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2007-12-12NFS: Fix an Oops in NFS unmountTrond Myklebust
Ensure that the dummy 'root dentry' is invisible to d_find_alias(). If not, then it may be spliced into the tree if a parent directory from the same filesystem gets mounted at a later time. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-12-12Revert "NFS: Ensure we return zero if applications attempt to write zero bytes"Trond Myklebust
This reverts commit b9148c6b80d802dbc2a7530b29915a80432e50c7. On Wed, 12 Dec 2007 10:57:30 -0500, Chuck Lever wrote > commit b9148c6b should be reverted. It was recently forward-ported > from some years-old patches, and is clearly not needed now. > > On Dec 11, 2007, at 5:21 PM, Adrian Bunk wrote: > >> This code became dead after commit >> b9148c6b80d802dbc2a7530b29915a80432e50c7 >> (which BTW doesn't seem to have changed any behaviour) and can >> therefore >> be removed. >> >> Spotted by the Coverity checker. >> >> Signed-off-by: Adrian Bunk <bunk@kernel.org> >> >> --- >> --- linux-2.6/fs/nfs/direct.c.old 2007-12-02 21:54:53.000000000 +0100 >> +++ linux-2.6/fs/nfs/direct.c 2007-12-02 21:55:10.000000000 +0100 >> @@ -897,15 +897,12 @@ ssize_t nfs_file_direct_write(struct kio >> if (!count) >> goto out; /* return 0 */ >> >> retval = -EINVAL; >> if ((ssize_t) count < 0) >> goto out; >> - retval = 0; >> - if (!count) >> - goto out; >> >> retval = nfs_sync_mapping(mapping); >> if (retval) >> goto out; >> >> retval = nfs_direct_write(iocb, iov, nr_segs, pos, count); >> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-12-11NFSv2/v3: Fix a memory leak when using -onolockTrond Myklebust
Neil Brown said: > Hi Trond, > > We found that a machine which made moderately heavy use of > 'automount' was leaking some nfs data structures - particularly the > 4K allocated by rpc_alloc_iostats. > It turns out that this only happens with filesystems with -onolock > set. > The problem is that if NFS_MOUNT_NONLM is set, nfs_start_lockd doesn't > set server->destroy, so when the filesystem is unmounted, the > ->client_acl is not shutdown, and so several resources are still > held. Multiple mount/umount cycles will slowly eat away memory > several pages at a time. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: NeilBrown <neilb@suse.de>
2007-12-11NFS: Fix NFS mountpoint crossing...Trond Myklebust
The check that was added to nfs_xdev_get_sb() to work around broken servers, works fine for NFSv2, but causes mountpoint crossing on NFSv3 to always return ESTALE. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-26NFS: Clean up new multi-segment direct I/O changesChuck Lever
Simplify calling sequence of nfs_direct_{read,write}_schedule(), and rename them to reflect their new role. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-26NFS: Ensure we return zero if applications attempt to write zero bytesChuck Lever
A zero byte count direct write request should be a successful no-op, not an error. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-26NFS: Support multiple segment iovecs in the NFS direct I/O pathChuck Lever
Allow applications to perform asynchronous scatter-gather direct I/O to NFS files. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-26NFS: Introduce iovec I/O helpers to fs/nfs/direct.cChuck Lever
Add helpers that iterate over multi-segment iovecs. These will be used to support multi-segment scatter/gather direct I/O in a later patch. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-26NFS: fs/nfs/dir.c should #include "internal.h"Adrian Bunk
Every file should include the headers containing the prototypes for its global functions (in this case nfs_access_cache_shrinker()). Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-26NFS: make nfs_wb_page_priority() staticAdrian Bunk
nfs_wb_page_priority() can now become static. Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-26NFS: mount failure causes bad page stateRussell King
While testing a kernel based upon ecd744eec3aa8bbc949ec04ed3fbf7ecb2958a0e (with wrong boot arguments), I got the following bad page state entry while NFS was trying to mount it's rootfs: IP-Config: Complete: device=eth0, addr=192.168.1.101, mask=255.255.255.0, gw=255.255.255.255, host=192.168.1.101, domain=, nis-domain=(none), bootserver=192.168.1.100, rootserver=192.168.1.100, rootpath= Looking up port of RPC 100003/2 on 192.168.1.100 rpcbind: server 192.168.1.100 not responding, timed out Root-NFS: Unable to get nfsd port number from server, using default Looking up port of RPC 100005/1 on 192.168.1.100 rpcbind: server 192.168.1.100 not responding, timed out Root-NFS: Unable to get mountd port number from server, using default mount: server 192.168.1.100 not responding, timed out Root-NFS: Server returned error -5 while mounting /nfs/rootfs/ VFS: Unable to mount root fs via NFS, trying floppy. Bad page state in process 'swapper' page:c02b1260 flags:0x00000400 mapping:00000000 mapcount:0 count:0 Trying to fix it up, but a reboot is needed Backtrace: [<c0023e34>] (dump_stack+0x0/0x14) from [<c0062570>] (bad_page+0x70/0xac) [<c0062500>] (bad_page+0x0/0xac) from [<c0064914>] (free_hot_cold_page+0x80/0x178) [<c0064894>] (free_hot_cold_page+0x0/0x178) from [<c0064a74>] (free_hot_page+0x14/0x18) [<c0064a60>] (free_hot_page+0x0/0x18) from [<c0067078>] (put_page+0xf8/0x154) [<c0066f80>] (put_page+0x0/0x154) from [<c007dbc8>] (kfree+0xc8/0xd0) [<c007db00>] (kfree+0x0/0xd0) from [<c00cbb54>] (nfs_get_sb+0x230/0x710) [<c00cb924>] (nfs_get_sb+0x0/0x710) from [<c0084334>] (vfs_kern_mount+0x58/0xac)[<c00842dc>] (vfs_kern_mount+0x0/0xac) from [<c00843c0>] (do_kern_mount+0x38/0xf4) [<c0084388>] (do_kern_mount+0x0/0xf4) from [<c0099c7c>] (do_mount+0x1e8/0x614) ... This seems to be caused by use of an uninitialised structure due to NULL options being passed to nfs_validate_mount_data(). Ensure that the parsed mount data is always initialised. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> (Trond: added fix for the same bug in nfs4_validate_mount_data()). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-17kernel BUG at fs/nfs/namespace.c:108! - can be triggered by bad serverNeil Brown
Hi Trond, I have discovered that the BUG_ON in nfs_follow_mountpoint: BUG_ON(IS_ROOT(dentry)); can be triggered by a misbehaving server. What happens is the client does a lookup and discoveres that the named directory has a different fsid, so it initiates a mount. It then performs a GETATTR on the mounted directory and gets a different fsid again (due to a bug in the NFS server). This causes nfs_follow_mountpoint to be called on the newly mounted root, which triggers the BUG_ON. To duplicate this, have a directory which contains some mountpoints, and export that directory with the "crossmnt" flag using nfs-utils 1.1.1 (or 1.1.0 I think) The GETATTR on the root of the mounted filesystem will return the information for the top exportpoint, while a lookup will return the correct information. This difference causes the NFS client to BUG. I think the best way to fix this is to trap this possibility early, so just before completing the mount in the NFS client, check that it isn't going to use nfs_mountpoint_inode_operations. As long as i_op will never change once set (is that true?), this should be adequately safe. The following patch shows a possible approach, and it works for me. i.e. when the NFS server is misbehaving, I get ESTALE on those mountpoints, while when the NFS server is working correctly, I get correct behaviour on the client. NeilBrown Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-17NFS: Fix the ustat() regressionTrond Myklebust
Since 2.6.18, the superblock sb->s_root has been a dummy dentry with a dummy inode. This breaks ustat(), which actually uses sb->s_root in a vfstat() call. Fix this by making the s_root a dummy alias to the directory inode that was used when creating the superblock. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-23NFS: Fix for bug in handling of errors for O_DIRECT writesNeil Brown
Commit eda3cef8dd2b83875affe82595db9d0c278879b2 ("NFS: Fix error handling in nfs_direct_write_result()") ensured that if a WRITE returns an error, then data->res.verf->committed is not tested (as it is not initialised). Then commit 60fa3f769f7651a60125a0f44e3ffe3246d7cf39 ("NFS: Fix two bugs in the O_DIRECT write code") inadvertently reverted this while fixing other problems. So move the test so that we never examine ->committed in an error case, and fix a speeling error while we are there. Cc: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Neil Brown <neilb@suse.de> Acked-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-21NFS: Fix a typo in nfs_call_unlink()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-21NFSv2: Ensure that the directory metadata gets revalidated on file createTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivialLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial: (74 commits) fix do_sys_open() prototype sysfs: trivial: fix sysfs_create_file kerneldoc spelling mistake Documentation: Fix typo in SubmitChecklist. Typo: depricated -> deprecated Add missing profile=kvm option to Documentation/kernel-parameters.txt fix typo about TBI in e1000 comment proc.txt: Add /proc/stat field small documentation fixes Fix compiler warning in smount example program from sharedsubtree.txt docs/sysfs: add missing word to sysfs attribute explanation documentation/ext3: grammar fixes Documentation/java.txt: typo and grammar fixes Documentation/filesystems/vfs.txt: typo fix include/asm-*/system.h: remove unused set_rmb(), set_wmb() macros trivial copy_data_pages() tidy up Fix typo in arch/x86/kernel/tsc_32.c file link fix for Pegasus USB net driver help remove unused return within void return function Typo fixes retrun -> return x86 hpet.h: remove broken links ...
2007-10-19Avoid compile error in fs/nfs/unlink.cLinus Torvalds
Erez Zadok reports that certain configurations fail to build due to schedule() TASK_[UN]INTERRUPTIBLE not being declared. Add proper include files to fix. Cc: Erez Zadok <ezk@cs.sunysb.edu> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19nfs: Fix build break with CONFIG_NFS_V4=nOlof Johansson
Signed-off-by: Olof Johansson <olof@lixom.net> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19Convert files to UTF-8 and some cleanupsJan Engelhardt
* Convert files to UTF-8. * Also correct some people's names (one example is Eißfeldt, which was found in a source file. Given that the author used an ß at all in a source file indicates that the real name has in fact a 'ß' and not an 'ss', which is commonly used as a substitute for 'ß' when limited to 7bit.) * Correct town names (Goettingen -> Göttingen) * Update Eberhard Mönkeberg's address (http://lkml.org/lkml/2007/1/8/313) Signed-off-by: Jan Engelhardt <jengelh@gmx.de> Signed-off-by: Adrian Bunk <bunk@kernel.org>
2007-10-19NFSv4: Fix an rpc_cred reference leakage in fs/nfs/delegation.cTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19NFSv4: Ensure that we wait for the CLOSE request to completeTrond Myklebust
Otherwise, we do end up breaking close-to-open semantics. We also end up breaking some of the silly-rename tests in Connectathon on some setups. Please refer to the bug-report at http://bugzilla.linux-nfs.org/show_bug.cgi?id=150 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19NFS: Fix a race in sillyrenameTrond Myklebust
lookup() and sillyrename() can race one another because the sillyrename() completion cannot take the parent directory's inode->i_mutex since the latter may be held by whoever is calling dput(). We therefore have little option but to add extra locking to ensure that nfs_lookup() and nfs_atomic_open() do not race with the sillyrename completion. If somebody has looked up the sillyrenamed file in the meantime, we just transfer the sillydelete information to the new dentry. Please refer to the bug-report at http://bugzilla.linux-nfs.org/show_bug.cgi?id=150 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19NFS: Fix a writeback race...Trond Myklebust
This patch fixes a regression that was introduced by commit 44dd151d5c21234cc534c47d7382f5c28c3143cd We cannot zero the user page in nfs_mark_uptodate() any more, since a) We'd be modifying the page without holding the page lock b) We can race with other updates of the page, most notably because of the call to nfs_wb_page() in nfs_writepage_setup(). Instead, we do the zeroing in nfs_update_request() if we see that we're creating a request that might potentially be marked as up to date. Thanks to Olivier Paquet for reporting the bug and providing a test-case. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-18NFS: if ATTR_KILL_S*ID bits are set, then skip mode changeJeff Layton
If the ATTR_KILL_S*ID bits are set then any mode change is only for clearing the setuid/setgid bits. For NFS, skip the mode change and let the server handle it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Slab API: remove useless ctor parameter and reorder parametersChristoph Lameter
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 <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17mm: count reclaimable pages per BDIPeter Zijlstra
Count per BDI reclaimable pages; nr_reclaimable = nr_dirty + nr_unstable. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17mm: bdi init hooksPeter Zijlstra
provide BDI constructor/destructor hooks [akpm@linux-foundation.org: compile fix] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17nfs: remove congestion_end()Peter Zijlstra
These patches aim to improve balance_dirty_pages() and directly address three issues: 1) inter device starvation 2) stacked device deadlocks 3) inter process starvation 1 and 2 are a direct result from removing the global dirty limit and using per device dirty limits. By giving each device its own dirty limit is will no longer starve another device, and the cyclic dependancy on the dirty limit is broken. In order to efficiently distribute the dirty limit across the independant devices a floating proportion is used, this will allocate a share of the total limit proportional to the device's recent activity. 3 is done by also scaling the dirty limit proportional to the current task's recent dirty rate. This patch: nfs: remove congestion_end(). It's redundant, clear_bdi_congested() already wakes the waiters. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16nfs: convert to new aopsNick Piggin
[akpm@linux-foundation.org: fix against git-nfs] [peterz@infradead.org: fix against git-nfs] Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-15Merge branch 'locks' of git://linux-nfs.org/~bfields/linuxLinus Torvalds
* 'locks' of git://linux-nfs.org/~bfields/linux: nfsd: remove IS_ISMNDLCK macro Rework /proc/locks via seq_files and seq_list helpers fs/locks.c: use list_for_each_entry() instead of list_for_each() NFS: clean up explicit check for mandatory locks AFS: clean up explicit check for mandatory locks 9PFS: clean up explicit check for mandatory locks GFS2: clean up explicit check for mandatory locks Cleanup macros for distinguishing mandatory locks Documentation: move locks.txt in filesystems/ locks: add warning about mandatory locking races Documentation: move mandatory locking documentation to filesystems/ locks: Fix potential OOPS in generic_setlease() Use list_first_entry in locks_wake_up_blocks locks: fix flock_lock_file() comment Memory shortage can result in inconsistent flocks state locks: kill redundant local variable locks: reverse order of posix_locks_conflict() arguments
2007-10-11NFSv4: Fix a typo in nfs_inode_reclaim_delegationTrond Myklebust
We were intending to put the previous instance of delegation->cred before setting a new one. Thanks to David Howells for spotting this. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: clean up explicit check for mandatory locksPavel Emelyanov
The __mandatory_lock(inode) macro makes the same check, but makes the code more readable. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2007-10-09NFS: Add a boot parameter to disable 64 bit inode numbersTrond Myklebust
This boot parameter will allow legacy 32-bit applications which call stat() to continue to function even if the NFSv3/v4 server uses 64-bit inode numbers. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: nfs_refresh_inode should clear cache_validity flags on successTrond Myklebust
If the cached attributes match the ones supplied in the fattr, then assume we've revalidated the inode. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Fix a connectathon regression in NFSv3 and NFSv4Trond Myklebust
We're failing basic test6 against Linux servers because they lack a correct change attribute. The fix is to assume that we always want to invalidate the readdir caches when we call update_changeattr and/or nfs_post_op_update_inode on a directory. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Use nfs_refresh_inode() in ops that aren't expected to change the inodeTrond Myklebust
nfs_post_op_update_inode() is really only meant to be used if we expect the inode and its attributes to have changed in some way. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Get rid of some obsolete macrosTrond Myklebust
- NFS_READTIME, NFS_CHANGE_ATTR are completely unused. - Inline the few remaining uses of NFS_ATTRTIMEO, and remove. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Simplify filehandle revalidationTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Ensure that nfs_link() returns a hashed dentryTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Be strict about dentry revalidation when doing exclusive createTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Don't zap the readdir caches upon errorTrond Myklebust
If necessary, the caches will get zapped under normal revalidation. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Remove the redundant nfs_reval_fsid()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFSv3: Always use directory post-op attributes in nfs3_proc_lookupTrond Myklebust
LOOKUP returns the directory post-op attributes whether or not the operation was successful. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFSv4: Fix nfs_atomic_open() to set the verifier on negative dentries tooTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFSv4: Use NFSv2/v3 rules for negative dentries in nfs_open_revalidateTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFSv4: Don't revalidate the directory in nfs_atomic_lookup()Trond Myklebust
Why bother, since the call to nfs4_atomic_open() will do it for us. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Optimise nfs_lookup_revalidate()Trond Myklebust
We don't need to call nfs_revalidate_inode() on the directory if we already know that the verifiers don't match. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Reset nfsi->last_updated only if the attribute changedTrond Myklebust
Otherwise set it to nfsi->read_cache_jiffies in order to prevent jiffy wraparound issues. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-09NFS: Remove nfs_begin_data_update/nfs_end_data_updateTrond Myklebust
The lower level routines in fs/nfs/proc.c, fs/nfs/nfs3proc.c and fs/nfs/nfs4proc.c should already be dealing with the revalidation issues. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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