From 3ef7859b7d25ed88f0f1914b54af1cbca681769e Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 20 Feb 2007 11:01:57 -0500
Subject: [PATCH] --- yaml --- r: 53699 b: refs/heads/master c:
 44ec95425c1d9dce6e4638c29e4362cfb44814e7 h: refs/heads/master i:   53697:
 79b7b7cba00b31773f0eb60f5938331915a28639   53695:
 1bb4f0811725eedf0d9dba22507a48bdd691b5b4 v: v3

---
 [refs]                   |  2 +-
 trunk/block/ll_rw_blk.c  |  2 ++
 trunk/block/scsi_ioctl.c |  4 +++-
 trunk/drivers/scsi/sg.c  | 13 +++++++++++--
 4 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/[refs] b/[refs]
index d2351f597605..6201fe8c7a38 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1079a2d251f24a7d9e7576217f5f738bc4218337
+refs/heads/master: 44ec95425c1d9dce6e4638c29e4362cfb44814e7
diff --git a/trunk/block/ll_rw_blk.c b/trunk/block/ll_rw_blk.c
index 38c293b987b7..cf8752abd61a 100644
--- a/trunk/block/ll_rw_blk.c
+++ b/trunk/block/ll_rw_blk.c
@@ -1925,6 +1925,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
 	blk_queue_max_hw_segments(q, MAX_HW_SEGMENTS);
 	blk_queue_max_phys_segments(q, MAX_PHYS_SEGMENTS);
 
+	q->sg_reserved_size = INT_MAX;
+
 	/*
 	 * all done
 	 */
diff --git a/trunk/block/scsi_ioctl.c b/trunk/block/scsi_ioctl.c
index 65c6a3cba6d6..e83f1dbf7c29 100644
--- a/trunk/block/scsi_ioctl.c
+++ b/trunk/block/scsi_ioctl.c
@@ -78,7 +78,9 @@ static int sg_set_timeout(request_queue_t *q, int __user *p)
 
 static int sg_get_reserved_size(request_queue_t *q, int __user *p)
 {
-	return put_user(q->sg_reserved_size, p);
+	unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
+
+	return put_user(val, p);
 }
 
 static int sg_set_reserved_size(request_queue_t *q, int __user *p)
diff --git a/trunk/drivers/scsi/sg.c b/trunk/drivers/scsi/sg.c
index 81e3bc7b02a1..570977cf9efb 100644
--- a/trunk/drivers/scsi/sg.c
+++ b/trunk/drivers/scsi/sg.c
@@ -917,6 +917,8 @@ sg_ioctl(struct inode *inode, struct file *filp,
 			return result;
                 if (val < 0)
                         return -EINVAL;
+		val = min_t(int, val,
+				sdp->device->request_queue->max_sectors * 512);
 		if (val != sfp->reserve.bufflen) {
 			if (sg_res_in_use(sfp) || sfp->mmap_called)
 				return -EBUSY;
@@ -925,7 +927,8 @@ sg_ioctl(struct inode *inode, struct file *filp,
 		}
 		return 0;
 	case SG_GET_RESERVED_SIZE:
-		val = (int) sfp->reserve.bufflen;
+		val = min_t(int, sfp->reserve.bufflen,
+				sdp->device->request_queue->max_sectors * 512);
 		return put_user(val, ip);
 	case SG_SET_COMMAND_Q:
 		result = get_user(val, ip);
@@ -1061,6 +1064,9 @@ sg_ioctl(struct inode *inode, struct file *filp,
 		if (sdp->detached)
 			return -ENODEV;
 		return scsi_ioctl(sdp->device, cmd_in, p);
+	case BLKSECTGET:
+		return put_user(sdp->device->request_queue->max_sectors * 512,
+				ip);
 	default:
 		if (read_only)
 			return -EPERM;	/* don't know so take safe approach */
@@ -2339,6 +2345,7 @@ sg_add_sfp(Sg_device * sdp, int dev)
 {
 	Sg_fd *sfp;
 	unsigned long iflags;
+	int bufflen;
 
 	sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
 	if (!sfp)
@@ -2369,7 +2376,9 @@ sg_add_sfp(Sg_device * sdp, int dev)
 	if (unlikely(sg_big_buff != def_reserved_size))
 		sg_big_buff = def_reserved_size;
 
-	sg_build_reserve(sfp, sg_big_buff);
+	bufflen = min_t(int, sg_big_buff,
+			sdp->device->request_queue->max_sectors * 512);
+	sg_build_reserve(sfp, bufflen);
 	SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp:   bufflen=%d, k_use_sg=%d\n",
 			   sfp->reserve.bufflen, sfp->reserve.k_use_sg));
 	return sfp;