cifs: Use smb 2 - 3 and cifsacl mount options getacl functions

Fill in smb2/3 query acl functions in ops structures and use them.

Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 116 insertions, 0 deletions

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 88fda3f5d105..f1d9c191c4e4 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1288,6 +1288,107 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
         return rc;
 }
 
+static struct cifs_ntsd *
+get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
+                const struct cifs_fid *cifsfid, u32 *pacllen)
+{
+        struct cifs_ntsd *pntsd = NULL;
+        unsigned int xid;
+        int rc = -EOPNOTSUPP;
+        struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+
+        if (IS_ERR(tlink))
+                return ERR_CAST(tlink);
+
+        xid = get_xid();
+        cifs_dbg(FYI, "trying to get acl\n");
+
+        rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
+                            cifsfid->volatile_fid, (void **)&pntsd, pacllen);
+        free_xid(xid);
+
+        cifs_put_tlink(tlink);
+
+        cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
+        if (rc)
+                return ERR_PTR(rc);
+        return pntsd;
+
+}
+
+static struct cifs_ntsd *
+get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
+                const char *path, u32 *pacllen)
+{
+        struct cifs_ntsd *pntsd = NULL;
+        u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+        unsigned int xid;
+        int rc;
+        struct cifs_tcon *tcon;
+        struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+        struct cifs_fid fid;
+        struct cifs_open_parms oparms;
+        __le16 *utf16_path;
+
+        cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
+        if (IS_ERR(tlink))
+                return ERR_CAST(tlink);
+
+        tcon = tlink_tcon(tlink);
+        xid = get_xid();
+
+        if (backup_cred(cifs_sb))
+                oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
+        else
+                oparms.create_options = 0;
+
+        utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+        if (!utf16_path)
+                return ERR_PTR(-ENOMEM);
+
+        oparms.tcon = tcon;
+        oparms.desired_access = READ_CONTROL;
+        oparms.disposition = FILE_OPEN;
+        oparms.fid = &fid;
+        oparms.reconnect = false;
+
+        rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+        kfree(utf16_path);
+        if (!rc) {
+                rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
+                            fid.volatile_fid, (void **)&pntsd, pacllen);
+                SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+        }
+
+        cifs_put_tlink(tlink);
+        free_xid(xid);
+
+        cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
+        if (rc)
+                return ERR_PTR(rc);
+        return pntsd;
+}
+
+/* Retrieve an ACL from the server */
+static struct cifs_ntsd *
+get_smb2_acl(struct cifs_sb_info *cifs_sb,
+                                      struct inode *inode, const char *path,
+                                      u32 *pacllen)
+{
+        struct cifs_ntsd *pntsd = NULL;
+        struct cifsFileInfo *open_file = NULL;
+
+        if (inode)
+                open_file = find_readable_file(CIFS_I(inode), true);
+        if (!open_file)
+                return get_smb2_acl_by_path(cifs_sb, path, pacllen);
+
+        pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
+        cifsFileInfo_put(open_file);
+        return pntsd;
+}
+
+
 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
                             loff_t offset, loff_t len, bool keep_size)
 {
@@ -2393,6 +2494,11 @@ struct smb_version_operations smb20_operations = {
         .dir_needs_close = smb2_dir_needs_close,
         .get_dfs_refer = smb2_get_dfs_refer,
         .select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_ACL
+        .get_acl = get_smb2_acl,
+        .get_acl_by_fid = get_smb2_acl_by_fid,
+/*      .set_acl = set_smb3_acl, */
+#endif /* CIFS_ACL */
 };
 
 struct smb_version_operations smb21_operations = {
@@ -2477,6 +2583,11 @@ struct smb_version_operations smb21_operations = {
         .enum_snapshots = smb3_enum_snapshots,
         .get_dfs_refer = smb2_get_dfs_refer,
         .select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_ACL
+        .get_acl = get_smb2_acl,
+        .get_acl_by_fid = get_smb2_acl_by_fid,
+/*      .set_acl = set_smb3_acl, */
+#endif /* CIFS_ACL */
 };
 
 struct smb_version_operations smb30_operations = {
@@ -2571,6 +2682,11 @@ struct smb_version_operations smb30_operations = {
         .receive_transform = smb3_receive_transform,
         .get_dfs_refer = smb2_get_dfs_refer,
         .select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_ACL
+        .get_acl = get_smb2_acl,
+        .get_acl_by_fid = get_smb2_acl_by_fid,
+/*      .set_acl = set_smb3_acl, */
+#endif /* CIFS_ACL */
 };
 
 #ifdef CONFIG_CIFS_SMB311