On Tue, Jan 07, 2014 at 08:55:12PM +0100, Sander Klein wrote:
> Hi,
>
> Thank you very much for this patch. I've added the ZFS magic and
> tested it on my nfs-utils-1.2.8 package and it looks like it fixes
> my issue.
>
> Is there any chance this patch will be accepted upstream with the
> ZFS_SUPER_MAGIC as shown below?
OK by me; cc'ing steved.
--b.
>
> Greets,
>
> Sander
>
> From e4f5b38c87ef8d713c6d0a3169afaf1acc7e22c6 Mon Sep 17 00:00:00 2001
> From: Karel Zak <kzak@xxxxxxxxxx>
> Date: Mon, 6 Jan 2014 12:03:01 +0100
> Subject: [PATCH] mountd: optimize libblkid usage
>
> * use get_uuid_blkdev() only first time for the path (it means
> that uuid_by_path() is called with type==0)
>
> * don't use libblkid for btrfs, network or pseudo filesystems
>
> Note that the patch defines the fs type ID rather than include
> <linux/magic.h> as this file seems incomplete and libc specific).
>
> Signed-off-by: Karel Zak <kzak@xxxxxxxxxx>
> ---
> utils/mountd/cache.c | 38 +++++++++++++++++++++++++++++++++++---
> 1 file changed, 35 insertions(+), 3 deletions(-)
>
> Index: nfs-utils-1.2.8/utils/mountd/cache.c
> ===================================================================
> --- nfs-utils-1.2.8.orig/utils/mountd/cache.c 2013-05-02
> 14:21:12.000000000 +0200
> +++ nfs-utils-1.2.8/utils/mountd/cache.c 2014-01-07
> 20:46:55.799904557 +0100
> @@ -266,6 +266,27 @@
> return 1;
> }
>
> +
> +/*
> + * Don't ask libblkid for these filesystems. Note that BTRF is
> ignored, because
> + * we generate the identifier from statfs->f_fsid. The rest are
> network or
> + * pseudo filesystems. (See <linux/magic.h> for the basic IDs.)
> + */
> +static const long int nonblkid_filesystems[] = {
> + 0x2fc12fc1, /* ZFS_SUPER_MAGIC */
> + 0x9123683E, /* BTRFS_SUPER_MAGIC */
> + 0xFF534D42, /* CIFS_MAGIC_NUMBER */
> + 0x1373, /* DEVFS_SUPER_MAGIC */
> + 0x73757245, /* CODA_SUPER_MAGIC */
> + 0x564C, /* NCP_SUPER_MAGIC */
> + 0x6969, /* NFS_SUPER_MAGIC */
> + 0x9FA0, /* PROC_SUPER_MAGIC */
> + 0x62656572, /* SYSFS_MAGIC */
> + 0x517B, /* SMB_SUPER_MAGIC */
> + 0x01021994, /* TMPFS_SUPER_MAGIC */
> + 0 /* last */
> +};
> +
> static int uuid_by_path(char *path, int type, size_t uuidlen, char
> *uuid)
> {
> /* get a uuid for the filesystem found at 'path'.
> @@ -297,12 +318,24 @@
> */
> struct statfs64 st;
> char fsid_val[17];
> - const char *blkid_val;
> + const char *blkid_val = NULL;
> const char *val;
> + int rc;
> +
> + rc = statfs64(path, &st);
> +
> + if (type == 0 && rc == 0) {
> + const long int *bad;
>
> - blkid_val = get_uuid_blkdev(path);
> + for (bad = nonblkid_filesystems; *bad; bad++) {
> + if (*bad == st.f_type)
> + break;
> + }
> + if (*bad == 0)
> + blkid_val = get_uuid_blkdev(path);
> + }
>
> - if (statfs64(path, &st) == 0 &&
> + if (rc == 0 &&
> (st.f_fsid.__val[0] || st.f_fsid.__val[1]))
> snprintf(fsid_val, 17, "%08x%08x",
> st.f_fsid.__val[0], st.f_fsid.__val[1]);
>
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