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Btrfs: Make an unplug function that doesn't unplug every spindle

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-21 10:03:05 -04:00
parent 4ef64eae28
commit f2d8d74d78
4 changed files with 75 additions and 38 deletions
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26
fs/btrfs/disk-io.c
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@@ -913,18 +913,22 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
{
struct list_head *cur;
struct btrfs_device *device;
struct btrfs_fs_info *info;
struct inode *inode = page->mapping->host;
struct extent_map_tree *em_tree;
struct extent_map *em;
u64 offset = page_offset(page);
info = (struct btrfs_fs_info *)bdi->unplug_io_data;
list_for_each(cur, &info->fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
bdi = blk_get_backing_dev_info(device->bdev);
if (bdi->unplug_io_fn) {
bdi->unplug_io_fn(bdi, page);
}
}
em_tree = &BTRFS_I(inode)->extent_tree;
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
spin_unlock(&em_tree->lock);
if (!em)
return;
offset = offset - em->start;
btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
em->block_start + offset, page);
free_extent_map(em);
}
static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)