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Merge branch 'for-2.6.39/stack-plug' into for-2.6.39/core

Browse Source 
Conflicts:
	block/blk-core.c
	block/blk-flush.c
	drivers/md/raid1.c
	drivers/md/raid10.c
	drivers/md/raid5.c
	fs/nilfs2/btnode.c
	fs/nilfs2/mdt.c

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Jens Axboe
2011-03-10 08:58:35 +01:00
parent cafb0bfca1 69d60eb96a
commit 4c63f5646e
137 changed files with 606 additions and 1533 deletions
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91
fs/btrfs/volumes.c
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@@ -162,7 +162,6 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
struct bio *cur;
int again = 0;
unsigned long num_run;
unsigned long num_sync_run;
unsigned long batch_run = 0;
unsigned long limit;
unsigned long last_waited = 0;
@@ -173,11 +172,6 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
limit = btrfs_async_submit_limit(fs_info);
limit = limit * 2 / 3;
/* we want to make sure that every time we switch from the sync
* list to the normal list, we unplug
*/
num_sync_run = 0;
loop:
spin_lock(&device->io_lock);
@@ -223,15 +217,6 @@ loop_lock:
spin_unlock(&device->io_lock);
/*
* if we're doing the regular priority list, make sure we unplug
* for any high prio bios we've sent down
*/
if (pending_bios == &device->pending_bios && num_sync_run > 0) {
num_sync_run = 0;
blk_run_backing_dev(bdi, NULL);
}
while (pending) {
rmb();
@@ -259,19 +244,11 @@ loop_lock:
BUG_ON(atomic_read(&cur->bi_cnt) == 0);
if (cur->bi_rw & REQ_SYNC)
num_sync_run++;
submit_bio(cur->bi_rw, cur);
num_run++;
batch_run++;
if (need_resched()) {
if (num_sync_run) {
blk_run_backing_dev(bdi, NULL);
num_sync_run = 0;
}
if (need_resched())
cond_resched();
}
/*
* we made progress, there is more work to do and the bdi
@@ -304,13 +281,8 @@ loop_lock:
* against it before looping
*/
last_waited = ioc->last_waited;
if (need_resched()) {
if (num_sync_run) {
blk_run_backing_dev(bdi, NULL);
num_sync_run = 0;
}
if (need_resched())
cond_resched();
}
continue;
}
spin_lock(&device->io_lock);
@@ -323,22 +295,6 @@ loop_lock:
}
}
if (num_sync_run) {
num_sync_run = 0;
blk_run_backing_dev(bdi, NULL);
}
/*
* IO has already been through a long path to get here. Checksumming,
* async helper threads, perhaps compression. We've done a pretty
* good job of collecting a batch of IO and should just unplug
* the device right away.
*
* This will help anyone who is waiting on the IO, they might have
* already unplugged, but managed to do so before the bio they
* cared about found its way down here.
*/
blk_run_backing_dev(bdi, NULL);
cond_resched();
if (again)
goto loop;
@@ -2955,7 +2911,7 @@ static int find_live_mirror(struct map_lookup *map, int first, int num,
static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
u64 logical, u64 *length,
struct btrfs_multi_bio **multi_ret,
int mirror_num, struct page *unplug_page)
int mirror_num)
{
struct extent_map *em;
struct map_lookup *map;
@@ -2987,11 +2943,6 @@ again:
em = lookup_extent_mapping(em_tree, logical, *length);
read_unlock(&em_tree->lock);
if (!em && unplug_page) {
kfree(multi);
return 0;
}
if (!em) {
printk(KERN_CRIT "unable to find logical %llu len %llu\n",
(unsigned long long)logical,
@@ -3047,13 +2998,13 @@ again:
*length = em->len - offset;
}
if (!multi_ret && !unplug_page)
if (!multi_ret)
goto out;
num_stripes = 1;
stripe_index = 0;
if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
if (unplug_page || (rw & REQ_WRITE))
if (rw & REQ_WRITE)
num_stripes = map->num_stripes;
else if (mirror_num)
stripe_index = mirror_num - 1;
@@ -3075,7 +3026,7 @@ again:
stripe_index = do_div(stripe_nr, factor);
stripe_index *= map->sub_stripes;
if (unplug_page || (rw & REQ_WRITE))
if (rw & REQ_WRITE)
num_stripes = map->sub_stripes;
else if (mirror_num)
stripe_index += mirror_num - 1;
@@ -3095,22 +3046,10 @@ again:
BUG_ON(stripe_index >= map->num_stripes);
for (i = 0; i < num_stripes; i++) {
if (unplug_page) {
struct btrfs_device *device;
struct backing_dev_info *bdi;
device = map->stripes[stripe_index].dev;
if (device->bdev) {
bdi = blk_get_backing_dev_info(device->bdev);
if (bdi->unplug_io_fn)
bdi->unplug_io_fn(bdi, unplug_page);
}
} else {
multi->stripes[i].physical =
map->stripes[stripe_index].physical +
stripe_offset + stripe_nr * map->stripe_len;
multi->stripes[i].dev = map->stripes[stripe_index].dev;
}
multi->stripes[i].physical =
map->stripes[stripe_index].physical +
stripe_offset + stripe_nr * map->stripe_len;
multi->stripes[i].dev = map->stripes[stripe_index].dev;
stripe_index++;
}
if (multi_ret) {
@@ -3128,7 +3067,7 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
struct btrfs_multi_bio **multi_ret, int mirror_num)
{
return __btrfs_map_block(map_tree, rw, logical, length, multi_ret,
mirror_num, NULL);
mirror_num);
}
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
@@ -3196,14 +3135,6 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
return 0;
}
int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
u64 logical, struct page *page)
{
u64 length = PAGE_CACHE_SIZE;
return __btrfs_map_block(map_tree, READ, logical, &length,
NULL, 0, page);
}
static void end_bio_multi_stripe(struct bio *bio, int err)
{
struct btrfs_multi_bio *multi = bio->bi_private;