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Merge branch 'for-4.2/core' of git://git.kernel.dk/linux-block

Browse Source 
Pull core block IO update from Jens Axboe:
 "Nothing really major in here, mostly a collection of smaller
  optimizations and cleanups, mixed with various fixes.  In more detail,
  this contains:

   - Addition of policy specific data to blkcg for block cgroups.  From
     Arianna Avanzini.

   - Various cleanups around command types from Christoph.

   - Cleanup of the suspend block I/O path from Christoph.

   - Plugging updates from Shaohua and Jeff Moyer, for blk-mq.

   - Eliminating atomic inc/dec of both remaining IO count and reference
     count in a bio.  From me.

   - Fixes for SG gap and chunk size support for data-less (discards)
     IO, so we can merge these better.  From me.

   - Small restructuring of blk-mq shared tag support, freeing drivers
     from iterating hardware queues.  From Keith Busch.

   - A few cfq-iosched tweaks, from Tahsin Erdogan and me.  Makes the
     IOPS mode the default for non-rotational storage"

* 'for-4.2/core' of git://git.kernel.dk/linux-block: (35 commits)
  cfq-iosched: fix other locations where blkcg_to_cfqgd() can return NULL
  cfq-iosched: fix sysfs oops when attempting to read unconfigured weights
  cfq-iosched: move group scheduling functions under ifdef
  cfq-iosched: fix the setting of IOPS mode on SSDs
  blktrace: Add blktrace.c to BLOCK LAYER in MAINTAINERS file
  block, cgroup: implement policy-specific per-blkcg data
  block: Make CFQ default to IOPS mode on SSDs
  block: add blk_set_queue_dying() to blkdev.h
  blk-mq: Shared tag enhancements
  block: don't honor chunk sizes for data-less IO
  block: only honor SG gap prevention for merges that contain data
  block: fix returnvar.cocci warnings
  block, dm: don't copy bios for request clones
  block: remove management of bi_remaining when restoring original bi_end_io
  block: replace trylock with mutex_lock in blkdev_reread_part()
  block: export blkdev_reread_part() and __blkdev_reread_part()
  suspend: simplify block I/O handling
  block: collapse bio bit space
  block: remove unused BIO_RW_BLOCK and BIO_EOF flags
  block: remove BIO_EOPNOTSUPP
  ...
This commit is contained in:
Linus Torvalds 2015-06-25 14:29:53 -07:00
commit bfffa1cc9d
64 changed files with 852 additions and 753 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
View File

@ -2075,6 +2075,7 @@ M: Jens Axboe <axboe@kernel.dk>
T: git git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
S: Maintained
F: block/
F: kernel/trace/blktrace.c
BLOCK2MTD DRIVER
M: Joern Engel <joern@lazybastard.org>

4
block/bio-integrity.c
View File

@ -361,7 +361,7 @@ static void bio_integrity_verify_fn(struct work_struct *work)
/* Restore original bio completion handler */
bio->bi_end_io = bip->bip_end_io;
bio_endio_nodec(bio, error);
bio_endio(bio, error);
}
/**
@ -388,7 +388,7 @@ void bio_integrity_endio(struct bio *bio, int error)
*/
if (error) {
bio->bi_end_io = bip->bip_end_io;
bio_endio_nodec(bio, error);
bio_endio(bio, error);
return;
}

69
block/bio.c
View File

@ -270,8 +270,8 @@ void bio_init(struct bio *bio)
{
memset(bio, 0, sizeof(*bio));
bio->bi_flags = 1 << BIO_UPTODATE;
atomic_set(&bio->bi_remaining, 1);
atomic_set(&bio->bi_cnt, 1);
atomic_set(&bio->__bi_remaining, 1);
atomic_set(&bio->__bi_cnt, 1);
}
EXPORT_SYMBOL(bio_init);
@ -292,8 +292,8 @@ void bio_reset(struct bio *bio)
__bio_free(bio);
memset(bio, 0, BIO_RESET_BYTES);
bio->bi_flags = flags|(1 << BIO_UPTODATE);
atomic_set(&bio->bi_remaining, 1);
bio->bi_flags = flags | (1 << BIO_UPTODATE);
atomic_set(&bio->__bi_remaining, 1);
}
EXPORT_SYMBOL(bio_reset);
@ -303,6 +303,17 @@ static void bio_chain_endio(struct bio *bio, int error)
bio_put(bio);
}
/*
* Increment chain count for the bio. Make sure the CHAIN flag update
* is visible before the raised count.
*/
static inline void bio_inc_remaining(struct bio *bio)
{
bio->bi_flags |= (1 << BIO_CHAIN);
smp_mb__before_atomic();
atomic_inc(&bio->__bi_remaining);
}
/**
* bio_chain - chain bio completions
* @bio: the target bio
@ -320,7 +331,7 @@ void bio_chain(struct bio *bio, struct bio *parent)
bio->bi_private = parent;
bio->bi_end_io = bio_chain_endio;
atomic_inc(&parent->bi_remaining);
bio_inc_remaining(parent);
}
EXPORT_SYMBOL(bio_chain);
@ -524,13 +535,17 @@ EXPORT_SYMBOL(zero_fill_bio);
**/
void bio_put(struct bio *bio)
{
BIO_BUG_ON(!atomic_read(&bio->bi_cnt));
if (!bio_flagged(bio, BIO_REFFED))
bio_free(bio);
else {
BIO_BUG_ON(!atomic_read(&bio->__bi_cnt));
/*
* last put frees it
*/
if (atomic_dec_and_test(&bio->bi_cnt))
if (atomic_dec_and_test(&bio->__bi_cnt))
bio_free(bio);
}
}
EXPORT_SYMBOL(bio_put);
@ -1741,6 +1756,25 @@ void bio_flush_dcache_pages(struct bio *bi)
EXPORT_SYMBOL(bio_flush_dcache_pages);
#endif
static inline bool bio_remaining_done(struct bio *bio)
{
/*
* If we're not chaining, then ->__bi_remaining is always 1 and
* we always end io on the first invocation.
*/
if (!bio_flagged(bio, BIO_CHAIN))
return true;
BUG_ON(atomic_read(&bio->__bi_remaining) <= 0);
if (atomic_dec_and_test(&bio->__bi_remaining)) {
clear_bit(BIO_CHAIN, &bio->bi_flags);
return true;
}
return false;
}
/**
* bio_endio - end I/O on a bio
* @bio: bio
@ -1758,15 +1792,13 @@ EXPORT_SYMBOL(bio_flush_dcache_pages);
void bio_endio(struct bio *bio, int error)
{
while (bio) {
BUG_ON(atomic_read(&bio->bi_remaining) <= 0);
if (error)
clear_bit(BIO_UPTODATE, &bio->bi_flags);
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
error = -EIO;
if (!atomic_dec_and_test(&bio->bi_remaining))
return;
if (unlikely(!bio_remaining_done(bio)))
break;
/*
* Need to have a real endio function for chained bios,
@ -1789,21 +1821,6 @@ void bio_endio(struct bio *bio, int error)
}
EXPORT_SYMBOL(bio_endio);
/**
* bio_endio_nodec - end I/O on a bio, without decrementing bi_remaining
* @bio: bio
* @error: error, if any
*
* For code that has saved and restored bi_end_io; thing hard before using this
* function, probably you should've cloned the entire bio.
**/
void bio_endio_nodec(struct bio *bio, int error)
{
atomic_inc(&bio->bi_remaining);
bio_endio(bio, error);
}
EXPORT_SYMBOL(bio_endio_nodec);
/**
* bio_split - split a bio
* @bio: bio to split

92
block/blk-cgroup.c
View File

@ -9,6 +9,10 @@
*
* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
* Nauman Rafique <nauman@google.com>
*
* For policy-specific per-blkcg data:
* Copyright (C) 2015 Paolo Valente <paolo.valente@unimore.it>
* Arianna Avanzini <avanzini.arianna@gmail.com>
*/
#include <linux/ioprio.h>
#include <linux/kdev_t.h>
@ -26,8 +30,7 @@
static DEFINE_MUTEX(blkcg_pol_mutex);
struct blkcg blkcg_root = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT,
.cfq_leaf_weight = 2 * CFQ_WEIGHT_DEFAULT, };
struct blkcg blkcg_root;
EXPORT_SYMBOL_GPL(blkcg_root);
static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];
@ -823,6 +826,8 @@ static struct cgroup_subsys_state *
blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
{
struct blkcg *blkcg;
struct cgroup_subsys_state *ret;
int i;
if (!parent_css) {
blkcg = &blkcg_root;
@ -830,17 +835,49 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
}
blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL);
if (!blkcg)
return ERR_PTR(-ENOMEM);
if (!blkcg) {
ret = ERR_PTR(-ENOMEM);
goto free_blkcg;
}
for (i = 0; i < BLKCG_MAX_POLS ; i++) {
struct blkcg_policy *pol = blkcg_policy[i];
struct blkcg_policy_data *cpd;
/*
* If the policy hasn't been attached yet, wait for it
* to be attached before doing anything else. Otherwise,
* check if the policy requires any specific per-cgroup
* data: if it does, allocate and initialize it.
*/
if (!pol || !pol->cpd_size)
continue;
BUG_ON(blkcg->pd[i]);
cpd = kzalloc(pol->cpd_size, GFP_KERNEL);
if (!cpd) {
ret = ERR_PTR(-ENOMEM);
goto free_pd_blkcg;
}
blkcg->pd[i] = cpd;
cpd->plid = i;
pol->cpd_init_fn(blkcg);
}
blkcg->cfq_weight = CFQ_WEIGHT_DEFAULT;
blkcg->cfq_leaf_weight = CFQ_WEIGHT_DEFAULT;
done:
spin_lock_init(&blkcg->lock);
INIT_RADIX_TREE(&blkcg->blkg_tree, GFP_ATOMIC);
INIT_HLIST_HEAD(&blkcg->blkg_list);
return &blkcg->css;
free_pd_blkcg:
for (i--; i >= 0; i--)
kfree(blkcg->pd[i]);
free_blkcg:
kfree(blkcg);
return ret;
}
/**
@ -958,8 +995,10 @@ int blkcg_activate_policy(struct request_queue *q,
const struct blkcg_policy *pol)
{
LIST_HEAD(pds);
LIST_HEAD(cpds);
struct blkcg_gq *blkg, *new_blkg;
struct blkg_policy_data *pd, *n;
struct blkg_policy_data *pd, *nd;
struct blkcg_policy_data *cpd, *cnd;
int cnt = 0, ret;
bool preloaded;
@ -1003,7 +1042,10 @@ int blkcg_activate_policy(struct request_queue *q,
spin_unlock_irq(q->queue_lock);
/* allocate policy_data for all existing blkgs */
/*
* Allocate per-blkg and per-blkcg policy data
* for all existing blkgs.
*/
while (cnt--) {
pd = kzalloc_node(pol->pd_size, GFP_KERNEL, q->node);
if (!pd) {
@ -1011,26 +1053,50 @@ int blkcg_activate_policy(struct request_queue *q,
goto out_free;
}
list_add_tail(&pd->alloc_node, &pds);
if (!pol->cpd_size)
continue;
cpd = kzalloc_node(pol->cpd_size, GFP_KERNEL, q->node);
if (!cpd) {
ret = -ENOMEM;
goto out_free;
}
list_add_tail(&cpd->alloc_node, &cpds);
}
/*
* Install the allocated pds. With @q bypassing, no new blkg
* Install the allocated pds and cpds. With @q bypassing, no new blkg
* should have been created while the queue lock was dropped.
*/
spin_lock_irq(q->queue_lock);
list_for_each_entry(blkg, &q->blkg_list, q_node) {
if (WARN_ON(list_empty(&pds))) {
if (WARN_ON(list_empty(&pds)) ||
WARN_ON(pol->cpd_size && list_empty(&cpds))) {
/* umm... this shouldn't happen, just abort */
ret = -ENOMEM;
goto out_unlock;
}
cpd = list_first_entry(&cpds, struct blkcg_policy_data,
alloc_node);
list_del_init(&cpd->alloc_node);
pd = list_first_entry(&pds, struct blkg_policy_data, alloc_node);
list_del_init(&pd->alloc_node);
/* grab blkcg lock too while installing @pd on @blkg */
spin_lock(&blkg->blkcg->lock);
if (!pol->cpd_size)
goto no_cpd;
if (!blkg->blkcg->pd[pol->plid]) {
/* Per-policy per-blkcg data */
blkg->blkcg->pd[pol->plid] = cpd;
cpd->plid = pol->plid;
pol->cpd_init_fn(blkg->blkcg);
} else { /* must free it as it has already been extracted */
kfree(cpd);
}
no_cpd:
blkg->pd[pol->plid] = pd;
pd->blkg = blkg;
pd->plid = pol->plid;
@ -1045,8 +1111,10 @@ out_unlock:
spin_unlock_irq(q->queue_lock);
out_free:
blk_queue_bypass_end(q);
list_for_each_entry_safe(pd, n, &pds, alloc_node)
list_for_each_entry_safe(pd, nd, &pds, alloc_node)
kfree(pd);
list_for_each_entry_safe(cpd, cnd, &cpds, alloc_node)
kfree(cpd);
return ret;
}
EXPORT_SYMBOL_GPL(blkcg_activate_policy);
@ -1087,6 +1155,8 @@ void blkcg_deactivate_policy(struct request_queue *q,
kfree(blkg->pd[pol->plid]);
blkg->pd[pol->plid] = NULL;
kfree(blkg->blkcg->pd[pol->plid]);
blkg->blkcg->pd[pol->plid] = NULL;
spin_unlock(&blkg->blkcg->lock);
}

40
block/blk-cgroup.h
View File

@ -23,11 +23,6 @@
/* Max limits for throttle policy */
#define THROTL_IOPS_MAX UINT_MAX
/* CFQ specific, out here for blkcg->cfq_weight */
#define CFQ_WEIGHT_MIN 10
#define CFQ_WEIGHT_MAX 1000
#define CFQ_WEIGHT_DEFAULT 500
#ifdef CONFIG_BLK_CGROUP
enum blkg_rwstat_type {
@ -50,9 +45,7 @@ struct blkcg {
struct blkcg_gq *blkg_hint;
struct hlist_head blkg_list;
/* TODO: per-policy storage in blkcg */
unsigned int cfq_weight; /* belongs to cfq */
unsigned int cfq_leaf_weight;
struct blkcg_policy_data *pd[BLKCG_MAX_POLS];
};
struct blkg_stat {
@ -87,6 +80,24 @@ struct blkg_policy_data {
struct list_head alloc_node;
};
/*
* Policies that need to keep per-blkcg data which is independent
* from any request_queue associated to it must specify its size
* with the cpd_size field of the blkcg_policy structure and
* embed a blkcg_policy_data in it. blkcg core allocates
* policy-specific per-blkcg structures lazily the first time
* they are actually needed, so it handles them together with
* blkgs. cpd_init() is invoked to let each policy handle
* per-blkcg data.
*/
struct blkcg_policy_data {
/* the policy id this per-policy data belongs to */
int plid;
/* used during policy activation */
struct list_head alloc_node;
};
/* association between a blk cgroup and a request queue */
struct blkcg_gq {
/* Pointer to the associated request_queue */
@ -112,6 +123,7 @@ struct blkcg_gq {
struct rcu_head rcu_head;
};
typedef void (blkcg_pol_init_cpd_fn)(const struct blkcg *blkcg);
typedef void (blkcg_pol_init_pd_fn)(struct blkcg_gq *blkg);
typedef void (blkcg_pol_online_pd_fn)(struct blkcg_gq *blkg);
typedef void (blkcg_pol_offline_pd_fn)(struct blkcg_gq *blkg);
@ -122,10 +134,13 @@ struct blkcg_policy {
int plid;
/* policy specific private data size */
size_t pd_size;
/* policy specific per-blkcg data size */
size_t cpd_size;
/* cgroup files for the policy */
struct cftype *cftypes;
/* operations */
blkcg_pol_init_cpd_fn *cpd_init_fn;
blkcg_pol_init_pd_fn *pd_init_fn;
blkcg_pol_online_pd_fn *pd_online_fn;
blkcg_pol_offline_pd_fn *pd_offline_fn;
@ -218,6 +233,12 @@ static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg,
return blkg ? blkg->pd[pol->plid] : NULL;
}
static inline struct blkcg_policy_data *blkcg_to_cpd(struct blkcg *blkcg,
struct blkcg_policy *pol)
{
return blkcg ? blkcg->pd[pol->plid] : NULL;
}
/**
* pdata_to_blkg - get blkg associated with policy private data
* @pd: policy private data of interest
@ -564,6 +585,9 @@ struct blkcg;
struct blkg_policy_data {
};
struct blkcg_policy_data {
};
struct blkcg_gq {
};

128
block/blk-core.c
View File

@ -117,7 +117,7 @@ EXPORT_SYMBOL(blk_rq_init);
static void req_bio_endio(struct request *rq, struct bio *bio,
unsigned int nbytes, int error)
{
if (error)
if (error && !(rq->cmd_flags & REQ_CLONE))
clear_bit(BIO_UPTODATE, &bio->bi_flags);
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
error = -EIO;
@ -128,7 +128,8 @@ static void req_bio_endio(struct request *rq, struct bio *bio,
bio_advance(bio, nbytes);
/* don't actually finish bio if it's part of flush sequence */
if (bio->bi_iter.bi_size == 0 && !(rq->cmd_flags & REQ_FLUSH_SEQ))
if (bio->bi_iter.bi_size == 0 &&
!(rq->cmd_flags & (REQ_FLUSH_SEQ|REQ_CLONE)))
bio_endio(bio, error);
}
@ -285,6 +286,7 @@ inline void __blk_run_queue_uncond(struct request_queue *q)
q->request_fn(q);
q->request_fn_active--;
}
EXPORT_SYMBOL_GPL(__blk_run_queue_uncond);
/**
* __blk_run_queue - run a single device queue
@ -1525,7 +1527,8 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
* Caller must ensure !blk_queue_nomerges(q) beforehand.
*/
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int *request_count)
unsigned int *request_count,
struct request **same_queue_rq)
{
struct blk_plug *plug;
struct request *rq;
@ -1545,8 +1548,16 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
list_for_each_entry_reverse(rq, plug_list, queuelist) {
int el_ret;
if (rq->q == q)
if (rq->q == q) {
(*request_count)++;
/*
* Only blk-mq multiple hardware queues case checks the
* rq in the same queue, there should be only one such
* rq in a queue
**/
if (same_queue_rq)
*same_queue_rq = rq;
}
if (rq->q != q || !blk_rq_merge_ok(rq, bio))
continue;
@ -1611,7 +1622,7 @@ static void blk_queue_bio(struct request_queue *q, struct bio *bio)
* any locks.
*/
if (!blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count))
blk_attempt_plug_merge(q, bio, &request_count, NULL))
return;
spin_lock_irq(q->queue_lock);
@ -1718,8 +1729,6 @@ static void handle_bad_sector(struct bio *bio)
bio->bi_rw,
(unsigned long long)bio_end_sector(bio),
(long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));
set_bit(BIO_EOF, &bio->bi_flags);
}
#ifdef CONFIG_FAIL_MAKE_REQUEST
@ -2904,95 +2913,22 @@ int blk_lld_busy(struct request_queue *q)
}
EXPORT_SYMBOL_GPL(blk_lld_busy);
/**
* blk_rq_unprep_clone - Helper function to free all bios in a cloned request
* @rq: the clone request to be cleaned up
*
* Description:
* Free all bios in @rq for a cloned request.
*/
void blk_rq_unprep_clone(struct request *rq)
{
struct bio *bio;
while ((bio = rq->bio) != NULL) {
rq->bio = bio->bi_next;
bio_put(bio);
}
}
EXPORT_SYMBOL_GPL(blk_rq_unprep_clone);
/*
* Copy attributes of the original request to the clone request.
* The actual data parts (e.g. ->cmd, ->sense) are not copied.
*/
static void __blk_rq_prep_clone(struct request *dst, struct request *src)
void blk_rq_prep_clone(struct request *dst, struct request *src)
{
dst->cpu = src->cpu;
dst->cmd_flags |= (src->cmd_flags & REQ_CLONE_MASK) | REQ_NOMERGE;
dst->cmd_flags |= (src->cmd_flags & REQ_CLONE_MASK);
dst->cmd_flags |= REQ_NOMERGE | REQ_CLONE;
dst->cmd_type = src->cmd_type;
dst->__sector = blk_rq_pos(src);
dst->__data_len = blk_rq_bytes(src);
dst->nr_phys_segments = src->nr_phys_segments;
dst->ioprio = src->ioprio;
dst->extra_len = src->extra_len;
}
/**
* blk_rq_prep_clone - Helper function to setup clone request
* @rq: the request to be setup
* @rq_src: original request to be cloned
* @bs: bio_set that bios for clone are allocated from
* @gfp_mask: memory allocation mask for bio
* @bio_ctr: setup function to be called for each clone bio.
* Returns %0 for success, non %0 for failure.
* @data: private data to be passed to @bio_ctr
*
* Description:
* Clones bios in @rq_src to @rq, and copies attributes of @rq_src to @rq.
* The actual data parts of @rq_src (e.g. ->cmd, ->sense)
* are not copied, and copying such parts is the caller's responsibility.
* Also, pages which the original bios are pointing to are not copied
* and the cloned bios just point same pages.
* So cloned bios must be completed before original bios, which means
* the caller must complete @rq before @rq_src.
*/
int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
struct bio_set *bs, gfp_t gfp_mask,
int (*bio_ctr)(struct bio *, struct bio *, void *),
void *data)
{
struct bio *bio, *bio_src;
if (!bs)
bs = fs_bio_set;
__rq_for_each_bio(bio_src, rq_src) {
bio = bio_clone_fast(bio_src, gfp_mask, bs);
if (!bio)
goto free_and_out;
if (bio_ctr && bio_ctr(bio, bio_src, data))
goto free_and_out;
if (rq->bio) {
rq->biotail->bi_next = bio;
rq->biotail = bio;
} else
rq->bio = rq->biotail = bio;
}
__blk_rq_prep_clone(rq, rq_src);
return 0;
free_and_out:
if (bio)
bio_put(bio);
blk_rq_unprep_clone(rq);
return -ENOMEM;
dst->bio = src->bio;
dst->biotail = src->biotail;
dst->cmd = src->cmd;
dst->cmd_len = src->cmd_len;
dst->sense = src->sense;
}
EXPORT_SYMBOL_GPL(blk_rq_prep_clone);
@ -3034,21 +2970,20 @@ void blk_start_plug(struct blk_plug *plug)
{
struct task_struct *tsk = current;
/*
* If this is a nested plug, don't actually assign it.
*/
if (tsk->plug)
return;
INIT_LIST_HEAD(&plug->list);
INIT_LIST_HEAD(&plug->mq_list);
INIT_LIST_HEAD(&plug->cb_list);
/*
* If this is a nested plug, don't actually assign it. It will be
* flushed on its own.
*/
if (!tsk->plug) {
/*
* Store ordering should not be needed here, since a potential
* preempt will imply a full memory barrier
*/
tsk->plug = plug;
}
}
EXPORT_SYMBOL(blk_start_plug);
@ -3195,9 +3130,10 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
void blk_finish_plug(struct blk_plug *plug)
{
if (plug != current->plug)
return;
blk_flush_plug_list(plug, false);
if (plug == current->plug)
current->plug = NULL;
}
EXPORT_SYMBOL(blk_finish_plug);

10
block/blk-exec.c
View File

@ -53,7 +53,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
rq_end_io_fn *done)
{
int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
bool is_pm_resume;
WARN_ON(irqs_disabled());
WARN_ON(rq->cmd_type == REQ_TYPE_FS);
@ -70,12 +69,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
return;
}
/*
* need to check this before __blk_run_queue(), because rq can
* be freed before that returns.
*/
is_pm_resume = rq->cmd_type == REQ_TYPE_PM_RESUME;
spin_lock_irq(q->queue_lock);
if (unlikely(blk_queue_dying(q))) {
@ -88,9 +81,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
__elv_add_request(q, rq, where);
__blk_run_queue(q);
/* the queue is stopped so it won't be run */
if (is_pm_resume)
__blk_run_queue_uncond(q);
spin_unlock_irq(q->queue_lock);
}
EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);

3
block/blk-merge.c
View File

@ -589,7 +589,8 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
!blk_write_same_mergeable(rq->bio, bio))
return false;
if (q->queue_flags & (1 << QUEUE_FLAG_SG_GAPS)) {
/* Only check gaps if the bio carries data */
if (q->queue_flags & (1 << QUEUE_FLAG_SG_GAPS) && bio_has_data(bio)) {
struct bio_vec *bprev;
bprev = &rq->biotail->bi_io_vec[rq->biotail->bi_vcnt - 1];

38
block/blk-mq-tag.c
View File

@ -438,6 +438,39 @@ static void bt_for_each(struct blk_mq_hw_ctx *hctx,
}
}
static void bt_tags_for_each(struct blk_mq_tags *tags,
struct blk_mq_bitmap_tags *bt, unsigned int off,
busy_tag_iter_fn *fn, void *data, bool reserved)
{
struct request *rq;
int bit, i;
if (!tags->rqs)
return;
for (i = 0; i < bt->map_nr; i++) {
struct blk_align_bitmap *bm = &bt->map[i];
for (bit = find_first_bit(&bm->word, bm->depth);
bit < bm->depth;
bit = find_next_bit(&bm->word, bm->depth, bit + 1)) {
rq = blk_mq_tag_to_rq(tags, off + bit);
fn(rq, data, reserved);
}
off += (1 << bt->bits_per_word);
}
}
void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
void *priv)
{
if (tags->nr_reserved_tags)
bt_tags_for_each(tags, &tags->breserved_tags, 0, fn, priv, true);
bt_tags_for_each(tags, &tags->bitmap_tags, tags->nr_reserved_tags, fn, priv,
false);
}
EXPORT_SYMBOL(blk_mq_all_tag_busy_iter);
void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,
void *priv)
{
@ -580,6 +613,11 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int total_tags,
if (!tags)
return NULL;
if (!zalloc_cpumask_var(&tags->cpumask, GFP_KERNEL)) {
kfree(tags);
return NULL;
}
tags->nr_tags = total_tags;
tags->nr_reserved_tags = reserved_tags;

1
block/blk-mq-tag.h
View File

@ -44,6 +44,7 @@ struct blk_mq_tags {
struct list_head page_list;
int alloc_policy;
cpumask_var_t cpumask;
};

140
block/blk-mq.c
View File

@ -89,7 +89,8 @@ static int blk_mq_queue_enter(struct request_queue *q, gfp_t gfp)
return -EBUSY;
ret = wait_event_interruptible(q->mq_freeze_wq,
!q->mq_freeze_depth || blk_queue_dying(q));
!atomic_read(&q->mq_freeze_depth) ||
blk_queue_dying(q));
if (blk_queue_dying(q))
return -ENODEV;
if (ret)
@ -112,13 +113,10 @@ static void blk_mq_usage_counter_release(struct percpu_ref *ref)
void blk_mq_freeze_queue_start(struct request_queue *q)
{
bool freeze;
int freeze_depth;
spin_lock_irq(q->queue_lock);
freeze = !q->mq_freeze_depth++;
spin_unlock_irq(q->queue_lock);
if (freeze) {
freeze_depth = atomic_inc_return(&q->mq_freeze_depth);
if (freeze_depth == 1) {
percpu_ref_kill(&q->mq_usage_counter);
blk_mq_run_hw_queues(q, false);
}
@ -143,13 +141,11 @@ EXPORT_SYMBOL_GPL(blk_mq_freeze_queue);
void blk_mq_unfreeze_queue(struct request_queue *q)
{
bool wake;
int freeze_depth;
spin_lock_irq(q->queue_lock);
wake = !--q->mq_freeze_depth;
WARN_ON_ONCE(q->mq_freeze_depth < 0);
spin_unlock_irq(q->queue_lock);
if (wake) {
freeze_depth = atomic_dec_return(&q->mq_freeze_depth);
WARN_ON_ONCE(freeze_depth < 0);
if (!freeze_depth) {
percpu_ref_reinit(&q->mq_usage_counter);
wake_up_all(&q->mq_freeze_wq);
}
@ -1237,6 +1233,38 @@ static struct request *blk_mq_map_request(struct request_queue *q,
return rq;
}
static int blk_mq_direct_issue_request(struct request *rq)
{
int ret;
struct request_queue *q = rq->q;
struct blk_mq_hw_ctx *hctx = q->mq_ops->map_queue(q,
rq->mq_ctx->cpu);
struct blk_mq_queue_data bd = {
.rq = rq,
.list = NULL,
.last = 1
};
/*
* For OK queue, we are done. For error, kill it. Any other
* error (busy), just add it to our list as we previously
* would have done
*/
ret = q->mq_ops->queue_rq(hctx, &bd);
if (ret == BLK_MQ_RQ_QUEUE_OK)
return 0;
else {
__blk_mq_requeue_request(rq);
if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
rq->errors = -EIO;
blk_mq_end_request(rq, rq->errors);
return 0;
}
return -1;
}
}
/*
* Multiple hardware queue variant. This will not use per-process plugs,
* but will attempt to bypass the hctx queueing if we can go straight to
@ -1248,6 +1276,9 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
struct blk_map_ctx data;
struct request *rq;
unsigned int request_count = 0;
struct blk_plug *plug;
struct request *same_queue_rq = NULL;
blk_queue_bounce(q, &bio);
@ -1256,6 +1287,10 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
return;
}
if (!is_flush_fua && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq))
return;
rq = blk_mq_map_request(q, bio, &data);
if (unlikely(!rq))
return;
@ -1266,38 +1301,42 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
goto run_queue;
}
plug = current->plug;
/*
* If the driver supports defer issued based on 'last', then
* queue it up like normal since we can potentially save some
* CPU this way.
*/
if (is_sync && !(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) {
struct blk_mq_queue_data bd = {
.rq = rq,
.list = NULL,
.last = 1
};
int ret;
if (((plug && !blk_queue_nomerges(q)) || is_sync) &&
!(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) {
struct request *old_rq = NULL;
blk_mq_bio_to_request(rq, bio);
/*
* For OK queue, we are done. For error, kill it. Any other
* error (busy), just add it to our list as we previously
* would have done
* we do limited pluging. If bio can be merged, do merge.
* Otherwise the existing request in the plug list will be
* issued. So the plug list will have one request at most
*/
ret = q->mq_ops->queue_rq(data.hctx, &bd);
if (ret == BLK_MQ_RQ_QUEUE_OK)
goto done;
else {
__blk_mq_requeue_request(rq);
if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
rq->errors = -EIO;
blk_mq_end_request(rq, rq->errors);
goto done;
}
if (plug) {
/*
* The plug list might get flushed before this. If that
* happens, same_queue_rq is invalid and plug list is empty
**/
if (same_queue_rq && !list_empty(&plug->mq_list)) {
old_rq = same_queue_rq;
list_del_init(&old_rq->queuelist);
}
list_add_tail(&rq->queuelist, &plug->mq_list);
} else /* is_sync */
old_rq = rq;
blk_mq_put_ctx(data.ctx);
if (!old_rq)
return;
if (!blk_mq_direct_issue_request(old_rq))
return;
blk_mq_insert_request(old_rq, false, true, true);
return;
}
if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) {
@ -1310,7 +1349,6 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
run_queue:
blk_mq_run_hw_queue(data.hctx, !is_sync || is_flush_fua);
}
done:
blk_mq_put_ctx(data.ctx);
}
@ -1322,16 +1360,11 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
{
const int is_sync = rw_is_sync(bio->bi_rw);
const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
unsigned int use_plug, request_count = 0;
struct blk_plug *plug;
unsigned int request_count = 0;
struct blk_map_ctx data;
struct request *rq;
/*
* If we have multiple hardware queues, just go directly to
* one of those for sync IO.
*/
use_plug = !is_flush_fua && !is_sync;
blk_queue_bounce(q, &bio);
if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
@ -1339,8 +1372,8 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
return;
}
if (use_plug && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count))
if (!is_flush_fua && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count, NULL))
return;
rq = blk_mq_map_request(q, bio, &data);
@ -1358,9 +1391,7 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
* utilize that to temporarily store requests until the task is
* either done or scheduled away.
*/
if (use_plug) {
struct blk_plug *plug = current->plug;
plug = current->plug;
if (plug) {
blk_mq_bio_to_request(rq, bio);
if (list_empty(&plug->mq_list))
@ -1373,7 +1404,6 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
blk_mq_put_ctx(data.ctx);
return;
}
}
if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) {
/*
@ -1508,7 +1538,6 @@ static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
i++;
}
}
return tags;
fail:
@ -1792,6 +1821,7 @@ static void blk_mq_map_swqueue(struct request_queue *q)
hctx = q->mq_ops->map_queue(q, i);
cpumask_set_cpu(i, hctx->cpumask);
cpumask_set_cpu(i, hctx->tags->cpumask);
ctx->index_hw = hctx->nr_ctx;
hctx->ctxs[hctx->nr_ctx++] = ctx;
}
@ -2056,7 +2086,7 @@ void blk_mq_free_queue(struct request_queue *q)
/* Basically redo blk_mq_init_queue with queue frozen */
static void blk_mq_queue_reinit(struct request_queue *q)
{
WARN_ON_ONCE(!q->mq_freeze_depth);
WARN_ON_ONCE(!atomic_read(&q->mq_freeze_depth));
blk_mq_sysfs_unregister(q);
@ -2173,6 +2203,12 @@ static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set)
return 0;
}
struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags)
{
return tags->cpumask;
}
EXPORT_SYMBOL_GPL(blk_mq_tags_cpumask);
/*
* Alloc a tag set to be associated with one or more request queues.
* May fail with EINVAL for various error conditions. May adjust the
@ -2234,8 +2270,10 @@ void blk_mq_free_tag_set(struct blk_mq_tag_set *set)
int i;
for (i = 0; i < set->nr_hw_queues; i++) {
if (set->tags[i])
if (set->tags[i]) {
blk_mq_free_rq_map(set, set->tags[i], i);
free_cpumask_var(set->tags[i]->cpumask);
}
}
kfree(set->tags);

5
block/blk.h
View File

@ -78,7 +78,8 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
struct bio *bio);
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int *request_count);
unsigned int *request_count,
struct request **same_queue_rq);
void blk_account_io_start(struct request *req, bool new_io);
void blk_account_io_completion(struct request *req, unsigned int bytes);
@ -193,8 +194,6 @@ int blk_try_merge(struct request *rq, struct bio *bio);
void blk_queue_congestion_threshold(struct request_queue *q);
void __blk_run_queue_uncond(struct request_queue *q);
int blk_dev_init(void);

3
block/bounce.c
View File

@ -128,9 +128,6 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
struct bio_vec *bvec, *org_vec;
int i;
if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
set_bit(BIO_EOPNOTSUPP, &bio_orig->bi_flags);
/*
* free up bounce indirect pages used
*/

125
block/cfq-iosched.c
View File

@ -67,6 +67,11 @@ static struct kmem_cache *cfq_pool;
#define sample_valid(samples) ((samples) > 80)
#define rb_entry_cfqg(node) rb_entry((node), struct cfq_group, rb_node)
/* blkio-related constants */
#define CFQ_WEIGHT_MIN 10
#define CFQ_WEIGHT_MAX 1000
#define CFQ_WEIGHT_DEFAULT 500
struct cfq_ttime {
unsigned long last_end_request;
@ -212,6 +217,15 @@ struct cfqg_stats {
#endif /* CONFIG_CFQ_GROUP_IOSCHED */
};
/* Per-cgroup data */
struct cfq_group_data {
/* must be the first member */
struct blkcg_policy_data pd;
unsigned int weight;
unsigned int leaf_weight;
};
/* This is per cgroup per device grouping structure */
struct cfq_group {
/* must be the first member */
@ -446,16 +460,6 @@ CFQ_CFQQ_FNS(deep);
CFQ_CFQQ_FNS(wait_busy);
#undef CFQ_CFQQ_FNS
static inline struct cfq_group *pd_to_cfqg(struct blkg_policy_data *pd)
{
return pd ? container_of(pd, struct cfq_group, pd) : NULL;
}
static inline struct blkcg_gq *cfqg_to_blkg(struct cfq_group *cfqg)
{
return pd_to_blkg(&cfqg->pd);
}
#if defined(CONFIG_CFQ_GROUP_IOSCHED) && defined(CONFIG_DEBUG_BLK_CGROUP)
/* cfqg stats flags */
@ -600,6 +604,22 @@ static inline void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) { }
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static inline struct cfq_group *pd_to_cfqg(struct blkg_policy_data *pd)
{
return pd ? container_of(pd, struct cfq_group, pd) : NULL;
}
static struct cfq_group_data
*cpd_to_cfqgd(struct blkcg_policy_data *cpd)
{
return cpd ? container_of(cpd, struct cfq_group_data, pd) : NULL;
}
static inline struct blkcg_gq *cfqg_to_blkg(struct cfq_group *cfqg)
{
return pd_to_blkg(&cfqg->pd);
}
static struct blkcg_policy blkcg_policy_cfq;
static inline struct cfq_group *blkg_to_cfqg(struct blkcg_gq *blkg)
@ -607,6 +627,11 @@ static inline struct cfq_group *blkg_to_cfqg(struct blkcg_gq *blkg)
return pd_to_cfqg(blkg_to_pd(blkg, &blkcg_policy_cfq));
}
static struct cfq_group_data *blkcg_to_cfqgd(struct blkcg *blkcg)
{
return cpd_to_cfqgd(blkcg_to_cpd(blkcg, &blkcg_policy_cfq));
}
static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg)
{
struct blkcg_gq *pblkg = cfqg_to_blkg(cfqg)->parent;
@ -1544,13 +1569,28 @@ static void cfqg_stats_init(struct cfqg_stats *stats)
#endif
}
static void cfq_cpd_init(const struct blkcg *blkcg)
{
struct cfq_group_data *cgd =
cpd_to_cfqgd(blkcg->pd[blkcg_policy_cfq.plid]);
if (blkcg == &blkcg_root) {
cgd->weight = 2 * CFQ_WEIGHT_DEFAULT;
cgd->leaf_weight = 2 * CFQ_WEIGHT_DEFAULT;
} else {
cgd->weight = CFQ_WEIGHT_DEFAULT;
cgd->leaf_weight = CFQ_WEIGHT_DEFAULT;
}
}
static void cfq_pd_init(struct blkcg_gq *blkg)
{
struct cfq_group *cfqg = blkg_to_cfqg(blkg);
struct cfq_group_data *cgd = blkcg_to_cfqgd(blkg->blkcg);
cfq_init_cfqg_base(cfqg);
cfqg->weight = blkg->blkcg->cfq_weight;
cfqg->leaf_weight = blkg->blkcg->cfq_leaf_weight;
cfqg->weight = cgd->weight;
cfqg->leaf_weight = cgd->leaf_weight;
cfqg_stats_init(&cfqg->stats);
cfqg_stats_init(&cfqg->dead_stats);
}
@ -1673,13 +1713,27 @@ static int cfqg_print_leaf_weight_device(struct seq_file *sf, void *v)
static int cfq_print_weight(struct seq_file *sf, void *v)
{
seq_printf(sf, "%u\n", css_to_blkcg(seq_css(sf))->cfq_weight);
struct blkcg *blkcg = css_to_blkcg(seq_css(sf));
struct cfq_group_data *cgd = blkcg_to_cfqgd(blkcg);
unsigned int val = 0;
if (cgd)
val = cgd->weight;
seq_printf(sf, "%u\n", val);
return 0;
}
static int cfq_print_leaf_weight(struct seq_file *sf, void *v)
{
seq_printf(sf, "%u\n", css_to_blkcg(seq_css(sf))->cfq_leaf_weight);
struct blkcg *blkcg = css_to_blkcg(seq_css(sf));
struct cfq_group_data *cgd = blkcg_to_cfqgd(blkcg);
unsigned int val = 0;
if (cgd)
val = cgd->leaf_weight;
seq_printf(sf, "%u\n", val);
return 0;
}
@ -1690,6 +1744,7 @@ static ssize_t __cfqg_set_weight_device(struct kernfs_open_file *of,
struct blkcg *blkcg = css_to_blkcg(of_css(of));
struct blkg_conf_ctx ctx;
struct cfq_group *cfqg;
struct cfq_group_data *cfqgd;
int ret;
ret = blkg_conf_prep(blkcg, &blkcg_policy_cfq, buf, &ctx);
@ -1698,17 +1753,22 @@ static ssize_t __cfqg_set_weight_device(struct kernfs_open_file *of,
ret = -EINVAL;
cfqg = blkg_to_cfqg(ctx.blkg);
cfqgd = blkcg_to_cfqgd(blkcg);
if (!cfqg || !cfqgd)
goto err;
if (!ctx.v || (ctx.v >= CFQ_WEIGHT_MIN && ctx.v <= CFQ_WEIGHT_MAX)) {
if (!is_leaf_weight) {
cfqg->dev_weight = ctx.v;
cfqg->new_weight = ctx.v ?: blkcg->cfq_weight;
cfqg->new_weight = ctx.v ?: cfqgd->weight;
} else {
cfqg->dev_leaf_weight = ctx.v;
cfqg->new_leaf_weight = ctx.v ?: blkcg->cfq_leaf_weight;
cfqg->new_leaf_weight = ctx.v ?: cfqgd->leaf_weight;
}
ret = 0;
}
err:
blkg_conf_finish(&ctx);
return ret ?: nbytes;
}
@ -1730,16 +1790,23 @@ static int __cfq_set_weight(struct cgroup_subsys_state *css, struct cftype *cft,
{
struct blkcg *blkcg = css_to_blkcg(css);
struct blkcg_gq *blkg;
struct cfq_group_data *cfqgd;
int ret = 0;
if (val < CFQ_WEIGHT_MIN || val > CFQ_WEIGHT_MAX)
return -EINVAL;
spin_lock_irq(&blkcg->lock);
cfqgd = blkcg_to_cfqgd(blkcg);
if (!cfqgd) {
ret = -EINVAL;
goto out;
}
if (!is_leaf_weight)
blkcg->cfq_weight = val;
cfqgd->weight = val;
else
blkcg->cfq_leaf_weight = val;
cfqgd->leaf_weight = val;
hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) {
struct cfq_group *cfqg = blkg_to_cfqg(blkg);
@ -1749,15 +1816,16 @@ static int __cfq_set_weight(struct cgroup_subsys_state *css, struct cftype *cft,
if (!is_leaf_weight) {
if (!cfqg->dev_weight)
cfqg->new_weight = blkcg->cfq_weight;
cfqg->new_weight = cfqgd->weight;
} else {
if (!cfqg->dev_leaf_weight)
cfqg->new_leaf_weight = blkcg->cfq_leaf_weight;
cfqg->new_leaf_weight = cfqgd->leaf_weight;
}
}
out:
spin_unlock_irq(&blkcg->lock);
return 0;
return ret;
}
static int cfq_set_weight(struct cgroup_subsys_state *css, struct cftype *cft,
@ -4477,6 +4545,18 @@ out_free:
return ret;
}
static void cfq_registered_queue(struct request_queue *q)
{
struct elevator_queue *e = q->elevator;
struct cfq_data *cfqd = e->elevator_data;
/*
* Default to IOPS mode with no idling for SSDs
*/
if (blk_queue_nonrot(q))
cfqd->cfq_slice_idle = 0;
}
/*
* sysfs parts below -->
*/
@ -4592,6 +4672,7 @@ static struct elevator_type iosched_cfq = {
.elevator_may_queue_fn = cfq_may_queue,
.elevator_init_fn = cfq_init_queue,
.elevator_exit_fn = cfq_exit_queue,
.elevator_registered_fn = cfq_registered_queue,
},
.icq_size = sizeof(struct cfq_io_cq),
.icq_align = __alignof__(struct cfq_io_cq),
@ -4603,8 +4684,10 @@ static struct elevator_type iosched_cfq = {
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static struct blkcg_policy blkcg_policy_cfq = {
.pd_size = sizeof(struct cfq_group),
.cpd_size = sizeof(struct cfq_group_data),
.cftypes = cfq_blkcg_files,
.cpd_init_fn = cfq_cpd_init,
.pd_init_fn = cfq_pd_init,
.pd_offline_fn = cfq_pd_offline,
.pd_reset_stats_fn = cfq_pd_reset_stats,

2
block/elevator.c
View File

@ -806,6 +806,8 @@ int elv_register_queue(struct request_queue *q)
}
kobject_uevent(&e->kobj, KOBJ_ADD);
e->registered = 1;
if (e->type->ops.elevator_registered_fn)
e->type->ops.elevator_registered_fn(q);
}
return error;
}

37
block/ioctl.c
View File

@ -150,21 +150,48 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
}
}
static int blkdev_reread_part(struct block_device *bdev)
/*
* This is an exported API for the block driver, and will not
* acquire bd_mutex. This API should be used in case that
* caller has held bd_mutex already.
*/
int __blkdev_reread_part(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
int res;
if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!mutex_trylock(&bdev->bd_mutex))
return -EBUSY;
res = rescan_partitions(disk, bdev);
lockdep_assert_held(&bdev->bd_mutex);
return rescan_partitions(disk, bdev);
}
EXPORT_SYMBOL(__blkdev_reread_part);
/*
* This is an exported API for the block driver, and will
* try to acquire bd_mutex. If bd_mutex has been held already
* in current context, please call __blkdev_reread_part().
*
* Make sure the held locks in current context aren't required
* in open()/close() handler and I/O path for avoiding ABBA deadlock:
* - bd_mutex is held before calling block driver's open/close
* handler
* - reading partition table may submit I/O to the block device
*/
int blkdev_reread_part(struct block_device *bdev)
{
int res;
mutex_lock(&bdev->bd_mutex);
res = __blkdev_reread_part(bdev);
mutex_unlock(&bdev->bd_mutex);
return res;
}
EXPORT_SYMBOL(blkdev_reread_part);
static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
uint64_t len, int secure)

44
drivers/block/nbd.c
View File

@ -230,29 +230,40 @@ static int nbd_send_req(struct nbd_device *nbd, struct request *req)
int result, flags;
struct nbd_request request;
unsigned long size = blk_rq_bytes(req);
u32 type;
if (req->cmd_type == REQ_TYPE_DRV_PRIV)
type = NBD_CMD_DISC;
else if (req->cmd_flags & REQ_DISCARD)
type = NBD_CMD_TRIM;
else if (req->cmd_flags & REQ_FLUSH)
type = NBD_CMD_FLUSH;
else if (rq_data_dir(req) == WRITE)
type = NBD_CMD_WRITE;
else
type = NBD_CMD_READ;
memset(&request, 0, sizeof(request));
request.magic = htonl(NBD_REQUEST_MAGIC);
request.type = htonl(nbd_cmd(req));
if (nbd_cmd(req) != NBD_CMD_FLUSH && nbd_cmd(req) != NBD_CMD_DISC) {
request.type = htonl(type);
if (type != NBD_CMD_FLUSH && type != NBD_CMD_DISC) {
request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9);
request.len = htonl(size);
}
memcpy(request.handle, &req, sizeof(req));
dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n",
req, nbdcmd_to_ascii(nbd_cmd(req)),
req, nbdcmd_to_ascii(type),
(unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req));
result = sock_xmit(nbd, 1, &request, sizeof(request),
(nbd_cmd(req) == NBD_CMD_WRITE) ? MSG_MORE : 0);
(type == NBD_CMD_WRITE) ? MSG_MORE : 0);
if (result <= 0) {
dev_err(disk_to_dev(nbd->disk),
"Send control failed (result %d)\n", result);
return -EIO;
}
if (nbd_cmd(req) == NBD_CMD_WRITE) {
if (type == NBD_CMD_WRITE) {
struct req_iterator iter;
struct bio_vec bvec;
/*
@ -352,7 +363,7 @@ static struct request *nbd_read_stat(struct nbd_device *nbd)
}
dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", req);
if (nbd_cmd(req) == NBD_CMD_READ) {
if (rq_data_dir(req) != WRITE) {
struct req_iterator iter;
struct bio_vec bvec;
@ -452,24 +463,12 @@ static void nbd_handle_req(struct nbd_device *nbd, struct request *req)
if (req->cmd_type != REQ_TYPE_FS)
goto error_out;
nbd_cmd(req) = NBD_CMD_READ;
if (rq_data_dir(req) == WRITE) {
if ((req->cmd_flags & REQ_DISCARD)) {
WARN_ON(!(nbd->flags & NBD_FLAG_SEND_TRIM));
nbd_cmd(req) = NBD_CMD_TRIM;
} else
nbd_cmd(req) = NBD_CMD_WRITE;
if (nbd->flags & NBD_FLAG_READ_ONLY) {
if (rq_data_dir(req) == WRITE &&
(nbd->flags & NBD_FLAG_READ_ONLY)) {
dev_err(disk_to_dev(nbd->disk),
"Write on read-only\n");
goto error_out;
}
}
if (req->cmd_flags & REQ_FLUSH) {
BUG_ON(unlikely(blk_rq_sectors(req)));
nbd_cmd(req) = NBD_CMD_FLUSH;
}
req->errors = 0;
@ -592,8 +591,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
fsync_bdev(bdev);
mutex_lock(&nbd->tx_lock);
blk_rq_init(NULL, &sreq);
sreq.cmd_type = REQ_TYPE_SPECIAL;
nbd_cmd(&sreq) = NBD_CMD_DISC;
sreq.cmd_type = REQ_TYPE_DRV_PRIV;
/* Check again after getting mutex back. */
if (!nbd->sock)

4
drivers/block/paride/pd.c
View File

@ -442,7 +442,7 @@ static char *pd_buf; /* buffer for request in progress */
static enum action do_pd_io_start(void)
{
if (pd_req->cmd_type == REQ_TYPE_SPECIAL) {
if (pd_req->cmd_type == REQ_TYPE_DRV_PRIV) {
phase = pd_special;
return pd_special();
}
@ -725,7 +725,7 @@ static int pd_special_command(struct pd_unit *disk,
if (IS_ERR(rq))
return PTR_ERR(rq);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
rq->special = func;
err = blk_execute_rq(disk->gd->queue, disk->gd, rq, 0);

4
drivers/block/sx8.c
View File

@ -620,7 +620,7 @@ static int carm_array_info (struct carm_host *host, unsigned int array_idx)
spin_unlock_irq(&host->lock);
DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
crq->rq->cmd_type = REQ_TYPE_SPECIAL;
crq->rq->cmd_type = REQ_TYPE_DRV_PRIV;
crq->rq->special = crq;
blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
@ -661,7 +661,7 @@ static int carm_send_special (struct carm_host *host, carm_sspc_t func)
crq->msg_bucket = (u32) rc;
DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
crq->rq->cmd_type = REQ_TYPE_SPECIAL;
crq->rq->cmd_type = REQ_TYPE_DRV_PRIV;
crq->rq->special = crq;
blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);

6
drivers/block/virtio_blk.c
View File

@ -124,7 +124,7 @@ static inline void virtblk_request_done(struct request *req)
req->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);
req->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);
req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors);
} else if (req->cmd_type == REQ_TYPE_SPECIAL) {
} else if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
req->errors = (error != 0);
}
@ -188,7 +188,7 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
break;
case REQ_TYPE_SPECIAL:
case REQ_TYPE_DRV_PRIV:
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
@ -251,7 +251,7 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str)
return PTR_ERR(req);
}
req->cmd_type = REQ_TYPE_SPECIAL;
req->cmd_type = REQ_TYPE_DRV_PRIV;
err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
blk_put_request(req);

10
drivers/ide/ide-atapi.c
View File

@ -93,7 +93,7 @@ int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
int error;
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
rq->special = (char *)pc;
if (buf && bufflen) {
@ -191,7 +191,7 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
BUG_ON(sense_len > sizeof(*sense));
if (rq->cmd_type == REQ_TYPE_SENSE || drive->sense_rq_armed)
if (rq->cmd_type == REQ_TYPE_ATA_SENSE || drive->sense_rq_armed)
return;
memset(sense, 0, sizeof(*sense));
@ -210,7 +210,7 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
sense_rq->rq_disk = rq->rq_disk;
sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
sense_rq->cmd[4] = cmd_len;
sense_rq->cmd_type = REQ_TYPE_SENSE;
sense_rq->cmd_type = REQ_TYPE_ATA_SENSE;
sense_rq->cmd_flags |= REQ_PREEMPT;
if (drive->media == ide_tape)
@ -310,7 +310,7 @@ int ide_cd_get_xferlen(struct request *rq)
switch (rq->cmd_type) {
case REQ_TYPE_FS:
return 32768;
case REQ_TYPE_SENSE:
case REQ_TYPE_ATA_SENSE:
case REQ_TYPE_BLOCK_PC:
case REQ_TYPE_ATA_PC:
return blk_rq_bytes(rq);
@ -477,7 +477,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
if (uptodate == 0)
drive->failed_pc = NULL;
if (rq->cmd_type == REQ_TYPE_SPECIAL) {
if (rq->cmd_type == REQ_TYPE_DRV_PRIV) {
rq->errors = 0;
error = 0;
} else {

10
drivers/ide/ide-cd.c
View File

@ -210,7 +210,7 @@ static void cdrom_analyze_sense_data(ide_drive_t *drive,
static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
{
/*
* For REQ_TYPE_SENSE, "rq->special" points to the original
* For REQ_TYPE_ATA_SENSE, "rq->special" points to the original
* failed request. Also, the sense data should be read
* directly from rq which might be different from the original
* sense buffer if it got copied during mapping.
@ -285,7 +285,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
"stat 0x%x",
rq->cmd[0], rq->cmd_type, err, stat);
if (rq->cmd_type == REQ_TYPE_SENSE) {
if (rq->cmd_type == REQ_TYPE_ATA_SENSE) {
/*
* We got an error trying to get sense info from the drive
* (probably while trying to recover from a former error).
@ -526,7 +526,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
ide_expiry_t *expiry = NULL;
int dma_error = 0, dma, thislen, uptodate = 0;
int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
int sense = (rq->cmd_type == REQ_TYPE_SENSE);
int sense = (rq->cmd_type == REQ_TYPE_ATA_SENSE);
unsigned int timeout;
u16 len;
u8 ireason, stat;
@ -791,7 +791,7 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
if (cdrom_start_rw(drive, rq) == ide_stopped)
goto out_end;
break;
case REQ_TYPE_SENSE:
case REQ_TYPE_ATA_SENSE:
case REQ_TYPE_BLOCK_PC:
case REQ_TYPE_ATA_PC:
if (!rq->timeout)
@ -799,7 +799,7 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
cdrom_do_block_pc(drive, rq);
break;
case REQ_TYPE_SPECIAL:
case REQ_TYPE_DRV_PRIV:
/* right now this can only be a reset... */
uptodate = 1;
goto out_end;

2
drivers/ide/ide-cd_ioctl.c
View File

@ -304,7 +304,7 @@ int ide_cdrom_reset(struct cdrom_device_info *cdi)
int ret;
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
rq->cmd_flags = REQ_QUIET;
ret = blk_execute_rq(drive->queue, cd->disk, rq, 0);
blk_put_request(rq);

2
drivers/ide/ide-devsets.c
View File

@ -166,7 +166,7 @@ int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
return setting->set(drive, arg);
rq = blk_get_request(q, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
rq->cmd_len = 5;
rq->cmd[0] = REQ_DEVSET_EXEC;
*(int *)&rq->cmd[1] = arg;

4
drivers/ide/ide-eh.c
View File

@ -129,7 +129,7 @@ ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat)
if (cmd)
ide_complete_cmd(drive, cmd, stat, err);
} else if (blk_pm_request(rq)) {
} else if (ata_pm_request(rq)) {
rq->errors = 1;
ide_complete_pm_rq(drive, rq);
return ide_stopped;
@ -147,7 +147,7 @@ static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
{
struct request *rq = drive->hwif->rq;
if (rq && rq->cmd_type == REQ_TYPE_SPECIAL &&
if (rq && rq->cmd_type == REQ_TYPE_DRV_PRIV &&
rq->cmd[0] == REQ_DRIVE_RESET) {
if (err <= 0 && rq->errors == 0)
rq->errors = -EIO;

8
drivers/ide/ide-floppy.c
View File

@ -97,7 +97,7 @@ static int ide_floppy_callback(ide_drive_t *drive, int dsc)
"Aborting request!\n");
}
if (rq->cmd_type == REQ_TYPE_SPECIAL)
if (rq->cmd_type == REQ_TYPE_DRV_PRIV)
rq->errors = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
return uptodate;
@ -246,7 +246,7 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
} else
printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
if (rq->cmd_type == REQ_TYPE_SPECIAL) {
if (rq->cmd_type == REQ_TYPE_DRV_PRIV) {
rq->errors = 0;
ide_complete_rq(drive, 0, blk_rq_bytes(rq));
return ide_stopped;
@ -265,8 +265,8 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
pc = &floppy->queued_pc;
idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
break;
case REQ_TYPE_SPECIAL:
case REQ_TYPE_SENSE:
case REQ_TYPE_DRV_PRIV:
case REQ_TYPE_ATA_SENSE:
pc = (struct ide_atapi_pc *)rq->special;
break;
case REQ_TYPE_BLOCK_PC:

12
drivers/ide/ide-io.c
View File

@ -135,7 +135,7 @@ EXPORT_SYMBOL(ide_complete_rq);
void ide_kill_rq(ide_drive_t *drive, struct request *rq)
{
u8 drv_req = (rq->cmd_type == REQ_TYPE_SPECIAL) && rq->rq_disk;
u8 drv_req = (rq->cmd_type == REQ_TYPE_DRV_PRIV) && rq->rq_disk;
u8 media = drive->media;
drive->failed_pc = NULL;
@ -320,7 +320,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
goto kill_rq;
}
if (blk_pm_request(rq))
if (ata_pm_request(rq))
ide_check_pm_state(drive, rq);
drive->hwif->tp_ops->dev_select(drive);
@ -342,8 +342,8 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
return execute_drive_cmd(drive, rq);
else if (blk_pm_request(rq)) {
struct request_pm_state *pm = rq->special;
else if (ata_pm_request(rq)) {
struct ide_pm_state *pm = rq->special;
#ifdef DEBUG_PM
printk("%s: start_power_step(step: %d)\n",
drive->name, pm->pm_step);
@ -353,7 +353,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
pm->pm_step == IDE_PM_COMPLETED)
ide_complete_pm_rq(drive, rq);
return startstop;
} else if (!rq->rq_disk && rq->cmd_type == REQ_TYPE_SPECIAL)
} else if (!rq->rq_disk && rq->cmd_type == REQ_TYPE_DRV_PRIV)
/*
* TODO: Once all ULDs have been modified to
* check for specific op codes rather than
@ -538,7 +538,7 @@ repeat:
* state machine.
*/
if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
blk_pm_request(rq) == 0 &&
ata_pm_request(rq) == 0 &&
(rq->cmd_flags & REQ_PREEMPT) == 0) {
/* there should be no pending command at this point */
ide_unlock_port(hwif);

2
drivers/ide/ide-ioctls.c
View File

@ -222,7 +222,7 @@ static int generic_drive_reset(ide_drive_t *drive)
int ret = 0;
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
rq->cmd_len = 1;
rq->cmd[0] = REQ_DRIVE_RESET;
if (blk_execute_rq(drive->queue, NULL, rq, 1))

4
drivers/ide/ide-park.c
View File

@ -34,7 +34,7 @@ static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
rq = blk_get_request(q, READ, __GFP_WAIT);
rq->cmd[0] = REQ_PARK_HEADS;
rq->cmd_len = 1;
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
rq->special = &timeout;
rc = blk_execute_rq(q, NULL, rq, 1);
blk_put_request(rq);
@ -51,7 +51,7 @@ static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
rq->cmd[0] = REQ_UNPARK_HEADS;
rq->cmd_len = 1;
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
out:

56
drivers/ide/ide-pm.c
View File

@ -8,7 +8,7 @@ int generic_ide_suspend(struct device *dev, pm_message_t mesg)
ide_drive_t *pair = ide_get_pair_dev(drive);
ide_hwif_t *hwif = drive->hwif;
struct request *rq;
struct request_pm_state rqpm;
struct ide_pm_state rqpm;
int ret;
if (ide_port_acpi(hwif)) {
@ -19,7 +19,7 @@ int generic_ide_suspend(struct device *dev, pm_message_t mesg)
memset(&rqpm, 0, sizeof(rqpm));
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_PM_SUSPEND;
rq->cmd_type = REQ_TYPE_ATA_PM_SUSPEND;
rq->special = &rqpm;
rqpm.pm_step = IDE_PM_START_SUSPEND;
if (mesg.event == PM_EVENT_PRETHAW)
@ -38,13 +38,43 @@ int generic_ide_suspend(struct device *dev, pm_message_t mesg)
return ret;
}
static void ide_end_sync_rq(struct request *rq, int error)
{
complete(rq->end_io_data);
}
static int ide_pm_execute_rq(struct request *rq)
{
struct request_queue *q = rq->q;
DECLARE_COMPLETION_ONSTACK(wait);
rq->end_io_data = &wait;
rq->end_io = ide_end_sync_rq;
spin_lock_irq(q->queue_lock);
if (unlikely(blk_queue_dying(q))) {
rq->cmd_flags |= REQ_QUIET;
rq->errors = -ENXIO;
__blk_end_request_all(rq, rq->errors);
spin_unlock_irq(q->queue_lock);
return -ENXIO;
}
__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
__blk_run_queue_uncond(q);
spin_unlock_irq(q->queue_lock);
wait_for_completion_io(&wait);
return rq->errors ? -EIO : 0;
}
int generic_ide_resume(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
ide_drive_t *pair = ide_get_pair_dev(drive);
ide_hwif_t *hwif = drive->hwif;
struct request *rq;
struct request_pm_state rqpm;
struct ide_pm_state rqpm;
int err;
if (ide_port_acpi(hwif)) {
@ -59,13 +89,13 @@ int generic_ide_resume(struct device *dev)
memset(&rqpm, 0, sizeof(rqpm));
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_PM_RESUME;
rq->cmd_type = REQ_TYPE_ATA_PM_RESUME;
rq->cmd_flags |= REQ_PREEMPT;
rq->special = &rqpm;
rqpm.pm_step = IDE_PM_START_RESUME;
rqpm.pm_state = PM_EVENT_ON;
err = blk_execute_rq(drive->queue, NULL, rq, 1);
err = ide_pm_execute_rq(rq);
blk_put_request(rq);
if (err == 0 && dev->driver) {
@ -80,7 +110,7 @@ int generic_ide_resume(struct device *dev)
void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
{
struct request_pm_state *pm = rq->special;
struct ide_pm_state *pm = rq->special;
#ifdef DEBUG_PM
printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
@ -110,7 +140,7 @@ void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
{
struct request_pm_state *pm = rq->special;
struct ide_pm_state *pm = rq->special;
struct ide_cmd cmd = { };
switch (pm->pm_step) {
@ -182,7 +212,7 @@ out_do_tf:
void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
{
struct request_queue *q = drive->queue;
struct request_pm_state *pm = rq->special;
struct ide_pm_state *pm = rq->special;
unsigned long flags;
ide_complete_power_step(drive, rq);
@ -191,10 +221,10 @@ void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
#ifdef DEBUG_PM
printk("%s: completing PM request, %s\n", drive->name,
(rq->cmd_type == REQ_TYPE_PM_SUSPEND) ? "suspend" : "resume");
(rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND) ? "suspend" : "resume");
#endif
spin_lock_irqsave(q->queue_lock, flags);
if (rq->cmd_type == REQ_TYPE_PM_SUSPEND)
if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND)
blk_stop_queue(q);
else
drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
@ -208,13 +238,13 @@ void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
{
struct request_pm_state *pm = rq->special;
struct ide_pm_state *pm = rq->special;
if (rq->cmd_type == REQ_TYPE_PM_SUSPEND &&
if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND &&
pm->pm_step == IDE_PM_START_SUSPEND)
/* Mark drive blocked when starting the suspend sequence. */
drive->dev_flags |= IDE_DFLAG_BLOCKED;
else if (rq->cmd_type == REQ_TYPE_PM_RESUME &&
else if (rq->cmd_type == REQ_TYPE_ATA_PM_RESUME &&
pm->pm_step == IDE_PM_START_RESUME) {
/*
* The first thing we do on wakeup is to wait for BSY bit to

6
drivers/ide/ide-tape.c
View File

@ -576,8 +576,8 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
rq->cmd[0], (unsigned long long)blk_rq_pos(rq),
blk_rq_sectors(rq));
BUG_ON(!(rq->cmd_type == REQ_TYPE_SPECIAL ||
rq->cmd_type == REQ_TYPE_SENSE));
BUG_ON(!(rq->cmd_type == REQ_TYPE_DRV_PRIV ||
rq->cmd_type == REQ_TYPE_ATA_SENSE));
/* Retry a failed packet command */
if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
@ -853,7 +853,7 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
BUG_ON(size < 0 || size % tape->blk_size);
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_type = REQ_TYPE_DRV_PRIV;
rq->cmd[13] = cmd;
rq->rq_disk = tape->disk;
rq->__sector = tape->first_frame;

2
drivers/ide/ide-taskfile.c
View File

@ -186,7 +186,7 @@ static ide_startstop_t task_no_data_intr(ide_drive_t *drive)
tf->command == ATA_CMD_CHK_POWER) {
struct request *rq = hwif->rq;
if (blk_pm_request(rq))
if (ata_pm_request(rq))
ide_complete_pm_rq(drive, rq);
else
ide_finish_cmd(drive, cmd, stat);

2
drivers/md/bcache/io.c
View File

@ -55,7 +55,7 @@ static void bch_bio_submit_split_done(struct closure *cl)
s->bio->bi_end_io = s->bi_end_io;
s->bio->bi_private = s->bi_private;
bio_endio_nodec(s->bio, 0);
bio_endio(s->bio, 0);
closure_debug_destroy(&s->cl);
mempool_free(s, s->p->bio_split_hook);

2
drivers/md/bcache/request.c
View File

@ -619,7 +619,7 @@ static void do_bio_hook(struct search *s, struct bio *orig_bio)
bio->bi_end_io = request_endio;
bio->bi_private = &s->cl;
atomic_set(&bio->bi_cnt, 3);
bio_cnt_set(bio, 3);
}
static void search_free(struct closure *cl)

6
drivers/md/dm-cache-target.c
View File

@ -86,12 +86,6 @@ static void dm_unhook_bio(struct dm_hook_info *h, struct bio *bio)
{
bio->bi_end_io = h->bi_end_io;
bio->bi_private = h->bi_private;
/*
* Must bump bi_remaining to allow bio to complete with
* restored bi_end_io.
*/
atomic_inc(&bio->bi_remaining);
}
/*----------------------------------------------------------------*/

2
drivers/md/dm-raid1.c
View File

@ -1254,8 +1254,6 @@ static int mirror_end_io(struct dm_target *ti, struct bio *bio, int error)
dm_bio_restore(bd, bio);
bio_record->details.bi_bdev = NULL;
atomic_inc(&bio->bi_remaining);
queue_bio(ms, bio, rw);
return DM_ENDIO_INCOMPLETE;
}

1
drivers/md/dm-snap.c
View File

@ -1478,7 +1478,6 @@ out:
if (full_bio) {
full_bio->bi_end_io = pe->full_bio_end_io;
full_bio->bi_private = pe->full_bio_private;
atomic_inc(&full_bio->bi_remaining);
}
increment_pending_exceptions_done_count();

25
drivers/md/dm-table.c
View File

@ -942,21 +942,28 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
{
unsigned type = dm_table_get_type(t);
unsigned per_bio_data_size = 0;
struct dm_target *tgt;
unsigned i;
if (unlikely(type == DM_TYPE_NONE)) {
switch (type) {
case DM_TYPE_BIO_BASED:
for (i = 0; i < t->num_targets; i++) {
struct dm_target *tgt = t->targets + i;
per_bio_data_size = max(per_bio_data_size,
tgt->per_bio_data_size);
}
t->mempools = dm_alloc_bio_mempools(t->integrity_supported,
per_bio_data_size);
break;
case DM_TYPE_REQUEST_BASED:
case DM_TYPE_MQ_REQUEST_BASED:
t->mempools = dm_alloc_rq_mempools(md, type);
break;
default:
DMWARN("no table type is set, can't allocate mempools");
return -EINVAL;
}
if (type == DM_TYPE_BIO_BASED)
for (i = 0; i < t->num_targets; i++) {
tgt = t->targets + i;
per_bio_data_size = max(per_bio_data_size, tgt->per_bio_data_size);
}
t->mempools = dm_alloc_md_mempools(md, type, t->integrity_supported, per_bio_data_size);
if (!t->mempools)
return -ENOMEM;

9
drivers/md/dm-thin.c
View File

@ -793,10 +793,9 @@ static void inc_remap_and_issue_cell(struct thin_c *tc,
static void process_prepared_mapping_fail(struct dm_thin_new_mapping *m)
{
if (m->bio) {
if (m->bio)
m->bio->bi_end_io = m->saved_bi_end_io;
atomic_inc(&m->bio->bi_remaining);
}
cell_error(m->tc->pool, m->cell);
list_del(&m->list);
mempool_free(m, m->tc->pool->mapping_pool);
@ -810,10 +809,8 @@ static void process_prepared_mapping(struct dm_thin_new_mapping *m)
int r;
bio = m->bio;
if (bio) {
if (bio)
bio->bi_end_io = m->saved_bi_end_io;
atomic_inc(&bio->bi_remaining);
}
if (m->err) {
cell_error(pool, m->cell);

2
drivers/md/dm-verity.c
View File

@ -459,7 +459,7 @@ static void verity_finish_io(struct dm_verity_io *io, int error)
bio->bi_end_io = io->orig_bi_end_io;
bio->bi_private = io->orig_bi_private;
bio_endio_nodec(bio, error);
bio_endio(bio, error);
}
static void verity_work(struct work_struct *w)

167
drivers/md/dm.c
View File

@ -990,57 +990,6 @@ static void clone_endio(struct bio *bio, int error)
dec_pending(io, error);
}
/*
* Partial completion handling for request-based dm
*/
static void end_clone_bio(struct bio *clone, int error)
{
struct dm_rq_clone_bio_info *info =
container_of(clone, struct dm_rq_clone_bio_info, clone);
struct dm_rq_target_io *tio = info->tio;
struct bio *bio = info->orig;
unsigned int nr_bytes = info->orig->bi_iter.bi_size;
bio_put(clone);
if (tio->error)
/*
* An error has already been detected on the request.
* Once error occurred, just let clone->end_io() handle
* the remainder.
*/
return;
else if (error) {
/*
* Don't notice the error to the upper layer yet.
* The error handling decision is made by the target driver,
* when the request is completed.
*/
tio->error = error;
return;
}
/*
* I/O for the bio successfully completed.
* Notice the data completion to the upper layer.
*/
/*
* bios are processed from the head of the list.
* So the completing bio should always be rq->bio.
* If it's not, something wrong is happening.
*/
if (tio->orig->bio != bio)
DMERR("bio completion is going in the middle of the request");
/*
* Update the original request.
* Do not use blk_end_request() here, because it may complete
* the original request before the clone, and break the ordering.
*/
blk_update_request(tio->orig, 0, nr_bytes);
}
static struct dm_rq_target_io *tio_from_request(struct request *rq)
{
return (rq->q->mq_ops ? blk_mq_rq_to_pdu(rq) : rq->special);
@ -1087,8 +1036,6 @@ static void free_rq_clone(struct request *clone)
struct dm_rq_target_io *tio = clone->end_io_data;
struct mapped_device *md = tio->md;
blk_rq_unprep_clone(clone);
if (md->type == DM_TYPE_MQ_REQUEST_BASED)
/* stacked on blk-mq queue(s) */
tio->ti->type->release_clone_rq(clone);
@ -1827,39 +1774,13 @@ static void dm_dispatch_clone_request(struct request *clone, struct request *rq)
dm_complete_request(rq, r);
}
static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig,
void *data)
static void setup_clone(struct request *clone, struct request *rq,
struct dm_rq_target_io *tio)
{
struct dm_rq_target_io *tio = data;
struct dm_rq_clone_bio_info *info =
container_of(bio, struct dm_rq_clone_bio_info, clone);
info->orig = bio_orig;
info->tio = tio;
bio->bi_end_io = end_clone_bio;
return 0;
}
static int setup_clone(struct request *clone, struct request *rq,
struct dm_rq_target_io *tio, gfp_t gfp_mask)
{
int r;
r = blk_rq_prep_clone(clone, rq, tio->md->bs, gfp_mask,
dm_rq_bio_constructor, tio);
if (r)
return r;
clone->cmd = rq->cmd;
clone->cmd_len = rq->cmd_len;
clone->sense = rq->sense;
blk_rq_prep_clone(clone, rq);
clone->end_io = end_clone_request;
clone->end_io_data = tio;
tio->clone = clone;
return 0;
}
static struct request *clone_rq(struct request *rq, struct mapped_device *md,
@ -1880,12 +1801,7 @@ static struct request *clone_rq(struct request *rq, struct mapped_device *md,
clone = tio->clone;
blk_rq_init(NULL, clone);
if (setup_clone(clone, rq, tio, gfp_mask)) {
/* -ENOMEM */
if (alloc_clone)
free_clone_request(md, clone);
return NULL;
}
setup_clone(clone, rq, tio);
return clone;
}
@ -1979,11 +1895,7 @@ static int map_request(struct dm_rq_target_io *tio, struct request *rq,
}
if (r != DM_MAPIO_REMAPPED)
return r;
if (setup_clone(clone, rq, tio, GFP_ATOMIC)) {
/* -ENOMEM */
ti->type->release_clone_rq(clone);
return DM_MAPIO_REQUEUE;
}
setup_clone(clone, rq, tio);
}
switch (r) {
@ -2437,8 +2349,6 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
goto out;
}
BUG_ON(!p || md->io_pool || md->rq_pool || md->bs);
md->io_pool = p->io_pool;
p->io_pool = NULL;
md->rq_pool = p->rq_pool;
@ -3544,48 +3454,23 @@ int dm_noflush_suspending(struct dm_target *ti)
}
EXPORT_SYMBOL_GPL(dm_noflush_suspending);
struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type,
unsigned integrity, unsigned per_bio_data_size)
struct dm_md_mempools *dm_alloc_bio_mempools(unsigned integrity,
unsigned per_bio_data_size)
{
struct dm_md_mempools *pools = kzalloc(sizeof(*pools), GFP_KERNEL);
struct kmem_cache *cachep = NULL;
unsigned int pool_size = 0;
struct dm_md_mempools *pools;
unsigned int pool_size = dm_get_reserved_bio_based_ios();
unsigned int front_pad;
pools = kzalloc(sizeof(*pools), GFP_KERNEL);
if (!pools)
return NULL;
type = filter_md_type(type, md);
front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) +
offsetof(struct dm_target_io, clone);
switch (type) {
case DM_TYPE_BIO_BASED:
cachep = _io_cache;
pool_size = dm_get_reserved_bio_based_ios();
front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
break;
case DM_TYPE_REQUEST_BASED:
cachep = _rq_tio_cache;
pool_size = dm_get_reserved_rq_based_ios();
pools->rq_pool = mempool_create_slab_pool(pool_size, _rq_cache);
if (!pools->rq_pool)
goto out;
/* fall through to setup remaining rq-based pools */
case DM_TYPE_MQ_REQUEST_BASED:
if (!pool_size)
pool_size = dm_get_reserved_rq_based_ios();
front_pad = offsetof(struct dm_rq_clone_bio_info, clone);
/* per_bio_data_size is not used. See __bind_mempools(). */
WARN_ON(per_bio_data_size != 0);
break;
default:
BUG();
}
if (cachep) {
pools->io_pool = mempool_create_slab_pool(pool_size, cachep);
pools->io_pool = mempool_create_slab_pool(pool_size, _io_cache);
if (!pools->io_pool)
goto out;
}
pools->bs = bioset_create_nobvec(pool_size, front_pad);
if (!pools->bs)
@ -3595,10 +3480,34 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned t
goto out;
return pools;
out:
dm_free_md_mempools(pools);
return NULL;
}
struct dm_md_mempools *dm_alloc_rq_mempools(struct mapped_device *md,
unsigned type)
{
unsigned int pool_size = dm_get_reserved_rq_based_ios();
struct dm_md_mempools *pools;
pools = kzalloc(sizeof(*pools), GFP_KERNEL);
if (!pools)
return NULL;
if (filter_md_type(type, md) == DM_TYPE_REQUEST_BASED) {
pools->rq_pool = mempool_create_slab_pool(pool_size, _rq_cache);
if (!pools->rq_pool)
goto out;
}
pools->io_pool = mempool_create_slab_pool(pool_size, _rq_tio_cache);
if (!pools->io_pool)
goto out;
return pools;
out:
dm_free_md_mempools(pools);
return NULL;
}

5
drivers/md/dm.h
View File

@ -222,8 +222,9 @@ void dm_kcopyd_exit(void);
/*
* Mempool operations
*/
struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type,
unsigned integrity, unsigned per_bio_data_size);
struct dm_md_mempools *dm_alloc_bio_mempools(unsigned integrity,
unsigned per_bio_data_size);
struct dm_md_mempools *dm_alloc_rq_mempools(struct mapped_device *md, unsigned type);
void dm_free_md_mempools(struct dm_md_mempools *pools);
/*

13
fs/btrfs/disk-io.c
View File

@ -1745,7 +1745,7 @@ static void end_workqueue_fn(struct btrfs_work *work)
bio->bi_private = end_io_wq->private;
bio->bi_end_io = end_io_wq->end_io;
kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
bio_endio_nodec(bio, error);
bio_endio(bio, error);
}
static int cleaner_kthread(void *arg)
@ -3269,11 +3269,8 @@ static int write_dev_supers(struct btrfs_device *device,
*/
static void btrfs_end_empty_barrier(struct bio *bio, int err)
{
if (err) {
if (err == -EOPNOTSUPP)
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
if (err)
clear_bit(BIO_UPTODATE, &bio->bi_flags);
}
if (bio->bi_private)
complete(bio->bi_private);
bio_put(bio);
@ -3301,11 +3298,7 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
wait_for_completion(&device->flush_wait);
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
printk_in_rcu("BTRFS: disabling barriers on dev %s\n",
rcu_str_deref(device->name));
device->nobarriers = 1;
} else if (!bio_flagged(bio, BIO_UPTODATE)) {
if (!bio_flagged(bio, BIO_UPTODATE)) {
ret = -EIO;
btrfs_dev_stat_inc_and_print(device,
BTRFS_DEV_STAT_FLUSH_ERRS);

2
fs/btrfs/extent_io.c
View File

@ -2767,8 +2767,6 @@ static int __must_check submit_one_bio(int rw, struct bio *bio,
else
btrfsic_submit_bio(rw, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP;
bio_put(bio);
return ret;
}

16
fs/btrfs/volumes.c
View File

@ -345,7 +345,7 @@ loop_lock:
waitqueue_active(&fs_info->async_submit_wait))
wake_up(&fs_info->async_submit_wait);
BUG_ON(atomic_read(&cur->bi_cnt) == 0);
BUG_ON(atomic_read(&cur->__bi_cnt) == 0);
/*
* if we're doing the sync list, record that our
@ -5586,10 +5586,10 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
static inline void btrfs_end_bbio(struct btrfs_bio *bbio, struct bio *bio, int err)
{
if (likely(bbio->flags & BTRFS_BIO_ORIG_BIO_SUBMITTED))
bio_endio_nodec(bio, err);
else
bio->bi_private = bbio->private;
bio->bi_end_io = bbio->end_io;
bio_endio(bio, err);
btrfs_put_bbio(bbio);
}
@ -5633,8 +5633,6 @@ static void btrfs_end_bio(struct bio *bio, int err)
bio = bbio->orig_bio;
}
bio->bi_private = bbio->private;
bio->bi_end_io = bbio->end_io;
btrfs_io_bio(bio)->mirror_num = bbio->mirror_num;
/* only send an error to the higher layers if it is
* beyond the tolerance of the btrfs bio
@ -5816,8 +5814,6 @@ static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical)
/* Shoud be the original bio. */
WARN_ON(bio != bbio->orig_bio);
bio->bi_private = bbio->private;
bio->bi_end_io = bbio->end_io;
btrfs_io_bio(bio)->mirror_num = bbio->mirror_num;
bio->bi_iter.bi_sector = logical >> 9;
@ -5898,10 +5894,8 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
if (dev_nr < total_devs - 1) {
bio = btrfs_bio_clone(first_bio, GFP_NOFS);
BUG_ON(!bio); /* -ENOMEM */
} else {
} else
bio = first_bio;
bbio->flags |= BTRFS_BIO_ORIG_BIO_SUBMITTED;
}
submit_stripe_bio(root, bbio, bio,
bbio->stripes[dev_nr].physical, dev_nr, rw,

2
fs/btrfs/volumes.h
View File

@ -292,8 +292,6 @@ struct btrfs_bio_stripe {
struct btrfs_bio;
typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
#define BTRFS_BIO_ORIG_BIO_SUBMITTED (1 << 0)
struct btrfs_bio {
atomic_t refs;
atomic_t stripes_pending;

13
fs/buffer.c
View File

@ -2938,10 +2938,6 @@ static void end_bio_bh_io_sync(struct bio *bio, int err)
{
struct buffer_head *bh = bio->bi_private;
if (err == -EOPNOTSUPP) {
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
}
if (unlikely (test_bit(BIO_QUIET,&bio->bi_flags)))
set_bit(BH_Quiet, &bh->b_state);
@ -3000,7 +2996,6 @@ void guard_bio_eod(int rw, struct bio *bio)
int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags)
{
struct bio *bio;
int ret = 0;
BUG_ON(!buffer_locked(bh));
BUG_ON(!buffer_mapped(bh));
@ -3041,14 +3036,8 @@ int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags)
if (buffer_prio(bh))
rw |= REQ_PRIO;
bio_get(bio);
submit_bio(rw, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP;
bio_put(bio);
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(_submit_bh);

1
fs/ext4/page-io.c
View File

@ -359,7 +359,6 @@ void ext4_io_submit(struct ext4_io_submit *io)
if (bio) {
bio_get(io->io_bio);
submit_bio(io->io_op, io->io_bio);
BUG_ON(bio_flagged(io->io_bio, BIO_EOPNOTSUPP));
bio_put(io->io_bio);
}
io->io_bio = NULL;

12
fs/nilfs2/segbuf.c
View File

@ -343,11 +343,6 @@ static void nilfs_end_bio_write(struct bio *bio, int err)
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct nilfs_segment_buffer *segbuf = bio->bi_private;
if (err == -EOPNOTSUPP) {
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
/* to be detected by nilfs_segbuf_submit_bio() */
}
if (!uptodate)
atomic_inc(&segbuf->sb_err);
@ -374,15 +369,8 @@ static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
bio->bi_end_io = nilfs_end_bio_write;
bio->bi_private = segbuf;
bio_get(bio);
submit_bio(mode, bio);
segbuf->sb_nbio++;
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
bio_put(bio);
err = -EOPNOTSUPP;
goto failed;
}
bio_put(bio);
wi->bio = NULL;
wi->rest_blocks -= wi->end - wi->start;

1
fs/xfs/xfs_aops.c
View File

@ -356,7 +356,6 @@ xfs_end_bio(
{
xfs_ioend_t *ioend = bio->bi_private;
ASSERT(atomic_read(&bio->bi_cnt) >= 1);
ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error;
/* Toss bio and pass work off to an xfsdatad thread */

17
include/linux/bio.h
View File

@ -290,7 +290,21 @@ static inline unsigned bio_segments(struct bio *bio)
* returns. and then bio would be freed memory when if (bio->bi_flags ...)
* runs
*/
#define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
static inline void bio_get(struct bio *bio)
{
bio->bi_flags |= (1 << BIO_REFFED);
smp_mb__before_atomic();
atomic_inc(&bio->__bi_cnt);
}
static inline void bio_cnt_set(struct bio *bio, unsigned int count)
{
if (count != 1) {
bio->bi_flags |= (1 << BIO_REFFED);
smp_mb__before_atomic();
}
atomic_set(&bio->__bi_cnt, count);
}
enum bip_flags {
BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */
@ -413,7 +427,6 @@ static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
}
extern void bio_endio(struct bio *, int);
extern void bio_endio_nodec(struct bio *, int);
struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);

4
include/linux/blk-mq.h
View File

@ -96,6 +96,7 @@ typedef void (exit_request_fn)(void *, struct request *, unsigned int,
typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
bool);
typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
struct blk_mq_ops {
/*
@ -182,6 +183,7 @@ bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
gfp_t gfp, bool reserved);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags);
enum {
BLK_MQ_UNIQUE_TAG_BITS = 16,
@ -224,6 +226,8 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async);
void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,
void *priv);
void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
void *priv);
void blk_mq_freeze_queue(struct request_queue *q);
void blk_mq_unfreeze_queue(struct request_queue *q);
void blk_mq_freeze_queue_start(struct request_queue *q);

25
include/linux/blk_types.h
View File

@ -65,7 +65,7 @@ struct bio {
unsigned int bi_seg_front_size;
unsigned int bi_seg_back_size;
atomic_t bi_remaining;
atomic_t __bi_remaining;
bio_end_io_t *bi_end_io;
@ -92,7 +92,7 @@ struct bio {
unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
atomic_t bi_cnt; /* pin count */
atomic_t __bi_cnt; /* pin count */
struct bio_vec *bi_io_vec; /* the actual vec list */
@ -112,16 +112,15 @@ struct bio {
* bio flags
*/
#define BIO_UPTODATE 0 /* ok after I/O completion */
#define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
#define BIO_EOF 2 /* out-out-bounds error */
#define BIO_SEG_VALID 3 /* bi_phys_segments valid */
#define BIO_CLONED 4 /* doesn't own data */
#define BIO_BOUNCED 5 /* bio is a bounce bio */
#define BIO_USER_MAPPED 6 /* contains user pages */
#define BIO_EOPNOTSUPP 7 /* not supported */
#define BIO_NULL_MAPPED 8 /* contains invalid user pages */
#define BIO_QUIET 9 /* Make BIO Quiet */
#define BIO_SNAP_STABLE 10 /* bio data must be snapshotted during write */
#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
#define BIO_CLONED 2 /* doesn't own data */
#define BIO_BOUNCED 3 /* bio is a bounce bio */
#define BIO_USER_MAPPED 4 /* contains user pages */
#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
#define BIO_QUIET 6 /* Make BIO Quiet */
#define BIO_SNAP_STABLE 7 /* bio data must be snapshotted during write */
#define BIO_CHAIN 8 /* chained bio, ->bi_remaining in effect */
#define BIO_REFFED 9 /* bio has elevated ->bi_cnt */
/*
* Flags starting here get preserved by bio_reset() - this includes
@ -193,6 +192,7 @@ enum rq_flag_bits {
__REQ_HASHED, /* on IO scheduler merge hash */
__REQ_MQ_INFLIGHT, /* track inflight for MQ */
__REQ_NO_TIMEOUT, /* requests may never expire */
__REQ_CLONE, /* cloned bios */
__REQ_NR_BITS, /* stops here */
};
@ -247,5 +247,6 @@ enum rq_flag_bits {
#define REQ_HASHED (1ULL << __REQ_HASHED)
#define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT)
#define REQ_NO_TIMEOUT (1ULL << __REQ_NO_TIMEOUT)
#define REQ_CLONE (1ULL << __REQ_CLONE)
#endif /* __LINUX_BLK_TYPES_H */

45
include/linux/blkdev.h
View File

@ -30,7 +30,6 @@ struct scsi_ioctl_command;
struct request_queue;
struct elevator_queue;
struct request_pm_state;
struct blk_trace;
struct request;
struct sg_io_hdr;
@ -75,18 +74,7 @@ struct request_list {
enum rq_cmd_type_bits {
REQ_TYPE_FS = 1, /* fs request */
REQ_TYPE_BLOCK_PC, /* scsi command */
REQ_TYPE_SENSE, /* sense request */
REQ_TYPE_PM_SUSPEND, /* suspend request */
REQ_TYPE_PM_RESUME, /* resume request */
REQ_TYPE_PM_SHUTDOWN, /* shutdown request */
REQ_TYPE_SPECIAL, /* driver defined type */
/*
* for ATA/ATAPI devices. this really doesn't belong here, ide should
* use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
* private REQ_LB opcodes to differentiate what type of request this is
*/
REQ_TYPE_ATA_TASKFILE,
REQ_TYPE_ATA_PC,
REQ_TYPE_DRV_PRIV, /* driver defined types from here */
};
#define BLK_MAX_CDB 16
@ -108,7 +96,7 @@ struct request {
struct blk_mq_ctx *mq_ctx;
u64 cmd_flags;
enum rq_cmd_type_bits cmd_type;
unsigned cmd_type;
unsigned long atomic_flags;
int cpu;
@ -216,19 +204,6 @@ static inline unsigned short req_get_ioprio(struct request *req)
return req->ioprio;
}
/*
* State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
* requests. Some step values could eventually be made generic.
*/
struct request_pm_state
{
/* PM state machine step value, currently driver specific */
int pm_step;
/* requested PM state value (S1, S2, S3, S4, ...) */
u32 pm_state;
void* data; /* for driver use */
};
#include <linux/elevator.h>
struct blk_queue_ctx;
@ -469,7 +444,7 @@ struct request_queue {
struct mutex sysfs_lock;
int bypass_depth;
int mq_freeze_depth;
atomic_t mq_freeze_depth;
#if defined(CONFIG_BLK_DEV_BSG)
bsg_job_fn *bsg_job_fn;
@ -610,10 +585,6 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
(((rq)->cmd_flags & REQ_STARTED) && \
((rq)->cmd_type == REQ_TYPE_FS))
#define blk_pm_request(rq) \
((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
(rq)->cmd_type == REQ_TYPE_PM_RESUME)
#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
/* rq->queuelist of dequeued request must be list_empty() */
@ -804,11 +775,7 @@ extern void blk_add_request_payload(struct request *rq, struct page *page,
unsigned int len);
extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
extern int blk_lld_busy(struct request_queue *q);
extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
struct bio_set *bs, gfp_t gfp_mask,
int (*bio_ctr)(struct bio *, struct bio *, void *),
void *data);
extern void blk_rq_unprep_clone(struct request *rq);
extern void blk_rq_prep_clone(struct request *rq, struct request *rq_src);
extern int blk_insert_cloned_request(struct request_queue *q,
struct request *rq);
extern void blk_delay_queue(struct request_queue *, unsigned long);
@ -845,6 +812,7 @@ extern void blk_stop_queue(struct request_queue *q);
extern void blk_sync_queue(struct request_queue *q);
extern void __blk_stop_queue(struct request_queue *q);
extern void __blk_run_queue(struct request_queue *q);
extern void __blk_run_queue_uncond(struct request_queue *q);
extern void blk_run_queue(struct request_queue *);
extern void blk_run_queue_async(struct request_queue *q);
extern int blk_rq_map_user(struct request_queue *, struct request *,
@ -933,7 +901,7 @@ static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC))
return q->limits.max_hw_sectors;
if (!q->limits.chunk_sectors)
if (!q->limits.chunk_sectors || (rq->cmd_flags & REQ_DISCARD))
return blk_queue_get_max_sectors(q, rq->cmd_flags);
return min(blk_max_size_offset(q, blk_rq_pos(rq)),
@ -1054,6 +1022,7 @@ bool __must_check blk_get_queue(struct request_queue *);
struct request_queue *blk_alloc_queue(gfp_t);
struct request_queue *blk_alloc_queue_node(gfp_t, int);
extern void blk_put_queue(struct request_queue *);
extern void blk_set_queue_dying(struct request_queue *);
/*
* block layer runtime pm functions

2
include/linux/elevator.h
View File

@ -39,6 +39,7 @@ typedef void (elevator_deactivate_req_fn) (struct request_queue *, struct reques
typedef int (elevator_init_fn) (struct request_queue *,
struct elevator_type *e);
typedef void (elevator_exit_fn) (struct elevator_queue *);
typedef void (elevator_registered_fn) (struct request_queue *);
struct elevator_ops
{
@ -68,6 +69,7 @@ struct elevator_ops
elevator_init_fn *elevator_init_fn;
elevator_exit_fn *elevator_exit_fn;
elevator_registered_fn *elevator_registered_fn;
};
#define ELV_NAME_MAX (16)

3
include/linux/fs.h
View File

@ -2280,6 +2280,9 @@ extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
void *holder);
extern void blkdev_put(struct block_device *bdev, fmode_t mode);
extern int __blkdev_reread_part(struct block_device *bdev);
extern int blkdev_reread_part(struct block_device *bdev);
#ifdef CONFIG_SYSFS
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
extern void bd_unlink_disk_holder(struct block_device *bdev,

27
include/linux/ide.h
View File

@ -39,6 +39,19 @@
struct device;
/* IDE-specific values for req->cmd_type */
enum ata_cmd_type_bits {
REQ_TYPE_ATA_TASKFILE = REQ_TYPE_DRV_PRIV + 1,
REQ_TYPE_ATA_PC,
REQ_TYPE_ATA_SENSE, /* sense request */
REQ_TYPE_ATA_PM_SUSPEND,/* suspend request */
REQ_TYPE_ATA_PM_RESUME, /* resume request */
};
#define ata_pm_request(rq) \
((rq)->cmd_type == REQ_TYPE_ATA_PM_SUSPEND || \
(rq)->cmd_type == REQ_TYPE_ATA_PM_RESUME)
/* Error codes returned in rq->errors to the higher part of the driver. */
enum {
IDE_DRV_ERROR_GENERAL = 101,
@ -1314,6 +1327,19 @@ struct ide_port_info {
u8 udma_mask;
};
/*
* State information carried for REQ_TYPE_ATA_PM_SUSPEND and REQ_TYPE_ATA_PM_RESUME
* requests.
*/
struct ide_pm_state {
/* PM state machine step value, currently driver specific */
int pm_step;
/* requested PM state value (S1, S2, S3, S4, ...) */
u32 pm_state;
void* data; /* for driver use */
};
int ide_pci_init_one(struct pci_dev *, const struct ide_port_info *, void *);
int ide_pci_init_two(struct pci_dev *, struct pci_dev *,
const struct ide_port_info *, void *);
@ -1551,4 +1577,5 @@ static inline void ide_set_drivedata(ide_drive_t *drive, void *data)
#define ide_host_for_each_port(i, port, host) \
for ((i) = 0; ((port) = (host)->ports[i]) || (i) < MAX_HOST_PORTS; (i)++)
#endif /* _IDE_H */

1
include/linux/swap.h
View File

@ -377,7 +377,6 @@ extern void end_swap_bio_write(struct bio *bio, int err);
extern int __swap_writepage(struct page *page, struct writeback_control *wbc,
void (*end_write_func)(struct bio *, int));
extern int swap_set_page_dirty(struct page *page);
extern void end_swap_bio_read(struct bio *bio, int err);
int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
unsigned long nr_pages, sector_t start_block);

2
include/uapi/linux/nbd.h
View File

@ -44,8 +44,6 @@ enum {
/* there is a gap here to match userspace */
#define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */
#define nbd_cmd(req) ((req)->cmd[0])
/* userspace doesn't need the nbd_device structure */
/* These are sent over the network in the request/reply magic fields */

3
kernel/power/Makefile
View File

@ -7,8 +7,7 @@ obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o
obj-$(CONFIG_FREEZER) += process.o
obj-$(CONFIG_SUSPEND) += suspend.o
obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \
block_io.o
obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o
obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o

103
kernel/power/block_io.c
View File

@ -1,103 +0,0 @@
/*
* This file provides functions for block I/O operations on swap/file.
*
* Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
*
* This file is released under the GPLv2.
*/
#include <linux/bio.h>
#include <linux/kernel.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include "power.h"
/**
* submit - submit BIO request.
* @rw: READ or WRITE.
* @off physical offset of page.
* @page: page we're reading or writing.
* @bio_chain: list of pending biod (for async reading)
*
* Straight from the textbook - allocate and initialize the bio.
* If we're reading, make sure the page is marked as dirty.
* Then submit it and, if @bio_chain == NULL, wait.
*/
static int submit(int rw, struct block_device *bdev, sector_t sector,
struct page *page, struct bio **bio_chain)
{
const int bio_rw = rw | REQ_SYNC;
struct bio *bio;
bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
bio->bi_iter.bi_sector = sector;
bio->bi_bdev = bdev;
bio->bi_end_io = end_swap_bio_read;
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
printk(KERN_ERR "PM: Adding page to bio failed at %llu\n",
(unsigned long long)sector);
bio_put(bio);
return -EFAULT;
}
lock_page(page);
bio_get(bio);
if (bio_chain == NULL) {
submit_bio(bio_rw, bio);
wait_on_page_locked(page);
if (rw == READ)
bio_set_pages_dirty(bio);
bio_put(bio);
} else {
if (rw == READ)
get_page(page); /* These pages are freed later */
bio->bi_private = *bio_chain;
*bio_chain = bio;
submit_bio(bio_rw, bio);
}
return 0;
}
int hib_bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
{
return submit(READ, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
virt_to_page(addr), bio_chain);
}
int hib_bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
{
return submit(WRITE, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
virt_to_page(addr), bio_chain);
}
int hib_wait_on_bio_chain(struct bio **bio_chain)
{
struct bio *bio;
struct bio *next_bio;
int ret = 0;
if (bio_chain == NULL)
return 0;
bio = *bio_chain;
if (bio == NULL)
return 0;
while (bio) {
struct page *page;
next_bio = bio->bi_private;
page = bio->bi_io_vec[0].bv_page;
wait_on_page_locked(page);
if (!PageUptodate(page) || PageError(page))
ret = -EIO;
put_page(page);
bio_put(bio);
bio = next_bio;
}
*bio_chain = NULL;
return ret;
}

9
kernel/power/power.h
View File

@ -163,15 +163,6 @@ extern void swsusp_close(fmode_t);
extern int swsusp_unmark(void);
#endif
/* kernel/power/block_io.c */
extern struct block_device *hib_resume_bdev;
extern int hib_bio_read_page(pgoff_t page_off, void *addr,
struct bio **bio_chain);
extern int hib_bio_write_page(pgoff_t page_off, void *addr,
struct bio **bio_chain);
extern int hib_wait_on_bio_chain(struct bio **bio_chain);
struct timeval;
/* kernel/power/swsusp.c */
extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);

159
kernel/power/swap.c
View File

@ -212,7 +212,84 @@ int swsusp_swap_in_use(void)
*/
static unsigned short root_swap = 0xffff;
struct block_device *hib_resume_bdev;
static struct block_device *hib_resume_bdev;
struct hib_bio_batch {
atomic_t count;
wait_queue_head_t wait;
int error;
};
static void hib_init_batch(struct hib_bio_batch *hb)
{
atomic_set(&hb->count, 0);
init_waitqueue_head(&hb->wait);
hb->error = 0;
}
static void hib_end_io(struct bio *bio, int error)
{
struct hib_bio_batch *hb = bio->bi_private;
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct page *page = bio->bi_io_vec[0].bv_page;
if (!uptodate || error) {
printk(KERN_ALERT "Read-error on swap-device (%u:%u:%Lu)\n",
imajor(bio->bi_bdev->bd_inode),
iminor(bio->bi_bdev->bd_inode),
(unsigned long long)bio->bi_iter.bi_sector);
if (!error)
error = -EIO;
}
if (bio_data_dir(bio) == WRITE)
put_page(page);
if (error && !hb->error)
hb->error = error;
if (atomic_dec_and_test(&hb->count))
wake_up(&hb->wait);
bio_put(bio);
}
static int hib_submit_io(int rw, pgoff_t page_off, void *addr,
struct hib_bio_batch *hb)
{
struct page *page = virt_to_page(addr);
struct bio *bio;
int error = 0;
bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9);
bio->bi_bdev = hib_resume_bdev;
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
printk(KERN_ERR "PM: Adding page to bio failed at %llu\n",
(unsigned long long)bio->bi_iter.bi_sector);
bio_put(bio);
return -EFAULT;
}
if (hb) {
bio->bi_end_io = hib_end_io;
bio->bi_private = hb;
atomic_inc(&hb->count);
submit_bio(rw, bio);
} else {
error = submit_bio_wait(rw, bio);
bio_put(bio);
}
return error;
}
static int hib_wait_io(struct hib_bio_batch *hb)
{
wait_event(hb->wait, atomic_read(&hb->count) == 0);
return hb->error;
}
/*
* Saving part
@ -222,7 +299,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
{
int error;
hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
hib_submit_io(READ_SYNC, swsusp_resume_block, swsusp_header, NULL);
if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
!memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
@ -231,7 +308,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
swsusp_header->flags = flags;
if (flags & SF_CRC32_MODE)
swsusp_header->crc32 = handle->crc32;
error = hib_bio_write_page(swsusp_resume_block,
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
swsusp_header, NULL);
} else {
printk(KERN_ERR "PM: Swap header not found!\n");
@ -271,10 +348,10 @@ static int swsusp_swap_check(void)
* write_page - Write one page to given swap location.
* @buf: Address we're writing.
* @offset: Offset of the swap page we're writing to.
* @bio_chain: Link the next write BIO here
* @hb: bio completion batch
*/
static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb)
{
void *src;
int ret;
@ -282,13 +359,13 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
if (!offset)
return -ENOSPC;
if (bio_chain) {
if (hb) {
src = (void *)__get_free_page(__GFP_WAIT | __GFP_NOWARN |
__GFP_NORETRY);
if (src) {
copy_page(src, buf);
} else {
ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */
ret = hib_wait_io(hb); /* Free pages */
if (ret)
return ret;
src = (void *)__get_free_page(__GFP_WAIT |
@ -298,14 +375,14 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
copy_page(src, buf);
} else {
WARN_ON_ONCE(1);
bio_chain = NULL; /* Go synchronous */
hb = NULL; /* Go synchronous */
src = buf;
}
}
} else {
src = buf;
}
return hib_bio_write_page(offset, src, bio_chain);
return hib_submit_io(WRITE_SYNC, offset, src, hb);
}
static void release_swap_writer(struct swap_map_handle *handle)
@ -348,7 +425,7 @@ err_close:
}
static int swap_write_page(struct swap_map_handle *handle, void *buf,
struct bio **bio_chain)
struct hib_bio_batch *hb)
{
int error = 0;
sector_t offset;
@ -356,7 +433,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
if (!handle->cur)
return -EINVAL;
offset = alloc_swapdev_block(root_swap);
error = write_page(buf, offset, bio_chain);
error = write_page(buf, offset, hb);
if (error)
return error;
handle->cur->entries[handle->k++] = offset;
@ -365,15 +442,15 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
if (!offset)
return -ENOSPC;
handle->cur->next_swap = offset;
error = write_page(handle->cur, handle->cur_swap, bio_chain);
error = write_page(handle->cur, handle->cur_swap, hb);
if (error)
goto out;
clear_page(handle->cur);
handle->cur_swap = offset;
handle->k = 0;
if (bio_chain && low_free_pages() <= handle->reqd_free_pages) {
error = hib_wait_on_bio_chain(bio_chain);
if (hb && low_free_pages() <= handle->reqd_free_pages) {
error = hib_wait_io(hb);
if (error)
goto out;
/*
@ -445,23 +522,24 @@ static int save_image(struct swap_map_handle *handle,
int ret;
int nr_pages;
int err2;
struct bio *bio;
struct hib_bio_batch hb;
ktime_t start;
ktime_t stop;
hib_init_batch(&hb);
printk(KERN_INFO "PM: Saving image data pages (%u pages)...\n",
nr_to_write);
m = nr_to_write / 10;
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
while (1) {
ret = snapshot_read_next(snapshot);
if (ret <= 0)
break;
ret = swap_write_page(handle, data_of(*snapshot), &bio);
ret = swap_write_page(handle, data_of(*snapshot), &hb);
if (ret)
break;
if (!(nr_pages % m))
@ -469,7 +547,7 @@ static int save_image(struct swap_map_handle *handle,
nr_pages / m * 10);
nr_pages++;
}
err2 = hib_wait_on_bio_chain(&bio);
err2 = hib_wait_io(&hb);
stop = ktime_get();
if (!ret)
ret = err2;
@ -580,7 +658,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
int ret = 0;
int nr_pages;
int err2;
struct bio *bio;
struct hib_bio_batch hb;
ktime_t start;
ktime_t stop;
size_t off;
@ -589,6 +667,8 @@ static int save_image_lzo(struct swap_map_handle *handle,
struct cmp_data *data = NULL;
struct crc_data *crc = NULL;
hib_init_batch(&hb);
/*
* We'll limit the number of threads for compression to limit memory
* footprint.
@ -674,7 +754,6 @@ static int save_image_lzo(struct swap_map_handle *handle,
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
for (;;) {
for (thr = 0; thr < nr_threads; thr++) {
@ -748,7 +827,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
off += PAGE_SIZE) {
memcpy(page, data[thr].cmp + off, PAGE_SIZE);
ret = swap_write_page(handle, page, &bio);
ret = swap_write_page(handle, page, &hb);
if (ret)
goto out_finish;
}
@ -759,7 +838,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
}
out_finish:
err2 = hib_wait_on_bio_chain(&bio);
err2 = hib_wait_io(&hb);
stop = ktime_get();
if (!ret)
ret = err2;
@ -906,7 +985,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
return -ENOMEM;
}
error = hib_bio_read_page(offset, tmp->map, NULL);
error = hib_submit_io(READ_SYNC, offset, tmp->map, NULL);
if (error) {
release_swap_reader(handle);
return error;
@ -919,7 +998,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
}
static int swap_read_page(struct swap_map_handle *handle, void *buf,
struct bio **bio_chain)
struct hib_bio_batch *hb)
{
sector_t offset;
int error;
@ -930,7 +1009,7 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
offset = handle->cur->entries[handle->k];
if (!offset)
return -EFAULT;
error = hib_bio_read_page(offset, buf, bio_chain);
error = hib_submit_io(READ_SYNC, offset, buf, hb);
if (error)
return error;
if (++handle->k >= MAP_PAGE_ENTRIES) {
@ -968,27 +1047,28 @@ static int load_image(struct swap_map_handle *handle,
int ret = 0;
ktime_t start;
ktime_t stop;
struct bio *bio;
struct hib_bio_batch hb;
int err2;
unsigned nr_pages;
hib_init_batch(&hb);
printk(KERN_INFO "PM: Loading image data pages (%u pages)...\n",
nr_to_read);
m = nr_to_read / 10;
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
for ( ; ; ) {
ret = snapshot_write_next(snapshot);
if (ret <= 0)
break;
ret = swap_read_page(handle, data_of(*snapshot), &bio);
ret = swap_read_page(handle, data_of(*snapshot), &hb);
if (ret)
break;
if (snapshot->sync_read)
ret = hib_wait_on_bio_chain(&bio);
ret = hib_wait_io(&hb);
if (ret)
break;
if (!(nr_pages % m))
@ -996,7 +1076,7 @@ static int load_image(struct swap_map_handle *handle,
nr_pages / m * 10);
nr_pages++;
}
err2 = hib_wait_on_bio_chain(&bio);
err2 = hib_wait_io(&hb);
stop = ktime_get();
if (!ret)
ret = err2;
@ -1067,7 +1147,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
unsigned int m;
int ret = 0;
int eof = 0;
struct bio *bio;
struct hib_bio_batch hb;
ktime_t start;
ktime_t stop;
unsigned nr_pages;
@ -1080,6 +1160,8 @@ static int load_image_lzo(struct swap_map_handle *handle,
struct dec_data *data = NULL;
struct crc_data *crc = NULL;
hib_init_batch(&hb);
/*
* We'll limit the number of threads for decompression to limit memory
* footprint.
@ -1190,7 +1272,6 @@ static int load_image_lzo(struct swap_map_handle *handle,
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
ret = snapshot_write_next(snapshot);
@ -1199,7 +1280,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
for(;;) {
for (i = 0; !eof && i < want; i++) {
ret = swap_read_page(handle, page[ring], &bio);
ret = swap_read_page(handle, page[ring], &hb);
if (ret) {
/*
* On real read error, finish. On end of data,
@ -1226,7 +1307,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
if (!asked)
break;
ret = hib_wait_on_bio_chain(&bio);
ret = hib_wait_io(&hb);
if (ret)
goto out_finish;
have += asked;
@ -1281,7 +1362,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
* Wait for more data while we are decompressing.
*/
if (have < LZO_CMP_PAGES && asked) {
ret = hib_wait_on_bio_chain(&bio);
ret = hib_wait_io(&hb);
if (ret)
goto out_finish;
have += asked;
@ -1430,7 +1511,7 @@ int swsusp_check(void)
if (!IS_ERR(hib_resume_bdev)) {
set_blocksize(hib_resume_bdev, PAGE_SIZE);
clear_page(swsusp_header);
error = hib_bio_read_page(swsusp_resume_block,
error = hib_submit_io(READ_SYNC, swsusp_resume_block,
swsusp_header, NULL);
if (error)
goto put;
@ -1438,7 +1519,7 @@ int swsusp_check(void)
if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
/* Reset swap signature now */
error = hib_bio_write_page(swsusp_resume_block,
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
swsusp_header, NULL);
} else {
error = -EINVAL;
@ -1482,10 +1563,10 @@ int swsusp_unmark(void)
{
int error;
hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
hib_submit_io(READ_SYNC, swsusp_resume_block, swsusp_header, NULL);
if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
error = hib_bio_write_page(swsusp_resume_block,
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
swsusp_header, NULL);
} else {
printk(KERN_ERR "PM: Cannot find swsusp signature!\n");

2
mm/page_io.c
View File

@ -69,7 +69,7 @@ void end_swap_bio_write(struct bio *bio, int err)
bio_put(bio);
}
void end_swap_bio_read(struct bio *bio, int err)
static void end_swap_bio_read(struct bio *bio, int err)
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct page *page = bio->bi_io_vec[0].bv_page;