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authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>2010-07-19 09:22:35 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-07-19 09:22:50 +0200
commitcffab6bc5511cd6f67a60bf16b62de4267b68c4c (patch)
treeedcc2a5ed2ef5865e98c8fa01bcb866a579edf89
parenta9f7f2e74ae0e6a801a2433dc8e9124d73da0cb4 (diff)
downloadop-kernel-dev-cffab6bc5511cd6f67a60bf16b62de4267b68c4c.zip
op-kernel-dev-cffab6bc5511cd6f67a60bf16b62de4267b68c4c.tar.gz
[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 <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--fs/partitions/ibm.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/partitions/ibm.c b/fs/partitions/ibm.c
index 3e73de5..fc84976 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);
@@ -98,10 +99,19 @@ int ibm_partition(struct parsed_partitions *state)
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),
- &sect);
+ data = read_part_sector(state, labelsect, &sect);
if (data == NULL)
goto out_readerr;
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