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![Linus Torvalds](/assets/img/avatar_default.png)
Main features: - RAID10 arrays can be reshapes - adding and removing devices and changing chunks (not 'far' array though) - allow RAID5 arrays to be reshaped with a backup file (not tested yet, but the priciple works fine for RAID10). - arrays can be reshaped while a bitmap is present - you no longer need to remove it first - SSSE3 support for RAID6 syndrome calculations and of course a number of minor fixes etc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUAT7xXijnsnt1WYoG5AQLvFg/+OGeptY2cRu3HpsNsibvIyfiOYSlDpLo+ 2tYzBz2wFiFROfj41aV/PdeqE3xn/RelDmIgt9Apaimeg453O6IdjI9X00fPrgxV ATWkwWy5ykozbLIsyJYQ/kLPo0NX2KR/TtEim2lwlEjs4bLsF8TGvRa6ylcko0zI j6cbqVzkCDHXzLk/M6l0UoUaSG1PcjO6M10KBM7bS2sLoxhkn69gT7YTIlFySXW4 epNYSTKyeuSmEUI7L09s5HLf/zPZSp4MipoRIqQYcwk5gvmMNNuLbouDECvZ5BdV TXxrVVSlh7tFSeoGwYXQXcv/nFg3n53Mc+Nimzo7hhmI5ytRR9Y0c6SwvRBCN7t6 HzapQu+vBqDIPzedH+6r/gk39Auzm60JjGDYHiSdjZCAWefcYUmYm/Iso9JJ/0hg PVkSfnkgaFUx0GhXS+C9YgPHYlb5DnTCCMrbtQCL65D61D2det3oZtrQPfKIKMlw SRz2Ls+4o4UhAY7JLYNhONa0mtxhk5VTZ3LH58I9+ZurVyvqrjvCV+neSiCUsRog jT038/gT5nJ8HPsg5feQ9cS0TbEo92eg3gILy1D5cPTaMZhrV8gq0Ke7xgmBo0+Q bWh4vxU9SM/96c/umCxcmHymKAFhsMVFbJTg4r9K5atFGNyMegJYedFFEEbQMQI3 u+KRDXHN700= =q8bc -----END PGP SIGNATURE----- Merge tag 'md-3.5' of git://neil.brown.name/md Pull md updates from NeilBrown: "It's been a busy cycle for md - lots of fun stuff here.. if you like this kind of thing :-) Main features: - RAID10 arrays can be reshaped - adding and removing devices and changing chunks (not 'far' array though) - allow RAID5 arrays to be reshaped with a backup file (not tested yet, but the priciple works fine for RAID10). - arrays can be reshaped while a bitmap is present - you no longer need to remove it first - SSSE3 support for RAID6 syndrome calculations and of course a number of minor fixes etc." * tag 'md-3.5' of git://neil.brown.name/md: (56 commits) md/bitmap: record the space available for the bitmap in the superblock. md/raid10: Remove extras after reshape to smaller number of devices. md/raid5: improve removal of extra devices after reshape. md: check the return of mddev_find() MD RAID1: Further conditionalize 'fullsync' DM RAID: Use md_error() in place of simply setting Faulty bit DM RAID: Record and handle missing devices DM RAID: Set recovery flags on resume md/raid5: Allow reshape while a bitmap is present. md/raid10: resize bitmap when required during reshape. md: allow array to be resized while bitmap is present. md/bitmap: make sure reshape request are reflected in superblock. md/bitmap: add bitmap_resize function to allow bitmap resizing. md/bitmap: use DIV_ROUND_UP instead of open-code md/bitmap: create a 'struct bitmap_counts' substructure of 'struct bitmap' md/bitmap: make bitmap bitops atomic. md/bitmap: make _page_attr bitops atomic. md/bitmap: merge bitmap_file_unmap and bitmap_file_put. md/bitmap: remove async freeing of bitmap file. md/bitmap: convert some spin_lock_irqsave to spin_lock_irq ...
169 lines
4 KiB
C
169 lines
4 KiB
C
/*
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* xor.c : Multiple Devices driver for Linux
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000,
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* Ingo Molnar, Matti Aarnio, Jakub Jelinek, Richard Henderson.
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*
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* Dispatch optimized RAID-5 checksumming functions.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* You should have received a copy of the GNU General Public License
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* (for example /usr/src/linux/COPYING); if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define BH_TRACE 0
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#include <linux/module.h>
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#include <linux/gfp.h>
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#include <linux/raid/xor.h>
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#include <linux/jiffies.h>
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#include <linux/preempt.h>
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#include <asm/xor.h>
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/* The xor routines to use. */
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static struct xor_block_template *active_template;
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void
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xor_blocks(unsigned int src_count, unsigned int bytes, void *dest, void **srcs)
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{
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unsigned long *p1, *p2, *p3, *p4;
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p1 = (unsigned long *) srcs[0];
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if (src_count == 1) {
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active_template->do_2(bytes, dest, p1);
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return;
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}
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p2 = (unsigned long *) srcs[1];
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if (src_count == 2) {
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active_template->do_3(bytes, dest, p1, p2);
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return;
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}
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p3 = (unsigned long *) srcs[2];
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if (src_count == 3) {
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active_template->do_4(bytes, dest, p1, p2, p3);
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return;
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}
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p4 = (unsigned long *) srcs[3];
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active_template->do_5(bytes, dest, p1, p2, p3, p4);
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}
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EXPORT_SYMBOL(xor_blocks);
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/* Set of all registered templates. */
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static struct xor_block_template *template_list;
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#define BENCH_SIZE (PAGE_SIZE)
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static void
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do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
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{
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int speed;
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unsigned long now, j;
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int i, count, max;
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tmpl->next = template_list;
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template_list = tmpl;
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preempt_disable();
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/*
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* Count the number of XORs done during a whole jiffy, and use
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* this to calculate the speed of checksumming. We use a 2-page
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* allocation to have guaranteed color L1-cache layout.
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*/
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max = 0;
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for (i = 0; i < 5; i++) {
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j = jiffies;
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count = 0;
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while ((now = jiffies) == j)
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cpu_relax();
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while (time_before(jiffies, now + 1)) {
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mb(); /* prevent loop optimzation */
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tmpl->do_2(BENCH_SIZE, b1, b2);
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mb();
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count++;
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mb();
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}
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if (count > max)
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max = count;
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}
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preempt_enable();
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speed = max * (HZ * BENCH_SIZE / 1024);
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tmpl->speed = speed;
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printk(KERN_INFO " %-10s: %5d.%03d MB/sec\n", tmpl->name,
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speed / 1000, speed % 1000);
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}
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static int __init
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calibrate_xor_blocks(void)
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{
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void *b1, *b2;
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struct xor_block_template *f, *fastest;
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/*
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* Note: Since the memory is not actually used for _anything_ but to
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* test the XOR speed, we don't really want kmemcheck to warn about
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* reading uninitialized bytes here.
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*/
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b1 = (void *) __get_free_pages(GFP_KERNEL | __GFP_NOTRACK, 2);
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if (!b1) {
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printk(KERN_WARNING "xor: Yikes! No memory available.\n");
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return -ENOMEM;
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}
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b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE;
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/*
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* If this arch/cpu has a short-circuited selection, don't loop through
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* all the possible functions, just test the best one
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*/
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fastest = NULL;
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#ifdef XOR_SELECT_TEMPLATE
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fastest = XOR_SELECT_TEMPLATE(fastest);
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#endif
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#define xor_speed(templ) do_xor_speed((templ), b1, b2)
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if (fastest) {
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printk(KERN_INFO "xor: automatically using best "
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"checksumming function:\n");
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xor_speed(fastest);
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goto out;
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} else {
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printk(KERN_INFO "xor: measuring software checksum speed\n");
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XOR_TRY_TEMPLATES;
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fastest = template_list;
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for (f = fastest; f; f = f->next)
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if (f->speed > fastest->speed)
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fastest = f;
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}
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printk(KERN_INFO "xor: using function: %s (%d.%03d MB/sec)\n",
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fastest->name, fastest->speed / 1000, fastest->speed % 1000);
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#undef xor_speed
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out:
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free_pages((unsigned long)b1, 2);
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active_template = fastest;
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return 0;
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}
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static __exit void xor_exit(void) { }
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MODULE_LICENSE("GPL");
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/* when built-in xor.o must initialize before drivers/md/md.o */
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core_initcall(calibrate_xor_blocks);
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module_exit(xor_exit);
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