[mirror_ubuntu-artful-kernel.git] / fs / reiserfs / xattr_acl.c

#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 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;


	/*
	 * 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) {
		error = __reiserfs_set_acl(&th, inode, type, acl);
		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)
{
	char *name, *value;
	struct posix_acl *acl;
	int size;
	int retval;

	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;
		if (acl) {
			error = posix_acl_equiv_mode(acl, &inode->i_mode);
			if (error < 0)
				return error;
			else {
				if (error == 0)
					acl = NULL;
			}
		}
		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_SEC;
			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(dir)) {
		inode->i_flags |= S_PRIVATE;
		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
		 * 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(inode, inode->i_mode);
}
Commit	Line	Data
16f7e0fe	1	#include <linux/capability.h>
1da177e4 LT	2	#include <linux/fs.h>
1da177e4 LT	3	#include <linux/posix_acl.h>
f466c6fd	4	#include "reiserfs.h"
1da177e4 LT	5	#include <linux/errno.h>
	6	#include <linux/pagemap.h>
	7	#include <linux/xattr.h>
5a0e3ad6	8	#include <linux/slab.h>
9a59f452	9	#include <linux/posix_acl_xattr.h>
c45ac888	10	#include "xattr.h"
a3063ab8	11	#include "acl.h"
17093991	12	#include <linux/uaccess.h>
1da177e4	13
47f70d08	14	static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th,
0ab2621e	15	struct inode *inode, int type,
bd4c625c	16	struct posix_acl *acl);
1da177e4	17
47f70d08 CH	18
	19	int
	20	reiserfs_set_acl(struct inode inode, struct posix_acl acl, int type)
1da177e4	21	{
0ab2621e JM	22	int error, error2;
	23	struct reiserfs_transaction_handle th;
	24	size_t jcreate_blocks;
47f70d08 CH	25	int size = acl ? posix_acl_xattr_size(acl->a_count) : 0;
47f70d08 CH	26
1da177e4	27
098297b2 JM	28	/*
	29	* Pessimism: We can't assume that anything from the xattr root up
	30	* has been created.
	31	*/
0ab2621e JM	32
	33	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
	34	reiserfs_xattr_nblocks(inode, size) * 2;
	35
	36	reiserfs_write_lock(inode->i_sb);
	37	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
4c05141d	38	reiserfs_write_unlock(inode->i_sb);
0ab2621e	39	if (error == 0) {
47f70d08	40	error = __reiserfs_set_acl(&th, inode, type, acl);
4c05141d	41	reiserfs_write_lock(inode->i_sb);
58d85426	42	error2 = journal_end(&th);
4c05141d	43	reiserfs_write_unlock(inode->i_sb);
0ab2621e JM	44	if (error2)
	45	error = error2;
	46	}
1da177e4	47
1da177e4 LT	48	return error;
	49	}
	50
1da177e4 LT	51	/*
	52	* Convert from filesystem to in-memory representation.
	53	*/
9dad943a	54	static struct posix_acl reiserfs_posix_acl_from_disk(const void value, size_t size)
1da177e4 LT	55	{
	56	const char end = (char )value + size;
	57	int n, count;
	58	struct posix_acl *acl;
	59
	60	if (!value)
	61	return NULL;
	62	if (size < sizeof(reiserfs_acl_header))
bd4c625c LT	63	return ERR_PTR(-EINVAL);
bd4c625c LT	64	if (((reiserfs_acl_header *) value)->a_version !=
1da177e4 LT	65	cpu_to_le32(REISERFS_ACL_VERSION))
	66	return ERR_PTR(-EINVAL);
	67	value = (char *)value + sizeof(reiserfs_acl_header);
	68	count = reiserfs_acl_count(size);
	69	if (count < 0)
	70	return ERR_PTR(-EINVAL);
	71	if (count == 0)
	72	return NULL;
	73	acl = posix_acl_alloc(count, GFP_NOFS);
	74	if (!acl)
	75	return ERR_PTR(-ENOMEM);
bd4c625c LT	76	for (n = 0; n < count; n++) {
bd4c625c LT	77	reiserfs_acl_entry entry = (reiserfs_acl_entry ) value;
1da177e4 LT	78	if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
1da177e4 LT	79	goto fail;
bd4c625c	80	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
1da177e4	81	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
bd4c625c LT	82	switch (acl->a_entries[n].e_tag) {
	83	case ACL_USER_OBJ:
	84	case ACL_GROUP_OBJ:
	85	case ACL_MASK:
	86	case ACL_OTHER:
	87	value = (char *)value +
	88	sizeof(reiserfs_acl_entry_short);
bd4c625c LT	89	break;
	90
	91	case ACL_USER:
df814654 EB	92	value = (char *)value + sizeof(reiserfs_acl_entry);
	93	if ((char *)value > end)
	94	goto fail;
	95	acl->a_entries[n].e_uid =
	96	make_kuid(&init_user_ns,
	97	le32_to_cpu(entry->e_id));
	98	break;
bd4c625c LT	99	case ACL_GROUP:
	100	value = (char *)value + sizeof(reiserfs_acl_entry);
	101	if ((char *)value > end)
1da177e4	102	goto fail;
df814654 EB	103	acl->a_entries[n].e_gid =
	104	make_kgid(&init_user_ns,
	105	le32_to_cpu(entry->e_id));
bd4c625c LT	106	break;
	107
	108	default:
	109	goto fail;
1da177e4 LT	110	}
	111	}
	112	if (value != end)
	113	goto fail;
	114	return acl;
	115
cf776a7a	116	fail:
1da177e4 LT	117	posix_acl_release(acl);
	118	return ERR_PTR(-EINVAL);
	119	}
	120
	121	/*
	122	* Convert from in-memory to filesystem representation.
	123	*/
9dad943a	124	static void reiserfs_posix_acl_to_disk(const struct posix_acl acl, size_t * size)
1da177e4 LT	125	{
	126	reiserfs_acl_header *ext_acl;
	127	char *e;
	128	int n;
	129
	130	*size = reiserfs_acl_size(acl->a_count);
5cbded58	131	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
bd4c625c LT	132	acl->a_count *
	133	sizeof(reiserfs_acl_entry),
	134	GFP_NOFS);
1da177e4 LT	135	if (!ext_acl)
	136	return ERR_PTR(-ENOMEM);
	137	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	138	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
bd4c625c	139	for (n = 0; n < acl->a_count; n++) {
df814654	140	const struct posix_acl_entry *acl_e = &acl->a_entries[n];
bd4c625c LT	141	reiserfs_acl_entry entry = (reiserfs_acl_entry ) e;
bd4c625c LT	142	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
1da177e4	143	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
bd4c625c LT	144	switch (acl->a_entries[n].e_tag) {
bd4c625c LT	145	case ACL_USER:
df814654 EB	146	entry->e_id = cpu_to_le32(
	147	from_kuid(&init_user_ns, acl_e->e_uid));
	148	e += sizeof(reiserfs_acl_entry);
	149	break;
bd4c625c	150	case ACL_GROUP:
df814654 EB	151	entry->e_id = cpu_to_le32(
df814654 EB	152	from_kgid(&init_user_ns, acl_e->e_gid));
bd4c625c LT	153	e += sizeof(reiserfs_acl_entry);
	154	break;
	155
	156	case ACL_USER_OBJ:
	157	case ACL_GROUP_OBJ:
	158	case ACL_MASK:
	159	case ACL_OTHER:
	160	e += sizeof(reiserfs_acl_entry_short);
	161	break;
	162
	163	default:
	164	goto fail;
1da177e4 LT	165	}
	166	}
	167	return (char *)ext_acl;
	168
cf776a7a	169	fail:
1da177e4 LT	170	kfree(ext_acl);
	171	return ERR_PTR(-EINVAL);
	172	}
	173
	174	/*
	175	* Inode operation get_posix_acl().
	176	*
1b1dcc1b	177	* inode->i_mutex: down
1da177e4 LT	178	* BKL held [before 2.5.x]
1da177e4 LT	179	*/
bd4c625c	180	struct posix_acl reiserfs_get_acl(struct inode inode, int type)
1da177e4 LT	181	{
1da177e4 LT	182	char name, value;
073aaa1b	183	struct posix_acl *acl;
3cdc409c	184	int size;
1da177e4	185	int retval;
bd4c625c LT	186
	187	switch (type) {
	188	case ACL_TYPE_ACCESS:
97d79299	189	name = XATTR_NAME_POSIX_ACL_ACCESS;
bd4c625c LT	190	break;
bd4c625c LT	191	case ACL_TYPE_DEFAULT:
97d79299	192	name = XATTR_NAME_POSIX_ACL_DEFAULT;
bd4c625c LT	193	break;
bd4c625c LT	194	default:
073aaa1b	195	BUG();
bd4c625c LT	196	}
bd4c625c LT	197
bd4c625c	198	size = reiserfs_xattr_get(inode, name, NULL, 0);
3cdc409c	199	if (size < 0) {
b8a7a3a6	200	if (size == -ENODATA \|\| size == -ENOSYS)
bd4c625c	201	return NULL;
bd4c625c LT	202	return ERR_PTR(size);
bd4c625c LT	203	}
1da177e4	204
bd4c625c LT	205	value = kmalloc(size, GFP_NOFS);
	206	if (!value)
	207	return ERR_PTR(-ENOMEM);
1da177e4 LT	208
	209	retval = reiserfs_xattr_get(inode, name, value, size);
	210	if (retval == -ENODATA \|\| retval == -ENOSYS) {
098297b2 JM	211	/*
	212	* This shouldn't actually happen as it should have
	213	* been caught above.. but just in case
	214	*/
1da177e4	215	acl = NULL;
bd4c625c	216	} else if (retval < 0) {
1da177e4 LT	217	acl = ERR_PTR(retval);
1da177e4 LT	218	} else {
9dad943a	219	acl = reiserfs_posix_acl_from_disk(value, retval);
bd4c625c	220	}
1da177e4 LT	221
	222	kfree(value);
	223	return acl;
	224	}
	225
	226	/*
	227	* Inode operation set_posix_acl().
	228	*
1b1dcc1b	229	* inode->i_mutex: down
1da177e4 LT	230	* BKL held [before 2.5.x]
	231	*/
	232	static int
47f70d08	233	__reiserfs_set_acl(struct reiserfs_transaction_handle th, struct inode inode,
0ab2621e	234	int type, struct posix_acl *acl)
1da177e4	235	{
bd4c625c	236	char *name;
1da177e4	237	void *value = NULL;
48b32a35	238	size_t size = 0;
1da177e4	239	int error;
1da177e4	240
bd4c625c LT	241	switch (type) {
bd4c625c LT	242	case ACL_TYPE_ACCESS:
97d79299	243	name = XATTR_NAME_POSIX_ACL_ACCESS;
bd4c625c	244	if (acl) {
d6952123	245	error = posix_acl_equiv_mode(acl, &inode->i_mode);
bd4c625c LT	246	if (error < 0)
	247	return error;
	248	else {
bd4c625c LT	249	if (error == 0)
	250	acl = NULL;
	251	}
	252	}
	253	break;
	254	case ACL_TYPE_DEFAULT:
97d79299	255	name = XATTR_NAME_POSIX_ACL_DEFAULT;
bd4c625c LT	256	if (!S_ISDIR(inode->i_mode))
	257	return acl ? -EACCES : 0;
	258	break;
	259	default:
	260	return -EINVAL;
	261	}
	262
	263	if (acl) {
9dad943a	264	value = reiserfs_posix_acl_to_disk(acl, &size);
bd4c625c LT	265	if (IS_ERR(value))
bd4c625c LT	266	return (int)PTR_ERR(value);
48b32a35 JM	267	}
48b32a35 JM	268
0ab2621e	269	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);
48b32a35 JM	270
	271	/*
	272	* Ensure that the inode gets dirtied if we're only using
	273	* the mode bits and an old ACL didn't exist. We don't need
	274	* to check if the inode is hashed here since we won't get
	275	* called by reiserfs_inherit_default_acl().
	276	*/
	277	if (error == -ENODATA) {
	278	error = 0;
	279	if (type == ACL_TYPE_ACCESS) {
	280	inode->i_ctime = CURRENT_TIME_SEC;
bd4c625c	281	mark_inode_dirty(inode);
bd4c625c LT	282	}
bd4c625c LT	283	}
1da177e4	284
833d304b	285	kfree(value);
1da177e4	286
d984561b	287	if (!error)
073aaa1b	288	set_cached_acl(inode, type, acl);
1da177e4 LT	289
	290	return error;
	291	}
	292
098297b2 JM	293	/*
	294	* dir->i_mutex: locked,
	295	* inode is new and not released into the wild yet
	296	*/
1da177e4	297	int
0ab2621e JM	298	reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	299	struct inode dir, struct dentry dentry,
bd4c625c	300	struct inode *inode)
1da177e4	301	{
47f70d08	302	struct posix_acl default_acl, acl;
bd4c625c LT	303	int err = 0;
	304
	305	/* ACLs only get applied to files and directories */
	306	if (S_ISLNK(inode->i_mode))
	307	return 0;
	308
098297b2 JM	309	/*
	310	* ACLs can only be used on "new" objects, so if it's an old object
	311	* there is nothing to inherit from
	312	*/
bd4c625c LT	313	if (get_inode_sd_version(dir) == STAT_DATA_V1)
	314	goto apply_umask;
	315
098297b2 JM	316	/*
098297b2 JM	317	* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
bd4c625c	318	* would be useless since permissions are ignored, and a pain because
098297b2 JM	319	* it introduces locking cycles
098297b2 JM	320	*/
6dfede69 JM	321	if (IS_PRIVATE(dir)) {
6dfede69 JM	322	inode->i_flags \|= S_PRIVATE;
bd4c625c LT	323	goto apply_umask;
	324	}
	325
47f70d08 CH	326	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	327	if (err)
	328	return err;
bd4c625c	329
47f70d08 CH	330	if (default_acl) {
	331	err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
	332	default_acl);
	333	posix_acl_release(default_acl);
	334	}
bd4c625c	335	if (acl) {
47f70d08 CH	336	if (!err)
	337	err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS,
	338	acl);
bd4c625c	339	posix_acl_release(acl);
bd4c625c LT	340	}
	341
	342	return err;
47f70d08	343
cf776a7a	344	apply_umask:
47f70d08 CH	345	/* no ACL, apply umask */
	346	inode->i_mode &= ~current_umask();
	347	return err;
1da177e4 LT	348	}
1da177e4 LT	349
0ab2621e JM	350	/* This is used to cache the default acl before a new object is created.
	351	* The biggest reason for this is to get an idea of how many blocks will
	352	* actually be required for the create operation if we must inherit an ACL.
	353	* An ACL write can add up to 3 object creations and an additional file write
	354	* so we'd prefer not to reserve that many blocks in the journal if we can.
	355	* It also has the advantage of not loading the ACL with a transaction open,
	356	* this may seem silly, but if the owner of the directory is doing the
	357	* creation, the ACL may not be loaded since the permissions wouldn't require
	358	* it.
	359	* We return the number of blocks required for the transaction.
	360	*/
bd4c625c	361	int reiserfs_cache_default_acl(struct inode *inode)
1da177e4	362	{
0ab2621e JM	363	struct posix_acl *acl;
	364	int nblocks = 0;
	365
	366	if (IS_PRIVATE(inode))
	367	return 0;
	368
7dffc87f	369	acl = get_acl(inode, ACL_TYPE_DEFAULT);
0ab2621e JM	370
	371	if (acl && !IS_ERR(acl)) {
	372	int size = reiserfs_acl_size(acl->a_count);
	373
	374	/* Other xattrs can be created during inode creation. We don't
	375	* want to claim too many blocks, so we check to see if we
	376	* we need to create the tree to the xattrs, and then we
	377	* just want two files. */
	378	nblocks = reiserfs_xattr_jcreate_nblocks(inode);
	379	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	380
	381	REISERFS_I(inode)->i_flags \|= i_has_xattr_dir;
	382
	383	/* We need to account for writes + bitmaps for two files */
	384	nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
	385	posix_acl_release(acl);
bd4c625c LT	386	}
bd4c625c LT	387
0ab2621e	388	return nblocks;
1da177e4 LT	389	}
1da177e4 LT	390
4c05141d JM	391	/*
	392	* Called under i_mutex
	393	*/
bd4c625c	394	int reiserfs_acl_chmod(struct inode *inode)
1da177e4	395	{
4a857011 JM	396	if (IS_PRIVATE(inode))
4a857011 JM	397	return 0;
bd4c625c	398	if (get_inode_sd_version(inode) == STAT_DATA_V1 \|\|
47f70d08	399	!reiserfs_posixacl(inode->i_sb))
bd4c625c	400	return 0;
1da177e4	401
47f70d08	402	return posix_acl_chmod(inode, inode->i_mode);
1da177e4	403	}