[PATCH 08/10] pnfs: recoalesce when ld read pagelist fails

Jim Rees
2011-09-23T01:50:30Z

For pnfs pagelist read failure, we need to pg_recoalesce and resend IO to
mds.

Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Jim Rees <rees@umich.edu>
---
fs/nfs/pnfs.c | 20 +++++++-------------
fs/nfs/pnfs.h | 2 +-
fs/nfs/read.c | 12 +++++++++++-
3 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index a205c8e..ee73d9a 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1262,23 +1262,17 @@ EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
/*
* Called by non rpc-based layout drivers
*/
-int
-pnfs_ld_read_done(struct nfs_read_data *data)
+void pnfs_ld_read_done(struct nfs_read_data *data)
{
- int status;
-
- if (!data->pnfs_error) {
+ if (likely(!data->pnfs_error)) {
__nfs4_read_done_cb(data);
data->mds_ops->rpc_call_done(&data->task, data);
- data->mds_ops->rpc_release(data);
- return 0;
+ } else {
+ put_lseg(data->lseg);
+ data->lseg = NULL;
+ dprintk("pnfs write error = %d\n", data->pnfs_error);
}
-
- dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
- data->pnfs_error);
- status = nfs_initiate_read(data, NFS_CLIENT(data->inode),
- data->mds_ops);
- return status ? : -EAGAIN;
+ data->mds_ops->rpc_release(data);
}
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 71c23d4..1509530 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -202,7 +202,7 @@ void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
int _pnfs_return_layout(struct inode *);
void pnfs_ld_write_done(struct nfs_write_data *);
-int pnfs_ld_read_done(struct nfs_read_data *);
+void pnfs_ld_read_done(struct nfs_read_data *);
struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
struct nfs_open_context *ctx,
loff_t pos,
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 2171c04..bfc20b1 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -541,13 +541,23 @@ static void nfs_readpage_result_full(struct rpc_task *task, void *calldata)
static void nfs_readpage_release_full(void *calldata)
{
struct nfs_read_data *data = calldata;
+ struct nfs_pageio_descriptor pgio;

+ if (data->pnfs_error) {
+ nfs_pageio_init_read_mds(&pgio, data->inode);
+ pgio.pg_recoalesce = 1;
+ }
while (!list_empty(&data->pages)) {
struct nfs_page *req = nfs_list_entry(data->pages.next);

nfs_list_remove_request(req);
- nfs_readpage_release(req);
+ if (!data->pnfs_error)
+ nfs_readpage_release(req);
+ else
+ nfs_pageio_add_request(&pgio, req);
}
+ if (data->pnfs_error)
+ nfs_pageio_complete(&pgio);
nfs_readdata_release(calldata);
}

--
1.7.4.1