2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-2000
5 Copyright (C) Jeremy Allison 1999-2000
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 extern BOOL case_sensitive;
28 /****************************************************************************
29 Stat cache code used in unix_convert.
30 *****************************************************************************/
34 char *translated_path;
35 size_t translated_path_length;
36 char names[2]; /* This is extended via malloc... */
39 #define INIT_STAT_CACHE_SIZE 512
40 static hash_table stat_cache;
42 /****************************************************************************
43 Add an entry into the stat cache.
44 *****************************************************************************/
46 void stat_cache_add( char *full_orig_name, char *orig_translated_path)
48 stat_cache_entry *scp;
49 stat_cache_entry *found_scp;
50 char *translated_path;
51 size_t translated_path_length;
54 size_t original_path_length;
56 hash_element *hash_elem;
58 if (!lp_stat_cache()) return;
61 * Don't cache trivial valid directory entries.
63 if((*full_orig_name == '\0') || (strcmp(full_orig_name, ".") == 0) ||
64 (strcmp(full_orig_name, "..") == 0))
68 * If we are in case insentive mode, we don't need to
69 * store names that need no translation - else, it
73 if(case_sensitive && (strcmp(full_orig_name, orig_translated_path) == 0))
77 * Remove any trailing '/' characters from the
81 translated_path = strdup(orig_translated_path);
85 translated_path_length = strlen(translated_path);
87 if(translated_path[translated_path_length-1] == '/') {
88 translated_path[translated_path_length-1] = '\0';
89 translated_path_length--;
92 original_path = strdup(full_orig_name);
94 SAFE_FREE(translated_path);
98 original_path_length = strlen(original_path);
100 if(original_path[original_path_length-1] == '/') {
101 original_path[original_path_length-1] = '\0';
102 original_path_length--;
106 strupper(original_path);
108 if(!(original_path_length == translated_path_length)) {
109 DEBUG(0, ("OOPS - tried to store stat cache entry for non-equal length paths [%s] %u and [%s] %u)!\n", original_path, original_path_length, translated_path, translated_path_length));
110 SAFE_FREE(original_path);
111 SAFE_FREE(translated_path);
117 * We will only replace namelen characters
119 * StrnCpy always null terminates.
122 smbStrnCpy(orig_name, full_orig_name, namelen);
124 strupper( orig_name );
128 * Check this name doesn't exist in the cache before we
132 if ((hash_elem = hash_lookup(&stat_cache, original_path))) {
133 found_scp = (stat_cache_entry *)(hash_elem->value);
134 if (strcmp((found_scp->translated_path), orig_translated_path) == 0) {
135 /* already in hash table */
136 SAFE_FREE(original_path);
137 SAFE_FREE(translated_path);
140 /* hash collision - remove before we re-add */
141 hash_remove(&stat_cache, hash_elem);
148 if((scp = (stat_cache_entry *)malloc(sizeof(stat_cache_entry)
149 +original_path_length
150 +translated_path_length)) == NULL) {
151 DEBUG(0,("stat_cache_add: Out of memory !\n"));
152 SAFE_FREE(original_path);
153 SAFE_FREE(translated_path);
157 scp->original_path = scp->names;
158 scp->translated_path = scp->names + original_path_length + 1;
159 safe_strcpy(scp->original_path, original_path, original_path_length);
160 safe_strcpy(scp->translated_path, translated_path, translated_path_length);
161 scp->translated_path_length = translated_path_length;
163 hash_insert(&stat_cache, (char *)scp, original_path);
165 SAFE_FREE(original_path);
166 SAFE_FREE(translated_path);
168 DEBUG(5,("stat_cache_add: Added entry %s -> %s\n", scp->original_path, scp->translated_path));
172 * Look through the stat cache for an entry
174 * The hash-table's internals will promote it to the top if found.
176 * @param conn A connection struct to do the stat() with.
177 * @param name The path we are attempting to cache, modified by this routine
178 * to be correct as far as the cache can tell us
179 * @param dirpath The path as far as the stat cache told us.
180 * @param start A pointer into name, for where to 'start' in fixing the rest of the name up.
181 * @param psd A stat buffer, NOT from the cache, but just a side-effect.
183 * @return True if we translated (and did a scuccessful stat on) the entire name.
187 BOOL stat_cache_lookup(connection_struct *conn, pstring name, pstring dirpath,
188 char **start, SMB_STRUCT_STAT *pst)
190 stat_cache_entry *scp;
193 hash_element *hash_elem;
196 if (!lp_stat_cache())
199 namelen = strlen(name);
203 DO_PROFILE_INC(statcache_lookups);
206 * Don't lookup trivial valid directory entries.
208 if((*name == '\0') || (strcmp(name, ".") == 0) || (strcmp(name, "..") == 0)) {
209 DO_PROFILE_INC(statcache_misses);
213 pstrcpy(chk_name, name);
215 strupper( chk_name );
218 hash_elem = hash_lookup(&stat_cache, chk_name);
219 if(hash_elem == NULL) {
221 * Didn't find it - remove last component for next try.
223 sp = strrchr_m(chk_name, '/');
228 * We reached the end of the name - no match.
230 DO_PROFILE_INC(statcache_misses);
233 if((*chk_name == '\0') || (strcmp(chk_name, ".") == 0)
234 || (strcmp(chk_name, "..") == 0)) {
235 DO_PROFILE_INC(statcache_misses);
239 scp = (stat_cache_entry *)(hash_elem->value);
240 DO_PROFILE_INC(statcache_hits);
241 if(vfs_stat(conn,scp->translated_path, pst) != 0) {
242 /* Discard this entry - it doesn't exist in the filesystem. */
243 hash_remove(&stat_cache, hash_elem);
246 memcpy(name, scp->translated_path, MIN(sizeof(pstring)-1, scp->translated_path_length));
248 /* set pointer for 'where to start' on fixing the rest of the name */
249 *start = &name[scp->translated_path_length];
253 pstrcpy(dirpath, scp->translated_path);
254 return (namelen == scp->translated_path_length);
259 /*************************************************************************** **
260 * Initializes or clears the stat cache.
265 * ************************************************************************** **
267 BOOL reset_stat_cache( void )
269 static BOOL initialised;
270 if (!lp_stat_cache()) return True;
273 hash_clear(&stat_cache);
276 initialised = hash_table_init( &stat_cache, INIT_STAT_CACHE_SIZE,
277 (compare_function)(strcmp));
279 } /* reset_stat_cache */