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bcachefs: Document disk accounting keys and conuters

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-03-25 10:28:53 -04:00
parent 9c893face2
commit a44e4f8f00
1 changed files with 53 additions and 1 deletions
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54
fs/bcachefs/disk_accounting_format.h
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@ -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;