int
fs_rmdir(const char *path)
{
struct inode *dir;
struct dirent *dent;
uint32_t nblock, i, j;
char *blk;
int r;
if ((r = inode_open(path, &dir)) < 0)
return r;
if (dir == diskaddr(super->s_root))
return -EPERM;
if (!S_ISDIR(dir->i_mode))
return -ENOTDIR;
nblock = dir->i_size / BLKSIZE;
for (i = 0; i < nblock; i++) {
if ((r = inode_get_block(dir, i, &blk)) < 0)
return r;
dent = (struct dirent *)blk;
for (j = 0; j < BLKDIRENTS; ++j)
if (dent[j].d_name[0] != '\0')
return -ENOTEMPTY;
}
return inode_unlink(path);
}
// Writes an inode to disk.
static void inode_write(unsigned int inode_n, inode * n){
unsigned int locin_block_index = inode_get_block_index(inode_n);
unsigned int real_block_index = inode_get_block(inode_n);
block b;
block_clear(&b);
block_read((void *)&b, real_block_index);
inode * inodes = (inode *) &b;
int i = 0;
for (; i < FS_INODE_SIZE / sizeof(int); i++) {
((int *)&inodes[locin_block_index])[i] = ((int*)n)[i];
}
block_write((void *)&b, real_block_index);
}
int
fs_readlink(const char *path, char *target, size_t len)
{
struct inode *ino;
size_t copylen;
char *blk;
int r;
if ((r = inode_open(path, &ino)) < 0)
return r;
if ((r = inode_get_block(ino, 0, &blk)) < 0)
return r;
copylen = MIN(ino->i_size, len - 1);
memcpy(target, blk, copylen);
target[copylen] = '\0';
return 0;
}
int
fs_symlink(const char *dstpath, const char *srcpath)
{
struct inode *ino;
struct fuse_context *ctxt;
time_t curtime;
size_t dstlen;
char *blk;
int r;
if ((dstlen = strlen(dstpath)) >= PATH_MAX)
return -ENAMETOOLONG;
if ((r = inode_create(srcpath, &ino)) < 0) {
return r;
}
ino->i_size = dstlen;
ino->i_mode = S_IFLNK | 0777;
ino->i_nlink = 1;
curtime = time(NULL);
ino->i_atime = curtime;
ino->i_ctime = curtime;
ino->i_mtime = curtime;
ctxt = fuse_get_context();
ino->i_owner = ctxt->uid;
ino->i_group = ctxt->gid;
if ((r = inode_get_block(ino, 0, &blk)) < 0) {
inode_unlink(srcpath);
return r;
}
memcpy(blk, dstpath, dstlen);
inode_flush(ino);
return 0;
}
void
fs_test(void)
{
struct inode *ino, *ino2;
int r;
char *blk;
uint32_t bits[4096];
// back up bitmap
memmove(bits, bitmap, 4096);
// allocate block
if ((r = alloc_block()) < 0)
panic("alloc_block: %s", strerror(-r));
// check that block was free
assert(bits[r/32] & (1 << (r%32)));
// and is not free any more
assert(!(bitmap[r/32] & (1 << (r%32))));
free_block(r);
printf("alloc_block is good\n");
if ((r = inode_open("/not-found", &ino)) < 0 && r != -ENOENT)
panic("inode_open /not-found: %s", strerror(-r));
else if (r == 0)
panic("inode_open /not-found succeeded!");
if ((r = inode_open("/msg", &ino)) < 0)
panic("inode_open /msg: %s", strerror(-r));
printf("inode_open is good\n");
if ((r = inode_get_block(ino, 0, &blk)) < 0)
panic("inode_get_block: %s", strerror(-r));
if (strcmp(blk, msg) != 0)
panic("inode_get_block returned wrong data");
printf("inode_get_block is good\n");
if ((r = inode_set_size(ino, 0)) < 0)
panic("inode_set_size: %s", strerror(-r));
assert(ino->i_direct[0] == 0);
printf("inode_truncate is good\n");
if ((r = inode_set_size(ino, strlen(msg))) < 0)
panic("inode_set_size 2: %s", strerror(-r));
if ((r = inode_get_block(ino, 0, &blk)) < 0)
panic("inode_get_block 2: %s", strerror(-r));
strcpy(blk, msg);
printf("file rewrite is good\n");
if ((r = inode_link("/msg", "/linkmsg")) < 0)
panic("inode_link /msg /linkmsg: %s", strerror(-r));
if ((r = inode_open("/msg", &ino)) < 0)
panic("inode_open /msg: %s", strerror(-r));
if ((r = inode_open("/linkmsg", &ino2)) < 0)
panic("inode_open /linkmsg: %s", strerror(-r));
if (ino != ino2)
panic("linked files do not point to same inode");
if (ino->i_nlink != 2)
panic("link count incorrect: %u, expected 2", ino->i_nlink);
printf("inode_link is good\n");
if ((r = inode_unlink("/linkmsg")) < 0)
panic("inode_unlink /linkmsg: %s", strerror(-r));
if ((r = inode_open("/linkmsg", &ino2)) < 0 && r != -ENOENT)
panic("inode_open /linkmsg after unlink: %s", strerror(-r));
else if (r == 0)
panic("inode_open /linkmsg after unlink succeeded!");
if ((r = inode_open("/msg", &ino)) < 0)
panic("inode_open /msg after /linkmsg unlinked: %s", strerror(-r));
if (ino->i_nlink != 1)
panic("link count incorrect: %u, expected 1", ino->i_nlink);
printf("inode_unlink is good\n");
}