[PATCH 11/13] smb: introduce struct create_posix_ctxt_rsp

chenxiaosong.chenxiaosong
2025-12-09T01:12:14Z

From: ZhangGuoDong <zhangguodong@kylinos.cn>

Modify the following places:

- introduce new struct create_posix_ctxt_rsp
- some fields in "struct create_posix_rsp" -> "struct create_posix_ctxt_rsp"
- create_posix_rsp_buf(): offsetof(..., nlink) -> offsetof(..., ctxt_rsp)

Co-developed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: ZhangGuoDong <zhangguodong@kylinos.cn>
---
fs/smb/client/smb2pdu.c | 9 +++++----
fs/smb/client/smb2pdu.h | 6 ++----
fs/smb/common/smb2pdu.h | 18 ++++++++++++++++++
fs/smb/server/oplock.c | 8 ++++----
fs/smb/server/smb2pdu.h | 6 ++----
5 files changed, 31 insertions(+), 16 deletions(-)

diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index ef2c6ac500f7..ec0f83db5591 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -2298,9 +2298,9 @@ parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,

memset(posix, 0, sizeof(*posix));

- posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
- posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
- posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
+ posix->ctxt_rsp.nlink = le32_to_cpu(*(__le32 *)(beg + 0));
+ posix->ctxt_rsp.reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
+ posix->ctxt_rsp.mode = le32_to_cpu(*(__le32 *)(beg + 8));

sid = beg + 12;
sid_len = posix_info_sid_size(sid, end);
@@ -2319,7 +2319,8 @@ parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
memcpy(&posix->group, sid, sid_len);

cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
- posix->nlink, posix->mode, posix->reparse_tag);
+ posix->ctxt_rsp.nlink, posix->ctxt_rsp.mode,
+ posix->ctxt_rsp.reparse_tag);
}

int smb2_parse_contexts(struct TCP_Server_Info *server,
diff --git a/fs/smb/client/smb2pdu.h b/fs/smb/client/smb2pdu.h
index 78bb99f29d38..4928fb620233 100644
--- a/fs/smb/client/smb2pdu.h
+++ b/fs/smb/client/smb2pdu.h
@@ -251,11 +251,9 @@ struct smb2_file_id_extd_directory_info {

extern char smb2_padding[7];

-/* equivalent of the contents of SMB3.1.1 POSIX open context response */
+/* See POSIX-SMB2 2.2.14.2.16 */
struct create_posix_rsp {
- u32 nlink;
- u32 reparse_tag;
- u32 mode;
+ struct create_posix_ctxt_rsp ctxt_rsp;
struct smb_sid owner; /* var-sized on the wire */
struct smb_sid group; /* var-sized on the wire */
} __packed;
diff --git a/fs/smb/common/smb2pdu.h b/fs/smb/common/smb2pdu.h
index 72f2cfc47da8..698ab9d7d16b 100644
--- a/fs/smb/common/smb2pdu.h
+++ b/fs/smb/common/smb2pdu.h
@@ -1814,4 +1814,22 @@ typedef struct smb_negotiate_req {
unsigned char DialectsArray[];
} __packed SMB_NEGOTIATE_REQ;

+
+/*
+ * [POSIX-SMB2] SMB3 POSIX Extensions
+ * Link: https://gitlab.com/samba-team/smb3-posix-spec/-/blob/master/smb3_posix_extensions.md
+ */
+
+/*
+ * SMB2_CREATE_POSIX_CONTEXT Response
+ * See POSIX-SMB2 2.2.14.2.16
+ */
+struct create_posix_ctxt_rsp {
+ __le32 nlink;
+ __le32 reparse_tag;
+ __le32 mode;
+ // var sized owner SID
+ // var sized group SID
+} __packed;
+
#endif /* _COMMON_SMB2PDU_H */
diff --git a/fs/smb/server/oplock.c b/fs/smb/server/oplock.c
index 1f07ebf431d7..8658402ff893 100644
--- a/fs/smb/server/oplock.c
+++ b/fs/smb/server/oplock.c
@@ -1703,7 +1703,7 @@ void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp)
buf = (struct create_posix_rsp *)cc;
memset(buf, 0, sizeof(struct create_posix_rsp));
buf->ccontext.DataOffset = cpu_to_le16(offsetof
- (struct create_posix_rsp, nlink));
+ (struct create_posix_rsp, ctxt_rsp));
/*
* DataLength = nlink(4) + reparse_tag(4) + mode(4) +
* domain sid(28) + unix group sid(16).
@@ -1730,9 +1730,9 @@ void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp)
buf->Name[14] = 0xCD;
buf->Name[15] = 0x7C;

- buf->nlink = cpu_to_le32(inode->i_nlink);
- buf->reparse_tag = cpu_to_le32(fp->volatile_id);
- buf->mode = cpu_to_le32(inode->i_mode & 0777);
+ buf->ctxt_rsp.nlink = cpu_to_le32(inode->i_nlink);
+ buf->ctxt_rsp.reparse_tag = cpu_to_le32(fp->volatile_id);
+ buf->ctxt_rsp.mode = cpu_to_le32(inode->i_mode & 0777);
/*
* SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)).
* Domain sid(28) = revision(1) + num_subauth(1) + authority(6) +
diff --git a/fs/smb/server/smb2pdu.h b/fs/smb/server/smb2pdu.h
index 66cdc8e4a648..09311a9eb1de 100644
--- a/fs/smb/server/smb2pdu.h
+++ b/fs/smb/server/smb2pdu.h
@@ -83,13 +83,11 @@ struct create_durable_rsp {
} Data;
} __packed;

-/* equivalent of the contents of SMB3.1.1 POSIX open context response */
+/* See POSIX-SMB2 2.2.14.2.16 */
struct create_posix_rsp {
struct create_context_hdr ccontext;
__u8 Name[16];
- __le32 nlink;
- __le32 reparse_tag;
- __le32 mode;
+ struct create_posix_ctxt_rsp ctxt_rsp;
/* SidBuffer contain two sids(Domain sid(28), UNIX group sid(16)) */
u8 SidBuffer[44];
} __packed;
--
2.43.0