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* New helper - current_umask()Al Viro2009-03-312-4/+4
| | | | | | | current->fs->umask is what most of fs_struct users are doing. Put that into a helper function. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* proc 2/2: remove struct proc_dir_entry::ownerAlexey Dobriyan2009-03-311-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy as correctly noted at bug #12454. Someone can lookup entry with NULL ->owner, thus not pinning enything, and release it later resulting in module refcount underflow. We can keep ->owner and supply it at registration time like ->proc_fops and ->data. But this leaves ->owner as easy-manipulative field (just one C assignment) and somebody will forget to unpin previous/pin current module when switching ->owner. ->proc_fops is declared as "const" which should give some thoughts. ->read_proc/->write_proc were just fixed to not require ->owner for protection. rmmod'ed directories will be empty and return "." and ".." -- no harm. And directories with tricky enough readdir and lookup shouldn't be modular. We definitely don't want such modular code. Removing ->owner will also make PDE smaller. So, let's nuke it. Kudos to Jeff Layton for reminding about this, let's say, oversight. http://bugzilla.kernel.org/show_bug.cgi?id=12454 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* constify dentry_operations: NFSAl Viro2009-03-272-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* NFS: Fix the fix to Bugzilla #11061, when IPv6 isn't defined...Trond Myklebust2009-03-121-29/+39
| | | | | | | | | | | | | | | | | Stephen Rothwell reports: Today's linux-next build (powerpc ppc64_defconfig) failed like this: fs/built-in.o: In function `.nfs_get_client': client.c:(.text+0x115010): undefined reference to `.__ipv6_addr_type' Fix by moving the IPV6 specific parts of commit d7371c41b0cda782256b1df759df4e8d4724584c ("Bug 11061, NFS mounts dropped") into the '#ifdef IPV6..." section. Also fix up a couple of formatting issues. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* Bug 11061, NFS mounts droppedIan Dall2009-03-101-1/+62
| | | | | | | | | | | | | | | Addresses: http://bugzilla.kernel.org/show_bug.cgi?id=11061 sockaddr structures can't be reliably compared using memcmp() because there are padding bytes in the structure which can't be guaranteed to be the same even when the sockaddr structures refer to the same socket. Instead compare all the relevant fields. In the case of IPv6 sin6_flowinfo is not compared because it only affects QoS and sin6_scope_id is only compared if the address is "link local" because "link local" addresses need only be unique to a specific link. Signed-off-by: Ian Dall <ian@beware.dropbear.id.au> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Handle -ESTALE error in access()Suresh Jayaraman2009-03-101-1/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hi Trond, I have been looking at a bugreport where trying to open applications on KDE on a NFS mounted home fails temporarily. There have been multiple reports on different kernel versions pointing to this common issue: http://bugzilla.kernel.org/show_bug.cgi?id=12557 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/269954 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=508866.html This issue can be reproducible consistently by doing this on a NFS mounted home (KDE): 1. Open 2 xterm sessions 2. From one of the xterm session, do "ssh -X <remote host>" 3. "stat ~/.Xauthority" on the remote SSH session 4. Close the two xterm sessions 5. On the server do a "stat ~/.Xauthority" 6. Now on the client, try to open xterm This will fail. Even if the filehandle had become stale, the NFS client should invalidate the cache/inode and should repeat LOOKUP. Looking at the packet capture when the failure occurs shows that there were two subsequent ACCESS() calls with the same filehandle and both fails with -ESTALE error. I have tested the fix below. Now the client issue a LOOKUP after the ACCESS() call fails with -ESTALE. If all this makes sense to you, can you consider this for inclusion? Thanks, If the server returns an -ESTALE error due to stale filehandle in response to an ACCESS() call, we need to invalidate the cache and inode so that LOOKUP() can be retried. Without this change, the nfs client retries ACCESS() with the same filehandle, fails again and could lead to temporary failure of applications running on nfs mounted home. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFSv3: Fix posix ACL codeTrond Myklebust2009-03-102-27/+34
| | | | | | | | | | | | | Fix a memory leak due to allocation in the XDR layer. In cases where the RPC call needs to be retransmitted, we end up allocating new pages without clearing the old ones. Fix this by moving the allocation into nfs3_proc_setacls(). Also fix an issue discovered by Kevin Rudd, whereby the amount of memory reserved for the acls in the xdr_buf->head was miscalculated, and causing corruption. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Fix misparsing of nfsv4 fs_locations attribute (take 2)Trond Myklebust2009-03-101-7/+8
| | | | | | | | | | The changeset ea31a4437c59219bf3ea946d58984b01a45a289c (nfs: Fix misparsing of nfsv4 fs_locations attribute) causes the mountpath that is calculated at the beginning of try_location() to be clobbered when we later strncpy a non-nul terminated hostname using an incorrect buffer length. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* fs/Kconfig: move nfs outAlexey Dobriyan2009-01-221-0/+86
| | | | Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* fs: symlink write_begin allocation context fixNick Piggin2009-01-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the write_begin/write_end aops, page_symlink was broken because it could no longer pass a GFP_NOFS type mask into the point where the allocations happened. They are done in write_begin, which would always assume that the filesystem can be entered from reclaim. This bug could cause filesystem deadlocks. The funny thing with having a gfp_t mask there is that it doesn't really allow the caller to arbitrarily tinker with the context in which it can be called. It couldn't ever be GFP_ATOMIC, for example, because it needs to take the page lock. The only thing any callers care about is __GFP_FS anyway, so turn that into a single flag. Add a new flag for write_begin, AOP_FLAG_NOFS. Filesystems can now act on this flag in their write_begin function. Change __grab_cache_page to accept a nofs argument as well, to honour that flag (while we're there, change the name to grab_cache_page_write_begin which is more instructive and does away with random leading underscores). This is really a more flexible way to go in the end anyway -- if a filesystem happens to want any extra allocations aside from the pagecache ones in ints write_begin function, it may now use GFP_KERNEL (rather than GFP_NOFS) for common case allocations (eg. ocfs2_alloc_write_ctxt, for a random example). [kosaki.motohiro@jp.fujitsu.com: fix ubifs] [kosaki.motohiro@jp.fujitsu.com: fix fuse] Signed-off-by: Nick Piggin <npiggin@suse.de> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: <stable@kernel.org> [2.6.28.x] Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> [ Cleaned up the calling convention: just pass in the AOP flags untouched to the grab_cache_page_write_begin() function. That just simplifies everybody, and may even allow future expansion of the logic. - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'devel' into nextTrond Myklebust2008-12-3016-1279/+1442
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| * fs/nfs/nfs4proc.c: make nfs4_map_errors() staticWANG Cong2008-12-302-2/+1
| | | | | | | | | | | | | | | | | | | | nfs4_map_errors() can become static. Signed-off-by: WANG Cong <wangcong@zeuux.org> Cc: J. Bruce Fields <bfields@fieldses.org> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * rpc: allow gss callbacks to clientOlga Kornievskaia2008-12-231-5/+31
| | | | | | | | | | | | | | | | | | This patch adds client-side support to allow for callbacks other than AUTH_SYS. Signed-off-by: Olga Kornievskaia <aglo@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: remove unused status from encode routinesAndy Adamson2008-12-231-398/+180
| | | | | | | | | | | | Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: increment number of operations in each encode routineAndy Adamson2008-12-231-170/+247
| | | | | | | | | | | | Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: fix comment placement in nfs4xdr.cBenny Halevy2008-12-231-4/+4
| | | | | | | | | | Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: fix tabs in nfs4xdr.cAndy Adamson2008-12-231-245/+245
| | | | | | | | | | | | Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: remove white space from nfs4xdr.cAndy Adamson2008-12-231-33/+29
| | | | | | | | | | | | | | | | Clean-up Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * nfs: remove incorrect usage of nfs4 compound response hdr.statusBenny Halevy2008-12-231-6/+0
| | | | | | | | | | | | | | | | | | | | | | 3 call sites look at hdr.status before returning success. hdr.status must be zero in this case so there's no point in this. Currently, hdr.status is correctly processed at decode_op_hdr time if the op status cannot be decoded. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * nfs: return compound hdr.status when there are no op repliesBenny Halevy2008-12-231-0/+2
| | | | | | | | | | | | | | | | | | | | When there are no op replies encoded in the compound reply hdr.status still contains the overall status of the compound rpc. This can happen, e.g., when the server returns a NFS4ERR_MINOR_VERS_MISMATCH error. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Fix an infinite loop in the NFS state recovery codeTrond Myklebust2008-12-231-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | Marten Gajda <marten.gajda@fernuni-hagen.de> states: I tracked the problem down to the function nfs4_do_open_expired. Within this function _nfs4_open_expired is called and may return -NFS4ERR_DELAY. When a further call to _nfs4_open_expired is executed and does not return -NFS4ERR_DELAY the "exception.retry" variable is not reset to 0, causing the loop to iterate again (and as long as err != -NFS4ERR_DELAY, probably forever) Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * optimize attribute timeouts for "noac" and "actimeo=0"Peter Staubach2008-12-232-10/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hi. I've been looking at a bugzilla which describes a problem where a customer was advised to use either the "noac" or "actimeo=0" mount options to solve a consistency problem that they were seeing in the file attributes. It turned out that this solution did not work reliably for them because sometimes, the local attribute cache was believed to be valid and not timed out. (With an attribute cache timeout of 0, the cache should always appear to be timed out.) In looking at this situation, it appears to me that the problem is that the attribute cache timeout code has an off-by-one error in it. It is assuming that the cache is valid in the region, [read_cache_jiffies, read_cache_jiffies + attrtimeo]. The cache should be considered valid only in the region, [read_cache_jiffies, read_cache_jiffies + attrtimeo). With this change, the options, "noac" and "actimeo=0", work as originally expected. This problem was previously addressed by special casing the attrtimeo == 0 case. However, since the problem is only an off- by-one error, the cleaner solution is address the off-by-one error and thus, not require the special case. Thanx... ps Signed-off-by: Peter Staubach <staubach@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Convert the open and close ops to use fmodeTrond Myklebust2008-12-235-80/+90
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: Use delegations to optimise ACCESS callsTrond Myklebust2008-12-231-1/+2
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Ensure that we set the verifier when revalidating delegated dentriesTrond Myklebust2008-12-231-2/+4
| | | | | | | | | | | | | | This ensures that we don't have to look up the dentry again after we return the delegation if we know that the directory didn't change. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Clean up is_atomic_open()Trond Myklebust2008-12-231-7/+8
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Convert delegation->type field to fmode_tTrond Myklebust2008-12-233-6/+6
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Fix up delegation callbacksTrond Myklebust2008-12-231-19/+38
| | | | | | | | | | | | | | Currently, the callback server is listening on IPv6 if it is enabled. This means that IPv4 addresses will always be mapped. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Return unreferenced delegations more promptlyTrond Myklebust2008-12-234-13/+49
| | | | | | | | | | | | | | | | | | If the client is not using a delegation, the right thing to do is to return it as soon as possible. This helps reduce the amount of state the server has to track, as well as reducing the potential for conflicts with other clients. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Clean up the asynchronous delegation returnTrond Myklebust2008-12-231-54/+19
| | | | | | | | | | | | | | Reuse the state management thread in order to return delegations when we get a callback. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Clean up nfs_expire_all_delegations()Trond Myklebust2008-12-234-34/+16
| | | | | | | | | | | | | | Let the actual delegreturn stuff be run in the state manager thread rather than allocating a separate kthread. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Fix a BAD_SEQUENCEID condition.Trond Myklebust2008-12-231-2/+0
| | | | | | | | | | | | | | | | | | | | We really shouldn't be resetting the sequence ids when doing state expiration recovery, since we don't know if the server still remembers our previous state owners. There are servers out there that do attempt to preserve client state even if the lease has expired. Such a server would only release that state if a conflicting OPEN request occurs. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Don't exit the state management if there are still tasks to doTrond Myklebust2008-12-231-2/+6
| | | | | | | | | | | | Fix up a potential race... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Rename the state reclaimer threadTrond Myklebust2008-12-234-25/+32
| | | | | | | | | | | | It is really a more general purpose state management thread at this point. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Clean up NFS4ERR_CB_PATH_DOWN error management...Trond Myklebust2008-12-234-10/+16
| | | | | | | | | | | | | | Add a delegation cleanup phase to the state management loop, and do the NFS4ERR_CB_PATH_DOWN recovery there. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Clean up the support for returning multiple delegationsTrond Myklebust2008-12-233-55/+52
| | | | | | | | | | | | | | | | | | Add a flag to mark delegations as requiring return, then run a garbage collector. In the future, this will allow for more flexible delegation management, where delegations may be marked for return if it turns out that they are not being referenced. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Add recovery for individual stateidsTrond Myklebust2008-12-233-10/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NFSv4 defines a number of state errors which the client does not currently handle. Among those we should worry about are: NFS4ERR_ADMIN_REVOKED - the server's administrator revoked our locks and/or delegations. NFS4ERR_BAD_STATEID - the client and server are out of sync, possibly due to a delegation return racing with an OPEN request. NFS4ERR_OPENMODE - the client attempted to do something not sanctioned by the open mode of the stateid. Should normally just occur as a result of a delegation return race. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Remove nfs_client->cl_semTrond Myklebust2008-12-235-45/+1
| | | | | | | | | | | | | | | | | | | | Now that we're using the flags to indicate state that needs to be recovered, as well as having implemented proper refcounting and spinlocking on the state and open_owners, we can get rid of nfs_client->cl_sem. The only remaining case that was dubious was the file locking, and that case is now covered by the nfsi->rwsem. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Ensure that file unlock requests don't conflict with state recoveryTrond Myklebust2008-12-232-10/+20
| | | | | | | | | | | | | | | | | | | | The unlock path is currently failing to take the nfs_client->cl_sem read lock, and hence the recovery path may see locks disappear from underneath it. Also ensure that it takes the nfs_inode->rwsem read lock so that it there is no conflict with delegation recalls. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: Remove the unnecessary argument to nfs4_wait_clnt_recover()Trond Myklebust2008-12-231-76/+75
| | | | | | | | | | | | | | ...and move some code around in order to clear out an unnecessary forward declaration. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Ensure that nfs4_reclaim_open_state() doesn't depend on cl_semTrond Myklebust2008-12-231-1/+10
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Add a recovery marking scheme for state ownersTrond Myklebust2008-12-233-4/+26
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Don't tell server we rebooted when not necessaryTrond Myklebust2008-12-231-11/+11
| | | | | | | | | | | | Instead of doing a full setclientid, try doing a RENEW call first. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Remove redundant RENEW calls if we know the lease has expiredTrond Myklebust2008-12-233-19/+32
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Fix state recovery when the client runs over the grace periodTrond Myklebust2008-12-233-49/+155
| | | | | | | | | | | | | | | | | | If the client for some reason is not able to recover all its state within the time allotted for the grace period, and the server reboots again, the client is not allowed to recover the state that was 'lost' using reboot recovery. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Callers to nfs4_get_renew_cred() need to hold nfs_client->cl_lockTrond Myklebust2008-12-233-7/+17
| | | | | | | | | | | | Ditto for nfs4_get_setclientid_cred(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Clean up for the state loss reclaimerTrond Myklebust2008-12-231-49/+81
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: Use atomic bitops when changing struct nfs_delegation->flagsTrond Myklebust2008-12-233-9/+9
| | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Fix up the dereferencing of delegation->inodeTrond Myklebust2008-12-231-8/+31
| | | | | | | | | | | | | | | | Without an extra lock, we cannot just assume that the delegation->inode is valid when we're traversing the rcu-protected nfs_client lists. Use the delegation->lock to ensure that it is truly valid. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFSv4: Fix up another delegation related raceTrond Myklebust2008-12-233-28/+60
| | | | | | | | | | | | | | | | | | When we can update_open_stateid(), we need to be certain that we don't race with a delegation return. While we could do this by grabbing the nfs_client->cl_lock, a dedicated spin lock in the delegation structure will scale better. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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