minix3/lib/libvtreefs/inode.h

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2020-02-21 00:59:27 +05:30
#ifndef _VTREEFS_INODE_H
#define _VTREEFS_INODE_H
/* The inodes that are active, form a fully connected tree. Each node except
* the root node has a parent and a tail queue of children, where each child
* inode points to the "next" and "previous" inode with a common parent.
*
* Each inode that has a parent (i.e. active and not the root), is part of a
* <parent,name> -> inode hashtable, and if it has an index into the parent,
* is part of a <parent,index> -> inode hashtable.
*
* Inodes that are not active, are either deleted or free. A deleted inode is
* in use as long as it still has a nonzero reference count, even though it is
* no longer part of the tree. Inodes that are free, are part of the list of
* unused inodes.
*/
struct inode {
/* Inode metadata */
struct inode_stat i_stat; /* POSIX attributes */
char i_name[PNAME_MAX + 1]; /* name of the inode in the parent */
int i_count; /* reference count */
index_t i_index; /* index number in parent / NO_INDEX */
int i_indexed; /* number of indexed entries */
cbdata_t i_cbdata; /* callback data */
unsigned short i_flags; /* I_DELETED or 0 */
/* Tree structure */
struct inode *i_parent; /* parent of the node */
TAILQ_ENTRY(inode) i_siblings; /* hash list for parent's children */
TAILQ_HEAD(i_child, inode) i_children; /* parent's children */
/* Hash/free structure */
LIST_ENTRY(inode) i_hname; /* hash list for name hash table */
LIST_ENTRY(inode) i_hindex; /* hash list for index hash table */
TAILQ_ENTRY(inode) i_unused; /* list of unused nodes */
};
#define I_DELETED 0x1 /* the inode is scheduled for deletion */
#endif /* _VTREEFS_INODE_H */