The continue statement in bch2_trans_mark_extent() was wrong - by
bailing out early, we'd be constructing the wrong replicas list to
update. Also, the assertion in update_replicas() was wrong - due to
rounding with compressed extents, it is possible for sectors to be 0
sometimes.

Also, change extent_to_replicas() in replicas.c to match the replicas
list we construct in buckets.c.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Major simplification - gets rid of the need for marking buckets as
dirty, instead we write buckets if the in memory mark is different from
what's in the btree.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This fixes a bug in the journal replay -> extent_replay_key ->
split_compressed path, when we do an update that changes alloc info but
the alloc info in the btree isn't up to date yet.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Reflink caused fiemap performance to regress badly - this gets us back
to where we were.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This way we aren't doing a full linear scan every time we create a new
stripe.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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

It's only updating timestamps, so this doubly doesn't make sense. fsync
will flush the journal, if necessary.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

*i is used as an output parameter, but gcc isn't noticing that. Oh well.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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

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

Also, move other update path checks to where they actually check all the
updates (after triggers have run)
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Also - fix alignment in bch2_set_page_dirty()
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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

We have to reinitialize ptrs whenever we do something that changes them.
Regression from when the code was converted to be generic across all
keys with pointers.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bch2_bkey_normalize() modifies the value, and we were modifying the
original value in the src btree node - but, we're called without a write
lock held on the src node. Oops...
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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

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

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

bch2_btree_node_iter_prev_all() depends on an invariant that wasn't
being maintained for extent leaf nodes - specifically, the node iterator
may not have advanced past any keys that compare after the key the node
iterator points to.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bch2_btree_node_iter_prev_filter() tried to be smart about iterating
backwards when skipping over whiteouts/discards - but unfortunately,
doing so can leave the node iterator in an inconsistent state; the sane
solution is to just always iterate backwards one key at a time.

But we compact btree nodes when more than a quarter of the keys are
whiteouts/discards, so the optimization wasn't buying us that much
anyways.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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

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

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

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

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

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

More prep work for reflink: for extents, we're not looking for an exact
mach on pos, rather that the pos is within the range of the key the
iterator points to.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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

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

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

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

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

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

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

With reflink, various code now has to handle both KEY_TYPE_extent
or KEY_TYPE_reflink_v - so, convert it to be generic across all keys
with pointers.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Minor cleanup - prep work for new key types for reflink
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Prep work for reflink - for reflink, we're going to be using
bch2_extent_update() with other updates in the same transaction.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Where unlink_on_commit is used, on unsuccessfull commit we're likely
retrying the whole update and were going to be using the same iterators
again.

The management of multiple iterators needs to be gone over a fair bit
more at some point...
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

for_each_btree_key() calls bch2_trans_get_iter() - we have to reset the
transaction state before getting the iterator again, in the retry path
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

With reflink, we'll no longer be able to calculate the offset of the
data we want into the extent we're reading from from the extent pos and
the iter pos - we'll have to pass it in separately.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>