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Btrfs: cleanup code of btrfs_balance_delayed_items() 

- move the condition check for wait into a function
- use wait_event_interruptible instead of prepare-schedule-finish process

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Miao Xie 2013-12-26 13:07:03 +08:00 committed by Chris Mason
parent 4dd466d36a
commit 0353808cae
1 changed files with 11 additions and 23 deletions
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34
fs/btrfs/delayed-inode.c
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@ -1349,52 +1349,40 @@ void btrfs_assert_delayed_root_empty(struct btrfs_root *root)
WARN_ON(btrfs_first_delayed_node(delayed_root)); WARN_ON(btrfs_first_delayed_node(delayed_root));
} }
static int refs_newer(struct btrfs_delayed_root *delayed_root, static int could_end_wait(struct btrfs_delayed_root *delayed_root, int seq)
int seq, int count)
{ {
int val = atomic_read(&delayed_root->items_seq); int val = atomic_read(&delayed_root->items_seq);
if (val < seq || val >= seq + count) if (val < seq || val >= seq + BTRFS_DELAYED_BATCH)
return 1; return 1;
if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
return 1;
return 0; return 0;
} }
void btrfs_balance_delayed_items(struct btrfs_root *root) void btrfs_balance_delayed_items(struct btrfs_root *root)
{ {
struct btrfs_delayed_root *delayed_root; struct btrfs_delayed_root *delayed_root;
int seq;
delayed_root = btrfs_get_delayed_root(root); delayed_root = btrfs_get_delayed_root(root);
if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND) if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
return; return;
seq = atomic_read(&delayed_root->items_seq);
if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) { if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
int seq;
int ret; int ret;
DEFINE_WAIT(__wait);
seq = atomic_read(&delayed_root->items_seq);
ret = btrfs_wq_run_delayed_node(delayed_root, root, 0); ret = btrfs_wq_run_delayed_node(delayed_root, root, 0);
if (ret) if (ret)
return; return;
while (1) { wait_event_interruptible(delayed_root->wait,
prepare_to_wait(&delayed_root->wait, &__wait, could_end_wait(delayed_root, seq));
TASK_INTERRUPTIBLE);
if (refs_newer(delayed_root, seq,
BTRFS_DELAYED_BATCH) ||
atomic_read(&delayed_root->items) <
BTRFS_DELAYED_BACKGROUND) {
break;
}
if (!signal_pending(current))
schedule();
else
break;
}
finish_wait(&delayed_root->wait, &__wait);
return; return;
} }