[CIFS] Recognize properly symlinks and char/blk devices (not just

FIFOs) created by SFU (part 2 of 2).

    Thanks to Martin Koeppe for useful analysis.

    Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 44 insertions, 4 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index ba9eae56d011..93dd705577bc 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -228,9 +228,20 @@ static int decode_sfu_inode(struct inode * inode, __u64 size,
                                  8 /* length */, 0 /* offset */,
                                  &bytes_read, &pbuf);
                 if((rc == 0) && (bytes_read == 8)) {
-                        /* if memcmp(IntxCHR\000, pbuf, 8)
-                           else if memcmp(IntxBLK\000, pbuf, 8)
-                           else if memcmp(IntxLNK\001, pbuf, 8) */
+                        cERROR(1,("intx %s" ,pbuf));
+                        if(memcmp("IntxBLK", pbuf, 8) == 0) {
+                                cFYI(1,("Block device"));
+                                inode->i_mode = S_IFBLK;
+                        } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
+                                cFYI(1,("Char device"));
+                                inode->i_mode = S_IFCHR;
+                        } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
+                                cFYI(1,("Symlink"));
+                                inode->i_mode = S_IFLNK;
+                        } else
+                                inode->i_mode = S_IFREG; /* then it is a file */
+                                rc = -EOPNOTSUPP; /* or some unknown SFU type */ 
+                         
                 }
                 
                 CIFSSMBClose(xid, pTcon, netfid);
@@ -244,6 +255,32 @@ static int decode_sfu_inode(struct inode * inode, __u64 size,
         
 }
 
+#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
+
+static int get_sfu_uid_mode(struct inode * inode,
+                        const unsigned char *path,
+                        struct cifs_sb_info *cifs_sb, int xid)
+{
+        ssize_t rc;
+        char ea_value[4];
+        __u32 mode;
+
+        rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
+                        ea_value, 4 /* size of buf */, cifs_sb->local_nls,
+                        cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+        if(rc < 0)
+                return (int)rc;
+        else if (rc > 3) {
+                mode = le32_to_cpu(*((__le32 *)ea_value));
+                inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
+                cFYI(1,("special mode bits 0%o", mode));
+                return 0;
+        } else {
+                return 0;
+        }
+                
+}
+
 int cifs_get_inode_info(struct inode **pinode,
         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
         struct super_block *sb, int xid)
@@ -427,7 +464,10 @@ int cifs_get_inode_info(struct inode **pinode,
 
                 /* BB fill in uid and gid here? with help from winbind? 
                    or retrieve from NTFS stream extended attribute */
-                if (atomic_read(&cifsInfo->inUse) == 0) {
+                if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
+                        /* fill in uid, gid, mode from server ACL */
+                        get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
+                } else if (atomic_read(&cifsInfo->inUse) == 0) {
                         inode->i_uid = cifs_sb->mnt_uid;
                         inode->i_gid = cifs_sb->mnt_gid;
                         /* set so we do not keep refreshing these fields with