Add new subcommand to btrfs inspect-internal
btrfs inspect-internal balance_check <path>
Checks whether 'btrfs balance' can help creating more space (Only
considers data block groups).
Signed-off-by: Divya Indi <divya.indi@xxxxxxxxxx>
Reviewed-by: Ashish Samant <ashish.samant@xxxxxxxxxx>
Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
---
cmds-inspect.c | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 147 insertions(+), 0 deletions(-)
diff --git a/cmds-inspect.c b/cmds-inspect.c
index 0e2f15a..5baaa49 100644
--- a/cmds-inspect.c
+++ b/cmds-inspect.c
@@ -267,6 +267,151 @@ static const char * const cmd_inspect_inode_resolve_usage[] = {
NULL
};
+static const char * const cmd_inspect_balance_check_usage[] = {
+ "btrfs inspect-internal balance_check <path>",
+ "To check whether 'btrfs balance' can help creating more space",
+ "",
+ "",
+ NULL
+};
+
+static int cmd_inspect_balance_check(int argc, char **argv)
+{
+ struct btrfs_ioctl_search_args args;
+ struct btrfs_ioctl_search_args bg_args;
+ struct btrfs_ioctl_search_key *sk;
+ struct btrfs_ioctl_search_key *bg_sk;
+ struct btrfs_ioctl_search_header *header;
+ struct btrfs_ioctl_search_header *bg_header;
+ struct btrfs_block_group_item *bg;
+ struct btrfs_chunk *chunk;
+ unsigned long off = 0;
+ unsigned long bg_off = 0;
+ DIR *dirstream = NULL;
+ int fd;
+ int i;
+ u64 total_free = 0;
+ u64 min_used = (u64)-1;
+ u64 free_of_min_used = 0;
+ u64 bg_of_min_used = 0;
+ u64 flags;
+ u64 used;
+ int ret = 0;
+ int nr_data_bgs = 0;
+
+ if (check_argc_exact(argc, 2))
+ usage(cmd_inspect_balance_check_usage);
+
+ fd = btrfs_open_dir(argv[optind], &dirstream, 1);
+ if (fd < 0)
+ return 1;
+
+ memset(&args, 0, sizeof(args));
+ sk = &args.key;
+ sk->min_offset = sk->min_transid = 0;
+ sk->max_offset = sk->max_transid = (u64)-1;
+
+ printf("%20s%20s%20s\n", "Start", "Len", "Used");
+ while (1) {
+ ret = get_chunks(fd, &args);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * it should not happen.
+ */
+ if (sk->nr_items == 0)
+ break;
+
+ off = 0;
+ memset(&bg_args, 0, sizeof(bg_args));
+ bg_sk = &bg_args.key;
+
+ /* For every chunk, look up 1 exact match for block group in
+ * the extent tree. */
+ bg_sk->tree_id = BTRFS_EXTENT_TREE_OBJECTID;
+ bg_sk->min_type = BTRFS_BLOCK_GROUP_ITEM_KEY;
+ bg_sk->max_type = BTRFS_BLOCK_GROUP_ITEM_KEY;
+ bg_sk->min_transid = 0;
+ bg_sk->max_transid = (u64)-1;
+
+ for (i = 0; i < sk->nr_items; i++) {
+ header = (struct btrfs_ioctl_search_header *)(args.buf
+ + off);
+ off += sizeof(*header);
+ if (header->type == BTRFS_CHUNK_ITEM_KEY) {
+ chunk = (struct btrfs_chunk *)
+ (args.buf + off);
+ ret = get_bg_info(fd, &bg_args, header->offset,
+ chunk->length);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * it should not happen.
+ */
+ if (bg_sk->nr_items == 0)
+ continue;
+
+ bg_off = 0;
+ bg_header = (struct btrfs_ioctl_search_header *)
+ (bg_args.buf + bg_off);
+ bg_off += sizeof(*bg_header);
+ bg = (struct btrfs_block_group_item *)
+ (bg_args.buf + bg_off);
+
+ flags = btrfs_block_group_flags(bg);
+ if (flags & BTRFS_BLOCK_GROUP_DATA) {
+ used = btrfs_block_group_used(bg);
+ nr_data_bgs++;
+ printf("%20llu%20s%20s\n",
+ bg_header->objectid,
+ pretty_size(bg_header->offset),
+ pretty_size(used));
+ total_free += bg_header->offset - used;
+ if (min_used >= used) {
+ min_used = used;
+ free_of_min_used =
+ bg_header->offset - used;
+ bg_of_min_used =
+ bg_header->objectid;
+ }
+ }
+ }
+
+ off += header->len;
+ sk->min_offset = header->offset + header->len;
+ }
+ sk->nr_items = 4096;
+
+ }
+
+ if (nr_data_bgs <= 1) {
+ printf("Data block groups in fs = %d, no need to do balance.\n",
+ nr_data_bgs);
+ ret = 1;
+ goto out;
+ }
+
+ printf("Total data bgs: %d\nTotal free space: %s\n"
+ "For min used bg %llu used = %s free = %s\n",
+ nr_data_bgs, pretty_size(total_free), bg_of_min_used,
+ pretty_size(min_used), pretty_size(free_of_min_used));
+
+ if (total_free - free_of_min_used > min_used) {
+ printf("run 'btrfs balance start -dvrange=%llu..%llu <mountpoint>'\n",
+ bg_of_min_used, bg_of_min_used + 1);
+ ret = 0;
+ } else {
+ printf("Please don't balance data block groups, no free space\n");
+ ret = 1;
+ }
+
+out:
+ close_file_or_dir(fd, dirstream);
+ return ret;
+}
+
static int cmd_inspect_inode_resolve(int argc, char **argv)
{
int fd;
@@ -816,6 +961,8 @@ const struct cmd_group inspect_cmd_group = {
cmd_inspect_min_dev_size_usage, NULL, 0 },
{ "bg_analysis", cmd_inspect_bg_analysis,
cmd_inspect_bg_analysis_usage, NULL, 0 },
+ { "balance_check", cmd_inspect_balance_check,
+ cmd_inspect_balance_check_usage, NULL, 0 },
{ "dump-tree", cmd_inspect_dump_tree,
cmd_inspect_dump_tree_usage, NULL, 0 },
{ "dump-super", cmd_inspect_dump_super,
--
1.7.1
--
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