On 2021/04/14 7:11, Naohiro Aota wrote:
> This patch makes libblkid zone-aware. It can probe the magic located at
> some offset from the beginning of some specific zone of a device.
>
> Ths patch introduces some new fields to struct blkid_idmag. They indicate
> the magic location is placed related to a zone, and the offset in the zone.
>
> Also, this commit introduces `zone_size` to struct blkid_struct_probe. It
> stores the size of zones of a device.
>
> Signed-off-by: Naohiro Aota <naohiro.a...@wdc.com>
> ---
> configure.ac | 1 +
> libblkid/src/blkidP.h | 5 +++++
> libblkid/src/probe.c | 26 ++++++++++++++++++++++++--
> 3 files changed, 30 insertions(+), 2 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index bebb4085425a..52b164e834db 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -302,6 +302,7 @@ AC_CHECK_HEADERS([ \
> lastlog.h \
> libutil.h \
> linux/btrfs.h \
> + linux/blkzoned.h \
> linux/capability.h \
> linux/cdrom.h \
> linux/falloc.h \
> diff --git a/libblkid/src/blkidP.h b/libblkid/src/blkidP.h
> index a3fe6748a969..e3a160aa97c0 100644
> --- a/libblkid/src/blkidP.h
> +++ b/libblkid/src/blkidP.h
> @@ -150,6 +150,10 @@ struct blkid_idmag
> const char *hoff; /* hint which contains byte offset to
> kboff */
> long kboff; /* kilobyte offset of superblock */
> unsigned int sboff; /* byte offset within superblock */
> +
> + int is_zoned; /* indicate magic location is
> calcluated based on zone position */
> + long zonenum; /* zone number which has superblock */
> + long kboff_inzone; /* kilobyte offset of superblock in a
> zone */
> };
>
> /*
> @@ -206,6 +210,7 @@ struct blkid_struct_probe
> dev_t disk_devno; /* devno of the whole-disk or 0
> */
> unsigned int blkssz; /* sector size (BLKSSZGET
> ioctl) */
> mode_t mode; /* struct stat.sb_mode */
> + uint64_t zone_size; /* zone size (BLKGETZONESZ
> ioctl) */
>
> int flags; /* private library flags */
> int prob_flags; /* always zeroized by
> blkid_do_*() */
> diff --git a/libblkid/src/probe.c b/libblkid/src/probe.c
> index a47a8720d4ac..102766e57aa0 100644
> --- a/libblkid/src/probe.c
> +++ b/libblkid/src/probe.c
> @@ -94,6 +94,9 @@
> #ifdef HAVE_LINUX_CDROM_H
> #include <linux/cdrom.h>
> #endif
> +#ifdef HAVE_LINUX_BLKZONED_H
> +#include <linux/blkzoned.h>
> +#endif
> #ifdef HAVE_SYS_STAT_H
> #include <sys/stat.h>
> #endif
> @@ -871,6 +874,7 @@ int blkid_probe_set_device(blkid_probe pr, int fd,
> #ifdef CDROM_GET_CAPABILITY
> long last_written = 0;
> #endif
> + uint32_t zone_size_sector;
Move this declaration under the # ifdef HAVE_LINUX_BLKZONED_H where it is used
below ?
>
> blkid_reset_probe(pr);
> blkid_probe_reset_buffers(pr);
> @@ -897,6 +901,7 @@ int blkid_probe_set_device(blkid_probe pr, int fd,
> pr->wipe_off = 0;
> pr->wipe_size = 0;
> pr->wipe_chain = NULL;
> + pr->zone_size = 0;
>
> if (fd < 0)
> return 1;
> @@ -996,6 +1001,11 @@ int blkid_probe_set_device(blkid_probe pr, int fd,
> #endif
> free(dm_uuid);
>
> +# ifdef HAVE_LINUX_BLKZONED_H
> + if (S_ISBLK(sb.st_mode) && !ioctl(pr->fd, BLKGETZONESZ,
> &zone_size_sector))
> + pr->zone_size = zone_size_sector << 9;
> +# endif
So something like:
# ifdef HAVE_LINUX_BLKZONED_H
if (S_ISBLK(sb.st_mode)) {
uint32_t zone_size_sector;
if (!ioctl(pr->fd, BLKGETZONESZ, &zone_size_sector))
pr->zone_size = zone_size_sector << 9;
}
# endif
Otherwise, you probably will get a compiler warning as zone_size_sector will be
unused if HAVE_LINUX_BLKZONED_H is false.
> +
> DBG(LOWPROBE, ul_debug("ready for low-probing, offset=%"PRIu64",
> size=%"PRIu64"",
> pr->off, pr->size));
> DBG(LOWPROBE, ul_debug("whole-disk: %s, regfile: %s",
> @@ -1064,12 +1074,24 @@ int blkid_probe_get_idmag(blkid_probe pr, const
> struct blkid_idinfo *id,
> /* try to detect by magic string */
> while(mag && mag->magic) {
> unsigned char *buf;
> + uint64_t kboff;
> uint64_t hint_offset;
>
> if (!mag->hoff || blkid_probe_get_hint(pr, mag->hoff,
> &hint_offset) < 0)
> hint_offset = 0;
>
> - off = hint_offset + ((mag->kboff + (mag->sboff >> 10)) << 10);
> + /* If the magic is for zoned device, skip non-zoned device */
> + if (mag->is_zoned && !pr->zone_size) {
> + mag++;
> + continue;
> + }
> +
> + if (!mag->is_zoned)
> + kboff = mag->kboff;
> + else
> + kboff = ((mag->zonenum * pr->zone_size) >> 10) +
> mag->kboff_inzone;
> +
> + off = hint_offset + ((kboff + (mag->sboff >> 10)) << 10);
> buf = blkid_probe_get_buffer(pr, off, 1024);
>
> if (!buf && errno)
> @@ -1079,7 +1101,7 @@ int blkid_probe_get_idmag(blkid_probe pr, const struct
> blkid_idinfo *id,
> buf + (mag->sboff & 0x3ff), mag->len)) {
>
> DBG(LOWPROBE, ul_debug("\tmagic sboff=%u, kboff=%ld",
> - mag->sboff, mag->kboff));
> + mag->sboff, kboff));
> if (offset)
> *offset = off + (mag->sboff & 0x3ff);
> if (res)
>
--
Damien Le Moal
Western Digital Research
