/*
* Copyright (C) 2005, 2006
* Avishay Traeger (avishay@gmail.com)
* Copyright (C) 2008, 2009
* Boaz Harrosh <bharrosh@panasas.com>
*
* Copyrights for code taken from ext2:
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
* from
* linux/fs/minix/inode.c
* Copyright (C) 1991, 1992 Linus Torvalds
*
* This file is part of exofs.
*
* exofs 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. Since it is based on ext2, and the only
* valid version of GPL for the Linux kernel is version 2, the only valid
* version of GPL for exofs is version 2.
*
* exofs 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 exofs; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <scsi/scsi_device.h>
#include "exofs.h"
#ifdef CONFIG_EXOFS_DEBUG
# define EXOFS_DEBUG_OBJ_ISIZE 1
#endif
#define EXOFS_DBGMSG2(M...) do {} while (0)
struct page_collect {
struct exofs_sb_info *sbi;
struct request_queue *req_q;
struct inode *inode;
unsigned expected_pages;
struct bio *bio;
unsigned nr_pages;
unsigned long length;
loff_t pg_first; /* keep 64bit also in 32-arches */
};
static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
struct inode *inode)
{
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
pcol->sbi = sbi;
pcol->req_q = osd_request_queue(sbi->s_dev);
pcol->inode = inode;
pcol->expected_pages = expected_pages;
pcol->bio = NULL;
pcol->nr_pages = 0;
pcol->length = 0;
pcol->pg_first = -1;
EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino,
expected_pages);
}
static void _pcol_reset(struct page_collect *pcol)
{
pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
pcol->bio = NULL;
pcol->nr_pages = 0;
pcol->length = 0;
pcol->pg_first = -1;
EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n",
pcol->inode->i_ino, pcol->expected_pages);
/* this is probably the end of the loop but in writes
* it might not end here. don't be left with nothing
*/
if (!pcol->expected_pages)
pcol->expected_pages = 128;
}
static int pcol_try_alloc(struct page_collect *pcol)
{
int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES);
for 