mirror of https://gitee.com/openkylin/linux.git
790 lines
19 KiB
C
790 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 <linux/reiserfs_fs.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)(-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), 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,
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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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if (start_skip || end_skip)
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BUG ();
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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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if (count)
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BUG ();
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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, "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, 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,
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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, "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, 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;
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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, "indirect_print_item: 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,
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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, "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: direntry_bytes_number: "
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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, 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", "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 = (i ? (deh_location(deh - 1)) : ih_item_len(ih)) - 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)), 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, 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\'", 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,
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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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if (!(vi->vi_ih) || !vi->vi_item)
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BUG ();
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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, vn->vn_mode);
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dir_u->entry_sizes[i] = (j ? deh_location( &(deh[j - 1]) ) :
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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 && (vn->vn_mode == M_PASTE || vn->vn_mode == M_CUT)) ? insert_size : 0) ) {
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reiserfs_panic (NULL, "vs-8025: set_entry_sizes: (mode==%c, insert_size==%d), invalid length of directory item",
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vn->vn_mode, insert_size);
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}
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}
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#endif
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return size;
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}
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//
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// return number of entries which may fit into specified amount of
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// free space, or -1 if free space is not enough even for 1 entry
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//
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static int direntry_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 i;
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int entries = 0;
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struct direntry_uarea * dir_u = vi->vi_uarea;
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for (i = start_skip; i < dir_u->entry_count - end_skip; i ++) {
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if (dir_u->entry_sizes[i] > free)
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/* i-th entry doesn't fit into the remaining free space */
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break;
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free -= dir_u->entry_sizes[i];
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entries ++;
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}
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if (entries == dir_u->entry_count) {
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reiserfs_panic (NULL, "free space %d, entry_count %d\n", free, dir_u->entry_count);
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}
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/* "." and ".." can not be separated from each other */
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if (start_skip == 0 && (dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM) && entries < 2)
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entries = 0;
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return entries ?: -1;
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}
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static int direntry_check_right (struct virtual_item * vi, int free)
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{
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int i;
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int entries = 0;
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struct direntry_uarea * dir_u = vi->vi_uarea;
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for (i = dir_u->entry_count - 1; i >= 0; i --) {
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if (dir_u->entry_sizes[i] > free)
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/* i-th entry doesn't fit into the remaining free space */
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break;
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free -= dir_u->entry_sizes[i];
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entries ++;
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}
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if (entries == dir_u->entry_count)
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BUG ();
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/* "." and ".." can not be separated from each other */
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if ((dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM) && entries > dir_u->entry_count - 2)
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entries = dir_u->entry_count - 2;
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return entries ?: -1;
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}
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/* sum of entry sizes between from-th and to-th entries including both edges */
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static int direntry_part_size (struct virtual_item * vi, int first, int count)
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{
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int i, retval;
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int from, to;
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struct direntry_uarea * dir_u = vi->vi_uarea;
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retval = 0;
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if (first == 0)
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from = 0;
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else
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from = dir_u->entry_count - count;
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to = from + count - 1;
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for (i = from; i <= to; i ++)
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retval += dir_u->entry_sizes[i];
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return retval;
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}
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static int direntry_unit_num (struct virtual_item * vi)
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{
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struct direntry_uarea * dir_u = vi->vi_uarea;
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return dir_u->entry_count;
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}
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static void direntry_print_vi (struct virtual_item * vi)
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{
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int i;
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struct direntry_uarea * dir_u = vi->vi_uarea;
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reiserfs_warning (NULL, "DIRENTRY, index %d, type 0x%x, %h, flags 0x%x",
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vi->vi_index, vi->vi_type, vi->vi_ih, dir_u->flags);
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printk ("%d entries: ", dir_u->entry_count);
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for (i = 0; i < dir_u->entry_count; i ++)
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printk ("%d ", dir_u->entry_sizes[i]);
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printk ("\n");
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}
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static struct item_operations direntry_ops = {
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.bytes_number = direntry_bytes_number,
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.decrement_key = direntry_decrement_key,
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.is_left_mergeable = direntry_is_left_mergeable,
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.print_item = direntry_print_item,
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.check_item = direntry_check_item,
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.create_vi = direntry_create_vi,
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.check_left = direntry_check_left,
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.check_right = direntry_check_right,
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.part_size = direntry_part_size,
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.unit_num = direntry_unit_num,
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.print_vi = direntry_print_vi
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};
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|
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//////////////////////////////////////////////////////////////////////////////
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// Error catching functions to catch errors caused by incorrect item types.
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//
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static int errcatch_bytes_number (struct item_head * ih, int block_size)
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{
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reiserfs_warning (NULL, "green-16001: Invalid item type observed, run fsck ASAP");
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return 0;
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}
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static void errcatch_decrement_key (struct cpu_key * key)
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{
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reiserfs_warning (NULL, "green-16002: Invalid item type observed, run fsck ASAP");
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}
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static int errcatch_is_left_mergeable (struct reiserfs_key * key, unsigned long bsize)
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{
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reiserfs_warning (NULL, "green-16003: Invalid item type observed, run fsck ASAP");
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return 0;
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}
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static void errcatch_print_item (struct item_head * ih, char * item)
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{
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reiserfs_warning (NULL, "green-16004: Invalid item type observed, run fsck ASAP");
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}
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static void errcatch_check_item (struct item_head * ih, char * item)
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{
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reiserfs_warning (NULL, "green-16005: Invalid item type observed, run fsck ASAP");
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}
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static int errcatch_create_vi (struct virtual_node * vn,
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struct virtual_item * vi,
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int is_affected,
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int insert_size)
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{
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reiserfs_warning (NULL, "green-16006: Invalid item type observed, run fsck ASAP");
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return 0; // We might return -1 here as well, but it won't help as create_virtual_node() from where
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// this operation is called from is of return type void.
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}
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static int errcatch_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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reiserfs_warning (NULL, "green-16007: Invalid item type observed, run fsck ASAP");
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return -1;
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}
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|
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static int errcatch_check_right (struct virtual_item * vi, int free)
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{
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reiserfs_warning (NULL, "green-16008: Invalid item type observed, run fsck ASAP");
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return -1;
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}
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static int errcatch_part_size (struct virtual_item * vi, int first, int count)
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|
{
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|
reiserfs_warning (NULL, "green-16009: Invalid item type observed, run fsck ASAP");
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|
return 0;
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}
|
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static int errcatch_unit_num (struct virtual_item * vi)
|
|
{
|
|
reiserfs_warning (NULL, "green-16010: Invalid item type observed, run fsck ASAP");
|
|
return 0;
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|
}
|
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|
|
static void errcatch_print_vi (struct virtual_item * vi)
|
|
{
|
|
reiserfs_warning (NULL, "green-16011: Invalid item type observed, run fsck ASAP");
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|
}
|
|
|
|
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)
|
|
do not compile
|
|
#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) */
|
|
};
|
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|
|
|
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|