All of lore.kernel.org
 help / color / mirror / Atom feed
From: David Howells <dhowells@redhat.com>
To: arnd@arndb.de
Cc: linux-afs@vger.kernel.org, linux-nfs@vger.kernel.org,
	linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
	linux-kernel@vger.kernel.org, dhowells@redhat.com,
	linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: [PATCH 11/12] fsinfo: NFS: Return information through the filesystem info syscall
Date: Fri, 20 Nov 2015 14:56:39 +0000	[thread overview]
Message-ID: <20151120145639.18930.13368.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <20151120145422.18930.72662.stgit@warthog.procyon.org.uk>

Return NFS filesystem information through the filesystem info retrieval
system call.  This includes the following:

 (1) information about the capacity and resolution of the inode timestamps;

 (2) the client hostname as the domain name, setting FSINFO_DOMAIN_NAME;

 (3) the remote FSID as the volume ID, setting FSINFO_VOLUME_ID;

and unless AT_NO_ATTR_SYNC is specified:

 (4) the statfs information retrieved from the server.

Note that the NFS FSID value is *not* returned as the local FSID since the
FSID value is a local handle used by NFSD; see the volume ID field instead.

Example output:

	[root@andromeda ~]# ./test-fsinfo /warthog/
	fsinfo(/warthog/) = 0
	mask  : 12f
	dev   : 00:27
	fs    : type=6969 name=nfs4
	ioc   : 0
	nameln: 255
	flags : 1020
	times : range=8000000000000000-7fffffffffffffff
	atime : gran=1e-09s
	btime : gran=1e-09s
	ctime : gran=1e-09s
	mtime : gran=1e-09s
	blocks: n=503841 fr=48261 av=22645
	files : n=32776192 fr=18903243 av=18903243
	bsize : 1048576
	frsize: 0
	volid : 8c494c34 de5688ac 2e61e05d 5f144b8e
	domain: 'warthog'

Note that NFS4 potentially provides a separate value for f_favail that could
be provided through this interface.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 fs/nfs/internal.h  |    1 +
 fs/nfs/nfs4super.c |    1 +
 fs/nfs/super.c     |   58 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+)

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 56cfde26fb9c..6c7bb9c9e5c6 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -442,6 +442,7 @@ extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
 void nfs_umount_begin(struct super_block *);
 int  nfs_statfs(struct dentry *, struct kstatfs *);
+int  nfs_get_fsinfo(struct dentry *, struct fsinfo *, unsigned);
 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 *);
diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c
index 6fb7cb6b3f4b..1c15c5884ac4 100644
--- a/fs/nfs/nfs4super.c
+++ b/fs/nfs/nfs4super.c
@@ -54,6 +54,7 @@ static const struct super_operations nfs4_sops = {
 	.write_inode	= nfs4_write_inode,
 	.drop_inode	= nfs_drop_inode,
 	.statfs		= nfs_statfs,
+	.get_fsinfo	= nfs_get_fsinfo,
 	.evict_inode	= nfs4_evict_inode,
 	.umount_begin	= nfs_umount_begin,
 	.show_options	= nfs_show_options,
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 383a027de452..bbd33b121b48 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -311,6 +311,7 @@ const struct super_operations nfs_sops = {
 	.write_inode	= nfs_write_inode,
 	.drop_inode	= nfs_drop_inode,
 	.statfs		= nfs_statfs,
+	.get_fsinfo	= nfs_get_fsinfo,
 	.evict_inode	= nfs_evict_inode,
 	.umount_begin	= nfs_umount_begin,
 	.show_options	= nfs_show_options,
@@ -494,6 +495,63 @@ int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 EXPORT_SYMBOL_GPL(nfs_statfs);
 
 /*
+ * Read filesystem information.
+ */
+int nfs_get_fsinfo(struct dentry *dentry, struct fsinfo *f, unsigned flags)
+{
+	struct nfs_server *server = NFS_SB(dentry->d_sb);
+	struct nfs_client *client = server->nfs_client;
+	int ret;
+
+	f->f_bsize	= dentry->d_sb->s_blocksize;
+	f->f_namelen	= server->namelen;
+
+	if (client->rpc_ops->version < 4) {
+		f->f_min_time = 0;
+		f->f_max_time = U32_MAX;
+	} else {
+		f->f_min_time = S64_MIN;
+		f->f_max_time = S64_MAX;
+	}
+
+	f->f_atime_gran_exponent = -6;
+	f->f_ctime_gran_exponent = -6;
+	f->f_mtime_gran_exponent = -6;
+	if (client->rpc_ops->version >= 3) {
+		f->f_atime_gran_exponent = -9;
+		f->f_ctime_gran_exponent = -9;
+		f->f_mtime_gran_exponent = -9;
+	}
+
+	if (client->cl_hostname) {
+		strncpy(f->f_domain_name, client->cl_hostname,
+			sizeof(f->f_domain_name));
+		f->f_domain_name[sizeof(f->f_domain_name) - 1] = 0;
+		f->f_mask |= FSINFO_DOMAIN_NAME;
+	}
+
+	/* Treat the remote FSID as the volume ID since we don't support
+	 * reexportation through NFSD.
+	 */
+	memcpy(f->f_volume_id, &server->fsid,
+	       min(sizeof(f->f_volume_id), sizeof(server->fsid)));
+	f->f_mask |= FSINFO_VOLUME_ID;
+	
+	if (flags & AT_NO_ATTR_SYNC)
+		return 0;
+
+	ret = vfs_get_fsinfo_from_statfs(dentry, f, flags);
+	if (ret < 0)
+		return ret;
+
+	/* Don't pass the FSID to userspace since this isn't exportable */
+	memset(&f->f_fsid, 0, sizeof(f->f_fsid));
+	f->f_mask &= ~FSINFO_FSID;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nfs_get_fsinfo);
+
+/*
  * Map the security flavour number to a name
  */
 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)


  parent reply	other threads:[~2015-11-20 14:56 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-20 14:54 [RFC][PATCH 00/12] Enhanced file stat system call David Howells
2015-11-20 14:54 ` [PATCH 01/12] Ext4: Fix extended timestamp encoding and decoding David Howells
     [not found]   ` <20151120145434.18930.89755.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-24 17:37     ` Andreas Dilger
2015-11-24 17:37       ` Andreas Dilger
2015-11-24 19:36   ` Theodore Ts'o
     [not found]     ` <20151124193646.GA3482-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-11-24 20:10       ` Arnd Bergmann
2015-11-24 20:10         ` Arnd Bergmann
2015-11-29  2:45         ` Theodore Ts'o
2015-11-29  2:45           ` Theodore Ts'o
     [not found]           ` <20151129024555.GA31968-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-11-29 21:30             ` Arnd Bergmann
2015-11-29 21:30               ` Arnd Bergmann
2015-11-30 14:16               ` Theodore Ts'o
     [not found]                 ` <20151130141605.GA4316-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-11-30 14:37                   ` Arnd Bergmann
2015-11-30 14:37                     ` Arnd Bergmann
2015-11-30 14:46                 ` Elmar Stellnberger
2015-11-26 15:28       ` David Howells
2015-11-26 15:28         ` David Howells
2015-11-20 14:54 ` [PATCH 02/12] statx: Provide IOC flags for Windows fs attributes David Howells
     [not found]   ` <20151120145447.18930.5308.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-24 19:52     ` Theodore Ts'o
2015-11-24 19:52       ` Theodore Ts'o
2015-11-26 15:35   ` David Howells
     [not found]   ` <7976.1448552129-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-26 16:01     ` David Howells
2015-11-26 16:01       ` David Howells
2015-11-26 22:10     ` Andreas Dilger
2015-11-26 22:10       ` Andreas Dilger
2015-11-20 14:54 ` [PATCH 03/12] statx: Add a system call to make enhanced file info available David Howells
     [not found]   ` <20151120145457.18930.79678.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-24 20:21     ` Dave Chinner
2015-11-24 20:21       ` Dave Chinner
2015-12-04 12:06     ` Pavel Machek
2015-12-04 12:06       ` Pavel Machek
2015-12-21 23:21   ` David Howells
2015-11-20 14:55 ` [PATCH 04/12] statx: AFS: Return enhanced file attributes David Howells
2015-11-20 14:55 ` [PATCH 05/12] statx: Ext4: " David Howells
2015-11-20 14:55 ` [PATCH 06/12] statx: NFS: " David Howells
2015-11-20 14:55 ` [PATCH 07/12] statx: CIFS: Return enhanced attributes David Howells
2015-11-24 17:33   ` Steve French
2015-11-24 17:34   ` Steve French
2015-11-24 17:34     ` Steve French
2015-11-20 14:56 ` [PATCH 08/12] fsinfo: Add a system call to make enhanced filesystem info available David Howells
2015-11-20 14:56 ` [PATCH 09/12] fsinfo: Ext4: Return information through the filesystem info syscall David Howells
2015-11-20 14:56 ` [PATCH 10/12] fsinfo: AFS: " David Howells
2015-11-20 14:56 ` David Howells [this message]
     [not found] ` <20151120145422.18930.72662.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-20 14:56   ` [PATCH 12/12] fsinfo: CIFS: " David Howells
2015-11-20 14:56     ` David Howells
2015-11-24  8:11   ` [RFC][PATCH 00/12] Enhanced file stat system call Christoph Hellwig
2015-11-24  8:11     ` Christoph Hellwig
2015-11-20 16:19 ` Martin Steigerwald
2015-11-24  8:13   ` Christoph Hellwig
2015-11-24  8:48     ` Martin Steigerwald
2015-11-24  8:50       ` Christoph Hellwig
2015-11-20 16:28 ` David Howells
2015-11-20 16:28   ` David Howells
2015-11-20 16:35   ` Martin Steigerwald
     [not found]   ` <4495.1448036915-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-25 17:51     ` J. Bruce Fields
2015-11-25 17:51       ` J. Bruce Fields
     [not found]       ` <20151125175153.GA30335-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2015-11-25 19:30         ` Andreas Dilger
2015-11-25 19:30           ` Andreas Dilger
2015-11-20 16:50 ` Casey Schaufler
     [not found]   ` <564F4F4E.8060603-iSGtlc1asvQWG2LlvL+J4A@public.gmane.org>
2015-11-24  8:15     ` Christoph Hellwig
2015-11-24  8:15       ` Christoph Hellwig
2015-11-24 14:43       ` Casey Schaufler
2015-11-24 16:28   ` Andreas Dilger
2015-11-26 15:19 ` David Howells
2015-11-26 22:06   ` Andreas Dilger

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20151120145639.18930.13368.stgit@warthog.procyon.org.uk \
    --to=dhowells@redhat.com \
    --cc=arnd@arndb.de \
    --cc=linux-afs@vger.kernel.org \
    --cc=linux-cifs@vger.kernel.org \
    --cc=linux-ext4@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nfs@vger.kernel.org \
    --cc=samba-technical@lists.samba.org \
    --subject='Re: [PATCH 11/12] fsinfo: NFS: Return information through the filesystem info syscall' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.