From f925d0efa2161aef215f858347a9036f1153c4b2 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Mon, 24 Jun 2013 15:02:09 +0200
Subject: Add partitioning reload support to ahci

* linux/dev/drivers/block/ahci.c (port): Add `gd' field.
(ahci_ioctl): New function.
(ahci_fops): Fill `ioctl' field with `ahci_ioctl'.
(ahci_probe_pci): Fill `gd' field with `gd'.
---
 linux/dev/drivers/block/ahci.c | 35 +++++++++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

(limited to 'linux/dev/drivers/block/ahci.c')

diff --git a/linux/dev/drivers/block/ahci.c b/linux/dev/drivers/block/ahci.c
index ceded7c..2c573ac 100644
--- a/linux/dev/drivers/block/ahci.c
+++ b/linux/dev/drivers/block/ahci.c
@@ -248,6 +248,7 @@ static struct port {
 	unsigned lba48;			/* Whether LBA48 is supported */
 	unsigned identify;		/* Whether we are just identifying
 					   at boot */
+	struct gendisk *gd;
 } ports[MAX_PORTS];
 
 
@@ -471,6 +472,34 @@ static void ahci_interrupt (int irq, void *host, struct pt_regs *regs)
 	/* unlock */
 }
 
+static int ahci_ioctl (struct inode *inode, struct file *file,
+			unsigned int cmd, unsigned long arg)
+{
+	int major, unit;
+
+	if (!inode || !inode->i_rdev)
+		return -EINVAL;
+
+	major = MAJOR(inode->i_rdev);
+	if (major != MAJOR_NR)
+		return -ENOTTY;
+
+	unit = DEVICE_NR(inode->i_rdev);
+	if (unit >= MAX_PORTS)
+		return -EINVAL;
+
+	switch (cmd) {
+		case BLKRRPART:
+			if (!suser()) return -EACCES;
+			if (!ports[unit].gd)
+				return -EINVAL;
+			resetup_one_dev(ports[unit].gd, unit);
+			return 0;
+		default:
+			return -EPERM;
+	}
+}
+
 static int ahci_open (struct inode *inode, struct file *file)
 {
 	int target;
@@ -504,7 +533,7 @@ static struct file_operations ahci_fops = {
 	.write = block_write,
 	.readdir = NULL,
 	.select = NULL,
-	.ioctl = NULL,
+	.ioctl = ahci_ioctl,
 	.mmap = NULL,
 	.open = ahci_open,
 	.release = ahci_release,
@@ -875,8 +904,10 @@ void ahci_probe_pci(void)
 
 	memset(gd->part, 0, nminors * sizeof(*gd->part));
 
-	for (unit = 0; unit < nports; unit++)
+	for (unit = 0; unit < nports; unit++) {
+		ports[unit].gd = gd;
 		ports[unit].part = &gd->part[unit << PARTN_BITS];
+	}
 
 	gd->major       = MAJOR_NR;
 	gd->major_name  = "sd";
-- 
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