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5fc3031366
freebsd-nq/sys/kern
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John Baldwin 5fc3031366 - Change falloc() to acquire an fd from the process table last so that 
it can do it w/o needing to hold the filelist_lock sx lock.
- fdalloc() doesn't need Giant to call free() anymore.  It also doesn't
  need to drop and reacquire the filedesc lock around free() now as a
  result.
- Try to make the code that copies fd tables when extending the fd table in
  fdalloc() a bit more readable by performing assignments in separate
  statements.  This is still a bit ugly though.
- Use max() instead of an if statement so to figure out the starting point
  in the search-for-a-free-fd loop in fdalloc() so it reads better next to
  the min() in the previous line.
- Don't grow nfiles in steps up to the size needed if we dup2() to some
  really large number.  Go ahead and double 'nfiles' in a loop prior
  to doing the malloc().
- malloc() doesn't need Giant now.
- Use malloc() and free() instead of MALLOC() and FREE() in fdalloc().
- Check to see if the size we are going to grow to is too big, not if the
  current size of the fd table is too big in the loop in fdalloc().  This
  means if we are out of space or if dup2() requests too high of a fd,
  then we will return an error before we go off and try to allocate some
  huge table and copy the existing table into it.
- Move all of the logic for dup'ing a file descriptor into do_dup() instead
  of putting some of it in do_dup() and duplicating other parts in four
  different places.  This makes dup(), dup2(), and fcntl(F_DUPFD) basically
  wrappers of do_dup now.  fcntl() still has an extra check since it uses
  a different error return value in one case then the other functions.
- Add a KASSERT() for an assertion that may not always be true where the
  fdcheckstd() function assumes that falloc() returns the fd requested and
  not some other fd.  I think that the assertion is always true because we
  are always single-threaded when we get to this point, but if one was
  using rfork() and another process sharing the fd table were playing with
  the fd table, there might could be a problem.
- To handle the problem of a file descriptor we are dup()'ing being closed
  out from under us in dup() in general, do_dup() now obtains a reference
  on the file in question before calling fdalloc().  If after the call to
  fdalloc() the file for the fd we are dup'ing is a different file, then
  we drop our reference on the original file and return EBADF.  This
  race was only handled in the dup2() case before and would just retry
  the operation.  The error return allows the user to know they are being
  stupid since they have a locking bug in their app instead of dup'ing
  some other descriptor and returning it to them.

Tested on:	i386, alpha, sparc64
2002-09-03 20:16:31 +00:00
..
bus_if.m Add bus_child_present and the child_present method to bus_if.m 2002-07-21 03:28:43 +00:00
clock_if.m Add a generic implementation of inittodr() and resettodr(), as well as 2002-04-04 23:39:10 +00:00
device_if.m
genassym.sh Allow one to specify the AWK used in the environment(commandline). 2002-02-11 03:54:30 +00:00
imgact_aout.c Added fields for VM_MIN_ADDRESS, PS_STRINGS and stack protections to 2002-09-01 21:41:24 +00:00
imgact_elf32.c Infrastructure tweaks to allow having both an Elf32 and an Elf64 executable 2002-07-20 02:56:12 +00:00
imgact_elf64.c Infrastructure tweaks to allow having both an Elf32 and an Elf64 executable 2002-07-20 02:56:12 +00:00
imgact_elf.c Grammer cleanup 2002-09-02 17:27:30 +00:00
imgact_elfN.c Infrastructure tweaks to allow having both an Elf32 and an Elf64 executable 2002-07-20 02:56:12 +00:00
imgact_gzip.c Infrastructure tweaks to allow having both an Elf32 and an Elf64 executable 2002-07-20 02:56:12 +00:00
imgact_shell.c Return a more meaningful errno when the length of the interpreter 2001-11-28 03:26:58 +00:00
inflate.c Modernize my email address. 2002-03-25 13:52:45 +00:00
init_main.c Added fields for VM_MIN_ADDRESS, PS_STRINGS and stack protections to 2002-09-01 21:41:24 +00:00
init_sysent.c Regen. 2002-08-19 20:02:29 +00:00
kern_acct.c In order to better support flexible and extensible access control, 2002-08-15 20:55:08 +00:00
kern_acl.c Introduce support for Mandatory Access Control and extensible 2002-08-01 01:04:16 +00:00
kern_clock.c Fixed breakage of binary compatibility of the kern.clockrate sysctl in 2002-05-05 04:33:09 +00:00
kern_condvar.c fix bogus CTR3 message. 2002-09-02 07:55:06 +00:00
kern_conf.c Break the following implementation of panic(3): 2002-04-25 13:17:33 +00:00
kern_descrip.c - Change falloc() to acquire an fd from the process table last so that 2002-09-03 20:16:31 +00:00
kern_environment.c Cosmetic tweaks. Try and keep the style more consistent, catch some stray 2002-05-01 02:51:50 +00:00
kern_event.c In continuation of early fileop credential changes, modify fo_ioctl() to 2002-08-17 02:36:16 +00:00
kern_exec.c Added fields for VM_MIN_ADDRESS, PS_STRINGS and stack protections to 2002-09-01 21:41:24 +00:00
kern_exit.c Revert previous revision which accidentally snuck in with another commit. 2002-08-01 13:44:33 +00:00
kern_fork.c slight cleanup of single-threading code for KSE processes 2002-08-22 21:45:58 +00:00
kern_idle.c Slight cleanup of some comments/whitespace. 2002-08-01 18:45:10 +00:00
kern_intr.c Slight cleanup of some comments/whitespace. 2002-08-01 18:45:10 +00:00
kern_jail.c The jail syscall calls chroot, which is not mpsafe, so put back a 2002-07-01 20:46:01 +00:00
kern_kse.c In the kernel code, we have the tsleep() call with the PCATCH argument. 2002-09-03 12:56:01 +00:00
kern_kthread.c Part 1 of KSE-III 2002-06-29 17:26:22 +00:00
kern_ktr.c Remove a stale comment. 2002-04-06 08:44:04 +00:00
kern_ktrace.c Pass active_cred and file_cred into the MAC framework explicitly 2002-08-19 19:04:53 +00:00
kern_linker.c In order to better support flexible and extensible access control, 2002-08-15 20:55:08 +00:00
kern_lock.c Include <sys/lockmgr.h> for the definitions of the locking interfaces that 2002-08-27 09:59:47 +00:00
kern_lockf.c Add a #include for <sys/mount.h> 2002-08-13 10:07:05 +00:00
kern_mac.c Close a race in process label changing opened due to dropping the 2002-08-19 20:26:32 +00:00
kern_malloc.c - Replace the bandaid introduced in revision 1.110 with 2002-05-31 09:41:09 +00:00
kern_mib.c - Add a mutex to lock the global securelevel value. 2002-04-02 17:43:17 +00:00
kern_module.c - Remove Giant acquisition from modevent(), modfnext(), modstat() and 2002-06-26 00:31:44 +00:00
kern_mtxpool.c Change callers of mtx_init() to pass in an appropriate lock type name. In 2002-04-04 21:03:38 +00:00
kern_mutex.c Add some KASSERT()'s to ensure that we don't perform spin mutex ops on 2002-09-03 18:25:16 +00:00
kern_ntptime.c Hide the private parts of timecounter from a couple of places that don't 2002-04-26 21:31:44 +00:00
kern_physio.c More caddr_t removal, make fo_ioctl take a void * instead of a caddr_t. 2002-06-29 01:50:25 +00:00
kern_poll.c Increase size of ifnet.if_flags from 16 bits (short) to 32 bits (int). To avoid 2002-08-18 07:05:00 +00:00
kern_proc.c Fix typos; each file has at least one s/seperat/separat/ 2002-08-11 13:05:30 +00:00
kern_prot.c Include file cleanup; mac.h and malloc.h at one point had ordering 2002-08-01 17:47:56 +00:00
kern_resource.c Widen struct sockbuf's sb_timeo member to int from short. With 2002-07-24 03:02:43 +00:00
kern_sema.c Change callers of mtx_init() to pass in an appropriate lock type name. In 2002-04-04 21:03:38 +00:00
kern_shutdown.c Revert previous revision which was accidentally committed and has not been 2002-08-01 13:39:33 +00:00
kern_sig.c In the kernel code, we have the tsleep() call with the PCATCH argument. 2002-09-03 12:56:01 +00:00
kern_subr.c o Convert a vm_page_sleep_busy() into a vm_page_sleep_if_busy() 2002-08-04 06:27:37 +00:00
kern_switch.c Rejig the code to figure out estcpu and work out how long a KSEGRP has been 2002-08-30 00:25:49 +00:00
kern_sx.c Set the lock type equal to the lock name for now as all of the current 2002-04-04 20:49:35 +00:00
kern_synch.c Rejig the code to figure out estcpu and work out how long a KSEGRP has been 2002-08-30 00:25:49 +00:00
kern_syscalls.c - Lock down the ``module'' structure by adding an SX lock that is used by 2002-03-18 07:45:30 +00:00
kern_sysctl.c Introduce a new sysctl flag, CTLFLAG_SKIP, which will cause 2002-08-10 19:56:45 +00:00
kern_tc.c Use a semicolon at the end of a function-like macro invocation. Kills 2002-07-15 13:13:04 +00:00
kern_thread.c In the kernel code, we have the tsleep() call with the PCATCH argument. 2002-09-03 12:56:01 +00:00
kern_time.c A side effect of some debugging: prototypify and deregister. 2002-08-18 21:24:22 +00:00
kern_timeout.c Change callers of mtx_init() to pass in an appropriate lock type name. In 2002-04-04 21:03:38 +00:00
kern_uuid.c Include <sys/systm.h> for the declarations of many things instead of 2002-08-22 12:47:22 +00:00
kern_xxx.c more caddr_t removal. 2002-06-29 02:00:02 +00:00
ksched.c Part 1 of KSE-III 2002-06-29 17:26:22 +00:00
link_elf_obj.c Unrot SPARSE_MAPPING code (vm_map_pageable -> vm_map_wire). 2002-08-29 01:16:14 +00:00
link_elf.c Unrot SPARSE_MAPPING code (vm_map_pageable -> vm_map_wire). 2002-08-29 01:16:14 +00:00
linker_if.m Add the sysctl "kern.function_list", which currently exports all 2001-10-30 15:21:45 +00:00
Make.tags.inc Don't hardcode /sys when making tags, instead use ${.CURDIR}/.. this 2002-02-27 10:07:15 +00:00
Makefile Don't generate <sys/syscalls-hide.h> it has never had any users anywhere in 2001-10-13 09:17:49 +00:00
makesyscalls.sh Introduce syscall.master option 'COMPAT4' which allows one to wrap 2002-07-12 06:38:34 +00:00
md4c.c
md5c.c Bring sys/kern/md5c.c in sync with the userland version. 2002-06-24 14:15:25 +00:00
p1003_1b.c Change p_can{debug,see,sched,signal}()'s first argument to be a thread 2002-05-19 00:14:50 +00:00
posix4_mib.c
subr_acl_posix1e.c Introduce support for Mandatory Access Control and extensible 2002-08-01 01:04:16 +00:00
subr_autoconf.c Remove __P. 2002-03-19 21:25:46 +00:00
subr_blist.c Now that daddr_t has grown up, use %lld to printf it and cast it to long 2002-05-18 23:46:04 +00:00
subr_bus.c Add bus_child_present and the child_present method to bus_if.m 2002-07-21 03:28:43 +00:00
subr_clist.c Remove __P. 2002-03-19 21:25:46 +00:00
subr_clock.c Use the CPU_* OID constants instead of OID_AUTO for the clock-related 2002-08-07 19:43:54 +00:00
subr_devstat.c GC: BIO_ORDERED, various infrastructure dealing with BIO_ORDERED. 2002-02-22 09:26:35 +00:00
subr_disk.c Don't use "NULL" when "0" is really meant. 2002-08-21 23:39:52 +00:00
subr_disklabel.c more caddr_t removal. 2002-06-29 02:00:02 +00:00
subr_diskmbr.c Remove __P. 2002-03-19 21:25:46 +00:00
subr_diskslice.c Fix DIOCGMEDIASIZE and DIOCGSECTORSIZE ioctls to work for all 2002-07-23 14:30:27 +00:00
subr_eventhandler.c Wrap a line longer than 80 characters. 2002-07-19 17:44:44 +00:00
subr_hints.c Cosmetic tweaks. Try and keep the style more consistent, catch some stray 2002-05-01 02:51:50 +00:00
subr_kobj.c Convert hit and miss counters to unsigned values. Surely negative values 2002-06-10 22:40:26 +00:00
subr_log.c more caddr_t removal. 2002-06-29 02:00:02 +00:00
subr_mbuf.c Make m_flags an int instead of a short, this is consistent with the 2002-08-15 14:09:16 +00:00
subr_mchain.c Convert GNU-styled variadic macros to ISO(9x) style. 2002-07-15 13:15:31 +00:00
subr_module.c
subr_param.c Change hw.physmem and hw.usermem to unsigned long like they used to be 2002-08-30 04:04:37 +00:00
subr_pcpu.c Add a per-cpu variable, cpumask, the preshifted equivalent of 1 << cpuid. 2002-01-05 09:35:50 +00:00
subr_power.c Use ISO 9X variadic macro format; arguments are not optional, just 2002-07-15 17:17:56 +00:00
subr_prf.c Make kern.log_console_output a tuneable aswell as a sysctl. 2002-08-11 18:47:42 +00:00
subr_prof.c more caddr_t removal. 2002-06-29 02:00:02 +00:00
subr_rman.c Add sanity check seeing if adjusted start address exceeds end address 2002-08-29 12:39:21 +00:00
subr_rtc.c Use the CPU_* OID constants instead of OID_AUTO for the clock-related 2002-08-07 19:43:54 +00:00
subr_sbuf.c Fix warnings on gcc-3.1+ where __func__ is a const char * instead of a 2002-03-19 10:56:46 +00:00
subr_scanf.c
subr_smp.c Part 1 of KSE-III 2002-06-29 17:26:22 +00:00
subr_taskqueue.c If we fail to write to a vnode during a ktrace write, then we drop all 2002-08-01 13:35:38 +00:00
subr_trap.c Spell proprly properly: 2002-08-22 14:36:03 +00:00
subr_turnstile.c Add some KASSERT()'s to ensure that we don't perform spin mutex ops on 2002-09-03 18:25:16 +00:00
subr_witness.c Add WITNESS_FILE() and WITNESS_LINE(), which allow users of witness 2002-08-26 18:31:26 +00:00
subr_xxx.c Here follows the new kernel dumping infrastructure. 2002-03-31 22:37:00 +00:00
sys_generic.c Split out a number of mostly VFS and signal related syscalls into 2002-09-01 20:37:28 +00:00
sys_pipe.c Don't use "NULL" when "0" is really meant. 2002-08-21 23:39:52 +00:00
sys_process.c Replace various spelling with FALLTHROUGH which is lint()able 2002-08-25 13:23:09 +00:00
sys_socket.c In continuation of early fileop credential changes, modify fo_ioctl() to 2002-08-17 02:36:16 +00:00
syscalls.c Regen. 2002-08-19 20:02:29 +00:00
syscalls.master mac_syscall is now implemented, switch to MSTD. 2002-08-19 20:01:31 +00:00
sysv_ipc.c Change the suser() API to take advantage of td_ucred as well as do a 2002-04-01 21:31:13 +00:00
sysv_msg.c Make SYSVMSG mpsafe. Right now there is a global lock over the 2002-08-13 08:00:36 +00:00
sysv_sem.c Make SYSVSEM mpsafe. Each semaphore set gets its own lock, however 2002-08-13 08:47:17 +00:00
sysv_shm.c return foo -> return (foo) 2002-08-15 02:10:12 +00:00
tty_compat.c Fixed some style bugs in the removal of __P(()). The main ones were 2002-03-24 05:09:11 +00:00
tty_conf.c KSE Milestone 2 2001-09-12 08:38:13 +00:00
tty_cons.c Remove new console devices with cnremove before initializing them in 2002-08-06 18:56:41 +00:00
tty_pty.c - Lock proctree_lock instead of pgrpsess_lock. 2002-04-16 17:09:22 +00:00
tty_subr.c Remove __P. 2002-03-19 21:25:46 +00:00
tty_tty.c Pass active_cred and file_cred into the MAC framework explicitly 2002-08-19 19:04:53 +00:00
tty.c Clear up confusion in ugly code. ^T gave wrong results for RSS. 2002-07-18 21:19:56 +00:00
uipc_accf.c
uipc_cow.c o Synchronize updates to struct vm_page::cow with the page queues lock. 2002-09-02 04:04:12 +00:00
uipc_domain.c Back out my lats commit of locking down a socket, it conflicts with hsu's work. 2002-05-31 11:52:35 +00:00
uipc_jumbo.c o Lock page queue accesses by vm_page_free(). 2002-07-21 19:06:46 +00:00
uipc_mbuf2.c In m_aux_delete, no need to chase beyond victim. 2002-05-23 15:59:48 +00:00
uipc_mbuf.c Include file cleanup; mac.h and malloc.h at one point had ordering 2002-08-01 17:47:56 +00:00
uipc_proto.c
uipc_sockbuf.c Further improved the performance of sbreserve() by moving the calculation 2002-08-16 18:41:48 +00:00
uipc_socket2.c Further improved the performance of sbreserve() by moving the calculation 2002-08-16 18:41:48 +00:00
uipc_socket.c Make similar changes to fo_stat() and fo_poll() as made earlier to 2002-08-16 12:52:03 +00:00
uipc_syscalls.c accept(2) on a socket that has been shutdown(2) normally returns 2002-08-28 20:56:01 +00:00
uipc_usrreq.c Introduce support for Mandatory Access Control and extensible 2002-08-01 01:18:42 +00:00
vfs_acl.c Introduce support for Mandatory Access Control and extensible 2002-08-01 01:04:16 +00:00
vfs_aio.c Replace (ab)uses of "NULL" where "0" is really meant. 2002-08-22 21:24:01 +00:00
vfs_bio.c Change hw.physmem and hw.usermem to unsigned long like they used to be 2002-08-30 04:04:37 +00:00
vfs_cache.c Split up __getcwd so that kernel callers of the internal version 2002-09-02 22:40:30 +00:00
vfs_cluster.c Replace various spelling with FALLTHROUGH which is lint()able 2002-08-25 13:23:09 +00:00
vfs_default.c Remember to unlock the (optional) vnode in vfs_stdextattrctl(). Failing 2002-08-13 11:11:51 +00:00
vfs_export.c Partial backout of 1.318, remove error handling added because it may be 2002-06-30 05:23:58 +00:00
vfs_extattr.c Split out a number of mostly VFS and signal related syscalls into 2002-09-01 20:37:28 +00:00
vfs_init.c We don't need to check the return value of malloc() against 2002-06-22 21:44:11 +00:00
vfs_lookup.c - Replace v_flag with v_iflag and v_vflag 2002-08-04 10:29:36 +00:00
vfs_mount.c Keep a copy of the credential used to mount filesystems around so 2002-08-19 06:52:21 +00:00
vfs_subr.c Replace various spelling with FALLTHROUGH which is lint()able 2002-08-25 13:23:09 +00:00
vfs_syscalls.c Split out a number of mostly VFS and signal related syscalls into 2002-09-01 20:37:28 +00:00
vfs_vnops.c Replace various spelling with FALLTHROUGH which is lint()able 2002-08-25 13:23:09 +00:00
vnode_if.src - Add two new debugging macros: ASSERT_VI_LOCKED and ASSERT_VI_UNLOCKED 2002-08-21 06:19:29 +00:00