/*
* sfs_dirent_search_nolock - read every file entry in the DIR, compare file name with each entry->name
* If equal, then return slot and NO. of disk of this file's inode
* @sfs: sfs file system
* @sin: sfs inode in memory
* @name: the filename
* @ino_store: NO. of disk of this file (with the filename)'s inode
* @slot: logical index of file entry (NOTICE: each file entry ocupied one disk block)
* @empty_slot: the empty logical index of file entry.
*/
static int
sfs_dirent_search_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name, uint32_t *ino_store, int *slot, int *empty_slot) {
assert(strlen(name) <= SFS_MAX_FNAME_LEN);
struct sfs_disk_entry *entry;
if ((entry = kmalloc(sizeof(struct sfs_disk_entry))) == NULL) {
return -E_NO_MEM;
}
#define set_pvalue(x, v) do { if ((x) != NULL) { *(x) = (v); } } while (0)
int ret, i, nslots = sin->din->blocks;
set_pvalue(empty_slot, nslots);
for (i = 0; i < nslots; i ++) {
if ((ret = sfs_dirent_read_nolock(sfs, sin, i, entry)) != 0) {
goto out;
}
if (entry->ino == 0) {
set_pvalue(empty_slot, i);
continue ;
}
if (strcmp(name, entry->name) == 0) {
set_pvalue(slot, i);
set_pvalue(ino_store, entry->ino);
goto out;
}
}
#undef set_pvalue
ret = -E_NOENT;
out:
kfree(entry);
return ret;
}
static int
sfs_dirent_findino_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, uint32_t ino, struct sfs_disk_entry *entry) {
int ret, i, nslots = sin->din->blocks;
for (i = 0; i < nslots; i ++) {
if ((ret = sfs_dirent_read_nolock(sfs, sin, i, entry)) != 0) {
return ret;
}
if (entry->ino == ino) {
return 0;
}
}
return -E_NOENT;
}
/*
* sfs_getdirentry_sub_noblock - get the content of file entry in DIR
*/
static int
sfs_getdirentry_sub_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, int slot, struct sfs_disk_entry *entry) {
int ret, i, nslots = sin->din->blocks;
for (i = 0; i < nslots; i ++) {
if ((ret = sfs_dirent_read_nolock(sfs, sin, i, entry)) != 0) {
return ret;
}
if (entry->ino != 0) {
if (slot == 0) {
return 0;
}
slot --;
}
}
return -E_NOENT;
}
static int
sfs_getdirentry_sub_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, int slot, struct sfs_disk_entry *entry) {
int ret, i, nslots = sin->din->blocks;
// kprintf("%s %s %d din->blocks is %d\n", __FILE__, __func__, __LINE__, nslots);
for (i = 0; i < nslots; i ++) {
if ((ret = sfs_dirent_read_nolock(sfs, sin, i, entry)) != 0) {
// kprintf("%s %s %d can not read entry\n", __FILE__, __func__, __LINE__);
return ret;
}
// kprintf("%s\n", __func__);
if (entry->ino != 0) {
if (slot == 0) {
return 0;
}
slot --;
}
}
return -E_NOENT;
}
