On Sat, Feb 03, 2018 at 12:18:02AM +0100, Hans van Kranenburg wrote:
> On 01/26/2018 07:41 PM, Omar Sandoval wrote:
> > From: Omar Sandoval <osan...@fb.com>
> >
> > Now implemented with btrfs_util_subvolume_path(),
> > btrfs_util_subvolume_info(), and subvolume iterators.
> >
> > Signed-off-by: Omar Sandoval <osan...@fb.com>
> > ---
> > cmds-subvolume.c | 150
> > ++++++++++++++++++++++++++++++++++++-------------------
> > utils.c | 118 -------------------------------------------
> > utils.h | 5 --
> > 3 files changed, 99 insertions(+), 174 deletions(-)
> >
> > diff --git a/cmds-subvolume.c b/cmds-subvolume.c
> > index c5e03011..b969fc88 100644
> > --- a/cmds-subvolume.c
> > +++ b/cmds-subvolume.c
> >
> >
> > [...]
> > } else
> > strcpy(tstr, "-");
> > printf("\tCreation time: \t\t%s\n", tstr);
> >
> > - printf("\tSubvolume ID: \t\t%llu\n", get_ri.root_id);
> > - printf("\tGeneration: \t\t%llu\n", get_ri.gen);
> > - printf("\tGen at creation: \t%llu\n", get_ri.ogen);
> > - printf("\tParent ID: \t\t%llu\n", get_ri.ref_tree);
> > - printf("\tTop level ID: \t\t%llu\n", get_ri.top_id);
> > + printf("\tSubvolume ID: \t\t%" PRIu64 "\n", subvol.id);
> > + printf("\tGeneration: \t\t%" PRIu64 "\n", subvol.generation);
> > + printf("\tGen at creation: \t%" PRIu64 "\n", subvol.otransid);
> > + printf("\tParent ID: \t\t%" PRIu64 "\n", subvol.parent_id);
> > + printf("\tTop level ID: \t\t%" PRIu64 "\n", subvol.parent_id);
> >
> > - if (get_ri.flags & BTRFS_ROOT_SUBVOL_RDONLY)
> > + if (subvol.flags & BTRFS_ROOT_SUBVOL_RDONLY)
> > printf("\tFlags: \t\t\treadonly\n");
> > else
> > printf("\tFlags: \t\t\t-\n");
> >
> > /* print the snapshots of the given subvol if any*/
> > printf("\tSnapshot(s):\n");
> > - filter_set = btrfs_list_alloc_filter_set();
> > - btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_BY_PARENT,
> > - (u64)(unsigned long)get_ri.uuid);
> > - btrfs_list_setup_print_column(BTRFS_LIST_PATH);
> >
> > - fd = open_file_or_dir(fullpath, &dirstream1);
> > - if (fd < 0) {
> > - fprintf(stderr, "ERROR: can't access '%s'\n", fullpath);
> > - goto out;
> > + err = btrfs_util_f_create_subvolume_iterator(fd,
> > + BTRFS_FS_TREE_OBJECTID,
> > + 0, &iter);
> > +
> > [...]
> When you have enough subvolumes in a filesystem, let's say 100000 (yes,
> that sometimes happens), the current btrfs sub list is quite unusable,
> which is kind of expected. But, currently, sub show is also unusable
> because it still starts loading a list of all subvolumes to be able to
> print the 'snapshots, if any'.
>
> So I guess that this new sub show will at least print the info first and
> then use the iterator and start crawling through the list, which can be
> interrupted? At least you get the relevant info first then. :-)
Right, and since we don't load everything into memory all at once, both
show and list will be able to output subvolumes one by one.
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