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NFS4.1: make pnfs_ld_[read|write]_done consistent 

The two functions had diverged quite a bit, with the write function
being a bit more robust than the read.

However, these still break badly in the desc->pg_bsize < PAGE_CACHE_SIZE case,
as then there is nothing hanging on the data->pages list, and the resend
ends up doing nothing.  This will be fixed in a patch later in the series.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2012-04-20 14:47:37 -04:00 коммит произвёл Trond Myklebust
Родитель a20c6bec0b
Коммит 1acbbb4e16
1 изменённых файлов: 38 добавлений и 26 удалений
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64
fs/nfs/pnfs.c
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@ -1189,6 +1189,17 @@ static int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *
return 0;
}
static void pnfs_ld_handle_write_error(struct nfs_write_data *data)
{
dprintk("pnfs write error = %d\n", data->pnfs_error);
if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
PNFS_LAYOUTRET_ON_ERROR) {
clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(data->inode)->flags);
pnfs_return_layout(data->inode);
}
data->task.tk_status = pnfs_write_done_resend_to_mds(data->inode, &data->pages);
}
/*
* Called by non rpc-based layout drivers
*/
@ -1197,19 +1208,8 @@ void pnfs_ld_write_done(struct nfs_write_data *data)
if (likely(!data->pnfs_error)) {
pnfs_set_layoutcommit(data);
data->mds_ops->rpc_call_done(&data->task, data);
} else {
dprintk("pnfs write error = %d\n", data->pnfs_error);
if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
PNFS_LAYOUTRET_ON_ERROR) {
/* Don't lo_commit on error, Server will needs to
* preform a file recovery.
*/
clear_bit(NFS_INO_LAYOUTCOMMIT,
&NFS_I(data->inode)->flags);
pnfs_return_layout(data->inode);
}
data->task.tk_status = pnfs_write_done_resend_to_mds(data->inode, &data->pages);
}
} else
pnfs_ld_handle_write_error(data);
put_lseg(data->lseg);
data->mds_ops->rpc_release(data);
}
@ -1293,26 +1293,38 @@ pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
static int pnfs_read_done_resend_to_mds(struct inode *inode, struct list_head *head)
{
struct nfs_pageio_descriptor pgio;
LIST_HEAD(failed);
put_lseg(data->lseg);
data->lseg = NULL;
dprintk("pnfs write error = %d\n", data->pnfs_error);
if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
PNFS_LAYOUTRET_ON_ERROR)
pnfs_return_layout(data->inode);
nfs_pageio_init_read_mds(&pgio, data->inode);
while (!list_empty(&data->pages)) {
struct nfs_page *req = nfs_list_entry(data->pages.next);
/* Resend all requests through the MDS */
nfs_pageio_init_read_mds(&pgio, inode);
while (!list_empty(head)) {
struct nfs_page *req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
nfs_pageio_add_request(&pgio, req);
if (!nfs_pageio_add_request(&pgio, req))
nfs_list_add_request(req, &failed);
}
nfs_pageio_complete(&pgio);
if (!list_empty(&failed)) {
list_move(&failed, head);
return -EIO;
}
return 0;
}
static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
{
dprintk("pnfs read error = %d\n", data->pnfs_error);
if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
PNFS_LAYOUTRET_ON_ERROR) {
clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(data->inode)->flags);
pnfs_return_layout(data->inode);
}
data->task.tk_status = pnfs_read_done_resend_to_mds(data->inode, &data->pages);
}
/*