xfs_iops.c 31.4 KB
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/*
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 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
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 *
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 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation.
 *
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 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
#include "xfs.h"
#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_inode.h"
#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_acl.h"
#include "xfs_quota.h"
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#include "xfs_error.h"
#include "xfs_attr.h"
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#include "xfs_trans.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_symlink.h"
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#include "xfs_da_btree.h"
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#include "xfs_dir2.h"
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#include "xfs_trans_space.h"
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#include "xfs_pnfs.h"
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#include "xfs_iomap.h"
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#include <linux/capability.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/security.h>
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#include <linux/iomap.h>
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#include <linux/slab.h>
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/*
 * Directories have different lock order w.r.t. mmap_sem compared to regular
 * files. This is due to readdir potentially triggering page faults on a user
 * buffer inside filldir(), and this happens with the ilock on the directory
 * held. For regular files, the lock order is the other way around - the
 * mmap_sem is taken during the page fault, and then we lock the ilock to do
 * block mapping. Hence we need a different class for the directory ilock so
 * that lockdep can tell them apart.
 */
static struct lock_class_key xfs_nondir_ilock_class;
static struct lock_class_key xfs_dir_ilock_class;

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static int
xfs_initxattrs(
	struct inode		*inode,
	const struct xattr	*xattr_array,
	void			*fs_info)
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{
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	const struct xattr	*xattr;
	struct xfs_inode	*ip = XFS_I(inode);
	int			error = 0;
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	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
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		error = xfs_attr_set(ip, xattr->name, xattr->value,
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				      xattr->value_len, ATTR_SECURE);
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		if (error < 0)
			break;
	}
	return error;
}

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/*
 * Hook in SELinux.  This is not quite correct yet, what we really need
 * here (as we do for default ACLs) is a mechanism by which creation of
 * these attrs can be journalled at inode creation time (along with the
 * inode, of course, such that log replay can't cause these to be lost).
 */
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STATIC int
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xfs_init_security(
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	struct inode	*inode,
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	struct inode	*dir,
	const struct qstr *qstr)
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{
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	return security_inode_init_security(inode, dir, qstr,
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					     &xfs_initxattrs, NULL);
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}

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static void
xfs_dentry_to_name(
	struct xfs_name	*namep,
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	struct dentry	*dentry,
	int		mode)
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{
	namep->name = dentry->d_name.name;
	namep->len = dentry->d_name.len;
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	namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT];
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}

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STATIC void
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xfs_cleanup_inode(
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	struct inode	*dir,
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	struct inode	*inode,
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	struct dentry	*dentry)
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{
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	struct xfs_name	teardown;
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	/* Oh, the horror.
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	 * If we can't add the ACL or we fail in
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	 * xfs_init_security we must back out.
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	 * ENOSPC can hit here, among other things.
	 */
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	xfs_dentry_to_name(&teardown, dentry, 0);
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	xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
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}

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STATIC int
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xfs_generic_create(
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	struct inode	*dir,
	struct dentry	*dentry,
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	umode_t		mode,
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	dev_t		rdev,
	bool		tmpfile)	/* unnamed file */
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{
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	struct inode	*inode;
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	struct xfs_inode *ip = NULL;
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	struct posix_acl *default_acl, *acl;
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	struct xfs_name	name;
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	int		error;

	/*
	 * Irix uses Missed'em'V split, but doesn't want to see
	 * the upper 5 bits of (14bit) major.
	 */
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	if (S_ISCHR(mode) || S_ISBLK(mode)) {
		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
			return -EINVAL;
		rdev = sysv_encode_dev(rdev);
	} else {
		rdev = 0;
	}
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	error = posix_acl_create(dir, &mode, &default_acl, &acl);
	if (error)
		return error;
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	if (!tmpfile) {
		xfs_dentry_to_name(&name, dentry, mode);
		error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
	} else {
		error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
	}
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	if (unlikely(error))
		goto out_free_acl;
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	inode = VFS_I(ip);
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	error = xfs_init_security(inode, dir, &dentry->d_name);
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	if (unlikely(error))
		goto out_cleanup_inode;

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#ifdef CONFIG_XFS_POSIX_ACL
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	if (default_acl) {
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		error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
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		if (error)
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			goto out_cleanup_inode;
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	}
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	if (acl) {
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		error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
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		if (error)
			goto out_cleanup_inode;
	}
#endif
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	xfs_setup_iops(ip);

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	if (tmpfile)
		d_tmpfile(dentry, inode);
	else
		d_instantiate(dentry, inode);

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	xfs_finish_inode_setup(ip);

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 out_free_acl:
	if (default_acl)
		posix_acl_release(default_acl);
	if (acl)
		posix_acl_release(acl);
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	return error;
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 out_cleanup_inode:
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	xfs_finish_inode_setup(ip);
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	if (!tmpfile)
		xfs_cleanup_inode(dir, inode, dentry);
	iput(inode);
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	goto out_free_acl;
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}

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STATIC int
xfs_vn_mknod(
	struct inode	*dir,
	struct dentry	*dentry,
	umode_t		mode,
	dev_t		rdev)
{
	return xfs_generic_create(dir, dentry, mode, rdev, false);
}

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STATIC int
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xfs_vn_create(
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	struct inode	*dir,
	struct dentry	*dentry,
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	umode_t		mode,
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	bool		flags)
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{
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	return xfs_vn_mknod(dir, dentry, mode, 0);
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}

STATIC int
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xfs_vn_mkdir(
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	struct inode	*dir,
	struct dentry	*dentry,
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	umode_t		mode)
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{
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	return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
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}

STATIC struct dentry *
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xfs_vn_lookup(
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	struct inode	*dir,
	struct dentry	*dentry,
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	unsigned int flags)
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{
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	struct xfs_inode *cip;
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	struct xfs_name	name;
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	int		error;

	if (dentry->d_name.len >= MAXNAMELEN)
		return ERR_PTR(-ENAMETOOLONG);

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	xfs_dentry_to_name(&name, dentry, 0);
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	error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
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	if (unlikely(error)) {
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		if (unlikely(error != -ENOENT))
			return ERR_PTR(error);
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		d_add(dentry, NULL);
		return NULL;
	}

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	return d_splice_alias(VFS_I(cip), dentry);
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}

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STATIC struct dentry *
xfs_vn_ci_lookup(
	struct inode	*dir,
	struct dentry	*dentry,
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	unsigned int flags)
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{
	struct xfs_inode *ip;
	struct xfs_name	xname;
	struct xfs_name ci_name;
	struct qstr	dname;
	int		error;

	if (dentry->d_name.len >= MAXNAMELEN)
		return ERR_PTR(-ENAMETOOLONG);

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	xfs_dentry_to_name(&xname, dentry, 0);
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	error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
	if (unlikely(error)) {
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		if (unlikely(error != -ENOENT))
			return ERR_PTR(error);
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		/*
		 * call d_add(dentry, NULL) here when d_drop_negative_children
		 * is called in xfs_vn_mknod (ie. allow negative dentries
		 * with CI filesystems).
		 */
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		return NULL;
	}

	/* if exact match, just splice and exit */
	if (!ci_name.name)
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		return d_splice_alias(VFS_I(ip), dentry);
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	/* else case-insensitive match... */
	dname.name = ci_name.name;
	dname.len = ci_name.len;
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	dentry = d_add_ci(dentry, VFS_I(ip), &dname);
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	kmem_free(ci_name.name);
	return dentry;
}

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STATIC int
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xfs_vn_link(
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	struct dentry	*old_dentry,
	struct inode	*dir,
	struct dentry	*dentry)
{
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	struct inode	*inode = d_inode(old_dentry);
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	struct xfs_name	name;
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	int		error;

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	xfs_dentry_to_name(&name, dentry, inode->i_mode);
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	error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
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	if (unlikely(error))
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		return error;
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	ihold(inode);
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	d_instantiate(dentry, inode);
	return 0;
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}

STATIC int
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xfs_vn_unlink(
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	struct inode	*dir,
	struct dentry	*dentry)
{
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	struct xfs_name	name;
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	int		error;

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	xfs_dentry_to_name(&name, dentry, 0);
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	error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
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	if (error)
		return error;

	/*
	 * With unlink, the VFS makes the dentry "negative": no inode,
	 * but still hashed. This is incompatible with case-insensitive
	 * mode, so invalidate (unhash) the dentry in CI-mode.
	 */
	if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
		d_invalidate(dentry);
	return 0;
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}

STATIC int
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xfs_vn_symlink(
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	struct inode	*dir,
	struct dentry	*dentry,
	const char	*symname)
{
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	struct inode	*inode;
	struct xfs_inode *cip = NULL;
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	struct xfs_name	name;
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	int		error;
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	umode_t		mode;
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	mode = S_IFLNK |
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		(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
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	xfs_dentry_to_name(&name, dentry, mode);
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	error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
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	if (unlikely(error))
		goto out;

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	inode = VFS_I(cip);
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	error = xfs_init_security(inode, dir, &dentry->d_name);
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	if (unlikely(error))
		goto out_cleanup_inode;

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	xfs_setup_iops(cip);

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	d_instantiate(dentry, inode);
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	xfs_finish_inode_setup(cip);
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	return 0;

 out_cleanup_inode:
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	xfs_finish_inode_setup(cip);
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	xfs_cleanup_inode(dir, inode, dentry);
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	iput(inode);
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 out:
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	return error;
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}

STATIC int
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xfs_vn_rename(
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	struct inode	*odir,
	struct dentry	*odentry,
	struct inode	*ndir,
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	struct dentry	*ndentry,
	unsigned int	flags)
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{
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	struct inode	*new_inode = d_inode(ndentry);
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	int		omode = 0;
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	struct xfs_name	oname;
	struct xfs_name	nname;
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	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
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		return -EINVAL;

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	/* if we are exchanging files, we need to set i_mode of both files */
	if (flags & RENAME_EXCHANGE)
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		omode = d_inode(ndentry)->i_mode;
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	xfs_dentry_to_name(&oname, odentry, omode);
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	xfs_dentry_to_name(&nname, ndentry, d_inode(odentry)->i_mode);
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	return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
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			  XFS_I(ndir), &nname,
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			  new_inode ? XFS_I(new_inode) : NULL, flags);
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}

/*
 * careful here - this function can get called recursively, so
 * we need to be very careful about how much stack we use.
 * uio is kmalloced for this reason...
 */
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STATIC const char *
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xfs_vn_get_link(
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	struct dentry		*dentry,
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	struct inode		*inode,
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	struct delayed_call	*done)
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{
	char			*link;
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	int			error = -ENOMEM;
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	if (!dentry)
		return ERR_PTR(-ECHILD);

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	link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
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	if (!link)
		goto out_err;
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	error = xfs_readlink(XFS_I(d_inode(dentry)), link);
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	if (unlikely(error))
		goto out_kfree;
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	set_delayed_call(done, kfree_link, link);
	return link;
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 out_kfree:
	kfree(link);
 out_err:
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	return ERR_PTR(error);
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}

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STATIC const char *
xfs_vn_get_link_inline(
	struct dentry		*dentry,
	struct inode		*inode,
	struct delayed_call	*done)
{
	ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
	return XFS_I(inode)->i_df.if_u1.if_data;
}

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STATIC int
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xfs_vn_getattr(
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	struct vfsmount		*mnt,
	struct dentry		*dentry,
	struct kstat		*stat)
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{
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	struct inode		*inode = d_inode(dentry);
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	struct xfs_inode	*ip = XFS_I(inode);
	struct xfs_mount	*mp = ip->i_mount;

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	trace_xfs_getattr(ip);
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	if (XFS_FORCED_SHUTDOWN(mp))
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		return -EIO;
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	stat->size = XFS_ISIZE(ip);
	stat->dev = inode->i_sb->s_dev;
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	stat->mode = inode->i_mode;
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	stat->nlink = inode->i_nlink;
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	stat->uid = inode->i_uid;
	stat->gid = inode->i_gid;
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	stat->ino = ip->i_ino;
	stat->atime = inode->i_atime;
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	stat->mtime = inode->i_mtime;
	stat->ctime = inode->i_ctime;
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	stat->blocks =
		XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);


	switch (inode->i_mode & S_IFMT) {
	case S_IFBLK:
	case S_IFCHR:
		stat->blksize = BLKDEV_IOSIZE;
		stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
				   sysv_minor(ip->i_df.if_u2.if_rdev));
		break;
	default:
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		if (XFS_IS_REALTIME_INODE(ip)) {
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			/*
			 * If the file blocks are being allocated from a
			 * realtime volume, then return the inode's realtime
			 * extent size or the realtime volume's extent size.
			 */
			stat->blksize =
				xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
		} else
			stat->blksize = xfs_preferred_iosize(mp);
		stat->rdev = 0;
		break;
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	}
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	return 0;
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}

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static void
xfs_setattr_mode(
	struct xfs_inode	*ip,
	struct iattr		*iattr)
{
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	struct inode		*inode = VFS_I(ip);
	umode_t			mode = iattr->ia_mode;
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	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

	inode->i_mode &= S_IFMT;
	inode->i_mode |= mode & ~S_IFMT;
}

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void
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xfs_setattr_time(
	struct xfs_inode	*ip,
	struct iattr		*iattr)
{
	struct inode		*inode = VFS_I(ip);

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

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	if (iattr->ia_valid & ATTR_ATIME)
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		inode->i_atime = iattr->ia_atime;
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	if (iattr->ia_valid & ATTR_CTIME)
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		inode->i_ctime = iattr->ia_ctime;
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	if (iattr->ia_valid & ATTR_MTIME)
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		inode->i_mtime = iattr->ia_mtime;
}

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static int
xfs_vn_change_ok(
	struct dentry	*dentry,
	struct iattr	*iattr)
{
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	struct xfs_mount	*mp = XFS_I(d_inode(dentry))->i_mount;
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	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return -EROFS;

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

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	return setattr_prepare(dentry, iattr);
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}

/*
 * Set non-size attributes of an inode.
 *
 * Caution: The caller of this function is responsible for calling
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 * setattr_prepare() or otherwise verifying the change is fine.
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 */
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int
xfs_setattr_nonsize(
	struct xfs_inode	*ip,
	struct iattr		*iattr,
	int			flags)
{
	xfs_mount_t		*mp = ip->i_mount;
	struct inode		*inode = VFS_I(ip);
	int			mask = iattr->ia_valid;
	xfs_trans_t		*tp;
	int			error;
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	kuid_t			uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
	kgid_t			gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
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	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
	struct xfs_dquot	*olddquot1 = NULL, *olddquot2 = NULL;

	ASSERT((mask & ATTR_SIZE) == 0);

	/*
	 * If disk quotas is on, we make sure that the dquots do exist on disk,
	 * before we start any other transactions. Trying to do this later
	 * is messy. We don't care to take a readlock to look at the ids
	 * in inode here, because we can't hold it across the trans_reserve.
	 * If the IDs do change before we take the ilock, we're covered
	 * because the i_*dquot fields will get updated anyway.
	 */
	if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
		uint	qflags = 0;

		if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
			uid = iattr->ia_uid;
			qflags |= XFS_QMOPT_UQUOTA;
		} else {
600
			uid = inode->i_uid;
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		}
		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
			gid = iattr->ia_gid;
			qflags |= XFS_QMOPT_GQUOTA;
		}  else {
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			gid = inode->i_gid;
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		}

		/*
		 * We take a reference when we initialize udqp and gdqp,
		 * so it is important that we never blindly double trip on
		 * the same variable. See xfs_create() for an example.
		 */
		ASSERT(udqp == NULL);
		ASSERT(gdqp == NULL);
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		error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
					   xfs_kgid_to_gid(gid),
					   xfs_get_projid(ip),
					   qflags, &udqp, &gdqp, NULL);
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		if (error)
			return error;
	}

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	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
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	if (error)
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		goto out_dqrele;
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	xfs_ilock(ip, XFS_ILOCK_EXCL);
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	xfs_trans_ijoin(tp, ip, 0);
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	/*
	 * Change file ownership.  Must be the owner or privileged.
	 */
	if (mask & (ATTR_UID|ATTR_GID)) {
		/*
		 * These IDs could have changed since we last looked at them.
		 * But, we're assured that if the ownership did change
		 * while we didn't have the inode locked, inode's dquot(s)
		 * would have changed also.
		 */
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		iuid = inode->i_uid;
		igid = inode->i_gid;
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		gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
		uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;

		/*
		 * Do a quota reservation only if uid/gid is actually
		 * going to change.
		 */
		if (XFS_IS_QUOTA_RUNNING(mp) &&
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		    ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
		     (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
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			ASSERT(tp);
			error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
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						NULL, capable(CAP_FOWNER) ?
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						XFS_QMOPT_FORCE_RES : 0);
			if (error)	/* out of quota */
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				goto out_cancel;
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		}
	}

	/*
	 * Change file ownership.  Must be the owner or privileged.
	 */
	if (mask & (ATTR_UID|ATTR_GID)) {
		/*
		 * CAP_FSETID overrides the following restrictions:
		 *
		 * The set-user-ID and set-group-ID bits of a file will be
		 * cleared upon successful return from chown()
		 */
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		if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
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		    !capable(CAP_FSETID))
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			inode->i_mode &= ~(S_ISUID|S_ISGID);
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		/*
		 * Change the ownerships and register quota modifications
		 * in the transaction.
		 */
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		if (!uid_eq(iuid, uid)) {
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			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
				ASSERT(mask & ATTR_UID);
				ASSERT(udqp);
				olddquot1 = xfs_qm_vop_chown(tp, ip,
							&ip->i_udquot, udqp);
			}
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			ip->i_d.di_uid = xfs_kuid_to_uid(uid);
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			inode->i_uid = uid;
		}
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		if (!gid_eq(igid, gid)) {
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			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
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				ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
				       !XFS_IS_PQUOTA_ON(mp));
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				ASSERT(mask & ATTR_GID);
				ASSERT(gdqp);
				olddquot2 = xfs_qm_vop_chown(tp, ip,
							&ip->i_gdquot, gdqp);
			}
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			ip->i_d.di_gid = xfs_kgid_to_gid(gid);
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			inode->i_gid = gid;
		}
	}

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	if (mask & ATTR_MODE)
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		xfs_setattr_mode(ip, iattr);
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	if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
		xfs_setattr_time(ip, iattr);
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	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

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	XFS_STATS_INC(mp, xs_ig_attrchg);
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	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);
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	error = xfs_trans_commit(tp);
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	xfs_iunlock(ip, XFS_ILOCK_EXCL);

	/*
	 * Release any dquot(s) the inode had kept before chown.
	 */
	xfs_qm_dqrele(olddquot1);
	xfs_qm_dqrele(olddquot2);
	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);

	if (error)
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		return error;
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	/*
	 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
	 * 	     update.  We could avoid this with linked transactions
	 * 	     and passing down the transaction pointer all the way
	 *	     to attr_set.  No previous user of the generic
	 * 	     Posix ACL code seems to care about this issue either.
	 */
	if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
738
		error = posix_acl_chmod(inode, inode->i_mode);
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		if (error)
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			return error;
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	}

	return 0;

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out_cancel:
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	xfs_trans_cancel(tp);
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out_dqrele:
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	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	return error;
}

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int
xfs_vn_setattr_nonsize(
	struct dentry		*dentry,
	struct iattr		*iattr)
{
	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
	int error;

	trace_xfs_setattr(ip);

	error = xfs_vn_change_ok(dentry, iattr);
	if (error)
		return error;
	return xfs_setattr_nonsize(ip, iattr, 0);
}

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/*
 * Truncate file.  Must have write permission and not be a directory.
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 *
 * Caution: The caller of this function is responsible for calling
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 * setattr_prepare() or otherwise verifying the change is fine.
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 */
int
xfs_setattr_size(
	struct xfs_inode	*ip,
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	struct iattr		*iattr)
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{
	struct xfs_mount	*mp = ip->i_mount;
	struct inode		*inode = VFS_I(ip);
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	xfs_off_t		oldsize, newsize;
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	struct xfs_trans	*tp;
	int			error;
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	uint			lock_flags = 0;
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	bool			did_zeroing = false;
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	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
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	ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
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	ASSERT(S_ISREG(inode->i_mode));
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	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
		ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
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	oldsize = inode->i_size;
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	newsize = iattr->ia_size;

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	/*
	 * Short circuit the truncate case for zero length files.
	 */
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	if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
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		if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
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			return 0;
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		/*
		 * Use the regular setattr path to update the timestamps.
		 */
		iattr->ia_valid &= ~ATTR_SIZE;
		return xfs_setattr_nonsize(ip, iattr, 0);
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	}

	/*
	 * Make sure that the dquots are attached to the inode.
	 */
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	error = xfs_qm_dqattach(ip, 0);
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	if (error)
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		return error;
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	/*
	 * Wait for all direct I/O to complete.
	 */
	inode_dio_wait(inode);

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	/*
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	 * File data changes must be complete before we start the transaction to
	 * modify the inode.  This needs to be done before joining the inode to
	 * the transaction because the inode cannot be unlocked once it is a
	 * part of the transaction.
	 *
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	 * Start with zeroing any data beyond EOF that we may expose on file
	 * extension, or zeroing out the rest of the block on a downward
	 * truncate.
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	 */
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	if (newsize > oldsize) {
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		error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
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	} else {
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		error = iomap_truncate_page(inode, newsize, &did_zeroing,
				&xfs_iomap_ops);
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	}

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	if (error)
		return error;

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	/*
	 * We are going to log the inode size change in this transaction so
	 * any previous writes that are beyond the on disk EOF and the new
	 * EOF that have not been written out need to be written here.  If we
	 * do not write the data out, we expose ourselves to the null files
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	 * problem. Note that this includes any block zeroing we did above;
	 * otherwise those blocks may not be zeroed after a crash.
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	 */
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	if (did_zeroing ||
	    (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
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		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
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						      ip->i_d.di_size, newsize);
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		if (error)
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			return error;
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	}

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	/*
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	 * We've already locked out new page faults, so now we can safely remove
	 * pages from the page cache knowing they won't get refaulted until we
	 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
	 * complete. The truncate_setsize() call also cleans partial EOF page
	 * PTEs on extending truncates and hence ensures sub-page block size
	 * filesystems are correctly handled, too.
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	 *
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	 * We have to do all the page cache truncate work outside the
	 * transaction context as the "lock" order is page lock->log space
	 * reservation as defined by extent allocation in the writeback path.
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	 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
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	 * having already truncated the in-memory version of the file (i.e. made
	 * user visible changes). There's not much we can do about this, except
	 * to hope that the caller sees ENOMEM and retries the truncate
	 * operation.
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	 */
	truncate_setsize(inode, newsize);
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	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
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	if (error)
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		return error;
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	lock_flags |= XFS_ILOCK_EXCL;
	xfs_ilock(ip, XFS_ILOCK_EXCL);
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	xfs_trans_ijoin(tp, ip, 0);
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	/*
	 * Only change the c/mtime if we are changing the size or we are
	 * explicitly asked to change it.  This handles the semantic difference
	 * between truncate() and ftruncate() as implemented in the VFS.
	 *
	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
	 * special case where we need to update the times despite not having
	 * these flags set.  For all other operations the VFS set these flags
	 * explicitly if it wants a timestamp update.
	 */
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	if (newsize != oldsize &&
	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
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		iattr->ia_ctime = iattr->ia_mtime =
			current_fs_time(inode->i_sb);
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		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
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	}

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	/*
	 * The first thing we do is set the size to new_size permanently on
	 * disk.  This way we don't have to worry about anyone ever being able
	 * to look at the data being freed even in the face of a crash.
	 * What we're getting around here is the case where we free a block, it
	 * is allocated to another file, it is written to, and then we crash.
	 * If the new data gets written to the file but the log buffers
	 * containing the free and reallocation don't, then we'd end up with
	 * garbage in the blocks being freed.  As long as we make the new size
	 * permanent before actually freeing any blocks it doesn't matter if
	 * they get written to.
	 */
	ip->i_d.di_size = newsize;
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	if (newsize <= oldsize) {
		error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
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		if (error)
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			goto out_trans_cancel;
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		/*
		 * Truncated "down", so we're removing references to old data
		 * here - if we delay flushing for a long time, we expose
		 * ourselves unduly to the notorious NULL files problem.  So,
		 * we mark this inode and flush it when the file is closed,
		 * and do not wait the usual (long) time for writeout.
		 */
		xfs_iflags_set(ip, XFS_ITRUNCATED);
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		/* A truncate down always removes post-EOF blocks. */
		xfs_inode_clear_eofblocks_tag(ip);
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	}

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	if (iattr->ia_valid & ATTR_MODE)
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		xfs_setattr_mode(ip, iattr);
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	if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
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		xfs_setattr_time(ip, iattr);
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	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

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	XFS_STATS_INC(mp, xs_ig_attrchg);
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	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);

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	error = xfs_trans_commit(tp);
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out_unlock:
	if (lock_flags)
		xfs_iunlock(ip, lock_flags);
	return error;

out_trans_cancel:
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	xfs_trans_cancel(tp);
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	goto out_unlock;
}

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int
xfs_vn_setattr_size(
	struct dentry		*dentry,
	struct iattr		*iattr)
{
	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
	int error;

	trace_xfs_setattr(ip);

	error = xfs_vn_change_ok(dentry, iattr);
	if (error)
		return error;
	return xfs_setattr_size(ip, iattr);
}

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STATIC int
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xfs_vn_setattr(
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	struct dentry		*dentry,
	struct iattr		*iattr)
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{
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	int			error;

	if (iattr->ia_valid & ATTR_SIZE) {
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		struct xfs_inode	*ip = XFS_I(d_inode(dentry));
		uint			iolock = XFS_IOLOCK_EXCL;
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		xfs_ilock(ip, iolock);
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		error = xfs_break_layouts(d_inode(dentry), &iolock, true);
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		if (!error) {
			xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
			iolock |= XFS_MMAPLOCK_EXCL;

992
			error = xfs_vn_setattr_size(dentry, iattr);
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		}
994
		xfs_iunlock(ip, iolock);
995
	} else {
996
		error = xfs_vn_setattr_nonsize(dentry, iattr);
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	}

999
	return error;
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}

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STATIC int
xfs_vn_update_time(
	struct inode		*inode,
	struct timespec		*now,
	int			flags)
{
	struct xfs_inode	*ip = XFS_I(inode);
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp;
	int			error;

	trace_xfs_update_time(ip);

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	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
	if (error)
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		return error;
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	xfs_ilock(ip, XFS_ILOCK_EXCL);
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	if (flags & S_CTIME)
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		inode->i_ctime = *now;
1022
	if (flags & S_MTIME)
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		inode->i_mtime = *now;
1024
	if (flags & S_ATIME)
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		inode->i_atime = *now;
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	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
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	return xfs_trans_commit(tp);
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}

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STATIC int
xfs_vn_fiemap(
	struct inode		*inode,
	struct fiemap_extent_info *fieinfo,
	u64			start,
	u64			length)
{
	int			error;

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	xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
	error = iomap_fiemap(inode, fieinfo, start, length, &xfs_iomap_ops);
	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
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1045
	return error;
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}

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STATIC int
xfs_vn_tmpfile(
	struct inode	*dir,
	struct dentry	*dentry,
	umode_t		mode)
{
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	return xfs_generic_create(dir, dentry, mode, 0, true);
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}

1057
static const struct inode_operations xfs_inode_operations = {
1058
	.get_acl		= xfs_get_acl,
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	.set_acl		= xfs_set_acl,
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	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
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	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
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	.listxattr		= xfs_vn_listxattr,
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	.fiemap			= xfs_vn_fiemap,
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	.update_time		= xfs_vn_update_time,
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};

1070
static const struct inode_operations xfs_dir_inode_operations = {
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	.create			= xfs_vn_create,
	.lookup			= xfs_vn_lookup,
	.link			= xfs_vn_link,
	.unlink			= xfs_vn_unlink,
	.symlink		= xfs_vn_symlink,
	.mkdir			= xfs_vn_mkdir,
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	/*
	 * Yes, XFS uses the same method for rmdir and unlink.
	 *
	 * There are some subtile differences deeper in the code,
	 * but we use S_ISDIR to check for those.
	 */
	.rmdir			= xfs_vn_unlink,
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	.mknod			= xfs_vn_mknod,
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	.rename2		= xfs_vn_rename,
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	.get_acl		= xfs_get_acl,
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	.set_acl		= xfs_set_acl,
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	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
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	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
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	.listxattr		= xfs_vn_listxattr,
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	.update_time		= xfs_vn_update_time,
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	.tmpfile		= xfs_vn_tmpfile,
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};

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static const struct inode_operations xfs_dir_ci_inode_operations = {
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	.create			= xfs_vn_create,
	.lookup			= xfs_vn_ci_lookup,
	.link			= xfs_vn_link,
	.unlink			= xfs_vn_unlink,
	.symlink		= xfs_vn_symlink,
	.mkdir			= xfs_vn_mkdir,
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	/*
	 * Yes, XFS uses the same method for rmdir and unlink.
	 *
	 * There are some subtile differences deeper in the code,
	 * but we use S_ISDIR to check for those.
	 */
	.rmdir			= xfs_vn_unlink,