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devices: detect md ddf and imsm superblocks

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This commit is contained in:
David Teigland 2019-09-19 11:33:59 -05:00
parent 286a793c12
commit 23774f997e
1 changed files with 104 additions and 1 deletions
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105
lib/device/dev-md.c
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@ -16,6 +16,7 @@
#include "lib/misc/lib.h"
#include "lib/device/dev-type.h"
#include "lib/mm/xlate.h"
#include "lib/misc/crc.h"
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h> /* for MD detection using udev db records */
#include "lib/device/dev-ext-udev-constants.h"
@ -48,6 +49,93 @@ static int _dev_has_md_magic(struct device *dev, uint64_t sb_offset)
return 0;
}
#define IMSM_SIGNATURE "Intel Raid ISM Cfg Sig. "
#define IMSM_SIG_LEN (strlen(IMSM_SIGNATURE))
static int _dev_has_imsm_magic(struct device *dev, uint64_t devsize_sectors)
{
char imsm_signature[IMSM_SIG_LEN];
uint64_t off = (devsize_sectors * 512) - 1024;
if (!dev_read_bytes(dev, off, IMSM_SIG_LEN, imsm_signature))
return_0;
if (!memcmp(imsm_signature, IMSM_SIGNATURE, IMSM_SIG_LEN))
return 1;
return 0;
}
#define DDF_MAGIC 0xDE11DE11
struct ddf_header {
uint32_t magic;
uint32_t crc;
char guid[24];
char revision[8];
char padding[472];
};
static int _dev_has_ddf_magic(struct device *dev, uint64_t devsize_sectors)
{
struct ddf_header hdr;
uint32_t crc, our_crc;
uint64_t off;
uint64_t devsize_bytes = devsize_sectors * 512;
if (devsize_bytes < 0x30000)
return 0;
/* 512 bytes before the end of device (from libblkid) */
off = ((devsize_bytes / 0x200) - 1) * 0x200;
if (!dev_read_bytes(dev, off, 512, &hdr))
return_0;
if ((hdr.magic == cpu_to_be32(DDF_MAGIC)) ||
(hdr.magic == cpu_to_le32(DDF_MAGIC))) {
crc = hdr.crc;
hdr.crc = 0xffffffff;
our_crc = calc_crc(0, (const uint8_t *)&hdr, 512);
if ((cpu_to_be32(our_crc) == crc) ||
(cpu_to_le32(our_crc) == crc)) {
log_debug_devs("Found md ddf magic at %llu crc %x %s",
(unsigned long long)off, crc, dev_name(dev));
return 1;
} else {
log_debug_devs("Found md ddf magic at %llu wrong crc %x disk %x %s",
(unsigned long long)off, our_crc, crc, dev_name(dev));
return 0;
}
}
/* 128KB before the end of device (from libblkid) */
off = ((devsize_bytes / 0x200) - 257) * 0x200;
if (!dev_read_bytes(dev, off, 512, &hdr))
return_0;
if ((hdr.magic == cpu_to_be32(DDF_MAGIC)) ||
(hdr.magic == cpu_to_le32(DDF_MAGIC))) {
crc = hdr.crc;
hdr.crc = 0xffffffff;
our_crc = calc_crc(0, (const uint8_t *)&hdr, 512);
if ((cpu_to_be32(our_crc) == crc) ||
(cpu_to_le32(our_crc) == crc)) {
log_debug_devs("Found md ddf magic at %llu crc %x %s",
(unsigned long long)off, crc, dev_name(dev));
return 1;
} else {
log_debug_devs("Found md ddf magic at %llu wrong crc %x disk %x %s",
(unsigned long long)off, our_crc, crc, dev_name(dev));
return 0;
}
}
return 0;
}
/*
* Calculate the position of the superblock.
* It is always aligned to a 4K boundary and
@ -178,8 +266,8 @@ static int _native_dev_is_md_component(struct device *dev, uint64_t *offset_foun
goto out;
}
/* Check if it is an md component device. */
/* Version 0.90.0 */
/* superblock at 64KB from end of device */
sb_offset = MD_NEW_SIZE_SECTORS(size) << SECTOR_SHIFT;
if (_dev_has_md_magic(dev, sb_offset)) {
ret = 1;
@ -187,8 +275,11 @@ static int _native_dev_is_md_component(struct device *dev, uint64_t *offset_foun
}
minor = MD_MINOR_VERSION_MIN;
/* Version 1, try v1.0 -> v1.2 */
do {
/* superblock at start or 4K from start */
sb_offset = _v1_sb_offset(size, minor);
if (_dev_has_md_magic(dev, sb_offset)) {
ret = 1;
@ -196,6 +287,18 @@ static int _native_dev_is_md_component(struct device *dev, uint64_t *offset_foun
}
} while (++minor <= MD_MINOR_VERSION_MAX);
/* superblock 1K from end of device */
if (_dev_has_imsm_magic(dev, size)) {
ret = 1;
goto out;
}
/* superblock 512 bytes from end, or 128KB from end */
if (_dev_has_ddf_magic(dev, size)) {
ret = 1;
goto out;
}
ret = 0;
out:
if (ret && offset_found)