[PATCH] fs: fix-up schedule_timeout() usage

Use schedule_timeout_{,un}interruptible() instead of
set_current_state()/schedule_timeout() to reduce kernel size.  Also use helper
functions to convert between human time units and jiffies rather than constant
HZ division to avoid rounding errors.
Signed-off-by: NNishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/cifs/connect.c

@@ -3215,10 +3215,8 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
 	}
 	
 	cifs_sb->tcon = NULL;
-	if (ses) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		schedule_timeout(HZ / 2);
-	}
+	if (ses)
+		schedule_timeout_interruptible(msecs_to_jiffies(500));
 	if (ses)
 		sesInfoFree(ses);
 

fs/jbd/transaction.c

@@ -1340,8 +1340,7 @@ int journal_stop(handle_t *handle)
 	if (handle->h_sync) {
 		do {
 			old_handle_count = transaction->t_handle_count;
-			set_current_state(TASK_UNINTERRUPTIBLE);
-			schedule_timeout(1);
+			schedule_timeout_uninterruptible(1);
 		} while (old_handle_count != transaction->t_handle_count);
 	}
 

fs/lockd/clntproc.c

@@ -299,8 +299,7 @@ nlmclnt_alloc_call(void)
 			return call;
 		}
 		printk("nlmclnt_alloc_call: failed, waiting for memory\n");
-		current->state = TASK_INTERRUPTIBLE;
-		schedule_timeout(5*HZ);
+		schedule_timeout_interruptible(5*HZ);
 	}
 	return NULL;
 }

fs/nfs/nfs3proc.c

@@ -34,8 +34,7 @@ nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
 		res = rpc_call_sync(clnt, msg, flags);
 		if (res != -EJUKEBOX)
 			break;
-		set_current_state(TASK_INTERRUPTIBLE);
-		schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
+		schedule_timeout_interruptible(NFS_JUKEBOX_RETRY_TIME);
 		res = -ERESTARTSYS;
 	} while (!signalled());
 	rpc_clnt_sigunmask(clnt, &oldset);

fs/nfs/nfs4proc.c

@@ -2418,14 +2418,11 @@ static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 		*timeout = NFS4_POLL_RETRY_MAX;
 	rpc_clnt_sigmask(clnt, &oldset);
 	if (clnt->cl_intr) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		schedule_timeout(*timeout);
+		schedule_timeout_interruptible(*timeout);
 		if (signalled())
 			res = -ERESTARTSYS;
-	} else {
-		set_current_state(TASK_UNINTERRUPTIBLE);
-		schedule_timeout(*timeout);
-	}
+	} else
+		schedule_timeout_uninterruptible(*timeout);
 	rpc_clnt_sigunmask(clnt, &oldset);
 	*timeout <<= 1;
 	return res;
@@ -2578,8 +2575,7 @@ int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4
 static unsigned long
 nfs4_set_lock_task_retry(unsigned long timeout)
 {
-	current->state = TASK_INTERRUPTIBLE;
-	schedule_timeout(timeout);
+	schedule_timeout_interruptible(timeout);
 	timeout <<= 1;
 	if (timeout > NFS4_LOCK_MAXTIMEOUT)
 		return NFS4_LOCK_MAXTIMEOUT;

fs/reiserfs/journal.c

@@ -2868,8 +2868,7 @@ static void let_transaction_grow(struct super_block *sb, unsigned long trans_id)
 	struct reiserfs_journal *journal = SB_JOURNAL(sb);
 	unsigned long bcount = journal->j_bcount;
 	while (1) {
-		set_current_state(TASK_UNINTERRUPTIBLE);
-		schedule_timeout(1);
+		schedule_timeout_uninterruptible(1);
 		journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
 		while ((atomic_read(&journal->j_wcount) > 0 ||
 			atomic_read(&journal->j_jlock)) &&

fs/smbfs/proc.c

@@ -2397,8 +2397,7 @@ smb_proc_readdir_long(struct file *filp, void *dirent, filldir_t filldir,
 		if (req->rq_rcls == ERRSRV && req->rq_err == ERRerror) {
 			/* a damn Win95 bug - sometimes it clags if you 
 			   ask it too fast */
-			current->state = TASK_INTERRUPTIBLE;
-			schedule_timeout(HZ/5);
+			schedule_timeout_interruptible(msecs_to_jiffies(200));
 			continue;
                 }
 

fs/xfs/linux-2.6/time.h

@@ -39,8 +39,7 @@ typedef struct timespec timespec_t;
 
 static inline void delay(long ticks)
 {
-	set_current_state(TASK_UNINTERRUPTIBLE);
-	schedule_timeout(ticks);
+	schedule_timeout_uninterruptible(ticks);
 }
 
 static inline void nanotime(struct timespec *tvp)

fs/xfs/linux-2.6/xfs_buf.c

@@ -1780,10 +1780,10 @@ xfsbufd(
 			xfsbufd_force_sleep = 0;
 		}
 
-		set_current_state(TASK_INTERRUPTIBLE);
-		schedule_timeout((xfs_buf_timer_centisecs * HZ) / 100);
+		schedule_timeout_interruptible
+			(xfs_buf_timer_centisecs * msecs_to_jiffies(10));
 
-		age = (xfs_buf_age_centisecs * HZ) / 100;
+		age = xfs_buf_age_centisecs * msecs_to_jiffies(10);
 		spin_lock(&pbd_delwrite_lock);
 		list_for_each_entry_safe(pb, n, &pbd_delwrite_queue, pb_list) {
 			PB_TRACE(pb, "walkq1", (long)pagebuf_ispin(pb));

fs/xfs/linux-2.6/xfs_super.c

@@ -467,7 +467,7 @@ xfs_flush_inode(
 
 	igrab(inode);
 	xfs_syncd_queue_work(vfs, inode, xfs_flush_inode_work);
-	delay(HZ/2);
+	delay(msecs_to_jiffies(500));
 }
 
 /*
@@ -492,7 +492,7 @@ xfs_flush_device(
 
 	igrab(inode);
 	xfs_syncd_queue_work(vfs, inode, xfs_flush_device_work);
-	delay(HZ/2);
+	delay(msecs_to_jiffies(500));
 	xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
 }
 
@@ -520,10 +520,9 @@ xfssyncd(
 	struct vfs_sync_work	*work, *n;
 	LIST_HEAD		(tmp);
 
-	timeleft = (xfs_syncd_centisecs * HZ) / 100;
+	timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10);
 	for (;;) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		timeleft = schedule_timeout(timeleft);
+		timeleft = schedule_timeout_interruptible(timeleft);
 		/* swsusp */
 		try_to_freeze();
 		if (kthread_should_stop())
@@ -537,7 +536,8 @@ xfssyncd(
 		 */
 		if (!timeleft || list_empty(&vfsp->vfs_sync_list)) {
 			if (!timeleft)
-				timeleft = (xfs_syncd_centisecs * HZ) / 100;
+				timeleft = xfs_syncd_centisecs *
+							msecs_to_jiffies(10);
 			INIT_LIST_HEAD(&vfsp->vfs_sync_work.w_list);
 			list_add_tail(&vfsp->vfs_sync_work.w_list,
 					&vfsp->vfs_sync_list);