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MD bitmap: Revert DM dirty log hooks 

Revert most of commit e384e58549
  md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.

MD should not need to use DM's dirty log - we decided to use md's
bitmaps instead.

Keeping the DIV_ROUND_UP clean-ups that were part of commit
e384e58549, however.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Jonathan Brassow 2011-07-27 11:00:37 +10:00 committed by NeilBrown
parent 654e8b5abc
commit 3520fa4db7
3 changed files with 42 additions and 99 deletions
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131
drivers/md/bitmap.c
View File

@ -29,7 +29,6 @@
#include "md.h"
#include "bitmap.h"
#include <linux/dm-dirty-log.h>
/* debug macros */
#define DEBUG 0
@ -775,10 +774,8 @@ static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned lon
* 0 or page 1
*/
static inline struct page *filemap_get_page(struct bitmap *bitmap,
unsigned long chunk)
unsigned long chunk)
{
if (bitmap->filemap == NULL)
return NULL;
if (file_page_index(bitmap, chunk) >= bitmap->file_pages)
return NULL;
return bitmap->filemap[file_page_index(bitmap, chunk)
@ -878,28 +875,19 @@ enum bitmap_page_attr {
static inline void set_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
if (page)
__set_bit((page->index<<2) + attr, bitmap->filemap_attr);
else
__set_bit(attr, &bitmap->logattrs);
__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)
{
if (page)
__clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
else
__clear_bit(attr, &bitmap->logattrs);
__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)
{
if (page)
return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
else
return test_bit(attr, &bitmap->logattrs);
return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
/*
@ -912,30 +900,26 @@ static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *p
static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
{
unsigned long bit;
struct page *page = NULL;
struct page *page;
void *kaddr;
unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap);
if (!bitmap->filemap) {
struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log;
if (log)
log->type->mark_region(log, chunk);
} else {
if (!bitmap->filemap)
return;
page = filemap_get_page(bitmap, chunk);
if (!page)
return;
bit = file_page_offset(bitmap, chunk);
page = filemap_get_page(bitmap, chunk);
if (!page)
return;
bit = file_page_offset(bitmap, chunk);
/* set the bit */
kaddr = kmap_atomic(page, KM_USER0);
if (bitmap->flags & BITMAP_HOSTENDIAN)
set_bit(bit, kaddr);
else
__set_bit_le(bit, kaddr);
kunmap_atomic(kaddr, KM_USER0);
PRINTK("set file bit %lu page %lu\n", bit, page->index);
}
/* set the bit */
kaddr = kmap_atomic(page, KM_USER0);
if (bitmap->flags & BITMAP_HOSTENDIAN)
set_bit(bit, kaddr);
else
__set_bit_le(bit, kaddr);
kunmap_atomic(kaddr, KM_USER0);
PRINTK("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);
}
@ -952,16 +936,6 @@ void bitmap_unplug(struct bitmap *bitmap)
if (!bitmap)
return;
if (!bitmap->filemap) {
/* Must be using a dirty_log */
struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log;
dirty = test_and_clear_bit(BITMAP_PAGE_DIRTY, &bitmap->logattrs);
need_write = test_and_clear_bit(BITMAP_PAGE_NEEDWRITE, &bitmap->logattrs);
if (dirty || need_write)
if (log->type->flush(log))
bitmap->flags |= BITMAP_WRITE_ERROR;
goto out;
}
/* look at each page to see if there are any set bits that need to be
* flushed out to disk */
@ -990,7 +964,6 @@ void bitmap_unplug(struct bitmap *bitmap)
else
md_super_wait(bitmap->mddev);
}
out:
if (bitmap->flags & BITMAP_WRITE_ERROR)
bitmap_file_kick(bitmap);
}
@ -1199,7 +1172,6 @@ void bitmap_daemon_work(mddev_t *mddev)
struct page *page = NULL, *lastpage = NULL;
sector_t blocks;
void *paddr;
struct dm_dirty_log *log = mddev->bitmap_info.log;
/* Use a mutex to guard daemon_work against
* bitmap_destroy.
@ -1224,12 +1196,11 @@ void bitmap_daemon_work(mddev_t *mddev)
spin_lock_irqsave(&bitmap->lock, flags);
for (j = 0; j < bitmap->chunks; j++) {
bitmap_counter_t *bmc;
if (!bitmap->filemap) {
if (!log)
/* error or shutdown */
break;
} else
page = filemap_get_page(bitmap, j);
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 */
@ -1298,19 +1269,16 @@ void bitmap_daemon_work(mddev_t *mddev)
-1);
/* clear the bit */
if (page) {
paddr = kmap_atomic(page, KM_USER0);
if (bitmap->flags & BITMAP_HOSTENDIAN)
clear_bit(file_page_offset(bitmap, j),
paddr);
else
__clear_bit_le(
paddr = kmap_atomic(page, KM_USER0);
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, KM_USER0);
} else
log->type->clear_region(log, j);
kunmap_atomic(paddr, KM_USER0);
}
} else
j |= PAGE_COUNTER_MASK;
@ -1318,16 +1286,12 @@ void bitmap_daemon_work(mddev_t *mddev)
spin_unlock_irqrestore(&bitmap->lock, flags);
/* now sync the final page */
if (lastpage != NULL || log != NULL) {
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);
if (lastpage)
write_page(bitmap, lastpage, 0);
else
if (log->type->flush(log))
bitmap->flags |= BITMAP_WRITE_ERROR;
write_page(bitmap, lastpage, 0);
} else {
set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
spin_unlock_irqrestore(&bitmap->lock, flags);
@ -1769,12 +1733,10 @@ int bitmap_create(mddev_t *mddev)
BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
if (!file
&& !mddev->bitmap_info.offset
&& !mddev->bitmap_info.log) /* bitmap disabled, nothing to do */
&& !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */
return 0;
BUG_ON(file && mddev->bitmap_info.offset);
BUG_ON(mddev->bitmap_info.offset && mddev->bitmap_info.log);
bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
if (!bitmap)
@ -1865,6 +1827,7 @@ int bitmap_create(mddev_t *mddev)
int bitmap_load(mddev_t *mddev)
{
int err = 0;
sector_t start = 0;
sector_t sector = 0;
struct bitmap *bitmap = mddev->bitmap;
@ -1883,24 +1846,14 @@ int bitmap_load(mddev_t *mddev)
}
bitmap_close_sync(bitmap);
if (mddev->bitmap_info.log) {
unsigned long i;
struct dm_dirty_log *log = mddev->bitmap_info.log;
for (i = 0; i < bitmap->chunks; i++)
if (!log->type->in_sync(log, i, 1))
bitmap_set_memory_bits(bitmap,
(sector_t)i << CHUNK_BLOCK_SHIFT(bitmap),
1);
} else {
sector_t start = 0;
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;
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;
err = bitmap_init_from_disk(bitmap, start);
err = bitmap_init_from_disk(bitmap, start);
}
if (err)
goto out;

5
drivers/md/bitmap.h
View File

@ -212,10 +212,6 @@ struct bitmap {
unsigned long file_pages; /* number of pages in the file */
int last_page_size; /* bytes in the last page */
unsigned long logattrs; /* used when filemap_attr doesn't exist
* because we are working with a dirty_log
*/
unsigned long flags;
int allclean;
@ -237,7 +233,6 @@ struct bitmap {
wait_queue_head_t behind_wait;
struct sysfs_dirent *sysfs_can_clear;
};
/* the bitmap API */

5
drivers/md/md.h
View File

@ -307,11 +307,6 @@ struct mddev_s
* hot-adding a bitmap. It should
* eventually be settable by sysfs.
*/
/* When md is serving under dm, it might use a
* dirty_log to store the bits.
*/
struct dm_dirty_log *log;
struct mutex mutex;
unsigned long chunksize;
unsigned long daemon_sleep; /* how many jiffies between updates? */