mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-10-31 08:44:41 +00:00
756 lines
19 KiB
C
756 lines
19 KiB
C
/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*/
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#include <linux/time.h>
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#include "reiserfs.h"
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// this contains item handlers for old item types: sd, direct,
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// indirect, directory
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/* and where are the comments? how about saying where we can find an
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explanation of each item handler method? -Hans */
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//////////////////////////////////////////////////////////////////////////////
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// stat data functions
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//
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static int sd_bytes_number(struct item_head *ih, int block_size)
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{
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return 0;
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}
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static void sd_decrement_key(struct cpu_key *key)
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{
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key->on_disk_key.k_objectid--;
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set_cpu_key_k_type(key, TYPE_ANY);
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set_cpu_key_k_offset(key, (loff_t)(~0ULL >> 1));
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}
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static int sd_is_left_mergeable(struct reiserfs_key *key, unsigned long bsize)
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{
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return 0;
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}
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static char *print_time(time_t t)
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{
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static char timebuf[256];
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sprintf(timebuf, "%ld", t);
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return timebuf;
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}
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static void sd_print_item(struct item_head *ih, char *item)
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{
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printk("\tmode | size | nlinks | first direct | mtime\n");
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if (stat_data_v1(ih)) {
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struct stat_data_v1 *sd = (struct stat_data_v1 *)item;
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printk("\t0%-6o | %6u | %2u | %d | %s\n", sd_v1_mode(sd),
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sd_v1_size(sd), sd_v1_nlink(sd),
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sd_v1_first_direct_byte(sd),
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print_time(sd_v1_mtime(sd)));
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} else {
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struct stat_data *sd = (struct stat_data *)item;
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printk("\t0%-6o | %6Lu | %2u | %d | %s\n", sd_v2_mode(sd),
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(unsigned long long)sd_v2_size(sd), sd_v2_nlink(sd),
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sd_v2_rdev(sd), print_time(sd_v2_mtime(sd)));
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}
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}
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static void sd_check_item(struct item_head *ih, char *item)
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{
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// FIXME: type something here!
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}
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static int sd_create_vi(struct virtual_node *vn,
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struct virtual_item *vi,
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int is_affected, int insert_size)
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{
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vi->vi_index = TYPE_STAT_DATA;
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//vi->vi_type |= VI_TYPE_STAT_DATA;// not needed?
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return 0;
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}
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static int sd_check_left(struct virtual_item *vi, int free,
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int start_skip, int end_skip)
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{
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BUG_ON(start_skip || end_skip);
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return -1;
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}
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static int sd_check_right(struct virtual_item *vi, int free)
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{
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return -1;
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}
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static int sd_part_size(struct virtual_item *vi, int first, int count)
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{
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BUG_ON(count);
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return 0;
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}
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static int sd_unit_num(struct virtual_item *vi)
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{
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return vi->vi_item_len - IH_SIZE;
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}
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static void sd_print_vi(struct virtual_item *vi)
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{
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reiserfs_warning(NULL, "reiserfs-16100",
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"STATDATA, index %d, type 0x%x, %h",
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vi->vi_index, vi->vi_type, vi->vi_ih);
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}
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static struct item_operations stat_data_ops = {
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.bytes_number = sd_bytes_number,
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.decrement_key = sd_decrement_key,
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.is_left_mergeable = sd_is_left_mergeable,
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.print_item = sd_print_item,
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.check_item = sd_check_item,
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.create_vi = sd_create_vi,
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.check_left = sd_check_left,
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.check_right = sd_check_right,
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.part_size = sd_part_size,
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.unit_num = sd_unit_num,
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.print_vi = sd_print_vi
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};
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//////////////////////////////////////////////////////////////////////////////
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// direct item functions
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//
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static int direct_bytes_number(struct item_head *ih, int block_size)
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{
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return ih_item_len(ih);
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}
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// FIXME: this should probably switch to indirect as well
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static void direct_decrement_key(struct cpu_key *key)
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{
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cpu_key_k_offset_dec(key);
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if (cpu_key_k_offset(key) == 0)
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set_cpu_key_k_type(key, TYPE_STAT_DATA);
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}
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static int direct_is_left_mergeable(struct reiserfs_key *key,
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unsigned long bsize)
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{
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int version = le_key_version(key);
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return ((le_key_k_offset(version, key) & (bsize - 1)) != 1);
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}
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static void direct_print_item(struct item_head *ih, char *item)
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{
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int j = 0;
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// return;
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printk("\"");
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while (j < ih_item_len(ih))
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printk("%c", item[j++]);
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printk("\"\n");
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}
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static void direct_check_item(struct item_head *ih, char *item)
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{
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// FIXME: type something here!
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}
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static int direct_create_vi(struct virtual_node *vn,
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struct virtual_item *vi,
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int is_affected, int insert_size)
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{
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vi->vi_index = TYPE_DIRECT;
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//vi->vi_type |= VI_TYPE_DIRECT;
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return 0;
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}
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static int direct_check_left(struct virtual_item *vi, int free,
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int start_skip, int end_skip)
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{
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int bytes;
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bytes = free - free % 8;
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return bytes ? : -1;
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}
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static int direct_check_right(struct virtual_item *vi, int free)
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{
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return direct_check_left(vi, free, 0, 0);
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}
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static int direct_part_size(struct virtual_item *vi, int first, int count)
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{
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return count;
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}
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static int direct_unit_num(struct virtual_item *vi)
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{
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return vi->vi_item_len - IH_SIZE;
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}
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static void direct_print_vi(struct virtual_item *vi)
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{
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reiserfs_warning(NULL, "reiserfs-16101",
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"DIRECT, index %d, type 0x%x, %h",
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vi->vi_index, vi->vi_type, vi->vi_ih);
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}
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static struct item_operations direct_ops = {
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.bytes_number = direct_bytes_number,
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.decrement_key = direct_decrement_key,
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.is_left_mergeable = direct_is_left_mergeable,
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.print_item = direct_print_item,
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.check_item = direct_check_item,
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.create_vi = direct_create_vi,
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.check_left = direct_check_left,
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.check_right = direct_check_right,
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.part_size = direct_part_size,
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.unit_num = direct_unit_num,
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.print_vi = direct_print_vi
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};
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//////////////////////////////////////////////////////////////////////////////
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// indirect item functions
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//
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static int indirect_bytes_number(struct item_head *ih, int block_size)
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{
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return ih_item_len(ih) / UNFM_P_SIZE * block_size; //- get_ih_free_space (ih);
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}
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// decrease offset, if it becomes 0, change type to stat data
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static void indirect_decrement_key(struct cpu_key *key)
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{
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cpu_key_k_offset_dec(key);
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if (cpu_key_k_offset(key) == 0)
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set_cpu_key_k_type(key, TYPE_STAT_DATA);
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}
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// if it is not first item of the body, then it is mergeable
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static int indirect_is_left_mergeable(struct reiserfs_key *key,
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unsigned long bsize)
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{
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int version = le_key_version(key);
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return (le_key_k_offset(version, key) != 1);
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}
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// printing of indirect item
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static void start_new_sequence(__u32 * start, int *len, __u32 new)
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{
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*start = new;
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*len = 1;
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}
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static int sequence_finished(__u32 start, int *len, __u32 new)
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{
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if (start == INT_MAX)
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return 1;
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if (start == 0 && new == 0) {
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(*len)++;
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return 0;
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}
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if (start != 0 && (start + *len) == new) {
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(*len)++;
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return 0;
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}
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return 1;
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}
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static void print_sequence(__u32 start, int len)
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{
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if (start == INT_MAX)
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return;
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if (len == 1)
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printk(" %d", start);
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else
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printk(" %d(%d)", start, len);
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}
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static void indirect_print_item(struct item_head *ih, char *item)
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{
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int j;
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__le32 *unp;
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__u32 prev = INT_MAX;
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int num = 0;
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unp = (__le32 *) item;
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if (ih_item_len(ih) % UNFM_P_SIZE)
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reiserfs_warning(NULL, "reiserfs-16102", "invalid item len");
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printk("%d pointers\n[ ", (int)I_UNFM_NUM(ih));
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for (j = 0; j < I_UNFM_NUM(ih); j++) {
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if (sequence_finished(prev, &num, get_block_num(unp, j))) {
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print_sequence(prev, num);
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start_new_sequence(&prev, &num, get_block_num(unp, j));
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}
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}
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print_sequence(prev, num);
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printk("]\n");
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}
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static void indirect_check_item(struct item_head *ih, char *item)
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{
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// FIXME: type something here!
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}
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static int indirect_create_vi(struct virtual_node *vn,
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struct virtual_item *vi,
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int is_affected, int insert_size)
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{
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vi->vi_index = TYPE_INDIRECT;
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//vi->vi_type |= VI_TYPE_INDIRECT;
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return 0;
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}
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static int indirect_check_left(struct virtual_item *vi, int free,
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int start_skip, int end_skip)
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{
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int bytes;
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bytes = free - free % UNFM_P_SIZE;
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return bytes ? : -1;
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}
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static int indirect_check_right(struct virtual_item *vi, int free)
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{
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return indirect_check_left(vi, free, 0, 0);
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}
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// return size in bytes of 'units' units. If first == 0 - calculate from the head (left), otherwise - from tail (right)
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static int indirect_part_size(struct virtual_item *vi, int first, int units)
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{
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// unit of indirect item is byte (yet)
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return units;
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}
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static int indirect_unit_num(struct virtual_item *vi)
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{
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// unit of indirect item is byte (yet)
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return vi->vi_item_len - IH_SIZE;
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}
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static void indirect_print_vi(struct virtual_item *vi)
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{
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reiserfs_warning(NULL, "reiserfs-16103",
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"INDIRECT, index %d, type 0x%x, %h",
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vi->vi_index, vi->vi_type, vi->vi_ih);
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}
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static struct item_operations indirect_ops = {
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.bytes_number = indirect_bytes_number,
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.decrement_key = indirect_decrement_key,
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.is_left_mergeable = indirect_is_left_mergeable,
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.print_item = indirect_print_item,
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.check_item = indirect_check_item,
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.create_vi = indirect_create_vi,
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.check_left = indirect_check_left,
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.check_right = indirect_check_right,
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.part_size = indirect_part_size,
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.unit_num = indirect_unit_num,
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.print_vi = indirect_print_vi
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};
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//////////////////////////////////////////////////////////////////////////////
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// direntry functions
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//
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static int direntry_bytes_number(struct item_head *ih, int block_size)
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{
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reiserfs_warning(NULL, "vs-16090",
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"bytes number is asked for direntry");
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return 0;
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}
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static void direntry_decrement_key(struct cpu_key *key)
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{
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cpu_key_k_offset_dec(key);
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if (cpu_key_k_offset(key) == 0)
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set_cpu_key_k_type(key, TYPE_STAT_DATA);
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}
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static int direntry_is_left_mergeable(struct reiserfs_key *key,
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unsigned long bsize)
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{
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if (le32_to_cpu(key->u.k_offset_v1.k_offset) == DOT_OFFSET)
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return 0;
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return 1;
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}
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static void direntry_print_item(struct item_head *ih, char *item)
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{
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int i;
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int namelen;
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struct reiserfs_de_head *deh;
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char *name;
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static char namebuf[80];
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printk("\n # %-15s%-30s%-15s%-15s%-15s\n", "Name",
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"Key of pointed object", "Hash", "Gen number", "Status");
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deh = (struct reiserfs_de_head *)item;
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for (i = 0; i < I_ENTRY_COUNT(ih); i++, deh++) {
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namelen =
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(i ? (deh_location(deh - 1)) : ih_item_len(ih)) -
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deh_location(deh);
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name = item + deh_location(deh);
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if (name[namelen - 1] == 0)
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namelen = strlen(name);
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namebuf[0] = '"';
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if (namelen > sizeof(namebuf) - 3) {
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strncpy(namebuf + 1, name, sizeof(namebuf) - 3);
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namebuf[sizeof(namebuf) - 2] = '"';
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namebuf[sizeof(namebuf) - 1] = 0;
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} else {
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memcpy(namebuf + 1, name, namelen);
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namebuf[namelen + 1] = '"';
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namebuf[namelen + 2] = 0;
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}
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printk("%d: %-15s%-15d%-15d%-15Ld%-15Ld(%s)\n",
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i, namebuf,
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deh_dir_id(deh), deh_objectid(deh),
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GET_HASH_VALUE(deh_offset(deh)),
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GET_GENERATION_NUMBER((deh_offset(deh))),
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(de_hidden(deh)) ? "HIDDEN" : "VISIBLE");
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}
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}
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static void direntry_check_item(struct item_head *ih, char *item)
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{
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int i;
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struct reiserfs_de_head *deh;
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// FIXME: type something here!
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deh = (struct reiserfs_de_head *)item;
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for (i = 0; i < I_ENTRY_COUNT(ih); i++, deh++) {
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;
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}
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}
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#define DIRENTRY_VI_FIRST_DIRENTRY_ITEM 1
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/*
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* function returns old entry number in directory item in real node
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* using new entry number in virtual item in virtual node */
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static inline int old_entry_num(int is_affected, int virtual_entry_num,
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int pos_in_item, int mode)
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{
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if (mode == M_INSERT || mode == M_DELETE)
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return virtual_entry_num;
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if (!is_affected)
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/* cut or paste is applied to another item */
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return virtual_entry_num;
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if (virtual_entry_num < pos_in_item)
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return virtual_entry_num;
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if (mode == M_CUT)
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return virtual_entry_num + 1;
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RFALSE(mode != M_PASTE || virtual_entry_num == 0,
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"vs-8015: old_entry_num: mode must be M_PASTE (mode = \'%c\'",
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mode);
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return virtual_entry_num - 1;
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}
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/* Create an array of sizes of directory entries for virtual
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item. Return space used by an item. FIXME: no control over
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consuming of space used by this item handler */
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static int direntry_create_vi(struct virtual_node *vn,
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struct virtual_item *vi,
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int is_affected, int insert_size)
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{
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struct direntry_uarea *dir_u = vi->vi_uarea;
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int i, j;
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int size = sizeof(struct direntry_uarea);
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struct reiserfs_de_head *deh;
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vi->vi_index = TYPE_DIRENTRY;
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BUG_ON(!(vi->vi_ih) || !vi->vi_item);
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dir_u->flags = 0;
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if (le_ih_k_offset(vi->vi_ih) == DOT_OFFSET)
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dir_u->flags |= DIRENTRY_VI_FIRST_DIRENTRY_ITEM;
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deh = (struct reiserfs_de_head *)(vi->vi_item);
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/* virtual directory item have this amount of entry after */
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dir_u->entry_count = ih_entry_count(vi->vi_ih) +
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((is_affected) ? ((vn->vn_mode == M_CUT) ? -1 :
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(vn->vn_mode == M_PASTE ? 1 : 0)) : 0);
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for (i = 0; i < dir_u->entry_count; i++) {
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j = old_entry_num(is_affected, i, vn->vn_pos_in_item,
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vn->vn_mode);
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dir_u->entry_sizes[i] =
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(j ? deh_location(&(deh[j - 1])) : ih_item_len(vi->vi_ih)) -
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deh_location(&(deh[j])) + DEH_SIZE;
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}
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size += (dir_u->entry_count * sizeof(short));
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/* set size of pasted entry */
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if (is_affected && vn->vn_mode == M_PASTE)
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dir_u->entry_sizes[vn->vn_pos_in_item] = insert_size;
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#ifdef CONFIG_REISERFS_CHECK
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/* compare total size of entries with item length */
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{
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int k, l;
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l = 0;
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for (k = 0; k < dir_u->entry_count; k++)
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l += dir_u->entry_sizes[k];
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if (l + IH_SIZE != vi->vi_item_len +
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((is_affected
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&& (vn->vn_mode == M_PASTE
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|| 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++) {
|
|
if (dir_u->entry_sizes[i] > free)
|
|
/* i-th entry doesn't fit into the remaining free space */
|
|
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--) {
|
|
if (dir_u->entry_sizes[i] > free)
|
|
/* i-th entry doesn't fit into the remaining free space */
|
|
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");
|
|
return 0; // 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.
|
|
}
|
|
|
|
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 = {
|
|
errcatch_bytes_number,
|
|
errcatch_decrement_key,
|
|
errcatch_is_left_mergeable,
|
|
errcatch_print_item,
|
|
errcatch_check_item,
|
|
|
|
errcatch_create_vi,
|
|
errcatch_check_left,
|
|
errcatch_check_right,
|
|
errcatch_part_size,
|
|
errcatch_unit_num,
|
|
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) */
|
|
};
|