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[PATCH] md: don't skip bitmap pages due to lack of bit that we just cleared. 

When looking for pages that need cleaning we skip pages that don't have
BITMAP_PAGE_CLEAN set.  But if it is the 'current' page we will have cleared
that bit ourselves, so skipping it is wrong.  So: move the 'skip this page'
inside 'if page != lastpage'.

Also fold call of file_page_offset into the one place where the value (bit) is
used.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-06-21 17:17:22 -07:00 committed by Linus Torvalds
parent 77ad4bc706
commit aa3163f816
1 changed files with 17 additions and 18 deletions
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35
drivers/md/bitmap.c
View File

@ -897,7 +897,7 @@ static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap,
int bitmap_daemon_work(struct bitmap *bitmap)
{
unsigned long bit, j;
unsigned long j;
unsigned long flags;
struct page *page = NULL, *lastpage = NULL;
int err = 0;
@ -920,24 +920,23 @@ int bitmap_daemon_work(struct bitmap *bitmap)
}
page = filemap_get_page(bitmap, j);
/* skip this page unless it's marked as needing cleaning */
if (!((attr=get_page_attr(bitmap, page)) & BITMAP_PAGE_CLEAN)) {
if (attr & BITMAP_PAGE_NEEDWRITE) {
page_cache_get(page);
clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
}
spin_unlock_irqrestore(&bitmap->lock, flags);
if (attr & BITMAP_PAGE_NEEDWRITE) {
if (write_page(bitmap, page, 0))
bitmap_file_kick(bitmap);
page_cache_release(page);
}
continue;
}
bit = file_page_offset(j);
if (page != lastpage) {
/* skip this page unless it's marked as needing cleaning */
if (!((attr=get_page_attr(bitmap, page)) & BITMAP_PAGE_CLEAN)) {
if (attr & BITMAP_PAGE_NEEDWRITE) {
page_cache_get(page);
clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
}
spin_unlock_irqrestore(&bitmap->lock, flags);
if (attr & BITMAP_PAGE_NEEDWRITE) {
if (write_page(bitmap, page, 0))
bitmap_file_kick(bitmap);
page_cache_release(page);
}
continue;
}
/* grab the new page, sync and release the old */
page_cache_get(page);
if (lastpage != NULL) {
@ -979,7 +978,7 @@ int bitmap_daemon_work(struct bitmap *bitmap)
-1);
/* clear the bit */
clear_bit(bit, page_address(page));
clear_bit(file_page_offset(j), page_address(page));
}
}
spin_unlock_irqrestore(&bitmap->lock, flags);