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Commit 0d561f12 authored by Jiro SEKIBA's avatar Jiro SEKIBA Committed by Ryusuke Konishi
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nilfs2: add reader's lock for cno in nilfs_ioctl_sync 



This adds reader's lock for the_nilfs->cno in nilfs_ioctl_sync,
for the_nilfs->cno should be proctected by segctor_sem when reading.

Signed-off-by: default avatarJiro SEKIBA <jir@unicus.jp>
Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent 03f29365

fs/nilfs2/ioctl.c

+5 −1
Original line number Diff line number Diff line
@@ -601,13 +601,17 @@ static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, 
{

	__u64 cno;

	int ret;

	struct the_nilfs *nilfs;



	ret = nilfs_construct_segment(inode->i_sb);

	if (ret < 0)

		return ret;



	if (argp != NULL) {

		cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;

		nilfs = NILFS_SB(inode->i_sb)->s_nilfs;

		down_read(&nilfs->ns_segctor_sem);

		cno = nilfs->ns_cno - 1;

		up_read(&nilfs->ns_segctor_sem);

		if (copy_to_user(argp, &cno, sizeof(cno)))

			return -EFAULT;

	}