static int
testfs_pwd(struct super_block *sb, struct inode *in)
{
int p_inode_nr;
struct inode *p_in;
struct dirent *d;
int ret;
assert(in);
assert(testfs_inode_get_nr(in) >= 0);
p_inode_nr = testfs_dir_name_to_inode_nr(in, "..");
assert(p_inode_nr >= 0);
if (p_inode_nr == testfs_inode_get_nr(in)) {
printf("/");
return 1;
}
p_in = testfs_get_inode(sb, p_inode_nr);
d = testfs_find_dirent(p_in, testfs_inode_get_nr(in));
assert(d);
ret = testfs_pwd(sb, p_in);
testfs_put_inode(p_in);
printf("%s%s", ret == 1 ? "" : "/", D_NAME(d));
free(d);
return 0;
}
static int testfs_checkfs(struct super_block *sb, struct bitmap *i_freemap,
struct bitmap *b_freemap, int inode_nr) {
struct inode *in = testfs_get_inode(sb, inode_nr);
int size;
int size_roundup = ROUNDUP(testfs_inode_get_size(in), BLOCK_SIZE);
assert((testfs_inode_get_type(in) == I_FILE) || (testfs_inode_get_type(in) == I_DIR));
/* inode processing */
bitmap_mark(i_freemap, inode_nr);
if (testfs_inode_get_type(in) == I_DIR) {
int offset = 0;
struct dirent *d;
for (; (d = testfs_next_dirent(in, &offset)); free(d)) {
if ((d->d_inode_nr < 0) || (strcmp(D_NAME(d), ".") == 0)
|| (strcmp(D_NAME(d), "..") == 0))
continue;
testfs_checkfs(sb, i_freemap, b_freemap, d->d_inode_nr);
}
}
/* block processing */
size = testfs_check_inode(sb, b_freemap, in);
assert(size == size_roundup);
testfs_put_inode(in);
return 0;
}
int
cmd_write(struct super_block *sb, struct context *c)
{
int inode_nr;
struct inode *in;
int size;
int ret = 0;
char * filename = c->cmd[1];
char * content = c->cmd[2];
if (c->nargs != 3) {
return -EINVAL;
}
inode_nr = testfs_dir_name_to_inode_nr(c->cur_dir, filename);
if (inode_nr < 0)
return inode_nr;
in = testfs_get_inode(sb, inode_nr);
if (testfs_inode_get_type(in) == I_DIR) {
ret = -EISDIR;
goto out;
}
size = strlen(content);
testfs_tx_start(sb, TX_WRITE);
ret = testfs_write_data(in, 0, content, size);
if (ret >= 0) {
testfs_truncate_data(in, size);
}
testfs_sync_inode(in);
testfs_tx_commit(sb, TX_WRITE);
out:
testfs_put_inode(in);
return ret;
}
int main(int argc, char * const argv[]) {
struct super_block *sb;
char *line = NULL;
size_t line_size = 0;
ssize_t nr;
int ret;
struct context c;
// context contains command line arguments/parameters,
// inode of directory from which cmd was issued, and no of args.
struct args * args = parse_arguments(argc, argv);
// args->disk contains the name of the disk file.
// initializes the in memory structure sb with data that is
// read from the disk. after successful execution, we have
// sb initialized to dsuper_block read from disk.
ret = testfs_init_super_block(args->disk, args->corrupt, &sb);
//fslice_clear();
if (ret) {
EXIT("testfs_init_super_block");
}
/* if the inode does not exist in the inode_hash_map (which
is an inmemory map of all inode blocks, create a new inode by
allocating memory to it. read the dinode from disk into that
memory inode
*/
c.cur_dir = testfs_get_inode(sb, 0); /* root dir */
for (;
PROMPT, (nr = getline(&line, &line_size, stdin)) != EOF;) {
char * name;
char * args;
printf("command: %s\n", line);
name = strtok(line, " \t\n");
args = strtok(NULL, "\n");
handle_command(sb, &c, name, args);
if (can_quit) {
break;
}
}
free(line);
// decrement inode count by 1. remove inode from in_memory hash map if
// inode count has become 0.
testfs_put_inode(c.cur_dir);
testfs_close_super_block(sb);
return 0;
}
int
cmd_cat(struct super_block *sb, struct context *c)
{
char *buf;
int inode_nr;
struct inode *in;
int ret = 0;
int sz;
int i;
if (c->nargs < 2) {
return -EINVAL;
}
for (i = 1; ret == 0 && i < c->nargs; i++ )
{
inode_nr = testfs_dir_name_to_inode_nr(c->cur_dir, c->cmd[i]);
if (inode_nr < 0)
return inode_nr;
in = testfs_get_inode(sb, inode_nr);
if (testfs_inode_get_type(in) == I_DIR) {
ret = -EISDIR;
goto out;
}
sz = testfs_inode_get_size(in);
if (sz > 0) {
buf = malloc(sz + 1);
if (!buf) {
ret = -ENOMEM;
goto out;
}
testfs_read_data(in, 0, buf, sz);
buf[sz] = 0;
printf("%s\n", buf);
free(buf);
}
out:
testfs_put_inode(in);
}
return ret;
}
int
cmd_rm(struct super_block *sb, struct context *c)
{
int inode_nr;
struct inode *in;
if (c->nargs != 2) {
return -EINVAL;
}
testfs_tx_start(sb, TX_RM);
inode_nr = testfs_remove_dirent(sb, c->cur_dir, c->cmd[1]);
if (inode_nr < 0) {
testfs_tx_commit(sb, TX_RM);
return inode_nr;
}
in = testfs_get_inode(sb, inode_nr);
testfs_remove_inode(in);
testfs_sync_inode(c->cur_dir);
testfs_tx_commit(sb, TX_RM);
return 0;
}
int
cmd_cd(struct super_block *sb, struct context *c)
{
int inode_nr;
struct inode *dir_inode;
if (c->nargs != 2) {
return -EINVAL;
}
inode_nr = testfs_dir_name_to_inode_nr(c->cur_dir, c->cmd[1]);
if (inode_nr < 0)
return inode_nr;
dir_inode = testfs_get_inode(sb, inode_nr);
if (testfs_inode_get_type(dir_inode) != I_DIR) {
testfs_put_inode(dir_inode);
return -ENOTDIR;
}
testfs_put_inode(c->cur_dir);
c->cur_dir = dir_inode;
return 0;
}
/* returns negative value if name within dir is not empty */
static int
testfs_remove_dirent_allowed(struct super_block *sb, int inode_nr)
{
struct inode *dir;
int offset = 0;
struct dirent *d;
int ret = 0;
dir = testfs_get_inode(sb, inode_nr);
if (testfs_inode_get_type(dir) != I_DIR)
goto out;
for (; ret == 0 && (d = testfs_next_dirent(dir, &offset)); free(d)) {
if ((d->d_inode_nr < 0) || (strcmp(D_NAME(d), ".") == 0) ||
(strcmp(D_NAME(d), "..") == 0))
continue;
ret = -ENOTEMPTY;
}
out:
testfs_put_inode(dir);
return ret;
}
int
cmd_lsr(struct super_block *sb, struct context *c)
{
int inode_nr;
struct inode *in;
char *cdir = ".";
if (c->nargs != 1 && c->nargs != 2) {
return -EINVAL;
}
if (c->nargs == 2) {
cdir = c->cmd[1];
}
assert(c->cur_dir);
inode_nr = testfs_dir_name_to_inode_nr(c->cur_dir, cdir);
if (inode_nr < 0)
return inode_nr;
in = testfs_get_inode(sb, inode_nr);
testfs_ls(in, 1);
testfs_put_inode(in);
return 0;
}
int
cmd_stat(struct super_block *sb, struct context *c)
{
int inode_nr;
struct inode *in;
int i;
if (c->nargs < 2) {
return -EINVAL;
}
for (i = 1; i < c->nargs; i++ )
{
inode_nr = testfs_dir_name_to_inode_nr(c->cur_dir, c->cmd[i]);
if (inode_nr < 0)
return inode_nr;
in = testfs_get_inode(sb, inode_nr);
printf("%s: i_nr = %d, i_type = %d, i_size = %d\n", c->cmd[i],
testfs_inode_get_nr(in), testfs_inode_get_type(in),
testfs_inode_get_size(in));
testfs_put_inode(in);
}
return 0;
}
static int
testfs_ls(struct inode *in, int recursive)
{
int offset = 0;
struct dirent *d;
for (; (d = testfs_next_dirent(in, &offset)); free(d)) {
struct inode *cin;
if (d->d_inode_nr < 0)
continue;
cin = testfs_get_inode(testfs_inode_get_sb(in), d->d_inode_nr);
printf("%s%s\n", D_NAME(d),
(testfs_inode_get_type(cin) == I_DIR) ? "/":"");
if (recursive && testfs_inode_get_type(cin) == I_DIR &&
(strcmp(D_NAME(d), ".") != 0) &&
(strcmp(D_NAME(d), "..") != 0)) {
testfs_ls(cin, recursive);
}
testfs_put_inode(cin);
}
return 0;
}