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/*
Unix SMB/Netbios implementation.
Version 3.0
stat cache code
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Jeremy Allison 1999-200
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern BOOL case_sensitive;
/****************************************************************************
Stat cache code used in unix_convert.
*****************************************************************************/
typedef struct {
int name_len;
char names[2]; /* This is extended via malloc... */
} stat_cache_entry;
#define INIT_STAT_CACHE_SIZE 512
static hash_table stat_cache;
/****************************************************************************
Add an entry into the 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);
/*
* Don't cache trivial valid directory entries.
*/
if((*full_orig_name == '\0') || (strcmp(full_orig_name, ".") == 0) ||
(strcmp(full_orig_name, "..") == 0))
return;
/*
* If we are in case insentive mode, we need to
* store names that need no translation - else, it
* would be a waste.
*/
if(case_sensitive && (strcmp(full_orig_name, orig_translated_path) == 0))
return;
/*
* Remove any trailing '/' characters from the
* translated path.
*/
pstrcpy(translated_path, orig_translated_path);
if(translated_path[namelen-1] == '/') {
translated_path[namelen-1] = '\0';
namelen--;
}
/*
* We will only replace namelen characters
* of full_orig_name.
* StrnCpy always null terminates.
*/
StrnCpy(orig_name, full_orig_name, namelen);
if(!case_sensitive)
strupper( orig_name );
/*
* Check this name doesn't exist in the cache before we
* add it.
*/
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 {
/*
* New entry.
*/
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)));
}
/****************************************************************************
Look through the stat cache for an entry - promote it to the top if found.
Return True if we translated (and did a scuccessful stat on) the entire name.
*****************************************************************************/
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);
/*
* Don't lookup trivial valid directory entries.
*/
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) {
/*
* Didn't find it - remove last component for next try.
*/
sp = strrchr(chk_name, '/');
if (sp) {
*sp = '\0';
} else {
/*
* We reached the end of the name - no match.
*/
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) {
/* Discard this entry - it doesn't exist in the filesystem. */
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);
}
}
}
/*************************************************************************** **
* Initializes or clears the stat cache.
*
* Input: none.
* Output: none.
*
* ************************************************************************** **
*/
BOOL reset_stat_cache( void )
{
static BOOL initialised;
if (!lp_stat_cache()) return True;
if (!initialised) {
initialised = True;
return hash_table_init( &stat_cache, INIT_STAT_CACHE_SIZE, (compare_function)(strcmp));
}
hash_clear(&stat_cache);
return hash_table_init( &stat_cache, INIT_STAT_CACHE_SIZE, (compare_function)(strcmp));
} /* reset_stat_cache */
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