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2010-07-19mm: add context argument to shrinker callbackDave Chinner
The current shrinker implementation requires the registered callback to have global state to work from. This makes it difficult to shrink caches that are not global (e.g. per-filesystem caches). Pass the shrinker structure to the callback so that users can embed the shrinker structure in the context the shrinker needs to operate on and get back to it in the callback via container_of(). Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2010-06-22NFSv4: Fix an embarassing typo in encode_attrs()Trond Myklebust
Apparently, we have never been able to set the atime correctly from the NFSv4 client. Reported-by: 小倉一夫 <ka-ogura@bd6.so-net.ne.jp> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org
2010-06-22NFSv4: Ensure that /proc/self/mountinfo displays the minor version numberTrond Myklebust
Currently, we do not display the minor version mount parameter in the /proc mount info. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org
2010-06-22NFSv4.1: Ensure that we initialise the session when following a referralTrond Myklebust
Put the code that is common to both the referral and ordinary mount cases into a common helper routine. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-06-22nfs4 use mandatory attribute file type in nfs4_get_rootAndy Adamson
S_ISDIR(fsinfo.fattr->mode) checks the file type rather than the mode bits, so we should be checking for the NFS_ATTR_FATTR_TYPE fattr property. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org
2010-05-27drop unused dentry argument to ->fsyncChristoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-26NFS: Fix another nfs_wb_page() deadlockTrond Myklebust
J.R. Okajima reports that the call to sync_inode() in nfs_wb_page() can deadlock with other writeback flush calls. It boils down to the fact that we cannot ever call writeback_single_inode() while holding a page lock (even if we do set nr_to_write to zero) since another process may already be waiting in the call to do_writepages(), and so will deny us the I_SYNC lock. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-26NFS: Ensure that we mark the inode as dirty if we exit early from commitTrond Myklebust
If we exit from nfs_commit_inode() without ensuring that the COMMIT rpc call has been completed, we must re-mark the inode as dirty. Otherwise, future calls to sync_inode() with the WB_SYNC_ALL flag set will fail to ensure that the data is on the disk. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-26NFS: Fix a lock imbalance typo in nfs_access_cache_shrinkerTrond Myklebust
Commit 9c7e7e23371e629dbb3b341610a418cdf1c19d91 (NFS: Don't call iput() in nfs_access_cache_shrinker) unintentionally removed the spin unlock for the inode->i_lock. Reported-by: David Howells <dhowells@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-25kernel-wide: replace USHORT_MAX, SHORT_MAX and SHORT_MIN with USHRT_MAX, ↵Alexey Dobriyan
SHRT_MAX and SHRT_MIN - C99 knows about USHRT_MAX/SHRT_MAX/SHRT_MIN, not USHORT_MAX/SHORT_MAX/SHORT_MIN. - Make SHRT_MIN of type s16, not int, for consistency. [akpm@linux-foundation.org: fix drivers/dma/timb_dma.c] [akpm@linux-foundation.org: fix security/keys/keyring.c] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-14NFS: Don't call iput() in nfs_access_cache_shrinkerTrond Myklebust
iput() can potentially attempt to allocate memory, so we should avoid calling it in a memory shrinker. Instead, rely on the fact that iput() will call nfs_access_zap_cache(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Clean up nfs_access_zap_cache()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Don't run nfs_access_cache_shrinker() when the mask is GFP_NOFSTrond Myklebust
Both iput() and put_rpccred() might allocate memory under certain circumstances, so make sure that we don't recurse and deadlock... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Read requests can use GFP_KERNEL.Trond Myklebust
There is no danger of deadlock should the allocation trigger page writeback. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Clean up nfs_create_request()Trond Myklebust
There is no point in looping if we're out of memory. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Don't use GFP_KERNEL allocations in state recoveryTrond Myklebust
We do not want to have the state recovery thread kick off and wait for a memory reclaim, since that may deadlock when the writebacks end up waiting for the state recovery thread to complete. The safe thing is therefore to use GFP_NOFS in all open, close, delegation return, lock, etc. operations that may be called by the state recovery thread. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Calldata for nfs4_renew_done()Chuck Lever
I'm about to change task->tk_start from a jiffies value to a ktime_t value in order to make RPC RTT reporting more precise. Recently (commit dc96aef9) nfs4_renew_done() started to reference task->tk_start so that a jiffies value no longer had to be passed from nfs4_proc_async_renew(). This allowed the calldata to point to an nfs_client instead. Changing task->tk_start to a ktime_t value makes it effectively useless for renew timestamps, so we need to restore the pre-dc96aef9 logic that provided a jiffies "start" timestamp to nfs4_renew_done(). Both an nfs_client pointer and a timestamp need to be passed to nfs4_renew_done(), so create a new nfs_renewdata structure that contains both, resembling what is already done for delegreturn, lock, and unlock. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Squelch compiler warning in nfs_add_server_stats()Chuck Lever
Clean up: fs/nfs/iostat.h: In function ‘nfs_add_server_stats’: fs/nfs/iostat.h:41: warning: comparison between signed and unsigned integer expressions fs/nfs/iostat.h:41: warning: comparison between signed and unsigned integer expressions fs/nfs/iostat.h:41: warning: comparison between signed and unsigned integer expressions fs/nfs/iostat.h:41: warning: comparison between signed and unsigned integer expressions Commit fce22848 replaced the open-coded per-cpu logic in several functions in fs/nfs/iostat.h with a single invocation of this_cpu_ptr(). This macro assumes its second argument is signed, not unsigned. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Clean up fscache_uniq mount optionChuck Lever
Clean up: fscache_uniq takes a string, so it should be included with the other string mount option definitions, by convention. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Squelch compiler warningChuck Lever
Seen with -Wextra: /home/cel/linux/fs/nfs/fscache.c: In function ‘__nfs_readpages_from_fscache’: /home/cel/linux/fs/nfs/fscache.c:479: warning: comparison between signed and unsigned integer expressions The comparison implicitly converts "int" to "unsigned", making it safe. But there's no need for the implicit type conversions here, and the dfprintk() already uses a "%u" formatter for "npages." Better to reduce confusion. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Clean up the NFSv4 setclientid operationTrond Myklebust
Reviewed-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Allow attribute caching with 'noac' mounts if client holds a delegationTrond Myklebust
If the server has given us a delegation on a file, we _know_ that we can cache the attribute information even when the user has specified 'noac'. Reviewed-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Fix up the documentation for nfs_do_refmountTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Replace nfsroot on-stack filehandleTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Cleanup file handle allocations in fs/nfs/super.cTrond Myklebust
Use the new helper functions instead of open coding. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Prevent the mount code from looping forever on broken exportsTrond Myklebust
Keep a global count of how many referrals that the current task has traversed on a path lookup. Return ELOOP if the count exceeds MAX_NESTED_LINKS. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs3_proc_getacl() and nfs3_proc_setacl()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs_statfs()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs_setattr()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs4_proc_create()Trond Myklebust
Move the O_EXCL open handling into _nfs4_do_open() where it belongs. Doing so also allows us to reuse the struct fattr from the opendata. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_proc_symlink()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_proc_createTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_rmdirTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs_proc_remove()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs3_proc_readlink()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_link()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs_readdir()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs3_proc_rename() and nfs4_proc_rename()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce stack footprint of nfs_revalidate_inode()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Reduce stack footprint of nfs4_proc_access() and nfs3_proc_access()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Reduce the stack footprint of nfs4_remote_referral_get_sbTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Reduce stack footprint of nfs4_get_root()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_follow_remote_path()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_lookupTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Reduce the stack footprint of try_location()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_create_serverTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Reduce the stack footprint of nfs_follow_mountpoint()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Eliminate nfs4_path_walk()Trond Myklebust
All we really want is the ability to retrieve the root file handle. We no longer need the ability to walk down the path, since that is now done in nfs_follow_remote_path(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFS: Add helper functions for allocating filehandles and fattr structsTrond Myklebust
NFS Filehandles and struct fattr are really too large to be allocated on the stack. This patch adds in a couple of helper functions to allocate them dynamically instead. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-01NFS: Fix RCU issues in the NFSv4 delegation codeDavid Howells
Fix a number of RCU issues in the NFSv4 delegation code. (1) delegation->cred doesn't need to be RCU protected as it's essentially an invariant refcounted structure. By the time we get to nfs_free_delegation(), the delegation is being released, so no one else should be attempting to use the saved credentials, and they can be cleared. However, since the list of delegations could still be under traversal at this point by such as nfs_client_return_marked_delegations(), the cred should be released in nfs_do_free_delegation() rather than in nfs_free_delegation(). Simply using rcu_assign_pointer() to clear it is insufficient as that doesn't stop the cred from being destroyed, and nor does calling put_rpccred() after call_rcu(), given that the latter is asynchronous. (2) nfs_detach_delegation_locked() and nfs_inode_set_delegation() should use rcu_derefence_protected() because they can only be called if nfs_client::cl_lock is held, and that guards against anyone changing nfsi->delegation under it. Furthermore, the barrier imposed by rcu_dereference() is superfluous, given that the spin_lock() is also a barrier. (3) nfs_detach_delegation_locked() is now passed a pointer to the nfs_client struct so that it can issue lockdep advice based on clp->cl_lock for (2). (4) nfs_inode_return_delegation_noreclaim() and nfs_inode_return_delegation() should use rcu_access_pointer() outside the spinlocked region as they merely examine the pointer and don't follow it, thus rendering unnecessary the need to impose a partial ordering over the one item of interest. These result in an RCU warning like the following: [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- fs/nfs/delegation.c:332 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 2 locks held by mount.nfs4/2281: #0: (&type->s_umount_key#34){+.+...}, at: [<ffffffff810b25b4>] deactivate_super+0x60/0x80 #1: (iprune_sem){+.+...}, at: [<ffffffff810c332a>] invalidate_inodes+0x39/0x13a stack backtrace: Pid: 2281, comm: mount.nfs4 Not tainted 2.6.34-rc1-cachefs #110 Call Trace: [<ffffffff8105149f>] lockdep_rcu_dereference+0xaa/0xb2 [<ffffffffa00b4591>] nfs_inode_return_delegation_noreclaim+0x5b/0xa0 [nfs] [<ffffffffa0095d63>] nfs4_clear_inode+0x11/0x1e [nfs] [<ffffffff810c2d92>] clear_inode+0x9e/0xf8 [<ffffffff810c3028>] dispose_list+0x67/0x10e [<ffffffff810c340d>] invalidate_inodes+0x11c/0x13a [<ffffffff810b1dc1>] generic_shutdown_super+0x42/0xf4 [<ffffffff810b1ebe>] kill_anon_super+0x11/0x4f [<ffffffffa009893c>] nfs4_kill_super+0x3f/0x72 [nfs] [<ffffffff810b25bc>] deactivate_super+0x68/0x80 [<ffffffff810c6744>] mntput_no_expire+0xbb/0xf8 [<ffffffff810c681b>] release_mounts+0x9a/0xb0 [<ffffffff810c689b>] put_mnt_ns+0x6a/0x79 [<ffffffffa00983a1>] nfs_follow_remote_path+0x5a/0x146 [nfs] [<ffffffffa0098334>] ? nfs_do_root_mount+0x82/0x95 [nfs] [<ffffffffa00985a9>] nfs4_try_mount+0x75/0xaf [nfs] [<ffffffffa0098874>] nfs4_get_sb+0x291/0x31a [nfs] [<ffffffff810b2059>] vfs_kern_mount+0xb8/0x177 [<ffffffff810b2176>] do_kern_mount+0x48/0xe8 [<ffffffff810c810b>] do_mount+0x782/0x7f9 [<ffffffff810c8205>] sys_mount+0x83/0xbe [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b Also on: fs/nfs/delegation.c:215 invoked rcu_dereference_check() without protection! [<ffffffff8105149f>] lockdep_rcu_dereference+0xaa/0xb2 [<ffffffffa00b4223>] nfs_inode_set_delegation+0xfe/0x219 [nfs] [<ffffffffa00a9c6f>] nfs4_opendata_to_nfs4_state+0x2c2/0x30d [nfs] [<ffffffffa00aa15d>] nfs4_do_open+0x2a6/0x3a6 [nfs] ... And: fs/nfs/delegation.c:40 invoked rcu_dereference_check() without protection! [<ffffffff8105149f>] lockdep_rcu_dereference+0xaa/0xb2 [<ffffffffa00b3bef>] nfs_free_delegation+0x3d/0x6e [nfs] [<ffffffffa00b3e71>] nfs_do_return_delegation+0x26/0x30 [nfs] [<ffffffffa00b406a>] __nfs_inode_return_delegation+0x1ef/0x1fe [nfs] [<ffffffffa00b448a>] nfs_client_return_marked_delegations+0xc9/0x124 [nfs] ... Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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