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inode: port __I_SYNC to var event

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Port the __I_SYNC mechanism to use the new var event mechanism.

Link: https://lore.kernel.org/r/20240823-work-i_state-v3-3-5cd5fd207a57@kernel.org
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-08-23 14:47:37 +02:00
parent 2ed634c96e
commit 532980cb1b
1 changed files with 29 additions and 16 deletions
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45
fs/fs-writeback.c
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@ -1386,12 +1386,13 @@ static void requeue_io(struct inode *inode, struct bdi_writeback *wb)
static void inode_sync_complete(struct inode *inode)
{
assert_spin_locked(&inode->i_lock);
inode->i_state &= ~I_SYNC;
/* If inode is clean an unused, put it into LRU now... */
inode_add_lru(inode);
/* Waiters must see I_SYNC cleared before being woken up */
smp_mb();
wake_up_bit(&inode->i_state, __I_SYNC);
/* Called with inode->i_lock which ensures memory ordering. */
inode_wake_up_bit(inode, __I_SYNC);
}
static bool inode_dirtied_after(struct inode *inode, unsigned long t)
@ -1512,17 +1513,25 @@ static int write_inode(struct inode *inode, struct writeback_control *wbc)
*/
void inode_wait_for_writeback(struct inode *inode)
{
DEFINE_WAIT_BIT(wq, &inode->i_state, __I_SYNC);
wait_queue_head_t *wqh;
struct wait_bit_queue_entry wqe;
struct wait_queue_head *wq_head;
lockdep_assert_held(&inode->i_lock);
wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
while (inode->i_state & I_SYNC) {
assert_spin_locked(&inode->i_lock);
if (!(inode->i_state & I_SYNC))
return;
wq_head = inode_bit_waitqueue(&wqe, inode, __I_SYNC);
for (;;) {
prepare_to_wait_event(wq_head, &wqe.wq_entry, TASK_UNINTERRUPTIBLE);
/* Checking I_SYNC with inode->i_lock guarantees memory ordering. */
if (!(inode->i_state & I_SYNC))
break;
spin_unlock(&inode->i_lock);
__wait_on_bit(wqh, &wq, bit_wait,
TASK_UNINTERRUPTIBLE);
schedule();
spin_lock(&inode->i_lock);
}
finish_wait(wq_head, &wqe.wq_entry);
}
/*
@ -1533,16 +1542,20 @@ void inode_wait_for_writeback(struct inode *inode)
static void inode_sleep_on_writeback(struct inode *inode)
__releases(inode->i_lock)
{
DEFINE_WAIT(wait);
wait_queue_head_t *wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
int sleep;
struct wait_bit_queue_entry wqe;
struct wait_queue_head *wq_head;
bool sleep;
prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
sleep = inode->i_state & I_SYNC;
assert_spin_locked(&inode->i_lock);
wq_head = inode_bit_waitqueue(&wqe, inode, __I_SYNC);
prepare_to_wait_event(wq_head, &wqe.wq_entry, TASK_UNINTERRUPTIBLE);
/* Checking I_SYNC with inode->i_lock guarantees memory ordering. */
sleep = !!(inode->i_state & I_SYNC);
spin_unlock(&inode->i_lock);
if (sleep)
schedule();
finish_wait(wqh, &wait);
finish_wait(wq_head, &wqe.wq_entry);
}
/*