From d2f9946f029bd0e41352a90058393217575153b4 Mon Sep 17 00:00:00 2001
From: Gerald Carter <jerry@samba.org>
Date: Wed, 5 Feb 2003 15:56:10 +0000
Subject: [PATCH] apply smbumount lazy patch from Mandrake

---
 source/client/smbumount.c | 140 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 129 insertions(+), 11 deletions(-)

diff --git a/source/client/smbumount.c b/source/client/smbumount.c
index 20b6820fb76..2c2243528d6 100644
--- a/source/client/smbumount.c
+++ b/source/client/smbumount.c
@@ -15,6 +15,10 @@
 #include <linux/smb_mount.h>
 #include <linux/smb_fs.h>
 
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
 /* This is a (hopefully) temporary hack due to the fact that
 	sizeof( uid_t ) != sizeof( __kernel_uid_t ) under glibc.
 	This may change in the future and smb.h may get fixed in the
@@ -43,9 +47,9 @@ umount_ok(const char *mount_point)
         __kernel_uid_t mount_uid;
 	
         if (fid == -1) {
-                fprintf(stderr, "Could not open %s: %s\n",
-                        mount_point, strerror(errno));
-                return -1;
+                /* fprintf(stderr, "Could not open %s: %s\n",
+                        mount_point, strerror(errno)); */
+                return 1;	/* maybe try again */
         }
         
         if (ioctl(fid, SMB_IOC_GETMOUNTUID, &mount_uid) != 0) {
@@ -65,6 +69,92 @@ umount_ok(const char *mount_point)
         return 0;
 }
 
+#define	MAX_READLINKS	32
+/* myrealpath from mount, it could get REAL path under a broken connection */
+char *myrealpath(const char *path, char *resolved_path, int maxreslth)
+{
+	int readlinks = 0,m,n;
+	char *npath,*buf;
+	char link_path[PATH_MAX + 1];
+
+	npath = resolved_path;
+
+	if(*path != '/')
+	{
+		if(!getcwd(npath, maxreslth - 2))
+			return NULL;
+		npath += strlen(npath);
+		if(npath[-1] != '/')
+			*(npath++) = '/';
+		else
+		{
+			*npath++ = '/';
+			path++;
+		}
+	}
+
+	while(*path != '\0')
+	{
+		if(*path == '/')
+		{
+			path++;
+			continue;
+		}
+		if(*path == '.' && (path[1] == '\0' || path[1] == '/'))
+		{
+			path++;
+			continue;
+		}
+		if(*path == '.' && path[1] == '.' &&
+				(path[2] == '\0' || path[2] == '/'))
+		{
+			path += 2;
+			while(npath > resolved_path + 1 &&
+					(--npath)[-1] != '/');
+			continue;
+		}
+		while(*path != '\0' && *path != '/')
+		{
+			if(npath-resolved_path > maxreslth - 2)
+				return NULL;
+			*npath++ = *path++;
+		}
+		if(readlinks++ > MAX_READLINKS)
+			return NULL;
+		*npath = '\0';
+		n = readlink(resolved_path, link_path, PATH_MAX);
+		if(n < 0)
+		{
+			if(errno != EINVAL) return NULL;
+		}
+		else
+		{
+			link_path[n] = '\0';
+			if(*link_path == '/')
+				npath = resolved_path;
+			else while(*(--npath) != '/');
+			m = strlen(path);
+			if((buf = malloc(m + n + 1)) == NULL)
+			{
+				fprintf(stderr,"Not enough memory.\n");
+				return NULL;
+			}
+			memcpy(buf, link_path, n);
+			memcpy(buf + n, path, m + 1);
+			path = buf;
+		}
+		*npath++ = '/';
+	}
+	if(npath != resolved_path + 1)
+	{
+	    while(npath > resolved_path && npath[-1] == '/')
+		npath--;
+	    if(npath == resolved_path) return NULL;
+	}
+	*npath = '\0';
+	return resolved_path;
+}
+
 /* Make a canonical pathname from PATH.  Returns a freshly malloced string.
    It is up the *caller* to ensure that the PATH is sensible.  i.e.
    canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
@@ -73,7 +163,8 @@ umount_ok(const char *mount_point)
 static char *
 canonicalize (char *path)
 {
-	char *canonical = malloc (PATH_MAX + 1);
+	char *npath,*canonical = malloc (PATH_MAX + 1);
+	int i;
 
 	if (!canonical) {
 		fprintf(stderr, "Error! Not enough memory!\n");
@@ -87,11 +178,18 @@ canonicalize (char *path)
 
 	if (path == NULL)
 		return NULL;
-  
-	if (realpath (path, canonical))
+
+/*	if (realpath (path, canonical)) */
+	if(myrealpath(path, canonical, PATH_MAX))
 		return canonical;
 
 	pstrcpy (canonical, path);
+	if((i = strlen(canonical)) > 1 && i <= PATH_MAX)
+	{
+		path = canonical + i;
+		while(*(--path) == '/')
+			*path = '\0';
+	}
 	return canonical;
 }
 
@@ -122,14 +220,34 @@ main(int argc, char *argv[])
 		exit(1);
 	}
 
-        if (umount_ok(mount_point) != 0) {
-                exit(1);
+        if ((fd = umount_ok(mount_point)) != 0) {
+		if(fd == 1)
+		{
+			if((fd = umount_ok(mount_point)) != 0)
+			{
+				if(fd == 1)
+				{
+					fprintf(stderr, "Could not open %s: %s\n",
+						mount_point, strerror(errno));
+				}
+				exit(1);
+			}
+		}
+		else exit(1);
         }
 
+#if !defined(MNT_DETACH)
+ #define	MNT_DETACH	2
+#endif
+	
         if (umount(mount_point) != 0) {
-                fprintf(stderr, "Could not umount %s: %s\n",
-                        mount_point, strerror(errno));
-                exit(1);
+                /* fprintf(stderr, "Could not umount %s: %s\n,Trying lazy umount.\n",
+                        mount_point, strerror(errno)); */
+		if(umount2(mount_point,MNT_DETACH) != 0)
+		{
+			fprintf(stderr, "Lazy umount failed.\n");
+			return 1;
+		}
         }
 
         if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
-- 
2.11.4.GIT