On 2018年03月03日 02:47, je...@suse.com wrote:
> From: Jeff Mahoney <je...@suse.com>
>
> The only mechanism we have in the progs for searching qgroups is to load
> all of them and filter the results. This works for qgroup show but
> to add quota information to 'btrfs subvoluem show' it's pretty wasteful.
>
> This patch splits out setting up the search and performing the search so
> we can search for a single qgroupid more easily.
>
> Signed-off-by: Jeff Mahoney <je...@suse.com>
> ---
> qgroup.c | 98
> +++++++++++++++++++++++++++++++++++++++++++++-------------------
> qgroup.h | 7 +++++
> 2 files changed, 77 insertions(+), 28 deletions(-)
>
> diff --git a/qgroup.c b/qgroup.c
> index b1be3311..2d0a6947 100644
> --- a/qgroup.c
> +++ b/qgroup.c
> @@ -1146,11 +1146,11 @@ static inline void print_status_flag_warning(u64
> flags)
> warning("qgroup data inconsistent, rescan recommended");
> }
>
> -static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup)
> +static int __qgroups_search(int fd, struct btrfs_ioctl_search_args *args,
> + struct qgroup_lookup *qgroup_lookup)
> {
> int ret;
> - struct btrfs_ioctl_search_args args;
> - struct btrfs_ioctl_search_key *sk = &args.key;
> + struct btrfs_ioctl_search_key *sk = &args->key;
> struct btrfs_ioctl_search_header *sh;
> unsigned long off = 0;
> unsigned int i;
> @@ -1161,30 +1161,12 @@ static int __qgroups_search(int fd, struct
> qgroup_lookup *qgroup_lookup)
> u64 qgroupid;
> u64 qgroupid1;
>
> - memset(&args, 0, sizeof(args));
> -
> - sk->tree_id = BTRFS_QUOTA_TREE_OBJECTID;
> - sk->max_type = BTRFS_QGROUP_RELATION_KEY;
> - sk->min_type = BTRFS_QGROUP_STATUS_KEY;
> - sk->max_objectid = (u64)-1;
> - sk->max_offset = (u64)-1;
> - sk->max_transid = (u64)-1;
> - sk->nr_items = 4096;
> -
> qgroup_lookup_init(qgroup_lookup);
>
> while (1) {
> - ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
> + ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, args);
> if (ret < 0) {
> - if (errno == ENOENT) {
> - error("can't list qgroups: quotas not enabled");
> - ret = -ENOTTY;
> - } else {
> - error("can't list qgroups: %s",
> - strerror(errno));
> - ret = -errno;
> - }
> -
> + ret = -errno;
> break;
> }
>
> @@ -1198,14 +1180,14 @@ static int __qgroups_search(int fd, struct
> qgroup_lookup *qgroup_lookup)
> * read the root_ref item it contains
> */
> for (i = 0; i < sk->nr_items; i++) {
> - sh = (struct btrfs_ioctl_search_header *)(args.buf +
> + sh = (struct btrfs_ioctl_search_header *)(args->buf +
> off);
> off += sizeof(*sh);
>
> switch (btrfs_search_header_type(sh)) {
> case BTRFS_QGROUP_STATUS_KEY:
> si = (struct btrfs_qgroup_status_item *)
> - (args.buf + off);
> + (args->buf + off);
> flags = btrfs_stack_qgroup_status_flags(si);
>
> print_status_flag_warning(flags);
> @@ -1213,7 +1195,7 @@ static int __qgroups_search(int fd, struct
> qgroup_lookup *qgroup_lookup)
> case BTRFS_QGROUP_INFO_KEY:
> qgroupid = btrfs_search_header_offset(sh);
> info = (struct btrfs_qgroup_info_item *)
> - (args.buf + off);
> + (args->buf + off);
>
> ret = update_qgroup_info(fd, qgroup_lookup,
> qgroupid, info);
> @@ -1221,7 +1203,7 @@ static int __qgroups_search(int fd, struct
> qgroup_lookup *qgroup_lookup)
> case BTRFS_QGROUP_LIMIT_KEY:
> qgroupid = btrfs_search_header_offset(sh);
> limit = (struct btrfs_qgroup_limit_item *)
> - (args.buf + off);
> + (args->buf + off);
>
> ret = update_qgroup_limit(fd, qgroup_lookup,
> qgroupid, limit);
> @@ -1267,6 +1249,66 @@ static int __qgroups_search(int fd, struct
> qgroup_lookup *qgroup_lookup)
> return ret;
> }
>
> +static int qgroups_search_all(int fd, struct qgroup_lookup *qgroup_lookup)
> +{
> + struct btrfs_ioctl_search_args args = {
> + .key = {
> + .tree_id = BTRFS_QUOTA_TREE_OBJECTID,
> + .max_type = BTRFS_QGROUP_RELATION_KEY,
> + .min_type = BTRFS_QGROUP_STATUS_KEY,
> + .max_objectid = (u64)-1,
> + .max_offset = (u64)-1,
> + .max_transid = (u64)-1,
> + .nr_items = 4096,
> + },
> + };
> + int ret;
> +
> + ret = __qgroups_search(fd, &args, qgroup_lookup);
> + if (ret == -ENOTTY)
> + error("can't list qgroups: quotas not enabled");
> + else if (ret < 0)
> + error("can't list qgroups: %s", strerror(-ret));
> + return ret;
> +}
> +
> +int btrfs_qgroup_query(int fd, u64 qgroupid, struct btrfs_qgroup_stats
> *stats)
> +{
> + struct btrfs_ioctl_search_args args = {
> + .key = {
> + .tree_id = BTRFS_QUOTA_TREE_OBJECTID,
> + .min_type = BTRFS_QGROUP_INFO_KEY,
> + .max_type = BTRFS_QGROUP_LIMIT_KEY,
> + .max_objectid = 0,
> + .max_offset = qgroupid,
> + .max_transid = (u64)-1,
> + .nr_items = 4096, /* should be 2, i think */
2 is not correct in fact.
As QGROUP_INFO is smaller than QGROUP_LIMIT, to get a slice of all what
we need, we need to include all other unrelated items.
One example will be:
item 1 key (0 QGROUP_INFO 0/5) itemoff 16211 itemsize 40
item 2 key (0 QGROUP_INFO 0/257) itemoff 16171 itemsize 40
item 3 key (0 QGROUP_INFO 1/1) itemoff 16131 itemsize 40
item 4 key (0 QGROUP_LIMIT 0/5) itemoff 16091 itemsize 40
item 5 key (0 QGROUP_LIMIT 0/257) itemoff 16051 itemsize 40
item 6 key (0 QGROUP_LIMIT 1/1) itemoff 16011 itemsize 40
To query qgroup info about 0/257, above setup will get the following slice:
item 1 key (0 QGROUP_INFO 0/5) itemoff 16211 itemsize 40
item 2 key (0 QGROUP_INFO 0/257) itemoff 16171 itemsize 40
item 3 key (0 QGROUP_INFO 1/1) itemoff 16131 itemsize 40
item 4 key (0 QGROUP_LIMIT 0/5) itemoff 16091 itemsize 40
item 5 key (0 QGROUP_LIMIT 0/257) itemoff 16051 itemsize 40
So we still need that large @nr_items.
Despite this comment it looks good.
Thanks,
Qu
> + },
> + };
> + struct qgroup_lookup qgroup_lookup;
> + struct btrfs_qgroup *qgroup;
> + struct rb_node *n;
> + int ret;
> +
> + ret = __qgroups_search(fd, &args, &qgroup_lookup);
> + if (ret < 0)
> + return ret;
> +
> + ret = -ENODATA;
> + n = rb_first(&qgroup_lookup.root);
> + if (n) {
> + qgroup = rb_entry(n, struct btrfs_qgroup, rb_node);
> + stats->qgroupid = qgroup->qgroupid;
> + stats->info = qgroup->info;
> + stats->limit = qgroup->limit;
> +
> + ret = 0;
> + }
> +
> + __free_all_qgroups(&qgroup_lookup);
> + return ret;
> +}
> +
> static void print_all_qgroups(struct qgroup_lookup *qgroup_lookup, bool
> verbose)
> {
>
> @@ -1293,7 +1335,7 @@ int btrfs_show_qgroups(int fd,
> struct qgroup_lookup sort_tree;
> int ret;
>
> - ret = __qgroups_search(fd, &qgroup_lookup);
> + ret = qgroups_search_all(fd, &qgroup_lookup);
> if (ret)
> return ret;
> __filter_and_sort_qgroups(&qgroup_lookup, &sort_tree,
> diff --git a/qgroup.h b/qgroup.h
> index 5e71349c..688f92b2 100644
> --- a/qgroup.h
> +++ b/qgroup.h
> @@ -87,6 +87,12 @@ struct btrfs_qgroup_info {
> u64 exclusive_compressed;
> };
>
> +struct btrfs_qgroup_stats {
> + u64 qgroupid;
> + struct btrfs_qgroup_info info;
> + struct btrfs_qgroup_limit limit;
> +};
> +
> int btrfs_qgroup_parse_sort_string(const char *opt_arg,
> struct btrfs_qgroup_comparer_set **comps);
> int btrfs_show_qgroups(int fd, struct btrfs_qgroup_filter_set *,
> @@ -105,4 +111,5 @@ int qgroup_inherit_add_group(struct btrfs_qgroup_inherit
> **inherit, char *arg);
> int qgroup_inherit_add_copy(struct btrfs_qgroup_inherit **inherit, char *arg,
> int type);
>
> +int btrfs_qgroup_query(int fd, u64 qgroupid, struct btrfs_qgroup_stats
> *stats);
> #endif
>
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