Imported reiserfsprogs-3.6.20

include/reiserfs/direntry.h

@@ -0,0 +1,158 @@
+/*
+ *  Copyright 2000-2004 by Hans Reiser, licensing governed by 
+ *  reiserfsprogs/README
+ */
+
+#ifndef REISERFS_DIRENTRY_H
+#define REISERFS_DIRENTRY_H
+
+#include "reiserfs/types.h"
+
+/***************************************************************************/
+/*                      DIRECTORY STRUCTURE                                */
+/***************************************************************************/
+/* 
+   Picture represents the structure of directory items
+   ________________________________________________
+   |  Array of     |   |     |        |       |   |
+   | directory     |N-1| N-2 | ....   |   1st |0th|
+   | entry headers |   |     |        |       |   |
+   |_______________|___|_____|________|_______|___|
+                    <----   directory entries         ------>
+
+ First directory item has k_offset component 1. We store "." and ".."
+ in one item, always, we never split "." and ".." into differing
+ items.  This makes, among other things, the code for removing
+ directories simpler. */
+
+/* Each directory entry has its header. This header has deh_dir_id and
+   deh_objectid fields, those are key of object, entry points to */
+
+/* NOT IMPLEMENTED:   
+   Directory will someday contain stat data of object */
+struct reiserfs_de_head
+{
+    __u32 deh2_offset;  /* third component of the directory entry key */
+    __u32 deh2_dir_id;  /* objectid of the parent directory of the object,
+			   that is referenced by directory entry */
+    __u32 deh2_objectid;/* objectid of the object, that is referenced by
+			   directory entry */
+    __u16 deh2_location;/* offset of name in the whole item */
+    __u16 deh2_state;   /* whether 1) entry contains stat data (for future),
+			   and 2) whether entry is hidden (unlinked) */
+} __attribute__ ((__packed__));
+
+typedef struct reiserfs_de_head reiserfs_deh_t;
+
+#define REISERFS_DEH_SIZE sizeof(reiserfs_deh_t)
+
+/* set/get fields of dir entry head these defines */
+#define reiserfs_deh_get_off(deh)	get_le32 (deh, deh2_offset)
+#define reiserfs_deh_set_off(deh,val)	set_le32 (deh, deh2_offset, val)
+
+#define reiserfs_deh_get_did(deh)	get_le32 (deh, deh2_dir_id)
+#define reiserfs_deh_set_did(deh,val)	set_le32 (deh, deh2_dir_id, val)
+
+#define reiserfs_deh_get_obid(deh)	get_le32 (deh, deh2_objectid)
+#define reiserfs_deh_set_obid(deh,val)	set_le32 (deh, deh2_objectid, val)
+
+#define reiserfs_deh_get_loc(deh)	get_le16 (deh, deh2_location)
+#define reiserfs_deh_set_loc(deh,val)	set_le16 (deh, deh2_location, val)
+
+#define reiserfs_deh_get_state(deh)	get_le16 (deh, deh2_state)
+#define reiserfs_deh_set_state(deh,val)	set_le16 (deh, deh2_state, val)
+
+#define reiserfs_deh_name(deh, pos)				\
+	((char *)(deh - pos) + reiserfs_deh_get_loc(deh))
+
+/* empty directory contains two entries "." and ".." and their headers */
+#define REISERFS_DIR_MIN					\
+	(REISERFS_DEH_SIZE * 2 +				\
+	 MISC_ROUND_UP (strlen (".")) +				\
+	 MISC_ROUND_UP (strlen ("..")))
+
+/* old format directories have this size when empty */
+#define REISERFS_DIR_MIN_V1 (REISERFS_DEH_SIZE * 2 + 3)
+
+#define DEH_Statdata 0			/* not used now */
+#define DEH_Visible2 2
+
+#define DEH_Bad_offset 4 /* fsck marks entries to be deleted with this flag */
+#define DEH_Bad_location 5
+
+#define reiserfs_deh_state_bit(deh,bit)				\
+	(reiserfs_deh_get_state (deh) & (1 << bit))
+
+#define reiserfs_deh_state_set_bit(deh,bit)			\
+{								\
+	__u16 state;						\
+	state = reiserfs_deh_get_state (deh);			\
+	state |= (1 << bit);					\
+	reiserfs_deh_set_state(deh, state);			\
+}
+
+#define reiserfs_deh_state_clear_bit(deh,bit)			\
+{								\
+	__u16 state;						\
+	state = reiserfs_deh_get_state (deh);			\
+	state &= ~(1 << bit);					\
+	reiserfs_deh_set_state(deh, state);			\
+}
+
+/* Bad means "hashed unproperly or/and invalid location" */
+#define reiserfs_deh_locbad(deh)				\
+	reiserfs_deh_state_bit (deh, DEH_Bad_location)
+#define reiserfs_deh_set_locbad(deh)				\
+	reiserfs_deh_state_set_bit (deh, DEH_Bad_location)
+#define reiserfs_deh_set_locok(deh)				\
+	reiserfs_deh_state_clear_bit (deh, DEH_Bad_location)
+
+#define reiserfs_deh_offbad(deh)				\
+	reiserfs_deh_state_bit (deh, DEH_Bad_offset)
+#define reiserfs_deh_set_offbad(deh)				\
+	reiserfs_deh_state_set_bit (deh, DEH_Bad_offset)
+
+#define reiserfs_deh_bad(deh)					\
+	(reiserfs_deh_locbad(deh) || reiserfs_deh_offbad(deh))
+
+
+/* for directories st_blocks is number of 512 byte units which fit into dir
+   size round up to blocksize */
+#define REISERFS_DIR_BLOCKS(size) ((size + 511) / 512)
+
+/* array of the entry headers */
+#define reiserfs_deh(bh,ih) ((reiserfs_deh_t *)(reiserfs_item_by_ih(bh,ih)))
+
+#define REISERFS_NAME_MAX	256
+/* #define REISERFS_NAME_MAX(block_size)				\
+	(block_size - REISERFS_NODEH_SIZE -			\
+	 REISERFS_IH_SIZE - REISERFS_DEH_SIZE)
+*/
+
+/* -REISERFS_SD_SIZE when entry will contain stat data */
+
+extern int reiserfs_direntry_loc_check (reiserfs_deh_t * deh, 
+					reiserfs_ih_t * ih, 
+					int first);
+
+extern int reiserfs_direntry_entry_len (reiserfs_ih_t * ih, 
+					reiserfs_deh_t * deh,
+					int pos_in_item);
+
+extern int reiserfs_direntry_name_len (reiserfs_ih_t * ih,
+				       reiserfs_deh_t * deh, 
+				       int pos_in_item);
+
+extern int reiserfs_direntry_entry_estimate (char * name, 
+					     int key_format);
+
+extern int reiserfs_direntry_check (reiserfs_filsys_t * fs, 
+				    reiserfs_ih_t * ih, 
+				    char * item, 
+				    int bad_dir);
+
+extern void reiserfs_direntry_print (FILE * fp, 
+				     reiserfs_filsys_t * fs,
+				     reiserfs_bh_t * bh, 
+				     reiserfs_ih_t * ih);
+#endif