From 22c1ea44f0d33eda532883858b6cdabc5f265b66 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Tue, 11 Oct 2005 08:29:05 -0700 Subject: [PATCH] [PATCH] nfsacl: Solaris VxFS compatibility fix Here is a compatibility fix between Linux and Solaris when used with VxFS filesystems: Solaris usually accepts acl entries in any order, but with VxFS it replies with NFSERR_INVAL when it sees a four-entry acl that is not in canonical form. It may also fail with other non-canonical acls -- I can't tell, because that case never triggers: We only send non-canonical acls when we fake up an ACL_MASK entry. Instead of adding fake ACL_MASK entries at the end, inserting them in the correct position makes Solaris+VxFS happy. The Linux client and server sides don't care about entry order. The three-entry-acl special case in which we need a fake ACL_MASK entry was handled in xdr_nfsace_encode. The patch moves this into nfsacl_encode. Signed-off-by: Andreas Gruenbacher Acked-by: Trond Myklebust Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfs_common/nfsacl.c | 70 +++++++++++++++++++++--------------------- 1 file changed, 35 insertions(+), 35 deletions(-) diff --git a/fs/nfs_common/nfsacl.c b/fs/nfs_common/nfsacl.c index 251e5a1bb1..0c2be8c030 100644 --- a/fs/nfs_common/nfsacl.c +++ b/fs/nfs_common/nfsacl.c @@ -48,43 +48,26 @@ xdr_nfsace_encode(struct xdr_array2_desc *desc, void *elem) (struct nfsacl_encode_desc *) desc; u32 *p = (u32 *) elem; - if (nfsacl_desc->count < nfsacl_desc->acl->a_count) { - struct posix_acl_entry *entry = - &nfsacl_desc->acl->a_entries[nfsacl_desc->count++]; + struct posix_acl_entry *entry = + &nfsacl_desc->acl->a_entries[nfsacl_desc->count++]; - *p++ = htonl(entry->e_tag | nfsacl_desc->typeflag); - switch(entry->e_tag) { - case ACL_USER_OBJ: - *p++ = htonl(nfsacl_desc->uid); - break; - case ACL_GROUP_OBJ: - *p++ = htonl(nfsacl_desc->gid); - break; - case ACL_USER: - case ACL_GROUP: - *p++ = htonl(entry->e_id); - break; - default: /* Solaris depends on that! */ - *p++ = 0; - break; - } - *p++ = htonl(entry->e_perm & S_IRWXO); - } else { - const struct posix_acl_entry *pa, *pe; - int group_obj_perm = ACL_READ|ACL_WRITE|ACL_EXECUTE; - - FOREACH_ACL_ENTRY(pa, nfsacl_desc->acl, pe) { - if (pa->e_tag == ACL_GROUP_OBJ) { - group_obj_perm = pa->e_perm & S_IRWXO; - break; - } - } - /* fake up ACL_MASK entry */ - *p++ = htonl(ACL_MASK | nfsacl_desc->typeflag); - *p++ = htonl(0); - *p++ = htonl(group_obj_perm); + *p++ = htonl(entry->e_tag | nfsacl_desc->typeflag); + switch(entry->e_tag) { + case ACL_USER_OBJ: + *p++ = htonl(nfsacl_desc->uid); + break; + case ACL_GROUP_OBJ: + *p++ = htonl(nfsacl_desc->gid); + break; + case ACL_USER: + case ACL_GROUP: + *p++ = htonl(entry->e_id); + break; + default: /* Solaris depends on that! */ + *p++ = 0; + break; } - + *p++ = htonl(entry->e_perm & S_IRWXO); return 0; } @@ -105,11 +88,28 @@ nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode, .gid = inode->i_gid, }; int err; + struct posix_acl *acl2 = NULL; if (entries > NFS_ACL_MAX_ENTRIES || xdr_encode_word(buf, base, entries)) return -EINVAL; + if (encode_entries && acl && acl->a_count == 3) { + /* Fake up an ACL_MASK entry. */ + acl2 = posix_acl_alloc(4, GFP_KERNEL); + if (!acl2) + return -ENOMEM; + /* Insert entries in canonical order: other orders seem + to confuse Solaris VxFS. */ + acl2->a_entries[0] = acl->a_entries[0]; /* ACL_USER_OBJ */ + acl2->a_entries[1] = acl->a_entries[1]; /* ACL_GROUP_OBJ */ + acl2->a_entries[2] = acl->a_entries[1]; /* ACL_MASK */ + acl2->a_entries[2].e_tag = ACL_MASK; + acl2->a_entries[3] = acl->a_entries[2]; /* ACL_OTHER */ + nfsacl_desc.acl = acl2; + } err = xdr_encode_array2(buf, base + 4, &nfsacl_desc.desc); + if (acl2) + posix_acl_release(acl2); if (!err) err = 8 + nfsacl_desc.desc.elem_size * nfsacl_desc.desc.array_len; -- 2.39.5