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md/bitmap: don't read page from device with Bitmap_sync

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The device owns Bitmap_sync flag needs recovery
to become in sync, and read page from this type
device could get stale status.

Also add comments for Bitmap_sync bit per the
suggestion from Shaohua and Neil.

Previous disscussion can be found here:
https://marc.info/?t=149760428900004&r=1&w=2

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Guoqing Jiang
2017-07-04 11:20:30 +08:00
committed by Shaohua Li
parent af3c8d9850
commit 4aaf7694f8
2 changed files with 5 additions and 2 deletions
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3
drivers/md/bitmap.c
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@@ -156,7 +156,8 @@ static int read_sb_page(struct mddev *mddev, loff_t offset,
rdev_for_each(rdev, mddev) {
if (! test_bit(In_sync, &rdev->flags)
|| test_bit(Faulty, &rdev->flags))
|| test_bit(Faulty, &rdev->flags)
|| test_bit(Bitmap_sync, &rdev->flags))
continue;
target = offset + index * (PAGE_SIZE/512);