From: Pali Rohár <pali@kernel.org>
Date: Thu, 12 Sep 2024 12:05:46 +0000 (+0200)
Subject: cifs: Recognize SFU socket type
X-Git-Tag: v6.12-rc1~139^2~4
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=2ba0d8947efd49d44babe7a2e72637c630fcfc42;p=linux-block.git

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 70c32b40ede0..331a86074ae7 100644
--- 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;