cregit-Linux how code gets into the kernel

Release 4.11 fs/freevxfs/vxfs_subr.c

Directory: fs/freevxfs
/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Veritas filesystem driver - shared subroutines.
 */
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kernel.h>
#include <linux/pagemap.h>

#include "vxfs_extern.h"


static int		vxfs_readpage(struct file *, struct page *);
static sector_t		vxfs_bmap(struct address_space *, sector_t);


const struct address_space_operations vxfs_aops = {
	.readpage =		vxfs_readpage,
	.bmap =			vxfs_bmap,
};


inline void vxfs_put_page(struct page *pp) { kunmap(pp); put_page(pp); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton2095.24%150.00%
Kirill A. Shutemov14.76%150.00%
Total21100.00%2100.00%

/** * vxfs_get_page - read a page into memory. * @ip: inode to read from * @n: page number * * Description: * vxfs_get_page reads the @n th page of @ip into the pagecache. * * Returns: * The wanted page on success, else a NULL pointer. */
struct page * vxfs_get_page(struct address_space *mapping, u_long n) { struct page * pp; pp = read_mapping_page(mapping, n, NULL); if (!IS_ERR(pp)) { kmap(pp); /** if (!PageChecked(pp)) **/ /** vxfs_check_page(pp); **/ if (PageError(pp)) goto fail; } return (pp); fail: vxfs_put_page(pp); return ERR_PTR(-EIO); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds7698.70%266.67%
Pekka J Enberg11.30%133.33%
Total77100.00%3100.00%

/** * vxfs_bread - read buffer for a give inode,block tuple * @ip: inode * @block: logical block * * Description: * The vxfs_bread function reads block no @block of * @ip into the buffercache. * * Returns: * The resulting &struct buffer_head. */
struct buffer_head * vxfs_bread(struct inode *ip, int block) { struct buffer_head *bp; daddr_t pblock; pblock = vxfs_bmap1(ip, block); bp = sb_bread(ip->i_sb, pblock); return (bp); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds48100.00%2100.00%
Total48100.00%2100.00%

/** * vxfs_get_block - locate buffer for given inode,block tuple * @ip: inode * @iblock: logical block * @bp: buffer skeleton * @create: %TRUE if blocks may be newly allocated. * * Description: * The vxfs_get_block function fills @bp with the right physical * block and device number to perform a lowlevel read/write on * it. * * Returns: * Zero on success, else a negativ error code (-EIO). */
static int vxfs_getblk(struct inode *ip, sector_t iblock, struct buffer_head *bp, int create) { daddr_t pblock; pblock = vxfs_bmap1(ip, iblock); if (pblock != 0) { map_bh(bp, ip->i_sb, pblock); return 0; } return -EIO; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds60100.00%3100.00%
Total60100.00%3100.00%

/** * vxfs_readpage - read one page synchronously into the pagecache * @file: file context (unused) * @page: page frame to fill in. * * Description: * The vxfs_readpage routine reads @page synchronously into the * pagecache. * * Returns: * Zero on success, else a negative error code. * * Locking status: * @page is locked and will be unlocked. */
static int vxfs_readpage(struct file *file, struct page *page) { return block_read_full_page(page, vxfs_getblk); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds24100.00%1100.00%
Total24100.00%1100.00%

/** * vxfs_bmap - perform logical to physical block mapping * @mapping: logical to physical mapping to use * @block: logical block (relative to @mapping). * * Description: * Vxfs_bmap find out the corresponding phsical block to the * @mapping, @block pair. * * Returns: * Physical block number on success, else Zero. * * Locking status: * We are under the bkl. */
static sector_t vxfs_bmap(struct address_space *mapping, sector_t block) { return generic_block_bmap(mapping, block, vxfs_getblk); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2291.67%150.00%
Andrew Morton28.33%150.00%
Total24100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds28790.54%650.00%
Andrew Morton247.57%216.67%
Christoph Hellwig41.26%216.67%
Kirill A. Shutemov10.32%18.33%
Pekka J Enberg10.32%18.33%
Total317100.00%12100.00%
Directory: fs/freevxfs
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