static int
sfs_rename2_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name, struct sfs_inode *newsin, const char *new_name) {
uint32_t ino;
int ret, slot1, slot2;
if ((ret = sfs_dirent_search_nolock(sfs, sin, name, &ino, &slot1, NULL)) != 0) {
return ret;
}
if ((ret = sfs_dirent_search_nolock(sfs, newsin, new_name, NULL, NULL, &slot2)) != -E_NOENT) {
return (ret != 0) ? ret : -E_EXISTS;
}
struct inode *link_node;
if ((ret = sfs_load_inode(sfs, &link_node, ino)) != 0) {
return ret;
}
struct sfs_inode *lnksin = vop_info(link_node, sfs_inode);
if ((ret = sfs_dirent_unlink_nolock(sfs, sin, slot1, lnksin)) != 0) {
goto out;
}
int isdir = (lnksin->din->type == SFS_TYPE_DIR);
/* remove '..' link from old parent */
if (isdir) {
sfs_nlinks_dec_nolock(sin);
}
/* if link fails try to recover its old link */
if ((ret = sfs_dirent_link_nolock(sfs, newsin, slot2, lnksin, new_name)) != 0) {
if (sfs_dirent_link_nolock_check(sfs, sin, slot1, lnksin, name) == 0) {
if (isdir) {
sfs_nlinks_inc_nolock(sin);
}
}
goto out;
}
if (isdir) {
/* set '..' link to new directory */
sfs_nlinks_inc_nolock(newsin);
/* update parent relationship */
sfs_dirinfo_set_parent(lnksin, newsin);
}
out:
vop_ref_dec(link_node);
return ret;
}
static int
sfs_rename1_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name, const char *new_name) {
if (strcmp(name, new_name) == 0) {
return 0;
}
int ret, slot;
uint32_t ino;
if ((ret = sfs_dirent_search_nolock(sfs, sin, name, &ino, &slot, NULL)) != 0) {
return ret;
}
if ((ret = sfs_dirent_search_nolock(sfs, sin, new_name, NULL, NULL, NULL)) != -E_NOENT) {
return (ret != 0) ? ret : -E_EXISTS;
}
return sfs_dirent_write_nolock(sfs, sin, slot, ino, new_name);
}
static int
sfs_mkdir_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name) {
int ret, slot;
if ((ret = sfs_dirent_search_nolock(sfs, sin, name, NULL, NULL, &slot)) != -E_NOENT) {
return (ret != 0) ? ret : -E_EXISTS;
}
struct inode *link_node;
if ((ret = sfs_dirent_create_inode(sfs, SFS_TYPE_DIR, &link_node)) != 0) {
return ret;
}
struct sfs_inode *lnksin = vop_info(link_node, sfs_inode);
if ((ret = sfs_dirent_link_nolock(sfs, sin, slot, lnksin, name)) != 0) {
assert(lnksin->din->nlinks == 0);
assert(inode_ref_count(link_node) == 1 && inode_open_count(link_node) == 0);
goto out;
}
/* set parent */
sfs_dirinfo_set_parent(lnksin, sin);
/* add '.' link to itself */
sfs_nlinks_inc_nolock(lnksin);
/* add '..' link to parent */
sfs_nlinks_inc_nolock(sin);
out:
vop_ref_dec(link_node);
return ret;
}
static int
sfs_create_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name, bool excl, struct inode **node_store) {
int ret, slot;
uint32_t ino;
struct inode *link_node;
if ((ret = sfs_dirent_search_nolock(sfs, sin, name, &ino, NULL, &slot)) != -E_NOENT) {
if (ret != 0) {
return ret;
}
if (!excl) {
if ((ret = sfs_load_inode(sfs, &link_node, ino)) != 0) {
return ret;
}
if (vop_info(link_node, sfs_inode)->din->type == SFS_TYPE_FILE) {
goto out;
}
vop_ref_dec(link_node);
}
return -E_EXISTS;
}
else {
if ((ret = sfs_dirent_create_inode(sfs, SFS_TYPE_FILE, &link_node)) != 0) {
return ret;
}
if ((ret = sfs_dirent_link_nolock(sfs, sin, slot, vop_info(link_node, sfs_inode), name)) != 0) {
vop_ref_dec(link_node);
return ret;
}
}
out:
*node_store = link_node;
return 0;
}
static int
sfs_link_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, struct sfs_inode *lnksin, const char *name) {
int ret, slot;
if ((ret = sfs_dirent_search_nolock(sfs, sin, name, NULL, NULL, &slot)) != -E_NOENT) {
return (ret != 0) ? ret : -E_EXISTS;
}
return sfs_dirent_link_nolock(sfs, sin, slot, lnksin, name);
}
static int
sfs_lookup_once(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name, struct inode **node_store, int *slot) {
int ret;
uint32_t ino;
lock_sin(sin);
{
ret = sfs_dirent_search_nolock(sfs, sin, name, &ino, slot, NULL);
}
unlock_sin(sin);
if (ret == 0) {
ret = sfs_load_inode(sfs, node_store, ino);
}
return ret;
}
/*
* sfs_lookup_once - find inode corresponding the file name in DIR's sin inode
* @sfs: sfs file system
* @sin: DIR sfs inode in memory
* @name: the file name in DIR
* @node_store: the inode corresponding the file name in DIR
* @slot: the logical index of file entry
*/
static int
sfs_lookup_once(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name, struct inode **node_store, int *slot) {
int ret;
uint32_t ino;
lock_sin(sin);
{ // find the NO. of disk block and logical index of file entry
ret = sfs_dirent_search_nolock(sfs, sin, name, &ino, slot, NULL);
}
unlock_sin(sin);
if (ret == 0) {
// load the content of inode with the the NO. of disk block
ret = sfs_load_inode(sfs, node_store, ino);
}
return ret;
}
static int
sfs_unlink_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, const char *name) {
int ret, slot;
uint32_t ino;
if ((ret = sfs_dirent_search_nolock(sfs, sin, name, &ino, &slot, NULL)) != 0) {
return ret;
}
struct inode *link_node;
if ((ret = sfs_load_inode(sfs, &link_node, ino)) != 0) {
return ret;
}
struct sfs_inode *lnksin = vop_info(link_node, sfs_inode);
if (lnksin->din->type != SFS_TYPE_DIR) {
ret = sfs_dirent_unlink_nolock(sfs, sin, slot, lnksin);
}
else {
if ((ret = trylock_sin(lnksin)) == 0) {
if (lnksin->din->dirinfo.slots != 0) {
ret = -E_NOTEMPTY;
}
else if ((ret = sfs_dirent_unlink_nolock(sfs, sin, slot, lnksin)) == 0) {
/* lnksin must be empty, so set SFS_removed bit to invalidate further trylock opts */
SetSFSInodeRemoved(lnksin);
/* remove '.' link */
sfs_nlinks_dec_nolock(lnksin);
/* remove '..' link */
sfs_nlinks_dec_nolock(sin);
}
unlock_sin(lnksin);
}
}
vop_ref_dec(link_node);
return ret;
}
static int
sfs_create(struct inode *node, const char *name, bool excl, struct inode **node_store) {
// kprintf("ready to create a file\n");
if (strlen(name) > SFS_MAX_FNAME_LEN) {
return -1;
}
// sfs_create_inode(struct sfs_fs *sfs, struct sfs_disk_inode *din, uint32_t ino, struct inode **node_store)
struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
struct sfs_inode *sin = vop_info(node, sfs_inode);
int ret;
// sfs_create_inode(struct sfs_fs *sfs, struct sfs_disk_inode *din, uint32_t ino, struct inode **node_store)
struct inode *node_tmp = NULL;
int empty_slot = -1;
lock_sfs_fs(sfs);
// sfs_block_alloc(struct sfs_fs *sfs, uint32_t *ino_store)
sfs_dirent_search_nolock(sfs, sin, name, node_tmp, NULL, &empty_slot);
// kprintf("%s\n", __func__);
if (node_tmp) {
node_store = node_tmp;
} else {
if (empty_slot < 0) {
kprintf("no slot\n");
return -1;
}
struct sfs_disk_inode *din = alloc_disk_inode(SFS_TYPE_FILE);
int ino;
sfs_block_alloc(sfs, &ino);
// kprintf("%s\n", __func__);
// if (sfs_block_inuse(sfs, ino)) {
// kprintf("be sure use\n");
// } else {
// kprintf("not used\n");
// }
sfs_create_inode(sfs, din, ino, &node_tmp);
++ (din->__nlinks__);
sfs_set_links(sfs, vop_info(node_tmp, sfs_inode));
// kprintf("0x%08x\n", node_tmp);
// sfs_namefile(struct inode *node, struct iobuf *iob)
// sfs_dirent_write_nolock(struct sfs_fs *sfs, struct sfs_inode *sin, int slot, uint32_t ino, const char *name)
sfs_dirent_write_nolock(sfs, sin, empty_slot, ino, name);
// ++ sin->din->blocks;
int secno = ram2block(ino);
swapper_block_changed(secno);
swapper_block_late_sync(secno);
// kprintf("sin->ino is %d\n", sin->ino);
sin->dirty = 1;
lock_sin(sin);
{
if (sin->dirty) {
sin->dirty = 0;
if ((ret = sfs_wbuf(sfs, sin->din, sizeof(struct sfs_disk_inode), sin->ino, 0)) != 0) {
sin->dirty = 1;
}
}
}
unlock_sin(sin);
secno = ram2block(sin->ino);
swapper_block_changed(secno);
swapper_block_late_sync(secno);
vop_info(node_tmp, sfs_inode)->dirty = 1;
sfs->super_dirty = 1;
// if ((ret = sfs_bmap_load_nolock(sfs, sin, slot, &ino)) != 0) {
// return ret;
// }
// assert(sfs_block_inuse(sfs, ino));
// kprintf("ino is %d\n", ino);
// kprintf("empty slot is %d\n", empty_slot);
// kprintf("father ino is %d\n", sin->ino);
*node_store = node_tmp;
}
unlock_sfs_fs(sfs);
// sfs_create_inode(sfs, struct sfs_disk_inode *din, uint32_t ino, struct inode **node_store)
return 0;
}