inode.c

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// File: src/inode.c
 
#include "inode.h"
#include <errno.h>
#include <unistd.h>

static off_t inode_offset(const struct sfuse_superblock *sb, uint32_t ino) {
  uint32_t inode_index = ino;
  off_t block_index =
      sb->inode_table_start + inode_index / SFUSE_INODES_PER_BLOCK;
  off_t offset_within_block =
      (inode_index % SFUSE_INODES_PER_BLOCK) * sizeof(struct sfuse_inode);
  return block_index * SFUSE_BLOCK_SIZE + offset_within_block;
}

int inode_load(int fd, const struct sfuse_superblock *sb, uint32_t ino,
               struct sfuse_inode *out) {
  off_t offs = inode_offset(sb, ino);
  ssize_t n = pread(fd, out, sizeof(struct sfuse_inode), offs);
  if (n < 0) {
    return -errno;
  }
  return (n == sizeof(struct sfuse_inode) ? 0 : -EIO);
}

int inode_sync(int fd, const struct sfuse_superblock *sb, uint32_t ino,
               const struct sfuse_inode *in) {
  off_t offs = inode_offset(sb, ino);
  ssize_t n = pwrite(fd, in, sizeof(struct sfuse_inode), offs);
  if (n < 0) {
    return -errno;
  }
  return (n == sizeof(struct sfuse_inode) ? 0 : -EIO);
}