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_attr.h"
  17#include "xfs_trans.h"
  18#include "xfs_trace.h"
  19#include "xfs_icache.h"
  20#include "xfs_symlink.h"
  21#include "xfs_dir2.h"
  22#include "xfs_iomap.h"
  23#include "xfs_error.h"
  24#include "xfs_ioctl.h"
  25
  26#include <linux/posix_acl.h>
  27#include <linux/security.h>
  28#include <linux/iversion.h>
  29#include <linux/fiemap.h>
  30
  31/*
  32 * Directories have different lock order w.r.t. mmap_lock compared to regular
  33 * files. This is due to readdir potentially triggering page faults on a user
  34 * buffer inside filldir(), and this happens with the ilock on the directory
  35 * held. For regular files, the lock order is the other way around - the
  36 * mmap_lock is taken during the page fault, and then we lock the ilock to do
  37 * block mapping. Hence we need a different class for the directory ilock so
  38 * that lockdep can tell them apart.
  39 */
  40static struct lock_class_key xfs_nondir_ilock_class;
  41static struct lock_class_key xfs_dir_ilock_class;
  42
  43static int
  44xfs_initxattrs(
  45	struct inode		*inode,
  46	const struct xattr	*xattr_array,
  47	void			*fs_info)
  48{
  49	const struct xattr	*xattr;
  50	struct xfs_inode	*ip = XFS_I(inode);
  51	int			error = 0;
  52
  53	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  54		struct xfs_da_args	args = {
  55			.dp		= ip,
  56			.attr_filter	= XFS_ATTR_SECURE,
  57			.name		= xattr->name,
  58			.namelen	= strlen(xattr->name),
  59			.value		= xattr->value,
  60			.valuelen	= xattr->value_len,
  61		};
  62		error = xfs_attr_set(&args);
  63		if (error < 0)
  64			break;
  65	}
  66	return error;
  67}
  68
  69/*
  70 * Hook in SELinux.  This is not quite correct yet, what we really need
  71 * here (as we do for default ACLs) is a mechanism by which creation of
  72 * these attrs can be journalled at inode creation time (along with the
  73 * inode, of course, such that log replay can't cause these to be lost).
  74 */
  75
  76STATIC int
  77xfs_init_security(
  78	struct inode	*inode,
  79	struct inode	*dir,
  80	const struct qstr *qstr)
  81{
  82	return security_inode_init_security(inode, dir, qstr,
  83					     &xfs_initxattrs, NULL);
  84}
  85
  86static void
  87xfs_dentry_to_name(
  88	struct xfs_name	*namep,
  89	struct dentry	*dentry)
  90{
  91	namep->name = dentry->d_name.name;
  92	namep->len = dentry->d_name.len;
  93	namep->type = XFS_DIR3_FT_UNKNOWN;
  94}
  95
  96static int
  97xfs_dentry_mode_to_name(
  98	struct xfs_name	*namep,
  99	struct dentry	*dentry,
 100	int		mode)
 101{
 102	namep->name = dentry->d_name.name;
 103	namep->len = dentry->d_name.len;
 104	namep->type = xfs_mode_to_ftype(mode);
 105
 106	if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
 107		return -EFSCORRUPTED;
 108
 109	return 0;
 110}
 111
 112STATIC void
 113xfs_cleanup_inode(
 114	struct inode	*dir,
 115	struct inode	*inode,
 116	struct dentry	*dentry)
 117{
 118	struct xfs_name	teardown;
 119
 120	/* Oh, the horror.
 121	 * If we can't add the ACL or we fail in
 122	 * xfs_init_security we must back out.
 123	 * ENOSPC can hit here, among other things.
 124	 */
 125	xfs_dentry_to_name(&teardown, dentry);
 126
 127	xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
 128}
 129
 130/*
 131 * Check to see if we are likely to need an extended attribute to be added to
 132 * the inode we are about to allocate. This allows the attribute fork to be
 133 * created during the inode allocation, reducing the number of transactions we
 134 * need to do in this fast path.
 135 *
 136 * The security checks are optimistic, but not guaranteed. The two LSMs that
 137 * require xattrs to be added here (selinux and smack) are also the only two
 138 * LSMs that add a sb->s_security structure to the superblock. Hence if security
 139 * is enabled and sb->s_security is set, we have a pretty good idea that we are
 140 * going to be asked to add a security xattr immediately after allocating the
 141 * xfs inode and instantiating the VFS inode.
 142 */
 143static inline bool
 144xfs_create_need_xattr(
 145	struct inode	*dir,
 146	struct posix_acl *default_acl,
 147	struct posix_acl *acl)
 148{
 149	if (acl)
 150		return true;
 151	if (default_acl)
 152		return true;
 153#if IS_ENABLED(CONFIG_SECURITY)
 154	if (dir->i_sb->s_security)
 155		return true;
 156#endif
 157	return false;
 158}
 159
 160
 161STATIC int
 162xfs_generic_create(
 163	struct user_namespace	*mnt_userns,
 164	struct inode	*dir,
 165	struct dentry	*dentry,
 166	umode_t		mode,
 167	dev_t		rdev,
 168	bool		tmpfile)	/* unnamed file */
 169{
 170	struct inode	*inode;
 171	struct xfs_inode *ip = NULL;
 172	struct posix_acl *default_acl, *acl;
 173	struct xfs_name	name;
 174	int		error;
 175
 176	/*
 177	 * Irix uses Missed'em'V split, but doesn't want to see
 178	 * the upper 5 bits of (14bit) major.
 179	 */
 180	if (S_ISCHR(mode) || S_ISBLK(mode)) {
 181		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
 182			return -EINVAL;
 183	} else {
 184		rdev = 0;
 185	}
 186
 187	error = posix_acl_create(dir, &mode, &default_acl, &acl);
 188	if (error)
 189		return error;
 190
 191	/* Verify mode is valid also for tmpfile case */
 192	error = xfs_dentry_mode_to_name(&name, dentry, mode);
 193	if (unlikely(error))
 194		goto out_free_acl;
 195
 196	if (!tmpfile) {
 197		error = xfs_create(mnt_userns, XFS_I(dir), &name, mode, rdev,
 198				xfs_create_need_xattr(dir, default_acl, acl),
 199				&ip);
 200	} else {
 201		error = xfs_create_tmpfile(mnt_userns, XFS_I(dir), mode, &ip);
 202	}
 203	if (unlikely(error))
 204		goto out_free_acl;
 205
 206	inode = VFS_I(ip);
 207
 208	error = xfs_init_security(inode, dir, &dentry->d_name);
 209	if (unlikely(error))
 210		goto out_cleanup_inode;
 211
 212#ifdef CONFIG_XFS_POSIX_ACL
 213	if (default_acl) {
 214		error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 215		if (error)
 216			goto out_cleanup_inode;
 217	}
 218	if (acl) {
 219		error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
 220		if (error)
 221			goto out_cleanup_inode;
 222	}
 223#endif
 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(dentry, 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 user_namespace	*mnt_userns,
 259	struct inode		*dir,
 260	struct dentry		*dentry,
 261	umode_t			mode,
 262	dev_t			rdev)
 263{
 264	return xfs_generic_create(mnt_userns, dir, dentry, mode, rdev, false);
 265}
 266
 267STATIC int
 268xfs_vn_create(
 269	struct user_namespace	*mnt_userns,
 270	struct inode		*dir,
 271	struct dentry		*dentry,
 272	umode_t			mode,
 273	bool			flags)
 274{
 275	return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, false);
 276}
 277
 278STATIC int
 279xfs_vn_mkdir(
 280	struct user_namespace	*mnt_userns,
 281	struct inode		*dir,
 282	struct dentry		*dentry,
 283	umode_t			mode)
 284{
 285	return xfs_generic_create(mnt_userns, dir, dentry, mode | S_IFDIR, 0,
 286				  false);
 287}
 288
 289STATIC struct dentry *
 290xfs_vn_lookup(
 291	struct inode	*dir,
 292	struct dentry	*dentry,
 293	unsigned int flags)
 294{
 295	struct inode *inode;
 296	struct xfs_inode *cip;
 297	struct xfs_name	name;
 298	int		error;
 299
 300	if (dentry->d_name.len >= MAXNAMELEN)
 301		return ERR_PTR(-ENAMETOOLONG);
 302
 303	xfs_dentry_to_name(&name, dentry);
 304	error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
 305	if (likely(!error))
 306		inode = VFS_I(cip);
 307	else if (likely(error == -ENOENT))
 308		inode = NULL;
 309	else
 310		inode = ERR_PTR(error);
 311	return d_splice_alias(inode, dentry);
 312}
 313
 314STATIC struct dentry *
 315xfs_vn_ci_lookup(
 316	struct inode	*dir,
 317	struct dentry	*dentry,
 318	unsigned int flags)
 319{
 320	struct xfs_inode *ip;
 321	struct xfs_name	xname;
 322	struct xfs_name ci_name;
 323	struct qstr	dname;
 324	int		error;
 325
 326	if (dentry->d_name.len >= MAXNAMELEN)
 327		return ERR_PTR(-ENAMETOOLONG);
 328
 329	xfs_dentry_to_name(&xname, dentry);
 330	error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
 331	if (unlikely(error)) {
 332		if (unlikely(error != -ENOENT))
 333			return ERR_PTR(error);
 334		/*
 335		 * call d_add(dentry, NULL) here when d_drop_negative_children
 336		 * is called in xfs_vn_mknod (ie. allow negative dentries
 337		 * with CI filesystems).
 338		 */
 339		return NULL;
 340	}
 341
 342	/* if exact match, just splice and exit */
 343	if (!ci_name.name)
 344		return d_splice_alias(VFS_I(ip), dentry);
 345
 346	/* else case-insensitive match... */
 347	dname.name = ci_name.name;
 348	dname.len = ci_name.len;
 349	dentry = d_add_ci(dentry, VFS_I(ip), &dname);
 350	kmem_free(ci_name.name);
 351	return dentry;
 352}
 353
 354STATIC int
 355xfs_vn_link(
 356	struct dentry	*old_dentry,
 357	struct inode	*dir,
 358	struct dentry	*dentry)
 359{
 360	struct inode	*inode = d_inode(old_dentry);
 361	struct xfs_name	name;
 362	int		error;
 363
 364	error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
 365	if (unlikely(error))
 366		return error;
 367
 368	error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
 369	if (unlikely(error))
 370		return error;
 371
 372	ihold(inode);
 373	d_instantiate(dentry, inode);
 374	return 0;
 375}
 376
 377STATIC int
 378xfs_vn_unlink(
 379	struct inode	*dir,
 380	struct dentry	*dentry)
 381{
 382	struct xfs_name	name;
 383	int		error;
 384
 385	xfs_dentry_to_name(&name, dentry);
 386
 387	error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
 388	if (error)
 389		return error;
 390
 391	/*
 392	 * With unlink, the VFS makes the dentry "negative": no inode,
 393	 * but still hashed. This is incompatible with case-insensitive
 394	 * mode, so invalidate (unhash) the dentry in CI-mode.
 395	 */
 396	if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
 397		d_invalidate(dentry);
 398	return 0;
 399}
 400
 401STATIC int
 402xfs_vn_symlink(
 403	struct user_namespace	*mnt_userns,
 404	struct inode		*dir,
 405	struct dentry		*dentry,
 406	const char		*symname)
 407{
 408	struct inode	*inode;
 409	struct xfs_inode *cip = NULL;
 410	struct xfs_name	name;
 411	int		error;
 412	umode_t		mode;
 413
 414	mode = S_IFLNK |
 415		(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
 416	error = xfs_dentry_mode_to_name(&name, dentry, mode);
 417	if (unlikely(error))
 418		goto out;
 419
 420	error = xfs_symlink(mnt_userns, XFS_I(dir), &name, symname, mode, &cip);
 421	if (unlikely(error))
 422		goto out;
 423
 424	inode = VFS_I(cip);
 425
 426	error = xfs_init_security(inode, dir, &dentry->d_name);
 427	if (unlikely(error))
 428		goto out_cleanup_inode;
 429
 430	xfs_setup_iops(cip);
 431
 432	d_instantiate(dentry, inode);
 433	xfs_finish_inode_setup(cip);
 434	return 0;
 435
 436 out_cleanup_inode:
 437	xfs_finish_inode_setup(cip);
 438	xfs_cleanup_inode(dir, inode, dentry);
 439	xfs_irele(cip);
 440 out:
 441	return error;
 442}
 443
 444STATIC int
 445xfs_vn_rename(
 446	struct user_namespace	*mnt_userns,
 447	struct inode		*odir,
 448	struct dentry		*odentry,
 449	struct inode		*ndir,
 450	struct dentry		*ndentry,
 451	unsigned int		flags)
 452{
 453	struct inode	*new_inode = d_inode(ndentry);
 454	int		omode = 0;
 455	int		error;
 456	struct xfs_name	oname;
 457	struct xfs_name	nname;
 458
 459	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 460		return -EINVAL;
 461
 462	/* if we are exchanging files, we need to set i_mode of both files */
 463	if (flags & RENAME_EXCHANGE)
 464		omode = d_inode(ndentry)->i_mode;
 465
 466	error = xfs_dentry_mode_to_name(&oname, odentry, omode);
 467	if (omode && unlikely(error))
 468		return error;
 469
 470	error = xfs_dentry_mode_to_name(&nname, ndentry,
 471					d_inode(odentry)->i_mode);
 472	if (unlikely(error))
 473		return error;
 474
 475	return xfs_rename(mnt_userns, XFS_I(odir), &oname,
 476			  XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
 477			  new_inode ? XFS_I(new_inode) : NULL, flags);
 478}
 479
 480/*
 481 * careful here - this function can get called recursively, so
 482 * we need to be very careful about how much stack we use.
 483 * uio is kmalloced for this reason...
 484 */
 485STATIC const char *
 486xfs_vn_get_link(
 487	struct dentry		*dentry,
 488	struct inode		*inode,
 489	struct delayed_call	*done)
 490{
 491	char			*link;
 492	int			error = -ENOMEM;
 493
 494	if (!dentry)
 495		return ERR_PTR(-ECHILD);
 496
 497	link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
 498	if (!link)
 499		goto out_err;
 500
 501	error = xfs_readlink(XFS_I(d_inode(dentry)), link);
 502	if (unlikely(error))
 503		goto out_kfree;
 504
 505	set_delayed_call(done, kfree_link, link);
 506	return link;
 507
 508 out_kfree:
 509	kfree(link);
 510 out_err:
 511	return ERR_PTR(error);
 512}
 513
 514STATIC const char *
 515xfs_vn_get_link_inline(
 516	struct dentry		*dentry,
 517	struct inode		*inode,
 518	struct delayed_call	*done)
 519{
 520	struct xfs_inode	*ip = XFS_I(inode);
 521	char			*link;
 522
 523	ASSERT(ip->i_df.if_format == XFS_DINODE_FMT_LOCAL);
 524
 525	/*
 526	 * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
 527	 * if_data is junk.
 528	 */
 529	link = ip->i_df.if_u1.if_data;
 530	if (XFS_IS_CORRUPT(ip->i_mount, !link))
 531		return ERR_PTR(-EFSCORRUPTED);
 532	return link;
 533}
 534
 535static uint32_t
 536xfs_stat_blksize(
 537	struct xfs_inode	*ip)
 538{
 539	struct xfs_mount	*mp = ip->i_mount;
 540
 541	/*
 542	 * If the file blocks are being allocated from a realtime volume, then
 543	 * always return the realtime extent size.
 544	 */
 545	if (XFS_IS_REALTIME_INODE(ip))
 546		return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip));
 547
 548	/*
 549	 * Allow large block sizes to be reported to userspace programs if the
 550	 * "largeio" mount option is used.
 551	 *
 552	 * If compatibility mode is specified, simply return the basic unit of
 553	 * caching so that we don't get inefficient read/modify/write I/O from
 554	 * user apps. Otherwise....
 555	 *
 556	 * If the underlying volume is a stripe, then return the stripe width in
 557	 * bytes as the recommended I/O size. It is not a stripe and we've set a
 558	 * default buffered I/O size, return that, otherwise return the compat
 559	 * default.
 560	 */
 561	if (mp->m_flags & XFS_MOUNT_LARGEIO) {
 562		if (mp->m_swidth)
 563			return XFS_FSB_TO_B(mp, mp->m_swidth);
 564		if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
 565			return 1U << mp->m_allocsize_log;
 566	}
 567
 568	return PAGE_SIZE;
 569}
 570
 571STATIC int
 572xfs_vn_getattr(
 573	struct user_namespace	*mnt_userns,
 574	const struct path	*path,
 575	struct kstat		*stat,
 576	u32			request_mask,
 577	unsigned int		query_flags)
 578{
 579	struct inode		*inode = d_inode(path->dentry);
 580	struct xfs_inode	*ip = XFS_I(inode);
 581	struct xfs_mount	*mp = ip->i_mount;
 582
 583	trace_xfs_getattr(ip);
 584
 585	if (XFS_FORCED_SHUTDOWN(mp))
 586		return -EIO;
 587
 588	stat->size = XFS_ISIZE(ip);
 589	stat->dev = inode->i_sb->s_dev;
 590	stat->mode = inode->i_mode;
 591	stat->nlink = inode->i_nlink;
 592	stat->uid = i_uid_into_mnt(mnt_userns, inode);
 593	stat->gid = i_gid_into_mnt(mnt_userns, inode);
 594	stat->ino = ip->i_ino;
 595	stat->atime = inode->i_atime;
 596	stat->mtime = inode->i_mtime;
 597	stat->ctime = inode->i_ctime;
 598	stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
 
 599
 600	if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
 601		if (request_mask & STATX_BTIME) {
 602			stat->result_mask |= STATX_BTIME;
 603			stat->btime = ip->i_crtime;
 604		}
 605	}
 606
 607	/*
 608	 * Note: If you add another clause to set an attribute flag, please
 609	 * update attributes_mask below.
 610	 */
 611	if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE)
 612		stat->attributes |= STATX_ATTR_IMMUTABLE;
 613	if (ip->i_diflags & XFS_DIFLAG_APPEND)
 614		stat->attributes |= STATX_ATTR_APPEND;
 615	if (ip->i_diflags & XFS_DIFLAG_NODUMP)
 616		stat->attributes |= STATX_ATTR_NODUMP;
 617
 618	stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
 619				  STATX_ATTR_APPEND |
 620				  STATX_ATTR_NODUMP);
 621
 622	switch (inode->i_mode & S_IFMT) {
 623	case S_IFBLK:
 624	case S_IFCHR:
 625		stat->blksize = BLKDEV_IOSIZE;
 626		stat->rdev = inode->i_rdev;
 627		break;
 628	default:
 629		stat->blksize = xfs_stat_blksize(ip);
 630		stat->rdev = 0;
 631		break;
 632	}
 633
 634	return 0;
 635}
 636
 637static void
 638xfs_setattr_mode(
 639	struct xfs_inode	*ip,
 640	struct iattr		*iattr)
 641{
 642	struct inode		*inode = VFS_I(ip);
 643	umode_t			mode = iattr->ia_mode;
 644
 645	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 646
 647	inode->i_mode &= S_IFMT;
 648	inode->i_mode |= mode & ~S_IFMT;
 649}
 650
 651void
 652xfs_setattr_time(
 653	struct xfs_inode	*ip,
 654	struct iattr		*iattr)
 655{
 656	struct inode		*inode = VFS_I(ip);
 657
 658	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 659
 660	if (iattr->ia_valid & ATTR_ATIME)
 661		inode->i_atime = iattr->ia_atime;
 662	if (iattr->ia_valid & ATTR_CTIME)
 663		inode->i_ctime = iattr->ia_ctime;
 664	if (iattr->ia_valid & ATTR_MTIME)
 665		inode->i_mtime = iattr->ia_mtime;
 666}
 667
 668static int
 669xfs_vn_change_ok(
 670	struct user_namespace	*mnt_userns,
 671	struct dentry		*dentry,
 672	struct iattr		*iattr)
 673{
 674	struct xfs_mount	*mp = XFS_I(d_inode(dentry))->i_mount;
 675
 676	if (mp->m_flags & XFS_MOUNT_RDONLY)
 677		return -EROFS;
 678
 679	if (XFS_FORCED_SHUTDOWN(mp))
 680		return -EIO;
 681
 682	return setattr_prepare(mnt_userns, dentry, iattr);
 683}
 684
 685/*
 686 * Set non-size attributes of an inode.
 687 *
 688 * Caution: The caller of this function is responsible for calling
 689 * setattr_prepare() or otherwise verifying the change is fine.
 690 */
 691static int
 692xfs_setattr_nonsize(
 693	struct user_namespace	*mnt_userns,
 694	struct xfs_inode	*ip,
 695	struct iattr		*iattr)
 
 696{
 697	xfs_mount_t		*mp = ip->i_mount;
 698	struct inode		*inode = VFS_I(ip);
 699	int			mask = iattr->ia_valid;
 700	xfs_trans_t		*tp;
 701	int			error;
 702	kuid_t			uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
 703	kgid_t			gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
 704	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
 705	struct xfs_dquot	*olddquot1 = NULL, *olddquot2 = NULL;
 706
 707	ASSERT((mask & ATTR_SIZE) == 0);
 708
 709	/*
 710	 * If disk quotas is on, we make sure that the dquots do exist on disk,
 711	 * before we start any other transactions. Trying to do this later
 712	 * is messy. We don't care to take a readlock to look at the ids
 713	 * in inode here, because we can't hold it across the trans_reserve.
 714	 * If the IDs do change before we take the ilock, we're covered
 715	 * because the i_*dquot fields will get updated anyway.
 716	 */
 717	if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
 718		uint	qflags = 0;
 719
 720		if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
 721			uid = iattr->ia_uid;
 722			qflags |= XFS_QMOPT_UQUOTA;
 723		} else {
 724			uid = inode->i_uid;
 725		}
 726		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
 727			gid = iattr->ia_gid;
 728			qflags |= XFS_QMOPT_GQUOTA;
 729		}  else {
 730			gid = inode->i_gid;
 731		}
 732
 733		/*
 734		 * We take a reference when we initialize udqp and gdqp,
 735		 * so it is important that we never blindly double trip on
 736		 * the same variable. See xfs_create() for an example.
 737		 */
 738		ASSERT(udqp == NULL);
 739		ASSERT(gdqp == NULL);
 740		error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid,
 741					   qflags, &udqp, &gdqp, NULL);
 742		if (error)
 743			return error;
 744	}
 745
 746	error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
 747			capable(CAP_FOWNER), &tp);
 748	if (error)
 749		goto out_dqrele;
 750
 
 
 
 751	/*
 752	 * Change file ownership.  Must be the owner or privileged.
 753	 */
 754	if (mask & (ATTR_UID|ATTR_GID)) {
 755		/*
 756		 * These IDs could have changed since we last looked at them.
 757		 * But, we're assured that if the ownership did change
 758		 * while we didn't have the inode locked, inode's dquot(s)
 759		 * would have changed also.
 760		 */
 761		iuid = inode->i_uid;
 762		igid = inode->i_gid;
 763		gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
 764		uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
 765
 766		/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 767		 * CAP_FSETID overrides the following restrictions:
 768		 *
 769		 * The set-user-ID and set-group-ID bits of a file will be
 770		 * cleared upon successful return from chown()
 771		 */
 772		if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
 773		    !capable(CAP_FSETID))
 774			inode->i_mode &= ~(S_ISUID|S_ISGID);
 775
 776		/*
 777		 * Change the ownerships and register quota modifications
 778		 * in the transaction.
 779		 */
 780		if (!uid_eq(iuid, uid)) {
 781			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
 782				ASSERT(mask & ATTR_UID);
 783				ASSERT(udqp);
 784				olddquot1 = xfs_qm_vop_chown(tp, ip,
 785							&ip->i_udquot, udqp);
 786			}
 787			inode->i_uid = uid;
 788		}
 789		if (!gid_eq(igid, gid)) {
 790			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
 791				ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
 792				       !XFS_IS_PQUOTA_ON(mp));
 793				ASSERT(mask & ATTR_GID);
 794				ASSERT(gdqp);
 795				olddquot2 = xfs_qm_vop_chown(tp, ip,
 796							&ip->i_gdquot, gdqp);
 797			}
 798			inode->i_gid = gid;
 799		}
 800	}
 801
 802	if (mask & ATTR_MODE)
 803		xfs_setattr_mode(ip, iattr);
 804	if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
 805		xfs_setattr_time(ip, iattr);
 806
 807	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 808
 809	XFS_STATS_INC(mp, xs_ig_attrchg);
 810
 811	if (mp->m_flags & XFS_MOUNT_WSYNC)
 812		xfs_trans_set_sync(tp);
 813	error = xfs_trans_commit(tp);
 814
 
 
 815	/*
 816	 * Release any dquot(s) the inode had kept before chown.
 817	 */
 818	xfs_qm_dqrele(olddquot1);
 819	xfs_qm_dqrele(olddquot2);
 820	xfs_qm_dqrele(udqp);
 821	xfs_qm_dqrele(gdqp);
 822
 823	if (error)
 824		return error;
 825
 826	/*
 827	 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
 828	 * 	     update.  We could avoid this with linked transactions
 829	 * 	     and passing down the transaction pointer all the way
 830	 *	     to attr_set.  No previous user of the generic
 831	 * 	     Posix ACL code seems to care about this issue either.
 832	 */
 833	if (mask & ATTR_MODE) {
 834		error = posix_acl_chmod(mnt_userns, inode, inode->i_mode);
 835		if (error)
 836			return error;
 837	}
 838
 839	return 0;
 840
 
 
 
 841out_dqrele:
 842	xfs_qm_dqrele(udqp);
 843	xfs_qm_dqrele(gdqp);
 844	return error;
 845}
 846
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 847/*
 848 * Truncate file.  Must have write permission and not be a directory.
 849 *
 850 * Caution: The caller of this function is responsible for calling
 851 * setattr_prepare() or otherwise verifying the change is fine.
 852 */
 853STATIC int
 854xfs_setattr_size(
 855	struct user_namespace	*mnt_userns,
 856	struct xfs_inode	*ip,
 857	struct iattr		*iattr)
 858{
 859	struct xfs_mount	*mp = ip->i_mount;
 860	struct inode		*inode = VFS_I(ip);
 861	xfs_off_t		oldsize, newsize;
 862	struct xfs_trans	*tp;
 863	int			error;
 864	uint			lock_flags = 0;
 865	bool			did_zeroing = false;
 866
 867	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
 868	ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
 869	ASSERT(S_ISREG(inode->i_mode));
 870	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
 871		ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
 872
 873	oldsize = inode->i_size;
 874	newsize = iattr->ia_size;
 875
 876	/*
 877	 * Short circuit the truncate case for zero length files.
 878	 */
 879	if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
 880		if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
 881			return 0;
 882
 883		/*
 884		 * Use the regular setattr path to update the timestamps.
 885		 */
 886		iattr->ia_valid &= ~ATTR_SIZE;
 887		return xfs_setattr_nonsize(mnt_userns, ip, iattr);
 888	}
 889
 890	/*
 891	 * Make sure that the dquots are attached to the inode.
 892	 */
 893	error = xfs_qm_dqattach(ip);
 894	if (error)
 895		return error;
 896
 897	/*
 898	 * Wait for all direct I/O to complete.
 899	 */
 900	inode_dio_wait(inode);
 901
 902	/*
 903	 * File data changes must be complete before we start the transaction to
 904	 * modify the inode.  This needs to be done before joining the inode to
 905	 * the transaction because the inode cannot be unlocked once it is a
 906	 * part of the transaction.
 907	 *
 908	 * Start with zeroing any data beyond EOF that we may expose on file
 909	 * extension, or zeroing out the rest of the block on a downward
 910	 * truncate.
 911	 */
 912	if (newsize > oldsize) {
 913		trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
 914		error = iomap_zero_range(inode, oldsize, newsize - oldsize,
 915				&did_zeroing, &xfs_buffered_write_iomap_ops);
 916	} else {
 917		/*
 918		 * iomap won't detect a dirty page over an unwritten block (or a
 919		 * cow block over a hole) and subsequently skips zeroing the
 920		 * newly post-EOF portion of the page. Flush the new EOF to
 921		 * convert the block before the pagecache truncate.
 922		 */
 923		error = filemap_write_and_wait_range(inode->i_mapping, newsize,
 924						     newsize);
 925		if (error)
 926			return error;
 927		error = iomap_truncate_page(inode, newsize, &did_zeroing,
 928				&xfs_buffered_write_iomap_ops);
 929	}
 930
 931	if (error)
 932		return error;
 933
 934	/*
 935	 * We've already locked out new page faults, so now we can safely remove
 936	 * pages from the page cache knowing they won't get refaulted until we
 937	 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
 938	 * complete. The truncate_setsize() call also cleans partial EOF page
 939	 * PTEs on extending truncates and hence ensures sub-page block size
 940	 * filesystems are correctly handled, too.
 941	 *
 942	 * We have to do all the page cache truncate work outside the
 943	 * transaction context as the "lock" order is page lock->log space
 944	 * reservation as defined by extent allocation in the writeback path.
 945	 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
 946	 * having already truncated the in-memory version of the file (i.e. made
 947	 * user visible changes). There's not much we can do about this, except
 948	 * to hope that the caller sees ENOMEM and retries the truncate
 949	 * operation.
 950	 *
 951	 * And we update in-core i_size and truncate page cache beyond newsize
 952	 * before writeback the [i_disk_size, newsize] range, so we're
 953	 * guaranteed not to write stale data past the new EOF on truncate down.
 954	 */
 955	truncate_setsize(inode, newsize);
 956
 957	/*
 958	 * We are going to log the inode size change in this transaction so
 959	 * any previous writes that are beyond the on disk EOF and the new
 960	 * EOF that have not been written out need to be written here.  If we
 961	 * do not write the data out, we expose ourselves to the null files
 962	 * problem. Note that this includes any block zeroing we did above;
 963	 * otherwise those blocks may not be zeroed after a crash.
 964	 */
 965	if (did_zeroing ||
 966	    (newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) {
 967		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
 968						ip->i_disk_size, newsize - 1);
 969		if (error)
 970			return error;
 971	}
 972
 973	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
 974	if (error)
 975		return error;
 976
 977	lock_flags |= XFS_ILOCK_EXCL;
 978	xfs_ilock(ip, XFS_ILOCK_EXCL);
 979	xfs_trans_ijoin(tp, ip, 0);
 980
 981	/*
 982	 * Only change the c/mtime if we are changing the size or we are
 983	 * explicitly asked to change it.  This handles the semantic difference
 984	 * between truncate() and ftruncate() as implemented in the VFS.
 985	 *
 986	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
 987	 * special case where we need to update the times despite not having
 988	 * these flags set.  For all other operations the VFS set these flags
 989	 * explicitly if it wants a timestamp update.
 990	 */
 991	if (newsize != oldsize &&
 992	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
 993		iattr->ia_ctime = iattr->ia_mtime =
 994			current_time(inode);
 995		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 996	}
 997
 998	/*
 999	 * The first thing we do is set the size to new_size permanently on
1000	 * disk.  This way we don't have to worry about anyone ever being able
1001	 * to look at the data being freed even in the face of a crash.
1002	 * What we're getting around here is the case where we free a block, it
1003	 * is allocated to another file, it is written to, and then we crash.
1004	 * If the new data gets written to the file but the log buffers
1005	 * containing the free and reallocation don't, then we'd end up with
1006	 * garbage in the blocks being freed.  As long as we make the new size
1007	 * permanent before actually freeing any blocks it doesn't matter if
1008	 * they get written to.
1009	 */
1010	ip->i_disk_size = newsize;
1011	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1012
1013	if (newsize <= oldsize) {
1014		error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
1015		if (error)
1016			goto out_trans_cancel;
1017
1018		/*
1019		 * Truncated "down", so we're removing references to old data
1020		 * here - if we delay flushing for a long time, we expose
1021		 * ourselves unduly to the notorious NULL files problem.  So,
1022		 * we mark this inode and flush it when the file is closed,
1023		 * and do not wait the usual (long) time for writeout.
1024		 */
1025		xfs_iflags_set(ip, XFS_ITRUNCATED);
1026
1027		/* A truncate down always removes post-EOF blocks. */
1028		xfs_inode_clear_eofblocks_tag(ip);
1029	}
1030
1031	if (iattr->ia_valid & ATTR_MODE)
1032		xfs_setattr_mode(ip, iattr);
1033	if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
1034		xfs_setattr_time(ip, iattr);
1035
1036	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1037
1038	XFS_STATS_INC(mp, xs_ig_attrchg);
1039
1040	if (mp->m_flags & XFS_MOUNT_WSYNC)
1041		xfs_trans_set_sync(tp);
1042
1043	error = xfs_trans_commit(tp);
1044out_unlock:
1045	if (lock_flags)
1046		xfs_iunlock(ip, lock_flags);
1047	return error;
1048
1049out_trans_cancel:
1050	xfs_trans_cancel(tp);
1051	goto out_unlock;
1052}
1053
1054int
1055xfs_vn_setattr_size(
1056	struct user_namespace	*mnt_userns,
1057	struct dentry		*dentry,
1058	struct iattr		*iattr)
1059{
1060	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
1061	int error;
1062
1063	trace_xfs_setattr(ip);
1064
1065	error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
1066	if (error)
1067		return error;
1068	return xfs_setattr_size(mnt_userns, ip, iattr);
1069}
1070
1071STATIC int
1072xfs_vn_setattr(
1073	struct user_namespace	*mnt_userns,
1074	struct dentry		*dentry,
1075	struct iattr		*iattr)
1076{
1077	struct inode		*inode = d_inode(dentry);
1078	struct xfs_inode	*ip = XFS_I(inode);
1079	int			error;
1080
1081	if (iattr->ia_valid & ATTR_SIZE) {
 
 
1082		uint			iolock;
1083
1084		xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1085		iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1086
1087		error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1088		if (error) {
1089			xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1090			return error;
1091		}
1092
1093		error = xfs_vn_setattr_size(mnt_userns, dentry, iattr);
1094		xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1095	} else {
1096		trace_xfs_setattr(ip);
1097
1098		error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
1099		if (!error)
1100			error = xfs_setattr_nonsize(mnt_userns, ip, iattr);
1101	}
1102
1103	return error;
1104}
1105
1106STATIC int
1107xfs_vn_update_time(
1108	struct inode		*inode,
1109	struct timespec64	*now,
1110	int			flags)
1111{
1112	struct xfs_inode	*ip = XFS_I(inode);
1113	struct xfs_mount	*mp = ip->i_mount;
1114	int			log_flags = XFS_ILOG_TIMESTAMP;
1115	struct xfs_trans	*tp;
1116	int			error;
1117
1118	trace_xfs_update_time(ip);
1119
1120	if (inode->i_sb->s_flags & SB_LAZYTIME) {
1121		if (!((flags & S_VERSION) &&
1122		      inode_maybe_inc_iversion(inode, false)))
1123			return generic_update_time(inode, now, flags);
1124
1125		/* Capture the iversion update that just occurred */
1126		log_flags |= XFS_ILOG_CORE;
1127	}
1128
1129	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1130	if (error)
1131		return error;
1132
1133	xfs_ilock(ip, XFS_ILOCK_EXCL);
1134	if (flags & S_CTIME)
1135		inode->i_ctime = *now;
1136	if (flags & S_MTIME)
1137		inode->i_mtime = *now;
1138	if (flags & S_ATIME)
1139		inode->i_atime = *now;
1140
1141	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1142	xfs_trans_log_inode(tp, ip, log_flags);
1143	return xfs_trans_commit(tp);
1144}
1145
1146STATIC int
1147xfs_vn_fiemap(
1148	struct inode		*inode,
1149	struct fiemap_extent_info *fieinfo,
1150	u64			start,
1151	u64			length)
1152{
1153	int			error;
1154
1155	xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1156	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1157		fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1158		error = iomap_fiemap(inode, fieinfo, start, length,
1159				&xfs_xattr_iomap_ops);
1160	} else {
1161		error = iomap_fiemap(inode, fieinfo, start, length,
1162				&xfs_read_iomap_ops);
1163	}
1164	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1165
1166	return error;
1167}
1168
1169STATIC int
1170xfs_vn_tmpfile(
1171	struct user_namespace	*mnt_userns,
1172	struct inode		*dir,
1173	struct dentry		*dentry,
1174	umode_t			mode)
1175{
1176	return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, true);
1177}
1178
1179static const struct inode_operations xfs_inode_operations = {
1180	.get_acl		= xfs_get_acl,
1181	.set_acl		= xfs_set_acl,
1182	.getattr		= xfs_vn_getattr,
1183	.setattr		= xfs_vn_setattr,
1184	.listxattr		= xfs_vn_listxattr,
1185	.fiemap			= xfs_vn_fiemap,
1186	.update_time		= xfs_vn_update_time,
1187	.fileattr_get		= xfs_fileattr_get,
1188	.fileattr_set		= xfs_fileattr_set,
1189};
1190
1191static const struct inode_operations xfs_dir_inode_operations = {
1192	.create			= xfs_vn_create,
1193	.lookup			= xfs_vn_lookup,
1194	.link			= xfs_vn_link,
1195	.unlink			= xfs_vn_unlink,
1196	.symlink		= xfs_vn_symlink,
1197	.mkdir			= xfs_vn_mkdir,
1198	/*
1199	 * Yes, XFS uses the same method for rmdir and unlink.
1200	 *
1201	 * There are some subtile differences deeper in the code,
1202	 * but we use S_ISDIR to check for those.
1203	 */
1204	.rmdir			= xfs_vn_unlink,
1205	.mknod			= xfs_vn_mknod,
1206	.rename			= xfs_vn_rename,
1207	.get_acl		= xfs_get_acl,
1208	.set_acl		= xfs_set_acl,
1209	.getattr		= xfs_vn_getattr,
1210	.setattr		= xfs_vn_setattr,
1211	.listxattr		= xfs_vn_listxattr,
1212	.update_time		= xfs_vn_update_time,
1213	.tmpfile		= xfs_vn_tmpfile,
1214	.fileattr_get		= xfs_fileattr_get,
1215	.fileattr_set		= xfs_fileattr_set,
1216};
1217
1218static const struct inode_operations xfs_dir_ci_inode_operations = {
1219	.create			= xfs_vn_create,
1220	.lookup			= xfs_vn_ci_lookup,
1221	.link			= xfs_vn_link,
1222	.unlink			= xfs_vn_unlink,
1223	.symlink		= xfs_vn_symlink,
1224	.mkdir			= xfs_vn_mkdir,
1225	/*
1226	 * Yes, XFS uses the same method for rmdir and unlink.
1227	 *
1228	 * There are some subtile differences deeper in the code,
1229	 * but we use S_ISDIR to check for those.
1230	 */
1231	.rmdir			= xfs_vn_unlink,
1232	.mknod			= xfs_vn_mknod,
1233	.rename			= xfs_vn_rename,
1234	.get_acl		= xfs_get_acl,
1235	.set_acl		= xfs_set_acl,
1236	.getattr		= xfs_vn_getattr,
1237	.setattr		= xfs_vn_setattr,
1238	.listxattr		= xfs_vn_listxattr,
1239	.update_time		= xfs_vn_update_time,
1240	.tmpfile		= xfs_vn_tmpfile,
1241	.fileattr_get		= xfs_fileattr_get,
1242	.fileattr_set		= xfs_fileattr_set,
1243};
1244
1245static const struct inode_operations xfs_symlink_inode_operations = {
1246	.get_link		= xfs_vn_get_link,
1247	.getattr		= xfs_vn_getattr,
1248	.setattr		= xfs_vn_setattr,
1249	.listxattr		= xfs_vn_listxattr,
1250	.update_time		= xfs_vn_update_time,
1251};
1252
1253static const struct inode_operations xfs_inline_symlink_inode_operations = {
1254	.get_link		= xfs_vn_get_link_inline,
1255	.getattr		= xfs_vn_getattr,
1256	.setattr		= xfs_vn_setattr,
1257	.listxattr		= xfs_vn_listxattr,
1258	.update_time		= xfs_vn_update_time,
1259};
1260
1261/* Figure out if this file actually supports DAX. */
1262static bool
1263xfs_inode_supports_dax(
1264	struct xfs_inode	*ip)
1265{
1266	struct xfs_mount	*mp = ip->i_mount;
1267
1268	/* Only supported on regular files. */
1269	if (!S_ISREG(VFS_I(ip)->i_mode))
1270		return false;
1271
1272	/* Only supported on non-reflinked files. */
1273	if (xfs_is_reflink_inode(ip))
1274		return false;
1275
1276	/* Block size must match page size */
1277	if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1278		return false;
1279
1280	/* Device has to support DAX too. */
1281	return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1282}
1283
1284static bool
1285xfs_inode_should_enable_dax(
1286	struct xfs_inode *ip)
1287{
1288	if (!IS_ENABLED(CONFIG_FS_DAX))
1289		return false;
1290	if (ip->i_mount->m_flags & XFS_MOUNT_DAX_NEVER)
1291		return false;
1292	if (!xfs_inode_supports_dax(ip))
1293		return false;
1294	if (ip->i_mount->m_flags & XFS_MOUNT_DAX_ALWAYS)
1295		return true;
1296	if (ip->i_diflags2 & XFS_DIFLAG2_DAX)
1297		return true;
1298	return false;
1299}
1300
1301void
1302xfs_diflags_to_iflags(
1303	struct xfs_inode	*ip,
1304	bool init)
1305{
1306	struct inode            *inode = VFS_I(ip);
1307	unsigned int            xflags = xfs_ip2xflags(ip);
1308	unsigned int            flags = 0;
1309
1310	ASSERT(!(IS_DAX(inode) && init));
1311
1312	if (xflags & FS_XFLAG_IMMUTABLE)
1313		flags |= S_IMMUTABLE;
1314	if (xflags & FS_XFLAG_APPEND)
1315		flags |= S_APPEND;
1316	if (xflags & FS_XFLAG_SYNC)
1317		flags |= S_SYNC;
1318	if (xflags & FS_XFLAG_NOATIME)
1319		flags |= S_NOATIME;
1320	if (init && xfs_inode_should_enable_dax(ip))
1321		flags |= S_DAX;
1322
1323	/*
1324	 * S_DAX can only be set during inode initialization and is never set by
1325	 * the VFS, so we cannot mask off S_DAX in i_flags.
1326	 */
1327	inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1328	inode->i_flags |= flags;
1329}
1330
1331/*
1332 * Initialize the Linux inode.
1333 *
1334 * When reading existing inodes from disk this is called directly from xfs_iget,
1335 * when creating a new inode it is called from xfs_ialloc after setting up the
1336 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1337 * it up to the caller to deal with unlocking the inode appropriately.
1338 */
1339void
1340xfs_setup_inode(
1341	struct xfs_inode	*ip)
1342{
1343	struct inode		*inode = &ip->i_vnode;
1344	gfp_t			gfp_mask;
1345
1346	inode->i_ino = ip->i_ino;
1347	inode->i_state = I_NEW;
1348
1349	inode_sb_list_add(inode);
1350	/* make the inode look hashed for the writeback code */
1351	inode_fake_hash(inode);
1352
1353	i_size_write(inode, ip->i_disk_size);
1354	xfs_diflags_to_iflags(ip, true);
1355
1356	if (S_ISDIR(inode->i_mode)) {
1357		/*
1358		 * We set the i_rwsem class here to avoid potential races with
1359		 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1360		 * after a filehandle lookup has already found the inode in
1361		 * cache before it has been unlocked via unlock_new_inode().
1362		 */
1363		lockdep_set_class(&inode->i_rwsem,
1364				  &inode->i_sb->s_type->i_mutex_dir_key);
1365		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1366	} else {
1367		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1368	}
1369
1370	/*
1371	 * Ensure all page cache allocations are done from GFP_NOFS context to
1372	 * prevent direct reclaim recursion back into the filesystem and blowing
1373	 * stacks or deadlocking.
1374	 */
1375	gfp_mask = mapping_gfp_mask(inode->i_mapping);
1376	mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1377
1378	/*
1379	 * If there is no attribute fork no ACL can exist on this inode,
1380	 * and it can't have any file capabilities attached to it either.
1381	 */
1382	if (!XFS_IFORK_Q(ip)) {
1383		inode_has_no_xattr(inode);
1384		cache_no_acl(inode);
1385	}
1386}
1387
1388void
1389xfs_setup_iops(
1390	struct xfs_inode	*ip)
1391{
1392	struct inode		*inode = &ip->i_vnode;
1393
1394	switch (inode->i_mode & S_IFMT) {
1395	case S_IFREG:
1396		inode->i_op = &xfs_inode_operations;
1397		inode->i_fop = &xfs_file_operations;
1398		if (IS_DAX(inode))
1399			inode->i_mapping->a_ops = &xfs_dax_aops;
1400		else
1401			inode->i_mapping->a_ops = &xfs_address_space_operations;
1402		break;
1403	case S_IFDIR:
1404		if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1405			inode->i_op = &xfs_dir_ci_inode_operations;
1406		else
1407			inode->i_op = &xfs_dir_inode_operations;
1408		inode->i_fop = &xfs_dir_file_operations;
1409		break;
1410	case S_IFLNK:
1411		if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL)
1412			inode->i_op = &xfs_inline_symlink_inode_operations;
1413		else
1414			inode->i_op = &xfs_symlink_inode_operations;
1415		break;
1416	default:
1417		inode->i_op = &xfs_inode_operations;
1418		init_special_inode(inode, inode->i_mode, inode->i_rdev);
1419		break;
1420	}
1421}