xfs_iops.c 32.1 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_sb.h"
#include "xfs_ag.h"
#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"
#include "xfs_dir2_priv.h"
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#include "xfs_dinode.h"
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#include "xfs_trans_space.h"
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#include <linux/capability.h>
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#include <linux/xattr.h>
#include <linux/namei.h>
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#include <linux/posix_acl.h>
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#include <linux/security.h>
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#include <linux/fiemap.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++) {
		error = xfs_attr_set(ip, xattr->name, xattr->value,
				     xattr->value_len, ATTR_SECURE);
		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,
					    &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);
		if (error)
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			goto out_cleanup_inode;
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	}
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	if (acl) {
		error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
		if (error)
			goto out_cleanup_inode;
	}
#endif
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	if (tmpfile)
		d_tmpfile(dentry, inode);
	else
		d_instantiate(dentry, inode);

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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;

 out_cleanup_inode:
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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);
		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)) {
		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 = old_dentry->d_inode;
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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(dentry->d_inode));
	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;

	d_instantiate(dentry, inode);
	return 0;

 out_cleanup_inode:
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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;
}

STATIC int
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xfs_vn_rename(
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	struct inode	*odir,
	struct dentry	*odentry,
	struct inode	*ndir,
	struct dentry	*ndentry)
{
	struct inode	*new_inode = ndentry->d_inode;
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	struct xfs_name	oname;
	struct xfs_name	nname;
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	xfs_dentry_to_name(&oname, odentry, 0);
	xfs_dentry_to_name(&nname, ndentry, odentry->d_inode->i_mode);
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	return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
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			   XFS_I(ndir), &nname, new_inode ?
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						XFS_I(new_inode) : NULL);
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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 void *
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xfs_vn_follow_link(
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	struct dentry		*dentry,
	struct nameidata	*nd)
{
	char			*link;
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	int			error = -ENOMEM;
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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(dentry->d_inode), link);
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	if (unlikely(error))
		goto out_kfree;
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	nd_set_link(nd, link);
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	return NULL;
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 out_kfree:
	kfree(link);
 out_err:
	nd_set_link(nd, ERR_PTR(error));
	return NULL;
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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 = dentry->d_inode;
	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 -XFS_ERROR(EIO);
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	stat->size = XFS_ISIZE(ip);
	stat->dev = inode->i_sb->s_dev;
	stat->mode = ip->i_d.di_mode;
	stat->nlink = ip->i_d.di_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));

	ip->i_d.di_mode &= S_IFMT;
	ip->i_d.di_mode |= mode & ~S_IFMT;

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

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

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

	if (iattr->ia_valid & ATTR_ATIME) {
		inode->i_atime = iattr->ia_atime;
		ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
		ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
	}
	if (iattr->ia_valid & ATTR_CTIME) {
		inode->i_ctime = iattr->ia_ctime;
		ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
		ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
	}
	if (iattr->ia_valid & ATTR_MTIME) {
		inode->i_mtime = iattr->ia_mtime;
		ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
		ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
	}
}

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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;

	trace_xfs_setattr(ip);

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	/* If acls are being inherited, we already have this checked */
	if (!(flags & XFS_ATTR_NOACL)) {
		if (mp->m_flags & XFS_MOUNT_RDONLY)
			return XFS_ERROR(EROFS);
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		if (XFS_FORCED_SHUTDOWN(mp))
			return XFS_ERROR(EIO);
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		error = -inode_change_ok(inode, iattr);
		if (error)
			return XFS_ERROR(error);
	}
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	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 {
576
			uid = inode->i_uid;
C
Christoph Hellwig 已提交
577 578 579 580 581
		}
		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
			gid = iattr->ia_gid;
			qflags |= XFS_QMOPT_GQUOTA;
		}  else {
582
			gid = inode->i_gid;
C
Christoph Hellwig 已提交
583 584 585 586 587 588 589 590 591
		}

		/*
		 * 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);
592 593 594 595
		error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
					   xfs_kgid_to_gid(gid),
					   xfs_get_projid(ip),
					   qflags, &udqp, &gdqp, NULL);
C
Christoph Hellwig 已提交
596 597 598 599 600
		if (error)
			return error;
	}

	tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
601
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
C
Christoph Hellwig 已提交
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
	if (error)
		goto out_dqrele;

	xfs_ilock(ip, XFS_ILOCK_EXCL);

	/*
	 * 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.
		 */
617 618
		iuid = inode->i_uid;
		igid = inode->i_gid;
C
Christoph Hellwig 已提交
619 620 621 622 623 624 625 626
		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) &&
627 628
		    ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
		     (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
C
Christoph Hellwig 已提交
629 630
			ASSERT(tp);
			error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
631
						NULL, capable(CAP_FOWNER) ?
C
Christoph Hellwig 已提交
632 633 634 635 636 637
						XFS_QMOPT_FORCE_RES : 0);
			if (error)	/* out of quota */
				goto out_trans_cancel;
		}
	}

638
	xfs_trans_ijoin(tp, ip, 0);
C
Christoph Hellwig 已提交
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657

	/*
	 * 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()
		 */
		if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
		    !capable(CAP_FSETID))
			ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);

		/*
		 * Change the ownerships and register quota modifications
		 * in the transaction.
		 */
658
		if (!uid_eq(iuid, uid)) {
C
Christoph Hellwig 已提交
659 660 661 662 663 664
			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);
			}
665
			ip->i_d.di_uid = xfs_kuid_to_uid(uid);
C
Christoph Hellwig 已提交
666 667
			inode->i_uid = uid;
		}
668
		if (!gid_eq(igid, gid)) {
C
Christoph Hellwig 已提交
669
			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
670 671
				ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
				       !XFS_IS_PQUOTA_ON(mp));
C
Christoph Hellwig 已提交
672 673 674 675 676
				ASSERT(mask & ATTR_GID);
				ASSERT(gdqp);
				olddquot2 = xfs_qm_vop_chown(tp, ip,
							&ip->i_gdquot, gdqp);
			}
677
			ip->i_d.di_gid = xfs_kgid_to_gid(gid);
C
Christoph Hellwig 已提交
678 679 680 681
			inode->i_gid = gid;
		}
	}

682
	if (mask & ATTR_MODE)
683
		xfs_setattr_mode(ip, iattr);
C
Christoph Hellwig 已提交
684 685
	if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
		xfs_setattr_time(ip, iattr);
C
Christoph Hellwig 已提交
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715

	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	XFS_STATS_INC(xs_ig_attrchg);

	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);
	error = xfs_trans_commit(tp, 0);

	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)
		return XFS_ERROR(error);

	/*
	 * 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)) {
716
		error = -posix_acl_chmod(inode, inode->i_mode);
C
Christoph Hellwig 已提交
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737
		if (error)
			return XFS_ERROR(error);
	}

	return 0;

out_trans_cancel:
	xfs_trans_cancel(tp, 0);
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
out_dqrele:
	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	return error;
}

/*
 * Truncate file.  Must have write permission and not be a directory.
 */
int
xfs_setattr_size(
	struct xfs_inode	*ip,
738
	struct iattr		*iattr)
C
Christoph Hellwig 已提交
739 740 741
{
	struct xfs_mount	*mp = ip->i_mount;
	struct inode		*inode = VFS_I(ip);
742
	xfs_off_t		oldsize, newsize;
C
Christoph Hellwig 已提交
743 744
	struct xfs_trans	*tp;
	int			error;
745
	uint			lock_flags = 0;
C
Christoph Hellwig 已提交
746 747 748 749 750 751 752 753 754 755 756 757 758 759
	uint			commit_flags = 0;

	trace_xfs_setattr(ip);

	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return XFS_ERROR(EROFS);

	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);

	error = -inode_change_ok(inode, iattr);
	if (error)
		return XFS_ERROR(error);

760
	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
C
Christoph Hellwig 已提交
761
	ASSERT(S_ISREG(ip->i_d.di_mode));
762 763
	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
		ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
C
Christoph Hellwig 已提交
764

765
	oldsize = inode->i_size;
766 767
	newsize = iattr->ia_size;

C
Christoph Hellwig 已提交
768 769 770
	/*
	 * Short circuit the truncate case for zero length files.
	 */
771
	if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
772
		if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
773
			return 0;
774 775 776 777 778 779

		/*
		 * Use the regular setattr path to update the timestamps.
		 */
		iattr->ia_valid &= ~ATTR_SIZE;
		return xfs_setattr_nonsize(ip, iattr, 0);
C
Christoph Hellwig 已提交
780 781 782 783 784
	}

	/*
	 * Make sure that the dquots are attached to the inode.
	 */
785
	error = xfs_qm_dqattach(ip, 0);
C
Christoph Hellwig 已提交
786
	if (error)
787
		return error;
C
Christoph Hellwig 已提交
788 789 790 791 792 793 794 795

	/*
	 * Now we can make the changes.  Before we join the inode to the
	 * transaction, take care of the part of the truncation that must be
	 * done without the inode lock.  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.
	 */
796
	if (newsize > oldsize) {
C
Christoph Hellwig 已提交
797 798 799 800 801 802
		/*
		 * Do the first part of growing a file: zero any data in the
		 * last block that is beyond the old EOF.  We need to do this
		 * before the inode is joined to the transaction to modify
		 * i_size.
		 */
803
		error = xfs_zero_eof(ip, newsize, oldsize);
C
Christoph Hellwig 已提交
804
		if (error)
805
			return error;
C
Christoph Hellwig 已提交
806 807 808 809 810 811 812 813 814 815 816 817 818 819
	}

	/*
	 * 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
	 * problem.
	 *
	 * Only flush from the on disk size to the smaller of the in memory
	 * file size or the new size as that's the range we really care about
	 * here and prevents waiting for other data not within the range we
	 * care about here.
	 */
820
	if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) {
D
Dave Chinner 已提交
821 822
		error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
						      ip->i_d.di_size, newsize);
C
Christoph Hellwig 已提交
823
		if (error)
824
			return error;
C
Christoph Hellwig 已提交
825 826 827
	}

	/*
C
Christoph Hellwig 已提交
828
	 * Wait for all direct I/O to complete.
C
Christoph Hellwig 已提交
829
	 */
C
Christoph Hellwig 已提交
830
	inode_dio_wait(inode);
C
Christoph Hellwig 已提交
831

832
	error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
C
Christoph Hellwig 已提交
833
	if (error)
834
		return error;
C
Christoph Hellwig 已提交
835 836

	tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
837
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
C
Christoph Hellwig 已提交
838 839 840
	if (error)
		goto out_trans_cancel;

841
	truncate_setsize(inode, newsize);
C
Christoph Hellwig 已提交
842 843 844 845 846 847

	commit_flags = XFS_TRANS_RELEASE_LOG_RES;
	lock_flags |= XFS_ILOCK_EXCL;

	xfs_ilock(ip, XFS_ILOCK_EXCL);

848
	xfs_trans_ijoin(tp, ip, 0);
C
Christoph Hellwig 已提交
849 850 851 852 853 854 855 856 857 858 859

	/*
	 * 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.
	 */
860 861
	if (newsize != oldsize &&
	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
C
Christoph Hellwig 已提交
862 863
		iattr->ia_ctime = iattr->ia_mtime =
			current_fs_time(inode->i_sb);
864
		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
C
Christoph Hellwig 已提交
865 866
	}

867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
	/*
	 * 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);
C
Christoph Hellwig 已提交
884 885 886 887 888 889 890 891 892 893 894
		if (error)
			goto out_trans_abort;

		/*
		 * 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);
895 896 897

		/* A truncate down always removes post-EOF blocks. */
		xfs_inode_clear_eofblocks_tag(ip);
C
Christoph Hellwig 已提交
898 899
	}

900
	if (iattr->ia_valid & ATTR_MODE)
901
		xfs_setattr_mode(ip, iattr);
902
	if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
C
Christoph Hellwig 已提交
903
		xfs_setattr_time(ip, iattr);
C
Christoph Hellwig 已提交
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924

	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	XFS_STATS_INC(xs_ig_attrchg);

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

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

out_trans_abort:
	commit_flags |= XFS_TRANS_ABORT;
out_trans_cancel:
	xfs_trans_cancel(tp, commit_flags);
	goto out_unlock;
}

L
Linus Torvalds 已提交
925
STATIC int
926
xfs_vn_setattr(
927 928
	struct dentry		*dentry,
	struct iattr		*iattr)
L
Linus Torvalds 已提交
929
{
930 931 932 933 934 935 936 937 938 939 940 941
	struct xfs_inode	*ip = XFS_I(dentry->d_inode);
	int			error;

	if (iattr->ia_valid & ATTR_SIZE) {
		xfs_ilock(ip, XFS_IOLOCK_EXCL);
		error = xfs_setattr_size(ip, iattr);
		xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	} else {
		error = xfs_setattr_nonsize(ip, iattr, 0);
	}

	return -error;
L
Linus Torvalds 已提交
942 943
}

C
Christoph Hellwig 已提交
944 945 946 947 948 949 950 951 952 953 954 955 956 957
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);

	tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
958
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0);
C
Christoph Hellwig 已提交
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
	if (error) {
		xfs_trans_cancel(tp, 0);
		return -error;
	}

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	if (flags & S_CTIME) {
		inode->i_ctime = *now;
		ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
		ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
	}
	if (flags & S_MTIME) {
		inode->i_mtime = *now;
		ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
		ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
	}
	if (flags & S_ATIME) {
		inode->i_atime = *now;
		ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
		ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
	}
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
	return -xfs_trans_commit(tp, 0);
}

E
Eric Sandeen 已提交
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
#define XFS_FIEMAP_FLAGS	(FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)

/*
 * Call fiemap helper to fill in user data.
 * Returns positive errors to xfs_getbmap.
 */
STATIC int
xfs_fiemap_format(
	void			**arg,
	struct getbmapx		*bmv,
	int			*full)
{
	int			error;
	struct fiemap_extent_info *fieinfo = *arg;
	u32			fiemap_flags = 0;
	u64			logical, physical, length;

	/* Do nothing for a hole */
	if (bmv->bmv_block == -1LL)
		return 0;

	logical = BBTOB(bmv->bmv_offset);
	physical = BBTOB(bmv->bmv_block);
	length = BBTOB(bmv->bmv_length);

	if (bmv->bmv_oflags & BMV_OF_PREALLOC)
		fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
	else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
1013 1014
		fiemap_flags |= (FIEMAP_EXTENT_DELALLOC |
				 FIEMAP_EXTENT_UNKNOWN);
E
Eric Sandeen 已提交
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
		physical = 0;   /* no block yet */
	}
	if (bmv->bmv_oflags & BMV_OF_LAST)
		fiemap_flags |= FIEMAP_EXTENT_LAST;

	error = fiemap_fill_next_extent(fieinfo, logical, physical,
					length, fiemap_flags);
	if (error > 0) {
		error = 0;
		*full = 1;	/* user array now full */
	}

	return -error;
}

STATIC int
xfs_vn_fiemap(
	struct inode		*inode,
	struct fiemap_extent_info *fieinfo,
	u64			start,
	u64			length)
{
	xfs_inode_t		*ip = XFS_I(inode);
	struct getbmapx		bm;
	int			error;

	error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
	if (error)
		return error;

	/* Set up bmap header for xfs internal routine */
	bm.bmv_offset = BTOBB(start);
	/* Special case for whole file */
	if (length == FIEMAP_MAX_OFFSET)
		bm.bmv_length = -1LL;
	else
		bm.bmv_length = BTOBB(length);

1053
	/* We add one because in getbmap world count includes the header */
T
Tao Ma 已提交
1054 1055 1056 1057
	bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
					fieinfo->fi_extents_max + 1;
	bm.bmv_count = min_t(__s32, bm.bmv_count,
			     (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
T
Tao Ma 已提交
1058
	bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
E
Eric Sandeen 已提交
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
		bm.bmv_iflags |= BMV_IF_ATTRFORK;
	if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
		bm.bmv_iflags |= BMV_IF_DELALLOC;

	error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
	if (error)
		return -error;

	return 0;
}

Z
Zhi Yong Wu 已提交
1071 1072 1073 1074 1075 1076
STATIC int
xfs_vn_tmpfile(
	struct inode	*dir,
	struct dentry	*dentry,
	umode_t		mode)
{
1077
	return xfs_generic_create(dir, dentry, mode, 0, true);
Z
Zhi Yong Wu 已提交
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}

1080
static const struct inode_operations xfs_inode_operations = {
1081
	.get_acl		= xfs_get_acl,
1082
	.set_acl		= xfs_set_acl,
1083 1084
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1085 1086 1087
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1088
	.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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};

1093
static const struct inode_operations xfs_dir_inode_operations = {
1094 1095 1096 1097 1098 1099
	.create			= xfs_vn_create,
	.lookup			= xfs_vn_lookup,
	.link			= xfs_vn_link,
	.unlink			= xfs_vn_unlink,
	.symlink		= xfs_vn_symlink,
	.mkdir			= xfs_vn_mkdir,
1100 1101 1102 1103 1104 1105 1106
	/*
	 * 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,
1107 1108
	.mknod			= xfs_vn_mknod,
	.rename			= xfs_vn_rename,
1109
	.get_acl		= xfs_get_acl,
1110
	.set_acl		= xfs_set_acl,
1111 1112
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1113 1114 1115
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1116
	.listxattr		= xfs_vn_listxattr,
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Christoph Hellwig 已提交
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	.update_time		= xfs_vn_update_time,
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Zhi Yong Wu 已提交
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	.tmpfile		= xfs_vn_tmpfile,
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};

1121
static const struct inode_operations xfs_dir_ci_inode_operations = {
1122 1123 1124 1125 1126 1127
	.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,
1128 1129 1130 1131 1132 1133 1134
	/*
	 * 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,
1135 1136
	.mknod			= xfs_vn_mknod,
	.rename			= xfs_vn_rename,
1137
	.get_acl		= xfs_get_acl,
1138
	.set_acl		= xfs_set_acl,
1139 1140
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1141 1142 1143
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1144
	.listxattr		= xfs_vn_listxattr,
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	.update_time		= xfs_vn_update_time,
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Zhi Yong Wu 已提交
1146
	.tmpfile		= xfs_vn_tmpfile,
1147 1148
};

1149
static const struct inode_operations xfs_symlink_inode_operations = {
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Linus Torvalds 已提交
1150
	.readlink		= generic_readlink,
1151
	.follow_link		= xfs_vn_follow_link,
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1152
	.put_link		= kfree_put_link,
1153 1154
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1155 1156 1157
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1158
	.listxattr		= xfs_vn_listxattr,
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	.update_time		= xfs_vn_update_time,
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};
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191

STATIC void
xfs_diflags_to_iflags(
	struct inode		*inode,
	struct xfs_inode	*ip)
{
	if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;
	if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
	if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
		inode->i_flags |= S_SYNC;
	else
		inode->i_flags &= ~S_SYNC;
	if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
		inode->i_flags |= S_NOATIME;
	else
		inode->i_flags &= ~S_NOATIME;
}

/*
 * Initialize the Linux inode, set up the operation vectors and
 * unlock the inode.
 *
 * When reading existing inodes from disk this is called directly
 * from xfs_iget, when creating a new inode it is called from
 * xfs_ialloc after setting up the inode.
1192 1193 1194 1195
 *
 * We are always called with an uninitialised linux inode here.
 * We need to initialise the necessary fields and take a reference
 * on it.
1196 1197 1198 1199 1200
 */
void
xfs_setup_inode(
	struct xfs_inode	*ip)
{
1201
	struct inode		*inode = &ip->i_vnode;
1202
	gfp_t			gfp_mask;
1203 1204

	inode->i_ino = ip->i_ino;
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1205
	inode->i_state = I_NEW;
1206 1207

	inode_sb_list_add(inode);
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1208 1209
	/* make the inode look hashed for the writeback code */
	hlist_add_fake(&inode->i_hash);
1210 1211

	inode->i_mode	= ip->i_d.di_mode;
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	set_nlink(inode, ip->i_d.di_nlink);
1213 1214
	inode->i_uid    = xfs_uid_to_kuid(ip->i_d.di_uid);
	inode->i_gid    = xfs_gid_to_kgid(ip->i_d.di_gid);
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237

	switch (inode->i_mode & S_IFMT) {
	case S_IFBLK:
	case S_IFCHR:
		inode->i_rdev =
			MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
			      sysv_minor(ip->i_df.if_u2.if_rdev));
		break;
	default:
		inode->i_rdev = 0;
		break;
	}

	inode->i_generation = ip->i_d.di_gen;
	i_size_write(inode, ip->i_d.di_size);
	inode->i_atime.tv_sec	= ip->i_d.di_atime.t_sec;
	inode->i_atime.tv_nsec	= ip->i_d.di_atime.t_nsec;
	inode->i_mtime.tv_sec	= ip->i_d.di_mtime.t_sec;
	inode->i_mtime.tv_nsec	= ip->i_d.di_mtime.t_nsec;
	inode->i_ctime.tv_sec	= ip->i_d.di_ctime.t_sec;
	inode->i_ctime.tv_nsec	= ip->i_d.di_ctime.t_nsec;
	xfs_diflags_to_iflags(inode, ip);

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Dave Chinner 已提交
1238
	ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1239
	lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1240 1241 1242 1243 1244 1245 1246
	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &xfs_inode_operations;
		inode->i_fop = &xfs_file_operations;
		inode->i_mapping->a_ops = &xfs_address_space_operations;
		break;
	case S_IFDIR:
1247
		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1248 1249 1250 1251 1252
		if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
			inode->i_op = &xfs_dir_ci_inode_operations;
		else
			inode->i_op = &xfs_dir_inode_operations;
		inode->i_fop = &xfs_dir_file_operations;
1253
		ip->d_ops = ip->i_mount->m_dir_inode_ops;
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
		break;
	case S_IFLNK:
		inode->i_op = &xfs_symlink_inode_operations;
		if (!(ip->i_df.if_flags & XFS_IFINLINE))
			inode->i_mapping->a_ops = &xfs_address_space_operations;
		break;
	default:
		inode->i_op = &xfs_inode_operations;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		break;
	}

1266 1267 1268 1269 1270 1271 1272 1273
	/*
	 * Ensure all page cache allocations are done from GFP_NOFS context to
	 * prevent direct reclaim recursion back into the filesystem and blowing
	 * stacks or deadlocking.
	 */
	gfp_mask = mapping_gfp_mask(inode->i_mapping);
	mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));

1274 1275 1276 1277 1278 1279
	/*
	 * If there is no attribute fork no ACL can exist on this inode,
	 * and it can't have any file capabilities attached to it either.
	 */
	if (!XFS_IFORK_Q(ip)) {
		inode_has_no_xattr(inode);
1280
		cache_no_acl(inode);
1281
	}
1282

1283 1284 1285 1286 1287
	xfs_iflags_clear(ip, XFS_INEW);
	barrier();

	unlock_new_inode(inode);
}