/*
* QEMU System Emulator block driver
- *
+ *
* 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
#include <sys/disk.h>
#endif
+#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;
+int path_is_absolute(const char *path)
+{
+ const char *p;
+#ifdef _WIN32
+ /* specific case for names like: "\\.\d:" */
+ if (*path == '/' || *path == '\\')
+ return 1;
+#endif
+ p = strchr(path, ':');
+ if (p)
+ p++;
+ else
+ p = path;
+#ifdef _WIN32
+ return (*p == '/' || *p == '\\');
+#else
+ return (*p == '/');
+#endif
+}
+
+/* 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, '/');
+#ifdef _WIN32
+ {
+ const char *p2;
+ p2 = strrchr(base_path, '\\');
+ if (!p1 || p2 > p1)
+ p1 = p2;
+ }
+#endif
+ 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;
}
return NULL;
}
-int bdrv_create(BlockDriver *drv,
+int bdrv_create(BlockDriver *drv,
const char *filename, int64_t size_in_sectors,
const char *backing_file, int flags)
{
}
#ifdef _WIN32
-static void get_tmp_filename(char *filename, int size)
+void get_tmp_filename(char *filename, int size)
{
- /* XXX: find a better function */
- tmpnam(filename);
+ char temp_dir[MAX_PATH];
+
+ GetTempPath(MAX_PATH, temp_dir);
+ GetTempFileName(temp_dir, "qem", 0, filename);
}
#else
-static void get_tmp_filename(char *filename, int size)
+void get_tmp_filename(char *filename, int size)
{
int fd;
/* XXX: race condition possible */
}
#endif
+#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;
+
+#ifdef _WIN32
+ if (is_windows_drive(filename) ||
+ is_windows_drive_prefix(filename))
+ return &bdrv_raw;
+#endif
+ 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 fd, ret, score, score_max;
+ int ret, score, score_max;
BlockDriver *drv1, *drv;
- uint8_t *buf;
- size_t bufsize = 1024;
+ uint8_t buf[2048];
+ BlockDriverState *bs;
- fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
- if (fd < 0)
- return NULL;
-#ifdef DIOCGSECTORSIZE
+ /* 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
+ if (is_windows_drive(filename))
+ return &bdrv_host_device;
+#else
{
- unsigned int sectorsize = 512;
- if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) &&
- sectorsize > bufsize)
- bufsize = sectorsize;
+ struct stat st;
+ if (stat(filename, &st) >= 0 &&
+ (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
+ return &bdrv_host_device;
+ }
}
#endif
- buf = malloc(bufsize);
- if (!buf)
+
+ drv = find_protocol(filename);
+ /* no need to test disk image formats for vvfat */
+ if (drv == &bdrv_vvfat)
+ return drv;
+
+ ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
+ if (ret < 0)
return NULL;
- ret = read(fd, buf, bufsize);
+ ret = bdrv_pread(bs, 0, buf, sizeof(buf));
+ bdrv_delete(bs);
if (ret < 0) {
- close(fd);
- free(buf);
return NULL;
}
- close(fd);
-
- drv = NULL;
+
score_max = 0;
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
- score = drv1->bdrv_probe(buf, ret, filename);
- if (score > score_max) {
- score_max = score;
- drv = drv1;
+ if (drv1->bdrv_probe) {
+ score = drv1->bdrv_probe(buf, ret, filename);
+ if (score > score_max) {
+ score_max = score;
+ drv = drv1;
+ }
}
}
- free(buf);
return drv;
}
-int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
+int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
{
- return bdrv_open2(bs, filename, snapshot, NULL);
+ 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;
}
-int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
+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;
- char tmp_filename[1024];
-
+ int ret, open_flags;
+ char tmp_filename[PATH_MAX];
+ char backing_filename[PATH_MAX];
+
bs->read_only = 0;
bs->is_temporary = 0;
bs->encrypted = 0;
-
- if (snapshot) {
+
+ if (flags & BDRV_O_SNAPSHOT) {
BlockDriverState *bs1;
int64_t total_size;
-
+
/* 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 -1;
+ return -ENOMEM;
}
if (bdrv_open(bs1, filename, 0) < 0) {
bdrv_delete(bs1);
return -1;
}
- total_size = bs1->total_sectors;
+ total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
bdrv_delete(bs1);
-
+
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
- /* XXX: use cow for linux as it is more efficient ? */
- if (bdrv_create(&bdrv_qcow, tmp_filename,
- total_size, filename, 0) < 0) {
+ 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 (!drv) {
- drv = find_image_format(filename);
+ if (flags & BDRV_O_FILE) {
+ drv = find_protocol(filename);
if (!drv)
- return -1;
+ 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;
-
- ret = drv->bdrv_open(bs, filename);
+ /* 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);
- return -1;
+ 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
- if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) {
+ 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 -1;
+ return -ENOMEM;
}
- if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0)
+ path_combine(backing_filename, sizeof(backing_filename),
+ filename, bs->backing_file);
+ if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
goto fail;
}
- bs->inserted = 1;
-
/* call the change callback */
+ bs->media_changed = 1;
if (bs->change_cb)
bs->change_cb(bs->change_opaque);
void bdrv_close(BlockDriverState *bs)
{
- if (bs->inserted) {
+ if (bs->drv) {
if (bs->backing_hd)
bdrv_delete(bs->backing_hd);
bs->drv->bdrv_close(bs);
#endif
bs->opaque = NULL;
bs->drv = NULL;
- bs->inserted = 0;
/* call the change callback */
+ bs->media_changed = 1;
if (bs->change_cb)
bs->change_cb(bs->change_opaque);
}
/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
- int64_t i;
+ BlockDriver *drv = bs->drv;
+ int64_t i, total_sectors;
int n, j;
unsigned char sector[512];
- if (!bs->inserted)
- return -ENOENT;
+ if (!drv)
+ return -ENOMEDIUM;
if (bs->read_only) {
return -EACCES;
return -ENOTSUP;
}
- for (i = 0; i < bs->total_sectors;) {
- if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
+ 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;
i += n;
}
}
+
+ if (drv->bdrv_make_empty)
+ return drv->bdrv_make_empty(bs);
+
return 0;
}
-/* return -1 if error */
-int bdrv_read(BlockDriverState *bs, int64_t sector_num,
+/* 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;
BlockDriver *drv = bs->drv;
- if (!bs->inserted)
- return -1;
+ if (!drv)
+ return -ENOMEDIUM;
- while (nb_sectors > 0) {
- if (sector_num == 0 && bs->boot_sector_enabled) {
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(buf, bs->boot_sector_data, 512);
- n = 1;
- } else if (bs->backing_hd) {
- if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
- ret = drv->bdrv_read(bs, sector_num, buf, n);
- if (ret < 0)
- return -1;
- } else {
- /* read from the base image */
- ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
- if (ret < 0)
- return -1;
- }
- } else {
- ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors);
- if (ret < 0)
- return -1;
- /* no need to loop */
- break;
- }
- nb_sectors -= n;
- sector_num += n;
- buf += n * 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 */
-int bdrv_write(BlockDriverState *bs, int64_t sector_num,
+/* 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)
{
- if (!bs->inserted)
- return -1;
+ BlockDriver *drv = bs->drv;
+ if (!bs->drv)
+ return -ENOMEDIUM;
if (bs->read_only)
- return -1;
- return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors);
+ 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 {
+ return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
+ }
+}
+
+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;
+ }
+
+ /* 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;
+ }
+
+ /* 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 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. */
memset(bs->boot_sector_data + size, 0, 512 - size);
}
-void bdrv_set_geometry_hint(BlockDriverState *bs,
+void bdrv_set_geometry_hint(BlockDriverState *bs,
int cyls, int heads, int secs)
{
bs->cyls = cyls;
bs->translation = translation;
}
-void bdrv_get_geometry_hint(BlockDriverState *bs,
+void bdrv_get_geometry_hint(BlockDriverState *bs,
int *pcyls, int *pheads, int *psecs)
{
*pcyls = bs->cyls;
return bs->read_only;
}
-int bdrv_is_inserted(BlockDriverState *bs)
-{
- return bs->inserted;
-}
-
-int bdrv_is_locked(BlockDriverState *bs)
-{
- return bs->locked;
-}
-
-void bdrv_set_locked(BlockDriverState *bs, int locked)
-{
- bs->locked = locked;
-}
-
-void bdrv_set_change_cb(BlockDriverState *bs,
+/* XXX: no longer used */
+void bdrv_set_change_cb(BlockDriverState *bs,
void (*change_cb)(void *opaque), void *opaque)
{
bs->change_cb = change_cb;
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
{
- if (!bs->inserted || !bs->drv) {
+ 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 bdrv_iterate_format(void (*it)(void *opaque, const char *name),
void *opaque)
{
BlockDriver *drv;
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) {
- term_printf(" file=%s", bs->filename);
- if (bs->backing_file[0] != '\0')
- term_printf(" backing_file=%s", bs->backing_file);
+ if (bs->drv) {
+ term_printf(" file=");
+ term_print_filename(bs->filename);
+ if (bs->backing_file[0] != '\0') {
+ term_printf(" backing_file=");
+ term_print_filename(bs->backing_file);
+ }
term_printf(" ro=%d", bs->read_only);
term_printf(" drv=%s", bs->drv->format_name);
if (bs->encrypted)
}
}
+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);
+}
/**************************************************************/
-/* RAW block driver */
+/* handling of snapshots */
-typedef struct BDRVRawState {
- int fd;
-} BDRVRawState;
+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);
+}
-static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
+int bdrv_snapshot_goto(BlockDriverState *bs,
+ const char *snapshot_id)
{
- return 1; /* maybe */
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_snapshot_goto)
+ return -ENOTSUP;
+ return drv->bdrv_snapshot_goto(bs, snapshot_id);
}
-static int raw_open(BlockDriverState *bs, const char *filename)
+int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
{
- BDRVRawState *s = bs->opaque;
- int fd;
- int64_t size;
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOMEDIUM;
+ if (!drv->bdrv_snapshot_delete)
+ return -ENOTSUP;
+ return drv->bdrv_snapshot_delete(bs, snapshot_id);
+}
- fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
- if (fd < 0) {
- fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
- if (fd < 0)
- return -1;
- bs->read_only = 1;
+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;
+ }
}
-#ifdef _BSD
- {
- struct stat sb;
- if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
-#ifdef DIOCGMEDIASIZE
- if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
-#endif
- size = lseek(fd, 0LL, SEEK_END);
- } else
+ return buf;
+}
+
+char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
+{
+ char buf1[128], date_buf[128], clock_buf[128];
+#ifdef _WIN32
+ struct tm *ptm;
+#else
+ struct tm tm;
#endif
- {
- size = lseek(fd, 0, SEEK_END);
- }
+ 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;
#ifdef _WIN32
- /* On Windows hosts it can happen that we're unable to get file size
- for CD-ROM raw device (it's inherent limitation of the CDFS driver). */
- if (size == -1)
- size = LONG_LONG_MAX;
+ ptm = localtime(&ti);
+ strftime(date_buf, sizeof(date_buf),
+ "%Y-%m-%d %H:%M:%S", ptm);
+#else
+ localtime_r(&ti, &tm);
+ strftime(date_buf, sizeof(date_buf),
+ "%Y-%m-%d %H:%M:%S", &tm);
#endif
- bs->total_sectors = size / 512;
- s->fd = fd;
- return 0;
+ 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);
}
-static int raw_read(BlockDriverState *bs, int64_t sector_num,
- uint8_t *buf, int nb_sectors)
+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)
{
- BDRVRawState *s = bs->opaque;
int ret;
-
- lseek(s->fd, sector_num * 512, SEEK_SET);
- ret = read(s->fd, buf, nb_sectors * 512);
- if (ret != nb_sectors * 512)
- return -1;
- return 0;
+ ret = bdrv_read(bs, sector_num, buf, nb_sectors);
+ cb(opaque, ret);
+ return NULL;
}
-static int raw_write(BlockDriverState *bs, int64_t sector_num,
- const uint8_t *buf, int nb_sectors)
+static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
+ int64_t sector_num, const uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
{
- BDRVRawState *s = bs->opaque;
int ret;
-
- lseek(s->fd, sector_num * 512, SEEK_SET);
- ret = write(s->fd, buf, nb_sectors * 512);
- if (ret != nb_sectors * 512)
- return -1;
- return 0;
+ ret = bdrv_write(bs, sector_num, buf, nb_sectors);
+ cb(opaque, ret);
+ return NULL;
}
-static void raw_close(BlockDriverState *bs)
+static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
+{
+}
+#else
+static void bdrv_aio_bh_cb(void *opaque)
{
- BDRVRawState *s = bs->opaque;
- close(s->fd);
+ BlockDriverAIOCBSync *acb = opaque;
+ acb->common.cb(acb->common.opaque, acb->ret);
+ qemu_aio_release(acb);
}
-static int raw_create(const char *filename, int64_t total_size,
- const char *backing_file, int flags)
+static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
+ int64_t sector_num, uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
{
- int fd;
+ BlockDriverAIOCBSync *acb;
+ int ret;
- if (flags || backing_file)
- return -ENOTSUP;
+ 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;
+}
- fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
- 0644);
- if (fd < 0)
- return -EIO;
- ftruncate(fd, total_size * 512);
- close(fd);
- return 0;
+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 */
-BlockDriver bdrv_raw = {
- "raw",
- sizeof(BDRVRawState),
- raw_probe,
- raw_open,
- raw_read,
- raw_write,
- raw_close,
- raw_create,
-};
+/**************************************************************/
+/* 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_cloop);
bdrv_register(&bdrv_dmg);
bdrv_register(&bdrv_bochs);
+ bdrv_register(&bdrv_vpc);
+ bdrv_register(&bdrv_vvfat);
+ bdrv_register(&bdrv_qcow2);
+ bdrv_register(&bdrv_parallels);
+}
+
+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