diff options
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 108 | ||||
| -rw-r--r-- | drivers/scsi/sd.c | 143 | ||||
| -rw-r--r-- | drivers/scsi/sr.c | 2 | ||||
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 2 |
4 files changed, 106 insertions, 149 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 3d04a9f..4c4add5 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -855,8 +855,7 @@ static void scsi_release_buffers(struct scsi_cmnd *cmd) * b) We can just use scsi_requeue_command() here. This would * be used if we just wanted to retry, for example. */ -void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes, - unsigned int block_bytes) +void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) { int result = cmd->result; int this_count = cmd->bufflen; @@ -921,87 +920,72 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes, * Next deal with any sectors which we were able to correctly * handle. */ - if (good_bytes >= 0) { - SCSI_LOG_HLCOMPLETE(1, printk("%ld sectors total, %d bytes done.\n", + if (good_bytes > 0) { + SCSI_LOG_HLCOMPLETE(1, printk("%ld sectors total, " + "%d bytes done.\n", req->nr_sectors, good_bytes)); SCSI_LOG_HLCOMPLETE(1, printk("use_sg is %d\n", cmd->use_sg)); if (clear_errors) req->errors = 0; - /* - * If multiple sectors are requested in one buffer, then - * they will have been finished off by the first command. - * If not, then we have a multi-buffer command. - * - * If block_bytes != 0, it means we had a medium error - * of some sort, and that we want to mark some number of - * sectors as not uptodate. Thus we want to inhibit - * requeueing right here - we will requeue down below - * when we handle the bad sectors. - */ - /* - * If the command completed without error, then either - * finish off the rest of the command, or start a new one. + /* A number of bytes were successfully read. If there + * is leftovers and there is some kind of error + * (result != 0), retry the rest. */ - if (scsi_end_request(cmd, 1, good_bytes, result == 0) == NULL) + if (scsi_end_request(cmd, 1, good_bytes, !!result) == NULL) return; } - /* - * Now, if we were good little boys and girls, Santa left us a request - * sense buffer. We can extract information from this, so we - * can choose a block to remap, etc. + + /* good_bytes = 0, or (inclusive) there were leftovers and + * result = 0, so scsi_end_request couldn't retry. */ if (sense_valid && !sense_deferred) { switch (sshdr.sense_key) { case UNIT_ATTENTION: if (cmd->device->removable) { - /* detected disc change. set a bit + /* Detected disc change. Set a bit * and quietly refuse further access. */ cmd->device->changed = 1; - scsi_end_request(cmd, 0, - this_count, 1); + scsi_end_request(cmd, 0, this_count, 1); return; } else { - /* - * Must have been a power glitch, or a - * bus reset. Could not have been a - * media change, so we just retry the - * request and see what happens. - */ + /* Must have been a power glitch, or a + * bus reset. Could not have been a + * media change, so we just retry the + * request and see what happens. + */ scsi_requeue_command(q, cmd); return; } break; case ILLEGAL_REQUEST: - /* - * If we had an ILLEGAL REQUEST returned, then we may - * have performed an unsupported command. The only - * thing this should be would be a ten byte read where - * only a six byte read was supported. Also, on a - * system where READ CAPACITY failed, we may have read - * past the end of the disk. - */ + /* If we had an ILLEGAL REQUEST returned, then + * we may have performed an unsupported + * command. The only thing this should be + * would be a ten byte read where only a six + * byte read was supported. Also, on a system + * where READ CAPACITY failed, we may have + * read past the end of the disk. + */ if ((cmd->device->use_10_for_rw && sshdr.asc == 0x20 && sshdr.ascq == 0x00) && (cmd->cmnd[0] == READ_10 || cmd->cmnd[0] == WRITE_10)) { cmd->device->use_10_for_rw = 0; - /* - * This will cause a retry with a 6-byte - * command. + /* This will cause a retry with a + * 6-byte command. */ scsi_requeue_command(q, cmd); - result = 0; + return; } else { scsi_end_request(cmd, 0, this_count, 1); return; } break; case NOT_READY: - /* - * If the device is in the process of becoming + /* If the device is in the process of becoming * ready, or has a temporary blockage, retry. */ if (sshdr.asc == 0x04) { @@ -1021,7 +1005,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes, } if (!(req->flags & REQ_QUIET)) { scmd_printk(KERN_INFO, cmd, - "Device not ready: "); + "Device not ready: "); scsi_print_sense_hdr("", &sshdr); } scsi_end_request(cmd, 0, this_count, 1); @@ -1029,21 +1013,21 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes, case VOLUME_OVERFLOW: if (!(req->flags & REQ_QUIET)) { scmd_printk(KERN_INFO, cmd, - "Volume overflow, CDB: "); + "Volume overflow, CDB: "); __scsi_print_command(cmd->data_cmnd); scsi_print_sense("", cmd); } - scsi_end_request(cmd, 0, block_bytes, 1); + /* See SSC3rXX or current. */ + scsi_end_request(cmd, 0, this_count, 1); return; default: break; } - } /* driver byte != 0 */ + } if (host_byte(result) == DID_RESET) { - /* - * Third party bus reset or reset for error - * recovery reasons. Just retry the request - * and see what happens. + /* Third party bus reset or reset for error recovery + * reasons. Just retry the request and see what + * happens. */ scsi_requeue_command(q, cmd); return; @@ -1051,21 +1035,13 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes, if (result) { if (!(req->flags & REQ_QUIET)) { scmd_printk(KERN_INFO, cmd, - "SCSI error: return code = 0x%x\n", result); - + "SCSI error: return code = 0x%08x\n", + result); if (driver_byte(result) & DRIVER_SENSE) scsi_print_sense("", cmd); } - /* - * Mark a single buffer as not uptodate. Queue the remainder. - * We sometimes get this cruft in the event that a medium error - * isn't properly reported. - */ - block_bytes = req->hard_cur_sectors << 9; - if (!block_bytes) - block_bytes = req->data_len; - scsi_end_request(cmd, 0, block_bytes, 1); } + scsi_end_request(cmd, 0, this_count, !result); } EXPORT_SYMBOL(scsi_io_completion); @@ -1169,7 +1145,7 @@ static void scsi_blk_pc_done(struct scsi_cmnd *cmd) * successfully. Since this is a REQ_BLOCK_PC command the * caller should check the request's errors value */ - scsi_io_completion(cmd, cmd->bufflen, 0); + scsi_io_completion(cmd, cmd->bufflen); } static void scsi_setup_blk_pc_cmnd(struct scsi_cmnd *cmd) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 3541990..f899ff0 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -891,11 +891,10 @@ static struct block_device_operations sd_fops = { static void sd_rw_intr(struct scsi_cmnd * SCpnt) { int result = SCpnt->result; - int this_count = SCpnt->request_bufflen; - int good_bytes = (result == 0 ? this_count : 0); - sector_t block_sectors = 1; - u64 first_err_block; - sector_t error_sector; + unsigned int xfer_size = SCpnt->request_bufflen; + unsigned int good_bytes = result ? 0 : xfer_size; + u64 start_lba = SCpnt->request->sector; + u64 bad_lba; struct scsi_sense_hdr sshdr; int sense_valid = 0; int sense_deferred = 0; @@ -906,7 +905,6 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt) if (sense_valid) sense_deferred = scsi_sense_is_deferred(&sshdr); } - #ifdef CONFIG_SCSI_LOGGING SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n", SCpnt->request->rq_disk->disk_name, result)); @@ -916,89 +914,72 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt) sshdr.sense_key, sshdr.asc, sshdr.ascq)); } #endif - /* - Handle MEDIUM ERRORs that indicate partial success. Since this is a - relatively rare error condition, no care is taken to avoid - unnecessary additional work such as memcpy's that could be avoided. - */ - if (driver_byte(result) != 0 && - sense_valid && !sense_deferred) { - switch (sshdr.sense_key) { - case MEDIUM_ERROR: - if (!blk_fs_request(SCpnt->request)) - break; - info_valid = scsi_get_sense_info_fld( - SCpnt->sense_buffer, SCSI_SENSE_BUFFERSIZE, - &first_err_block); - /* - * May want to warn and skip if following cast results - * in actual truncation (if sector_t < 64 bits) - */ - error_sector = (sector_t)first_err_block; - if (SCpnt->request->bio != NULL) - block_sectors = bio_sectors(SCpnt->request->bio); - switch (SCpnt->device->sector_size) { - case 1024: - error_sector <<= 1; - if (block_sectors < 2) - block_sectors = 2; - break; - case 2048: - error_sector <<= 2; - if (block_sectors < 4) - block_sectors = 4; - break; - case 4096: - error_sector <<=3; - if (block_sectors < 8) - block_sectors = 8; - break; - case 256: - error_sector >>= 1; - break; - default: - break; - } + if (driver_byte(result) != DRIVER_SENSE && + (!sense_valid || sense_deferred)) + goto out; - error_sector &= ~(block_sectors - 1); - good_bytes = (error_sector - SCpnt->request->sector) << 9; - if (good_bytes < 0 || good_bytes >= this_count) - good_bytes = 0; + switch (sshdr.sense_key) { + case HARDWARE_ERROR: + case MEDIUM_ERROR: + if (!blk_fs_request(SCpnt->request)) + goto out; + info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, + SCSI_SENSE_BUFFERSIZE, + &bad_lba); + if (!info_valid) + goto out; + if (xfer_size <= SCpnt->device->sector_size) + goto out; + switch (SCpnt->device->sector_size) { + case 256: + start_lba <<= 1; break; - - case RECOVERED_ERROR: /* an error occurred, but it recovered */ - case NO_SENSE: /* LLDD got sense data */ - /* - * 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 = this_count; + case 512: break; - - case ILLEGAL_REQUEST: - if (SCpnt->device->use_10_for_rw && - (SCpnt->cmnd[0] == READ_10 || - SCpnt->cmnd[0] == WRITE_10)) - SCpnt->device->use_10_for_rw = 0; - if (SCpnt->device->use_10_for_ms && - (SCpnt->cmnd[0] == MODE_SENSE_10 || - SCpnt->cmnd[0] == MODE_SELECT_10)) - SCpnt->device->use_10_for_ms = 0; + case 1024: + start_lba >>= 1; + break; + case 2048: + start_lba >>= 2; + break; + case 4096: + start_lba >>= 3; break; - default: + /* Print something here with limiting frequency. */ + goto out; break; } + /* This computation should always be done in terms of + * the resolution of the device's medium. + */ + good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; + break; + case RECOVERED_ERROR: + case NO_SENSE: + /* 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 = xfer_size; + break; + case ILLEGAL_REQUEST: + if (SCpnt->device->use_10_for_rw && + (SCpnt->cmnd[0] == READ_10 || + SCpnt->cmnd[0] == WRITE_10)) + SCpnt->device->use_10_for_rw = 0; + if (SCpnt->device->use_10_for_ms && + (SCpnt->cmnd[0] == MODE_SENSE_10 || + SCpnt->cmnd[0] == MODE_SELECT_10)) + SCpnt->device->use_10_for_ms = 0; + break; + default: + break; } - /* - * This calls the generic completion function, now that we know - * how many actual sectors finished, and how many sectors we need - * to say have failed. - */ - scsi_io_completion(SCpnt, good_bytes, block_sectors << 9); + out: + scsi_io_completion(SCpnt, good_bytes); } static int media_not_present(struct scsi_disk *sdkp, diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index ebf6579..fd94408 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -292,7 +292,7 @@ static void rw_intr(struct scsi_cmnd * SCpnt) * how many actual sectors finished, and how many sectors we need * to say have failed. */ - scsi_io_completion(SCpnt, good_bytes, block_sectors << 9); + scsi_io_completion(SCpnt, good_bytes); } static int sr_init_command(struct scsi_cmnd * SCpnt) diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index e46cd40..371f70d 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -143,7 +143,7 @@ struct scsi_cmnd { extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); extern void scsi_put_command(struct scsi_cmnd *); -extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int); +extern void scsi_io_completion(struct scsi_cmnd *, unsigned int); extern void scsi_finish_command(struct scsi_cmnd *cmd); extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); |
