On Fri, May 11, 2018 at 09:44:36AM +0300, Nikolay Borisov wrote:
>
>
> On 11.05.2018 03:11, Omar Sandoval wrote:
> > From: Omar Sandoval <osan...@fb.com>
> >
> > Now that we don't keep long-standing reservations for orphan items,
> > root->orphan_block_rsv isn't used. We can git rid of it and
> > root->orphan_lock, which was used to protect it.
> >
> > Signed-off-by: Omar Sandoval <osan...@fb.com>
> > ---
> > fs/btrfs/ctree.h | 5 -----
> > fs/btrfs/disk-io.c | 8 --------
> > fs/btrfs/extent-tree.c | 38 --------------------------------------
> > fs/btrfs/inode.c | 41 ++++++-----------------------------------
> > 4 files changed, 6 insertions(+), 86 deletions(-)
> >
> > diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> > index 2771cc56a622..d66241a35fab 100644
> > --- a/fs/btrfs/ctree.h
> > +++ b/fs/btrfs/ctree.h
> > @@ -1219,9 +1219,7 @@ struct btrfs_root {
> > spinlock_t log_extents_lock[2];
> > struct list_head logged_list[2];
> >
> > - spinlock_t orphan_lock;
> > atomic_t orphan_inodes;
> > - struct btrfs_block_rsv *orphan_block_rsv;
> > int orphan_cleanup_state;
> >
> > spinlock_t inode_lock;
> > @@ -2764,9 +2762,6 @@ void btrfs_delalloc_release_space(struct inode *inode,
> > void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
> > u64 len);
> > void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
> > -int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
> > - struct btrfs_inode *inode);
> > -void btrfs_orphan_release_metadata(struct btrfs_inode *inode);
> > int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
> > struct btrfs_block_rsv *rsv,
> > int nitems,
> > diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> > index 60caa68c3618..24e15e2080f4 100644
> > --- a/fs/btrfs/disk-io.c
> > +++ b/fs/btrfs/disk-io.c
> > @@ -1185,7 +1185,6 @@ static void __setup_root(struct btrfs_root *root,
> > struct btrfs_fs_info *fs_info,
> > root->inode_tree = RB_ROOT;
> > INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
> > root->block_rsv = NULL;
> > - root->orphan_block_rsv = NULL;
> >
> > INIT_LIST_HEAD(&root->dirty_list);
> > INIT_LIST_HEAD(&root->root_list);
> > @@ -1195,7 +1194,6 @@ static void __setup_root(struct btrfs_root *root,
> > struct btrfs_fs_info *fs_info,
> > INIT_LIST_HEAD(&root->ordered_root);
> > INIT_LIST_HEAD(&root->logged_list[0]);
> > INIT_LIST_HEAD(&root->logged_list[1]);
> > - spin_lock_init(&root->orphan_lock);
> > spin_lock_init(&root->inode_lock);
> > spin_lock_init(&root->delalloc_lock);
> > spin_lock_init(&root->ordered_extent_lock);
> > @@ -3674,8 +3672,6 @@ static void free_fs_root(struct btrfs_root *root)
> > {
> > iput(root->ino_cache_inode);
> > WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
> > - btrfs_free_block_rsv(root->fs_info, root->orphan_block_rsv);
> > - root->orphan_block_rsv = NULL;
> > if (root->anon_dev)
> > free_anon_bdev(root->anon_dev);
> > if (root->subv_writers)
> > @@ -3766,7 +3762,6 @@ int btrfs_commit_super(struct btrfs_fs_info *fs_info)
> >
> > void close_ctree(struct btrfs_fs_info *fs_info)
> > {
> > - struct btrfs_root *root = fs_info->tree_root;
> > int ret;
> >
> > set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
> > @@ -3861,9 +3856,6 @@ void close_ctree(struct btrfs_fs_info *fs_info)
> > btrfs_free_stripe_hash_table(fs_info);
> > btrfs_free_ref_cache(fs_info);
> >
> > - __btrfs_free_block_rsv(root->orphan_block_rsv);
> > - root->orphan_block_rsv = NULL;
> > -
> > while (!list_empty(&fs_info->pinned_chunks)) {
> > struct extent_map *em;
> >
> > diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> > index 51b5e2da708c..3f2e026bc206 100644
> > --- a/fs/btrfs/extent-tree.c
> > +++ b/fs/btrfs/extent-tree.c
> > @@ -5949,44 +5949,6 @@ void btrfs_trans_release_chunk_metadata(struct
> > btrfs_trans_handle *trans)
> > trans->chunk_bytes_reserved = 0;
> > }
> >
> > -/* Can only return 0 or -ENOSPC */
> > -int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
> > - struct btrfs_inode *inode)
> > -{
> > - struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
> > - struct btrfs_root *root = inode->root;
> > - /*
> > - * We always use trans->block_rsv here as we will have reserved space
> > - * for our orphan when starting the transaction, using get_block_rsv()
> > - * here will sometimes make us choose the wrong block rsv as we could be
> > - * doing a reloc inode for a non refcounted root.
> > - */
> > - struct btrfs_block_rsv *src_rsv = trans->block_rsv;
> > - struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv;
> > -
> > - /*
> > - * We need to hold space in order to delete our orphan item once we've
> > - * added it, so this takes the reservation so we can release it later
> > - * when we are truly done with the orphan item.
> > - */
> > - u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
> > -
> > - trace_btrfs_space_reservation(fs_info, "orphan", btrfs_ino(inode),
> > - num_bytes, 1);
> > - return btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);
> > -}
> > -
> > -void btrfs_orphan_release_metadata(struct btrfs_inode *inode)
> > -{
> > - struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
> > - struct btrfs_root *root = inode->root;
> > - u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
> > -
> > - trace_btrfs_space_reservation(fs_info, "orphan", btrfs_ino(inode),
> > - num_bytes, 0);
> > - btrfs_block_rsv_release(fs_info, root->orphan_block_rsv, num_bytes);
> > -}
> > -
> > /*
> > * btrfs_subvolume_reserve_metadata() - reserve space for subvolume
> > operation
> > * root: the root of the parent directory
> > diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> > index b9a046b8c72c..50f10882a715 100644
> > --- a/fs/btrfs/inode.c
> > +++ b/fs/btrfs/inode.c
> > @@ -3293,37 +3293,18 @@ void btrfs_run_delayed_iputs(struct btrfs_fs_info
> > *fs_info)
> > }
> >
> > /*
> > - * This is called in transaction commit time. If there are no orphan
> > - * files in the subvolume, it removes orphan item and frees block_rsv
> > - * structure.
> > + * This is called in transaction commit time. If there are no orphan files
> > in
> ^^
> nit: s/in/at
> > + * the subvolume, it removes the orphan item.
> > */
> > void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
> > struct btrfs_root *root)
> > {
>
> This function is called only in transaction.c, why not unexport it and
> move it to transaction.c?
It goes away entirely in the next patch :)
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