Add NetBSD support for libxl

# HG changeset patch
# User Roger Pau Monne <[email protected]> # Date 1316692475 -7200
# Node ID 576c0ce336acb501cbba245dc801f06edc391479 # Parent a422e2a4451e16dc791b293f41966b842fa4781d
xenbackendd: fix incorrect usage of pidfile

Fix xenbackendd ignoring the pidfile passed through the command line.

Signed-off-by Roger Pau Monne <[email protected]>

diff -r a422e2a4451e -r 576c0ce336ac tools/xenbackendd/xenbackendd.c

tools/xenbackendd/xenbackendd.c +1 -1

@@ -169,7 +169,7 @@ main(int argc, char * const argv[])
 			log_file = optarg;
 			break;
 		case 'p':
-			pidfile = pidfile;
+			pidfile = optarg;
 		case 's':
 			vbd_script = optarg;
 			break;

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# HG changeset patch
# User Roger Pau Monne <[email protected]> # Date 1316692482 -7200
# Node ID 1d3830f8a7306088b49d5732b5e88a73c2bc0315 # Parent 576c0ce336acb501cbba245dc801f06edc391479
hotplug: set hotplug-status to disconnected at removal

Set the hotplug-status attribute of xenstore to disconnected when the hotplug block script has finished disconnecting the device

Signed-off-by Roger Pau Monne <[email protected]>

# HG changeset patch
# User Roger Pau Monne <[email protected]> # Date 1316692495 -7200
# Node ID d5cca9e3b5d3576073a543d0305e8f0d9dc9beeb # Parent 2d77cbdc816bc943e9e69ecca34ae7157079045a
libxl: fix for libxl not waiting for devices to disconnect

libxl was ignoring the timeout and the number of devices to wait before destroying them.

Signed-off-by Roger Pau Monne <[email protected]>

diff -r 2d77cbdc816b -r d5cca9e3b5d3 tools/libxl/libxl_device.c

tools/libxl/libxl_device.c +4 -1

@@ -422,6 +422,9 @@ static int wait_for_dev_destroy(libxl__g
             }
             free(l1);
         }
+    } else {
+        /* timeout reached */
+        rc = 0;
     }
     return rc;
 }

@@ -482,7 +485,7 @@ int libxl__devices_destroy(libxl__gc *gc
         tv.tv_usec = 0;
         while (n_watches > 0) {
             if (wait_for_dev_destroy(gc, &tv)) {
-                break;
+                continue;
             } else {
                 n_watches--;
             }

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# HG changeset patch
# User Roger Pau Monne <[email protected]> # Date 1316692489 -7200
# Node ID 2d77cbdc816bc943e9e69ecca34ae7157079045a # Parent 1d3830f8a7306088b49d5732b5e88a73c2bc0315
xenbackendd: pass type of block device to hotplug script

Pass the type of block device to attach to the block script instead of reading it from xenstore, since new Xen versions don't make a difference between a block device or an image.

Signed-off-by Roger Pau Monne <[email protected]>

diff -r 1d3830f8a730 -r 2d77cbdc816b tools/hotplug/NetBSD/block

tools/hotplug/NetBSD/block +1 -1

@@ -19,7 +19,7 @@ error() {
 
 xpath=$1
 xstatus=$2
-xtype=$(xenstore-read "$xpath/type")
+xtype=$3
 xparams=$(xenstore-read "$xpath/params")
 
 case $xstatus in

diff -r 1d3830f8a730 -r 2d77cbdc816b tools/xenbackendd/xenbackendd.c

tools/xenbackendd/xenbackendd.c +35 -5

@@ -89,15 +89,15 @@ dodebug(const char *fmt, ...)
 }
 
 static void
-doexec(const char *cmd, const char *arg1, const char *arg2)
+doexec(const char *cmd, const char *arg1, const char *arg2, const char *arg3)
 {
-	dodebug("exec %s %s %s", cmd, arg1, arg2);
+	dodebug("exec %s %s %s %s", cmd, arg1, arg2, arg3);
 	switch(vfork()) {
 	case -1:
 		dolog(LOG_ERR, "can't vfork: %s", strerror(errno));
 		break;
 	case 0:
-		execl(cmd, cmd, arg1, arg2, NULL);
+		execl(cmd, cmd, arg1, arg2, arg3, NULL);
 		dolog(LOG_ERR, "can't exec %s: %s", cmd, strerror(errno));
 		exit(EXIT_FAILURE);
 		/* NOTREACHED */

@@ -145,11 +145,14 @@ xen_setup(void)
 int
 main(int argc, char * const argv[])
 {
+	struct stat stab;
 	char **vec;
 	unsigned int num;
 	char *s;
 	int state;
 	char *sstate;
+	char *stype;
+	char *params;
 	char *p;
 	char buf[80];
 	int type;

@@ -297,11 +300,38 @@ main(int argc, char * const argv[])
 				    strerror(errno));
 				goto next2;
 			}
-			doexec(s, vec[XS_WATCH_PATH], sstate);
+			doexec(s, vec[XS_WATCH_PATH], sstate, NULL);
 			break;
 
 		case DEVTYPE_VBD:
-			doexec(vbd_script, vec[XS_WATCH_PATH], sstate);
+			/* check if given file is a block device or a raw image */
+			snprintf(buf, sizeof(buf), "%s/params", vec[XS_WATCH_PATH]);
+			params = xs_read(xs, XBT_NULL, buf, 0);
+			if(params == NULL) {
+				dolog(LOG_ERR,
+					"Failed to read %s (%s)", buf, strerror(errno));
+				goto next2;
+			}
+			if (stat(params, &stab) < 0) {
+				dolog(LOG_ERR,
+					"Failed to get info about %s (%s)", params,
+					strerror(errno));
+				goto next3;
+			}
+			stype = NULL;
+			if (S_ISBLK(stab.st_mode))
+				stype = "phy";
+			if (S_ISREG(stab.st_mode))
+				stype = "file";
+			if (stype == NULL) {
+				dolog(LOG_ERR,
+					"Failed to attach %s (not a block device or raw image)",
+					params, strerror(errno));
+				goto next3;
+			}
+			doexec(vbd_script, vec[XS_WATCH_PATH], sstate, stype);
+next3:
+			free(params);
 			break;
 
 		default:

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# HG changeset patch
# User Roger Pau Monne <[email protected]>
# Date 1316692503 -7200
# Node ID a5c9a6083bef9d4789a0194389db234740cd6005
# Parent d5cca9e3b5d3576073a543d0305e8f0d9dc9beeb
libxl: add support for NetBSD to use disk images as a PHY backend

Add a NetBSD special case to use images as PHY disk devices, which can be attached using the regular block hotplug script.

Signed-off-by Roger Pau Monne <[email protected]>

diff -r d5cca9e3b5d3 -r a5c9a6083bef tools/libxl/libxl_device.c

tools/libxl/libxl_device.c +14 -9

@@ -136,15 +136,20 @@ static int disk_try_backend(disk_try_bac
               a->disk->format == LIBXL_DISK_FORMAT_EMPTY)) {
             goto bad_format;
         }
-        if (a->disk->format != LIBXL_DISK_FORMAT_EMPTY &&
-            !S_ISBLK(a->stab.st_mode)) {
-            LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Disk vdev=%s, backend phy"
-                       " unsuitable as phys path not a block device",
-                       a->disk->vdev);
-            return 0;
-        }
-
-        return backend;
+        if (S_ISBLK(a->stab.st_mode))
+            return backend;
+#ifdef HAVE_PHY_BACKEND_FILE_SUPPORT
+        if (S_ISREG(a->stab.st_mode))
+            return backend;
+        LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Disk vdev=%s, backend phy"
+            " unsuitable as phys path not a block device or"
+            " raw image", a->disk->vdev);
+#else
+        LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Disk vdev=%s, backend phy"
+            " unsuitable as phys path not a block device",
+            a->disk->vdev);
+#endif
+        return 0;
 
     case LIBXL_DISK_BACKEND_TAP:
         if (!libxl__blktap_enabled(a->gc)) {

diff -r d5cca9e3b5d3 -r a5c9a6083bef tools/libxl/libxl_osdeps.h

tools/libxl/libxl_osdeps.h +1 -0

@@ -25,6 +25,7 @@
 
 #if defined(__NetBSD__) || defined(__OpenBSD__)
 #include <util.h>
+#define HAVE_PHY_BACKEND_FILE_SUPPORT
 #elif defined(__linux__)
 #include <pty.h>
 #elif defined(__sun__)

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# HG changeset patch
# User Roger Pau Monne <[email protected]>
# Date 1316692512 -7200
# Node ID 9e9c68768676b0e1c9c76599e00d0922c6184602
# Parent a5c9a6083bef9d4789a0194389db234740cd6005
libxl: use hotplug-status to synchronize the destruction of block devices

Use hotplug-status to synchronize the destruction of vbd devices instead of state, which did not reflect when the hotplug script had been executed.

Signed-off-by Roger Pau Monne <[email protected]>

diff -r a5c9a6083bef -r 9e9c68768676 tools/libxl/libxl_device.c

tools/libxl/libxl_device.c +43 -11

@@ -371,14 +371,26 @@ int libxl__device_destroy(libxl__gc *gc,
     libxl_ctx *ctx = libxl__gc_owner(gc);
     xs_transaction_t t;
     char *state_path = libxl__sprintf(gc, "%s/state", be_path);
+    char *hotplug_path = libxl__sprintf(gc, "%s/hotplug-status", be_path);
     char *state = libxl__xs_read(gc, XBT_NULL, state_path);
+    char *hotplug = libxl__xs_read(gc, XBT_NULL, hotplug_path);
     int rc = 0;
 
     if (!state)
         goto out;
-    if (atoi(state) != 4) {
-        xs_rm(ctx->xsh, XBT_NULL, be_path);
-        goto out;
+
+    if (!strstr(be_path, string_of_kinds[DEVICE_VBD])) {
+        if (atoi(state) != 4) {
+            xs_rm(ctx->xsh, XBT_NULL, be_path);
+            goto out;
+        }
+    } else {
+        if (!hotplug)
+            goto out;
+        if (!strcmp(hotplug, "disconnected")) {
+            xs_rm(ctx->xsh, XBT_NULL, be_path);
+            goto out;
+        }
     }
 
 retry_transaction:

@@ -394,8 +406,13 @@ retry_transaction:
         }
     }
     if (!force) {
-        xs_watch(ctx->xsh, state_path, be_path);
-        rc = 1;
+        if (strstr(be_path, string_of_kinds[DEVICE_VBD])) {
+            xs_watch(ctx->xsh, hotplug_path, be_path);
+            rc = 1;
+        } else {
+            xs_watch(ctx->xsh, state_path, be_path);
+            rc = 1;
+        }
     } else {
         xs_rm(ctx->xsh, XBT_NULL, be_path);
     }

@@ -410,6 +427,7 @@ static int wait_for_dev_destroy(libxl__g
     unsigned int n;
     fd_set rfds;
     char **l1 = NULL;
+    char *state, *hotplug;
 
     rc = 1;
     nfds = xs_fileno(ctx->xsh) + 1;

@@ -418,12 +436,26 @@ static int wait_for_dev_destroy(libxl__g
     if (select(nfds, &rfds, NULL, NULL, tv) > 0) {
         l1 = xs_read_watch(ctx->xsh, &n);
         if (l1 != NULL) {
-            char *state = libxl__xs_read(gc, XBT_NULL, l1[XS_WATCH_PATH]);
-            if (!state || atoi(state) == 6) {
-                xs_unwatch(ctx->xsh, l1[0], l1[1]);
-                xs_rm(ctx->xsh, XBT_NULL, l1[XS_WATCH_TOKEN]);
-                LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Destroyed device backend at %s", l1[XS_WATCH_TOKEN]);
-                rc = 0;
+            if (strstr(l1[XS_WATCH_PATH], "hotplug-status")) {
+                hotplug = libxl__xs_read(gc, XBT_NULL, l1[XS_WATCH_PATH]);
+                if (!hotplug || !strcmp(hotplug, "disconnected")) {
+                    xs_unwatch(ctx->xsh, l1[0], l1[1]);
+                    xs_rm(ctx->xsh, XBT_NULL, l1[XS_WATCH_TOKEN]);
+                    LIBXL__LOG(ctx, LIBXL__LOG_DEBUG,
+                        "Destroyed device backend at %s hotplug-status: %s",
+                        l1[XS_WATCH_TOKEN], hotplug);
+                    rc = 0;
+                }
+            } else {
+                state = libxl__xs_read(gc, XBT_NULL, l1[XS_WATCH_PATH]);
+                if (!state || atoi(state) == 6) {
+                    xs_unwatch(ctx->xsh, l1[0], l1[1]);
+                    xs_rm(ctx->xsh, XBT_NULL, l1[XS_WATCH_TOKEN]);
+                    LIBXL__LOG(ctx, LIBXL__LOG_DEBUG,
+                        "Destroyed device backend at %s",
+                        l1[XS_WATCH_TOKEN]);
+                    rc = 0;
+                }
             }
             free(l1);
         }

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Quoted 7 lines · Roger Pau Monne

# HG changeset patch
# User Roger Pau Monne<[email protected]> # Date 1316692475 -7200
# Node ID 576c0ce336acb501cbba245dc801f06edc391479 # Parent a422e2a4451e16dc791b293f41966b842fa4781d
xenbackendd: fix incorrect usage of pidfile

Quoted 3 lines

Fix xenbackendd ignoring the pidfile passed through the command line.

Signed-off-by Roger Pau Monne<[email protected]>

Acked-by Ian Campbell<[email protected]>

Quoted 15 lines

diff -r a422e2a4451e -r 576c0ce336ac tools/xenbackendd/xenbackendd.c

tools/xenbackendd/xenbackendd.c +1 -1

@@ -169,7 +169,7 @@ main(int argc, char * const argv[])
  			log_file = optarg;
  			break;
  		case 'p':
-			pidfile = pidfile;
+			pidfile = optarg;
  		case 's':
  			vbd_script = optarg;
  			break;

Quoted 7 lines · Roger Pau Monne

# HG changeset patch
# User Roger Pau Monne<[email protected]> # Date 1316692489 -7200
# Node ID 2d77cbdc816bc943e9e69ecca34ae7157079045a # Parent 1d3830f8a7306088b49d5732b5e88a73c2bc0315
xenbackendd: pass type of block device to hotplug script

Quoted 3 lines

Pass the type of block device to attach to the block script instead of reading it from xenstore, since new Xen versions don't make a difference between a block device or an image.

Signed-off-by Roger Pau Monne<[email protected]>

I've not got any problem with this one, but I don't think my ACK is worth much since it's NetBSD and I'm not really qualified, neverless:

Acked-by Ian Campbell<[email protected]>

Quoted 92 lines

diff -r 1d3830f8a730 -r 2d77cbdc816b tools/hotplug/NetBSD/block

tools/hotplug/NetBSD/block +1 -1

@@ -19,7 +19,7 @@ error() {
 
  xpath=$1
  xstatus=$2
-xtype=$(xenstore-read "$xpath/type")
+xtype=$3
  xparams=$(xenstore-read "$xpath/params")
 
  case $xstatus in

diff -r 1d3830f8a730 -r 2d77cbdc816b tools/xenbackendd/xenbackendd.c

tools/xenbackendd/xenbackendd.c +35 -5

@@ -89,15 +89,15 @@ dodebug(const char *fmt, ...)
  }
 
  static void
-doexec(const char *cmd, const char *arg1, const char *arg2)
+doexec(const char *cmd, const char *arg1, const char *arg2, const char *arg3)
  {
-	dodebug("exec %s %s %s", cmd, arg1, arg2);
+	dodebug("exec %s %s %s %s", cmd, arg1, arg2, arg3);
  	switch(vfork()) {
  	case -1:
  		dolog(LOG_ERR, "can't vfork: %s", strerror(errno));
  		break;
  	case 0:
-		execl(cmd, cmd, arg1, arg2, NULL);
+		execl(cmd, cmd, arg1, arg2, arg3, NULL);
  		dolog(LOG_ERR, "can't exec %s: %s", cmd, strerror(errno));
  		exit(EXIT_FAILURE);
  		/* NOTREACHED */

@@ -145,11 +145,14 @@ xen_setup(void)
  int
  main(int argc, char * const argv[])
  {
+	struct stat stab;
  	char **vec;
  	unsigned int num;
  	char *s;
  	int state;
  	char *sstate;
+	char *stype;
+	char *params;
  	char *p;
  	char buf[80];
  	int type;

@@ -297,11 +300,38 @@ main(int argc, char * const argv[])
  				    strerror(errno));
  				goto next2;
  			}
-			doexec(s, vec[XS_WATCH_PATH], sstate);
+			doexec(s, vec[XS_WATCH_PATH], sstate, NULL);
  			break;
 
  		case DEVTYPE_VBD:
-			doexec(vbd_script, vec[XS_WATCH_PATH], sstate);
+			/* check if given file is a block device or a raw image */
+			snprintf(buf, sizeof(buf), "%s/params", vec[XS_WATCH_PATH]);
+			params = xs_read(xs, XBT_NULL, buf, 0);
+			if(params == NULL) {
+				dolog(LOG_ERR,
+					"Failed to read %s (%s)", buf, strerror(errno));
+				goto next2;
+			}
+			if (stat(params,&stab)<  0) {
+				dolog(LOG_ERR,
+					"Failed to get info about %s (%s)", params,
+					strerror(errno));
+				goto next3;
+			}
+			stype = NULL;
+			if (S_ISBLK(stab.st_mode))
+				stype = "phy";
+			if (S_ISREG(stab.st_mode))
+				stype = "file";
+			if (stype == NULL) {
+				dolog(LOG_ERR,
+					"Failed to attach %s (not a block device or raw image)",
+					params, strerror(errno));
+				goto next3;
+			}
+			doexec(vbd_script, vec[XS_WATCH_PATH], sstate, stype);
+next3:
+			free(params);
  			break;
 
  		default:

I wonder if we can remove the hard coding of the VBD special case somehow? For example an ops struct in an array mapping DEVICE_* to int (*watch_for_disconnect)(relevant arguments)
       int (*has_disconnected)(relevant arguments)
which would have two implementations, one checking state and the other hotplug-status.

That leaves the change in wait_for_dev_destroy which unfortunately doesn't have the context to do much else than what you've done. Perhaps that's ok as is until I can finish of the patch series I have which fixes that aspect. I suppose a function pointer could be encoded in the XS_WATCH_TOKEN and sscanf'd back out again...