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cifs: Add a laundromat thread for cached directories

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and drop cached directories after 30 seconds

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2023-07-06 12:32:24 +10:00 committed by Steve French
parent dfbf0ee092
commit d14de8067e
2 changed files with 68 additions and 0 deletions
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67
fs/smb/client/cached_dir.c
View file

@ -568,6 +568,53 @@ static void free_cached_dir(struct cached_fid *cfid)
kfree(cfid);
}
static int
cifs_cfids_laundromat_thread(void *p)
{
struct cached_fids *cfids = p;
struct cached_fid *cfid, *q;
struct list_head entry;
while (!kthread_should_stop()) {
ssleep(1);
INIT_LIST_HEAD(&entry);
if (kthread_should_stop())
return 0;
spin_lock(&cfids->cfid_list_lock);
list_for_each_entry_safe(cfid, q, &cfids->entries, entry) {
if (time_after(jiffies, cfid->time + HZ * 30)) {
list_del(&cfid->entry);
list_add(&cfid->entry, &entry);
cfids->num_entries--;
}
}
spin_unlock(&cfids->cfid_list_lock);
list_for_each_entry_safe(cfid, q, &entry, entry) {
cfid->on_list = false;
list_del(&cfid->entry);
/*
* Cancel, and wait for the work to finish in
* case we are racing with it.
*/
cancel_work_sync(&cfid->lease_break);
if (cfid->has_lease) {
/*
* We lease has not yet been cancelled from
* the server so we need to drop the reference.
*/
spin_lock(&cfids->cfid_list_lock);
cfid->has_lease = false;
spin_unlock(&cfids->cfid_list_lock);
kref_put(&cfid->refcount, smb2_close_cached_fid);
}
}
}
return 0;
}
struct cached_fids *init_cached_dirs(void)
{
struct cached_fids *cfids;
@ -577,6 +624,20 @@ struct cached_fids *init_cached_dirs(void)
return NULL;
spin_lock_init(&cfids->cfid_list_lock);
INIT_LIST_HEAD(&cfids->entries);
/*
* since we're in a cifs function already, we know that
* this will succeed. No need for try_module_get().
*/
__module_get(THIS_MODULE);
cfids->laundromat = kthread_run(cifs_cfids_laundromat_thread,
cfids, "cifsd-cfid-laundromat");
if (IS_ERR(cfids->laundromat)) {
cifs_dbg(VFS, "Failed to start cfids laundromat thread.\n");
kfree(cfids);
module_put(THIS_MODULE);
return NULL;
}
return cfids;
}
@ -589,6 +650,12 @@ void free_cached_dirs(struct cached_fids *cfids)
struct cached_fid *cfid, *q;
LIST_HEAD(entry);
if (cfids->laundromat) {
kthread_stop(cfids->laundromat);
cfids->laundromat = NULL;
module_put(THIS_MODULE);
}
spin_lock(&cfids->cfid_list_lock);
list_for_each_entry_safe(cfid, q, &cfids->entries, entry) {
cfid->on_list = false;

1
fs/smb/client/cached_dir.h
View file

@ -57,6 +57,7 @@ struct cached_fids {
spinlock_t cfid_list_lock;
int num_entries;
struct list_head entries;
struct task_struct *laundromat;
};
extern struct cached_fids *init_cached_dirs(void);