From a1acc1bc780caca5c18820701ac10903deb2c129 Mon Sep 17 00:00:00 2001
From: Vladislav Bolkhovitin <vst@vlnb.net>
Date: Tue, 17 Mar 2009 18:07:36 +0000
Subject: [PATCH]  - scst_user docs updated

 - Added notification about device change in fileio_tgt



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@700 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 doc/scst_user_spec.txt | 14 ++++++++++++++
 usr/fileio/common.c    |  6 +++++-
 usr/fileio/fileio.c    | 37 +++++++++++++++++++++++++++++++++++--
 3 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/doc/scst_user_spec.txt b/doc/scst_user_spec.txt
index 2a1d51967..a7e0e369f 100644
--- a/doc/scst_user_spec.txt
+++ b/doc/scst_user_spec.txt
@@ -829,6 +829,20 @@ SCST_USER_FLUSH_CACHE returns 0 on success or -1 in case of error,
 and errno is set appropriately.
 
 
+		7. SCST_USER_DEVICE_CAPACITY_CHANGED
+
+SCST_USER_DEVICE_CAPACITY_CHANGED - queues CAPACITY DATA HAS CHANGED
+Unit Attention or corresponding Asynchronous Event to the corresponding
+virtual device. It will notify remote initiators, connected to the
+device, and allow them to automatically refresh new device size. You
+should use SCST_USER_DEVICE_CAPACITY_CHANGED after resize of the device.
+
+SCST_USER_DEVICE_CAPACITY_CHANGED doesn't have any parameters.
+
+SCST_USER_DEVICE_CAPACITY_CHANGED returns 0 on success or -1 in case of
+error, and errno is set appropriately.
+
+
 		IV. Commands processing flow example.
 
 As the example consider a simple synchronous VTL, which serves one
diff --git a/usr/fileio/common.c b/usr/fileio/common.c
index 67619d719..3111fb6ae 100644
--- a/usr/fileio/common.c
+++ b/usr/fileio/common.c
@@ -125,14 +125,18 @@ static inline void set_cmd_error_status(struct scst_user_scsi_cmd_reply_exec *re
 
 static int set_sense(uint8_t *buffer, int len, int key, int asc, int ascq)
 {
-	int res = 14;
+	int res = SCST_STANDARD_SENSE_LEN;
+
 	EXTRACHECKS_BUG_ON(len < res);
+
 	memset(buffer, 0, res);
+
 	buffer[0] = 0x70;	/* Error Code			*/
 	buffer[2] = key;	/* Sense Key			*/
 	buffer[7] = 0x0a;	/* Additional Sense Length	*/
 	buffer[12] = asc;	/* ASC				*/
 	buffer[13] = ascq;	/* ASCQ				*/
+
 	TRACE_BUFFER("Sense set", buffer, res);
 	return res;
 }
diff --git a/usr/fileio/fileio.c b/usr/fileio/fileio.c
index b04cbf85f..a902d6c01 100644
--- a/usr/fileio/fileio.c
+++ b/usr/fileio/fileio.c
@@ -189,6 +189,28 @@ out:
 	return;
 }
 
+void sigusr1_handler(int signo)
+{
+	int res;
+
+	TRACE_ENTRY();
+
+	TRACE_MGMT_DBG("%s", "Capacity data changed...");
+
+	res = ioctl(dev.scst_usr_fd, SCST_USER_DEVICE_CAPACITY_CHANGED, NULL);
+	if (res != 0) {
+		res = errno;
+		PRINT_ERROR("Capacity data changed failed: %s", strerror(res));
+		goto out;
+	}
+
+	TRACE_DBG("%s", "Capacity data changed done.");
+
+out:
+	TRACE_EXIT();
+	return;
+}
+
 int main(int argc, char **argv)
 {
 	int res = 0;
@@ -480,6 +502,19 @@ int main(int argc, char **argv)
 		pthread_t thread[threads];
 		int i, j, rc;
 		void *rc1;
+		struct sigaction act;
+
+		memset(&act, 0, sizeof(act));
+		act.sa_handler = sigusr1_handler;
+		act.sa_flags = SA_RESTART;
+		sigemptyset(&act.sa_mask);
+		res = sigaction(SIGUSR1, &act, NULL);
+		if (res != 0) {
+			res = errno;
+			PRINT_ERROR("sigaction() failed: %s",
+				strerror(res));
+			/* don't do anything */
+		}       
 
 		for(i = 0; i < threads; i++) {
 			rc = pthread_create(&thread[i], NULL, main_loop, &dev);
@@ -492,8 +527,6 @@ int main(int argc, char **argv)
 		}
 
 		if (flush_interval != 0) {
-			struct sigaction act;
-
 			memset(&act, 0, sizeof(act));
 			act.sa_handler = sigalrm_handler;
 			act.sa_flags = SA_RESTART;