* 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>
-#include <linux/mempool.h>
+
+#include "delegation.h"
+#include "internal.h"
+#include "iostat.h"
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
/*
* Local function declarations
*/
-static struct nfs_page * nfs_update_request(struct file*, struct inode *,
+static struct nfs_page * nfs_update_request(struct nfs_open_context*,
struct page *,
unsigned int, unsigned int);
-static void nfs_writeback_done_partial(struct nfs_write_data *, int);
-static void nfs_writeback_done_full(struct nfs_write_data *, int);
+static void nfs_mark_request_dirty(struct nfs_page *req);
static int nfs_wait_on_write_congestion(struct address_space *, int);
static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int);
+static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how);
+static const struct rpc_call_ops nfs_write_partial_ops;
+static const struct rpc_call_ops nfs_write_full_ops;
+static const struct rpc_call_ops nfs_commit_ops;
-static kmem_cache_t *nfs_wdata_cachep;
+static struct kmem_cache *nfs_wdata_cachep;
static mempool_t *nfs_wdata_mempool;
static mempool_t *nfs_commit_mempool;
static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion);
-static __inline__ struct nfs_write_data *nfs_writedata_alloc(void)
+struct nfs_write_data *nfs_commit_alloc(void)
{
- struct nfs_write_data *p;
- p = (struct nfs_write_data *)mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
+ struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
+
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
return p;
}
-static __inline__ void nfs_writedata_free(struct nfs_write_data *p)
+void nfs_commit_rcu_free(struct rcu_head *head)
{
- mempool_free(p, nfs_wdata_mempool);
+ struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
+ if (p && (p->pagevec != &p->page_array[0]))
+ kfree(p->pagevec);
+ mempool_free(p, nfs_commit_mempool);
}
-static void nfs_writedata_release(struct rpc_task *task)
+void nfs_commit_free(struct nfs_write_data *wdata)
{
- struct nfs_write_data *wdata = (struct nfs_write_data *)task->tk_calldata;
- nfs_writedata_free(wdata);
+ call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free);
}
-static __inline__ struct nfs_write_data *nfs_commit_alloc(void)
+struct nfs_write_data *nfs_writedata_alloc(size_t len)
{
- struct nfs_write_data *p;
- p = (struct nfs_write_data *)mempool_alloc(nfs_commit_mempool, SLAB_NOFS);
+ unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_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_wdata_mempool);
+ p = NULL;
+ }
+ }
}
return p;
}
-static __inline__ void nfs_commit_free(struct nfs_write_data *p)
+static void nfs_writedata_rcu_free(struct rcu_head *head)
{
- mempool_free(p, nfs_commit_mempool);
+ struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
+ if (p && (p->pagevec != &p->page_array[0]))
+ kfree(p->pagevec);
+ mempool_free(p, nfs_wdata_mempool);
+}
+
+static void nfs_writedata_free(struct nfs_write_data *wdata)
+{
+ call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free);
+}
+
+void nfs_writedata_release(void *wdata)
+{
+ nfs_writedata_free(wdata);
+}
+
+static struct nfs_page *nfs_page_find_request_locked(struct page *page)
+{
+ struct nfs_page *req = NULL;
+
+ if (PagePrivate(page)) {
+ req = (struct nfs_page *)page_private(page);
+ if (req != NULL)
+ atomic_inc(&req->wb_count);
+ }
+ return req;
+}
+
+static struct nfs_page *nfs_page_find_request(struct page *page)
+{
+ struct nfs_page *req = NULL;
+ spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
+
+ spin_lock(req_lock);
+ req = nfs_page_find_request_locked(page);
+ spin_unlock(req_lock);
+ return req;
}
/* Adjust the file length if we're writing beyond the end */
end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
if (i_size >= end)
return;
+ nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
i_size_write(inode, end);
}
*/
static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
{
- loff_t end_offs;
-
if (PageUptodate(page))
return;
if (base != 0)
return;
- if (count == PAGE_CACHE_SIZE) {
- SetPageUptodate(page);
+ if (count != nfs_page_length(page))
return;
- }
-
- end_offs = i_size_read(page->mapping->host) - 1;
- if (end_offs < 0)
- return;
- /* Is this the last page? */
- if (page->index != (unsigned long)(end_offs >> PAGE_CACHE_SHIFT))
- return;
- /* This is the last page: set PG_uptodate if we cover the entire
- * extent of the data, then zero the rest of the page.
- */
- if (count == (unsigned int)(end_offs & (PAGE_CACHE_SIZE - 1)) + 1) {
+ if (count != PAGE_CACHE_SIZE)
memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count);
- SetPageUptodate(page);
- }
+ SetPageUptodate(page);
}
-/*
- * Write a page synchronously.
- * Offset is the data offset within the page.
- */
-static int nfs_writepage_sync(struct file *file, struct inode *inode,
- struct page *page, unsigned int offset, unsigned int count,
- int how)
-{
- unsigned int wsize = NFS_SERVER(inode)->wsize;
- int result, written = 0;
- struct nfs_write_data wdata = {
- .flags = how,
- .cred = NULL,
- .inode = inode,
- .args = {
- .fh = NFS_FH(inode),
- .lockowner = current->files,
- .pages = &page,
- .stable = NFS_FILE_SYNC,
- .pgbase = offset,
- .count = wsize,
- },
- .res = {
- .fattr = &wdata.fattr,
- .verf = &wdata.verf,
- },
- };
-
- dprintk("NFS: nfs_writepage_sync(%s/%Ld %d@%Ld)\n",
- inode->i_sb->s_id,
- (long long)NFS_FILEID(inode),
- count, (long long)(page_offset(page) + offset));
-
- nfs_begin_data_update(inode);
- do {
- if (count < wsize)
- wdata.args.count = count;
- wdata.args.offset = page_offset(page) + wdata.args.pgbase;
-
- result = NFS_PROTO(inode)->write(&wdata, file);
-
- if (result < 0) {
- /* Must mark the page invalid after I/O error */
- ClearPageUptodate(page);
- goto io_error;
- }
- if (result < wdata.args.count)
- printk(KERN_WARNING "NFS: short write, count=%u, result=%d\n",
- wdata.args.count, result);
-
- wdata.args.offset += result;
- wdata.args.pgbase += result;
- written += result;
- count -= result;
- } while (count);
- /* Update file length */
- nfs_grow_file(page, offset, written);
- /* Set the PG_uptodate flag? */
- nfs_mark_uptodate(page, offset, written);
-
- if (PageError(page))
- ClearPageError(page);
-
-io_error:
- nfs_end_data_update_defer(inode);
- if (wdata.cred)
- put_rpccred(wdata.cred);
-
- return written ? written : result;
-}
-
-static int nfs_writepage_async(struct file *file, struct inode *inode,
- struct page *page, unsigned int offset, unsigned int count)
+static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
+ unsigned int offset, unsigned int count)
{
struct nfs_page *req;
- int status;
+ int ret;
- req = nfs_update_request(file, inode, page, offset, count);
- status = (IS_ERR(req)) ? PTR_ERR(req) : 0;
- if (status < 0)
- goto out;
+ for (;;) {
+ req = nfs_update_request(ctx, page, offset, count);
+ if (!IS_ERR(req))
+ break;
+ ret = PTR_ERR(req);
+ if (ret != -EBUSY)
+ return ret;
+ ret = nfs_wb_page(page->mapping->host, page);
+ if (ret != 0)
+ return ret;
+ }
/* Update file length */
nfs_grow_file(page, offset, count);
/* Set the PG_uptodate flag? */
nfs_mark_uptodate(page, offset, count);
nfs_unlock_request(req);
- out:
- return status;
+ return 0;
}
static int wb_priority(struct writeback_control *wbc)
return 0;
}
+/*
+ * Find an associated nfs write request, and prepare to flush it out
+ * Returns 1 if there was no write request, or if the request was
+ * already tagged by nfs_set_page_dirty.Returns 0 if the request
+ * was not tagged.
+ * May also return an error if the user signalled nfs_wait_on_request().
+ */
+static int nfs_page_mark_flush(struct page *page)
+{
+ struct nfs_page *req;
+ spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
+ int ret;
+
+ spin_lock(req_lock);
+ for(;;) {
+ req = nfs_page_find_request_locked(page);
+ if (req == NULL) {
+ spin_unlock(req_lock);
+ return 1;
+ }
+ if (nfs_lock_request_dontget(req))
+ break;
+ /* Note: If we hold the page lock, as is the case in nfs_writepage,
+ * then the call to nfs_lock_request_dontget() will always
+ * succeed provided that someone hasn't already marked the
+ * request as dirty (in which case we don't care).
+ */
+ spin_unlock(req_lock);
+ ret = nfs_wait_on_request(req);
+ nfs_release_request(req);
+ if (ret != 0)
+ return ret;
+ spin_lock(req_lock);
+ }
+ spin_unlock(req_lock);
+ if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) {
+ nfs_mark_request_dirty(req);
+ set_page_writeback(page);
+ }
+ ret = test_bit(PG_NEED_FLUSH, &req->wb_flags);
+ nfs_unlock_request(req);
+ return ret;
+}
+
/*
* Write an mmapped page to the server.
*/
-int nfs_writepage(struct page *page, struct writeback_control *wbc)
+static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
{
+ struct nfs_open_context *ctx;
struct inode *inode = page->mapping->host;
- unsigned long end_index;
- unsigned offset = PAGE_CACHE_SIZE;
- loff_t i_size = i_size_read(inode);
- int inode_referenced = 0;
- int priority = wb_priority(wbc);
+ unsigned offset;
int err;
- /*
- * Note: We need to ensure that we have a reference to the inode
- * if we are to do asynchronous writes. If not, waiting
- * in nfs_wait_on_request() may deadlock with clear_inode().
- *
- * If igrab() fails here, then it is in any case safe to
- * call nfs_wb_page(), since there will be no pending writes.
- */
- if (igrab(inode) != 0)
- inode_referenced = 1;
- end_index = i_size >> PAGE_CACHE_SHIFT;
-
- /* Ensure we've flushed out any previous writes */
- nfs_wb_page_priority(inode, page, priority);
-
- /* easy case */
- if (page->index < end_index)
- goto do_it;
- /* things got complicated... */
- offset = i_size & (PAGE_CACHE_SIZE-1);
-
- /* OK, are we completely out? */
- err = 0; /* potential race with truncate - ignore */
- if (page->index >= end_index+1 || !offset)
+ nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
+ nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
+
+ err = nfs_page_mark_flush(page);
+ if (err <= 0)
+ goto out;
+ err = 0;
+ offset = nfs_page_length(page);
+ if (!offset)
+ goto out;
+
+ ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE);
+ if (ctx == NULL) {
+ err = -EBADF;
goto out;
-do_it:
- lock_kernel();
- if (!IS_SYNC(inode) && inode_referenced) {
- err = nfs_writepage_async(NULL, inode, page, 0, offset);
- if (err >= 0) {
- err = 0;
- if (wbc->for_reclaim)
- err = WRITEPAGE_ACTIVATE;
- }
- } else {
- err = nfs_writepage_sync(NULL, inode, page, 0,
- offset, priority);
- if (err >= 0) {
- if (err != offset)
- redirty_page_for_writepage(wbc, page);
- err = 0;
- }
}
- unlock_kernel();
+ err = nfs_writepage_setup(ctx, page, 0, offset);
+ put_nfs_open_context(ctx);
+ if (err != 0)
+ goto out;
+ err = nfs_page_mark_flush(page);
+ if (err > 0)
+ err = 0;
out:
- if (err != WRITEPAGE_ACTIVATE)
- unlock_page(page);
- if (inode_referenced)
- iput(inode);
+ if (!wbc->for_writepages)
+ nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc));
+ return err;
+}
+
+int nfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ int err;
+
+ err = nfs_writepage_locked(page, wbc);
+ unlock_page(page);
return err;
}
struct inode *inode = mapping->host;
int err;
+ nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
+
err = generic_writepages(mapping, wbc);
if (err)
return err;
return 0;
nfs_wait_on_write_congestion(mapping, 0);
}
- err = nfs_flush_inode(inode, 0, 0, wb_priority(wbc));
+ err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc));
if (err < 0)
goto out;
- wbc->nr_to_write -= err;
+ nfs_add_stats(inode, NFSIOS_WRITEPAGES, err);
if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) {
err = nfs_wait_on_requests(inode, 0, 0);
if (err < 0)
goto out;
}
- err = nfs_commit_inode(inode, 0, 0, wb_priority(wbc));
- if (err > 0) {
- wbc->nr_to_write -= err;
+ err = nfs_commit_inode(inode, wb_priority(wbc));
+ if (err > 0)
err = 0;
- }
out:
clear_bit(BDI_write_congested, &bdi->state);
wake_up_all(&nfs_write_congestion);
+ congestion_end(WRITE);
return err;
}
/*
* Insert a write request into an inode
*/
-static inline int
-nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
+static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
{
struct nfs_inode *nfsi = NFS_I(inode);
int error;
if (!nfsi->npages) {
igrab(inode);
nfs_begin_data_update(inode);
+ if (nfs_have_delegation(inode, FMODE_WRITE))
+ nfsi->change_attr++;
}
+ SetPagePrivate(req->wb_page);
+ set_page_private(req->wb_page, (unsigned long)req);
nfsi->npages++;
- req->wb_count++;
+ atomic_inc(&req->wb_count);
return 0;
}
/*
* Insert a write request into an inode
*/
-static void
-nfs_inode_remove_request(struct nfs_page *req)
+static void nfs_inode_remove_request(struct nfs_page *req)
{
- struct nfs_inode *nfsi;
- struct inode *inode;
+ struct inode *inode = req->wb_context->dentry->d_inode;
+ struct nfs_inode *nfsi = NFS_I(inode);
BUG_ON (!NFS_WBACK_BUSY(req));
- spin_lock(&nfs_wreq_lock);
- inode = req->wb_inode;
- nfsi = NFS_I(inode);
+
+ spin_lock(&nfsi->req_lock);
+ set_page_private(req->wb_page, 0);
+ ClearPagePrivate(req->wb_page);
radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
nfsi->npages--;
if (!nfsi->npages) {
- spin_unlock(&nfs_wreq_lock);
- nfs_end_data_update_defer(inode);
+ spin_unlock(&nfsi->req_lock);
+ nfs_end_data_update(inode);
iput(inode);
} else
- spin_unlock(&nfs_wreq_lock);
+ spin_unlock(&nfsi->req_lock);
nfs_clear_request(req);
nfs_release_request(req);
}
-/*
- * Find a request
- */
-static inline struct nfs_page *
-_nfs_find_request(struct inode *inode, unsigned long index)
-{
- struct nfs_inode *nfsi = NFS_I(inode);
- struct nfs_page *req;
-
- req = (struct nfs_page*)radix_tree_lookup(&nfsi->nfs_page_tree, index);
- if (req)
- req->wb_count++;
- return req;
-}
-
-static struct nfs_page *
-nfs_find_request(struct inode *inode, unsigned long index)
-{
- struct nfs_page *req;
-
- spin_lock(&nfs_wreq_lock);
- req = _nfs_find_request(inode, index);
- spin_unlock(&nfs_wreq_lock);
- return req;
-}
-
/*
* Add a request to the inode's dirty list.
*/
static void
nfs_mark_request_dirty(struct nfs_page *req)
{
- struct inode *inode = req->wb_inode;
+ struct inode *inode = req->wb_context->dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(inode);
- spin_lock(&nfs_wreq_lock);
+ spin_lock(&nfsi->req_lock);
+ radix_tree_tag_set(&nfsi->nfs_page_tree,
+ req->wb_index, NFS_PAGE_TAG_DIRTY);
nfs_list_add_request(req, &nfsi->dirty);
nfsi->ndirty++;
- spin_unlock(&nfs_wreq_lock);
- inc_page_state(nr_dirty);
- mark_inode_dirty(inode);
+ spin_unlock(&nfsi->req_lock);
+ __mark_inode_dirty(inode, I_DIRTY_PAGES);
+}
+
+static void
+nfs_redirty_request(struct nfs_page *req)
+{
+ clear_bit(PG_FLUSHING, &req->wb_flags);
+ __set_page_dirty_nobuffers(req->wb_page);
}
/*
static inline int
nfs_dirty_request(struct nfs_page *req)
{
- struct nfs_inode *nfsi = NFS_I(req->wb_inode);
- return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty;
+ return test_bit(PG_FLUSHING, &req->wb_flags) == 0;
}
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
static void
nfs_mark_request_commit(struct nfs_page *req)
{
- struct inode *inode = req->wb_inode;
+ struct inode *inode = req->wb_context->dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(inode);
- spin_lock(&nfs_wreq_lock);
+ spin_lock(&nfsi->req_lock);
nfs_list_add_request(req, &nfsi->commit);
nfsi->ncommit++;
- spin_unlock(&nfs_wreq_lock);
- inc_page_state(nr_unstable);
- mark_inode_dirty(inode);
+ spin_unlock(&nfsi->req_lock);
+ inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
+ __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
}
#endif
*
* Interruptible by signals only if mounted with intr flag.
*/
-static int
-nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages)
+static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *req;
else
idx_end = idx_start + npages - 1;
- spin_lock(&nfs_wreq_lock);
next = idx_start;
- while (radix_tree_gang_lookup(&nfsi->nfs_page_tree, (void **)&req, next, 1)) {
+ while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) {
if (req->wb_index > idx_end)
break;
next = req->wb_index + 1;
- if (!NFS_WBACK_BUSY(req))
- continue;
+ BUG_ON(!NFS_WBACK_BUSY(req));
- req->wb_count++;
- spin_unlock(&nfs_wreq_lock);
+ atomic_inc(&req->wb_count);
+ spin_unlock(&nfsi->req_lock);
error = nfs_wait_on_request(req);
nfs_release_request(req);
+ spin_lock(&nfsi->req_lock);
if (error < 0)
return error;
- spin_lock(&nfs_wreq_lock);
res++;
}
- spin_unlock(&nfs_wreq_lock);
return res;
}
-/*
- * nfs_scan_dirty - Scan an inode for dirty requests
- * @inode: NFS inode to scan
- * @dst: destination list
- * @idx_start: lower bound of page->index to scan.
- * @npages: idx_start + npages sets the upper bound to scan.
- *
- * Moves requests from the inode's dirty page list.
- * The requests are *not* checked to ensure that they form a contiguous set.
- */
-static int
-nfs_scan_dirty(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
+static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages)
{
struct nfs_inode *nfsi = NFS_I(inode);
- int res;
- res = nfs_scan_list(&nfsi->dirty, 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");
- return res;
+ int ret;
+
+ spin_lock(&nfsi->req_lock);
+ ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
+ spin_unlock(&nfsi->req_lock);
+ 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);
+ }
}
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
{
struct nfs_inode *nfsi = NFS_I(inode);
- int res;
- res = nfs_scan_list(&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");
+ int res = 0;
+
+ if (nfsi->ncommit != 0) {
+ 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");
+ }
return res;
}
+#else
+static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
+{
+ return 0;
+}
#endif
static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr)
if (!bdi_write_congested(bdi))
return 0;
+
+ nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT);
+
if (intr) {
struct rpc_clnt *clnt = NFS_CLIENT(mapping->host);
sigset_t oldset;
*
* Note: Should always be called with the Page Lock held!
*/
-static struct nfs_page *
-nfs_update_request(struct file* file, struct inode *inode, struct page *page,
- unsigned int offset, unsigned int bytes)
+static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
+ struct page *page, unsigned int offset, unsigned int bytes)
{
- struct nfs_server *server = NFS_SERVER(inode);
+ struct inode *inode = page->mapping->host;
+ struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *req, *new = NULL;
unsigned long rqend, end;
end = offset + bytes;
- if (nfs_wait_on_write_congestion(page->mapping, server->flags & NFS_MOUNT_INTR))
+ if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR))
return ERR_PTR(-ERESTARTSYS);
for (;;) {
/* Loop over all inode entries and see if we find
* A request for the page we wish to update
*/
- spin_lock(&nfs_wreq_lock);
- req = _nfs_find_request(inode, page->index);
+ spin_lock(&nfsi->req_lock);
+ req = nfs_page_find_request_locked(page);
if (req) {
if (!nfs_lock_request_dontget(req)) {
int error;
- spin_unlock(&nfs_wreq_lock);
+
+ spin_unlock(&nfsi->req_lock);
error = nfs_wait_on_request(req);
nfs_release_request(req);
- if (error < 0)
+ if (error < 0) {
+ if (new)
+ nfs_release_request(new);
return ERR_PTR(error);
+ }
continue;
}
- spin_unlock(&nfs_wreq_lock);
+ spin_unlock(&nfsi->req_lock);
if (new)
nfs_release_request(new);
break;
nfs_lock_request_dontget(new);
error = nfs_inode_add_request(inode, new);
if (error) {
- spin_unlock(&nfs_wreq_lock);
+ spin_unlock(&nfsi->req_lock);
nfs_unlock_request(new);
return ERR_PTR(error);
}
- spin_unlock(&nfs_wreq_lock);
- nfs_mark_request_dirty(new);
+ spin_unlock(&nfsi->req_lock);
return new;
}
- spin_unlock(&nfs_wreq_lock);
+ spin_unlock(&nfsi->req_lock);
- new = nfs_create_request(file, inode, page, offset, bytes);
+ new = nfs_create_request(ctx, inode, page, offset, bytes);
if (IS_ERR(new))
return new;
- if (file) {
- new->wb_file = file;
- get_file(file);
- }
}
/* We have a request for our page.
* request.
*/
rqend = req->wb_offset + req->wb_bytes;
- if (req->wb_file != file
+ if (req->wb_context != ctx
|| req->wb_page != page
|| !nfs_dirty_request(req)
|| offset > rqend || end < req->wb_offset) {
return req;
}
-int
-nfs_flush_incompatible(struct file *file, struct page *page)
+int nfs_flush_incompatible(struct file *file, struct page *page)
{
- struct inode *inode = page->mapping->host;
+ struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
struct nfs_page *req;
- int status = 0;
+ int do_flush, status;
/*
* Look for a request corresponding to this page. If there
* is one, and it belongs to another file, we flush it out
* Also do the same if we find a request from an existing
* dropped page.
*/
- req = nfs_find_request(inode, page->index);
- if (req) {
- if (!NFS_PROTO(inode)->request_compatible(req, file, page))
- status = nfs_wb_page(inode, page);
+ do {
+ req = nfs_page_find_request(page);
+ if (req == NULL)
+ return 0;
+ do_flush = req->wb_page != page || req->wb_context != ctx
+ || !nfs_dirty_request(req);
nfs_release_request(req);
- }
- return (status < 0) ? status : 0;
+ if (!do_flush)
+ return 0;
+ status = nfs_wb_page(page->mapping->host, page);
+ } while (status == 0);
+ return status;
}
/*
int nfs_updatepage(struct file *file, struct page *page,
unsigned int offset, unsigned int count)
{
- struct dentry *dentry = file->f_dentry;
+ struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
struct inode *inode = page->mapping->host;
- struct nfs_page *req;
int status = 0;
+ nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
+
dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
- dentry->d_parent->d_name.name, dentry->d_name.name,
- count, (long long)(page_offset(page) +offset));
-
- if (IS_SYNC(inode)) {
- status = nfs_writepage_sync(file, inode, page, offset, count, 0);
- if (status > 0) {
- if (offset == 0 && status == PAGE_CACHE_SIZE)
- SetPageUptodate(page);
- return 0;
- }
- return status;
- }
+ file->f_path.dentry->d_parent->d_name.name,
+ file->f_path.dentry->d_name.name, count,
+ (long long)(page_offset(page) +offset));
/* If we're not using byte range locks, and we know the page
* is entirely in cache, it may be more efficient to avoid
* fragmenting write requests.
*/
- if (PageUptodate(page) && inode->i_flock == NULL) {
- loff_t end_offs = i_size_read(inode) - 1;
- unsigned long end_index = end_offs >> PAGE_CACHE_SHIFT;
-
- count += offset;
+ if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) {
+ count = max(count + offset, nfs_page_length(page));
offset = 0;
- if (unlikely(end_offs < 0)) {
- /* Do nothing */
- } else if (page->index == end_index) {
- unsigned int pglen;
- pglen = (unsigned int)(end_offs & (PAGE_CACHE_SIZE-1)) + 1;
- if (count < pglen)
- count = pglen;
- } else if (page->index < end_index)
- count = PAGE_CACHE_SIZE;
}
- /*
- * Try to find an NFS request corresponding to this page
- * and update it.
- * If the existing request cannot be updated, we must flush
- * it out now.
- */
- do {
- req = nfs_update_request(file, inode, page, offset, count);
- status = (IS_ERR(req)) ? PTR_ERR(req) : 0;
- if (status != -EBUSY)
- break;
- /* Request could not be updated. Flush it out and try again */
- status = nfs_wb_page(inode, page);
- } while (status >= 0);
- if (status < 0)
- goto done;
-
- status = 0;
+ status = nfs_writepage_setup(ctx, page, offset, count);
+ __set_page_dirty_nobuffers(page);
- /* Update file length */
- nfs_grow_file(page, offset, count);
- /* Set the PG_uptodate flag? */
- nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
- nfs_unlock_request(req);
-done:
dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
status, (long long)i_size_read(inode));
if (status < 0)
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
if (!PageError(req->wb_page)) {
if (NFS_NEED_RESCHED(req)) {
- nfs_mark_request_dirty(req);
+ nfs_redirty_request(req);
goto out;
} else if (NFS_NEED_COMMIT(req)) {
nfs_mark_request_commit(req);
#else
nfs_inode_remove_request(req);
#endif
- nfs_unlock_request(req);
+ nfs_clear_page_writeback(req);
}
static inline int flush_task_priority(int how)
*/
static void nfs_write_rpcsetup(struct nfs_page *req,
struct nfs_write_data *data,
+ const struct rpc_call_ops *call_ops,
unsigned int count, unsigned int offset,
int how)
{
- struct rpc_task *task = &data->task;
struct inode *inode;
+ int flags;
/* Set up the RPC argument and reply structs
* NB: take care not to mess about with data->commit et al. */
data->req = req;
- data->inode = inode = req->wb_inode;
- data->cred = req->wb_cred;
+ data->inode = inode = req->wb_context->dentry->d_inode;
+ data->cred = req->wb_context->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.lockowner = req->wb_lockowner;
- data->args.state = req->wb_state;
+ data->args.context = req->wb_context;
data->res.fattr = &data->fattr;
data->res.count = count;
data->res.verf = &data->verf;
+ nfs_fattr_init(&data->fattr);
+ /* Set up the initial task struct. */
+ flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
+ rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data);
NFS_PROTO(inode)->write_setup(data, how);
data->task.tk_priority = flush_task_priority(how);
data->task.tk_cookie = (unsigned long)inode;
- data->task.tk_calldata = data;
- /* Release requests */
- data->task.tk_release = nfs_writedata_release;
dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n",
- task->tk_pid,
+ data->task.tk_pid,
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
count,
sigset_t oldset;
rpc_clnt_sigmask(clnt, &oldset);
- lock_kernel();
rpc_execute(&data->task);
- unlock_kernel();
rpc_clnt_sigunmask(clnt, &oldset);
}
* Generate multiple small requests to write out a single
* contiguous dirty area on one page.
*/
-static int nfs_flush_multi(struct list_head *head, struct inode *inode, int how)
+static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how)
{
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();
+ 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);
- SetPageWriteback(page);
offset = 0;
nbytes = req->wb_bytes;
do {
list_del_init(&data->pages);
data->pagevec[0] = page;
- data->complete = nfs_writeback_done_partial;
if (nbytes > wsize) {
- nfs_write_rpcsetup(req, data, wsize, offset, how);
+ nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
+ wsize, offset, how);
offset += wsize;
nbytes -= wsize;
} else {
- nfs_write_rpcsetup(req, data, nbytes, offset, how);
+ nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
+ nbytes, offset, how);
nbytes = 0;
}
nfs_execute_write(data);
while (!list_empty(&list)) {
data = list_entry(list.next, struct nfs_write_data, pages);
list_del(&data->pages);
- nfs_writedata_free(data);
+ nfs_writedata_release(data);
}
- nfs_mark_request_dirty(req);
- nfs_unlock_request(req);
+ nfs_redirty_request(req);
+ nfs_clear_page_writeback(req);
return -ENOMEM;
}
* This is the case if nfs_updatepage detects a conflicting request
* that has been written but not committed.
*/
-static int nfs_flush_one(struct list_head *head, struct inode *inode, int how)
+static int nfs_flush_one(struct inode *inode, struct list_head *head, int how)
{
struct nfs_page *req;
struct page **pages;
struct nfs_write_data *data;
unsigned int count;
- if (NFS_SERVER(inode)->wsize < PAGE_CACHE_SIZE)
- return nfs_flush_multi(head, inode, how);
-
- data = nfs_writedata_alloc();
+ data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize);
if (!data)
goto out_bad;
nfs_list_remove_request(req);
nfs_list_add_request(req, &data->pages);
ClearPageError(req->wb_page);
- SetPageWriteback(req->wb_page);
*pages++ = req->wb_page;
count += req->wb_bytes;
}
req = nfs_list_entry(data->pages.next);
- data->complete = nfs_writeback_done_full;
/* Set up the argument struct */
- nfs_write_rpcsetup(req, data, count, 0, how);
+ nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how);
nfs_execute_write(data);
return 0;
while (!list_empty(head)) {
struct nfs_page *req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
- nfs_mark_request_dirty(req);
- nfs_unlock_request(req);
+ nfs_redirty_request(req);
+ nfs_clear_page_writeback(req);
}
return -ENOMEM;
}
-int
-nfs_flush_list(struct list_head *head, int wpages, int how)
+static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how)
{
LIST_HEAD(one_request);
- struct nfs_page *req;
- int error = 0;
- unsigned int pages = 0;
+ int (*flush_one)(struct inode *, struct list_head *, int);
+ struct nfs_page *req;
+ int wpages = NFS_SERVER(inode)->wpages;
+ int wsize = NFS_SERVER(inode)->wsize;
+ int error;
- while (!list_empty(head)) {
- pages += nfs_coalesce_requests(head, &one_request, wpages);
+ flush_one = nfs_flush_one;
+ if (wsize < PAGE_CACHE_SIZE)
+ flush_one = nfs_flush_multi;
+ /* For single writes, FLUSH_STABLE is more efficient */
+ if (npages <= wpages && npages == NFS_I(inode)->npages
+ && nfs_list_entry(head->next)->wb_bytes <= wsize)
+ how |= FLUSH_STABLE;
+
+ do {
+ nfs_coalesce_requests(head, &one_request, wpages);
req = nfs_list_entry(one_request.next);
- error = nfs_flush_one(&one_request, req->wb_inode, how);
+ error = flush_one(inode, &one_request, how);
if (error < 0)
- break;
- }
- if (error >= 0)
- return pages;
-
+ goto out_err;
+ } while (!list_empty(head));
+ return 0;
+out_err:
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
- nfs_mark_request_dirty(req);
- nfs_unlock_request(req);
+ nfs_redirty_request(req);
+ nfs_clear_page_writeback(req);
}
return error;
}
/*
* Handle a write reply that flushed part of a page.
*/
-static void nfs_writeback_done_partial(struct nfs_write_data *data, int status)
+static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
{
+ struct nfs_write_data *data = calldata;
struct nfs_page *req = data->req;
struct page *page = req->wb_page;
dprintk("NFS: write (%s/%Ld %d@%Ld)",
- req->wb_inode->i_sb->s_id,
- (long long)NFS_FILEID(req->wb_inode),
+ req->wb_context->dentry->d_inode->i_sb->s_id,
+ (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
req->wb_bytes,
(long long)req_offset(req));
- if (status < 0) {
+ if (nfs_writeback_done(task, data) != 0)
+ return;
+
+ if (task->tk_status < 0) {
ClearPageUptodate(page);
SetPageError(page);
- if (req->wb_file)
- req->wb_file->f_error = status;
- dprintk(", error = %d\n", status);
+ req->wb_context->error = task->tk_status;
+ dprintk(", error = %d\n", task->tk_status);
} else {
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
if (data->verf.committed < NFS_FILE_SYNC) {
nfs_writepage_release(req);
}
+static const struct rpc_call_ops nfs_write_partial_ops = {
+ .rpc_call_done = nfs_writeback_done_partial,
+ .rpc_release = nfs_writedata_release,
+};
+
/*
* Handle a write reply that flushes a whole page.
*
* writebacks since the page->count is kept > 1 for as long
* as the page has a write request pending.
*/
-static void nfs_writeback_done_full(struct nfs_write_data *data, int status)
+static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
{
+ struct nfs_write_data *data = calldata;
struct nfs_page *req;
struct page *page;
+ if (nfs_writeback_done(task, data) != 0)
+ return;
+
/* Update attributes as result of writeback. */
while (!list_empty(&data->pages)) {
req = nfs_list_entry(data->pages.next);
page = req->wb_page;
dprintk("NFS: write (%s/%Ld %d@%Ld)",
- req->wb_inode->i_sb->s_id,
- (long long)NFS_FILEID(req->wb_inode),
+ req->wb_context->dentry->d_inode->i_sb->s_id,
+ (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
req->wb_bytes,
(long long)req_offset(req));
- if (status < 0) {
+ if (task->tk_status < 0) {
ClearPageUptodate(page);
SetPageError(page);
- if (req->wb_file)
- req->wb_file->f_error = status;
+ req->wb_context->error = task->tk_status;
end_page_writeback(page);
nfs_inode_remove_request(req);
- dprintk(", error = %d\n", status);
+ dprintk(", error = %d\n", task->tk_status);
goto next;
}
end_page_writeback(page);
nfs_inode_remove_request(req);
#endif
next:
- nfs_unlock_request(req);
+ nfs_clear_page_writeback(req);
}
}
+static const struct rpc_call_ops nfs_write_full_ops = {
+ .rpc_call_done = nfs_writeback_done_full,
+ .rpc_release = nfs_writedata_release,
+};
+
+
/*
* This function is called when the WRITE call is complete.
*/
-void nfs_writeback_done(struct rpc_task *task)
+int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
{
- struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
struct nfs_writeargs *argp = &data->args;
struct nfs_writeres *resp = &data->res;
+ int status;
dprintk("NFS: %4d nfs_writeback_done (status %d)\n",
task->tk_pid, task->tk_status);
+ /*
+ * ->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;
+ nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
+
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
/* We tried a write call, but the server did not
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;
}
if (task->tk_status >= 0 && resp->count < argp->count) {
static unsigned long complain;
+ nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
+
/* Has the server at least made some progress? */
if (resp->count != 0) {
/* Was this an NFSv2 write or an NFSv3 stable write? */
argp->stable = NFS_FILE_SYNC;
}
rpc_restart_call(task);
- return;
+ return -EAGAIN;
}
if (time_before(complain, jiffies)) {
printk(KERN_WARNING
- "NFS: Server wrote less than requested.\n");
+ "NFS: Server wrote zero bytes, expected %u.\n",
+ argp->count);
complain = jiffies + 300 * HZ;
}
/* Can't do anything about it except throw an error. */
task->tk_status = -EIO;
}
-
- /*
- * Process the nfs_page list
- */
- data->complete(data, task->tk_status);
+ return 0;
}
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
-static void nfs_commit_release(struct rpc_task *task)
+void nfs_commit_release(void *wdata)
{
- struct nfs_write_data *wdata = (struct nfs_write_data *)task->tk_calldata;
nfs_commit_free(wdata);
}
* Set up the argument/result storage required for the RPC call.
*/
static void nfs_commit_rpcsetup(struct list_head *head,
- struct nfs_write_data *data, int how)
+ struct nfs_write_data *data,
+ int how)
{
- struct rpc_task *task = &data->task;
- struct nfs_page *first, *last;
+ struct nfs_page *first;
struct inode *inode;
- loff_t start, end, len;
+ int flags;
/* Set up the RPC argument and reply structs
* NB: take care not to mess about with data->commit et al. */
list_splice_init(head, &data->pages);
first = nfs_list_entry(data->pages.next);
- last = nfs_list_entry(data->pages.prev);
- inode = first->wb_inode;
-
- /*
- * Determine the offset range of requests in the COMMIT call.
- * We rely on the fact that data->pages is an ordered list...
- */
- start = req_offset(first);
- end = req_offset(last) + last->wb_bytes;
- len = end - start;
- /* If 'len' is not a 32-bit quantity, pass '0' in the COMMIT call */
- if (end >= i_size_read(inode) || len < 0 || len > (~((u32)0) >> 1))
- len = 0;
+ inode = first->wb_context->dentry->d_inode;
data->inode = inode;
- data->cred = first->wb_cred;
+ data->cred = first->wb_context->cred;
data->args.fh = NFS_FH(data->inode);
- data->args.offset = start;
- data->args.count = len;
- data->res.count = len;
+ /* Note: we always request a commit of the entire inode */
+ data->args.offset = 0;
+ data->args.count = 0;
+ data->res.count = 0;
data->res.fattr = &data->fattr;
data->res.verf = &data->verf;
-
+ nfs_fattr_init(&data->fattr);
+
+ /* Set up the initial task struct. */
+ flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
+ rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data);
NFS_PROTO(inode)->commit_setup(data, how);
data->task.tk_priority = flush_task_priority(how);
data->task.tk_cookie = (unsigned long)inode;
- data->task.tk_calldata = data;
- /* Release requests */
- data->task.tk_release = nfs_commit_release;
- dprintk("NFS: %4d initiated commit call\n", task->tk_pid);
+ dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid);
}
/*
* Commit dirty pages
*/
-int
-nfs_commit_list(struct list_head *head, int how)
+static int
+nfs_commit_list(struct inode *inode, struct list_head *head, int how)
{
struct nfs_write_data *data;
struct nfs_page *req;
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
nfs_mark_request_commit(req);
- nfs_unlock_request(req);
+ dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
+ nfs_clear_page_writeback(req);
}
return -ENOMEM;
}
/*
* COMMIT call returned
*/
-void
-nfs_commit_done(struct rpc_task *task)
+static void nfs_commit_done(struct rpc_task *task, void *calldata)
{
- struct nfs_write_data *data = (struct nfs_write_data *)task->tk_calldata;
+ 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);
+ /* Call the NFS version-specific code */
+ if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
+ return;
+
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_inode->i_sb->s_id,
- (long long)NFS_FILEID(req->wb_inode),
+ req->wb_context->dentry->d_inode->i_sb->s_id,
+ (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
req->wb_bytes,
(long long)req_offset(req));
if (task->tk_status < 0) {
- if (req->wb_file)
- req->wb_file->f_error = task->tk_status;
+ req->wb_context->error = task->tk_status;
nfs_inode_remove_request(req);
dprintk(", error = %d\n", task->tk_status);
goto next;
}
/* We have a mismatch. Write the page again */
dprintk(" mismatch\n");
- nfs_mark_request_dirty(req);
+ nfs_redirty_request(req);
next:
- nfs_unlock_request(req);
- res++;
+ nfs_clear_page_writeback(req);
}
- sub_page_state(nr_unstable,res);
+}
+
+static const struct rpc_call_ops nfs_commit_ops = {
+ .rpc_call_done = nfs_commit_done,
+ .rpc_release = nfs_commit_release,
+};
+#else
+static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
+{
+ return 0;
}
#endif
-int nfs_flush_inode(struct inode *inode, unsigned long idx_start,
- unsigned int npages, int how)
+static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
{
+ struct nfs_inode *nfsi = NFS_I(mapping->host);
LIST_HEAD(head);
- int res,
- error = 0;
-
- spin_lock(&nfs_wreq_lock);
- res = nfs_scan_dirty(inode, &head, idx_start, npages);
- spin_unlock(&nfs_wreq_lock);
- if (res)
- error = nfs_flush_list(&head, NFS_SERVER(inode)->wpages, how);
- if (error < 0)
- return error;
+ long res;
+
+ spin_lock(&nfsi->req_lock);
+ res = nfs_scan_dirty(mapping, wbc, &head);
+ spin_unlock(&nfsi->req_lock);
+ if (res) {
+ int error = nfs_flush_list(mapping->host, &head, res, how);
+ if (error < 0)
+ return error;
+ }
return res;
}
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
-int nfs_commit_inode(struct inode *inode, unsigned long idx_start,
- unsigned int npages, int how)
+int nfs_commit_inode(struct inode *inode, int how)
{
+ struct nfs_inode *nfsi = NFS_I(inode);
LIST_HEAD(head);
- int res,
- error = 0;
+ int res;
- spin_lock(&nfs_wreq_lock);
- res = nfs_scan_commit(inode, &head, idx_start, npages);
+ spin_lock(&nfsi->req_lock);
+ res = nfs_scan_commit(inode, &head, 0, 0);
+ spin_unlock(&nfsi->req_lock);
if (res) {
- res += nfs_scan_commit(inode, &head, 0, 0);
- spin_unlock(&nfs_wreq_lock);
- error = nfs_commit_list(&head, how);
- } else
- spin_unlock(&nfs_wreq_lock);
- if (error < 0)
- return error;
+ int error = nfs_commit_list(inode, &head, how);
+ if (error < 0)
+ return error;
+ }
return res;
}
#endif
-int nfs_sync_inode(struct inode *inode, unsigned long idx_start,
- unsigned int npages, int how)
+long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
+{
+ struct inode *inode = mapping->host;
+ struct nfs_inode *nfsi = NFS_I(inode);
+ unsigned long idx_start, idx_end;
+ unsigned int npages = 0;
+ LIST_HEAD(head);
+ int nocommit = how & FLUSH_NOCOMMIT;
+ long pages, ret;
+
+ /* FIXME */
+ if (wbc->range_cyclic)
+ idx_start = 0;
+ else {
+ idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
+ idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
+ if (idx_end > idx_start) {
+ unsigned long l_npages = 1 + idx_end - idx_start;
+ npages = l_npages;
+ if (sizeof(npages) != sizeof(l_npages) &&
+ (unsigned long)npages != l_npages)
+ npages = 0;
+ }
+ }
+ how &= ~FLUSH_NOCOMMIT;
+ spin_lock(&nfsi->req_lock);
+ do {
+ wbc->pages_skipped = 0;
+ ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
+ if (ret != 0)
+ continue;
+ pages = nfs_scan_dirty(mapping, wbc, &head);
+ if (pages != 0) {
+ spin_unlock(&nfsi->req_lock);
+ if (how & FLUSH_INVALIDATE) {
+ nfs_cancel_dirty_list(&head);
+ ret = pages;
+ } else
+ ret = nfs_flush_list(inode, &head, pages, how);
+ spin_lock(&nfsi->req_lock);
+ continue;
+ }
+ if (wbc->pages_skipped != 0)
+ continue;
+ if (nocommit)
+ break;
+ pages = nfs_scan_commit(inode, &head, idx_start, npages);
+ if (pages == 0) {
+ if (wbc->pages_skipped != 0)
+ continue;
+ break;
+ }
+ if (how & FLUSH_INVALIDATE) {
+ spin_unlock(&nfsi->req_lock);
+ nfs_cancel_commit_list(&head);
+ ret = pages;
+ 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);
+ } while (ret >= 0);
+ spin_unlock(&nfsi->req_lock);
+ return ret;
+}
+
+/*
+ * flush the inode to disk.
+ */
+int nfs_wb_all(struct inode *inode)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct writeback_control wbc = {
+ .bdi = mapping->backing_dev_info,
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = LONG_MAX,
+ .for_writepages = 1,
+ .range_cyclic = 1,
+ };
+ int ret;
+
+ ret = generic_writepages(mapping, &wbc);
+ if (ret < 0)
+ goto out;
+ ret = nfs_sync_mapping_wait(mapping, &wbc, 0);
+ if (ret >= 0)
+ return 0;
+out:
+ __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+ return ret;
+}
+
+int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how)
{
- int error,
- wait;
+ struct writeback_control wbc = {
+ .bdi = mapping->backing_dev_info,
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = LONG_MAX,
+ .range_start = range_start,
+ .range_end = range_end,
+ .for_writepages = 1,
+ };
+ int ret;
- wait = how & FLUSH_WAIT;
- how &= ~FLUSH_WAIT;
+ if (!(how & FLUSH_NOWRITEPAGE)) {
+ ret = generic_writepages(mapping, &wbc);
+ if (ret < 0)
+ goto out;
+ }
+ ret = nfs_sync_mapping_wait(mapping, &wbc, how);
+ if (ret >= 0)
+ return 0;
+out:
+ __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+ return ret;
+}
- do {
- error = 0;
- if (wait)
- error = nfs_wait_on_requests(inode, idx_start, npages);
- if (error == 0)
- error = nfs_flush_inode(inode, idx_start, npages, how);
-#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
- if (error == 0)
- error = nfs_commit_inode(inode, idx_start, npages, how);
-#endif
- } while (error > 0);
- return error;
+int nfs_wb_page_priority(struct inode *inode, struct page *page, int how)
+{
+ loff_t range_start = page_offset(page);
+ loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
+ struct writeback_control wbc = {
+ .bdi = page->mapping->backing_dev_info,
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = LONG_MAX,
+ .range_start = range_start,
+ .range_end = range_end,
+ };
+ int ret;
+
+ BUG_ON(!PageLocked(page));
+ if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) {
+ ret = nfs_writepage_locked(page, &wbc);
+ if (ret < 0)
+ goto out;
+ }
+ ret = nfs_sync_mapping_wait(page->mapping, &wbc, how);
+ if (ret >= 0)
+ return 0;
+out:
+ __mark_inode_dirty(inode, I_DIRTY_PAGES);
+ return ret;
+}
+
+/*
+ * Write back all requests on one page - we do this before reading it.
+ */
+int nfs_wb_page(struct inode *inode, struct page* page)
+{
+ return nfs_wb_page_priority(inode, page, FLUSH_STABLE);
+}
+
+int nfs_set_page_dirty(struct page *page)
+{
+ struct nfs_page *req;
+
+ req = nfs_page_find_request(page);
+ if (req != NULL) {
+ /* Mark any existing write requests for flushing */
+ set_bit(PG_NEED_FLUSH, &req->wb_flags);
+ nfs_release_request(req);
+ }
+ return __set_page_dirty_nobuffers(page);
}
-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),
if (nfs_wdata_cachep == NULL)
return -ENOMEM;
- nfs_wdata_mempool = mempool_create(MIN_POOL_WRITE,
- mempool_alloc_slab,
- mempool_free_slab,
- nfs_wdata_cachep);
+ nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
+ nfs_wdata_cachep);
if (nfs_wdata_mempool == NULL)
return -ENOMEM;
- nfs_commit_mempool = mempool_create(MIN_POOL_COMMIT,
- mempool_alloc_slab,
- mempool_free_slab,
- nfs_wdata_cachep);
+ nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
+ nfs_wdata_cachep);
if (nfs_commit_mempool == NULL)
return -ENOMEM;
{
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);
}
git://git.onelab.eu / linux-2.6.git / blobdiff