X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fscsi%2Fsd.c;h=930db398d107f4b1a7310ee399a6ab7e692b89b6;hb=4837c672fd4d43c519d6b53308ee68d45b91b872;hp=3d3ad7d1b779687046c741f799524a7f91b36aa1;hpb=1cb9e8e01d2c73184e2074f37cd155b3c4fdaae6;p=linux-2.6 diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 3d3ad7d1b7..930db398d1 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -49,6 +49,7 @@ #include #include #include +#include #include #include @@ -102,6 +103,7 @@ struct scsi_disk { u8 write_prot; unsigned WCE : 1; /* state of disk WCE bit */ unsigned RCD : 1; /* state of disk RCD bit, unused */ + unsigned DPOFUA : 1; /* state of disk DPOFUA bit */ }; static DEFINE_IDR(sd_index_idr); @@ -110,7 +112,7 @@ static DEFINE_SPINLOCK(sd_index_lock); /* This semaphore is used to mediate the 0->1 reference get in the * face of object destruction (i.e. we can't allow a get on an * object after last put) */ -static DECLARE_MUTEX(sd_ref_sem); +static DEFINE_MUTEX(sd_ref_mutex); static int sd_revalidate_disk(struct gendisk *disk); static void sd_rw_intr(struct scsi_cmnd * SCpnt); @@ -121,8 +123,7 @@ static void sd_shutdown(struct device *dev); static void sd_rescan(struct device *); static int sd_init_command(struct scsi_cmnd *); static int sd_issue_flush(struct device *, sector_t *); -static void sd_end_flush(request_queue_t *, struct request *); -static int sd_prepare_flush(request_queue_t *, struct request *); +static void sd_prepare_flush(request_queue_t *, struct request *); static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname, unsigned char *buffer); @@ -137,8 +138,6 @@ static struct scsi_driver sd_template = { .rescan = sd_rescan, .init_command = sd_init_command, .issue_flush = sd_issue_flush, - .prepare_flush = sd_prepare_flush, - .end_flush = sd_end_flush, }; /* @@ -195,9 +194,9 @@ static struct scsi_disk *scsi_disk_get(struct gendisk *disk) { struct scsi_disk *sdkp; - down(&sd_ref_sem); + mutex_lock(&sd_ref_mutex); sdkp = __scsi_disk_get(disk); - up(&sd_ref_sem); + mutex_unlock(&sd_ref_mutex); return sdkp; } @@ -205,11 +204,11 @@ static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) { struct scsi_disk *sdkp; - down(&sd_ref_sem); + mutex_lock(&sd_ref_mutex); sdkp = dev_get_drvdata(dev); if (sdkp) sdkp = __scsi_disk_get(sdkp->disk); - up(&sd_ref_sem); + mutex_unlock(&sd_ref_mutex); return sdkp; } @@ -217,10 +216,10 @@ static void scsi_disk_put(struct scsi_disk *sdkp) { struct scsi_device *sdev = sdkp->device; - down(&sd_ref_sem); + mutex_lock(&sd_ref_mutex); kref_put(&sdkp->kref, scsi_disk_release); scsi_device_put(sdev); - up(&sd_ref_sem); + mutex_unlock(&sd_ref_mutex); } /** @@ -233,34 +232,12 @@ static void scsi_disk_put(struct scsi_disk *sdkp) **/ static int sd_init_command(struct scsi_cmnd * SCpnt) { - unsigned int this_count, timeout; - struct gendisk *disk; - sector_t block; struct scsi_device *sdp = SCpnt->device; struct request *rq = SCpnt->request; - - timeout = sdp->timeout; - - /* - * SG_IO from block layer already setup, just copy cdb basically - */ - if (blk_pc_request(rq)) { - scsi_setup_blk_pc_cmnd(SCpnt); - if (rq->timeout) - timeout = rq->timeout; - - goto queue; - } - - /* - * we only do REQ_CMD and REQ_BLOCK_PC - */ - if (!blk_fs_request(rq)) - return 0; - - disk = rq->rq_disk; - block = rq->sector; - this_count = SCpnt->request_bufflen >> 9; + struct gendisk *disk = rq->rq_disk; + sector_t block = rq->sector; + unsigned int this_count = SCpnt->request_bufflen >> 9; + unsigned int timeout = sdp->timeout; SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, " "count=%d\n", disk->disk_name, @@ -346,6 +323,7 @@ static int sd_init_command(struct scsi_cmnd * SCpnt) if (block > 0xffffffff) { SCpnt->cmnd[0] += READ_16 - READ_6; + SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; @@ -365,6 +343,7 @@ static int sd_init_command(struct scsi_cmnd * SCpnt) this_count = 0xffff; SCpnt->cmnd[0] += READ_10 - READ_6; + SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; @@ -373,6 +352,17 @@ static int sd_init_command(struct scsi_cmnd * SCpnt) SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; } else { + if (unlikely(blk_fua_rq(rq))) { + /* + * This happens only if this drive failed + * 10byte rw command with ILLEGAL_REQUEST + * during operation and thus turned off + * use_10_for_rw. + */ + printk(KERN_ERR "sd: FUA write on READ/WRITE(6) drive\n"); + return 0; + } + SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); SCpnt->cmnd[3] = (unsigned char) block & 0xff; @@ -390,8 +380,6 @@ static int sd_init_command(struct scsi_cmnd * SCpnt) SCpnt->transfersize = sdp->sector_size; SCpnt->underflow = this_count << 9; SCpnt->allowed = SD_MAX_RETRIES; - -queue: SCpnt->timeout_per_command = timeout; /* @@ -516,7 +504,7 @@ static int sd_release(struct inode *inode, struct file *filp) return 0; } -static int sd_hdio_getgeo(struct block_device *bdev, struct hd_geometry __user *loc) +static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) { struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); struct scsi_device *sdp = sdkp->device; @@ -534,15 +522,9 @@ static int sd_hdio_getgeo(struct block_device *bdev, struct hd_geometry __user * else scsicam_bios_param(bdev, sdkp->capacity, diskinfo); - if (put_user(diskinfo[0], &loc->heads)) - return -EFAULT; - if (put_user(diskinfo[1], &loc->sectors)) - return -EFAULT; - if (put_user(diskinfo[2], &loc->cylinders)) - return -EFAULT; - if (put_user((unsigned)get_start_sect(bdev), - (unsigned long __user *)&loc->start)) - return -EFAULT; + geo->heads = diskinfo[0]; + geo->sectors = diskinfo[1]; + geo->cylinders = diskinfo[2]; return 0; } @@ -582,12 +564,6 @@ static int sd_ioctl(struct inode * inode, struct file * filp, if (!scsi_block_when_processing_errors(sdp) || !error) return error; - if (cmd == HDIO_GETGEO) { - if (!arg) - return -EINVAL; - return sd_hdio_getgeo(bdev, p); - } - /* * Send SCSI addressing ioctls directly to mid level, send other * ioctls to block level and then onto mid level if they can't be @@ -729,42 +705,13 @@ static int sd_issue_flush(struct device *dev, sector_t *error_sector) return ret; } -static void sd_end_flush(request_queue_t *q, struct request *flush_rq) +static void sd_prepare_flush(request_queue_t *q, struct request *rq) { - struct request *rq = flush_rq->end_io_data; - struct scsi_cmnd *cmd = rq->special; - unsigned int bytes = rq->hard_nr_sectors << 9; - - if (!flush_rq->errors) { - spin_unlock(q->queue_lock); - scsi_io_completion(cmd, bytes, 0); - spin_lock(q->queue_lock); - } else if (blk_barrier_postflush(rq)) { - spin_unlock(q->queue_lock); - scsi_io_completion(cmd, 0, bytes); - spin_lock(q->queue_lock); - } else { - /* - * force journal abort of barriers - */ - end_that_request_first(rq, -EOPNOTSUPP, rq->hard_nr_sectors); - end_that_request_last(rq); - } -} - -static int sd_prepare_flush(request_queue_t *q, struct request *rq) -{ - struct scsi_device *sdev = q->queuedata; - struct scsi_disk *sdkp = dev_get_drvdata(&sdev->sdev_gendev); - - if (!sdkp || !sdkp->WCE) - return 0; - memset(rq->cmd, 0, sizeof(rq->cmd)); - rq->flags |= REQ_BLOCK_PC | REQ_SOFTBARRIER; + rq->flags |= REQ_BLOCK_PC; rq->timeout = SD_TIMEOUT; rq->cmd[0] = SYNCHRONIZE_CACHE; - return 1; + rq->cmd_len = 10; } static void sd_rescan(struct device *dev) @@ -818,6 +765,7 @@ static struct block_device_operations sd_fops = { .open = sd_open, .release = sd_release, .ioctl = sd_ioctl, + .getgeo = sd_getgeo, #ifdef CONFIG_COMPAT .compat_ioctl = sd_compat_ioctl, #endif @@ -865,15 +813,7 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt) relatively rare error condition, no care is taken to avoid unnecessary additional work such as memcpy's that could be avoided. */ - - /* - * If SG_IO from block layer then set good_bytes to stop retries; - * else if errors, check them, and if necessary prepare for - * (partial) retries. - */ - if (blk_pc_request(SCpnt->request)) - good_bytes = this_count; - else if (driver_byte(result) != 0 && + if (driver_byte(result) != 0 && sense_valid && !sense_deferred) { switch (sshdr.sense_key) { case MEDIUM_ERROR: @@ -1427,10 +1367,18 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname, sdkp->RCD = 0; } + sdkp->DPOFUA = (data.device_specific & 0x10) != 0; + if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { + printk(KERN_NOTICE "SCSI device %s: uses " + "READ/WRITE(6), disabling FUA\n", diskname); + sdkp->DPOFUA = 0; + } + ct = sdkp->RCD + 2*sdkp->WCE; - printk(KERN_NOTICE "SCSI device %s: drive cache: %s\n", - diskname, types[ct]); + printk(KERN_NOTICE "SCSI device %s: drive cache: %s%s\n", + diskname, types[ct], + sdkp->DPOFUA ? " w/ FUA" : ""); return; } @@ -1462,6 +1410,7 @@ static int sd_revalidate_disk(struct gendisk *disk) struct scsi_disk *sdkp = scsi_disk(disk); struct scsi_device *sdp = sdkp->device; unsigned char *buffer; + unsigned ordered; SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name)); @@ -1498,7 +1447,21 @@ static int sd_revalidate_disk(struct gendisk *disk) sd_read_write_protect_flag(sdkp, disk->disk_name, buffer); sd_read_cache_type(sdkp, disk->disk_name, buffer); } - + + /* + * We now have all cache related info, determine how we deal + * with ordered requests. Note that as the current SCSI + * dispatch function can alter request order, we cannot use + * QUEUE_ORDERED_TAG_* even when ordered tag is supported. + */ + if (sdkp->WCE) + ordered = sdkp->DPOFUA + ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; + else + ordered = QUEUE_ORDERED_DRAIN; + + blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); + set_capacity(disk, sdkp->capacity); kfree(buffer); @@ -1598,6 +1561,7 @@ static int sd_probe(struct device *dev) strcpy(gd->devfs_name, sdp->devfs_name); gd->private_data = &sdkp->driver; + gd->queue = sdkp->device->request_queue; sd_revalidate_disk(gd); @@ -1605,7 +1569,6 @@ static int sd_probe(struct device *dev) gd->flags = GENHD_FL_DRIVERFS; if (sdp->removable) gd->flags |= GENHD_FL_REMOVABLE; - gd->queue = sdkp->device->request_queue; dev_set_drvdata(dev, sdkp); add_disk(gd); @@ -1641,10 +1604,10 @@ static int sd_remove(struct device *dev) del_gendisk(sdkp->disk); sd_shutdown(dev); - down(&sd_ref_sem); + mutex_lock(&sd_ref_mutex); dev_set_drvdata(dev, NULL); kref_put(&sdkp->kref, scsi_disk_release); - up(&sd_ref_sem); + mutex_unlock(&sd_ref_mutex); return 0; } @@ -1653,7 +1616,7 @@ static int sd_remove(struct device *dev) * scsi_disk_release - Called to free the scsi_disk structure * @kref: pointer to embedded kref * - * sd_ref_sem must be held entering this routine. Because it is + * sd_ref_mutex must be held entering this routine. Because it is * called on last put, you should always use the scsi_disk_get() * scsi_disk_put() helpers which manipulate the semaphore directly * and never do a direct kref_put().