Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-yx0-f174.google.com ([209.85.213.174]:46821 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932763Ab2F2S6a (ORCPT ); Fri, 29 Jun 2012 14:58:30 -0400 Received: by mail-yx0-f174.google.com with SMTP id l2so3038060yen.19 for ; Fri, 29 Jun 2012 11:58:30 -0700 (PDT) From: Jeff Layton To: viro@ZenIV.linux.org.uk Cc: linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, michael.brantley@deshaw.com, hch@infradead.org, miklos@szeredi.hu, pstaubach@exagrid.com Subject: [PATCH v3 16/17] vfs: have do_sys_truncate retry once on an ESTALE error Date: Fri, 29 Jun 2012 14:57:59 -0400 Message-Id: <1340996280-27123-17-git-send-email-jlayton@redhat.com> In-Reply-To: <1340996280-27123-1-git-send-email-jlayton@redhat.com> References: <1340996280-27123-1-git-send-email-jlayton@redhat.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Signed-off-by: Jeff Layton --- fs/open.c | 92 +++++++++++++++++++++++++++++++++--------------------------- 1 files changed, 51 insertions(+), 41 deletions(-) diff --git a/fs/open.c b/fs/open.c index 5af0872..e813d90 100644 --- a/fs/open.c +++ b/fs/open.c @@ -66,62 +66,72 @@ static long do_sys_truncate(const char __user *pathname, loff_t length) struct path path; struct inode *inode; int error; + unsigned int lookup_flags = LOOKUP_FOLLOW; + unsigned int try = 0; + char *name; - error = -EINVAL; if (length < 0) /* sorry, but loff_t says... */ - goto out; + return -EINVAL; - error = user_path(pathname, &path); - if (error) - goto out; - inode = path.dentry->d_inode; + name = getname_flags(pathname, lookup_flags, NULL); + if (IS_ERR(name)) + return PTR_ERR(name); - /* For directories it's -EISDIR, for other non-regulars - -EINVAL */ - error = -EISDIR; - if (S_ISDIR(inode->i_mode)) - goto dput_and_out; + do { + error = kern_path_at(AT_FDCWD, name, lookup_flags, &path); + if (error) + break; + inode = path.dentry->d_inode; - error = -EINVAL; - if (!S_ISREG(inode->i_mode)) - goto dput_and_out; + /* For dirs, -EISDIR. For other non-regulars, -EINVAL */ + error = -EISDIR; + if (S_ISDIR(inode->i_mode)) + goto dput_and_out; - error = mnt_want_write(path.mnt); - if (error) - goto dput_and_out; + error = -EINVAL; + if (!S_ISREG(inode->i_mode)) + goto dput_and_out; - error = inode_permission(inode, MAY_WRITE); - if (error) - goto mnt_drop_write_and_out; + error = mnt_want_write(path.mnt); + if (error) + goto dput_and_out; - error = -EPERM; - if (IS_APPEND(inode)) - goto mnt_drop_write_and_out; + error = inode_permission(inode, MAY_WRITE); + if (error) + goto mnt_drop_write_and_out; - error = get_write_access(inode); - if (error) - goto mnt_drop_write_and_out; + error = -EPERM; + if (IS_APPEND(inode)) + goto mnt_drop_write_and_out; - /* - * Make sure that there are no leases. get_write_access() protects - * against the truncate racing with a lease-granting setlease(). - */ - error = break_lease(inode, O_WRONLY); - if (error) - goto put_write_and_out; + error = get_write_access(inode); + if (error) + goto mnt_drop_write_and_out; - error = locks_verify_truncate(inode, NULL, length); - if (!error) - error = security_path_truncate(&path); - if (!error) - error = do_truncate(path.dentry, length, 0, NULL); + /* + * Make sure that there are no leases. get_write_access() + * protects against the truncate racing with a lease-granting + * setlease(). + */ + error = break_lease(inode, O_WRONLY); + if (error) + goto put_write_and_out; + + error = locks_verify_truncate(inode, NULL, length); + if (!error) + error = security_path_truncate(&path); + if (!error) + error = do_truncate(path.dentry, length, 0, NULL); put_write_and_out: - put_write_access(inode); + put_write_access(inode); mnt_drop_write_and_out: - mnt_drop_write(path.mnt); + mnt_drop_write(path.mnt); dput_and_out: - path_put(&path); -out: + path_put(&path); + lookup_flags |= LOOKUP_REVAL; + } while (retry_estale(error, try++)); + putname(name); return error; } -- 1.7.7.6