Signed-off-by: Kent Overstreet <[email protected]>
---
fs/bcachefs/disk_accounting_format.h | 54 +++++++++++++++++++++++++++-
1 file changed, 53 insertions(+), 1 deletion(-)
diff --git a/fs/bcachefs/disk_accounting_format.h
b/fs/bcachefs/disk_accounting_format.h
index 09198ffb57b1..8269af1dbe2a 100644
--- a/fs/bcachefs/disk_accounting_format.h
+++ b/fs/bcachefs/disk_accounting_format.h
@@ -119,22 +119,57 @@ enum disk_accounting_type {
BCH_DISK_ACCOUNTING_TYPE_NR,
};
+/*
+ * No subtypes - number of inodes in the entire filesystem
+ *
+ * XXX: perhaps we could add a per-subvolume counter?
+ */
struct bch_acct_nr_inodes {
};
+/*
+ * Tracks KEY_TYPE_reservation sectors, broken out by number of replicas for
the
+ * reservation:
+ */
struct bch_acct_persistent_reserved {
__u8 nr_replicas;
};
+/*
+ * device, data type counter fields:
+ * [
+ * nr_buckets
+ * live sectors (in buckets of that data type)
+ * sectors of internal fragmentation
+ * ]
+ *
+ * XXX: live sectors should've been done differently, you can have multiple
data
+ * types in the same bucket (user, stripe, cached) and this collapses them to
+ * the bucket data type, and makes the internal fragmentation counter redundant
+ */
struct bch_acct_dev_data_type {
__u8 dev;
__u8 data_type;
};
+/*
+ * Compression type fields:
+ * [
+ * number of extents
+ * uncompressed size
+ * compressed size
+ * ]
+ *
+ * Compression ratio, average extent size (fragmentation).
+ */
struct bch_acct_compression {
__u8 type;
};
+/*
+ * On disk usage by snapshot id; counts same values as replicas counter, but
+ * aggregated differently
+ */
struct bch_acct_snapshot {
__u32 id;
} __packed;
@@ -143,10 +178,27 @@ struct bch_acct_btree {
__u32 id;
} __packed;
+/*
+ * inum counter fields:
+ * [
+ * number of extents
+ * sum of extent sizes - bkey size
+ * this field is similar to inode.bi_sectors, except here extents in
+ * different snapshots but the same inode number are all collapsed to the
+ * same counter
+ * sum of on disk size - same values tracked by replicas counters
+ * ]
+ *
+ * This tracks on disk fragmentation.
+ */
struct bch_acct_inum {
__u64 inum;
} __packed;
+/*
+ * Simple counter of the amount of data (on disk sectors) rebalance needs to
+ * move, extents counted here are also in the rebalance_work btree.
+ */
struct bch_acct_rebalance_work {
};
@@ -155,7 +207,7 @@ struct disk_accounting_pos {
struct {
__u8 type;
union {
- struct bch_acct_nr_inodes nr_inodes;
+ struct bch_acct_nr_inodes nr_inodes;
struct bch_acct_persistent_reserved persistent_reserved;
struct bch_replicas_entry_v1 replicas;
struct bch_acct_dev_data_type dev_data_type;
--
2.49.0
