upstream: integrate block changes

This large patch upgrades the block support code to the upstream
version available in ba5e7f82169f32ab8163c707d97c799ca09f8924
dated 2010-08-08

Change-Id: I8b24df0c287e72f6620650a4d6a62e1bb315453e

1 files changed, 599 insertions, 0 deletions

diff --git a/blockdev.c b/blockdev.c
new file mode 100644
index 0000000..ff7602b
--- /dev/null
+++ b/blockdev.c
@@ -0,0 +1,599 @@
+/*
+ * QEMU host block devices
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "block.h"
+#include "blockdev.h"
+#include "monitor.h"
+#include "qerror.h"
+#include "qemu-option.h"
+#include "qemu-config.h"
+#include "sysemu.h"
+
+static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
+
+/*
+ * We automatically delete the drive when a device using it gets
+ * unplugged.  Questionable feature, but we can't just drop it.
+ * Device models call blockdev_mark_auto_del() to schedule the
+ * automatic deletion, and generic qdev code calls blockdev_auto_del()
+ * when deletion is actually safe.
+ */
+void blockdev_mark_auto_del(BlockDriverState *bs)
+{
+    DriveInfo *dinfo = drive_get_by_blockdev(bs);
+
+    dinfo->auto_del = 1;
+}
+
+void blockdev_auto_del(BlockDriverState *bs)
+{
+    DriveInfo *dinfo = drive_get_by_blockdev(bs);
+
+    if (dinfo->auto_del) {
+        drive_uninit(dinfo);
+    }
+}
+
+QemuOpts *drive_add(const char *file, const char *fmt, ...)
+{
+    va_list ap;
+    char optstr[1024];
+    QemuOpts *opts;
+
+    va_start(ap, fmt);
+    vsnprintf(optstr, sizeof(optstr), fmt, ap);
+    va_end(ap);
+
+    opts = qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
+    if (!opts) {
+        return NULL;
+    }
+    if (file)
+        qemu_opt_set(opts, "file", file);
+    return opts;
+}
+
+DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
+{
+    DriveInfo *dinfo;
+
+    /* seek interface, bus and unit */
+
+    QTAILQ_FOREACH(dinfo, &drives, next) {
+        if (dinfo->type == type &&
+	    dinfo->bus == bus &&
+	    dinfo->unit == unit)
+            return dinfo;
+    }
+
+    return NULL;
+}
+
+int drive_get_max_bus(BlockInterfaceType type)
+{
+    int max_bus;
+    DriveInfo *dinfo;
+
+    max_bus = -1;
+    QTAILQ_FOREACH(dinfo, &drives, next) {
+        if(dinfo->type == type &&
+           dinfo->bus > max_bus)
+            max_bus = dinfo->bus;
+    }
+    return max_bus;
+}
+
+DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
+{
+    DriveInfo *dinfo;
+
+    QTAILQ_FOREACH(dinfo, &drives, next) {
+        if (dinfo->bdrv == bs) {
+            return dinfo;
+        }
+    }
+    return NULL;
+}
+
+static void bdrv_format_print(void *opaque, const char *name)
+{
+    fprintf(stderr, " %s", name);
+}
+
+void drive_uninit(DriveInfo *dinfo)
+{
+    qemu_opts_del(dinfo->opts);
+    bdrv_delete(dinfo->bdrv);
+    QTAILQ_REMOVE(&drives, dinfo, next);
+    qemu_free(dinfo);
+}
+
+static int parse_block_error_action(const char *buf, int is_read)
+{
+    if (!strcmp(buf, "ignore")) {
+        return BLOCK_ERR_IGNORE;
+    } else if (!is_read && !strcmp(buf, "enospc")) {
+        return BLOCK_ERR_STOP_ENOSPC;
+    } else if (!strcmp(buf, "stop")) {
+        return BLOCK_ERR_STOP_ANY;
+    } else if (!strcmp(buf, "report")) {
+        return BLOCK_ERR_REPORT;
+    } else {
+        fprintf(stderr, "qemu: '%s' invalid %s error action\n",
+            buf, is_read ? "read" : "write");
+        return -1;
+    }
+}
+
+DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi, int *fatal_error)
+{
+    const char *buf;
+    const char *file = NULL;
+    char devname[128];
+    const char *serial;
+    const char *mediastr = "";
+    BlockInterfaceType type;
+    enum { MEDIA_DISK, MEDIA_CDROM } media;
+    int bus_id, unit_id;
+    int cyls, heads, secs, translation;
+    BlockDriver *drv = NULL;
+    int max_devs;
+    int index;
+    int ro = 0;
+    int bdrv_flags = 0;
+    int on_read_error, on_write_error;
+    const char *devaddr;
+    DriveInfo *dinfo;
+    int snapshot = 0;
+    int ret;
+
+    *fatal_error = 1;
+
+    translation = BIOS_ATA_TRANSLATION_AUTO;
+
+    if (default_to_scsi) {
+        type = IF_SCSI;
+        max_devs = MAX_SCSI_DEVS;
+        pstrcpy(devname, sizeof(devname), "scsi");
+    } else {
+        type = IF_IDE;
+        max_devs = MAX_IDE_DEVS;
+        pstrcpy(devname, sizeof(devname), "ide");
+    }
+    media = MEDIA_DISK;
+
+    /* extract parameters */
+    bus_id  = qemu_opt_get_number(opts, "bus", 0);
+    unit_id = qemu_opt_get_number(opts, "unit", -1);
+    index   = qemu_opt_get_number(opts, "index", -1);
+
+    cyls  = qemu_opt_get_number(opts, "cyls", 0);
+    heads = qemu_opt_get_number(opts, "heads", 0);
+    secs  = qemu_opt_get_number(opts, "secs", 0);
+
+    snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
+    ro = qemu_opt_get_bool(opts, "readonly", 0);
+
+    file = qemu_opt_get(opts, "file");
+    serial = qemu_opt_get(opts, "serial");
+
+    if ((buf = qemu_opt_get(opts, "if")) != NULL) {
+        pstrcpy(devname, sizeof(devname), buf);
+        if (!strcmp(buf, "ide")) {
+	    type = IF_IDE;
+            max_devs = MAX_IDE_DEVS;
+        } else if (!strcmp(buf, "scsi")) {
+	    type = IF_SCSI;
+            max_devs = MAX_SCSI_DEVS;
+        } else if (!strcmp(buf, "floppy")) {
+	    type = IF_FLOPPY;
+            max_devs = 0;
+        } else if (!strcmp(buf, "pflash")) {
+	    type = IF_PFLASH;
+            max_devs = 0;
+	} else if (!strcmp(buf, "mtd")) {
+	    type = IF_MTD;
+            max_devs = 0;
+	} else if (!strcmp(buf, "sd")) {
+	    type = IF_SD;
+            max_devs = 0;
+        } else if (!strcmp(buf, "virtio")) {
+            type = IF_VIRTIO;
+            max_devs = 0;
+	} else if (!strcmp(buf, "xen")) {
+	    type = IF_XEN;
+            max_devs = 0;
+	} else if (!strcmp(buf, "none")) {
+	    type = IF_NONE;
+            max_devs = 0;
+	} else {
+            fprintf(stderr, "qemu: unsupported bus type '%s'\n", buf);
+            return NULL;
+	}
+    }
+
+    if (cyls || heads || secs) {
+        if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
+            fprintf(stderr, "qemu: '%s' invalid physical cyls number\n", buf);
+	    return NULL;
+	}
+        if (heads < 1 || (type == IF_IDE && heads > 16)) {
+            fprintf(stderr, "qemu: '%s' invalid physical heads number\n", buf);
+	    return NULL;
+	}
+        if (secs < 1 || (type == IF_IDE && secs > 63)) {
+            fprintf(stderr, "qemu: '%s' invalid physical secs number\n", buf);
+	    return NULL;
+	}
+    }
+
+    if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
+        if (!cyls) {
+            fprintf(stderr,
+                    "qemu: '%s' trans must be used with cyls,heads and secs\n",
+                    buf);
+            return NULL;
+        }
+        if (!strcmp(buf, "none"))
+            translation = BIOS_ATA_TRANSLATION_NONE;
+        else if (!strcmp(buf, "lba"))
+            translation = BIOS_ATA_TRANSLATION_LBA;
+        else if (!strcmp(buf, "auto"))
+            translation = BIOS_ATA_TRANSLATION_AUTO;
+	else {
+            fprintf(stderr, "qemu: '%s' invalid translation type\n", buf);
+	    return NULL;
+	}
+    }
+
+    if ((buf = qemu_opt_get(opts, "media")) != NULL) {
+        if (!strcmp(buf, "disk")) {
+	    media = MEDIA_DISK;
+	} else if (!strcmp(buf, "cdrom")) {
+            if (cyls || secs || heads) {
+                fprintf(stderr,
+                        "qemu: '%s' invalid physical CHS format\n", buf);
+	        return NULL;
+            }
+	    media = MEDIA_CDROM;
+	} else {
+	    fprintf(stderr, "qemu: '%s' invalid media\n", buf);
+	    return NULL;
+	}
+    }
+
+    if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
+        if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
+            bdrv_flags |= BDRV_O_NOCACHE;
+        } else if (!strcmp(buf, "writeback")) {
+            bdrv_flags |= BDRV_O_CACHE_WB;
+        } else if (!strcmp(buf, "unsafe")) {
+            bdrv_flags |= BDRV_O_CACHE_WB;
+            bdrv_flags |= BDRV_O_NO_FLUSH;
+        } else if (!strcmp(buf, "writethrough")) {
+            /* this is the default */
+        } else {
+           fprintf(stderr, "qemu: invalid cache option\n");
+           return NULL;
+        }
+    }
+
+#ifdef CONFIG_LINUX_AIO
+    if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
+        if (!strcmp(buf, "native")) {
+            bdrv_flags |= BDRV_O_NATIVE_AIO;
+        } else if (!strcmp(buf, "threads")) {
+            /* this is the default */
+        } else {
+           fprintf(stderr, "qemu: invalid aio option\n");
+           return NULL;
+        }
+    }
+#endif
+
+    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
+       if (strcmp(buf, "?") == 0) {
+            fprintf(stderr, "qemu: Supported formats:");
+            bdrv_iterate_format(bdrv_format_print, NULL);
+            fprintf(stderr, "\n");
+	    return NULL;
+        }
+        drv = bdrv_find_whitelisted_format(buf);
+        if (!drv) {
+            fprintf(stderr, "qemu: '%s' invalid format\n", buf);
+            return NULL;
+        }
+    }
+
+    on_write_error = BLOCK_ERR_STOP_ENOSPC;
+    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
+        if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
+            fprintf(stderr, "werror is no supported by this format\n");
+            return NULL;
+        }
+
+        on_write_error = parse_block_error_action(buf, 0);
+        if (on_write_error < 0) {
+            return NULL;
+        }
+    }
+
+    on_read_error = BLOCK_ERR_REPORT;
+    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
+        if (type != IF_IDE && type != IF_VIRTIO && type != IF_NONE) {
+            fprintf(stderr, "rerror is no supported by this format\n");
+            return NULL;
+        }
+
+        on_read_error = parse_block_error_action(buf, 1);
+        if (on_read_error < 0) {
+            return NULL;
+        }
+    }
+
+    if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
+        if (type != IF_VIRTIO) {
+            fprintf(stderr, "addr is not supported\n");
+            return NULL;
+        }
+    }
+
+    /* compute bus and unit according index */
+
+    if (index != -1) {
+        if (bus_id != 0 || unit_id != -1) {
+            fprintf(stderr,
+                    "qemu: index cannot be used with bus and unit\n");
+            return NULL;
+        }
+        if (max_devs == 0)
+        {
+            unit_id = index;
+            bus_id = 0;
+        } else {
+            unit_id = index % max_devs;
+            bus_id = index / max_devs;
+        }
+    }
+
+    /* if user doesn't specify a unit_id,
+     * try to find the first free
+     */
+
+    if (unit_id == -1) {
+       unit_id = 0;
+       while (drive_get(type, bus_id, unit_id) != NULL) {
+           unit_id++;
+           if (max_devs && unit_id >= max_devs) {
+               unit_id -= max_devs;
+               bus_id++;
+           }
+       }
+    }
+
+    /* check unit id */
+
+    if (max_devs && unit_id >= max_devs) {
+        fprintf(stderr, "qemu: unit %d too big (max is %d)\n",
+                unit_id, max_devs - 1);
+        return NULL;
+    }
+
+    /*
+     * ignore multiple definitions
+     */
+
+    if (drive_get(type, bus_id, unit_id) != NULL) {
+        *fatal_error = 0;
+        return NULL;
+    }
+
+    /* init */
+
+    dinfo = qemu_mallocz(sizeof(*dinfo));
+    if ((buf = qemu_opts_id(opts)) != NULL) {
+        dinfo->id = qemu_strdup(buf);
+    } else {
+        /* no id supplied -> create one */
+        dinfo->id = qemu_mallocz(32);
+        if (type == IF_IDE || type == IF_SCSI)
+            mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
+        if (max_devs)
+            snprintf(dinfo->id, 32, "%s%i%s%i",
+                     devname, bus_id, mediastr, unit_id);
+        else
+            snprintf(dinfo->id, 32, "%s%s%i",
+                     devname, mediastr, unit_id);
+    }
+    dinfo->bdrv = bdrv_new(dinfo->id);
+    dinfo->devaddr = devaddr;
+    dinfo->type = type;
+    dinfo->bus = bus_id;
+    dinfo->unit = unit_id;
+    dinfo->opts = opts;
+    if (serial)
+        strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
+    QTAILQ_INSERT_TAIL(&drives, dinfo, next);
+
+    bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
+
+    switch(type) {
+    case IF_IDE:
+    case IF_SCSI:
+    case IF_XEN:
+    case IF_NONE:
+        switch(media) {
+	case MEDIA_DISK:
+            if (cyls != 0) {
+                bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
+                bdrv_set_translation_hint(dinfo->bdrv, translation);
+            }
+	    break;
+	case MEDIA_CDROM:
+            bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
+	    break;
+	}
+        break;
+    case IF_SD:
+        /* FIXME: This isn't really a floppy, but it's a reasonable
+           approximation.  */
+    case IF_FLOPPY:
+        bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
+        break;
+    case IF_PFLASH:
+    case IF_MTD:
+        break;
+    case IF_VIRTIO:
+        /* add virtio block device */
+        opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
+        qemu_opt_set(opts, "driver", "virtio-blk-pci");
+        qemu_opt_set(opts, "drive", dinfo->id);
+        if (devaddr)
+            qemu_opt_set(opts, "addr", devaddr);
+        break;
+    case IF_COUNT:
+        abort();
+    }
+    if (!file || !*file) {
+        *fatal_error = 0;
+        return NULL;
+    }
+    if (snapshot) {
+        /* always use cache=unsafe with snapshot */
+        bdrv_flags &= ~BDRV_O_CACHE_MASK;
+        bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
+    }
+
+    if (media == MEDIA_CDROM) {
+        /* CDROM is fine for any interface, don't check.  */
+        ro = 1;
+    } else if (ro == 1) {
+        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
+            fprintf(stderr, "qemu: readonly flag not supported for drive with this interface\n");
+            return NULL;
+        }
+    }
+
+    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
+
+    ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
+    if (ret < 0) {
+        fprintf(stderr, "qemu: could not open disk image %s: %s\n",
+                        file, strerror(-ret));
+        return NULL;
+    }
+
+    if (bdrv_key_required(dinfo->bdrv))
+        autostart = 0;
+    *fatal_error = 0;
+    return dinfo;
+}
+
+void do_commit(Monitor *mon, const QDict *qdict)
+{
+    const char *device = qdict_get_str(qdict, "device");
+    BlockDriverState *bs;
+
+    if (!strcmp(device, "all")) {
+        bdrv_commit_all();
+    } else {
+        bs = bdrv_find(device);
+        if (!bs) {
+            qerror_report(QERR_DEVICE_NOT_FOUND, device);
+            return;
+        }
+        bdrv_commit(bs);
+    }
+}
+
+static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
+{
+    if (!force) {
+        if (!bdrv_is_removable(bs)) {
+            qerror_report(QERR_DEVICE_NOT_REMOVABLE,
+                           bdrv_get_device_name(bs));
+            return -1;
+        }
+        if (bdrv_is_locked(bs)) {
+            qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
+            return -1;
+        }
+    }
+    bdrv_close(bs);
+    return 0;
+}
+
+int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
+{
+    BlockDriverState *bs;
+    int force = qdict_get_try_bool(qdict, "force", 0);
+    const char *filename = qdict_get_str(qdict, "device");
+
+    bs = bdrv_find(filename);
+    if (!bs) {
+        qerror_report(QERR_DEVICE_NOT_FOUND, filename);
+        return -1;
+    }
+    return eject_device(mon, bs, force);
+}
+
+int do_block_set_passwd(Monitor *mon, const QDict *qdict,
+                        QObject **ret_data)
+{
+    BlockDriverState *bs;
+    int err;
+
+    bs = bdrv_find(qdict_get_str(qdict, "device"));
+    if (!bs) {
+        qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
+        return -1;
+    }
+
+    err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
+    if (err == -EINVAL) {
+        qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
+        return -1;
+    } else if (err < 0) {
+        qerror_report(QERR_INVALID_PASSWORD);
+        return -1;
+    }
+
+    return 0;
+}
+
+int do_change_block(Monitor *mon, const char *device,
+                    const char *filename, const char *fmt)
+{
+    BlockDriverState *bs;
+    BlockDriver *drv = NULL;
+    int bdrv_flags;
+
+    bs = bdrv_find(device);
+    if (!bs) {
+        qerror_report(QERR_DEVICE_NOT_FOUND, device);
+        return -1;
+    }
+    if (fmt) {
+        drv = bdrv_find_whitelisted_format(fmt);
+        if (!drv) {
+            qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
+            return -1;
+        }
+    }
+    if (eject_device(mon, bs, 0) < 0) {
+        return -1;
+    }
+    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
+    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
+    if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
+        qerror_report(QERR_OPEN_FILE_FAILED, filename);
+        return -1;
+    }
+    return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
+}