X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Fmmap.c;h=c479ed39497ef8c3bd8c70e380cdd6e3f18c8be1;hp=bb4a81a5a54f8eb2c3a047f866b624deea39cc7a;hb=487197d9e8f3aa0f135a6d88e5f222a1a930723a;hpb=0263882a95b9213d3afe285ae8adb5d0310d5039

diff --git a/engines/mmap.c b/engines/mmap.c
index bb4a81a5..c479ed39 100644
--- a/engines/mmap.c
+++ b/engines/mmap.c
@@ -1,110 +1,263 @@
 /*
- * 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"
-
-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;
+#include "../verify.h"
 
-	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))
-			io_u->error = errno;
-	}
-
-	/*
-	 * 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)
-			io_u->error = errno;
-		if (madvise(f->mmap + real_off, io_u->xfer_buflen,  MADV_DONTNEED) < 0)
-			io_u->error = errno;
-	}
+/*
+ * Limits us to 1GB of mapped files in total
+ */
+#define MMAP_TOTAL_SZ	(1 * 1024 * 1024 * 1024UL)
 
-	if (io_u->error)
-		td_verror(td, io_u->error, "sync");
+static unsigned long mmap_map_size;
 
-	return FIO_Q_COMPLETED;
-}
+struct fio_mmap_data {
+	void *mmap_ptr;
+	size_t mmap_sz;
+	off_t mmap_off;
+};
 
-static int fio_mmapio_open(struct thread_data *td, struct fio_file *f)
+static int fio_mmap_file(struct thread_data *td, struct fio_file *f,
+			 size_t length, off_t off)
 {
-	int ret, flags;
-
-	ret = generic_open_file(td, f);
-	if (ret)
-		return ret;
+	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
+	int flags = 0;
 
 	if (td_rw(td))
 		flags = PROT_READ | PROT_WRITE;
 	else if (td_write(td)) {
 		flags = PROT_WRITE;
 
-		if (td->verify != VERIFY_NONE)
+		if (td->o.verify != VERIFY_NONE)
 			flags |= PROT_READ;
 	} else
 		flags = PROT_READ;
 
-	f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset);
-	if (f->mmap == MAP_FAILED) {
-		f->mmap = NULL;
+	fmd->mmap_ptr = mmap(NULL, length, flags, MAP_SHARED, f->fd, off);
+	if (fmd->mmap_ptr == MAP_FAILED) {
+		fmd->mmap_ptr = 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->file_size, MADV_SEQUENTIAL) < 0) {
+		if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_SEQUENTIAL) < 0) {
 			td_verror(td, errno, "madvise");
 			goto err;
 		}
 	} else {
-		if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
+		if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_RANDOM) < 0) {
 			td_verror(td, errno, "madvise");
 			goto err;
 		}
 	}
+	if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_DONTNEED) < 0) {
+		td_verror(td, errno, "madvise");
+		goto err;
+	}
 
-	return 0;
+#ifdef FIO_MADV_FREE
+	if (f->filetype == FIO_TYPE_BD)
+		(void) posix_madvise(fmd->mmap_ptr, fmd->mmap_sz, FIO_MADV_FREE);
+#endif
 
 err:
-	td->io_ops->close_file(td, f);
-	return 1;
+	if (td->error && fmd->mmap_ptr)
+		munmap(fmd->mmap_ptr, length);
+
+	return td->error;
+}
+
+/*
+ * Just mmap an appropriate portion, we cannot mmap the full extent
+ */
+static int fio_mmapio_prep_limited(struct thread_data *td, struct io_u *io_u)
+{
+	struct fio_file *f = io_u->file;
+	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
+
+	if (io_u->buflen > mmap_map_size) {
+		log_err("fio: bs too big for mmap engine\n");
+		return EIO;
+	}
+
+	fmd->mmap_sz = mmap_map_size;
+	if (fmd->mmap_sz  > f->io_size)
+		fmd->mmap_sz = f->io_size;
+
+	fmd->mmap_off = io_u->offset;
+
+	return fio_mmap_file(td, f, fmd->mmap_sz, fmd->mmap_off);
 }
 
-static void fio_mmapio_close(struct thread_data fio_unused *td,
-			     struct fio_file *f)
+/*
+ * Attempt to mmap the entire file
+ */
+static int fio_mmapio_prep_full(struct thread_data *td, struct io_u *io_u)
 {
-	if (f->mmap) {
-		munmap(f->mmap, f->file_size);
-		f->mmap = NULL;
+	struct fio_file *f = io_u->file;
+	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
+	int ret;
+
+	if (fio_file_partial_mmap(f))
+		return EINVAL;
+	if (io_u->offset != (size_t) io_u->offset ||
+	    f->io_size != (size_t) f->io_size) {
+		fio_file_set_partial_mmap(f);
+		return EINVAL;
 	}
-	generic_close_file(td, f);
+
+	fmd->mmap_sz = f->io_size;
+	fmd->mmap_off = 0;
+
+	ret = fio_mmap_file(td, f, fmd->mmap_sz, fmd->mmap_off);
+	if (ret)
+		fio_file_set_partial_mmap(f);
+
+	return ret;
+}
+
+static int fio_mmapio_prep(struct thread_data *td, struct io_u *io_u)
+{
+	struct fio_file *f = io_u->file;
+	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
+	int ret;
+
+	/*
+	 * It fits within existing mapping, use it
+	 */
+	if (io_u->offset >= fmd->mmap_off &&
+	    io_u->offset + io_u->buflen < fmd->mmap_off + fmd->mmap_sz)
+		goto done;
+
+	/*
+	 * unmap any existing mapping
+	 */
+	if (fmd->mmap_ptr) {
+		if (munmap(fmd->mmap_ptr, fmd->mmap_sz) < 0)
+			return errno;
+		fmd->mmap_ptr = NULL;
+	}
+
+	if (fio_mmapio_prep_full(td, io_u)) {
+		td_clear_error(td);
+		ret = fio_mmapio_prep_limited(td, io_u);
+		if (ret)
+			return ret;
+	}
+
+done:
+	io_u->mmap_data = fmd->mmap_ptr + io_u->offset - fmd->mmap_off -
+				f->file_offset;
+	return 0;
+}
+
+static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
+{
+	struct fio_file *f = io_u->file;
+	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
+
+	fio_ro_check(td, io_u);
+
+	if (io_u->ddir == DDIR_READ)
+		memcpy(io_u->xfer_buf, io_u->mmap_data, io_u->xfer_buflen);
+	else if (io_u->ddir == DDIR_WRITE)
+		memcpy(io_u->mmap_data, io_u->xfer_buf, io_u->xfer_buflen);
+	else if (ddir_sync(io_u->ddir)) {
+		if (msync(fmd->mmap_ptr, fmd->mmap_sz, MS_SYNC)) {
+			io_u->error = errno;
+			td_verror(td, io_u->error, "msync");
+		}
+	} else if (io_u->ddir == DDIR_TRIM) {
+		int ret = do_io_u_trim(td, io_u);
+
+		if (!ret)
+			td_verror(td, io_u->error, "trim");
+	}
+
+
+	/*
+	 * not really direct, but should drop the pages from the cache
+	 */
+	if (td->o.odirect && ddir_rw(io_u->ddir)) {
+		if (msync(io_u->mmap_data, io_u->xfer_buflen, MS_SYNC) < 0) {
+			io_u->error = errno;
+			td_verror(td, io_u->error, "msync");
+		}
+		if (posix_madvise(io_u->mmap_data, io_u->xfer_buflen, POSIX_MADV_DONTNEED) < 0) {
+			io_u->error = errno;
+			td_verror(td, io_u->error, "madvise");
+		}
+	}
+
+	return FIO_Q_COMPLETED;
+}
+
+static int fio_mmapio_init(struct thread_data *td)
+{
+	struct thread_options *o = &td->o;
+
+	if ((o->rw_min_bs & page_mask) &&
+	    (o->odirect || o->fsync_blocks || o->fdatasync_blocks)) {
+		log_err("fio: mmap options dictate a minimum block size of "
+			"%llu bytes\n", (unsigned long long) page_size);
+		return 1;
+	}
+
+	mmap_map_size = MMAP_TOTAL_SZ / o->nr_files;
+	return 0;
+}
+
+static int fio_mmapio_open_file(struct thread_data *td, struct fio_file *f)
+{
+	struct fio_mmap_data *fmd;
+	int ret;
+
+	ret = generic_open_file(td, f);
+	if (ret)
+		return ret;
+
+	fmd = calloc(1, sizeof(*fmd));
+	if (!fmd) {
+		int fio_unused __ret;
+		__ret = generic_close_file(td, f);
+		return 1;
+	}
+
+	FILE_SET_ENG_DATA(f, fmd);
+	return 0;
+}
+
+static int fio_mmapio_close_file(struct thread_data *td, struct fio_file *f)
+{
+	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
+
+	FILE_SET_ENG_DATA(f, NULL);
+	free(fmd);
+	fio_file_clear_partial_mmap(f);
+
+	return generic_close_file(td, f);
 }
 
 static struct ioengine_ops ioengine = {
 	.name		= "mmap",
 	.version	= FIO_IOOPS_VERSION,
+	.init		= fio_mmapio_init,
+	.prep		= fio_mmapio_prep,
 	.queue		= fio_mmapio_queue,
-	.open_file	= fio_mmapio_open,
-	.close_file	= fio_mmapio_close,
+	.open_file	= fio_mmapio_open_file,
+	.close_file	= fio_mmapio_close_file,
+	.get_file_size	= generic_get_file_size,
 	.flags		= FIO_SYNCIO | FIO_NOEXTEND,
 };