X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=qemu-io-cmds.c;h=2c48f9ce1a6d81f8f992f8c942e52253dafae45e;hb=aa262928595d431bfee7914cb7d9d79197f887a2;hp=95bcde1d881da0d5a287f357c1408b4b2ce56806;hpb=6bc56d317f7b5004ea2d89d264bddc8b4d081700;p=mirror_qemu.git

diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 95bcde1d88..2c48f9ce1a 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -83,6 +83,29 @@ static int command(BlockBackend *blk, const cmdinfo_t *ct, int argc,
         }
         return 0;
     }
+
+    /* Request additional permissions if necessary for this command. The caller
+     * is responsible for restoring the original permissions afterwards if this
+     * is what it wants. */
+    if (ct->perm && blk_is_available(blk)) {
+        uint64_t orig_perm, orig_shared_perm;
+        blk_get_perm(blk, &orig_perm, &orig_shared_perm);
+
+        if (ct->perm & ~orig_perm) {
+            uint64_t new_perm;
+            Error *local_err = NULL;
+            int ret;
+
+            new_perm = orig_perm | ct->perm;
+
+            ret = blk_set_perm(blk, new_perm, orig_shared_perm, &local_err);
+            if (ret < 0) {
+                error_report_err(local_err);
+                return 0;
+            }
+        }
+    }
+
     optind = 0;
     return ct->cfunc(blk, argc, argv);
 }
@@ -137,15 +160,17 @@ static char **breakline(char *input, int *count)
 
 static int64_t cvtnum(const char *s)
 {
-    char *end;
-    int64_t ret;
+    int err;
+    uint64_t value;
 
-    ret = qemu_strtosz_suffix(s, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
-    if (*end != '\0') {
-        /* Detritus at the end of the string */
-        return -EINVAL;
+    err = qemu_strtosz(s, NULL, &value);
+    if (err < 0) {
+        return err;
+    }
+    if (value > INT64_MAX) {
+        return -ERANGE;
     }
-    return ret;
+    return value;
 }
 
 static void print_cvtnum_err(int64_t rc, const char *arg)
@@ -388,9 +413,15 @@ create_iovec(BlockBackend *blk, QEMUIOVector *qiov, char **argv, int nr_iov,
             goto fail;
         }
 
-        if (len > SIZE_MAX) {
-            printf("Argument '%s' exceeds maximum size %llu\n", arg,
-                   (unsigned long long)SIZE_MAX);
+        if (len > BDRV_REQUEST_MAX_BYTES) {
+            printf("Argument '%s' exceeds maximum size %" PRIu64 "\n", arg,
+                   (uint64_t)BDRV_REQUEST_MAX_BYTES);
+            goto fail;
+        }
+
+        if (count > BDRV_REQUEST_MAX_BYTES - len) {
+            printf("The total number of bytes exceed the maximum size %" PRIu64
+                   "\n", (uint64_t)BDRV_REQUEST_MAX_BYTES);
             goto fail;
         }
 
@@ -682,9 +713,9 @@ static int read_f(BlockBackend *blk, int argc, char **argv)
     if (count < 0) {
         print_cvtnum_err(count, argv[optind]);
         return 0;
-    } else if (count > SIZE_MAX) {
+    } else if (count > BDRV_REQUEST_MAX_BYTES) {
         printf("length cannot exceed %" PRIu64 ", given %s\n",
-               (uint64_t) SIZE_MAX, argv[optind]);
+               (uint64_t)BDRV_REQUEST_MAX_BYTES, argv[optind]);
         return 0;
     }
 
@@ -910,6 +941,7 @@ static const cmdinfo_t write_cmd = {
     .name       = "write",
     .altname    = "w",
     .cfunc      = write_f,
+    .perm       = BLK_PERM_WRITE,
     .argmin     = 2,
     .argmax     = -1,
     .args       = "[-bcCfquz] [-P pattern] off len",
@@ -1004,9 +1036,9 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
     if (count < 0) {
         print_cvtnum_err(count, argv[optind]);
         return 0;
-    } else if (count > SIZE_MAX) {
+    } else if (count > BDRV_REQUEST_MAX_BYTES) {
         printf("length cannot exceed %" PRIu64 ", given %s\n",
-               (uint64_t) SIZE_MAX, argv[optind]);
+               (uint64_t)BDRV_REQUEST_MAX_BYTES, argv[optind]);
         return 0;
     }
 
@@ -1085,6 +1117,7 @@ static int writev_f(BlockBackend *blk, int argc, char **argv);
 static const cmdinfo_t writev_cmd = {
     .name       = "writev",
     .cfunc      = writev_f,
+    .perm       = BLK_PERM_WRITE,
     .argmin     = 2,
     .argmax     = -1,
     .args       = "[-Cfq] [-P pattern] off len [len..]",
@@ -1384,6 +1417,7 @@ static int aio_write_f(BlockBackend *blk, int argc, char **argv);
 static const cmdinfo_t aio_write_cmd = {
     .name       = "aio_write",
     .cfunc      = aio_write_f,
+    .perm       = BLK_PERM_WRITE,
     .argmin     = 2,
     .argmax     = -1,
     .args       = "[-Cfiquz] [-P pattern] off len [len..]",
@@ -1548,6 +1582,7 @@ static const cmdinfo_t truncate_cmd = {
     .name       = "truncate",
     .altname    = "t",
     .cfunc      = truncate_f,
+    .perm       = BLK_PERM_WRITE | BLK_PERM_RESIZE,
     .argmin     = 1,
     .argmax     = 1,
     .args       = "off",
@@ -1645,6 +1680,7 @@ static const cmdinfo_t discard_cmd = {
     .name       = "discard",
     .altname    = "d",
     .cfunc      = discard_f,
+    .perm       = BLK_PERM_WRITE,
     .argmin     = 2,
     .argmax     = -1,
     .args       = "[-Cq] off len",