[deliverable/linux.git] / fs / reiserfs / xattr_acl.c

#include <linux/fs.h>
#include <linux/posix_acl.h>
#include <linux/reiserfs_fs.h>
#include <linux/errno.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include <linux/reiserfs_xattr.h>
#include <linux/reiserfs_acl.h>
#include <asm/uaccess.h>

static int reiserfs_set_acl(struct inode *inode, int type,
			    struct posix_acl *acl);

static int
xattr_set_acl(struct inode *inode, int type, const void *value, size_t size)
{
	struct posix_acl *acl;
	int error;

	if (!reiserfs_posixacl(inode->i_sb))
		return -EOPNOTSUPP;
	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
		return -EPERM;

	if (value) {
		acl = posix_acl_from_xattr(value, size);
		if (IS_ERR(acl)) {
			return PTR_ERR(acl);
		} else if (acl) {
			error = posix_acl_valid(acl);
			if (error)
				goto release_and_out;
		}
	} else
		acl = NULL;

	error = reiserfs_set_acl(inode, type, acl);

      release_and_out:
	posix_acl_release(acl);
	return error;
}

static int
xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)
{
	struct posix_acl *acl;
	int error;

	if (!reiserfs_posixacl(inode->i_sb))
		return -EOPNOTSUPP;

	acl = reiserfs_get_acl(inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl == NULL)
		return -ENODATA;
	error = posix_acl_to_xattr(acl, buffer, size);
	posix_acl_release(acl);

	return error;
}

/*
 * Convert from filesystem to in-memory representation.
 */
static struct posix_acl *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);
			acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
			break;

		case ACL_USER:
		case ACL_GROUP:
			value = (char *)value + sizeof(reiserfs_acl_entry);
			if ((char *)value > end)
				goto fail;
			acl->a_entries[n].e_id = 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 *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 = (reiserfs_acl_header *) 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++) {
		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:
		case ACL_GROUP:
			entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
			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_sem: 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, **p_acl;
	size_t size;
	int retval;
	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = POSIX_ACL_XATTR_ACCESS;
		p_acl = &reiserfs_i->i_acl_access;
		break;
	case ACL_TYPE_DEFAULT:
		name = POSIX_ACL_XATTR_DEFAULT;
		p_acl = &reiserfs_i->i_acl_default;
		break;
	default:
		return ERR_PTR(-EINVAL);
	}

	if (IS_ERR(*p_acl)) {
		if (PTR_ERR(*p_acl) == -ENODATA)
			return NULL;
	} else if (*p_acl != NULL)
		return posix_acl_dup(*p_acl);

	size = reiserfs_xattr_get(inode, name, NULL, 0);
	if ((int)size < 0) {
		if (size == -ENODATA || size == -ENOSYS) {
			*p_acl = ERR_PTR(-ENODATA);
			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;
		*p_acl = ERR_PTR(-ENODATA);
	} else if (retval < 0) {
		acl = ERR_PTR(retval);
	} else {
		acl = posix_acl_from_disk(value, retval);
		*p_acl = posix_acl_dup(acl);
	}

	kfree(value);
	return acl;
}

/*
 * Inode operation set_posix_acl().
 *
 * inode->i_sem: down
 * BKL held [before 2.5.x]
 */
static int
reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
	char *name;
	void *value = NULL;
	struct posix_acl **p_acl;
	size_t size;
	int error;
	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = POSIX_ACL_XATTR_ACCESS;
		p_acl = &reiserfs_i->i_acl_access;
		if (acl) {
			mode_t mode = inode->i_mode;
			error = posix_acl_equiv_mode(acl, &mode);
			if (error < 0)
				return error;
			else {
				inode->i_mode = mode;
				if (error == 0)
					acl = NULL;
			}
		}
		break;
	case ACL_TYPE_DEFAULT:
		name = POSIX_ACL_XATTR_DEFAULT;
		p_acl = &reiserfs_i->i_acl_default;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		value = posix_acl_to_disk(acl, &size);
		if (IS_ERR(value))
			return (int)PTR_ERR(value);
		error = reiserfs_xattr_set(inode, name, value, size, 0);
	} else {
		error = reiserfs_xattr_del(inode, name);
		if (error == -ENODATA) {
			/* This may seem odd here, but it means that the ACL was set
			 * with a value representable with mode bits. If there was
			 * an ACL before, reiserfs_xattr_del already dirtied the inode.
			 */
			mark_inode_dirty(inode);
			error = 0;
		}
	}

	if (value)
		kfree(value);

	if (!error) {
		/* Release the old one */
		if (!IS_ERR(*p_acl) && *p_acl)
			posix_acl_release(*p_acl);

		if (acl == NULL)
			*p_acl = ERR_PTR(-ENODATA);
		else
			*p_acl = posix_acl_dup(acl);
	}

	return error;
}

/* dir->i_sem: down,
 * inode is new and not released into the wild yet */
int
reiserfs_inherit_default_acl(struct inode *dir, struct dentry *dentry,
			     struct inode *inode)
{
	struct posix_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_reiserfs_priv_object(dir)) {
		reiserfs_mark_inode_private(inode);
		goto apply_umask;
	}

	acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
	if (IS_ERR(acl)) {
		if (PTR_ERR(acl) == -ENODATA)
			goto apply_umask;
		return PTR_ERR(acl);
	}

	if (acl) {
		struct posix_acl *acl_copy;
		mode_t mode = inode->i_mode;
		int need_acl;

		/* Copy the default ACL to the default ACL of a new directory */
		if (S_ISDIR(inode->i_mode)) {
			err = reiserfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
			if (err)
				goto cleanup;
		}

		/* Now we reconcile the new ACL and the mode,
		   potentially modifying both */
		acl_copy = posix_acl_clone(acl, GFP_NOFS);
		if (!acl_copy) {
			err = -ENOMEM;
			goto cleanup;
		}

		need_acl = posix_acl_create_masq(acl_copy, &mode);
		if (need_acl >= 0) {
			if (mode != inode->i_mode) {
				inode->i_mode = mode;
			}

			/* If we need an ACL.. */
			if (need_acl > 0) {
				err =
				    reiserfs_set_acl(inode, ACL_TYPE_ACCESS,
						     acl_copy);
				if (err)
					goto cleanup_copy;
			}
		}
	      cleanup_copy:
		posix_acl_release(acl_copy);
	      cleanup:
		posix_acl_release(acl);
	} else {
	      apply_umask:
		/* no ACL, apply umask */
		inode->i_mode &= ~current->fs->umask;
	}

	return err;
}

/* Looks up and caches the result of the default ACL.
 * We do this so that we don't need to carry the xattr_sem into
 * reiserfs_new_inode if we don't need to */
int reiserfs_cache_default_acl(struct inode *inode)
{
	int ret = 0;
	if (reiserfs_posixacl(inode->i_sb) && !is_reiserfs_priv_object(inode)) {
		struct posix_acl *acl;
		reiserfs_read_lock_xattr_i(inode);
		reiserfs_read_lock_xattrs(inode->i_sb);
		acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
		reiserfs_read_unlock_xattrs(inode->i_sb);
		reiserfs_read_unlock_xattr_i(inode);
		ret = acl ? 1 : 0;
		posix_acl_release(acl);
	}

	return ret;
}

int reiserfs_acl_chmod(struct inode *inode)
{
	struct posix_acl *acl, *clone;
	int error;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	if (get_inode_sd_version(inode) == STAT_DATA_V1 ||
	    !reiserfs_posixacl(inode->i_sb)) {
		return 0;
	}

	reiserfs_read_lock_xattrs(inode->i_sb);
	acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
	reiserfs_read_unlock_xattrs(inode->i_sb);
	if (!acl)
		return 0;
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	clone = posix_acl_clone(acl, GFP_NOFS);
	posix_acl_release(acl);
	if (!clone)
		return -ENOMEM;
	error = posix_acl_chmod_masq(clone, inode->i_mode);
	if (!error) {
		int lock = !has_xattr_dir(inode);
		reiserfs_write_lock_xattr_i(inode);
		if (lock)
			reiserfs_write_lock_xattrs(inode->i_sb);
		else
			reiserfs_read_lock_xattrs(inode->i_sb);
		error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
		if (lock)
			reiserfs_write_unlock_xattrs(inode->i_sb);
		else
			reiserfs_read_unlock_xattrs(inode->i_sb);
		reiserfs_write_unlock_xattr_i(inode);
	}
	posix_acl_release(clone);
	return error;
}

static int
posix_acl_access_get(struct inode *inode, const char *name,
		     void *buffer, size_t size)
{
	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
		return -EINVAL;
	return xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
}

static int
posix_acl_access_set(struct inode *inode, const char *name,
		     const void *value, size_t size, int flags)
{
	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
		return -EINVAL;
	return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
}

static int posix_acl_access_del(struct inode *inode, const char *name)
{
	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
	struct posix_acl **acl = &reiserfs_i->i_acl_access;
	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
		return -EINVAL;
	if (!IS_ERR(*acl) && *acl) {
		posix_acl_release(*acl);
		*acl = ERR_PTR(-ENODATA);
	}

	return 0;
}

static int
posix_acl_access_list(struct inode *inode, const char *name, int namelen,
		      char *out)
{
	int len = namelen;
	if (!reiserfs_posixacl(inode->i_sb))
		return 0;
	if (out)
		memcpy(out, name, len);

	return len;
}

struct reiserfs_xattr_handler posix_acl_access_handler = {
	.prefix = POSIX_ACL_XATTR_ACCESS,
	.get = posix_acl_access_get,
	.set = posix_acl_access_set,
	.del = posix_acl_access_del,
	.list = posix_acl_access_list,
};

static int
posix_acl_default_get(struct inode *inode, const char *name,
		      void *buffer, size_t size)
{
	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
		return -EINVAL;
	return xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
}

static int
posix_acl_default_set(struct inode *inode, const char *name,
		      const void *value, size_t size, int flags)
{
	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
		return -EINVAL;
	return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
}

static int posix_acl_default_del(struct inode *inode, const char *name)
{
	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
	struct posix_acl **acl = &reiserfs_i->i_acl_default;
	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
		return -EINVAL;
	if (!IS_ERR(*acl) && *acl) {
		posix_acl_release(*acl);
		*acl = ERR_PTR(-ENODATA);
	}

	return 0;
}

static int
posix_acl_default_list(struct inode *inode, const char *name, int namelen,
		       char *out)
{
	int len = namelen;
	if (!reiserfs_posixacl(inode->i_sb))
		return 0;
	if (out)
		memcpy(out, name, len);

	return len;
}

struct reiserfs_xattr_handler posix_acl_default_handler = {
	.prefix = POSIX_ACL_XATTR_DEFAULT,
	.get = posix_acl_default_get,
	.set = posix_acl_default_set,
	.del = posix_acl_default_del,
	.list = posix_acl_default_list,
};
Commit	Line	Data
1da177e4 LT	1	#include <linux/fs.h>
	2	#include <linux/posix_acl.h>
	3	#include <linux/reiserfs_fs.h>
	4	#include <linux/errno.h>
	5	#include <linux/pagemap.h>
	6	#include <linux/xattr.h>
9a59f452	7	#include <linux/posix_acl_xattr.h>
1da177e4 LT	8	#include <linux/reiserfs_xattr.h>
	9	#include <linux/reiserfs_acl.h>
	10	#include <asm/uaccess.h>
	11
bd4c625c LT	12	static int reiserfs_set_acl(struct inode *inode, int type,
bd4c625c LT	13	struct posix_acl *acl);
1da177e4 LT	14
	15	static int
	16	xattr_set_acl(struct inode inode, int type, const void value, size_t size)
	17	{
	18	struct posix_acl *acl;
	19	int error;
	20
	21	if (!reiserfs_posixacl(inode->i_sb))
	22	return -EOPNOTSUPP;
	23	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
	24	return -EPERM;
	25
	26	if (value) {
	27	acl = posix_acl_from_xattr(value, size);
	28	if (IS_ERR(acl)) {
	29	return PTR_ERR(acl);
	30	} else if (acl) {
	31	error = posix_acl_valid(acl);
	32	if (error)
	33	goto release_and_out;
	34	}
	35	} else
	36	acl = NULL;
	37
bd4c625c	38	error = reiserfs_set_acl(inode, type, acl);
1da177e4	39
bd4c625c	40	release_and_out:
1da177e4 LT	41	posix_acl_release(acl);
	42	return error;
	43	}
	44
1da177e4 LT	45	static int
	46	xattr_get_acl(struct inode inode, int type, void buffer, size_t size)
	47	{
	48	struct posix_acl *acl;
	49	int error;
	50
	51	if (!reiserfs_posixacl(inode->i_sb))
	52	return -EOPNOTSUPP;
	53
bd4c625c	54	acl = reiserfs_get_acl(inode, type);
1da177e4 LT	55	if (IS_ERR(acl))
	56	return PTR_ERR(acl);
	57	if (acl == NULL)
	58	return -ENODATA;
	59	error = posix_acl_to_xattr(acl, buffer, size);
	60	posix_acl_release(acl);
	61
	62	return error;
	63	}
	64
1da177e4 LT	65	/*
	66	* Convert from filesystem to in-memory representation.
	67	*/
bd4c625c	68	static struct posix_acl posix_acl_from_disk(const void value, size_t size)
1da177e4 LT	69	{
	70	const char end = (char )value + size;
	71	int n, count;
	72	struct posix_acl *acl;
	73
	74	if (!value)
	75	return NULL;
	76	if (size < sizeof(reiserfs_acl_header))
bd4c625c LT	77	return ERR_PTR(-EINVAL);
bd4c625c LT	78	if (((reiserfs_acl_header *) value)->a_version !=
1da177e4 LT	79	cpu_to_le32(REISERFS_ACL_VERSION))
	80	return ERR_PTR(-EINVAL);
	81	value = (char *)value + sizeof(reiserfs_acl_header);
	82	count = reiserfs_acl_count(size);
	83	if (count < 0)
	84	return ERR_PTR(-EINVAL);
	85	if (count == 0)
	86	return NULL;
	87	acl = posix_acl_alloc(count, GFP_NOFS);
	88	if (!acl)
	89	return ERR_PTR(-ENOMEM);
bd4c625c LT	90	for (n = 0; n < count; n++) {
bd4c625c LT	91	reiserfs_acl_entry entry = (reiserfs_acl_entry ) value;
1da177e4 LT	92	if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
1da177e4 LT	93	goto fail;
bd4c625c	94	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
1da177e4	95	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
bd4c625c LT	96	switch (acl->a_entries[n].e_tag) {
	97	case ACL_USER_OBJ:
	98	case ACL_GROUP_OBJ:
	99	case ACL_MASK:
	100	case ACL_OTHER:
	101	value = (char *)value +
	102	sizeof(reiserfs_acl_entry_short);
	103	acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
	104	break;
	105
	106	case ACL_USER:
	107	case ACL_GROUP:
	108	value = (char *)value + sizeof(reiserfs_acl_entry);
	109	if ((char *)value > end)
1da177e4	110	goto fail;
bd4c625c LT	111	acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
	112	break;
	113
	114	default:
	115	goto fail;
1da177e4 LT	116	}
	117	}
	118	if (value != end)
	119	goto fail;
	120	return acl;
	121
bd4c625c	122	fail:
1da177e4 LT	123	posix_acl_release(acl);
	124	return ERR_PTR(-EINVAL);
	125	}
	126
	127	/*
	128	* Convert from in-memory to filesystem representation.
	129	*/
bd4c625c	130	static void posix_acl_to_disk(const struct posix_acl acl, size_t * size)
1da177e4 LT	131	{
	132	reiserfs_acl_header *ext_acl;
	133	char *e;
	134	int n;
	135
	136	*size = reiserfs_acl_size(acl->a_count);
bd4c625c LT	137	ext_acl = (reiserfs_acl_header *) kmalloc(sizeof(reiserfs_acl_header) +
	138	acl->a_count *
	139	sizeof(reiserfs_acl_entry),
	140	GFP_NOFS);
1da177e4 LT	141	if (!ext_acl)
	142	return ERR_PTR(-ENOMEM);
	143	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	144	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
bd4c625c LT	145	for (n = 0; n < acl->a_count; n++) {
	146	reiserfs_acl_entry entry = (reiserfs_acl_entry ) e;
	147	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
1da177e4	148	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
bd4c625c LT	149	switch (acl->a_entries[n].e_tag) {
	150	case ACL_USER:
	151	case ACL_GROUP:
	152	entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
	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
bd4c625c	169	fail:
1da177e4 LT	170	kfree(ext_acl);
	171	return ERR_PTR(-EINVAL);
	172	}
	173
	174	/*
	175	* Inode operation get_posix_acl().
	176	*
	177	* inode->i_sem: down
	178	* BKL held [before 2.5.x]
	179	*/
bd4c625c	180	struct posix_acl reiserfs_get_acl(struct inode inode, int type)
1da177e4 LT	181	{
	182	char name, value;
	183	struct posix_acl acl, *p_acl;
	184	size_t size;
	185	int retval;
bd4c625c LT	186	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
	187
	188	switch (type) {
	189	case ACL_TYPE_ACCESS:
	190	name = POSIX_ACL_XATTR_ACCESS;
	191	p_acl = &reiserfs_i->i_acl_access;
	192	break;
	193	case ACL_TYPE_DEFAULT:
	194	name = POSIX_ACL_XATTR_DEFAULT;
	195	p_acl = &reiserfs_i->i_acl_default;
	196	break;
	197	default:
	198	return ERR_PTR(-EINVAL);
	199	}
	200
	201	if (IS_ERR(*p_acl)) {
	202	if (PTR_ERR(*p_acl) == -ENODATA)
	203	return NULL;
	204	} else if (*p_acl != NULL)
	205	return posix_acl_dup(*p_acl);
	206
	207	size = reiserfs_xattr_get(inode, name, NULL, 0);
	208	if ((int)size < 0) {
	209	if (size == -ENODATA \|\| size == -ENOSYS) {
	210	*p_acl = ERR_PTR(-ENODATA);
	211	return NULL;
	212	}
	213	return ERR_PTR(size);
	214	}
1da177e4	215
bd4c625c LT	216	value = kmalloc(size, GFP_NOFS);
	217	if (!value)
	218	return ERR_PTR(-ENOMEM);
1da177e4 LT	219
	220	retval = reiserfs_xattr_get(inode, name, value, size);
	221	if (retval == -ENODATA \|\| retval == -ENOSYS) {
	222	/* This shouldn't actually happen as it should have
	223	been caught above.. but just in case */
	224	acl = NULL;
bd4c625c LT	225	*p_acl = ERR_PTR(-ENODATA);
bd4c625c LT	226	} else if (retval < 0) {
1da177e4 LT	227	acl = ERR_PTR(retval);
	228	} else {
	229	acl = posix_acl_from_disk(value, retval);
bd4c625c LT	230	*p_acl = posix_acl_dup(acl);
bd4c625c LT	231	}
1da177e4 LT	232
	233	kfree(value);
	234	return acl;
	235	}
	236
	237	/*
	238	* Inode operation set_posix_acl().
	239	*
	240	* inode->i_sem: down
	241	* BKL held [before 2.5.x]
	242	*/
	243	static int
	244	reiserfs_set_acl(struct inode inode, int type, struct posix_acl acl)
	245	{
bd4c625c	246	char *name;
1da177e4 LT	247	void *value = NULL;
	248	struct posix_acl **p_acl;
	249	size_t size;
	250	int error;
bd4c625c	251	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
1da177e4 LT	252
	253	if (S_ISLNK(inode->i_mode))
	254	return -EOPNOTSUPP;
	255
bd4c625c LT	256	switch (type) {
	257	case ACL_TYPE_ACCESS:
	258	name = POSIX_ACL_XATTR_ACCESS;
	259	p_acl = &reiserfs_i->i_acl_access;
	260	if (acl) {
	261	mode_t mode = inode->i_mode;
	262	error = posix_acl_equiv_mode(acl, &mode);
	263	if (error < 0)
	264	return error;
	265	else {
	266	inode->i_mode = mode;
	267	if (error == 0)
	268	acl = NULL;
	269	}
	270	}
	271	break;
	272	case ACL_TYPE_DEFAULT:
	273	name = POSIX_ACL_XATTR_DEFAULT;
	274	p_acl = &reiserfs_i->i_acl_default;
	275	if (!S_ISDIR(inode->i_mode))
	276	return acl ? -EACCES : 0;
	277	break;
	278	default:
	279	return -EINVAL;
	280	}
	281
	282	if (acl) {
	283	value = posix_acl_to_disk(acl, &size);
	284	if (IS_ERR(value))
	285	return (int)PTR_ERR(value);
	286	error = reiserfs_xattr_set(inode, name, value, size, 0);
1da177e4	287	} else {
bd4c625c LT	288	error = reiserfs_xattr_del(inode, name);
	289	if (error == -ENODATA) {
	290	/* This may seem odd here, but it means that the ACL was set
	291	* with a value representable with mode bits. If there was
	292	* an ACL before, reiserfs_xattr_del already dirtied the inode.
	293	*/
	294	mark_inode_dirty(inode);
	295	error = 0;
	296	}
	297	}
1da177e4 LT	298
	299	if (value)
	300	kfree(value);
	301
bd4c625c LT	302	if (!error) {
	303	/* Release the old one */
	304	if (!IS_ERR(p_acl) && p_acl)
	305	posix_acl_release(*p_acl);
1da177e4	306
bd4c625c LT	307	if (acl == NULL)
	308	*p_acl = ERR_PTR(-ENODATA);
	309	else
	310	*p_acl = posix_acl_dup(acl);
	311	}
1da177e4 LT	312
	313	return error;
	314	}
	315
	316	/* dir->i_sem: down,
	317	* inode is new and not released into the wild yet */
	318	int
bd4c625c LT	319	reiserfs_inherit_default_acl(struct inode dir, struct dentry dentry,
bd4c625c LT	320	struct inode *inode)
1da177e4	321	{
bd4c625c LT	322	struct posix_acl *acl;
	323	int err = 0;
	324
	325	/* ACLs only get applied to files and directories */
	326	if (S_ISLNK(inode->i_mode))
	327	return 0;
	328
	329	/* ACLs can only be used on "new" objects, so if it's an old object
	330	* there is nothing to inherit from */
	331	if (get_inode_sd_version(dir) == STAT_DATA_V1)
	332	goto apply_umask;
	333
	334	/* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
	335	* would be useless since permissions are ignored, and a pain because
	336	* it introduces locking cycles */
	337	if (is_reiserfs_priv_object(dir)) {
	338	reiserfs_mark_inode_private(inode);
	339	goto apply_umask;
	340	}
	341
	342	acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
	343	if (IS_ERR(acl)) {
	344	if (PTR_ERR(acl) == -ENODATA)
	345	goto apply_umask;
	346	return PTR_ERR(acl);
	347	}
	348
	349	if (acl) {
	350	struct posix_acl *acl_copy;
	351	mode_t mode = inode->i_mode;
	352	int need_acl;
	353
	354	/* Copy the default ACL to the default ACL of a new directory */
	355	if (S_ISDIR(inode->i_mode)) {
	356	err = reiserfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
	357	if (err)
	358	goto cleanup;
	359	}
	360
	361	/* Now we reconcile the new ACL and the mode,
	362	potentially modifying both */
	363	acl_copy = posix_acl_clone(acl, GFP_NOFS);
	364	if (!acl_copy) {
	365	err = -ENOMEM;
	366	goto cleanup;
	367	}
	368
	369	need_acl = posix_acl_create_masq(acl_copy, &mode);
	370	if (need_acl >= 0) {
	371	if (mode != inode->i_mode) {
	372	inode->i_mode = mode;
	373	}
	374
	375	/* If we need an ACL.. */
	376	if (need_acl > 0) {
	377	err =
	378	reiserfs_set_acl(inode, ACL_TYPE_ACCESS,
	379	acl_copy);
	380	if (err)
	381	goto cleanup_copy;
	382	}
	383	}
	384	cleanup_copy:
	385	posix_acl_release(acl_copy);
386	cleanup:
387	posix_acl_release(acl);
388	} else {
389	apply_umask:
390	/* no ACL, apply umask */
391	inode->i_mode &= ~current->fs->umask;
392	}
393
394	return err;
1da177e4 LT	395	}
	396
	397	/* Looks up and caches the result of the default ACL.
	398	* We do this so that we don't need to carry the xattr_sem into
	399	* reiserfs_new_inode if we don't need to */
bd4c625c	400	int reiserfs_cache_default_acl(struct inode *inode)
1da177e4	401	{
bd4c625c LT	402	int ret = 0;
	403	if (reiserfs_posixacl(inode->i_sb) && !is_reiserfs_priv_object(inode)) {
	404	struct posix_acl *acl;
	405	reiserfs_read_lock_xattr_i(inode);
	406	reiserfs_read_lock_xattrs(inode->i_sb);
	407	acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
	408	reiserfs_read_unlock_xattrs(inode->i_sb);
	409	reiserfs_read_unlock_xattr_i(inode);
	410	ret = acl ? 1 : 0;
	411	posix_acl_release(acl);
	412	}
	413
	414	return ret;
1da177e4 LT	415	}
1da177e4 LT	416
bd4c625c	417	int reiserfs_acl_chmod(struct inode *inode)
1da177e4	418	{
bd4c625c LT	419	struct posix_acl acl, clone;
bd4c625c LT	420	int error;
1da177e4	421
bd4c625c LT	422	if (S_ISLNK(inode->i_mode))
bd4c625c LT	423	return -EOPNOTSUPP;
1da177e4	424
bd4c625c LT	425	if (get_inode_sd_version(inode) == STAT_DATA_V1 \|\|
	426	!reiserfs_posixacl(inode->i_sb)) {
	427	return 0;
1da177e4 LT	428	}
1da177e4 LT	429
bd4c625c LT	430	reiserfs_read_lock_xattrs(inode->i_sb);
	431	acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
	432	reiserfs_read_unlock_xattrs(inode->i_sb);
	433	if (!acl)
	434	return 0;
	435	if (IS_ERR(acl))
	436	return PTR_ERR(acl);
	437	clone = posix_acl_clone(acl, GFP_NOFS);
	438	posix_acl_release(acl);
	439	if (!clone)
	440	return -ENOMEM;
	441	error = posix_acl_chmod_masq(clone, inode->i_mode);
	442	if (!error) {
	443	int lock = !has_xattr_dir(inode);
	444	reiserfs_write_lock_xattr_i(inode);
	445	if (lock)
	446	reiserfs_write_lock_xattrs(inode->i_sb);
	447	else
	448	reiserfs_read_lock_xattrs(inode->i_sb);
	449	error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
	450	if (lock)
	451	reiserfs_write_unlock_xattrs(inode->i_sb);
	452	else
	453	reiserfs_read_unlock_xattrs(inode->i_sb);
	454	reiserfs_write_unlock_xattr_i(inode);
	455	}
	456	posix_acl_release(clone);
	457	return error;
1da177e4 LT	458	}
	459
	460	static int
	461	posix_acl_access_get(struct inode inode, const char name,
bd4c625c	462	void *buffer, size_t size)
1da177e4	463	{
bd4c625c	464	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
1da177e4 LT	465	return -EINVAL;
	466	return xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
	467	}
	468
	469	static int
	470	posix_acl_access_set(struct inode inode, const char name,
bd4c625c	471	const void *value, size_t size, int flags)
1da177e4	472	{
bd4c625c	473	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
1da177e4 LT	474	return -EINVAL;
	475	return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
	476	}
	477
bd4c625c	478	static int posix_acl_access_del(struct inode inode, const char name)
1da177e4	479	{
bd4c625c LT	480	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
	481	struct posix_acl **acl = &reiserfs_i->i_acl_access;
	482	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
	483	return -EINVAL;
	484	if (!IS_ERR(acl) && acl) {
	485	posix_acl_release(*acl);
	486	*acl = ERR_PTR(-ENODATA);
	487	}
	488
	489	return 0;
1da177e4 LT	490	}
	491
	492	static int
bd4c625c LT	493	posix_acl_access_list(struct inode inode, const char name, int namelen,
bd4c625c LT	494	char *out)
1da177e4	495	{
bd4c625c LT	496	int len = namelen;
	497	if (!reiserfs_posixacl(inode->i_sb))
	498	return 0;
	499	if (out)
	500	memcpy(out, name, len);
1da177e4	501
bd4c625c	502	return len;
1da177e4 LT	503	}
	504
	505	struct reiserfs_xattr_handler posix_acl_access_handler = {
9a59f452	506	.prefix = POSIX_ACL_XATTR_ACCESS,
1da177e4 LT	507	.get = posix_acl_access_get,
	508	.set = posix_acl_access_set,
	509	.del = posix_acl_access_del,
	510	.list = posix_acl_access_list,
	511	};
	512
	513	static int
bd4c625c LT	514	posix_acl_default_get(struct inode inode, const char name,
bd4c625c LT	515	void *buffer, size_t size)
1da177e4	516	{
bd4c625c	517	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
1da177e4 LT	518	return -EINVAL;
	519	return xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
	520	}
	521
	522	static int
	523	posix_acl_default_set(struct inode inode, const char name,
bd4c625c	524	const void *value, size_t size, int flags)
1da177e4	525	{
bd4c625c	526	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
1da177e4 LT	527	return -EINVAL;
	528	return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
	529	}
	530
bd4c625c	531	static int posix_acl_default_del(struct inode inode, const char name)
1da177e4	532	{
bd4c625c LT	533	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
	534	struct posix_acl **acl = &reiserfs_i->i_acl_default;
	535	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
	536	return -EINVAL;
	537	if (!IS_ERR(acl) && acl) {
	538	posix_acl_release(*acl);
	539	*acl = ERR_PTR(-ENODATA);
	540	}
	541
	542	return 0;
1da177e4 LT	543	}
	544
	545	static int
bd4c625c LT	546	posix_acl_default_list(struct inode inode, const char name, int namelen,
bd4c625c LT	547	char *out)
1da177e4	548	{
bd4c625c LT	549	int len = namelen;
	550	if (!reiserfs_posixacl(inode->i_sb))
	551	return 0;
	552	if (out)
	553	memcpy(out, name, len);
1da177e4	554
bd4c625c	555	return len;
1da177e4 LT	556	}
	557
	558	struct reiserfs_xattr_handler posix_acl_default_handler = {
9a59f452	559	.prefix = POSIX_ACL_XATTR_DEFAULT,
1da177e4 LT	560	.get = posix_acl_default_get,
	561	.set = posix_acl_default_set,
	562	.del = posix_acl_default_del,
	563	.list = posix_acl_default_list,
	564	};