#define NFSDBG_FACILITY NFSDBG_PAGECACHE
-static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc);
-static int nfs_pagein_one(struct nfs_pageio_descriptor *desc);
+static const struct nfs_pageio_ops nfs_pageio_read_ops;
static const struct rpc_call_ops nfs_read_partial_ops;
static const struct rpc_call_ops nfs_read_full_ops;
mempool_free(p, nfs_rdata_mempool);
}
-static void nfs_readdata_release(struct nfs_read_data *rdata)
+void nfs_readdata_release(struct nfs_read_data *rdata)
{
put_lseg(rdata->lseg);
put_nfs_open_context(rdata->args.context);
}
}
+static void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
+ struct inode *inode)
+{
+ nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops,
+ NFS_SERVER(inode)->rsize, 0);
+}
+
+void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio)
+{
+ pgio->pg_ops = &nfs_pageio_read_ops;
+ pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->rsize;
+}
+EXPORT_SYMBOL_GPL(nfs_pageio_reset_read_mds);
+
+static void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
+ struct inode *inode)
+{
+ if (!pnfs_pageio_init_read(pgio, inode))
+ nfs_pageio_init_read_mds(pgio, inode);
+}
+
int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
struct page *page)
{
if (len < PAGE_CACHE_SIZE)
zero_user_segment(page, len, PAGE_CACHE_SIZE);
- nfs_pageio_init(&pgio, inode, NULL, 0, 0);
- nfs_list_add_request(new, &pgio.pg_list);
- pgio.pg_count = len;
-
- if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
- nfs_pagein_multi(&pgio);
- else
- nfs_pagein_one(&pgio);
+ nfs_pageio_init_read(&pgio, inode);
+ nfs_pageio_add_request(&pgio, new);
+ nfs_pageio_complete(&pgio);
return 0;
}
/*
* 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)
+static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
+ unsigned int count, unsigned int offset)
{
struct inode *inode = req->wb_context->dentry->d_inode;
data->req = req;
data->inode = inode;
data->cred = req->wb_context->cred;
- data->lseg = get_lseg(lseg);
data->args.fh = NFS_FH(inode);
data->args.offset = req_offset(req) + offset;
data->res.count = count;
data->res.eof = 0;
nfs_fattr_init(&data->fattr);
+}
- if (data->lseg &&
- (pnfs_try_to_read_data(data, call_ops) == PNFS_ATTEMPTED))
- return 0;
+static int nfs_do_read(struct nfs_read_data *data,
+ const struct rpc_call_ops *call_ops)
+{
+ struct inode *inode = data->args.context->dentry->d_inode;
return nfs_initiate_read(data, NFS_CLIENT(inode), call_ops);
}
+static int
+nfs_do_multiple_reads(struct list_head *head,
+ const struct rpc_call_ops *call_ops)
+{
+ struct nfs_read_data *data;
+ int ret = 0;
+
+ while (!list_empty(head)) {
+ int ret2;
+
+ data = list_entry(head->next, struct nfs_read_data, list);
+ list_del_init(&data->list);
+
+ ret2 = nfs_do_read(data, call_ops);
+ if (ret == 0)
+ ret = ret2;
+ }
+ return ret;
+}
+
static void
nfs_async_read_error(struct list_head *head)
{
* won't see the new data until our attribute cache is updated. This is more
* or less conventional NFS client behavior.
*/
-static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc)
+static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc, struct list_head *res)
{
struct nfs_page *req = nfs_list_entry(desc->pg_list.next);
struct page *page = req->wb_page;
struct nfs_read_data *data;
- size_t rsize = NFS_SERVER(desc->pg_inode)->rsize, nbytes;
+ size_t rsize = desc->pg_bsize, nbytes;
unsigned int offset;
int requests = 0;
int ret = 0;
- struct pnfs_layout_segment *lseg;
- LIST_HEAD(list);
nfs_list_remove_request(req);
+ offset = 0;
nbytes = desc->pg_count;
do {
size_t len = min(nbytes,rsize);
data = nfs_readdata_alloc(1);
if (!data)
goto out_bad;
- list_add(&data->pages, &list);
+ data->pagevec[0] = page;
+ nfs_read_rpcsetup(req, data, len, offset);
+ list_add(&data->list, res);
requests++;
nbytes -= len;
+ offset += len;
} while(nbytes != 0);
atomic_set(&req->wb_complete, requests);
-
- BUG_ON(desc->pg_lseg != NULL);
- lseg = pnfs_update_layout(desc->pg_inode, req->wb_context,
- req_offset(req), desc->pg_count,
- IOMODE_READ, GFP_KERNEL);
ClearPageError(page);
- offset = 0;
- nbytes = desc->pg_count;
- do {
- int ret2;
-
- data = list_entry(list.next, struct nfs_read_data, pages);
- list_del_init(&data->pages);
-
- data->pagevec[0] = page;
-
- if (nbytes < rsize)
- rsize = nbytes;
- ret2 = nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
- rsize, offset, lseg);
- if (ret == 0)
- ret = ret2;
- offset += rsize;
- nbytes -= rsize;
- } while (nbytes != 0);
- put_lseg(lseg);
- desc->pg_lseg = NULL;
-
+ desc->pg_rpc_callops = &nfs_read_partial_ops;
return ret;
-
out_bad:
- while (!list_empty(&list)) {
- data = list_entry(list.next, struct nfs_read_data, pages);
- list_del(&data->pages);
+ while (!list_empty(res)) {
+ data = list_entry(res->next, struct nfs_read_data, list);
+ list_del(&data->list);
nfs_readdata_free(data);
}
SetPageError(page);
return -ENOMEM;
}
-static int nfs_pagein_one(struct nfs_pageio_descriptor *desc)
+static int nfs_pagein_one(struct nfs_pageio_descriptor *desc, struct list_head *res)
{
struct nfs_page *req;
struct page **pages;
struct nfs_read_data *data;
struct list_head *head = &desc->pg_list;
- struct pnfs_layout_segment *lseg = desc->pg_lseg;
- int ret = -ENOMEM;
+ int ret = 0;
data = nfs_readdata_alloc(nfs_page_array_len(desc->pg_base,
desc->pg_count));
if (!data) {
nfs_async_read_error(head);
+ ret = -ENOMEM;
goto out;
}
*pages++ = req->wb_page;
}
req = nfs_list_entry(data->pages.next);
- if ((!lseg) && list_is_singular(&data->pages))
- lseg = pnfs_update_layout(desc->pg_inode, req->wb_context,
- req_offset(req), desc->pg_count,
- IOMODE_READ, GFP_KERNEL);
- ret = nfs_read_rpcsetup(req, data, &nfs_read_full_ops, desc->pg_count,
- 0, lseg);
+ nfs_read_rpcsetup(req, data, desc->pg_count, 0);
+ list_add(&data->list, res);
+ desc->pg_rpc_callops = &nfs_read_full_ops;
out:
- put_lseg(lseg);
- desc->pg_lseg = NULL;
return ret;
}
+int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, struct list_head *head)
+{
+ if (desc->pg_bsize < PAGE_CACHE_SIZE)
+ return nfs_pagein_multi(desc, head);
+ return nfs_pagein_one(desc, head);
+}
+
+static int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
+{
+ LIST_HEAD(head);
+ int ret;
+
+ ret = nfs_generic_pagein(desc, &head);
+ if (ret == 0)
+ ret = nfs_do_multiple_reads(&head, desc->pg_rpc_callops);
+ return ret;
+}
+
+static const struct nfs_pageio_ops nfs_pageio_read_ops = {
+ .pg_test = nfs_generic_pg_test,
+ .pg_doio = nfs_generic_pg_readpages,
+};
+
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
.pgio = &pgio,
};
struct inode *inode = mapping->host;
- struct nfs_server *server = NFS_SERVER(inode);
- size_t rsize = server->rsize;
unsigned long npages;
int ret = -ESTALE;
if (ret == 0)
goto read_complete; /* all pages were read */
- if (rsize < PAGE_CACHE_SIZE)
- nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0);
- else
- nfs_pageio_init(&pgio, inode, nfs_pagein_one, rsize, 0);
+ nfs_pageio_init_read(&pgio, inode);
ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);
git.openpandora.org / pandora-kernel.git / blobdiff