Commit Graph

168 Commits (aa405b1f4238401616e7d98620170b424b2dbefc)

Author SHA1 Message Date
Steven Whitehouse 90101c3186 [GFS2] Compile fix for glock.c
This one liner got missed from the previous patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:35 -05:00
Steven Whitehouse 12132933c4 [GFS2] Remove queue_empty() function
This function is not longer required since we do not do recursive
locking in the glock layer. As a result all its callers can be
replaceed with list_empty() calls.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:32 -05:00
Steven Whitehouse b5d32bead1 [GFS2] Tidy up glops calls
This patch doesn't make any changes to the ordering of the various
operations related to glocking, but it does tidy up the calls to the
glops.c functions to make the structure more obvious.

The two functions: gfs2_glock_xmote_th() and gfs2_glock_drop_th() can be
made static within glock.c since they are called by every set of glock
operations. The xmote_th and drop_th glock operations are then made
conditional upon those two routines existing and called from the
previously mentioned functions in glock.c respectively.

Also it can be seen that the go_sync operation isn't needed since it can
easily be replaced by calls to xmote_bh and drop_bh respectively. This
results in no longer (confusingly) calling back into routines in glock.c
from glops.c and also reducing the glock operations by one member.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:26 -05:00
Steven Whitehouse 1c0f4872dc [GFS2] Remove local exclusive glock mode
Here is a patch for GFS2 to remove the local exclusive flag. In
the places it was used, mutex's are always held earlier in the
call path, so it appears redundant in the LM_ST_SHARED case.

Also, the GFS2 holders were setting local exclusive in any case where
the requested lock was LM_ST_EXCLUSIVE. So the other places in the glock
code where the flag was tested have been replaced with tests for the
lock state being LM_ST_EXCLUSIVE in order to ensure the logic is the
same as before (i.e. LM_ST_EXCLUSIVE is always locally exclusive as well
as globally exclusive).

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:20 -05:00
Steven Whitehouse 6bd9c8c2fb [GFS2] Remove unused go_callback operation
This is never used, so we might as well remove it.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:17 -05:00
Steven Whitehouse e5dab552c8 [GFS2] Remove the "greedy" function from glock.[ch]
The "greedy" code was an attempt to retain glocks for a minimum length
of time when they relate to mmap()ed files. The current implementation
of this feature is not, however, ideal in that it required allocating
memory in order to do this and its overly complicated.

It also misses the mark by ignoring the other I/O operations which are
just as likely to suffer from the same problem. So the plan is to remove
this now and then add the functionality back as part of the glock state
machine at a later date (and thus take into account all the possible
users of this feature)

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:14 -05:00
Steven Whitehouse fee852e374 [GFS2] Shrink gfs2_inode memory by half
Here is something I spotted (while looking for something entirely
different) the other day.

Rather than using a completion in each and every struct gfs2_holder,
this removes it in favour of hashed wait queues, thus saving a
considerable amount of memory both on the stack (where a number of
gfs2_holder structures are allocated) and in particular in the
gfs2_inode which has 8 gfs2_holder structures embedded within it.

As a result on x86_64 the gfs2_inode shrinks from 2488 bytes to
1912 bytes, a saving of 576 bytes per inode (no thats not a typo!).
In actual practice we get a much better result than that since
now that a gfs2_inode is under the 2048 byte barrier, we get two
per 4k slab page effectively halving the amount of memory required
to store gfs2_inodes.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:11 -05:00
Steven Whitehouse 3699e3a44b [GFS2] Clean up/speed up readdir
This removes the extra filldir callback which gfs2 was using to
enclose an attempt at readahead for inodes during readdir. The
code was too complicated and also hurts performance badly in the
case that the getdents64/readdir call isn't being followed by
stat() and it wasn't even getting it right all the time when it
was.

As a result, on my test box an "ls" of a directory containing 250000
files fell from about 7mins (freshly mounted, so nothing cached) to
between about 15 to 25 seconds. When the directory content was cached,
the time taken fell from about 3mins to about 4 or 5 seconds.

Interestingly in the cached case, running "ls -l" once reduced the time
taken for subsequent runs of "ls" to about 6 secs even without this
patch. Now it turns out that there was a special case of glocks being
used for prefetching the metadata, but because of the timeouts for these
locks (set to 10 secs) the metadata was being timed out before it was
being used and this the prefetch code was constantly trying to prefetch
the same data over and over.

Calling "ls -l" meant that the inodes were brought into memory and once
the inodes are cached, the glocks are not disposed of until the inodes
are pushed out of the cache, thus extending the lifetime of the glocks,
and thus bringing down the time for subsequent runs of "ls"
considerably.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:37:04 -05:00
Linus Torvalds 1c1afa3c05 Merge master.kernel.org:/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw
* master.kernel.org:/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw: (73 commits)
  [DLM] Clean up lowcomms
  [GFS2] Change gfs2_fsync() to use write_inode_now()
  [GFS2] Fix indent in recovery.c
  [GFS2] Don't flush everything on fdatasync
  [GFS2] Add a comment about reading the super block
  [GFS2] Mount problem with the GFS2 code
  [GFS2] Remove gfs2_check_acl()
  [DLM] fix format warnings in rcom.c and recoverd.c
  [GFS2] lock function parameter
  [DLM] don't accept replies to old recovery messages
  [DLM] fix size of STATUS_REPLY message
  [GFS2] fs/gfs2/log.c:log_bmap() fix printk format warning
  [DLM] fix add_requestqueue checking nodes list
  [GFS2] Fix recursive locking in gfs2_getattr
  [GFS2] Fix recursive locking in gfs2_permission
  [GFS2] Reduce number of arguments to meta_io.c:getbuf()
  [GFS2] Move gfs2_meta_syncfs() into log.c
  [GFS2] Fix journal flush problem
  [GFS2] mark_inode_dirty after write to stuffed file
  [GFS2] Fix glock ordering on inode creation
  ...
2006-12-07 09:13:20 -08:00
Randy Dunlap 0ac230699a [GFS2] lock function parameter
Fix function parameter typing:
fs/gfs2/glock.c💯 warning: function declaration isn't a prototype

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-11-30 10:37:18 -05:00
Steven Whitehouse b004157ab5 [GFS2] Fix journal flush problem
This fixes a bug which resulted in poor performance due to flushing
the journal too often. The code path in question was via the inode_go_sync()
function in glops.c. The solution is not to flush the journal immediately
when inodes are ejected from memory, but batch up the work for glockd to
deal with later on. This means that glocks may now live on beyond the end of
the lifetime of their inodes (but not very much longer in the normal case).

Also fixed in this patch is a bug (which was hidden by the bug mentioned above) in
calculation of the number of free journal blocks.

The gfs2_logd process has been altered to be more responsive to the journal
filling up. We now wake it up when the number of uncommitted journal blocks
has reached the threshold level rather than trying to flush directly at the
end of each transaction. This again means doing fewer, but larger, log
flushes in general.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-11-30 10:36:42 -05:00
Steven Whitehouse 1a14d3a68f [GFS2] Simplify glops functions
The go_sync callback took two flags, but one of them was set on every
call, so this patch removes once of the flags and makes the previously
conditional operations (on this flag), unconditional.

The go_inval callback took three flags, each of which was set on every
call to it. This patch removes the flags and makes the operations
unconditional, which makes the logic rather more obvious.

Two now unused flags are also removed from incore.h.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-11-30 10:36:30 -05:00
Steven Whitehouse ab923031ce [GFS2] Fix memory allocation in glock.c
Change from GFP_KERNEL to GFP_NOFS as this was causing a
slow down when trying to push inodes from cache.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-11-30 10:35:46 -05:00
Steven Whitehouse c594d88664 [GFS2] Remove unused GL_DUMP flag
There is no way to set the GL_DUMP flag, and in any case the
same thing can be done with systemtap if required for debugging,
so this removes it.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-11-30 10:34:40 -05:00
Steven Whitehouse b60623c238 [GFS2] Shrink gfs2_inode (3) - di_mode
This removes the duplicate di_mode field in favour of using the
inode->i_mode field. This saves 4 bytes.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-11-30 10:34:14 -05:00
David Howells c4028958b6 WorkStruct: make allyesconfig
Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
2006-11-22 14:57:56 +00:00
Steven Whitehouse 907b9bceb4 [GFS2/DLM] Fix trailing whitespace
As per Andrew Morton's request, removed trailing whitespace.

Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-25 09:26:04 -04:00
Fabio Massimo Di Nitto 7d308590ae [GFS2] Export lm_interface to kernel headers
lm_interface.h has a few out of the tree clients such as GFS1
and userland tools.

Right now, these clients keeps a copy of the file in their build tree
that can go out of sync.

Move lm_interface.h to include/linux, export it to userland and
clean up fs/gfs2 to use the new location.

Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-19 08:45:18 -04:00
Steven Whitehouse a8336344a5 [GFS2] Fix glock hash clearing
A one liner bug fix to prevent the return value being
wrong when more than one superblock is mounted.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-14 13:57:38 -04:00
Steven Whitehouse 16feb9fec0 [GFS2] Use atomic_t rather than kref in glock.c
Use atomic_t as the ref count in glocks rather than a kref.
This is another step towards using RCU for the glock hash.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-13 10:43:37 -04:00
Steven Whitehouse b6397893a5 [GFS2] Use hlist for glock hash chains
This results in smaller list heads, so that we can have more chains
in the same amount of memory (twice as many). I've multiplied the
size of the table by four though - this is because we are saving
memory by not having one lock per chain any more. So we land up
using about the same amount of memory for the hash table as we
did before I started these changes, the difference being that we
now have four times as many hash chains.

The reason that I say "about the same amount of memory" is that the
actual amount now depends upon the NR_CPUS and some of the config
variables, so that its not exact and in some cases we do use more
memory. Eventually we might want to scale the hash table size
according to the size of physical ram as measured on module load.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-12 10:10:01 -04:00
Steven Whitehouse 2426443460 [GFS2] Rewrite of examine_bucket()
The existing implementation of this function in glock.c was not
very efficient as it relied upon keeping a cursor element upon the
hash chain in question and moving it along. This new version improves
upon this by using the current element as a cursor. This is possible
since we only look at the "next" element in the list after we've
taken the read_lock() subsequent to calling the examiner function.
Obviously we have to eventually drop the ref count that we are then
left with and we cannot do that while holding the read_lock, so we
do that next time we drop the lock. That means either just before
we examine another glock, or when the loop has terminated.

The new implementation has several advantages: it uses only a
read_lock() rather than a write_lock(), so it can run simnultaneously
with other code, it doesn't need a "plug" element, so that it removes
a test not only from this list iterator, but from all the other glock
list iterators too. So it makes things faster and smaller.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-11 21:40:30 -04:00
Steven Whitehouse 94610610f1 [GFS2] Remove unused function from glock.c
The callback for iopen locks is unused, so this removes
it.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-09 18:59:27 -04:00
Steven Whitehouse a5e08a9ef5 [GFS2] Add consts to glock sorting function
Add back the consts which were casted away in the glock sorting
function. Also add early exit code.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-09 17:07:05 -04:00
Steven Whitehouse 087efdd391 [GFS2] Make glock hash locks proportional to NR_CPUS
Make the number of locks used for hash chains in glock.c
proportional to NR_CPUS. Also move constants for the number
of hash chains into glock.c from incore.h since they are
not used outside of glock.c.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-09 16:59:11 -04:00
Steven Whitehouse 37b2fa6a24 [GFS2] Move rwlocks in glock.c into their own array
This splits the rwlocks guarding the hash chains of the glock hash
table into their own array. This will reduce memory usage in some
cases due to better alignment, although the real reason for doing it
is to allow the two tables to be different sizes in future (i.e.
the locks will be sized proportionally with the max number of CPUs
and the hash chains sized proportinally with the size of physical memory)

In order to allow this, the gl_bucket member of struct gfs2_glock has
now become gl_hash, so we record the hash rather than a pointer to the
bucket itself.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-08 13:35:56 -04:00
Steven Whitehouse 9b47c11d1c [GFS2] Use void * instead of typedef for locking module interface
As requested by Jan Engelhardt, this removes the typedefs in the
locking module interface and replaces them with void *. Also
since we are changing the interface, I've added a few consts
as well.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-08 10:17:58 -04:00
Steven Whitehouse 1c089c325d [GFS2] Remove one typedef
This removes one of the typedefs from the locking interface. It
is replaced by a forward declaration of the gfs2 superblock. The
other two are not so easy to solve since in their case, they
can refer to one of two possible structures.

Cc: David Teigland <teigland@redhat.com>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-07 15:50:20 -04:00
Steven Whitehouse 85d1da67f7 [GFS2] Move glock hash table out of superblock
There are several reasons why we want to do this:
 - Firstly its large and thus we'll scale better with multiple
   GFS2 fs mounted at the same time
 - Secondly its easier to scale its size as required (thats a plan
   for later patches)
 - Thirdly, we can use kzalloc rather than vmalloc when allocating
   the superblock (its now only 4888 bytes)
 - Fourth its all part of my plan to eventually be able to use RCU
   with the glock hash.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-07 14:40:21 -04:00
Steven Whitehouse b8547856f9 [GFS2] Add gfs2 superblock to glock hash function
This is another patch preparing for sharing of the glock hash
table between different gfs2 mounts.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-07 13:12:27 -04:00
Steven Whitehouse cd915493fc [GFS2] Change all types to uX style
This makes all fixed size types have consistent names.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-04 12:49:07 -04:00
Steven Whitehouse a91ea69ffd [GFS2] Align all labels against LH side
This makes everything consistent.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-04 12:04:26 -04:00
Steven Whitehouse 5029996547 [GFS2] Tidy up locking code
As per Jan Engelhardt's second email, this removes some unused code,
and fixes up indenting in various places.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-04 09:49:55 -04:00
Steven Whitehouse e9fc2aa091 [GFS2] Update copyright, tidy up incore.h
As per comments from Jan Engelhardt <jengelh@linux01.gwdg.de> this
updates the copyright message to say "version" in full rather than
"v.2". Also incore.h has been updated to remove forward structure
declarations which are not required.

The gfs2_quota_lvb structure has now had endianess annotations added
to it. Also quota.c has been updated so that we now store the
lvb data locally in endian independant format to avoid needing
a structure in host endianess too. As a result the endianess
conversions are done as required at various points and thus the
conversion routines in lvb.[ch] are no longer required. I've
moved the one remaining constant in lvb.h thats used into lm.h
and removed the unused lvb.[ch].

I have not changed the HIF_ constants. That is left to a later patch
which I hope will unify the gh_flags and gh_iflags fields of the
struct gfs2_holder.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-01 11:05:15 -04:00
Steven Whitehouse 899be4d3b7 [GFS2] Add superblock into key for glock lookups
This adds the superblock as a key for glock lookups. Since the glocks
are already stored in a per-superblock table, this has no effect at
the moment. Later on this will change though.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-30 12:50:28 -04:00
Steven Whitehouse d6a5372768 [GFS2] Use const on glock lookup key
Use const for the glock name which is being used as a lookup key
in the glock hash table.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-30 11:16:23 -04:00
Steven Whitehouse ec45d9f583 [GFS2] Use slab properly with glocks
We can take advantage of the slab allocator to ensure that all the list
heads and the spinlock (plus one or two other fields) are initialised
by slab to speed up allocation of glocks.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-30 10:36:52 -04:00
Steven Whitehouse 5e2b0613ed [GFS2] Remove unused code from glock layer
Remove the unused sync feature from glocks. This is currently done by
calling the required functions to sync pages/blocks directly so this
code isn't needed.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-30 09:38:30 -04:00
Steven Whitehouse 8fb4b536e7 [GFS2] Make glock operations const
For all the usual reasons of enforcing correctness and potentially
reducing code size, this patch makes the glock operations const.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-30 09:30:00 -04:00
Abhijith Das 8638460540 [GFS2] Allow mounting of gfs2 and gfs2meta at the same time
This patch allows the simultaneous mounting of gfs2meta and gfs2
filesystems. A restriction however is that a gfs2meta fs may only be
mounted if its corresponding gfs2 filesystem is also mounted. Also, a
gfs2 filesystem cannot be unmounted before its gfs2meta filesystem.

Signed-off-by: Abhijith Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-25 17:19:55 -04:00
Steven Whitehouse a2242db090 [GFS2] Speed up scanning of glocks
I noticed the gfs2_scand seemed to be taking a lot of CPU,
so in order to cut that down a bit, here is a patch. Firstly
the type of a glock is a constant during its lifetime, so that
its possible to check this without needing locking. I've moved
the (common) case of testing for an inode glock outside of
the glmutex lock.

Also there was a mutex left over from when the glock cache was
master of the inode cache. That isn't required any more so I've
removed that too.

There is probably scope for further speed ups in the future
in this area.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-24 17:03:05 -04:00
Russell Cattelan 8872187780 [GFS2] Fix a couple of refcount leaks.
recovery.c add a brelse to deal with gfs2_replay_read_block being called
twice on the same block.

add a dput to drop the ref count on the root inode.
This was causing lingering glocks and thus causing
a mount failure to hang.

Fix a endian conversion macro that was was swizzling
16bits when it should have been swizzling 32.

Signed-off-by: Russell Cattelan <cattelan@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-08-10 17:18:59 -04:00
Steven Whitehouse 5dd9feafb3 [GFS2] Fix bug in clear_inode
We should have been waiting for lock demotion to finish in
clear_inode.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-07-28 14:52:33 -04:00
Steven Whitehouse f45b7ddd2b [GFS2] Use a bio to read the superblock
This means that we don't need to create a special inode just to contain
a struct address_space in order to read a single disk block. Instead
we read the disk block directly. Its slightly faster, and uses slightly
less memory, but the real reason for doing this is that it removes a
special case from the glock code.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-07-27 13:53:53 -04:00
Steven Whitehouse 29937ac6ca [GFS2] Fixes to scanning of glocks (again)
This really is the correct fix this time. We just ignore all
glocks associated with inodes until the inodes are pushed
from the inode cache. At that point the glocks are queued for
reclaim, so we don't need to do it here.

Also fix one or two other minor bugs.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-07-06 17:58:03 -04:00
Steven Whitehouse 627add2d13 [GFS2] Correct logic in glock scanner
Under certain circumstances the glock scanning logic would
demote locks which ought not to have been selected for
demotion.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-07-05 13:16:19 -04:00
Steven Whitehouse af18ddb886 [GFS2] Eliminate one instance of __GFP_NOFAIL
This removes one instance of GFP_NOFAIL from the glock callback
function. It also fixes a bug where a , was used at a line end
rather than ; causing unintended results.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-06-24 15:42:21 -04:00
Steven Whitehouse feaa7bba02 [GFS2] Fix unlinked file handling
This patch fixes the way we have been dealing with unlinked,
but still open files. It removes all limits (other than memory
for inodes, as per every other filesystem) on numbers of these
which we can support on GFS2. It also means that (like other
fs) its the responsibility of the last process to close the file
to deallocate the storage, rather than the person who did the
unlinking. Note that with GFS2, those two events might take place
on different nodes.

Also there are a number of other changes:

 o We use the Linux inode subsystem as it was intended to be
used, wrt allocating GFS2 inodes
 o The Linux inode cache is now the point which we use for
local enforcement of only holding one copy of the inode in
core at once (previous to this we used the glock layer).
 o We no longer use the unlinked "special" file. We just ignore it
completely. This makes unlinking more efficient.
 o We now use the 4th block allocation state. The previously unused
state is used to track unlinked but still open inodes.
 o gfs2_inoded is no longer needed
 o Several fields are now no longer needed (and removed) from the in
core struct gfs2_inode
 o Several fields are no longer needed (and removed) from the in core
superblock

There are a number of future possible optimisations and clean ups
which have been made possible by this patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-06-14 15:32:57 -04:00
Steven Whitehouse 382066da25 [GFS2] Casts for printing 64bit numbers
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-05-24 10:22:09 -04:00
Steven Whitehouse 320dd101e2 [GFS2] glock debugging and inode cache changes
This adds some extra debugging to glock.c and changes
inode.c's deallocation code to call the debugging code
at a suitable moment. I'm chasing down a particular bug
to do with deallocation at the moment and the code can
go again once the bug is fixed.

Also this includes the first part of some changes to unify
the Linux struct inode and GFS2's struct gfs2_inode. This
transformation will happen in small parts over the next short
period.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-05-18 16:25:27 -04:00
Steven Whitehouse 3a8a9a1034 [GFS2] Update copyright date to 2006
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-05-18 15:09:15 -04:00
Steven Whitehouse bd8968010a [GFS2] Remove semaphore.h from C files
We no longer use semaphores, everything has been converted to
mutex or rwsem, so we don't need to include this header any more.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-05-18 14:54:58 -04:00
Steven Whitehouse fd88de569b [GFS2] Readpages support
This adds readpages support (and also corrects a small bug in
the readpage error path at the same time). Hopefully this will
improve performance by allowing GFS to submit larger lumps of
I/O at a time.

In order to simplify the setting of BH_Boundary, it currently gets
set when we hit the end of a indirect pointer block. There is
always a boundary at this point with the current allocation code.
It doesn't get all the boundaries right though, so there is still
room for improvement in this.

See comments in fs/gfs2/ops_address.c for further information about
readpages with GFS2.

Signed-off-by: Steven Whitehouse
2006-05-05 16:59:11 -04:00
Steven Whitehouse 56409abbf8 [GFS2] Remove some unused code
Remove some of the unused code flagged up by Adrian Bunk.

Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steven Whitehouse
2006-04-28 11:48:45 -04:00
Adrian Bunk 08bc2dbc73 [GFS2] [-mm patch] fs/gfs2/: possible cleanups
This patch contains the following possible cleanups:
- make needlessly global code static
- #if 0 unused functions
- remove the following global function that was both unused and
  unimplemented:
  - super.c: gfs2_do_upgrade()

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-04-28 10:59:12 -04:00
Steven Whitehouse 363275216c [GFS2] Reordering in deallocation to avoid recursive locking
Despite my earlier careful search, there was a recursive lock left
in the deallocation code. This removes it. It also should speed up
deallocation be reducing the number of locking operations which take
place by using two "try lock" operations on the two locks involved in
inode deallocation which allows us to grab the locks out of order
(compared with NFS which grabs the inode lock first and the iopen
lock later). It is ok for us to fail while doing this since if it
does fail it means that someone else is still using the inode and
thus it wouldn't be possible to deallocate anyway.

This fixes the bug reported to me by Rob Kenna.

Cc: Rob Kenna <rkenna@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-04-28 10:46:21 -04:00
David Teigland e7f5c01cad [GFS2] Remove redundant casts to/from void
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-04-27 11:25:45 -04:00
Steven Whitehouse 579b78a43b [GFS2] Remove GL_NEVER_RECURSE flag
There is no point in keeping this flag since recursion is not
now allowed for any glock.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-04-26 14:58:26 -04:00
Steven Whitehouse 5965b1f479 [GFS2] Don't do recursive locking in glock layer
This patch changes the last user of recursive locking so that
it no longer needs this feature and removes it from the glock
layer. This makes the glock code a lot simpler and easier to
understand. Its also a prerequsite to adding support for the
AOP_TRUNCATED_PAGE return code (or at least it is if you don't
want your brain to melt in the process)

I've left in a couple of checks just in case there is some place
else in the code which is still using this feature that I didn't
spot yet, but they can probably be removed long term.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-04-26 13:21:55 -04:00
Steven Whitehouse 190562bd84 [GFS2] Fix a bug: scheduling under a spinlock
At some stage, a mutex was added to gfs2_glock_put() without
checking all its call sites. Two of them were called from
under a spinlock causing random delays at various points and
crashes.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-04-20 16:57:23 -04:00
Steven Whitehouse fe1bdedc6c [GFS2] Use vmalloc() in dir code
When allocating memory to sort directory entries, use vmalloc()
rather than kmalloc() since for larger directories, the required
size can easily be graeter than the 128k maximum of kmalloc().

Also adding the first steps towards getting the AOP_TRUNCATED_PAGE
return code get in the glock code by flagging all places where we
request a glock and we are holding a page lock.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-04-18 10:09:15 -04:00
Steven Whitehouse d0dc80dbaf [GFS2] Update debugging code
Update the debugging code in trans.c and at the same time improve
the debugging code for gfs2_holders. The new code should be pretty
fast during the normal case and provide just as much information
in case of errors (or more).

One small function from glock.c has moved to glock.h as a static inline so
that its return address won't get in the way of the debugging.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-03-29 14:36:49 -05:00
Steven Whitehouse 5c676f6d35 [GFS2] Macros removal in gfs2.h
As suggested by Pekka Enberg <penberg@cs.helsinki.fi>.

The DIV_RU macro is renamed DIV_ROUND_UP and and moved to kernel.h
The other macros are gone from gfs2.h as (although not requested
by Pekka Enberg) are a number of included header file which are now
included individually. The inode number comparison function is
now an inline function.

The DT2IF and IF2DT may be addressed in a future patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-27 17:23:27 -05:00
Steven Whitehouse d92a8d4808 [GFS2] Audit printk and kmalloc
All printk calls now have KERN_ set where required and a couple of
kmalloc(), memset(.., 0, ...) calls changed to kzalloc().

This is in response to comments from:
Pekka Enberg <penberg@cs.helsinki.fi> and
Eric Sesterhenn <snakebyte@gmx.de>

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-27 10:57:14 -05:00
David Teigland d95cb943f5 [GFS2] Patch to remove stats counters from GFS2 (II)
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-23 10:13:13 +00:00
David Teigland 6a6b3d018f [GFS2] Patch to remove stats gathering from GFS2
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-23 10:11:47 +00:00
Steven Whitehouse f55ab26a8f [GFS2] Use mutices rather than semaphores
As well as a number of minor bug fixes, this patch changes GFS
to use mutices rather than semaphores. This results in better
information in case there are any locking problems.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-21 12:51:39 +00:00
David Teigland b3b94faa5f [GFS2] The core of GFS2
This patch contains all the core files for GFS2.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00