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nilfs2: use kthread_create and kthread_stop for the log writer thread

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By using kthread_create() and kthread_stop() to start and stop the log
writer thread, eliminate custom thread start and stop helpers, as well as
the wait queue "sc_wait_task" on the "nilfs_sc_info" struct and
NILFS_SEGCTOR_QUIT flag that exist only to implement them.

Also, update the kernel doc comments of the changed functions as
appropriate.

Link: https://lkml.kernel.org/r/20240826174116.5008-8-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: Huang Xiaojia <huangxiaojia2@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ryusuke Konishi 2024-08-27 02:41:15 +09:00 committed by Andrew Morton
parent cfdfe9e17c
commit 3f66cc261c
2 changed files with 31 additions and 54 deletions
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82
fs/nilfs2/segment.c
View File

@ -2628,11 +2628,15 @@ static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
}
/**
* nilfs_segctor_thread - main loop of the segment constructor thread.
* nilfs_segctor_thread - main loop of the log writer thread
* @arg: pointer to a struct nilfs_sc_info.
*
* nilfs_segctor_thread() initializes a timer and serves as a daemon
* to execute segment constructions.
* nilfs_segctor_thread() is the main loop function of the log writer kernel
* thread, which determines whether log writing is necessary, and if so,
* performs the log write in the background, or waits if not. It is also
* used to decide the background writeback of the superblock.
*
* Return: Always 0.
*/
static int nilfs_segctor_thread(void *arg)
{
@ -2640,11 +2644,6 @@ static int nilfs_segctor_thread(void *arg)
struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
int timeout = 0;
timer_setup(&sci->sc_timer, nilfs_construction_timeout, 0);
/* start sync. */
sci->sc_task = current;
wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
nilfs_info(sci->sc_super,
"segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds",
sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
@ -2655,7 +2654,7 @@ static int nilfs_segctor_thread(void *arg)
for (;;) {
int mode;
if (sci->sc_state & NILFS_SEGCTOR_QUIT)
if (kthread_should_stop())
goto end_thread;
if (timeout || sci->sc_seq_request != sci->sc_seq_done)
@ -2709,41 +2708,10 @@ static int nilfs_segctor_thread(void *arg)
/* end sync. */
sci->sc_task = NULL;
timer_shutdown_sync(&sci->sc_timer);
wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
spin_unlock(&sci->sc_state_lock);
return 0;
}
static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
{
struct task_struct *t;
t = kthread_run(nilfs_segctor_thread, sci, "segctord");
if (IS_ERR(t)) {
int err = PTR_ERR(t);
nilfs_err(sci->sc_super, "error %d creating segctord thread",
err);
return err;
}
wait_event(sci->sc_wait_task, sci->sc_task != NULL);
return 0;
}
static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
__acquires(&sci->sc_state_lock)
__releases(&sci->sc_state_lock)
{
sci->sc_state |= NILFS_SEGCTOR_QUIT;
while (sci->sc_task) {
wake_up(&sci->sc_wait_daemon);
spin_unlock(&sci->sc_state_lock);
wait_event(sci->sc_wait_task, sci->sc_task == NULL);
spin_lock(&sci->sc_state_lock);
}
}
/*
* Setup & clean-up functions
*/
@ -2764,7 +2732,6 @@ static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
init_waitqueue_head(&sci->sc_wait_request);
init_waitqueue_head(&sci->sc_wait_daemon);
init_waitqueue_head(&sci->sc_wait_task);
spin_lock_init(&sci->sc_state_lock);
INIT_LIST_HEAD(&sci->sc_dirty_files);
INIT_LIST_HEAD(&sci->sc_segbufs);
@ -2819,8 +2786,12 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
up_write(&nilfs->ns_segctor_sem);
if (sci->sc_task) {
wake_up(&sci->sc_wait_daemon);
kthread_stop(sci->sc_task);
}
spin_lock(&sci->sc_state_lock);
nilfs_segctor_kill_thread(sci);
flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
|| sci->sc_seq_request != sci->sc_seq_done);
spin_unlock(&sci->sc_state_lock);
@ -2868,14 +2839,15 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
* This allocates a log writer object, initializes it, and starts the
* log writer.
*
* Return Value: On success, 0 is returned. On error, one of the following
* negative error code is returned.
*
* %-ENOMEM - Insufficient memory available.
* Return: 0 on success, or the following negative error code on failure.
* * %-EINTR - Log writer thread creation failed due to interruption.
* * %-ENOMEM - Insufficient memory available.
*/
int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
{
struct the_nilfs *nilfs = sb->s_fs_info;
struct nilfs_sc_info *sci;
struct task_struct *t;
int err;
if (nilfs->ns_writer) {
@ -2888,15 +2860,23 @@ int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
return 0;
}
nilfs->ns_writer = nilfs_segctor_new(sb, root);
if (!nilfs->ns_writer)
sci = nilfs_segctor_new(sb, root);
if (unlikely(!sci))
return -ENOMEM;
err = nilfs_segctor_start_thread(nilfs->ns_writer);
if (unlikely(err))
nilfs->ns_writer = sci;
t = kthread_create(nilfs_segctor_thread, sci, "segctord");
if (IS_ERR(t)) {
err = PTR_ERR(t);
nilfs_err(sb, "error %d creating segctord thread", err);
nilfs_detach_log_writer(sb);
return err;
}
sci->sc_task = t;
timer_setup(&sci->sc_timer, nilfs_construction_timeout, 0);
wake_up_process(sci->sc_task);
return 0;
}
/**

3
fs/nilfs2/segment.h
View File

@ -105,7 +105,6 @@ struct nilfs_segsum_pointer {
* @sc_flush_request: inode bitmap of metadata files to be flushed
* @sc_wait_request: Client request queue
* @sc_wait_daemon: Daemon wait queue
* @sc_wait_task: Start/end wait queue to control segctord task
* @sc_seq_request: Request counter
* @sc_seq_accepted: Accepted request count
* @sc_seq_done: Completion counter
@ -158,7 +157,6 @@ struct nilfs_sc_info {
wait_queue_head_t sc_wait_request;
wait_queue_head_t sc_wait_daemon;
wait_queue_head_t sc_wait_task;
__u32 sc_seq_request;
__u32 sc_seq_accepted;
@ -191,7 +189,6 @@ enum {
};
/* sc_state */
#define NILFS_SEGCTOR_QUIT 0x0001 /* segctord is being destroyed */
#define NILFS_SEGCTOR_COMMIT 0x0004 /* committed transaction exists */
/*