| /** |
| * libf2fs.c |
| * |
| * Copyright (c) 2013 Samsung Electronics Co., Ltd. |
| * http://www.samsung.com/ |
| * |
| * Dual licensed under the GPL or LGPL version 2 licenses. |
| */ |
| #define _LARGEFILE64_SOURCE |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <mntent.h> |
| #include <time.h> |
| #include <sys/stat.h> |
| #include <sys/mount.h> |
| #include <sys/ioctl.h> |
| #include <linux/hdreg.h> |
| |
| #include <f2fs_fs.h> |
| |
| struct f2fs_configuration c; |
| |
| static int __get_device_fd(__u64 *offset) |
| { |
| __u64 blk_addr = *offset >> F2FS_BLKSIZE_BITS; |
| int i; |
| |
| for (i = 0; i < c.ndevs; i++) { |
| if (c.devices[i].start_blkaddr <= blk_addr && |
| c.devices[i].end_blkaddr >= blk_addr) { |
| *offset -= |
| c.devices[i].start_blkaddr << F2FS_BLKSIZE_BITS; |
| return c.devices[i].fd; |
| } |
| } |
| return -1; |
| } |
| |
| /* |
| * IO interfaces |
| */ |
| int dev_read_version(void *buf, __u64 offset, size_t len) |
| { |
| if (lseek64(c.kd, (off64_t)offset, SEEK_SET) < 0) |
| return -1; |
| if (read(c.kd, buf, len) < 0) |
| return -1; |
| return 0; |
| } |
| |
| int dev_read(void *buf, __u64 offset, size_t len) |
| { |
| int fd = __get_device_fd(&offset); |
| |
| if (fd < 0) |
| return fd; |
| |
| if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0) |
| return -1; |
| if (read(fd, buf, len) < 0) |
| return -1; |
| return 0; |
| } |
| |
| int dev_readahead(__u64 offset, size_t len) |
| { |
| int fd = __get_device_fd(&offset); |
| |
| if (fd < 0) |
| return fd; |
| #ifdef POSIX_FADV_WILLNEED |
| return posix_fadvise(fd, offset, len, POSIX_FADV_WILLNEED); |
| #else |
| return 0; |
| #endif |
| } |
| |
| int dev_write(void *buf, __u64 offset, size_t len) |
| { |
| int fd = __get_device_fd(&offset); |
| |
| if (fd < 0) |
| return fd; |
| |
| if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0) |
| return -1; |
| if (write(fd, buf, len) < 0) |
| return -1; |
| return 0; |
| } |
| |
| int dev_write_block(void *buf, __u64 blk_addr) |
| { |
| return dev_write(buf, blk_addr << F2FS_BLKSIZE_BITS, F2FS_BLKSIZE); |
| } |
| |
| int dev_write_dump(void *buf, __u64 offset, size_t len) |
| { |
| if (lseek64(c.dump_fd, (off64_t)offset, SEEK_SET) < 0) |
| return -1; |
| if (write(c.dump_fd, buf, len) < 0) |
| return -1; |
| return 0; |
| } |
| |
| int dev_fill(void *buf, __u64 offset, size_t len) |
| { |
| int fd = __get_device_fd(&offset); |
| |
| if (fd < 0) |
| return fd; |
| |
| /* Only allow fill to zero */ |
| if (*((__u8*)buf)) |
| return -1; |
| if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0) |
| return -1; |
| if (write(fd, buf, len) < 0) |
| return -1; |
| return 0; |
| } |
| |
| int dev_fill_block(void *buf, __u64 blk_addr) |
| { |
| return dev_fill(buf, blk_addr << F2FS_BLKSIZE_BITS, F2FS_BLKSIZE); |
| } |
| |
| int dev_read_block(void *buf, __u64 blk_addr) |
| { |
| return dev_read(buf, blk_addr << F2FS_BLKSIZE_BITS, F2FS_BLKSIZE); |
| } |
| |
| int dev_reada_block(__u64 blk_addr) |
| { |
| return dev_readahead(blk_addr << F2FS_BLKSIZE_BITS, F2FS_BLKSIZE); |
| } |
| |
| void f2fs_finalize_device(void) |
| { |
| int i; |
| |
| /* |
| * We should call fsync() to flush out all the dirty pages |
| * in the block device page cache. |
| */ |
| for (i = 0; i < c.ndevs; i++) { |
| if (fsync(c.devices[i].fd) < 0) |
| MSG(0, "\tError: Could not conduct fsync!!!\n"); |
| |
| if (close(c.devices[i].fd) < 0) |
| MSG(0, "\tError: Failed to close device file!!!\n"); |
| } |
| close(c.kd); |
| } |