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path: root/drivers/scsi/sd.c
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Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c126
1 files changed, 84 insertions, 42 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index cc8a1d1d915..8e2e893db9e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -46,6 +46,7 @@
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/delay.h>
+#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/string_helpers.h>
#include <linux/async.h>
@@ -411,54 +412,85 @@ static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
}
/**
- * sd_prepare_discard - unmap blocks on thinly provisioned device
+ * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
+ * @sdp: scsi device to operate one
* @rq: Request to prepare
*
* Will issue either UNMAP or WRITE SAME(16) depending on preference
* indicated by target device.
**/
-static int sd_prepare_discard(struct request *rq)
+static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
{
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
struct bio *bio = rq->bio;
sector_t sector = bio->bi_sector;
- unsigned int num = bio_sectors(bio);
+ unsigned int nr_sectors = bio_sectors(bio);
+ unsigned int len;
+ int ret;
+ struct page *page;
if (sdkp->device->sector_size == 4096) {
sector >>= 3;
- num >>= 3;
+ nr_sectors >>= 3;
}
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = SD_TIMEOUT;
memset(rq->cmd, 0, rq->cmd_len);
+ page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
+ if (!page)
+ return BLKPREP_DEFER;
+
if (sdkp->unmap) {
- char *buf = kmap_atomic(bio_page(bio), KM_USER0);
+ char *buf = page_address(page);
+ rq->cmd_len = 10;
rq->cmd[0] = UNMAP;
rq->cmd[8] = 24;
- rq->cmd_len = 10;
-
- /* Ensure that data length matches payload */
- rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24;
put_unaligned_be16(6 + 16, &buf[0]);
put_unaligned_be16(16, &buf[2]);
put_unaligned_be64(sector, &buf[8]);
- put_unaligned_be32(num, &buf[16]);
+ put_unaligned_be32(nr_sectors, &buf[16]);
- kunmap_atomic(buf, KM_USER0);
+ len = 24;
} else {
+ rq->cmd_len = 16;
rq->cmd[0] = WRITE_SAME_16;
rq->cmd[1] = 0x8; /* UNMAP */
put_unaligned_be64(sector, &rq->cmd[2]);
- put_unaligned_be32(num, &rq->cmd[10]);
- rq->cmd_len = 16;
+ put_unaligned_be32(nr_sectors, &rq->cmd[10]);
+
+ len = sdkp->device->sector_size;
}
- return BLKPREP_OK;
+ blk_add_request_payload(rq, page, len);
+ ret = scsi_setup_blk_pc_cmnd(sdp, rq);
+ rq->buffer = page_address(page);
+ if (ret != BLKPREP_OK) {
+ __free_page(page);
+ rq->buffer = NULL;
+ }
+ return ret;
+}
+
+static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
+{
+ rq->timeout = SD_TIMEOUT;
+ rq->retries = SD_MAX_RETRIES;
+ rq->cmd[0] = SYNCHRONIZE_CACHE;
+ rq->cmd_len = 10;
+
+ return scsi_setup_blk_pc_cmnd(sdp, rq);
+}
+
+static void sd_unprep_fn(struct request_queue *q, struct request *rq)
+{
+ if (rq->cmd_flags & REQ_DISCARD) {
+ free_page((unsigned long)rq->buffer);
+ rq->buffer = NULL;
+ }
}
/**
@@ -485,10 +517,13 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
* Discard request come in as REQ_TYPE_FS but we turn them into
* block PC requests to make life easier.
*/
- if (blk_discard_rq(rq))
- ret = sd_prepare_discard(rq);
-
- if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
+ if (rq->cmd_flags & REQ_DISCARD) {
+ ret = scsi_setup_discard_cmnd(sdp, rq);
+ goto out;
+ } else if (rq->cmd_flags & REQ_FLUSH) {
+ ret = scsi_setup_flush_cmnd(sdp, rq);
+ goto out;
+ } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
goto out;
} else if (rq->cmd_type != REQ_TYPE_FS) {
@@ -636,7 +671,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
SCpnt->cmnd[7] = 0x18;
SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
- SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
+ SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
/* LBA */
SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
@@ -661,7 +696,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
} else if (block > 0xffffffff) {
SCpnt->cmnd[0] += READ_16 - READ_6;
- SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
+ SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 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;
@@ -682,7 +717,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
this_count = 0xffff;
SCpnt->cmnd[0] += READ_10 - READ_6;
- SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
+ SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 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;
@@ -691,7 +726,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
} else {
- if (unlikely(blk_fua_rq(rq))) {
+ if (unlikely(rq->cmd_flags & REQ_FUA)) {
/*
* This happens only if this drive failed
* 10byte rw command with ILLEGAL_REQUEST
@@ -745,6 +780,8 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
* or from within the kernel (e.g. as a result of a mount(1) ).
* In the latter case @inode and @filp carry an abridged amount
* of information as noted above.
+ *
+ * Locking: called with bdev->bd_mutex held.
**/
static int sd_open(struct block_device *bdev, fmode_t mode)
{
@@ -799,7 +836,7 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
if (!scsi_device_online(sdev))
goto error_out;
- if (!sdkp->openers++ && sdev->removable) {
+ if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
if (scsi_block_when_processing_errors(sdev))
scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
}
@@ -823,6 +860,8 @@ error_autopm:
*
* Note: may block (uninterruptible) if error recovery is underway
* on this disk.
+ *
+ * Locking: called with bdev->bd_mutex held.
**/
static int sd_release(struct gendisk *disk, fmode_t mode)
{
@@ -831,7 +870,7 @@ static int sd_release(struct gendisk *disk, fmode_t mode)
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
- if (!--sdkp->openers && sdev->removable) {
+ if (atomic_dec_return(&sdkp->openers) && sdev->removable) {
if (scsi_block_when_processing_errors(sdev))
scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
}
@@ -904,7 +943,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
error = scsi_nonblockable_ioctl(sdp, cmd, p,
(mode & FMODE_NDELAY) != 0);
if (!scsi_block_when_processing_errors(sdp) || !error)
- return error;
+ goto out;
/*
* Send SCSI addressing ioctls directly to mid level, send other
@@ -914,13 +953,17 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
switch (cmd) {
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
- return scsi_ioctl(sdp, cmd, p);
+ error = scsi_ioctl(sdp, cmd, p);
+ break;
default:
error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
if (error != -ENOTTY)
- return error;
+ break;
+ error = scsi_ioctl(sdp, cmd, p);
+ break;
}
- return scsi_ioctl(sdp, cmd, p);
+out:
+ return error;
}
static void set_media_not_present(struct scsi_disk *sdkp)
@@ -1045,15 +1088,6 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
return 0;
}
-static void sd_prepare_flush(struct request_queue *q, struct request *rq)
-{
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
- rq->timeout = SD_TIMEOUT;
- rq->retries = SD_MAX_RETRIES;
- rq->cmd[0] = SYNCHRONIZE_CACHE;
- rq->cmd_len = 10;
-}
-
static void sd_rescan(struct device *dev)
{
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
@@ -1103,7 +1137,7 @@ static const struct block_device_operations sd_fops = {
.owner = THIS_MODULE,
.open = sd_open,
.release = sd_release,
- .locked_ioctl = sd_ioctl,
+ .ioctl = sd_ioctl,
.getgeo = sd_getgeo,
#ifdef CONFIG_COMPAT
.compat_ioctl = sd_compat_ioctl,
@@ -1120,7 +1154,7 @@ static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
u64 bad_lba;
int info_valid;
- if (!blk_fs_request(scmd->request))
+ if (scmd->request->cmd_type != REQ_TYPE_FS)
return 0;
info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
@@ -1171,6 +1205,12 @@ static int sd_done(struct scsi_cmnd *SCpnt)
int sense_valid = 0;
int sense_deferred = 0;
+ if (SCpnt->request->cmd_flags & REQ_DISCARD) {
+ if (!result)
+ scsi_set_resid(SCpnt, 0);
+ return good_bytes;
+ }
+
if (result) {
sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
if (sense_valid)
@@ -2121,7 +2161,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
else
ordered = QUEUE_ORDERED_DRAIN;
- blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
+ blk_queue_ordered(sdkp->disk->queue, ordered);
set_capacity(disk, sdkp->capacity);
kfree(buffer);
@@ -2234,6 +2274,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
sd_revalidate_disk(gd);
blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
+ blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
gd->driverfs_dev = &sdp->sdev_gendev;
gd->flags = GENHD_FL_EXT_DEVT;
@@ -2313,7 +2354,7 @@ static int sd_probe(struct device *dev)
sdkp->driver = &sd_template;
sdkp->disk = gd;
sdkp->index = index;
- sdkp->openers = 0;
+ atomic_set(&sdkp->openers, 0);
sdkp->previous_state = 1;
if (!sdp->request_queue->rq_timeout) {
@@ -2372,6 +2413,7 @@ static int sd_remove(struct device *dev)
async_synchronize_full();
blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
+ blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
device_del(&sdkp->dev);
del_gendisk(sdkp->disk);
sd_shutdown(dev);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-23 23:06:02 +0000