static int
sfs_lookup(struct inode *node, char *path, struct inode **node_store) {
struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
assert(*path != '\0' && *path != '/');
vop_ref_inc(node);
do {
struct sfs_inode *sin = vop_info(node, sfs_inode);
if (sin->din->type != SFS_TYPE_DIR) {
vop_ref_dec(node);
return -E_NOTDIR;
}
char *subpath;
next:
subpath = sfs_lookup_subpath(path);
if (strcmp(path, ".") == 0) {
if ((path = subpath) != NULL) {
goto next;
}
break;
}
int ret;
struct inode *subnode;
if (strcmp(path, "..") == 0) {
ret = sfs_load_parent(sfs, sin, &subnode);
}
else {
if (strlen(path) > SFS_MAX_FNAME_LEN) {
vop_ref_dec(node);
return -E_TOO_BIG;
}
ret = sfs_lookup_once(sfs, sin, path, &subnode, NULL);
}
vop_ref_dec(node);
if (ret != 0) {
return ret;
}
node = subnode, path = subpath;
} while (path != NULL);
*node_store = node;
return 0;
}
/*
* sfs_lookup - Parse path relative to the passed directory
* DIR, and hand back the inode for the file it
* refers to.
*/
static int
sfs_lookup(struct inode *node, char *path, struct inode **node_store) {
struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
assert(*path != '\0' && *path != '/');
vop_ref_inc(node);
struct sfs_inode *sin = vop_info(node, sfs_inode);
if (sin->din->type != SFS_TYPE_DIR) {
vop_ref_dec(node);
return -E_NOTDIR;
}
struct inode *subnode;
int ret = sfs_lookup_once(sfs, sin, path, &subnode, NULL);
vop_ref_dec(node);
if (ret != 0) {
return ret;
}
*node_store = subnode;
return 0;
}
/*
*sfs_namefile -Compute pathname relative to filesystem root of the file and copy to the specified io buffer.
*
*/
static int
sfs_namefile(struct inode *node, struct iobuf *iob) {
struct sfs_disk_entry *entry;
if (iob->io_resid <= 2 || (entry = kmalloc(sizeof(struct sfs_disk_entry))) == NULL) {
return -E_NO_MEM;
}
struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
struct sfs_inode *sin = vop_info(node, sfs_inode);
int ret;
char *ptr = iob->io_base + iob->io_resid;
size_t alen, resid = iob->io_resid - 2;
vop_ref_inc(node);
while (1) {
struct inode *parent;
if ((ret = sfs_lookup_once(sfs, sin, "..", &parent, NULL)) != 0) {
goto failed;
}
uint32_t ino = sin->ino;
vop_ref_dec(node);
if (node == parent) {
vop_ref_dec(node);
break;
}
node = parent, sin = vop_info(node, sfs_inode);
assert(ino != sin->ino && sin->din->type == SFS_TYPE_DIR);
lock_sin(sin);
{
ret = sfs_dirent_findino_nolock(sfs, sin, ino, entry);
}
unlock_sin(sin);
if (ret != 0) {
goto failed;
}
if ((alen = strlen(entry->name) + 1) > resid) {
goto failed_nomem;
}
resid -= alen, ptr -= alen;
memcpy(ptr, entry->name, alen - 1);
ptr[alen - 1] = '/';
}
alen = iob->io_resid - resid - 2;
ptr = memmove(iob->io_base + 1, ptr, alen);
ptr[-1] = '/', ptr[alen] = '\0';
iobuf_skip(iob, alen);
kfree(entry);
return 0;
failed_nomem:
ret = -E_NO_MEM;
failed:
vop_ref_dec(node);
kfree(entry);
return ret;
}