9c3db310ff
Currently, qemu crashes whenever someone queries the block status of an
unaligned image tail of an O_DIRECT image:
$ echo > foo
$ qemu-img map --image-opts driver=file,filename=foo,cache.direct=on
Offset Length Mapped to File
qemu-img: block/io.c:2093: bdrv_co_block_status: Assertion `*pnum &&
QEMU_IS_ALIGNED(*pnum, align) && align > offset - aligned_offset'
failed.
This is because bdrv_co_block_status() checks that the result returned
by the driver's implementation is aligned to the request_alignment, but
file-posix can fail to do so, which is actually mentioned in a comment
there: "[...] possibly including a partial sector at EOF".
Fix this by rounding up those partial sectors.
There are two possible alternative fixes:
(1) We could refuse to open unaligned image files with O_DIRECT
altogether. That sounds reasonable until you realize that qcow2
does necessarily not fill up its metadata clusters, and that nobody
runs qemu-img create with O_DIRECT. Therefore, unpreallocated qcow2
files usually have an unaligned image tail.
(2) bdrv_co_block_status() could ignore unaligned tails. It actually
throws away everything past the EOF already, so that sounds
reasonable.
Unfortunately, the block layer knows file lengths only with a
granularity of BDRV_SECTOR_SIZE, so bdrv_co_block_status() usually
would have to guess whether its file length information is inexact
or whether the driver is broken.
Fixing what raw_co_block_status() returns is the safest thing to do.
There seems to be no other block driver that sets request_alignment and
does not make sure that it always returns aligned values.
Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
3693 lines
104 KiB
C
3693 lines
104 KiB
C
/*
|
|
* 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/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "qemu/cutils.h"
|
|
#include "qemu/error-report.h"
|
|
#include "block/block_int.h"
|
|
#include "qemu/module.h"
|
|
#include "qemu/option.h"
|
|
#include "trace.h"
|
|
#include "block/thread-pool.h"
|
|
#include "qemu/iov.h"
|
|
#include "block/raw-aio.h"
|
|
#include "qapi/qmp/qdict.h"
|
|
#include "qapi/qmp/qstring.h"
|
|
|
|
#include "scsi/pr-manager.h"
|
|
#include "scsi/constants.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 <IOKit/storage/IODVDMedia.h>
|
|
#include <CoreFoundation/CoreFoundation.h>
|
|
#endif
|
|
|
|
#ifdef __sun__
|
|
#define _POSIX_PTHREAD_SEMANTICS 1
|
|
#include <sys/dkio.h>
|
|
#endif
|
|
#ifdef __linux__
|
|
#include <sys/ioctl.h>
|
|
#include <sys/param.h>
|
|
#include <sys/syscall.h>
|
|
#include <linux/cdrom.h>
|
|
#include <linux/fd.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/hdreg.h>
|
|
#include <scsi/sg.h>
|
|
#ifdef __s390__
|
|
#include <asm/dasd.h>
|
|
#endif
|
|
#ifndef FS_NOCOW_FL
|
|
#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
|
|
#endif
|
|
#endif
|
|
#if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
|
|
#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
|
|
|
|
#include "trace.h"
|
|
|
|
/* 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 MAX_BLOCKSIZE 4096
|
|
|
|
/* Posix file locking bytes. Libvirt takes byte 0, we start from higher bytes,
|
|
* leaving a few more bytes for its future use. */
|
|
#define RAW_LOCK_PERM_BASE 100
|
|
#define RAW_LOCK_SHARED_BASE 200
|
|
|
|
typedef struct BDRVRawState {
|
|
int fd;
|
|
bool use_lock;
|
|
int type;
|
|
int open_flags;
|
|
size_t buf_align;
|
|
|
|
/* The current permissions. */
|
|
uint64_t perm;
|
|
uint64_t shared_perm;
|
|
|
|
/* The perms bits whose corresponding bytes are already locked in
|
|
* s->fd. */
|
|
uint64_t locked_perm;
|
|
uint64_t locked_shared_perm;
|
|
|
|
int perm_change_fd;
|
|
BDRVReopenState *reopen_state;
|
|
|
|
#ifdef CONFIG_XFS
|
|
bool is_xfs:1;
|
|
#endif
|
|
bool has_discard:1;
|
|
bool has_write_zeroes:1;
|
|
bool discard_zeroes:1;
|
|
bool use_linux_aio:1;
|
|
bool page_cache_inconsistent:1;
|
|
bool has_fallocate;
|
|
bool needs_alignment;
|
|
bool drop_cache;
|
|
bool check_cache_dropped;
|
|
|
|
PRManager *pr_mgr;
|
|
} BDRVRawState;
|
|
|
|
typedef struct BDRVRawReopenState {
|
|
int fd;
|
|
int open_flags;
|
|
bool drop_cache;
|
|
bool check_cache_dropped;
|
|
} BDRVRawReopenState;
|
|
|
|
static int fd_open(BlockDriverState *bs);
|
|
static int64_t raw_getlength(BlockDriverState *bs);
|
|
|
|
typedef struct RawPosixAIOData {
|
|
BlockDriverState *bs;
|
|
int aio_type;
|
|
int aio_fildes;
|
|
|
|
off_t aio_offset;
|
|
uint64_t aio_nbytes;
|
|
|
|
union {
|
|
struct {
|
|
struct iovec *iov;
|
|
int niov;
|
|
} io;
|
|
struct {
|
|
uint64_t cmd;
|
|
void *buf;
|
|
} ioctl;
|
|
struct {
|
|
int aio_fd2;
|
|
off_t aio_offset2;
|
|
} copy_range;
|
|
struct {
|
|
PreallocMode prealloc;
|
|
Error **errp;
|
|
} truncate;
|
|
};
|
|
} 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, Error **errp)
|
|
{
|
|
static char namebuf[PATH_MAX];
|
|
const char *dp, *fname;
|
|
struct stat sb;
|
|
|
|
fname = *filename;
|
|
dp = strrchr(fname, '/');
|
|
if (lstat(fname, &sb) < 0) {
|
|
error_setg_errno(errp, errno, "%s: stat failed", fname);
|
|
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);
|
|
}
|
|
*filename = namebuf;
|
|
warn_report("%s is a block device, using %s", fname, *filename);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static int raw_normalize_devicepath(const char **filename, Error **errp)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Get logical block size via ioctl. On success store it in @sector_size_p.
|
|
*/
|
|
static int probe_logical_blocksize(int fd, unsigned int *sector_size_p)
|
|
{
|
|
unsigned int sector_size;
|
|
bool success = false;
|
|
int i;
|
|
|
|
errno = ENOTSUP;
|
|
static const unsigned long ioctl_list[] = {
|
|
#ifdef BLKSSZGET
|
|
BLKSSZGET,
|
|
#endif
|
|
#ifdef DKIOCGETBLOCKSIZE
|
|
DKIOCGETBLOCKSIZE,
|
|
#endif
|
|
#ifdef DIOCGSECTORSIZE
|
|
DIOCGSECTORSIZE,
|
|
#endif
|
|
};
|
|
|
|
/* Try a few ioctls to get the right size */
|
|
for (i = 0; i < (int)ARRAY_SIZE(ioctl_list); i++) {
|
|
if (ioctl(fd, ioctl_list[i], §or_size) >= 0) {
|
|
*sector_size_p = sector_size;
|
|
success = true;
|
|
}
|
|
}
|
|
|
|
return success ? 0 : -errno;
|
|
}
|
|
|
|
/**
|
|
* Get physical block size of @fd.
|
|
* On success, store it in @blk_size and return 0.
|
|
* On failure, return -errno.
|
|
*/
|
|
static int probe_physical_blocksize(int fd, unsigned int *blk_size)
|
|
{
|
|
#ifdef BLKPBSZGET
|
|
if (ioctl(fd, BLKPBSZGET, blk_size) < 0) {
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
#else
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
/* Check if read is allowed with given memory buffer and length.
|
|
*
|
|
* This function is used to check O_DIRECT memory buffer and request alignment.
|
|
*/
|
|
static bool raw_is_io_aligned(int fd, void *buf, size_t len)
|
|
{
|
|
ssize_t ret = pread(fd, buf, len, 0);
|
|
|
|
if (ret >= 0) {
|
|
return true;
|
|
}
|
|
|
|
#ifdef __linux__
|
|
/* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
|
|
* other errors (e.g. real I/O error), which could happen on a failed
|
|
* drive, since we only care about probing alignment.
|
|
*/
|
|
if (errno != EINVAL) {
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
char *buf;
|
|
size_t max_align = MAX(MAX_BLOCKSIZE, getpagesize());
|
|
|
|
/* For SCSI generic devices the alignment is not really used.
|
|
With buffered I/O, we don't have any restrictions. */
|
|
if (bdrv_is_sg(bs) || !s->needs_alignment) {
|
|
bs->bl.request_alignment = 1;
|
|
s->buf_align = 1;
|
|
return;
|
|
}
|
|
|
|
bs->bl.request_alignment = 0;
|
|
s->buf_align = 0;
|
|
/* Let's try to use the logical blocksize for the alignment. */
|
|
if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) {
|
|
bs->bl.request_alignment = 0;
|
|
}
|
|
#ifdef CONFIG_XFS
|
|
if (s->is_xfs) {
|
|
struct dioattr da;
|
|
if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
|
|
bs->bl.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_align, 2 * max_align);
|
|
for (align = 512; align <= max_align; align <<= 1) {
|
|
if (raw_is_io_aligned(fd, buf + align, max_align)) {
|
|
s->buf_align = align;
|
|
break;
|
|
}
|
|
}
|
|
qemu_vfree(buf);
|
|
}
|
|
|
|
if (!bs->bl.request_alignment) {
|
|
size_t align;
|
|
buf = qemu_memalign(s->buf_align, max_align);
|
|
for (align = 512; align <= max_align; align <<= 1) {
|
|
if (raw_is_io_aligned(fd, buf, align)) {
|
|
bs->bl.request_alignment = align;
|
|
break;
|
|
}
|
|
}
|
|
qemu_vfree(buf);
|
|
}
|
|
|
|
if (!s->buf_align || !bs->bl.request_alignment) {
|
|
error_setg(errp, "Could not find working O_DIRECT alignment");
|
|
error_append_hint(errp, "Try cache.direct=off\n");
|
|
}
|
|
}
|
|
|
|
static void raw_parse_flags(int bdrv_flags, int *open_flags, bool has_writers)
|
|
{
|
|
bool read_write = false;
|
|
assert(open_flags != NULL);
|
|
|
|
*open_flags |= O_BINARY;
|
|
*open_flags &= ~O_ACCMODE;
|
|
|
|
if (bdrv_flags & BDRV_O_AUTO_RDONLY) {
|
|
read_write = has_writers;
|
|
} else if (bdrv_flags & BDRV_O_RDWR) {
|
|
read_write = true;
|
|
}
|
|
|
|
if (read_write) {
|
|
*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_parse_filename(const char *filename, QDict *options,
|
|
Error **errp)
|
|
{
|
|
bdrv_parse_filename_strip_prefix(filename, "file:", options);
|
|
}
|
|
|
|
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",
|
|
},
|
|
{
|
|
.name = "aio",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "host AIO implementation (threads, native)",
|
|
},
|
|
{
|
|
.name = "locking",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "file locking mode (on/off/auto, default: auto)",
|
|
},
|
|
{
|
|
.name = "pr-manager",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "id of persistent reservation manager object (default: none)",
|
|
},
|
|
#if defined(__linux__)
|
|
{
|
|
.name = "drop-cache",
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "invalidate page cache during live migration (default: on)",
|
|
},
|
|
#endif
|
|
{
|
|
.name = "x-check-cache-dropped",
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "check that page cache was dropped on live migration (default: off)"
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
static const char *const mutable_opts[] = { "x-check-cache-dropped", NULL };
|
|
|
|
static int raw_open_common(BlockDriverState *bs, QDict *options,
|
|
int bdrv_flags, int open_flags,
|
|
bool device, Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
QemuOpts *opts;
|
|
Error *local_err = NULL;
|
|
const char *filename = NULL;
|
|
const char *str;
|
|
BlockdevAioOptions aio, aio_default;
|
|
int fd, ret;
|
|
struct stat st;
|
|
OnOffAuto locking;
|
|
|
|
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, errp);
|
|
if (ret != 0) {
|
|
goto fail;
|
|
}
|
|
|
|
aio_default = (bdrv_flags & BDRV_O_NATIVE_AIO)
|
|
? BLOCKDEV_AIO_OPTIONS_NATIVE
|
|
: BLOCKDEV_AIO_OPTIONS_THREADS;
|
|
aio = qapi_enum_parse(&BlockdevAioOptions_lookup,
|
|
qemu_opt_get(opts, "aio"),
|
|
aio_default, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
s->use_linux_aio = (aio == BLOCKDEV_AIO_OPTIONS_NATIVE);
|
|
|
|
locking = qapi_enum_parse(&OnOffAuto_lookup,
|
|
qemu_opt_get(opts, "locking"),
|
|
ON_OFF_AUTO_AUTO, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
switch (locking) {
|
|
case ON_OFF_AUTO_ON:
|
|
s->use_lock = true;
|
|
if (!qemu_has_ofd_lock()) {
|
|
warn_report("File lock requested but OFD locking syscall is "
|
|
"unavailable, falling back to POSIX file locks");
|
|
error_printf("Due to the implementation, locks can be lost "
|
|
"unexpectedly.\n");
|
|
}
|
|
break;
|
|
case ON_OFF_AUTO_OFF:
|
|
s->use_lock = false;
|
|
break;
|
|
case ON_OFF_AUTO_AUTO:
|
|
s->use_lock = qemu_has_ofd_lock();
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
str = qemu_opt_get(opts, "pr-manager");
|
|
if (str) {
|
|
s->pr_mgr = pr_manager_lookup(str, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
s->drop_cache = qemu_opt_get_bool(opts, "drop-cache", true);
|
|
s->check_cache_dropped = qemu_opt_get_bool(opts, "x-check-cache-dropped",
|
|
false);
|
|
|
|
s->open_flags = open_flags;
|
|
raw_parse_flags(bdrv_flags, &s->open_flags, false);
|
|
|
|
s->fd = -1;
|
|
fd = qemu_open(filename, s->open_flags, 0644);
|
|
ret = fd < 0 ? -errno : 0;
|
|
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "Could not open '%s'", filename);
|
|
if (ret == -EROFS) {
|
|
ret = -EACCES;
|
|
}
|
|
goto fail;
|
|
}
|
|
s->fd = fd;
|
|
|
|
s->perm = 0;
|
|
s->shared_perm = BLK_PERM_ALL;
|
|
|
|
#ifdef CONFIG_LINUX_AIO
|
|
/* Currently Linux does AIO only for files opened with O_DIRECT */
|
|
if (s->use_linux_aio) {
|
|
if (!(s->open_flags & O_DIRECT)) {
|
|
error_setg(errp, "aio=native was specified, but it requires "
|
|
"cache.direct=on, which was not specified.");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
if (!aio_setup_linux_aio(bdrv_get_aio_context(bs), errp)) {
|
|
error_prepend(errp, "Unable to use native AIO: ");
|
|
goto fail;
|
|
}
|
|
}
|
|
#else
|
|
if (s->use_linux_aio) {
|
|
error_setg(errp, "aio=native was specified, but is not supported "
|
|
"in this build.");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
#endif /* !defined(CONFIG_LINUX_AIO) */
|
|
|
|
s->has_discard = true;
|
|
s->has_write_zeroes = true;
|
|
if ((bs->open_flags & BDRV_O_NOCACHE) != 0) {
|
|
s->needs_alignment = true;
|
|
}
|
|
|
|
if (fstat(s->fd, &st) < 0) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, errno, "Could not stat file");
|
|
goto fail;
|
|
}
|
|
|
|
if (!device) {
|
|
if (S_ISBLK(st.st_mode)) {
|
|
warn_report("Opening a block device as a file using the '%s' "
|
|
"driver is deprecated", bs->drv->format_name);
|
|
} else if (S_ISCHR(st.st_mode)) {
|
|
warn_report("Opening a character device as a file using the '%s' "
|
|
"driver is deprecated", bs->drv->format_name);
|
|
} else if (!S_ISREG(st.st_mode)) {
|
|
error_setg(errp, "A regular file was expected by the '%s' driver, "
|
|
"but something else was given", bs->drv->format_name);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
} else {
|
|
s->discard_zeroes = true;
|
|
s->has_fallocate = true;
|
|
}
|
|
} else {
|
|
if (!(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
|
|
error_setg(errp, "'%s' driver expects either "
|
|
"a character or block device", bs->drv->format_name);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
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 __FreeBSD__
|
|
if (S_ISCHR(st.st_mode)) {
|
|
/*
|
|
* The file is a char device (disk), which on FreeBSD isn't behind
|
|
* a pager, so force all requests to be aligned. This is needed
|
|
* so QEMU makes sure all IO operations on the device are aligned
|
|
* to sector size, or else FreeBSD will reject them with EINVAL.
|
|
*/
|
|
s->needs_alignment = true;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_XFS
|
|
if (platform_test_xfs_fd(s->fd)) {
|
|
s->is_xfs = true;
|
|
}
|
|
#endif
|
|
|
|
bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK;
|
|
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;
|
|
|
|
s->type = FTYPE_FILE;
|
|
return raw_open_common(bs, options, flags, 0, false, errp);
|
|
}
|
|
|
|
typedef enum {
|
|
RAW_PL_PREPARE,
|
|
RAW_PL_COMMIT,
|
|
RAW_PL_ABORT,
|
|
} RawPermLockOp;
|
|
|
|
#define PERM_FOREACH(i) \
|
|
for ((i) = 0; (1ULL << (i)) <= BLK_PERM_ALL; i++)
|
|
|
|
/* Lock bytes indicated by @perm_lock_bits and @shared_perm_lock_bits in the
|
|
* file; if @unlock == true, also unlock the unneeded bytes.
|
|
* @shared_perm_lock_bits is the mask of all permissions that are NOT shared.
|
|
*/
|
|
static int raw_apply_lock_bytes(BDRVRawState *s, int fd,
|
|
uint64_t perm_lock_bits,
|
|
uint64_t shared_perm_lock_bits,
|
|
bool unlock, Error **errp)
|
|
{
|
|
int ret;
|
|
int i;
|
|
uint64_t locked_perm, locked_shared_perm;
|
|
|
|
if (s) {
|
|
locked_perm = s->locked_perm;
|
|
locked_shared_perm = s->locked_shared_perm;
|
|
} else {
|
|
/*
|
|
* We don't have the previous bits, just lock/unlock for each of the
|
|
* requested bits.
|
|
*/
|
|
if (unlock) {
|
|
locked_perm = BLK_PERM_ALL;
|
|
locked_shared_perm = BLK_PERM_ALL;
|
|
} else {
|
|
locked_perm = 0;
|
|
locked_shared_perm = 0;
|
|
}
|
|
}
|
|
|
|
PERM_FOREACH(i) {
|
|
int off = RAW_LOCK_PERM_BASE + i;
|
|
uint64_t bit = (1ULL << i);
|
|
if ((perm_lock_bits & bit) && !(locked_perm & bit)) {
|
|
ret = qemu_lock_fd(fd, off, 1, false);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to lock byte %d", off);
|
|
return ret;
|
|
} else if (s) {
|
|
s->locked_perm |= bit;
|
|
}
|
|
} else if (unlock && (locked_perm & bit) && !(perm_lock_bits & bit)) {
|
|
ret = qemu_unlock_fd(fd, off, 1);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to unlock byte %d", off);
|
|
return ret;
|
|
} else if (s) {
|
|
s->locked_perm &= ~bit;
|
|
}
|
|
}
|
|
}
|
|
PERM_FOREACH(i) {
|
|
int off = RAW_LOCK_SHARED_BASE + i;
|
|
uint64_t bit = (1ULL << i);
|
|
if ((shared_perm_lock_bits & bit) && !(locked_shared_perm & bit)) {
|
|
ret = qemu_lock_fd(fd, off, 1, false);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to lock byte %d", off);
|
|
return ret;
|
|
} else if (s) {
|
|
s->locked_shared_perm |= bit;
|
|
}
|
|
} else if (unlock && (locked_shared_perm & bit) &&
|
|
!(shared_perm_lock_bits & bit)) {
|
|
ret = qemu_unlock_fd(fd, off, 1);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to unlock byte %d", off);
|
|
return ret;
|
|
} else if (s) {
|
|
s->locked_shared_perm &= ~bit;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Check "unshared" bytes implied by @perm and ~@shared_perm in the file. */
|
|
static int raw_check_lock_bytes(int fd, uint64_t perm, uint64_t shared_perm,
|
|
Error **errp)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
PERM_FOREACH(i) {
|
|
int off = RAW_LOCK_SHARED_BASE + i;
|
|
uint64_t p = 1ULL << i;
|
|
if (perm & p) {
|
|
ret = qemu_lock_fd_test(fd, off, 1, true);
|
|
if (ret) {
|
|
char *perm_name = bdrv_perm_names(p);
|
|
error_setg(errp,
|
|
"Failed to get \"%s\" lock",
|
|
perm_name);
|
|
g_free(perm_name);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
PERM_FOREACH(i) {
|
|
int off = RAW_LOCK_PERM_BASE + i;
|
|
uint64_t p = 1ULL << i;
|
|
if (!(shared_perm & p)) {
|
|
ret = qemu_lock_fd_test(fd, off, 1, true);
|
|
if (ret) {
|
|
char *perm_name = bdrv_perm_names(p);
|
|
error_setg(errp,
|
|
"Failed to get shared \"%s\" lock",
|
|
perm_name);
|
|
g_free(perm_name);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int raw_handle_perm_lock(BlockDriverState *bs,
|
|
RawPermLockOp op,
|
|
uint64_t new_perm, uint64_t new_shared,
|
|
Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret = 0;
|
|
Error *local_err = NULL;
|
|
|
|
if (!s->use_lock) {
|
|
return 0;
|
|
}
|
|
|
|
if (bdrv_get_flags(bs) & BDRV_O_INACTIVE) {
|
|
return 0;
|
|
}
|
|
|
|
switch (op) {
|
|
case RAW_PL_PREPARE:
|
|
if ((s->perm | new_perm) == s->perm &&
|
|
(s->shared_perm & new_shared) == s->shared_perm)
|
|
{
|
|
/*
|
|
* We are going to unlock bytes, it should not fail. If it fail due
|
|
* to some fs-dependent permission-unrelated reasons (which occurs
|
|
* sometimes on NFS and leads to abort in bdrv_replace_child) we
|
|
* can't prevent such errors by any check here. And we ignore them
|
|
* anyway in ABORT and COMMIT.
|
|
*/
|
|
return 0;
|
|
}
|
|
ret = raw_apply_lock_bytes(s, s->fd, s->perm | new_perm,
|
|
~s->shared_perm | ~new_shared,
|
|
false, errp);
|
|
if (!ret) {
|
|
ret = raw_check_lock_bytes(s->fd, new_perm, new_shared, errp);
|
|
if (!ret) {
|
|
return 0;
|
|
}
|
|
error_append_hint(errp,
|
|
"Is another process using the image [%s]?\n",
|
|
bs->filename);
|
|
}
|
|
op = RAW_PL_ABORT;
|
|
/* fall through to unlock bytes. */
|
|
case RAW_PL_ABORT:
|
|
raw_apply_lock_bytes(s, s->fd, s->perm, ~s->shared_perm,
|
|
true, &local_err);
|
|
if (local_err) {
|
|
/* Theoretically the above call only unlocks bytes and it cannot
|
|
* fail. Something weird happened, report it.
|
|
*/
|
|
warn_report_err(local_err);
|
|
}
|
|
break;
|
|
case RAW_PL_COMMIT:
|
|
raw_apply_lock_bytes(s, s->fd, new_perm, ~new_shared,
|
|
true, &local_err);
|
|
if (local_err) {
|
|
/* Theoretically the above call only unlocks bytes and it cannot
|
|
* fail. Something weird happened, report it.
|
|
*/
|
|
warn_report_err(local_err);
|
|
}
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int raw_reconfigure_getfd(BlockDriverState *bs, int flags,
|
|
int *open_flags, uint64_t perm, bool force_dup,
|
|
Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd = -1;
|
|
int ret;
|
|
bool has_writers = perm &
|
|
(BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_RESIZE);
|
|
int fcntl_flags = O_APPEND | O_NONBLOCK;
|
|
#ifdef O_NOATIME
|
|
fcntl_flags |= O_NOATIME;
|
|
#endif
|
|
|
|
*open_flags = 0;
|
|
if (s->type == FTYPE_CD) {
|
|
*open_flags |= O_NONBLOCK;
|
|
}
|
|
|
|
raw_parse_flags(flags, open_flags, has_writers);
|
|
|
|
#ifdef O_ASYNC
|
|
/* Not all operating systems have O_ASYNC, and those that don't
|
|
* will not let us track the state into rs->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 (!force_dup && *open_flags == s->open_flags) {
|
|
/* We're lucky, the existing fd is fine */
|
|
return s->fd;
|
|
}
|
|
|
|
if ((*open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
|
|
/* dup the original fd */
|
|
fd = qemu_dup(s->fd);
|
|
if (fd >= 0) {
|
|
ret = fcntl_setfl(fd, *open_flags);
|
|
if (ret) {
|
|
qemu_close(fd);
|
|
fd = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
|
|
if (fd == -1) {
|
|
const char *normalized_filename = bs->filename;
|
|
ret = raw_normalize_devicepath(&normalized_filename, errp);
|
|
if (ret >= 0) {
|
|
assert(!(*open_flags & O_CREAT));
|
|
fd = qemu_open(normalized_filename, *open_flags);
|
|
if (fd == -1) {
|
|
error_setg_errno(errp, errno, "Could not reopen file");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
static int raw_reopen_prepare(BDRVReopenState *state,
|
|
BlockReopenQueue *queue, Error **errp)
|
|
{
|
|
BDRVRawState *s;
|
|
BDRVRawReopenState *rs;
|
|
QemuOpts *opts;
|
|
int ret;
|
|
Error *local_err = NULL;
|
|
|
|
assert(state != NULL);
|
|
assert(state->bs != NULL);
|
|
|
|
s = state->bs->opaque;
|
|
|
|
state->opaque = g_new0(BDRVRawReopenState, 1);
|
|
rs = state->opaque;
|
|
|
|
/* Handle options changes */
|
|
opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
|
|
qemu_opts_absorb_qdict(opts, state->options, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
rs->drop_cache = qemu_opt_get_bool_del(opts, "drop-cache", true);
|
|
rs->check_cache_dropped =
|
|
qemu_opt_get_bool_del(opts, "x-check-cache-dropped", false);
|
|
|
|
/* This driver's reopen function doesn't currently allow changing
|
|
* other options, so let's put them back in the original QDict and
|
|
* bdrv_reopen_prepare() will detect changes and complain. */
|
|
qemu_opts_to_qdict(opts, state->options);
|
|
|
|
rs->fd = raw_reconfigure_getfd(state->bs, state->flags, &rs->open_flags,
|
|
state->perm, true, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* Fail already reopen_prepare() if we can't get a working O_DIRECT
|
|
* alignment with the new fd. */
|
|
if (rs->fd != -1) {
|
|
raw_probe_alignment(state->bs, rs->fd, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto out_fd;
|
|
}
|
|
}
|
|
|
|
s->reopen_state = state;
|
|
ret = 0;
|
|
out_fd:
|
|
if (ret < 0) {
|
|
qemu_close(rs->fd);
|
|
rs->fd = -1;
|
|
}
|
|
out:
|
|
qemu_opts_del(opts);
|
|
return ret;
|
|
}
|
|
|
|
static void raw_reopen_commit(BDRVReopenState *state)
|
|
{
|
|
BDRVRawReopenState *rs = state->opaque;
|
|
BDRVRawState *s = state->bs->opaque;
|
|
|
|
s->drop_cache = rs->drop_cache;
|
|
s->check_cache_dropped = rs->check_cache_dropped;
|
|
s->open_flags = rs->open_flags;
|
|
|
|
qemu_close(s->fd);
|
|
s->fd = rs->fd;
|
|
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
|
|
assert(s->reopen_state == state);
|
|
s->reopen_state = NULL;
|
|
}
|
|
|
|
|
|
static void raw_reopen_abort(BDRVReopenState *state)
|
|
{
|
|
BDRVRawReopenState *rs = state->opaque;
|
|
BDRVRawState *s = state->bs->opaque;
|
|
|
|
/* nothing to do if NULL, we didn't get far enough */
|
|
if (rs == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (rs->fd >= 0) {
|
|
qemu_close(rs->fd);
|
|
rs->fd = -1;
|
|
}
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
|
|
assert(s->reopen_state == state);
|
|
s->reopen_state = NULL;
|
|
}
|
|
|
|
static int hdev_get_max_transfer_length(BlockDriverState *bs, int fd)
|
|
{
|
|
#ifdef BLKSECTGET
|
|
int max_bytes = 0;
|
|
short max_sectors = 0;
|
|
if (bs->sg && ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
|
|
return max_bytes;
|
|
} else if (!bs->sg && ioctl(fd, BLKSECTGET, &max_sectors) == 0) {
|
|
return max_sectors << BDRV_SECTOR_BITS;
|
|
} else {
|
|
return -errno;
|
|
}
|
|
#else
|
|
return -ENOSYS;
|
|
#endif
|
|
}
|
|
|
|
static int hdev_get_max_segments(const struct stat *st)
|
|
{
|
|
#ifdef CONFIG_LINUX
|
|
char buf[32];
|
|
const char *end;
|
|
char *sysfspath;
|
|
int ret;
|
|
int fd = -1;
|
|
long max_segments;
|
|
|
|
sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
|
|
major(st->st_rdev), minor(st->st_rdev));
|
|
fd = open(sysfspath, O_RDONLY);
|
|
if (fd == -1) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
do {
|
|
ret = read(fd, buf, sizeof(buf) - 1);
|
|
} while (ret == -1 && errno == EINTR);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
goto out;
|
|
} else if (ret == 0) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
buf[ret] = 0;
|
|
/* The file is ended with '\n', pass 'end' to accept that. */
|
|
ret = qemu_strtol(buf, &end, 10, &max_segments);
|
|
if (ret == 0 && end && *end == '\n') {
|
|
ret = max_segments;
|
|
}
|
|
|
|
out:
|
|
if (fd != -1) {
|
|
close(fd);
|
|
}
|
|
g_free(sysfspath);
|
|
return ret;
|
|
#else
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct stat st;
|
|
|
|
if (!fstat(s->fd, &st)) {
|
|
if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) {
|
|
int ret = hdev_get_max_transfer_length(bs, s->fd);
|
|
if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) {
|
|
bs->bl.max_transfer = pow2floor(ret);
|
|
}
|
|
ret = hdev_get_max_segments(&st);
|
|
if (ret > 0) {
|
|
bs->bl.max_transfer = MIN(bs->bl.max_transfer,
|
|
ret * getpagesize());
|
|
}
|
|
}
|
|
}
|
|
|
|
raw_probe_alignment(bs, s->fd, errp);
|
|
bs->bl.min_mem_alignment = s->buf_align;
|
|
bs->bl.opt_mem_alignment = MAX(s->buf_align, getpagesize());
|
|
}
|
|
|
|
static int check_for_dasd(int fd)
|
|
{
|
|
#ifdef BIODASDINFO2
|
|
struct dasd_information2_t info = {0};
|
|
|
|
return ioctl(fd, BIODASDINFO2, &info);
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Try to get @bs's logical and physical block size.
|
|
* On success, store them in @bsz and return zero.
|
|
* On failure, return negative errno.
|
|
*/
|
|
static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
/* If DASD, get blocksizes */
|
|
if (check_for_dasd(s->fd) < 0) {
|
|
return -ENOTSUP;
|
|
}
|
|
ret = probe_logical_blocksize(s->fd, &bsz->log);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
return probe_physical_blocksize(s->fd, &bsz->phys);
|
|
}
|
|
|
|
/**
|
|
* Try to get @bs's geometry: cyls, heads, sectors.
|
|
* On success, store them in @geo and return 0.
|
|
* On failure return -errno.
|
|
* (Allows block driver to assign default geometry values that guest sees)
|
|
*/
|
|
#ifdef __linux__
|
|
static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct hd_geometry ioctl_geo = {0};
|
|
|
|
/* If DASD, get its geometry */
|
|
if (check_for_dasd(s->fd) < 0) {
|
|
return -ENOTSUP;
|
|
}
|
|
if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) {
|
|
return -errno;
|
|
}
|
|
/* HDIO_GETGEO may return success even though geo contains zeros
|
|
(e.g. certain multipath setups) */
|
|
if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) {
|
|
return -ENOTSUP;
|
|
}
|
|
/* Do not return a geometry for partition */
|
|
if (ioctl_geo.start != 0) {
|
|
return -ENOTSUP;
|
|
}
|
|
geo->heads = ioctl_geo.heads;
|
|
geo->sectors = ioctl_geo.sectors;
|
|
geo->cylinders = ioctl_geo.cylinders;
|
|
|
|
return 0;
|
|
}
|
|
#else /* __linux__ */
|
|
static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
|
|
{
|
|
return -ENOTSUP;
|
|
}
|
|
#endif
|
|
|
|
#if defined(__linux__)
|
|
static int handle_aiocb_ioctl(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
int ret;
|
|
|
|
ret = ioctl(aiocb->aio_fildes, aiocb->ioctl.cmd, aiocb->ioctl.buf);
|
|
if (ret == -1) {
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* linux */
|
|
|
|
static int handle_aiocb_flush(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
BDRVRawState *s = aiocb->bs->opaque;
|
|
int ret;
|
|
|
|
if (s->page_cache_inconsistent) {
|
|
return -EIO;
|
|
}
|
|
|
|
ret = qemu_fdatasync(aiocb->aio_fildes);
|
|
if (ret == -1) {
|
|
/* There is no clear definition of the semantics of a failing fsync(),
|
|
* so we may have to assume the worst. The sad truth is that this
|
|
* assumption is correct for Linux. Some pages are now probably marked
|
|
* clean in the page cache even though they are inconsistent with the
|
|
* on-disk contents. The next fdatasync() call would succeed, but no
|
|
* further writeback attempt will be made. We can't get back to a state
|
|
* in which we know what is on disk (we would have to rewrite
|
|
* everything that was touched since the last fdatasync() at least), so
|
|
* make bdrv_flush() fail permanently. Given that the behaviour isn't
|
|
* really defined, I have little hope that other OSes are doing better.
|
|
*
|
|
* Obviously, this doesn't affect O_DIRECT, which bypasses the page
|
|
* cache. */
|
|
if ((s->open_flags & O_DIRECT) == 0) {
|
|
s->page_cache_inconsistent = true;
|
|
}
|
|
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->io.iov,
|
|
aiocb->io.niov,
|
|
aiocb->aio_offset);
|
|
else
|
|
len = qemu_preadv(aiocb->aio_fildes,
|
|
aiocb->io.iov,
|
|
aiocb->io.niov,
|
|
aiocb->aio_offset);
|
|
} while (len == -1 && errno == EINTR);
|
|
|
|
if (len == -1) {
|
|
return -errno;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Read/writes the data to/from a given linear buffer.
|
|
*
|
|
* Returns the number of bytes handles or -errno in case of an error. Short
|
|
* reads are only returned if the end of the file is reached.
|
|
*/
|
|
static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
|
|
{
|
|
ssize_t offset = 0;
|
|
ssize_t len;
|
|
|
|
while (offset < aiocb->aio_nbytes) {
|
|
if (aiocb->aio_type & QEMU_AIO_WRITE) {
|
|
len = pwrite(aiocb->aio_fildes,
|
|
(const char *)buf + offset,
|
|
aiocb->aio_nbytes - offset,
|
|
aiocb->aio_offset + offset);
|
|
} else {
|
|
len = pread(aiocb->aio_fildes,
|
|
buf + offset,
|
|
aiocb->aio_nbytes - offset,
|
|
aiocb->aio_offset + offset);
|
|
}
|
|
if (len == -1 && errno == EINTR) {
|
|
continue;
|
|
} else if (len == -1 && errno == EINVAL &&
|
|
(aiocb->bs->open_flags & BDRV_O_NOCACHE) &&
|
|
!(aiocb->aio_type & QEMU_AIO_WRITE) &&
|
|
offset > 0) {
|
|
/* O_DIRECT pread() may fail with EINVAL when offset is unaligned
|
|
* after a short read. Assume that O_DIRECT short reads only occur
|
|
* at EOF. Therefore this is a short read, not an I/O error.
|
|
*/
|
|
break;
|
|
} else if (len == -1) {
|
|
offset = -errno;
|
|
break;
|
|
} else if (len == 0) {
|
|
break;
|
|
}
|
|
offset += len;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int handle_aiocb_rw(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
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->io.niov == 1) {
|
|
nbytes = handle_aiocb_rw_linear(aiocb, aiocb->io.iov->iov_base);
|
|
goto out;
|
|
}
|
|
/*
|
|
* 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)) {
|
|
goto out;
|
|
}
|
|
preadv_present = false;
|
|
}
|
|
|
|
/*
|
|
* XXX(hch): short read/write. no easy way to handle the reminder
|
|
* using these interfaces. For now retry using plain
|
|
* pread/pwrite?
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Ok, we have to do it the hard way, copy all segments into
|
|
* a single aligned buffer.
|
|
*/
|
|
buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes);
|
|
if (buf == NULL) {
|
|
nbytes = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (aiocb->aio_type & QEMU_AIO_WRITE) {
|
|
char *p = buf;
|
|
int i;
|
|
|
|
for (i = 0; i < aiocb->io.niov; ++i) {
|
|
memcpy(p, aiocb->io.iov[i].iov_base, aiocb->io.iov[i].iov_len);
|
|
p += aiocb->io.iov[i].iov_len;
|
|
}
|
|
assert(p - buf == aiocb->aio_nbytes);
|
|
}
|
|
|
|
nbytes = handle_aiocb_rw_linear(aiocb, buf);
|
|
if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
|
|
char *p = buf;
|
|
size_t count = aiocb->aio_nbytes, copy;
|
|
int i;
|
|
|
|
for (i = 0; i < aiocb->io.niov && count; ++i) {
|
|
copy = count;
|
|
if (copy > aiocb->io.iov[i].iov_len) {
|
|
copy = aiocb->io.iov[i].iov_len;
|
|
}
|
|
memcpy(aiocb->io.iov[i].iov_base, p, copy);
|
|
assert(count >= copy);
|
|
p += copy;
|
|
count -= copy;
|
|
}
|
|
assert(count == 0);
|
|
}
|
|
qemu_vfree(buf);
|
|
|
|
out:
|
|
if (nbytes == aiocb->aio_nbytes) {
|
|
return 0;
|
|
} else if (nbytes >= 0 && nbytes < aiocb->aio_nbytes) {
|
|
if (aiocb->aio_type & QEMU_AIO_WRITE) {
|
|
return -EINVAL;
|
|
} else {
|
|
iov_memset(aiocb->io.iov, aiocb->io.niov, nbytes,
|
|
0, aiocb->aio_nbytes - nbytes);
|
|
return 0;
|
|
}
|
|
} else {
|
|
assert(nbytes < 0);
|
|
return nbytes;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_XFS
|
|
static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
|
|
{
|
|
int64_t len;
|
|
struct xfs_flock64 fl;
|
|
int err;
|
|
|
|
len = lseek(s->fd, 0, SEEK_END);
|
|
if (len < 0) {
|
|
return -errno;
|
|
}
|
|
|
|
if (offset + bytes > len) {
|
|
/* XFS_IOC_ZERO_RANGE does not increase the file length */
|
|
if (ftruncate(s->fd, offset + bytes) < 0) {
|
|
return -errno;
|
|
}
|
|
}
|
|
|
|
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) {
|
|
err = errno;
|
|
trace_file_xfs_write_zeroes(strerror(errno));
|
|
return -err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
|
|
{
|
|
struct xfs_flock64 fl;
|
|
int err;
|
|
|
|
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) {
|
|
err = errno;
|
|
trace_file_xfs_discard(strerror(errno));
|
|
return -err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int translate_err(int err)
|
|
{
|
|
if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP ||
|
|
err == -ENOTTY) {
|
|
err = -ENOTSUP;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_FALLOCATE
|
|
static int do_fallocate(int fd, int mode, off_t offset, off_t len)
|
|
{
|
|
do {
|
|
if (fallocate(fd, mode, offset, len) == 0) {
|
|
return 0;
|
|
}
|
|
} while (errno == EINTR);
|
|
return translate_err(-errno);
|
|
}
|
|
#endif
|
|
|
|
static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb)
|
|
{
|
|
int ret = -ENOTSUP;
|
|
BDRVRawState *s = aiocb->bs->opaque;
|
|
|
|
if (!s->has_write_zeroes) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
#ifdef BLKZEROOUT
|
|
/* The BLKZEROOUT implementation in the kernel doesn't set
|
|
* BLKDEV_ZERO_NOFALLBACK, so we can't call this if we have to avoid slow
|
|
* fallbacks. */
|
|
if (!(aiocb->aio_type & QEMU_AIO_NO_FALLBACK)) {
|
|
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 = translate_err(-errno);
|
|
}
|
|
#endif
|
|
|
|
if (ret == -ENOTSUP) {
|
|
s->has_write_zeroes = false;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int handle_aiocb_write_zeroes(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
#if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
|
|
BDRVRawState *s = aiocb->bs->opaque;
|
|
#endif
|
|
#ifdef CONFIG_FALLOCATE
|
|
int64_t len;
|
|
#endif
|
|
|
|
if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
|
|
return handle_aiocb_write_zeroes_block(aiocb);
|
|
}
|
|
|
|
#ifdef CONFIG_XFS
|
|
if (s->is_xfs) {
|
|
return xfs_write_zeroes(s, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FALLOCATE_ZERO_RANGE
|
|
if (s->has_write_zeroes) {
|
|
int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE,
|
|
aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0 || ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
s->has_write_zeroes = false;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
|
|
if (s->has_discard && s->has_fallocate) {
|
|
int ret = do_fallocate(s->fd,
|
|
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
|
|
aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0) {
|
|
ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0 || ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
s->has_fallocate = false;
|
|
} else if (ret != -ENOTSUP) {
|
|
return ret;
|
|
} else {
|
|
s->has_discard = false;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FALLOCATE
|
|
/* Last resort: we are trying to extend the file with zeroed data. This
|
|
* can be done via fallocate(fd, 0) */
|
|
len = bdrv_getlength(aiocb->bs);
|
|
if (s->has_fallocate && len >= 0 && aiocb->aio_offset >= len) {
|
|
int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0 || ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
s->has_fallocate = false;
|
|
}
|
|
#endif
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
static int handle_aiocb_write_zeroes_unmap(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
BDRVRawState *s G_GNUC_UNUSED = aiocb->bs->opaque;
|
|
int ret;
|
|
|
|
/* First try to write zeros and unmap at the same time */
|
|
|
|
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
|
|
ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
|
|
aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_XFS
|
|
if (s->is_xfs) {
|
|
/* xfs_discard() guarantees that the discarded area reads as all-zero
|
|
* afterwards, so we can use it here. */
|
|
return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
}
|
|
#endif
|
|
|
|
/* If we couldn't manage to unmap while guaranteed that the area reads as
|
|
* all-zero afterwards, just write zeroes without unmapping */
|
|
ret = handle_aiocb_write_zeroes(aiocb);
|
|
return ret;
|
|
}
|
|
|
|
#ifndef HAVE_COPY_FILE_RANGE
|
|
static off_t copy_file_range(int in_fd, off_t *in_off, int out_fd,
|
|
off_t *out_off, size_t len, unsigned int flags)
|
|
{
|
|
#ifdef __NR_copy_file_range
|
|
return syscall(__NR_copy_file_range, in_fd, in_off, out_fd,
|
|
out_off, len, flags);
|
|
#else
|
|
errno = ENOSYS;
|
|
return -1;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
static int handle_aiocb_copy_range(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
uint64_t bytes = aiocb->aio_nbytes;
|
|
off_t in_off = aiocb->aio_offset;
|
|
off_t out_off = aiocb->copy_range.aio_offset2;
|
|
|
|
while (bytes) {
|
|
ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off,
|
|
aiocb->copy_range.aio_fd2, &out_off,
|
|
bytes, 0);
|
|
trace_file_copy_file_range(aiocb->bs, aiocb->aio_fildes, in_off,
|
|
aiocb->copy_range.aio_fd2, out_off, bytes,
|
|
0, ret);
|
|
if (ret == 0) {
|
|
/* No progress (e.g. when beyond EOF), let the caller fall back to
|
|
* buffer I/O. */
|
|
return -ENOSPC;
|
|
}
|
|
if (ret < 0) {
|
|
switch (errno) {
|
|
case ENOSYS:
|
|
return -ENOTSUP;
|
|
case EINTR:
|
|
continue;
|
|
default:
|
|
return -errno;
|
|
}
|
|
}
|
|
bytes -= ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int handle_aiocb_discard(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
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
|
|
ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
|
|
aiocb->aio_offset, aiocb->aio_nbytes);
|
|
#endif
|
|
}
|
|
|
|
ret = translate_err(ret);
|
|
if (ret == -ENOTSUP) {
|
|
s->has_discard = false;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int handle_aiocb_truncate(void *opaque)
|
|
{
|
|
RawPosixAIOData *aiocb = opaque;
|
|
int result = 0;
|
|
int64_t current_length = 0;
|
|
char *buf = NULL;
|
|
struct stat st;
|
|
int fd = aiocb->aio_fildes;
|
|
int64_t offset = aiocb->aio_offset;
|
|
PreallocMode prealloc = aiocb->truncate.prealloc;
|
|
Error **errp = aiocb->truncate.errp;
|
|
|
|
if (fstat(fd, &st) < 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not stat file");
|
|
return result;
|
|
}
|
|
|
|
current_length = st.st_size;
|
|
if (current_length > offset && prealloc != PREALLOC_MODE_OFF) {
|
|
error_setg(errp, "Cannot use preallocation for shrinking files");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
switch (prealloc) {
|
|
#ifdef CONFIG_POSIX_FALLOCATE
|
|
case PREALLOC_MODE_FALLOC:
|
|
/*
|
|
* Truncating before posix_fallocate() makes it about twice slower on
|
|
* file systems that do not support fallocate(), trying to check if a
|
|
* block is allocated before allocating it, so don't do that here.
|
|
*/
|
|
if (offset != current_length) {
|
|
result = -posix_fallocate(fd, current_length,
|
|
offset - current_length);
|
|
if (result != 0) {
|
|
/* posix_fallocate() doesn't set errno. */
|
|
error_setg_errno(errp, -result,
|
|
"Could not preallocate new data");
|
|
}
|
|
} else {
|
|
result = 0;
|
|
}
|
|
goto out;
|
|
#endif
|
|
case PREALLOC_MODE_FULL:
|
|
{
|
|
int64_t num = 0, left = offset - current_length;
|
|
off_t seek_result;
|
|
|
|
/*
|
|
* Knowing the final size from the beginning could allow the file
|
|
* system driver to do less allocations and possibly avoid
|
|
* fragmentation of the file.
|
|
*/
|
|
if (ftruncate(fd, offset) != 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not resize file");
|
|
goto out;
|
|
}
|
|
|
|
buf = g_malloc0(65536);
|
|
|
|
seek_result = lseek(fd, current_length, SEEK_SET);
|
|
if (seek_result < 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result,
|
|
"Failed to seek to the old end of file");
|
|
goto out;
|
|
}
|
|
|
|
while (left > 0) {
|
|
num = MIN(left, 65536);
|
|
result = write(fd, buf, num);
|
|
if (result < 0) {
|
|
if (errno == EINTR) {
|
|
continue;
|
|
}
|
|
result = -errno;
|
|
error_setg_errno(errp, -result,
|
|
"Could not write zeros for preallocation");
|
|
goto out;
|
|
}
|
|
left -= result;
|
|
}
|
|
if (result >= 0) {
|
|
result = fsync(fd);
|
|
if (result < 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result,
|
|
"Could not flush file to disk");
|
|
goto out;
|
|
}
|
|
}
|
|
goto out;
|
|
}
|
|
case PREALLOC_MODE_OFF:
|
|
if (ftruncate(fd, offset) != 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not resize file");
|
|
}
|
|
return result;
|
|
default:
|
|
result = -ENOTSUP;
|
|
error_setg(errp, "Unsupported preallocation mode: %s",
|
|
PreallocMode_str(prealloc));
|
|
return result;
|
|
}
|
|
|
|
out:
|
|
if (result < 0) {
|
|
if (ftruncate(fd, current_length) < 0) {
|
|
error_report("Failed to restore old file length: %s",
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
g_free(buf);
|
|
return result;
|
|
}
|
|
|
|
static int coroutine_fn raw_thread_pool_submit(BlockDriverState *bs,
|
|
ThreadPoolFunc func, void *arg)
|
|
{
|
|
/* @bs can be NULL, bdrv_get_aio_context() returns the main context then */
|
|
ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
|
|
return thread_pool_submit_co(pool, func, arg);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov, int type)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
RawPosixAIOData acb;
|
|
|
|
if (fd_open(bs) < 0)
|
|
return -EIO;
|
|
|
|
/*
|
|
* Check if the underlying device requires requests to be aligned,
|
|
* and if the request we are trying to submit is aligned or not.
|
|
* If this is the case tell the low-level driver that it needs
|
|
* to copy the buffer.
|
|
*/
|
|
if (s->needs_alignment) {
|
|
if (!bdrv_qiov_is_aligned(bs, qiov)) {
|
|
type |= QEMU_AIO_MISALIGNED;
|
|
#ifdef CONFIG_LINUX_AIO
|
|
} else if (s->use_linux_aio) {
|
|
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
|
|
assert(qiov->size == bytes);
|
|
return laio_co_submit(bs, aio, s->fd, offset, qiov, type);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
acb = (RawPosixAIOData) {
|
|
.bs = bs,
|
|
.aio_fildes = s->fd,
|
|
.aio_type = type,
|
|
.aio_offset = offset,
|
|
.aio_nbytes = bytes,
|
|
.io = {
|
|
.iov = qiov->iov,
|
|
.niov = qiov->niov,
|
|
},
|
|
};
|
|
|
|
assert(qiov->size == bytes);
|
|
return raw_thread_pool_submit(bs, handle_aiocb_rw, &acb);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov,
|
|
int flags)
|
|
{
|
|
return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_READ);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov,
|
|
int flags)
|
|
{
|
|
assert(flags == 0);
|
|
return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_WRITE);
|
|
}
|
|
|
|
static void raw_aio_plug(BlockDriverState *bs)
|
|
{
|
|
#ifdef CONFIG_LINUX_AIO
|
|
BDRVRawState *s = bs->opaque;
|
|
if (s->use_linux_aio) {
|
|
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
|
|
laio_io_plug(bs, aio);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void raw_aio_unplug(BlockDriverState *bs)
|
|
{
|
|
#ifdef CONFIG_LINUX_AIO
|
|
BDRVRawState *s = bs->opaque;
|
|
if (s->use_linux_aio) {
|
|
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
|
|
laio_io_unplug(bs, aio);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int raw_co_flush_to_disk(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
RawPosixAIOData acb;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
acb = (RawPosixAIOData) {
|
|
.bs = bs,
|
|
.aio_fildes = s->fd,
|
|
.aio_type = QEMU_AIO_FLUSH,
|
|
};
|
|
|
|
return raw_thread_pool_submit(bs, handle_aiocb_flush, &acb);
|
|
}
|
|
|
|
static void raw_aio_attach_aio_context(BlockDriverState *bs,
|
|
AioContext *new_context)
|
|
{
|
|
#ifdef CONFIG_LINUX_AIO
|
|
BDRVRawState *s = bs->opaque;
|
|
if (s->use_linux_aio) {
|
|
Error *local_err;
|
|
if (!aio_setup_linux_aio(new_context, &local_err)) {
|
|
error_reportf_err(local_err, "Unable to use native AIO, "
|
|
"falling back to thread pool: ");
|
|
s->use_linux_aio = false;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void raw_close(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (s->fd >= 0) {
|
|
qemu_close(s->fd);
|
|
s->fd = -1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Truncates the given regular file @fd to @offset and, when growing, fills the
|
|
* new space according to @prealloc.
|
|
*
|
|
* Returns: 0 on success, -errno on failure.
|
|
*/
|
|
static int coroutine_fn
|
|
raw_regular_truncate(BlockDriverState *bs, int fd, int64_t offset,
|
|
PreallocMode prealloc, Error **errp)
|
|
{
|
|
RawPosixAIOData acb;
|
|
|
|
acb = (RawPosixAIOData) {
|
|
.bs = bs,
|
|
.aio_fildes = fd,
|
|
.aio_type = QEMU_AIO_TRUNCATE,
|
|
.aio_offset = offset,
|
|
.truncate = {
|
|
.prealloc = prealloc,
|
|
.errp = errp,
|
|
},
|
|
};
|
|
|
|
return raw_thread_pool_submit(bs, handle_aiocb_truncate, &acb);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
|
|
PreallocMode prealloc, Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct stat st;
|
|
int ret;
|
|
|
|
if (fstat(s->fd, &st)) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, -ret, "Failed to fstat() the file");
|
|
return ret;
|
|
}
|
|
|
|
if (S_ISREG(st.st_mode)) {
|
|
return raw_regular_truncate(bs, s->fd, offset, prealloc, errp);
|
|
}
|
|
|
|
if (prealloc != PREALLOC_MODE_OFF) {
|
|
error_setg(errp, "Preallocation mode '%s' unsupported for this "
|
|
"non-regular file", PreallocMode_str(prealloc));
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
if (offset > raw_getlength(bs)) {
|
|
error_setg(errp, "Cannot grow device files");
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
error_setg(errp, "Resizing this file is not supported");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef __OpenBSD__
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd = s->fd;
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st))
|
|
return -errno;
|
|
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
struct disklabel dl;
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dl))
|
|
return -errno;
|
|
return (uint64_t)dl.d_secsize *
|
|
dl.d_partitions[DISKPART(st.st_rdev)].p_size;
|
|
} else
|
|
return st.st_size;
|
|
}
|
|
#elif defined(__NetBSD__)
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd = s->fd;
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st))
|
|
return -errno;
|
|
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
struct dkwedge_info dkw;
|
|
|
|
if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
|
|
return dkw.dkw_size * 512;
|
|
} else {
|
|
struct disklabel dl;
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dl))
|
|
return -errno;
|
|
return (uint64_t)dl.d_secsize *
|
|
dl.d_partitions[DISKPART(st.st_rdev)].p_size;
|
|
}
|
|
} else
|
|
return st.st_size;
|
|
}
|
|
#elif defined(__sun__)
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct dk_minfo minfo;
|
|
int ret;
|
|
int64_t size;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Use the DKIOCGMEDIAINFO ioctl to read the size.
|
|
*/
|
|
ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
|
|
if (ret != -1) {
|
|
return minfo.dki_lbsize * minfo.dki_capacity;
|
|
}
|
|
|
|
/*
|
|
* There are reports that lseek on some devices fails, but
|
|
* irc discussion said that contingency on contingency was overkill.
|
|
*/
|
|
size = lseek(s->fd, 0, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
return size;
|
|
}
|
|
#elif defined(CONFIG_BSD)
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd = s->fd;
|
|
int64_t size;
|
|
struct stat sb;
|
|
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
int reopened = 0;
|
|
#endif
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
again:
|
|
#endif
|
|
if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
|
|
#ifdef DIOCGMEDIASIZE
|
|
if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
|
|
#elif defined(DIOCGPART)
|
|
{
|
|
struct partinfo pi;
|
|
if (ioctl(fd, DIOCGPART, &pi) == 0)
|
|
size = pi.media_size;
|
|
else
|
|
size = 0;
|
|
}
|
|
if (size == 0)
|
|
#endif
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
{
|
|
uint64_t sectors = 0;
|
|
uint32_t sector_size = 0;
|
|
|
|
if (ioctl(fd, DKIOCGETBLOCKCOUNT, §ors) == 0
|
|
&& ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == 0) {
|
|
size = sectors * sector_size;
|
|
} else {
|
|
size = lseek(fd, 0LL, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
size = lseek(fd, 0LL, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
#endif
|
|
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
switch(s->type) {
|
|
case FTYPE_CD:
|
|
/* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
|
|
if (size == 2048LL * (unsigned)-1)
|
|
size = 0;
|
|
/* XXX no disc? maybe we need to reopen... */
|
|
if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
|
|
reopened = 1;
|
|
goto again;
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
size = lseek(fd, 0, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
#else
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
int64_t size;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
size = lseek(s->fd, 0, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
return size;
|
|
}
|
|
#endif
|
|
|
|
static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
|
|
{
|
|
struct stat st;
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (fstat(s->fd, &st) < 0) {
|
|
return -errno;
|
|
}
|
|
return (int64_t)st.st_blocks * 512;
|
|
}
|
|
|
|
static int coroutine_fn
|
|
raw_co_create(BlockdevCreateOptions *options, Error **errp)
|
|
{
|
|
BlockdevCreateOptionsFile *file_opts;
|
|
Error *local_err = NULL;
|
|
int fd;
|
|
uint64_t perm, shared;
|
|
int result = 0;
|
|
|
|
/* Validate options and set default values */
|
|
assert(options->driver == BLOCKDEV_DRIVER_FILE);
|
|
file_opts = &options->u.file;
|
|
|
|
if (!file_opts->has_nocow) {
|
|
file_opts->nocow = false;
|
|
}
|
|
if (!file_opts->has_preallocation) {
|
|
file_opts->preallocation = PREALLOC_MODE_OFF;
|
|
}
|
|
|
|
/* Create file */
|
|
fd = qemu_open(file_opts->filename, O_RDWR | O_CREAT | O_BINARY, 0644);
|
|
if (fd < 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not create file");
|
|
goto out;
|
|
}
|
|
|
|
/* Take permissions: We want to discard everything, so we need
|
|
* BLK_PERM_WRITE; and truncation to the desired size requires
|
|
* BLK_PERM_RESIZE.
|
|
* On the other hand, we cannot share the RESIZE permission
|
|
* because we promise that after this function, the file has the
|
|
* size given in the options. If someone else were to resize it
|
|
* concurrently, we could not guarantee that.
|
|
* Note that after this function, we can no longer guarantee that
|
|
* the file is not touched by a third party, so it may be resized
|
|
* then. */
|
|
perm = BLK_PERM_WRITE | BLK_PERM_RESIZE;
|
|
shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE;
|
|
|
|
/* Step one: Take locks */
|
|
result = raw_apply_lock_bytes(NULL, fd, perm, ~shared, false, errp);
|
|
if (result < 0) {
|
|
goto out_close;
|
|
}
|
|
|
|
/* Step two: Check that nobody else has taken conflicting locks */
|
|
result = raw_check_lock_bytes(fd, perm, shared, errp);
|
|
if (result < 0) {
|
|
error_append_hint(errp,
|
|
"Is another process using the image [%s]?\n",
|
|
file_opts->filename);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Clear the file by truncating it to 0 */
|
|
result = raw_regular_truncate(NULL, fd, 0, PREALLOC_MODE_OFF, errp);
|
|
if (result < 0) {
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (file_opts->nocow) {
|
|
#ifdef __linux__
|
|
/* Set NOCOW flag to solve performance issue on fs like btrfs.
|
|
* This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
|
|
* will be ignored since any failure of this operation should not
|
|
* block the left work.
|
|
*/
|
|
int attr;
|
|
if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) {
|
|
attr |= FS_NOCOW_FL;
|
|
ioctl(fd, FS_IOC_SETFLAGS, &attr);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Resize and potentially preallocate the file to the desired
|
|
* final size */
|
|
result = raw_regular_truncate(NULL, fd, file_opts->size,
|
|
file_opts->preallocation, errp);
|
|
if (result < 0) {
|
|
goto out_unlock;
|
|
}
|
|
|
|
out_unlock:
|
|
raw_apply_lock_bytes(NULL, fd, 0, 0, true, &local_err);
|
|
if (local_err) {
|
|
/* The above call should not fail, and if it does, that does
|
|
* not mean the whole creation operation has failed. So
|
|
* report it the user for their convenience, but do not report
|
|
* it to the caller. */
|
|
warn_report_err(local_err);
|
|
}
|
|
|
|
out_close:
|
|
if (qemu_close(fd) != 0 && result == 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not close the new file");
|
|
}
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
static int coroutine_fn raw_co_create_opts(const char *filename, QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
BlockdevCreateOptions options;
|
|
int64_t total_size = 0;
|
|
bool nocow = false;
|
|
PreallocMode prealloc;
|
|
char *buf = NULL;
|
|
Error *local_err = NULL;
|
|
|
|
/* Skip file: protocol prefix */
|
|
strstart(filename, "file:", &filename);
|
|
|
|
/* Read out options */
|
|
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
|
|
BDRV_SECTOR_SIZE);
|
|
nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false);
|
|
buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
|
|
prealloc = qapi_enum_parse(&PreallocMode_lookup, buf,
|
|
PREALLOC_MODE_OFF, &local_err);
|
|
g_free(buf);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return -EINVAL;
|
|
}
|
|
|
|
options = (BlockdevCreateOptions) {
|
|
.driver = BLOCKDEV_DRIVER_FILE,
|
|
.u.file = {
|
|
.filename = (char *) filename,
|
|
.size = total_size,
|
|
.has_preallocation = true,
|
|
.preallocation = prealloc,
|
|
.has_nocow = true,
|
|
.nocow = nocow,
|
|
},
|
|
};
|
|
return raw_co_create(&options, errp);
|
|
}
|
|
|
|
/*
|
|
* Find allocation range in @bs around offset @start.
|
|
* May change underlying file descriptor's file offset.
|
|
* If @start is not in a hole, store @start in @data, and the
|
|
* beginning of the next hole in @hole, and return 0.
|
|
* If @start is in a non-trailing hole, store @start in @hole and the
|
|
* beginning of the next non-hole in @data, and return 0.
|
|
* If @start is in a trailing hole or beyond EOF, return -ENXIO.
|
|
* If we can't find out, return a negative errno other than -ENXIO.
|
|
*/
|
|
static int find_allocation(BlockDriverState *bs, off_t start,
|
|
off_t *data, off_t *hole)
|
|
{
|
|
#if defined SEEK_HOLE && defined SEEK_DATA
|
|
BDRVRawState *s = bs->opaque;
|
|
off_t offs;
|
|
|
|
/*
|
|
* SEEK_DATA cases:
|
|
* D1. offs == start: start is in data
|
|
* D2. offs > start: start is in a hole, next data at offs
|
|
* D3. offs < 0, errno = ENXIO: either start is in a trailing hole
|
|
* or start is beyond EOF
|
|
* If the latter happens, the file has been truncated behind
|
|
* our back since we opened it. All bets are off then.
|
|
* Treating like a trailing hole is simplest.
|
|
* D4. offs < 0, errno != ENXIO: we learned nothing
|
|
*/
|
|
offs = lseek(s->fd, start, SEEK_DATA);
|
|
if (offs < 0) {
|
|
return -errno; /* D3 or D4 */
|
|
}
|
|
|
|
if (offs < start) {
|
|
/* This is not a valid return by lseek(). We are safe to just return
|
|
* -EIO in this case, and we'll treat it like D4. */
|
|
return -EIO;
|
|
}
|
|
|
|
if (offs > start) {
|
|
/* D2: in hole, next data at offs */
|
|
*hole = start;
|
|
*data = offs;
|
|
return 0;
|
|
}
|
|
|
|
/* D1: in data, end not yet known */
|
|
|
|
/*
|
|
* SEEK_HOLE cases:
|
|
* H1. offs == start: start is in a hole
|
|
* If this happens here, a hole has been dug behind our back
|
|
* since the previous lseek().
|
|
* H2. offs > start: either start is in data, next hole at offs,
|
|
* or start is in trailing hole, EOF at offs
|
|
* Linux treats trailing holes like any other hole: offs ==
|
|
* start. Solaris seeks to EOF instead: offs > start (blech).
|
|
* If that happens here, a hole has been dug behind our back
|
|
* since the previous lseek().
|
|
* H3. offs < 0, errno = ENXIO: start is beyond EOF
|
|
* If this happens, the file has been truncated behind our
|
|
* back since we opened it. Treat it like a trailing hole.
|
|
* H4. offs < 0, errno != ENXIO: we learned nothing
|
|
* Pretend we know nothing at all, i.e. "forget" about D1.
|
|
*/
|
|
offs = lseek(s->fd, start, SEEK_HOLE);
|
|
if (offs < 0) {
|
|
return -errno; /* D1 and (H3 or H4) */
|
|
}
|
|
|
|
if (offs < start) {
|
|
/* This is not a valid return by lseek(). We are safe to just return
|
|
* -EIO in this case, and we'll treat it like H4. */
|
|
return -EIO;
|
|
}
|
|
|
|
if (offs > start) {
|
|
/*
|
|
* D1 and H2: either in data, next hole at offs, or it was in
|
|
* data but is now in a trailing hole. In the latter case,
|
|
* all bets are off. Treating it as if it there was data all
|
|
* the way to EOF is safe, so simply do that.
|
|
*/
|
|
*data = start;
|
|
*hole = offs;
|
|
return 0;
|
|
}
|
|
|
|
/* D1 and H1 */
|
|
return -EBUSY;
|
|
#else
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Returns the allocation status of the specified offset.
|
|
*
|
|
* The block layer guarantees 'offset' and 'bytes' are within bounds.
|
|
*
|
|
* 'pnum' is set to the number of bytes (including and immediately following
|
|
* the specified offset) that are known to be in the same
|
|
* allocated/unallocated state.
|
|
*
|
|
* 'bytes' is the max value 'pnum' should be set to.
|
|
*/
|
|
static int coroutine_fn raw_co_block_status(BlockDriverState *bs,
|
|
bool want_zero,
|
|
int64_t offset,
|
|
int64_t bytes, int64_t *pnum,
|
|
int64_t *map,
|
|
BlockDriverState **file)
|
|
{
|
|
off_t data = 0, hole = 0;
|
|
int ret;
|
|
|
|
assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if (!want_zero) {
|
|
*pnum = bytes;
|
|
*map = offset;
|
|
*file = bs;
|
|
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
|
|
}
|
|
|
|
ret = find_allocation(bs, offset, &data, &hole);
|
|
if (ret == -ENXIO) {
|
|
/* Trailing hole */
|
|
*pnum = bytes;
|
|
ret = BDRV_BLOCK_ZERO;
|
|
} else if (ret < 0) {
|
|
/* No info available, so pretend there are no holes */
|
|
*pnum = bytes;
|
|
ret = BDRV_BLOCK_DATA;
|
|
} else if (data == offset) {
|
|
/* On a data extent, compute bytes to the end of the extent,
|
|
* possibly including a partial sector at EOF. */
|
|
*pnum = MIN(bytes, hole - offset);
|
|
|
|
/*
|
|
* We are not allowed to return partial sectors, though, so
|
|
* round up if necessary.
|
|
*/
|
|
if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) {
|
|
int64_t file_length = raw_getlength(bs);
|
|
if (file_length > 0) {
|
|
/* Ignore errors, this is just a safeguard */
|
|
assert(hole == file_length);
|
|
}
|
|
*pnum = ROUND_UP(*pnum, bs->bl.request_alignment);
|
|
}
|
|
|
|
ret = BDRV_BLOCK_DATA;
|
|
} else {
|
|
/* On a hole, compute bytes to the beginning of the next extent. */
|
|
assert(hole == offset);
|
|
*pnum = MIN(bytes, data - offset);
|
|
ret = BDRV_BLOCK_ZERO;
|
|
}
|
|
*map = offset;
|
|
*file = bs;
|
|
return ret | BDRV_BLOCK_OFFSET_VALID;
|
|
}
|
|
|
|
#if defined(__linux__)
|
|
/* Verify that the file is not in the page cache */
|
|
static void check_cache_dropped(BlockDriverState *bs, Error **errp)
|
|
{
|
|
const size_t window_size = 128 * 1024 * 1024;
|
|
BDRVRawState *s = bs->opaque;
|
|
void *window = NULL;
|
|
size_t length = 0;
|
|
unsigned char *vec;
|
|
size_t page_size;
|
|
off_t offset;
|
|
off_t end;
|
|
|
|
/* mincore(2) page status information requires 1 byte per page */
|
|
page_size = sysconf(_SC_PAGESIZE);
|
|
vec = g_malloc(DIV_ROUND_UP(window_size, page_size));
|
|
|
|
end = raw_getlength(bs);
|
|
|
|
for (offset = 0; offset < end; offset += window_size) {
|
|
void *new_window;
|
|
size_t new_length;
|
|
size_t vec_end;
|
|
size_t i;
|
|
int ret;
|
|
|
|
/* Unmap previous window if size has changed */
|
|
new_length = MIN(end - offset, window_size);
|
|
if (new_length != length) {
|
|
munmap(window, length);
|
|
window = NULL;
|
|
length = 0;
|
|
}
|
|
|
|
new_window = mmap(window, new_length, PROT_NONE, MAP_PRIVATE,
|
|
s->fd, offset);
|
|
if (new_window == MAP_FAILED) {
|
|
error_setg_errno(errp, errno, "mmap failed");
|
|
break;
|
|
}
|
|
|
|
window = new_window;
|
|
length = new_length;
|
|
|
|
ret = mincore(window, length, vec);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, errno, "mincore failed");
|
|
break;
|
|
}
|
|
|
|
vec_end = DIV_ROUND_UP(length, page_size);
|
|
for (i = 0; i < vec_end; i++) {
|
|
if (vec[i] & 0x1) {
|
|
error_setg(errp, "page cache still in use!");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (window) {
|
|
munmap(window, length);
|
|
}
|
|
|
|
g_free(vec);
|
|
}
|
|
#endif /* __linux__ */
|
|
|
|
static void coroutine_fn raw_co_invalidate_cache(BlockDriverState *bs,
|
|
Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "The file descriptor is not open");
|
|
return;
|
|
}
|
|
|
|
if (!s->drop_cache) {
|
|
return;
|
|
}
|
|
|
|
if (s->open_flags & O_DIRECT) {
|
|
return; /* No host kernel page cache */
|
|
}
|
|
|
|
#if defined(__linux__)
|
|
/* This sets the scene for the next syscall... */
|
|
ret = bdrv_co_flush(bs);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "flush failed");
|
|
return;
|
|
}
|
|
|
|
/* Linux does not invalidate pages that are dirty, locked, or mmapped by a
|
|
* process. These limitations are okay because we just fsynced the file,
|
|
* we don't use mmap, and the file should not be in use by other processes.
|
|
*/
|
|
ret = posix_fadvise(s->fd, 0, 0, POSIX_FADV_DONTNEED);
|
|
if (ret != 0) { /* the return value is a positive errno */
|
|
error_setg_errno(errp, ret, "fadvise failed");
|
|
return;
|
|
}
|
|
|
|
if (s->check_cache_dropped) {
|
|
check_cache_dropped(bs, errp);
|
|
}
|
|
#else /* __linux__ */
|
|
/* Do nothing. Live migration to a remote host with cache.direct=off is
|
|
* unsupported on other host operating systems. Cache consistency issues
|
|
* may occur but no error is reported here, partly because that's the
|
|
* historical behavior and partly because it's hard to differentiate valid
|
|
* configurations that should not cause errors.
|
|
*/
|
|
#endif /* !__linux__ */
|
|
}
|
|
|
|
static coroutine_fn int
|
|
raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int bytes, bool blkdev)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
RawPosixAIOData acb;
|
|
|
|
acb = (RawPosixAIOData) {
|
|
.bs = bs,
|
|
.aio_fildes = s->fd,
|
|
.aio_type = QEMU_AIO_DISCARD,
|
|
.aio_offset = offset,
|
|
.aio_nbytes = bytes,
|
|
};
|
|
|
|
if (blkdev) {
|
|
acb.aio_type |= QEMU_AIO_BLKDEV;
|
|
}
|
|
|
|
return raw_thread_pool_submit(bs, handle_aiocb_discard, &acb);
|
|
}
|
|
|
|
static coroutine_fn int
|
|
raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
|
|
{
|
|
return raw_do_pdiscard(bs, offset, bytes, false);
|
|
}
|
|
|
|
static int coroutine_fn
|
|
raw_do_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int bytes,
|
|
BdrvRequestFlags flags, bool blkdev)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
RawPosixAIOData acb;
|
|
ThreadPoolFunc *handler;
|
|
|
|
acb = (RawPosixAIOData) {
|
|
.bs = bs,
|
|
.aio_fildes = s->fd,
|
|
.aio_type = QEMU_AIO_WRITE_ZEROES,
|
|
.aio_offset = offset,
|
|
.aio_nbytes = bytes,
|
|
};
|
|
|
|
if (blkdev) {
|
|
acb.aio_type |= QEMU_AIO_BLKDEV;
|
|
}
|
|
if (flags & BDRV_REQ_NO_FALLBACK) {
|
|
acb.aio_type |= QEMU_AIO_NO_FALLBACK;
|
|
}
|
|
|
|
if (flags & BDRV_REQ_MAY_UNMAP) {
|
|
acb.aio_type |= QEMU_AIO_DISCARD;
|
|
handler = handle_aiocb_write_zeroes_unmap;
|
|
} else {
|
|
handler = handle_aiocb_write_zeroes;
|
|
}
|
|
|
|
return raw_thread_pool_submit(bs, handler, &acb);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_pwrite_zeroes(
|
|
BlockDriverState *bs, int64_t offset,
|
|
int bytes, BdrvRequestFlags flags)
|
|
{
|
|
return raw_do_pwrite_zeroes(bs, offset, bytes, flags, false);
|
|
}
|
|
|
|
static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
bdi->unallocated_blocks_are_zero = s->discard_zeroes;
|
|
return 0;
|
|
}
|
|
|
|
static QemuOptsList raw_create_opts = {
|
|
.name = "raw-create-opts",
|
|
.head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_NOCOW,
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "Turn off copy-on-write (valid only on btrfs)"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_PREALLOC,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Preallocation mode (allowed values: off, falloc, full)"
|
|
},
|
|
{ /* end of list */ }
|
|
}
|
|
};
|
|
|
|
static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared,
|
|
Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
BDRVRawReopenState *rs = NULL;
|
|
int open_flags;
|
|
int ret;
|
|
|
|
if (s->perm_change_fd) {
|
|
/*
|
|
* In the context of reopen, this function may be called several times
|
|
* (directly and recursively while change permissions of the parent).
|
|
* This is even true for children that don't inherit from the original
|
|
* reopen node, so s->reopen_state is not set.
|
|
*
|
|
* Ignore all but the first call.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
if (s->reopen_state) {
|
|
/* We already have a new file descriptor to set permissions for */
|
|
assert(s->reopen_state->perm == perm);
|
|
assert(s->reopen_state->shared_perm == shared);
|
|
rs = s->reopen_state->opaque;
|
|
s->perm_change_fd = rs->fd;
|
|
} else {
|
|
/* We may need a new fd if auto-read-only switches the mode */
|
|
ret = raw_reconfigure_getfd(bs, bs->open_flags, &open_flags, perm,
|
|
false, errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (ret != s->fd) {
|
|
s->perm_change_fd = ret;
|
|
}
|
|
}
|
|
|
|
/* Prepare permissions on old fd to avoid conflicts between old and new,
|
|
* but keep everything locked that new will need. */
|
|
ret = raw_handle_perm_lock(bs, RAW_PL_PREPARE, perm, shared, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
/* Copy locks to the new fd */
|
|
if (s->perm_change_fd) {
|
|
ret = raw_apply_lock_bytes(NULL, s->perm_change_fd, perm, ~shared,
|
|
false, errp);
|
|
if (ret < 0) {
|
|
raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL);
|
|
goto fail;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
fail:
|
|
if (s->perm_change_fd && !s->reopen_state) {
|
|
qemu_close(s->perm_change_fd);
|
|
}
|
|
s->perm_change_fd = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void raw_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
/* For reopen, we have already switched to the new fd (.bdrv_set_perm is
|
|
* called after .bdrv_reopen_commit) */
|
|
if (s->perm_change_fd && s->fd != s->perm_change_fd) {
|
|
qemu_close(s->fd);
|
|
s->fd = s->perm_change_fd;
|
|
}
|
|
s->perm_change_fd = 0;
|
|
|
|
raw_handle_perm_lock(bs, RAW_PL_COMMIT, perm, shared, NULL);
|
|
s->perm = perm;
|
|
s->shared_perm = shared;
|
|
}
|
|
|
|
static void raw_abort_perm_update(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
/* For reopen, .bdrv_reopen_abort is called afterwards and will close
|
|
* the file descriptor. */
|
|
if (s->perm_change_fd && !s->reopen_state) {
|
|
qemu_close(s->perm_change_fd);
|
|
}
|
|
s->perm_change_fd = 0;
|
|
|
|
raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_copy_range_from(
|
|
BlockDriverState *bs, BdrvChild *src, uint64_t src_offset,
|
|
BdrvChild *dst, uint64_t dst_offset, uint64_t bytes,
|
|
BdrvRequestFlags read_flags, BdrvRequestFlags write_flags)
|
|
{
|
|
return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes,
|
|
read_flags, write_flags);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_copy_range_to(BlockDriverState *bs,
|
|
BdrvChild *src,
|
|
uint64_t src_offset,
|
|
BdrvChild *dst,
|
|
uint64_t dst_offset,
|
|
uint64_t bytes,
|
|
BdrvRequestFlags read_flags,
|
|
BdrvRequestFlags write_flags)
|
|
{
|
|
RawPosixAIOData acb;
|
|
BDRVRawState *s = bs->opaque;
|
|
BDRVRawState *src_s;
|
|
|
|
assert(dst->bs == bs);
|
|
if (src->bs->drv->bdrv_co_copy_range_to != raw_co_copy_range_to) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
src_s = src->bs->opaque;
|
|
if (fd_open(src->bs) < 0 || fd_open(dst->bs) < 0) {
|
|
return -EIO;
|
|
}
|
|
|
|
acb = (RawPosixAIOData) {
|
|
.bs = bs,
|
|
.aio_type = QEMU_AIO_COPY_RANGE,
|
|
.aio_fildes = src_s->fd,
|
|
.aio_offset = src_offset,
|
|
.aio_nbytes = bytes,
|
|
.copy_range = {
|
|
.aio_fd2 = s->fd,
|
|
.aio_offset2 = dst_offset,
|
|
},
|
|
};
|
|
|
|
return raw_thread_pool_submit(bs, handle_aiocb_copy_range, &acb);
|
|
}
|
|
|
|
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_co_create = raw_co_create,
|
|
.bdrv_co_create_opts = raw_co_create_opts,
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_co_block_status = raw_co_block_status,
|
|
.bdrv_co_invalidate_cache = raw_co_invalidate_cache,
|
|
.bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes,
|
|
|
|
.bdrv_co_preadv = raw_co_preadv,
|
|
.bdrv_co_pwritev = raw_co_pwritev,
|
|
.bdrv_co_flush_to_disk = raw_co_flush_to_disk,
|
|
.bdrv_co_pdiscard = raw_co_pdiscard,
|
|
.bdrv_co_copy_range_from = raw_co_copy_range_from,
|
|
.bdrv_co_copy_range_to = raw_co_copy_range_to,
|
|
.bdrv_refresh_limits = raw_refresh_limits,
|
|
.bdrv_io_plug = raw_aio_plug,
|
|
.bdrv_io_unplug = raw_aio_unplug,
|
|
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
|
|
|
|
.bdrv_co_truncate = raw_co_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_info = raw_get_info,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
.bdrv_check_perm = raw_check_perm,
|
|
.bdrv_set_perm = raw_set_perm,
|
|
.bdrv_abort_perm_update = raw_abort_perm_update,
|
|
.create_opts = &raw_create_opts,
|
|
.mutable_opts = mutable_opts,
|
|
};
|
|
|
|
/***********************************************/
|
|
/* host device */
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
|
|
CFIndex maxPathSize, int flags);
|
|
static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator)
|
|
{
|
|
kern_return_t kernResult = KERN_FAILURE;
|
|
mach_port_t masterPort;
|
|
CFMutableDictionaryRef classesToMatch;
|
|
const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass};
|
|
char *mediaType = NULL;
|
|
|
|
kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
|
|
if ( KERN_SUCCESS != kernResult ) {
|
|
printf( "IOMasterPort returned %d\n", kernResult );
|
|
}
|
|
|
|
int index;
|
|
for (index = 0; index < ARRAY_SIZE(matching_array); index++) {
|
|
classesToMatch = IOServiceMatching(matching_array[index]);
|
|
if (classesToMatch == NULL) {
|
|
error_report("IOServiceMatching returned NULL for %s",
|
|
matching_array[index]);
|
|
continue;
|
|
}
|
|
CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey),
|
|
kCFBooleanTrue);
|
|
kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch,
|
|
mediaIterator);
|
|
if (kernResult != KERN_SUCCESS) {
|
|
error_report("Note: IOServiceGetMatchingServices returned %d",
|
|
kernResult);
|
|
continue;
|
|
}
|
|
|
|
/* If a match was found, leave the loop */
|
|
if (*mediaIterator != 0) {
|
|
trace_file_FindEjectableOpticalMedia(matching_array[index]);
|
|
mediaType = g_strdup(matching_array[index]);
|
|
break;
|
|
}
|
|
}
|
|
return mediaType;
|
|
}
|
|
|
|
kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
|
|
CFIndex maxPathSize, int flags)
|
|
{
|
|
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 );
|
|
if (flags & BDRV_O_NOCACHE) {
|
|
strcat(bsdPath, "r");
|
|
}
|
|
devPathLength = strlen( bsdPath );
|
|
if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
|
|
kernResult = KERN_SUCCESS;
|
|
}
|
|
CFRelease( bsdPathAsCFString );
|
|
}
|
|
IOObjectRelease( nextMedia );
|
|
}
|
|
|
|
return kernResult;
|
|
}
|
|
|
|
/* Sets up a real cdrom for use in QEMU */
|
|
static bool setup_cdrom(char *bsd_path, Error **errp)
|
|
{
|
|
int index, num_of_test_partitions = 2, fd;
|
|
char test_partition[MAXPATHLEN];
|
|
bool partition_found = false;
|
|
|
|
/* look for a working partition */
|
|
for (index = 0; index < num_of_test_partitions; index++) {
|
|
snprintf(test_partition, sizeof(test_partition), "%ss%d", bsd_path,
|
|
index);
|
|
fd = qemu_open(test_partition, O_RDONLY | O_BINARY | O_LARGEFILE);
|
|
if (fd >= 0) {
|
|
partition_found = true;
|
|
qemu_close(fd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* if a working partition on the device was not found */
|
|
if (partition_found == false) {
|
|
error_setg(errp, "Failed to find a working partition on disc");
|
|
} else {
|
|
trace_file_setup_cdrom(test_partition);
|
|
pstrcpy(bsd_path, MAXPATHLEN, test_partition);
|
|
}
|
|
return partition_found;
|
|
}
|
|
|
|
/* Prints directions on mounting and unmounting a device */
|
|
static void print_unmounting_directions(const char *file_name)
|
|
{
|
|
error_report("If device %s is mounted on the desktop, unmount"
|
|
" it first before using it in QEMU", file_name);
|
|
error_report("Command to unmount device: diskutil unmountDisk %s",
|
|
file_name);
|
|
error_report("Command to mount device: diskutil mountDisk %s", file_name);
|
|
}
|
|
|
|
#endif /* defined(__APPLE__) && defined(__MACH__) */
|
|
|
|
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)
|
|
{
|
|
bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
|
|
}
|
|
|
|
static bool hdev_is_sg(BlockDriverState *bs)
|
|
{
|
|
|
|
#if defined(__linux__)
|
|
|
|
BDRVRawState *s = bs->opaque;
|
|
struct stat st;
|
|
struct sg_scsi_id scsiid;
|
|
int sg_version;
|
|
int ret;
|
|
|
|
if (stat(bs->filename, &st) < 0 || !S_ISCHR(st.st_mode)) {
|
|
return false;
|
|
}
|
|
|
|
ret = ioctl(s->fd, SG_GET_VERSION_NUM, &sg_version);
|
|
if (ret < 0) {
|
|
return false;
|
|
}
|
|
|
|
ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid);
|
|
if (ret >= 0) {
|
|
trace_file_hdev_is_sg(scsiid.scsi_type, sg_version);
|
|
return true;
|
|
}
|
|
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
Error *local_err = NULL;
|
|
int ret;
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
/*
|
|
* Caution: while qdict_get_str() is fine, getting non-string types
|
|
* would require more care. When @options come from -blockdev or
|
|
* blockdev_add, its members are typed according to the QAPI
|
|
* schema, but when they come from -drive, they're all QString.
|
|
*/
|
|
const char *filename = qdict_get_str(options, "filename");
|
|
char bsd_path[MAXPATHLEN] = "";
|
|
bool error_occurred = false;
|
|
|
|
/* If using a real cdrom */
|
|
if (strcmp(filename, "/dev/cdrom") == 0) {
|
|
char *mediaType = NULL;
|
|
kern_return_t ret_val;
|
|
io_iterator_t mediaIterator = 0;
|
|
|
|
mediaType = FindEjectableOpticalMedia(&mediaIterator);
|
|
if (mediaType == NULL) {
|
|
error_setg(errp, "Please make sure your CD/DVD is in the optical"
|
|
" drive");
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
ret_val = GetBSDPath(mediaIterator, bsd_path, sizeof(bsd_path), flags);
|
|
if (ret_val != KERN_SUCCESS) {
|
|
error_setg(errp, "Could not get BSD path for optical drive");
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
/* If a real optical drive was not found */
|
|
if (bsd_path[0] == '\0') {
|
|
error_setg(errp, "Failed to obtain bsd path for optical drive");
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
/* If using a cdrom disc and finding a partition on the disc failed */
|
|
if (strncmp(mediaType, kIOCDMediaClass, 9) == 0 &&
|
|
setup_cdrom(bsd_path, errp) == false) {
|
|
print_unmounting_directions(bsd_path);
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
qdict_put_str(options, "filename", bsd_path);
|
|
|
|
hdev_open_Mac_error:
|
|
g_free(mediaType);
|
|
if (mediaIterator) {
|
|
IOObjectRelease(mediaIterator);
|
|
}
|
|
if (error_occurred) {
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
#endif /* defined(__APPLE__) && defined(__MACH__) */
|
|
|
|
s->type = FTYPE_FILE;
|
|
|
|
ret = raw_open_common(bs, options, flags, 0, true, &local_err);
|
|
if (ret < 0) {
|
|
error_propagate(errp, local_err);
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
if (*bsd_path) {
|
|
filename = bsd_path;
|
|
}
|
|
/* if a physical device experienced an error while being opened */
|
|
if (strncmp(filename, "/dev/", 5) == 0) {
|
|
print_unmounting_directions(filename);
|
|
}
|
|
#endif /* defined(__APPLE__) && defined(__MACH__) */
|
|
return ret;
|
|
}
|
|
|
|
/* Since this does ioctl the device must be already opened */
|
|
bs->sg = hdev_is_sg(bs);
|
|
|
|
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__)
|
|
static int coroutine_fn
|
|
hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
RawPosixAIOData acb;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if (req == SG_IO && s->pr_mgr) {
|
|
struct sg_io_hdr *io_hdr = buf;
|
|
if (io_hdr->cmdp[0] == PERSISTENT_RESERVE_OUT ||
|
|
io_hdr->cmdp[0] == PERSISTENT_RESERVE_IN) {
|
|
return pr_manager_execute(s->pr_mgr, bdrv_get_aio_context(bs),
|
|
s->fd, io_hdr);
|
|
}
|
|
}
|
|
|
|
acb = (RawPosixAIOData) {
|
|
.bs = bs,
|
|
.aio_type = QEMU_AIO_IOCTL,
|
|
.aio_fildes = s->fd,
|
|
.aio_offset = 0,
|
|
.ioctl = {
|
|
.buf = buf,
|
|
.cmd = req,
|
|
},
|
|
};
|
|
|
|
return raw_thread_pool_submit(bs, handle_aiocb_ioctl, &acb);
|
|
}
|
|
#endif /* linux */
|
|
|
|
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;
|
|
}
|
|
|
|
static coroutine_fn int
|
|
hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
|
|
{
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
return raw_do_pdiscard(bs, offset, bytes, true);
|
|
}
|
|
|
|
static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs,
|
|
int64_t offset, int bytes, BdrvRequestFlags flags)
|
|
{
|
|
int rc;
|
|
|
|
rc = fd_open(bs);
|
|
if (rc < 0) {
|
|
return rc;
|
|
}
|
|
|
|
return raw_do_pwrite_zeroes(bs, offset, bytes, flags, true);
|
|
}
|
|
|
|
static int coroutine_fn hdev_co_create_opts(const char *filename, QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
int fd;
|
|
int ret = 0;
|
|
struct stat stat_buf;
|
|
int64_t total_size = 0;
|
|
bool has_prefix;
|
|
|
|
/* This function is used by both protocol block drivers and therefore either
|
|
* of these 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);
|
|
|
|
(void)has_prefix;
|
|
|
|
ret = raw_normalize_devicepath(&filename, errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
/* Read out options */
|
|
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
|
|
BDRV_SECTOR_SIZE);
|
|
|
|
fd = qemu_open(filename, O_WRONLY | O_BINARY);
|
|
if (fd < 0) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, -ret, "Could not open device");
|
|
return ret;
|
|
}
|
|
|
|
if (fstat(fd, &stat_buf) < 0) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, -ret, "Could not stat device");
|
|
} else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) {
|
|
error_setg(errp,
|
|
"The given file is neither a block nor a character device");
|
|
ret = -ENODEV;
|
|
} else if (lseek(fd, 0, SEEK_END) < total_size) {
|
|
error_setg(errp, "Device is too small");
|
|
ret = -ENOSPC;
|
|
}
|
|
|
|
if (!ret && total_size) {
|
|
uint8_t buf[BDRV_SECTOR_SIZE] = { 0 };
|
|
int64_t zero_size = MIN(BDRV_SECTOR_SIZE, total_size);
|
|
if (lseek(fd, 0, SEEK_SET) == -1) {
|
|
ret = -errno;
|
|
} else {
|
|
ret = qemu_write_full(fd, buf, zero_size);
|
|
ret = ret == zero_size ? 0 : -errno;
|
|
}
|
|
}
|
|
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_co_create_opts = hdev_co_create_opts,
|
|
.create_opts = &raw_create_opts,
|
|
.mutable_opts = mutable_opts,
|
|
.bdrv_co_invalidate_cache = raw_co_invalidate_cache,
|
|
.bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes,
|
|
|
|
.bdrv_co_preadv = raw_co_preadv,
|
|
.bdrv_co_pwritev = raw_co_pwritev,
|
|
.bdrv_co_flush_to_disk = raw_co_flush_to_disk,
|
|
.bdrv_co_pdiscard = hdev_co_pdiscard,
|
|
.bdrv_co_copy_range_from = raw_co_copy_range_from,
|
|
.bdrv_co_copy_range_to = raw_co_copy_range_to,
|
|
.bdrv_refresh_limits = raw_refresh_limits,
|
|
.bdrv_io_plug = raw_aio_plug,
|
|
.bdrv_io_unplug = raw_aio_unplug,
|
|
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
|
|
|
|
.bdrv_co_truncate = raw_co_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_info = raw_get_info,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
.bdrv_check_perm = raw_check_perm,
|
|
.bdrv_set_perm = raw_set_perm,
|
|
.bdrv_abort_perm_update = raw_abort_perm_update,
|
|
.bdrv_probe_blocksizes = hdev_probe_blocksizes,
|
|
.bdrv_probe_geometry = hdev_probe_geometry,
|
|
|
|
/* generic scsi device */
|
|
#ifdef __linux__
|
|
.bdrv_co_ioctl = hdev_co_ioctl,
|
|
#endif
|
|
};
|
|
|
|
#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
static void cdrom_parse_filename(const char *filename, QDict *options,
|
|
Error **errp)
|
|
{
|
|
bdrv_parse_filename_strip_prefix(filename, "host_cdrom:", options);
|
|
}
|
|
#endif
|
|
|
|
#ifdef __linux__
|
|
static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
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, options, flags, O_NONBLOCK, true, errp);
|
|
}
|
|
|
|
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 bool cdrom_is_inserted(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
|
|
return ret == CDS_DISC_OK;
|
|
}
|
|
|
|
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_co_create_opts = hdev_co_create_opts,
|
|
.create_opts = &raw_create_opts,
|
|
.mutable_opts = mutable_opts,
|
|
.bdrv_co_invalidate_cache = raw_co_invalidate_cache,
|
|
|
|
|
|
.bdrv_co_preadv = raw_co_preadv,
|
|
.bdrv_co_pwritev = raw_co_pwritev,
|
|
.bdrv_co_flush_to_disk = raw_co_flush_to_disk,
|
|
.bdrv_refresh_limits = raw_refresh_limits,
|
|
.bdrv_io_plug = raw_aio_plug,
|
|
.bdrv_io_unplug = raw_aio_unplug,
|
|
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
|
|
|
|
.bdrv_co_truncate = raw_co_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.has_variable_length = true,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
/* removable device support */
|
|
.bdrv_is_inserted = cdrom_is_inserted,
|
|
.bdrv_eject = cdrom_eject,
|
|
.bdrv_lock_medium = cdrom_lock_medium,
|
|
|
|
/* generic scsi device */
|
|
.bdrv_co_ioctl = hdev_co_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, true, &local_err);
|
|
if (ret) {
|
|
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 bool 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_co_create_opts = hdev_co_create_opts,
|
|
.create_opts = &raw_create_opts,
|
|
.mutable_opts = mutable_opts,
|
|
|
|
.bdrv_co_preadv = raw_co_preadv,
|
|
.bdrv_co_pwritev = raw_co_pwritev,
|
|
.bdrv_co_flush_to_disk = raw_co_flush_to_disk,
|
|
.bdrv_refresh_limits = raw_refresh_limits,
|
|
.bdrv_io_plug = raw_aio_plug,
|
|
.bdrv_io_unplug = raw_aio_unplug,
|
|
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
|
|
|
|
.bdrv_co_truncate = raw_co_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.has_variable_length = true,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
/* removable device support */
|
|
.bdrv_is_inserted = cdrom_is_inserted,
|
|
.bdrv_eject = cdrom_eject,
|
|
.bdrv_lock_medium = cdrom_lock_medium,
|
|
};
|
|
#endif /* __FreeBSD__ */
|
|
|
|
static void bdrv_file_init(void)
|
|
{
|
|
/*
|
|
* Register all the drivers. Note that order is important, the driver
|
|
* registered last will get probed first.
|
|
*/
|
|
bdrv_register(&bdrv_file);
|
|
bdrv_register(&bdrv_host_device);
|
|
#ifdef __linux__
|
|
bdrv_register(&bdrv_host_cdrom);
|
|
#endif
|
|
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
bdrv_register(&bdrv_host_cdrom);
|
|
#endif
|
|
}
|
|
|
|
block_init(bdrv_file_init);
|