[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / reiserfs / xattr_acl.c

#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/posix_acl.h>
#include "reiserfs.h"
#include <linux/errno.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/slab.h>
#include <linux/posix_acl_xattr.h>
#include "xattr.h"
#include "acl.h"
#include <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 (!inode_owner_or_capable(inode))
		return -EPERM;

	if (value) {
		acl = posix_acl_from_xattr(&init_user_ns, 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(&init_user_ns, 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);
			break;

		case ACL_USER:
			value = (char *)value + sizeof(reiserfs_acl_entry);
			if ((char *)value > end)
				goto fail;
			acl->a_entries[n].e_uid = 
				make_kuid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;
		case ACL_GROUP:
			value = (char *)value + sizeof(reiserfs_acl_entry);
			if ((char *)value > end)
				goto fail;
			acl->a_entries[n].e_gid =
				make_kgid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;

		default:
			goto fail;
		}
	}
	if (value != end)
		goto fail;
	return acl;

      fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

/*
 * Convert from in-memory to filesystem representation.
 */
static void *posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
{
	reiserfs_acl_header *ext_acl;
	char *e;
	int n;

	*size = reiserfs_acl_size(acl->a_count);
	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
						  acl->a_count *
						  sizeof(reiserfs_acl_entry),
						  GFP_NOFS);
	if (!ext_acl)
		return ERR_PTR(-ENOMEM);
	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
	for (n = 0; n < acl->a_count; n++) {
		const struct posix_acl_entry *acl_e = &acl->a_entries[n];
		reiserfs_acl_entry *entry = (reiserfs_acl_entry *) e;
		entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
		entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
		switch (acl->a_entries[n].e_tag) {
		case ACL_USER:
			entry->e_id = cpu_to_le32(
				from_kuid(&init_user_ns, acl_e->e_uid));
			e += sizeof(reiserfs_acl_entry);
			break;
		case ACL_GROUP:
			entry->e_id = cpu_to_le32(
				from_kgid(&init_user_ns, acl_e->e_gid));
			e += sizeof(reiserfs_acl_entry);
			break;

		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			e += sizeof(reiserfs_acl_entry_short);
			break;

		default:
			goto fail;
		}
	}
	return (char *)ext_acl;

      fail:
	kfree(ext_acl);
	return ERR_PTR(-EINVAL);
}

/*
 * Inode operation get_posix_acl().
 *
 * inode->i_mutex: down
 * BKL held [before 2.5.x]
 */
struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
{
	char *name, *value;
	struct posix_acl *acl;
	int size;
	int retval;

	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) {
			error = posix_acl_equiv_mode(acl, &inode->i_mode);
			if (error < 0)
				return error;
			else {
				if (error == 0)
					acl = NULL;
			}
		}
		break;
	case ACL_TYPE_DEFAULT:
		name = 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) {
		/* 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 */
		err = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
		if (err < 0)
			return err;

		/* If we need an ACL.. */
		if (err > 0)
			err = reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS, acl);
	      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 reiserfs_transaction_handle th;
	struct posix_acl *acl;
	size_t size;
	int depth;
	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_write_unlock(inode->i_sb);
	acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
	reiserfs_write_lock(inode->i_sb);
	if (!acl)
		return 0;
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	error = posix_acl_chmod(&acl, GFP_NOFS, inode->i_mode);
	if (error)
		return error;

	size = reiserfs_xattr_nblocks(inode, reiserfs_acl_size(acl->a_count));
	depth = reiserfs_write_lock_once(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, acl);
		error2 = journal_end(&th, inode->i_sb, size * 2);
		if (error2)
			error = error2;
	}
	reiserfs_write_unlock_once(inode->i_sb, depth);
	posix_acl_release(acl);
	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;
}

const 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;
}

const 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>
1da177e4 LT	3	#include <linux/posix_acl.h>
f466c6fd	4	#include "reiserfs.h"
1da177e4 LT	5	#include <linux/errno.h>
	6	#include <linux/pagemap.h>
	7	#include <linux/xattr.h>
5a0e3ad6	8	#include <linux/slab.h>
9a59f452	9	#include <linux/posix_acl_xattr.h>
c45ac888	10	#include "xattr.h"
a3063ab8	11	#include "acl.h"
1da177e4 LT	12	#include <asm/uaccess.h>
1da177e4 LT	13
0ab2621e JM	14	static int reiserfs_set_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	15	struct inode *inode, int type,
bd4c625c	16	struct posix_acl *acl);
1da177e4 LT	17
1da177e4 LT	18	static int
431547b3 CH	19	posix_acl_set(struct dentry dentry, const char name, const void *value,
431547b3 CH	20	size_t size, int flags, int type)
1da177e4	21	{
431547b3	22	struct inode *inode = dentry->d_inode;
1da177e4	23	struct posix_acl *acl;
0ab2621e JM	24	int error, error2;
	25	struct reiserfs_transaction_handle th;
	26	size_t jcreate_blocks;
1da177e4 LT	27	if (!reiserfs_posixacl(inode->i_sb))
1da177e4 LT	28	return -EOPNOTSUPP;
2e149670	29	if (!inode_owner_or_capable(inode))
1da177e4 LT	30	return -EPERM;
	31
	32	if (value) {
5f3a4a28	33	acl = posix_acl_from_xattr(&init_user_ns, value, size);
1da177e4 LT	34	if (IS_ERR(acl)) {
	35	return PTR_ERR(acl);
	36	} else if (acl) {
	37	error = posix_acl_valid(acl);
	38	if (error)
	39	goto release_and_out;
	40	}
	41	} else
	42	acl = NULL;
	43
0ab2621e JM	44	/* Pessimism: We can't assume that anything from the xattr root up
	45	* has been created. */
	46
	47	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
	48	reiserfs_xattr_nblocks(inode, size) * 2;
	49
	50	reiserfs_write_lock(inode->i_sb);
	51	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
	52	if (error == 0) {
	53	error = reiserfs_set_acl(&th, inode, type, acl);
	54	error2 = journal_end(&th, inode->i_sb, jcreate_blocks);
	55	if (error2)
	56	error = error2;
	57	}
	58	reiserfs_write_unlock(inode->i_sb);
1da177e4	59
bd4c625c	60	release_and_out:
1da177e4 LT	61	posix_acl_release(acl);
	62	return error;
	63	}
	64
1da177e4	65	static int
431547b3 CH	66	posix_acl_get(struct dentry dentry, const char name, void *buffer,
431547b3 CH	67	size_t size, int type)
1da177e4 LT	68	{
	69	struct posix_acl *acl;
	70	int error;
	71
431547b3	72	if (!reiserfs_posixacl(dentry->d_sb))
1da177e4 LT	73	return -EOPNOTSUPP;
1da177e4 LT	74
431547b3	75	acl = reiserfs_get_acl(dentry->d_inode, type);
1da177e4 LT	76	if (IS_ERR(acl))
	77	return PTR_ERR(acl);
	78	if (acl == NULL)
	79	return -ENODATA;
5f3a4a28	80	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
1da177e4 LT	81	posix_acl_release(acl);
	82
	83	return error;
	84	}
	85
1da177e4 LT	86	/*
	87	* Convert from filesystem to in-memory representation.
	88	*/
bd4c625c	89	static struct posix_acl posix_acl_from_disk(const void value, size_t size)
1da177e4 LT	90	{
	91	const char end = (char )value + size;
	92	int n, count;
	93	struct posix_acl *acl;
	94
	95	if (!value)
	96	return NULL;
	97	if (size < sizeof(reiserfs_acl_header))
bd4c625c LT	98	return ERR_PTR(-EINVAL);
bd4c625c LT	99	if (((reiserfs_acl_header *) value)->a_version !=
1da177e4 LT	100	cpu_to_le32(REISERFS_ACL_VERSION))
	101	return ERR_PTR(-EINVAL);
	102	value = (char *)value + sizeof(reiserfs_acl_header);
	103	count = reiserfs_acl_count(size);
	104	if (count < 0)
	105	return ERR_PTR(-EINVAL);
	106	if (count == 0)
	107	return NULL;
	108	acl = posix_acl_alloc(count, GFP_NOFS);
	109	if (!acl)
	110	return ERR_PTR(-ENOMEM);
bd4c625c LT	111	for (n = 0; n < count; n++) {
bd4c625c LT	112	reiserfs_acl_entry entry = (reiserfs_acl_entry ) value;
1da177e4 LT	113	if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
1da177e4 LT	114	goto fail;
bd4c625c	115	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
1da177e4	116	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
bd4c625c LT	117	switch (acl->a_entries[n].e_tag) {
	118	case ACL_USER_OBJ:
	119	case ACL_GROUP_OBJ:
	120	case ACL_MASK:
	121	case ACL_OTHER:
	122	value = (char *)value +
	123	sizeof(reiserfs_acl_entry_short);
bd4c625c LT	124	break;
	125
	126	case ACL_USER:
df814654 EB	127	value = (char *)value + sizeof(reiserfs_acl_entry);
	128	if ((char *)value > end)
	129	goto fail;
	130	acl->a_entries[n].e_uid =
	131	make_kuid(&init_user_ns,
	132	le32_to_cpu(entry->e_id));
	133	break;
bd4c625c LT	134	case ACL_GROUP:
	135	value = (char *)value + sizeof(reiserfs_acl_entry);
	136	if ((char *)value > end)
1da177e4	137	goto fail;
df814654 EB	138	acl->a_entries[n].e_gid =
	139	make_kgid(&init_user_ns,
	140	le32_to_cpu(entry->e_id));
bd4c625c LT	141	break;
	142
	143	default:
	144	goto fail;
1da177e4 LT	145	}
	146	}
	147	if (value != end)
	148	goto fail;
	149	return acl;
	150
bd4c625c	151	fail:
1da177e4 LT	152	posix_acl_release(acl);
	153	return ERR_PTR(-EINVAL);
	154	}
	155
	156	/*
	157	* Convert from in-memory to filesystem representation.
	158	*/
bd4c625c	159	static void posix_acl_to_disk(const struct posix_acl acl, size_t * size)
1da177e4 LT	160	{
	161	reiserfs_acl_header *ext_acl;
	162	char *e;
	163	int n;
	164
	165	*size = reiserfs_acl_size(acl->a_count);
5cbded58	166	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
bd4c625c LT	167	acl->a_count *
	168	sizeof(reiserfs_acl_entry),
	169	GFP_NOFS);
1da177e4 LT	170	if (!ext_acl)
	171	return ERR_PTR(-ENOMEM);
	172	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	173	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
bd4c625c	174	for (n = 0; n < acl->a_count; n++) {
df814654	175	const struct posix_acl_entry *acl_e = &acl->a_entries[n];
bd4c625c LT	176	reiserfs_acl_entry entry = (reiserfs_acl_entry ) e;
bd4c625c LT	177	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
1da177e4	178	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
bd4c625c LT	179	switch (acl->a_entries[n].e_tag) {
bd4c625c LT	180	case ACL_USER:
df814654 EB	181	entry->e_id = cpu_to_le32(
	182	from_kuid(&init_user_ns, acl_e->e_uid));
	183	e += sizeof(reiserfs_acl_entry);
	184	break;
bd4c625c	185	case ACL_GROUP:
df814654 EB	186	entry->e_id = cpu_to_le32(
df814654 EB	187	from_kgid(&init_user_ns, acl_e->e_gid));
bd4c625c LT	188	e += sizeof(reiserfs_acl_entry);
	189	break;
	190
	191	case ACL_USER_OBJ:
	192	case ACL_GROUP_OBJ:
	193	case ACL_MASK:
	194	case ACL_OTHER:
	195	e += sizeof(reiserfs_acl_entry_short);
	196	break;
	197
	198	default:
	199	goto fail;
1da177e4 LT	200	}
	201	}
	202	return (char *)ext_acl;
	203
bd4c625c	204	fail:
1da177e4 LT	205	kfree(ext_acl);
	206	return ERR_PTR(-EINVAL);
	207	}
	208
	209	/*
	210	* Inode operation get_posix_acl().
	211	*
1b1dcc1b	212	* inode->i_mutex: down
1da177e4 LT	213	* BKL held [before 2.5.x]
1da177e4 LT	214	*/
bd4c625c	215	struct posix_acl reiserfs_get_acl(struct inode inode, int type)
1da177e4 LT	216	{
1da177e4 LT	217	char name, value;
073aaa1b	218	struct posix_acl *acl;
3cdc409c	219	int size;
1da177e4	220	int retval;
bd4c625c	221
073aaa1b AV	222	acl = get_cached_acl(inode, type);
	223	if (acl != ACL_NOT_CACHED)
	224	return acl;
	225
bd4c625c LT	226	switch (type) {
	227	case ACL_TYPE_ACCESS:
	228	name = POSIX_ACL_XATTR_ACCESS;
bd4c625c LT	229	break;
	230	case ACL_TYPE_DEFAULT:
	231	name = POSIX_ACL_XATTR_DEFAULT;
bd4c625c LT	232	break;
bd4c625c LT	233	default:
073aaa1b	234	BUG();
bd4c625c LT	235	}
bd4c625c LT	236
bd4c625c	237	size = reiserfs_xattr_get(inode, name, NULL, 0);
3cdc409c	238	if (size < 0) {
bd4c625c	239	if (size == -ENODATA \|\| size == -ENOSYS) {
073aaa1b	240	set_cached_acl(inode, type, NULL);
bd4c625c LT	241	return NULL;
	242	}
	243	return ERR_PTR(size);
	244	}
1da177e4	245
bd4c625c LT	246	value = kmalloc(size, GFP_NOFS);
	247	if (!value)
	248	return ERR_PTR(-ENOMEM);
1da177e4 LT	249
	250	retval = reiserfs_xattr_get(inode, name, value, size);
	251	if (retval == -ENODATA \|\| retval == -ENOSYS) {
	252	/* This shouldn't actually happen as it should have
	253	been caught above.. but just in case */
	254	acl = NULL;
bd4c625c	255	} else if (retval < 0) {
1da177e4 LT	256	acl = ERR_PTR(retval);
	257	} else {
	258	acl = posix_acl_from_disk(value, retval);
bd4c625c	259	}
073aaa1b AV	260	if (!IS_ERR(acl))
073aaa1b AV	261	set_cached_acl(inode, type, acl);
1da177e4 LT	262
	263	kfree(value);
	264	return acl;
	265	}
	266
	267	/*
	268	* Inode operation set_posix_acl().
	269	*
1b1dcc1b	270	* inode->i_mutex: down
1da177e4 LT	271	* BKL held [before 2.5.x]
	272	*/
	273	static int
0ab2621e JM	274	reiserfs_set_acl(struct reiserfs_transaction_handle th, struct inode inode,
0ab2621e JM	275	int type, struct posix_acl *acl)
1da177e4	276	{
bd4c625c	277	char *name;
1da177e4	278	void *value = NULL;
48b32a35	279	size_t size = 0;
1da177e4	280	int error;
1da177e4 LT	281
	282	if (S_ISLNK(inode->i_mode))
	283	return -EOPNOTSUPP;
	284
bd4c625c LT	285	switch (type) {
	286	case ACL_TYPE_ACCESS:
	287	name = POSIX_ACL_XATTR_ACCESS;
bd4c625c	288	if (acl) {
d6952123	289	error = posix_acl_equiv_mode(acl, &inode->i_mode);
bd4c625c LT	290	if (error < 0)
	291	return error;
	292	else {
bd4c625c LT	293	if (error == 0)
	294	acl = NULL;
	295	}
	296	}
	297	break;
	298	case ACL_TYPE_DEFAULT:
	299	name = POSIX_ACL_XATTR_DEFAULT;
bd4c625c LT	300	if (!S_ISDIR(inode->i_mode))
	301	return acl ? -EACCES : 0;
	302	break;
	303	default:
	304	return -EINVAL;
	305	}
	306
	307	if (acl) {
	308	value = posix_acl_to_disk(acl, &size);
	309	if (IS_ERR(value))
	310	return (int)PTR_ERR(value);
48b32a35 JM	311	}
48b32a35 JM	312
0ab2621e	313	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);
48b32a35 JM	314
	315	/*
	316	* Ensure that the inode gets dirtied if we're only using
	317	* the mode bits and an old ACL didn't exist. We don't need
	318	* to check if the inode is hashed here since we won't get
	319	* called by reiserfs_inherit_default_acl().
	320	*/
	321	if (error == -ENODATA) {
	322	error = 0;
	323	if (type == ACL_TYPE_ACCESS) {
	324	inode->i_ctime = CURRENT_TIME_SEC;
bd4c625c	325	mark_inode_dirty(inode);
bd4c625c LT	326	}
bd4c625c LT	327	}
1da177e4	328
833d304b	329	kfree(value);
1da177e4	330
d984561b	331	if (!error)
073aaa1b	332	set_cached_acl(inode, type, acl);
1da177e4 LT	333
	334	return error;
	335	}
	336
1b1dcc1b	337	/* dir->i_mutex: locked,
1da177e4 LT	338	* inode is new and not released into the wild yet */
1da177e4 LT	339	int
0ab2621e JM	340	reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
0ab2621e JM	341	struct inode dir, struct dentry dentry,
bd4c625c	342	struct inode *inode)
1da177e4	343	{
bd4c625c LT	344	struct posix_acl *acl;
	345	int err = 0;
	346
	347	/* ACLs only get applied to files and directories */
	348	if (S_ISLNK(inode->i_mode))
	349	return 0;
	350
	351	/* ACLs can only be used on "new" objects, so if it's an old object
	352	* there is nothing to inherit from */
	353	if (get_inode_sd_version(dir) == STAT_DATA_V1)
	354	goto apply_umask;
	355
	356	/* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
	357	* would be useless since permissions are ignored, and a pain because
	358	* it introduces locking cycles */
6dfede69 JM	359	if (IS_PRIVATE(dir)) {
6dfede69 JM	360	inode->i_flags \|= S_PRIVATE;
bd4c625c LT	361	goto apply_umask;
	362	}
	363
	364	acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
7a77b15d	365	if (IS_ERR(acl))
bd4c625c	366	return PTR_ERR(acl);
bd4c625c LT	367
bd4c625c LT	368	if (acl) {
bd4c625c LT	369	/* Copy the default ACL to the default ACL of a new directory */
bd4c625c LT	370	if (S_ISDIR(inode->i_mode)) {
0ab2621e JM	371	err = reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
0ab2621e JM	372	acl);
bd4c625c LT	373	if (err)
	374	goto cleanup;
	375	}
	376
	377	/* Now we reconcile the new ACL and the mode,
	378	potentially modifying both */
d3fb6120	379	err = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
826cae2f AV	380	if (err < 0)
826cae2f AV	381	return err;
bd4c625c	382
826cae2f AV	383	/* If we need an ACL.. */
	384	if (err > 0)
	385	err = reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS, acl);
bd4c625c LT	386	cleanup:
	387	posix_acl_release(acl);
	388	} else {
	389	apply_umask:
	390	/* no ACL, apply umask */
ce3b0f8d	391	inode->i_mode &= ~current_umask();
bd4c625c LT	392	}
	393
	394	return err;
1da177e4 LT	395	}
1da177e4 LT	396
0ab2621e JM	397	/* This is used to cache the default acl before a new object is created.
	398	* The biggest reason for this is to get an idea of how many blocks will
	399	* actually be required for the create operation if we must inherit an ACL.
	400	* An ACL write can add up to 3 object creations and an additional file write
	401	* so we'd prefer not to reserve that many blocks in the journal if we can.
	402	* It also has the advantage of not loading the ACL with a transaction open,
	403	* this may seem silly, but if the owner of the directory is doing the
	404	* creation, the ACL may not be loaded since the permissions wouldn't require
	405	* it.
	406	* We return the number of blocks required for the transaction.
	407	*/
bd4c625c	408	int reiserfs_cache_default_acl(struct inode *inode)
1da177e4	409	{
0ab2621e JM	410	struct posix_acl *acl;
	411	int nblocks = 0;
	412
	413	if (IS_PRIVATE(inode))
	414	return 0;
	415
	416	acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
	417
	418	if (acl && !IS_ERR(acl)) {
	419	int size = reiserfs_acl_size(acl->a_count);
	420
	421	/* Other xattrs can be created during inode creation. We don't
	422	* want to claim too many blocks, so we check to see if we
	423	* we need to create the tree to the xattrs, and then we
	424	* just want two files. */
	425	nblocks = reiserfs_xattr_jcreate_nblocks(inode);
	426	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	427
	428	REISERFS_I(inode)->i_flags \|= i_has_xattr_dir;
	429
	430	/* We need to account for writes + bitmaps for two files */
	431	nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
	432	posix_acl_release(acl);
bd4c625c LT	433	}
bd4c625c LT	434
0ab2621e	435	return nblocks;
1da177e4 LT	436	}
1da177e4 LT	437
bd4c625c	438	int reiserfs_acl_chmod(struct inode *inode)
1da177e4	439	{
bc26ab5f AV	440	struct reiserfs_transaction_handle th;
	441	struct posix_acl *acl;
	442	size_t size;
	443	int depth;
bd4c625c	444	int error;
1da177e4	445
bd4c625c LT	446	if (S_ISLNK(inode->i_mode))
bd4c625c LT	447	return -EOPNOTSUPP;
1da177e4	448
bd4c625c LT	449	if (get_inode_sd_version(inode) == STAT_DATA_V1 \|\|
	450	!reiserfs_posixacl(inode->i_sb)) {
	451	return 0;
1da177e4 LT	452	}
1da177e4 LT	453
6c287054	454	reiserfs_write_unlock(inode->i_sb);
bd4c625c	455	acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
6c287054	456	reiserfs_write_lock(inode->i_sb);
bd4c625c LT	457	if (!acl)
	458	return 0;
	459	if (IS_ERR(acl))
	460	return PTR_ERR(acl);
bc26ab5f AV	461	error = posix_acl_chmod(&acl, GFP_NOFS, inode->i_mode);
	462	if (error)
	463	return error;
	464
	465	size = reiserfs_xattr_nblocks(inode, reiserfs_acl_size(acl->a_count));
	466	depth = reiserfs_write_lock_once(inode->i_sb);
	467	error = journal_begin(&th, inode->i_sb, size * 2);
0ab2621e	468	if (!error) {
bc26ab5f AV	469	int error2;
	470	error = reiserfs_set_acl(&th, inode, ACL_TYPE_ACCESS, acl);
	471	error2 = journal_end(&th, inode->i_sb, size * 2);
	472	if (error2)
	473	error = error2;
0ab2621e	474	}
bc26ab5f AV	475	reiserfs_write_unlock_once(inode->i_sb, depth);
bc26ab5f AV	476	posix_acl_release(acl);
bd4c625c	477	return error;
1da177e4 LT	478	}
1da177e4 LT	479
431547b3	480	static size_t posix_acl_access_list(struct dentry dentry, char list,
48b32a35	481	size_t list_size, const char *name,
431547b3	482	size_t name_len, int type)
1da177e4	483	{
48b32a35	484	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
431547b3	485	if (!reiserfs_posixacl(dentry->d_sb))
bd4c625c	486	return 0;
48b32a35 JM	487	if (list && size <= list_size)
	488	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	489	return size;
1da177e4 LT	490	}
1da177e4 LT	491
94d09a98	492	const struct xattr_handler reiserfs_posix_acl_access_handler = {
9a59f452	493	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3 CH	494	.flags = ACL_TYPE_ACCESS,
	495	.get = posix_acl_get,
	496	.set = posix_acl_set,
1da177e4 LT	497	.list = posix_acl_access_list,
	498	};
	499
431547b3	500	static size_t posix_acl_default_list(struct dentry dentry, char list,
48b32a35	501	size_t list_size, const char *name,
431547b3	502	size_t name_len, int type)
1da177e4	503	{
48b32a35	504	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
431547b3	505	if (!reiserfs_posixacl(dentry->d_sb))
bd4c625c	506	return 0;
48b32a35 JM	507	if (list && size <= list_size)
	508	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	509	return size;
1da177e4 LT	510	}
1da177e4 LT	511
94d09a98	512	const struct xattr_handler reiserfs_posix_acl_default_handler = {
9a59f452	513	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3 CH	514	.flags = ACL_TYPE_DEFAULT,
	515	.get = posix_acl_get,
	516	.set = posix_acl_set,
1da177e4 LT	517	.list = posix_acl_default_list,
1da177e4 LT	518	};