Hot unplugging -drive aio=native,file=test.img,format=raw images leaves the Linux AIO event notifier and struct qemu_laio_state allocated. Luckily nothing will use the event notifier after the BlockDriverState has been closed so the handler function is never called. It's still worth fixing this resource leak. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2386 lines
62 KiB
C
2386 lines
62 KiB
C
/*
|
|
* Block driver for RAW files (posix)
|
|
*
|
|
* Copyright (c) 2006 Fabrice Bellard
|
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*
|
|
* 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
|
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* all copies or substantial portions of the Software.
|
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*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
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* 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"
|
|
|
|
#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>
|
|
#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)
|
|
{
|
|
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;
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|
|
|
#ifdef BLKSSZGET
|
|
if (ioctl(s->fd, BLKSSZGET, §or_size) >= 0) {
|
|
bs->request_alignment = sector_size;
|
|
}
|
|
#endif
|
|
#ifdef DKIOCGETBLOCKSIZE
|
|
if (ioctl(s->fd, DKIOCGETBLOCKSIZE, §or_size) >= 0) {
|
|
bs->request_alignment = sector_size;
|
|
}
|
|
#endif
|
|
#ifdef DIOCGSECTORSIZE
|
|
if (ioctl(s->fd, DIOCGSECTORSIZE, §or_size) >= 0) {
|
|
bs->request_alignment = sector_size;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_XFS
|
|
if (s->is_xfs) {
|
|
struct dioattr da;
|
|
if (xfsctl(NULL, s->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(s->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(s->fd, buf, align, 0) >= 0) {
|
|
bs->request_alignment = align;
|
|
break;
|
|
}
|
|
}
|
|
qemu_vfree(buf);
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
assert(state != NULL);
|
|
assert(state->bs != NULL);
|
|
|
|
s = state->bs->opaque;
|
|
|
|
state->opaque = g_malloc0(sizeof(BDRVRawReopenState));
|
|
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;
|
|
}
|
|
}
|
|
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 int raw_refresh_limits(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
raw_probe_alignment(bs);
|
|
bs->bl.opt_mem_alignment = s->buf_align;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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) {
|
|
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_blockalign(aiocb->bs, aiocb->aio_nbytes);
|
|
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;
|
|
}
|
|
}
|
|
|
|
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);
|
|
p += copy;
|
|
count -= copy;
|
|
}
|
|
}
|
|
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;
|
|
|
|
if (qiov) {
|
|
acb->aio_iov = qiov->iov;
|
|
acb->aio_niov = qiov->niov;
|
|
}
|
|
acb->aio_nbytes = nb_sectors * 512;
|
|
acb->aio_offset = sector_num * 512;
|
|
|
|
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;
|
|
|
|
if (qiov) {
|
|
acb->aio_iov = qiov->iov;
|
|
acb->aio_niov = qiov->niov;
|
|
}
|
|
acb->aio_nbytes = nb_sectors * 512;
|
|
acb->aio_offset = sector_num * 512;
|
|
|
|
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 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 -1;
|
|
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
struct disklabel dl;
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dl))
|
|
return -1;
|
|
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 -1;
|
|
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 -1;
|
|
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;
|
|
|
|
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.
|
|
*/
|
|
return lseek(s->fd, 0, SEEK_END);
|
|
}
|
|
#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);
|
|
#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);
|
|
}
|
|
return size;
|
|
}
|
|
#else
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return lseek(s->fd, 0, SEEK_END);
|
|
}
|
|
#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, QEMUOptionParameter *options,
|
|
Error **errp)
|
|
{
|
|
int fd;
|
|
int result = 0;
|
|
int64_t total_size = 0;
|
|
|
|
strstart(filename, "file:", &filename);
|
|
|
|
/* Read out options */
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
|
total_size = options->value.n / BDRV_SECTOR_SIZE;
|
|
}
|
|
options++;
|
|
}
|
|
|
|
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");
|
|
} else {
|
|
if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not resize file");
|
|
}
|
|
if (qemu_close(fd) != 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not close the new file");
|
|
}
|
|
}
|
|
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 QEMUOptionParameter raw_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
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_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_options = raw_create_options,
|
|
};
|
|
|
|
/***********************************************/
|
|
/* 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, QEMUOptionParameter *options,
|
|
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 */
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, "size")) {
|
|
total_size = options->value.n / BDRV_SECTOR_SIZE;
|
|
}
|
|
options++;
|
|
}
|
|
|
|
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 * BDRV_SECTOR_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_options = raw_create_options,
|
|
.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_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_options = raw_create_options,
|
|
|
|
.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_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_options = raw_create_options,
|
|
|
|
.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_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_options = raw_create_options,
|
|
|
|
.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_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__ */
|
|
|
|
#ifdef CONFIG_LINUX_AIO
|
|
/**
|
|
* Return the file descriptor for Linux AIO
|
|
*
|
|
* This function is a layering violation and should be removed when it becomes
|
|
* possible to call the block layer outside the global mutex. It allows the
|
|
* caller to hijack the file descriptor so I/O can be performed outside the
|
|
* block layer.
|
|
*/
|
|
int raw_get_aio_fd(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s;
|
|
|
|
if (!bs->drv) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
if (bs->drv == bdrv_find_format("raw")) {
|
|
bs = bs->file;
|
|
}
|
|
|
|
/* raw-posix has several protocols so just check for raw_aio_readv */
|
|
if (bs->drv->bdrv_aio_readv != raw_aio_readv) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
s = bs->opaque;
|
|
if (!s->use_aio) {
|
|
return -ENOTSUP;
|
|
}
|
|
return s->fd;
|
|
}
|
|
#endif /* CONFIG_LINUX_AIO */
|
|
|
|
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);
|