[PATCH] NFS: Add support for NFSv3 ACLs

 This adds acl support fo nfs clients via the NFSACL protocol extension, by
 implementing the getxattr, listxattr, setxattr, and removexattr iops for the
 system.posix_acl_access and system.posix_acl_default attributes.  This patch
 implements a dumb version that uses no caching (and thus adds some overhead).
 (Another patch in this patchset adds caching as well.)

 Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
 Acked-by: Olaf Kirch <okir@suse.de>
 Signed-off-by: Andrew Morton <akpm@osdl.org>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

9 files changed, 541 insertions, 6 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index d44b04d9b0a..a7c0cc3203c 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1268,6 +1268,7 @@ config NFS_FS
         depends on INET
         select LOCKD
         select SUNRPC
+        select NFS_ACL_SUPPORT if NFS_V3_ACL
         help
           If you are connected to some other (usually local) Unix computer
           (using SLIP, PLIP, PPP or Ethernet) and want to mount files residing
@@ -1310,6 +1311,16 @@ config NFS_V3
 
           If unsure, say Y.
 
+config NFS_V3_ACL
+        bool "Provide client support for the NFSv3 ACL protocol extension"
+        depends on NFS_V3
+        help
+          Implement the NFSv3 ACL protocol extension for manipulating POSIX
+          Access Control Lists.  The server should also be compiled with
+          the NFSv3 ACL protocol extension; see the CONFIG_NFSD_V3_ACL option.
+
+          If unsure, say N.
+
 config NFS_V4
         bool "Provide NFSv4 client support (EXPERIMENTAL)"
         depends on NFS_FS && EXPERIMENTAL
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index b4baa031edf..8b3bb715d17 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -8,6 +8,7 @@ nfs-y 			:= dir.o file.o inode.o nfs2xdr.o pagelist.o \
                            proc.o read.o symlink.o unlink.o write.o
 nfs-$(CONFIG_ROOT_NFS)  += nfsroot.o mount_clnt.o      
 nfs-$(CONFIG_NFS_V3)    += nfs3proc.o nfs3xdr.o
+nfs-$(CONFIG_NFS_V3_ACL)        += nfs3acl.o
 nfs-$(CONFIG_NFS_V4)    += nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o \
                            delegation.o idmap.o \
                            callback.o callback_xdr.o callback_proc.o
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 5720537bffd..2c6a9594568 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -75,6 +75,27 @@ struct inode_operations nfs_dir_inode_operations = {
         .setattr        = nfs_setattr,
 };
 
+#ifdef CONFIG_NFS_V3
+struct inode_operations nfs3_dir_inode_operations = {
+        .create         = nfs_create,
+        .lookup         = nfs_lookup,
+        .link           = nfs_link,
+        .unlink         = nfs_unlink,
+        .symlink        = nfs_symlink,
+        .mkdir          = nfs_mkdir,
+        .rmdir          = nfs_rmdir,
+        .mknod          = nfs_mknod,
+        .rename         = nfs_rename,
+        .permission     = nfs_permission,
+        .getattr        = nfs_getattr,
+        .setattr        = nfs_setattr,
+        .listxattr      = nfs3_listxattr,
+        .getxattr       = nfs3_getxattr,
+        .setxattr       = nfs3_setxattr,
+        .removexattr    = nfs3_removexattr,
+};
+#endif  /* CONFIG_NFS_V3 */
+
 #ifdef CONFIG_NFS_V4
 
 static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *);
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 55c90759249..a606708264e 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -71,6 +71,18 @@ struct inode_operations nfs_file_inode_operations = {
         .setattr        = nfs_setattr,
 };
 
+#ifdef CONFIG_NFS_V3
+struct inode_operations nfs3_file_inode_operations = {
+        .permission     = nfs_permission,
+        .getattr        = nfs_getattr,
+        .setattr        = nfs_setattr,
+        .listxattr      = nfs3_listxattr,
+        .getxattr       = nfs3_getxattr,
+        .setxattr       = nfs3_setxattr,
+        .removexattr    = nfs3_removexattr,
+};
+#endif  /* CONFIG_NFS_v3 */
+
 /* Hack for future NFS swap support */
 #ifndef IS_SWAPFILE
 # define IS_SWAPFILE(inode)     (0)
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 97b3fe7ece6..440b9cbb6f8 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -108,6 +108,21 @@ static struct rpc_program	nfs_program = {
         .pipe_dir_name          = "/nfs",
 };
 
+#ifdef CONFIG_NFS_V3_ACL
+static struct rpc_stat          nfsacl_rpcstat = { &nfsacl_program };
+static struct rpc_version *     nfsacl_version[] = {
+        [3]                     = &nfsacl_version3,
+};
+
+struct rpc_program              nfsacl_program = {
+        .name =                 "nfsacl",
+        .number =               NFS_ACL_PROGRAM,
+        .nrvers =               sizeof(nfsacl_version) / sizeof(nfsacl_version[0]),
+        .version =              nfsacl_version,
+        .stats =                &nfsacl_rpcstat,
+};
+#endif  /* CONFIG_NFS_V3_ACL */
+
 static inline unsigned long
 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
 {
@@ -165,6 +180,9 @@ nfs_umount_begin(struct super_block *sb)
         /* -EIO all pending I/O */
         if (!IS_ERR(rpc))
                 rpc_killall_tasks(rpc);
+        rpc = NFS_SB(sb)->client_acl;
+        if (!IS_ERR(rpc))
+                rpc_killall_tasks(rpc);
 }
 
 
@@ -461,8 +479,17 @@ nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
                 atomic_inc(&server->client->cl_count);
                 server->client_sys = server->client;
         }
-
         if (server->flags & NFS_MOUNT_VER3) {
+#ifdef CONFIG_NFS_V3_ACL
+                if (!(server->flags & NFS_MOUNT_NOACL)) {
+                        server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
+                        /* No errors! Assume that Sun nfsacls are supported */
+                        if (!IS_ERR(server->client_acl))
+                                server->caps |= NFS_CAP_ACLS;
+                }
+#else
+                server->flags &= ~NFS_MOUNT_NOACL;
+#endif /* CONFIG_NFS_V3_ACL */
                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
                         server->namelen = NFS3_MAXNAMLEN;
                 sb->s_time_gran = 1;
@@ -546,6 +573,7 @@ static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
                 { NFS_MOUNT_NOCTO, ",nocto", "" },
                 { NFS_MOUNT_NOAC, ",noac", "" },
                 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
+                { NFS_MOUNT_NOACL, ",noacl", "" },
                 { 0, NULL, NULL }
         };
         struct proc_nfs_info *nfs_infop;
@@ -1452,7 +1480,7 @@ static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
         memset(server, 0, sizeof(struct nfs_server));
         /* Zero out the NFS state stuff */
         init_nfsv4_state(server);
-        server->client = server->client_sys = ERR_PTR(-EINVAL);
+        server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
 
         root = &server->fh;
         if (data->flags & NFS_MOUNT_VER3)
@@ -1513,6 +1541,8 @@ static void nfs_kill_super(struct super_block *s)
                 rpc_shutdown_client(server->client);
         if (!IS_ERR(server->client_sys))
                 rpc_shutdown_client(server->client_sys);
+        if (!IS_ERR(server->client_acl))
+                rpc_shutdown_client(server->client_acl);
 
         if (!(server->flags & NFS_MOUNT_NONLM))
                 lockd_down();   /* release rpc.lockd */
@@ -1794,7 +1824,7 @@ static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
         memset(server, 0, sizeof(struct nfs_server));
         /* Zero out the NFS state stuff */
         init_nfsv4_state(server);
-        server->client = server->client_sys = ERR_PTR(-EINVAL);
+        server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
 
         p = nfs_copy_user_string(NULL, &data->hostname, 256);
         if (IS_ERR(p))
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
new file mode 100644
index 00000000000..393ba79fc14
--- /dev/null
+++ b/fs/nfs/nfs3acl.c
@@ -0,0 +1,303 @@
+#include <linux/fs.h>
+#include <linux/nfs.h>
+#include <linux/nfs3.h>
+#include <linux/nfs_fs.h>
+#include <linux/xattr_acl.h>
+#include <linux/nfsacl.h>
+
+#define NFSDBG_FACILITY NFSDBG_PROC
+
+ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+        struct inode *inode = dentry->d_inode;
+        struct posix_acl *acl;
+        int pos=0, len=0;
+
+#       define output(s) do {                                           \
+                        if (pos + sizeof(s) <= size) {                  \
+                                memcpy(buffer + pos, s, sizeof(s));     \
+                                pos += sizeof(s);                       \
+                        }                                               \
+                        len += sizeof(s);                               \
+                } while(0)
+
+        acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        if (acl) {
+                output("system.posix_acl_access");
+                posix_acl_release(acl);
+        }
+
+        if (S_ISDIR(inode->i_mode)) {
+                acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
+                if (IS_ERR(acl))
+                        return PTR_ERR(acl);
+                if (acl) {
+                        output("system.posix_acl_default");
+                        posix_acl_release(acl);
+                }
+        }
+
+#       undef output
+
+        if (!buffer || len <= size)
+                return len;
+        return -ERANGE;
+}
+
+ssize_t nfs3_getxattr(struct dentry *dentry, const char *name,
+                void *buffer, size_t size)
+{
+        struct inode *inode = dentry->d_inode;
+        struct posix_acl *acl;
+        int type, error = 0;
+
+        if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0)
+                type = ACL_TYPE_ACCESS;
+        else if (strcmp(name, XATTR_NAME_ACL_DEFAULT) == 0)
+                type = ACL_TYPE_DEFAULT;
+        else
+                return -EOPNOTSUPP;
+
+        acl = nfs3_proc_getacl(inode, type);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        else if (acl) {
+                if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
+                        error = -ENODATA;
+                else
+                        error = posix_acl_to_xattr(acl, buffer, size);
+                posix_acl_release(acl);
+        } else
+                error = -ENODATA;
+
+        return error;
+}
+
+int nfs3_setxattr(struct dentry *dentry, const char *name,
+             const void *value, size_t size, int flags)
+{
+        struct inode *inode = dentry->d_inode;
+        struct posix_acl *acl;
+        int type, error;
+
+        if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0)
+                type = ACL_TYPE_ACCESS;
+        else if (strcmp(name, XATTR_NAME_ACL_DEFAULT) == 0)
+                type = ACL_TYPE_DEFAULT;
+        else
+                return -EOPNOTSUPP;
+
+        acl = posix_acl_from_xattr(value, size);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        error = nfs3_proc_setacl(inode, type, acl);
+        posix_acl_release(acl);
+
+        return error;
+}
+
+int nfs3_removexattr(struct dentry *dentry, const char *name)
+{
+        struct inode *inode = dentry->d_inode;
+        int type;
+
+        if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0)
+                type = ACL_TYPE_ACCESS;
+        else if (strcmp(name, XATTR_NAME_ACL_DEFAULT) == 0)
+                type = ACL_TYPE_DEFAULT;
+        else
+                return -EOPNOTSUPP;
+
+        return nfs3_proc_setacl(inode, type, NULL);
+}
+
+struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
+{
+        struct nfs_server *server = NFS_SERVER(inode);
+        struct nfs_fattr fattr;
+        struct page *pages[NFSACL_MAXPAGES] = { };
+        struct nfs3_getaclargs args = {
+                .fh = NFS_FH(inode),
+                /* The xdr layer may allocate pages here. */
+                .pages = pages,
+        };
+        struct nfs3_getaclres res = {
+                .fattr =        &fattr,
+        };
+        struct posix_acl *acl = NULL;
+        int status, count;
+
+        if (!nfs_server_capable(inode, NFS_CAP_ACLS))
+                return ERR_PTR(-EOPNOTSUPP);
+
+        switch (type) {
+                case ACL_TYPE_ACCESS:
+                        args.mask = NFS_ACLCNT|NFS_ACL;
+                        break;
+
+                case ACL_TYPE_DEFAULT:
+                        if (!S_ISDIR(inode->i_mode))
+                                return NULL;
+                        args.mask = NFS_DFACLCNT|NFS_DFACL;
+                        break;
+
+                default:
+                        return ERR_PTR(-EINVAL);
+        }
+
+        dprintk("NFS call getacl\n");
+        status = rpc_call(server->client_acl, ACLPROC3_GETACL,
+                          &args, &res, 0);
+        dprintk("NFS reply getacl: %d\n", status);
+
+        /* pages may have been allocated at the xdr layer. */
+        for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
+                __free_page(args.pages[count]);
+
+        switch (status) {
+                case 0:
+                        status = nfs_refresh_inode(inode, &fattr);
+                        break;
+                case -EPFNOSUPPORT:
+                case -EPROTONOSUPPORT:
+                        dprintk("NFS_V3_ACL extension not supported; disabling\n");
+                        server->caps &= ~NFS_CAP_ACLS;
+                case -ENOTSUPP:
+                        status = -EOPNOTSUPP;
+                default:
+                        goto getout;
+        }
+        if ((args.mask & res.mask) != args.mask) {
+                status = -EIO;
+                goto getout;
+        }
+
+        if (res.acl_access != NULL) {
+                if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
+                        posix_acl_release(res.acl_access);
+                        res.acl_access = NULL;
+                }
+        }
+
+        switch(type) {
+                case ACL_TYPE_ACCESS:
+                        acl = res.acl_access;
+                        res.acl_access = NULL;
+                        break;
+
+                case ACL_TYPE_DEFAULT:
+                        acl = res.acl_default;
+                        res.acl_default = NULL;
+        }
+
+getout:
+        posix_acl_release(res.acl_access);
+        posix_acl_release(res.acl_default);
+
+        if (status != 0) {
+                posix_acl_release(acl);
+                acl = ERR_PTR(status);
+        }
+        return acl;
+}
+
+static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
+                  struct posix_acl *dfacl)
+{
+        struct nfs_server *server = NFS_SERVER(inode);
+        struct nfs_fattr fattr;
+        struct page *pages[NFSACL_MAXPAGES] = { };
+        struct nfs3_setaclargs args = {
+                .inode = inode,
+                .mask = NFS_ACL,
+                .acl_access = acl,
+                .pages = pages,
+        };
+        int status, count;
+
+        status = -EOPNOTSUPP;
+        if (!nfs_server_capable(inode, NFS_CAP_ACLS))
+                goto out;
+
+        /* We are doing this here, because XDR marshalling can only
+           return -ENOMEM. */
+        status = -ENOSPC;
+        if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
+                goto out;
+        if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
+                goto out;
+        if (S_ISDIR(inode->i_mode)) {
+                args.mask |= NFS_DFACL;
+                args.acl_default = dfacl;
+        }
+
+        dprintk("NFS call setacl\n");
+        nfs_begin_data_update(inode);
+        status = rpc_call(server->client_acl, ACLPROC3_SETACL,
+                          &args, &fattr, 0);
+        NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS;
+        nfs_end_data_update(inode);
+        dprintk("NFS reply setacl: %d\n", status);
+
+        /* pages may have been allocated at the xdr layer. */
+        for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
+                __free_page(args.pages[count]);
+
+        switch (status) {
+                case 0:
+                        status = nfs_refresh_inode(inode, &fattr);
+                        break;
+                case -EPFNOSUPPORT:
+                case -EPROTONOSUPPORT:
+                        dprintk("NFS_V3_ACL SETACL RPC not supported"
+                                        "(will not retry)\n");
+                        server->caps &= ~NFS_CAP_ACLS;
+                case -ENOTSUPP:
+                        status = -EOPNOTSUPP;
+        }
+out:
+        return status;
+}
+
+int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl)
+{
+        struct posix_acl *alloc = NULL, *dfacl = NULL;
+        int status;
+
+        if (S_ISDIR(inode->i_mode)) {
+                switch(type) {
+                        case ACL_TYPE_ACCESS:
+                                alloc = dfacl = nfs3_proc_getacl(inode,
+                                                ACL_TYPE_DEFAULT);
+                                if (IS_ERR(alloc))
+                                        goto fail;
+                                break;
+
+                        case ACL_TYPE_DEFAULT:
+                                dfacl = acl;
+                                alloc = acl = nfs3_proc_getacl(inode,
+                                                ACL_TYPE_ACCESS);
+                                if (IS_ERR(alloc))
+                                        goto fail;
+                                break;
+
+                        default:
+                                return -EINVAL;
+                }
+        } else if (type != ACL_TYPE_ACCESS)
+                        return -EINVAL;
+
+        if (acl == NULL) {
+                alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
+                if (IS_ERR(alloc))
+                        goto fail;
+        }
+        status = nfs3_proc_setacls(inode, acl, dfacl);
+        posix_acl_release(alloc);
+        return status;
+
+fail:
+        return PTR_ERR(alloc);
+}
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 53953a77571..d03bac0cc42 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -17,6 +17,7 @@
 #include <linux/nfs_page.h>
 #include <linux/lockd/bind.h>
 #include <linux/smp_lock.h>
+#include <linux/nfs_mount.h>
 
 #define NFSDBG_FACILITY         NFSDBG_PROC
 
@@ -45,7 +46,7 @@ static inline int
 nfs3_rpc_call_wrapper(struct rpc_clnt *clnt, u32 proc, void *argp, void *resp, int flags)
 {
         struct rpc_message msg = {
-                .rpc_proc       = &nfs3_procedures[proc],
+                .rpc_proc       = &clnt->cl_procinfo[proc],
                 .rpc_argp       = argp,
                 .rpc_resp       = resp,
         };
@@ -825,8 +826,8 @@ nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 struct nfs_rpc_ops      nfs_v3_clientops = {
         .version        = 3,                    /* protocol version */
         .dentry_ops     = &nfs_dentry_operations,
-        .dir_inode_ops  = &nfs_dir_inode_operations,
-        .file_inode_ops = &nfs_file_inode_operations,
+        .dir_inode_ops  = &nfs3_dir_inode_operations,
+        .file_inode_ops = &nfs3_file_inode_operations,
         .getroot        = nfs3_proc_get_root,
         .getattr        = nfs3_proc_getattr,
         .setattr        = nfs3_proc_setattr,
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index a3593d47e5a..a4437fb177f 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -21,6 +21,7 @@
 #include <linux/nfs.h>
 #include <linux/nfs3.h>
 #include <linux/nfs_fs.h>
+#include <linux/nfsacl.h>
 
 #define NFSDBG_FACILITY         NFSDBG_XDR
 
@@ -79,6 +80,11 @@ extern int			nfs_stat_to_errno(int);
 #define NFS3_pathconfres_sz     (1+NFS3_post_op_attr_sz+6)
 #define NFS3_commitres_sz       (1+NFS3_wcc_data_sz+2)
 
+#define ACL3_getaclargs_sz      (NFS3_fh_sz+1)
+#define ACL3_setaclargs_sz      (NFS3_fh_sz+1+2*(2+5*3))
+#define ACL3_getaclres_sz       (1+NFS3_post_op_attr_sz+1+2*(2+5*3))
+#define ACL3_setaclres_sz       (1+NFS3_post_op_attr_sz)
+
 /*
  * Map file type to S_IFMT bits
  */
@@ -627,6 +633,74 @@ nfs3_xdr_commitargs(struct rpc_rqst *req, u32 *p, struct nfs_writeargs *args)
         return 0;
 }
 
+#ifdef CONFIG_NFS_V3_ACL
+/*
+ * Encode GETACL arguments
+ */
+static int
+nfs3_xdr_getaclargs(struct rpc_rqst *req, u32 *p,
+                    struct nfs3_getaclargs *args)
+{
+        struct rpc_auth *auth = req->rq_task->tk_auth;
+        unsigned int replen;
+
+        p = xdr_encode_fhandle(p, args->fh);
+        *p++ = htonl(args->mask);
+        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+
+        if (args->mask & (NFS_ACL | NFS_DFACL)) {
+                /* Inline the page array */
+                replen = (RPC_REPHDRSIZE + auth->au_rslack +
+                          ACL3_getaclres_sz) << 2;
+                xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0,
+                                 NFSACL_MAXPAGES << PAGE_SHIFT);
+        }
+        return 0;
+}
+
+/*
+ * Encode SETACL arguments
+ */
+static int
+nfs3_xdr_setaclargs(struct rpc_rqst *req, u32 *p,
+                   struct nfs3_setaclargs *args)
+{
+        struct xdr_buf *buf = &req->rq_snd_buf;
+        unsigned int base, len_in_head, len = nfsacl_size(
+                (args->mask & NFS_ACL)   ? args->acl_access  : NULL,
+                (args->mask & NFS_DFACL) ? args->acl_default : NULL);
+        int count, err;
+
+        p = xdr_encode_fhandle(p, NFS_FH(args->inode));
+        *p++ = htonl(args->mask);
+        base = (char *)p - (char *)buf->head->iov_base;
+        /* put as much of the acls into head as possible. */
+        len_in_head = min_t(unsigned int, buf->head->iov_len - base, len);
+        len -= len_in_head;
+        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p + len_in_head);
+
+        for (count = 0; (count << PAGE_SHIFT) < len; count++) {
+                args->pages[count] = alloc_page(GFP_KERNEL);
+                if (!args->pages[count]) {
+                        while (count)
+                                __free_page(args->pages[--count]);
+                        return -ENOMEM;
+                }
+        }
+        xdr_encode_pages(buf, args->pages, 0, len);
+
+        err = nfsacl_encode(buf, base, args->inode,
+                            (args->mask & NFS_ACL) ?
+                            args->acl_access : NULL, 1, 0);
+        if (err > 0)
+                err = nfsacl_encode(buf, base + err, args->inode,
+                                    (args->mask & NFS_DFACL) ?
+                                    args->acl_default : NULL, 1,
+                                    NFS_ACL_DEFAULT);
+        return (err > 0) ? 0 : err;
+}
+#endif  /* CONFIG_NFS_V3_ACL */
+
 /*
  * NFS XDR decode functions
  */
@@ -978,6 +1052,54 @@ nfs3_xdr_commitres(struct rpc_rqst *req, u32 *p, struct nfs_writeres *res)
         return 0;
 }
 
+#ifdef CONFIG_NFS_V3_ACL
+/*
+ * Decode GETACL reply
+ */
+static int
+nfs3_xdr_getaclres(struct rpc_rqst *req, u32 *p,
+                   struct nfs3_getaclres *res)
+{
+        struct xdr_buf *buf = &req->rq_rcv_buf;
+        int status = ntohl(*p++);
+        struct posix_acl **acl;
+        unsigned int *aclcnt;
+        int err, base;
+
+        if (status != 0)
+                return -nfs_stat_to_errno(status);
+        p = xdr_decode_post_op_attr(p, res->fattr);
+        res->mask = ntohl(*p++);
+        if (res->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
+                return -EINVAL;
+        base = (char *)p - (char *)req->rq_rcv_buf.head->iov_base;
+
+        acl = (res->mask & NFS_ACL) ? &res->acl_access : NULL;
+        aclcnt = (res->mask & NFS_ACLCNT) ? &res->acl_access_count : NULL;
+        err = nfsacl_decode(buf, base, aclcnt, acl);
+
+        acl = (res->mask & NFS_DFACL) ? &res->acl_default : NULL;
+        aclcnt = (res->mask & NFS_DFACLCNT) ? &res->acl_default_count : NULL;
+        if (err > 0)
+                err = nfsacl_decode(buf, base + err, aclcnt, acl);
+        return (err > 0) ? 0 : err;
+}
+
+/*
+ * Decode setacl reply.
+ */
+static int
+nfs3_xdr_setaclres(struct rpc_rqst *req, u32 *p, struct nfs_fattr *fattr)
+{
+        int status = ntohl(*p++);
+
+        if (status)
+                return -nfs_stat_to_errno(status);
+        xdr_decode_post_op_attr(p, fattr);
+        return 0;
+}
+#endif  /* CONFIG_NFS_V3_ACL */
+
 #ifndef MAX
 # define MAX(a, b)      (((a) > (b))? (a) : (b))
 #endif
@@ -1021,3 +1143,28 @@ struct rpc_version		nfs_version3 = {
         .procs                  = nfs3_procedures
 };
 
+#ifdef CONFIG_NFS_V3_ACL
+static struct rpc_procinfo      nfs3_acl_procedures[] = {
+        [ACLPROC3_GETACL] = {
+                .p_proc = ACLPROC3_GETACL,
+                .p_encode = (kxdrproc_t) nfs3_xdr_getaclargs,
+                .p_decode = (kxdrproc_t) nfs3_xdr_getaclres,
+                .p_bufsiz = MAX(ACL3_getaclargs_sz, ACL3_getaclres_sz) << 2,
+                .p_timer = 1,
+        },
+        [ACLPROC3_SETACL] = {
+                .p_proc = ACLPROC3_SETACL,
+                .p_encode = (kxdrproc_t) nfs3_xdr_setaclargs,
+                .p_decode = (kxdrproc_t) nfs3_xdr_setaclres,
+                .p_bufsiz = MAX(ACL3_setaclargs_sz, ACL3_setaclres_sz) << 2,
+                .p_timer = 0,
+        },
+};
+
+struct rpc_version              nfsacl_version3 = {
+        .number                 = 3,
+        .nrprocs                = sizeof(nfs3_acl_procedures)/
+                                  sizeof(nfs3_acl_procedures[0]),
+        .procs                  = nfs3_acl_procedures,
+};
+#endif  /* CONFIG_NFS_V3_ACL */
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index fd5bc596fe8..1b272a135a3 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -124,6 +124,7 @@ enum {
         Opt_soft, Opt_hard, Opt_intr,
         Opt_nointr, Opt_posix, Opt_noposix, Opt_cto, Opt_nocto, Opt_ac, 
         Opt_noac, Opt_lock, Opt_nolock, Opt_v2, Opt_v3, Opt_udp, Opt_tcp,
+        Opt_acl, Opt_noacl,
         /* Error token */
         Opt_err
 };
@@ -158,6 +159,8 @@ static match_table_t __initdata tokens = {
         {Opt_udp, "udp"},
         {Opt_tcp, "proto=tcp"},
         {Opt_tcp, "tcp"},
+        {Opt_acl, "acl"},
+        {Opt_noacl, "noacl"},
         {Opt_err, NULL}
         
 };
@@ -266,6 +269,12 @@ static int __init root_nfs_parse(char *name, char *buf)
                         case Opt_tcp:
                                 nfs_data.flags |= NFS_MOUNT_TCP;
                                 break;
+                        case Opt_acl:
+                                nfs_data.flags &= ~NFS_MOUNT_NOACL;
+                                break;
+                        case Opt_noacl:
+                                nfs_data.flags |= NFS_MOUNT_NOACL;
+                                break;
                         default : 
                                 return 0;
                 }