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[GFS2] Use ->page_mkwrite() for mmap()

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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: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
2007-10-15 15:40:33 +01:00
parent 51ff87bdd9
commit 3cc3f710ce
7 changed files with 131 additions and 251 deletions
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9
fs/gfs2/glops.c
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@ -86,15 +86,10 @@ static void gfs2_pte_inval(struct gfs2_glock *gl)
if (!ip || !S_ISREG(inode->i_mode))
return;
if (!test_bit(GIF_PAGED, &ip->i_flags))
return;
unmap_shared_mapping_range(inode->i_mapping, 0, 0);
if (test_bit(GIF_SW_PAGED, &ip->i_flags))
set_bit(GLF_DIRTY, &gl->gl_flags);
clear_bit(GIF_SW_PAGED, &ip->i_flags);
}
/**
@ -234,10 +229,8 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
set_bit(GIF_INVALID, &ip->i_flags);
}
if (ip && S_ISREG(ip->i_inode.i_mode)) {
if (ip && S_ISREG(ip->i_inode.i_mode))
truncate_inode_pages(ip->i_inode.i_mapping, 0);
clear_bit(GIF_PAGED, &ip->i_flags);
}
}
/**