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writeback: use RCU to protect bdi_list

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Now that bdi_writeback_all() no longer handles integrity writeback,
it doesn't have to block anymore. This means that we can switch
bdi_list reader side protection to RCU.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2009-09-14 13:12:40 +02:00
commit cfc4ba5365
4 changed files with 63 additions and 28 deletions
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8
mm/page-writeback.c
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@ -315,7 +315,7 @@ int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
{
int ret = 0;
spin_lock(&bdi_lock);
spin_lock_bh(&bdi_lock);
if (min_ratio > bdi->max_ratio) {
ret = -EINVAL;
} else {
@ -327,7 +327,7 @@ int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
ret = -EINVAL;
}
}
spin_unlock(&bdi_lock);
spin_unlock_bh(&bdi_lock);
return ret;
}
@ -339,14 +339,14 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio)
if (max_ratio > 100)
return -EINVAL;
spin_lock(&bdi_lock);
spin_lock_bh(&bdi_lock);
if (bdi->min_ratio > max_ratio) {
ret = -EINVAL;
} else {
bdi->max_ratio = max_ratio;
bdi->max_prop_frac = (PROP_FRAC_BASE * max_ratio) / 100;
}
spin_unlock(&bdi_lock);
spin_unlock_bh(&bdi_lock);
return ret;
}