- Don't call into bch2_encrypt_bio() when we're not encrypting
 - Pull slowpath out of trans_lock_write()
 - Make sure bc2h_trans_journal_res_get() gets inlined.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

 - With BCH_WRITE_SYNC, we no longer need the completion in struct
   dio_write
 - Pull out bch2_dio_write_copy_iov() into a separate non-inline
   function, it's code that doesn't run in the common case
 - Copy mapping and inode pointers into dio_write, avoiding pointer
   chasing at the start of bch2_dio_write_loop()
 - kthread_use_mm() is not needed in the common case; move it into
   bch2_dio_write_loop_async()
 - factor out various helpers from bch2_dio_write_loop() and rework
   control flow for better icache utilization

Other small optimizations:

 - bch2_keylist_free() is only used in one place, at the end of the
   bch2_write() path - drop the reinit
 - in bch2_disk_reservation_put(), check if res->sectors is nonzero
   before touching c->online_reserved, since that will likely be a cache
   miss
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: More DIO write path optimization

Better code prefetching (?)
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This adds a new flag for the write path, BCH_WRITE_SYNC, and switches
the O_DIRECT write path to use it when we're not running asynchronously.

It runs the btree update after the write in the original thread's
context instead of a kworker, cutting context switches in half.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Fixes for various checkpatch errors.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Dead code, delete.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This factors out a properly-documented helper for deciding when we want
to sort a btree node with MAX_BSETS bsets down to a single bset.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This replaces sysfs btree_avg_write_size with btree_write_stats, which
now breaks out statistics by the source of the btree write.

Btree writes that are too small are a source of inefficiency, and
excessive btree resort overhead - this will let us see what's causing
them.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Fixes fstests generic/648
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Per fstests generic/275, on -ENOSPC we're supposed write until the
filesystem is full - i.e. do a partial write instead of failing the full
write.

This is a partial fix for the buffered write path: we'll still fail on a
page boundary.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

 - In the btree iterator code that overlays keys from the journal, we
   were incorrectly specifying level=0 instead of the btree_path's
   current level in a few places
 - When we didn't do journal replay, we shouldn't free the journal keys:
   this fixes cmd_list and cmd_dump, which run in norecovery mode
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

roundup_pow_of_two() is undefined for 0 - oops.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Use __func__ in error messages that refer to function name, and do so
more uniformly - suggested by checkpatch.pl
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This adds an inlined version of bch2_bkey_cmp_packed(), and uses it in
bch2_sort_keys(), where it's part of the inner loop.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Long ago, bkey_unpack_key() was added to bset.h instead of bkey.h
because bkey.h didn't include btree_types.h, which it needs for the
compiled unpack function.

This patch finally moves it to the proper location.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This replaces an expensive memmove() call with an open-coded version.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This moves the JOURNAL_REPLAY_DONE flag check from
bch2_trans_iter_init() to bch2_trans_init(), where we stash a copy in
btree_trans - gaining us a small performance improvement.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

checkpatch.pl gives lots of warnings that we don't want - suggested
ignore list:

 ASSIGN_IN_IF
 UNSPECIFIED_INT	- bcachefs coding style prefers single token type names
 NEW_TYPEDEFS		- typedefs are occasionally good
 FUNCTION_ARGUMENTS	- we prefer to look at functions in .c files
			  (hopefully with docbook documentation), not .h
			  file prototypes
 MULTISTATEMENT_MACRO_USE_DO_WHILE
			- we have _many_ x-macros and other macros where
			  we can't do this
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

 - add bch2_dev_usage_read_fast(), which doesn't return by value -
   bch_dev_usage is big enough that we don't want the silent memcpy
 - tweak the allocation path to only call bch2_dev_usage_read() once per
   bucket allocated
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

crc.compression_type & nouce gets reset to inside bch2_rechecksum_bio(),
we set it back to the previous values calculated. This fixes
incompressible extents being marked as uncompressed.
Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This shouldn't be needed anymore, since we don't rely on the pointer
validity that this was guarding against anymore - we get a new good
reference and save it right after this function.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This separates out the slowpath of bch2_trans_update_by_path_trace()
into a new non-inlined helper.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Delete some code when CONFIG_BCACHEFS_DEBUG=n
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

It's mainly used from bch2_inode_write(), so inline it there.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

We don't want to fire the bucket_alloc_fail tracepoint on transaction
restart, when we can retry immediately - only when we the allocation
actually has to block.

Also, switch from sched_clock() to local_clock(), as we've been doing
elsewhere.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Now we store the transaction's fn idx in a local variable, instead of
redoing the lookup every time we call bch2_trans_init().
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This breaks up btree_path_up_until_good_node() so that only the fastpath
gets inlined.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

The shrinker assumes freed key cache items are ordered by age, so that
it doesn't have to scan the full list to find items that are old enough
(according to the srcu code) to be freed.

But percpu freelists broke this ordering; this patch fixes this by
ensuring we insert items into the proper position.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

A single block can't be compressed, so it's incompressible.
This stops rebalance repeatably marking extents as uncompressed.
Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Sometimes the user may need to change durability after formatting to
match current hardware setup, this option provides a quick and flexible
alternative to removing then adding the device.
It is HIGHLY ADVISED TO RUN REREPLICATE after changing this value so the
system doesn't remain degraded.
Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Appending new nodes to the end of the list means we're more likely to
evict old entries when btree_cache_scan() is started.
Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

 - We now correctly allow soft limits to be exceeded, instead of always
   returning -EDQUOT
 - Disk quota grate times/warnings can now be set, not just the
   systemwide defaults
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

local_clock() isn't always completely accurate - e.g. on machines with
TSC drift - but ktime_get_ns() overhead is too high, unfortunately.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

 - In userspace, we don't have real percpu variables; this patch
   disables the percpu freelists in userspace
 - add some error messages for the asserts in
   bch2_fs_btree_key_cache_exit(); we've been hitting this (only in
   userspace, oddly), perhaps this will help us track down the error.
 - bkey_cached_reuse() should likely be taking the key cache lock, and
   it's a slowpath so it doesn't hurt to
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

We were forgetting to count down the number of nodes to prefetch, firing
off _way_ more than intended - whoops.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

We don't actually allocate memory under the btree key cache lock - so
there's no recursion concerns, and the shrinker can just use
mutex_lock().
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

On journal read, previously we would do full journal entry validation
immediately after reading a journal entry.

However, this would lead to errors for journal entries we weren't
actually going to use, either because they were too old or too new
(newer than the most recent flush).

We've observed write tearing on journal entries newer than the newest
flush - which makes sense, prior to a flush there's no guarantees about
write persistence.

This patch defers full journal entry validation until the end of the
journal read path, when we know which journal entries we'll want to use.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Prep work for the next patch, to defer journal entry validation: we now
track for each replica whether we had a good checksum.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>