On 11.05.2018 03:11, Omar Sandoval wrote:
> From: Omar Sandoval <osan...@fb.com>
>
> btrfs_orphan_commit_root() tries to delete an orphan item for a
> subvolume in the tree root, but we don't actually insert that item in
> the first place. See commit 0a0d4415e338 ("Btrfs: delete dead code in
> btrfs_orphan_add()"). We can get rid of it.
>
> root->orphan_inodes was used to as a refcount for root->orphan_block_rsv
> and for btrfs_orphan_commit_root(), but both are gone now, so we can get
> rid of it, as well.
So this really means that the logic for orphaned root item is completely
defunct. Perhaps:
a) This commit should be expanded to delete all the logic surrounding
orphaned roots: btrfs_find_orphan_roots, BTRFS_ROOT_ORPHAN_ITEM_INSERTED
flag define and any accompanying logic that utilizes this flag (end of
btrfs_orphan_cleanup, orphan root logic at the end of btrfs_get_fs_root
as well)
b) Have those changes in a separate patch
>
> Signed-off-by: Omar Sandoval <osan...@fb.com>
> ---
> fs/btrfs/ctree.h | 3 ---
> fs/btrfs/disk-io.c | 1 -
> fs/btrfs/inode.c | 40 ++++------------------------------------
> fs/btrfs/transaction.c | 1 -
> 4 files changed, 4 insertions(+), 41 deletions(-)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index d66241a35fab..51408de11af2 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -1219,7 +1219,6 @@ struct btrfs_root {
> spinlock_t log_extents_lock[2];
> struct list_head logged_list[2];
>
> - atomic_t orphan_inodes;
> int orphan_cleanup_state;
>
> spinlock_t inode_lock;
> @@ -3233,8 +3232,6 @@ int btrfs_update_inode_fallback(struct
> btrfs_trans_handle *trans,
> int btrfs_orphan_add(struct btrfs_trans_handle *trans,
> struct btrfs_inode *inode);
> int btrfs_orphan_cleanup(struct btrfs_root *root);
> -void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
> - struct btrfs_root *root);
> int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
> void btrfs_invalidate_inodes(struct btrfs_root *root);
> void btrfs_add_delayed_iput(struct inode *inode);
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 24e15e2080f4..4a40bfdddabc 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -1214,7 +1214,6 @@ static void __setup_root(struct btrfs_root *root,
> struct btrfs_fs_info *fs_info,
> atomic_set(&root->log_commit[1], 0);
> atomic_set(&root->log_writers, 0);
> atomic_set(&root->log_batch, 0);
> - atomic_set(&root->orphan_inodes, 0);
> refcount_set(&root->refs, 1);
> atomic_set(&root->will_be_snapshotted, 0);
> root->log_transid = 0;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 50f10882a715..207e1d139b31 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -3292,30 +3292,6 @@ void btrfs_run_delayed_iputs(struct btrfs_fs_info
> *fs_info)
> spin_unlock(&fs_info->delayed_iput_lock);
> }
>
> -/*
> - * This is called in transaction commit time. If there are no orphan files in
> - * the subvolume, it removes the orphan item.
> - */
> -void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
> - struct btrfs_root *root)
> -{
> - struct btrfs_fs_info *fs_info = root->fs_info;
> - int ret;
> -
> - if (atomic_read(&root->orphan_inodes) == 0 &&
> - root->orphan_cleanup_state == ORPHAN_CLEANUP_DONE &&
> - test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state) &&
> - btrfs_root_refs(&root->root_item) > 0) {
> - ret = btrfs_del_orphan_item(trans, fs_info->tree_root,
> - root->root_key.objectid);
> - if (ret)
> - btrfs_abort_transaction(trans, ret);
> - else
> - clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
> - &root->state);
> - }
> -}
> -
> /*
> * This creates an orphan entry for the given inode in case something goes
> wrong
> * in the middle of an unlink.
> @@ -3330,11 +3306,8 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans,
> &inode->runtime_flags))
> return 0;
>
> - atomic_inc(&root->orphan_inodes);
> -
> ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode));
> if (ret && ret != -EEXIST) {
> - atomic_dec(&root->orphan_inodes);
> clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, &inode->runtime_flags);
> btrfs_abort_transaction(trans, ret);
> return ret;
> @@ -3360,8 +3333,6 @@ static int btrfs_orphan_del(struct btrfs_trans_handle
> *trans,
> if (trans)
> ret = btrfs_del_orphan_item(trans, root, btrfs_ino(inode));
>
> - atomic_dec(&root->orphan_inodes);
> -
> return ret;
> }
>
> @@ -3519,12 +3490,11 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
> }
>
> /*
> - * add this inode to the orphan list so btrfs_orphan_del does
> - * the proper thing when we hit it
> + * Mark this inode as having an orphan item so
> + * btrfs_orphan_del() does the proper thing when we hit it.
> */
> set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
> &BTRFS_I(inode)->runtime_flags);
> - atomic_inc(&root->orphan_inodes);
>
> nr_unlink++;
>
> @@ -9146,11 +9116,9 @@ void btrfs_destroy_inode(struct inode *inode)
> goto free;
>
> if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
> - &BTRFS_I(inode)->runtime_flags)) {
> - btrfs_info(fs_info, "inode %llu still on the orphan list",
> + &BTRFS_I(inode)->runtime_flags))
> + btrfs_info(fs_info, "inode %llu still has an orphan item",
> btrfs_ino(BTRFS_I(inode)));
> - atomic_dec(&root->orphan_inodes);
> - }
>
> while (1) {
> ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
> diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
> index c944b4769e3c..44af1edf15d1 100644
> --- a/fs/btrfs/transaction.c
> +++ b/fs/btrfs/transaction.c
> @@ -1250,7 +1250,6 @@ static noinline int commit_fs_roots(struct
> btrfs_trans_handle *trans)
>
> btrfs_free_log(trans, root);
> btrfs_update_reloc_root(trans, root);
> - btrfs_orphan_commit_root(trans, root);
>
> btrfs_save_ino_cache(root, trans);
>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
