linux.git/fs/bcachefs/clock.c, branch v6.10

bcachefs: io clock: run timer fns under clock lock

2024-07-02T02:56:28+00:00

We don't have a way to flush a timer that's executing the callback, and
this is simple and limited enough in scope that we can just use the lock
instead.

Needed for the next patch that adds direct wakeups from the allocator to
copygc, where we're now more frequently calling io_timer_del() on an
expiring timer.

Signed-off-by: Kent Overstreet

bcachefs: bch2_kthread_io_clock_wait() no longer sleeps until full amount

2024-01-21T18:27:09+00:00

Drop t he loop in bch2_kthread_io_clock_wait(): this allows the code
that uses it to be woken up for other reasons, and fixes a bug where
rebalance wouldn't wake up when a scan was requested.

This raises the possibility of spurious wakeups, but callers should
always be able to handle that reasonably well.

Signed-off-by: Kent Overstreet

bcachefs: Private error codes: ENOMEM

2023-10-22T21:09:57+00:00

This adds private error codes for most (but not all) of our ENOMEM uses,
which makes it easier to track down assorted allocation failures.

Signed-off-by: Kent Overstreet

bcachefs: Printbuf rework

2023-10-22T21:09:33+00:00

This converts bcachefs to the modern printbuf interface/implementation,
synced with the version to be submitted upstream.

Signed-off-by: Kent Overstreet

bcachefs: Heap allocate printbufs

2023-10-22T21:09:25+00:00

This patch changes printbufs dynamically allocate and reallocate a
buffer as needed. Stack usage has become a bit of a problem, and a major
cause of that has been static size string buffers on the stack.

The most involved part of this refactoring is that printbufs must now be
exited with printbuf_exit().

Signed-off-by: Kent Overstreet

bcachefs: Persist 64 bit io clocks

2023-10-22T21:08:52+00:00

Originally, bcachefs - going back to bcache - stored, for each bucket, a
16 bit counter corresponding to how long it had been since the bucket
was read from. But, this required periodically rescaling counters on
every bucket to avoid wraparound. That wasn't an issue in bcache, where
we'd perodically rewrite the per bucket metadata all at once, but in
bcachefs we're trying to avoid having to walk every single bucket.

This patch switches to persisting 64 bit io clocks, corresponding to the
64 bit bucket timestaps introduced in the previous patch with
KEY_TYPE_alloc_v2.

Signed-off-by: Kent Overstreet 
Signed-off-by: Kent Overstreet

bcachefs: Convert various code to printbuf

2023-10-22T21:08:43+00:00

printbufs know how big the buffer is that was allocated, so we can get
rid of the random PAGE_SIZEs all over the place.

Signed-off-by: Kent Overstreet

bcachefs: Add debug code to print btree transactions

2023-10-22T21:08:40+00:00

Intented to help debug deadlocks, since we can't use lockdep to check
btree node lock ordering.

Signed-off-by: Kent Overstreet

bcachefs: Make io timers less buggy

2023-10-22T21:08:33+00:00

Signed-off-by: Kent Overstreet 
Signed-off-by: Kent Overstreet

bcachefs: Inline fast path of bch2_increment_clock()

2023-10-22T21:08:31+00:00

Shaving more cycles.

Signed-off-by: Kent Overstreet 
Signed-off-by: Kent Overstreet