Retry bdev cache invalidation for EAGAIN errors

[fio.git] / filesetup.c

diff --git a/filesetup.c b/filesetup.c
index 881aeee8f8bf2b94649046181d9892d7050face8..e1dedcd8bdec6d074d37f2ea07d6bde45007f9e5 100644 (file)
--- a/filesetup.c
+++ b/filesetup.c
@@ -413,7 +413,19 @@ static int __file_invalidate_cache(struct thread_data *td, struct fio_file *f,
        else if (f->filetype == FIO_TYPE_FILE)
                ret = posix_fadvise(f->fd, off, len, POSIX_FADV_DONTNEED);
        else if (f->filetype == FIO_TYPE_BD) {
+               int retry_count = 0;
+
                ret = blockdev_invalidate_cache(f);
+               while (ret < 0 && errno == EAGAIN && retry_count++ < 25) {
+                       /*
+                        * Linux multipath devices reject ioctl while
+                        * the maps are being updated. That window can
+                        * last tens of milliseconds; we'll try up to
+                        * a quarter of a second.
+                        */
+                       usleep(10000);
+                       ret = blockdev_invalidate_cache(f);
+               }
                if (ret < 0 && errno == EACCES && geteuid()) {
                        if (!root_warn) {
                                log_err("fio: only root may flush block "