On (19/04/07 09:35), Christoph Lameter didst pronounce:
> Variable Order Page Cache: Fixup fallback functions
>
> Fixup the fallback function in fs/libfs.c to be able to handle
> higher order page cache pages.
>
> Signed-off-by: Christoph Lameter <[email protected]>
>
> ---
> fs/libfs.c | 16 ++++++++++------
> 1 file changed, 10 insertions(+), 6 deletions(-)
>
> Index: linux-2.6.21-rc7/fs/libfs.c
> ===================================================================
> --- linux-2.6.21-rc7.orig/fs/libfs.c 2007-04-18 21:52:49.000000000 -0700
> +++ linux-2.6.21-rc7/fs/libfs.c 2007-04-18 21:54:51.000000000 -0700
> @@ -320,8 +320,8 @@ int simple_rename(struct inode *old_dir,
>
> int simple_readpage(struct file *file, struct page *page)
> {
> - clear_highpage(page);
> - flush_dcache_page(page);
> + clear_mapping_page(file->f_mapping, page);
> + flush_mapping_page(file->f_mapping, page);
right, I think it would be easier to read if patches 3 and 4 were
merged. Personal preference, feel free to ignore
> SetPageUptodate(page);
> unlock_page(page);
> return 0;
> @@ -331,11 +331,15 @@ int simple_prepare_write(struct file *fi
> unsigned from, unsigned to)
> {
> if (!PageUptodate(page)) {
> - if (to - from != PAGE_CACHE_SIZE) {
> + if (to - from != page_cache_size(file->f_mapping)) {
> + /*
> + * Mapping to higher order pages need to be supported
> + * if higher order pages can be in highmem
> + */
comments about missing page_cache_size() covered elsewhere. However, I
note that Dave Kleikamp might be interested in this changing of
page_cache_size() from the perspective of page cache tails. I've added
him to the cc so he can take a quick look.
> void *kaddr = kmap_atomic(page, KM_USER0);
> memset(kaddr, 0, from);
> - memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
> - flush_dcache_page(page);
> + memset(kaddr + to, 0, page_cache_size(file->f_mapping) - to);
> + flush_mapping_page(file->f_mapping, page);
> kunmap_atomic(kaddr, KM_USER0);
> }
> }
> @@ -346,7 +350,7 @@ int simple_commit_write(struct file *fil
> unsigned from, unsigned to)
> {
> struct inode *inode = page->mapping->host;
> - loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
> + loff_t pos = ((loff_t)page->index << page_cache_shift(file->f_mapping)) + to;
>
> if (!PageUptodate(page))
> SetPageUptodate(page);
> -
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--
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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