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| author | NeilBrown <neilb@suse.de> | 2011-05-11 06:26:30 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-05-11 06:26:30 +0200 |
| commit | 8258c53208d7a9b7207e7d4dae36d2ea384cb278 (patch) | |
| tree | 8ae5e67cde859e16dcc663c49269d025b9f6ce4b /drivers/md/bitmap.c | |
| parent | md: reject a re-add request that cannot be honoured. (diff) | |
| download | linux-8258c53208d7a9b7207e7d4dae36d2ea384cb278.tar.xz linux-8258c53208d7a9b7207e7d4dae36d2ea384cb278.zip | |
md/bitmap: fix saving of events_cleared and other state.
If a bitmap is found to be 'stale' the events_cleared value
is set to match 'events'.
However if the array is degraded this does not get stored on disk.
This can subsequently lead to incorrect behaviour.
So change bitmap_update_sb to always update events_cleared in the
superblock from the known events_cleared.
For neatness also set ->state from ->flags.
This requires updating ->state whenever we update ->flags, which makes
sense anyway.
This is suitable for any active -stable release.
cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/bitmap.c')
| -rw-r--r-- | drivers/md/bitmap.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 5c9362792f1d..70bd738b8b99 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -493,11 +493,11 @@ void bitmap_update_sb(struct bitmap *bitmap) spin_unlock_irqrestore(&bitmap->lock, flags); sb = kmap_atomic(bitmap->sb_page, KM_USER0); sb->events = cpu_to_le64(bitmap->mddev->events); - if (bitmap->mddev->events < bitmap->events_cleared) { + if (bitmap->mddev->events < bitmap->events_cleared) /* rocking back to read-only */ bitmap->events_cleared = bitmap->mddev->events; - sb->events_cleared = cpu_to_le64(bitmap->events_cleared); - } + sb->events_cleared = cpu_to_le64(bitmap->events_cleared); + sb->state = cpu_to_le32(bitmap->flags); /* Just in case these have been changed via sysfs: */ sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); @@ -618,7 +618,7 @@ success: if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) bitmap->flags |= BITMAP_HOSTENDIAN; bitmap->events_cleared = le64_to_cpu(sb->events_cleared); - if (sb->state & cpu_to_le32(BITMAP_STALE)) + if (bitmap->flags & BITMAP_STALE) bitmap->events_cleared = bitmap->mddev->events; err = 0; out: @@ -652,9 +652,11 @@ static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, switch (op) { case MASK_SET: sb->state |= cpu_to_le32(bits); + bitmap->flags |= bits; break; case MASK_UNSET: sb->state &= cpu_to_le32(~bits); + bitmap->flags &= ~bits; break; default: BUG(); |