-/*
- Unix SMB/Netbios implementation.
- Version 3.0
+/*
+ Unix SMB/CIFS implementation.
stat cache code
Copyright (C) Andrew Tridgell 1992-2000
- Copyright (C) Jeremy Allison 1999-200
-
-
+ Copyright (C) Jeremy Allison 1999-2007
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
+ Copyright (C) Volker Lendecke 2007
+
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
+ the Free Software Foundation; either version 3 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.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
-
-extern BOOL case_sensitive;
-
+#include "memcache.h"
+#include "smbd/smbd.h"
+#include "messages.h"
+#include "smbprofile.h"
/****************************************************************************
Stat cache code used in unix_convert.
*****************************************************************************/
-static int global_stat_cache_lookups;
-static int global_stat_cache_misses;
-static int global_stat_cache_hits;
-
-/****************************************************************************
- Stat cache statistics code.
-*****************************************************************************/
+/**
+ * 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 print_stat_cache_statistics(void)
+void stat_cache_add( const char *full_orig_name,
+ char *translated_path,
+ bool case_sensitive)
{
- double eff;
-
- if(global_stat_cache_lookups == 0)
- return;
+ size_t translated_path_length;
+ char *original_path;
+ size_t original_path_length;
+ char saved_char;
+ TALLOC_CTX *ctx = talloc_tos();
+
+ if (!lp_stat_cache()) {
+ return;
+ }
+
+ /*
+ * Don't cache trivial valid directory entries such as . and ..
+ */
+
+ if ((*full_orig_name == '\0')
+ || ISDOT(full_orig_name) || ISDOTDOT(full_orig_name)) {
+ return;
+ }
+
+ /*
+ * If we are in case insentive mode, we don't need to
+ * store names that need no translation - else, it
+ * would be a waste.
+ */
+
+ if (case_sensitive && (strcmp(full_orig_name, translated_path) == 0)) {
+ return;
+ }
+
+ /*
+ * Remove any trailing '/' characters from the
+ * translated path.
+ */
+
+ translated_path_length = strlen(translated_path);
+
+ if(translated_path[translated_path_length-1] == '/') {
+ translated_path_length--;
+ }
+
+ if(case_sensitive) {
+ original_path = talloc_strdup(ctx,full_orig_name);
+ } else {
+ original_path = talloc_strdup_upper(ctx,full_orig_name);
+ }
+
+ if (!original_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 (original_path_length != translated_path_length) {
+ if (original_path_length < translated_path_length) {
+ DEBUG(0, ("OOPS - tried to store stat cache entry "
+ "for weird length paths [%s] %lu and [%s] %lu)!\n",
+ original_path,
+ (unsigned long)original_path_length,
+ translated_path,
+ (unsigned long)translated_path_length));
+ TALLOC_FREE(original_path);
+ return;
+ }
+
+ /* we only want to index by 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;
+ }
+
+ /* Ensure we're null terminated. */
+ saved_char = translated_path[translated_path_length];
+ translated_path[translated_path_length] = '\0';
+
+ /*
+ * New entry or replace old entry.
+ */
+
+ memcache_add(
+ smbd_memcache(), STAT_CACHE,
+ data_blob_const(original_path, original_path_length),
+ data_blob_const(translated_path, translated_path_length + 1));
+
+ DEBUG(5,("stat_cache_add: Added entry (%lx:size %x) %s -> %s\n",
+ (unsigned long)translated_path,
+ (unsigned int)translated_path_length,
+ original_path,
+ translated_path));
+
+ translated_path[translated_path_length] = saved_char;
+ TALLOC_FREE(original_path);
+}
- eff = (100.0* (double)global_stat_cache_hits)/(double)global_stat_cache_lookups;
+/**
+ * Look through the stat cache for an entry
+ *
+ * @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. We assume that
+ * it is a talloc'ed string from top of stack, we free it if
+ * necessary.
+ * @param dirpath The path as far as the stat cache told us. Also talloced
+ * from top of stack.
+ * @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.
+ *
+ */
- DEBUG(0,("stat cache stats: lookups = %d, hits = %d, misses = %d, \
-stat cache was %f%% effective.\n", global_stat_cache_lookups,
- global_stat_cache_hits, global_stat_cache_misses, eff ));
+bool stat_cache_lookup(connection_struct *conn,
+ char **pp_name,
+ char **pp_dirpath,
+ char **pp_start,
+ SMB_STRUCT_STAT *pst)
+{
+ char *chk_name;
+ size_t namelen;
+ bool sizechanged = False;
+ unsigned int num_components = 0;
+ char *translated_path;
+ size_t translated_path_length;
+ DATA_BLOB data_val;
+ char *name;
+ TALLOC_CTX *ctx = talloc_tos();
+ struct smb_filename smb_fname;
+
+ *pp_dirpath = NULL;
+ *pp_start = *pp_name;
+
+ if (!lp_stat_cache()) {
+ return False;
+ }
+
+ name = *pp_name;
+ namelen = strlen(name);
+
+ DO_PROFILE_INC(statcache_lookups);
+
+ /*
+ * Don't lookup trivial valid directory entries.
+ */
+ if ((*name == '\0') || ISDOT(name) || ISDOTDOT(name)) {
+ return False;
+ }
+
+ if (conn->case_sensitive) {
+ chk_name = talloc_strdup(ctx,name);
+ if (!chk_name) {
+ DEBUG(0, ("stat_cache_lookup: strdup failed!\n"));
+ return False;
+ }
+
+ } else {
+ chk_name = talloc_strdup_upper(ctx,name);
+ if (!chk_name) {
+ DEBUG(0, ("stat_cache_lookup: talloc_strdup_upper failed!\n"));
+ return False;
+ }
+
+ /*
+ * In some language encodings the length changes
+ * if we uppercase. We need to treat this differently
+ * below.
+ */
+ if (strlen(chk_name) != namelen) {
+ sizechanged = True;
+ }
+ }
+
+ while (1) {
+ char *sp;
+
+ data_val = data_blob_null;
+
+ if (memcache_lookup(
+ smbd_memcache(), STAT_CACHE,
+ data_blob_const(chk_name, strlen(chk_name)),
+ &data_val)) {
+ break;
+ }
+
+ DEBUG(10,("stat_cache_lookup: lookup failed for name [%s]\n",
+ chk_name ));
+ /*
+ * Didn't find it - remove last component for next try.
+ */
+ if (!(sp = strrchr_m(chk_name, '/'))) {
+ /*
+ * We reached the end of the name - no match.
+ */
+ DO_PROFILE_INC(statcache_misses);
+ TALLOC_FREE(chk_name);
+ return False;
+ }
+
+ *sp = '\0';
+
+ /*
+ * Count the number of times we have done this, we'll
+ * need it when reconstructing the string.
+ */
+
+ if (sizechanged) {
+ num_components++;
+ }
+
+ if ((*chk_name == '\0')
+ || ISDOT(chk_name) || ISDOTDOT(chk_name)) {
+ DO_PROFILE_INC(statcache_misses);
+ TALLOC_FREE(chk_name);
+ return False;
+ }
+ }
+
+ translated_path = talloc_strdup(ctx,(char *)data_val.data);
+ if (!translated_path) {
+ smb_panic("talloc failed");
+ }
+ translated_path_length = data_val.length - 1;
+
+ DEBUG(10,("stat_cache_lookup: lookup succeeded for name [%s] "
+ "-> [%s]\n", chk_name, translated_path ));
+ DO_PROFILE_INC(statcache_hits);
+
+ ZERO_STRUCT(smb_fname);
+ smb_fname.base_name = translated_path;
+
+ if (SMB_VFS_STAT(conn, &smb_fname) != 0) {
+ /* Discard this entry - it doesn't exist in the filesystem. */
+ memcache_delete(smbd_memcache(), STAT_CACHE,
+ data_blob_const(chk_name, strlen(chk_name)));
+ TALLOC_FREE(chk_name);
+ TALLOC_FREE(translated_path);
+ return False;
+ }
+ *pst = smb_fname.st;
+
+ if (!sizechanged) {
+ memcpy(*pp_name, translated_path,
+ MIN(namelen, translated_path_length));
+ } else {
+ if (num_components == 0) {
+ name = talloc_strndup(ctx, translated_path,
+ translated_path_length);
+ } else {
+ char *sp;
+
+ sp = strnrchr_m(name, '/', num_components);
+ if (sp) {
+ name = talloc_asprintf(ctx,"%.*s%s",
+ (int)translated_path_length,
+ translated_path, sp);
+ } else {
+ name = talloc_strndup(ctx,
+ translated_path,
+ translated_path_length);
+ }
+ }
+ if (name == NULL) {
+ /*
+ * TODO: Get us out of here with a real error message
+ */
+ smb_panic("talloc failed");
+ }
+ TALLOC_FREE(*pp_name);
+ *pp_name = name;
+ }
+
+
+ /* set pointer for 'where to start' on fixing the rest of the name */
+ *pp_start = &name[translated_path_length];
+ if (**pp_start == '/') {
+ ++*pp_start;
+ }
+
+ *pp_dirpath = translated_path;
+ TALLOC_FREE(chk_name);
+ return (namelen == translated_path_length);
}
-typedef struct {
- int name_len;
- char names[2]; /* This is extended via malloc... */
-} stat_cache_entry;
+/***************************************************************************
+ Tell all smbd's to delete an entry.
+**************************************************************************/
-#define INIT_STAT_CACHE_SIZE 512
-static hash_table stat_cache;
+void send_stat_cache_delete_message(struct messaging_context *msg_ctx,
+ const char *name)
+{
+#ifdef DEVELOPER
+ message_send_all(msg_ctx,
+ MSG_SMB_STAT_CACHE_DELETE,
+ name,
+ strlen(name)+1,
+ NULL);
+#endif
+}
-/****************************************************************************
- Add an entry into the stat cache.
-*****************************************************************************/
+/***************************************************************************
+ Delete an entry.
+**************************************************************************/
-void stat_cache_add( char *full_orig_name, char *orig_translated_path)
+void stat_cache_delete(const char *name)
{
- 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)));
+ char *lname = talloc_strdup_upper(talloc_tos(), name);
+
+ if (!lname) {
+ return;
+ }
+ DEBUG(10,("stat_cache_delete: deleting name [%s] -> %s\n",
+ lname, name ));
+
+ memcache_delete(smbd_memcache(), STAT_CACHE,
+ data_blob_const(lname, talloc_get_size(lname)-1));
+ TALLOC_FREE(lname);
}
-/****************************************************************************
- 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.
-*****************************************************************************/
+/***************************************************************
+ Compute a hash value based on a string key value.
+ The function returns the bucket index number for the hashed key.
+ JRA. Use a djb-algorithm hash for speed.
+***************************************************************/
-BOOL stat_cache_lookup(connection_struct *conn, char *name, char *dirpath,
- char **start, SMB_STRUCT_STAT *pst)
+unsigned int fast_string_hash(TDB_DATA *key)
{
- 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;
- global_stat_cache_lookups++;
-
- /*
- * Don't lookup trivial valid directory entries.
- */
- if((*name == '\0') || (strcmp(name, ".") == 0) || (strcmp(name, "..") == 0)) {
- global_stat_cache_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.
- */
- global_stat_cache_misses++;
- return False;
- }
- if((*chk_name == '\0') || (strcmp(chk_name, ".") == 0)
- || (strcmp(chk_name, "..") == 0)) {
- global_stat_cache_misses++;
- return False;
- }
- } else {
- scp = (stat_cache_entry *)(hash_elem->value);
- global_stat_cache_hits++;
- trans_name = scp->names+scp->name_len+1;
- if(conn->vfs_ops.stat(dos_to_unix(trans_name,False), 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);
- }
- }
+ unsigned int n = 0;
+ const char *p;
+ for (p = (const char *)key->dptr; *p != '\0'; p++) {
+ n = ((n << 5) + n) ^ (unsigned int)(*p);
+ }
+ return n;
}
-/*************************************************************************** **
- * Initializes or clears the stat cache.
- *
- * Input: none.
- * Output: none.
- *
- * ************************************************************************** **
- */
-BOOL reset_stat_cache( void )
+/***************************************************************************
+ Initializes or clears the stat cache.
+**************************************************************************/
+
+bool reset_stat_cache( void )
{
- return hash_table_init( &stat_cache, INIT_STAT_CACHE_SIZE, (compare_function)(strcmp));
-} /* reset_stat_cache */
+ if (!lp_stat_cache())
+ return True;
+
+ memcache_flush(smbd_memcache(), STAT_CACHE);
+
+ return True;
+}
git.samba.org / nivanova / samba-autobuild / .git / blobdiff