Konstantin Belousov 714b7df502 Provide simple mutual exclusion between mount point update and unmount. ...

Currently mount update keeps vfs_busy(9) reference on the mount point
during MNT_UPDATE VFS_MOUNT() vfsops call.  This already provides the
exclusion, but is problematic for filesystems which need to perform
namei(9) during VFS_MOUNT(MNT_UPDATE) operations, e.g. to refresh
mnt_from path, because namei(9) must not be called while the
vfs_busy(9) reference is owned.

Check for MNT_UPDATE flag before setting MNTK_UNMOUNT, and for
MNTK_UNMOUNT before entering innards of vfs_domount_update(), failing
syscalls with EBUSY if conflict is detected.  Keep vfs_busy(9)
reference around VFS_MOUNT(MNT_UPDATE) calls still to not change VFS
KPI.

In the update path in ffs_mount(), drop vfs_busy() reference around
namei(), which is now safe due to unmount never executing in parallel
with VFS_MOUNT(MNT_UPDATE), and which avoids the deadlock.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks

2016-11-13 21:49:51 +00:00

..

bus_if.m

INTRNG: Rework handling with resources. Partially revert r301453.

2016-08-19 10:52:39 +00:00

capabilities.conf

Update capabilities.conf comment

2016-09-08 14:04:04 +00:00

clock_if.m

…

cpufreq_if.m

…

device_if.m

Import the 'iflib' API library for network drivers. From the author:

2016-05-18 04:35:58 +00:00

genassym.sh

…

imgact_aout.c

Implement vsyscall hack. Prior to 2.13 glibc uses vsyscall

2016-01-09 20:18:53 +00:00

imgact_binmisc.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

imgact_elf32.c

…

imgact_elf64.c

…

imgact_elf.c

Style.

2016-10-04 15:23:03 +00:00

imgact_gzip.c

…

imgact_shell.c

…

inflate.c

ANSIfy inflate.c

2016-10-04 17:57:30 +00:00

init_main.c

Fix improper use of "its".

2016-11-08 23:59:41 +00:00

init_sysent.c

Regnerate after r305140, getdtablesize in capability mode

2016-08-31 18:37:51 +00:00

kern_acct.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_alq.c

Use SI_SUB_LAST instead of SI_SUB_SMP as the "catch-all" subsystem.

2016-03-11 23:18:06 +00:00

kern_clock.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_clocksource.c

Add an EARLY_AP_STARTUP option to start APs earlier during boot.

2016-05-14 18:22:52 +00:00

kern_condvar.c

cv: do a lockless check for no waiters in cv_signal and cv_broadcastpri

2016-09-06 17:16:59 +00:00

kern_conf.c

Provide yet another KPI for cdev creation, make_dev_s(9).

2016-01-07 20:08:02 +00:00

kern_cons.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_context.c

…

kern_cpu.c

Add an EARLY_AP_STARTUP option to start APs earlier during boot.

2016-05-14 18:22:52 +00:00

kern_cpuset.c

Add more fine-grained kernel options for NUMA support.

2016-04-09 13:58:04 +00:00

kern_ctf.c

Fix improper use of "its".

2016-11-08 23:59:41 +00:00

kern_descrip.c

Give the user a clue as to which process hit maxfiles.

2016-09-24 22:56:13 +00:00

kern_dtrace.c

…

kern_dump.c

kernel: use our nitems() macro when it is available through param.h.

2016-04-19 23:48:27 +00:00

kern_environment.c

Create wrappers for uint64_t and int64_t for the tunables. While not

2016-04-15 03:09:55 +00:00

kern_et.c

…

kern_event.c

Another issue reported on http://seclists.org/oss-sec/2016/q3/68 is

2016-07-16 13:24:58 +00:00

kern_exec.c

Mark a bunch of mpsafe sysctls as such.

2016-10-19 19:42:01 +00:00

kern_exit.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_fail.c

Fix some cosmetic issues in kern_fail.c omitted from r296927.

2016-06-09 13:17:08 +00:00

kern_ffclock.c

kernel: use our nitems() macro when it is available through param.h.

2016-04-19 23:48:27 +00:00

kern_fork.c

Add PROC_TRAPCAP procctl(2) controls and global sysctl kern.trap_enocap.

2016-09-21 08:23:33 +00:00

kern_gzio.c

…

kern_hhook.c

Get closer to a VIMAGE network stack teardown from top to bottom rather

2016-06-21 13:48:49 +00:00

kern_idle.c

…

kern_intr.c

…

kern_jail.c

Move IPv4-specific jail functions to new file netinet/in_jail.c

2016-08-09 02:16:21 +00:00

kern_khelp.c

…

kern_kthread.c

Re-schedule signals after kthread exits, since apparently there are

2016-08-10 13:47:12 +00:00

kern_ktr.c

Fix the logic in the ddb command 'show ktr /a'. Prior to r118269 it would

2016-01-31 17:32:20 +00:00

kern_ktrace.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_linker.c

kern_linker: Handle module-loading failures in preloaded .ko files

2016-10-13 02:06:23 +00:00

kern_lock.c

Microoptimize locking primitives by avoiding unnecessary atomic ops.

2016-06-01 18:32:20 +00:00

kern_lockf.c

Fix LINT building.

2016-09-18 07:37:00 +00:00

kern_lockstat.c

…

kern_loginclass.c

Speed up rctl operation with large rulesets, by holding the lock

2015-11-15 12:10:51 +00:00

kern_malloc.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_mbuf.c

Import the 'iflib' API library for network drivers. From the author:

2016-05-18 04:35:58 +00:00

kern_mib.c

Mark a bunch of mpsafe sysctls as such.

2016-10-19 19:42:01 +00:00

kern_module.c

…

kern_mtxpool.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

kern_mutex.c

Make no assertions about mutex state when the scheduler is stopped.

2016-09-26 15:30:30 +00:00

kern_ntptime.c

Fix a bug in r302252.

2016-07-27 11:40:06 +00:00

kern_numa.c

…

kern_osd.c

osd(9): Change array pointer to array pointer type from void*

2016-04-26 19:57:35 +00:00

kern_physio.c

Add four new RCTL resources - readbps, readiops, writebps and writeiops,

2016-04-07 04:23:25 +00:00

kern_pmc.c

…

kern_poll.c

…

kern_priv.c

…

kern_proc.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_procctl.c

Add the foundation copyrights to procctl kernel sources.

2016-09-23 12:32:20 +00:00

kern_prot.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_racct.c

Get rid of rctl_lock; use racct_lock where appropriate. The fast paths

2016-04-21 16:22:52 +00:00

kern_rangelock.c

…

kern_rctl.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

kern_resource.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_rmlock.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

kern_rwlock.c

locks: fix compilation for KDTRACE_HOOKS && !ADAPTIVE_* case

2016-08-02 03:05:59 +00:00

kern_sdt.c

…

kern_sema.c

…

kern_sendfile.c

Fix regression from r297400, which truncates headers in case of low socket

2016-09-22 20:34:44 +00:00

kern_sharedpage.c

Split kerne timekeep ABI structure vdso_sv_tk out of the struct

2015-11-23 07:09:35 +00:00

kern_shutdown.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_sig.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_switch.c

…

kern_sx.c

locks: fix sx compilation on mips after r303643

2016-08-03 09:15:10 +00:00

kern_synch.c

Remove remnants of the recursive sleep support. Instead assert that

2016-11-02 20:57:20 +00:00

kern_syscalls.c

…

kern_sysctl.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_tc.c

Implement userspace gettimeofday(2) with HPET timecounter.

2016-08-17 09:52:09 +00:00

kern_thr.c

Add a mask of optional ptrace() events.

2016-07-15 15:32:09 +00:00

kern_thread.c

Rewrite subr_sleepqueue.c use of callouts to not depend on the

2016-07-28 09:09:55 +00:00

kern_time.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_timeout.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

kern_umtx.c

In both do_rw_wrlock() and do_rw_rdlock() after r304808, do not

2016-08-25 19:15:02 +00:00

kern_uuid.c

…

kern_xxx.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

ksched.c

…

link_elf_obj.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

link_elf.c

kern: for pointers replace 0 with NULL.

2016-04-15 16:10:11 +00:00

linker_if.m

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

Make.tags.inc

Bring the tags and links entries for amd64 up to date.

2015-10-27 22:59:24 +00:00

Makefile

Don't create pointless backups of generated files in "make sysent".

2016-07-28 21:29:04 +00:00

makesyscalls.sh

makesyscalls.sh: remove trailing space on the "created from" line

2016-10-17 13:52:24 +00:00

md4c.c

crypto routines: Hint minimum buffer sizes to the compiler

2016-05-26 19:29:29 +00:00

md5c.c

crypto routines: Hint minimum buffer sizes to the compiler

2016-05-26 19:29:29 +00:00

msi_if.m

Introduce MSI and MSI-X support to intrng. This adds a new msi device

2016-05-16 09:11:40 +00:00

p1003_1b.c

…

pic_if.m

INTRNG: Rework handling with resources. Partially revert r301453.

2016-08-19 10:52:39 +00:00

posix4_mib.c

posix4_mib: Don't overrun facility_initialized array

2016-04-27 00:10:32 +00:00

sched_4bsd.c

Allow scheduling during early boot.

2016-11-12 00:23:09 +00:00

sched_ule.c

Get rid of struct proc p_sched and struct thread td_sched pointers.

2016-06-05 17:04:03 +00:00

serdev_if.m

…

stack_protector.c

…

subr_acl_nfs4.c

…

subr_acl_posix1e.c

…

subr_autoconf.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_blist.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_bufring.c

…

subr_bus_dma.c

Fix a bug introduced in r291716:

2016-01-11 20:38:39 +00:00

subr_bus.c

Add two new ddb commands: show device/show all devices

2016-11-13 00:46:11 +00:00

subr_busdma_bufalloc.c

Fix printf format to allow for bus_size_t not being u_long on all platforms.

2015-10-20 03:25:17 +00:00

subr_capability.c

capsicum: plug spurious memset in __cap_rights_init

2015-12-01 02:48:42 +00:00

subr_clock.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_counter.c

Free the temporary buffer in sysctl_handle_counter_u64_array().

2016-03-15 00:21:32 +00:00

subr_devmap.c

Include machine/acle-compat.h in cdefs.h on arm if the compiler doesn't

2016-05-25 19:44:26 +00:00

subr_devstat.c

Add support for managing Shingled Magnetic Recording (SMR) drives.

2016-05-19 14:08:36 +00:00

subr_disk.c

…

subr_dummy_vdso_tc.c

…

subr_eventhandler.c

…

subr_fattime.c

…

subr_firmware.c

Fix improper use of "its".

2016-11-08 23:59:41 +00:00

subr_gtaskqueue.c

Resolve whitespace diff to NextBSD.

2016-10-19 21:01:24 +00:00

subr_hash.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_hints.c

…

subr_intr.c

INTRNG - fix MSI/MSIX release path

2016-10-11 17:00:29 +00:00

subr_kdb.c

…

subr_kobj.c

…

subr_lock.c

Implement trivial backoff for locking primitives.

2016-08-01 21:48:37 +00:00

subr_log.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_mbpool.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

subr_mchain.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_module.c

…

subr_msgbuf.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

subr_param.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_pcpu.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_pctrie.c

sys: extend use of the howmany() macro when available.

2016-04-26 15:38:17 +00:00

subr_power.c

…

subr_prf.c

Include <stdarg.h> instead of <machine/stdarg.h> when compiled as

2016-10-24 18:03:04 +00:00

subr_prof.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_rman.c

Add new bus methods for mapping resources.

2016-05-20 17:57:47 +00:00

subr_rtc.c

Make resettodr_lock accessible outside subr_rtc.c. Protect

2016-09-21 10:15:08 +00:00

subr_sbuf.c

…

subr_scanf.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

subr_sfbuf.c

…

subr_sglist.c

Add sglist functions for working with arrays of VM pages.

2016-05-20 23:28:43 +00:00

subr_sleepqueue.c

Micro-optimize sleepq_signal().

2016-09-04 00:29:48 +00:00

subr_smp.c

Handle broadcast NMIs.

2016-10-24 16:40:27 +00:00

subr_stack.c

Add support for a configurable output channel to witness(4).

2015-11-19 05:56:59 +00:00

subr_syscall.c

Add PROC_TRAPCAP procctl(2) controls and global sysctl kern.trap_enocap.

2016-09-21 08:23:33 +00:00

subr_taskqueue.c

While draining a timeout task prevent the taskqueue_enqueue_timeout()

2016-09-29 10:38:20 +00:00

subr_terminal.c

…

subr_trap.c

The assertion re-added in r302614 was triggered when stopping signal

2016-07-18 10:53:47 +00:00

subr_turnstile.c

ddb(4): Add sleepchains to "show allchains"

2016-10-22 18:02:20 +00:00

subr_uio.c

In the fueword64(9) wrapper for architectures which do not implemented

2016-10-23 11:23:17 +00:00

subr_unit.c

Fix build of kern/subr_unit.c, broken by r300539

2016-05-24 00:14:58 +00:00

subr_vmem.c

subr_vmem: Fix double-free in error case of vmem_create

2016-05-11 23:16:11 +00:00

subr_witness.c

Fix WITNESS hints for pagequeue locks.

2016-10-29 20:01:48 +00:00

sys_capability.c

capsicum: perform copyout without the fildesc lock held in sys_cap_ioctls_get

2016-10-21 16:12:23 +00:00

sys_generic.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

sys_pipe.c

Generate syscall tables and update pipe() implementation after r302094.

2016-06-22 21:18:19 +00:00

sys_procdesc.c

Hide the boottime and bootimebin globals, provide the getboottime(9)

2016-07-27 11:08:59 +00:00

sys_process.c

Don't set P2_PTRACE_FSTP in a process that invokes ptrace(PT_TRACE_ME).

2016-08-19 17:57:14 +00:00

sys_socket.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

syscalls.c

Remove the obsolete and unused openbsd_poll system call. (Phase 2)

2016-08-18 10:54:39 +00:00

syscalls.master

Remove unusedd and obsolete openbsd_poll system call. (Phase 1)

2016-08-18 10:50:40 +00:00

systrace_args.c

Regenerate syscall provider argument strings.

2016-09-22 04:50:03 +00:00

sysv_ipc.c

…

sysv_msg.c

Remove a comment that was part of copied code, and is misleading in

2016-06-09 15:34:33 +00:00

sysv_sem.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

sysv_shm.c

Add shmatt_t.

2016-07-26 17:23:49 +00:00

tty_compat.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

tty_info.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

tty_inq.c

…

tty_outq.c

…

tty_pts.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

tty_tty.c

…

tty_ttydisc.c

Don't clear the software flow control flag before draining for last

2016-01-26 14:46:39 +00:00

tty.c

sys/kern: spelling fixes in comments.

2016-04-29 22:15:33 +00:00

uipc_accf.c

Use correct size type in do_setopt_accept_filter

2016-10-12 00:56:49 +00:00

uipc_debug.c

Refactor the AIO subsystem to permit file-type-specific handling and

2016-03-01 18:12:14 +00:00

uipc_domain.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

uipc_mbuf2.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

uipc_mbuf.c

Fix improper use of "its".

2016-11-08 23:59:41 +00:00

uipc_mbufhash.c

…

uipc_mqueue.c

Use the new PR_METHOD_REMOVE to clean up jail handling in POSIX

2016-04-25 04:36:54 +00:00

uipc_sem.c

Clean up some style(9) violations.

2016-04-14 17:07:26 +00:00

uipc_shm.c

Eliminate unneeded vm_page_xbusy() and vm_page_xunbusy() operations when

2016-08-14 22:00:45 +00:00

uipc_sockbuf.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

uipc_socket.c

Adjust the sopt_val pointer on bigendian systems (e.g. MIPS64EB).

2016-09-22 12:41:53 +00:00

uipc_syscalls.c

Rework r306337.

2016-10-21 18:27:30 +00:00

uipc_usrreq.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

vfs_acl.c

…

vfs_aio.c

Remove duplicated code.

2016-08-17 10:14:22 +00:00

vfs_bio.c

Tweaks for the buffer pager.

2016-11-08 10:10:55 +00:00

vfs_cache.c

vn_fullpath1() checked VV_ROOT and then unreferenced

2016-11-07 10:55:56 +00:00

vfs_cluster.c

Add BUF_TRACKING and FULL_BUF_TRACKING buffer debugging

2016-10-31 23:09:52 +00:00

vfs_default.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

vfs_export.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

vfs_extattr.c

…

vfs_hash.c

Add vfs_hash_ref(9) function, which finds a vnode by the hash value

2016-05-11 06:32:22 +00:00

vfs_init.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

vfs_lookup.c

Allow some dotdot lookups in capability mode.

2016-11-02 12:43:15 +00:00

vfs_mount.c

Provide simple mutual exclusion between mount point update and unmount.

2016-11-13 21:49:51 +00:00

vfs_mountroot.c

Limit scope of the optimization in r306608 to dounmount() caller only.

2016-10-07 11:38:28 +00:00

vfs_subr.c

vfs: clear the tmp free list flag before taking the free vnode list lock

2016-10-08 13:36:59 +00:00

vfs_syscalls.c

Allow some dotdot lookups in capability mode.

2016-11-02 12:43:15 +00:00

vfs_vnops.c

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00

vnode_if.src

Renumber license clauses in sys/kern to avoid skipping #3

2016-09-15 13:16:20 +00:00