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authorSigned-off-by: Jan Kara <jack@suse.cz>2010-09-16 20:36:36 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-09-16 20:36:36 +0200
commit01ea50638bc04ca5259f5711fcdedefcdde1cf43 (patch)
treec525dc13b05feab90d71b78a1d7adb0ddde081ea /fs
parent2786c4e5e54802c34297e55050fef3e862a27b3f (diff)
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block: Fix race during disk initialization
When a new disk is being discovered, add_disk() first ties the bdev to gendisk (via register_disk()->blkdev_get()) and only after that calls bdi_register_bdev(). Because register_disk() also creates disk's kobject, it can happen that userspace manages to open and modify the device's data (or inode) before its BDI is properly initialized leading to a warning in __mark_inode_dirty(). Fix the problem by registering BDI early enough. This patch addresses https://bugzilla.kernel.org/show_bug.cgi?id=16312 Cc: stable@kernel.org Reported-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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