Move block drivers into their own directory

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 0 insertions, 606 deletions

diff --git a/block-vpc.c b/block-vpc.c
deleted file mode 100644
index 211ae5c..0000000
--- a/block-vpc.c
+++ /dev/null
@@ -1,606 +0,0 @@
-/*
- * Block driver for Conectix/Microsoft Virtual PC images
- *
- * Copyright (c) 2005 Alex Beregszaszi
- * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de>
- *
- * 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 "qemu-common.h"
-#include "block_int.h"
-#include "module.h"
-
-/**************************************************************/
-
-#define HEADER_SIZE 512
-
-//#define CACHE
-
-enum vhd_type {
-    VHD_FIXED           = 2,
-    VHD_DYNAMIC         = 3,
-    VHD_DIFFERENCING    = 4,
-};
-
-// Seconds since Jan 1, 2000 0:00:00 (UTC)
-#define VHD_TIMESTAMP_BASE 946684800
-
-// always big-endian
-struct vhd_footer {
-    char        creator[8]; // "conectix"
-    uint32_t    features;
-    uint32_t    version;
-
-    // Offset of next header structure, 0xFFFFFFFF if none
-    uint64_t    data_offset;
-
-    // Seconds since Jan 1, 2000 0:00:00 (UTC)
-    uint32_t    timestamp;
-
-    char        creator_app[4]; // "vpc "
-    uint16_t    major;
-    uint16_t    minor;
-    char        creator_os[4]; // "Wi2k"
-
-    uint64_t    orig_size;
-    uint64_t    size;
-
-    uint16_t    cyls;
-    uint8_t     heads;
-    uint8_t     secs_per_cyl;
-
-    uint32_t    type;
-
-    // Checksum of the Hard Disk Footer ("one's complement of the sum of all
-    // the bytes in the footer without the checksum field")
-    uint32_t    checksum;
-
-    // UUID used to identify a parent hard disk (backing file)
-    uint8_t     uuid[16];
-
-    uint8_t     in_saved_state;
-};
-
-struct vhd_dyndisk_header {
-    char        magic[8]; // "cxsparse"
-
-    // Offset of next header structure, 0xFFFFFFFF if none
-    uint64_t    data_offset;
-
-    // Offset of the Block Allocation Table (BAT)
-    uint64_t    table_offset;
-
-    uint32_t    version;
-    uint32_t    max_table_entries; // 32bit/entry
-
-    // 2 MB by default, must be a power of two
-    uint32_t    block_size;
-
-    uint32_t    checksum;
-    uint8_t     parent_uuid[16];
-    uint32_t    parent_timestamp;
-    uint32_t    reserved;
-
-    // Backing file name (in UTF-16)
-    uint8_t     parent_name[512];
-
-    struct {
-        uint32_t    platform;
-        uint32_t    data_space;
-        uint32_t    data_length;
-        uint32_t    reserved;
-        uint64_t    data_offset;
-    } parent_locator[8];
-};
-
-typedef struct BDRVVPCState {
-    BlockDriverState *hd;
-
-    uint8_t footer_buf[HEADER_SIZE];
-    uint64_t free_data_block_offset;
-    int max_table_entries;
-    uint32_t *pagetable;
-    uint64_t bat_offset;
-    uint64_t last_bitmap_offset;
-
-    uint32_t block_size;
-    uint32_t bitmap_size;
-
-#ifdef CACHE
-    uint8_t *pageentry_u8;
-    uint32_t *pageentry_u32;
-    uint16_t *pageentry_u16;
-
-    uint64_t last_bitmap;
-#endif
-} BDRVVPCState;
-
-static uint32_t vpc_checksum(uint8_t* buf, size_t size)
-{
-    uint32_t res = 0;
-    int i;
-
-    for (i = 0; i < size; i++)
-        res += buf[i];
-
-    return ~res;
-}
-
-
-static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
-{
-    if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8))
-	return 100;
-    return 0;
-}
-
-static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
-{
-    BDRVVPCState *s = bs->opaque;
-    int ret, i;
-    struct vhd_footer* footer;
-    struct vhd_dyndisk_header* dyndisk_header;
-    uint8_t buf[HEADER_SIZE];
-    uint32_t checksum;
-
-    ret = bdrv_file_open(&s->hd, filename, flags);
-    if (ret < 0)
-        return ret;
-
-    if (bdrv_pread(s->hd, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
-        goto fail;
-
-    footer = (struct vhd_footer*) s->footer_buf;
-    if (strncmp(footer->creator, "conectix", 8))
-        goto fail;
-
-    checksum = be32_to_cpu(footer->checksum);
-    footer->checksum = 0;
-    if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
-        fprintf(stderr, "block-vpc: The header checksum of '%s' is "
-            "incorrect.\n", filename);
-
-    // The visible size of a image in Virtual PC depends on the geometry
-    // rather than on the size stored in the footer (the size in the footer
-    // is too large usually)
-    bs->total_sectors = (int64_t)
-        be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
-
-    if (bdrv_pread(s->hd, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
-            != HEADER_SIZE)
-        goto fail;
-
-    dyndisk_header = (struct vhd_dyndisk_header*) buf;
-
-    if (strncmp(dyndisk_header->magic, "cxsparse", 8))
-        goto fail;
-
-
-    s->block_size = be32_to_cpu(dyndisk_header->block_size);
-    s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
-
-    s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
-    s->pagetable = qemu_malloc(s->max_table_entries * 4);
-
-    s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
-    if (bdrv_pread(s->hd, s->bat_offset, s->pagetable,
-            s->max_table_entries * 4) != s->max_table_entries * 4)
-	    goto fail;
-
-    s->free_data_block_offset =
-        (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511;
-
-    for (i = 0; i < s->max_table_entries; i++) {
-        be32_to_cpus(&s->pagetable[i]);
-        if (s->pagetable[i] != 0xFFFFFFFF) {
-            int64_t next = (512 * (int64_t) s->pagetable[i]) +
-                s->bitmap_size + s->block_size;
-
-            if (next> s->free_data_block_offset)
-                s->free_data_block_offset = next;
-        }
-    }
-
-    s->last_bitmap_offset = (int64_t) -1;
-
-#ifdef CACHE
-    s->pageentry_u8 = qemu_malloc(512);
-    s->pageentry_u32 = s->pageentry_u8;
-    s->pageentry_u16 = s->pageentry_u8;
-    s->last_pagetable = -1;
-#endif
-
-    return 0;
- fail:
-    bdrv_delete(s->hd);
-    return -1;
-}
-
-/*
- * Returns the absolute byte offset of the given sector in the image file.
- * If the sector is not allocated, -1 is returned instead.
- *
- * The parameter write must be 1 if the offset will be used for a write
- * operation (the block bitmaps is updated then), 0 otherwise.
- */
-static inline int64_t get_sector_offset(BlockDriverState *bs,
-    int64_t sector_num, int write)
-{
-    BDRVVPCState *s = bs->opaque;
-    uint64_t offset = sector_num * 512;
-    uint64_t bitmap_offset, block_offset;
-    uint32_t pagetable_index, pageentry_index;
-
-    pagetable_index = offset / s->block_size;
-    pageentry_index = (offset % s->block_size) / 512;
-
-    if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff)
-        return -1; // not allocated
-
-    bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
-    block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
-
-    // We must ensure that we don't write to any sectors which are marked as
-    // unused in the bitmap. We get away with setting all bits in the block
-    // bitmap each time we write to a new block. This might cause Virtual PC to
-    // miss sparse read optimization, but it's not a problem in terms of
-    // correctness.
-    if (write && (s->last_bitmap_offset != bitmap_offset)) {
-        uint8_t bitmap[s->bitmap_size];
-
-        s->last_bitmap_offset = bitmap_offset;
-        memset(bitmap, 0xff, s->bitmap_size);
-        bdrv_pwrite(s->hd, bitmap_offset, bitmap, s->bitmap_size);
-    }
-
-//    printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
-//	sector_num, pagetable_index, pageentry_index,
-//	bitmap_offset, block_offset);
-
-// disabled by reason
-#if 0
-#ifdef CACHE
-    if (bitmap_offset != s->last_bitmap)
-    {
-	lseek(s->fd, bitmap_offset, SEEK_SET);
-
-	s->last_bitmap = bitmap_offset;
-
-	// Scary! Bitmap is stored as big endian 32bit entries,
-	// while we used to look it up byte by byte
-	read(s->fd, s->pageentry_u8, 512);
-	for (i = 0; i < 128; i++)
-	    be32_to_cpus(&s->pageentry_u32[i]);
-    }
-
-    if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
-	return -1;
-#else
-    lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
-
-    read(s->fd, &bitmap_entry, 1);
-
-    if ((bitmap_entry >> (pageentry_index % 8)) & 1)
-	return -1; // not allocated
-#endif
-#endif
-
-    return block_offset;
-}
-
-/*
- * Writes the footer to the end of the image file. This is needed when the
- * file grows as it overwrites the old footer
- *
- * Returns 0 on success and < 0 on error
- */
-static int rewrite_footer(BlockDriverState* bs)
-{
-    int ret;
-    BDRVVPCState *s = bs->opaque;
-    int64_t offset = s->free_data_block_offset;
-
-    ret = bdrv_pwrite(s->hd, offset, s->footer_buf, HEADER_SIZE);
-    if (ret < 0)
-        return ret;
-
-    return 0;
-}
-
-/*
- * Allocates a new block. This involves writing a new footer and updating
- * the Block Allocation Table to use the space at the old end of the image
- * file (overwriting the old footer)
- *
- * Returns the sectors' offset in the image file on success and < 0 on error
- */
-static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
-{
-    BDRVVPCState *s = bs->opaque;
-    int64_t bat_offset;
-    uint32_t index, bat_value;
-    int ret;
-    uint8_t bitmap[s->bitmap_size];
-
-    // Check if sector_num is valid
-    if ((sector_num < 0) || (sector_num > bs->total_sectors))
-        return -1;
-
-    // Write entry into in-memory BAT
-    index = (sector_num * 512) / s->block_size;
-    if (s->pagetable[index] != 0xFFFFFFFF)
-        return -1;
-
-    s->pagetable[index] = s->free_data_block_offset / 512;
-
-    // Initialize the block's bitmap
-    memset(bitmap, 0xff, s->bitmap_size);
-    bdrv_pwrite(s->hd, s->free_data_block_offset, bitmap, s->bitmap_size);
-
-    // Write new footer (the old one will be overwritten)
-    s->free_data_block_offset += s->block_size + s->bitmap_size;
-    ret = rewrite_footer(bs);
-    if (ret < 0)
-        goto fail;
-
-    // Write BAT entry to disk
-    bat_offset = s->bat_offset + (4 * index);
-    bat_value = be32_to_cpu(s->pagetable[index]);
-    ret = bdrv_pwrite(s->hd, bat_offset, &bat_value, 4);
-    if (ret < 0)
-        goto fail;
-
-    return get_sector_offset(bs, sector_num, 0);
-
-fail:
-    s->free_data_block_offset -= (s->block_size + s->bitmap_size);
-    return -1;
-}
-
-static int vpc_read(BlockDriverState *bs, int64_t sector_num,
-                    uint8_t *buf, int nb_sectors)
-{
-    BDRVVPCState *s = bs->opaque;
-    int ret;
-    int64_t offset;
-
-    while (nb_sectors > 0) {
-        offset = get_sector_offset(bs, sector_num, 0);
-
-        if (offset == -1) {
-            memset(buf, 0, 512);
-        } else {
-            ret = bdrv_pread(s->hd, offset, buf, 512);
-            if (ret != 512)
-                return -1;
-        }
-
-        nb_sectors--;
-        sector_num++;
-        buf += 512;
-    }
-    return 0;
-}
-
-static int vpc_write(BlockDriverState *bs, int64_t sector_num,
-    const uint8_t *buf, int nb_sectors)
-{
-    BDRVVPCState *s = bs->opaque;
-    int64_t offset;
-    int ret;
-
-    while (nb_sectors > 0) {
-        offset = get_sector_offset(bs, sector_num, 1);
-
-        if (offset == -1) {
-            offset = alloc_block(bs, sector_num);
-            if (offset < 0)
-                return -1;
-        }
-
-        ret = bdrv_pwrite(s->hd, offset, buf, 512);
-        if (ret != 512)
-            return -1;
-
-        nb_sectors--;
-        sector_num++;
-        buf += 512;
-    }
-
-    return 0;
-}
-
-
-/*
- * Calculates the number of cylinders, heads and sectors per cylinder
- * based on a given number of sectors. This is the algorithm described
- * in the VHD specification.
- *
- * Note that the geometry doesn't always exactly match total_sectors but
- * may round it down.
- *
- * Returns 0 on success, -EFBIG if the size is larger than 127 GB
- */
-static int calculate_geometry(int64_t total_sectors, uint16_t* cyls,
-    uint8_t* heads, uint8_t* secs_per_cyl)
-{
-    uint32_t cyls_times_heads;
-
-    if (total_sectors > 65535 * 16 * 255)
-        return -EFBIG;
-
-    if (total_sectors > 65535 * 16 * 63) {
-        *secs_per_cyl = 255;
-        *heads = 16;
-        cyls_times_heads = total_sectors / *secs_per_cyl;
-    } else {
-        *secs_per_cyl = 17;
-        cyls_times_heads = total_sectors / *secs_per_cyl;
-        *heads = (cyls_times_heads + 1023) / 1024;
-
-        if (*heads < 4)
-            *heads = 4;
-
-        if (cyls_times_heads >= (*heads * 1024) || *heads > 16) {
-            *secs_per_cyl = 31;
-            *heads = 16;
-            cyls_times_heads = total_sectors / *secs_per_cyl;
-        }
-
-        if (cyls_times_heads >= (*heads * 1024)) {
-            *secs_per_cyl = 63;
-            *heads = 16;
-            cyls_times_heads = total_sectors / *secs_per_cyl;
-        }
-    }
-
-    // Note: Rounding up deviates from the Virtual PC behaviour
-    // However, we need this to avoid truncating images in qemu-img convert
-    *cyls = (cyls_times_heads + *heads - 1) / *heads;
-
-    return 0;
-}
-
-static int vpc_create(const char *filename, int64_t total_sectors,
-    const char *backing_file, int flags)
-{
-    uint8_t buf[1024];
-    struct vhd_footer* footer = (struct vhd_footer*) buf;
-    struct vhd_dyndisk_header* dyndisk_header =
-        (struct vhd_dyndisk_header*) buf;
-    int fd, i;
-    uint16_t cyls;
-    uint8_t heads;
-    uint8_t secs_per_cyl;
-    size_t block_size, num_bat_entries;
-
-    if (backing_file != NULL)
-        return -ENOTSUP;
-
-    fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
-    if (fd < 0)
-        return -EIO;
-
-    // Calculate matching total_size and geometry
-    if (calculate_geometry(total_sectors, &cyls, &heads, &secs_per_cyl))
-        return -EFBIG;
-    total_sectors = (int64_t) cyls * heads * secs_per_cyl;
-
-    // Prepare the Hard Disk Footer
-    memset(buf, 0, 1024);
-
-    strncpy(footer->creator, "conectix", 8);
-    // TODO Check if "qemu" creator_app is ok for VPC
-    strncpy(footer->creator_app, "qemu", 4);
-    strncpy(footer->creator_os, "Wi2k", 4);
-
-    footer->features = be32_to_cpu(0x02);
-    footer->version = be32_to_cpu(0x00010000);
-    footer->data_offset = be64_to_cpu(HEADER_SIZE);
-    footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
-
-    // Version of Virtual PC 2007
-    footer->major = be16_to_cpu(0x0005);
-    footer->minor =be16_to_cpu(0x0003);
-
-    footer->orig_size = be64_to_cpu(total_sectors * 512);
-    footer->size = be64_to_cpu(total_sectors * 512);
-
-    footer->cyls = be16_to_cpu(cyls);
-    footer->heads = heads;
-    footer->secs_per_cyl = secs_per_cyl;
-
-    footer->type = be32_to_cpu(VHD_DYNAMIC);
-
-    // TODO uuid is missing
-
-    footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
-
-    // Write the footer (twice: at the beginning and at the end)
-    block_size = 0x200000;
-    num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
-
-    if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE)
-        return -EIO;
-
-    if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0)
-        return -EIO;
-    if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE)
-        return -EIO;
-
-    // Write the initial BAT
-    if (lseek(fd, 3 * 512, SEEK_SET) < 0)
-        return -EIO;
-
-    memset(buf, 0xFF, 512);
-    for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++)
-        if (write(fd, buf, 512) != 512)
-            return -EIO;
-
-
-    // Prepare the Dynamic Disk Header
-    memset(buf, 0, 1024);
-
-    strncpy(dyndisk_header->magic, "cxsparse", 8);
-
-    dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF);
-    dyndisk_header->table_offset = be64_to_cpu(3 * 512);
-    dyndisk_header->version = be32_to_cpu(0x00010000);
-    dyndisk_header->block_size = be32_to_cpu(block_size);
-    dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries);
-
-    dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
-
-    // Write the header
-    if (lseek(fd, 512, SEEK_SET) < 0)
-        return -EIO;
-    if (write(fd, buf, 1024) != 1024)
-        return -EIO;
-
-    close(fd);
-    return 0;
-}
-
-static void vpc_close(BlockDriverState *bs)
-{
-    BDRVVPCState *s = bs->opaque;
-    qemu_free(s->pagetable);
-#ifdef CACHE
-    qemu_free(s->pageentry_u8);
-#endif
-    bdrv_delete(s->hd);
-}
-
-static BlockDriver bdrv_vpc = {
-    .format_name	= "vpc",
-    .instance_size	= sizeof(BDRVVPCState),
-    .bdrv_probe		= vpc_probe,
-    .bdrv_open		= vpc_open,
-    .bdrv_read		= vpc_read,
-    .bdrv_write		= vpc_write,
-    .bdrv_close		= vpc_close,
-    .bdrv_create	= vpc_create,
-};
-
-static void bdrv_vpc_init(void)
-{
-    bdrv_register(&bdrv_vpc);
-}
-
-block_init(bdrv_vpc_init);