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2009-06-22Merge branch 'for-2.6.31' of git://fieldses.org/git/linux-nfsdLinus Torvalds
* 'for-2.6.31' of git://fieldses.org/git/linux-nfsd: (60 commits) SUNRPC: Fix the TCP server's send buffer accounting nfsd41: Backchannel: minorversion support for the back channel nfsd41: Backchannel: cleanup nfs4.0 callback encode routines nfsd41: Remove ip address collision detection case nfsd: optimise the starting of zero threads when none are running. nfsd: don't take nfsd_mutex twice when setting number of threads. nfsd41: sanity check client drc maxreqs nfsd41: move channel attributes from nfsd4_session to a nfsd4_channel_attr struct NFS: kill off complicated macro 'PROC' sunrpc: potential memory leak in function rdma_read_xdr nfsd: minor nfsd_vfs_write cleanup nfsd: Pull write-gathering code out of nfsd_vfs_write nfsd: track last inode only in use_wgather case sunrpc: align cache_clean work's timer nfsd: Use write gathering only with NFSv2 NFSv4: kill off complicated macro 'PROC' NFSv4: do exact check about attribute specified knfsd: remove unreported filehandle stats counters knfsd: fix reply cache memory corruption knfsd: reply cache cleanups ...
2009-06-18nfsd41: Backchannel: minorversion support for the back channelAndy Adamson
Prepare to share backchannel code with NFSv4.1. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com> [nfsd41: use nfsd4_cb_sequence for callback minorversion] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-18nfsd41: Backchannel: cleanup nfs4.0 callback encode routinesAndy Adamson
Mimic the client and prepare to share the back channel xdr with NFSv4.1. Bump the number of operations in each encode routine, then backfill the number of operations. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-18nfsd41: Remove ip address collision detection caseMike Sager
Verified that cthon and pynfs exchange id tests pass (except for the two expected fails: EID8 and EID50) Signed-off-by: Mike Sager <sager@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-18nfsd: optimise the starting of zero threads when none are running.NeilBrown
Currently, if we ask to set then number of nfsd threads to zero when there are none running, we set up all the sockets and register the service, and then tear it all down again. This is pointless. So detect that case and exit promptly. (also remove an assignment to 'error' which was never used. Signed-off-by: NeilBrown <neilb@suse.de> Acked-by: Jeff Layton <jlayton@redhat.com>
2009-06-18nfsd: don't take nfsd_mutex twice when setting number of threads.NeilBrown
Currently when we write a number to 'threads' in nfsdfs, we take the nfsd_mutex, update the number of threads, then take the mutex again to read the number of threads. Mostly this isn't a big deal. However if we are write '0', and portmap happens to be dead, then we can get unpredictable behaviour. If the nfsd threads all got killed quickly and the last thread is waiting for portmap to respond, then the second time we take the mutex we will block waiting for the last thread. However if the nfsd threads didn't die quite that fast, then there will be no contention when we try to take the mutex again. Unpredictability isn't fun, and waiting for the last thread to exit is pointless, so avoid taking the lock twice. To achieve this, get nfsd_svc return a non-negative number of active threads when not returning a negative error. Signed-off-by: NeilBrown <neilb@suse.de>
2009-06-16nfsd41: sanity check client drc maxreqsAndy Adamson
Ensure the client requested maximum requests are between 1 and NFSD_MAX_SLOTS_PER_SESSION Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-16nfsd41: move channel attributes from nfsd4_session to a nfsd4_channel_attr ↵Alexandros Batsakis
struct the change is valid for both the forechannel and the backchannel (currently dummy) Signed-off-by: Alexandros Batsakis <Alexandros.Batsakis@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-15NFS: kill off complicated macro 'PROC'Yu Zhiguo
kill off obscure macro 'PROC' of NFSv2&3 in order to make the code more clear. Among other things, this makes it simpler to grep for callers of these functions--something which has frequently caused confusion among nfs developers. Signed-off-by: Yu Zhiguo <yuzg@cn.fujitsu.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-15nfsd: minor nfsd_vfs_write cleanupJ. Bruce Fields
There's no need to check host_err >= 0 every time here when we could check host_err < 0 once, following the usual kernel style. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-15nfsd: Pull write-gathering code out of nfsd_vfs_writeJ. Bruce Fields
This is a relatively self-contained piece of code that handles a special case--move it to its own function. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-15nfsd: track last inode only in use_wgather caseJ. Bruce Fields
Updating last_ino and last_dev probably isn't useful in the !use_wgather case. Also remove some pointless ifdef'd-out code. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-15nfsd: Use write gathering only with NFSv2Trond Myklebust
NFSv3 and above can use unstable writes whenever they are sending more than one write, rather than relying on the flaky write gathering heuristics. More often than not, write gathering is currently getting it wrong when the NFSv3 clients are sending a single write with FILE_SYNC for efficiency reasons. This patch turns off write gathering for NFSv3/v4, and ensures that it only applies to the one case that can actually benefit: namely NFSv2. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-15Merge commit 'v2.6.30' into for-2.6.31J. Bruce Fields
2009-06-11switch follow_down()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-11switch follow_up() to struct pathAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-11switch rqst_exp_parent()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-11switch rqst_exp_get_by_name()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-11switch exp_parent() to struct pathAl Viro
... and lose the always-NULL last argument (non-NULL case had been split off a while ago). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-11nfsd struct path use: exp_get_by_name()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-09Merge branch 'master' into nextJames Morris
2009-06-01NFSv4: kill off complicated macro 'PROC'Yu Zhiguo
J. Bruce Fields wrote: ... > (This is extremely confusing code to track down: note that > proc->pc_decode is set to nfs4svc_decode_compoundargs() by the PROC() > macro at the end of fs/nfsd/nfs4proc.c. Which means, for example, that > grepping for nfs4svc_decode_compoundargs() gets you nowhere. Patches to > kill off that macro would be welcomed....) the macro 'PROC' is complicated and obscure, it had better be killed off in order to make the code more clear. Signed-off-by: Yu Zhiguo <yuzg@cn.fujitsu.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-06-01NFSv4: do exact check about attribute specifiedYu Zhiguo
Server should return NFS4ERR_ATTRNOTSUPP if an attribute specified is not supported in current environment. Operations CREATE, NVERIFY, OPEN, SETATTR and VERIFY should do this check. This bug is found when do newpynfs tests. The names of the tests that failed are following: CR12 NVF7a NVF7b NVF7c NVF7d NVF7f NVF7r NVF7s OPEN15 VF7a VF7b VF7c VF7d VF7f VF7r VF7s Add function do_check_fattr() to do exact check: 1, Check attribute specified is supported by the NFSv4 server or not. 2, Check FATTR4_WORD0_ACL & FATTR4_WORD0_FS_LOCATIONS are supported in current environment or not. 3, Check attribute specified is writable or not. step 1 and 3 are done in function nfsd4_decode_fattr() but removed to this function now. Signed-off-by: Yu Zhiguo <yuzg@cn.fujitsu.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-28integrity: nfsd imbalance bug fixMimi Zohar
An nfsd exported file is opened/closed by the kernel causing the integrity imbalance message. Before a file is opened, there normally is permission checking, which is done in inode_permission(). However, as integrity checking requires a dentry and mount point, which is not available in inode_permission(), the integrity (permission) checking must be called separately. In order to detect any missing integrity checking calls, we keep track of file open/closes. ima_path_check() increments these counts and does the integrity (permission) checking. As a result, the number of calls to ima_path_check()/ima_file_free() should be balanced. An extra call to fput(), indicates the file could have been accessed without first calling ima_path_check(). In nfsv3 permission checking is done once, followed by multiple reads, which do an open/close for each read. The integrity (permission) checking call should be in nfsd_permission() after the inode_permission() call, but as there is no correlation between the number of permission checking and open calls, the integrity checking call should not increment the counters, but defer it to when the file is actually opened. This patch adds: - integrity (permission) checking for nfsd exported files in nfsd_permission(). - a call to increment counts for files opened by nfsd. This patch has been updated to return the nfs error types. Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
2009-05-27nfsd: fix hung up of nfs client while sync write data to nfs serverWei Yongjun
Commit 'Short write in nfsd becomes a full write to the client' (31dec2538e45e9fff2007ea1f4c6bae9f78db724) broken the sync write. With the following commands to reproduce: $ mount -t nfs -o sync 192.168.0.21:/nfsroot /mnt $ cd /mnt $ echo aaaa > temp.txt Then nfs client is hung up. In SYNC mode the server alaways return the write count 0 to the client. This is because the value of host_err in nfsd_vfs_write() will be overwrite in SYNC mode by 'host_err=nfsd_sync(file);', and then we return host_err(which is now 0) as write count. This patch fixed the problem. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-27knfsd: remove unreported filehandle stats countersGreg Banks
The file nfsfh.c contains two static variables nfsd_nr_verified and nfsd_nr_put. These are counters which are incremented as a side effect of the fh_verify() fh_compose() and fh_put() operations, i.e. at least twice per NFS call for any non-trivial workload. Needless to say this makes the cacheline that contains them (and any other innocent victims) a very hot contention point indeed under high call-rate workloads on multiprocessor NFS server. It also turns out that these counters are not used anywhere. They're not reported to userspace, they're not used in logic, they're not even exported from the object file (let alone the module). All they do is waste CPU time. So this patch removes them. Tests on a 16 CPU Altix A4700 with 2 10gige Myricom cards, configured separately (no bonding). Workload is 640 client threads doing directory traverals with random small reads, from server RAM. Before ====== Kernel profile: % cumulative self self total time samples samples calls 1/call 1/call name 6.05 2716.00 2716.00 30406 0.09 1.02 svc_process 4.44 4706.00 1990.00 1975 1.01 1.01 spin_unlock_irqrestore 3.72 6376.00 1670.00 1666 1.00 1.00 svc_export_put 3.41 7907.00 1531.00 1786 0.86 1.02 nfsd_ofcache_lookup 3.25 9363.00 1456.00 10965 0.13 1.01 nfsd_dispatch 3.10 10752.00 1389.00 1376 1.01 1.01 nfsd_cache_lookup 2.57 11907.00 1155.00 4517 0.26 1.03 svc_tcp_recvfrom ... 2.21 15352.00 1003.00 1081 0.93 1.00 nfsd_choose_ofc <---- ^^^^ Here the function nfsd_choose_ofc() reads a global variable which by accident happened to be located in the same cacheline as nfsd_nr_verified. Call rate: nullarbor:~ # pmdumptext nfs3.server.calls ... Thu Dec 13 00:15:27 184780.663 Thu Dec 13 00:15:28 184885.881 Thu Dec 13 00:15:29 184449.215 Thu Dec 13 00:15:30 184971.058 Thu Dec 13 00:15:31 185036.052 Thu Dec 13 00:15:32 185250.475 Thu Dec 13 00:15:33 184481.319 Thu Dec 13 00:15:34 185225.737 Thu Dec 13 00:15:35 185408.018 Thu Dec 13 00:15:36 185335.764 After ===== kernel profile: % cumulative self self total time samples samples calls 1/call 1/call name 6.33 2813.00 2813.00 29979 0.09 1.01 svc_process 4.66 4883.00 2070.00 2065 1.00 1.00 spin_unlock_irqrestore 4.06 6687.00 1804.00 2182 0.83 1.00 nfsd_ofcache_lookup 3.20 8110.00 1423.00 10932 0.13 1.00 nfsd_dispatch 3.03 9456.00 1346.00 1343 1.00 1.00 nfsd_cache_lookup 2.62 10622.00 1166.00 4645 0.25 1.01 svc_tcp_recvfrom [...] 0.10 42586.00 44.00 74 0.59 1.00 nfsd_choose_ofc <--- HA!! ^^^^ Call rate: nullarbor:~ # pmdumptext nfs3.server.calls ... Thu Dec 13 01:45:28 194677.118 Thu Dec 13 01:45:29 193932.692 Thu Dec 13 01:45:30 194294.364 Thu Dec 13 01:45:31 194971.276 Thu Dec 13 01:45:32 194111.207 Thu Dec 13 01:45:33 194999.635 Thu Dec 13 01:45:34 195312.594 Thu Dec 13 01:45:35 195707.293 Thu Dec 13 01:45:36 194610.353 Thu Dec 13 01:45:37 195913.662 Thu Dec 13 01:45:38 194808.675 i.e. about a 5.3% improvement in call rate. Signed-off-by: Greg Banks <gnb@melbourne.sgi.com> Reviewed-by: David Chinner <dgc@sgi.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-27knfsd: fix reply cache memory corruptionGreg Banks
Fix a regression in the reply cache introduced when the code was converted to use proper Linux lists. When a new entry needs to be inserted, the case where all the entries are currently being used by threads is not correctly detected. This can result in memory corruption and a crash. In the current code this is an extremely unlikely corner case; it would require the machine to have 1024 nfsd threads and all of them to be busy at the same time. However, upcoming reply cache changes make this more likely; a crash due to this problem was actually observed in field. Signed-off-by: Greg Banks <gnb@sgi.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-27knfsd: reply cache cleanupsGreg Banks
Make REQHASH() an inline function. Rename hash_list to cache_hash. Fix an obsolete comment. Signed-off-by: Greg Banks <gnb@sgi.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-11nfsd: silence lockdep warningJ. Bruce Fields
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-06nfsd: nfs4_stat_init cleanupWang Chen
Save some loop time. Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-06nfsd4: check for negative dentry before use in nfsv4 readdirJ. Bruce Fields
After 2f9092e1020246168b1309b35e085ecd7ff9ff72 "Fix i_mutex vs. readdir handling in nfsd" (and 14f7dd63 "Copy XFS readdir hack into nfsd code"), an entry may be removed between the first mutex_unlock and the second mutex_lock. In this case, lookup_one_len() will return a negative dentry. Check for this case to avoid a NULL dereference. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Reviewed-by: J. R. Okajima <hooanon05@yahoo.co.jp> Cc: stable@kernel.org
2009-05-03nfsd: use C99 struct initializersRandy Dunlap
Eliminate 56 sparse warnings like this one: fs/nfsd/nfs4xdr.c:1331:15: warning: obsolete array initializer, use C99 syntax Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-03nfsd4: make recall callback an asynchronous rpcJ. Bruce Fields
As with the probe, this removes the need for another kthread. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-03nfsd41: slots are freed with sessionAndy Adamson
The session and slots are allocated all in one piece. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-01nfsd4: track recall retries in nfs4_delegationJ. Bruce Fields
Move this out of a local variable into the nfs4_delegation object in preparation for making this an async rpc call (at which point we'll need any state like this in a common object that's preserved across function calls). Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-01nfsd4: remove unused dl_truncJ. Bruce Fields
There's no point in keeping this field around--it's always zero. (Background: the protocol allows you to tell the client that the file is about to be truncated, as an optimization to save the client from writing back dirty pages that will just be discarded. We don't implement this hint. If we do some day, adding this field back in will be the least of the work involved.) Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-01nfsd4: eliminate struct nfs4_cb_recallJ. Bruce Fields
The nfs4_cb_recall struct is used only in nfs4_delegation, so its pointer to the containing delegation is unnecessary--we could just use container_of(). But there's no real reason to have this a separate struct at all--just move these fields to nfs4_delegation. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-05-01nfsd4: rename callback struct to cb_connJ. Bruce Fields
I want to use the name for a struct that actually does represent a single callback. (Actually, I've never been sure it helps to a separate struct for the callback information. Some day maybe those fields could just be dumped into struct nfs4_client. I don't know.) Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd4: replace callback thread by asynchronous rpcJ. Bruce Fields
We don't really need a synchronous rpc, and moving to an asynchronous rpc allows us to do without this extra kthread. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd4: lookup up callback cred only onceJ. Bruce Fields
Lookup the callback cred once and then use it for all subsequent callbacks. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd4: create rpc callback client from server threadJ. Bruce Fields
The code is a little simpler, and it should be easier to avoid races, if we just do all rpc client creation/destruction from nfsd or laundromat threads and do only the rpc calls themselves asynchronously. The rpc creation doesn't involve any significant waiting (it doesn't call the client, for example), so there's no reason not to do this. Also don't bother destroying the client on failure of the rpc null probe. We may want to retry the probe later anyway. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd4: set cb_client inside setup_callback_clientJ. Bruce Fields
This is just a minor code simplification. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd4: set shorter timeoutJ. Bruce Fields
We tried to do something overly complicated with the callback rpc timeouts here. And they're wrong--the result is that by the time a single callback times out, it's already too late to tell the client (using the cb_path_down return to RENEW) that the callback is down. Use a much shorter, simpler timeout. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd4: setclientid_confirm callback-change fixesJ. Bruce Fields
This setclientid_confirm case should allow the client to change callbacks, but it currently has a dummy implementation that just turns off callbacks completely. That dummy implementation isn't completely correct either, though: - There's no need to remove any client recovery directory in this case. - New clientid confirm verifiers should be generated (and returned) in setclientid; there's no need to generate a new one here. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd: quiet compile warningJ. Bruce Fields
Stephen Rothwell said: "Today's linux-next build (powerpc ppc64_defconfig) produced this new warning: fs/nfsd/nfs4state.c: In function 'EXPIRED_STATEID': fs/nfsd/nfs4state.c:2757: warning: comparison of distinct pointer types lacks a cast Caused by commit 78155ed75f470710f2aecb3e75e3d97107ba8374 ("nfsd4: distinguish expired from stale stateids")." Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-04-29nfsd: support ext4 i_versionJ. Bruce Fields
ext4 supports a real NFSv4 change attribute, which is bumped whenever the ctime would be updated, including times when two updates arrive within a jiffy of each other. (Note that although ext4 has space for nanosecond-precision ctime, the real resolution is lower: it actually uses jiffies as the time-source.) This ensures clients will invalidate their caches when they need to. There is some fear that keeping the i_version up-to-date could have performance drawbacks, so for now it's turned on only by a mount option. We hope to do something better eventually. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: Theodore Tso <tytso@mit.edu>
2009-04-29nfsd4: delete obsolete xdr commentsJ. Bruce Fields
We don't need comments to tell us these macros are ugly. And we're long past trying to share any of this code with the BSD's. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-29nfsd: eliminate ENCODE_HEAD macroJ. Bruce Fields
This macro doesn't serve any useful purpose. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-28NFSD: Stricter buffer size checking in fs/nfsd/nfsctl.cChuck Lever
Clean up: For consistency, handle output buffer size checking in a other nfsctl functions the same way it's done for write_versions(). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-04-28NFSD: Stricter buffer size checking in write_versions()Chuck Lever
While it's not likely today that there are enough NFS versions to overflow the output buffer in write_versions(), we should be more careful about detecting the end of the buffer. The number of NFS versions will only increase as NFSv4 minor versions are added. Note that this API doesn't behave the same as portlist. Here we attempt to display as many versions as will fit in the buffer, and do not provide any indication that an overflow would have occurred. I don't have any good rationale for that. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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