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The show_devname callback is used to print device name in /proc/self/mounts, we need to traverse the device list consistently and read the name that's copied to a seq buffer so we don't need further locking. If the first device is being deleted at the same time, the RCU will allow us to read the device name, though it will become stale right after the RCU protection ends. This is unavoidable and the user can expect that the device will disappear from the filesystem's list at some point. The device_list_mutex was pretty heavy as it is used eg. for writing superblock and a few other IO related contexts. This can stall any application that reads the proc file for no reason. Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.