From 25921536da17d72dccc9aed736ce5f26ba08b4cb Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Mon, 8 Dec 2008 16:59:18 -0700
Subject: [PATCH] imsm: sysfs support routines for determining device
 connectivity

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 platform-intel.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
 platform-intel.h |  3 +++
 2 files changed, 64 insertions(+)

diff --git a/platform-intel.c b/platform-intel.c
index 6cd5830..03e4ba7 100644
--- a/platform-intel.c
+++ b/platform-intel.c
@@ -176,3 +176,64 @@ const struct imsm_orom *find_imsm_orom(void)
 		return &imsm_orom;
 	return NULL;
 }
+
+char *devt_to_devpath(dev_t dev)
+{
+	char device[40];
+
+	sprintf(device, "/sys/dev/block/%d:%d/device", major(dev), minor(dev));
+	return canonicalize_file_name(device);
+}
+
+static char *diskfd_to_devpath(int fd)
+{
+	/* return the device path for a disk, return NULL on error or fd
+	 * refers to a partition
+	 */
+	struct stat st;
+
+	if (fstat(fd, &st) != 0)
+		return NULL;
+	if (!S_ISBLK(st.st_mode))
+		return NULL;
+
+	return devt_to_devpath(st.st_rdev);
+}
+
+int path_attached_to_hba(const char *disk_path, const char *hba_path)
+{
+	int rc;
+
+	if (!disk_path || !hba_path)
+		return 0;
+
+	if (strncmp(disk_path, hba_path, strlen(hba_path)) == 0)
+		rc = 1;
+	else
+		rc = 0;
+
+	return rc;
+}
+
+int devt_attached_to_hba(dev_t dev, const char *hba_path)
+{
+	char *disk_path = devt_to_devpath(dev);
+	int rc = path_attached_to_hba(disk_path, hba_path);
+
+	if (disk_path)
+		free(disk_path);
+
+	return rc;
+}
+
+int disk_attached_to_hba(int fd, const char *hba_path)
+{
+	char *disk_path = diskfd_to_devpath(fd);
+	int rc = path_attached_to_hba(disk_path, hba_path);
+
+	if (disk_path)
+		free(disk_path);
+
+	return rc;
+}
+
diff --git a/platform-intel.h b/platform-intel.h
index 9252002..c126482 100644
--- a/platform-intel.h
+++ b/platform-intel.h
@@ -87,3 +87,6 @@ struct sys_dev *find_driver_devices(const char *bus, const char *driver);
 __u16 devpath_to_vendor(const char *dev_path);
 void free_sys_dev(struct sys_dev **list);
 const struct imsm_orom *find_imsm_orom(void);
+int disk_attached_to_hba(int fd, const char *hba_path);
+char *devt_to_devpath(dev_t dev);
+int path_attached_to_hba(const char *disk_path, const char *hba_path);