Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 965 deletions

diff --git a/ANDROID_3.4.5/fs/nilfs2/cpfile.c b/ANDROID_3.4.5/fs/nilfs2/cpfile.c
deleted file mode 100644
index dab5c4c6..00000000
--- a/ANDROID_3.4.5/fs/nilfs2/cpfile.c
+++ /dev/null
@@ -1,965 +0,0 @@
-/*
- * cpfile.c - NILFS checkpoint file.
- *
- * Copyright (C) 2006-2008 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 Koji Sato <koji@osrg.net>.
- */
-
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/string.h>
-#include <linux/buffer_head.h>
-#include <linux/errno.h>
-#include <linux/nilfs2_fs.h>
-#include "mdt.h"
-#include "cpfile.h"
-
-
-static inline unsigned long
-nilfs_cpfile_checkpoints_per_block(const struct inode *cpfile)
-{
-	return NILFS_MDT(cpfile)->mi_entries_per_block;
-}
-
-/* block number from the beginning of the file */
-static unsigned long
-nilfs_cpfile_get_blkoff(const struct inode *cpfile, __u64 cno)
-{
-	__u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
-	do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
-	return (unsigned long)tcno;
-}
-
-/* offset in block */
-static unsigned long
-nilfs_cpfile_get_offset(const struct inode *cpfile, __u64 cno)
-{
-	__u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
-	return do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
-}
-
-static unsigned long
-nilfs_cpfile_checkpoints_in_block(const struct inode *cpfile,
-				  __u64 curr,
-				  __u64 max)
-{
-	return min_t(__u64,
-		     nilfs_cpfile_checkpoints_per_block(cpfile) -
-		     nilfs_cpfile_get_offset(cpfile, curr),
-		     max - curr);
-}
-
-static inline int nilfs_cpfile_is_in_first(const struct inode *cpfile,
-					   __u64 cno)
-{
-	return nilfs_cpfile_get_blkoff(cpfile, cno) == 0;
-}
-
-static unsigned int
-nilfs_cpfile_block_add_valid_checkpoints(const struct inode *cpfile,
-					 struct buffer_head *bh,
-					 void *kaddr,
-					 unsigned int n)
-{
-	struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
-	unsigned int count;
-
-	count = le32_to_cpu(cp->cp_checkpoints_count) + n;
-	cp->cp_checkpoints_count = cpu_to_le32(count);
-	return count;
-}
-
-static unsigned int
-nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile,
-					 struct buffer_head *bh,
-					 void *kaddr,
-					 unsigned int n)
-{
-	struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
-	unsigned int count;
-
-	WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
-	count = le32_to_cpu(cp->cp_checkpoints_count) - n;
-	cp->cp_checkpoints_count = cpu_to_le32(count);
-	return count;
-}
-
-static inline struct nilfs_cpfile_header *
-nilfs_cpfile_block_get_header(const struct inode *cpfile,
-			      struct buffer_head *bh,
-			      void *kaddr)
-{
-	return kaddr + bh_offset(bh);
-}
-
-static struct nilfs_checkpoint *
-nilfs_cpfile_block_get_checkpoint(const struct inode *cpfile, __u64 cno,
-				  struct buffer_head *bh,
-				  void *kaddr)
-{
-	return kaddr + bh_offset(bh) + nilfs_cpfile_get_offset(cpfile, cno) *
-		NILFS_MDT(cpfile)->mi_entry_size;
-}
-
-static void nilfs_cpfile_block_init(struct inode *cpfile,
-				    struct buffer_head *bh,
-				    void *kaddr)
-{
-	struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
-	size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
-	int n = nilfs_cpfile_checkpoints_per_block(cpfile);
-
-	while (n-- > 0) {
-		nilfs_checkpoint_set_invalid(cp);
-		cp = (void *)cp + cpsz;
-	}
-}
-
-static inline int nilfs_cpfile_get_header_block(struct inode *cpfile,
-						struct buffer_head **bhp)
-{
-	return nilfs_mdt_get_block(cpfile, 0, 0, NULL, bhp);
-}
-
-static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile,
-						    __u64 cno,
-						    int create,
-						    struct buffer_head **bhp)
-{
-	return nilfs_mdt_get_block(cpfile,
-				   nilfs_cpfile_get_blkoff(cpfile, cno),
-				   create, nilfs_cpfile_block_init, bhp);
-}
-
-static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile,
-						       __u64 cno)
-{
-	return nilfs_mdt_delete_block(cpfile,
-				      nilfs_cpfile_get_blkoff(cpfile, cno));
-}
-
-/**
- * nilfs_cpfile_get_checkpoint - get a checkpoint
- * @cpfile: inode of checkpoint file
- * @cno: checkpoint number
- * @create: create flag
- * @cpp: pointer to a checkpoint
- * @bhp: pointer to a buffer head
- *
- * Description: nilfs_cpfile_get_checkpoint() acquires the checkpoint
- * specified by @cno. A new checkpoint will be created if @cno is the current
- * checkpoint number and @create is nonzero.
- *
- * Return Value: On success, 0 is returned, and the checkpoint and the
- * buffer head of the buffer on which the checkpoint is located are stored in
- * the place pointed by @cpp and @bhp, respectively. On error, one of the
- * following negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-ENOENT - No such checkpoint.
- *
- * %-EINVAL - invalid checkpoint.
- */
-int nilfs_cpfile_get_checkpoint(struct inode *cpfile,
-				__u64 cno,
-				int create,
-				struct nilfs_checkpoint **cpp,
-				struct buffer_head **bhp)
-{
-	struct buffer_head *header_bh, *cp_bh;
-	struct nilfs_cpfile_header *header;
-	struct nilfs_checkpoint *cp;
-	void *kaddr;
-	int ret;
-
-	if (unlikely(cno < 1 || cno > nilfs_mdt_cno(cpfile) ||
-		     (cno < nilfs_mdt_cno(cpfile) && create)))
-		return -EINVAL;
-
-	down_write(&NILFS_MDT(cpfile)->mi_sem);
-
-	ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
-	if (ret < 0)
-		goto out_sem;
-	ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, create, &cp_bh);
-	if (ret < 0)
-		goto out_header;
-	kaddr = kmap(cp_bh->b_page);
-	cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
-	if (nilfs_checkpoint_invalid(cp)) {
-		if (!create) {
-			kunmap(cp_bh->b_page);
-			brelse(cp_bh);
-			ret = -ENOENT;
-			goto out_header;
-		}
-		/* a newly-created checkpoint */
-		nilfs_checkpoint_clear_invalid(cp);
-		if (!nilfs_cpfile_is_in_first(cpfile, cno))
-			nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh,
-								 kaddr, 1);
-		mark_buffer_dirty(cp_bh);
-
-		kaddr = kmap_atomic(header_bh->b_page);
-		header = nilfs_cpfile_block_get_header(cpfile, header_bh,
-						       kaddr);
-		le64_add_cpu(&header->ch_ncheckpoints, 1);
-		kunmap_atomic(kaddr);
-		mark_buffer_dirty(header_bh);
-		nilfs_mdt_mark_dirty(cpfile);
-	}
-
-	if (cpp != NULL)
-		*cpp = cp;
-	*bhp = cp_bh;
-
- out_header:
-	brelse(header_bh);
-
- out_sem:
-	up_write(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-/**
- * nilfs_cpfile_put_checkpoint - put a checkpoint
- * @cpfile: inode of checkpoint file
- * @cno: checkpoint number
- * @bh: buffer head
- *
- * Description: nilfs_cpfile_put_checkpoint() releases the checkpoint
- * specified by @cno. @bh must be the buffer head which has been returned by
- * a previous call to nilfs_cpfile_get_checkpoint() with @cno.
- */
-void nilfs_cpfile_put_checkpoint(struct inode *cpfile, __u64 cno,
-				 struct buffer_head *bh)
-{
-	kunmap(bh->b_page);
-	brelse(bh);
-}
-
-/**
- * nilfs_cpfile_delete_checkpoints - delete checkpoints
- * @cpfile: inode of checkpoint file
- * @start: start checkpoint number
- * @end: end checkpoint numer
- *
- * Description: nilfs_cpfile_delete_checkpoints() deletes the checkpoints in
- * the period from @start to @end, excluding @end itself. The checkpoints
- * which have been already deleted are ignored.
- *
- * Return Value: On success, 0 is returned. On error, one of the following
- * negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-EINVAL - invalid checkpoints.
- */
-int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
-				    __u64 start,
-				    __u64 end)
-{
-	struct buffer_head *header_bh, *cp_bh;
-	struct nilfs_cpfile_header *header;
-	struct nilfs_checkpoint *cp;
-	size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
-	__u64 cno;
-	void *kaddr;
-	unsigned long tnicps;
-	int ret, ncps, nicps, count, i;
-
-	if (unlikely(start == 0 || start > end)) {
-		printk(KERN_ERR "%s: invalid range of checkpoint numbers: "
-		       "[%llu, %llu)\n", __func__,
-		       (unsigned long long)start, (unsigned long long)end);
-		return -EINVAL;
-	}
-
-	down_write(&NILFS_MDT(cpfile)->mi_sem);
-
-	ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
-	if (ret < 0)
-		goto out_sem;
-	tnicps = 0;
-
-	for (cno = start; cno < end; cno += ncps) {
-		ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, end);
-		ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
-		if (ret < 0) {
-			if (ret != -ENOENT)
-				break;
-			/* skip hole */
-			ret = 0;
-			continue;
-		}
-
-		kaddr = kmap_atomic(cp_bh->b_page);
-		cp = nilfs_cpfile_block_get_checkpoint(
-			cpfile, cno, cp_bh, kaddr);
-		nicps = 0;
-		for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) {
-			WARN_ON(nilfs_checkpoint_snapshot(cp));
-			if (!nilfs_checkpoint_invalid(cp)) {
-				nilfs_checkpoint_set_invalid(cp);
-				nicps++;
-			}
-		}
-		if (nicps > 0) {
-			tnicps += nicps;
-			mark_buffer_dirty(cp_bh);
-			nilfs_mdt_mark_dirty(cpfile);
-			if (!nilfs_cpfile_is_in_first(cpfile, cno)) {
-				count =
-				  nilfs_cpfile_block_sub_valid_checkpoints(
-						cpfile, cp_bh, kaddr, nicps);
-				if (count == 0) {
-					/* make hole */
-					kunmap_atomic(kaddr);
-					brelse(cp_bh);
-					ret =
-					  nilfs_cpfile_delete_checkpoint_block(
-								   cpfile, cno);
-					if (ret == 0)
-						continue;
-					printk(KERN_ERR
-					       "%s: cannot delete block\n",
-					       __func__);
-					break;
-				}
-			}
-		}
-
-		kunmap_atomic(kaddr);
-		brelse(cp_bh);
-	}
-
-	if (tnicps > 0) {
-		kaddr = kmap_atomic(header_bh->b_page);
-		header = nilfs_cpfile_block_get_header(cpfile, header_bh,
-						       kaddr);
-		le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps);
-		mark_buffer_dirty(header_bh);
-		nilfs_mdt_mark_dirty(cpfile);
-		kunmap_atomic(kaddr);
-	}
-
-	brelse(header_bh);
-
- out_sem:
-	up_write(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-static void nilfs_cpfile_checkpoint_to_cpinfo(struct inode *cpfile,
-					      struct nilfs_checkpoint *cp,
-					      struct nilfs_cpinfo *ci)
-{
-	ci->ci_flags = le32_to_cpu(cp->cp_flags);
-	ci->ci_cno = le64_to_cpu(cp->cp_cno);
-	ci->ci_create = le64_to_cpu(cp->cp_create);
-	ci->ci_nblk_inc = le64_to_cpu(cp->cp_nblk_inc);
-	ci->ci_inodes_count = le64_to_cpu(cp->cp_inodes_count);
-	ci->ci_blocks_count = le64_to_cpu(cp->cp_blocks_count);
-	ci->ci_next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
-}
-
-static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
-					  void *buf, unsigned cisz, size_t nci)
-{
-	struct nilfs_checkpoint *cp;
-	struct nilfs_cpinfo *ci = buf;
-	struct buffer_head *bh;
-	size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
-	__u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop;
-	void *kaddr;
-	int n, ret;
-	int ncps, i;
-
-	if (cno == 0)
-		return -ENOENT; /* checkpoint number 0 is invalid */
-	down_read(&NILFS_MDT(cpfile)->mi_sem);
-
-	for (n = 0; cno < cur_cno && n < nci; cno += ncps) {
-		ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno);
-		ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
-		if (ret < 0) {
-			if (ret != -ENOENT)
-				goto out;
-			continue; /* skip hole */
-		}
-
-		kaddr = kmap_atomic(bh->b_page);
-		cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
-		for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) {
-			if (!nilfs_checkpoint_invalid(cp)) {
-				nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp,
-								  ci);
-				ci = (void *)ci + cisz;
-				n++;
-			}
-		}
-		kunmap_atomic(kaddr);
-		brelse(bh);
-	}
-
-	ret = n;
-	if (n > 0) {
-		ci = (void *)ci - cisz;
-		*cnop = ci->ci_cno + 1;
-	}
-
- out:
-	up_read(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
-					  void *buf, unsigned cisz, size_t nci)
-{
-	struct buffer_head *bh;
-	struct nilfs_cpfile_header *header;
-	struct nilfs_checkpoint *cp;
-	struct nilfs_cpinfo *ci = buf;
-	__u64 curr = *cnop, next;
-	unsigned long curr_blkoff, next_blkoff;
-	void *kaddr;
-	int n = 0, ret;
-
-	down_read(&NILFS_MDT(cpfile)->mi_sem);
-
-	if (curr == 0) {
-		ret = nilfs_cpfile_get_header_block(cpfile, &bh);
-		if (ret < 0)
-			goto out;
-		kaddr = kmap_atomic(bh->b_page);
-		header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
-		curr = le64_to_cpu(header->ch_snapshot_list.ssl_next);
-		kunmap_atomic(kaddr);
-		brelse(bh);
-		if (curr == 0) {
-			ret = 0;
-			goto out;
-		}
-	} else if (unlikely(curr == ~(__u64)0)) {
-		ret = 0;
-		goto out;
-	}
-
-	curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr);
-	ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh);
-	if (unlikely(ret < 0)) {
-		if (ret == -ENOENT)
-			ret = 0; /* No snapshots (started from a hole block) */
-		goto out;
-	}
-	kaddr = kmap_atomic(bh->b_page);
-	while (n < nci) {
-		cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr);
-		curr = ~(__u64)0; /* Terminator */
-		if (unlikely(nilfs_checkpoint_invalid(cp) ||
-			     !nilfs_checkpoint_snapshot(cp)))
-			break;
-		nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, ci);
-		ci = (void *)ci + cisz;
-		n++;
-		next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
-		if (next == 0)
-			break; /* reach end of the snapshot list */
-
-		next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
-		if (curr_blkoff != next_blkoff) {
-			kunmap_atomic(kaddr);
-			brelse(bh);
-			ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
-								0, &bh);
-			if (unlikely(ret < 0)) {
-				WARN_ON(ret == -ENOENT);
-				goto out;
-			}
-			kaddr = kmap_atomic(bh->b_page);
-		}
-		curr = next;
-		curr_blkoff = next_blkoff;
-	}
-	kunmap_atomic(kaddr);
-	brelse(bh);
-	*cnop = curr;
-	ret = n;
-
- out:
-	up_read(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-/**
- * nilfs_cpfile_get_cpinfo -
- * @cpfile:
- * @cno:
- * @ci:
- * @nci:
- */
-
-ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode,
-				void *buf, unsigned cisz, size_t nci)
-{
-	switch (mode) {
-	case NILFS_CHECKPOINT:
-		return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, buf, cisz, nci);
-	case NILFS_SNAPSHOT:
-		return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, buf, cisz, nci);
-	default:
-		return -EINVAL;
-	}
-}
-
-/**
- * nilfs_cpfile_delete_checkpoint -
- * @cpfile:
- * @cno:
- */
-int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
-{
-	struct nilfs_cpinfo ci;
-	__u64 tcno = cno;
-	ssize_t nci;
-
-	nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1);
-	if (nci < 0)
-		return nci;
-	else if (nci == 0 || ci.ci_cno != cno)
-		return -ENOENT;
-	else if (nilfs_cpinfo_snapshot(&ci))
-		return -EBUSY;
-
-	return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1);
-}
-
-static struct nilfs_snapshot_list *
-nilfs_cpfile_block_get_snapshot_list(const struct inode *cpfile,
-				     __u64 cno,
-				     struct buffer_head *bh,
-				     void *kaddr)
-{
-	struct nilfs_cpfile_header *header;
-	struct nilfs_checkpoint *cp;
-	struct nilfs_snapshot_list *list;
-
-	if (cno != 0) {
-		cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
-		list = &cp->cp_snapshot_list;
-	} else {
-		header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
-		list = &header->ch_snapshot_list;
-	}
-	return list;
-}
-
-static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
-{
-	struct buffer_head *header_bh, *curr_bh, *prev_bh, *cp_bh;
-	struct nilfs_cpfile_header *header;
-	struct nilfs_checkpoint *cp;
-	struct nilfs_snapshot_list *list;
-	__u64 curr, prev;
-	unsigned long curr_blkoff, prev_blkoff;
-	void *kaddr;
-	int ret;
-
-	if (cno == 0)
-		return -ENOENT; /* checkpoint number 0 is invalid */
-	down_write(&NILFS_MDT(cpfile)->mi_sem);
-
-	ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
-	if (ret < 0)
-		goto out_sem;
-	kaddr = kmap_atomic(cp_bh->b_page);
-	cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
-	if (nilfs_checkpoint_invalid(cp)) {
-		ret = -ENOENT;
-		kunmap_atomic(kaddr);
-		goto out_cp;
-	}
-	if (nilfs_checkpoint_snapshot(cp)) {
-		ret = 0;
-		kunmap_atomic(kaddr);
-		goto out_cp;
-	}
-	kunmap_atomic(kaddr);
-
-	ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
-	if (ret < 0)
-		goto out_cp;
-	kaddr = kmap_atomic(header_bh->b_page);
-	header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
-	list = &header->ch_snapshot_list;
-	curr_bh = header_bh;
-	get_bh(curr_bh);
-	curr = 0;
-	curr_blkoff = 0;
-	prev = le64_to_cpu(list->ssl_prev);
-	while (prev > cno) {
-		prev_blkoff = nilfs_cpfile_get_blkoff(cpfile, prev);
-		curr = prev;
-		if (curr_blkoff != prev_blkoff) {
-			kunmap_atomic(kaddr);
-			brelse(curr_bh);
-			ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr,
-								0, &curr_bh);
-			if (ret < 0)
-				goto out_header;
-			kaddr = kmap_atomic(curr_bh->b_page);
-		}
-		curr_blkoff = prev_blkoff;
-		cp = nilfs_cpfile_block_get_checkpoint(
-			cpfile, curr, curr_bh, kaddr);
-		list = &cp->cp_snapshot_list;
-		prev = le64_to_cpu(list->ssl_prev);
-	}
-	kunmap_atomic(kaddr);
-
-	if (prev != 0) {
-		ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
-							&prev_bh);
-		if (ret < 0)
-			goto out_curr;
-	} else {
-		prev_bh = header_bh;
-		get_bh(prev_bh);
-	}
-
-	kaddr = kmap_atomic(curr_bh->b_page);
-	list = nilfs_cpfile_block_get_snapshot_list(
-		cpfile, curr, curr_bh, kaddr);
-	list->ssl_prev = cpu_to_le64(cno);
-	kunmap_atomic(kaddr);
-
-	kaddr = kmap_atomic(cp_bh->b_page);
-	cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
-	cp->cp_snapshot_list.ssl_next = cpu_to_le64(curr);
-	cp->cp_snapshot_list.ssl_prev = cpu_to_le64(prev);
-	nilfs_checkpoint_set_snapshot(cp);
-	kunmap_atomic(kaddr);
-
-	kaddr = kmap_atomic(prev_bh->b_page);
-	list = nilfs_cpfile_block_get_snapshot_list(
-		cpfile, prev, prev_bh, kaddr);
-	list->ssl_next = cpu_to_le64(cno);
-	kunmap_atomic(kaddr);
-
-	kaddr = kmap_atomic(header_bh->b_page);
-	header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
-	le64_add_cpu(&header->ch_nsnapshots, 1);
-	kunmap_atomic(kaddr);
-
-	mark_buffer_dirty(prev_bh);
-	mark_buffer_dirty(curr_bh);
-	mark_buffer_dirty(cp_bh);
-	mark_buffer_dirty(header_bh);
-	nilfs_mdt_mark_dirty(cpfile);
-
-	brelse(prev_bh);
-
- out_curr:
-	brelse(curr_bh);
-
- out_header:
-	brelse(header_bh);
-
- out_cp:
-	brelse(cp_bh);
-
- out_sem:
-	up_write(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
-{
-	struct buffer_head *header_bh, *next_bh, *prev_bh, *cp_bh;
-	struct nilfs_cpfile_header *header;
-	struct nilfs_checkpoint *cp;
-	struct nilfs_snapshot_list *list;
-	__u64 next, prev;
-	void *kaddr;
-	int ret;
-
-	if (cno == 0)
-		return -ENOENT; /* checkpoint number 0 is invalid */
-	down_write(&NILFS_MDT(cpfile)->mi_sem);
-
-	ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
-	if (ret < 0)
-		goto out_sem;
-	kaddr = kmap_atomic(cp_bh->b_page);
-	cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
-	if (nilfs_checkpoint_invalid(cp)) {
-		ret = -ENOENT;
-		kunmap_atomic(kaddr);
-		goto out_cp;
-	}
-	if (!nilfs_checkpoint_snapshot(cp)) {
-		ret = 0;
-		kunmap_atomic(kaddr);
-		goto out_cp;
-	}
-
-	list = &cp->cp_snapshot_list;
-	next = le64_to_cpu(list->ssl_next);
-	prev = le64_to_cpu(list->ssl_prev);
-	kunmap_atomic(kaddr);
-
-	ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
-	if (ret < 0)
-		goto out_cp;
-	if (next != 0) {
-		ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, 0,
-							&next_bh);
-		if (ret < 0)
-			goto out_header;
-	} else {
-		next_bh = header_bh;
-		get_bh(next_bh);
-	}
-	if (prev != 0) {
-		ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
-							&prev_bh);
-		if (ret < 0)
-			goto out_next;
-	} else {
-		prev_bh = header_bh;
-		get_bh(prev_bh);
-	}
-
-	kaddr = kmap_atomic(next_bh->b_page);
-	list = nilfs_cpfile_block_get_snapshot_list(
-		cpfile, next, next_bh, kaddr);
-	list->ssl_prev = cpu_to_le64(prev);
-	kunmap_atomic(kaddr);
-
-	kaddr = kmap_atomic(prev_bh->b_page);
-	list = nilfs_cpfile_block_get_snapshot_list(
-		cpfile, prev, prev_bh, kaddr);
-	list->ssl_next = cpu_to_le64(next);
-	kunmap_atomic(kaddr);
-
-	kaddr = kmap_atomic(cp_bh->b_page);
-	cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
-	cp->cp_snapshot_list.ssl_next = cpu_to_le64(0);
-	cp->cp_snapshot_list.ssl_prev = cpu_to_le64(0);
-	nilfs_checkpoint_clear_snapshot(cp);
-	kunmap_atomic(kaddr);
-
-	kaddr = kmap_atomic(header_bh->b_page);
-	header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
-	le64_add_cpu(&header->ch_nsnapshots, -1);
-	kunmap_atomic(kaddr);
-
-	mark_buffer_dirty(next_bh);
-	mark_buffer_dirty(prev_bh);
-	mark_buffer_dirty(cp_bh);
-	mark_buffer_dirty(header_bh);
-	nilfs_mdt_mark_dirty(cpfile);
-
-	brelse(prev_bh);
-
- out_next:
-	brelse(next_bh);
-
- out_header:
-	brelse(header_bh);
-
- out_cp:
-	brelse(cp_bh);
-
- out_sem:
-	up_write(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-/**
- * nilfs_cpfile_is_snapshot -
- * @cpfile: inode of checkpoint file
- * @cno: checkpoint number
- *
- * Description:
- *
- * Return Value: On success, 1 is returned if the checkpoint specified by
- * @cno is a snapshot, or 0 if not. On error, one of the following negative
- * error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-ENOENT - No such checkpoint.
- */
-int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
-{
-	struct buffer_head *bh;
-	struct nilfs_checkpoint *cp;
-	void *kaddr;
-	int ret;
-
-	/* CP number is invalid if it's zero or larger than the
-	largest	exist one.*/
-	if (cno == 0 || cno >= nilfs_mdt_cno(cpfile))
-		return -ENOENT;
-	down_read(&NILFS_MDT(cpfile)->mi_sem);
-
-	ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
-	if (ret < 0)
-		goto out;
-	kaddr = kmap_atomic(bh->b_page);
-	cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
-	if (nilfs_checkpoint_invalid(cp))
-		ret = -ENOENT;
-	else
-		ret = nilfs_checkpoint_snapshot(cp);
-	kunmap_atomic(kaddr);
-	brelse(bh);
-
- out:
-	up_read(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-/**
- * nilfs_cpfile_change_cpmode - change checkpoint mode
- * @cpfile: inode of checkpoint file
- * @cno: checkpoint number
- * @status: mode of checkpoint
- *
- * Description: nilfs_change_cpmode() changes the mode of the checkpoint
- * specified by @cno. The mode @mode is NILFS_CHECKPOINT or NILFS_SNAPSHOT.
- *
- * Return Value: On success, 0 is returned. On error, one of the following
- * negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-ENOENT - No such checkpoint.
- */
-int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
-{
-	int ret;
-
-	switch (mode) {
-	case NILFS_CHECKPOINT:
-		if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno))
-			/*
-			 * Current implementation does not have to protect
-			 * plain read-only mounts since they are exclusive
-			 * with a read/write mount and are protected from the
-			 * cleaner.
-			 */
-			ret = -EBUSY;
-		else
-			ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
-		return ret;
-	case NILFS_SNAPSHOT:
-		return nilfs_cpfile_set_snapshot(cpfile, cno);
-	default:
-		return -EINVAL;
-	}
-}
-
-/**
- * nilfs_cpfile_get_stat - get checkpoint statistics
- * @cpfile: inode of checkpoint file
- * @stat: pointer to a structure of checkpoint statistics
- *
- * Description: nilfs_cpfile_get_stat() returns information about checkpoints.
- *
- * Return Value: On success, 0 is returned, and checkpoints information is
- * stored in the place pointed by @stat. On error, one of the following
- * negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- */
-int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
-{
-	struct buffer_head *bh;
-	struct nilfs_cpfile_header *header;
-	void *kaddr;
-	int ret;
-
-	down_read(&NILFS_MDT(cpfile)->mi_sem);
-
-	ret = nilfs_cpfile_get_header_block(cpfile, &bh);
-	if (ret < 0)
-		goto out_sem;
-	kaddr = kmap_atomic(bh->b_page);
-	header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
-	cpstat->cs_cno = nilfs_mdt_cno(cpfile);
-	cpstat->cs_ncps = le64_to_cpu(header->ch_ncheckpoints);
-	cpstat->cs_nsss = le64_to_cpu(header->ch_nsnapshots);
-	kunmap_atomic(kaddr);
-	brelse(bh);
-
- out_sem:
-	up_read(&NILFS_MDT(cpfile)->mi_sem);
-	return ret;
-}
-
-/**
- * nilfs_cpfile_read - read or get cpfile inode
- * @sb: super block instance
- * @cpsize: size of a checkpoint entry
- * @raw_inode: on-disk cpfile inode
- * @inodep: buffer to store the inode
- */
-int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
-		      struct nilfs_inode *raw_inode, struct inode **inodep)
-{
-	struct inode *cpfile;
-	int err;
-
-	cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO);
-	if (unlikely(!cpfile))
-		return -ENOMEM;
-	if (!(cpfile->i_state & I_NEW))
-		goto out;
-
-	err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0);
-	if (err)
-		goto failed;
-
-	nilfs_mdt_set_entry_size(cpfile, cpsize,
-				 sizeof(struct nilfs_cpfile_header));
-
-	err = nilfs_read_inode_common(cpfile, raw_inode);
-	if (err)
-		goto failed;
-
-	unlock_new_inode(cpfile);
- out:
-	*inodep = cpfile;
-	return 0;
- failed:
-	iget_failed(cpfile);
-	return err;
-}