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authorZhu Yanhai <zhu.yanhai@gmail.com>2009-08-12 14:17:59 +0800
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-09-14 18:27:14 +0900
commit43be0ec0387a5ccce2e064cb78502e7b2b4dd590 (patch)
treee412246fce3f999b46b960ef416f1f10653ca895 /fs/nilfs2/cpfile.c
parenta4f0b9c5b4ae83636dafde8f3a0e04b5e411a0f3 (diff)
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>
Diffstat (limited to 'fs/nilfs2/cpfile.c')
-rw-r--r--fs/nilfs2/cpfile.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index aec942cf79e..1c6cfb59128 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);