[linux-2.6-block.git] / fs / afs / file.c

/* AFS filesystem file handling
 *
 * Copyright (C) 2002, 2007 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/fs.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/gfp.h>
#include "internal.h"

static int afs_readpage(struct file *file, struct page *page);
static void afs_invalidatepage(struct page *page, unsigned int offset,
			       unsigned int length);
static int afs_releasepage(struct page *page, gfp_t gfp_flags);
static int afs_launder_page(struct page *page);

static int afs_readpages(struct file *filp, struct address_space *mapping,
			 struct list_head *pages, unsigned nr_pages);

const struct file_operations afs_file_operations = {
	.open		= afs_open,
	.release	= afs_release,
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= afs_file_write,
	.mmap		= generic_file_readonly_mmap,
	.splice_read	= generic_file_splice_read,
	.fsync		= afs_fsync,
	.lock		= afs_lock,
	.flock		= afs_flock,
};

const struct inode_operations afs_file_inode_operations = {
	.getattr	= afs_getattr,
	.setattr	= afs_setattr,
	.permission	= afs_permission,
};

const struct address_space_operations afs_fs_aops = {
	.readpage	= afs_readpage,
	.readpages	= afs_readpages,
	.set_page_dirty	= afs_set_page_dirty,
	.launder_page	= afs_launder_page,
	.releasepage	= afs_releasepage,
	.invalidatepage	= afs_invalidatepage,
	.write_begin	= afs_write_begin,
	.write_end	= afs_write_end,
	.writepage	= afs_writepage,
	.writepages	= afs_writepages,
};

/*
 * open an AFS file or directory and attach a key to it
 */
int afs_open(struct inode *inode, struct file *file)
{
	struct afs_vnode *vnode = AFS_FS_I(inode);
	struct key *key;
	int ret;

	_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);

	key = afs_request_key(vnode->volume->cell);
	if (IS_ERR(key)) {
		_leave(" = %ld [key]", PTR_ERR(key));
		return PTR_ERR(key);
	}

	ret = afs_validate(vnode, key);
	if (ret < 0) {
		_leave(" = %d [val]", ret);
		return ret;
	}

	file->private_data = key;
	_leave(" = 0");
	return 0;
}

/*
 * release an AFS file or directory and discard its key
 */
int afs_release(struct inode *inode, struct file *file)
{
	struct afs_vnode *vnode = AFS_FS_I(inode);

	_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);

	key_put(file->private_data);
	_leave(" = 0");
	return 0;
}

#ifdef CONFIG_AFS_FSCACHE
/*
 * deal with notification that a page was read from the cache
 */
static void afs_file_readpage_read_complete(struct page *page,
					    void *data,
					    int error)
{
	_enter("%p,%p,%d", page, data, error);

	/* if the read completes with an error, we just unlock the page and let
	 * the VM reissue the readpage */
	if (!error)
		SetPageUptodate(page);
	unlock_page(page);
}
#endif

/*
 * read page from file, directory or symlink, given a key to use
 */
int afs_page_filler(void *data, struct page *page)
{
	struct inode *inode = page->mapping->host;
	struct afs_vnode *vnode = AFS_FS_I(inode);
	struct key *key = data;
	size_t len;
	off_t offset;
	int ret;

	_enter("{%x},{%lu},{%lu}", key_serial(key), inode->i_ino, page->index);

	BUG_ON(!PageLocked(page));

	ret = -ESTALE;
	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
		goto error;

	/* is it cached? */
#ifdef CONFIG_AFS_FSCACHE
	ret = fscache_read_or_alloc_page(vnode->cache,
					 page,
					 afs_file_readpage_read_complete,
					 NULL,
					 GFP_KERNEL);
#else
	ret = -ENOBUFS;
#endif
	switch (ret) {
		/* read BIO submitted (page in cache) */
	case 0:
		break;

		/* page not yet cached */
	case -ENODATA:
		_debug("cache said ENODATA");
		goto go_on;

		/* page will not be cached */
	case -ENOBUFS:
		_debug("cache said ENOBUFS");
	default:
	go_on:
		offset = page->index << PAGE_CACHE_SHIFT;
		len = min_t(size_t, i_size_read(inode) - offset, PAGE_SIZE);

		/* read the contents of the file from the server into the
		 * page */
		ret = afs_vnode_fetch_data(vnode, key, offset, len, page);
		if (ret < 0) {
			if (ret == -ENOENT) {
				_debug("got NOENT from server"
				       " - marking file deleted and stale");
				set_bit(AFS_VNODE_DELETED, &vnode->flags);
				ret = -ESTALE;
			}

#ifdef CONFIG_AFS_FSCACHE
			fscache_uncache_page(vnode->cache, page);
#endif
			BUG_ON(PageFsCache(page));
			goto error;
		}

		SetPageUptodate(page);

		/* send the page to the cache */
#ifdef CONFIG_AFS_FSCACHE
		if (PageFsCache(page) &&
		    fscache_write_page(vnode->cache, page, GFP_KERNEL) != 0) {
			fscache_uncache_page(vnode->cache, page);
			BUG_ON(PageFsCache(page));
		}
#endif
		unlock_page(page);
	}

	_leave(" = 0");
	return 0;

error:
	SetPageError(page);
	unlock_page(page);
	_leave(" = %d", ret);
	return ret;
}

/*
 * read page from file, directory or symlink, given a file to nominate the key
 * to be used
 */
static int afs_readpage(struct file *file, struct page *page)
{
	struct key *key;
	int ret;

	if (file) {
		key = file->private_data;
		ASSERT(key != NULL);
		ret = afs_page_filler(key, page);
	} else {
		struct inode *inode = page->mapping->host;
		key = afs_request_key(AFS_FS_S(inode->i_sb)->volume->cell);
		if (IS_ERR(key)) {
			ret = PTR_ERR(key);
		} else {
			ret = afs_page_filler(key, page);
			key_put(key);
		}
	}
	return ret;
}

/*
 * read a set of pages
 */
static int afs_readpages(struct file *file, struct address_space *mapping,
			 struct list_head *pages, unsigned nr_pages)
{
	struct key *key = file->private_data;
	struct afs_vnode *vnode;
	int ret = 0;

	_enter("{%d},{%lu},,%d",
	       key_serial(key), mapping->host->i_ino, nr_pages);

	ASSERT(key != NULL);

	vnode = AFS_FS_I(mapping->host);
	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
		_leave(" = -ESTALE");
		return -ESTALE;
	}

	/* attempt to read as many of the pages as possible */
#ifdef CONFIG_AFS_FSCACHE
	ret = fscache_read_or_alloc_pages(vnode->cache,
					  mapping,
					  pages,
					  &nr_pages,
					  afs_file_readpage_read_complete,
					  NULL,
					  mapping_gfp_mask(mapping));
#else
	ret = -ENOBUFS;
#endif

	switch (ret) {
		/* all pages are being read from the cache */
	case 0:
		BUG_ON(!list_empty(pages));
		BUG_ON(nr_pages != 0);
		_leave(" = 0 [reading all]");
		return 0;

		/* there were pages that couldn't be read from the cache */
	case -ENODATA:
	case -ENOBUFS:
		break;

		/* other error */
	default:
		_leave(" = %d", ret);
		return ret;
	}

	/* load the missing pages from the network */
	ret = read_cache_pages(mapping, pages, afs_page_filler, key);

	_leave(" = %d [netting]", ret);
	return ret;
}

/*
 * write back a dirty page
 */
static int afs_launder_page(struct page *page)
{
	_enter("{%lu}", page->index);

	return 0;
}

/*
 * invalidate part or all of a page
 * - release a page and clean up its private data if offset is 0 (indicating
 *   the entire page)
 */
static void afs_invalidatepage(struct page *page, unsigned int offset,
			       unsigned int length)
{
	struct afs_writeback *wb = (struct afs_writeback *) page_private(page);

	_enter("{%lu},%u,%u", page->index, offset, length);

	BUG_ON(!PageLocked(page));

	/* we clean up only if the entire page is being invalidated */
	if (offset == 0 && length == PAGE_CACHE_SIZE) {
#ifdef CONFIG_AFS_FSCACHE
		if (PageFsCache(page)) {
			struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
			fscache_wait_on_page_write(vnode->cache, page);
			fscache_uncache_page(vnode->cache, page);
		}
#endif

		if (PagePrivate(page)) {
			if (wb && !PageWriteback(page)) {
				set_page_private(page, 0);
				afs_put_writeback(wb);
			}

			if (!page_private(page))
				ClearPagePrivate(page);
		}
	}

	_leave("");
}

/*
 * release a page and clean up its private state if it's not busy
 * - return true if the page can now be released, false if not
 */
static int afs_releasepage(struct page *page, gfp_t gfp_flags)
{
	struct afs_writeback *wb = (struct afs_writeback *) page_private(page);
	struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);

	_enter("{{%x:%u}[%lu],%lx},%x",
	       vnode->fid.vid, vnode->fid.vnode, page->index, page->flags,
	       gfp_flags);

	/* deny if page is being written to the cache and the caller hasn't
	 * elected to wait */
#ifdef CONFIG_AFS_FSCACHE
	if (!fscache_maybe_release_page(vnode->cache, page, gfp_flags)) {
		_leave(" = F [cache busy]");
		return 0;
	}
#endif

	if (PagePrivate(page)) {
		if (wb) {
			set_page_private(page, 0);
			afs_put_writeback(wb);
		}
		ClearPagePrivate(page);
	}

	/* indicate that the page can be released */
	_leave(" = T");
	return 1;
}
Commit	Line	Data
08e0e7c8	1	/* AFS filesystem file handling
1da177e4	2	*
08e0e7c8	3	* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
1da177e4 LT	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/init.h>
1da177e4 LT	15	#include <linux/fs.h>
1da177e4 LT	16	#include <linux/pagemap.h>
31143d5d	17	#include <linux/writeback.h>
5a0e3ad6	18	#include <linux/gfp.h>
1da177e4 LT	19	#include "internal.h"
1da177e4 LT	20
416351f2	21	static int afs_readpage(struct file file, struct page page);
d47992f8 LC	22	static void afs_invalidatepage(struct page *page, unsigned int offset,
d47992f8 LC	23	unsigned int length);
416351f2	24	static int afs_releasepage(struct page *page, gfp_t gfp_flags);
31143d5d	25	static int afs_launder_page(struct page *page);
1da177e4	26
9b3f26c9 DH	27	static int afs_readpages(struct file filp, struct address_space mapping,
	28	struct list_head *pages, unsigned nr_pages);
	29
00d3b7a4 DH	30	const struct file_operations afs_file_operations = {
	31	.open = afs_open,
	32	.release = afs_release,
	33	.llseek = generic_file_llseek,
aad4f8bb	34	.read_iter = generic_file_read_iter,
50b5551d	35	.write_iter = afs_file_write,
00d3b7a4	36	.mmap = generic_file_readonly_mmap,
5ffc4ef4	37	.splice_read = generic_file_splice_read,
31143d5d	38	.fsync = afs_fsync,
e8d6c554 DH	39	.lock = afs_lock,
e8d6c554 DH	40	.flock = afs_flock,
00d3b7a4 DH	41	};
00d3b7a4 DH	42
754661f1	43	const struct inode_operations afs_file_inode_operations = {
416351f2	44	.getattr = afs_getattr,
31143d5d	45	.setattr = afs_setattr,
00d3b7a4	46	.permission = afs_permission,
1da177e4 LT	47	};
1da177e4 LT	48
f5e54d6e	49	const struct address_space_operations afs_fs_aops = {
416351f2	50	.readpage = afs_readpage,
9b3f26c9	51	.readpages = afs_readpages,
31143d5d DH	52	.set_page_dirty = afs_set_page_dirty,
31143d5d DH	53	.launder_page = afs_launder_page,
416351f2 DH	54	.releasepage = afs_releasepage,
416351f2 DH	55	.invalidatepage = afs_invalidatepage,
15b4650e NP	56	.write_begin = afs_write_begin,
15b4650e NP	57	.write_end = afs_write_end,
31143d5d DH	58	.writepage = afs_writepage,
31143d5d DH	59	.writepages = afs_writepages,
1da177e4 LT	60	};
1da177e4 LT	61
00d3b7a4 DH	62	/*
	63	* open an AFS file or directory and attach a key to it
	64	*/
	65	int afs_open(struct inode inode, struct file file)
	66	{
	67	struct afs_vnode *vnode = AFS_FS_I(inode);
	68	struct key *key;
260a9803	69	int ret;
00d3b7a4	70
416351f2	71	_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);
00d3b7a4 DH	72
	73	key = afs_request_key(vnode->volume->cell);
	74	if (IS_ERR(key)) {
	75	_leave(" = %ld [key]", PTR_ERR(key));
	76	return PTR_ERR(key);
	77	}
	78
260a9803 DH	79	ret = afs_validate(vnode, key);
	80	if (ret < 0) {
	81	_leave(" = %d [val]", ret);
	82	return ret;
	83	}
	84
00d3b7a4 DH	85	file->private_data = key;
	86	_leave(" = 0");
	87	return 0;
	88	}
	89
	90	/*
	91	* release an AFS file or directory and discard its key
	92	*/
	93	int afs_release(struct inode inode, struct file file)
	94	{
	95	struct afs_vnode *vnode = AFS_FS_I(inode);
	96
416351f2	97	_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);
00d3b7a4 DH	98
	99	key_put(file->private_data);
	100	_leave(" = 0");
	101	return 0;
	102	}
	103
6566abdb	104	#ifdef CONFIG_AFS_FSCACHE
1da177e4 LT	105	/*
	106	* deal with notification that a page was read from the cache
	107	*/
9b3f26c9 DH	108	static void afs_file_readpage_read_complete(struct page *page,
	109	void *data,
	110	int error)
1da177e4	111	{
9b3f26c9	112	_enter("%p,%p,%d", page, data, error);
1da177e4	113
9b3f26c9 DH	114	/* if the read completes with an error, we just unlock the page and let
	115	* the VM reissue the readpage */
	116	if (!error)
1da177e4 LT	117	SetPageUptodate(page);
1da177e4 LT	118	unlock_page(page);
ec26815a	119	}
6566abdb	120	#endif
1da177e4	121
1da177e4	122	/*
f6d335c0	123	* read page from file, directory or symlink, given a key to use
1da177e4	124	*/
f6d335c0	125	int afs_page_filler(void data, struct page page)
1da177e4	126	{
f6d335c0 AV	127	struct inode *inode = page->mapping->host;
	128	struct afs_vnode *vnode = AFS_FS_I(inode);
	129	struct key *key = data;
08e0e7c8 DH	130	size_t len;
08e0e7c8 DH	131	off_t offset;
1da177e4 LT	132	int ret;
1da177e4 LT	133
00d3b7a4	134	_enter("{%x},{%lu},{%lu}", key_serial(key), inode->i_ino, page->index);
1da177e4	135
cd7619d6	136	BUG_ON(!PageLocked(page));
1da177e4 LT	137
1da177e4 LT	138	ret = -ESTALE;
08e0e7c8	139	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1da177e4 LT	140	goto error;
1da177e4 LT	141
1da177e4	142	/* is it cached? */
9b3f26c9 DH	143	#ifdef CONFIG_AFS_FSCACHE
9b3f26c9 DH	144	ret = fscache_read_or_alloc_page(vnode->cache,
1da177e4 LT	145	page,
	146	afs_file_readpage_read_complete,
	147	NULL,
	148	GFP_KERNEL);
	149	#else
	150	ret = -ENOBUFS;
	151	#endif
1da177e4	152	switch (ret) {
1da177e4 LT	153	/* read BIO submitted (page in cache) */
	154	case 0:
	155	break;
	156
9b3f26c9	157	/* page not yet cached */
1da177e4	158	case -ENODATA:
9b3f26c9 DH	159	_debug("cache said ENODATA");
	160	goto go_on;
	161
	162	/* page will not be cached */
	163	case -ENOBUFS:
	164	_debug("cache said ENOBUFS");
1da177e4	165	default:
9b3f26c9	166	go_on:
08e0e7c8 DH	167	offset = page->index << PAGE_CACHE_SHIFT;
08e0e7c8 DH	168	len = min_t(size_t, i_size_read(inode) - offset, PAGE_SIZE);
1da177e4 LT	169
	170	/* read the contents of the file from the server into the
	171	* page */
00d3b7a4	172	ret = afs_vnode_fetch_data(vnode, key, offset, len, page);
1da177e4	173	if (ret < 0) {
08e0e7c8	174	if (ret == -ENOENT) {
1da177e4 LT	175	_debug("got NOENT from server"
1da177e4 LT	176	" - marking file deleted and stale");
08e0e7c8	177	set_bit(AFS_VNODE_DELETED, &vnode->flags);
1da177e4 LT	178	ret = -ESTALE;
1da177e4 LT	179	}
9b3f26c9 DH	180
	181	#ifdef CONFIG_AFS_FSCACHE
	182	fscache_uncache_page(vnode->cache, page);
1da177e4	183	#endif
9b3f26c9	184	BUG_ON(PageFsCache(page));
1da177e4 LT	185	goto error;
	186	}
	187
	188	SetPageUptodate(page);
	189
9b3f26c9 DH	190	/* send the page to the cache */
	191	#ifdef CONFIG_AFS_FSCACHE
	192	if (PageFsCache(page) &&
	193	fscache_write_page(vnode->cache, page, GFP_KERNEL) != 0) {
	194	fscache_uncache_page(vnode->cache, page);
	195	BUG_ON(PageFsCache(page));
1da177e4	196	}
1da177e4	197	#endif
9b3f26c9	198	unlock_page(page);
1da177e4 LT	199	}
	200
	201	_leave(" = 0");
	202	return 0;
	203
08e0e7c8	204	error:
1da177e4 LT	205	SetPageError(page);
1da177e4 LT	206	unlock_page(page);
1da177e4 LT	207	_leave(" = %d", ret);
1da177e4 LT	208	return ret;
ec26815a	209	}
1da177e4	210
f6d335c0 AV	211	/*
	212	* read page from file, directory or symlink, given a file to nominate the key
	213	* to be used
	214	*/
	215	static int afs_readpage(struct file file, struct page page)
	216	{
	217	struct key *key;
	218	int ret;
	219
	220	if (file) {
	221	key = file->private_data;
	222	ASSERT(key != NULL);
	223	ret = afs_page_filler(key, page);
	224	} else {
	225	struct inode *inode = page->mapping->host;
	226	key = afs_request_key(AFS_FS_S(inode->i_sb)->volume->cell);
	227	if (IS_ERR(key)) {
	228	ret = PTR_ERR(key);
	229	} else {
	230	ret = afs_page_filler(key, page);
	231	key_put(key);
	232	}
	233	}
	234	return ret;
	235	}
	236
1da177e4	237	/*
9b3f26c9	238	* read a set of pages
1da177e4	239	*/
9b3f26c9 DH	240	static int afs_readpages(struct file file, struct address_space mapping,
9b3f26c9 DH	241	struct list_head *pages, unsigned nr_pages)
1da177e4	242	{
f6d335c0	243	struct key *key = file->private_data;
9b3f26c9 DH	244	struct afs_vnode *vnode;
9b3f26c9 DH	245	int ret = 0;
1da177e4	246
f6d335c0 AV	247	_enter("{%d},{%lu},,%d",
	248	key_serial(key), mapping->host->i_ino, nr_pages);
	249
	250	ASSERT(key != NULL);
1da177e4	251
9b3f26c9	252	vnode = AFS_FS_I(mapping->host);
ad2a8e60	253	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
9b3f26c9 DH	254	_leave(" = -ESTALE");
	255	return -ESTALE;
	256	}
1da177e4	257
9b3f26c9 DH	258	/* attempt to read as many of the pages as possible */
	259	#ifdef CONFIG_AFS_FSCACHE
	260	ret = fscache_read_or_alloc_pages(vnode->cache,
	261	mapping,
	262	pages,
	263	&nr_pages,
	264	afs_file_readpage_read_complete,
	265	NULL,
	266	mapping_gfp_mask(mapping));
	267	#else
	268	ret = -ENOBUFS;
	269	#endif
	270
	271	switch (ret) {
	272	/* all pages are being read from the cache */
	273	case 0:
	274	BUG_ON(!list_empty(pages));
	275	BUG_ON(nr_pages != 0);
	276	_leave(" = 0 [reading all]");
	277	return 0;
	278
	279	/* there were pages that couldn't be read from the cache */
	280	case -ENODATA:
	281	case -ENOBUFS:
	282	break;
	283
	284	/* other error */
	285	default:
	286	_leave(" = %d", ret);
	287	return ret;
1da177e4 LT	288	}
1da177e4 LT	289
9b3f26c9	290	/* load the missing pages from the network */
f6d335c0	291	ret = read_cache_pages(mapping, pages, afs_page_filler, key);
9b3f26c9 DH	292
	293	_leave(" = %d [netting]", ret);
	294	return ret;
ec26815a	295	}
1da177e4	296
31143d5d DH	297	/*
	298	* write back a dirty page
	299	*/
	300	static int afs_launder_page(struct page *page)
	301	{
	302	_enter("{%lu}", page->index);
	303
	304	return 0;
	305	}
	306
1da177e4	307	/*
9b3f26c9 DH	308	* invalidate part or all of a page
	309	* - release a page and clean up its private data if offset is 0 (indicating
	310	* the entire page)
	311	*/
d47992f8 LC	312	static void afs_invalidatepage(struct page *page, unsigned int offset,
d47992f8 LC	313	unsigned int length)
9b3f26c9 DH	314	{
	315	struct afs_writeback wb = (struct afs_writeback ) page_private(page);
	316
d47992f8	317	_enter("{%lu},%u,%u", page->index, offset, length);
9b3f26c9 DH	318
	319	BUG_ON(!PageLocked(page));
	320
	321	/* we clean up only if the entire page is being invalidated */
d47992f8	322	if (offset == 0 && length == PAGE_CACHE_SIZE) {
9b3f26c9 DH	323	#ifdef CONFIG_AFS_FSCACHE
	324	if (PageFsCache(page)) {
	325	struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
	326	fscache_wait_on_page_write(vnode->cache, page);
	327	fscache_uncache_page(vnode->cache, page);
9b3f26c9 DH	328	}
	329	#endif
	330
	331	if (PagePrivate(page)) {
	332	if (wb && !PageWriteback(page)) {
	333	set_page_private(page, 0);
	334	afs_put_writeback(wb);
	335	}
	336
	337	if (!page_private(page))
	338	ClearPagePrivate(page);
	339	}
	340	}
	341
	342	_leave("");
	343	}
	344
	345	/*
	346	* release a page and clean up its private state if it's not busy
	347	* - return true if the page can now be released, false if not
1da177e4	348	*/
416351f2	349	static int afs_releasepage(struct page *page, gfp_t gfp_flags)
1da177e4	350	{
9b3f26c9	351	struct afs_writeback wb = (struct afs_writeback ) page_private(page);
416351f2	352	struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
1da177e4	353
416351f2 DH	354	_enter("{{%x:%u}[%lu],%lx},%x",
	355	vnode->fid.vid, vnode->fid.vnode, page->index, page->flags,
	356	gfp_flags);
1da177e4	357
9b3f26c9 DH	358	/* deny if page is being written to the cache and the caller hasn't
	359	* elected to wait */
	360	#ifdef CONFIG_AFS_FSCACHE
201a1542 DH	361	if (!fscache_maybe_release_page(vnode->cache, page, gfp_flags)) {
	362	_leave(" = F [cache busy]");
	363	return 0;
9b3f26c9 DH	364	}
	365	#endif
	366
1da177e4	367	if (PagePrivate(page)) {
9b3f26c9 DH	368	if (wb) {
	369	set_page_private(page, 0);
	370	afs_put_writeback(wb);
	371	}
1da177e4	372	ClearPagePrivate(page);
1da177e4 LT	373	}
1da177e4 LT	374
9b3f26c9 DH	375	/* indicate that the page can be released */
	376	_leave(" = T");
	377	return 1;
ec26815a	378	}