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Subject[2.5 patch] re-add zft_dirty to zftape-ctl.c
Hi Alan,

your

[PATCH] rescue ftape from the ravages of that Rusty chap

removed zft_dirty from zftape-ctl.c in Linus' 2.5 tree. This seems to be
accidentially and wrong, it was the only definition of zft_dirty in the
whole kernel sources and now there's an error at the final linking of
the kernel. The patch below (against 2.5.54) re-adds it.

cu
Adrian

--- linux/drivers/char/ftape/zftape/zftape-ctl.c 2003-01-02 04:21:44.000000000 +0100
+++ linux/drivers/char/ftape/zftape/zftape-ctl.c 2000-10-16 21:58:51.000000000 +0200
@@ -648,6 +648,50 @@
TRACE_EXIT 0;
}

+/* decide when we should lock the module in memory, even when calling
+ * the release routine. This really is necessary for use with
+ * kerneld.
+ *
+ * NOTE: we MUST NOT use zft_write_protected, because this includes
+ * the file access mode as well which has no meaning with our
+ * asynchronous update scheme.
+ *
+ * Ugly, ugly. We need to look the module if we changed the block size.
+ * How sad! Need persistent modules storage!
+ *
+ * NOTE: I don't want to lock the module if the number of dma buffers
+ * has been changed. It's enough! Stop the story! Give me persisitent
+ * module storage! Do it!
+ */
+int zft_dirty(void)
+{
+ if (!ft_formatted || zft_offline) {
+ /* cannot be dirty if not formatted or offline */
+ return 0;
+ }
+ if (zft_blk_sz != CONFIG_ZFT_DFLT_BLK_SZ) {
+ /* blocksize changed, must lock */
+ return 1;
+ }
+ if (zft_mt_compression != 0) {
+ /* compression mode with /dev/qft, must lock */
+ return 1;
+ }
+ if (!zft_header_read) {
+ /* tape is logical at BOT, no lock */
+ return 0;
+ }
+ if (!zft_tape_at_lbot(&zft_pos)) {
+ /* somewhere inside a volume, lock tape */
+ return 1;
+ }
+ if (zft_volume_table_changed || zft_header_changed) {
+ /* header segments dirty if tape not write protected */
+ return !(ft_write_protected || zft_old_ftape);
+ }
+ return 0;
+}
+
/* OPEN routine called by kernel-interface code
*
* NOTE: this is also called by mt_reset() with dev_minor == -1
-
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