bcache: check for allocation failures

[karo-tx-linux.git] / drivers / md / bcache / sysfs.c

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index cf8d91ec3238d1c5f04d0118bdf38085a9b5347a..12a2c2846f994a1e2d51bf79374426df96893418 100644 (file)
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -81,6 +81,9 @@ rw_attribute(writeback_rate_p_term_inverse);
 rw_attribute(writeback_rate_d_smooth);
 read_attribute(writeback_rate_debug);
 
+read_attribute(stripe_size);
+read_attribute(partial_stripes_expensive);
+
 rw_attribute(synchronous);
 rw_attribute(journal_delay_ms);
 rw_attribute(discard);
@@ -147,6 +150,9 @@ SHOW(__bch_cached_dev)
        sysfs_hprint(dirty_data,
                     bcache_dev_sectors_dirty(&dc->disk) << 9);
 
+       sysfs_hprint(stripe_size,       (1 << dc->disk.stripe_size_bits) << 9);
+       var_printf(partial_stripes_expensive,   "%u");
+
        var_printf(sequential_merge,    "%i");
        var_hprint(sequential_cutoff);
        var_hprint(readahead);
@@ -172,6 +178,7 @@ STORE(__cached_dev)
                                             disk.kobj);
        unsigned v = size;
        struct cache_set *c;
+       struct kobj_uevent_env *env;
 
 #define d_strtoul(var)         sysfs_strtoul(var, dc->var)
 #define d_strtoi_h(var)                sysfs_hatoi(var, dc->var)
@@ -216,6 +223,7 @@ STORE(__cached_dev)
        }
 
        if (attr == &sysfs_label) {
+               /* note: endlines are preserved */
                memcpy(dc->sb.label, buf, SB_LABEL_SIZE);
                bch_write_bdev_super(dc, NULL);
                if (dc->disk.c) {
@@ -223,6 +231,15 @@ STORE(__cached_dev)
                               buf, SB_LABEL_SIZE);
                        bch_uuid_write(dc->disk.c);
                }
+               env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
+               if (!env)
+                       return -ENOMEM;
+               add_uevent_var(env, "DRIVER=bcache");
+               add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
+               add_uevent_var(env, "CACHED_LABEL=%s", buf);
+               kobject_uevent_env(
+                       &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp);
+               kfree(env);
        }
 
        if (attr == &sysfs_attach) {
@@ -286,6 +303,8 @@ static struct attribute *bch_cached_dev_files[] = {
        &sysfs_writeback_rate_d_smooth,
        &sysfs_writeback_rate_debug,
        &sysfs_dirty_data,
+       &sysfs_stripe_size,
+       &sysfs_partial_stripes_expensive,
        &sysfs_sequential_cutoff,
        &sysfs_sequential_merge,
        &sysfs_clear_stats,