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From: David Howells <dhowells@redhat.com>
To: trond.myklebust@hammerspace.com, anna.schumaker@netapp.com
Cc: Al Viro <viro@zeniv.linux.org.uk>,
	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 03/23] nfs: lift setting mount_info from nfs4_remote{, _referral}_mount
Date: Thu, 23 May 2019 17:16:17 +0100	[thread overview]
Message-ID: <155862817738.26654.16583027208956953428.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <155862813755.26654.563679411147031501.stgit@warthog.procyon.org.uk>

From: Al Viro <viro@zeniv.linux.org.uk>

Do that (fhandle allocation, setting struct server up) in
nfs4_referral_mount() and nfs4_try_mount() resp. and pass the
server and pointer to mount_info into nfs_do_root_mount() so that
nfs4_remote_referral_mount()/nfs_remote_mount() could be merged.

Since we are moving stuff from ->mount() instances to the points
prior to vfs_kern_mount() that would trigger those, we need to
make sure that do_nfs_root_mount() will do the corresponding
cleanup itself if it doesn't trigger those ->mount() instances.

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

 fs/nfs/nfs4super.c |   67 +++++++++++++++++++++++++++-------------------------
 1 file changed, 35 insertions(+), 32 deletions(-)

diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c
index a962042972fa..71a970ca3fb7 100644
--- a/fs/nfs/nfs4super.c
+++ b/fs/nfs/nfs4super.c
@@ -107,32 +107,37 @@ static struct dentry *
 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
 		  const char *dev_name, void *info)
 {
-	struct nfs_mount_info *mount_info = info;
-
-	mount_info->set_security = nfs_set_sb_security;
-
-	/* Get a volume representation */
-	mount_info->server = nfs4_create_server(mount_info, &nfs_v4);
-	return nfs_fs_mount_common(flags, dev_name, mount_info, &nfs_v4);
+	return nfs_fs_mount_common(flags, dev_name, info, &nfs_v4);
 }
 
 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
-		int flags, void *data, const char *hostname)
+					  struct nfs_server *server, int flags,
+					  struct nfs_mount_info *info,
+					  const char *hostname)
 {
 	struct vfsmount *root_mnt;
 	char *root_devname;
 	size_t len;
 
+	if (IS_ERR(server))
+		return ERR_CAST(server);
+
 	len = strlen(hostname) + 5;
 	root_devname = kmalloc(len, GFP_KERNEL);
-	if (root_devname == NULL)
+	if (root_devname == NULL) {
+		nfs_free_server(server);
 		return ERR_PTR(-ENOMEM);
+	}
 	/* Does hostname needs to be enclosed in brackets? */
 	if (strchr(hostname, ':'))
 		snprintf(root_devname, len, "[%s]:/", hostname);
 	else
 		snprintf(root_devname, len, "%s:/", hostname);
-	root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
+	info->server = server;
+	root_mnt = vfs_kern_mount(fs_type, flags, root_devname, info);
+	if (info->server)
+		nfs_free_server(info->server);
+	info->server = NULL;
 	kfree(root_devname);
 	return root_mnt;
 }
@@ -233,11 +238,15 @@ struct dentry *nfs4_try_mount(int flags, const char *dev_name,
 	struct dentry *res;
 	struct nfs_parsed_mount_data *data = mount_info->parsed;
 
+	mount_info->set_security = nfs_set_sb_security;
+
 	dfprintk(MOUNT, "--> nfs4_try_mount()\n");
 
 	export_path = data->nfs_server.export_path;
 	data->nfs_server.export_path = "/";
-	root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info,
+	root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type,
+			nfs4_create_server(mount_info, &nfs_v4),
+			flags, mount_info,
 			data->nfs_server.hostname);
 	data->nfs_server.export_path = export_path;
 
@@ -253,25 +262,7 @@ static struct dentry *
 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
 			   const char *dev_name, void *raw_data)
 {
-	struct nfs_mount_info mount_info = {
-		.fill_super = nfs_fill_super,
-		.set_security = nfs_clone_sb_security,
-		.cloned = raw_data,
-	};
-	struct dentry *mntroot = ERR_PTR(-ENOMEM);
-
-	dprintk("--> nfs4_referral_get_sb()\n");
-
-	mount_info.mntfh = nfs_alloc_fhandle();
-	if (mount_info.cloned == NULL || mount_info.mntfh == NULL)
-		goto out;
-
-	/* create a new volume representation */
-	mount_info.server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh);
-	mntroot = nfs_fs_mount_common(flags, dev_name, &mount_info, &nfs_v4);
-out:
-	nfs_free_fhandle(mount_info.mntfh);
-	return mntroot;
+	return nfs_fs_mount_common(flags, dev_name, raw_data, &nfs_v4);
 }
 
 /*
@@ -281,23 +272,35 @@ static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
 		int flags, const char *dev_name, void *raw_data)
 {
 	struct nfs_clone_mount *data = raw_data;
+	struct nfs_mount_info mount_info = {
+		.fill_super = nfs_fill_super,
+		.set_security = nfs_clone_sb_security,
+		.cloned = data,
+	};
 	char *export_path;
 	struct vfsmount *root_mnt;
 	struct dentry *res;
 
 	dprintk("--> nfs4_referral_mount()\n");
 
+	mount_info.mntfh = nfs_alloc_fhandle();
+	if (!mount_info.mntfh)
+		return ERR_PTR(-ENOMEM);
+
 	export_path = data->mnt_path;
 	data->mnt_path = "/";
-
 	root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
-			flags, data, data->hostname);
+			nfs4_create_referral_server(mount_info.cloned,
+						    mount_info.mntfh),
+			flags, &mount_info, data->hostname);
 	data->mnt_path = export_path;
 
 	res = nfs_follow_remote_path(root_mnt, export_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;
 }
 


  parent reply	other threads:[~2019-05-23 16:16 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-23 16:15 [PATCH 00/23] nfs: Mount API conversion David Howells
2019-05-23 16:15 ` [PATCH 01/23] saner calling conventions for nfs_fs_mount_common() David Howells
2019-05-23 16:16 ` [PATCH 02/23] nfs: stash server into struct nfs_mount_info David Howells
2019-05-23 16:16 ` David Howells [this message]
2019-05-23 16:16 ` [PATCH 04/23] nfs: fold nfs4_remote_fs_type and nfs4_remote_referral_fs_type David Howells
2019-05-23 16:16 ` [PATCH 05/23] nfs: don't bother setting/restoring export_path around do_nfs_root_mount() David Howells
2019-05-23 16:16 ` [PATCH 06/23] nfs4: fold nfs_do_root_mount/nfs_follow_remote_path David Howells
2019-05-23 16:16 ` [PATCH 07/23] nfs: lift setting mount_info from nfs_xdev_mount() David Howells
2019-05-23 16:17 ` [PATCH 08/23] nfs: stash nfs_subversion reference into nfs_mount_info David Howells
2019-05-23 16:17 ` [PATCH 09/23] nfs: don't bother passing nfs_subversion to ->try_mount() and nfs_fs_mount_common() David Howells
2019-05-23 16:17 ` [PATCH 10/23] nfs: merge xdev and remote file_system_type David Howells
2019-05-23 16:17 ` [PATCH 11/23] nfs: unexport nfs_fs_mount_common() David Howells
2019-05-23 16:17 ` [PATCH 12/23] nfs: don't pass nfs_subversion to ->create_server() David Howells
2019-05-23 16:17 ` [PATCH 13/23] nfs: get rid of mount_info ->fill_super() David Howells
2019-05-23 16:17 ` [PATCH 14/23] nfs_clone_sb_security(): simplify the check for server bogosity David Howells
2019-05-23 16:18 ` [PATCH 15/23] nfs: get rid of ->set_security() David Howells
2019-05-23 16:18 ` [PATCH 16/23] NFS: Move mount parameterisation bits into their own file David Howells
2019-05-23 16:18 ` [PATCH 17/23] NFS: Constify mount argument match tables David Howells
2019-05-23 16:18 ` [PATCH 18/23] NFS: Rename struct nfs_parsed_mount_data to struct nfs_fs_context David Howells
2019-05-23 16:18 ` [PATCH 19/23] NFS: Split nfs_parse_mount_options() David Howells
2019-05-23 16:18 ` [PATCH 20/23] NFS: Deindent nfs_fs_context_parse_option() David Howells
2019-05-23 16:18 ` [PATCH 21/23] NFS: Add a small buffer in nfs_fs_context to avoid string dup David Howells
2019-05-23 16:18 ` [PATCH 22/23] NFS: Do some tidying of the parsing code David Howells
2019-05-23 16:19 ` [PATCH 23/23] NFS: Add fs_context support David Howells
2019-05-25 23:08   ` Al Viro
2019-05-29 21:18   ` Schumaker, Anna
2019-06-06  9:41   ` David Howells

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