[linux-block.git] / fs / reiserfs / xattr_acl.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/posix_acl.h>
#include "reiserfs.h"
#include <linux/errno.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/slab.h>
#include <linux/posix_acl_xattr.h>
#include "xattr.h"
#include "acl.h"
#include <linux/uaccess.h>

static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th,
			    struct inode *inode, int type,
			    struct posix_acl *acl);


int
reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
		 struct posix_acl *acl, int type)
{
	int error, error2;
	struct reiserfs_transaction_handle th;
	size_t jcreate_blocks;
	int size = acl ? posix_acl_xattr_size(acl->a_count) : 0;
	int update_mode = 0;
	umode_t mode = inode->i_mode;

	/*
	 * Pessimism: We can't assume that anything from the xattr root up
	 * has been created.
	 */

	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
			 reiserfs_xattr_nblocks(inode, size) * 2;

	reiserfs_write_lock(inode->i_sb);
	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
	reiserfs_write_unlock(inode->i_sb);
	if (error == 0) {
		if (type == ACL_TYPE_ACCESS && acl) {
			error = posix_acl_update_mode(&init_user_ns, inode,
						      &mode, &acl);
			if (error)
				goto unlock;
			update_mode = 1;
		}
		error = __reiserfs_set_acl(&th, inode, type, acl);
		if (!error && update_mode)
			inode->i_mode = mode;
unlock:
		reiserfs_write_lock(inode->i_sb);
		error2 = journal_end(&th);
		reiserfs_write_unlock(inode->i_sb);
		if (error2)
			error = error2;
	}

	return error;
}

/*
 * Convert from filesystem to in-memory representation.
 */
static struct posix_acl *reiserfs_posix_acl_from_disk(const void *value, size_t size)
{
	const char *end = (char *)value + size;
	int n, count;
	struct posix_acl *acl;

	if (!value)
		return NULL;
	if (size < sizeof(reiserfs_acl_header))
		return ERR_PTR(-EINVAL);
	if (((reiserfs_acl_header *) value)->a_version !=
	    cpu_to_le32(REISERFS_ACL_VERSION))
		return ERR_PTR(-EINVAL);
	value = (char *)value + sizeof(reiserfs_acl_header);
	count = reiserfs_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;
	acl = posix_acl_alloc(count, GFP_NOFS);
	if (!acl)
		return ERR_PTR(-ENOMEM);
	for (n = 0; n < count; n++) {
		reiserfs_acl_entry *entry = (reiserfs_acl_entry *) value;
		if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
			goto fail;
		acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
		switch (acl->a_entries[n].e_tag) {
		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			value = (char *)value +
			    sizeof(reiserfs_acl_entry_short);
			break;

		case ACL_USER:
			value = (char *)value + sizeof(reiserfs_acl_entry);
			if ((char *)value > end)
				goto fail;
			acl->a_entries[n].e_uid = 
				make_kuid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;
		case ACL_GROUP:
			value = (char *)value + sizeof(reiserfs_acl_entry);
			if ((char *)value > end)
				goto fail;
			acl->a_entries[n].e_gid =
				make_kgid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;

		default:
			goto fail;
		}
	}
	if (value != end)
		goto fail;
	return acl;

fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

/*
 * Convert from in-memory to filesystem representation.
 */
static void *reiserfs_posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
{
	reiserfs_acl_header *ext_acl;
	char *e;
	int n;

	*size = reiserfs_acl_size(acl->a_count);
	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
						  acl->a_count *
						  sizeof(reiserfs_acl_entry),
						  GFP_NOFS);
	if (!ext_acl)
		return ERR_PTR(-ENOMEM);
	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
	for (n = 0; n < acl->a_count; n++) {
		const struct posix_acl_entry *acl_e = &acl->a_entries[n];
		reiserfs_acl_entry *entry = (reiserfs_acl_entry *) e;
		entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
		entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
		switch (acl->a_entries[n].e_tag) {
		case ACL_USER:
			entry->e_id = cpu_to_le32(
				from_kuid(&init_user_ns, acl_e->e_uid));
			e += sizeof(reiserfs_acl_entry);
			break;
		case ACL_GROUP:
			entry->e_id = cpu_to_le32(
				from_kgid(&init_user_ns, acl_e->e_gid));
			e += sizeof(reiserfs_acl_entry);
			break;

		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			e += sizeof(reiserfs_acl_entry_short);
			break;

		default:
			goto fail;
		}
	}
	return (char *)ext_acl;

fail:
	kfree(ext_acl);
	return ERR_PTR(-EINVAL);
}

/*
 * Inode operation get_posix_acl().
 *
 * inode->i_mutex: down
 * BKL held [before 2.5.x]
 */
struct posix_acl *reiserfs_get_acl(struct inode *inode, int type, bool rcu)
{
	char *name, *value;
	struct posix_acl *acl;
	int size;
	int retval;

	if (rcu)
		return ERR_PTR(-ECHILD);

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		BUG();
	}

	size = reiserfs_xattr_get(inode, name, NULL, 0);
	if (size < 0) {
		if (size == -ENODATA || size == -ENOSYS)
			return NULL;
		return ERR_PTR(size);
	}

	value = kmalloc(size, GFP_NOFS);
	if (!value)
		return ERR_PTR(-ENOMEM);

	retval = reiserfs_xattr_get(inode, name, value, size);
	if (retval == -ENODATA || retval == -ENOSYS) {
		/*
		 * This shouldn't actually happen as it should have
		 * been caught above.. but just in case
		 */
		acl = NULL;
	} else if (retval < 0) {
		acl = ERR_PTR(retval);
	} else {
		acl = reiserfs_posix_acl_from_disk(value, retval);
	}

	kfree(value);
	return acl;
}

/*
 * Inode operation set_posix_acl().
 *
 * inode->i_mutex: down
 * BKL held [before 2.5.x]
 */
static int
__reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
		 int type, struct posix_acl *acl)
{
	char *name;
	void *value = NULL;
	size_t size = 0;
	int error;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		value = reiserfs_posix_acl_to_disk(acl, &size);
		if (IS_ERR(value))
			return (int)PTR_ERR(value);
	}

	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);

	/*
	 * Ensure that the inode gets dirtied if we're only using
	 * the mode bits and an old ACL didn't exist. We don't need
	 * to check if the inode is hashed here since we won't get
	 * called by reiserfs_inherit_default_acl().
	 */
	if (error == -ENODATA) {
		error = 0;
		if (type == ACL_TYPE_ACCESS) {
			inode->i_ctime = current_time(inode);
			mark_inode_dirty(inode);
		}
	}

	kfree(value);

	if (!error)
		set_cached_acl(inode, type, acl);

	return error;
}

/*
 * dir->i_mutex: locked,
 * inode is new and not released into the wild yet
 */
int
reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
			     struct inode *dir, struct dentry *dentry,
			     struct inode *inode)
{
	struct posix_acl *default_acl, *acl;
	int err = 0;

	/* ACLs only get applied to files and directories */
	if (S_ISLNK(inode->i_mode))
		return 0;

	/*
	 * ACLs can only be used on "new" objects, so if it's an old object
	 * there is nothing to inherit from
	 */
	if (get_inode_sd_version(dir) == STAT_DATA_V1)
		goto apply_umask;

	/*
	 * Don't apply ACLs to objects in the .reiserfs_priv tree.. This
	 * would be useless since permissions are ignored, and a pain because
	 * it introduces locking cycles
	 */
	if (IS_PRIVATE(inode))
		goto apply_umask;

	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	if (err)
		return err;

	if (default_acl) {
		err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
					 default_acl);
		posix_acl_release(default_acl);
	}
	if (acl) {
		if (!err)
			err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS,
						 acl);
		posix_acl_release(acl);
	}

	return err;

apply_umask:
	/* no ACL, apply umask */
	inode->i_mode &= ~current_umask();
	return err;
}

/* This is used to cache the default acl before a new object is created.
 * The biggest reason for this is to get an idea of how many blocks will
 * actually be required for the create operation if we must inherit an ACL.
 * An ACL write can add up to 3 object creations and an additional file write
 * so we'd prefer not to reserve that many blocks in the journal if we can.
 * It also has the advantage of not loading the ACL with a transaction open,
 * this may seem silly, but if the owner of the directory is doing the
 * creation, the ACL may not be loaded since the permissions wouldn't require
 * it.
 * We return the number of blocks required for the transaction.
 */
int reiserfs_cache_default_acl(struct inode *inode)
{
	struct posix_acl *acl;
	int nblocks = 0;

	if (IS_PRIVATE(inode))
		return 0;

	acl = get_acl(inode, ACL_TYPE_DEFAULT);

	if (acl && !IS_ERR(acl)) {
		int size = reiserfs_acl_size(acl->a_count);

		/* Other xattrs can be created during inode creation. We don't
		 * want to claim too many blocks, so we check to see if we
		 * need to create the tree to the xattrs, and then we
		 * just want two files. */
		nblocks = reiserfs_xattr_jcreate_nblocks(inode);
		nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);

		REISERFS_I(inode)->i_flags |= i_has_xattr_dir;

		/* We need to account for writes + bitmaps for two files */
		nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
		posix_acl_release(acl);
	}

	return nblocks;
}

/*
 * Called under i_mutex
 */
int reiserfs_acl_chmod(struct inode *inode)
{
	if (IS_PRIVATE(inode))
		return 0;
	if (get_inode_sd_version(inode) == STAT_DATA_V1 ||
	    !reiserfs_posixacl(inode->i_sb))
		return 0;

	return posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
16f7e0fe	2	#include <linux/capability.h>
1da177e4 LT	3	#include <linux/fs.h>
1da177e4 LT	4	#include <linux/posix_acl.h>
f466c6fd	5	#include "reiserfs.h"
1da177e4 LT	6	#include <linux/errno.h>
	7	#include <linux/pagemap.h>
	8	#include <linux/xattr.h>
5a0e3ad6	9	#include <linux/slab.h>
9a59f452	10	#include <linux/posix_acl_xattr.h>
c45ac888	11	#include "xattr.h"
a3063ab8	12	#include "acl.h"
17093991	13	#include <linux/uaccess.h>
1da177e4	14
47f70d08	15	static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th,
0ab2621e	16	struct inode *inode, int type,
bd4c625c	17	struct posix_acl *acl);
1da177e4	18
47f70d08 CH	19
47f70d08 CH	20	int
549c7297 CB	21	reiserfs_set_acl(struct user_namespace mnt_userns, struct inode inode,
549c7297 CB	22	struct posix_acl *acl, int type)
1da177e4	23	{
0ab2621e JM	24	int error, error2;
	25	struct reiserfs_transaction_handle th;
	26	size_t jcreate_blocks;
47f70d08	27	int size = acl ? posix_acl_xattr_size(acl->a_count) : 0;
fcea8aed EF	28	int update_mode = 0;
fcea8aed EF	29	umode_t mode = inode->i_mode;
1da177e4	30
098297b2 JM	31	/*
	32	* Pessimism: We can't assume that anything from the xattr root up
	33	* has been created.
	34	*/
0ab2621e JM	35
	36	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
	37	reiserfs_xattr_nblocks(inode, size) * 2;
	38
	39	reiserfs_write_lock(inode->i_sb);
	40	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
4c05141d	41	reiserfs_write_unlock(inode->i_sb);
0ab2621e	42	if (error == 0) {
6883cd7f	43	if (type == ACL_TYPE_ACCESS && acl) {
e65ce2a5 CB	44	error = posix_acl_update_mode(&init_user_ns, inode,
e65ce2a5 CB	45	&mode, &acl);
6883cd7f JK	46	if (error)
6883cd7f JK	47	goto unlock;
fcea8aed	48	update_mode = 1;
6883cd7f	49	}
47f70d08	50	error = __reiserfs_set_acl(&th, inode, type, acl);
fcea8aed EF	51	if (!error && update_mode)
fcea8aed EF	52	inode->i_mode = mode;
6883cd7f	53	unlock:
4c05141d	54	reiserfs_write_lock(inode->i_sb);
58d85426	55	error2 = journal_end(&th);
4c05141d	56	reiserfs_write_unlock(inode->i_sb);
0ab2621e JM	57	if (error2)
	58	error = error2;
	59	}
1da177e4	60
1da177e4 LT	61	return error;
	62	}
	63
1da177e4 LT	64	/*
	65	* Convert from filesystem to in-memory representation.
	66	*/
9dad943a	67	static struct posix_acl reiserfs_posix_acl_from_disk(const void value, size_t size)
1da177e4 LT	68	{
	69	const char end = (char )value + size;
	70	int n, count;
	71	struct posix_acl *acl;
	72
	73	if (!value)
	74	return NULL;
	75	if (size < sizeof(reiserfs_acl_header))
bd4c625c LT	76	return ERR_PTR(-EINVAL);
bd4c625c LT	77	if (((reiserfs_acl_header *) value)->a_version !=
1da177e4 LT	78	cpu_to_le32(REISERFS_ACL_VERSION))
	79	return ERR_PTR(-EINVAL);
	80	value = (char *)value + sizeof(reiserfs_acl_header);
	81	count = reiserfs_acl_count(size);
	82	if (count < 0)
	83	return ERR_PTR(-EINVAL);
	84	if (count == 0)
	85	return NULL;
	86	acl = posix_acl_alloc(count, GFP_NOFS);
	87	if (!acl)
	88	return ERR_PTR(-ENOMEM);
bd4c625c LT	89	for (n = 0; n < count; n++) {
bd4c625c LT	90	reiserfs_acl_entry entry = (reiserfs_acl_entry ) value;
1da177e4 LT	91	if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
1da177e4 LT	92	goto fail;
bd4c625c	93	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
1da177e4	94	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
bd4c625c LT	95	switch (acl->a_entries[n].e_tag) {
	96	case ACL_USER_OBJ:
	97	case ACL_GROUP_OBJ:
	98	case ACL_MASK:
	99	case ACL_OTHER:
	100	value = (char *)value +
	101	sizeof(reiserfs_acl_entry_short);
bd4c625c LT	102	break;
	103
	104	case ACL_USER:
df814654 EB	105	value = (char *)value + sizeof(reiserfs_acl_entry);
	106	if ((char *)value > end)
	107	goto fail;
	108	acl->a_entries[n].e_uid =
	109	make_kuid(&init_user_ns,
	110	le32_to_cpu(entry->e_id));
	111	break;
bd4c625c LT	112	case ACL_GROUP:
	113	value = (char *)value + sizeof(reiserfs_acl_entry);
	114	if ((char *)value > end)
1da177e4	115	goto fail;
df814654 EB	116	acl->a_entries[n].e_gid =
	117	make_kgid(&init_user_ns,
	118	le32_to_cpu(entry->e_id));
bd4c625c LT	119	break;
	120
	121	default:
	122	goto fail;
1da177e4 LT	123	}
	124	}
	125	if (value != end)
	126	goto fail;
	127	return acl;
	128
cf776a7a	129	fail:
1da177e4 LT	130	posix_acl_release(acl);
	131	return ERR_PTR(-EINVAL);
	132	}
	133
	134	/*
	135	* Convert from in-memory to filesystem representation.
	136	*/
9dad943a	137	static void reiserfs_posix_acl_to_disk(const struct posix_acl acl, size_t * size)
1da177e4 LT	138	{
	139	reiserfs_acl_header *ext_acl;
	140	char *e;
	141	int n;
	142
	143	*size = reiserfs_acl_size(acl->a_count);
5cbded58	144	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
bd4c625c LT	145	acl->a_count *
	146	sizeof(reiserfs_acl_entry),
	147	GFP_NOFS);
1da177e4 LT	148	if (!ext_acl)
	149	return ERR_PTR(-ENOMEM);
	150	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	151	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
bd4c625c	152	for (n = 0; n < acl->a_count; n++) {
df814654	153	const struct posix_acl_entry *acl_e = &acl->a_entries[n];
bd4c625c LT	154	reiserfs_acl_entry entry = (reiserfs_acl_entry ) e;
bd4c625c LT	155	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
1da177e4	156	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
bd4c625c LT	157	switch (acl->a_entries[n].e_tag) {
bd4c625c LT	158	case ACL_USER:
df814654 EB	159	entry->e_id = cpu_to_le32(
	160	from_kuid(&init_user_ns, acl_e->e_uid));
	161	e += sizeof(reiserfs_acl_entry);
	162	break;
bd4c625c	163	case ACL_GROUP:
df814654 EB	164	entry->e_id = cpu_to_le32(
df814654 EB	165	from_kgid(&init_user_ns, acl_e->e_gid));
bd4c625c LT	166	e += sizeof(reiserfs_acl_entry);
	167	break;
	168
	169	case ACL_USER_OBJ:
	170	case ACL_GROUP_OBJ:
	171	case ACL_MASK:
	172	case ACL_OTHER:
	173	e += sizeof(reiserfs_acl_entry_short);
	174	break;
	175
	176	default:
	177	goto fail;
1da177e4 LT	178	}
	179	}
	180	return (char *)ext_acl;
	181
cf776a7a	182	fail:
1da177e4 LT	183	kfree(ext_acl);
	184	return ERR_PTR(-EINVAL);
	185	}
	186
	187	/*
	188	* Inode operation get_posix_acl().
	189	*
1b1dcc1b	190	* inode->i_mutex: down
1da177e4 LT	191	* BKL held [before 2.5.x]
1da177e4 LT	192	*/
0cad6246	193	struct posix_acl reiserfs_get_acl(struct inode inode, int type, bool rcu)
1da177e4 LT	194	{
1da177e4 LT	195	char name, value;
073aaa1b	196	struct posix_acl *acl;
3cdc409c	197	int size;
1da177e4	198	int retval;
bd4c625c	199
0cad6246 MS	200	if (rcu)
	201	return ERR_PTR(-ECHILD);
	202
bd4c625c LT	203	switch (type) {
bd4c625c LT	204	case ACL_TYPE_ACCESS:
97d79299	205	name = XATTR_NAME_POSIX_ACL_ACCESS;
bd4c625c LT	206	break;
bd4c625c LT	207	case ACL_TYPE_DEFAULT:
97d79299	208	name = XATTR_NAME_POSIX_ACL_DEFAULT;
bd4c625c LT	209	break;
bd4c625c LT	210	default:
073aaa1b	211	BUG();
bd4c625c LT	212	}
bd4c625c LT	213
bd4c625c	214	size = reiserfs_xattr_get(inode, name, NULL, 0);
3cdc409c	215	if (size < 0) {
b8a7a3a6	216	if (size == -ENODATA \|\| size == -ENOSYS)
bd4c625c	217	return NULL;
bd4c625c LT	218	return ERR_PTR(size);
bd4c625c LT	219	}
1da177e4	220
bd4c625c LT	221	value = kmalloc(size, GFP_NOFS);
	222	if (!value)
	223	return ERR_PTR(-ENOMEM);
1da177e4 LT	224
	225	retval = reiserfs_xattr_get(inode, name, value, size);
	226	if (retval == -ENODATA \|\| retval == -ENOSYS) {
098297b2 JM	227	/*
	228	* This shouldn't actually happen as it should have
	229	* been caught above.. but just in case
	230	*/
1da177e4	231	acl = NULL;
bd4c625c	232	} else if (retval < 0) {
1da177e4 LT	233	acl = ERR_PTR(retval);
1da177e4 LT	234	} else {
9dad943a	235	acl = reiserfs_posix_acl_from_disk(value, retval);
bd4c625c	236	}
1da177e4 LT	237
	238	kfree(value);
	239	return acl;
	240	}
	241
	242	/*
	243	* Inode operation set_posix_acl().
	244	*
1b1dcc1b	245	* inode->i_mutex: down
1da177e4 LT	246	* BKL held [before 2.5.x]
	247	*/
	248	static int
47f70d08	249	__reiserfs_set_acl(struct reiserfs_transaction_handle th, struct inode inode,
0ab2621e	250	int type, struct posix_acl *acl)
1da177e4	251	{
bd4c625c	252	char *name;
1da177e4	253	void *value = NULL;
48b32a35	254	size_t size = 0;
1da177e4	255	int error;
1da177e4	256
bd4c625c LT	257	switch (type) {
bd4c625c LT	258	case ACL_TYPE_ACCESS:
97d79299	259	name = XATTR_NAME_POSIX_ACL_ACCESS;
bd4c625c LT	260	break;
bd4c625c LT	261	case ACL_TYPE_DEFAULT:
97d79299	262	name = XATTR_NAME_POSIX_ACL_DEFAULT;
bd4c625c LT	263	if (!S_ISDIR(inode->i_mode))
	264	return acl ? -EACCES : 0;
	265	break;
	266	default:
	267	return -EINVAL;
	268	}
	269
	270	if (acl) {
9dad943a	271	value = reiserfs_posix_acl_to_disk(acl, &size);
bd4c625c LT	272	if (IS_ERR(value))
bd4c625c LT	273	return (int)PTR_ERR(value);
48b32a35 JM	274	}
48b32a35 JM	275
0ab2621e	276	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);
48b32a35 JM	277
	278	/*
	279	* Ensure that the inode gets dirtied if we're only using
	280	* the mode bits and an old ACL didn't exist. We don't need
	281	* to check if the inode is hashed here since we won't get
	282	* called by reiserfs_inherit_default_acl().
	283	*/
	284	if (error == -ENODATA) {
	285	error = 0;
	286	if (type == ACL_TYPE_ACCESS) {
02027d42	287	inode->i_ctime = current_time(inode);
bd4c625c	288	mark_inode_dirty(inode);
bd4c625c LT	289	}
bd4c625c LT	290	}
1da177e4	291
833d304b	292	kfree(value);
1da177e4	293
d984561b	294	if (!error)
073aaa1b	295	set_cached_acl(inode, type, acl);
1da177e4 LT	296
	297	return error;
	298	}
	299
098297b2 JM	300	/*
	301	* dir->i_mutex: locked,
	302	* inode is new and not released into the wild yet
	303	*/
1da177e4	304	int
0ab2621e JM	305	reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	306	struct inode dir, struct dentry dentry,
bd4c625c	307	struct inode *inode)
1da177e4	308	{
47f70d08	309	struct posix_acl default_acl, acl;
bd4c625c LT	310	int err = 0;
	311
	312	/* ACLs only get applied to files and directories */
	313	if (S_ISLNK(inode->i_mode))
	314	return 0;
	315
098297b2 JM	316	/*
	317	* ACLs can only be used on "new" objects, so if it's an old object
	318	* there is nothing to inherit from
	319	*/
bd4c625c LT	320	if (get_inode_sd_version(dir) == STAT_DATA_V1)
	321	goto apply_umask;
	322
098297b2 JM	323	/*
098297b2 JM	324	* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
bd4c625c	325	* would be useless since permissions are ignored, and a pain because
098297b2 JM	326	* it introduces locking cycles
098297b2 JM	327	*/
60e4cf67	328	if (IS_PRIVATE(inode))
bd4c625c	329	goto apply_umask;
bd4c625c	330
47f70d08 CH	331	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	332	if (err)
	333	return err;
bd4c625c	334
47f70d08 CH	335	if (default_acl) {
	336	err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
	337	default_acl);
	338	posix_acl_release(default_acl);
	339	}
bd4c625c	340	if (acl) {
47f70d08 CH	341	if (!err)
	342	err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS,
	343	acl);
bd4c625c	344	posix_acl_release(acl);
bd4c625c LT	345	}
	346
	347	return err;
47f70d08	348
cf776a7a	349	apply_umask:
47f70d08 CH	350	/* no ACL, apply umask */
	351	inode->i_mode &= ~current_umask();
	352	return err;
1da177e4 LT	353	}
1da177e4 LT	354
0ab2621e JM	355	/* This is used to cache the default acl before a new object is created.
	356	* The biggest reason for this is to get an idea of how many blocks will
	357	* actually be required for the create operation if we must inherit an ACL.
	358	* An ACL write can add up to 3 object creations and an additional file write
	359	* so we'd prefer not to reserve that many blocks in the journal if we can.
	360	* It also has the advantage of not loading the ACL with a transaction open,
	361	* this may seem silly, but if the owner of the directory is doing the
	362	* creation, the ACL may not be loaded since the permissions wouldn't require
	363	* it.
	364	* We return the number of blocks required for the transaction.
	365	*/
bd4c625c	366	int reiserfs_cache_default_acl(struct inode *inode)
1da177e4	367	{
0ab2621e JM	368	struct posix_acl *acl;
	369	int nblocks = 0;
	370
	371	if (IS_PRIVATE(inode))
	372	return 0;
	373
7dffc87f	374	acl = get_acl(inode, ACL_TYPE_DEFAULT);
0ab2621e JM	375
	376	if (acl && !IS_ERR(acl)) {
	377	int size = reiserfs_acl_size(acl->a_count);
	378
	379	/* Other xattrs can be created during inode creation. We don't
	380	* want to claim too many blocks, so we check to see if we
9436fb4d	381	* need to create the tree to the xattrs, and then we
0ab2621e JM	382	* just want two files. */
	383	nblocks = reiserfs_xattr_jcreate_nblocks(inode);
	384	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	385
	386	REISERFS_I(inode)->i_flags \|= i_has_xattr_dir;
	387
	388	/* We need to account for writes + bitmaps for two files */
	389	nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
	390	posix_acl_release(acl);
bd4c625c LT	391	}
bd4c625c LT	392
0ab2621e	393	return nblocks;
1da177e4 LT	394	}
1da177e4 LT	395
4c05141d JM	396	/*
	397	* Called under i_mutex
	398	*/
bd4c625c	399	int reiserfs_acl_chmod(struct inode *inode)
1da177e4	400	{
4a857011 JM	401	if (IS_PRIVATE(inode))
4a857011 JM	402	return 0;
bd4c625c	403	if (get_inode_sd_version(inode) == STAT_DATA_V1 \|\|
47f70d08	404	!reiserfs_posixacl(inode->i_sb))
bd4c625c	405	return 0;
1da177e4	406
e65ce2a5	407	return posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
1da177e4	408	}