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nilfs2: add nilfs_cleanup_super 

This function write out filesystem state to super blocks in order to
share the same cleanup work.  This is a preparation for making super
block writeback alternately.

Cc: Jiro SEKIBA <jir@unicus.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-06-28 17:49:29 +09:00
parent bde4e696e4
commit 7ecaa46cfe
3 changed files with 23 additions and 11 deletions
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1
fs/nilfs2/nilfs.h
View File

@ -271,6 +271,7 @@ nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
extern int nilfs_store_magic_and_option(struct super_block *,
struct nilfs_super_block *, char *);
extern int nilfs_commit_super(struct nilfs_sb_info *, int);
extern int nilfs_cleanup_super(struct nilfs_sb_info *);
extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);

28
fs/nilfs2/super.c
View File

@ -278,6 +278,24 @@ int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb)
return nilfs_sync_super(sbi, dupsb);
}
/**
* nilfs_cleanup_super() - write filesystem state for cleanup
* @sbi: nilfs_sb_info to be unmounted or degraded to read-only
*
* This function restores state flags in the on-disk super block.
* This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
* filesystem was not clean previously.
*/
int nilfs_cleanup_super(struct nilfs_sb_info *sbi)
{
struct nilfs_super_block **sbp = sbi->s_nilfs->ns_sbp;
int ret;
sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state);
ret = nilfs_commit_super(sbi, 1);
return ret;
}
static void nilfs_put_super(struct super_block *sb)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
@ -289,8 +307,7 @@ static void nilfs_put_super(struct super_block *sb)
if (!(sb->s_flags & MS_RDONLY)) {
down_write(&nilfs->ns_sem);
nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
nilfs_commit_super(sbi, 1);
nilfs_cleanup_super(sbi);
up_write(&nilfs->ns_sem);
}
down_write(&nilfs->ns_super_sem);
@ -819,7 +836,6 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
static int nilfs_remount(struct super_block *sb, int *flags, char *data)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct nilfs_super_block *sbp;
struct the_nilfs *nilfs = sbi->s_nilfs;
unsigned long old_sb_flags;
struct nilfs_mount_options old_opts;
@ -880,11 +896,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
* the RDONLY flag and then mark the partition as valid again.
*/
down_write(&nilfs->ns_sem);
sbp = nilfs->ns_sbp[0];
if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) &&
(nilfs->ns_mount_state & NILFS_VALID_FS))
sbp->s_state = cpu_to_le16(nilfs->ns_mount_state);
nilfs_commit_super(sbi, 1);
nilfs_cleanup_super(sbi);
up_write(&nilfs->ns_sem);
} else {
/*

5
fs/nilfs2/the_nilfs.c
View File

@ -324,9 +324,8 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
goto failed_unload;
down_write(&nilfs->ns_sem);
nilfs->ns_mount_state |= NILFS_VALID_FS;
nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
err = nilfs_commit_super(sbi, 1);
nilfs->ns_mount_state |= NILFS_VALID_FS; /* set "clean" flag */
err = nilfs_cleanup_super(sbi);
up_write(&nilfs->ns_sem);
if (err) {