[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
posix_acl_set(struct dentry *dentry, const char *name, const void *value,
		size_t size, int flags, int type)
{
	struct inode *inode = dentry->d_inode;
	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
posix_acl_get(struct dentry *dentry, const char *name, void *buffer,
		size_t size, int type)
{
	struct posix_acl *acl;
	int error;

	if (!reiserfs_posixacl(dentry->d_sb))
		return -EOPNOTSUPP;

	acl = reiserfs_get_acl(dentry->d_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);
}

/*
 * 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;

	acl = get_cached_acl(inode, type);
	if (acl != ACL_NOT_CACHED)
		return acl;

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

	size = reiserfs_xattr_get(inode, name, NULL, 0);
	if (size < 0) {
		if (size == -ENODATA || size == -ENOSYS) {
			set_cached_acl(inode, type, NULL);
			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 = posix_acl_from_disk(value, retval);
	}
	if (!IS_ERR(acl))
		set_cached_acl(inode, type, 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;
	size_t size = 0;
	int error;

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

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = POSIX_ACL_XATTR_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;
		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)
		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 *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))
		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 size_t posix_acl_access_list(struct dentry *dentry, char *list,
				    size_t list_size, const char *name,
				    size_t name_len, int type)
{
	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
	if (!reiserfs_posixacl(dentry->d_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,
	.flags = ACL_TYPE_ACCESS,
	.get = posix_acl_get,
	.set = posix_acl_set,
	.list = posix_acl_access_list,
};

static size_t posix_acl_default_list(struct dentry *dentry, char *list,
				     size_t list_size, const char *name,
				     size_t name_len, int type)
{
	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
	if (!reiserfs_posixacl(dentry->d_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,
	.flags = ACL_TYPE_DEFAULT,
	.get = posix_acl_get,
	.set = posix_acl_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
1da177e4 LT	17	static int
431547b3 CH	18	posix_acl_set(struct dentry dentry, const char name, const void *value,
431547b3 CH	19	size_t size, int flags, int type)
1da177e4	20	{
431547b3	21	struct inode *inode = dentry->d_inode;
1da177e4	22	struct posix_acl *acl;
0ab2621e JM	23	int error, error2;
	24	struct reiserfs_transaction_handle th;
	25	size_t jcreate_blocks;
1da177e4 LT	26	if (!reiserfs_posixacl(inode->i_sb))
1da177e4 LT	27	return -EOPNOTSUPP;
3bd858ab	28	if (!is_owner_or_cap(inode))
1da177e4 LT	29	return -EPERM;
	30
	31	if (value) {
	32	acl = posix_acl_from_xattr(value, size);
	33	if (IS_ERR(acl)) {
	34	return PTR_ERR(acl);
	35	} else if (acl) {
	36	error = posix_acl_valid(acl);
	37	if (error)
	38	goto release_and_out;
	39	}
	40	} else
	41	acl = NULL;
	42
0ab2621e JM	43	/* Pessimism: We can't assume that anything from the xattr root up
	44	* has been created. */
	45
	46	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
	47	reiserfs_xattr_nblocks(inode, size) * 2;
	48
	49	reiserfs_write_lock(inode->i_sb);
	50	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
	51	if (error == 0) {
	52	error = reiserfs_set_acl(&th, inode, type, acl);
	53	error2 = journal_end(&th, inode->i_sb, jcreate_blocks);
	54	if (error2)
	55	error = error2;
	56	}
	57	reiserfs_write_unlock(inode->i_sb);
1da177e4	58
bd4c625c	59	release_and_out:
1da177e4 LT	60	posix_acl_release(acl);
	61	return error;
	62	}
	63
1da177e4	64	static int
431547b3 CH	65	posix_acl_get(struct dentry dentry, const char name, void *buffer,
431547b3 CH	66	size_t size, int type)
1da177e4 LT	67	{
	68	struct posix_acl *acl;
	69	int error;
	70
431547b3	71	if (!reiserfs_posixacl(dentry->d_sb))
1da177e4 LT	72	return -EOPNOTSUPP;
1da177e4 LT	73
431547b3	74	acl = reiserfs_get_acl(dentry->d_inode, type);
1da177e4 LT	75	if (IS_ERR(acl))
	76	return PTR_ERR(acl);
	77	if (acl == NULL)
	78	return -ENODATA;
	79	error = posix_acl_to_xattr(acl, buffer, size);
	80	posix_acl_release(acl);
	81
	82	return error;
	83	}
	84
1da177e4 LT	85	/*
	86	* Convert from filesystem to in-memory representation.
	87	*/
bd4c625c	88	static struct posix_acl posix_acl_from_disk(const void value, size_t size)
1da177e4 LT	89	{
	90	const char end = (char )value + size;
	91	int n, count;
	92	struct posix_acl *acl;
	93
	94	if (!value)
	95	return NULL;
	96	if (size < sizeof(reiserfs_acl_header))
bd4c625c LT	97	return ERR_PTR(-EINVAL);
bd4c625c LT	98	if (((reiserfs_acl_header *) value)->a_version !=
1da177e4 LT	99	cpu_to_le32(REISERFS_ACL_VERSION))
	100	return ERR_PTR(-EINVAL);
	101	value = (char *)value + sizeof(reiserfs_acl_header);
	102	count = reiserfs_acl_count(size);
	103	if (count < 0)
	104	return ERR_PTR(-EINVAL);
	105	if (count == 0)
	106	return NULL;
	107	acl = posix_acl_alloc(count, GFP_NOFS);
	108	if (!acl)
	109	return ERR_PTR(-ENOMEM);
bd4c625c LT	110	for (n = 0; n < count; n++) {
bd4c625c LT	111	reiserfs_acl_entry entry = (reiserfs_acl_entry ) value;
1da177e4 LT	112	if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
1da177e4 LT	113	goto fail;
bd4c625c	114	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
1da177e4	115	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
bd4c625c LT	116	switch (acl->a_entries[n].e_tag) {
	117	case ACL_USER_OBJ:
	118	case ACL_GROUP_OBJ:
	119	case ACL_MASK:
	120	case ACL_OTHER:
	121	value = (char *)value +
	122	sizeof(reiserfs_acl_entry_short);
	123	acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
	124	break;
	125
	126	case ACL_USER:
	127	case ACL_GROUP:
	128	value = (char *)value + sizeof(reiserfs_acl_entry);
	129	if ((char *)value > end)
1da177e4	130	goto fail;
bd4c625c LT	131	acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
	132	break;
	133
	134	default:
	135	goto fail;
1da177e4 LT	136	}
	137	}
	138	if (value != end)
	139	goto fail;
	140	return acl;
	141
bd4c625c	142	fail:
1da177e4 LT	143	posix_acl_release(acl);
	144	return ERR_PTR(-EINVAL);
	145	}
	146
	147	/*
	148	* Convert from in-memory to filesystem representation.
	149	*/
bd4c625c	150	static void posix_acl_to_disk(const struct posix_acl acl, size_t * size)
1da177e4 LT	151	{
	152	reiserfs_acl_header *ext_acl;
	153	char *e;
	154	int n;
	155
	156	*size = reiserfs_acl_size(acl->a_count);
5cbded58	157	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
bd4c625c LT	158	acl->a_count *
	159	sizeof(reiserfs_acl_entry),
	160	GFP_NOFS);
1da177e4 LT	161	if (!ext_acl)
	162	return ERR_PTR(-ENOMEM);
	163	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	164	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
bd4c625c LT	165	for (n = 0; n < acl->a_count; n++) {
	166	reiserfs_acl_entry entry = (reiserfs_acl_entry ) e;
	167	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
1da177e4	168	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
bd4c625c LT	169	switch (acl->a_entries[n].e_tag) {
	170	case ACL_USER:
	171	case ACL_GROUP:
	172	entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
	173	e += sizeof(reiserfs_acl_entry);
	174	break;
	175
	176	case ACL_USER_OBJ:
	177	case ACL_GROUP_OBJ:
	178	case ACL_MASK:
	179	case ACL_OTHER:
	180	e += sizeof(reiserfs_acl_entry_short);
	181	break;
	182
	183	default:
	184	goto fail;
1da177e4 LT	185	}
	186	}
	187	return (char *)ext_acl;
	188
bd4c625c	189	fail:
1da177e4 LT	190	kfree(ext_acl);
	191	return ERR_PTR(-EINVAL);
	192	}
	193
	194	/*
	195	* Inode operation get_posix_acl().
	196	*
1b1dcc1b	197	* inode->i_mutex: down
1da177e4 LT	198	* BKL held [before 2.5.x]
1da177e4 LT	199	*/
bd4c625c	200	struct posix_acl reiserfs_get_acl(struct inode inode, int type)
1da177e4 LT	201	{
1da177e4 LT	202	char name, value;
073aaa1b	203	struct posix_acl *acl;
3cdc409c	204	int size;
1da177e4	205	int retval;
bd4c625c	206
073aaa1b AV	207	acl = get_cached_acl(inode, type);
	208	if (acl != ACL_NOT_CACHED)
	209	return acl;
	210
bd4c625c LT	211	switch (type) {
	212	case ACL_TYPE_ACCESS:
	213	name = POSIX_ACL_XATTR_ACCESS;
bd4c625c LT	214	break;
	215	case ACL_TYPE_DEFAULT:
	216	name = POSIX_ACL_XATTR_DEFAULT;
bd4c625c LT	217	break;
bd4c625c LT	218	default:
073aaa1b	219	BUG();
bd4c625c LT	220	}
bd4c625c LT	221
bd4c625c	222	size = reiserfs_xattr_get(inode, name, NULL, 0);
3cdc409c	223	if (size < 0) {
bd4c625c	224	if (size == -ENODATA \|\| size == -ENOSYS) {
073aaa1b	225	set_cached_acl(inode, type, NULL);
bd4c625c LT	226	return NULL;
	227	}
	228	return ERR_PTR(size);
	229	}
1da177e4	230
bd4c625c LT	231	value = kmalloc(size, GFP_NOFS);
	232	if (!value)
	233	return ERR_PTR(-ENOMEM);
1da177e4 LT	234
	235	retval = reiserfs_xattr_get(inode, name, value, size);
	236	if (retval == -ENODATA \|\| retval == -ENOSYS) {
	237	/* This shouldn't actually happen as it should have
	238	been caught above.. but just in case */
	239	acl = NULL;
bd4c625c	240	} else if (retval < 0) {
1da177e4 LT	241	acl = ERR_PTR(retval);
	242	} else {
	243	acl = posix_acl_from_disk(value, retval);
bd4c625c	244	}
073aaa1b AV	245	if (!IS_ERR(acl))
073aaa1b AV	246	set_cached_acl(inode, type, acl);
1da177e4 LT	247
	248	kfree(value);
	249	return acl;
	250	}
	251
	252	/*
	253	* Inode operation set_posix_acl().
	254	*
1b1dcc1b	255	* inode->i_mutex: down
1da177e4 LT	256	* BKL held [before 2.5.x]
	257	*/
	258	static int
0ab2621e JM	259	reiserfs_set_acl(struct reiserfs_transaction_handle th, struct inode inode,
0ab2621e JM	260	int type, struct posix_acl *acl)
1da177e4	261	{
bd4c625c	262	char *name;
1da177e4	263	void *value = NULL;
48b32a35	264	size_t size = 0;
1da177e4	265	int error;
1da177e4 LT	266
	267	if (S_ISLNK(inode->i_mode))
	268	return -EOPNOTSUPP;
	269
bd4c625c LT	270	switch (type) {
	271	case ACL_TYPE_ACCESS:
	272	name = POSIX_ACL_XATTR_ACCESS;
bd4c625c LT	273	if (acl) {
	274	mode_t mode = inode->i_mode;
	275	error = posix_acl_equiv_mode(acl, &mode);
	276	if (error < 0)
	277	return error;
	278	else {
	279	inode->i_mode = mode;
	280	if (error == 0)
	281	acl = NULL;
	282	}
	283	}
	284	break;
	285	case ACL_TYPE_DEFAULT:
	286	name = POSIX_ACL_XATTR_DEFAULT;
bd4c625c LT	287	if (!S_ISDIR(inode->i_mode))
	288	return acl ? -EACCES : 0;
	289	break;
	290	default:
	291	return -EINVAL;
	292	}
	293
	294	if (acl) {
	295	value = posix_acl_to_disk(acl, &size);
	296	if (IS_ERR(value))
	297	return (int)PTR_ERR(value);
48b32a35 JM	298	}
48b32a35 JM	299
0ab2621e	300	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);
48b32a35 JM	301
	302	/*
	303	* Ensure that the inode gets dirtied if we're only using
	304	* the mode bits and an old ACL didn't exist. We don't need
	305	* to check if the inode is hashed here since we won't get
	306	* called by reiserfs_inherit_default_acl().
	307	*/
	308	if (error == -ENODATA) {
	309	error = 0;
	310	if (type == ACL_TYPE_ACCESS) {
	311	inode->i_ctime = CURRENT_TIME_SEC;
bd4c625c	312	mark_inode_dirty(inode);
bd4c625c LT	313	}
bd4c625c LT	314	}
1da177e4	315
833d304b	316	kfree(value);
1da177e4	317
d984561b	318	if (!error)
073aaa1b	319	set_cached_acl(inode, type, acl);
1da177e4 LT	320
	321	return error;
	322	}
	323
1b1dcc1b	324	/* dir->i_mutex: locked,
1da177e4 LT	325	* inode is new and not released into the wild yet */
1da177e4 LT	326	int
0ab2621e JM	327	reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	328	struct inode dir, struct dentry dentry,
bd4c625c	329	struct inode *inode)
1da177e4	330	{
bd4c625c LT	331	struct posix_acl *acl;
	332	int err = 0;
	333
	334	/* ACLs only get applied to files and directories */
	335	if (S_ISLNK(inode->i_mode))
	336	return 0;
	337
	338	/* ACLs can only be used on "new" objects, so if it's an old object
	339	* there is nothing to inherit from */
	340	if (get_inode_sd_version(dir) == STAT_DATA_V1)
	341	goto apply_umask;
	342
	343	/* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
	344	* would be useless since permissions are ignored, and a pain because
	345	* it introduces locking cycles */
6dfede69 JM	346	if (IS_PRIVATE(dir)) {
6dfede69 JM	347	inode->i_flags \|= S_PRIVATE;
bd4c625c LT	348	goto apply_umask;
	349	}
	350
	351	acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
7a77b15d	352	if (IS_ERR(acl))
bd4c625c	353	return PTR_ERR(acl);
bd4c625c LT	354
	355	if (acl) {
	356	struct posix_acl *acl_copy;
	357	mode_t mode = inode->i_mode;
	358	int need_acl;
	359
	360	/* Copy the default ACL to the default ACL of a new directory */
	361	if (S_ISDIR(inode->i_mode)) {
0ab2621e JM	362	err = reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
0ab2621e JM	363	acl);
bd4c625c LT	364	if (err)
	365	goto cleanup;
	366	}
	367
	368	/* Now we reconcile the new ACL and the mode,
	369	potentially modifying both */
	370	acl_copy = posix_acl_clone(acl, GFP_NOFS);
	371	if (!acl_copy) {
	372	err = -ENOMEM;
	373	goto cleanup;
	374	}
	375
	376	need_acl = posix_acl_create_masq(acl_copy, &mode);
	377	if (need_acl >= 0) {
	378	if (mode != inode->i_mode) {
	379	inode->i_mode = mode;
	380	}
	381
	382	/* If we need an ACL.. */
	383	if (need_acl > 0) {
0ab2621e JM	384	err = reiserfs_set_acl(th, inode,
	385	ACL_TYPE_ACCESS,
	386	acl_copy);
bd4c625c LT	387	if (err)
	388	goto cleanup_copy;
	389	}
	390	}
	391	cleanup_copy:
	392	posix_acl_release(acl_copy);
	393	cleanup:
	394	posix_acl_release(acl);
	395	} else {
	396	apply_umask:
	397	/* no ACL, apply umask */
ce3b0f8d	398	inode->i_mode &= ~current_umask();
bd4c625c LT	399	}
	400
	401	return err;
1da177e4 LT	402	}
1da177e4 LT	403
0ab2621e JM	404	/* This is used to cache the default acl before a new object is created.
	405	* The biggest reason for this is to get an idea of how many blocks will
	406	* actually be required for the create operation if we must inherit an ACL.
	407	* An ACL write can add up to 3 object creations and an additional file write
	408	* so we'd prefer not to reserve that many blocks in the journal if we can.
	409	* It also has the advantage of not loading the ACL with a transaction open,
	410	* this may seem silly, but if the owner of the directory is doing the
	411	* creation, the ACL may not be loaded since the permissions wouldn't require
	412	* it.
	413	* We return the number of blocks required for the transaction.
	414	*/
bd4c625c	415	int reiserfs_cache_default_acl(struct inode *inode)
1da177e4	416	{
0ab2621e JM	417	struct posix_acl *acl;
	418	int nblocks = 0;
	419
	420	if (IS_PRIVATE(inode))
	421	return 0;
	422
	423	acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
	424
	425	if (acl && !IS_ERR(acl)) {
	426	int size = reiserfs_acl_size(acl->a_count);
	427
	428	/* Other xattrs can be created during inode creation. We don't
	429	* want to claim too many blocks, so we check to see if we
	430	* we need to create the tree to the xattrs, and then we
	431	* just want two files. */
	432	nblocks = reiserfs_xattr_jcreate_nblocks(inode);
	433	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	434
	435	REISERFS_I(inode)->i_flags \|= i_has_xattr_dir;
	436
	437	/* We need to account for writes + bitmaps for two files */
	438	nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
	439	posix_acl_release(acl);
bd4c625c LT	440	}
bd4c625c LT	441
0ab2621e	442	return nblocks;
1da177e4 LT	443	}
1da177e4 LT	444
bd4c625c	445	int reiserfs_acl_chmod(struct inode *inode)
1da177e4	446	{
bd4c625c LT	447	struct posix_acl acl, clone;
bd4c625c LT	448	int error;
1da177e4	449
bd4c625c LT	450	if (S_ISLNK(inode->i_mode))
bd4c625c LT	451	return -EOPNOTSUPP;
1da177e4	452
bd4c625c LT	453	if (get_inode_sd_version(inode) == STAT_DATA_V1 \|\|
	454	!reiserfs_posixacl(inode->i_sb)) {
	455	return 0;
1da177e4 LT	456	}
1da177e4 LT	457
bd4c625c	458	acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
bd4c625c LT	459	if (!acl)
	460	return 0;
	461	if (IS_ERR(acl))
	462	return PTR_ERR(acl);
	463	clone = posix_acl_clone(acl, GFP_NOFS);
	464	posix_acl_release(acl);
	465	if (!clone)
	466	return -ENOMEM;
	467	error = posix_acl_chmod_masq(clone, inode->i_mode);
0ab2621e JM	468	if (!error) {
	469	struct reiserfs_transaction_handle th;
	470	size_t size = reiserfs_xattr_nblocks(inode,
	471	reiserfs_acl_size(clone->a_count));
	472	reiserfs_write_lock(inode->i_sb);
	473	error = journal_begin(&th, inode->i_sb, size * 2);
	474	if (!error) {
	475	int error2;
	476	error = reiserfs_set_acl(&th, inode, ACL_TYPE_ACCESS,
	477	clone);
	478	error2 = journal_end(&th, inode->i_sb, size * 2);
	479	if (error2)
	480	error = error2;
	481	}
	482	reiserfs_write_unlock(inode->i_sb);
	483	}
bd4c625c LT	484	posix_acl_release(clone);
bd4c625c LT	485	return error;
1da177e4 LT	486	}
1da177e4 LT	487
431547b3	488	static size_t posix_acl_access_list(struct dentry dentry, char list,
48b32a35	489	size_t list_size, const char *name,
431547b3	490	size_t name_len, int type)
1da177e4	491	{
48b32a35	492	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
431547b3	493	if (!reiserfs_posixacl(dentry->d_sb))
bd4c625c	494	return 0;
48b32a35 JM	495	if (list && size <= list_size)
	496	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	497	return size;
1da177e4 LT	498	}
1da177e4 LT	499
48b32a35	500	struct xattr_handler reiserfs_posix_acl_access_handler = {
9a59f452	501	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3 CH	502	.flags = ACL_TYPE_ACCESS,
	503	.get = posix_acl_get,
	504	.set = posix_acl_set,
1da177e4 LT	505	.list = posix_acl_access_list,
	506	};
	507
431547b3	508	static size_t posix_acl_default_list(struct dentry dentry, char list,
48b32a35	509	size_t list_size, const char *name,
431547b3	510	size_t name_len, int type)
1da177e4	511	{
48b32a35	512	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
431547b3	513	if (!reiserfs_posixacl(dentry->d_sb))
bd4c625c	514	return 0;
48b32a35 JM	515	if (list && size <= list_size)
	516	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	517	return size;
1da177e4 LT	518	}
1da177e4 LT	519
48b32a35	520	struct xattr_handler reiserfs_posix_acl_default_handler = {
9a59f452	521	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3 CH	522	.flags = ACL_TYPE_DEFAULT,
	523	.get = posix_acl_get,
	524	.set = posix_acl_set,
1da177e4 LT	525	.list = posix_acl_default_list,
1da177e4 LT	526	};