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requested by and ok pedro
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ok tedu, pedro
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ok pedro
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used and will never be used this way in VFS
requested by and ok pedro, ok krw, biorn
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has coming...
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anymore. Testing by jolan@, thanks.
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lock. Fixes a race as seen on PR kern/4915. Okay miod@ and joris@,
tested by krw@ and hshoexer@, thanks.
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of panics and bugfixes. Access curproc directly, do not expect a process
pointer as an argument. Should fix many "process context required" bugs.
Incentive and okay millert@, okay marc@. Various testing, thanks.
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been worked on, so EA is pointless. Also the code is not enabled
in GENERIC so it is not being tested or maintained.
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ok pedro@
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filesystem as doomed and unmount it
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no change in compiler assembly output.
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it could never always work, and worse, may cause other bugs/crashes.
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ok millert@, miod@, marius@
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use mode_t in syscalls.master and to use mode_t in more places in
the kernel. It also makes lint much more useful on kernel code.
I've also added a placeholder for st_birthtime to make a UFS2 import
easier at some future date.
Requested by and OK deraadt@
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things such that code that only need a second-resolution uptime or wall
time, and used to get that from time.tv_secs or mono_time.tv_secs now get
this from separate time_t globals time_second and time_uptime.
ok art@ niklas@ nordin@
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vnode's mount point. this makes it impossible for a user to bypass the
noexec protection of a mount point by null-mounting it on top of itself.
ok tedu@ millert@
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testing for quite some time by brad + otto
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from Patrick Latifi <patrick.l@hermes.usherb.ca>
ok jason@ tedu@
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argument. old cred only calls user suser_ucred. this will allow future
work to more flexibly implement the idea of a root process. looks like
something i saw in freebsd, but a little different.
use of suser_ucred vs suser in file system code should be looked at again,
for the moment semantics remain unchanged.
review and input from art@ testing and further review miod@
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rescinded 22 July 1999. Proofed by myself and Theo.
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won't always work, but it's the best we can do for now. this covers
at least some of the failure cases the previous commit to vfs_lookup.c
checks for.
ok weingart@
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ok and input csapuntz@
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vfs_subr.c:
add a missing simple_lock_init for vnode interlock
try to avoid reclaiming locked or layered vnodes
initialize vnlock pointer to NULL
remove old code to free vnlock, never used
lockinit the new vnode lock
vfs_syscalls.c:
support for VLAYER flag
vnode_if.sh:
support for splitting VDESC flags
vnode_if.src:
split VDESC flags
WILLPUT is the combination of WILLRELE and WILLUNLOCK
most uses for WILLRELE become WILLPUT
vnode.h:
add v_lock to struct vnode
add VLAYER flag
update for new VDESC flags
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ok deraadt@ and art@
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on the returned file, do the FREF inside getvnode so that people can't
get away with avoiding FREF and FRELE.
Eyeballed by various people.
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to get shared locks for lookup and get the exclusive lock only with
LK_DRAIN on unmount and do the real exclusive locking with flags in
mnt_flags, we now use shared locks for lookup and an exclusive lock for
unmount.
This is accomplished by slightly changing the semantics of vfs_busy.
Old vfs_busy behavior:
- with LK_NOWAIT set in flags, a shared lock was obtained if the
mountpoint wasn't being unmounted, otherwise we just returned an error.
- with no flags, a shared lock was obtained if the mountpoint was being
unmounted, otherwise we slept until the unmount was done and returned
an error.
LK_NOWAIT was used for sync(2) and some statistics code where it isn't really
critical that we get the correct results.
0 was used in fchdir and lookup where it's critical that we get the right
directory vnode for the filesystem root.
After this change vfs_busy keeps the same behavior for no flags and LK_NOWAIT.
But if some other flags are passed into it, they are passed directly
into lockmgr (actually LK_SLEEPFAIL is always added to those flags because
if we sleep for the lock, that means someone was holding the exclusive lock
and the exclusive lock is only held when the filesystem is being unmounted.
More changes:
dounmount must now be called with the exclusive lock held. (before this
the caller was supposed to hold the vfs_busy lock, but that wasn't always
true).
Zap some (now) unused mount flags.
And the highlight of this change:
Add some vfs_busy calls to match some vfs_unbusy calls, especially in
sys_mount. (lockmgr doesn't detect the case where we release a lock noone
holds (it will do that soon)).
If you've seen hangs on reboot with mfs this should solve it (I repeat this
for the fourth time now, but this time I spent two months fixing and
redesigning this and reading the code so this time I must have gotten
this right).
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the same semantics as NetBSD anyway, so it's good to avoid name collissions.
- Always fdremove before freeing the file, not the other way around.
- falloc FREFs the file.
- have FILE_SET_MATURE FRELE the file (It feels like a good ortogonality to
falloc FREFing the file).
- Use closef as much as possible instead of ffree in error paths of
falloc:ing functions. closef is much more careful with the fd and can
deal with the fd being forcibly closed by dup2. Also try to avoid
manually calling *fo_close when closef can do that for us (this makes
some error paths mroe complicated (sys_socketpair and sys_pipe), but
others become simpler (sys_open)).
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from fd tables and other long-lived objects). This is to avoid races between
using a file descriptor and having another process (with shared fd table)
close it. We use a separate refence count so that error values from close(2)
will be correctly returned to the caller of close(2).
The macros for those reference counts are FILE_USE(fp) and FILE_UNUSE(fp).
Make sure that the cases where closef can be called "incorrectly" (most notably
dup2(2)) are handled.
Right now only callers of closef (and {,p}read) use FILE_{,UN}USE correctly,
more fixes incoming soon.
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