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md/bitmap: separate out loading a bitmap from initialising the structures.

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dm makes this distinction between ->ctr and ->resume, so we need to
too.

Also get the new bitmap_load to clear out the bitmap first, as this is
most consistent with the dm suspend/resume approach

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
2010-06-01 19:37:35 +10:00
parent e384e58549
commit 69e51b449d
3 changed files with 60 additions and 23 deletions
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69
drivers/md/bitmap.c
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@@ -1681,7 +1681,6 @@ int bitmap_create(mddev_t *mddev)
unsigned long pages;
struct file *file = mddev->bitmap_info.file;
int err;
sector_t start;
struct sysfs_dirent *bm = NULL;
BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
@@ -1763,13 +1762,40 @@ int bitmap_create(mddev_t *mddev)
if (!bitmap->bp)
goto error;
/* now that we have some pages available, initialize the in-memory
* bitmap from the on-disk bitmap */
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;
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(mddev_t *mddev)
{
int err = 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) {
int blocks;
bitmap_start_sync(bitmap, sector, &blocks, 0);
sector += blocks;
}
bitmap_close_sync(bitmap);
if (mddev->bitmap_info.log) {
unsigned long i;
struct dm_dirty_log *log = mddev->bitmap_info.log;
@@ -1778,29 +1804,30 @@ int bitmap_create(mddev_t *mddev)
bitmap_set_memory_bits(bitmap,
(sector_t)i << CHUNK_BLOCK_SHIFT(bitmap),
1);
err = 0;
} else
} 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;
err = bitmap_init_from_disk(bitmap, start);
}
if (err)
goto error;
printk(KERN_INFO "created bitmap (%lu pages) for device %s\n",
pages, bmname(bitmap));
mddev->bitmap = bitmap;
goto out;
mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;
md_wakeup_thread(mddev->thread);
bitmap_update_sb(bitmap);
return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0;
error:
bitmap_free(bitmap);
if (bitmap->flags & BITMAP_WRITE_ERROR)
err = -EIO;
out:
return err;
}
EXPORT_SYMBOL_GPL(bitmap_load);
static ssize_t
location_show(mddev_t *mddev, char *page)