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6cbd933b37
freebsd-nq/sys/kern
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Ian Lepore 6cbd933b37 Changes to allow using BOOTP_NFSROOT and mounting an nfs root filesystem 
other than the one specified by the BOOTP server.  This configures NFS
using the BOOTP protocol while also respecting other root-path options such
as setting vfs.root.mountfrom in the environment or using the RB_DFLTROOT
boot option.  It allows you to override the root path provided by the
server, or to supply a root path when the server provides IP configuration
but no root path info.

This maintains the historical BOOTP_NFSROOT behavior of panicking on a
failure to mount the root path provided by the server, unless you've
provided an alternative via the ROOTDEVNAME kernel option or by setting
vfs.root.mountfrom.  The behavior of panicking when given no other options
is preserved because it amounts to a bit of a retry loop that could
eventually recover from a transient network or server problem.

The user can now override the root path from loader(8) even if the
kernel is compiled with BOOTP_NFSROOT.  If vfs.root.mountfrom is set in
the environment it is used unconditionally -- it always overrides the
BOOTP info.  If it begins with [old]nfs: then the BOOTP code uses it
instead of the server-provided info.  If it specifies some other
filesystem then the bootp code will not panic like it used to and the code
in vfs_mountroot.c will invoke the right filesystem to do the mount.

If the kernel is compiled with the ROOTDEVNAME option, then that name is
used by the BOOTP code if either
      * The server doesn't provide a pathname.
      * The boothowto flags include RB_DFLTROOT.
The latter allows the user to compile in alternate path in ROOTDEVNAME
such as ufs:/dev/da0s1a and boot from that path by setting
boot_dftlroot=1 in loader(8) or using the '-r' option in boot(8).

The one thing not provided here is automatic failover from a
server-provided path to a compiled-in one without the user manually
requesting that.  The code just isn't currently structured in a way that
makes that possible with a lot of rewrite.  I think the ability to set
vfs.root.mountfrom and to use ROOTDEVNAME automatically when the server
doesn't provide a name covers the most common needs.

A set of patches submitted by Lars Eggert provided the part I couldn't
figure out by myself when I tried to do this last year; many thanks.

Reviewed by:	rodrigc
2013-07-31 19:14:00 +00:00
..
bus_if.m Add a BUS_CHILD_DELETED() method that a bus can hook to allow it to cleanup 2012-08-21 18:13:09 +00:00
capabilities.conf Add pipe2() system call. 2013-05-01 22:42:42 +00:00
clock_if.m
cpufreq_if.m
device_if.m Revert r239178 and implement two new functions, namely 2012-08-15 15:42:57 +00:00
dtio_kdtrace.c Change the module name for the I/O provider to "kernel" from 2012-09-25 19:16:28 +00:00
genassym.sh
imgact_aout.c Cosmetics: define FREEBSD32_MINUSER and AOUT32_MINUSER for struct 2012-07-22 13:41:45 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Introduce a constant, ELF_NOTE_ROUNDSIZE, which evidently declare our 2013-05-01 14:59:16 +00:00
imgact_gzip.c - Correct mispellings of the word necessary 2013-04-17 11:42:40 +00:00
imgact_shell.c The execution of the shebang script requires putting interpreter path, 2011-03-06 22:59:30 +00:00
inflate.c
init_main.c rename scheduler->swapper and SI_SUB_RUN_SCHEDULER->SI_SUB_LAST 2013-07-24 09:45:31 +00:00
init_sysent.c aio_mlock() added: 2013-06-08 13:30:13 +00:00
kern_acct.c acct: create a special plimit object and set it for exiting processes 2013-06-30 19:08:06 +00:00
kern_alq.c The fix committed in r250951 replaced the reported panic with a deadlock... gold 2013-06-17 09:49:07 +00:00
kern_clock.c Correct a bug that prevented deadlkres from (almost) ever firing. 2013-06-28 15:55:30 +00:00
kern_clocksource.c - Make callout(9) tickless, relying on eventtimers(4) as backend for 2013-03-04 11:09:56 +00:00
kern_condvar.c MFcalloutng: 2013-03-04 12:20:48 +00:00
kern_conf.c Reject spaces and double quotation marks in device names. devctl(4) 2012-12-22 13:33:28 +00:00
kern_cons.c cngetc: use cpu_spinwait to ease the cncheckc loop a tiny bit 2012-10-06 19:50:23 +00:00
kern_context.c In order to maximize the re-usability of kernel code in user space this 2011-09-16 13:58:51 +00:00
kern_cpu.c Revert r175376 and tune cpufreq(4) frequency comparison logic instead. 2012-03-10 18:56:16 +00:00
kern_cpuset.c Several improvements to rmlock(9). Many of these are based on patches 2013-06-25 18:44:15 +00:00
kern_ctf.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
kern_descrip.c Plug up the lock lock leakage when exporting to a short buffer. 2013-07-01 03:27:14 +00:00
kern_dtrace.c Mark MALLOC_DEFINEs static that have no corresponding MALLOC_DECLAREs. 2011-11-07 06:44:47 +00:00
kern_environment.c r249408 and r249436 cause a NULL pointer dereference on the CUBIEBOARD 2013-04-16 22:09:08 +00:00
kern_et.c Fix incorrect assertion that caused panic when periodic-only timers used. 2013-03-13 06:42:01 +00:00
kern_event.c Change callout use counter to use C11 atomics. 2013-06-16 09:30:35 +00:00
kern_exec.c Don't busy the page unless we are likely to release the object lock. 2013-06-06 06:17:20 +00:00
kern_exit.c Remove cr_prison NULL check from proc_to_reap. 2013-07-22 02:07:15 +00:00
kern_fail.c Mark MALLOC_DEFINEs static that have no corresponding MALLOC_DECLAREs. 2011-11-07 06:44:47 +00:00
kern_ffclock.c Revise the sysctl handling code and restructure the hierarchy of sysctls 2011-12-01 07:19:13 +00:00
kern_fork.c Include PID in the error message which is printed when the maxproc limit 2013-04-19 15:19:29 +00:00
kern_gzio.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
kern_hhook.c Move hhook's per-vnet initialisation to an earlier SYSINIT SI_SUB stage to 2013-06-15 10:08:34 +00:00
kern_idle.c On multi-core, multi-threaded PPC systems, it is important that the threads 2011-05-31 15:11:43 +00:00
kern_intr.c The change in r236456 (atomic_store_rel not locked) exposed a bug 2013-07-04 05:53:05 +00:00
kern_jail.c Refine the "nojail" rc keyword, adding "nojailvnet" for files that don't 2013-05-19 04:10:34 +00:00
kern_khelp.c Cleanup and simplification in khelp_{register|deregister}_helper(). No 2013-06-15 06:45:17 +00:00
kern_kthread.c Stop treating td_sigmask specially for the purposes of new thread 2012-05-26 20:03:47 +00:00
kern_ktr.c ktr: correctly handle possible wrap-around in the boot buffer 2013-02-08 07:29:07 +00:00
kern_ktrace.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
kern_linker.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
kern_lock.c A few mostly cosmetic nits to aid in debugging: 2013-06-25 20:23:08 +00:00
kern_lockf.c Mark MALLOC_DEFINEs static that have no corresponding MALLOC_DECLAREs. 2011-11-07 06:44:47 +00:00
kern_lockstat.c
kern_loginclass.c In order to maximize the re-usability of kernel code in user space this 2011-09-16 13:58:51 +00:00
kern_malloc.c Try to improve r242655 take III: move these SYSCTLs describing the kernel 2013-02-04 09:35:48 +00:00
kern_mbuf.c Nuke mbstat. It wasn't used for mbuf statistics since FreeBSD 5. 2013-07-15 12:18:36 +00:00
kern_mib.c fix some fat-fingering in r246246 2013-02-02 14:19:50 +00:00
kern_module.c Fix a typo. 2012-08-22 20:01:57 +00:00
kern_mtxpool.c
kern_mutex.c Fix r253823. Some WIP patches snuck in. 2013-07-30 23:50:09 +00:00
kern_ntptime.c rename scheduler->swapper and SI_SUB_RUN_SCHEDULER->SI_SUB_LAST 2013-07-24 09:45:31 +00:00
kern_osd.c
kern_physio.c Add dev_strategy_csw() function, which is similar to dev_strategy() 2013-03-27 11:34:27 +00:00
kern_pmc.c Add software PMC support. 2012-03-28 20:58:30 +00:00
kern_poll.c Increase the (arbitrary) limit for the number of packets per tick 2013-05-22 16:32:18 +00:00
kern_priv.c Make the comments a little more clear about PRIV_KMEM_*, explicitly 2013-07-06 00:10:52 +00:00
kern_proc.c Similarly to proc_getargv() and proc_getenvv(), export proc_getauxv() 2013-04-14 20:03:48 +00:00
kern_prot.c Style fix 2012-11-14 10:33:12 +00:00
kern_racct.c Accessing td_state requires thread lock to be held. 2013-03-14 23:20:18 +00:00
kern_rangelock.c Add a rangelock implementation, intended to be used to range-locking 2012-05-30 16:06:38 +00:00
kern_rctl.c Add CPU percentage limit enforcement to RCTL. The resouce name is "pcpu". 2012-10-26 16:01:08 +00:00
kern_resource.c Call sched_prio() to immediately change the priority of the thread in 2013-03-07 02:53:29 +00:00
kern_rmlock.c Fix build with INVARIANT_SUPPORT enabled but not INVARIANTS. 2013-07-08 21:17:20 +00:00
kern_rwlock.c A few mostly cosmetic nits to aid in debugging: 2013-06-25 20:23:08 +00:00
kern_sdt.c Instead of only iterating over the set of known SDT probes when sdt.ko is 2012-03-27 15:07:43 +00:00
kern_sema.c
kern_sharedpage.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
kern_shutdown.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
kern_sig.c Remove duplicate assertion from tdsendsignal. 2013-07-22 00:44:37 +00:00
kern_switch.c Add a comment on why inlining critical_enter() may not be a good idea 2012-12-09 04:54:22 +00:00
kern_sx.c A few mostly cosmetic nits to aid in debugging: 2013-06-25 20:23:08 +00:00
kern_synch.c should_yield: protect from td_swvoltick being uninitialized or too stale 2013-07-09 09:01:44 +00:00
kern_syscalls.c
kern_sysctl.c - Use strdup(9) instead of reimplementing it. 2013-03-01 18:49:14 +00:00
kern_tc.c - Make callout(9) tickless, relying on eventtimers(4) as backend for 2013-03-04 11:09:56 +00:00
kern_thr.c Stop treating td_sigmask specially for the purposes of new thread 2012-05-26 20:03:47 +00:00
kern_thread.c Another NFS SIGSTOP related fix: Ignore thread suspend requests due to 2013-03-21 14:06:27 +00:00
kern_time.c Implement compat32 wrappers for the ktimer_* syscalls. 2013-07-21 19:43:52 +00:00
kern_timeout.c Cache the callout precision argument as part of the informations required 2013-03-25 09:43:50 +00:00
kern_umtx.c Fix two issues with the spin loops in the umtx(2) implementation. 2013-06-13 09:33:22 +00:00
kern_uuid.c Further restrict the MAC addresses that we use for UUID generation 2013-07-24 18:13:43 +00:00
kern_xxx.c
ksched.c sched_rr_interval() seems always returned period in hz ticks, but same 2012-08-10 18:19:57 +00:00
link_elf_obj.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
link_elf.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
linker_if.m
Make.tags.inc - Trim an unused and bogus Makefile for mount_smbfs. 2013-06-28 21:00:08 +00:00
Makefile Continue to introduce Capsicum Capability Mode support: 2011-03-01 13:28:27 +00:00
makesyscalls.sh - Add the ffclock_getcounter(), ffclock_getestimate() and ffclock_setestimate() 2011-11-21 01:26:10 +00:00
md4c.c
md5c.c
p1003_1b.c In order to maximize the re-usability of kernel code in user space this 2011-09-16 13:58:51 +00:00
posix4_mib.c Define two new sysctl node flags: CTLFLAG_CAPRD and CTLFLAG_CAPRW, which 2011-07-17 23:05:24 +00:00
sched_4bsd.c rename scheduler->swapper and SI_SUB_RUN_SCHEDULER->SI_SUB_LAST 2013-07-24 09:45:31 +00:00
sched_ule.c Point args[0] not at the thread that is ending but at the one that 2013-04-15 17:21:02 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c Fix bug where NFSv4 ACL enforcement code wouldn't unconditionally 2012-04-17 14:54:00 +00:00
subr_acl_posix1e.c Add module load/unload stubs. 2012-03-13 20:27:48 +00:00
subr_autoconf.c Retire PCONFIG and leave the priority of thread0 alone when waiting for 2011-01-06 22:09:37 +00:00
subr_blist.c Remove reference to the rlist code from comments, and fix a typo visible 2013-02-05 20:08:33 +00:00
subr_bufring.c
subr_bus_dma.c Move an assertion to the right spot; only bus_dmamap_load_mbuf(9) 2013-06-01 11:42:47 +00:00
subr_bus.c PR: 168520 170096 2013-07-15 01:32:55 +00:00
subr_busdma_bufalloc.c Create an architecture-agnostic buffer pool manager that uses uma(9) to 2012-12-20 00:34:54 +00:00
subr_clock.c Improve style and wording of comments and sysctl descriptions [1]. 2011-01-09 14:34:56 +00:00
subr_counter.c Revert r249590 and in case if mp_ncpus isn't initialized use MAXCPU. This 2013-07-23 11:16:40 +00:00
subr_devstat.c Fix build for kernels with dtrace hooks. 2012-07-11 18:50:50 +00:00
subr_disk.c
subr_dummy_vdso_tc.c Implement mechanism to export some kernel timekeeping data to 2012-06-22 07:06:40 +00:00
subr_eventhandler.c
subr_fattime.c
subr_firmware.c Correct sizeof usage 2012-06-25 05:41:16 +00:00
subr_hash.c Convert panic()s to KASSERT()s. This is an optimisation for 2012-01-23 16:31:46 +00:00
subr_hints.c Style fixes. 2012-09-04 23:16:55 +00:00
subr_kdb.c - Extend the KDB interface to add a per-debugger callback to print a 2012-04-12 17:43:59 +00:00
subr_kobj.c As it turns out, r186347 actually is insufficient to avoid the use of the 2011-11-15 20:11:03 +00:00
subr_lock.c Several improvements to rmlock(9). Many of these are based on patches 2013-06-25 18:44:15 +00:00
subr_log.c MFcalloutng (r244255 by mav, with minor changes): 2013-03-04 16:07:55 +00:00
subr_mbpool.c
subr_mchain.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
subr_module.c Provide convenience function for obtaining MODINFO_ADDR and MODINFO_SIZE 2011-02-09 19:08:21 +00:00
subr_msgbuf.c - Clean up timestamps in msgbuf code. The timestamps should now be 2012-03-19 00:36:32 +00:00
subr_param.c Implement the concept of the unmapped VMIO buffers, i.e. buffers which 2013-03-19 14:13:12 +00:00
subr_pcpu.c Mark MALLOC_DEFINEs static that have no corresponding MALLOC_DECLAREs. 2011-11-07 06:44:47 +00:00
subr_pctrie.c - Add a new general purpose path-compressed radix trie which can be used 2013-05-12 04:05:01 +00:00
subr_power.c
subr_prf.c Fix double vision syndrome (read: double output) when in the 2011-10-16 14:16:46 +00:00
subr_prof.c Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs. 2011-11-07 15:43:11 +00:00
subr_rman.c Unlock in the error path to prevent a lock leak. 2012-05-31 17:27:05 +00:00
subr_rtc.c Core structure and functions to support a feed-forward clock within the kernel. 2011-11-19 14:10:16 +00:00
subr_sbuf.c A library function shall not set errno to 0. 2013-05-16 18:13:10 +00:00
subr_scanf.c Xen netback driver rewrite. 2012-01-26 16:35:09 +00:00
subr_sglist.c
subr_sleepqueue.c Partially revert r195702. Deferring stops is now implemented via a set of 2013-03-18 17:23:58 +00:00
subr_smp.c - Correctly handle EWOULDBLOCK in quiesce_cpus 2012-12-19 20:08:06 +00:00
subr_stack.c Constify stack argument for functions that don't modify it. 2011-11-16 19:06:55 +00:00
subr_syscall.c Fix build on ARM (and probably other platforms) 2012-12-28 06:52:53 +00:00
subr_taskqueue.c Extend taskqueue(9) to enable per-taskqueue callbacks. 2013-03-23 15:11:53 +00:00
subr_trap.c Partially revert r195702. Deferring stops is now implemented via a set of 2013-03-18 17:23:58 +00:00
subr_turnstile.c Update the comment: we do show the backtrace of misbehaving thread. 2013-02-17 21:37:32 +00:00
subr_uio.c Fix r253823. Some WIP patches snuck in. 2013-07-30 23:50:09 +00:00
subr_unit.c Correct double "the the" 2012-09-14 21:28:56 +00:00
subr_vmem.c Remove unused argument from vmem_add1(). 2013-07-24 08:02:56 +00:00
subr_witness.c Make kassert_printf use __printflike. 2013-07-07 21:39:37 +00:00
sys_capability.c Use proper malloc type for ioctls white-list. 2013-05-23 21:07:26 +00:00
sys_generic.c Help out gcc. clang understands. 2013-06-29 04:35:04 +00:00
sys_pipe.c Add pipe2() system call. 2013-05-01 22:42:42 +00:00
sys_procdesc.c Add the wait6(2) system call. It takes POSIX waitid()-like process 2012-11-13 12:52:31 +00:00
sys_process.c Switch some "low-hanging fruit" to acquire read lock on vmobjects 2013-04-08 19:58:32 +00:00
sys_socket.c Add the fo_chown and fo_chmod methods to struct fileops and use them 2011-08-16 20:07:47 +00:00
syscalls.c aio_mlock() added: 2013-06-08 13:30:13 +00:00
syscalls.master Add new system call - aio_mlock(). The name speaks for itself. It allows 2013-06-08 13:27:57 +00:00
systrace_args.c aio_mlock() added: 2013-06-08 13:30:13 +00:00
sysv_ipc.c
sysv_msg.c In order to maximize the re-usability of kernel code in user space this 2011-09-16 13:58:51 +00:00
sysv_sem.c In order to maximize the re-usability of kernel code in user space this 2011-09-16 13:58:51 +00:00
sysv_shm.c Be more aggressive in using superpages in all mappings of objects: 2013-07-19 19:06:15 +00:00
tty_compat.c
tty_info.c Fix whitespace inconsistencies in TTY code. 2012-02-06 18:15:46 +00:00
tty_inq.c Use strchr() and strrchr(). 2012-01-02 12:12:10 +00:00
tty_outq.c Fix whitespace inconsistencies in the TTY layer and its drivers owned by me. 2011-06-26 18:26:20 +00:00
tty_pts.c Allow O_CLOEXEC in posix_openpt() flags. 2013-03-21 21:39:15 +00:00
tty_tty.c Finish r210923, 210926. Mark some devices as eternal. 2011-01-04 10:59:38 +00:00
tty_ttydisc.c Correct SIGTTIN handling. 2012-10-25 09:05:21 +00:00
tty.c Merge Capsicum overhaul: 2013-03-02 00:53:12 +00:00
uipc_accf.c
uipc_cow.c Add some FEATURE macros for various features (AUDIT/CAM/IPC/KTR/MAC/NFS/NTP/ 2011-02-25 10:11:01 +00:00
uipc_debug.c
uipc_domain.c - Implement two new system calls: 2013-03-02 21:11:30 +00:00
uipc_mbuf2.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
uipc_mbuf.c Nuke mbstat. It wasn't used for mbuf statistics since FreeBSD 5. 2013-07-15 12:18:36 +00:00
uipc_mqueue.c Wrap kmq_notify(2) for compat32 to properly consume struct sigevent32 2013-07-21 19:40:30 +00:00
uipc_sem.c Similar to 233760 and 236717, export some more useful info about the 2013-05-03 21:11:57 +00:00
uipc_shm.c Use VMFS_OPTIMAL_SPACE instead of VMFS_ALIGNED_SPACE in shm_map(). 2013-07-24 20:34:25 +00:00
uipc_sockbuf.c When a previous call to sbsndptr() leaves sb->sb_sndptroff at the start of an 2013-06-19 03:08:01 +00:00
uipc_socket.c When the accept queue is full print the number of already pending 2013-05-08 14:13:14 +00:00
uipc_syscalls.c Another fix for r253823; retain the default of 1 readahead block for sendfile. 2013-07-31 15:55:01 +00:00
uipc_usrreq.c Fix receiving fd over unix socket broken in r247740. 2013-07-02 07:36:04 +00:00
vfs_acl.c Prezero the acl structure which is to be copied to usermode, to avoid 2013-02-06 15:18:46 +00:00
vfs_aio.c Move the convert_sigevent32() utility function into freebsd32_misc.c 2013-07-21 19:33:48 +00:00
vfs_bio.c Assert that runningbufspace does not underflow. 2013-07-13 19:36:18 +00:00
vfs_cache.c namecache sdt: freebsd doesn't support structured characters yet 2013-07-09 08:58:34 +00:00
vfs_cluster.c - Convert the bufobj lock to rwlock. 2013-05-31 00:43:41 +00:00
vfs_default.c - Convert the bufobj lock to rwlock. 2013-05-31 00:43:41 +00:00
vfs_export.c Further refine the handling of stop signals in the NFS client. The 2013-02-21 19:02:50 +00:00
vfs_extattr.c Use a shared lock for VOP_GETEXTATTR, as it is a read-like operation. 2013-03-30 15:09:04 +00:00
vfs_hash.c Add exported vfs_hash_index() function, which calculates the canonical 2013-01-14 05:41:40 +00:00
vfs_init.c Revert accidental commit. 2013-06-29 05:05:57 +00:00
vfs_lookup.c Do not call the VOP_LOOKUP() for the doomed directory vnode. The 2013-04-01 09:59:38 +00:00
vfs_mount.c Add vfs_mounted and vfs_unmounted events so that components can be informed 2013-07-10 15:35:25 +00:00
vfs_mountroot.c Changes to allow using BOOTP_NFSROOT and mounting an nfs root filesystem 2013-07-31 19:14:00 +00:00
vfs_subr.c When creation of the v_pollinfo raced and our instance of vpollinfo 2013-07-28 06:59:29 +00:00
vfs_syscalls.c - Fix nullfs vnode reference leak in nullfs_reclaim_lowervp(). The 2013-05-11 11:17:44 +00:00
vfs_vnops.c There are several code sequences like 2013-07-09 20:49:32 +00:00
vnode_if.src remove vop_lookup_pre and vop_lookup_post 2012-11-22 10:36:10 +00:00