예제 #1
0
파일: qemu-io.c 프로젝트: AjayMashi/x-tier
static int map_f(int argc, char **argv)
{
    int64_t offset;
    int64_t nb_sectors;
    char s1[64];
    int num, num_checked;
    int ret;
    const char *retstr;

    offset = 0;
    nb_sectors = bs->total_sectors;

    do {
        num_checked = MIN(nb_sectors, INT_MAX);
        ret = bdrv_is_allocated(bs, offset, num_checked, &num);
        retstr = ret ? "    allocated" : "not allocated";
        cvtstr(offset << 9ULL, s1, sizeof(s1));
        printf("[% 24" PRId64 "] % 8d/% 8d sectors %s at offset %s (%d)\n",
               offset << 9ULL, num, num_checked, retstr, s1, ret);

        offset += num;
        nb_sectors -= num;
    } while (offset < bs->total_sectors);

    return 0;
}
예제 #2
0
static void test_sync_op_block_status(BdrvChild *c)
{
    int ret;
    int64_t n;

    /* Normal success path */
    ret = bdrv_is_allocated(c->bs, 0, 65536, &n);
    g_assert_cmpint(ret, ==, 0);

    /* Early success: No driver support */
    bdrv_test.bdrv_co_block_status = NULL;
    ret = bdrv_is_allocated(c->bs, 0, 65536, &n);
    g_assert_cmpint(ret, ==, 1);

    /* Early success: bytes = 0 */
    ret = bdrv_is_allocated(c->bs, 0, 0, &n);
    g_assert_cmpint(ret, ==, 0);

    /* Early success: Offset > image size*/
    ret = bdrv_is_allocated(c->bs, 0x1000000, 0x1000000, &n);
    g_assert_cmpint(ret, ==, 0);
}
예제 #3
0
static int alloc_f(int argc, char **argv)
{
    int64_t offset, sector_num;
    int nb_sectors, remaining;
    char s1[64];
    int num, sum_alloc;
    int ret;

    offset = cvtnum(argv[1]);
    if (offset & 0x1ff) {
        printf("offset %" PRId64 " is not sector aligned\n",
               offset);
        return 0;
    }

    if (argc == 3) {
        nb_sectors = cvtnum(argv[2]);
    } else {
        nb_sectors = 1;
    }

    remaining = nb_sectors;
    sum_alloc = 0;
    sector_num = offset >> 9;
    while (remaining) {
        ret = bdrv_is_allocated(bs, sector_num, remaining, &num);
        if (ret < 0) {
            printf("is_allocated failed: %s\n", strerror(-ret));
            return 0;
        }
        sector_num += num;
        remaining -= num;
        if (ret) {
            sum_alloc += num;
        }
        if (num == 0) {
            nb_sectors -= remaining;
            remaining = 0;
        }
    }

    cvtstr(offset, s1, sizeof(s1));

    if (nb_sectors == 1)
        printf("sector allocated at offset %s\n", s1);
    else
        printf("%d/%d sectors allocated at offset %s\n",
               sum_alloc, nb_sectors, s1);
    return 0;
}
예제 #4
0
파일: stream.c 프로젝트: OSLL/qemu-xtensa
static int coroutine_fn stream_run(Job *job, Error **errp)
{
    StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
    BlockBackend *blk = s->common.blk;
    BlockDriverState *bs = blk_bs(blk);
    BlockDriverState *base = s->base;
    int64_t len;
    int64_t offset = 0;
    uint64_t delay_ns = 0;
    int error = 0;
    int ret = 0;
    int64_t n = 0; /* bytes */
    void *buf;

    if (!bs->backing) {
        goto out;
    }

    len = bdrv_getlength(bs);
    if (len < 0) {
        ret = len;
        goto out;
    }
    job_progress_set_remaining(&s->common.job, len);

    buf = qemu_blockalign(bs, STREAM_BUFFER_SIZE);

    /* Turn on copy-on-read for the whole block device so that guest read
     * requests help us make progress.  Only do this when copying the entire
     * backing chain since the copy-on-read operation does not take base into
     * account.
     */
    if (!base) {
        bdrv_enable_copy_on_read(bs);
    }

    for ( ; offset < len; offset += n) {
        bool copy;

        /* Note that even when no rate limit is applied we need to yield
         * with no pending I/O here so that bdrv_drain_all() returns.
         */
        job_sleep_ns(&s->common.job, delay_ns);
        if (job_is_cancelled(&s->common.job)) {
            break;
        }

        copy = false;

        ret = bdrv_is_allocated(bs, offset, STREAM_BUFFER_SIZE, &n);
        if (ret == 1) {
            /* Allocated in the top, no need to copy.  */
        } else if (ret >= 0) {
            /* Copy if allocated in the intermediate images.  Limit to the
             * known-unallocated area [offset, offset+n*BDRV_SECTOR_SIZE).  */
            ret = bdrv_is_allocated_above(backing_bs(bs), base,
                                          offset, n, &n);

            /* Finish early if end of backing file has been reached */
            if (ret == 0 && n == 0) {
                n = len - offset;
            }

            copy = (ret == 1);
        }
        trace_stream_one_iteration(s, offset, n, ret);
        if (copy) {
            ret = stream_populate(blk, offset, n, buf);
        }
        if (ret < 0) {
            BlockErrorAction action =
                block_job_error_action(&s->common, s->on_error, true, -ret);
            if (action == BLOCK_ERROR_ACTION_STOP) {
                n = 0;
                continue;
            }
            if (error == 0) {
                error = ret;
            }
            if (action == BLOCK_ERROR_ACTION_REPORT) {
                break;
            }
        }
        ret = 0;

        /* Publish progress */
        job_progress_update(&s->common.job, n);
        if (copy) {
            delay_ns = block_job_ratelimit_get_delay(&s->common, n);
        } else {
            delay_ns = 0;
        }
    }

    if (!base) {
        bdrv_disable_copy_on_read(bs);
    }

    /* Do not remove the backing file if an error was there but ignored.  */
    ret = error;

    qemu_vfree(buf);

out:
    /* Modify backing chain and close BDSes in main loop */
    return ret;
}
예제 #5
0
파일: commit.c 프로젝트: MaddTheSane/qemu
/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
    BlockBackend *src, *backing;
    BlockDriverState *backing_file_bs = NULL;
    BlockDriverState *commit_top_bs = NULL;
    BlockDriver *drv = bs->drv;
    int64_t offset, length, backing_length;
    int ro;
    int64_t n;
    int ret = 0;
    uint8_t *buf = NULL;
    Error *local_err = NULL;

    if (!drv)
        return -ENOMEDIUM;

    if (!bs->backing) {
        return -ENOTSUP;
    }

    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) ||
        bdrv_op_is_blocked(bs->backing->bs, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) {
        return -EBUSY;
    }

    ro = bs->backing->bs->read_only;

    if (ro) {
        if (bdrv_reopen_set_read_only(bs->backing->bs, false, NULL)) {
            return -EACCES;
        }
    }

    src = blk_new(BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL);
    backing = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);

    ret = blk_insert_bs(src, bs, &local_err);
    if (ret < 0) {
        error_report_err(local_err);
        goto ro_cleanup;
    }

    /* Insert commit_top block node above backing, so we can write to it */
    backing_file_bs = backing_bs(bs);

    commit_top_bs = bdrv_new_open_driver(&bdrv_commit_top, NULL, BDRV_O_RDWR,
                                         &local_err);
    if (commit_top_bs == NULL) {
        error_report_err(local_err);
        goto ro_cleanup;
    }
    bdrv_set_aio_context(commit_top_bs, bdrv_get_aio_context(backing_file_bs));

    bdrv_set_backing_hd(commit_top_bs, backing_file_bs, &error_abort);
    bdrv_set_backing_hd(bs, commit_top_bs, &error_abort);

    ret = blk_insert_bs(backing, backing_file_bs, &local_err);
    if (ret < 0) {
        error_report_err(local_err);
        goto ro_cleanup;
    }

    length = blk_getlength(src);
    if (length < 0) {
        ret = length;
        goto ro_cleanup;
    }

    backing_length = blk_getlength(backing);
    if (backing_length < 0) {
        ret = backing_length;
        goto ro_cleanup;
    }

    /* If our top snapshot is larger than the backing file image,
     * grow the backing file image if possible.  If not possible,
     * we must return an error */
    if (length > backing_length) {
        ret = blk_truncate(backing, length, PREALLOC_MODE_OFF, &local_err);
        if (ret < 0) {
            error_report_err(local_err);
            goto ro_cleanup;
        }
    }

    /* blk_try_blockalign() for src will choose an alignment that works for
     * backing as well, so no need to compare the alignment manually. */
    buf = blk_try_blockalign(src, COMMIT_BUF_SIZE);
    if (buf == NULL) {
        ret = -ENOMEM;
        goto ro_cleanup;
    }

    for (offset = 0; offset < length; offset += n) {
        ret = bdrv_is_allocated(bs, offset, COMMIT_BUF_SIZE, &n);
        if (ret < 0) {
            goto ro_cleanup;
        }
        if (ret) {
            ret = blk_pread(src, offset, buf, n);
            if (ret < 0) {
                goto ro_cleanup;
            }

            ret = blk_pwrite(backing, offset, buf, n, 0);
            if (ret < 0) {
                goto ro_cleanup;
            }
        }
    }

    if (drv->bdrv_make_empty) {
        ret = drv->bdrv_make_empty(bs);
        if (ret < 0) {
            goto ro_cleanup;
        }
        blk_flush(src);
    }

    /*
     * Make sure all data we wrote to the backing device is actually
     * stable on disk.
     */
    blk_flush(backing);

    ret = 0;
ro_cleanup:
    qemu_vfree(buf);

    blk_unref(backing);
    if (backing_file_bs) {
        bdrv_set_backing_hd(bs, backing_file_bs, &error_abort);
    }
    bdrv_unref(commit_top_bs);
    blk_unref(src);

    if (ro) {
        /* ignoring error return here */
        bdrv_reopen_set_read_only(bs->backing->bs, true, NULL);
    }

    return ret;
}