/** * 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 #include #include #include #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 */ space:mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-24 21:30:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-24 21:30:19 -0700
commitb5cd891716a9ef118ce8d3a367b6b0fa912447fc (patch)
tree026a2f00b2876c43cc8287b7ffadf1e4061dc200 /Documentation/arm/tcm.txt
parent1ce5bdb8312b6e9629029340063ea1e5cfac435d (diff)
parent91bbc174d45c347aa7aedb2215cc7d2013c06c1f (diff)
Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk fixes from Stephen Boyd: "This is the first batch of clk driver fixes for this release. We have a handful of fixes for the uniphier clk driver that was introduced recently, as well as Kconfig option hiding, module autoloading markings, and a few fixes for clk_hw based registration patches that went in this merge window" * tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: clk: at91: Fix a return value in case of error clk: uniphier: rename MIO clock to SD clock for Pro5, PXs2, LD20 SoCs clk: uniphier: fix memory overrun bug clk: hi6220: use CLK_OF_DECLARE_DRIVER for sysctrl and mediactrl clock init clk: mvebu: armada-37xx-periph: Fix the clock gate flag clk: bcm2835: Clamp the PLL's requested rate to the hardware limits. clk: max77686: fix number of clocks setup for clk_hw based registration clk: mvebu: armada-37xx-periph: Fix the clock provider registration clk: core: add __init decoration for CLK_OF_DECLARE_DRIVER function clk: mediatek: Add hardware dependency clk: samsung: clk-exynos-audss: Fix module autoload clk: uniphier: fix type of variable passed to regmap_read() clk: uniphier: add system clock support for sLD3 SoC
Diffstat (limited to 'Documentation/arm/tcm.txt')