On Wed, 2007-10-17 at 15:40 +0200, Peter Zijlstra wrote:
> I noticed that ->writepage() didn't actually do anything since it
> doesn't generate a write request for the given page.
>
> The below is an attempt at fixing it, and it works for me. Although I'm
> not quite sure its the proper fix.
>
> Signed-off-by: Peter Zijlstra <[email protected]>
> ---
> fs/nfs/write.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> Index: linux-2.6/fs/nfs/write.c
> ===================================================================
> --- linux-2.6.orig/fs/nfs/write.c
> +++ linux-2.6/fs/nfs/write.c
> @@ -332,10 +332,30 @@ static int nfs_page_async_flush(struct n
> static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
> {
> struct inode *inode = page_file_mapping(page)->host;
> + struct rpc_cred *cred;
> + struct nfs_open_context *ctx;
> + int status;
>
> nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
> nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
>
> + cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
> + if (IS_ERR(cred))
> + return PTR_ERR(cred);
> +
> + ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
> + if (!ctx)
> + return -EBADF;
> +
> + status = nfs_writepage_setup(ctx, page, 0, nfs_page_length(page));
> +
> + put_nfs_open_context(ctx);
> +
> + if (status < 0) {
> + nfs_set_pageerror(page);
> + return status;
> + }
> +
> nfs_pageio_cond_complete(pgio, page_file_index(page));
> return nfs_page_async_flush(pgio, page);
> }
NACK. writepage()'s job is simply to start writeout on the page.
nfs_vm_page_mkwrite(), and nfs_commit_write() actually set up the
nfs_page structure before we ever get to writepage().
Cheers
Trond
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