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* GFS2: Use DEFINE_SPINLOCKJulia Lawall2009-01-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | SPIN_LOCK_UNLOCKED is deprecated. The following makes the change suggested in Documentation/spinlocks.txt The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @@ declarer name DEFINE_SPINLOCK; identifier xxx_lock; @@ - spinlock_t xxx_lock = SPIN_LOCK_UNLOCKED; + DEFINE_SPINLOCK(xxx_lock); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* Revert "GFS2: Fix use-after-free bug on umount"Steven Whitehouse2009-01-051-2/+1
| | | | | | | | | | This reverts commit 78802499912f1ba31ce83a94c55b5a980f250a43. The original patch is causing problems in relation to order of operations at umount in relation to jdata files. I need to fix this a different way. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: Fix use-after-free bug on umountSteven Whitehouse2009-01-051-1/+2
| | | | | | | | | | | | | | | There was a use-after-free with the GFS2 super block during umount. This patch moves almost all of the umount code from ->put_super into ->kill_sb, the only bit that cannot be moved being the glock hash clearing which has to remain as ->put_super due to umount ordering requirements. As a result its now obvious that the kfree is the final operation, whereas before it was hidden in ->put_super. Also gfs2_jindex_free is then only referenced from a single file so thats moved and marked static too. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: Move four functions from super.cSteven Whitehouse2009-01-051-0/+14
| | | | | | | | | | The functions which are being moved can all be marked static in their new locations, since they only have a single caller each. Their new locations are more logical than before and some of the functions are small enough that the compiler might well inline them. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: Kill two daemons with one patchSteven Whitehouse2009-01-051-143/+105
| | | | | | | | | | | | | | | | | | | | | | | | | | This patch removes the two daemons, gfs2_scand and gfs2_glockd and replaces them with a shrinker which is called from the VM. The net result is that GFS2 responds better when there is memory pressure, since it shrinks the glock cache at the same rate as the VFS shrinks the dcache and icache. There are no longer any time based criteria for shrinking glocks, they are kept until such time as the VM asks for more memory and then we demote just as many glocks as required. There are potential future changes to this code, including the possibility of sorting the glocks which are to be written back into inode number order, to get a better I/O ordering. It would be very useful to have an elevator based workqueue implementation for this, as that would automatically deal with the read I/O cases at the same time. This patch is my answer to Andrew Morton's remark, made during the initial review of GFS2, asking why GFS2 needs so many kernel threads, the answer being that it doesn't :-) This patch is a net loss of about 200 lines of code. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: Fix "truncate in progress" hangSteven Whitehouse2009-01-051-4/+29
| | | | | | | | | | | | | | | | | | | | | | | Following on from the recent clean up of gfs2_quotad, this patch moves the processing of "truncate in progress" inodes from the glock workqueue into gfs2_quotad. This fixes a hang due to the "truncate in progress" processing requiring glocks in order to complete. It might seem odd to use gfs2_quotad for this particular item, but we have to use a pre-existing thread since creating a thread implies a GFP_KERNEL memory allocation which is not allowed from the glock workqueue context. Of the existing threads, gfs2_logd and gfs2_recoverd may deadlock if used for this operation. gfs2_scand and gfs2_glockd are both scheduled for removal at some (hopefully not too distant) future point. That leaves only gfs2_quotad whose workload is generally fairly light and is easily adapted for this extra task. Also, as a result of this change, it opens the way for a future patch to make the reading of the inode's information asynchronous with respect to the glock workqueue, which is another improvement that has been on the list for some time now. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: sparse annotation of gl->gl_spinHarvey Harrison2009-01-051-0/+8
| | | | | | | | | | | | fs/gfs2/glock.c:308:5: warning: context problem in 'do_promote': '_spin_unlock' expected different context fs/gfs2/glock.c:308:5: context '*gl+28': wanted >= 1, got 0 fs/gfs2/glock.c:529:2: warning: context problem in 'do_xmote': '_spin_unlock' expected different context fs/gfs2/glock.c:529:2: context '*gl+28': wanted >= 1, got 0 fs/gfs2/glock.c:925:3: warning: context problem in 'add_to_queue': '_spin_unlock' expected different context fs/gfs2/glock.c:925:3: context '*gl+28': wanted >= 1, got 0 Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: high time to take some time over atimeSteven Whitehouse2008-09-181-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Until now, we've used the same scheme as GFS1 for atime. This has failed since atime is a per vfsmnt flag, not a per fs flag and as such the "noatime" flag was not getting passed down to the filesystems. This patch removes all the "special casing" around atime updates and we simply use the VFS's atime code. The net result is that GFS2 will now support all the same atime related mount options of any other filesystem on a per-vfsmnt basis. We do lose the "lazy atime" updates, but we gain "relatime". We could add lazy atime to the VFS at a later date, if there is a requirement for that variant still - I suspect relatime will be enough. Also we lose about 100 lines of code after this patch has been applied, and I have a suspicion that it will speed things up a bit, even when atime is "on". So it seems like a nice clean up as well. From a user perspective, everything stays the same except the loss of the per-fs atime quantum tweekable (ought to be per-vfsmnt at the very least, and to be honest I don't think anybody ever used it) and that a number of options which were ignored before now work correctly. Please let me know if you've got any comments. I'm pushing this out early so that you can all see what my plans are. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: Fix race relating to glock min-hold timeSteven Whitehouse2008-09-051-0/+2
| | | | | | | | | | | | | | In the case that a request for a glock arrives right after the grant reply has arrived, it sometimes means that the gl_tstamp field hasn't been updated recently enough. The net result is that the min-hold time for the glock is ignored. If this happens often enough, it leads to poor performance. This patch adds an additional test, so that if the reply pending bit is set on a glock, then it will select the maximum length of time for the min-hold time, rather than looking at gl_tstamp. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* GFS2: Fix debugfs glock file iteratorSteven Whitehouse2008-08-131-5/+6
| | | | | | | | Due to an incorrect iterator, some glocks were being missed from the glock dumps obtained via debugfs. This patch fixes the problem and ensures that we don't miss any glocks in future. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Allow local DF locks when holding a cached EX glockSteven Whitehouse2008-07-071-2/+6
| | | | | | | | | | | | | | | | | We already allow local SH locks while we hold a cached EX glock, so here we allow DF locks as well. This works only because we rely on the VFS's invalidation for locally cached data, and because if we hold an EX lock, then we know that no other node can be caching data relating to this file. It dramatically speeds up initial writes to O_DIRECT files since we fall back to buffered I/O for this and would otherwise bounce between DF and EX modes on each and every write call. The lessons to be learned from that are to ensure that (for the time being anyway) O_DIRECT files are preallocated and that they are written to using reasonably large I/O sizes. Even so this change fixes that corner case nicely Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Fix delayed demote raceSteven Whitehouse2008-07-071-1/+4
| | | | | | | | | | There is a race in the delayed demote code where it does the wrong thing if a demotion to UN has occurred for other reasons before the delay has expired. This patch adds an assert to catch that condition as well as fixing the root cause by adding an additional check for the UN state. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Bob Peterson <rpeterso@redhat.com>
* [GFS2] Remove remote lock dropping codeSteven Whitehouse2008-06-271-9/+3
| | | | | | | | | | | | | | | | | | | There are several reasons why this is undesirable: 1. It never happens during normal operation anyway 2. If it does happen it causes performance to be very, very poor 3. It isn't likely to solve the original problem (memory shortage on remote DLM node) it was supposed to solve 4. It uses a bunch of arbitrary constants which are unlikely to be correct for any particular situation and for which the tuning seems to be a black art. 5. In an N node cluster, only 1/N of the dropped locked will actually contribute to solving the problem on average. So all in all we are better off without it. This also makes merging the lock_dlm module into GFS2 a bit easier. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] No lock_nolockSteven Whitehouse2008-06-271-3/+12
| | | | | | | | | | | | | This patch merges the lock_nolock module into GFS2 itself. As well as removing some of the overhead of the module, it also means that its now impossible to build GFS2 without a lock module (which would be a pointless thing to do anyway). We also plan to merge lock_dlm into GFS2 in the future, but that is a more tricky task, and will therefore be a separate patch. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: David Teigland <teigland@redhat.com>
* [GFS2] Clean up the glock coreSteven Whitehouse2008-06-271-967/+644
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch implements a number of cleanups to the core of the GFS2 glock code. As a result a lot of code is removed. It looks like a really big change, but actually a large part of this patch is either removing or moving existing code. There are some new bits too though, such as the new run_queue() function which is considerably streamlined. Highlights of this patch include: o Fixes a cluster coherency bug during SH -> EX lock conversions o Removes the "glmutex" code in favour of a single bit lock o Removes the ->go_xmote_bh() for inodes since it was duplicating ->go_lock() o We now only use the ->lm_lock() function for both locks and unlocks (i.e. unlock is a lock with target mode LM_ST_UNLOCKED) o The fast path is considerably shortly, giving performance gains especially with lock_nolock o The glock_workqueue is now used for all the callbacks from the DLM which allows us to simplify the lock_dlm module (see following patch) o The way is now open to make further changes such as eliminating the two threads (gfs2_glockd and gfs2_scand) in favour of a more efficient scheme. This patch has undergone extensive testing with various test suites so it should be pretty stable by now. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Bob Peterson <rpeterso@redhat.com>
* [GFS2] Invalidate cache at correct pointBenjamin Marzinski2008-03-311-14/+21
| | | | | | | | | | | | | | | | GFS2 wasn't invalidating its cache before it called into the lock manager with a request that could potentially drop a lock. This was leaving a window where the lock could be actually be held by another node, but the file's page cache would still appear valid, causing coherency problems. This patch moves the cache invalidation to before the lock manager call when dropping a lock. It also adds the option to the lock_dlm lock manager to not use conversion mode deadlock avoidance, which, on a conversion from shared to exclusive, could internally drop the lock, and then reacquire in. GFS2 now asks lock_dlm to not do this. Instead, GFS2 manually drops the lock and reacquires it. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Fix bug where we called drop_bh incorrectlySteven Whitehouse2008-03-311-14/+1
| | | | | | | | | | As a result of an earlier patch, drop_bh was being called in cases when it shouldn't have been. Since we never have a gh in the drop case and we always have a gh in the promote case, we can use that extra information to tell which case has been seen. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Bob Peterson <rpeterso@redhat.com>
* [GFS2] Remove rgrp and glock version numbersBob Peterson2008-03-311-2/+1
| | | | | | | | | This patch further reduces GFS2's memory requirements by eliminating the 64-bit version number fields in lieu of a couple bits. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Remove lm.[ch] and distribute contentSteven Whitehouse2008-03-311-4/+47
| | | | | | | | | | | | | | | | | The functions in lm.c were just wrappers which were mostly only used in one other file. By moving the functions to the files where they are being used, they can be marked static and also this will usually result in them being inlined since they are often only used from one point in the code. A couple of really trivial functions have been inlined by hand into the function which called them as it makes the code clearer to do that. We also gain from one fewer function call in the glock lock and unlock paths. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Eliminate gl_req_bhBob Peterson2008-03-311-56/+51
| | | | | | | | This patch further reduces the memory needs of GFS2 by eliminating the gl_req_bh variable from struct gfs2_glock. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Get rid of gl_waiters2Bob Peterson2008-03-311-3/+4
| | | | | | | | This patch reduces memory by replacing the int variable gl_waiters2 by a single bit in the gl_flags. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] make gfs2_glock_hold() staticAdrian Bunk2008-03-311-1/+1
| | | | | | | gfs2_glock_hold() can now become static. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Only wake the reclaim daemon if we need toBob Peterson2008-03-311-4/+4
| | | | | | | | This patch only wakes up the glock reclaim daemon if there is actually something to be reclaimed. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* gfs2: make gfs2_glock.gl_owner_pid be a struct pid *Pavel Emelyanov2008-02-071-7/+12
| | | | | | | | | | | | | | The gl_owner_pid field is used to get the lock owning task by its pid, so make it in a proper manner, i.e. by using the struct pid pointer and pid_task() function. The pid_task() becomes exported for the gfs2 module. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* gfs2: make gfs2_holder.gh_owner_pid be a struct pid *Pavel Emelyanov2008-02-071-7/+11
| | | | | | | | | | | | The gl_owner_pid field is used to get the holder task by its pid and check whether the current is a holder, so make it in a proper manner, i.e. via the struct pid * manipulations. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [GFS2] Reorganize function gfs2_glmutex_lockBob Peterson2008-01-251-14/+9
| | | | | | | | | | | | This patch optimizes the function gfs2_glmutex_lock. The basic theory is: Why bother initializing a holder, setting up wait bits and then waiting on them, if you know the glock can be yours. So the holder stuff is placed inside the if checking if the glock is locked. This one needs careful scrutiny because changing anything to do with locking should strike terror into one's heart. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Fix runtime issue with UP kernelsFabio Massimo Di Nitto2008-01-251-3/+0
| | | | | | | | | | | | | | | | | | The issue is indeed UP vs SMP and it is totally random. spin_is_locked() is a bad assertion because there is no correct answer on UP. on UP spin_is_locked() has to return either one value or another, always. This means that in my setup I am lucky enough to trigger the issue and your you are lucky enough not to. the patch in attachment removes the bogus calls to BUG_ON and according to David (in CC and thanks for the long explanation on the problem) we can rely upon things like lockdep to find problem that might be trying to catch. Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Don't add glocks to the journalSteven Whitehouse2008-01-251-3/+0
| | | | | | | | | | | The only reason for adding glocks to the journal was to keep track of which locks required a log flush prior to release. We add a flag to the glock to allow this check to be made in a simpler way. This reduces the size of a glock (by 12 bytes on i386, 24 on x86_64) and means that we can avoid extra work during the journal flush. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Remove flags no longer requiredSteven Whitehouse2008-01-251-15/+2
| | | | | | | | | | | | | | | The HIF_MUTEX and HIF_PROMOTE flags were set on the glock holders depending upon which of the two waiters lists they were going to be queued upon. They were then tested when the holders were taken off the lists to ensure that the right type of holder was being dequeued. Since we are already using separate lists, there doesn't seem a lot of point having these flags as well, and since setting them and testing them is in the fast path for locking and unlocking glock, this patch removes them. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Reorder writeback for glock syncSteven Whitehouse2008-01-251-7/+6
| | | | | | | | | | | | | | | Previously we were doing (write data, wait for data, write metadata, wait for metadata). After this patch we so (write metadata, write data, wait for data, wait for metadata) which should be more efficient. Also I noticed that the drop_bh and xmote_bh functions were almost identical. In fact the only difference was a single test, and that test is such that in the drop_bh case, it would always evaluate to the correct result. As such we can use the xmote_bh functions in all the places where we were using the drop_bh function and remove the drop_bh functions. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Remove "reclaim limit"Steven Whitehouse2008-01-251-9/+0
| | | | | | | | | This call to reclaim glocks is not needed, and in particular we don't want it in the fast path for locking glocks. The limit was entirely arbitrary anyway and we can't expect users to adjust things like this, the remaining code will do the right thing on its own. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Handle multiple glock demote requestsWendy Cheng2008-01-251-1/+14
| | | | | | | | | | | Fix a race condition where multiple glock demote requests are sent to a node back-to-back. This patch does a check inside handle_callback() to see whether a demote request is in progress. If true, it sets a flag to make sure run_queue() will loop again to handle the new request, instead of erronously setting gl_demote_state to a different state. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Move inode deletion out of blocking_cbWendy Cheng2007-10-101-5/+1
| | | | | | | | | Move inode deletion code out of blocking_cb handle_callback route to avoid racy conditions that end up blocking lock_dlm1 thread. Fix bugzilla 286821. Signed-off-by: Wendy Cheng <wcheng@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] flocks from same process trip kernel BUG at fs/gfs2/glock.c:1118!Abhijith Das2007-10-101-18/+25
| | | | | | | | | | | | | | | | This patch adds a new flag to the gfs2_holder structure GL_FLOCK. It is set on holders of glocks representing flocks. This flag is checked in add_to_queue() and a process is permitted to queue more than one holder onto a glock if it is set. This solves the issue of a process not being able to do multiple flocks on the same file. Through a single descriptor, a process can now promote and demote flocks. Through multiple descriptors a process can now queue multiple flocks on the same file. There's still the problem of a process deadlocking itself (because gfs2 blocking locks are not interruptible) by queueing incompatible deadlock. Signed-off-by: Abhijith Das <adas@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] delay glock demote for a minimum hold timeBenjamin Marzinski2007-10-101-16/+59
| | | | | | | | | | | | | | | | | | | | | | When a lot of IO, with some distributed mmap IO, is run on a GFS2 filesystem in a cluster, it will deadlock. The reason is that do_no_page() will repeatedly call gfs2_sharewrite_nopage(), because each node keeps giving up the glock too early, and is forced to call unmap_mapping_range(). This bumps the mapping->truncate_count sequence count, forcing do_no_page() to retry. This patch institutes a minimum glock hold time a tenth a second. This insures that even in heavy contention cases, the node has enough time to get some useful work done before it gives up the glock. A second issue is that when gfs2_glock_dq() is called from within a page fault to demote a lock, and the associated page needs to be written out, it will try to acqire a lock on it, but it has already been locked at a higher level. This patch puts makes gfs2_glock_dq() use the work queue as well, to avoid this issue. This is the same patch as Steve Whitehouse originally proposed to fix this issue, execpt that gfs2_glock_dq() now grabs a reference to the glock before it queues up the work on it. Signed-off-by: Benjamin E. Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Wendy's dump lockname in hex & fix glock dumpAbhijith Das2007-10-101-13/+13
| | | | | | | | | | With this patch, gfs2 glockdump through the debugfs filesystem will only dump glocks for the specified filesystem instead of all glocks. Also, to aid debugging, the glock number is dumped in hex instead of decimal. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Signed-off-by: Abhijith Das <adas@redhat.com>
* [GFS2] Reduce number of gfs2_scand processes to oneSteven Whitehouse2007-10-101-15/+48
| | | | | | | | | We only need a single gfs2_scand process rather than the one per filesystem which we had previously. As a result the parameter determining the frequency of gfs2_scand runs becomes a module parameter rather than a mount parameter as it was before. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] mark struct *_operations constDenis Cheng2007-10-101-1/+1
| | | | | | | these struct *_operations are all method tables, thus should be const. Signed-off-by: Denis Cheng <crquan@gmail.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Fix an oops in glock dumpingSteven Whitehouse2007-10-101-38/+35
| | | | | | | | | This fixes an oops which was occurring during glock dumping due to the seq file code not taking a reference to the glock. Also this fixes a memory leak which occurred in certain cases, in turn preventing the filesystem from unmounting. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Clean up duplicate includes in fs/gfs2/Jesper Juhl2007-10-101-2/+0
| | | | | | | | This patch cleans up duplicate includes in fs/gfs2/ Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Fix calculation of demote stateJosef Whiter2007-10-101-2/+3
| | | | | | | | | | If a glock is in the exclusive state and a request for demote to deferred has been received, then further requests for demote to shared are being ignored. This patch fixes that by ensuring that we demote to unlocked in that case. Signed-off-by: Josef Whiter <jwhiter@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Fix two races relating to glock callbacksSteven Whitehouse2007-10-101-6/+18
| | | | | | | | | | | | | One of the races relates to referencing a variable while not holding its protecting spinlock. The patch simply moves the test inside the spin lock. The other races occurs when a demote to unlocked request occurs during the time a demote to shared request is already running. This of course only happens in the case that the lock was in the exclusive mode to start with. The patch adds a check to see if another demote request has occurred in the mean time and if it has, then it performs a second demote. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Simplify multiple glock aquisitionSteven Whitehouse2007-07-091-51/+13
| | | | | | | | | | | | | | | | | | There is a bug in the code which acquires multiple glocks where if the initial out-of-order attempt fails part way though we can land up trying to acquire the wrong number of glocks. This is part of the fix for red hat bz #239737. The other part of the bz doesn't apply to upstream kernels since it was fixed by: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d3717bdf8f08a0e1039158c8bab2c24d20f492b6 Since the out-of-order code doesn't appear to add anything to the performance of GFS2, this patch just removed it rather than trying to fix it. It should be much easier to see whats going on here now. In addition, we don't allocate any memory unless we are using a lot of glocks (which is a relatively uncommon case). Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Fix deallocation issuesAbhijith Das2007-07-091-11/+41
| | | | | | | | | | | | | | | | | | | | | There were two issues during deallocation of unlinked inodes. The first was relating to the use of a "try" lock which in the case of the inode lock wasn't trying hard enough to deallocate in all circumstances (now changed to a normal glock) and in the case of the iopen lock didn't wait for the demotion of the shared lock before attempting to get the exclusive lock, and thereby sometimes (timing dependent) not completing the deallocation when it should have done. The second issue related to the lack of a way to invalidate dcache entries on remote nodes (now fixed by this patch) which meant that unlinks were taking a long time to return disk space to the fs. By adding some code to invalidate the dcache entries across the cluster for unlinked inodes, that is now fixed. This patch was written jointly by Abhijith Das and Steven Whitehouse. Signed-off-by: Abhijith Das <adas@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Clean up inode number handlingSteven Whitehouse2007-07-091-2/+2
| | | | | | | | | | | | | | | | | | | | | | | This patch cleans up the inode number handling code. The main difference is that instead of looking up the inodes using a struct gfs2_inum_host we now use just the no_addr member of this structure. The tests relating to no_formal_ino can then be done by the calling code. This has advantages in that we want to do different things in different code paths if the no_formal_ino doesn't match. In the NFS patch we want to return -ESTALE, but in the ->lookup() path, its a bug in the fs if the no_formal_ino doesn't match and thus we can withdraw in this case. In order to later fix bz #201012, we need to be able to look up an inode without knowing no_formal_ino, as the only information that is known to us is the on-disk location of the inode in question. This patch will also help us to fix bz #236099 at a later date by cleaning up a lot of the code in that area. There are no user visible changes as a result of this patch and there are no changes to the on-disk format either. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Addendum patch 2 for gfs2_growRobert Peterson2007-07-091-3/+4
| | | | | | | | | | | | | | | | | | | This addendum patch 2 corrects three things: 1. It fixes a stupid mistake in the previous addendum that broke gfs2. Ref: https://www.redhat.com/archives/cluster-devel/2007-May/msg00162.html 2. It fixes a problem that Dave Teigland pointed out regarding the external declarations in ops_address.h being in the wrong place. 3. It recasts a couple more %llu printks to (unsigned long long) as requested by Steve Whitehouse. I would have loved to put this all in one revised patch, but there was a rush to get some patches for RHEL5. Therefore, the previous patches were applied to the git tree "as is" and therefore, I'm posting another addendum. Sorry. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [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>
* [GFS2] lockdump improvementsRobert Peterson2007-05-011-8/+18
| | | | | | | | | | | | | | | | | | | | | | 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>
* [GFS2] bz 236008: Kernel gpf doing cat /debugfs/gfs2/xxx (lock dump)Robert Peterson2007-05-011-8/+21
| | | | | | | | | | | | This is for Bugzilla Bug 236008: Kernel gpf doing cat /debugfs/gfs2/xxx (lock dump) seen at the "gfs2 summit". This also fixes the bug that caused garbage to be printed by the "initialized at" field. I apologize for the kludge, but that code will all be ripped out anyway when the official sprint_symbol function becomes available in the Linux kernel. I also changed some formatting so that spaces are replaced by proper tabs. Signed-off-by: Robert Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [GFS2] Red Hat bz 228540: owner referencesRobert Peterson2007-05-011-19/+56
| | | | | | | | | | | | | | | | | | | | | | | | | | | In Testing the previously posted and accepted patch for https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=228540 I uncovered some gfs2 badness. It turns out that the current gfs2 code saves off a process pointer when glocks is taken in both the glock and glock holder structures. Those structures will persist in memory long after the process has ended; pointers to poisoned memory. This problem isn't caused by the 228540 fix; the new capability introduced by the fix just uncovered the problem. I wrote this patch that avoids saving process pointers and instead saves off the process pid. Rather than referencing the bad pointers, it now does process lookups. There is special code that makes the output nicer for printing holder information for processes that have ended. This patch also adds a stub for the new "sprint_symbol" function that exists in Andrew Morton's -mm patch set, but won't go into the base kernel until 2.6.22, since it adds functionality but doesn't fix a bug. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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