block-obj-y += nbd.o block.o blockjob.o aes.o qemu-config.o
block-obj-y += thread-pool.o qemu-progress.o qemu-sockets.o uri.o notify.o
block-obj-y += $(coroutine-obj-y) $(qobject-obj-y) $(version-obj-y)
-block-obj-$(CONFIG_POSIX) += posix-aio-compat.o
block-obj-$(CONFIG_POSIX) += event_notifier-posix.o aio-posix.o
block-obj-$(CONFIG_WIN32) += event_notifier-win32.o aio-win32.o
block-obj-$(CONFIG_LINUX_AIO) += linux-aio.o
#define QEMU_AIO_MISALIGNED 0x1000
-/* posix-aio-compat.c - thread pool based implementation */
-BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque, int type);
-BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
- unsigned long int req, void *buf,
- BlockDriverCompletionFunc *cb, void *opaque);
-
/* linux-aio.c - Linux native implementation */
void *laio_init(void);
BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
#include "qemu-log.h"
#include "block_int.h"
#include "module.h"
+#include "trace.h"
+#include "thread-pool.h"
+#include "iov.h"
#include "block/raw-posix-aio.h"
#if defined(__APPLE__) && (__MACH__)
static int fd_open(BlockDriverState *bs);
static int64_t raw_getlength(BlockDriverState *bs);
+typedef struct RawPosixAIOData {
+ BlockDriverState *bs;
+ int aio_fildes;
+ union {
+ struct iovec *aio_iov;
+ void *aio_ioctl_buf;
+ };
+ int aio_niov;
+ size_t aio_nbytes;
+#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
+ off_t aio_offset;
+ int aio_type;
+} RawPosixAIOData;
+
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
static int cdrom_reopen(BlockDriverState *bs);
#endif
return 1;
}
+static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
+{
+ int ret;
+
+ ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
+ if (ret == -1) {
+ return -errno;
+ }
+
+ /*
+ * This looks weird, but the aio code only considers a request
+ * successful if it has written the full number of bytes.
+ *
+ * Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
+ * so in fact we return the ioctl command here to make posix_aio_read()
+ * happy..
+ */
+ return aiocb->aio_nbytes;
+}
+
+static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
+{
+ int ret;
+
+ ret = qemu_fdatasync(aiocb->aio_fildes);
+ if (ret == -1) {
+ return -errno;
+ }
+ return 0;
+}
+
+#ifdef CONFIG_PREADV
+
+static bool preadv_present = true;
+
+static ssize_t
+qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
+{
+ return preadv(fd, iov, nr_iov, offset);
+}
+
+static ssize_t
+qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
+{
+ return pwritev(fd, iov, nr_iov, offset);
+}
+
+#else
+
+static bool preadv_present = false;
+
+static ssize_t
+qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
+{
+ return -ENOSYS;
+}
+
+static ssize_t
+qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
+{
+ return -ENOSYS;
+}
+
+#endif
+
+static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
+{
+ ssize_t len;
+
+ do {
+ if (aiocb->aio_type & QEMU_AIO_WRITE)
+ len = qemu_pwritev(aiocb->aio_fildes,
+ aiocb->aio_iov,
+ aiocb->aio_niov,
+ aiocb->aio_offset);
+ else
+ len = qemu_preadv(aiocb->aio_fildes,
+ aiocb->aio_iov,
+ aiocb->aio_niov,
+ aiocb->aio_offset);
+ } while (len == -1 && errno == EINTR);
+
+ if (len == -1) {
+ return -errno;
+ }
+ return len;
+}
+
+/*
+ * Read/writes the data to/from a given linear buffer.
+ *
+ * Returns the number of bytes handles or -errno in case of an error. Short
+ * reads are only returned if the end of the file is reached.
+ */
+static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
+{
+ ssize_t offset = 0;
+ ssize_t len;
+
+ while (offset < aiocb->aio_nbytes) {
+ if (aiocb->aio_type & QEMU_AIO_WRITE) {
+ len = pwrite(aiocb->aio_fildes,
+ (const char *)buf + offset,
+ aiocb->aio_nbytes - offset,
+ aiocb->aio_offset + offset);
+ } else {
+ len = pread(aiocb->aio_fildes,
+ buf + offset,
+ aiocb->aio_nbytes - offset,
+ aiocb->aio_offset + offset);
+ }
+ if (len == -1 && errno == EINTR) {
+ continue;
+ } else if (len == -1) {
+ offset = -errno;
+ break;
+ } else if (len == 0) {
+ break;
+ }
+ offset += len;
+ }
+
+ return offset;
+}
+
+static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
+{
+ ssize_t nbytes;
+ char *buf;
+
+ if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
+ /*
+ * If there is just a single buffer, and it is properly aligned
+ * we can just use plain pread/pwrite without any problems.
+ */
+ if (aiocb->aio_niov == 1) {
+ return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
+ }
+ /*
+ * We have more than one iovec, and all are properly aligned.
+ *
+ * Try preadv/pwritev first and fall back to linearizing the
+ * buffer if it's not supported.
+ */
+ if (preadv_present) {
+ nbytes = handle_aiocb_rw_vector(aiocb);
+ if (nbytes == aiocb->aio_nbytes ||
+ (nbytes < 0 && nbytes != -ENOSYS)) {
+ return nbytes;
+ }
+ preadv_present = false;
+ }
+
+ /*
+ * XXX(hch): short read/write. no easy way to handle the reminder
+ * using these interfaces. For now retry using plain
+ * pread/pwrite?
+ */
+ }
+
+ /*
+ * Ok, we have to do it the hard way, copy all segments into
+ * a single aligned buffer.
+ */
+ buf = qemu_blockalign(aiocb->bs, aiocb->aio_nbytes);
+ if (aiocb->aio_type & QEMU_AIO_WRITE) {
+ char *p = buf;
+ int i;
+
+ for (i = 0; i < aiocb->aio_niov; ++i) {
+ memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
+ p += aiocb->aio_iov[i].iov_len;
+ }
+ }
+
+ nbytes = handle_aiocb_rw_linear(aiocb, buf);
+ if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
+ char *p = buf;
+ size_t count = aiocb->aio_nbytes, copy;
+ int i;
+
+ for (i = 0; i < aiocb->aio_niov && count; ++i) {
+ copy = count;
+ if (copy > aiocb->aio_iov[i].iov_len) {
+ copy = aiocb->aio_iov[i].iov_len;
+ }
+ memcpy(aiocb->aio_iov[i].iov_base, p, copy);
+ p += copy;
+ count -= copy;
+ }
+ }
+ qemu_vfree(buf);
+
+ return nbytes;
+}
+
+static int aio_worker(void *arg)
+{
+ RawPosixAIOData *aiocb = arg;
+ ssize_t ret = 0;
+
+ switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
+ case QEMU_AIO_READ:
+ ret = handle_aiocb_rw(aiocb);
+ if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->bs->growable) {
+ iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
+ 0, aiocb->aio_nbytes - ret);
+
+ ret = aiocb->aio_nbytes;
+ }
+ if (ret == aiocb->aio_nbytes) {
+ ret = 0;
+ } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
+ ret = -EINVAL;
+ }
+ break;
+ case QEMU_AIO_WRITE:
+ ret = handle_aiocb_rw(aiocb);
+ if (ret == aiocb->aio_nbytes) {
+ ret = 0;
+ } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
+ ret = -EINVAL;
+ }
+ break;
+ case QEMU_AIO_FLUSH:
+ ret = handle_aiocb_flush(aiocb);
+ break;
+ case QEMU_AIO_IOCTL:
+ ret = handle_aiocb_ioctl(aiocb);
+ break;
+ default:
+ fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
+ ret = -EINVAL;
+ break;
+ }
+
+ g_slice_free(RawPosixAIOData, aiocb);
+ return ret;
+}
+
+static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque, int type)
+{
+ RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
+
+ acb->bs = bs;
+ acb->aio_type = type;
+ acb->aio_fildes = fd;
+
+ if (qiov) {
+ acb->aio_iov = qiov->iov;
+ acb->aio_niov = qiov->niov;
+ }
+ acb->aio_nbytes = nb_sectors * 512;
+ acb->aio_offset = sector_num * 512;
+
+ trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
+ return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
+}
+
+static BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
+ unsigned long int req, void *buf,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
+
+ acb->bs = bs;
+ acb->aio_type = QEMU_AIO_IOCTL;
+ acb->aio_fildes = fd;
+ acb->aio_offset = 0;
+ acb->aio_ioctl_buf = buf;
+ acb->aio_ioctl_cmd = req;
+
+ return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
+}
+
static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque, int type)
+++ /dev/null
-/*
- * QEMU posix-aio emulation
- *
- * Copyright IBM, Corp. 2008
- *
- * Authors:
- * Anthony Liguori <aliguori@us.ibm.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <pthread.h>
-#include <unistd.h>
-#include <errno.h>
-#include <time.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-#include "qemu-queue.h"
-#include "osdep.h"
-#include "sysemu.h"
-#include "qemu-common.h"
-#include "trace.h"
-#include "thread-pool.h"
-#include "block_int.h"
-#include "iov.h"
-
-#include "block/raw-posix-aio.h"
-
-struct qemu_paiocb {
- BlockDriverAIOCB common;
- int aio_fildes;
- union {
- struct iovec *aio_iov;
- void *aio_ioctl_buf;
- };
- int aio_niov;
- size_t aio_nbytes;
-#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
- off_t aio_offset;
- int aio_type;
-};
-
-#ifdef CONFIG_PREADV
-static int preadv_present = 1;
-#else
-static int preadv_present = 0;
-#endif
-
-static ssize_t handle_aiocb_ioctl(struct qemu_paiocb *aiocb)
-{
- int ret;
-
- ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
- if (ret == -1)
- return -errno;
-
- /*
- * This looks weird, but the aio code only considers a request
- * successful if it has written the full number of bytes.
- *
- * Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
- * so in fact we return the ioctl command here to make posix_aio_read()
- * happy..
- */
- return aiocb->aio_nbytes;
-}
-
-static ssize_t handle_aiocb_flush(struct qemu_paiocb *aiocb)
-{
- int ret;
-
- ret = qemu_fdatasync(aiocb->aio_fildes);
- if (ret == -1)
- return -errno;
- return 0;
-}
-
-#ifdef CONFIG_PREADV
-
-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 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(struct qemu_paiocb *aiocb)
-{
- ssize_t len;
-
- do {
- if (aiocb->aio_type & QEMU_AIO_WRITE)
- len = qemu_pwritev(aiocb->aio_fildes,
- aiocb->aio_iov,
- aiocb->aio_niov,
- aiocb->aio_offset);
- else
- len = qemu_preadv(aiocb->aio_fildes,
- aiocb->aio_iov,
- aiocb->aio_niov,
- aiocb->aio_offset);
- } while (len == -1 && errno == EINTR);
-
- if (len == -1)
- return -errno;
- return len;
-}
-
-/*
- * Read/writes the data to/from a given linear buffer.
- *
- * Returns the number of bytes handles or -errno in case of an error. Short
- * reads are only returned if the end of the file is reached.
- */
-static ssize_t handle_aiocb_rw_linear(struct qemu_paiocb *aiocb, char *buf)
-{
- ssize_t offset = 0;
- ssize_t len;
-
- while (offset < aiocb->aio_nbytes) {
- if (aiocb->aio_type & QEMU_AIO_WRITE)
- len = pwrite(aiocb->aio_fildes,
- (const char *)buf + offset,
- aiocb->aio_nbytes - offset,
- aiocb->aio_offset + offset);
- else
- len = pread(aiocb->aio_fildes,
- buf + offset,
- aiocb->aio_nbytes - offset,
- aiocb->aio_offset + offset);
-
- if (len == -1 && errno == EINTR)
- continue;
- else if (len == -1) {
- offset = -errno;
- break;
- } else if (len == 0)
- break;
-
- offset += len;
- }
-
- return offset;
-}
-
-static ssize_t handle_aiocb_rw(struct qemu_paiocb *aiocb)
-{
- ssize_t nbytes;
- char *buf;
-
- if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
- /*
- * If there is just a single buffer, and it is properly aligned
- * we can just use plain pread/pwrite without any problems.
- */
- if (aiocb->aio_niov == 1)
- return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
-
- /*
- * We have more than one iovec, and all are properly aligned.
- *
- * Try preadv/pwritev first and fall back to linearizing the
- * buffer if it's not supported.
- */
- if (preadv_present) {
- nbytes = handle_aiocb_rw_vector(aiocb);
- if (nbytes == aiocb->aio_nbytes)
- return nbytes;
- if (nbytes < 0 && nbytes != -ENOSYS)
- return nbytes;
- preadv_present = 0;
- }
-
- /*
- * XXX(hch): short read/write. no easy way to handle the reminder
- * using these interfaces. For now retry using plain
- * pread/pwrite?
- */
- }
-
- /*
- * Ok, we have to do it the hard way, copy all segments into
- * a single aligned buffer.
- */
- buf = qemu_blockalign(aiocb->common.bs, aiocb->aio_nbytes);
- if (aiocb->aio_type & QEMU_AIO_WRITE) {
- char *p = buf;
- int i;
-
- for (i = 0; i < aiocb->aio_niov; ++i) {
- memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
- p += aiocb->aio_iov[i].iov_len;
- }
- }
-
- nbytes = handle_aiocb_rw_linear(aiocb, buf);
- if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
- char *p = buf;
- size_t count = aiocb->aio_nbytes, copy;
- int i;
-
- for (i = 0; i < aiocb->aio_niov && count; ++i) {
- copy = count;
- if (copy > aiocb->aio_iov[i].iov_len)
- copy = aiocb->aio_iov[i].iov_len;
- memcpy(aiocb->aio_iov[i].iov_base, p, copy);
- p += copy;
- count -= copy;
- }
- }
- qemu_vfree(buf);
-
- return nbytes;
-}
-
-static int aio_worker(void *arg)
-{
- struct qemu_paiocb *aiocb = arg;
- ssize_t ret = 0;
-
- switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
- case QEMU_AIO_READ:
- ret = handle_aiocb_rw(aiocb);
- if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->common.bs->growable) {
- /* A short read means that we have reached EOF. Pad the buffer
- * with zeros for bytes after EOF. */
- iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
- 0, aiocb->aio_nbytes - ret);
-
- ret = aiocb->aio_nbytes;
- }
- if (ret == aiocb->aio_nbytes) {
- ret = 0;
- } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
- ret = -EINVAL;
- }
- break;
- case QEMU_AIO_WRITE:
- ret = handle_aiocb_rw(aiocb);
- if (ret == aiocb->aio_nbytes) {
- ret = 0;
- } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
- ret = -EINVAL;
- }
- break;
- case QEMU_AIO_FLUSH:
- ret = handle_aiocb_flush(aiocb);
- break;
- case QEMU_AIO_IOCTL:
- ret = handle_aiocb_ioctl(aiocb);
- break;
- default:
- fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
- ret = -EINVAL;
- break;
- }
-
- qemu_aio_release(aiocb);
- return ret;
-}
-
-static AIOPool raw_aio_pool = {
- .aiocb_size = sizeof(struct qemu_paiocb),
-};
-
-BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque, int type)
-{
- struct qemu_paiocb *acb;
-
- acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque);
- acb->aio_type = type;
- acb->aio_fildes = fd;
-
- if (qiov) {
- acb->aio_iov = qiov->iov;
- acb->aio_niov = qiov->niov;
- }
- acb->aio_nbytes = nb_sectors * 512;
- acb->aio_offset = sector_num * 512;
-
- trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
- return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
-}
-
-BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
- unsigned long int req, void *buf,
- BlockDriverCompletionFunc *cb, void *opaque)
-{
- struct qemu_paiocb *acb;
-
- acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque);
- acb->aio_type = QEMU_AIO_IOCTL;
- acb->aio_fildes = fd;
- acb->aio_offset = 0;
- acb->aio_ioctl_buf = buf;
- acb->aio_ioctl_cmd = req;
-
- return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
-}
projects / sdk / emulator / qemu.git / commitdiff