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Diffstat (limited to 'fs/bcachefs/bcachefs.h')
| -rw-r--r-- | fs/bcachefs/bcachefs.h | 785 |
1 files changed, 785 insertions, 0 deletions
diff --git a/fs/bcachefs/bcachefs.h b/fs/bcachefs/bcachefs.h new file mode 100644 index 000000000000..b5e119d09a83 --- /dev/null +++ b/fs/bcachefs/bcachefs.h @@ -0,0 +1,785 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_H +#define _BCACHEFS_H + +/* + * SOME HIGH LEVEL CODE DOCUMENTATION: + * + * Bcache mostly works with cache sets, cache devices, and backing devices. + * + * Support for multiple cache devices hasn't quite been finished off yet, but + * it's about 95% plumbed through. A cache set and its cache devices is sort of + * like a md raid array and its component devices. Most of the code doesn't care + * about individual cache devices, the main abstraction is the cache set. + * + * Multiple cache devices is intended to give us the ability to mirror dirty + * cached data and metadata, without mirroring clean cached data. + * + * Backing devices are different, in that they have a lifetime independent of a + * cache set. When you register a newly formatted backing device it'll come up + * in passthrough mode, and then you can attach and detach a backing device from + * a cache set at runtime - while it's mounted and in use. Detaching implicitly + * invalidates any cached data for that backing device. + * + * A cache set can have multiple (many) backing devices attached to it. + * + * There's also flash only volumes - this is the reason for the distinction + * between struct cached_dev and struct bcache_device. A flash only volume + * works much like a bcache device that has a backing device, except the + * "cached" data is always dirty. The end result is that we get thin + * provisioning with very little additional code. + * + * Flash only volumes work but they're not production ready because the moving + * garbage collector needs more work. More on that later. + * + * BUCKETS/ALLOCATION: + * + * Bcache is primarily designed for caching, which means that in normal + * operation all of our available space will be allocated. Thus, we need an + * efficient way of deleting things from the cache so we can write new things to + * it. + * + * To do this, we first divide the cache device up into buckets. A bucket is the + * unit of allocation; they're typically around 1 mb - anywhere from 128k to 2M+ + * works efficiently. + * + * Each bucket has a 16 bit priority, and an 8 bit generation associated with + * it. The gens and priorities for all the buckets are stored contiguously and + * packed on disk (in a linked list of buckets - aside from the superblock, all + * of bcache's metadata is stored in buckets). + * + * The priority is used to implement an LRU. We reset a bucket's priority when + * we allocate it or on cache it, and every so often we decrement the priority + * of each bucket. It could be used to implement something more sophisticated, + * if anyone ever gets around to it. + * + * The generation is used for invalidating buckets. Each pointer also has an 8 + * bit generation embedded in it; for a pointer to be considered valid, its gen + * must match the gen of the bucket it points into. Thus, to reuse a bucket all + * we have to do is increment its gen (and write its new gen to disk; we batch + * this up). + * + * Bcache is entirely COW - we never write twice to a bucket, even buckets that + * contain metadata (including btree nodes). + * + * THE BTREE: + * + * Bcache is in large part design around the btree. + * + * At a high level, the btree is just an index of key -> ptr tuples. + * + * Keys represent extents, and thus have a size field. Keys also have a variable + * number of pointers attached to them (potentially zero, which is handy for + * invalidating the cache). + * + * The key itself is an inode:offset pair. The inode number corresponds to a + * backing device or a flash only volume. The offset is the ending offset of the + * extent within the inode - not the starting offset; this makes lookups + * slightly more convenient. + * + * Pointers contain the cache device id, the offset on that device, and an 8 bit + * generation number. More on the gen later. + * + * Index lookups are not fully abstracted - cache lookups in particular are + * still somewhat mixed in with the btree code, but things are headed in that + * direction. + * + * Updates are fairly well abstracted, though. There are two different ways of + * updating the btree; insert and replace. + * + * BTREE_INSERT will just take a list of keys and insert them into the btree - + * overwriting (possibly only partially) any extents they overlap with. This is + * used to update the index after a write. + * + * BTREE_REPLACE is really cmpxchg(); it inserts a key into the btree iff it is + * overwriting a key that matches another given key. This is used for inserting + * data into the cache after a cache miss, and for background writeback, and for + * the moving garbage collector. + * + * There is no "delete" operation; deleting things from the index is + * accomplished by either by invalidating pointers (by incrementing a bucket's + * gen) or by inserting a key with 0 pointers - which will overwrite anything + * previously present at that location in the index. + * + * This means that there are always stale/invalid keys in the btree. They're + * filtered out by the code that iterates through a btree node, and removed when + * a btree node is rewritten. + * + * BTREE NODES: + * + * Our unit of allocation is a bucket, and we we can't arbitrarily allocate and + * free smaller than a bucket - so, that's how big our btree nodes are. + * + * (If buckets are really big we'll only use part of the bucket for a btree node + * - no less than 1/4th - but a bucket still contains no more than a single + * btree node. I'd actually like to change this, but for now we rely on the + * bucket's gen for deleting btree nodes when we rewrite/split a node.) + * + * Anyways, btree nodes are big - big enough to be inefficient with a textbook + * btree implementation. + * + * The way this is solved is that btree nodes are internally log structured; we + * can append new keys to an existing btree node without rewriting it. This + * means each set of keys we write is sorted, but the node is not. + * + * We maintain this log structure in memory - keeping 1Mb of keys sorted would + * be expensive, and we have to distinguish between the keys we have written and + * the keys we haven't. So to do a lookup in a btree node, we have to search + * each sorted set. But we do merge written sets together lazily, so the cost of + * these extra searches is quite low (normally most of the keys in a btree node + * will be in one big set, and then there'll be one or two sets that are much + * smaller). + * + * This log structure makes bcache's btree more of a hybrid between a + * conventional btree and a compacting data structure, with some of the + * advantages of both. + * + * GARBAGE COLLECTION: + * + * We can't just invalidate any bucket - it might contain dirty data or + * metadata. If it once contained dirty data, other writes might overwrite it + * later, leaving no valid pointers into that bucket in the index. + * + * Thus, the primary purpose of garbage collection is to find buckets to reuse. + * It also counts how much valid data it each bucket currently contains, so that + * allocation can reuse buckets sooner when they've been mostly overwritten. + * + * It also does some things that are really internal to the btree + * implementation. If a btree node contains pointers that are stale by more than + * some threshold, it rewrites the btree node to avoid the bucket's generation + * wrapping around. It also merges adjacent btree nodes if they're empty enough. + * + * THE JOURNAL: + * + * Bcache's journal is not necessary for consistency; we always strictly + * order metadata writes so that the btree and everything else is consistent on + * disk in the event of an unclean shutdown, and in fact bcache had writeback + * caching (with recovery from unclean shutdown) before journalling was + * implemented. + * + * Rather, the journal is purely a performance optimization; we can't complete a + * write until we've updated the index on disk, otherwise the cache would be + * inconsistent in the event of an unclean shutdown. This means that without the + * journal, on random write workloads we constantly have to update all the leaf + * nodes in the btree, and those writes will be mostly empty (appending at most + * a few keys each) - highly inefficient in terms of amount of metadata writes, + * and it puts more strain on the various btree resorting/compacting code. + * + * The journal is just a log of keys we've inserted; on startup we just reinsert + * all the keys in the open journal entries. That means that when we're updating + * a node in the btree, we can wait until a 4k block of keys fills up before + * writing them out. + * + * For simplicity, we only journal updates to leaf nodes; updates to parent + * nodes are rare enough (since our leaf nodes are huge) that it wasn't worth + * the complexity to deal with journalling them (in particular, journal replay) + * - updates to non leaf nodes just happen synchronously (see btree_split()). + */ + +#undef pr_fmt +#define pr_fmt(fmt) "bcachefs: %s() " fmt "\n", __func__ + +#include <linux/backing-dev-defs.h> +#include <linux/bug.h> +#include <linux/bio.h> +#include <linux/closure.h> +#include <linux/kobject.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/percpu-refcount.h> +#include <linux/percpu-rwsem.h> +#include <linux/rhashtable.h> +#include <linux/rwsem.h> +#include <linux/seqlock.h> +#include <linux/shrinker.h> +#include <linux/types.h> +#include <linux/workqueue.h> +#include <linux/zstd.h> + +#include "bcachefs_format.h" +#include "fifo.h" +#include "opts.h" +#include "util.h" + +#define dynamic_fault(...) 0 +#define race_fault(...) 0 + +#define bch2_fs_init_fault(name) \ + dynamic_fault("bcachefs:bch_fs_init:" name) +#define bch2_meta_read_fault(name) \ + dynamic_fault("bcachefs:meta:read:" name) +#define bch2_meta_write_fault(name) \ + dynamic_fault("bcachefs:meta:write:" name) + +#ifdef __KERNEL__ +#define bch2_fmt(_c, fmt) "bcachefs (%s): " fmt "\n", ((_c)->name) +#else +#define bch2_fmt(_c, fmt) fmt "\n" +#endif + +#define bch_info(c, fmt, ...) \ + printk(KERN_INFO bch2_fmt(c, fmt), ##__VA_ARGS__) +#define bch_notice(c, fmt, ...) \ + printk(KERN_NOTICE bch2_fmt(c, fmt), ##__VA_ARGS__) +#define bch_warn(c, fmt, ...) \ + printk(KERN_WARNING bch2_fmt(c, fmt), ##__VA_ARGS__) +#define bch_err(c, fmt, ...) \ + printk(KERN_ERR bch2_fmt(c, fmt), ##__VA_ARGS__) + +#define bch_verbose(c, fmt, ...) \ +do { \ + if ((c)->opts.verbose_recovery) \ + bch_info(c, fmt, ##__VA_ARGS__); \ +} while (0) + +#define pr_verbose_init(opts, fmt, ...) \ +do { \ + if (opt_get(opts, verbose_init)) \ + pr_info(fmt, ##__VA_ARGS__); \ +} while (0) + +/* Parameters that are useful for debugging, but should always be compiled in: */ +#define BCH_DEBUG_PARAMS_ALWAYS() \ + BCH_DEBUG_PARAM(key_merging_disabled, \ + "Disables merging of extents") \ + BCH_DEBUG_PARAM(btree_gc_always_rewrite, \ + "Causes mark and sweep to compact and rewrite every " \ + "btree node it traverses") \ + BCH_DEBUG_PARAM(btree_gc_rewrite_disabled, \ + "Disables rewriting of btree nodes during mark and sweep")\ + BCH_DEBUG_PARAM(btree_shrinker_disabled, \ + "Disables the shrinker callback for the btree node cache") + +/* Parameters that should only be compiled in in debug mode: */ +#define BCH_DEBUG_PARAMS_DEBUG() \ + BCH_DEBUG_PARAM(expensive_debug_checks, \ + "Enables various runtime debugging checks that " \ + "significantly affect performance") \ + BCH_DEBUG_PARAM(debug_check_bkeys, \ + "Run bkey_debugcheck (primarily checking GC/allocation "\ + "information) when iterating over keys") \ + BCH_DEBUG_PARAM(verify_btree_ondisk, \ + "Reread btree nodes at various points to verify the " \ + "mergesort in the read path against modifications " \ + "done in memory") \ + BCH_DEBUG_PARAM(journal_seq_verify, \ + "Store the journal sequence number in the version " \ + "number of every btree key, and verify that btree " \ + "update ordering is preserved during recovery") \ + BCH_DEBUG_PARAM(inject_invalid_keys, \ + "Store the journal sequence number in the version " \ + "number of every btree key, and verify that btree " \ + "update ordering is preserved during recovery") \ + +#define BCH_DEBUG_PARAMS_ALL() BCH_DEBUG_PARAMS_ALWAYS() BCH_DEBUG_PARAMS_DEBUG() + +#ifdef CONFIG_BCACHEFS_DEBUG +#define BCH_DEBUG_PARAMS() BCH_DEBUG_PARAMS_ALL() +#else +#define BCH_DEBUG_PARAMS() BCH_DEBUG_PARAMS_ALWAYS() +#endif + +#define BCH_TIME_STATS() \ + x(btree_node_mem_alloc) \ + x(btree_gc) \ + x(btree_split) \ + x(btree_sort) \ + x(btree_read) \ + x(btree_lock_contended_read) \ + x(btree_lock_contended_intent) \ + x(btree_lock_contended_write) \ + x(data_write) \ + x(data_read) \ + x(data_promote) \ + x(journal_write) \ + x(journal_delay) \ + x(journal_blocked) \ + x(journal_flush_seq) + +enum bch_time_stats { +#define x(name) BCH_TIME_##name, + BCH_TIME_STATS() +#undef x + BCH_TIME_STAT_NR +}; + +#include "alloc_types.h" +#include "btree_types.h" +#include "buckets_types.h" +#include "clock_types.h" +#include "journal_types.h" +#include "keylist_types.h" +#include "quota_types.h" +#include "rebalance_types.h" +#include "super_types.h" + +/* Number of nodes btree coalesce will try to coalesce at once */ +#define GC_MERGE_NODES 4U + +/* Maximum number of nodes we might need to allocate atomically: */ +#define BTREE_RESERVE_MAX (BTREE_MAX_DEPTH + (BTREE_MAX_DEPTH - 1)) + +/* Size of the freelist we allocate btree nodes from: */ +#define BTREE_NODE_RESERVE (BTREE_RESERVE_MAX * 4) + +struct btree; + +enum gc_phase { + GC_PHASE_START, + GC_PHASE_SB, + +#define DEF_BTREE_ID(kwd, val, name) GC_PHASE_BTREE_##kwd, + DEFINE_BCH_BTREE_IDS() +#undef DEF_BTREE_ID + + GC_PHASE_PENDING_DELETE, + GC_PHASE_ALLOC, + GC_PHASE_DONE +}; + +struct gc_pos { + enum gc_phase phase; + struct bpos pos; + unsigned level; +}; + +struct io_count { + u64 sectors[2][BCH_DATA_NR]; +}; + +struct bch_dev { + struct kobject kobj; + struct percpu_ref ref; + struct completion ref_completion; + struct percpu_ref io_ref; + struct completion io_ref_completion; + + struct bch_fs *fs; + + u8 dev_idx; + /* + * Cached version of this device's member info from superblock + * Committed by bch2_write_super() -> bch_fs_mi_update() + */ + struct bch_member_cpu mi; + __uuid_t uuid; + char name[BDEVNAME_SIZE]; + + struct bch_sb_handle disk_sb; + int sb_write_error; + + struct bch_devs_mask self; + + /* biosets used in cloned bios for writing multiple replicas */ + struct bio_set replica_set; + + /* + * Buckets: + * Per-bucket arrays are protected by c->usage_lock, bucket_lock and + * gc_lock, for device resize - holding any is sufficient for access: + * Or rcu_read_lock(), but only for ptr_stale(): + */ + struct bucket_array __rcu *buckets; + unsigned long *buckets_dirty; + /* most out of date gen in the btree */ + u8 *oldest_gens; + struct rw_semaphore bucket_lock; + + struct bch_dev_usage __percpu *usage_percpu; + struct bch_dev_usage usage_cached; + + /* Allocator: */ + struct task_struct __rcu *alloc_thread; + + /* + * free: Buckets that are ready to be used + * + * free_inc: Incoming buckets - these are buckets that currently have + * cached data in them, and we can't reuse them until after we write + * their new gen to disk. After prio_write() finishes writing the new + * gens/prios, they'll be moved to the free list (and possibly discarded + * in the process) + */ + alloc_fifo free[RESERVE_NR]; + alloc_fifo free_inc; + spinlock_t freelist_lock; + size_t nr_invalidated; + + u8 open_buckets_partial[OPEN_BUCKETS_COUNT]; + unsigned open_buckets_partial_nr; + + size_t fifo_last_bucket; + + /* last calculated minimum prio */ + u16 max_last_bucket_io[2]; + + atomic_long_t saturated_count; + size_t inc_gen_needs_gc; + size_t inc_gen_really_needs_gc; + u64 allocator_journal_seq_flush; + bool allocator_invalidating_data; + bool allocator_blocked; + + alloc_heap alloc_heap; + + /* Copying GC: */ + struct task_struct *copygc_thread; + copygc_heap copygc_heap; + struct bch_pd_controller copygc_pd; + struct write_point copygc_write_point; + + atomic64_t rebalance_work; + + struct journal_device journal; + + struct work_struct io_error_work; + + /* The rest of this all shows up in sysfs */ + atomic64_t cur_latency[2]; + struct bch2_time_stats io_latency[2]; + +#define CONGESTED_MAX 1024 + atomic_t congested; + u64 congested_last; + + struct io_count __percpu *io_done; +}; + +/* + * Flag bits for what phase of startup/shutdown the cache set is at, how we're + * shutting down, etc.: + * + * BCH_FS_UNREGISTERING means we're not just shutting down, we're detaching + * all the backing devices first (their cached data gets invalidated, and they + * won't automatically reattach). + */ +enum { + /* startup: */ + BCH_FS_ALLOC_READ_DONE, + BCH_FS_ALLOCATOR_STARTED, + BCH_FS_INITIAL_GC_DONE, + BCH_FS_FSCK_DONE, + BCH_FS_STARTED, + + /* shutdown: */ + BCH_FS_EMERGENCY_RO, + BCH_FS_WRITE_DISABLE_COMPLETE, + + /* errors: */ + BCH_FS_ERROR, + BCH_FS_GC_FAILURE, + + /* misc: */ + BCH_FS_BDEV_MOUNTED, + BCH_FS_FSCK_FIXED_ERRORS, + BCH_FS_FIXED_GENS, + BCH_FS_REBUILD_REPLICAS, + BCH_FS_HOLD_BTREE_WRITES, +}; + +struct btree_debug { + unsigned id; + struct dentry *btree; + struct dentry *btree_format; + struct dentry *failed; +}; + +enum bch_fs_state { + BCH_FS_STARTING = 0, + BCH_FS_STOPPING, + BCH_FS_RO, + BCH_FS_RW, +}; + +struct bch_fs { + struct closure cl; + + struct list_head list; + struct kobject kobj; + struct kobject internal; + struct kobject opts_dir; + struct kobject time_stats; + unsigned long flags; + + int minor; + struct device *chardev; + struct super_block *vfs_sb; + char name[40]; + + /* ro/rw, add/remove devices: */ + struct mutex state_lock; + enum bch_fs_state state; + + /* Counts outstanding writes, for clean transition to read-only */ + struct percpu_ref writes; + struct work_struct read_only_work; + + struct bch_dev __rcu *devs[BCH_SB_MEMBERS_MAX]; + + struct bch_replicas_cpu __rcu *replicas; + struct bch_replicas_cpu __rcu *replicas_gc; + struct mutex replicas_gc_lock; + + struct bch_disk_groups_cpu __rcu *disk_groups; + + struct bch_opts opts; + + /* Updated by bch2_sb_update():*/ + struct { + __uuid_t uuid; + __uuid_t user_uuid; + + u16 encoded_extent_max; + + u8 nr_devices; + u8 clean; + + u8 encryption_type; + + u64 time_base_lo; + u32 time_base_hi; + u32 time_precision; + u64 features; + } sb; + + struct bch_sb_handle disk_sb; + + unsigned short block_bits; /* ilog2(block_size) */ + + u16 btree_foreground_merge_threshold; + + struct closure sb_write; + struct mutex sb_lock; + + /* BTREE CACHE */ + struct bio_set btree_bio; + + struct btree_root btree_roots[BTREE_ID_NR]; + bool btree_roots_dirty; + struct mutex btree_root_lock; + + struct btree_cache btree_cache; + + mempool_t btree_reserve_pool; + + /* + * Cache of allocated btree nodes - if we allocate a btree node and + * don't use it, if we free it that space can't be reused until going + * _all_ the way through the allocator (which exposes us to a livelock + * when allocating btree reserves fail halfway through) - instead, we + * can stick them here: + */ + struct btree_alloc btree_reserve_cache[BTREE_NODE_RESERVE * 2]; + unsigned btree_reserve_cache_nr; + struct mutex btree_reserve_cache_lock; + + mempool_t btree_interior_update_pool; + struct list_head btree_interior_update_list; + struct mutex btree_interior_update_lock; + struct closure_waitlist btree_interior_update_wait; + + struct workqueue_struct *wq; + /* copygc needs its own workqueue for index updates.. */ + struct workqueue_struct *copygc_wq; + + /* ALLOCATION */ + struct delayed_work pd_controllers_update; + unsigned pd_controllers_update_seconds; + + struct bch_devs_mask rw_devs[BCH_DATA_NR]; + + u64 capacity; /* sectors */ + + /* + * When capacity _decreases_ (due to a disk being removed), we + * increment capacity_gen - this invalidates outstanding reservations + * and forces them to be revalidated + */ + u32 capacity_gen; + + atomic64_t sectors_available; + + struct bch_fs_usage __percpu *usage_percpu; + struct bch_fs_usage usage_cached; + struct percpu_rw_semaphore usage_lock; + + struct closure_waitlist freelist_wait; + + /* + * When we invalidate buckets, we use both the priority and the amount + * of good data to determine which buckets to reuse first - to weight + * those together consistently we keep track of the smallest nonzero + * priority of any bucket. + */ + struct bucket_clock bucket_clock[2]; + + struct io_clock io_clock[2]; + + /* ALLOCATOR */ + spinlock_t freelist_lock; + u8 open_buckets_freelist; + u8 open_buckets_nr_free; + struct closure_waitlist open_buckets_wait; + struct open_bucket open_buckets[OPEN_BUCKETS_COUNT]; + + struct write_point btree_write_point; + struct write_point rebalance_write_point; + + struct write_point write_points[WRITE_POINT_COUNT]; + struct hlist_head write_points_hash[WRITE_POINT_COUNT]; + struct mutex write_points_hash_lock; + + /* GARBAGE COLLECTION */ + struct task_struct *gc_thread; + atomic_t kick_gc; + unsigned long gc_count; + + /* + * Tracks GC's progress - everything in the range [ZERO_KEY..gc_cur_pos] + * has been marked by GC. + * + * gc_cur_phase is a superset of btree_ids (BTREE_ID_EXTENTS etc.) + * + * gc_cur_phase == GC_PHASE_DONE indicates that gc is finished/not + * currently running, and gc marks are currently valid + * + * Protected by gc_pos_lock. Only written to by GC thread, so GC thread + * can read without a lock. + */ + seqcount_t gc_pos_lock; + struct gc_pos gc_pos; + + /* + * The allocation code needs gc_mark in struct bucket to be correct, but + * it's not while a gc is in progress. + */ + struct rw_semaphore gc_lock; + + /* IO PATH */ + struct bio_set bio_read; + struct bio_set bio_read_split; + struct bio_set bio_write; + struct mutex bio_bounce_pages_lock; + mempool_t bio_bounce_pages; + struct rhashtable promote_table; + + mempool_t compression_bounce[2]; + mempool_t compress_workspace[BCH_COMPRESSION_NR]; + mempool_t decompress_workspace; + ZSTD_parameters zstd_params; + + struct crypto_shash *sha256; + struct crypto_sync_skcipher *chacha20; + struct crypto_shash *poly1305; + + atomic64_t key_version; + + /* REBALANCE */ + struct bch_fs_rebalance rebalance; + + /* VFS IO PATH - fs-io.c */ + struct bio_set writepage_bioset; + struct bio_set dio_write_bioset; + struct bio_set dio_read_bioset; + + struct bio_list btree_write_error_list; + struct work_struct btree_write_error_work; + spinlock_t btree_write_error_lock; + + /* ERRORS */ + struct list_head fsck_errors; + struct mutex fsck_error_lock; + bool fsck_alloc_err; + + /* FILESYSTEM */ + atomic_long_t nr_inodes; + + /* QUOTAS */ + struct bch_memquota_type quotas[QTYP_NR]; + + /* DEBUG JUNK */ + struct dentry *debug; + struct btree_debug btree_debug[BTREE_ID_NR]; +#ifdef CONFIG_BCACHEFS_DEBUG + struct btree *verify_data; + struct btree_node *verify_ondisk; + struct mutex verify_lock; +#endif + + u64 unused_inode_hint; + + /* + * A btree node on disk could have too many bsets for an iterator to fit + * on the stack - have to dynamically allocate them + */ + mempool_t fill_iter; + + mempool_t btree_bounce_pool; + + struct journal journal; + + unsigned bucket_journal_seq; + + /* The rest of this all shows up in sysfs */ + atomic_long_t read_realloc_races; + atomic_long_t extent_migrate_done; + atomic_long_t extent_migrate_raced; + + unsigned btree_gc_periodic:1; + unsigned copy_gc_enabled:1; + bool promote_whole_extents; + +#define BCH_DEBUG_PARAM(name, description) bool name; + BCH_DEBUG_PARAMS_ALL() +#undef BCH_DEBUG_PARAM + + struct bch2_time_stats times[BCH_TIME_STAT_NR]; +}; + +static inline void bch2_set_ra_pages(struct bch_fs *c, unsigned ra_pages) +{ +#ifndef NO_BCACHEFS_FS + if (c->vfs_sb) + c->vfs_sb->s_bdi->ra_pages = ra_pages; +#endif +} + +static inline bool bch2_fs_running(struct bch_fs *c) +{ + return c->state == BCH_FS_RO || c->state == BCH_FS_RW; +} + +static inline unsigned bucket_bytes(const struct bch_dev *ca) +{ + return ca->mi.bucket_size << 9; +} + +static inline unsigned block_bytes(const struct bch_fs *c) +{ + return c->opts.block_size << 9; +} + +static inline struct timespec64 bch2_time_to_timespec(struct bch_fs *c, u64 time) +{ + return ns_to_timespec64(time * c->sb.time_precision + c->sb.time_base_lo); +} + +static inline s64 timespec_to_bch2_time(struct bch_fs *c, struct timespec64 ts) +{ + s64 ns = timespec64_to_ns(&ts) - c->sb.time_base_lo; + + if (c->sb.time_precision == 1) + return ns; + + return div_s64(ns, c->sb.time_precision); +} + +static inline s64 bch2_current_time(struct bch_fs *c) +{ + struct timespec64 now; + + ktime_get_real_ts64(&now); + return timespec_to_bch2_time(c, now); +} + +#endif /* _BCACHEFS_H */ |