1428 lines
41 KiB
C
Executable File
1428 lines
41 KiB
C
Executable File
/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*/
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#include <linux/uaccess.h>
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#include <linux/string.h>
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#include <linux/time.h>
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#include "reiserfs.h"
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#include <linux/buffer_head.h>
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/*
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* copy copy_count entries from source directory item to dest buffer
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* (creating new item if needed)
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*/
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static void leaf_copy_dir_entries(struct buffer_info *dest_bi,
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struct buffer_head *source, int last_first,
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int item_num, int from, int copy_count)
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{
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struct buffer_head *dest = dest_bi->bi_bh;
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/*
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* either the number of target item, or if we must create a
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* new item, the number of the item we will create it next to
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*/
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int item_num_in_dest;
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struct item_head *ih;
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struct reiserfs_de_head *deh;
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int copy_records_len; /* length of all records in item to be copied */
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char *records;
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ih = item_head(source, item_num);
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RFALSE(!is_direntry_le_ih(ih), "vs-10000: item must be directory item");
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/*
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* length of all record to be copied and first byte of
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* the last of them
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*/
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deh = B_I_DEH(source, ih);
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if (copy_count) {
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copy_records_len = (from ? deh_location(&deh[from - 1]) :
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ih_item_len(ih)) -
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deh_location(&deh[from + copy_count - 1]);
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records =
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source->b_data + ih_location(ih) +
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deh_location(&deh[from + copy_count - 1]);
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} else {
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copy_records_len = 0;
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records = NULL;
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}
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/* when copy last to first, dest buffer can contain 0 items */
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item_num_in_dest =
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(last_first ==
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LAST_TO_FIRST) ? ((B_NR_ITEMS(dest)) ? 0 : -1) : (B_NR_ITEMS(dest)
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- 1);
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/*
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* if there are no items in dest or the first/last item in
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* dest is not item of the same directory
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*/
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if ((item_num_in_dest == -1) ||
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(last_first == FIRST_TO_LAST && le_ih_k_offset(ih) == DOT_OFFSET) ||
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(last_first == LAST_TO_FIRST
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&& comp_short_le_keys /*COMP_SHORT_KEYS */ (&ih->ih_key,
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leaf_key(dest,
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item_num_in_dest))))
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{
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/* create new item in dest */
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struct item_head new_ih;
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/* form item header */
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memcpy(&new_ih.ih_key, &ih->ih_key, KEY_SIZE);
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put_ih_version(&new_ih, KEY_FORMAT_3_5);
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/* calculate item len */
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put_ih_item_len(&new_ih,
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DEH_SIZE * copy_count + copy_records_len);
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put_ih_entry_count(&new_ih, 0);
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if (last_first == LAST_TO_FIRST) {
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/* form key by the following way */
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if (from < ih_entry_count(ih)) {
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set_le_ih_k_offset(&new_ih,
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deh_offset(&deh[from]));
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} else {
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/*
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* no entries will be copied to this
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* item in this function
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*/
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set_le_ih_k_offset(&new_ih, U32_MAX);
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/*
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* this item is not yet valid, but we
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* want I_IS_DIRECTORY_ITEM to return 1
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* for it, so we -1
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*/
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}
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set_le_key_k_type(KEY_FORMAT_3_5, &new_ih.ih_key,
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TYPE_DIRENTRY);
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}
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/* insert item into dest buffer */
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leaf_insert_into_buf(dest_bi,
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(last_first ==
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LAST_TO_FIRST) ? 0 : B_NR_ITEMS(dest),
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&new_ih, NULL, 0);
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} else {
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/* prepare space for entries */
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leaf_paste_in_buffer(dest_bi,
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(last_first ==
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FIRST_TO_LAST) ? (B_NR_ITEMS(dest) -
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1) : 0, MAX_US_INT,
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DEH_SIZE * copy_count + copy_records_len,
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records, 0);
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}
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item_num_in_dest =
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(last_first == FIRST_TO_LAST) ? (B_NR_ITEMS(dest) - 1) : 0;
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leaf_paste_entries(dest_bi, item_num_in_dest,
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(last_first ==
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FIRST_TO_LAST) ? ih_entry_count(item_head(dest,
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item_num_in_dest))
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: 0, copy_count, deh + from, records,
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DEH_SIZE * copy_count + copy_records_len);
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}
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/*
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* Copy the first (if last_first == FIRST_TO_LAST) or last
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* (last_first == LAST_TO_FIRST) item or part of it or nothing
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* (see the return 0 below) from SOURCE to the end (if last_first)
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* or beginning (!last_first) of the DEST
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*/
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/* returns 1 if anything was copied, else 0 */
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static int leaf_copy_boundary_item(struct buffer_info *dest_bi,
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struct buffer_head *src, int last_first,
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int bytes_or_entries)
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{
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struct buffer_head *dest = dest_bi->bi_bh;
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/* number of items in the source and destination buffers */
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int dest_nr_item, src_nr_item;
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struct item_head *ih;
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struct item_head *dih;
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dest_nr_item = B_NR_ITEMS(dest);
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/*
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* if ( DEST is empty or first item of SOURCE and last item of
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* DEST are the items of different objects or of different types )
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* then there is no need to treat this item differently from the
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* other items that we copy, so we return
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*/
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if (last_first == FIRST_TO_LAST) {
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ih = item_head(src, 0);
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dih = item_head(dest, dest_nr_item - 1);
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/* there is nothing to merge */
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if (!dest_nr_item
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|| (!op_is_left_mergeable(&ih->ih_key, src->b_size)))
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return 0;
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RFALSE(!ih_item_len(ih),
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"vs-10010: item can not have empty length");
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if (is_direntry_le_ih(ih)) {
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if (bytes_or_entries == -1)
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/* copy all entries to dest */
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bytes_or_entries = ih_entry_count(ih);
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leaf_copy_dir_entries(dest_bi, src, FIRST_TO_LAST, 0, 0,
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bytes_or_entries);
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return 1;
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}
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/*
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* copy part of the body of the first item of SOURCE
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* to the end of the body of the last item of the DEST
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* part defined by 'bytes_or_entries'; if bytes_or_entries
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* == -1 copy whole body; don't create new item header
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*/
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if (bytes_or_entries == -1)
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bytes_or_entries = ih_item_len(ih);
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#ifdef CONFIG_REISERFS_CHECK
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else {
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if (bytes_or_entries == ih_item_len(ih)
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&& is_indirect_le_ih(ih))
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if (get_ih_free_space(ih))
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reiserfs_panic(sb_from_bi(dest_bi),
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"vs-10020",
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"last unformatted node "
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"must be filled "
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"entirely (%h)", ih);
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}
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#endif
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/*
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* merge first item (or its part) of src buffer with the last
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* item of dest buffer. Both are of the same file
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*/
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leaf_paste_in_buffer(dest_bi,
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dest_nr_item - 1, ih_item_len(dih),
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bytes_or_entries, ih_item_body(src, ih), 0);
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if (is_indirect_le_ih(dih)) {
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RFALSE(get_ih_free_space(dih),
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"vs-10030: merge to left: last unformatted node of non-last indirect item %h must have zerto free space",
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ih);
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if (bytes_or_entries == ih_item_len(ih))
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set_ih_free_space(dih, get_ih_free_space(ih));
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}
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return 1;
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}
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/* copy boundary item to right (last_first == LAST_TO_FIRST) */
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/*
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* (DEST is empty or last item of SOURCE and first item of DEST
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* are the items of different object or of different types)
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*/
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src_nr_item = B_NR_ITEMS(src);
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ih = item_head(src, src_nr_item - 1);
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dih = item_head(dest, 0);
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if (!dest_nr_item || !op_is_left_mergeable(&dih->ih_key, src->b_size))
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return 0;
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if (is_direntry_le_ih(ih)) {
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/*
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* bytes_or_entries = entries number in last
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* item body of SOURCE
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*/
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if (bytes_or_entries == -1)
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bytes_or_entries = ih_entry_count(ih);
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leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST,
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src_nr_item - 1,
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ih_entry_count(ih) - bytes_or_entries,
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bytes_or_entries);
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return 1;
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}
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/*
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* copy part of the body of the last item of SOURCE to the
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* begin of the body of the first item of the DEST; part defined
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* by 'bytes_or_entries'; if byte_or_entriess == -1 copy whole body;
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* change first item key of the DEST; don't create new item header
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*/
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RFALSE(is_indirect_le_ih(ih) && get_ih_free_space(ih),
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"vs-10040: merge to right: last unformatted node of non-last indirect item must be filled entirely (%h)",
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ih);
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if (bytes_or_entries == -1) {
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/* bytes_or_entries = length of last item body of SOURCE */
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bytes_or_entries = ih_item_len(ih);
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RFALSE(le_ih_k_offset(dih) !=
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le_ih_k_offset(ih) + op_bytes_number(ih, src->b_size),
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"vs-10050: items %h and %h do not match", ih, dih);
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/* change first item key of the DEST */
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set_le_ih_k_offset(dih, le_ih_k_offset(ih));
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/* item becomes non-mergeable */
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/* or mergeable if left item was */
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set_le_ih_k_type(dih, le_ih_k_type(ih));
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} else {
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/* merge to right only part of item */
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RFALSE(ih_item_len(ih) <= bytes_or_entries,
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"vs-10060: no so much bytes %lu (needed %lu)",
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(unsigned long)ih_item_len(ih),
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(unsigned long)bytes_or_entries);
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/* change first item key of the DEST */
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if (is_direct_le_ih(dih)) {
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RFALSE(le_ih_k_offset(dih) <=
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(unsigned long)bytes_or_entries,
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"vs-10070: dih %h, bytes_or_entries(%d)", dih,
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bytes_or_entries);
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set_le_ih_k_offset(dih,
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le_ih_k_offset(dih) -
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bytes_or_entries);
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} else {
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RFALSE(le_ih_k_offset(dih) <=
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(bytes_or_entries / UNFM_P_SIZE) * dest->b_size,
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"vs-10080: dih %h, bytes_or_entries(%d)",
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dih,
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(bytes_or_entries / UNFM_P_SIZE) * dest->b_size);
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set_le_ih_k_offset(dih,
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le_ih_k_offset(dih) -
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((bytes_or_entries / UNFM_P_SIZE) *
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dest->b_size));
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}
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}
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leaf_paste_in_buffer(dest_bi, 0, 0, bytes_or_entries,
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ih_item_body(src,
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ih) + ih_item_len(ih) - bytes_or_entries,
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0);
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return 1;
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}
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/*
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* copy cpy_mun items from buffer src to buffer dest
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* last_first == FIRST_TO_LAST means, that we copy cpy_num items beginning
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* from first-th item in src to tail of dest
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* last_first == LAST_TO_FIRST means, that we copy cpy_num items beginning
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* from first-th item in src to head of dest
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*/
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static void leaf_copy_items_entirely(struct buffer_info *dest_bi,
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struct buffer_head *src, int last_first,
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int first, int cpy_num)
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{
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struct buffer_head *dest;
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int nr, free_space;
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int dest_before;
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int last_loc, last_inserted_loc, location;
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int i, j;
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struct block_head *blkh;
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struct item_head *ih;
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RFALSE(last_first != LAST_TO_FIRST && last_first != FIRST_TO_LAST,
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"vs-10090: bad last_first parameter %d", last_first);
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RFALSE(B_NR_ITEMS(src) - first < cpy_num,
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"vs-10100: too few items in source %d, required %d from %d",
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B_NR_ITEMS(src), cpy_num, first);
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RFALSE(cpy_num < 0, "vs-10110: can not copy negative amount of items");
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RFALSE(!dest_bi, "vs-10120: can not copy negative amount of items");
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dest = dest_bi->bi_bh;
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RFALSE(!dest, "vs-10130: can not copy negative amount of items");
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if (cpy_num == 0)
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return;
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blkh = B_BLK_HEAD(dest);
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nr = blkh_nr_item(blkh);
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free_space = blkh_free_space(blkh);
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/*
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* we will insert items before 0-th or nr-th item in dest buffer.
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* It depends of last_first parameter
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*/
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dest_before = (last_first == LAST_TO_FIRST) ? 0 : nr;
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/* location of head of first new item */
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ih = item_head(dest, dest_before);
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RFALSE(blkh_free_space(blkh) < cpy_num * IH_SIZE,
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"vs-10140: not enough free space for headers %d (needed %d)",
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B_FREE_SPACE(dest), cpy_num * IH_SIZE);
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/* prepare space for headers */
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memmove(ih + cpy_num, ih, (nr - dest_before) * IH_SIZE);
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/* copy item headers */
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memcpy(ih, item_head(src, first), cpy_num * IH_SIZE);
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free_space -= (IH_SIZE * cpy_num);
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set_blkh_free_space(blkh, free_space);
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/* location of unmovable item */
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j = location = (dest_before == 0) ? dest->b_size : ih_location(ih - 1);
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for (i = dest_before; i < nr + cpy_num; i++) {
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location -= ih_item_len(ih + i - dest_before);
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put_ih_location(ih + i - dest_before, location);
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}
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/* prepare space for items */
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last_loc = ih_location(&ih[nr + cpy_num - 1 - dest_before]);
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last_inserted_loc = ih_location(&ih[cpy_num - 1]);
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/* check free space */
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RFALSE(free_space < j - last_inserted_loc,
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"vs-10150: not enough free space for items %d (needed %d)",
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free_space, j - last_inserted_loc);
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memmove(dest->b_data + last_loc,
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dest->b_data + last_loc + j - last_inserted_loc,
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last_inserted_loc - last_loc);
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/* copy items */
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memcpy(dest->b_data + last_inserted_loc,
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item_body(src, (first + cpy_num - 1)),
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j - last_inserted_loc);
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/* sizes, item number */
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set_blkh_nr_item(blkh, nr + cpy_num);
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set_blkh_free_space(blkh, free_space - (j - last_inserted_loc));
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do_balance_mark_leaf_dirty(dest_bi->tb, dest, 0);
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if (dest_bi->bi_parent) {
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struct disk_child *t_dc;
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t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
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RFALSE(dc_block_number(t_dc) != dest->b_blocknr,
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"vs-10160: block number in bh does not match to field in disk_child structure %lu and %lu",
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(long unsigned)dest->b_blocknr,
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(long unsigned)dc_block_number(t_dc));
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put_dc_size(t_dc,
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dc_size(t_dc) + (j - last_inserted_loc +
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IH_SIZE * cpy_num));
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do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
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0);
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}
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}
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|
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/*
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* This function splits the (liquid) item into two items (useful when
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* shifting part of an item into another node.)
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*/
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static void leaf_item_bottle(struct buffer_info *dest_bi,
|
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struct buffer_head *src, int last_first,
|
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int item_num, int cpy_bytes)
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{
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struct buffer_head *dest = dest_bi->bi_bh;
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struct item_head *ih;
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RFALSE(cpy_bytes == -1,
|
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"vs-10170: bytes == - 1 means: do not split item");
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|
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if (last_first == FIRST_TO_LAST) {
|
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/*
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* if ( if item in position item_num in buffer SOURCE
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* is directory item )
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*/
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ih = item_head(src, item_num);
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if (is_direntry_le_ih(ih))
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leaf_copy_dir_entries(dest_bi, src, FIRST_TO_LAST,
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item_num, 0, cpy_bytes);
|
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else {
|
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struct item_head n_ih;
|
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|
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/*
|
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* copy part of the body of the item number 'item_num'
|
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* of SOURCE to the end of the DEST part defined by
|
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* 'cpy_bytes'; create new item header; change old
|
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* item_header (????); n_ih = new item_header;
|
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*/
|
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memcpy(&n_ih, ih, IH_SIZE);
|
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put_ih_item_len(&n_ih, cpy_bytes);
|
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if (is_indirect_le_ih(ih)) {
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RFALSE(cpy_bytes == ih_item_len(ih)
|
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&& get_ih_free_space(ih),
|
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"vs-10180: when whole indirect item is bottle to left neighbor, it must have free_space==0 (not %lu)",
|
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(long unsigned)get_ih_free_space(ih));
|
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set_ih_free_space(&n_ih, 0);
|
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}
|
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|
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RFALSE(op_is_left_mergeable(&ih->ih_key, src->b_size),
|
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"vs-10190: bad mergeability of item %h", ih);
|
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n_ih.ih_version = ih->ih_version; /* JDM Endian safe, both le */
|
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leaf_insert_into_buf(dest_bi, B_NR_ITEMS(dest), &n_ih,
|
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item_body(src, item_num), 0);
|
|
}
|
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} else {
|
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/*
|
|
* if ( if item in position item_num in buffer
|
|
* SOURCE is directory item )
|
|
*/
|
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ih = item_head(src, item_num);
|
|
if (is_direntry_le_ih(ih))
|
|
leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST,
|
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item_num,
|
|
ih_entry_count(ih) - cpy_bytes,
|
|
cpy_bytes);
|
|
else {
|
|
struct item_head n_ih;
|
|
|
|
/*
|
|
* copy part of the body of the item number 'item_num'
|
|
* of SOURCE to the begin of the DEST part defined by
|
|
* 'cpy_bytes'; create new item header;
|
|
* n_ih = new item_header;
|
|
*/
|
|
memcpy(&n_ih, ih, SHORT_KEY_SIZE);
|
|
|
|
/* Endian safe, both le */
|
|
n_ih.ih_version = ih->ih_version;
|
|
|
|
if (is_direct_le_ih(ih)) {
|
|
set_le_ih_k_offset(&n_ih,
|
|
le_ih_k_offset(ih) +
|
|
ih_item_len(ih) - cpy_bytes);
|
|
set_le_ih_k_type(&n_ih, TYPE_DIRECT);
|
|
set_ih_free_space(&n_ih, MAX_US_INT);
|
|
} else {
|
|
/* indirect item */
|
|
RFALSE(!cpy_bytes && get_ih_free_space(ih),
|
|
"vs-10200: ih->ih_free_space must be 0 when indirect item will be appended");
|
|
set_le_ih_k_offset(&n_ih,
|
|
le_ih_k_offset(ih) +
|
|
(ih_item_len(ih) -
|
|
cpy_bytes) / UNFM_P_SIZE *
|
|
dest->b_size);
|
|
set_le_ih_k_type(&n_ih, TYPE_INDIRECT);
|
|
set_ih_free_space(&n_ih, get_ih_free_space(ih));
|
|
}
|
|
|
|
/* set item length */
|
|
put_ih_item_len(&n_ih, cpy_bytes);
|
|
|
|
/* Endian safe, both le */
|
|
n_ih.ih_version = ih->ih_version;
|
|
|
|
leaf_insert_into_buf(dest_bi, 0, &n_ih,
|
|
item_body(src, item_num) +
|
|
ih_item_len(ih) - cpy_bytes, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If cpy_bytes equals minus one than copy cpy_num whole items from SOURCE
|
|
* to DEST. If cpy_bytes not equal to minus one than copy cpy_num-1 whole
|
|
* items from SOURCE to DEST. From last item copy cpy_num bytes for regular
|
|
* item and cpy_num directory entries for directory item.
|
|
*/
|
|
static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src,
|
|
int last_first, int cpy_num, int cpy_bytes)
|
|
{
|
|
struct buffer_head *dest;
|
|
int pos, i, src_nr_item, bytes;
|
|
|
|
dest = dest_bi->bi_bh;
|
|
RFALSE(!dest || !src, "vs-10210: !dest || !src");
|
|
RFALSE(last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST,
|
|
"vs-10220:last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST");
|
|
RFALSE(B_NR_ITEMS(src) < cpy_num,
|
|
"vs-10230: No enough items: %d, req. %d", B_NR_ITEMS(src),
|
|
cpy_num);
|
|
RFALSE(cpy_num < 0, "vs-10240: cpy_num < 0 (%d)", cpy_num);
|
|
|
|
if (cpy_num == 0)
|
|
return 0;
|
|
|
|
if (last_first == FIRST_TO_LAST) {
|
|
/* copy items to left */
|
|
pos = 0;
|
|
if (cpy_num == 1)
|
|
bytes = cpy_bytes;
|
|
else
|
|
bytes = -1;
|
|
|
|
/*
|
|
* copy the first item or it part or nothing to the end of
|
|
* the DEST (i = leaf_copy_boundary_item(DEST,SOURCE,0,bytes))
|
|
*/
|
|
i = leaf_copy_boundary_item(dest_bi, src, FIRST_TO_LAST, bytes);
|
|
cpy_num -= i;
|
|
if (cpy_num == 0)
|
|
return i;
|
|
pos += i;
|
|
if (cpy_bytes == -1)
|
|
/*
|
|
* copy first cpy_num items starting from position
|
|
* 'pos' of SOURCE to end of DEST
|
|
*/
|
|
leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST,
|
|
pos, cpy_num);
|
|
else {
|
|
/*
|
|
* copy first cpy_num-1 items starting from position
|
|
* 'pos-1' of the SOURCE to the end of the DEST
|
|
*/
|
|
leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST,
|
|
pos, cpy_num - 1);
|
|
|
|
/*
|
|
* copy part of the item which number is
|
|
* cpy_num+pos-1 to the end of the DEST
|
|
*/
|
|
leaf_item_bottle(dest_bi, src, FIRST_TO_LAST,
|
|
cpy_num + pos - 1, cpy_bytes);
|
|
}
|
|
} else {
|
|
/* copy items to right */
|
|
src_nr_item = B_NR_ITEMS(src);
|
|
if (cpy_num == 1)
|
|
bytes = cpy_bytes;
|
|
else
|
|
bytes = -1;
|
|
|
|
/*
|
|
* copy the last item or it part or nothing to the
|
|
* begin of the DEST
|
|
* (i = leaf_copy_boundary_item(DEST,SOURCE,1,bytes));
|
|
*/
|
|
i = leaf_copy_boundary_item(dest_bi, src, LAST_TO_FIRST, bytes);
|
|
|
|
cpy_num -= i;
|
|
if (cpy_num == 0)
|
|
return i;
|
|
|
|
pos = src_nr_item - cpy_num - i;
|
|
if (cpy_bytes == -1) {
|
|
/*
|
|
* starting from position 'pos' copy last cpy_num
|
|
* items of SOURCE to begin of DEST
|
|
*/
|
|
leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST,
|
|
pos, cpy_num);
|
|
} else {
|
|
/*
|
|
* copy last cpy_num-1 items starting from position
|
|
* 'pos+1' of the SOURCE to the begin of the DEST;
|
|
*/
|
|
leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST,
|
|
pos + 1, cpy_num - 1);
|
|
|
|
/*
|
|
* copy part of the item which number is pos to
|
|
* the begin of the DEST
|
|
*/
|
|
leaf_item_bottle(dest_bi, src, LAST_TO_FIRST, pos,
|
|
cpy_bytes);
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* there are types of coping: from S[0] to L[0], from S[0] to R[0],
|
|
* from R[0] to L[0]. for each of these we have to define parent and
|
|
* positions of destination and source buffers
|
|
*/
|
|
static void leaf_define_dest_src_infos(int shift_mode, struct tree_balance *tb,
|
|
struct buffer_info *dest_bi,
|
|
struct buffer_info *src_bi,
|
|
int *first_last,
|
|
struct buffer_head *Snew)
|
|
{
|
|
memset(dest_bi, 0, sizeof(struct buffer_info));
|
|
memset(src_bi, 0, sizeof(struct buffer_info));
|
|
|
|
/* define dest, src, dest parent, dest position */
|
|
switch (shift_mode) {
|
|
case LEAF_FROM_S_TO_L: /* it is used in leaf_shift_left */
|
|
src_bi->tb = tb;
|
|
src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
|
|
src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
|
|
|
|
/* src->b_item_order */
|
|
src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
|
|
dest_bi->tb = tb;
|
|
dest_bi->bi_bh = tb->L[0];
|
|
dest_bi->bi_parent = tb->FL[0];
|
|
dest_bi->bi_position = get_left_neighbor_position(tb, 0);
|
|
*first_last = FIRST_TO_LAST;
|
|
break;
|
|
|
|
case LEAF_FROM_S_TO_R: /* it is used in leaf_shift_right */
|
|
src_bi->tb = tb;
|
|
src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
|
|
src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
|
|
src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
|
|
dest_bi->tb = tb;
|
|
dest_bi->bi_bh = tb->R[0];
|
|
dest_bi->bi_parent = tb->FR[0];
|
|
dest_bi->bi_position = get_right_neighbor_position(tb, 0);
|
|
*first_last = LAST_TO_FIRST;
|
|
break;
|
|
|
|
case LEAF_FROM_R_TO_L: /* it is used in balance_leaf_when_delete */
|
|
src_bi->tb = tb;
|
|
src_bi->bi_bh = tb->R[0];
|
|
src_bi->bi_parent = tb->FR[0];
|
|
src_bi->bi_position = get_right_neighbor_position(tb, 0);
|
|
dest_bi->tb = tb;
|
|
dest_bi->bi_bh = tb->L[0];
|
|
dest_bi->bi_parent = tb->FL[0];
|
|
dest_bi->bi_position = get_left_neighbor_position(tb, 0);
|
|
*first_last = FIRST_TO_LAST;
|
|
break;
|
|
|
|
case LEAF_FROM_L_TO_R: /* it is used in balance_leaf_when_delete */
|
|
src_bi->tb = tb;
|
|
src_bi->bi_bh = tb->L[0];
|
|
src_bi->bi_parent = tb->FL[0];
|
|
src_bi->bi_position = get_left_neighbor_position(tb, 0);
|
|
dest_bi->tb = tb;
|
|
dest_bi->bi_bh = tb->R[0];
|
|
dest_bi->bi_parent = tb->FR[0];
|
|
dest_bi->bi_position = get_right_neighbor_position(tb, 0);
|
|
*first_last = LAST_TO_FIRST;
|
|
break;
|
|
|
|
case LEAF_FROM_S_TO_SNEW:
|
|
src_bi->tb = tb;
|
|
src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
|
|
src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
|
|
src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
|
|
dest_bi->tb = tb;
|
|
dest_bi->bi_bh = Snew;
|
|
dest_bi->bi_parent = NULL;
|
|
dest_bi->bi_position = 0;
|
|
*first_last = LAST_TO_FIRST;
|
|
break;
|
|
|
|
default:
|
|
reiserfs_panic(sb_from_bi(src_bi), "vs-10250",
|
|
"shift type is unknown (%d)", shift_mode);
|
|
}
|
|
RFALSE(!src_bi->bi_bh || !dest_bi->bi_bh,
|
|
"vs-10260: mode==%d, source (%p) or dest (%p) buffer is initialized incorrectly",
|
|
shift_mode, src_bi->bi_bh, dest_bi->bi_bh);
|
|
}
|
|
|
|
/*
|
|
* copy mov_num items and mov_bytes of the (mov_num-1)th item to
|
|
* neighbor. Delete them from source
|
|
*/
|
|
int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num,
|
|
int mov_bytes, struct buffer_head *Snew)
|
|
{
|
|
int ret_value;
|
|
struct buffer_info dest_bi, src_bi;
|
|
int first_last;
|
|
|
|
leaf_define_dest_src_infos(shift_mode, tb, &dest_bi, &src_bi,
|
|
&first_last, Snew);
|
|
|
|
ret_value =
|
|
leaf_copy_items(&dest_bi, src_bi.bi_bh, first_last, mov_num,
|
|
mov_bytes);
|
|
|
|
leaf_delete_items(&src_bi, first_last,
|
|
(first_last ==
|
|
FIRST_TO_LAST) ? 0 : (B_NR_ITEMS(src_bi.bi_bh) -
|
|
mov_num), mov_num, mov_bytes);
|
|
|
|
return ret_value;
|
|
}
|
|
|
|
/*
|
|
* Shift shift_num items (and shift_bytes of last shifted item if
|
|
* shift_bytes != -1) from S[0] to L[0] and replace the delimiting key
|
|
*/
|
|
int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes)
|
|
{
|
|
struct buffer_head *S0 = PATH_PLAST_BUFFER(tb->tb_path);
|
|
int i;
|
|
|
|
/*
|
|
* move shift_num (and shift_bytes bytes) items from S[0]
|
|
* to left neighbor L[0]
|
|
*/
|
|
i = leaf_move_items(LEAF_FROM_S_TO_L, tb, shift_num, shift_bytes, NULL);
|
|
|
|
if (shift_num) {
|
|
/* number of items in S[0] == 0 */
|
|
if (B_NR_ITEMS(S0) == 0) {
|
|
|
|
RFALSE(shift_bytes != -1,
|
|
"vs-10270: S0 is empty now, but shift_bytes != -1 (%d)",
|
|
shift_bytes);
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
if (tb->tb_mode == M_PASTE || tb->tb_mode == M_INSERT) {
|
|
print_cur_tb("vs-10275");
|
|
reiserfs_panic(tb->tb_sb, "vs-10275",
|
|
"balance condition corrupted "
|
|
"(%c)", tb->tb_mode);
|
|
}
|
|
#endif
|
|
|
|
if (PATH_H_POSITION(tb->tb_path, 1) == 0)
|
|
replace_key(tb, tb->CFL[0], tb->lkey[0],
|
|
PATH_H_PPARENT(tb->tb_path, 0), 0);
|
|
|
|
} else {
|
|
/* replace lkey in CFL[0] by 0-th key from S[0]; */
|
|
replace_key(tb, tb->CFL[0], tb->lkey[0], S0, 0);
|
|
|
|
RFALSE((shift_bytes != -1 &&
|
|
!(is_direntry_le_ih(item_head(S0, 0))
|
|
&& !ih_entry_count(item_head(S0, 0)))) &&
|
|
(!op_is_left_mergeable
|
|
(leaf_key(S0, 0), S0->b_size)),
|
|
"vs-10280: item must be mergeable");
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
/* CLEANING STOPPED HERE */
|
|
|
|
/*
|
|
* Shift shift_num (shift_bytes) items from S[0] to the right neighbor,
|
|
* and replace the delimiting key
|
|
*/
|
|
int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes)
|
|
{
|
|
int ret_value;
|
|
|
|
/*
|
|
* move shift_num (and shift_bytes) items from S[0] to
|
|
* right neighbor R[0]
|
|
*/
|
|
ret_value =
|
|
leaf_move_items(LEAF_FROM_S_TO_R, tb, shift_num, shift_bytes, NULL);
|
|
|
|
/* replace rkey in CFR[0] by the 0-th key from R[0] */
|
|
if (shift_num) {
|
|
replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
|
|
|
|
}
|
|
|
|
return ret_value;
|
|
}
|
|
|
|
static void leaf_delete_items_entirely(struct buffer_info *bi,
|
|
int first, int del_num);
|
|
/*
|
|
* If del_bytes == -1, starting from position 'first' delete del_num
|
|
* items in whole in buffer CUR.
|
|
* If not.
|
|
* If last_first == 0. Starting from position 'first' delete del_num-1
|
|
* items in whole. Delete part of body of the first item. Part defined by
|
|
* del_bytes. Don't delete first item header
|
|
* If last_first == 1. Starting from position 'first+1' delete del_num-1
|
|
* items in whole. Delete part of body of the last item . Part defined by
|
|
* del_bytes. Don't delete last item header.
|
|
*/
|
|
void leaf_delete_items(struct buffer_info *cur_bi, int last_first,
|
|
int first, int del_num, int del_bytes)
|
|
{
|
|
struct buffer_head *bh;
|
|
int item_amount = B_NR_ITEMS(bh = cur_bi->bi_bh);
|
|
|
|
RFALSE(!bh, "10155: bh is not defined");
|
|
RFALSE(del_num < 0, "10160: del_num can not be < 0. del_num==%d",
|
|
del_num);
|
|
RFALSE(first < 0
|
|
|| first + del_num > item_amount,
|
|
"10165: invalid number of first item to be deleted (%d) or "
|
|
"no so much items (%d) to delete (only %d)", first,
|
|
first + del_num, item_amount);
|
|
|
|
if (del_num == 0)
|
|
return;
|
|
|
|
if (first == 0 && del_num == item_amount && del_bytes == -1) {
|
|
make_empty_node(cur_bi);
|
|
do_balance_mark_leaf_dirty(cur_bi->tb, bh, 0);
|
|
return;
|
|
}
|
|
|
|
if (del_bytes == -1)
|
|
/* delete del_num items beginning from item in position first */
|
|
leaf_delete_items_entirely(cur_bi, first, del_num);
|
|
else {
|
|
if (last_first == FIRST_TO_LAST) {
|
|
/*
|
|
* delete del_num-1 items beginning from
|
|
* item in position first
|
|
*/
|
|
leaf_delete_items_entirely(cur_bi, first, del_num - 1);
|
|
|
|
/*
|
|
* delete the part of the first item of the bh
|
|
* do not delete item header
|
|
*/
|
|
leaf_cut_from_buffer(cur_bi, 0, 0, del_bytes);
|
|
} else {
|
|
struct item_head *ih;
|
|
int len;
|
|
|
|
/*
|
|
* delete del_num-1 items beginning from
|
|
* item in position first+1
|
|
*/
|
|
leaf_delete_items_entirely(cur_bi, first + 1,
|
|
del_num - 1);
|
|
|
|
ih = item_head(bh, B_NR_ITEMS(bh) - 1);
|
|
if (is_direntry_le_ih(ih))
|
|
/* the last item is directory */
|
|
/*
|
|
* len = numbers of directory entries
|
|
* in this item
|
|
*/
|
|
len = ih_entry_count(ih);
|
|
else
|
|
/* len = body len of item */
|
|
len = ih_item_len(ih);
|
|
|
|
/*
|
|
* delete the part of the last item of the bh
|
|
* do not delete item header
|
|
*/
|
|
leaf_cut_from_buffer(cur_bi, B_NR_ITEMS(bh) - 1,
|
|
len - del_bytes, del_bytes);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* insert item into the leaf node in position before */
|
|
void leaf_insert_into_buf(struct buffer_info *bi, int before,
|
|
struct item_head * const inserted_item_ih,
|
|
const char * const inserted_item_body,
|
|
int zeros_number)
|
|
{
|
|
struct buffer_head *bh = bi->bi_bh;
|
|
int nr, free_space;
|
|
struct block_head *blkh;
|
|
struct item_head *ih;
|
|
int i;
|
|
int last_loc, unmoved_loc;
|
|
char *to;
|
|
|
|
blkh = B_BLK_HEAD(bh);
|
|
nr = blkh_nr_item(blkh);
|
|
free_space = blkh_free_space(blkh);
|
|
|
|
/* check free space */
|
|
RFALSE(free_space < ih_item_len(inserted_item_ih) + IH_SIZE,
|
|
"vs-10170: not enough free space in block %z, new item %h",
|
|
bh, inserted_item_ih);
|
|
RFALSE(zeros_number > ih_item_len(inserted_item_ih),
|
|
"vs-10172: zero number == %d, item length == %d",
|
|
zeros_number, ih_item_len(inserted_item_ih));
|
|
|
|
/* get item new item must be inserted before */
|
|
ih = item_head(bh, before);
|
|
|
|
/* prepare space for the body of new item */
|
|
last_loc = nr ? ih_location(&ih[nr - before - 1]) : bh->b_size;
|
|
unmoved_loc = before ? ih_location(ih - 1) : bh->b_size;
|
|
|
|
memmove(bh->b_data + last_loc - ih_item_len(inserted_item_ih),
|
|
bh->b_data + last_loc, unmoved_loc - last_loc);
|
|
|
|
to = bh->b_data + unmoved_loc - ih_item_len(inserted_item_ih);
|
|
memset(to, 0, zeros_number);
|
|
to += zeros_number;
|
|
|
|
/* copy body to prepared space */
|
|
if (inserted_item_body)
|
|
memmove(to, inserted_item_body,
|
|
ih_item_len(inserted_item_ih) - zeros_number);
|
|
else
|
|
memset(to, '\0', ih_item_len(inserted_item_ih) - zeros_number);
|
|
|
|
/* insert item header */
|
|
memmove(ih + 1, ih, IH_SIZE * (nr - before));
|
|
memmove(ih, inserted_item_ih, IH_SIZE);
|
|
|
|
/* change locations */
|
|
for (i = before; i < nr + 1; i++) {
|
|
unmoved_loc -= ih_item_len(&ih[i - before]);
|
|
put_ih_location(&ih[i - before], unmoved_loc);
|
|
}
|
|
|
|
/* sizes, free space, item number */
|
|
set_blkh_nr_item(blkh, blkh_nr_item(blkh) + 1);
|
|
set_blkh_free_space(blkh,
|
|
free_space - (IH_SIZE +
|
|
ih_item_len(inserted_item_ih)));
|
|
do_balance_mark_leaf_dirty(bi->tb, bh, 1);
|
|
|
|
if (bi->bi_parent) {
|
|
struct disk_child *t_dc;
|
|
t_dc = B_N_CHILD(bi->bi_parent, bi->bi_position);
|
|
put_dc_size(t_dc,
|
|
dc_size(t_dc) + (IH_SIZE +
|
|
ih_item_len(inserted_item_ih)));
|
|
do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* paste paste_size bytes to affected_item_num-th item.
|
|
* When item is a directory, this only prepare space for new entries
|
|
*/
|
|
void leaf_paste_in_buffer(struct buffer_info *bi, int affected_item_num,
|
|
int pos_in_item, int paste_size,
|
|
const char *body, int zeros_number)
|
|
{
|
|
struct buffer_head *bh = bi->bi_bh;
|
|
int nr, free_space;
|
|
struct block_head *blkh;
|
|
struct item_head *ih;
|
|
int i;
|
|
int last_loc, unmoved_loc;
|
|
|
|
blkh = B_BLK_HEAD(bh);
|
|
nr = blkh_nr_item(blkh);
|
|
free_space = blkh_free_space(blkh);
|
|
|
|
/* check free space */
|
|
RFALSE(free_space < paste_size,
|
|
"vs-10175: not enough free space: needed %d, available %d",
|
|
paste_size, free_space);
|
|
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
if (zeros_number > paste_size) {
|
|
struct super_block *sb = NULL;
|
|
if (bi && bi->tb)
|
|
sb = bi->tb->tb_sb;
|
|
print_cur_tb("10177");
|
|
reiserfs_panic(sb, "vs-10177",
|
|
"zeros_number == %d, paste_size == %d",
|
|
zeros_number, paste_size);
|
|
}
|
|
#endif /* CONFIG_REISERFS_CHECK */
|
|
|
|
/* item to be appended */
|
|
ih = item_head(bh, affected_item_num);
|
|
|
|
last_loc = ih_location(&ih[nr - affected_item_num - 1]);
|
|
unmoved_loc = affected_item_num ? ih_location(ih - 1) : bh->b_size;
|
|
|
|
/* prepare space */
|
|
memmove(bh->b_data + last_loc - paste_size, bh->b_data + last_loc,
|
|
unmoved_loc - last_loc);
|
|
|
|
/* change locations */
|
|
for (i = affected_item_num; i < nr; i++)
|
|
put_ih_location(&ih[i - affected_item_num],
|
|
ih_location(&ih[i - affected_item_num]) -
|
|
paste_size);
|
|
|
|
if (body) {
|
|
if (!is_direntry_le_ih(ih)) {
|
|
if (!pos_in_item) {
|
|
/* shift data to right */
|
|
memmove(bh->b_data + ih_location(ih) +
|
|
paste_size,
|
|
bh->b_data + ih_location(ih),
|
|
ih_item_len(ih));
|
|
/* paste data in the head of item */
|
|
memset(bh->b_data + ih_location(ih), 0,
|
|
zeros_number);
|
|
memcpy(bh->b_data + ih_location(ih) +
|
|
zeros_number, body,
|
|
paste_size - zeros_number);
|
|
} else {
|
|
memset(bh->b_data + unmoved_loc - paste_size, 0,
|
|
zeros_number);
|
|
memcpy(bh->b_data + unmoved_loc - paste_size +
|
|
zeros_number, body,
|
|
paste_size - zeros_number);
|
|
}
|
|
}
|
|
} else
|
|
memset(bh->b_data + unmoved_loc - paste_size, '\0', paste_size);
|
|
|
|
put_ih_item_len(ih, ih_item_len(ih) + paste_size);
|
|
|
|
/* change free space */
|
|
set_blkh_free_space(blkh, free_space - paste_size);
|
|
|
|
do_balance_mark_leaf_dirty(bi->tb, bh, 0);
|
|
|
|
if (bi->bi_parent) {
|
|
struct disk_child *t_dc =
|
|
B_N_CHILD(bi->bi_parent, bi->bi_position);
|
|
put_dc_size(t_dc, dc_size(t_dc) + paste_size);
|
|
do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* cuts DEL_COUNT entries beginning from FROM-th entry. Directory item
|
|
* does not have free space, so it moves DEHs and remaining records as
|
|
* necessary. Return value is size of removed part of directory item
|
|
* in bytes.
|
|
*/
|
|
static int leaf_cut_entries(struct buffer_head *bh,
|
|
struct item_head *ih, int from, int del_count)
|
|
{
|
|
char *item;
|
|
struct reiserfs_de_head *deh;
|
|
int prev_record_offset; /* offset of record, that is (from-1)th */
|
|
char *prev_record; /* */
|
|
int cut_records_len; /* length of all removed records */
|
|
int i;
|
|
|
|
/*
|
|
* make sure that item is directory and there are enough entries to
|
|
* remove
|
|
*/
|
|
RFALSE(!is_direntry_le_ih(ih), "10180: item is not directory item");
|
|
RFALSE(ih_entry_count(ih) < from + del_count,
|
|
"10185: item contains not enough entries: entry_count = %d, from = %d, to delete = %d",
|
|
ih_entry_count(ih), from, del_count);
|
|
|
|
if (del_count == 0)
|
|
return 0;
|
|
|
|
/* first byte of item */
|
|
item = bh->b_data + ih_location(ih);
|
|
|
|
/* entry head array */
|
|
deh = B_I_DEH(bh, ih);
|
|
|
|
/*
|
|
* first byte of remaining entries, those are BEFORE cut entries
|
|
* (prev_record) and length of all removed records (cut_records_len)
|
|
*/
|
|
prev_record_offset =
|
|
(from ? deh_location(&deh[from - 1]) : ih_item_len(ih));
|
|
cut_records_len = prev_record_offset /*from_record */ -
|
|
deh_location(&deh[from + del_count - 1]);
|
|
prev_record = item + prev_record_offset;
|
|
|
|
/* adjust locations of remaining entries */
|
|
for (i = ih_entry_count(ih) - 1; i > from + del_count - 1; i--)
|
|
put_deh_location(&deh[i],
|
|
deh_location(&deh[i]) -
|
|
(DEH_SIZE * del_count));
|
|
|
|
for (i = 0; i < from; i++)
|
|
put_deh_location(&deh[i],
|
|
deh_location(&deh[i]) - (DEH_SIZE * del_count +
|
|
cut_records_len));
|
|
|
|
put_ih_entry_count(ih, ih_entry_count(ih) - del_count);
|
|
|
|
/* shift entry head array and entries those are AFTER removed entries */
|
|
memmove((char *)(deh + from),
|
|
deh + from + del_count,
|
|
prev_record - cut_records_len - (char *)(deh + from +
|
|
del_count));
|
|
|
|
/* shift records, those are BEFORE removed entries */
|
|
memmove(prev_record - cut_records_len - DEH_SIZE * del_count,
|
|
prev_record, item + ih_item_len(ih) - prev_record);
|
|
|
|
return DEH_SIZE * del_count + cut_records_len;
|
|
}
|
|
|
|
/*
|
|
* when cut item is part of regular file
|
|
* pos_in_item - first byte that must be cut
|
|
* cut_size - number of bytes to be cut beginning from pos_in_item
|
|
*
|
|
* when cut item is part of directory
|
|
* pos_in_item - number of first deleted entry
|
|
* cut_size - count of deleted entries
|
|
*/
|
|
void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num,
|
|
int pos_in_item, int cut_size)
|
|
{
|
|
int nr;
|
|
struct buffer_head *bh = bi->bi_bh;
|
|
struct block_head *blkh;
|
|
struct item_head *ih;
|
|
int last_loc, unmoved_loc;
|
|
int i;
|
|
|
|
blkh = B_BLK_HEAD(bh);
|
|
nr = blkh_nr_item(blkh);
|
|
|
|
/* item head of truncated item */
|
|
ih = item_head(bh, cut_item_num);
|
|
|
|
if (is_direntry_le_ih(ih)) {
|
|
/* first cut entry () */
|
|
cut_size = leaf_cut_entries(bh, ih, pos_in_item, cut_size);
|
|
if (pos_in_item == 0) {
|
|
/* change key */
|
|
RFALSE(cut_item_num,
|
|
"when 0-th enrty of item is cut, that item must be first in the node, not %d-th",
|
|
cut_item_num);
|
|
/* change item key by key of first entry in the item */
|
|
set_le_ih_k_offset(ih, deh_offset(B_I_DEH(bh, ih)));
|
|
}
|
|
} else {
|
|
/* item is direct or indirect */
|
|
RFALSE(is_statdata_le_ih(ih), "10195: item is stat data");
|
|
RFALSE(pos_in_item && pos_in_item + cut_size != ih_item_len(ih),
|
|
"10200: invalid offset (%lu) or trunc_size (%lu) or ih_item_len (%lu)",
|
|
(long unsigned)pos_in_item, (long unsigned)cut_size,
|
|
(long unsigned)ih_item_len(ih));
|
|
|
|
/* shift item body to left if cut is from the head of item */
|
|
if (pos_in_item == 0) {
|
|
memmove(bh->b_data + ih_location(ih),
|
|
bh->b_data + ih_location(ih) + cut_size,
|
|
ih_item_len(ih) - cut_size);
|
|
|
|
/* change key of item */
|
|
if (is_direct_le_ih(ih))
|
|
set_le_ih_k_offset(ih,
|
|
le_ih_k_offset(ih) +
|
|
cut_size);
|
|
else {
|
|
set_le_ih_k_offset(ih,
|
|
le_ih_k_offset(ih) +
|
|
(cut_size / UNFM_P_SIZE) *
|
|
bh->b_size);
|
|
RFALSE(ih_item_len(ih) == cut_size
|
|
&& get_ih_free_space(ih),
|
|
"10205: invalid ih_free_space (%h)", ih);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* location of the last item */
|
|
last_loc = ih_location(&ih[nr - cut_item_num - 1]);
|
|
|
|
/* location of the item, which is remaining at the same place */
|
|
unmoved_loc = cut_item_num ? ih_location(ih - 1) : bh->b_size;
|
|
|
|
/* shift */
|
|
memmove(bh->b_data + last_loc + cut_size, bh->b_data + last_loc,
|
|
unmoved_loc - last_loc - cut_size);
|
|
|
|
/* change item length */
|
|
put_ih_item_len(ih, ih_item_len(ih) - cut_size);
|
|
|
|
if (is_indirect_le_ih(ih)) {
|
|
if (pos_in_item)
|
|
set_ih_free_space(ih, 0);
|
|
}
|
|
|
|
/* change locations */
|
|
for (i = cut_item_num; i < nr; i++)
|
|
put_ih_location(&ih[i - cut_item_num],
|
|
ih_location(&ih[i - cut_item_num]) + cut_size);
|
|
|
|
/* size, free space */
|
|
set_blkh_free_space(blkh, blkh_free_space(blkh) + cut_size);
|
|
|
|
do_balance_mark_leaf_dirty(bi->tb, bh, 0);
|
|
|
|
if (bi->bi_parent) {
|
|
struct disk_child *t_dc;
|
|
t_dc = B_N_CHILD(bi->bi_parent, bi->bi_position);
|
|
put_dc_size(t_dc, dc_size(t_dc) - cut_size);
|
|
do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
|
|
}
|
|
}
|
|
|
|
/* delete del_num items from buffer starting from the first'th item */
|
|
static void leaf_delete_items_entirely(struct buffer_info *bi,
|
|
int first, int del_num)
|
|
{
|
|
struct buffer_head *bh = bi->bi_bh;
|
|
int nr;
|
|
int i, j;
|
|
int last_loc, last_removed_loc;
|
|
struct block_head *blkh;
|
|
struct item_head *ih;
|
|
|
|
RFALSE(bh == NULL, "10210: buffer is 0");
|
|
RFALSE(del_num < 0, "10215: del_num less than 0 (%d)", del_num);
|
|
|
|
if (del_num == 0)
|
|
return;
|
|
|
|
blkh = B_BLK_HEAD(bh);
|
|
nr = blkh_nr_item(blkh);
|
|
|
|
RFALSE(first < 0 || first + del_num > nr,
|
|
"10220: first=%d, number=%d, there is %d items", first, del_num,
|
|
nr);
|
|
|
|
if (first == 0 && del_num == nr) {
|
|
/* this does not work */
|
|
make_empty_node(bi);
|
|
|
|
do_balance_mark_leaf_dirty(bi->tb, bh, 0);
|
|
return;
|
|
}
|
|
|
|
ih = item_head(bh, first);
|
|
|
|
/* location of unmovable item */
|
|
j = (first == 0) ? bh->b_size : ih_location(ih - 1);
|
|
|
|
/* delete items */
|
|
last_loc = ih_location(&ih[nr - 1 - first]);
|
|
last_removed_loc = ih_location(&ih[del_num - 1]);
|
|
|
|
memmove(bh->b_data + last_loc + j - last_removed_loc,
|
|
bh->b_data + last_loc, last_removed_loc - last_loc);
|
|
|
|
/* delete item headers */
|
|
memmove(ih, ih + del_num, (nr - first - del_num) * IH_SIZE);
|
|
|
|
/* change item location */
|
|
for (i = first; i < nr - del_num; i++)
|
|
put_ih_location(&ih[i - first],
|
|
ih_location(&ih[i - first]) + (j -
|
|
last_removed_loc));
|
|
|
|
/* sizes, item number */
|
|
set_blkh_nr_item(blkh, blkh_nr_item(blkh) - del_num);
|
|
set_blkh_free_space(blkh,
|
|
blkh_free_space(blkh) + (j - last_removed_loc +
|
|
IH_SIZE * del_num));
|
|
|
|
do_balance_mark_leaf_dirty(bi->tb, bh, 0);
|
|
|
|
if (bi->bi_parent) {
|
|
struct disk_child *t_dc =
|
|
B_N_CHILD(bi->bi_parent, bi->bi_position);
|
|
put_dc_size(t_dc,
|
|
dc_size(t_dc) - (j - last_removed_loc +
|
|
IH_SIZE * del_num));
|
|
do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* paste new_entry_count entries (new_dehs, records) into position
|
|
* before to item_num-th item
|
|
*/
|
|
void leaf_paste_entries(struct buffer_info *bi,
|
|
int item_num,
|
|
int before,
|
|
int new_entry_count,
|
|
struct reiserfs_de_head *new_dehs,
|
|
const char *records, int paste_size)
|
|
{
|
|
struct item_head *ih;
|
|
char *item;
|
|
struct reiserfs_de_head *deh;
|
|
char *insert_point;
|
|
int i, old_entry_num;
|
|
struct buffer_head *bh = bi->bi_bh;
|
|
|
|
if (new_entry_count == 0)
|
|
return;
|
|
|
|
ih = item_head(bh, item_num);
|
|
|
|
/*
|
|
* make sure, that item is directory, and there are enough
|
|
* records in it
|
|
*/
|
|
RFALSE(!is_direntry_le_ih(ih), "10225: item is not directory item");
|
|
RFALSE(ih_entry_count(ih) < before,
|
|
"10230: there are no entry we paste entries before. entry_count = %d, before = %d",
|
|
ih_entry_count(ih), before);
|
|
|
|
/* first byte of dest item */
|
|
item = bh->b_data + ih_location(ih);
|
|
|
|
/* entry head array */
|
|
deh = B_I_DEH(bh, ih);
|
|
|
|
/* new records will be pasted at this point */
|
|
insert_point =
|
|
item +
|
|
(before ? deh_location(&deh[before - 1])
|
|
: (ih_item_len(ih) - paste_size));
|
|
|
|
/* adjust locations of records that will be AFTER new records */
|
|
for (i = ih_entry_count(ih) - 1; i >= before; i--)
|
|
put_deh_location(&deh[i],
|
|
deh_location(&deh[i]) +
|
|
(DEH_SIZE * new_entry_count));
|
|
|
|
/* adjust locations of records that will be BEFORE new records */
|
|
for (i = 0; i < before; i++)
|
|
put_deh_location(&deh[i],
|
|
deh_location(&deh[i]) + paste_size);
|
|
|
|
old_entry_num = ih_entry_count(ih);
|
|
put_ih_entry_count(ih, ih_entry_count(ih) + new_entry_count);
|
|
|
|
/* prepare space for pasted records */
|
|
memmove(insert_point + paste_size, insert_point,
|
|
item + (ih_item_len(ih) - paste_size) - insert_point);
|
|
|
|
/* copy new records */
|
|
memcpy(insert_point + DEH_SIZE * new_entry_count, records,
|
|
paste_size - DEH_SIZE * new_entry_count);
|
|
|
|
/* prepare space for new entry heads */
|
|
deh += before;
|
|
memmove((char *)(deh + new_entry_count), deh,
|
|
insert_point - (char *)deh);
|
|
|
|
/* copy new entry heads */
|
|
deh = (struct reiserfs_de_head *)((char *)deh);
|
|
memcpy(deh, new_dehs, DEH_SIZE * new_entry_count);
|
|
|
|
/* set locations of new records */
|
|
for (i = 0; i < new_entry_count; i++) {
|
|
put_deh_location(&deh[i],
|
|
deh_location(&deh[i]) +
|
|
(-deh_location
|
|
(&new_dehs[new_entry_count - 1]) +
|
|
insert_point + DEH_SIZE * new_entry_count -
|
|
item));
|
|
}
|
|
|
|
/* change item key if necessary (when we paste before 0-th entry */
|
|
if (!before) {
|
|
set_le_ih_k_offset(ih, deh_offset(new_dehs));
|
|
}
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
{
|
|
int prev, next;
|
|
/* check record locations */
|
|
deh = B_I_DEH(bh, ih);
|
|
for (i = 0; i < ih_entry_count(ih); i++) {
|
|
next =
|
|
(i <
|
|
ih_entry_count(ih) -
|
|
1) ? deh_location(&deh[i + 1]) : 0;
|
|
prev = (i != 0) ? deh_location(&deh[i - 1]) : 0;
|
|
|
|
if (prev && prev <= deh_location(&deh[i]))
|
|
reiserfs_error(sb_from_bi(bi), "vs-10240",
|
|
"directory item (%h) "
|
|
"corrupted (prev %a, "
|
|
"cur(%d) %a)",
|
|
ih, deh + i - 1, i, deh + i);
|
|
if (next && next >= deh_location(&deh[i]))
|
|
reiserfs_error(sb_from_bi(bi), "vs-10250",
|
|
"directory item (%h) "
|
|
"corrupted (cur(%d) %a, "
|
|
"next %a)",
|
|
ih, i, deh + i, deh + i + 1);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
}
|