From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [PATCH v4 2/5] nfsd: introduce generalization of NFSv4 ACLs <-> POSIX ACLs mapping algorithms
This patch introduces generalization of mapping algorithms from NFSv4 ACLs to POSIX ACLs and vice versa. The essence of mapping algorithms (located in fs/nfsd/nfs4acl.c, previously) were generalized and moved in fs/nfs4acl.c with the purpose of sharing between file system drivers.
A concrete file system driver can use mapping code by means of map_posix_acl_to_nfsv4_one(), map_nfsv4_acl_to_posix(), nfs4_acl_posix_to_nfsv4(), nfs4_acl_nfsv4_to_posix() methods. Also, it is possible to specialize internal mapping operations in the case of very special way of operations under raw structures for concrete file system driver case.
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
CC: "J. Bruce Fields" <bfields@xxxxxxxxxx>
CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
CC: Christoph Hellwig <hch@xxxxxxxxxxxxx>
CC: Hin-Tak Leung <htl10@xxxxxxxxxxxxxxxxxxxxx>
---
fs/Makefile | 2 +-
fs/nfs4acl.c | 1261 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nfsd/acl.h | 11 +-
fs/nfsd/nfs4acl.c | 782 ++-------------------------------
4 files changed, 1303 insertions(+), 753 deletions(-)
create mode 100644 fs/nfs4acl.c
diff --git a/fs/Makefile b/fs/Makefile
index 4fe6df3..1aa279f 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -11,7 +11,7 @@ obj-y := open.o read_write.o file_table.o super.o \
attr.o bad_inode.o file.o filesystems.o namespace.o \
seq_file.o xattr.o libfs.o fs-writeback.o \
pnode.o splice.o sync.o utimes.o \
- stack.o fs_struct.o statfs.o
+ stack.o fs_struct.o statfs.o nfs4acl.o
ifeq ($(CONFIG_BLOCK),y)
obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
diff --git a/fs/nfs4acl.c b/fs/nfs4acl.c
new file mode 100644
index 0000000..df5a90d
--- /dev/null
+++ b/fs/nfs4acl.c
@@ -0,0 +1,1261 @@
+/*
+ * Common NFSv4 ACL handling code.
+ *
+ * Copyright (c) 2002, 2003 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Marius Aamodt Eriksen <marius@xxxxxxxxx>
+ * Jeff Sedlak <jsedlak@xxxxxxxxx>
+ * J. Bruce Fields <bfields@xxxxxxxxx>
+ * Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/fs.h>
+#include <linux/nfs4acl.h>
+#include <linux/export.h>
+
+static inline u32 nfsv4_mask_from_posix(unsigned short perm,
+ unsigned int flags);
+static inline u32 nfsv4_deny_mask_from_posix(unsigned short perm,
+ unsigned int flags);
+
+static inline unsigned int nfsv4_calculate_eflag(unsigned int flags)
+{
+ return (flags & NFS4_ACL_TYPE_DEFAULT) ?
+ NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0;
+}
+
+static inline unsigned int __calculate_eflag(
+ const struct nfsv4_acl_info *nfsv4_acl_info,
+ unsigned int flags)
+{
+ struct nfsv4_ace_flags_operations *flags_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ flags_ops = nfsv4_acl_info->flags_ops;
+
+ if (flags_ops && flags_ops->calculate_eflag)
+ return flags_ops->calculate_eflag(flags);
+
+ return nfsv4_calculate_eflag(flags);
+}
+
+static inline int nfsv4_prepare_nfsv4_acl_mapping(
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+
+ BUG_ON(*nfsv4_ace != NULL);
+ *nfsv4_ace = (void *)(acl->aces + acl->naces);
+
+ return 0;
+}
+
+static inline int __prepare_nfsv4_acl_mapping(
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfsv4_acl_mapping_operations *mapping_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ mapping_ops = nfsv4_acl_info->mapping_ops;
+
+ if (mapping_ops && mapping_ops->prepare_nfsv4_acl_mapping)
+ return mapping_ops->prepare_nfsv4_acl_mapping(nfsv4_acl_info,
+ nfsv4_ace);
+
+ return nfsv4_prepare_nfsv4_acl_mapping(nfsv4_acl_info, nfsv4_ace);
+}
+
+static int nfsv4_map_owner_ace(struct user_namespace *user_ns,
+ unsigned int eflag,
+ unsigned int flags,
+ unsigned short deny,
+ struct posix_acl_entry *pa,
+ struct posix_acl_summary *pas,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+ struct nfs4_ace *ace = *(struct nfs4_ace **)nfsv4_ace;
+
+ BUG_ON(ace == NULL || pa == NULL);
+
+ if (deny) {
+ ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
+ ace->flag = eflag;
+ ace->access_mask = nfsv4_deny_mask_from_posix(deny, flags);
+ ace->whotype = NFS4_ACL_WHO_OWNER;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+ }
+
+ ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->flag = eflag;
+ ace->access_mask = nfsv4_mask_from_posix(pa->e_perm,
+ flags | NFS4_ACL_OWNER);
+ ace->whotype = NFS4_ACL_WHO_OWNER;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+
+ return 0;
+}
+
+static int nfsv4_map_user_ace(struct user_namespace *user_ns,
+ unsigned int eflag,
+ unsigned int flags,
+ unsigned short deny,
+ struct posix_acl_entry *pa,
+ struct posix_acl_summary *pas,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+ struct nfs4_ace *ace = *(struct nfs4_ace **)nfsv4_ace;
+
+ BUG_ON(ace == NULL || pa == NULL || pas == NULL);
+
+ if (deny) {
+ ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
+ ace->flag = eflag;
+ ace->access_mask = nfsv4_deny_mask_from_posix(deny, flags);
+ ace->whotype = NFS4_ACL_WHO_NAMED;
+ ace->who_uid = pa->e_uid;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+ }
+
+ ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->flag = eflag;
+ ace->access_mask = nfsv4_mask_from_posix(pa->e_perm & pas->mask,
+ flags);
+ ace->whotype = NFS4_ACL_WHO_NAMED;
+ ace->who_uid = pa->e_uid;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+
+ return 0;
+}
+
+static int nfsv4_map_group_owner_deny_ace(struct user_namespace *user_ns,
+ unsigned int eflag,
+ unsigned int flags,
+ unsigned short deny,
+ struct posix_acl_entry *pa,
+ struct posix_acl_summary *pas,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+ struct nfs4_ace *ace = *(struct nfs4_ace **)nfsv4_ace;
+
+ BUG_ON(ace == NULL);
+
+ if (deny) {
+ ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
+ ace->flag = eflag;
+ ace->access_mask = nfsv4_deny_mask_from_posix(deny, flags);
+ ace->whotype = NFS4_ACL_WHO_GROUP;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+ }
+
+ return 0;
+}
+
+static int nfsv4_map_group_owner_permit_ace(struct user_namespace *user_ns,
+ unsigned int eflag,
+ unsigned int flags,
+ unsigned short deny,
+ struct posix_acl_entry *pa,
+ struct posix_acl_summary *pas,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+ struct nfs4_ace *ace = *(struct nfs4_ace **)nfsv4_ace;
+
+ BUG_ON(ace == NULL || pas == NULL);
+
+ ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->flag = eflag;
+ ace->access_mask = nfsv4_mask_from_posix(pas->group, flags);
+ ace->whotype = NFS4_ACL_WHO_GROUP;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+
+ return 0;
+}
+
+static int nfsv4_map_group_deny_ace(struct user_namespace *user_ns,
+ unsigned int eflag,
+ unsigned int flags,
+ unsigned short deny,
+ struct posix_acl_entry *pa,
+ struct posix_acl_summary *pas,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+ struct nfs4_ace *ace = *(struct nfs4_ace **)nfsv4_ace;
+
+ BUG_ON(ace == NULL || pa == NULL);
+
+ if (deny) {
+ ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
+ ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
+ ace->access_mask = nfsv4_deny_mask_from_posix(deny, flags);
+ ace->whotype = NFS4_ACL_WHO_NAMED;
+ ace->who_gid = pa->e_gid;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+ }
+
+ return 0;
+}
+
+static int nfsv4_map_group_permit_ace(struct user_namespace *user_ns,
+ unsigned int eflag,
+ unsigned int flags,
+ unsigned short deny,
+ struct posix_acl_entry *pa,
+ struct posix_acl_summary *pas,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+ struct nfs4_ace *ace = *(struct nfs4_ace **)nfsv4_ace;
+
+ BUG_ON(ace == NULL || pa == NULL || pas == NULL);
+
+ ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
+ ace->access_mask = nfsv4_mask_from_posix(pa->e_perm & pas->mask,
+ flags);
+ ace->whotype = NFS4_ACL_WHO_NAMED;
+ ace->who_gid = pa->e_gid;
+ *nfsv4_ace = (void *)(++ace);
+ acl->naces++;
+
+ return 0;
+}
+
+#define NFSV4_MAP_ACE_FNS(name) \
+static inline int __map_##name(struct user_namespace *user_ns, \
+ unsigned int eflag, \
+ unsigned int flags, \
+ unsigned short deny, \
+ struct posix_acl_entry *pa, \
+ struct posix_acl_summary *pas, \
+ struct nfsv4_acl_info *nfsv4_acl_info, \
+ void **nfsv4_ace) \
+{ \
+ struct nfsv4_acl_mapping_operations *mapping_ops = NULL; \
+ BUG_ON(!nfsv4_acl_info); \
+ mapping_ops = nfsv4_acl_info->mapping_ops; \
+ if (mapping_ops && mapping_ops->map_##name) \
+ return mapping_ops->map_##name(user_ns, eflag, \
+ flags, deny, pa, pas, \
+ nfsv4_acl_info, nfsv4_ace); \
+ return nfsv4_map_##name(user_ns, eflag, flags, deny, pa, pas, \
+ nfsv4_acl_info, nfsv4_ace); \
+}
+
+NFSV4_MAP_ACE_FNS(owner_ace)
+NFSV4_MAP_ACE_FNS(user_ace)
+NFSV4_MAP_ACE_FNS(group_owner_deny_ace)
+NFSV4_MAP_ACE_FNS(group_owner_permit_ace)
+NFSV4_MAP_ACE_FNS(group_deny_ace)
+NFSV4_MAP_ACE_FNS(group_permit_ace)
+
+static int nfsv4_map_everyone_permit_ace(unsigned int eflag,
+ unsigned int flags,
+ struct posix_acl_entry *pa,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfs4_acl *acl = (struct nfs4_acl *)nfsv4_acl_info->raw_acl;
+ struct nfs4_ace *ace = *(struct nfs4_ace **)nfsv4_ace;
+
+ BUG_ON(ace == NULL || pa == NULL);
+
+ ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->flag = eflag;
+ ace->access_mask = nfsv4_mask_from_posix(pa->e_perm, flags);
+ ace->whotype = NFS4_ACL_WHO_EVERYONE;
+ acl->naces++;
+
+ return 0;
+}
+
+static inline int __map_everyone_permit_ace(unsigned int eflag,
+ unsigned int flags,
+ struct posix_acl_entry *pa,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ void **nfsv4_ace)
+{
+ struct nfsv4_acl_mapping_operations *mapping_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ mapping_ops = nfsv4_acl_info->mapping_ops;
+
+ if (mapping_ops && mapping_ops->map_everyone_permit_ace)
+ return mapping_ops->map_everyone_permit_ace(eflag, flags, pa,
+ nfsv4_acl_info, nfsv4_ace);
+ return nfsv4_map_everyone_permit_ace(eflag, flags, pa,
+ nfsv4_acl_info, nfsv4_ace);
+}
+
+static inline int nfsv4_set_posix_ace_uid(struct user_namespace *user_ns,
+ struct posix_acl_entry *pace,
+ kuid_t uid)
+{
+ pace->e_uid = uid;
+ return 0;
+}
+
+static inline int nfsv4_set_posix_ace_gid(struct user_namespace *user_ns,
+ struct posix_acl_entry *pace,
+ kgid_t gid)
+{
+ pace->e_gid = gid;
+ return 0;
+}
+
+static inline int __set_posix_ace_uid(struct user_namespace *user_ns,
+ const struct nfsv4_acl_info *nfsv4_acl_info,
+ struct posix_acl_entry *pace,
+ kuid_t id)
+{
+ struct nfsv4_acl_id_operations *id_ops = NULL;
+ BUG_ON(!nfsv4_acl_info);
+ id_ops = nfsv4_acl_info->id_ops;
+ if (id_ops && id_ops->set_posix_ace_uid)
+ return id_ops->set_posix_ace_uid(user_ns, pace, id);
+ return nfsv4_set_posix_ace_uid(user_ns, pace, id);
+}
+
+static inline int __set_posix_ace_gid(struct user_namespace *user_ns,
+ const struct nfsv4_acl_info *nfsv4_acl_info,
+ struct posix_acl_entry *pace,
+ kgid_t id)
+{
+ const struct nfsv4_acl_id_operations *id_ops = NULL;
+ BUG_ON(!nfsv4_acl_info);
+ id_ops = nfsv4_acl_info->id_ops;
+ if (id_ops && id_ops->set_posix_ace_gid)
+ return id_ops->set_posix_ace_gid(user_ns, pace, id);
+ return nfsv4_set_posix_ace_gid(user_ns, pace, id);
+}
+
+static inline uint32_t nfsv4_get_access_mask(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace->access_mask;
+}
+
+static inline uint32_t __get_access_mask(
+ const struct nfsv4_acl_info *nfsv4_acl_info,
+ const void *nfsv4_ace)
+{
+ struct nfsv4_ace_operations *ace_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ ace_ops = nfsv4_acl_info->ace_ops;
+
+ if (ace_ops && ace_ops->get_access_mask)
+ return ace_ops->get_access_mask(nfsv4_ace);
+
+ return nfsv4_get_access_mask(nfsv4_ace);
+}
+
+static inline bool nfsv4_is_acl_user_obj(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace2type(ace) == ACL_USER_OBJ;
+}
+
+static inline bool nfsv4_is_acl_group_obj(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace2type(ace) == ACL_GROUP_OBJ;
+}
+
+static inline bool nfsv4_is_acl_other(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace2type(ace) == ACL_OTHER;
+}
+
+static inline bool nfsv4_is_acl_user(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace2type(ace) == ACL_USER;
+}
+
+static inline bool nfsv4_is_acl_group(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace2type(ace) == ACL_GROUP;
+}
+
+#define NFSV4_ACE_OPS_FNS(name) \
+static inline bool __is_##name(const struct nfsv4_acl_info *nfsv4_acl_info, \
+ const void *nfsv4_ace) \
+{ \
+ struct nfsv4_ace_operations *ace_ops = NULL; \
+ BUG_ON(!nfsv4_acl_info); \
+ ace_ops = nfsv4_acl_info->ace_ops; \
+ if (ace_ops && ace_ops->is_##name) \
+ return ace_ops->is_##name(nfsv4_acl_info, nfsv4_ace); \
+ return nfsv4_is_##name(nfsv4_ace); \
+}
+
+NFSV4_ACE_OPS_FNS(acl_user_obj)
+NFSV4_ACE_OPS_FNS(acl_group_obj)
+NFSV4_ACE_OPS_FNS(acl_other)
+NFSV4_ACE_OPS_FNS(acl_user)
+NFSV4_ACE_OPS_FNS(acl_group)
+
+static inline bool nfsv4_is_allowed_ace_type(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
+}
+
+static inline bool __is_allowed_ace_type(
+ const struct nfsv4_acl_info *nfsv4_acl_info,
+ const void *nfsv4_ace)
+{
+ struct nfsv4_ace_operations *ace_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ ace_ops = nfsv4_acl_info->ace_ops;
+
+ if (ace_ops && ace_ops->is_allowed_ace_type)
+ return ace_ops->is_allowed_ace_type(nfsv4_ace);
+
+ return nfsv4_is_allowed_ace_type(nfsv4_ace);
+}
+
+static inline uint32_t nfsv4_get_naces(const void *nfsv4_acl)
+{
+ const struct nfs4_acl *acl = (const struct nfs4_acl *)nfsv4_acl;
+ return acl->naces;
+}
+
+static inline uint32_t __get_naces(const struct nfsv4_acl_info *nfsv4_acl_info)
+{
+ struct nfsv4_ace_operations *ace_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ ace_ops = nfsv4_acl_info->ace_ops;
+
+ if (ace_ops && ace_ops->get_naces)
+ return ace_ops->get_naces(nfsv4_acl_info->raw_acl);
+
+ return nfsv4_get_naces(nfsv4_acl_info->raw_acl);
+}
+
+static inline void *nfsv4_get_ace(const void *nfsv4_acl, uint32_t index)
+{
+ const struct nfs4_acl *acl = (const struct nfs4_acl *)nfsv4_acl;
+ return (void *)(acl->aces + index);
+}
+
+static inline void *__get_ace(const struct nfsv4_acl_info *nfsv4_acl_info,
+ uint32_t index)
+{
+ struct nfsv4_ace_operations *ace_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ ace_ops = nfsv4_acl_info->ace_ops;
+
+ if (ace_ops && ace_ops->get_ace)
+ return ace_ops->get_ace(nfsv4_acl_info->raw_acl, index);
+
+ return nfsv4_get_ace(nfsv4_acl_info->raw_acl, index);
+}
+
+static inline bool nfsv4_ace_type_valid(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+
+ return ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE ||
+ ace->type == NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
+}
+
+static inline bool __ace_type_valid(
+ const struct nfsv4_acl_info *nfsv4_acl_info,
+ const void *nfsv4_ace)
+{
+ struct nfsv4_ace_operations *ace_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ ace_ops = nfsv4_acl_info->ace_ops;
+
+ if (ace_ops && ace_ops->ace_type_valid)
+ return ace_ops->ace_type_valid(nfsv4_ace);
+
+ return nfsv4_ace_type_valid(nfsv4_ace);
+}
+
+static inline bool nfsv4_ace_has_unknown_flags(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace->flag & ~NFS4_SUPPORTED_FLAGS;
+}
+
+static inline bool nfsv4_ace_has_inheritance_flags(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace->flag & NFS4_INHERITANCE_FLAGS;
+}
+
+static inline bool nfsv4_ace_inherit_only_flag(const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ return ace->flag & NFS4_ACE_INHERIT_ONLY_ACE;
+}
+
+#define NFSV4_ACE_FLAGS_OPS_FNS(name) \
+static inline bool __ace_##name(const struct nfsv4_acl_info *nfsv4_acl_info, \
+ const void *nfsv4_ace) \
+{ \
+ struct nfsv4_ace_flags_operations *flags_ops = NULL; \
+ BUG_ON(!nfsv4_acl_info); \
+ flags_ops = nfsv4_acl_info->flags_ops; \
+ if (flags_ops && flags_ops->ace_##name) \
+ return flags_ops->ace_##name(nfsv4_ace); \
+ return nfsv4_ace_##name(nfsv4_ace); \
+}
+
+NFSV4_ACE_FLAGS_OPS_FNS(has_unknown_flags)
+NFSV4_ACE_FLAGS_OPS_FNS(has_inheritance_flags)
+NFSV4_ACE_FLAGS_OPS_FNS(inherit_only_flag)
+
+static inline u32 nfsv4_mask_from_posix(unsigned short perm,
+ unsigned int flags)
+{
+ int mask = NFS4_ANYONE_MODE;
+
+ if (flags & NFS4_ACL_OWNER)
+ mask |= NFS4_OWNER_MODE;
+ if (perm & ACL_READ)
+ mask |= NFS4_READ_MODE;
+ if (perm & ACL_WRITE)
+ mask |= NFS4_WRITE_MODE;
+ if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
+ mask |= NFS4_ACE_DELETE_CHILD;
+ if (perm & ACL_EXECUTE)
+ mask |= NFS4_EXECUTE_MODE;
+ return mask;
+}
+
+static inline u32 nfsv4_deny_mask_from_posix(unsigned short perm,
+ unsigned int flags)
+{
+ u32 mask = 0;
+
+ if (perm & ACL_READ)
+ mask |= NFS4_READ_MODE;
+ if (perm & ACL_WRITE)
+ mask |= NFS4_WRITE_MODE;
+ if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
+ mask |= NFS4_ACE_DELETE_CHILD;
+ if (perm & ACL_EXECUTE)
+ mask |= NFS4_EXECUTE_MODE;
+ return mask;
+}
+
+/* XXX: modify functions to return NFS errors; they're only ever
+ * used by nfs code, after all.... */
+
+/* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
+ * side of being more restrictive, so the mode bit mapping below is
+ * pessimistic. An optimistic version would be needed to handle DENY's,
+ * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
+ * bits. */
+
+static void nfsv4_low_mode_from_nfs4(u32 perm, unsigned short *mode,
+ unsigned int flags)
+{
+ u32 write_mode = NFS4_WRITE_MODE;
+
+ if (flags & NFS4_ACL_DIR)
+ write_mode |= NFS4_ACE_DELETE_CHILD;
+ *mode = 0;
+ if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
+ *mode |= ACL_READ;
+ if ((perm & write_mode) == write_mode)
+ *mode |= ACL_WRITE;
+ if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
+ *mode |= ACL_EXECUTE;
+}
+
+static inline void __low_mode_from_nfs4(
+ const struct nfsv4_acl_info *nfsv4_acl_info,
+ u32 perm,
+ unsigned short *mode,
+ unsigned int flags)
+{
+ struct nfsv4_ace_flags_operations *flags_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ flags_ops = nfsv4_acl_info->flags_ops;
+
+ if (flags_ops && flags_ops->low_mode_from_nfs4)
+ return flags_ops->low_mode_from_nfs4(perm, mode, flags);
+
+ return nfsv4_low_mode_from_nfs4(perm, mode, flags);
+}
+
+static void summarize_posix_acl(struct posix_acl *acl,
+ struct posix_acl_summary *pas)
+{
+ struct posix_acl_entry *pa, *pe;
+
+ /*
+ * Only pas.users and pas.groups need initialization; previous
+ * posix_acl_valid() calls ensure that the other fields will be
+ * initialized in the following loop. But, just to placate gcc:
+ */
+ memset(pas, 0, sizeof(*pas));
+ pas->mask = 07;
+
+ pe = acl->a_entries + acl->a_count;
+
+ FOREACH_ACL_ENTRY(pa, acl, pe) {
+ switch (pa->e_tag) {
+ case ACL_USER_OBJ:
+ pas->owner = pa->e_perm;
+ break;
+ case ACL_GROUP_OBJ:
+ pas->group = pa->e_perm;
+ break;
+ case ACL_USER:
+ pas->users |= pa->e_perm;
+ break;
+ case ACL_GROUP:
+ pas->groups |= pa->e_perm;
+ break;
+ case ACL_OTHER:
+ pas->other = pa->e_perm;
+ break;
+ case ACL_MASK:
+ pas->mask = pa->e_perm;
+ break;
+ }
+ }
+ /* We'll only care about effective permissions: */
+ pas->users &= pas->mask;
+ pas->group &= pas->mask;
+ pas->groups &= pas->mask;
+}
+
+/* We assume the acl has been verified with posix_acl_valid. */
+int map_posix_acl_to_nfsv4_one(struct user_namespace *user_ns,
+ struct posix_acl *pacl,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ unsigned int flags)
+{
+ struct posix_acl_entry *pa, *group_owner_entry;
+ void *nfs4_ace = NULL;
+ struct posix_acl_summary pas;
+ unsigned short deny;
+ int eflag = __calculate_eflag(nfsv4_acl_info, flags);
+ int ret = 0;
+
+ BUG_ON(pacl->a_count < 3);
+ summarize_posix_acl(pacl, &pas);
+
+ pa = pacl->a_entries;
+ ret = __prepare_nfsv4_acl_mapping(nfsv4_acl_info, &nfs4_ace);
+ if (unlikely(ret))
+ return ret;
+
+ /* We could deny everything not granted by the owner: */
+ deny = ~pas.owner;
+ /*
+ * but it is equivalent (and simpler) to deny only what is not
+ * granted by later entries:
+ */
+ deny &= pas.users | pas.group | pas.groups | pas.other;
+
+ ret = __map_owner_ace(user_ns, eflag, flags, deny,
+ pa, &pas, nfsv4_acl_info, &nfs4_ace);
+ if (unlikely(ret))
+ return ret;
+ pa++;
+
+ while (pa->e_tag == ACL_USER) {
+ deny = ~(pa->e_perm & pas.mask);
+ deny &= pas.groups | pas.group | pas.other;
+ ret = __map_user_ace(user_ns, eflag, flags, deny,
+ pa, &pas, nfsv4_acl_info, &nfs4_ace);
+ if (unlikely(ret))
+ return ret;
+ pa++;
+ }
+
+ /* In the case of groups, we apply allow ACEs first, then deny ACEs,
+ * since a user can be in more than one group. */
+
+ /* allow ACEs */
+
+ group_owner_entry = pa;
+
+ ret = __map_group_owner_permit_ace(user_ns, eflag, flags, deny,
+ pa, &pas, nfsv4_acl_info, &nfs4_ace);
+ if (unlikely(ret))
+ return ret;
+ pa++;
+
+ while (pa->e_tag == ACL_GROUP) {
+ ret = __map_group_permit_ace(user_ns, eflag, flags, deny,
+ pa, &pas, nfsv4_acl_info, &nfs4_ace);
+ if (unlikely(ret))
+ return ret;
+ pa++;
+ }
+
+ /* deny ACEs */
+
+ pa = group_owner_entry;
+
+ deny = ~pas.group & pas.other;
+ ret = __map_group_owner_deny_ace(user_ns, eflag, flags, deny,
+ pa, &pas, nfsv4_acl_info, &nfs4_ace);
+ if (unlikely(ret))
+ return ret;
+ pa++;
+
+ while (pa->e_tag == ACL_GROUP) {
+ deny = ~(pa->e_perm & pas.mask);
+ deny &= pas.other;
+ ret = __map_group_deny_ace(user_ns, eflag, flags, deny,
+ pa, &pas, nfsv4_acl_info, &nfs4_ace);
+ if (unlikely(ret))
+ return ret;
+ pa++;
+ }
+
+ if (pa->e_tag == ACL_MASK)
+ pa++;
+ ret = __map_everyone_permit_ace(eflag, flags, pa,
+ nfsv4_acl_info, &nfs4_ace);
+
+ return ret;
+}
+EXPORT_SYMBOL(map_posix_acl_to_nfsv4_one);
+
+static bool pace_gt(struct posix_acl_entry *pace1,
+ struct posix_acl_entry *pace2)
+{
+ if (pace1->e_tag != pace2->e_tag)
+ return pace1->e_tag > pace2->e_tag;
+ if (pace1->e_tag == ACL_USER)
+ return uid_gt(pace1->e_uid, pace2->e_uid);
+ if (pace1->e_tag == ACL_GROUP)
+ return gid_gt(pace1->e_gid, pace2->e_gid);
+ return false;
+}
+
+static void sort_pacl_range(struct posix_acl *pacl, int start, int end)
+{
+ int sorted = 0, i;
+ struct posix_acl_entry tmp;
+
+ /* We just do a bubble sort; easy to do in place, and we're not
+ * expecting acl's to be long enough to justify anything more. */
+ while (!sorted) {
+ sorted = 1;
+ for (i = start; i < end; i++) {
+ if (pace_gt(&pacl->a_entries[i],
+ &pacl->a_entries[i+1])) {
+ sorted = 0;
+ tmp = pacl->a_entries[i];
+ pacl->a_entries[i] = pacl->a_entries[i+1];
+ pacl->a_entries[i+1] = tmp;
+ }
+ }
+ }
+}
+
+static void sort_pacl(struct posix_acl *pacl)
+{
+ /* posix_acl_valid requires that users and groups be in order
+ * by uid/gid. */
+ int i, j;
+
+ if (pacl->a_count <= 4)
+ return; /* no users or groups */
+ i = 1;
+ while (pacl->a_entries[i].e_tag == ACL_USER)
+ i++;
+ sort_pacl_range(pacl, 1, i-1);
+
+ BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
+ j = ++i;
+ while (pacl->a_entries[j].e_tag == ACL_GROUP)
+ j++;
+ sort_pacl_range(pacl, i, j-1);
+ return;
+}
+
+static int init_state(struct posix_acl_state *state, int cnt)
+{
+ int alloc;
+
+ memset(state, 0, sizeof(struct posix_acl_state));
+ state->empty = 1;
+ /*
+ * In the worst case, each individual acl could be for a distinct
+ * named user or group, but we don't no which, so we allocate
+ * enough space for either:
+ */
+ alloc = sizeof(struct posix_ace_state_array)
+ + cnt*sizeof(struct posix_user_ace_state);
+ state->users = kzalloc(alloc, GFP_KERNEL);
+ if (!state->users)
+ return -ENOMEM;
+ state->groups = kzalloc(alloc, GFP_KERNEL);
+ if (!state->groups) {
+ kfree(state->users);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void free_state(struct posix_acl_state *state)
+{
+ kfree(state->users);
+ kfree(state->groups);
+}
+
+static inline void add_to_mask(struct posix_acl_state *state,
+ struct posix_ace_state *astate)
+{
+ state->mask.allow |= astate->allow;
+}
+
+/*
+ * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
+ * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
+ * to traditional read/write/execute permissions.
+ *
+ * It's problematic to reject acls that use certain mode bits, because it
+ * places the burden on users to learn the rules about which bits one
+ * particular server sets, without giving the user a lot of help--we return an
+ * error that could mean any number of different things. To make matters
+ * worse, the problematic bits might be introduced by some application that's
+ * automatically mapping from some other acl model.
+ *
+ * So wherever possible we accept anything, possibly erring on the side of
+ * denying more permissions than necessary.
+ *
+ * However we do reject *explicit* DENY's of a few bits representing
+ * permissions we could never deny:
+ */
+
+static inline int nfsv4_check_deny(u32 mask, int isowner)
+{
+ if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
+ return -EINVAL;
+ if (!isowner)
+ return 0;
+ if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
+ return -EINVAL;
+ return 0;
+}
+
+static inline int __check_deny(const struct nfsv4_acl_info *nfsv4_acl_info,
+ u32 mask, int isowner)
+{
+ struct nfsv4_ace_flags_operations *flags_ops = NULL;
+
+ BUG_ON(!nfsv4_acl_info);
+ flags_ops = nfsv4_acl_info->flags_ops;
+
+ if (flags_ops && flags_ops->check_deny)
+ return flags_ops->check_deny(mask, isowner);
+
+ return nfsv4_check_deny(mask, isowner);
+}
+
+static struct posix_acl *posix_state_to_acl(struct user_namespace *user_ns,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ struct posix_acl_state *state,
+ unsigned int flags)
+{
+ struct posix_acl_entry *pace;
+ struct posix_acl *pacl;
+ int nace;
+ int i, error = 0;
+
+ /*
+ * ACLs with no ACEs are treated differently in the inheritable
+ * and effective cases: when there are no inheritable ACEs, we
+ * set a zero-length default posix acl:
+ */
+ if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) {
+ pacl = posix_acl_alloc(0, GFP_KERNEL);
+ return pacl ? pacl : ERR_PTR(-ENOMEM);
+ }
+ /*
+ * When there are no effective ACEs, the following will end
+ * up setting a 3-element effective posix ACL with all
+ * permissions zero.
+ */
+ nace = 4 + state->users->n + state->groups->n;
+ pacl = posix_acl_alloc(nace, GFP_KERNEL);
+ if (!pacl)
+ return ERR_PTR(-ENOMEM);
+
+ pace = pacl->a_entries;
+ pace->e_tag = ACL_USER_OBJ;
+ error = __check_deny(nfsv4_acl_info, state->owner.deny, 1);
+ if (error)
+ goto out_err;
+ __low_mode_from_nfs4(nfsv4_acl_info, state->owner.allow,
+ &pace->e_perm, flags);
+
+ for (i = 0; i < state->users->n; i++) {
+ pace++;
+ pace->e_tag = ACL_USER;
+ error = __check_deny(nfsv4_acl_info,
+ state->users->aces[i].perms.deny, 0);
+ if (error)
+ goto out_err;
+ __low_mode_from_nfs4(nfsv4_acl_info,
+ state->users->aces[i].perms.allow,
+ &pace->e_perm,
+ flags);
+ error = __set_posix_ace_uid(user_ns, nfsv4_acl_info, pace,
+ state->users->aces[i].uid);
+ if (error)
+ goto out_err;
+ add_to_mask(state, &state->users->aces[i].perms);
+ }
+
+ pace++;
+ pace->e_tag = ACL_GROUP_OBJ;
+ error = __check_deny(nfsv4_acl_info, state->group.deny, 0);
+ if (error)
+ goto out_err;
+ __low_mode_from_nfs4(nfsv4_acl_info, state->group.allow,
+ &pace->e_perm, flags);
+ add_to_mask(state, &state->group);
+
+ for (i = 0; i < state->groups->n; i++) {
+ pace++;
+ pace->e_tag = ACL_GROUP;
+ error = __check_deny(nfsv4_acl_info,
+ state->groups->aces[i].perms.deny, 0);
+ if (error)
+ goto out_err;
+ __low_mode_from_nfs4(nfsv4_acl_info,
+ state->groups->aces[i].perms.allow,
+ &pace->e_perm,
+ flags);
+ error = __set_posix_ace_gid(user_ns, nfsv4_acl_info, pace,
+ state->groups->aces[i].gid);
+ if (error)
+ goto out_err;
+ add_to_mask(state, &state->groups->aces[i].perms);
+ }
+
+ pace++;
+ pace->e_tag = ACL_MASK;
+ __low_mode_from_nfs4(nfsv4_acl_info, state->mask.allow,
+ &pace->e_perm, flags);
+
+ pace++;
+ pace->e_tag = ACL_OTHER;
+ error = __check_deny(nfsv4_acl_info, state->other.deny, 0);
+ if (error)
+ goto out_err;
+ __low_mode_from_nfs4(nfsv4_acl_info, state->other.allow,
+ &pace->e_perm, flags);
+
+ return pacl;
+out_err:
+ posix_acl_release(pacl);
+ return ERR_PTR(error);
+}
+
+static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
+{
+ /* Allow all bits in the mask not already denied: */
+ astate->allow |= mask & ~astate->deny;
+}
+
+static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
+{
+ int i;
+
+ for (i = 0; i < a->n; i++)
+ allow_bits(&a->aces[i].perms, mask);
+}
+
+static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
+{
+ /* Deny all bits in the mask not already allowed: */
+ astate->deny |= mask & ~astate->allow;
+}
+
+static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
+{
+ int i;
+
+ for (i = 0; i < a->n; i++)
+ deny_bits(&a->aces[i].perms, mask);
+}
+
+static int nfsv4_find_uid(struct posix_acl_state *state,
+ const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ struct posix_ace_state_array *a = state->users;
+ kuid_t uid = ace->who_uid;
+ int i;
+
+ for (i = 0; i < a->n; i++)
+ if (uid_eq(a->aces[i].uid, uid))
+ return i;
+ /* Not found: */
+ a->n++;
+ a->aces[i].uid = uid;
+ a->aces[i].perms.allow = state->everyone.allow;
+ a->aces[i].perms.deny = state->everyone.deny;
+
+ return i;
+}
+
+static int nfsv4_find_gid(struct posix_acl_state *state,
+ const void *nfsv4_ace)
+{
+ const struct nfs4_ace *ace = (const struct nfs4_ace *)nfsv4_ace;
+ struct posix_ace_state_array *a = state->users;
+ kgid_t gid = ace->who_gid;
+ int i;
+
+ for (i = 0; i < a->n; i++)
+ if (gid_eq(a->aces[i].gid, gid))
+ return i;
+ /* Not found: */
+ a->n++;
+ a->aces[i].gid = gid;
+ a->aces[i].perms.allow = state->everyone.allow;
+ a->aces[i].perms.deny = state->everyone.deny;
+
+ return i;
+}
+
+#define NFSV4_ACL_FIND_ID_FNS(name) \
+static inline int __find_##name(const struct nfsv4_acl_info *nfsv4_acl_info, \
+ struct posix_acl_state *state, \
+ const void *nfsv4_ace) \
+{ \
+ struct nfsv4_acl_id_operations *id_ops = NULL; \
+ BUG_ON(!nfsv4_acl_info); \
+ id_ops = nfsv4_acl_info->id_ops; \
+ if (id_ops && id_ops->find_##name) \
+ return id_ops->find_##name(state, nfsv4_ace); \
+ return nfsv4_find_##name(state, nfsv4_ace); \
+}
+
+NFSV4_ACL_FIND_ID_FNS(uid)
+NFSV4_ACL_FIND_ID_FNS(gid)
+
+static void process_one_v4_ace(struct nfsv4_acl_info *nfsv4_acl_info,
+ struct posix_acl_state *state,
+ const void *nfsv4_ace)
+{
+ u32 mask = __get_access_mask(nfsv4_acl_info, nfsv4_ace);
+ int i;
+
+ state->empty = 0;
+
+ if (__is_acl_user_obj(nfsv4_acl_info, nfsv4_ace)) {
+ if (__is_allowed_ace_type(nfsv4_acl_info, nfsv4_ace))
+ allow_bits(&state->owner, mask);
+ else
+ deny_bits(&state->owner, mask);
+ } else if (__is_acl_user(nfsv4_acl_info, nfsv4_ace)) {
+ i = __find_uid(nfsv4_acl_info, state, nfsv4_ace);
+ if (__is_allowed_ace_type(nfsv4_acl_info, nfsv4_ace))
+ allow_bits(&state->users->aces[i].perms, mask);
+ else {
+ deny_bits(&state->users->aces[i].perms, mask);
+ mask = state->users->aces[i].perms.deny;
+ deny_bits(&state->owner, mask);
+ }
+ } else if (__is_acl_group_obj(nfsv4_acl_info, nfsv4_ace)) {
+ if (__is_allowed_ace_type(nfsv4_acl_info, nfsv4_ace))
+ allow_bits(&state->group, mask);
+ else {
+ deny_bits(&state->group, mask);
+ mask = state->group.deny;
+ deny_bits(&state->owner, mask);
+ deny_bits(&state->everyone, mask);
+ deny_bits_array(state->users, mask);
+ deny_bits_array(state->groups, mask);
+ }
+ } else if (__is_acl_group(nfsv4_acl_info, nfsv4_ace)) {
+ i = __find_gid(nfsv4_acl_info, state, nfsv4_ace);
+ if (__is_allowed_ace_type(nfsv4_acl_info, nfsv4_ace)) {
+ allow_bits(&state->groups->aces[i].perms, mask);
+ } else {
+ deny_bits(&state->groups->aces[i].perms, mask);
+ mask = state->groups->aces[i].perms.deny;
+ deny_bits(&state->owner, mask);
+ deny_bits(&state->group, mask);
+ deny_bits(&state->everyone, mask);
+ deny_bits_array(state->users, mask);
+ deny_bits_array(state->groups, mask);
+ }
+ } else if (__is_acl_other(nfsv4_acl_info, nfsv4_ace)) {
+ if (__is_allowed_ace_type(nfsv4_acl_info, nfsv4_ace)) {
+ allow_bits(&state->owner, mask);
+ allow_bits(&state->group, mask);
+ allow_bits(&state->other, mask);
+ allow_bits(&state->everyone, mask);
+ allow_bits_array(state->users, mask);
+ allow_bits_array(state->groups, mask);
+ } else {
+ deny_bits(&state->owner, mask);
+ deny_bits(&state->group, mask);
+ deny_bits(&state->other, mask);
+ deny_bits(&state->everyone, mask);
+ deny_bits_array(state->users, mask);
+ deny_bits_array(state->groups, mask);
+ }
+ }
+}
+
+int map_nfsv4_acl_to_posix(struct user_namespace *user_ns,
+ struct nfsv4_acl_info *nfsv4_acl_info,
+ struct posix_acl **pacl,
+ struct posix_acl **dpacl,
+ unsigned int flags)
+{
+ struct posix_acl_state effective_acl_state, default_acl_state;
+ void *nfsv4_ace;
+ uint32_t index;
+ int ret;
+
+ ret = init_state(&effective_acl_state, __get_naces(nfsv4_acl_info));
+ if (ret)
+ return ret;
+ ret = init_state(&default_acl_state, __get_naces(nfsv4_acl_info));
+ if (ret)
+ goto out_estate;
+
+ ret = -EINVAL;
+ for (index = 0; index < __get_naces(nfsv4_acl_info); ++index) {
+
+ nfsv4_ace = __get_ace(nfsv4_acl_info, index);
+
+ if (unlikely(IS_ERR(nfsv4_ace)))
+ goto out_dstate;
+ if (!__ace_type_valid(nfsv4_acl_info, nfsv4_ace))
+ goto out_dstate;
+ if (__ace_has_unknown_flags(nfsv4_acl_info, nfsv4_ace))
+ goto out_dstate;
+ if (!__ace_has_inheritance_flags(nfsv4_acl_info, nfsv4_ace)) {
+ process_one_v4_ace(nfsv4_acl_info,
+ &effective_acl_state,
+ nfsv4_ace);
+ continue;
+ }
+ if (!(flags & NFS4_ACL_DIR))
+ goto out_dstate;
+ /*
+ * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
+ * is set, we're effectively turning on the other. That's OK,
+ * according to rfc 3530.
+ */
+ process_one_v4_ace(nfsv4_acl_info,
+ &default_acl_state, nfsv4_ace);
+
+ if (!__ace_inherit_only_flag(nfsv4_acl_info, nfsv4_ace))
+ process_one_v4_ace(nfsv4_acl_info,
+ &effective_acl_state,
+ nfsv4_ace);
+ }
+
+ *pacl = posix_state_to_acl(user_ns,
+ nfsv4_acl_info,
+ &effective_acl_state,
+ flags);
+ if (IS_ERR(*pacl)) {
+ ret = PTR_ERR(*pacl);
+ *pacl = NULL;
+ goto out_dstate;
+ }
+ *dpacl = posix_state_to_acl(user_ns,
+ nfsv4_acl_info,
+ &default_acl_state,
+ flags | NFS4_ACL_TYPE_DEFAULT);
+ if (IS_ERR(*dpacl)) {
+ ret = PTR_ERR(*dpacl);
+ *dpacl = NULL;
+ posix_acl_release(*pacl);
+ *pacl = NULL;
+ goto out_dstate;
+ }
+ sort_pacl(*pacl);
+ sort_pacl(*dpacl);
+ ret = 0;
+out_dstate:
+ free_state(&default_acl_state);
+out_estate:
+ free_state(&effective_acl_state);
+ return ret;
+}
+EXPORT_SYMBOL(map_nfsv4_acl_to_posix);
+
+short ace2type(const struct nfs4_ace *ace)
+{
+ switch (ace->whotype) {
+ case NFS4_ACL_WHO_NAMED:
+ return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) ?
+ ACL_GROUP : ACL_USER;
+ case NFS4_ACL_WHO_OWNER:
+ return ACL_USER_OBJ;
+ case NFS4_ACL_WHO_GROUP:
+ return ACL_GROUP_OBJ;
+ case NFS4_ACL_WHO_EVERYONE:
+ return ACL_OTHER;
+ }
+ BUG();
+ return -1;
+}
+EXPORT_SYMBOL(ace2type);
diff --git a/fs/nfsd/acl.h b/fs/nfsd/acl.h
index 8b186a4..dce725f 100644
--- a/fs/nfsd/acl.h
+++ b/fs/nfsd/acl.h
@@ -35,7 +35,7 @@
#ifndef LINUX_NFS4_ACL_H
#define LINUX_NFS4_ACL_H
-#include <linux/posix_acl.h>
+#include <linux/nfs4acl.h>
/* Maximum ACL we'll accept from client; chosen (somewhat arbitrarily) to
* fit in a page: */
@@ -45,13 +45,4 @@ struct nfs4_acl *nfs4_acl_new(int);
int nfs4_acl_get_whotype(char *, u32);
int nfs4_acl_write_who(int who, char *p);
-#define NFS4_ACL_TYPE_DEFAULT 0x01
-#define NFS4_ACL_DIR 0x02
-#define NFS4_ACL_OWNER 0x04
-
-struct nfs4_acl *nfs4_acl_posix_to_nfsv4(struct posix_acl *,
- struct posix_acl *, unsigned int flags);
-int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *, struct posix_acl **,
- struct posix_acl **, unsigned int flags);
-
#endif /* LINUX_NFS4_ACL_H */
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index 8a50b3c..c5e58e5 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -39,102 +39,29 @@
#include <linux/export.h>
#include "acl.h"
-
-/* mode bit translations: */
-#define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
-#define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
-#define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
-#define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
-#define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
-
-/* We don't support these bits; insist they be neither allowed nor denied */
-#define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \
- | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS)
-
-/* flags used to simulate posix default ACLs */
-#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
- | NFS4_ACE_DIRECTORY_INHERIT_ACE)
-
-#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
- | NFS4_ACE_INHERIT_ONLY_ACE \
- | NFS4_ACE_IDENTIFIER_GROUP)
-
-#define MASK_EQUAL(mask1, mask2) \
- ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
-
-static u32
-mask_from_posix(unsigned short perm, unsigned int flags)
+struct nfs4_acl *nfs4_acl_new(int n)
{
- int mask = NFS4_ANYONE_MODE;
-
- if (flags & NFS4_ACL_OWNER)
- mask |= NFS4_OWNER_MODE;
- if (perm & ACL_READ)
- mask |= NFS4_READ_MODE;
- if (perm & ACL_WRITE)
- mask |= NFS4_WRITE_MODE;
- if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
- mask |= NFS4_ACE_DELETE_CHILD;
- if (perm & ACL_EXECUTE)
- mask |= NFS4_EXECUTE_MODE;
- return mask;
-}
-
-static u32
-deny_mask_from_posix(unsigned short perm, u32 flags)
-{
- u32 mask = 0;
+ struct nfs4_acl *acl;
- if (perm & ACL_READ)
- mask |= NFS4_READ_MODE;
- if (perm & ACL_WRITE)
- mask |= NFS4_WRITE_MODE;
- if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
- mask |= NFS4_ACE_DELETE_CHILD;
- if (perm & ACL_EXECUTE)
- mask |= NFS4_EXECUTE_MODE;
- return mask;
+ acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL);
+ if (acl == NULL)
+ return NULL;
+ acl->naces = 0;
+ return acl;
}
-/* XXX: modify functions to return NFS errors; they're only ever
- * used by nfs code, after all.... */
-
-/* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
- * side of being more restrictive, so the mode bit mapping below is
- * pessimistic. An optimistic version would be needed to handle DENY's,
- * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
- * bits. */
-
-static void
-low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
+struct nfs4_acl *nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl,
+ struct posix_acl *dpacl,
+ unsigned int flags)
{
- u32 write_mode = NFS4_WRITE_MODE;
-
- if (flags & NFS4_ACL_DIR)
- write_mode |= NFS4_ACE_DELETE_CHILD;
- *mode = 0;
- if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
- *mode |= ACL_READ;
- if ((perm & write_mode) == write_mode)
- *mode |= ACL_WRITE;
- if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
- *mode |= ACL_EXECUTE;
-}
-
-struct ace_container {
- struct nfs4_ace *ace;
- struct list_head ace_l;
-};
-
-static short ace2type(struct nfs4_ace *);
-static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
- unsigned int);
-
-struct nfs4_acl *
-nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
- unsigned int flags)
-{
- struct nfs4_acl *acl;
+ struct nfsv4_acl_info acl_info = {
+ .ace_ops = NULL,
+ .flags_ops = NULL,
+ .id_ops = NULL,
+ .mapping_ops = NULL,
+ .raw_acl = NULL,
+ .private = NULL
+ };
int size = 0;
if (pacl) {
@@ -149,670 +76,43 @@ nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
}
/* Allocate for worst case: one (deny, allow) pair each: */
- acl = nfs4_acl_new(size);
- if (acl == NULL)
+ acl_info.raw_acl = nfs4_acl_new(size);
+ if (acl_info.raw_acl == NULL)
return ERR_PTR(-ENOMEM);
- if (pacl)
- _posix_to_nfsv4_one(pacl, acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
-
- if (dpacl)
- _posix_to_nfsv4_one(dpacl, acl, flags | NFS4_ACL_TYPE_DEFAULT);
-
- return acl;
-}
-
-struct posix_acl_summary {
- unsigned short owner;
- unsigned short users;
- unsigned short group;
- unsigned short groups;
- unsigned short other;
- unsigned short mask;
-};
-
-static void
-summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas)
-{
- struct posix_acl_entry *pa, *pe;
-
- /*
- * Only pas.users and pas.groups need initialization; previous
- * posix_acl_valid() calls ensure that the other fields will be
- * initialized in the following loop. But, just to placate gcc:
- */
- memset(pas, 0, sizeof(*pas));
- pas->mask = 07;
-
- pe = acl->a_entries + acl->a_count;
-
- FOREACH_ACL_ENTRY(pa, acl, pe) {
- switch (pa->e_tag) {
- case ACL_USER_OBJ:
- pas->owner = pa->e_perm;
- break;
- case ACL_GROUP_OBJ:
- pas->group = pa->e_perm;
- break;
- case ACL_USER:
- pas->users |= pa->e_perm;
- break;
- case ACL_GROUP:
- pas->groups |= pa->e_perm;
- break;
- case ACL_OTHER:
- pas->other = pa->e_perm;
- break;
- case ACL_MASK:
- pas->mask = pa->e_perm;
- break;
- }
- }
- /* We'll only care about effective permissions: */
- pas->users &= pas->mask;
- pas->group &= pas->mask;
- pas->groups &= pas->mask;
-}
-
-/* We assume the acl has been verified with posix_acl_valid. */
-static void
-_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
- unsigned int flags)
-{
- struct posix_acl_entry *pa, *group_owner_entry;
- struct nfs4_ace *ace;
- struct posix_acl_summary pas;
- unsigned short deny;
- int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
- NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0);
-
- BUG_ON(pacl->a_count < 3);
- summarize_posix_acl(pacl, &pas);
-
- pa = pacl->a_entries;
- ace = acl->aces + acl->naces;
-
- /* We could deny everything not granted by the owner: */
- deny = ~pas.owner;
- /*
- * but it is equivalent (and simpler) to deny only what is not
- * granted by later entries:
- */
- deny &= pas.users | pas.group | pas.groups | pas.other;
- if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_OWNER;
- ace++;
- acl->naces++;
- }
-
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
- ace->whotype = NFS4_ACL_WHO_OWNER;
- ace++;
- acl->naces++;
- pa++;
-
- while (pa->e_tag == ACL_USER) {
- deny = ~(pa->e_perm & pas.mask);
- deny &= pas.groups | pas.group | pas.other;
- if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_uid = pa->e_uid;
- ace++;
- acl->naces++;
- }
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
- flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_uid = pa->e_uid;
- ace++;
- acl->naces++;
- pa++;
- }
-
- /* In the case of groups, we apply allow ACEs first, then deny ACEs,
- * since a user can be in more than one group. */
-
- /* allow ACEs */
-
- group_owner_entry = pa;
-
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pas.group, flags);
- ace->whotype = NFS4_ACL_WHO_GROUP;
- ace++;
- acl->naces++;
- pa++;
-
- while (pa->e_tag == ACL_GROUP) {
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
- ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
- flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_gid = pa->e_gid;
- ace++;
- acl->naces++;
- pa++;
- }
-
- /* deny ACEs */
-
- pa = group_owner_entry;
-
- deny = ~pas.group & pas.other;
- if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_GROUP;
- ace++;
- acl->naces++;
- }
- pa++;
-
- while (pa->e_tag == ACL_GROUP) {
- deny = ~(pa->e_perm & pas.mask);
- deny &= pas.other;
- if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_gid = pa->e_gid;
- ace++;
- acl->naces++;
- }
- pa++;
- }
-
- if (pa->e_tag == ACL_MASK)
- pa++;
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm, flags);
- ace->whotype = NFS4_ACL_WHO_EVERYONE;
- acl->naces++;
-}
-
-static bool
-pace_gt(struct posix_acl_entry *pace1, struct posix_acl_entry *pace2)
-{
- if (pace1->e_tag != pace2->e_tag)
- return pace1->e_tag > pace2->e_tag;
- if (pace1->e_tag == ACL_USER)
- return uid_gt(pace1->e_uid, pace2->e_uid);
- if (pace1->e_tag == ACL_GROUP)
- return gid_gt(pace1->e_gid, pace2->e_gid);
- return false;
-}
-
-static void
-sort_pacl_range(struct posix_acl *pacl, int start, int end) {
- int sorted = 0, i;
- struct posix_acl_entry tmp;
-
- /* We just do a bubble sort; easy to do in place, and we're not
- * expecting acl's to be long enough to justify anything more. */
- while (!sorted) {
- sorted = 1;
- for (i = start; i < end; i++) {
- if (pace_gt(&pacl->a_entries[i],
- &pacl->a_entries[i+1])) {
- sorted = 0;
- tmp = pacl->a_entries[i];
- pacl->a_entries[i] = pacl->a_entries[i+1];
- pacl->a_entries[i+1] = tmp;
- }
- }
- }
-}
-
-static void
-sort_pacl(struct posix_acl *pacl)
-{
- /* posix_acl_valid requires that users and groups be in order
- * by uid/gid. */
- int i, j;
-
- if (pacl->a_count <= 4)
- return; /* no users or groups */
- i = 1;
- while (pacl->a_entries[i].e_tag == ACL_USER)
- i++;
- sort_pacl_range(pacl, 1, i-1);
-
- BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
- j = ++i;
- while (pacl->a_entries[j].e_tag == ACL_GROUP)
- j++;
- sort_pacl_range(pacl, i, j-1);
- return;
-}
-
-/*
- * While processing the NFSv4 ACE, this maintains bitmasks representing
- * which permission bits have been allowed and which denied to a given
- * entity: */
-struct posix_ace_state {
- u32 allow;
- u32 deny;
-};
-
-struct posix_user_ace_state {
- union {
- kuid_t uid;
- kgid_t gid;
- };
- struct posix_ace_state perms;
-};
-
-struct posix_ace_state_array {
- int n;
- struct posix_user_ace_state aces[];
-};
-
-/*
- * While processing the NFSv4 ACE, this maintains the partial permissions
- * calculated so far: */
-
-struct posix_acl_state {
- int empty;
- struct posix_ace_state owner;
- struct posix_ace_state group;
- struct posix_ace_state other;
- struct posix_ace_state everyone;
- struct posix_ace_state mask; /* Deny unused in this case */
- struct posix_ace_state_array *users;
- struct posix_ace_state_array *groups;
-};
-
-static int
-init_state(struct posix_acl_state *state, int cnt)
-{
- int alloc;
-
- memset(state, 0, sizeof(struct posix_acl_state));
- state->empty = 1;
- /*
- * In the worst case, each individual acl could be for a distinct
- * named user or group, but we don't no which, so we allocate
- * enough space for either:
- */
- alloc = sizeof(struct posix_ace_state_array)
- + cnt*sizeof(struct posix_user_ace_state);
- state->users = kzalloc(alloc, GFP_KERNEL);
- if (!state->users)
- return -ENOMEM;
- state->groups = kzalloc(alloc, GFP_KERNEL);
- if (!state->groups) {
- kfree(state->users);
- return -ENOMEM;
- }
- return 0;
-}
-
-static void
-free_state(struct posix_acl_state *state) {
- kfree(state->users);
- kfree(state->groups);
-}
-
-static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
-{
- state->mask.allow |= astate->allow;
-}
-
-/*
- * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
- * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
- * to traditional read/write/execute permissions.
- *
- * It's problematic to reject acls that use certain mode bits, because it
- * places the burden on users to learn the rules about which bits one
- * particular server sets, without giving the user a lot of help--we return an
- * error that could mean any number of different things. To make matters
- * worse, the problematic bits might be introduced by some application that's
- * automatically mapping from some other acl model.
- *
- * So wherever possible we accept anything, possibly erring on the side of
- * denying more permissions than necessary.
- *
- * However we do reject *explicit* DENY's of a few bits representing
- * permissions we could never deny:
- */
-
-static inline int check_deny(u32 mask, int isowner)
-{
- if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
- return -EINVAL;
- if (!isowner)
- return 0;
- if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
- return -EINVAL;
- return 0;
-}
-
-static struct posix_acl *
-posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
-{
- struct posix_acl_entry *pace;
- struct posix_acl *pacl;
- int nace;
- int i, error = 0;
-
- /*
- * ACLs with no ACEs are treated differently in the inheritable
- * and effective cases: when there are no inheritable ACEs, we
- * set a zero-length default posix acl:
- */
- if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) {
- pacl = posix_acl_alloc(0, GFP_KERNEL);
- return pacl ? pacl : ERR_PTR(-ENOMEM);
- }
- /*
- * When there are no effective ACEs, the following will end
- * up setting a 3-element effective posix ACL with all
- * permissions zero.
- */
- nace = 4 + state->users->n + state->groups->n;
- pacl = posix_acl_alloc(nace, GFP_KERNEL);
- if (!pacl)
- return ERR_PTR(-ENOMEM);
-
- pace = pacl->a_entries;
- pace->e_tag = ACL_USER_OBJ;
- error = check_deny(state->owner.deny, 1);
- if (error)
- goto out_err;
- low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags);
-
- for (i=0; i < state->users->n; i++) {
- pace++;
- pace->e_tag = ACL_USER;
- error = check_deny(state->users->aces[i].perms.deny, 0);
- if (error)
- goto out_err;
- low_mode_from_nfs4(state->users->aces[i].perms.allow,
- &pace->e_perm, flags);
- pace->e_uid = state->users->aces[i].uid;
- add_to_mask(state, &state->users->aces[i].perms);
+ if (pacl) {
+ map_posix_acl_to_nfsv4_one(&init_user_ns, pacl, &acl_info,
+ flags & ~NFS4_ACL_TYPE_DEFAULT);
}
- pace++;
- pace->e_tag = ACL_GROUP_OBJ;
- error = check_deny(state->group.deny, 0);
- if (error)
- goto out_err;
- low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags);
- add_to_mask(state, &state->group);
-
- for (i=0; i < state->groups->n; i++) {
- pace++;
- pace->e_tag = ACL_GROUP;
- error = check_deny(state->groups->aces[i].perms.deny, 0);
- if (error)
- goto out_err;
- low_mode_from_nfs4(state->groups->aces[i].perms.allow,
- &pace->e_perm, flags);
- pace->e_gid = state->groups->aces[i].gid;
- add_to_mask(state, &state->groups->aces[i].perms);
+ if (dpacl) {
+ map_posix_acl_to_nfsv4_one(&init_user_ns, dpacl, &acl_info,
+ flags | NFS4_ACL_TYPE_DEFAULT);
}
- pace++;
- pace->e_tag = ACL_MASK;
- low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
-
- pace++;
- pace->e_tag = ACL_OTHER;
- error = check_deny(state->other.deny, 0);
- if (error)
- goto out_err;
- low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
-
- return pacl;
-out_err:
- posix_acl_release(pacl);
- return ERR_PTR(error);
-}
-
-static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
-{
- /* Allow all bits in the mask not already denied: */
- astate->allow |= mask & ~astate->deny;
-}
-
-static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
-{
- /* Deny all bits in the mask not already allowed: */
- astate->deny |= mask & ~astate->allow;
-}
-
-static int find_uid(struct posix_acl_state *state, kuid_t uid)
-{
- struct posix_ace_state_array *a = state->users;
- int i;
-
- for (i = 0; i < a->n; i++)
- if (uid_eq(a->aces[i].uid, uid))
- return i;
- /* Not found: */
- a->n++;
- a->aces[i].uid = uid;
- a->aces[i].perms.allow = state->everyone.allow;
- a->aces[i].perms.deny = state->everyone.deny;
-
- return i;
-}
-
-static int find_gid(struct posix_acl_state *state, kgid_t gid)
-{
- struct posix_ace_state_array *a = state->groups;
- int i;
-
- for (i = 0; i < a->n; i++)
- if (gid_eq(a->aces[i].gid, gid))
- return i;
- /* Not found: */
- a->n++;
- a->aces[i].gid = gid;
- a->aces[i].perms.allow = state->everyone.allow;
- a->aces[i].perms.deny = state->everyone.deny;
-
- return i;
-}
-
-static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
-{
- int i;
-
- for (i=0; i < a->n; i++)
- deny_bits(&a->aces[i].perms, mask);
-}
-
-static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
-{
- int i;
-
- for (i=0; i < a->n; i++)
- allow_bits(&a->aces[i].perms, mask);
-}
-
-static void process_one_v4_ace(struct posix_acl_state *state,
- struct nfs4_ace *ace)
-{
- u32 mask = ace->access_mask;
- int i;
-
- state->empty = 0;
-
- switch (ace2type(ace)) {
- case ACL_USER_OBJ:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
- allow_bits(&state->owner, mask);
- } else {
- deny_bits(&state->owner, mask);
- }
- break;
- case ACL_USER:
- i = find_uid(state, ace->who_uid);
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
- allow_bits(&state->users->aces[i].perms, mask);
- } else {
- deny_bits(&state->users->aces[i].perms, mask);
- mask = state->users->aces[i].perms.deny;
- deny_bits(&state->owner, mask);
- }
- break;
- case ACL_GROUP_OBJ:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
- allow_bits(&state->group, mask);
- } else {
- deny_bits(&state->group, mask);
- mask = state->group.deny;
- deny_bits(&state->owner, mask);
- deny_bits(&state->everyone, mask);
- deny_bits_array(state->users, mask);
- deny_bits_array(state->groups, mask);
- }
- break;
- case ACL_GROUP:
- i = find_gid(state, ace->who_gid);
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
- allow_bits(&state->groups->aces[i].perms, mask);
- } else {
- deny_bits(&state->groups->aces[i].perms, mask);
- mask = state->groups->aces[i].perms.deny;
- deny_bits(&state->owner, mask);
- deny_bits(&state->group, mask);
- deny_bits(&state->everyone, mask);
- deny_bits_array(state->users, mask);
- deny_bits_array(state->groups, mask);
- }
- break;
- case ACL_OTHER:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
- allow_bits(&state->owner, mask);
- allow_bits(&state->group, mask);
- allow_bits(&state->other, mask);
- allow_bits(&state->everyone, mask);
- allow_bits_array(state->users, mask);
- allow_bits_array(state->groups, mask);
- } else {
- deny_bits(&state->owner, mask);
- deny_bits(&state->group, mask);
- deny_bits(&state->other, mask);
- deny_bits(&state->everyone, mask);
- deny_bits_array(state->users, mask);
- deny_bits_array(state->groups, mask);
- }
- }
+ return (struct nfs4_acl *)acl_info.raw_acl;
}
int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
struct posix_acl **dpacl, unsigned int flags)
{
- struct posix_acl_state effective_acl_state, default_acl_state;
- struct nfs4_ace *ace;
- int ret;
-
- ret = init_state(&effective_acl_state, acl->naces);
- if (ret)
- return ret;
- ret = init_state(&default_acl_state, acl->naces);
- if (ret)
- goto out_estate;
- ret = -EINVAL;
- for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
- if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
- ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
- goto out_dstate;
- if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
- goto out_dstate;
- if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
- process_one_v4_ace(&effective_acl_state, ace);
- continue;
- }
- if (!(flags & NFS4_ACL_DIR))
- goto out_dstate;
- /*
- * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
- * is set, we're effectively turning on the other. That's OK,
- * according to rfc 3530.
- */
- process_one_v4_ace(&default_acl_state, ace);
+ struct nfsv4_acl_info acl_info = {
+ .ace_ops = NULL,
+ .flags_ops = NULL,
+ .id_ops = NULL,
+ .mapping_ops = NULL,
+ .raw_acl = NULL,
+ .private = NULL
+ };
+ acl_info.raw_acl = acl;
- if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
- process_one_v4_ace(&effective_acl_state, ace);
- }
- *pacl = posix_state_to_acl(&effective_acl_state, flags);
- if (IS_ERR(*pacl)) {
- ret = PTR_ERR(*pacl);
- *pacl = NULL;
- goto out_dstate;
- }
- *dpacl = posix_state_to_acl(&default_acl_state,
- flags | NFS4_ACL_TYPE_DEFAULT);
- if (IS_ERR(*dpacl)) {
- ret = PTR_ERR(*dpacl);
- *dpacl = NULL;
- posix_acl_release(*pacl);
- *pacl = NULL;
- goto out_dstate;
- }
- sort_pacl(*pacl);
- sort_pacl(*dpacl);
- ret = 0;
-out_dstate:
- free_state(&default_acl_state);
-out_estate:
- free_state(&effective_acl_state);
- return ret;
-}
-
-static short
-ace2type(struct nfs4_ace *ace)
-{
- switch (ace->whotype) {
- case NFS4_ACL_WHO_NAMED:
- return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
- ACL_GROUP : ACL_USER);
- case NFS4_ACL_WHO_OWNER:
- return ACL_USER_OBJ;
- case NFS4_ACL_WHO_GROUP:
- return ACL_GROUP_OBJ;
- case NFS4_ACL_WHO_EVERYONE:
- return ACL_OTHER;
- }
- BUG();
- return -1;
+ return map_nfsv4_acl_to_posix(&init_user_ns, &acl_info,
+ pacl, dpacl, flags);
}
EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4);
EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix);
-struct nfs4_acl *
-nfs4_acl_new(int n)
-{
- struct nfs4_acl *acl;
-
- acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL);
- if (acl == NULL)
- return NULL;
- acl->naces = 0;
- return acl;
-}
-
static struct {
char *string;
int stringlen;
@@ -835,8 +135,7 @@ static struct {
},
};
-int
-nfs4_acl_get_whotype(char *p, u32 len)
+int nfs4_acl_get_whotype(char *p, u32 len)
{
int i;
@@ -848,8 +147,7 @@ nfs4_acl_get_whotype(char *p, u32 len)
return NFS4_ACL_WHO_NAMED;
}
-int
-nfs4_acl_write_who(int who, char *p)
+int nfs4_acl_write_who(int who, char *p)
{
int i;
--
1.7.9.5
--
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