cvs commit: src/sys/alpha/linux linux_machdep.c src/sys/alpha/osf1 osf1_misc.c src/sys/compat/ia32 ia32_sysvec.c src/sys/compat/linux linux_misc.c src/sys/compat/svr4 imgact_svr4.c svr4_filio.c svr4_misc.c svr4_resource.c src/sys/fs/fdescfs fdesc_vfsops.c ...

[John Baldwin]

jhb         2004/02/04 13:52:58 PST

  FreeBSD src repository

  Modified files:
    sys/alpha/linux      linux_machdep.c 
    sys/alpha/osf1       osf1_misc.c 
    sys/compat/ia32      ia32_sysvec.c 
    sys/compat/linux     linux_misc.c 
    sys/compat/svr4      imgact_svr4.c svr4_filio.c svr4_misc.c 
                         svr4_resource.c 
    sys/fs/fdescfs       fdesc_vfsops.c 
    sys/fs/msdosfs       msdosfs_vnops.c 
    sys/fs/nwfs          nwfs_io.c 
    sys/fs/procfs        procfs_rlimit.c 
    sys/fs/smbfs         smbfs_io.c 
    sys/gnu/ext2fs       ext2_readwrite.c 
    sys/i386/ibcs2       ibcs2_misc.c 
    sys/i386/linux       imgact_linux.c linux_machdep.c 
    sys/kern             imgact_aout.c imgact_elf.c imgact_gzip.c 
                         init_main.c kern_acct.c kern_descrip.c 
                         kern_exit.c kern_fork.c kern_resource.c 
                         kern_sig.c subr_trap.c sys_generic.c 
                         uipc_socket2.c 
    sys/nfsclient        nfs_bio.c 
    sys/sys              proc.h resource.h resourcevar.h 
    sys/ufs/ffs          ffs_vnops.c 
    sys/vm               vm_glue.c vm_map.c vm_mmap.c vm_pageout.c 
                         vm_unix.c 
  Log:
  Locking for the per-process resource limits structure.
  - struct plimit includes a mutex to protect a reference count.  The plimit
    structure is treated similarly to struct ucred in that is is always copy
    on write, so having a reference to a structure is sufficient to read from
    it without needing a further lock.
  - The proc lock protects the p_limit pointer and must be held while reading
    limits from a process to keep the limit structure from changing out from
    under you while reading from it.
  - Various global limits that are ints are not protected by a lock since
    int writes are atomic on all the archs we support and thus a lock
    wouldn't buy us anything.
  - All accesses to individual resource limits from a process are abstracted
    behind a simple lim_rlimit(), lim_max(), and lim_cur() API that return
    either an rlimit, or the current or max individual limit of the specified
    resource from a process.
  - dosetrlimit() was renamed to kern_setrlimit() to match existing style of
    other similar syscall helper functions.
  - The alpha OSF/1 compat layer no longer calls getrlimit() and setrlimit()
    (it didn't used the stackgap when it should have) but uses lim_rlimit()
    and kern_setrlimit() instead.
  - The svr4 compat no longer uses the stackgap for resource limits calls,
    but uses lim_rlimit() and kern_setrlimit() instead.
  - The ibcs2 compat no longer uses the stackgap for resource limits.  It
    also no longer uses the stackgap for accessing sysctl's for the
    ibcs2_sysconf() syscall but uses kernel_sysctl() instead.  As a result,
    ibcs2_sysconf() no longer needs Giant.
  - The p_rlimit macro no longer exists.
  
  Submitted by:   mtm (mostly, I only did a few cleanups and catchups)
  Tested on:      i386
  Compiled on:    alpha, amd64
  
  Revision  Changes    Path
  1.33      +8 -3      src/sys/alpha/linux/linux_machdep.c
  1.45      +19 -16    src/sys/alpha/osf1/osf1_misc.c
  1.16      +22 -39    src/sys/compat/ia32/ia32_sysvec.c
  1.152     +19 -14    src/sys/compat/linux/linux_misc.c
  1.22      +5 -3      src/sys/compat/svr4/imgact_svr4.c
  1.31      +7 -4      src/sys/compat/svr4/svr4_filio.c
  1.70      +31 -32    src/sys/compat/svr4/svr4_misc.c
  1.16      +26 -26    src/sys/compat/svr4/svr4_resource.c
  1.42      +3 -1      src/sys/fs/fdescfs/fdesc_vfsops.c
  1.147     +7 -5      src/sys/fs/msdosfs/msdosfs_vnops.c
  1.33      +7 -4      src/sys/fs/nwfs/nwfs_io.c
  1.9       +18 -4     src/sys/fs/procfs/procfs_rlimit.c
  1.26      +9 -5      src/sys/fs/smbfs/smbfs_io.c
  1.27      +7 -7      src/sys/gnu/ext2fs/ext2_readwrite.c
  1.53      +33 -51    src/sys/i386/ibcs2/ibcs2_misc.c
  1.51      +5 -2      src/sys/i386/linux/imgact_linux.c
  1.41      +3 -2      src/sys/i386/linux/linux_machdep.c
  1.93      +5 -3      src/sys/kern/imgact_aout.c
  1.144     +6 -5      src/sys/kern/imgact_elf.c
  1.51      +4 -2      src/sys/kern/imgact_gzip.c
  1.241     +11 -13    src/sys/kern/init_main.c
  1.69      +9 -5      src/sys/kern/kern_acct.c
  1.224     +16 -7     src/sys/kern/kern_descrip.c
  1.220     +6 -5      src/sys/kern/kern_exit.c
  1.213     +4 -5      src/sys/kern/kern_fork.c
  1.129     +159 -64   src/sys/kern/kern_resource.c
  1.270     +3 -5      src/sys/kern/kern_sig.c
  1.263     +4 -4      src/sys/kern/subr_trap.c
  1.128     +4 -1      src/sys/kern/sys_generic.c
  1.119     +8 -2      src/sys/kern/uipc_socket2.c
  1.127     +9 -6      src/sys/nfsclient/nfs_bio.c
  1.367     +1 -2      src/sys/sys/proc.h
  1.21      +1 -1      src/sys/sys/resource.h
  1.37      +20 -2     src/sys/sys/resourcevar.h
  1.126     +7 -5      src/sys/ufs/ffs/ffs_vnops.c
  1.189     +8 -6      src/sys/vm/vm_glue.c
  1.327     +16 -9     src/sys/vm/vm_map.c
  1.178     +24 -11    src/sys/vm/vm_mmap.c
  1.250     +3 -2      src/sys/vm/vm_pageout.c
  1.44      +8 -4      src/sys/vm/vm_unix.c