/* * Common NFSv4 ACL handling code. * * Copyright (c) 2002, 2003 The Regents of the University of Michigan. * All rights reserved. * * Marius Aamodt Eriksen * Jeff Sedlak * J. Bruce Fields * * 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 #include #include #include "nfsfh.h" #include "nfsd.h" #include "acl.h" #include "vfs.h" #define NFS4_ACL_TYPE_DEFAULT 0x01 #define NFS4_ACL_DIR 0x02 #define NFS4_ACL_OWNER 0x04 /* 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) /* 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) static u32 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 u32 deny_mask_from_posix(unsigned short perm, u32 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 expect 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) { 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 short ace2type(struct nfs4_ace *); static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, unsigned int); int nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) { struct inode *inode = d_inode(dentry); int error = 0; struct posix_acl *pacl = NULL, *dpacl = NULL; unsigned int flags = 0; int size = 0; pacl = get_inode_acl(inode, ACL_TYPE_ACCESS); if (!pacl) pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); if (IS_ERR(pacl)) return PTR_ERR(pacl); /* allocate for worst case: one (deny, allow) pair each: */ size += 2 * pacl->a_count; if (S_ISDIR(inode->i_mode)) { flags = NFS4_ACL_DIR; dpacl = get_inode_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(dpacl)) { error = PTR_ERR(dpacl); goto rel_pacl; } if (dpacl) size += 2 * dpacl->a_count; } *acl = kmalloc(nfs4_acl_bytes(size), GFP_KERNEL); if (*acl == NULL) { error = -ENOMEM; goto out; } (*acl)->naces = 0; _posix_to_nfsv4_one(pacl, *acl, flags & ~NFS4_ACL_TYPE_DEFAULT); if (dpacl) _posix_to_nfsv4_one(dpacl, *acl, flags | NFS4_ACL_TYPE_DEFAULT); out: posix_acl_release(dpacl); rel_pacl: posix_acl_release(pacl); return error; } 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; 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; /* 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; swap(pacl->a_entries[i], pacl->a_entries[i + 1]); } } } } 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; /* no users or groups */ if (!pacl || pacl->a_count <= 4) return; 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 { unsigned char valid; 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)); /* * In the worst case, each individual acl could be for a distinct * named user or group, but we don't know 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; } 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; /* * ACLs with no ACEs are treated differently in the inheritable * and effective cases: when there are no inheritable ACEs, * calls ->set_acl with a NULL ACL structure. */ if (!state->valid && (flags & NFS4_ACL_TYPE_DEFAULT)) return NULL; /* * When there are no effective ACEs, the following will end * up setting a 3-element effective posix ACL with all * permissions zero. */ if (!state->users->n && !state->groups->n) nace = 3; else /* Note we also include a MASK ACE in this case: */ 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; 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; 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); } pace++; pace->e_tag = ACL_GROUP_OBJ; 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; 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 (state->users->n || state->groups->n) { pace++; pace->e_tag = ACL_MASK; low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags); } pace++; pace->e_tag = ACL_OTHER; low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags); return pacl; } 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; short type = ace2type(ace); int i; state->valid |= type; switch (type) { 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); } } } static 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); if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE)) process_one_v4_ace(&effective_acl_state, ace); } /* * At this point, the default ACL may have zeroed-out entries for owner, * group and other. That usually results in a non-sensical resulting ACL * that denies all access except to any ACE that was explicitly added. * * The setfacl command solves a similar problem with this logic: * * "If a Default ACL entry is created, and the Default ACL contains * no owner, owning group, or others entry, a copy of the ACL * owner, owning group, or others entry is added to the Default ACL." * * Copy any missing ACEs from the effective set, if any ACEs were * explicitly set. */ if (default_acl_state.valid) { if (!(default_acl_state.valid & ACL_USER_OBJ)) default_acl_state.owner = effective_acl_state.owner; if (!(default_acl_state.valid & ACL_GROUP_OBJ)) default_acl_state.group = effective_acl_state.group; if (!(default_acl_state.valid & ACL_OTHER)) default_acl_state.other = effective_acl_state.other; } *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; } __be32 nfsd4_acl_to_attr(enum nfs_ftype4 type, struct nfs4_acl *acl, struct nfsd_attrs *attr) { int host_error; unsigned int flags = 0; if (!acl) return nfs_ok; if (type == NF4DIR) flags = NFS4_ACL_DIR; host_error = nfs4_acl_nfsv4_to_posix(acl, &attr->na_pacl, &attr->na_dpacl, flags); if (host_error == -EINVAL) return nfserr_attrnotsupp; else return nfserrno(host_error); } 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 the size of the struct nfs4_acl required to represent an acl * with @entries entries. */ int nfs4_acl_bytes(int entries) { return sizeof(struct nfs4_acl) + entries * sizeof(struct nfs4_ace); } static struct { char *string; int stringlen; int type; } s2t_map[] = { { .string = "OWNER@", .stringlen = sizeof("OWNER@") - 1, .type = NFS4_ACL_WHO_OWNER, }, { .string = "GROUP@", .stringlen = sizeof("GROUP@") - 1, .type = NFS4_ACL_WHO_GROUP, }, { .string = "EVERYONE@", .stringlen = sizeof("EVERYONE@") - 1, .type = NFS4_ACL_WHO_EVERYONE, }, }; int nfs4_acl_get_whotype(char *p, u32 len) { int i; for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { if (s2t_map[i].stringlen == len && 0 == memcmp(s2t_map[i].string, p, len)) return s2t_map[i].type; } return NFS4_ACL_WHO_NAMED; } __be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who) { __be32 *p; int i; for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { if (s2t_map[i].type != who) continue; p = xdr_reserve_space(xdr, s2t_map[i].stringlen + 4); if (!p) return nfserr_resource; p = xdr_encode_opaque(p, s2t_map[i].string, s2t_map[i].stringlen); return 0; } WARN_ON_ONCE(1); return nfserr_serverfault; }