* THE SOFTWARE.
*/
#include "vl.h"
+#include "block_int.h"
-#ifndef _WIN32
-#include <sys/mman.h>
+#ifdef _BSD
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/queue.h>
+#include <sys/disk.h>
#endif
-#include "cow.h"
-
-struct BlockDriverState {
- int fd; /* if -1, only COW mappings */
- int64_t total_sectors;
- int read_only; /* if true, the media is read only */
- int inserted; /* if true, the media is present */
- int removable; /* if true, the media can be removed */
- int locked; /* if true, the media cannot temporarily be ejected */
- /* event callback when inserting/removing */
- void (*change_cb)(void *opaque);
- void *change_opaque;
-
- uint8_t *cow_bitmap; /* if non NULL, COW mappings are used first */
- uint8_t *cow_bitmap_addr; /* mmap address of cow_bitmap */
- int cow_bitmap_size;
- int cow_fd;
- int64_t cow_sectors_offset;
- int boot_sector_enabled;
- uint8_t boot_sector_data[512];
-
- char filename[1024];
-
- /* NOTE: the following infos are only hints for real hardware
- drivers. They are not used by the block driver */
- int cyls, heads, secs;
- int type;
- char device_name[32];
- BlockDriverState *next;
-};
+#define SECTOR_BITS 9
+#define SECTOR_SIZE (1 << SECTOR_BITS)
+
+typedef struct BlockDriverAIOCBSync {
+ BlockDriverAIOCB common;
+ QEMUBH *bh;
+ int ret;
+} BlockDriverAIOCBSync;
+
+static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
+ int64_t sector_num, uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque);
+static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
+ int64_t sector_num, const uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque);
+static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
+static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors);
+static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors);
static BlockDriverState *bdrv_first;
+static BlockDriver *first_drv;
+
+#ifdef _WIN32
+#define PATH_SEP '\\'
+#else
+#define PATH_SEP '/'
+#endif
+
+int path_is_absolute(const char *path)
+{
+ const char *p;
+ p = strchr(path, ':');
+ if (p)
+ p++;
+ else
+ p = path;
+ return (*p == PATH_SEP);
+}
+
+/* if filename is absolute, just copy it to dest. Otherwise, build a
+ path to it by considering it is relative to base_path. URL are
+ supported. */
+void path_combine(char *dest, int dest_size,
+ const char *base_path,
+ const char *filename)
+{
+ const char *p, *p1;
+ int len;
+
+ if (dest_size <= 0)
+ return;
+ if (path_is_absolute(filename)) {
+ pstrcpy(dest, dest_size, filename);
+ } else {
+ p = strchr(base_path, ':');
+ if (p)
+ p++;
+ else
+ p = base_path;
+ p1 = strrchr(base_path, PATH_SEP);
+ if (p1)
+ p1++;
+ else
+ p1 = base_path;
+ if (p1 > p)
+ p = p1;
+ len = p - base_path;
+ if (len > dest_size - 1)
+ len = dest_size - 1;
+ memcpy(dest, base_path, len);
+ dest[len] = '\0';
+ pstrcat(dest, dest_size, filename);
+ }
+}
+
+
+void bdrv_register(BlockDriver *bdrv)
+{
+ if (!bdrv->bdrv_aio_read) {
+ /* add AIO emulation layer */
+ bdrv->bdrv_aio_read = bdrv_aio_read_em;
+ bdrv->bdrv_aio_write = bdrv_aio_write_em;
+ bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
+ bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
+ } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
+ /* add synchronous IO emulation layer */
+ bdrv->bdrv_read = bdrv_read_em;
+ bdrv->bdrv_write = bdrv_write_em;
+ }
+ bdrv->next = first_drv;
+ first_drv = bdrv;
+}
/* create a new block device (by default it is empty) */
BlockDriverState *bdrv_new(const char *device_name)
if(!bs)
return NULL;
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
- /* insert at the end */
- pbs = &bdrv_first;
- while (*pbs != NULL)
- pbs = &(*pbs)->next;
- *pbs = bs;
+ if (device_name[0] != '\0') {
+ /* insert at the end */
+ pbs = &bdrv_first;
+ while (*pbs != NULL)
+ pbs = &(*pbs)->next;
+ *pbs = bs;
+ }
return bs;
}
-int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
+BlockDriver *bdrv_find_format(const char *format_name)
+{
+ BlockDriver *drv1;
+ for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
+ if (!strcmp(drv1->format_name, format_name))
+ return drv1;
+ }
+ return NULL;
+}
+
+int bdrv_create(BlockDriver *drv,
+ const char *filename, int64_t size_in_sectors,
+ const char *backing_file, int flags)
+{
+ if (!drv->bdrv_create)
+ return -ENOTSUP;
+ return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
+}
+
+#ifdef _WIN32
+void get_tmp_filename(char *filename, int size)
+{
+ tmpnam(filename);
+}
+#else
+void get_tmp_filename(char *filename, int size)
{
int fd;
- int64_t size;
- struct cow_header_v2 cow_header;
-#ifndef _WIN32
- char template[] = "/tmp/vl.XXXXXX";
- int cow_fd;
- struct stat st;
+ /* XXX: race condition possible */
+ pstrcpy(filename, size, "/tmp/vl.XXXXXX");
+ fd = mkstemp(filename);
+ close(fd);
+}
#endif
- bs->read_only = 0;
- bs->fd = -1;
- bs->cow_fd = -1;
- bs->cow_bitmap = NULL;
- pstrcpy(bs->filename, sizeof(bs->filename), filename);
+#ifdef _WIN32
+static int is_windows_drive_prefix(const char *filename)
+{
+ return (((filename[0] >= 'a' && filename[0] <= 'z') ||
+ (filename[0] >= 'A' && filename[0] <= 'Z')) &&
+ filename[1] == ':');
+}
+
+static int is_windows_drive(const char *filename)
+{
+ if (is_windows_drive_prefix(filename) &&
+ filename[2] == '\0')
+ return 1;
+ if (strstart(filename, "\\\\.\\", NULL) ||
+ strstart(filename, "//./", NULL))
+ return 1;
+ return 0;
+}
+#endif
+
+static BlockDriver *find_protocol(const char *filename)
+{
+ BlockDriver *drv1;
+ char protocol[128];
+ int len;
+ const char *p;
- /* open standard HD image */
#ifdef _WIN32
- fd = open(filename, O_RDWR | O_BINARY);
-#else
- fd = open(filename, O_RDWR | O_LARGEFILE);
+ if (is_windows_drive(filename) ||
+ is_windows_drive_prefix(filename))
+ return &bdrv_raw;
#endif
- if (fd < 0) {
- /* read only image on disk */
+ p = strchr(filename, ':');
+ if (!p)
+ return &bdrv_raw;
+ len = p - filename;
+ if (len > sizeof(protocol) - 1)
+ len = sizeof(protocol) - 1;
+ memcpy(protocol, filename, len);
+ protocol[len] = '\0';
+ for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
+ if (drv1->protocol_name &&
+ !strcmp(drv1->protocol_name, protocol))
+ return drv1;
+ }
+ return NULL;
+}
+
+/* XXX: force raw format if block or character device ? It would
+ simplify the BSD case */
+static BlockDriver *find_image_format(const char *filename)
+{
+ int ret, score, score_max;
+ BlockDriver *drv1, *drv;
+ uint8_t buf[2048];
+ BlockDriverState *bs;
+
+ /* detect host devices. By convention, /dev/cdrom[N] is always
+ recognized as a host CDROM */
+ if (strstart(filename, "/dev/cdrom", NULL))
+ return &bdrv_host_device;
#ifdef _WIN32
- fd = open(filename, O_RDONLY | O_BINARY);
+ if (is_windows_drive(filename))
+ return &bdrv_host_device;
#else
- fd = open(filename, O_RDONLY | O_LARGEFILE);
-#endif
- if (fd < 0) {
- perror(filename);
- goto fail;
+ {
+ struct stat st;
+ if (stat(filename, &st) >= 0 &&
+ (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
+ return &bdrv_host_device;
}
- if (!snapshot)
- bs->read_only = 1;
}
- bs->fd = fd;
+#endif
+
+ drv = find_protocol(filename);
+ /* no need to test disk image formats for vvfat */
+ if (drv == &bdrv_vvfat)
+ return drv;
- /* see if it is a cow image */
- if (read(fd, &cow_header, sizeof(cow_header)) != sizeof(cow_header)) {
- fprintf(stderr, "%s: could not read header\n", filename);
- goto fail;
+ ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
+ if (ret < 0)
+ return NULL;
+ ret = bdrv_pread(bs, 0, buf, sizeof(buf));
+ bdrv_delete(bs);
+ if (ret < 0) {
+ return NULL;
}
-#ifndef _WIN32
- if (be32_to_cpu(cow_header.magic) == COW_MAGIC &&
- be32_to_cpu(cow_header.version) == COW_VERSION) {
- /* cow image found */
- size = cow_header.size;
-#ifndef WORDS_BIGENDIAN
- size = bswap64(size);
-#endif
- bs->total_sectors = size / 512;
-
- bs->cow_fd = fd;
- bs->fd = -1;
- if (cow_header.backing_file[0] != '\0') {
- if (stat(cow_header.backing_file, &st) != 0) {
- fprintf(stderr, "%s: could not find original disk image '%s'\n", filename, cow_header.backing_file);
- goto fail;
- }
- if (st.st_mtime != be32_to_cpu(cow_header.mtime)) {
- fprintf(stderr, "%s: original raw disk image '%s' does not match saved timestamp\n", filename, cow_header.backing_file);
- goto fail;
+
+ score_max = 0;
+ for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
+ if (drv1->bdrv_probe) {
+ score = drv1->bdrv_probe(buf, ret, filename);
+ if (score > score_max) {
+ score_max = score;
+ drv = drv1;
}
- fd = open(cow_header.backing_file, O_RDONLY | O_LARGEFILE);
- if (fd < 0)
- goto fail;
- bs->fd = fd;
}
- /* mmap the bitmap */
- bs->cow_bitmap_size = ((bs->total_sectors + 7) >> 3) + sizeof(cow_header);
- bs->cow_bitmap_addr = mmap(get_mmap_addr(bs->cow_bitmap_size),
- bs->cow_bitmap_size,
- PROT_READ | PROT_WRITE,
- MAP_SHARED, bs->cow_fd, 0);
- if (bs->cow_bitmap_addr == MAP_FAILED)
- goto fail;
- bs->cow_bitmap = bs->cow_bitmap_addr + sizeof(cow_header);
- bs->cow_sectors_offset = (bs->cow_bitmap_size + 511) & ~511;
- snapshot = 0;
- } else
-#endif
- {
- /* standard raw image */
- size = lseek64(fd, 0, SEEK_END);
- bs->total_sectors = size / 512;
- bs->fd = fd;
}
+ return drv;
+}
+
+int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
+{
+ BlockDriverState *bs;
+ int ret;
+
+ bs = bdrv_new("");
+ if (!bs)
+ return -ENOMEM;
+ ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
+ if (ret < 0) {
+ bdrv_delete(bs);
+ return ret;
+ }
+ *pbs = bs;
+ return 0;
+}
-#ifndef _WIN32
- if (snapshot) {
- /* create a temporary COW file */
- cow_fd = mkstemp64(template);
- if (cow_fd < 0)
- goto fail;
- bs->cow_fd = cow_fd;
- unlink(template);
+int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
+{
+ return bdrv_open2(bs, filename, flags, NULL);
+}
+
+int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
+ BlockDriver *drv)
+{
+ int ret, open_flags;
+ char tmp_filename[1024];
+ char backing_filename[1024];
+
+ bs->read_only = 0;
+ bs->is_temporary = 0;
+ bs->encrypted = 0;
+
+ if (flags & BDRV_O_SNAPSHOT) {
+ BlockDriverState *bs1;
+ int64_t total_size;
- /* just need to allocate bitmap */
- bs->cow_bitmap_size = (bs->total_sectors + 7) >> 3;
- bs->cow_bitmap_addr = mmap(get_mmap_addr(bs->cow_bitmap_size),
- bs->cow_bitmap_size,
- PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (bs->cow_bitmap_addr == MAP_FAILED)
- goto fail;
- bs->cow_bitmap = bs->cow_bitmap_addr;
- bs->cow_sectors_offset = 0;
+ /* if snapshot, we create a temporary backing file and open it
+ instead of opening 'filename' directly */
+
+ /* if there is a backing file, use it */
+ bs1 = bdrv_new("");
+ if (!bs1) {
+ return -ENOMEM;
+ }
+ if (bdrv_open(bs1, filename, 0) < 0) {
+ bdrv_delete(bs1);
+ return -1;
+ }
+ total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
+ bdrv_delete(bs1);
+
+ get_tmp_filename(tmp_filename, sizeof(tmp_filename));
+ realpath(filename, backing_filename);
+ if (bdrv_create(&bdrv_qcow2, tmp_filename,
+ total_size, backing_filename, 0) < 0) {
+ return -1;
+ }
+ filename = tmp_filename;
+ bs->is_temporary = 1;
+ }
+
+ pstrcpy(bs->filename, sizeof(bs->filename), filename);
+ if (flags & BDRV_O_FILE) {
+ drv = find_protocol(filename);
+ if (!drv)
+ return -ENOENT;
+ } else {
+ if (!drv) {
+ drv = find_image_format(filename);
+ if (!drv)
+ return -1;
+ }
+ }
+ bs->drv = drv;
+ bs->opaque = qemu_mallocz(drv->instance_size);
+ if (bs->opaque == NULL && drv->instance_size > 0)
+ return -1;
+ /* Note: for compatibility, we open disk image files as RDWR, and
+ RDONLY as fallback */
+ if (!(flags & BDRV_O_FILE))
+ open_flags = BDRV_O_RDWR;
+ else
+ open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
+ ret = drv->bdrv_open(bs, filename, open_flags);
+ if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
+ ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
+ bs->read_only = 1;
+ }
+ if (ret < 0) {
+ qemu_free(bs->opaque);
+ bs->opaque = NULL;
+ bs->drv = NULL;
+ return ret;
+ }
+ if (drv->bdrv_getlength) {
+ bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
+ }
+#ifndef _WIN32
+ if (bs->is_temporary) {
+ unlink(filename);
}
#endif
-
- bs->inserted = 1;
+ if (bs->backing_file[0] != '\0') {
+ /* if there is a backing file, use it */
+ bs->backing_hd = bdrv_new("");
+ if (!bs->backing_hd) {
+ fail:
+ bdrv_close(bs);
+ return -ENOMEM;
+ }
+ path_combine(backing_filename, sizeof(backing_filename),
+ filename, bs->backing_file);
+ if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
+ goto fail;
+ }
/* call the change callback */
+ bs->media_changed = 1;
if (bs->change_cb)
bs->change_cb(bs->change_opaque);
return 0;
- fail:
- bdrv_close(bs);
- return -1;
}
void bdrv_close(BlockDriverState *bs)
{
- if (bs->inserted) {
-#ifndef _WIN32
- /* we unmap the mapping so that it is written to the COW file */
- if (bs->cow_bitmap_addr)
- munmap(bs->cow_bitmap_addr, bs->cow_bitmap_size);
+ if (bs->drv) {
+ if (bs->backing_hd)
+ bdrv_delete(bs->backing_hd);
+ bs->drv->bdrv_close(bs);
+ qemu_free(bs->opaque);
+#ifdef _WIN32
+ if (bs->is_temporary) {
+ unlink(bs->filename);
+ }
#endif
- if (bs->cow_fd >= 0)
- close(bs->cow_fd);
- if (bs->fd >= 0)
- close(bs->fd);
- bs->inserted = 0;
+ bs->opaque = NULL;
+ bs->drv = NULL;
/* call the change callback */
+ bs->media_changed = 1;
if (bs->change_cb)
bs->change_cb(bs->change_opaque);
}
void bdrv_delete(BlockDriverState *bs)
{
+ /* XXX: remove the driver list */
bdrv_close(bs);
qemu_free(bs);
}
-static inline void set_bit(uint8_t *bitmap, int64_t bitnum)
-{
- bitmap[bitnum / 8] |= (1 << (bitnum%8));
-}
-
-static inline int is_bit_set(const uint8_t *bitmap, int64_t bitnum)
+/* commit COW file into the raw image */
+int bdrv_commit(BlockDriverState *bs)
{
- return !!(bitmap[bitnum / 8] & (1 << (bitnum%8)));
-}
-
+ BlockDriver *drv = bs->drv;
+ int64_t i, total_sectors;
+ int n, j;
+ unsigned char sector[512];
-/* Return true if first block has been changed (ie. current version is
- * in COW file). Set the number of continuous blocks for which that
- * is true. */
-static int is_changed(uint8_t *bitmap,
- int64_t sector_num, int nb_sectors,
- int *num_same)
-{
- int changed;
+ if (!drv)
+ return -ENOMEDIUM;
- if (!bitmap || nb_sectors == 0) {
- *num_same = nb_sectors;
- return 0;
+ if (bs->read_only) {
+ return -EACCES;
}
- changed = is_bit_set(bitmap, sector_num);
- for (*num_same = 1; *num_same < nb_sectors; (*num_same)++) {
- if (is_bit_set(bitmap, sector_num + *num_same) != changed)
- break;
+ if (!bs->backing_hd) {
+ return -ENOTSUP;
}
- return changed;
-}
-
-/* commit COW file into the raw image */
-int bdrv_commit(BlockDriverState *bs)
-{
- int64_t i;
- uint8_t *cow_bitmap;
+ total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
+ for (i = 0; i < total_sectors;) {
+ if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
+ for(j = 0; j < n; j++) {
+ if (bdrv_read(bs, i, sector, 1) != 0) {
+ return -EIO;
+ }
- if (!bs->inserted)
- return -1;
-
- if (!bs->cow_bitmap) {
- fprintf(stderr, "Already committed to %s\n", bs->filename);
- return 0;
+ if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
+ return -EIO;
+ }
+ i++;
+ }
+ } else {
+ i += n;
+ }
}
- if (bs->read_only) {
- fprintf(stderr, "Can't commit to %s: read-only\n", bs->filename);
- return -1;
- }
-
- cow_bitmap = bs->cow_bitmap;
- for (i = 0; i < bs->total_sectors; i++) {
- if (is_bit_set(cow_bitmap, i)) {
- unsigned char sector[512];
- if (bdrv_read(bs, i, sector, 1) != 0) {
- fprintf(stderr, "Error reading sector %lli: aborting commit\n",
- (long long)i);
- return -1;
- }
+ if (drv->bdrv_make_empty)
+ return drv->bdrv_make_empty(bs);
- /* Make bdrv_write write to real file for a moment. */
- bs->cow_bitmap = NULL;
- if (bdrv_write(bs, i, sector, 1) != 0) {
- fprintf(stderr, "Error writing sector %lli: aborting commit\n",
- (long long)i);
- bs->cow_bitmap = cow_bitmap;
- return -1;
- }
- bs->cow_bitmap = cow_bitmap;
- }
- }
- fprintf(stderr, "Committed snapshot to %s\n", bs->filename);
return 0;
}
-/* return -1 if error */
+/* return < 0 if error. See bdrv_write() for the return codes */
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
- int ret, n, fd;
- int64_t offset;
-
- if (!bs->inserted)
- return -1;
+ BlockDriver *drv = bs->drv;
- while (nb_sectors > 0) {
- if (is_changed(bs->cow_bitmap, sector_num, nb_sectors, &n)) {
- fd = bs->cow_fd;
- offset = bs->cow_sectors_offset;
- } else if (sector_num == 0 && bs->boot_sector_enabled) {
- memcpy(buf, bs->boot_sector_data, 512);
- n = 1;
- goto next;
- } else {
- fd = bs->fd;
- offset = 0;
- }
+ if (!drv)
+ return -ENOMEDIUM;
- if (fd < 0) {
- /* no file, just return empty sectors */
- memset(buf, 0, n * 512);
- } else {
- offset += sector_num * 512;
- lseek64(fd, offset, SEEK_SET);
- ret = read(fd, buf, n * 512);
- if (ret != n * 512) {
- return -1;
- }
- }
- next:
- nb_sectors -= n;
- sector_num += n;
- buf += n * 512;
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
+ memcpy(buf, bs->boot_sector_data, 512);
+ sector_num++;
+ nb_sectors--;
+ buf += 512;
+ if (nb_sectors == 0)
+ return 0;
+ }
+ if (drv->bdrv_pread) {
+ int ret, len;
+ len = nb_sectors * 512;
+ ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
+ if (ret < 0)
+ return ret;
+ else if (ret != len)
+ return -EINVAL;
+ else
+ return 0;
+ } else {
+ return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
}
- return 0;
}
-/* return -1 if error */
+/* Return < 0 if error. Important errors are:
+ -EIO generic I/O error (may happen for all errors)
+ -ENOMEDIUM No media inserted.
+ -EINVAL Invalid sector number or nb_sectors
+ -EACCES Trying to write a read-only device
+*/
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
- int ret, fd, i;
- int64_t offset, retl;
-
- if (!bs->inserted)
- return -1;
+ BlockDriver *drv = bs->drv;
+ if (!bs->drv)
+ return -ENOMEDIUM;
if (bs->read_only)
- return -1;
-
- if (bs->cow_bitmap) {
- fd = bs->cow_fd;
- offset = bs->cow_sectors_offset;
+ return -EACCES;
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
+ memcpy(bs->boot_sector_data, buf, 512);
+ }
+ if (drv->bdrv_pwrite) {
+ int ret, len;
+ len = nb_sectors * 512;
+ ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
+ if (ret < 0)
+ return ret;
+ else if (ret != len)
+ return -EIO;
+ else
+ return 0;
} else {
- fd = bs->fd;
- offset = 0;
+ return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
}
-
- offset += sector_num * 512;
- retl = lseek64(fd, offset, SEEK_SET);
- if (retl == -1) {
- return -1;
+}
+
+static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
+ uint8_t *buf, int count1)
+{
+ uint8_t tmp_buf[SECTOR_SIZE];
+ int len, nb_sectors, count;
+ int64_t sector_num;
+
+ count = count1;
+ /* first read to align to sector start */
+ len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
+ if (len > count)
+ len = count;
+ sector_num = offset >> SECTOR_BITS;
+ if (len > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
+ count -= len;
+ if (count == 0)
+ return count1;
+ sector_num++;
+ buf += len;
}
- ret = write(fd, buf, nb_sectors * 512);
- if (ret != nb_sectors * 512) {
- return -1;
+
+ /* read the sectors "in place" */
+ nb_sectors = count >> SECTOR_BITS;
+ if (nb_sectors > 0) {
+ if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
+ return -EIO;
+ sector_num += nb_sectors;
+ len = nb_sectors << SECTOR_BITS;
+ buf += len;
+ count -= len;
}
- if (bs->cow_bitmap) {
- for (i = 0; i < nb_sectors; i++)
- set_bit(bs->cow_bitmap, sector_num + i);
+ /* add data from the last sector */
+ if (count > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(buf, tmp_buf, count);
}
- return 0;
+ return count1;
+}
+
+static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
+ const uint8_t *buf, int count1)
+{
+ uint8_t tmp_buf[SECTOR_SIZE];
+ int len, nb_sectors, count;
+ int64_t sector_num;
+
+ count = count1;
+ /* first write to align to sector start */
+ len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
+ if (len > count)
+ len = count;
+ sector_num = offset >> SECTOR_BITS;
+ if (len > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
+ if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ count -= len;
+ if (count == 0)
+ return count1;
+ sector_num++;
+ buf += len;
+ }
+
+ /* write the sectors "in place" */
+ nb_sectors = count >> SECTOR_BITS;
+ if (nb_sectors > 0) {
+ if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
+ return -EIO;
+ sector_num += nb_sectors;
+ len = nb_sectors << SECTOR_BITS;
+ buf += len;
+ count -= len;
+ }
+
+ /* add data from the last sector */
+ if (count > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(tmp_buf, buf, count);
+ if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ }
+ return count1;
+}
+
+/**
+ * Read with byte offsets (needed only for file protocols)
+ */
+int bdrv_pread(BlockDriverState *bs, int64_t offset,
+ void *buf1, int count1)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_pread)
+ return bdrv_pread_em(bs, offset, buf1, count1);
+ return drv->bdrv_pread(bs, offset, buf1, count1);
+}
+
+/**
+ * Write with byte offsets (needed only for file protocols)
+ */
+int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
+ const void *buf1, int count1)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_pwrite)
+ return bdrv_pwrite_em(bs, offset, buf1, count1);
+ return drv->bdrv_pwrite(bs, offset, buf1, count1);
+}
+
+/**
+ * Truncate file to 'offset' bytes (needed only for file protocols)
+ */
+int bdrv_truncate(BlockDriverState *bs, int64_t offset)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_truncate)
+ return -ENOTSUP;
+ return drv->bdrv_truncate(bs, offset);
+}
+
+/**
+ * Length of a file in bytes. Return < 0 if error or unknown.
+ */
+int64_t bdrv_getlength(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_getlength) {
+ /* legacy mode */
+ return bs->total_sectors * SECTOR_SIZE;
+ }
+ return drv->bdrv_getlength(bs);
}
+/* return 0 as number of sectors if no device present or error */
void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
{
- *nb_sectors_ptr = bs->total_sectors;
+ int64_t length;
+ length = bdrv_getlength(bs);
+ if (length < 0)
+ length = 0;
+ else
+ length = length >> SECTOR_BITS;
+ *nb_sectors_ptr = length;
}
/* force a given boot sector. */
type == BDRV_TYPE_FLOPPY));
}
+void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
+{
+ bs->translation = translation;
+}
+
void bdrv_get_geometry_hint(BlockDriverState *bs,
int *pcyls, int *pheads, int *psecs)
{
return bs->type;
}
+int bdrv_get_translation_hint(BlockDriverState *bs)
+{
+ return bs->translation;
+}
+
int bdrv_is_removable(BlockDriverState *bs)
{
return bs->removable;
return bs->read_only;
}
-int bdrv_is_inserted(BlockDriverState *bs)
+/* XXX: no longer used */
+void bdrv_set_change_cb(BlockDriverState *bs,
+ void (*change_cb)(void *opaque), void *opaque)
{
- return bs->inserted;
+ bs->change_cb = change_cb;
+ bs->change_opaque = opaque;
}
-int bdrv_is_locked(BlockDriverState *bs)
+int bdrv_is_encrypted(BlockDriverState *bs)
{
- return bs->locked;
+ if (bs->backing_hd && bs->backing_hd->encrypted)
+ return 1;
+ return bs->encrypted;
}
-void bdrv_set_locked(BlockDriverState *bs, int locked)
+int bdrv_set_key(BlockDriverState *bs, const char *key)
{
- bs->locked = locked;
+ int ret;
+ if (bs->backing_hd && bs->backing_hd->encrypted) {
+ ret = bdrv_set_key(bs->backing_hd, key);
+ if (ret < 0)
+ return ret;
+ if (!bs->encrypted)
+ return 0;
+ }
+ if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
+ return -1;
+ return bs->drv->bdrv_set_key(bs, key);
}
-void bdrv_set_change_cb(BlockDriverState *bs,
- void (*change_cb)(void *opaque), void *opaque)
+void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
{
- bs->change_cb = change_cb;
- bs->change_opaque = opaque;
+ if (!bs->drv) {
+ buf[0] = '\0';
+ } else {
+ pstrcpy(buf, buf_size, bs->drv->format_name);
+ }
+}
+
+void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
+ void *opaque)
+{
+ BlockDriver *drv;
+
+ for (drv = first_drv; drv != NULL; drv = drv->next) {
+ it(opaque, drv->format_name);
+ }
}
BlockDriverState *bdrv_find(const char *name)
}
}
+const char *bdrv_get_device_name(BlockDriverState *bs)
+{
+ return bs->device_name;
+}
+
+void bdrv_flush(BlockDriverState *bs)
+{
+ if (bs->drv->bdrv_flush)
+ bs->drv->bdrv_flush(bs);
+ if (bs->backing_hd)
+ bdrv_flush(bs->backing_hd);
+}
+
void bdrv_info(void)
{
BlockDriverState *bs;
if (bs->removable) {
term_printf(" locked=%d", bs->locked);
}
- if (bs->inserted) {
+ if (bs->drv) {
term_printf(" file=%s", bs->filename);
+ if (bs->backing_file[0] != '\0')
+ term_printf(" backing_file=%s", bs->backing_file);
term_printf(" ro=%d", bs->read_only);
+ term_printf(" drv=%s", bs->drv->format_name);
+ if (bs->encrypted)
+ term_printf(" encrypted");
} else {
term_printf(" [not inserted]");
}
term_printf("\n");
}
}
+
+void bdrv_get_backing_filename(BlockDriverState *bs,
+ char *filename, int filename_size)
+{
+ if (!bs->backing_hd) {
+ pstrcpy(filename, filename_size, "");
+ } else {
+ pstrcpy(filename, filename_size, bs->backing_file);
+ }
+}
+
+int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_write_compressed)
+ return -ENOTSUP;
+ return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
+}
+
+int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_get_info)
+ return -ENOTSUP;
+ memset(bdi, 0, sizeof(*bdi));
+ return drv->bdrv_get_info(bs, bdi);
+}
+
+/**************************************************************/
+/* handling of snapshots */
+
+int bdrv_snapshot_create(BlockDriverState *bs,
+ QEMUSnapshotInfo *sn_info)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_snapshot_create)
+ return -ENOTSUP;
+ return drv->bdrv_snapshot_create(bs, sn_info);
+}
+
+int bdrv_snapshot_goto(BlockDriverState *bs,
+ const char *snapshot_id)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_snapshot_goto)
+ return -ENOTSUP;
+ return drv->bdrv_snapshot_goto(bs, snapshot_id);
+}
+
+int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_snapshot_delete)
+ return -ENOTSUP;
+ return drv->bdrv_snapshot_delete(bs, snapshot_id);
+}
+
+int bdrv_snapshot_list(BlockDriverState *bs,
+ QEMUSnapshotInfo **psn_info)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_snapshot_list)
+ return -ENOTSUP;
+ return drv->bdrv_snapshot_list(bs, psn_info);
+}
+
+#define NB_SUFFIXES 4
+
+char *get_human_readable_size(char *buf, int buf_size, int64_t size)
+{
+ static const char suffixes[NB_SUFFIXES] = "KMGT";
+ int64_t base;
+ int i;
+
+ if (size <= 999) {
+ snprintf(buf, buf_size, "%" PRId64, 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, "%" PRId64 "%c",
+ ((size + (base >> 1)) / base),
+ suffixes[i]);
+ break;
+ }
+ base = base * 1024;
+ }
+ }
+ return buf;
+}
+
+char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
+{
+ char buf1[128], date_buf[128], clock_buf[128];
+ struct tm tm;
+ time_t ti;
+ int64_t secs;
+
+ if (!sn) {
+ snprintf(buf, buf_size,
+ "%-10s%-20s%7s%20s%15s",
+ "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
+ } else {
+ ti = sn->date_sec;
+#ifndef _WIN32
+ localtime_r(&ti, &tm);
+#endif
+ strftime(date_buf, sizeof(date_buf),
+ "%Y-%m-%d %H:%M:%S", &tm);
+ secs = sn->vm_clock_nsec / 1000000000;
+ snprintf(clock_buf, sizeof(clock_buf),
+ "%02d:%02d:%02d.%03d",
+ (int)(secs / 3600),
+ (int)((secs / 60) % 60),
+ (int)(secs % 60),
+ (int)((sn->vm_clock_nsec / 1000000) % 1000));
+ snprintf(buf, buf_size,
+ "%-10s%-20s%7s%20s%15s",
+ sn->id_str, sn->name,
+ get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
+ date_buf,
+ clock_buf);
+ }
+ return buf;
+}
+
+
+/**************************************************************/
+/* async I/Os */
+
+BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv)
+ return NULL;
+
+ /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
+ memcpy(buf, bs->boot_sector_data, 512);
+ sector_num++;
+ nb_sectors--;
+ buf += 512;
+ }
+
+ return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
+}
+
+BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv)
+ return NULL;
+ if (bs->read_only)
+ return NULL;
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
+ memcpy(bs->boot_sector_data, buf, 512);
+ }
+
+ return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
+}
+
+void bdrv_aio_cancel(BlockDriverAIOCB *acb)
+{
+ BlockDriver *drv = acb->bs->drv;
+
+ drv->bdrv_aio_cancel(acb);
+}
+
+
+/**************************************************************/
+/* async block device emulation */
+
+#ifdef QEMU_TOOL
+static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
+ int64_t sector_num, uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ int ret;
+ ret = bdrv_read(bs, sector_num, buf, nb_sectors);
+ cb(opaque, ret);
+ return NULL;
+}
+
+static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
+ int64_t sector_num, const uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ int ret;
+ ret = bdrv_write(bs, sector_num, buf, nb_sectors);
+ cb(opaque, ret);
+ return NULL;
+}
+
+static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
+{
+}
+#else
+static void bdrv_aio_bh_cb(void *opaque)
+{
+ BlockDriverAIOCBSync *acb = opaque;
+ acb->common.cb(acb->common.opaque, acb->ret);
+ qemu_aio_release(acb);
+}
+
+static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
+ int64_t sector_num, uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BlockDriverAIOCBSync *acb;
+ int ret;
+
+ acb = qemu_aio_get(bs, cb, opaque);
+ if (!acb->bh)
+ acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
+ ret = bdrv_read(bs, sector_num, buf, nb_sectors);
+ acb->ret = ret;
+ qemu_bh_schedule(acb->bh);
+ return &acb->common;
+}
+
+static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
+ int64_t sector_num, const uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BlockDriverAIOCBSync *acb;
+ int ret;
+
+ acb = qemu_aio_get(bs, cb, opaque);
+ if (!acb->bh)
+ acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
+ ret = bdrv_write(bs, sector_num, buf, nb_sectors);
+ acb->ret = ret;
+ qemu_bh_schedule(acb->bh);
+ return &acb->common;
+}
+
+static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
+{
+ BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
+ qemu_bh_cancel(acb->bh);
+ qemu_aio_release(acb);
+}
+#endif /* !QEMU_TOOL */
+
+/**************************************************************/
+/* sync block device emulation */
+
+static void bdrv_rw_em_cb(void *opaque, int ret)
+{
+ *(int *)opaque = ret;
+}
+
+#define NOT_DONE 0x7fffffff
+
+static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors)
+{
+ int async_ret;
+ BlockDriverAIOCB *acb;
+
+ async_ret = NOT_DONE;
+ qemu_aio_wait_start();
+ acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
+ bdrv_rw_em_cb, &async_ret);
+ if (acb == NULL) {
+ qemu_aio_wait_end();
+ return -1;
+ }
+ while (async_ret == NOT_DONE) {
+ qemu_aio_wait();
+ }
+ qemu_aio_wait_end();
+ return async_ret;
+}
+
+static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
+{
+ int async_ret;
+ BlockDriverAIOCB *acb;
+
+ async_ret = NOT_DONE;
+ qemu_aio_wait_start();
+ acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
+ bdrv_rw_em_cb, &async_ret);
+ if (acb == NULL) {
+ qemu_aio_wait_end();
+ return -1;
+ }
+ while (async_ret == NOT_DONE) {
+ qemu_aio_wait();
+ }
+ qemu_aio_wait_end();
+ return async_ret;
+}
+
+void bdrv_init(void)
+{
+ bdrv_register(&bdrv_raw);
+ bdrv_register(&bdrv_host_device);
+#ifndef _WIN32
+ bdrv_register(&bdrv_cow);
+#endif
+ bdrv_register(&bdrv_qcow);
+ bdrv_register(&bdrv_vmdk);
+ bdrv_register(&bdrv_cloop);
+ bdrv_register(&bdrv_dmg);
+ bdrv_register(&bdrv_bochs);
+ bdrv_register(&bdrv_vpc);
+ bdrv_register(&bdrv_vvfat);
+ bdrv_register(&bdrv_qcow2);
+}
+
+void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
+ void *opaque)
+{
+ BlockDriver *drv;
+ BlockDriverAIOCB *acb;
+
+ drv = bs->drv;
+ if (drv->free_aiocb) {
+ acb = drv->free_aiocb;
+ drv->free_aiocb = acb->next;
+ } else {
+ acb = qemu_mallocz(drv->aiocb_size);
+ if (!acb)
+ return NULL;
+ }
+ acb->bs = bs;
+ acb->cb = cb;
+ acb->opaque = opaque;
+ return acb;
+}
+
+void qemu_aio_release(void *p)
+{
+ BlockDriverAIOCB *acb = p;
+ BlockDriver *drv = acb->bs->drv;
+ acb->next = drv->free_aiocb;
+ drv->free_aiocb = acb;
+}
+
+/**************************************************************/
+/* removable device support */
+
+/**
+ * Return TRUE if the media is present
+ */
+int bdrv_is_inserted(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ int ret;
+ if (!drv)
+ return 0;
+ if (!drv->bdrv_is_inserted)
+ return 1;
+ ret = drv->bdrv_is_inserted(bs);
+ return ret;
+}
+
+/**
+ * Return TRUE if the media changed since the last call to this
+ * function. It is currently only used for floppy disks
+ */
+int bdrv_media_changed(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ int ret;
+
+ if (!drv || !drv->bdrv_media_changed)
+ ret = -ENOTSUP;
+ else
+ ret = drv->bdrv_media_changed(bs);
+ if (ret == -ENOTSUP)
+ ret = bs->media_changed;
+ bs->media_changed = 0;
+ return ret;
+}
+
+/**
+ * If eject_flag is TRUE, eject the media. Otherwise, close the tray
+ */
+void bdrv_eject(BlockDriverState *bs, int eject_flag)
+{
+ BlockDriver *drv = bs->drv;
+ int ret;
+
+ if (!drv || !drv->bdrv_eject) {
+ ret = -ENOTSUP;
+ } else {
+ ret = drv->bdrv_eject(bs, eject_flag);
+ }
+ if (ret == -ENOTSUP) {
+ if (eject_flag)
+ bdrv_close(bs);
+ }
+}
+
+int bdrv_is_locked(BlockDriverState *bs)
+{
+ return bs->locked;
+}
+
+/**
+ * Lock or unlock the media (if it is locked, the user won't be able
+ * to eject it manually).
+ */
+void bdrv_set_locked(BlockDriverState *bs, int locked)
+{
+ BlockDriver *drv = bs->drv;
+
+ bs->locked = locked;
+ if (drv && drv->bdrv_set_locked) {
+ drv->bdrv_set_locked(bs, locked);
+ }
+}
projects / qemu.git / blobdiff