[Qemu-devel] R: Re: [PATCH] qemu-pr-helper: miscellaneous fixes

[Paolo Bonzini <pbonzini@redhat.com>]

----- Dr. David Alan Gilbert <dgilbert@redhat.com> ha scritto:
> * Paolo Bonzini (pbonzini@redhat.com) wrote:
> > 1) Return a generic sense if TEST UNIT READY does not provide one;
> > 
> > 2) Fix two mistakes in copying from the spec.
> > 
> > Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> 
> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> 
> (Is there a separate fix to the scsi_target_send_command sense
> comment?)

That will be in 2.12 only.

Paolo

> Dave
> 
> > ---
> >  include/scsi/utils.h  |  6 +++++-
> >  scsi/qemu-pr-helper.c | 30 ++++++++++++++++++++++++++----
> >  scsi/utils.c          | 10 ++++++++++
> >  3 files changed, 41 insertions(+), 5 deletions(-)
> > 
> > diff --git a/include/scsi/utils.h b/include/scsi/utils.h
> > index 00a4bdb080..eb07e474ee 100644
> > --- a/include/scsi/utils.h
> > +++ b/include/scsi/utils.h
> > @@ -76,7 +76,11 @@ extern const struct SCSISense sense_code_LUN_FAILURE;
> >  extern const struct SCSISense sense_code_LUN_COMM_FAILURE;
> >  /* Command aborted, Overlapped Commands Attempted */
> >  extern const struct SCSISense sense_code_OVERLAPPED_COMMANDS;
> > -/* LUN not ready, Capacity data has changed */
> > +/* Medium error, Unrecovered read error */
> > +extern const struct SCSISense sense_code_READ_ERROR;
> > +/* LUN not ready, Cause not reportable */
> > +extern const struct SCSISense sense_code_NOT_READY;
> > +/* Unit attention, Capacity data has changed */
> >  extern const struct SCSISense sense_code_CAPACITY_CHANGED;
> >  /* Unit attention, SCSI bus reset */
> >  extern const struct SCSISense sense_code_SCSI_BUS_RESET;
> > diff --git a/scsi/qemu-pr-helper.c b/scsi/qemu-pr-helper.c
> > index dd9785143b..9fe615c73c 100644
> > --- a/scsi/qemu-pr-helper.c
> > +++ b/scsi/qemu-pr-helper.c
> > @@ -314,6 +314,22 @@ static int is_mpath(int fd)
> >      return !strncmp(tgt->target_type, "multipath", DM_MAX_TYPE_NAME);
> >  }
> >  
> > +static SCSISense mpath_generic_sense(int r)
> > +{
> > +    switch (r) {
> > +    case MPATH_PR_SENSE_NOT_READY:
> > +         return SENSE_CODE(NOT_READY);
> > +    case MPATH_PR_SENSE_MEDIUM_ERROR:
> > +         return SENSE_CODE(READ_ERROR);
> > +    case MPATH_PR_SENSE_HARDWARE_ERROR:
> > +         return SENSE_CODE(TARGET_FAILURE);
> > +    case MPATH_PR_SENSE_ABORTED_COMMAND:
> > +         return SENSE_CODE(IO_ERROR);
> > +    default:
> > +         abort();
> > +    }
> > +}
> > +
> >  static int mpath_reconstruct_sense(int fd, int r, uint8_t *sense)
> >  {
> >      switch (r) {
> > @@ -329,7 +345,13 @@ static int mpath_reconstruct_sense(int fd, int r, uint8_t *sense)
> >               */
> >              uint8_t cdb[6] = { TEST_UNIT_READY };
> >              int sz = 0;
> > -            return do_sgio(fd, cdb, sense, NULL, &sz, SG_DXFER_NONE);
> > +            int r = do_sgio(fd, cdb, sense, NULL, &sz, SG_DXFER_NONE);
> > +
> > +            if (r != GOOD) {
> > +                return r;
> > +            }
> > +            scsi_build_sense(sense, mpath_generic_sense(r));
> > +            return CHECK_CONDITION;
> >          }
> >  
> >      case MPATH_PR_SENSE_UNIT_ATTENTION:
> > @@ -449,7 +471,7 @@ static int multipath_pr_out(int fd, const uint8_t *cdb, uint8_t *sense,
> >      memset(&paramp, 0, sizeof(paramp));
> >      memcpy(&paramp.key, &param[0], 8);
> >      memcpy(&paramp.sa_key, &param[8], 8);
> > -    paramp.sa_flags = param[10];
> > +    paramp.sa_flags = param[20];
> >      if (sz > PR_OUT_FIXED_PARAM_SIZE) {
> >          size_t transportid_len;
> >          int i, j;
> > @@ -478,8 +500,8 @@ static int multipath_pr_out(int fd, const uint8_t *cdb, uint8_t *sense,
> >                  j += offsetof(struct transportid, n_port_name[8]);
> >                  i += 24;
> >                  break;
> > -            case 3:
> > -            case 0x43:
> > +            case 5:
> > +            case 0x45:
> >                  /* iSCSI transport.  */
> >                  len = lduw_be_p(&param[i + 2]);
> >                  if (len > 252 || (len & 3) || i + len + 4 > transportid_len) {
> > diff --git a/scsi/utils.c b/scsi/utils.c
> > index 5684951b12..e4182a9b09 100644
> > --- a/scsi/utils.c
> > +++ b/scsi/utils.c
> > @@ -211,6 +211,16 @@ const struct SCSISense sense_code_LUN_COMM_FAILURE = {
> >      .key = ABORTED_COMMAND, .asc = 0x08, .ascq = 0x00
> >  };
> >  
> > +/* Medium Error, Unrecovered read error */
> > +const struct SCSISense sense_code_READ_ERROR = {
> > +    .key = MEDIUM_ERROR, .asc = 0x11, .ascq = 0x00
> > +};
> > +
> > +/* Not ready, Cause not reportable */
> > +const struct SCSISense sense_code_NOT_READY = {
> > +    .key = NOT_READY, .asc = 0x04, .ascq = 0x00
> > +};
> > +
> >  /* Unit attention, Capacity data has changed */
> >  const struct SCSISense sense_code_CAPACITY_CHANGED = {
> >      .key = UNIT_ATTENTION, .asc = 0x2a, .ascq = 0x09
> > -- 
> > 2.14.3
> > 
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK