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Check for minimum partition size

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On Linux block devices used for vdevs will by partitioned.  The block
device must be large enough for an 64M partition starting at offset
of 2048 sectors (part1), and a second 64M reserved partition at the
end of the device (part9).

This commit adds a capacity check when creating the GPT label to
immediately detect a device which is too small.  With the existing
code this would be caught slightly latter when attempting to use
the partition.  Catching it sooner let's us print a more useful error.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #15898
This commit is contained in:
Brian Behlendorf 2024-02-16 09:07:32 -08:00 committed by Tony Hutter
parent 5dda8c0910
commit 9f1d3db730
1 changed files with 10 additions and 0 deletions
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10
lib/libzfs/os/linux/libzfs_pool_os.c
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@ -273,6 +273,16 @@ zpool_label_disk(libzfs_handle_t *hdl, zpool_handle_t *zhp, const char *name)
vtoc->efi_parts[0].p_start = start_block;
vtoc->efi_parts[0].p_size = slice_size;
if (vtoc->efi_parts[0].p_size * vtoc->efi_lbasize < SPA_MINDEVSIZE) {
(void) close(fd);
efi_free(vtoc);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"label '%s': partition would be less than the minimum "
"device size (64M)"), path);
return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
}
/*
* Why we use V_USR: V_BACKUP confuses users, and is considered
* disposable by some EFI utilities (since EFI doesn't have a backup