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@@ -1,874 +0,0 @@
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-/*
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- * Copyright (c) 2001-2002,2005 Silicon Graphics, Inc.
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- * All Rights Reserved.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it would be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write the Free Software Foundation,
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- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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- */
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-#include "xfs.h"
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-#include "xfs_fs.h"
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-#include "xfs_types.h"
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-#include "xfs_bit.h"
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-#include "xfs_inum.h"
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-#include "xfs_ag.h"
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-#include "xfs_dir2.h"
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-#include "xfs_bmap_btree.h"
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-#include "xfs_alloc_btree.h"
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-#include "xfs_ialloc_btree.h"
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-#include "xfs_dir2_sf.h"
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-#include "xfs_attr_sf.h"
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-#include "xfs_dinode.h"
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-#include "xfs_inode.h"
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-#include "xfs_btree.h"
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-#include "xfs_acl.h"
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-#include "xfs_attr.h"
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-#include "xfs_vnodeops.h"
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-
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-#include <linux/capability.h>
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-#include <linux/posix_acl_xattr.h>
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-
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-STATIC int xfs_acl_setmode(struct inode *, xfs_acl_t *, int *);
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-STATIC void xfs_acl_filter_mode(mode_t, xfs_acl_t *);
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-STATIC void xfs_acl_get_endian(xfs_acl_t *);
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-STATIC int xfs_acl_access(uid_t, gid_t, xfs_acl_t *, mode_t, cred_t *);
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-STATIC int xfs_acl_invalid(xfs_acl_t *);
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-STATIC void xfs_acl_sync_mode(mode_t, xfs_acl_t *);
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-STATIC void xfs_acl_get_attr(struct inode *, xfs_acl_t *, int, int, int *);
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-STATIC void xfs_acl_set_attr(struct inode *, xfs_acl_t *, int, int *);
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-STATIC int xfs_acl_allow_set(struct inode *, int);
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-
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-kmem_zone_t *xfs_acl_zone;
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-
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-
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-/*
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- * Test for existence of access ACL attribute as efficiently as possible.
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- */
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-int
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-xfs_acl_vhasacl_access(
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- struct inode *vp)
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-{
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- int error;
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-
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- xfs_acl_get_attr(vp, NULL, _ACL_TYPE_ACCESS, ATTR_KERNOVAL, &error);
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- return (error == 0);
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-}
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-
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-/*
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- * Test for existence of default ACL attribute as efficiently as possible.
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- */
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-int
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-xfs_acl_vhasacl_default(
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- struct inode *vp)
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-{
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- int error;
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-
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- if (!S_ISDIR(vp->i_mode))
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- return 0;
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- xfs_acl_get_attr(vp, NULL, _ACL_TYPE_DEFAULT, ATTR_KERNOVAL, &error);
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- return (error == 0);
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-}
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-
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-/*
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- * Convert from extended attribute representation to in-memory for XFS.
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- */
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-STATIC int
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-posix_acl_xattr_to_xfs(
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- posix_acl_xattr_header *src,
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- size_t size,
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- xfs_acl_t *dest)
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-{
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- posix_acl_xattr_entry *src_entry;
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- xfs_acl_entry_t *dest_entry;
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- int n;
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-
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- if (!src || !dest)
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- return EINVAL;
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-
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- if (size < sizeof(posix_acl_xattr_header))
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- return EINVAL;
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-
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- if (src->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
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- return EOPNOTSUPP;
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-
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- memset(dest, 0, sizeof(xfs_acl_t));
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- dest->acl_cnt = posix_acl_xattr_count(size);
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- if (dest->acl_cnt < 0 || dest->acl_cnt > XFS_ACL_MAX_ENTRIES)
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- return EINVAL;
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-
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- /*
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- * acl_set_file(3) may request that we set default ACLs with
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- * zero length -- defend (gracefully) against that here.
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- */
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- if (!dest->acl_cnt)
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- return 0;
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-
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- src_entry = (posix_acl_xattr_entry *)((char *)src + sizeof(*src));
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- dest_entry = &dest->acl_entry[0];
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-
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- for (n = 0; n < dest->acl_cnt; n++, src_entry++, dest_entry++) {
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- dest_entry->ae_perm = le16_to_cpu(src_entry->e_perm);
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- if (_ACL_PERM_INVALID(dest_entry->ae_perm))
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- return EINVAL;
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- dest_entry->ae_tag = le16_to_cpu(src_entry->e_tag);
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- switch(dest_entry->ae_tag) {
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- case ACL_USER:
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- case ACL_GROUP:
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- dest_entry->ae_id = le32_to_cpu(src_entry->e_id);
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- break;
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- case ACL_USER_OBJ:
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- case ACL_GROUP_OBJ:
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- case ACL_MASK:
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- case ACL_OTHER:
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- dest_entry->ae_id = ACL_UNDEFINED_ID;
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- break;
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- default:
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- return EINVAL;
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- }
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- }
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- if (xfs_acl_invalid(dest))
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- return EINVAL;
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-
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- return 0;
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-}
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-
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-/*
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- * Comparison function called from xfs_sort().
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- * Primary key is ae_tag, secondary key is ae_id.
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- */
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-STATIC int
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-xfs_acl_entry_compare(
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- const void *va,
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- const void *vb)
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-{
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- xfs_acl_entry_t *a = (xfs_acl_entry_t *)va,
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- *b = (xfs_acl_entry_t *)vb;
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-
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- if (a->ae_tag == b->ae_tag)
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- return (a->ae_id - b->ae_id);
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- return (a->ae_tag - b->ae_tag);
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-}
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-
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-/*
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- * Convert from in-memory XFS to extended attribute representation.
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- */
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-STATIC int
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-posix_acl_xfs_to_xattr(
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- xfs_acl_t *src,
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- posix_acl_xattr_header *dest,
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- size_t size)
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-{
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- int n;
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- size_t new_size = posix_acl_xattr_size(src->acl_cnt);
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- posix_acl_xattr_entry *dest_entry;
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- xfs_acl_entry_t *src_entry;
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-
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- if (size < new_size)
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- return -ERANGE;
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-
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- /* Need to sort src XFS ACL by <ae_tag,ae_id> */
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- xfs_sort(src->acl_entry, src->acl_cnt, sizeof(src->acl_entry[0]),
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- xfs_acl_entry_compare);
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-
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- dest->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION);
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- dest_entry = &dest->a_entries[0];
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- src_entry = &src->acl_entry[0];
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- for (n = 0; n < src->acl_cnt; n++, dest_entry++, src_entry++) {
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- dest_entry->e_perm = cpu_to_le16(src_entry->ae_perm);
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- if (_ACL_PERM_INVALID(src_entry->ae_perm))
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- return -EINVAL;
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- dest_entry->e_tag = cpu_to_le16(src_entry->ae_tag);
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- switch (src_entry->ae_tag) {
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- case ACL_USER:
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- case ACL_GROUP:
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- dest_entry->e_id = cpu_to_le32(src_entry->ae_id);
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- break;
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- case ACL_USER_OBJ:
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- case ACL_GROUP_OBJ:
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- case ACL_MASK:
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- case ACL_OTHER:
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- dest_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
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- break;
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- default:
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- return -EINVAL;
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- }
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- }
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- return new_size;
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-}
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-
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-int
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-xfs_acl_vget(
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- struct inode *vp,
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- void *acl,
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- size_t size,
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- int kind)
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-{
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- int error;
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- xfs_acl_t *xfs_acl = NULL;
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- posix_acl_xattr_header *ext_acl = acl;
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- int flags = 0;
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-
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- if(size) {
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- if (!(_ACL_ALLOC(xfs_acl))) {
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- error = ENOMEM;
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- goto out;
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- }
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- memset(xfs_acl, 0, sizeof(xfs_acl_t));
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- } else
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- flags = ATTR_KERNOVAL;
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-
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- xfs_acl_get_attr(vp, xfs_acl, kind, flags, &error);
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- if (error)
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- goto out;
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-
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- if (!size) {
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- error = -posix_acl_xattr_size(XFS_ACL_MAX_ENTRIES);
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- } else {
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- if (xfs_acl_invalid(xfs_acl)) {
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- error = EINVAL;
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- goto out;
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- }
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- if (kind == _ACL_TYPE_ACCESS)
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- xfs_acl_sync_mode(XFS_I(vp)->i_d.di_mode, xfs_acl);
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- error = -posix_acl_xfs_to_xattr(xfs_acl, ext_acl, size);
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- }
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-out:
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- if(xfs_acl)
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- _ACL_FREE(xfs_acl);
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- return -error;
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-}
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-
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-int
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-xfs_acl_vremove(
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- struct inode *vp,
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- int kind)
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-{
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- int error;
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-
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- error = xfs_acl_allow_set(vp, kind);
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- if (!error) {
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- error = xfs_attr_remove(XFS_I(vp),
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- kind == _ACL_TYPE_DEFAULT?
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- SGI_ACL_DEFAULT: SGI_ACL_FILE,
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- ATTR_ROOT);
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- if (error == ENOATTR)
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- error = 0; /* 'scool */
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- }
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- return -error;
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-}
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-
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-int
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-xfs_acl_vset(
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- struct inode *vp,
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- void *acl,
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- size_t size,
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- int kind)
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-{
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- posix_acl_xattr_header *ext_acl = acl;
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- xfs_acl_t *xfs_acl;
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- int error;
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- int basicperms = 0; /* more than std unix perms? */
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-
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- if (!acl)
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- return -EINVAL;
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-
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- if (!(_ACL_ALLOC(xfs_acl)))
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- return -ENOMEM;
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-
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- error = posix_acl_xattr_to_xfs(ext_acl, size, xfs_acl);
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- if (error) {
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- _ACL_FREE(xfs_acl);
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- return -error;
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- }
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- if (!xfs_acl->acl_cnt) {
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- _ACL_FREE(xfs_acl);
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- return 0;
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- }
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-
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- error = xfs_acl_allow_set(vp, kind);
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-
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- /* Incoming ACL exists, set file mode based on its value */
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- if (!error && kind == _ACL_TYPE_ACCESS)
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- error = xfs_acl_setmode(vp, xfs_acl, &basicperms);
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-
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- if (error)
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- goto out;
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-
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- /*
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- * If we have more than std unix permissions, set up the actual attr.
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- * Otherwise, delete any existing attr. This prevents us from
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- * having actual attrs for permissions that can be stored in the
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- * standard permission bits.
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- */
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- if (!basicperms) {
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- xfs_acl_set_attr(vp, xfs_acl, kind, &error);
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- } else {
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- error = -xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
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- }
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-
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-out:
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- _ACL_FREE(xfs_acl);
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- return -error;
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-}
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-
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-int
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-xfs_acl_iaccess(
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- xfs_inode_t *ip,
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- mode_t mode,
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- cred_t *cr)
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-{
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- xfs_acl_t *acl;
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- int rval;
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- struct xfs_name acl_name = {SGI_ACL_FILE, SGI_ACL_FILE_SIZE};
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-
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- if (!(_ACL_ALLOC(acl)))
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- return -1;
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-
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- /* If the file has no ACL return -1. */
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- rval = sizeof(xfs_acl_t);
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- if (xfs_attr_fetch(ip, &acl_name, (char *)acl, &rval, ATTR_ROOT)) {
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- _ACL_FREE(acl);
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- return -1;
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- }
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- xfs_acl_get_endian(acl);
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-
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- /* If the file has an empty ACL return -1. */
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- if (acl->acl_cnt == XFS_ACL_NOT_PRESENT) {
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- _ACL_FREE(acl);
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- return -1;
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- }
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-
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- /* Synchronize ACL with mode bits */
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- xfs_acl_sync_mode(ip->i_d.di_mode, acl);
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-
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- rval = xfs_acl_access(ip->i_d.di_uid, ip->i_d.di_gid, acl, mode, cr);
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- _ACL_FREE(acl);
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- return rval;
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-}
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-
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-STATIC int
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-xfs_acl_allow_set(
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- struct inode *vp,
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- int kind)
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-{
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- if (vp->i_flags & (S_IMMUTABLE|S_APPEND))
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- return EPERM;
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- if (kind == _ACL_TYPE_DEFAULT && !S_ISDIR(vp->i_mode))
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- return ENOTDIR;
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- if (vp->i_sb->s_flags & MS_RDONLY)
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- return EROFS;
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- if (XFS_I(vp)->i_d.di_uid != current_fsuid() && !capable(CAP_FOWNER))
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- return EPERM;
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- return 0;
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-}
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-
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-/*
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- * Note: cr is only used here for the capability check if the ACL test fails.
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- * It is not used to find out the credentials uid or groups etc, as was
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- * done in IRIX. It is assumed that the uid and groups for the current
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- * thread are taken from "current" instead of the cr parameter.
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- */
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-STATIC int
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-xfs_acl_access(
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- uid_t fuid,
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- gid_t fgid,
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- xfs_acl_t *fap,
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- mode_t md,
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- cred_t *cr)
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-{
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- xfs_acl_entry_t matched;
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- int i, allows;
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- int maskallows = -1; /* true, but not 1, either */
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- int seen_userobj = 0;
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-
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- matched.ae_tag = 0; /* Invalid type */
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- matched.ae_perm = 0;
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-
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- for (i = 0; i < fap->acl_cnt; i++) {
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- /*
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- * Break out if we've got a user_obj entry or
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- * a user entry and the mask (and have processed USER_OBJ)
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- */
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- if (matched.ae_tag == ACL_USER_OBJ)
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- break;
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- if (matched.ae_tag == ACL_USER) {
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- if (maskallows != -1 && seen_userobj)
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- break;
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|
|
- if (fap->acl_entry[i].ae_tag != ACL_MASK &&
|
|
|
- fap->acl_entry[i].ae_tag != ACL_USER_OBJ)
|
|
|
- continue;
|
|
|
- }
|
|
|
- /* True if this entry allows the requested access */
|
|
|
- allows = ((fap->acl_entry[i].ae_perm & md) == md);
|
|
|
-
|
|
|
- switch (fap->acl_entry[i].ae_tag) {
|
|
|
- case ACL_USER_OBJ:
|
|
|
- seen_userobj = 1;
|
|
|
- if (fuid != current_fsuid())
|
|
|
- continue;
|
|
|
- matched.ae_tag = ACL_USER_OBJ;
|
|
|
- matched.ae_perm = allows;
|
|
|
- break;
|
|
|
- case ACL_USER:
|
|
|
- if (fap->acl_entry[i].ae_id != current_fsuid())
|
|
|
- continue;
|
|
|
- matched.ae_tag = ACL_USER;
|
|
|
- matched.ae_perm = allows;
|
|
|
- break;
|
|
|
- case ACL_GROUP_OBJ:
|
|
|
- if ((matched.ae_tag == ACL_GROUP_OBJ ||
|
|
|
- matched.ae_tag == ACL_GROUP) && !allows)
|
|
|
- continue;
|
|
|
- if (!in_group_p(fgid))
|
|
|
- continue;
|
|
|
- matched.ae_tag = ACL_GROUP_OBJ;
|
|
|
- matched.ae_perm = allows;
|
|
|
- break;
|
|
|
- case ACL_GROUP:
|
|
|
- if ((matched.ae_tag == ACL_GROUP_OBJ ||
|
|
|
- matched.ae_tag == ACL_GROUP) && !allows)
|
|
|
- continue;
|
|
|
- if (!in_group_p(fap->acl_entry[i].ae_id))
|
|
|
- continue;
|
|
|
- matched.ae_tag = ACL_GROUP;
|
|
|
- matched.ae_perm = allows;
|
|
|
- break;
|
|
|
- case ACL_MASK:
|
|
|
- maskallows = allows;
|
|
|
- break;
|
|
|
- case ACL_OTHER:
|
|
|
- if (matched.ae_tag != 0)
|
|
|
- continue;
|
|
|
- matched.ae_tag = ACL_OTHER;
|
|
|
- matched.ae_perm = allows;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
- /*
|
|
|
- * First possibility is that no matched entry allows access.
|
|
|
- * The capability to override DAC may exist, so check for it.
|
|
|
- */
|
|
|
- switch (matched.ae_tag) {
|
|
|
- case ACL_OTHER:
|
|
|
- case ACL_USER_OBJ:
|
|
|
- if (matched.ae_perm)
|
|
|
- return 0;
|
|
|
- break;
|
|
|
- case ACL_USER:
|
|
|
- case ACL_GROUP_OBJ:
|
|
|
- case ACL_GROUP:
|
|
|
- if (maskallows && matched.ae_perm)
|
|
|
- return 0;
|
|
|
- break;
|
|
|
- case 0:
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- /* EACCES tells generic_permission to check for capability overrides */
|
|
|
- return EACCES;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * ACL validity checker.
|
|
|
- * This acl validation routine checks each ACL entry read in makes sense.
|
|
|
- */
|
|
|
-STATIC int
|
|
|
-xfs_acl_invalid(
|
|
|
- xfs_acl_t *aclp)
|
|
|
-{
|
|
|
- xfs_acl_entry_t *entry, *e;
|
|
|
- int user = 0, group = 0, other = 0, mask = 0;
|
|
|
- int mask_required = 0;
|
|
|
- int i, j;
|
|
|
-
|
|
|
- if (!aclp)
|
|
|
- goto acl_invalid;
|
|
|
-
|
|
|
- if (aclp->acl_cnt > XFS_ACL_MAX_ENTRIES)
|
|
|
- goto acl_invalid;
|
|
|
-
|
|
|
- for (i = 0; i < aclp->acl_cnt; i++) {
|
|
|
- entry = &aclp->acl_entry[i];
|
|
|
- switch (entry->ae_tag) {
|
|
|
- case ACL_USER_OBJ:
|
|
|
- if (user++)
|
|
|
- goto acl_invalid;
|
|
|
- break;
|
|
|
- case ACL_GROUP_OBJ:
|
|
|
- if (group++)
|
|
|
- goto acl_invalid;
|
|
|
- break;
|
|
|
- case ACL_OTHER:
|
|
|
- if (other++)
|
|
|
- goto acl_invalid;
|
|
|
- break;
|
|
|
- case ACL_USER:
|
|
|
- case ACL_GROUP:
|
|
|
- for (j = i + 1; j < aclp->acl_cnt; j++) {
|
|
|
- e = &aclp->acl_entry[j];
|
|
|
- if (e->ae_id == entry->ae_id &&
|
|
|
- e->ae_tag == entry->ae_tag)
|
|
|
- goto acl_invalid;
|
|
|
- }
|
|
|
- mask_required++;
|
|
|
- break;
|
|
|
- case ACL_MASK:
|
|
|
- if (mask++)
|
|
|
- goto acl_invalid;
|
|
|
- break;
|
|
|
- default:
|
|
|
- goto acl_invalid;
|
|
|
- }
|
|
|
- }
|
|
|
- if (!user || !group || !other || (mask_required && !mask))
|
|
|
- goto acl_invalid;
|
|
|
- else
|
|
|
- return 0;
|
|
|
-acl_invalid:
|
|
|
- return EINVAL;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Do ACL endian conversion.
|
|
|
- */
|
|
|
-STATIC void
|
|
|
-xfs_acl_get_endian(
|
|
|
- xfs_acl_t *aclp)
|
|
|
-{
|
|
|
- xfs_acl_entry_t *ace, *end;
|
|
|
-
|
|
|
- INT_SET(aclp->acl_cnt, ARCH_CONVERT, aclp->acl_cnt);
|
|
|
- end = &aclp->acl_entry[0]+aclp->acl_cnt;
|
|
|
- for (ace = &aclp->acl_entry[0]; ace < end; ace++) {
|
|
|
- INT_SET(ace->ae_tag, ARCH_CONVERT, ace->ae_tag);
|
|
|
- INT_SET(ace->ae_id, ARCH_CONVERT, ace->ae_id);
|
|
|
- INT_SET(ace->ae_perm, ARCH_CONVERT, ace->ae_perm);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Get the ACL from the EA and do endian conversion.
|
|
|
- */
|
|
|
-STATIC void
|
|
|
-xfs_acl_get_attr(
|
|
|
- struct inode *vp,
|
|
|
- xfs_acl_t *aclp,
|
|
|
- int kind,
|
|
|
- int flags,
|
|
|
- int *error)
|
|
|
-{
|
|
|
- int len = sizeof(xfs_acl_t);
|
|
|
-
|
|
|
- ASSERT((flags & ATTR_KERNOVAL) ? (aclp == NULL) : 1);
|
|
|
- flags |= ATTR_ROOT;
|
|
|
- *error = xfs_attr_get(XFS_I(vp),
|
|
|
- kind == _ACL_TYPE_ACCESS ?
|
|
|
- SGI_ACL_FILE : SGI_ACL_DEFAULT,
|
|
|
- (char *)aclp, &len, flags);
|
|
|
- if (*error || (flags & ATTR_KERNOVAL))
|
|
|
- return;
|
|
|
- xfs_acl_get_endian(aclp);
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Set the EA with the ACL and do endian conversion.
|
|
|
- */
|
|
|
-STATIC void
|
|
|
-xfs_acl_set_attr(
|
|
|
- struct inode *vp,
|
|
|
- xfs_acl_t *aclp,
|
|
|
- int kind,
|
|
|
- int *error)
|
|
|
-{
|
|
|
- xfs_acl_entry_t *ace, *newace, *end;
|
|
|
- xfs_acl_t *newacl;
|
|
|
- int len;
|
|
|
-
|
|
|
- if (!(_ACL_ALLOC(newacl))) {
|
|
|
- *error = ENOMEM;
|
|
|
- return;
|
|
|
- }
|
|
|
-
|
|
|
- len = sizeof(xfs_acl_t) -
|
|
|
- (sizeof(xfs_acl_entry_t) * (XFS_ACL_MAX_ENTRIES - aclp->acl_cnt));
|
|
|
- end = &aclp->acl_entry[0]+aclp->acl_cnt;
|
|
|
- for (ace = &aclp->acl_entry[0], newace = &newacl->acl_entry[0];
|
|
|
- ace < end;
|
|
|
- ace++, newace++) {
|
|
|
- INT_SET(newace->ae_tag, ARCH_CONVERT, ace->ae_tag);
|
|
|
- INT_SET(newace->ae_id, ARCH_CONVERT, ace->ae_id);
|
|
|
- INT_SET(newace->ae_perm, ARCH_CONVERT, ace->ae_perm);
|
|
|
- }
|
|
|
- INT_SET(newacl->acl_cnt, ARCH_CONVERT, aclp->acl_cnt);
|
|
|
- *error = xfs_attr_set(XFS_I(vp),
|
|
|
- kind == _ACL_TYPE_ACCESS ?
|
|
|
- SGI_ACL_FILE: SGI_ACL_DEFAULT,
|
|
|
- (char *)newacl, len, ATTR_ROOT);
|
|
|
- _ACL_FREE(newacl);
|
|
|
-}
|
|
|
-
|
|
|
-int
|
|
|
-xfs_acl_vtoacl(
|
|
|
- struct inode *vp,
|
|
|
- xfs_acl_t *access_acl,
|
|
|
- xfs_acl_t *default_acl)
|
|
|
-{
|
|
|
- int error = 0;
|
|
|
-
|
|
|
- if (access_acl) {
|
|
|
- /*
|
|
|
- * Get the Access ACL and the mode. If either cannot
|
|
|
- * be obtained for some reason, invalidate the access ACL.
|
|
|
- */
|
|
|
- xfs_acl_get_attr(vp, access_acl, _ACL_TYPE_ACCESS, 0, &error);
|
|
|
- if (error)
|
|
|
- access_acl->acl_cnt = XFS_ACL_NOT_PRESENT;
|
|
|
- else /* We have a good ACL and the file mode, synchronize. */
|
|
|
- xfs_acl_sync_mode(XFS_I(vp)->i_d.di_mode, access_acl);
|
|
|
- }
|
|
|
-
|
|
|
- if (default_acl) {
|
|
|
- xfs_acl_get_attr(vp, default_acl, _ACL_TYPE_DEFAULT, 0, &error);
|
|
|
- if (error)
|
|
|
- default_acl->acl_cnt = XFS_ACL_NOT_PRESENT;
|
|
|
- }
|
|
|
- return error;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * This function retrieves the parent directory's acl, processes it
|
|
|
- * and lets the child inherit the acl(s) that it should.
|
|
|
- */
|
|
|
-int
|
|
|
-xfs_acl_inherit(
|
|
|
- struct inode *vp,
|
|
|
- mode_t mode,
|
|
|
- xfs_acl_t *pdaclp)
|
|
|
-{
|
|
|
- xfs_acl_t *cacl;
|
|
|
- int error = 0;
|
|
|
- int basicperms = 0;
|
|
|
-
|
|
|
- /*
|
|
|
- * If the parent does not have a default ACL, or it's an
|
|
|
- * invalid ACL, we're done.
|
|
|
- */
|
|
|
- if (!vp)
|
|
|
- return 0;
|
|
|
- if (!pdaclp || xfs_acl_invalid(pdaclp))
|
|
|
- return 0;
|
|
|
-
|
|
|
- /*
|
|
|
- * Copy the default ACL of the containing directory to
|
|
|
- * the access ACL of the new file and use the mode that
|
|
|
- * was passed in to set up the correct initial values for
|
|
|
- * the u::,g::[m::], and o:: entries. This is what makes
|
|
|
- * umask() "work" with ACL's.
|
|
|
- */
|
|
|
-
|
|
|
- if (!(_ACL_ALLOC(cacl)))
|
|
|
- return ENOMEM;
|
|
|
-
|
|
|
- memcpy(cacl, pdaclp, sizeof(xfs_acl_t));
|
|
|
- xfs_acl_filter_mode(mode, cacl);
|
|
|
- error = xfs_acl_setmode(vp, cacl, &basicperms);
|
|
|
- if (error)
|
|
|
- goto out_error;
|
|
|
-
|
|
|
- /*
|
|
|
- * Set the Default and Access ACL on the file. The mode is already
|
|
|
- * set on the file, so we don't need to worry about that.
|
|
|
- *
|
|
|
- * If the new file is a directory, its default ACL is a copy of
|
|
|
- * the containing directory's default ACL.
|
|
|
- */
|
|
|
- if (S_ISDIR(vp->i_mode))
|
|
|
- xfs_acl_set_attr(vp, pdaclp, _ACL_TYPE_DEFAULT, &error);
|
|
|
- if (!error && !basicperms)
|
|
|
- xfs_acl_set_attr(vp, cacl, _ACL_TYPE_ACCESS, &error);
|
|
|
-out_error:
|
|
|
- _ACL_FREE(cacl);
|
|
|
- return error;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Set up the correct mode on the file based on the supplied ACL. This
|
|
|
- * makes sure that the mode on the file reflects the state of the
|
|
|
- * u::,g::[m::], and o:: entries in the ACL. Since the mode is where
|
|
|
- * the ACL is going to get the permissions for these entries, we must
|
|
|
- * synchronize the mode whenever we set the ACL on a file.
|
|
|
- */
|
|
|
-STATIC int
|
|
|
-xfs_acl_setmode(
|
|
|
- struct inode *vp,
|
|
|
- xfs_acl_t *acl,
|
|
|
- int *basicperms)
|
|
|
-{
|
|
|
- struct iattr iattr;
|
|
|
- xfs_acl_entry_t *ap;
|
|
|
- xfs_acl_entry_t *gap = NULL;
|
|
|
- int i, nomask = 1;
|
|
|
-
|
|
|
- *basicperms = 1;
|
|
|
-
|
|
|
- if (acl->acl_cnt == XFS_ACL_NOT_PRESENT)
|
|
|
- return 0;
|
|
|
-
|
|
|
- /*
|
|
|
- * Copy the u::, g::, o::, and m:: bits from the ACL into the
|
|
|
- * mode. The m:: bits take precedence over the g:: bits.
|
|
|
- */
|
|
|
- iattr.ia_valid = ATTR_MODE;
|
|
|
- iattr.ia_mode = XFS_I(vp)->i_d.di_mode;
|
|
|
- iattr.ia_mode &= ~(S_IRWXU|S_IRWXG|S_IRWXO);
|
|
|
- ap = acl->acl_entry;
|
|
|
- for (i = 0; i < acl->acl_cnt; ++i) {
|
|
|
- switch (ap->ae_tag) {
|
|
|
- case ACL_USER_OBJ:
|
|
|
- iattr.ia_mode |= ap->ae_perm << 6;
|
|
|
- break;
|
|
|
- case ACL_GROUP_OBJ:
|
|
|
- gap = ap;
|
|
|
- break;
|
|
|
- case ACL_MASK: /* more than just standard modes */
|
|
|
- nomask = 0;
|
|
|
- iattr.ia_mode |= ap->ae_perm << 3;
|
|
|
- *basicperms = 0;
|
|
|
- break;
|
|
|
- case ACL_OTHER:
|
|
|
- iattr.ia_mode |= ap->ae_perm;
|
|
|
- break;
|
|
|
- default: /* more than just standard modes */
|
|
|
- *basicperms = 0;
|
|
|
- break;
|
|
|
- }
|
|
|
- ap++;
|
|
|
- }
|
|
|
-
|
|
|
- /* Set the group bits from ACL_GROUP_OBJ if there's no ACL_MASK */
|
|
|
- if (gap && nomask)
|
|
|
- iattr.ia_mode |= gap->ae_perm << 3;
|
|
|
-
|
|
|
- return xfs_setattr(XFS_I(vp), &iattr, 0);
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * The permissions for the special ACL entries (u::, g::[m::], o::) are
|
|
|
- * actually stored in the file mode (if there is both a group and a mask,
|
|
|
- * the group is stored in the ACL entry and the mask is stored on the file).
|
|
|
- * This allows the mode to remain automatically in sync with the ACL without
|
|
|
- * the need for a call-back to the ACL system at every point where the mode
|
|
|
- * could change. This function takes the permissions from the specified mode
|
|
|
- * and places it in the supplied ACL.
|
|
|
- *
|
|
|
- * This implementation draws its validity from the fact that, when the ACL
|
|
|
- * was assigned, the mode was copied from the ACL.
|
|
|
- * If the mode did not change, therefore, the mode remains exactly what was
|
|
|
- * taken from the special ACL entries at assignment.
|
|
|
- * If a subsequent chmod() was done, the POSIX spec says that the change in
|
|
|
- * mode must cause an update to the ACL seen at user level and used for
|
|
|
- * access checks. Before and after a mode change, therefore, the file mode
|
|
|
- * most accurately reflects what the special ACL entries should permit/deny.
|
|
|
- *
|
|
|
- * CAVEAT: If someone sets the SGI_ACL_FILE attribute directly,
|
|
|
- * the existing mode bits will override whatever is in the
|
|
|
- * ACL. Similarly, if there is a pre-existing ACL that was
|
|
|
- * never in sync with its mode (owing to a bug in 6.5 and
|
|
|
- * before), it will now magically (or mystically) be
|
|
|
- * synchronized. This could cause slight astonishment, but
|
|
|
- * it is better than inconsistent permissions.
|
|
|
- *
|
|
|
- * The supplied ACL is a template that may contain any combination
|
|
|
- * of special entries. These are treated as place holders when we fill
|
|
|
- * out the ACL. This routine does not add or remove special entries, it
|
|
|
- * simply unites each special entry with its associated set of permissions.
|
|
|
- */
|
|
|
-STATIC void
|
|
|
-xfs_acl_sync_mode(
|
|
|
- mode_t mode,
|
|
|
- xfs_acl_t *acl)
|
|
|
-{
|
|
|
- int i, nomask = 1;
|
|
|
- xfs_acl_entry_t *ap;
|
|
|
- xfs_acl_entry_t *gap = NULL;
|
|
|
-
|
|
|
- /*
|
|
|
- * Set ACL entries. POSIX1003.1eD16 requires that the MASK
|
|
|
- * be set instead of the GROUP entry, if there is a MASK.
|
|
|
- */
|
|
|
- for (ap = acl->acl_entry, i = 0; i < acl->acl_cnt; ap++, i++) {
|
|
|
- switch (ap->ae_tag) {
|
|
|
- case ACL_USER_OBJ:
|
|
|
- ap->ae_perm = (mode >> 6) & 0x7;
|
|
|
- break;
|
|
|
- case ACL_GROUP_OBJ:
|
|
|
- gap = ap;
|
|
|
- break;
|
|
|
- case ACL_MASK:
|
|
|
- nomask = 0;
|
|
|
- ap->ae_perm = (mode >> 3) & 0x7;
|
|
|
- break;
|
|
|
- case ACL_OTHER:
|
|
|
- ap->ae_perm = mode & 0x7;
|
|
|
- break;
|
|
|
- default:
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
- /* Set the ACL_GROUP_OBJ if there's no ACL_MASK */
|
|
|
- if (gap && nomask)
|
|
|
- gap->ae_perm = (mode >> 3) & 0x7;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * When inheriting an Access ACL from a directory Default ACL,
|
|
|
- * the ACL bits are set to the intersection of the ACL default
|
|
|
- * permission bits and the file permission bits in mode. If there
|
|
|
- * are no permission bits on the file then we must not give them
|
|
|
- * the ACL. This is what what makes umask() work with ACLs.
|
|
|
- */
|
|
|
-STATIC void
|
|
|
-xfs_acl_filter_mode(
|
|
|
- mode_t mode,
|
|
|
- xfs_acl_t *acl)
|
|
|
-{
|
|
|
- int i, nomask = 1;
|
|
|
- xfs_acl_entry_t *ap;
|
|
|
- xfs_acl_entry_t *gap = NULL;
|
|
|
-
|
|
|
- /*
|
|
|
- * Set ACL entries. POSIX1003.1eD16 requires that the MASK
|
|
|
- * be merged with GROUP entry, if there is a MASK.
|
|
|
- */
|
|
|
- for (ap = acl->acl_entry, i = 0; i < acl->acl_cnt; ap++, i++) {
|
|
|
- switch (ap->ae_tag) {
|
|
|
- case ACL_USER_OBJ:
|
|
|
- ap->ae_perm &= (mode >> 6) & 0x7;
|
|
|
- break;
|
|
|
- case ACL_GROUP_OBJ:
|
|
|
- gap = ap;
|
|
|
- break;
|
|
|
- case ACL_MASK:
|
|
|
- nomask = 0;
|
|
|
- ap->ae_perm &= (mode >> 3) & 0x7;
|
|
|
- break;
|
|
|
- case ACL_OTHER:
|
|
|
- ap->ae_perm &= mode & 0x7;
|
|
|
- break;
|
|
|
- default:
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
- /* Set the ACL_GROUP_OBJ if there's no ACL_MASK */
|
|
|
- if (gap && nomask)
|
|
|
- gap->ae_perm &= (mode >> 3) & 0x7;
|
|
|
-}
|