linux-kernel - [PATCH v2 4/6] fs/ntfs3: Pass flags to ntfs_set_ea in ntfs_set_acl

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Date:   Thu, 23 Sep 2021 18:43:59 +0300
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     <ntfs3@...ts.linux.dev>
CC:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
Subject: [PATCH v2 4/6] fs/ntfs3: Pass flags to ntfs_set_ea in ntfs_set_acl_ex

In case of removing of xattr there must be XATTR_REPLACE flag and
zero length. We already check XATTR_REPLACE in ntfs_set_ea, so
now we pass XATTR_REPLACE to ntfs_set_ea.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
 fs/ntfs3/xattr.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 3795943efc8e..70f2f9eb6b1e 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -549,6 +549,7 @@ static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
 	size_t size, name_len;
 	void *value = NULL;
 	int err = 0;
+	int flags;
 
 	if (S_ISLNK(inode->i_mode))
 		return -EOPNOTSUPP;
@@ -591,20 +592,24 @@ static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
 	}
 
 	if (!acl) {
+		/* Remove xattr if it can be presented via mode. */
 		size = 0;
 		value = NULL;
+		flags = XATTR_REPLACE;
 	} else {
 		size = posix_acl_xattr_size(acl->a_count);
 		value = kmalloc(size, GFP_NOFS);
 		if (!value)
 			return -ENOMEM;
-
 		err = posix_acl_to_xattr(mnt_userns, acl, value, size);
 		if (err < 0)
 			goto out;
+		flags = 0;
 	}
 
-	err = ntfs_set_ea(inode, name, name_len, value, size, 0, locked);
+	err = ntfs_set_ea(inode, name, name_len, value, size, flags, locked);
+	if (err == -ENODATA && !size)
+		err = 0; /* Removing non existed xattr. */
 	if (!err)
 		set_cached_acl(inode, type, acl);
 
-- 
2.33.0