diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | linux-core/mmfs_drv.c | 43 | ||||
| -rw-r--r-- | tests/Makefile.am | 3 | ||||
| -rw-r--r-- | tests/mmfs_mmap.c | 129 |
4 files changed, 175 insertions, 1 deletions
@@ -59,6 +59,7 @@ tests/getstats tests/getversion tests/lock tests/mmfs_basic +tests/mmfs_mmap tests/mmfs_readwrite tests/openclose tests/setversion diff --git a/linux-core/mmfs_drv.c b/linux-core/mmfs_drv.c index d973592d..88246297 100644 --- a/linux-core/mmfs_drv.c +++ b/linux-core/mmfs_drv.c @@ -32,6 +32,8 @@ #include <linux/fs.h> #include <linux/file.h> #include <linux/module.h> +#include <linux/mman.h> +#include <linux/pagemap.h> #include "mmfs.h" /** @file mmfs.c @@ -245,6 +247,45 @@ mmfs_pread_ioctl(struct inode *inode, struct file *filp, } /** + * Maps the contents of an object, returning the address it is mapped + * into. + * + * While the mapping holds a reference on the contents of the object, it doesn't + * imply a ref on the object itself. + */ +static int +mmfs_mmap_ioctl(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + struct mmfs_file *mmfs_filp = filp->private_data; + struct mmfs_mmap_args args; + struct mmfs_object *obj; + loff_t offset; + + if (copy_from_user(&args, (void __user *)arg, sizeof(args))) + return -EFAULT; + + obj = mmfs_object_lookup(mmfs_filp, args.handle); + if (obj == NULL) + return -EINVAL; + + offset = args.offset; + + down_write(¤t->mm->mmap_sem); + args.addr = (void *)do_mmap(obj->filp, 0, args.size, + PROT_READ | PROT_WRITE, MAP_SHARED, + args.offset); + up_write(¤t->mm->mmap_sem); + + mmfs_object_unreference(obj); + + if (copy_to_user((void __user *)arg, &args, sizeof(args))) + return -EFAULT; + + return 0; +} + +/** * Writes data to the object referenced by handle. * * On error, the contents of the buffer that were to be modified are undefined. @@ -297,6 +338,8 @@ mmfs_ioctl(struct inode *inode, struct file *filp, return mmfs_pread_ioctl(inode, filp, cmd, arg); case MMFS_IOCTL_PWRITE: return mmfs_pwrite_ioctl(inode, filp, cmd, arg); + case MMFS_IOCTL_MMAP: + return mmfs_mmap_ioctl(inode, filp, cmd, arg); default: return -EINVAL; } diff --git a/tests/Makefile.am b/tests/Makefile.am index e2931013..67cb034d 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -24,7 +24,8 @@ TESTS = auth \ setversion \ updatedraw \ mmfs_basic \ - mmfs_readwrite + mmfs_readwrite \ + mmfs_mmap EXTRA_PROGRAMS = $(TESTS) CLEANFILES = $(EXTRA_PROGRAMS) $(EXTRA_LTLIBRARIES) diff --git a/tests/mmfs_mmap.c b/tests/mmfs_mmap.c new file mode 100644 index 00000000..3cb6a853 --- /dev/null +++ b/tests/mmfs_mmap.c @@ -0,0 +1,129 @@ +/* + * Copyright © 2008 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Eric Anholt <eric@anholt.net> + * + */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <assert.h> +#include <fcntl.h> +#include <inttypes.h> +#include <errno.h> +#include <sys/stat.h> +#include "mmfs.h" + +#define MMFS_BUFFER_SIZE 16384 + +int do_read(int fd, int handle, void *buf, int offset, int size) +{ + struct mmfs_pread_args read; + + /* Ensure that we don't have any convenient data in buf in case + * we fail. + */ + memset(buf, 0xd0, size); + + memset(&read, 0, sizeof(read)); + read.handle = handle; + read.data = buf; + read.size = size; + read.offset = offset; + + return ioctl(fd, MMFS_IOCTL_PREAD, &read); +} + +int do_write(int fd, int handle, void *buf, int offset, int size) +{ + struct mmfs_pwrite_args write; + + memset(&write, 0, sizeof(write)); + write.handle = handle; + write.data = buf; + write.size = size; + write.offset = offset; + + return ioctl(fd, MMFS_IOCTL_PWRITE, &write); +} + +int main(int argc, char **argv) +{ + int fd; + struct mmfs_alloc_args alloc; + struct mmfs_mmap_args mmap; + struct mmfs_unreference_args unref; + uint8_t expected[MMFS_BUFFER_SIZE]; + uint8_t buf[MMFS_BUFFER_SIZE]; + int ret; + int handle; + + fd = open_mmfs_device(); + + memset(&mmap, 0, sizeof(mmap)); + mmap.handle = 0x10101010; + mmap.offset = 0; + mmap.size = 4096; + printf("Testing mmaping of bad object.\n"); + ret = ioctl(fd, MMFS_IOCTL_MMAP, &mmap); + assert(ret == -1 && errno == EINVAL); + + memset(&alloc, 0, sizeof(alloc)); + alloc.size = MMFS_BUFFER_SIZE; + ret = ioctl(fd, MMFS_IOCTL_ALLOC, &alloc); + assert(ret == 0); + handle = alloc.handle; + + printf("Testing mmaping of newly allocated object.\n"); + mmap.handle = handle; + mmap.offset = 0; + mmap.size = MMFS_BUFFER_SIZE; + ret = ioctl(fd, MMFS_IOCTL_MMAP, &mmap); + assert(ret == 0); + + printf("Testing contents of newly allocated object.\n"); + memset(expected, 0, sizeof(expected)); + assert(memcmp(mmap.addr, expected, sizeof(expected)) == 0); + + printf("Testing coherency of writes and mmap reads.\n"); + memset(buf, 0, sizeof(buf)); + memset(buf + 1024, 0x01, 1024); + memset(expected + 1024, 0x01, 1024); + ret = do_write(fd, handle, buf, 0, MMFS_BUFFER_SIZE); + assert(ret == 0); + assert(memcmp(buf, mmap.addr, sizeof(buf)) == 0); + + printf("Testing that mapping stays after unreference\n"); + unref.handle = handle; + ret = ioctl(fd, MMFS_IOCTL_UNREFERENCE, &unref); + assert(ret == 0); + assert(memcmp(buf, mmap.addr, sizeof(buf)) == 0); + + printf("Testing unmapping\n"); + munmap(mmap.addr, MMFS_BUFFER_SIZE); + + close(fd); + + return 0; +} |