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