* Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
*/
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/file.h>
-#include <linux/mpage.h>
#include <linux/writeback.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs_page.h>
+#include <linux/backing-dev.h>
+
#include <asm/uaccess.h>
#include <linux/smp_lock.h>
static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion);
-struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount)
+struct nfs_write_data *nfs_commit_alloc(void)
{
struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS);
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
- if (pagecount < NFS_PAGEVEC_SIZE)
- p->pagevec = &p->page_array[0];
- else {
- size_t size = ++pagecount * sizeof(struct page *);
- p->pagevec = kzalloc(size, GFP_NOFS);
- if (!p->pagevec) {
- mempool_free(p, nfs_commit_mempool);
- p = NULL;
- }
- }
}
return p;
}
mempool_free(p, nfs_commit_mempool);
}
-struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
+struct nfs_write_data *nfs_writedata_alloc(size_t len)
{
+ unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
- if (pagecount < NFS_PAGEVEC_SIZE)
- p->pagevec = &p->page_array[0];
+ p->npages = pagecount;
+ if (pagecount <= ARRAY_SIZE(p->page_array))
+ p->pagevec = p->page_array;
else {
- size_t size = ++pagecount * sizeof(struct page *);
- p->pagevec = kmalloc(size, GFP_NOFS);
- if (p->pagevec) {
- memset(p->pagevec, 0, size);
- } else {
+ p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
+ if (!p->pagevec) {
mempool_free(p, nfs_wdata_mempool);
p = NULL;
}
return p;
}
-void nfs_writedata_free(struct nfs_write_data *p)
+static void nfs_writedata_free(struct nfs_write_data *p)
{
if (p && (p->pagevec != &p->page_array[0]))
kfree(p->pagevec);
int result, written = 0;
struct nfs_write_data *wdata;
- wdata = nfs_writedata_alloc(1);
+ wdata = nfs_writedata_alloc(wsize);
if (!wdata)
return -ENOMEM;
out:
clear_bit(BDI_write_congested, &bdi->state);
wake_up_all(&nfs_write_congestion);
+ congestion_end(WRITE);
return err;
}
nfs_list_add_request(req, &nfsi->dirty);
nfsi->ndirty++;
spin_unlock(&nfsi->req_lock);
- inc_page_state(nr_dirty);
+ inc_zone_page_state(req->wb_page, NR_FILE_DIRTY);
mark_inode_dirty(inode);
}
nfs_list_add_request(req, &nfsi->commit);
nfsi->ncommit++;
spin_unlock(&nfsi->req_lock);
- inc_page_state(nr_unstable);
+ inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
mark_inode_dirty(inode);
}
#endif
return ret;
}
+static void nfs_cancel_dirty_list(struct list_head *head)
+{
+ struct nfs_page *req;
+ while(!list_empty(head)) {
+ req = nfs_list_entry(head->next);
+ nfs_list_remove_request(req);
+ nfs_inode_remove_request(req);
+ nfs_clear_page_writeback(req);
+ }
+}
+
+static void nfs_cancel_commit_list(struct list_head *head)
+{
+ struct nfs_page *req;
+
+ while(!list_empty(head)) {
+ req = nfs_list_entry(head->next);
+ dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
+ nfs_list_remove_request(req);
+ nfs_inode_remove_request(req);
+ nfs_unlock_request(req);
+ }
+}
+
/*
* nfs_scan_dirty - Scan an inode for dirty requests
* @inode: NFS inode to scan
if (nfsi->ndirty != 0) {
res = nfs_scan_lock_dirty(nfsi, dst, idx_start, npages);
nfsi->ndirty -= res;
- sub_page_state(nr_dirty,res);
if ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty))
printk(KERN_ERR "NFS: desynchronized value of nfs_i.ndirty.\n");
}
int res = 0;
if (nfsi->ncommit != 0) {
- res = nfs_scan_list(&nfsi->commit, dst, idx_start, npages);
+ res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages);
nfsi->ncommit -= res;
if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit))
printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n");
struct nfs_page *req = nfs_list_entry(head->next);
struct page *page = req->wb_page;
struct nfs_write_data *data;
- unsigned int wsize = NFS_SERVER(inode)->wsize;
- unsigned int nbytes, offset;
+ size_t wsize = NFS_SERVER(inode)->wsize, nbytes;
+ unsigned int offset;
int requests = 0;
LIST_HEAD(list);
nfs_list_remove_request(req);
nbytes = req->wb_bytes;
- for (;;) {
- data = nfs_writedata_alloc(1);
+ do {
+ size_t len = min(nbytes, wsize);
+
+ data = nfs_writedata_alloc(len);
if (!data)
goto out_bad;
list_add(&data->pages, &list);
requests++;
- if (nbytes <= wsize)
- break;
- nbytes -= wsize;
- }
+ nbytes -= len;
+ } while (nbytes != 0);
atomic_set(&req->wb_complete, requests);
ClearPageError(page);
struct nfs_write_data *data;
unsigned int count;
- data = nfs_writedata_alloc(NFS_SERVER(inode)->wpages);
+ data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize);
if (!data)
goto out_bad;
dprintk("NFS: %4d nfs_writeback_done (status %d)\n",
task->tk_pid, task->tk_status);
- /* Call the NFS version-specific code */
+ /*
+ * ->write_done will attempt to use post-op attributes to detect
+ * conflicting writes by other clients. A strict interpretation
+ * of close-to-open would allow us to continue caching even if
+ * another writer had changed the file, but some applications
+ * depend on tighter cache coherency when writing.
+ */
status = NFS_PROTO(data->inode)->write_done(task, data);
if (status != 0)
return status;
if (time_before(complain, jiffies)) {
dprintk("NFS: faulty NFS server %s:"
" (committed = %d) != (stable = %d)\n",
- NFS_SERVER(data->inode)->hostname,
+ NFS_SERVER(data->inode)->nfs_client->cl_hostname,
resp->verf->committed, argp->stable);
complain = jiffies + 300 * HZ;
}
struct nfs_write_data *data;
struct nfs_page *req;
- data = nfs_commit_alloc(NFS_SERVER(inode)->wpages);
+ data = nfs_commit_alloc();
if (!data)
goto out_bad;
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
nfs_mark_request_commit(req);
+ dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
nfs_clear_page_writeback(req);
}
return -ENOMEM;
{
struct nfs_write_data *data = calldata;
struct nfs_page *req;
- int res = 0;
dprintk("NFS: %4d nfs_commit_done (status %d)\n",
task->tk_pid, task->tk_status);
while (!list_empty(&data->pages)) {
req = nfs_list_entry(data->pages.next);
nfs_list_remove_request(req);
+ dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
dprintk("NFS: commit (%s/%Ld %d@%Ld)",
req->wb_context->dentry->d_inode->i_sb->s_id,
nfs_mark_request_dirty(req);
next:
nfs_clear_page_writeback(req);
- res++;
}
- sub_page_state(nr_unstable,res);
}
static const struct rpc_call_ops nfs_commit_ops = {
pages = nfs_scan_dirty(inode, &head, idx_start, npages);
if (pages != 0) {
spin_unlock(&nfsi->req_lock);
- ret = nfs_flush_list(inode, &head, pages, how);
+ if (how & FLUSH_INVALIDATE)
+ nfs_cancel_dirty_list(&head);
+ else
+ ret = nfs_flush_list(inode, &head, pages, how);
spin_lock(&nfsi->req_lock);
continue;
}
if (nocommit)
break;
- pages = nfs_scan_commit(inode, &head, 0, 0);
+ pages = nfs_scan_commit(inode, &head, idx_start, npages);
if (pages == 0)
break;
+ if (how & FLUSH_INVALIDATE) {
+ spin_unlock(&nfsi->req_lock);
+ nfs_cancel_commit_list(&head);
+ spin_lock(&nfsi->req_lock);
+ continue;
+ }
+ pages += nfs_scan_commit(inode, &head, 0, 0);
spin_unlock(&nfsi->req_lock);
ret = nfs_commit_list(inode, &head, how);
spin_lock(&nfsi->req_lock);
return ret;
}
-int nfs_init_writepagecache(void)
+int __init nfs_init_writepagecache(void)
{
nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
sizeof(struct nfs_write_data),
{
mempool_destroy(nfs_commit_mempool);
mempool_destroy(nfs_wdata_mempool);
- if (kmem_cache_destroy(nfs_wdata_cachep))
- printk(KERN_INFO "nfs_write_data: not all structures were freed\n");
+ kmem_cache_destroy(nfs_wdata_cachep);
}
projects / linux-2.6 / blobdiff