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Commit d6212a5f authored by Changman Lee's avatar Changman Lee Committed by Jaegeuk Kim
Browse files

f2fs: add un/freeze_fs into super_operations 



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: default avatarChangman Lee <cm224.lee@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent a2617dc6

fs/f2fs/gc.c

+5 −0
Original line number Diff line number Diff line
@@ -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))

fs/f2fs/inode.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

}

fs/f2fs/super.c

+18 −0
Original line number Diff line number Diff line
@@ -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,

};