From fc71d8330e39ef3af816a9c869150250952cb712 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Fri, 26 Apr 2013 15:44:36 -0500 Subject: [PATCH] rbd: fix up some sysfs stuff This just tweaks a few things in the routines that implement rbd sysfs files. All of the entries for an rbd device in /sys/bus/rbd/devices// will represent information whose valid values are known by the time they are accessible. Right now we get the size of the mapped image by a call to get_capacity(). There's no need to do this, because that will return what we last set the capacity to, which is just the size recorded for the mapping. So just show that value instead. We also get this under protection of the header semaphore, in order to provide a precisely correct value. This isn't really necessary; these files are really informational only and it's not necessary to be so careful. Finally, print a special value in case the major device number is not recorded. Right now that won't matter much but soon the parent images won't have devices associated with them. Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 83265adab19c..65d021be6c9e 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3170,13 +3170,9 @@ static ssize_t rbd_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); - sector_t size; - down_read(&rbd_dev->header_rwsem); - size = get_capacity(rbd_dev->disk); - up_read(&rbd_dev->header_rwsem); - - return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); + return sprintf(buf, "%llu\n", + (unsigned long long)rbd_dev->mapping.size); } /* @@ -3189,7 +3185,7 @@ static ssize_t rbd_features_show(struct device *dev, struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); return sprintf(buf, "0x%016llx\n", - (unsigned long long) rbd_dev->mapping.features); + (unsigned long long)rbd_dev->mapping.features); } static ssize_t rbd_major_show(struct device *dev, @@ -3197,7 +3193,11 @@ static ssize_t rbd_major_show(struct device *dev, { struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); - return sprintf(buf, "%d\n", rbd_dev->major); + if (rbd_dev->major) + return sprintf(buf, "%d\n", rbd_dev->major); + + return sprintf(buf, "(none)\n"); + } static ssize_t rbd_client_id_show(struct device *dev, @@ -3223,7 +3223,7 @@ static ssize_t rbd_pool_id_show(struct device *dev, struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); return sprintf(buf, "%llu\n", - (unsigned long long) rbd_dev->spec->pool_id); + (unsigned long long) rbd_dev->spec->pool_id); } static ssize_t rbd_name_show(struct device *dev, -- 2.20.1