root / posix-aio-compat.c @ e3e87df4
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/*
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* QEMU posix-aio emulation
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include <sys/ioctl.h> |
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#include <sys/types.h> |
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#include <pthread.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <time.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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|
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#include "qemu-queue.h" |
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#include "osdep.h" |
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#include "sysemu.h" |
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#include "qemu-common.h" |
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#include "trace.h" |
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#include "block_int.h" |
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#include "iov.h" |
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#include "block/raw-posix-aio.h" |
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static void do_spawn_thread(void); |
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struct qemu_paiocb {
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BlockDriverAIOCB common; |
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int aio_fildes;
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union {
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struct iovec *aio_iov;
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void *aio_ioctl_buf;
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}; |
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int aio_niov;
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size_t aio_nbytes; |
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#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */ |
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off_t aio_offset; |
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QTAILQ_ENTRY(qemu_paiocb) node; |
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int aio_type;
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ssize_t ret; |
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int active;
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struct qemu_paiocb *next;
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}; |
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typedef struct PosixAioState { |
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int rfd, wfd;
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struct qemu_paiocb *first_aio;
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} PosixAioState; |
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static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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static pthread_t thread_id;
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static pthread_attr_t attr;
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static int max_threads = 64; |
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static int cur_threads = 0; |
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static int idle_threads = 0; |
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static int new_threads = 0; /* backlog of threads we need to create */ |
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static int pending_threads = 0; /* threads created but not running yet */ |
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static QEMUBH *new_thread_bh;
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static QTAILQ_HEAD(, qemu_paiocb) request_list;
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#ifdef CONFIG_PREADV
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static int preadv_present = 1; |
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#else
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static int preadv_present = 0; |
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#endif
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static void die2(int err, const char *what) |
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{ |
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fprintf(stderr, "%s failed: %s\n", what, strerror(err));
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abort(); |
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} |
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static void die(const char *what) |
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{ |
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die2(errno, what); |
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} |
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static void mutex_lock(pthread_mutex_t *mutex) |
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{ |
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int ret = pthread_mutex_lock(mutex);
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if (ret) die2(ret, "pthread_mutex_lock"); |
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} |
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static void mutex_unlock(pthread_mutex_t *mutex) |
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{ |
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int ret = pthread_mutex_unlock(mutex);
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if (ret) die2(ret, "pthread_mutex_unlock"); |
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} |
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static int cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, |
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struct timespec *ts)
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{ |
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int ret = pthread_cond_timedwait(cond, mutex, ts);
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if (ret && ret != ETIMEDOUT) die2(ret, "pthread_cond_timedwait"); |
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return ret;
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} |
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static void cond_signal(pthread_cond_t *cond) |
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{ |
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int ret = pthread_cond_signal(cond);
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if (ret) die2(ret, "pthread_cond_signal"); |
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} |
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static void thread_create(pthread_t *thread, pthread_attr_t *attr, |
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void *(*start_routine)(void*), void *arg) |
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{ |
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int ret = pthread_create(thread, attr, start_routine, arg);
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if (ret) die2(ret, "pthread_create"); |
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} |
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static ssize_t handle_aiocb_ioctl(struct qemu_paiocb *aiocb) |
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{ |
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int ret;
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ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf); |
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if (ret == -1) |
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return -errno;
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/*
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* This looks weird, but the aio code only considers a request
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* successful if it has written the full number of bytes.
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*
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* Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
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* so in fact we return the ioctl command here to make posix_aio_read()
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* happy..
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*/
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return aiocb->aio_nbytes;
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} |
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static ssize_t handle_aiocb_flush(struct qemu_paiocb *aiocb) |
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{ |
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int ret;
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ret = qemu_fdatasync(aiocb->aio_fildes); |
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if (ret == -1) |
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return -errno;
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return 0; |
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} |
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#ifdef CONFIG_PREADV
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static ssize_t
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qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
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{ |
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return preadv(fd, iov, nr_iov, offset);
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} |
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static ssize_t
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qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
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{ |
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return pwritev(fd, iov, nr_iov, offset);
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} |
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#else
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static ssize_t
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qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
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{ |
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return -ENOSYS;
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} |
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static ssize_t
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qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
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{ |
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return -ENOSYS;
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} |
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#endif
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static ssize_t handle_aiocb_rw_vector(struct qemu_paiocb *aiocb) |
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{ |
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ssize_t len; |
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do {
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if (aiocb->aio_type & QEMU_AIO_WRITE)
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len = qemu_pwritev(aiocb->aio_fildes, |
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aiocb->aio_iov, |
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aiocb->aio_niov, |
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aiocb->aio_offset); |
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else
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len = qemu_preadv(aiocb->aio_fildes, |
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aiocb->aio_iov, |
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aiocb->aio_niov, |
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aiocb->aio_offset); |
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} while (len == -1 && errno == EINTR); |
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if (len == -1) |
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return -errno;
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return len;
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} |
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/*
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* Read/writes the data to/from a given linear buffer.
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*
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* Returns the number of bytes handles or -errno in case of an error. Short
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* reads are only returned if the end of the file is reached.
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*/
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static ssize_t handle_aiocb_rw_linear(struct qemu_paiocb *aiocb, char *buf) |
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{ |
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ssize_t offset = 0;
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ssize_t len; |
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while (offset < aiocb->aio_nbytes) {
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if (aiocb->aio_type & QEMU_AIO_WRITE)
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len = pwrite(aiocb->aio_fildes, |
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(const char *)buf + offset, |
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aiocb->aio_nbytes - offset, |
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aiocb->aio_offset + offset); |
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else
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len = pread(aiocb->aio_fildes, |
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buf + offset, |
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aiocb->aio_nbytes - offset, |
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aiocb->aio_offset + offset); |
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if (len == -1 && errno == EINTR) |
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continue;
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else if (len == -1) { |
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offset = -errno; |
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break;
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} else if (len == 0) |
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break;
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offset += len; |
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} |
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return offset;
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} |
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static ssize_t handle_aiocb_rw(struct qemu_paiocb *aiocb) |
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{ |
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ssize_t nbytes; |
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char *buf;
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if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
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/*
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* If there is just a single buffer, and it is properly aligned
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* we can just use plain pread/pwrite without any problems.
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*/
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if (aiocb->aio_niov == 1) |
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return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
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/*
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* We have more than one iovec, and all are properly aligned.
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*
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* Try preadv/pwritev first and fall back to linearizing the
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* buffer if it's not supported.
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*/
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if (preadv_present) {
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nbytes = handle_aiocb_rw_vector(aiocb); |
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if (nbytes == aiocb->aio_nbytes)
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return nbytes;
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if (nbytes < 0 && nbytes != -ENOSYS) |
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return nbytes;
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preadv_present = 0;
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} |
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/*
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* XXX(hch): short read/write. no easy way to handle the reminder
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* using these interfaces. For now retry using plain
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* pread/pwrite?
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*/
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} |
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/*
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* Ok, we have to do it the hard way, copy all segments into
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* a single aligned buffer.
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*/
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buf = qemu_blockalign(aiocb->common.bs, aiocb->aio_nbytes); |
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if (aiocb->aio_type & QEMU_AIO_WRITE) {
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char *p = buf;
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int i;
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for (i = 0; i < aiocb->aio_niov; ++i) { |
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memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len); |
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p += aiocb->aio_iov[i].iov_len; |
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} |
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} |
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nbytes = handle_aiocb_rw_linear(aiocb, buf); |
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if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
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char *p = buf;
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size_t count = aiocb->aio_nbytes, copy; |
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int i;
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for (i = 0; i < aiocb->aio_niov && count; ++i) { |
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copy = count; |
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if (copy > aiocb->aio_iov[i].iov_len)
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copy = aiocb->aio_iov[i].iov_len; |
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memcpy(aiocb->aio_iov[i].iov_base, p, copy); |
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p += copy; |
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count -= copy; |
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} |
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} |
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qemu_vfree(buf); |
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return nbytes;
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} |
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static void posix_aio_notify_event(void); |
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static void *aio_thread(void *unused) |
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{ |
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mutex_lock(&lock); |
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pending_threads--; |
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mutex_unlock(&lock); |
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do_spawn_thread(); |
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while (1) { |
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struct qemu_paiocb *aiocb;
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ssize_t ret = 0;
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qemu_timeval tv; |
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struct timespec ts;
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qemu_gettimeofday(&tv); |
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ts.tv_sec = tv.tv_sec + 10;
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ts.tv_nsec = 0;
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mutex_lock(&lock); |
333 |
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while (QTAILQ_EMPTY(&request_list) &&
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!(ret == ETIMEDOUT)) { |
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idle_threads++; |
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ret = cond_timedwait(&cond, &lock, &ts); |
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idle_threads--; |
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} |
340 |
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if (QTAILQ_EMPTY(&request_list))
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break;
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aiocb = QTAILQ_FIRST(&request_list); |
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QTAILQ_REMOVE(&request_list, aiocb, node); |
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aiocb->active = 1;
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mutex_unlock(&lock); |
348 |
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switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
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case QEMU_AIO_READ:
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ret = handle_aiocb_rw(aiocb); |
352 |
if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->common.bs->growable) { |
353 |
/* A short read means that we have reached EOF. Pad the buffer
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* with zeros for bytes after EOF. */
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iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret, |
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0, aiocb->aio_nbytes - ret);
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ret = aiocb->aio_nbytes; |
359 |
} |
360 |
break;
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case QEMU_AIO_WRITE:
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ret = handle_aiocb_rw(aiocb); |
363 |
break;
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case QEMU_AIO_FLUSH:
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ret = handle_aiocb_flush(aiocb); |
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break;
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case QEMU_AIO_IOCTL:
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ret = handle_aiocb_ioctl(aiocb); |
369 |
break;
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370 |
default:
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fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
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ret = -EINVAL; |
373 |
break;
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374 |
} |
375 |
|
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mutex_lock(&lock); |
377 |
aiocb->ret = ret; |
378 |
mutex_unlock(&lock); |
379 |
|
380 |
posix_aio_notify_event(); |
381 |
} |
382 |
|
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cur_threads--; |
384 |
mutex_unlock(&lock); |
385 |
|
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return NULL; |
387 |
} |
388 |
|
389 |
static void do_spawn_thread(void) |
390 |
{ |
391 |
sigset_t set, oldset; |
392 |
|
393 |
mutex_lock(&lock); |
394 |
if (!new_threads) {
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395 |
mutex_unlock(&lock); |
396 |
return;
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} |
398 |
|
399 |
new_threads--; |
400 |
pending_threads++; |
401 |
|
402 |
mutex_unlock(&lock); |
403 |
|
404 |
/* block all signals */
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405 |
if (sigfillset(&set)) die("sigfillset"); |
406 |
if (sigprocmask(SIG_SETMASK, &set, &oldset)) die("sigprocmask"); |
407 |
|
408 |
thread_create(&thread_id, &attr, aio_thread, NULL);
|
409 |
|
410 |
if (sigprocmask(SIG_SETMASK, &oldset, NULL)) die("sigprocmask restore"); |
411 |
} |
412 |
|
413 |
static void spawn_thread_bh_fn(void *opaque) |
414 |
{ |
415 |
do_spawn_thread(); |
416 |
} |
417 |
|
418 |
static void spawn_thread(void) |
419 |
{ |
420 |
cur_threads++; |
421 |
new_threads++; |
422 |
/* If there are threads being created, they will spawn new workers, so
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423 |
* we don't spend time creating many threads in a loop holding a mutex or
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424 |
* starving the current vcpu.
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425 |
*
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426 |
* If there are no idle threads, ask the main thread to create one, so we
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427 |
* inherit the correct affinity instead of the vcpu affinity.
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428 |
*/
|
429 |
if (!pending_threads) {
|
430 |
qemu_bh_schedule(new_thread_bh); |
431 |
} |
432 |
} |
433 |
|
434 |
static void qemu_paio_submit(struct qemu_paiocb *aiocb) |
435 |
{ |
436 |
aiocb->ret = -EINPROGRESS; |
437 |
aiocb->active = 0;
|
438 |
mutex_lock(&lock); |
439 |
if (idle_threads == 0 && cur_threads < max_threads) |
440 |
spawn_thread(); |
441 |
QTAILQ_INSERT_TAIL(&request_list, aiocb, node); |
442 |
mutex_unlock(&lock); |
443 |
cond_signal(&cond); |
444 |
} |
445 |
|
446 |
static ssize_t qemu_paio_return(struct qemu_paiocb *aiocb) |
447 |
{ |
448 |
ssize_t ret; |
449 |
|
450 |
mutex_lock(&lock); |
451 |
ret = aiocb->ret; |
452 |
mutex_unlock(&lock); |
453 |
|
454 |
return ret;
|
455 |
} |
456 |
|
457 |
static int qemu_paio_error(struct qemu_paiocb *aiocb) |
458 |
{ |
459 |
ssize_t ret = qemu_paio_return(aiocb); |
460 |
|
461 |
if (ret < 0) |
462 |
ret = -ret; |
463 |
else
|
464 |
ret = 0;
|
465 |
|
466 |
return ret;
|
467 |
} |
468 |
|
469 |
static void posix_aio_read(void *opaque) |
470 |
{ |
471 |
PosixAioState *s = opaque; |
472 |
struct qemu_paiocb *acb, **pacb;
|
473 |
int ret;
|
474 |
ssize_t len; |
475 |
|
476 |
/* read all bytes from signal pipe */
|
477 |
for (;;) {
|
478 |
char bytes[16]; |
479 |
|
480 |
len = read(s->rfd, bytes, sizeof(bytes));
|
481 |
if (len == -1 && errno == EINTR) |
482 |
continue; /* try again */ |
483 |
if (len == sizeof(bytes)) |
484 |
continue; /* more to read */ |
485 |
break;
|
486 |
} |
487 |
|
488 |
for(;;) {
|
489 |
pacb = &s->first_aio; |
490 |
for(;;) {
|
491 |
acb = *pacb; |
492 |
if (!acb)
|
493 |
return;
|
494 |
|
495 |
ret = qemu_paio_error(acb); |
496 |
if (ret == ECANCELED) {
|
497 |
/* remove the request */
|
498 |
*pacb = acb->next; |
499 |
qemu_aio_release(acb); |
500 |
} else if (ret != EINPROGRESS) { |
501 |
/* end of aio */
|
502 |
if (ret == 0) { |
503 |
ret = qemu_paio_return(acb); |
504 |
if (ret == acb->aio_nbytes)
|
505 |
ret = 0;
|
506 |
else
|
507 |
ret = -EINVAL; |
508 |
} else {
|
509 |
ret = -ret; |
510 |
} |
511 |
|
512 |
trace_paio_complete(acb, acb->common.opaque, ret); |
513 |
|
514 |
/* remove the request */
|
515 |
*pacb = acb->next; |
516 |
/* call the callback */
|
517 |
acb->common.cb(acb->common.opaque, ret); |
518 |
qemu_aio_release(acb); |
519 |
break;
|
520 |
} else {
|
521 |
pacb = &acb->next; |
522 |
} |
523 |
} |
524 |
} |
525 |
} |
526 |
|
527 |
static int posix_aio_flush(void *opaque) |
528 |
{ |
529 |
PosixAioState *s = opaque; |
530 |
return !!s->first_aio;
|
531 |
} |
532 |
|
533 |
static PosixAioState *posix_aio_state;
|
534 |
|
535 |
static void posix_aio_notify_event(void) |
536 |
{ |
537 |
char byte = 0; |
538 |
ssize_t ret; |
539 |
|
540 |
ret = write(posix_aio_state->wfd, &byte, sizeof(byte));
|
541 |
if (ret < 0 && errno != EAGAIN) |
542 |
die("write()");
|
543 |
} |
544 |
|
545 |
static void paio_remove(struct qemu_paiocb *acb) |
546 |
{ |
547 |
struct qemu_paiocb **pacb;
|
548 |
|
549 |
/* remove the callback from the queue */
|
550 |
pacb = &posix_aio_state->first_aio; |
551 |
for(;;) {
|
552 |
if (*pacb == NULL) { |
553 |
fprintf(stderr, "paio_remove: aio request not found!\n");
|
554 |
break;
|
555 |
} else if (*pacb == acb) { |
556 |
*pacb = acb->next; |
557 |
qemu_aio_release(acb); |
558 |
break;
|
559 |
} |
560 |
pacb = &(*pacb)->next; |
561 |
} |
562 |
} |
563 |
|
564 |
static void paio_cancel(BlockDriverAIOCB *blockacb) |
565 |
{ |
566 |
struct qemu_paiocb *acb = (struct qemu_paiocb *)blockacb; |
567 |
int active = 0; |
568 |
|
569 |
trace_paio_cancel(acb, acb->common.opaque); |
570 |
|
571 |
mutex_lock(&lock); |
572 |
if (!acb->active) {
|
573 |
QTAILQ_REMOVE(&request_list, acb, node); |
574 |
acb->ret = -ECANCELED; |
575 |
} else if (acb->ret == -EINPROGRESS) { |
576 |
active = 1;
|
577 |
} |
578 |
mutex_unlock(&lock); |
579 |
|
580 |
if (active) {
|
581 |
/* fail safe: if the aio could not be canceled, we wait for
|
582 |
it */
|
583 |
while (qemu_paio_error(acb) == EINPROGRESS)
|
584 |
; |
585 |
} |
586 |
|
587 |
paio_remove(acb); |
588 |
} |
589 |
|
590 |
static AIOPool raw_aio_pool = {
|
591 |
.aiocb_size = sizeof(struct qemu_paiocb), |
592 |
.cancel = paio_cancel, |
593 |
}; |
594 |
|
595 |
BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
|
596 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
597 |
BlockDriverCompletionFunc *cb, void *opaque, int type) |
598 |
{ |
599 |
struct qemu_paiocb *acb;
|
600 |
|
601 |
acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); |
602 |
acb->aio_type = type; |
603 |
acb->aio_fildes = fd; |
604 |
|
605 |
if (qiov) {
|
606 |
acb->aio_iov = qiov->iov; |
607 |
acb->aio_niov = qiov->niov; |
608 |
} |
609 |
acb->aio_nbytes = nb_sectors * 512;
|
610 |
acb->aio_offset = sector_num * 512;
|
611 |
|
612 |
acb->next = posix_aio_state->first_aio; |
613 |
posix_aio_state->first_aio = acb; |
614 |
|
615 |
trace_paio_submit(acb, opaque, sector_num, nb_sectors, type); |
616 |
qemu_paio_submit(acb); |
617 |
return &acb->common;
|
618 |
} |
619 |
|
620 |
BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
|
621 |
unsigned long int req, void *buf, |
622 |
BlockDriverCompletionFunc *cb, void *opaque)
|
623 |
{ |
624 |
struct qemu_paiocb *acb;
|
625 |
|
626 |
acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); |
627 |
acb->aio_type = QEMU_AIO_IOCTL; |
628 |
acb->aio_fildes = fd; |
629 |
acb->aio_offset = 0;
|
630 |
acb->aio_ioctl_buf = buf; |
631 |
acb->aio_ioctl_cmd = req; |
632 |
|
633 |
acb->next = posix_aio_state->first_aio; |
634 |
posix_aio_state->first_aio = acb; |
635 |
|
636 |
qemu_paio_submit(acb); |
637 |
return &acb->common;
|
638 |
} |
639 |
|
640 |
int paio_init(void) |
641 |
{ |
642 |
PosixAioState *s; |
643 |
int fds[2]; |
644 |
int ret;
|
645 |
|
646 |
if (posix_aio_state)
|
647 |
return 0; |
648 |
|
649 |
s = g_malloc(sizeof(PosixAioState));
|
650 |
|
651 |
s->first_aio = NULL;
|
652 |
if (qemu_pipe(fds) == -1) { |
653 |
fprintf(stderr, "failed to create pipe\n");
|
654 |
g_free(s); |
655 |
return -1; |
656 |
} |
657 |
|
658 |
s->rfd = fds[0];
|
659 |
s->wfd = fds[1];
|
660 |
|
661 |
fcntl(s->rfd, F_SETFL, O_NONBLOCK); |
662 |
fcntl(s->wfd, F_SETFL, O_NONBLOCK); |
663 |
|
664 |
qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush, s);
|
665 |
|
666 |
ret = pthread_attr_init(&attr); |
667 |
if (ret)
|
668 |
die2(ret, "pthread_attr_init");
|
669 |
|
670 |
ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
671 |
if (ret)
|
672 |
die2(ret, "pthread_attr_setdetachstate");
|
673 |
|
674 |
QTAILQ_INIT(&request_list); |
675 |
new_thread_bh = qemu_bh_new(spawn_thread_bh_fn, NULL);
|
676 |
|
677 |
posix_aio_state = s; |
678 |
return 0; |
679 |
} |