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pnfs: recoalesce when ld read pagelist fails 

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>
Cc: stable@kernel.org [3.0]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Peng Tao 2011-09-22 21:50:15 -04:00 committed by Trond Myklebust
parent 8ce160c5ef
commit 9b7eecdcfe
3 changed files with 19 additions and 15 deletions
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20
fs/nfs/pnfs.c
View File

@ -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);

2
fs/nfs/pnfs.h
View File

@ -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,

12
fs/nfs/read.c
View File

@ -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);
}