From: Peter Oberparleiter Date: Mon, 19 Jul 2010 07:22:35 +0000 (+0200) Subject: [S390] dasd: use correct label location for diag fba disks X-Git-Tag: v2.6.35-rc6~30^2~2 X-Git-Url: https://bbs.cooldavid.org/git/?p=net-next-2.6.git;a=commitdiff_plain;h=cffab6bc5511cd6f67a60bf16b62de4267b68c4c [S390] dasd: use correct label location for diag fba disks Partition boundary calculation fails for DASD FBA disks under the following conditions: - disk is formatted with CMS FORMAT with a blocksize of more than 512 bytes - all of the disk is reserved to a single CMS file using CMS RESERVE - the disk is accessed using the DIAG mode of the DASD driver Under these circumstances, the partition detection code tries to read the CMS label block containing partition-relevant information from logical block offset 1, while it is in fact located at physical block offset 1. Fix this problem by using the correct CMS label block location depending on the device type as determined by the DASD SENSE ID information. Signed-off-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky --- diff --git a/fs/partitions/ibm.c b/fs/partitions/ibm.c index 3e73de5967f..fc8497643fd 100644 --- a/fs/partitions/ibm.c +++ b/fs/partitions/ibm.c @@ -74,6 +74,7 @@ int ibm_partition(struct parsed_partitions *state) } *label; unsigned char *data; Sector sect; + sector_t labelsect; res = 0; blocksize = bdev_logical_block_size(bdev); @@ -97,11 +98,20 @@ int ibm_partition(struct parsed_partitions *state) ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0) goto out_freeall; + /* + * Special case for FBA disks: label sector does not depend on + * blocksize. + */ + if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) || + (info->cu_type == 0x3880 && info->dev_type == 0x3370)) + labelsect = info->label_block; + else + labelsect = info->label_block * (blocksize >> 9); + /* * Get volume label, extract name and type. */ - data = read_part_sector(state, info->label_block*(blocksize/512), - §); + data = read_part_sector(state, labelsect, §); if (data == NULL) goto out_readerr;