On 2011-02-14 14:18, andros@xxxxxxxxxx wrote:
> From: Andy Adamson <andros@xxxxxxxxxx>
Andy, taking into account the many contributors to this patch
the author should be "The pNFS Team" IMO.
>
> Separate the rpc run portion of nfs_read_rpcsetup into a new function
> nfs_initiate_read that is called for normal NFS I/O.
>
> Add a pNFS read_pagelist function that is called instead of nfs_intitate_read
> for pNFS reads.
>
> Reported-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
historical trivia? :)
Benny
> Signed-off-by: Andy Adamson <andros@xxxxxxxxxxxxxx>
> Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
> Signed-off-by: Dean Hildebrand <dhildeb@xxxxxxxxxx>
> Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
> Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxx>
> Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxxxx>
> Signed-off-by: Mike Sager <sager@xxxxxxxxxx>
> Signed-off-by: Mingyang Guo <guomingyang@xxxxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> Signed-off-by: Tao Guo <guotao@xxxxxxxxxxxx>
> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> ---
> fs/nfs/internal.h | 2 +
> fs/nfs/pnfs.c | 28 ++++++++++++++++++
> fs/nfs/pnfs.h | 20 +++++++++++++
> fs/nfs/read.c | 66 +++++++++++++++++++++++++++----------------
> include/linux/nfs_iostat.h | 1 +
> include/linux/nfs_xdr.h | 1 +
> 6 files changed, 93 insertions(+), 25 deletions(-)
>
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index cf9fdbd..335755d 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -262,6 +262,8 @@ extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
> #endif
>
> /* read.c */
> +extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
> + const struct rpc_call_ops *call_ops);
> extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
>
> /* write.c */
> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
> index f200e34..6f4a5ab 100644
> --- a/fs/nfs/pnfs.c
> +++ b/fs/nfs/pnfs.c
> @@ -30,6 +30,7 @@
> #include <linux/nfs_fs.h>
> #include "internal.h"
> #include "pnfs.h"
> +#include "iostat.h"
>
> #define NFSDBG_FACILITY NFSDBG_PNFS
>
> @@ -891,6 +892,33 @@ pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
> }
>
> /*
> + * Call the appropriate parallel I/O subsystem read function.
> + */
> +enum pnfs_try_status
> +pnfs_try_to_read_data(struct nfs_read_data *rdata,
> + const struct rpc_call_ops *call_ops)
> +{
> + struct inode *inode = rdata->inode;
> + struct nfs_server *nfss = NFS_SERVER(inode);
> + enum pnfs_try_status trypnfs;
> +
> + rdata->mds_ops = call_ops;
> +
> + dprintk("%s: Reading ino:%lu %u@%llu\n",
> + __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
> +
> + trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
> + if (trypnfs == PNFS_NOT_ATTEMPTED) {
> + put_lseg(rdata->lseg);
> + rdata->lseg = NULL;
> + } else {
> + nfs_inc_stats(inode, NFSIOS_PNFS_READ);
> + }
> + dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
> + return trypnfs;
> +}
> +
> +/*
> * Device ID cache. Currently supports one layout type per struct nfs_client.
> * Add layout type to the lookup key to expand to support multiple types.
> */
> diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
> index 5107d14..585023f 100644
> --- a/fs/nfs/pnfs.h
> +++ b/fs/nfs/pnfs.h
> @@ -45,6 +45,11 @@ struct pnfs_layout_segment {
> struct pnfs_layout_hdr *pls_layout;
> };
>
> +enum pnfs_try_status {
> + PNFS_ATTEMPTED = 0,
> + PNFS_NOT_ATTEMPTED = 1,
> +};
> +
> #ifdef CONFIG_NFS_V4_1
>
> #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
> @@ -70,6 +75,12 @@ struct pnfs_layoutdriver_type {
>
> /* test for nfs page cache coalescing */
> int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
> +
> + /*
> + * Return PNFS_ATTEMPTED to indicate the layout code has attempted
> + * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
> + */
> + enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
> };
>
> struct pnfs_layout_hdr {
> @@ -157,6 +168,8 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
> enum pnfs_iomode access_type);
> void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
> void unset_pnfs_layoutdriver(struct nfs_server *);
> +enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
> + const struct rpc_call_ops *);
> void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
> int pnfs_layout_process(struct nfs4_layoutget *lgp);
> void pnfs_free_lseg_list(struct list_head *tmp_list);
> @@ -227,6 +240,13 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
> return NULL;
> }
>
> +static inline enum pnfs_try_status
> +pnfs_try_to_read_data(struct nfs_read_data *data,
> + const struct rpc_call_ops *call_ops)
> +{
> + return PNFS_NOT_ATTEMPTED;
> +}
> +
> static inline bool
> pnfs_roc(struct inode *ino)
> {
> diff --git a/fs/nfs/read.c b/fs/nfs/read.c
> index 20cc936..5c09d72 100644
> --- a/fs/nfs/read.c
> +++ b/fs/nfs/read.c
> @@ -18,6 +18,8 @@
> #include <linux/sunrpc/clnt.h>
> #include <linux/nfs_fs.h>
> #include <linux/nfs_page.h>
> +#include <linux/smp_lock.h>
> +#include <linux/module.h>
>
> #include <asm/system.h>
> #include "pnfs.h"
> @@ -158,25 +160,20 @@ static void nfs_readpage_release(struct nfs_page *req)
> nfs_release_request(req);
> }
>
> -/*
> - * Set up the NFS read request struct
> - */
> -static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
> - const struct rpc_call_ops *call_ops,
> - unsigned int count, unsigned int offset,
> - struct pnfs_layout_segment *lseg)
> +int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
> + const struct rpc_call_ops *call_ops)
> {
> - struct inode *inode = req->wb_context->path.dentry->d_inode;
> + struct inode *inode = data->inode;
> int swap_flags = IS_SWAPFILE(inode) ? NFS_RPC_SWAPFLAGS : 0;
> struct rpc_task *task;
> struct rpc_message msg = {
> .rpc_argp = &data->args,
> .rpc_resp = &data->res,
> - .rpc_cred = req->wb_context->cred,
> + .rpc_cred = data->cred,
> };
> struct rpc_task_setup task_setup_data = {
> .task = &data->task,
> - .rpc_client = NFS_CLIENT(inode),
> + .rpc_client = clnt,
> .rpc_message = &msg,
> .callback_ops = call_ops,
> .callback_data = data,
> @@ -184,9 +181,38 @@ static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
> .flags = RPC_TASK_ASYNC | swap_flags,
> };
>
> + /* Set up the initial task struct. */
> + NFS_PROTO(inode)->read_setup(data, &msg);
> +
> + dprintk("NFS: %5u initiated read call (req %s/%lld, %u bytes @ "
> + "offset %llu)\n",
> + data->task.tk_pid,
> + inode->i_sb->s_id,
> + (long long)NFS_FILEID(inode),
> + data->args.count,
> + (unsigned long long)data->args.offset);
> +
> + task = rpc_run_task(&task_setup_data);
> + if (IS_ERR(task))
> + return PTR_ERR(task);
> + rpc_put_task(task);
> + return 0;
> +}
> +EXPORT_SYMBOL(nfs_initiate_read);
> +
> +/*
> + * Set up the NFS read request struct
> + */
> +static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
> + const struct rpc_call_ops *call_ops,
> + unsigned int count, unsigned int offset,
> + struct pnfs_layout_segment *lseg)
> +{
> + struct inode *inode = req->wb_context->path.dentry->d_inode;
> +
> data->req = req;
> data->inode = inode;
> - data->cred = msg.rpc_cred;
> + data->cred = req->wb_context->cred;
> data->lseg = get_lseg(lseg);
>
> data->args.fh = NFS_FH(inode);
> @@ -202,21 +228,11 @@ static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
> data->res.eof = 0;
> nfs_fattr_init(&data->fattr);
>
> - /* Set up the initial task struct. */
> - NFS_PROTO(inode)->read_setup(data, &msg);
> -
> - dprintk("NFS: %5u initiated read call (req %s/%Ld, %u bytes @ offset %Lu)\n",
> - data->task.tk_pid,
> - inode->i_sb->s_id,
> - (long long)NFS_FILEID(inode),
> - count,
> - (unsigned long long)data->args.offset);
> + if (data->lseg &&
> + (pnfs_try_to_read_data(data, call_ops) == PNFS_ATTEMPTED))
> + return 0;
>
> - task = rpc_run_task(&task_setup_data);
> - if (IS_ERR(task))
> - return PTR_ERR(task);
> - rpc_put_task(task);
> - return 0;
> + return nfs_initiate_read(data, NFS_CLIENT(inode), call_ops);
> }
>
> static void
> diff --git a/include/linux/nfs_iostat.h b/include/linux/nfs_iostat.h
> index 68b10f5..37a1437 100644
> --- a/include/linux/nfs_iostat.h
> +++ b/include/linux/nfs_iostat.h
> @@ -113,6 +113,7 @@ enum nfs_stat_eventcounters {
> NFSIOS_SHORTREAD,
> NFSIOS_SHORTWRITE,
> NFSIOS_DELAY,
> + NFSIOS_PNFS_READ,
> __NFSIOS_COUNTSMAX,
> };
>
> diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
> index 37e91c3..4591075 100644
> --- a/include/linux/nfs_xdr.h
> +++ b/include/linux/nfs_xdr.h
> @@ -1018,6 +1018,7 @@ struct nfs_read_data {
> struct nfs_readres res;
> unsigned long timestamp; /* For lease renewal */
> struct pnfs_layout_segment *lseg;
> + const struct rpc_call_ops *mds_ops;
> struct page *page_array[NFS_PAGEVEC_SIZE];
> };
>
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