X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Fmmap.c;h=5b55a811511d594cc5f84c86e828da7a6157c800;hp=dc1fd33a2927fc8163140875ee12dbd0e6f22684;hb=12d9d841526ad75a67bb43a90edeefd05f85f11e;hpb=cec6b55da1c282b5b91ad346c7804171fccf151e

diff --git a/engines/mmap.c b/engines/mmap.c
index dc1fd33a..5b55a811 100644
--- a/engines/mmap.c
+++ b/engines/mmap.c
@@ -1,103 +1,137 @@
 /*
- * regular read/write sync io engine
+ * mmap engine
+ *
+ * IO engine that reads/writes from files by doing memcpy to/from
+ * a memory mapped region of the file.
  *
  */
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
-#include <assert.h>
 #include <sys/mman.h>
 
 #include "../fio.h"
-#include "../os.h"
-
-struct mmapio_data {
-	struct io_u *last_io_u;
-};
-
-static int fio_mmapio_getevents(struct thread_data *td, int fio_unused min,
-				int max, struct timespec fio_unused *t)
-{
-	assert(max <= 1);
-
-	/*
-	 * we can only have one finished io_u for sync io, since the depth
-	 * is always 1
-	 */
-	if (list_empty(&td->io_u_busylist))
-		return 0;
-
-	return 1;
-}
-
-static struct io_u *fio_mmapio_event(struct thread_data *td, int event)
-{
-	struct mmapio_data *sd = td->io_ops->data;
-
-	assert(event == 0);
-
-	return sd->last_io_u;
-}
-
 
 static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
 {
 	struct fio_file *f = io_u->file;
 	unsigned long long real_off = io_u->offset - f->file_offset;
-	struct mmapio_data *sd = td->io_ops->data;
+
+	fio_ro_check(td, io_u);
 
 	if (io_u->ddir == DDIR_READ)
 		memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen);
 	else if (io_u->ddir == DDIR_WRITE)
 		memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen);
 	else if (io_u->ddir == DDIR_SYNC) {
-		if (msync(f->mmap, f->file_size, MS_SYNC))
+		size_t len = (f->io_size + page_size - 1) & ~page_mask;
+
+		if (msync(f->mmap, len, MS_SYNC)) {
 			io_u->error = errno;
+			td_verror(td, io_u->error, "msync");
+		}
 	}
 
 	/*
 	 * not really direct, but should drop the pages from the cache
 	 */
-	if (td->odirect && io_u->ddir != DDIR_SYNC) {
-		if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0)
+	if (td->o.odirect && io_u->ddir != DDIR_SYNC) {
+		size_t len = (io_u->xfer_buflen + page_size - 1) & ~page_mask;
+		unsigned long long off = real_off & ~page_mask;
+
+		if (msync(f->mmap + off, len, MS_SYNC) < 0) {
 			io_u->error = errno;
-		if (madvise(f->mmap + real_off, io_u->xfer_buflen,  MADV_DONTNEED) < 0)
+			td_verror(td, io_u->error, "msync");
+		}
+		if (madvise(f->mmap + off, len,  MADV_DONTNEED) < 0) {
 			io_u->error = errno;
+			td_verror(td, io_u->error, "madvise");
+		}
 	}
 
-	if (!io_u->error)
-		sd->last_io_u = io_u;
-
-	return io_u->error;
+	return FIO_Q_COMPLETED;
 }
 
-static void fio_mmapio_cleanup(struct thread_data *td)
+static int fio_mmapio_open(struct thread_data *td, struct fio_file *f)
 {
-	if (td->io_ops->data) {
-		free(td->io_ops->data);
-		td->io_ops->data = NULL;
+	int ret, flags;
+
+	ret = generic_open_file(td, f);
+	if (ret)
+		return ret;
+
+	/*
+	 * for size checkup, don't mmap anything.
+	 */
+	if (!f->io_size)
+		return 0;
+
+	if (td_rw(td))
+		flags = PROT_READ | PROT_WRITE;
+	else if (td_write(td)) {
+		flags = PROT_WRITE;
+
+		if (td->o.verify != VERIFY_NONE)
+			flags |= PROT_READ;
+	} else
+		flags = PROT_READ;
+
+	f->mmap = mmap(NULL, f->io_size, flags, MAP_SHARED, f->fd, f->file_offset);
+	if (f->mmap == MAP_FAILED) {
+		f->mmap = NULL;
+		td_verror(td, errno, "mmap");
+		goto err;
+	}
+
+	if (file_invalidate_cache(td, f))
+		goto err;
+
+	if (!td_random(td)) {
+		if (madvise(f->mmap, f->io_size, MADV_SEQUENTIAL) < 0) {
+			td_verror(td, errno, "madvise");
+			goto err;
+		}
+	} else {
+		if (madvise(f->mmap, f->io_size, MADV_RANDOM) < 0) {
+			td_verror(td, errno, "madvise");
+			goto err;
+		}
 	}
+
+	return 0;
+
+err:
+	td->io_ops->close_file(td, f);
+	return 1;
 }
 
-static int fio_mmapio_init(struct thread_data *td)
+static int fio_mmapio_close(struct thread_data fio_unused *td,
+			    struct fio_file *f)
 {
-	struct mmapio_data *sd = malloc(sizeof(*sd));
+	int ret = 0, ret2;
 
-	sd->last_io_u = NULL;
-	td->io_ops->data = sd;
-	return 0;
+	if (f->mmap) {
+		if (munmap(f->mmap, f->io_size) < 0)
+			ret = errno;
+
+		f->mmap = NULL;
+	}
+
+	ret2 = generic_close_file(td, f);
+	if (!ret && ret2)
+		ret = ret2;
+
+	return ret;
 }
 
 static struct ioengine_ops ioengine = {
 	.name		= "mmap",
 	.version	= FIO_IOOPS_VERSION,
-	.init		= fio_mmapio_init,
 	.queue		= fio_mmapio_queue,
-	.getevents	= fio_mmapio_getevents,
-	.event		= fio_mmapio_event,
-	.cleanup	= fio_mmapio_cleanup,
-	.flags		= FIO_SYNCIO | FIO_MMAPIO,
+	.open_file	= fio_mmapio_open,
+	.close_file	= fio_mmapio_close,
+	.flags		= FIO_SYNCIO | FIO_NOEXTEND,
 };
 
 static void fio_init fio_mmapio_register(void)