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authorZhu Yanhai <zhu.yanhai@gmail.com>2009-08-12 08:17:59 +0200
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-09-14 11:27:14 +0200
commit43be0ec0387a5ccce2e064cb78502e7b2b4dd590 (patch)
treee412246fce3f999b46b960ef416f1f10653ca895
parentnilfs2: An unassigned variable is assigned to a never used structure member (diff)
downloadlinux-43be0ec0387a5ccce2e064cb78502e7b2b4dd590.tar.xz
linux-43be0ec0387a5ccce2e064cb78502e7b2b4dd590.zip
nilfs2: add more check routines in mount process
nilfs2: Add more safeguard routines and protections in mount process, which also makes nilfs2 report consistency error messages when checkpoint number is invalid. Signed-off-by: Zhu Yanhai <zhu.yanhai@gmail.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
-rw-r--r--fs/nilfs2/cpfile.c11
-rw-r--r--fs/nilfs2/super.c7
2 files changed, 14 insertions, 4 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index aec942cf79e3..1c6cfb59128d 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -815,8 +815,10 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
void *kaddr;
int ret;
- if (cno == 0)
- return -ENOENT; /* checkpoint number 0 is invalid */
+ /* CP number is invalid if it's zero or larger than the
+ largest exist one.*/
+ if (cno == 0 || cno >= nilfs_mdt_cno(cpfile))
+ return -ENOENT;
down_read(&NILFS_MDT(cpfile)->mi_sem);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
@@ -824,7 +826,10 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
goto out;
kaddr = kmap_atomic(bh->b_page, KM_USER0);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
- ret = nilfs_checkpoint_snapshot(cp);
+ if (nilfs_checkpoint_invalid(cp))
+ ret = -ENOENT;
+ else
+ ret = nilfs_checkpoint_snapshot(cp);
kunmap_atomic(kaddr, KM_USER0);
brelse(bh);
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 019752f7d2da..50284add7880 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -792,10 +792,15 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
if (sb->s_flags & MS_RDONLY) {
if (nilfs_test_opt(sbi, SNAPSHOT)) {
+ down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
sbi->s_snapshot_cno);
- if (err < 0)
+ up_read(&nilfs->ns_segctor_sem);
+ if (err < 0) {
+ if (err == -ENOENT)
+ err = -EINVAL;
goto failed_sbi;
+ }
if (!err) {
printk(KERN_ERR
"NILFS: The specified checkpoint is "