cifs: Recognize SFU socket type

SFU since its (first) version 3.0 supports AF_LOCAL sockets and stores them
on filesytem as system file with one zero byte. Add support for detecting
this SFU socket type into cifs_sfu_type() function.

With this change cifs_sfu_type() would correctly detect all special file
types created by SFU: fifo, socket, symlink, block and char.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c
index 70c32b40ede007038a9042a57d9601aefdf4efdf..331a86074ae78ca12c69fcc6448e10e48089ad5a 100644 (file)
--- a/fs/smb/client/inode.c
+++ b/fs/smb/client/inode.c
@@ -545,7 +545,7 @@ cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
                fattr->cf_mode |= S_IFIFO;
                fattr->cf_dtype = DT_FIFO;
                return 0;
-       } else if (fattr->cf_eof < 8) {
+       } else if (fattr->cf_eof > 1 && fattr->cf_eof < 8) {
                fattr->cf_mode |= S_IFREG;
                fattr->cf_dtype = DT_REG;
                return -EINVAL;  /* EOPNOTSUPP? */
@@ -655,6 +655,10 @@ cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
                        fattr->cf_dtype = DT_REG;
                        rc = -EOPNOTSUPP;
                }
+       } else if ((rc == 0) && (bytes_read == 1) && (pbuf[0] == '\0')) {
+               cifs_dbg(FYI, "Socket\n");
+               fattr->cf_mode |= S_IFSOCK;
+               fattr->cf_dtype = DT_SOCK;
        } else {
                fattr->cf_mode |= S_IFREG; /* then it is a file */
                fattr->cf_dtype = DT_REG;