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* nfsd: when reusing an existing repcache entry, unhash it firstJeff Layton2013-12-101-1/+8
| | | | | | | | | | | | | | | | | | | | | | | The DRC code will attempt to reuse an existing, expired cache entry in preference to allocating a new one. It'll then search the cache, and if it gets a hit it'll then free the cache entry that it was going to reuse. The cache code doesn't unhash the entry that it's going to reuse however, so it's possible for it end up designating an entry for reuse and then subsequently freeing the same entry after it finds it. This leads it to a later use-after-free situation and usually some list corruption warnings or an oops. Fix this by simply unhashing the entry that we intend to reuse. That will mean that it's not findable via a search and should prevent this situation from occurring. Cc: stable@vger.kernel.org # v3.10+ Reported-by: Christoph Hellwig <hch@infradead.org> Reported-by: g. artim <gartim@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd4: fix xdr decoding of large non-write compoundsJ. Bruce Fields2013-11-191-1/+2
| | | | | | | | | | | | | | | | | This fixes a regression from 247500820ebd02ad87525db5d9b199e5b66f6636 "nfsd4: fix decoding of compounds across page boundaries". The previous code was correct: argp->pagelist is initialized in nfs4svc_deocde_compoundargs to rqstp->rq_arg.pages, and is therefore a pointer to the page *after* the page we are currently decoding. The reason that patch nevertheless fixed a problem with decoding compounds containing write was a bug in the write decoding introduced by 5a80a54d21c96590d013378d8c5f65f879451ab4 "nfsd4: reorganize write decoding", after which write decoding no longer adhered to the rule that argp->pagelist point to the next page. Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: make sure to balance get/put_write_accessChristoph Hellwig2013-11-181-14/+15
| | | | | | | | | | | | | | Use a straight goto error label style in nfsd_setattr to make sure we always do the put_write_access call after we got it earlier. Note that the we have been failing to do that in the case nfsd_break_lease() returns an error, a bug introduced into 2.6.38 with 6a76bebefe15d9a08864f824d7f8d5beaf37c997 "nfsd4: break lease on nfsd setattr". Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: split up nfsd_setattrChristoph Hellwig2013-11-181-60/+84
| | | | | | | | | Split out two helpers to make the code more readable and easier to verify for correctness. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* Merge branch 'nfsd-next' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2013-11-165-77/+115
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull nfsd changes from Bruce Fields: "This includes miscellaneous bugfixes and cleanup and a performance fix for write-heavy NFSv4 workloads. (The most significant nfsd-relevant change this time is actually in the delegation patches that went through Viro, fixing a long-standing bug that can cause NFSv4 clients to miss updates made by non-nfs users of the filesystem. Those enable some followup nfsd patches which I have queued locally, but those can wait till 3.14)" * 'nfsd-next' of git://linux-nfs.org/~bfields/linux: (24 commits) nfsd: export proper maximum file size to the client nfsd4: improve write performance with better sendspace reservations svcrpc: remove an unnecessary assignment sunrpc: comment typo fix Revert "nfsd: remove_stid can be incorporated into nfs4_put_delegation" nfsd4: fix discarded security labels on setattr NFSD: Add support for NFS v4.2 operation checking nfsd4: nfsd_shutdown_net needs state lock NFSD: Combine decode operations for v4 and v4.1 nfsd: -EINVAL on invalid anonuid/gid instead of silent failure nfsd: return better errors to exportfs nfsd: fh_update should error out in unexpected cases nfsd4: need to destroy revoked delegations in destroy_client nfsd: no need to unhash_stid before free nfsd: remove_stid can be incorporated into nfs4_put_delegation nfsd: nfs4_open_delegation needs to remove_stid rather than unhash_stid nfsd: nfs4_free_stid nfsd: fix Kconfig syntax sunrpc: trim off EC bytes in GSSAPI v2 unwrap gss_krb5: document that we ignore sequence number ...
| * nfsd: export proper maximum file size to the clientChristoph Hellwig2013-11-141-1/+1
| | | | | | | | | | | | | | | | | | | | | | I noticed that we export a way to high value for the maxfilesize attribute when debugging a client issue. The issue didn't turn out to be related to it, but I think we should export it, so that clients can limit what write sizes they accept before hitting the server. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: improve write performance with better sendspace reservationsJ. Bruce Fields2013-11-131-0/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the rpc code conservatively refuses to accept rpc's from a client if the sum of its worst-case estimates of the replies it owes that client exceed the send buffer space. Unfortunately our estimate of the worst-case reply for an NFSv4 compound is always the maximum read size. This can unnecessarily limit the number of operations we handle concurrently, for example in the case most operations are writes (which have small replies). We can do a little better if we check which ops the compound contains. This is still a rough estimate, we'll need to improve on it some day. Reported-by: Shyam Kaushik <shyamnfs1@gmail.com> Tested-by: Shyam Kaushik <shyamnfs1@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * Revert "nfsd: remove_stid can be incorporated into nfs4_put_delegation"J. Bruce Fields2013-11-041-1/+3
| | | | | | | | | | | | | | | | | | This reverts commit 7ebe40f20372688a627ad6c754bc0d1c05df58a9. We forgot the nfs4_put_delegation call in fs/nfsd/nfs4callback.c which should not be unhashing the stateid. This lead to warnings from the idr code when we tried to removed id's twice. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: fix discarded security labels on setattrJ. Bruce Fields2013-11-011-0/+1
| | | | | | | | | | | | | | | | | | Security labels in setattr calls are currently ignored because we forget to set label->len. Cc: stable@vger.kernel.org Reported-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * NFSD: Add support for NFS v4.2 operation checkingAnna Schumaker2013-10-301-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | The server does allow NFS over v4.2, even if it doesn't add any new operations yet. I also switch to using constants to represent the last operation for each minor version since this makes the code cleaner and easier to understand at a quick glance. Signed-off-by: Anna Schumaker <bjschuma@netapp.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: nfsd_shutdown_net needs state lockJ. Bruce Fields2013-10-301-1/+2
| | | | | | | | | | | | | | | | | | A comment claims the caller should take it, but that's not being done. Note we don't want it around the cancel_delayed_work_sync since that may wait on work which holds the client lock. Reported-by: Benny Halevy <bhalevy@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * NFSD: Combine decode operations for v4 and v4.1Anna Schumaker2013-10-301-58/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | We were using a different array of function pointers to represent each minor version. This makes adding a new minor version tedious, since it needs a step to copy, paste and modify a new version of the same functions. This patch combines the v4 and v4.1 arrays into a single instance and will check minor version support inside each decoder function. Signed-off-by: Anna Schumaker <bjschuma@netapp.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: -EINVAL on invalid anonuid/gid instead of silent failureJ. Bruce Fields2013-10-291-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we're going to refuse to accept these it would be polite of us to at least say so.... This introduces a slight complication since we need to grandfather in exportfs's ill-advised use of -1 uid and gid on its test_export. If it turns out there are other users passing down -1 we may need to do something else. Best might be to drop the checks entirely, but I'm not sure if other parts of the kernel might assume that a task can't run as uid or gid -1. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: return better errors to exportfsJ. Bruce Fields2013-10-291-4/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | Someone noticed exportfs happily accepted exports that would later be rejected when mountd tried to give them to the kernel. Fix this. This is a regression from 4c1e1b34d5c800ad3ac9a7e2805b0bea70ad2278 "nfsd: Store ex_anon_uid and ex_anon_gid as kuids and kgids". Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: stable@vger.kernel.org Reported-by: Yin.JianHong <jiyin@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: fh_update should error out in unexpected casesJ. Bruce Fields2013-10-291-5/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The reporter saw a NULL dereference when a filesystem's ->mknod returned success but left the dentry negative, and then nfsd tried to dereference d_inode (in this case because the CREATE was followed by a GETATTR in the same nfsv4 compound). fh_update already checks for this and another broken case, but for some reason it returns success and leaves nfsd trying to soldier on. If it failed we'd avoid the crash. There's only so much we can do with a buggy filesystem, but it's easy enough to bail out here, so let's do that. Reported-by: Antti Tönkyrä <daedalus@pingtimeout.net> Tested-by: Antti Tönkyrä <daedalus@pingtimeout.net> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: need to destroy revoked delegations in destroy_clientBenny Halevy2013-10-291-0/+5
| | | | | | | | | | | | | | [use list_splice_init] Signed-off-by: Benny Halevy <bhalevy@primarydata.com> [bfields: no need for recall_lock here] Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: no need to unhash_stid before freeBenny Halevy2013-10-291-5/+2
| | | | | | | | | | | | | | | | idr_remove is about to be called before kmem_cache_free so unhashing it is redundant Signed-off-by: Benny Halevy <bhalevy@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: remove_stid can be incorporated into nfs4_put_delegationBenny Halevy2013-10-281-3/+1
| | | | | | | | | | | | | | All calls to nfs4_put_delegation are preceded with remove_stid. Signed-off-by: Benny Halevy <bhalevy@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: nfs4_open_delegation needs to remove_stid rather than unhash_stidBenny Halevy2013-10-281-1/+1
| | | | | | | | | | | | | | | | In the out_free: path, the newly allocated stid must be removed rather than unhashed so it can never be found. Signed-off-by: Benny Halevy <bhalevy@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: nfs4_free_stidBenny Halevy2013-10-281-2/+7
| | | | | | | | | | | | | | Make it symmetric to nfs4_alloc_stid. Signed-off-by: Benny Halevy <bhalevy@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: fix Kconfig syntaxChristoph Hellwig2013-10-261-1/+1
| | | | | | | | | | | | | | | | | | The description text for CONFIG_NFSD_V4_SECURITY_LABEL has an unpaired quote sign which breaks syntax highlighting for the nfsd Kconfig file. Remove it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd: switch to %p[dD]Al Viro2013-10-025-37/+31
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | locks: break delegations on any attribute modificationJ. Bruce Fields2013-11-091-2/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | NFSv4 uses leases to guarantee that clients can cache metadata as well as data. Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: David Howells <dhowells@redhat.com> Cc: Tyler Hicks <tyhicks@canonical.com> Cc: Dustin Kirkland <dustin.kirkland@gazzang.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | locks: break delegations on linkJ. Bruce Fields2013-11-091-1/+1
| | | | | | | | | | | | | | | | Cc: Tyler Hicks <tyhicks@canonical.com> Cc: Dustin Kirkland <dustin.kirkland@gazzang.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | locks: break delegations on renameJ. Bruce Fields2013-11-091-1/+1
| | | | | | | | | | | | | | Cc: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | locks: break delegations on unlinkJ. Bruce Fields2013-11-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to break delegations on any operation that changes the set of links pointing to an inode. Start with unlink. Such operations also hold the i_mutex on a parent directory. Breaking a delegation may require waiting for a timeout (by default 90 seconds) in the case of a unresponsive NFS client. To avoid blocking all directory operations, we therefore drop locks before waiting for the delegation. The logic then looks like: acquire locks ... test for delegation; if found: take reference on inode release locks wait for delegation break drop reference on inode retry It is possible this could never terminate. (Even if we take precautions to prevent another delegation being acquired on the same inode, we could get a different inode on each retry.) But this seems very unlikely. The initial test for a delegation happens after the lock on the target inode is acquired, but the directory inode may have been acquired further up the call stack. We therefore add a "struct inode **" argument to any intervening functions, which we use to pass the inode back up to the caller in the case it needs a delegation synchronously broken. Cc: David Howells <dhowells@redhat.com> Cc: Tyler Hicks <tyhicks@canonical.com> Cc: Dustin Kirkland <dustin.kirkland@gazzang.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | locks: introduce new FL_DELEG lock flagJ. Bruce Fields2013-11-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | For now FL_DELEG is just a synonym for FL_LEASE. So this patch doesn't change behavior. Next we'll modify break_lease to treat FL_DELEG leases differently, to account for the fact that NFSv4 delegations should be broken in more situations than Windows oplocks. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | nfsd: switch to %p[dD]Al Viro2013-10-245-37/+31
|/ | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'for-linus' of ↵Linus Torvalds2013-09-121-9/+23
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs pile 4 from Al Viro: "list_lru pile, mostly" This came out of Andrew's pile, Al ended up doing the merge work so that Andrew didn't have to. Additionally, a few fixes. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (42 commits) super: fix for destroy lrus list_lru: dynamically adjust node arrays shrinker: Kill old ->shrink API. shrinker: convert remaining shrinkers to count/scan API staging/lustre/libcfs: cleanup linux-mem.h staging/lustre/ptlrpc: convert to new shrinker API staging/lustre/obdclass: convert lu_object shrinker to count/scan API staging/lustre/ldlm: convert to shrinkers to count/scan API hugepage: convert huge zero page shrinker to new shrinker API i915: bail out earlier when shrinker cannot acquire mutex drivers: convert shrinkers to new count/scan API fs: convert fs shrinkers to new scan/count API xfs: fix dquot isolation hang xfs-convert-dquot-cache-lru-to-list_lru-fix xfs: convert dquot cache lru to list_lru xfs: rework buffer dispose list tracking xfs-convert-buftarg-lru-to-generic-code-fix xfs: convert buftarg LRU to generic code fs: convert inode and dentry shrinking to be node aware vmscan: per-node deferred work ...
| * fs: convert fs shrinkers to new scan/count APIDave Chinner2013-09-101-9/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Convert the filesystem shrinkers to use the new API, and standardise some of the behaviours of the shrinkers at the same time. For example, nr_to_scan means the number of objects to scan, not the number of objects to free. I refactored the CIFS idmap shrinker a little - it really needs to be broken up into a shrinker per tree and keep an item count with the tree root so that we don't need to walk the tree every time the shrinker needs to count the number of objects in the tree (i.e. all the time under memory pressure). [glommer@openvz.org: fixes for ext4, ubifs, nfs, cifs and glock. Fixes are needed mainly due to new code merged in the tree] [assorted fixes folded in] Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Glauber Costa <glommer@openvz.org> Acked-by: Mel Gorman <mgorman@suse.de> Acked-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Acked-by: Jan Kara <jack@suse.cz> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Cc: Arve Hjønnevåg <arve@android.com> Cc: Carlos Maiolino <cmaiolino@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Rientjes <rientjes@google.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: J. Bruce Fields <bfields@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Stultz <john.stultz@linaro.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Kent Overstreet <koverstreet@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Thomas Hellstrom <thellstrom@vmware.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'nfsd-next' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2013-09-102-14/+21
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull nfsd updates from Bruce Fields: "This was a very quiet cycle! Just a few bugfixes and some cleanup" * 'nfsd-next' of git://linux-nfs.org/~bfields/linux: rpc: let xdr layer allocate gssproxy receieve pages rpc: fix huge kmalloc's in gss-proxy rpc: comment on linux_cred encoding, treat all as unsigned rpc: clean up decoding of gssproxy linux creds svcrpc: remove unused rq_resused nfsd4: nfsd4_create_clid_dir prints uninitialized data nfsd4: fix leak of inode reference on delegation failure Revert "nfsd: nfs4_file_get_access: need to be more careful with O_RDWR" sunrpc: prepare NFS for 2038 nfsd4: fix setlease error return nfsd: nfs4_file_get_access: need to be more careful with O_RDWR
| * nfsd4: nfsd4_create_clid_dir prints uninitialized dataJ. Bruce Fields2013-08-301-2/+0
| | | | | | | | | | | | Take the easy way out and just remove the printk. Reported-by: David Howells <dhowells@redhat.com>
| * nfsd4: fix leak of inode reference on delegation failureJ. Bruce Fields2013-08-301-11/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes a regression from 68a3396178e6688ad7367202cdf0af8ed03c8727 "nfsd4: shut down more of delegation earlier". After that commit, nfs4_set_delegation() failures result in nfs4_put_delegation being called, but nfs4_put_delegation doesn't free the nfs4_file that has already been set by alloc_init_deleg(). This can result in an oops on later unmounting the exported filesystem. Note also delaying the fi_had_conflict check we're able to return a better error (hence give 4.1 clients a better idea why the delegation failed; though note CONFLICT isn't an exact match here, as that's supposed to indicate a current conflict, but all we know here is that there was one recently). Reported-by: Toralf Förster <toralf.foerster@gmx.de> Tested-by: Toralf Förster <toralf.foerster@gmx.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * Revert "nfsd: nfs4_file_get_access: need to be more careful with O_RDWR"J. Bruce Fields2013-08-301-4/+9
| | | | | | | | | | | | | | | | | | | | This reverts commit df66e75395c839c3a373bae897dbb1248f741b45. nfsd4_lock can get a read-only or write-only reference when only a read-write open is available. This is normal. Cc: Harshula Jayasuriya <harshula@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * Merge tag 'v3.11-rc5' into for-3.12 branchJ. Bruce Fields2013-08-303-4/+5
| |\ | | | | | | | | | | | | | | | For testing purposes I want some nfs and nfsd bugfixes (specifically, 58cd57bfd9db3bc213bf9d6a10920f82095f0114 and previous nfsd patches, and Trond's 4f3cc4809a98a165a9708b72b47de71643797bbd).
| * | nfsd4: fix setlease error returnJ. Bruce Fields2013-07-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This actually makes a difference in the 4.1 case, since we use the status to decide what reason to give the client for the delegation refusal (see nfsd4_open_deleg_none_ext), and in theory a client might choose suboptimal behavior if we give the wrong answer. Reported-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * | nfsd: nfs4_file_get_access: need to be more careful with O_RDWRHarshula Jayasuriya2013-07-231-9/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | If fi_fds = {non-NULL, NULL, non-NULL} and oflag = O_WRONLY the WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR])) doesn't trigger when it should. Signed-off-by: Harshula Jayasuriya <harshula@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* | | nfsd: racy access to ->d_name in nsfd4_encode_path()Al Viro2013-09-031-6/+8
| |/ |/| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | nfsd: Fix SP4_MACH_CRED negotiation in EXCHANGE_IDWeston Andros Adamson2013-08-072-4/+3
| | | | | | | | | | | | | | | | - don't BUG_ON() when not SP4_NONE - calculate recv and send reserve sizes correctly Signed-off-by: Weston Andros Adamson <dros@netapp.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* | nfsd4: Fix MACH_CRED NULL dereferenceJ. Bruce Fields2013-08-071-0/+2
|/ | | | | | | Fixes a NULL-dereference on attempts to use MACH_CRED protection over auth_sys. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* nfsd: nfsd_open: when dentry_open returns an error do not propagate as ↵Harshula Jayasuriya2013-07-231-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | struct file The following call chain: ------------------------------------------------------------ nfs4_get_vfs_file - nfsd_open - dentry_open - do_dentry_open - __get_file_write_access - get_write_access - return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; ------------------------------------------------------------ can result in the following state: ------------------------------------------------------------ struct nfs4_file { ... fi_fds = {0xffff880c1fa65c80, 0xffffffffffffffe6, 0x0}, fi_access = {{ counter = 0x1 }, { counter = 0x0 }}, ... ------------------------------------------------------------ 1) First time around, in nfs4_get_vfs_file() fp->fi_fds[O_WRONLY] is NULL, hence nfsd_open() is called where we get status set to an error and fp->fi_fds[O_WRONLY] to -ETXTBSY. Thus we do not reach nfs4_file_get_access() and fi_access[O_WRONLY] is not incremented. 2) Second time around, in nfs4_get_vfs_file() fp->fi_fds[O_WRONLY] is NOT NULL (-ETXTBSY), so nfsd_open() is NOT called, but nfs4_file_get_access() IS called and fi_access[O_WRONLY] is incremented. Thus we leave a landmine in the form of the nfs4_file data structure in an incorrect state. 3) Eventually, when __nfs4_file_put_access() is called it finds fi_access[O_WRONLY] being non-zero, it decrements it and calls nfs4_file_put_fd() which tries to fput -ETXTBSY. ------------------------------------------------------------ ... [exception RIP: fput+0x9] RIP: ffffffff81177fa9 RSP: ffff88062e365c90 RFLAGS: 00010282 RAX: ffff880c2b3d99cc RBX: ffff880c2b3d9978 RCX: 0000000000000002 RDX: dead000000100101 RSI: 0000000000000001 RDI: ffffffffffffffe6 RBP: ffff88062e365c90 R8: ffff88041fe797d8 R9: ffff88062e365d58 R10: 0000000000000008 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000007 R14: 0000000000000000 R15: 0000000000000000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffff88062e365c98] __nfs4_file_put_access at ffffffffa0562334 [nfsd] #10 [ffff88062e365cc8] nfs4_file_put_access at ffffffffa05623ab [nfsd] #11 [ffff88062e365ce8] free_generic_stateid at ffffffffa056634d [nfsd] #12 [ffff88062e365d18] release_open_stateid at ffffffffa0566e4b [nfsd] #13 [ffff88062e365d38] nfsd4_close at ffffffffa0567401 [nfsd] #14 [ffff88062e365d88] nfsd4_proc_compound at ffffffffa0557f28 [nfsd] #15 [ffff88062e365dd8] nfsd_dispatch at ffffffffa054543e [nfsd] #16 [ffff88062e365e18] svc_process_common at ffffffffa04ba5a4 [sunrpc] #17 [ffff88062e365e98] svc_process at ffffffffa04babe0 [sunrpc] #18 [ffff88062e365eb8] nfsd at ffffffffa0545b62 [nfsd] #19 [ffff88062e365ee8] kthread at ffffffff81090886 #20 [ffff88062e365f48] kernel_thread at ffffffff8100c14a ------------------------------------------------------------ Cc: stable@vger.kernel.org Signed-off-by: Harshula Jayasuriya <harshula@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2013-07-173-8/+8
|\ | | | | | | | | | | | | | | | | | | Pull nfsd bugfixes from Bruce Fields: "Just three minor bugfixes" * 'for-3.11' of git://linux-nfs.org/~bfields/linux: svcrdma: underflow issue in decode_write_list() nfsd4: fix minorversion support interface lockd: protect nlm_blocked access in nlmsvc_retry_blocked
| * nfsd4: fix minorversion support interfaceJ. Bruce Fields2013-07-123-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | You can turn on or off support for minorversions using e.g. echo "-4.2" >/proc/fs/nfsd/versions However, the current implementation is a little wonky. For example, the above will turn off 4.2 support, but it will also turn *on* 4.1 support. This didn't matter as long as we only had 2 minorversions, which was true till very recently. And do a little cleanup here. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
* | Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2013-07-1110-103/+413
|\ \ | |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull nfsd changes from Bruce Fields: "Changes this time include: - 4.1 enabled on the server by default: the last 4.1-specific issues I know of are fixed, so we're not going to find the rest of the bugs without more exposure. - Experimental support for NFSv4.2 MAC Labeling (to allow running selinux over NFS), from Dave Quigley. - Fixes for some delicate cache/upcall races that could cause rare server hangs; thanks to Neil Brown and Bodo Stroesser for extreme debugging persistence. - Fixes for some bugs found at the recent NFS bakeathon, mostly v4 and v4.1-specific, but also a generic bug handling fragmented rpc calls" * 'for-3.11' of git://linux-nfs.org/~bfields/linux: (31 commits) nfsd4: support minorversion 1 by default nfsd4: allow destroy_session over destroyed session svcrpc: fix failures to handle -1 uid's sunrpc: Don't schedule an upcall on a replaced cache entry. net/sunrpc: xpt_auth_cache should be ignored when expired. sunrpc/cache: ensure items removed from cache do not have pending upcalls. sunrpc/cache: use cache_fresh_unlocked consistently and correctly. sunrpc/cache: remove races with queuing an upcall. nfsd4: return delegation immediately if lease fails nfsd4: do not throw away 4.1 lock state on last unlock nfsd4: delegation-based open reclaims should bypass permissions svcrpc: don't error out on small tcp fragment svcrpc: fix handling of too-short rpc's nfsd4: minor read_buf cleanup nfsd4: fix decoding of compounds across page boundaries nfsd4: clean up nfs4_open_delegation NFSD: Don't give out read delegations on creates nfsd4: allow client to send no cb_sec flavors nfsd4: fail attempts to request gss on the backchannel nfsd4: implement minimal SP4_MACH_CRED ...
| * nfsd4: support minorversion 1 by defaultJ. Bruce Fields2013-07-081-1/+1
| | | | | | | | | | | | | | | | We now have minimal minorversion 1 support; turn it on by default. This can still be turned off with "echo -4.1 >/proc/fs/nfsd/versions". Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: allow destroy_session over destroyed sessionJ. Bruce Fields2013-07-082-10/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | RFC 5661 allows a client to destroy a session using a compound associated with the destroyed session, as long as the DESTROY_SESSION op is the last op of the compound. We attempt to allow this, but testing against a Solaris client (which does destroy sessions in this way) showed that we were failing the DESTROY_SESSION with NFS4ERR_DELAY, because we assumed the reference count on the session (held by us) represented another rpc in progress over this session. Fix this by noting that in this case the expected reference count is 1, not 0. Also, note as long as the session holds a reference to the compound we're destroying, we can't free it here--instead, delay the free till the final put in nfs4svc_encode_compoundres. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: return delegation immediately if lease failsJ. Bruce Fields2013-07-011-1/+3
| | | | | | | | | | | | | | | | | | | | | | This case shouldn't happen--the administrator shouldn't really allow other applications access to the export until clients have had the chance to reclaim their state--but if it does then we should set the "return this lease immediately" bit on the reply. That still leaves some small races, but it's the best the protocol allows us to do in the case a lease is ripped out from under us.... Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: do not throw away 4.1 lock state on last unlockJ. Bruce Fields2013-07-011-8/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit eb2099f31b0f090684a64ef8df44a30ff7c45fc2 "nfsd4: release lockowners on last unlock in 4.1 case". Trond identified language in rfc 5661 section 8.2.4 which forbids this behavior: Stateids associated with byte-range locks are an exception. They remain valid even if a LOCKU frees all remaining locks, so long as the open file with which they are associated remains open, unless the client frees the stateids via the FREE_STATEID operation. And bakeathon 2013 testing found a 4.1 freebsd client was getting an incorrect BAD_STATEID return from a FREE_STATEID in the above situation and then failing. The spec language honestly was probably a mistake but at this point with implementations already following it we're probably stuck with that. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: delegation-based open reclaims should bypass permissionsJ. Bruce Fields2013-07-011-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We saw a v4.0 client's create fail as follows: - open create succeeds and gets a read delegation - client attempts to set mode on new file, gets DELAY while server recalls delegation. - client attempts a CLAIM_DELEGATE_CUR open using the delegation, gets error because of new file mode. This probably can't happen on a recent kernel since we're no longer giving out delegations on create opens. Nevertheless, it's a bug--reclaim opens should bypass permission checks. Reported-by: Steve Dickson <steved@redhat.com> Reported-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| * nfsd4: minor read_buf cleanupJ. Bruce Fields2013-07-011-10/+14
| | | | | | | | | | | | The code to step to the next page seems reasonably self-contained. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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