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99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
/*
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* Copyright (C) 2004 Luca Berra
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "filter-md.h"
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#include "metadata.h"
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#ifdef linux
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/* Lifted from <linux/raid/md_p.h> because of difficulty including it */
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#define MD_SB_MAGIC 0xa92b4efc
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#define MD_RESERVED_BYTES (64 * 1024)
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#define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512)
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#define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) \
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- MD_RESERVED_SECTORS)
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static int _ignore_md(struct dev_filter *f, struct device *dev)
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{
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uint64_t size, sector;
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uint32_t md_magic;
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if (!dev_get_size(dev, &size)) {
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stack;
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return 0;
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}
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if (size < MD_RESERVED_SECTORS * 2)
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/*
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* We could ignore it since it is obviously too
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* small, but that's not our job.
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*/
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return 1;
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if (!dev_open(dev)) {
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stack;
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return 0;
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}
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sector = MD_NEW_SIZE_SECTORS(size);
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/* Check if it is an md component device. */
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if (dev_read(dev, sector << SECTOR_SHIFT, sizeof(uint32_t), &md_magic)) {
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if (md_magic == MD_SB_MAGIC) {
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log_debug("%s: Skipping md component device",
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dev_name(dev));
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if (!dev_close(dev))
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stack;
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return 0;
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}
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}
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if (!dev_close(dev))
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stack;
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return 1;
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}
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static void _destroy(struct dev_filter *f)
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{
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dbg_free(f);
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}
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struct dev_filter *md_filter_create(void)
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{
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struct dev_filter *f;
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if (!(f = dbg_malloc(sizeof(*f)))) {
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log_error("md filter allocation failed");
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return NULL;
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}
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f->passes_filter = _ignore_md;
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f->destroy = _destroy;
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f->private = NULL;
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return f;
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}
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#else
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struct dev_filter *md_filter_create(void)
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{
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return NULL;
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}
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#endif
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