linux-block.git
11 months agobcachefs: bch2_btree_iter_peek_slot() now works on interior nodes
Kent Overstreet [Thu, 14 Apr 2022 19:45:00 +0000 (15:45 -0400)]
bcachefs: bch2_btree_iter_peek_slot() now works on interior nodes

The new backpointers code will be using bch2_btree_iter_peek_slot() on
interior nodes - this patch updates peek_slot() to make that work.

 - Pass the correct level to bch2_journal_keys_peek_slot()
 - We should only set BTREE_ITER_CACHED or BTREE_ITER_WITH_KEY_CACHE
   when using bch2_trans_iter_init(), not bch2_trans_node_iter_init()
 - Update assertions

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: btree_update_interior.c prep for backpointers
Kent Overstreet [Thu, 14 Apr 2022 19:37:16 +0000 (15:37 -0400)]
bcachefs: btree_update_interior.c prep for backpointers

Previously, btree_update_interior.c passed keys to bch2_trans_mark_*
that hadn't been fully initialized - they didn't have the key field
filled out, just the value.

With backpointers, we need to make sure keys are fully initialized
before marking them - because the backpointer points back to the
original key.

This patch tweaks the interior update paths to fix this.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Plumb btree_id & level to trans_mark
Kent Overstreet [Fri, 1 Apr 2022 01:44:55 +0000 (21:44 -0400)]
bcachefs: Plumb btree_id & level to trans_mark

For backpointers, we'll need the full key location - that means btree_id
and btree level. This patch plumbs it through.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve some fsck error messages
Kent Overstreet [Sat, 16 Apr 2022 22:59:58 +0000 (18:59 -0400)]
bcachefs: Improve some fsck error messages

We have string names for d_type; use it.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Go emergency RO when i_blocks underflows
Kent Overstreet [Sat, 16 Apr 2022 20:06:59 +0000 (16:06 -0400)]
bcachefs: Go emergency RO when i_blocks underflows

This improves some of our warnings and assertions - they imply possible
filesystem inconsistencies, so they should be calling
bch2_fs_inconsistent().

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Ensure sysfs show fns print a newline
Kent Overstreet [Fri, 15 Apr 2022 00:30:30 +0000 (20:30 -0400)]
bcachefs: Ensure sysfs show fns print a newline

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Kill old rebuild_replicas option
Kent Overstreet [Wed, 13 Apr 2022 00:03:19 +0000 (20:03 -0400)]
bcachefs: Kill old rebuild_replicas option

This option was useful when the replicas mechism was new and still being
debugged, but hasn't been used in ages - let's delete it.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: In fsck, pass BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE when deleting dirents
Kent Overstreet [Tue, 12 Apr 2022 17:09:09 +0000 (13:09 -0400)]
bcachefs: In fsck, pass BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE when deleting dirents

A user reported an error where we hit an assertion due to deleting a key
in an internal snapshot node, when deleting a dirent that points to a
nonexisting inode.

We try to avoid doing updates to keys for internal snapshot nodes, but
upon inspection of the places where we remove dirents in fsck it appears
BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE is correct for all of them: either
the target dirent doesn't exist, or it's a directory with multiple
dirents pointing to it.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix for getting stuck in journal replay
Kent Overstreet [Tue, 12 Apr 2022 05:31:33 +0000 (01:31 -0400)]
bcachefs: Fix for getting stuck in journal replay

In journal replay, we weren't immediately dropping journal pins when we
start doing updates that ewern't from journal replay - leading to
journal reclaim getting stuck.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve error logging in fsck.c
Kent Overstreet [Tue, 12 Apr 2022 02:36:53 +0000 (22:36 -0400)]
bcachefs: Improve error logging in fsck.c

This adds error logging to a bunch of functions in fsck.c - in fsck,
reduntant error messages is probably better than not enough.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix inode_backpointer_exists()
Kent Overstreet [Tue, 12 Apr 2022 02:36:13 +0000 (22:36 -0400)]
bcachefs: Fix inode_backpointer_exists()

If the dirent an inode points to doesn't exist, we shouldn't be
returning an error - just 0/false.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve bch2_lru_delete() error messages
Kent Overstreet [Tue, 12 Apr 2022 00:57:01 +0000 (20:57 -0400)]
bcachefs: Improve bch2_lru_delete() error messages

When we detect a filesystem inconsistency, we should include the
relevent keys in the error message. This patch adds a parameter to pass
the key with the lru entry to bch2_lru_delete(), so that it can be
printed.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Introduce bch2_journal_keys_peek_(upto|slot)()
Kent Overstreet [Tue, 12 Apr 2022 00:28:13 +0000 (20:28 -0400)]
bcachefs: Introduce bch2_journal_keys_peek_(upto|slot)()

When many journal replay keys have been overwritten,
bch2_journal_keys_peek() was taking excessively long to scan before it
found a key to return.

Fix this by introducing bch2_journal_keys_peek_upto() which takes a
parameter for the end of the range we want, so that we can terminate the
search much sooner, and replace all uses of bch2_journal_keys_peek()
with peek_upto() or peek_slot().

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve error message when alloc key doesn't match lru entry
Kent Overstreet [Mon, 11 Apr 2022 21:23:39 +0000 (17:23 -0400)]
bcachefs: Improve error message when alloc key doesn't match lru entry

Error messages should always print out the full key when available -
this gives us a starting point when looking through the journal to debug
what went wrong.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Ensure buckets have io_time[READ] set
Kent Overstreet [Sun, 10 Apr 2022 23:59:26 +0000 (19:59 -0400)]
bcachefs: Ensure buckets have io_time[READ] set

It's an error if a bucket is in state BCH_DATA_cached but not on the LRU
btree - i.e io_time[READ] == 0 - so, make sure it's set before adding
it.

Also, make some of the LRU code a bit clearer and more direct.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Use bch2_trans_inconsistent_on() in more places
Kent Overstreet [Sun, 10 Apr 2022 22:12:04 +0000 (18:12 -0400)]
bcachefs: Use bch2_trans_inconsistent_on() in more places

This gets us better error messages.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve bch2_open_buckets_to_text()
Kent Overstreet [Sun, 10 Apr 2022 22:04:24 +0000 (18:04 -0400)]
bcachefs: Improve bch2_open_buckets_to_text()

This patch updates bch2_open_buckets_to_text() to include the device and
bucket the open_bucket owns.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix CPU usage in journal read path
Kent Overstreet [Sun, 10 Apr 2022 20:26:34 +0000 (16:26 -0400)]
bcachefs: Fix CPU usage in journal read path

In journal_entry_add(), we were repeatedly scanning the journal entries
radix tree to scan for old entries that can be freed, with O(n^2)
behaviour. This patch tweaks things to remember the previous last_seq,
so we don't have to scan for entries to free from the start.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix a null ptr deref
Kent Overstreet [Sun, 10 Apr 2022 18:36:10 +0000 (14:36 -0400)]
bcachefs: Fix a null ptr deref

We start doing allocations before the GC thread is created, which means
we need to check for that to avoid a null ptr deref.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Don't trigger extra assertions in journal replay
Kent Overstreet [Sun, 10 Apr 2022 04:48:36 +0000 (00:48 -0400)]
bcachefs: Don't trigger extra assertions in journal replay

We now pass a rw argument to .key_invalid methods so they can trigger
assertions for updates but not on existing keys. We shouldn't trigger
these extra assertions in journal replay - this patch changes the
transaction commit path accordingly.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Minor device removal fixes
Kent Overstreet [Sat, 9 Apr 2022 19:15:36 +0000 (15:15 -0400)]
bcachefs: Minor device removal fixes

 - We weren't clearing the LRU btree
 - bch2_alloc_read() runs before bch2_check_alloc_key() deletes alloc
   keys for devices/buckets that don't exists, so it needs to check for
   that
 - bch2_check_lrus() needs to check that buckets exists
 - improve some error messages

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix a few warnings on 32 bit
Kent Overstreet [Sun, 10 Apr 2022 00:29:26 +0000 (20:29 -0400)]
bcachefs: Fix a few warnings on 32 bit

These showed up when building for mips.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: bch2_btree_delete_extent_at()
Kent Overstreet [Sat, 9 Apr 2022 19:07:11 +0000 (15:07 -0400)]
bcachefs: bch2_btree_delete_extent_at()

New helper, for deleting extents.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Don't skip triggers in fcollapse()
Kent Overstreet [Sat, 9 Apr 2022 03:54:14 +0000 (23:54 -0400)]
bcachefs: Don't skip triggers in fcollapse()

With backpointers this doesn't work anymore - backpointers always need
to be updated to point to the new extent position.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Initialize ec work structs early
Kent Overstreet [Sat, 9 Apr 2022 05:23:50 +0000 (01:23 -0400)]
bcachefs: Initialize ec work structs early

We need to ensure that work structs in bch_fs always get initialized -
otherwise an error in filesystem initialization can pop a warning in the
workqueue code when we try to cancel a work struct that wasn't
initialized.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Use a genradix for reading journal entries
Kent Overstreet [Mon, 21 Mar 2022 04:15:53 +0000 (00:15 -0400)]
bcachefs: Use a genradix for reading journal entries

Previously, the journal read path used a linked list for storing the
journal entries we read from disk. But there's been a bug that's been
causing journal_flush_delay to incorrectly be set to 0, leading to far
more journal entries than is normal being written out, which then means
filesystems are no longer able to start due to the O(n^2) behaviour of
inserting into/searching that linked list.

Fix this by switching to a radix tree.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Refactor journal_keys_sort() to return an error code
Kent Overstreet [Mon, 21 Mar 2022 04:15:53 +0000 (00:15 -0400)]
bcachefs: Refactor journal_keys_sort() to return an error code

When there weren't any keys in the journal there's no need to allocate
the buffer - but doing that causes a spurious -ENOMEM.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fold bucket_state in to BCH_DATA_TYPES()
Kent Overstreet [Fri, 1 Apr 2022 05:29:59 +0000 (01:29 -0400)]
bcachefs: Fold bucket_state in to BCH_DATA_TYPES()

Previously, we were missing accounting for buckets in need_gc_gens and
need_discard states. This matters because buckets in those states need
other btree operations done before they can be used, so they can't be
conuted when checking current number of free buckets against the
allocation watermark.

Also, we weren't directly counting free buckets at all. Now, data type 0
== BCH_DATA_free, and free buckets are counted; this means we can get
rid of the separate (poorly defined) count of unavailable buckets.

This is a new on disk format version, with upgrade and fsck required for
the accounting changes.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Add a sysfs attr for triggering discards
Kent Overstreet [Thu, 7 Apr 2022 22:38:16 +0000 (18:38 -0400)]
bcachefs: Add a sysfs attr for triggering discards

We're currently debugging an issue with discards not getting run; this
patch adds a manual trigger so we can then watch the tracepoint while it
runs.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Topology repair fixes
Kent Overstreet [Thu, 7 Apr 2022 21:41:02 +0000 (17:41 -0400)]
bcachefs: Topology repair fixes

 - We were failing to start topology repair, because we hadn't set the
   superblock flag indicating it needed to run
 - set_node_min() forget to update the btree node's key
 - bch2_gc_alloc_reset() didn't reset data type, leading to inserting an
   invalid key that was empty but had nonzero data type

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Use bch2_trans_inconsistent() more
Kent Overstreet [Thu, 7 Apr 2022 21:34:57 +0000 (17:34 -0400)]
bcachefs: Use bch2_trans_inconsistent() more

This gets us better error messages.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Move alloc assertion to .key_invalid()
Kent Overstreet [Thu, 7 Apr 2022 21:32:57 +0000 (17:32 -0400)]
bcachefs: Move alloc assertion to .key_invalid()

.key_invalid is a better place for this assertion.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve btree_bad_header()
Kent Overstreet [Thu, 7 Apr 2022 21:28:09 +0000 (17:28 -0400)]
bcachefs: Improve btree_bad_header()

In the future printbufs will be mempool-ified, so we shouldn't be using
more than one at a time if we don't have to.

This also fixes an extra trailing newline.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Check for read_time == 0 in bch2_alloc_v4_invalid()
Kent Overstreet [Wed, 6 Apr 2022 21:22:47 +0000 (17:22 -0400)]
bcachefs: Check for read_time == 0 in bch2_alloc_v4_invalid()

We've been seeing this error in fsck and we weren't able to track down
where it came from - but now that .key_invalid methods take a rw
argument, we can safely check for this.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: fsck: Work around transaction restarts
Kent Overstreet [Wed, 6 Apr 2022 18:35:10 +0000 (14:35 -0400)]
bcachefs: fsck: Work around transaction restarts

In check_extents() and check_dirents(), we're working towards only
handling transaction restarts in one place, at the top level - but we're
not there yet. check_i_sectors() and check_subdir_count() handle
transaction restarts locally, which means the iterator for the
dirent/extent is left unlocked (should_be_locked == 0), leading to
asserts popping when we go to do updates.

This patch hacks around this for now, until we can delete the offending
code.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Add rw to .key_invalid()
Kent Overstreet [Mon, 4 Apr 2022 01:50:25 +0000 (21:50 -0400)]
bcachefs: Add rw to .key_invalid()

This adds a new parameter to .key_invalid() methods for whether the key
is being read or written; the idea being that methods can do more
aggressive checks when a key is newly created and being written, when we
wouldn't want to delete the key because of those checks.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: More improvements for alloc info checks
Kent Overstreet [Tue, 5 Apr 2022 17:44:18 +0000 (13:44 -0400)]
bcachefs: More improvements for alloc info checks

 - Move checks for whether the device & bucket are valid from the
   .key_invalid method to bch2_check_alloc_key(). This is because
   .key_invalid() is called on keys that may no longer exist (post
   journal replay), which is a problem when removing/resizing devices.

 - We weren't checking the need_discard btree to ensure that every set
   bucket has a corresponding alloc key. This refactors the code for
   checking the freespace btree, so that it now checks both.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Silence spurious copygc err when shutting down
Kent Overstreet [Tue, 5 Apr 2022 03:36:56 +0000 (23:36 -0400)]
bcachefs: Silence spurious copygc err when shutting down

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Convert .key_invalid methods to printbufs
Kent Overstreet [Sun, 3 Apr 2022 21:50:01 +0000 (17:50 -0400)]
bcachefs: Convert .key_invalid methods to printbufs

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Gap buffer for journal keys
Kent Overstreet [Mon, 4 Apr 2022 05:09:26 +0000 (01:09 -0400)]
bcachefs: Gap buffer for journal keys

Btree updates before we go RW work by inserting into the array of keys
that journal replay will insert - but inserting into a flat array is
O(n), meaning if btree_gc needs to update many alloc keys, we're O(n^2).

Fortunately, the updates btree_gc does happens in sequential order,
which means a gap buffer works nicely here - this patch implements a gap
buffer for journal keys.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Don't normalize to pages in btree cache shrinker
Kent Overstreet [Mon, 4 Apr 2022 00:36:32 +0000 (20:36 -0400)]
bcachefs: Don't normalize to pages in btree cache shrinker

This behavior dates from the early, early days of bcache, and upon
further delving appears to not make any sense. The shrinker only works
in terms of 'objects' of unknown size; normalizing to pages only had the
effect of changing the batch size, which we could do directly - if we
wanted; we probably don't. Normalizing to pages meant our batch size was
very small, which seems to have been keeping us from doing as much
shrinking as we should be under heavy memory pressure; this patch
appears to alleviate some OOMs we've been seeing.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Add a tracepoint for superblock writes
Kent Overstreet [Sun, 3 Apr 2022 19:13:20 +0000 (15:13 -0400)]
bcachefs: Add a tracepoint for superblock writes

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: gc mark fn fixes, cleanups
Kent Overstreet [Sat, 2 Apr 2022 22:00:04 +0000 (18:00 -0400)]
bcachefs: gc mark fn fixes, cleanups

mark_stripe_bucket() was busted; it was using @new unitialized.

Also, clean up all the gc mark functions, and convert them to the same
style.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Don't write partially-initialized superblocks
Kent Overstreet [Sat, 2 Apr 2022 21:24:25 +0000 (17:24 -0400)]
bcachefs: Don't write partially-initialized superblocks

This neatly avoids bugs where we fail partway through initializing a new
filesystem, if we just don't write out partly-initialized state.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve read_from_stale_dirty_pointer() message
Kent Overstreet [Sat, 2 Apr 2022 20:57:29 +0000 (16:57 -0400)]
bcachefs: Improve read_from_stale_dirty_pointer() message

With printbufs, it's now easy to build up multi-line log messages and
emit them with one call, which is good because it prevents multiple
multi-line log messages from getting Interspersed in the log buffer;
this patch also improves the formatting and converts it to latest style.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Use crc_is_compressed()
Kent Overstreet [Fri, 1 Apr 2022 02:05:33 +0000 (22:05 -0400)]
bcachefs: Use crc_is_compressed()

Trivial cleanup.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix pr_buf() calls
Kent Overstreet [Sat, 2 Apr 2022 20:30:37 +0000 (16:30 -0400)]
bcachefs: Fix pr_buf() calls

In a few places we were passing a variable to pr_buf() for the format
string - oops.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Kill struct bucket_mark
Kent Overstreet [Mon, 14 Feb 2022 05:07:38 +0000 (00:07 -0500)]
bcachefs: Kill struct bucket_mark

This switches struct bucket to using a lock, instead of cmpxchg. And now
that the protected members no longer need to fit into a u64, we can
expand the sector counts to 32 bits.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Kill main in-memory bucket array
Kent Overstreet [Fri, 11 Feb 2022 00:26:55 +0000 (19:26 -0500)]
bcachefs: Kill main in-memory bucket array

All code using the in-memory bucket array, excluding GC, has now been
converted to use the alloc btree directly - so we can finally delete it.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: bch2_dev_usage_update() no longer depends on bucket_mark
Kent Overstreet [Fri, 11 Feb 2022 00:09:40 +0000 (19:09 -0500)]
bcachefs: bch2_dev_usage_update() no longer depends on bucket_mark

This is one of the last steps in getting rid of the main in-memory
bucket array.

This changes bch2_dev_usage_update() to take bkey_alloc_unpacked instead
of bucket_mark, and for the places where we are in fact working with
bucket_mark and don't have bkey_alloc_unpacked, we add a wrapper that
takes bucket_mark and converts to bkey_alloc_unpacked.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Fsck for need_discard & freespace btrees
Kent Overstreet [Thu, 17 Feb 2022 08:11:39 +0000 (03:11 -0500)]
bcachefs: Fsck for need_discard & freespace btrees

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: New bucket invalidate path
Kent Overstreet [Thu, 10 Feb 2022 23:18:41 +0000 (18:18 -0500)]
bcachefs: New bucket invalidate path

In the old allocator code, preparing an existing empty bucket was part
of the same code path that invalidated buckets containing cached data.
In the new allocator code this is no longer the case: the main allocator
path finds empty buckets (via the new freespace btree), and can't
allocate buckets that contain cached data.

We now need a separate code path to invalidate buckets containing cached
data when we're low on empty buckets, which this patch implements. When
the number of free buckets decreases that triggers the new invalidate
path to run, which uses the LRU btree to pick cached data buckets to
invalidate until we're above our watermark.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: New discard implementation
Kent Overstreet [Thu, 10 Feb 2022 09:32:19 +0000 (04:32 -0500)]
bcachefs: New discard implementation

In the old allocator code, buckets would be discarded just prior to
being used - this made sense in bcache where we were discarding buckets
just after invalidating the cached data they contain, but in a
filesystem where we typically have more free space we want to be
discarding buckets when they become empty.

This patch implements the new behaviour - it checks the need_discard
btree for buckets awaiting discards, and then clears the appropriate
bit in the alloc btree, which moves the buckets to the freespace btree.

Additionally, discards are now enabled by default.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Kill allocator threads & freelists
Kent Overstreet [Mon, 10 Jan 2022 01:48:31 +0000 (20:48 -0500)]
bcachefs: Kill allocator threads & freelists

Now that we have new persistent data structures for the allocator, this
patch converts the allocator to use them.

Now, foreground bucket allocation uses the freespace btree to find
buckets to allocate, instead of popping buckets off the freelist.

The background allocator threads are no longer needed and are deleted,
as well as the allocator freelists. Now we only need background tasks
for invalidating buckets containing cached data (when we are low on
empty buckets), and for issuing discards.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Freespace, need_discard btrees
Kent Overstreet [Sat, 11 Dec 2021 22:13:09 +0000 (17:13 -0500)]
bcachefs: Freespace, need_discard btrees

This adds two new btrees for the upcoming allocator rewrite: an extents
btree of free buckets, and a btree for buckets awaiting discards.

We also add a new trigger for alloc keys to keep the new btrees up to
date, and a compatibility path to initialize them on existing
filesystems.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: KEY_TYPE_alloc_v4
Kent Overstreet [Sat, 1 Jan 2022 01:03:29 +0000 (20:03 -0500)]
bcachefs: KEY_TYPE_alloc_v4

This introduces a new alloc key which doesn't use varints. Soon we'll be
adding backpointers and storing them in alloc keys, which means our
pack/unpack workflow for alloc keys won't really work - we'll need to be
mutating alloc keys in place.

Instead of bch2_alloc_unpack(), we now have bch2_alloc_to_v4() that
converts older types of alloc keys to v4 if needed.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: LRU btree
Kent Overstreet [Sun, 5 Dec 2021 05:31:54 +0000 (00:31 -0500)]
bcachefs: LRU btree

This implements new persistent LRUs, to be used for buckets containing
cached data, as well as stripes ordered by time when a block became
empty.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: KEY_TYPE_set
Kent Overstreet [Thu, 6 Jan 2022 03:13:13 +0000 (22:13 -0500)]
bcachefs: KEY_TYPE_set

A new empty key type, to be used when using a btree as a set.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: bch_sb_field_journal_v2
Kent Overstreet [Thu, 10 Mar 2022 21:43:52 +0000 (16:43 -0500)]
bcachefs: bch_sb_field_journal_v2

Add a new superblock field which represents journal buckets as ranges:
also move code for the superblock journal fields to journal_sb.c.

This also reworks the code for resizing the journal to write the new
superblock before using the new journal buckets, and thus be a bit
safer.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Run btree updates after write out of write_point
Kent Overstreet [Mon, 31 Oct 2022 20:13:05 +0000 (16:13 -0400)]
bcachefs: Run btree updates after write out of write_point

In the write path, after the write to the block device(s) complete we
have to punt to process context to do the btree update.

Instead of using the work item embedded in op->cl, this patch switches
to a per write-point work item. This helps with two different issues:

 - lock contention: btree updates to the same writepoint will (usually)
   be updating the same alloc keys
 - context switch overhead: when we're bottlenecked on btree updates,
   having a thread (running out of a work item) checking the write point
   for completed ops is cheaper than queueing up a new work item and
   waking up a kworker.

In an arbitrary benchmark, 4k random writes with fio running inside a
VM, this patch resulted in a 10% improvement in total iops.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: bch2_btree_update_start() refactoring
Kent Overstreet [Wed, 12 Jan 2022 04:24:43 +0000 (23:24 -0500)]
bcachefs: bch2_btree_update_start() refactoring

This simplifies the logic in bch2_btree_update_start() a bit, handling
the unlock/block logic more locally.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Introduce a separate journal watermark for copygc
Kent Overstreet [Tue, 15 Mar 2022 01:48:42 +0000 (21:48 -0400)]
bcachefs: Introduce a separate journal watermark for copygc

Since journal reclaim -> btree key cache flushing may require the
allocation of new btree nodes, it has an implicit dependency on copygc
in order to make forward progress - so we should avoid blocking copygc
unless the journal is really close to full.

This introduces watermarks to replace our single MAY_GET_UNRESERVED bit
in the journal, and adds a watermark for copygc and plumbs it through.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Copygc allocations shouldn't be nowait
Kent Overstreet [Tue, 15 Mar 2022 20:40:55 +0000 (16:40 -0400)]
bcachefs: Copygc allocations shouldn't be nowait

We don't actually want copygc allocations to be nowait - an allocation
for copygc might fail and then later succeed due to a bucket needing to
wait on journal commit, or to be discarded.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix bch2_journal_pin_set()
Kent Overstreet [Thu, 5 Jan 2023 15:13:37 +0000 (10:13 -0500)]
bcachefs: Fix bch2_journal_pin_set()

When bch2_journal_pin_set() is updating an existing pin, we shouldn't
call bch2_journal_reclaim_fast() after dropping the old pin and before
dropping the new pin - that could reclaim the entry we're trying to pin.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: x-macroize alloc_reserve enum
Kent Overstreet [Sun, 13 Mar 2022 23:27:55 +0000 (19:27 -0400)]
bcachefs: x-macroize alloc_reserve enum

This makes an array of strings available, like our other enums.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Run overwrite triggers before insert
Kent Overstreet [Thu, 31 Mar 2022 03:39:48 +0000 (23:39 -0400)]
bcachefs: Run overwrite triggers before insert

For backpointers, we'll need to delete old backpointers before adding
new backpointers - otherwise we'll run into spurious duplicate
backpointer errors.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Move deletion of refcount=0 indirect extents to their triggers
Kent Overstreet [Thu, 31 Mar 2022 04:03:37 +0000 (00:03 -0400)]
bcachefs: Move deletion of refcount=0 indirect extents to their triggers

For backpointers, we need to switch the order triggers are run in: we
need to run triggers for deletions/overwrites before triggers for
inserts.

To avoid breaking the reflink triggers, this patch moves deleting of
indirect extents with refcount=0 to their triggers, instead of doing it
when we update those keys.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Improve bch2_bkey_ptrs_to_text()
Kent Overstreet [Thu, 31 Mar 2022 03:40:19 +0000 (23:40 -0400)]
bcachefs: Improve bch2_bkey_ptrs_to_text()

Print bucket:offset when the filesystem is online; this makes debugging
easier when correlating with alloc updates.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: bch2_trans_log_msg()
Kent Overstreet [Wed, 30 Mar 2022 19:44:12 +0000 (15:44 -0400)]
bcachefs: bch2_trans_log_msg()

Add a new helper for logging messages to the journal - a new debugging
tool, an alternative to trace_printk().

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Use darray for extra_journal_entries
Kent Overstreet [Tue, 29 Mar 2022 20:29:10 +0000 (16:29 -0400)]
bcachefs: Use darray for extra_journal_entries

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: btree_path_make_mut() clears should_be_locked
Kent Overstreet [Wed, 30 Mar 2022 17:47:07 +0000 (13:47 -0400)]
bcachefs: btree_path_make_mut() clears should_be_locked

This fixes a bug where __bch2_btree_node_update_key() wasn't clearing
should_be_locked, leading to bch2_btree_path_traverse() always failing -
all callers of btree_path_make_mut() want should_be_locked cleared, so
do it there.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Add a missing btree_path_set_dirty() calls
Kent Overstreet [Wed, 30 Mar 2022 17:10:03 +0000 (13:10 -0400)]
bcachefs: Add a missing btree_path_set_dirty() calls

bch2_btree_iter_next_node() was mucking with other btree_path state
without setting path->update to be consistent with the fact that the
path is very much no longer uptodate - oops.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix error path in bch2_snapshot_set_equiv()
Kent Overstreet [Mon, 28 Mar 2022 20:31:26 +0000 (16:31 -0400)]
bcachefs: Fix error path in bch2_snapshot_set_equiv()

We weren't properly catching errors from snapshot_live() - oops.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Work around a journal self-deadlock
Kent Overstreet [Mon, 28 Mar 2022 20:21:26 +0000 (16:21 -0400)]
bcachefs: Work around a journal self-deadlock

bch2_journal_space_available -> bch2_journal_halt() self deadlocks on
journal lock; work around this by dropping/retaking journal lock before
we call bch2_fatal_error().

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Heap code fix
Kent Overstreet [Mon, 28 Mar 2022 16:31:22 +0000 (12:31 -0400)]
bcachefs: Heap code fix

When deleting an entry from a heap that was at entry h->used - 1, we'd
end up calling heap_sift() on an entry outside the heap - the entry we
just removed - which would end up re-adding it to the heap and deleting
something we didn't want to delete. Oops...

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix an unitialized var warning in userspace
Kent Overstreet [Mon, 21 Mar 2022 23:34:48 +0000 (19:34 -0400)]
bcachefs: Fix an unitialized var warning in userspace

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Add printf format attribute to bch2_pr_buf()
Kent Overstreet [Mon, 21 Mar 2022 22:05:39 +0000 (18:05 -0400)]
bcachefs: Add printf format attribute to bch2_pr_buf()

This tells the compiler to check printf format strings, and catches a
few bugs.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Reset journal flush delay to default value if zeroed
Kent Overstreet [Mon, 21 Mar 2022 07:03:03 +0000 (03:03 -0400)]
bcachefs: Reset journal flush delay to default value if zeroed

We've been seeing a very strange bug where journal flush & reclaim delay
end up getting inexplicably zeroed, in the superblock. We're now
validating all the options in bch2_validate_super(), and 0 is no longer
a valid value for those options, but we need to be careful not to
prevent people's filesystems from mounting because of the new
validation.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Change journal_io.c assertion to error message
Kent Overstreet [Mon, 21 Mar 2022 00:12:53 +0000 (20:12 -0400)]
bcachefs: Change journal_io.c assertion to error message

Something funny is going on with the new code for restoring the journal
write point, and it's hard to reproduce.

We do want to debug this because resuming writing to the journal in the
wrong spot could be something serious. For now, replace the assertion
with an error message and revert to old behaviour when it happens.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Make minimum journal_flush_delay nonzero
Kent Overstreet [Mon, 21 Mar 2022 04:27:10 +0000 (00:27 -0400)]
bcachefs: Make minimum journal_flush_delay nonzero

We're seeing a very strange bug where journal_flush_delay sometimes gets
set to 0 in the superblock. Together with the preceding patch, this
should help us track it down.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Better superblock opt validation
Kent Overstreet [Mon, 21 Mar 2022 04:15:38 +0000 (00:15 -0400)]
bcachefs: Better superblock opt validation

This moves validation of superblock options to bch2_sb_validate(), so
they'll be checked in the write path as well.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: x-macro metadata version enum
Kent Overstreet [Mon, 21 Mar 2022 03:34:11 +0000 (23:34 -0400)]
bcachefs: x-macro metadata version enum

Now we've got strings for metadata versions - this changes
bch2_sb_to_text() and our mount log message to use it.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix large key cache keys
Kent Overstreet [Fri, 18 Mar 2022 01:35:51 +0000 (21:35 -0400)]
bcachefs: Fix large key cache keys

Previously, we'd go into an infinite loop when attempting to cache a
bkey in the key cache larger than 128 u64s - since we were only using a
u8 for the size field, it'd get rounded up to 256 then truncated to 0.
Oops.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Convert some WARN_ONs to WARN_ON_ONCE
Kent Overstreet [Thu, 17 Mar 2022 00:31:15 +0000 (20:31 -0400)]
bcachefs: Convert some WARN_ONs to WARN_ON_ONCE

These warnings are symptomatic of something else going wrong, we don't
want them spamming up the logs as that'll make it harder to find the
real issue.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Restore journal write point at startup
Kent Overstreet [Tue, 15 Mar 2022 06:41:21 +0000 (02:41 -0400)]
bcachefs: Restore journal write point at startup

This patch tweaks the journal recovery path so that we start writing
right after where we left off, instead of the next empty bucket. This is
partly prep work for supporting zoned devices, but it's also good to do
in general to avoid the journal completely filling up and getting stuck.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: darrays
Kent Overstreet [Tue, 29 Mar 2022 19:48:45 +0000 (15:48 -0400)]
bcachefs: darrays

Inspired by CCAN darray - simple, stupid resizable (dynamic) arrays.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix BTREE_TRIGGER_WANTS_OLD_AND_NEW
Kent Overstreet [Sun, 13 Mar 2022 05:30:16 +0000 (00:30 -0500)]
bcachefs: Fix BTREE_TRIGGER_WANTS_OLD_AND_NEW

BTREE_TRIGGER_WANTS_OLD_AND_NEW didn't work correctly when the old and
new key were both alloc keys, but different versions - it required old
and new key type to be identical, and this bug is a problem for the new
allocator rewrite.

This patch fixes it by checking if the old and new key have the same
trigger functions - the different versions of alloc (and inode) keys
have the same trigger functions.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Move trigger fns to bkey_ops
Kent Overstreet [Sun, 13 Mar 2022 05:26:52 +0000 (00:26 -0500)]
bcachefs: Move trigger fns to bkey_ops

This replaces the switch statements in bch2_mark_key(),
bch2_trans_mark_key() with new bkey methods - prep work for the next
patch, which fixes BTREE_TRIGGER_WANTS_OLD_AND_NEW.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Revalidate pointer to old bkey val before calling mem triggers
Kent Overstreet [Sat, 12 Mar 2022 21:14:55 +0000 (16:14 -0500)]
bcachefs: Revalidate pointer to old bkey val before calling mem triggers

We recently started stashing a copy of the key being overwritten in
btree_insert_entry: this is helpful for avoiding multiple calls to
bch2_btree_path_peek_slot() and bch2_journal_keys_peek() in the
transaction commit path.

But it turns out this has a problem - when we run mem/atomic triggers,
we've done a couple things that can invalidate the pointer to the old
key's value. This makes the optimization of stashing a pointer to the
old value questionable, but for now this patch revalidates that pointer
before running mem triggers.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: bch2_trans_updates_to_text()
Kent Overstreet [Fri, 11 Mar 2022 23:38:24 +0000 (18:38 -0500)]
bcachefs: bch2_trans_updates_to_text()

This turns bch2_dump_trans_updates() into a to_text() method - this way
it can be used by debug tracing.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: bch2_trans_inconsistent()
Kent Overstreet [Thu, 3 Mar 2022 03:18:56 +0000 (22:18 -0500)]
bcachefs: bch2_trans_inconsistent()

Add a new error macro that also dumps transaction updates in addition to
doing an emergency shutdown - when a transaction update discovers or is
causing a fs inconsistency, it's helpful to see what updates it was
doing.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Drop !did_work path from do_btree_insert_one()
Kent Overstreet [Fri, 11 Mar 2022 23:16:42 +0000 (18:16 -0500)]
bcachefs: Drop !did_work path from do_btree_insert_one()

As we've already reserved space in the journal this optimization doesn't
actually buy us anything, and when doing list_journal debugging it
deletes information we want.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: bch2_btree_iter_peek_upto()
Kent Overstreet [Fri, 11 Mar 2022 17:31:52 +0000 (12:31 -0500)]
bcachefs: bch2_btree_iter_peek_upto()

In BTREE_ITER_FILTER_SNAPHOTS mode, we skip over keys in unrelated
snapshots. When we hit the end of an inode, if the next inode(s) are in
a different subvolume, we could potentially have to skip past many keys
before finding a key we can return to the caller, so they can terminate
the iteration.

This adds a peek_upto() variant to solve this problem, to be used when
we know the range we're searching within.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Delay setting path->should_be_locked
Kent Overstreet [Fri, 11 Mar 2022 04:22:49 +0000 (23:22 -0500)]
bcachefs: Delay setting path->should_be_locked

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
11 months agobcachefs: Add a missing wakeup
Kent Overstreet [Thu, 10 Mar 2022 22:35:06 +0000 (17:35 -0500)]
bcachefs: Add a missing wakeup

This fixes a rare bug with bch2_btree_flush_all_writes() getting stuck.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Allocate journal buckets sequentially
Kent Overstreet [Thu, 10 Mar 2022 20:49:03 +0000 (15:49 -0500)]
bcachefs: Allocate journal buckets sequentially

This tweaks __bch2_set_nr_journal_buckets() so that we aren't reversing
their order in the jorunal anymore - nice for rotating disks.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: bch2_journal_log_msg()
Kent Overstreet [Thu, 10 Mar 2022 19:25:16 +0000 (14:25 -0500)]
bcachefs: bch2_journal_log_msg()

This adds bch2_journal_log_msg(), which just logs a message to the
journal, and uses it to mark startup and when journal replay finishes.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Change flags param to bch2_btree_delete_range to update_flags
Kent Overstreet [Sat, 5 Mar 2022 23:23:47 +0000 (18:23 -0500)]
bcachefs: Change flags param to bch2_btree_delete_range to update_flags

It wasn't used as iter_flags (excepting the unit tests, which this patch
fixes), and the next patch is going to need to pass in
BTREE_TRIGGER_NORUN.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix lock ordering under traverse_all()
Kent Overstreet [Mon, 7 Mar 2022 02:17:43 +0000 (21:17 -0500)]
bcachefs: Fix lock ordering under traverse_all()

traverse_all() traverses btree paths in sorted order, so it should never
see transaction restarts due to lock ordering violations. But some code
in __bch2_btree_path_upgrade(), while necessary when not running under
traverse_all(), was causing some confusing lock ordering violations -
disabling this code under traverse_all() will let us put in some more
assertions.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
11 months agobcachefs: Fix error handling in traverse_all()
Kent Overstreet [Tue, 8 Mar 2022 03:05:49 +0000 (22:05 -0500)]
bcachefs: Fix error handling in traverse_all()

In btree_path_traverse_all() we were failing to check for -EIO in the
retry loop, and after btree node read error we'd go into an infinite
loop.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>