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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 10/12] fsinfo: AFS: Return information through the filesystem info syscall
Date: Fri, 20 Nov 2015 14:56:26 +0000	[thread overview]
Message-ID: <20151120145626.18930.53321.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <20151120145422.18930.72662.stgit@warthog.procyon.org.uk>

Return AFS 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 cell name as the domain name, setting FSINFO_DOMAIN_NAME;

 (3) the volume name, setting FSINFO_VOLUME_NAME;

 (4) the volume ID plus the volume type75 as the volume ID, setting
     FSINFO_VOLUME_ID;

and unless AT_NO_ATTR_SYNC is specified:

 (5) the statfs information retrieved from the server.

Note that no FSID value is 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 /afs
	fsinfo(/afs) = 0
	mask  : 1ad
	dev   : 00:24
	fs    : type=6b414653 name=afs
	ioc   : 0
	nameln: 255
	flags : 1020
	times : range=0-ffffffff
	atime : gran=1s
	btime : gran=1s
	ctime : gran=1s
	mtime : gran=1s
	blocks: n=5000 fr=4998 av=4998
	bsize : 1024
	frsize: 1024
	volid : 20000000 00000000 00000000 00000000
	volume: 'root.afs'
	domain: 'cambridge.redhat.com'

Possibly I should indicate the length of data stored in the volid field.

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

 fs/afs/super.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/fs/afs/super.c b/fs/afs/super.c
index 1fb4a5129f7d..ca88bb43ee1a 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -37,6 +37,8 @@ static void afs_kill_super(struct super_block *sb);
 static struct inode *afs_alloc_inode(struct super_block *sb);
 static void afs_destroy_inode(struct inode *inode);
 static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
+static int afs_get_fsinfo(struct dentry *dentry, struct fsinfo *f,
+			  unsigned flags);
 
 struct file_system_type afs_fs_type = {
 	.owner		= THIS_MODULE,
@@ -49,6 +51,7 @@ MODULE_ALIAS_FS("afs");
 
 static const struct super_operations afs_super_ops = {
 	.statfs		= afs_statfs,
+	.get_fsinfo	= afs_get_fsinfo,
 	.alloc_inode	= afs_alloc_inode,
 	.drop_inode	= afs_drop_inode,
 	.destroy_inode	= afs_destroy_inode,
@@ -555,3 +558,39 @@ static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
 	return 0;
 }
+
+/*
+ * Read filesystem information.
+ */
+static int afs_get_fsinfo(struct dentry *dentry, struct fsinfo *f,
+			  unsigned flags)
+{
+	struct afs_super_info *as = dentry->d_sb->s_fs_info;
+	int ret;
+
+	f->f_bsize	= AFS_BLOCK_SIZE;
+	f->f_namelen	= AFSNAMEMAX - 1;
+	f->f_min_time	= 0;
+	f->f_max_time	= U32_MAX;
+
+	/* Construct a volume ID from the AFS volume ID and type */
+	f->f_volume_id[0] = as->volume->vid >> 24;
+	f->f_volume_id[1] = as->volume->vid >> 16;
+	f->f_volume_id[2] = as->volume->vid >> 8;
+	f->f_volume_id[3] = as->volume->vid >> 0;
+	f->f_volume_id[4] = as->volume->type;
+
+	strcpy(f->f_volume_name, as->volume->vlocation->vldb.name);
+	strcpy(f->f_domain_name, as->volume->cell->name);
+
+	f->f_mask = FSINFO_VOLUME_ID | FSINFO_VOLUME_NAME | FSINFO_DOMAIN_NAME;
+
+	if (flags & AT_NO_ATTR_SYNC)
+		return 0;
+
+	ret = vfs_get_fsinfo_from_statfs(dentry, f, flags);
+
+	/* Don't pass the FSID to userspace since this isn't exportable */
+	f->f_mask &= ~FSINFO_FSID;
+	return 0;
+}

  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 ` David Howells [this message]
2015-11-20 14:56 ` [PATCH 11/12] fsinfo: NFS: " David Howells
     [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

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