Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1597 deletions

diff --git a/ANDROID_3.4.5/fs/ubifs/file.c b/ANDROID_3.4.5/fs/ubifs/file.c
deleted file mode 100644
index 9acb0fa3..00000000
--- a/ANDROID_3.4.5/fs/ubifs/file.c
+++ /dev/null
@@ -1,1597 +0,0 @@
-/*
- * This file is part of UBIFS.
- *
- * Copyright (C) 2006-2008 Nokia Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Authors: Artem Bityutskiy (Битюцкий Артём)
- *          Adrian Hunter
- */
-
-/*
- * This file implements VFS file and inode operations for regular files, device
- * nodes and symlinks as well as address space operations.
- *
- * UBIFS uses 2 page flags: @PG_private and @PG_checked. @PG_private is set if
- * the page is dirty and is used for optimization purposes - dirty pages are
- * not budgeted so the flag shows that 'ubifs_write_end()' should not release
- * the budget for this page. The @PG_checked flag is set if full budgeting is
- * required for the page e.g., when it corresponds to a file hole or it is
- * beyond the file size. The budgeting is done in 'ubifs_write_begin()', because
- * it is OK to fail in this function, and the budget is released in
- * 'ubifs_write_end()'. So the @PG_private and @PG_checked flags carry
- * information about how the page was budgeted, to make it possible to release
- * the budget properly.
- *
- * A thing to keep in mind: inode @i_mutex is locked in most VFS operations we
- * implement. However, this is not true for 'ubifs_writepage()', which may be
- * called with @i_mutex unlocked. For example, when pdflush is doing background
- * write-back, it calls 'ubifs_writepage()' with unlocked @i_mutex. At "normal"
- * work-paths the @i_mutex is locked in 'ubifs_writepage()', e.g. in the
- * "sys_write -> alloc_pages -> direct reclaim path". So, in 'ubifs_writepage()'
- * we are only guaranteed that the page is locked.
- *
- * Similarly, @i_mutex is not always locked in 'ubifs_readpage()', e.g., the
- * read-ahead path does not lock it ("sys_read -> generic_file_aio_read ->
- * ondemand_readahead -> readpage"). In case of readahead, @I_SYNC flag is not
- * set as well. However, UBIFS disables readahead.
- */
-
-#include "ubifs.h"
-#include <linux/mount.h>
-#include <linux/namei.h>
-#include <linux/slab.h>
-
-static int read_block(struct inode *inode, void *addr, unsigned int block,
-		      struct ubifs_data_node *dn)
-{
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	int err, len, out_len;
-	union ubifs_key key;
-	unsigned int dlen;
-
-	data_key_init(c, &key, inode->i_ino, block);
-	err = ubifs_tnc_lookup(c, &key, dn);
-	if (err) {
-		if (err == -ENOENT)
-			/* Not found, so it must be a hole */
-			memset(addr, 0, UBIFS_BLOCK_SIZE);
-		return err;
-	}
-
-	ubifs_assert(le64_to_cpu(dn->ch.sqnum) >
-		     ubifs_inode(inode)->creat_sqnum);
-	len = le32_to_cpu(dn->size);
-	if (len <= 0 || len > UBIFS_BLOCK_SIZE)
-		goto dump;
-
-	dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
-	out_len = UBIFS_BLOCK_SIZE;
-	err = ubifs_decompress(&dn->data, dlen, addr, &out_len,
-			       le16_to_cpu(dn->compr_type));
-	if (err || len != out_len)
-		goto dump;
-
-	/*
-	 * Data length can be less than a full block, even for blocks that are
-	 * not the last in the file (e.g., as a result of making a hole and
-	 * appending data). Ensure that the remainder is zeroed out.
-	 */
-	if (len < UBIFS_BLOCK_SIZE)
-		memset(addr + len, 0, UBIFS_BLOCK_SIZE - len);
-
-	return 0;
-
-dump:
-	ubifs_err("bad data node (block %u, inode %lu)",
-		  block, inode->i_ino);
-	dbg_dump_node(c, dn);
-	return -EINVAL;
-}
-
-static int do_readpage(struct page *page)
-{
-	void *addr;
-	int err = 0, i;
-	unsigned int block, beyond;
-	struct ubifs_data_node *dn;
-	struct inode *inode = page->mapping->host;
-	loff_t i_size = i_size_read(inode);
-
-	dbg_gen("ino %lu, pg %lu, i_size %lld, flags %#lx",
-		inode->i_ino, page->index, i_size, page->flags);
-	ubifs_assert(!PageChecked(page));
-	ubifs_assert(!PagePrivate(page));
-
-	addr = kmap(page);
-
-	block = page->index << UBIFS_BLOCKS_PER_PAGE_SHIFT;
-	beyond = (i_size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
-	if (block >= beyond) {
-		/* Reading beyond inode */
-		SetPageChecked(page);
-		memset(addr, 0, PAGE_CACHE_SIZE);
-		goto out;
-	}
-
-	dn = kmalloc(UBIFS_MAX_DATA_NODE_SZ, GFP_NOFS);
-	if (!dn) {
-		err = -ENOMEM;
-		goto error;
-	}
-
-	i = 0;
-	while (1) {
-		int ret;
-
-		if (block >= beyond) {
-			/* Reading beyond inode */
-			err = -ENOENT;
-			memset(addr, 0, UBIFS_BLOCK_SIZE);
-		} else {
-			ret = read_block(inode, addr, block, dn);
-			if (ret) {
-				err = ret;
-				if (err != -ENOENT)
-					break;
-			} else if (block + 1 == beyond) {
-				int dlen = le32_to_cpu(dn->size);
-				int ilen = i_size & (UBIFS_BLOCK_SIZE - 1);
-
-				if (ilen && ilen < dlen)
-					memset(addr + ilen, 0, dlen - ilen);
-			}
-		}
-		if (++i >= UBIFS_BLOCKS_PER_PAGE)
-			break;
-		block += 1;
-		addr += UBIFS_BLOCK_SIZE;
-	}
-	if (err) {
-		if (err == -ENOENT) {
-			/* Not found, so it must be a hole */
-			SetPageChecked(page);
-			dbg_gen("hole");
-			goto out_free;
-		}
-		ubifs_err("cannot read page %lu of inode %lu, error %d",
-			  page->index, inode->i_ino, err);
-		goto error;
-	}
-
-out_free:
-	kfree(dn);
-out:
-	SetPageUptodate(page);
-	ClearPageError(page);
-	flush_dcache_page(page);
-	kunmap(page);
-	return 0;
-
-error:
-	kfree(dn);
-	ClearPageUptodate(page);
-	SetPageError(page);
-	flush_dcache_page(page);
-	kunmap(page);
-	return err;
-}
-
-/**
- * release_new_page_budget - release budget of a new page.
- * @c: UBIFS file-system description object
- *
- * This is a helper function which releases budget corresponding to the budget
- * of one new page of data.
- */
-static void release_new_page_budget(struct ubifs_info *c)
-{
-	struct ubifs_budget_req req = { .recalculate = 1, .new_page = 1 };
-
-	ubifs_release_budget(c, &req);
-}
-
-/**
- * release_existing_page_budget - release budget of an existing page.
- * @c: UBIFS file-system description object
- *
- * This is a helper function which releases budget corresponding to the budget
- * of changing one one page of data which already exists on the flash media.
- */
-static void release_existing_page_budget(struct ubifs_info *c)
-{
-	struct ubifs_budget_req req = { .dd_growth = c->bi.page_budget};
-
-	ubifs_release_budget(c, &req);
-}
-
-static int write_begin_slow(struct address_space *mapping,
-			    loff_t pos, unsigned len, struct page **pagep,
-			    unsigned flags)
-{
-	struct inode *inode = mapping->host;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-	struct ubifs_budget_req req = { .new_page = 1 };
-	int uninitialized_var(err), appending = !!(pos + len > inode->i_size);
-	struct page *page;
-
-	dbg_gen("ino %lu, pos %llu, len %u, i_size %lld",
-		inode->i_ino, pos, len, inode->i_size);
-
-	/*
-	 * At the slow path we have to budget before locking the page, because
-	 * budgeting may force write-back, which would wait on locked pages and
-	 * deadlock if we had the page locked. At this point we do not know
-	 * anything about the page, so assume that this is a new page which is
-	 * written to a hole. This corresponds to largest budget. Later the
-	 * budget will be amended if this is not true.
-	 */
-	if (appending)
-		/* We are appending data, budget for inode change */
-		req.dirtied_ino = 1;
-
-	err = ubifs_budget_space(c, &req);
-	if (unlikely(err))
-		return err;
-
-	page = grab_cache_page_write_begin(mapping, index, flags);
-	if (unlikely(!page)) {
-		ubifs_release_budget(c, &req);
-		return -ENOMEM;
-	}
-
-	if (!PageUptodate(page)) {
-		if (!(pos & ~PAGE_CACHE_MASK) && len == PAGE_CACHE_SIZE)
-			SetPageChecked(page);
-		else {
-			err = do_readpage(page);
-			if (err) {
-				unlock_page(page);
-				page_cache_release(page);
-				return err;
-			}
-		}
-
-		SetPageUptodate(page);
-		ClearPageError(page);
-	}
-
-	if (PagePrivate(page))
-		/*
-		 * The page is dirty, which means it was budgeted twice:
-		 *   o first time the budget was allocated by the task which
-		 *     made the page dirty and set the PG_private flag;
-		 *   o and then we budgeted for it for the second time at the
-		 *     very beginning of this function.
-		 *
-		 * So what we have to do is to release the page budget we
-		 * allocated.
-		 */
-		release_new_page_budget(c);
-	else if (!PageChecked(page))
-		/*
-		 * We are changing a page which already exists on the media.
-		 * This means that changing the page does not make the amount
-		 * of indexing information larger, and this part of the budget
-		 * which we have already acquired may be released.
-		 */
-		ubifs_convert_page_budget(c);
-
-	if (appending) {
-		struct ubifs_inode *ui = ubifs_inode(inode);
-
-		/*
-		 * 'ubifs_write_end()' is optimized from the fast-path part of
-		 * 'ubifs_write_begin()' and expects the @ui_mutex to be locked
-		 * if data is appended.
-		 */
-		mutex_lock(&ui->ui_mutex);
-		if (ui->dirty)
-			/*
-			 * The inode is dirty already, so we may free the
-			 * budget we allocated.
-			 */
-			ubifs_release_dirty_inode_budget(c, ui);
-	}
-
-	*pagep = page;
-	return 0;
-}
-
-/**
- * allocate_budget - allocate budget for 'ubifs_write_begin()'.
- * @c: UBIFS file-system description object
- * @page: page to allocate budget for
- * @ui: UBIFS inode object the page belongs to
- * @appending: non-zero if the page is appended
- *
- * This is a helper function for 'ubifs_write_begin()' which allocates budget
- * for the operation. The budget is allocated differently depending on whether
- * this is appending, whether the page is dirty or not, and so on. This
- * function leaves the @ui->ui_mutex locked in case of appending. Returns zero
- * in case of success and %-ENOSPC in case of failure.
- */
-static int allocate_budget(struct ubifs_info *c, struct page *page,
-			   struct ubifs_inode *ui, int appending)
-{
-	struct ubifs_budget_req req = { .fast = 1 };
-
-	if (PagePrivate(page)) {
-		if (!appending)
-			/*
-			 * The page is dirty and we are not appending, which
-			 * means no budget is needed at all.
-			 */
-			return 0;
-
-		mutex_lock(&ui->ui_mutex);
-		if (ui->dirty)
-			/*
-			 * The page is dirty and we are appending, so the inode
-			 * has to be marked as dirty. However, it is already
-			 * dirty, so we do not need any budget. We may return,
-			 * but @ui->ui_mutex hast to be left locked because we
-			 * should prevent write-back from flushing the inode
-			 * and freeing the budget. The lock will be released in
-			 * 'ubifs_write_end()'.
-			 */
-			return 0;
-
-		/*
-		 * The page is dirty, we are appending, the inode is clean, so
-		 * we need to budget the inode change.
-		 */
-		req.dirtied_ino = 1;
-	} else {
-		if (PageChecked(page))
-			/*
-			 * The page corresponds to a hole and does not
-			 * exist on the media. So changing it makes
-			 * make the amount of indexing information
-			 * larger, and we have to budget for a new
-			 * page.
-			 */
-			req.new_page = 1;
-		else
-			/*
-			 * Not a hole, the change will not add any new
-			 * indexing information, budget for page
-			 * change.
-			 */
-			req.dirtied_page = 1;
-
-		if (appending) {
-			mutex_lock(&ui->ui_mutex);
-			if (!ui->dirty)
-				/*
-				 * The inode is clean but we will have to mark
-				 * it as dirty because we are appending. This
-				 * needs a budget.
-				 */
-				req.dirtied_ino = 1;
-		}
-	}
-
-	return ubifs_budget_space(c, &req);
-}
-
-/*
- * This function is called when a page of data is going to be written. Since
- * the page of data will not necessarily go to the flash straight away, UBIFS
- * has to reserve space on the media for it, which is done by means of
- * budgeting.
- *
- * This is the hot-path of the file-system and we are trying to optimize it as
- * much as possible. For this reasons it is split on 2 parts - slow and fast.
- *
- * There many budgeting cases:
- *     o a new page is appended - we have to budget for a new page and for
- *       changing the inode; however, if the inode is already dirty, there is
- *       no need to budget for it;
- *     o an existing clean page is changed - we have budget for it; if the page
- *       does not exist on the media (a hole), we have to budget for a new
- *       page; otherwise, we may budget for changing an existing page; the
- *       difference between these cases is that changing an existing page does
- *       not introduce anything new to the FS indexing information, so it does
- *       not grow, and smaller budget is acquired in this case;
- *     o an existing dirty page is changed - no need to budget at all, because
- *       the page budget has been acquired by earlier, when the page has been
- *       marked dirty.
- *
- * UBIFS budgeting sub-system may force write-back if it thinks there is no
- * space to reserve. This imposes some locking restrictions and makes it
- * impossible to take into account the above cases, and makes it impossible to
- * optimize budgeting.
- *
- * The solution for this is that the fast path of 'ubifs_write_begin()' assumes
- * there is a plenty of flash space and the budget will be acquired quickly,
- * without forcing write-back. The slow path does not make this assumption.
- */
-static int ubifs_write_begin(struct file *file, struct address_space *mapping,
-			     loff_t pos, unsigned len, unsigned flags,
-			     struct page **pagep, void **fsdata)
-{
-	struct inode *inode = mapping->host;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-	int uninitialized_var(err), appending = !!(pos + len > inode->i_size);
-	int skipped_read = 0;
-	struct page *page;
-
-	ubifs_assert(ubifs_inode(inode)->ui_size == inode->i_size);
-	ubifs_assert(!c->ro_media && !c->ro_mount);
-
-	if (unlikely(c->ro_error))
-		return -EROFS;
-
-	/* Try out the fast-path part first */
-	page = grab_cache_page_write_begin(mapping, index, flags);
-	if (unlikely(!page))
-		return -ENOMEM;
-
-	if (!PageUptodate(page)) {
-		/* The page is not loaded from the flash */
-		if (!(pos & ~PAGE_CACHE_MASK) && len == PAGE_CACHE_SIZE) {
-			/*
-			 * We change whole page so no need to load it. But we
-			 * do not know whether this page exists on the media or
-			 * not, so we assume the latter because it requires
-			 * larger budget. The assumption is that it is better
-			 * to budget a bit more than to read the page from the
-			 * media. Thus, we are setting the @PG_checked flag
-			 * here.
-			 */
-			SetPageChecked(page);
-			skipped_read = 1;
-		} else {
-			err = do_readpage(page);
-			if (err) {
-				unlock_page(page);
-				page_cache_release(page);
-				return err;
-			}
-		}
-
-		SetPageUptodate(page);
-		ClearPageError(page);
-	}
-
-	err = allocate_budget(c, page, ui, appending);
-	if (unlikely(err)) {
-		ubifs_assert(err == -ENOSPC);
-		/*
-		 * If we skipped reading the page because we were going to
-		 * write all of it, then it is not up to date.
-		 */
-		if (skipped_read) {
-			ClearPageChecked(page);
-			ClearPageUptodate(page);
-		}
-		/*
-		 * Budgeting failed which means it would have to force
-		 * write-back but didn't, because we set the @fast flag in the
-		 * request. Write-back cannot be done now, while we have the
-		 * page locked, because it would deadlock. Unlock and free
-		 * everything and fall-back to slow-path.
-		 */
-		if (appending) {
-			ubifs_assert(mutex_is_locked(&ui->ui_mutex));
-			mutex_unlock(&ui->ui_mutex);
-		}
-		unlock_page(page);
-		page_cache_release(page);
-
-		return write_begin_slow(mapping, pos, len, pagep, flags);
-	}
-
-	/*
-	 * Whee, we acquired budgeting quickly - without involving
-	 * garbage-collection, committing or forcing write-back. We return
-	 * with @ui->ui_mutex locked if we are appending pages, and unlocked
-	 * otherwise. This is an optimization (slightly hacky though).
-	 */
-	*pagep = page;
-	return 0;
-
-}
-
-/**
- * cancel_budget - cancel budget.
- * @c: UBIFS file-system description object
- * @page: page to cancel budget for
- * @ui: UBIFS inode object the page belongs to
- * @appending: non-zero if the page is appended
- *
- * This is a helper function for a page write operation. It unlocks the
- * @ui->ui_mutex in case of appending.
- */
-static void cancel_budget(struct ubifs_info *c, struct page *page,
-			  struct ubifs_inode *ui, int appending)
-{
-	if (appending) {
-		if (!ui->dirty)
-			ubifs_release_dirty_inode_budget(c, ui);
-		mutex_unlock(&ui->ui_mutex);
-	}
-	if (!PagePrivate(page)) {
-		if (PageChecked(page))
-			release_new_page_budget(c);
-		else
-			release_existing_page_budget(c);
-	}
-}
-
-static int ubifs_write_end(struct file *file, struct address_space *mapping,
-			   loff_t pos, unsigned len, unsigned copied,
-			   struct page *page, void *fsdata)
-{
-	struct inode *inode = mapping->host;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	loff_t end_pos = pos + len;
-	int appending = !!(end_pos > inode->i_size);
-
-	dbg_gen("ino %lu, pos %llu, pg %lu, len %u, copied %d, i_size %lld",
-		inode->i_ino, pos, page->index, len, copied, inode->i_size);
-
-	if (unlikely(copied < len && len == PAGE_CACHE_SIZE)) {
-		/*
-		 * VFS copied less data to the page that it intended and
-		 * declared in its '->write_begin()' call via the @len
-		 * argument. If the page was not up-to-date, and @len was
-		 * @PAGE_CACHE_SIZE, the 'ubifs_write_begin()' function did
-		 * not load it from the media (for optimization reasons). This
-		 * means that part of the page contains garbage. So read the
-		 * page now.
-		 */
-		dbg_gen("copied %d instead of %d, read page and repeat",
-			copied, len);
-		cancel_budget(c, page, ui, appending);
-		ClearPageChecked(page);
-
-		/*
-		 * Return 0 to force VFS to repeat the whole operation, or the
-		 * error code if 'do_readpage()' fails.
-		 */
-		copied = do_readpage(page);
-		goto out;
-	}
-
-	if (!PagePrivate(page)) {
-		SetPagePrivate(page);
-		atomic_long_inc(&c->dirty_pg_cnt);
-		__set_page_dirty_nobuffers(page);
-	}
-
-	if (appending) {
-		i_size_write(inode, end_pos);
-		ui->ui_size = end_pos;
-		/*
-		 * Note, we do not set @I_DIRTY_PAGES (which means that the
-		 * inode has dirty pages), this has been done in
-		 * '__set_page_dirty_nobuffers()'.
-		 */
-		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
-		ubifs_assert(mutex_is_locked(&ui->ui_mutex));
-		mutex_unlock(&ui->ui_mutex);
-	}
-
-out:
-	unlock_page(page);
-	page_cache_release(page);
-	return copied;
-}
-
-/**
- * populate_page - copy data nodes into a page for bulk-read.
- * @c: UBIFS file-system description object
- * @page: page
- * @bu: bulk-read information
- * @n: next zbranch slot
- *
- * This function returns %0 on success and a negative error code on failure.
- */
-static int populate_page(struct ubifs_info *c, struct page *page,
-			 struct bu_info *bu, int *n)
-{
-	int i = 0, nn = *n, offs = bu->zbranch[0].offs, hole = 0, read = 0;
-	struct inode *inode = page->mapping->host;
-	loff_t i_size = i_size_read(inode);
-	unsigned int page_block;
-	void *addr, *zaddr;
-	pgoff_t end_index;
-
-	dbg_gen("ino %lu, pg %lu, i_size %lld, flags %#lx",
-		inode->i_ino, page->index, i_size, page->flags);
-
-	addr = zaddr = kmap(page);
-
-	end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
-	if (!i_size || page->index > end_index) {
-		hole = 1;
-		memset(addr, 0, PAGE_CACHE_SIZE);
-		goto out_hole;
-	}
-
-	page_block = page->index << UBIFS_BLOCKS_PER_PAGE_SHIFT;
-	while (1) {
-		int err, len, out_len, dlen;
-
-		if (nn >= bu->cnt) {
-			hole = 1;
-			memset(addr, 0, UBIFS_BLOCK_SIZE);
-		} else if (key_block(c, &bu->zbranch[nn].key) == page_block) {
-			struct ubifs_data_node *dn;
-
-			dn = bu->buf + (bu->zbranch[nn].offs - offs);
-
-			ubifs_assert(le64_to_cpu(dn->ch.sqnum) >
-				     ubifs_inode(inode)->creat_sqnum);
-
-			len = le32_to_cpu(dn->size);
-			if (len <= 0 || len > UBIFS_BLOCK_SIZE)
-				goto out_err;
-
-			dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
-			out_len = UBIFS_BLOCK_SIZE;
-			err = ubifs_decompress(&dn->data, dlen, addr, &out_len,
-					       le16_to_cpu(dn->compr_type));
-			if (err || len != out_len)
-				goto out_err;
-
-			if (len < UBIFS_BLOCK_SIZE)
-				memset(addr + len, 0, UBIFS_BLOCK_SIZE - len);
-
-			nn += 1;
-			read = (i << UBIFS_BLOCK_SHIFT) + len;
-		} else if (key_block(c, &bu->zbranch[nn].key) < page_block) {
-			nn += 1;
-			continue;
-		} else {
-			hole = 1;
-			memset(addr, 0, UBIFS_BLOCK_SIZE);
-		}
-		if (++i >= UBIFS_BLOCKS_PER_PAGE)
-			break;
-		addr += UBIFS_BLOCK_SIZE;
-		page_block += 1;
-	}
-
-	if (end_index == page->index) {
-		int len = i_size & (PAGE_CACHE_SIZE - 1);
-
-		if (len && len < read)
-			memset(zaddr + len, 0, read - len);
-	}
-
-out_hole:
-	if (hole) {
-		SetPageChecked(page);
-		dbg_gen("hole");
-	}
-
-	SetPageUptodate(page);
-	ClearPageError(page);
-	flush_dcache_page(page);
-	kunmap(page);
-	*n = nn;
-	return 0;
-
-out_err:
-	ClearPageUptodate(page);
-	SetPageError(page);
-	flush_dcache_page(page);
-	kunmap(page);
-	ubifs_err("bad data node (block %u, inode %lu)",
-		  page_block, inode->i_ino);
-	return -EINVAL;
-}
-
-/**
- * ubifs_do_bulk_read - do bulk-read.
- * @c: UBIFS file-system description object
- * @bu: bulk-read information
- * @page1: first page to read
- *
- * This function returns %1 if the bulk-read is done, otherwise %0 is returned.
- */
-static int ubifs_do_bulk_read(struct ubifs_info *c, struct bu_info *bu,
-			      struct page *page1)
-{
-	pgoff_t offset = page1->index, end_index;
-	struct address_space *mapping = page1->mapping;
-	struct inode *inode = mapping->host;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-	int err, page_idx, page_cnt, ret = 0, n = 0;
-	int allocate = bu->buf ? 0 : 1;
-	loff_t isize;
-
-	err = ubifs_tnc_get_bu_keys(c, bu);
-	if (err)
-		goto out_warn;
-
-	if (bu->eof) {
-		/* Turn off bulk-read at the end of the file */
-		ui->read_in_a_row = 1;
-		ui->bulk_read = 0;
-	}
-
-	page_cnt = bu->blk_cnt >> UBIFS_BLOCKS_PER_PAGE_SHIFT;
-	if (!page_cnt) {
-		/*
-		 * This happens when there are multiple blocks per page and the
-		 * blocks for the first page we are looking for, are not
-		 * together. If all the pages were like this, bulk-read would
-		 * reduce performance, so we turn it off for a while.
-		 */
-		goto out_bu_off;
-	}
-
-	if (bu->cnt) {
-		if (allocate) {
-			/*
-			 * Allocate bulk-read buffer depending on how many data
-			 * nodes we are going to read.
-			 */
-			bu->buf_len = bu->zbranch[bu->cnt - 1].offs +
-				      bu->zbranch[bu->cnt - 1].len -
-				      bu->zbranch[0].offs;
-			ubifs_assert(bu->buf_len > 0);
-			ubifs_assert(bu->buf_len <= c->leb_size);
-			bu->buf = kmalloc(bu->buf_len, GFP_NOFS | __GFP_NOWARN);
-			if (!bu->buf)
-				goto out_bu_off;
-		}
-
-		err = ubifs_tnc_bulk_read(c, bu);
-		if (err)
-			goto out_warn;
-	}
-
-	err = populate_page(c, page1, bu, &n);
-	if (err)
-		goto out_warn;
-
-	unlock_page(page1);
-	ret = 1;
-
-	isize = i_size_read(inode);
-	if (isize == 0)
-		goto out_free;
-	end_index = ((isize - 1) >> PAGE_CACHE_SHIFT);
-
-	for (page_idx = 1; page_idx < page_cnt; page_idx++) {
-		pgoff_t page_offset = offset + page_idx;
-		struct page *page;
-
-		if (page_offset > end_index)
-			break;
-		page = find_or_create_page(mapping, page_offset,
-					   GFP_NOFS | __GFP_COLD);
-		if (!page)
-			break;
-		if (!PageUptodate(page))
-			err = populate_page(c, page, bu, &n);
-		unlock_page(page);
-		page_cache_release(page);
-		if (err)
-			break;
-	}
-
-	ui->last_page_read = offset + page_idx - 1;
-
-out_free:
-	if (allocate)
-		kfree(bu->buf);
-	return ret;
-
-out_warn:
-	ubifs_warn("ignoring error %d and skipping bulk-read", err);
-	goto out_free;
-
-out_bu_off:
-	ui->read_in_a_row = ui->bulk_read = 0;
-	goto out_free;
-}
-
-/**
- * ubifs_bulk_read - determine whether to bulk-read and, if so, do it.
- * @page: page from which to start bulk-read.
- *
- * Some flash media are capable of reading sequentially at faster rates. UBIFS
- * bulk-read facility is designed to take advantage of that, by reading in one
- * go consecutive data nodes that are also located consecutively in the same
- * LEB. This function returns %1 if a bulk-read is done and %0 otherwise.
- */
-static int ubifs_bulk_read(struct page *page)
-{
-	struct inode *inode = page->mapping->host;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-	pgoff_t index = page->index, last_page_read = ui->last_page_read;
-	struct bu_info *bu;
-	int err = 0, allocated = 0;
-
-	ui->last_page_read = index;
-	if (!c->bulk_read)
-		return 0;
-
-	/*
-	 * Bulk-read is protected by @ui->ui_mutex, but it is an optimization,
-	 * so don't bother if we cannot lock the mutex.
-	 */
-	if (!mutex_trylock(&ui->ui_mutex))
-		return 0;
-
-	if (index != last_page_read + 1) {
-		/* Turn off bulk-read if we stop reading sequentially */
-		ui->read_in_a_row = 1;
-		if (ui->bulk_read)
-			ui->bulk_read = 0;
-		goto out_unlock;
-	}
-
-	if (!ui->bulk_read) {
-		ui->read_in_a_row += 1;
-		if (ui->read_in_a_row < 3)
-			goto out_unlock;
-		/* Three reads in a row, so switch on bulk-read */
-		ui->bulk_read = 1;
-	}
-
-	/*
-	 * If possible, try to use pre-allocated bulk-read information, which
-	 * is protected by @c->bu_mutex.
-	 */
-	if (mutex_trylock(&c->bu_mutex))
-		bu = &c->bu;
-	else {
-		bu = kmalloc(sizeof(struct bu_info), GFP_NOFS | __GFP_NOWARN);
-		if (!bu)
-			goto out_unlock;
-
-		bu->buf = NULL;
-		allocated = 1;
-	}
-
-	bu->buf_len = c->max_bu_buf_len;
-	data_key_init(c, &bu->key, inode->i_ino,
-		      page->index << UBIFS_BLOCKS_PER_PAGE_SHIFT);
-	err = ubifs_do_bulk_read(c, bu, page);
-
-	if (!allocated)
-		mutex_unlock(&c->bu_mutex);
-	else
-		kfree(bu);
-
-out_unlock:
-	mutex_unlock(&ui->ui_mutex);
-	return err;
-}
-
-static int ubifs_readpage(struct file *file, struct page *page)
-{
-	if (ubifs_bulk_read(page))
-		return 0;
-	do_readpage(page);
-	unlock_page(page);
-	return 0;
-}
-
-static int do_writepage(struct page *page, int len)
-{
-	int err = 0, i, blen;
-	unsigned int block;
-	void *addr;
-	union ubifs_key key;
-	struct inode *inode = page->mapping->host;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-
-#ifdef UBIFS_DEBUG
-	spin_lock(&ui->ui_lock);
-	ubifs_assert(page->index <= ui->synced_i_size << PAGE_CACHE_SIZE);
-	spin_unlock(&ui->ui_lock);
-#endif
-
-	/* Update radix tree tags */
-	set_page_writeback(page);
-
-	addr = kmap(page);
-	block = page->index << UBIFS_BLOCKS_PER_PAGE_SHIFT;
-	i = 0;
-	while (len) {
-		blen = min_t(int, len, UBIFS_BLOCK_SIZE);
-		data_key_init(c, &key, inode->i_ino, block);
-		err = ubifs_jnl_write_data(c, inode, &key, addr, blen);
-		if (err)
-			break;
-		if (++i >= UBIFS_BLOCKS_PER_PAGE)
-			break;
-		block += 1;
-		addr += blen;
-		len -= blen;
-	}
-	if (err) {
-		SetPageError(page);
-		ubifs_err("cannot write page %lu of inode %lu, error %d",
-			  page->index, inode->i_ino, err);
-		ubifs_ro_mode(c, err);
-	}
-
-	ubifs_assert(PagePrivate(page));
-	if (PageChecked(page))
-		release_new_page_budget(c);
-	else
-		release_existing_page_budget(c);
-
-	atomic_long_dec(&c->dirty_pg_cnt);
-	ClearPagePrivate(page);
-	ClearPageChecked(page);
-
-	kunmap(page);
-	unlock_page(page);
-	end_page_writeback(page);
-	return err;
-}
-
-/*
- * When writing-back dirty inodes, VFS first writes-back pages belonging to the
- * inode, then the inode itself. For UBIFS this may cause a problem. Consider a
- * situation when a we have an inode with size 0, then a megabyte of data is
- * appended to the inode, then write-back starts and flushes some amount of the
- * dirty pages, the journal becomes full, commit happens and finishes, and then
- * an unclean reboot happens. When the file system is mounted next time, the
- * inode size would still be 0, but there would be many pages which are beyond
- * the inode size, they would be indexed and consume flash space. Because the
- * journal has been committed, the replay would not be able to detect this
- * situation and correct the inode size. This means UBIFS would have to scan
- * whole index and correct all inode sizes, which is long an unacceptable.
- *
- * To prevent situations like this, UBIFS writes pages back only if they are
- * within the last synchronized inode size, i.e. the size which has been
- * written to the flash media last time. Otherwise, UBIFS forces inode
- * write-back, thus making sure the on-flash inode contains current inode size,
- * and then keeps writing pages back.
- *
- * Some locking issues explanation. 'ubifs_writepage()' first is called with
- * the page locked, and it locks @ui_mutex. However, write-back does take inode
- * @i_mutex, which means other VFS operations may be run on this inode at the
- * same time. And the problematic one is truncation to smaller size, from where
- * we have to call 'truncate_setsize()', which first changes @inode->i_size,
- * then drops the truncated pages. And while dropping the pages, it takes the
- * page lock. This means that 'do_truncation()' cannot call 'truncate_setsize()'
- * with @ui_mutex locked, because it would deadlock with 'ubifs_writepage()'.
- * This means that @inode->i_size is changed while @ui_mutex is unlocked.
- *
- * XXX(truncate): with the new truncate sequence this is not true anymore,
- * and the calls to truncate_setsize can be move around freely.  They should
- * be moved to the very end of the truncate sequence.
- *
- * But in 'ubifs_writepage()' we have to guarantee that we do not write beyond
- * inode size. How do we do this if @inode->i_size may became smaller while we
- * are in the middle of 'ubifs_writepage()'? The UBIFS solution is the
- * @ui->ui_isize "shadow" field which UBIFS uses instead of @inode->i_size
- * internally and updates it under @ui_mutex.
- *
- * Q: why we do not worry that if we race with truncation, we may end up with a
- * situation when the inode is truncated while we are in the middle of
- * 'do_writepage()', so we do write beyond inode size?
- * A: If we are in the middle of 'do_writepage()', truncation would be locked
- * on the page lock and it would not write the truncated inode node to the
- * journal before we have finished.
- */
-static int ubifs_writepage(struct page *page, struct writeback_control *wbc)
-{
-	struct inode *inode = page->mapping->host;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-	loff_t i_size =  i_size_read(inode), synced_i_size;
-	pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
-	int err, len = i_size & (PAGE_CACHE_SIZE - 1);
-	void *kaddr;
-
-	dbg_gen("ino %lu, pg %lu, pg flags %#lx",
-		inode->i_ino, page->index, page->flags);
-	ubifs_assert(PagePrivate(page));
-
-	/* Is the page fully outside @i_size? (truncate in progress) */
-	if (page->index > end_index || (page->index == end_index && !len)) {
-		err = 0;
-		goto out_unlock;
-	}
-
-	spin_lock(&ui->ui_lock);
-	synced_i_size = ui->synced_i_size;
-	spin_unlock(&ui->ui_lock);
-
-	/* Is the page fully inside @i_size? */
-	if (page->index < end_index) {
-		if (page->index >= synced_i_size >> PAGE_CACHE_SHIFT) {
-			err = inode->i_sb->s_op->write_inode(inode, NULL);
-			if (err)
-				goto out_unlock;
-			/*
-			 * The inode has been written, but the write-buffer has
-			 * not been synchronized, so in case of an unclean
-			 * reboot we may end up with some pages beyond inode
-			 * size, but they would be in the journal (because
-			 * commit flushes write buffers) and recovery would deal
-			 * with this.
-			 */
-		}
-		return do_writepage(page, PAGE_CACHE_SIZE);
-	}
-
-	/*
-	 * The page straddles @i_size. It must be zeroed out on each and every
-	 * writepage invocation because it may be mmapped. "A file is mapped
-	 * in multiples of the page size. For a file that is not a multiple of
-	 * the page size, the remaining memory is zeroed when mapped, and
-	 * writes to that region are not written out to the file."
-	 */
-	kaddr = kmap_atomic(page);
-	memset(kaddr + len, 0, PAGE_CACHE_SIZE - len);
-	flush_dcache_page(page);
-	kunmap_atomic(kaddr);
-
-	if (i_size > synced_i_size) {
-		err = inode->i_sb->s_op->write_inode(inode, NULL);
-		if (err)
-			goto out_unlock;
-	}
-
-	return do_writepage(page, len);
-
-out_unlock:
-	unlock_page(page);
-	return err;
-}
-
-/**
- * do_attr_changes - change inode attributes.
- * @inode: inode to change attributes for
- * @attr: describes attributes to change
- */
-static void do_attr_changes(struct inode *inode, const struct iattr *attr)
-{
-	if (attr->ia_valid & ATTR_UID)
-		inode->i_uid = attr->ia_uid;
-	if (attr->ia_valid & ATTR_GID)
-		inode->i_gid = attr->ia_gid;
-	if (attr->ia_valid & ATTR_ATIME)
-		inode->i_atime = timespec_trunc(attr->ia_atime,
-						inode->i_sb->s_time_gran);
-	if (attr->ia_valid & ATTR_MTIME)
-		inode->i_mtime = timespec_trunc(attr->ia_mtime,
-						inode->i_sb->s_time_gran);
-	if (attr->ia_valid & ATTR_CTIME)
-		inode->i_ctime = timespec_trunc(attr->ia_ctime,
-						inode->i_sb->s_time_gran);
-	if (attr->ia_valid & ATTR_MODE) {
-		umode_t mode = attr->ia_mode;
-
-		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
-			mode &= ~S_ISGID;
-		inode->i_mode = mode;
-	}
-}
-
-/**
- * do_truncation - truncate an inode.
- * @c: UBIFS file-system description object
- * @inode: inode to truncate
- * @attr: inode attribute changes description
- *
- * This function implements VFS '->setattr()' call when the inode is truncated
- * to a smaller size. Returns zero in case of success and a negative error code
- * in case of failure.
- */
-static int do_truncation(struct ubifs_info *c, struct inode *inode,
-			 const struct iattr *attr)
-{
-	int err;
-	struct ubifs_budget_req req;
-	loff_t old_size = inode->i_size, new_size = attr->ia_size;
-	int offset = new_size & (UBIFS_BLOCK_SIZE - 1), budgeted = 1;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-
-	dbg_gen("ino %lu, size %lld -> %lld", inode->i_ino, old_size, new_size);
-	memset(&req, 0, sizeof(struct ubifs_budget_req));
-
-	/*
-	 * If this is truncation to a smaller size, and we do not truncate on a
-	 * block boundary, budget for changing one data block, because the last
-	 * block will be re-written.
-	 */
-	if (new_size & (UBIFS_BLOCK_SIZE - 1))
-		req.dirtied_page = 1;
-
-	req.dirtied_ino = 1;
-	/* A funny way to budget for truncation node */
-	req.dirtied_ino_d = UBIFS_TRUN_NODE_SZ;
-	err = ubifs_budget_space(c, &req);
-	if (err) {
-		/*
-		 * Treat truncations to zero as deletion and always allow them,
-		 * just like we do for '->unlink()'.
-		 */
-		if (new_size || err != -ENOSPC)
-			return err;
-		budgeted = 0;
-	}
-
-	truncate_setsize(inode, new_size);
-
-	if (offset) {
-		pgoff_t index = new_size >> PAGE_CACHE_SHIFT;
-		struct page *page;
-
-		page = find_lock_page(inode->i_mapping, index);
-		if (page) {
-			if (PageDirty(page)) {
-				/*
-				 * 'ubifs_jnl_truncate()' will try to truncate
-				 * the last data node, but it contains
-				 * out-of-date data because the page is dirty.
-				 * Write the page now, so that
-				 * 'ubifs_jnl_truncate()' will see an already
-				 * truncated (and up to date) data node.
-				 */
-				ubifs_assert(PagePrivate(page));
-
-				clear_page_dirty_for_io(page);
-				if (UBIFS_BLOCKS_PER_PAGE_SHIFT)
-					offset = new_size &
-						 (PAGE_CACHE_SIZE - 1);
-				err = do_writepage(page, offset);
-				page_cache_release(page);
-				if (err)
-					goto out_budg;
-				/*
-				 * We could now tell 'ubifs_jnl_truncate()' not
-				 * to read the last block.
-				 */
-			} else {
-				/*
-				 * We could 'kmap()' the page and pass the data
-				 * to 'ubifs_jnl_truncate()' to save it from
-				 * having to read it.
-				 */
-				unlock_page(page);
-				page_cache_release(page);
-			}
-		}
-	}
-
-	mutex_lock(&ui->ui_mutex);
-	ui->ui_size = inode->i_size;
-	/* Truncation changes inode [mc]time */
-	inode->i_mtime = inode->i_ctime = ubifs_current_time(inode);
-	/* Other attributes may be changed at the same time as well */
-	do_attr_changes(inode, attr);
-	err = ubifs_jnl_truncate(c, inode, old_size, new_size);
-	mutex_unlock(&ui->ui_mutex);
-
-out_budg:
-	if (budgeted)
-		ubifs_release_budget(c, &req);
-	else {
-		c->bi.nospace = c->bi.nospace_rp = 0;
-		smp_wmb();
-	}
-	return err;
-}
-
-/**
- * do_setattr - change inode attributes.
- * @c: UBIFS file-system description object
- * @inode: inode to change attributes for
- * @attr: inode attribute changes description
- *
- * This function implements VFS '->setattr()' call for all cases except
- * truncations to smaller size. Returns zero in case of success and a negative
- * error code in case of failure.
- */
-static int do_setattr(struct ubifs_info *c, struct inode *inode,
-		      const struct iattr *attr)
-{
-	int err, release;
-	loff_t new_size = attr->ia_size;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-	struct ubifs_budget_req req = { .dirtied_ino = 1,
-				.dirtied_ino_d = ALIGN(ui->data_len, 8) };
-
-	err = ubifs_budget_space(c, &req);
-	if (err)
-		return err;
-
-	if (attr->ia_valid & ATTR_SIZE) {
-		dbg_gen("size %lld -> %lld", inode->i_size, new_size);
-		truncate_setsize(inode, new_size);
-	}
-
-	mutex_lock(&ui->ui_mutex);
-	if (attr->ia_valid & ATTR_SIZE) {
-		/* Truncation changes inode [mc]time */
-		inode->i_mtime = inode->i_ctime = ubifs_current_time(inode);
-		/* 'truncate_setsize()' changed @i_size, update @ui_size */
-		ui->ui_size = inode->i_size;
-	}
-
-	do_attr_changes(inode, attr);
-
-	release = ui->dirty;
-	if (attr->ia_valid & ATTR_SIZE)
-		/*
-		 * Inode length changed, so we have to make sure
-		 * @I_DIRTY_DATASYNC is set.
-		 */
-		 __mark_inode_dirty(inode, I_DIRTY_SYNC | I_DIRTY_DATASYNC);
-	else
-		mark_inode_dirty_sync(inode);
-	mutex_unlock(&ui->ui_mutex);
-
-	if (release)
-		ubifs_release_budget(c, &req);
-	if (IS_SYNC(inode))
-		err = inode->i_sb->s_op->write_inode(inode, NULL);
-	return err;
-}
-
-int ubifs_setattr(struct dentry *dentry, struct iattr *attr)
-{
-	int err;
-	struct inode *inode = dentry->d_inode;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-
-	dbg_gen("ino %lu, mode %#x, ia_valid %#x",
-		inode->i_ino, inode->i_mode, attr->ia_valid);
-	err = inode_change_ok(inode, attr);
-	if (err)
-		return err;
-
-	err = dbg_check_synced_i_size(c, inode);
-	if (err)
-		return err;
-
-	if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size < inode->i_size)
-		/* Truncation to a smaller size */
-		err = do_truncation(c, inode, attr);
-	else
-		err = do_setattr(c, inode, attr);
-
-	return err;
-}
-
-static void ubifs_invalidatepage(struct page *page, unsigned long offset)
-{
-	struct inode *inode = page->mapping->host;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-
-	ubifs_assert(PagePrivate(page));
-	if (offset)
-		/* Partial page remains dirty */
-		return;
-
-	if (PageChecked(page))
-		release_new_page_budget(c);
-	else
-		release_existing_page_budget(c);
-
-	atomic_long_dec(&c->dirty_pg_cnt);
-	ClearPagePrivate(page);
-	ClearPageChecked(page);
-}
-
-static void *ubifs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
-	struct ubifs_inode *ui = ubifs_inode(dentry->d_inode);
-
-	nd_set_link(nd, ui->data);
-	return NULL;
-}
-
-int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
-{
-	struct inode *inode = file->f_mapping->host;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	int err;
-
-	dbg_gen("syncing inode %lu", inode->i_ino);
-
-	if (c->ro_mount)
-		/*
-		 * For some really strange reasons VFS does not filter out
-		 * 'fsync()' for R/O mounted file-systems as per 2.6.39.
-		 */
-		return 0;
-	
-	if (c->vfs_sb->s_flags & MS_RDONLY)
-		return 0;
-	
-	err = filemap_write_and_wait_range(inode->i_mapping, start, end);
-	if (err)
-		return err;
-	mutex_lock(&inode->i_mutex);
-
-	/* Synchronize the inode unless this is a 'datasync()' call. */
-	if (!datasync || (inode->i_state & I_DIRTY_DATASYNC)) {
-		err = inode->i_sb->s_op->write_inode(inode, NULL);
-		if (err)
-			goto out;
-	}
-
-	/*
-	 * Nodes related to this inode may still sit in a write-buffer. Flush
-	 * them.
-	 */
-	err = ubifs_sync_wbufs_by_inode(c, inode);
-out:
-	mutex_unlock(&inode->i_mutex);
-	return err;
-}
-
-/**
- * mctime_update_needed - check if mtime or ctime update is needed.
- * @inode: the inode to do the check for
- * @now: current time
- *
- * This helper function checks if the inode mtime/ctime should be updated or
- * not. If current values of the time-stamps are within the UBIFS inode time
- * granularity, they are not updated. This is an optimization.
- */
-static inline int mctime_update_needed(const struct inode *inode,
-				       const struct timespec *now)
-{
-	if (!timespec_equal(&inode->i_mtime, now) ||
-	    !timespec_equal(&inode->i_ctime, now))
-		return 1;
-	return 0;
-}
-
-/**
- * update_ctime - update mtime and ctime of an inode.
- * @c: UBIFS file-system description object
- * @inode: inode to update
- *
- * This function updates mtime and ctime of the inode if it is not equivalent to
- * current time. Returns zero in case of success and a negative error code in
- * case of failure.
- */
-static int update_mctime(struct ubifs_info *c, struct inode *inode)
-{
-	struct timespec now = ubifs_current_time(inode);
-	struct ubifs_inode *ui = ubifs_inode(inode);
-
-	if (mctime_update_needed(inode, &now)) {
-		int err, release;
-		struct ubifs_budget_req req = { .dirtied_ino = 1,
-				.dirtied_ino_d = ALIGN(ui->data_len, 8) };
-
-		err = ubifs_budget_space(c, &req);
-		if (err)
-			return err;
-
-		mutex_lock(&ui->ui_mutex);
-		inode->i_mtime = inode->i_ctime = ubifs_current_time(inode);
-		release = ui->dirty;
-		mark_inode_dirty_sync(inode);
-		mutex_unlock(&ui->ui_mutex);
-		if (release)
-			ubifs_release_budget(c, &req);
-	}
-
-	return 0;
-}
-
-static ssize_t ubifs_aio_write(struct kiocb *iocb, const struct iovec *iov,
-			       unsigned long nr_segs, loff_t pos)
-{
-	int err;
-	struct inode *inode = iocb->ki_filp->f_mapping->host;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-
-	err = update_mctime(c, inode);
-	if (err)
-		return err;
-
-	return generic_file_aio_write(iocb, iov, nr_segs, pos);
-}
-
-static int ubifs_set_page_dirty(struct page *page)
-{
-	int ret;
-
-	ret = __set_page_dirty_nobuffers(page);
-	/*
-	 * An attempt to dirty a page without budgeting for it - should not
-	 * happen.
-	 */
-	ubifs_assert(ret == 0);
-	return ret;
-}
-
-static int ubifs_releasepage(struct page *page, gfp_t unused_gfp_flags)
-{
-	/*
-	 * An attempt to release a dirty page without budgeting for it - should
-	 * not happen.
-	 */
-	if (PageWriteback(page))
-		return 0;
-	ubifs_assert(PagePrivate(page));
-	ubifs_assert(0);
-	ClearPagePrivate(page);
-	ClearPageChecked(page);
-	return 1;
-}
-
-/*
- * mmap()d file has taken write protection fault and is being made writable.
- * UBIFS must ensure page is budgeted for.
- */
-static int ubifs_vm_page_mkwrite(struct vm_area_struct *vma,
-				 struct vm_fault *vmf)
-{
-	struct page *page = vmf->page;
-	struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	struct timespec now = ubifs_current_time(inode);
-	struct ubifs_budget_req req = { .new_page = 1 };
-	int err, update_time;
-
-	dbg_gen("ino %lu, pg %lu, i_size %lld",	inode->i_ino, page->index,
-		i_size_read(inode));
-	ubifs_assert(!c->ro_media && !c->ro_mount);
-
-	if (unlikely(c->ro_error))
-		return VM_FAULT_SIGBUS; /* -EROFS */
-
-	/*
-	 * We have not locked @page so far so we may budget for changing the
-	 * page. Note, we cannot do this after we locked the page, because
-	 * budgeting may cause write-back which would cause deadlock.
-	 *
-	 * At the moment we do not know whether the page is dirty or not, so we
-	 * assume that it is not and budget for a new page. We could look at
-	 * the @PG_private flag and figure this out, but we may race with write
-	 * back and the page state may change by the time we lock it, so this
-	 * would need additional care. We do not bother with this at the
-	 * moment, although it might be good idea to do. Instead, we allocate
-	 * budget for a new page and amend it later on if the page was in fact
-	 * dirty.
-	 *
-	 * The budgeting-related logic of this function is similar to what we
-	 * do in 'ubifs_write_begin()' and 'ubifs_write_end()'. Glance there
-	 * for more comments.
-	 */
-	update_time = mctime_update_needed(inode, &now);
-	if (update_time)
-		/*
-		 * We have to change inode time stamp which requires extra
-		 * budgeting.
-		 */
-		req.dirtied_ino = 1;
-
-	err = ubifs_budget_space(c, &req);
-	if (unlikely(err)) {
-		if (err == -ENOSPC)
-			ubifs_warn("out of space for mmapped file "
-				   "(inode number %lu)", inode->i_ino);
-		return VM_FAULT_SIGBUS;
-	}
-
-	lock_page(page);
-	if (unlikely(page->mapping != inode->i_mapping ||
-		     page_offset(page) > i_size_read(inode))) {
-		/* Page got truncated out from underneath us */
-		err = -EINVAL;
-		goto out_unlock;
-	}
-
-	if (PagePrivate(page))
-		release_new_page_budget(c);
-	else {
-		if (!PageChecked(page))
-			ubifs_convert_page_budget(c);
-		SetPagePrivate(page);
-		atomic_long_inc(&c->dirty_pg_cnt);
-		__set_page_dirty_nobuffers(page);
-	}
-
-	if (update_time) {
-		int release;
-		struct ubifs_inode *ui = ubifs_inode(inode);
-
-		mutex_lock(&ui->ui_mutex);
-		inode->i_mtime = inode->i_ctime = ubifs_current_time(inode);
-		release = ui->dirty;
-		mark_inode_dirty_sync(inode);
-		mutex_unlock(&ui->ui_mutex);
-		if (release)
-			ubifs_release_dirty_inode_budget(c, ui);
-	}
-
-	unlock_page(page);
-	return 0;
-
-out_unlock:
-	unlock_page(page);
-	ubifs_release_budget(c, &req);
-	if (err)
-		err = VM_FAULT_SIGBUS;
-	return err;
-}
-
-static const struct vm_operations_struct ubifs_file_vm_ops = {
-	.fault        = filemap_fault,
-	.page_mkwrite = ubifs_vm_page_mkwrite,
-};
-
-static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	int err;
-
-	err = generic_file_mmap(file, vma);
-	if (err)
-		return err;
-	vma->vm_ops = &ubifs_file_vm_ops;
-	return 0;
-}
-
-const struct address_space_operations ubifs_file_address_operations = {
-	.readpage       = ubifs_readpage,
-	.writepage      = ubifs_writepage,
-	.write_begin    = ubifs_write_begin,
-	.write_end      = ubifs_write_end,
-	.invalidatepage = ubifs_invalidatepage,
-	.set_page_dirty = ubifs_set_page_dirty,
-	.releasepage    = ubifs_releasepage,
-};
-
-const struct inode_operations ubifs_file_inode_operations = {
-	.setattr     = ubifs_setattr,
-	.getattr     = ubifs_getattr,
-#ifdef CONFIG_UBIFS_FS_XATTR
-	.setxattr    = ubifs_setxattr,
-	.getxattr    = ubifs_getxattr,
-	.listxattr   = ubifs_listxattr,
-	.removexattr = ubifs_removexattr,
-#endif
-};
-
-const struct inode_operations ubifs_symlink_inode_operations = {
-	.readlink    = generic_readlink,
-	.follow_link = ubifs_follow_link,
-	.setattr     = ubifs_setattr,
-	.getattr     = ubifs_getattr,
-};
-
-const struct file_operations ubifs_file_operations = {
-	.llseek         = generic_file_llseek,
-	.read           = do_sync_read,
-	.write          = do_sync_write,
-	.aio_read       = generic_file_aio_read,
-	.aio_write      = ubifs_aio_write,
-	.mmap           = ubifs_file_mmap,
-	.fsync          = ubifs_fsync,
-	.unlocked_ioctl = ubifs_ioctl,
-	.splice_read	= generic_file_splice_read,
-	.splice_write	= generic_file_splice_write,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl   = ubifs_compat_ioctl,
-#endif
-};