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btrfs: use assertion helpers for spinning writers

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Use the helpers where open coded. On non-debug builds, the warnings will
not trigger and extent_buffer::spining_writers become unused and can be
moved to the appropriate section, saving a few bytes.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2018-08-24 14:56:28 +02:00
parent e4e9fd0f32
commit 843ccf9f46
3 changed files with 11 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

16
fs/btrfs/locking.c
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@ -64,8 +64,7 @@ void btrfs_set_lock_blocking_write(struct extent_buffer *eb)
if (eb->lock_nested && current->pid == eb->lock_owner)
return;
if (atomic_read(&eb->blocking_writers) == 0) {
WARN_ON(atomic_read(&eb->spinning_writers) != 1);
atomic_dec(&eb->spinning_writers);
btrfs_assert_spinning_writers_put(eb);
btrfs_assert_tree_locked(eb);
atomic_inc(&eb->blocking_writers);
write_unlock(&eb->lock);
@ -101,8 +100,7 @@ void btrfs_clear_lock_blocking_write(struct extent_buffer *eb)
return;
BUG_ON(atomic_read(&eb->blocking_writers) != 1);
write_lock(&eb->lock);
WARN_ON(atomic_read(&eb->spinning_writers));
atomic_inc(&eb->spinning_writers);
btrfs_assert_spinning_writers_get(eb);
/* atomic_dec_and_test implies a barrier */
if (atomic_dec_and_test(&eb->blocking_writers))
cond_wake_up_nomb(&eb->write_lock_wq);
@ -200,7 +198,7 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
return 0;
}
atomic_inc(&eb->write_locks);
atomic_inc(&eb->spinning_writers);
btrfs_assert_spinning_writers_get(eb);
eb->lock_owner = current->pid;
return 1;
}
@ -266,8 +264,7 @@ again:
write_unlock(&eb->lock);
goto again;
}
WARN_ON(atomic_read(&eb->spinning_writers));
atomic_inc(&eb->spinning_writers);
btrfs_assert_spinning_writers_get(eb);
atomic_inc(&eb->write_locks);
eb->lock_owner = current->pid;
}
@ -286,14 +283,13 @@ void btrfs_tree_unlock(struct extent_buffer *eb)
atomic_dec(&eb->write_locks);
if (blockers) {
WARN_ON(atomic_read(&eb->spinning_writers));
btrfs_assert_no_spinning_writers(eb);
atomic_dec(&eb->blocking_writers);
/* Use the lighter barrier after atomic */
smp_mb__after_atomic();
cond_wake_up_nomb(&eb->write_lock_wq);
} else {
WARN_ON(atomic_read(&eb->spinning_writers) != 1);
atomic_dec(&eb->spinning_writers);
btrfs_assert_spinning_writers_put(eb);
write_unlock(&eb->lock);
}
}