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author | NeilBrown <neilb@suse.de> | 2014-12-15 12:56:59 +1100 |
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committer | NeilBrown <neilb@suse.de> | 2015-02-06 09:32:56 +1100 |
commit | 758bfc8abfbc26c196a53c52d52d251f20226a5c (patch) | |
tree | a7642d30147db5f67f299b165b8941d619d658ba /drivers/md/md.c | |
parent | b7b17c9b67e5984210c83d50d2c8117d3bd50ea0 (diff) | |
download | op-kernel-dev-758bfc8abfbc26c196a53c52d52d251f20226a5c.zip op-kernel-dev-758bfc8abfbc26c196a53c52d52d251f20226a5c.tar.gz |
md: remove mddev_lock from rdev_attr_show()
No rdev attributes need locking for 'show', though
state_show() might benefit from ensuring it sees a
consistent set of flags.
None even use rdev->mddev, so testing for it isn't really
needed and it certainly doesn't need to be held constant.
So improve state_show() and remove the locking.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r-- | drivers/md/md.c | 36 |
1 files changed, 14 insertions, 22 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index dbbe5e6..5438834 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2419,40 +2419,41 @@ state_show(struct md_rdev *rdev, char *page) { char *sep = ""; size_t len = 0; + unsigned long flags = ACCESS_ONCE(rdev->flags); - if (test_bit(Faulty, &rdev->flags) || + if (test_bit(Faulty, &flags) || rdev->badblocks.unacked_exist) { len+= sprintf(page+len, "%sfaulty",sep); sep = ","; } - if (test_bit(In_sync, &rdev->flags)) { + if (test_bit(In_sync, &flags)) { len += sprintf(page+len, "%sin_sync",sep); sep = ","; } - if (test_bit(WriteMostly, &rdev->flags)) { + if (test_bit(WriteMostly, &flags)) { len += sprintf(page+len, "%swrite_mostly",sep); sep = ","; } - if (test_bit(Blocked, &rdev->flags) || + if (test_bit(Blocked, &flags) || (rdev->badblocks.unacked_exist - && !test_bit(Faulty, &rdev->flags))) { + && !test_bit(Faulty, &flags))) { len += sprintf(page+len, "%sblocked", sep); sep = ","; } - if (!test_bit(Faulty, &rdev->flags) && - !test_bit(In_sync, &rdev->flags)) { + if (!test_bit(Faulty, &flags) && + !test_bit(In_sync, &flags)) { len += sprintf(page+len, "%sspare", sep); sep = ","; } - if (test_bit(WriteErrorSeen, &rdev->flags)) { + if (test_bit(WriteErrorSeen, &flags)) { len += sprintf(page+len, "%swrite_error", sep); sep = ","; } - if (test_bit(WantReplacement, &rdev->flags)) { + if (test_bit(WantReplacement, &flags)) { len += sprintf(page+len, "%swant_replacement", sep); sep = ","; } - if (test_bit(Replacement, &rdev->flags)) { + if (test_bit(Replacement, &flags)) { len += sprintf(page+len, "%sreplacement", sep); sep = ","; } @@ -2965,21 +2966,12 @@ rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) { struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); - struct mddev *mddev = rdev->mddev; - ssize_t rv; if (!entry->show) return -EIO; - - rv = mddev ? mddev_lock(mddev) : -EBUSY; - if (!rv) { - if (rdev->mddev == NULL) - rv = -EBUSY; - else - rv = entry->show(rdev, page); - mddev_unlock(mddev); - } - return rv; + if (!rdev->mddev) + return -EBUSY; + return entry->show(rdev, page); } static ssize_t |