[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;
	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(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)
{
	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;
		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(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	25	int size = acl ? posix_acl_xattr_size(acl->a_count) : 0;
fcea8aed EF	26	int update_mode = 0;
fcea8aed EF	27	umode_t mode = inode->i_mode;
1da177e4	28
098297b2 JM	29	/*
	30	* Pessimism: We can't assume that anything from the xattr root up
	31	* has been created.
	32	*/
0ab2621e JM	33
	34	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
	35	reiserfs_xattr_nblocks(inode, size) * 2;
	36
	37	reiserfs_write_lock(inode->i_sb);
	38	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
4c05141d	39	reiserfs_write_unlock(inode->i_sb);
0ab2621e	40	if (error == 0) {
6883cd7f	41	if (type == ACL_TYPE_ACCESS && acl) {
fcea8aed	42	error = posix_acl_update_mode(inode, &mode, &acl);
6883cd7f JK	43	if (error)
6883cd7f JK	44	goto unlock;
fcea8aed	45	update_mode = 1;
6883cd7f	46	}
47f70d08	47	error = __reiserfs_set_acl(&th, inode, type, acl);
fcea8aed EF	48	if (!error && update_mode)
fcea8aed EF	49	inode->i_mode = mode;
6883cd7f	50	unlock:
4c05141d	51	reiserfs_write_lock(inode->i_sb);
58d85426	52	error2 = journal_end(&th);
4c05141d	53	reiserfs_write_unlock(inode->i_sb);
0ab2621e JM	54	if (error2)
	55	error = error2;
	56	}
1da177e4	57
1da177e4 LT	58	return error;
	59	}
	60
1da177e4 LT	61	/*
	62	* Convert from filesystem to in-memory representation.
	63	*/
9dad943a	64	static struct posix_acl reiserfs_posix_acl_from_disk(const void value, size_t size)
1da177e4 LT	65	{
	66	const char end = (char )value + size;
	67	int n, count;
	68	struct posix_acl *acl;
	69
	70	if (!value)
	71	return NULL;
	72	if (size < sizeof(reiserfs_acl_header))
bd4c625c LT	73	return ERR_PTR(-EINVAL);
bd4c625c LT	74	if (((reiserfs_acl_header *) value)->a_version !=
1da177e4 LT	75	cpu_to_le32(REISERFS_ACL_VERSION))
	76	return ERR_PTR(-EINVAL);
	77	value = (char *)value + sizeof(reiserfs_acl_header);
	78	count = reiserfs_acl_count(size);
	79	if (count < 0)
	80	return ERR_PTR(-EINVAL);
	81	if (count == 0)
	82	return NULL;
	83	acl = posix_acl_alloc(count, GFP_NOFS);
	84	if (!acl)
	85	return ERR_PTR(-ENOMEM);
bd4c625c LT	86	for (n = 0; n < count; n++) {
bd4c625c LT	87	reiserfs_acl_entry entry = (reiserfs_acl_entry ) value;
1da177e4 LT	88	if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
1da177e4 LT	89	goto fail;
bd4c625c	90	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
1da177e4	91	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
bd4c625c LT	92	switch (acl->a_entries[n].e_tag) {
	93	case ACL_USER_OBJ:
	94	case ACL_GROUP_OBJ:
	95	case ACL_MASK:
	96	case ACL_OTHER:
	97	value = (char *)value +
	98	sizeof(reiserfs_acl_entry_short);
bd4c625c LT	99	break;
	100
	101	case ACL_USER:
df814654 EB	102	value = (char *)value + sizeof(reiserfs_acl_entry);
	103	if ((char *)value > end)
	104	goto fail;
	105	acl->a_entries[n].e_uid =
	106	make_kuid(&init_user_ns,
	107	le32_to_cpu(entry->e_id));
	108	break;
bd4c625c LT	109	case ACL_GROUP:
	110	value = (char *)value + sizeof(reiserfs_acl_entry);
	111	if ((char *)value > end)
1da177e4	112	goto fail;
df814654 EB	113	acl->a_entries[n].e_gid =
	114	make_kgid(&init_user_ns,
	115	le32_to_cpu(entry->e_id));
bd4c625c LT	116	break;
	117
	118	default:
	119	goto fail;
1da177e4 LT	120	}
	121	}
	122	if (value != end)
	123	goto fail;
	124	return acl;
	125
cf776a7a	126	fail:
1da177e4 LT	127	posix_acl_release(acl);
	128	return ERR_PTR(-EINVAL);
	129	}
	130
	131	/*
	132	* Convert from in-memory to filesystem representation.
	133	*/
9dad943a	134	static void reiserfs_posix_acl_to_disk(const struct posix_acl acl, size_t * size)
1da177e4 LT	135	{
	136	reiserfs_acl_header *ext_acl;
	137	char *e;
	138	int n;
	139
	140	*size = reiserfs_acl_size(acl->a_count);
5cbded58	141	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
bd4c625c LT	142	acl->a_count *
	143	sizeof(reiserfs_acl_entry),
	144	GFP_NOFS);
1da177e4 LT	145	if (!ext_acl)
	146	return ERR_PTR(-ENOMEM);
	147	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	148	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
bd4c625c	149	for (n = 0; n < acl->a_count; n++) {
df814654	150	const struct posix_acl_entry *acl_e = &acl->a_entries[n];
bd4c625c LT	151	reiserfs_acl_entry entry = (reiserfs_acl_entry ) e;
bd4c625c LT	152	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
1da177e4	153	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
bd4c625c LT	154	switch (acl->a_entries[n].e_tag) {
bd4c625c LT	155	case ACL_USER:
df814654 EB	156	entry->e_id = cpu_to_le32(
	157	from_kuid(&init_user_ns, acl_e->e_uid));
	158	e += sizeof(reiserfs_acl_entry);
	159	break;
bd4c625c	160	case ACL_GROUP:
df814654 EB	161	entry->e_id = cpu_to_le32(
df814654 EB	162	from_kgid(&init_user_ns, acl_e->e_gid));
bd4c625c LT	163	e += sizeof(reiserfs_acl_entry);
	164	break;
	165
	166	case ACL_USER_OBJ:
	167	case ACL_GROUP_OBJ:
	168	case ACL_MASK:
	169	case ACL_OTHER:
	170	e += sizeof(reiserfs_acl_entry_short);
	171	break;
	172
	173	default:
	174	goto fail;
1da177e4 LT	175	}
	176	}
	177	return (char *)ext_acl;
	178
cf776a7a	179	fail:
1da177e4 LT	180	kfree(ext_acl);
	181	return ERR_PTR(-EINVAL);
	182	}
	183
	184	/*
	185	* Inode operation get_posix_acl().
	186	*
1b1dcc1b	187	* inode->i_mutex: down
1da177e4 LT	188	* BKL held [before 2.5.x]
1da177e4 LT	189	*/
bd4c625c	190	struct posix_acl reiserfs_get_acl(struct inode inode, int type)
1da177e4 LT	191	{
1da177e4 LT	192	char name, value;
073aaa1b	193	struct posix_acl *acl;
3cdc409c	194	int size;
1da177e4	195	int retval;
bd4c625c LT	196
	197	switch (type) {
	198	case ACL_TYPE_ACCESS:
97d79299	199	name = XATTR_NAME_POSIX_ACL_ACCESS;
bd4c625c LT	200	break;
bd4c625c LT	201	case ACL_TYPE_DEFAULT:
97d79299	202	name = XATTR_NAME_POSIX_ACL_DEFAULT;
bd4c625c LT	203	break;
bd4c625c LT	204	default:
073aaa1b	205	BUG();
bd4c625c LT	206	}
bd4c625c LT	207
bd4c625c	208	size = reiserfs_xattr_get(inode, name, NULL, 0);
3cdc409c	209	if (size < 0) {
b8a7a3a6	210	if (size == -ENODATA \|\| size == -ENOSYS)
bd4c625c	211	return NULL;
bd4c625c LT	212	return ERR_PTR(size);
bd4c625c LT	213	}
1da177e4	214
bd4c625c LT	215	value = kmalloc(size, GFP_NOFS);
	216	if (!value)
	217	return ERR_PTR(-ENOMEM);
1da177e4 LT	218
	219	retval = reiserfs_xattr_get(inode, name, value, size);
	220	if (retval == -ENODATA \|\| retval == -ENOSYS) {
098297b2 JM	221	/*
	222	* This shouldn't actually happen as it should have
	223	* been caught above.. but just in case
	224	*/
1da177e4	225	acl = NULL;
bd4c625c	226	} else if (retval < 0) {
1da177e4 LT	227	acl = ERR_PTR(retval);
1da177e4 LT	228	} else {
9dad943a	229	acl = reiserfs_posix_acl_from_disk(value, retval);
bd4c625c	230	}
1da177e4 LT	231
	232	kfree(value);
	233	return acl;
	234	}
	235
	236	/*
	237	* Inode operation set_posix_acl().
	238	*
1b1dcc1b	239	* inode->i_mutex: down
1da177e4 LT	240	* BKL held [before 2.5.x]
	241	*/
	242	static int
47f70d08	243	__reiserfs_set_acl(struct reiserfs_transaction_handle th, struct inode inode,
0ab2621e	244	int type, struct posix_acl *acl)
1da177e4	245	{
bd4c625c	246	char *name;
1da177e4	247	void *value = NULL;
48b32a35	248	size_t size = 0;
1da177e4	249	int error;
1da177e4	250
bd4c625c LT	251	switch (type) {
bd4c625c LT	252	case ACL_TYPE_ACCESS:
97d79299	253	name = XATTR_NAME_POSIX_ACL_ACCESS;
bd4c625c LT	254	break;
bd4c625c LT	255	case ACL_TYPE_DEFAULT:
97d79299	256	name = XATTR_NAME_POSIX_ACL_DEFAULT;
bd4c625c LT	257	if (!S_ISDIR(inode->i_mode))
	258	return acl ? -EACCES : 0;
	259	break;
	260	default:
	261	return -EINVAL;
	262	}
	263
	264	if (acl) {
9dad943a	265	value = reiserfs_posix_acl_to_disk(acl, &size);
bd4c625c LT	266	if (IS_ERR(value))
bd4c625c LT	267	return (int)PTR_ERR(value);
48b32a35 JM	268	}
48b32a35 JM	269
0ab2621e	270	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);
48b32a35 JM	271
	272	/*
	273	* Ensure that the inode gets dirtied if we're only using
	274	* the mode bits and an old ACL didn't exist. We don't need
	275	* to check if the inode is hashed here since we won't get
	276	* called by reiserfs_inherit_default_acl().
	277	*/
	278	if (error == -ENODATA) {
	279	error = 0;
	280	if (type == ACL_TYPE_ACCESS) {
02027d42	281	inode->i_ctime = current_time(inode);
bd4c625c	282	mark_inode_dirty(inode);
bd4c625c LT	283	}
bd4c625c LT	284	}
1da177e4	285
833d304b	286	kfree(value);
1da177e4	287
d984561b	288	if (!error)
073aaa1b	289	set_cached_acl(inode, type, acl);
1da177e4 LT	290
	291	return error;
	292	}
	293
098297b2 JM	294	/*
	295	* dir->i_mutex: locked,
	296	* inode is new and not released into the wild yet
	297	*/
1da177e4	298	int
0ab2621e JM	299	reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	300	struct inode dir, struct dentry dentry,
bd4c625c	301	struct inode *inode)
1da177e4	302	{
47f70d08	303	struct posix_acl default_acl, acl;
bd4c625c LT	304	int err = 0;
	305
	306	/* ACLs only get applied to files and directories */
	307	if (S_ISLNK(inode->i_mode))
	308	return 0;
	309
098297b2 JM	310	/*
	311	* ACLs can only be used on "new" objects, so if it's an old object
	312	* there is nothing to inherit from
	313	*/
bd4c625c LT	314	if (get_inode_sd_version(dir) == STAT_DATA_V1)
	315	goto apply_umask;
	316
098297b2 JM	317	/*
098297b2 JM	318	* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
bd4c625c	319	* would be useless since permissions are ignored, and a pain because
098297b2 JM	320	* it introduces locking cycles
098297b2 JM	321	*/
6dfede69 JM	322	if (IS_PRIVATE(dir)) {
6dfede69 JM	323	inode->i_flags \|= S_PRIVATE;
bd4c625c LT	324	goto apply_umask;
	325	}
	326
47f70d08 CH	327	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	328	if (err)
	329	return err;
bd4c625c	330
47f70d08 CH	331	if (default_acl) {
	332	err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
	333	default_acl);
	334	posix_acl_release(default_acl);
	335	}
bd4c625c	336	if (acl) {
47f70d08 CH	337	if (!err)
	338	err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS,
	339	acl);
bd4c625c	340	posix_acl_release(acl);
bd4c625c LT	341	}
	342
	343	return err;
47f70d08	344
cf776a7a	345	apply_umask:
47f70d08 CH	346	/* no ACL, apply umask */
	347	inode->i_mode &= ~current_umask();
	348	return err;
1da177e4 LT	349	}
1da177e4 LT	350
0ab2621e JM	351	/* This is used to cache the default acl before a new object is created.
	352	* The biggest reason for this is to get an idea of how many blocks will
	353	* actually be required for the create operation if we must inherit an ACL.
	354	* An ACL write can add up to 3 object creations and an additional file write
	355	* so we'd prefer not to reserve that many blocks in the journal if we can.
	356	* It also has the advantage of not loading the ACL with a transaction open,
	357	* this may seem silly, but if the owner of the directory is doing the
	358	* creation, the ACL may not be loaded since the permissions wouldn't require
	359	* it.
	360	* We return the number of blocks required for the transaction.
	361	*/
bd4c625c	362	int reiserfs_cache_default_acl(struct inode *inode)
1da177e4	363	{
0ab2621e JM	364	struct posix_acl *acl;
	365	int nblocks = 0;
	366
	367	if (IS_PRIVATE(inode))
	368	return 0;
	369
7dffc87f	370	acl = get_acl(inode, ACL_TYPE_DEFAULT);
0ab2621e JM	371
	372	if (acl && !IS_ERR(acl)) {
	373	int size = reiserfs_acl_size(acl->a_count);
	374
	375	/* Other xattrs can be created during inode creation. We don't
	376	* want to claim too many blocks, so we check to see if we
	377	* we need to create the tree to the xattrs, and then we
	378	* just want two files. */
	379	nblocks = reiserfs_xattr_jcreate_nblocks(inode);
	380	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	381
	382	REISERFS_I(inode)->i_flags \|= i_has_xattr_dir;
	383
	384	/* We need to account for writes + bitmaps for two files */
	385	nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
	386	posix_acl_release(acl);
bd4c625c LT	387	}
bd4c625c LT	388
0ab2621e	389	return nblocks;
1da177e4 LT	390	}
1da177e4 LT	391
4c05141d JM	392	/*
	393	* Called under i_mutex
	394	*/
bd4c625c	395	int reiserfs_acl_chmod(struct inode *inode)
1da177e4	396	{
4a857011 JM	397	if (IS_PRIVATE(inode))
4a857011 JM	398	return 0;
bd4c625c	399	if (get_inode_sd_version(inode) == STAT_DATA_V1 \|\|
47f70d08	400	!reiserfs_posixacl(inode->i_sb))
bd4c625c	401	return 0;
1da177e4	402
47f70d08	403	return posix_acl_chmod(inode, inode->i_mode);
1da177e4	404	}