[mirror_ubuntu-bionic-kernel.git] / fs / overlayfs / inode.c

/*
 *
 * Copyright (C) 2011 Novell Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include "overlayfs.h"

static int ovl_copy_up_truncate(struct dentry *dentry)
{
	int err;
	struct dentry *parent;
	struct kstat stat;
	struct path lowerpath;

	parent = dget_parent(dentry);
	err = ovl_copy_up(parent);
	if (err)
		goto out_dput_parent;

	ovl_path_lower(dentry, &lowerpath);
	err = vfs_getattr(&lowerpath, &stat);
	if (err)
		goto out_dput_parent;

	stat.size = 0;
	err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat);

out_dput_parent:
	dput(parent);
	return err;
}

int ovl_setattr(struct dentry *dentry, struct iattr *attr)
{
	int err;
	struct dentry *upperdentry;

	/*
	 * Check for permissions before trying to copy-up.  This is redundant
	 * since it will be rechecked later by ->setattr() on upper dentry.  But
	 * without this, copy-up can be triggered by just about anybody.
	 *
	 * We don't initialize inode->size, which just means that
	 * inode_newsize_ok() will always check against MAX_LFS_FILESIZE and not
	 * check for a swapfile (which this won't be anyway).
	 */
	err = inode_change_ok(dentry->d_inode, attr);
	if (err)
		return err;

	err = ovl_want_write(dentry);
	if (err)
		goto out;

	err = ovl_copy_up(dentry);
	if (!err) {
		upperdentry = ovl_dentry_upper(dentry);

		inode_lock(upperdentry->d_inode);
		err = notify_change(upperdentry, attr, NULL);
		if (!err)
			ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
		inode_unlock(upperdentry->d_inode);
	}
	ovl_drop_write(dentry);
out:
	return err;
}

static int ovl_getattr(struct vfsmount *mnt, struct dentry *dentry,
			 struct kstat *stat)
{
	struct path realpath;

	ovl_path_real(dentry, &realpath);
	return vfs_getattr(&realpath, stat);
}

int ovl_permission(struct inode *inode, int mask)
{
	struct ovl_entry *oe;
	struct dentry *alias = NULL;
	struct inode *realinode;
	struct dentry *realdentry;
	bool is_upper;
	int err;

	if (S_ISDIR(inode->i_mode)) {
		oe = inode->i_private;
	} else if (mask & MAY_NOT_BLOCK) {
		return -ECHILD;
	} else {
		/*
		 * For non-directories find an alias and get the info
		 * from there.
		 */
		alias = d_find_any_alias(inode);
		if (WARN_ON(!alias))
			return -ENOENT;

		oe = alias->d_fsdata;
	}

	realdentry = ovl_entry_real(oe, &is_upper);

	if (ovl_is_default_permissions(inode)) {
		struct kstat stat;
		struct path realpath = { .dentry = realdentry };

		if (mask & MAY_NOT_BLOCK)
			return -ECHILD;

		realpath.mnt = ovl_entry_mnt_real(oe, inode, is_upper);

		err = vfs_getattr(&realpath, &stat);
		if (err)
			return err;

		if ((stat.mode ^ inode->i_mode) & S_IFMT)
			return -ESTALE;

		inode->i_mode = stat.mode;
		inode->i_uid = stat.uid;
		inode->i_gid = stat.gid;

		return generic_permission(inode, mask);
	}

	/* Careful in RCU walk mode */
	realinode = ACCESS_ONCE(realdentry->d_inode);
	if (!realinode) {
		WARN_ON(!(mask & MAY_NOT_BLOCK));
		err = -ENOENT;
		goto out_dput;
	}

	if (mask & MAY_WRITE) {
		umode_t mode = realinode->i_mode;

		/*
		 * Writes will always be redirected to upper layer, so
		 * ignore lower layer being read-only.
		 *
		 * If the overlay itself is read-only then proceed
		 * with the permission check, don't return EROFS.
		 * This will only happen if this is the lower layer of
		 * another overlayfs.
		 *
		 * If upper fs becomes read-only after the overlay was
		 * constructed return EROFS to prevent modification of
		 * upper layer.
		 */
		err = -EROFS;
		if (is_upper && !IS_RDONLY(inode) && IS_RDONLY(realinode) &&
		    (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
			goto out_dput;
	}

	err = __inode_permission(realinode, mask);
out_dput:
	dput(alias);
	return err;
}

static const char *ovl_get_link(struct dentry *dentry,
				struct inode *inode,
				struct delayed_call *done)
{
	struct dentry *realdentry;
	struct inode *realinode;

	if (!dentry)
		return ERR_PTR(-ECHILD);

	realdentry = ovl_dentry_real(dentry);
	realinode = realdentry->d_inode;

	if (WARN_ON(!realinode->i_op->get_link))
		return ERR_PTR(-EPERM);

	return realinode->i_op->get_link(realdentry, realinode, done);
}

static int ovl_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
{
	struct path realpath;
	struct inode *realinode;

	ovl_path_real(dentry, &realpath);
	realinode = realpath.dentry->d_inode;

	if (!realinode->i_op->readlink)
		return -EINVAL;

	touch_atime(&realpath);

	return realinode->i_op->readlink(realpath.dentry, buf, bufsiz);
}


static bool ovl_is_private_xattr(const char *name)
{
	return strncmp(name, OVL_XATTR_PRE_NAME, OVL_XATTR_PRE_LEN) == 0;
}

int ovl_setxattr(struct dentry *dentry, struct inode *inode,
		 const char *name, const void *value,
		 size_t size, int flags)
{
	int err;
	struct dentry *upperdentry;

	err = ovl_want_write(dentry);
	if (err)
		goto out;

	err = -EPERM;
	if (ovl_is_private_xattr(name))
		goto out_drop_write;

	err = ovl_copy_up(dentry);
	if (err)
		goto out_drop_write;

	upperdentry = ovl_dentry_upper(dentry);
	err = vfs_setxattr(upperdentry, name, value, size, flags);

out_drop_write:
	ovl_drop_write(dentry);
out:
	return err;
}

ssize_t ovl_getxattr(struct dentry *dentry, struct inode *inode,
		     const char *name, void *value, size_t size)
{
	struct dentry *realdentry = ovl_dentry_real(dentry);

	if (ovl_is_private_xattr(name))
		return -ENODATA;

	return vfs_getxattr(realdentry, name, value, size);
}

ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
{
	struct dentry *realdentry = ovl_dentry_real(dentry);
	ssize_t res;
	int off;

	res = vfs_listxattr(realdentry, list, size);
	if (res <= 0 || size == 0)
		return res;

	/* filter out private xattrs */
	for (off = 0; off < res;) {
		char *s = list + off;
		size_t slen = strlen(s) + 1;

		BUG_ON(off + slen > res);

		if (ovl_is_private_xattr(s)) {
			res -= slen;
			memmove(s, s + slen, res - off);
		} else {
			off += slen;
		}
	}

	return res;
}

int ovl_removexattr(struct dentry *dentry, const char *name)
{
	int err;
	struct path realpath;
	enum ovl_path_type type = ovl_path_real(dentry, &realpath);

	err = ovl_want_write(dentry);
	if (err)
		goto out;

	err = -ENODATA;
	if (ovl_is_private_xattr(name))
		goto out_drop_write;

	if (!OVL_TYPE_UPPER(type)) {
		err = vfs_getxattr(realpath.dentry, name, NULL, 0);
		if (err < 0)
			goto out_drop_write;

		err = ovl_copy_up(dentry);
		if (err)
			goto out_drop_write;

		ovl_path_upper(dentry, &realpath);
	}

	err = vfs_removexattr(realpath.dentry, name);
out_drop_write:
	ovl_drop_write(dentry);
out:
	return err;
}

static bool ovl_open_need_copy_up(int flags, enum ovl_path_type type,
				  struct dentry *realdentry)
{
	if (OVL_TYPE_UPPER(type))
		return false;

	if (special_file(realdentry->d_inode->i_mode))
		return false;

	if (!(OPEN_FMODE(flags) & FMODE_WRITE) && !(flags & O_TRUNC))
		return false;

	return true;
}

struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags)
{
	int err;
	struct path realpath;
	enum ovl_path_type type;

	if (d_is_dir(dentry))
		return d_backing_inode(dentry);

	type = ovl_path_real(dentry, &realpath);
	if (ovl_open_need_copy_up(file_flags, type, realpath.dentry)) {
		err = ovl_want_write(dentry);
		if (err)
			return ERR_PTR(err);

		if (file_flags & O_TRUNC)
			err = ovl_copy_up_truncate(dentry);
		else
			err = ovl_copy_up(dentry);
		ovl_drop_write(dentry);
		if (err)
			return ERR_PTR(err);

		ovl_path_upper(dentry, &realpath);
	}

	if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE)
		return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags);

	return d_backing_inode(realpath.dentry);
}

static const struct inode_operations ovl_file_inode_operations = {
	.setattr	= ovl_setattr,
	.permission	= ovl_permission,
	.getattr	= ovl_getattr,
	.setxattr	= ovl_setxattr,
	.getxattr	= ovl_getxattr,
	.listxattr	= ovl_listxattr,
	.removexattr	= ovl_removexattr,
};

static const struct inode_operations ovl_symlink_inode_operations = {
	.setattr	= ovl_setattr,
	.get_link	= ovl_get_link,
	.readlink	= ovl_readlink,
	.getattr	= ovl_getattr,
	.setxattr	= ovl_setxattr,
	.getxattr	= ovl_getxattr,
	.listxattr	= ovl_listxattr,
	.removexattr	= ovl_removexattr,
};

struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
			    struct ovl_entry *oe)
{
	struct inode *inode;

	inode = new_inode(sb);
	if (!inode)
		return NULL;

	mode &= S_IFMT;

	inode->i_ino = get_next_ino();
	inode->i_mode = mode;
	inode->i_flags |= S_NOATIME | S_NOCMTIME;

	switch (mode) {
	case S_IFDIR:
		inode->i_private = oe;
		inode->i_op = &ovl_dir_inode_operations;
		inode->i_fop = &ovl_dir_operations;
		break;

	case S_IFLNK:
		inode->i_op = &ovl_symlink_inode_operations;
		break;

	case S_IFREG:
	case S_IFSOCK:
	case S_IFBLK:
	case S_IFCHR:
	case S_IFIFO:
		inode->i_op = &ovl_file_inode_operations;
		break;

	default:
		WARN(1, "illegal file type: %i\n", mode);
		iput(inode);
		inode = NULL;
	}

	return inode;
}
Commit	Line	Data
e9be9d5e MS	1	/*
	2	*
	3	* Copyright (C) 2011 Novell Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 as published by
	7	* the Free Software Foundation.
	8	*/
	9
	10	#include <linux/fs.h>
	11	#include <linux/slab.h>
	12	#include <linux/xattr.h>
	13	#include "overlayfs.h"
	14
0f7ff2da	15	static int ovl_copy_up_truncate(struct dentry *dentry)
e9be9d5e MS	16	{
	17	int err;
	18	struct dentry *parent;
	19	struct kstat stat;
	20	struct path lowerpath;
	21
	22	parent = dget_parent(dentry);
	23	err = ovl_copy_up(parent);
	24	if (err)
	25	goto out_dput_parent;
	26
	27	ovl_path_lower(dentry, &lowerpath);
	28	err = vfs_getattr(&lowerpath, &stat);
	29	if (err)
	30	goto out_dput_parent;
	31
0f7ff2da AV	32	stat.size = 0;
0f7ff2da AV	33	err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat);
e9be9d5e MS	34
	35	out_dput_parent:
	36	dput(parent);
	37	return err;
	38	}
	39
	40	int ovl_setattr(struct dentry dentry, struct iattr attr)
	41	{
	42	int err;
	43	struct dentry *upperdentry;
	44
cf9a6784 MS	45	/*
	46	* Check for permissions before trying to copy-up. This is redundant
	47	* since it will be rechecked later by ->setattr() on upper dentry. But
	48	* without this, copy-up can be triggered by just about anybody.
	49	*
	50	* We don't initialize inode->size, which just means that
	51	* inode_newsize_ok() will always check against MAX_LFS_FILESIZE and not
	52	* check for a swapfile (which this won't be anyway).
	53	*/
	54	err = inode_change_ok(dentry->d_inode, attr);
	55	if (err)
	56	return err;
	57
e9be9d5e MS	58	err = ovl_want_write(dentry);
	59	if (err)
	60	goto out;
	61
acff81ec MS	62	err = ovl_copy_up(dentry);
	63	if (!err) {
	64	upperdentry = ovl_dentry_upper(dentry);
	65
5955102c	66	inode_lock(upperdentry->d_inode);
e9be9d5e	67	err = notify_change(upperdentry, attr, NULL);
b81de061 KK	68	if (!err)
b81de061 KK	69	ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
5955102c	70	inode_unlock(upperdentry->d_inode);
e9be9d5e MS	71	}
	72	ovl_drop_write(dentry);
	73	out:
	74	return err;
	75	}
	76
	77	static int ovl_getattr(struct vfsmount mnt, struct dentry dentry,
	78	struct kstat *stat)
	79	{
	80	struct path realpath;
	81
	82	ovl_path_real(dentry, &realpath);
	83	return vfs_getattr(&realpath, stat);
	84	}
	85
	86	int ovl_permission(struct inode *inode, int mask)
	87	{
	88	struct ovl_entry *oe;
	89	struct dentry *alias = NULL;
	90	struct inode *realinode;
	91	struct dentry *realdentry;
	92	bool is_upper;
	93	int err;
	94
	95	if (S_ISDIR(inode->i_mode)) {
	96	oe = inode->i_private;
	97	} else if (mask & MAY_NOT_BLOCK) {
	98	return -ECHILD;
	99	} else {
	100	/*
	101	* For non-directories find an alias and get the info
	102	* from there.
	103	*/
	104	alias = d_find_any_alias(inode);
	105	if (WARN_ON(!alias))
	106	return -ENOENT;
	107
	108	oe = alias->d_fsdata;
	109	}
	110
	111	realdentry = ovl_entry_real(oe, &is_upper);
	112
8d3095f4 MS	113	if (ovl_is_default_permissions(inode)) {
	114	struct kstat stat;
	115	struct path realpath = { .dentry = realdentry };
	116
	117	if (mask & MAY_NOT_BLOCK)
	118	return -ECHILD;
	119
	120	realpath.mnt = ovl_entry_mnt_real(oe, inode, is_upper);
	121
	122	err = vfs_getattr(&realpath, &stat);
	123	if (err)
	124	return err;
	125
	126	if ((stat.mode ^ inode->i_mode) & S_IFMT)
	127	return -ESTALE;
	128
	129	inode->i_mode = stat.mode;
	130	inode->i_uid = stat.uid;
	131	inode->i_gid = stat.gid;
	132
	133	return generic_permission(inode, mask);
	134	}
	135
e9be9d5e MS	136	/* Careful in RCU walk mode */
	137	realinode = ACCESS_ONCE(realdentry->d_inode);
	138	if (!realinode) {
	139	WARN_ON(!(mask & MAY_NOT_BLOCK));
	140	err = -ENOENT;
	141	goto out_dput;
	142	}
	143
	144	if (mask & MAY_WRITE) {
	145	umode_t mode = realinode->i_mode;
	146
	147	/*
	148	* Writes will always be redirected to upper layer, so
	149	* ignore lower layer being read-only.
	150	*
	151	* If the overlay itself is read-only then proceed
	152	* with the permission check, don't return EROFS.
	153	* This will only happen if this is the lower layer of
	154	* another overlayfs.
	155	*
	156	* If upper fs becomes read-only after the overlay was
	157	* constructed return EROFS to prevent modification of
	158	* upper layer.
	159	*/
	160	err = -EROFS;
	161	if (is_upper && !IS_RDONLY(inode) && IS_RDONLY(realinode) &&
	162	(S_ISREG(mode) \|\| S_ISDIR(mode) \|\| S_ISLNK(mode)))
	163	goto out_dput;
	164	}
	165
	166	err = __inode_permission(realinode, mask);
	167	out_dput:
	168	dput(alias);
	169	return err;
	170	}
	171
6b255391	172	static const char ovl_get_link(struct dentry dentry,
fceef393 AV	173	struct inode *inode,
fceef393 AV	174	struct delayed_call *done)
e9be9d5e	175	{
e9be9d5e MS	176	struct dentry *realdentry;
	177	struct inode *realinode;
	178
6b255391 AV	179	if (!dentry)
	180	return ERR_PTR(-ECHILD);
	181
e9be9d5e MS	182	realdentry = ovl_dentry_real(dentry);
	183	realinode = realdentry->d_inode;
	184
6b255391	185	if (WARN_ON(!realinode->i_op->get_link))
e9be9d5e MS	186	return ERR_PTR(-EPERM);
e9be9d5e MS	187
fceef393	188	return realinode->i_op->get_link(realdentry, realinode, done);
e9be9d5e MS	189	}
	190
	191	static int ovl_readlink(struct dentry dentry, char __user buf, int bufsiz)
	192	{
	193	struct path realpath;
	194	struct inode *realinode;
	195
	196	ovl_path_real(dentry, &realpath);
	197	realinode = realpath.dentry->d_inode;
	198
	199	if (!realinode->i_op->readlink)
	200	return -EINVAL;
	201
	202	touch_atime(&realpath);
	203
	204	return realinode->i_op->readlink(realpath.dentry, buf, bufsiz);
	205	}
	206
	207
	208	static bool ovl_is_private_xattr(const char *name)
	209	{
cead89bb	210	return strncmp(name, OVL_XATTR_PRE_NAME, OVL_XATTR_PRE_LEN) == 0;
e9be9d5e MS	211	}
e9be9d5e MS	212
3767e255 AV	213	int ovl_setxattr(struct dentry dentry, struct inode inode,
	214	const char name, const void value,
	215	size_t size, int flags)
e9be9d5e MS	216	{
	217	int err;
	218	struct dentry *upperdentry;
	219
	220	err = ovl_want_write(dentry);
	221	if (err)
	222	goto out;
	223
	224	err = -EPERM;
	225	if (ovl_is_private_xattr(name))
	226	goto out_drop_write;
	227
	228	err = ovl_copy_up(dentry);
	229	if (err)
	230	goto out_drop_write;
	231
	232	upperdentry = ovl_dentry_upper(dentry);
	233	err = vfs_setxattr(upperdentry, name, value, size, flags);
	234
	235	out_drop_write:
	236	ovl_drop_write(dentry);
	237	out:
	238	return err;
	239	}
	240
ce23e640 AV	241	ssize_t ovl_getxattr(struct dentry dentry, struct inode inode,
ce23e640 AV	242	const char name, void value, size_t size)
e9be9d5e	243	{
b581755b	244	struct dentry *realdentry = ovl_dentry_real(dentry);
52148463	245
b581755b	246	if (ovl_is_private_xattr(name))
e9be9d5e MS	247	return -ENODATA;
e9be9d5e MS	248
b581755b	249	return vfs_getxattr(realdentry, name, value, size);
e9be9d5e MS	250	}
	251
	252	ssize_t ovl_listxattr(struct dentry dentry, char list, size_t size)
	253	{
b581755b	254	struct dentry *realdentry = ovl_dentry_real(dentry);
e9be9d5e MS	255	ssize_t res;
	256	int off;
	257
b581755b	258	res = vfs_listxattr(realdentry, list, size);
e9be9d5e MS	259	if (res <= 0 \|\| size == 0)
	260	return res;
	261
e9be9d5e MS	262	/* filter out private xattrs */
	263	for (off = 0; off < res;) {
	264	char *s = list + off;
	265	size_t slen = strlen(s) + 1;
	266
	267	BUG_ON(off + slen > res);
	268
	269	if (ovl_is_private_xattr(s)) {
	270	res -= slen;
	271	memmove(s, s + slen, res - off);
	272	} else {
	273	off += slen;
	274	}
	275	}
	276
	277	return res;
	278	}
	279
	280	int ovl_removexattr(struct dentry dentry, const char name)
	281	{
	282	int err;
	283	struct path realpath;
52148463	284	enum ovl_path_type type = ovl_path_real(dentry, &realpath);
e9be9d5e MS	285
	286	err = ovl_want_write(dentry);
	287	if (err)
	288	goto out;
	289
52148463	290	err = -ENODATA;
b581755b	291	if (ovl_is_private_xattr(name))
e9be9d5e MS	292	goto out_drop_write;
e9be9d5e MS	293
1afaba1e	294	if (!OVL_TYPE_UPPER(type)) {
e9be9d5e MS	295	err = vfs_getxattr(realpath.dentry, name, NULL, 0);
	296	if (err < 0)
	297	goto out_drop_write;
	298
	299	err = ovl_copy_up(dentry);
	300	if (err)
	301	goto out_drop_write;
	302
	303	ovl_path_upper(dentry, &realpath);
	304	}
	305
	306	err = vfs_removexattr(realpath.dentry, name);
	307	out_drop_write:
	308	ovl_drop_write(dentry);
	309	out:
	310	return err;
	311	}
	312
	313	static bool ovl_open_need_copy_up(int flags, enum ovl_path_type type,
	314	struct dentry *realdentry)
	315	{
1afaba1e	316	if (OVL_TYPE_UPPER(type))
e9be9d5e MS	317	return false;
	318
	319	if (special_file(realdentry->d_inode->i_mode))
	320	return false;
	321
	322	if (!(OPEN_FMODE(flags) & FMODE_WRITE) && !(flags & O_TRUNC))
	323	return false;
	324
	325	return true;
	326	}
	327
4bacc9c9	328	struct inode ovl_d_select_inode(struct dentry dentry, unsigned file_flags)
e9be9d5e MS	329	{
	330	int err;
	331	struct path realpath;
	332	enum ovl_path_type type;
e9be9d5e	333
9391dd00 AV	334	if (d_is_dir(dentry))
	335	return d_backing_inode(dentry);
	336
e9be9d5e	337	type = ovl_path_real(dentry, &realpath);
4bacc9c9	338	if (ovl_open_need_copy_up(file_flags, type, realpath.dentry)) {
e9be9d5e MS	339	err = ovl_want_write(dentry);
e9be9d5e MS	340	if (err)
4bacc9c9	341	return ERR_PTR(err);
e9be9d5e	342
4bacc9c9	343	if (file_flags & O_TRUNC)
0f7ff2da	344	err = ovl_copy_up_truncate(dentry);
e9be9d5e MS	345	else
e9be9d5e MS	346	err = ovl_copy_up(dentry);
f25801ee	347	ovl_drop_write(dentry);
e9be9d5e	348	if (err)
4bacc9c9	349	return ERR_PTR(err);
e9be9d5e MS	350
	351	ovl_path_upper(dentry, &realpath);
	352	}
	353
1c8a47df MS	354	if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE)
	355	return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags);
	356
4bacc9c9	357	return d_backing_inode(realpath.dentry);
e9be9d5e MS	358	}
	359
	360	static const struct inode_operations ovl_file_inode_operations = {
	361	.setattr = ovl_setattr,
	362	.permission = ovl_permission,
	363	.getattr = ovl_getattr,
	364	.setxattr = ovl_setxattr,
	365	.getxattr = ovl_getxattr,
	366	.listxattr = ovl_listxattr,
	367	.removexattr = ovl_removexattr,
e9be9d5e MS	368	};
	369
	370	static const struct inode_operations ovl_symlink_inode_operations = {
	371	.setattr = ovl_setattr,
6b255391	372	.get_link = ovl_get_link,
e9be9d5e MS	373	.readlink = ovl_readlink,
	374	.getattr = ovl_getattr,
	375	.setxattr = ovl_setxattr,
	376	.getxattr = ovl_getxattr,
	377	.listxattr = ovl_listxattr,
	378	.removexattr = ovl_removexattr,
	379	};
	380
	381	struct inode ovl_new_inode(struct super_block sb, umode_t mode,
	382	struct ovl_entry *oe)
	383	{
	384	struct inode *inode;
	385
	386	inode = new_inode(sb);
	387	if (!inode)
	388	return NULL;
	389
	390	mode &= S_IFMT;
	391
	392	inode->i_ino = get_next_ino();
	393	inode->i_mode = mode;
	394	inode->i_flags \|= S_NOATIME \| S_NOCMTIME;
	395
	396	switch (mode) {
	397	case S_IFDIR:
	398	inode->i_private = oe;
	399	inode->i_op = &ovl_dir_inode_operations;
	400	inode->i_fop = &ovl_dir_operations;
	401	break;
	402
	403	case S_IFLNK:
	404	inode->i_op = &ovl_symlink_inode_operations;
	405	break;
	406
	407	case S_IFREG:
	408	case S_IFSOCK:
	409	case S_IFBLK:
	410	case S_IFCHR:
	411	case S_IFIFO:
	412	inode->i_op = &ovl_file_inode_operations;
	413	break;
	414
	415	default:
	416	WARN(1, "illegal file type: %i\n", mode);
	417	iput(inode);
	418	inode = NULL;
	419	}
	420
	421	return inode;
e9be9d5e	422	}