maildir-uidlist.c revision e7912167935f67b3dc68c80bf80d719bb1cdc533
1273N/A/* Copyright (c) 2003-2010 Dovecot authors, see the included COPYING file */
1273N/A
1273N/A/*
1273N/A Version 1 format has been used for most versions of Dovecot up to v1.0.x.
1273N/A It's also compatible with Courier IMAP's courierimapuiddb file.
1273N/A The format is:
1273N/A
1273N/A header: 1 <uid validity> <next uid>
1273N/A entry: <uid> <filename>
1273N/A
1273N/A --
1273N/A
1273N/A Version 2 format was written by a few development Dovecot versions, but
1273N/A v1.0.x still parses the format. The format has <flags> field after <uid>.
1273N/A
1273N/A --
1273N/A
1273N/A Version 3 format is an extensible format used by Dovecot v1.1 and later.
1273N/A It's also parsed by v1.0.2 (and later). The format is:
1273N/A
1273N/A header: 3 [<key><value> ...]
1273N/A entry: <uid> [<key><value> ...] :<filename>
1273N/A
1273N/A See enum maildir_uidlist_*_ext_key for used keys.
1273N/A*/
1273N/A
1273N/A#include "lib.h"
1273N/A#include "array.h"
1273N/A#include "hash.h"
1273N/A#include "istream.h"
1273N/A#include "ostream.h"
1273N/A#include "str.h"
1273N/A#include "hex-binary.h"
1273N/A#include "file-dotlock.h"
1273N/A#include "close-keep-errno.h"
1273N/A#include "nfs-workarounds.h"
1273N/A#include "eacces-error.h"
1273N/A#include "maildir-storage.h"
1273N/A#include "maildir-sync.h"
1273N/A#include "maildir-filename.h"
1273N/A#include "maildir-uidlist.h"
1273N/A
1273N/A#include <stdio.h>
1273N/A#include <stdlib.h>
1273N/A#include <sys/stat.h>
1273N/A
1273N/A/* NFS: How many times to retry reading dovecot-uidlist file if ESTALE
1273N/A error occurs in the middle of reading it */
1273N/A#define UIDLIST_ESTALE_RETRY_COUNT NFS_ESTALE_RETRY_COUNT
1273N/A
1273N/A#define UIDLIST_VERSION 3
1273N/A#define UIDLIST_COMPRESS_PERCENTAGE 75
1273N/A
1273N/A#define UIDLIST_IS_LOCKED(uidlist) \
1273N/A ((uidlist)->lock_count > 0)
1273N/A#define UIDLIST_ALLOW_WRITING(uidlist) \
1273N/A (UIDLIST_IS_LOCKED(uidlist) || (uidlist)->mbox == NULL)
1273N/A
1273N/Astruct maildir_uidlist_rec {
1273N/A uint32_t uid;
1273N/A uint32_t flags;
1273N/A char *filename;
1273N/A unsigned char *extensions; /* <data>\0[<data>\0 ...]\0 */
1273N/A};
1273N/AARRAY_DEFINE_TYPE(maildir_uidlist_rec_p, struct maildir_uidlist_rec *);
1273N/A
1273N/Astruct maildir_uidlist {
1273N/A struct maildir_mailbox *mbox;
1273N/A char *path;
1273N/A
1273N/A int fd;
1273N/A dev_t fd_dev;
1273N/A ino_t fd_ino;
1273N/A off_t fd_size;
1273N/A
1273N/A unsigned int lock_count;
1273N/A
1273N/A struct dotlock_settings dotlock_settings;
1273N/A struct dotlock *dotlock;
1273N/A
1273N/A pool_t record_pool;
1273N/A ARRAY_TYPE(maildir_uidlist_rec_p) records;
1273N/A struct hash_table *files;
1273N/A unsigned int change_counter;
1273N/A
1273N/A unsigned int version;
1273N/A unsigned int uid_validity, next_uid, prev_read_uid, last_seen_uid;
1273N/A unsigned int hdr_next_uid;
1273N/A unsigned int read_records_count, read_line_count;
1273N/A uoff_t last_read_offset;
1273N/A string_t *hdr_extensions;
1273N/A
1273N/A uint8_t mailbox_guid[MAIL_GUID_128_SIZE];
1273N/A
1273N/A unsigned int recreate:1;
1273N/A unsigned int recreate_on_change:1;
1273N/A unsigned int initial_read:1;
1273N/A unsigned int initial_hdr_read:1;
1273N/A unsigned int retry_rewind:1;
1273N/A unsigned int locked_refresh:1;
1273N/A unsigned int unsorted:1;
1273N/A unsigned int have_mailbox_guid:1;
1273N/A};
1273N/A
1273N/Astruct maildir_uidlist_sync_ctx {
1273N/A struct maildir_uidlist *uidlist;
1273N/A enum maildir_uidlist_sync_flags sync_flags;
1273N/A
1273N/A pool_t record_pool;
1273N/A ARRAY_TYPE(maildir_uidlist_rec_p) records;
1273N/A struct hash_table *files;
1273N/A
1273N/A unsigned int first_unwritten_pos, first_new_pos;
1273N/A unsigned int new_files_count;
1273N/A unsigned int finish_change_counter;
1273N/A
1273N/A unsigned int partial:1;
1273N/A unsigned int finished:1;
1273N/A unsigned int changed:1;
1273N/A unsigned int failed:1;
1273N/A unsigned int locked:1;
1273N/A};
1273N/A
1273N/Astruct maildir_uidlist_iter_ctx {
1273N/A struct maildir_uidlist *uidlist;
1273N/A struct maildir_uidlist_rec *const *next, *const *end;
1273N/A
1273N/A unsigned int change_counter;
1273N/A uint32_t prev_uid;
1273N/A};
1273N/A
1273N/Astatic int maildir_uidlist_open_latest(struct maildir_uidlist *uidlist);
1273N/Astatic bool maildir_uidlist_iter_next_rec(struct maildir_uidlist_iter_ctx *ctx,
1273N/A struct maildir_uidlist_rec **rec_r);
1273N/A
1273N/Astatic int maildir_uidlist_lock_timeout(struct maildir_uidlist *uidlist,
1273N/A bool nonblock, bool refresh,
1273N/A bool refresh_when_locked)
1273N/A{
1273N/A struct mailbox *box = &uidlist->mbox->box;
1273N/A const char *control_dir, *path;
1273N/A mode_t old_mask;
1273N/A const enum dotlock_create_flags dotlock_flags =
1273N/A nonblock ? DOTLOCK_CREATE_FLAG_NONBLOCK : 0;
1273N/A int i, ret;
1273N/A
1273N/A if (uidlist->lock_count > 0) {
1273N/A if (!uidlist->locked_refresh && refresh_when_locked) {
1273N/A if (maildir_uidlist_refresh(uidlist) < 0)
1273N/A return -1;
1273N/A }
1273N/A uidlist->lock_count++;
1273N/A return 1;
1273N/A }
1273N/A
1273N/A index_storage_lock_notify_reset(&uidlist->mbox->box);
1273N/A
1273N/A control_dir = mailbox_list_get_path(box->list, box->name,
1273N/A MAILBOX_LIST_PATH_TYPE_CONTROL);
1273N/A path = t_strconcat(control_dir, "/" MAILDIR_UIDLIST_NAME, NULL);
1273N/A
1273N/A for (i = 0;; i++) {
1273N/A old_mask = umask(0777 & ~box->file_create_mode);
1273N/A ret = file_dotlock_create(&uidlist->dotlock_settings, path,
1273N/A dotlock_flags, &uidlist->dotlock);
1273N/A umask(old_mask);
1273N/A if (ret > 0)
1273N/A break;
1273N/A
1273N/A /* failure */
1273N/A if (ret == 0) {
1273N/A mail_storage_set_error(box->storage,
1273N/A MAIL_ERROR_TEMP, MAIL_ERRSTR_LOCK_TIMEOUT);
1273N/A return 0;
1273N/A }
1273N/A if (errno != ENOENT || i == MAILDIR_DELETE_RETRY_COUNT ||
1273N/A uidlist->mbox == NULL) {
1273N/A if (errno == EACCES) {
1273N/A mail_storage_set_critical(box->storage, "%s",
1273N/A eacces_error_get_creating("file_dotlock_create", path));
1273N/A } else {
1273N/A mail_storage_set_critical(box->storage,
1273N/A "file_dotlock_create(%s) failed: %m",
1273N/A path);
1273N/A }
1273N/A return -1;
1273N/A }
1273N/A /* the control dir doesn't exist. create it unless the whole
1273N/A mailbox was just deleted. */
1273N/A if (!maildir_set_deleted(&uidlist->mbox->box))
1273N/A return -1;
1273N/A }
1273N/A
1273N/A uidlist->lock_count++;
1273N/A uidlist->locked_refresh = FALSE;
1273N/A
1273N/A if (refresh) {
1273N/A /* make sure we have the latest changes before
1273N/A changing anything */
1273N/A if (maildir_uidlist_refresh(uidlist) < 0) {
1273N/A maildir_uidlist_unlock(uidlist);
1273N/A return -1;
1273N/A }
1273N/A }
1273N/A return 1;
1273N/A}
1273N/A
1273N/Aint maildir_uidlist_lock(struct maildir_uidlist *uidlist)
1273N/A{
1273N/A return maildir_uidlist_lock_timeout(uidlist, FALSE, TRUE, FALSE);
1273N/A}
1273N/A
1273N/Aint maildir_uidlist_try_lock(struct maildir_uidlist *uidlist)
1273N/A{
1273N/A return maildir_uidlist_lock_timeout(uidlist, TRUE, TRUE, FALSE);
1273N/A}
1273N/A
1273N/Aint maildir_uidlist_lock_touch(struct maildir_uidlist *uidlist)
1273N/A{
1273N/A i_assert(UIDLIST_IS_LOCKED(uidlist));
1273N/A
1273N/A return file_dotlock_touch(uidlist->dotlock);
1273N/A}
1273N/A
1273N/Abool maildir_uidlist_is_locked(struct maildir_uidlist *uidlist)
1273N/A{
1273N/A return UIDLIST_IS_LOCKED(uidlist);
1273N/A}
1273N/A
1273N/Avoid maildir_uidlist_unlock(struct maildir_uidlist *uidlist)
1273N/A{
1273N/A i_assert(uidlist->lock_count > 0);
1273N/A
1273N/A if (--uidlist->lock_count > 0)
1273N/A return;
1273N/A
1273N/A uidlist->locked_refresh = FALSE;
1273N/A (void)file_dotlock_delete(&uidlist->dotlock);
1273N/A}
1273N/A
1273N/Astatic bool dotlock_callback(unsigned int secs_left, bool stale, void *context)
1273N/A{
1273N/A struct mailbox *box = context;
1273N/A
1273N/A index_storage_lock_notify(box, stale ?
1273N/A MAILBOX_LOCK_NOTIFY_MAILBOX_OVERRIDE :
1273N/A MAILBOX_LOCK_NOTIFY_MAILBOX_ABORT,
1273N/A secs_left);
1273N/A return TRUE;
1273N/A}
1273N/A
1273N/Astruct maildir_uidlist *maildir_uidlist_init(struct maildir_mailbox *mbox)
1273N/A{
1273N/A struct maildir_uidlist *uidlist;
1273N/A const char *control_dir;
1273N/A
1273N/A control_dir = mailbox_list_get_path(mbox->box.list, mbox->box.name,
1273N/A MAILBOX_LIST_PATH_TYPE_CONTROL);
1273N/A
1273N/A uidlist = i_new(struct maildir_uidlist, 1);
1273N/A uidlist->mbox = mbox;
1273N/A uidlist->fd = -1;
1273N/A uidlist->path = i_strconcat(control_dir, "/"MAILDIR_UIDLIST_NAME, NULL);
1273N/A i_array_init(&uidlist->records, 128);
1273N/A uidlist->files = hash_table_create(default_pool, default_pool, 4096,
1273N/A maildir_filename_base_hash,
1273N/A maildir_filename_base_cmp);
1273N/A uidlist->next_uid = 1;
1273N/A uidlist->hdr_extensions = str_new(default_pool, 128);
1273N/A
1273N/A uidlist->dotlock_settings.use_io_notify = TRUE;
1273N/A uidlist->dotlock_settings.use_excl_lock =
1273N/A mbox->box.storage->set->dotlock_use_excl;
1273N/A uidlist->dotlock_settings.nfs_flush =
1273N/A mbox->box.storage->set->mail_nfs_storage;
1273N/A uidlist->dotlock_settings.timeout =
1273N/A mail_storage_get_lock_timeout(&mbox->storage->storage,
1273N/A MAILDIR_UIDLIST_LOCK_STALE_TIMEOUT + 2);
1273N/A uidlist->dotlock_settings.stale_timeout =
1273N/A MAILDIR_UIDLIST_LOCK_STALE_TIMEOUT;
1273N/A uidlist->dotlock_settings.callback = dotlock_callback;
1273N/A uidlist->dotlock_settings.context = &mbox->box;
1273N/A uidlist->dotlock_settings.temp_prefix = mbox->storage->temp_prefix;
1273N/A return uidlist;
}
static void maildir_uidlist_close(struct maildir_uidlist *uidlist)
{
struct mail_storage *storage = uidlist->mbox->box.storage;
if (uidlist->fd != -1) {
if (close(uidlist->fd) < 0) {
mail_storage_set_critical(storage,
"close(%s) failed: %m", uidlist->path);
}
uidlist->fd = -1;
uidlist->fd_ino = 0;
}
uidlist->last_read_offset = 0;
uidlist->read_line_count = 0;
}
static void maildir_uidlist_reset(struct maildir_uidlist *uidlist)
{
maildir_uidlist_close(uidlist);
uidlist->last_seen_uid = 0;
uidlist->initial_hdr_read = FALSE;
uidlist->read_records_count = 0;
hash_table_clear(uidlist->files, FALSE);
array_clear(&uidlist->records);
}
void maildir_uidlist_deinit(struct maildir_uidlist **_uidlist)
{
struct maildir_uidlist *uidlist = *_uidlist;
i_assert(!UIDLIST_IS_LOCKED(uidlist));
*_uidlist = NULL;
maildir_uidlist_update(uidlist);
maildir_uidlist_close(uidlist);
hash_table_destroy(&uidlist->files);
if (uidlist->record_pool != NULL)
pool_unref(&uidlist->record_pool);
array_free(&uidlist->records);
str_free(&uidlist->hdr_extensions);
i_free(uidlist->path);
i_free(uidlist);
}
static int maildir_uid_cmp(struct maildir_uidlist_rec *const *rec1,
struct maildir_uidlist_rec *const *rec2)
{
return (*rec1)->uid < (*rec2)->uid ? -1 :
(*rec1)->uid > (*rec2)->uid ? 1 : 0;
}
static void ATTR_FORMAT(2, 3)
maildir_uidlist_set_corrupted(struct maildir_uidlist *uidlist,
const char *fmt, ...)
{
struct mail_storage *storage = uidlist->mbox->box.storage;
va_list args;
va_start(args, fmt);
if (uidlist->retry_rewind) {
mail_storage_set_critical(storage,
"Broken or unexpectedly changed file %s "
"line %u: %s - re-reading from beginning",
uidlist->path, uidlist->read_line_count,
t_strdup_vprintf(fmt, args));
} else {
mail_storage_set_critical(storage, "Broken file %s line %u: %s",
uidlist->path, uidlist->read_line_count,
t_strdup_vprintf(fmt, args));
}
va_end(args);
}
static void maildir_uidlist_update_hdr(struct maildir_uidlist *uidlist,
const struct stat *st)
{
struct maildir_index_header *mhdr;
if (uidlist->mbox == NULL) {
/* dbox is using this */
return;
}
mhdr = &uidlist->mbox->maildir_hdr;
if (mhdr->uidlist_mtime == 0 && uidlist->version != UIDLIST_VERSION) {
/* upgrading from older verson. don't update the
uidlist times until it uses the new format */
uidlist->recreate = TRUE;
return;
}
mhdr->uidlist_mtime = st->st_mtime;
mhdr->uidlist_mtime_nsecs = ST_MTIME_NSEC(*st);
mhdr->uidlist_size = st->st_size;
}
static unsigned int
maildir_uidlist_records_array_delete(struct maildir_uidlist *uidlist,
struct maildir_uidlist_rec *rec)
{
struct maildir_uidlist_rec *const *recs, *const *pos;
unsigned int idx, count;
recs = array_get(&uidlist->records, &count);
if (!uidlist->unsorted) {
pos = array_bsearch(&uidlist->records, &rec, maildir_uid_cmp);
i_assert(pos != NULL);
idx = pos - recs;
} else {
for (idx = 0; idx < count; idx++) {
if (recs[idx]->uid == rec->uid)
break;
}
i_assert(idx != count);
}
array_delete(&uidlist->records, idx, 1);
return idx;
}
static bool
maildir_uidlist_read_extended(struct maildir_uidlist *uidlist,
const char **line_p,
struct maildir_uidlist_rec *rec)
{
const char *start, *line = *line_p;
buffer_t *buf;
buf = buffer_create_dynamic(pool_datastack_create(), 128);
while (*line != '\0' && *line != ':') {
/* skip over an extension field */
start = line;
while (*line != ' ' && *line != '\0') line++;
buffer_append(buf, start, line - start);
buffer_append_c(buf, '\0');
while (*line == ' ') line++;
}
if (buf->used > 0) {
/* save the extensions */
buffer_append_c(buf, '\0');
rec->extensions = p_malloc(uidlist->record_pool, buf->used);
memcpy(rec->extensions, buf->data, buf->used);
}
if (*line == ':')
line++;
if (*line == '\0')
return FALSE;
*line_p = line;
return TRUE;
}
static bool maildir_uidlist_next(struct maildir_uidlist *uidlist,
const char *line)
{
struct maildir_uidlist_rec *rec, *old_rec, *const *recs;
unsigned int count;
uint32_t uid;
uid = 0;
while (*line >= '0' && *line <= '9') {
uid = uid*10 + (*line - '0');
line++;
}
if (uid == 0 || *line != ' ') {
/* invalid file */
maildir_uidlist_set_corrupted(uidlist, "Invalid data: %s",
line);
return FALSE;
}
if (uid <= uidlist->prev_read_uid) {
maildir_uidlist_set_corrupted(uidlist,
"UIDs not ordered (%u >= %u)",
uid, uidlist->prev_read_uid);
return FALSE;
}
if (uid >= (uint32_t)-1) {
maildir_uidlist_set_corrupted(uidlist,
"UID too high (%u)", uid);
return FALSE;
}
uidlist->prev_read_uid = uid;
if (uid <= uidlist->last_seen_uid) {
/* we already have this */
return TRUE;
}
uidlist->last_seen_uid = uid;
if (uid >= uidlist->next_uid && uidlist->version == 1) {
maildir_uidlist_set_corrupted(uidlist,
"UID larger than next_uid (%u >= %u)",
uid, uidlist->next_uid);
return FALSE;
}
rec = p_new(uidlist->record_pool, struct maildir_uidlist_rec, 1);
rec->uid = uid;
rec->flags = MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;
while (*line == ' ') line++;
if (uidlist->version == UIDLIST_VERSION) {
/* read extended fields */
bool ret;
T_BEGIN {
ret = maildir_uidlist_read_extended(uidlist, &line,
rec);
} T_END;
if (!ret) {
maildir_uidlist_set_corrupted(uidlist,
"Invalid extended fields: %s", line);
return FALSE;
}
}
if (strchr(line, '/') != NULL) {
maildir_uidlist_set_corrupted(uidlist,
"%s: Broken filename at line %u: %s",
uidlist->path, uidlist->read_line_count, line);
return FALSE;
}
old_rec = hash_table_lookup(uidlist->files, line);
if (old_rec == NULL) {
/* no conflicts */
} else if (old_rec->uid == uid) {
/* most likely this is a record we saved ourself, but couldn't
update last_seen_uid because uidlist wasn't refreshed while
it was locked.
another possibility is a duplicate file record. currently
it would be a bug, but not that big of a deal. also perhaps
in future such duplicate lines could be used to update
extended fields. so just let it through anyway.
we'll waste a bit of memory here by allocating the record
twice, but that's not really a problem. */
rec->filename = old_rec->filename;
hash_table_insert(uidlist->files, rec->filename, rec);
uidlist->unsorted = TRUE;
return TRUE;
} else {
/* This can happen if expunged file is moved back and the file
was appended to uidlist. */
i_warning("%s: Duplicate file entry at line %u: "
"%s (uid %u -> %u)%s",
uidlist->path, uidlist->read_line_count, line,
old_rec->uid, uid, uidlist->retry_rewind ?
" - retrying by re-reading from beginning" : "");
if (uidlist->retry_rewind)
return FALSE;
/* Delete the old UID */
maildir_uidlist_records_array_delete(uidlist, old_rec);
/* Replace the old record with this new one */
*old_rec = *rec;
rec = old_rec;
uidlist->recreate = TRUE;
}
recs = array_get(&uidlist->records, &count);
if (count > 0 && recs[count-1]->uid > uid) {
/* we most likely have some records in the array that we saved
ourself without refreshing uidlist */
uidlist->unsorted = TRUE;
}
rec->filename = p_strdup(uidlist->record_pool, line);
hash_table_insert(uidlist->files, rec->filename, rec);
array_append(&uidlist->records, &rec, 1);
return TRUE;
}
static int
maildir_uidlist_read_v3_header(struct maildir_uidlist *uidlist,
const char *line,
unsigned int *uid_validity_r,
unsigned int *next_uid_r)
{
buffer_t *buf;
char key;
str_truncate(uidlist->hdr_extensions, 0);
while (*line != '\0') {
const char *value;
key = *line;
value = ++line;
while (*line != '\0' && *line != ' ') line++;
value = t_strdup_until(value, line);
switch (key) {
case MAILDIR_UIDLIST_HDR_EXT_UID_VALIDITY:
*uid_validity_r = strtoul(value, NULL, 10);
break;
case MAILDIR_UIDLIST_HDR_EXT_NEXT_UID:
*next_uid_r = strtoul(value, NULL, 10);
break;
case MAILDIR_UIDLIST_HDR_EXT_GUID:
buf = buffer_create_dynamic(pool_datastack_create(),
MAIL_GUID_128_SIZE);
if (hex_to_binary(value, buf) < 0 ||
buf->used != MAIL_GUID_128_SIZE) {
maildir_uidlist_set_corrupted(uidlist,
"Invalid mailbox GUID: %s", value);
return -1;
}
memcpy(uidlist->mailbox_guid, buf->data,
sizeof(uidlist->mailbox_guid));
uidlist->have_mailbox_guid = TRUE;
break;
default:
if (str_len(uidlist->hdr_extensions) > 0)
str_append_c(uidlist->hdr_extensions, ' ');
str_printfa(uidlist->hdr_extensions,
"%c%s", key, value);
break;
}
while (*line == ' ') line++;
}
return 0;
}
static int maildir_uidlist_read_header(struct maildir_uidlist *uidlist,
struct istream *input)
{
unsigned int uid_validity = 0, next_uid = 0;
const char *line;
int ret;
line = i_stream_read_next_line(input);
if (line == NULL) {
/* I/O error / empty file */
return input->stream_errno == 0 ? 0 : -1;
}
uidlist->read_line_count = 1;
if (*line < '0' || *line > '9' || line[1] != ' ') {
maildir_uidlist_set_corrupted(uidlist,
"Corrupted header (invalid version number)");
return 0;
}
uidlist->version = *line - '0';
line += 2;
switch (uidlist->version) {
case 1:
if (sscanf(line, "%u %u", &uid_validity, &next_uid) != 2) {
maildir_uidlist_set_corrupted(uidlist,
"Corrupted header (version 1)");
return 0;
}
break;
case UIDLIST_VERSION:
T_BEGIN {
ret = maildir_uidlist_read_v3_header(uidlist, line,
&uid_validity,
&next_uid);
} T_END;
if (ret < 0)
return 0;
break;
default:
maildir_uidlist_set_corrupted(uidlist, "Unsupported version %u",
uidlist->version);
return 0;
}
if (uid_validity == 0 || next_uid == 0) {
maildir_uidlist_set_corrupted(uidlist,
"Broken header (uidvalidity = %u, next_uid=%u)",
uid_validity, next_uid);
return 0;
}
if (uid_validity == uidlist->uid_validity &&
next_uid < uidlist->hdr_next_uid) {
maildir_uidlist_set_corrupted(uidlist,
"next_uid header was lowered (%u -> %u)",
uidlist->hdr_next_uid, next_uid);
return 0;
}
uidlist->uid_validity = uid_validity;
uidlist->next_uid = next_uid;
uidlist->hdr_next_uid = next_uid;
return 1;
}
static void maildir_uidlist_records_sort_by_uid(struct maildir_uidlist *uidlist)
{
array_sort(&uidlist->records, maildir_uid_cmp);
uidlist->unsorted = FALSE;
}
static int
maildir_uidlist_update_read(struct maildir_uidlist *uidlist,
bool *retry_r, bool try_retry)
{
struct mail_storage *storage = uidlist->mbox->box.storage;
const char *line;
uint32_t orig_next_uid, orig_uid_validity;
struct istream *input;
struct stat st;
uoff_t last_read_offset;
int fd, ret;
*retry_r = FALSE;
if (uidlist->fd == -1) {
fd = nfs_safe_open(uidlist->path, O_RDWR);
if (fd == -1) {
if (errno != ENOENT) {
mail_storage_set_critical(storage,
"open(%s) failed: %m", uidlist->path);
return -1;
}
return 0;
}
last_read_offset = 0;
} else {
/* the file was updated */
fd = uidlist->fd;
if (lseek(fd, 0, SEEK_SET) < 0) {
if (errno == ESTALE && try_retry) {
*retry_r = TRUE;
return -1;
}
mail_storage_set_critical(storage,
"lseek(%s) failed: %m", uidlist->path);
return -1;
}
uidlist->fd = -1;
uidlist->fd_ino = 0;
last_read_offset = uidlist->last_read_offset;
uidlist->last_read_offset = 0;
}
if (fstat(fd, &st) < 0) {
close_keep_errno(fd);
if (errno == ESTALE && try_retry) {
*retry_r = TRUE;
return -1;
}
mail_storage_set_critical(storage,
"fstat(%s) failed: %m", uidlist->path);
return -1;
}
if (uidlist->record_pool == NULL) {
uidlist->record_pool =
pool_alloconly_create(MEMPOOL_GROWING
"uidlist record_pool",
nearest_power(st.st_size -
st.st_size/8));
}
input = i_stream_create_fd(fd, 4096, FALSE);
i_stream_seek(input, last_read_offset);
orig_uid_validity = uidlist->uid_validity;
orig_next_uid = uidlist->next_uid;
ret = input->v_offset != 0 ? 1 :
maildir_uidlist_read_header(uidlist, input);
if (ret > 0) {
uidlist->prev_read_uid = 0;
uidlist->change_counter++;
uidlist->retry_rewind = last_read_offset != 0 && try_retry;
ret = 1;
while ((line = i_stream_read_next_line(input)) != NULL) {
uidlist->read_records_count++;
uidlist->read_line_count++;
if (!maildir_uidlist_next(uidlist, line)) {
if (!uidlist->retry_rewind)
ret = 0;
else {
ret = -1;
*retry_r = TRUE;
}
break;
}
}
uidlist->retry_rewind = FALSE;
if (input->stream_errno != 0)
ret = -1;
if (uidlist->unsorted) {
uidlist->recreate_on_change = TRUE;
maildir_uidlist_records_sort_by_uid(uidlist);
}
if (uidlist->next_uid <= uidlist->prev_read_uid)
uidlist->next_uid = uidlist->prev_read_uid + 1;
if (ret > 0 && uidlist->uid_validity != orig_uid_validity &&
orig_uid_validity != 0) {
uidlist->recreate = TRUE;
} else if (ret > 0 && uidlist->next_uid < orig_next_uid) {
mail_storage_set_critical(storage,
"%s: next_uid was lowered (%u -> %u, hdr=%u)",
uidlist->path, orig_next_uid,
uidlist->next_uid, uidlist->hdr_next_uid);
uidlist->recreate = TRUE;
uidlist->next_uid = orig_next_uid;
}
}
if (ret == 0) {
/* file is broken */
(void)unlink(uidlist->path);
} else if (ret > 0) {
/* success */
uidlist->fd = fd;
uidlist->fd_dev = st.st_dev;
uidlist->fd_ino = st.st_ino;
uidlist->fd_size = st.st_size;
uidlist->last_read_offset = input->v_offset;
maildir_uidlist_update_hdr(uidlist, &st);
} else if (!*retry_r) {
/* I/O error */
if (input->stream_errno == ESTALE && try_retry)
*retry_r = TRUE;
else {
errno = input->stream_errno;
mail_storage_set_critical(storage,
"read(%s) failed: %m", uidlist->path);
}
uidlist->last_read_offset = 0;
}
i_stream_destroy(&input);
if (ret <= 0) {
if (close(fd) < 0) {
mail_storage_set_critical(storage,
"close(%s) failed: %m", uidlist->path);
}
}
return ret;
}
static int
maildir_uidlist_stat(struct maildir_uidlist *uidlist, struct stat *st_r)
{
struct mail_storage *storage = uidlist->mbox->box.storage;
if (storage->set->mail_nfs_storage) {
nfs_flush_file_handle_cache(uidlist->path);
nfs_flush_attr_cache_unlocked(uidlist->path);
}
if (nfs_safe_stat(uidlist->path, st_r) < 0) {
if (errno != ENOENT) {
mail_storage_set_critical(storage,
"stat(%s) failed: %m", uidlist->path);
return -1;
}
return 0;
}
return 1;
}
static int
maildir_uidlist_has_changed(struct maildir_uidlist *uidlist, bool *recreated_r)
{
struct mail_storage *storage = uidlist->mbox->box.storage;
struct stat st;
int ret;
*recreated_r = FALSE;
if ((ret = maildir_uidlist_stat(uidlist, &st)) <= 0)
return ret < 0 ? -1 : 1;
if (st.st_ino != uidlist->fd_ino ||
!CMP_DEV_T(st.st_dev, uidlist->fd_dev)) {
/* file recreated */
*recreated_r = TRUE;
return 1;
}
if (storage->set->mail_nfs_storage) {
/* NFS: either the file hasn't been changed, or it has already
been deleted and the inodes just happen to be the same.
check if the fd is still valid. */
if (fstat(uidlist->fd, &st) < 0) {
if (errno == ESTALE) {
*recreated_r = TRUE;
return 1;
}
mail_storage_set_critical(storage,
"fstat(%s) failed: %m", uidlist->path);
return -1;
}
}
if (st.st_size != uidlist->fd_size) {
/* file modified but not recreated */
return 1;
} else {
/* unchanged */
return 0;
}
}
static int maildir_uidlist_open_latest(struct maildir_uidlist *uidlist)
{
bool recreated;
int ret;
if (uidlist->fd != -1) {
ret = maildir_uidlist_has_changed(uidlist, &recreated);
if (ret <= 0) {
if (UIDLIST_IS_LOCKED(uidlist))
uidlist->locked_refresh = TRUE;
return ret < 0 ? -1 : 1;
}
if (!recreated)
return 0;
maildir_uidlist_close(uidlist);
}
uidlist->fd = nfs_safe_open(uidlist->path, O_RDWR);
if (uidlist->fd == -1 && errno != ENOENT) {
mail_storage_set_critical(uidlist->mbox->box.storage,
"open(%s) failed: %m", uidlist->path);
return -1;
}
return 0;
}
int maildir_uidlist_refresh(struct maildir_uidlist *uidlist)
{
unsigned int i;
bool retry;
int ret;
if (maildir_uidlist_open_latest(uidlist) < 0)
return -1;
for (i = 0; ; i++) {
ret = maildir_uidlist_update_read(uidlist, &retry,
i < UIDLIST_ESTALE_RETRY_COUNT);
if (!retry)
break;
/* ESTALE - try reopening and rereading */
maildir_uidlist_close(uidlist);
}
if (ret >= 0) {
uidlist->initial_read = TRUE;
uidlist->initial_hdr_read = TRUE;
if (UIDLIST_IS_LOCKED(uidlist))
uidlist->locked_refresh = TRUE;
if (!uidlist->have_mailbox_guid) {
uidlist->recreate = TRUE;
(void)maildir_uidlist_update(uidlist);
}
}
return ret;
}
int maildir_uidlist_refresh_fast_init(struct maildir_uidlist *uidlist)
{
const struct maildir_index_header *mhdr = &uidlist->mbox->maildir_hdr;
struct mail_index *index = uidlist->mbox->box.index;
struct mail_index_view *view;
const struct mail_index_header *hdr;
struct stat st;
int ret;
i_assert(UIDLIST_IS_LOCKED(uidlist));
if (uidlist->fd != -1)
return maildir_uidlist_refresh(uidlist);
if ((ret = maildir_uidlist_stat(uidlist, &st)) < 0)
return ret;
if (ret > 0 && st.st_size == mhdr->uidlist_size &&
st.st_mtime == (time_t)mhdr->uidlist_mtime &&
ST_NTIMES_EQUAL(ST_MTIME_NSEC(st), mhdr->uidlist_mtime_nsecs) &&
(!mail_index_is_in_memory(index) || st.st_mtime < ioloop_time-1)) {
/* index is up-to-date. look up the uidvalidity and next-uid
from it. we'll need to create a new view temporarily to
make sure we get the latest values. */
view = mail_index_view_open(index);
hdr = mail_index_get_header(view);
uidlist->uid_validity = hdr->uid_validity;
uidlist->next_uid = hdr->next_uid;
uidlist->initial_hdr_read = TRUE;
mail_index_view_close(&view);
if (UIDLIST_IS_LOCKED(uidlist))
uidlist->locked_refresh = TRUE;
return 1;
} else {
return maildir_uidlist_refresh(uidlist);
}
}
static int
maildir_uid_bsearch_cmp(const uint32_t *uidp,
struct maildir_uidlist_rec *const *recp)
{
return *uidp < (*recp)->uid ? -1 :
*uidp > (*recp)->uid ? 1 : 0;
}
static int
maildir_uidlist_lookup_rec(struct maildir_uidlist *uidlist, uint32_t uid,
struct maildir_uidlist_rec **rec_r)
{
struct maildir_uidlist_rec *const *pos;
if (!uidlist->initial_read) {
/* first time we need to read uidlist */
if (maildir_uidlist_refresh(uidlist) < 0)
return -1;
}
pos = array_bsearch(&uidlist->records, &uid,
maildir_uid_bsearch_cmp);
if (pos == NULL) {
*rec_r = NULL;
return 0;
}
*rec_r = *pos;
return 1;
}
int maildir_uidlist_lookup(struct maildir_uidlist *uidlist, uint32_t uid,
enum maildir_uidlist_rec_flag *flags_r,
const char **fname_r)
{
int ret;
ret = maildir_uidlist_lookup_nosync(uidlist, uid, flags_r, fname_r);
if (ret <= 0) {
if (ret < 0)
return -1;
if (uidlist->fd != -1 || uidlist->mbox == NULL) {
/* refresh uidlist and check again in case it was added
after the last mailbox sync */
if (maildir_uidlist_refresh(uidlist) < 0)
return -1;
} else {
/* the uidlist doesn't exist. */
if (maildir_storage_sync_force(uidlist->mbox, uid) < 0)
return -1;
}
/* try again */
ret = maildir_uidlist_lookup_nosync(uidlist, uid,
flags_r, fname_r);
}
return ret;
}
int maildir_uidlist_lookup_nosync(struct maildir_uidlist *uidlist, uint32_t uid,
enum maildir_uidlist_rec_flag *flags_r,
const char **fname_r)
{
struct maildir_uidlist_rec *rec;
int ret;
if ((ret = maildir_uidlist_lookup_rec(uidlist, uid, &rec)) <= 0)
return ret;
*flags_r = rec->flags;
*fname_r = rec->filename;
return 1;
}
const char *
maildir_uidlist_lookup_ext(struct maildir_uidlist *uidlist, uint32_t uid,
enum maildir_uidlist_rec_ext_key key)
{
struct maildir_uidlist_rec *rec;
const unsigned char *p;
int ret;
ret = maildir_uidlist_lookup_rec(uidlist, uid, &rec);
if (ret <= 0 || rec->extensions == NULL)
return NULL;
p = rec->extensions;
while (*p != '\0') {
/* <key><value>\0 */
if (*p == (unsigned char)key)
return (const char *)p + 1;
p += strlen((const char *)p) + 1;
}
return NULL;
}
uint32_t maildir_uidlist_get_uid_validity(struct maildir_uidlist *uidlist)
{
return uidlist->uid_validity;
}
uint32_t maildir_uidlist_get_next_uid(struct maildir_uidlist *uidlist)
{
return !uidlist->initial_hdr_read ? 0 : uidlist->next_uid;
}
int maildir_uidlist_get_mailbox_guid(struct maildir_uidlist *uidlist,
uint8_t mailbox_guid[MAIL_GUID_128_SIZE])
{
if (!uidlist->have_mailbox_guid) {
uidlist->recreate = TRUE;
if (maildir_uidlist_update(uidlist) < 0)
return -1;
}
memcpy(mailbox_guid, uidlist->mailbox_guid, MAIL_GUID_128_SIZE);
return 0;
}
void maildir_uidlist_set_mailbox_guid(struct maildir_uidlist *uidlist,
const uint8_t mailbox_guid[MAIL_GUID_128_SIZE])
{
if (memcmp(uidlist->mailbox_guid, mailbox_guid,
sizeof(uidlist->mailbox_guid)) != 0) {
memcpy(uidlist->mailbox_guid, mailbox_guid,
sizeof(uidlist->mailbox_guid));
uidlist->recreate = TRUE;
}
}
void maildir_uidlist_set_uid_validity(struct maildir_uidlist *uidlist,
uint32_t uid_validity)
{
i_assert(uid_validity != 0);
if (uid_validity != uidlist->uid_validity) {
uidlist->uid_validity = uid_validity;
uidlist->recreate = TRUE;
}
}
void maildir_uidlist_set_next_uid(struct maildir_uidlist *uidlist,
uint32_t next_uid, bool force)
{
if (uidlist->next_uid < next_uid || force) {
i_assert(next_uid != 0);
uidlist->next_uid = next_uid;
uidlist->recreate = TRUE;
}
}
static void
maildir_uidlist_set_ext_real(struct maildir_uidlist *uidlist, uint32_t uid,
enum maildir_uidlist_rec_ext_key key,
const char *value)
{
struct maildir_uidlist_rec *rec;
const unsigned char *p;
buffer_t *buf;
unsigned int len;
int ret;
ret = maildir_uidlist_lookup_rec(uidlist, uid, &rec);
if (ret <= 0) {
if (ret < 0)
return;
/* maybe it's a new message */
if (maildir_uidlist_refresh(uidlist) < 0)
return;
if (maildir_uidlist_lookup_rec(uidlist, uid, &rec) <= 0) {
/* message is already expunged, ignore */
return;
}
}
buf = buffer_create_dynamic(pool_datastack_create(), 128);
/* copy existing extensions, except for the one we're updating */
if (rec->extensions != NULL) {
p = rec->extensions;
while (*p != '\0') {
/* <key><value>\0 */
len = strlen((const char *)p) + 1;
if (*p != (unsigned char)key)
buffer_append(buf, p, len);
p += len;
}
}
if (value != NULL) {
buffer_append_c(buf, key);
buffer_append(buf, value, strlen(value) + 1);
}
buffer_append_c(buf, '\0');
rec->extensions = p_malloc(uidlist->record_pool, buf->used);
memcpy(rec->extensions, buf->data, buf->used);
if (rec->uid != (uint32_t)-1) {
/* message already exists in uidlist, need to recreate it */
uidlist->recreate = TRUE;
}
}
void maildir_uidlist_set_ext(struct maildir_uidlist *uidlist, uint32_t uid,
enum maildir_uidlist_rec_ext_key key,
const char *value)
{
T_BEGIN {
maildir_uidlist_set_ext_real(uidlist, uid, key, value);
} T_END;
}
static void
maildir_uidlist_generate_uid_validity(struct maildir_uidlist *uidlist)
{
const struct mail_index_header *hdr;
if (uidlist->mbox->box.opened) {
hdr = mail_index_get_header(uidlist->mbox->box.view);
if (hdr->uid_validity != 0) {
uidlist->uid_validity = hdr->uid_validity;
return;
}
}
uidlist->uid_validity =
maildir_get_uidvalidity_next(uidlist->mbox->box.list);
}
static int maildir_uidlist_write_fd(struct maildir_uidlist *uidlist, int fd,
const char *path, unsigned int first_idx,
uoff_t *file_size_r)
{
struct mail_storage *storage = uidlist->mbox->box.storage;
struct maildir_uidlist_iter_ctx *iter;
struct ostream *output;
struct maildir_uidlist_rec *rec;
string_t *str;
const unsigned char *p;
unsigned int len;
int ret;
i_assert(fd != -1);
output = o_stream_create_fd_file(fd, (uoff_t)-1, FALSE);
o_stream_cork(output);
str = t_str_new(512);
if (output->offset == 0) {
i_assert(first_idx == 0);
uidlist->version = UIDLIST_VERSION;
if (uidlist->uid_validity == 0)
maildir_uidlist_generate_uid_validity(uidlist);
if (!uidlist->have_mailbox_guid)
mail_generate_guid_128(uidlist->mailbox_guid);
i_assert(uidlist->next_uid > 0);
str_printfa(str, "%u V%u N%u G%s", uidlist->version,
uidlist->uid_validity, uidlist->next_uid,
binary_to_hex(uidlist->mailbox_guid,
sizeof(uidlist->mailbox_guid)));
if (str_len(uidlist->hdr_extensions) > 0) {
str_append_c(str, ' ');
str_append_str(str, uidlist->hdr_extensions);
}
str_append_c(str, '\n');
o_stream_send(output, str_data(str), str_len(str));
}
iter = maildir_uidlist_iter_init(uidlist);
i_assert(first_idx <= array_count(&uidlist->records));
iter->next += first_idx;
while (maildir_uidlist_iter_next_rec(iter, &rec)) {
uidlist->read_records_count++;
str_truncate(str, 0);
str_printfa(str, "%u", rec->uid);
if (rec->extensions != NULL) {
for (p = rec->extensions; *p != '\0'; ) {
len = strlen((const char *)p);
str_append_c(str, ' ');
str_append_n(str, p, len);
p += len + 1;
}
}
str_printfa(str, " :%s\n", rec->filename);
o_stream_send(output, str_data(str), str_len(str));
}
maildir_uidlist_iter_deinit(&iter);
o_stream_flush(output);
ret = output->stream_errno == 0 ? 0 : -1;
*file_size_r = output->offset;
o_stream_unref(&output);
if (ret < 0) {
mail_storage_set_critical(storage,
"o_stream_send(%s) failed: %m", path);
return -1;
}
if (storage->set->parsed_fsync_mode != FSYNC_MODE_NEVER) {
if (fdatasync(fd) < 0) {
mail_storage_set_critical(storage,
"fdatasync(%s) failed: %m", path);
return -1;
}
}
return 0;
}
static void
maildir_uidlist_records_drop_expunges(struct maildir_uidlist *uidlist)
{
struct mail_index_view *view;
struct maildir_uidlist_rec *const *recs;
ARRAY_TYPE(maildir_uidlist_rec_p) new_records;
const struct mail_index_header *hdr;
const struct mail_index_record *rec;
unsigned int i, count;
uint32_t seq;
/* we could get here when opening and locking mailbox,
before index files have been opened. */
if (!uidlist->mbox->box.opened)
return;
mail_index_refresh(uidlist->mbox->box.index);
view = mail_index_view_open(uidlist->mbox->box.index);
count = array_count(&uidlist->records);
hdr = mail_index_get_header(view);
if (count * UIDLIST_COMPRESS_PERCENTAGE / 100 <= hdr->messages_count) {
/* too much trouble to be worth it */
mail_index_view_close(&view);
return;
}
i_array_init(&new_records, hdr->messages_count + 64);
recs = array_get(&uidlist->records, &count);
for (i = 0, seq = 1; i < count && seq <= hdr->messages_count; ) {
rec = mail_index_lookup(view, seq);
if (recs[i]->uid < rec->uid) {
/* expunged entry */
hash_table_remove(uidlist->files, recs[i]->filename);
i++;
} else if (recs[i]->uid > rec->uid) {
/* index isn't up to date. we're probably just
syncing it here. ignore this entry. */
seq++;
} else {
array_append(&new_records, &recs[i], 1);
seq++; i++;
}
}
/* drop messages expunged at the end of index */
while (i < count && recs[i]->uid < hdr->next_uid) {
hash_table_remove(uidlist->files, recs[i]->filename);
i++;
}
/* view might not be completely up-to-date, so preserve any
messages left */
for (; i < count; i++)
array_append(&new_records, &recs[i], 1);
array_free(&uidlist->records);
uidlist->records = new_records;
mail_index_view_close(&view);
}
static int maildir_uidlist_recreate(struct maildir_uidlist *uidlist)
{
struct mailbox *box = &uidlist->mbox->box;
const char *control_dir, *temp_path;
struct stat st;
mode_t old_mask;
uoff_t file_size;
int i, fd, ret;
i_assert(uidlist->initial_read);
maildir_uidlist_records_drop_expunges(uidlist);
control_dir = mailbox_list_get_path(box->list, box->name,
MAILBOX_LIST_PATH_TYPE_CONTROL);
temp_path = t_strconcat(control_dir,
"/" MAILDIR_UIDLIST_NAME ".tmp", NULL);
for (i = 0;; i++) {
old_mask = umask(0777 & ~box->file_create_mode);
fd = open(temp_path, O_RDWR | O_CREAT | O_TRUNC, 0777);
umask(old_mask);
if (fd != -1)
break;
if (errno != ENOENT || i == MAILDIR_DELETE_RETRY_COUNT ||
uidlist->mbox == NULL) {
mail_storage_set_critical(box->storage,
"open(%s, O_CREAT) failed: %m", temp_path);
return -1;
}
/* the control dir doesn't exist. create it unless the whole
mailbox was just deleted. */
if (!maildir_set_deleted(&uidlist->mbox->box))
return -1;
}
if (box->file_create_gid != (gid_t)-1 &&
fchown(fd, (uid_t)-1, box->file_create_gid) < 0) {
if (errno == EPERM) {
mail_storage_set_critical(box->storage, "%s",
eperm_error_get_chgrp("fchown", temp_path,
box->file_create_gid,
box->file_create_gid_origin));
} else {
mail_storage_set_critical(box->storage,
"fchown(%s) failed: %m", temp_path);
}
}
uidlist->read_records_count = 0;
ret = maildir_uidlist_write_fd(uidlist, fd, temp_path, 0, &file_size);
if (ret == 0) {
if (rename(temp_path, uidlist->path) < 0) {
mail_storage_set_critical(box->storage,
"rename(%s, %s) failed: %m",
temp_path, uidlist->path);
ret = -1;
}
}
if (ret < 0) {
if (unlink(temp_path) < 0) {
mail_storage_set_critical(box->storage,
"unlink(%s) failed: %m", temp_path);
}
} else if (fstat(fd, &st) < 0) {
mail_storage_set_critical(box->storage,
"fstat(%s) failed: %m", temp_path);
ret = -1;
} else if (file_size != (uoff_t)st.st_size) {
i_assert(!file_dotlock_is_locked(uidlist->dotlock));
mail_storage_set_critical(box->storage,
"Maildir uidlist dotlock overridden: %s",
uidlist->path);
ret = -1;
} else {
maildir_uidlist_close(uidlist);
uidlist->fd = fd;
uidlist->fd_dev = st.st_dev;
uidlist->fd_ino = st.st_ino;
uidlist->fd_size = st.st_size;
uidlist->last_read_offset = st.st_size;
uidlist->recreate = FALSE;
uidlist->recreate_on_change = FALSE;
uidlist->have_mailbox_guid = TRUE;
maildir_uidlist_update_hdr(uidlist, &st);
}
if (ret < 0)
(void)close(fd);
return ret;
}
int maildir_uidlist_update(struct maildir_uidlist *uidlist)
{
int ret;
if (!uidlist->recreate)
return 0;
if (maildir_uidlist_lock(uidlist) <= 0)
return -1;
ret = maildir_uidlist_recreate(uidlist);
maildir_uidlist_unlock(uidlist);
return ret;
}
static bool maildir_uidlist_want_compress(struct maildir_uidlist_sync_ctx *ctx)
{
struct mail_index_view *view = ctx->uidlist->mbox->box.view;
unsigned int min_rewrite_count, messages_count;
if (!ctx->uidlist->locked_refresh)
return FALSE;
if (ctx->uidlist->recreate)
return TRUE;
min_rewrite_count =
(ctx->uidlist->read_records_count + ctx->new_files_count) *
UIDLIST_COMPRESS_PERCENTAGE / 100;
messages_count = I_MIN(mail_index_view_get_messages_count(view),
array_count(&ctx->uidlist->records));
return min_rewrite_count >= messages_count;
}
static bool maildir_uidlist_want_recreate(struct maildir_uidlist_sync_ctx *ctx)
{
struct maildir_uidlist *uidlist = ctx->uidlist;
if (!uidlist->locked_refresh || !uidlist->initial_read)
return FALSE;
if (ctx->finish_change_counter != uidlist->change_counter)
return TRUE;
if (uidlist->fd == -1 || uidlist->version != UIDLIST_VERSION ||
!uidlist->have_mailbox_guid)
return TRUE;
return maildir_uidlist_want_compress(ctx);
}
static int maildir_uidlist_sync_update(struct maildir_uidlist_sync_ctx *ctx)
{
struct maildir_uidlist *uidlist = ctx->uidlist;
struct mail_storage *storage = uidlist->mbox->box.storage;
struct stat st;
uoff_t file_size;
if (maildir_uidlist_want_recreate(ctx) || uidlist->recreate_on_change)
return maildir_uidlist_recreate(uidlist);
if (!uidlist->locked_refresh || uidlist->fd == -1) {
/* make sure we have the latest file (e.g. NOREFRESH used) */
i_assert(uidlist->initial_hdr_read);
if (maildir_uidlist_open_latest(uidlist) < 0)
return -1;
}
i_assert(ctx->first_unwritten_pos != (unsigned int)-1);
if (lseek(uidlist->fd, 0, SEEK_END) < 0) {
mail_storage_set_critical(storage,
"lseek(%s) failed: %m", uidlist->path);
return -1;
}
if (maildir_uidlist_write_fd(uidlist, uidlist->fd, uidlist->path,
ctx->first_unwritten_pos, &file_size) < 0)
return -1;
if (fstat(uidlist->fd, &st) < 0) {
mail_storage_set_critical(storage,
"fstat(%s) failed: %m", uidlist->path);
return -1;
}
if ((uoff_t)st.st_size != file_size) {
i_warning("%s: file size changed unexpectedly after write",
uidlist->path);
} else if (uidlist->locked_refresh) {
uidlist->fd_size = st.st_size;
uidlist->last_read_offset = st.st_size;
maildir_uidlist_update_hdr(uidlist, &st);
}
return 0;
}
static void maildir_uidlist_mark_all(struct maildir_uidlist *uidlist,
bool nonsynced)
{
struct maildir_uidlist_rec **recs;
unsigned int i, count;
recs = array_get_modifiable(&uidlist->records, &count);
if (nonsynced) {
for (i = 0; i < count; i++)
recs[i]->flags |= MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;
} else {
for (i = 0; i < count; i++)
recs[i]->flags &= ~MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;
}
}
static int maildir_uidlist_sync_lock(struct maildir_uidlist *uidlist,
enum maildir_uidlist_sync_flags sync_flags,
bool *locked_r)
{
bool nonblock, refresh;
int ret;
*locked_r = FALSE;
if ((sync_flags & MAILDIR_UIDLIST_SYNC_NOLOCK) != 0) {
if (maildir_uidlist_refresh(uidlist) < 0)
return -1;
return 1;
}
nonblock = (sync_flags & MAILDIR_UIDLIST_SYNC_TRYLOCK) != 0;
refresh = (sync_flags & MAILDIR_UIDLIST_SYNC_NOREFRESH) == 0;
ret = maildir_uidlist_lock_timeout(uidlist, nonblock, refresh, refresh);
if (ret <= 0) {
if (ret < 0 || !nonblock)
return ret;
/* couldn't lock it */
if ((sync_flags & MAILDIR_UIDLIST_SYNC_FORCE) == 0)
return 0;
/* forcing the sync anyway */
if (maildir_uidlist_refresh(uidlist) < 0)
return -1;
} else {
*locked_r = TRUE;
}
return 1;
}
void maildir_uidlist_set_all_nonsynced(struct maildir_uidlist *uidlist)
{
maildir_uidlist_mark_all(uidlist, TRUE);
}
int maildir_uidlist_sync_init(struct maildir_uidlist *uidlist,
enum maildir_uidlist_sync_flags sync_flags,
struct maildir_uidlist_sync_ctx **sync_ctx_r)
{
struct maildir_uidlist_sync_ctx *ctx;
bool locked;
int ret;
ret = maildir_uidlist_sync_lock(uidlist, sync_flags, &locked);
if (ret <= 0)
return ret;
*sync_ctx_r = ctx = i_new(struct maildir_uidlist_sync_ctx, 1);
ctx->uidlist = uidlist;
ctx->sync_flags = sync_flags;
ctx->partial = (!locked && ctx->uidlist->mbox != NULL) ||
(sync_flags & MAILDIR_UIDLIST_SYNC_PARTIAL) != 0;
ctx->locked = locked;
ctx->first_unwritten_pos = (unsigned int)-1;
ctx->first_new_pos = (unsigned int)-1;
if (ctx->partial) {
if ((sync_flags & MAILDIR_UIDLIST_SYNC_KEEP_STATE) == 0) {
/* initially mark all nonsynced */
maildir_uidlist_mark_all(uidlist, TRUE);
}
return 1;
}
i_assert(uidlist->locked_refresh);
ctx->record_pool = pool_alloconly_create(MEMPOOL_GROWING
"maildir_uidlist_sync", 16384);
ctx->files = hash_table_create(default_pool, ctx->record_pool, 4096,
maildir_filename_base_hash,
maildir_filename_base_cmp);
i_array_init(&ctx->records, array_count(&uidlist->records));
return 1;
}
static int
maildir_uidlist_sync_next_partial(struct maildir_uidlist_sync_ctx *ctx,
const char *filename, uint32_t uid,
enum maildir_uidlist_rec_flag flags)
{
struct maildir_uidlist *uidlist = ctx->uidlist;
struct maildir_uidlist_rec *rec;
/* we'll update uidlist directly */
rec = hash_table_lookup(uidlist->files, filename);
if (rec == NULL) {
/* doesn't exist in uidlist */
if (!ctx->locked) {
/* we can't add it, so just ignore it */
return 1;
}
if (ctx->first_new_pos == (unsigned int)-1)
ctx->first_new_pos = array_count(&uidlist->records);
ctx->new_files_count++;
ctx->changed = TRUE;
if (uidlist->record_pool == NULL) {
uidlist->record_pool =
pool_alloconly_create(MEMPOOL_GROWING
"uidlist record_pool",
1024);
}
rec = p_new(uidlist->record_pool,
struct maildir_uidlist_rec, 1);
rec->uid = (uint32_t)-1;
array_append(&uidlist->records, &rec, 1);
uidlist->change_counter++;
}
if (uid != 0) {
if (rec->uid != uid && rec->uid != (uint32_t)-1) {
mail_storage_set_critical(uidlist->mbox->box.storage,
"Maildir: %s changed UID %u -> %u",
filename, rec->uid, uid);
return -1;
}
rec->uid = uid;
if (uidlist->next_uid <= uid)
uidlist->next_uid = uid + 1;
}
rec->flags = (rec->flags | flags) & ~MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;
rec->filename = p_strdup(uidlist->record_pool, filename);
hash_table_insert(uidlist->files, rec->filename, rec);
ctx->finished = FALSE;
return 1;
}
static unsigned char *ext_dup(pool_t pool, const unsigned char *extensions)
{
unsigned char *ret;
if (extensions == NULL)
return NULL;
T_BEGIN {
unsigned int len;
for (len = 0; extensions[len] != '\0'; len++) {
while (extensions[len] != '\0') len++;
}
ret = p_malloc(pool, len + 1);
memcpy(ret, extensions, len);
} T_END;
return ret;
}
int maildir_uidlist_sync_next(struct maildir_uidlist_sync_ctx *ctx,
const char *filename,
enum maildir_uidlist_rec_flag flags)
{
return maildir_uidlist_sync_next_uid(ctx, filename, 0, flags);
}
int maildir_uidlist_sync_next_uid(struct maildir_uidlist_sync_ctx *ctx,
const char *filename, uint32_t uid,
enum maildir_uidlist_rec_flag flags)
{
struct maildir_uidlist *uidlist = ctx->uidlist;
struct maildir_uidlist_rec *rec, *old_rec;
const char *p, *dir;
if (ctx->failed)
return -1;
for (p = filename; *p != '\0'; p++) {
if (*p == 13 || *p == 10) {
struct mailbox *box = &uidlist->mbox->box;
dir = mailbox_list_get_path(box->list, box->name,
MAILBOX_LIST_PATH_TYPE_MAILBOX);
i_warning("Maildir %s: Ignoring a file with #0x%x: %s",
dir, *p, filename);
return 1;
}
}
if (ctx->partial) {
return maildir_uidlist_sync_next_partial(ctx, filename,
uid, flags);
}
rec = hash_table_lookup(ctx->files, filename);
if (rec != NULL) {
if ((rec->flags & (MAILDIR_UIDLIST_REC_FLAG_NEW_DIR |
MAILDIR_UIDLIST_REC_FLAG_MOVED)) == 0) {
/* possibly duplicate */
return 0;
}
/* probably was in new/ and now we're seeing it in cur/.
remove new/moved flags so if this happens again we'll know
to check for duplicates. */
rec->flags &= ~(MAILDIR_UIDLIST_REC_FLAG_NEW_DIR |
MAILDIR_UIDLIST_REC_FLAG_MOVED);
} else {
old_rec = hash_table_lookup(uidlist->files, filename);
i_assert(old_rec != NULL || UIDLIST_ALLOW_WRITING(uidlist));
rec = p_new(ctx->record_pool, struct maildir_uidlist_rec, 1);
if (old_rec != NULL) {
*rec = *old_rec;
rec->extensions =
ext_dup(ctx->record_pool, rec->extensions);
} else {
rec->uid = (uint32_t)-1;
ctx->new_files_count++;
ctx->changed = TRUE;
/* didn't exist in uidlist, it's recent */
flags |= MAILDIR_UIDLIST_REC_FLAG_RECENT;
}
array_append(&ctx->records, &rec, 1);
}
if (uid != 0) {
rec->uid = uid;
if (uidlist->next_uid <= uid)
uidlist->next_uid = uid + 1;
}
rec->flags = (rec->flags | flags) & ~MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;
rec->filename = p_strdup(ctx->record_pool, filename);
hash_table_insert(ctx->files, rec->filename, rec);
return 1;
}
void maildir_uidlist_sync_remove(struct maildir_uidlist_sync_ctx *ctx,
const char *filename)
{
struct maildir_uidlist_rec *rec;
unsigned int idx;
i_assert(ctx->partial);
i_assert(ctx->uidlist->locked_refresh);
rec = hash_table_lookup(ctx->uidlist->files, filename);
i_assert(rec != NULL);
i_assert(rec->uid != (uint32_t)-1);
hash_table_remove(ctx->uidlist->files, filename);
idx = maildir_uidlist_records_array_delete(ctx->uidlist, rec);
if (ctx->first_unwritten_pos != (unsigned int)-1) {
i_assert(ctx->first_unwritten_pos > idx);
ctx->first_unwritten_pos--;
}
if (ctx->first_new_pos != (unsigned int)-1) {
i_assert(ctx->first_new_pos > idx);
ctx->first_new_pos--;
}
ctx->changed = TRUE;
ctx->uidlist->recreate = TRUE;
}
const char *
maildir_uidlist_sync_get_full_filename(struct maildir_uidlist_sync_ctx *ctx,
const char *filename)
{
struct maildir_uidlist_rec *rec;
rec = hash_table_lookup(ctx->files, filename);
return rec == NULL ? NULL : rec->filename;
}
bool maildir_uidlist_get_uid(struct maildir_uidlist *uidlist,
const char *filename, uint32_t *uid_r)
{
struct maildir_uidlist_rec *rec;
rec = hash_table_lookup(uidlist->files, filename);
if (rec == NULL)
return FALSE;
*uid_r = rec->uid;
return TRUE;
}
const char *
maildir_uidlist_get_full_filename(struct maildir_uidlist *uidlist,
const char *filename)
{
struct maildir_uidlist_rec *rec;
rec = hash_table_lookup(uidlist->files, filename);
return rec == NULL ? NULL : rec->filename;
}
static int maildir_assign_uid_cmp(const void *p1, const void *p2)
{
const struct maildir_uidlist_rec *const *rec1 = p1, *const *rec2 = p2;
if ((*rec1)->uid != (*rec2)->uid) {
if ((*rec1)->uid < (*rec2)->uid)
return -1;
else
return 1;
}
return maildir_filename_sort_cmp((*rec1)->filename, (*rec2)->filename);
}
static void maildir_uidlist_assign_uids(struct maildir_uidlist_sync_ctx *ctx)
{
struct maildir_uidlist_rec **recs;
unsigned int dest, count;
i_assert(UIDLIST_ALLOW_WRITING(ctx->uidlist));
i_assert(ctx->first_new_pos != (unsigned int)-1);
if (ctx->first_unwritten_pos == (unsigned int)-1)
ctx->first_unwritten_pos = ctx->first_new_pos;
/* sort new files and assign UIDs for them */
recs = array_get_modifiable(&ctx->uidlist->records, &count);
qsort(recs + ctx->first_new_pos, count - ctx->first_new_pos,
sizeof(*recs), maildir_assign_uid_cmp);
for (dest = ctx->first_new_pos; dest < count; dest++) {
if (recs[dest]->uid == (uint32_t)-1)
break;
}
for (; dest < count; dest++) {
i_assert(recs[dest]->uid == (uint32_t)-1);
i_assert(ctx->uidlist->next_uid < (uint32_t)-1);
recs[dest]->uid = ctx->uidlist->next_uid++;
recs[dest]->flags &= ~MAILDIR_UIDLIST_REC_FLAG_MOVED;
}
if (ctx->uidlist->locked_refresh && ctx->uidlist->initial_read)
ctx->uidlist->last_seen_uid = ctx->uidlist->next_uid-1;
ctx->new_files_count = 0;
ctx->first_new_pos = (unsigned int)-1;
ctx->uidlist->change_counter++;
ctx->finish_change_counter = ctx->uidlist->change_counter;
}
static void maildir_uidlist_swap(struct maildir_uidlist_sync_ctx *ctx)
{
struct maildir_uidlist *uidlist = ctx->uidlist;
/* buffer is unsorted, sort it by UID */
array_sort(&ctx->records, maildir_uid_cmp);
array_free(&uidlist->records);
uidlist->records = ctx->records;
ctx->records.arr.buffer = NULL;
hash_table_destroy(&uidlist->files);
uidlist->files = ctx->files;
ctx->files = NULL;
if (uidlist->record_pool != NULL)
pool_unref(&uidlist->record_pool);
uidlist->record_pool = ctx->record_pool;
ctx->record_pool = NULL;
if (ctx->new_files_count != 0) {
ctx->first_new_pos = array_count(&uidlist->records) -
ctx->new_files_count;
maildir_uidlist_assign_uids(ctx);
} else {
ctx->uidlist->change_counter++;
}
}
void maildir_uidlist_sync_recreate(struct maildir_uidlist_sync_ctx *ctx)
{
ctx->uidlist->recreate = TRUE;
}
void maildir_uidlist_sync_finish(struct maildir_uidlist_sync_ctx *ctx)
{
if (!ctx->partial) {
if (!ctx->failed)
maildir_uidlist_swap(ctx);
} else {
if (ctx->new_files_count != 0 && !ctx->failed) {
i_assert(ctx->changed);
i_assert(ctx->locked);
maildir_uidlist_assign_uids(ctx);
}
}
ctx->finished = TRUE;
/* mbox=NULL means we're coming from dbox rebuilding code.
the dbox is already locked, so allow uidlist recreation */
i_assert(ctx->locked || !ctx->changed || ctx->uidlist->mbox == NULL);
if ((ctx->changed || maildir_uidlist_want_compress(ctx)) &&
!ctx->failed && (ctx->locked || ctx->uidlist->mbox == NULL)) {
T_BEGIN {
if (maildir_uidlist_sync_update(ctx) < 0) {
/* we couldn't write everything we wanted. make
sure we don't continue using those UIDs */
maildir_uidlist_reset(ctx->uidlist);
ctx->failed = TRUE;
}
} T_END;
}
}
int maildir_uidlist_sync_deinit(struct maildir_uidlist_sync_ctx **_ctx,
bool success)
{
struct maildir_uidlist_sync_ctx *ctx = *_ctx;
int ret;
*_ctx = NULL;
if (!success)
ctx->failed = TRUE;
ret = ctx->failed ? -1 : 0;
if (!ctx->finished)
maildir_uidlist_sync_finish(ctx);
if (ctx->partial)
maildir_uidlist_mark_all(ctx->uidlist, FALSE);
if (ctx->locked)
maildir_uidlist_unlock(ctx->uidlist);
if (ctx->files != NULL)
hash_table_destroy(&ctx->files);
if (ctx->record_pool != NULL)
pool_unref(&ctx->record_pool);
if (array_is_created(&ctx->records))
array_free(&ctx->records);
i_free(ctx);
return ret;
}
void maildir_uidlist_add_flags(struct maildir_uidlist *uidlist,
const char *filename,
enum maildir_uidlist_rec_flag flags)
{
struct maildir_uidlist_rec *rec;
rec = hash_table_lookup(uidlist->files, filename);
i_assert(rec != NULL);
rec->flags |= flags;
}
struct maildir_uidlist_iter_ctx *
maildir_uidlist_iter_init(struct maildir_uidlist *uidlist)
{
struct maildir_uidlist_iter_ctx *ctx;
unsigned int count;
ctx = i_new(struct maildir_uidlist_iter_ctx, 1);
ctx->uidlist = uidlist;
ctx->next = array_get(&uidlist->records, &count);
ctx->end = ctx->next + count;
ctx->change_counter = ctx->uidlist->change_counter;
return ctx;
}
static void
maildir_uidlist_iter_update_idx(struct maildir_uidlist_iter_ctx *ctx)
{
unsigned int old_rev_idx, idx, count;
old_rev_idx = ctx->end - ctx->next;
ctx->next = array_get(&ctx->uidlist->records, &count);
ctx->end = ctx->next + count;
idx = old_rev_idx >= count ? 0 :
count - old_rev_idx;
while (idx < count && ctx->next[idx]->uid <= ctx->prev_uid)
idx++;
while (idx > 0 && ctx->next[idx-1]->uid > ctx->prev_uid)
idx--;
ctx->next += idx;
}
static bool maildir_uidlist_iter_next_rec(struct maildir_uidlist_iter_ctx *ctx,
struct maildir_uidlist_rec **rec_r)
{
struct maildir_uidlist_rec *rec;
if (ctx->change_counter != ctx->uidlist->change_counter)
maildir_uidlist_iter_update_idx(ctx);
if (ctx->next == ctx->end)
return FALSE;
rec = *ctx->next;
i_assert(rec->uid != (uint32_t)-1);
ctx->prev_uid = rec->uid;
ctx->next++;
*rec_r = rec;
return TRUE;
}
bool maildir_uidlist_iter_next(struct maildir_uidlist_iter_ctx *ctx,
uint32_t *uid_r,
enum maildir_uidlist_rec_flag *flags_r,
const char **filename_r)
{
struct maildir_uidlist_rec *rec;
if (!maildir_uidlist_iter_next_rec(ctx, &rec))
return FALSE;
*uid_r = rec->uid;
*flags_r = rec->flags;
*filename_r = rec->filename;
return TRUE;
}
void maildir_uidlist_iter_deinit(struct maildir_uidlist_iter_ctx **_ctx)
{
i_free(*_ctx);
*_ctx = NULL;
}