1 files changed, 744 insertions, 0 deletions

diff --git a/fs/reiserfs/item_ops.c b/fs/reiserfs/item_ops.c
new file mode 100644
index 000000000..3a5a752d9
--- /dev/null
+++ b/fs/reiserfs/item_ops.c
@@ -0,0 +1,744 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/time.h>
+#include "reiserfs.h"
+
+/*
+ * this contains item handlers for old item types: sd, direct,
+ * indirect, directory
+ */
+
+/*
+ * and where are the comments? how about saying where we can find an
+ * explanation of each item handler method? -Hans
+ */
+
+/* stat data functions */
+static int sd_bytes_number(struct item_head *ih, int block_size)
+{
+	return 0;
+}
+
+static void sd_decrement_key(struct cpu_key *key)
+{
+	key->on_disk_key.k_objectid--;
+	set_cpu_key_k_type(key, TYPE_ANY);
+	set_cpu_key_k_offset(key, (loff_t)(~0ULL >> 1));
+}
+
+static int sd_is_left_mergeable(struct reiserfs_key *key, unsigned long bsize)
+{
+	return 0;
+}
+
+static void sd_print_item(struct item_head *ih, char *item)
+{
+	printk("\tmode | size | nlinks | first direct | mtime\n");
+	if (stat_data_v1(ih)) {
+		struct stat_data_v1 *sd = (struct stat_data_v1 *)item;
+
+		printk("\t0%-6o | %6u | %2u | %d | %u\n", sd_v1_mode(sd),
+		       sd_v1_size(sd), sd_v1_nlink(sd),
+		       sd_v1_first_direct_byte(sd),
+		       sd_v1_mtime(sd));
+	} else {
+		struct stat_data *sd = (struct stat_data *)item;
+
+		printk("\t0%-6o | %6llu | %2u | %d | %u\n", sd_v2_mode(sd),
+		       (unsigned long long)sd_v2_size(sd), sd_v2_nlink(sd),
+		       sd_v2_rdev(sd), sd_v2_mtime(sd));
+	}
+}
+
+static void sd_check_item(struct item_head *ih, char *item)
+{
+	/* unused */
+}
+
+static int sd_create_vi(struct virtual_node *vn,
+			struct virtual_item *vi,
+			int is_affected, int insert_size)
+{
+	vi->vi_index = TYPE_STAT_DATA;
+	return 0;
+}
+
+static int sd_check_left(struct virtual_item *vi, int free,
+			 int start_skip, int end_skip)
+{
+	BUG_ON(start_skip || end_skip);
+	return -1;
+}
+
+static int sd_check_right(struct virtual_item *vi, int free)
+{
+	return -1;
+}
+
+static int sd_part_size(struct virtual_item *vi, int first, int count)
+{
+	BUG_ON(count);
+	return 0;
+}
+
+static int sd_unit_num(struct virtual_item *vi)
+{
+	return vi->vi_item_len - IH_SIZE;
+}
+
+static void sd_print_vi(struct virtual_item *vi)
+{
+	reiserfs_warning(NULL, "reiserfs-16100",
+			 "STATDATA, index %d, type 0x%x, %h",
+			 vi->vi_index, vi->vi_type, vi->vi_ih);
+}
+
+static struct item_operations stat_data_ops = {
+	.bytes_number = sd_bytes_number,
+	.decrement_key = sd_decrement_key,
+	.is_left_mergeable = sd_is_left_mergeable,
+	.print_item = sd_print_item,
+	.check_item = sd_check_item,
+
+	.create_vi = sd_create_vi,
+	.check_left = sd_check_left,
+	.check_right = sd_check_right,
+	.part_size = sd_part_size,
+	.unit_num = sd_unit_num,
+	.print_vi = sd_print_vi
+};
+
+/* direct item functions */
+static int direct_bytes_number(struct item_head *ih, int block_size)
+{
+	return ih_item_len(ih);
+}
+
+/* FIXME: this should probably switch to indirect as well */
+static void direct_decrement_key(struct cpu_key *key)
+{
+	cpu_key_k_offset_dec(key);
+	if (cpu_key_k_offset(key) == 0)
+		set_cpu_key_k_type(key, TYPE_STAT_DATA);
+}
+
+static int direct_is_left_mergeable(struct reiserfs_key *key,
+				    unsigned long bsize)
+{
+	int version = le_key_version(key);
+	return ((le_key_k_offset(version, key) & (bsize - 1)) != 1);
+}
+
+static void direct_print_item(struct item_head *ih, char *item)
+{
+	int j = 0;
+
+/*    return; */
+	printk("\"");
+	while (j < ih_item_len(ih))
+		printk("%c", item[j++]);
+	printk("\"\n");
+}
+
+static void direct_check_item(struct item_head *ih, char *item)
+{
+	/* unused */
+}
+
+static int direct_create_vi(struct virtual_node *vn,
+			    struct virtual_item *vi,
+			    int is_affected, int insert_size)
+{
+	vi->vi_index = TYPE_DIRECT;
+	return 0;
+}
+
+static int direct_check_left(struct virtual_item *vi, int free,
+			     int start_skip, int end_skip)
+{
+	int bytes;
+
+	bytes = free - free % 8;
+	return bytes ? : -1;
+}
+
+static int direct_check_right(struct virtual_item *vi, int free)
+{
+	return direct_check_left(vi, free, 0, 0);
+}
+
+static int direct_part_size(struct virtual_item *vi, int first, int count)
+{
+	return count;
+}
+
+static int direct_unit_num(struct virtual_item *vi)
+{
+	return vi->vi_item_len - IH_SIZE;
+}
+
+static void direct_print_vi(struct virtual_item *vi)
+{
+	reiserfs_warning(NULL, "reiserfs-16101",
+			 "DIRECT, index %d, type 0x%x, %h",
+			 vi->vi_index, vi->vi_type, vi->vi_ih);
+}
+
+static struct item_operations direct_ops = {
+	.bytes_number = direct_bytes_number,
+	.decrement_key = direct_decrement_key,
+	.is_left_mergeable = direct_is_left_mergeable,
+	.print_item = direct_print_item,
+	.check_item = direct_check_item,
+
+	.create_vi = direct_create_vi,
+	.check_left = direct_check_left,
+	.check_right = direct_check_right,
+	.part_size = direct_part_size,
+	.unit_num = direct_unit_num,
+	.print_vi = direct_print_vi
+};
+
+/* indirect item functions */
+static int indirect_bytes_number(struct item_head *ih, int block_size)
+{
+	return ih_item_len(ih) / UNFM_P_SIZE * block_size;
+}
+
+/* decrease offset, if it becomes 0, change type to stat data */
+static void indirect_decrement_key(struct cpu_key *key)
+{
+	cpu_key_k_offset_dec(key);
+	if (cpu_key_k_offset(key) == 0)
+		set_cpu_key_k_type(key, TYPE_STAT_DATA);
+}
+
+/* if it is not first item of the body, then it is mergeable */
+static int indirect_is_left_mergeable(struct reiserfs_key *key,
+				      unsigned long bsize)
+{
+	int version = le_key_version(key);
+	return (le_key_k_offset(version, key) != 1);
+}
+
+/* printing of indirect item */
+static void start_new_sequence(__u32 * start, int *len, __u32 new)
+{
+	*start = new;
+	*len = 1;
+}
+
+static int sequence_finished(__u32 start, int *len, __u32 new)
+{
+	if (start == INT_MAX)
+		return 1;
+
+	if (start == 0 && new == 0) {
+		(*len)++;
+		return 0;
+	}
+	if (start != 0 && (start + *len) == new) {
+		(*len)++;
+		return 0;
+	}
+	return 1;
+}
+
+static void print_sequence(__u32 start, int len)
+{
+	if (start == INT_MAX)
+		return;
+
+	if (len == 1)
+		printk(" %d", start);
+	else
+		printk(" %d(%d)", start, len);
+}
+
+static void indirect_print_item(struct item_head *ih, char *item)
+{
+	int j;
+	__le32 *unp;
+	__u32 prev = INT_MAX;
+	int num = 0;
+
+	unp = (__le32 *) item;
+
+	if (ih_item_len(ih) % UNFM_P_SIZE)
+		reiserfs_warning(NULL, "reiserfs-16102", "invalid item len");
+
+	printk("%d pointers\n[ ", (int)I_UNFM_NUM(ih));
+	for (j = 0; j < I_UNFM_NUM(ih); j++) {
+		if (sequence_finished(prev, &num, get_block_num(unp, j))) {
+			print_sequence(prev, num);
+			start_new_sequence(&prev, &num, get_block_num(unp, j));
+		}
+	}
+	print_sequence(prev, num);
+	printk("]\n");
+}
+
+static void indirect_check_item(struct item_head *ih, char *item)
+{
+	/* unused */
+}
+
+static int indirect_create_vi(struct virtual_node *vn,
+			      struct virtual_item *vi,
+			      int is_affected, int insert_size)
+{
+	vi->vi_index = TYPE_INDIRECT;
+	return 0;
+}
+
+static int indirect_check_left(struct virtual_item *vi, int free,
+			       int start_skip, int end_skip)
+{
+	int bytes;
+
+	bytes = free - free % UNFM_P_SIZE;
+	return bytes ? : -1;
+}
+
+static int indirect_check_right(struct virtual_item *vi, int free)
+{
+	return indirect_check_left(vi, free, 0, 0);
+}
+
+/*
+ * return size in bytes of 'units' units. If first == 0 - calculate
+ * from the head (left), otherwise - from tail (right)
+ */
+static int indirect_part_size(struct virtual_item *vi, int first, int units)
+{
+	/* unit of indirect item is byte (yet) */
+	return units;
+}
+
+static int indirect_unit_num(struct virtual_item *vi)
+{
+	/* unit of indirect item is byte (yet) */
+	return vi->vi_item_len - IH_SIZE;
+}
+
+static void indirect_print_vi(struct virtual_item *vi)
+{
+	reiserfs_warning(NULL, "reiserfs-16103",
+			 "INDIRECT, index %d, type 0x%x, %h",
+			 vi->vi_index, vi->vi_type, vi->vi_ih);
+}
+
+static struct item_operations indirect_ops = {
+	.bytes_number = indirect_bytes_number,
+	.decrement_key = indirect_decrement_key,
+	.is_left_mergeable = indirect_is_left_mergeable,
+	.print_item = indirect_print_item,
+	.check_item = indirect_check_item,
+
+	.create_vi = indirect_create_vi,
+	.check_left = indirect_check_left,
+	.check_right = indirect_check_right,
+	.part_size = indirect_part_size,
+	.unit_num = indirect_unit_num,
+	.print_vi = indirect_print_vi
+};
+
+/* direntry functions */
+static int direntry_bytes_number(struct item_head *ih, int block_size)
+{
+	reiserfs_warning(NULL, "vs-16090",
+			 "bytes number is asked for direntry");
+	return 0;
+}
+
+static void direntry_decrement_key(struct cpu_key *key)
+{
+	cpu_key_k_offset_dec(key);
+	if (cpu_key_k_offset(key) == 0)
+		set_cpu_key_k_type(key, TYPE_STAT_DATA);
+}
+
+static int direntry_is_left_mergeable(struct reiserfs_key *key,
+				      unsigned long bsize)
+{
+	if (le32_to_cpu(key->u.k_offset_v1.k_offset) == DOT_OFFSET)
+		return 0;
+	return 1;
+
+}
+
+static void direntry_print_item(struct item_head *ih, char *item)
+{
+	int i;
+	int namelen;
+	struct reiserfs_de_head *deh;
+	char *name;
+	static char namebuf[80];
+
+	printk("\n # %-15s%-30s%-15s%-15s%-15s\n", "Name",
+	       "Key of pointed object", "Hash", "Gen number", "Status");
+
+	deh = (struct reiserfs_de_head *)item;
+
+	for (i = 0; i < ih_entry_count(ih); i++, deh++) {
+		namelen =
+		    (i ? (deh_location(deh - 1)) : ih_item_len(ih)) -
+		    deh_location(deh);
+		name = item + deh_location(deh);
+		if (name[namelen - 1] == 0)
+			namelen = strlen(name);
+		namebuf[0] = '"';
+		if (namelen > sizeof(namebuf) - 3) {
+			strncpy(namebuf + 1, name, sizeof(namebuf) - 3);
+			namebuf[sizeof(namebuf) - 2] = '"';
+			namebuf[sizeof(namebuf) - 1] = 0;
+		} else {
+			memcpy(namebuf + 1, name, namelen);
+			namebuf[namelen + 1] = '"';
+			namebuf[namelen + 2] = 0;
+		}
+
+		printk("%d:  %-15s%-15d%-15d%-15lld%-15lld(%s)\n",
+		       i, namebuf,
+		       deh_dir_id(deh), deh_objectid(deh),
+		       GET_HASH_VALUE(deh_offset(deh)),
+		       GET_GENERATION_NUMBER((deh_offset(deh))),
+		       (de_hidden(deh)) ? "HIDDEN" : "VISIBLE");
+	}
+}
+
+static void direntry_check_item(struct item_head *ih, char *item)
+{
+	int i;
+	struct reiserfs_de_head *deh;
+
+	/* unused */
+	deh = (struct reiserfs_de_head *)item;
+	for (i = 0; i < ih_entry_count(ih); i++, deh++) {
+		;
+	}
+}
+
+#define DIRENTRY_VI_FIRST_DIRENTRY_ITEM 1
+
+/*
+ * function returns old entry number in directory item in real node
+ * using new entry number in virtual item in virtual node
+ */
+static inline int old_entry_num(int is_affected, int virtual_entry_num,
+				int pos_in_item, int mode)
+{
+	if (mode == M_INSERT || mode == M_DELETE)
+		return virtual_entry_num;
+
+	if (!is_affected)
+		/* cut or paste is applied to another item */
+		return virtual_entry_num;
+
+	if (virtual_entry_num < pos_in_item)
+		return virtual_entry_num;
+
+	if (mode == M_CUT)
+		return virtual_entry_num + 1;
+
+	RFALSE(mode != M_PASTE || virtual_entry_num == 0,
+	       "vs-8015: old_entry_num: mode must be M_PASTE (mode = \'%c\'",
+	       mode);
+
+	return virtual_entry_num - 1;
+}
+
+/*
+ * Create an array of sizes of directory entries for virtual
+ * item. Return space used by an item. FIXME: no control over
+ * consuming of space used by this item handler
+ */
+static int direntry_create_vi(struct virtual_node *vn,
+			      struct virtual_item *vi,
+			      int is_affected, int insert_size)
+{
+	struct direntry_uarea *dir_u = vi->vi_uarea;
+	int i, j;
+	int size = sizeof(struct direntry_uarea);
+	struct reiserfs_de_head *deh;
+
+	vi->vi_index = TYPE_DIRENTRY;
+
+	BUG_ON(!(vi->vi_ih) || !vi->vi_item);
+
+	dir_u->flags = 0;
+	if (le_ih_k_offset(vi->vi_ih) == DOT_OFFSET)
+		dir_u->flags |= DIRENTRY_VI_FIRST_DIRENTRY_ITEM;
+
+	deh = (struct reiserfs_de_head *)(vi->vi_item);
+
+	/* virtual directory item have this amount of entry after */
+	dir_u->entry_count = ih_entry_count(vi->vi_ih) +
+	    ((is_affected) ? ((vn->vn_mode == M_CUT) ? -1 :
+			      (vn->vn_mode == M_PASTE ? 1 : 0)) : 0);
+
+	for (i = 0; i < dir_u->entry_count; i++) {
+		j = old_entry_num(is_affected, i, vn->vn_pos_in_item,
+				  vn->vn_mode);
+		dir_u->entry_sizes[i] =
+		    (j ? deh_location(&deh[j - 1]) : ih_item_len(vi->vi_ih)) -
+		    deh_location(&deh[j]) + DEH_SIZE;
+	}
+
+	size += (dir_u->entry_count * sizeof(short));
+
+	/* set size of pasted entry */
+	if (is_affected && vn->vn_mode == M_PASTE)
+		dir_u->entry_sizes[vn->vn_pos_in_item] = insert_size;
+
+#ifdef CONFIG_REISERFS_CHECK
+	/* compare total size of entries with item length */
+	{
+		int k, l;
+
+		l = 0;
+		for (k = 0; k < dir_u->entry_count; k++)
+			l += dir_u->entry_sizes[k];
+
+		if (l + IH_SIZE != vi->vi_item_len +
+		    ((is_affected
+		      && (vn->vn_mode == M_PASTE
+			  || vn->vn_mode == M_CUT)) ? insert_size : 0)) {
+			reiserfs_panic(NULL, "vs-8025", "(mode==%c, "
+				       "insert_size==%d), invalid length of "
+				       "directory item",
+				       vn->vn_mode, insert_size);
+		}
+	}
+#endif
+
+	return size;
+
+}
+
+/*
+ * return number of entries which may fit into specified amount of
+ * free space, or -1 if free space is not enough even for 1 entry
+ */
+static int direntry_check_left(struct virtual_item *vi, int free,
+			       int start_skip, int end_skip)
+{
+	int i;
+	int entries = 0;
+	struct direntry_uarea *dir_u = vi->vi_uarea;
+
+	for (i = start_skip; i < dir_u->entry_count - end_skip; i++) {
+		/* i-th entry doesn't fit into the remaining free space */
+		if (dir_u->entry_sizes[i] > free)
+			break;
+
+		free -= dir_u->entry_sizes[i];
+		entries++;
+	}
+
+	if (entries == dir_u->entry_count) {
+		reiserfs_panic(NULL, "item_ops-1",
+			       "free space %d, entry_count %d", free,
+			       dir_u->entry_count);
+	}
+
+	/* "." and ".." can not be separated from each other */
+	if (start_skip == 0 && (dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM)
+	    && entries < 2)
+		entries = 0;
+
+	return entries ? : -1;
+}
+
+static int direntry_check_right(struct virtual_item *vi, int free)
+{
+	int i;
+	int entries = 0;
+	struct direntry_uarea *dir_u = vi->vi_uarea;
+
+	for (i = dir_u->entry_count - 1; i >= 0; i--) {
+		/* i-th entry doesn't fit into the remaining free space */
+		if (dir_u->entry_sizes[i] > free)
+			break;
+
+		free -= dir_u->entry_sizes[i];
+		entries++;
+	}
+	BUG_ON(entries == dir_u->entry_count);
+
+	/* "." and ".." can not be separated from each other */
+	if ((dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM)
+	    && entries > dir_u->entry_count - 2)
+		entries = dir_u->entry_count - 2;
+
+	return entries ? : -1;
+}
+
+/* sum of entry sizes between from-th and to-th entries including both edges */
+static int direntry_part_size(struct virtual_item *vi, int first, int count)
+{
+	int i, retval;
+	int from, to;
+	struct direntry_uarea *dir_u = vi->vi_uarea;
+
+	retval = 0;
+	if (first == 0)
+		from = 0;
+	else
+		from = dir_u->entry_count - count;
+	to = from + count - 1;
+
+	for (i = from; i <= to; i++)
+		retval += dir_u->entry_sizes[i];
+
+	return retval;
+}
+
+static int direntry_unit_num(struct virtual_item *vi)
+{
+	struct direntry_uarea *dir_u = vi->vi_uarea;
+
+	return dir_u->entry_count;
+}
+
+static void direntry_print_vi(struct virtual_item *vi)
+{
+	int i;
+	struct direntry_uarea *dir_u = vi->vi_uarea;
+
+	reiserfs_warning(NULL, "reiserfs-16104",
+			 "DIRENTRY, index %d, type 0x%x, %h, flags 0x%x",
+			 vi->vi_index, vi->vi_type, vi->vi_ih, dir_u->flags);
+	printk("%d entries: ", dir_u->entry_count);
+	for (i = 0; i < dir_u->entry_count; i++)
+		printk("%d ", dir_u->entry_sizes[i]);
+	printk("\n");
+}
+
+static struct item_operations direntry_ops = {
+	.bytes_number = direntry_bytes_number,
+	.decrement_key = direntry_decrement_key,
+	.is_left_mergeable = direntry_is_left_mergeable,
+	.print_item = direntry_print_item,
+	.check_item = direntry_check_item,
+
+	.create_vi = direntry_create_vi,
+	.check_left = direntry_check_left,
+	.check_right = direntry_check_right,
+	.part_size = direntry_part_size,
+	.unit_num = direntry_unit_num,
+	.print_vi = direntry_print_vi
+};
+
+/* Error catching functions to catch errors caused by incorrect item types. */
+static int errcatch_bytes_number(struct item_head *ih, int block_size)
+{
+	reiserfs_warning(NULL, "green-16001",
+			 "Invalid item type observed, run fsck ASAP");
+	return 0;
+}
+
+static void errcatch_decrement_key(struct cpu_key *key)
+{
+	reiserfs_warning(NULL, "green-16002",
+			 "Invalid item type observed, run fsck ASAP");
+}
+
+static int errcatch_is_left_mergeable(struct reiserfs_key *key,
+				      unsigned long bsize)
+{
+	reiserfs_warning(NULL, "green-16003",
+			 "Invalid item type observed, run fsck ASAP");
+	return 0;
+}
+
+static void errcatch_print_item(struct item_head *ih, char *item)
+{
+	reiserfs_warning(NULL, "green-16004",
+			 "Invalid item type observed, run fsck ASAP");
+}
+
+static void errcatch_check_item(struct item_head *ih, char *item)
+{
+	reiserfs_warning(NULL, "green-16005",
+			 "Invalid item type observed, run fsck ASAP");
+}
+
+static int errcatch_create_vi(struct virtual_node *vn,
+			      struct virtual_item *vi,
+			      int is_affected, int insert_size)
+{
+	reiserfs_warning(NULL, "green-16006",
+			 "Invalid item type observed, run fsck ASAP");
+	/*
+	 * We might return -1 here as well, but it won't help as
+	 * create_virtual_node() from where this operation is called
+	 * from is of return type void.
+	 */
+	return 0;
+}
+
+static int errcatch_check_left(struct virtual_item *vi, int free,
+			       int start_skip, int end_skip)
+{
+	reiserfs_warning(NULL, "green-16007",
+			 "Invalid item type observed, run fsck ASAP");
+	return -1;
+}
+
+static int errcatch_check_right(struct virtual_item *vi, int free)
+{
+	reiserfs_warning(NULL, "green-16008",
+			 "Invalid item type observed, run fsck ASAP");
+	return -1;
+}
+
+static int errcatch_part_size(struct virtual_item *vi, int first, int count)
+{
+	reiserfs_warning(NULL, "green-16009",
+			 "Invalid item type observed, run fsck ASAP");
+	return 0;
+}
+
+static int errcatch_unit_num(struct virtual_item *vi)
+{
+	reiserfs_warning(NULL, "green-16010",
+			 "Invalid item type observed, run fsck ASAP");
+	return 0;
+}
+
+static void errcatch_print_vi(struct virtual_item *vi)
+{
+	reiserfs_warning(NULL, "green-16011",
+			 "Invalid item type observed, run fsck ASAP");
+}
+
+static struct item_operations errcatch_ops = {
+	.bytes_number = errcatch_bytes_number,
+	.decrement_key = errcatch_decrement_key,
+	.is_left_mergeable = errcatch_is_left_mergeable,
+	.print_item = errcatch_print_item,
+	.check_item = errcatch_check_item,
+
+	.create_vi = errcatch_create_vi,
+	.check_left = errcatch_check_left,
+	.check_right = errcatch_check_right,
+	.part_size = errcatch_part_size,
+	.unit_num = errcatch_unit_num,
+	.print_vi = errcatch_print_vi
+};
+
+#if ! (TYPE_STAT_DATA == 0 && TYPE_INDIRECT == 1 && TYPE_DIRECT == 2 && TYPE_DIRENTRY == 3)
+#error Item types must use disk-format assigned values.
+#endif
+
+struct item_operations *item_ops[TYPE_ANY + 1] = {
+	&stat_data_ops,
+	&indirect_ops,
+	&direct_ops,
+	&direntry_ops,
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	&errcatch_ops		/* This is to catch errors with invalid type (15th entry for TYPE_ANY) */
+};