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_trans_space.h"
  21#include "xfs_bmap_btree.h"
  22#include "xfs_trace.h"
  23#include "xfs_icache.h"
  24#include "xfs_symlink.h"
  25#include "xfs_dir2.h"
  26#include "xfs_iomap.h"
  27#include "xfs_error.h"
  28#include "xfs_ioctl.h"
  29#include "xfs_xattr.h"
  30#include "xfs_file.h"
  31#include "xfs_bmap.h"
  32
 
  33#include <linux/posix_acl.h>
  34#include <linux/security.h>
  35#include <linux/iversion.h>
  36#include <linux/fiemap.h>
  37
  38/*
  39 * Directories have different lock order w.r.t. mmap_lock compared to regular
  40 * files. This is due to readdir potentially triggering page faults on a user
  41 * buffer inside filldir(), and this happens with the ilock on the directory
  42 * held. For regular files, the lock order is the other way around - the
  43 * mmap_lock is taken during the page fault, and then we lock the ilock to do
  44 * block mapping. Hence we need a different class for the directory ilock so
  45 * that lockdep can tell them apart.  Directories in the metadata directory
  46 * tree get a separate class so that lockdep reports will warn us if someone
  47 * ever tries to lock regular directories after locking metadata directories.
  48 */
  49static struct lock_class_key xfs_nondir_ilock_class;
  50static struct lock_class_key xfs_dir_ilock_class;
  51
  52static int
  53xfs_initxattrs(
  54	struct inode		*inode,
  55	const struct xattr	*xattr_array,
  56	void			*fs_info)
  57{
  58	const struct xattr	*xattr;
  59	struct xfs_inode	*ip = XFS_I(inode);
  60	int			error = 0;
  61
  62	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  63		struct xfs_da_args	args = {
  64			.dp		= ip,
  65			.attr_filter	= XFS_ATTR_SECURE,
  66			.name		= xattr->name,
  67			.namelen	= strlen(xattr->name),
  68			.value		= xattr->value,
  69			.valuelen	= xattr->value_len,
  70		};
  71		error = xfs_attr_change(&args, XFS_ATTRUPDATE_UPSERT);
  72		if (error < 0)
  73			break;
  74	}
  75	return error;
  76}
  77
  78/*
  79 * Hook in SELinux.  This is not quite correct yet, what we really need
  80 * here (as we do for default ACLs) is a mechanism by which creation of
  81 * these attrs can be journalled at inode creation time (along with the
  82 * inode, of course, such that log replay can't cause these to be lost).
  83 */
  84int
  85xfs_inode_init_security(
 
  86	struct inode	*inode,
  87	struct inode	*dir,
  88	const struct qstr *qstr)
  89{
  90	return security_inode_init_security(inode, dir, qstr,
  91					     &xfs_initxattrs, NULL);
  92}
  93
  94static void
  95xfs_dentry_to_name(
  96	struct xfs_name	*namep,
  97	struct dentry	*dentry)
  98{
  99	namep->name = dentry->d_name.name;
 100	namep->len = dentry->d_name.len;
 101	namep->type = XFS_DIR3_FT_UNKNOWN;
 102}
 103
 104static int
 105xfs_dentry_mode_to_name(
 106	struct xfs_name	*namep,
 107	struct dentry	*dentry,
 108	int		mode)
 109{
 110	namep->name = dentry->d_name.name;
 111	namep->len = dentry->d_name.len;
 112	namep->type = xfs_mode_to_ftype(mode);
 113
 114	if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
 115		return -EFSCORRUPTED;
 116
 117	return 0;
 118}
 119
 120STATIC void
 121xfs_cleanup_inode(
 122	struct inode	*dir,
 123	struct inode	*inode,
 124	struct dentry	*dentry)
 125{
 126	struct xfs_name	teardown;
 127
 128	/* Oh, the horror.
 129	 * If we can't add the ACL or we fail in
 130	 * xfs_inode_init_security we must back out.
 131	 * ENOSPC can hit here, among other things.
 132	 */
 133	xfs_dentry_to_name(&teardown, dentry);
 134
 135	xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
 136}
 137
 138/*
 139 * Check to see if we are likely to need an extended attribute to be added to
 140 * the inode we are about to allocate. This allows the attribute fork to be
 141 * created during the inode allocation, reducing the number of transactions we
 142 * need to do in this fast path.
 143 *
 144 * The security checks are optimistic, but not guaranteed. The two LSMs that
 145 * require xattrs to be added here (selinux and smack) are also the only two
 146 * LSMs that add a sb->s_security structure to the superblock. Hence if security
 147 * is enabled and sb->s_security is set, we have a pretty good idea that we are
 148 * going to be asked to add a security xattr immediately after allocating the
 149 * xfs inode and instantiating the VFS inode.
 150 */
 151static inline bool
 152xfs_create_need_xattr(
 153	struct inode	*dir,
 154	struct posix_acl *default_acl,
 155	struct posix_acl *acl)
 156{
 157	if (acl)
 158		return true;
 159	if (default_acl)
 160		return true;
 161#if IS_ENABLED(CONFIG_SECURITY)
 162	if (dir->i_sb->s_security)
 163		return true;
 164#endif
 165	return false;
 166}
 167
 168
 169STATIC int
 170xfs_generic_create(
 171	struct mnt_idmap	*idmap,
 172	struct inode		*dir,
 173	struct dentry		*dentry,
 174	umode_t			mode,
 175	dev_t			rdev,
 176	struct file		*tmpfile)	/* unnamed file */
 177{
 178	struct xfs_icreate_args	args = {
 179		.idmap		= idmap,
 180		.pip		= XFS_I(dir),
 181		.rdev		= rdev,
 182		.mode		= mode,
 183	};
 184	struct inode		*inode;
 185	struct xfs_inode	*ip = NULL;
 186	struct posix_acl	*default_acl, *acl;
 187	struct xfs_name		name;
 188	int			error;
 189
 190	/*
 191	 * Irix uses Missed'em'V split, but doesn't want to see
 192	 * the upper 5 bits of (14bit) major.
 193	 */
 194	if (S_ISCHR(args.mode) || S_ISBLK(args.mode)) {
 195		if (unlikely(!sysv_valid_dev(args.rdev) ||
 196			     MAJOR(args.rdev) & ~0x1ff))
 197			return -EINVAL;
 198	} else {
 199		args.rdev = 0;
 200	}
 201
 202	error = posix_acl_create(dir, &args.mode, &default_acl, &acl);
 203	if (error)
 204		return error;
 205
 206	/* Verify mode is valid also for tmpfile case */
 207	error = xfs_dentry_mode_to_name(&name, dentry, args.mode);
 208	if (unlikely(error))
 209		goto out_free_acl;
 210
 211	if (!tmpfile) {
 212		if (xfs_create_need_xattr(dir, default_acl, acl))
 213			args.flags |= XFS_ICREATE_INIT_XATTRS;
 214
 215		error = xfs_create(&args, &name, &ip);
 216	} else {
 217		args.flags |= XFS_ICREATE_TMPFILE;
 218
 219		/*
 220		 * If this temporary file will not be linkable, don't bother
 221		 * creating an attr fork to receive a parent pointer.
 222		 */
 223		if (tmpfile->f_flags & O_EXCL)
 224			args.flags |= XFS_ICREATE_UNLINKABLE;
 225
 226		error = xfs_create_tmpfile(&args, &ip);
 227	}
 228	if (unlikely(error))
 229		goto out_free_acl;
 230
 231	inode = VFS_I(ip);
 232
 233	error = xfs_inode_init_security(inode, dir, &dentry->d_name);
 234	if (unlikely(error))
 235		goto out_cleanup_inode;
 236
 
 237	if (default_acl) {
 238		error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 239		if (error)
 240			goto out_cleanup_inode;
 241	}
 242	if (acl) {
 243		error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
 244		if (error)
 245			goto out_cleanup_inode;
 246	}
 
 247
 248	xfs_setup_iops(ip);
 249
 250	if (tmpfile) {
 251		/*
 252		 * The VFS requires that any inode fed to d_tmpfile must have
 253		 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
 254		 * However, we created the temp file with nlink == 0 because
 255		 * we're not allowed to put an inode with nlink > 0 on the
 256		 * unlinked list.  Therefore we have to set nlink to 1 so that
 257		 * d_tmpfile can immediately set it back to zero.
 258		 */
 259		set_nlink(inode, 1);
 260		d_tmpfile(tmpfile, inode);
 261	} else
 262		d_instantiate(dentry, inode);
 263
 264	xfs_finish_inode_setup(ip);
 265
 266 out_free_acl:
 267	posix_acl_release(default_acl);
 268	posix_acl_release(acl);
 
 
 269	return error;
 270
 271 out_cleanup_inode:
 272	xfs_finish_inode_setup(ip);
 273	if (!tmpfile)
 274		xfs_cleanup_inode(dir, inode, dentry);
 275	xfs_irele(ip);
 276	goto out_free_acl;
 277}
 278
 279STATIC int
 280xfs_vn_mknod(
 281	struct mnt_idmap	*idmap,
 282	struct inode		*dir,
 283	struct dentry		*dentry,
 284	umode_t			mode,
 285	dev_t			rdev)
 286{
 287	return xfs_generic_create(idmap, dir, dentry, mode, rdev, NULL);
 288}
 289
 290STATIC int
 291xfs_vn_create(
 292	struct mnt_idmap	*idmap,
 293	struct inode		*dir,
 294	struct dentry		*dentry,
 295	umode_t			mode,
 296	bool			flags)
 297{
 298	return xfs_generic_create(idmap, dir, dentry, mode, 0, NULL);
 299}
 300
 301STATIC int
 302xfs_vn_mkdir(
 303	struct mnt_idmap	*idmap,
 304	struct inode		*dir,
 305	struct dentry		*dentry,
 306	umode_t			mode)
 307{
 308	return xfs_generic_create(idmap, dir, dentry, mode | S_IFDIR, 0, NULL);
 309}
 310
 311STATIC struct dentry *
 312xfs_vn_lookup(
 313	struct inode	*dir,
 314	struct dentry	*dentry,
 315	unsigned int flags)
 316{
 317	struct inode *inode;
 318	struct xfs_inode *cip;
 319	struct xfs_name	name;
 320	int		error;
 321
 322	if (dentry->d_name.len >= MAXNAMELEN)
 323		return ERR_PTR(-ENAMETOOLONG);
 324
 325	xfs_dentry_to_name(&name, dentry);
 326	error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
 327	if (likely(!error))
 328		inode = VFS_I(cip);
 329	else if (likely(error == -ENOENT))
 330		inode = NULL;
 331	else
 332		inode = ERR_PTR(error);
 333	return d_splice_alias(inode, dentry);
 334}
 335
 336STATIC struct dentry *
 337xfs_vn_ci_lookup(
 338	struct inode	*dir,
 339	struct dentry	*dentry,
 340	unsigned int flags)
 341{
 342	struct xfs_inode *ip;
 343	struct xfs_name	xname;
 344	struct xfs_name ci_name;
 345	struct qstr	dname;
 346	int		error;
 347
 348	if (dentry->d_name.len >= MAXNAMELEN)
 349		return ERR_PTR(-ENAMETOOLONG);
 350
 351	xfs_dentry_to_name(&xname, dentry);
 352	error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
 353	if (unlikely(error)) {
 354		if (unlikely(error != -ENOENT))
 355			return ERR_PTR(error);
 356		/*
 357		 * call d_add(dentry, NULL) here when d_drop_negative_children
 358		 * is called in xfs_vn_mknod (ie. allow negative dentries
 359		 * with CI filesystems).
 360		 */
 361		return NULL;
 362	}
 363
 364	/* if exact match, just splice and exit */
 365	if (!ci_name.name)
 366		return d_splice_alias(VFS_I(ip), dentry);
 367
 368	/* else case-insensitive match... */
 369	dname.name = ci_name.name;
 370	dname.len = ci_name.len;
 371	dentry = d_add_ci(dentry, VFS_I(ip), &dname);
 372	kfree(ci_name.name);
 373	return dentry;
 374}
 375
 376STATIC int
 377xfs_vn_link(
 378	struct dentry	*old_dentry,
 379	struct inode	*dir,
 380	struct dentry	*dentry)
 381{
 382	struct inode	*inode = d_inode(old_dentry);
 383	struct xfs_name	name;
 384	int		error;
 385
 386	error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
 387	if (unlikely(error))
 388		return error;
 389
 390	if (IS_PRIVATE(inode))
 391		return -EPERM;
 392
 393	error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
 394	if (unlikely(error))
 395		return error;
 396
 397	ihold(inode);
 398	d_instantiate(dentry, inode);
 399	return 0;
 400}
 401
 402STATIC int
 403xfs_vn_unlink(
 404	struct inode	*dir,
 405	struct dentry	*dentry)
 406{
 407	struct xfs_name	name;
 408	int		error;
 409
 410	xfs_dentry_to_name(&name, dentry);
 411
 412	error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
 413	if (error)
 414		return error;
 415
 416	/*
 417	 * With unlink, the VFS makes the dentry "negative": no inode,
 418	 * but still hashed. This is incompatible with case-insensitive
 419	 * mode, so invalidate (unhash) the dentry in CI-mode.
 420	 */
 421	if (xfs_has_asciici(XFS_M(dir->i_sb)))
 422		d_invalidate(dentry);
 423	return 0;
 424}
 425
 426STATIC int
 427xfs_vn_symlink(
 428	struct mnt_idmap	*idmap,
 429	struct inode		*dir,
 430	struct dentry		*dentry,
 431	const char		*symname)
 432{
 433	struct inode	*inode;
 434	struct xfs_inode *cip = NULL;
 435	struct xfs_name	name;
 436	int		error;
 437	umode_t		mode;
 438
 439	mode = S_IFLNK |
 440		(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
 441	error = xfs_dentry_mode_to_name(&name, dentry, mode);
 442	if (unlikely(error))
 443		goto out;
 444
 445	error = xfs_symlink(idmap, XFS_I(dir), &name, symname, mode, &cip);
 446	if (unlikely(error))
 447		goto out;
 448
 449	inode = VFS_I(cip);
 450
 451	error = xfs_inode_init_security(inode, dir, &dentry->d_name);
 452	if (unlikely(error))
 453		goto out_cleanup_inode;
 454
 455	xfs_setup_iops(cip);
 456
 457	d_instantiate(dentry, inode);
 458	xfs_finish_inode_setup(cip);
 459	return 0;
 460
 461 out_cleanup_inode:
 462	xfs_finish_inode_setup(cip);
 463	xfs_cleanup_inode(dir, inode, dentry);
 464	xfs_irele(cip);
 465 out:
 466	return error;
 467}
 468
 469STATIC int
 470xfs_vn_rename(
 471	struct mnt_idmap	*idmap,
 472	struct inode		*odir,
 473	struct dentry		*odentry,
 474	struct inode		*ndir,
 475	struct dentry		*ndentry,
 476	unsigned int		flags)
 477{
 478	struct inode	*new_inode = d_inode(ndentry);
 479	int		omode = 0;
 480	int		error;
 481	struct xfs_name	oname;
 482	struct xfs_name	nname;
 483
 484	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 485		return -EINVAL;
 486
 487	/* if we are exchanging files, we need to set i_mode of both files */
 488	if (flags & RENAME_EXCHANGE)
 489		omode = d_inode(ndentry)->i_mode;
 490
 491	error = xfs_dentry_mode_to_name(&oname, odentry, omode);
 492	if (omode && unlikely(error))
 493		return error;
 494
 495	error = xfs_dentry_mode_to_name(&nname, ndentry,
 496					d_inode(odentry)->i_mode);
 497	if (unlikely(error))
 498		return error;
 499
 500	return xfs_rename(idmap, XFS_I(odir), &oname,
 501			  XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
 502			  new_inode ? XFS_I(new_inode) : NULL, flags);
 503}
 504
 505/*
 506 * careful here - this function can get called recursively, so
 507 * we need to be very careful about how much stack we use.
 508 * uio is kmalloced for this reason...
 509 */
 510STATIC const char *
 511xfs_vn_get_link(
 512	struct dentry		*dentry,
 513	struct inode		*inode,
 514	struct delayed_call	*done)
 515{
 516	char			*link;
 517	int			error = -ENOMEM;
 518
 519	if (!dentry)
 520		return ERR_PTR(-ECHILD);
 521
 522	link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
 523	if (!link)
 524		goto out_err;
 525
 526	error = xfs_readlink(XFS_I(d_inode(dentry)), link);
 527	if (unlikely(error))
 528		goto out_kfree;
 529
 530	set_delayed_call(done, kfree_link, link);
 531	return link;
 532
 533 out_kfree:
 534	kfree(link);
 535 out_err:
 536	return ERR_PTR(error);
 537}
 538
 539static uint32_t
 540xfs_stat_blksize(
 541	struct xfs_inode	*ip)
 
 
 542{
 543	struct xfs_mount	*mp = ip->i_mount;
 544
 545	/*
 546	 * If the file blocks are being allocated from a realtime volume, then
 547	 * always return the realtime extent size.
 548	 */
 549	if (XFS_IS_REALTIME_INODE(ip))
 550		return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip) ? : 1);
 551
 552	/*
 553	 * Allow large block sizes to be reported to userspace programs if the
 554	 * "largeio" mount option is used.
 555	 *
 556	 * If compatibility mode is specified, simply return the basic unit of
 557	 * caching so that we don't get inefficient read/modify/write I/O from
 558	 * user apps. Otherwise....
 559	 *
 560	 * If the underlying volume is a stripe, then return the stripe width in
 561	 * bytes as the recommended I/O size. It is not a stripe and we've set a
 562	 * default buffered I/O size, return that, otherwise return the compat
 563	 * default.
 564	 */
 565	if (xfs_has_large_iosize(mp)) {
 566		if (mp->m_swidth)
 567			return XFS_FSB_TO_B(mp, mp->m_swidth);
 568		if (xfs_has_allocsize(mp))
 569			return 1U << mp->m_allocsize_log;
 570	}
 571
 572	return max_t(uint32_t, PAGE_SIZE, mp->m_sb.sb_blocksize);
 573}
 574
 575static void
 576xfs_get_atomic_write_attr(
 577	struct xfs_inode	*ip,
 578	unsigned int		*unit_min,
 579	unsigned int		*unit_max)
 580{
 581	if (!xfs_inode_can_atomicwrite(ip)) {
 582		*unit_min = *unit_max = 0;
 583		return;
 584	}
 585
 586	*unit_min = *unit_max = ip->i_mount->m_sb.sb_blocksize;
 587}
 588
 589STATIC int
 590xfs_vn_getattr(
 591	struct mnt_idmap	*idmap,
 592	const struct path	*path,
 593	struct kstat		*stat,
 594	u32			request_mask,
 595	unsigned int		query_flags)
 596{
 597	struct inode		*inode = d_inode(path->dentry);
 598	struct xfs_inode	*ip = XFS_I(inode);
 599	struct xfs_mount	*mp = ip->i_mount;
 600	vfsuid_t		vfsuid = i_uid_into_vfsuid(idmap, inode);
 601	vfsgid_t		vfsgid = i_gid_into_vfsgid(idmap, inode);
 602
 603	trace_xfs_getattr(ip);
 604
 605	if (xfs_is_shutdown(mp))
 606		return -EIO;
 607
 608	stat->size = XFS_ISIZE(ip);
 609	stat->dev = inode->i_sb->s_dev;
 610	stat->mode = inode->i_mode;
 611	stat->nlink = inode->i_nlink;
 612	stat->uid = vfsuid_into_kuid(vfsuid);
 613	stat->gid = vfsgid_into_kgid(vfsgid);
 614	stat->ino = ip->i_ino;
 615	stat->atime = inode_get_atime(inode);
 616
 617	fill_mg_cmtime(stat, request_mask, inode);
 
 
 618
 619	stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
 620
 621	if (xfs_has_v3inodes(mp)) {
 622		if (request_mask & STATX_BTIME) {
 623			stat->result_mask |= STATX_BTIME;
 624			stat->btime = ip->i_crtime;
 
 625		}
 626	}
 627
 628	/*
 629	 * Note: If you add another clause to set an attribute flag, please
 630	 * update attributes_mask below.
 631	 */
 632	if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE)
 633		stat->attributes |= STATX_ATTR_IMMUTABLE;
 634	if (ip->i_diflags & XFS_DIFLAG_APPEND)
 635		stat->attributes |= STATX_ATTR_APPEND;
 636	if (ip->i_diflags & XFS_DIFLAG_NODUMP)
 637		stat->attributes |= STATX_ATTR_NODUMP;
 638
 639	stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
 640				  STATX_ATTR_APPEND |
 641				  STATX_ATTR_NODUMP);
 642
 643	switch (inode->i_mode & S_IFMT) {
 644	case S_IFBLK:
 645	case S_IFCHR:
 646		stat->blksize = BLKDEV_IOSIZE;
 647		stat->rdev = inode->i_rdev;
 648		break;
 649	case S_IFREG:
 650		if (request_mask & STATX_DIOALIGN) {
 651			struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
 652			struct block_device	*bdev = target->bt_bdev;
 653
 654			stat->result_mask |= STATX_DIOALIGN;
 655			stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
 656			stat->dio_offset_align = bdev_logical_block_size(bdev);
 657		}
 658		if (request_mask & STATX_WRITE_ATOMIC) {
 659			unsigned int	unit_min, unit_max;
 660
 661			xfs_get_atomic_write_attr(ip, &unit_min,
 662					&unit_max);
 663			generic_fill_statx_atomic_writes(stat,
 664					unit_min, unit_max);
 665		}
 666		fallthrough;
 667	default:
 668		stat->blksize = xfs_stat_blksize(ip);
 
 
 
 
 
 
 
 
 
 669		stat->rdev = 0;
 670		break;
 671	}
 672
 673	return 0;
 674}
 675
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 676static int
 677xfs_vn_change_ok(
 678	struct mnt_idmap	*idmap,
 679	struct dentry		*dentry,
 680	struct iattr		*iattr)
 681{
 682	struct xfs_mount	*mp = XFS_I(d_inode(dentry))->i_mount;
 683
 684	if (xfs_is_readonly(mp))
 685		return -EROFS;
 686
 687	if (xfs_is_shutdown(mp))
 688		return -EIO;
 689
 690	return setattr_prepare(idmap, dentry, iattr);
 691}
 692
 693/*
 694 * Set non-size attributes of an inode.
 695 *
 696 * Caution: The caller of this function is responsible for calling
 697 * setattr_prepare() or otherwise verifying the change is fine.
 698 */
 699static int
 700xfs_setattr_nonsize(
 701	struct mnt_idmap	*idmap,
 702	struct dentry		*dentry,
 703	struct xfs_inode	*ip,
 704	struct iattr		*iattr)
 
 705{
 706	xfs_mount_t		*mp = ip->i_mount;
 707	struct inode		*inode = VFS_I(ip);
 708	int			mask = iattr->ia_valid;
 709	xfs_trans_t		*tp;
 710	int			error;
 711	kuid_t			uid = GLOBAL_ROOT_UID;
 712	kgid_t			gid = GLOBAL_ROOT_GID;
 713	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
 714	struct xfs_dquot	*old_udqp = NULL, *old_gdqp = NULL;
 715
 716	ASSERT((mask & ATTR_SIZE) == 0);
 717
 718	/*
 719	 * If disk quotas is on, we make sure that the dquots do exist on disk,
 720	 * before we start any other transactions. Trying to do this later
 721	 * is messy. We don't care to take a readlock to look at the ids
 722	 * in inode here, because we can't hold it across the trans_reserve.
 723	 * If the IDs do change before we take the ilock, we're covered
 724	 * because the i_*dquot fields will get updated anyway.
 725	 */
 726	if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
 727		uint	qflags = 0;
 728
 729		if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
 730			uid = from_vfsuid(idmap, i_user_ns(inode),
 731					  iattr->ia_vfsuid);
 732			qflags |= XFS_QMOPT_UQUOTA;
 733		} else {
 734			uid = inode->i_uid;
 735		}
 736		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
 737			gid = from_vfsgid(idmap, i_user_ns(inode),
 738					  iattr->ia_vfsgid);
 739			qflags |= XFS_QMOPT_GQUOTA;
 740		}  else {
 741			gid = inode->i_gid;
 742		}
 743
 744		/*
 745		 * We take a reference when we initialize udqp and gdqp,
 746		 * so it is important that we never blindly double trip on
 747		 * the same variable. See xfs_create() for an example.
 748		 */
 749		ASSERT(udqp == NULL);
 750		ASSERT(gdqp == NULL);
 751		error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid,
 
 
 752					   qflags, &udqp, &gdqp, NULL);
 753		if (error)
 754			return error;
 755	}
 756
 757	error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
 758			has_capability_noaudit(current, CAP_FOWNER), &tp);
 759	if (error)
 760		goto out_dqrele;
 761
 
 
 
 762	/*
 763	 * Register quota modifications in the transaction.  Must be the owner
 764	 * or privileged.  These IDs could have changed since we last looked at
 765	 * them.  But, we're assured that if the ownership did change while we
 766	 * didn't have the inode locked, inode's dquot(s) would have changed
 767	 * also.
 768	 */
 769	if (XFS_IS_UQUOTA_ON(mp) &&
 770	    i_uid_needs_update(idmap, iattr, inode)) {
 771		ASSERT(udqp);
 772		old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp);
 773	}
 774	if (XFS_IS_GQUOTA_ON(mp) &&
 775	    i_gid_needs_update(idmap, iattr, inode)) {
 776		ASSERT(xfs_has_pquotino(mp) || !XFS_IS_PQUOTA_ON(mp));
 777		ASSERT(gdqp);
 778		old_gdqp = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp);
 
 
 
 
 
 
 
 
 
 
 
 
 779	}
 780
 781	setattr_copy(idmap, inode, iattr);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 782	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 783
 784	XFS_STATS_INC(mp, xs_ig_attrchg);
 785
 786	if (xfs_has_wsync(mp))
 787		xfs_trans_set_sync(tp);
 788	error = xfs_trans_commit(tp);
 789
 
 
 790	/*
 791	 * Release any dquot(s) the inode had kept before chown.
 792	 */
 793	xfs_qm_dqrele(old_udqp);
 794	xfs_qm_dqrele(old_gdqp);
 795	xfs_qm_dqrele(udqp);
 796	xfs_qm_dqrele(gdqp);
 797
 798	if (error)
 799		return error;
 800
 801	/*
 802	 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
 803	 * 	     update.  We could avoid this with linked transactions
 804	 * 	     and passing down the transaction pointer all the way
 805	 *	     to attr_set.  No previous user of the generic
 806	 * 	     Posix ACL code seems to care about this issue either.
 807	 */
 808	if (mask & ATTR_MODE) {
 809		error = posix_acl_chmod(idmap, dentry, inode->i_mode);
 810		if (error)
 811			return error;
 812	}
 813
 814	return 0;
 815
 
 
 
 816out_dqrele:
 817	xfs_qm_dqrele(udqp);
 818	xfs_qm_dqrele(gdqp);
 819	return error;
 820}
 821
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 822/*
 823 * Truncate file.  Must have write permission and not be a directory.
 824 *
 825 * Caution: The caller of this function is responsible for calling
 826 * setattr_prepare() or otherwise verifying the change is fine.
 827 */
 828STATIC int
 829xfs_setattr_size(
 830	struct mnt_idmap	*idmap,
 831	struct dentry		*dentry,
 832	struct xfs_inode	*ip,
 833	struct iattr		*iattr)
 834{
 835	struct xfs_mount	*mp = ip->i_mount;
 836	struct inode		*inode = VFS_I(ip);
 837	xfs_off_t		oldsize, newsize;
 838	struct xfs_trans	*tp;
 839	int			error;
 840	uint			lock_flags = 0;
 841	uint			resblks = 0;
 842	bool			did_zeroing = false;
 843
 844	xfs_assert_ilocked(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL);
 
 845	ASSERT(S_ISREG(inode->i_mode));
 846	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
 847		ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
 848
 849	oldsize = inode->i_size;
 850	newsize = iattr->ia_size;
 851
 852	/*
 853	 * Short circuit the truncate case for zero length files.
 854	 */
 855	if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
 856		if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
 857			return 0;
 858
 859		/*
 860		 * Use the regular setattr path to update the timestamps.
 861		 */
 862		iattr->ia_valid &= ~ATTR_SIZE;
 863		return xfs_setattr_nonsize(idmap, dentry, ip, iattr);
 864	}
 865
 866	/*
 867	 * Make sure that the dquots are attached to the inode.
 868	 */
 869	error = xfs_qm_dqattach(ip);
 870	if (error)
 871		return error;
 872
 873	/*
 874	 * Wait for all direct I/O to complete.
 875	 */
 876	inode_dio_wait(inode);
 877
 878	/*
 879	 * File data changes must be complete before we start the transaction to
 880	 * modify the inode.  This needs to be done before joining the inode to
 881	 * the transaction because the inode cannot be unlocked once it is a
 882	 * part of the transaction.
 883	 *
 884	 * Start with zeroing any data beyond EOF that we may expose on file
 885	 * extension, or zeroing out the rest of the block on a downward
 886	 * truncate.
 887	 */
 888	if (newsize > oldsize) {
 889		trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
 890		error = xfs_zero_range(ip, oldsize, newsize - oldsize,
 891				&did_zeroing);
 892	} else {
 893		error = xfs_truncate_page(ip, newsize, &did_zeroing);
 
 894	}
 895
 896	if (error)
 897		return error;
 898
 899	/*
 900	 * We've already locked out new page faults, so now we can safely remove
 901	 * pages from the page cache knowing they won't get refaulted until we
 902	 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
 903	 * complete. The truncate_setsize() call also cleans partial EOF page
 904	 * PTEs on extending truncates and hence ensures sub-page block size
 905	 * filesystems are correctly handled, too.
 906	 *
 907	 * We have to do all the page cache truncate work outside the
 908	 * transaction context as the "lock" order is page lock->log space
 909	 * reservation as defined by extent allocation in the writeback path.
 910	 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
 911	 * having already truncated the in-memory version of the file (i.e. made
 912	 * user visible changes). There's not much we can do about this, except
 913	 * to hope that the caller sees ENOMEM and retries the truncate
 914	 * operation.
 915	 *
 916	 * And we update in-core i_size and truncate page cache beyond newsize
 917	 * before writeback the [i_disk_size, newsize] range, so we're
 918	 * guaranteed not to write stale data past the new EOF on truncate down.
 919	 */
 920	truncate_setsize(inode, newsize);
 921
 922	/*
 923	 * We are going to log the inode size change in this transaction so
 924	 * any previous writes that are beyond the on disk EOF and the new
 925	 * EOF that have not been written out need to be written here.  If we
 926	 * do not write the data out, we expose ourselves to the null files
 927	 * problem. Note that this includes any block zeroing we did above;
 928	 * otherwise those blocks may not be zeroed after a crash.
 929	 */
 930	if (did_zeroing ||
 931	    (newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) {
 932		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
 933						ip->i_disk_size, newsize - 1);
 934		if (error)
 935			return error;
 936	}
 937
 938	/*
 939	 * For realtime inode with more than one block rtextsize, we need the
 940	 * block reservation for bmap btree block allocations/splits that can
 941	 * happen since it could split the tail written extent and convert the
 942	 * right beyond EOF one to unwritten.
 943	 */
 944	if (xfs_inode_has_bigrtalloc(ip))
 945		resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
 946
 947	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, resblks,
 948				0, 0, &tp);
 949	if (error)
 950		return error;
 951
 952	lock_flags |= XFS_ILOCK_EXCL;
 953	xfs_ilock(ip, XFS_ILOCK_EXCL);
 954	xfs_trans_ijoin(tp, ip, 0);
 955
 956	/*
 957	 * Only change the c/mtime if we are changing the size or we are
 958	 * explicitly asked to change it.  This handles the semantic difference
 959	 * between truncate() and ftruncate() as implemented in the VFS.
 960	 *
 961	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
 962	 * special case where we need to update the times despite not having
 963	 * these flags set.  For all other operations the VFS set these flags
 964	 * explicitly if it wants a timestamp update.
 965	 */
 966	if (newsize != oldsize &&
 967	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
 968		iattr->ia_ctime = iattr->ia_mtime =
 969			current_time(inode);
 970		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 971	}
 972
 973	/*
 974	 * The first thing we do is set the size to new_size permanently on
 975	 * disk.  This way we don't have to worry about anyone ever being able
 976	 * to look at the data being freed even in the face of a crash.
 977	 * What we're getting around here is the case where we free a block, it
 978	 * is allocated to another file, it is written to, and then we crash.
 979	 * If the new data gets written to the file but the log buffers
 980	 * containing the free and reallocation don't, then we'd end up with
 981	 * garbage in the blocks being freed.  As long as we make the new size
 982	 * permanent before actually freeing any blocks it doesn't matter if
 983	 * they get written to.
 984	 */
 985	ip->i_disk_size = newsize;
 986	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 987
 988	if (newsize <= oldsize) {
 989		error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
 990		if (error)
 991			goto out_trans_cancel;
 992
 993		/*
 994		 * Truncated "down", so we're removing references to old data
 995		 * here - if we delay flushing for a long time, we expose
 996		 * ourselves unduly to the notorious NULL files problem.  So,
 997		 * we mark this inode and flush it when the file is closed,
 998		 * and do not wait the usual (long) time for writeout.
 999		 */
1000		xfs_iflags_set(ip, XFS_ITRUNCATED);
1001
1002		/* A truncate down always removes post-EOF blocks. */
1003		xfs_inode_clear_eofblocks_tag(ip);
1004	}
1005
1006	ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
1007	setattr_copy(idmap, inode, iattr);
 
 
 
1008	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1009
1010	XFS_STATS_INC(mp, xs_ig_attrchg);
1011
1012	if (xfs_has_wsync(mp))
1013		xfs_trans_set_sync(tp);
1014
1015	error = xfs_trans_commit(tp);
1016out_unlock:
1017	if (lock_flags)
1018		xfs_iunlock(ip, lock_flags);
1019	return error;
1020
1021out_trans_cancel:
1022	xfs_trans_cancel(tp);
1023	goto out_unlock;
1024}
1025
1026int
1027xfs_vn_setattr_size(
1028	struct mnt_idmap	*idmap,
1029	struct dentry		*dentry,
1030	struct iattr		*iattr)
1031{
1032	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
1033	int error;
1034
1035	trace_xfs_setattr(ip);
1036
1037	error = xfs_vn_change_ok(idmap, dentry, iattr);
1038	if (error)
1039		return error;
1040	return xfs_setattr_size(idmap, dentry, ip, iattr);
1041}
1042
1043STATIC int
1044xfs_vn_setattr(
1045	struct mnt_idmap	*idmap,
1046	struct dentry		*dentry,
1047	struct iattr		*iattr)
1048{
1049	struct inode		*inode = d_inode(dentry);
1050	struct xfs_inode	*ip = XFS_I(inode);
1051	int			error;
1052
1053	if (iattr->ia_valid & ATTR_SIZE) {
 
 
1054		uint			iolock;
1055
1056		xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1057		iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1058
1059		error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1060		if (error) {
1061			xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1062			return error;
1063		}
1064
1065		error = xfs_vn_setattr_size(idmap, dentry, iattr);
1066		xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1067	} else {
1068		trace_xfs_setattr(ip);
1069
1070		error = xfs_vn_change_ok(idmap, dentry, iattr);
1071		if (!error)
1072			error = xfs_setattr_nonsize(idmap, dentry, ip, iattr);
1073	}
1074
1075	return error;
1076}
1077
1078STATIC int
1079xfs_vn_update_time(
1080	struct inode		*inode,
 
1081	int			flags)
1082{
1083	struct xfs_inode	*ip = XFS_I(inode);
1084	struct xfs_mount	*mp = ip->i_mount;
1085	int			log_flags = XFS_ILOG_TIMESTAMP;
1086	struct xfs_trans	*tp;
1087	int			error;
1088	struct timespec64	now;
1089
1090	trace_xfs_update_time(ip);
1091
1092	if (inode->i_sb->s_flags & SB_LAZYTIME) {
1093		if (!((flags & S_VERSION) &&
1094		      inode_maybe_inc_iversion(inode, false))) {
1095			generic_update_time(inode, flags);
1096			return 0;
1097		}
1098
1099		/* Capture the iversion update that just occurred */
1100		log_flags |= XFS_ILOG_CORE;
1101	}
1102
1103	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1104	if (error)
1105		return error;
1106
1107	xfs_ilock(ip, XFS_ILOCK_EXCL);
1108	if (flags & (S_CTIME|S_MTIME))
1109		now = inode_set_ctime_current(inode);
1110	else
1111		now = current_time(inode);
1112
1113	if (flags & S_MTIME)
1114		inode_set_mtime_to_ts(inode, now);
1115	if (flags & S_ATIME)
1116		inode_set_atime_to_ts(inode, now);
1117
1118	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1119	xfs_trans_log_inode(tp, ip, log_flags);
1120	return xfs_trans_commit(tp);
1121}
1122
1123STATIC int
1124xfs_vn_fiemap(
1125	struct inode		*inode,
1126	struct fiemap_extent_info *fieinfo,
1127	u64			start,
1128	u64			length)
1129{
1130	int			error;
1131
1132	xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1133	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1134		fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1135		error = iomap_fiemap(inode, fieinfo, start, length,
1136				&xfs_xattr_iomap_ops);
1137	} else {
1138		error = iomap_fiemap(inode, fieinfo, start, length,
1139				&xfs_read_iomap_ops);
1140	}
1141	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1142
1143	return error;
1144}
1145
1146STATIC int
1147xfs_vn_tmpfile(
1148	struct mnt_idmap	*idmap,
1149	struct inode		*dir,
1150	struct file		*file,
1151	umode_t			mode)
1152{
1153	int err = xfs_generic_create(idmap, dir, file->f_path.dentry, mode, 0, file);
1154
1155	return finish_open_simple(file, err);
1156}
1157
1158static const struct inode_operations xfs_inode_operations = {
1159	.get_inode_acl		= xfs_get_acl,
1160	.set_acl		= xfs_set_acl,
1161	.getattr		= xfs_vn_getattr,
1162	.setattr		= xfs_vn_setattr,
1163	.listxattr		= xfs_vn_listxattr,
1164	.fiemap			= xfs_vn_fiemap,
1165	.update_time		= xfs_vn_update_time,
1166	.fileattr_get		= xfs_fileattr_get,
1167	.fileattr_set		= xfs_fileattr_set,
1168};
1169
1170static const struct inode_operations xfs_dir_inode_operations = {
1171	.create			= xfs_vn_create,
1172	.lookup			= xfs_vn_lookup,
1173	.link			= xfs_vn_link,
1174	.unlink			= xfs_vn_unlink,
1175	.symlink		= xfs_vn_symlink,
1176	.mkdir			= xfs_vn_mkdir,
1177	/*
1178	 * Yes, XFS uses the same method for rmdir and unlink.
1179	 *
1180	 * There are some subtile differences deeper in the code,
1181	 * but we use S_ISDIR to check for those.
1182	 */
1183	.rmdir			= xfs_vn_unlink,
1184	.mknod			= xfs_vn_mknod,
1185	.rename			= xfs_vn_rename,
1186	.get_inode_acl		= xfs_get_acl,
1187	.set_acl		= xfs_set_acl,
1188	.getattr		= xfs_vn_getattr,
1189	.setattr		= xfs_vn_setattr,
1190	.listxattr		= xfs_vn_listxattr,
1191	.update_time		= xfs_vn_update_time,
1192	.tmpfile		= xfs_vn_tmpfile,
1193	.fileattr_get		= xfs_fileattr_get,
1194	.fileattr_set		= xfs_fileattr_set,
1195};
1196
1197static const struct inode_operations xfs_dir_ci_inode_operations = {
1198	.create			= xfs_vn_create,
1199	.lookup			= xfs_vn_ci_lookup,
1200	.link			= xfs_vn_link,
1201	.unlink			= xfs_vn_unlink,
1202	.symlink		= xfs_vn_symlink,
1203	.mkdir			= xfs_vn_mkdir,
1204	/*
1205	 * Yes, XFS uses the same method for rmdir and unlink.
1206	 *
1207	 * There are some subtile differences deeper in the code,
1208	 * but we use S_ISDIR to check for those.
1209	 */
1210	.rmdir			= xfs_vn_unlink,
1211	.mknod			= xfs_vn_mknod,
1212	.rename			= xfs_vn_rename,
1213	.get_inode_acl		= xfs_get_acl,
1214	.set_acl		= xfs_set_acl,
1215	.getattr		= xfs_vn_getattr,
1216	.setattr		= xfs_vn_setattr,
1217	.listxattr		= xfs_vn_listxattr,
1218	.update_time		= xfs_vn_update_time,
1219	.tmpfile		= xfs_vn_tmpfile,
1220	.fileattr_get		= xfs_fileattr_get,
1221	.fileattr_set		= xfs_fileattr_set,
1222};
1223
1224static const struct inode_operations xfs_symlink_inode_operations = {
1225	.get_link		= xfs_vn_get_link,
1226	.getattr		= xfs_vn_getattr,
1227	.setattr		= xfs_vn_setattr,
1228	.listxattr		= xfs_vn_listxattr,
1229	.update_time		= xfs_vn_update_time,
1230};
1231
 
 
 
 
 
 
 
 
1232/* Figure out if this file actually supports DAX. */
1233static bool
1234xfs_inode_supports_dax(
1235	struct xfs_inode	*ip)
1236{
1237	struct xfs_mount	*mp = ip->i_mount;
1238
1239	/* Only supported on regular files. */
1240	if (!S_ISREG(VFS_I(ip)->i_mode))
 
 
 
 
 
1241		return false;
1242
1243	/* Block size must match page size */
1244	if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1245		return false;
1246
1247	/* Device has to support DAX too. */
1248	return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1249}
1250
1251static bool
1252xfs_inode_should_enable_dax(
1253	struct xfs_inode *ip)
1254{
1255	if (!IS_ENABLED(CONFIG_FS_DAX))
1256		return false;
1257	if (xfs_has_dax_never(ip->i_mount))
1258		return false;
1259	if (!xfs_inode_supports_dax(ip))
1260		return false;
1261	if (xfs_has_dax_always(ip->i_mount))
1262		return true;
1263	if (ip->i_diflags2 & XFS_DIFLAG2_DAX)
1264		return true;
1265	return false;
1266}
1267
1268void
1269xfs_diflags_to_iflags(
1270	struct xfs_inode	*ip,
1271	bool init)
1272{
1273	struct inode            *inode = VFS_I(ip);
1274	unsigned int            xflags = xfs_ip2xflags(ip);
1275	unsigned int            flags = 0;
1276
1277	ASSERT(!(IS_DAX(inode) && init));
1278
1279	if (xflags & FS_XFLAG_IMMUTABLE)
1280		flags |= S_IMMUTABLE;
1281	if (xflags & FS_XFLAG_APPEND)
1282		flags |= S_APPEND;
1283	if (xflags & FS_XFLAG_SYNC)
1284		flags |= S_SYNC;
1285	if (xflags & FS_XFLAG_NOATIME)
1286		flags |= S_NOATIME;
1287	if (init && xfs_inode_should_enable_dax(ip))
1288		flags |= S_DAX;
1289
1290	/*
1291	 * S_DAX can only be set during inode initialization and is never set by
1292	 * the VFS, so we cannot mask off S_DAX in i_flags.
1293	 */
1294	inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1295	inode->i_flags |= flags;
 
 
 
 
 
 
 
1296}
1297
1298/*
1299 * Initialize the Linux inode.
1300 *
1301 * When reading existing inodes from disk this is called directly from xfs_iget,
1302 * when creating a new inode it is called from xfs_init_new_inode after setting
1303 * up the inode. These callers have different criteria for clearing XFS_INEW, so
1304 * leave it up to the caller to deal with unlocking the inode appropriately.
1305 */
1306void
1307xfs_setup_inode(
1308	struct xfs_inode	*ip)
1309{
1310	struct inode		*inode = &ip->i_vnode;
1311	gfp_t			gfp_mask;
1312	bool			is_meta = xfs_is_internal_inode(ip);
1313
1314	inode->i_ino = ip->i_ino;
1315	inode->i_state |= I_NEW;
1316
1317	inode_sb_list_add(inode);
1318	/* make the inode look hashed for the writeback code */
1319	inode_fake_hash(inode);
1320
1321	i_size_write(inode, ip->i_disk_size);
1322	xfs_diflags_to_iflags(ip, true);
1323
1324	/*
1325	 * Mark our metadata files as private so that LSMs and the ACL code
1326	 * don't try to add their own metadata or reason about these files,
1327	 * and users cannot ever obtain file handles to them.
1328	 */
1329	if (is_meta) {
1330		inode->i_flags |= S_PRIVATE;
1331		inode->i_opflags &= ~IOP_XATTR;
1332	}
1333
1334	if (S_ISDIR(inode->i_mode)) {
1335		/*
1336		 * We set the i_rwsem class here to avoid potential races with
1337		 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1338		 * after a filehandle lookup has already found the inode in
1339		 * cache before it has been unlocked via unlock_new_inode().
1340		 */
1341		lockdep_set_class(&inode->i_rwsem,
1342				  &inode->i_sb->s_type->i_mutex_dir_key);
1343		lockdep_set_class(&ip->i_lock, &xfs_dir_ilock_class);
 
1344	} else {
1345		lockdep_set_class(&ip->i_lock, &xfs_nondir_ilock_class);
 
1346	}
1347
1348	/*
1349	 * Ensure all page cache allocations are done from GFP_NOFS context to
1350	 * prevent direct reclaim recursion back into the filesystem and blowing
1351	 * stacks or deadlocking.
1352	 */
1353	gfp_mask = mapping_gfp_mask(inode->i_mapping);
1354	mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1355
1356	/*
1357	 * For real-time inodes update the stable write flags to that of the RT
1358	 * device instead of the data device.
1359	 */
1360	if (S_ISREG(inode->i_mode) && XFS_IS_REALTIME_INODE(ip))
1361		xfs_update_stable_writes(ip);
1362
1363	/*
1364	 * If there is no attribute fork no ACL can exist on this inode,
1365	 * and it can't have any file capabilities attached to it either.
1366	 */
1367	if (!xfs_inode_has_attr_fork(ip)) {
1368		inode_has_no_xattr(inode);
1369		cache_no_acl(inode);
1370	}
1371}
1372
1373void
1374xfs_setup_iops(
1375	struct xfs_inode	*ip)
1376{
1377	struct inode		*inode = &ip->i_vnode;
1378
1379	switch (inode->i_mode & S_IFMT) {
1380	case S_IFREG:
1381		inode->i_op = &xfs_inode_operations;
1382		inode->i_fop = &xfs_file_operations;
1383		if (IS_DAX(inode))
1384			inode->i_mapping->a_ops = &xfs_dax_aops;
1385		else
1386			inode->i_mapping->a_ops = &xfs_address_space_operations;
1387		break;
1388	case S_IFDIR:
1389		if (xfs_has_asciici(XFS_M(inode->i_sb)))
1390			inode->i_op = &xfs_dir_ci_inode_operations;
1391		else
1392			inode->i_op = &xfs_dir_inode_operations;
1393		inode->i_fop = &xfs_dir_file_operations;
1394		break;
1395	case S_IFLNK:
1396		inode->i_op = &xfs_symlink_inode_operations;
 
 
 
1397		break;
1398	default:
1399		inode->i_op = &xfs_inode_operations;
1400		init_special_inode(inode, inode->i_mode, inode->i_rdev);
1401		break;
1402	}
1403}