This should clarify the logic in gfs2_releasepage() relating to
error handling as well as making the response to errors a bit
more graceful.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Another case where list_del should be list_del_init.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

A list_del should have been a list_del_init in lops.c which was
resulting in incorrect status returns from list_empty().
Signed-off-by: NSteven Whitheouse <swhiteho@redhat.com>

This fixes a memory leak of struct gfs2_bufdata and also some
problems in the ordered write handling code. It needs a bit
more testing, but I believe that the reference counting of
ordered write buffers should now be correct.

This is aimed at fixing Red Hat bugzilla: #201028 and #201082
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

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: NRussell Cattelan <cattelan@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

In some cases we can enter write page without there being buffers
attached to the page. In this case the function to add gfs2_bufdata
to the buffers fails sliently causing further failures down the
stack.

This fix ensures that we always add buffers in writepage if they
didn't already exist (mmap is one way to trigger this).
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

The previous patch didn't change all the gfs_ to gfs2_ so
this is the remainder.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

When the result of a posix lock request is read it needs to be matched up
with the correct waiting request.  The owner field needs to be used in the
comparison since more than one process may be waiting for locks on the
same file.
Signed-off-by: NDavid Teigland <teigland@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Use the gfs2_ prefix on the register/unregister functions for the lock
modules.  The gfs_ prefix was left from an old idea on how to share these
with gfs1.
Signed-off-by: NDavid Teigland <teigland@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Mmapped files were able to trigger a lock ordering bug. Private
maps do not need to take the glock so early on. Shared maps do
unfortunately, however we can get around that by adding a flag
into the flags for the struct gfs2_file. This only works because
we are taking an exclusive lock at this point, so we know that
nobody else can be racing with us.

Fixes Red Hat bugzilla: #201196
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

This was a nasty bug which resulted in corruption of hash tables
in the directory code with larger directories. We forgot to
increment a pointer in the read/write routines internal to the
directory code.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

We need to use fl_owner instead of fl_pid to track the owner of a posix
lock.  Pass the owner value out to user space where cluster plocks are
managed.
Signed-off-by: NDavid Teigland <teigland@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Tidy up some files and remove an unused routine in meta_io.h. Also
added a bit of extra debugging in meta_io.h.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

We should have been waiting for lock demotion to finish in
clear_inode.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

This gets the argument to submit_bio() correct.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Some allocations in rgrp.c should have been GFP_NOFS
rather than GFP_KERNEL.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

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: NSteven Whitehouse <swhiteho@redhat.com>

The remaining routines in page.c were all only used in one other
file, so they are now moved into the files where they are referenced
and made static. Thus page.[ch] are no longer required.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Tidy up gfs2_unstuffer_page by:

 a) Moving it into bmap.c
 b) Making it static
 c) Calling it directly from gfs2_unstuff_dinode
 d) Updating all callers of gfs2_unstuff_dinode due to one less
    required argument.

It doesn't change the behaviour at all.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

As per comments received, alter the GFS2 direct I/O path so that
it uses the standard read functions "out of the box". Needs a
small change to one of the VFS functions. This reduces the size
of the code quite a lot and also removes the need for one new export.

Some more work remains to be done, but this is the bones of the
thing.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

traced the "umount hang due to spurious glock" issue that I was having
with gfs2meta. It's in the do_gfs2_set_flags function, which does a
gfs2_holder_init as well as a gfs2_glock_nq_init (increases ref count by
2 instead of 1).
Signed-off-by: NAbhijith Das <adas@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Typo causes the error value from the wrong lock to be checked.
Signed-off-by: NDavid Teigland <teigland@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Fix an endian coversion bug in log.c spotted by Kevin Anderson.

Cc: Kevin Anderson <kanderso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Fix a use after free bug in dir.c spotted by Kevin Anderson.

Cc: Kevin Anderson <kanderso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Update the NFS filehandles so that they contain the file type.
Signed-off-by: NWendy Cheng <wcheng@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Fix a couple of compiler warnings in dir.c caused by
potentially uninitialised variables.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

A missing initialisation when creating a new on disk inode.
Signed-off-by: NAbhijith Das <adas@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

We must not call GFP_KERNEL memory allocations while we
are holding the log lock (read or write) since that may
trigger a log flush resulting in a deadlock.

Eventually we need to fix the locking in log.c, for now
this solves the problem at the expense of freeing up memory
as fast as we would like to. This needs to be revisited
later on.

Cc: Kevin Anderson <kanderso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

This adds a generation number for the eventual use of NFS to the
ondisk inode. Its backward compatible with the current code since
it doesn't really matter what the generation number is to start with,
and indeed since its set to zero, due to it being taken from padding
in both the inode and rgrp header, it should be fine.

The eventual plan is to use this rather than no_formal_ino in the
NFS filehandles. At that point no_formal_ino will be unused.

At the same time we also add a releasepages call back to the
"normal" address space for gfs2 inodes. Also I've removed a
one-linrer function thats not required any more.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

This fixes a bug where we were releasing a page incorrectly
sometimes when reading a stuffed file. This fixes the bug
that Kevin reported when using Xen.

Cc: Kevin Anderson <kanderso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Remove a couple of commented out, and unused lines of
code.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

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: NSteven Whitehouse <swhiteho@redhat.com>

Under certain circumstances the glock scanning logic would
demote locks which ought not to have been selected for
demotion.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Cast a uint64_t to unsigned long long for a printk.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Change our one existing old-style lock initialiser to a new-style
one. This allows the lock validator to work as intended.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

We need to hold i_mutex when doing direct i/o reads.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

As per Arjan's patches:
http://www.kernel.org/git/?p=linux/kernel/git/steve/gfs2-2.6.git;a=commitdiff;h=99ac48f54a91d02140c497edc31dc57d4bc5c85d
and
http://www.kernel.org/git/?p=linux/kernel/git/steve/gfs2-2.6.git;a=commitdiff;h=4b6f5d20b04dcbc3d888555522b90ba6d36c4106

make the GFS2 file_operations structures const.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

As per Christoph's patch:
http://www.kernel.org/git/?p=linux/kernel/git/steve/gfs2-2.6.git;a=commitdiff;h=f5e54d6e53a20cef45af7499e86164f0e0d16bb2

We mark struct address_space_operations const in GFS2.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

The kernel API for super_operations->statfs() has changed
so this updates GFS2 to the new API.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Update GFS2 for dhowells API changes.

Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>