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/* Copyright (c) 2007-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "mail-cache.h"
#include "mail-index-modseq.h"
#include "mailbox-list-private.h"
#include "mailbox-recent-flags.h"
#include "index-storage.h"
#include "index-rebuild.h"
static void
index_index_copy_vsize(struct index_rebuild_context *ctx,
struct mail_index_view *view,
uint32_t old_seq, uint32_t new_seq)
{
const void *data;
bool expunged;
mail_index_lookup_ext(view, old_seq, ctx->box->mail_vsize_ext_id,
&data, &expunged);
if (data != NULL && !expunged) {
mail_index_update_ext(ctx->trans, new_seq,
ctx->box->mail_vsize_ext_id, data, NULL);
}
}
static void
index_index_copy_cache(struct index_rebuild_context *ctx,
struct mail_index_view *view,
uint32_t old_seq, uint32_t new_seq)
{
struct mail_index_map *map;
const void *data;
uint32_t reset_id = 0;
bool expunged;
if (ctx->cache_ext_id == (uint32_t)-1)
return;
mail_index_lookup_ext_full(view, old_seq, ctx->cache_ext_id,
&map, &data, &expunged);
if (expunged)
return;
if (!mail_index_ext_get_reset_id(view, map, ctx->cache_ext_id,
&reset_id) || reset_id == 0)
return;
if (!ctx->cache_used) {
/* set reset id */
ctx->cache_used = TRUE;
ctx->cache_reset_id = reset_id;
mail_index_ext_reset(ctx->trans, ctx->cache_ext_id,
ctx->cache_reset_id, TRUE);
}
if (ctx->cache_reset_id == reset_id) {
mail_index_update_ext(ctx->trans, new_seq,
ctx->cache_ext_id, data, NULL);
}
}
static void
index_index_copy_from_old(struct index_rebuild_context *ctx,
struct mail_index_view *view,
uint32_t old_seq, uint32_t new_seq)
{
struct mail_index *index = mail_index_view_get_index(view);
const struct mail_index_record *rec;
ARRAY_TYPE(keyword_indexes) old_keywords;
struct mail_keywords *kw;
uint64_t modseq;
/* copy flags */
rec = mail_index_lookup(view, old_seq);
mail_index_update_flags(ctx->trans, new_seq,
MODIFY_REPLACE, rec->flags);
/* copy keywords */
t_array_init(&old_keywords, 32);
mail_index_lookup_keywords(view, old_seq, &old_keywords);
kw = mail_index_keywords_create_from_indexes(index, &old_keywords);
mail_index_update_keywords(ctx->trans, new_seq, MODIFY_REPLACE, kw);
mail_index_keywords_unref(&kw);
/* copy modseq */
modseq = mail_index_modseq_lookup(view, old_seq);
mail_index_update_modseq(ctx->trans, new_seq, modseq);
index_index_copy_vsize(ctx, view, old_seq, new_seq);
index_index_copy_cache(ctx, view, old_seq, new_seq);
}
void index_rebuild_index_metadata(struct index_rebuild_context *ctx,
uint32_t new_seq, uint32_t uid)
{
uint32_t old_seq;
if (mail_index_lookup_seq(ctx->view, uid, &old_seq)) {
/* the message exists in the old index.
copy the metadata from it. */
index_index_copy_from_old(ctx, ctx->view, old_seq, new_seq);
} else if (ctx->backup_view != NULL &&
mail_index_lookup_seq(ctx->backup_view, uid, &old_seq)) {
/* copy the metadata from backup index. */
index_index_copy_from_old(ctx, ctx->backup_view,
old_seq, new_seq);
}
}
static void
index_rebuild_header(struct index_rebuild_context *ctx,
index_rebuild_generate_uidvalidity_t *gen_uidvalidity)
{
const struct mail_index_header *hdr, *backup_hdr, *trans_hdr;
struct mail_index *index = mail_index_view_get_index(ctx->view);
struct mail_index_modseq_header modseq_hdr;
struct mail_index_view *trans_view;
uint32_t uid_validity, next_uid, first_recent_uid;
uint64_t modseq;
hdr = mail_index_get_header(ctx->view);
backup_hdr = ctx->backup_view == NULL ? NULL :
mail_index_get_header(ctx->backup_view);
trans_view = mail_index_transaction_open_updated_view(ctx->trans);
trans_hdr = mail_index_get_header(trans_view);
/* set uidvalidity */
if (hdr->uid_validity != 0)
uid_validity = hdr->uid_validity;
else if (backup_hdr != NULL && backup_hdr->uid_validity != 0)
uid_validity = backup_hdr->uid_validity;
else
uid_validity = gen_uidvalidity(ctx->box->list);
mail_index_update_header(ctx->trans,
offsetof(struct mail_index_header, uid_validity),
&uid_validity, sizeof(uid_validity), TRUE);
/* set next-uid */
if (hdr->next_uid != 0)
next_uid = hdr->next_uid;
else if (backup_hdr != NULL && backup_hdr->next_uid != 0)
next_uid = backup_hdr->next_uid;
else
next_uid = 1;
if (next_uid > trans_hdr->next_uid) {
mail_index_update_header(ctx->trans,
offsetof(struct mail_index_header, next_uid),
&next_uid, sizeof(next_uid), FALSE);
}
/* set first_recent_uid */
first_recent_uid = hdr->first_recent_uid;
if (backup_hdr != NULL &&
backup_hdr->first_recent_uid > first_recent_uid &&
backup_hdr->first_recent_uid <= next_uid)
first_recent_uid = backup_hdr->first_recent_uid;
first_recent_uid = I_MIN(first_recent_uid, next_uid);
mail_index_update_header(ctx->trans,
offsetof(struct mail_index_header, first_recent_uid),
&first_recent_uid, sizeof(first_recent_uid), FALSE);
/* set highest-modseq */
i_zero(&modseq_hdr);
modseq_hdr.highest_modseq = mail_index_modseq_get_highest(ctx->view);
if (ctx->backup_view != NULL) {
modseq = mail_index_modseq_get_highest(ctx->backup_view);
if (modseq_hdr.highest_modseq < modseq)
modseq_hdr.highest_modseq = modseq;
}
mail_index_update_header_ext(ctx->trans, index->modseq_ext_id,
0, &modseq_hdr, sizeof(modseq_hdr));
mail_index_view_close(&trans_view);
}
static void
index_rebuild_box_preserve_header(struct index_rebuild_context *ctx,
uint32_t ext_id)
{
const void *hdr;
size_t hdr_size;
mail_index_get_header_ext(ctx->view, ext_id, &hdr, &hdr_size);
if (hdr_size == 0 && ctx->backup_view != NULL) {
mail_index_get_header_ext(ctx->backup_view, ext_id,
&hdr, &hdr_size);
}
if (hdr_size == 0)
return;
mail_index_update_header_ext(ctx->trans, ext_id, 0, hdr, hdr_size);
}
struct index_rebuild_context *
index_index_rebuild_init(struct mailbox *box, struct mail_index_view *view,
struct mail_index_transaction *trans)
{
struct index_rebuild_context *ctx;
const char *index_dir, *backup_path;
enum mail_index_open_flags open_flags = MAIL_INDEX_OPEN_FLAG_READONLY;
/* Rebuilding really should be done locked so multiple processes won't
try to rebuild concurrently. Also at the end of rebiuld cache
purging requires this lock. */
i_assert(mail_index_is_locked(view->index));
ctx = i_new(struct index_rebuild_context, 1);
ctx->box = box;
ctx->view = view;
ctx->trans = trans;
mail_index_reset(ctx->trans);
mailbox_recent_flags_reset(box);
(void)mail_index_ext_lookup(box->index, "cache", &ctx->cache_ext_id);
/* open cache and read the caching decisions. */
(void)mail_cache_open_and_verify(ctx->box->cache);
/* if backup index file exists, try to use it */
index_dir = mailbox_get_index_path(box);
backup_path = t_strconcat(box->index_prefix, ".backup", NULL);
ctx->backup_index = mail_index_alloc(box->event,
index_dir, backup_path);
#ifndef MMAP_CONFLICTS_WRITE
if (box->storage->set->mmap_disable)
#endif
open_flags |= MAIL_INDEX_OPEN_FLAG_MMAP_DISABLE;
mail_index_set_lock_method(ctx->backup_index,
box->storage->set->parsed_lock_method,
UINT_MAX);
if (mail_index_open(ctx->backup_index, open_flags) <= 0)
mail_index_free(&ctx->backup_index);
else
ctx->backup_view = mail_index_view_open(ctx->backup_index);
return ctx;
}
void index_index_rebuild_deinit(struct index_rebuild_context **_ctx,
index_rebuild_generate_uidvalidity_t *cb)
{
struct index_rebuild_context *ctx = *_ctx;
*_ctx = NULL;
/* initialize cache file with the old field decisions */
(void)mail_cache_purge_with_trans(ctx->box->cache, ctx->trans,
(uint32_t)-1, "rebuilding index");
index_rebuild_header(ctx, cb);
index_rebuild_box_preserve_header(ctx, ctx->box->box_name_hdr_ext_id);
index_rebuild_box_preserve_header(ctx, ctx->box->box_last_rename_stamp_ext_id);
index_rebuild_box_preserve_header(ctx, ctx->box->pop3_uidl_hdr_ext_id);
if (ctx->backup_index != NULL) {
mail_index_view_close(&ctx->backup_view);
mail_index_close(ctx->backup_index);
mail_index_free(&ctx->backup_index);
}
i_free(ctx);
}
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