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Diffstat (limited to 'qemu/block/raw-posix.c')
-rw-r--r--qemu/block/raw-posix.c2701
1 files changed, 0 insertions, 2701 deletions
diff --git a/qemu/block/raw-posix.c b/qemu/block/raw-posix.c
deleted file mode 100644
index 906d5c941..000000000
--- a/qemu/block/raw-posix.c
+++ /dev/null
@@ -1,2701 +0,0 @@
-/*
- * 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 "qemu/timer.h"
-#include "qemu/log.h"
-#include "block/block_int.h"
-#include "qemu/module.h"
-#include "trace.h"
-#include "block/thread-pool.h"
-#include "qemu/iov.h"
-#include "raw-aio.h"
-#include "qapi/util.h"
-#include "qapi/qmp/qstring.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 <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
-
-//#define DEBUG_BLOCK
-
-#ifdef DEBUG_BLOCK
-# define DEBUG_BLOCK_PRINT 1
-#else
-# define DEBUG_BLOCK_PRINT 0
-#endif
-#define DPRINTF(fmt, ...) \
-do { \
- if (DEBUG_BLOCK_PRINT) { \
- printf(fmt, ## __VA_ARGS__); \
- } \
-} while (0)
-
-/* 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
-
-typedef struct BDRVRawState {
- int fd;
- int type;
- int open_flags;
- size_t buf_align;
-
-#ifdef CONFIG_LINUX_AIO
- int use_aio;
- void *aio_ctx;
-#endif
-#ifdef CONFIG_XFS
- bool is_xfs:1;
-#endif
- bool has_discard:1;
- bool has_write_zeroes:1;
- bool discard_zeroes:1;
- bool has_fallocate;
- bool needs_alignment;
-} BDRVRawState;
-
-typedef struct BDRVRawReopenState {
- int fd;
- int open_flags;
-#ifdef CONFIG_LINUX_AIO
- int use_aio;
-#endif
-} BDRVRawReopenState;
-
-static int fd_open(BlockDriverState *bs);
-static int64_t raw_getlength(BlockDriverState *bs);
-
-typedef struct RawPosixAIOData {
- BlockDriverState *bs;
- int aio_fildes;
- union {
- struct iovec *aio_iov;
- void *aio_ioctl_buf;
- };
- int aio_niov;
- uint64_t aio_nbytes;
-#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
- off_t aio_offset;
- int aio_type;
-} RawPosixAIOData;
-
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-static int cdrom_reopen(BlockDriverState *bs);
-#endif
-
-#if defined(__NetBSD__)
-static int raw_normalize_devicepath(const char **filename)
-{
- static char namebuf[PATH_MAX];
- const char *dp, *fname;
- struct stat sb;
-
- fname = *filename;
- dp = strrchr(fname, '/');
- if (lstat(fname, &sb) < 0) {
- fprintf(stderr, "%s: stat failed: %s\n",
- fname, strerror(errno));
- return -errno;
- }
-
- if (!S_ISBLK(sb.st_mode)) {
- return 0;
- }
-
- if (dp == NULL) {
- snprintf(namebuf, PATH_MAX, "r%s", fname);
- } else {
- snprintf(namebuf, PATH_MAX, "%.*s/r%s",
- (int)(dp - fname), fname, dp + 1);
- }
- fprintf(stderr, "%s is a block device", fname);
- *filename = namebuf;
- fprintf(stderr, ", using %s\n", *filename);
-
- return 0;
-}
-#else
-static int raw_normalize_devicepath(const char **filename)
-{
- return 0;
-}
-#endif
-
-/*
- * 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;
-
- errno = ENOTSUP;
-
- /* Try a few ioctls to get the right size */
-#ifdef BLKSSZGET
- if (ioctl(fd, BLKSSZGET, &sector_size) >= 0) {
- *sector_size_p = sector_size;
- success = true;
- }
-#endif
-#ifdef DKIOCGETBLOCKSIZE
- if (ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) >= 0) {
- *sector_size_p = sector_size;
- success = true;
- }
-#endif
-#ifdef DIOCGSECTORSIZE
- if (ioctl(fd, DIOCGSECTORSIZE, &sector_size) >= 0) {
- *sector_size_p = sector_size;
- success = true;
- }
-#endif
-
- 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->request_alignment = 1;
- s->buf_align = 1;
- return;
- }
-
- bs->request_alignment = 0;
- s->buf_align = 0;
- /* Let's try to use the logical blocksize for the alignment. */
- if (probe_logical_blocksize(fd, &bs->request_alignment) < 0) {
- bs->request_alignment = 0;
- }
-#ifdef CONFIG_XFS
- if (s->is_xfs) {
- struct dioattr da;
- if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
- bs->request_alignment = da.d_miniosz;
- /* The kernel returns wrong information for d_mem */
- /* s->buf_align = da.d_mem; */
- }
- }
-#endif
-
- /* If we could not get the sizes so far, we can only guess them */
- if (!s->buf_align) {
- size_t align;
- buf = qemu_memalign(max_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->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->request_alignment = align;
- break;
- }
- }
- qemu_vfree(buf);
- }
-
- if (!s->buf_align || !bs->request_alignment) {
- error_setg(errp, "Could not find working O_DIRECT alignment. "
- "Try cache.direct=off.");
- }
-}
-
-static void raw_parse_flags(int bdrv_flags, int *open_flags)
-{
- assert(open_flags != NULL);
-
- *open_flags |= O_BINARY;
- *open_flags &= ~O_ACCMODE;
- if (bdrv_flags & BDRV_O_RDWR) {
- *open_flags |= O_RDWR;
- } else {
- *open_flags |= O_RDONLY;
- }
-
- /* Use O_DSYNC for write-through caching, no flags for write-back caching,
- * and O_DIRECT for no caching. */
- if ((bdrv_flags & BDRV_O_NOCACHE)) {
- *open_flags |= O_DIRECT;
- }
-}
-
-static void raw_detach_aio_context(BlockDriverState *bs)
-{
-#ifdef CONFIG_LINUX_AIO
- BDRVRawState *s = bs->opaque;
-
- if (s->use_aio) {
- laio_detach_aio_context(s->aio_ctx, bdrv_get_aio_context(bs));
- }
-#endif
-}
-
-static void raw_attach_aio_context(BlockDriverState *bs,
- AioContext *new_context)
-{
-#ifdef CONFIG_LINUX_AIO
- BDRVRawState *s = bs->opaque;
-
- if (s->use_aio) {
- laio_attach_aio_context(s->aio_ctx, new_context);
- }
-#endif
-}
-
-#ifdef CONFIG_LINUX_AIO
-static int raw_set_aio(void **aio_ctx, int *use_aio, int bdrv_flags)
-{
- int ret = -1;
- assert(aio_ctx != NULL);
- assert(use_aio != NULL);
- /*
- * Currently Linux do AIO only for files opened with O_DIRECT
- * specified so check NOCACHE flag too
- */
- if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
- (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
-
- /* if non-NULL, laio_init() has already been run */
- if (*aio_ctx == NULL) {
- *aio_ctx = laio_init();
- if (!*aio_ctx) {
- goto error;
- }
- }
- *use_aio = 1;
- } else {
- *use_aio = 0;
- }
-
- ret = 0;
-
-error:
- return ret;
-}
-#endif
-
-static void raw_parse_filename(const char *filename, QDict *options,
- Error **errp)
-{
- /* The filename does not have to be prefixed by the protocol name, since
- * "file" is the default protocol; therefore, the return value of this
- * function call can be ignored. */
- strstart(filename, "file:", &filename);
-
- qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
-}
-
-static QemuOptsList raw_runtime_opts = {
- .name = "raw",
- .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
- .desc = {
- {
- .name = "filename",
- .type = QEMU_OPT_STRING,
- .help = "File name of the image",
- },
- { /* end of list */ }
- },
-};
-
-static int raw_open_common(BlockDriverState *bs, QDict *options,
- int bdrv_flags, int open_flags, Error **errp)
-{
- BDRVRawState *s = bs->opaque;
- QemuOpts *opts;
- Error *local_err = NULL;
- const char *filename = NULL;
- int fd, ret;
- struct stat st;
-
- opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
- qemu_opts_absorb_qdict(opts, options, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- ret = -EINVAL;
- goto fail;
- }
-
- filename = qemu_opt_get(opts, "filename");
-
- ret = raw_normalize_devicepath(&filename);
- if (ret != 0) {
- error_setg_errno(errp, -ret, "Could not normalize device path");
- goto fail;
- }
-
- s->open_flags = open_flags;
- raw_parse_flags(bdrv_flags, &s->open_flags);
-
- s->fd = -1;
- fd = qemu_open(filename, s->open_flags, 0644);
- if (fd < 0) {
- ret = -errno;
- if (ret == -EROFS) {
- ret = -EACCES;
- }
- goto fail;
- }
- s->fd = fd;
-
-#ifdef CONFIG_LINUX_AIO
- if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
- qemu_close(fd);
- ret = -errno;
- error_setg_errno(errp, -ret, "Could not set AIO state");
- goto fail;
- }
- if (!s->use_aio && (bdrv_flags & BDRV_O_NATIVE_AIO)) {
- error_setg(errp, "aio=native was specified, but it requires "
- "cache.direct=on, which was not specified.");
- ret = -EINVAL;
- goto fail;
- }
-#else
- if (bdrv_flags & BDRV_O_NATIVE_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 (S_ISREG(st.st_mode)) {
- s->discard_zeroes = true;
- s->has_fallocate = true;
- }
- if (S_ISBLK(st.st_mode)) {
-#ifdef BLKDISCARDZEROES
- unsigned int arg;
- if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) {
- s->discard_zeroes = true;
- }
-#endif
-#ifdef __linux__
- /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
- * not rely on the contents of discarded blocks unless using O_DIRECT.
- * Same for BLKZEROOUT.
- */
- if (!(bs->open_flags & BDRV_O_NOCACHE)) {
- s->discard_zeroes = false;
- s->has_write_zeroes = false;
- }
-#endif
- }
-#ifdef __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
-
- raw_attach_aio_context(bs, bdrv_get_aio_context(bs));
-
- ret = 0;
-fail:
- if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
- unlink(filename);
- }
- qemu_opts_del(opts);
- return ret;
-}
-
-static int raw_open(BlockDriverState *bs, QDict *options, int flags,
- Error **errp)
-{
- BDRVRawState *s = bs->opaque;
- Error *local_err = NULL;
- int ret;
-
- s->type = FTYPE_FILE;
- ret = raw_open_common(bs, options, flags, 0, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- }
- return ret;
-}
-
-static int raw_reopen_prepare(BDRVReopenState *state,
- BlockReopenQueue *queue, Error **errp)
-{
- BDRVRawState *s;
- BDRVRawReopenState *raw_s;
- int ret = 0;
- Error *local_err = NULL;
-
- assert(state != NULL);
- assert(state->bs != NULL);
-
- s = state->bs->opaque;
-
- state->opaque = g_new0(BDRVRawReopenState, 1);
- raw_s = state->opaque;
-
-#ifdef CONFIG_LINUX_AIO
- raw_s->use_aio = s->use_aio;
-
- /* we can use s->aio_ctx instead of a copy, because the use_aio flag is
- * valid in the 'false' condition even if aio_ctx is set, and raw_set_aio()
- * won't override aio_ctx if aio_ctx is non-NULL */
- if (raw_set_aio(&s->aio_ctx, &raw_s->use_aio, state->flags)) {
- error_setg(errp, "Could not set AIO state");
- return -1;
- }
-#endif
-
- if (s->type == FTYPE_CD) {
- raw_s->open_flags |= O_NONBLOCK;
- }
-
- raw_parse_flags(state->flags, &raw_s->open_flags);
-
- raw_s->fd = -1;
-
- int fcntl_flags = O_APPEND | O_NONBLOCK;
-#ifdef O_NOATIME
- fcntl_flags |= O_NOATIME;
-#endif
-
-#ifdef O_ASYNC
- /* Not all operating systems have O_ASYNC, and those that don't
- * will not let us track the state into raw_s->open_flags (typically
- * you achieve the same effect with an ioctl, for example I_SETSIG
- * on Solaris). But we do not use O_ASYNC, so that's fine.
- */
- assert((s->open_flags & O_ASYNC) == 0);
-#endif
-
- if ((raw_s->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
- /* dup the original fd */
- /* TODO: use qemu fcntl wrapper */
-#ifdef F_DUPFD_CLOEXEC
- raw_s->fd = fcntl(s->fd, F_DUPFD_CLOEXEC, 0);
-#else
- raw_s->fd = dup(s->fd);
- if (raw_s->fd != -1) {
- qemu_set_cloexec(raw_s->fd);
- }
-#endif
- if (raw_s->fd >= 0) {
- ret = fcntl_setfl(raw_s->fd, raw_s->open_flags);
- if (ret) {
- qemu_close(raw_s->fd);
- raw_s->fd = -1;
- }
- }
- }
-
- /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
- if (raw_s->fd == -1) {
- const char *normalized_filename = state->bs->filename;
- ret = raw_normalize_devicepath(&normalized_filename);
- if (ret < 0) {
- error_setg_errno(errp, -ret, "Could not normalize device path");
- } else {
- assert(!(raw_s->open_flags & O_CREAT));
- raw_s->fd = qemu_open(normalized_filename, raw_s->open_flags);
- if (raw_s->fd == -1) {
- error_setg_errno(errp, errno, "Could not reopen file");
- ret = -1;
- }
- }
- }
-
- /* Fail already reopen_prepare() if we can't get a working O_DIRECT
- * alignment with the new fd. */
- if (raw_s->fd != -1) {
- raw_probe_alignment(state->bs, raw_s->fd, &local_err);
- if (local_err) {
- qemu_close(raw_s->fd);
- raw_s->fd = -1;
- error_propagate(errp, local_err);
- ret = -EINVAL;
- }
- }
-
- return ret;
-}
-
-static void raw_reopen_commit(BDRVReopenState *state)
-{
- BDRVRawReopenState *raw_s = state->opaque;
- BDRVRawState *s = state->bs->opaque;
-
- s->open_flags = raw_s->open_flags;
-
- qemu_close(s->fd);
- s->fd = raw_s->fd;
-#ifdef CONFIG_LINUX_AIO
- s->use_aio = raw_s->use_aio;
-#endif
-
- g_free(state->opaque);
- state->opaque = NULL;
-}
-
-
-static void raw_reopen_abort(BDRVReopenState *state)
-{
- BDRVRawReopenState *raw_s = state->opaque;
-
- /* nothing to do if NULL, we didn't get far enough */
- if (raw_s == NULL) {
- return;
- }
-
- if (raw_s->fd >= 0) {
- qemu_close(raw_s->fd);
- raw_s->fd = -1;
- }
- g_free(state->opaque);
- state->opaque = NULL;
-}
-
-static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
-{
- BDRVRawState *s = bs->opaque;
-
- raw_probe_alignment(bs, s->fd, errp);
- bs->bl.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
-
-static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
-{
- int ret;
-
- ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
- if (ret == -1) {
- return -errno;
- }
-
- return 0;
-}
-
-static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
-{
- int ret;
-
- ret = qemu_fdatasync(aiocb->aio_fildes);
- if (ret == -1) {
- return -errno;
- }
- return 0;
-}
-
-#ifdef CONFIG_PREADV
-
-static bool preadv_present = true;
-
-static ssize_t
-qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
-{
- return preadv(fd, iov, nr_iov, offset);
-}
-
-static ssize_t
-qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
-{
- return pwritev(fd, iov, nr_iov, offset);
-}
-
-#else
-
-static bool preadv_present = false;
-
-static ssize_t
-qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
-{
- return -ENOSYS;
-}
-
-static ssize_t
-qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
-{
- return -ENOSYS;
-}
-
-#endif
-
-static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
-{
- ssize_t len;
-
- do {
- if (aiocb->aio_type & QEMU_AIO_WRITE)
- len = qemu_pwritev(aiocb->aio_fildes,
- aiocb->aio_iov,
- aiocb->aio_niov,
- aiocb->aio_offset);
- else
- len = qemu_preadv(aiocb->aio_fildes,
- aiocb->aio_iov,
- aiocb->aio_niov,
- aiocb->aio_offset);
- } while (len == -1 && errno == EINTR);
-
- if (len == -1) {
- return -errno;
- }
- return len;
-}
-
-/*
- * Read/writes the data to/from a given linear buffer.
- *
- * Returns the number of bytes handles or -errno in case of an error. Short
- * reads are only returned if the end of the file is reached.
- */
-static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
-{
- ssize_t offset = 0;
- ssize_t len;
-
- while (offset < aiocb->aio_nbytes) {
- if (aiocb->aio_type & QEMU_AIO_WRITE) {
- len = pwrite(aiocb->aio_fildes,
- (const char *)buf + offset,
- aiocb->aio_nbytes - offset,
- aiocb->aio_offset + offset);
- } else {
- len = pread(aiocb->aio_fildes,
- buf + offset,
- aiocb->aio_nbytes - offset,
- aiocb->aio_offset + offset);
- }
- if (len == -1 && errno == EINTR) {
- continue;
- } else if (len == -1 && errno == EINVAL &&
- (aiocb->bs->open_flags & BDRV_O_NOCACHE) &&
- !(aiocb->aio_type & QEMU_AIO_WRITE) &&
- offset > 0) {
- /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
- * after a short read. Assume that O_DIRECT short reads only occur
- * at EOF. Therefore this is a short read, not an I/O error.
- */
- break;
- } else if (len == -1) {
- offset = -errno;
- break;
- } else if (len == 0) {
- break;
- }
- offset += len;
- }
-
- return offset;
-}
-
-static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
-{
- ssize_t nbytes;
- char *buf;
-
- if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
- /*
- * If there is just a single buffer, and it is properly aligned
- * we can just use plain pread/pwrite without any problems.
- */
- if (aiocb->aio_niov == 1) {
- return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
- }
- /*
- * We have more than one iovec, and all are properly aligned.
- *
- * Try preadv/pwritev first and fall back to linearizing the
- * buffer if it's not supported.
- */
- if (preadv_present) {
- nbytes = handle_aiocb_rw_vector(aiocb);
- if (nbytes == aiocb->aio_nbytes ||
- (nbytes < 0 && nbytes != -ENOSYS)) {
- return nbytes;
- }
- preadv_present = false;
- }
-
- /*
- * XXX(hch): short read/write. no easy way to handle the reminder
- * using these interfaces. For now retry using plain
- * pread/pwrite?
- */
- }
-
- /*
- * Ok, we have to do it the hard way, copy all segments into
- * a single aligned buffer.
- */
- buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes);
- if (buf == NULL) {
- return -ENOMEM;
- }
-
- if (aiocb->aio_type & QEMU_AIO_WRITE) {
- char *p = buf;
- int i;
-
- for (i = 0; i < aiocb->aio_niov; ++i) {
- memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
- p += aiocb->aio_iov[i].iov_len;
- }
- assert(p - buf == aiocb->aio_nbytes);
- }
-
- nbytes = handle_aiocb_rw_linear(aiocb, buf);
- if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
- char *p = buf;
- size_t count = aiocb->aio_nbytes, copy;
- int i;
-
- for (i = 0; i < aiocb->aio_niov && count; ++i) {
- copy = count;
- if (copy > aiocb->aio_iov[i].iov_len) {
- copy = aiocb->aio_iov[i].iov_len;
- }
- memcpy(aiocb->aio_iov[i].iov_base, p, copy);
- assert(count >= copy);
- p += copy;
- count -= copy;
- }
- assert(count == 0);
- }
- qemu_vfree(buf);
-
- return nbytes;
-}
-
-#ifdef CONFIG_XFS
-static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
-{
- struct xfs_flock64 fl;
- 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_ZERO_RANGE, &fl) < 0) {
- err = errno;
- DPRINTF("cannot write zero range (%s)\n", 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;
- DPRINTF("cannot punch hole (%s)\n", 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
- 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 ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
-{
-#if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
- BDRVRawState *s = aiocb->bs->opaque;
-#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
- if (s->has_fallocate && aiocb->aio_offset >= bdrv_getlength(aiocb->bs)) {
- 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 ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
-{
- int ret = -EOPNOTSUPP;
- BDRVRawState *s = aiocb->bs->opaque;
-
- if (!s->has_discard) {
- return -ENOTSUP;
- }
-
- if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
-#ifdef BLKDISCARD
- do {
- uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
- if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) {
- return 0;
- }
- } while (errno == EINTR);
-
- ret = -errno;
-#endif
- } else {
-#ifdef CONFIG_XFS
- if (s->is_xfs) {
- return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes);
- }
-#endif
-
-#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
- 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 aio_worker(void *arg)
-{
- RawPosixAIOData *aiocb = arg;
- ssize_t ret = 0;
-
- switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
- case QEMU_AIO_READ:
- ret = handle_aiocb_rw(aiocb);
- if (ret >= 0 && ret < aiocb->aio_nbytes) {
- iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
- 0, aiocb->aio_nbytes - ret);
-
- ret = aiocb->aio_nbytes;
- }
- if (ret == aiocb->aio_nbytes) {
- ret = 0;
- } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
- ret = -EINVAL;
- }
- break;
- case QEMU_AIO_WRITE:
- ret = handle_aiocb_rw(aiocb);
- if (ret == aiocb->aio_nbytes) {
- ret = 0;
- } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
- ret = -EINVAL;
- }
- break;
- case QEMU_AIO_FLUSH:
- ret = handle_aiocb_flush(aiocb);
- break;
- case QEMU_AIO_IOCTL:
- ret = handle_aiocb_ioctl(aiocb);
- break;
- case QEMU_AIO_DISCARD:
- ret = handle_aiocb_discard(aiocb);
- break;
- case QEMU_AIO_WRITE_ZEROES:
- ret = handle_aiocb_write_zeroes(aiocb);
- break;
- default:
- fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
- ret = -EINVAL;
- break;
- }
-
- g_free(aiocb);
- return ret;
-}
-
-static int paio_submit_co(BlockDriverState *bs, int fd,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- int type)
-{
- RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
- ThreadPool *pool;
-
- acb->bs = bs;
- acb->aio_type = type;
- acb->aio_fildes = fd;
-
- acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
- acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
-
- if (qiov) {
- acb->aio_iov = qiov->iov;
- acb->aio_niov = qiov->niov;
- assert(qiov->size == acb->aio_nbytes);
- }
-
- trace_paio_submit_co(sector_num, nb_sectors, type);
- pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
- return thread_pool_submit_co(pool, aio_worker, acb);
-}
-
-static BlockAIOCB *paio_submit(BlockDriverState *bs, int fd,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockCompletionFunc *cb, void *opaque, int type)
-{
- RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
- ThreadPool *pool;
-
- acb->bs = bs;
- acb->aio_type = type;
- acb->aio_fildes = fd;
-
- acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
- acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
-
- if (qiov) {
- acb->aio_iov = qiov->iov;
- acb->aio_niov = qiov->niov;
- assert(qiov->size == acb->aio_nbytes);
- }
-
- trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
- pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
- return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
-}
-
-static BlockAIOCB *raw_aio_submit(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockCompletionFunc *cb, void *opaque, int type)
-{
- BDRVRawState *s = bs->opaque;
-
- if (fd_open(bs) < 0)
- return NULL;
-
- /*
- * 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_aio) {
- return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
- nb_sectors, cb, opaque, type);
-#endif
- }
- }
-
- return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
- cb, opaque, type);
-}
-
-static void raw_aio_plug(BlockDriverState *bs)
-{
-#ifdef CONFIG_LINUX_AIO
- BDRVRawState *s = bs->opaque;
- if (s->use_aio) {
- laio_io_plug(bs, s->aio_ctx);
- }
-#endif
-}
-
-static void raw_aio_unplug(BlockDriverState *bs)
-{
-#ifdef CONFIG_LINUX_AIO
- BDRVRawState *s = bs->opaque;
- if (s->use_aio) {
- laio_io_unplug(bs, s->aio_ctx, true);
- }
-#endif
-}
-
-static void raw_aio_flush_io_queue(BlockDriverState *bs)
-{
-#ifdef CONFIG_LINUX_AIO
- BDRVRawState *s = bs->opaque;
- if (s->use_aio) {
- laio_io_unplug(bs, s->aio_ctx, false);
- }
-#endif
-}
-
-static BlockAIOCB *raw_aio_readv(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockCompletionFunc *cb, void *opaque)
-{
- return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
- cb, opaque, QEMU_AIO_READ);
-}
-
-static BlockAIOCB *raw_aio_writev(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockCompletionFunc *cb, void *opaque)
-{
- return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
- cb, opaque, QEMU_AIO_WRITE);
-}
-
-static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
- BlockCompletionFunc *cb, void *opaque)
-{
- BDRVRawState *s = bs->opaque;
-
- if (fd_open(bs) < 0)
- return NULL;
-
- return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
-}
-
-static void raw_close(BlockDriverState *bs)
-{
- BDRVRawState *s = bs->opaque;
-
- raw_detach_aio_context(bs);
-
-#ifdef CONFIG_LINUX_AIO
- if (s->use_aio) {
- laio_cleanup(s->aio_ctx);
- }
-#endif
- if (s->fd >= 0) {
- qemu_close(s->fd);
- s->fd = -1;
- }
-}
-
-static int raw_truncate(BlockDriverState *bs, int64_t offset)
-{
- BDRVRawState *s = bs->opaque;
- struct stat st;
-
- if (fstat(s->fd, &st)) {
- return -errno;
- }
-
- if (S_ISREG(st.st_mode)) {
- if (ftruncate(s->fd, offset) < 0) {
- return -errno;
- }
- } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
- if (offset > raw_getlength(bs)) {
- return -EINVAL;
- }
- } else {
- return -ENOTSUP;
- }
-
- return 0;
-}
-
-#ifdef __OpenBSD__
-static int64_t raw_getlength(BlockDriverState *bs)
-{
- BDRVRawState *s = bs->opaque;
- int fd = s->fd;
- struct stat st;
-
- if (fstat(fd, &st))
- return -errno;
- if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
- struct disklabel dl;
-
- if (ioctl(fd, DIOCGDINFO, &dl))
- return -errno;
- return (uint64_t)dl.d_secsize *
- dl.d_partitions[DISKPART(st.st_rdev)].p_size;
- } else
- return st.st_size;
-}
-#elif defined(__NetBSD__)
-static int64_t raw_getlength(BlockDriverState *bs)
-{
- BDRVRawState *s = bs->opaque;
- int fd = s->fd;
- struct stat st;
-
- if (fstat(fd, &st))
- return -errno;
- if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
- struct dkwedge_info dkw;
-
- if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
- return dkw.dkw_size * 512;
- } else {
- struct disklabel dl;
-
- if (ioctl(fd, DIOCGDINFO, &dl))
- return -errno;
- return (uint64_t)dl.d_secsize *
- dl.d_partitions[DISKPART(st.st_rdev)].p_size;
- }
- } else
- return st.st_size;
-}
-#elif defined(__sun__)
-static int64_t raw_getlength(BlockDriverState *bs)
-{
- BDRVRawState *s = bs->opaque;
- struct dk_minfo minfo;
- int ret;
- int64_t size;
-
- ret = fd_open(bs);
- if (ret < 0) {
- return ret;
- }
-
- /*
- * Use the DKIOCGMEDIAINFO ioctl to read the size.
- */
- ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
- if (ret != -1) {
- return minfo.dki_lbsize * minfo.dki_capacity;
- }
-
- /*
- * There are reports that lseek on some devices fails, but
- * irc discussion said that contingency on contingency was overkill.
- */
- size = lseek(s->fd, 0, SEEK_END);
- if (size < 0) {
- return -errno;
- }
- return size;
-}
-#elif defined(CONFIG_BSD)
-static int64_t raw_getlength(BlockDriverState *bs)
-{
- BDRVRawState *s = bs->opaque;
- int fd = s->fd;
- int64_t size;
- struct stat sb;
-#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
- int reopened = 0;
-#endif
- int ret;
-
- ret = fd_open(bs);
- if (ret < 0)
- return ret;
-
-#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
-again:
-#endif
- if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
-#ifdef DIOCGMEDIASIZE
- if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
-#elif defined(DIOCGPART)
- {
- struct partinfo pi;
- if (ioctl(fd, DIOCGPART, &pi) == 0)
- size = pi.media_size;
- else
- size = 0;
- }
- if (size == 0)
-#endif
-#if defined(__APPLE__) && defined(__MACH__)
- {
- uint64_t sectors = 0;
- uint32_t sector_size = 0;
-
- if (ioctl(fd, DKIOCGETBLOCKCOUNT, &sectors) == 0
- && ioctl(fd, DKIOCGETBLOCKSIZE, &sector_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 raw_create(const char *filename, QemuOpts *opts, Error **errp)
-{
- int fd;
- int result = 0;
- int64_t total_size = 0;
- bool nocow = false;
- PreallocMode prealloc;
- char *buf = NULL;
- Error *local_err = NULL;
-
- strstart(filename, "file:", &filename);
-
- /* Read out options */
- total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
- BDRV_SECTOR_SIZE);
- nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false);
- buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
- prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
- PREALLOC_MODE__MAX, PREALLOC_MODE_OFF,
- &local_err);
- g_free(buf);
- if (local_err) {
- error_propagate(errp, local_err);
- result = -EINVAL;
- goto out;
- }
-
- fd = qemu_open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
- 0644);
- if (fd < 0) {
- result = -errno;
- error_setg_errno(errp, -result, "Could not create file");
- goto out;
- }
-
- if (nocow) {
-#ifdef __linux__
- /* Set NOCOW flag to solve performance issue on fs like btrfs.
- * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
- * will be ignored since any failure of this operation should not
- * block the left work.
- */
- int attr;
- if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) {
- attr |= FS_NOCOW_FL;
- ioctl(fd, FS_IOC_SETFLAGS, &attr);
- }
-#endif
- }
-
- if (ftruncate(fd, total_size) != 0) {
- result = -errno;
- error_setg_errno(errp, -result, "Could not resize file");
- goto out_close;
- }
-
- switch (prealloc) {
-#ifdef CONFIG_POSIX_FALLOCATE
- case PREALLOC_MODE_FALLOC:
- /* posix_fallocate() doesn't set errno. */
- result = -posix_fallocate(fd, 0, total_size);
- if (result != 0) {
- error_setg_errno(errp, -result,
- "Could not preallocate data for the new file");
- }
- break;
-#endif
- case PREALLOC_MODE_FULL:
- {
- int64_t num = 0, left = total_size;
- buf = g_malloc0(65536);
-
- while (left > 0) {
- num = MIN(left, 65536);
- result = write(fd, buf, num);
- if (result < 0) {
- result = -errno;
- error_setg_errno(errp, -result,
- "Could not write to the new file");
- break;
- }
- left -= result;
- }
- if (result >= 0) {
- result = fsync(fd);
- if (result < 0) {
- result = -errno;
- error_setg_errno(errp, -result,
- "Could not flush new file to disk");
- }
- }
- g_free(buf);
- break;
- }
- case PREALLOC_MODE_OFF:
- break;
- default:
- result = -EINVAL;
- error_setg(errp, "Unsupported preallocation mode: %s",
- PreallocMode_lookup[prealloc]);
- break;
- }
-
-out_close:
- if (qemu_close(fd) != 0 && result == 0) {
- result = -errno;
- error_setg_errno(errp, -result, "Could not close the new file");
- }
-out:
- return result;
-}
-
-/*
- * 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 */
- }
- assert(offs >= start);
-
- 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) */
- }
- assert(offs >= start);
-
- 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 sectors.
- *
- * If 'sector_num' is beyond the end of the disk image the return value is 0
- * and 'pnum' is set to 0.
- *
- * 'pnum' is set to the number of sectors (including and immediately following
- * the specified sector) that are known to be in the same
- * allocated/unallocated state.
- *
- * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
- * beyond the end of the disk image it will be clamped.
- */
-static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
- int64_t sector_num,
- int nb_sectors, int *pnum,
- BlockDriverState **file)
-{
- off_t start, data = 0, hole = 0;
- int64_t total_size;
- int ret;
-
- ret = fd_open(bs);
- if (ret < 0) {
- return ret;
- }
-
- start = sector_num * BDRV_SECTOR_SIZE;
- total_size = bdrv_getlength(bs);
- if (total_size < 0) {
- return total_size;
- } else if (start >= total_size) {
- *pnum = 0;
- return 0;
- } else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) {
- nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
- }
-
- ret = find_allocation(bs, start, &data, &hole);
- if (ret == -ENXIO) {
- /* Trailing hole */
- *pnum = nb_sectors;
- ret = BDRV_BLOCK_ZERO;
- } else if (ret < 0) {
- /* No info available, so pretend there are no holes */
- *pnum = nb_sectors;
- ret = BDRV_BLOCK_DATA;
- } else if (data == start) {
- /* On a data extent, compute sectors to the end of the extent,
- * possibly including a partial sector at EOF. */
- *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
- ret = BDRV_BLOCK_DATA;
- } else {
- /* On a hole, compute sectors to the beginning of the next extent. */
- assert(hole == start);
- *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
- ret = BDRV_BLOCK_ZERO;
- }
- *file = bs;
- return ret | BDRV_BLOCK_OFFSET_VALID | start;
-}
-
-static coroutine_fn BlockAIOCB *raw_aio_discard(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors,
- BlockCompletionFunc *cb, void *opaque)
-{
- BDRVRawState *s = bs->opaque;
-
- return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
- cb, opaque, QEMU_AIO_DISCARD);
-}
-
-static int coroutine_fn raw_co_write_zeroes(
- BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, BdrvRequestFlags flags)
-{
- BDRVRawState *s = bs->opaque;
-
- if (!(flags & BDRV_REQ_MAY_UNMAP)) {
- return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
- QEMU_AIO_WRITE_ZEROES);
- } else if (s->discard_zeroes) {
- return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
- QEMU_AIO_DISCARD);
- }
- return -ENOTSUP;
-}
-
-static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
-{
- BDRVRawState *s = bs->opaque;
-
- bdi->unallocated_blocks_are_zero = s->discard_zeroes;
- bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
- return 0;
-}
-
-static QemuOptsList raw_create_opts = {
- .name = "raw-create-opts",
- .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
- .desc = {
- {
- .name = BLOCK_OPT_SIZE,
- .type = QEMU_OPT_SIZE,
- .help = "Virtual disk size"
- },
- {
- .name = BLOCK_OPT_NOCOW,
- .type = QEMU_OPT_BOOL,
- .help = "Turn off copy-on-write (valid only on btrfs)"
- },
- {
- .name = BLOCK_OPT_PREALLOC,
- .type = QEMU_OPT_STRING,
- .help = "Preallocation mode (allowed values: off, falloc, full)"
- },
- { /* end of list */ }
- }
-};
-
-BlockDriver bdrv_file = {
- .format_name = "file",
- .protocol_name = "file",
- .instance_size = sizeof(BDRVRawState),
- .bdrv_needs_filename = true,
- .bdrv_probe = NULL, /* no probe for protocols */
- .bdrv_parse_filename = raw_parse_filename,
- .bdrv_file_open = raw_open,
- .bdrv_reopen_prepare = raw_reopen_prepare,
- .bdrv_reopen_commit = raw_reopen_commit,
- .bdrv_reopen_abort = raw_reopen_abort,
- .bdrv_close = raw_close,
- .bdrv_create = raw_create,
- .bdrv_has_zero_init = bdrv_has_zero_init_1,
- .bdrv_co_get_block_status = raw_co_get_block_status,
- .bdrv_co_write_zeroes = raw_co_write_zeroes,
-
- .bdrv_aio_readv = raw_aio_readv,
- .bdrv_aio_writev = raw_aio_writev,
- .bdrv_aio_flush = raw_aio_flush,
- .bdrv_aio_discard = raw_aio_discard,
- .bdrv_refresh_limits = raw_refresh_limits,
- .bdrv_io_plug = raw_aio_plug,
- .bdrv_io_unplug = raw_aio_unplug,
- .bdrv_flush_io_queue = raw_aio_flush_io_queue,
-
- .bdrv_truncate = raw_truncate,
- .bdrv_getlength = raw_getlength,
- .bdrv_get_info = raw_get_info,
- .bdrv_get_allocated_file_size
- = raw_get_allocated_file_size,
-
- .bdrv_detach_aio_context = raw_detach_aio_context,
- .bdrv_attach_aio_context = raw_attach_aio_context,
-
- .create_opts = &raw_create_opts,
-};
-
-/***********************************************/
-/* host device */
-
-#if defined(__APPLE__) && defined(__MACH__)
-static kern_return_t 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) {
- DPRINTF("Matching using %s\n", 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 {
- DPRINTF("Using %s as optical disc\n", 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)
-{
- /* The prefix is optional, just as for "file". */
- strstart(filename, "host_device:", &filename);
-
- qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
-}
-
-static bool hdev_is_sg(BlockDriverState *bs)
-{
-
-#if defined(__linux__)
-
- struct stat st;
- struct sg_scsi_id scsiid;
- int sg_version;
-
- if (stat(bs->filename, &st) >= 0 && S_ISCHR(st.st_mode) &&
- !bdrv_ioctl(bs, SG_GET_VERSION_NUM, &sg_version) &&
- !bdrv_ioctl(bs, SG_GET_SCSI_ID, &scsiid)) {
- DPRINTF("SG device found: type=%d, version=%d\n",
- 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__)
- 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(options, "filename", qstring_from_str(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, &local_err);
- if (ret < 0) {
- if (local_err) {
- 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 BlockAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
- unsigned long int req, void *buf,
- BlockCompletionFunc *cb, void *opaque)
-{
- BDRVRawState *s = bs->opaque;
- RawPosixAIOData *acb;
- ThreadPool *pool;
-
- if (fd_open(bs) < 0)
- return NULL;
-
- acb = g_new(RawPosixAIOData, 1);
- acb->bs = bs;
- acb->aio_type = QEMU_AIO_IOCTL;
- acb->aio_fildes = s->fd;
- acb->aio_offset = 0;
- acb->aio_ioctl_buf = buf;
- acb->aio_ioctl_cmd = req;
- pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
- return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
-}
-#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 BlockAIOCB *hdev_aio_discard(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors,
- BlockCompletionFunc *cb, void *opaque)
-{
- BDRVRawState *s = bs->opaque;
-
- if (fd_open(bs) < 0) {
- return NULL;
- }
- return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
- cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
-}
-
-static coroutine_fn int hdev_co_write_zeroes(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
-{
- BDRVRawState *s = bs->opaque;
- int rc;
-
- rc = fd_open(bs);
- if (rc < 0) {
- return rc;
- }
- if (!(flags & BDRV_REQ_MAY_UNMAP)) {
- return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
- QEMU_AIO_WRITE_ZEROES|QEMU_AIO_BLKDEV);
- } else if (s->discard_zeroes) {
- return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
- QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
- }
- return -ENOTSUP;
-}
-
-static int hdev_create(const char *filename, QemuOpts *opts,
- Error **errp)
-{
- int fd;
- int ret = 0;
- struct stat stat_buf;
- int64_t total_size = 0;
- bool has_prefix;
-
- /* This function is used by 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);
- if (ret < 0) {
- error_setg_errno(errp, -ret, "Could not normalize device path");
- 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;
- }
-
- qemu_close(fd);
- return ret;
-}
-
-static BlockDriver bdrv_host_device = {
- .format_name = "host_device",
- .protocol_name = "host_device",
- .instance_size = sizeof(BDRVRawState),
- .bdrv_needs_filename = true,
- .bdrv_probe_device = hdev_probe_device,
- .bdrv_parse_filename = hdev_parse_filename,
- .bdrv_file_open = hdev_open,
- .bdrv_close = raw_close,
- .bdrv_reopen_prepare = raw_reopen_prepare,
- .bdrv_reopen_commit = raw_reopen_commit,
- .bdrv_reopen_abort = raw_reopen_abort,
- .bdrv_create = hdev_create,
- .create_opts = &raw_create_opts,
- .bdrv_co_write_zeroes = hdev_co_write_zeroes,
-
- .bdrv_aio_readv = raw_aio_readv,
- .bdrv_aio_writev = raw_aio_writev,
- .bdrv_aio_flush = raw_aio_flush,
- .bdrv_aio_discard = hdev_aio_discard,
- .bdrv_refresh_limits = raw_refresh_limits,
- .bdrv_io_plug = raw_aio_plug,
- .bdrv_io_unplug = raw_aio_unplug,
- .bdrv_flush_io_queue = raw_aio_flush_io_queue,
-
- .bdrv_truncate = raw_truncate,
- .bdrv_getlength = raw_getlength,
- .bdrv_get_info = raw_get_info,
- .bdrv_get_allocated_file_size
- = raw_get_allocated_file_size,
- .bdrv_probe_blocksizes = hdev_probe_blocksizes,
- .bdrv_probe_geometry = hdev_probe_geometry,
-
- .bdrv_detach_aio_context = raw_detach_aio_context,
- .bdrv_attach_aio_context = raw_attach_aio_context,
-
- /* generic scsi device */
-#ifdef __linux__
- .bdrv_aio_ioctl = hdev_aio_ioctl,
-#endif
-};
-
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-static void cdrom_parse_filename(const char *filename, QDict *options,
- Error **errp)
-{
- /* The prefix is optional, just as for "file". */
- strstart(filename, "host_cdrom:", &filename);
-
- qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
-}
-#endif
-
-#ifdef __linux__
-static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
- Error **errp)
-{
- BDRVRawState *s = bs->opaque;
- Error *local_err = NULL;
- int ret;
-
- s->type = FTYPE_CD;
-
- /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
- ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- }
- return ret;
-}
-
-static int cdrom_probe_device(const char *filename)
-{
- int fd, ret;
- int prio = 0;
- struct stat st;
-
- fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
- if (fd < 0) {
- goto out;
- }
- ret = fstat(fd, &st);
- if (ret == -1 || !S_ISBLK(st.st_mode)) {
- goto outc;
- }
-
- /* Attempt to detect via a CDROM specific ioctl */
- ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
- if (ret >= 0)
- prio = 100;
-
-outc:
- qemu_close(fd);
-out:
- return prio;
-}
-
-static 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_create = hdev_create,
- .create_opts = &raw_create_opts,
-
- .bdrv_aio_readv = raw_aio_readv,
- .bdrv_aio_writev = raw_aio_writev,
- .bdrv_aio_flush = raw_aio_flush,
- .bdrv_refresh_limits = raw_refresh_limits,
- .bdrv_io_plug = raw_aio_plug,
- .bdrv_io_unplug = raw_aio_unplug,
- .bdrv_flush_io_queue = raw_aio_flush_io_queue,
-
- .bdrv_truncate = raw_truncate,
- .bdrv_getlength = raw_getlength,
- .has_variable_length = true,
- .bdrv_get_allocated_file_size
- = raw_get_allocated_file_size,
-
- .bdrv_detach_aio_context = raw_detach_aio_context,
- .bdrv_attach_aio_context = raw_attach_aio_context,
-
- /* removable device support */
- .bdrv_is_inserted = cdrom_is_inserted,
- .bdrv_eject = cdrom_eject,
- .bdrv_lock_medium = cdrom_lock_medium,
-
- /* generic scsi device */
- .bdrv_aio_ioctl = hdev_aio_ioctl,
-};
-#endif /* __linux__ */
-
-#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
-static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
- Error **errp)
-{
- BDRVRawState *s = bs->opaque;
- Error *local_err = NULL;
- int ret;
-
- s->type = FTYPE_CD;
-
- ret = raw_open_common(bs, options, flags, 0, &local_err);
- if (ret) {
- if (local_err) {
- error_propagate(errp, local_err);
- }
- return ret;
- }
-
- /* make sure the door isn't locked at this time */
- ioctl(s->fd, CDIOCALLOW);
- return 0;
-}
-
-static int cdrom_probe_device(const char *filename)
-{
- if (strstart(filename, "/dev/cd", NULL) ||
- strstart(filename, "/dev/acd", NULL))
- return 100;
- return 0;
-}
-
-static int cdrom_reopen(BlockDriverState *bs)
-{
- BDRVRawState *s = bs->opaque;
- int fd;
-
- /*
- * Force reread of possibly changed/newly loaded disc,
- * FreeBSD seems to not notice sometimes...
- */
- if (s->fd >= 0)
- qemu_close(s->fd);
- fd = qemu_open(bs->filename, s->open_flags, 0644);
- if (fd < 0) {
- s->fd = -1;
- return -EIO;
- }
- s->fd = fd;
-
- /* make sure the door isn't locked at this time */
- ioctl(s->fd, CDIOCALLOW);
- return 0;
-}
-
-static 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_create = hdev_create,
- .create_opts = &raw_create_opts,
-
- .bdrv_aio_readv = raw_aio_readv,
- .bdrv_aio_writev = raw_aio_writev,
- .bdrv_aio_flush = raw_aio_flush,
- .bdrv_refresh_limits = raw_refresh_limits,
- .bdrv_io_plug = raw_aio_plug,
- .bdrv_io_unplug = raw_aio_unplug,
- .bdrv_flush_io_queue = raw_aio_flush_io_queue,
-
- .bdrv_truncate = raw_truncate,
- .bdrv_getlength = raw_getlength,
- .has_variable_length = true,
- .bdrv_get_allocated_file_size
- = raw_get_allocated_file_size,
-
- .bdrv_detach_aio_context = raw_detach_aio_context,
- .bdrv_attach_aio_context = raw_attach_aio_context,
-
- /* removable device support */
- .bdrv_is_inserted = cdrom_is_inserted,
- .bdrv_eject = cdrom_eject,
- .bdrv_lock_medium = cdrom_lock_medium,
-};
-#endif /* __FreeBSD__ */
-
-static void bdrv_file_init(void)
-{
- /*
- * Register all the drivers. Note that order is important, the driver
- * registered last will get probed first.
- */
- bdrv_register(&bdrv_file);
- bdrv_register(&bdrv_host_device);
-#ifdef __linux__
- bdrv_register(&bdrv_host_cdrom);
-#endif
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
- bdrv_register(&bdrv_host_cdrom);
-#endif
-}
-
-block_init(bdrv_file_init);