s3:smbd: add file_set_sparse() function

this is based on a patch for 3.3 from metze

diff --git a/source3/include/proto.h b/source3/include/proto.h
index 9b41321df6c6ad6af50f99961a7fbc2aa73652fc..53c1f5d370aa7cb0fe6c8ee11c639372f017ce54 100644 (file)
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -4620,6 +4620,9 @@ int dos_attributes_to_stat_dos_flags(uint32_t dosmode);
 uint32 dos_mode(connection_struct *conn, struct smb_filename *smb_fname);
 int file_set_dosmode(connection_struct *conn, struct smb_filename *smb_fname,
                     uint32 dosmode, const char *parent_dir, bool newfile);
+NTSTATUS file_set_sparse(connection_struct *conn,
+                        struct smb_filename *smb_fname,
+                        bool sparse);
 int file_ntimes(connection_struct *conn, const struct smb_filename *smb_fname,
                struct smb_file_time *ft);
 bool set_sticky_write_time_path(struct file_id fileid, struct timespec mtime);

diff --git a/source3/smbd/dosmode.c b/source3/smbd/dosmode.c
index 2fafb15c6e987aaa5a2f0928c0bbd2b2e36700d0..5d6e4b4760e439edde01ae0f976609e90a06f8ad 100644 (file)
--- a/source3/smbd/dosmode.c
+++ b/source3/smbd/dosmode.c
@@ -846,6 +846,55 @@ int file_set_dosmode(connection_struct *conn, struct smb_filename *smb_fname,
        return( ret );
 }
 
+
+NTSTATUS file_set_sparse(connection_struct *conn,
+                        struct smb_filename *smb_fname,
+                        bool sparse)
+{
+       SMB_STRUCT_STAT st;
+       uint32_t old_dosmode;
+       uint32_t new_dosmode;
+
+       DEBUG(10,("file_set_sparse: setting sparse bit %u on file %s\n",
+                 sparse, smb_fname_str_dbg(smb_fname)));
+
+       if (!lp_store_dos_attributes(SNUM(conn))) {
+               return NT_STATUS_INVALID_DEVICE_REQUEST;
+       }
+
+       SET_STAT_INVALID(st);
+
+       if (SMB_VFS_STAT(conn, smb_fname)) {
+               return map_nt_error_from_unix(errno);
+       }
+
+       old_dosmode = dos_mode(conn, smb_fname);
+
+       if (sparse && !(old_dosmode & FILE_ATTRIBUTE_SPARSE)) {
+               new_dosmode = old_dosmode | FILE_ATTRIBUTE_SPARSE;
+       } else if (!sparse && (old_dosmode & FILE_ATTRIBUTE_SPARSE)) {
+               new_dosmode = old_dosmode & ~FILE_ATTRIBUTE_SPARSE;
+       } else {
+               return NT_STATUS_OK;
+       }
+
+       /* Store the DOS attributes in an EA. */
+       if (!set_ea_dos_attribute(conn, smb_fname,
+                                 new_dosmode)) {
+               if (errno == 0) {
+                       errno = EIO;
+               }
+               return map_nt_error_from_unix(errno);
+       }
+
+       notify_fname(conn, NOTIFY_ACTION_MODIFIED,
+                    FILE_NOTIFY_CHANGE_ATTRIBUTES,
+                    smb_fname->base_name);
+
+       return NT_STATUS_OK;
+}
+
+
 /*******************************************************************
  Wrapper around the VFS ntimes that possibly allows DOS semantics rather
  than POSIX.