diff options
Diffstat (limited to 'util')
-rw-r--r-- | util/cutils.c | 38 | ||||
-rw-r--r-- | util/oslib-posix.c | 18 | ||||
-rw-r--r-- | util/oslib-win32.c | 10 |
3 files changed, 28 insertions, 38 deletions
diff --git a/util/cutils.c b/util/cutils.c index a01a3a7..c0775bb 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -160,44 +160,6 @@ int qemu_fdatasync(int fd) #endif } -/** - * Sync changes made to the memory mapped file back to the backing - * storage. For POSIX compliant systems this will fallback - * to regular msync call. Otherwise it will trigger whole file sync - * (including the metadata case there is no support to skip that otherwise) - * - * @addr - start of the memory area to be synced - * @length - length of the are to be synced - * @fd - file descriptor for the file to be synced - * (mandatory only for POSIX non-compliant systems) - */ -int qemu_msync(void *addr, size_t length, int fd) -{ -#ifdef CONFIG_POSIX - size_t align_mask = ~(qemu_real_host_page_size() - 1); - - /** - * There are no strict reqs as per the length of mapping - * to be synced. Still the length needs to follow the address - * alignment changes. Additionally - round the size to the multiple - * of PAGE_SIZE - */ - length += ((uintptr_t)addr & (qemu_real_host_page_size() - 1)); - length = (length + ~align_mask) & align_mask; - - addr = (void *)((uintptr_t)addr & align_mask); - - return msync(addr, length, MS_SYNC); -#else /* CONFIG_POSIX */ - /** - * Perform the sync based on the file descriptor - * The sync range will most probably be wider than the one - * requested - but it will still get the job done - */ - return qemu_fdatasync(fd); -#endif /* CONFIG_POSIX */ -} - static int64_t suffix_mul(char suffix, int64_t unit) { switch (qemu_toupper(suffix)) { diff --git a/util/oslib-posix.c b/util/oslib-posix.c index c471c5b..161f112 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -950,3 +950,21 @@ int fcntl_setfl(int fd, int flag) } return 0; } + +int qemu_msync(void *addr, size_t length, int fd) +{ + size_t align_mask = ~(qemu_real_host_page_size() - 1); + + /** + * There are no strict reqs as per the length of mapping + * to be synced. Still the length needs to follow the address + * alignment changes. Additionally - round the size to the multiple + * of PAGE_SIZE + */ + length += ((uintptr_t)addr & (qemu_real_host_page_size() - 1)); + length = (length + ~align_mask) & align_mask; + + addr = (void *)((uintptr_t)addr & align_mask); + + return msync(addr, length, MS_SYNC); +} diff --git a/util/oslib-win32.c b/util/oslib-win32.c index f38b069..1e05c31 100644 --- a/util/oslib-win32.c +++ b/util/oslib-win32.c @@ -596,3 +596,13 @@ size_t qemu_get_host_physmem(void) } return 0; } + +int qemu_msync(void *addr, size_t length, int fd) +{ + /** + * Perform the sync based on the file descriptor + * The sync range will most probably be wider than the one + * requested - but it will still get the job done + */ + return qemu_fdatasync(fd); +} |