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authorJiro SEKIBA <jir@unicus.jp>2010-02-20 19:47:49 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-02-20 21:18:19 +0900
commit0d561f12b490dd2b993d73112d3297007688e6df (patch)
tree3c754966cb9ec6647048ae2fd41428c9fa4b1b84 /fs/nilfs2
parent03f29365e84ff6d651be4e6186e0400ca59da6cd (diff)
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 <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2')
-rw-r--r--fs/nilfs2/ioctl.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 8e5cad020c3..313d0a21da4 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;
}