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btrfs: use assertion helpers for extent buffer read lock counters 

Use the helpers where open coded. On non-debug builds, the warnings will
not trigger and extent_buffer::read_locks 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 16:15:51 +02:00
parent 58a2ddaedb
commit 5c9c799ab7
3 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/btrfs/extent_io.c
View File

@ -4678,7 +4678,6 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
eb->bflags = 0;
rwlock_init(&eb->lock);
atomic_set(&eb->write_locks, 0);
atomic_set(&eb->read_locks, 0);
atomic_set(&eb->blocking_readers, 0);
atomic_set(&eb->blocking_writers, 0);
eb->lock_nested = 0;
@ -4701,6 +4700,7 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
#ifdef CONFIG_BTRFS_DEBUG
atomic_set(&eb->spinning_writers, 0);
atomic_set(&eb->spinning_readers, 0);
atomic_set(&eb->read_locks, 0);
#endif
return eb;

2
fs/btrfs/extent_io.h
View File

@ -162,7 +162,6 @@ struct extent_buffer {
/* count of read lock holders on the extent buffer */
atomic_t write_locks;
atomic_t read_locks;
atomic_t blocking_writers;
atomic_t blocking_readers;
short lock_nested;
@ -185,6 +184,7 @@ struct extent_buffer {
#ifdef CONFIG_BTRFS_DEBUG
atomic_t spinning_writers;
atomic_t spinning_readers;
atomic_t read_locks;
struct list_head leak_list;
#endif
};

10
fs/btrfs/locking.c
View File

@ -164,7 +164,7 @@ again:
atomic_read(&eb->blocking_writers) == 0);
goto again;
}
atomic_inc(&eb->read_locks);
btrfs_assert_tree_read_locks_get(eb);
btrfs_assert_spinning_readers_get(eb);
}
@ -183,7 +183,7 @@ int btrfs_tree_read_lock_atomic(struct extent_buffer *eb)
read_unlock(&eb->lock);
return 0;
}
atomic_inc(&eb->read_locks);
btrfs_assert_tree_read_locks_get(eb);
btrfs_assert_spinning_readers_get(eb);
return 1;
}
@ -204,7 +204,7 @@ int btrfs_try_tree_read_lock(struct extent_buffer *eb)
read_unlock(&eb->lock);
return 0;
}
atomic_inc(&eb->read_locks);
btrfs_assert_tree_read_locks_get(eb);
btrfs_assert_spinning_readers_get(eb);
return 1;
}
@ -248,7 +248,7 @@ void btrfs_tree_read_unlock(struct extent_buffer *eb)
}
btrfs_assert_tree_read_locked(eb);
btrfs_assert_spinning_readers_put(eb);
atomic_dec(&eb->read_locks);
btrfs_assert_tree_read_locks_put(eb);
read_unlock(&eb->lock);
}
@ -272,7 +272,7 @@ void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb)
/* atomic_dec_and_test implies a barrier */
if (atomic_dec_and_test(&eb->blocking_readers))
cond_wake_up_nomb(&eb->read_lock_wq);
atomic_dec(&eb->read_locks);
btrfs_assert_tree_read_locks_put(eb);
}
/*