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Btrfs: nuke a bogus rw_devices decrement in __btrfs_close_devices

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On mount failures, __btrfs_close_devices can be called well before
dev-replace state is read and ->is_tgtdev_for_dev_replace is set.  This
leads to a bogus decrement of ->rw_devices and sets off a WARN_ON in
__btrfs_close_devices if replace target device happens to be on the
lists and we fail early in the mount sequence.  Fix this by checking
the devid instead of ->is_tgtdev_for_dev_replace before the decrement:
for replace targets devid is always equal to BTRFS_DEV_REPLACE_DEVID.

Cc: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Ilya Dryomov 2013-10-10 20:37:29 +03:00 committed by Chris Mason
parent 03b2f08b5f
commit f747cab7b7
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/volumes.c
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@ -666,7 +666,8 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
if (device->bdev)
fs_devices->open_devices--;
if (device->writeable && !device->is_tgtdev_for_dev_replace) {
if (device->writeable &&
device->devid != BTRFS_DEV_REPLACE_DEVID) {
list_del_init(&device->dev_alloc_list);
fs_devices->rw_devices--;
}