mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
343f85685c
qemu/block/raw-posix.c
Johannes Stezenbach 343f85685c block/raw-posix: Linux compat-ioctl warning workaround 
On Linux x86_64 host with 32bit userspace, running
qemu or even just "qemu-img create -f qcow2 some.img 1G"
causes a kernel warning:

ioctl32(qemu-img:5296): Unknown cmd fd(3) cmd(00005326){t:'S';sz:0} arg(7fffffff) on some.img
ioctl32(qemu-img:5296): Unknown cmd fd(3) cmd(801c0204){t:02;sz:28} arg(fff77350) on some.img

ioctl 00005326 is CDROM_DRIVE_STATUS,
ioctl 801c0204 is FDGETPRM.

The warning appears because the Linux compat-ioctl handler for these
ioctls only applies to block devices, while qemu also uses the ioctls on
plain files.  Work around by calling fstat() the ensure the ioctls are
only used on block devices.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-07-05 11:23:29 +02:00

1532 lines
39 KiB
C
Raw Blame History

/*
* 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-char.h"
#include "qemu-log.h"
#include "block_int.h"
#include "module.h"
#include "block/raw-posix-aio.h"
#ifdef CONFIG_COCOA
#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>
#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;
#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
uint8_t *aligned_buf;
unsigned aligned_buf_size;
#ifdef CONFIG_XFS
bool is_xfs : 1;
#endif
} BDRVRawState;
static int fd_open(BlockDriverState *bs);
static int64_t raw_getlength(BlockDriverState *bs);
#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 int raw_open_common(BlockDriverState *bs, const char *filename,
int bdrv_flags, int open_flags)
{
BDRVRawState *s = bs->opaque;
int fd, ret;
ret = raw_normalize_devicepath(&filename);
if (ret != 0) {
return ret;
}
s->open_flags = open_flags | O_BINARY;
s->open_flags &= ~O_ACCMODE;
if (bdrv_flags & BDRV_O_RDWR) {
s->open_flags |= O_RDWR;
} else {
s->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))
s->open_flags |= O_DIRECT;
if (!(bdrv_flags & BDRV_O_CACHE_WB))
s->open_flags |= O_DSYNC;
s->fd = -1;
fd = qemu_open(filename, s->open_flags, 0644);
if (fd < 0) {
ret = -errno;
if (ret == -EROFS)
ret = -EACCES;
return ret;
}
s->fd = fd;
s->aligned_buf = NULL;
if ((bdrv_flags & BDRV_O_NOCACHE)) {
/*
* Allocate a buffer for read/modify/write cycles. Chose the size
* pessimistically as we don't know the block size yet.
*/
s->aligned_buf_size = 32 * MAX_BLOCKSIZE;
s->aligned_buf = qemu_memalign(MAX_BLOCKSIZE, s->aligned_buf_size);
if (s->aligned_buf == NULL) {
goto out_close;
}
}
#ifdef CONFIG_LINUX_AIO
if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
(BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
/* We're falling back to POSIX AIO in some cases */
paio_init();
s->aio_ctx = laio_init();
if (!s->aio_ctx) {
goto out_free_buf;
}
s->use_aio = 1;
} else
#endif
{
if (paio_init() < 0) {
goto out_free_buf;
}
#ifdef CONFIG_LINUX_AIO
s->use_aio = 0;
#endif
}
#ifdef CONFIG_XFS
if (platform_test_xfs_fd(s->fd)) {
s->is_xfs = 1;
}
#endif
return 0;
out_free_buf:
qemu_vfree(s->aligned_buf);
out_close:
close(fd);
return -errno;
}
static int raw_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
s->type = FTYPE_FILE;
return raw_open_common(bs, filename, flags, 0);
}
/* XXX: use host sector size if necessary with:
#ifdef DIOCGSECTORSIZE
{
unsigned int sectorsize = 512;
if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
sectorsize > bufsize)
bufsize = sectorsize;
}
#endif
#ifdef CONFIG_COCOA
uint32_t blockSize = 512;
if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
bufsize = blockSize;
}
#endif
*/
/*
* offset and count are in bytes, but must be multiples of 512 for files
* opened with O_DIRECT. buf must be aligned to 512 bytes then.
*
* This function may be called without alignment if the caller ensures
* that O_DIRECT is not in effect.
*/
static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int ret;
ret = fd_open(bs);
if (ret < 0)
return ret;
ret = pread(s->fd, buf, count, offset);
if (ret == count)
return ret;
/* Allow reads beyond the end (needed for pwrite) */
if ((ret == 0) && bs->growable) {
int64_t size = raw_getlength(bs);
if (offset >= size) {
memset(buf, 0, count);
return count;
}
}
DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
"] read failed %d : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, ret, errno, strerror(errno));
/* Try harder for CDrom. */
if (s->type != FTYPE_FILE) {
ret = pread(s->fd, buf, count, offset);
if (ret == count)
return ret;
ret = pread(s->fd, buf, count, offset);
if (ret == count)
return ret;
DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
"] retry read failed %d : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, ret, errno, strerror(errno));
}
return (ret < 0) ? -errno : ret;
}
/*
* offset and count are in bytes, but must be multiples of the sector size
* for files opened with O_DIRECT. buf must be aligned to sector size bytes
* then.
*
* This function may be called without alignment if the caller ensures
* that O_DIRECT is not in effect.
*/
static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
const uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int ret;
ret = fd_open(bs);
if (ret < 0)
return -errno;
ret = pwrite(s->fd, buf, count, offset);
if (ret == count)
return ret;
DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
"] write failed %d : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, ret, errno, strerror(errno));
return (ret < 0) ? -errno : ret;
}
/*
* offset and count are in bytes and possibly not aligned. For files opened
* with O_DIRECT, necessary alignments are ensured before calling
* raw_pread_aligned to do the actual read.
*/
static int raw_pread(BlockDriverState *bs, int64_t offset,
uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
unsigned sector_mask = bs->buffer_alignment - 1;
int size, ret, shift, sum;
sum = 0;
if (s->aligned_buf != NULL) {
if (offset & sector_mask) {
/* align offset on a sector size bytes boundary */
shift = offset & sector_mask;
size = (shift + count + sector_mask) & ~sector_mask;
if (size > s->aligned_buf_size)
size = s->aligned_buf_size;
ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
if (ret < 0)
return ret;
size = bs->buffer_alignment - shift;
if (size > count)
size = count;
memcpy(buf, s->aligned_buf + shift, size);
buf += size;
offset += size;
count -= size;
sum += size;
if (count == 0)
return sum;
}
if (count & sector_mask || (uintptr_t) buf & sector_mask) {
/* read on aligned buffer */
while (count) {
size = (count + sector_mask) & ~sector_mask;
if (size > s->aligned_buf_size)
size = s->aligned_buf_size;
ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
if (ret < 0) {
return ret;
} else if (ret == 0) {
fprintf(stderr, "raw_pread: read beyond end of file\n");
abort();
}
size = ret;
if (size > count)
size = count;
memcpy(buf, s->aligned_buf, size);
buf += size;
offset += size;
count -= size;
sum += size;
}
return sum;
}
}
return raw_pread_aligned(bs, offset, buf, count) + sum;
}
static int raw_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
ret = raw_pread(bs, sector_num * BDRV_SECTOR_SIZE, buf,
nb_sectors * BDRV_SECTOR_SIZE);
if (ret == (nb_sectors * BDRV_SECTOR_SIZE))
ret = 0;
return ret;
}
/*
* offset and count are in bytes and possibly not aligned. For files opened
* with O_DIRECT, necessary alignments are ensured before calling
* raw_pwrite_aligned to do the actual write.
*/
static int raw_pwrite(BlockDriverState *bs, int64_t offset,
const uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
unsigned sector_mask = bs->buffer_alignment - 1;
int size, ret, shift, sum;
sum = 0;
if (s->aligned_buf != NULL) {
if (offset & sector_mask) {
/* align offset on a sector size bytes boundary */
shift = offset & sector_mask;
ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf,
bs->buffer_alignment);
if (ret < 0)
return ret;
size = bs->buffer_alignment - shift;
if (size > count)
size = count;
memcpy(s->aligned_buf + shift, buf, size);
ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf,
bs->buffer_alignment);
if (ret < 0)
return ret;
buf += size;
offset += size;
count -= size;
sum += size;
if (count == 0)
return sum;
}
if (count & sector_mask || (uintptr_t) buf & sector_mask) {
while ((size = (count & ~sector_mask)) != 0) {
if (size > s->aligned_buf_size)
size = s->aligned_buf_size;
memcpy(s->aligned_buf, buf, size);
ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
if (ret < 0)
return ret;
buf += ret;
offset += ret;
count -= ret;
sum += ret;
}
/* here, count < sector_size because (count & ~sector_mask) == 0 */
if (count) {
ret = raw_pread_aligned(bs, offset, s->aligned_buf,
bs->buffer_alignment);
if (ret < 0)
return ret;
memcpy(s->aligned_buf, buf, count);
ret = raw_pwrite_aligned(bs, offset, s->aligned_buf,
bs->buffer_alignment);
if (ret < 0)
return ret;
if (count < ret)
ret = count;
sum += ret;
}
return sum;
}
}
return raw_pwrite_aligned(bs, offset, buf, count) + sum;
}
static int raw_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
int ret;
ret = raw_pwrite(bs, sector_num * BDRV_SECTOR_SIZE, buf,
nb_sectors * BDRV_SECTOR_SIZE);
if (ret == (nb_sectors * BDRV_SECTOR_SIZE))
ret = 0;
return ret;
}
/*
* Check if all memory in this vector is sector aligned.
*/
static int qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
{
int i;
for (i = 0; i < qiov->niov; i++) {
if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) {
return 0;
}
}
return 1;
}
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 telll the low-level
* driver that it needs to copy the buffer.
*/
if (s->aligned_buf) {
if (!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;
if (s->fd >= 0) {
close(s->fd);
s->fd = -1;
if (s->aligned_buf != NULL)
qemu_vfree(s->aligned_buf);
}
}
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVRawState *s = bs->opaque;
if (s->type != FTYPE_FILE)
return -ENOTSUP;
if (ftruncate(s->fd, offset) < 0)
return -errno;
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
#ifdef CONFIG_COCOA
size = LONG_LONG_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 int raw_create(const char *filename, QEMUOptionParameter *options)
{
int fd;
int result = 0;
int64_t total_size = 0;
/* Read out options */
while (options && options->name) {
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
total_size = options->value.n / BDRV_SECTOR_SIZE;
}
options++;
}
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
0644);
if (fd < 0) {
result = -errno;
} else {
if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
result = -errno;
}
if (close(fd) != 0) {
result = -errno;
}
}
return result;
}
static int raw_flush(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
return qemu_fdatasync(s->fd);
}
#ifdef CONFIG_XFS
static int xfs_discard(BDRVRawState *s, int64_t sector_num, int nb_sectors)
{
struct xfs_flock64 fl;
memset(&fl, 0, sizeof(fl));
fl.l_whence = SEEK_SET;
fl.l_start = sector_num << 9;
fl.l_len = (int64_t)nb_sectors << 9;
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 int raw_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
{
#ifdef CONFIG_XFS
BDRVRawState *s = bs->opaque;
if (s->is_xfs) {
return xfs_discard(s, sector_num, nb_sectors);
}
#endif
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_probe = NULL, /* no probe for protocols */
.bdrv_file_open = raw_open,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_flush = raw_flush,
.bdrv_discard = raw_discard,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.create_options = raw_create_options,
};
/***********************************************/
/* host device */
#ifdef CONFIG_COCOA
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 hdev_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
#ifdef CONFIG_COCOA
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 = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0) {
bsdPath[strlen(bsdPath)-1] = '1';
} else {
close(fd);
}
filename = bsdPath;
}
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
return raw_open_common(bs, filename, flags, 0);
}
#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) {
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 = 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;
if (fd_open(bs) < 0)
return NULL;
return paio_ioctl(bs, s->fd, req, buf, 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 int hdev_create(const char *filename, QEMUOptionParameter *options)
{
int fd;
int ret = 0;
struct stat stat_buf;
int64_t total_size = 0;
/* Read out options */
while (options && options->name) {
if (!strcmp(options->name, "size")) {
total_size = options->value.n / BDRV_SECTOR_SIZE;
}
options++;
}
fd = open(filename, O_WRONLY | O_BINARY);
if (fd < 0)
return -errno;
if (fstat(fd, &stat_buf) < 0)
ret = -errno;
else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
ret = -ENODEV;
else if (lseek(fd, 0, SEEK_END) < total_size * BDRV_SECTOR_SIZE)
ret = -ENOSPC;
close(fd);
return ret;
}
static int hdev_has_zero_init(BlockDriverState *bs)
{
return 0;
}
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.protocol_name = "host_device",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = hdev_probe_device,
.bdrv_file_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
.bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_flush = raw_flush,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* generic scsi device */
#ifdef __linux__
.bdrv_ioctl = hdev_ioctl,
.bdrv_aio_ioctl = hdev_aio_ioctl,
#endif
};
#ifdef __linux__
static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
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, filename, flags, O_NONBLOCK);
if (ret)
return ret;
/* close fd so that we can reopen it as needed */
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))
prio = 50;
fd = 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:
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 int floppy_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
int fd;
if (s->fd >= 0) {
close(s->fd);
s->fd = -1;
}
fd = open(bs->filename, s->open_flags | O_NONBLOCK);
if (fd >= 0) {
if (ioctl(fd, FDEJECT, 0) < 0)
perror("FDEJECT");
close(fd);
}
return 0;
}
static BlockDriver bdrv_host_floppy = {
.format_name = "host_floppy",
.protocol_name = "host_floppy",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = floppy_probe_device,
.bdrv_file_open = floppy_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
.bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_flush = raw_flush,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = floppy_is_inserted,
.bdrv_media_changed = floppy_media_changed,
.bdrv_eject = floppy_eject,
};
static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
s->type = FTYPE_CD;
/* open will not fail even if no CD is inserted, so add O_NONBLOCK */
return raw_open_common(bs, filename, flags, O_NONBLOCK);
}
static int cdrom_probe_device(const char *filename)
{
int fd, ret;
int prio = 0;
struct stat st;
fd = 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:
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 int cdrom_eject(BlockDriverState *bs, int 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");
}
return 0;
}
static int cdrom_set_locked(BlockDriverState *bs, int 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"); */
}
return 0;
}
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.protocol_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = cdrom_probe_device,
.bdrv_file_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
.bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_flush = raw_flush,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = cdrom_is_inserted,
.bdrv_eject = cdrom_eject,
.bdrv_set_locked = cdrom_set_locked,
/* 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, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int ret;
s->type = FTYPE_CD;
ret = raw_open_common(bs, filename, flags, 0);
if (ret)
return ret;
/* make sure the door isnt 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)
close(s->fd);
fd = open(bs->filename, s->open_flags, 0644);
if (fd < 0) {
s->fd = -1;
return -EIO;
}
s->fd = fd;
/* make sure the door isnt locked at this time */
ioctl(s->fd, CDIOCALLOW);
return 0;
}
static int cdrom_is_inserted(BlockDriverState *bs)
{
return raw_getlength(bs) > 0;
}
static int cdrom_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
if (s->fd < 0)
return -ENOTSUP;
(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");
}
if (cdrom_reopen(bs) < 0)
return -ENOTSUP;
return 0;
}
static int cdrom_set_locked(BlockDriverState *bs, int locked)
{
BDRVRawState *s = bs->opaque;
if (s->fd < 0)
return -ENOTSUP;
if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
/*
* Note: an error can happen if the distribution automatically
* mounts the CD-ROM
*/
/* perror("CDROM_LOCKDOOR"); */
}
return 0;
}
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.protocol_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = cdrom_probe_device,
.bdrv_file_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
.bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_flush = raw_flush,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = cdrom_is_inserted,
.bdrv_eject = cdrom_eject,
.bdrv_set_locked = cdrom_set_locked,
};
#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);
Reference in New Issue View Git Blame Copy Permalink