linux-kernel - [PATCH 4/4] cifs: Improve handling of name surrogate reparse points in reparse.c

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Message-Id: <20241222145845.23801-5-pali@kernel.org>
Date: Sun, 22 Dec 2024 15:58:45 +0100
From: Pali Rohár <pali@...nel.org>
To: Steve French <sfrench@...ba.org>,
	Paulo Alcantara <pc@...guebit.com>,
	Ronnie Sahlberg <ronniesahlberg@...il.com>
Cc: linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] cifs: Improve handling of name surrogate reparse points in reparse.c

Like previous changes for file inode.c, handle directory name surrogate
reparse points generally also in reparse.c.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 fs/smb/client/reparse.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
index 63a95ecc7542..6ffda4455f9b 100644
--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -1222,16 +1222,6 @@ bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
 	bool ok;
 
 	switch (tag) {
-	case IO_REPARSE_TAG_INTERNAL:
-		if (!(fattr->cf_cifsattrs & ATTR_DIRECTORY))
-			return false;
-		fallthrough;
-	case IO_REPARSE_TAG_DFS:
-	case IO_REPARSE_TAG_DFSR:
-	case IO_REPARSE_TAG_MOUNT_POINT:
-		/* See cifs_create_junction_fattr() */
-		fattr->cf_mode = S_IFDIR | 0711;
-		break;
 	case IO_REPARSE_TAG_LX_SYMLINK:
 	case IO_REPARSE_TAG_LX_FIFO:
 	case IO_REPARSE_TAG_AF_UNIX:
@@ -1249,7 +1239,14 @@ bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
 		fattr->cf_mode |= S_IFLNK;
 		break;
 	default:
-		return false;
+		if (!(fattr->cf_cifsattrs & ATTR_DIRECTORY))
+			return false;
+		if (!IS_REPARSE_TAG_NAME_SURROGATE(tag) &&
+		    tag != IO_REPARSE_TAG_INTERNAL)
+			return false;
+		/* See cifs_create_junction_fattr() */
+		fattr->cf_mode = S_IFDIR | 0711;
+		break;
 	}
 
 	fattr->cf_dtype = S_DT(fattr->cf_mode);
-- 
2.20.1