Re: [PATCH 1/2] open: add close_range()
From: Al Viro <viro@zeniv.linux.org.uk>
Date: 2019-05-21 19:20:28
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linux-alpha, linux-api, linux-arch, linux-arm-kernel, linux-fsdevel, linux-kselftest, linux-mips, linux-s390, linux-sh, lkml, sparclinux
On Tue, May 21, 2019 at 05:30:27PM +0100, David Howells wrote:
If we can live with close_from(int first) rather than close_range(), then this can perhaps be done a lot more efficiently by: new = alloc_fdtable(first); spin_lock(&files->file_lock); old = files_fdtable(files); copy_fds(new, old, 0, first - 1); rcu_assign_pointer(files->fdt, new); spin_unlock(&files->file_lock); clear_fds(old, 0, first - 1); close_fdt_from(old, first); kfree_rcu(old);
I really hate to think how that would interact with POSIX locks...