dir.c

이 파일의 문서화 페이지로 가기

// File: src/dir.c
 
#include "dir.h"
#include "block.h"
#include "inode.h"
#include <errno.h>
#include <string.h>
#include <sys/types.h>

int dir_lookup(const struct sfuse_fs *fs, uint32_t dir_ino, const char *name,
               uint32_t *out_ino) {
  struct sfuse_inode dir_inode;
  if (inode_load(fs->backing_fd, &fs->sb, dir_ino, &dir_inode) < 0) {
    return -ENOENT;
  }
 
  /* 모든 direct 블록 순회 */
  for (uint32_t i = 0; i < 12; i++) {
    uint32_t blk = dir_inode.direct[i];
    if (blk == 0)
      continue; 
 
    uint8_t block[SFUSE_BLOCK_SIZE]; 
    if (read_block(fs->backing_fd, blk, block) < 0) {
      return -EIO;
    }
 
    struct sfuse_dirent *entries = (struct sfuse_dirent *)block;
    for (uint32_t j = 0; j < DENTS_PER_BLOCK; ++j) {
      if (entries[j].inode == 0)
        continue; 
      if (strncmp(entries[j].name, name, SFUSE_NAME_MAX) == 0) {
        *out_ino = entries[j].inode;
        return 0;
      }
    }
  }
  return -ENOENT;
}

int dir_list(const struct sfuse_fs *fs, uint32_t dir_ino, void *buf,
             fuse_fill_dir_t filler, off_t offset) {
  struct sfuse_inode dir_inode;
  if (inode_load(fs->backing_fd, &fs->sb, dir_ino, &dir_inode) < 0) {
    return -ENOENT;
  }
 
  /* "." 및 ".." 기본 엔트리 추가 */
  filler(buf, ".", NULL, 0, 0);
  filler(buf, "..", NULL, 0, 0);
 
  /* 저장된 디렉터리 엔트리 나열 */
  for (uint32_t i = 0; i < 12; i++) {
    uint32_t blk = dir_inode.direct[i];
    if (blk == 0)
      break; 
 
    uint8_t block[SFUSE_BLOCK_SIZE]; 
    if (read_block(fs->backing_fd, blk, block) < 0) {
      return -EIO;
    }
 
    struct sfuse_dirent *entries = (struct sfuse_dirent *)block;
    for (uint32_t j = 0; j < DENTS_PER_BLOCK; ++j) {
      if (entries[j].inode == 0)
        continue; 
      if (entries[j].name[0] == '\0')
        continue; 
      filler(buf, entries[j].name, NULL, 0, 0);
    }
  }
  return 0;
}