/*
* __wt_meta_ckptlist_get --
* Load all available checkpoint information for a file.
*/
int
__wt_meta_ckptlist_get(
WT_SESSION_IMPL *session, const char *fname, WT_CKPT **ckptbasep)
{
WT_CKPT *ckpt, *ckptbase;
WT_CONFIG ckptconf;
WT_CONFIG_ITEM k, v;
WT_DECL_ITEM(buf);
WT_DECL_RET;
size_t allocated, slot;
char *config;
*ckptbasep = NULL;
ckptbase = NULL;
allocated = slot = 0;
config = NULL;
/* Retrieve the metadata information for the file. */
WT_RET(__wt_metadata_search(session, fname, &config));
/* Load any existing checkpoints into the array. */
WT_ERR(__wt_scr_alloc(session, 0, &buf));
if (__wt_config_getones(session, config, "checkpoint", &v) == 0) {
__wt_config_subinit(session, &ckptconf, &v);
for (; __wt_config_next(&ckptconf, &k, &v) == 0; ++slot) {
WT_ERR(__wt_realloc_def(
session, &allocated, slot + 1, &ckptbase));
ckpt = &ckptbase[slot];
WT_ERR(__ckpt_load(session, &k, &v, ckpt));
}
}
/*
* Allocate an extra slot for a new value, plus a slot to mark the end.
*
* This isn't very clean, but there's necessary cooperation between the
* schema layer (that maintains the list of checkpoints), the btree
* layer (that knows when the root page is written, creating a new
* checkpoint), and the block manager (which actually creates the
* checkpoint). All of that cooperation is handled in the WT_CKPT
* structure referenced from the WT_BTREE structure.
*/
WT_ERR(__wt_realloc_def(session, &allocated, slot + 2, &ckptbase));
/* Sort in creation-order. */
qsort(ckptbase, slot, sizeof(WT_CKPT), __ckpt_compare_order);
/* Return the array to our caller. */
*ckptbasep = ckptbase;
if (0) {
err: __wt_meta_ckptlist_free(session, &ckptbase);
}
__wt_free(session, config);
__wt_scr_free(session, &buf);
return (ret);
}
/*
* __ckpt_named --
* Return the information associated with a file's named checkpoint.
*/
static int
__ckpt_named(WT_SESSION_IMPL *session,
const char *checkpoint, const char *config, WT_CKPT *ckpt)
{
WT_CONFIG ckptconf;
WT_CONFIG_ITEM k, v;
WT_RET(__wt_config_getones(session, config, "checkpoint", &v));
WT_RET(__wt_config_subinit(session, &ckptconf, &v));
/*
* Take the first match: there should never be more than a single
* checkpoint of any name.
*/
while (__wt_config_next(&ckptconf, &k, &v) == 0)
if (WT_STRING_MATCH(checkpoint, k.str, k.len))
return (__ckpt_load(session, &k, &v, ckpt));
return (WT_NOTFOUND);
}
/*
* __ckpt_last --
* Return the information associated with the file's last checkpoint.
*/
static int
__ckpt_last(WT_SESSION_IMPL *session, const char *config, WT_CKPT *ckpt)
{
WT_CONFIG ckptconf;
WT_CONFIG_ITEM a, k, v;
int64_t found;
WT_RET(__wt_config_getones(session, config, "checkpoint", &v));
WT_RET(__wt_config_subinit(session, &ckptconf, &v));
for (found = 0; __wt_config_next(&ckptconf, &k, &v) == 0;) {
/* Ignore checkpoints before the ones we've already seen. */
WT_RET(__wt_config_subgets(session, &v, "order", &a));
if (found) {
if (a.val < found)
continue;
__wt_meta_checkpoint_free(session, ckpt);
}
found = a.val;
WT_RET(__ckpt_load(session, &k, &v, ckpt));
}
return (found ? 0 : WT_NOTFOUND);
}
