[XFS] Switch kernel thread handling to the kthread_ API

SGI-PV: 942063
SGI-Modid: xfs-linux:xfs-kern:198388a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 9 insertions, 27 deletions

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 910e43bfc95b..0da87bfc9999 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -72,6 +72,7 @@
 #include <linux/mount.h>
 #include <linux/mempool.h>
 #include <linux/writeback.h>
+#include <linux/kthread.h>
 
 STATIC struct quotactl_ops linvfs_qops;
 STATIC struct super_operations linvfs_sops;
@@ -516,25 +517,16 @@ xfssyncd(
 {
         long                    timeleft;
         vfs_t                   *vfsp = (vfs_t *) arg;
-        struct list_head        tmp;
         struct vfs_sync_work    *work, *n;
+        LIST_HEAD               (tmp);
 
-        daemonize("xfssyncd");
-
-        vfsp->vfs_sync_work.w_vfs = vfsp;
-        vfsp->vfs_sync_work.w_syncer = vfs_sync_worker;
-        vfsp->vfs_sync_task = current;
-        wmb();
-        wake_up(&vfsp->vfs_wait_sync_task);
-
-        INIT_LIST_HEAD(&tmp);
         timeleft = (xfs_syncd_centisecs * HZ) / 100;
         for (;;) {
                 set_current_state(TASK_INTERRUPTIBLE);
                 timeleft = schedule_timeout(timeleft);
                 /* swsusp */
                 try_to_freeze();
-                if (vfsp->vfs_flag & VFS_UMOUNT)
+                if (kthread_should_stop())
                         break;
 
                 spin_lock(&vfsp->vfs_sync_lock);
@@ -563,10 +555,6 @@ xfssyncd(
                 }
         }
 
-        vfsp->vfs_sync_task = NULL;
-        wmb();
-        wake_up(&vfsp->vfs_wait_sync_task);
-
         return 0;
 }
 
@@ -574,13 +562,11 @@ STATIC int
 linvfs_start_syncd(
         vfs_t                   *vfsp)
 {
-        int                     pid;
-
-        pid = kernel_thread(xfssyncd, (void *) vfsp,
-                        CLONE_VM | CLONE_FS | CLONE_FILES);
-        if (pid < 0)
-                return -pid;
-        wait_event(vfsp->vfs_wait_sync_task, vfsp->vfs_sync_task);
+        vfsp->vfs_sync_work.w_syncer = vfs_sync_worker;
+        vfsp->vfs_sync_work.w_vfs = vfsp;
+        vfsp->vfs_sync_task = kthread_run(xfssyncd, vfsp, "xfssyncd");
+        if (IS_ERR(vfsp->vfs_sync_task))
+                return -PTR_ERR(vfsp->vfs_sync_task);
         return 0;
 }
 
@@ -588,11 +574,7 @@ STATIC void
 linvfs_stop_syncd(
         vfs_t                   *vfsp)
 {
-        vfsp->vfs_flag |= VFS_UMOUNT;
-        wmb();
-
-        wake_up_process(vfsp->vfs_sync_task);
-        wait_event(vfsp->vfs_wait_sync_task, !vfsp->vfs_sync_task);
+        kthread_stop(vfsp->vfs_sync_task);
 }
 
 STATIC void