static int
sfs_reclaim(struct inode *node) {
struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
struct sfs_inode *sin = vop_info(node, sfs_inode);
lock_sfs_fs(sfs);
int ret = -E_BUSY;
assert(sin->reclaim_count > 0);
if ((-- sin->reclaim_count) != 0) {
goto failed_unlock;
}
assert(inode_ref_count(node) == 0 && inode_open_count(node) == 0);
if (sin->din->nlinks == 0) {
uint32_t nblks;
for (nblks = sin->din->blocks; nblks != 0; nblks --) {
sfs_bmap_truncate_nolock(sfs, sin);
}
}
else if (sin->dirty) {
if ((ret = vop_fsync(node)) != 0) {
goto failed_unlock;
}
}
sfs_remove_links(sin);
unlock_sfs_fs(sfs);
if (sin->din->nlinks == 0) {
sfs_block_free(sfs, sin->ino);
uint32_t ent;
if ((ent = sin->din->indirect) != 0) {
sfs_block_free(sfs, ent);
}
if ((ent = sin->din->db_indirect) != 0) {
int i;
for (i = 0; i < SFS_BLK_NENTRY; i ++) {
sfs_bmap_free_sub_nolock(sfs, ent, i);
}
sfs_block_free(sfs, ent);
}
}
kfree(sin->din);
vop_kill(node);
return 0;
failed_unlock:
unlock_sfs_fs(sfs);
return ret;
}
// 同步文件块
static int
sfs_sync(struct fs *fs) {
struct sfs_fs *sfs = fsop_info(fs, sfs);
lock_sfs_fs(sfs); // 应该是用信号量锁定这个玩意
{
list_entry_t *list = &(sfs->inode_list), *le = list;
while ((le = list_next(le)) != list) {
struct sfs_inode *sin = le2sin(le, inode_link);
vop_fsync(info2node(sin, sfs_inode));
}
}
unlock_sfs_fs(sfs);
int ret;
if (sfs->super_dirty) {
sfs->super_dirty = 0;
if ((ret = sfs_sync_super(sfs)) != 0) {
sfs->super_dirty = 1;
return ret;
}
if ((ret = sfs_sync_freemap(sfs)) != 0) {
sfs->super_dirty = 1;
return ret;
}
}
return 0;
}
static int
sfs_dirent_create_inode(struct sfs_fs *sfs, uint16_t type, struct inode **node_store) {
struct sfs_disk_inode *din;
if ((din = kmalloc(sizeof(struct sfs_disk_inode))) == NULL) {
return -E_NO_MEM;
}
memset(din, 0, sizeof(struct sfs_disk_inode));
din->type = type;
int ret;
uint32_t ino;
if ((ret = sfs_block_alloc(sfs, &ino)) != 0) {
goto failed_cleanup_din;
}
struct inode *node;
if ((ret = sfs_create_inode(sfs, din, ino, &node)) != 0) {
goto failed_cleanup_ino;
}
lock_sfs_fs(sfs);
{
sfs_set_links(sfs, vop_info(node, sfs_inode));
}
unlock_sfs_fs(sfs);
*node_store = node;
return 0;
failed_cleanup_ino:
sfs_block_free(sfs, ino);
failed_cleanup_din:
kfree(din);
return ret;
}
static int
sfs_sync(struct fs *fs) {
struct sfs_fs *sfs = fsop_info(fs, sfs);
lock_sfs_fs(sfs);
/*
* Get the sfs_fs from the generic abstract fs.
*
* Note that the abstract struct fs, which is all the VFS
* layer knows about, is actually a member of struct sfs_fs.
* The pointer in the struct fs points back to the top of the
* struct sfs_fs - essentially the same object. This can be a
* little confusing at first.
*
* The following diagram may help:
*
* struct sfs_fs <-----------------\
* : |
* : sfs_absfs (struct fs) | <------\
* : : | |
* : : various members | |
* : : | |
* : : fs_info(__sfs_info) ---/ |
* : : ...|...
* : . VFS .
* : . layer .
* : other members .......
* :
* :
*
* This construct is repeated with inodes and devices and other
* similar things all over the place in ucore, so taking the
* time to straighten it out in your mind is worthwhile.
*/
{
list_entry_t *list = &(sfs->inode_list), *le = list;
while ((le = list_next(le)) != list) {
struct sfs_inode *sin = le2sin(le, inode_link);
vop_fsync(info2node(sin, sfs_inode));
}
}
unlock_sfs_fs(sfs);
int ret;
if (sfs->super_dirty) {
sfs->super_dirty = 0;
/* If the superblock needs to be written, write it. */
if ((ret = sfs_sync_super(sfs)) != 0) {
sfs->super_dirty = 1;
return ret;
}
/* If the free block map needs to be written, write it. */
if ((ret = sfs_sync_freemap(sfs)) != 0) {
sfs->super_dirty = 1;
return ret;
}
}
return 0;
}
int
sfs_load_inode(struct sfs_fs *sfs, struct inode **node_store, uint32_t ino) {
// while (1);
lock_sfs_fs(sfs);
struct inode *node;
if ((node = lookup_sfs_nolock(sfs, ino)) != NULL) {
goto out_unlock;
}
int ret = -E_NO_MEM;
struct sfs_disk_inode *din;
if ((din = kmalloc(sizeof(struct sfs_disk_inode))) == NULL) {
goto failed_unlock;
}
// kprintf("in %s: ino is %d\n", __func__, ino);
// while (1);
// kprintf("%s\n", __func__);
assert(sfs_block_inuse(sfs, ino));
if ((ret = sfs_rbuf(sfs, din, sizeof(struct sfs_disk_inode), ino, 0)) != 0) {
goto failed_cleanup_din;
}
assert(_SFS_INODE_GET_NLINKS(din) != 0);
if ((ret = sfs_create_inode(sfs, din, ino, &node)) != 0) {
goto failed_cleanup_din;
}
sfs_set_links(sfs, vop_info(node, sfs_inode));
out_unlock:
unlock_sfs_fs(sfs);
*node_store = node;
return 0;
failed_cleanup_din:
kfree(din);
failed_unlock:
unlock_sfs_fs(sfs);
return ret;
}
static int
sfs_sync(struct fs *fs) {
// debug
// int u;
// kprintf("--- %d ---\n", 1);
// for (u = _initrd_begin; u < _initrd_end; ++u) {
// kprintf("%02x ", *((char *)u));
// }
// kprintf("\n");
struct sfs_fs *sfs = fsop_info(fs, sfs);
lock_sfs_fs(sfs);
{
list_entry_t *list = &(sfs->inode_list), *le = list;
while ((le = list_next(le)) != list) {
struct sfs_inode *sin = le2sin(le, inode_link);
vop_fsync(info2node(sin, sfs_inode));
}
}
unlock_sfs_fs(sfs);
// kprintf("--- %d ---\n", 2);
// for (u = _initrd_begin; u < _initrd_end; ++u) {
// kprintf("%02x ", *((char *)u));
// }
// kprintf("\n");
int ret;
if (sfs->super_dirty) {
sfs->super_dirty = 0;
if ((ret = sfs_sync_super(sfs)) != 0) {
sfs->super_dirty = 1;
return ret;
}
if ((ret = sfs_sync_freemap(sfs)) != 0) {
sfs->super_dirty = 1;
return ret;
}
}
// kprintf("--- %d ---\n", 3);
// for (u = _initrd_begin; u < _initrd_end; ++u) {
// kprintf("%02x ", *((char *)u));
// }
// kprintf("\n");
swapper_all_block_sync();
return 0;
}
/*
* sfs_reclaim - Free all resources inode occupied . Called when inode is no longer in use.
*/
static int
sfs_reclaim(struct inode *node) {
struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
struct sfs_inode *sin = vop_info(node, sfs_inode);
int ret = -E_BUSY;
uint32_t ent;
lock_sfs_fs(sfs);
assert(sin->reclaim_count > 0);
if ((-- sin->reclaim_count) != 0 || inode_ref_count(node) != 0) {
goto failed_unlock;
}
if (sin->din->nlinks == 0) {
if ((ret = vop_truncate(node, 0)) != 0) {
goto failed_unlock;
}
}
if (sin->dirty) {
if ((ret = vop_fsync(node)) != 0) {
goto failed_unlock;
}
}
sfs_remove_links(sin);
unlock_sfs_fs(sfs);
if (sin->din->nlinks == 0) {
sfs_block_free(sfs, sin->ino);
if ((ent = sin->din->indirect) != 0) {
sfs_block_free(sfs, ent);
}
}
kfree(sin->din);
vop_kill(node);
return 0;
failed_unlock:
unlock_sfs_fs(sfs);
return ret;
}
/*
* sfs_load_inode - If the inode isn't existed, load inode related ino disk block data into a new created inode.
* If the inode is in memory alreadily, then do nothing
*/
int
sfs_load_inode(struct sfs_fs *sfs, struct inode **node_store, uint32_t ino) {
lock_sfs_fs(sfs);
struct inode *node;
if ((node = lookup_sfs_nolock(sfs, ino)) != NULL) {
goto out_unlock;
}
int ret = -E_NO_MEM;
struct sfs_disk_inode *din;
if ((din = kmalloc(sizeof(struct sfs_disk_inode))) == NULL) {
goto failed_unlock;
}
assert(sfs_block_inuse(sfs, ino));
if ((ret = sfs_rbuf(sfs, din, sizeof(struct sfs_disk_inode), ino, 0)) != 0) {
goto failed_cleanup_din;
}
assert(din->nlinks != 0);
if ((ret = sfs_create_inode(sfs, din, ino, &node)) != 0) {
goto failed_cleanup_din;
}
sfs_set_links(sfs, vop_info(node, sfs_inode));
out_unlock:
unlock_sfs_fs(sfs);
*node_store = node;
return 0;
failed_cleanup_din:
kfree(din);
failed_unlock:
unlock_sfs_fs(sfs);
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;
}