From: ChenXiaoSong <chenxiaosong@kylinos.cn>
Date: Mon, 15 Jun 2026 11:29:07 +0000 (+0900)
Subject: smb/server: get compression file attribute on open
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e48b687221f4e5215c9b8d2ae2c319d88a65809c;p=thirdparty%2Flinux.git

smb/server: get compression file attribute on open

Example:

  1. server: chattr +c /export/file
  2. client: lsattr /mnt/file
             --------c------------- /mnt/file

Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index e3c53f22f5ec4..4b8e1a4f9e6bf 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -3604,7 +3604,10 @@ int smb2_open(struct ksmbd_work *work)
 
 	if (!created)
 		smb2_update_xattrs(tcon, &path, fp);
-	else
+
+	ksmbd_vfs_update_compressed_fattr(path.dentry, &fp->f_ci->m_fattr);
+
+	if (created)
 		smb2_new_xattrs(tcon, &path, fp);
 
 	memcpy(fp->client_guid, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index 18c0a7c6b41bd..b2403db135584 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -20,6 +20,7 @@
 #include <linux/sched/xacct.h>
 #include <linux/crc32c.h>
 #include <linux/splice.h>
+#include <linux/fileattr.h>
 
 #include "glob.h"
 #include "oplock.h"
@@ -1881,3 +1882,20 @@ int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
 	posix_acl_release(acls);
 	return rc;
 }
+
+void ksmbd_vfs_update_compressed_fattr(struct dentry *dentry, __le32 *fattr)
+{
+	int rc;
+	struct file_kattr fa = { .flags_valid = true };
+
+	rc = vfs_fileattr_get(dentry, &fa);
+	if (rc == -ENOIOCTLCMD)
+		*fattr &= ~FILE_ATTRIBUTE_COMPRESSED_LE;
+	if (rc)
+		return;
+
+	if (fa.flags & FS_COMPR_FL)
+		*fattr |= FILE_ATTRIBUTE_COMPRESSED_LE;
+	else
+		*fattr &= ~FILE_ATTRIBUTE_COMPRESSED_LE;
+}
diff --git a/fs/smb/server/vfs.h b/fs/smb/server/vfs.h
index 16ca29ee16e51..ac6dda173b752 100644
--- a/fs/smb/server/vfs.h
+++ b/fs/smb/server/vfs.h
@@ -168,4 +168,5 @@ int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
 				const struct path *path,
 				struct inode *parent_inode);
+void ksmbd_vfs_update_compressed_fattr(struct dentry *dentry, __le32 *fattr);
 #endif /* __KSMBD_VFS_H__ */