2017-03-17 06:18:50 +00:00
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_ALLOC_TYPES_H
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#define _BCACHEFS_ALLOC_TYPES_H
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include "clock_types.h"
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#include "fifo.h"
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2022-11-04 20:06:55 +00:00
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struct bucket_alloc_state {
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u64 buckets_seen;
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u64 skipped_open;
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u64 skipped_need_journal_commit;
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bcachefs: Nocow support
This adds support for nocow mode, where we do writes in-place when
possible. Patch components:
- New boolean filesystem and inode option, nocow: note that when nocow
is enabled, data checksumming and compression are implicitly disabled
- To prevent in-place writes from racing with data moves
(data_update.c) or bucket reuse (i.e. a bucket being reused and
re-allocated while a nocow write is in flight, we have a new locking
mechanism.
Buckets can be locked for either data update or data move, using a
fixed size hash table of two_state_shared locks. We don't have any
chaining, meaning updates and moves to different buckets that hash to
the same lock will wait unnecessarily - we'll want to watch for this
becoming an issue.
- The allocator path also needs to check for in-place writes in flight
to a given bucket before giving it out: thus we add another counter
to bucket_alloc_state so we can track this.
- Fsync now may need to issue cache flushes to block devices instead of
flushing the journal. We add a device bitmask to bch_inode_info,
ei_devs_need_flush, which tracks devices that need to have flushes
issued - note that this will lead to unnecessary flushes when other
codepaths have already issued flushes, we may want to replace this with
a sequence number.
- New nocow write path: look up extents, and if they're writable write
to them - otherwise fall back to the normal COW write path.
XXX: switch to sequence numbers instead of bitmask for devs needing
journal flush
XXX: ei_quota_lock being a mutex means bch2_nocow_write_done() needs to
run in process context - see if we can improve this
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2022-11-02 21:12:00 +00:00
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u64 skipped_nocow;
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2022-11-04 20:06:55 +00:00
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u64 skipped_nouse;
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};
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2018-11-01 19:13:19 +00:00
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struct ec_bucket_buf;
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2022-03-13 23:27:55 +00:00
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#define BCH_ALLOC_RESERVES() \
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x(btree_movinggc) \
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x(btree) \
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x(movinggc) \
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x(none)
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2017-03-17 06:18:50 +00:00
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enum alloc_reserve {
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2022-03-13 23:27:55 +00:00
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#define x(name) RESERVE_##name,
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BCH_ALLOC_RESERVES()
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#undef x
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2017-03-17 06:18:50 +00:00
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};
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2020-06-09 19:44:03 +00:00
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#define OPEN_BUCKETS_COUNT 1024
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2018-11-05 02:55:35 +00:00
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#define WRITE_POINT_HASH_NR 32
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#define WRITE_POINT_MAX 32
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2017-03-17 06:18:50 +00:00
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2021-12-26 02:43:29 +00:00
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/*
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* 0 is never a valid open_bucket_idx_t:
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*/
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2020-06-09 19:44:03 +00:00
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typedef u16 open_bucket_idx_t;
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2017-03-17 06:18:50 +00:00
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struct open_bucket {
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spinlock_t lock;
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atomic_t pin;
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2020-06-09 19:44:03 +00:00
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open_bucket_idx_t freelist;
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2021-12-26 02:43:29 +00:00
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open_bucket_idx_t hash;
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2020-06-09 19:44:03 +00:00
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/*
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* When an open bucket has an ec_stripe attached, this is the index of
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* the block in the stripe this open_bucket corresponds to:
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*/
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2018-11-01 19:13:19 +00:00
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u8 ec_idx;
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2022-04-01 05:29:59 +00:00
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enum bch_data_type data_type:8;
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2019-01-19 18:13:29 +00:00
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unsigned valid:1;
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unsigned on_partial_list:1;
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2022-04-01 05:29:59 +00:00
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unsigned alloc_reserve:3;
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2021-12-26 02:21:46 +00:00
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u8 dev;
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u8 gen;
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2022-04-01 05:29:59 +00:00
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u32 sectors_free;
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2021-12-26 02:21:46 +00:00
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u64 bucket;
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2018-11-01 19:13:19 +00:00
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struct ec_stripe_new *ec;
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2017-03-17 06:18:50 +00:00
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};
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2018-10-06 08:12:42 +00:00
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#define OPEN_BUCKET_LIST_MAX 15
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struct open_buckets {
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2020-06-09 19:44:03 +00:00
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open_bucket_idx_t nr;
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open_bucket_idx_t v[OPEN_BUCKET_LIST_MAX];
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2018-10-06 08:12:42 +00:00
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};
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2018-11-01 19:13:19 +00:00
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struct dev_stripe_state {
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u64 next_alloc[BCH_SB_MEMBERS_MAX];
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};
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2022-10-31 20:13:05 +00:00
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#define WRITE_POINT_STATES() \
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x(stopped) \
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x(waiting_io) \
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x(waiting_work) \
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x(running)
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enum write_point_state {
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#define x(n) WRITE_POINT_##n,
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WRITE_POINT_STATES()
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#undef x
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WRITE_POINT_STATE_NR
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};
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2017-03-17 06:18:50 +00:00
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struct write_point {
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2022-10-31 20:13:05 +00:00
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struct {
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struct hlist_node node;
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struct mutex lock;
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u64 last_used;
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unsigned long write_point;
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enum bch_data_type data_type;
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2017-03-17 06:18:50 +00:00
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2022-10-31 20:13:05 +00:00
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/* calculated based on how many pointers we're actually going to use: */
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unsigned sectors_free;
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struct open_buckets ptrs;
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struct dev_stripe_state stripe;
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u64 sectors_allocated;
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} __attribute__((__aligned__(SMP_CACHE_BYTES)));
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struct {
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struct work_struct index_update_work;
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struct list_head writes;
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spinlock_t writes_lock;
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2017-03-17 06:18:50 +00:00
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2022-10-31 20:13:05 +00:00
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enum write_point_state state;
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u64 last_state_change;
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u64 time[WRITE_POINT_STATE_NR];
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} __attribute__((__aligned__(SMP_CACHE_BYTES)));
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2017-03-17 06:18:50 +00:00
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};
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struct write_point_specifier {
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unsigned long v;
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};
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#endif /* _BCACHEFS_ALLOC_TYPES_H */
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