Commit 2c22b337 authored by Jan Kara's avatar Jan Kara Committed by Al Viro
Browse files

nilfs2: Convert to new freezing mechanism 



We change nilfs_page_mkwrite() to provide proper freeze protection for
writeable page faults (we must wait for frozen filesystem even if the
page is fully mapped).

We remove all vfs_check_frozen() checks since they are now handled by
the generic code.

CC: linux-nilfs@vger.kernel.org
CC: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent fbf8fb76

fs/nilfs2/file.c

+11 −7
Original line number Diff line number Diff line
@@ -69,16 +69,18 @@ static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 
	struct page *page = vmf->page;

	struct inode *inode = vma->vm_file->f_dentry->d_inode;

	struct nilfs_transaction_info ti;

	int ret;

	int ret = 0;



	if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))

		return VM_FAULT_SIGBUS; /* -ENOSPC */



	sb_start_pagefault(inode->i_sb);

	lock_page(page);

	if (page->mapping != inode->i_mapping ||

	    page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {

		unlock_page(page);

		return VM_FAULT_NOPAGE; /* make the VM retry the fault */

		ret = -EFAULT;	/* make the VM retry the fault */

		goto out;

	}



	/*
@@ -112,19 +114,21 @@ static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 
	ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);

	/* never returns -ENOMEM, but may return -ENOSPC */

	if (unlikely(ret))

		return VM_FAULT_SIGBUS;

		goto out;



	ret = block_page_mkwrite(vma, vmf, nilfs_get_block);

	if (ret != VM_FAULT_LOCKED) {

	ret = __block_page_mkwrite(vma, vmf, nilfs_get_block);

	if (ret) {

		nilfs_transaction_abort(inode->i_sb);

		return ret;

		goto out;

	}

	nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));

	nilfs_transaction_commit(inode->i_sb);



 mapped:

	wait_on_page_writeback(page);

	return VM_FAULT_LOCKED;

 out:

	sb_end_pagefault(inode->i_sb);

	return block_page_mkwrite_return(ret);

}



static const struct vm_operations_struct nilfs_file_vm_ops = {

fs/nilfs2/ioctl.c

+0 −2
Original line number Diff line number Diff line
@@ -660,8 +660,6 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, 
		goto out_free;

	}



	vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);



	ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);

	if (ret < 0)

		printk(KERN_ERR "NILFS: GC failed during preparation: "

fs/nilfs2/segment.c

+4 −1
Original line number Diff line number Diff line
@@ -189,7 +189,7 @@ int nilfs_transaction_begin(struct super_block *sb, 
	if (ret > 0)

		return 0;



	vfs_check_frozen(sb, SB_FREEZE_WRITE);

	sb_start_intwrite(sb);



	nilfs = sb->s_fs_info;

	down_read(&nilfs->ns_segctor_sem);
@@ -205,6 +205,7 @@ int nilfs_transaction_begin(struct super_block *sb, 
	current->journal_info = ti->ti_save;

	if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)

		kmem_cache_free(nilfs_transaction_cachep, ti);

	sb_end_intwrite(sb);

	return ret;

}
@@ -246,6 +247,7 @@ int nilfs_transaction_commit(struct super_block *sb) 
		err = nilfs_construct_segment(sb);

	if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)

		kmem_cache_free(nilfs_transaction_cachep, ti);

	sb_end_intwrite(sb);

	return err;

}
@@ -264,6 +266,7 @@ void nilfs_transaction_abort(struct super_block *sb) 
	current->journal_info = ti->ti_save;

	if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)

		kmem_cache_free(nilfs_transaction_cachep, ti);

	sb_end_intwrite(sb);

}



void nilfs_relax_pressure_in_lock(struct super_block *sb)

CRA Git | Maintained and supported by SUSTech CRA and CCSE