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authorAl Viro <viro@parcelfarce.linux.theplanet.co.uk>2005-05-16 01:59:55 +0100
committerJames Bottomley <jejb@mulgrave.(none)>2005-05-26 08:41:15 -0500
commit631e8a1398ce4cfef8b30678d51daf0c64313a09 (patch)
tree14d3b601b4a7160568c58d53a94a0a4711094588 /drivers/scsi/sd.c
parent53222b906903fd861dc24ebccfa07ee125941313 (diff)
[SCSI] TYPE_RBC cache fixes (sbp2.c affected)
a) TYPE_SDAD renamed to TYPE_RBC and taken to scsi.h b) in sbp2.c remapping of TYPE_RPB to TYPE_DISK turned off c) relevant places in midlayer and sd.c taught to accept TYPE_RBC d) sd.c::sd_read_cache_type() looks into page 6 when dealing with TYPE_RBC - these guys have writeback cache flag there and are not guaranteed to have page 8 at all. e) sd_read_cache_type() got an extra sanity check - it checks that it got the page it asked for before using its contents. And screams if mismatch had happened. Rationale: there are broken devices out there that are "helpful" enough to go for "I don't have a page you've asked for, here, have another one". For example, PL3507 had been caught doing just that... f) sbp2 sets sdev->use_10_for_rw and sdev->use_10_for_ms instead of bothering to remap READ6/WRITE6/MOD_SENSE, so most of the conversions in there are gone now. Incidentally, I wonder if USB storage devices that have no mode page 8 are simply RBC ones. I haven't touched that, but it might be interesting to check... Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c36
1 files changed, 27 insertions, 9 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 19afb25e44d3..bb8235598787 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1368,17 +1368,26 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
*/
static void
sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
- struct scsi_request *SRpnt, unsigned char *buffer) {
+ struct scsi_request *SRpnt, unsigned char *buffer)
+{
int len = 0, res;
- const int dbd = 0; /* DBD */
- const int modepage = 0x08; /* current values, cache page */
+ int dbd;
+ int modepage;
struct scsi_mode_data data;
struct scsi_sense_hdr sshdr;
if (sdkp->device->skip_ms_page_8)
goto defaults;
+ if (sdkp->device->type == TYPE_RBC) {
+ modepage = 6;
+ dbd = 8;
+ } else {
+ modepage = 8;
+ dbd = 0;
+ }
+
/* cautiously ask */
res = sd_do_mode_sense(SRpnt, dbd, modepage, buffer, 4, &data);
@@ -1409,11 +1418,20 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
"write back, no read (daft)"
};
int ct = 0;
- int offset = data.header_length +
- data.block_descriptor_length + 2;
+ int offset = data.header_length + data.block_descriptor_length;
- sdkp->WCE = ((buffer[offset] & 0x04) != 0);
- sdkp->RCD = ((buffer[offset] & 0x01) != 0);
+ if ((buffer[offset] & 0x3f) != modepage) {
+ printk(KERN_ERR "%s: got wrong page\n", diskname);
+ goto defaults;
+ }
+
+ if (modepage == 8) {
+ sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
+ sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
+ } else {
+ sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
+ sdkp->RCD = 0;
+ }
ct = sdkp->RCD + 2*sdkp->WCE;
@@ -1533,7 +1551,7 @@ static int sd_probe(struct device *dev)
int error;
error = -ENODEV;
- if ((sdp->type != TYPE_DISK) && (sdp->type != TYPE_MOD))
+ if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
goto out;
SCSI_LOG_HLQUEUE(3, printk("sd_attach: scsi device: <%d,%d,%d,%d>\n",
@@ -1570,7 +1588,7 @@ static int sd_probe(struct device *dev)
sdkp->openers = 0;
if (!sdp->timeout) {
- if (sdp->type == TYPE_DISK)
+ if (sdp->type != TYPE_MOD)
sdp->timeout = SD_TIMEOUT;
else
sdp->timeout = SD_MOD_TIMEOUT;