NFSv4.1: implement generic pnfs layer write switch
Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Mike Sager <sager@netapp.com>
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 0040a5e..9d21bfe 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -238,6 +238,12 @@
return PNFS_ATTEMPTED;
}
+static enum pnfs_try_status
+filelayout_write_pagelist(struct nfs_write_data *data, int sync)
+{
+ return PNFS_NOT_ATTEMPTED;
+}
+
/*
* filelayout_check_layout()
*
@@ -455,6 +461,7 @@
.free_lseg = filelayout_free_lseg,
.pg_test = filelayout_pg_test,
.read_pagelist = filelayout_read_pagelist,
+ .write_pagelist = filelayout_write_pagelist,
};
static int __init nfs4filelayout_init(void)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 5f205d3..f38813a 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -895,6 +895,30 @@
pgio->pg_test = (ld && ld->pg_test) ? pnfs_write_pg_test : NULL;
}
+enum pnfs_try_status
+pnfs_try_to_write_data(struct nfs_write_data *wdata,
+ const struct rpc_call_ops *call_ops, int how)
+{
+ struct inode *inode = wdata->inode;
+ enum pnfs_try_status trypnfs;
+ struct nfs_server *nfss = NFS_SERVER(inode);
+
+ wdata->mds_ops = call_ops;
+
+ dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
+ inode->i_ino, wdata->args.count, wdata->args.offset, how);
+
+ trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
+ if (trypnfs == PNFS_NOT_ATTEMPTED) {
+ put_lseg(wdata->lseg);
+ wdata->lseg = NULL;
+ } else
+ nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
+
+ dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
+ return trypnfs;
+}
+
/*
* Call the appropriate parallel I/O subsystem read function.
*/
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 1d4e631..6380b94 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -79,6 +79,7 @@
* 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);
+ enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
};
struct pnfs_layout_hdr {
@@ -120,6 +121,8 @@
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_write_data(struct nfs_write_data *,
+ const struct rpc_call_ops *, int);
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 *);
@@ -200,6 +203,13 @@
return PNFS_NOT_ATTEMPTED;
}
+static inline enum pnfs_try_status
+pnfs_try_to_write_data(struct nfs_write_data *data,
+ const struct rpc_call_ops *call_ops, int how)
+{
+ return PNFS_NOT_ATTEMPTED;
+}
+
static inline bool
pnfs_roc(struct inode *ino)
{
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 49c4784..df99c5b 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -873,6 +873,10 @@
data->res.verf = &data->verf;
nfs_fattr_init(&data->fattr);
+ if (data->lseg &&
+ (pnfs_try_to_write_data(data, call_ops, how) == PNFS_ATTEMPTED))
+ return 0;
+
return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how);
}
diff --git a/include/linux/nfs_iostat.h b/include/linux/nfs_iostat.h
index 37a1437..8866bb3 100644
--- a/include/linux/nfs_iostat.h
+++ b/include/linux/nfs_iostat.h
@@ -114,6 +114,7 @@
NFSIOS_SHORTWRITE,
NFSIOS_DELAY,
NFSIOS_PNFS_READ,
+ NFSIOS_PNFS_WRITE,
__NFSIOS_COUNTSMAX,
};
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 09d9681..c82ad33 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1039,6 +1039,7 @@
struct nfs_writeargs args; /* argument struct */
struct nfs_writeres res; /* result struct */
struct pnfs_layout_segment *lseg;
+ const struct rpc_call_ops *mds_ops;
int (*write_done_cb) (struct rpc_task *task, struct nfs_write_data *data);
#ifdef CONFIG_NFS_V4
unsigned long timestamp; /* For lease renewal */