6f1953c4c1
If we are flushing the caches for our image files we only care about the data (including the metadata required for accessing it) but not things like timestamp updates. So try to use fdatasync instead of fsync to implement the flush operations. Unfortunately many operating systems still do not support fdatasync, so we add a qemu_fdatasync wrapper that uses fdatasync if available as per the _POSIX_SYNCHRONIZED_IO feature macro or fsync otherwise. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
241 lines
6.7 KiB
C
241 lines
6.7 KiB
C
/* Common header file that is included by all of qemu. */
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#ifndef QEMU_COMMON_H
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#define QEMU_COMMON_H
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#define QEMU_NORETURN __attribute__ ((__noreturn__))
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/* Hack around the mess dyngen-exec.h causes: We need QEMU_NORETURN in files that
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cannot include the following headers without conflicts. This condition has
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to be removed once dyngen is gone. */
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#ifndef __DYNGEN_EXEC_H__
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/* we put basic includes here to avoid repeating them in device drivers */
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <strings.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <time.h>
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#include <ctype.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include "config-host.h"
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#endif
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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#ifndef ENOMEDIUM
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#define ENOMEDIUM ENODEV
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#endif
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#if !defined(ENOTSUP)
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#define ENOTSUP 4096
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#endif
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#ifndef CONFIG_IOVEC
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#define CONFIG_IOVEC
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struct iovec {
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void *iov_base;
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size_t iov_len;
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};
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#else
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#include <sys/uio.h>
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#endif
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#ifdef _WIN32
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#define fsync _commit
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#define lseek _lseeki64
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extern int qemu_ftruncate64(int, int64_t);
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#define ftruncate qemu_ftruncate64
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static inline char *realpath(const char *path, char *resolved_path)
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{
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_fullpath(resolved_path, path, _MAX_PATH);
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return resolved_path;
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}
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#define PRId64 "I64d"
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#define PRIx64 "I64x"
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#define PRIu64 "I64u"
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#define PRIo64 "I64o"
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#endif
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/* FIXME: Remove NEED_CPU_H. */
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#ifndef NEED_CPU_H
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#include <setjmp.h>
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#include "osdep.h"
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#include "bswap.h"
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#else
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#include "cpu.h"
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#endif /* !defined(NEED_CPU_H) */
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/* bottom halves */
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typedef struct QEMUBH QEMUBH;
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typedef void QEMUBHFunc(void *opaque);
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QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque);
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void qemu_bh_schedule(QEMUBH *bh);
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/* Bottom halfs that are scheduled from a bottom half handler are instantly
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* invoked. This can create an infinite loop if a bottom half handler
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* schedules itself. qemu_bh_schedule_idle() avoids this infinite loop by
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* ensuring that the bottom half isn't executed until the next main loop
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* iteration.
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*/
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void qemu_bh_schedule_idle(QEMUBH *bh);
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void qemu_bh_cancel(QEMUBH *bh);
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void qemu_bh_delete(QEMUBH *bh);
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int qemu_bh_poll(void);
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uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c);
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void qemu_get_timedate(struct tm *tm, int offset);
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int qemu_timedate_diff(struct tm *tm);
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/* cutils.c */
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void pstrcpy(char *buf, int buf_size, const char *str);
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char *pstrcat(char *buf, int buf_size, const char *s);
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int strstart(const char *str, const char *val, const char **ptr);
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int stristart(const char *str, const char *val, const char **ptr);
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int qemu_strnlen(const char *s, int max_len);
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time_t mktimegm(struct tm *tm);
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int qemu_fls(int i);
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int qemu_fdatasync(int fd);
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/* path.c */
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void init_paths(const char *prefix);
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const char *path(const char *pathname);
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#define qemu_isalnum(c) isalnum((unsigned char)(c))
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#define qemu_isalpha(c) isalpha((unsigned char)(c))
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#define qemu_iscntrl(c) iscntrl((unsigned char)(c))
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#define qemu_isdigit(c) isdigit((unsigned char)(c))
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#define qemu_isgraph(c) isgraph((unsigned char)(c))
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#define qemu_islower(c) islower((unsigned char)(c))
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#define qemu_isprint(c) isprint((unsigned char)(c))
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#define qemu_ispunct(c) ispunct((unsigned char)(c))
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#define qemu_isspace(c) isspace((unsigned char)(c))
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#define qemu_isupper(c) isupper((unsigned char)(c))
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#define qemu_isxdigit(c) isxdigit((unsigned char)(c))
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#define qemu_tolower(c) tolower((unsigned char)(c))
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#define qemu_toupper(c) toupper((unsigned char)(c))
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#define qemu_isascii(c) isascii((unsigned char)(c))
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#define qemu_toascii(c) toascii((unsigned char)(c))
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void *qemu_malloc(size_t size);
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void *qemu_realloc(void *ptr, size_t size);
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void *qemu_mallocz(size_t size);
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void qemu_free(void *ptr);
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char *qemu_strdup(const char *str);
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char *qemu_strndup(const char *str, size_t size);
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void *get_mmap_addr(unsigned long size);
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/* Error handling. */
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void QEMU_NORETURN hw_error(const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 1, 2)));
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/* IO callbacks. */
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typedef void IOReadHandler(void *opaque, const uint8_t *buf, int size);
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typedef int IOCanRWHandler(void *opaque);
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typedef void IOHandler(void *opaque);
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struct ParallelIOArg {
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void *buffer;
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int count;
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};
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typedef int (*DMA_transfer_handler) (void *opaque, int nchan, int pos, int size);
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/* A load of opaque types so that device init declarations don't have to
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pull in all the real definitions. */
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typedef struct NICInfo NICInfo;
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typedef struct HCIInfo HCIInfo;
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typedef struct AudioState AudioState;
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typedef struct BlockDriverState BlockDriverState;
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typedef struct DisplayState DisplayState;
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typedef struct DisplayChangeListener DisplayChangeListener;
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typedef struct DisplaySurface DisplaySurface;
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typedef struct DisplayAllocator DisplayAllocator;
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typedef struct PixelFormat PixelFormat;
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typedef struct TextConsole TextConsole;
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typedef TextConsole QEMUConsole;
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typedef struct CharDriverState CharDriverState;
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typedef struct VLANState VLANState;
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typedef struct QEMUFile QEMUFile;
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typedef struct i2c_bus i2c_bus;
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typedef struct i2c_slave i2c_slave;
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typedef struct SMBusDevice SMBusDevice;
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typedef struct QEMUTimer QEMUTimer;
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typedef struct PCIBus PCIBus;
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typedef struct PCIDevice PCIDevice;
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typedef struct SerialState SerialState;
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typedef struct IRQState *qemu_irq;
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typedef struct PCMCIACardState PCMCIACardState;
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typedef struct MouseTransformInfo MouseTransformInfo;
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typedef struct uWireSlave uWireSlave;
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typedef struct I2SCodec I2SCodec;
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typedef struct DeviceState DeviceState;
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typedef struct SSIBus SSIBus;
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/* CPU save/load. */
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void cpu_save(QEMUFile *f, void *opaque);
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int cpu_load(QEMUFile *f, void *opaque, int version_id);
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/* Force QEMU to stop what it's doing and service IO */
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void qemu_service_io(void);
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/* Force QEMU to process pending events */
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void qemu_notify_event(void);
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/* Unblock cpu */
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void qemu_cpu_kick(void *env);
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int qemu_cpu_self(void *env);
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#ifdef CONFIG_USER_ONLY
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#define qemu_init_vcpu(env) do { } while (0)
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#else
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void qemu_init_vcpu(void *env);
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#endif
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typedef struct QEMUIOVector {
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struct iovec *iov;
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int niov;
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int nalloc;
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size_t size;
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} QEMUIOVector;
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void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint);
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void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov);
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void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len);
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void qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t size);
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void qemu_iovec_destroy(QEMUIOVector *qiov);
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void qemu_iovec_reset(QEMUIOVector *qiov);
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void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf);
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void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count);
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struct Monitor;
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typedef struct Monitor Monitor;
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#include "module.h"
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#endif /* dyngen-exec.h hack */
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#endif
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