#include "includes.h"
extern BOOL case_sensitive;
typedef struct {
int name_len;
char names[2];
} stat_cache_entry;
#define INIT_STAT_CACHE_SIZE 512
static hash_table stat_cache;
void stat_cache_add( char *full_orig_name, char *orig_translated_path)
{
stat_cache_entry *scp;
stat_cache_entry *found_scp;
pstring orig_name;
pstring translated_path;
int namelen;
hash_element *hash_elem;
if (!lp_stat_cache()) return;
namelen = strlen(orig_translated_path);
if((*full_orig_name == '\0') || (strcmp(full_orig_name, ".") == 0) ||
(strcmp(full_orig_name, "..") == 0))
return;
if(case_sensitive && (strcmp(full_orig_name, orig_translated_path) == 0))
return;
pstrcpy(translated_path, orig_translated_path);
if(translated_path[namelen-1] == '/') {
translated_path[namelen-1] = '\0';
namelen--;
}
StrnCpy(orig_name, full_orig_name, namelen);
if(!case_sensitive)
strupper( orig_name );
if ((hash_elem = hash_lookup(&stat_cache, orig_name))) {
found_scp = (stat_cache_entry *)(hash_elem->value);
if (strcmp((found_scp->names+found_scp->name_len+1), translated_path) == 0) {
return;
} else {
hash_remove(&stat_cache, hash_elem);
if((scp = (stat_cache_entry *)malloc(sizeof(stat_cache_entry)+2*namelen)) == NULL) {
DEBUG(0,("stat_cache_add: Out of memory !\n"));
return;
}
pstrcpy(scp->names, orig_name);
pstrcpy((scp->names+namelen+1), translated_path);
scp->name_len = namelen;
hash_insert(&stat_cache, (char *)scp, orig_name);
}
return;
} else {
if((scp = (stat_cache_entry *)malloc(sizeof(stat_cache_entry)+2*namelen)) == NULL) {
DEBUG(0,("stat_cache_add: Out of memory !\n"));
return;
}
pstrcpy(scp->names, orig_name);
pstrcpy(scp->names+namelen+1, translated_path);
scp->name_len = namelen;
hash_insert(&stat_cache, (char *)scp, orig_name);
}
DEBUG(5,("stat_cache_add: Added entry %s -> %s\n", scp->names, (scp->names+scp->name_len+1)));
}
BOOL stat_cache_lookup(connection_struct *conn, char *name, char *dirpath,
char **start, SMB_STRUCT_STAT *pst)
{
stat_cache_entry *scp;
char *trans_name;
pstring chk_name;
int namelen;
hash_element *hash_elem;
char *sp;
if (!lp_stat_cache())
return False;
namelen = strlen(name);
*start = name;
DO_PROFILE_INC(statcache_lookups);
if((*name == '\0') || (strcmp(name, ".") == 0) || (strcmp(name, "..") == 0)) {
DO_PROFILE_INC(statcache_misses);
return False;
}
pstrcpy(chk_name, name);
if(!case_sensitive)
strupper( chk_name );
while (1) {
hash_elem = hash_lookup(&stat_cache, chk_name);
if(hash_elem == NULL) {
sp = strrchr(chk_name, '/');
if (sp) {
*sp = '\0';
} else {
DO_PROFILE_INC(statcache_misses);
return False;
}
if((*chk_name == '\0') || (strcmp(chk_name, ".") == 0)
|| (strcmp(chk_name, "..") == 0)) {
DO_PROFILE_INC(statcache_misses);
return False;
}
} else {
scp = (stat_cache_entry *)(hash_elem->value);
DO_PROFILE_INC(statcache_hits);
trans_name = scp->names+scp->name_len+1;
if(vfs_stat(conn,trans_name, pst) != 0) {
hash_remove(&stat_cache, hash_elem);
return False;
}
memcpy(name, trans_name, scp->name_len);
*start = &name[scp->name_len];
if(**start == '/')
++*start;
StrnCpy( dirpath, trans_name, name - (*start));
return (namelen == scp->name_len);
}
}
}
BOOL reset_stat_cache( void )
{
static BOOL initialised;
if (!lp_stat_cache()) return True;
if (initialised) {
hash_clear(&stat_cache);
}
initialised = hash_table_init( &stat_cache, INIT_STAT_CACHE_SIZE,
(compare_function)(strcmp));
return initialised;
}