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* NSM: Move nsm_find() to fs/lockd/mon.cChuck Lever2009-01-06
| | | | | | | | | | | | | | | | | | | | | | The nsm_find() function sets up fresh nsm_handle entries. This is where we will store the "priv" cookie used to lookup nsm_handles during reboot recovery. The cookie will be constructed when nsm_find() creates a new nsm_handle. As much as possible, I would like to keep everything that handles a "priv" cookie in fs/lockd/mon.c so that all the smarts are in one source file. That organization should make it pretty simple to see how all this works. To me, it makes more sense than the current arrangement to keep nsm_find() with nsm_monitor() and nsm_unmonitor(). So, start reorganizing by moving nsm_find() into fs/lockd/mon.c. The nsm_release() function comes along too, since it shares the nsm_lock global variable. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: move to xdr_stream-based XDR encoders and decodersChuck Lever2009-01-06
| | | | | | | | Introduce xdr_stream-based XDR encoder and decoder functions, which are more careful about preventing RPC buffer overflows. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Move NSM program and procedure numbers to fs/lockd/mon.cChuck Lever2009-01-06
| | | | | | | | | | | | | | | Clean up: Move the RPC program and procedure numbers for NSM into the one source file that needs them: fs/lockd/mon.c. And, as with NLM, NFS, and rpcbind calls, use NSMPROC_FOO instead of SM_FOO for NSM procedure numbers. Finally, make a couple of comments more precise: what is referred to here as SM_NOTIFY is really the NLM (lockd) NLMPROC_SM_NOTIFY downcall, not NSMPROC_NOTIFY. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Move NSM-related XDR data structures to lockd's xdr.hChuck Lever2009-01-06
| | | | | | | | Clean up: NSM's XDR data structures are used only in fs/lockd/mon.c, so move them there. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Check result of SM_UNMON upcallChuck Lever2009-01-06
| | | | | | | | | | | Make sure any error returned by rpc.statd during an SM_UNMON call is reported rather than ignored completely. There isn't much to do with such an error, but we should log it in any case. Similar to a recent change to nsm_monitor(). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NLM: Move the public declaration of nsm_unmonitor() to lockd.hChuck Lever2009-01-06
| | | | | | | | | | | | | Clean up. Make the nlm_host argument "const," and move the public declaration to lockd.h. Add a documenting comment. Bruce observed that nsm_unmonitor()'s only caller doesn't care about its return code, so make nsm_unmonitor() return void. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Release nsmhandle in nlm_destroy_hostChuck Lever2009-01-06
| | | | | | | | | | | | | | | | | | | | | | | The nsm_handle's reference count is bumped in nlm_lookup_host(). It should be decremented in nlm_destroy_host() to make it easier to see the balance of these two operations. Move the nsm_release() call to fs/lockd/host.c. The h_nsmhandle pointer is set in nlm_lookup_host(), and never cleared. The nlm_destroy_host() function is never called for the same nlm_host twice, so h_nsmhandle won't ever be NULL when nsm_unmonitor() is called. All references to the nlm_host are gone before it is freed. We can skip making h_nsmhandle NULL just before the nlm_host is deallocated. It's also likely we can remove the h_nsmhandle NULL check in nlmsvc_is_client() as well, but we can do that later when rearchitect- ing the nlm_host cache. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NLM: Move the public declaration of nsm_monitor() to lockd.hChuck Lever2009-01-06
| | | | | | | | | | | | | Clean up. Make the nlm_host argument "const," and move the public declaration to lockd.h with other NSM public function (nsm_release, eg) and global variable declarations. Add a documenting comment. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Make sure to return an error if the SM_MON call result is not zeroChuck Lever2009-01-06
| | | | | | | | | | | | | | | | | | | | | | | The nsm_monitor() function reports an error and does not set sm_monitored if the SM_MON upcall reply has a non-zero result code, but nsm_monitor() does not return an error to its caller in this case. Since sm_monitored is not set, the upcall is retried when the next NLM request invokes nsm_monitor(). However, that may not come for a while. In the meantime, at least one NLM request will potentially proceed without the peer being monitored properly. Have nsm_monitor() return an error if the result code is non-zero. This will cause all NLM requests to fail immediately if the upcall completed successfully but rpc.statd returned an error. This may be inconvenient in some cases (for example if rpc.statd cannot complete a proper DNS reverse lookup of the hostname), but will make the reboot monitoring service more robust by forcing such issues to be corrected by an admin. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Remove BUG_ON() in nsm_monitor()Chuck Lever2009-01-06
| | | | | | | | | Clean up: Remove the BUG_ON() invocation in nsm_monitor(). It's not likely that nsm_monitor() is ever called with a NULL host pointer, and the code will die anyway if host is NULL. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NLM: Remove redundant printk() in nlmclnt_lock()Chuck Lever2009-01-06
| | | | | | | | | The nsm_monitor() function already generates a printk(KERN_NOTICE) if the SM_MON upcall fails, so the similar printk() in the nlmclnt_lock() function is redundant. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Use sm_name instead of h_name in nsm_monitor() and nsm_unmonitor()Chuck Lever2009-01-06
| | | | | | | | | | Clean up: Use the sm_name field for reporting the hostname in nsm_monitor() and nsm_unmonitor(), just as the other functions in fs/lockd/mon.c do. The h_name field is just a copy of the sm_name pointer. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Support IPv6 version of mon_nameChuck Lever2009-01-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The "mon_name" argument of the NSMPROC_MON and NSMPROC_UNMON upcalls is a string that contains the hostname or IP address of the remote peer to be notified when this host has rebooted. The sm-notify command uses this identifier to contact the peer when we reboot, so it must be either a well-qualified DNS hostname or a presentation format IP address string. When the "nsm_use_hostnames" sysctl is set to zero, the kernel's NSM provides a presentation format IP address in the "mon_name" argument. Otherwise, the "caller_name" argument from NLM requests is used, which is usually just the DNS hostname of the peer. To support IPv6 addresses for the mon_name argument, we use the nsm_handle's address eye-catcher, which already contains an appropriate presentation format address string. Using the eye-catcher string obviates the need to use a large buffer on the stack to form the presentation address string for the upcall. This patch also addresses a subtle bug. An NSMPROC_MON request and the subsequent NSMPROC_UNMON request for the same peer are required to use the same value for the "mon_name" argument. Otherwise, rpc.statd's NSMPROC_UNMON processing cannot locate the database entry for that peer and remove it. If the setting of nsm_use_hostnames is changed between the time the kernel sends an NSMPROC_MON request and the time it sends the NSMPROC_UNMON request for the same peer, the "mon_name" argument for these two requests may not be the same. This is because the value of "mon_name" is currently chosen at the moment the call is made based on the setting of nsm_use_hostnames To ensure both requests pass identical contents in the "mon_name" argument, we now select which string to use for the argument in the nsm_monitor() function. A pointer to this string is saved in the nsm_handle so it can be used for a subsequent NSMPROC_UNMON upcall. NB: There are other potential problems, such as how nlm_host_rebooted() might behave if nsm_use_hostnames were changed while hosts are still being monitored. This patch does not attempt to address those problems. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: convert printk(KERN_DEBUG) to a dprintk()Chuck Lever2009-01-06
| | | | | | | | | Clean up: make the printk(KERN_DEBUG) in nsm_mon_unmon() a dprintk, and add another dprintk to note if creating an RPC client for the upcall failed. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NSM: Use C99 structure initializer to initialize nsm_argsChuck Lever2009-01-06
| | | | | | | | Clean up: Use a C99 structure initializer instead of open-coding the initialization of nsm_args. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NLM: Add helper to handle IPv4 addressesChuck Lever2009-01-06
| | | | | | | | Clean up: introduce a helper function to generate IPv4 addresses using the same style as the IPv6 helper function we just added. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NLM: Support IPv6 scope IDs in nlm_display_address()Chuck Lever2009-01-06
| | | | | | | | | | | | | Scope ID support is needed since the kernel's NSM implementation is about to use these displayed addresses as a mon_name in some cases. When nsm_use_hostnames is zero, without scope ID support NSM will fail to handle peers that contact us via a link-local address. Link-local addresses do not work without an interface ID, which is stored in the sockaddr's sin6_scope_id field. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NLM: Remove AF_UNSPEC arm in nlm_display_address()Chuck Lever2009-01-06
| | | | | | | | | AF_UNSPEC support is no longer needed in nlm_display_address() now that a presentation address is no longer generated for the h_srcaddr field. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* NLM: Remove address eye-catcher buffers from nlm_hostChuck Lever2009-01-06
| | | | | | | | | | | | | | | | The h_name field in struct nlm_host is a just copy of h_nsmhandle->sm_name. Likewise, the contents of the h_addrbuf field should be identical to the sm_addrbuf field. The h_srcaddrbuf field is used only in one place for debugging. We can live without this until we get %pI formatting for printk(). Currently these buffers are 48 bytes, but we need to support scope IDs in IPv6 presentation addresses, which means making the buffers even larger. Instead, let's find ways to eliminate them to save space. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* lockd: set svc_serv->sv_maxconn to a more reasonable value (try #3)Jeff Layton2009-01-06
| | | | | | | | | | | | | | | The default method for calculating the number of connections allowed per RPC service arbitrarily limits single-threaded services to 80 connections. This is too low for services like lockd and artificially limits the number of TCP clients that it can support. Have lockd set a default sv_maxconn value to 1024 (which is the typical default value for RLIMIT_NOFILE. Also add a module parameter to allow an admin to set this to an arbitrary value. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* nfsd: Fix leaked memory in nfs4_make_rec_clidnameKrishna Kumar2009-01-06
| | | | | | | cksum.data is not freed up in one error case. Compile tested. Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* nfsd: Minor cleanup of find_stateidKrishna Kumar2009-01-06
| | | | | | | Minor cleanup/rewrite of find_stateid. Compile tested. Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* nfsd: update fh_verify descriptionJ. Bruce Fields2009-01-06
| | | | Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
* Merge branch 'for-linus' of ↵Linus Torvalds2009-01-05
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm: dlm: fs/dlm/ast.c: fix warning dlm: add new debugfs entry dlm: add time stamp of blocking callback dlm: change lock time stamping dlm: improve how bast mode handling dlm: remove extra blocking callback check dlm: replace schedule with cond_resched dlm: remove kmap/kunmap dlm: trivial annotation of be16 value dlm: fix up memory allocation flags
| * dlm: fs/dlm/ast.c: fix warningAndrew Morton2008-12-23
| | | | | | | | | | | | | | | | | | | | fs/dlm/ast.c: In function 'dlm_astd': fs/dlm/ast.c:64: warning: 'bastmode' may be used uninitialized in this function Cleans code up. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: add new debugfs entryDavid Teigland2008-12-23
| | | | | | | | | | | | | | | | | | The new debugfs entry dumps all rsb and lkb structures, and includes a lot more information than has been available before. This includes the new timestamps added by a previous patch for debugging callback issues. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: add time stamp of blocking callbackDavid Teigland2008-12-23
| | | | | | | | | | | | | | | | Record the time the latest blocking callback was queued for a lock. This will be used for debugging in combination with lock queue timestamp changes in the previous patch. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: change lock time stampingDavid Teigland2008-12-23
| | | | | | | | | | | | | | | | | | Use ktime instead of jiffies for timestamping lkb's. Also stamp the time on every lkb whenever it's added to a resource queue, instead of just stamping locks subject to timeouts. This will allow us to use timestamps more widely for debugging all locks. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: improve how bast mode handlingDavid Teigland2008-12-23
| | | | | | | | | | | | | | | | | | | | | | The lkb bastmode value is set in the context of processing the lock, and read by the dlm_astd thread. Because it's accessed in these two separate contexts, the writing/reading ought to be done under a lock. This is simple to do by setting it and reading it when the lkb is added to and removed from dlm_astd's callback list which is properly locked. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: remove extra blocking callback checkDavid Teigland2008-12-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Just before delivering a blocking callback (bast), the dlm_astd thread checks again that the granted mode of the lkb actually blocks the mode requested by the bast. The idea behind this was originally that the granted mode may have changed since the bast was queued, making the callback now unnecessary. Reasons for removing this extra check are: - dlm_astd doesn't lock the rsb before reading the lkb grmode, so it's not technically safe (this removes the long standing FIXME) - after running some tests, it doesn't appear the check ever actually eliminates a bast - delivering an unnecessary blocking callback isn't a bad thing and can happen anyway Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: replace schedule with cond_reschedSteven Whitehouse2008-12-23
| | | | | | | | | | | | | | | | | | | | This is a one-liner to use cond_resched() rather than schedule() in the ast delivery loop. It should not be necessary to schedule every time, so this will save some cpu time while continuing to allow scheduling when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: remove kmap/kunmapSteven Whitehouse2008-12-23
| | | | | | | | | | | | | | | | The pages used in lowcomms are not highmem, so kmap is not necessary. Cc: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: trivial annotation of be16 valueHarvey Harrison2008-12-23
| | | | | | | | | | | | | | | | | | fs/dlm/dir.c:419:14: warning: incorrect type in assignment (different base types) fs/dlm/dir.c:419:14: expected unsigned short [unsigned] [addressable] [assigned] [usertype] be_namelen fs/dlm/dir.c:419:14: got restricted __be16 [usertype] <noident> Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: fix up memory allocation flagsSteven Whitehouse2008-12-23
| | | | | | | | | | | | | | | | | | | | | | Use ls_allocation for memory allocations, which a cluster fs sets to GFP_NOFS. Use GFP_NOFS for allocations when no lockspace struct is available. Taking dlm locks needs to avoid calling back into the cluster fs because write-out can require taking dlm locks. Cc: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmwLinus Torvalds2009-01-05
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw: (27 commits) GFS2: Use DEFINE_SPINLOCK GFS2: Fix use-after-free bug on umount (try #2) Revert "GFS2: Fix use-after-free bug on umount" GFS2: Streamline alloc calculations for writes GFS2: Send useful information with uevent messages GFS2: Fix use-after-free bug on umount GFS2: Remove ancient, unused code GFS2: Move four functions from super.c GFS2: Fix bug in gfs2_lock_fs_check_clean() GFS2: Send some sensible sysfs stuff GFS2: Kill two daemons with one patch GFS2: Move gfs2_recoverd into recovery.c GFS2: Fix "truncate in progress" hang GFS2: Clean up & move gfs2_quotad GFS2: Add more detail to debugfs glock dumps GFS2: Banish struct gfs2_rgrpd_host GFS2: Move rg_free from gfs2_rgrpd_host to gfs2_rgrpd GFS2: Move rg_igeneration into struct gfs2_rgrpd GFS2: Banish struct gfs2_dinode_host GFS2: Move i_size from gfs2_dinode_host and rename it to i_disksize ...
| * | GFS2: Use DEFINE_SPINLOCKJulia Lawall2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | GFS2: Fix use-after-free bug on umount (try #2)Steven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | This should solve the issue with the previous attempt at fixing this. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | Revert "GFS2: Fix use-after-free bug on umount"Steven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: Streamline alloc calculations for writesSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch removes some unused code, and make the calculation of the number of blocks required conditional in order to reduce the number of times this (potentially expensive) calculation is done. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | GFS2: Send useful information with uevent messagesSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In order to distinguish between two differing uevent messages and to avoid using the (racy) method of reading status from sysfs in future, this adds some status information to our uevent messages. Btw, before anybody says "sysfs isn't racy", I'm aware of that, but the way that GFS2 was using it (send an ambiugous uevent and then expect the receiver to read sysfs to find out the status of the reported operation) was. The additional benefit of using the new interface is that it should be possible for a node to recover multiple journals at the same time, since there is no longer any confusion as to which journal the status belongs to. At some future stage, when all the userland programs have been converted, I intend to remove the old interface. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | GFS2: Fix use-after-free bug on umountSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: Remove ancient, unused codeSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | Remove code that used to have something to do with initrd but has been unused for a long time. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | GFS2: Move four functions from super.cSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: Fix bug in gfs2_lock_fs_check_clean()Steven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | gfs2_lock_fs_check_clean() should not be calling gfs2_jindex_hold() since it doesn't work like rindex hold, despite the comment. That allows gfs2_jindex_hold() to be moved into ops_fstype.c where it can be made static. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | GFS2: Send some sensible sysfs stuffSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | We ought to inform the user of the locktable and lockproto for each uevent we generate. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | GFS2: Kill two daemons with one patchSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: Move gfs2_recoverd into recovery.cSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | By moving gfs2_recoverd, we can make an additional function static and it also leaves only (the already scheduled for removal) gfs2_glockd in daemon.c. At the same time the declaration of gfs2_quotad is moved to quota.h to reflect the new location of gfs2_quotad in a previous patch. Also the recovery.h and quota.h headers are cleaned up. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | GFS2: Fix "truncate in progress" hangSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: Clean up & move gfs2_quotadSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch is a clean up of gfs2_quotad prior to giving it an extra job to do in addition to the current portfolio of updating the quota and statfs information from time to time. As a result it has been moved into quota.c allowing one of the functions it calls to be made static. Also the clean up allows the two existing functions to have separate timeouts and also to coexist with its future role of dealing with the "truncate in progress" inode flag. The (pointless) setting of gfs2_quotad_secs is removed since we arrange to only wake up quotad when one of the two timers expires. In addition the struct gfs2_quota_data is moved into a slab cache, mainly for easier debugging. It should also be possible to use a shrinker in the future, rather than the current scheme of scanning the quota data entries from time to time. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
| * | GFS2: Add more detail to debugfs glock dumpsSteven Whitehouse2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Although the glock dumps print quite a lot of information about the glocks themselves, there are more things which can be usefully added to the dump realting to the objects themselves. This patch adds a few more fields to the inode and resource group lines, which should be useful for debugging. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-23 13:50:35 -0500