src/lib-index/mail-index.c

	mail-index.c revision 1dd875d96ab5640f78250079961c10e99ed4aa79
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger/* Copyright (c) 2003-2009 Dovecot authors, see the included COPYING file */
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "lib.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "ioloop.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "array.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "buffer.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "eacces-error.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "hash.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "str-sanitize.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "mmap-util.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "nfs-workarounds.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "read-full.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "write-full.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "mail-index-private.h"
f5a01e37663bdf559d6e251191b5097dd6f28ea5Julian Kornberger#include "mail-index-view-private.h"
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger#include "mail-index-sync-private.h"
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger#include "mail-index-modseq.h"
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger#include "mail-transaction-log.h"
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger#include "mail-cache.h"
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger#include <stdio.h>
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger#include <stddef.h>
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger#include <time.h>
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger#include <sys/stat.h>
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornbergerstruct mail_index_module_register mail_index_module_register = { 0 };
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornbergerstruct mail_index *mail_index_alloc(const char *dir, const char *prefix)
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger{
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger    struct mail_index *index;
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger    index = i_new(struct mail_index, 1);
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger    index->dir = i_strdup(dir);
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger    index->prefix = i_strdup(prefix);
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger    index->fd = -1;
f788f380e8ad6e3923210eaacfc832b2bd015428Julian Kornberger
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger    index->extension_pool =
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger        pool_alloconly_create(MEMPOOL_GROWING"index extension", 1024);
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger    p_array_init(&index->extensions, index->extension_pool, 5);
f5a01e37663bdf559d6e251191b5097dd6f28ea5Julian Kornberger    i_array_init(&index->sync_lost_handlers, 4);
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger    i_array_init(&index->module_contexts,
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger             I_MIN(5, mail_index_module_register.id));
0c480325395e8989d1abc5ba6d71a8bdd524bc4eIngo Becker
f5a01e37663bdf559d6e251191b5097dd6f28ea5Julian Kornberger    index->mode = 0600;
0c480325395e8989d1abc5ba6d71a8bdd524bc4eIngo Becker    index->gid = (gid_t)-1;
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger    index->keywords_ext_id =
5cad3e82e8c017bc189c4cecc00541ec19a2a6e2Julian Kornberger        mail_index_ext_register(index, MAIL_INDEX_EXT_KEYWORDS,
                    128, 2, 1);
    index->keywords_pool = pool_alloconly_create("keywords", 512);
    i_array_init(&index->keywords, 16);
    index->keywords_hash =
        hash_table_create(default_pool, index->keywords_pool, 0,
                  strcase_hash, (hash_cmp_callback_t *)strcasecmp);
    index->log = mail_transaction_log_alloc(index);
    mail_index_modseq_init(index);
    return index;
}

void mail_index_free(struct mail_index **_index)
{
    struct mail_index *index = *_index;

    *_index = NULL;
    mail_index_close(index);

    mail_transaction_log_free(&index->log);
    hash_table_destroy(&index->keywords_hash);
    pool_unref(&index->extension_pool);
    pool_unref(&index->keywords_pool);

    array_free(&index->sync_lost_handlers);
    array_free(&index->keywords);
    array_free(&index->module_contexts);

    i_free(index->error);
    i_free(index->dir);
    i_free(index->prefix);
    i_free(index);
}

void mail_index_set_fsync_types(struct mail_index *index,
                enum mail_index_sync_type fsync_mask)
{
    index->fsync_mask = fsync_mask;
}

void mail_index_set_permissions(struct mail_index *index,
                mode_t mode, gid_t gid)
{
    index->mode = mode & 0666;
    index->gid = gid;
}

uint32_t mail_index_ext_register(struct mail_index *index, const char *name,
                 uint32_t default_hdr_size,
                 uint16_t default_record_size,
                 uint16_t default_record_align)
{
    struct mail_index_registered_ext rext;
    uint32_t ext_id;

    if (*name == '\0' || strcmp(name, str_sanitize(name, -1)) != 0)
        i_panic("mail_index_ext_register(%s): Invalid name", name);

    if (default_record_size != 0 && default_record_align == 0) {
        i_panic("mail_index_ext_register(%s): "
            "Invalid record alignment", name);
    }

    if (mail_index_ext_lookup(index, name, &ext_id))
        return ext_id;

    memset(&rext, 0, sizeof(rext));
    rext.name = p_strdup(index->extension_pool, name);
    rext.index_idx = array_count(&index->extensions);
    rext.hdr_size = default_hdr_size;
    rext.record_size = default_record_size;
    rext.record_align = default_record_align;

    array_append(&index->extensions, &rext, 1);
    return rext.index_idx;
}

bool mail_index_ext_lookup(struct mail_index *index, const char *name,
               uint32_t *ext_id_r)
{
        const struct mail_index_registered_ext *extensions;
    unsigned int i, count;

    extensions = array_get(&index->extensions, &count);
    for (i = 0; i < count; i++) {
        if (strcmp(extensions[i].name, name) == 0) {
            *ext_id_r = i;
            return TRUE;
        }
    }

    *ext_id_r = (uint32_t)-1;
    return FALSE;
}

void mail_index_register_expunge_handler(struct mail_index *index,
                     uint32_t ext_id, bool call_always,
                     mail_index_expunge_handler_t *cb,
                     void *context)
{
    struct mail_index_registered_ext *rext;

    rext = array_idx_modifiable(&index->extensions, ext_id);
    i_assert(rext->expunge_handler == NULL || rext->expunge_handler == cb);

    rext->expunge_handler = cb;
    rext->expunge_context = context;
    rext->expunge_handler_call_always = call_always;
}

void mail_index_unregister_expunge_handler(struct mail_index *index,
                       uint32_t ext_id)
{
    struct mail_index_registered_ext *rext;

    rext = array_idx_modifiable(&index->extensions, ext_id);
    i_assert(rext->expunge_handler != NULL);

    rext->expunge_handler = NULL;
}

void mail_index_register_sync_handler(struct mail_index *index, uint32_t ext_id,
                      mail_index_sync_handler_t *cb,
                      enum mail_index_sync_handler_type type)
{
    struct mail_index_registered_ext *rext;

    rext = array_idx_modifiable(&index->extensions, ext_id);
    i_assert(rext->sync_handler.callback == NULL);

    rext->sync_handler.callback = cb;
    rext->sync_handler.type = type;
}

void mail_index_unregister_sync_handler(struct mail_index *index,
                    uint32_t ext_id)
{
    struct mail_index_registered_ext *rext;

    rext = array_idx_modifiable(&index->extensions, ext_id);
    i_assert(rext->sync_handler.callback != NULL);

    rext->sync_handler.callback = NULL;
    rext->sync_handler.type = 0;
}

void mail_index_register_sync_lost_handler(struct mail_index *index,
                       mail_index_sync_lost_handler_t *cb)
{
    array_append(&index->sync_lost_handlers, &cb, 1);
}

void mail_index_unregister_sync_lost_handler(struct mail_index *index,
                         mail_index_sync_lost_handler_t *cb)
{
    mail_index_sync_lost_handler_t *const *handlers;
    unsigned int i, count;

    handlers = array_get(&index->sync_lost_handlers, &count);
    for (i = 0; i < count; i++) {
        if (handlers[i] == cb) {
            array_delete(&index->sync_lost_handlers, i, 1);
            break;
        }
    }
}

bool mail_index_keyword_lookup(struct mail_index *index,
                   const char *keyword, unsigned int *idx_r)
{
    void *value;

    /* keywords_hash keeps a name => index mapping of keywords.
       Keywords are never removed from it, so the index values are valid
       for the lifetime of the mail_index. */
    if (hash_table_lookup_full(index->keywords_hash, keyword,
                   NULL, &value)) {
        *idx_r = POINTER_CAST_TO(value, unsigned int);
        return TRUE;
    }

    *idx_r = (unsigned int)-1;
    return FALSE;
}

void mail_index_keyword_lookup_or_create(struct mail_index *index,
                     const char *keyword,
                     unsigned int *idx_r)
{
    char *keyword_dup;

    i_assert(*keyword != '\0');

    if (mail_index_keyword_lookup(index, keyword, idx_r))
        return;

    keyword = keyword_dup = p_strdup(index->keywords_pool, keyword);
    *idx_r = array_count(&index->keywords);

    hash_table_insert(index->keywords_hash,
              keyword_dup, POINTER_CAST(*idx_r));
    array_append(&index->keywords, &keyword, 1);
}

const ARRAY_TYPE(keywords) *mail_index_get_keywords(struct mail_index *index)
{
    return &index->keywords;
}

int mail_index_try_open_only(struct mail_index *index)
{
    i_assert(index->fd == -1);
    i_assert(!MAIL_INDEX_IS_IN_MEMORY(index));

        /* Note that our caller must close index->fd by itself. */
    if (index->readonly)
        errno = EACCES;
    else {
        index->fd = nfs_safe_open(index->filepath, O_RDWR);
        index->readonly = FALSE;
    }

    if (index->fd == -1 && errno == EACCES) {
        index->fd = open(index->filepath, O_RDONLY);
        index->readonly = TRUE;
    }

    if (index->fd == -1) {
        if (errno != ENOENT)
            return mail_index_set_syscall_error(index, "open()");

        /* have to create it */
        return 0;
    }
    return 1;
}

static int
mail_index_try_open(struct mail_index *index)
{
    int ret;

        i_assert(index->fd == -1);

    if (MAIL_INDEX_IS_IN_MEMORY(index))
        return 0;

    i_assert(index->map == NULL || index->map->rec_map->lock_id == 0);
    ret = mail_index_map(index, MAIL_INDEX_SYNC_HANDLER_HEAD);
    if (ret == 0) {
        /* it's corrupted - recreate it */
        if (index->fd != -1) {
            if (close(index->fd) < 0)
                mail_index_set_syscall_error(index, "close()");
            index->fd = -1;
        }
    }
    return ret;
}

int mail_index_create_tmp_file(struct mail_index *index, const char **path_r)
{
        mode_t old_mask;
    const char *path;
    int fd;

    i_assert(!MAIL_INDEX_IS_IN_MEMORY(index));

    path = *path_r = t_strconcat(index->filepath, ".tmp", NULL);
    old_mask = umask(0);
    fd = open(path, O_RDWR|O_CREAT|O_TRUNC, index->mode);
    umask(old_mask);
    if (fd == -1)
        return mail_index_file_set_syscall_error(index, path, "open()");

    mail_index_fchown(index, fd, path);
    return fd;
}

static int mail_index_open_files(struct mail_index *index,
                 enum mail_index_open_flags flags)
{
    int ret;
    bool created = FALSE;

    ret = mail_transaction_log_open(index->log);
    if (ret == 0) {
        if ((flags & MAIL_INDEX_OPEN_FLAG_CREATE) == 0)
            return 0;

        /* if dovecot.index exists, read it first so that we can get
           the correct indexid and log sequence */
        (void)mail_index_try_open(index);

        if (index->indexid == 0) {
            /* Create a new indexid for us. If we're opening index
               into memory, index->map doesn't exist yet. */
            index->indexid = ioloop_time;
            index->initial_create = TRUE;
            if (index->map != NULL)
                index->map->hdr.indexid = index->indexid;
        }

        ret = mail_transaction_log_create(index->log, FALSE);
        index->initial_create = FALSE;
        created = TRUE;
    }
    if (ret >= 0) {
        ret = index->map != NULL ? 1 : mail_index_try_open(index);
        if (ret == 0) {
            /* corrupted */
            mail_transaction_log_close(index->log);
            ret = mail_transaction_log_create(index->log, TRUE);
            if (ret == 0) {
                if (index->map != NULL)
                    mail_index_unmap(&index->map);
                index->map = mail_index_map_alloc(index);
            }
        }
    }
    if (ret < 0) {
        /* open/create failed, fallback to in-memory indexes */
        if ((flags & MAIL_INDEX_OPEN_FLAG_CREATE) == 0)
            return -1;

        if (mail_index_move_to_memory(index) < 0)
            return -1;
    }

    index->cache = created ? mail_cache_create(index) :
        mail_cache_open_or_create(index);
    return 1;
}

int mail_index_open(struct mail_index *index, enum mail_index_open_flags flags,
            enum file_lock_method lock_method)
{
    int ret;

    if (index->opened) {
        if (index->map != NULL &&
            (index->map->hdr.flags &
             MAIL_INDEX_HDR_FLAG_CORRUPTED) != 0) {
            /* corrupted, reopen files */
                        mail_index_close(index);
        } else {
            i_assert(index->map != NULL);
            return 1;
        }
    }

    index->filepath = MAIL_INDEX_IS_IN_MEMORY(index) ?
        i_strdup("(in-memory index)") :
        i_strconcat(index->dir, "/", index->prefix, NULL);

    index->shared_lock_count = 0;
    index->excl_lock_count = 0;
    index->lock_type = F_UNLCK;
    index->lock_id_counter = 2;

    index->readonly = FALSE;
    index->nodiskspace = FALSE;
    index->index_lock_timeout = FALSE;
    index->log_locked = FALSE;
    index->mmap_disable = (flags & MAIL_INDEX_OPEN_FLAG_MMAP_DISABLE) != 0;
    index->use_excl_dotlocks =
        (flags & MAIL_INDEX_OPEN_FLAG_DOTLOCK_USE_EXCL) != 0;
    index->fsync_disable =
        (flags & MAIL_INDEX_OPEN_FLAG_FSYNC_DISABLE) != 0;
    index->nfs_flush = (flags & MAIL_INDEX_OPEN_FLAG_NFS_FLUSH) != 0;
    index->readonly = (flags & MAIL_INDEX_OPEN_FLAG_READONLY) != 0;
    index->keep_backups = (flags & MAIL_INDEX_OPEN_FLAG_KEEP_BACKUPS) != 0;
    index->never_in_memory =
        (flags & MAIL_INDEX_OPEN_FLAG_NEVER_IN_MEMORY) != 0;
    index->lock_method = lock_method;

    if (index->nfs_flush && index->fsync_disable)
        i_fatal("nfs flush requires fsync_disable=no");
    if (index->nfs_flush && !index->mmap_disable)
        i_fatal("nfs flush requires mmap_disable=yes");

    if ((ret = mail_index_open_files(index, flags)) <= 0) {
        /* doesn't exist and create flag not used */
        mail_index_close(index);
        return ret;
    }

    i_assert(index->map != NULL);
    index->opened = TRUE;
    return 1;
}

int mail_index_open_or_create(struct mail_index *index,
                  enum mail_index_open_flags flags,
                  enum file_lock_method lock_method)
{
    int ret;

    flags |= MAIL_INDEX_OPEN_FLAG_CREATE;
    ret = mail_index_open(index, flags, lock_method);
    i_assert(ret != 0);
    return ret < 0 ? -1 : 0;
}

void mail_index_close_file(struct mail_index *index)
{
    if (index->file_lock != NULL)
        file_lock_free(&index->file_lock);

    if (index->fd != -1) {
        if (close(index->fd) < 0)
            mail_index_set_syscall_error(index, "close()");
        index->fd = -1;
    }

    index->lock_id_counter += 2;
    index->lock_type = F_UNLCK;
    index->shared_lock_count = 0;
    index->excl_lock_count = 0;
}

void mail_index_close(struct mail_index *index)
{
    if (index->map != NULL)
        mail_index_unmap(&index->map);

    mail_index_close_file(index);
    mail_transaction_log_close(index->log);
    if (index->cache != NULL)
        mail_cache_free(&index->cache);

    i_free_and_null(index->filepath);

    index->indexid = 0;
    index->opened = FALSE;
}

int mail_index_unlink(struct mail_index *index)
{
    const char *path;
    int last_errno = 0;

    if (MAIL_INDEX_IS_IN_MEMORY(index))
        return 0;

    /* main index */
    if (unlink(index->filepath) < 0 && errno != ENOENT)
        last_errno = errno;

    /* logs */
    path = t_strconcat(index->filepath, MAIL_TRANSACTION_LOG_SUFFIX, NULL);
    if (unlink(path) < 0 && errno != ENOENT)
        last_errno = errno;

    path = t_strconcat(index->filepath,
               MAIL_TRANSACTION_LOG_SUFFIX".2", NULL);
    if (unlink(path) < 0 && errno != ENOENT)
        last_errno = errno;

    /* cache */
    path = t_strconcat(index->filepath, MAIL_CACHE_FILE_SUFFIX, NULL);
    if (unlink(path) < 0 && errno != ENOENT)
        last_errno = errno;

    if (last_errno == 0)
        return 0;
    else {
        errno = last_errno;
        return -1;
    }
}

int mail_index_reopen_if_changed(struct mail_index *index)
{
    struct stat st1, st2;

    i_assert(index->shared_lock_count == 0 || !index->nfs_flush);
    i_assert(index->excl_lock_count == 0);

    if (MAIL_INDEX_IS_IN_MEMORY(index))
        return 0;

    if (index->fd == -1)
        return mail_index_try_open_only(index);

    if (index->nfs_flush)
        nfs_flush_file_handle_cache(index->filepath);
    if (nfs_safe_stat(index->filepath, &st2) < 0) {
        if (errno == ENOENT)
            return 0;
        return mail_index_set_syscall_error(index, "stat()");
    }

    if (fstat(index->fd, &st1) < 0) {
        if (errno != ESTALE)
            return mail_index_set_syscall_error(index, "fstat()");
        /* deleted/recreated, reopen */
    } else if (st1.st_ino == st2.st_ino &&
           CMP_DEV_T(st1.st_dev, st2.st_dev)) {
        /* the same file */
        return 1;
    }

    /* new file, new locks. the old fd can keep its locks, they don't
       matter anymore as no-one's going to modify the file. */
    mail_index_close_file(index);

    return mail_index_try_open_only(index);
}

int mail_index_refresh(struct mail_index *index)
{
    int ret;

    ret = mail_index_map(index, MAIL_INDEX_SYNC_HANDLER_HEAD);
    return ret <= 0 ? -1 : 0;
}

struct mail_cache *mail_index_get_cache(struct mail_index *index)
{
    return index->cache;
}

int mail_index_set_error(struct mail_index *index, const char *fmt, ...)
{
    va_list va;

    i_free(index->error);

    if (fmt == NULL)
        index->error = NULL;
    else {
        va_start(va, fmt);
        index->error = i_strdup_vprintf(fmt, va);
        va_end(va);

        i_error("%s", index->error);
    }

    return -1;
}

bool mail_index_is_in_memory(struct mail_index *index)
{
    return MAIL_INDEX_IS_IN_MEMORY(index);
}

int mail_index_move_to_memory(struct mail_index *index)
{
    struct mail_index_map *map;

    if (MAIL_INDEX_IS_IN_MEMORY(index))
        return index->map == NULL ? -1 : 0;

    if (index->never_in_memory)
        return -1;

    /* set the index as being into memory */
    i_free_and_null(index->dir);

    i_free(index->filepath);
    index->filepath = i_strdup("(in-memory index)");

    if (index->map == NULL) {
        /* index was never even opened. just mark it as being in
           memory and let the caller re-open the index. */
        i_assert(index->fd == -1);
        return -1;
    }

    /* move index map to memory */
    if (!MAIL_INDEX_MAP_IS_IN_MEMORY(index->map)) {
        map = mail_index_map_clone(index->map);
        mail_index_unmap(&index->map);
        index->map = map;
    }

    if (index->log != NULL) {
        /* move transaction log to memory */
        mail_transaction_log_move_to_memory(index->log);
    }

    if (index->file_lock != NULL)
        file_lock_free(&index->file_lock);

    if (index->fd != -1) {
        if (close(index->fd) < 0)
            mail_index_set_syscall_error(index, "close()");
        index->fd = -1;
    }
    return 0;
}

void mail_index_mark_corrupted(struct mail_index *index)
{
    index->indexid = 0;

    index->map->hdr.flags |= MAIL_INDEX_HDR_FLAG_CORRUPTED;
    if (unlink(index->filepath) < 0 && errno != ENOENT && errno != ESTALE)
        mail_index_set_syscall_error(index, "unlink()");
}

void mail_index_fchown(struct mail_index *index, int fd, const char *path)
{
    mode_t mode;

    if (index->gid == (gid_t)-1) {
        /* no gid changing */
        return;
    } else if (fchown(fd, (uid_t)-1, index->gid) == 0) {
        /* success */
        return;
    } if ((index->mode & 0060) >> 3 == (index->mode & 0006)) {
        /* group and world permissions are the same, so group doesn't
           really matter. ignore silently. */
        return;
    }
    mail_index_file_set_syscall_error(index, path, "fchown()");

    /* continue, but change permissions so that only the common
       subset of group and world is used. this makes sure no one
       gets any extra permissions. */
    mode = ((index->mode & 0060) >> 3) & (index->mode & 0006);
    mode |= (mode << 3) | (index->mode & 0600);
    if (fchmod(fd, mode) < 0)
        mail_index_file_set_syscall_error(index, path, "fchmod()");
}

int mail_index_set_syscall_error(struct mail_index *index,
                 const char *function)
{
    i_assert(function != NULL);

    if (ENOSPACE(errno)) {
        index->nodiskspace = TRUE;
        if (!index->never_in_memory)
            return -1;
    }

    return mail_index_set_error(index, "%s failed with index file %s: %m",
                    function, index->filepath);
}

int mail_index_file_set_syscall_error(struct mail_index *index,
                      const char *filepath,
                      const char *function)
{
    i_assert(filepath != NULL);
    i_assert(function != NULL);

    if (ENOSPACE(errno)) {
        index->nodiskspace = TRUE;
        if (!index->never_in_memory)
            return -1;
    }

    if (errno == EACCES) {
        return mail_index_set_error(index, "%s",
            eacces_error_get(t_strcut(function, '('), filepath));
    } else {
        return mail_index_set_error(index, "%s failed with file %s: %m",
                        function, filepath);
    }
}

const char *mail_index_get_error_message(struct mail_index *index)
{
    return index->error;
}

void mail_index_reset_error(struct mail_index *index)
{
    if (index->error != NULL) {
        i_free(index->error);
        index->error = NULL;
    }

    index->nodiskspace = FALSE;
        index->index_lock_timeout = FALSE;
}