summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_acl.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/xfs_acl.c')
-rw-r--r--fs/xfs/xfs_acl.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
new file mode 100644
index 000000000..4b641676f
--- /dev/null
+++ b/fs/xfs/xfs_acl.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright (c) 2008, Christoph Hellwig
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "xfs.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_acl.h"
+#include "xfs_attr.h"
+#include "xfs_trace.h"
+#include <linux/slab.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl_xattr.h>
+
+
+/*
+ * Locking scheme:
+ * - all ACL updates are protected by inode->i_mutex, which is taken before
+ * calling into this file.
+ */
+
+STATIC struct posix_acl *
+xfs_acl_from_disk(
+ struct xfs_acl *aclp,
+ int max_entries)
+{
+ struct posix_acl_entry *acl_e;
+ struct posix_acl *acl;
+ struct xfs_acl_entry *ace;
+ unsigned int count, i;
+
+ count = be32_to_cpu(aclp->acl_cnt);
+ if (count > max_entries)
+ return ERR_PTR(-EFSCORRUPTED);
+
+ acl = posix_acl_alloc(count, GFP_KERNEL);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < count; i++) {
+ acl_e = &acl->a_entries[i];
+ ace = &aclp->acl_entry[i];
+
+ /*
+ * The tag is 32 bits on disk and 16 bits in core.
+ *
+ * Because every access to it goes through the core
+ * format first this is not a problem.
+ */
+ acl_e->e_tag = be32_to_cpu(ace->ae_tag);
+ acl_e->e_perm = be16_to_cpu(ace->ae_perm);
+
+ switch (acl_e->e_tag) {
+ case ACL_USER:
+ acl_e->e_uid = xfs_uid_to_kuid(be32_to_cpu(ace->ae_id));
+ break;
+ case ACL_GROUP:
+ acl_e->e_gid = xfs_gid_to_kgid(be32_to_cpu(ace->ae_id));
+ break;
+ case ACL_USER_OBJ:
+ case ACL_GROUP_OBJ:
+ case ACL_MASK:
+ case ACL_OTHER:
+ break;
+ default:
+ goto fail;
+ }
+ }
+ return acl;
+
+fail:
+ posix_acl_release(acl);
+ return ERR_PTR(-EINVAL);
+}
+
+STATIC void
+xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
+{
+ const struct posix_acl_entry *acl_e;
+ struct xfs_acl_entry *ace;
+ int i;
+
+ aclp->acl_cnt = cpu_to_be32(acl->a_count);
+ for (i = 0; i < acl->a_count; i++) {
+ ace = &aclp->acl_entry[i];
+ acl_e = &acl->a_entries[i];
+
+ ace->ae_tag = cpu_to_be32(acl_e->e_tag);
+ switch (acl_e->e_tag) {
+ case ACL_USER:
+ ace->ae_id = cpu_to_be32(xfs_kuid_to_uid(acl_e->e_uid));
+ break;
+ case ACL_GROUP:
+ ace->ae_id = cpu_to_be32(xfs_kgid_to_gid(acl_e->e_gid));
+ break;
+ default:
+ ace->ae_id = cpu_to_be32(ACL_UNDEFINED_ID);
+ break;
+ }
+
+ ace->ae_perm = cpu_to_be16(acl_e->e_perm);
+ }
+}
+
+struct posix_acl *
+xfs_get_acl(struct inode *inode, int type)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct posix_acl *acl = NULL;
+ struct xfs_acl *xfs_acl;
+ unsigned char *ea_name;
+ int error;
+ int len;
+
+ trace_xfs_get_acl(ip);
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ ea_name = SGI_ACL_FILE;
+ break;
+ case ACL_TYPE_DEFAULT:
+ ea_name = SGI_ACL_DEFAULT;
+ break;
+ default:
+ BUG();
+ }
+
+ /*
+ * If we have a cached ACLs value just return it, not need to
+ * go out to the disk.
+ */
+ len = XFS_ACL_MAX_SIZE(ip->i_mount);
+ xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
+ if (!xfs_acl)
+ return ERR_PTR(-ENOMEM);
+
+ error = xfs_attr_get(ip, ea_name, (unsigned char *)xfs_acl,
+ &len, ATTR_ROOT);
+ if (error) {
+ /*
+ * If the attribute doesn't exist make sure we have a negative
+ * cache entry, for any other error assume it is transient and
+ * leave the cache entry as ACL_NOT_CACHED.
+ */
+ if (error == -ENOATTR)
+ goto out_update_cache;
+ goto out;
+ }
+
+ acl = xfs_acl_from_disk(xfs_acl, XFS_ACL_MAX_ENTRIES(ip->i_mount));
+ if (IS_ERR(acl))
+ goto out;
+
+out_update_cache:
+ set_cached_acl(inode, type, acl);
+out:
+ kmem_free(xfs_acl);
+ return acl;
+}
+
+STATIC int
+__xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ unsigned char *ea_name;
+ int error;
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ ea_name = SGI_ACL_FILE;
+ break;
+ case ACL_TYPE_DEFAULT:
+ if (!S_ISDIR(inode->i_mode))
+ return acl ? -EACCES : 0;
+ ea_name = SGI_ACL_DEFAULT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (acl) {
+ struct xfs_acl *xfs_acl;
+ int len = XFS_ACL_MAX_SIZE(ip->i_mount);
+
+ xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
+ if (!xfs_acl)
+ return -ENOMEM;
+
+ xfs_acl_to_disk(xfs_acl, acl);
+
+ /* subtract away the unused acl entries */
+ len -= sizeof(struct xfs_acl_entry) *
+ (XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);
+
+ error = xfs_attr_set(ip, ea_name, (unsigned char *)xfs_acl,
+ len, ATTR_ROOT);
+
+ kmem_free(xfs_acl);
+ } else {
+ /*
+ * A NULL ACL argument means we want to remove the ACL.
+ */
+ error = xfs_attr_remove(ip, ea_name, ATTR_ROOT);
+
+ /*
+ * If the attribute didn't exist to start with that's fine.
+ */
+ if (error == -ENOATTR)
+ error = 0;
+ }
+
+ if (!error)
+ set_cached_acl(inode, type, acl);
+ return error;
+}
+
+static int
+xfs_set_mode(struct inode *inode, umode_t mode)
+{
+ int error = 0;
+
+ if (mode != inode->i_mode) {
+ struct iattr iattr;
+
+ iattr.ia_valid = ATTR_MODE | ATTR_CTIME;
+ iattr.ia_mode = mode;
+ iattr.ia_ctime = current_fs_time(inode->i_sb);
+
+ error = xfs_setattr_nonsize(XFS_I(inode), &iattr, XFS_ATTR_NOACL);
+ }
+
+ return error;
+}
+
+static int
+xfs_acl_exists(struct inode *inode, unsigned char *name)
+{
+ int len = XFS_ACL_MAX_SIZE(XFS_M(inode->i_sb));
+
+ return (xfs_attr_get(XFS_I(inode), name, NULL, &len,
+ ATTR_ROOT|ATTR_KERNOVAL) == 0);
+}
+
+int
+posix_acl_access_exists(struct inode *inode)
+{
+ return xfs_acl_exists(inode, SGI_ACL_FILE);
+}
+
+int
+posix_acl_default_exists(struct inode *inode)
+{
+ if (!S_ISDIR(inode->i_mode))
+ return 0;
+ return xfs_acl_exists(inode, SGI_ACL_DEFAULT);
+}
+
+int
+xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+{
+ int error = 0;
+
+ if (!acl)
+ goto set_acl;
+
+ error = -E2BIG;
+ if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
+ return error;
+
+ if (type == ACL_TYPE_ACCESS) {
+ umode_t mode = inode->i_mode;
+ error = posix_acl_equiv_mode(acl, &mode);
+
+ if (error <= 0) {
+ acl = NULL;
+
+ if (error < 0)
+ return error;
+ }
+
+ error = xfs_set_mode(inode, mode);
+ if (error)
+ return error;
+ }
+
+ set_acl:
+ return __xfs_set_acl(inode, type, acl);
+}