From patchwork Wed Nov 20 15:27:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Scott Mayhew X-Patchwork-Id: 11254139 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 057BC930 for ; Wed, 20 Nov 2019 15:29:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BCF6A206CC for ; Wed, 20 Nov 2019 15:29:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="M1qwzFcv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729255AbfKTP3G (ORCPT ); Wed, 20 Nov 2019 10:29:06 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:55610 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730279AbfKTP2C (ORCPT ); Wed, 20 Nov 2019 10:28:02 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574263678; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BDZEUumrmm72LH3M4zYe8gRwKffSxband5tl6GYjPQc=; b=M1qwzFcvWcTLkw3iIVBKUSx1c+7FYnpBYgOQYpdmpuiL+P9f7TBkWsiiZa+n9QdW4h2GVr WDRzsorioieQJCoeFHk6bDpPKLRjAluo2xQJzkaiCEVyTrnZ2z61E5aasd7ckfAH0h3hqv 9BOxLcY3lhGwjElLcfVseoZZCB+3uTU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-264-sbLt45RBM2GjfBOXZBi-UQ-1; Wed, 20 Nov 2019 10:27:54 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6252F1005512; Wed, 20 Nov 2019 15:27:53 +0000 (UTC) Received: from coeurl.usersys.redhat.com (ovpn-123-90.rdu2.redhat.com [10.10.123.90]) by smtp.corp.redhat.com (Postfix) with ESMTP id BAAB85C1D4; Wed, 20 Nov 2019 15:27:52 +0000 (UTC) Received: by coeurl.usersys.redhat.com (Postfix, from userid 1000) id A1AB220AC2; Wed, 20 Nov 2019 10:27:50 -0500 (EST) From: Scott Mayhew To: anna.schumaker@netapp.com, trond.myklebust@hammerspace.com Cc: dhowells@redhat.com, viro@zeniv.linux.org.uk, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 25/27] NFS: Add fs_context support. Date: Wed, 20 Nov 2019 10:27:48 -0500 Message-Id: <20191120152750.6880-26-smayhew@redhat.com> In-Reply-To: <20191120152750.6880-1-smayhew@redhat.com> References: <20191120152750.6880-1-smayhew@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-MC-Unique: sbLt45RBM2GjfBOXZBi-UQ-1 X-Mimecast-Spam-Score: 0 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: David Howells Add filesystem context support to NFS, parsing the options in advance and attaching the information to struct nfs_fs_context. The highlights are: (*) Merge nfs_mount_info and nfs_clone_mount into nfs_fs_context. This structure represents NFS's superblock config. (*) Make use of the VFS's parsing support to split comma-separated lists (*) Pin the NFS protocol module in the nfs_fs_context. (*) Attach supplementary error information to fs_context. This has the downside that these strings must be static and can't be formatted. (*) Remove the auxiliary file_system_type structs since the information necessary can be conveyed in the nfs_fs_context struct instead. (*) Root mounts are made by duplicating the config for the requested mount so as to have the same parameters. Submounts pick up their parameters from the parent superblock. [AV -- retrans is u32, not string] [SM -- Renamed cfg to ctx in a few functions in an earlier patch] [SM -- Moved fs_context mount option parsing to an earlier patch] [SM -- Moved fs_context error logging to a later patch] [SM -- Fixed printks in nfs4_try_get_tree() and nfs4_get_referral_tree()] [SM -- Added is_remount_fc() helper] [SM -- Deferred some refactoring to a later patch] [SM -- Fixed referral mounts, which were broken in the original patch] [SM -- Fixed leak of nfs_fattr when fs_context is freed] Signed-off-by: David Howells Signed-off-by: Al Viro Signed-off-by: Scott Mayhew --- fs/nfs/fs_context.c | 470 +++++++++++++++++++++++++++------------- fs/nfs/internal.h | 74 +++---- fs/nfs/namespace.c | 134 +++++++----- fs/nfs/nfs3proc.c | 2 +- fs/nfs/nfs4_fs.h | 9 +- fs/nfs/nfs4namespace.c | 291 ++++++++++++++----------- fs/nfs/nfs4proc.c | 2 +- fs/nfs/nfs4super.c | 151 +++++++------ fs/nfs/proc.c | 2 +- fs/nfs/super.c | 286 +++++++----------------- include/linux/nfs_xdr.h | 6 +- 11 files changed, 768 insertions(+), 659 deletions(-) diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c index 9a3162055d5d..ac1a8d7d7393 100644 --- a/fs/nfs/fs_context.c +++ b/fs/nfs/fs_context.c @@ -3,6 +3,7 @@ * linux/fs/nfs/fs_context.c * * Copyright (C) 1992 Rick Sladkey + * Conversion to new mount api Copyright (C) David Howells * * NFS mount handling. * @@ -467,21 +468,31 @@ static int nfs_parse_version_string(struct nfs_fs_context *ctx, /* * Parse a single mount parameter. */ -static int nfs_fs_context_parse_param(struct nfs_fs_context *ctx, +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(NULL, &nfs_fs_parameters, param, &result); + 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) { + dfprintk(MOUNT, "NFS: Multiple sources not supported\n"); + return -EINVAL; + } + fc->source = param->string; + param->string = NULL; + break; + /* * boolean options: foo/nofoo */ @@ -807,112 +818,6 @@ static int nfs_fs_context_parse_param(struct nfs_fs_context *ctx, return -ERANGE; } -/* cribbed from generic_parse_monolithic and vfs_parse_fs_string */ -static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) -{ - int ret; - char *key = p, *value; - size_t v_size = 0; - struct fs_parameter param; - - memset(¶m, 0, sizeof(param)); - value = strchr(key, '='); - if (value && value != key) { - *value++ = 0; - v_size = strlen(value); - } - param.key = key; - param.type = fs_value_is_flag; - param.size = v_size; - if (v_size > 0) { - param.type = fs_value_is_string; - param.string = kmemdup_nul(value, v_size, GFP_KERNEL); - if (!param.string) - return -ENOMEM; - } - ret = nfs_fs_context_parse_param(ctx, ¶m); - kfree(param.string); - return ret; -} - -/* - * Error-check and convert a string of mount options from user space into - * a data structure. The whole mount string is processed; bad options are - * skipped as they are encountered. If there were no errors, return 1; - * otherwise return 0 (zero). - */ -int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx) -{ - char *p; - int rc, sloppy = 0, invalid_option = 0; - - if (!raw) { - dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); - return 1; - } - dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); - - rc = security_sb_eat_lsm_opts(raw, &ctx->lsm_opts); - if (rc) - goto out_security_failure; - - while ((p = strsep(&raw, ",")) != NULL) { - if (!*p) - continue; - if (nfs_fs_context_parse_option(ctx, p) < 0) - invalid_option = true; - } - - if (!sloppy && invalid_option) - return 0; - - 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; - } - } - - return 1; - -out_minorversion_mismatch: - printk(KERN_INFO "NFS: mount option vers=%u does not support " - "minorversion=%u\n", ctx->version, ctx->minorversion); - return 0; -out_mountproto_mismatch: - printk(KERN_INFO "NFS: mount server address does not match mountproto= " - "option\n"); - return 0; -out_proto_mismatch: - printk(KERN_INFO "NFS: server address does not match proto= option\n"); - return 0; -out_migration_misuse: - printk(KERN_INFO - "NFS: 'migration' not supported for this NFS version\n"); - return -EINVAL; -out_security_failure: - printk(KERN_INFO "NFS: security options invalid: %d\n", rc); - return 0; -} - /* * Split "dev_name" into "hostname:export_path". * @@ -990,6 +895,11 @@ static int nfs_parse_devname(struct nfs_fs_context *ctx, 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 @@ -1006,12 +916,11 @@ static int nfs_parse_devname(struct nfs_fs_context *ctx, * + breaking back: trying proto=udp after proto=tcp, v2 after v3, * mountproto=tcp after mountproto=udp, and so on */ -static int nfs23_validate_mount_data(void *options, - struct nfs_fs_context *ctx, - struct nfs_fh *mntfh, - const char *dev_name) +static int nfs23_parse_monolithic(struct fs_context *fc, + struct nfs_mount_data *data) { - struct nfs_mount_data *data = (struct nfs_mount_data *)options; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct nfs_fh *mntfh = ctx->mount_info.mntfh; struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; @@ -1083,6 +992,9 @@ static int nfs23_validate_mount_data(void *options, 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; @@ -1090,8 +1002,6 @@ static int nfs23_validate_mount_data(void *options, ctx->selected_flavor = data->pseudoflavor; else ctx->selected_flavor = RPC_AUTH_UNIX; - if (!ctx->nfs_server.hostname) - goto out_nomem; if (!(data->flags & NFS_MOUNT_NONLM)) ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| @@ -1109,12 +1019,13 @@ static int nfs23_validate_mount_data(void *options, */ if (data->context[0]){ #ifdef CONFIG_SECURITY_SELINUX - int rc; + int ret; + data->context[NFS_MAX_CONTEXT_LEN] = '\0'; - rc = security_add_mnt_opt("context", data->context, - strlen(data->context), ctx->lsm_opts); - if (rc) - return rc; + ret = vfs_parse_fs_string(fc, "context", + data->context, strlen(data->context)); + if (ret < 0) + return ret; #else return -EINVAL; #endif @@ -1122,12 +1033,20 @@ static int nfs23_validate_mount_data(void *options, break; default: - return NFS_TEXT_DATA; + 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; + } dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); return -EINVAL; @@ -1163,12 +1082,11 @@ static void nfs4_validate_mount_flags(struct nfs_fs_context *ctx) /* * Validate NFSv4 mount options */ -static int nfs4_validate_mount_data(void *options, - struct nfs_fs_context *ctx, - const char *dev_name) +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; - struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; char *c; if (data == NULL) @@ -1218,7 +1136,7 @@ static int nfs4_validate_mount_data(void *options, ctx->client_address = c; /* - * Translate to nfs_fs_context, which nfs4_fill_super + * Translate to nfs_fs_context, which nfs_fill_super * can deal with. */ @@ -1238,12 +1156,20 @@ static int nfs4_validate_mount_data(void *options, break; default: - return NFS_TEXT_DATA; + 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; + } dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); return -EINVAL; @@ -1260,39 +1186,66 @@ static int nfs4_validate_mount_data(void *options, dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); return -EINVAL; } +#endif -int nfs_validate_mount_data(struct file_system_type *fs_type, - void *options, - struct nfs_fs_context *ctx, - struct nfs_fh *mntfh, - const char *dev_name) -{ - if (fs_type == &nfs_fs_type) - return nfs23_validate_mount_data(options, ctx, mntfh, dev_name); - return nfs4_validate_mount_data(options, ctx, dev_name); -} -#else -int nfs_validate_mount_data(struct file_system_type *fs_type, - void *options, - struct nfs_fs_context *ctx, - struct nfs_fh *mntfh, - const char *dev_name) +/* + * Parse a monolithic block of data from sys_mount(). + */ +static int nfs_fs_context_parse_monolithic(struct fs_context *fc, + void *data) { - return nfs23_validate_mount_data(options, ctx, mntfh, dev_name); -} + 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 -int nfs_validate_text_mount_data(void *options, - struct nfs_fs_context *ctx, - const char *dev_name) + dfprintk(MOUNT, "NFS: Unsupported monolithic data version\n"); + return -EINVAL; +} + +/* + * Validate the preparsed information in the config. + */ +static int nfs_fs_context_validate(struct fs_context *fc) { - int port = 0; + 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; - struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; + int port = 0; + int ret; - if (nfs_parse_mount_options((char *)options, ctx) == 0) - return -EINVAL; + 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; @@ -1320,8 +1273,24 @@ int nfs_validate_text_mount_data(void *options, nfs_set_port(sap, &ctx->nfs_server.port, port); - return nfs_parse_devname(ctx, dev_name, max_namelen, max_pathlen); + ret = nfs_parse_devname(ctx, fc->source, max_namelen, max_pathlen); + if (ret < 0) + return ret; + + /* Load the NFS protocol module if we haven't done so yet */ + if (!ctx->mount_info.nfs_mod) { + nfs_mod = get_nfs_version(ctx->version); + if (IS_ERR(nfs_mod)) { + ret = PTR_ERR(nfs_mod); + goto out_version_unavailable; + } + ctx->mount_info.nfs_mod = nfs_mod; + } + return 0; +out_no_device_name: + dfprintk(MOUNT, "NFS: Device name not specified\n"); + return -EINVAL; #if !IS_ENABLED(CONFIG_NFS_V4) out_v4_not_compiled: dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); @@ -1331,8 +1300,201 @@ int nfs_validate_text_mount_data(void *options, dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); return -EINVAL; #endif /* !CONFIG_NFS_V4 */ - out_no_address: dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); return -EINVAL; +out_mountproto_mismatch: + dfprintk(MOUNT, "NFS: Mount server address does not match mountproto= option\n"); + return -EINVAL; +out_proto_mismatch: + dfprintk(MOUNT, "NFS: Server address does not match proto= option\n"); + return -EINVAL; +out_minorversion_mismatch: + dfprintk(MOUNT, "NFS: Mount option vers=%u does not support minorversion=%u\n", + ctx->version, ctx->minorversion); + return -EINVAL; +out_migration_misuse: + dfprintk(MOUNT, "NFS: 'Migration' not supported for this NFS version\n"); + return -EINVAL; +out_version_unavailable: + dfprintk(MOUNT, "NFS: Version unavailable\n"); + 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->mount_info.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->mount_info.mntfh = nfs_alloc_fhandle(); + if (!ctx->mount_info.mntfh) { + kfree(ctx); + return -ENOMEM; + } + nfs_copy_fh(ctx->mount_info.mntfh, src->mount_info.mntfh); + + __module_get(ctx->mount_info.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.addr = 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->mount_info.server) + nfs_free_server(ctx->mount_info.server); + if (ctx->mount_info.nfs_mod) + put_nfs_version(ctx->mount_info.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->mount_info.mntfh); + kfree(ctx->clone_data.addr); + 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->mount_info.ctx = ctx; + ctx->mount_info.mntfh = nfs_alloc_fhandle(); + if (unlikely(!ctx->mount_info.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->mount_info.nfs_mod = nfss->nfs_client->cl_nfs_mod; + __module_get(ctx->mount_info.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; + } + ctx->net = fc->net_ns; + 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 */ diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 06aae88a8fa1..ccbff3a9ccf6 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -4,7 +4,7 @@ */ #include "nfs4_fs.h" -#include +#include #include #include #include @@ -16,6 +16,7 @@ extern const struct export_operations nfs_export_ops; struct nfs_string; +struct nfs_pageio_descriptor; static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) { @@ -34,12 +35,13 @@ static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) struct nfs_clone_mount { const struct super_block *sb; - const struct dentry *dentry; + struct dentry *dentry; char *hostname; char *mnt_path; struct sockaddr *addr; size_t addrlen; rpc_authflavor_t authflavor; + struct nfs_fattr *fattr; }; /* @@ -78,10 +80,23 @@ struct nfs_client_initdata { const struct cred *cred; }; +struct nfs_mount_info { + unsigned int inherited_bsize; + struct nfs_fs_context *ctx; + struct nfs_clone_mount *cloned; + struct nfs_server *server; + struct nfs_fh *mntfh; + struct nfs_subversion *nfs_mod; +}; + /* * In-kernel mount arguments */ struct nfs_fs_context { + bool internal; + bool skip_reconfig_option_check; + bool need_mount; + bool sloppy; unsigned int flags; /* NFS{,4}_MOUNT_* flags */ unsigned int rsize, wsize; unsigned int timeo, retrans; @@ -98,8 +113,6 @@ struct nfs_fs_context { char *fscache_uniq; unsigned short protofamily; unsigned short mountfamily; - bool need_mount; - bool sloppy; struct { union { @@ -124,14 +137,23 @@ struct nfs_fs_context { int port; unsigned short protocol; unsigned short nconnect; + unsigned short export_path_len; } nfs_server; void *lsm_opts; struct net *net; char buf[32]; /* Parse buffer */ + + struct nfs_mount_info mount_info; + struct nfs_clone_mount clone_data; }; +static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) +{ + return fc->fs_private; +} + /* mount_clnt.c */ struct nfs_mount_request { struct sockaddr *sap; @@ -147,15 +169,6 @@ struct nfs_mount_request { struct net *net; }; -struct nfs_mount_info { - unsigned int inherited_bsize; - struct nfs_fs_context *ctx; - struct nfs_clone_mount *cloned; - struct nfs_server *server; - struct nfs_fh *mntfh; - struct nfs_subversion *nfs_mod; -}; - extern int nfs_mount(struct nfs_mount_request *info); extern void nfs_umount(const struct nfs_mount_request *info); @@ -235,22 +248,8 @@ static inline void nfs_fs_proc_exit(void) extern const struct svc_version nfs4_callback_version1; extern const struct svc_version nfs4_callback_version4; -struct nfs_pageio_descriptor; - -/* mount.c */ -#define NFS_TEXT_DATA 1 - -extern struct nfs_fs_context *nfs_alloc_parsed_mount_data(void); -extern void nfs_free_parsed_mount_data(struct nfs_fs_context *ctx); -extern int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx); -extern int nfs_validate_mount_data(struct file_system_type *fs_type, - void *options, - struct nfs_fs_context *ctx, - struct nfs_fh *mntfh, - const char *dev_name); -extern int nfs_validate_text_mount_data(void *options, - struct nfs_fs_context *ctx, - const char *dev_name); +/* fs_context.c */ +extern struct file_system_type nfs_fs_type; /* pagelist.c */ extern int __init nfs_init_nfspagecache(void); @@ -411,14 +410,9 @@ extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); /* super.c */ extern const struct super_operations nfs_sops; -extern struct file_system_type nfs_fs_type; -extern struct file_system_type nfs_prepared_fs_type; -#if IS_ENABLED(CONFIG_NFS_V4) -extern struct file_system_type nfs4_referral_fs_type; -#endif bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); -struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *); -struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); +int nfs_try_get_tree(struct fs_context *); +int nfs_get_tree_common(struct fs_context *); void nfs_kill_super(struct super_block *); extern struct rpc_stat nfs_rpcstat; @@ -446,10 +440,8 @@ static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) extern char *nfs_path(char **p, struct dentry *dentry, char *buffer, ssize_t buflen, unsigned flags); extern struct vfsmount *nfs_d_automount(struct path *path); -struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, - struct nfs_fh *, struct nfs_fattr *); -struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, - struct nfs_fattr *, rpc_authflavor_t); +int nfs_submount(struct fs_context *, struct nfs_server *); +int nfs_do_submount(struct fs_context *); /* getroot.c */ extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, @@ -476,7 +468,7 @@ int nfs_show_options(struct seq_file *, struct dentry *); int nfs_show_devname(struct seq_file *, struct dentry *); int nfs_show_path(struct seq_file *, struct dentry *); int nfs_show_stats(struct seq_file *, struct dentry *); -int nfs_remount(struct super_block *sb, int *flags, char *raw_data); +int nfs_reconfigure(struct fs_context *); /* write.c */ extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c index 72a99f9c7390..927b0f732148 100644 --- a/fs/nfs/namespace.c +++ b/fs/nfs/namespace.c @@ -140,31 +140,62 @@ EXPORT_SYMBOL_GPL(nfs_path); */ struct vfsmount *nfs_d_automount(struct path *path) { - struct vfsmount *mnt; + struct nfs_fs_context *ctx; + struct fs_context *fc; + struct vfsmount *mnt = ERR_PTR(-ENOMEM); struct nfs_server *server = NFS_SERVER(d_inode(path->dentry)); - struct nfs_fh *fh = NULL; - struct nfs_fattr *fattr = NULL; + struct nfs_client *client = server->nfs_client; + int ret; if (IS_ROOT(path->dentry)) return ERR_PTR(-ESTALE); - mnt = ERR_PTR(-ENOMEM); - fh = nfs_alloc_fhandle(); - fattr = nfs_alloc_fattr(); - if (fh == NULL || fattr == NULL) - goto out; + /* Open a new filesystem context, transferring parameters from the + * parent superblock, including the network namespace. + */ + fc = fs_context_for_submount(&nfs_fs_type, path->dentry); + if (IS_ERR(fc)) + return ERR_CAST(fc); - mnt = server->nfs_client->rpc_ops->submount(server, path->dentry, fh, fattr); + ctx = nfs_fc2context(fc); + ctx->clone_data.dentry = path->dentry; + ctx->clone_data.sb = path->dentry->d_sb; + ctx->clone_data.fattr = nfs_alloc_fattr(); + if (!ctx->clone_data.fattr) + goto out_fc; + + if (fc->net_ns != client->cl_net) { + put_net(fc->net_ns); + fc->net_ns = get_net(client->cl_net); + } + + /* for submounts we want the same server; referrals will reassign */ + memcpy(&ctx->nfs_server.address, &client->cl_addr, client->cl_addrlen); + ctx->nfs_server.addrlen = client->cl_addrlen; + ctx->nfs_server.port = server->port; + + ctx->version = client->rpc_ops->version; + ctx->minorversion = client->cl_minorversion; + ctx->mount_info.nfs_mod = client->cl_nfs_mod; + __module_get(ctx->mount_info.nfs_mod->owner); + + ret = client->rpc_ops->submount(fc, server); + if (ret < 0) { + mnt = ERR_PTR(ret); + goto out_fc; + } + + up_write(&fc->root->d_sb->s_umount); + mnt = vfs_create_mount(fc); if (IS_ERR(mnt)) - goto out; + goto out_fc; mntget(mnt); /* prevent immediate expiration */ mnt_set_expiry(mnt, &nfs_automount_list); schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout); -out: - nfs_free_fattr(fattr); - nfs_free_fhandle(fh); +out_fc: + put_fs_context(fc); return mnt; } @@ -219,61 +250,62 @@ void nfs_release_automount_timer(void) * @authflavor: security flavor to use when performing the mount * */ -struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh, - struct nfs_fattr *fattr, rpc_authflavor_t authflavor) +int nfs_do_submount(struct fs_context *fc) { - struct super_block *sb = dentry->d_sb; - struct nfs_clone_mount mountdata = { - .sb = sb, - .dentry = dentry, - .authflavor = authflavor, - }; - struct nfs_mount_info mount_info = { - .inherited_bsize = sb->s_blocksize_bits, - .cloned = &mountdata, - .mntfh = fh, - .nfs_mod = NFS_SB(sb)->nfs_client->cl_nfs_mod, - }; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct dentry *dentry = ctx->clone_data.dentry; struct nfs_server *server; - struct vfsmount *mnt; - char *page = (char *) __get_free_page(GFP_USER); - char *devname; + char *buffer, *p; + int ret; - if (page == NULL) - return ERR_PTR(-ENOMEM); + /* create a new volume representation */ + server = ctx->mount_info.nfs_mod->rpc_ops->clone_server(NFS_SB(ctx->clone_data.sb), + ctx->mount_info.mntfh, + ctx->clone_data.fattr, + ctx->selected_flavor); - server = mount_info.nfs_mod->rpc_ops->clone_server(NFS_SB(sb), fh, - fattr, authflavor); if (IS_ERR(server)) - return ERR_CAST(server); + return PTR_ERR(server); - mount_info.server = server; + ctx->mount_info.server = server; - devname = nfs_devname(dentry, page, PAGE_SIZE); - if (IS_ERR(devname)) - mnt = ERR_CAST(devname); - else - mnt = vfs_submount(dentry, &nfs_prepared_fs_type, devname, &mount_info); + buffer = kmalloc(4096, GFP_USER); + if (!buffer) + return -ENOMEM; - if (mount_info.server) - nfs_free_server(mount_info.server); - free_page((unsigned long)page); - return mnt; + ctx->internal = true; + ctx->mount_info.inherited_bsize = ctx->clone_data.sb->s_blocksize_bits; + + p = nfs_devname(dentry, buffer, 4096); + if (IS_ERR(p)) { + dprintk("NFS: Couldn't determine submount pathname\n"); + ret = PTR_ERR(p); + } else { + ret = vfs_parse_fs_string(fc, "source", p, buffer + 4096 - p); + if (!ret) + ret = vfs_get_tree(fc); + } + kfree(buffer); + return ret; } EXPORT_SYMBOL_GPL(nfs_do_submount); -struct vfsmount *nfs_submount(struct nfs_server *server, struct dentry *dentry, - struct nfs_fh *fh, struct nfs_fattr *fattr) +int nfs_submount(struct fs_context *fc, struct nfs_server *server) { - int err; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct dentry *dentry = ctx->clone_data.dentry; struct dentry *parent = dget_parent(dentry); + int err; /* Look it up again to get its attributes */ - err = server->nfs_client->rpc_ops->lookup(d_inode(parent), &dentry->d_name, fh, fattr, NULL); + err = server->nfs_client->rpc_ops->lookup(d_inode(parent), &dentry->d_name, + ctx->mount_info.mntfh, ctx->clone_data.fattr, + NULL); dput(parent); if (err != 0) - return ERR_PTR(err); + return err; - return nfs_do_submount(dentry, fh, fattr, server->client->cl_auth->au_flavor); + ctx->selected_flavor = server->client->cl_auth->au_flavor; + return nfs_do_submount(fc); } EXPORT_SYMBOL_GPL(nfs_submount); diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c index 9eb2f1a503ab..657041c3a03f 100644 --- a/fs/nfs/nfs3proc.c +++ b/fs/nfs/nfs3proc.c @@ -990,7 +990,7 @@ const struct nfs_rpc_ops nfs_v3_clientops = { .nlmclnt_ops = &nlmclnt_fl_close_lock_ops, .getroot = nfs3_proc_get_root, .submount = nfs_submount, - .try_mount = nfs_try_mount, + .try_get_tree = nfs_try_get_tree, .getattr = nfs3_proc_getattr, .setattr = nfs3_proc_setattr, .lookup = nfs3_proc_lookup, diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index 784608d4982a..638d09cdb584 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -268,14 +268,13 @@ extern const struct dentry_operations nfs4_dentry_operations; int nfs_atomic_open(struct inode *, struct dentry *, struct file *, unsigned, umode_t); -/* super.c */ +/* fs_context.c */ extern struct file_system_type nfs4_fs_type; /* nfs4namespace.c */ struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, const struct qstr *); -struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *, - struct nfs_fh *, struct nfs_fattr *); +int nfs4_submount(struct fs_context *, struct nfs_server *); int nfs4_replace_transport(struct nfs_server *server, const struct nfs4_fs_locations *locations); @@ -515,7 +514,6 @@ extern const nfs4_stateid invalid_stateid; /* nfs4super.c */ struct nfs_mount_info; extern struct nfs_subversion nfs_v4; -struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *); extern bool nfs4_disable_idmapping; extern unsigned short max_session_slots; extern unsigned short max_session_cb_slots; @@ -525,6 +523,9 @@ extern bool recover_lost_locks; #define NFS4_CLIENT_ID_UNIQ_LEN (64) extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; +extern int nfs4_try_get_tree(struct fs_context *); +extern int nfs4_get_referral_tree(struct fs_context *); + /* nfs4sysctl.c */ #ifdef CONFIG_SYSCTL int nfs4_register_sysctl(void); diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c index 2e460c33ae48..04985aebe184 100644 --- a/fs/nfs/nfs4namespace.c +++ b/fs/nfs/nfs4namespace.c @@ -8,6 +8,7 @@ * NFSv4 namespace */ +#include #include #include #include @@ -21,37 +22,64 @@ #include #include "internal.h" #include "nfs4_fs.h" +#include "nfs.h" #include "dns_resolve.h" #define NFSDBG_FACILITY NFSDBG_VFS +/* + * Work out the length that an NFSv4 path would render to as a standard posix + * path, with a leading slash but no terminating slash. + */ +static ssize_t nfs4_pathname_len(const struct nfs4_pathname *pathname) +{ + ssize_t len = 0; + int i; + + for (i = 0; i < pathname->ncomponents; i++) { + const struct nfs4_string *component = &pathname->components[i]; + + if (component->len > NAME_MAX) + goto too_long; + len += 1 + component->len; /* Adding "/foo" */ + if (len > PATH_MAX) + goto too_long; + } + return len; + +too_long: + return -ENAMETOOLONG; +} + /* * Convert the NFSv4 pathname components into a standard posix path. - * - * Note that the resulting string will be placed at the end of the buffer */ -static inline char *nfs4_pathname_string(const struct nfs4_pathname *pathname, - char *buffer, ssize_t buflen) +static char *nfs4_pathname_string(const struct nfs4_pathname *pathname, + unsigned short *_len) { - char *end = buffer + buflen; - int n; + ssize_t len; + char *buf, *p; + int i; + + len = nfs4_pathname_len(pathname); + if (len < 0) + return ERR_PTR(len); + *_len = len; + + p = buf = kmalloc(len + 1, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < pathname->ncomponents; i++) { + const struct nfs4_string *component = &pathname->components[i]; - *--end = '\0'; - buflen--; - - n = pathname->ncomponents; - while (--n >= 0) { - const struct nfs4_string *component = &pathname->components[n]; - buflen -= component->len + 1; - if (buflen < 0) - goto Elong; - end -= component->len; - memcpy(end, component->data, component->len); - *--end = '/'; + *p++ = '/'; + memcpy(p, component->data, component->len); + p += component->len; } - return end; -Elong: - return ERR_PTR(-ENAMETOOLONG); + + *p = 0; + return buf; } /* @@ -100,21 +128,28 @@ static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen) */ static int nfs4_validate_fspath(struct dentry *dentry, const struct nfs4_fs_locations *locations, - char *page, char *page2) + struct nfs_fs_context *ctx) { const char *path, *fs_path; + char *buf; + unsigned short len; + int n; - path = nfs4_path(dentry, page, PAGE_SIZE); - if (IS_ERR(path)) + buf = kmalloc(4096, GFP_KERNEL); + path = nfs4_path(dentry, buf, 4096); + if (IS_ERR(path)) { + kfree(buf); return PTR_ERR(path); + } - fs_path = nfs4_pathname_string(&locations->fs_path, page2, PAGE_SIZE); - if (IS_ERR(fs_path)) - return PTR_ERR(fs_path); + fs_path = nfs4_pathname_string(&locations->fs_path, &len); - if (strncmp(path, fs_path, strlen(fs_path)) != 0) { + n = strncmp(path, fs_path, len); + kfree(buf); + kfree(fs_path); + if (n != 0) { dprintk("%s: path %s does not begin with fsroot %s\n", - __func__, path, fs_path); + __func__, path, ctx->nfs_server.export_path); return -ENOENT; } @@ -236,55 +271,83 @@ nfs4_negotiate_security(struct rpc_clnt *clnt, struct inode *inode, return new; } -static struct vfsmount *try_location(struct nfs_clone_mount *mountdata, - char *page, char *page2, - const struct nfs4_fs_location *location) +static int try_location(struct fs_context *fc, + const struct nfs4_fs_location *location) { const size_t addr_bufsize = sizeof(struct sockaddr_storage); - struct net *net = rpc_net_ns(NFS_SB(mountdata->sb)->client); - struct vfsmount *mnt = ERR_PTR(-ENOENT); - char *mnt_path; - unsigned int maxbuflen; - unsigned int s; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + unsigned int len, s; + char *export_path, *source, *p; + int ret = -ENOENT; + + /* Allocate a buffer big enough to hold any of the hostnames plus a + * terminating char and also a buffer big enough to hold the hostname + * plus a colon plus the path. + */ + len = 0; + for (s = 0; s < location->nservers; s++) { + const struct nfs4_string *buf = &location->servers[s]; + if (buf->len > len) + len = buf->len; + } + + kfree(ctx->nfs_server.hostname); + ctx->nfs_server.hostname = kmalloc(len + 1, GFP_KERNEL); + if (!ctx->nfs_server.hostname) + return -ENOMEM; - mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE); - if (IS_ERR(mnt_path)) - return ERR_CAST(mnt_path); - mountdata->mnt_path = mnt_path; - maxbuflen = mnt_path - 1 - page2; + export_path = nfs4_pathname_string(&location->rootpath, + &ctx->nfs_server.export_path_len); + if (IS_ERR(export_path)) + return PTR_ERR(export_path); - mountdata->addr = kmalloc(addr_bufsize, GFP_KERNEL); - if (mountdata->addr == NULL) - return ERR_PTR(-ENOMEM); + ctx->nfs_server.export_path = export_path; + source = kmalloc(len + 1 + ctx->nfs_server.export_path_len + 1, + GFP_KERNEL); + if (!source) + return -ENOMEM; + + kfree(fc->source); + fc->source = source; + + ctx->clone_data.addr = kmalloc(addr_bufsize, GFP_KERNEL); + if (ctx->clone_data.addr == NULL) + return -ENOMEM; for (s = 0; s < location->nservers; s++) { const struct nfs4_string *buf = &location->servers[s]; - if (buf->len <= 0 || buf->len >= maxbuflen) - continue; - if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len)) continue; - mountdata->addrlen = nfs_parse_server_name(buf->data, buf->len, - mountdata->addr, addr_bufsize, net); - if (mountdata->addrlen == 0) + ctx->clone_data.addrlen = + nfs_parse_server_name(buf->data, buf->len, + ctx->clone_data.addr, + addr_bufsize, + fc->net_ns); + if (ctx->clone_data.addrlen == 0) continue; - memcpy(page2, buf->data, buf->len); - page2[buf->len] = '\0'; - mountdata->hostname = page2; + rpc_set_port(ctx->clone_data.addr, NFS_PORT); - snprintf(page, PAGE_SIZE, "%s:%s", - mountdata->hostname, - mountdata->mnt_path); + memcpy(ctx->nfs_server.hostname, buf->data, buf->len); + ctx->nfs_server.hostname[buf->len] = '\0'; + ctx->clone_data.hostname = ctx->nfs_server.hostname; - mnt = vfs_submount(mountdata->dentry, &nfs4_referral_fs_type, page, mountdata); - if (!IS_ERR(mnt)) - break; + p = source; + memcpy(p, buf->data, buf->len); + p += buf->len; + *p++ = ':'; + memcpy(p, ctx->nfs_server.export_path, ctx->nfs_server.export_path_len); + p += ctx->nfs_server.export_path_len; + *p = 0; + + ret = nfs4_get_referral_tree(fc); + if (ret == 0) + return 0; } - kfree(mountdata->addr); - return mnt; + + return ret; } /** @@ -293,38 +356,23 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata, * @locations: array of NFSv4 server location information * */ -static struct vfsmount *nfs_follow_referral(struct dentry *dentry, - const struct nfs4_fs_locations *locations) +static int nfs_follow_referral(struct fs_context *fc, + const struct nfs4_fs_locations *locations) { - struct vfsmount *mnt = ERR_PTR(-ENOENT); - struct nfs_clone_mount mountdata = { - .sb = dentry->d_sb, - .dentry = dentry, - .authflavor = NFS_SB(dentry->d_sb)->client->cl_auth->au_flavor, - }; - char *page = NULL, *page2 = NULL; + struct nfs_fs_context *ctx = nfs_fc2context(fc); int loc, error; if (locations == NULL || locations->nlocations <= 0) - goto out; - - dprintk("%s: referral at %pd2\n", __func__, dentry); - - page = (char *) __get_free_page(GFP_USER); - if (!page) - goto out; + return -ENOENT; - page2 = (char *) __get_free_page(GFP_USER); - if (!page2) - goto out; + dprintk("%s: referral at %pd2\n", __func__, ctx->clone_data.dentry); /* Ensure fs path is a prefix of current dentry path */ - error = nfs4_validate_fspath(dentry, locations, page, page2); - if (error < 0) { - mnt = ERR_PTR(error); - goto out; - } + error = nfs4_validate_fspath(ctx->clone_data.dentry, locations, ctx); + if (error < 0) + return error; + error = -ENOENT; for (loc = 0; loc < locations->nlocations; loc++) { const struct nfs4_fs_location *location = &locations->locations[loc]; @@ -332,15 +380,12 @@ static struct vfsmount *nfs_follow_referral(struct dentry *dentry, location->rootpath.ncomponents == 0) continue; - mnt = try_location(&mountdata, page, page2, location); - if (!IS_ERR(mnt)) - break; + error = try_location(fc, location); + if (error == 0) + return 0; } -out: - free_page((unsigned long) page); - free_page((unsigned long) page2); - return mnt; + return error; } /* @@ -348,71 +393,73 @@ static struct vfsmount *nfs_follow_referral(struct dentry *dentry, * @dentry - dentry of referral * */ -static struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry) +static int nfs_do_refmount(struct fs_context *fc, struct rpc_clnt *client) { - struct vfsmount *mnt = ERR_PTR(-ENOMEM); - struct dentry *parent; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct dentry *dentry, *parent; struct nfs4_fs_locations *fs_locations = NULL; struct page *page; - int err; + int err = -ENOMEM; /* BUG_ON(IS_ROOT(dentry)); */ page = alloc_page(GFP_KERNEL); - if (page == NULL) - return mnt; + if (!page) + return -ENOMEM; fs_locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); - if (fs_locations == NULL) + if (!fs_locations) goto out_free; /* Get locations */ - mnt = ERR_PTR(-ENOENT); - + dentry = ctx->clone_data.dentry; parent = dget_parent(dentry); dprintk("%s: getting locations for %pd2\n", __func__, dentry); err = nfs4_proc_fs_locations(client, d_inode(parent), &dentry->d_name, fs_locations, page); dput(parent); - if (err != 0 || - fs_locations->nlocations <= 0 || + if (err != 0) + goto out_free_2; + + err = -ENOENT; + if (fs_locations->nlocations <= 0 || fs_locations->fs_path.ncomponents <= 0) - goto out_free; + goto out_free_2; - mnt = nfs_follow_referral(dentry, fs_locations); + err = nfs_follow_referral(fc, fs_locations); +out_free_2: + kfree(fs_locations); out_free: __free_page(page); - kfree(fs_locations); - return mnt; + return err; } -struct vfsmount *nfs4_submount(struct nfs_server *server, struct dentry *dentry, - struct nfs_fh *fh, struct nfs_fattr *fattr) +int nfs4_submount(struct fs_context *fc, struct nfs_server *server) { - rpc_authflavor_t flavor = server->client->cl_auth->au_flavor; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct dentry *dentry = ctx->clone_data.dentry; struct dentry *parent = dget_parent(dentry); struct inode *dir = d_inode(parent); const struct qstr *name = &dentry->d_name; struct rpc_clnt *client; - struct vfsmount *mnt; + int ret; /* Look it up again to get its attributes and sec flavor */ - client = nfs4_proc_lookup_mountpoint(dir, name, fh, fattr); + client = nfs4_proc_lookup_mountpoint(dir, name, ctx->mount_info.mntfh, + ctx->clone_data.fattr); dput(parent); if (IS_ERR(client)) - return ERR_CAST(client); + return PTR_ERR(client); - if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { - mnt = nfs_do_refmount(client, dentry); - goto out; + ctx->selected_flavor = client->cl_auth->au_flavor; + if (ctx->clone_data.fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { + ret = nfs_do_refmount(fc, client); + } else { + ret = nfs_do_submount(fc); } - if (client->cl_auth->au_flavor != flavor) - flavor = client->cl_auth->au_flavor; - mnt = nfs_do_submount(dentry, fh, fattr, flavor); -out: rpc_shutdown_client(client); - return mnt; + return ret; } /* diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index caacf5e7f5e1..7fc56d528afb 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -9978,7 +9978,7 @@ const struct nfs_rpc_ops nfs_v4_clientops = { .file_ops = &nfs4_file_operations, .getroot = nfs4_proc_get_root, .submount = nfs4_submount, - .try_mount = nfs4_try_mount, + .try_get_tree = nfs4_try_get_tree, .getattr = nfs4_proc_getattr, .setattr = nfs4_proc_setattr, .lookup = nfs4_proc_lookup, diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c index ca9740137cfe..96edee546b8a 100644 --- a/fs/nfs/nfs4super.c +++ b/fs/nfs/nfs4super.c @@ -4,6 +4,7 @@ */ #include #include +#include #include #include #include "delegation.h" @@ -18,16 +19,6 @@ static int nfs4_write_inode(struct inode *inode, struct writeback_control *wbc); static void nfs4_evict_inode(struct inode *inode); -static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data); - -struct file_system_type nfs4_referral_fs_type = { - .owner = THIS_MODULE, - .name = "nfs4", - .mount = nfs4_referral_mount, - .kill_sb = nfs_kill_super, - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, -}; static const struct super_operations nfs4_sops = { .alloc_inode = nfs_alloc_inode, @@ -41,7 +32,6 @@ static const struct super_operations nfs4_sops = { .show_devname = nfs_show_devname, .show_path = nfs_show_path, .show_stats = nfs_show_stats, - .remount_fs = nfs_remount, }; struct nfs_subversion nfs_v4 = { @@ -147,102 +137,121 @@ static void nfs_referral_loop_unprotect(void) kfree(p); } -static struct dentry *do_nfs4_mount(struct nfs_server *server, int flags, - struct nfs_mount_info *info, - const char *hostname, - const char *export_path) +static int do_nfs4_mount(struct nfs_server *server, + struct fs_context *fc, + const char *hostname, + const char *export_path) { + struct nfs_fs_context *root_ctx; + struct fs_context *root_fc; struct vfsmount *root_mnt; struct dentry *dentry; - char *root_devname; - int err; size_t len; + int ret; + + struct fs_parameter param = { + .key = "source", + .type = fs_value_is_string, + .dirfd = -1, + }; if (IS_ERR(server)) - return ERR_CAST(server); + return PTR_ERR(server); - len = strlen(hostname) + 5; - root_devname = kmalloc(len, GFP_KERNEL); - if (root_devname == NULL) { + root_fc = vfs_dup_fs_context(fc); + if (IS_ERR(root_fc)) { nfs_free_server(server); - return ERR_PTR(-ENOMEM); + return PTR_ERR(root_fc); + } + kfree(root_fc->source); + root_fc->source = NULL; + + root_ctx = nfs_fc2context(root_fc); + root_ctx->internal = true; + root_ctx->mount_info.server = server; + /* We leave export_path unset as it's not used to find the root. */ + + len = strlen(hostname) + 5; + param.string = kmalloc(len, GFP_KERNEL); + if (param.string == NULL) { + put_fs_context(root_fc); + return -ENOMEM; } /* Does hostname needs to be enclosed in brackets? */ if (strchr(hostname, ':')) - snprintf(root_devname, len, "[%s]:/", hostname); + param.size = snprintf(param.string, len, "[%s]:/", hostname); else - snprintf(root_devname, len, "%s:/", hostname); - info->server = server; - root_mnt = vfs_kern_mount(&nfs_prepared_fs_type, flags, root_devname, info); - if (info->server) - nfs_free_server(info->server); - info->server = NULL; - kfree(root_devname); + param.size = snprintf(param.string, len, "%s:/", hostname); + ret = vfs_parse_fs_param(root_fc, ¶m); + kfree(param.string); + if (ret < 0) { + put_fs_context(root_fc); + return ret; + } + root_mnt = fc_mount(root_fc); + put_fs_context(root_fc); if (IS_ERR(root_mnt)) - return ERR_CAST(root_mnt); + return PTR_ERR(root_mnt); - err = nfs_referral_loop_protect(); - if (err) { + ret = nfs_referral_loop_protect(); + if (ret) { mntput(root_mnt); - return ERR_PTR(err); + return ret; } dentry = mount_subtree(root_mnt, export_path); nfs_referral_loop_unprotect(); - return dentry; + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + + fc->root = dentry; + return 0; } -struct dentry *nfs4_try_mount(int flags, const char *dev_name, - struct nfs_mount_info *mount_info) +int nfs4_try_get_tree(struct fs_context *fc) { - struct nfs_fs_context *ctx = mount_info->ctx; - struct dentry *res; - - dfprintk(MOUNT, "--> nfs4_try_mount()\n"); + struct nfs_fs_context *ctx = nfs_fc2context(fc); + int err; - res = do_nfs4_mount(nfs4_create_server(mount_info), - flags, mount_info, - ctx->nfs_server.hostname, - ctx->nfs_server.export_path); + dfprintk(MOUNT, "--> nfs4_try_get_tree()\n"); - dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", - PTR_ERR_OR_ZERO(res), - IS_ERR(res) ? " [error]" : ""); - return res; + /* We create a mount for the server's root, walk to the requested + * location and then create another mount for that. + */ + err= do_nfs4_mount(nfs4_create_server(&ctx->mount_info), + fc, ctx->nfs_server.hostname, + ctx->nfs_server.export_path); + if (err) { + dfprintk(MOUNT, "<-- nfs4_try_get_tree() = %d [error]\n", err); + } else { + dfprintk(MOUNT, "<-- nfs4_try_get_tree() = 0\n"); + } + return err; } /* * Create an NFS4 server record on referral traversal */ -static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data) +int nfs4_get_referral_tree(struct fs_context *fc) { - struct nfs_clone_mount *data = raw_data; - struct nfs_mount_info mount_info = { - .cloned = data, - .nfs_mod = &nfs_v4, - }; - struct dentry *res; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + int err; dprintk("--> nfs4_referral_mount()\n"); - mount_info.mntfh = nfs_alloc_fhandle(); - if (!mount_info.mntfh) - return ERR_PTR(-ENOMEM); - - res = do_nfs4_mount(nfs4_create_referral_server(mount_info.cloned, - mount_info.mntfh), - flags, &mount_info, data->hostname, data->mnt_path); - - dprintk("<-- nfs4_referral_mount() = %d%s\n", - PTR_ERR_OR_ZERO(res), - IS_ERR(res) ? " [error]" : ""); - - nfs_free_fhandle(mount_info.mntfh); - return res; + /* create a new volume representation */ + err = do_nfs4_mount(nfs4_create_referral_server(&ctx->clone_data, ctx->mount_info.mntfh), + fc, ctx->nfs_server.hostname, + ctx->nfs_server.export_path); + if (err) { + dfprintk(MOUNT, "<-- nfs4_get_referral_tree() = %d [error]\n", err); + } else { + dfprintk(MOUNT, "<-- nfs4_get_referral_tree() = 0\n"); + } + return err; } diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c index 0f7288b94633..44a15523bf40 100644 --- a/fs/nfs/proc.c +++ b/fs/nfs/proc.c @@ -710,7 +710,7 @@ const struct nfs_rpc_ops nfs_v2_clientops = { .file_ops = &nfs_file_operations, .getroot = nfs_proc_get_root, .submount = nfs_submount, - .try_mount = nfs_try_mount, + .try_get_tree = nfs_try_get_tree, .getattr = nfs_proc_getattr, .setattr = nfs_proc_setattr, .lookup = nfs_proc_lookup, diff --git a/fs/nfs/super.c b/fs/nfs/super.c index bb51618df142..6ff99da978a8 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -70,28 +70,6 @@ #define NFSDBG_FACILITY NFSDBG_VFS -static struct dentry *nfs_prepared_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data); - -struct file_system_type nfs_fs_type = { - .owner = THIS_MODULE, - .name = "nfs", - .mount = nfs_fs_mount, - .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); - -struct file_system_type nfs_prepared_fs_type = { - .owner = THIS_MODULE, - .name = "nfs", - .mount = nfs_prepared_mount, - .kill_sb = nfs_kill_super, - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, -}; -EXPORT_SYMBOL_GPL(nfs_prepared_fs_type); - const struct super_operations nfs_sops = { .alloc_inode = nfs_alloc_inode, .free_inode = nfs_free_inode, @@ -104,22 +82,10 @@ const struct super_operations nfs_sops = { .show_devname = nfs_show_devname, .show_path = nfs_show_path, .show_stats = nfs_show_stats, - .remount_fs = nfs_remount, }; EXPORT_SYMBOL_GPL(nfs_sops); #if IS_ENABLED(CONFIG_NFS_V4) -struct file_system_type nfs4_fs_type = { - .owner = THIS_MODULE, - .name = "nfs4", - .mount = nfs_fs_mount, - .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); - static int __init register_nfs4_fs(void) { return register_filesystem(&nfs4_fs_type); @@ -911,20 +877,19 @@ static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_inf return nfs_mod->rpc_ops->create_server(mount_info); } -static struct dentry *nfs_fs_mount_common(int, const char *, struct nfs_mount_info *); - -struct dentry *nfs_try_mount(int flags, const char *dev_name, - struct nfs_mount_info *mount_info) +int nfs_try_get_tree(struct fs_context *fc) { - struct nfs_subversion *nfs_mod = mount_info->nfs_mod; - if (mount_info->ctx->need_mount) - mount_info->server = nfs_try_mount_request(mount_info); + struct nfs_fs_context *ctx = nfs_fc2context(fc); + + if (ctx->need_mount) + ctx->mount_info.server = nfs_try_mount_request(&ctx->mount_info); else - mount_info->server = nfs_mod->rpc_ops->create_server(mount_info); + ctx->mount_info.server = ctx->mount_info.nfs_mod->rpc_ops->create_server(&ctx->mount_info); - return nfs_fs_mount_common(flags, dev_name, mount_info); + return nfs_get_tree_common(fc); } -EXPORT_SYMBOL_GPL(nfs_try_mount); +EXPORT_SYMBOL_GPL(nfs_try_get_tree); + #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ | NFS_MOUNT_SECURE \ @@ -965,15 +930,11 @@ nfs_compare_remount_data(struct nfs_server *nfss, return 0; } -int -nfs_remount(struct super_block *sb, int *flags, char *raw_data) +int nfs_reconfigure(struct fs_context *fc) { - int error; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct super_block *sb = fc->root->d_sb; struct nfs_server *nfss = sb->s_fs_info; - struct nfs_fs_context *ctx; - struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; - struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; - u32 nfsvers = nfss->nfs_client->rpc_ops->version; sync_filesystem(sb); @@ -983,57 +944,24 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data) * ones were explicitly specified. Fall back to legacy behavior and * just return success. */ - if ((nfsvers == 4 && (!options4 || options4->version == 1)) || - (nfsvers <= 3 && (!options || (options->version >= 1 && - options->version <= 6)))) + if (ctx->skip_reconfig_option_check) return 0; - ctx = nfs_alloc_parsed_mount_data(); - if (ctx == NULL) - return -ENOMEM; - - /* fill out struct with values from existing mount */ - 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 = nfsvers; - ctx->minorversion = nfss->nfs_client->cl_minorversion; - ctx->net = current->nsproxy->net_ns; - memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr, - ctx->nfs_server.addrlen); - - /* overwrite those values with any that were specified */ - error = -EINVAL; - if (!nfs_parse_mount_options((char *)options, ctx)) - goto out; - /* * noac is a special case. It implies -o sync, but that's not - * necessarily reflected in the mtab options. do_remount_sb + * necessarily reflected in the mtab options. reconfigure_super * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the * remount options, so we have to explicitly reset it. */ - if (ctx->flags & NFS_MOUNT_NOAC) - *flags |= SB_SYNCHRONOUS; + if (ctx->flags & NFS_MOUNT_NOAC) { + fc->sb_flags |= SB_SYNCHRONOUS; + fc->sb_flags_mask |= SB_SYNCHRONOUS; + } /* compare new mount options with old ones */ - error = nfs_compare_remount_data(nfss, ctx); - if (!error) - error = security_sb_remount(sb, ctx->lsm_opts); -out: - nfs_free_parsed_mount_data(ctx); - return error; + return nfs_compare_remount_data(nfss, ctx); } -EXPORT_SYMBOL_GPL(nfs_remount); +EXPORT_SYMBOL_GPL(nfs_reconfigure); /* * Finish setting up an NFS superblock @@ -1112,19 +1040,11 @@ static int nfs_compare_mount_options(const struct super_block *s, const struct n return 0; } -struct nfs_sb_mountdata { - struct nfs_server *server; - int mntflags; -}; - -static int nfs_set_super(struct super_block *s, void *data) +static int nfs_set_super(struct super_block *s, struct fs_context *fc) { - struct nfs_sb_mountdata *sb_mntdata = data; - struct nfs_server *server = sb_mntdata->server; + struct nfs_server *server = fc->s_fs_info; int ret; - s->s_flags = sb_mntdata->mntflags; - s->s_fs_info = server; s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; ret = set_anon_super(s, server); if (ret == 0) @@ -1189,11 +1109,9 @@ static int nfs_compare_userns(const struct nfs_server *old, return 1; } -static int nfs_compare_super(struct super_block *sb, void *data) +static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) { - struct nfs_sb_mountdata *sb_mntdata = data; - struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); - int mntflags = sb_mntdata->mntflags; + struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); if (!nfs_compare_super_address(old, server)) return 0; @@ -1204,13 +1122,12 @@ static int nfs_compare_super(struct super_block *sb, void *data) return 0; if (!nfs_compare_userns(old, server)) return 0; - return nfs_compare_mount_options(sb, server, mntflags); + return nfs_compare_mount_options(sb, server, fc->sb_flags); } #ifdef CONFIG_NFS_FSCACHE static void nfs_get_cache_cookie(struct super_block *sb, - struct nfs_fs_context *ctx, - struct nfs_clone_mount *cloned) + struct nfs_fs_context *ctx) { struct nfs_server *nfss = NFS_SB(sb); char *uniq = NULL; @@ -1219,30 +1136,32 @@ static void nfs_get_cache_cookie(struct super_block *sb, nfss->fscache_key = NULL; nfss->fscache = NULL; - if (ctx) { + if (!ctx) + return; + + if (ctx->clone_data.sb) { + struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb); + if (!(mnt_s->options & NFS_OPTION_FSCACHE)) + return; + if (mnt_s->fscache_key) { + uniq = mnt_s->fscache_key->key.uniquifier; + ulen = mnt_s->fscache_key->key.uniq_len; + } + } else { if (!(ctx->options & NFS_OPTION_FSCACHE)) return; if (ctx->fscache_uniq) { uniq = ctx->fscache_uniq; ulen = strlen(ctx->fscache_uniq); } - } else if (cloned) { - struct nfs_server *mnt_s = NFS_SB(cloned->sb); - if (!(mnt_s->options & NFS_OPTION_FSCACHE)) - return; - if (mnt_s->fscache_key) { - uniq = mnt_s->fscache_key->key.uniquifier; - ulen = mnt_s->fscache_key->key.uniq_len; - }; - } else return; + } nfs_fscache_get_super_cookie(sb, uniq, ulen); } #else static void nfs_get_cache_cookie(struct super_block *sb, - struct nfs_fs_context *parsed, - struct nfs_clone_mount *cloned) + struct nfs_fs_context *ctx) { } #endif @@ -1254,40 +1173,41 @@ static void nfs_set_readahead(struct backing_dev_info *bdi, bdi->io_pages = iomax_pages; } -static struct dentry *nfs_fs_mount_common(int flags, const char *dev_name, - struct nfs_mount_info *mount_info) +int nfs_get_tree_common(struct fs_context *fc) { + struct nfs_fs_context *ctx = nfs_fc2context(fc); struct super_block *s; struct dentry *mntroot = ERR_PTR(-ENOMEM); - int (*compare_super)(struct super_block *, void *) = nfs_compare_super; - struct nfs_server *server = mount_info->server; + int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; + struct nfs_server *server = ctx->mount_info.server; unsigned long kflags = 0, kflags_out = 0; - struct nfs_sb_mountdata sb_mntdata = { - .mntflags = flags, - .server = server, - }; int error; - mount_info->server = NULL; + ctx->mount_info.server = NULL; if (IS_ERR(server)) - return ERR_CAST(server); + return PTR_ERR(server); if (server->flags & NFS_MOUNT_UNSHARED) compare_super = NULL; /* -o noac implies -o sync */ if (server->flags & NFS_MOUNT_NOAC) - sb_mntdata.mntflags |= SB_SYNCHRONOUS; + fc->sb_flags |= SB_SYNCHRONOUS; + + if (ctx->clone_data.sb) + if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) + fc->sb_flags |= SB_SYNCHRONOUS; - if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) - if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS) - sb_mntdata.mntflags |= SB_SYNCHRONOUS; + if (server->caps & NFS_CAP_SECURITY_LABEL) + fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS; /* Get a superblock - note that we may end up sharing one that already exists */ - s = sget(mount_info->nfs_mod->nfs_fs, compare_super, nfs_set_super, - flags, &sb_mntdata); + fc->s_fs_info = server; + s = sget_fc(fc, compare_super, nfs_set_super); + fc->s_fs_info = NULL; if (IS_ERR(s)) { - mntroot = ERR_CAST(s); + error = PTR_ERR(s); + dfprintk(MOUNT, "NFS: Couldn't get superblock\n"); goto out_err_nosb; } @@ -1297,44 +1217,43 @@ static struct dentry *nfs_fs_mount_common(int flags, const char *dev_name, } else { error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), MINOR(server->s_dev)); - if (error) { - mntroot = ERR_PTR(error); + if (error) goto error_splat_super; - } nfs_set_readahead(s->s_bdi, server->rpages); server->super = s; } if (!s->s_root) { - unsigned bsize = mount_info->inherited_bsize; + unsigned bsize = ctx->mount_info.inherited_bsize; /* initial superblock/root creation */ - nfs_fill_super(s, mount_info); + nfs_fill_super(s, &ctx->mount_info); if (bsize) { s->s_blocksize_bits = bsize; s->s_blocksize = 1U << bsize; } - nfs_get_cache_cookie(s, mount_info->ctx, mount_info->cloned); - if (!(server->flags & NFS_MOUNT_UNSHARED)) - s->s_iflags |= SB_I_MULTIROOT; + nfs_get_cache_cookie(s, ctx); } - mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); - if (IS_ERR(mntroot)) + mntroot = nfs_get_root(s, ctx->mount_info.mntfh, fc->source); + if (IS_ERR(mntroot)) { + error = PTR_ERR(mntroot); + dfprintk(MOUNT, "NFS: Couldn't get root dentry\n"); goto error_splat_super; - + } + fc->root = mntroot; if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) kflags |= SECURITY_LSM_NATIVE_LABELS; - if (mount_info->cloned) { - if (d_inode(mntroot)->i_fop != &nfs_dir_operations) { + if (ctx->clone_data.sb) { + if (d_inode(fc->root)->i_fop != &nfs_dir_operations) { error = -ESTALE; goto error_splat_root; } /* clone any lsm security options from the parent to the new sb */ - error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags, + error = security_sb_clone_mnt_opts(ctx->clone_data.sb, s, kflags, &kflags_out); } else { - error = security_sb_set_mnt_opts(s, mount_info->ctx->lsm_opts, + error = security_sb_set_mnt_opts(s, fc->security, kflags, &kflags_out); } if (error) @@ -1342,67 +1261,25 @@ static struct dentry *nfs_fs_mount_common(int flags, const char *dev_name, if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; - if (error) - goto error_splat_root; s->s_flags |= SB_ACTIVE; + error = 0; out: - return mntroot; + return error; out_err_nosb: nfs_free_server(server); goto out; error_splat_root: - dput(mntroot); - mntroot = ERR_PTR(error); + dput(fc->root); + fc->root = NULL; error_splat_super: deactivate_locked_super(s); goto out; } -struct dentry *nfs_fs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data) -{ - struct nfs_mount_info mount_info = { - }; - struct dentry *mntroot = ERR_PTR(-ENOMEM); - struct nfs_subversion *nfs_mod; - int error; - - mount_info.ctx = nfs_alloc_parsed_mount_data(); - mount_info.mntfh = nfs_alloc_fhandle(); - if (mount_info.ctx == NULL || mount_info.mntfh == NULL) - goto out; - - /* Validate the mount data */ - error = nfs_validate_mount_data(fs_type, raw_data, mount_info.ctx, mount_info.mntfh, dev_name); - if (error == NFS_TEXT_DATA) - error = nfs_validate_text_mount_data(raw_data, - mount_info.ctx, dev_name); - if (error < 0) { - mntroot = ERR_PTR(error); - goto out; - } - - nfs_mod = get_nfs_version(mount_info.ctx->version); - if (IS_ERR(nfs_mod)) { - mntroot = ERR_CAST(nfs_mod); - goto out; - } - mount_info.nfs_mod = nfs_mod; - - mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info); - - put_nfs_version(nfs_mod); -out: - nfs_free_parsed_mount_data(mount_info.ctx); - nfs_free_fhandle(mount_info.mntfh); - return mntroot; -} -EXPORT_SYMBOL_GPL(nfs_fs_mount); - /* * Destroy an NFS2/3 superblock */ @@ -1420,17 +1297,6 @@ void nfs_kill_super(struct super_block *s) } EXPORT_SYMBOL_GPL(nfs_kill_super); -/* - * Internal use only: mount_info is already set up by caller. - * Used for mountpoint crossings and for nfs4 root. - */ -static struct dentry * -nfs_prepared_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *raw_data) -{ - return nfs_fs_mount_common(flags, dev_name, raw_data); -} - #if IS_ENABLED(CONFIG_NFS_V4) /* diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 82bdb91da2ae..3de843888bc0 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -1622,6 +1622,7 @@ struct nfs_subversion; struct nfs_mount_info; struct nfs_client_initdata; struct nfs_pageio_descriptor; +struct fs_context; /* * RPC procedure vector for NFSv2/NFSv3 demuxing @@ -1636,9 +1637,8 @@ struct nfs_rpc_ops { int (*getroot) (struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); - struct vfsmount *(*submount) (struct nfs_server *, struct dentry *, - struct nfs_fh *, struct nfs_fattr *); - struct dentry *(*try_mount) (int, const char *, struct nfs_mount_info *); + int (*submount) (struct fs_context *, struct nfs_server *); + int (*try_get_tree) (struct fs_context *); int (*getattr) (struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *, struct inode *);