This version of sg for the lk 2.5 series re-adds direct IO

support using work done by Kai Makisara (on st driver, posted
2002/7/29).

Changelog:
    Changes since 3.5.26 (20020708)
        - re-add direct IO using Kai Makisara's work
        - re-tab to 8, start using C99-isms
        - simplify memory management

Like Kai's patch, this one needs kernel/ksyms.c altered
to export get_user_pages(). Kai's worker routines
st_map_user_pages() and st_unmap_user_pages() are duplicated
as is. Hopefully these routines will find a home in
a library soon.

The re-tabbing makes the patches rather large so here
are 2 urls:
This tarball contains sg.h and sg.c 
	http://www.torque.net/sg/p/sg3527.tgz
This gzipped patch is against lk 2.5.31 and touches
kernel/ksyms.c as well
	http://www.torque.net/sg/p/sg_3527_lk2531.diff.gz

Testing is ongoing, everything works apart from "zero
copy" copy. That uses mmap-ed IO on the read side and
direct IO on the write side. Not too many people would
be using that I suspect.

Doug Gilbert

include/scsi/sg.h

@@ -11,9 +11,13 @@ Original driver (sg.h):
 Version 2 and 3 extensions to driver:
 *       Copyright (C) 1998 - 2002 Douglas Gilbert
 
-    Version: 3.5.26 (20020708)
+    Version: 3.5.27 (20020812)
     This version is for 2.5 series kernels.
 
+    Changes since 3.5.26 (20020708)
+	- re-add direct IO using Kai Makisara's work
+	- re-tab to 8, start using C99-isms
+	- simplify memory management
     Changes since 3.5.25 (20020504)
 	- driverfs additions
 	- copy_to/from_user() fixes [William Stinson]

kernel/ksyms.c

@@ -126,6 +126,7 @@ EXPORT_SYMBOL(highmem_start_page);
 EXPORT_SYMBOL(kmap_prot);
 EXPORT_SYMBOL(kmap_pte);
 #endif
+EXPORT_SYMBOL(get_user_pages);
 
 /* filesystem internal functions */
 EXPORT_SYMBOL(def_blk_fops);