375 lines
7.6 KiB
C
375 lines
7.6 KiB
C
#include "fs_rpc.h"
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#include "cons_cli.h"
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#include "cpiofs.h"
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#include "fs_svr.h"
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#include "rpc_prot.h"
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#include "u_env.h"
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#include "u_log.h"
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#include "u_rpc.h"
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#include "u_rpc_svr.h"
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#include "u_sys.h"
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "kstat.h"
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static fs_t fs;
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typedef struct file_desc
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{
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pid_t pid;
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addr_t file_addr;
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size_t file_size;
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ssize_t offset;
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int type;
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char open_name[32];
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} file_desc_t;
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#define FD_OFFSET_INX 4
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#define CPIO_FS_FD_NR 8
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static file_desc_t fds[CPIO_FS_FD_NR];
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static file_desc_t *fd_alloc(int pid, addr_t file_addr, size_t file_size, ssize_t offset, int *fd, int type)
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{
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for (int i = 0; i < CPIO_FS_FD_NR; i++)
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{
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if (fds[i].file_addr == 0)
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{
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fds[i].pid = pid;
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fds[i].file_addr = file_addr;
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fds[i].file_size = file_size;
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fds[i].offset = offset;
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fds[i].type = type;
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if (fd)
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{
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*fd = i + FD_OFFSET_INX;
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}
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return fds + i;
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}
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}
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return NULL;
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}
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static file_desc_t *fd_get(int pid, int fd)
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{
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fd -= FD_OFFSET_INX;
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if (fd < 0 || fd >= CPIO_FS_FD_NR)
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{
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return NULL;
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}
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if (fds[fd].file_addr == 0)
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{
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return NULL;
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}
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if (fds[fd].pid != pid)
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{
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return NULL;
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}
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return &fds[fd];
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}
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static void fd_free(int fd)
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{
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fd -= FD_OFFSET_INX;
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if (fd < 0 || fd >= CPIO_FS_FD_NR)
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{
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return;
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}
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if (fds[fd].file_addr)
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{
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if (fds[fd].pid == thread_get_src_pid())
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{
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fds[fd].file_addr = 0;
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fds[fd].pid = -1;
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}
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}
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}
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static sys_info_t sys_info;
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int fs_svr_open(const char *path, int flags, int mode)
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{
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int pid = thread_get_src_pid();
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msg_tag_t tag;
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char *o_path;
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// *((char *)0) = 0;
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if (flags & O_RDWR)
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{
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return -EACCES;
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}
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if (flags & O_WRONLY)
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{
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return -EACCES;
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}
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if (path[0] == '/')
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{
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path++;
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}
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#if FS_DEBUG
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printf("[cpiofs][%d] open %s.\n", pid, path);
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#endif
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umword_t size;
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int type;
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umword_t addr;
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int ret = cpio_find_file((umword_t)sys_info.bootfs_start_addr,
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(umword_t)(-1), path, &size, &type, &addr);
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if (ret < 0)
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{
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#if FS_DEBUG
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printf("[cpiofs] not find %s.\n", path);
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#endif
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return -ENOENT;
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}
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int fd;
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// 找到指定文件
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file_desc_t *fdp = fd_alloc(pid, addr, size, 0, &fd, type);
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if (!fdp)
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{
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#if FS_DEBUG
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printf("[cpiofs] not fd %s.\n", path);
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#endif
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return -ENOMEM;
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}
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strncpy(fdp->open_name, path, 32);
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fdp->open_name[32 - 1] = 0;
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#if FS_DEBUG
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printf("[cpiofs] open success %s, fd is %d.\n", path, fd);
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#endif
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return fd;
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}
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int fs_svr_read(int fd, void *buf, size_t len)
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{
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file_desc_t *fdp = fd_get(thread_get_src_pid(), fd);
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if (!fdp)
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{
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return -ENOENT;
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}
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if (fdp->type != 0)
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{
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return -EACCES;
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}
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size_t remain_size = fdp->file_size - fdp->offset;
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size_t read_size = 0;
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read_size = MIN(remain_size, len);
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if (read_size)
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{
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memcpy(buf, (void *)(fdp->file_addr + fdp->offset), read_size);
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fdp->offset += read_size;
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}
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return read_size;
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}
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int fs_svr_write(int fd, void *buf, size_t len)
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{
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file_desc_t *fdp = fd_get(thread_get_src_pid(), fd);
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if (!fdp)
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{
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return -ENOENT;
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}
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return -EACCES;
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}
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void fs_svr_close(int fd)
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{
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fd_free(fd);
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}
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int fs_svr_lseek(int fd, int offs, int whence)
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{
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file_desc_t *file = fd_get(thread_get_src_pid(), fd);
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int new_offs = 0;
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if (!file)
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{
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return -ENOENT;
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}
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if (file->type != 0)
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{
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return -EACCES;
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}
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switch (whence)
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{
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case SEEK_SET:
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new_offs = offs;
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break;
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case SEEK_END:
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{
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new_offs = file->file_size + offs;
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}
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break;
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case SEEK_CUR:
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{
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new_offs = offs + file->offset;
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}
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break;
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default:
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return -EINVAL;
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}
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if (new_offs > file->file_size)
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{
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new_offs = file->file_size;
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}
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if (new_offs < 0)
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{
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new_offs = 0;
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}
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file->offset = new_offs;
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return 0;
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}
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int fs_svr_ftruncate(int fd, off_t off)
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{
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return -ENOSYS;
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}
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void fs_svr_sync(int fd)
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{
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}
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int fs_svr_readdir(int fd, dirent_t *dir)
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{
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int pid = thread_get_src_pid();
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file_desc_t *file = fd_get(pid, fd);
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int new_offs = 0;
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#if FS_DEBUG
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printf("[cpiofs] readdir fd is %d.\n", fd);
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#endif
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if (!file)
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{
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return -ENOENT;
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}
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if (file->type != 1)
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{
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return -EACCES;
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}
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umword_t size;
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int type;
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umword_t next_addr;
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const char *next_path;
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int ret = cpio_find_next(file->file_addr, file->open_name, &size, &type, &next_addr, &next_path);
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if (ret < 0)
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{
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return -ENOENT;
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}
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#if FS_DEBUG
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printf("[cpiofs] readdir %s.\n", next_path);
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#endif
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file->file_addr = next_addr;
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dir->d_reclen = sizeof(*dir);
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strncpy(dir->d_name, next_path, sizeof(dir->d_name));
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dir->d_name[sizeof(dir->d_name) - 1] = 0;
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dir->d_type = type == 1 ? DT_DIR : DT_CHR;
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return sizeof(*dir);
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}
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int fs_svr_mkdir(char *path)
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{
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return -ENOSYS;
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}
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int fs_svr_unlink(const char *path)
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{
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return -ENOSYS;
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}
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int fs_svr_renmae(char *oldname, char *newname)
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{
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return -ENOSYS;
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}
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int fs_svr_fstat(int fd, void *_stat)
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{
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struct kstat *stat = _stat;
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file_desc_t *file = fd_get(thread_get_src_pid(), fd);
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if (!file)
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{
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return -ENOENT;
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}
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stat->st_size = file->file_size;
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stat->st_mode = file->type == 1 ? S_IFDIR : S_IFREG;
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return 0;
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}
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int fs_svr_symlink(const char *src, const char *dst)
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{
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return -ENOSYS;
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}
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int fs_svr_fsync(int fd)
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{
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return -ENOSYS;
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}
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int fs_svr_rmdir(char *path)
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{
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return -ENOSYS;
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}
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int fs_svr_rename(char *old, char *new)
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{
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return -ENOSYS;
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}
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int fs_svr_stat(const char *path, void *_buf)
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{
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umword_t size;
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int type;
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umword_t addr;
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struct kstat *buf = (struct kstat *)_buf;
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int ret = cpio_find_file((umword_t)sys_info.bootfs_start_addr,
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(umword_t)(-1), path, &size, &type, &addr);
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if (ret < 0)
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{
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return ret;
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}
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memset(buf, 0xff, sizeof(*buf));
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buf->st_mode = type == 1 ? S_IFDIR : S_IFREG;
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buf->st_size = size;
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return 0;
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}
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int fs_svr_ioctl(int fd, int req, void *arg)
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{
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return -ENOSYS;
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}
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ssize_t fs_svr_readlink(const char *path, char *buf, size_t bufsize)
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{
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return -ENOSYS;
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}
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int fs_svr_statfs(const char *path, struct statfs *buf)
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{
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return -ENOSYS;
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}
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void fs_svr_loop(void)
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{
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rpc_loop();
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}
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static const fs_operations_t ops =
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{
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.fs_svr_open = fs_svr_open,
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.fs_svr_read = fs_svr_read,
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.fs_svr_write = fs_svr_write,
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.fs_svr_close = fs_svr_close,
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.fs_svr_readdir = fs_svr_readdir,
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.fs_svr_lseek = fs_svr_lseek,
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.fs_svr_ftruncate = fs_svr_ftruncate,
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.fs_svr_fstat = fs_svr_fstat,
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.fs_svr_ioctl = fs_svr_ioctl,
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// .fs_svr_fcntl = fs_svr_fcntl,
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.fs_svr_fsync = fs_svr_fsync,
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.fs_svr_unlink = fs_svr_unlink,
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.fs_svr_symlink = fs_svr_symlink,
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.fs_svr_mkdir = fs_svr_mkdir,
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.fs_svr_rmdir = fs_svr_rmdir,
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.fs_svr_rename = fs_svr_rename,
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.fs_svr_stat = fs_svr_stat,
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.fs_svr_readlink = fs_svr_readlink,
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};
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void fs_svr_init(void)
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{
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msg_tag_t tag;
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fs_init(&fs, &ops);
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meta_reg_svr_obj(&fs.svr, FS_PROT);
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tag = sys_read_info(SYS_PROT, &sys_info, SYS_FLAGS_MAP_CPIO_FS);
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assert(msg_tag_get_val(tag) >= 0);
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} |