#include <linux/sunrpc/clnt.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
-#include <linux/smp_lock.h>
#include <asm/system.h>
+#include "nfs4_fs.h"
#include "internal.h"
#include "iostat.h"
+#include "fscache.h"
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
{
- struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, GFP_NOFS);
+ struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, GFP_KERNEL);
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
p->npages = pagecount;
+ p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
if (pagecount <= ARRAY_SIZE(p->page_array))
p->pagevec = p->page_array;
else {
- p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
+ p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
if (!p->pagevec) {
mempool_free(p, nfs_rdata_mempool);
p = NULL;
return p;
}
-static void nfs_readdata_rcu_free(struct rcu_head *head)
+void nfs_readdata_free(struct nfs_read_data *p)
{
- struct nfs_read_data *p = container_of(head, struct nfs_read_data, task.u.tk_rcu);
if (p && (p->pagevec != &p->page_array[0]))
kfree(p->pagevec);
mempool_free(p, nfs_rdata_mempool);
}
-static void nfs_readdata_free(struct nfs_read_data *rdata)
+static void nfs_readdata_release(struct nfs_read_data *rdata)
{
- call_rcu_bh(&rdata->task.u.tk_rcu, nfs_readdata_rcu_free);
-}
-
-void nfs_readdata_release(void *data)
-{
- nfs_readdata_free(data);
+ put_nfs_open_context(rdata->args.context);
+ nfs_readdata_free(rdata);
}
static
int nfs_return_empty_page(struct page *page)
{
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
unlock_page(page);
return 0;
pglen = PAGE_CACHE_SIZE - base;
for (;;) {
if (remainder <= pglen) {
- zero_user_page(*pages, base, remainder, KM_USER0);
+ zero_user(*pages, base, remainder);
break;
}
- zero_user_page(*pages, base, pglen, KM_USER0);
+ zero_user(*pages, base, pglen);
pages++;
remainder -= pglen;
pglen = PAGE_CACHE_SIZE;
}
}
-static int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
- struct page *page)
+int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
+ struct page *page)
{
LIST_HEAD(one_request);
struct nfs_page *new;
return PTR_ERR(new);
}
if (len < PAGE_CACHE_SIZE)
- zero_user_page(page, len, PAGE_CACHE_SIZE - len, KM_USER0);
+ zero_user_segment(page, len, PAGE_CACHE_SIZE);
nfs_list_add_request(new, &one_request);
if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
static void nfs_readpage_release(struct nfs_page *req)
{
+ struct inode *d_inode = req->wb_context->path.dentry->d_inode;
+
+ if (PageUptodate(req->wb_page))
+ nfs_readpage_to_fscache(d_inode, req->wb_page, 0);
+
unlock_page(req->wb_page);
dprintk("NFS: read done (%s/%Ld %d@%Ld)\n",
/*
* Set up the NFS read request struct
*/
-static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
+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 inode *inode = req->wb_context->path.dentry->d_inode;
int swap_flags = IS_SWAPFILE(inode) ? NFS_RPC_SWAPFLAGS : 0;
+ struct rpc_task *task;
+ struct rpc_message msg = {
+ .rpc_argp = &data->args,
+ .rpc_resp = &data->res,
+ .rpc_cred = req->wb_context->cred,
+ };
struct rpc_task_setup task_setup_data = {
+ .task = &data->task,
.rpc_client = NFS_CLIENT(inode),
+ .rpc_message = &msg,
.callback_ops = call_ops,
.callback_data = data,
+ .workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC | swap_flags,
};
data->req = req;
data->inode = inode;
- data->cred = req->wb_context->cred;
+ data->cred = msg.rpc_cred;
data->args.fh = NFS_FH(inode);
data->args.offset = req_offset(req) + offset;
data->args.pgbase = req->wb_pgbase + offset;
data->args.pages = data->pagevec;
data->args.count = count;
- data->args.context = req->wb_context;
+ data->args.context = get_nfs_open_context(req->wb_context);
data->res.fattr = &data->fattr;
data->res.count = count;
nfs_fattr_init(&data->fattr);
/* Set up the initial task struct. */
- rpc_init_task(&data->task, &task_setup_data);
- NFS_PROTO(inode)->read_setup(data);
+ NFS_PROTO(inode)->read_setup(data, &msg);
dprintk("NFS: %5u initiated read call (req %s/%Ld, %u bytes @ offset %Lu)\n",
data->task.tk_pid,
(long long)NFS_FILEID(inode),
count,
(unsigned long long)data->args.offset);
+
+ task = rpc_run_task(&task_setup_data);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ rpc_put_task(task);
+ return 0;
}
static void
}
/*
- * Start an async read operation
- */
-static void nfs_execute_read(struct nfs_read_data *data)
-{
- struct rpc_clnt *clnt = NFS_CLIENT(data->inode);
- sigset_t oldset;
-
- rpc_clnt_sigmask(clnt, &oldset);
- rpc_execute(&data->task);
- rpc_clnt_sigunmask(clnt, &oldset);
-}
-
-/*
* Generate multiple requests to fill a single page.
*
* We optimize to reduce the number of read operations on the wire. If we
size_t rsize = NFS_SERVER(inode)->rsize, nbytes;
unsigned int offset;
int requests = 0;
+ int ret = 0;
LIST_HEAD(list);
nfs_list_remove_request(req);
data = nfs_readdata_alloc(1);
if (!data)
goto out_bad;
- INIT_LIST_HEAD(&data->pages);
list_add(&data->pages, &list);
requests++;
nbytes -= len;
offset = 0;
nbytes = count;
do {
+ int ret2;
+
data = list_entry(list.next, struct nfs_read_data, pages);
list_del_init(&data->pages);
if (nbytes < rsize)
rsize = nbytes;
- nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
+ ret2 = nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
rsize, offset);
+ if (ret == 0)
+ ret = ret2;
offset += rsize;
nbytes -= rsize;
- nfs_execute_read(data);
} while (nbytes != 0);
- return 0;
+ return ret;
out_bad:
while (!list_empty(&list)) {
struct nfs_page *req;
struct page **pages;
struct nfs_read_data *data;
+ int ret = -ENOMEM;
data = nfs_readdata_alloc(npages);
if (!data)
goto out_bad;
- INIT_LIST_HEAD(&data->pages);
pages = data->pagevec;
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
}
req = nfs_list_entry(data->pages.next);
- nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0);
-
- nfs_execute_read(data);
- return 0;
+ return nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0);
out_bad:
nfs_async_read_error(head);
- return -ENOMEM;
+ return ret;
}
/*
{
int status;
- dprintk("NFS: %s: %5u, (status %d)\n", __FUNCTION__, task->tk_pid,
+ dprintk("NFS: %s: %5u, (status %d)\n", __func__, task->tk_pid,
task->tk_status);
status = NFS_PROTO(data->inode)->read_done(task, data);
nfs_add_stats(data->inode, NFSIOS_SERVERREADBYTES, data->res.count);
if (task->tk_status == -ESTALE) {
- set_bit(NFS_INO_STALE, &NFS_FLAGS(data->inode));
+ set_bit(NFS_INO_STALE, &NFS_I(data->inode)->flags);
nfs_mark_for_revalidate(data->inode);
}
return 0;
}
-static int nfs_readpage_retry(struct rpc_task *task, struct nfs_read_data *data)
+static void nfs_readpage_retry(struct rpc_task *task, struct nfs_read_data *data)
{
struct nfs_readargs *argp = &data->args;
struct nfs_readres *resp = &data->res;
if (resp->eof || resp->count == argp->count)
- return 0;
+ return;
/* This is a short read! */
nfs_inc_stats(data->inode, NFSIOS_SHORTREAD);
/* Has the server at least made some progress? */
if (resp->count == 0)
- return 0;
+ return;
/* Yes, so retry the read at the end of the data */
argp->offset += resp->count;
argp->pgbase += resp->count;
argp->count -= resp->count;
- rpc_restart_call(task);
- return -EAGAIN;
+ nfs_restart_rpc(task, NFS_SERVER(data->inode)->nfs_client);
}
/*
static void nfs_readpage_result_partial(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
- struct nfs_page *req = data->req;
- struct page *page = req->wb_page;
if (nfs_readpage_result(task, data) != 0)
return;
+ if (task->tk_status < 0)
+ return;
- if (likely(task->tk_status >= 0)) {
- nfs_readpage_truncate_uninitialised_page(data);
- if (nfs_readpage_retry(task, data) != 0)
- return;
- }
- if (unlikely(task->tk_status < 0))
+ nfs_readpage_truncate_uninitialised_page(data);
+ nfs_readpage_retry(task, data);
+}
+
+static void nfs_readpage_release_partial(void *calldata)
+{
+ struct nfs_read_data *data = calldata;
+ struct nfs_page *req = data->req;
+ struct page *page = req->wb_page;
+ int status = data->task.tk_status;
+
+ if (status < 0)
SetPageError(page);
+
if (atomic_dec_and_test(&req->wb_complete)) {
if (!PageError(page))
SetPageUptodate(page);
nfs_readpage_release(req);
}
+ nfs_readdata_release(calldata);
+}
+
+#if defined(CONFIG_NFS_V4_1)
+void nfs_read_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs_read_data *data = calldata;
+
+ if (nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
+ &data->args.seq_args, &data->res.seq_res,
+ 0, task))
+ return;
+ rpc_call_start(task);
}
+#endif /* CONFIG_NFS_V4_1 */
static const struct rpc_call_ops nfs_read_partial_ops = {
+#if defined(CONFIG_NFS_V4_1)
+ .rpc_call_prepare = nfs_read_prepare,
+#endif /* CONFIG_NFS_V4_1 */
.rpc_call_done = nfs_readpage_result_partial,
- .rpc_release = nfs_readdata_release,
+ .rpc_release = nfs_readpage_release_partial,
};
static void nfs_readpage_set_pages_uptodate(struct nfs_read_data *data)
if (nfs_readpage_result(task, data) != 0)
return;
+ if (task->tk_status < 0)
+ return;
/*
* Note: nfs_readpage_retry may change the values of
* data->args. In the multi-page case, we therefore need
* to ensure that we call nfs_readpage_set_pages_uptodate()
* first.
*/
- if (likely(task->tk_status >= 0)) {
- nfs_readpage_truncate_uninitialised_page(data);
- nfs_readpage_set_pages_uptodate(data);
- if (nfs_readpage_retry(task, data) != 0)
- return;
- }
+ nfs_readpage_truncate_uninitialised_page(data);
+ nfs_readpage_set_pages_uptodate(data);
+ nfs_readpage_retry(task, data);
+}
+
+static void nfs_readpage_release_full(void *calldata)
+{
+ struct nfs_read_data *data = calldata;
+
while (!list_empty(&data->pages)) {
struct nfs_page *req = nfs_list_entry(data->pages.next);
nfs_list_remove_request(req);
nfs_readpage_release(req);
}
+ nfs_readdata_release(calldata);
}
static const struct rpc_call_ops nfs_read_full_ops = {
+#if defined(CONFIG_NFS_V4_1)
+ .rpc_call_prepare = nfs_read_prepare,
+#endif /* CONFIG_NFS_V4_1 */
.rpc_call_done = nfs_readpage_result_full,
- .rpc_release = nfs_readdata_release,
+ .rpc_release = nfs_readpage_release_full,
};
/*
} else
ctx = get_nfs_open_context(nfs_file_open_context(file));
+ if (!IS_SYNC(inode)) {
+ error = nfs_readpage_from_fscache(ctx, inode, page);
+ if (error == 0)
+ goto out;
+ }
+
error = nfs_readpage_async(ctx, inode, page);
+out:
put_nfs_open_context(ctx);
return error;
out_unlock:
unsigned int len;
int error;
- error = nfs_wb_page(inode, page);
- if (error)
- goto out_unlock;
- if (PageUptodate(page))
- goto out_unlock;
-
len = nfs_page_length(page);
if (len == 0)
return nfs_return_empty_page(page);
goto out_error;
if (len < PAGE_CACHE_SIZE)
- zero_user_page(page, len, PAGE_CACHE_SIZE - len, KM_USER0);
- nfs_pageio_add_request(desc->pgio, new);
+ zero_user_segment(page, len, PAGE_CACHE_SIZE);
+ if (!nfs_pageio_add_request(desc->pgio, new)) {
+ error = desc->pgio->pg_error;
+ goto out_unlock;
+ }
return 0;
out_error:
error = PTR_ERR(new);
return -EBADF;
} else
desc.ctx = get_nfs_open_context(nfs_file_open_context(filp));
+
+ /* attempt to read as many of the pages as possible from the cache
+ * - this returns -ENOBUFS immediately if the cookie is negative
+ */
+ ret = nfs_readpages_from_fscache(desc.ctx, inode, mapping,
+ pages, &nr_pages);
+ 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_complete(&pgio);
npages = (pgio.pg_bytes_written + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
nfs_add_stats(inode, NFSIOS_READPAGES, npages);
+read_complete:
put_nfs_open_context(desc.ctx);
out:
return ret;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff