summaryrefslogtreecommitdiffstats
path: root/drivers/md
diff options
context:
space:
mode:
authorColy Li <colyli@suse.de>2019-06-28 19:59:33 +0800
committerJens Axboe <axboe@kernel.dk>2019-06-28 07:39:14 -0600
commit0b13efecf5f25ce5e31f2ab3930335015cb65a7d (patch)
tree03280dc95522f10714145d714703c1080b011230 /drivers/md
parent89e0341af082dbc170019f908846f4a424efc86b (diff)
downloadlinux-0b13efecf5f25ce5e31f2ab3930335015cb65a7d.tar.bz2
bcache: add return value check to bch_cached_dev_run()
This patch adds return value check to bch_cached_dev_run(), now if there is error happens inside bch_cached_dev_run(), it can be catched. Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bcache/bcache.h2
-rw-r--r--drivers/md/bcache/super.c33
-rw-r--r--drivers/md/bcache/sysfs.c7
3 files changed, 32 insertions, 10 deletions
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index fdf75352e16a..73a97586a2ef 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -1006,7 +1006,7 @@ int bch_flash_dev_create(struct cache_set *c, uint64_t size);
int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
uint8_t *set_uuid);
void bch_cached_dev_detach(struct cached_dev *dc);
-void bch_cached_dev_run(struct cached_dev *dc);
+int bch_cached_dev_run(struct cached_dev *dc);
void bcache_device_stop(struct bcache_device *d);
void bch_cache_set_unregister(struct cache_set *c);
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 73466bda12a7..0abee44092bf 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -910,7 +910,7 @@ static int cached_dev_status_update(void *arg)
}
-void bch_cached_dev_run(struct cached_dev *dc)
+int bch_cached_dev_run(struct cached_dev *dc)
{
struct bcache_device *d = &dc->disk;
char *buf = kmemdup_nul(dc->sb.label, SB_LABEL_SIZE, GFP_KERNEL);
@@ -921,11 +921,14 @@ void bch_cached_dev_run(struct cached_dev *dc)
NULL,
};
+ if (dc->io_disable)
+ return -EIO;
+
if (atomic_xchg(&dc->running, 1)) {
kfree(env[1]);
kfree(env[2]);
kfree(buf);
- return;
+ return -EBUSY;
}
if (!d->c &&
@@ -951,8 +954,11 @@ void bch_cached_dev_run(struct cached_dev *dc)
kfree(buf);
if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") ||
- sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache"))
+ sysfs_create_link(&disk_to_dev(d->disk)->kobj,
+ &d->kobj, "bcache")) {
pr_debug("error creating sysfs link");
+ return -ENOMEM;
+ }
dc->status_update_thread = kthread_run(cached_dev_status_update,
dc, "bcache_status_update");
@@ -961,6 +967,8 @@ void bch_cached_dev_run(struct cached_dev *dc)
"continue to run without monitoring backing "
"device status");
}
+
+ return 0;
}
/*
@@ -1056,6 +1064,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
uint32_t rtime = cpu_to_le32((u32)ktime_get_real_seconds());
struct uuid_entry *u;
struct cached_dev *exist_dc, *t;
+ int ret = 0;
if ((set_uuid && memcmp(set_uuid, c->sb.set_uuid, 16)) ||
(!set_uuid && memcmp(dc->sb.set_uuid, c->sb.set_uuid, 16)))
@@ -1165,7 +1174,12 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
bch_sectors_dirty_init(&dc->disk);
- bch_cached_dev_run(dc);
+ ret = bch_cached_dev_run(dc);
+ if (ret && (ret != -EBUSY)) {
+ up_write(&dc->writeback_lock);
+ return ret;
+ }
+
bcache_device_link(&dc->disk, c, "bdev");
atomic_inc(&c->attached_dev_nr);
@@ -1292,6 +1306,7 @@ static int register_bdev(struct cache_sb *sb, struct page *sb_page,
{
const char *err = "cannot allocate memory";
struct cache_set *c;
+ int ret = -ENOMEM;
bdevname(bdev, dc->backing_dev_name);
memcpy(&dc->sb, sb, sizeof(struct cache_sb));
@@ -1321,14 +1336,18 @@ static int register_bdev(struct cache_sb *sb, struct page *sb_page,
bch_cached_dev_attach(dc, c, NULL);
if (BDEV_STATE(&dc->sb) == BDEV_STATE_NONE ||
- BDEV_STATE(&dc->sb) == BDEV_STATE_STALE)
- bch_cached_dev_run(dc);
+ BDEV_STATE(&dc->sb) == BDEV_STATE_STALE) {
+ err = "failed to run cached device";
+ ret = bch_cached_dev_run(dc);
+ if (ret)
+ goto err;
+ }
return 0;
err:
pr_notice("error %s: %s", dc->backing_dev_name, err);
bcache_device_stop(&dc->disk);
- return -EIO;
+ return ret;
}
/* Flash only volumes */
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 760cf8951338..eb678e43ac00 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -325,8 +325,11 @@ STORE(__cached_dev)
bch_cache_accounting_clear(&dc->accounting);
if (attr == &sysfs_running &&
- strtoul_or_return(buf))
- bch_cached_dev_run(dc);
+ strtoul_or_return(buf)) {
+ v = bch_cached_dev_run(dc);
+ if (v)
+ return v;
+ }
if (attr == &sysfs_cache_mode) {
v = sysfs_match_string(bch_cache_modes, buf);