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qemu/block/raw-posix.c

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/*
* Block driver for RAW files (posix)
*
* Copyright (c) 2006 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
* 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 "qemu/timer.h"
#include "qemu/log.h"
#include "block/block_int.h"
#include "qemu/module.h"
#include "trace.h"
#include "block/thread-pool.h"
#include "qemu/iov.h"
#include "raw-aio.h"
#include "qapi/util.h"
#if defined(__APPLE__) && (__MACH__)
#include <paths.h>
#include <sys/param.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOBSD.h>
#include <IOKit/storage/IOMediaBSDClient.h>
#include <IOKit/storage/IOMedia.h>
#include <IOKit/storage/IOCDMedia.h>
//#include <IOKit/storage/IOCDTypes.h>
#include <CoreFoundation/CoreFoundation.h>
#endif
#ifdef __sun__
#define _POSIX_PTHREAD_SEMANTICS 1
#include <sys/dkio.h>
#endif
#ifdef __linux__
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <linux/cdrom.h>
#include <linux/fd.h>
#include <linux/fs.h>
#ifndef FS_NOCOW_FL
#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
#endif
#endif
#ifdef CONFIG_FIEMAP
#include <linux/fiemap.h>
#endif
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
#include <linux/falloc.h>
#endif
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/disk.h>
#include <sys/cdio.h>
#endif
#ifdef __OpenBSD__
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/dkio.h>
#endif
#ifdef __NetBSD__
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/dkio.h>
#include <sys/disk.h>
#endif
#ifdef __DragonFly__
#include <sys/ioctl.h>
#include <sys/diskslice.h>
#endif
#ifdef CONFIG_XFS
#include <xfs/xfs.h>
#endif
//#define DEBUG_FLOPPY
//#define DEBUG_BLOCK
#if defined(DEBUG_BLOCK)
#define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \
{ qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0)
#else
#define DEBUG_BLOCK_PRINT(formatCstr, ...)
#endif
/* OS X does not have O_DSYNC */
#ifndef O_DSYNC
#ifdef O_SYNC
#define O_DSYNC O_SYNC
#elif defined(O_FSYNC)
#define O_DSYNC O_FSYNC
#endif
#endif
/* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
#ifndef O_DIRECT
#define O_DIRECT O_DSYNC
#endif
#define FTYPE_FILE 0
#define FTYPE_CD 1
#define FTYPE_FD 2
/* if the FD is not accessed during that time (in ns), we try to
reopen it to see if the disk has been changed */
#define FD_OPEN_TIMEOUT (1000000000)
#define MAX_BLOCKSIZE 4096
typedef struct BDRVRawState {
int fd;
int type;
int open_flags;
size_t buf_align;
#if defined(__linux__)
/* linux floppy specific */
int64_t fd_open_time;
int64_t fd_error_time;
int fd_got_error;
int fd_media_changed;
#endif
#ifdef CONFIG_LINUX_AIO
int use_aio;
void *aio_ctx;
#endif
#ifdef CONFIG_XFS
bool is_xfs:1;
#endif
bool has_discard:1;
bool has_write_zeroes:1;
bool discard_zeroes:1;
#ifdef CONFIG_FIEMAP
bool skip_fiemap;
#endif
} BDRVRawState;
typedef struct BDRVRawReopenState {
int fd;
int open_flags;
#ifdef CONFIG_LINUX_AIO
int use_aio;
#endif
} BDRVRawReopenState;
static int fd_open(BlockDriverState *bs);
static int64_t raw_getlength(BlockDriverState *bs);
typedef struct RawPosixAIOData {
BlockDriverState *bs;
int aio_fildes;
union {
struct iovec *aio_iov;
void *aio_ioctl_buf;
};
int aio_niov;
uint64_t aio_nbytes;
#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
off_t aio_offset;
int aio_type;
} RawPosixAIOData;
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
static int cdrom_reopen(BlockDriverState *bs);
#endif
#if defined(__NetBSD__)
static int raw_normalize_devicepath(const char **filename)
{
static char namebuf[PATH_MAX];
const char *dp, *fname;
struct stat sb;
fname = *filename;
dp = strrchr(fname, '/');
if (lstat(fname, &sb) < 0) {
fprintf(stderr, "%s: stat failed: %s\n",
fname, strerror(errno));
return -errno;
}
if (!S_ISBLK(sb.st_mode)) {
return 0;
}
if (dp == NULL) {
snprintf(namebuf, PATH_MAX, "r%s", fname);
} else {
snprintf(namebuf, PATH_MAX, "%.*s/r%s",
(int)(dp - fname), fname, dp + 1);
}
fprintf(stderr, "%s is a block device", fname);
*filename = namebuf;
fprintf(stderr, ", using %s\n", *filename);
return 0;
}
#else
static int raw_normalize_devicepath(const char **filename)
{
return 0;
}
#endif
static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
{
BDRVRawState *s = bs->opaque;
char *buf;
unsigned int sector_size;
/* For /dev/sg devices the alignment is not really used.
With buffered I/O, we don't have any restrictions. */
if (bs->sg || !(s->open_flags & O_DIRECT)) {
bs->request_alignment = 1;
s->buf_align = 1;
return;
}
/* Try a few ioctls to get the right size */
bs->request_alignment = 0;
s->buf_align = 0;
#ifdef BLKSSZGET
if (ioctl(fd, BLKSSZGET, &sector_size) >= 0) {
bs->request_alignment = sector_size;
}
#endif
#ifdef DKIOCGETBLOCKSIZE
if (ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) >= 0) {
bs->request_alignment = sector_size;
}
#endif
#ifdef DIOCGSECTORSIZE
if (ioctl(fd, DIOCGSECTORSIZE, &sector_size) >= 0) {
bs->request_alignment = sector_size;
}
#endif
#ifdef CONFIG_XFS
if (s->is_xfs) {
struct dioattr da;
if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
bs->request_alignment = da.d_miniosz;
/* The kernel returns wrong information for d_mem */
/* s->buf_align = da.d_mem; */
}
}
#endif
/* If we could not get the sizes so far, we can only guess them */
if (!s->buf_align) {
size_t align;
buf = qemu_memalign(MAX_BLOCKSIZE, 2 * MAX_BLOCKSIZE);
for (align = 512; align <= MAX_BLOCKSIZE; align <<= 1) {
if (pread(fd, buf + align, MAX_BLOCKSIZE, 0) >= 0) {
s->buf_align = align;
break;
}
}
qemu_vfree(buf);
}
if (!bs->request_alignment) {
size_t align;
buf = qemu_memalign(s->buf_align, MAX_BLOCKSIZE);
for (align = 512; align <= MAX_BLOCKSIZE; align <<= 1) {
if (pread(fd, buf, align, 0) >= 0) {
bs->request_alignment = align;
break;
}
}
qemu_vfree(buf);
}
if (!s->buf_align || !bs->request_alignment) {
error_setg(errp, "Could not find working O_DIRECT alignment. "
"Try cache.direct=off.");
}
}
static void raw_parse_flags(int bdrv_flags, int *open_flags)
{
assert(open_flags != NULL);
*open_flags |= O_BINARY;
*open_flags &= ~O_ACCMODE;
if (bdrv_flags & BDRV_O_RDWR) {
*open_flags |= O_RDWR;
} else {
*open_flags |= O_RDONLY;
}
/* Use O_DSYNC for write-through caching, no flags for write-back caching,
* and O_DIRECT for no caching. */
if ((bdrv_flags & BDRV_O_NOCACHE)) {
*open_flags |= O_DIRECT;
}
}
static void raw_detach_aio_context(BlockDriverState *bs)
{
#ifdef CONFIG_LINUX_AIO
BDRVRawState *s = bs->opaque;
if (s->use_aio) {
laio_detach_aio_context(s->aio_ctx, bdrv_get_aio_context(bs));
}
#endif
}
static void raw_attach_aio_context(BlockDriverState *bs,
AioContext *new_context)
{
#ifdef CONFIG_LINUX_AIO
BDRVRawState *s = bs->opaque;
if (s->use_aio) {
laio_attach_aio_context(s->aio_ctx, new_context);
}
#endif
}
#ifdef CONFIG_LINUX_AIO
static int raw_set_aio(void **aio_ctx, int *use_aio, int bdrv_flags)
{
int ret = -1;
assert(aio_ctx != NULL);
assert(use_aio != NULL);
/*
* Currently Linux do AIO only for files opened with O_DIRECT
* specified so check NOCACHE flag too
*/
if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
(BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
/* if non-NULL, laio_init() has already been run */
if (*aio_ctx == NULL) {
*aio_ctx = laio_init();
if (!*aio_ctx) {
goto error;
}
}
*use_aio = 1;
} else {
*use_aio = 0;
}
ret = 0;
error:
return ret;
}
#endif
static void raw_parse_filename(const char *filename, QDict *options,
Error **errp)
{
/* The filename does not have to be prefixed by the protocol name, since
* "file" is the default protocol; therefore, the return value of this
* function call can be ignored. */
strstart(filename, "file:", &filename);
qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
}
static QemuOptsList raw_runtime_opts = {
.name = "raw",
.head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
.desc = {
{
.name = "filename",
.type = QEMU_OPT_STRING,
.help = "File name of the image",
},
{ /* end of list */ }
},
};
static int raw_open_common(BlockDriverState *bs, QDict *options,
int bdrv_flags, int open_flags, Error **errp)
{
BDRVRawState *s = bs->opaque;
QemuOpts *opts;
Error *local_err = NULL;
const char *filename = NULL;
int fd, ret;
struct stat st;
opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto fail;
}
filename = qemu_opt_get(opts, "filename");
ret = raw_normalize_devicepath(&filename);
if (ret != 0) {
error_setg_errno(errp, -ret, "Could not normalize device path");
goto fail;
}
s->open_flags = open_flags;
raw_parse_flags(bdrv_flags, &s->open_flags);
s->fd = -1;
fd = qemu_open(filename, s->open_flags, 0644);
if (fd < 0) {
ret = -errno;
if (ret == -EROFS) {
ret = -EACCES;
}
goto fail;
}
s->fd = fd;
#ifdef CONFIG_LINUX_AIO
if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
qemu_close(fd);
ret = -errno;
error_setg_errno(errp, -ret, "Could not set AIO state");
goto fail;
}
#endif
s->has_discard = true;
s->has_write_zeroes = true;
if (fstat(s->fd, &st) < 0) {
error_setg_errno(errp, errno, "Could not stat file");
goto fail;
}
if (S_ISREG(st.st_mode)) {
s->discard_zeroes = true;
}
if (S_ISBLK(st.st_mode)) {
#ifdef BLKDISCARDZEROES
unsigned int arg;
if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) {
s->discard_zeroes = true;
}
#endif
#ifdef __linux__
/* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
* not rely on the contents of discarded blocks unless using O_DIRECT.
* Same for BLKZEROOUT.
*/
if (!(bs->open_flags & BDRV_O_NOCACHE)) {
s->discard_zeroes = false;
s->has_write_zeroes = false;
}
#endif
}
#ifdef CONFIG_XFS
if (platform_test_xfs_fd(s->fd)) {
s->is_xfs = true;
}
#endif
raw_attach_aio_context(bs, bdrv_get_aio_context(bs));
ret = 0;
fail:
if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
unlink(filename);
}
qemu_opts_del(opts);
return ret;
}
static int raw_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVRawState *s = bs->opaque;
Error *local_err = NULL;
int ret;
s->type = FTYPE_FILE;
ret = raw_open_common(bs, options, flags, 0, &local_err);
if (local_err) {
error_propagate(errp, local_err);
}
return ret;
}
static int raw_reopen_prepare(BDRVReopenState *state,
BlockReopenQueue *queue, Error **errp)
{
BDRVRawState *s;
BDRVRawReopenState *raw_s;
int ret = 0;
Error *local_err = NULL;
assert(state != NULL);
assert(state->bs != NULL);
s = state->bs->opaque;
state->opaque = g_new0(BDRVRawReopenState, 1);
raw_s = state->opaque;
#ifdef CONFIG_LINUX_AIO
raw_s->use_aio = s->use_aio;
/* we can use s->aio_ctx instead of a copy, because the use_aio flag is
* valid in the 'false' condition even if aio_ctx is set, and raw_set_aio()
* won't override aio_ctx if aio_ctx is non-NULL */
if (raw_set_aio(&s->aio_ctx, &raw_s->use_aio, state->flags)) {
error_setg(errp, "Could not set AIO state");
return -1;
}
#endif
if (s->type == FTYPE_FD || s->type == FTYPE_CD) {
raw_s->open_flags |= O_NONBLOCK;
}
raw_parse_flags(state->flags, &raw_s->open_flags);
raw_s->fd = -1;
int fcntl_flags = O_APPEND | O_NONBLOCK;
#ifdef O_NOATIME
fcntl_flags |= O_NOATIME;
#endif
#ifdef O_ASYNC
/* Not all operating systems have O_ASYNC, and those that don't
* will not let us track the state into raw_s->open_flags (typically
* you achieve the same effect with an ioctl, for example I_SETSIG
* on Solaris). But we do not use O_ASYNC, so that's fine.
*/
assert((s->open_flags & O_ASYNC) == 0);
#endif
if ((raw_s->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
/* dup the original fd */
/* TODO: use qemu fcntl wrapper */
#ifdef F_DUPFD_CLOEXEC
raw_s->fd = fcntl(s->fd, F_DUPFD_CLOEXEC, 0);
#else
raw_s->fd = dup(s->fd);
if (raw_s->fd != -1) {
qemu_set_cloexec(raw_s->fd);
}
#endif
if (raw_s->fd >= 0) {
ret = fcntl_setfl(raw_s->fd, raw_s->open_flags);
if (ret) {
qemu_close(raw_s->fd);
raw_s->fd = -1;
}
}
}
/* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
if (raw_s->fd == -1) {
assert(!(raw_s->open_flags & O_CREAT));
raw_s->fd = qemu_open(state->bs->filename, raw_s->open_flags);
if (raw_s->fd == -1) {
error_setg_errno(errp, errno, "Could not reopen file");
ret = -1;
}
}
/* Fail already reopen_prepare() if we can't get a working O_DIRECT
* alignment with the new fd. */
if (raw_s->fd != -1) {
raw_probe_alignment(state->bs, raw_s->fd, &local_err);
if (local_err) {
qemu_close(raw_s->fd);
raw_s->fd = -1;
error_propagate(errp, local_err);
ret = -EINVAL;
}
}
return ret;
}
static void raw_reopen_commit(BDRVReopenState *state)
{
BDRVRawReopenState *raw_s = state->opaque;
BDRVRawState *s = state->bs->opaque;
s->open_flags = raw_s->open_flags;
qemu_close(s->fd);
s->fd = raw_s->fd;
#ifdef CONFIG_LINUX_AIO
s->use_aio = raw_s->use_aio;
#endif
g_free(state->opaque);
state->opaque = NULL;
}
static void raw_reopen_abort(BDRVReopenState *state)
{
BDRVRawReopenState *raw_s = state->opaque;
/* nothing to do if NULL, we didn't get far enough */
if (raw_s == NULL) {
return;
}
if (raw_s->fd >= 0) {
qemu_close(raw_s->fd);
raw_s->fd = -1;
}
g_free(state->opaque);
state->opaque = NULL;
}
static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVRawState *s = bs->opaque;
raw_probe_alignment(bs, s->fd, errp);
bs->bl.opt_mem_alignment = s->buf_align;
}
static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
{
int ret;
ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
if (ret == -1) {
return -errno;
}
return 0;
}
static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
{
int ret;
ret = qemu_fdatasync(aiocb->aio_fildes);
if (ret == -1) {
return -errno;
}
return 0;
}
#ifdef CONFIG_PREADV
static bool preadv_present = true;
static ssize_t
qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
{
return preadv(fd, iov, nr_iov, offset);
}
static ssize_t
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
{
return pwritev(fd, iov, nr_iov, offset);
}
#else
static bool preadv_present = false;
static ssize_t
qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
{
return -ENOSYS;
}
static ssize_t
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
{
return -ENOSYS;
}
#endif
static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
{
ssize_t len;
do {
if (aiocb->aio_type & QEMU_AIO_WRITE)
len = qemu_pwritev(aiocb->aio_fildes,
aiocb->aio_iov,
aiocb->aio_niov,
aiocb->aio_offset);
else
len = qemu_preadv(aiocb->aio_fildes,
aiocb->aio_iov,
aiocb->aio_niov,
aiocb->aio_offset);
} while (len == -1 && errno == EINTR);
if (len == -1) {
return -errno;
}
return len;
}
/*
* Read/writes the data to/from a given linear buffer.
*
* Returns the number of bytes handles or -errno in case of an error. Short
* reads are only returned if the end of the file is reached.
*/
static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
{
ssize_t offset = 0;
ssize_t len;
while (offset < aiocb->aio_nbytes) {
if (aiocb->aio_type & QEMU_AIO_WRITE) {
len = pwrite(aiocb->aio_fildes,
(const char *)buf + offset,
aiocb->aio_nbytes - offset,
aiocb->aio_offset + offset);
} else {
len = pread(aiocb->aio_fildes,
buf + offset,
aiocb->aio_nbytes - offset,
aiocb->aio_offset + offset);
}
if (len == -1 && errno == EINTR) {
continue;
} else if (len == -1 && errno == EINVAL &&
(aiocb->bs->open_flags & BDRV_O_NOCACHE) &&
!(aiocb->aio_type & QEMU_AIO_WRITE) &&
offset > 0) {
/* O_DIRECT pread() may fail with EINVAL when offset is unaligned
* after a short read. Assume that O_DIRECT short reads only occur
* at EOF. Therefore this is a short read, not an I/O error.
*/
break;
} else if (len == -1) {
offset = -errno;
break;
} else if (len == 0) {
break;
}
offset += len;
}
return offset;
}
static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
{
ssize_t nbytes;
char *buf;
if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
/*
* If there is just a single buffer, and it is properly aligned
* we can just use plain pread/pwrite without any problems.
*/
if (aiocb->aio_niov == 1) {
return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
}
/*
* We have more than one iovec, and all are properly aligned.
*
* Try preadv/pwritev first and fall back to linearizing the
* buffer if it's not supported.
*/
if (preadv_present) {
nbytes = handle_aiocb_rw_vector(aiocb);
if (nbytes == aiocb->aio_nbytes ||
(nbytes < 0 && nbytes != -ENOSYS)) {
return nbytes;
}
preadv_present = false;
}
/*
* XXX(hch): short read/write. no easy way to handle the reminder
* using these interfaces. For now retry using plain
* pread/pwrite?
*/
}
/*
* Ok, we have to do it the hard way, copy all segments into
* a single aligned buffer.
*/
buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes);
if (buf == NULL) {
return -ENOMEM;
}
if (aiocb->aio_type & QEMU_AIO_WRITE) {
char *p = buf;
int i;
for (i = 0; i < aiocb->aio_niov; ++i) {
memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
p += aiocb->aio_iov[i].iov_len;
}
assert(p - buf == aiocb->aio_nbytes);
}
nbytes = handle_aiocb_rw_linear(aiocb, buf);
if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
char *p = buf;
size_t count = aiocb->aio_nbytes, copy;
int i;
for (i = 0; i < aiocb->aio_niov && count; ++i) {
copy = count;
if (copy > aiocb->aio_iov[i].iov_len) {
copy = aiocb->aio_iov[i].iov_len;
}
memcpy(aiocb->aio_iov[i].iov_base, p, copy);
assert(count >= copy);
p += copy;
count -= copy;
}
assert(count == 0);
}
qemu_vfree(buf);
return nbytes;
}
#ifdef CONFIG_XFS
static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
{
struct xfs_flock64 fl;
memset(&fl, 0, sizeof(fl));
fl.l_whence = SEEK_SET;
fl.l_start = offset;
fl.l_len = bytes;
if (xfsctl(NULL, s->fd, XFS_IOC_ZERO_RANGE, &fl) < 0) {
DEBUG_BLOCK_PRINT("cannot write zero range (%s)\n", strerror(errno));
return -errno;
}
return 0;
}
static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
{
struct xfs_flock64 fl;
memset(&fl, 0, sizeof(fl));
fl.l_whence = SEEK_SET;
fl.l_start = offset;
fl.l_len = bytes;
if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
DEBUG_BLOCK_PRINT("cannot punch hole (%s)\n", strerror(errno));
return -errno;
}
return 0;
}
#endif
static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
{
int ret = -EOPNOTSUPP;
BDRVRawState *s = aiocb->bs->opaque;
if (s->has_write_zeroes == 0) {
return -ENOTSUP;
}
if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
#ifdef BLKZEROOUT
do {
uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) {
return 0;
}
} while (errno == EINTR);
ret = -errno;
#endif
} else {
#ifdef CONFIG_XFS
if (s->is_xfs) {
return xfs_write_zeroes(s, aiocb->aio_offset, aiocb->aio_nbytes);
}
#endif
}
if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
ret == -ENOTTY) {
s->has_write_zeroes = false;
ret = -ENOTSUP;
}
return ret;
}
static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
{
int ret = -EOPNOTSUPP;
BDRVRawState *s = aiocb->bs->opaque;
if (!s->has_discard) {
return -ENOTSUP;
}
if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
#ifdef BLKDISCARD
do {
uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) {
return 0;
}
} while (errno == EINTR);
ret = -errno;
#endif
} else {
#ifdef CONFIG_XFS
if (s->is_xfs) {
return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes);
}
#endif
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
do {
if (fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
aiocb->aio_offset, aiocb->aio_nbytes) == 0) {
return 0;
}
} while (errno == EINTR);
ret = -errno;
#endif
}
if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
ret == -ENOTTY) {
s->has_discard = false;
ret = -ENOTSUP;
}
return ret;
}
static int aio_worker(void *arg)
{
RawPosixAIOData *aiocb = arg;
ssize_t ret = 0;
switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
case QEMU_AIO_READ:
ret = handle_aiocb_rw(aiocb);
if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->bs->growable) {
iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
0, aiocb->aio_nbytes - ret);
ret = aiocb->aio_nbytes;
}
if (ret == aiocb->aio_nbytes) {
ret = 0;
} else if (ret >= 0 && ret < aiocb->aio_nbytes) {
ret = -EINVAL;
}
break;
case QEMU_AIO_WRITE:
ret = handle_aiocb_rw(aiocb);
if (ret == aiocb->aio_nbytes) {
ret = 0;
} else if (ret >= 0 && ret < aiocb->aio_nbytes) {
ret = -EINVAL;
}
break;
case QEMU_AIO_FLUSH:
ret = handle_aiocb_flush(aiocb);
break;
case QEMU_AIO_IOCTL:
ret = handle_aiocb_ioctl(aiocb);
break;
case QEMU_AIO_DISCARD:
ret = handle_aiocb_discard(aiocb);
break;
case QEMU_AIO_WRITE_ZEROES:
ret = handle_aiocb_write_zeroes(aiocb);
break;
default:
fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
ret = -EINVAL;
break;
}
g_slice_free(RawPosixAIOData, aiocb);
return ret;
}
static int paio_submit_co(BlockDriverState *bs, int fd,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
int type)
{
RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
ThreadPool *pool;
acb->bs = bs;
acb->aio_type = type;
acb->aio_fildes = fd;
acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
if (qiov) {
acb->aio_iov = qiov->iov;
acb->aio_niov = qiov->niov;
assert(qiov->size == acb->aio_nbytes);
}
trace_paio_submit_co(sector_num, nb_sectors, type);
pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
return thread_pool_submit_co(pool, aio_worker, acb);
}
static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque, int type)
{
RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
ThreadPool *pool;
acb->bs = bs;
acb->aio_type = type;
acb->aio_fildes = fd;
acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
if (qiov) {
acb->aio_iov = qiov->iov;
acb->aio_niov = qiov->niov;
assert(qiov->size == acb->aio_nbytes);
}
trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
}
static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque, int type)
{
BDRVRawState *s = bs->opaque;
if (fd_open(bs) < 0)
return NULL;
/*
* If O_DIRECT is used the buffer needs to be aligned on a sector
* boundary. Check if this is the case or tell the low-level
* driver that it needs to copy the buffer.
*/
if ((bs->open_flags & BDRV_O_NOCACHE)) {
if (!bdrv_qiov_is_aligned(bs, qiov)) {
type |= QEMU_AIO_MISALIGNED;
#ifdef CONFIG_LINUX_AIO
} else if (s->use_aio) {
return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
nb_sectors, cb, opaque, type);
#endif
}
}
return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
cb, opaque, type);
}
static void raw_aio_plug(BlockDriverState *bs)
{
#ifdef CONFIG_LINUX_AIO
BDRVRawState *s = bs->opaque;
if (s->use_aio) {
laio_io_plug(bs, s->aio_ctx);
}
#endif
}
static void raw_aio_unplug(BlockDriverState *bs)
{
#ifdef CONFIG_LINUX_AIO
BDRVRawState *s = bs->opaque;
if (s->use_aio) {
laio_io_unplug(bs, s->aio_ctx, true);
}
#endif
}
static void raw_aio_flush_io_queue(BlockDriverState *bs)
{
#ifdef CONFIG_LINUX_AIO
BDRVRawState *s = bs->opaque;
if (s->use_aio) {
laio_io_unplug(bs, s->aio_ctx, false);
}
#endif
}
static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
cb, opaque, QEMU_AIO_READ);
}
static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
cb, opaque, QEMU_AIO_WRITE);
}
static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVRawState *s = bs->opaque;
if (fd_open(bs) < 0)
return NULL;
return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
}
static void raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
raw_detach_aio_context(bs);
#ifdef CONFIG_LINUX_AIO
if (s->use_aio) {
laio_cleanup(s->aio_ctx);
}
#endif
if (s->fd >= 0) {
qemu_close(s->fd);
s->fd = -1;
}
}
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVRawState *s = bs->opaque;
struct stat st;
if (fstat(s->fd, &st)) {
return -errno;
}
if (S_ISREG(st.st_mode)) {
if (ftruncate(s->fd, offset) < 0) {
return -errno;
}
} else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
if (offset > raw_getlength(bs)) {
return -EINVAL;
}
} else {
return -ENOTSUP;
}
return 0;
}
#ifdef __OpenBSD__
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd = s->fd;
struct stat st;
if (fstat(fd, &st))
return -errno;
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
struct disklabel dl;
if (ioctl(fd, DIOCGDINFO, &dl))
return -errno;
return (uint64_t)dl.d_secsize *
dl.d_partitions[DISKPART(st.st_rdev)].p_size;
} else
return st.st_size;
}
#elif defined(__NetBSD__)
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd = s->fd;
struct stat st;
if (fstat(fd, &st))
return -errno;
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
struct dkwedge_info dkw;
if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
return dkw.dkw_size * 512;
} else {
struct disklabel dl;
if (ioctl(fd, DIOCGDINFO, &dl))
return -errno;
return (uint64_t)dl.d_secsize *
dl.d_partitions[DISKPART(st.st_rdev)].p_size;
}
} else
return st.st_size;
}
#elif defined(__sun__)
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
struct dk_minfo minfo;
int ret;
int64_t size;
ret = fd_open(bs);
if (ret < 0) {
return ret;
}
/*
* Use the DKIOCGMEDIAINFO ioctl to read the size.
*/
ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
if (ret != -1) {
return minfo.dki_lbsize * minfo.dki_capacity;
}
/*
* There are reports that lseek on some devices fails, but
* irc discussion said that contingency on contingency was overkill.
*/
size = lseek(s->fd, 0, SEEK_END);
if (size < 0) {
return -errno;
}
return size;
}
#elif defined(CONFIG_BSD)
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd = s->fd;
int64_t size;
struct stat sb;
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
int reopened = 0;
#endif
int ret;
ret = fd_open(bs);
if (ret < 0)
return ret;
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
again:
#endif
if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
#ifdef DIOCGMEDIASIZE
if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
#elif defined(DIOCGPART)
{
struct partinfo pi;
if (ioctl(fd, DIOCGPART, &pi) == 0)
size = pi.media_size;
else
size = 0;
}
if (size == 0)
#endif
#if defined(__APPLE__) && defined(__MACH__)
size = LLONG_MAX;
#else
size = lseek(fd, 0LL, SEEK_END);
if (size < 0) {
return -errno;
}
#endif
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
switch(s->type) {
case FTYPE_CD:
/* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
if (size == 2048LL * (unsigned)-1)
size = 0;
/* XXX no disc? maybe we need to reopen... */
if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
reopened = 1;
goto again;
}
}
#endif
} else {
size = lseek(fd, 0, SEEK_END);
if (size < 0) {
return -errno;
}
}
return size;
}
#else
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int ret;
int64_t size;
ret = fd_open(bs);
if (ret < 0) {
return ret;
}
size = lseek(s->fd, 0, SEEK_END);
if (size < 0) {
return -errno;
}
return size;
}
#endif
static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
{
struct stat st;
BDRVRawState *s = bs->opaque;
if (fstat(s->fd, &st) < 0) {
return -errno;
}
return (int64_t)st.st_blocks * 512;
}
static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
{
int fd;
int result = 0;
int64_t total_size = 0;
bool nocow = false;
PreallocMode prealloc;
char *buf = NULL;
Error *local_err = NULL;
strstart(filename, "file:", &filename);
/* Read out options */
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false);
buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
PREALLOC_MODE_MAX, PREALLOC_MODE_OFF,
&local_err);
g_free(buf);
if (local_err) {
error_propagate(errp, local_err);
result = -EINVAL;
goto out;
}
fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
0644);
if (fd < 0) {
result = -errno;
error_setg_errno(errp, -result, "Could not create file");
goto out;
}
if (nocow) {
#ifdef __linux__
/* Set NOCOW flag to solve performance issue on fs like btrfs.
* This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
* will be ignored since any failure of this operation should not
* block the left work.
*/
int attr;
if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) {
attr |= FS_NOCOW_FL;
ioctl(fd, FS_IOC_SETFLAGS, &attr);
}
#endif
}
if (ftruncate(fd, total_size) != 0) {
result = -errno;
error_setg_errno(errp, -result, "Could not resize file");
goto out_close;
}
switch (prealloc) {
#ifdef CONFIG_POSIX_FALLOCATE
case PREALLOC_MODE_FALLOC:
/* posix_fallocate() doesn't set errno. */
result = -posix_fallocate(fd, 0, total_size);
if (result != 0) {
error_setg_errno(errp, -result,
"Could not preallocate data for the new file");
}
break;
#endif
case PREALLOC_MODE_FULL:
{
int64_t num = 0, left = total_size;
buf = g_malloc0(65536);
while (left > 0) {
num = MIN(left, 65536);
result = write(fd, buf, num);
if (result < 0) {
result = -errno;
error_setg_errno(errp, -result,
"Could not write to the new file");
break;
}
left -= num;
}
fsync(fd);
g_free(buf);
break;
}
case PREALLOC_MODE_OFF:
break;
default:
result = -EINVAL;
error_setg(errp, "Unsupported preallocation mode: %s",
PreallocMode_lookup[prealloc]);
break;
}
out_close:
if (qemu_close(fd) != 0 && result == 0) {
result = -errno;
error_setg_errno(errp, -result, "Could not close the new file");
}
out:
return result;
}
static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
off_t *hole, int nb_sectors, int *pnum)
{
#ifdef CONFIG_FIEMAP
BDRVRawState *s = bs->opaque;
int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
struct {
struct fiemap fm;
struct fiemap_extent fe;
} f;
if (s->skip_fiemap) {
return -ENOTSUP;
}
f.fm.fm_start = start;
f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
f.fm.fm_flags = 0;
f.fm.fm_extent_count = 1;
f.fm.fm_reserved = 0;
if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {
s->skip_fiemap = true;
return -errno;
}
if (f.fm.fm_mapped_extents == 0) {
/* No extents found, data is beyond f.fm.fm_start + f.fm.fm_length.
* f.fm.fm_start + f.fm.fm_length must be clamped to the file size!
*/
off_t length = lseek(s->fd, 0, SEEK_END);
*hole = f.fm.fm_start;
*data = MIN(f.fm.fm_start + f.fm.fm_length, length);
} else {
*data = f.fe.fe_logical;
*hole = f.fe.fe_logical + f.fe.fe_length;
if (f.fe.fe_flags & FIEMAP_EXTENT_UNWRITTEN) {
ret |= BDRV_BLOCK_ZERO;
}
}
return ret;
#else
return -ENOTSUP;
#endif
}
static int64_t try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
off_t *hole, int *pnum)
{
#if defined SEEK_HOLE && defined SEEK_DATA
BDRVRawState *s = bs->opaque;
*hole = lseek(s->fd, start, SEEK_HOLE);
if (*hole == -1) {
/* -ENXIO indicates that sector_num was past the end of the file.
* There is a virtual hole there. */
assert(errno != -ENXIO);
return -errno;
}
if (*hole > start) {
*data = start;
} else {
/* On a hole. We need another syscall to find its end. */
*data = lseek(s->fd, start, SEEK_DATA);
if (*data == -1) {
*data = lseek(s->fd, 0, SEEK_END);
}
}
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
#else
return -ENOTSUP;
#endif
}
/*
* Returns true iff the specified sector is present in the disk image. Drivers
* not implementing the functionality are assumed to not support backing files,
* hence all their sectors are reported as allocated.
*
* If 'sector_num' is beyond the end of the disk image the return value is 0
* and 'pnum' is set to 0.
*
* 'pnum' is set to the number of sectors (including and immediately following
* the specified sector) that are known to be in the same
* allocated/unallocated state.
*
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
* beyond the end of the disk image it will be clamped.
*/
static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum)
{
off_t start, data = 0, hole = 0;
int64_t ret;
ret = fd_open(bs);
if (ret < 0) {
return ret;
}
start = sector_num * BDRV_SECTOR_SIZE;
ret = try_fiemap(bs, start, &data, &hole, nb_sectors, pnum);
if (ret < 0) {
ret = try_seek_hole(bs, start, &data, &hole, pnum);
if (ret < 0) {
/* Assume everything is allocated. */
data = 0;
hole = start + nb_sectors * BDRV_SECTOR_SIZE;
ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
}
}
if (data <= start) {
/* On a data extent, compute sectors to the end of the extent. */
*pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
} else {
/* On a hole, compute sectors to the beginning of the next extent. */
*pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
ret &= ~BDRV_BLOCK_DATA;
ret |= BDRV_BLOCK_ZERO;
}
return ret;
}
static coroutine_fn BlockDriverAIOCB *raw_aio_discard(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVRawState *s = bs->opaque;
return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
cb, opaque, QEMU_AIO_DISCARD);
}
static int coroutine_fn raw_co_write_zeroes(
BlockDriverState *bs, int64_t sector_num,
int nb_sectors, BdrvRequestFlags flags)
{
BDRVRawState *s = bs->opaque;
if (!(flags & BDRV_REQ_MAY_UNMAP)) {
return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
QEMU_AIO_WRITE_ZEROES);
} else if (s->discard_zeroes) {
return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
QEMU_AIO_DISCARD);
}
return -ENOTSUP;
}
static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
BDRVRawState *s = bs->opaque;
bdi->unallocated_blocks_are_zero = s->discard_zeroes;
bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
return 0;
}
static QemuOptsList raw_create_opts = {
.name = "raw-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
.desc = {
{
.name = BLOCK_OPT_SIZE,
.type = QEMU_OPT_SIZE,
.help = "Virtual disk size"
},
{
.name = BLOCK_OPT_NOCOW,
.type = QEMU_OPT_BOOL,
.help = "Turn off copy-on-write (valid only on btrfs)"
},
{
.name = BLOCK_OPT_PREALLOC,
.type = QEMU_OPT_STRING,
.help = "Preallocation mode (allowed values: off, falloc, full)"
},
{ /* end of list */ }
}
};
static BlockDriver bdrv_file = {
.format_name = "file",
.protocol_name = "file",
.instance_size = sizeof(BDRVRawState),
.bdrv_needs_filename = true,
.bdrv_probe = NULL, /* no probe for protocols */
.bdrv_parse_filename = raw_parse_filename,
.bdrv_file_open = raw_open,
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_get_block_status = raw_co_get_block_status,
.bdrv_co_write_zeroes = raw_co_write_zeroes,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_aio_discard = raw_aio_discard,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_io_plug = raw_aio_plug,
.bdrv_io_unplug = raw_aio_unplug,
.bdrv_flush_io_queue = raw_aio_flush_io_queue,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_info = raw_get_info,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
.bdrv_detach_aio_context = raw_detach_aio_context,
.bdrv_attach_aio_context = raw_attach_aio_context,
.create_opts = &raw_create_opts,
};
/***********************************************/
/* host device */
#if defined(__APPLE__) && defined(__MACH__)
static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
{
kern_return_t kernResult;
mach_port_t masterPort;
CFMutableDictionaryRef classesToMatch;
kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
if ( KERN_SUCCESS != kernResult ) {
printf( "IOMasterPort returned %d\n", kernResult );
}
classesToMatch = IOServiceMatching( kIOCDMediaClass );
if ( classesToMatch == NULL ) {
printf( "IOServiceMatching returned a NULL dictionary.\n" );
} else {
CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
}
kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
if ( KERN_SUCCESS != kernResult )
{
printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
}
return kernResult;
}
kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
{
io_object_t nextMedia;
kern_return_t kernResult = KERN_FAILURE;
*bsdPath = '\0';
nextMedia = IOIteratorNext( mediaIterator );
if ( nextMedia )
{
CFTypeRef bsdPathAsCFString;
bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
if ( bsdPathAsCFString ) {
size_t devPathLength;
strcpy( bsdPath, _PATH_DEV );
strcat( bsdPath, "r" );
devPathLength = strlen( bsdPath );
if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
kernResult = KERN_SUCCESS;
}
CFRelease( bsdPathAsCFString );
}
IOObjectRelease( nextMedia );
}
return kernResult;
}
#endif
static int hdev_probe_device(const char *filename)
{
struct stat st;
/* allow a dedicated CD-ROM driver to match with a higher priority */
if (strstart(filename, "/dev/cdrom", NULL))
return 50;
if (stat(filename, &st) >= 0 &&
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
return 100;
}
return 0;
}
static int check_hdev_writable(BDRVRawState *s)
{
#if defined(BLKROGET)
/* Linux block devices can be configured "read-only" using blockdev(8).
* This is independent of device node permissions and therefore open(2)
* with O_RDWR succeeds. Actual writes fail with EPERM.
*
* bdrv_open() is supposed to fail if the disk is read-only. Explicitly
* check for read-only block devices so that Linux block devices behave
* properly.
*/
struct stat st;
int readonly = 0;
if (fstat(s->fd, &st)) {
return -errno;
}
if (!S_ISBLK(st.st_mode)) {
return 0;
}
if (ioctl(s->fd, BLKROGET, &readonly) < 0) {
return -errno;
}
if (readonly) {
return -EACCES;
}
#endif /* defined(BLKROGET) */
return 0;
}
static void hdev_parse_filename(const char *filename, QDict *options,
Error **errp)
{
/* The prefix is optional, just as for "file". */
strstart(filename, "host_device:", &filename);
qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
}
static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVRawState *s = bs->opaque;
Error *local_err = NULL;
int ret;
const char *filename = qdict_get_str(options, "filename");
#if defined(__APPLE__) && defined(__MACH__)
if (strstart(filename, "/dev/cdrom", NULL)) {
kern_return_t kernResult;
io_iterator_t mediaIterator;
char bsdPath[ MAXPATHLEN ];
int fd;
kernResult = FindEjectableCDMedia( &mediaIterator );
kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
if ( bsdPath[ 0 ] != '\0' ) {
strcat(bsdPath,"s0");
/* some CDs don't have a partition 0 */
fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0) {
bsdPath[strlen(bsdPath)-1] = '1';
} else {
qemu_close(fd);
}
filename = bsdPath;
qdict_put(options, "filename", qstring_from_str(filename));
}
if ( mediaIterator )
IOObjectRelease( mediaIterator );
}
#endif
s->type = FTYPE_FILE;
#if defined(__linux__)
{
char resolved_path[ MAXPATHLEN ], *temp;
temp = realpath(filename, resolved_path);
if (temp && strstart(temp, "/dev/sg", NULL)) {
bs->sg = 1;
}
}
#endif
ret = raw_open_common(bs, options, flags, 0, &local_err);
if (ret < 0) {
if (local_err) {
error_propagate(errp, local_err);
}
return ret;
}
if (flags & BDRV_O_RDWR) {
ret = check_hdev_writable(s);
if (ret < 0) {
raw_close(bs);
error_setg_errno(errp, -ret, "The device is not writable");
return ret;
}
}
return ret;
}
#if defined(__linux__)
/* Note: we do not have a reliable method to detect if the floppy is
present. The current method is to try to open the floppy at every
I/O and to keep it opened during a few hundreds of ms. */
static int fd_open(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int last_media_present;
if (s->type != FTYPE_FD)
return 0;
last_media_present = (s->fd >= 0);
if (s->fd >= 0 &&
(get_clock() - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
qemu_close(s->fd);
s->fd = -1;
#ifdef DEBUG_FLOPPY
printf("Floppy closed\n");
#endif
}
if (s->fd < 0) {
if (s->fd_got_error &&
(get_clock() - s->fd_error_time) < FD_OPEN_TIMEOUT) {
#ifdef DEBUG_FLOPPY
printf("No floppy (open delayed)\n");
#endif
return -EIO;
}
s->fd = qemu_open(bs->filename, s->open_flags & ~O_NONBLOCK);
if (s->fd < 0) {
s->fd_error_time = get_clock();
s->fd_got_error = 1;
if (last_media_present)
s->fd_media_changed = 1;
#ifdef DEBUG_FLOPPY
printf("No floppy\n");
#endif
return -EIO;
}
#ifdef DEBUG_FLOPPY
printf("Floppy opened\n");
#endif
}
if (!last_media_present)
s->fd_media_changed = 1;
s->fd_open_time = get_clock();
s->fd_got_error = 0;
return 0;
}
static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
BDRVRawState *s = bs->opaque;
return ioctl(s->fd, req, buf);
}
static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVRawState *s = bs->opaque;
RawPosixAIOData *acb;
ThreadPool *pool;
if (fd_open(bs) < 0)
return NULL;
acb = g_slice_new(RawPosixAIOData);
acb->bs = bs;
acb->aio_type = QEMU_AIO_IOCTL;
acb->aio_fildes = s->fd;
acb->aio_offset = 0;
acb->aio_ioctl_buf = buf;
acb->aio_ioctl_cmd = req;
pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
}
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
static int fd_open(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
/* this is just to ensure s->fd is sane (its called by io ops) */
if (s->fd >= 0)
return 0;
return -EIO;
}
#else /* !linux && !FreeBSD */
static int fd_open(BlockDriverState *bs)
{
return 0;
}
#endif /* !linux && !FreeBSD */
static coroutine_fn BlockDriverAIOCB *hdev_aio_discard(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVRawState *s = bs->opaque;
if (fd_open(bs) < 0) {
return NULL;
}
return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
}
static coroutine_fn int hdev_co_write_zeroes(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
{
BDRVRawState *s = bs->opaque;
int rc;
rc = fd_open(bs);
if (rc < 0) {
return rc;
}
if (!(flags & BDRV_REQ_MAY_UNMAP)) {
return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
QEMU_AIO_WRITE_ZEROES|QEMU_AIO_BLKDEV);
} else if (s->discard_zeroes) {
return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
}
return -ENOTSUP;
}
static int hdev_create(const char *filename, QemuOpts *opts,
Error **errp)
{
int fd;
int ret = 0;
struct stat stat_buf;
int64_t total_size = 0;
bool has_prefix;
/* This function is used by all three protocol block drivers and therefore
* any of these three prefixes may be given.
* The return value has to be stored somewhere, otherwise this is an error
* due to -Werror=unused-value. */
has_prefix =
strstart(filename, "host_device:", &filename) ||
strstart(filename, "host_cdrom:" , &filename) ||
strstart(filename, "host_floppy:", &filename);
(void)has_prefix;
/* Read out options */
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
fd = qemu_open(filename, O_WRONLY | O_BINARY);
if (fd < 0) {
ret = -errno;
error_setg_errno(errp, -ret, "Could not open device");
return ret;
}
if (fstat(fd, &stat_buf) < 0) {
ret = -errno;
error_setg_errno(errp, -ret, "Could not stat device");
} else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) {
error_setg(errp,
"The given file is neither a block nor a character device");
ret = -ENODEV;
} else if (lseek(fd, 0, SEEK_END) < total_size) {
error_setg(errp, "Device is too small");
ret = -ENOSPC;
}
qemu_close(fd);
return ret;
}
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.protocol_name = "host_device",
.instance_size = sizeof(BDRVRawState),
.bdrv_needs_filename = true,
.bdrv_probe_device = hdev_probe_device,
.bdrv_parse_filename = hdev_parse_filename,
.bdrv_file_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_opts = &raw_create_opts,
.bdrv_co_write_zeroes = hdev_co_write_zeroes,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_aio_discard = hdev_aio_discard,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_io_plug = raw_aio_plug,
.bdrv_io_unplug = raw_aio_unplug,
.bdrv_flush_io_queue = raw_aio_flush_io_queue,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_info = raw_get_info,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
.bdrv_detach_aio_context = raw_detach_aio_context,
.bdrv_attach_aio_context = raw_attach_aio_context,
/* generic scsi device */
#ifdef __linux__
.bdrv_ioctl = hdev_ioctl,
.bdrv_aio_ioctl = hdev_aio_ioctl,
#endif
};
#ifdef __linux__
static void floppy_parse_filename(const char *filename, QDict *options,
Error **errp)
{
/* The prefix is optional, just as for "file". */
strstart(filename, "host_floppy:", &filename);
qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
}
static int floppy_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVRawState *s = bs->opaque;
Error *local_err = NULL;
int ret;
s->type = FTYPE_FD;
/* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
if (ret) {
if (local_err) {
error_propagate(errp, local_err);
}
return ret;
}
/* close fd so that we can reopen it as needed */
qemu_close(s->fd);
s->fd = -1;
s->fd_media_changed = 1;
return 0;
}
static int floppy_probe_device(const char *filename)
{
int fd, ret;
int prio = 0;
struct floppy_struct fdparam;
struct stat st;
if (strstart(filename, "/dev/fd", NULL) &&
!strstart(filename, "/dev/fdset/", NULL)) {
prio = 50;
}
fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
goto out;
}
ret = fstat(fd, &st);
if (ret == -1 || !S_ISBLK(st.st_mode)) {
goto outc;
}
/* Attempt to detect via a floppy specific ioctl */
ret = ioctl(fd, FDGETPRM, &fdparam);
if (ret >= 0)
prio = 100;
outc:
qemu_close(fd);
out:
return prio;
}
static int floppy_is_inserted(BlockDriverState *bs)
{
return fd_open(bs) >= 0;
}
static int floppy_media_changed(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int ret;
/*
* XXX: we do not have a true media changed indication.
* It does not work if the floppy is changed without trying to read it.
*/
fd_open(bs);
ret = s->fd_media_changed;
s->fd_media_changed = 0;
#ifdef DEBUG_FLOPPY
printf("Floppy changed=%d\n", ret);
#endif
return ret;
}
static void floppy_eject(BlockDriverState *bs, bool eject_flag)
{
BDRVRawState *s = bs->opaque;
int fd;
if (s->fd >= 0) {
qemu_close(s->fd);
s->fd = -1;
}
fd = qemu_open(bs->filename, s->open_flags | O_NONBLOCK);
if (fd >= 0) {
if (ioctl(fd, FDEJECT, 0) < 0)
perror("FDEJECT");
qemu_close(fd);
}
}
static BlockDriver bdrv_host_floppy = {
.format_name = "host_floppy",
.protocol_name = "host_floppy",
.instance_size = sizeof(BDRVRawState),
.bdrv_needs_filename = true,
.bdrv_probe_device = floppy_probe_device,
.bdrv_parse_filename = floppy_parse_filename,
.bdrv_file_open = floppy_open,
.bdrv_close = raw_close,
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_opts = &raw_create_opts,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_io_plug = raw_aio_plug,
.bdrv_io_unplug = raw_aio_unplug,
.bdrv_flush_io_queue = raw_aio_flush_io_queue,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.has_variable_length = true,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
.bdrv_detach_aio_context = raw_detach_aio_context,
.bdrv_attach_aio_context = raw_attach_aio_context,
/* removable device support */
.bdrv_is_inserted = floppy_is_inserted,
.bdrv_media_changed = floppy_media_changed,
.bdrv_eject = floppy_eject,
};
#endif
#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
static void cdrom_parse_filename(const char *filename, QDict *options,
Error **errp)
{
/* The prefix is optional, just as for "file". */
strstart(filename, "host_cdrom:", &filename);
qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
}
#endif
#ifdef __linux__
static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVRawState *s = bs->opaque;
Error *local_err = NULL;
int ret;
s->type = FTYPE_CD;
/* open will not fail even if no CD is inserted, so add O_NONBLOCK */
ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
if (local_err) {
error_propagate(errp, local_err);
}
return ret;
}
static int cdrom_probe_device(const char *filename)
{
int fd, ret;
int prio = 0;
struct stat st;
fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
goto out;
}
ret = fstat(fd, &st);
if (ret == -1 || !S_ISBLK(st.st_mode)) {
goto outc;
}
/* Attempt to detect via a CDROM specific ioctl */
ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (ret >= 0)
prio = 100;
outc:
qemu_close(fd);
out:
return prio;
}
static int cdrom_is_inserted(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int ret;
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (ret == CDS_DISC_OK)
return 1;
return 0;
}
static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
{
BDRVRawState *s = bs->opaque;
if (eject_flag) {
if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
perror("CDROMEJECT");
} else {
if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
perror("CDROMEJECT");
}
}
static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
{
BDRVRawState *s = bs->opaque;
if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
/*
* Note: an error can happen if the distribution automatically
* mounts the CD-ROM
*/
/* perror("CDROM_LOCKDOOR"); */
}
}
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.protocol_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_needs_filename = true,
.bdrv_probe_device = cdrom_probe_device,
.bdrv_parse_filename = cdrom_parse_filename,
.bdrv_file_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_opts = &raw_create_opts,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_io_plug = raw_aio_plug,
.bdrv_io_unplug = raw_aio_unplug,
.bdrv_flush_io_queue = raw_aio_flush_io_queue,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.has_variable_length = true,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
.bdrv_detach_aio_context = raw_detach_aio_context,
.bdrv_attach_aio_context = raw_attach_aio_context,
/* removable device support */
.bdrv_is_inserted = cdrom_is_inserted,
.bdrv_eject = cdrom_eject,
.bdrv_lock_medium = cdrom_lock_medium,
/* generic scsi device */
.bdrv_ioctl = hdev_ioctl,
.bdrv_aio_ioctl = hdev_aio_ioctl,
};
#endif /* __linux__ */
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVRawState *s = bs->opaque;
Error *local_err = NULL;
int ret;
s->type = FTYPE_CD;
ret = raw_open_common(bs, options, flags, 0, &local_err);
if (ret) {
if (local_err) {
error_propagate(errp, local_err);
}
return ret;
}
/* make sure the door isn't locked at this time */
ioctl(s->fd, CDIOCALLOW);
return 0;
}
static int cdrom_probe_device(const char *filename)
{
if (strstart(filename, "/dev/cd", NULL) ||
strstart(filename, "/dev/acd", NULL))
return 100;
return 0;
}
static int cdrom_reopen(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd;
/*
* Force reread of possibly changed/newly loaded disc,
* FreeBSD seems to not notice sometimes...
*/
if (s->fd >= 0)
qemu_close(s->fd);
fd = qemu_open(bs->filename, s->open_flags, 0644);
if (fd < 0) {
s->fd = -1;
return -EIO;
}
s->fd = fd;
/* make sure the door isn't locked at this time */
ioctl(s->fd, CDIOCALLOW);
return 0;
}
static int cdrom_is_inserted(BlockDriverState *bs)
{
return raw_getlength(bs) > 0;
}
static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
{
BDRVRawState *s = bs->opaque;
if (s->fd < 0)
return;
(void) ioctl(s->fd, CDIOCALLOW);
if (eject_flag) {
if (ioctl(s->fd, CDIOCEJECT) < 0)
perror("CDIOCEJECT");
} else {
if (ioctl(s->fd, CDIOCCLOSE) < 0)
perror("CDIOCCLOSE");
}
cdrom_reopen(bs);
}
static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
{
BDRVRawState *s = bs->opaque;
if (s->fd < 0)
return;
if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
/*
* Note: an error can happen if the distribution automatically
* mounts the CD-ROM
*/
/* perror("CDROM_LOCKDOOR"); */
}
}
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.protocol_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_needs_filename = true,
.bdrv_probe_device = cdrom_probe_device,
.bdrv_parse_filename = cdrom_parse_filename,
.bdrv_file_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_opts = &raw_create_opts,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_io_plug = raw_aio_plug,
.bdrv_io_unplug = raw_aio_unplug,
.bdrv_flush_io_queue = raw_aio_flush_io_queue,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.has_variable_length = true,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
.bdrv_detach_aio_context = raw_detach_aio_context,
.bdrv_attach_aio_context = raw_attach_aio_context,
/* removable device support */
.bdrv_is_inserted = cdrom_is_inserted,
.bdrv_eject = cdrom_eject,
.bdrv_lock_medium = cdrom_lock_medium,
};
#endif /* __FreeBSD__ */
static void bdrv_file_init(void)
{
/*
* Register all the drivers. Note that order is important, the driver
* registered last will get probed first.
*/
bdrv_register(&bdrv_file);
bdrv_register(&bdrv_host_device);
#ifdef __linux__
bdrv_register(&bdrv_host_floppy);
bdrv_register(&bdrv_host_cdrom);
#endif
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
bdrv_register(&bdrv_host_cdrom);
#endif
}
block_init(bdrv_file_init);
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