2 Unix SMB/Netbios implementation.
5 Copyright (C) Andrew Tridgell 1992-2000
6 Copyright (C) Jeremy Allison 1999-200
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 extern BOOL case_sensitive;
29 /****************************************************************************
30 Stat cache code used in unix_convert.
31 *****************************************************************************/
35 char names[2]; /* This is extended via malloc... */
38 #define INIT_STAT_CACHE_SIZE 512
39 static hash_table stat_cache;
41 /****************************************************************************
42 Add an entry into the stat cache.
43 *****************************************************************************/
45 void stat_cache_add( char *full_orig_name, char *orig_translated_path)
47 stat_cache_entry *scp;
48 stat_cache_entry *found_scp;
50 pstring translated_path;
52 hash_element *hash_elem;
54 if (!lp_stat_cache()) return;
56 namelen = strlen(orig_translated_path);
59 * Don't cache trivial valid directory entries.
61 if((*full_orig_name == '\0') || (strcmp(full_orig_name, ".") == 0) ||
62 (strcmp(full_orig_name, "..") == 0))
66 * If we are in case insentive mode, we need to
67 * store names that need no translation - else, it
71 if(case_sensitive && (strcmp(full_orig_name, orig_translated_path) == 0))
75 * Remove any trailing '/' characters from the
79 pstrcpy(translated_path, orig_translated_path);
80 if(translated_path[namelen-1] == '/') {
81 translated_path[namelen-1] = '\0';
86 * We will only replace namelen characters
88 * StrnCpy always null terminates.
91 StrnCpy(orig_name, full_orig_name, namelen);
93 strupper( orig_name );
96 * Check this name doesn't exist in the cache before we
100 if ((hash_elem = hash_lookup(&stat_cache, orig_name))) {
101 found_scp = (stat_cache_entry *)(hash_elem->value);
102 if (strcmp((found_scp->names+found_scp->name_len+1), translated_path) == 0) {
105 hash_remove(&stat_cache, hash_elem);
106 if((scp = (stat_cache_entry *)malloc(sizeof(stat_cache_entry)+2*namelen)) == NULL) {
107 DEBUG(0,("stat_cache_add: Out of memory !\n"));
110 pstrcpy(scp->names, orig_name);
111 pstrcpy((scp->names+namelen+1), translated_path);
112 scp->name_len = namelen;
113 hash_insert(&stat_cache, (char *)scp, orig_name);
122 if((scp = (stat_cache_entry *)malloc(sizeof(stat_cache_entry)+2*namelen)) == NULL) {
123 DEBUG(0,("stat_cache_add: Out of memory !\n"));
126 pstrcpy(scp->names, orig_name);
127 pstrcpy(scp->names+namelen+1, translated_path);
128 scp->name_len = namelen;
129 hash_insert(&stat_cache, (char *)scp, orig_name);
132 DEBUG(5,("stat_cache_add: Added entry %s -> %s\n", scp->names, (scp->names+scp->name_len+1)));
135 /****************************************************************************
136 Look through the stat cache for an entry - promote it to the top if found.
137 Return True if we translated (and did a scuccessful stat on) the entire name.
138 *****************************************************************************/
140 BOOL stat_cache_lookup(connection_struct *conn, char *name, char *dirpath,
141 char **start, SMB_STRUCT_STAT *pst)
143 stat_cache_entry *scp;
147 hash_element *hash_elem;
150 if (!lp_stat_cache())
153 namelen = strlen(name);
157 DO_PROFILE_INC(statcache_lookups);
160 * Don't lookup trivial valid directory entries.
162 if((*name == '\0') || (strcmp(name, ".") == 0) || (strcmp(name, "..") == 0)) {
163 DO_PROFILE_INC(statcache_misses);
167 pstrcpy(chk_name, name);
169 strupper( chk_name );
172 hash_elem = hash_lookup(&stat_cache, chk_name);
173 if(hash_elem == NULL) {
175 * Didn't find it - remove last component for next try.
177 sp = strrchr(chk_name, '/');
182 * We reached the end of the name - no match.
184 DO_PROFILE_INC(statcache_misses);
187 if((*chk_name == '\0') || (strcmp(chk_name, ".") == 0)
188 || (strcmp(chk_name, "..") == 0)) {
189 DO_PROFILE_INC(statcache_misses);
193 scp = (stat_cache_entry *)(hash_elem->value);
194 DO_PROFILE_INC(statcache_hits);
195 trans_name = scp->names+scp->name_len+1;
196 if(conn->vfs_ops.stat(conn,dos_to_unix(trans_name,False), pst) != 0) {
197 /* Discard this entry - it doesn't exist in the filesystem. */
198 hash_remove(&stat_cache, hash_elem);
201 memcpy(name, trans_name, scp->name_len);
202 *start = &name[scp->name_len];
205 StrnCpy( dirpath, trans_name, name - (*start));
206 return (namelen == scp->name_len);
211 /*************************************************************************** **
212 * Initializes or clears the stat cache.
217 * ************************************************************************** **
219 BOOL reset_stat_cache( void )
221 static BOOL initialised;
222 if (!lp_stat_cache()) return True;
226 return hash_table_init( &stat_cache, INIT_STAT_CACHE_SIZE, (compare_function)(strcmp));
228 hash_clear(&stat_cache);
229 return hash_table_init( &stat_cache, INIT_STAT_CACHE_SIZE, (compare_function)(strcmp));
231 } /* reset_stat_cache */