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  1. 25 Jan, 2008 9 commits
    • Steven Whitehouse's avatar
      [GFS2] Add writepages for GFS2 jdata · b8e7cbb6
      Steven Whitehouse authored 
      This patch resolves a lock ordering issue where we had been getting
a transaction lock in the wrong order with respect to the page lock.
By using writepages rather than just writepage, it is then possible
to start a transaction before locking the page, and thus matching the
locking order elsewhere in the code.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      b8e7cbb6
    • Steven Whitehouse's avatar
      [GFS2] Split gfs2_writepage into three cases · 9ff8ec32
      Steven Whitehouse authored 
      This patch splits gfs2_writepage into separate functions for each of
the three cases: writeback, ordered and journalled. As a result
it becomes a lot easier to see what each one is doing. The common
code is moved into gfs2_writepage_common.

This fixes a performance bug where we were doing more work than
strictly required in the ordered write case.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      9ff8ec32
    • Steven Whitehouse's avatar
      [GFS2] Introduce gfs2_set_aops() · 5561093e
      Steven Whitehouse authored 
      Just like ext3 we now have three sets of address space operations
to cover the cases of writeback, ordered and journalled data
writes. This means that the individual operations can now become
less complicated as we are able to remove some of the tests for
file data mode from the code.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      5561093e
    • Steven Whitehouse's avatar
      [GFS2] Add gfs2_is_writeback() · bf36a713
      Steven Whitehouse authored 
      This adds a function "gfs2_is_writeback()" along the lines of the
existing "gfs2_is_jdata()" in order to clean up the code and make
the various tests for the inode mode more obvious. It also fixes
the PageChecked() logic where we were resetting the flag too early
in the case of an error path.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      bf36a713
    • Steven Whitehouse's avatar
      [GFS2] Remove unused field in struct gfs2_inode · e7e36f14
      Steven Whitehouse authored 
      Removes a field that is not used.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      e7e36f14
    • Steven Whitehouse's avatar
      [GFS2] Remove useless i_cache from inodes · f91a0d3e
      Steven Whitehouse authored 
      The i_cache was designed to keep references to the indirect blocks
used during block mapping so that they didn't have to be looked
up continually. The idea failed because there are too many places
where the i_cache needs to be freed, and this has in the past been
the cause of many bugs.

In addition there was no performance benefit being gained since the
disk blocks in question were cached anyway. So this patch removes
it in order to simplify the code to prepare for other changes which
would otherwise have had to add further support for this feature.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      f91a0d3e
    • Steven Whitehouse's avatar
      [GFS2] Use ->page_mkwrite() for mmap() · 3cc3f710
      Steven Whitehouse authored 
      This cleans up the mmap() code path for GFS2 by implementing the
page_mkwrite function for GFS2. We are thus able to use the
generic filemap_fault function for our ->fault() implementation.

This now means that shared writable mappings will be much more
efficiently shared across the cluster if there is a reasonable
proportion of read activity (the greater proportion, the better).

As a side effect, it also reduces the size of the code, removes
special cases from readpage and readpages, and makes the code
path easier to follow.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      3cc3f710
    • Steven Whitehouse's avatar
      [GFS2] Clean up internal read function · 51ff87bd
      Steven Whitehouse authored 
      As requested by Christoph, this patch cleans up GFS2's internal
read function so that it no longer uses the do_generic_mapping_read
function. This function is obsolete and GFS2 is the last user of it.

As a side effect the internal read code gets smaller and easier
to read and gfs2_readpage is split into two. One function has the locking
and the other function has the rest of the logic.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
      51ff87bd
    • Wendy Cheng's avatar
      [GFS2] Handle multiple glock demote requests · cc7e79b1
      Wendy Cheng authored 
      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: default avatarS. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      cc7e79b1
  3. 24 Jan, 2008 31 commits
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