| Commit message (Collapse) | Author | Age | Files | Lines |
... | |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
The exportfs encode handle function should return the minimum required
handle size. This helps user to find out the handle size by passing 0
handle size in the first step and then redoing to the call again with
the returned handle size value.
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
New helpers: user_statfs() and fd_statfs(), taking userland pathname and
descriptor resp. and filling struct kstatfs. Syscalls of statfs family
(native, compat and foreign - osf and hpux on alpha and parisc resp.)
switched to those. Removes some boilerplate code, simplifies cleanup
on errors...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
new function: file_open_root(dentry, mnt, name, flags) opens the file
vfs_path_lookup would arrive to.
Note that name can be empty; in that case the usual requirement that
dentry should be a directory is lifted.
open-coded equivalents switched to it, may_open() got down exactly
one caller and became static.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
New lookup flag: LOOKUP_ROOT. nd->root is set (and held) by caller,
path_init() starts walking from that place and all pathname resolution
machinery never drops nd->root if that flag is set. That turns
vfs_path_lookup() into a special case of do_path_lookup() *and*
gets us down to 3 callers of link_path_walk(), making it finally
feasible to rip the handling of trailing symlink out of link_path_walk().
That will not only simply the living hell out of it, but make life
much simpler for unionfs merge. Trailing symlink handling will
become iterative, which is a good thing for stack footprint in
a lot of situations as well.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
That thing has devolved into rats nest of gotos; sane use of unlikely()
gets rid of that horror and gives much more readable structure:
* make a fast attempt to find a dentry; false negatives are OK.
In RCU mode if everything went fine, we are done, otherwise just drop
out of RCU. If we'd done (RCU) ->d_revalidate() and it had not refused
outright (i.e. didn't give us -ECHILD), remember its result.
* now we are not in RCU mode and hopefully have a dentry. If we
do not, lock parent, do full d_lookup() and if that has not found anything,
allocate and call ->lookup(). If we'd done that ->lookup(), remember that
dentry is good and we don't need to revalidate it.
* now we have a dentry. If it has ->d_revalidate() and we can't
skip it, call it.
* hopefully dentry is good; if not, either fail (in case of error)
or try to invalidate it. If d_invalidate() has succeeded, drop it and
retry everything as if original attempt had not found a dentry.
* now we can finish it up - deal with mountpoint crossing and
automount.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
There used to be time when ->d_revalidate() couldn't return an error.
So intents code had lookup_instantiate_filp() stash ERR_PTR(error)
in nd->intent.open.filp and had it checked after lookup_hash(), to
catch the otherwise silent failures. That had been introduced by
commit 4af4c52f34606bdaab6930a845550c6fb02078a4. These days
->d_revalidate() can and does propagate errors back to callers
explicitly, so this check isn't needed anymore.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| | |
... and clean up a bit more
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| | |
We have a bunch of diverging codepaths in do_last(); some of
them converge, but the case of having to create a new file
duplicates large part of common tail of the rest and exits
separately. Massage them so that they could be merged.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| | |
Lift it to lookup_one_len() and link_path_walk() resp. into the
same place where we calculated default hash function of the same
name.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| | |
only one caller left
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
Instead of path_lookupat() doing trailing symlink resolution,
use the same scheme as on the O_CREAT side. Walk with
LOOKUP_PARENT, then (in do_last()) look the final component
up, then either open it or return error or, if it's a symlink,
give the symlink back to path_openat() to be resolved there.
The really messy complication here is RCU. We don't want to drop
out of RCU mode before the final lookup, since we don't want to
bounce parent directory ->d_count without a good reason.
Result is _not_ pretty; later in the series we'll clean it up.
For now we are roughly back where we'd been before the revert
done by Nick's series - top-level logics of path_openat() is
cleaned up, do_last() does actual opening, symlink resolution is
done uniformly.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| | |
Don't stash the struct file * used as starting point of walk in nameidata;
pass file ** to path_init() instead.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
New helper: terminate_walk(). An error has happened during pathname
resolution and we either drop nd->path or terminate RCU, depending
the mode we had been in. After that, nd is essentially empty.
Switch link_path_walk() to using that for cleanup.
Now the top-level logics in link_path_walk() is back to sanity. RCU
dependencies are in the lower-level functions.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| | |
Now we have do_follow_link() guaranteed to leave without dangling RCU
and the next step will get LOOKUP_RCU logics completely out of
link_path_walk().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| | |
getting LOOKUP_RCU checks out of link_path_walk()...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
new helper: path_openat(). Does what do_filp_open() does, except
that it tries only the walk mode (RCU/normal/force revalidation)
it had been told to.
Both create and non-create branches are using path_lookupat() now.
Fixed the double audit_inode() in non-create branch.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| | |
take calculation of open_flags by open(2) arguments into new helper
in fs/open.c, move filp_open() over there, have it and do_sys_open()
use that helper, switch exec.c callers of do_filp_open() to explicit
(and constant) struct open_flags.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
No point messing with passing shitloads of "operation mode" arguments
to do_open() one by one, especially since they are not going to change
during do_filp_open(). Collect them into a struct, fill it and pass
to do_last() by reference.
Make sure that lookup intent flags are correctly set and removed - we
want them for do_last(), but they make no sense for __do_follow_link().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
instead of ad-hackery around need_reval_dot(), do the following:
set a flag (LOOKUP_JUMPED) in the beginning of path, on absolute
symlink traversal, on ".." and on procfs-style symlinks. Clear on
normal components, leave unchanged on ".". Non-nested callers of
link_path_walk() call handle_reval_path(), which checks that flag
is set and that fs does want the final revalidate thing, then does
->d_revalidate(). In link_path_walk() all the return_reval stuff
is gone.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| | |
no need to do it in three places...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
Actual dependency on whether we want RCU or not is in 3 small areas
(as it ought to be) and everything around those is the same in both
versions. Since each function has only one caller and those callers
are on two sides of if (flags & LOOKUP_RCU), it's easier and cleaner
to merge them and pull the checks inside.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| | |
New helper: path_lookupat(). Basically, what do_path_lookup() boils to
modulo -ECHILD/-ESTALE handler. path_walk* family is gone; vfs_path_lookup()
is using link_path_walk() directly, do_path_lookup() and do_filp_open()
are using path_lookupat().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| | |
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| | |
all remaining callers pass LOOKUP_PARENT to it, so
flags argument can die; renamed to kern_path_parent()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
Fix for a dumb preadv()/pwritev() compat bug - unlike the native
variants, compat_... ones forget to check FMODE_P{READ,WRITE}, so e.g.
on pipe the native preadv() will fail with -ESPIPE and compat one will
act as readv() and succeed. Not critical, but it's a clear bug with trivial
fix.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| | |
The new vfs locking scheme introduced in 2.6.38 breaks NFS sillyrename
because the latter relies on being able to determine the parent
directory of the dentry in the ->iput() callback in order to send the
appropriate unlink rpc call.
Looking at the code that cares about races with dput(), there doesn't
seem to be anything that specifically uses d_parent as a test for
whether or not there is a race:
- __d_lookup_rcu(), __d_lookup() all test for d_hashed() after d_parent
- shrink_dcache_for_umount() is safe since nothing else can rearrange
the dentries in that super block.
- have_submount(), select_parent() and d_genocide() can test for a
deletion if we set the DCACHE_DISCONNECTED flag when the dentry
is removed from the parent's d_subdirs list.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org (2.6.38, needs commit c826cb7dfce8 "dcache.c:
create helper function for duplicated functionality" )
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
| |
| |
| |
| |
| |
| |
| |
| |
| | |
This creates a helper function for he "try to ascend into the parent
directory" case, which was written out in triplicate before. With all
the locking and subtle sequence number stuff, we really don't want to
duplicate that kind of code.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|\ \
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
NFS: NFSROOT should default to "proto=udp"
nfs4: remove duplicated #include
NFSv4: nfs4_state_mark_reclaim_nograce() should be static
NFSv4: Fix the setlk error handler
NFSv4.1: Fix the handling of the SEQUENCE status bits
NFSv4/4.1: Fix nfs4_schedule_state_recovery abuses
NFSv4.1 reclaim complete must wait for completion
NFSv4: remove duplicate clientid in struct nfs_client
NFSv4.1: Retry CREATE_SESSION on NFS4ERR_DELAY
sunrpc: Propagate errors from xs_bind() through xs_create_sock()
(try3-resend) Fix nfs_compat_user_ino64 so it doesn't cause problems if bit 31 or 63 are set in fileid
nfs: fix compilation warning
nfs: add kmalloc return value check in decode_and_add_ds
SUNRPC: Remove resource leak in svc_rdma_send_error()
nfs: close NFSv4 COMMIT vs. CLOSE race
SUNRPC: Close a race in __rpc_wait_for_completion_task()
|
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
There have been a number of recent reports that NFSROOT is no longer
working with default mount options, but fails only with certain NICs.
Brian Downing <bdowning@lavos.net> bisected to commit 56463e50 "NFS:
Use super.c for NFSROOT mount option parsing". Among other things,
this commit changes the default mount options for NFSROOT to use TCP
instead of UDP as the underlying transport.
TCP seems less able to deal with NICs that are slow to initialize.
The system logs that have accompanied reports of problems all show
that NFSROOT attempts to establish a TCP connection before the NIC is
fully initialized, and thus the TCP connection attempt fails.
When a TCP connection attempt fails during a mount operation, the
NFS stack needs to fail the operation. Usually user space knows how
and when to retry it. The network layer does not report a distinct
error code for this particular failure mode. Thus, there isn't a
clean way for the RPC client to see that it needs to retry in this
case, but not in others.
Because NFSROOT is used in some environments where it is not possible
to update the kernel command line to specify "udp", the proper thing
to do is change NFSROOT to use UDP by default, as it did before commit
56463e50.
To make it easier to see how to change default mount options for
NFSROOT and to distinguish default settings from mandatory settings,
I've adjusted a couple of areas to document the specifics.
root_nfs_cat() is also modified to deal with commas properly when
concatenating strings containing mount option lists. This keeps
root_nfs_cat() call sites simpler, now that we may be concatenating
multiple mount option strings.
Tested-by: Brian Downing <bdowning@lavos.net>
Tested-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: <stable@kernel.org> # 2.6.37
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
Remove duplicated #include('s) in
fs/nfs/nfs4proc.c
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
There are no more external users of nfs4_state_mark_reclaim_nograce() or
nfs4_state_mark_reclaim_reboot(), so mark them as static.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | | |
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
We want SEQUENCE status bits to be handled by the state manager in order
to avoid threading issues.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
nfs4_schedule_state_recovery() should only be used when we need to force
the state manager to check the lease. If we just want to start the
state manager in order to handle a state recovery situation, we should be
using nfs4_schedule_state_manager().
This patch fixes the abuses of nfs4_schedule_state_recovery() by replacing
its use with a set of helper functions that do the right thing.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | | |
Signed-off-by: Andy Adamson <andros@netapp.com>
[Trond: fix whitespace errors]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | | |
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
Fix bug where we currently retry the EXCHANGEID call again, eventhough
we already have a valid clientid. Instead, delay and retry the CREATE_SESSION
call.
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
31 or 63 are set in fileid
The problem was use of an int32, which when converted to a uint64
is sign extended resulting in a fileid that doesn't fit in 32 bits
even though the intent of the function is to fit the fileid into
32 bits.
Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
[Trond: Added an include for compat.h]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
this commit fix compilation warning as following:
linux-2.6/fs/nfs/nfs4proc.c:3265: warning: comparison of distinct pointer types lacks a cast
Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
add kmalloc return value check in decode_and_add_ds
Signed-off-by: Stanislav Fomichev <kernel@fomichev.me>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | | |
I've been adding in more artificial delays in the NFSv4 commit and close
codepaths to uncover races. The kernel I'm testing has the patch to
close the race in __rpc_wait_for_completion_task that's in Trond's
cthon2011 branch. The reproducer I've been using does this in a loop:
mkdir("DIR");
fd = open("DIR/FILE", O_WRONLY|O_CREAT|O_EXCL, 0644);
write(fd, "abcdefg", 7);
close(fd);
unlink("DIR/FILE");
rmdir("DIR");
The above reproducer shouldn't result in any silly-renaming. However,
when I add a "msleep(100)" just after the nfs_commit_clear_lock call in
nfs_commit_release, I can almost always force one to occur. If I can
force it to occur with that, then it can happen without that delay
given the right timing.
nfs_commit_inode waits for the NFS_INO_COMMIT bit to clear when called
with FLUSH_SYNC set. nfs_commit_rpcsetup on the other hand does not wait
for the task to complete before putting its reference to it, so the last
reference get put in rpc_release task and gets queued to a workqueue.
In this situation, the last open context reference may be put by the
COMMIT release instead of the close() syscall. The close() syscall
returns too quickly and the unlink runs while the d_count is still
high since the COMMIT release hasn't put its dentry reference yet.
Fix this by having rpc_commit_rpcsetup wait for the RPC call to complete
before putting the task reference when FLUSH_SYNC is set. With this, the
last reference is put by the process that's initiating the FLUSH_SYNC
commit and the race is closed.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
|