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md/r5cache: move mddev_lock() out of r5c_journal_mode_set() 

r5c_journal_mode_set() is called by r5c_journal_mode_store() and
raid_ctr() in dm-raid. We don't need mddev_lock() when calling from
raid_ctr(). This patch fixes this by moves the mddev_lock() to
r5c_journal_mode_store().

Cc: stable@vger.kernel.org (v4.13+)
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu 2017-11-19 22:17:00 -08:00 committed by Shaohua Li
parent aff69d89bd
commit ff35f58e8f
1 changed files with 9 additions and 13 deletions
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22
drivers/md/raid5-cache.c
View File

@ -2577,31 +2577,22 @@ static ssize_t r5c_journal_mode_show(struct mddev *mddev, char *page)
int r5c_journal_mode_set(struct mddev *mddev, int mode)
{
struct r5conf *conf;
int err;
if (mode < R5C_JOURNAL_MODE_WRITE_THROUGH ||
mode > R5C_JOURNAL_MODE_WRITE_BACK)
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
conf = mddev->private;
if (!conf || !conf->log) {
mddev_unlock(mddev);
if (!conf || !conf->log)
return -ENODEV;
}
if (raid5_calc_degraded(conf) > 0 &&
mode == R5C_JOURNAL_MODE_WRITE_BACK) {
mddev_unlock(mddev);
mode == R5C_JOURNAL_MODE_WRITE_BACK)
return -EINVAL;
}
mddev_suspend(mddev);
conf->log->r5c_journal_mode = mode;
mddev_resume(mddev);
mddev_unlock(mddev);
pr_debug("md/raid:%s: setting r5c cache mode to %d: %s\n",
mdname(mddev), mode, r5c_journal_mode_str[mode]);
@ -2614,6 +2605,7 @@ static ssize_t r5c_journal_mode_store(struct mddev *mddev,
{
int mode = ARRAY_SIZE(r5c_journal_mode_str);
size_t len = length;
int ret;
if (len < 2)
return -EINVAL;
@ -2625,8 +2617,12 @@ static ssize_t r5c_journal_mode_store(struct mddev *mddev,
if (strlen(r5c_journal_mode_str[mode]) == len &&
!strncmp(page, r5c_journal_mode_str[mode], len))
break;
return r5c_journal_mode_set(mddev, mode) ?: length;
ret = mddev_lock(mddev);
if (ret)
return ret;
ret = r5c_journal_mode_set(mddev, mode);
mddev_unlock(mddev);
return ret ?: length;
}
struct md_sysfs_entry