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authorJan Kara2017-03-23 01:37:00 +0100
committerJens Axboe2017-03-23 03:11:33 +0100
commitf759741d9d913eb57784a94b9bca78b376fc26a9 (patch)
tree19832434e2c4c1db34bceee048f422b910300686 /crypto/seqiv.c
parentbdi: Rename cgwb_bdi_destroy() to cgwb_bdi_unregister() (diff)
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block: Fix oops in locked_inode_to_wb_and_lock_list()
When block device is closed, we call inode_detach_wb() in __blkdev_put() which sets inode->i_wb to NULL. That is contrary to expectations that inode->i_wb stays valid once set during the whole inode's lifetime and leads to oops in wb_get() in locked_inode_to_wb_and_lock_list() because inode_to_wb() returned NULL. The reason why we called inode_detach_wb() is not valid anymore though. BDI is guaranteed to stay along until we call bdi_put() from bdev_evict_inode() so we can postpone calling inode_detach_wb() to that moment. Also add a warning to catch if someone uses inode_detach_wb() in a dangerous way. Reported-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'crypto/seqiv.c')
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