Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib-storage/index/index-storage.c @ 3912:fc0b638330a4 HEAD
Added mbox_min_index_size setting.
author | Timo Sirainen <tss@iki.fi> |
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date | Thu, 19 Jan 2006 01:14:43 +0200 |
parents | 411f20e72a8f |
children | cd701884900c |
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/* Copyright (C) 2002-2003 Timo Sirainen */ #include "lib.h" #include "array.h" #include "buffer.h" #include "ioloop.h" #include "mail-index-private.h" #include "index-storage.h" #include "index-mail.h" #include <stdlib.h> #include <time.h> #include <unistd.h> #include <sys/stat.h> #define DEFAULT_CACHE_FIELDS "flags" #define DEFAULT_NEVER_CACHE_FIELDS "imap.envelope" /* How many seconds to keep index opened for reuse after it's been closed */ #define INDEX_CACHE_TIMEOUT 10 /* How many closed indexes to keep */ #define INDEX_CACHE_MAX 3 #define LOCK_NOTIFY_INTERVAL 30 struct index_list { struct index_list *next; struct mail_index *index; char *mailbox_path; int refcount; dev_t index_dir_dev; ino_t index_dir_ino; time_t destroy_time; }; static struct index_list *indexes = NULL; static struct timeout *to_index = NULL; static int index_storage_refcount = 0; void index_storage_init(struct index_storage *storage, enum mail_storage_flags flags, enum mail_storage_lock_method lock_method) { storage->storage.flags = flags; storage->storage.lock_method = lock_method; array_create(&storage->storage.module_contexts, storage->storage.pool, sizeof(void *), 5); index_storage_refcount++; } void index_storage_deinit(struct index_storage *storage) { i_free(storage->storage.error); if (--index_storage_refcount > 0) return; index_storage_destroy_unrefed(); } static void index_storage_add(struct mail_index *index, const char *mailbox_path, struct stat *st) { struct index_list *list; list = i_new(struct index_list, 1); list->refcount = 1; list->index = index; list->mailbox_path = i_strdup(mailbox_path); list->index_dir_dev = st->st_dev; list->index_dir_ino = st->st_ino; list->next = indexes; indexes = list; } static void index_list_free(struct index_list *list) { mail_index_free(&list->index); i_free(list->mailbox_path); i_free(list); } struct mail_index * index_storage_alloc(const char *index_dir, const char *mailbox_path, const char *prefix) { struct index_list **list, *rec; struct mail_index *index; struct stat st, st2; int destroy_count; if (index_dir == NULL || stat(index_dir, &st) < 0) memset(&st, 0, sizeof(st)); /* compare index_dir inodes so we don't break even with symlinks. for in-memory indexes compare just mailbox paths */ destroy_count = 0; index = NULL; for (list = &indexes; *list != NULL;) { rec = *list; if (index_dir != NULL) { if (index == NULL && st.st_ino == rec->index_dir_ino && CMP_DEV_T(st.st_dev, rec->index_dir_dev)) { /* make sure the directory still exists. it might have been renamed and we're trying to access it via its new path now. */ if (stat(rec->index->dir, &st2) < 0 || st2.st_ino != st.st_ino || !CMP_DEV_T(st2.st_dev, st.st_dev)) rec->destroy_time = 0; else { rec->refcount++; index = rec->index; } } } else { if (index == NULL && st.st_ino == 0 && strcmp(mailbox_path, rec->mailbox_path) == 0) { rec->refcount++; index = rec->index; } } if (rec->refcount == 0) { if (rec->destroy_time <= ioloop_time || destroy_count >= INDEX_CACHE_MAX) { *list = rec->next; index_list_free(rec); continue; } else { destroy_count++; } } list = &(*list)->next; } if (index == NULL) { index = mail_index_alloc(index_dir, prefix); index_storage_add(index, mailbox_path, &st); } return index; } static void destroy_unrefed(bool all) { struct index_list **list, *rec; for (list = &indexes; *list != NULL;) { rec = *list; if (rec->refcount == 0 && (all || rec->destroy_time <= ioloop_time)) { *list = rec->next; index_list_free(rec); } else { list = &(*list)->next; } } if (indexes == NULL && to_index != NULL) timeout_remove(&to_index); } static void index_removal_timeout(void *context __attr_unused__) { destroy_unrefed(FALSE); } void index_storage_unref(struct mail_index *index) { struct index_list *list; for (list = indexes; list != NULL; list = list->next) { if (list->index == index) break; } i_assert(list != NULL); i_assert(list->refcount > 0); list->refcount--; list->destroy_time = ioloop_time + INDEX_CACHE_TIMEOUT; if (to_index == NULL) to_index = timeout_add(1000, index_removal_timeout, NULL); } void index_storage_destroy_unrefed(void) { destroy_unrefed(TRUE); } static void set_cache_decisions(const char *set, const char *fields, enum mail_cache_decision_type dec) { const char *const *arr; int i; if (fields == NULL || *fields == '\0') return; for (arr = t_strsplit_spaces(fields, " ,"); *arr != NULL; arr++) { for (i = 0; i < MAIL_CACHE_FIELD_COUNT; i++) { if (strcasecmp(global_cache_fields[i].name, *arr) == 0) { global_cache_fields[i].decision = dec; break; } } if (i == MAIL_CACHE_FIELD_COUNT) { i_error("%s: Invalid cache field name '%s', ignoring ", set, *arr); } } } static void index_cache_register_defaults(struct index_mailbox *ibox) { static bool initialized = FALSE; struct mail_cache *cache = ibox->cache; const char *cache_env, *never_env, *env; if (!initialized) { initialized = TRUE; cache_env = getenv("MAIL_CACHE_FIELDS"); if (cache_env == NULL) cache_env = DEFAULT_CACHE_FIELDS; never_env = getenv("MAIL_NEVER_CACHE_FIELDS"); if (never_env == NULL) never_env = DEFAULT_NEVER_CACHE_FIELDS; set_cache_decisions("mail_cache_fields", cache_env, MAIL_CACHE_DECISION_TEMP); set_cache_decisions("mail_never_cache_fields", never_env, MAIL_CACHE_DECISION_NO | MAIL_CACHE_DECISION_FORCED); env = getenv("MAIL_CACHE_MIN_MAIL_COUNT"); if (env != NULL) ibox->mail_cache_min_mail_count = atoi(env); } ibox->cache_fields = i_malloc(sizeof(global_cache_fields)); memcpy(ibox->cache_fields, global_cache_fields, sizeof(global_cache_fields)); mail_cache_register_fields(cache, ibox->cache_fields, MAIL_CACHE_FIELD_COUNT); } void index_storage_lock_notify(struct index_mailbox *ibox, enum mailbox_lock_notify_type notify_type, unsigned int secs_left) { struct index_storage *storage = ibox->storage; const char *str; time_t now; /* if notify type changes, print the message immediately */ now = time(NULL); if (ibox->last_notify_type == MAILBOX_LOCK_NOTIFY_NONE || ibox->last_notify_type == notify_type) { if (ibox->last_notify_type == MAILBOX_LOCK_NOTIFY_NONE && notify_type == MAILBOX_LOCK_NOTIFY_MAILBOX_OVERRIDE) { /* first override notification, show it */ } else { if (now < ibox->next_lock_notify || secs_left < 15) return; } } ibox->next_lock_notify = now + LOCK_NOTIFY_INTERVAL; ibox->last_notify_type = notify_type; switch (notify_type) { case MAILBOX_LOCK_NOTIFY_NONE: break; case MAILBOX_LOCK_NOTIFY_MAILBOX_ABORT: if (storage->callbacks->notify_no == NULL) break; str = t_strdup_printf("Mailbox is locked, will abort in " "%u seconds", secs_left); storage->callbacks->notify_no(&ibox->box, str, storage->callback_context); break; case MAILBOX_LOCK_NOTIFY_MAILBOX_OVERRIDE: if (storage->callbacks->notify_ok == NULL) break; str = t_strdup_printf("Stale mailbox lock file detected, " "will override in %u seconds", secs_left); storage->callbacks->notify_ok(&ibox->box, str, storage->callback_context); break; } } void index_storage_lock_notify_reset(struct index_mailbox *ibox) { ibox->next_lock_notify = time(NULL) + LOCK_NOTIFY_INTERVAL; ibox->last_notify_type = MAILBOX_LOCK_NOTIFY_NONE; } int index_storage_mailbox_init(struct index_mailbox *ibox, struct mail_index *index, const char *name, enum mailbox_open_flags flags, bool move_to_memory) { struct mail_storage *storage = &ibox->storage->storage; enum mail_index_open_flags index_flags; enum mail_index_lock_method lock_method = 0; int ret; i_assert(name != NULL); ibox->box.storage = storage; ibox->box.name = p_strdup(ibox->box.pool, name); array_create(&ibox->box.module_contexts, ibox->box.pool, sizeof(void *), 5); index_flags = move_to_memory ? 0 : MAIL_INDEX_OPEN_FLAG_CREATE; if ((flags & MAILBOX_OPEN_FAST) != 0) index_flags |= MAIL_INDEX_OPEN_FLAG_FAST; if ((storage->flags & MAIL_STORAGE_FLAG_MMAP_DISABLE) != 0) index_flags |= MAIL_INDEX_OPEN_FLAG_MMAP_DISABLE; #ifndef MMAP_CONFLICTS_WRITE if ((storage->flags & MAIL_STORAGE_FLAG_MMAP_NO_WRITE) != 0) #endif index_flags |= MAIL_INDEX_OPEN_FLAG_MMAP_NO_WRITE; switch (storage->lock_method) { case MAIL_STORAGE_LOCK_FCNTL: lock_method = MAIL_INDEX_LOCK_FCNTL; break; case MAIL_STORAGE_LOCK_FLOCK: lock_method = MAIL_INDEX_LOCK_FLOCK; break; case MAIL_STORAGE_LOCK_DOTLOCK: lock_method = MAIL_INDEX_LOCK_DOTLOCK; break; } ibox->readonly = (flags & MAILBOX_OPEN_READONLY) != 0; ibox->keep_recent = (flags & MAILBOX_OPEN_KEEP_RECENT) != 0; ibox->index = index; ibox->next_lock_notify = time(NULL) + LOCK_NOTIFY_INTERVAL; ibox->commit_log_file_seq = 0; ibox->mail_read_mmaped = (storage->flags & MAIL_STORAGE_FLAG_MMAP_MAILS) != 0; ret = mail_index_open(index, index_flags, lock_method); if (ret <= 0 || move_to_memory) { if (mail_index_move_to_memory(index) < 0) { /* try opening once more. it should be created directly into memory now. */ ret = mail_index_open(index, index_flags, lock_method); if (ret <= 0) { mail_storage_set_index_error(ibox); index_storage_mailbox_free(&ibox->box); return -1; } } } ibox->md5hdr_ext_idx = mail_index_ext_register(index, "header-md5", 0, 16, 1); ibox->cache = mail_index_get_cache(index); index_cache_register_defaults(ibox); ibox->view = mail_index_view_open(index); ibox->keyword_names = mail_index_get_keywords(index); return 0; } void index_storage_mailbox_free(struct mailbox *box) { struct index_mailbox *ibox = (struct index_mailbox *) box; if (ibox->view != NULL) mail_index_view_close(&ibox->view); index_mailbox_check_remove_all(ibox); if (ibox->index != NULL) index_storage_unref(ibox->index); i_free(ibox->cache_fields); pool_unref(box->pool); } bool index_storage_is_readonly(struct mailbox *box) { struct index_mailbox *ibox = (struct index_mailbox *) box; return ibox->readonly; } bool index_storage_allow_new_keywords(struct mailbox *box) { struct index_mailbox *ibox = (struct index_mailbox *) box; /* FIXME: return FALSE if we're full */ return !ibox->readonly; } bool index_storage_is_inconsistent(struct mailbox *box) { struct index_mailbox *ibox = (struct index_mailbox *) box; return mail_index_view_is_inconsistent(ibox->view); } void index_storage_set_callbacks(struct mail_storage *_storage, struct mail_storage_callbacks *callbacks, void *context) { struct index_storage *storage = (struct index_storage *) _storage; *storage->callbacks = *callbacks; storage->callback_context = context; } const char *index_storage_get_last_error(struct mail_storage *storage, bool *syntax_error_r, bool *temporary_error_r) { *syntax_error_r = storage->syntax_error; *temporary_error_r = storage->temporary_error; return storage->error; } void mail_storage_set_index_error(struct index_mailbox *ibox) { switch (mail_index_get_last_error(ibox->index)) { case MAIL_INDEX_ERROR_NONE: case MAIL_INDEX_ERROR_INTERNAL: mail_storage_set_internal_error(ibox->box.storage); break; case MAIL_INDEX_ERROR_DISKSPACE: mail_storage_set_error(ibox->box.storage, "Out of disk space"); break; } if (ibox->view != NULL) mail_index_view_unlock(ibox->view); mail_index_reset_error(ibox->index); } struct mail_keywords * index_keywords_create(struct mailbox_transaction_context *_t, const char *const keywords[]) { struct index_transaction_context *t = (struct index_transaction_context *)_t; return mail_index_keywords_create(t->trans, keywords); } void index_keywords_free(struct mailbox_transaction_context *t __attr_unused__, struct mail_keywords *keywords) { mail_index_keywords_free(&keywords); }