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* Merge sys_clone()/sys_unshare() nsproxy and namespace handlingBadari Pulavarty2007-05-081-23/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | sys_clone() and sys_unshare() both makes copies of nsproxy and its associated namespaces. But they have different code paths. This patch merges all the nsproxy and its associated namespace copy/clone handling (as much as possible). Posted on container list earlier for feedback. - Create a new nsproxy and its associated namespaces and pass it back to caller to attach it to right process. - Changed all copy_*_ns() routines to return a new copy of namespace instead of attaching it to task->nsproxy. - Moved the CAP_SYS_ADMIN checks out of copy_*_ns() routines. - Removed unnessary !ns checks from copy_*_ns() and added BUG_ON() just incase. - Get rid of all individual unshare_*_ns() routines and make use of copy_*_ns() instead. [akpm@osdl.org: cleanups, warning fix] [clg@fr.ibm.com: remove dup_namespaces() declaration] [serue@us.ibm.com: fix CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) retval] [akpm@linux-foundation.org: fix build with CONFIG_SYSVIPC=n] Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: <containers@lists.osdl.org> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* exec: fix remove_arg_zeroNick Piggin2007-05-081-16/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | Petr Tesarik discovered a problem in remove_arg_zero(). He writes: When a script is loaded, load_script() replaces argv[0] with the name of the interpreter and the filename passed to the exec syscall. However, there is no guarantee that the length of the interpreter name plus the length of the filename is greater than the length of the original argv[0]. If the difference happens to cross a page boundary, setup_arg_pages() will call put_dirty_page() [aka install_arg_page()] with an address outside the VMA. Therefore, remove_arg_zero() must free all pages which would be unused after the argument is removed. So, rewrite the remove_arg_zero function without gotos, with a few comments, and with the commonly used explicit index/offset. This fixes the problem and makes it easier to understand as well. [a.p.zijlstra@chello.nl: add comment] Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Petr Tesarik <ptesarik@suse.cz> 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>
* reiserfs: correct misspelled "REISERFS_PROC_INFO" to "CONFIG_REISERFS_PROC_INFO"Robert P. J. Day2007-05-081-1/+1
| | | | | | | | | Correct the misspelling of the preprocessor check of a Kconfig option to refer to CONFIG_REISERFS_PROC_INFO and not just the incorrect REISERFS_PROC_INFO. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* reiserfs: shrink superblock if no xattrsAlexey Dobriyan2007-05-081-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | This makes in-core superblock fit into one cacheline here. Before: struct dentry * xattr_root; /* 124 4 */ /* --- cacheline 1 boundary (128 bytes) --- */ struct rw_semaphore xattr_dir_sem; /* 128 12 */ int j_errno; /* 140 4 */ }; /* size: 144, cachelines: 2 */ /* sum members: 142, holes: 1, sum holes: 2 */ /* last cacheline: 16 bytes */ After: int j_errno; /* 124 4 */ /* --- cacheline 1 boundary (128 bytes) --- */ }; /* size: 128, cachelines: 1 */ /* sum members: 126, holes: 1, sum holes: 2 */ Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: <reiserfs-dev@namesys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* reiserfs: possible null pointer dereference during resizeDmitriy Monakhov2007-05-081-0/+4
| | | | | | | | | | sb_read may return NULL, let's explicitly check it. If so free new bitmap blocks array, after this we may safely exit as it done above during bitmap allocation. Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* freevxfs: possible null pointer dereference fixDmitriy Monakhov2007-05-082-2/+2
| | | | | | | | | sb_read may return NULL, so let's explicitly check it. Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* is_power_of_2 in fs/block_dev.cVignesh Babu BM2007-05-081-1/+2
| | | | | | | | Replace (n & (n-1)) in the context of power of 2 checks with is_power_of_2 Signed-off-by: vignesh babu <vignesh.babu@wipro.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* is_power_of_2 in fs/hfsVignesh Babu BM2007-05-082-2/+4
| | | | | | | | | Replace (n & (n-1)) in the context of power of 2 checks with is_power_of_2 Signed-off-by: vignesh babu <vignesh.babu@wipro.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* is_power_of_2 in fatVignesh Babu BM2007-05-081-4/+3
| | | | | | | | | | Replacing (n & (n-1)) in the context of power of 2 checks with is_power_of_2 Signed-off-by: vignesh babu <vignesh.babu@wipro.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* devpts: add fsnotify create eventFlorin Malita2007-05-081-1/+4
| | | | | | | | | | | | | | Currently, devpts doesn't generate an fsnotify event upon pts creation because the regular vfs paths aren't involved. Deallocation, on the other hand, correctly generates a nameremove event thanks to the d_delete() invocation in devpts_pty_kill(). This patch adds the missing fsnotify_create() trigger in devpts_pty_new(). Signed-off-by: Florin Malita <fmalita@gmail.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* use use SEEK_MAX to validate user lseek argumentsChris Snook2007-05-081-2/+2
| | | | | | | | | Add SEEK_MAX and use it to validate lseek arguments from userspace. Signed-off-by: Chris Snook <csnook@redhat.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* use symbolic constants in generic lseek codeChris Snook2007-05-081-6/+6
| | | | | | | | | Convert magic numbers to SEEK_* values from fs.h Signed-off-by: Chris Snook <csnook@redhat.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: shrink parent dentries when shrinking slabAndrew Morton2007-05-081-1/+1
| | | | | | | | | | | | | | | | Teach the dentry slab shrinker to aggressively shrink parent dentries when shrinking the dentry cache. This is done to attempt to improve the situation where the dentry slab cache gets a lot of internal fragmentation due to pages containing directory dentries. It is expected that this change will cause some of those dentries to be reaped earlier, and with less scanning. Needs careful testing. Cc: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fix quadratic behavior of shrink_dcache_parent()Miklos Szeredi2007-05-081-37/+67
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The time shrink_dcache_parent() takes, grows quadratically with the depth of the tree under 'parent'. This starts to get noticable at about 10,000. These kinds of depths don't occur normally, and filesystems which invoke shrink_dcache_parent() via d_invalidate() seem to have other depth dependent timings, so it's not even easy to expose this problem. However with FUSE it's easy to create a deep tree and d_invalidate() will also get called. This can make a syscall hang for a very long time. This is the original discovery of the problem by Russ Cox: http://article.gmane.org/gmane.comp.file-systems.fuse.devel/3826 The following patch fixes the quadratic behavior, by optionally allowing prune_dcache() to prune ancestors of a dentry in one go, instead of doing it one at a time. Common code in dput() and prune_one_dentry() is extracted into a new helper function d_kill(). shrink_dcache_parent() as well as shrink_dcache_sb() are converted to use the ancestry-pruner option. Only for shrink_dcache_memory() is this behavior not desirable, so it keeps using the old algorithm. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Maneesh Soni <maneesh@in.ibm.com> Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: Dipankar Sarma <dipankar@in.ibm.com> Cc: Neil Brown <neilb@suse.de> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* reduce size of task_struct on 64-bit machinesWilliam Cohen2007-05-081-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | This past week I was playing around with that pahole tool (http://oops.ghostprotocols.net:81/acme/dwarves/) and looking at the size of various struct in the kernel. I was surprised by the size of the task_struct on x86_64, approaching 4K. I looked through the fields in task_struct and found that a number of them were declared as "unsigned long" rather than "unsigned int" despite them appearing okay as 32-bit sized fields. On x86_64 "unsigned long" ends up being 8 bytes in size and forces 8 byte alignment. Is there a reason there a reason they are "unsigned long"? The patch below drops the size of the struct from 3808 bytes (60 64-byte cachelines) to 3760 bytes (59 64-byte cachelines). A couple other fields in the task struct take a signficant amount of space: struct thread_struct thread; 688 struct held_lock held_locks[30]; 1680 CONFIG_LOCKDEP is turned on in the .config [akpm@linux-foundation.org: fix printk warnings] Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ext2/3/4: fix file date underflow on ext2 3 filesystems on 64 bit systemsMarkus Rechberger2007-05-083-9/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Taken from http://bugzilla.kernel.org/show_bug.cgi?id=5079 signed long ranges from -2.147.483.648 to 2.147.483.647 on x86 32bit 10000011110110100100111110111101 .. -2,082,844,739 10000011110110100100111110111101 .. 2,212,122,557 <- this currently gets stored on the disk but when converting it to a 64bit signed long value it loses its sign and becomes positive. Cc: Andreas Dilger <adilger@dilger.ca> Cc: <linux-ext4@vger.kernel.org> Andreas says: This patch is now treating timestamps with the high bit set as negative times (before Jan 1, 1970). This means we lose 1/2 of the possible range of timestamps (lopping off 68 years before unix timestamp overflow - now only 30 years away :-) to handle the extremely rare case of setting timestamps into the distant past. If we are only interested in fixing the underflow case, we could just limit the values to 0 instead of storing negative values. At worst this will skew the timestamp by a few hours for timezones in the far east (files would still show Jan 1, 1970 in "ls -l" output). That said, it seems 32-bit systems (mine at least) allow files to be set into the past (01/01/1907 works fine) so it seems this patch is bringing the x86_64 behaviour into sync with other kernels. On the plus side, we have a patch that is ready to add nanosecond timestamps to ext3 and as an added bonus adds 2 high bits to the on-disk timestamp so this extends the maximum date to 2242. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Allow access to /proc/$PID/fd after setuid()Alexey Dobriyan2007-05-081-0/+18
| | | | | | | | | | | | | | | | | | | | | | /proc/$PID/fd has r-x------ permissions, so if process does setuid(), it will not be able to access /proc/*/fd/. This breaks fstatat() emulation in glibc. open("foo", O_RDONLY|O_DIRECTORY) = 4 setuid32(65534) = 0 stat64("/proc/self/fd/4/bar", 0xbfafb298) = -1 EACCES (Permission denied) Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: James Morris <jmorris@namei.org> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Ulrich Drepper <drepper@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Acked-By: Kirill Korotaev <dev@openvz.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* block_write_full_page(): report ENOSPCAndrew Morton2007-05-081-0/+1
| | | | | | | | block_write_full_page() forgot to propagate ENPSOC into the address_space. Cc: Guillaume Chazarain <guichaz@yahoo.fr> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Factor outstanding I/O error handlingGuillaume Chazarain2007-05-082-18/+3
| | | | | | | | | | Cleanup: setting an outstanding error on a mapping was open coded too many times. Factor it out in mapping_set_error(). Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr> Cc: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* uml: hostfs style fixesJeff Dike2007-05-083-171/+167
| | | | | | | | | hostfs needed some style goodness. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* uml: make hostfs_setattr() support operations on unlinked open filesAlberto Bertogli2007-05-083-44/+74
| | | | | | | | | | | | | | | | | | This patch allows hostfs_setattr() to work on unlinked open files by calling set_attr() (the userspace part) with the inode's fd. Without this, applications that depend on doing attribute changes to unlinked open files will fail. It works by using the fd versions instead of the path ones (for example fchmod() instead of chmod(), fchown() instead of chown()) when an fd is available. Signed-off-by: Alberto Bertogli <albertito@gmail.com> Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: move common segment checks to separate helper functionDmitriy Monakhov2007-05-082-37/+6
| | | | | | | | | | [akpm@linux-foundation.org: cleanup] Signed-off-by: Monakhov Dmitriy <dmonakhov@openvz.org> Cc: Christoph Hellwig <hch@lst.de> Acked-by: Anton Altaparmakov <aia21@cam.ac.uk> Acked-by: David Chinner <dgc@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2007-05-0712-200/+524
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux: gfs2: nfs lock support for gfs2 lockd: add code to handle deferred lock requests lockd: always preallocate block in nlmsvc_lock() lockd: handle test_lock deferrals lockd: pass cookie in nlmsvc_testlock lockd: handle fl_grant callbacks lockd: save lock state on deferral locks: add fl_grant callback for asynchronous lock return nfsd4: Convert NFSv4 to new lock interface locks: add lock cancel command locks: allow {vfs,posix}_lock_file to return conflicting lock locks: factor out generic/filesystem switch from setlock code locks: factor out generic/filesystem switch from test_lock locks: give posix_test_lock same interface as ->lock locks: make ->lock release private data before returning in GETLK case locks: create posix-to-flock helper functions locks: trivial removal of unnecessary parentheses
| * gfs2: nfs lock support for gfs2Marc Eshel2007-05-062-10/+104
| | | | | | | | | | | | | | | | Add NFS lock support to GFS2. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Acked-by: Steven Whitehouse <swhiteho@redhat.com>
| * lockd: add code to handle deferred lock requestsMarc Eshel2007-05-064-7/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rewrite nlmsvc_lock() to use the asynchronous interface. As with testlock, we answer nlm requests in nlmsvc_lock by first looking up the block and then using the results we find in the block if B_QUEUED is set, and calling vfs_lock_file() otherwise. If this a new lock request and we get -EINPROGRESS return on a non-blocking request then we defer the request. Also modify nlmsvc_unlock() to call the filesystem method if appropriate. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * lockd: always preallocate block in nlmsvc_lock()Marc Eshel2007-05-061-23/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Normally we could skip ever having to allocate a block in the case where the client asks for a non-blocking lock, or asks for a blocking lock that succeeds immediately. However we're going to want to always look up a block first in order to check whether we're revisiting a deferred lock call, and to be prepared to handle the case where the filesystem returns -EINPROGRESS--in that case we want to make sure the lock we've given the filesystem is the one embedded in the block that we'll use to track the deferred request. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * lockd: handle test_lock deferralsMarc Eshel2007-05-063-16/+73
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rewrite nlmsvc_testlock() to use the new asynchronous interface: instead of immediately doing a posix_test_lock(), we first look for a matching block. If the subsequent test_lock returns anything other than -EINPROGRESS, we then remove the block we've found and return the results. If it returns -EINPROGRESS, then we defer the lock request. In the case where the block we find in the first step has B_QUEUED set, we bypass the vfs_test_lock entirely, instead using the block to decide how to respond: with nlm_lck_denied if B_TIMED_OUT is set. with nlm_granted if B_GOT_CALLBACK is set. by dropping if neither B_TIMED_OUT nor B_GOT_CALLBACK is set Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * lockd: pass cookie in nlmsvc_testlockMarc Eshel2007-05-063-4/+5
| | | | | | | | | | | | | | | | | | | | Change NLM internal interface to pass more information for test lock; we need this to make sure the cookie information is pushed down to the place where we do request deferral, which is handled for testlock by the following patch. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * lockd: handle fl_grant callbacksMarc Eshel2007-05-061-4/+87
| | | | | | | | | | | | | | Add code to handle file system callback when the lock is finally granted. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * lockd: save lock state on deferralMarc Eshel2007-05-061-0/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | We need to keep some state for a pending asynchronous lock request, so this patch adds that state to struct nlm_block. This also adds a function which defers the request, by calling rqstp->rq_chandle.defer and storing the resulting deferred request in a nlm_block structure which we insert into lockd's global block list. That new function isn't called yet, so it's dead code until a later patch. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * locks: add fl_grant callback for asynchronous lock returnMarc Eshel2007-05-061-0/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Acquiring a lock on a cluster filesystem may require communication with remote hosts, and to avoid blocking lockd or nfsd threads during such communication, we allow the results to be returned asynchronously. When a ->lock() call needs to block, the file system will return -EINPROGRESS, and then later return the results with a call to the routine in the fl_grant field of the lock_manager_operations struct. This differs from the case when ->lock returns -EAGAIN to a blocking lock request; in that case, the filesystem calls fl_notify when the lock is granted, and the caller retries the original lock. So while fl_notify is merely a hint to the caller that it should retry, fl_grant actually communicates the final result of the lock operation (with the lock already acquired in the succesful case). Therefore fl_grant takes a lock, a status and, for the test lock case, a conflicting lock. We also allow fl_grant to return an error to the filesystem, to handle the case where the fl_grant requests arrives after the lock manager has already given up waiting for it. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * nfsd4: Convert NFSv4 to new lock interfaceMarc Eshel2007-05-061-7/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | Convert NFSv4 to the new lock interface. We don't define any callback for now, so we're not taking advantage of the asynchronous feature--that's less critical for the multi-threaded nfsd then it is for the single-threaded lockd. But this does allow a cluster filesystems to export cluster-coherent locking to NFS. Note that it's cluster filesystems that are the issue--of the filesystems that define lock methods (nfs, cifs, etc.), most are not exportable by nfsd. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| * locks: add lock cancel commandMarc Eshel2007-05-061-0/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Lock managers need to be able to cancel pending lock requests. In the case where the exported filesystem manages its own locks, it's not sufficient just to call posix_unblock_lock(); we need to let the filesystem know what's happening too. We do this by adding a new fcntl lock command: FL_CANCELLK. Some day this might also be made available to userspace applications that could benefit from an asynchronous locking api. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
| * locks: allow {vfs,posix}_lock_file to return conflicting lockMarc Eshel2007-05-064-33/+30
| | | | | | | | | | | | | | | | | | | | | | | | The nfsv4 protocol's lock operation, in the case of a conflict, returns information about the conflicting lock. It's unclear how clients can use this, so for now we're not going so far as to add a filesystem method that can return a conflicting lock, but we may as well return something in the local case when it's easy to. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
| * locks: factor out generic/filesystem switch from setlock codeMarc Eshel2007-05-061-32/+36
| | | | | | | | | | | | | | | | | | | | | | Factor out the code that switches between generic and filesystem-specific lock methods; eventually we want to call this from lock managers (lockd and nfsd) too; currently they only call the generic methods. This patch does that for all the setlk code. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
| * locks: factor out generic/filesystem switch from test_lockJ. Bruce Fields2007-05-061-13/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Factor out the code that switches between generic and filesystem-specific lock methods; eventually we want to call this from lock managers (lockd and nfsd) too; currently they only call the generic methods. This patch does that for test_lock. Note that this hasn't been necessary until recently, because the few filesystems that define ->lock() (nfs, cifs...) aren't exportable via NFS. However GFS (and, in the future, other cluster filesystems) need to implement their own locking to get cluster-coherent locking, and also want to be able to export locking to NFS (lockd and NFSv4). So we accomplish this by factoring out code such as this and exporting it for the use of lockd and nfsd. Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
| * locks: give posix_test_lock same interface as ->lockMarc Eshel2007-05-067-50/+31
| | | | | | | | | | | | | | | | | | posix_test_lock() and ->lock() do the same job but have gratuitously different interfaces. Modify posix_test_lock() so the two agree, simplifying some code in the process. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
| * locks: make ->lock release private data before returning in GETLK caseJ. Bruce Fields2007-05-062-4/+1
| | | | | | | | | | | | | | | | | | | | | | | | The file_lock argument to ->lock is used to return the conflicting lock when found. There's no reason for the filesystem to return any private information with this conflicting lock, but nfsv4 is. Fix nfsv4 client, and modify locks.c to stop calling fl_release_private for it in this case. Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu> Cc: "Trond Myklebust" <Trond.Myklebust@netapp.com>"
| * locks: create posix-to-flock helper functionsJ. Bruce Fields2007-04-161-25/+36
| | | | | | | | | | | | | | | | Factor out a bit of messy code by creating posix-to-flock counterparts to the existing flock-to-posix helper functions. Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
| * locks: trivial removal of unnecessary parenthesesJ. Bruce Fields2007-04-161-2/+2
| | | | | | | | | | | | Remove some unnecessary parentheses. Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmwLinus Torvalds2007-05-0725-2058/+2150
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw: (34 commits) [GFS2] Uncomment sprintf_symbol calling code [DLM] lowcomms style [GFS2] printk warning fixes [GFS2] Patch to fix mmap of stuffed files [GFS2] use lib/parser for parsing mount options [DLM] Lowcomms nodeid range & initialisation fixes [DLM] Fix dlm_lowcoms_stop hang [DLM] fix mode munging [GFS2] lockdump improvements [GFS2] Patch to detect corrupt number of dir entries in leaf and/or inode blocks [GFS2] bz 236008: Kernel gpf doing cat /debugfs/gfs2/xxx (lock dump) [DLM] fs/dlm/ast.c should #include "ast.h" [DLM] Consolidate transport protocols [DLM] Remove redundant assignment [GFS2] Fix bz 234168 (ignoring rgrp flags) [DLM] change lkid format [DLM] interface for purge (2/2) [DLM] add orphan purging code (1/2) [DLM] split create_message function [GFS2] Set drop_count to 0 (off) by default ...
| * | [GFS2] Uncomment sprintf_symbol calling codeSteven Whitehouse2007-05-011-12/+0
| | | | | | | | | | | | | | | | | | | | | | | | Now that the patch from -mm has gone upstream, we can uncomment the code in GFS2 which uses sprintf_symbol. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Robert Peterson <rpeterso@redhat.com>
| * | [DLM] lowcomms styleDavid Teigland2007-05-011-30/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | Replace some printk with log_print, and fix some simple cases of lines over 80. Also, return -ENOTCONN if lowcomms_start fails due to no local IP address being available. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | [GFS2] printk warning fixesakpm@linux-foundation.org2007-05-011-4/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | alpha: fs/gfs2/dir.c: In function 'gfs2_dir_read_leaf': fs/gfs2/dir.c:1322: warning: format '%llu' expects type 'long long unsigned int', but argument 3 has type 'sector_t' fs/gfs2/dir.c: In function 'gfs2_dir_read': fs/gfs2/dir.c:1455: warning: format '%llu' expects type 'long long unsigned int', but argument 3 has type '__u64' Cc: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | [GFS2] Patch to fix mmap of stuffed filesSteven Whitehouse2007-05-011-3/+14
| | | | | | | | | | | | | | | | | | | | | | | | If a stuffed file is mmaped and a page fault is generated at some offset above the initial page, we need to create a zero page to hang the buffer heads off before we can unstuff the file. This is a fix for bz #236087 Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | [GFS2] use lib/parser for parsing mount optionsJosef Bacik2007-05-011-96/+143
| | | | | | | | | | | | | | | | | | | | | | | | This patch converts the mount option parsing to use the kernels lib/parser stuff like all of the other filesystems. I tested this and it works well. Thank you, Signed-off-by: Josef Bacik <jwhiter@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | [DLM] Lowcomms nodeid range & initialisation fixesPatrick Caulfield2007-05-011-9/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix a few range & initialization bugs in lowcomms. - max_nodeid is really the highest nodeid encountered, so all loops must include it in their iterations. - clean dlm_local_count & connection_idr so we can do a clean restart. - Remove a spurious BUG_ON Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | [DLM] Fix dlm_lowcoms_stop hangJosef Bacik2007-05-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | When you attempt to release a lockspace in DLM, it will hang trying to down a semaphore that has already been downed. The attached patch fixes the problem. Signed-off-by: Josef Bacik <jwhiter@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Patrick Caulfield <pcaulfie@redhat.com>
| * | [DLM] fix mode mungingDavid Teigland2007-05-011-2/+80
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are flags to enable two specialized features in the dlm: 1. CONVDEADLK causes the dlm to resolve conversion deadlocks internally by changing the granted mode of locks to NL. 2. ALTPR/ALTCW cause the dlm to change the requested mode of locks to PR or CW to grant them if the normal requested mode can't be granted. GFS direct i/o exercises both of these features, especially when mixed with buffered i/o. The dlm has problems with them. The first problem is on the master node. If it demotes a lock as a part of converting it, the actual step of converting the lock isn't being done after the demotion, the lock is just left sitting on the granted queue with a granted mode of NL. I think the mistaken assumption was that the call to grant_pending_locks() would grant it, but that function naturally doesn't look at locks on the granted queue. The second problem is on the process node. If the master either demotes or gives an altmode, the munging of the gr/rq modes is never done in the process copy of the lock, leaving the master/process copies out of sync. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | [GFS2] lockdump improvementsRobert Peterson2007-05-013-9/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch below consists of the following changes (in code order): 1. I fixed a minor compiler warning regarding the printing of a kernel symbol address. 2. I implemented a suggestion from Dave Teigland that moves the debugfs information for gfs2 into a subdirectory so we can easily expand our use of debugfs in the future. The current code keeps the glock information in: /debug/gfs2/<fs> With the patch, the new code keeps the glock information in: /debug/gfs2/<fs>/glock That will allow us to create more debugfs files in the future. 3. This fixes a bug whereby a failed mount attempt causes the debugfs file to not be deleted. Failed mount attempts should always clean up after themselves, including deleting the debugfs file and/or directory. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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