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

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* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  Revert "relay: fix splice problem"
  docbook: fix bio missing parameter
  block: use unitialized_var() in bio_alloc_bioset()
  block: avoid duplicate calls to get_part() in disk stat code
  cfq-iosched: make io priorities inherit CPU scheduling class as well as nice
  block: optimize generic_unplug_device()
  block: get rid of likely/unlikely predictions in merge logic
  vfs: splice remove_suid() cleanup
  cfq-iosched: fix RCU race in the cfq io_context destructor handling
  block: adjust tagging function queue bit locking
  block: sysfs store function needs to grab queue_lock and use queue_flag_*()
This commit is contained in:
Linus Torvalds 2008-05-08 10:48:36 -07:00
commit 7a34912d90
14 changed files with 103 additions and 73 deletions
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26
block/blk-core.c
View File

@ -54,15 +54,16 @@ static DEFINE_PER_CPU(struct list_head, blk_cpu_done);
static void drive_stat_acct(struct request *rq, int new_io)
{
struct hd_struct *part;
int rw = rq_data_dir(rq);
if (!blk_fs_request(rq) || !rq->rq_disk)
return;
if (!new_io) {
__all_stat_inc(rq->rq_disk, merges[rw], rq->sector);
} else {
struct hd_struct *part = get_part(rq->rq_disk, rq->sector);
part = get_part(rq->rq_disk, rq->sector);
if (!new_io)
__all_stat_inc(rq->rq_disk, part, merges[rw], rq->sector);
else {
disk_round_stats(rq->rq_disk);
rq->rq_disk->in_flight++;
if (part) {
@ -253,9 +254,11 @@ EXPORT_SYMBOL(__generic_unplug_device);
**/
void generic_unplug_device(struct request_queue *q)
{
spin_lock_irq(q->queue_lock);
__generic_unplug_device(q);
spin_unlock_irq(q->queue_lock);
if (blk_queue_plugged(q)) {
spin_lock_irq(q->queue_lock);
__generic_unplug_device(q);
spin_unlock_irq(q->queue_lock);
}
}
EXPORT_SYMBOL(generic_unplug_device);
@ -1536,10 +1539,11 @@ static int __end_that_request_first(struct request *req, int error,
}
if (blk_fs_request(req) && req->rq_disk) {
struct hd_struct *part = get_part(req->rq_disk, req->sector);
const int rw = rq_data_dir(req);
all_stat_add(req->rq_disk, sectors[rw],
nr_bytes >> 9, req->sector);
all_stat_add(req->rq_disk, part, sectors[rw],
nr_bytes >> 9, req->sector);
}
total_bytes = bio_nbytes = 0;
@ -1725,8 +1729,8 @@ static void end_that_request_last(struct request *req, int error)
const int rw = rq_data_dir(req);
struct hd_struct *part = get_part(disk, req->sector);
__all_stat_inc(disk, ios[rw], req->sector);
__all_stat_add(disk, ticks[rw], duration, req->sector);
__all_stat_inc(disk, part, ios[rw], req->sector);
__all_stat_add(disk, part, ticks[rw], duration, req->sector);
disk_round_stats(disk);
disk->in_flight--;
if (part) {

2
block/blk-ioc.c
View File

@ -41,8 +41,8 @@ int put_io_context(struct io_context *ioc)
rcu_read_lock();
if (ioc->aic && ioc->aic->dtor)
ioc->aic->dtor(ioc->aic);
rcu_read_unlock();
cfq_dtor(ioc);
rcu_read_unlock();
kmem_cache_free(iocontext_cachep, ioc);
return 1;

12
block/blk-merge.c
View File

@ -149,9 +149,9 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
static int blk_hw_contig_segment(struct request_queue *q, struct bio *bio,
struct bio *nxt)
{
if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
if (unlikely(!bio_flagged(nxt, BIO_SEG_VALID)))
if (!bio_flagged(nxt, BIO_SEG_VALID))
blk_recount_segments(q, nxt);
if (!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) ||
BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size))
@ -312,9 +312,9 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
q->last_merge = NULL;
return 0;
}
if (unlikely(!bio_flagged(req->biotail, BIO_SEG_VALID)))
if (!bio_flagged(req->biotail, BIO_SEG_VALID))
blk_recount_segments(q, req->biotail);
if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size;
if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio))
@ -352,9 +352,9 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
return 0;
}
len = bio->bi_hw_back_size + req->bio->bi_hw_front_size;
if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
if (unlikely(!bio_flagged(req->bio, BIO_SEG_VALID)))
if (!bio_flagged(req->bio, BIO_SEG_VALID))
blk_recount_segments(q, req->bio);
if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(req->bio)) &&
!BIOVEC_VIRT_OVERSIZE(len)) {

6
block/blk-sysfs.c
View File

@ -146,11 +146,13 @@ static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
unsigned long nm;
ssize_t ret = queue_var_store(&nm, page, count);
spin_lock_irq(q->queue_lock);
if (nm)
set_bit(QUEUE_FLAG_NOMERGES, &q->queue_flags);
queue_flag_set(QUEUE_FLAG_NOMERGES, q);
else
clear_bit(QUEUE_FLAG_NOMERGES, &q->queue_flags);
queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
spin_unlock_irq(q->queue_lock);
return ret;
}

9
block/blk-tag.c
View File

@ -70,7 +70,7 @@ void __blk_queue_free_tags(struct request_queue *q)
__blk_free_tags(bqt);
q->queue_tags = NULL;
queue_flag_clear(QUEUE_FLAG_QUEUED, q);
queue_flag_clear_unlocked(QUEUE_FLAG_QUEUED, q);
}
/**
@ -98,7 +98,7 @@ EXPORT_SYMBOL(blk_free_tags);
**/
void blk_queue_free_tags(struct request_queue *q)
{
queue_flag_clear(QUEUE_FLAG_QUEUED, q);
queue_flag_clear_unlocked(QUEUE_FLAG_QUEUED, q);
}
EXPORT_SYMBOL(blk_queue_free_tags);
@ -171,6 +171,9 @@ EXPORT_SYMBOL(blk_init_tags);
* @q: the request queue for the device
* @depth: the maximum queue depth supported
* @tags: the tag to use
*
* Queue lock must be held here if the function is called to resize an
* existing map.
**/
int blk_queue_init_tags(struct request_queue *q, int depth,
struct blk_queue_tag *tags)
@ -197,7 +200,7 @@ int blk_queue_init_tags(struct request_queue *q, int depth,
* assign it, all done
*/
q->queue_tags = tags;
queue_flag_set(QUEUE_FLAG_QUEUED, q);
queue_flag_set_unlocked(QUEUE_FLAG_QUEUED, q);
INIT_LIST_HEAD(&q->tag_busy_list);
return 0;
fail:

23
block/cfq-iosched.c
View File

@ -1142,6 +1142,17 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
kmem_cache_free(cfq_pool, cfqq);
}
static void
__call_for_each_cic(struct io_context *ioc,
void (*func)(struct io_context *, struct cfq_io_context *))
{
struct cfq_io_context *cic;
struct hlist_node *n;
hlist_for_each_entry_rcu(cic, n, &ioc->cic_list, cic_list)
func(ioc, cic);
}
/*
* Call func for each cic attached to this ioc.
*/
@ -1149,12 +1160,8 @@ static void
call_for_each_cic(struct io_context *ioc,
void (*func)(struct io_context *, struct cfq_io_context *))
{
struct cfq_io_context *cic;
struct hlist_node *n;
rcu_read_lock();
hlist_for_each_entry_rcu(cic, n, &ioc->cic_list, cic_list)
func(ioc, cic);
__call_for_each_cic(ioc, func);
rcu_read_unlock();
}
@ -1198,7 +1205,7 @@ static void cfq_free_io_context(struct io_context *ioc)
* should be ok to iterate over the known list, we will see all cic's
* since no new ones are added.
*/
call_for_each_cic(ioc, cic_free_func);
__call_for_each_cic(ioc, cic_free_func);
}
static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq)
@ -1296,10 +1303,10 @@ static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
printk(KERN_ERR "cfq: bad prio %x\n", ioprio_class);
case IOPRIO_CLASS_NONE:
/*
* no prio set, place us in the middle of the BE classes
* no prio set, inherit CPU scheduling settings
*/
cfqq->ioprio = task_nice_ioprio(tsk);
cfqq->ioprio_class = IOPRIO_CLASS_BE;
cfqq->ioprio_class = task_nice_ioclass(tsk);
break;
case IOPRIO_CLASS_RT:
cfqq->ioprio = task_ioprio(ioc);

10
drivers/block/aoe/aoecmd.c
View File

@ -755,11 +755,13 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
{
unsigned long n_sect = bio->bi_size >> 9;
const int rw = bio_data_dir(bio);
struct hd_struct *part;
all_stat_inc(disk, ios[rw], sector);
all_stat_add(disk, ticks[rw], duration, sector);
all_stat_add(disk, sectors[rw], n_sect, sector);
all_stat_add(disk, io_ticks, duration, sector);
part = get_part(disk, sector);
all_stat_inc(disk, part, ios[rw], sector);
all_stat_add(disk, part, ticks[rw], duration, sector);
all_stat_add(disk, part, sectors[rw], n_sect, sector);
all_stat_add(disk, part, io_ticks, duration, sector);
}
void

3
fs/bio.c
View File

@ -158,7 +158,7 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
bio_init(bio);
if (likely(nr_iovecs)) {
unsigned long idx = 0; /* shut up gcc */
unsigned long uninitialized_var(idx);
bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs);
if (unlikely(!bvl)) {
@ -963,6 +963,7 @@ static void bio_copy_kern_endio(struct bio *bio, int err)
* @data: pointer to buffer to copy
* @len: length in bytes
* @gfp_mask: allocation flags for bio and page allocation
* @reading: data direction is READ
*
* copy the kernel address into a bio suitable for io to a block
* device. Returns an error pointer in case of error.

31
fs/splice.c
View File

@ -811,24 +811,19 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
{
struct address_space *mapping = out->f_mapping;
struct inode *inode = mapping->host;
int killsuid, killpriv;
struct splice_desc sd = {
.total_len = len,
.flags = flags,
.pos = *ppos,
.u.file = out,
};
ssize_t ret;
int err = 0;
killpriv = security_inode_need_killpriv(out->f_path.dentry);
killsuid = should_remove_suid(out->f_path.dentry);
if (unlikely(killsuid || killpriv)) {
mutex_lock(&inode->i_mutex);
if (killpriv)
err = security_inode_killpriv(out->f_path.dentry);
if (!err && killsuid)
err = __remove_suid(out->f_path.dentry, killsuid);
mutex_unlock(&inode->i_mutex);
if (err)
return err;
}
ret = splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_file);
inode_double_lock(inode, pipe->inode);
ret = remove_suid(out->f_path.dentry);
if (likely(!ret))
ret = __splice_from_pipe(pipe, &sd, pipe_to_file);
inode_double_unlock(inode, pipe->inode);
if (ret > 0) {
unsigned long nr_pages;
@ -840,6 +835,8 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
* sync it.
*/
if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
int err;
mutex_lock(&inode->i_mutex);
err = generic_osync_inode(inode, mapping,
OSYNC_METADATA|OSYNC_DATA);
@ -1075,7 +1072,7 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
ret = splice_direct_to_actor(in, &sd, direct_splice_actor);
if (ret > 0)
*ppos = sd.pos;
*ppos += ret;
return ret;
}

1
include/linux/fs.h
View File

@ -1816,7 +1816,6 @@ extern void iget_failed(struct inode *);
extern void clear_inode(struct inode *);
extern void destroy_inode(struct inode *);
extern struct inode *new_inode(struct super_block *);
extern int __remove_suid(struct dentry *, int);
extern int should_remove_suid(struct dentry *);
extern int remove_suid(struct dentry *);

35
include/linux/genhd.h
View File

@ -178,17 +178,17 @@ static inline struct hd_struct *get_part(struct gendisk *gendiskp,
static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
int i;
for_each_possible_cpu(i)
memset(per_cpu_ptr(gendiskp->dkstats, i), value,
sizeof (struct disk_stats));
sizeof(struct disk_stats));
}
#define __part_stat_add(part, field, addnd) \
(per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
#define __all_stat_add(gendiskp, field, addnd, sector) \
#define __all_stat_add(gendiskp, part, field, addnd, sector) \
({ \
struct hd_struct *part = get_part(gendiskp, sector); \
if (part) \
__part_stat_add(part, field, addnd); \
__disk_stat_add(gendiskp, field, addnd); \
@ -203,11 +203,13 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
res; \
})
static inline void part_stat_set_all(struct hd_struct *part, int value) {
static inline void part_stat_set_all(struct hd_struct *part, int value)
{
int i;
for_each_possible_cpu(i)
memset(per_cpu_ptr(part->dkstats, i), value,
sizeof(struct disk_stats));
sizeof(struct disk_stats));
}
#else /* !CONFIG_SMP */
@ -223,9 +225,8 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
#define __part_stat_add(part, field, addnd) \
(part->dkstats.field += addnd)
#define __all_stat_add(gendiskp, field, addnd, sector) \
#define __all_stat_add(gendiskp, part, field, addnd, sector) \
({ \
struct hd_struct *part = get_part(gendiskp, sector); \
if (part) \
part->dkstats.field += addnd; \
__disk_stat_add(gendiskp, field, addnd); \
@ -276,10 +277,10 @@ static inline void part_stat_set_all(struct hd_struct *part, int value)
#define part_stat_sub(gendiskp, field, subnd) \
part_stat_add(gendiskp, field, -subnd)
#define all_stat_add(gendiskp, field, addnd, sector) \
#define all_stat_add(gendiskp, part, field, addnd, sector) \
do { \
preempt_disable(); \
__all_stat_add(gendiskp, field, addnd, sector); \
__all_stat_add(gendiskp, part, field, addnd, sector); \
preempt_enable(); \
} while (0)
@ -288,15 +289,15 @@ static inline void part_stat_set_all(struct hd_struct *part, int value)
#define all_stat_dec(gendiskp, field, sector) \
all_stat_add(gendiskp, field, -1, sector)
#define __all_stat_inc(gendiskp, field, sector) \
__all_stat_add(gendiskp, field, 1, sector)
#define all_stat_inc(gendiskp, field, sector) \
all_stat_add(gendiskp, field, 1, sector)
#define __all_stat_inc(gendiskp, part, field, sector) \
__all_stat_add(gendiskp, part, field, 1, sector)
#define all_stat_inc(gendiskp, part, field, sector) \
all_stat_add(gendiskp, part, field, 1, sector)
#define __all_stat_sub(gendiskp, field, subnd, sector) \
__all_stat_add(gendiskp, field, -subnd, sector)
#define all_stat_sub(gendiskp, field, subnd, sector) \
all_stat_add(gendiskp, field, -subnd, sector)
#define __all_stat_sub(gendiskp, part, field, subnd, sector) \
__all_stat_add(gendiskp, part, field, -subnd, sector)
#define all_stat_sub(gendiskp, part, field, subnd, sector) \
all_stat_add(gendiskp, part, field, -subnd, sector)
/* Inlines to alloc and free disk stats in struct gendisk */
#ifdef CONFIG_SMP

14
include/linux/ioprio.h
View File

@ -67,6 +67,20 @@ static inline int task_nice_ioprio(struct task_struct *task)
return (task_nice(task) + 20) / 5;
}
/*
* This is for the case where the task hasn't asked for a specific IO class.
* Check for idle and rt task process, and return appropriate IO class.
*/
static inline int task_nice_ioclass(struct task_struct *task)
{
if (task->policy == SCHED_IDLE)
return IOPRIO_CLASS_IDLE;
else if (task->policy == SCHED_FIFO || task->policy == SCHED_RR)
return IOPRIO_CLASS_RT;
else
return IOPRIO_CLASS_BE;
}
/*
* For inheritance, return the highest of the two given priorities
*/

2
kernel/relay.c
View File

@ -1191,7 +1191,7 @@ static ssize_t relay_file_splice_read(struct file *in,
ret = 0;
spliced = 0;
while (len && !spliced) {
while (len) {
ret = subbuf_splice_actor(in, ppos, pipe, len, flags, &nonpad_ret);
if (ret < 0)
break;

2
mm/filemap.c
View File

@ -1655,7 +1655,7 @@ int should_remove_suid(struct dentry *dentry)
}
EXPORT_SYMBOL(should_remove_suid);
int __remove_suid(struct dentry *dentry, int kill)
static int __remove_suid(struct dentry *dentry, int kill)
{
struct iattr newattrs;