249 lines
6.4 KiB
Diff
249 lines
6.4 KiB
Diff
Index: xen-3.3.1-testing/tools/blktap/drivers/blktapctrl.c
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===================================================================
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--- xen-3.3.1-testing.orig/tools/blktap/drivers/blktapctrl.c
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+++ xen-3.3.1-testing/tools/blktap/drivers/blktapctrl.c
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@@ -662,9 +662,6 @@ static int blktapctrl_new_blkif(blkif_t
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DPRINTF("Received a poll for a new vbd\n");
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if ( ((blk=blkif->info) != NULL) && (blk->params != NULL) ) {
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- if (blktap_interface_create(ctlfd, &major, &minor, blkif) < 0)
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- return -1;
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-
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if (test_path(blk->params, &ptr, &type, &exist, &use_ioemu) != 0) {
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DPRINTF("Error in blktap device string(%s).\n",
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blk->params);
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@@ -693,10 +690,6 @@ static int blktapctrl_new_blkif(blkif_t
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blkif->fds[WRITE] = exist->fds[WRITE];
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}
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- add_disktype(blkif, type);
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- blkif->major = major;
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- blkif->minor = minor;
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-
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image = (image_t *)malloc(sizeof(image_t));
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blkif->prv = (void *)image;
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blkif->ops = &tapdisk_ops;
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@@ -720,11 +713,18 @@ static int blktapctrl_new_blkif(blkif_t
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goto fail;
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}
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+ if (blktap_interface_create(ctlfd, &major, &minor, blkif) < 0)
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+ return -1;
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+
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+ blkif->major = major;
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+ blkif->minor = minor;
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+
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+ add_disktype(blkif, type);
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+
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} else return -1;
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return 0;
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fail:
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- ioctl(ctlfd, BLKTAP_IOCTL_FREEINTF, minor);
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return -EINVAL;
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}
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Index: xen-3.3.1-testing/tools/blktap/lib/xenbus.c
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===================================================================
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--- xen-3.3.1-testing.orig/tools/blktap/lib/xenbus.c
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+++ xen-3.3.1-testing/tools/blktap/lib/xenbus.c
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@@ -48,6 +48,7 @@
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#include <poll.h>
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#include <time.h>
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#include <sys/time.h>
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+#include <unistd.h>
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#include "blktaplib.h"
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#include "list.h"
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#include "xs_api.h"
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@@ -149,6 +150,130 @@ static int backend_remove(struct xs_hand
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return 0;
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}
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+static int check_sharing(struct xs_handle *h, struct backend_info *be)
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+{
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+ char *dom_uuid;
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+ char *cur_dom_uuid;
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+ char *path;
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+ char *mode;
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+ char *params;
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+ char **domains;
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+ char **devices;
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+ int i, j;
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+ unsigned int num_dom, num_dev;
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+ blkif_info_t *info;
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+ int ret = 0;
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+
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+ /* If the mode contains '!' or doesn't contain 'w' don't check anything */
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+ xs_gather(h, be->backpath, "mode", NULL, &mode, NULL);
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+ if (strchr(mode, '!'))
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+ goto out;
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+ if (strchr(mode, 'w') == NULL)
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+ goto out;
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+
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+ /* Get the UUID of the domain we want to attach to */
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+ if (asprintf(&path, "/local/domain/%ld", be->frontend_id) == -1)
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+ goto fail;
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+ xs_gather(h, path, "vm", NULL, &dom_uuid, NULL);
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+ free(path);
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+
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+ /* Iterate through the devices of all VMs */
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+ domains = xs_directory(h, XBT_NULL, "backend/tap", &num_dom);
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+ if (domains == NULL)
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+ num_dom = 0;
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+
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+ for (i = 0; !ret && (i < num_dom); i++) {
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+
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+ /* If it's the same VM, no action needed */
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+ if (asprintf(&path, "/local/domain/%s", domains[i]) == -1) {
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+ ret = -1;
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+ break;
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+ }
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+ xs_gather(h, path, "vm", NULL, &cur_dom_uuid, NULL);
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+ free(path);
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+
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+ if (!strcmp(cur_dom_uuid, dom_uuid)) {
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+ free(cur_dom_uuid);
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+ continue;
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+ }
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+
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+ /* Check the devices */
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+ if (asprintf(&path, "backend/tap/%s", domains[i]) == -1) {
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+ ret = -1;
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+ free(cur_dom_uuid);
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+ break;
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+ }
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+ devices = xs_directory(h, XBT_NULL, path, &num_dev);
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+ if (devices == NULL)
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+ num_dev = 0;
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+ free(path);
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+
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+ for (j = 0; !ret && (j < num_dev); j++) {
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+ if (asprintf(&path, "backend/tap/%s/%s", domains[i], devices[j]) == -1) {
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+ ret = -1;
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+ break;
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+ }
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+ xs_gather(h, path, "params", NULL, ¶ms, NULL);
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+ free(path);
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+
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+ info = be->blkif->info;
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+ if (strcmp(params, info->params)) {
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+ ret = -1;
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+ }
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+
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+ free(params);
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+ }
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+
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+ free(cur_dom_uuid);
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+ free(devices);
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+ }
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+ free(domains);
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+ free(dom_uuid);
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+ goto out;
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+
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+fail:
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+ ret = -1;
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+out:
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+ free(mode);
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+ return ret;
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+}
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+
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+static int check_image(struct xs_handle *h, struct backend_info *be,
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+ const char** errmsg)
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+{
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+ const char *path;
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+ int mode;
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+ blkif_t *blkif = be->blkif;
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+ blkif_info_t *info = blkif->info;
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+
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+ /* Strip off the image type */
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+ path = strchr(info->params, ':');
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+ if (path == NULL)
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+ path = info->params;
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+ else
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+ path++;
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+
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+ /* Check if the image exists and access is permitted */
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+ mode = R_OK;
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+ if (!be->readonly)
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+ mode |= W_OK;
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+ if (access(path, mode)) {
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+ if (errno == ENOENT)
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+ *errmsg = "File not found.";
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+ else
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+ *errmsg = "Insufficient file permissions.";
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+ return -1;
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+ }
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+
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+ /* Check that the image is not attached to a different VM */
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+ if (check_sharing(h, be)) {
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+ *errmsg = "File already in use by other domain";
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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static void ueblktap_setup(struct xs_handle *h, char *bepath)
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{
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struct backend_info *be;
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@@ -156,6 +281,7 @@ static void ueblktap_setup(struct xs_han
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int len, er, deverr;
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long int pdev = 0, handle;
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blkif_info_t *blk;
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+ const char* errmsg = NULL;
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be = be_lookup_be(bepath);
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if (be == NULL)
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@@ -211,6 +337,9 @@ static void ueblktap_setup(struct xs_han
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be->pdev = pdev;
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}
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+ if (check_image(h, be, &errmsg))
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+ goto fail;
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+
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er = blkif_init(be->blkif, handle, be->pdev, be->readonly);
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if (er != 0) {
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DPRINTF("Unable to open device %s\n",blk->params);
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@@ -246,12 +375,21 @@ static void ueblktap_setup(struct xs_han
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}
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be->blkif->state = CONNECTED;
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+ xs_printf(h, be->backpath, "hotplug-status", "connected");
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+
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DPRINTF("[SETUP] Complete\n\n");
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goto close;
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fail:
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- if ( (be != NULL) && (be->blkif != NULL) )
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+ if (be) {
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+ if (errmsg == NULL)
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+ errmsg = "Setting up the backend failed. See the log "
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+ "files in /var/log/xen/ for details.";
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+ xs_printf(h, be->backpath, "hotplug-error", errmsg);
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+ xs_printf(h, be->backpath, "hotplug-status", "error");
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+
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backend_remove(h, be);
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+ }
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close:
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if (path)
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free(path);
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@@ -286,7 +424,8 @@ static void ueblktap_probe(struct xs_han
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len = strsep_len(bepath, '/', 7);
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if (len < 0)
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goto free_be;
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- bepath[len] = '\0';
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+ if (bepath[len] != '\0')
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+ goto free_be;
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be = malloc(sizeof(*be));
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if (!be) {
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Index: xen-3.3.1-testing/tools/examples/xen-backend.rules
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===================================================================
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--- xen-3.3.1-testing.orig/tools/examples/xen-backend.rules
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+++ xen-3.3.1-testing/tools/examples/xen-backend.rules
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@@ -1,4 +1,3 @@
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-SUBSYSTEM=="xen-backend", KERNEL=="tap*", RUN+="/etc/xen/scripts/blktap $env{ACTION}"
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SUBSYSTEM=="xen-backend", KERNEL=="vbd*", RUN+="/etc/xen/scripts/block $env{ACTION}"
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SUBSYSTEM=="xen-backend", KERNEL=="vtpm*", RUN+="/etc/xen/scripts/vtpm $env{ACTION}"
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SUBSYSTEM=="xen-backend", KERNEL=="vif*", ACTION=="online", RUN+="$env{script} online"
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