Fix Sparc64 sign extension problems

[qemu] / qemu-img.c

diff --git a/qemu-img.c b/qemu-img.c
index ab380c8..29149a2 100644 (file)
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -58,6 +58,7 @@ static void help(void)
            "QEMU disk image utility\n"
            "\n"
            "Command syntax:\n"
+           "  check [-f fmt] filename\n"
            "  create [-e] [-6] [-F fmt] [-b base_image] [-f fmt] filename [size]\n"
            "  commit [-f fmt] filename\n"
            "  convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] [-B output_base_image] filename [filename2 [...]] output_filename\n"
@@ -306,6 +307,8 @@ static int img_create(int argc, char **argv)
     if (ret < 0) {
         if (ret == -ENOTSUP) {
             error("Formatting or formatting option not supported for file format '%s'", fmt);
+        } else if (ret == -EFBIG) {
+            error("The image size is too large for file format '%s'", fmt);
         } else {
             error("Error while formatting");
         }
@@ -313,6 +316,65 @@ static int img_create(int argc, char **argv)
     return 0;
 }
 
+static int img_check(int argc, char **argv)
+{
+    int c, ret;
+    const char *filename, *fmt;
+    BlockDriver *drv;
+    BlockDriverState *bs;
+
+    fmt = NULL;
+    for(;;) {
+        c = getopt(argc, argv, "f:h");
+        if (c == -1)
+            break;
+        switch(c) {
+        case 'h':
+            help();
+            break;
+        case 'f':
+            fmt = optarg;
+            break;
+        }
+    }
+    if (optind >= argc)
+        help();
+    filename = argv[optind++];
+
+    bs = bdrv_new("");
+    if (!bs)
+        error("Not enough memory");
+    if (fmt) {
+        drv = bdrv_find_format(fmt);
+        if (!drv)
+            error("Unknown file format '%s'", fmt);
+    } else {
+        drv = NULL;
+    }
+    if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
+        error("Could not open '%s'", filename);
+    }
+    ret = bdrv_check(bs);
+    switch(ret) {
+    case 0:
+        printf("No errors were found on the image.\n");
+        break;
+    case -ENOTSUP:
+        error("This image format does not support checks");
+        break;
+    default:
+        if (ret < 0) {
+            error("An error occurred during the check");
+        } else {
+            printf("%d errors were found on the image.\n", ret);
+        }
+        break;
+    }
+
+    bdrv_delete(bs);
+    return 0;
+}
+
 static int img_commit(int argc, char **argv)
 {
     int c, ret;
@@ -493,7 +555,9 @@ static int img_convert(int argc, char **argv)
     ret = bdrv_create(drv, out_filename, total_sectors, out_baseimg, flags);
     if (ret < 0) {
         if (ret == -ENOTSUP) {
-            error("Formatting not supported for file format '%s'", fmt);
+            error("Formatting not supported for file format '%s'", out_fmt);
+        } else if (ret == -EFBIG) {
+            error("The image size is too large for file format '%s'", out_fmt);
         } else {
             error("Error while formatting '%s'", out_filename);
         }
@@ -592,18 +656,17 @@ static int img_convert(int argc, char **argv)
             if (n > bs_offset + bs_sectors - sector_num)
                 n = bs_offset + bs_sectors - sector_num;
 
-            /* If the output image is being created as a copy on write image,
-               assume that sectors which are unallocated in the input image
-               are present in both the output's and input's base images (no
-               need to copy them). */
-            if (out_baseimg) {
-               if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, n, &n1)) {
-                  sector_num += n1;
-                  continue;
-               }
-               /* The next 'n1' sectors are allocated in the input image. Copy
-                  only those as they may be followed by unallocated sectors. */
-               n = n1;
+            if (drv != &bdrv_host_device) {
+                if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
+                                       n, &n1)) {
+                    sector_num += n1;
+                    continue;
+                }
+                /* The next 'n1' sectors are allocated in the input image. Copy
+                   only those as they may be followed by unallocated sectors. */
+                n = n1;
+            } else {
+                n1 = n;
             }
 
             if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) 
@@ -615,8 +678,13 @@ static int img_convert(int argc, char **argv)
             while (n > 0) {
                 /* If the output image is being created as a copy on write image,
                    copy all sectors even the ones containing only NUL bytes,
-                   because they may differ from the sectors in the base image. */
-                if (out_baseimg || is_allocated_sectors(buf1, n, &n1)) {
+                   because they may differ from the sectors in the base image.
+
+                   If the output is to a host device, we also write out
+                   sectors that are entirely 0, since whatever data was
+                   already there is garbage, not 0s. */
+                if (drv == &bdrv_host_device || out_baseimg ||
+                    is_allocated_sectors(buf1, n, &n1)) {
                     if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
                         error("error while writing");
                 }
@@ -880,6 +948,8 @@ int main(int argc, char **argv)
     argc--; argv++;
     if (!strcmp(cmd, "create")) {
         img_create(argc, argv);
+    } else if (!strcmp(cmd, "check")) {
+        img_check(argc, argv);
     } else if (!strcmp(cmd, "commit")) {
         img_commit(argc, argv);
     } else if (!strcmp(cmd, "convert")) {