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inode: port __I_NEW to var event

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

Link: https://lore.kernel.org/r/20240823-work-i_state-v3-4-5cd5fd207a57@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 14:47:38 +02:00
parent 532980cb1b
commit 0fe340a98b
4 changed files with 38 additions and 14 deletions
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10
fs/bcachefs/fs.c
View File

@ -1644,14 +1644,16 @@ again:
break;
}
} else if (clean_pass && this_pass_clean) {
wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW);
DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
struct wait_bit_queue_entry wqe;
struct wait_queue_head *wq_head;
prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
wq_head = inode_bit_waitqueue(&wqe, &inode->v, __I_NEW);
prepare_to_wait_event(wq_head, &wqe.wq_entry,
TASK_UNINTERRUPTIBLE);
mutex_unlock(&c->vfs_inodes_lock);
schedule();
finish_wait(wq, &wait.wq_entry);
finish_wait(wq_head, &wqe.wq_entry);
goto again;
}
}

7
fs/dcache.c
View File

@ -1908,8 +1908,13 @@ void d_instantiate_new(struct dentry *entry, struct inode *inode)
__d_instantiate(entry, inode);
WARN_ON(!(inode->i_state & I_NEW));
inode->i_state &= ~I_NEW & ~I_CREATING;
/*
* Pairs with the barrier in prepare_to_wait_event() to make sure
* ___wait_var_event() either sees the bit cleared or
* waitqueue_active() check in wake_up_var() sees the waiter.
*/
smp_mb();
wake_up_bit(&inode->i_state, __I_NEW);
inode_wake_up_bit(inode, __I_NEW);
spin_unlock(&inode->i_lock);
}
EXPORT_SYMBOL(d_instantiate_new);

32
fs/inode.c
View File

@ -734,7 +734,13 @@ static void evict(struct inode *inode)
* used as an indicator whether blocking on it is safe.
*/
spin_lock(&inode->i_lock);
wake_up_bit(&inode->i_state, __I_NEW);
/*
* Pairs with the barrier in prepare_to_wait_event() to make sure
* ___wait_var_event() either sees the bit cleared or
* waitqueue_active() check in wake_up_var() sees the waiter.
*/
smp_mb();
inode_wake_up_bit(inode, __I_NEW);
BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
spin_unlock(&inode->i_lock);
@ -1146,8 +1152,13 @@ void unlock_new_inode(struct inode *inode)
spin_lock(&inode->i_lock);
WARN_ON(!(inode->i_state & I_NEW));
inode->i_state &= ~I_NEW & ~I_CREATING;
/*
* Pairs with the barrier in prepare_to_wait_event() to make sure
* ___wait_var_event() either sees the bit cleared or
* waitqueue_active() check in wake_up_var() sees the waiter.
*/
smp_mb();
wake_up_bit(&inode->i_state, __I_NEW);
inode_wake_up_bit(inode, __I_NEW);
spin_unlock(&inode->i_lock);
}
EXPORT_SYMBOL(unlock_new_inode);
@ -1158,8 +1169,13 @@ void discard_new_inode(struct inode *inode)
spin_lock(&inode->i_lock);
WARN_ON(!(inode->i_state & I_NEW));
inode->i_state &= ~I_NEW;
/*
* Pairs with the barrier in prepare_to_wait_event() to make sure
* ___wait_var_event() either sees the bit cleared or
* waitqueue_active() check in wake_up_var() sees the waiter.
*/
smp_mb();
wake_up_bit(&inode->i_state, __I_NEW);
inode_wake_up_bit(inode, __I_NEW);
spin_unlock(&inode->i_lock);
iput(inode);
}
@ -2348,8 +2364,8 @@ EXPORT_SYMBOL(inode_needs_sync);
*/
static void __wait_on_freeing_inode(struct inode *inode, bool is_inode_hash_locked)
{
wait_queue_head_t *wq;
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW);
struct wait_bit_queue_entry wqe;
struct wait_queue_head *wq_head;
/*
* Handle racing against evict(), see that routine for more details.
@ -2360,14 +2376,14 @@ static void __wait_on_freeing_inode(struct inode *inode, bool is_inode_hash_lock
return;
}
wq = bit_waitqueue(&inode->i_state, __I_NEW);
prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
wq_head = inode_bit_waitqueue(&wqe, inode, __I_NEW);
prepare_to_wait_event(wq_head, &wqe.wq_entry, TASK_UNINTERRUPTIBLE);
spin_unlock(&inode->i_lock);
rcu_read_unlock();
if (is_inode_hash_locked)
spin_unlock(&inode_hash_lock);
schedule();
finish_wait(wq, &wait.wq_entry);
finish_wait(wq_head, &wqe.wq_entry);
if (is_inode_hash_locked)
spin_lock(&inode_hash_lock);
rcu_read_lock();

3
include/linux/writeback.h
View File

@ -200,7 +200,8 @@ void inode_io_list_del(struct inode *inode);
/* writeback.h requires fs.h; it, too, is not included from here. */
static inline void wait_on_inode(struct inode *inode)
{
wait_on_bit(&inode->i_state, __I_NEW, TASK_UNINTERRUPTIBLE);
wait_var_event(inode_state_wait_address(inode, __I_NEW),
!(READ_ONCE(inode->i_state) & I_NEW));
}
#ifdef CONFIG_CGROUP_WRITEBACK