/*
- * 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;
+ 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;
- }
-
- if (io_u->error)
- td_verror(td, io_u->error, "sync");
-
- return FIO_Q_COMPLETED;
-}
-
-static int fio_mmapio_init(struct thread_data *td)
-{
- struct fio_file *f;
- int i;
-
- if (!td_write(td))
- return 0;
-
- /*
- * We need to truncate the files to the right size, if
- * we are writing to it.
- */
- for_each_file(td, f, i) {
- if (ftruncate(f->fd, f->file_size) < 0) {
- td_verror(td, errno, "ftruncate");
- return 1;
+ td_verror(td, io_u->error, "madvise");
}
}
- return 0;
+ return FIO_Q_COMPLETED;
}
static int fio_mmapio_open(struct thread_data *td, struct fio_file *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->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);
+ 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 (!td_random(td)) {
- if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) {
+ if (madvise(f->mmap, f->io_size, MADV_SEQUENTIAL) < 0) {
td_verror(td, errno, "madvise");
goto err;
}
} else {
- if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
+ if (madvise(f->mmap, f->io_size, MADV_RANDOM) < 0) {
td_verror(td, errno, "madvise");
goto err;
}
return 0;
err:
- if (f->mmap)
- munmap(f->mmap, f->file_size);
- generic_close_file(td, f);
+ td->io_ops->close_file(td, f);
return 1;
}
-static void fio_mmapio_close(struct thread_data fio_unused *td,
- struct fio_file *f)
+static int fio_mmapio_close(struct thread_data fio_unused *td,
+ struct fio_file *f)
{
+ int ret = 0, ret2;
+
if (f->mmap) {
- munmap(f->mmap, f->file_size);
+ 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,
.queue = fio_mmapio_queue,
- .init = fio_mmapio_init,
.open_file = fio_mmapio_open,
.close_file = fio_mmapio_close,
- .flags = FIO_SYNCIO,
+ .flags = FIO_SYNCIO | FIO_NOEXTEND,
};
static void fio_init fio_mmapio_register(void)