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    Subject[PATCH v5 18/19] vfs: have chdir retry lookup and call once on ESTALE error
    Date
    Signed-off-by: Jeff Layton <jlayton@redhat.com>
    ---
    fs/open.c | 29 ++++++++++++++++++-----------
    1 file changed, 18 insertions(+), 11 deletions(-)

    diff --git a/fs/open.c b/fs/open.c
    index 147b232..59a7e9d 100644
    --- a/fs/open.c
    +++ b/fs/open.c
    @@ -401,20 +401,27 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
    {
    struct path path;
    int error;
    + int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
    + unsigned int try = 0;
    + char *name;

    - 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;
    + name = getname_flags(filename, lookup_flags, NULL);
    + if (IS_ERR(name))
    + return PTR_ERR(name);

    - set_fs_pwd(current->fs, &path);
    + do {
    + error = kern_path_at(AT_FDCWD, name, 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++));
    + putname(name);
    return error;
    }

    --
    1.7.11.2


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