18 Oct, 2007
4 commits
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A sysctl method was added to enable and disable debugging levels. After
further review, it was decided that there are better approaches to doing this
and the sysctl methodology isn't really desirable. This patch removes the
sysctl code from 9p.Signed-off-by: Eric Van Hensbergen
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This patch moves transport dynamic registration and matching to the net
module to prevent a bad Kconfig dependency between the net and fs 9p modules.Signed-off-by: Eric Van Hensbergen
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The 9P2000 protocol requires the authentication and permission checks to be
done in the file server. For that reason every user that accesses the file
server tree has to authenticate and attach to the server separately.
Multiple users can share the same connection to the server.Currently v9fs does a single attach and executes all I/O operations as a
single user. This makes using v9fs in multiuser environment unsafe as it
depends on the client doing the permission checking.This patch improves the 9P2000 support by allowing every user to attach
separately. The patch defines three modes of access (new mount option
'access'):- attach-per-user (access=user) (default mode for 9P2000.u)
If a user tries to access a file served by v9fs for the first time, v9fs
sends an attach command to the server (Tattach) specifying the user. If
the attach succeeds, the user can access the v9fs tree.
As there is no uname->uid (string->integer) mapping yet, this mode works
only with the 9P2000.u dialect.- allow only one user to access the tree (access=)
Only the user with uid can access the v9fs tree. Other users that attempt
to access it will get EPERM error.- do all operations as a single user (access=any) (default for 9P2000)
V9fs does a single attach and all operations are done as a single user.
If this mode is selected, the v9fs behavior is identical with the current
one.Signed-off-by: Latchesar Ionkov
Signed-off-by: Eric Van Hensbergen -
This patch abstracts out the interfaces to underlying transports so that
new transports can be added as modules. This should also allow kernel
configuration of transports without ifdef-hell.Signed-off-by: Eric Van Hensbergen
17 Oct, 2007
5 commits
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Why do we need r/o bind mounts?
This feature allows a read-only view into a read-write filesystem. In the
process of doing that, it also provides infrastructure for keeping track of
the number of writers to any given mount.This has a number of uses. It allows chroots to have parts of filesystems
writable. It will be useful for containers in the future because users may
have root inside a container, but should not be allowed to write to
somefilesystems. This also replaces patches that vserver has had out of the
tree for several years.It allows security enhancement by making sure that parts of your filesystem
read-only (such as when you don't trust your FTP server), when you don't want
to have entire new filesystems mounted, or when you want atime selectively
updated. I've been using the following script to test that the feature is
working as desired. It takes a directory and makes a regular bind and a r/o
bind mount of it. It then performs some normal filesystem operations on the
three directories, including ones that are expected to fail, like creating a
file on the r/o mount.This patch:
Some filesystems forego the vfs and may_open() and create their own 'struct
file's.This patch creates a couple of helper functions which can be used by these
filesystems, and will provide a unified place which the r/o bind mount code
may patch.Also, rename an existing, static-scope init_file() to a less generic name.
Signed-off-by: Dave Hansen
Cc: Christoph Hellwig
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make request_key() and co fundamentally asynchronous to make it easier for
NFS to make use of them. There are now accessor functions that do
asynchronous constructions, a wait function to wait for construction to
complete, and a completion function for the key type to indicate completion
of construction.Note that the construction queue is now gone. Instead, keys under
construction are linked in to the appropriate keyring in advance, and that
anyone encountering one must wait for it to be complete before they can use
it. This is done automatically for userspace.The following auxiliary changes are also made:
(1) Key type implementation stuff is split from linux/key.h into
linux/key-type.h.(2) AF_RXRPC provides a way to allocate null rxrpc-type keys so that AFS does
not need to call key_instantiate_and_link() directly.(3) Adjust the debugging macros so that they're -Wformat checked even if
they are disabled, and make it so they can be enabled simply by defining
__KDEBUG to be consistent with other code of mine.(3) Documentation.
[alan@lxorguk.ukuu.org.uk: keys: missing word in documentation]
Signed-off-by: David Howells
Signed-off-by: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Adrian Bunk points out that "unsafe" was used to mark modules touched by
the deprecated MOD_INC_USE_COUNT interface, which has long gone. It's time
to remove the member from the module structure, as well.If you want a module which can't unload, don't register an exit function.
(Vlad Yasevich says SCTP is now safe to unload, so just remove the
__unsafe there).Signed-off-by: Rusty Russell
Acked-by: Shannon Nelson
Acked-by: Dan Williams
Acked-by: Vlad Yasevich
Cc: Sridhar Samudrala
Cc: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Slab constructors currently have a flags parameter that is never used. And
the order of the arguments is opposite to other slab functions. The object
pointer is placed before the kmem_cache pointer.Convert
ctor(void *object, struct kmem_cache *s, unsigned long flags)
to
ctor(struct kmem_cache *s, void *object)
throughout the kernel
[akpm@linux-foundation.org: coupla fixes]
Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
sparc64:
net/sunrpc/xprtrdma/verbs.c:1264: warning: long long unsigned int format, u64 arg (arg 3)
net/sunrpc/xprtrdma/verbs.c:1264: warning: long long unsigned int format, u64 arg (arg 4)Cc: Trond Myklebust
Cc: "David S. Miller"
Cc: "J. Bruce Fields"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
16 Oct, 2007
31 commits
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The difference in both functions is in the "id" passed to
the rt6_select, so just pass it as an extra argument from
two outer helpers.This is minus 60 lines of code and 360 bytes of .text
Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
The pnigh_lookup is used to lookup proxy entries and to
create them in case lookup failed.However, the "creation" code does not perform the re-lookup
after GFP_KERNEL allocation. This is done because the code
is expected to be protected with the RTNL lock, so add the
assertion (mainly to address future questions from new network
developers like me :) ).Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
kmalloc + memset -> kzalloc in frag_alloc_queue
Signed-off-by: Denis V. Lunev
Signed-off-by: David S. Miller -
With all the users of the double pointers removed from the IPv6 input path,
this patch converts all occurances of sk_buff ** to sk_buff * in IPv6 input
handlers.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
These ones use the generic data types too, so move
them in one place.Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
After the evictor code is consolidated there is no need in
passing the extra pointer to the xxx_put() functions.The only place when it made sense was the evictor code itself.
Maybe this change must got with the previous (or with the
next) patch, but I try to make them shorter as much as
possible to simplify the review (but they are still large
anyway), so this change goes in a separate patch.Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
The evictors collect some statistics for ipv4 and ipv6,
so make it return the number of evicted queues and account
them all at once in the caller.The XXX_ADD_STATS_BH() macros are just for this case,
but maybe there are places in code, that can make use of
them as well.Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
To make in possible we need to know the exact frag queue
size for inet_frags->mem management and two callbacks:* to destoy the skb (optional, used in conntracks only)
* to free the queue itself (mandatory, but later I plan to
move the allocation and the destruction of frag_queues
into the common place, so this callback will most likely
be optional too).Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
This code works with the generic data types as well, so
move this into inet_fragment.cThis move makes it possible to hide the secret_timer
management and the secret_rebuild routine completely in
the inet_fragment.cIntroduce the ->hashfn() callback in inet_frags() to get
the hashfun for a given inet_frag_queue() object.Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
Since now all the xxx_frag_kill functions now work
with the generic inet_frag_queue data type, this can
be moved into a common place.The xxx_unlink() code is moved as well.
Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
Some sysctl variables are used to tune the frag queues
management and it will be useful to work with them in
a common way in the future, so move them into one
structure, moreover they are the same for all the frag
management codes.I don't place them in the existing inet_frags object,
introduced in the previous patch for two reasons:1. to keep them in the __read_mostly section;
2. not to export the whole inet_frags objects outside.Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
There are some objects that are common in all the places
which are used to keep track of frag queues, they are:* hash table
* LRU list
* rw lock
* rnd number for hash function
* the number of queues
* the amount of memory occupied by queues
* secret timerMove all this stuff into one structure (struct inet_frags)
to make it possible use them uniformly in the future. Like
with the previous patch this mostly consists of hunks like- write_lock(&ipfrag_lock);
+ write_lock(&ip4_frags.lock);To address the issue with exporting the number of queues and
the amount of memory occupied by queues outside the .c file
they are declared in, I introduce a couple of helpers.Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
Introduce the struct inet_frag_queue in include/net/inet_frag.h
file and place there all the common fields from three structs:* struct ipq in ipv4/ip_fragment.c
* struct nf_ct_frag6_queue in nf_conntrack_reasm.c
* struct frag_queue in ipv6/reassembly.cAfter this, replace these fields on appropriate structures with
this structure instance and fix the users to use correct names
i.e. hunks like- atomic_dec(&fq->refcnt);
+ atomic_dec(&fq->q.refcnt);(these occupy most of the patch)
Signed-off-by: Pavel Emelyanov
Signed-off-by: David S. Miller -
Signed-off-by: Ilpo Järvinen
Signed-off-by: David S. Miller -
Uninline netfilter okfns for those cases where gcc can generate tail-calls.
Before:
text data bss dec hex filename
8994153 1016524 524652 10535329 a0c1a1 vmlinuxAfter:
text data bss dec hex filename
8992761 1016524 524652 10533937 a0bc31 vmlinux
-------------------------------------------------------
-1392All cases have been verified to generate tail-calls with and without netfilter.
Signed-off-by: Patrick McHardy
Signed-off-by: David S. Miller -
Signed-off-by: Patrick McHardy
Signed-off-by: David S. Miller -
Now that we don't pass double skb pointers to nf_hook_slow anymore, gcc
can generate tail calls for some of the netfilter hook okfn invocations,
so there is no need to inline the functions anymore. This caused huge
code bloat since we ended up with one inlined version and one out-of-line
version since we pass the address to nf_hook_slow.Before:
text data bss dec hex filename
8997385 1016524 524652 10538561 a0ce41 vmlinuxAfter:
text data bss dec hex filename
8994009 1016524 524652 10535185 a0c111 vmlinux
-------------------------------------------------------
-3376All cases have been verified to generate tail-calls with and without
netfilter. The okfns in ipmr and xfrm4_input still remain inline because
gcc can't generate tail-calls for them.Signed-off-by: Patrick McHardy
Signed-off-by: David S. Miller -
TCP packets all have writable heads, that is, even though it's cloned, it is
writable up to the end of the TCP header. This patch makes skb_checksum_help
aware of this fact by using skb_clone_writable and avoiding a copy for TCP.I've also modified the BUG_ON tests to be unsigned. The only case where this
makes a difference is if csum_start points to a location before skb->data.
Since skb->data should always include the header where the checksum field
is (and all currently callers adhere to that), this change is safe and may
uncover bugs later.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
I got confused by the dual nature of the off variable in the
function pskb_expand_head. The csum_start offset should use
nhead instead of off which can change depending on whether we
are using offsets or pointers.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
The Coverity checker spotted that we'll leak the storage allocated
to 'listeners' in netlink_kernel_create() when the
if (!nl_table[unit].registered)
check is false.This patch avoids the leak.
Signed-off-by: Jesper Juhl
Acked-by: "Eric W. Biederman"
Signed-off-by: David S. Miller -
The Coverity checker spotted that we have already oops'ed if "dst" was
NULL.Since "dst" being NULL doesn't seem to be possible at this point this
patch removes the NULL check.Signed-off-by: Adrian Bunk
Acked-by: Masahide NAKAMURA
Acked-by: Noriaki TAKAMIYA
Signed-off-by: David S. Miller -
This patch replaces unnecessary uses of skb_copy by pskb_expand_head
on the IPv6 input path.This allows us to remove the double pointers later.
Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
This patch implements the same change taht was done to ip_defrag. It
makes ipv6_frag_rcv return the last packet received of a train of fragments
rather than the head of that sequence.This allows us to get rid of the sk_buff ** argument later.
Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
With all the users of the double pointers removed, this patch mops up by
finally replacing all occurances of sk_buff ** in the netfilter API by
sk_buff *.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
This patch replaces unnecessary uses of skb_copy, pskb_copy and
skb_realloc_headroom by functions such as skb_make_writable and
pskb_expand_head.This allows us to remove the double pointers later.
Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
This patch removes the IPVS-specific version of skb_make_writable and
replaces it with the netfilter one.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
Now that all callers of netfilter can guarantee that the skb is not shared,
we no longer have to copy the skb in skb_make_writable.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
Due to the special location of the bridging hook, it should never see a
shared packet anyway (certainly not with any in-kernel code). So it
makes sense to unshare the skb there if necessary as that will greatly
simplify the code below it (in particular, netfilter).Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
As it is we always invoke pt_prev before ing_filter, even if there are no
ingress filters attached. This can cause unnecessary cloning in pt_prev.This patch changes it so that we only invoke pt_prev if there are ingress
filters attached.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
Now that ip_frag always returns the packet given to it on input, we can
change it to return an integer indicating error instead. This patch does
that and updates all its callers accordingly.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller -
This patch is a bit of a hack. However it is worth it if you consider that
this is the only reason why we have to carry around the struct sk_buff **
pointers in netfilter.It makes ip_defrag always return the packet that was given to it on input.
It does this by cloning the packet and replacing its original contents with
the head fragment if necessary.Signed-off-by: Herbert Xu
Signed-off-by: David S. Miller
