import ext2fs lib to prep for new e2fsprogs

1 files changed, 372 insertions, 0 deletions

diff --git a/e2fsprogs/ext2fs/irel_ma.c b/e2fsprogs/ext2fs/irel_ma.c
new file mode 100644
index 000000000..eedbe55c8
--- /dev/null
+++ b/e2fsprogs/ext2fs/irel_ma.c
@@ -0,0 +1,372 @@
+/*
+ * irel_ma.c
+ * 
+ * Copyright (C) 1996, 1997 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+#include "irel.h"
+
+static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
+			 struct ext2_inode_relocate_entry *ent);
+static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
+			 struct ext2_inode_relocate_entry *ent);
+static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
+				 struct ext2_inode_relocate_entry *ent);
+static errcode_t ima_start_iter(ext2_irel irel);
+static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
+			  struct ext2_inode_relocate_entry *ent);
+static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
+			     struct ext2_inode_reference *ref);
+static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino);
+static errcode_t ima_next_ref(ext2_irel irel, struct ext2_inode_reference *ref);
+static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new);
+static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old);
+static errcode_t ima_free(ext2_irel irel);
+
+/*
+ * This data structure stores the array of inode references; there is
+ * a structure for each inode.
+ */
+struct inode_reference_entry {
+	__u16 num;
+	struct ext2_inode_reference *refs;
+};
+
+struct irel_ma {
+	__u32 magic;
+	ext2_ino_t max_inode;
+	ext2_ino_t ref_current;
+	int   ref_iter;
+	ext2_ino_t	*orig_map;
+	struct ext2_inode_relocate_entry *entries;
+	struct inode_reference_entry *ref_entries;
+};
+
+errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode,
+				      ext2_irel *new_irel)
+{
+	ext2_irel		irel = 0;
+	errcode_t	retval;
+	struct irel_ma 	*ma = 0;
+	size_t		size;
+
+	*new_irel = 0;
+
+	/*
+	 * Allocate memory structures
+	 */
+	retval = ext2fs_get_mem(sizeof(struct ext2_inode_relocation_table),
+				&irel);
+	if (retval)
+		goto errout;
+	memset(irel, 0, sizeof(struct ext2_inode_relocation_table));
+	
+	retval = ext2fs_get_mem(strlen(name)+1, &irel->name);
+	if (retval)
+		goto errout;
+	strcpy(irel->name, name);
+	
+	retval = ext2fs_get_mem(sizeof(struct irel_ma), &ma);
+	if (retval)
+		goto errout;
+	memset(ma, 0, sizeof(struct irel_ma));
+	irel->priv_data = ma;
+	
+	size = (size_t) (sizeof(ext2_ino_t) * (max_inode+1));
+	retval = ext2fs_get_mem(size, &ma->orig_map);
+	if (retval)
+		goto errout;
+	memset(ma->orig_map, 0, size);
+
+	size = (size_t) (sizeof(struct ext2_inode_relocate_entry) *
+			 (max_inode+1));
+	retval = ext2fs_get_mem(size, &ma->entries);
+	if (retval)
+		goto errout;
+	memset(ma->entries, 0, size);
+
+	size = (size_t) (sizeof(struct inode_reference_entry) *
+			 (max_inode+1));
+	retval = ext2fs_get_mem(size, &ma->ref_entries);
+	if (retval)
+		goto errout;
+	memset(ma->ref_entries, 0, size);
+	ma->max_inode = max_inode;
+
+	/*
+	 * Fill in the irel data structure
+	 */
+	irel->put = ima_put;
+	irel->get = ima_get;
+	irel->get_by_orig = ima_get_by_orig;
+	irel->start_iter = ima_start_iter;
+	irel->next = ima_next;
+	irel->add_ref = ima_add_ref;
+	irel->start_iter_ref = ima_start_iter_ref;
+	irel->next_ref = ima_next_ref;
+	irel->move = ima_move;
+	irel->delete = ima_delete;
+	irel->free = ima_free;
+	
+	*new_irel = irel;
+	return 0;
+
+errout:
+	ima_free(irel);
+	return retval;
+}
+
+static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
+			struct ext2_inode_relocate_entry *ent)
+{
+	struct inode_reference_entry	*ref_ent;
+	struct irel_ma 			*ma;
+	errcode_t			retval;
+	size_t				size, old_size;
+
+	ma = irel->priv_data;
+	if (old > ma->max_inode)
+		return EXT2_ET_INVALID_ARGUMENT;
+
+	/*
+	 * Force the orig field to the correct value; the application
+	 * program shouldn't be messing with this field.
+	 */
+	if (ma->entries[(unsigned) old].new == 0)
+		ent->orig = old;
+	else
+		ent->orig = ma->entries[(unsigned) old].orig;
+	
+	/*
+	 * If max_refs has changed, reallocate the refs array
+	 */
+	ref_ent = ma->ref_entries + (unsigned) old;
+	if (ref_ent->refs && ent->max_refs !=
+	    ma->entries[(unsigned) old].max_refs) {
+		size = (sizeof(struct ext2_inode_reference) * ent->max_refs);
+		old_size = (sizeof(struct ext2_inode_reference) *
+			    ma->entries[(unsigned) old].max_refs);
+		retval = ext2fs_resize_mem(old_size, size, &ref_ent->refs);
+		if (retval)
+			return retval;
+	}
+
+	ma->entries[(unsigned) old] = *ent;
+	ma->orig_map[(unsigned) ent->orig] = old;
+	return 0;
+}
+
+static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
+			struct ext2_inode_relocate_entry *ent)
+{
+	struct irel_ma 	*ma;
+
+	ma = irel->priv_data;
+	if (old > ma->max_inode)
+		return EXT2_ET_INVALID_ARGUMENT;
+	if (ma->entries[(unsigned) old].new == 0)
+		return ENOENT;
+	*ent = ma->entries[(unsigned) old];
+	return 0;
+}
+
+static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
+			struct ext2_inode_relocate_entry *ent)
+{
+	struct irel_ma 	*ma;
+	ext2_ino_t	ino;
+
+	ma = irel->priv_data;
+	if (orig > ma->max_inode)
+		return EXT2_ET_INVALID_ARGUMENT;
+	ino = ma->orig_map[(unsigned) orig];
+	if (ino == 0)
+		return ENOENT;
+	*old = ino;
+	*ent = ma->entries[(unsigned) ino];
+	return 0;
+}
+
+static errcode_t ima_start_iter(ext2_irel irel)
+{
+	irel->current = 0;
+	return 0;
+}
+
+static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
+			 struct ext2_inode_relocate_entry *ent)
+{
+	struct irel_ma 	*ma;
+
+	ma = irel->priv_data;
+	while (++irel->current < ma->max_inode) {
+		if (ma->entries[(unsigned) irel->current].new == 0)
+			continue;
+		*old = irel->current;
+		*ent = ma->entries[(unsigned) irel->current];
+		return 0;
+	}
+	*old = 0;
+	return 0;
+}
+
+static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
+			     struct ext2_inode_reference *ref)
+{
+	struct irel_ma 	*ma;
+	size_t		size;
+	struct inode_reference_entry *ref_ent;
+	struct ext2_inode_relocate_entry *ent;
+	errcode_t		retval;
+
+	ma = irel->priv_data;
+	if (ino > ma->max_inode)
+		return EXT2_ET_INVALID_ARGUMENT;
+
+	ref_ent = ma->ref_entries + (unsigned) ino;
+	ent = ma->entries + (unsigned) ino;
+	
+	/*
+	 * If the inode reference array doesn't exist, create it.
+	 */
+	if (ref_ent->refs == 0) {
+		size = (size_t) ((sizeof(struct ext2_inode_reference) * 
+				  ent->max_refs));
+		retval = ext2fs_get_mem(size, &ref_ent->refs);
+		if (retval)
+			return retval;
+		memset(ref_ent->refs, 0, size);
+		ref_ent->num = 0;
+	}
+
+	if (ref_ent->num >= ent->max_refs)
+		return EXT2_ET_TOO_MANY_REFS;
+
+	ref_ent->refs[(unsigned) ref_ent->num++] = *ref;
+	return 0;
+}
+
+static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino)
+{
+	struct irel_ma 	*ma;
+
+	ma = irel->priv_data;
+	if (ino > ma->max_inode)
+		return EXT2_ET_INVALID_ARGUMENT;
+	if (ma->entries[(unsigned) ino].new == 0)
+		return ENOENT;
+	ma->ref_current = ino;
+	ma->ref_iter = 0;
+	return 0;
+}
+
+static errcode_t ima_next_ref(ext2_irel irel,
+			      struct ext2_inode_reference *ref)
+{
+	struct irel_ma 	*ma;
+	struct inode_reference_entry *ref_ent;
+
+	ma = irel->priv_data;
+	
+	ref_ent = ma->ref_entries + ma->ref_current;
+
+	if ((ref_ent->refs == NULL) ||
+	    (ma->ref_iter >= ref_ent->num)) {
+		ref->block = 0;
+		ref->offset = 0;
+		return 0;
+	}
+	*ref = ref_ent->refs[ma->ref_iter++];
+	return 0;
+}
+
+
+static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new)
+{
+	struct irel_ma 	*ma;
+
+	ma = irel->priv_data;
+	if ((old > ma->max_inode) || (new > ma->max_inode))
+		return EXT2_ET_INVALID_ARGUMENT;
+	if (ma->entries[(unsigned) old].new == 0)
+		return ENOENT;
+	
+	ma->entries[(unsigned) new] = ma->entries[(unsigned) old];
+	if (ma->ref_entries[(unsigned) new].refs)
+		ext2fs_free_mem(&ma->ref_entries[(unsigned) new].refs);
+	ma->ref_entries[(unsigned) new] = ma->ref_entries[(unsigned) old];
+	
+	ma->entries[(unsigned) old].new = 0;
+	ma->ref_entries[(unsigned) old].num = 0;
+	ma->ref_entries[(unsigned) old].refs = 0;
+
+	ma->orig_map[ma->entries[new].orig] = new;
+	return 0;
+}
+
+static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old)
+{
+	struct irel_ma 	*ma;
+
+	ma = irel->priv_data;
+	if (old > ma->max_inode)
+		return EXT2_ET_INVALID_ARGUMENT;
+	if (ma->entries[(unsigned) old].new == 0)
+		return ENOENT;
+	
+	ma->entries[old].new = 0;
+	if (ma->ref_entries[(unsigned) old].refs)
+		ext2fs_free_mem(&ma->ref_entries[(unsigned) old].refs);
+	ma->orig_map[ma->entries[(unsigned) old].orig] = 0;
+	
+	ma->ref_entries[(unsigned) old].num = 0;
+	ma->ref_entries[(unsigned) old].refs = 0;
+	return 0;
+}
+
+static errcode_t ima_free(ext2_irel irel)
+{
+	struct irel_ma 	*ma;
+	ext2_ino_t	ino;
+
+	if (!irel)
+		return 0;
+
+	ma = irel->priv_data;
+
+	if (ma) {
+		if (ma->orig_map)
+			ext2fs_free_mem(&ma->orig_map);
+		if (ma->entries)
+			ext2fs_free_mem(&ma->entries);
+		if (ma->ref_entries) {
+			for (ino = 0; ino <= ma->max_inode; ino++) {
+				if (ma->ref_entries[(unsigned) ino].refs)
+					ext2fs_free_mem(&ma->ref_entries[(unsigned) ino].refs);
+			}
+			ext2fs_free_mem(&ma->ref_entries);
+		}
+		ext2fs_free_mem(&ma);
+	}
+	if (irel->name)
+		ext2fs_free_mem(&irel->name);
+	ext2fs_free_mem(&irel);
+	return 0;
+}