[PATCH] fs/stack.c: Copy i_nlink after all other attributes are copied

A user-specified get_nlinks may depend on other inode attributes.

Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Signed-off-by: Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/stack.c b/fs/stack.c
index 8ffb880d2f466a9f850cbe69f468fb51ad2dcaf5..67716f6a1a4a29ddb5e59dda194f837cedbfe210 100644 (file)
--- a/fs/stack.c
+++ b/fs/stack.c
@@ -20,11 +20,6 @@ EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
 void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
                                int (*get_nlinks)(struct inode *))
 {
-       if (!get_nlinks)
-               dest->i_nlink = src->i_nlink;
-       else
-               dest->i_nlink = (*get_nlinks)(dest);
-
        dest->i_mode = src->i_mode;
        dest->i_uid = src->i_uid;
        dest->i_gid = src->i_gid;
@@ -34,5 +29,14 @@ void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
        dest->i_ctime = src->i_ctime;
        dest->i_blkbits = src->i_blkbits;
        dest->i_flags = src->i_flags;
+
+       /*
+        * Update the nlinks AFTER updating the above fields, because the
+        * get_links callback may depend on them.
+        */
+       if (!get_nlinks)
+               dest->i_nlink = src->i_nlink;
+       else
+               dest->i_nlink = (*get_nlinks)(dest);
 }
 EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);