/*
* linux/fs/nfs/write.c
*
- * Writing file data over NFS.
- *
- * We do it like this: When a (user) process wishes to write data to an
- * NFS file, a write request is allocated that contains the RPC task data
- * plus some info on the page to be written, and added to the inode's
- * write chain. If the process writes past the end of the page, an async
- * RPC call to write the page is scheduled immediately; otherwise, the call
- * is delayed for a few seconds.
- *
- * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE.
- *
- * Write requests are kept on the inode's writeback list. Each entry in
- * that list references the page (portion) to be written. When the
- * cache timeout has expired, the RPC task is woken up, and tries to
- * lock the page. As soon as it manages to do so, the request is moved
- * from the writeback list to the writelock list.
- *
- * Note: we must make sure never to confuse the inode passed in the
- * write_page request with the one in page->inode. As far as I understand
- * it, these are different when doing a swap-out.
- *
- * To understand everything that goes on here and in the NFS read code,
- * one should be aware that a page is locked in exactly one of the following
- * cases:
- *
- * - A write request is in progress.
- * - A user process is in generic_file_write/nfs_update_page
- * - A user process is in generic_file_read
- *
- * Also note that because of the way pages are invalidated in
- * nfs_revalidate_inode, the following assertions hold:
- *
- * - If a page is dirty, there will be no read requests (a page will
- * not be re-read unless invalidated by nfs_revalidate_inode).
- * - If the page is not uptodate, there will be no pending write
- * requests, and no process will be in nfs_update_page.
- *
- * FIXME: Interaction with the vmscan routines is not optimal yet.
- * Either vmscan must be made nfs-savvy, or we need a different page
- * reclaim concept that supports something like FS-independent
- * buffer_heads with a b_ops-> field.
+ * Write file data over NFS.
*
* Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
*/
unsigned int, unsigned 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;
i_size_write(inode, end);
}
+/* A writeback failed: mark the page as bad, and invalidate the page cache */
+static void nfs_set_pageerror(struct page *page)
+{
+ SetPageError(page);
+ nfs_zap_mapping(page->mapping->host, page->mapping);
+}
+
/* We can set the PG_uptodate flag if we see that a write request
* covers the full page.
*/
err = 0;
out:
if (!wbc->for_writepages)
- nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc));
+ nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|wb_priority(wbc));
return err;
}
if (err < 0)
goto out;
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, wb_priority(wbc));
- if (err > 0)
- err = 0;
+ err = 0;
out:
clear_bit(BDI_write_congested, &bdi->state);
wake_up_all(&nfs_write_congestion);
return res;
}
-static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages)
-{
- struct nfs_inode *nfsi = NFS_I(inode);
- 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;
nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
- file->f_dentry->d_parent->d_name.name,
- file->f_dentry->d_name.name, count,
+ 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
dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
status, (long long)i_size_read(inode));
if (status < 0)
- ClearPageUptodate(page);
+ nfs_set_pageerror(page);
return status;
}
data->task.tk_priority = flush_task_priority(how);
data->task.tk_cookie = (unsigned long)inode;
- dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n",
+ dprintk("NFS: %5u initiated write call "
+ "(req %s/%Ld, %u bytes @ offset %Lu)\n",
data->task.tk_pid,
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
return;
if (task->tk_status < 0) {
- ClearPageUptodate(page);
- SetPageError(page);
+ nfs_set_pageerror(page);
req->wb_context->error = task->tk_status;
dprintk(", error = %d\n", task->tk_status);
} else {
(long long)req_offset(req));
if (task->tk_status < 0) {
- ClearPageUptodate(page);
- SetPageError(page);
+ nfs_set_pageerror(page);
req->wb_context->error = task->tk_status;
end_page_writeback(page);
nfs_inode_remove_request(req);
struct nfs_writeres *resp = &data->res;
int status;
- dprintk("NFS: %4d nfs_writeback_done (status %d)\n",
+ dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
task->tk_pid, task->tk_status);
/*
data->task.tk_priority = flush_task_priority(how);
data->task.tk_cookie = (unsigned long)inode;
- dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid);
+ dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
}
/*
struct nfs_write_data *data = calldata;
struct nfs_page *req;
- dprintk("NFS: %4d nfs_commit_done (status %d)\n",
+ dprintk("NFS: %5u nfs_commit_done (status %d)\n",
task->tk_pid, task->tk_status);
/* Call the NFS version-specific code */
if (ret < 0)
goto out;
}
+ if (!PagePrivate(page))
+ return 0;
ret = nfs_sync_mapping_wait(page->mapping, &wbc, how);
if (ret >= 0)
return 0;
projects / powerpc.git / blobdiff