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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

Browse source 
* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  cfq-iosched: Allow RT requests to pre-empt ongoing BE timeslice
  block: add sysfs file for controlling io stats accounting
  Mark mandatory elevator functions in the biodoc.txt
  include/linux: Add bsg.h to the Kernel exported headers
  block: silently error an unsupported barrier bio
  block: Fix documentation for blkdev_issue_flush()
  block: add bio_rw_flagged() for testing bio->bi_rw
  block: seperate bio/request unplug and sync bits
  block: export SSD/non-rotational queue flag through sysfs
  Fix small typo in bio.h's documentation
  block: get rid of the manual directory counting in blktrace
  block: Allow empty integrity profile
  block: Remove obsolete BUG_ON
  block: Don't verify integrity metadata on read error
This commit is contained in:
Linus Torvalds 2009-01-30 08:46:42 -08:00
commit ae704e9f92
11 changed files with 249 additions and 133 deletions
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6
Documentation/block/biodoc.txt
View file

@ -954,14 +954,14 @@ elevator_allow_merge_fn called whenever the block layer determines
results in some sort of conflict internally,
this hook allows it to do that.
elevator_dispatch_fn fills the dispatch queue with ready requests.
elevator_dispatch_fn* fills the dispatch queue with ready requests.
I/O schedulers are free to postpone requests by
not filling the dispatch queue unless @force
is non-zero. Once dispatched, I/O schedulers
are not allowed to manipulate the requests -
they belong to generic dispatch queue.
elevator_add_req_fn called to add a new request into the scheduler
elevator_add_req_fn* called to add a new request into the scheduler
elevator_queue_empty_fn returns true if the merge queue is empty.
Drivers shouldn't use this, but rather check
@ -991,7 +991,7 @@ elevator_activate_req_fn Called when device driver first sees a request.
elevator_deactivate_req_fn Called when device driver decides to delay
a request by requeueing it.
elevator_init_fn
elevator_init_fn*
elevator_exit_fn Allocate and free any elevator specific storage
for a queue.

2
block/blk-barrier.c
View file

@ -302,7 +302,7 @@ static void bio_end_empty_barrier(struct bio *bio, int err)
* Description:
* Issue a flush for the block device in question. Caller can supply
* room for storing the error offset in case of a flush error, if they
* wish to. Caller must run wait_for_completion() on its own.
* wish to.
*/
int blkdev_issue_flush(struct block_device *bdev, sector_t *error_sector)
{

100
block/blk-core.c
View file

@ -64,11 +64,12 @@ static struct workqueue_struct *kblockd_workqueue;
static void drive_stat_acct(struct request *rq, int new_io)
{
struct gendisk *disk = rq->rq_disk;
struct hd_struct *part;
int rw = rq_data_dir(rq);
int cpu;
if (!blk_fs_request(rq) || !rq->rq_disk)
if (!blk_fs_request(rq) || !disk || !blk_queue_io_stat(disk->queue))
return;
cpu = part_stat_lock();
@ -599,8 +600,7 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
q->request_fn = rfn;
q->prep_rq_fn = NULL;
q->unplug_fn = generic_unplug_device;
q->queue_flags = (1 << QUEUE_FLAG_CLUSTER |
1 << QUEUE_FLAG_STACKABLE);
q->queue_flags = QUEUE_FLAG_DEFAULT;
q->queue_lock = lock;
blk_queue_segment_boundary(q, BLK_SEG_BOUNDARY_MASK);
@ -1125,6 +1125,8 @@ void init_request_from_bio(struct request *req, struct bio *bio)
if (bio_sync(bio))
req->cmd_flags |= REQ_RW_SYNC;
if (bio_unplug(bio))
req->cmd_flags |= REQ_UNPLUG;
if (bio_rw_meta(bio))
req->cmd_flags |= REQ_RW_META;
@ -1141,6 +1143,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
int el_ret, nr_sectors;
const unsigned short prio = bio_prio(bio);
const int sync = bio_sync(bio);
const int unplug = bio_unplug(bio);
int rw_flags;
nr_sectors = bio_sectors(bio);
@ -1244,7 +1247,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
blk_plug_device(q);
add_request(q, req);
out:
if (sync || blk_queue_nonrot(q))
if (unplug || blk_queue_nonrot(q))
__generic_unplug_device(q);
spin_unlock_irq(q->queue_lock);
return 0;
@ -1448,6 +1451,11 @@ static inline void __generic_make_request(struct bio *bio)
err = -EOPNOTSUPP;
goto end_io;
}
if (bio_barrier(bio) && bio_has_data(bio) &&
(q->next_ordered == QUEUE_ORDERED_NONE)) {
err = -EOPNOTSUPP;
goto end_io;
}
ret = q->make_request_fn(q, bio);
} while (ret);
@ -1655,6 +1663,55 @@ void blkdev_dequeue_request(struct request *req)
}
EXPORT_SYMBOL(blkdev_dequeue_request);
static void blk_account_io_completion(struct request *req, unsigned int bytes)
{
struct gendisk *disk = req->rq_disk;
if (!disk || !blk_queue_io_stat(disk->queue))
return;
if (blk_fs_request(req)) {
const int rw = rq_data_dir(req);
struct hd_struct *part;
int cpu;
cpu = part_stat_lock();
part = disk_map_sector_rcu(req->rq_disk, req->sector);
part_stat_add(cpu, part, sectors[rw], bytes >> 9);
part_stat_unlock();
}
}
static void blk_account_io_done(struct request *req)
{
struct gendisk *disk = req->rq_disk;
if (!disk || !blk_queue_io_stat(disk->queue))
return;
/*
* Account IO completion. bar_rq isn't accounted as a normal
* IO on queueing nor completion. Accounting the containing
* request is enough.
*/
if (blk_fs_request(req) && req != &req->q->bar_rq) {
unsigned long duration = jiffies - req->start_time;
const int rw = rq_data_dir(req);
struct hd_struct *part;
int cpu;
cpu = part_stat_lock();
part = disk_map_sector_rcu(disk, req->sector);
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_round_stats(cpu, part);
part_dec_in_flight(part);
part_stat_unlock();
}
}
/**
* __end_that_request_first - end I/O on a request
* @req: the request being processed
@ -1690,16 +1747,7 @@ static int __end_that_request_first(struct request *req, int error,
(unsigned long long)req->sector);
}
if (blk_fs_request(req) && req->rq_disk) {
const int rw = rq_data_dir(req);
struct hd_struct *part;
int cpu;
cpu = part_stat_lock();
part = disk_map_sector_rcu(req->rq_disk, req->sector);
part_stat_add(cpu, part, sectors[rw], nr_bytes >> 9);
part_stat_unlock();
}
blk_account_io_completion(req, nr_bytes);
total_bytes = bio_nbytes = 0;
while ((bio = req->bio) != NULL) {
@ -1779,8 +1827,6 @@ static int __end_that_request_first(struct request *req, int error,
*/
static void end_that_request_last(struct request *req, int error)
{
struct gendisk *disk = req->rq_disk;
if (blk_rq_tagged(req))
blk_queue_end_tag(req->q, req);
@ -1792,27 +1838,7 @@ static void end_that_request_last(struct request *req, int error)
blk_delete_timer(req);
/*
* Account IO completion. bar_rq isn't accounted as a normal
* IO on queueing nor completion. Accounting the containing
* request is enough.
*/
if (disk && blk_fs_request(req) && req != &req->q->bar_rq) {
unsigned long duration = jiffies - req->start_time;
const int rw = rq_data_dir(req);
struct hd_struct *part;
int cpu;
cpu = part_stat_lock();
part = disk_map_sector_rcu(disk, req->sector);
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_round_stats(cpu, part);
part_dec_in_flight(part);
part_stat_unlock();
}
blk_account_io_done(req);
if (req->end_io)
req->end_io(req, error);

25
block/blk-integrity.c
View file

@ -309,24 +309,24 @@ static struct kobj_type integrity_ktype = {
/**
* blk_integrity_register - Register a gendisk as being integrity-capable
* @disk: struct gendisk pointer to make integrity-aware
* @template: integrity profile
* @template: optional integrity profile to register
*
* Description: When a device needs to advertise itself as being able
* to send/receive integrity metadata it must use this function to
* register the capability with the block layer. The template is a
* blk_integrity struct with values appropriate for the underlying
* hardware. See Documentation/block/data-integrity.txt.
* hardware. If template is NULL the new profile is allocated but
* not filled out. See Documentation/block/data-integrity.txt.
*/
int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
{
struct blk_integrity *bi;
BUG_ON(disk == NULL);
BUG_ON(template == NULL);
if (disk->integrity == NULL) {
bi = kmem_cache_alloc(integrity_cachep,
GFP_KERNEL | __GFP_ZERO);
GFP_KERNEL | __GFP_ZERO);
if (!bi)
return -1;
@ -346,13 +346,16 @@ int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
bi = disk->integrity;
/* Use the provided profile as template */
bi->name = template->name;
bi->generate_fn = template->generate_fn;
bi->verify_fn = template->verify_fn;
bi->tuple_size = template->tuple_size;
bi->set_tag_fn = template->set_tag_fn;
bi->get_tag_fn = template->get_tag_fn;
bi->tag_size = template->tag_size;
if (template != NULL) {
bi->name = template->name;
bi->generate_fn = template->generate_fn;
bi->verify_fn = template->verify_fn;
bi->tuple_size = template->tuple_size;
bi->set_tag_fn = template->set_tag_fn;
bi->get_tag_fn = template->get_tag_fn;
bi->tag_size = template->tag_size;
} else
bi->name = "unsupported";
return 0;
}

58
block/blk-sysfs.c
View file

@ -130,6 +130,27 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
return queue_var_show(max_hw_sectors_kb, (page));
}
static ssize_t queue_nonrot_show(struct request_queue *q, char *page)
{
return queue_var_show(!blk_queue_nonrot(q), page);
}
static ssize_t queue_nonrot_store(struct request_queue *q, const char *page,
size_t count)
{
unsigned long nm;
ssize_t ret = queue_var_store(&nm, page, count);
spin_lock_irq(q->queue_lock);
if (nm)
queue_flag_clear(QUEUE_FLAG_NONROT, q);
else
queue_flag_set(QUEUE_FLAG_NONROT, q);
spin_unlock_irq(q->queue_lock);
return ret;
}
static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
{
return queue_var_show(blk_queue_nomerges(q), page);
@ -146,8 +167,8 @@ static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
queue_flag_set(QUEUE_FLAG_NOMERGES, q);
else
queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
spin_unlock_irq(q->queue_lock);
return ret;
}
@ -176,6 +197,27 @@ queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
return ret;
}
static ssize_t queue_iostats_show(struct request_queue *q, char *page)
{
return queue_var_show(blk_queue_io_stat(q), page);
}
static ssize_t queue_iostats_store(struct request_queue *q, const char *page,
size_t count)
{
unsigned long stats;
ssize_t ret = queue_var_store(&stats, page, count);
spin_lock_irq(q->queue_lock);
if (stats)
queue_flag_set(QUEUE_FLAG_IO_STAT, q);
else
queue_flag_clear(QUEUE_FLAG_IO_STAT, q);
spin_unlock_irq(q->queue_lock);
return ret;
}
static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
.show = queue_requests_show,
@ -210,6 +252,12 @@ static struct queue_sysfs_entry queue_hw_sector_size_entry = {
.show = queue_hw_sector_size_show,
};
static struct queue_sysfs_entry queue_nonrot_entry = {
.attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
.show = queue_nonrot_show,
.store = queue_nonrot_store,
};
static struct queue_sysfs_entry queue_nomerges_entry = {
.attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
.show = queue_nomerges_show,
@ -222,6 +270,12 @@ static struct queue_sysfs_entry queue_rq_affinity_entry = {
.store = queue_rq_affinity_store,
};
static struct queue_sysfs_entry queue_iostats_entry = {
.attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
.show = queue_iostats_show,
.store = queue_iostats_store,
};
static struct attribute *default_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
@ -229,8 +283,10 @@ static struct attribute *default_attrs[] = {
&queue_max_sectors_entry.attr,
&queue_iosched_entry.attr,
&queue_hw_sector_size_entry.attr,
&queue_nonrot_entry.attr,
&queue_nomerges_entry.attr,
&queue_rq_affinity_entry.attr,
&queue_iostats_entry.attr,
NULL,
};

72
block/blktrace.c
View file

@ -187,59 +187,12 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
static struct dentry *blk_tree_root;
static DEFINE_MUTEX(blk_tree_mutex);
static unsigned int root_users;
static inline void blk_remove_root(void)
{
if (blk_tree_root) {
debugfs_remove(blk_tree_root);
blk_tree_root = NULL;
}
}
static void blk_remove_tree(struct dentry *dir)
{
mutex_lock(&blk_tree_mutex);
debugfs_remove(dir);
if (--root_users == 0)
blk_remove_root();
mutex_unlock(&blk_tree_mutex);
}
static struct dentry *blk_create_tree(const char *blk_name)
{
struct dentry *dir = NULL;
int created = 0;
mutex_lock(&blk_tree_mutex);
if (!blk_tree_root) {
blk_tree_root = debugfs_create_dir("block", NULL);
if (!blk_tree_root)
goto err;
created = 1;
}
dir = debugfs_create_dir(blk_name, blk_tree_root);
if (dir)
root_users++;
else {
/* Delete root only if we created it */
if (created)
blk_remove_root();
}
err:
mutex_unlock(&blk_tree_mutex);
return dir;
}
static void blk_trace_cleanup(struct blk_trace *bt)
{
relay_close(bt->rchan);
debugfs_remove(bt->msg_file);
debugfs_remove(bt->dropped_file);
blk_remove_tree(bt->dir);
relay_close(bt->rchan);
free_percpu(bt->sequence);
free_percpu(bt->msg_data);
kfree(bt);
@ -346,7 +299,18 @@ static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
static int blk_remove_buf_file_callback(struct dentry *dentry)
{
struct dentry *parent = dentry->d_parent;
debugfs_remove(dentry);
/*
* this will fail for all but the last file, but that is ok. what we
* care about is the top level buts->name directory going away, when
* the last trace file is gone. Then we don't have to rmdir() that
* manually on trace stop, so it nicely solves the issue with
* force killing of running traces.
*/
debugfs_remove(parent);
return 0;
}
@ -404,7 +368,15 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
goto err;
ret = -ENOENT;
dir = blk_create_tree(buts->name);
if (!blk_tree_root) {
blk_tree_root = debugfs_create_dir("block", NULL);
if (!blk_tree_root)
return -ENOMEM;
}
dir = debugfs_create_dir(buts->name, blk_tree_root);
if (!dir)
goto err;
@ -458,8 +430,6 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
atomic_dec(&blk_probes_ref);
mutex_unlock(&blk_probe_mutex);
err:
if (dir)
blk_remove_tree(dir);
if (bt) {
if (bt->msg_file)
debugfs_remove(bt->msg_file);

39
block/cfq-iosched.c
View file

@ -84,6 +84,11 @@ struct cfq_data {
*/
struct cfq_rb_root service_tree;
unsigned int busy_queues;
/*
* Used to track any pending rt requests so we can pre-empt current
* non-RT cfqq in service when this value is non-zero.
*/
unsigned int busy_rt_queues;
int rq_in_driver;
int sync_flight;
@ -562,6 +567,8 @@ static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
BUG_ON(cfq_cfqq_on_rr(cfqq));
cfq_mark_cfqq_on_rr(cfqq);
cfqd->busy_queues++;
if (cfq_class_rt(cfqq))
cfqd->busy_rt_queues++;
cfq_resort_rr_list(cfqd, cfqq);
}
@ -581,6 +588,8 @@ static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
BUG_ON(!cfqd->busy_queues);
cfqd->busy_queues--;
if (cfq_class_rt(cfqq))
cfqd->busy_rt_queues--;
}
/*
@ -1004,6 +1013,20 @@ static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd)
if (cfq_slice_used(cfqq))
goto expire;
/*
* If we have a RT cfqq waiting, then we pre-empt the current non-rt
* cfqq.
*/
if (!cfq_class_rt(cfqq) && cfqd->busy_rt_queues) {
/*
* We simulate this as cfqq timed out so that it gets to bank
* the remaining of its time slice.
*/
cfq_log_cfqq(cfqd, cfqq, "preempt");
cfq_slice_expired(cfqd, 1);
goto new_queue;
}
/*
* The active queue has requests and isn't expired, allow it to
* dispatch.
@ -1067,6 +1090,13 @@ __cfq_dispatch_requests(struct cfq_data *cfqd, struct cfq_queue *cfqq,
if (RB_EMPTY_ROOT(&cfqq->sort_list))
break;
/*
* If there is a non-empty RT cfqq waiting for current
* cfqq's timeslice to complete, pre-empt this cfqq
*/
if (!cfq_class_rt(cfqq) && cfqd->busy_rt_queues)
break;
} while (dispatched < max_dispatch);
/*
@ -1801,6 +1831,12 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
if (rq_is_meta(rq) && !cfqq->meta_pending)
return 1;
/*
* Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice.
*/
if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq))
return 1;
if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq))
return 0;
@ -1870,7 +1906,8 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
/*
* not the active queue - expire current slice if it is
* idle and has expired it's mean thinktime or this new queue
* has some old slice time left and is of higher priority
* has some old slice time left and is of higher priority or
* this new queue is RT and the current one is BE
*/
cfq_preempt_queue(cfqd, cfqq);
cfq_mark_cfqq_must_dispatch(cfqq);

26
fs/bio-integrity.c
View file

@ -140,7 +140,6 @@ int bio_integrity_add_page(struct bio *bio, struct page *page,
iv = bip_vec_idx(bip, bip->bip_vcnt);
BUG_ON(iv == NULL);
BUG_ON(iv->bv_page != NULL);
iv->bv_page = page;
iv->bv_len = len;
@ -465,7 +464,7 @@ static int bio_integrity_verify(struct bio *bio)
if (ret) {
kunmap_atomic(kaddr, KM_USER0);
break;
return ret;
}
sectors = bv->bv_len / bi->sector_size;
@ -493,18 +492,13 @@ static void bio_integrity_verify_fn(struct work_struct *work)
struct bio_integrity_payload *bip =
container_of(work, struct bio_integrity_payload, bip_work);
struct bio *bio = bip->bip_bio;
int error = bip->bip_error;
int error;
if (bio_integrity_verify(bio)) {
clear_bit(BIO_UPTODATE, &bio->bi_flags);
error = -EIO;
}
error = bio_integrity_verify(bio);
/* Restore original bio completion handler */
bio->bi_end_io = bip->bip_end_io;
if (bio->bi_end_io)
bio->bi_end_io(bio, error);
bio_endio(bio, error);
}
/**
@ -525,7 +519,17 @@ void bio_integrity_endio(struct bio *bio, int error)
BUG_ON(bip->bip_bio != bio);
bip->bip_error = error;
/* In case of an I/O error there is no point in verifying the
* integrity metadata. Restore original bio end_io handler
* and run it.
*/
if (error) {
bio->bi_end_io = bip->bip_end_io;
bio_endio(bio, error);
return;
}
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
queue_work(kintegrityd_wq, &bip->bip_work);
}

1
include/linux/Kbuild
View file

@ -41,6 +41,7 @@ header-y += baycom.h
header-y += bfs_fs.h
header-y += blkpg.h
header-y += bpqether.h
header-y += bsg.h
header-y += can.h
header-y += cdk.h
header-y += chio.h

45
include/linux/bio.h
View file

@ -144,7 +144,7 @@ struct bio {
* bit 1 -- rw-ahead when set
* bit 2 -- barrier
* Insert a serialization point in the IO queue, forcing previously
* submitted IO to be completed before this oen is issued.
* submitted IO to be completed before this one is issued.
* bit 3 -- synchronous I/O hint: the block layer will unplug immediately
* Note that this does NOT indicate that the IO itself is sync, just
* that the block layer will not postpone issue of this IO by plugging.
@ -163,12 +163,33 @@ struct bio {
#define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */
#define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */
#define BIO_RW_BARRIER 2
#define BIO_RW_SYNC 3
#define BIO_RW_META 4
#define BIO_RW_DISCARD 5
#define BIO_RW_FAILFAST_DEV 6
#define BIO_RW_FAILFAST_TRANSPORT 7
#define BIO_RW_FAILFAST_DRIVER 8
#define BIO_RW_SYNCIO 3
#define BIO_RW_UNPLUG 4
#define BIO_RW_META 5
#define BIO_RW_DISCARD 6
#define BIO_RW_FAILFAST_DEV 7
#define BIO_RW_FAILFAST_TRANSPORT 8
#define BIO_RW_FAILFAST_DRIVER 9
#define BIO_RW_SYNC (BIO_RW_SYNCIO | BIO_RW_UNPLUG)
#define bio_rw_flagged(bio, flag) ((bio)->bi_rw & (1 << (flag)))
/*
* Old defines, these should eventually be replaced by direct usage of
* bio_rw_flagged()
*/
#define bio_barrier(bio) bio_rw_flagged(bio, BIO_RW_BARRIER)
#define bio_sync(bio) bio_rw_flagged(bio, BIO_RW_SYNCIO)
#define bio_unplug(bio) bio_rw_flagged(bio, BIO_RW_UNPLUG)
#define bio_failfast_dev(bio) bio_rw_flagged(bio, BIO_RW_FAILFAST_DEV)
#define bio_failfast_transport(bio) \
bio_rw_flagged(bio, BIO_RW_FAILFAST_TRANSPORT)
#define bio_failfast_driver(bio) \
bio_rw_flagged(bio, BIO_RW_FAILFAST_DRIVER)
#define bio_rw_ahead(bio) bio_rw_flagged(bio, BIO_RW_AHEAD)
#define bio_rw_meta(bio) bio_rw_flagged(bio, BIO_RW_META)
#define bio_discard(bio) bio_rw_flagged(bio, BIO_RW_DISCARD)
/*
* upper 16 bits of bi_rw define the io priority of this bio
@ -193,15 +214,6 @@ struct bio {
#define bio_offset(bio) bio_iovec((bio))->bv_offset
#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
#define bio_sectors(bio) ((bio)->bi_size >> 9)
#define bio_barrier(bio) ((bio)->bi_rw & (1 << BIO_RW_BARRIER))
#define bio_sync(bio) ((bio)->bi_rw & (1 << BIO_RW_SYNC))
#define bio_failfast_dev(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_DEV))
#define bio_failfast_transport(bio) \
((bio)->bi_rw & (1 << BIO_RW_FAILFAST_TRANSPORT))
#define bio_failfast_driver(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_DRIVER))
#define bio_rw_ahead(bio) ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
#define bio_rw_meta(bio) ((bio)->bi_rw & (1 << BIO_RW_META))
#define bio_discard(bio) ((bio)->bi_rw & (1 << BIO_RW_DISCARD))
#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
static inline unsigned int bio_cur_sectors(struct bio *bio)
@ -312,7 +324,6 @@ struct bio_integrity_payload {
void *bip_buf; /* generated integrity data */
bio_end_io_t *bip_end_io; /* saved I/O completion fn */
int bip_error; /* saved I/O error */
unsigned int bip_size;
unsigned short bip_pool; /* pool the ivec came from */

8
include/linux/blkdev.h
View file

@ -108,6 +108,7 @@ enum rq_flag_bits {
__REQ_RW_META, /* metadata io request */
__REQ_COPY_USER, /* contains copies of user pages */
__REQ_INTEGRITY, /* integrity metadata has been remapped */
__REQ_UNPLUG, /* unplug queue on submission */
__REQ_NR_BITS, /* stops here */
};
@ -134,6 +135,7 @@ enum rq_flag_bits {
#define REQ_RW_META (1 << __REQ_RW_META)
#define REQ_COPY_USER (1 << __REQ_COPY_USER)
#define REQ_INTEGRITY (1 << __REQ_INTEGRITY)
#define REQ_UNPLUG (1 << __REQ_UNPLUG)
#define BLK_MAX_CDB 16
@ -449,6 +451,11 @@ struct request_queue
#define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */
#define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */
#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
#define QUEUE_FLAG_IO_STAT 15 /* do IO stats */
#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
(1 << QUEUE_FLAG_CLUSTER) | \
1 << QUEUE_FLAG_STACKABLE)
static inline int queue_is_locked(struct request_queue *q)
{
@ -565,6 +572,7 @@ enum {
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_flushing(q) ((q)->ordseq)
#define blk_queue_stackable(q) \
test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)