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mpt2sas: Avoid type casting for direct I/O commands 

A type casting error caused the max volume LBA to be truncated from 64
to 32 bits. The virtual LBA would also get truncated to 32 bits in the
case of a 16-byte READ/WRITE command.

Rewrite entire function to get rid of code duplication and type casts.
Use get/put_unaligned wrappers to extract and replace the LBA field in
the MPI request CDB.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Tested-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sreekanth Reddy 2014-09-12 15:35:21 +05:30 committed by Christoph Hellwig
parent 49563e1e4b
commit daeaa9df92
1 changed files with 35 additions and 72 deletions
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107
drivers/scsi/mpt2sas/mpt2sas_scsih.c
View File

@ -55,6 +55,8 @@
#include <linux/raid_class.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#include "mpt2sas_base.h"
MODULE_AUTHOR(MPT2SAS_AUTHOR);
@ -3858,85 +3860,46 @@ _scsih_setup_direct_io(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
struct _raid_device *raid_device, Mpi2SCSIIORequest_t *mpi_request,
u16 smid)
{
u32 v_lba, p_lba, stripe_off, stripe_unit, column, io_size;
sector_t v_lba, p_lba, stripe_off, stripe_unit, column, io_size;
u32 stripe_sz, stripe_exp;
u8 num_pds, *cdb_ptr, i;
u8 cdb0 = scmd->cmnd[0];
u64 v_llba;
u8 num_pds, cmd = scmd->cmnd[0];
/*
* Try Direct I/O to RAID memeber disks
*/
if (cdb0 == READ_16 || cdb0 == READ_10 ||
cdb0 == WRITE_16 || cdb0 == WRITE_10) {
cdb_ptr = mpi_request->CDB.CDB32;
if (cmd != READ_10 && cmd != WRITE_10 &&
cmd != READ_16 && cmd != WRITE_16)
return;
if ((cdb0 < READ_16) || !(cdb_ptr[2] | cdb_ptr[3] | cdb_ptr[4]
| cdb_ptr[5])) {
io_size = scsi_bufflen(scmd) >>
raid_device->block_exponent;
i = (cdb0 < READ_16) ? 2 : 6;
/* get virtual lba */
v_lba = be32_to_cpu(*(__be32 *)(&cdb_ptr[i]));
if (cmd == READ_10 || cmd == WRITE_10)
v_lba = get_unaligned_be32(&mpi_request->CDB.CDB32[2]);
else
v_lba = get_unaligned_be64(&mpi_request->CDB.CDB32[2]);
if (((u64)v_lba + (u64)io_size - 1) <=
(u32)raid_device->max_lba) {
stripe_sz = raid_device->stripe_sz;
stripe_exp = raid_device->stripe_exponent;
stripe_off = v_lba & (stripe_sz - 1);
io_size = scsi_bufflen(scmd) >> raid_device->block_exponent;
/* Check whether IO falls within a stripe */
if ((stripe_off + io_size) <= stripe_sz) {
num_pds = raid_device->num_pds;
p_lba = v_lba >> stripe_exp;
stripe_unit = p_lba / num_pds;
column = p_lba % num_pds;
p_lba = (stripe_unit << stripe_exp) +
stripe_off;
mpi_request->DevHandle =
cpu_to_le16(raid_device->
pd_handle[column]);
(*(__be32 *)(&cdb_ptr[i])) =
cpu_to_be32(p_lba);
/*
* WD: To indicate this I/O is directI/O
*/
_scsih_scsi_direct_io_set(ioc, smid, 1);
}
}
} else {
io_size = scsi_bufflen(scmd) >>
raid_device->block_exponent;
/* get virtual lba */
v_llba = be64_to_cpu(*(__be64 *)(&cdb_ptr[2]));
if (v_lba + io_size - 1 > raid_device->max_lba)
return;
if ((v_llba + (u64)io_size - 1) <=
raid_device->max_lba) {
stripe_sz = raid_device->stripe_sz;
stripe_exp = raid_device->stripe_exponent;
stripe_off = (u32) (v_llba & (stripe_sz - 1));
stripe_sz = raid_device->stripe_sz;
stripe_exp = raid_device->stripe_exponent;
stripe_off = v_lba & (stripe_sz - 1);
/* Check whether IO falls within a stripe */
if ((stripe_off + io_size) <= stripe_sz) {
num_pds = raid_device->num_pds;
p_lba = (u32)(v_llba >> stripe_exp);
stripe_unit = p_lba / num_pds;
column = p_lba % num_pds;
p_lba = (stripe_unit << stripe_exp) +
stripe_off;
mpi_request->DevHandle =
cpu_to_le16(raid_device->
pd_handle[column]);
(*(__be64 *)(&cdb_ptr[2])) =
cpu_to_be64((u64)p_lba);
/*
* WD: To indicate this I/O is directI/O
*/
_scsih_scsi_direct_io_set(ioc, smid, 1);
}
}
}
}
/* Return unless IO falls within a stripe */
if (stripe_off + io_size > stripe_sz)
return;
num_pds = raid_device->num_pds;
p_lba = v_lba >> stripe_exp;
stripe_unit = p_lba / num_pds;
column = p_lba % num_pds;
p_lba = (stripe_unit << stripe_exp) + stripe_off;
mpi_request->DevHandle = cpu_to_le16(raid_device->pd_handle[column]);
if (cmd == READ_10 || cmd == WRITE_10)
put_unaligned_be32(lower_32_bits(p_lba),
&mpi_request->CDB.CDB32[2]);
else
put_unaligned_be64(p_lba, &mpi_request->CDB.CDB32[2]);
_scsih_scsi_direct_io_set(ioc, smid, 1);
}
/**