Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2: (21 commits)
  fs/Kconfig: move nilfs2 outside misc filesystems
  nilfs2: convert nilfs_bmap_lookup to an inline function
  nilfs2: allow btree code to directly call dat operations
  nilfs2: add update functions of virtual block address to dat
  nilfs2: remove individual gfp constants for each metadata file
  nilfs2: stop zero-fill of btree path just before free it
  nilfs2: remove unused btree argument from btree functions
  nilfs2: remove nilfs_dat_abort_start and nilfs_dat_abort_free
  nilfs2: shorten freeze period due to GC in write operation v3
  nilfs2: add more check routines in mount process
  nilfs2: An unassigned variable is assigned to a never used structure member
  nilfs2: use GFP_NOIO for bio_alloc instead of GFP_NOWAIT
  nilfs2: stop using periodic write_super callback
  nilfs2: clean up nilfs_write_super
  nilfs2: fix disorder of nilfs_write_super in nilfs_sync_fs
  nilfs2: remove redundant super block commit
  nilfs2: implement nilfs_show_options to display mount options in /proc/mounts
  nilfs2: always lookup disk block address before reading metadata block
  nilfs2: use semaphore to protect pointer to a writable FS-instance
  nilfs2: fix format string compile warning (ino_t)
  ...

1 files changed, 8 insertions, 3 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);