Commit Graph

9 Commits

Author SHA1 Message Date
Josef Bacik
734d8c15df btrfs: add a comment describing block reserves
This is a giant comment at the top of block-rsv.c describing generally
how block reserves work.  It is purely about the block reserves
themselves, and nothing to do with how the actual reservation system
works.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2020-03-23 17:01:26 +01:00
Josef Bacik
426551f686 btrfs: use btrfs_try_granting_tickets in update_global_rsv
We have some annoying xfstests tests that will create a very small fs,
fill it up, delete it, and repeat to make sure everything works right.
This trips btrfs up sometimes because we may commit a transaction to
free space, but most of the free metadata space was being reserved by
the global reserve.  So we commit and update the global reserve, but the
space is simply added to bytes_may_use directly, instead of trying to
add it to existing tickets.  This results in ENOSPC when we really did
have space.  Fix this by calling btrfs_try_granting_tickets once we add
back our excess space to wake any pending tickets.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-09-09 14:59:19 +02:00
Josef Bacik
d792b0f197 btrfs: always reserve our entire size for the global reserve
While messing with the overcommit logic I noticed that sometimes we'd
ENOSPC out when really we should have run out of space much earlier.  It
turns out it's because we'll only reserve up to the free amount left in
the space info for the global reserve, but that doesn't make sense with
overcommit because we could be well above our actual size.  This results
in the global reserve not carving out it's entire reservation, and thus
not putting enough pressure on the rest of the infrastructure to do the
right thing and ENOSPC out at a convenient time.  Fix this by always
taking our full reservation amount for the global reserve.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-09-09 14:59:19 +02:00
Josef Bacik
3593ce30b5 btrfs: change the minimum global reserve size
It made sense to have the global reserve set at 16M in the past, but
since it is used less nowadays set the minimum size to the number of
items we'll need to update the main trees we update during a transaction
commit, plus some slop area so we can do unlinks if we need to.

In practice this doesn't affect normal file systems, but for xfstests
where we do things like fill up a fs and then rm * it can fall over in
weird ways.  This enables us for more sane behavior at extremely small
file system sizes.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-09-09 14:59:18 +02:00
Josef Bacik
d05e46497f btrfs: rename btrfs_space_info_add_old_bytes
This name doesn't really fit with how the space reservation stuff works
now, rename it to btrfs_space_info_free_bytes_may_use so it's clear what
the function is doing.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-09-09 14:59:18 +02:00
Josef Bacik
f3e75e3805 btrfs: roll tracepoint into btrfs_space_info_update helper
We duplicate this tracepoint everywhere we call these helpers, so update
the helper to have the tracepoint as well.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-09-09 14:59:17 +02:00
David Sterba
784352fe0b btrfs: move math functions to misc.h
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-09-09 14:59:15 +02:00
Josef Bacik
67f9c2209e btrfs: migrate the global_block_rsv helpers to block-rsv.c
These helpers belong in block-rsv.c

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-02 12:30:55 +02:00
Josef Bacik
550fa228ee btrfs: migrate the block-rsv code to block-rsv.c
This moves everything out of extent-tree.c to block-rsv.c.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-02 12:30:54 +02:00