[PATCH 34/35] block: add QUEUE_FLAGs for flush and fua

From: mchristi
Date: Wed Feb 24 2016 - 14:50:09 EST

From: Mike Christie <mchristi@xxxxxxxxxx>

The last patch added a REQ_OP_FLUSH for request_fn drivers
and the next patch renames REQ_FLUSH to REQ_PREFLUSH which
will be used by file systems and make_request_fn drivers.

This leaves REQ_FLUSH/REQ_FUA defined for drivers to tell
the block layer if flush/fua is supported. The names are
confusing and I bet will will accidentally be used by
people to request flushes. To avoid that, this patch adds
QUEUE_FLAGs for flush and fua which drivers will use to
indicate what they support.

v2:

1. Fix kbuild failures. Forgot to update ubd driver.

v3:

1. Rename dm_table_supports_flush callout function argument to
callout_fn.

Signed-off-by: Mike Christie <mchristi@xxxxxxxxxx>
---
arch/um/drivers/ubd_kern.c | 2 +-
block/blk-core.c | 3 +-
block/blk-flush.c | 12 ++++----
block/blk-settings.c | 20 --------------
drivers/block/drbd/drbd_main.c | 3 +-
drivers/block/loop.c | 2 +-
drivers/block/mtip32xx/mtip32xx.c | 3 +-
drivers/block/nbd.c | 6 ++--
drivers/block/osdblk.c | 2 +-
drivers/block/ps3disk.c | 2 +-
drivers/block/skd_main.c | 3 +-
drivers/block/virtio_blk.c | 4 +--
drivers/block/xen-blkback/xenbus.c | 2 +-
drivers/block/xen-blkfront.c | 55 ++++++++++++++++++++++---------------
drivers/ide/ide-disk.c | 6 ++--
drivers/md/bcache/super.c | 4 +--
drivers/md/dm-table.c | 32 +++++++++++++--------
drivers/md/md.c | 3 +-
drivers/md/raid5-cache.c | 3 +-
drivers/mmc/card/block.c | 3 +-
drivers/mtd/mtd_blkdevs.c | 2 +-
drivers/nvme/host/core.c | 6 ++--
drivers/scsi/sd.c | 13 +++++----
drivers/target/target_core_iblock.c | 6 ++--
include/linux/blkdev.h | 6 ++--
25 files changed, 108 insertions(+), 95 deletions(-)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index a7dc382..44380d6 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -862,7 +862,7 @@ static int ubd_add(int n, char **error_out)
goto out;
}
ubd_dev->queue->queuedata = ubd_dev;
- blk_queue_flush(ubd_dev->queue, REQ_FLUSH);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, ubd_dev->queue);

blk_queue_max_segments(ubd_dev->queue, MAX_SG);
err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]);
diff --git a/block/blk-core.c b/block/blk-core.c
index 5436c19..8640b35 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1968,7 +1968,8 @@ generic_make_request_checks(struct bio *bio)
* drivers without flush support don't have to worry
* about them.
*/
- if ((bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && !q->flush_flags) {
+ if ((bio->bi_rw & (REQ_FLUSH | REQ_FUA)) &&
+ !(blk_queue_flush(q) || blk_queue_fua(q))) {
bio->bi_rw &= ~(REQ_FLUSH | REQ_FUA);
if (!nr_sectors) {
err = 0;
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 070d7c7..e07ca6c 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -95,17 +95,18 @@ enum {
static bool blk_kick_flush(struct request_queue *q,
struct blk_flush_queue *fq);

-static unsigned int blk_flush_policy(unsigned int fflags, struct request *rq)
+static unsigned int blk_flush_policy(struct request *rq)
{
+ struct request_queue *q = rq->q;
unsigned int policy = 0;

if (blk_rq_sectors(rq))
policy |= REQ_FSEQ_DATA;

- if (fflags & REQ_FLUSH) {
+ if (blk_queue_flush(q)) {
if (rq->cmd_flags & REQ_FLUSH)
policy |= REQ_FSEQ_PREFLUSH;
- if (!(fflags & REQ_FUA) && (rq->cmd_flags & REQ_FUA))
+ if (!blk_queue_fua(q) && (rq->cmd_flags & REQ_FUA))
policy |= REQ_FSEQ_POSTFLUSH;
}
return policy;
@@ -385,8 +386,7 @@ static void mq_flush_data_end_io(struct request *rq, int error)
void blk_insert_flush(struct request *rq)
{
struct request_queue *q = rq->q;
- unsigned int fflags = q->flush_flags; /* may change, cache */
- unsigned int policy = blk_flush_policy(fflags, rq);
+ unsigned int policy = blk_flush_policy(rq);
struct blk_flush_queue *fq = blk_get_flush_queue(q, rq->mq_ctx);

/*
@@ -394,7 +394,7 @@ void blk_insert_flush(struct request *rq)
* REQ_FLUSH and FUA for the driver.
*/
rq->cmd_flags &= ~REQ_FLUSH;
- if (!(fflags & REQ_FUA))
+ if (!blk_queue_fua(q))
rq->cmd_flags &= ~REQ_FUA;

/*
diff --git a/block/blk-settings.c b/block/blk-settings.c
index c7bb666..77dd6da 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -820,26 +820,6 @@ void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
}
EXPORT_SYMBOL(blk_queue_update_dma_alignment);

-/**
- * blk_queue_flush - configure queue's cache flush capability
- * @q: the request queue for the device
- * @flush: 0, REQ_FLUSH or REQ_FLUSH | REQ_FUA
- *
- * Tell block layer cache flush capability of @q. If it supports
- * flushing, REQ_FLUSH should be set. If it supports bypassing
- * write cache for individual writes, REQ_FUA should be set.
- */
-void blk_queue_flush(struct request_queue *q, unsigned int flush)
-{
- WARN_ON_ONCE(flush & ~(REQ_FLUSH | REQ_FUA));
-
- if (WARN_ON_ONCE(!(flush & REQ_FLUSH) && (flush & REQ_FUA)))
- flush &= ~REQ_FUA;
-
- q->flush_flags = flush & (REQ_FLUSH | REQ_FUA);
-}
-EXPORT_SYMBOL_GPL(blk_queue_flush);
-
void blk_queue_flush_queueable(struct request_queue *q, bool queueable)
{
q->flush_not_queueable = !queueable;
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 3a93fd2..5dd30a5 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2762,7 +2762,8 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
q->backing_dev_info.congested_data = device;

blk_queue_make_request(q, drbd_make_request);
- blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, q);
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, q);
/* Setting the max_hw_sectors to an odd value of 8kibyte here
This triggers a max_bio_size message upon first attach or connect */
blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index a3d1293..297a91f 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -937,7 +937,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
mapping_set_gfp_mask(mapping, lo->old_gfp_mask & ~(__GFP_IO|__GFP_FS));

if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync)
- blk_queue_flush(lo->lo_queue, REQ_FLUSH);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, lo->lo_queue);

loop_update_dio(lo);
set_capacity(lo->lo_disk, size);
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 3995a9e..0c41ce4 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3910,7 +3910,8 @@ skip_create_disk:
* write back cache is not supported in the device. FUA depends on
* write back cache support, hence setting flush support to zero.
*/
- blk_queue_flush(dd->queue, 0);
+ queue_flag_clear_unlocked(QUEUE_FLAG_FLUSH, dd->queue);
+ queue_flag_clear_unlocked(QUEUE_FLAG_FUA, dd->queue);

/* Signal trim support */
if (dd->trim_supp == true) {
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 3b4be71..f6bda16 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -750,9 +750,11 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
nbd->disk->queue);
if (nbd->flags & NBD_FLAG_SEND_FLUSH)
- blk_queue_flush(nbd->disk->queue, REQ_FLUSH);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH,
+ nbd->disk->queue);
else
- blk_queue_flush(nbd->disk->queue, 0);
+ queue_flag_clear_unlocked(QUEUE_FLAG_FLUSH,
+ nbd->disk->queue);

thread = kthread_run(nbd_thread_send, nbd, "%s",
nbd_name(nbd));
diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
index 3f8a0a0..d03f06a 100644
--- a/drivers/block/osdblk.c
+++ b/drivers/block/osdblk.c
@@ -437,7 +437,7 @@ static int osdblk_init_disk(struct osdblk_device *osdev)
blk_queue_stack_limits(q, osd_request_queue(osdev->osd));

blk_queue_prep_rq(q, blk_queue_start_tag);
- blk_queue_flush(q, REQ_FLUSH);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, q);

disk->queue = q;

diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index 95c524b..5985fdc 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -468,7 +468,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev)
blk_queue_dma_alignment(queue, dev->blk_size-1);
blk_queue_logical_block_size(queue, dev->blk_size);

- blk_queue_flush(queue, REQ_FLUSH);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, queue);

blk_queue_max_segments(queue, -1);
blk_queue_max_segment_size(queue, dev->bounce_size);
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c
index a15cc2e..68d0e22 100644
--- a/drivers/block/skd_main.c
+++ b/drivers/block/skd_main.c
@@ -4409,7 +4409,8 @@ static int skd_cons_disk(struct skd_device *skdev)
disk->queue = q;
q->queuedata = skdev;

- blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, q);
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, q);
blk_queue_max_segments(q, skdev->sgs_per_request);
blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index c6d3bc2..b8a508b 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -489,9 +489,9 @@ static void virtblk_update_cache_mode(struct virtio_device *vdev)
struct virtio_blk *vblk = vdev->priv;

if (writeback)
- blk_queue_flush(vblk->disk->queue, REQ_FLUSH);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, vblk->disk->queue);
else
- blk_queue_flush(vblk->disk->queue, 0);
+ queue_flag_clear_unlocked(QUEUE_FLAG_FLUSH, vblk->disk->queue);

revalidate_disk(vblk->disk);
}
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 876763f..4a8663c 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -478,7 +478,7 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
vbd->type |= VDISK_REMOVABLE;

q = bdev_get_queue(bdev);
- if (q && q->flush_flags)
+ if (q && (blk_queue_flush(q) || blk_queue_fua(q)))
vbd->flush_support = true;

if (q && blk_queue_secdiscard(q))
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 55f795d..356887b 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -194,6 +194,7 @@ struct blkfront_info
unsigned int nr_ring_pages;
struct request_queue *rq;
unsigned int feature_flush;
+ unsigned int feature_fua;
unsigned int feature_discard:1;
unsigned int feature_secdiscard:1;
unsigned int discard_granularity;
@@ -761,19 +762,15 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
* implement it the same way. (It's also a FLUSH+FUA,
* since it is guaranteed ordered WRT previous writes.)
*/
- switch (info->feature_flush &
- ((REQ_FLUSH|REQ_FUA))) {
- case REQ_FLUSH|REQ_FUA:
+ if (blk_queue_flush(info->rq) &&
+ blk_queue_fua(info->rq))
ring_req->operation =
BLKIF_OP_WRITE_BARRIER;
- break;
- case REQ_FLUSH:
+ else if (blk_queue_flush(info->rq))
ring_req->operation =
BLKIF_OP_FLUSH_DISKCACHE;
- break;
- default:
+ else
ring_req->operation = 0;
- }
}
ring_req->u.rw.nr_segments = num_grant;
if (unlikely(require_extra_req)) {
@@ -864,9 +861,9 @@ static inline bool blkif_request_flush_invalid(struct request *req,
{
return ((req->cmd_type != REQ_TYPE_FS) ||
((req->op == REQ_OP_FLUSH) &&
- !(info->feature_flush & REQ_FLUSH)) ||
+ !(blk_queue_flush(info->rq))) ||
((req->cmd_flags & REQ_FUA) &&
- !(info->feature_flush & REQ_FUA)));
+ !(blk_queue_fua(info->rq))));
}

static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
@@ -983,23 +980,30 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
return 0;
}

-static const char *flush_info(unsigned int feature_flush)
+static const char *flush_info(struct blkfront_info *info)
{
- switch (feature_flush & ((REQ_FLUSH | REQ_FUA))) {
- case REQ_FLUSH|REQ_FUA:
+ if (blk_queue_flush(info->rq) && blk_queue_fua(info->rq))
return "barrier: enabled;";
- case REQ_FLUSH:
+ else if (blk_queue_flush(info->rq))
return "flush diskcache: enabled;";
- default:
+ else
return "barrier or flush: disabled;";
- }
}

static void xlvbd_flush(struct blkfront_info *info)
{
- blk_queue_flush(info->rq, info->feature_flush);
+ if (info->feature_flush)
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, info->rq);
+ else
+ queue_flag_clear_unlocked(QUEUE_FLAG_FLUSH, info->rq);
+
+ if (info->feature_fua)
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, info->rq);
+ else
+ queue_flag_clear_unlocked(QUEUE_FLAG_FUA, info->rq);
+
pr_info("blkfront: %s: %s %s %s %s %s\n",
- info->gd->disk_name, flush_info(info->feature_flush),
+ info->gd->disk_name, flush_info(info),
"persistent grants:", info->feature_persistent ?
"enabled;" : "disabled;", "indirect descriptors:",
info->max_indirect_segments ? "enabled;" : "disabled;");
@@ -1618,6 +1622,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
if (unlikely(error)) {
if (error == -EOPNOTSUPP)
error = 0;
+ info->feature_fua = 0;
info->feature_flush = 0;
xlvbd_flush(info);
}
@@ -2312,6 +2317,7 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
unsigned int indirect_segments;

info->feature_flush = 0;
+ info->feature_fua = 0;

err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-barrier", "%d", &barrier,
@@ -2324,8 +2330,11 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
*
* If there are barriers, then we use flush.
*/
- if (!err && barrier)
- info->feature_flush = REQ_FLUSH | REQ_FUA;
+ if (!err && barrier) {
+ info->feature_flush = 1;
+ info->feature_fua = 1;
+ }
+
/*
* And if there is "feature-flush-cache" use that above
* barriers.
@@ -2334,8 +2343,10 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
"feature-flush-cache", "%d", &flush,
NULL);

- if (!err && flush)
- info->feature_flush = REQ_FLUSH;
+ if (!err && flush) {
+ info->feature_flush = 1;
+ info->feature_fua = 0;
+ }

err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-discard", "%d", &discard,
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 6474ed3..4501ca7 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -522,8 +522,8 @@ static int ide_do_setfeature(ide_drive_t *drive, u8 feature, u8 nsect)
static void update_flush(ide_drive_t *drive)
{
u16 *id = drive->id;
- unsigned flush = 0;

+ queue_flag_clear_unlocked(QUEUE_FLAG_FLUSH, drive->queue);
if (drive->dev_flags & IDE_DFLAG_WCACHE) {
unsigned long long capacity;
int barrier;
@@ -546,12 +546,10 @@ static void update_flush(ide_drive_t *drive)
drive->name, barrier ? "" : "not ");

if (barrier) {
- flush = REQ_FLUSH;
blk_queue_prep_rq(drive->queue, idedisk_prep_fn);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, drive->queue);
}
}
-
- blk_queue_flush(drive->queue, flush);
}

ide_devset_get_flag(wcache, IDE_DFLAG_WCACHE);
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index b11f7f4..3d75a0f 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -820,8 +820,8 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
clear_bit(QUEUE_FLAG_ADD_RANDOM, &d->disk->queue->queue_flags);
set_bit(QUEUE_FLAG_DISCARD, &d->disk->queue->queue_flags);

- blk_queue_flush(q, REQ_FLUSH|REQ_FUA);
-
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, q);
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, q);
return 0;
}

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 7210e53..1ce40cf 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1336,13 +1336,21 @@ static void dm_table_verify_integrity(struct dm_table *t)
static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
- unsigned flush = (*(unsigned *)data);
struct request_queue *q = bdev_get_queue(dev->bdev);

- return q && (q->flush_flags & flush);
+ return q && blk_queue_flush(q);
}

-static bool dm_table_supports_flush(struct dm_table *t, unsigned flush)
+static int device_fua_capable(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t len, void *data)
+{
+ struct request_queue *q = bdev_get_queue(dev->bdev);
+
+ return q && blk_queue_fua(q);
+}
+
+static bool dm_table_supports_flush(struct dm_table *t,
+ iterate_devices_callout_fn callout_fn)
{
struct dm_target *ti;
unsigned i = 0;
@@ -1363,7 +1371,7 @@ static bool dm_table_supports_flush(struct dm_table *t, unsigned flush)
return true;

if (ti->type->iterate_devices &&
- ti->type->iterate_devices(ti, device_flush_capable, &flush))
+ ti->type->iterate_devices(ti, callout_fn, NULL))
return true;
}

@@ -1494,8 +1502,6 @@ static bool dm_table_supports_discards(struct dm_table *t)
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
- unsigned flush = 0;
-
/*
* Copy table's limits to the DM device's request_queue
*/
@@ -1506,12 +1512,14 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
else
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);

- if (dm_table_supports_flush(t, REQ_FLUSH)) {
- flush |= REQ_FLUSH;
- if (dm_table_supports_flush(t, REQ_FUA))
- flush |= REQ_FUA;
- }
- blk_queue_flush(q, flush);
+ if (dm_table_supports_flush(t, device_flush_capable)) {
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, q);
+ if (dm_table_supports_flush(t, device_fua_capable))
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, q);
+ else
+ queue_flag_clear_unlocked(QUEUE_FLAG_FUA, q);
+ } else
+ queue_flag_clear_unlocked(QUEUE_FLAG_FLUSH, q);

if (!dm_table_discard_zeroes_data(t))
q->limits.discard_zeroes_data = 0;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8cdd37f..f0604a0 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5040,7 +5040,8 @@ static int md_alloc(dev_t dev, char *name)
disk->fops = &md_fops;
disk->private_data = mddev;
disk->queue = mddev->queue;
- blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, mddev->queue);
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, mddev->queue);
/* Allow extended partitions. This makes the
* 'mdp' device redundant, but we can't really
* remove it now.
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index da07670..3d88b55 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -1196,6 +1196,7 @@ ioerr:

int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev)
{
+ struct request_queue *q = rdev->bdev->bd_disk->queue;
struct r5l_log *log;

if (PAGE_SIZE != 4096)
@@ -1205,7 +1206,7 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev)
return -ENOMEM;
log->rdev = rdev;

- log->need_cache_flush = (rdev->bdev->bd_disk->queue->flush_flags != 0);
+ log->need_cache_flush = (blk_queue_flush(q) || blk_queue_fua(q));

log->uuid_checksum = crc32c_le(~0, rdev->mddev->uuid,
sizeof(rdev->mddev->uuid));
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index dabd152..bd504b4 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -2276,7 +2276,8 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
card->ext_csd.rel_sectors)) {
md->flags |= MMC_BLK_REL_WR;
- blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, md->queue.queue);
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, md->queue.queue);
}

if (mmc_card_mmc(card) &&
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 67da1cd..4462627 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -409,7 +409,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
goto error3;

if (tr->flush)
- blk_queue_flush(new->rq, REQ_FLUSH);
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, new->rq);

new->rq->queuedata = new;
blk_queue_logical_block_size(new->rq, tr->blksize);
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 504a604..bba850d 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1177,8 +1177,10 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
}
if (ctrl->stripe_size)
blk_queue_chunk_sectors(ns->queue, ctrl->stripe_size >> 9);
- if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
- blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA);
+ if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) {
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, ns->queue);
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, ns->queue);
+ }
blk_queue_virt_boundary(ns->queue, ctrl->page_size - 1);

disk->major = nvme_major;
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 6882ab7..7aedac3 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -137,15 +137,18 @@ static const char *sd_cache_types[] = {

static void sd_set_flush_flag(struct scsi_disk *sdkp)
{
- unsigned flush = 0;
+ struct request_queue *q = sdkp->disk->queue;

if (sdkp->WCE) {
- flush |= REQ_FLUSH;
+ queue_flag_set_unlocked(QUEUE_FLAG_FLUSH, q);
if (sdkp->DPOFUA)
- flush |= REQ_FUA;
+ queue_flag_set_unlocked(QUEUE_FLAG_FUA, q);
+ else
+ queue_flag_clear_unlocked(QUEUE_FLAG_FUA, q);
+ } else {
+ queue_flag_clear_unlocked(QUEUE_FLAG_FUA, q);
+ queue_flag_clear_unlocked(QUEUE_FLAG_FLUSH, q);
}
-
- blk_queue_flush(sdkp->disk->queue, flush);
}

static ssize_t
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 8d3d197..c9c07e3 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -659,11 +659,11 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
* Force writethrough using WRITE_FUA if a volatile write cache
* is not enabled, or if initiator set the Force Unit Access bit.
*/
- if (q->flush_flags & REQ_FUA) {
+ if (blk_queue_fua(q)) {
if (cmd->se_cmd_flags & SCF_FUA) {
op = REQ_OP_WRITE;
op_flags = WRITE_FUA;
- } else if (!(q->flush_flags & REQ_FLUSH)) {
+ } else if (!blk_queue_flush(q)) {
op = REQ_OP_WRITE;
op_flags = WRITE_FUA;
} else {
@@ -812,7 +812,7 @@ static bool iblock_get_write_cache(struct se_device *dev)
struct block_device *bd = ib_dev->ibd_bd;
struct request_queue *q = bdev_get_queue(bd);

- return q->flush_flags & REQ_FLUSH;
+ return blk_queue_flush(q);
}

static const struct target_backend_ops iblock_ops = {
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 9c36ffc..663e3aa 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -434,7 +434,6 @@ struct request_queue {
/*
* for flush operations
*/
- unsigned int flush_flags;
unsigned int flush_not_queueable:1;
struct blk_flush_queue *fq;

@@ -492,6 +491,8 @@ struct request_queue {
#define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
#define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
#define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
+#define QUEUE_FLAG_FLUSH 23 /* supports FLUSH/PREFLUSH */
+#define QUEUE_FLAG_FUA 24 /* supports FUA */

#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
(1 << QUEUE_FLAG_STACKABLE) | \
@@ -580,6 +581,8 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
#define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
+#define blk_queue_flush(q) test_bit(QUEUE_FLAG_FLUSH, &(q)->queue_flags)
+#define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)

#define blk_noretry_request(rq) \
((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
@@ -1010,7 +1013,6 @@ extern void blk_queue_update_dma_alignment(struct request_queue *, int);
extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
-extern void blk_queue_flush(struct request_queue *q, unsigned int flush);
extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);

--
1.8.3.1