[PATCH v7 35/49] vfs: have chdir retry lookup and call once on ESTALE error

Jeff Layton
2012-10-02T00:17:56Z

fs/open.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index a5a5c9a..81ba325 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -389,20 +389,21 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
{
struct path path;
int error;
+ int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
+ unsigned int try = 0;

- error = user_path_dir(filename, &path);
- if (error)
- goto out;
-
- error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
- if (error)
- goto dput_and_out;
-
- set_fs_pwd(current->fs, &path);
+ do {
+ error = user_path_at(AT_FDCWD, filename, lookup_flags, &path);
+ if (error)
+ break;

-dput_and_out:
- path_put(&path);
-out:
+ error = inode_permission(path.dentry->d_inode,
+ MAY_EXEC | MAY_CHDIR);
+ if (!error)
+ set_fs_pwd(current->fs, &path);
+ path_put(&path);
+ lookup_flags |= LOOKUP_REVAL;
+ } while (retry_estale(error, try++));
return error;
}

--
1.7.11.4