[pnfs] [PATCH 03/28] pnfsblock: blocklayout stub
Benny Halevy
bhalevy at panasas.com
Wed Mar 12 12:20:34 EDT 2008
On Mar. 11, 2008, 21:31 +0200, Fred Isaman <iisaman at citi.umich.edu> wrote:
> Adds the minimal structure for a pnfs block layout driver,
> with all function pointers aimed at stubs.
>
> Signed-off-by: Fred Isaman <iisaman at citi.umich.edu>
> ---
> fs/nfs/blocklayout/Makefile | 2 +-
> fs/nfs/blocklayout/blocklayout.c | 223 ++++++++++++++++++++++++++++++++++++++
> include/linux/nfs_fs.h | 1 +
> 3 files changed, 225 insertions(+), 1 deletions(-)
> create mode 100644 fs/nfs/blocklayout/blocklayout.c
>
> diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile
> index 82275cd..6bf49cd 100644
> --- a/fs/nfs/blocklayout/Makefile
> +++ b/fs/nfs/blocklayout/Makefile
> @@ -2,4 +2,4 @@
> # Makefile for the pNFS block layout driver kernel module
> #
> obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
> -blocklayoutdriver-objs :=
> +blocklayoutdriver-objs := blocklayout.o
> diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
> new file mode 100644
> index 0000000..e4e64fc
> --- /dev/null
> +++ b/fs/nfs/blocklayout/blocklayout.c
> @@ -0,0 +1,223 @@
> +/*
> + * linux/fs/nfs/blocklayout/blocklayout.c
> + *
> + * Module for the NFSv4.1 pNFS block layout driver.
> + *
> + * Copyright (c) 2006 The Regents of the University of Michigan.
> + * All rights reserved.
> + *
> + * Andy Adamson <andros at citi.umich.edu>
> + * Fred Isaman <iisaman at umich.edu>
> + *
> + * permission is granted to use, copy, create derivative works and
> + * redistribute this software and such derivative works for any purpose,
> + * so long as the name of the university of michigan is not used in
> + * any advertising or publicity pertaining to the use or distribution
> + * of this software without specific, written prior authorization. if
> + * the above copyright notice or any other identification of the
> + * university of michigan is included in any copy of any portion of
> + * this software, then the disclaimer below must also be included.
> + *
> + * this software is provided as is, without representation from the
> + * university of michigan as to its fitness for any purpose, and without
> + * warranty by the university of michigan of any kind, either express
> + * or implied, including without limitation the implied warranties of
> + * merchantability and fitness for a particular purpose. the regents
> + * of the university of michigan shall not be liable for any damages,
> + * including special, indirect, incidental, or consequential damages,
> + * with respect to any claim arising out or in connection with the use
> + * of the software, even if it has been or is hereafter advised of the
> + * possibility of such damages.
> + */
> +#include <linux/module.h>
> +#include <linux/init.h>
> +
> +#include <linux/nfs_fs.h>
> +#include <linux/pnfs_xdr.h> /* Needed by nfs4_pnfs.h */
> +#include <linux/nfs4_pnfs.h>
> +
> +#define NFSDBG_FACILITY NFSDBG_BLOCKLAYOUT
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Andy Adamson <andros at citi.umich.edu>");
> +MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
> +
> +/* Callback operations to the pNFS client */
> +struct pnfs_client_operations *pnfs_callback_ops;
> +
> +static int
> +bl_commit(struct pnfs_layout_type *layoutid,
> + int sync,
> + struct nfs_write_data *nfs_data)
> +{
> + dprintk("%s enter\n", __func__);
> + /* Curently, this is only allowed to return:
> + * 0 - success
> + * 1 - fall back to non-pnfs commit
> + */
> + return 1;
> +}
> +
> +static int
> +bl_read_pagelist(struct pnfs_layout_type *layoutid,
> + struct page **pages,
> + unsigned int pgbase,
> + unsigned nr_pages,
> + loff_t offset,
> + size_t count,
> + struct nfs_read_data *nfs_data)
> +{
> + dprintk("%s enter\n", __func__);
> + return 1;
> +}
> +
> +/* FRED - this should return just 0 (to indicate done for now)
> + * or 1 (to indicate try normal nfs). It can indicate bytes
> + * written in wdata->res.count. It can indicate error status in
> + * wdata->task.tk_status.
> + */
> +static int
> +bl_write_pagelist(struct pnfs_layout_type *layoutid,
> + struct page **pages,
> + unsigned int pgbase,
> + unsigned nr_pages,
> + loff_t offset,
> + size_t count,
> + int sync,
> + struct nfs_write_data *wdata)
> +{
> + dprintk("%s enter - just using nfs\n", __func__);
> + return 1;
> +}
> +
> +static void
> +bl_free_layout(struct pnfs_layout_type *layoutid)
> +{
> + dprintk("%s enter\n", __func__);
> + return;
> +}
> +
> +static struct pnfs_layout_type *
> +bl_alloc_layout(struct pnfs_mount_type *mtype, struct inode *inode)
> +{
> + dprintk("%s enter\n", __func__);
> + return NULL;
> +}
> +
> +static void
> +bl_free_lseg(struct pnfs_layout_segment *lseg)
> +{
> + dprintk("%s enter\n", __func__);
> + return;
> +}
> +
> +static struct pnfs_layout_segment *
> +bl_alloc_lseg(struct pnfs_layout_type *layoutid,
> + struct nfs4_pnfs_layoutget_res *lgr)
> +{
> + dprintk("%s enter\n", __func__);
> + return NULL;
> +}
> +
> +static int
> +bl_setup_layoutcommit(struct pnfs_layout_type *layoutid,
> + struct pnfs_layoutcommit_arg *arg)
> +{
> + dprintk("%s enter\n", __func__);
> + return 0;
> +}
> +
> +static void
> +bl_cleanup_layoutcommit(struct pnfs_layout_type *layoutid,
> + struct pnfs_layoutcommit_arg *arg,
> + struct pnfs_layoutcommit_res *res)
> +{
> + dprintk("%s enter\n", __func__);
> +}
> +
> +static struct pnfs_mount_type *
> +bl_initialize_mountpoint(struct super_block *sb, struct nfs_fh *fh)
> +{
> + dprintk("%s enter\n", __func__);
> + return NULL;
> +}
> +
> +static int
> +bl_uninitialize_mountpoint(struct pnfs_mount_type *mtype)
> +{
> + dprintk("%s enter\n", __func__);
> + return 0;
> +}
> +
> +static ssize_t
> +bl_get_stripesize(struct pnfs_layout_type *layoutid)
> +{
> + dprintk("%s enter\n", __func__);
> + return 0;
> +}
> +
> +static ssize_t
> +bl_get_io_threshold(struct pnfs_layout_type *layoutid, struct inode *inode)
> +{
> + dprintk("%s enter\n", __func__);
> + return 0;
> +}
> +
> +/* This is called by nfs_can_coalesce_requests via nfs_pageio_do_add_request.
> + * Should return False if there is a reason requests can not be coalesced,
> + * otherwise, should default to returning True.
> + */
> +static int
> +bl_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
> + struct nfs_page *req)
> +{
> + dprintk("%s enter\n", __func__);
> + return 1;
> +}
> +
> +static struct layoutdriver_io_operations blocklayout_io_operations = {
> + .commit = bl_commit,
> + .read_pagelist = bl_read_pagelist,
> + .write_pagelist = bl_write_pagelist,
> + .alloc_layout = bl_alloc_layout,
> + .free_layout = bl_free_layout,
> + .alloc_lseg = bl_alloc_lseg,
> + .free_lseg = bl_free_lseg,
> + .setup_layoutcommit = bl_setup_layoutcommit,
> + .cleanup_layoutcommit = bl_cleanup_layoutcommit,
> + .initialize_mountpoint = bl_initialize_mountpoint,
> + .uninitialize_mountpoint = bl_uninitialize_mountpoint,
> +};
> +
> +static struct layoutdriver_policy_operations blocklayout_policy_operations = {
> + .get_stripesize = bl_get_stripesize,
> + .get_read_threshold = bl_get_io_threshold,
> + .get_write_threshold = bl_get_io_threshold,
> + .pg_test = bl_pg_test,
> +};
> +
> +static struct pnfs_layoutdriver_type blocklayout_type = {
> + .id = LAYOUT_BLOCK_VOLUME,
> + .name = "LAYOUT_BLOCK_VOLUME",
> + .ld_io_ops = &blocklayout_io_operations,
> + .ld_policy_ops = &blocklayout_policy_operations,
> +};
> +
> +static int __init nfs4blocklayout_init(void)
> +{
> + dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
> +
> + pnfs_callback_ops = pnfs_register_layoutdriver(&blocklayout_type);
> + return 0;
> +}
> +
> +static void __exit nfs4blocklayout_exit(void)
> +{
> + dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
> + __func__);
> +
> + pnfs_unregister_layoutdriver(&blocklayout_type);
> +}
> +
> +module_init(nfs4blocklayout_init);
> +module_exit(nfs4blocklayout_exit);
> diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
> index 2b6c651..a15219d 100644
> --- a/include/linux/nfs_fs.h
> +++ b/include/linux/nfs_fs.h
> @@ -611,6 +611,7 @@ extern void * nfs_root_data(void);
> #define NFSDBG_PNFS 0x0800
> #define NFSDBG_FILELAYOUT 0x1000
> #define NFSDBG_IO 0x2000
> +#define NFSDBG_BLOCKLAYOUT 0x4000
I'd really prefer all layout drivers to use a single NFSDBG flag.
How about s/NFSDBG_FILELAYOUT/NFSDBG_PNFS_LD/?
Benny
> #define NFSDBG_ALL 0xFFFF
>
> #ifdef __KERNEL__
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