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f2fs: add un/freeze_fs into super_operations

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This patch supports ioctl FIFREEZE and FITHAW to snapshot filesystem.
Before calling f2fs_freeze, all writers would be suspended and sync_fs
would be completed. So no f2fs has to do something.
Just background gc operation should be skipped due to generate dirty
nodes and data until unfreeze.

Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Changman Lee 2013-01-29 18:30:07 +09:00 committed by Jaegeuk Kim
parent a2617dc686
commit d6212a5f18
3 changed files with 25 additions and 0 deletions
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5
fs/f2fs/gc.c
View file

@ -44,6 +44,11 @@ static int gc_thread_func(void *data)
if (kthread_should_stop())
break;
if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
wait_ms = GC_THREAD_MAX_SLEEP_TIME;
continue;
}
f2fs_balance_fs(sbi);
if (!test_opt(sbi, BG_GC))

2
fs/f2fs/inode.c
View file

@ -278,6 +278,7 @@ void f2fs_evict_inode(struct inode *inode)
if (inode->i_nlink || is_bad_inode(inode))
goto no_delete;
sb_start_intwrite(inode->i_sb);
set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
i_size_write(inode, 0);
@ -285,6 +286,7 @@ void f2fs_evict_inode(struct inode *inode)
f2fs_truncate(inode);
remove_inode_page(inode);
sb_end_intwrite(inode->i_sb);
no_delete:
clear_inode(inode);
}

18
fs/f2fs/super.c
View file

@ -143,6 +143,22 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
return 0;
}
static int f2fs_freeze(struct super_block *sb)
{
int err;
if (sb->s_flags & MS_RDONLY)
return 0;
err = f2fs_sync_fs(sb, 1);
return err;
}
static int f2fs_unfreeze(struct super_block *sb)
{
return 0;
}
static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
@ -213,6 +229,8 @@ static struct super_operations f2fs_sops = {
.evict_inode = f2fs_evict_inode,
.put_super = f2fs_put_super,
.sync_fs = f2fs_sync_fs,
.freeze_fs = f2fs_freeze,
.unfreeze_fs = f2fs_unfreeze,
.statfs = f2fs_statfs,
};