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authorAndi Kleen <ak@linux.intel.com>2012-01-12 17:20:34 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-12 20:13:12 -0800
commit87192a2a49c475cf322cb143e0fa63b0102d8567 (patch)
tree70acf2fb1e4a9a3a62559ad9218278d2fb114599 /fs/block_dev.c
parentae55e1aaa7e2e57e538cb98cf617f511c5dc4f73 (diff)
downloadop-kernel-dev-87192a2a49c475cf322cb143e0fa63b0102d8567.zip
op-kernel-dev-87192a2a49c475cf322cb143e0fa63b0102d8567.tar.gz
vfs: cache request_queue in struct block_device
This makes it possible to get from the inode to the request_queue with one less cache miss. Used in followon optimization. The livetime of the pointer is the same as the gendisk. This assumes that the queue will always stay the same in the gendisk while it's visible to block_devices. I think that's safe correct? Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index afe74dd..0e575d1 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1139,6 +1139,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
mutex_lock_nested(&bdev->bd_mutex, for_part);
if (!bdev->bd_openers) {
bdev->bd_disk = disk;
+ bdev->bd_queue = disk->queue;
bdev->bd_contains = bdev;
if (!partno) {
struct backing_dev_info *bdi;
@@ -1159,6 +1160,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
bdev->bd_disk = NULL;
+ bdev->bd_queue = NULL;
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
put_disk(disk);
@@ -1232,6 +1234,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
disk_put_part(bdev->bd_part);
bdev->bd_disk = NULL;
bdev->bd_part = NULL;
+ bdev->bd_queue = NULL;
bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info);
if (bdev != bdev->bd_contains)
__blkdev_put(bdev->bd_contains, mode, 1);
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