-- highly experimental even. So far the closest to a bug in TMPFS that people
have gotten to relates to how ZFS can take away from the memory that TMPFS
needs. One can argue that such is not a bug in TMPFS. Irrespective, even if
there is a bug here and there in TMPFS, it's not in our own advantage to
scare people away from using TMPFS. I for one have been using it, even with
ZFS, very successfully.
The SYSCTL_NODE macro defines a list that stores all child-elements of
that node. If there's no SYSCTL_DECL macro anywhere else, there's no
reason why it shouldn't be static.
file descriptor drops to zero out of _fdrop() and into devfs_close_f()
as it is only relevant for devfs file descriptors.
Reviewed by: kib
MFC after: 1 week
failure (the getnewvnode cannot return an error). In this case, the
null_insmntque_dtr() already unlocked the reclaimed vnode, so VOP_UNLOCK()
in the nullfs_mount() after null_nodeget() failure is wrong.
Tested by: pho
MFC after: 1 week
patch modifies makesyscalls.sh to prefix all of the non-compatibility
calls (e.g. not linux_, freebsd32_) with sys_ and updates the kernel
entry points and all places in the code that use them. It also
fixes an additional name space collision between the kernel function
psignal and the libc function of the same name by renaming the kernel
psignal kern_psignal(). By introducing this change now we will ease future
MFCs that change syscalls.
Reviewed by: rwatson
Approved by: re (bz)
flags field. Updates to the atomic flags are performed using the atomic
ops on the containing word, do not require any vm lock to be held, and
are non-blocking. The vm_page_aflag_set(9) and vm_page_aflag_clear(9)
functions are provided to modify afalgs.
Document the changes to flags field to only require the page lock.
Introduce vm_page_reference(9) function to provide a stable KPI and
KBI for filesystems like tmpfs and zfs which need to mark a page as
referenced.
Reviewed by: alc, attilio
Tested by: marius, flo (sparc64); andreast (powerpc, powerpc64)
Approved by: re (bz)
which requires that ni_strictrelative be set to 0, post-r224810.
Tested by: swills (earlier version), geo dot liaskos at gmail.com
Approved by: re (kib)
an attempt to do an Open operation on any type of file other
than VREG is done. A recent discussion on the IETF working group's
mailing list (nfsv4@ietf.org) decided that NFSERR_SYMLINK
should be returned for all non-regular files and not just symlinks,
so that the Linux client would work correctly.
This change does not affect the FreeBSD NFSv4 client and is not
believed to have a negative effect on other NFSv4 clients.
Reviewed by: zkirsch
Approved by: re (kib)
MFC after: 2 weeks
to resolve the path of the text vnode of the process. The behaviour is
very confusing for any consumer of the procfs, in particular, java.
Reported and tested by: bf
MFC after: 2 weeks
Approved by: re (bz)
to implement fchown(2) and fchmod(2) support for several file types
that previously lacked it. Add MAC entries for chown/chmod done on
posix shared memory and (old) in-kernel posix semaphores.
Based on the submission by: glebius
Reviewed by: rwatson
Approved by: re (bz)
r224086 added "goto out"-style error handling to nfssvc_nfsd(), in order
to reliably call NFSEXITCODE() before returning. Our Capsicum changes,
based on the old "return (error)" model, did not merge nicely.
Approved by: re (kib), mentor (rwatson)
Sponsored by: Google Inc
kernel for FreeBSD 9.0:
Add a new capability mask argument to fget(9) and friends, allowing system
call code to declare what capabilities are required when an integer file
descriptor is converted into an in-kernel struct file *. With options
CAPABILITIES compiled into the kernel, this enforces capability
protection; without, this change is effectively a no-op.
Some cases require special handling, such as mmap(2), which must preserve
information about the maximum rights at the time of mapping in the memory
map so that they can later be enforced in mprotect(2) -- this is done by
narrowing the rights in the existing max_protection field used for similar
purposes with file permissions.
In namei(9), we assert that the code is not reached from within capability
mode, as we're not yet ready to enforce namespace capabilities there.
This will follow in a later commit.
Update two capability names: CAP_EVENT and CAP_KEVENT become
CAP_POST_KEVENT and CAP_POLL_KEVENT to more accurately indicate what they
represent.
Approved by: re (bz)
Submitted by: jonathan
Sponsored by: Google Inc
This was reported to the mailing list freebsd-net@freebsd.org
on July 21, 2011 under the subject "LOR with nfsclient sillyrename".
The LOR occurred when nfs_inactive() called vrele(sp->s_dvp)
while holding the vnode lock on the file in s_dvp. This patch
modifies the client so that it performs the vrele(sp->s_dvp)
as a separate task to avoid the LOR. This fix was discussed
with jhb@ and kib@, who both proposed variations of it.
Tested by: pho, jlott at averesystems.com
Submitted by: jhb (earlier version)
Reviewed by: kib
Approved by: re (kib)
MFC after: 2 weeks
recursive vnode lock on the directory for the case where the
new file name is in the same directory as the old one. The patch
handles this as a special case, recognized by the new directory
having the same file handle as the old one and just VREF()s the old
dir vnode for this case, instead of doing a second VFS_FHTOVP() to get it.
This is required so that the server will work for file systems like
msdosfs, that do not support recursive vnode locking.
This problem was discovered during recent testing by pho@
when exporting an msdosfs file system via the new NFS server.
Tested by: pho
Reviewed by: zkirsch
Approved by: re (kib)
MFC after: 2 weeks
failed after the file was created in nfs_create(). This would
probably only happen during a forced dismount. The old NFS client
does have a vput() for this case. Detected by pho during recent
testing, where an open syscall returned with a vnode still locked.
Tested by: pho
Approved by: re (kib)
MFC after: 2 weeks
32 bits to 64 bits and eliminates the unused mnt_xflag field. The
existing mnt_flag field is completely out of bits, so this update
gives us room to expand. Note that the f_flags field in the statfs
structure is already 64 bits, so the expanded mnt_flag field can
be exported without having to make any changes in the statfs structure.
Approved by: re (bz)
for the remove and rename operations. Some NFSv4 servers will
report NFSERR_GRACE for these operations. This patch changes
the behaviour of the client so that it handles NFSERR_GRACE
like NFSERR_DELAY for non-state related operations like
remove and rename. It also exempts the delegreturn operation
from handling within newnfs_request() for NFSERR_DELAY/NFSERR_GRACE
so that it can handle NFSERR_GRACE in the same manner as before.
This problem was resolved thanks to discussion with bfields at fieldses.org.
The problem was identified at the recent NFSv4 ineroperability
bakeathon.
MFC after: 2 weeks
Isilon has the concept of an in-memory exit-code ring that saves the last exit
code of a function and allows for stack tracing. This is very helpful when
debugging tough issues.
This patch is essentially a no-op for BSD at this point, until we upstream
the dexitcode logic itself. The patch adds DEXITCODE calls to every NFS
function that returns an errno error code. A number of code paths were also
reorganized to have single exit paths, to reduce code duplication.
Submitted by: David Kwan <dkwan@isilon.com>
Reviewed by: rmacklem
Approved by: zml (mentor)
MFC after: 2 weeks
r179247 introduced a possibility of devfs_allocv() returning spurious
ENOENT. If the vnode is selected by vnlru daemon for reclamation, then
devfs_allocv() can get ENOENT from vget() due to devfs_close() dropping
vnode lock around the call to cdevsw d_close method.
Use LK_RETRY in the vget() call, and do some part of the devfs_reclaim()
work in devfs_allocv(), clearing vp->v_data and de->de_vnode. Retry the
allocation of the vnode, now with de->de_vnode == NULL.
The check vp->v_data == NULL at the start of devfs_close() cannot be
affected by the change, since vnode lock must be held while VI_DOOMED
is set, and only dropped after the check.
Reported and tested by: Kohji Okuno <okuno.kohji jp panasonic com>
Reviewed by: attilio
MFC after: 3 weeks
loop in nfscl_getcl() when a forced dismount is in progress,
because nfsv4_lock() will return 0 without sleeping when
MNTK_UNMOUNTF is set.
This patch fixes it so it won't loop calling nfsv4_lock()
for this case.
MFC after: 2 weeks
This comment refers to CAP_NT_SMBS, which does not exist; it should refer to SMB_CAP_NT_SMBS.
Fixing this comment makes it easier for people interested in Capsicum to grep around for
capability rights, whose identifiers are of the form 'CAP_[A-Z_]'.
Approved by: mentor (rwatson), re (Capsicum blanket)
Sponsored by: Google Inc
multiple instances of the same lock_owner when a process both
inherited an open file descriptor plus opened the same file itself.
Since some NFSv4 servers cannot handle multiple instances of
the same lock_owner string, this patch changes the algorithm
used by nfscl_getopen() in the new NFSv4 client to keep that
from happening. The new algorithm is simpler, since there is
no longer any need to ascend the process's parentage tree because
all NFSv4 Closes for a file are done at VOP_INACTIVE()/VOP_RECLAIM(),
making the Opens indistinct w.r.t. use with Lock Ops.
This problem was discovered at the recent NFSv4 interoperability
Bakeathon.
MFC after: 2 weeks
to the lock_owner4 string that goes on the wire. Also, add
code to do a ReleaseLockOwner Op on the lock_owner4 string
before a Close. Apparently not all NFSv4 servers handle multiple
instances of the same lock_owner4 string, at least not in a
compatible way. This patch avoids having multiple instances,
except for one unusual case, which will be fixed by a future commit.
Found at the recent NFSv4 interoperability Bakeathon.
Tested by: tdh at excfb.com
MFC after: 2 weeks
option to vm_object_page_remove() asserts that the specified range of pages
is not mapped, or more precisely that none of these pages have any managed
mappings. Thus, vm_object_page_remove() need not call pmap_remove_all() on
the pages.
This change not only saves time by eliminating pointless calls to
pmap_remove_all(), but it also eliminates an inconsistency in the use of
pmap_remove_all() versus related functions, like pmap_remove_write(). It
eliminates harmless but pointless calls to pmap_remove_all() that were being
performed on PG_UNMANAGED pages.
Update all of the existing assertions on pmap_remove_all() to reflect this
change.
Reviewed by: kib
mode attribute in as 0 when doing writes. The change adds
the Mode attribute plus the others except Owner and Owner_group
to the list requested by the NFSv4 Write Operation. This fixed
a problem where an executable file built by "cc" would get mode
0111 instead of 0755 for some NFSv4 servers.
Found at the recent NFSv4 interoperability Bakeathon.
Tested by: tdh at excfb.com
MFC after: 2 weeks
server replied NFS3ERR_JUKEBOX/NFS4ERR_DELAY to an rpc.
This affected both NFSv3 and NFSv4. Found during testing
at the recent NFSv4 interoperability Bakeathon.
MFC after: 2 weeks
was used for doing a mount when performing system operations
on AUTH_SYS mounts. This resolved an issue when mounting
a Linux server. Found during testing at the recent
NFSv4 interoperability Bakeathon.
MFC after: 2 weeks
operations while traversing non-exported file systems. This is
required for some non-FreeBSD clients to do NFSv4 mounts. Found during
the recent NFSv4 interoperability Bakeathon.
MFC after: 2 weeks
lock the mutex when manipulating rc_flag in the DRC cache.
This is believed to fix a hung server that was reported
to the freebsd-fs@ list on June 9 under the subject heading
"New NFS server stress test hang", where all the threads
were waiting for the RC_LOCKED flag to clear.
Tested by: jwd at slowblink.com
MFC after: 2 weeks
the NFS subsystems use five of the rpcsec_gss/kgssapi entry points,
but since it was not obvious which others might be useful, all
nineteen were included. Basically the nineteen entry points are
set in a structure called rpc_gss_entries and inline functions
defined in sys/rpc/rpcsec_gss.h check for the entry points being
non-NULL and then call them. A default value is returned otherwise.
Requested by rwatson.
Reviewed by: jhb
MFC after: 2 weeks
cloned from the old NFS client, plus additions for NFSv4. A
review of this code is in progress, however it was felt by the
reviewer that it could go in now, before code slush. Any changes
required by the review can be committed as bug fixes later.
should be ok, since the client now delays NFSv4 Close operations
until VOP_INACTIVE()/VOP_RECLAIM(). As such, there should be no
risk that the NFSv4 Open is closed while an associated byte range lock
still exists.
Tested by: avg
MFC after: 2 weeks
"p_leader" for the "id" for POSIX byte range locking. I think
this would only have affected processes created by rfork(2)
with the RFTHREAD flag specified. This patch fixes that by
passing the "id" down through the various functions from
nfs_advlock().
MFC after: 2 weeks
doesn't return an error when the underlying file system
lacks support for any of the four _PC_xxx values used, by
falling back to default values.
Tested by: avg
MFC after: 2 weeks
VM_PAGER_AGAIN to VM_PAGER_ERROR for the uwritten pages. Return
VM_PAGER_AGAIN for the partially written page. Always forward at least
one page in the loop of vm_object_page_clean().
VM_PAGER_ERROR causes the page reactivation and does not clear the
page dirty state, so the write is not lost.
The change fixes an infinite loop in vm_object_page_clean() when the
filesystem returns permanent errors for some page writes.
Reported and tested by: gavin
Reviewed by: alc, rmacklem
MFC after: 1 week
Pathconf RPC for cases where the reply doesn't include
the answer. This fixes a problem reported by avg@ where
the NFSv3 Pathconf RPC would fail when "ls -l" did an
lpathconf(2) for _PC_ACL_NFS4.
Tested by: avg
MFC after: 2 weeks
correctly during a forced dismount. This required that
the exclusive and shared (refcnt) sleep lock functions check
for MNTK_UMOUNTF before sleeping, so that they won't block
while nfscl_umount() is getting rid of the state. As
such, a "struct mount *" argument was added to the locking
functions. I believe the only remaining case where a forced
dismount can get hung in the kernel is when a thread is
already attempting to do a TCP connect to a dead server
when the krpc client structure called nr_client is NULL.
This will only happen just after a "mount -u" with options
that force a new TCP connection is done, so it shouldn't
be a problem in practice.
MFC after: 2 weeks
in the new NFS client so that a forced dismount doesn't
get stuck in the VFS_SYNC() call that happens before
VFS_UNMOUNT() in dounmount().
Additional changes are needed before forced dismounts will work.
MFC after: 2 weeks
argument for a write RPC when it succeeds for the first one and
fails for a subsequent RPC within the same call to the function.
This makes it compatible with the old NFS client for this case.
MFC after: 2 weeks
method, so that callers can indicate the minimum vnode
locking requirement. This will allow some file systems to choose
to return a LK_SHARED locked vnode when LK_SHARED is specified
for the flags argument. This patch only adds the flag. It
does not change any file system to use it and all callers
specify LK_EXCLUSIVE, so file system semantics are not changed.
Reviewed by: kib
to both NFS clients. This avoids the crash reported by
Sergey Kandaurov (pluknet@gmail.com) to the freebsd-fs@
list with subject "[old nfsclient] different nmount()
args passed from mount vs mount_nfs" dated May 17, 2011.
Tested by: pluknet at gmail.com (old nfs client)
MFC after: 2 weeks
new NFS client. It will then be reduced to whatever the
server says it can support. There might be an argument
that this could be one block larger, but since NFS is
a byte granular system, I chose not to do that.
Suggested by: Matt Dillon
Tested by: Daniel Braniss (earlier version)
MFC after: 2 weeks
or f_ffree fields of "struct statfs" are negative, since the
values that go on the wire are unsigned and will appear to be
very large positive values otherwise. This makes the handling
of a negative f_bavail compatible with the old/regular NFS server.
MFC after: 2 weeks
that are now in "struct statfs" for NFSv3 and NFSv4. Since
the ffiles value is uint64_t on the wire, I clip the value
to INT64_MAX to avoid setting f_ffree negative.
Tested by: kib
MFC after: 2 weeks
values of error numbers in sys/errno.h will be the same
as the ones specified by the NFS RFCs and that the code
needs to be fixed if error numbers are changed in sys/errno.h.
Suggested by: Peter Jeremy
MFC after: 2 weeks
checking at open time. It may improve performance for read-only
NFS mounts. Use deliberately.
MFC after: 1 week
Reviewed by: rmacklem, jhb (earlier version)
in mnt_optnew. This is needed so that the old mount(2) syscall
works and that is needed so that amd(8) works. The code was
basically just cribbed from sys/nfsclient/nfs_vfsops.c with minor
changes. This patch is mainly to fix the new NFS client so that
amd(8) works with it. Thanks go to Craig Rodrigues for helping with
this.
Tested by: Craig Rodrigues (for amd)
MFC after: 2 weeks
- 77115: Implement support for O_DIRECT.
- 98425: Fix a performance issue introduced in 70131 that was causing
reads before writes even when writing full blocks.
- 98658: Rename the BALLOC flags from B_* to BA_* to avoid confusion with
the struct buf B_ flags.
- 100344: Merge the BA_ and IO_ flags so so that they may both be used in
the same flags word. This merger is possible by assigning the IO_ flags
to the low sixteen bits and the BA_ flags the high sixteen bits.
- 105422: Fix a file-rewrite performance case.
- 129545: Implement IO_INVAL in VOP_WRITE() by marking the buffer as
"no cache".
- Readd the DOINGASYNC() macro and use it to control asynchronous writes.
Change i-node updates to honor DOINGASYNC() instead of always being
synchronous.
- Use a PRIV_VFS_RETAINSUGID check instead of checking cr_uid against 0
directly when deciding whether or not to clear suid and sgid bits.
Submitted by: Pedro F. Giffuni giffunip at yahoo
NFS client (which I guess is no longer experimental). The fstype "newnfs"
is now "nfs" and the regular/old NFS client is now fstype "oldnfs".
Although mounts via fstype "nfs" will usually work without userland
changes, an updated mount_nfs(8) binary is needed for kernels built with
"options NFSCL" but not "options NFSCLIENT". Updated mount_nfs(8) and
mount(8) binaries are needed to do mounts for fstype "oldnfs".
The GENERIC kernel configs have been changed to use options
NFSCL and NFSD (the new client and server) instead of NFSCLIENT and NFSSERVER.
For kernels being used on diskless NFS root systems, "options NFSCL"
must be in the kernel config.
Discussed on freebsd-fs@.
when building kernels that don't have "options NFS_ROOT"
specified. I plan on moving the functions that use these
data structures into the shared code in sys/nfs/nfs_diskless.c
in a future commit. At that time, these definitions will no
longer be needed in nfs_vfsops.c and nfs_clvfsops.c.
MFC after: 2 weeks
same diskless NFS root code as the regular client, which
was moved to sys/nfs by r221032. This fixes the newnfs
client so that it can do an NFSv3 diskless root file system.
MFC after: 2 weeks
set the f_flags field of "struct statfs". This had the interesting
effect of making the NFSv4 mounts "disappear" after r221014,
since NFSMNT_NFSV4 and MNT_IGNORE became the same bit.
MFC after: 2 weeks
"struct nfs_args" as the regular NFS client. This is needed
so that the old mount(2) syscall will work and it makes
sharing of the diskless NFS root code easier. Eary in the
porting exercise I introduced a new revision of nfs_args, but
didn't actually need it, thanks to nmount(2). I re-introduced the
NFSMNT_KERB flag, since it does essentially the same thing and
the old one would not have been used because it never worked.
I also added a few new NFSMNT_xxx flags to sys/nfsclient/nfs_args.h
that are used by the experimental NFS client.
MFC after: 2 weeks
nm_maxfilesize. This value rarely, if ever, changes
and the nm_mtx mutex is locked/unlocked earlier in
the function, which should be sufficient to avoid
getting a stale cached value for it. There is a
discussion w.r.t. what these tests should be, but
I've left them basically the same as the regular
NFS client for now.
Suggested by: pjd
MFC after: 2 weeks
so that it won't try and use vp->v_mount to do an RPC during
a forced dismount. There needs to be at least one more kernel
commit, plus a change to the umount(8) command before forced
dismounts will work for the experimental NFS client.
MFC after: 2 weeks
experimental NFS client to take care of overflows for the calls
above the buffer cache layer in a manner similar to r220876.
Thanks go to dillon at apollo.backplane.com for providing the
snippet of code that does this.
MFC after: 2 weeks
experimental NFS client to take care of overflows. Thanks
go to dillon at apollo.backplane.com for providing the
snippet of code that does this.
MFC after: 2 weeks
within the experimental NFS client. Mostly add mutex locking
and use the same rsize, wsize during the operation by keeping
a local copy of it. This is another change that brings it
closer to the regular NFS client.
MFC after: 2 weeks
adding the check to nfsrpc_close() isn't useful. Also,
the check in nfscl_getcl() must be more involved, since
it needs to check before and after the acquisition of
the refcnt on nfsc_lock, while the mutex that protects
the client state data is held.
for a case that will probably never happen. It can only
happen if a server were to successfully lookup a file, but not
return attributes for that file. Although technically allowed
by the NFSv3 RFC, I doubt any server would ever do this.
However, if it did, the client would have not vput()'d the
new vnode when it needed to do so.
MFC after: 2 weeks
that would be needed if, in the future, nfscl_loadattrcache()
were to return an error. Currently nfscl_loadattrcache()
never returns an error, so these cases never currently happen.
MFC after: 2 weeks
experimental NFS client's vnode op functions to make
them compatible with the regular NFS client. I'll admit
I'm not sure that the mutex locks around the assignments
are needed, but the regular client has them, so I added them.
Also, add handling of the case of partial attributes in
setattr to be compatible with the regular client.
MFC after: 2 weeks
functions, so that threads don't get stuck in them during
a forced dismount. nfs_sync/VFS_SYNC() needs this, since it is
called by dounmount() before VFS_UNMOUNT(). The nfscl_nget()
case makes sure that a thread doing an VOP_OPEN() or
VOP_ADVLOCK() call doesn't get blocked before attempting
the RPC. Attempting RPCs don't block, since they all
fail once a forced dismount is in progress.
The third one at the beginning of nfsrpc_close()
is done so threads don't get blocked while doing VOP_INACTIVE()
as the vnodes are cleared out.
With these three changes plus a change to the umount(1)
command so that it doesn't do "sync()" for the forced case
seem to make forced dismounts work for the experimental NFS
client.
MFC after: 2 weeks
message that was generated when doing experimental NFS client
mounts. I put that message in because the krpc would hang with
the default size for mounts that used large rsize/wsize values.
Since the bug that caused these hangs was fixed by r213756,
I think the message is no longer needed.
MFC after: 2 weeks
same as the regular NFS client for NFSv3. The main one is making
use of a reserved port# the default. Also, set the retry limit
for TCP the same and fix the code so that it doesn't disable
readdirplus for NFSv4.
MFC after: 2 weeks
threads in the same manner as the regular NFS client after
r214026 was committed. This resolves the lors fixed by r214026
and its predecessors for the regular client.
Reviewed by: jhb
MFC after: 2 weeks
to determine if a file system supports NFSv4 ACLs. Since
VOP_PATHCONF() must be called with a locked vnode, the function
is called before nfsvno_fillattr() and the result is passed in
as an extra argument.
MFC after: 2 weeks
crossing of server mount points properly. The functions
nfsvno_fillattr() and nfsv4_fillattr() were modified to
take the extra arguments that are the mount point, a flag
to indicate that it is a file system root and the mounted
on fileno. The mount point argument needs to be busy when
nfsvno_fillattr() is called, since the vp argument is not
locked.
Reviewed by: kib
MFC after: 2 weeks
mount point crossings correctly. It was testing the wrong flag.
Also, try harder to make sure that the fsid is different than
the one assigned to the client mount point, by hashing the
server's fsid (just to create a different value deterministically)
when it is the same.
MFC after: 2 weeks
of NFSv2 getting an error return from VOP_MKNOD(). Without this
patch, the server file system remains busy after an NFSv2
VOP_MKNOD() fails.
MFC after: 2 weeks
the experimental NFS server, so that it doesn't leak memory
when unloaded. However, unloading the NFSv4 server is not
recommended, since all NFSv4 state will be lost by the unload
and clients will have to recover the state after a server
reload/restart as if the server crashed/rebooted.
MFC after: 2 weeks
VOP_LOOKUP() returned. This fixes a bug in the experimental
NFS server for the case where VFS_VGET() fails returning EOPNOTSUPP
in the ReaddirPlus RPC, forcing the use of VOP_LOOKUP() instead.
MFC after: 2 weeks
workaround for fdescfs to not panic when ncookies is not NULL, similar
to the one committed as r152254, but simpler, due to fdescfs_readdir()
not calling vfs_read_dirent().
PR: kern/156177
MFC after: 1 week
bit fileid's in NFSv2 and NFSv3. Without this fix, invalid casting (and sign
extension) was creating problems for any fileid greater than 2^31.
We discovered this because we have test clusters with more than 2 billion
allocated files and 64-bit ino_t's (and friend structures).
Reviewed by: rmacklem
Approved by: zml (mentor)
MFC after: 2 weeks
root directory of msdosfs mount. The VFS code would handle deletion
case itself too, assuming VV_ROOT flag is not lost. The msdosfs_rename()
should also note attempt to rename root via doscheckpath() or different
mount point check leading to EXDEV. Nonetheless, keep the checks for now.
The change is inspired by NetBSD change referenced in PR, but return
EBUSY like kern_unlinkat() does.
PR: kern/152079
MFC after: 1 week
- Hold the proc lock while changing the state from PRS_NEW to PRS_NORMAL
in fork to honor the locking requirements. While here, expand the scope
of the PROC_LOCK() on the new process (p2) to avoid some LORs. Previously
the code was locking the new child process (p2) after it had locked the
parent process (p1). However, when locking two processes, the safe order
is to lock the child first, then the parent.
- Fix various places that were checking p_state against PRS_NEW without
having the process locked to use PROC_LOCK(). Every place was already
locking the process, just after the PRS_NEW check.
- Remove or reduce the use of PROC_SLOCK() for places that were checking
p_state against PRS_NEW. The PROC_LOCK() alone is sufficient for reading
the current state.
- Reorder fill_kinfo_proc() slightly so it only acquires PROC_SLOCK() once.
MFC after: 1 week
PMC/SYSV/...).
No FreeBSD version bump, the userland application to query the features will
be committed last and can serve as an indication of the availablility if
needed.
Sponsored by: Google Summer of Code 2010
Submitted by: kibab
Reviewed by: arch@ (parts by rwatson, trasz, jhb)
X-MFC after: to be determined in last commit with code from this project
file's last accessed, modified, and changed times:
TMPFS_NODE_ACCESSED and TMPFS_NODE_CHANGED should be set unconditionally
in tmpfs_remove() without regard to the number of hard links to the file.
Otherwise, after the last directory entry for a file has been removed, a
process that still has the file open could read stale values for the last
accessed and changed times with fstat(2).
Similarly, tmpfs_close() should update the time-related fields even if all
directory entries for a file have been removed. In this case, the effect
is that the time-related fields will have values that are later than
expected. They will correspond to the time at which fstat(2) is called.
In collaboration with: kib
MFC after: 1 week
VNET socket push back:
try to minimize the number of places where we have to switch vnets
and narrow down the time we stay switched. Add assertions to the
socket code to catch possibly unset vnets as seen in r204147.
While this reduces the number of vnet recursion in some places like
NFS, POSIX local sockets and some netgraph, .. recursions are
impossible to fix.
The current expectations are documented at the beginning of
uipc_socket.c along with the other information there.
Sponsored by: The FreeBSD Foundation
Sponsored by: CK Software GmbH
Reviewed by: jhb
Tested by: zec
Tested by: Mikolaj Golub (to.my.trociny gmail.com)
MFC after: 2 weeks
object's size field. Previously, that field was always zero, even
when the object tn_reg.tn_aobj contained numerous pages.
Apply style fixes to tmpfs_reg_resize().
In collaboration with: kib
free i-nodes or blocks to handle a race where another thread might have
allocated the last i-node or block while we were waiting for the buffer.
Tested by: dougb
incorrectly calling vm_object_page_clean(). They are passing the length of
the range rather than the ending offset of the range.
Perform the OFF_TO_IDX() conversion in vm_object_page_clean() rather than the
callers.
Reviewed by: kib
MFC after: 3 weeks
so that future allocations start with most recently allocated block
rather than the beginning of the filesystem.
- Fix ext2_alloccg() to properly scan for 8 block chunks that are not
aligned on 8-bit boundaries. Previously this was causing new blocks
to be allocated in a highly fragmented fashion (block 0 of a file at
lbn N, block 1 at lbn N + 8, block 2 at lbn N + 16, etc.).
- Cosmetic tweaks to the currently-disabled fancy realloc sysctls.
PR: kern/153584
Discussed with: bde
Tested by: Pedro F. Giffuni giffunip at yahoo, Zheng Liu (lz)
either overflow the supplied buffer, or cause uiomove fail.
Do not advance cached de when directory entry was not copied out.
Do not return EOF when no entries could be copied due to first entry
too large for supplied buffer, signal EINVAL instead.
Reported by: Beat G?tzi <beat chruetertee ch>
MFC after: 1 week
Eliminate the i_devvp field from the incore inodes, we can get the same
value from ip->i_ump->um_devvp.
Submitted by: Pedro F. Giffuni giffunip at yahoo
MFC after: 1 week
