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356 Zeilen
8.4 KiB
356 Zeilen
8.4 KiB
#include <defs.h>
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#include <string.h>
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#include <vfs.h>
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#include <proc.h>
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#include <file.h>
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#include <unistd.h>
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#include <iobuf.h>
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#include <inode.h>
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#include <stat.h>
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#include <dirent.h>
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#include <error.h>
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#include <assert.h>
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#define testfd(fd) ((fd) >= 0 && (fd) < FILES_STRUCT_NENTRY)
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// get_fd_array - get current process's open files table
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static struct file *
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get_fd_array(void) {
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struct files_struct *filesp = current->filesp;
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assert(filesp != NULL && files_count(filesp) > 0);
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return filesp->fd_array;
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}
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// fd_array_init - initialize the open files table
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void
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fd_array_init(struct file *fd_array) {
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int fd;
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struct file *file = fd_array;
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for (fd = 0; fd < FILES_STRUCT_NENTRY; fd ++, file ++) {
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file->open_count = 0;
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file->status = FD_NONE, file->fd = fd;
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}
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}
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// fs_array_alloc - allocate a free file item (with FD_NONE status) in open files table
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static int
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fd_array_alloc(int fd, struct file **file_store) {
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// panic("debug");
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struct file *file = get_fd_array();
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if (fd == NO_FD) {
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for (fd = 0; fd < FILES_STRUCT_NENTRY; fd ++, file ++) {
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if (file->status == FD_NONE) {
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goto found;
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}
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}
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return -E_MAX_OPEN;
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}
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else {
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if (testfd(fd)) {
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file += fd;
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if (file->status == FD_NONE) {
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goto found;
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}
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return -E_BUSY;
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}
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return -E_INVAL;
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}
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found:
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assert(fopen_count(file) == 0);
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file->status = FD_INIT, file->node = NULL;
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*file_store = file;
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return 0;
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}
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// fd_array_free - free a file item in open files table
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static void
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fd_array_free(struct file *file) {
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assert(file->status == FD_INIT || file->status == FD_CLOSED);
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assert(fopen_count(file) == 0);
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if (file->status == FD_CLOSED) {
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vfs_close(file->node);
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}
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file->status = FD_NONE;
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}
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static void
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fd_array_acquire(struct file *file) {
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assert(file->status == FD_OPENED);
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fopen_count_inc(file);
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}
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// fd_array_release - file's open_count--; if file's open_count-- == 0 , then call fd_array_free to free this file item
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static void
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fd_array_release(struct file *file) {
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assert(file->status == FD_OPENED || file->status == FD_CLOSED);
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assert(fopen_count(file) > 0);
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if (fopen_count_dec(file) == 0) {
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fd_array_free(file);
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}
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}
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// fd_array_open - file's open_count++, set status to FD_OPENED
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void
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fd_array_open(struct file *file) {
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assert(file->status == FD_INIT && file->node != NULL);
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file->status = FD_OPENED;
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fopen_count_inc(file);
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}
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// fd_array_close - file's open_count--; if file's open_count-- == 0 , then call fd_array_free to free this file item
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void
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fd_array_close(struct file *file) {
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assert(file->status == FD_OPENED);
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assert(fopen_count(file) > 0);
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file->status = FD_CLOSED;
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if (fopen_count_dec(file) == 0) {
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fd_array_free(file);
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}
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}
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//fs_array_dup - duplicate file 'from' to file 'to'
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void
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fd_array_dup(struct file *to, struct file *from) {
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//cprintf("[fd_array_dup]from fd=%d, to fd=%d\n",from->fd, to->fd);
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assert(to->status == FD_INIT && from->status == FD_OPENED);
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to->pos = from->pos;
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to->readable = from->readable;
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to->writable = from->writable;
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struct inode *node = from->node;
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vop_ref_inc(node), vop_open_inc(node);
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to->node = node;
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fd_array_open(to);
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}
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// fd2file - use fd as index of fd_array, return the array item (file)
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static inline int
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fd2file(int fd, struct file **file_store) {
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if (testfd(fd)) {
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struct file *file = get_fd_array() + fd;
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if (file->status == FD_OPENED && file->fd == fd) {
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*file_store = file;
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return 0;
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}
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}
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return -E_INVAL;
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}
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// file_testfd - test file is readble or writable?
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bool
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file_testfd(int fd, bool readable, bool writable) {
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int ret;
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struct file *file;
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if ((ret = fd2file(fd, &file)) != 0) {
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return 0;
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}
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if (readable && !file->readable) {
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return 0;
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}
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if (writable && !file->writable) {
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return 0;
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}
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return 1;
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}
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// open file
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int
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file_open(char *path, uint32_t open_flags) {
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bool readable = 0, writable = 0;
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switch (open_flags & O_ACCMODE) {
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case O_RDONLY: readable = 1; break;
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case O_WRONLY: writable = 1; break;
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case O_RDWR:
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readable = writable = 1;
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break;
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default:
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return -E_INVAL;
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}
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int ret;
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struct file *file;
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if ((ret = fd_array_alloc(NO_FD, &file)) != 0) {
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return ret;
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}
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struct inode *node;
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if ((ret = vfs_open(path, open_flags, &node)) != 0) {
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fd_array_free(file);
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return ret;
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}
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file->pos = 0;
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if (open_flags & O_APPEND) {
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struct stat __stat, *stat = &__stat;
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if ((ret = vop_fstat(node, stat)) != 0) {
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vfs_close(node);
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fd_array_free(file);
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return ret;
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}
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file->pos = stat->st_size;
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}
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file->node = node;
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file->readable = readable;
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file->writable = writable;
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fd_array_open(file);
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return file->fd;
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}
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// close file
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int
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file_close(int fd) {
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int ret;
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struct file *file;
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if ((ret = fd2file(fd, &file)) != 0) {
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return ret;
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}
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fd_array_close(file);
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return 0;
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}
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// read file
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int
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file_read(int fd, void *base, size_t len, size_t *copied_store) {
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int ret;
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struct file *file;
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*copied_store = 0;
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if ((ret = fd2file(fd, &file)) != 0) {
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return ret;
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}
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if (!file->readable) {
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return -E_INVAL;
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}
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fd_array_acquire(file);
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struct iobuf __iob, *iob = iobuf_init(&__iob, base, len, file->pos);
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ret = vop_read(file->node, iob);
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size_t copied = iobuf_used(iob);
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if (file->status == FD_OPENED) {
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file->pos += copied;
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}
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*copied_store = copied;
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fd_array_release(file);
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return ret;
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}
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// write file
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int
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file_write(int fd, void *base, size_t len, size_t *copied_store) {
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int ret;
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struct file *file;
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*copied_store = 0;
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if ((ret = fd2file(fd, &file)) != 0) {
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return ret;
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}
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if (!file->writable) {
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return -E_INVAL;
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}
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fd_array_acquire(file);
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struct iobuf __iob, *iob = iobuf_init(&__iob, base, len, file->pos);
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ret = vop_write(file->node, iob);
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size_t copied = iobuf_used(iob);
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if (file->status == FD_OPENED) {
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file->pos += copied;
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}
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*copied_store = copied;
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fd_array_release(file);
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return ret;
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}
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// seek file
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int
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file_seek(int fd, off_t pos, int whence) {
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struct stat __stat, *stat = &__stat;
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int ret;
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struct file *file;
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if ((ret = fd2file(fd, &file)) != 0) {
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return ret;
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}
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fd_array_acquire(file);
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switch (whence) {
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case LSEEK_SET: break;
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case LSEEK_CUR: pos += file->pos; break;
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case LSEEK_END:
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if ((ret = vop_fstat(file->node, stat)) == 0) {
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pos += stat->st_size;
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}
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break;
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default: ret = -E_INVAL;
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}
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if (ret == 0) {
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if ((ret = vop_tryseek(file->node, pos)) == 0) {
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file->pos = pos;
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}
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// cprintf("file_seek, pos=%d, whence=%d, ret=%d\n", pos, whence, ret);
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}
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fd_array_release(file);
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return ret;
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}
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// stat file
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int
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file_fstat(int fd, struct stat *stat) {
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int ret;
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struct file *file;
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if ((ret = fd2file(fd, &file)) != 0) {
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return ret;
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}
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fd_array_acquire(file);
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ret = vop_fstat(file->node, stat);
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fd_array_release(file);
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return ret;
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}
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// sync file
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int
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file_fsync(int fd) {
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int ret;
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struct file *file;
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if ((ret = fd2file(fd, &file)) != 0) {
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return ret;
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}
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fd_array_acquire(file);
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ret = vop_fsync(file->node);
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fd_array_release(file);
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return ret;
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}
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// get file entry in DIR
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int
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file_getdirentry(int fd, struct dirent *direntp) {
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int ret;
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struct file *file;
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if ((ret = fd2file(fd, &file)) != 0) {
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return ret;
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}
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fd_array_acquire(file);
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struct iobuf __iob, *iob = iobuf_init(&__iob, direntp->name, sizeof(direntp->name), direntp->offset);
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if ((ret = vop_getdirentry(file->node, iob)) == 0) {
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direntp->offset += iobuf_used(iob);
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}
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fd_array_release(file);
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return ret;
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}
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// duplicate file
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int
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file_dup(int fd1, int fd2) {
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int ret;
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struct file *file1, *file2;
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if ((ret = fd2file(fd1, &file1)) != 0) {
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return ret;
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}
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if ((ret = fd_array_alloc(fd2, &file2)) != 0) {
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return ret;
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}
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fd_array_dup(file2, file1);
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return file2->fd;
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}
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