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f2fs: split discard policy

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There are many different scenarios such as fstrim, umount, urgent or
background where we will issue discards, actually, they need use
different policy in aspect of io aware, discard granularity, delay
interval and so on. But now they just share one common discard policy,
so there will be race when changing policy in between these scenarios,
the interference of changing discard policy will be very serious.

This patch changes to split discard policy for different scenarios.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2017-10-04 09:08:34 +08:00
committed by Jaegeuk Kim
parent ecc9aa00db
commit 78997b569f
4 changed files with 88 additions and 96 deletions
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13
fs/f2fs/sysfs.c
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@@ -154,23 +154,10 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
}
if (!strcmp(a->attr.name, "discard_granularity")) {
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
int i;
if (t == 0 || t > MAX_PLIST_NUM)
return -EINVAL;
if (t == *ui)
return count;
mutex_lock(&dcc->cmd_lock);
for (i = 0; i < MAX_PLIST_NUM; i++) {
if (i >= t - 1)
dcc->pend_list_tag[i] |= P_ACTIVE;
else
dcc->pend_list_tag[i] &= (~P_ACTIVE);
}
mutex_unlock(&dcc->cmd_lock);
*ui = t;
return count;
}