From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f194.google.com ([209.85.128.194]:38786 "EHLO mail-wr0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935690AbeE2OoI (ORCPT ); Tue, 29 May 2018 10:44:08 -0400 Received: by mail-wr0-f194.google.com with SMTP id 94-v6so25970898wrf.5 for ; Tue, 29 May 2018 07:44:08 -0700 (PDT) From: Miklos Szeredi To: linux-unionfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 22/39] ovl: add ovl_fiemap() Date: Tue, 29 May 2018 16:43:22 +0200 Message-Id: <20180529144339.16538-23-mszeredi@redhat.com> In-Reply-To: <20180529144339.16538-1-mszeredi@redhat.com> References: <20180529144339.16538-1-mszeredi@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Implement stacked fiemap(). Need to split inode operations for regular file (which has fiemap) and special file (which doesn't have fiemap). Signed-off-by: Miklos Szeredi --- fs/overlayfs/inode.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index d6a13da0740f..cd46dd8e7e54 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -448,6 +448,23 @@ int ovl_update_time(struct inode *inode, struct timespec *ts, int flags) return 0; } +static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + u64 start, u64 len) +{ + int err; + struct inode *realinode = ovl_inode_real(inode); + const struct cred *old_cred; + + if (!realinode->i_op->fiemap) + return -EOPNOTSUPP; + + old_cred = ovl_override_creds(inode->i_sb); + err = realinode->i_op->fiemap(realinode, fieinfo, start, len); + revert_creds(old_cred); + + return err; +} + static const struct inode_operations ovl_file_inode_operations = { .setattr = ovl_setattr, .permission = ovl_permission, @@ -455,6 +472,7 @@ static const struct inode_operations ovl_file_inode_operations = { .listxattr = ovl_listxattr, .get_acl = ovl_get_acl, .update_time = ovl_update_time, + .fiemap = ovl_fiemap, }; static const struct inode_operations ovl_symlink_inode_operations = { @@ -465,6 +483,15 @@ static const struct inode_operations ovl_symlink_inode_operations = { .update_time = ovl_update_time, }; +static const struct inode_operations ovl_special_inode_operations = { + .setattr = ovl_setattr, + .permission = ovl_permission, + .getattr = ovl_getattr, + .listxattr = ovl_listxattr, + .get_acl = ovl_get_acl, + .update_time = ovl_update_time, +}; + /* * It is possible to stack overlayfs instance on top of another * overlayfs instance as lower layer. We need to annonate the @@ -548,7 +575,7 @@ static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev, break; default: - inode->i_op = &ovl_file_inode_operations; + inode->i_op = &ovl_special_inode_operations; init_special_inode(inode, mode, rdev); break; } -- 2.14.3