inode. These callers have different criteria for clearing XFS_INEW, so
1260 * leave it up to the caller to deal with unlocking the inode appropriately.
1261 */
1262void
1263xfs_setup_inode(
1264	struct xfs_inode	*ip)
1265{
1266	struct inode		*inode = &ip->i_vnode;
1267	gfp_t			gfp_mask;
1268
1269	inode->i_ino = ip->i_ino;
1270	inode->i_state |= I_NEW;
1271
1272	inode_sb_list_add(inode);
1273	/* make the inode look hashed for the writeback code */
1274	inode_fake_hash(inode);
1275
1276	i_size_write(inode, ip->i_disk_size);
1277	xfs_diflags_to_iflags(ip, true);
1278
1279	if (S_ISDIR(inode->i_mode)) {
1280		/*
1281		 * We set the i_rwsem class here to avoid potential races with
1282		 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1283		 * after a filehandle lookup has already found the inode in
1284		 * cache before it has been unlocked via unlock_new_inode().
1285		 */
1286		lockdep_set_class(&inode->i_rwsem,
1287				  &inode->i_sb->s_type->i_mutex_dir_key);
1288		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1289	} else {
1290		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1291	}
1292
1293	/*
1294	 * Ensure all page cache allocations are done from GFP_NOFS context to
1295	 * prevent direct reclaim recursion back into the filesystem and blowing
1296	 * stacks or deadlocking.
1297	 */
1298	gfp_mask = mapping_gfp_mask(inode->i_mapping);
1299	mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1300
1301	/*
1302	 * For real-time inodes update the stable write flags to that of the RT
1303	 * device instead of the data device.
1304	 */
1305	if (S_ISREG(inode->i_mode) && XFS_IS_REALTIME_INODE(ip))
1306		xfs_update_stable_writes(ip);
1307
1308	/*
1309	 * If there is no attribute fork no ACL can exist on this inode,
1310	 * and it can't have any file capabilities attached to it either.
1311	 */
1312	if (!xfs_inode_has_attr_fork(ip)) {
1313		inode_has_no_xattr(inode);
1314		cache_no_acl(inode);
1315	}
1316}
1317
1318void
1319xfs_setup_iops(
1320	struct xfs_inode	*ip)
1321{
1322	struct inode		*inode = &ip->i_vnode;
1323
1324	switch (inode->i_mode & S_IFMT) {
1325	case S_IFREG:
1326		inode->i_op = &xfs_inode_operations;
1327		inode->i_fop = &xfs_file_operations;
1328		if (IS_DAX(inode))
1329			inode->i_mapping->a_ops = &xfs_dax_aops;
1330		else
1331			inode->i_mapping->a_ops = &xfs_address_space_operations;
1332		break;
1333	case S_IFDIR:
1334		if (xfs_has_asciici(XFS_M(inode->i_sb)))
1335			inode->i_op = &xfs_dir_ci_inode_operations;
1336		else
1337			inode->i_op = &xfs_dir_inode_operations;
1338		inode->i_fop = &xfs_dir_file_operations;
1339		break;
1340	case S_IFLNK:
1341		inode->i_op = &xfs_symlink_inode_operations;
1342		break;
1343	default:
1344		inode->i_op = &xfs_inode_operations;
1345		init_special_inode(inode, inode->i_mode, inode->i_rdev);
1346		break;
1347	}
1348}