![NeilBrown](/assets/img/avatar_default.png)
If a bitmap is added while the array is active, it is possible for bitmap_daemon_work to run while the bitmap is being initialised. This is particularly a problem if bitmap_daemon_work sees bitmap->filemap as non-NULL before it has been filled in properly. So hold bitmap_info.mutex while filling in ->filemap to prevent problems. This patch is suitable for any -stable kernel, though it might not apply cleanly before about 3.1. Cc: stable@vger.kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
2115 lines
55 KiB
C
2115 lines
55 KiB
C
/*
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* bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003
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*
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* bitmap_create - sets up the bitmap structure
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* bitmap_destroy - destroys the bitmap structure
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*
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* additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.:
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* - added disk storage for bitmap
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* - changes to allow various bitmap chunk sizes
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*/
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/*
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* Still to do:
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*
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* flush after percent set rather than just time based. (maybe both).
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*/
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#include <linux/blkdev.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/sched.h>
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#include <linux/list.h>
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#include <linux/file.h>
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#include <linux/mount.h>
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#include <linux/buffer_head.h>
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#include <linux/seq_file.h>
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#include "md.h"
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#include "bitmap.h"
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static inline char *bmname(struct bitmap *bitmap)
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{
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return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";
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}
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/*
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* check a page and, if necessary, allocate it (or hijack it if the alloc fails)
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*
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* 1) check to see if this page is allocated, if it's not then try to alloc
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* 2) if the alloc fails, set the page's hijacked flag so we'll use the
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* page pointer directly as a counter
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*
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* if we find our page, we increment the page's refcount so that it stays
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* allocated while we're using it
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*/
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static int bitmap_checkpage(struct bitmap *bitmap,
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unsigned long page, int create)
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__releases(bitmap->lock)
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__acquires(bitmap->lock)
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{
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unsigned char *mappage;
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if (page >= bitmap->pages) {
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/* This can happen if bitmap_start_sync goes beyond
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* End-of-device while looking for a whole page.
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* It is harmless.
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*/
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return -EINVAL;
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}
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if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */
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return 0;
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if (bitmap->bp[page].map) /* page is already allocated, just return */
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return 0;
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if (!create)
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return -ENOENT;
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/* this page has not been allocated yet */
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spin_unlock_irq(&bitmap->lock);
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mappage = kzalloc(PAGE_SIZE, GFP_NOIO);
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spin_lock_irq(&bitmap->lock);
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if (mappage == NULL) {
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pr_debug("%s: bitmap map page allocation failed, hijacking\n",
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bmname(bitmap));
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/* failed - set the hijacked flag so that we can use the
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* pointer as a counter */
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if (!bitmap->bp[page].map)
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bitmap->bp[page].hijacked = 1;
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} else if (bitmap->bp[page].map ||
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bitmap->bp[page].hijacked) {
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/* somebody beat us to getting the page */
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kfree(mappage);
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return 0;
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} else {
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/* no page was in place and we have one, so install it */
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bitmap->bp[page].map = mappage;
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bitmap->missing_pages--;
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}
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return 0;
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}
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/* if page is completely empty, put it back on the free list, or dealloc it */
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/* if page was hijacked, unmark the flag so it might get alloced next time */
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/* Note: lock should be held when calling this */
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static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page)
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{
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char *ptr;
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if (bitmap->bp[page].count) /* page is still busy */
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return;
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/* page is no longer in use, it can be released */
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if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */
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bitmap->bp[page].hijacked = 0;
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bitmap->bp[page].map = NULL;
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} else {
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/* normal case, free the page */
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ptr = bitmap->bp[page].map;
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bitmap->bp[page].map = NULL;
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bitmap->missing_pages++;
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kfree(ptr);
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}
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}
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/*
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* bitmap file handling - read and write the bitmap file and its superblock
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*/
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/*
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* basic page I/O operations
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*/
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/* IO operations when bitmap is stored near all superblocks */
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static struct page *read_sb_page(struct mddev *mddev, loff_t offset,
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struct page *page,
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unsigned long index, int size)
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{
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/* choose a good rdev and read the page from there */
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struct md_rdev *rdev;
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sector_t target;
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int did_alloc = 0;
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if (!page) {
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page = alloc_page(GFP_KERNEL);
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if (!page)
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return ERR_PTR(-ENOMEM);
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did_alloc = 1;
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}
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rdev_for_each(rdev, mddev) {
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if (! test_bit(In_sync, &rdev->flags)
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|| test_bit(Faulty, &rdev->flags))
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continue;
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target = offset + index * (PAGE_SIZE/512);
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if (sync_page_io(rdev, target,
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roundup(size, bdev_logical_block_size(rdev->bdev)),
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page, READ, true)) {
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page->index = index;
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attach_page_buffers(page, NULL); /* so that free_buffer will
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* quietly no-op */
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return page;
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}
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}
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if (did_alloc)
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put_page(page);
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return ERR_PTR(-EIO);
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}
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static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev)
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{
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/* Iterate the disks of an mddev, using rcu to protect access to the
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* linked list, and raising the refcount of devices we return to ensure
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* they don't disappear while in use.
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* As devices are only added or removed when raid_disk is < 0 and
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* nr_pending is 0 and In_sync is clear, the entries we return will
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* still be in the same position on the list when we re-enter
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* list_for_each_continue_rcu.
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*/
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struct list_head *pos;
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rcu_read_lock();
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if (rdev == NULL)
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/* start at the beginning */
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pos = &mddev->disks;
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else {
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/* release the previous rdev and start from there. */
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rdev_dec_pending(rdev, mddev);
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pos = &rdev->same_set;
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}
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list_for_each_continue_rcu(pos, &mddev->disks) {
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rdev = list_entry(pos, struct md_rdev, same_set);
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if (rdev->raid_disk >= 0 &&
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!test_bit(Faulty, &rdev->flags)) {
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/* this is a usable devices */
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atomic_inc(&rdev->nr_pending);
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rcu_read_unlock();
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return rdev;
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}
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}
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rcu_read_unlock();
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return NULL;
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}
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static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
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{
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struct md_rdev *rdev = NULL;
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struct block_device *bdev;
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struct mddev *mddev = bitmap->mddev;
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while ((rdev = next_active_rdev(rdev, mddev)) != NULL) {
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int size = PAGE_SIZE;
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loff_t offset = mddev->bitmap_info.offset;
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bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev;
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if (page->index == bitmap->file_pages-1)
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size = roundup(bitmap->last_page_size,
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bdev_logical_block_size(bdev));
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/* Just make sure we aren't corrupting data or
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* metadata
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*/
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if (mddev->external) {
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/* Bitmap could be anywhere. */
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if (rdev->sb_start + offset + (page->index
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* (PAGE_SIZE/512))
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> rdev->data_offset
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&&
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rdev->sb_start + offset
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< (rdev->data_offset + mddev->dev_sectors
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+ (PAGE_SIZE/512)))
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goto bad_alignment;
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} else if (offset < 0) {
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/* DATA BITMAP METADATA */
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if (offset
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+ (long)(page->index * (PAGE_SIZE/512))
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+ size/512 > 0)
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/* bitmap runs in to metadata */
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goto bad_alignment;
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if (rdev->data_offset + mddev->dev_sectors
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> rdev->sb_start + offset)
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/* data runs in to bitmap */
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goto bad_alignment;
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} else if (rdev->sb_start < rdev->data_offset) {
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/* METADATA BITMAP DATA */
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if (rdev->sb_start
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+ offset
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+ page->index*(PAGE_SIZE/512) + size/512
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> rdev->data_offset)
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/* bitmap runs in to data */
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goto bad_alignment;
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} else {
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/* DATA METADATA BITMAP - no problems */
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}
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md_super_write(mddev, rdev,
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rdev->sb_start + offset
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+ page->index * (PAGE_SIZE/512),
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size,
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page);
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}
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if (wait)
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md_super_wait(mddev);
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return 0;
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bad_alignment:
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return -EINVAL;
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}
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static void bitmap_file_kick(struct bitmap *bitmap);
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/*
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* write out a page to a file
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*/
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static void write_page(struct bitmap *bitmap, struct page *page, int wait)
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{
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struct buffer_head *bh;
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if (bitmap->file == NULL) {
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switch (write_sb_page(bitmap, page, wait)) {
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case -EINVAL:
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bitmap->flags |= BITMAP_WRITE_ERROR;
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}
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} else {
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bh = page_buffers(page);
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while (bh && bh->b_blocknr) {
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atomic_inc(&bitmap->pending_writes);
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set_buffer_locked(bh);
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set_buffer_mapped(bh);
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submit_bh(WRITE | REQ_SYNC, bh);
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bh = bh->b_this_page;
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}
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if (wait)
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wait_event(bitmap->write_wait,
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atomic_read(&bitmap->pending_writes)==0);
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}
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if (bitmap->flags & BITMAP_WRITE_ERROR)
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bitmap_file_kick(bitmap);
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}
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static void end_bitmap_write(struct buffer_head *bh, int uptodate)
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{
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struct bitmap *bitmap = bh->b_private;
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unsigned long flags;
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if (!uptodate) {
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spin_lock_irqsave(&bitmap->lock, flags);
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bitmap->flags |= BITMAP_WRITE_ERROR;
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spin_unlock_irqrestore(&bitmap->lock, flags);
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}
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if (atomic_dec_and_test(&bitmap->pending_writes))
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wake_up(&bitmap->write_wait);
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}
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/* copied from buffer.c */
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static void
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__clear_page_buffers(struct page *page)
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{
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ClearPagePrivate(page);
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set_page_private(page, 0);
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page_cache_release(page);
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}
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static void free_buffers(struct page *page)
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{
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struct buffer_head *bh = page_buffers(page);
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while (bh) {
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struct buffer_head *next = bh->b_this_page;
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free_buffer_head(bh);
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bh = next;
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}
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__clear_page_buffers(page);
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put_page(page);
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}
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/* read a page from a file.
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* We both read the page, and attach buffers to the page to record the
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* address of each block (using bmap). These addresses will be used
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* to write the block later, completely bypassing the filesystem.
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* This usage is similar to how swap files are handled, and allows us
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* to write to a file with no concerns of memory allocation failing.
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*/
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static struct page *read_page(struct file *file, unsigned long index,
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struct bitmap *bitmap,
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unsigned long count)
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{
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struct page *page = NULL;
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struct inode *inode = file->f_path.dentry->d_inode;
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struct buffer_head *bh;
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sector_t block;
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pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE,
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(unsigned long long)index << PAGE_SHIFT);
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page = alloc_page(GFP_KERNEL);
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if (!page)
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page = ERR_PTR(-ENOMEM);
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if (IS_ERR(page))
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goto out;
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bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0);
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if (!bh) {
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put_page(page);
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page = ERR_PTR(-ENOMEM);
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goto out;
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}
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attach_page_buffers(page, bh);
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block = index << (PAGE_SHIFT - inode->i_blkbits);
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while (bh) {
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if (count == 0)
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bh->b_blocknr = 0;
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else {
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bh->b_blocknr = bmap(inode, block);
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if (bh->b_blocknr == 0) {
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/* Cannot use this file! */
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free_buffers(page);
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page = ERR_PTR(-EINVAL);
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goto out;
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}
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bh->b_bdev = inode->i_sb->s_bdev;
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if (count < (1<<inode->i_blkbits))
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count = 0;
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else
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count -= (1<<inode->i_blkbits);
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bh->b_end_io = end_bitmap_write;
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bh->b_private = bitmap;
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atomic_inc(&bitmap->pending_writes);
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set_buffer_locked(bh);
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set_buffer_mapped(bh);
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submit_bh(READ, bh);
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}
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block++;
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bh = bh->b_this_page;
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}
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page->index = index;
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wait_event(bitmap->write_wait,
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atomic_read(&bitmap->pending_writes)==0);
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if (bitmap->flags & BITMAP_WRITE_ERROR) {
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free_buffers(page);
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page = ERR_PTR(-EIO);
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}
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out:
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if (IS_ERR(page))
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printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %ld\n",
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(int)PAGE_SIZE,
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(unsigned long long)index << PAGE_SHIFT,
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PTR_ERR(page));
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return page;
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}
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/*
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* bitmap file superblock operations
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*/
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/* update the event counter and sync the superblock to disk */
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void bitmap_update_sb(struct bitmap *bitmap)
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{
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bitmap_super_t *sb;
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if (!bitmap || !bitmap->mddev) /* no bitmap for this array */
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return;
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if (bitmap->mddev->bitmap_info.external)
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return;
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if (!bitmap->sb_page) /* no superblock */
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return;
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sb = kmap_atomic(bitmap->sb_page);
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sb->events = cpu_to_le64(bitmap->mddev->events);
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if (bitmap->mddev->events < bitmap->events_cleared)
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/* rocking back to read-only */
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bitmap->events_cleared = bitmap->mddev->events;
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sb->events_cleared = cpu_to_le64(bitmap->events_cleared);
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sb->state = cpu_to_le32(bitmap->flags);
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/* Just in case these have been changed via sysfs: */
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sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
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sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
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kunmap_atomic(sb);
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write_page(bitmap, bitmap->sb_page, 1);
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}
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/* print out the bitmap file superblock */
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void bitmap_print_sb(struct bitmap *bitmap)
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{
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bitmap_super_t *sb;
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if (!bitmap || !bitmap->sb_page)
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return;
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sb = kmap_atomic(bitmap->sb_page);
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printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap));
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printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic));
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printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version));
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printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n",
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*(__u32 *)(sb->uuid+0),
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*(__u32 *)(sb->uuid+4),
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*(__u32 *)(sb->uuid+8),
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*(__u32 *)(sb->uuid+12));
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printk(KERN_DEBUG " events: %llu\n",
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(unsigned long long) le64_to_cpu(sb->events));
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printk(KERN_DEBUG "events cleared: %llu\n",
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(unsigned long long) le64_to_cpu(sb->events_cleared));
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printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state));
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printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize));
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printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep));
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printk(KERN_DEBUG " sync size: %llu KB\n",
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(unsigned long long)le64_to_cpu(sb->sync_size)/2);
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printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind));
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kunmap_atomic(sb);
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}
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|
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/*
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* bitmap_new_disk_sb
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* @bitmap
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*
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* This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb
|
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* reads and verifies the on-disk bitmap superblock and populates bitmap_info.
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* This function verifies 'bitmap_info' and populates the on-disk bitmap
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* structure, which is to be written to disk.
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*
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* Returns: 0 on success, -Exxx on error
|
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*/
|
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static int bitmap_new_disk_sb(struct bitmap *bitmap)
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{
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bitmap_super_t *sb;
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unsigned long chunksize, daemon_sleep, write_behind;
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int err = -EINVAL;
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|
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bitmap->sb_page = alloc_page(GFP_KERNEL);
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if (IS_ERR(bitmap->sb_page)) {
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err = PTR_ERR(bitmap->sb_page);
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bitmap->sb_page = NULL;
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return err;
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}
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bitmap->sb_page->index = 0;
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|
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sb = kmap_atomic(bitmap->sb_page);
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|
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sb->magic = cpu_to_le32(BITMAP_MAGIC);
|
|
sb->version = cpu_to_le32(BITMAP_MAJOR_HI);
|
|
|
|
chunksize = bitmap->mddev->bitmap_info.chunksize;
|
|
BUG_ON(!chunksize);
|
|
if (!is_power_of_2(chunksize)) {
|
|
kunmap_atomic(sb);
|
|
printk(KERN_ERR "bitmap chunksize not a power of 2\n");
|
|
return -EINVAL;
|
|
}
|
|
sb->chunksize = cpu_to_le32(chunksize);
|
|
|
|
daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep;
|
|
if (!daemon_sleep ||
|
|
(daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) {
|
|
printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n");
|
|
daemon_sleep = 5 * HZ;
|
|
}
|
|
sb->daemon_sleep = cpu_to_le32(daemon_sleep);
|
|
bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
|
|
|
|
/*
|
|
* FIXME: write_behind for RAID1. If not specified, what
|
|
* is a good choice? We choose COUNTER_MAX / 2 arbitrarily.
|
|
*/
|
|
write_behind = bitmap->mddev->bitmap_info.max_write_behind;
|
|
if (write_behind > COUNTER_MAX)
|
|
write_behind = COUNTER_MAX / 2;
|
|
sb->write_behind = cpu_to_le32(write_behind);
|
|
bitmap->mddev->bitmap_info.max_write_behind = write_behind;
|
|
|
|
/* keep the array size field of the bitmap superblock up to date */
|
|
sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
|
|
|
|
memcpy(sb->uuid, bitmap->mddev->uuid, 16);
|
|
|
|
bitmap->flags |= BITMAP_STALE;
|
|
sb->state |= cpu_to_le32(BITMAP_STALE);
|
|
bitmap->events_cleared = bitmap->mddev->events;
|
|
sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
|
|
|
|
kunmap_atomic(sb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* read the superblock from the bitmap file and initialize some bitmap fields */
|
|
static int bitmap_read_sb(struct bitmap *bitmap)
|
|
{
|
|
char *reason = NULL;
|
|
bitmap_super_t *sb;
|
|
unsigned long chunksize, daemon_sleep, write_behind;
|
|
unsigned long long events;
|
|
int err = -EINVAL;
|
|
|
|
/* page 0 is the superblock, read it... */
|
|
if (bitmap->file) {
|
|
loff_t isize = i_size_read(bitmap->file->f_mapping->host);
|
|
int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
|
|
|
|
bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes);
|
|
} else {
|
|
bitmap->sb_page = read_sb_page(bitmap->mddev,
|
|
bitmap->mddev->bitmap_info.offset,
|
|
NULL,
|
|
0, sizeof(bitmap_super_t));
|
|
}
|
|
if (IS_ERR(bitmap->sb_page)) {
|
|
err = PTR_ERR(bitmap->sb_page);
|
|
bitmap->sb_page = NULL;
|
|
return err;
|
|
}
|
|
|
|
sb = kmap_atomic(bitmap->sb_page);
|
|
|
|
chunksize = le32_to_cpu(sb->chunksize);
|
|
daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
|
|
write_behind = le32_to_cpu(sb->write_behind);
|
|
|
|
/* verify that the bitmap-specific fields are valid */
|
|
if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
|
|
reason = "bad magic";
|
|
else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO ||
|
|
le32_to_cpu(sb->version) > BITMAP_MAJOR_HI)
|
|
reason = "unrecognized superblock version";
|
|
else if (chunksize < 512)
|
|
reason = "bitmap chunksize too small";
|
|
else if (!is_power_of_2(chunksize))
|
|
reason = "bitmap chunksize not a power of 2";
|
|
else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT)
|
|
reason = "daemon sleep period out of range";
|
|
else if (write_behind > COUNTER_MAX)
|
|
reason = "write-behind limit out of range (0 - 16383)";
|
|
if (reason) {
|
|
printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n",
|
|
bmname(bitmap), reason);
|
|
goto out;
|
|
}
|
|
|
|
/* keep the array size field of the bitmap superblock up to date */
|
|
sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
|
|
|
|
if (bitmap->mddev->persistent) {
|
|
/*
|
|
* We have a persistent array superblock, so compare the
|
|
* bitmap's UUID and event counter to the mddev's
|
|
*/
|
|
if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) {
|
|
printk(KERN_INFO
|
|
"%s: bitmap superblock UUID mismatch\n",
|
|
bmname(bitmap));
|
|
goto out;
|
|
}
|
|
events = le64_to_cpu(sb->events);
|
|
if (events < bitmap->mddev->events) {
|
|
printk(KERN_INFO
|
|
"%s: bitmap file is out of date (%llu < %llu) "
|
|
"-- forcing full recovery\n",
|
|
bmname(bitmap), events,
|
|
(unsigned long long) bitmap->mddev->events);
|
|
sb->state |= cpu_to_le32(BITMAP_STALE);
|
|
}
|
|
}
|
|
|
|
/* assign fields using values from superblock */
|
|
bitmap->mddev->bitmap_info.chunksize = chunksize;
|
|
bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
|
|
bitmap->mddev->bitmap_info.max_write_behind = write_behind;
|
|
bitmap->flags |= le32_to_cpu(sb->state);
|
|
if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
|
|
bitmap->flags |= BITMAP_HOSTENDIAN;
|
|
bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
|
|
if (bitmap->flags & BITMAP_STALE)
|
|
bitmap->events_cleared = bitmap->mddev->events;
|
|
err = 0;
|
|
out:
|
|
kunmap_atomic(sb);
|
|
if (err)
|
|
bitmap_print_sb(bitmap);
|
|
return err;
|
|
}
|
|
|
|
enum bitmap_mask_op {
|
|
MASK_SET,
|
|
MASK_UNSET
|
|
};
|
|
|
|
/* record the state of the bitmap in the superblock. Return the old value */
|
|
static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
|
|
enum bitmap_mask_op op)
|
|
{
|
|
bitmap_super_t *sb;
|
|
int old;
|
|
|
|
if (!bitmap->sb_page) /* can't set the state */
|
|
return 0;
|
|
sb = kmap_atomic(bitmap->sb_page);
|
|
old = le32_to_cpu(sb->state) & bits;
|
|
switch (op) {
|
|
case MASK_SET:
|
|
sb->state |= cpu_to_le32(bits);
|
|
bitmap->flags |= bits;
|
|
break;
|
|
case MASK_UNSET:
|
|
sb->state &= cpu_to_le32(~bits);
|
|
bitmap->flags &= ~bits;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
kunmap_atomic(sb);
|
|
return old;
|
|
}
|
|
|
|
/*
|
|
* general bitmap file operations
|
|
*/
|
|
|
|
/*
|
|
* on-disk bitmap:
|
|
*
|
|
* Use one bit per "chunk" (block set). We do the disk I/O on the bitmap
|
|
* file a page at a time. There's a superblock at the start of the file.
|
|
*/
|
|
/* calculate the index of the page that contains this bit */
|
|
static inline unsigned long file_page_index(struct bitmap *bitmap, unsigned long chunk)
|
|
{
|
|
if (!bitmap->mddev->bitmap_info.external)
|
|
chunk += sizeof(bitmap_super_t) << 3;
|
|
return chunk >> PAGE_BIT_SHIFT;
|
|
}
|
|
|
|
/* calculate the (bit) offset of this bit within a page */
|
|
static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned long chunk)
|
|
{
|
|
if (!bitmap->mddev->bitmap_info.external)
|
|
chunk += sizeof(bitmap_super_t) << 3;
|
|
return chunk & (PAGE_BITS - 1);
|
|
}
|
|
|
|
/*
|
|
* return a pointer to the page in the filemap that contains the given bit
|
|
*
|
|
* this lookup is complicated by the fact that the bitmap sb might be exactly
|
|
* 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page
|
|
* 0 or page 1
|
|
*/
|
|
static inline struct page *filemap_get_page(struct bitmap *bitmap,
|
|
unsigned long chunk)
|
|
{
|
|
if (file_page_index(bitmap, chunk) >= bitmap->file_pages)
|
|
return NULL;
|
|
return bitmap->filemap[file_page_index(bitmap, chunk)
|
|
- file_page_index(bitmap, 0)];
|
|
}
|
|
|
|
static void bitmap_file_unmap(struct bitmap *bitmap)
|
|
{
|
|
struct page **map, *sb_page;
|
|
unsigned long *attr;
|
|
int pages;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
map = bitmap->filemap;
|
|
bitmap->filemap = NULL;
|
|
attr = bitmap->filemap_attr;
|
|
bitmap->filemap_attr = NULL;
|
|
pages = bitmap->file_pages;
|
|
bitmap->file_pages = 0;
|
|
sb_page = bitmap->sb_page;
|
|
bitmap->sb_page = NULL;
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
|
|
while (pages--)
|
|
if (map[pages] != sb_page) /* 0 is sb_page, release it below */
|
|
free_buffers(map[pages]);
|
|
kfree(map);
|
|
kfree(attr);
|
|
|
|
if (sb_page)
|
|
free_buffers(sb_page);
|
|
}
|
|
|
|
static void bitmap_file_put(struct bitmap *bitmap)
|
|
{
|
|
struct file *file;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
file = bitmap->file;
|
|
bitmap->file = NULL;
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
|
|
if (file)
|
|
wait_event(bitmap->write_wait,
|
|
atomic_read(&bitmap->pending_writes)==0);
|
|
bitmap_file_unmap(bitmap);
|
|
|
|
if (file) {
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
invalidate_mapping_pages(inode->i_mapping, 0, -1);
|
|
fput(file);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* bitmap_file_kick - if an error occurs while manipulating the bitmap file
|
|
* then it is no longer reliable, so we stop using it and we mark the file
|
|
* as failed in the superblock
|
|
*/
|
|
static void bitmap_file_kick(struct bitmap *bitmap)
|
|
{
|
|
char *path, *ptr = NULL;
|
|
|
|
if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) {
|
|
bitmap_update_sb(bitmap);
|
|
|
|
if (bitmap->file) {
|
|
path = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (path)
|
|
ptr = d_path(&bitmap->file->f_path, path,
|
|
PAGE_SIZE);
|
|
|
|
printk(KERN_ALERT
|
|
"%s: kicking failed bitmap file %s from array!\n",
|
|
bmname(bitmap), IS_ERR(ptr) ? "" : ptr);
|
|
|
|
kfree(path);
|
|
} else
|
|
printk(KERN_ALERT
|
|
"%s: disabling internal bitmap due to errors\n",
|
|
bmname(bitmap));
|
|
}
|
|
|
|
bitmap_file_put(bitmap);
|
|
|
|
return;
|
|
}
|
|
|
|
enum bitmap_page_attr {
|
|
BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */
|
|
BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned.
|
|
* i.e. counter is 1 or 2. */
|
|
BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */
|
|
};
|
|
|
|
static inline void set_page_attr(struct bitmap *bitmap, struct page *page,
|
|
enum bitmap_page_attr attr)
|
|
{
|
|
__set_bit((page->index<<2) + attr, bitmap->filemap_attr);
|
|
}
|
|
|
|
static inline void clear_page_attr(struct bitmap *bitmap, struct page *page,
|
|
enum bitmap_page_attr attr)
|
|
{
|
|
__clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
|
|
}
|
|
|
|
static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page,
|
|
enum bitmap_page_attr attr)
|
|
{
|
|
return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
|
|
}
|
|
|
|
/*
|
|
* bitmap_file_set_bit -- called before performing a write to the md device
|
|
* to set (and eventually sync) a particular bit in the bitmap file
|
|
*
|
|
* we set the bit immediately, then we record the page number so that
|
|
* when an unplug occurs, we can flush the dirty pages out to disk
|
|
*/
|
|
static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
|
|
{
|
|
unsigned long bit;
|
|
struct page *page;
|
|
void *kaddr;
|
|
unsigned long chunk = block >> bitmap->chunkshift;
|
|
|
|
if (!bitmap->filemap)
|
|
return;
|
|
|
|
page = filemap_get_page(bitmap, chunk);
|
|
if (!page)
|
|
return;
|
|
bit = file_page_offset(bitmap, chunk);
|
|
|
|
/* set the bit */
|
|
kaddr = kmap_atomic(page);
|
|
if (bitmap->flags & BITMAP_HOSTENDIAN)
|
|
set_bit(bit, kaddr);
|
|
else
|
|
__set_bit_le(bit, kaddr);
|
|
kunmap_atomic(kaddr);
|
|
pr_debug("set file bit %lu page %lu\n", bit, page->index);
|
|
/* record page number so it gets flushed to disk when unplug occurs */
|
|
set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
|
|
}
|
|
|
|
/* this gets called when the md device is ready to unplug its underlying
|
|
* (slave) device queues -- before we let any writes go down, we need to
|
|
* sync the dirty pages of the bitmap file to disk */
|
|
void bitmap_unplug(struct bitmap *bitmap)
|
|
{
|
|
unsigned long i, flags;
|
|
int dirty, need_write;
|
|
struct page *page;
|
|
int wait = 0;
|
|
|
|
if (!bitmap)
|
|
return;
|
|
|
|
/* look at each page to see if there are any set bits that need to be
|
|
* flushed out to disk */
|
|
for (i = 0; i < bitmap->file_pages; i++) {
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
if (!bitmap->filemap) {
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
return;
|
|
}
|
|
page = bitmap->filemap[i];
|
|
dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
|
|
need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
|
|
clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
|
|
clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
|
|
if (dirty)
|
|
wait = 1;
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
|
|
if (dirty || need_write)
|
|
write_page(bitmap, page, 0);
|
|
}
|
|
if (wait) { /* if any writes were performed, we need to wait on them */
|
|
if (bitmap->file)
|
|
wait_event(bitmap->write_wait,
|
|
atomic_read(&bitmap->pending_writes)==0);
|
|
else
|
|
md_super_wait(bitmap->mddev);
|
|
}
|
|
if (bitmap->flags & BITMAP_WRITE_ERROR)
|
|
bitmap_file_kick(bitmap);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_unplug);
|
|
|
|
static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
|
|
/* * bitmap_init_from_disk -- called at bitmap_create time to initialize
|
|
* the in-memory bitmap from the on-disk bitmap -- also, sets up the
|
|
* memory mapping of the bitmap file
|
|
* Special cases:
|
|
* if there's no bitmap file, or if the bitmap file had been
|
|
* previously kicked from the array, we mark all the bits as
|
|
* 1's in order to cause a full resync.
|
|
*
|
|
* We ignore all bits for sectors that end earlier than 'start'.
|
|
* This is used when reading an out-of-date bitmap...
|
|
*/
|
|
static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
|
|
{
|
|
unsigned long i, chunks, index, oldindex, bit;
|
|
struct page *page = NULL, *oldpage = NULL;
|
|
unsigned long num_pages, bit_cnt = 0;
|
|
struct file *file;
|
|
unsigned long bytes, offset;
|
|
int outofdate;
|
|
int ret = -ENOSPC;
|
|
void *paddr;
|
|
|
|
chunks = bitmap->chunks;
|
|
file = bitmap->file;
|
|
|
|
BUG_ON(!file && !bitmap->mddev->bitmap_info.offset);
|
|
|
|
outofdate = bitmap->flags & BITMAP_STALE;
|
|
if (outofdate)
|
|
printk(KERN_INFO "%s: bitmap file is out of date, doing full "
|
|
"recovery\n", bmname(bitmap));
|
|
|
|
bytes = DIV_ROUND_UP(bitmap->chunks, 8);
|
|
if (!bitmap->mddev->bitmap_info.external)
|
|
bytes += sizeof(bitmap_super_t);
|
|
|
|
num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
|
|
|
|
if (file && i_size_read(file->f_mapping->host) < bytes) {
|
|
printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n",
|
|
bmname(bitmap),
|
|
(unsigned long) i_size_read(file->f_mapping->host),
|
|
bytes);
|
|
goto err;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
|
|
bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
|
|
if (!bitmap->filemap)
|
|
goto err;
|
|
|
|
/* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */
|
|
bitmap->filemap_attr = kzalloc(
|
|
roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
|
|
GFP_KERNEL);
|
|
if (!bitmap->filemap_attr)
|
|
goto err;
|
|
|
|
oldindex = ~0L;
|
|
|
|
for (i = 0; i < chunks; i++) {
|
|
int b;
|
|
index = file_page_index(bitmap, i);
|
|
bit = file_page_offset(bitmap, i);
|
|
if (index != oldindex) { /* this is a new page, read it in */
|
|
int count;
|
|
/* unmap the old page, we're done with it */
|
|
if (index == num_pages-1)
|
|
count = bytes - index * PAGE_SIZE;
|
|
else
|
|
count = PAGE_SIZE;
|
|
if (index == 0 && bitmap->sb_page) {
|
|
/*
|
|
* if we're here then the superblock page
|
|
* contains some bits (PAGE_SIZE != sizeof sb)
|
|
* we've already read it in, so just use it
|
|
*/
|
|
page = bitmap->sb_page;
|
|
offset = sizeof(bitmap_super_t);
|
|
if (!file)
|
|
page = read_sb_page(
|
|
bitmap->mddev,
|
|
bitmap->mddev->bitmap_info.offset,
|
|
page,
|
|
index, count);
|
|
} else if (file) {
|
|
page = read_page(file, index, bitmap, count);
|
|
offset = 0;
|
|
} else {
|
|
page = read_sb_page(bitmap->mddev,
|
|
bitmap->mddev->bitmap_info.offset,
|
|
NULL,
|
|
index, count);
|
|
offset = 0;
|
|
}
|
|
if (IS_ERR(page)) { /* read error */
|
|
ret = PTR_ERR(page);
|
|
goto err;
|
|
}
|
|
|
|
oldindex = index;
|
|
oldpage = page;
|
|
|
|
bitmap->filemap[bitmap->file_pages++] = page;
|
|
bitmap->last_page_size = count;
|
|
|
|
if (outofdate) {
|
|
/*
|
|
* if bitmap is out of date, dirty the
|
|
* whole page and write it out
|
|
*/
|
|
paddr = kmap_atomic(page);
|
|
memset(paddr + offset, 0xff,
|
|
PAGE_SIZE - offset);
|
|
kunmap_atomic(paddr);
|
|
write_page(bitmap, page, 1);
|
|
|
|
ret = -EIO;
|
|
if (bitmap->flags & BITMAP_WRITE_ERROR)
|
|
goto err;
|
|
}
|
|
}
|
|
paddr = kmap_atomic(page);
|
|
if (bitmap->flags & BITMAP_HOSTENDIAN)
|
|
b = test_bit(bit, paddr);
|
|
else
|
|
b = test_bit_le(bit, paddr);
|
|
kunmap_atomic(paddr);
|
|
if (b) {
|
|
/* if the disk bit is set, set the memory bit */
|
|
int needed = ((sector_t)(i+1) << bitmap->chunkshift
|
|
>= start);
|
|
bitmap_set_memory_bits(bitmap,
|
|
(sector_t)i << bitmap->chunkshift,
|
|
needed);
|
|
bit_cnt++;
|
|
}
|
|
}
|
|
|
|
/* everything went OK */
|
|
ret = 0;
|
|
bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET);
|
|
|
|
if (bit_cnt) { /* Kick recovery if any bits were set */
|
|
set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
|
|
md_wakeup_thread(bitmap->mddev->thread);
|
|
}
|
|
|
|
printk(KERN_INFO "%s: bitmap initialized from disk: "
|
|
"read %lu/%lu pages, set %lu of %lu bits\n",
|
|
bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, chunks);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
printk(KERN_INFO "%s: bitmap initialisation failed: %d\n",
|
|
bmname(bitmap), ret);
|
|
return ret;
|
|
}
|
|
|
|
void bitmap_write_all(struct bitmap *bitmap)
|
|
{
|
|
/* We don't actually write all bitmap blocks here,
|
|
* just flag them as needing to be written
|
|
*/
|
|
int i;
|
|
|
|
spin_lock_irq(&bitmap->lock);
|
|
for (i = 0; i < bitmap->file_pages; i++)
|
|
set_page_attr(bitmap, bitmap->filemap[i],
|
|
BITMAP_PAGE_NEEDWRITE);
|
|
bitmap->allclean = 0;
|
|
spin_unlock_irq(&bitmap->lock);
|
|
}
|
|
|
|
static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc)
|
|
{
|
|
sector_t chunk = offset >> bitmap->chunkshift;
|
|
unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
|
|
bitmap->bp[page].count += inc;
|
|
bitmap_checkfree(bitmap, page);
|
|
}
|
|
static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap,
|
|
sector_t offset, sector_t *blocks,
|
|
int create);
|
|
|
|
/*
|
|
* bitmap daemon -- periodically wakes up to clean bits and flush pages
|
|
* out to disk
|
|
*/
|
|
|
|
void bitmap_daemon_work(struct mddev *mddev)
|
|
{
|
|
struct bitmap *bitmap;
|
|
unsigned long j;
|
|
unsigned long flags;
|
|
struct page *page = NULL, *lastpage = NULL;
|
|
sector_t blocks;
|
|
void *paddr;
|
|
|
|
/* Use a mutex to guard daemon_work against
|
|
* bitmap_destroy.
|
|
*/
|
|
mutex_lock(&mddev->bitmap_info.mutex);
|
|
bitmap = mddev->bitmap;
|
|
if (bitmap == NULL) {
|
|
mutex_unlock(&mddev->bitmap_info.mutex);
|
|
return;
|
|
}
|
|
if (time_before(jiffies, bitmap->daemon_lastrun
|
|
+ mddev->bitmap_info.daemon_sleep))
|
|
goto done;
|
|
|
|
bitmap->daemon_lastrun = jiffies;
|
|
if (bitmap->allclean) {
|
|
mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
|
|
goto done;
|
|
}
|
|
bitmap->allclean = 1;
|
|
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
for (j = 0; j < bitmap->chunks; j++) {
|
|
bitmap_counter_t *bmc;
|
|
if (!bitmap->filemap)
|
|
/* error or shutdown */
|
|
break;
|
|
|
|
page = filemap_get_page(bitmap, j);
|
|
|
|
if (page != lastpage) {
|
|
/* skip this page unless it's marked as needing cleaning */
|
|
if (!test_page_attr(bitmap, page, BITMAP_PAGE_PENDING)) {
|
|
int need_write = test_page_attr(bitmap, page,
|
|
BITMAP_PAGE_NEEDWRITE);
|
|
if (need_write)
|
|
clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
|
|
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
if (need_write)
|
|
write_page(bitmap, page, 0);
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
j |= (PAGE_BITS - 1);
|
|
continue;
|
|
}
|
|
|
|
/* grab the new page, sync and release the old */
|
|
if (lastpage != NULL) {
|
|
if (test_page_attr(bitmap, lastpage,
|
|
BITMAP_PAGE_NEEDWRITE)) {
|
|
clear_page_attr(bitmap, lastpage,
|
|
BITMAP_PAGE_NEEDWRITE);
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
write_page(bitmap, lastpage, 0);
|
|
} else {
|
|
set_page_attr(bitmap, lastpage,
|
|
BITMAP_PAGE_NEEDWRITE);
|
|
bitmap->allclean = 0;
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
}
|
|
} else
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
lastpage = page;
|
|
|
|
/* We are possibly going to clear some bits, so make
|
|
* sure that events_cleared is up-to-date.
|
|
*/
|
|
if (bitmap->need_sync &&
|
|
mddev->bitmap_info.external == 0) {
|
|
bitmap_super_t *sb;
|
|
bitmap->need_sync = 0;
|
|
sb = kmap_atomic(bitmap->sb_page);
|
|
sb->events_cleared =
|
|
cpu_to_le64(bitmap->events_cleared);
|
|
kunmap_atomic(sb);
|
|
write_page(bitmap, bitmap->sb_page, 1);
|
|
}
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
if (!bitmap->need_sync)
|
|
clear_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
|
|
else
|
|
bitmap->allclean = 0;
|
|
}
|
|
bmc = bitmap_get_counter(bitmap,
|
|
(sector_t)j << bitmap->chunkshift,
|
|
&blocks, 0);
|
|
if (!bmc)
|
|
j |= PAGE_COUNTER_MASK;
|
|
else if (*bmc) {
|
|
if (*bmc == 1 && !bitmap->need_sync) {
|
|
/* we can clear the bit */
|
|
*bmc = 0;
|
|
bitmap_count_page(bitmap,
|
|
(sector_t)j << bitmap->chunkshift,
|
|
-1);
|
|
|
|
/* clear the bit */
|
|
paddr = kmap_atomic(page);
|
|
if (bitmap->flags & BITMAP_HOSTENDIAN)
|
|
clear_bit(file_page_offset(bitmap, j),
|
|
paddr);
|
|
else
|
|
__clear_bit_le(
|
|
file_page_offset(bitmap,
|
|
j),
|
|
paddr);
|
|
kunmap_atomic(paddr);
|
|
} else if (*bmc <= 2) {
|
|
*bmc = 1; /* maybe clear the bit next time */
|
|
set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
|
|
bitmap->allclean = 0;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
|
|
/* now sync the final page */
|
|
if (lastpage != NULL) {
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) {
|
|
clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
write_page(bitmap, lastpage, 0);
|
|
} else {
|
|
set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
|
|
bitmap->allclean = 0;
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
}
|
|
}
|
|
|
|
done:
|
|
if (bitmap->allclean == 0)
|
|
mddev->thread->timeout =
|
|
mddev->bitmap_info.daemon_sleep;
|
|
mutex_unlock(&mddev->bitmap_info.mutex);
|
|
}
|
|
|
|
static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap,
|
|
sector_t offset, sector_t *blocks,
|
|
int create)
|
|
__releases(bitmap->lock)
|
|
__acquires(bitmap->lock)
|
|
{
|
|
/* If 'create', we might release the lock and reclaim it.
|
|
* The lock must have been taken with interrupts enabled.
|
|
* If !create, we don't release the lock.
|
|
*/
|
|
sector_t chunk = offset >> bitmap->chunkshift;
|
|
unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
|
|
unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT;
|
|
sector_t csize;
|
|
int err;
|
|
|
|
err = bitmap_checkpage(bitmap, page, create);
|
|
|
|
if (bitmap->bp[page].hijacked ||
|
|
bitmap->bp[page].map == NULL)
|
|
csize = ((sector_t)1) << (bitmap->chunkshift +
|
|
PAGE_COUNTER_SHIFT - 1);
|
|
else
|
|
csize = ((sector_t)1) << bitmap->chunkshift;
|
|
*blocks = csize - (offset & (csize - 1));
|
|
|
|
if (err < 0)
|
|
return NULL;
|
|
|
|
/* now locked ... */
|
|
|
|
if (bitmap->bp[page].hijacked) { /* hijacked pointer */
|
|
/* should we use the first or second counter field
|
|
* of the hijacked pointer? */
|
|
int hi = (pageoff > PAGE_COUNTER_MASK);
|
|
return &((bitmap_counter_t *)
|
|
&bitmap->bp[page].map)[hi];
|
|
} else /* page is allocated */
|
|
return (bitmap_counter_t *)
|
|
&(bitmap->bp[page].map[pageoff]);
|
|
}
|
|
|
|
int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind)
|
|
{
|
|
if (!bitmap)
|
|
return 0;
|
|
|
|
if (behind) {
|
|
int bw;
|
|
atomic_inc(&bitmap->behind_writes);
|
|
bw = atomic_read(&bitmap->behind_writes);
|
|
if (bw > bitmap->behind_writes_used)
|
|
bitmap->behind_writes_used = bw;
|
|
|
|
pr_debug("inc write-behind count %d/%lu\n",
|
|
bw, bitmap->mddev->bitmap_info.max_write_behind);
|
|
}
|
|
|
|
while (sectors) {
|
|
sector_t blocks;
|
|
bitmap_counter_t *bmc;
|
|
|
|
spin_lock_irq(&bitmap->lock);
|
|
bmc = bitmap_get_counter(bitmap, offset, &blocks, 1);
|
|
if (!bmc) {
|
|
spin_unlock_irq(&bitmap->lock);
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) {
|
|
DEFINE_WAIT(__wait);
|
|
/* note that it is safe to do the prepare_to_wait
|
|
* after the test as long as we do it before dropping
|
|
* the spinlock.
|
|
*/
|
|
prepare_to_wait(&bitmap->overflow_wait, &__wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
spin_unlock_irq(&bitmap->lock);
|
|
io_schedule();
|
|
finish_wait(&bitmap->overflow_wait, &__wait);
|
|
continue;
|
|
}
|
|
|
|
switch (*bmc) {
|
|
case 0:
|
|
bitmap_file_set_bit(bitmap, offset);
|
|
bitmap_count_page(bitmap, offset, 1);
|
|
/* fall through */
|
|
case 1:
|
|
*bmc = 2;
|
|
}
|
|
|
|
(*bmc)++;
|
|
|
|
spin_unlock_irq(&bitmap->lock);
|
|
|
|
offset += blocks;
|
|
if (sectors > blocks)
|
|
sectors -= blocks;
|
|
else
|
|
sectors = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bitmap_startwrite);
|
|
|
|
void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors,
|
|
int success, int behind)
|
|
{
|
|
if (!bitmap)
|
|
return;
|
|
if (behind) {
|
|
if (atomic_dec_and_test(&bitmap->behind_writes))
|
|
wake_up(&bitmap->behind_wait);
|
|
pr_debug("dec write-behind count %d/%lu\n",
|
|
atomic_read(&bitmap->behind_writes),
|
|
bitmap->mddev->bitmap_info.max_write_behind);
|
|
}
|
|
|
|
while (sectors) {
|
|
sector_t blocks;
|
|
unsigned long flags;
|
|
bitmap_counter_t *bmc;
|
|
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
bmc = bitmap_get_counter(bitmap, offset, &blocks, 0);
|
|
if (!bmc) {
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
return;
|
|
}
|
|
|
|
if (success && !bitmap->mddev->degraded &&
|
|
bitmap->events_cleared < bitmap->mddev->events) {
|
|
bitmap->events_cleared = bitmap->mddev->events;
|
|
bitmap->need_sync = 1;
|
|
sysfs_notify_dirent_safe(bitmap->sysfs_can_clear);
|
|
}
|
|
|
|
if (!success && !NEEDED(*bmc))
|
|
*bmc |= NEEDED_MASK;
|
|
|
|
if (COUNTER(*bmc) == COUNTER_MAX)
|
|
wake_up(&bitmap->overflow_wait);
|
|
|
|
(*bmc)--;
|
|
if (*bmc <= 2) {
|
|
set_page_attr(bitmap,
|
|
filemap_get_page(
|
|
bitmap,
|
|
offset >> bitmap->chunkshift),
|
|
BITMAP_PAGE_PENDING);
|
|
bitmap->allclean = 0;
|
|
}
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
offset += blocks;
|
|
if (sectors > blocks)
|
|
sectors -= blocks;
|
|
else
|
|
sectors = 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(bitmap_endwrite);
|
|
|
|
static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
|
|
int degraded)
|
|
{
|
|
bitmap_counter_t *bmc;
|
|
int rv;
|
|
if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */
|
|
*blocks = 1024;
|
|
return 1; /* always resync if no bitmap */
|
|
}
|
|
spin_lock_irq(&bitmap->lock);
|
|
bmc = bitmap_get_counter(bitmap, offset, blocks, 0);
|
|
rv = 0;
|
|
if (bmc) {
|
|
/* locked */
|
|
if (RESYNC(*bmc))
|
|
rv = 1;
|
|
else if (NEEDED(*bmc)) {
|
|
rv = 1;
|
|
if (!degraded) { /* don't set/clear bits if degraded */
|
|
*bmc |= RESYNC_MASK;
|
|
*bmc &= ~NEEDED_MASK;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irq(&bitmap->lock);
|
|
return rv;
|
|
}
|
|
|
|
int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
|
|
int degraded)
|
|
{
|
|
/* bitmap_start_sync must always report on multiples of whole
|
|
* pages, otherwise resync (which is very PAGE_SIZE based) will
|
|
* get confused.
|
|
* So call __bitmap_start_sync repeatedly (if needed) until
|
|
* At least PAGE_SIZE>>9 blocks are covered.
|
|
* Return the 'or' of the result.
|
|
*/
|
|
int rv = 0;
|
|
sector_t blocks1;
|
|
|
|
*blocks = 0;
|
|
while (*blocks < (PAGE_SIZE>>9)) {
|
|
rv |= __bitmap_start_sync(bitmap, offset,
|
|
&blocks1, degraded);
|
|
offset += blocks1;
|
|
*blocks += blocks1;
|
|
}
|
|
return rv;
|
|
}
|
|
EXPORT_SYMBOL(bitmap_start_sync);
|
|
|
|
void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted)
|
|
{
|
|
bitmap_counter_t *bmc;
|
|
unsigned long flags;
|
|
|
|
if (bitmap == NULL) {
|
|
*blocks = 1024;
|
|
return;
|
|
}
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
bmc = bitmap_get_counter(bitmap, offset, blocks, 0);
|
|
if (bmc == NULL)
|
|
goto unlock;
|
|
/* locked */
|
|
if (RESYNC(*bmc)) {
|
|
*bmc &= ~RESYNC_MASK;
|
|
|
|
if (!NEEDED(*bmc) && aborted)
|
|
*bmc |= NEEDED_MASK;
|
|
else {
|
|
if (*bmc <= 2) {
|
|
set_page_attr(bitmap,
|
|
filemap_get_page(bitmap, offset >> bitmap->chunkshift),
|
|
BITMAP_PAGE_PENDING);
|
|
bitmap->allclean = 0;
|
|
}
|
|
}
|
|
}
|
|
unlock:
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_end_sync);
|
|
|
|
void bitmap_close_sync(struct bitmap *bitmap)
|
|
{
|
|
/* Sync has finished, and any bitmap chunks that weren't synced
|
|
* properly have been aborted. It remains to us to clear the
|
|
* RESYNC bit wherever it is still on
|
|
*/
|
|
sector_t sector = 0;
|
|
sector_t blocks;
|
|
if (!bitmap)
|
|
return;
|
|
while (sector < bitmap->mddev->resync_max_sectors) {
|
|
bitmap_end_sync(bitmap, sector, &blocks, 0);
|
|
sector += blocks;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(bitmap_close_sync);
|
|
|
|
void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector)
|
|
{
|
|
sector_t s = 0;
|
|
sector_t blocks;
|
|
|
|
if (!bitmap)
|
|
return;
|
|
if (sector == 0) {
|
|
bitmap->last_end_sync = jiffies;
|
|
return;
|
|
}
|
|
if (time_before(jiffies, (bitmap->last_end_sync
|
|
+ bitmap->mddev->bitmap_info.daemon_sleep)))
|
|
return;
|
|
wait_event(bitmap->mddev->recovery_wait,
|
|
atomic_read(&bitmap->mddev->recovery_active) == 0);
|
|
|
|
bitmap->mddev->curr_resync_completed = sector;
|
|
set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags);
|
|
sector &= ~((1ULL << bitmap->chunkshift) - 1);
|
|
s = 0;
|
|
while (s < sector && s < bitmap->mddev->resync_max_sectors) {
|
|
bitmap_end_sync(bitmap, s, &blocks, 0);
|
|
s += blocks;
|
|
}
|
|
bitmap->last_end_sync = jiffies;
|
|
sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed");
|
|
}
|
|
EXPORT_SYMBOL(bitmap_cond_end_sync);
|
|
|
|
static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
|
|
{
|
|
/* For each chunk covered by any of these sectors, set the
|
|
* counter to 1 and set resync_needed. They should all
|
|
* be 0 at this point
|
|
*/
|
|
|
|
sector_t secs;
|
|
bitmap_counter_t *bmc;
|
|
spin_lock_irq(&bitmap->lock);
|
|
bmc = bitmap_get_counter(bitmap, offset, &secs, 1);
|
|
if (!bmc) {
|
|
spin_unlock_irq(&bitmap->lock);
|
|
return;
|
|
}
|
|
if (!*bmc) {
|
|
struct page *page;
|
|
*bmc = 2 | (needed ? NEEDED_MASK : 0);
|
|
bitmap_count_page(bitmap, offset, 1);
|
|
page = filemap_get_page(bitmap, offset >> bitmap->chunkshift);
|
|
set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
|
|
bitmap->allclean = 0;
|
|
}
|
|
spin_unlock_irq(&bitmap->lock);
|
|
}
|
|
|
|
/* dirty the memory and file bits for bitmap chunks "s" to "e" */
|
|
void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
|
|
{
|
|
unsigned long chunk;
|
|
|
|
for (chunk = s; chunk <= e; chunk++) {
|
|
sector_t sec = (sector_t)chunk << bitmap->chunkshift;
|
|
bitmap_set_memory_bits(bitmap, sec, 1);
|
|
spin_lock_irq(&bitmap->lock);
|
|
bitmap_file_set_bit(bitmap, sec);
|
|
spin_unlock_irq(&bitmap->lock);
|
|
if (sec < bitmap->mddev->recovery_cp)
|
|
/* We are asserting that the array is dirty,
|
|
* so move the recovery_cp address back so
|
|
* that it is obvious that it is dirty
|
|
*/
|
|
bitmap->mddev->recovery_cp = sec;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* flush out any pending updates
|
|
*/
|
|
void bitmap_flush(struct mddev *mddev)
|
|
{
|
|
struct bitmap *bitmap = mddev->bitmap;
|
|
long sleep;
|
|
|
|
if (!bitmap) /* there was no bitmap */
|
|
return;
|
|
|
|
/* run the daemon_work three time to ensure everything is flushed
|
|
* that can be
|
|
*/
|
|
sleep = mddev->bitmap_info.daemon_sleep * 2;
|
|
bitmap->daemon_lastrun -= sleep;
|
|
bitmap_daemon_work(mddev);
|
|
bitmap->daemon_lastrun -= sleep;
|
|
bitmap_daemon_work(mddev);
|
|
bitmap->daemon_lastrun -= sleep;
|
|
bitmap_daemon_work(mddev);
|
|
bitmap_update_sb(bitmap);
|
|
}
|
|
|
|
/*
|
|
* free memory that was allocated
|
|
*/
|
|
static void bitmap_free(struct bitmap *bitmap)
|
|
{
|
|
unsigned long k, pages;
|
|
struct bitmap_page *bp;
|
|
|
|
if (!bitmap) /* there was no bitmap */
|
|
return;
|
|
|
|
/* release the bitmap file and kill the daemon */
|
|
bitmap_file_put(bitmap);
|
|
|
|
bp = bitmap->bp;
|
|
pages = bitmap->pages;
|
|
|
|
/* free all allocated memory */
|
|
|
|
if (bp) /* deallocate the page memory */
|
|
for (k = 0; k < pages; k++)
|
|
if (bp[k].map && !bp[k].hijacked)
|
|
kfree(bp[k].map);
|
|
kfree(bp);
|
|
kfree(bitmap);
|
|
}
|
|
|
|
void bitmap_destroy(struct mddev *mddev)
|
|
{
|
|
struct bitmap *bitmap = mddev->bitmap;
|
|
|
|
if (!bitmap) /* there was no bitmap */
|
|
return;
|
|
|
|
mutex_lock(&mddev->bitmap_info.mutex);
|
|
mddev->bitmap = NULL; /* disconnect from the md device */
|
|
mutex_unlock(&mddev->bitmap_info.mutex);
|
|
if (mddev->thread)
|
|
mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
|
|
|
|
if (bitmap->sysfs_can_clear)
|
|
sysfs_put(bitmap->sysfs_can_clear);
|
|
|
|
bitmap_free(bitmap);
|
|
}
|
|
|
|
/*
|
|
* initialize the bitmap structure
|
|
* if this returns an error, bitmap_destroy must be called to do clean up
|
|
*/
|
|
int bitmap_create(struct mddev *mddev)
|
|
{
|
|
struct bitmap *bitmap;
|
|
sector_t blocks = mddev->resync_max_sectors;
|
|
unsigned long chunks;
|
|
unsigned long pages;
|
|
struct file *file = mddev->bitmap_info.file;
|
|
int err;
|
|
struct sysfs_dirent *bm = NULL;
|
|
|
|
BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
|
|
|
|
if (!file
|
|
&& !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */
|
|
return 0;
|
|
|
|
BUG_ON(file && mddev->bitmap_info.offset);
|
|
|
|
bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
|
|
if (!bitmap)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&bitmap->lock);
|
|
atomic_set(&bitmap->pending_writes, 0);
|
|
init_waitqueue_head(&bitmap->write_wait);
|
|
init_waitqueue_head(&bitmap->overflow_wait);
|
|
init_waitqueue_head(&bitmap->behind_wait);
|
|
|
|
bitmap->mddev = mddev;
|
|
|
|
if (mddev->kobj.sd)
|
|
bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap");
|
|
if (bm) {
|
|
bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear");
|
|
sysfs_put(bm);
|
|
} else
|
|
bitmap->sysfs_can_clear = NULL;
|
|
|
|
bitmap->file = file;
|
|
if (file) {
|
|
get_file(file);
|
|
/* As future accesses to this file will use bmap,
|
|
* and bypass the page cache, we must sync the file
|
|
* first.
|
|
*/
|
|
vfs_fsync(file, 1);
|
|
}
|
|
/* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */
|
|
if (!mddev->bitmap_info.external) {
|
|
/*
|
|
* If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is
|
|
* instructing us to create a new on-disk bitmap instance.
|
|
*/
|
|
if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags))
|
|
err = bitmap_new_disk_sb(bitmap);
|
|
else
|
|
err = bitmap_read_sb(bitmap);
|
|
} else {
|
|
err = 0;
|
|
if (mddev->bitmap_info.chunksize == 0 ||
|
|
mddev->bitmap_info.daemon_sleep == 0)
|
|
/* chunksize and time_base need to be
|
|
* set first. */
|
|
err = -EINVAL;
|
|
}
|
|
if (err)
|
|
goto error;
|
|
|
|
bitmap->daemon_lastrun = jiffies;
|
|
bitmap->chunkshift = (ffz(~mddev->bitmap_info.chunksize)
|
|
- BITMAP_BLOCK_SHIFT);
|
|
|
|
/* now that chunksize and chunkshift are set, we can use these macros */
|
|
chunks = (blocks + bitmap->chunkshift - 1) >>
|
|
bitmap->chunkshift;
|
|
pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO;
|
|
|
|
BUG_ON(!pages);
|
|
|
|
bitmap->chunks = chunks;
|
|
bitmap->pages = pages;
|
|
bitmap->missing_pages = pages;
|
|
|
|
bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL);
|
|
|
|
err = -ENOMEM;
|
|
if (!bitmap->bp)
|
|
goto error;
|
|
|
|
printk(KERN_INFO "created bitmap (%lu pages) for device %s\n",
|
|
pages, bmname(bitmap));
|
|
|
|
mddev->bitmap = bitmap;
|
|
|
|
|
|
return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0;
|
|
|
|
error:
|
|
bitmap_free(bitmap);
|
|
return err;
|
|
}
|
|
|
|
int bitmap_load(struct mddev *mddev)
|
|
{
|
|
int err = 0;
|
|
sector_t start = 0;
|
|
sector_t sector = 0;
|
|
struct bitmap *bitmap = mddev->bitmap;
|
|
|
|
if (!bitmap)
|
|
goto out;
|
|
|
|
/* Clear out old bitmap info first: Either there is none, or we
|
|
* are resuming after someone else has possibly changed things,
|
|
* so we should forget old cached info.
|
|
* All chunks should be clean, but some might need_sync.
|
|
*/
|
|
while (sector < mddev->resync_max_sectors) {
|
|
sector_t blocks;
|
|
bitmap_start_sync(bitmap, sector, &blocks, 0);
|
|
sector += blocks;
|
|
}
|
|
bitmap_close_sync(bitmap);
|
|
|
|
if (mddev->degraded == 0
|
|
|| bitmap->events_cleared == mddev->events)
|
|
/* no need to keep dirty bits to optimise a
|
|
* re-add of a missing device */
|
|
start = mddev->recovery_cp;
|
|
|
|
mutex_lock(&mddev->bitmap_info.mutex);
|
|
err = bitmap_init_from_disk(bitmap, start);
|
|
mutex_unlock(&mddev->bitmap_info.mutex);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;
|
|
md_wakeup_thread(mddev->thread);
|
|
|
|
bitmap_update_sb(bitmap);
|
|
|
|
if (bitmap->flags & BITMAP_WRITE_ERROR)
|
|
err = -EIO;
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bitmap_load);
|
|
|
|
void bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
|
|
{
|
|
unsigned long chunk_kb;
|
|
unsigned long flags;
|
|
|
|
if (!bitmap)
|
|
return;
|
|
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;
|
|
seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
|
|
"%lu%s chunk",
|
|
bitmap->pages - bitmap->missing_pages,
|
|
bitmap->pages,
|
|
(bitmap->pages - bitmap->missing_pages)
|
|
<< (PAGE_SHIFT - 10),
|
|
chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,
|
|
chunk_kb ? "KB" : "B");
|
|
if (bitmap->file) {
|
|
seq_printf(seq, ", file: ");
|
|
seq_path(seq, &bitmap->file->f_path, " \t\n");
|
|
}
|
|
|
|
seq_printf(seq, "\n");
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
}
|
|
|
|
static ssize_t
|
|
location_show(struct mddev *mddev, char *page)
|
|
{
|
|
ssize_t len;
|
|
if (mddev->bitmap_info.file)
|
|
len = sprintf(page, "file");
|
|
else if (mddev->bitmap_info.offset)
|
|
len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset);
|
|
else
|
|
len = sprintf(page, "none");
|
|
len += sprintf(page+len, "\n");
|
|
return len;
|
|
}
|
|
|
|
static ssize_t
|
|
location_store(struct mddev *mddev, const char *buf, size_t len)
|
|
{
|
|
|
|
if (mddev->pers) {
|
|
if (!mddev->pers->quiesce)
|
|
return -EBUSY;
|
|
if (mddev->recovery || mddev->sync_thread)
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (mddev->bitmap || mddev->bitmap_info.file ||
|
|
mddev->bitmap_info.offset) {
|
|
/* bitmap already configured. Only option is to clear it */
|
|
if (strncmp(buf, "none", 4) != 0)
|
|
return -EBUSY;
|
|
if (mddev->pers) {
|
|
mddev->pers->quiesce(mddev, 1);
|
|
bitmap_destroy(mddev);
|
|
mddev->pers->quiesce(mddev, 0);
|
|
}
|
|
mddev->bitmap_info.offset = 0;
|
|
if (mddev->bitmap_info.file) {
|
|
struct file *f = mddev->bitmap_info.file;
|
|
mddev->bitmap_info.file = NULL;
|
|
restore_bitmap_write_access(f);
|
|
fput(f);
|
|
}
|
|
} else {
|
|
/* No bitmap, OK to set a location */
|
|
long long offset;
|
|
if (strncmp(buf, "none", 4) == 0)
|
|
/* nothing to be done */;
|
|
else if (strncmp(buf, "file:", 5) == 0) {
|
|
/* Not supported yet */
|
|
return -EINVAL;
|
|
} else {
|
|
int rv;
|
|
if (buf[0] == '+')
|
|
rv = strict_strtoll(buf+1, 10, &offset);
|
|
else
|
|
rv = strict_strtoll(buf, 10, &offset);
|
|
if (rv)
|
|
return rv;
|
|
if (offset == 0)
|
|
return -EINVAL;
|
|
if (mddev->bitmap_info.external == 0 &&
|
|
mddev->major_version == 0 &&
|
|
offset != mddev->bitmap_info.default_offset)
|
|
return -EINVAL;
|
|
mddev->bitmap_info.offset = offset;
|
|
if (mddev->pers) {
|
|
mddev->pers->quiesce(mddev, 1);
|
|
rv = bitmap_create(mddev);
|
|
if (!rv)
|
|
rv = bitmap_load(mddev);
|
|
if (rv) {
|
|
bitmap_destroy(mddev);
|
|
mddev->bitmap_info.offset = 0;
|
|
}
|
|
mddev->pers->quiesce(mddev, 0);
|
|
if (rv)
|
|
return rv;
|
|
}
|
|
}
|
|
}
|
|
if (!mddev->external) {
|
|
/* Ensure new bitmap info is stored in
|
|
* metadata promptly.
|
|
*/
|
|
set_bit(MD_CHANGE_DEVS, &mddev->flags);
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry bitmap_location =
|
|
__ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store);
|
|
|
|
static ssize_t
|
|
timeout_show(struct mddev *mddev, char *page)
|
|
{
|
|
ssize_t len;
|
|
unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ;
|
|
unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ;
|
|
|
|
len = sprintf(page, "%lu", secs);
|
|
if (jifs)
|
|
len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs));
|
|
len += sprintf(page+len, "\n");
|
|
return len;
|
|
}
|
|
|
|
static ssize_t
|
|
timeout_store(struct mddev *mddev, const char *buf, size_t len)
|
|
{
|
|
/* timeout can be set at any time */
|
|
unsigned long timeout;
|
|
int rv = strict_strtoul_scaled(buf, &timeout, 4);
|
|
if (rv)
|
|
return rv;
|
|
|
|
/* just to make sure we don't overflow... */
|
|
if (timeout >= LONG_MAX / HZ)
|
|
return -EINVAL;
|
|
|
|
timeout = timeout * HZ / 10000;
|
|
|
|
if (timeout >= MAX_SCHEDULE_TIMEOUT)
|
|
timeout = MAX_SCHEDULE_TIMEOUT-1;
|
|
if (timeout < 1)
|
|
timeout = 1;
|
|
mddev->bitmap_info.daemon_sleep = timeout;
|
|
if (mddev->thread) {
|
|
/* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then
|
|
* the bitmap is all clean and we don't need to
|
|
* adjust the timeout right now
|
|
*/
|
|
if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) {
|
|
mddev->thread->timeout = timeout;
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry bitmap_timeout =
|
|
__ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store);
|
|
|
|
static ssize_t
|
|
backlog_show(struct mddev *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind);
|
|
}
|
|
|
|
static ssize_t
|
|
backlog_store(struct mddev *mddev, const char *buf, size_t len)
|
|
{
|
|
unsigned long backlog;
|
|
int rv = strict_strtoul(buf, 10, &backlog);
|
|
if (rv)
|
|
return rv;
|
|
if (backlog > COUNTER_MAX)
|
|
return -EINVAL;
|
|
mddev->bitmap_info.max_write_behind = backlog;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry bitmap_backlog =
|
|
__ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store);
|
|
|
|
static ssize_t
|
|
chunksize_show(struct mddev *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize);
|
|
}
|
|
|
|
static ssize_t
|
|
chunksize_store(struct mddev *mddev, const char *buf, size_t len)
|
|
{
|
|
/* Can only be changed when no bitmap is active */
|
|
int rv;
|
|
unsigned long csize;
|
|
if (mddev->bitmap)
|
|
return -EBUSY;
|
|
rv = strict_strtoul(buf, 10, &csize);
|
|
if (rv)
|
|
return rv;
|
|
if (csize < 512 ||
|
|
!is_power_of_2(csize))
|
|
return -EINVAL;
|
|
mddev->bitmap_info.chunksize = csize;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry bitmap_chunksize =
|
|
__ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store);
|
|
|
|
static ssize_t metadata_show(struct mddev *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%s\n", (mddev->bitmap_info.external
|
|
? "external" : "internal"));
|
|
}
|
|
|
|
static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len)
|
|
{
|
|
if (mddev->bitmap ||
|
|
mddev->bitmap_info.file ||
|
|
mddev->bitmap_info.offset)
|
|
return -EBUSY;
|
|
if (strncmp(buf, "external", 8) == 0)
|
|
mddev->bitmap_info.external = 1;
|
|
else if (strncmp(buf, "internal", 8) == 0)
|
|
mddev->bitmap_info.external = 0;
|
|
else
|
|
return -EINVAL;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry bitmap_metadata =
|
|
__ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
|
|
|
|
static ssize_t can_clear_show(struct mddev *mddev, char *page)
|
|
{
|
|
int len;
|
|
if (mddev->bitmap)
|
|
len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ?
|
|
"false" : "true"));
|
|
else
|
|
len = sprintf(page, "\n");
|
|
return len;
|
|
}
|
|
|
|
static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len)
|
|
{
|
|
if (mddev->bitmap == NULL)
|
|
return -ENOENT;
|
|
if (strncmp(buf, "false", 5) == 0)
|
|
mddev->bitmap->need_sync = 1;
|
|
else if (strncmp(buf, "true", 4) == 0) {
|
|
if (mddev->degraded)
|
|
return -EBUSY;
|
|
mddev->bitmap->need_sync = 0;
|
|
} else
|
|
return -EINVAL;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry bitmap_can_clear =
|
|
__ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store);
|
|
|
|
static ssize_t
|
|
behind_writes_used_show(struct mddev *mddev, char *page)
|
|
{
|
|
if (mddev->bitmap == NULL)
|
|
return sprintf(page, "0\n");
|
|
return sprintf(page, "%lu\n",
|
|
mddev->bitmap->behind_writes_used);
|
|
}
|
|
|
|
static ssize_t
|
|
behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len)
|
|
{
|
|
if (mddev->bitmap)
|
|
mddev->bitmap->behind_writes_used = 0;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry max_backlog_used =
|
|
__ATTR(max_backlog_used, S_IRUGO | S_IWUSR,
|
|
behind_writes_used_show, behind_writes_used_reset);
|
|
|
|
static struct attribute *md_bitmap_attrs[] = {
|
|
&bitmap_location.attr,
|
|
&bitmap_timeout.attr,
|
|
&bitmap_backlog.attr,
|
|
&bitmap_chunksize.attr,
|
|
&bitmap_metadata.attr,
|
|
&bitmap_can_clear.attr,
|
|
&max_backlog_used.attr,
|
|
NULL
|
|
};
|
|
struct attribute_group md_bitmap_group = {
|
|
.name = "bitmap",
|
|
.attrs = md_bitmap_attrs,
|
|
};
|
|
|