/**
 * aops.h - Defines for NTFS kernel address space operations and page cache
 *	    handling.  Part of the Linux-NTFS project.
 *
 * Copyright (c) 2001-2004 Anton Altaparmakov
 * Copyright (c) 2002 Richard Russon
 *
 * This program/include file 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.
 *
 * This program/include file 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 (in the main directory of the Linux-NTFS
 * distribution in the file COPYING); if not, write to the Free Software
 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _LINUX_NTFS_AOPS_H
#define _LINUX_NTFS_AOPS_H

#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/fs.h>

#include "inode.h"

/**
 * ntfs_unmap_page - release a page that was mapped using ntfs_map_page()
 * @page:	the page to release
 *
 * Unpin, unmap and release a page that was obtained from ntfs_map_page().
 */
static inline void ntfs_unmap_page(struct page *page)
{
	kunmap(page);
	put_page(page);
}

/**
 * ntfs_map_page - map a page into accessible memory, reading it if necessary
 * @mapping:	address space for which to obtain the page
 * @index:	index into the page cache for @mapping of the page to map
 *
 * Read a page from the page cache of the address space @mapping at position
 * @index, where @index is in units of PAGE_SIZE, and not in bytes.
 *
 * If the page is not in memory it is loaded from disk first using the readpage
 * method defined in the address space operations of @mapping and the page is
 * added to the page cache of @mapping in the process.
 *
 * If the page belongs to an mst protected attribute and it is marked as such
 * in its ntfs inode (NInoMstProtected()) the mst fixups are applied but no
 * error checking is performed.  This means the caller has to verify whether
 * the ntfs record(s) contained in the page are valid or not using one of the
 * ntfs_is_XXXX_record{,p}() macros, where XXXX is the record type you are
 * expecting to see.  (For details of the macros, see fs/ntfs/layout.h.)
 *
 * If the page is in high memory it is mapped into memory directly addressible
 * by the kernel.
 *
 * Finally the page count is incremented, thus pinning the page into place.
 *
 * The above means that page_address(page) can be used on all pages obtained
 * with ntfs_map_page() to get the kernel virtual address of the page.
 *
 * When finished with the page, the caller has to call ntfs_unmap_page() to
 * unpin, unmap and release the page.
 *
 * Note this does not grant exclusive access. If such is desired, the caller
 * must provide it independently of the ntfs_{un}map_page() calls by using
 * a {rw_}semaphore or other means of serialization. A spin lock cannot be
 * used as ntfs_map_page() can block.
 *
 * The unlocked and uptodate page is returned on success or an encoded error
 * on failure. Caller has to test for error using the IS_ERR() macro on the
 * return value. If that evaluates to 'true', the negative error code can be
 * obtained using PTR_ERR() on the return value of ntfs_map_page().
 */
static inline struct page *ntfs_map_page(struct address_space *mapping,
		unsigned long index)
{
	struct page *page = read_mapping_page(mapping, index, NULL);

	if (!IS_ERR(page)) {
		kmap(page);
		if (!PageError(page))
			return page;
		ntfs_unmap_page(page);
		return ERR_PTR(-EIO);
	}
	return page;
}

#ifdef NTFS_RW

extern void mark_ntfs_record_dirty(struct page *page, const unsigned int ofs);

#endif /* NTFS_RW */

#endif /* _LINUX_NTFS_AOPS_H */
with csum errors</a></td><td>Eric Dumazet</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2017-02-04 19:44:22 -0500'>2017-02-04</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>netlabel: out of bound access in cipso_v4_validate()</a></td><td>Eric Dumazet</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+4</span></td></tr>
<tr><td><span title='2017-02-04 12:18:01 -0800'>2017-02-04</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=a572a1b999489efb591287632279c6c9eca3e4ed'>Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ker...</a></td><td>Linus Torvalds</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+17</span></td></tr>
<tr><td><span title='2017-02-04 10:44:15 -0800'>2017-02-04</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=412e6d3fec247b2bc83106514b0fb3b17e2eb7fe'>Merge tag 'char-misc-4.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/g...</a></td><td>Linus Torvalds</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+30</span></td></tr>
<tr><td><span title='2017-02-03 14:13:19 -0800'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=a96dfddbcc04336bbed50dc2b24823e45e09e80c'>base/memory, hotplug: fix a kernel oops in show_valid_zones()</a></td><td>Toshi Kani</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2017-02-03 11:32:25 -0800'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=79c9089f97d37ffac88c3ddb6d359b2cf75058b7'>Merge tag 'drm-fixes-for-v4.10-rc7' of git://people.freedesktop.org/~airlied/...</a></td><td>Linus Torvalds</td><td>2</td><td><span class='deletions'>-1</span>/<span class='insertions'>+16</span></td></tr>
<tr><td><span title='2017-02-03 10:30:27 -0800'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=2cb54ce9ee92ae627bc1cef8bea236905910a86d'>Merge branch 'modversions' (modversions fixes for powerpc from Ard)</a></td><td>Linus Torvalds</td><td>3</td><td><span class='deletions'>-17</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2017-02-03 09:56:43 -0800'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=29905b52fad0854351f57bab867647e4982285bf'>log2: make order_base_2() behave correctly on const input value zero</a></td><td>Ard Biesheuvel</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+12</span></td></tr>
<tr><td><span title='2017-02-03 08:28:25 -0800'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=4b9eee96fcb361a5e16a8d2619825e8a048f81f7'>module: unify absolute krctab definitions for 32-bit and 64-bit</a></td><td>Ard Biesheuvel</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+0</span></td></tr>
<tr><td><span title='2017-02-03 08:28:25 -0800'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=71810db27c1c853b335675bee335d893bc3d324b'>modversions: treat symbol CRCs as 32 bit quantities</a></td><td>Ard Biesheuvel</td><td>3</td><td><span class='deletions'>-12</span>/<span class='insertions'>+27</span></td></tr>
<tr><td><span title='2017-02-03 11:05:23 -0500'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=013e8167899d389075160412a8c0c5e0581e1f13'>ipv6: sr: remove cleanup flag and fix HMAC computation</a></td><td>David Lebrun</td><td>1</td><td><span class='deletions'>-6</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2017-02-02 13:30:19 -0800'>2017-02-02</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=891aa1e0f13c3aaa756c69b343d6ab6f3357009b'>Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ke...</a></td><td>Linus Torvalds</td><td>1</td><td><span class='deletions'>-3</span>/<span class='insertions'>+0</span></td></tr>
<tr><td><span title='2017-02-01 11:52:27 -0800'>2017-02-01</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=6d04dfc8966019b8b0977b2cb942351f13d2b178'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</a></td><td>Linus Torvalds</td><td>4</td><td><span class='deletions'>-19</span>/<span class='insertions'>+26</span></td></tr>
<tr><td><span title='2017-02-01 10:30:56 -0800'>2017-02-01</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=2883aaea363f7a897ff06d2e6c73ae7aae285bcb'>Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vir...</a></td><td>Linus Torvalds</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2017-02-01 12:10:56 -0500'>2017-02-01</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=1a2a14444d32b89b28116daea86f63ced1716668'>net: fix ndo_features_check/ndo_fix_features comment ordering</a></td><td>Dimitris Michailidis</td><td>1</td><td><span class='deletions'>-14</span>/<span class='insertions'>+15</span></td></tr>
<tr><td><span title='2017-02-01 08:37:27 +0100'>2017-02-01</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/include?id=fff4b87e594ad3d2e4f51e8d3d86a6f9d3d8b654'>perf/x86/intel/uncore: Make package handling more robust</a></td><td>Thomas Gleixner</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+0</span></td></tr>