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authorRonnie Sahlberg <lsahlber@redhat.com>2023-07-06 05:32:24 +0300
committerSteve French <stfrench@microsoft.com>2023-07-06 06:36:07 +0300
commitd14de8067e3f9653cdef5a094176d00f3260ab20 (patch)
tree7a33e7c5f21232dbe162ab834ca1f7796870c5a4 /fs
parentdfbf0ee092a5d7a9301c81e815b5e50b7c0aeeda (diff)
downloadlinux-d14de8067e3f9653cdef5a094176d00f3260ab20.tar.xz
cifs: Add a laundromat thread for cached directories
and drop cached directories after 30 seconds Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/smb/client/cached_dir.c67
-rw-r--r--fs/smb/client/cached_dir.h1
2 files changed, 68 insertions, 0 deletions
diff --git a/fs/smb/client/cached_dir.c b/fs/smb/client/cached_dir.c
index bfc964b36c72..fe483f163dbc 100644
--- a/fs/smb/client/cached_dir.c
+++ b/fs/smb/client/cached_dir.c
@@ -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;
diff --git a/fs/smb/client/cached_dir.h b/fs/smb/client/cached_dir.h
index 2f4e764c9ca9..facc9b154d00 100644
--- a/fs/smb/client/cached_dir.h
+++ b/fs/smb/client/cached_dir.h
@@ -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);