diff options
| author | NeilBrown <neilb@suse.de> | 2014-12-15 12:56:59 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2015-02-06 09:32:55 +1100 |
| commit | b7b17c9b67e5984210c83d50d2c8117d3bd50ea0 (patch) | |
| tree | 072e63fa9cd1e1c314d9d99d0ae77d9e955d1a38 /drivers/md/md.c | |
| parent | 7b1485bab9c49b0d3811d72beb0de60c7b8b337d (diff) | |
md: remove mddev_lock() from md_attr_show()
Most attributes can be read safely without any locking.
A race might lead to a slightly out-dated value, but nothing wrong.
We already have locking in some places where needed.
All that remains is can_clear_show(), behind_writes_used_show()
and action_show() which are easily fixed.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index eb0c3b576d7d..dbbe5e6df24c 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -4042,20 +4042,21 @@ static ssize_t action_show(struct mddev *mddev, char *page) { char *type = "idle"; - if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) + unsigned long recovery = mddev->recovery; + if (test_bit(MD_RECOVERY_FROZEN, &recovery)) type = "frozen"; - else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || - (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { - if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) + else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || + (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { + if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) type = "reshape"; - else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { - if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) + else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { + if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) type = "resync"; - else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) + else if (test_bit(MD_RECOVERY_CHECK, &recovery)) type = "check"; else type = "repair"; - } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) + } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) type = "recover"; } return sprintf(page, "%s\n", type); @@ -4572,11 +4573,7 @@ md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) mddev_get(mddev); spin_unlock(&all_mddevs_lock); - rv = mddev_lock(mddev); - if (!rv) { - rv = entry->show(mddev, page); - mddev_unlock(mddev); - } + rv = entry->show(mddev, page); mddev_put(mddev); return rv; } |