On 04/16/2014 09:07 AM, Christoph Hellwig wrote:
> The write_pageio_init method is just a very convoluted way to grab the
> right nfs_pageio_ops vector. The vector to chose is not a choice of
> protocol version, but just a pNFS vs MDS I/O choice that can simply be
> done inside nfs_pageio_init_write based on the presence of a layout
> driver, and a new force_mds flag to the special case of falling back
> to MDS I/O on a pNFS-capable volume.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Tested-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
> ---
> fs/nfs/direct.c | 4 ++--
> fs/nfs/internal.h | 2 +-
> fs/nfs/nfs3proc.c | 1 -
> fs/nfs/nfs4proc.c | 1 -
> fs/nfs/pnfs.c | 16 +---------------
> fs/nfs/pnfs.h | 8 --------
> fs/nfs/proc.c | 1 -
> fs/nfs/write.c | 21 +++++++++++++--------
> include/linux/nfs_xdr.h | 2 --
> 9 files changed, 17 insertions(+), 39 deletions(-)
>
> diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
> index b8797ae..6a31102 100644
> --- a/fs/nfs/direct.c
> +++ b/fs/nfs/direct.c
> @@ -564,7 +564,7 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
> dreq->count = 0;
> get_dreq(dreq);
>
> - NFS_PROTO(dreq->inode)->write_pageio_init(&desc, dreq->inode, FLUSH_STABLE,
> + nfs_pageio_init_write(&desc, dreq->inode, FLUSH_STABLE, false,
> &nfs_direct_write_completion_ops);
> desc.pg_dreq = dreq;
>
> @@ -874,7 +874,7 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
> size_t requested_bytes = 0;
> unsigned long seg;
>
> - NFS_PROTO(inode)->write_pageio_init(&desc, inode, FLUSH_COND_STABLE,
> + nfs_pageio_init_write(&desc, inode, FLUSH_COND_STABLE, false,
> &nfs_direct_write_completion_ops);
> desc.pg_dreq = dreq;
> get_dreq(dreq);
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index dd8bfc2..8431083 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -422,7 +422,7 @@ int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
>
> /* write.c */
> extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
> - struct inode *inode, int ioflags,
> + struct inode *inode, int ioflags, bool force_mds,
> const struct nfs_pgio_completion_ops *compl_ops);
> extern struct nfs_write_header *nfs_writehdr_alloc(void);
> extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
> diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
> index db60149..e984880 100644
> --- a/fs/nfs/nfs3proc.c
> +++ b/fs/nfs/nfs3proc.c
> @@ -951,7 +951,6 @@ const struct nfs_rpc_ops nfs_v3_clientops = {
> .read_rpc_prepare = nfs3_proc_read_rpc_prepare,
> .read_done = nfs3_read_done,
> .write_setup = nfs3_proc_write_setup,
> - .write_pageio_init = nfs_pageio_init_write,
> .write_rpc_prepare = nfs3_proc_write_rpc_prepare,
> .write_done = nfs3_write_done,
> .commit_setup = nfs3_proc_commit_setup,
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 397be39..8da0c62 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -8437,7 +8437,6 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
> .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
> .read_done = nfs4_read_done,
> .write_setup = nfs4_proc_write_setup,
> - .write_pageio_init = pnfs_pageio_init_write,
> .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
> .write_done = nfs4_write_done,
> .commit_setup = nfs4_proc_commit_setup,
> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
> index cb53d45..9edac9f 100644
> --- a/fs/nfs/pnfs.c
> +++ b/fs/nfs/pnfs.c
> @@ -1447,20 +1447,6 @@ pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
> nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0);
> }
>
> -void
> -pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode,
> - int ioflags,
> - const struct nfs_pgio_completion_ops *compl_ops)
> -{
> - struct nfs_server *server = NFS_SERVER(inode);
> - struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
> -
> - if (ld == NULL)
> - nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
> - else
> - nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags);
> -}
> -
> bool
> pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
> struct nfs_page *req)
> @@ -1496,7 +1482,7 @@ int pnfs_write_done_resend_to_mds(struct inode *inode,
> LIST_HEAD(failed);
>
> /* Resend all requests through the MDS */
> - nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops);
> + nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, true, compl_ops);
> pgio.pg_dreq = dreq;
> while (!list_empty(head)) {
> struct nfs_page *req = nfs_list_entry(head->next);
> diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
> index 0237939..e9ac8fb 100644
> --- a/fs/nfs/pnfs.h
> +++ b/fs/nfs/pnfs.h
> @@ -182,8 +182,6 @@ void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
>
> void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *,
> const struct nfs_pgio_completion_ops *);
> -void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *,
> - int, const struct nfs_pgio_completion_ops *);
>
> void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
> void unset_pnfs_layoutdriver(struct nfs_server *);
> @@ -467,12 +465,6 @@ static inline void pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, str
> nfs_pageio_init_read(pgio, inode, compl_ops);
> }
>
> -static inline void pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags,
> - const struct nfs_pgio_completion_ops *compl_ops)
> -{
> - nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
> -}
> -
> static inline int
> pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
> struct nfs_commit_info *cinfo)
> diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
> index e55ce9e..f9cc295 100644
> --- a/fs/nfs/proc.c
> +++ b/fs/nfs/proc.c
> @@ -739,7 +739,6 @@ const struct nfs_rpc_ops nfs_v2_clientops = {
> .read_rpc_prepare = nfs_proc_read_rpc_prepare,
> .read_done = nfs_read_done,
> .write_setup = nfs_proc_write_setup,
> - .write_pageio_init = nfs_pageio_init_write,
> .write_rpc_prepare = nfs_proc_write_rpc_prepare,
> .write_done = nfs_write_done,
> .commit_setup = nfs_proc_commit_setup,
> diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> index 9a3b6a4..0bd1724 100644
> --- a/fs/nfs/write.c
> +++ b/fs/nfs/write.c
> @@ -354,10 +354,8 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc
> struct nfs_pageio_descriptor pgio;
> int err;
>
> - NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
> - page->mapping->host,
> - wb_priority(wbc),
> - &nfs_async_write_completion_ops);
> + nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc),
> + false, &nfs_async_write_completion_ops);
> err = nfs_do_writepage(page, wbc, &pgio);
> nfs_pageio_complete(&pgio);
> if (err < 0)
> @@ -400,7 +398,8 @@ int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
>
> nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
>
> - NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops);
> + nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
> + &nfs_async_write_completion_ops);
> err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
> nfs_pageio_complete(&pgio);
>
> @@ -1282,11 +1281,17 @@ static const struct nfs_pageio_ops nfs_pageio_write_ops = {
> };
>
> void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
> - struct inode *inode, int ioflags,
> + struct inode *inode, int ioflags, bool force_mds,
> const struct nfs_pgio_completion_ops *compl_ops)
> {
> - nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
> - NFS_SERVER(inode)->wsize, ioflags);
> + struct nfs_server *server = NFS_SERVER(inode);
> + const struct nfs_pageio_ops *pg_ops = &nfs_pageio_write_ops;
> +
> +#ifdef CONFIG_NFS_V4_1
> + if (server->pnfs_curr_ld && !force_mds)
> + pg_ops = server->pnfs_curr_ld->pg_write_ops;
> +#endif
> + nfs_pageio_init(pgio, inode, pg_ops, compl_ops, server->wsize, ioflags);
> }
> EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
>
> diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
> index 6fb5b23..78216f8 100644
> --- a/include/linux/nfs_xdr.h
> +++ b/include/linux/nfs_xdr.h
> @@ -1471,8 +1471,6 @@ struct nfs_rpc_ops {
> int (*read_rpc_prepare)(struct rpc_task *, struct nfs_read_data *);
> int (*read_done) (struct rpc_task *, struct nfs_read_data *);
> void (*write_setup) (struct nfs_write_data *, struct rpc_message *);
> - void (*write_pageio_init)(struct nfs_pageio_descriptor *, struct inode *, int,
> - const struct nfs_pgio_completion_ops *);
> int (*write_rpc_prepare)(struct rpc_task *, struct nfs_write_data *);
> int (*write_done) (struct rpc_task *, struct nfs_write_data *);
> void (*commit_setup) (struct nfs_commit_data *, struct rpc_message *);
--
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