From 0d561f12b490dd2b993d73112d3297007688e6df Mon Sep 17 00:00:00 2001 From: Jiro SEKIBA Date: Sat, 20 Feb 2010 19:47:49 +0900 Subject: [PATCH] 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: Jiro SEKIBA Signed-off-by: Ryusuke Konishi --- fs/nilfs2/ioctl.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c index 8e5cad020c30..313d0a21da48 100644 --- a/fs/nilfs2/ioctl.c +++ b/fs/nilfs2/ioctl.c @@ -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; } -- 2.20.1