new disk image layer

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1037 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 677 insertions, 0 deletions

diff --git a/qemu-img.c b/qemu-img.c
new file mode 100644
index 0000000..480dff9
--- /dev/null
+++ b/qemu-img.c
@@ -0,0 +1,677 @@
+/*
+ * create a COW disk image
+ * 
+ * Copyright (c) 2003 Fabrice Bellard
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "vl.h"
+
+void *get_mmap_addr(unsigned long size)
+{
+    return NULL;
+}
+
+void qemu_free(void *ptr)
+{
+    free(ptr);
+}
+
+void *qemu_malloc(size_t size)
+{
+    return malloc(size);
+}
+
+void *qemu_mallocz(size_t size)
+{
+    void *ptr;
+    ptr = qemu_malloc(size);
+    if (!ptr)
+        return NULL;
+    memset(ptr, 0, size);
+    return ptr;
+}
+
+char *qemu_strdup(const char *str)
+{
+    char *ptr;
+    ptr = qemu_malloc(strlen(str) + 1);
+    if (!ptr)
+        return NULL;
+    strcpy(ptr, str);
+    return ptr;
+}
+
+void pstrcpy(char *buf, int buf_size, const char *str)
+{
+    int c;
+    char *q = buf;
+
+    if (buf_size <= 0)
+        return;
+
+    for(;;) {
+        c = *str++;
+        if (c == 0 || q >= buf + buf_size - 1)
+            break;
+        *q++ = c;
+    }
+    *q = '\0';
+}
+
+/* strcat and truncate. */
+char *pstrcat(char *buf, int buf_size, const char *s)
+{
+    int len;
+    len = strlen(buf);
+    if (len < buf_size) 
+        pstrcpy(buf + len, buf_size - len, s);
+    return buf;
+}
+
+int strstart(const char *str, const char *val, const char **ptr)
+{
+    const char *p, *q;
+    p = str;
+    q = val;
+    while (*q != '\0') {
+        if (*p != *q)
+            return 0;
+        p++;
+        q++;
+    }
+    if (ptr)
+        *ptr = p;
+    return 1;
+}
+
+void term_printf(const char *fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    vprintf(fmt, ap);
+    va_end(ap);
+}
+
+void __attribute__((noreturn)) error(const char *fmt, ...) 
+{
+    va_list ap;
+    va_start(ap, fmt);
+    fprintf(stderr, "qemuimg: ");
+    vfprintf(stderr, fmt, ap);
+    fprintf(stderr, "\n");
+    exit(1);
+    va_end(ap);
+}
+
+static void format_print(void *opaque, const char *name)
+{
+    printf(" %s", name);
+}
+
+void help(void)
+{
+    printf("qemuimg version " QEMU_VERSION ", Copyright (c) 2004 Fabrice Bellard\n"
+           "usage: qemuimg command [command options]\n"
+           "QEMU disk image utility\n"
+           "\n"
+           "Command syntax:\n"
+           "  create [-e] [-b base_image] [-f fmt] filename [size]\n"
+           "  commit [-f fmt] filename\n"
+           "  convert [-c] [-e] [-f fmt] filename [-O output_fmt] output_filename\n"
+           "  info [-f fmt] filename\n"
+           "\n"
+           "Command parameters:\n"
+           "  'filename' is a disk image filename\n"
+           "  'base_image' is the read-only disk image which is used as base for a copy on\n"
+           "    write image; the copy on write image only stores the modified data\n"
+           "  'fmt' is the disk image format. It is guessed automatically in most cases\n"
+           "  'size' is the disk image size in kilobytes. Optional suffixes 'M' (megabyte)\n"
+           "    and 'G' (gigabyte) are supported\n"
+           "  'output_filename' is the destination disk image filename\n"
+           "  'output_fmt' is the destination format\n"
+           "  '-c' indicates that target image must be compressed (qcow format only)\n"
+           "  '-e' indicates that the target image must be encrypted (qcow format only)\n"
+           );
+    printf("\nSupported format:");
+    bdrv_iterate_format(format_print, NULL);
+    printf("\n");
+    exit(1);
+}
+
+
+#define NB_SUFFIXES 4
+
+static void get_human_readable_size(char *buf, int buf_size, int64_t size)
+{
+    char suffixes[NB_SUFFIXES] = "KMGT";
+    int64_t base;
+    int i;
+
+    if (size <= 999) {
+        snprintf(buf, buf_size, "%lld", size);
+    } else {
+        base = 1024;
+        for(i = 0; i < NB_SUFFIXES; i++) {
+            if (size < (10 * base)) {
+                snprintf(buf, buf_size, "%0.1f%c", 
+                         (double)size / base,
+                         suffixes[i]);
+                break;
+            } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
+                snprintf(buf, buf_size, "%lld%c", 
+                         (size + (base >> 1)) / base,
+                         suffixes[i]);
+                break;
+            }
+            base = base * 1024;
+        }
+    }
+}
+
+#if defined(WIN32)
+/* XXX: put correct support for win32 */
+static int read_password(char *buf, int buf_size)
+{
+    int c, i;
+    printf("Password: ");
+    fflush(stdout);
+    i = 0;
+    for(;;) {
+        c = getchar();
+        if (c == '\n')
+            break;
+        if (i < (buf_size - 1))
+            buf[i++] = c;
+    }
+    buf[i] = '\0';
+    return 0;
+}
+
+#else
+
+#include <termios.h>
+
+static struct termios oldtty;
+
+static void term_exit(void)
+{
+    tcsetattr (0, TCSANOW, &oldtty);
+}
+
+static void term_init(void)
+{
+    struct termios tty;
+
+    tcgetattr (0, &tty);
+    oldtty = tty;
+
+    tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
+                          |INLCR|IGNCR|ICRNL|IXON);
+    tty.c_oflag |= OPOST;
+    tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
+    tty.c_cflag &= ~(CSIZE|PARENB);
+    tty.c_cflag |= CS8;
+    tty.c_cc[VMIN] = 1;
+    tty.c_cc[VTIME] = 0;
+    
+    tcsetattr (0, TCSANOW, &tty);
+
+    atexit(term_exit);
+}
+
+int read_password(char *buf, int buf_size)
+{
+    uint8_t ch;
+    int i, ret;
+
+    printf("password: ");
+    fflush(stdout);
+    term_init();
+    i = 0;
+    for(;;) {
+        ret = read(0, &ch, 1);
+        if (ret == -1) {
+            if (errno == EAGAIN || errno == EINTR) {
+                continue;
+            } else {
+                ret = -1;
+                break;
+            }
+        } else if (ret == 0) {
+            ret = -1;
+            break;
+        } else {
+            if (ch == '\r') {
+                ret = 0;
+                break;
+            }
+            if (i < (buf_size - 1))
+                buf[i++] = ch;
+        }
+    }
+    term_exit();
+    buf[i] = '\0';
+    printf("\n");
+    return ret;
+}
+#endif
+
+static int img_create(int argc, char **argv)
+{
+    int c, ret, encrypted;
+    const char *fmt = "raw";
+    const char *filename;
+    const char *base_filename = NULL;
+    int64_t size;
+    const char *p;
+    BlockDriver *drv;
+    
+    encrypted = 0;
+    for(;;) {
+        c = getopt(argc, argv, "b:f:he");
+        if (c == -1)
+            break;
+        switch(c) {
+        case 'h':
+            help();
+            break;
+        case 'b':
+            base_filename = optarg;
+            break;
+        case 'f':
+            fmt = optarg;
+            break;
+        case 'e':
+            encrypted = 1;
+            break;
+        }
+    }
+    optind++;
+    if (optind >= argc) 
+        help();
+    filename = argv[optind++];
+    size = 0;
+    if (!base_filename) {
+        if (optind >= argc)
+            help();
+        p = argv[optind];
+        size = strtoul(p, (char **)&p, 0);
+        if (*p == 'M') {
+            size *= 1024 * 1024;
+        } else if (*p == 'G') {
+            size *= 1024 * 1024 * 1024;
+        } else if (*p == 'k' || *p == 'K' || *p == '\0') {
+            size *= 1024;
+        } else {
+            help();
+        }
+    }
+    drv = bdrv_find_format(fmt);
+    if (!drv)
+        error("Unknown file format '%s'", fmt);
+    printf("Formating '%s', fmt=%s",
+           filename, fmt);
+    if (encrypted)
+        printf(", encrypted");
+    if (base_filename)
+        printf(", backing_file=%s\n",
+               base_filename);
+    else
+        printf(", size=%lld kB\n", size / 1024);
+    ret = bdrv_create(drv, filename, size / 512, base_filename, encrypted);
+    if (ret < 0) {
+        if (ret == -ENOTSUP) {
+            error("Formatting or formatting option not suppored for file format '%s'", fmt);
+        } else {
+            error("Error while formatting");
+        }
+    }
+    return 0;
+}
+
+static int img_commit(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;
+        }
+    }
+    optind++;
+    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, 0, drv) < 0) {
+        error("Could not open '%s'", filename);
+    }
+    ret = bdrv_commit(bs);
+    switch(ret) {
+    case 0:
+        printf("Image committed.\n");
+        break;
+    case -ENOENT:
+        error("No disk inserted");
+        break;
+    case -EACCES:
+        error("Image is read-only");
+        break;
+    case -ENOTSUP:
+        error("Image is already committed");
+        break;
+    default:
+        error("Error while committing image");
+        break;
+    }
+
+    bdrv_delete(bs);
+    return 0;
+}
+
+static int is_not_zero(const uint8_t *sector, int len)
+{
+    int i;
+    len >>= 2;
+    for(i = 0;i < len; i++) {
+        if (((uint32_t *)sector)[i] != 0)
+            return 1;
+    }
+    return 0;
+}
+
+static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
+{
+    int v, i;
+
+    if (n <= 0) {
+        *pnum = 0;
+        return 0;
+    }
+    v = is_not_zero(buf, 512);
+    for(i = 1; i < n; i++) {
+        buf += 512;
+        if (v != is_not_zero(buf, 512))
+            break;
+    }
+    *pnum = i;
+    return v;
+}
+
+static BlockDriverState *bdrv_new_open(const char *filename,
+                                       const char *fmt)
+{
+    BlockDriverState *bs;
+    BlockDriver *drv;
+    char password[256];
+
+    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, 0, drv) < 0) {
+        error("Could not open '%s'", filename);
+    }
+    if (bdrv_is_encrypted(bs)) {
+        printf("Disk image '%s' is encrypted.\n", filename);
+        if (read_password(password, sizeof(password)) < 0)
+            error("No password given");
+        if (bdrv_set_key(bs, password) < 0)
+            error("invalid password");
+    }
+    return bs;
+}
+
+#define IO_BUF_SIZE 65536
+
+static int img_convert(int argc, char **argv)
+{
+    int c, ret, n, n1, compress, cluster_size, cluster_sectors, encrypt;
+    const char *filename, *fmt, *out_fmt, *out_filename;
+    BlockDriver *drv;
+    BlockDriverState *bs, *out_bs;
+    int64_t total_sectors, nb_sectors, sector_num;
+    uint8_t buf[IO_BUF_SIZE];
+    const uint8_t *buf1;
+
+    fmt = NULL;
+    out_fmt = "raw";
+    compress = 0;
+    encrypt = 0;
+    for(;;) {
+        c = getopt(argc, argv, "f:O:hce");
+        if (c == -1)
+            break;
+        switch(c) {
+        case 'h':
+            help();
+            break;
+        case 'f':
+            fmt = optarg;
+            break;
+        case 'O':
+            out_fmt = optarg;
+            break;
+        case 'c':
+            compress = 1;
+            break;
+        case 'e':
+            encrypt = 1;
+            break;
+        }
+    }
+    optind++;
+    if (optind >= argc) 
+        help();
+    filename = argv[optind++];
+    if (optind >= argc) 
+        help();
+    out_filename = argv[optind++];
+    
+    bs = bdrv_new_open(filename, fmt);
+
+    drv = bdrv_find_format(out_fmt);
+    if (!drv)
+        error("Unknown file format '%s'", fmt);
+    if (compress && drv != &bdrv_qcow)
+        error("Compression not supported for this file format");
+    if (encrypt && drv != &bdrv_qcow)
+        error("Encryption not supported for this file format");
+    if (compress && encrypt)
+        error("Compression and encryption not supported at the same time");
+    bdrv_get_geometry(bs, &total_sectors);
+    ret = bdrv_create(drv, out_filename, total_sectors, NULL, encrypt);
+    if (ret < 0) {
+        if (ret == -ENOTSUP) {
+            error("Formatting not suppored for file format '%s'", fmt);
+        } else {
+            error("Error while formatting '%s'", out_filename);
+        }
+    }
+    
+    out_bs = bdrv_new_open(out_filename, out_fmt);
+
+    if (compress) {
+        cluster_size = qcow_get_cluster_size(out_bs);
+        if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
+            error("invalid cluster size");
+        cluster_sectors = cluster_size >> 9;
+        sector_num = 0;
+        for(;;) {
+            nb_sectors = total_sectors - sector_num;
+            if (nb_sectors <= 0)
+                break;
+            if (nb_sectors >= cluster_sectors)
+                n = cluster_sectors;
+            else
+                n = nb_sectors;
+            if (bdrv_read(bs, sector_num, buf, n) < 0) 
+                error("error while reading");
+            if (n < cluster_sectors)
+                memset(buf + n * 512, 0, cluster_size - n * 512);
+            if (is_not_zero(buf, cluster_size)) {
+                if (qcow_compress_cluster(out_bs, sector_num, buf) != 0)
+                    error("error while compressing sector %lld", sector_num);
+            }
+            sector_num += n;
+        }
+    } else {
+        sector_num = 0;
+        for(;;) {
+            nb_sectors = total_sectors - sector_num;
+            if (nb_sectors <= 0)
+                break;
+            if (nb_sectors >= (IO_BUF_SIZE / 512))
+                n = (IO_BUF_SIZE / 512);
+            else
+                n = nb_sectors;
+            if (bdrv_read(bs, sector_num, buf, n) < 0) 
+                error("error while reading");
+            /* NOTE: at the same time we convert, we do not write zero
+               sectors to have a chance to compress the image. Ideally, we
+               should add a specific call to have the info to go faster */
+            buf1 = buf;
+            while (n > 0) {
+                if (is_allocated_sectors(buf1, n, &n1)) {
+                    if (bdrv_write(out_bs, sector_num, buf1, n1) < 0) 
+                        error("error while writing");
+                }
+                sector_num += n1;
+                n -= n1;
+                buf1 += n1 * 512;
+            }
+        }
+    }
+    bdrv_delete(out_bs);
+    bdrv_delete(bs);
+    return 0;
+}
+
+static int img_info(int argc, char **argv)
+{
+    int c;
+    const char *filename, *fmt;
+    BlockDriver *drv;
+    BlockDriverState *bs;
+    char fmt_name[128], size_buf[128], dsize_buf[128];
+    int64_t total_sectors;
+    struct stat st;
+
+    fmt = NULL;
+    for(;;) {
+        c = getopt(argc, argv, "f:h");
+        if (c == -1)
+            break;
+        switch(c) {
+        case 'h':
+            help();
+            break;
+        case 'f':
+            fmt = optarg;
+            break;
+        }
+    }
+    optind++;
+    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, 0, drv) < 0) {
+        error("Could not open '%s'", filename);
+    }
+    bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
+    bdrv_get_geometry(bs, &total_sectors);
+    get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
+    if (stat(filename, &st) < 0) 
+        error("Could not stat '%s'", filename);
+    get_human_readable_size(dsize_buf, sizeof(dsize_buf), 
+                            (int64_t)st.st_blocks * 512);
+    printf("image: %s\n"
+           "file format: %s\n"
+           "virtual size: %s (%lld bytes)\n"
+           "disk size: %s\n",
+           filename, fmt_name, size_buf, 
+           total_sectors * 512,
+           dsize_buf);
+    if (bdrv_is_encrypted(bs))
+        printf("encrypted: yes\n");
+    bdrv_delete(bs);
+    return 0;
+}
+
+int main(int argc, char **argv)
+{
+    const char *cmd;
+
+    bdrv_init();
+    if (argc < 2)
+        help();
+    cmd = argv[1];
+    if (!strcmp(cmd, "create")) {
+        img_create(argc, argv);
+    } else if (!strcmp(cmd, "commit")) {
+        img_commit(argc, argv);
+    } else if (!strcmp(cmd, "convert")) {
+        img_convert(argc, argv);
+    } else if (!strcmp(cmd, "info")) {
+        img_info(argc, argv);
+    } else {
+        help();
+    }
+    return 0;
+}