[PATCH] md: fix some locking and module refcounting issues with md's use of sysfs
1/ I really should be using the __ATTR macros for defining attributes, so that the .owner field get set properly, otherwise modules can be removed while sysfs files are open. This also involves some name changes of _show routines. 2/ Always lock the mddev (against reconfiguration) for all sysfs attribute access. This easily avoid certain races and is completely consistant with other interfaces (ioctl and /proc/mdstat both always lock against reconfiguration). 3/ raid5 attributes must check that the 'conf' structure actually exists (the array could have been stopped while an attribute file was open). 4/ A missing 'kfree' from when the raid5_conf_t was converted to have a kobject embedded, and then converted back again. Signed-off-by: Neil Brown <neilb@suse.de> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -1504,7 +1504,7 @@ struct rdev_sysfs_entry {
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};
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static ssize_t
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rdev_show_state(mdk_rdev_t *rdev, char *page)
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state_show(mdk_rdev_t *rdev, char *page)
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{
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char *sep = "";
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int len=0;
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@ -1525,13 +1525,11 @@ rdev_show_state(mdk_rdev_t *rdev, char *page)
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return len+sprintf(page+len, "\n");
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}
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static struct rdev_sysfs_entry rdev_state = {
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.attr = {.name = "state", .mode = S_IRUGO },
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.show = rdev_show_state,
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};
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static struct rdev_sysfs_entry
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rdev_state = __ATTR_RO(state);
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static ssize_t
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rdev_show_super(mdk_rdev_t *rdev, char *page)
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super_show(mdk_rdev_t *rdev, char *page)
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{
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if (rdev->sb_loaded && rdev->sb_size) {
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memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
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@ -1539,10 +1537,8 @@ rdev_show_super(mdk_rdev_t *rdev, char *page)
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} else
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return 0;
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}
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static struct rdev_sysfs_entry rdev_super = {
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.attr = {.name = "super", .mode = S_IRUGO },
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.show = rdev_show_super,
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};
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static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
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static struct attribute *rdev_default_attrs[] = {
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&rdev_state.attr,
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&rdev_super.attr,
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@ -1728,7 +1724,7 @@ static void analyze_sbs(mddev_t * mddev)
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}
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static ssize_t
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md_show_level(mddev_t *mddev, char *page)
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level_show(mddev_t *mddev, char *page)
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{
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mdk_personality_t *p = mddev->pers;
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if (p == NULL)
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@ -1739,21 +1735,15 @@ md_show_level(mddev_t *mddev, char *page)
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return sprintf(page, "%s\n", p->name);
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}
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static struct md_sysfs_entry md_level = {
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.attr = {.name = "level", .mode = S_IRUGO },
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.show = md_show_level,
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};
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static struct md_sysfs_entry md_level = __ATTR_RO(level);
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static ssize_t
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md_show_rdisks(mddev_t *mddev, char *page)
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raid_disks_show(mddev_t *mddev, char *page)
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{
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return sprintf(page, "%d\n", mddev->raid_disks);
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}
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static struct md_sysfs_entry md_raid_disks = {
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.attr = {.name = "raid_disks", .mode = S_IRUGO },
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.show = md_show_rdisks,
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};
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static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
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static ssize_t
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md_show_scan(mddev_t *mddev, char *page)
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@ -1782,10 +1772,10 @@ md_store_scan(mddev_t *mddev, const char *page, size_t len)
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if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
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test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
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return -EBUSY;
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down(&mddev->reconfig_sem);
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if (mddev->pers && mddev->pers->sync_request)
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canscan=1;
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up(&mddev->reconfig_sem);
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if (!canscan)
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return -EINVAL;
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@ -1801,22 +1791,18 @@ md_store_scan(mddev_t *mddev, const char *page, size_t len)
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}
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static ssize_t
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md_show_mismatch(mddev_t *mddev, char *page)
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mismatch_cnt_show(mddev_t *mddev, char *page)
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{
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return sprintf(page, "%llu\n",
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(unsigned long long) mddev->resync_mismatches);
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}
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static struct md_sysfs_entry md_scan_mode = {
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.attr = {.name = "scan_mode", .mode = S_IRUGO|S_IWUSR },
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.show = md_show_scan,
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.store = md_store_scan,
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};
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static struct md_sysfs_entry
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md_scan_mode = __ATTR(scan_mode, S_IRUGO|S_IWUSR, md_show_scan, md_store_scan);
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static struct md_sysfs_entry md_mismatches = {
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.attr = {.name = "mismatch_cnt", .mode = S_IRUGO },
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.show = md_show_mismatch,
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};
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static struct md_sysfs_entry
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md_mismatches = __ATTR_RO(mismatch_cnt);
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static struct attribute *md_default_attrs[] = {
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&md_level.attr,
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@ -1831,10 +1817,14 @@ md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
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{
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struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
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mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
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ssize_t rv;
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if (!entry->show)
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return -EIO;
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return entry->show(mddev, page);
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mddev_lock(mddev);
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rv = entry->show(mddev, page);
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mddev_unlock(mddev);
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return rv;
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}
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static ssize_t
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@ -1843,10 +1833,14 @@ md_attr_store(struct kobject *kobj, struct attribute *attr,
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{
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struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
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mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
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ssize_t rv;
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if (!entry->store)
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return -EIO;
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return entry->store(mddev, page, length);
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mddev_lock(mddev);
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rv = entry->store(mddev, page, length);
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mddev_unlock(mddev);
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return rv;
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}
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static void md_free(struct kobject *ko)
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@ -1746,7 +1746,10 @@ static ssize_t
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raid5_show_stripe_cache_size(mddev_t *mddev, char *page)
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{
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raid5_conf_t *conf = mddev_to_conf(mddev);
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if (conf)
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return sprintf(page, "%d\n", conf->max_nr_stripes);
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else
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return 0;
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}
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static ssize_t
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@ -1757,6 +1760,8 @@ raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
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int new;
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if (len >= PAGE_SIZE)
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return -EINVAL;
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if (!conf)
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return -ENODEV;
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new = simple_strtoul(page, &end, 10);
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if (!*page || (*end && *end != '\n') )
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@ -1777,23 +1782,23 @@ raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
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return len;
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}
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static struct md_sysfs_entry raid5_stripecache_size = {
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.attr = {.name = "stripe_cache_size", .mode = S_IRUGO | S_IWUSR },
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.show = raid5_show_stripe_cache_size,
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.store = raid5_store_stripe_cache_size,
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};
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static struct md_sysfs_entry
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raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR,
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raid5_show_stripe_cache_size,
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raid5_store_stripe_cache_size);
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static ssize_t
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raid5_show_stripe_cache_active(mddev_t *mddev, char *page)
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stripe_cache_active_show(mddev_t *mddev, char *page)
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{
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raid5_conf_t *conf = mddev_to_conf(mddev);
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if (conf)
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return sprintf(page, "%d\n", atomic_read(&conf->active_stripes));
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else
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return 0;
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}
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static struct md_sysfs_entry raid5_stripecache_active = {
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.attr = {.name = "stripe_cache_active", .mode = S_IRUGO},
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.show = raid5_show_stripe_cache_active,
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};
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static struct md_sysfs_entry
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raid5_stripecache_active = __ATTR_RO(stripe_cache_active);
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static struct attribute *raid5_attrs[] = {
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&raid5_stripecache_size.attr,
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@ -1981,6 +1986,7 @@ static int stop(mddev_t *mddev)
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free_pages((unsigned long) conf->stripe_hashtbl, HASH_PAGES_ORDER);
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blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
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sysfs_remove_group(&mddev->kobj, &raid5_attrs_group);
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kfree(conf);
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mddev->private = NULL;
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return 0;
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}
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