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btrfs: get bdev directly from fs_devices in submit_extent_page 

This is preparatory patch to remove @bdev parameter from
submit_extent_page. It can't be removed completely, because the cgroups
need it for wbc when initializing the bio

wbc_init_bio
  bio_associate_blkg_from_css
    dereference bdev->bi_disk->queue

The bdev pointer is the same as latest_bdev, thus no functional change.
We can retrieve it from fs_devices that's reachable through several
dereferences. The local variable shadows the parameter, but that's only
temporary.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-11-18 23:27:55 +01:00
parent 3e1740993e
commit 429aebc0a9
1 changed files with 4 additions and 1 deletions
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5
fs/btrfs/extent_io.c
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@ -2987,13 +2987,16 @@ static int submit_extent_page(unsigned int opf, struct extent_io_tree *tree,
}
bio = btrfs_bio_alloc(offset);
bio_set_dev(bio, bdev);
bio_add_page(bio, page, page_size, pg_offset);
bio->bi_end_io = end_io_func;
bio->bi_private = tree;
bio->bi_write_hint = page->mapping->host->i_write_hint;
bio->bi_opf = opf;
if (wbc) {
struct block_device *bdev;
bdev = BTRFS_I(page->mapping->host)->root->fs_info->fs_devices->latest_bdev;
bio_set_dev(bio, bdev);
wbc_init_bio(wbc, bio);
wbc_account_cgroup_owner(wbc, page, page_size);
}