From 05fd6f6f8c7b07e746d513e4cf862675b70aac59 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Wed, 29 Aug 2012 17:11:07 -0500 Subject: [PATCH] rbd: read the header before registering device Read the rbd header information and call rbd_dev_set_mapping() earlier--before registering the block device or setting up the sysfs entries for the image. The sysfs entries provide users access to some information that's only available after doing the rbd header initialization, so this will make sure it's valid right away. Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index a9f5de2..aa4752d 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -2601,10 +2601,25 @@ static ssize_t rbd_add(struct bus_type *bus, goto err_out_client; sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); + /* Get information about the image being mapped */ + + rc = rbd_read_header(rbd_dev, &rbd_dev->header); + if (rc) + goto err_out_client; + + /* no need to lock here, as rbd_dev is not registered yet */ + rc = rbd_dev_snaps_update(rbd_dev); + if (rc) + goto err_out_header; + + rc = rbd_dev_set_mapping(rbd_dev, snap_name); + if (rc) + goto err_out_header; + /* register our block device */ rc = register_blkdev(0, rbd_dev->name); if (rc < 0) - goto err_out_client; + goto err_out_header; rbd_dev->major = rc; rc = rbd_bus_add_dev(rbd_dev); @@ -2616,20 +2631,6 @@ static ssize_t rbd_add(struct bus_type *bus, * of the sysfs code (initiated by rbd_bus_del_dev()). */ - /* contact OSD, request size info about the object being mapped */ - rc = rbd_read_header(rbd_dev, &rbd_dev->header); - if (rc) - goto err_out_bus; - - /* no need to lock here, as rbd_dev is not registered yet */ - rc = rbd_dev_snaps_update(rbd_dev); - if (rc) - goto err_out_bus; - - rc = rbd_dev_set_mapping(rbd_dev, snap_name); - if (rc) - goto err_out_bus; - down_write(&rbd_dev->header_rwsem); rc = rbd_dev_snaps_register(rbd_dev); up_write(&rbd_dev->header_rwsem); @@ -2664,6 +2665,8 @@ err_out_bus: err_out_blkdev: unregister_blkdev(rbd_dev->major, rbd_dev->name); +err_out_header: + rbd_header_free(&rbd_dev->header); err_out_client: kfree(rbd_dev->header_name); rbd_put_client(rbd_dev); -- 2.7.4