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  1. 25 Jan, 2008 4 commits
    • 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 This function is obsolete and GFS2 is the last user of it.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 32 commits
  5. 23 Jan, 2008 4 commits
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