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delay unlocking of .uidvalidity

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it's wasteful to re-lock all the time. instead, unlock in the background
after 1-2 seconds of inactivity.
This commit is contained in:
Oswald Buddenhagen 2015-01-01 13:24:30 +01:00
parent d9a983add6
commit 4aad8c9e04
1 changed files with 26 additions and 16 deletions
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42
src/drv_maildir.c
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@ -74,6 +74,7 @@ typedef struct maildir_store {
#ifdef USE_DB
DB *db;
#endif /* USE_DB */
wakeup_t lcktmr;
} maildir_store_t;
#ifdef USE_DB
@ -139,6 +140,8 @@ maildir_validate_path( const store_conf_t *conf )
return 0;
}
static void lcktmr_timeout( void *aux );
static void
maildir_open_store( store_conf_t *conf, const char *label ATTR_UNUSED,
void (*cb)( store_t *ctx, void *aux ), void *aux )
@ -148,6 +151,7 @@ maildir_open_store( store_conf_t *conf, const char *label ATTR_UNUSED,
ctx = nfcalloc( sizeof(*ctx) );
ctx->gen.conf = conf;
ctx->uvfd = -1;
init_wakeup( &ctx->lcktmr, lcktmr_timeout, ctx );
if (conf->trash) {
if (maildir_validate_path( conf ) < 0) {
free( ctx );
@ -185,13 +189,17 @@ maildir_cleanup( store_t *gctx )
free( ctx->excs );
if (ctx->uvfd >= 0)
close( ctx->uvfd );
conf_wakeup( &ctx->lcktmr, -1 );
}
static void
maildir_disown_store( store_t *gctx )
{
maildir_store_t *ctx = (maildir_store_t *)gctx;
maildir_cleanup( gctx );
free( ((maildir_store_t *)gctx)->trash );
wipe_wakeup( &ctx->lcktmr );
free( ctx->trash );
free_string_list( gctx->boxes );
free( gctx );
}
@ -489,6 +497,7 @@ maildir_store_uid( maildir_store_t *ctx )
error( "Maildir error: cannot write UIDVALIDITY.\n" );
return DRV_BOX_BAD;
}
conf_wakeup( &ctx->lcktmr, 2 );
return DRV_OK;
}
@ -521,6 +530,10 @@ maildir_uidval_lock( maildir_store_t *ctx )
int n;
char buf[128];
if (ctx->lcktmr.links.next) {
/* The unlock timer is active, so we are obviously already locked. */
return DRV_OK;
}
#ifdef LEGACY_FLOCK
/* This is legacy only */
if (flock( ctx->uvfd, LOCK_EX ) < 0) {
@ -553,6 +566,7 @@ maildir_uidval_lock( maildir_store_t *ctx )
return maildir_init_uid_new( ctx );
} else
ctx->uvok = 1;
conf_wakeup( &ctx->lcktmr, 2 );
return DRV_OK;
}
@ -567,6 +581,12 @@ maildir_uidval_unlock( maildir_store_t *ctx )
#endif
}
static void
lcktmr_timeout( void *aux )
{
maildir_uidval_unlock( (maildir_store_t *)aux );
}
static int
maildir_obtain_uid( maildir_store_t *ctx, int *uid )
{
@ -912,10 +932,6 @@ maildir_scan( maildir_store_t *ctx, msglist_t *msglist )
}
ctx->uvok = 1;
}
#ifdef USE_DB
if (!ctx->db)
#endif /* ! USE_DB */
maildir_uidval_unlock( ctx );
return DRV_OK;
}
@ -984,10 +1000,8 @@ maildir_open_box( store_t *gctx,
#endif /* USE_DB */
char uvpath[_POSIX_PATH_MAX];
if ((ret = maildir_validate( gctx->path, 0, ctx )) != DRV_OK) {
cb( ret, aux );
return;
}
if ((ret = maildir_validate( gctx->path, 0, ctx )) != DRV_OK)
goto bail;
nfsnprintf( uvpath, sizeof(uvpath), "%s/.uidvalidity", gctx->path );
#ifndef USE_DB
@ -1060,13 +1074,10 @@ maildir_open_box( store_t *gctx,
}
fnok:
#endif /* USE_DB */
if ((ret = maildir_uidval_lock( ctx )) != DRV_OK) {
cb( ret, aux );
return;
}
maildir_uidval_unlock( ctx );
ret = maildir_uidval_lock( ctx );
cb( DRV_OK, aux );
bail:
cb( ret, aux );
}
static void
@ -1324,7 +1335,6 @@ maildir_store_msg( store_t *gctx, msg_data_t *data, int to_trash,
cb( ret, 0, aux );
return;
}
maildir_uidval_unlock( ctx );
nfsnprintf( base + bl, sizeof(base) - bl, ",U=%d", uid );
}
box = gctx->path;