1 files changed, 0 insertions, 536 deletions

diff --git a/ANDROID_3.4.5/fs/nilfs2/segbuf.c b/ANDROID_3.4.5/fs/nilfs2/segbuf.c
deleted file mode 100644
index dc9a9137..00000000
--- a/ANDROID_3.4.5/fs/nilfs2/segbuf.c
+++ /dev/null
@@ -1,536 +0,0 @@
-/*
- * segbuf.c - NILFS segment buffer
- *
- * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
- *
- * This program 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 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
- *
- * Written by Ryusuke Konishi <ryusuke@osrg.net>
- *
- */
-
-#include <linux/buffer_head.h>
-#include <linux/writeback.h>
-#include <linux/crc32.h>
-#include <linux/backing-dev.h>
-#include <linux/slab.h>
-#include "page.h"
-#include "segbuf.h"
-
-
-struct nilfs_write_info {
-	struct the_nilfs       *nilfs;
-	struct bio	       *bio;
-	int			start, end; /* The region to be submitted */
-	int			rest_blocks;
-	int			max_pages;
-	int			nr_vecs;
-	sector_t		blocknr;
-};
-
-static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
-			      struct the_nilfs *nilfs);
-static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);
-
-struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb)
-{
-	struct nilfs_segment_buffer *segbuf;
-
-	segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS);
-	if (unlikely(!segbuf))
-		return NULL;
-
-	segbuf->sb_super = sb;
-	INIT_LIST_HEAD(&segbuf->sb_list);
-	INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);
-	INIT_LIST_HEAD(&segbuf->sb_payload_buffers);
-	segbuf->sb_super_root = NULL;
-
-	init_completion(&segbuf->sb_bio_event);
-	atomic_set(&segbuf->sb_err, 0);
-	segbuf->sb_nbio = 0;
-
-	return segbuf;
-}
-
-void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf)
-{
-	kmem_cache_free(nilfs_segbuf_cachep, segbuf);
-}
-
-void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,
-		     unsigned long offset, struct the_nilfs *nilfs)
-{
-	segbuf->sb_segnum = segnum;
-	nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start,
-				&segbuf->sb_fseg_end);
-
-	segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset;
-	segbuf->sb_rest_blocks =
-		segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
-}
-
-/**
- * nilfs_segbuf_map_cont - map a new log behind a given log
- * @segbuf: new segment buffer
- * @prev: segment buffer containing a log to be continued
- */
-void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
-			   struct nilfs_segment_buffer *prev)
-{
-	segbuf->sb_segnum = prev->sb_segnum;
-	segbuf->sb_fseg_start = prev->sb_fseg_start;
-	segbuf->sb_fseg_end = prev->sb_fseg_end;
-	segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks;
-	segbuf->sb_rest_blocks =
-		segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
-}
-
-void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,
-				  __u64 nextnum, struct the_nilfs *nilfs)
-{
-	segbuf->sb_nextnum = nextnum;
-	segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum);
-}
-
-int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf)
-{
-	struct buffer_head *bh;
-
-	bh = sb_getblk(segbuf->sb_super,
-		       segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk);
-	if (unlikely(!bh))
-		return -ENOMEM;
-
-	nilfs_segbuf_add_segsum_buffer(segbuf, bh);
-	return 0;
-}
-
-int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf,
-				struct buffer_head **bhp)
-{
-	struct buffer_head *bh;
-
-	bh = sb_getblk(segbuf->sb_super,
-		       segbuf->sb_pseg_start + segbuf->sb_sum.nblocks);
-	if (unlikely(!bh))
-		return -ENOMEM;
-
-	nilfs_segbuf_add_payload_buffer(segbuf, bh);
-	*bhp = bh;
-	return 0;
-}
-
-int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned flags,
-		       time_t ctime, __u64 cno)
-{
-	int err;
-
-	segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0;
-	err = nilfs_segbuf_extend_segsum(segbuf);
-	if (unlikely(err))
-		return err;
-
-	segbuf->sb_sum.flags = flags;
-	segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary);
-	segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0;
-	segbuf->sb_sum.ctime = ctime;
-	segbuf->sb_sum.cno = cno;
-	return 0;
-}
-
-/*
- * Setup segment summary
- */
-void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf)
-{
-	struct nilfs_segment_summary *raw_sum;
-	struct buffer_head *bh_sum;
-
-	bh_sum = list_entry(segbuf->sb_segsum_buffers.next,
-			    struct buffer_head, b_assoc_buffers);
-	raw_sum = (struct nilfs_segment_summary *)bh_sum->b_data;
-
-	raw_sum->ss_magic    = cpu_to_le32(NILFS_SEGSUM_MAGIC);
-	raw_sum->ss_bytes    = cpu_to_le16(sizeof(*raw_sum));
-	raw_sum->ss_flags    = cpu_to_le16(segbuf->sb_sum.flags);
-	raw_sum->ss_seq      = cpu_to_le64(segbuf->sb_sum.seg_seq);
-	raw_sum->ss_create   = cpu_to_le64(segbuf->sb_sum.ctime);
-	raw_sum->ss_next     = cpu_to_le64(segbuf->sb_sum.next);
-	raw_sum->ss_nblocks  = cpu_to_le32(segbuf->sb_sum.nblocks);
-	raw_sum->ss_nfinfo   = cpu_to_le32(segbuf->sb_sum.nfinfo);
-	raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes);
-	raw_sum->ss_pad      = 0;
-	raw_sum->ss_cno      = cpu_to_le64(segbuf->sb_sum.cno);
-}
-
-/*
- * CRC calculation routines
- */
-static void
-nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, u32 seed)
-{
-	struct buffer_head *bh;
-	struct nilfs_segment_summary *raw_sum;
-	unsigned long size, bytes = segbuf->sb_sum.sumbytes;
-	u32 crc;
-
-	bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,
-			b_assoc_buffers);
-
-	raw_sum = (struct nilfs_segment_summary *)bh->b_data;
-	size = min_t(unsigned long, bytes, bh->b_size);
-	crc = crc32_le(seed,
-		       (unsigned char *)raw_sum +
-		       sizeof(raw_sum->ss_datasum) + sizeof(raw_sum->ss_sumsum),
-		       size - (sizeof(raw_sum->ss_datasum) +
-			       sizeof(raw_sum->ss_sumsum)));
-
-	list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,
-				     b_assoc_buffers) {
-		bytes -= size;
-		size = min_t(unsigned long, bytes, bh->b_size);
-		crc = crc32_le(crc, bh->b_data, size);
-	}
-	raw_sum->ss_sumsum = cpu_to_le32(crc);
-}
-
-static void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf,
-					  u32 seed)
-{
-	struct buffer_head *bh;
-	struct nilfs_segment_summary *raw_sum;
-	void *kaddr;
-	u32 crc;
-
-	bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,
-			b_assoc_buffers);
-	raw_sum = (struct nilfs_segment_summary *)bh->b_data;
-	crc = crc32_le(seed,
-		       (unsigned char *)raw_sum + sizeof(raw_sum->ss_datasum),
-		       bh->b_size - sizeof(raw_sum->ss_datasum));
-
-	list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,
-				     b_assoc_buffers) {
-		crc = crc32_le(crc, bh->b_data, bh->b_size);
-	}
-	list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
-		kaddr = kmap_atomic(bh->b_page);
-		crc = crc32_le(crc, kaddr + bh_offset(bh), bh->b_size);
-		kunmap_atomic(kaddr);
-	}
-	raw_sum->ss_datasum = cpu_to_le32(crc);
-}
-
-static void
-nilfs_segbuf_fill_in_super_root_crc(struct nilfs_segment_buffer *segbuf,
-				    u32 seed)
-{
-	struct nilfs_super_root *raw_sr;
-	struct the_nilfs *nilfs = segbuf->sb_super->s_fs_info;
-	unsigned srsize;
-	u32 crc;
-
-	raw_sr = (struct nilfs_super_root *)segbuf->sb_super_root->b_data;
-	srsize = NILFS_SR_BYTES(nilfs->ns_inode_size);
-	crc = crc32_le(seed,
-		       (unsigned char *)raw_sr + sizeof(raw_sr->sr_sum),
-		       srsize - sizeof(raw_sr->sr_sum));
-	raw_sr->sr_sum = cpu_to_le32(crc);
-}
-
-static void nilfs_release_buffers(struct list_head *list)
-{
-	struct buffer_head *bh, *n;
-
-	list_for_each_entry_safe(bh, n, list, b_assoc_buffers) {
-		list_del_init(&bh->b_assoc_buffers);
-		brelse(bh);
-	}
-}
-
-static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
-{
-	nilfs_release_buffers(&segbuf->sb_segsum_buffers);
-	nilfs_release_buffers(&segbuf->sb_payload_buffers);
-	segbuf->sb_super_root = NULL;
-}
-
-/*
- * Iterators for segment buffers
- */
-void nilfs_clear_logs(struct list_head *logs)
-{
-	struct nilfs_segment_buffer *segbuf;
-
-	list_for_each_entry(segbuf, logs, sb_list)
-		nilfs_segbuf_clear(segbuf);
-}
-
-void nilfs_truncate_logs(struct list_head *logs,
-			 struct nilfs_segment_buffer *last)
-{
-	struct nilfs_segment_buffer *n, *segbuf;
-
-	segbuf = list_prepare_entry(last, logs, sb_list);
-	list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) {
-		list_del_init(&segbuf->sb_list);
-		nilfs_segbuf_clear(segbuf);
-		nilfs_segbuf_free(segbuf);
-	}
-}
-
-int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs)
-{
-	struct nilfs_segment_buffer *segbuf;
-	int ret = 0;
-
-	list_for_each_entry(segbuf, logs, sb_list) {
-		ret = nilfs_segbuf_write(segbuf, nilfs);
-		if (ret)
-			break;
-	}
-	return ret;
-}
-
-int nilfs_wait_on_logs(struct list_head *logs)
-{
-	struct nilfs_segment_buffer *segbuf;
-	int err, ret = 0;
-
-	list_for_each_entry(segbuf, logs, sb_list) {
-		err = nilfs_segbuf_wait(segbuf);
-		if (err && !ret)
-			ret = err;
-	}
-	return ret;
-}
-
-/**
- * nilfs_add_checksums_on_logs - add checksums on the logs
- * @logs: list of segment buffers storing target logs
- * @seed: checksum seed value
- */
-void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed)
-{
-	struct nilfs_segment_buffer *segbuf;
-
-	list_for_each_entry(segbuf, logs, sb_list) {
-		if (segbuf->sb_super_root)
-			nilfs_segbuf_fill_in_super_root_crc(segbuf, seed);
-		nilfs_segbuf_fill_in_segsum_crc(segbuf, seed);
-		nilfs_segbuf_fill_in_data_crc(segbuf, seed);
-	}
-}
-
-/*
- * BIO operations
- */
-static void nilfs_end_bio_write(struct bio *bio, int err)
-{
-	const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
-	struct nilfs_segment_buffer *segbuf = bio->bi_private;
-
-	if (err == -EOPNOTSUPP) {
-		set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
-		bio_put(bio);
-		/* to be detected by submit_seg_bio() */
-	}
-
-	if (!uptodate)
-		atomic_inc(&segbuf->sb_err);
-
-	bio_put(bio);
-	complete(&segbuf->sb_bio_event);
-}
-
-static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
-				   struct nilfs_write_info *wi, int mode)
-{
-	struct bio *bio = wi->bio;
-	int err;
-
-	if (segbuf->sb_nbio > 0 &&
-	    bdi_write_congested(segbuf->sb_super->s_bdi)) {
-		wait_for_completion(&segbuf->sb_bio_event);
-		segbuf->sb_nbio--;
-		if (unlikely(atomic_read(&segbuf->sb_err))) {
-			bio_put(bio);
-			err = -EIO;
-			goto failed;
-		}
-	}
-
-	bio->bi_end_io = nilfs_end_bio_write;
-	bio->bi_private = segbuf;
-	bio_get(bio);
-	submit_bio(mode, bio);
-	if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
-		bio_put(bio);
-		err = -EOPNOTSUPP;
-		goto failed;
-	}
-	segbuf->sb_nbio++;
-	bio_put(bio);
-
-	wi->bio = NULL;
-	wi->rest_blocks -= wi->end - wi->start;
-	wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
-	wi->start = wi->end;
-	return 0;
-
- failed:
-	wi->bio = NULL;
-	return err;
-}
-
-/**
- * nilfs_alloc_seg_bio - allocate a new bio for writing log
- * @nilfs: nilfs object
- * @start: start block number of the bio
- * @nr_vecs: request size of page vector.
- *
- * Return Value: On success, pointer to the struct bio is returned.
- * On error, NULL is returned.
- */
-static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start,
-				       int nr_vecs)
-{
-	struct bio *bio;
-
-	bio = bio_alloc(GFP_NOIO, nr_vecs);
-	if (bio == NULL) {
-		while (!bio && (nr_vecs >>= 1))
-			bio = bio_alloc(GFP_NOIO, nr_vecs);
-	}
-	if (likely(bio)) {
-		bio->bi_bdev = nilfs->ns_bdev;
-		bio->bi_sector = start << (nilfs->ns_blocksize_bits - 9);
-	}
-	return bio;
-}
-
-static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,
-				       struct nilfs_write_info *wi)
-{
-	wi->bio = NULL;
-	wi->rest_blocks = segbuf->sb_sum.nblocks;
-	wi->max_pages = bio_get_nr_vecs(wi->nilfs->ns_bdev);
-	wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
-	wi->start = wi->end = 0;
-	wi->blocknr = segbuf->sb_pseg_start;
-}
-
-static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf,
-				  struct nilfs_write_info *wi,
-				  struct buffer_head *bh, int mode)
-{
-	int len, err;
-
-	BUG_ON(wi->nr_vecs <= 0);
- repeat:
-	if (!wi->bio) {
-		wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end,
-					      wi->nr_vecs);
-		if (unlikely(!wi->bio))
-			return -ENOMEM;
-	}
-
-	len = bio_add_page(wi->bio, bh->b_page, bh->b_size, bh_offset(bh));
-	if (len == bh->b_size) {
-		wi->end++;
-		return 0;
-	}
-	/* bio is FULL */
-	err = nilfs_segbuf_submit_bio(segbuf, wi, mode);
-	/* never submit current bh */
-	if (likely(!err))
-		goto repeat;
-	return err;
-}
-
-/**
- * nilfs_segbuf_write - submit write requests of a log
- * @segbuf: buffer storing a log to be written
- * @nilfs: nilfs object
- *
- * Return Value: On Success, 0 is returned. On Error, one of the following
- * negative error code is returned.
- *
- * %-EIO - I/O error
- *
- * %-ENOMEM - Insufficient memory available.
- */
-static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
-			      struct the_nilfs *nilfs)
-{
-	struct nilfs_write_info wi;
-	struct buffer_head *bh;
-	int res = 0, rw = WRITE;
-
-	wi.nilfs = nilfs;
-	nilfs_segbuf_prepare_write(segbuf, &wi);
-
-	list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) {
-		res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
-		if (unlikely(res))
-			goto failed_bio;
-	}
-
-	list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
-		res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
-		if (unlikely(res))
-			goto failed_bio;
-	}
-
-	if (wi.bio) {
-		/*
-		 * Last BIO is always sent through the following
-		 * submission.
-		 */
-		rw |= REQ_SYNC;
-		res = nilfs_segbuf_submit_bio(segbuf, &wi, rw);
-	}
-
- failed_bio:
-	return res;
-}
-
-/**
- * nilfs_segbuf_wait - wait for completion of requested BIOs
- * @segbuf: segment buffer
- *
- * Return Value: On Success, 0 is returned. On Error, one of the following
- * negative error code is returned.
- *
- * %-EIO - I/O error
- */
-static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf)
-{
-	int err = 0;
-
-	if (!segbuf->sb_nbio)
-		return 0;
-
-	do {
-		wait_for_completion(&segbuf->sb_bio_event);
-	} while (--segbuf->sb_nbio > 0);
-
-	if (unlikely(atomic_read(&segbuf->sb_err) > 0)) {
-		printk(KERN_ERR "NILFS: IO error writing segment\n");
-		err = -EIO;
-	}
-	return err;
-}