From f00769ecdba3cc9c025bfea2909cd10d26580b0b Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Sun, 15 Aug 2010 23:33:57 +0900
Subject: [PATCH] --- yaml --- r: 213748 b: refs/heads/master c:
 dc3d3b810a644dfa329efaa230cd514226f8981d h: refs/heads/master v: v3

---
 [refs]                  |  2 +-
 trunk/fs/nilfs2/inode.c | 11 +++++++++++
 trunk/fs/nilfs2/namei.c |  1 +
 trunk/fs/nilfs2/nilfs.h |  4 +---
 4 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/[refs] b/[refs]
index d3e0637b88e8..bf525437e4a1 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: fd52202930b7e8db48bee5a6fc6b1f438e822a23
+refs/heads/master: dc3d3b810a644dfa329efaa230cd514226f8981d
diff --git a/trunk/fs/nilfs2/inode.c b/trunk/fs/nilfs2/inode.c
index ca09e4362d66..3efef0ecfa24 100644
--- a/trunk/fs/nilfs2/inode.c
+++ b/trunk/fs/nilfs2/inode.c
@@ -764,6 +764,17 @@ int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
 	return err;
 }
 
+int nilfs_permission(struct inode *inode, int mask)
+{
+	struct nilfs_root *root = NILFS_I(inode)->i_root;
+
+	if ((mask & MAY_WRITE) && root &&
+	    root->cno != NILFS_CPTREE_CURRENT_CNO)
+		return -EROFS; /* snapshot is not writable */
+
+	return generic_permission(inode, mask, NULL);
+}
+
 int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
 			   struct buffer_head **pbh)
 {
diff --git a/trunk/fs/nilfs2/namei.c b/trunk/fs/nilfs2/namei.c
index a65f46560fbe..185d1607cb00 100644
--- a/trunk/fs/nilfs2/namei.c
+++ b/trunk/fs/nilfs2/namei.c
@@ -588,6 +588,7 @@ const struct inode_operations nilfs_symlink_inode_operations = {
 	.readlink	= generic_readlink,
 	.follow_link	= page_follow_link_light,
 	.put_link	= page_put_link,
+	.permission     = nilfs_permission,
 };
 
 const struct export_operations nilfs_export_ops = {
diff --git a/trunk/fs/nilfs2/nilfs.h b/trunk/fs/nilfs2/nilfs.h
index 3870c109aba3..cf5507a2a178 100644
--- a/trunk/fs/nilfs2/nilfs.h
+++ b/trunk/fs/nilfs2/nilfs.h
@@ -201,12 +201,9 @@ static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
  */
 #ifdef CONFIG_NILFS_POSIX_ACL
 #error "NILFS: not yet supported POSIX ACL"
-extern int nilfs_permission(struct inode *, int, struct nameidata *);
 extern int nilfs_acl_chmod(struct inode *);
 extern int nilfs_init_acl(struct inode *, struct inode *);
 #else
-#define nilfs_permission   NULL
-
 static inline int nilfs_acl_chmod(struct inode *inode)
 {
 	return 0;
@@ -256,6 +253,7 @@ extern void nilfs_update_inode(struct inode *, struct buffer_head *);
 extern void nilfs_truncate(struct inode *);
 extern void nilfs_evict_inode(struct inode *);
 extern int nilfs_setattr(struct dentry *, struct iattr *);
+int nilfs_permission(struct inode *inode, int mask);
 extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
 				  struct buffer_head **);
 extern int nilfs_inode_dirty(struct inode *);