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-rw-r--r--source3/locking/locking.c166
1 files changed, 157 insertions, 9 deletions
diff --git a/source3/locking/locking.c b/source3/locking/locking.c
index 1bb0a3b59c..72ca91566a 100644
--- a/source3/locking/locking.c
+++ b/source3/locking/locking.c
@@ -40,27 +40,134 @@ static TDB_CONTEXT *tdb;
int global_smbpid;
-
/****************************************************************************
-remove any locks on this fd
+ Remove any locks on this fd.
****************************************************************************/
+
void locking_close_file(files_struct *fsp)
{
- if (!lp_locking(SNUM(fsp->conn))) return;
+ if (!lp_locking(SNUM(fsp->conn)))
+ return;
+
+ if(lp_posix_locking(SNUM(fsp->conn))) {
+ /*
+ * We need to release all POSIX locks we have on this
+ * fd.
+ */
+ }
+
+ /*
+ * Now release all the tdb locks.
+ */
+
+ brl_close(fsp->dev, fsp->inode, getpid(), fsp->conn->cnum, fsp->fnum);
+
+ /*
+ * We now need to search our open file list for any other
+ * fd open on this file with outstanding POSIX locks. If we
+ * don't find one, great, just return. If we do find one then
+ * we have to add this file descriptor to the 'pending close'
+ * list of that fd, to stop the POSIX problem where the locks
+ * on *that* fd will get lost when we close this one. POSIX
+ * braindamage... JRA.
+ */
+
+ /* Placeholder for code here.... */
+}
+
+/****************************************************************************
+ Debugging aid :-).
+****************************************************************************/
+
+static const char *lock_type_name(enum brl_type lock_type)
+{
+ return (lock_type == READ_LOCK) ? "READ" : "WRITE";
+}
+
+/****************************************************************************
+ Check to see if the given unsigned lock range is within the possible POSIX
+ range. Modifies the given args to be in range if possible, just returns
+ False if not.
+****************************************************************************/
- brl_close(fsp->dev, fsp->inode,
- getpid(), fsp->conn->cnum, fsp->fnum);
+static BOOL posix_lock_in_range(SMB_OFF_T *p_offset, SMB_OFF_T *p_count)
+{
+ /* Placeholder. */
+ return True;
}
+/****************************************************************************
+ POSIX function to see if a file region is locked. Returns True if the
+ lock could be granted, False if not.
+****************************************************************************/
+
+static BOOL posix_locktest(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG_UINT u_count, enum brl_type lock_type)
+{
+ SMB_OFF_T offset = (SMB_OFF_T)u_offset;
+ SMB_OFF_T count = (SMB_OFF_T)u_count;
+
+ DEBUG(10,("posix_locktest: File %s, offset = %.0f, count = %.0f, type = %s\n",
+ fsp->fsp_name, (double)offset, (double)count, lock_type_name(lock_type) ));
+
+ if(!posix_lock_in_range(&offset, &count))
+ return True;
+
+ /* Placeholder - for now always return that the lock could be granted. */
+ return True;
+}
+
+/****************************************************************************
+ POSIX function to acquire a lock. Returns True if the
+ lock could be granted, False if not.
+****************************************************************************/
+
+static BOOL get_posix_lock(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG_UINT u_count, enum brl_type lock_type)
+{
+ SMB_OFF_T offset = (SMB_OFF_T)u_offset;
+ SMB_OFF_T count = (SMB_OFF_T)u_count;
+
+ DEBUG(10,("get_posix_lock: File %s, offset = %.0f, count = %.0f, type = %s\n",
+ fsp->fsp_name, (double)offset, (double)count, lock_type_name(lock_type) ));
+
+ if(!posix_lock_in_range(&offset, &count))
+ return True;
+
+ /* Placeholder - for now always return that the lock could be granted. */
+ fsp->num_posix_locks++;
+ return True;
+}
+
+/****************************************************************************
+ POSIX function to release a lock. Returns True if the
+ lock could be granted, False if not.
+****************************************************************************/
+
+static BOOL release_posix_lock(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG_UINT u_count)
+{
+ SMB_OFF_T offset = (SMB_OFF_T)u_offset;
+ SMB_OFF_T count = (SMB_OFF_T)u_count;
+
+ DEBUG(10,("release_posix_lock: File %s, offset = %.0f, count = %.0f\n",
+ fsp->fsp_name, (double)offset, (double)count ));
+
+ if(!posix_lock_in_range(&offset, &count))
+ return True;
+
+ /* Placeholder - for now always return that the lock could be granted. */
+ fsp->num_posix_locks--;
+ return True;
+}
/****************************************************************************
Utility function called to see if a file region is locked.
****************************************************************************/
+
BOOL is_locked(files_struct *fsp,connection_struct *conn,
SMB_BIG_UINT count,SMB_BIG_UINT offset,
enum brl_type lock_type)
{
int snum = SNUM(conn);
+ BOOL ret;
if (count == 0)
return(False);
@@ -68,15 +175,28 @@ BOOL is_locked(files_struct *fsp,connection_struct *conn,
if (!lp_locking(snum) || !lp_strict_locking(snum))
return(False);
- return !brl_locktest(fsp->dev, fsp->inode,
+ ret = !brl_locktest(fsp->dev, fsp->inode,
global_smbpid, getpid(), conn->cnum,
offset, count, lock_type);
-}
+ /*
+ * There is no lock held by an SMB daemon, check to
+ * see if there is a POSIX lock from a UNIX or NFS process.
+ * Note that as an optimisation we only bother to
+ * check this if the file is not exclusively
+ * oplocked. JRA.
+ */
+
+ if(!ret && !EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && lp_posix_locking(snum))
+ ret = !posix_locktest(fsp, offset, count, lock_type);
+
+ return ret;
+}
/****************************************************************************
Utility function called by locking requests.
****************************************************************************/
+
BOOL do_lock(files_struct *fsp,connection_struct *conn,
SMB_BIG_UINT count,SMB_BIG_UINT offset,enum brl_type lock_type,
int *eclass,uint32 *ecode)
@@ -92,14 +212,33 @@ BOOL do_lock(files_struct *fsp,connection_struct *conn,
return False;
}
- DEBUG(10,("do_lock: lock type %d start=%.0f len=%.0f requested for file %s\n",
- lock_type, (double)offset, (double)count, fsp->fsp_name ));
+ DEBUG(10,("do_lock: lock type %s start=%.0f len=%.0f requested for file %s\n",
+ lock_type_name(lock_type), (double)offset, (double)count, fsp->fsp_name ));
if (OPEN_FSP(fsp) && fsp->can_lock && (fsp->conn == conn)) {
ok = brl_lock(fsp->dev, fsp->inode, fsp->fnum,
global_smbpid, getpid(), conn->cnum,
offset, count,
lock_type);
+
+ if(ok && lp_posix_locking(SNUM(conn))) {
+
+ /*
+ * Try and get a POSIX lock on this range.
+ */
+
+ ok = get_posix_lock(fsp, offset, count, lock_type);
+
+ if(!ok) {
+ /*
+ * We failed to map - we must now remove the brl
+ * lock entry.
+ */
+ (void)brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
+ global_smbpid, getpid(), conn->cnum,
+ offset, count);
+ }
+ }
}
if (!ok) {
@@ -130,6 +269,15 @@ BOOL do_unlock(files_struct *fsp,connection_struct *conn,
ok = brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
global_smbpid, getpid(), conn->cnum,
offset, count);
+
+ if(ok && lp_posix_locking(SNUM(conn))) {
+
+ /*
+ * Release the POSIX lock on this range.
+ */
+
+ (void)release_posix_lock(fsp, offset, count);
+ }
}
if (!ok) {
generated by cgit (git 2.34.1) at 2024-11-09 10:31:22 +0000