Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 305 insertions, 0 deletions

diff --git a/fs/afs/file.c b/fs/afs/file.c
new file mode 100644
index 000000000000..6b6bb7c8abf6
--- /dev/null
+++ b/fs/afs/file.c
@@ -0,0 +1,305 @@
+/* file.c: AFS filesystem file handling
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include "volume.h"
+#include "vnode.h"
+#include <rxrpc/call.h>
+#include "internal.h"
+
+#if 0
+static int afs_file_open(struct inode *inode, struct file *file);
+static int afs_file_release(struct inode *inode, struct file *file);
+#endif
+
+static int afs_file_readpage(struct file *file, struct page *page);
+static int afs_file_invalidatepage(struct page *page, unsigned long offset);
+static int afs_file_releasepage(struct page *page, int gfp_flags);
+
+static ssize_t afs_file_write(struct file *file, const char __user *buf,
+			      size_t size, loff_t *off);
+
+struct inode_operations afs_file_inode_operations = {
+	.getattr	= afs_inode_getattr,
+};
+
+struct file_operations afs_file_file_operations = {
+	.read		= generic_file_read,
+	.write		= afs_file_write,
+	.mmap		= generic_file_mmap,
+#if 0
+	.open		= afs_file_open,
+	.release	= afs_file_release,
+	.fsync		= afs_file_fsync,
+#endif
+};
+
+struct address_space_operations afs_fs_aops = {
+	.readpage	= afs_file_readpage,
+	.sync_page	= block_sync_page,
+	.set_page_dirty	= __set_page_dirty_nobuffers,
+	.releasepage	= afs_file_releasepage,
+	.invalidatepage	= afs_file_invalidatepage,
+};
+
+/*****************************************************************************/
+/*
+ * AFS file write
+ */
+static ssize_t afs_file_write(struct file *file, const char __user *buf,
+			      size_t size, loff_t *off)
+{
+	struct afs_vnode *vnode;
+
+	vnode = AFS_FS_I(file->f_dentry->d_inode);
+	if (vnode->flags & AFS_VNODE_DELETED)
+		return -ESTALE;
+
+	return -EIO;
+} /* end afs_file_write() */
+
+/*****************************************************************************/
+/*
+ * deal with notification that a page was read from the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_file_readpage_read_complete(void *cookie_data,
+					    struct page *page,
+					    void *data,
+					    int error)
+{
+	_enter("%p,%p,%p,%d", cookie_data, page, data, error);
+
+	if (error)
+		SetPageError(page);
+	else
+		SetPageUptodate(page);
+	unlock_page(page);
+
+} /* end afs_file_readpage_read_complete() */
+#endif
+
+/*****************************************************************************/
+/*
+ * deal with notification that a page was written to the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_file_readpage_write_complete(void *cookie_data,
+					     struct page *page,
+					     void *data,
+					     int error)
+{
+	_enter("%p,%p,%p,%d", cookie_data, page, data, error);
+
+	unlock_page(page);
+
+} /* end afs_file_readpage_write_complete() */
+#endif
+
+/*****************************************************************************/
+/*
+ * AFS read page from file (or symlink)
+ */
+static int afs_file_readpage(struct file *file, struct page *page)
+{
+	struct afs_rxfs_fetch_descriptor desc;
+#ifdef AFS_CACHING_SUPPORT
+	struct cachefs_page *pageio;
+#endif
+	struct afs_vnode *vnode;
+	struct inode *inode;
+	int ret;
+
+	inode = page->mapping->host;
+
+	_enter("{%lu},{%lu}", inode->i_ino, page->index);
+
+	vnode = AFS_FS_I(inode);
+
+	if (!PageLocked(page))
+		PAGE_BUG(page);
+
+	ret = -ESTALE;
+	if (vnode->flags & AFS_VNODE_DELETED)
+		goto error;
+
+#ifdef AFS_CACHING_SUPPORT
+	ret = cachefs_page_get_private(page, &pageio, GFP_NOIO);
+	if (ret < 0)
+		goto error;
+
+	/* is it cached? */
+	ret = cachefs_read_or_alloc_page(vnode->cache,
+					 page,
+					 afs_file_readpage_read_complete,
+					 NULL,
+					 GFP_KERNEL);
+#else
+	ret = -ENOBUFS;
+#endif
+
+	switch (ret) {
+		/* read BIO submitted and wb-journal entry found */
+	case 1:
+		BUG(); // TODO - handle wb-journal match
+
+		/* read BIO submitted (page in cache) */
+	case 0:
+		break;
+
+		/* no page available in cache */
+	case -ENOBUFS:
+	case -ENODATA:
+	default:
+		desc.fid	= vnode->fid;
+		desc.offset	= page->index << PAGE_CACHE_SHIFT;
+		desc.size	= min((size_t) (inode->i_size - desc.offset),
+				      (size_t) PAGE_SIZE);
+		desc.buffer	= kmap(page);
+
+		clear_page(desc.buffer);
+
+		/* read the contents of the file from the server into the
+		 * page */
+		ret = afs_vnode_fetch_data(vnode, &desc);
+		kunmap(page);
+		if (ret < 0) {
+			if (ret==-ENOENT) {
+				_debug("got NOENT from server"
+				       " - marking file deleted and stale");
+				vnode->flags |= AFS_VNODE_DELETED;
+				ret = -ESTALE;
+			}
+
+#ifdef AFS_CACHING_SUPPORT
+			cachefs_uncache_page(vnode->cache, page);
+#endif
+			goto error;
+		}
+
+		SetPageUptodate(page);
+
+#ifdef AFS_CACHING_SUPPORT
+		if (cachefs_write_page(vnode->cache,
+				       page,
+				       afs_file_readpage_write_complete,
+				       NULL,
+				       GFP_KERNEL) != 0
+		    ) {
+			cachefs_uncache_page(vnode->cache, page);
+			unlock_page(page);
+		}
+#else
+		unlock_page(page);
+#endif
+	}
+
+	_leave(" = 0");
+	return 0;
+
+ error:
+	SetPageError(page);
+	unlock_page(page);
+
+	_leave(" = %d", ret);
+	return ret;
+
+} /* end afs_file_readpage() */
+
+/*****************************************************************************/
+/*
+ * get a page cookie for the specified page
+ */
+#ifdef AFS_CACHING_SUPPORT
+int afs_cache_get_page_cookie(struct page *page,
+			      struct cachefs_page **_page_cookie)
+{
+	int ret;
+
+	_enter("");
+	ret = cachefs_page_get_private(page,_page_cookie, GFP_NOIO);
+
+	_leave(" = %d", ret);
+	return ret;
+} /* end afs_cache_get_page_cookie() */
+#endif
+
+/*****************************************************************************/
+/*
+ * invalidate part or all of a page
+ */
+static int afs_file_invalidatepage(struct page *page, unsigned long offset)
+{
+	int ret = 1;
+
+	_enter("{%lu},%lu", page->index, offset);
+
+	BUG_ON(!PageLocked(page));
+
+	if (PagePrivate(page)) {
+#ifdef AFS_CACHING_SUPPORT
+		struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
+		cachefs_uncache_page(vnode->cache,page);
+#endif
+
+		/* We release buffers only if the entire page is being
+		 * invalidated.
+		 * The get_block cached value has been unconditionally
+		 * invalidated, so real IO is not possible anymore.
+		 */
+		if (offset == 0) {
+			BUG_ON(!PageLocked(page));
+
+			ret = 0;
+			if (!PageWriteback(page))
+				ret = page->mapping->a_ops->releasepage(page,
+									0);
+		}
+	}
+
+	_leave(" = %d", ret);
+	return ret;
+} /* end afs_file_invalidatepage() */
+
+/*****************************************************************************/
+/*
+ * release a page and cleanup its private data
+ */
+static int afs_file_releasepage(struct page *page, int gfp_flags)
+{
+	struct cachefs_page *pageio;
+
+	_enter("{%lu},%x", page->index, gfp_flags);
+
+	if (PagePrivate(page)) {
+#ifdef AFS_CACHING_SUPPORT
+		struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
+		cachefs_uncache_page(vnode->cache, page);
+#endif
+
+		pageio = (struct cachefs_page *) page->private;
+		page->private = 0;
+		ClearPagePrivate(page);
+
+		if (pageio)
+			kfree(pageio);
+	}
+
+	_leave(" = 0");
+	return 0;
+} /* end afs_file_releasepage() */