Author: kib Date: Mon Mar 9 23:40:25 2020 New Revision: 358827 URL: https://svnweb.freebsd.org/changeset/base/358827
Log: pipe: explain why not deallocating inode number is fine. Suggested and reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D24009 Modified: head/sys/kern/sys_pipe.c Modified: head/sys/kern/sys_pipe.c ============================================================================== --- head/sys/kern/sys_pipe.c Mon Mar 9 23:08:24 2020 (r358826) +++ head/sys/kern/sys_pipe.c Mon Mar 9 23:40:25 2020 (r358827) @@ -367,6 +367,15 @@ pipe_paircreate(struct thread *td, struct pipepair **p goto fail; error = pipe_create(wpipe, false); if (error != 0) { + /* + * This cleanup leaves the pipe inode number for rpipe + * still allocated, but never used. We do not free + * inode numbers for opened pipes, which is required + * for correctness because numbers must be unique. + * But also it avoids any memory use by the unr + * allocator, so stashing away the transient inode + * number is reasonable. + */ pipe_free_kmem(rpipe); goto fail; } _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
