* within the RPC code when root squashing is suspected.
*/
+#include <linux/config.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
-#include <linux/nfs_mount.h>
#include <linux/smp_lock.h>
#include <asm/system.h>
-#include "iostat.h"
-#include "internal.h"
-
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
static int nfs_pagein_one(struct list_head *, struct inode *);
-static const struct rpc_call_ops nfs_read_partial_ops;
-static const struct rpc_call_ops nfs_read_full_ops;
+static void nfs_readpage_result_partial(struct nfs_read_data *, int);
+static void nfs_readpage_result_full(struct nfs_read_data *, int);
static kmem_cache_t *nfs_rdata_cachep;
-static mempool_t *nfs_rdata_mempool;
+mempool_t *nfs_rdata_mempool;
#define MIN_POOL_READ (32)
-struct nfs_read_data *nfs_readdata_alloc(size_t len)
-{
- unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
-
- if (p) {
- memset(p, 0, sizeof(*p));
- INIT_LIST_HEAD(&p->pages);
- p->npages = pagecount;
- if (pagecount <= ARRAY_SIZE(p->page_array))
- p->pagevec = p->page_array;
- else {
- p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
- if (!p->pagevec) {
- mempool_free(p, nfs_rdata_mempool);
- p = NULL;
- }
- }
- }
- return p;
-}
-
-static void nfs_readdata_free(struct nfs_read_data *p)
-{
- if (p && (p->pagevec != &p->page_array[0]))
- kfree(p->pagevec);
- mempool_free(p, nfs_rdata_mempool);
-}
-
void nfs_readdata_release(void *data)
{
nfs_readdata_free(data);
return 0;
}
-static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data)
-{
- unsigned int remainder = data->args.count - data->res.count;
- unsigned int base = data->args.pgbase + data->res.count;
- unsigned int pglen;
- struct page **pages;
-
- if (data->res.eof == 0 || remainder == 0)
- return;
- /*
- * Note: "remainder" can never be negative, since we check for
- * this in the XDR code.
- */
- pages = &data->args.pages[base >> PAGE_CACHE_SHIFT];
- base &= ~PAGE_CACHE_MASK;
- pglen = PAGE_CACHE_SIZE - base;
- for (;;) {
- if (remainder <= pglen) {
- memclear_highpage_flush(*pages, base, remainder);
- break;
- }
- memclear_highpage_flush(*pages, base, pglen);
- pages++;
- remainder -= pglen;
- pglen = PAGE_CACHE_SIZE;
- base = 0;
- }
-}
-
/*
* Read a page synchronously.
*/
int result;
struct nfs_read_data *rdata;
- rdata = nfs_readdata_alloc(count);
+ rdata = nfs_readdata_alloc(1);
if (!rdata)
return -ENOMEM;
rdata->args.offset = page_offset(page) + rdata->args.pgbase;
dprintk("NFS: nfs_proc_read(%s, (%s/%Ld), %Lu, %u)\n",
- NFS_SERVER(inode)->nfs_client->cl_hostname,
+ NFS_SERVER(inode)->hostname,
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
(unsigned long long)rdata->args.pgbase,
}
count -= result;
rdata->args.pgbase += result;
- nfs_add_stats(inode, NFSIOS_SERVERREADBYTES, result);
-
/* Note: result == 0 should only happen if we're caching
* a write that extends the file and punches a hole.
*/
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
spin_unlock(&inode->i_lock);
- if (rdata->res.eof || rdata->res.count == rdata->args.count) {
- SetPageUptodate(page);
- if (rdata->res.eof && count != 0)
- memclear_highpage_flush(page, rdata->args.pgbase, count);
- }
+ if (count)
+ memclear_highpage_flush(page, rdata->args.pgbase, count);
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
result = 0;
- nfs_readpage_to_fscache(inode, page, 1);
- unlock_page(page);
-
- return result;
-
io_error:
unlock_page(page);
nfs_readdata_free(rdata);
return result;
}
-int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
+static int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
struct page *page)
{
LIST_HEAD(one_request);
static void nfs_readpage_release(struct nfs_page *req)
{
- struct inode *d_inode = req->wb_context->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,
- const struct rpc_call_ops *call_ops,
unsigned int count, unsigned int offset)
{
struct inode *inode;
- int flags;
data->req = req;
data->inode = inode = req->wb_context->dentry->d_inode;
data->res.eof = 0;
nfs_fattr_init(&data->fattr);
- /* Set up the initial task struct. */
- flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
- rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data);
NFS_PROTO(inode)->read_setup(data);
data->task.tk_cookie = (unsigned long)inode;
struct nfs_page *req = nfs_list_entry(head->next);
struct page *page = req->wb_page;
struct nfs_read_data *data;
- size_t rsize = NFS_SERVER(inode)->rsize, nbytes;
- unsigned int offset;
+ unsigned int rsize = NFS_SERVER(inode)->rsize;
+ unsigned int nbytes, offset;
int requests = 0;
LIST_HEAD(list);
nfs_list_remove_request(req);
nbytes = req->wb_bytes;
- do {
- size_t len = min(nbytes,rsize);
-
- data = nfs_readdata_alloc(len);
+ for(;;) {
+ data = nfs_readdata_alloc(1);
if (!data)
goto out_bad;
INIT_LIST_HEAD(&data->pages);
list_add(&data->pages, &list);
requests++;
- nbytes -= len;
- } while(nbytes != 0);
+ if (nbytes <= rsize)
+ break;
+ nbytes -= rsize;
+ }
atomic_set(&req->wb_complete, requests);
ClearPageError(page);
list_del_init(&data->pages);
data->pagevec[0] = page;
+ data->complete = nfs_readpage_result_partial;
if (nbytes > rsize) {
- nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
- rsize, offset);
+ nfs_read_rpcsetup(req, data, rsize, offset);
offset += rsize;
nbytes -= rsize;
} else {
- nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
- nbytes, offset);
+ nfs_read_rpcsetup(req, data, nbytes, offset);
nbytes = 0;
}
nfs_execute_read(data);
if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
return nfs_pagein_multi(head, inode);
- data = nfs_readdata_alloc(NFS_SERVER(inode)->rsize);
+ data = nfs_readdata_alloc(NFS_SERVER(inode)->rpages);
if (!data)
goto out_bad;
}
req = nfs_list_entry(data->pages.next);
- nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0);
+ data->complete = nfs_readpage_result_full;
+ nfs_read_rpcsetup(req, data, count, 0);
nfs_execute_read(data);
return 0;
/*
* Handle a read reply that fills part of a page.
*/
-static void nfs_readpage_result_partial(struct rpc_task *task, void *calldata)
+static void nfs_readpage_result_partial(struct nfs_read_data *data, int status)
{
- struct nfs_read_data *data = calldata;
struct nfs_page *req = data->req;
struct page *page = req->wb_page;
- if (likely(task->tk_status >= 0))
- nfs_readpage_truncate_uninitialised_page(data);
- else
+ if (status >= 0) {
+ unsigned int request = data->args.count;
+ unsigned int result = data->res.count;
+
+ if (result < request) {
+ memclear_highpage_flush(page,
+ data->args.pgbase + result,
+ request - result);
+ }
+ } else
SetPageError(page);
- if (nfs_readpage_result(task, data) != 0)
- return;
+
if (atomic_dec_and_test(&req->wb_complete)) {
if (!PageError(page))
SetPageUptodate(page);
}
}
-static const struct rpc_call_ops nfs_read_partial_ops = {
- .rpc_call_done = nfs_readpage_result_partial,
- .rpc_release = nfs_readdata_release,
-};
-
-static void nfs_readpage_set_pages_uptodate(struct nfs_read_data *data)
-{
- unsigned int count = data->res.count;
- unsigned int base = data->args.pgbase;
- struct page **pages;
-
- if (data->res.eof)
- count = data->args.count;
- if (unlikely(count == 0))
- return;
- pages = &data->args.pages[base >> PAGE_CACHE_SHIFT];
- base &= ~PAGE_CACHE_MASK;
- count += base;
- for (;count >= PAGE_CACHE_SIZE; count -= PAGE_CACHE_SIZE, pages++)
- SetPageUptodate(*pages);
- if (count != 0)
- SetPageUptodate(*pages);
-}
-
-static void nfs_readpage_set_pages_error(struct nfs_read_data *data)
-{
- unsigned int count = data->args.count;
- unsigned int base = data->args.pgbase;
- struct page **pages;
-
- pages = &data->args.pages[base >> PAGE_CACHE_SHIFT];
- base &= ~PAGE_CACHE_MASK;
- count += base;
- for (;count >= PAGE_CACHE_SIZE; count -= PAGE_CACHE_SIZE, pages++)
- SetPageError(*pages);
- if (count != 0)
- SetPageError(*pages);
-}
-
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
*/
-static void nfs_readpage_result_full(struct rpc_task *task, void *calldata)
+static void nfs_readpage_result_full(struct nfs_read_data *data, int status)
{
- struct nfs_read_data *data = calldata;
+ unsigned int count = data->res.count;
- /*
- * Note: nfs_readpage_result may change the values of
- * data->args. In the multi-page case, we therefore need
- * to ensure that we call the next nfs_readpage_set_page_uptodate()
- * first in the multi-page case.
- */
- if (likely(task->tk_status >= 0)) {
- nfs_readpage_truncate_uninitialised_page(data);
- nfs_readpage_set_pages_uptodate(data);
- } else
- nfs_readpage_set_pages_error(data);
- if (nfs_readpage_result(task, data) != 0)
- return;
while (!list_empty(&data->pages)) {
struct nfs_page *req = nfs_list_entry(data->pages.next);
-
+ struct page *page = req->wb_page;
nfs_list_remove_request(req);
+
+ if (status >= 0) {
+ if (count < PAGE_CACHE_SIZE) {
+ if (count < req->wb_bytes)
+ memclear_highpage_flush(page,
+ req->wb_pgbase + count,
+ req->wb_bytes - count);
+ count = 0;
+ } else
+ count -= PAGE_CACHE_SIZE;
+ SetPageUptodate(page);
+ } else
+ SetPageError(page);
nfs_readpage_release(req);
}
}
-static const struct rpc_call_ops nfs_read_full_ops = {
- .rpc_call_done = nfs_readpage_result_full,
- .rpc_release = nfs_readdata_release,
-};
-
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
*/
-int nfs_readpage_result(struct rpc_task *task, struct nfs_read_data *data)
+void nfs_readpage_result(struct rpc_task *task, void *calldata)
{
+ struct nfs_read_data *data = calldata;
struct nfs_readargs *argp = &data->args;
struct nfs_readres *resp = &data->res;
- int status;
+ int status = task->tk_status;
dprintk("NFS: %4d nfs_readpage_result, (status %d)\n",
- task->tk_pid, task->tk_status);
-
- status = NFS_PROTO(data->inode)->read_done(task, data);
- if (status != 0)
- return status;
-
- nfs_add_stats(data->inode, NFSIOS_SERVERREADBYTES, resp->count);
+ task->tk_pid, status);
/* Is this a short read? */
if (task->tk_status >= 0 && resp->count < argp->count && !resp->eof) {
- nfs_inc_stats(data->inode, NFSIOS_SHORTREAD);
/* Has the server at least made some progress? */
if (resp->count != 0) {
/* Yes, so retry the read at the end of the data */
argp->pgbase += resp->count;
argp->count -= resp->count;
rpc_restart_call(task);
- return -EAGAIN;
+ return;
}
task->tk_status = -EIO;
}
spin_lock(&data->inode->i_lock);
NFS_I(data->inode)->cache_validity |= NFS_INO_INVALID_ATIME;
spin_unlock(&data->inode->i_lock);
- return 0;
+ data->complete(data, status);
}
/*
dprintk("NFS: nfs_readpage (%p %ld@%lu)\n",
page, PAGE_CACHE_SIZE, page->index);
- nfs_inc_stats(inode, NFSIOS_VFSREADPAGE);
- nfs_add_stats(inode, NFSIOS_READPAGES, 1);
-
/*
* Try to flush any pending writes to the file..
*
ctx = get_nfs_open_context((struct nfs_open_context *)
file->private_data);
if (!IS_SYNC(inode)) {
- error = nfs_readpage_from_fscache(ctx, inode, page);
- if (error == 0)
- goto out;
-
error = nfs_readpage_async(ctx, inode, page);
goto out;
}
unsigned int len;
nfs_wb_page(inode, page);
-
len = nfs_page_length(inode, page);
if (len == 0)
return nfs_return_empty_page(page);
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
nr_pages);
- nfs_inc_stats(inode, NFSIOS_VFSREADPAGES);
if (filp == NULL) {
desc.ctx = nfs_find_open_context(inode, NULL, FMODE_READ);
} else
desc.ctx = get_nfs_open_context((struct nfs_open_context *)
filp->private_data);
-
- /* 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) {
- put_nfs_open_context(desc.ctx);
- return ret; /* all read */
- }
-
ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);
if (!list_empty(&head)) {
int err = nfs_pagein_list(&head, server->rpages);
if (!ret)
- nfs_add_stats(inode, NFSIOS_READPAGES, err);
ret = err;
}
put_nfs_open_context(desc.ctx);
return ret;
}
-int __init nfs_init_readpagecache(void)
+int nfs_init_readpagecache(void)
{
nfs_rdata_cachep = kmem_cache_create("nfs_read_data",
sizeof(struct nfs_read_data),
if (nfs_rdata_cachep == NULL)
return -ENOMEM;
- nfs_rdata_mempool = mempool_create_slab_pool(MIN_POOL_READ,
- nfs_rdata_cachep);
+ nfs_rdata_mempool = mempool_create(MIN_POOL_READ,
+ mempool_alloc_slab,
+ mempool_free_slab,
+ nfs_rdata_cachep);
if (nfs_rdata_mempool == NULL)
return -ENOMEM;
git://git.onelab.eu / linux-2.6.git / blobdiff