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[PATCH v3 2/2] file-posix: add sg_get_max_segments that actually works w
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From: |
Tom Yan |
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Subject: |
[PATCH v3 2/2] file-posix: add sg_get_max_segments that actually works with sg |
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Date: |
Fri, 4 Sep 2020 09:51:04 +0800 |
sg devices have different major/minor than their corresponding
block devices. Using sysfs to get max segments never really worked
for them.
Fortunately the sg driver provides an ioctl to get sg_tablesize,
which is apparently equivalent to max segments.
Signed-off-by: Tom Yan <tom.ty89@gmail.com>
---
block/file-posix.c | 17 +-
block/file-posix.c.orig | 3920 +++++++++++++++++++++++++++++++++++++++
2 files changed, 3936 insertions(+), 1 deletion(-)
create mode 100644 block/file-posix.c.orig
diff --git a/block/file-posix.c b/block/file-posix.c
index 411a23cf99..9e37594145 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1178,6 +1178,21 @@ static int sg_get_max_transfer_length(int fd)
#endif
}
+static int sg_get_max_segments(int fd)
+{
+#ifdef SG_GET_SG_TABLESIZE
+ long max_segments = 0;
+
+ if (ioctl(fd, SG_GET_SG_TABLESIZE, &max_segments) == 0) {
+ return max_segments;
+ } else {
+ return -errno;
+ }
+#else
+ return -ENOSYS;
+#endif
+}
+
static int get_max_transfer_length(int fd)
{
#if defined(BLKSECTGET) && defined(BLKSSZGET)
@@ -1268,7 +1283,7 @@ static void hdev_refresh_limits(BlockDriverState *bs,
Error **errp)
bs->bl.max_transfer = pow2floor(ret);
}
- ret = get_max_segments(s->fd);
+ ret = bs->sg ? sg_get_max_segments(s->fd) : get_max_segments(s->fd);
if (ret > 0) {
bs->bl.max_transfer = MIN_NON_ZERO(bs->bl.max_transfer,
ret * qemu_real_host_page_size);
diff --git a/block/file-posix.c.orig b/block/file-posix.c.orig
new file mode 100644
index 0000000000..411a23cf99
--- /dev/null
+++ b/block/file-posix.c.orig
@@ -0,0 +1,3920 @@
+/*
+ * 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 "qemu-common.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 "qemu/units.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 <sys/vfs.h>
+#include <linux/cdrom.h>
+#include <linux/fd.h>
+#include <linux/fs.h>
+#include <linux/hdreg.h>
+#include <linux/magic.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;
+ int perm_change_flags;
+ 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 use_linux_io_uring:1;
+ bool page_cache_inconsistent:1;
+ bool has_fallocate;
+ bool needs_alignment;
+ bool drop_cache;
+ bool check_cache_dropped;
+ struct {
+ uint64_t discard_nb_ok;
+ uint64_t discard_nb_failed;
+ uint64_t discard_bytes_ok;
+ } stats;
+
+ 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_file_open(errp, errno, 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
+}
+
+/*
+ * Returns true if no alignment restrictions are necessary even for files
+ * opened with O_DIRECT.
+ *
+ * raw_probe_alignment() probes the required alignment and assume that 1 means
+ * the probing failed, so it falls back to a safe default of 4k. This can be
+ * avoided if we know that byte alignment is okay for the file.
+ */
+static bool dio_byte_aligned(int fd)
+{
+#ifdef __linux__
+ struct statfs buf;
+ int ret;
+
+ ret = fstatfs(fd, &buf);
+ if (ret == 0 && buf.f_type == NFS_SUPER_MAGIC) {
+ return true;
+ }
+#endif
+ return false;
+}
+
+/* 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, qemu_real_host_page_size);
+ size_t alignments[] = {1, 512, 1024, 2048, 4096};
+
+ /* 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. First try
+ * to detect request alignment, since it is more likely to succeed. Then
+ * try to detect buf_align, which cannot be detected in some cases (e.g.
+ * Gluster). If buf_align cannot be detected, we fallback to the value of
+ * request_alignment.
+ */
+
+ if (!bs->bl.request_alignment) {
+ int i;
+ size_t align;
+ buf = qemu_memalign(max_align, max_align);
+ for (i = 0; i < ARRAY_SIZE(alignments); i++) {
+ align = alignments[i];
+ if (raw_is_io_aligned(fd, buf, align)) {
+ /* Fallback to safe value. */
+ bs->bl.request_alignment = (align != 1) ? align : max_align;
+ break;
+ }
+ }
+ qemu_vfree(buf);
+ }
+
+ if (!s->buf_align) {
+ int i;
+ size_t align;
+ buf = qemu_memalign(max_align, 2 * max_align);
+ for (i = 0; i < ARRAY_SIZE(alignments); i++) {
+ align = alignments[i];
+ if (raw_is_io_aligned(fd, buf + align, max_align)) {
+ /* Fallback to request_alignment. */
+ s->buf_align = (align != 1) ? align : bs->bl.request_alignment;
+ 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 int check_hdev_writable(int fd)
+{
+#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(fd, &st)) {
+ return -errno;
+ }
+
+ if (!S_ISBLK(st.st_mode)) {
+ return 0;
+ }
+
+ if (ioctl(fd, BLKROGET, &readonly) < 0) {
+ return -errno;
+ }
+
+ if (readonly) {
+ return -EACCES;
+ }
+#endif /* defined(BLKROGET) */
+ return 0;
+}
+
+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, io_uring)",
+ },
+ {
+ .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);
+ if (!qemu_opts_absorb_qdict(opts, options, errp)) {
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ filename = qemu_opt_get(opts, "filename");
+
+ ret = raw_normalize_devicepath(&filename, errp);
+ if (ret != 0) {
+ goto fail;
+ }
+
+ if (bdrv_flags & BDRV_O_NATIVE_AIO) {
+ aio_default = BLOCKDEV_AIO_OPTIONS_NATIVE;
+#ifdef CONFIG_LINUX_IO_URING
+ } else if (bdrv_flags & BDRV_O_IO_URING) {
+ aio_default = BLOCKDEV_AIO_OPTIONS_IO_URING;
+#endif
+ } else {
+ aio_default = 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);
+#ifdef CONFIG_LINUX_IO_URING
+ s->use_linux_io_uring = (aio == BLOCKDEV_AIO_OPTIONS_IO_URING);
+#endif
+
+ 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_file_open(errp, -ret, filename);
+ if (ret == -EROFS) {
+ ret = -EACCES;
+ }
+ goto fail;
+ }
+ s->fd = fd;
+
+ /* Check s->open_flags rather than bdrv_flags due to auto-read-only */
+ if (s->open_flags & O_RDWR) {
+ ret = check_hdev_writable(s->fd);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "The device is not writable");
+ goto fail;
+ }
+ }
+
+ 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) */
+
+#ifdef CONFIG_LINUX_IO_URING
+ if (s->use_linux_io_uring) {
+ if (!aio_setup_linux_io_uring(bdrv_get_aio_context(bs), errp)) {
+ error_prepend(errp, "Unable to use io_uring: ");
+ goto fail;
+ }
+ }
+#else
+ if (s->use_linux_io_uring) {
+ error_setg(errp, "aio=io_uring was specified, but is not supported "
+ "in this build.");
+ ret = -EINVAL;
+ goto fail;
+ }
+#endif /* !defined(CONFIG_LINUX_IO_URING) */
+
+ s->has_discard = true;
+ s->has_write_zeroes = true;
+ if ((bs->open_flags & BDRV_O_NOCACHE) != 0 && !dio_byte_aligned(s->fd)) {
+ 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;
+ if (S_ISREG(st.st_mode)) {
+ /* When extending regular files, we get zeros from the OS */
+ bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
+ }
+ ret = 0;
+fail:
+ if (ret < 0 && s->fd != -1) {
+ qemu_close(s->fd);
+ }
+ 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);
+ }
+ /* 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;
+ }
+ }
+ }
+
+ if (fd != -1 && (*open_flags & O_RDWR)) {
+ ret = check_hdev_writable(fd);
+ if (ret < 0) {
+ qemu_close(fd);
+ error_setg_errno(errp, -ret, "The device is not writable");
+ 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);
+ if (!qemu_opts_absorb_qdict(opts, state->options, errp)) {
+ 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 sg_get_max_transfer_length(int fd)
+{
+#ifdef BLKSECTGET
+ int max_bytes = 0;
+
+ if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
+ return max_bytes;
+ } else {
+ return -errno;
+ }
+#else
+ return -ENOSYS;
+#endif
+}
+
+static int get_max_transfer_length(int fd)
+{
+#if defined(BLKSECTGET) && defined(BLKSSZGET)
+ int sect = 0;
+ int ssz = 0;
+
+ if (ioctl(fd, BLKSECTGET, §) == 0 &&
+ ioctl(fd, BLKSSZGET, &ssz) == 0) {
+ return sect * ssz;
+ } else {
+ return -errno;
+ }
+#else
+ return -ENOSYS;
+#endif
+}
+
+static int get_max_segments(int fd)
+{
+#ifdef CONFIG_LINUX
+ char buf[32];
+ const char *end;
+ char *sysfspath = NULL;
+ int ret;
+ int sysfd = -1;
+ long max_segments;
+ struct stat st;
+
+ if (fstat(fd, &st)) {
+ ret = -errno;
+ goto out;
+ }
+
+ sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
+ major(st.st_rdev), minor(st.st_rdev));
+ sysfd = open(sysfspath, O_RDONLY);
+ if (sysfd == -1) {
+ ret = -errno;
+ goto out;
+ }
+ do {
+ ret = read(sysfd, 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 (sysfd != -1) {
+ close(sysfd);
+ }
+ g_free(sysfspath);
+ return ret;
+#else
+ return -ENOTSUP;
+#endif
+}
+
+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, qemu_real_host_page_size);
+}
+
+static void hdev_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+ BDRVRawState *s = bs->opaque;
+
+ /* BLKSECTGET has always been implemented wrongly in the sg driver
+ and BLKSSZGET has never been supported by it*/
+ int ret = bs->sg ? sg_get_max_transfer_length(s->fd) :
+ get_max_transfer_length(s->fd);
+
+ if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) {
+ bs->bl.max_transfer = pow2floor(ret);
+ }
+
+ ret = get_max_segments(s->fd);
+ if (ret > 0) {
+ bs->bl.max_transfer = MIN_NON_ZERO(bs->bl.max_transfer,
+ ret * qemu_real_host_page_size);
+ }
+
+ raw_refresh_limits(bs, errp);
+}
+
+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;
+ }
+}
+
+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);
+ if (ret == -ENOTSUP) {
+ s->has_write_zeroes = false;
+ }
+ }
+#endif
+
+ return ret;
+}
+
+static int handle_aiocb_write_zeroes(void *opaque)
+{
+ RawPosixAIOData *aiocb = opaque;
+#ifdef CONFIG_FALLOCATE
+ BDRVRawState *s = aiocb->bs->opaque;
+ int64_t len;
+#endif
+
+ if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
+ return handle_aiocb_write_zeroes_block(aiocb);
+ }
+
+#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 == -EINVAL) {
+ /*
+ * Allow falling back to pwrite for file systems that
+ * do not support fallocate() for an unaligned byte range.
+ */
+ return -ENOTSUP;
+ }
+ 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;
+
+ /* First try to write zeros and unmap at the same time */
+
+#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
+ int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+ aiocb->aio_offset, aiocb->aio_nbytes);
+ switch (ret) {
+ case -ENOTSUP:
+ case -EINVAL:
+ break;
+ default:
+ return ret;
+ }
+#endif
+
+ /* If we couldn't manage to unmap while guaranteed that the area reads as
+ * all-zero afterwards, just write zeroes without unmapping */
+ return handle_aiocb_write_zeroes(aiocb);
+}
+
+#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_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;
+}
+
+/*
+ * Help alignment probing by allocating the first block.
+ *
+ * When reading with direct I/O from unallocated area on Gluster backed by XFS,
+ * reading succeeds regardless of request length. In this case we fallback to
+ * safe alignment which is not optimal. Allocating the first block avoids this
+ * fallback.
+ *
+ * fd may be opened with O_DIRECT, but we don't know the buffer alignment or
+ * request alignment, so we use safe values.
+ *
+ * Returns: 0 on success, -errno on failure. Since this is an optimization,
+ * caller may ignore failures.
+ */
+static int allocate_first_block(int fd, size_t max_size)
+{
+ size_t write_size = (max_size < MAX_BLOCKSIZE)
+ ? BDRV_SECTOR_SIZE
+ : MAX_BLOCKSIZE;
+ size_t max_align = MAX(MAX_BLOCKSIZE, qemu_real_host_page_size);
+ void *buf;
+ ssize_t n;
+ int ret;
+
+ buf = qemu_memalign(max_align, write_size);
+ memset(buf, 0, write_size);
+
+ do {
+ n = pwrite(fd, buf, write_size, 0);
+ } while (n == -1 && errno == EINTR);
+
+ ret = (n == -1) ? -errno : 0;
+
+ qemu_vfree(buf);
+ 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 if (current_length == 0) {
+ /*
+ * posix_fallocate() uses fallocate() if the filesystem
+ * supports it, or fallback to manually writing zeroes. If
+ * fallocate() was used, unaligned reads from the fallocated
+ * area in raw_probe_alignment() will succeed, hence we need to
+ * allocate the first block.
+ *
+ * Optimize future alignment probing; ignore failures.
+ */
+ allocate_first_block(fd, offset);
+ }
+ } 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");
+ } else if (current_length == 0 && offset > current_length) {
+ /* Optimize future alignment probing; ignore failures. */
+ allocate_first_block(fd, offset);
+ }
+ 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;
+
+ /*
+ * When using O_DIRECT, the request must be aligned to be able to use
+ * either libaio or io_uring interface. If not fail back to regular thread
+ * pool read/write code which emulates this for us if we
+ * set QEMU_AIO_MISALIGNED.
+ */
+ if (s->needs_alignment && !bdrv_qiov_is_aligned(bs, qiov)) {
+ type |= QEMU_AIO_MISALIGNED;
+#ifdef CONFIG_LINUX_IO_URING
+ } else if (s->use_linux_io_uring) {
+ LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs));
+ assert(qiov->size == bytes);
+ return luring_co_submit(bs, aio, s->fd, offset, qiov, type);
+#endif
+#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)
+{
+ BDRVRawState __attribute__((unused)) *s = bs->opaque;
+#ifdef CONFIG_LINUX_AIO
+ if (s->use_linux_aio) {
+ LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
+ laio_io_plug(bs, aio);
+ }
+#endif
+#ifdef CONFIG_LINUX_IO_URING
+ if (s->use_linux_io_uring) {
+ LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs));
+ luring_io_plug(bs, aio);
+ }
+#endif
+}
+
+static void raw_aio_unplug(BlockDriverState *bs)
+{
+ BDRVRawState __attribute__((unused)) *s = bs->opaque;
+#ifdef CONFIG_LINUX_AIO
+ if (s->use_linux_aio) {
+ LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
+ laio_io_unplug(bs, aio);
+ }
+#endif
+#ifdef CONFIG_LINUX_IO_URING
+ if (s->use_linux_io_uring) {
+ LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs));
+ luring_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,
+ };
+
+#ifdef CONFIG_LINUX_IO_URING
+ if (s->use_linux_io_uring) {
+ LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs));
+ return luring_co_submit(bs, aio, s->fd, 0, NULL, QEMU_AIO_FLUSH);
+ }
+#endif
+ return raw_thread_pool_submit(bs, handle_aiocb_flush, &acb);
+}
+
+static void raw_aio_attach_aio_context(BlockDriverState *bs,
+ AioContext *new_context)
+{
+ BDRVRawState __attribute__((unused)) *s = bs->opaque;
+#ifdef CONFIG_LINUX_AIO
+ if (s->use_linux_aio) {
+ Error *local_err = NULL;
+ 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
+#ifdef CONFIG_LINUX_IO_URING
+ if (s->use_linux_io_uring) {
+ Error *local_err;
+ if (!aio_setup_linux_io_uring(new_context, &local_err)) {
+ error_reportf_err(local_err, "Unable to use linux io_uring, "
+ "falling back to thread pool: ");
+ s->use_linux_io_uring = 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,
+ bool exact, PreallocMode prealloc,
+ BdrvRequestFlags flags, 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)) {
+ /* Always resizes to the exact @offset */
+ 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)) {
+ int64_t cur_length = raw_getlength(bs);
+
+ if (offset != cur_length && exact) {
+ error_setg(errp, "Cannot resize device files");
+ return -ENOTSUP;
+ } else if (offset > cur_length) {
+ 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;
+ }
+ if (!file_opts->has_extent_size_hint) {
+ file_opts->extent_size_hint = 1 * MiB;
+ }
+ if (file_opts->extent_size_hint > UINT32_MAX) {
+ result = -EINVAL;
+ error_setg(errp, "Extent size hint is too large");
+ goto out;
+ }
+
+ /* 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
+ }
+#ifdef FS_IOC_FSSETXATTR
+ /*
+ * Try to set the extent size hint. Failure is not fatal, and a warning is
+ * only printed if the option was explicitly specified.
+ */
+ {
+ struct fsxattr attr;
+ result = ioctl(fd, FS_IOC_FSGETXATTR, &attr);
+ if (result == 0) {
+ attr.fsx_xflags |= FS_XFLAG_EXTSIZE;
+ attr.fsx_extsize = file_opts->extent_size_hint;
+ result = ioctl(fd, FS_IOC_FSSETXATTR, &attr);
+ }
+ if (result < 0 && file_opts->has_extent_size_hint &&
+ file_opts->extent_size_hint)
+ {
+ warn_report("Failed to set extent size hint: %s",
+ strerror(errno));
+ }
+ }
+#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(BlockDriver *drv,
+ const char *filename,
+ QemuOpts *opts,
+ Error **errp)
+{
+ BlockdevCreateOptions options;
+ int64_t total_size = 0;
+ int64_t extent_size_hint = 0;
+ bool has_extent_size_hint = false;
+ 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);
+ if (qemu_opt_get(opts, BLOCK_OPT_EXTENT_SIZE_HINT)) {
+ has_extent_size_hint = true;
+ extent_size_hint =
+ qemu_opt_get_size_del(opts, BLOCK_OPT_EXTENT_SIZE_HINT, -1);
+ }
+ 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,
+ .has_extent_size_hint = has_extent_size_hint,
+ .extent_size_hint = extent_size_hint,
+ },
+ };
+ return raw_co_create(&options, errp);
+}
+
+static int coroutine_fn raw_co_delete_file(BlockDriverState *bs,
+ Error **errp)
+{
+ struct stat st;
+ int ret;
+
+ if (!(stat(bs->filename, &st) == 0) || !S_ISREG(st.st_mode)) {
+ error_setg_errno(errp, ENOENT, "%s is not a regular file",
+ bs->filename);
+ return -ENOENT;
+ }
+
+ ret = unlink(bs->filename);
+ if (ret < 0) {
+ ret = -errno;
+ error_setg_errno(errp, -ret, "Error when deleting file %s",
+ bs->filename);
+ }
+
+ return ret;
+}
+
+/*
+ * 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) {
+ break;
+ }
+ }
+ if (i < vec_end) {
+ 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 void raw_account_discard(BDRVRawState *s, uint64_t nbytes, int ret)
+{
+ if (ret) {
+ s->stats.discard_nb_failed++;
+ } else {
+ s->stats.discard_nb_ok++;
+ s->stats.discard_bytes_ok += nbytes;
+ }
+}
+
+static coroutine_fn int
+raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int bytes, bool blkdev)
+{
+ BDRVRawState *s = bs->opaque;
+ RawPosixAIOData acb;
+ int ret;
+
+ 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;
+ }
+
+ ret = raw_thread_pool_submit(bs, handle_aiocb_discard, &acb);
+ raw_account_discard(s, bytes, ret);
+ return ret;
+}
+
+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;
+
+#ifdef CONFIG_FALLOCATE
+ if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) {
+ BdrvTrackedRequest *req;
+ uint64_t end;
+
+ /*
+ * This is a workaround for a bug in the Linux XFS driver,
+ * where writes submitted through the AIO interface will be
+ * discarded if they happen beyond a concurrently running
+ * fallocate() that increases the file length (i.e., both the
+ * write and the fallocate() happen beyond the EOF).
+ *
+ * To work around it, we extend the tracked request for this
+ * zero write until INT64_MAX (effectively infinity), and mark
+ * it as serializing.
+ *
+ * We have to enable this workaround for all filesystems and
+ * AIO modes (not just XFS with aio=native), because for
+ * remote filesystems we do not know the host configuration.
+ */
+
+ req = bdrv_co_get_self_request(bs);
+ assert(req);
+ assert(req->type == BDRV_TRACKED_WRITE);
+ assert(req->offset <= offset);
+ assert(req->offset + req->bytes >= offset + bytes);
+
+ end = INT64_MAX & -(uint64_t)bs->bl.request_alignment;
+ req->bytes = end - req->offset;
+ req->overlap_bytes = req->bytes;
+
+ bdrv_mark_request_serialising(req, bs->bl.request_alignment);
+ }
+#endif
+
+ 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)
+{
+ return 0;
+}
+
+static BlockStatsSpecificFile get_blockstats_specific_file(BlockDriverState
*bs)
+{
+ BDRVRawState *s = bs->opaque;
+ return (BlockStatsSpecificFile) {
+ .discard_nb_ok = s->stats.discard_nb_ok,
+ .discard_nb_failed = s->stats.discard_nb_failed,
+ .discard_bytes_ok = s->stats.discard_bytes_ok,
+ };
+}
+
+static BlockStatsSpecific *raw_get_specific_stats(BlockDriverState *bs)
+{
+ BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1);
+
+ stats->driver = BLOCKDEV_DRIVER_FILE;
+ stats->u.file = get_blockstats_specific_file(bs);
+
+ return stats;
+}
+
+static BlockStatsSpecific *hdev_get_specific_stats(BlockDriverState *bs)
+{
+ BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1);
+
+ stats->driver = BLOCKDEV_DRIVER_HOST_DEVICE;
+ stats->u.host_device = get_blockstats_specific_file(bs);
+
+ return stats;
+}
+
+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"
+#ifdef CONFIG_POSIX_FALLOCATE
+ ", falloc"
+#endif
+ ", full)"
+ },
+ {
+ .name = BLOCK_OPT_EXTENT_SIZE_HINT,
+ .type = QEMU_OPT_SIZE,
+ .help = "Extent size hint for the image file, 0 to disable"
+ },
+ { /* 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;
+ s->perm_change_flags = rs->open_flags;
+ } 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;
+ s->perm_change_flags = open_flags;
+ }
+ }
+
+ /* 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->open_flags = s->perm_change_flags;
+ }
+ 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_delete_file = raw_co_delete_file,
+
+ .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_get_specific_stats = raw_get_specific_stats,
+ .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 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;
+ 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, errp);
+ if (ret < 0) {
+#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);
+
+ 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)
+{
+ BDRVRawState *s = bs->opaque;
+ int ret;
+
+ ret = fd_open(bs);
+ if (ret < 0) {
+ raw_account_discard(s, bytes, ret);
+ 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 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 = bdrv_co_create_opts_simple,
+ .create_opts = &bdrv_create_opts_simple,
+ .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 = hdev_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_get_specific_stats = hdev_get_specific_stats,
+ .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 = bdrv_co_create_opts_simple,
+ .create_opts = &bdrv_create_opts_simple,
+ .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 = hdev_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;
+ int ret;
+
+ s->type = FTYPE_CD;
+
+ ret = raw_open_common(bs, options, flags, 0, true, errp);
+ if (ret) {
+ 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 = bdrv_co_create_opts_simple,
+ .create_opts = &bdrv_create_opts_simple,
+ .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);
--
2.28.0