[PATCH] cifs: CIFS ioctl needed by umount.cifs utility

Signed-off-by: Steve French (sfrench@us.ibm.com)
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 28 insertions, 9 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 3d5365b9f5ba..461a706b237b 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -190,6 +190,7 @@ cifs_statfs(struct super_block *sb, struct kstatfs *buf)
 
 #ifdef CONFIG_CIFS_EXPERIMENTAL
 /* BB we could add a second check for a QFS Unix capability bit */
+/* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
     if (pTcon->ses->capabilities & CAP_UNIX)
             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 
@@ -599,6 +600,9 @@ struct file_operations cifs_dir_ops = {
 #ifdef CONFIG_CIFS_EXPERIMENTAL
         .dir_notify = cifs_dir_notify,
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
+#ifdef CONFIG_CIFS_POSIX
+        .ioctl  = cifs_ioctl,
+#endif /* CONFIG_CIFS_POSIX */
 };
 
 static void
diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
index 5b352890f092..e3e92615705e 100644
--- a/fs/cifs/cifspdu.h
+++ b/fs/cifs/cifspdu.h
@@ -1556,7 +1556,7 @@ typedef struct {
 #define CIFS_UNIX_POSIX_ACL_CAP         0x00000002 /* support getfacl/setfacl */
 #define CIFS_UNIX_XATTR_CAP             0x00000004 /* support new namespace   */
 #define CIFS_UNIX_EXTATTR_CAP           0x00000008 /* support chattr/chflag   */
-
+#define CIFS_POSIX_EXTENSIONS           0x00000010 /* support for new QFSInfo */
 typedef struct {
         /* For undefined recommended transfer size return -1 in that field */
         __le32 OptimalTransferSize;  /* bsize on some os, iosize on other os */
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index a4f1c34a8dc7..711bb7a3a98e 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -29,6 +29,8 @@
 #include "cifs_debug.h"
 #include "cifsfs.h"
 
+#define CIFS_IOC_CHECKUMOUNT _IO(0xCF, 2)
+
 int cifs_ioctl (struct inode * inode, struct file * filep, 
                 unsigned int command, unsigned long arg)
 {
@@ -36,8 +38,8 @@ int cifs_ioctl (struct inode * inode, struct file * filep,
 #ifdef CONFIG_CIFS_POSIX
         __u64   ExtAttrBits = 0;
         __u64   ExtAttrMask = 0;
-        __u64   caps;
 #endif /* CONFIG_CIFS_POSIX */
+        __u64   caps;
         int xid;
         struct cifs_sb_info *cifs_sb;
         struct cifsTconInfo *tcon;
@@ -46,12 +48,11 @@ int cifs_ioctl (struct inode * inode, struct file * filep,
 
         xid = GetXid();
 
+        cFYI(1,("ioctl file %p  cmd %u  arg %lu",filep,command,arg));
+
         cifs_sb = CIFS_SB(inode->i_sb);
         tcon = cifs_sb->tcon;
-        if (pSMBFile == NULL)
-                goto cifs_ioctl_out;
 
-#ifdef CONFIG_CIFS_POSIX
         if(tcon)
                 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
         else {
@@ -59,10 +60,22 @@ int cifs_ioctl (struct inode * inode, struct file * filep,
                 goto cifs_ioctl_out;
         }
 
-        cFYI(1,("ioctl file %p  cmd %u  arg %lu",filep,command,arg));
         switch(command) {
+                case CIFS_IOC_CHECKUMOUNT:
+                        cFYI(1,("User unmount attempted"));
+                        /* BB FIXME - add missing code here FIXME */
+                        if(cifs_sb->mnt_uid == current->uid)
+                                rc = 0;
+                        else {
+                                rc = -EACCES;
+                                cFYI(1,("uids do not match"));
+                        }
+                        break;
+#ifdef CONFIG_CIFS_POSIX
                 case EXT2_IOC_GETFLAGS:
                         if(CIFS_UNIX_EXTATTR_CAP & caps) {
+                                if (pSMBFile == NULL)
+                                        goto cifs_ioctl_out;
                                 rc = CIFSGetExtAttr(xid, tcon, pSMBFile->netfid,
                                         &ExtAttrBits, &ExtAttrMask);
                                 if(rc == 0)
@@ -78,17 +91,19 @@ int cifs_ioctl (struct inode * inode, struct file * filep,
                                         rc = -EFAULT;
                                         goto cifs_ioctl_out;
                                 }
-                          /* rc = CIFSGetExtAttr(xid, tcon, pSMBFile->netfid,
+                                if (pSMBFile == NULL)
+                                        goto cifs_ioctl_out;
+                                /* rc= CIFSGetExtAttr(xid,tcon,pSMBFile->netfid,
                                         extAttrBits, &ExtAttrMask);*/
                                 
                         }
                         cFYI(1,("set flags not implemented yet"));
                         break;
+#endif /* CONFIG_CIFS_POSIX */
                 default:
                         cFYI(1,("unsupported ioctl"));
-                        return rc;
+                        break;
         }
-#endif /* CONFIG_CIFS_POSIX */
 
 cifs_ioctl_out:
         FreeXid(xid);