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fs: replace f_rcuhead with f_task_work

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The naming is actively misleading since we switched to
SLAB_TYPESAFE_BY_RCU. rcu_head is #define callback_head. Use
callback_head directly and rename f_rcuhead to f_task_work.

Add comments in there to explain what it's used for.

Link: https://lore.kernel.org/r/20231130-vfs-files-fixes-v1-3-e73ca6f4ea83@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2023-11-30 13:49:09 +01:00
parent 24fa3ae946
commit 372a34e66f
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GPG key ID: 91C61BC06578DCA2
2 changed files with 6 additions and 4 deletions
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6
fs/file_table.c
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@ -407,7 +407,7 @@ static void delayed_fput(struct work_struct *unused)
static void ____fput(struct callback_head *work)
{
__fput(container_of(work, struct file, f_rcuhead));
__fput(container_of(work, struct file, f_task_work));
}
/*
@ -438,8 +438,8 @@ void fput(struct file *file)
return;
}
if (likely(!in_interrupt() && !(task->flags & PF_KTHREAD))) {
init_task_work(&file->f_rcuhead, ____fput);
if (!task_work_add(task, &file->f_rcuhead, TWA_RESUME))
init_task_work(&file->f_task_work, ____fput);
if (!task_work_add(task, &file->f_task_work, TWA_RESUME))
return;
/*
* After this task has run exit_task_work(),

4
include/linux/fs.h
View file

@ -991,8 +991,10 @@ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
*/
struct file {
union {
/* fput() uses task work when closing and freeing file (default). */
struct callback_head f_task_work;
/* fput() must use workqueue (most kernel threads). */
struct llist_node f_llist;
struct rcu_head f_rcuhead;
unsigned int f_iocb_flags;
};