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authorNeil Brown <neilb@suse.de>2007-08-12 01:03:48 +0200
committerAdrian Bunk <bunk@stusta.de>2007-08-12 01:03:48 +0200
commit65d3f3569815bda6f390244825f046ed8248d3e0 (patch)
treefec6d81d083b5c403570be4dc430c834ab8049d7
parentddd0593c7408afa9dcc29db6a80669761107ee3c (diff)
downloadlinux-linaro-stable-65d3f3569815bda6f390244825f046ed8248d3e0.tar.gz
md/bitmap: cleaner separation of page attribute handlers in md/bitmap
md/bitmap has some attributes per-page. Handling of these attributes in largely abstracted in set_page_attr and clear_page_attr. However get_page_attr exposes the format used to store them. So prior to changing that format, introduce test_page_attr instead of get_page_attr, and make appropriate usage changes. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Adrian Bunk <bunk@kernel.org>
-rw-r--r--drivers/md/bitmap.c41
1 files changed, 22 insertions, 19 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index eae4473eadde..8d65f4fa39b1 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -735,9 +735,10 @@ static inline void clear_page_attr(struct bitmap *bitmap, struct page *page,
bitmap->filemap_attr[page->index] &= ~attr;
}
-static inline unsigned long get_page_attr(struct bitmap *bitmap, struct page *page)
+static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page,
+ enum bitmap_page_attr attr)
{
- return bitmap->filemap_attr[page->index];
+ return bitmap->filemap_attr[page->index] & attr;
}
/*
@@ -763,7 +764,7 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
/* make sure the page stays cached until it gets written out */
- if (! (get_page_attr(bitmap, page) & BITMAP_PAGE_DIRTY))
+ if (! test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY))
get_page(page);
/* set the bit */
@@ -785,7 +786,8 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
* sync the dirty pages of the bitmap file to disk */
int bitmap_unplug(struct bitmap *bitmap)
{
- unsigned long i, attr, flags;
+ unsigned long i, flags;
+ int dirty, need_write;
struct page *page;
int wait = 0;
int err;
@@ -802,17 +804,18 @@ int bitmap_unplug(struct bitmap *bitmap)
return 0;
}
page = bitmap->filemap[i];
- attr = get_page_attr(bitmap, page);
+ 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 ((attr & BITMAP_PAGE_DIRTY))
+ if (dirty)
wait = 1;
spin_unlock_irqrestore(&bitmap->lock, flags);
- if (attr & (BITMAP_PAGE_DIRTY | BITMAP_PAGE_NEEDWRITE)) {
+ if (dirty | need_write) {
err = write_page(bitmap, page, 0);
if (err == -EAGAIN) {
- if (attr & BITMAP_PAGE_DIRTY)
+ if (dirty)
err = write_page(bitmap, page, 1);
else
err = 0;
@@ -981,12 +984,11 @@ 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;
- unsigned long chunks = bitmap->chunks;
- unsigned long bytes = (chunks+7)/8 + sizeof(bitmap_super_t);
- unsigned long num_pages = (bytes + PAGE_SIZE-1) / PAGE_SIZE;
- while (num_pages--)
- bitmap->filemap_attr[num_pages] |= BITMAP_PAGE_NEEDWRITE;
+ for (i=0; i < bitmap->file_pages; i++)
+ set_page_attr(bitmap, bitmap->filemap[i],
+ BITMAP_PAGE_NEEDWRITE);
}
@@ -1017,7 +1019,6 @@ int bitmap_daemon_work(struct bitmap *bitmap)
struct page *page = NULL, *lastpage = NULL;
int err = 0;
int blocks;
- int attr;
void *paddr;
if (bitmap == NULL)
@@ -1039,13 +1040,15 @@ int bitmap_daemon_work(struct bitmap *bitmap)
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) {
+ if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) {
+ int need_write = test_page_attr(bitmap, page,
+ BITMAP_PAGE_NEEDWRITE);
+ if (need_write) {
get_page(page);
clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
}
spin_unlock_irqrestore(&bitmap->lock, flags);
- if (attr & BITMAP_PAGE_NEEDWRITE) {
+ if (need_write) {
switch (write_page(bitmap, page, 0)) {
case -EAGAIN:
set_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
@@ -1063,7 +1066,7 @@ int bitmap_daemon_work(struct bitmap *bitmap)
/* grab the new page, sync and release the old */
get_page(page);
if (lastpage != NULL) {
- if (get_page_attr(bitmap, lastpage) & BITMAP_PAGE_NEEDWRITE) {
+ if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) {
clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
spin_unlock_irqrestore(&bitmap->lock, flags);
err = write_page(bitmap, lastpage, 0);
@@ -1117,7 +1120,7 @@ int bitmap_daemon_work(struct bitmap *bitmap)
/* now sync the final page */
if (lastpage != NULL) {
spin_lock_irqsave(&bitmap->lock, flags);
- if (get_page_attr(bitmap, lastpage) &BITMAP_PAGE_NEEDWRITE) {
+ if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) {
clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
spin_unlock_irqrestore(&bitmap->lock, flags);
err = write_page(bitmap, lastpage, 0);