mail-index-fsck.c revision 3697080532ccd9f51fac108be6079b616c7a2ddf
/* Copyright (C) 2004-2007 Timo Sirainen */
#include "lib.h"
#include "ioloop.h"
#include "mail-index-private.h"
#include "mail-transaction-log.h"
static void mail_index_fsck_error(struct mail_index *index,
const char *fmt, ...) __attr_format__(2, 3);
static void mail_index_fsck_error(struct mail_index *index,
const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
mail_index_set_error(index, "Fixed index file %s: %s",
index->filepath, t_strdup_vprintf(fmt, va));
va_end(va);
}
#define CHECK(field, oper) \
if (hdr.field oper map->hdr.field) { \
mail_index_fsck_error(index, #field" %u -> %u", \
map->hdr.field, hdr.field); \
}
static int
mail_index_fsck_map(struct mail_index *index, struct mail_index_map *map,
bool *lock, const char **error_r)
{
struct mail_index_header hdr;
const struct mail_index_record *rec;
uint32_t file_seq;
uoff_t file_offset;
uint32_t i, last_uid;
*error_r = NULL;
if (*lock) {
if (mail_transaction_log_sync_lock(index->log, &file_seq,
&file_offset) < 0) {
*lock = FALSE;
return -1;
}
} else {
mail_transaction_log_get_head(index->log, &file_seq,
&file_offset);
}
/* Remember the log head position. If we go back in the index's head
offset, ignore errors in the log up to this offset. */
index->fsck_log_head_file_seq = file_seq;
index->fsck_log_head_file_offset = file_offset;
/* locking already does the most important sanity checks for header */
hdr = map->hdr;
if (hdr.uid_validity == 0 && hdr.next_uid != 1)
hdr.uid_validity = ioloop_time;
hdr.flags &= ~MAIL_INDEX_HDR_FLAG_FSCK;
if (hdr.log_file_seq < file_seq) {
hdr.log_file_head_offset = hdr.log_file_tail_offset =
sizeof(struct mail_transaction_log_header);
} else {
if (hdr.log_file_head_offset > file_offset)
hdr.log_file_head_offset = file_offset;
if (hdr.log_file_tail_offset > hdr.log_file_head_offset)
hdr.log_file_tail_offset = hdr.log_file_head_offset;
}
hdr.log_file_seq = file_seq;
hdr.messages_count = 0;
hdr.seen_messages_count = 0;
hdr.deleted_messages_count = 0;
hdr.first_unseen_uid_lowwater = 0;
hdr.first_deleted_uid_lowwater = 0;
rec = map->rec_map->records; last_uid = 0;
for (i = 0; i < map->rec_map->records_count; i++) {
if (rec->uid <= last_uid) {
*error_r = "Record UIDs are not ordered";
return 0;
}
hdr.messages_count++;
if ((rec->flags & MAIL_SEEN) != 0)
hdr.seen_messages_count++;
if ((rec->flags & MAIL_DELETED) != 0)
hdr.deleted_messages_count++;
if ((rec->flags & MAIL_SEEN) == 0 &&
hdr.first_unseen_uid_lowwater == 0)
hdr.first_unseen_uid_lowwater = rec->uid;
if ((rec->flags & MAIL_DELETED) != 0 &&
hdr.first_deleted_uid_lowwater == 0)
hdr.first_deleted_uid_lowwater = rec->uid;
last_uid = rec->uid;
rec = CONST_PTR_OFFSET(rec, hdr.record_size);
}
if (hdr.next_uid <= last_uid) {
mail_index_fsck_error(index, "next_uid %u -> %u",
hdr.next_uid, last_uid+1);
hdr.next_uid = last_uid+1;
}
if (hdr.first_unseen_uid_lowwater == 0)
hdr.first_unseen_uid_lowwater = hdr.next_uid;
if (hdr.first_deleted_uid_lowwater == 0)
hdr.first_deleted_uid_lowwater = hdr.next_uid;
if (hdr.first_recent_uid > hdr.next_uid)
hdr.first_recent_uid = hdr.next_uid;
if (hdr.first_recent_uid == 0)
hdr.first_recent_uid = 1;
CHECK(log_file_seq, !=);
CHECK(log_file_head_offset, !=);
CHECK(log_file_tail_offset, !=);
CHECK(uid_validity, !=);
CHECK(messages_count, !=);
CHECK(seen_messages_count, !=);
CHECK(deleted_messages_count, !=);
CHECK(first_unseen_uid_lowwater, <);
CHECK(first_deleted_uid_lowwater, <);
CHECK(first_recent_uid, !=);
map->hdr = hdr;
return 1;
}
int mail_index_fsck(struct mail_index *index)
{
const char *error = NULL;
struct mail_index_map *map;
bool lock = !index->log_locked;
int ret;
i_warning("fscking index file %s", index->filepath);
map = mail_index_map_clone(index->map);
mail_index_unmap(&index->map);
index->map = map;
ret = mail_index_fsck_map(index, map, &lock, &error);
if (ret > 0) {
map->write_base_header = TRUE;
map->write_atomic = TRUE;
mail_index_write(index, FALSE);
}
if (error != NULL) {
mail_index_set_error(index, "Corrupted index file %s: %s",
index->filepath, error);
}
if (ret == 0)
mail_index_mark_corrupted(index);
if (lock)
mail_transaction_log_sync_unlock(index->log);
return ret;
}