111 lines
2.1 KiB
C
111 lines
2.1 KiB
C
#include <defs.h>
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#include <string.h>
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#include <vfs.h>
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#include <inode.h>
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#include <unistd.h>
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#include <error.h>
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#include <assert.h>
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// open file in vfs, get/create inode for file with filename path.
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int
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vfs_open(char *path, uint32_t open_flags, struct inode **node_store) {
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bool can_write = 0;
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switch (open_flags & O_ACCMODE) {
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case O_RDONLY:
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break;
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case O_WRONLY:
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case O_RDWR:
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can_write = 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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if (open_flags & O_TRUNC) {
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if (!can_write) {
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return -E_INVAL;
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}
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}
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int ret;
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struct inode *node;
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bool excl = (open_flags & O_EXCL) != 0;
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bool create = (open_flags & O_CREAT) != 0;
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ret = vfs_lookup(path, &node);
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if (ret != 0) {
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if (ret == -16 && (create)) {
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char *name;
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struct inode *dir;
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if ((ret = vfs_lookup_parent(path, &dir, &name)) != 0) {
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return ret;
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}
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ret = vop_create(dir, name, excl, &node);
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} else return ret;
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} else if (excl && create) {
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return -E_EXISTS;
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}
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assert(node != NULL);
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if ((ret = vop_open(node, open_flags)) != 0) {
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vop_ref_dec(node);
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return ret;
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}
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vop_open_inc(node);
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if (open_flags & O_TRUNC || create) {
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if ((ret = vop_truncate(node, 0)) != 0) {
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vop_open_dec(node);
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vop_ref_dec(node);
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return ret;
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}
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}
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*node_store = node;
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return 0;
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}
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// close file in vfs
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int
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vfs_close(struct inode *node) {
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vop_open_dec(node);
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vop_ref_dec(node);
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return 0;
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}
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// unimplement
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int
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vfs_unlink(char *path) {
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return -E_UNIMP;
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}
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// unimplement
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int
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vfs_rename(char *old_path, char *new_path) {
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return -E_UNIMP;
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}
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// unimplement
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int
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vfs_link(char *old_path, char *new_path) {
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return -E_UNIMP;
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}
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// unimplement
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int
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vfs_symlink(char *old_path, char *new_path) {
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return -E_UNIMP;
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}
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// unimplement
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int
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vfs_readlink(char *path, struct iobuf *iob) {
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return -E_UNIMP;
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}
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// unimplement
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int
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vfs_mkdir(char *path){
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return -E_UNIMP;
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}
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