[net-next-2.6.git] / fs / reiserfs / xattr_acl.c

#include <linux/capability.h>
#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 reiserfs_transaction_handle *th,
			    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, error2;
	struct reiserfs_transaction_handle th;
	size_t jcreate_blocks;
	if (!reiserfs_posixacl(inode->i_sb))
		return -EOPNOTSUPP;
	if (!is_owner_or_cap(inode))
		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;

	/* 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);
	if (error == 0) {
		error = reiserfs_set_acl(&th, inode, type, acl);
		error2 = journal_end(&th, inode->i_sb, jcreate_blocks);
		if (error2)
			error = error2;
	}
	reiserfs_write_unlock(inode->i_sb);

      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 = 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);
}

static inline void iset_acl(struct inode *inode, struct posix_acl **i_acl,
			    struct posix_acl *acl)
{
	spin_lock(&inode->i_lock);
	if (*i_acl != ERR_PTR(-ENODATA))
		posix_acl_release(*i_acl);
	*i_acl = acl ? posix_acl_dup(acl) : ERR_PTR(-ENODATA);
	spin_unlock(&inode->i_lock);
}

static inline struct posix_acl *iget_acl(struct inode *inode,
					 struct posix_acl **i_acl)
{
	struct posix_acl *acl = ERR_PTR(-ENODATA);

	spin_lock(&inode->i_lock);
	if (*i_acl != ERR_PTR(-ENODATA))
		acl = posix_acl_dup(*i_acl);
	spin_unlock(&inode->i_lock);

	return acl;
}

/*
 * 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, **p_acl;
	int 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);
	}

	acl = iget_acl(inode, p_acl);
	if (acl && !IS_ERR(acl))
		return acl;
	else if (PTR_ERR(acl) == -ENODATA)
		return NULL;

	size = reiserfs_xattr_get(inode, name, NULL, 0);
	if (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);
		if (!IS_ERR(acl))
			iset_acl(inode, p_acl, acl);
	}

	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;
	struct posix_acl **p_acl;
	size_t size = 0;
	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_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)
		iset_acl(inode, p_acl, 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 *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;
	}

	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(th, 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(th, 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_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 = reiserfs_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;
}

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;
	}

	acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
	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) {
		struct reiserfs_transaction_handle th;
		size_t size = reiserfs_xattr_nblocks(inode,
					     reiserfs_acl_size(clone->a_count));
		reiserfs_write_lock(inode->i_sb);
		error = journal_begin(&th, inode->i_sb, size * 2);
		if (!error) {
			int error2;
			error = reiserfs_set_acl(&th, inode, ACL_TYPE_ACCESS,
						 clone);
			error2 = journal_end(&th, inode->i_sb, size * 2);
			if (error2)
				error = error2;
		}
		reiserfs_write_unlock(inode->i_sb);
	}
	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 size_t posix_acl_access_list(struct inode *inode, char *list,
				    size_t list_size, const char *name,
				    size_t name_len)
{
	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
	if (!reiserfs_posixacl(inode->i_sb))
		return 0;
	if (list && size <= list_size)
		memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	return size;
}

struct xattr_handler reiserfs_posix_acl_access_handler = {
	.prefix = POSIX_ACL_XATTR_ACCESS,
	.get = posix_acl_access_get,
	.set = posix_acl_access_set,
	.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 size_t posix_acl_default_list(struct inode *inode, char *list,
				     size_t list_size, const char *name,
				     size_t name_len)
{
	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
	if (!reiserfs_posixacl(inode->i_sb))
		return 0;
	if (list && size <= list_size)
		memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	return size;
}

struct xattr_handler reiserfs_posix_acl_default_handler = {
	.prefix = POSIX_ACL_XATTR_DEFAULT,
	.get = posix_acl_default_get,
	.set = posix_acl_default_set,
	.list = posix_acl_default_list,
};
Commit	Line	Data
16f7e0fe	1	#include <linux/capability.h>
1da177e4 LT	2	#include <linux/fs.h>
	3	#include <linux/posix_acl.h>
	4	#include <linux/reiserfs_fs.h>
	5	#include <linux/errno.h>
	6	#include <linux/pagemap.h>
	7	#include <linux/xattr.h>
9a59f452	8	#include <linux/posix_acl_xattr.h>
1da177e4 LT	9	#include <linux/reiserfs_xattr.h>
	10	#include <linux/reiserfs_acl.h>
	11	#include <asm/uaccess.h>
	12
0ab2621e JM	13	static int reiserfs_set_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	14	struct inode *inode, int type,
bd4c625c	15	struct posix_acl *acl);
1da177e4 LT	16
	17	static int
	18	xattr_set_acl(struct inode inode, int type, const void value, size_t size)
	19	{
	20	struct posix_acl *acl;
0ab2621e JM	21	int error, error2;
	22	struct reiserfs_transaction_handle th;
	23	size_t jcreate_blocks;
1da177e4 LT	24	if (!reiserfs_posixacl(inode->i_sb))
1da177e4 LT	25	return -EOPNOTSUPP;
3bd858ab	26	if (!is_owner_or_cap(inode))
1da177e4 LT	27	return -EPERM;
	28
	29	if (value) {
	30	acl = posix_acl_from_xattr(value, size);
	31	if (IS_ERR(acl)) {
	32	return PTR_ERR(acl);
	33	} else if (acl) {
	34	error = posix_acl_valid(acl);
	35	if (error)
	36	goto release_and_out;
	37	}
	38	} else
	39	acl = NULL;
	40
0ab2621e JM	41	/* Pessimism: We can't assume that anything from the xattr root up
	42	* has been created. */
	43
	44	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
	45	reiserfs_xattr_nblocks(inode, size) * 2;
	46
	47	reiserfs_write_lock(inode->i_sb);
	48	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
	49	if (error == 0) {
	50	error = reiserfs_set_acl(&th, inode, type, acl);
	51	error2 = journal_end(&th, inode->i_sb, jcreate_blocks);
	52	if (error2)
	53	error = error2;
	54	}
	55	reiserfs_write_unlock(inode->i_sb);
1da177e4	56
bd4c625c	57	release_and_out:
1da177e4 LT	58	posix_acl_release(acl);
	59	return error;
	60	}
	61
1da177e4 LT	62	static int
	63	xattr_get_acl(struct inode inode, int type, void buffer, size_t size)
	64	{
	65	struct posix_acl *acl;
	66	int error;
	67
	68	if (!reiserfs_posixacl(inode->i_sb))
	69	return -EOPNOTSUPP;
	70
bd4c625c	71	acl = reiserfs_get_acl(inode, type);
1da177e4 LT	72	if (IS_ERR(acl))
	73	return PTR_ERR(acl);
	74	if (acl == NULL)
	75	return -ENODATA;
	76	error = posix_acl_to_xattr(acl, buffer, size);
	77	posix_acl_release(acl);
	78
	79	return error;
	80	}
	81
1da177e4 LT	82	/*
	83	* Convert from filesystem to in-memory representation.
	84	*/
bd4c625c	85	static struct posix_acl posix_acl_from_disk(const void value, size_t size)
1da177e4 LT	86	{
	87	const char end = (char )value + size;
	88	int n, count;
	89	struct posix_acl *acl;
	90
	91	if (!value)
	92	return NULL;
	93	if (size < sizeof(reiserfs_acl_header))
bd4c625c LT	94	return ERR_PTR(-EINVAL);
bd4c625c LT	95	if (((reiserfs_acl_header *) value)->a_version !=
1da177e4 LT	96	cpu_to_le32(REISERFS_ACL_VERSION))
	97	return ERR_PTR(-EINVAL);
	98	value = (char *)value + sizeof(reiserfs_acl_header);
	99	count = reiserfs_acl_count(size);
	100	if (count < 0)
	101	return ERR_PTR(-EINVAL);
	102	if (count == 0)
	103	return NULL;
	104	acl = posix_acl_alloc(count, GFP_NOFS);
	105	if (!acl)
	106	return ERR_PTR(-ENOMEM);
bd4c625c LT	107	for (n = 0; n < count; n++) {
bd4c625c LT	108	reiserfs_acl_entry entry = (reiserfs_acl_entry ) value;
1da177e4 LT	109	if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
1da177e4 LT	110	goto fail;
bd4c625c	111	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
1da177e4	112	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
bd4c625c LT	113	switch (acl->a_entries[n].e_tag) {
	114	case ACL_USER_OBJ:
	115	case ACL_GROUP_OBJ:
	116	case ACL_MASK:
	117	case ACL_OTHER:
	118	value = (char *)value +
	119	sizeof(reiserfs_acl_entry_short);
	120	acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
	121	break;
	122
	123	case ACL_USER:
	124	case ACL_GROUP:
	125	value = (char *)value + sizeof(reiserfs_acl_entry);
	126	if ((char *)value > end)
1da177e4	127	goto fail;
bd4c625c LT	128	acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
	129	break;
	130
	131	default:
	132	goto fail;
1da177e4 LT	133	}
	134	}
	135	if (value != end)
	136	goto fail;
	137	return acl;
	138
bd4c625c	139	fail:
1da177e4 LT	140	posix_acl_release(acl);
	141	return ERR_PTR(-EINVAL);
	142	}
	143
	144	/*
	145	* Convert from in-memory to filesystem representation.
	146	*/
bd4c625c	147	static void posix_acl_to_disk(const struct posix_acl acl, size_t * size)
1da177e4 LT	148	{
	149	reiserfs_acl_header *ext_acl;
	150	char *e;
	151	int n;
	152
	153	*size = reiserfs_acl_size(acl->a_count);
5cbded58	154	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
bd4c625c LT	155	acl->a_count *
	156	sizeof(reiserfs_acl_entry),
	157	GFP_NOFS);
1da177e4 LT	158	if (!ext_acl)
	159	return ERR_PTR(-ENOMEM);
	160	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	161	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
bd4c625c LT	162	for (n = 0; n < acl->a_count; n++) {
	163	reiserfs_acl_entry entry = (reiserfs_acl_entry ) e;
	164	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
1da177e4	165	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
bd4c625c LT	166	switch (acl->a_entries[n].e_tag) {
	167	case ACL_USER:
	168	case ACL_GROUP:
	169	entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
	170	e += sizeof(reiserfs_acl_entry);
	171	break;
	172
	173	case ACL_USER_OBJ:
	174	case ACL_GROUP_OBJ:
	175	case ACL_MASK:
	176	case ACL_OTHER:
	177	e += sizeof(reiserfs_acl_entry_short);
	178	break;
	179
	180	default:
	181	goto fail;
1da177e4 LT	182	}
	183	}
	184	return (char *)ext_acl;
	185
bd4c625c	186	fail:
1da177e4 LT	187	kfree(ext_acl);
	188	return ERR_PTR(-EINVAL);
	189	}
	190
d984561b JM	191	static inline void iset_acl(struct inode inode, struct posix_acl *i_acl,
	192	struct posix_acl *acl)
	193	{
	194	spin_lock(&inode->i_lock);
	195	if (*i_acl != ERR_PTR(-ENODATA))
	196	posix_acl_release(*i_acl);
e68888bc	197	*i_acl = acl ? posix_acl_dup(acl) : ERR_PTR(-ENODATA);
d984561b JM	198	spin_unlock(&inode->i_lock);
	199	}
	200
	201	static inline struct posix_acl iget_acl(struct inode inode,
	202	struct posix_acl **i_acl)
	203	{
	204	struct posix_acl *acl = ERR_PTR(-ENODATA);
	205
	206	spin_lock(&inode->i_lock);
	207	if (*i_acl != ERR_PTR(-ENODATA))
	208	acl = posix_acl_dup(*i_acl);
	209	spin_unlock(&inode->i_lock);
	210
	211	return acl;
	212	}
	213
1da177e4 LT	214	/*
	215	* Inode operation get_posix_acl().
	216	*
1b1dcc1b	217	* inode->i_mutex: down
1da177e4 LT	218	* BKL held [before 2.5.x]
1da177e4 LT	219	*/
bd4c625c	220	struct posix_acl reiserfs_get_acl(struct inode inode, int type)
1da177e4 LT	221	{
	222	char name, value;
	223	struct posix_acl acl, *p_acl;
3cdc409c	224	int size;
1da177e4	225	int retval;
bd4c625c LT	226	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
	227
	228	switch (type) {
	229	case ACL_TYPE_ACCESS:
	230	name = POSIX_ACL_XATTR_ACCESS;
	231	p_acl = &reiserfs_i->i_acl_access;
	232	break;
	233	case ACL_TYPE_DEFAULT:
	234	name = POSIX_ACL_XATTR_DEFAULT;
	235	p_acl = &reiserfs_i->i_acl_default;
	236	break;
	237	default:
	238	return ERR_PTR(-EINVAL);
	239	}
	240
d984561b JM	241	acl = iget_acl(inode, p_acl);
	242	if (acl && !IS_ERR(acl))
	243	return acl;
	244	else if (PTR_ERR(acl) == -ENODATA)
	245	return NULL;
bd4c625c LT	246
bd4c625c LT	247	size = reiserfs_xattr_get(inode, name, NULL, 0);
3cdc409c	248	if (size < 0) {
bd4c625c LT	249	if (size == -ENODATA \|\| size == -ENOSYS) {
	250	*p_acl = ERR_PTR(-ENODATA);
	251	return NULL;
	252	}
	253	return ERR_PTR(size);
	254	}
1da177e4	255
bd4c625c LT	256	value = kmalloc(size, GFP_NOFS);
	257	if (!value)
	258	return ERR_PTR(-ENOMEM);
1da177e4 LT	259
	260	retval = reiserfs_xattr_get(inode, name, value, size);
	261	if (retval == -ENODATA \|\| retval == -ENOSYS) {
	262	/* This shouldn't actually happen as it should have
	263	been caught above.. but just in case */
	264	acl = NULL;
bd4c625c LT	265	*p_acl = ERR_PTR(-ENODATA);
bd4c625c LT	266	} else if (retval < 0) {
1da177e4 LT	267	acl = ERR_PTR(retval);
	268	} else {
	269	acl = posix_acl_from_disk(value, retval);
90947ef2	270	if (!IS_ERR(acl))
d984561b	271	iset_acl(inode, p_acl, acl);
bd4c625c	272	}
1da177e4 LT	273
	274	kfree(value);
	275	return acl;
	276	}
	277
	278	/*
	279	* Inode operation set_posix_acl().
	280	*
1b1dcc1b	281	* inode->i_mutex: down
1da177e4 LT	282	* BKL held [before 2.5.x]
	283	*/
	284	static int
0ab2621e JM	285	reiserfs_set_acl(struct reiserfs_transaction_handle th, struct inode inode,
0ab2621e JM	286	int type, struct posix_acl *acl)
1da177e4	287	{
bd4c625c	288	char *name;
1da177e4 LT	289	void *value = NULL;
1da177e4 LT	290	struct posix_acl **p_acl;
48b32a35	291	size_t size = 0;
1da177e4	292	int error;
bd4c625c	293	struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
1da177e4 LT	294
	295	if (S_ISLNK(inode->i_mode))
	296	return -EOPNOTSUPP;
	297
bd4c625c LT	298	switch (type) {
	299	case ACL_TYPE_ACCESS:
	300	name = POSIX_ACL_XATTR_ACCESS;
	301	p_acl = &reiserfs_i->i_acl_access;
	302	if (acl) {
	303	mode_t mode = inode->i_mode;
	304	error = posix_acl_equiv_mode(acl, &mode);
	305	if (error < 0)
	306	return error;
	307	else {
	308	inode->i_mode = mode;
	309	if (error == 0)
	310	acl = NULL;
	311	}
	312	}
	313	break;
	314	case ACL_TYPE_DEFAULT:
	315	name = POSIX_ACL_XATTR_DEFAULT;
	316	p_acl = &reiserfs_i->i_acl_default;
	317	if (!S_ISDIR(inode->i_mode))
	318	return acl ? -EACCES : 0;
	319	break;
	320	default:
	321	return -EINVAL;
	322	}
	323
	324	if (acl) {
	325	value = posix_acl_to_disk(acl, &size);
	326	if (IS_ERR(value))
	327	return (int)PTR_ERR(value);
48b32a35 JM	328	}
48b32a35 JM	329
0ab2621e	330	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);
48b32a35 JM	331
	332	/*
	333	* Ensure that the inode gets dirtied if we're only using
	334	* the mode bits and an old ACL didn't exist. We don't need
	335	* to check if the inode is hashed here since we won't get
	336	* called by reiserfs_inherit_default_acl().
	337	*/
	338	if (error == -ENODATA) {
	339	error = 0;
	340	if (type == ACL_TYPE_ACCESS) {
	341	inode->i_ctime = CURRENT_TIME_SEC;
bd4c625c	342	mark_inode_dirty(inode);
bd4c625c LT	343	}
bd4c625c LT	344	}
1da177e4	345
833d304b	346	kfree(value);
1da177e4	347
d984561b JM	348	if (!error)
d984561b JM	349	iset_acl(inode, p_acl, acl);
1da177e4 LT	350
	351	return error;
	352	}
	353
1b1dcc1b	354	/* dir->i_mutex: locked,
1da177e4 LT	355	* inode is new and not released into the wild yet */
1da177e4 LT	356	int
0ab2621e JM	357	reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	358	struct inode dir, struct dentry dentry,
bd4c625c	359	struct inode *inode)
1da177e4	360	{
bd4c625c LT	361	struct posix_acl *acl;
	362	int err = 0;
	363
	364	/* ACLs only get applied to files and directories */
	365	if (S_ISLNK(inode->i_mode))
	366	return 0;
	367
	368	/* ACLs can only be used on "new" objects, so if it's an old object
	369	* there is nothing to inherit from */
	370	if (get_inode_sd_version(dir) == STAT_DATA_V1)
	371	goto apply_umask;
	372
	373	/* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
	374	* would be useless since permissions are ignored, and a pain because
	375	* it introduces locking cycles */
6dfede69 JM	376	if (IS_PRIVATE(dir)) {
6dfede69 JM	377	inode->i_flags \|= S_PRIVATE;
bd4c625c LT	378	goto apply_umask;
	379	}
	380
	381	acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
	382	if (IS_ERR(acl)) {
	383	if (PTR_ERR(acl) == -ENODATA)
	384	goto apply_umask;
	385	return PTR_ERR(acl);
	386	}
	387
	388	if (acl) {
	389	struct posix_acl *acl_copy;
	390	mode_t mode = inode->i_mode;
	391	int need_acl;
	392
	393	/* Copy the default ACL to the default ACL of a new directory */
	394	if (S_ISDIR(inode->i_mode)) {
0ab2621e JM	395	err = reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
0ab2621e JM	396	acl);
bd4c625c LT	397	if (err)
	398	goto cleanup;
	399	}
	400
	401	/* Now we reconcile the new ACL and the mode,
	402	potentially modifying both */
	403	acl_copy = posix_acl_clone(acl, GFP_NOFS);
	404	if (!acl_copy) {
	405	err = -ENOMEM;
	406	goto cleanup;
	407	}
	408
	409	need_acl = posix_acl_create_masq(acl_copy, &mode);
	410	if (need_acl >= 0) {
	411	if (mode != inode->i_mode) {
	412	inode->i_mode = mode;
	413	}
	414
	415	/* If we need an ACL.. */
	416	if (need_acl > 0) {
0ab2621e JM	417	err = reiserfs_set_acl(th, inode,
	418	ACL_TYPE_ACCESS,
	419	acl_copy);
bd4c625c LT	420	if (err)
	421	goto cleanup_copy;
	422	}
	423	}
	424	cleanup_copy:
	425	posix_acl_release(acl_copy);
	426	cleanup:
	427	posix_acl_release(acl);
	428	} else {
	429	apply_umask:
	430	/* no ACL, apply umask */
ce3b0f8d	431	inode->i_mode &= ~current_umask();
bd4c625c LT	432	}
	433
	434	return err;
1da177e4 LT	435	}
1da177e4 LT	436
0ab2621e JM	437	/* This is used to cache the default acl before a new object is created.
	438	* The biggest reason for this is to get an idea of how many blocks will
	439	* actually be required for the create operation if we must inherit an ACL.
	440	* An ACL write can add up to 3 object creations and an additional file write
	441	* so we'd prefer not to reserve that many blocks in the journal if we can.
	442	* It also has the advantage of not loading the ACL with a transaction open,
	443	* this may seem silly, but if the owner of the directory is doing the
	444	* creation, the ACL may not be loaded since the permissions wouldn't require
	445	* it.
	446	* We return the number of blocks required for the transaction.
	447	*/
bd4c625c	448	int reiserfs_cache_default_acl(struct inode *inode)
1da177e4	449	{
0ab2621e JM	450	struct posix_acl *acl;
	451	int nblocks = 0;
	452
	453	if (IS_PRIVATE(inode))
	454	return 0;
	455
	456	acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
	457
	458	if (acl && !IS_ERR(acl)) {
	459	int size = reiserfs_acl_size(acl->a_count);
	460
	461	/* Other xattrs can be created during inode creation. We don't
	462	* want to claim too many blocks, so we check to see if we
	463	* we need to create the tree to the xattrs, and then we
	464	* just want two files. */
	465	nblocks = reiserfs_xattr_jcreate_nblocks(inode);
	466	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	467
	468	REISERFS_I(inode)->i_flags \|= i_has_xattr_dir;
	469
	470	/* We need to account for writes + bitmaps for two files */
	471	nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
	472	posix_acl_release(acl);
bd4c625c LT	473	}
bd4c625c LT	474
0ab2621e	475	return nblocks;
1da177e4 LT	476	}
1da177e4 LT	477
bd4c625c	478	int reiserfs_acl_chmod(struct inode *inode)
1da177e4	479	{
bd4c625c LT	480	struct posix_acl acl, clone;
bd4c625c LT	481	int error;
1da177e4	482
bd4c625c LT	483	if (S_ISLNK(inode->i_mode))
bd4c625c LT	484	return -EOPNOTSUPP;
1da177e4	485
bd4c625c LT	486	if (get_inode_sd_version(inode) == STAT_DATA_V1 \|\|
	487	!reiserfs_posixacl(inode->i_sb)) {
	488	return 0;
1da177e4 LT	489	}
1da177e4 LT	490
bd4c625c	491	acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
bd4c625c LT	492	if (!acl)
	493	return 0;
	494	if (IS_ERR(acl))
	495	return PTR_ERR(acl);
	496	clone = posix_acl_clone(acl, GFP_NOFS);
	497	posix_acl_release(acl);
	498	if (!clone)
	499	return -ENOMEM;
	500	error = posix_acl_chmod_masq(clone, inode->i_mode);
0ab2621e JM	501	if (!error) {
	502	struct reiserfs_transaction_handle th;
	503	size_t size = reiserfs_xattr_nblocks(inode,
	504	reiserfs_acl_size(clone->a_count));
	505	reiserfs_write_lock(inode->i_sb);
	506	error = journal_begin(&th, inode->i_sb, size * 2);
	507	if (!error) {
	508	int error2;
	509	error = reiserfs_set_acl(&th, inode, ACL_TYPE_ACCESS,
	510	clone);
	511	error2 = journal_end(&th, inode->i_sb, size * 2);
	512	if (error2)
	513	error = error2;
	514	}
	515	reiserfs_write_unlock(inode->i_sb);
	516	}
bd4c625c LT	517	posix_acl_release(clone);
bd4c625c LT	518	return error;
1da177e4 LT	519	}
	520
	521	static int
	522	posix_acl_access_get(struct inode inode, const char name,
bd4c625c	523	void *buffer, size_t size)
1da177e4	524	{
bd4c625c	525	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
1da177e4 LT	526	return -EINVAL;
	527	return xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
	528	}
	529
	530	static int
	531	posix_acl_access_set(struct inode inode, const char name,
bd4c625c	532	const void *value, size_t size, int flags)
1da177e4	533	{
bd4c625c	534	if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
1da177e4 LT	535	return -EINVAL;
	536	return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
	537	}
	538
48b32a35 JM	539	static size_t posix_acl_access_list(struct inode inode, char list,
	540	size_t list_size, const char *name,
	541	size_t name_len)
1da177e4	542	{
48b32a35	543	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
bd4c625c LT	544	if (!reiserfs_posixacl(inode->i_sb))
bd4c625c LT	545	return 0;
48b32a35 JM	546	if (list && size <= list_size)
	547	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	548	return size;
1da177e4 LT	549	}
1da177e4 LT	550
48b32a35	551	struct xattr_handler reiserfs_posix_acl_access_handler = {
9a59f452	552	.prefix = POSIX_ACL_XATTR_ACCESS,
1da177e4 LT	553	.get = posix_acl_access_get,
1da177e4 LT	554	.set = posix_acl_access_set,
1da177e4 LT	555	.list = posix_acl_access_list,
	556	};
	557
	558	static int
bd4c625c LT	559	posix_acl_default_get(struct inode inode, const char name,
bd4c625c LT	560	void *buffer, size_t size)
1da177e4	561	{
bd4c625c	562	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
1da177e4 LT	563	return -EINVAL;
	564	return xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
	565	}
	566
	567	static int
	568	posix_acl_default_set(struct inode inode, const char name,
bd4c625c	569	const void *value, size_t size, int flags)
1da177e4	570	{
bd4c625c	571	if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
1da177e4 LT	572	return -EINVAL;
	573	return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
	574	}
	575
48b32a35 JM	576	static size_t posix_acl_default_list(struct inode inode, char list,
	577	size_t list_size, const char *name,
	578	size_t name_len)
1da177e4	579	{
48b32a35	580	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
bd4c625c LT	581	if (!reiserfs_posixacl(inode->i_sb))
bd4c625c LT	582	return 0;
48b32a35 JM	583	if (list && size <= list_size)
	584	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	585	return size;
1da177e4 LT	586	}
1da177e4 LT	587
48b32a35	588	struct xattr_handler reiserfs_posix_acl_default_handler = {
9a59f452	589	.prefix = POSIX_ACL_XATTR_DEFAULT,
1da177e4 LT	590	.get = posix_acl_default_get,
1da177e4 LT	591	.set = posix_acl_default_set,
1da177e4 LT	592	.list = posix_acl_default_list,
1da177e4 LT	593	};