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Merge branch 'for-3.2/core' of git://git.kernel.dk/linux-block 

* 'for-3.2/core' of git://git.kernel.dk/linux-block: (29 commits)
  block: don't call blk_drain_queue() if elevator is not up
  blk-throttle: use queue_is_locked() instead of lockdep_is_held()
  blk-throttle: Take blkcg->lock while traversing blkcg->policy_list
  blk-throttle: Free up policy node associated with deleted rule
  block: warn if tag is greater than real_max_depth.
  block: make gendisk hold a reference to its queue
  blk-flush: move the queue kick into
  blk-flush: fix invalid BUG_ON in blk_insert_flush
  block: Remove the control of complete cpu from bio.
  block: fix a typo in the blk-cgroup.h file
  block: initialize the bounce pool if high memory may be added later
  block: fix request_queue lifetime handling by making blk_queue_cleanup() properly shutdown
  block: drop @tsk from attempt_plug_merge() and explain sync rules
  block: make get_request[_wait]() fail if queue is dead
  block: reorganize throtl_get_tg() and blk_throtl_bio()
  block: reorganize queue draining
  block: drop unnecessary blk_get/put_queue() in scsi_cmd_ioctl() and blk_get_tg()
  block: pass around REQ_* flags instead of broken down booleans during request alloc/free
  block: move blk_throtl prototypes to block/blk.h
  block: fix genhd refcounting in blkio_policy_parse_and_set()
  ...

Fix up trivial conflicts due to "mddev_t" -> "struct mddev" conversion
and making the request functions be of type "void" instead of "int" in
 - drivers/md/{faulty.c,linear.c,md.c,md.h,multipath.c,raid0.c,raid1.c,raid10.c,raid5.c}
 - drivers/staging/zram/zram_drv.c
This commit is contained in:
Linus Torvalds 2011-11-04 17:06:58 -07:00
parent 044595d4e4 6dd9ad7df2
commit b4fdcb02f1
42 changed files with 596 additions and 630 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/m68k/emu/nfblock.c
View File

@ -59,7 +59,7 @@ struct nfhd_device {
struct gendisk *disk;
};
static int nfhd_make_request(struct request_queue *queue, struct bio *bio)
static void nfhd_make_request(struct request_queue *queue, struct bio *bio)
{
struct nfhd_device *dev = queue->queuedata;
struct bio_vec *bvec;
@ -76,7 +76,6 @@ static int nfhd_make_request(struct request_queue *queue, struct bio *bio)
sec += len;
}
bio_endio(bio, 0);
return 0;
}
static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)

8
arch/powerpc/sysdev/axonram.c
View File

@ -104,7 +104,7 @@ axon_ram_irq_handler(int irq, void *dev)
* axon_ram_make_request - make_request() method for block device
* @queue, @bio: see blk_queue_make_request()
*/
static int
static void
axon_ram_make_request(struct request_queue *queue, struct bio *bio)
{
struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data;
@ -113,7 +113,6 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio)
struct bio_vec *vec;
unsigned int transfered;
unsigned short idx;
int rc = 0;
phys_mem = bank->io_addr + (bio->bi_sector << AXON_RAM_SECTOR_SHIFT);
phys_end = bank->io_addr + bank->size;
@ -121,8 +120,7 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio)
bio_for_each_segment(vec, bio, idx) {
if (unlikely(phys_mem + vec->bv_len > phys_end)) {
bio_io_error(bio);
rc = -ERANGE;
break;
return;
}
user_mem = page_address(vec->bv_page) + vec->bv_offset;
@ -135,8 +133,6 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio)
transfered += vec->bv_len;
}
bio_endio(bio, 0);
return rc;
}
/**

111
block/blk-cgroup.c
View File

@ -768,25 +768,14 @@ static uint64_t blkio_get_stat(struct blkio_group *blkg,
return disk_total;
}
static int blkio_check_dev_num(dev_t dev)
{
int part = 0;
struct gendisk *disk;
disk = get_gendisk(dev, &part);
if (!disk || part)
return -ENODEV;
return 0;
}
static int blkio_policy_parse_and_set(char *buf,
struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid)
{
struct gendisk *disk = NULL;
char *s[4], *p, *major_s = NULL, *minor_s = NULL;
int ret;
unsigned long major, minor;
int i = 0;
int i = 0, ret = -EINVAL;
int part;
dev_t dev;
u64 temp;
@ -804,37 +793,36 @@ static int blkio_policy_parse_and_set(char *buf,
}
if (i != 2)
return -EINVAL;
goto out;
p = strsep(&s[0], ":");
if (p != NULL)
major_s = p;
else
return -EINVAL;
goto out;
minor_s = s[0];
if (!minor_s)
return -EINVAL;
goto out;
ret = strict_strtoul(major_s, 10, &major);
if (ret)
return -EINVAL;
if (strict_strtoul(major_s, 10, &major))
goto out;
ret = strict_strtoul(minor_s, 10, &minor);
if (ret)
return -EINVAL;
if (strict_strtoul(minor_s, 10, &minor))
goto out;
dev = MKDEV(major, minor);
ret = strict_strtoull(s[1], 10, &temp);
if (ret)
return -EINVAL;
if (strict_strtoull(s[1], 10, &temp))
goto out;
/* For rule removal, do not check for device presence. */
if (temp) {
ret = blkio_check_dev_num(dev);
if (ret)
return ret;
disk = get_gendisk(dev, &part);
if (!disk || part) {
ret = -ENODEV;
goto out;
}
}
newpn->dev = dev;
@ -843,7 +831,7 @@ static int blkio_policy_parse_and_set(char *buf,
case BLKIO_POLICY_PROP:
if ((temp < BLKIO_WEIGHT_MIN && temp > 0) ||
temp > BLKIO_WEIGHT_MAX)
return -EINVAL;
goto out;
newpn->plid = plid;
newpn->fileid = fileid;
@ -860,7 +848,7 @@ static int blkio_policy_parse_and_set(char *buf,
case BLKIO_THROTL_read_iops_device:
case BLKIO_THROTL_write_iops_device:
if (temp > THROTL_IOPS_MAX)
return -EINVAL;
goto out;
newpn->plid = plid;
newpn->fileid = fileid;
@ -871,68 +859,96 @@ static int blkio_policy_parse_and_set(char *buf,
default:
BUG();
}
return 0;
ret = 0;
out:
put_disk(disk);
return ret;
}
unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
dev_t dev)
{
struct blkio_policy_node *pn;
unsigned long flags;
unsigned int weight;
spin_lock_irqsave(&blkcg->lock, flags);
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP,
BLKIO_PROP_weight_device);
if (pn)
return pn->val.weight;
weight = pn->val.weight;
else
return blkcg->weight;
weight = blkcg->weight;
spin_unlock_irqrestore(&blkcg->lock, flags);
return weight;
}
EXPORT_SYMBOL_GPL(blkcg_get_weight);
uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev)
{
struct blkio_policy_node *pn;
unsigned long flags;
uint64_t bps = -1;
spin_lock_irqsave(&blkcg->lock, flags);
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
BLKIO_THROTL_read_bps_device);
if (pn)
return pn->val.bps;
else
return -1;
bps = pn->val.bps;
spin_unlock_irqrestore(&blkcg->lock, flags);
return bps;
}
uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev)
{
struct blkio_policy_node *pn;
unsigned long flags;
uint64_t bps = -1;
spin_lock_irqsave(&blkcg->lock, flags);
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
BLKIO_THROTL_write_bps_device);
if (pn)
return pn->val.bps;
else
return -1;
bps = pn->val.bps;
spin_unlock_irqrestore(&blkcg->lock, flags);
return bps;
}
unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev)
{
struct blkio_policy_node *pn;
unsigned long flags;
unsigned int iops = -1;
spin_lock_irqsave(&blkcg->lock, flags);
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
BLKIO_THROTL_read_iops_device);
if (pn)
return pn->val.iops;
else
return -1;
iops = pn->val.iops;
spin_unlock_irqrestore(&blkcg->lock, flags);
return iops;
}
unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev)
{
struct blkio_policy_node *pn;
unsigned long flags;
unsigned int iops = -1;
spin_lock_irqsave(&blkcg->lock, flags);
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
BLKIO_THROTL_write_iops_device);
if (pn)
return pn->val.iops;
else
return -1;
iops = pn->val.iops;
spin_unlock_irqrestore(&blkcg->lock, flags);
return iops;
}
/* Checks whether user asked for deleting a policy rule */
@ -1085,6 +1101,7 @@ static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft,
if (blkio_delete_rule_command(newpn)) {
blkio_policy_delete_node(pn);
kfree(pn);
spin_unlock_irq(&blkcg->lock);
goto update_io_group;
}

2
block/blk-cgroup.h
View File

@ -188,7 +188,7 @@ struct blkio_policy_node {
union {
unsigned int weight;
/*
* Rate read/write in terms of byptes per second
* Rate read/write in terms of bytes per second
* Whether this rate represents read or write is determined
* by file type "fileid".
*/

471
block/blk-core.c
View File

@ -28,6 +28,7 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/fault-inject.h>
#include <linux/list_sort.h>
#include <linux/delay.h>
#define CREATE_TRACE_POINTS
#include <trace/events/block.h>
@ -38,8 +39,6 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);
EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap);
EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete);
static int __make_request(struct request_queue *q, struct bio *bio);
/*
* For the allocated request tables
*/
@ -347,30 +346,80 @@ void blk_put_queue(struct request_queue *q)
}
EXPORT_SYMBOL(blk_put_queue);
/*
* Note: If a driver supplied the queue lock, it is disconnected
* by this function. The actual state of the lock doesn't matter
* here as the request_queue isn't accessible after this point
* (QUEUE_FLAG_DEAD is set) and no other requests will be queued.
/**
* blk_drain_queue - drain requests from request_queue
* @q: queue to drain
* @drain_all: whether to drain all requests or only the ones w/ ELVPRIV
*
* Drain requests from @q. If @drain_all is set, all requests are drained.
* If not, only ELVPRIV requests are drained. The caller is responsible
* for ensuring that no new requests which need to be drained are queued.
*/
void blk_drain_queue(struct request_queue *q, bool drain_all)
{
while (true) {
int nr_rqs;
spin_lock_irq(q->queue_lock);
elv_drain_elevator(q);
if (drain_all)
blk_throtl_drain(q);
__blk_run_queue(q);
if (drain_all)
nr_rqs = q->rq.count[0] + q->rq.count[1];
else
nr_rqs = q->rq.elvpriv;
spin_unlock_irq(q->queue_lock);
if (!nr_rqs)
break;
msleep(10);
}
}
/**
* blk_cleanup_queue - shutdown a request queue
* @q: request queue to shutdown
*
* Mark @q DEAD, drain all pending requests, destroy and put it. All
* future requests will be failed immediately with -ENODEV.
*/
void blk_cleanup_queue(struct request_queue *q)
{
/*
* We know we have process context here, so we can be a little
* cautious and ensure that pending block actions on this device
* are done before moving on. Going into this function, we should
* not have processes doing IO to this device.
*/
blk_sync_queue(q);
spinlock_t *lock = q->queue_lock;
del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer);
/* mark @q DEAD, no new request or merges will be allowed afterwards */
mutex_lock(&q->sysfs_lock);
queue_flag_set_unlocked(QUEUE_FLAG_DEAD, q);
mutex_unlock(&q->sysfs_lock);
spin_lock_irq(lock);
queue_flag_set(QUEUE_FLAG_NOMERGES, q);
queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
queue_flag_set(QUEUE_FLAG_DEAD, q);
if (q->queue_lock != &q->__queue_lock)
q->queue_lock = &q->__queue_lock;
spin_unlock_irq(lock);
mutex_unlock(&q->sysfs_lock);
/*
* Drain all requests queued before DEAD marking. The caller might
* be trying to tear down @q before its elevator is initialized, in
* which case we don't want to call into draining.
*/
if (q->elevator)
blk_drain_queue(q, true);
/* @q won't process any more request, flush async actions */
del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer);
blk_sync_queue(q);
/* @q is and will stay empty, shutdown and put */
blk_put_queue(q);
}
EXPORT_SYMBOL(blk_cleanup_queue);
@ -541,7 +590,7 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn,
/*
* This also sets hw/phys segments, boundary and size
*/
blk_queue_make_request(q, __make_request);
blk_queue_make_request(q, blk_queue_bio);
q->sg_reserved_size = INT_MAX;
@ -576,7 +625,7 @@ static inline void blk_free_request(struct request_queue *q, struct request *rq)
}
static struct request *
blk_alloc_request(struct request_queue *q, int flags, int priv, gfp_t gfp_mask)
blk_alloc_request(struct request_queue *q, unsigned int flags, gfp_t gfp_mask)
{
struct request *rq = mempool_alloc(q->rq.rq_pool, gfp_mask);
@ -587,12 +636,10 @@ blk_alloc_request(struct request_queue *q, int flags, int priv, gfp_t gfp_mask)
rq->cmd_flags = flags | REQ_ALLOCED;
if (priv) {
if (unlikely(elv_set_request(q, rq, gfp_mask))) {
mempool_free(rq, q->rq.rq_pool);
return NULL;
}
rq->cmd_flags |= REQ_ELVPRIV;
if ((flags & REQ_ELVPRIV) &&
unlikely(elv_set_request(q, rq, gfp_mask))) {
mempool_free(rq, q->rq.rq_pool);
return NULL;
}
return rq;
@ -651,12 +698,13 @@ static void __freed_request(struct request_queue *q, int sync)
* A request has just been released. Account for it, update the full and
* congestion status, wake up any waiters. Called under q->queue_lock.
*/
static void freed_request(struct request_queue *q, int sync, int priv)
static void freed_request(struct request_queue *q, unsigned int flags)
{
struct request_list *rl = &q->rq;
int sync = rw_is_sync(flags);
rl->count[sync]--;
if (priv)
if (flags & REQ_ELVPRIV)
rl->elvpriv--;
__freed_request(q, sync);
@ -684,10 +732,19 @@ static bool blk_rq_should_init_elevator(struct bio *bio)
return true;
}
/*
* Get a free request, queue_lock must be held.
* Returns NULL on failure, with queue_lock held.
* Returns !NULL on success, with queue_lock *not held*.
/**
* get_request - get a free request
* @q: request_queue to allocate request from
* @rw_flags: RW and SYNC flags
* @bio: bio to allocate request for (can be %NULL)
* @gfp_mask: allocation mask
*
* Get a free request from @q. This function may fail under memory
* pressure or if @q is dead.
*
* Must be callled with @q->queue_lock held and,
* Returns %NULL on failure, with @q->queue_lock held.
* Returns !%NULL on success, with @q->queue_lock *not held*.
*/
static struct request *get_request(struct request_queue *q, int rw_flags,
struct bio *bio, gfp_t gfp_mask)
@ -696,7 +753,10 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
struct request_list *rl = &q->rq;
struct io_context *ioc = NULL;
const bool is_sync = rw_is_sync(rw_flags) != 0;
int may_queue, priv = 0;
int may_queue;
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
return NULL;
may_queue = elv_may_queue(q, rw_flags);
if (may_queue == ELV_MQUEUE_NO)
@ -740,17 +800,17 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
rl->count[is_sync]++;
rl->starved[is_sync] = 0;
if (blk_rq_should_init_elevator(bio)) {
priv = !test_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags);
if (priv)
rl->elvpriv++;
if (blk_rq_should_init_elevator(bio) &&
!test_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags)) {
rw_flags |= REQ_ELVPRIV;
rl->elvpriv++;
}
if (blk_queue_io_stat(q))
rw_flags |= REQ_IO_STAT;
spin_unlock_irq(q->queue_lock);
rq = blk_alloc_request(q, rw_flags, priv, gfp_mask);
rq = blk_alloc_request(q, rw_flags, gfp_mask);
if (unlikely(!rq)) {
/*
* Allocation failed presumably due to memory. Undo anything
@ -760,7 +820,7 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
* wait queue, but this is pretty rare.
*/
spin_lock_irq(q->queue_lock);
freed_request(q, is_sync, priv);
freed_request(q, rw_flags);
/*
* in the very unlikely event that allocation failed and no
@ -790,11 +850,18 @@ out:
return rq;
}
/*
* No available requests for this queue, wait for some requests to become
* available.
/**
* get_request_wait - get a free request with retry
* @q: request_queue to allocate request from
* @rw_flags: RW and SYNC flags
* @bio: bio to allocate request for (can be %NULL)
*
* Called with q->queue_lock held, and returns with it unlocked.
* Get a free request from @q. This function keeps retrying under memory
* pressure and fails iff @q is dead.
*
* Must be callled with @q->queue_lock held and,
* Returns %NULL on failure, with @q->queue_lock held.
* Returns !%NULL on success, with @q->queue_lock *not held*.
*/
static struct request *get_request_wait(struct request_queue *q, int rw_flags,
struct bio *bio)
@ -808,6 +875,9 @@ static struct request *get_request_wait(struct request_queue *q, int rw_flags,
struct io_context *ioc;
struct request_list *rl = &q->rq;
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
return NULL;
prepare_to_wait_exclusive(&rl->wait[is_sync], &wait,
TASK_UNINTERRUPTIBLE);
@ -838,19 +908,15 @@ struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask)
{
struct request *rq;
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
return NULL;
BUG_ON(rw != READ && rw != WRITE);
spin_lock_irq(q->queue_lock);
if (gfp_mask & __GFP_WAIT) {
if (gfp_mask & __GFP_WAIT)
rq = get_request_wait(q, rw, NULL);
} else {
else
rq = get_request(q, rw, NULL, gfp_mask);
if (!rq)
spin_unlock_irq(q->queue_lock);
}
if (!rq)
spin_unlock_irq(q->queue_lock);
/* q->queue_lock is unlocked at this point */
return rq;
@ -1052,14 +1118,13 @@ void __blk_put_request(struct request_queue *q, struct request *req)
* it didn't come out of our reserved rq pools
*/
if (req->cmd_flags & REQ_ALLOCED) {
int is_sync = rq_is_sync(req) != 0;
int priv = req->cmd_flags & REQ_ELVPRIV;
unsigned int flags = req->cmd_flags;
BUG_ON(!list_empty(&req->queuelist));
BUG_ON(!hlist_unhashed(&req->hash));
blk_free_request(q, req);
freed_request(q, is_sync, priv);
freed_request(q, flags);
}
}
EXPORT_SYMBOL_GPL(__blk_put_request);
@ -1161,18 +1226,32 @@ static bool bio_attempt_front_merge(struct request_queue *q,
return true;
}
/*
* Attempts to merge with the plugged list in the current process. Returns
* true if merge was successful, otherwise false.
/**
* attempt_plug_merge - try to merge with %current's plugged list
* @q: request_queue new bio is being queued at
* @bio: new bio being queued
* @request_count: out parameter for number of traversed plugged requests
*
* Determine whether @bio being queued on @q can be merged with a request
* on %current's plugged list. Returns %true if merge was successful,
* otherwise %false.
*
* This function is called without @q->queue_lock; however, elevator is
* accessed iff there already are requests on the plugged list which in
* turn guarantees validity of the elevator.
*
* Note that, on successful merge, elevator operation
* elevator_bio_merged_fn() will be called without queue lock. Elevator
* must be ready for this.
*/
static bool attempt_plug_merge(struct task_struct *tsk, struct request_queue *q,
struct bio *bio, unsigned int *request_count)
static bool attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int *request_count)
{
struct blk_plug *plug;
struct request *rq;
bool ret = false;
plug = tsk->plug;
plug = current->plug;
if (!plug)
goto out;
*request_count = 0;
@ -1202,7 +1281,6 @@ out:
void init_request_from_bio(struct request *req, struct bio *bio)
{
req->cpu = bio->bi_comp_cpu;
req->cmd_type = REQ_TYPE_FS;
req->cmd_flags |= bio->bi_rw & REQ_COMMON_MASK;
@ -1215,7 +1293,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
blk_rq_bio_prep(req->q, req, bio);
}
static int __make_request(struct request_queue *q, struct bio *bio)
void blk_queue_bio(struct request_queue *q, struct bio *bio)
{
const bool sync = !!(bio->bi_rw & REQ_SYNC);
struct blk_plug *plug;
@ -1240,8 +1318,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
* Check if we can merge with the plugged list before grabbing
* any locks.
*/
if (attempt_plug_merge(current, q, bio, &request_count))
goto out;
if (attempt_plug_merge(q, bio, &request_count))
return;
spin_lock_irq(q->queue_lock);
@ -1275,6 +1353,10 @@ get_rq:
* Returns with the queue unlocked.
*/
req = get_request_wait(q, rw_flags, bio);
if (unlikely(!req)) {
bio_endio(bio, -ENODEV); /* @q is dead */
goto out_unlock;
}
/*
* After dropping the lock and possibly sleeping here, our request
@ -1284,8 +1366,7 @@ get_rq:
*/
init_request_from_bio(req, bio);
if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) ||
bio_flagged(bio, BIO_CPU_AFFINE))
if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags))
req->cpu = raw_smp_processor_id();
plug = current->plug;
@ -1316,9 +1397,8 @@ get_rq:
out_unlock:
spin_unlock_irq(q->queue_lock);
}
out:
return 0;
}
EXPORT_SYMBOL_GPL(blk_queue_bio); /* for device mapper only */
/*
* If bio->bi_dev is a partition, remap the location
@ -1417,6 +1497,89 @@ static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors)
return 0;
}
static noinline_for_stack bool
generic_make_request_checks(struct bio *bio)
{
struct request_queue *q;
int nr_sectors = bio_sectors(bio);
int err = -EIO;
char b[BDEVNAME_SIZE];
struct hd_struct *part;
might_sleep();
if (bio_check_eod(bio, nr_sectors))
goto end_io;
q = bdev_get_queue(bio->bi_bdev);
if (unlikely(!q)) {
printk(KERN_ERR
"generic_make_request: Trying to access "
"nonexistent block-device %s (%Lu)\n",
bdevname(bio->bi_bdev, b),
(long long) bio->bi_sector);
goto end_io;
}
if (unlikely(!(bio->bi_rw & REQ_DISCARD) &&
nr_sectors > queue_max_hw_sectors(q))) {
printk(KERN_ERR "bio too big device %s (%u > %u)\n",
bdevname(bio->bi_bdev, b),
bio_sectors(bio),
queue_max_hw_sectors(q));
goto end_io;
}
part = bio->bi_bdev->bd_part;
if (should_fail_request(part, bio->bi_size) ||
should_fail_request(&part_to_disk(part)->part0,
bio->bi_size))
goto end_io;
/*
* If this device has partitions, remap block n
* of partition p to block n+start(p) of the disk.
*/
blk_partition_remap(bio);
if (bio_integrity_enabled(bio) && bio_integrity_prep(bio))
goto end_io;
if (bio_check_eod(bio, nr_sectors))
goto end_io;
/*
* Filter flush bio's early so that make_request based
* drivers without flush support don't have to worry
* about them.
*/
if ((bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && !q->flush_flags) {
bio->bi_rw &= ~(REQ_FLUSH | REQ_FUA);
if (!nr_sectors) {
err = 0;
goto end_io;
}
}
if ((bio->bi_rw & REQ_DISCARD) &&
(!blk_queue_discard(q) ||
((bio->bi_rw & REQ_SECURE) &&
!blk_queue_secdiscard(q)))) {
err = -EOPNOTSUPP;
goto end_io;
}
if (blk_throtl_bio(q, bio))
return false; /* throttled, will be resubmitted later */
trace_block_bio_queue(q, bio);
return true;
end_io:
bio_endio(bio, err);
return false;
}
/**
* generic_make_request - hand a buffer to its device driver for I/O
* @bio: The bio describing the location in memory and on the device.
@ -1437,145 +1600,32 @@ static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors)
* completion notification should be signaled.
*
* generic_make_request and the drivers it calls may use bi_next if this
* bio happens to be merged with someone else, and may change bi_dev and
* bi_sector for remaps as it sees fit. So the values of these fields
* should NOT be depended on after the call to generic_make_request.
*/
static inline void __generic_make_request(struct bio *bio)
{
struct request_queue *q;
sector_t old_sector;
int ret, nr_sectors = bio_sectors(bio);
dev_t old_dev;
int err = -EIO;
might_sleep();
if (bio_check_eod(bio, nr_sectors))
goto end_io;
/*
* Resolve the mapping until finished. (drivers are
* still free to implement/resolve their own stacking
* by explicitly returning 0)
*
* NOTE: we don't repeat the blk_size check for each new device.
* Stacking drivers are expected to know what they are doing.
*/
old_sector = -1;
old_dev = 0;
do {
char b[BDEVNAME_SIZE];
struct hd_struct *part;
q = bdev_get_queue(bio->bi_bdev);
if (unlikely(!q)) {
printk(KERN_ERR
"generic_make_request: Trying to access "
"nonexistent block-device %s (%Lu)\n",
bdevname(bio->bi_bdev, b),
(long long) bio->bi_sector);
goto end_io;
}
if (unlikely(!(bio->bi_rw & REQ_DISCARD) &&
nr_sectors > queue_max_hw_sectors(q))) {
printk(KERN_ERR "bio too big device %s (%u > %u)\n",
bdevname(bio->bi_bdev, b),
bio_sectors(bio),
queue_max_hw_sectors(q));
goto end_io;
}
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
goto end_io;
part = bio->bi_bdev->bd_part;
if (should_fail_request(part, bio->bi_size) ||
should_fail_request(&part_to_disk(part)->part0,
bio->bi_size))
goto end_io;
/*
* If this device has partitions, remap block n
* of partition p to block n+start(p) of the disk.
*/
blk_partition_remap(bio);
if (bio_integrity_enabled(bio) && bio_integrity_prep(bio))
goto end_io;
if (old_sector != -1)
trace_block_bio_remap(q, bio, old_dev, old_sector);
old_sector = bio->bi_sector;
old_dev = bio->bi_bdev->bd_dev;
if (bio_check_eod(bio, nr_sectors))
goto end_io;
/*
* Filter flush bio's early so that make_request based
* drivers without flush support don't have to worry
* about them.
*/
if ((bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && !q->flush_flags) {
bio->bi_rw &= ~(REQ_FLUSH | REQ_FUA);
if (!nr_sectors) {
err = 0;
goto end_io;
}
}
if ((bio->bi_rw & REQ_DISCARD) &&
(!blk_queue_discard(q) ||
((bio->bi_rw & REQ_SECURE) &&
!blk_queue_secdiscard(q)))) {
err = -EOPNOTSUPP;
goto end_io;
}
if (blk_throtl_bio(q, &bio))
goto end_io;
/*
* If bio = NULL, bio has been throttled and will be submitted
* later.
*/
if (!bio)
break;
trace_block_bio_queue(q, bio);
ret = q->make_request_fn(q, bio);
} while (ret);
return;
end_io:
bio_endio(bio, err);
}
/*
* We only want one ->make_request_fn to be active at a time,
* else stack usage with stacked devices could be a problem.
* So use current->bio_list to keep a list of requests
* submited by a make_request_fn function.
* current->bio_list is also used as a flag to say if
* generic_make_request is currently active in this task or not.
* If it is NULL, then no make_request is active. If it is non-NULL,
* then a make_request is active, and new requests should be added
* at the tail
* bio happens to be merged with someone else, and may resubmit the bio to
* a lower device by calling into generic_make_request recursively, which
* means the bio should NOT be touched after the call to ->make_request_fn.
*/
void generic_make_request(struct bio *bio)
{
struct bio_list bio_list_on_stack;
if (!generic_make_request_checks(bio))
return;
/*
* We only want one ->make_request_fn to be active at a time, else
* stack usage with stacked devices could be a problem. So use
* current->bio_list to keep a list of requests submited by a
* make_request_fn function. current->bio_list is also used as a
* flag to say if generic_make_request is currently active in this
* task or not. If it is NULL, then no make_request is active. If
* it is non-NULL, then a make_request is active, and new requests
* should be added at the tail
*/
if (current->bio_list) {
/* make_request is active */
bio_list_add(current->bio_list, bio);
return;
}
/* following loop may be a bit non-obvious, and so deserves some
* explanation.
* Before entering the loop, bio->bi_next is NULL (as all callers
@ -1583,22 +1633,21 @@ void generic_make_request(struct bio *bio)
* We pretend that we have just taken it off a longer list, so
* we assign bio_list to a pointer to the bio_list_on_stack,
* thus initialising the bio_list of new bios to be
* added. __generic_make_request may indeed add some more bios
* added. ->make_request() may indeed add some more bios
* through a recursive call to generic_make_request. If it
* did, we find a non-NULL value in bio_list and re-enter the loop
* from the top. In this case we really did just take the bio
* of the top of the list (no pretending) and so remove it from
* bio_list, and call into __generic_make_request again.
*
* The loop was structured like this to make only one call to
* __generic_make_request (which is important as it is large and
* inlined) and to keep the structure simple.
* bio_list, and call into ->make_request() again.
*/
BUG_ON(bio->bi_next);
bio_list_init(&bio_list_on_stack);
current->bio_list = &bio_list_on_stack;
do {
__generic_make_request(bio);
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
q->make_request_fn(q, bio);
bio = bio_list_pop(current->bio_list);
} while (bio);
current->bio_list = NULL; /* deactivate */
@ -1725,6 +1774,8 @@ int blk_insert_cloned_request(struct request_queue *q, struct request *rq)
where = ELEVATOR_INSERT_FLUSH;
add_acct_request(q, rq, where);
if (where == ELEVATOR_INSERT_FLUSH)
__blk_run_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
return 0;
@ -2628,6 +2679,20 @@ EXPORT_SYMBOL(kblockd_schedule_delayed_work);
#define PLUG_MAGIC 0x91827364
/**
* blk_start_plug - initialize blk_plug and track it inside the task_struct
* @plug: The &struct blk_plug that needs to be initialized
*
* Description:
* Tracking blk_plug inside the task_struct will help with auto-flushing the
* pending I/O should the task end up blocking between blk_start_plug() and
* blk_finish_plug(). This is important from a performance perspective, but
* also ensures that we don't deadlock. For instance, if the task is blocking
* for a memory allocation, memory reclaim could end up wanting to free a
* page belonging to that request that is currently residing in our private
* plug. By flushing the pending I/O when the process goes to sleep, we avoid
* this kind of deadlock.
*/
void blk_start_plug(struct blk_plug *plug)
{
struct task_struct *tsk = current;

3
block/blk-flush.c
View File

@ -320,7 +320,7 @@ void blk_insert_flush(struct request *rq)
return;
}
BUG_ON(!rq->bio || rq->bio != rq->biotail);
BUG_ON(rq->bio != rq->biotail); /*assumes zero or single bio rq */
/*
* If there's data but flush is not necessary, the request can be
@ -330,7 +330,6 @@ void blk_insert_flush(struct request *rq)
if ((policy & REQ_FSEQ_DATA) &&
!(policy & (REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH))) {
list_add_tail(&rq->queuelist, &q->queue_head);
blk_run_queue_async(q);
return;
}

7
block/blk-sysfs.c
View File

@ -457,11 +457,11 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr,
}
/**
* blk_cleanup_queue: - release a &struct request_queue when it is no longer needed
* @kobj: the kobj belonging of the request queue to be released
* blk_release_queue: - release a &struct request_queue when it is no longer needed
* @kobj: the kobj belonging to the request queue to be released
*
* Description:
* blk_cleanup_queue is the pair to blk_init_queue() or
* blk_release_queue is the pair to blk_init_queue() or
* blk_queue_make_request(). It should be called when a request queue is
* being released; typically when a block device is being de-registered.
* Currently, its primary task it to free all the &struct request
@ -490,6 +490,7 @@ static void blk_release_queue(struct kobject *kobj)
if (q->queue_tags)
__blk_queue_free_tags(q);
blk_throtl_release(q);
blk_trace_shutdown(q);
bdi_destroy(&q->backing_dev_info);

6
block/blk-tag.c
View File

@ -286,12 +286,14 @@ void blk_queue_end_tag(struct request_queue *q, struct request *rq)
BUG_ON(tag == -1);
if (unlikely(tag >= bqt->real_max_depth))
if (unlikely(tag >= bqt->max_depth)) {
/*
* This can happen after tag depth has been reduced.
* FIXME: how about a warning or info message here?
* But tag shouldn't be larger than real_max_depth.
*/
WARN_ON(tag >= bqt->real_max_depth);
return;
}
list_del_init(&rq->queuelist);
rq->cmd_flags &= ~REQ_QUEUED;

108
block/blk-throttle.c
View File

@ -10,6 +10,7 @@
#include <linux/bio.h>
#include <linux/blktrace_api.h>
#include "blk-cgroup.h"
#include "blk.h"
/* Max dispatch from a group in 1 round */
static int throtl_grp_quantum = 8;
@ -302,16 +303,16 @@ throtl_grp *throtl_find_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
return tg;
}
/*
* This function returns with queue lock unlocked in case of error, like
* request queue is no more
*/
static struct throtl_grp * throtl_get_tg(struct throtl_data *td)
{
struct throtl_grp *tg = NULL, *__tg = NULL;
struct blkio_cgroup *blkcg;
struct request_queue *q = td->queue;
/* no throttling for dead queue */
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
return NULL;
rcu_read_lock();
blkcg = task_blkio_cgroup(current);
tg = throtl_find_tg(td, blkcg);
@ -323,32 +324,22 @@ static struct throtl_grp * throtl_get_tg(struct throtl_data *td)
/*
* Need to allocate a group. Allocation of group also needs allocation
* of per cpu stats which in-turn takes a mutex() and can block. Hence
* we need to drop rcu lock and queue_lock before we call alloc
*
* Take the request queue reference to make sure queue does not
* go away once we return from allocation.
* we need to drop rcu lock and queue_lock before we call alloc.
*/
blk_get_queue(q);
rcu_read_unlock();
spin_unlock_irq(q->queue_lock);
tg = throtl_alloc_tg(td);
/*
* We might have slept in group allocation. Make sure queue is not
* dead
*/
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
blk_put_queue(q);
if (tg)
kfree(tg);
return ERR_PTR(-ENODEV);
}
blk_put_queue(q);
/* Group allocated and queue is still alive. take the lock */
spin_lock_irq(q->queue_lock);
/* Make sure @q is still alive */
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
kfree(tg);
return NULL;
}
/*
* Initialize the new group. After sleeping, read the blkcg again.
*/
@ -1014,11 +1005,6 @@ static void throtl_release_tgs(struct throtl_data *td)
}
}
static void throtl_td_free(struct throtl_data *td)
{
kfree(td);
}
/*
* Blk cgroup controller notification saying that blkio_group object is being
* delinked as associated cgroup object is going away. That also means that
@ -1123,17 +1109,17 @@ static struct blkio_policy_type blkio_policy_throtl = {
.plid = BLKIO_POLICY_THROTL,
};
int blk_throtl_bio(struct request_queue *q, struct bio **biop)
bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
{
struct throtl_data *td = q->td;
struct throtl_grp *tg;
struct bio *bio = *biop;
bool rw = bio_data_dir(bio), update_disptime = true;
struct blkio_cgroup *blkcg;
bool throttled = false;
if (bio->bi_rw & REQ_THROTTLED) {
bio->bi_rw &= ~REQ_THROTTLED;
return 0;
goto out;
}
/*
@ -1152,7 +1138,7 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
blkiocg_update_dispatch_stats(&tg->blkg, bio->bi_size,
rw, rw_is_sync(bio->bi_rw));
rcu_read_unlock();
return 0;
goto out;
}
}
rcu_read_unlock();
@ -1161,18 +1147,10 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
* Either group has not been allocated yet or it is not an unlimited
* IO group
*/
spin_lock_irq(q->queue_lock);
tg = throtl_get_tg(td);
if (IS_ERR(tg)) {
if (PTR_ERR(tg) == -ENODEV) {
/*
* Queue is gone. No queue lock held here.
*/
return -ENODEV;
}
}
if (unlikely(!tg))
goto out_unlock;
if (tg->nr_queued[rw]) {
/*
@ -1200,7 +1178,7 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
* So keep on trimming slice even if bio is not queued.
*/
throtl_trim_slice(td, tg, rw);
goto out;
goto out_unlock;
}
queue_bio:
@ -1212,16 +1190,52 @@ queue_bio:
tg->nr_queued[READ], tg->nr_queued[WRITE]);
throtl_add_bio_tg(q->td, tg, bio);
*biop = NULL;
throttled = true;
if (update_disptime) {
tg_update_disptime(td, tg);
throtl_schedule_next_dispatch(td);
}
out:
out_unlock:
spin_unlock_irq(q->queue_lock);
return 0;
out:
return throttled;
}
/**
* blk_throtl_drain - drain throttled bios
* @q: request_queue to drain throttled bios for
*
* Dispatch all currently throttled bios on @q through ->make_request_fn().
*/
void blk_throtl_drain(struct request_queue *q)
__releases(q->queue_lock) __acquires(q->queue_lock)
{
struct throtl_data *td = q->td;
struct throtl_rb_root *st = &td->tg_service_tree;
struct throtl_grp *tg;
struct bio_list bl;
struct bio *bio;
WARN_ON_ONCE(!queue_is_locked(q));
bio_list_init(&bl);
while ((tg = throtl_rb_first(st))) {
throtl_dequeue_tg(td, tg);
while ((bio = bio_list_peek(&tg->bio_lists[READ])))
tg_dispatch_one_bio(td, tg, bio_data_dir(bio), &bl);
while ((bio = bio_list_peek(&tg->bio_lists[WRITE])))
tg_dispatch_one_bio(td, tg, bio_data_dir(bio), &bl);
}
spin_unlock_irq(q->queue_lock);
while ((bio = bio_list_pop(&bl)))
generic_make_request(bio);
spin_lock_irq(q->queue_lock);
}
int blk_throtl_init(struct request_queue *q)
@ -1296,7 +1310,11 @@ void blk_throtl_exit(struct request_queue *q)
* it.
*/
throtl_shutdown_wq(q);
throtl_td_free(td);
}
void blk_throtl_release(struct request_queue *q)
{
kfree(q->td);
}
static int __init throtl_init(void)

20
block/blk.h
View File

@ -15,6 +15,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio);
int blk_rq_append_bio(struct request_queue *q, struct request *rq,
struct bio *bio);
void blk_drain_queue(struct request_queue *q, bool drain_all);
void blk_dequeue_request(struct request *rq);
void __blk_queue_free_tags(struct request_queue *q);
bool __blk_end_bidi_request(struct request *rq, int error,
@ -188,4 +189,21 @@ static inline int blk_do_io_stat(struct request *rq)
(rq->cmd_flags & REQ_DISCARD));
}
#endif
#ifdef CONFIG_BLK_DEV_THROTTLING
extern bool blk_throtl_bio(struct request_queue *q, struct bio *bio);
extern void blk_throtl_drain(struct request_queue *q);
extern int blk_throtl_init(struct request_queue *q);
extern void blk_throtl_exit(struct request_queue *q);
extern void blk_throtl_release(struct request_queue *q);
#else /* CONFIG_BLK_DEV_THROTTLING */
static inline bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
{
return false;
}
static inline void blk_throtl_drain(struct request_queue *q) { }
static inline int blk_throtl_init(struct request_queue *q) { return 0; }
static inline void blk_throtl_exit(struct request_queue *q) { }
static inline void blk_throtl_release(struct request_queue *q) { }
#endif /* CONFIG_BLK_DEV_THROTTLING */
#endif /* BLK_INTERNAL_H */

39
block/elevator.c
View File

@ -31,7 +31,6 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/blktrace_api.h>
#include <linux/hash.h>
#include <linux/uaccess.h>
@ -182,7 +181,7 @@ static void elevator_attach(struct request_queue *q, struct elevator_queue *eq,
eq->elevator_data = data;
}
static char chosen_elevator[16];
static char chosen_elevator[ELV_NAME_MAX];
static int __init elevator_setup(char *str)
{
@ -606,43 +605,35 @@ void elv_requeue_request(struct request_queue *q, struct request *rq)
void elv_drain_elevator(struct request_queue *q)
{
static int printed;
lockdep_assert_held(q->queue_lock);
while (q->elevator->ops->elevator_dispatch_fn(q, 1))
;
if (q->nr_sorted == 0)
return;
if (printed++ < 10) {
if (q->nr_sorted && printed++ < 10) {
printk(KERN_ERR "%s: forced dispatching is broken "
"(nr_sorted=%u), please report this\n",
q->elevator->elevator_type->elevator_name, q->nr_sorted);
}
}
/*
* Call with queue lock held, interrupts disabled
*/
void elv_quiesce_start(struct request_queue *q)
{
if (!q->elevator)
return;
spin_lock_irq(q->queue_lock);
queue_flag_set(QUEUE_FLAG_ELVSWITCH, q);
spin_unlock_irq(q->queue_lock);
/*
* make sure we don't have any requests in flight
*/
elv_drain_elevator(q);
while (q->rq.elvpriv) {
__blk_run_queue(q);
spin_unlock_irq(q->queue_lock);
msleep(10);
spin_lock_irq(q->queue_lock);
elv_drain_elevator(q);
}
blk_drain_queue(q, false);
}
void elv_quiesce_end(struct request_queue *q)
{
spin_lock_irq(q->queue_lock);
queue_flag_clear(QUEUE_FLAG_ELVSWITCH, q);
spin_unlock_irq(q->queue_lock);
}
void __elv_add_request(struct request_queue *q, struct request *rq, int where)
@ -972,7 +963,6 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
/*
* Turn on BYPASS and drain all requests w/ elevator private data
*/
spin_lock_irq(q->queue_lock);
elv_quiesce_start(q);
/*
@ -983,8 +973,8 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
/*
* attach and start new elevator
*/
spin_lock_irq(q->queue_lock);
elevator_attach(q, e, data);
spin_unlock_irq(q->queue_lock);
if (old_elevator->registered) {
@ -999,9 +989,7 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
* finally exit old elevator and turn off BYPASS.
*/
elevator_exit(old_elevator);
spin_lock_irq(q->queue_lock);
elv_quiesce_end(q);
spin_unlock_irq(q->queue_lock);
blk_add_trace_msg(q, "elv switch: %s", e->elevator_type->elevator_name);
@ -1015,10 +1003,7 @@ fail_register:
elevator_exit(e);
q->elevator = old_elevator;
elv_register_queue(q);
spin_lock_irq(q->queue_lock);
queue_flag_clear(QUEUE_FLAG_ELVSWITCH, q);
spin_unlock_irq(q->queue_lock);
elv_quiesce_end(q);
return err;
}

8
block/genhd.c
View File

@ -612,6 +612,12 @@ void add_disk(struct gendisk *disk)
register_disk(disk);
blk_register_queue(disk);
/*
* Take an extra ref on queue which will be put on disk_release()
* so that it sticks around as long as @disk is there.
*/
WARN_ON_ONCE(blk_get_queue(disk->queue));
retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
"bdi");
WARN_ON(retval);
@ -1166,6 +1172,8 @@ static void disk_release(struct device *dev)
disk_replace_part_tbl(disk, NULL);
free_part_stats(&disk->part0);
free_part_info(&disk->part0);
if (disk->queue)
blk_put_queue(disk->queue);
kfree(disk);
}
struct class block_class = {

3
block/scsi_ioctl.c
View File

@ -565,7 +565,7 @@ int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mod
{
int err;
if (!q || blk_get_queue(q))
if (!q)
return -ENXIO;
switch (cmd) {
@ -686,7 +686,6 @@ int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mod
err = -ENOTTY;
}
blk_put_queue(q);
return err;
}
EXPORT_SYMBOL(scsi_cmd_ioctl);

14
drivers/block/aoe/aoeblk.c
View File

@ -159,7 +159,7 @@ aoeblk_release(struct gendisk *disk, fmode_t mode)
return 0;
}
static int
static void
aoeblk_make_request(struct request_queue *q, struct bio *bio)
{
struct sk_buff_head queue;
@ -172,25 +172,25 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
if (bio == NULL) {
printk(KERN_ERR "aoe: bio is NULL\n");
BUG();
return 0;
return;
}
d = bio->bi_bdev->bd_disk->private_data;
if (d == NULL) {
printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
BUG();
bio_endio(bio, -ENXIO);
return 0;
return;
} else if (bio->bi_io_vec == NULL) {
printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
BUG();
bio_endio(bio, -ENXIO);
return 0;
return;
}
buf = mempool_alloc(d->bufpool, GFP_NOIO);
if (buf == NULL) {
printk(KERN_INFO "aoe: buf allocation failure\n");
bio_endio(bio, -ENOMEM);
return 0;
return;
}
memset(buf, 0, sizeof(*buf));
INIT_LIST_HEAD(&buf->bufs);
@ -211,7 +211,7 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
spin_unlock_irqrestore(&d->lock, flags);
mempool_free(buf, d->bufpool);
bio_endio(bio, -ENXIO);
return 0;
return;
}
list_add_tail(&buf->bufs, &d->bufq);
@ -222,8 +222,6 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(&queue);
return 0;
}
static int

4
drivers/block/brd.c
View File

@ -323,7 +323,7 @@ out:
return err;
}
static int brd_make_request(struct request_queue *q, struct bio *bio)
static void brd_make_request(struct request_queue *q, struct bio *bio)
{
struct block_device *bdev = bio->bi_bdev;
struct brd_device *brd = bdev->bd_disk->private_data;
@ -359,8 +359,6 @@ static int brd_make_request(struct request_queue *q, struct bio *bio)
out:
bio_endio(bio, err);
return 0;
}
#ifdef CONFIG_BLK_DEV_XIP

2
drivers/block/drbd/drbd_int.h
View File

@ -1506,7 +1506,7 @@ extern void drbd_free_mdev(struct drbd_conf *mdev);
extern int proc_details;
/* drbd_req */
extern int drbd_make_request(struct request_queue *q, struct bio *bio);
extern void drbd_make_request(struct request_queue *q, struct bio *bio);
extern int drbd_read_remote(struct drbd_conf *mdev, struct drbd_request *req);
extern int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *bvec);
extern int is_valid_ar_handle(struct drbd_request *, sector_t);

8
drivers/block/drbd/drbd_req.c
View File

@ -1073,7 +1073,7 @@ static int drbd_fail_request_early(struct drbd_conf *mdev, int is_write)
return 0;
}
int drbd_make_request(struct request_queue *q, struct bio *bio)
void drbd_make_request(struct request_queue *q, struct bio *bio)
{
unsigned int s_enr, e_enr;
struct drbd_conf *mdev = (struct drbd_conf *) q->queuedata;
@ -1081,7 +1081,7 @@ int drbd_make_request(struct request_queue *q, struct bio *bio)
if (drbd_fail_request_early(mdev, bio_data_dir(bio) & WRITE)) {
bio_endio(bio, -EPERM);
return 0;
return;
}
start_time = jiffies;
@ -1100,7 +1100,8 @@ int drbd_make_request(struct request_queue *q, struct bio *bio)
if (likely(s_enr == e_enr)) {
inc_ap_bio(mdev, 1);
return drbd_make_request_common(mdev, bio, start_time);
drbd_make_request_common(mdev, bio, start_time);
return;
}
/* can this bio be split generically?
@ -1148,7 +1149,6 @@ int drbd_make_request(struct request_queue *q, struct bio *bio)
bio_pair_release(bp);
}
return 0;
}
/* This is called by bio_add_page(). With this function we reduce

146
drivers/block/loop.c
View File

@ -202,74 +202,6 @@ lo_do_transfer(struct loop_device *lo, int cmd,
return lo->transfer(lo, cmd, rpage, roffs, lpage, loffs, size, rblock);
}
/**
* do_lo_send_aops - helper for writing data to a loop device
*
* This is the fast version for backing filesystems which implement the address
* space operations write_begin and write_end.
*/
static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
loff_t pos, struct page *unused)
{
struct file *file = lo->lo_backing_file; /* kudos to NFsckingS */
struct address_space *mapping = file->f_mapping;
pgoff_t index;
unsigned offset, bv_offs;
int len, ret;
mutex_lock(&mapping->host->i_mutex);
index = pos >> PAGE_CACHE_SHIFT;
offset = pos & ((pgoff_t)PAGE_CACHE_SIZE - 1);
bv_offs = bvec->bv_offset;
len = bvec->bv_len;
while (len > 0) {
sector_t IV;
unsigned size, copied;
int transfer_result;
struct page *page;
void *fsdata;
IV = ((sector_t)index << (PAGE_CACHE_SHIFT - 9))+(offset >> 9);
size = PAGE_CACHE_SIZE - offset;
if (size > len)
size = len;
ret = pagecache_write_begin(file, mapping, pos, size, 0,
&page, &fsdata);
if (ret)
goto fail;
file_update_time(file);
transfer_result = lo_do_transfer(lo, WRITE, page, offset,
bvec->bv_page, bv_offs, size, IV);
copied = size;
if (unlikely(transfer_result))
copied = 0;
ret = pagecache_write_end(file, mapping, pos, size, copied,
page, fsdata);
if (ret < 0 || ret != copied)
goto fail;
if (unlikely(transfer_result))
goto fail;
bv_offs += copied;
len -= copied;
offset = 0;
index++;
pos += copied;
}
ret = 0;
out:
mutex_unlock(&mapping->host->i_mutex);
return ret;
fail:
ret = -1;
goto out;
}
/**
* __do_lo_send_write - helper for writing data to a loop device
*
@ -297,10 +229,8 @@ static int __do_lo_send_write(struct file *file,
/**
* do_lo_send_direct_write - helper for writing data to a loop device
*
* This is the fast, non-transforming version for backing filesystems which do
* not implement the address space operations write_begin and write_end.
* It uses the write file operation which should be present on all writeable
* filesystems.
* This is the fast, non-transforming version that does not need double
* buffering.
*/
static int do_lo_send_direct_write(struct loop_device *lo,
struct bio_vec *bvec, loff_t pos, struct page *page)
@ -316,15 +246,9 @@ static int do_lo_send_direct_write(struct loop_device *lo,
/**
* do_lo_send_write - helper for writing data to a loop device
*
* This is the slow, transforming version for filesystems which do not
* implement the address space operations write_begin and write_end. It
* uses the write file operation which should be present on all writeable
* filesystems.
*
* Using fops->write is slower than using aops->{prepare,commit}_write in the
* transforming case because we need to double buffer the data as we cannot do
* the transformations in place as we do not have direct access to the
* destination pages of the backing file.
* This is the slow, transforming version that needs to double buffer the
* data as it cannot do the transformations in place without having direct
* access to the destination pages of the backing file.
*/
static int do_lo_send_write(struct loop_device *lo, struct bio_vec *bvec,
loff_t pos, struct page *page)
@ -350,17 +274,16 @@ static int lo_send(struct loop_device *lo, struct bio *bio, loff_t pos)
struct page *page = NULL;
int i, ret = 0;
do_lo_send = do_lo_send_aops;
if (!(lo->lo_flags & LO_FLAGS_USE_AOPS)) {
if (lo->transfer != transfer_none) {
page = alloc_page(GFP_NOIO | __GFP_HIGHMEM);
if (unlikely(!page))
goto fail;
kmap(page);
do_lo_send = do_lo_send_write;
} else {
do_lo_send = do_lo_send_direct_write;
if (lo->transfer != transfer_none) {
page = alloc_page(GFP_NOIO | __GFP_HIGHMEM);
if (unlikely(!page))
goto fail;
kmap(page);
do_lo_send = do_lo_send_write;
}
}
bio_for_each_segment(bvec, bio, i) {
ret = do_lo_send(lo, bvec, pos, page);
if (ret < 0)
@ -514,7 +437,7 @@ static struct bio *loop_get_bio(struct loop_device *lo)
return bio_list_pop(&lo->lo_bio_list);
}
static int loop_make_request(struct request_queue *q, struct bio *old_bio)
static void loop_make_request(struct request_queue *q, struct bio *old_bio)
{
struct loop_device *lo = q->queuedata;
int rw = bio_rw(old_bio);
@ -532,12 +455,11 @@ static int loop_make_request(struct request_queue *q, struct bio *old_bio)
loop_add_bio(lo, old_bio);
wake_up(&lo->lo_event);
spin_unlock_irq(&lo->lo_lock);
return 0;
return;
out:
spin_unlock_irq(&lo->lo_lock);
bio_io_error(old_bio);
return 0;
}
struct switch_request {
@ -849,36 +771,24 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
mapping = file->f_mapping;
inode = mapping->host;
if (!(file->f_mode & FMODE_WRITE))
lo_flags |= LO_FLAGS_READ_ONLY;
error = -EINVAL;
if (S_ISREG(inode->i_mode) || S_ISBLK(inode->i_mode)) {
const struct address_space_operations *aops = mapping->a_ops;
if (aops->write_begin)
lo_flags |= LO_FLAGS_USE_AOPS;
if (!(lo_flags & LO_FLAGS_USE_AOPS) && !file->f_op->write)
lo_flags |= LO_FLAGS_READ_ONLY;
lo_blocksize = S_ISBLK(inode->i_mode) ?
inode->i_bdev->bd_block_size : PAGE_SIZE;
error = 0;
} else {
if (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))
goto out_putf;
}
size = get_loop_size(lo, file);
if ((loff_t)(sector_t)size != size) {
error = -EFBIG;
goto out_putf;
}
if (!(mode & FMODE_WRITE))
if (!(file->f_mode & FMODE_WRITE) || !(mode & FMODE_WRITE) ||
!file->f_op->write)
lo_flags |= LO_FLAGS_READ_ONLY;
lo_blocksize = S_ISBLK(inode->i_mode) ?
inode->i_bdev->bd_block_size : PAGE_SIZE;
error = -EFBIG;
size = get_loop_size(lo, file);
if ((loff_t)(sector_t)size != size)
goto out_putf;
error = 0;
set_device_ro(bdev, (lo_flags & LO_FLAGS_READ_ONLY) != 0);
lo->lo_blocksize = lo_blocksize;

11
drivers/block/pktcdvd.c
View File

@ -2444,7 +2444,7 @@ static void pkt_end_io_read_cloned(struct bio *bio, int err)
pkt_bio_finished(pd);
}
static int pkt_make_request(struct request_queue *q, struct bio *bio)
static void pkt_make_request(struct request_queue *q, struct bio *bio)
{
struct pktcdvd_device *pd;
char b[BDEVNAME_SIZE];
@ -2473,7 +2473,7 @@ static int pkt_make_request(struct request_queue *q, struct bio *bio)
cloned_bio->bi_end_io = pkt_end_io_read_cloned;
pd->stats.secs_r += bio->bi_size >> 9;
pkt_queue_bio(pd, cloned_bio);
return 0;
return;
}
if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
@ -2509,7 +2509,7 @@ static int pkt_make_request(struct request_queue *q, struct bio *bio)
pkt_make_request(q, &bp->bio1);
pkt_make_request(q, &bp->bio2);
bio_pair_release(bp);
return 0;
return;
}
}
@ -2533,7 +2533,7 @@ static int pkt_make_request(struct request_queue *q, struct bio *bio)
}
spin_unlock(&pkt->lock);
spin_unlock(&pd->cdrw.active_list_lock);
return 0;
return;
} else {
blocked_bio = 1;
}
@ -2584,10 +2584,9 @@ static int pkt_make_request(struct request_queue *q, struct bio *bio)
*/
wake_up(&pd->wqueue);
}
return 0;
return;
end_io:
bio_io_error(bio);
return 0;
}

6
drivers/block/ps3vram.c
View File

@ -596,7 +596,7 @@ out:
return next;
}
static int ps3vram_make_request(struct request_queue *q, struct bio *bio)
static void ps3vram_make_request(struct request_queue *q, struct bio *bio)
{
struct ps3_system_bus_device *dev = q->queuedata;
struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
@ -610,13 +610,11 @@ static int ps3vram_make_request(struct request_queue *q, struct bio *bio)
spin_unlock_irq(&priv->lock);
if (busy)
return 0;
return;
do {
bio = ps3vram_do_bio(dev, bio);
} while (bio);
return 0;
}
static int __devinit ps3vram_probe(struct ps3_system_bus_device *dev)

4
drivers/block/umem.c
View File

@ -513,7 +513,7 @@ static void process_page(unsigned long data)
}
}
static int mm_make_request(struct request_queue *q, struct bio *bio)
static void mm_make_request(struct request_queue *q, struct bio *bio)
{
struct cardinfo *card = q->queuedata;
pr_debug("mm_make_request %llu %u\n",
@ -525,7 +525,7 @@ static int mm_make_request(struct request_queue *q, struct bio *bio)
card->biotail = &bio->bi_next;
spin_unlock_irq(&card->lock);
return 0;
return;
}
static irqreturn_t mm_interrupt(int irq, void *__card)

25
drivers/md/dm.c
View File

@ -192,9 +192,6 @@ struct mapped_device {
/* forced geometry settings */
struct hd_geometry geometry;
/* For saving the address of __make_request for request based dm */
make_request_fn *saved_make_request_fn;
/* sysfs handle */
struct kobject kobj;
@ -1403,7 +1400,7 @@ out:
* The request function that just remaps the bio built up by
* dm_merge_bvec.
*/
static int _dm_request(struct request_queue *q, struct bio *bio)
static void _dm_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
@ -1424,19 +1421,12 @@ static int _dm_request(struct request_queue *q, struct bio *bio)
queue_io(md, bio);
else
bio_io_error(bio);
return 0;
return;
}
__split_and_process_bio(md, bio);
up_read(&md->io_lock);
return 0;
}
static int dm_make_request(struct request_queue *q, struct bio *bio)
{
struct mapped_device *md = q->queuedata;
return md->saved_make_request_fn(q, bio); /* call __make_request() */
return;
}
static int dm_request_based(struct mapped_device *md)
@ -1444,14 +1434,14 @@ static int dm_request_based(struct mapped_device *md)
return blk_queue_stackable(md->queue);
}
static int dm_request(struct request_queue *q, struct bio *bio)
static void dm_request(struct request_queue *q, struct bio *bio)
{
struct mapped_device *md = q->queuedata;
if (dm_request_based(md))
return dm_make_request(q, bio);
return _dm_request(q, bio);
blk_queue_bio(q, bio);
else
_dm_request(q, bio);
}
void dm_dispatch_request(struct request *rq)
@ -2191,7 +2181,6 @@ static int dm_init_request_based_queue(struct mapped_device *md)
return 0;
md->queue = q;
md->saved_make_request_fn = md->queue->make_request_fn;
dm_init_md_queue(md);
blk_queue_softirq_done(md->queue, dm_softirq_done);
blk_queue_prep_rq(md->queue, dm_prep_fn);

14
drivers/md/faulty.c
View File

@ -169,7 +169,7 @@ static void add_sector(struct faulty_conf *conf, sector_t start, int mode)
conf->nfaults = n+1;
}
static int make_request(struct mddev *mddev, struct bio *bio)
static void make_request(struct mddev *mddev, struct bio *bio)
{
struct faulty_conf *conf = mddev->private;
int failit = 0;
@ -181,7 +181,7 @@ static int make_request(struct mddev *mddev, struct bio *bio)
* just fail immediately
*/
bio_endio(bio, -EIO);
return 0;
return;
}
if (check_sector(conf, bio->bi_sector, bio->bi_sector+(bio->bi_size>>9),
@ -211,15 +211,15 @@ static int make_request(struct mddev *mddev, struct bio *bio)
}
if (failit) {
struct bio *b = bio_clone_mddev(bio, GFP_NOIO, mddev);
b->bi_bdev = conf->rdev->bdev;
b->bi_private = bio;
b->bi_end_io = faulty_fail;
generic_make_request(b);
return 0;
} else {
bio = b;
} else
bio->bi_bdev = conf->rdev->bdev;
return 1;
}
generic_make_request(bio);
}
static void status(struct seq_file *seq, struct mddev *mddev)

17
drivers/md/linear.c
View File

@ -264,14 +264,14 @@ static int linear_stop (struct mddev *mddev)
return 0;
}
static int linear_make_request (struct mddev *mddev, struct bio *bio)
static void linear_make_request(struct mddev *mddev, struct bio *bio)
{
struct dev_info *tmp_dev;
sector_t start_sector;
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bio);
return 0;
return;
}
rcu_read_lock();
@ -293,7 +293,7 @@ static int linear_make_request (struct mddev *mddev, struct bio *bio)
(unsigned long long)start_sector);
rcu_read_unlock();
bio_io_error(bio);
return 0;
return;
}
if (unlikely(bio->bi_sector + (bio->bi_size >> 9) >
tmp_dev->end_sector)) {
@ -307,20 +307,17 @@ static int linear_make_request (struct mddev *mddev, struct bio *bio)
bp = bio_split(bio, end_sector - bio->bi_sector);
if (linear_make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
if (linear_make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
linear_make_request(mddev, &bp->bio1);
linear_make_request(mddev, &bp->bio2);
bio_pair_release(bp);
return 0;
return;
}
bio->bi_bdev = tmp_dev->rdev->bdev;
bio->bi_sector = bio->bi_sector - start_sector
+ tmp_dev->rdev->data_offset;
rcu_read_unlock();
return 1;
generic_make_request(bio);
}
static void linear_status (struct seq_file *seq, struct mddev *mddev)

12
drivers/md/md.c
View File

@ -332,18 +332,17 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
* call has finished, the bio has been linked into some internal structure
* and so is visible to ->quiesce(), so we don't need the refcount any more.
*/
static int md_make_request(struct request_queue *q, struct bio *bio)
static void md_make_request(struct request_queue *q, struct bio *bio)
{
const int rw = bio_data_dir(bio);
struct mddev *mddev = q->queuedata;
int rv;
int cpu;
unsigned int sectors;
if (mddev == NULL || mddev->pers == NULL
|| !mddev->ready) {
bio_io_error(bio);
return 0;
return;
}
smp_rmb(); /* Ensure implications of 'active' are visible */
rcu_read_lock();
@ -368,7 +367,7 @@ static int md_make_request(struct request_queue *q, struct bio *bio)
* go away inside make_request
*/
sectors = bio_sectors(bio);
rv = mddev->pers->make_request(mddev, bio);
mddev->pers->make_request(mddev, bio);
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
@ -377,8 +376,6 @@ static int md_make_request(struct request_queue *q, struct bio *bio)
if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
wake_up(&mddev->sb_wait);
return rv;
}
/* mddev_suspend makes sure no new requests are submitted
@ -477,8 +474,7 @@ static void md_submit_flush_data(struct work_struct *ws)
bio_endio(bio, 0);
else {
bio->bi_rw &= ~REQ_FLUSH;
if (mddev->pers->make_request(mddev, bio))
generic_make_request(bio);
mddev->pers->make_request(mddev, bio);
}
mddev->flush_bio = NULL;

2
drivers/md/md.h
View File

@ -419,7 +419,7 @@ struct md_personality
int level;
struct list_head list;
struct module *owner;
int (*make_request)(struct mddev *mddev, struct bio *bio);
void (*make_request)(struct mddev *mddev, struct bio *bio);
int (*run)(struct mddev *mddev);
int (*stop)(struct mddev *mddev);
void (*status)(struct seq_file *seq, struct mddev *mddev);

8
drivers/md/multipath.c
View File

@ -106,7 +106,7 @@ static void multipath_end_request(struct bio *bio, int error)
rdev_dec_pending(rdev, conf->mddev);
}
static int multipath_make_request(struct mddev *mddev, struct bio * bio)
static void multipath_make_request(struct mddev *mddev, struct bio * bio)
{
struct mpconf *conf = mddev->private;
struct multipath_bh * mp_bh;
@ -114,7 +114,7 @@ static int multipath_make_request(struct mddev *mddev, struct bio * bio)
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bio);
return 0;
return;
}
mp_bh = mempool_alloc(conf->pool, GFP_NOIO);
@ -126,7 +126,7 @@ static int multipath_make_request(struct mddev *mddev, struct bio * bio)
if (mp_bh->path < 0) {
bio_endio(bio, -EIO);
mempool_free(mp_bh, conf->pool);
return 0;
return;
}
multipath = conf->multipaths + mp_bh->path;
@ -137,7 +137,7 @@ static int multipath_make_request(struct mddev *mddev, struct bio * bio)
mp_bh->bio.bi_end_io = multipath_end_request;
mp_bh->bio.bi_private = mp_bh;
generic_make_request(&mp_bh->bio);
return 0;
return;
}
static void multipath_status (struct seq_file *seq, struct mddev *mddev)

22
drivers/md/raid0.c
View File

@ -468,7 +468,7 @@ static inline int is_io_in_chunk_boundary(struct mddev *mddev,
}
}
static int raid0_make_request(struct mddev *mddev, struct bio *bio)
static void raid0_make_request(struct mddev *mddev, struct bio *bio)
{
unsigned int chunk_sects;
sector_t sector_offset;
@ -477,7 +477,7 @@ static int raid0_make_request(struct mddev *mddev, struct bio *bio)
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bio);
return 0;
return;
}
chunk_sects = mddev->chunk_sectors;
@ -497,13 +497,10 @@ static int raid0_make_request(struct mddev *mddev, struct bio *bio)
else
bp = bio_split(bio, chunk_sects -
sector_div(sector, chunk_sects));
if (raid0_make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
if (raid0_make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
raid0_make_request(mddev, &bp->bio1);
raid0_make_request(mddev, &bp->bio2);
bio_pair_release(bp);
return 0;
return;
}
sector_offset = bio->bi_sector;
@ -513,10 +510,9 @@ static int raid0_make_request(struct mddev *mddev, struct bio *bio)
bio->bi_bdev = tmp_dev->bdev;
bio->bi_sector = sector_offset + zone->dev_start +
tmp_dev->data_offset;
/*
* Let the main block layer submit the IO and resolve recursion:
*/
return 1;
generic_make_request(bio);
return;
bad_map:
printk("md/raid0:%s: make_request bug: can't convert block across chunks"
@ -525,7 +521,7 @@ bad_map:
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
bio_io_error(bio);
return 0;
return;
}
static void raid0_status(struct seq_file *seq, struct mddev *mddev)

9
drivers/md/raid1.c
View File

@ -807,7 +807,7 @@ do_sync_io:
pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size);
}
static int make_request(struct mddev *mddev, struct bio * bio)
static void make_request(struct mddev *mddev, struct bio * bio)
{
struct r1conf *conf = mddev->private;
struct mirror_info *mirror;
@ -892,7 +892,7 @@ read_again:
if (rdisk < 0) {
/* couldn't find anywhere to read from */
raid_end_bio_io(r1_bio);
return 0;
return;
}
mirror = conf->mirrors + rdisk;
@ -950,7 +950,7 @@ read_again:
goto read_again;
} else
generic_make_request(read_bio);
return 0;
return;
}
/*
@ -1151,8 +1151,6 @@ read_again:
if (do_sync || !bitmap || !plugged)
md_wakeup_thread(mddev->thread);
return 0;
}
static void status(struct seq_file *seq, struct mddev *mddev)
@ -2193,7 +2191,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
bio->bi_next = NULL;
bio->bi_flags &= ~(BIO_POOL_MASK-1);
bio->bi_flags |= 1 << BIO_UPTODATE;
bio->bi_comp_cpu = -1;
bio->bi_rw = READ;
bio->bi_vcnt = 0;
bio->bi_idx = 0;

19
drivers/md/raid10.c
View File

@ -842,7 +842,7 @@ static void unfreeze_array(struct r10conf *conf)
spin_unlock_irq(&conf->resync_lock);
}
static int make_request(struct mddev *mddev, struct bio * bio)
static void make_request(struct mddev *mddev, struct bio * bio)
{
struct r10conf *conf = mddev->private;
struct mirror_info *mirror;
@ -861,7 +861,7 @@ static int make_request(struct mddev *mddev, struct bio * bio)
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bio);
return 0;
return;
}
/* If this request crosses a chunk boundary, we need to
@ -893,10 +893,8 @@ static int make_request(struct mddev *mddev, struct bio * bio)
conf->nr_waiting++;
spin_unlock_irq(&conf->resync_lock);
if (make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
if (make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
make_request(mddev, &bp->bio1);
make_request(mddev, &bp->bio2);
spin_lock_irq(&conf->resync_lock);
conf->nr_waiting--;
@ -904,14 +902,14 @@ static int make_request(struct mddev *mddev, struct bio * bio)
spin_unlock_irq(&conf->resync_lock);
bio_pair_release(bp);
return 0;
return;
bad_map:
printk("md/raid10:%s: make_request bug: can't convert block across chunks"
" or bigger than %dk %llu %d\n", mdname(mddev), chunk_sects/2,
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
bio_io_error(bio);
return 0;
return;
}
md_write_start(mddev, bio);
@ -954,7 +952,7 @@ read_again:
slot = r10_bio->read_slot;
if (disk < 0) {
raid_end_bio_io(r10_bio);
return 0;
return;
}
mirror = conf->mirrors + disk;
@ -1002,7 +1000,7 @@ read_again:
goto read_again;
} else
generic_make_request(read_bio);
return 0;
return;
}
/*
@ -1176,7 +1174,6 @@ retry_write:
if (do_sync || !mddev->bitmap || !plugged)
md_wakeup_thread(mddev->thread);
return 0;
}
static void status(struct seq_file *seq, struct mddev *mddev)

8
drivers/md/raid5.c
View File

@ -3688,7 +3688,7 @@ static struct stripe_head *__get_priority_stripe(struct r5conf *conf)
return sh;
}
static int make_request(struct mddev *mddev, struct bio * bi)
static void make_request(struct mddev *mddev, struct bio * bi)
{
struct r5conf *conf = mddev->private;
int dd_idx;
@ -3701,7 +3701,7 @@ static int make_request(struct mddev *mddev, struct bio * bi)
if (unlikely(bi->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bi);
return 0;
return;
}
md_write_start(mddev, bi);
@ -3709,7 +3709,7 @@ static int make_request(struct mddev *mddev, struct bio * bi)
if (rw == READ &&
mddev->reshape_position == MaxSector &&
chunk_aligned_read(mddev,bi))
return 0;
return;
logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1);
last_sector = bi->bi_sector + (bi->bi_size>>9);
@ -3844,8 +3844,6 @@ static int make_request(struct mddev *mddev, struct bio * bi)
bio_endio(bi, 0);
}
return 0;
}
static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks);

7
drivers/s390/block/dcssblk.c
View File

@ -27,7 +27,7 @@
static int dcssblk_open(struct block_device *bdev, fmode_t mode);
static int dcssblk_release(struct gendisk *disk, fmode_t mode);
static int dcssblk_make_request(struct request_queue *q, struct bio *bio);
static void dcssblk_make_request(struct request_queue *q, struct bio *bio);
static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
void **kaddr, unsigned long *pfn);
@ -814,7 +814,7 @@ out:
return rc;
}
static int
static void
dcssblk_make_request(struct request_queue *q, struct bio *bio)
{
struct dcssblk_dev_info *dev_info;
@ -871,10 +871,9 @@ dcssblk_make_request(struct request_queue *q, struct bio *bio)
bytes_done += bvec->bv_len;
}
bio_endio(bio, 0);
return 0;
return;
fail:
bio_io_error(bio);
return 0;
}
static int

5
drivers/s390/block/xpram.c
View File

@ -181,7 +181,7 @@ static unsigned long xpram_highest_page_index(void)
/*
* Block device make request function.
*/
static int xpram_make_request(struct request_queue *q, struct bio *bio)
static void xpram_make_request(struct request_queue *q, struct bio *bio)
{
xpram_device_t *xdev = bio->bi_bdev->bd_disk->private_data;
struct bio_vec *bvec;
@ -221,10 +221,9 @@ static int xpram_make_request(struct request_queue *q, struct bio *bio)
}
set_bit(BIO_UPTODATE, &bio->bi_flags);
bio_endio(bio, 0);
return 0;
return;
fail:
bio_io_error(bio);
return 0;
}
static int xpram_getgeo(struct block_device *bdev, struct hd_geometry *geo)

5
drivers/staging/zram/zram_drv.c
View File

@ -556,7 +556,7 @@ static inline int valid_io_request(struct zram *zram, struct bio *bio)
/*
* Handler function for all zram I/O requests.
*/
static int zram_make_request(struct request_queue *queue, struct bio *bio)
static void zram_make_request(struct request_queue *queue, struct bio *bio)
{
struct zram *zram = queue->queuedata;
@ -575,13 +575,12 @@ static int zram_make_request(struct request_queue *queue, struct bio *bio)
__zram_make_request(zram, bio, bio_data_dir(bio));
up_read(&zram->init_lock);
return 0;
return;
error_unlock:
up_read(&zram->init_lock);
error:
bio_io_error(bio);
return 0;
}
void __zram_reset_device(struct zram *zram)

1
fs/bio.c
View File

@ -255,7 +255,6 @@ void bio_init(struct bio *bio)
{
memset(bio, 0, sizeof(*bio));
bio->bi_flags = 1 << BIO_UPTODATE;
bio->bi_comp_cpu = -1;
atomic_set(&bio->bi_cnt, 1);
}
EXPORT_SYMBOL(bio_init);

13
fs/block_dev.c
View File

@ -1085,6 +1085,7 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
{
struct gendisk *disk;
struct module *owner;
int ret;
int partno;
int perm = 0;
@ -1110,6 +1111,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
disk = get_gendisk(bdev->bd_dev, &partno);
if (!disk)
goto out;
owner = disk->fops->owner;
disk_block_events(disk);
mutex_lock_nested(&bdev->bd_mutex, for_part);
@ -1137,8 +1139,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_disk = NULL;
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
module_put(disk->fops->owner);
put_disk(disk);
module_put(owner);
goto restart;
}
}
@ -1194,8 +1196,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
goto out_unlock_bdev;
}
/* only one opener holds refs to the module and disk */
module_put(disk->fops->owner);
put_disk(disk);
module_put(owner);
}
bdev->bd_openers++;
if (for_part)
@ -1215,8 +1217,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
module_put(disk->fops->owner);
put_disk(disk);
module_put(owner);
out:
bdput(bdev);
@ -1442,14 +1444,15 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
if (!bdev->bd_openers) {
struct module *owner = disk->fops->owner;
put_disk(disk);
module_put(owner);
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
bdev->bd_disk = NULL;
if (bdev != bdev->bd_contains)
victim = bdev->bd_contains;
bdev->bd_contains = NULL;
put_disk(disk);
module_put(owner);
}
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);

8
include/linux/bio.h
View File

@ -268,14 +268,6 @@ extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set
extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
extern unsigned int bvec_nr_vecs(unsigned short idx);
/*
* Allow queuer to specify a completion CPU for this bio
*/
static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
{
bio->bi_comp_cpu = cpu;
}
/*
* bio_set is used to allow other portions of the IO system to
* allocate their own private memory pools for bio and iovec structures.

11
include/linux/blk_types.h
View File

@ -59,8 +59,6 @@ struct bio {
unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
unsigned int bi_comp_cpu; /* completion CPU */
atomic_t bi_cnt; /* pin count */
struct bio_vec *bi_io_vec; /* the actual vec list */
@ -93,11 +91,10 @@ struct bio {
#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_CPU_AFFINE 8 /* complete bio on same CPU as submitted */
#define BIO_NULL_MAPPED 9 /* contains invalid user pages */
#define BIO_FS_INTEGRITY 10 /* fs owns integrity data, not block layer */
#define BIO_QUIET 11 /* Make BIO Quiet */
#define BIO_MAPPED_INTEGRITY 12/* integrity metadata has been remapped */
#define BIO_NULL_MAPPED 8 /* contains invalid user pages */
#define BIO_FS_INTEGRITY 9 /* fs owns integrity data, not block layer */
#define BIO_QUIET 10 /* Make BIO Quiet */
#define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */
#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
/*

40
include/linux/blkdev.h
View File

@ -195,7 +195,7 @@ struct request_pm_state
#include <linux/elevator.h>
typedef void (request_fn_proc) (struct request_queue *q);
typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef void (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef int (prep_rq_fn) (struct request_queue *, struct request *);
typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
@ -680,6 +680,8 @@ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
struct scsi_ioctl_command __user *);
extern void blk_queue_bio(struct request_queue *q, struct bio *bio);
/*
* A queue has just exitted congestion. Note this in the global counter of
* congested queues, and wake up anyone who was waiting for requests to be
@ -863,16 +865,22 @@ struct request_queue *blk_alloc_queue_node(gfp_t, int);
extern void blk_put_queue(struct request_queue *);
/*
* Note: Code in between changing the blk_plug list/cb_list or element of such
* lists is preemptable, but such code can't do sleep (or be very careful),
* otherwise data is corrupted. For details, please check schedule() where
* blk_schedule_flush_plug() is called.
* blk_plug permits building a queue of related requests by holding the I/O
* fragments for a short period. This allows merging of sequential requests
* into single larger request. As the requests are moved from a per-task list to
* the device's request_queue in a batch, this results in improved scalability
* as the lock contention for request_queue lock is reduced.
*
* It is ok not to disable preemption when adding the request to the plug list
* or when attempting a merge, because blk_schedule_flush_list() will only flush
* the plug list when the task sleeps by itself. For details, please see
* schedule() where blk_schedule_flush_plug() is called.
*/
struct blk_plug {
unsigned long magic;
struct list_head list;
struct list_head cb_list;
unsigned int should_sort;
unsigned long magic; /* detect uninitialized use-cases */
struct list_head list; /* requests */
struct list_head cb_list; /* md requires an unplug callback */
unsigned int should_sort; /* list to be sorted before flushing? */
};
#define BLK_MAX_REQUEST_COUNT 16
@ -1189,20 +1197,6 @@ static inline uint64_t rq_io_start_time_ns(struct request *req)
}
#endif
#ifdef CONFIG_BLK_DEV_THROTTLING
extern int blk_throtl_init(struct request_queue *q);
extern void blk_throtl_exit(struct request_queue *q);
extern int blk_throtl_bio(struct request_queue *q, struct bio **bio);
#else /* CONFIG_BLK_DEV_THROTTLING */
static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio)
{
return 0;
}
static inline int blk_throtl_init(struct request_queue *q) { return 0; }
static inline int blk_throtl_exit(struct request_queue *q) { return 0; }
#endif /* CONFIG_BLK_DEV_THROTTLING */
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \

6
include/linux/elevator.h
View File

@ -38,6 +38,12 @@ struct elevator_ops
elevator_merged_fn *elevator_merged_fn;
elevator_merge_req_fn *elevator_merge_req_fn;
elevator_allow_merge_fn *elevator_allow_merge_fn;
/*
* Used for both plugged list and elevator merging and in the
* former case called without queue_lock. Read comment on top of
* attempt_plug_merge() for details.
*/
elevator_bio_merged_fn *elevator_bio_merged_fn;
elevator_dispatch_fn *elevator_dispatch_fn;

1
include/linux/loop.h
View File

@ -73,7 +73,6 @@ struct loop_device {
*/
enum {
LO_FLAGS_READ_ONLY = 1,
LO_FLAGS_USE_AOPS = 2,
LO_FLAGS_AUTOCLEAR = 4,
};

9
mm/bounce.c
View File

@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/hash.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <asm/tlbflush.h>
#include <trace/events/block.h>
@ -26,12 +27,10 @@ static mempool_t *page_pool, *isa_page_pool;
#ifdef CONFIG_HIGHMEM
static __init int init_emergency_pool(void)
{
struct sysinfo i;
si_meminfo(&i);
si_swapinfo(&i);
if (!i.totalhigh)
#ifndef CONFIG_MEMORY_HOTPLUG
if (max_pfn <= max_low_pfn)
return 0;
#endif
page_pool = mempool_create_page_pool(POOL_SIZE, 0);
BUG_ON(!page_pool);