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Subject[PATCH 16/19] nilfs2: Convert to new freezing mechanism
Date
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: Jan Kara <jack@suse.cz>
---
fs/nilfs2/file.c | 18 +++++++++++-------
fs/nilfs2/ioctl.c | 2 --
fs/nilfs2/segment.c | 2 --
3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index 2660152..0cdd702 100644
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -65,16 +65,18 @@ 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;
}

/*
@@ -108,19 +110,21 @@ 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 = {
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 2a70fce..a2063c7 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -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: "
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 0e72ad6..0891cef 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -189,8 +189,6 @@ int nilfs_transaction_begin(struct super_block *sb,
if (ret > 0)
return 0;

- vfs_check_frozen(sb, SB_FREEZE_WRITE);
-
nilfs = sb->s_fs_info;
down_read(&nilfs->ns_segctor_sem);
if (vacancy_check && nilfs_near_disk_full(nilfs)) {
--
1.7.1


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