#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "lib/util_file.h"
+#include "lib/util/memcache.h"
/****************************************************************************
Normalise for DOS usage.
/****************************************************************************
Potentially returned cached dfree info.
+
+ Depending on the file system layout and file system features, the free space
+ information can be different for different sub directories underneath a SMB
+ share. Store the cache information in memcache using the query path as the
+ key to accomodate this.
****************************************************************************/
uint64_t get_dfree_info(connection_struct *conn, struct smb_filename *fname,
uint64_t *bsize, uint64_t *dfree, uint64_t *dsize)
{
int dfree_cache_time = lp_dfree_cache_time(SNUM(conn));
- struct dfree_cached_info *dfc = conn->dfree_info;
+ struct dfree_cached_info *dfc = NULL;
+ struct dfree_cached_info dfc_new = { 0 };
uint64_t dfree_ret;
+ char tmpbuf[PATH_MAX];
+ char *full_path = NULL;
+ char *to_free = NULL;
+ char *key_path = NULL;
+ size_t len;
+ DATA_BLOB key, value;
+ bool found;
if (!dfree_cache_time) {
return sys_disk_free(conn, fname, bsize, dfree, dsize);
}
+ len = full_path_tos(conn->connectpath,
+ fname->base_name,
+ tmpbuf,
+ sizeof(tmpbuf),
+ &full_path,
+ &to_free);
+ if (len == -1) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ if (VALID_STAT(fname->st) && S_ISREG(fname->st.st_ex_mode)) {
+ /*
+ * In case of a file use the parent directory to reduce number
+ * of cache entries.
+ */
+ bool ok;
+
+ ok = parent_dirname(talloc_tos(),
+ full_path,
+ &key_path,
+ NULL);
+ TALLOC_FREE(to_free); /* We're done with full_path */
+
+ if (!ok) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ /*
+ * key_path is always a talloced object.
+ */
+ to_free = key_path;
+ } else {
+ /*
+ * key_path might not be a talloced object; rely on
+ * to_free set from full_path_tos.
+ */
+ key_path = full_path;
+ }
+
+ key = data_blob_const(key_path, strlen(key_path));
+ found = memcache_lookup(smbd_memcache(),
+ DFREE_CACHE,
+ key,
+ &value);
+ dfc = found ? (struct dfree_cached_info *)value.data : NULL;
+
if (dfc && (conn->lastused - dfc->last_dfree_time < dfree_cache_time)) {
- /* Return cached info. */
+ DBG_DEBUG("Returning dfree cache entry for %s\n", key_path);
*bsize = dfc->bsize;
*dfree = dfc->dfree;
*dsize = dfc->dsize;
- return dfc->dfree_ret;
+ dfree_ret = dfc->dfree_ret;
+ goto out;
}
dfree_ret = sys_disk_free(conn, fname, bsize, dfree, dsize);
if (dfree_ret == (uint64_t)-1) {
/* Don't cache bad data. */
- return dfree_ret;
- }
-
- /* No cached info or time to refresh. */
- if (!dfc) {
- dfc = talloc(conn, struct dfree_cached_info);
- if (!dfc) {
- return dfree_ret;
- }
- conn->dfree_info = dfc;
+ goto out;
}
- dfc->bsize = *bsize;
- dfc->dfree = *dfree;
- dfc->dsize = *dsize;
- dfc->dfree_ret = dfree_ret;
- dfc->last_dfree_time = conn->lastused;
-
+ DBG_DEBUG("Creating dfree cache entry for %s\n", key_path);
+ dfc_new.bsize = *bsize;
+ dfc_new.dfree = *dfree;
+ dfc_new.dsize = *dsize;
+ dfc_new.dfree_ret = dfree_ret;
+ dfc_new.last_dfree_time = conn->lastused;
+ memcache_add(smbd_memcache(),
+ DFREE_CACHE,
+ key,
+ data_blob_const(&dfc_new, sizeof(dfc_new)));
+
+out:
+ TALLOC_FREE(to_free);
return dfree_ret;
}