+void
+nfs_umount_begin(struct super_block *sb)
+{
+ struct rpc_clnt *rpc = NFS_SB(sb)->client;
+
+ /* -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);
+}
+
+
+static inline unsigned long
+nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
+{
+ /* make sure blocksize is a power of two */
+ if ((bsize & (bsize - 1)) || nrbitsp) {
+ unsigned char nrbits;
+
+ for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
+ ;
+ bsize = 1 << nrbits;
+ if (nrbitsp)
+ *nrbitsp = nrbits;
+ }
+
+ return bsize;
+}
+
+/*
+ * Calculate the number of 512byte blocks used.
+ */
+static inline unsigned long
+nfs_calc_block_size(u64 tsize)
+{
+ loff_t used = (tsize + 511) >> 9;
+ return (used > ULONG_MAX) ? ULONG_MAX : used;
+}
+
+/*
+ * Compute and set NFS server blocksize
+ */
+static inline unsigned long
+nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
+{
+ if (bsize < NFS_MIN_FILE_IO_SIZE)
+ bsize = NFS_DEF_FILE_IO_SIZE;
+ else if (bsize >= NFS_MAX_FILE_IO_SIZE)
+ bsize = NFS_MAX_FILE_IO_SIZE;
+
+ return nfs_block_bits(bsize, nrbitsp);
+}
+
+/*
+ * Obtain the root inode of the file system.
+ */
+static struct inode *
+nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
+{
+ struct nfs_server *server = NFS_SB(sb);
+ struct inode *rooti;
+ int error;
+
+ error = server->rpc_ops->getroot(server, rootfh, fsinfo);
+ if (error < 0) {
+ dprintk("nfs_get_root: getattr error = %d\n", -error);
+ return ERR_PTR(error);
+ }
+
+ rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
+ if (!rooti)
+ return ERR_PTR(-ENOMEM);
+ return rooti;
+}
+
+/*
+ * Do NFS version-independent mount processing, and sanity checking
+ */
+static int
+nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
+{
+ struct nfs_server *server;
+ struct inode *root_inode;
+ struct nfs_fattr fattr;
+ struct nfs_fsinfo fsinfo = {
+ .fattr = &fattr,
+ };
+ struct nfs_pathconf pathinfo = {
+ .fattr = &fattr,
+ };
+ int no_root_error = 0;
+ unsigned long max_rpc_payload;
+
+ /* We probably want something more informative here */
+ snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
+
+ server = NFS_SB(sb);
+
+ sb->s_magic = NFS_SUPER_MAGIC;
+
+ root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
+ /* Did getting the root inode fail? */
+ if (IS_ERR(root_inode)) {
+ no_root_error = PTR_ERR(root_inode);
+ goto out_no_root;
+ }
+ sb->s_root = d_alloc_root(root_inode);
+ if (!sb->s_root) {
+ no_root_error = -ENOMEM;
+ goto out_no_root;
+ }
+ sb->s_root->d_op = server->rpc_ops->dentry_ops;
+
+ /* Get some general file system info */
+ if (server->namelen == 0 &&
+ server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
+ server->namelen = pathinfo.max_namelen;
+ /* Work out a lot of parameters */
+ if (server->rsize == 0)
+ server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
+ if (server->wsize == 0)
+ server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
+
+ if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
+ server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
+ if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
+ server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
+
+ max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
+ if (server->rsize > max_rpc_payload)
+ server->rsize = max_rpc_payload;
+ if (server->rsize > NFS_MAX_FILE_IO_SIZE)
+ server->rsize = NFS_MAX_FILE_IO_SIZE;
+ server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+
+ if (server->wsize > max_rpc_payload)
+ server->wsize = max_rpc_payload;
+ if (server->wsize > NFS_MAX_FILE_IO_SIZE)
+ server->wsize = NFS_MAX_FILE_IO_SIZE;
+ server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+
+ if (sb->s_blocksize == 0)
+ sb->s_blocksize = nfs_block_bits(server->wsize,
+ &sb->s_blocksize_bits);
+ server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
+
+ server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
+ if (server->dtsize > PAGE_CACHE_SIZE)
+ server->dtsize = PAGE_CACHE_SIZE;
+ if (server->dtsize > server->rsize)
+ server->dtsize = server->rsize;
+
+ if (server->flags & NFS_MOUNT_NOAC) {
+ server->acregmin = server->acregmax = 0;
+ server->acdirmin = server->acdirmax = 0;
+ sb->s_flags |= MS_SYNCHRONOUS;
+ }
+ server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
+
+ if (server->flags & NFS_MOUNT_TAGXID)
+ sb->s_flags |= MS_TAGXID;
+
+ sb->s_maxbytes = fsinfo.maxfilesize;
+ if (sb->s_maxbytes > MAX_LFS_FILESIZE)
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+
+ server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
+ server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
+ server->client->cl_tagxid = (server->flags & NFS_MOUNT_TAGXID) ? 1 : 0;
+
+ /* We're airborne Set socket buffersize */
+ rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
+ return 0;
+ /* Yargs. It didn't work out. */
+out_no_root:
+ dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
+ if (!IS_ERR(root_inode))
+ iput(root_inode);
+ return no_root_error;
+}
+
+static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
+{
+ to->to_initval = timeo * HZ / 10;
+ to->to_retries = retrans;
+ if (!to->to_retries)
+ to->to_retries = 2;
+
+ switch (proto) {
+ case IPPROTO_TCP:
+ if (!to->to_initval)
+ to->to_initval = 60 * HZ;
+ if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
+ to->to_initval = NFS_MAX_TCP_TIMEOUT;
+ to->to_increment = to->to_initval;
+ to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
+ to->to_exponential = 0;
+ break;
+ case IPPROTO_UDP:
+ default:
+ if (!to->to_initval)
+ to->to_initval = 11 * HZ / 10;
+ if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
+ to->to_initval = NFS_MAX_UDP_TIMEOUT;
+ to->to_maxval = NFS_MAX_UDP_TIMEOUT;
+ to->to_exponential = 1;
+ break;
+ }
+}
+
+/*
+ * Create an RPC client handle.
+ */
+static struct rpc_clnt *
+nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
+{
+ struct rpc_timeout timeparms;
+ struct rpc_xprt *xprt = NULL;
+ struct rpc_clnt *clnt = NULL;
+ int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
+
+ nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
+
+ /* create transport and client */
+ xprt = xprt_create_proto(proto, &server->addr, &timeparms);
+ if (IS_ERR(xprt)) {
+ dprintk("%s: cannot create RPC transport. Error = %ld\n",
+ __FUNCTION__, PTR_ERR(xprt));
+ return (struct rpc_clnt *)xprt;
+ }
+ clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
+ server->rpc_ops->version, data->pseudoflavor);
+ if (IS_ERR(clnt)) {
+ dprintk("%s: cannot create RPC client. Error = %ld\n",
+ __FUNCTION__, PTR_ERR(xprt));
+ goto out_fail;
+ }
+
+ clnt->cl_intr = 1;
+ clnt->cl_softrtry = 1;
+ clnt->cl_tagxid = 1;
+
+ return clnt;
+
+out_fail:
+ return clnt;
+}
+
+/*
+ * The way this works is that the mount process passes a structure
+ * in the data argument which contains the server's IP address
+ * and the root file handle obtained from the server's mount
+ * daemon. We stash these away in the private superblock fields.
+ */
+static int
+nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
+{
+ struct nfs_server *server;
+ rpc_authflavor_t authflavor;
+
+ server = NFS_SB(sb);
+ sb->s_blocksize_bits = 0;
+ sb->s_blocksize = 0;
+ if (data->bsize)
+ sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
+ if (data->rsize)
+ server->rsize = nfs_block_size(data->rsize, NULL);
+ if (data->wsize)
+ server->wsize = nfs_block_size(data->wsize, NULL);
+ server->flags = data->flags & NFS_MOUNT_FLAGMASK;
+
+ server->acregmin = data->acregmin*HZ;
+ server->acregmax = data->acregmax*HZ;
+ server->acdirmin = data->acdirmin*HZ;
+ server->acdirmax = data->acdirmax*HZ;
+
+ /* Start lockd here, before we might error out */
+ if (!(server->flags & NFS_MOUNT_NONLM))
+ lockd_up();
+
+ server->namelen = data->namlen;
+ server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
+ if (!server->hostname)
+ return -ENOMEM;
+ strcpy(server->hostname, data->hostname);
+
+ /* Check NFS protocol revision and initialize RPC op vector
+ * and file handle pool. */
+#ifdef CONFIG_NFS_V3
+ if (server->flags & NFS_MOUNT_VER3) {
+ server->rpc_ops = &nfs_v3_clientops;
+ server->caps |= NFS_CAP_READDIRPLUS;
+ } else {
+ server->rpc_ops = &nfs_v2_clientops;
+ }
+#else
+ server->rpc_ops = &nfs_v2_clientops;
+#endif
+
+ /* Fill in pseudoflavor for mount version < 5 */
+ if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
+ data->pseudoflavor = RPC_AUTH_UNIX;
+ authflavor = data->pseudoflavor; /* save for sb_init() */
+ /* XXX maybe we want to add a server->pseudoflavor field */
+
+ /* Create RPC client handles */
+ server->client = nfs_create_client(server, data);
+ if (IS_ERR(server->client))
+ return PTR_ERR(server->client);
+ /* RFC 2623, sec 2.3.2 */
+ if (authflavor != RPC_AUTH_UNIX) {
+ struct rpc_auth *auth;
+
+ server->client_sys = rpc_clone_client(server->client);
+ if (IS_ERR(server->client_sys))
+ return PTR_ERR(server->client_sys);
+ auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
+ if (IS_ERR(auth))
+ return PTR_ERR(auth);
+ } else {
+ 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 */
+ /*
+ * The VFS shouldn't apply the umask to mode bits. We will
+ * do so ourselves when necessary.
+ */
+ sb->s_flags |= MS_POSIXACL;
+ if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
+ server->namelen = NFS3_MAXNAMLEN;
+ sb->s_time_gran = 1;
+ } else {
+ if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
+ server->namelen = NFS2_MAXNAMLEN;
+ }
+
+ sb->s_op = &nfs_sops;
+ return nfs_sb_init(sb, authflavor);
+}
+
+static int
+nfs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ struct nfs_server *server = NFS_SB(sb);
+ unsigned char blockbits;
+ unsigned long blockres;
+ struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
+ struct nfs_fattr fattr;
+ struct nfs_fsstat res = {
+ .fattr = &fattr,
+ };
+ int error;
+
+ lock_kernel();
+
+ error = server->rpc_ops->statfs(server, rootfh, &res);
+ buf->f_type = NFS_SUPER_MAGIC;
+ if (error < 0)
+ goto out_err;
+
+ /*
+ * Current versions of glibc do not correctly handle the
+ * case where f_frsize != f_bsize. Eventually we want to
+ * report the value of wtmult in this field.
+ */
+ buf->f_frsize = sb->s_blocksize;
+
+ /*
+ * On most *nix systems, f_blocks, f_bfree, and f_bavail
+ * are reported in units of f_frsize. Linux hasn't had
+ * an f_frsize field in its statfs struct until recently,
+ * thus historically Linux's sys_statfs reports these
+ * fields in units of f_bsize.
+ */
+ buf->f_bsize = sb->s_blocksize;
+ blockbits = sb->s_blocksize_bits;
+ blockres = (1 << blockbits) - 1;
+ buf->f_blocks = (res.tbytes + blockres) >> blockbits;
+ buf->f_bfree = (res.fbytes + blockres) >> blockbits;
+ buf->f_bavail = (res.abytes + blockres) >> blockbits;
+
+ buf->f_files = res.tfiles;
+ buf->f_ffree = res.afiles;
+
+ buf->f_namelen = server->namelen;
+ out:
+ unlock_kernel();
+ return 0;
+
+ out_err:
+ dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
+ buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
+ goto out;
+
+}
+
+static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+ static struct proc_nfs_info {
+ int flag;
+ char *str;
+ char *nostr;
+ } nfs_info[] = {
+ { NFS_MOUNT_SOFT, ",soft", ",hard" },
+ { NFS_MOUNT_INTR, ",intr", "" },
+ { NFS_MOUNT_POSIX, ",posix", "" },
+ { NFS_MOUNT_NOCTO, ",nocto", "" },
+ { NFS_MOUNT_NOAC, ",noac", "" },
+ { NFS_MOUNT_NONLM, ",nolock", ",lock" },
+ { NFS_MOUNT_NOACL, ",noacl", "" },
+ { NFS_MOUNT_TAGXID, ",tagxid", "" },
+ { 0, NULL, NULL }
+ };
+ struct proc_nfs_info *nfs_infop;
+ struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
+ char buf[12];
+ char *proto;
+
+ seq_printf(m, ",v%d", nfss->rpc_ops->version);
+ seq_printf(m, ",rsize=%d", nfss->rsize);
+ seq_printf(m, ",wsize=%d", nfss->wsize);
+ if (nfss->acregmin != 3*HZ)
+ seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
+ if (nfss->acregmax != 60*HZ)
+ seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
+ if (nfss->acdirmin != 30*HZ)
+ seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
+ if (nfss->acdirmax != 60*HZ)
+ seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
+ for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
+ if (nfss->flags & nfs_infop->flag)
+ seq_puts(m, nfs_infop->str);
+ else
+ seq_puts(m, nfs_infop->nostr);
+ }
+ switch (nfss->client->cl_xprt->prot) {
+ case IPPROTO_TCP:
+ proto = "tcp";
+ break;
+ case IPPROTO_UDP:
+ proto = "udp";
+ break;
+ default:
+ snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
+ proto = buf;
+ }
+ seq_printf(m, ",proto=%s", proto);
+ seq_puts(m, ",addr=");
+ seq_escape(m, nfss->hostname, " \t\n\\");
+ return 0;
+}
+