Chuck Lever 2dda99b3d5 NFS: Retry mounting NFSROOT ... commit 43717c7dae upstream. Lukas Razik <linux@razik.name> reports that on his SPARC system, booting with an NFS root file system stopped working after commit 56463e50 "NFS: Use super.c for NFSROOT mount option parsing." We found that the network switch to which Lukas' client was attached was delaying access to the LAN after the client's NIC driver reported that its link was up. The delay was longer than the timeouts used in the NFS client during mounting. NFSROOT worked for Lukas before commit 56463e50 because in those kernels, the client's first operation was an rpcbind request to determine which port the NFS server was listening on. When that request failed after a long timeout, the client simply selected the default NFS port (2049). By that time the switch was allowing access to the LAN, and the mount succeeded. Neither of these client behaviors is desirable, so reverting 56463e50 is really not a choice. Instead, introduce a mechanism that retries the NFSROOT mount request several times. This is the same tactic that normal user space NFS mounts employ to overcome server and network delays. Signed-off-by: Lukas Razik <linux@razik.name> [ cel: match kernel coding style, add proper patch description ] [ cel: add exponential back-off ] Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Lukas Razik <linux@razik.name> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2012-01-25 17:24:35 -08:00
..
calibrate.c	Fix CPU spinlock lockups on secondary CPU bringup	2011-06-23 08:59:38 -07:00
do_mounts.c	NFS: Retry mounting NFSROOT	2012-01-25 17:24:35 -08:00
do_mounts.h	md: move lots of #include lines out of .h files and into .c	2009-03-31 14:33:13 +11:00
do_mounts_initrd.c	Make do_execve() take a const filename pointer	2010-08-17 18:07:43 -07:00
do_mounts_md.c	init: mark __user address space on string literals	2010-10-26 16:52:15 -07:00
do_mounts_rd.c	init: return proper error code in do_mounts_rd()	2011-03-22 17:44:15 -07:00
initramfs.c	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2010-10-28 15:13:55 -07:00
Kconfig	gcov: disable CONFIG_CONSTRUCTORS when not needed by CONFIG_GCOV_KERNEL	2011-06-15 20:04:01 -07:00
main.c	generic-ipi: Fix kexec boot crash by initializing call_single_queue before enabling interrupts	2011-06-17 10:17:12 +02:00
Makefile	kbuild: move compile.h to include/generated	2009-12-12 13:08:14 +01:00
noinitramfs.c	init: mark __user address space on string literals	2010-10-26 16:52:15 -07:00
version.c	userns: add a user_namespace as creator/owner of uts_namespace	2011-03-23 19:46:59 -07:00