svn commit: samba r15418 - in trunk/source/locking: .
jra at samba.org
jra at samba.org
Wed May 3 16:06:56 GMT 2006
Author: jra
Date: 2006-05-03 16:06:56 +0000 (Wed, 03 May 2006)
New Revision: 15418
WebSVN: http://websvn.samba.org/cgi-bin/viewcvs.cgi?view=rev&root=samba&rev=15418
Log:
Never write the same function twice :-). In a traversal
function we must copy the data before modifying.
Jeremy.
Modified:
trunk/source/locking/brlock.c
Changeset:
Modified: trunk/source/locking/brlock.c
===================================================================
--- trunk/source/locking/brlock.c 2006-05-03 15:19:31 UTC (rev 15417)
+++ trunk/source/locking/brlock.c 2006-05-03 16:06:56 UTC (rev 15418)
@@ -1261,28 +1261,16 @@
}
/****************************************************************************
- Traverse the whole database with this function, calling traverse_callback
- on each lock.
+ Ensure this set of lock entries is valid.
****************************************************************************/
-static int traverse_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
+static BOOL validate_lock_entries(unsigned int *pnum_entries, struct lock_struct **pplocks)
{
- struct lock_struct *locks;
- struct lock_key *key;
unsigned int i;
- unsigned int num_locks = 0;
unsigned int num_valid_entries = 0;
+ struct lock_struct *locks = *pplocks;
- BRLOCK_FN(traverse_callback) = (BRLOCK_FN_CAST())state;
-
- locks = (struct lock_struct *)dbuf.dptr;
- key = (struct lock_key *)kbuf.dptr;
-
- num_locks = dbuf.dsize/sizeof(*locks);
-
- /* Ensure the lock db is clean of invalid processes. */
-
- for (i = 0; i < num_locks; i++) {
+ for (i = 0; i < *pnum_entries; i++) {
struct lock_struct *lock_data = &locks[i];
if (!process_exists(lock_data->context.pid)) {
/* This process no longer exists - mark this
@@ -1293,17 +1281,18 @@
}
}
- if (num_valid_entries != num_locks) {
+ if (num_valid_entries != *pnum_entries) {
struct lock_struct *new_lock_data = NULL;
if (num_valid_entries) {
new_lock_data = SMB_MALLOC_ARRAY(struct lock_struct, num_valid_entries);
if (!new_lock_data) {
DEBUG(3, ("malloc fail\n"));
- return 0;
+ return False;
}
+
num_valid_entries = 0;
- for (i = 0; i < num_locks; i++) {
+ for (i = 0; i < *pnum_entries; i++) {
struct lock_struct *lock_data = &locks[i];
if (lock_data->context.smbpid &&
lock_data->context.tid) {
@@ -1314,10 +1303,52 @@
}
}
}
- SAFE_FREE(dbuf.dptr);
- dbuf.dptr = (void *)new_lock_data;
- dbuf.dsize = (num_valid_entries) * sizeof(*locks);
+ SAFE_FREE(*pplocks);
+ *pplocks = new_lock_data;
+ *pnum_entries = num_valid_entries;
+ }
+
+ return True;
+}
+
+/****************************************************************************
+ Traverse the whole database with this function, calling traverse_callback
+ on each lock.
+****************************************************************************/
+
+static int traverse_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
+{
+ struct lock_struct *locks;
+ struct lock_key *key;
+ unsigned int i;
+ unsigned int num_locks = 0;
+ unsigned int orig_num_locks = 0;
+
+ BRLOCK_FN(traverse_callback) = (BRLOCK_FN_CAST())state;
+
+ /* In a traverse function we must make a copy of
+ dbuf before modifying it. */
+
+ locks = (struct lock_struct *)memdup(dbuf.dptr, dbuf.dsize);
+ if (!locks) {
+ return -1; /* Terminate traversal. */
+ }
+
+ key = (struct lock_key *)kbuf.dptr;
+ orig_num_locks = num_locks = dbuf.dsize/sizeof(*locks);
+
+ /* Ensure the lock db is clean of entries from invalid processes. */
+
+ if (!validate_lock_entries(&num_locks, &locks)) {
+ SAFE_FREE(locks);
+ return -1; /* Terminate traversal */
+ }
+
+ if (orig_num_locks != num_locks) {
+ dbuf.dptr = (void *)locks;
+ dbuf.dsize = num_locks * sizeof(*locks);
+
if (dbuf.dsize) {
tdb_store(ttdb, kbuf, dbuf, TDB_REPLACE);
} else {
@@ -1325,7 +1356,7 @@
}
}
- for (i=0;i<dbuf.dsize/sizeof(*locks);i++) {
+ for ( i=0; i<num_locks; i++) {
traverse_callback(key->device,
key->inode,
locks[i].context.pid,
@@ -1334,6 +1365,8 @@
locks[i].start,
locks[i].size);
}
+
+ SAFE_FREE(locks);
return 0;
}
@@ -1429,47 +1462,12 @@
/* This is the first time we've accessed this. */
/* Go through and ensure all entries exist - remove any that don't. */
/* Makes the lockdb self cleaning at low cost. */
- unsigned int num_valid_entries = 0;
- unsigned int i;
- for (i = 0; i < br_lck->num_locks; i++) {
- struct lock_struct *lock_data = &((struct lock_struct *)br_lck->lock_data)[i];
- if (!process_exists(lock_data->context.pid)) {
- /* This process no longer exists - mark this
- entry as invalid by zeroing it. */
- ZERO_STRUCTP(lock_data);
- } else {
- num_valid_entries++;
- }
- }
-
- if (num_valid_entries != br_lck->num_locks) {
- struct lock_struct *new_lock_data = NULL;
-
- if (num_valid_entries) {
- new_lock_data = SMB_MALLOC_ARRAY(struct lock_struct, num_valid_entries);
- if (!new_lock_data) {
- DEBUG(3, ("malloc fail\n"));
- tdb_chainunlock(tdb, key);
- SAFE_FREE(br_lck->lock_data);
- SAFE_FREE(br_lck);
- return NULL;
- }
- num_valid_entries = 0;
- for (i = 0; i < br_lck->num_locks; i++) {
- struct lock_struct *lock_data = &((struct lock_struct *)br_lck->lock_data)[i];
- if (lock_data->context.smbpid &&
- lock_data->context.tid) {
- /* Valid (nonzero) entry - copy it. */
- memcpy(&new_lock_data[num_valid_entries],
- lock_data, sizeof(struct lock_struct));
- num_valid_entries++;
- }
- }
- }
+ if (!validate_lock_entries(&br_lck->num_locks, (struct lock_struct **)&br_lck->lock_data)) {
+ tdb_chainunlock(tdb, key);
SAFE_FREE(br_lck->lock_data);
- br_lck->lock_data = (void *)new_lock_data;
- br_lck->num_locks = num_valid_entries;
+ SAFE_FREE(br_lck);
+ return NULL;
}
/* Mark the lockdb as "clean" as seen from this open file. */
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