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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * linux/fs/nfs/fs_context.c
- *
- * Copyright (C) 1992 Rick Sladkey
- * Conversion to new mount api Copyright (C) David Howells
- *
- * NFS mount handling.
- *
- * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
- */
- #include <linux/module.h>
- #include <linux/fs.h>
- #include <linux/fs_context.h>
- #include <linux/fs_parser.h>
- #include <linux/nfs_fs.h>
- #include <linux/nfs_mount.h>
- #include <linux/nfs4_mount.h>
- #include "nfs.h"
- #include "internal.h"
- #define NFSDBG_FACILITY NFSDBG_MOUNT
- #if IS_ENABLED(CONFIG_NFS_V3)
- #define NFS_DEFAULT_VERSION 3
- #else
- #define NFS_DEFAULT_VERSION 2
- #endif
- #define NFS_MAX_CONNECTIONS 16
- enum nfs_param {
- Opt_ac,
- Opt_acdirmax,
- Opt_acdirmin,
- Opt_acl,
- Opt_acregmax,
- Opt_acregmin,
- Opt_actimeo,
- Opt_addr,
- Opt_bg,
- Opt_bsize,
- Opt_clientaddr,
- Opt_cto,
- Opt_fg,
- Opt_fscache,
- Opt_fscache_flag,
- Opt_hard,
- Opt_intr,
- Opt_local_lock,
- Opt_lock,
- Opt_lookupcache,
- Opt_migration,
- Opt_minorversion,
- Opt_mountaddr,
- Opt_mounthost,
- Opt_mountport,
- Opt_mountproto,
- Opt_mountvers,
- Opt_namelen,
- Opt_nconnect,
- Opt_port,
- Opt_posix,
- Opt_proto,
- Opt_rdirplus,
- Opt_rdma,
- Opt_resvport,
- Opt_retrans,
- Opt_retry,
- Opt_rsize,
- Opt_sec,
- Opt_sharecache,
- Opt_sloppy,
- Opt_soft,
- Opt_softerr,
- Opt_softreval,
- Opt_source,
- Opt_tcp,
- Opt_timeo,
- Opt_udp,
- Opt_v,
- Opt_vers,
- Opt_wsize,
- };
- enum {
- Opt_local_lock_all,
- Opt_local_lock_flock,
- Opt_local_lock_none,
- Opt_local_lock_posix,
- };
- static const struct constant_table nfs_param_enums_local_lock[] = {
- { "all", Opt_local_lock_all },
- { "flock", Opt_local_lock_flock },
- { "posix", Opt_local_lock_posix },
- { "none", Opt_local_lock_none },
- {}
- };
- enum {
- Opt_lookupcache_all,
- Opt_lookupcache_none,
- Opt_lookupcache_positive,
- };
- static const struct constant_table nfs_param_enums_lookupcache[] = {
- { "all", Opt_lookupcache_all },
- { "none", Opt_lookupcache_none },
- { "pos", Opt_lookupcache_positive },
- { "positive", Opt_lookupcache_positive },
- {}
- };
- static const struct fs_parameter_spec nfs_fs_parameters[] = {
- fsparam_flag_no("ac", Opt_ac),
- fsparam_u32 ("acdirmax", Opt_acdirmax),
- fsparam_u32 ("acdirmin", Opt_acdirmin),
- fsparam_flag_no("acl", Opt_acl),
- fsparam_u32 ("acregmax", Opt_acregmax),
- fsparam_u32 ("acregmin", Opt_acregmin),
- fsparam_u32 ("actimeo", Opt_actimeo),
- fsparam_string("addr", Opt_addr),
- fsparam_flag ("bg", Opt_bg),
- fsparam_u32 ("bsize", Opt_bsize),
- fsparam_string("clientaddr", Opt_clientaddr),
- fsparam_flag_no("cto", Opt_cto),
- fsparam_flag ("fg", Opt_fg),
- fsparam_flag_no("fsc", Opt_fscache_flag),
- fsparam_string("fsc", Opt_fscache),
- fsparam_flag ("hard", Opt_hard),
- __fsparam(NULL, "intr", Opt_intr,
- fs_param_neg_with_no|fs_param_deprecated, NULL),
- fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
- fsparam_flag_no("lock", Opt_lock),
- fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
- fsparam_flag_no("migration", Opt_migration),
- fsparam_u32 ("minorversion", Opt_minorversion),
- fsparam_string("mountaddr", Opt_mountaddr),
- fsparam_string("mounthost", Opt_mounthost),
- fsparam_u32 ("mountport", Opt_mountport),
- fsparam_string("mountproto", Opt_mountproto),
- fsparam_u32 ("mountvers", Opt_mountvers),
- fsparam_u32 ("namlen", Opt_namelen),
- fsparam_u32 ("nconnect", Opt_nconnect),
- fsparam_string("nfsvers", Opt_vers),
- fsparam_u32 ("port", Opt_port),
- fsparam_flag_no("posix", Opt_posix),
- fsparam_string("proto", Opt_proto),
- fsparam_flag_no("rdirplus", Opt_rdirplus),
- fsparam_flag ("rdma", Opt_rdma),
- fsparam_flag_no("resvport", Opt_resvport),
- fsparam_u32 ("retrans", Opt_retrans),
- fsparam_string("retry", Opt_retry),
- fsparam_u32 ("rsize", Opt_rsize),
- fsparam_string("sec", Opt_sec),
- fsparam_flag_no("sharecache", Opt_sharecache),
- fsparam_flag ("sloppy", Opt_sloppy),
- fsparam_flag ("soft", Opt_soft),
- fsparam_flag ("softerr", Opt_softerr),
- fsparam_flag ("softreval", Opt_softreval),
- fsparam_string("source", Opt_source),
- fsparam_flag ("tcp", Opt_tcp),
- fsparam_u32 ("timeo", Opt_timeo),
- fsparam_flag ("udp", Opt_udp),
- fsparam_flag ("v2", Opt_v),
- fsparam_flag ("v3", Opt_v),
- fsparam_flag ("v4", Opt_v),
- fsparam_flag ("v4.0", Opt_v),
- fsparam_flag ("v4.1", Opt_v),
- fsparam_flag ("v4.2", Opt_v),
- fsparam_string("vers", Opt_vers),
- fsparam_u32 ("wsize", Opt_wsize),
- {}
- };
- enum {
- Opt_vers_2,
- Opt_vers_3,
- Opt_vers_4,
- Opt_vers_4_0,
- Opt_vers_4_1,
- Opt_vers_4_2,
- };
- static const struct constant_table nfs_vers_tokens[] = {
- { "2", Opt_vers_2 },
- { "3", Opt_vers_3 },
- { "4", Opt_vers_4 },
- { "4.0", Opt_vers_4_0 },
- { "4.1", Opt_vers_4_1 },
- { "4.2", Opt_vers_4_2 },
- {}
- };
- enum {
- Opt_xprt_rdma,
- Opt_xprt_rdma6,
- Opt_xprt_tcp,
- Opt_xprt_tcp6,
- Opt_xprt_udp,
- Opt_xprt_udp6,
- nr__Opt_xprt
- };
- static const struct constant_table nfs_xprt_protocol_tokens[] = {
- { "rdma", Opt_xprt_rdma },
- { "rdma6", Opt_xprt_rdma6 },
- { "tcp", Opt_xprt_tcp },
- { "tcp6", Opt_xprt_tcp6 },
- { "udp", Opt_xprt_udp },
- { "udp6", Opt_xprt_udp6 },
- {}
- };
- enum {
- Opt_sec_krb5,
- Opt_sec_krb5i,
- Opt_sec_krb5p,
- Opt_sec_lkey,
- Opt_sec_lkeyi,
- Opt_sec_lkeyp,
- Opt_sec_none,
- Opt_sec_spkm,
- Opt_sec_spkmi,
- Opt_sec_spkmp,
- Opt_sec_sys,
- nr__Opt_sec
- };
- static const struct constant_table nfs_secflavor_tokens[] = {
- { "krb5", Opt_sec_krb5 },
- { "krb5i", Opt_sec_krb5i },
- { "krb5p", Opt_sec_krb5p },
- { "lkey", Opt_sec_lkey },
- { "lkeyi", Opt_sec_lkeyi },
- { "lkeyp", Opt_sec_lkeyp },
- { "none", Opt_sec_none },
- { "null", Opt_sec_none },
- { "spkm3", Opt_sec_spkm },
- { "spkm3i", Opt_sec_spkmi },
- { "spkm3p", Opt_sec_spkmp },
- { "sys", Opt_sec_sys },
- {}
- };
- /*
- * Sanity-check a server address provided by the mount command.
- *
- * Address family must be initialized, and address must not be
- * the ANY address for that family.
- */
- static int nfs_verify_server_address(struct sockaddr *addr)
- {
- switch (addr->sa_family) {
- case AF_INET: {
- struct sockaddr_in *sa = (struct sockaddr_in *)addr;
- return sa->sin_addr.s_addr != htonl(INADDR_ANY);
- }
- case AF_INET6: {
- struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
- return !ipv6_addr_any(sa);
- }
- }
- dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
- return 0;
- }
- /*
- * Sanity check the NFS transport protocol.
- *
- */
- static void nfs_validate_transport_protocol(struct nfs_fs_context *ctx)
- {
- switch (ctx->nfs_server.protocol) {
- case XPRT_TRANSPORT_UDP:
- case XPRT_TRANSPORT_TCP:
- case XPRT_TRANSPORT_RDMA:
- break;
- default:
- ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- }
- }
- /*
- * For text based NFSv2/v3 mounts, the mount protocol transport default
- * settings should depend upon the specified NFS transport.
- */
- static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
- {
- nfs_validate_transport_protocol(ctx);
- if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
- ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
- return;
- switch (ctx->nfs_server.protocol) {
- case XPRT_TRANSPORT_UDP:
- ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case XPRT_TRANSPORT_TCP:
- case XPRT_TRANSPORT_RDMA:
- ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
- }
- }
- /*
- * Add 'flavor' to 'auth_info' if not already present.
- * Returns true if 'flavor' ends up in the list, false otherwise
- */
- static int nfs_auth_info_add(struct fs_context *fc,
- struct nfs_auth_info *auth_info,
- rpc_authflavor_t flavor)
- {
- unsigned int i;
- unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
- /* make sure this flavor isn't already in the list */
- for (i = 0; i < auth_info->flavor_len; i++) {
- if (flavor == auth_info->flavors[i])
- return 0;
- }
- if (auth_info->flavor_len + 1 >= max_flavor_len)
- return nfs_invalf(fc, "NFS: too many sec= flavors");
- auth_info->flavors[auth_info->flavor_len++] = flavor;
- return 0;
- }
- /*
- * Parse the value of the 'sec=' option.
- */
- static int nfs_parse_security_flavors(struct fs_context *fc,
- struct fs_parameter *param)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- rpc_authflavor_t pseudoflavor;
- char *string = param->string, *p;
- int ret;
- dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
- while ((p = strsep(&string, ":")) != NULL) {
- if (!*p)
- continue;
- switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
- case Opt_sec_none:
- pseudoflavor = RPC_AUTH_NULL;
- break;
- case Opt_sec_sys:
- pseudoflavor = RPC_AUTH_UNIX;
- break;
- case Opt_sec_krb5:
- pseudoflavor = RPC_AUTH_GSS_KRB5;
- break;
- case Opt_sec_krb5i:
- pseudoflavor = RPC_AUTH_GSS_KRB5I;
- break;
- case Opt_sec_krb5p:
- pseudoflavor = RPC_AUTH_GSS_KRB5P;
- break;
- case Opt_sec_lkey:
- pseudoflavor = RPC_AUTH_GSS_LKEY;
- break;
- case Opt_sec_lkeyi:
- pseudoflavor = RPC_AUTH_GSS_LKEYI;
- break;
- case Opt_sec_lkeyp:
- pseudoflavor = RPC_AUTH_GSS_LKEYP;
- break;
- case Opt_sec_spkm:
- pseudoflavor = RPC_AUTH_GSS_SPKM;
- break;
- case Opt_sec_spkmi:
- pseudoflavor = RPC_AUTH_GSS_SPKMI;
- break;
- case Opt_sec_spkmp:
- pseudoflavor = RPC_AUTH_GSS_SPKMP;
- break;
- default:
- return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
- }
- ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- static int nfs_parse_version_string(struct fs_context *fc,
- const char *string)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- ctx->flags &= ~NFS_MOUNT_VER3;
- switch (lookup_constant(nfs_vers_tokens, string, -1)) {
- case Opt_vers_2:
- ctx->version = 2;
- break;
- case Opt_vers_3:
- ctx->flags |= NFS_MOUNT_VER3;
- ctx->version = 3;
- break;
- case Opt_vers_4:
- /* Backward compatibility option. In future,
- * the mount program should always supply
- * a NFSv4 minor version number.
- */
- ctx->version = 4;
- break;
- case Opt_vers_4_0:
- ctx->version = 4;
- ctx->minorversion = 0;
- break;
- case Opt_vers_4_1:
- ctx->version = 4;
- ctx->minorversion = 1;
- break;
- case Opt_vers_4_2:
- ctx->version = 4;
- ctx->minorversion = 2;
- break;
- default:
- return nfs_invalf(fc, "NFS: Unsupported NFS version");
- }
- return 0;
- }
- /*
- * Parse a single mount parameter.
- */
- static int nfs_fs_context_parse_param(struct fs_context *fc,
- struct fs_parameter *param)
- {
- struct fs_parse_result result;
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- unsigned short protofamily, mountfamily;
- unsigned int len;
- int ret, opt;
- dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
- opt = fs_parse(fc, nfs_fs_parameters, param, &result);
- if (opt < 0)
- return ctx->sloppy ? 1 : opt;
- switch (opt) {
- case Opt_source:
- if (fc->source)
- return nfs_invalf(fc, "NFS: Multiple sources not supported");
- fc->source = param->string;
- param->string = NULL;
- break;
- /*
- * boolean options: foo/nofoo
- */
- case Opt_soft:
- ctx->flags |= NFS_MOUNT_SOFT;
- ctx->flags &= ~NFS_MOUNT_SOFTERR;
- break;
- case Opt_softerr:
- ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
- ctx->flags &= ~NFS_MOUNT_SOFT;
- break;
- case Opt_hard:
- ctx->flags &= ~(NFS_MOUNT_SOFT |
- NFS_MOUNT_SOFTERR |
- NFS_MOUNT_SOFTREVAL);
- break;
- case Opt_softreval:
- if (result.negated)
- ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
- else
- ctx->flags &= NFS_MOUNT_SOFTREVAL;
- break;
- case Opt_posix:
- if (result.negated)
- ctx->flags &= ~NFS_MOUNT_POSIX;
- else
- ctx->flags |= NFS_MOUNT_POSIX;
- break;
- case Opt_cto:
- if (result.negated)
- ctx->flags |= NFS_MOUNT_NOCTO;
- else
- ctx->flags &= ~NFS_MOUNT_NOCTO;
- break;
- case Opt_ac:
- if (result.negated)
- ctx->flags |= NFS_MOUNT_NOAC;
- else
- ctx->flags &= ~NFS_MOUNT_NOAC;
- break;
- case Opt_lock:
- if (result.negated) {
- ctx->flags |= NFS_MOUNT_NONLM;
- ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
- } else {
- ctx->flags &= ~NFS_MOUNT_NONLM;
- ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
- }
- break;
- case Opt_udp:
- ctx->flags &= ~NFS_MOUNT_TCP;
- ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case Opt_tcp:
- ctx->flags |= NFS_MOUNT_TCP;
- ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- break;
- case Opt_rdma:
- ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
- ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
- xprt_load_transport(param->key);
- break;
- case Opt_acl:
- if (result.negated)
- ctx->flags |= NFS_MOUNT_NOACL;
- else
- ctx->flags &= ~NFS_MOUNT_NOACL;
- break;
- case Opt_rdirplus:
- if (result.negated)
- ctx->flags |= NFS_MOUNT_NORDIRPLUS;
- else
- ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
- break;
- case Opt_sharecache:
- if (result.negated)
- ctx->flags |= NFS_MOUNT_UNSHARED;
- else
- ctx->flags &= ~NFS_MOUNT_UNSHARED;
- break;
- case Opt_resvport:
- if (result.negated)
- ctx->flags |= NFS_MOUNT_NORESVPORT;
- else
- ctx->flags &= ~NFS_MOUNT_NORESVPORT;
- break;
- case Opt_fscache_flag:
- if (result.negated)
- ctx->options &= ~NFS_OPTION_FSCACHE;
- else
- ctx->options |= NFS_OPTION_FSCACHE;
- kfree(ctx->fscache_uniq);
- ctx->fscache_uniq = NULL;
- break;
- case Opt_fscache:
- ctx->options |= NFS_OPTION_FSCACHE;
- kfree(ctx->fscache_uniq);
- ctx->fscache_uniq = param->string;
- param->string = NULL;
- break;
- case Opt_migration:
- if (result.negated)
- ctx->options &= ~NFS_OPTION_MIGRATION;
- else
- ctx->options |= NFS_OPTION_MIGRATION;
- break;
- /*
- * options that take numeric values
- */
- case Opt_port:
- if (result.uint_32 > USHRT_MAX)
- goto out_of_bounds;
- ctx->nfs_server.port = result.uint_32;
- break;
- case Opt_rsize:
- ctx->rsize = result.uint_32;
- break;
- case Opt_wsize:
- ctx->wsize = result.uint_32;
- break;
- case Opt_bsize:
- ctx->bsize = result.uint_32;
- break;
- case Opt_timeo:
- if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
- goto out_of_bounds;
- ctx->timeo = result.uint_32;
- break;
- case Opt_retrans:
- if (result.uint_32 > INT_MAX)
- goto out_of_bounds;
- ctx->retrans = result.uint_32;
- break;
- case Opt_acregmin:
- ctx->acregmin = result.uint_32;
- break;
- case Opt_acregmax:
- ctx->acregmax = result.uint_32;
- break;
- case Opt_acdirmin:
- ctx->acdirmin = result.uint_32;
- break;
- case Opt_acdirmax:
- ctx->acdirmax = result.uint_32;
- break;
- case Opt_actimeo:
- ctx->acregmin = result.uint_32;
- ctx->acregmax = result.uint_32;
- ctx->acdirmin = result.uint_32;
- ctx->acdirmax = result.uint_32;
- break;
- case Opt_namelen:
- ctx->namlen = result.uint_32;
- break;
- case Opt_mountport:
- if (result.uint_32 > USHRT_MAX)
- goto out_of_bounds;
- ctx->mount_server.port = result.uint_32;
- break;
- case Opt_mountvers:
- if (result.uint_32 < NFS_MNT_VERSION ||
- result.uint_32 > NFS_MNT3_VERSION)
- goto out_of_bounds;
- ctx->mount_server.version = result.uint_32;
- break;
- case Opt_minorversion:
- if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
- goto out_of_bounds;
- ctx->minorversion = result.uint_32;
- break;
- /*
- * options that take text values
- */
- case Opt_v:
- ret = nfs_parse_version_string(fc, param->key + 1);
- if (ret < 0)
- return ret;
- break;
- case Opt_vers:
- ret = nfs_parse_version_string(fc, param->string);
- if (ret < 0)
- return ret;
- break;
- case Opt_sec:
- ret = nfs_parse_security_flavors(fc, param);
- if (ret < 0)
- return ret;
- break;
- case Opt_proto:
- protofamily = AF_INET;
- switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
- case Opt_xprt_udp6:
- protofamily = AF_INET6;
- fallthrough;
- case Opt_xprt_udp:
- ctx->flags &= ~NFS_MOUNT_TCP;
- ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case Opt_xprt_tcp6:
- protofamily = AF_INET6;
- fallthrough;
- case Opt_xprt_tcp:
- ctx->flags |= NFS_MOUNT_TCP;
- ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- break;
- case Opt_xprt_rdma6:
- protofamily = AF_INET6;
- fallthrough;
- case Opt_xprt_rdma:
- /* vector side protocols to TCP */
- ctx->flags |= NFS_MOUNT_TCP;
- ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
- xprt_load_transport(param->string);
- break;
- default:
- return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
- }
- ctx->protofamily = protofamily;
- break;
- case Opt_mountproto:
- mountfamily = AF_INET;
- switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
- case Opt_xprt_udp6:
- mountfamily = AF_INET6;
- fallthrough;
- case Opt_xprt_udp:
- ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case Opt_xprt_tcp6:
- mountfamily = AF_INET6;
- fallthrough;
- case Opt_xprt_tcp:
- ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
- break;
- case Opt_xprt_rdma: /* not used for side protocols */
- default:
- return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
- }
- ctx->mountfamily = mountfamily;
- break;
- case Opt_addr:
- len = rpc_pton(fc->net_ns, param->string, param->size,
- &ctx->nfs_server.address,
- sizeof(ctx->nfs_server._address));
- if (len == 0)
- goto out_invalid_address;
- ctx->nfs_server.addrlen = len;
- break;
- case Opt_clientaddr:
- kfree(ctx->client_address);
- ctx->client_address = param->string;
- param->string = NULL;
- break;
- case Opt_mounthost:
- kfree(ctx->mount_server.hostname);
- ctx->mount_server.hostname = param->string;
- param->string = NULL;
- break;
- case Opt_mountaddr:
- len = rpc_pton(fc->net_ns, param->string, param->size,
- &ctx->mount_server.address,
- sizeof(ctx->mount_server._address));
- if (len == 0)
- goto out_invalid_address;
- ctx->mount_server.addrlen = len;
- break;
- case Opt_nconnect:
- if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
- goto out_of_bounds;
- ctx->nfs_server.nconnect = result.uint_32;
- break;
- case Opt_lookupcache:
- switch (result.uint_32) {
- case Opt_lookupcache_all:
- ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
- break;
- case Opt_lookupcache_positive:
- ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
- ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
- break;
- case Opt_lookupcache_none:
- ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
- break;
- default:
- goto out_invalid_value;
- }
- break;
- case Opt_local_lock:
- switch (result.uint_32) {
- case Opt_local_lock_all:
- ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
- NFS_MOUNT_LOCAL_FCNTL);
- break;
- case Opt_local_lock_flock:
- ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
- break;
- case Opt_local_lock_posix:
- ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
- break;
- case Opt_local_lock_none:
- ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
- NFS_MOUNT_LOCAL_FCNTL);
- break;
- default:
- goto out_invalid_value;
- }
- break;
- /*
- * Special options
- */
- case Opt_sloppy:
- ctx->sloppy = true;
- dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
- break;
- }
- return 0;
- out_invalid_value:
- return nfs_invalf(fc, "NFS: Bad mount option value specified");
- out_invalid_address:
- return nfs_invalf(fc, "NFS: Bad IP address specified");
- out_of_bounds:
- return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
- }
- /*
- * Split fc->source into "hostname:export_path".
- *
- * The leftmost colon demarks the split between the server's hostname
- * and the export path. If the hostname starts with a left square
- * bracket, then it may contain colons.
- *
- * Note: caller frees hostname and export path, even on error.
- */
- static int nfs_parse_source(struct fs_context *fc,
- size_t maxnamlen, size_t maxpathlen)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- const char *dev_name = fc->source;
- size_t len;
- const char *end;
- if (unlikely(!dev_name || !*dev_name)) {
- dfprintk(MOUNT, "NFS: device name not specified\n");
- return -EINVAL;
- }
- /* Is the host name protected with square brakcets? */
- if (*dev_name == '[') {
- end = strchr(++dev_name, ']');
- if (end == NULL || end[1] != ':')
- goto out_bad_devname;
- len = end - dev_name;
- end++;
- } else {
- const char *comma;
- end = strchr(dev_name, ':');
- if (end == NULL)
- goto out_bad_devname;
- len = end - dev_name;
- /* kill possible hostname list: not supported */
- comma = memchr(dev_name, ',', len);
- if (comma)
- len = comma - dev_name;
- }
- if (len > maxnamlen)
- goto out_hostname;
- kfree(ctx->nfs_server.hostname);
- /* N.B. caller will free nfs_server.hostname in all cases */
- ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
- if (!ctx->nfs_server.hostname)
- goto out_nomem;
- len = strlen(++end);
- if (len > maxpathlen)
- goto out_path;
- ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
- if (!ctx->nfs_server.export_path)
- goto out_nomem;
- dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
- return 0;
- out_bad_devname:
- return nfs_invalf(fc, "NFS: device name not in host:path format");
- out_nomem:
- nfs_errorf(fc, "NFS: not enough memory to parse device name");
- return -ENOMEM;
- out_hostname:
- nfs_errorf(fc, "NFS: server hostname too long");
- return -ENAMETOOLONG;
- out_path:
- nfs_errorf(fc, "NFS: export pathname too long");
- return -ENAMETOOLONG;
- }
- static inline bool is_remount_fc(struct fs_context *fc)
- {
- return fc->root != NULL;
- }
- /*
- * Parse monolithic NFS2/NFS3 mount data
- * - fills in the mount root filehandle
- *
- * For option strings, user space handles the following behaviors:
- *
- * + DNS: mapping server host name to IP address ("addr=" option)
- *
- * + failure mode: how to behave if a mount request can't be handled
- * immediately ("fg/bg" option)
- *
- * + retry: how often to retry a mount request ("retry=" option)
- *
- * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
- * mountproto=tcp after mountproto=udp, and so on
- */
- static int nfs23_parse_monolithic(struct fs_context *fc,
- struct nfs_mount_data *data)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- struct nfs_fh *mntfh = ctx->mntfh;
- struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
- int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
- if (data == NULL)
- goto out_no_data;
- ctx->version = NFS_DEFAULT_VERSION;
- switch (data->version) {
- case 1:
- data->namlen = 0;
- fallthrough;
- case 2:
- data->bsize = 0;
- fallthrough;
- case 3:
- if (data->flags & NFS_MOUNT_VER3)
- goto out_no_v3;
- data->root.size = NFS2_FHSIZE;
- memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
- /* Turn off security negotiation */
- extra_flags |= NFS_MOUNT_SECFLAVOUR;
- fallthrough;
- case 4:
- if (data->flags & NFS_MOUNT_SECFLAVOUR)
- goto out_no_sec;
- fallthrough;
- case 5:
- memset(data->context, 0, sizeof(data->context));
- fallthrough;
- case 6:
- if (data->flags & NFS_MOUNT_VER3) {
- if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
- goto out_invalid_fh;
- mntfh->size = data->root.size;
- ctx->version = 3;
- } else {
- mntfh->size = NFS2_FHSIZE;
- ctx->version = 2;
- }
- memcpy(mntfh->data, data->root.data, mntfh->size);
- if (mntfh->size < sizeof(mntfh->data))
- memset(mntfh->data + mntfh->size, 0,
- sizeof(mntfh->data) - mntfh->size);
- /*
- * for proto == XPRT_TRANSPORT_UDP, which is what uses
- * to_exponential, implying shift: limit the shift value
- * to BITS_PER_LONG (majortimeo is unsigned long)
- */
- if (!(data->flags & NFS_MOUNT_TCP)) /* this will be UDP */
- if (data->retrans >= 64) /* shift value is too large */
- goto out_invalid_data;
- /*
- * Translate to nfs_fs_context, which nfs_fill_super
- * can deal with.
- */
- ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
- ctx->flags |= extra_flags;
- ctx->rsize = data->rsize;
- ctx->wsize = data->wsize;
- ctx->timeo = data->timeo;
- ctx->retrans = data->retrans;
- ctx->acregmin = data->acregmin;
- ctx->acregmax = data->acregmax;
- ctx->acdirmin = data->acdirmin;
- ctx->acdirmax = data->acdirmax;
- ctx->need_mount = false;
- memcpy(sap, &data->addr, sizeof(data->addr));
- ctx->nfs_server.addrlen = sizeof(data->addr);
- ctx->nfs_server.port = ntohs(data->addr.sin_port);
- if (sap->sa_family != AF_INET ||
- !nfs_verify_server_address(sap))
- goto out_no_address;
- if (!(data->flags & NFS_MOUNT_TCP))
- ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- /* N.B. caller will free nfs_server.hostname in all cases */
- ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
- if (!ctx->nfs_server.hostname)
- goto out_nomem;
- ctx->namlen = data->namlen;
- ctx->bsize = data->bsize;
- if (data->flags & NFS_MOUNT_SECFLAVOUR)
- ctx->selected_flavor = data->pseudoflavor;
- else
- ctx->selected_flavor = RPC_AUTH_UNIX;
- if (!(data->flags & NFS_MOUNT_NONLM))
- ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
- NFS_MOUNT_LOCAL_FCNTL);
- else
- ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
- NFS_MOUNT_LOCAL_FCNTL);
- /*
- * The legacy version 6 binary mount data from userspace has a
- * field used only to transport selinux information into the
- * kernel. To continue to support that functionality we
- * have a touch of selinux knowledge here in the NFS code. The
- * userspace code converted context=blah to just blah so we are
- * converting back to the full string selinux understands.
- */
- if (data->context[0]){
- #ifdef CONFIG_SECURITY_SELINUX
- int ret;
- data->context[NFS_MAX_CONTEXT_LEN] = '\0';
- ret = vfs_parse_fs_string(fc, "context",
- data->context, strlen(data->context));
- if (ret < 0)
- return ret;
- #else
- return -EINVAL;
- #endif
- }
- break;
- default:
- goto generic;
- }
- ctx->skip_reconfig_option_check = true;
- return 0;
- generic:
- return generic_parse_monolithic(fc, data);
- out_no_data:
- if (is_remount_fc(fc)) {
- ctx->skip_reconfig_option_check = true;
- return 0;
- }
- return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
- out_no_v3:
- return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
- out_no_sec:
- return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
- out_nomem:
- dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
- return -ENOMEM;
- out_no_address:
- return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
- out_invalid_fh:
- return nfs_invalf(fc, "NFS: invalid root filehandle");
- out_invalid_data:
- return nfs_invalf(fc, "NFS: invalid binary mount data");
- }
- #if IS_ENABLED(CONFIG_NFS_V4)
- struct compat_nfs_string {
- compat_uint_t len;
- compat_uptr_t data;
- };
- static inline void compat_nfs_string(struct nfs_string *dst,
- struct compat_nfs_string *src)
- {
- dst->data = compat_ptr(src->data);
- dst->len = src->len;
- }
- struct compat_nfs4_mount_data_v1 {
- compat_int_t version;
- compat_int_t flags;
- compat_int_t rsize;
- compat_int_t wsize;
- compat_int_t timeo;
- compat_int_t retrans;
- compat_int_t acregmin;
- compat_int_t acregmax;
- compat_int_t acdirmin;
- compat_int_t acdirmax;
- struct compat_nfs_string client_addr;
- struct compat_nfs_string mnt_path;
- struct compat_nfs_string hostname;
- compat_uint_t host_addrlen;
- compat_uptr_t host_addr;
- compat_int_t proto;
- compat_int_t auth_flavourlen;
- compat_uptr_t auth_flavours;
- };
- static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
- {
- struct compat_nfs4_mount_data_v1 *compat =
- (struct compat_nfs4_mount_data_v1 *)data;
- /* copy the fields backwards */
- data->auth_flavours = compat_ptr(compat->auth_flavours);
- data->auth_flavourlen = compat->auth_flavourlen;
- data->proto = compat->proto;
- data->host_addr = compat_ptr(compat->host_addr);
- data->host_addrlen = compat->host_addrlen;
- compat_nfs_string(&data->hostname, &compat->hostname);
- compat_nfs_string(&data->mnt_path, &compat->mnt_path);
- compat_nfs_string(&data->client_addr, &compat->client_addr);
- data->acdirmax = compat->acdirmax;
- data->acdirmin = compat->acdirmin;
- data->acregmax = compat->acregmax;
- data->acregmin = compat->acregmin;
- data->retrans = compat->retrans;
- data->timeo = compat->timeo;
- data->wsize = compat->wsize;
- data->rsize = compat->rsize;
- data->flags = compat->flags;
- data->version = compat->version;
- }
- /*
- * Validate NFSv4 mount options
- */
- static int nfs4_parse_monolithic(struct fs_context *fc,
- struct nfs4_mount_data *data)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
- char *c;
- if (!data) {
- if (is_remount_fc(fc))
- goto done;
- return nfs_invalf(fc,
- "NFS4: mount program didn't pass any mount data");
- }
- ctx->version = 4;
- if (data->version != 1)
- return generic_parse_monolithic(fc, data);
- if (in_compat_syscall())
- nfs4_compat_mount_data_conv(data);
- if (data->host_addrlen > sizeof(ctx->nfs_server.address))
- goto out_no_address;
- if (data->host_addrlen == 0)
- goto out_no_address;
- ctx->nfs_server.addrlen = data->host_addrlen;
- if (copy_from_user(sap, data->host_addr, data->host_addrlen))
- return -EFAULT;
- if (!nfs_verify_server_address(sap))
- goto out_no_address;
- ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
- if (data->auth_flavourlen) {
- rpc_authflavor_t pseudoflavor;
- if (data->auth_flavourlen > 1)
- goto out_inval_auth;
- if (copy_from_user(&pseudoflavor, data->auth_flavours,
- sizeof(pseudoflavor)))
- return -EFAULT;
- ctx->selected_flavor = pseudoflavor;
- } else {
- ctx->selected_flavor = RPC_AUTH_UNIX;
- }
- c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
- if (IS_ERR(c))
- return PTR_ERR(c);
- ctx->nfs_server.hostname = c;
- c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
- if (IS_ERR(c))
- return PTR_ERR(c);
- ctx->nfs_server.export_path = c;
- dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
- c = strndup_user(data->client_addr.data, 16);
- if (IS_ERR(c))
- return PTR_ERR(c);
- ctx->client_address = c;
- /*
- * Translate to nfs_fs_context, which nfs_fill_super
- * can deal with.
- */
- ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
- ctx->rsize = data->rsize;
- ctx->wsize = data->wsize;
- ctx->timeo = data->timeo;
- ctx->retrans = data->retrans;
- ctx->acregmin = data->acregmin;
- ctx->acregmax = data->acregmax;
- ctx->acdirmin = data->acdirmin;
- ctx->acdirmax = data->acdirmax;
- ctx->nfs_server.protocol = data->proto;
- nfs_validate_transport_protocol(ctx);
- if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
- goto out_invalid_transport_udp;
- done:
- ctx->skip_reconfig_option_check = true;
- return 0;
- out_inval_auth:
- return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
- data->auth_flavourlen);
- out_no_address:
- return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
- out_invalid_transport_udp:
- return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
- }
- #endif
- /*
- * Parse a monolithic block of data from sys_mount().
- */
- static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
- void *data)
- {
- if (fc->fs_type == &nfs_fs_type)
- return nfs23_parse_monolithic(fc, data);
- #if IS_ENABLED(CONFIG_NFS_V4)
- if (fc->fs_type == &nfs4_fs_type)
- return nfs4_parse_monolithic(fc, data);
- #endif
- return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
- }
- /*
- * Validate the preparsed information in the config.
- */
- static int nfs_fs_context_validate(struct fs_context *fc)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- struct nfs_subversion *nfs_mod;
- struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
- int max_namelen = PAGE_SIZE;
- int max_pathlen = NFS_MAXPATHLEN;
- int port = 0;
- int ret;
- if (!fc->source)
- goto out_no_device_name;
- /* Check for sanity first. */
- if (ctx->minorversion && ctx->version != 4)
- goto out_minorversion_mismatch;
- if (ctx->options & NFS_OPTION_MIGRATION &&
- (ctx->version != 4 || ctx->minorversion != 0))
- goto out_migration_misuse;
- /* Verify that any proto=/mountproto= options match the address
- * families in the addr=/mountaddr= options.
- */
- if (ctx->protofamily != AF_UNSPEC &&
- ctx->protofamily != ctx->nfs_server.address.sa_family)
- goto out_proto_mismatch;
- if (ctx->mountfamily != AF_UNSPEC) {
- if (ctx->mount_server.addrlen) {
- if (ctx->mountfamily != ctx->mount_server.address.sa_family)
- goto out_mountproto_mismatch;
- } else {
- if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
- goto out_mountproto_mismatch;
- }
- }
- if (!nfs_verify_server_address(sap))
- goto out_no_address;
- if (ctx->version == 4) {
- if (IS_ENABLED(CONFIG_NFS_V4)) {
- if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
- port = NFS_RDMA_PORT;
- else
- port = NFS_PORT;
- max_namelen = NFS4_MAXNAMLEN;
- max_pathlen = NFS4_MAXPATHLEN;
- nfs_validate_transport_protocol(ctx);
- if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
- goto out_invalid_transport_udp;
- ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
- NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
- NFS_MOUNT_LOCAL_FCNTL);
- } else {
- goto out_v4_not_compiled;
- }
- } else {
- nfs_set_mount_transport_protocol(ctx);
- #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
- if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
- goto out_invalid_transport_udp;
- #endif
- if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
- port = NFS_RDMA_PORT;
- }
- nfs_set_port(sap, &ctx->nfs_server.port, port);
- ret = nfs_parse_source(fc, max_namelen, max_pathlen);
- if (ret < 0)
- return ret;
- /* Load the NFS protocol module if we haven't done so yet */
- if (!ctx->nfs_mod) {
- nfs_mod = get_nfs_version(ctx->version);
- if (IS_ERR(nfs_mod)) {
- ret = PTR_ERR(nfs_mod);
- goto out_version_unavailable;
- }
- ctx->nfs_mod = nfs_mod;
- }
- /* Ensure the filesystem context has the correct fs_type */
- if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
- module_put(fc->fs_type->owner);
- __module_get(ctx->nfs_mod->nfs_fs->owner);
- fc->fs_type = ctx->nfs_mod->nfs_fs;
- }
- return 0;
- out_no_device_name:
- return nfs_invalf(fc, "NFS: Device name not specified");
- out_v4_not_compiled:
- nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
- return -EPROTONOSUPPORT;
- out_invalid_transport_udp:
- return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
- out_no_address:
- return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
- out_mountproto_mismatch:
- return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
- out_proto_mismatch:
- return nfs_invalf(fc, "NFS: Server address does not match proto= option");
- out_minorversion_mismatch:
- return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
- ctx->version, ctx->minorversion);
- out_migration_misuse:
- return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
- out_version_unavailable:
- nfs_errorf(fc, "NFS: Version unavailable");
- return ret;
- }
- /*
- * Create an NFS superblock by the appropriate method.
- */
- static int nfs_get_tree(struct fs_context *fc)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- int err = nfs_fs_context_validate(fc);
- if (err)
- return err;
- if (!ctx->internal)
- return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
- else
- return nfs_get_tree_common(fc);
- }
- /*
- * Handle duplication of a configuration. The caller copied *src into *sc, but
- * it can't deal with resource pointers in the filesystem context, so we have
- * to do that. We need to clear pointers, copy data or get extra refs as
- * appropriate.
- */
- static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
- {
- struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
- ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
- if (!ctx)
- return -ENOMEM;
- ctx->mntfh = nfs_alloc_fhandle();
- if (!ctx->mntfh) {
- kfree(ctx);
- return -ENOMEM;
- }
- nfs_copy_fh(ctx->mntfh, src->mntfh);
- __module_get(ctx->nfs_mod->owner);
- ctx->client_address = NULL;
- ctx->mount_server.hostname = NULL;
- ctx->nfs_server.export_path = NULL;
- ctx->nfs_server.hostname = NULL;
- ctx->fscache_uniq = NULL;
- ctx->clone_data.fattr = NULL;
- fc->fs_private = ctx;
- return 0;
- }
- static void nfs_fs_context_free(struct fs_context *fc)
- {
- struct nfs_fs_context *ctx = nfs_fc2context(fc);
- if (ctx) {
- if (ctx->server)
- nfs_free_server(ctx->server);
- if (ctx->nfs_mod)
- put_nfs_version(ctx->nfs_mod);
- kfree(ctx->client_address);
- kfree(ctx->mount_server.hostname);
- kfree(ctx->nfs_server.export_path);
- kfree(ctx->nfs_server.hostname);
- kfree(ctx->fscache_uniq);
- nfs_free_fhandle(ctx->mntfh);
- nfs_free_fattr(ctx->clone_data.fattr);
- kfree(ctx);
- }
- }
- static const struct fs_context_operations nfs_fs_context_ops = {
- .free = nfs_fs_context_free,
- .dup = nfs_fs_context_dup,
- .parse_param = nfs_fs_context_parse_param,
- .parse_monolithic = nfs_fs_context_parse_monolithic,
- .get_tree = nfs_get_tree,
- .reconfigure = nfs_reconfigure,
- };
- /*
- * Prepare superblock configuration. We use the namespaces attached to the
- * context. This may be the current process's namespaces, or it may be a
- * container's namespaces.
- */
- static int nfs_init_fs_context(struct fs_context *fc)
- {
- struct nfs_fs_context *ctx;
- ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
- if (unlikely(!ctx))
- return -ENOMEM;
- ctx->mntfh = nfs_alloc_fhandle();
- if (unlikely(!ctx->mntfh)) {
- kfree(ctx);
- return -ENOMEM;
- }
- ctx->protofamily = AF_UNSPEC;
- ctx->mountfamily = AF_UNSPEC;
- ctx->mount_server.port = NFS_UNSPEC_PORT;
- if (fc->root) {
- /* reconfigure, start with the current config */
- struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
- struct net *net = nfss->nfs_client->cl_net;
- ctx->flags = nfss->flags;
- ctx->rsize = nfss->rsize;
- ctx->wsize = nfss->wsize;
- ctx->retrans = nfss->client->cl_timeout->to_retries;
- ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
- ctx->acregmin = nfss->acregmin / HZ;
- ctx->acregmax = nfss->acregmax / HZ;
- ctx->acdirmin = nfss->acdirmin / HZ;
- ctx->acdirmax = nfss->acdirmax / HZ;
- ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
- ctx->nfs_server.port = nfss->port;
- ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
- ctx->version = nfss->nfs_client->rpc_ops->version;
- ctx->minorversion = nfss->nfs_client->cl_minorversion;
- memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
- ctx->nfs_server.addrlen);
- if (fc->net_ns != net) {
- put_net(fc->net_ns);
- fc->net_ns = get_net(net);
- }
- ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
- __module_get(ctx->nfs_mod->owner);
- } else {
- /* defaults */
- ctx->timeo = NFS_UNSPEC_TIMEO;
- ctx->retrans = NFS_UNSPEC_RETRANS;
- ctx->acregmin = NFS_DEF_ACREGMIN;
- ctx->acregmax = NFS_DEF_ACREGMAX;
- ctx->acdirmin = NFS_DEF_ACDIRMIN;
- ctx->acdirmax = NFS_DEF_ACDIRMAX;
- ctx->nfs_server.port = NFS_UNSPEC_PORT;
- ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
- ctx->minorversion = 0;
- ctx->need_mount = true;
- }
- fc->fs_private = ctx;
- fc->ops = &nfs_fs_context_ops;
- return 0;
- }
- struct file_system_type nfs_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs",
- .init_fs_context = nfs_init_fs_context,
- .parameters = nfs_fs_parameters,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
- };
- MODULE_ALIAS_FS("nfs");
- EXPORT_SYMBOL_GPL(nfs_fs_type);
- #if IS_ENABLED(CONFIG_NFS_V4)
- struct file_system_type nfs4_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .init_fs_context = nfs_init_fs_context,
- .parameters = nfs_fs_parameters,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
- };
- MODULE_ALIAS_FS("nfs4");
- MODULE_ALIAS("nfs4");
- EXPORT_SYMBOL_GPL(nfs4_fs_type);
- #endif /* CONFIG_NFS_V4 */
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