diff options
Diffstat (limited to 'hw/9pfs/virtio-9p-handle.c')
| -rw-r--r-- | hw/9pfs/virtio-9p-handle.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/hw/9pfs/virtio-9p-handle.c b/hw/9pfs/virtio-9p-handle.c index 5c8b5ed471..b248e44916 100644 --- a/hw/9pfs/virtio-9p-handle.c +++ b/hw/9pfs/virtio-9p-handle.c @@ -192,16 +192,29 @@ static ssize_t handle_preadv(FsContext *ctx, int fd, const struct iovec *iov, static ssize_t handle_pwritev(FsContext *ctx, int fd, const struct iovec *iov, int iovcnt, off_t offset) { + ssize_t ret; #ifdef CONFIG_PREADV - return pwritev(fd, iov, iovcnt, offset); + ret = pwritev(fd, iov, iovcnt, offset); #else int err = lseek(fd, offset, SEEK_SET); if (err == -1) { return err; } else { - return writev(fd, iov, iovcnt); + ret = writev(fd, iov, iovcnt); } #endif +#ifdef CONFIG_SYNC_FILE_RANGE + if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { + /* + * Initiate a writeback. This is not a data integrity sync. + * We want to ensure that we don't leave dirty pages in the cache + * after write when writeout=immediate is sepcified. + */ + sync_file_range(fd, offset, ret, + SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); + } +#endif + return ret; } static int handle_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |