[PATCH] ksmbd: support FileIdAllExtdDirectoryInformation

[Namjae Jeon <linkinjeon@kernel.org>]

Handle FileIdAllExtdDirectoryInformation (0x50) in SMB2 QUERY_DIRECTORY.
Add the packed wire layout specified by MS-FSCC 2.4.21 and support
this class in entry reservation, filename lookup and response encoding.

Use the VFS inode number for the 64-bit file ID and retain the existing
Apple extension behavior of returning a zero ID. Zero the 128-bit file
ID because the VFS provides only a 64-bit inode number, as permitted by
the specification. Report reparse tags separately from the EA size, set
the reparse flag without changing other file attributes, and initialize
entry padding.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/smb/server/smb2pdu.c    | 48 ++++++++++++++++++++++++++++++++++++++
 fs/smb/server/smb_common.h | 19 +++++++++++++++
 2 files changed, 67 insertions(+)

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 2c0378d306a8..32fd06171cdd 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -5450,6 +5450,8 @@ static int readdir_info_level_struct_sz(int info_level)
 		return sizeof(struct file_id_64_extd_directory_info);
 	case FileId64ExtdBothDirectoryInformation:
 		return sizeof(struct file_id_64_extd_both_directory_info);
+	case FileIdAllExtdDirectoryInformation:
+		return sizeof(struct file_id_all_extd_directory_info);
 	case FileIdAllExtdBothDirectoryInformation:
 		return sizeof(struct file_id_all_extd_both_directory_info);
 	case SMB_FIND_FILE_POSIX_INFO:
@@ -5552,6 +5554,16 @@ static int dentry_name(struct ksmbd_dir_info *d_info, int info_level)
 		d_info->name_len = le32_to_cpu(info->FileNameLength);
 		return 0;
 	}
+	case FileIdAllExtdDirectoryInformation:
+	{
+		struct file_id_all_extd_directory_info *info;
+
+		info = (struct file_id_all_extd_directory_info *)d_info->rptr;
+		d_info->rptr += le32_to_cpu(info->NextEntryOffset);
+		d_info->name = info->FileName;
+		d_info->name_len = le32_to_cpu(info->FileNameLength);
+		return 0;
+	}
 	case FileIdAllExtdBothDirectoryInformation:
 	{
 		struct file_id_all_extd_both_directory_info *info;
@@ -5866,6 +5878,30 @@ static int smb2_populate_readdir_entry(struct ksmbd_conn *conn, int info_level,
 		info->NextEntryOffset = cpu_to_le32(next_entry_offset);
 		break;
 	}
+	case FileIdAllExtdDirectoryInformation:
+	{
+		struct file_id_all_extd_directory_info *info;
+
+		info = (struct file_id_all_extd_directory_info *)kstat;
+		info->FileNameLength = cpu_to_le32(conv_len);
+		info->EaSize = 0;
+		info->ReparsePointTag =
+			smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
+		if (info->ReparsePointTag)
+			info->ExtFileAttributes |= FILE_ATTRIBUTE_REPARSE_POINT_LE;
+		if (conn->is_aapl)
+			info->FileId = 0;
+		else
+			info->FileId = cpu_to_le64(ksmbd_kstat->kstat->ino);
+		/* The VFS does not provide a 128-bit file ID. */
+		memset(info->FileId128, 0, sizeof(info->FileId128));
+		if (d_info->hide_dot_file && d_info->name[0] == '.')
+			info->ExtFileAttributes |= FILE_ATTRIBUTE_HIDDEN_LE;
+		memcpy(info->FileName, conv_name, conv_len);
+		memset(info->FileName + conv_len, 0, d_info->last_entry_off_align);
+		info->NextEntryOffset = cpu_to_le32(next_entry_offset);
+		break;
+	}
 	case FileIdAllExtdBothDirectoryInformation:
 	{
 		struct file_id_all_extd_both_directory_info *info;
@@ -6172,6 +6208,17 @@ static int reserve_populate_dentry(struct ksmbd_dir_info *d_info,
 		info->NextEntryOffset = cpu_to_le32(next_entry_offset);
 		break;
 	}
+	case FileIdAllExtdDirectoryInformation:
+	{
+		struct file_id_all_extd_directory_info *info;
+
+		info = (struct file_id_all_extd_directory_info *)d_info->wptr;
+		memcpy(info->FileName, d_info->name, d_info->name_len);
+		info->FileName[d_info->name_len] = 0x00;
+		info->FileNameLength = cpu_to_le32(d_info->name_len);
+		info->NextEntryOffset = cpu_to_le32(next_entry_offset);
+		break;
+	}
 	case FileIdAllExtdBothDirectoryInformation:
 	{
 		struct file_id_all_extd_both_directory_info *info;
@@ -6247,6 +6294,7 @@ static int verify_info_level(int info_level)
 	case FILE_ID_EXTD_DIRECTORY_INFORMATION:
 	case FileId64ExtdDirectoryInformation:
 	case FileId64ExtdBothDirectoryInformation:
+	case FileIdAllExtdDirectoryInformation:
 	case FileIdAllExtdBothDirectoryInformation:
 		break;
 	default:
diff --git a/fs/smb/server/smb_common.h b/fs/smb/server/smb_common.h
index 571b0e9e35d2..a9cc09e31721 100644
--- a/fs/smb/server/smb_common.h
+++ b/fs/smb/server/smb_common.h
@@ -190,6 +190,25 @@ struct file_id_64_extd_both_directory_info {
 	char FileName[];
 } __packed;
 
+/* MS-FSCC 2.4.21 FileIdAllExtdDirectoryInformation */
+struct file_id_all_extd_directory_info {
+	__le32 NextEntryOffset;
+	__u32 FileIndex;
+	__le64 CreationTime;
+	__le64 LastAccessTime;
+	__le64 LastWriteTime;
+	__le64 ChangeTime;
+	__le64 EndOfFile;
+	__le64 AllocationSize;
+	__le32 ExtFileAttributes;
+	__le32 FileNameLength;
+	__le32 EaSize;
+	__le32 ReparsePointTag;
+	__le64 FileId;
+	__u8 FileId128[16];
+	char FileName[];
+} __packed;
+
 /* MS-FSCC 2.4.20 FileIdAllExtdBothDirectoryInformation */
 struct file_id_all_extd_both_directory_info {
 	__le32 NextEntryOffset;
-- 
2.25.1