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| author | Guoqing Jiang <gqjiang@suse.com> | 2017-07-04 11:20:30 +0800 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2017-07-10 10:30:41 -0700 |
| commit | 4aaf7694f841edc96fe0f72958aabe59204b3611 (patch) | |
| tree | 585730b5ab2b04fb7a96994caa37b08eaa143da7 | |
| parent | af3c8d98508d37541d4bf57f13a984a7f73a328c (diff) | |
| download | linux-exynos-4aaf7694f841edc96fe0f72958aabe59204b3611.tar.gz linux-exynos-4aaf7694f841edc96fe0f72958aabe59204b3611.tar.bz2 linux-exynos-4aaf7694f841edc96fe0f72958aabe59204b3611.zip | |
md/bitmap: don't read page from device with Bitmap_sync
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>
| -rw-r--r-- | drivers/md/bitmap.c | 3 | ||||
| -rw-r--r-- | drivers/md/md.h | 4 |
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index f4eace5ea184..40f3cd7eab0f 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -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); diff --git a/drivers/md/md.h b/drivers/md/md.h index 991f0fe2dcc6..b50eb4ac1b82 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -134,7 +134,9 @@ enum flag_bits { Faulty, /* device is known to have a fault */ In_sync, /* device is in_sync with rest of array */ Bitmap_sync, /* ..actually, not quite In_sync. Need a - * bitmap-based recovery to get fully in sync + * bitmap-based recovery to get fully in sync. + * The bit is only meaningful before device + * has been passed to pers->hot_add_disk. */ WriteMostly, /* Avoid reading if at all possible */ AutoDetected, /* added by auto-detect */ |