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Merge new statcache.c from HEAD.

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This commit is contained in:
Andrew Bartlett 0001-01-01 00:00:00 +00:00
parent 115cd4b27f
commit 3b9db928fc
1 changed files with 127 additions and 62 deletions
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189
source/smbd/statcache.c
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@ -3,7 +3,7 @@
stat cache code
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Jeremy Allison 1999-2000
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
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
@ -30,30 +30,41 @@ extern BOOL case_sensitive;
*****************************************************************************/
typedef struct {
int name_len;
char names[2]; /* This is extended via malloc... */
char *original_path;
char *translated_path;
size_t translated_path_length;
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.
*****************************************************************************/
/**
* Add an entry into the stat cache.
*
* @param full_orig_name The original name as specified by the client
* @param orig_translated_path The name on our filesystem.
*
* @note Only the first strlen(orig_translated_path) characters are stored
* into the cache. This means that full_orig_name will be internally
* truncated.
*
*/
void stat_cache_add( char *full_orig_name, char *orig_translated_path)
void stat_cache_add( const char *full_orig_name, const char *orig_translated_path)
{
stat_cache_entry *scp;
stat_cache_entry *found_scp;
pstring orig_name;
pstring translated_path;
int namelen;
char *translated_path;
size_t translated_path_length;
char *original_path;
size_t original_path_length;
hash_element *hash_elem;
if (!lp_stat_cache()) return;
namelen = strlen(orig_translated_path);
/*
* Don't cache trivial valid directory entries.
*/
@ -62,7 +73,7 @@ void stat_cache_add( char *full_orig_name, char *orig_translated_path)
return;
/*
* If we are in case insentive mode, we need to
* If we are in case insentive mode, we don't need to
* store names that need no translation - else, it
* would be a waste.
*/
@ -75,74 +86,126 @@ void stat_cache_add( char *full_orig_name, char *orig_translated_path)
* translated path.
*/
pstrcpy(translated_path, orig_translated_path);
if(translated_path[namelen-1] == '/') {
translated_path[namelen-1] = '\0';
namelen--;
translated_path = strdup(orig_translated_path);
if (!translated_path)
return;
translated_path_length = strlen(translated_path);
if(translated_path[translated_path_length-1] == '/') {
translated_path[translated_path_length-1] = '\0';
translated_path_length--;
}
original_path = strdup(full_orig_name);
if (!original_path) {
SAFE_FREE(translated_path);
return;
}
original_path_length = strlen(original_path);
if(original_path[original_path_length-1] == '/') {
original_path[original_path_length-1] = '\0';
original_path_length--;
}
if(!case_sensitive)
strupper(original_path);
if (original_path_length != translated_path_length) {
if (original_path_length < translated_path_length) {
DEBUG(0, ("OOPS - tried to store stat cache entry for werid length paths [%s] %u and [%s] %u)!\n", original_path, original_path_length, translated_path, translated_path_length));
SAFE_FREE(original_path);
SAFE_FREE(translated_path);
return;
}
/* we only want to store the first part of original_path,
up to the length of translated_path */
original_path[translated_path_length] = '\0';
original_path_length = translated_path_length;
}
#if 0
/*
* We will only replace namelen characters
* of full_orig_name.
* StrnCpy always null terminates.
*/
StrnCpy(orig_name, full_orig_name, namelen);
smbStrnCpy(orig_name, full_orig_name, namelen);
if(!case_sensitive)
strupper( orig_name );
#endif
/*
* 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;
}
safe_strcpy(scp->names, orig_name, namelen);
safe_strcpy(scp->names+namelen+1, translated_path, namelen);
scp->name_len = namelen;
hash_insert(&stat_cache, (char *)scp, orig_name);
if ((hash_elem = hash_lookup(&stat_cache, original_path))) {
found_scp = (stat_cache_entry *)(hash_elem->value);
if (strcmp((found_scp->translated_path), orig_translated_path) == 0) {
/* already in hash table */
SAFE_FREE(original_path);
SAFE_FREE(translated_path);
return;
}
/* hash collision - remove before we re-add */
hash_remove(&stat_cache, hash_elem);
}
/*
* New entry.
*/
if((scp = (stat_cache_entry *)malloc(sizeof(stat_cache_entry)
+original_path_length
+translated_path_length)) == NULL) {
DEBUG(0,("stat_cache_add: Out of memory !\n"));
SAFE_FREE(original_path);
SAFE_FREE(translated_path);
return;
}
DEBUG(5,("stat_cache_add: Added entry %s -> %s\n", scp->names, (scp->names+scp->name_len+1)));
scp->original_path = scp->names;
scp->translated_path = scp->names + original_path_length + 1;
safe_strcpy(scp->original_path, original_path, original_path_length);
safe_strcpy(scp->translated_path, translated_path, translated_path_length);
scp->translated_path_length = translated_path_length;
hash_insert(&stat_cache, (char *)scp, original_path);
SAFE_FREE(original_path);
SAFE_FREE(translated_path);
DEBUG(5,("stat_cache_add: Added entry %s -> %s\n", scp->original_path, scp->translated_path));
}
/****************************************************************************
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.
*****************************************************************************/
/**
* Look through the stat cache for an entry
*
* The hash-table's internals will promote it to the top if found.
*
* @param conn A connection struct to do the stat() with.
* @param name The path we are attempting to cache, modified by this routine
* to be correct as far as the cache can tell us
* @param dirpath The path as far as the stat cache told us.
* @param start A pointer into name, for where to 'start' in fixing the rest of the name up.
* @param psd A stat buffer, NOT from the cache, but just a side-effect.
*
* @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,
BOOL stat_cache_lookup(connection_struct *conn, pstring name, pstring dirpath,
char **start, SMB_STRUCT_STAT *pst)
{
stat_cache_entry *scp;
char *trans_name;
pstring chk_name;
int namelen;
size_t namelen;
hash_element *hash_elem;
char *sp;
@ -191,18 +254,20 @@ BOOL stat_cache_lookup(connection_struct *conn, char *name, char *dirpath,
} 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) {
if(vfs_stat(conn,scp->translated_path, 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];
memcpy(name, scp->translated_path, MIN(sizeof(pstring)-1, scp->translated_path_length));
/* set pointer for 'where to start' on fixing the rest of the name */
*start = &name[scp->translated_path_length];
if(**start == '/')
++*start;
StrnCpy( dirpath, trans_name, name - (*start));
return (namelen == scp->name_len);
pstrcpy(dirpath, scp->translated_path);
return (namelen == scp->translated_path_length);
}
}
}