btrfs: remove btrfs_bio::fs_info by extracting it from btrfs_bio::inode

Currently there is only one caller which doesn't populate
btrfs_bio::inode, and that's scrub.

The idea is scrub doesn't want any automatic csum verification nor
read-repair, as everything will be handled by scrub itself.

However that behavior is really no different than metadata inode, thus
we can reuse btree_inode as btrfs_bio::inode for scrub.

The only exception is in btrfs_submit_chunk() where if a bbio is from
scrub or data reloc inode, we set rst_search_commit_root to true.
This means we still need a way to distinguish scrub from metadata, but
that can be done by a new flag inside btrfs_bio.

Now btrfs_bio::inode is a mandatory parameter, we can extract fs_info
from that inode thus can remove btrfs_bio::fs_info to save 8 bytes from
btrfs_bio structure.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index bacad18357b3..8c3899832a1a 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -67,9 +67,7 @@ static struct compressed_bio *alloc_compressed_bio(struct btrfs_inode *inode,
 
 	bbio = btrfs_bio(bio_alloc_bioset(NULL, BTRFS_MAX_COMPRESSED_PAGES, op,
 					  GFP_NOFS, &btrfs_compressed_bioset));
-	btrfs_bio_init(bbio, inode->root->fs_info, end_io, NULL);
-	bbio->inode = inode;
-	bbio->file_offset = start;
+	btrfs_bio_init(bbio, inode, start, end_io, NULL);
 	return to_compressed_bio(bbio);
 }
 
@@ -354,7 +352,7 @@ static void end_bbio_compressed_write(struct btrfs_bio *bbio)
 
 static void btrfs_add_compressed_bio_folios(struct compressed_bio *cb)
 {
-	struct btrfs_fs_info *fs_info = cb->bbio.fs_info;
+	struct btrfs_fs_info *fs_info = cb->bbio.inode->root->fs_info;
 	struct bio *bio = &cb->bbio.bio;
 	u32 offset = 0;