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[SCSI] fix recovered error handling

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We have a problem with recovered error handling in that any command
which goes down as BLOCK_PC but which returns a sense code of RECOVERED
ERROR gets completed with -EIO.  For actual SG_IO commands, this doesn't
matter at all, since the error return code gets dropped in favour of
req->errors which contain the SCSI completion code.

However, if this command is part of the block system, then it will pay
attention to the returned error code.  In particularly if a SYNCHRONIZE
CACHE from a barrier command completes with RECOVERED ERROR, the
resulting -EIO on the barrier causes block to error the request and
return it to the filesystem.  Fix this by converting the -EIO for
recovered error to zero, plus remove the printing of this from sd and sr
so the message isn't double printed.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Bottomley 2009-03-30 16:55:51 +00:00
parent a2f5bfcf71
commit a9bddd7463
3 changed files with 16 additions and 16 deletions
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17
drivers/scsi/scsi_lib.c
View File

@ -791,7 +791,22 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
"%d bytes done.\n",
req->nr_sectors, good_bytes));
/* A number of bytes were successfully read. If there
/*
* Recovered errors need reporting, but they're always treated
* as success, so fiddle the result code here. For BLOCK_PC
* we already took a copy of the original into rq->errors which
* is what gets returned to the user
*/
if (sense_valid && sshdr.sense_key == RECOVERED_ERROR) {
if (!(req->cmd_flags & REQ_QUIET))
scsi_print_sense("", cmd);
result = 0;
/* BLOCK_PC may have set error */
error = 0;
}
/*
* A number of bytes were successfully read. If there
* are leftovers and there is some kind of error
* (result != 0), retry the rest.
*/

6
drivers/scsi/sd.c
View File

@ -1051,12 +1051,6 @@ static int sd_done(struct scsi_cmnd *SCpnt)
good_bytes = sd_completed_bytes(SCpnt);
break;
case RECOVERED_ERROR:
/* Inform the user, but make sure that it's not treated
* as a hard error.
*/
scsi_print_sense("sd", SCpnt);
SCpnt->result = 0;
memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
good_bytes = scsi_bufflen(SCpnt);
break;
case NO_SENSE:

9
drivers/scsi/sr.c
View File

@ -309,15 +309,6 @@ static int sr_done(struct scsi_cmnd *SCpnt)
break;
case RECOVERED_ERROR:
/*
* An error occured, but it recovered. Inform the
* user, but make sure that it's not treated as a
* hard error.
*/
scsi_print_sense("sr", SCpnt);
SCpnt->result = 0;
SCpnt->sense_buffer[0] = 0x0;
good_bytes = this_count;
break;