Ming Lei wrote:
> Sure, thanks for your sharing.
>
> Wakko, could you test the following patch and see if there is any
> difference?
>
> --
> diff --git a/drivers/target/target_core_pscsi.c
> b/drivers/target/target_core_pscsi.c
> index 0d99b242e82e..6147178f1f37 100644
> --- a/drivers/target/target_core_pscsi.c
> +++ b/drivers/target/target_core_pscsi.c
> @@ -888,7 +888,7 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
> u32 sgl_nents,
> if (len > 0 && data_len > 0) {
> bytes = min_t(unsigned int, len, PAGE_SIZE - off);
> bytes = min(bytes, data_len);
> -
> + new_bio:
> if (!bio) {
> nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
> nr_pages -= nr_vecs;
> @@ -931,6 +931,7 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
> u32 sgl_nents,
> * be allocated with pscsi_get_bio() above.
> */
> bio = NULL;
> + goto new_bio;
> }
>
> data_len -= bytes;
Sorry for the delay. I reverted my change, added this one. I didn't
reboot, I just unloaded and loaded this one.
Note: /dev/sr1 as seen from the initiator is /dev/sr0 (physical disc) on the
target.
Doesn't crash, however on the initiator I see this:
[9273849.707777] ISO 9660 Extensions: RRIP_1991A
[9273863.359718] scsi_io_completion: 13 callbacks suppressed
[9273863.359788] sr 26:0:0:0: [sr1] tag#1 UNKNOWN(0x2003) Result: hostbyte=0x00
driverbyte=0x08
[9273863.359909] sr 26:0:0:0: [sr1] tag#1 Sense Key : 0x2 [current]
[9273863.359974] sr 26:0:0:0: [sr1] tag#1 ASC=0x8 ASCQ=0x0
[9273863.360036] sr 26:0:0:0: [sr1] tag#1 CDB: opcode=0x28 28 00 00 22 f6 96 00
00 80 00
[9273863.360116] blk_update_request: 13 callbacks suppressed
[9273863.360177] blk_update_request: I/O error, dev sr1, sector 9165400
[9273875.864648] sr 26:0:0:0: [sr1] tag#1 UNKNOWN(0x2003) Result: hostbyte=0x00
driverbyte=0x08
[9273875.864738] sr 26:0:0:0: [sr1] tag#1 Sense Key : 0x2 [current]
[9273875.864801] sr 26:0:0:0: [sr1] tag#1 ASC=0x8 ASCQ=0x0
[9273875.864890] sr 26:0:0:0: [sr1] tag#1 CDB: opcode=0x28 28 00 00 22 f7 16 00
00 80 00
[9273875.864971] blk_update_request: I/O error, dev sr1, sector 9165912
To cause this, I mounted the dvd as seen in the first line and ran this
command: find /cdrom2 -type f | xargs -tn1 cat > /dev/null
I did some various tests. Each test was done after umount and mount to
clear the cache.
cat <file> > /dev/null causes the message.
dd if=<file> of=/dev/null bs=2048 doesn't
using bs=4096 doesn't
using bs=64k doesn't
using bs=128k does
cat uses a blocksize of 128k.
The following was done without being mounted.
ddrescue -f -f /dev/sr1 /dev/null
doesn't cause the message
dd if=/dev/sr1 of=/dev/null bs=128k
doesn't cause the message
using bs=256k causes the message once:
[9275916.857409] sr 27:0:0:0: [sr1] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00
driverbyte=0x08
[9275916.857482] sr 27:0:0:0: [sr1] tag#0 Sense Key : 0x2 [current]
[9275916.857520] sr 27:0:0:0: [sr1] tag#0 ASC=0x8 ASCQ=0x0
[9275916.857556] sr 27:0:0:0: [sr1] tag#0 CDB: opcode=0x28 28 00 00 00 00 00 00
00 80 00
[9275916.857614] blk_update_request: I/O error, dev sr1, sector 0
If I access the disc from the target natively either by mounting and
accessing files or working with the device directly (ie dd) no errors are
logged on the target.
--
Microsoft has beaten Volkswagen's world record. Volkswagen only created 22
million bugs.
