/**
* Synchronize dirty values.
*
* The ``which'' argument is a bitfield indicating the set of things to
* synchronize:
*
* DBMW_SYNC_CACHE requests that dirty values from the local DBMW cache
* be flushed to the DB map layer immediately.
*
* DBMW_SYNC_MAP requests that the DB map layer be flushed, if it is backed
* by disk data.
*
* If DBMW_DELETED_ONLY is specified along with DBMW_SYNC_CACHE, only the
* dirty values that are marked as pending deletion are flushed.
*
* @return amount of value flushes plus amount of sdbm page flushes, -1 if
* an error occurred.
*/
ssize_t
dbmw_sync(dbmw_t *dw, int which)
{
ssize_t amount = 0;
gboolean error = FALSE;
if (which & DBMW_SYNC_CACHE) {
struct flush_context ctx;
ctx.dw = dw;
ctx.error = FALSE;
ctx.deleted_only = booleanize(which & DBMW_DELETED_ONLY);
ctx.amount = 0;
map_foreach(dw->values, flush_dirty, &ctx);
if (!ctx.error)
dw->count_needs_sync = FALSE;
amount += ctx.amount;
error = ctx.error;
}
if (which & DBMW_SYNC_MAP) {
ssize_t ret = dbmap_sync(dw->dm);
if (-1 == ret)
error = TRUE;
else
amount += ret;
}
return error ? -1 : amount;
}
/**
* Synchronize dirty values.
*
* The ``which'' argument is a bitfield indicating the set of things to
* synchronize:
*
* DBMW_SYNC_CACHE requests that dirty values from the local DBMW cache
* be flushed to the DB map layer immediately.
*
* DBMW_SYNC_MAP requests that the DB map layer be flushed, if it is backed
* by disk data.
*
* If DBMW_DELETED_ONLY is specified along with DBMW_SYNC_CACHE, only the
* dirty values that are marked as pending deletion are flushed.
*
* @return amount of value flushes plus amount of sdbm page flushes, -1 if
* an error occurred.
*/
ssize_t
dbmw_sync(dbmw_t *dw, int which)
{
ssize_t amount = 0;
size_t pages = 0, values = 0;
bool error = FALSE;
dbmw_check(dw);
if (which & DBMW_SYNC_CACHE) {
struct flush_context ctx;
ctx.dw = dw;
ctx.error = FALSE;
ctx.deleted_only = booleanize(which & DBMW_DELETED_ONLY);
ctx.amount = 0;
if (dbg_ds_debugging(dw->dbg, 6, DBG_DSF_CACHING)) {
dbg_ds_log(dw->dbg, dw, "%s: syncing cache%s",
G_STRFUNC, ctx.deleted_only ? " (deleted only)" : "");
}
map_foreach(dw->values, flush_dirty, &ctx);
if (!ctx.error && !ctx.deleted_only)
dw->count_needs_sync = FALSE;
/*
* We can safely reset the amount of cached entries to 0, regardless
* of whether we only sync'ed deleted entries: that value is rather
* meaningless when ``count_needs_sync'' is TRUE anyway since we will
* come here first, and we'll then reset it to zero.
*/
dw->cached = 0; /* No more dirty values */
amount += ctx.amount;
values = ctx.amount;
error = ctx.error;
}
if (which & DBMW_SYNC_MAP) {
ssize_t ret;
if (dbg_ds_debugging(dw->dbg, 6, DBG_DSF_CACHING))
dbg_ds_log(dw->dbg, dw, "%s: syncing map", G_STRFUNC);
ret = dbmap_sync(dw->dm);
if (-1 == ret) {
error = TRUE;
} else {
amount += ret;
pages = ret;
}
}
if (dbg_ds_debugging(dw->dbg, 5, DBG_DSF_CACHING)) {
dbg_ds_log(dw->dbg, dw, "%s: %s (flushed %zu value%s, %zu page%s)",
G_STRFUNC, error ? "FAILED" : "OK",
values, plural(values), pages, plural(pages));
}
return error ? -1 : amount;
}
