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From: Amir Goldstein <amir73il@gmail.com>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: Jeff Layton <jlayton@poochiereds.net>,
	"J . Bruce Fields" <bfields@fieldses.org>,
	linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH v2 16/17] ovl: wire up NFS export support
Date: Thu,  4 Jan 2018 19:20:48 +0200	[thread overview]
Message-ID: <1515086449-26563-17-git-send-email-amir73il@gmail.com> (raw)
In-Reply-To: <1515086449-26563-1-git-send-email-amir73il@gmail.com>

Enable NFS export support if the "verify" feature is enabled.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/overlayfs/Kconfig | 2 ++
 fs/overlayfs/super.c | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/fs/overlayfs/Kconfig b/fs/overlayfs/Kconfig
index 0e4764ed4e23..c63473677c95 100644
--- a/fs/overlayfs/Kconfig
+++ b/fs/overlayfs/Kconfig
@@ -67,6 +67,8 @@ config OVERLAY_FS_VERIFY
 
 	  The verify feature prevents multiple redirects to the same lower dir
 	  and prevents broken hardlinks from using the same inode number.
+	  The verify feature is required for exporting an overlay filesystem
+	  subtree as an NFS share.
 
 	  Note, that verify feature is not backward compatible.  That is,
 	  mounting an overlay with verification index entries on a kernel
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 1bc37bc23e89..28596d0a53d2 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1316,6 +1316,14 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
 		ofs->config.verify = false;
 	}
 
+	/*
+	 * NFS export requires that all layers support file handles and that
+	 * all files and dirs are indexed on copy up (verify=on). We already
+	 * check that all layers support file handles for enabling index.
+	 */
+	if (ofs->config.verify)
+		sb->s_export_op = &ovl_export_operations;
+
 	/* Never override disk quota limits or use reserved space */
 	cap_lower(cred->cap_effective, CAP_SYS_RESOURCE);
 
-- 
2.7.4

  parent reply	other threads:[~2018-01-04 17:20 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-04 17:20 [PATCH v2 00/17] Overlayfs " Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 01/17] ovl: document NFS export Amir Goldstein
2018-01-11 16:06   ` Miklos Szeredi
2018-01-11 16:26     ` Amir Goldstein
2018-01-12 15:43       ` Miklos Szeredi
2018-01-12 15:49         ` Miklos Szeredi
2018-01-12 18:50           ` Amir Goldstein
2018-01-13  8:54           ` Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 02/17] ovl: encode pure upper file handles Amir Goldstein
2018-01-18 10:31   ` Miklos Szeredi
2018-01-04 17:20 ` [PATCH v2 03/17] ovl: decode " Amir Goldstein
2018-01-18 14:09   ` Miklos Szeredi
2018-01-18 14:34     ` Amir Goldstein
2018-01-18 14:39       ` Miklos Szeredi
2018-01-18 19:49         ` Amir Goldstein
2018-01-18 20:10           ` Miklos Szeredi
2018-01-18 20:35             ` Amir Goldstein
2018-01-18 22:57               ` Amir Goldstein
2018-01-19  0:23                 ` Amir Goldstein
2018-01-19 10:39                   ` Miklos Szeredi
2018-01-19 11:07                     ` Amir Goldstein
2018-01-19 20:10                       ` Amir Goldstein
2018-01-24 10:34                         ` Miklos Szeredi
2018-01-24 11:04                           ` Amir Goldstein
2018-01-24 11:18                             ` Amir Goldstein
2018-01-24 11:55                               ` Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 04/17] ovl: decode connected upper dir " Amir Goldstein
2018-01-05 12:33   ` Amir Goldstein
2018-01-05 15:18     ` J . Bruce Fields
2018-01-05 15:34       ` Amir Goldstein
2018-01-15 11:41     ` Miklos Szeredi
2018-01-15 11:33   ` Miklos Szeredi
2018-01-15 12:20     ` Amir Goldstein
2018-01-15 14:56       ` Miklos Szeredi
2018-01-17 11:18         ` Amir Goldstein
2018-01-17 12:20           ` Amir Goldstein
2018-01-17 13:29             ` Amir Goldstein
2018-01-17 15:42           ` Miklos Szeredi
2018-01-17 16:34             ` Amir Goldstein
2018-01-17 21:36               ` Amir Goldstein
2018-01-18  8:22               ` Miklos Szeredi
2018-01-18  8:47                 ` Amir Goldstein
2018-01-18  9:12                   ` Miklos Szeredi
2018-01-18 10:28                     ` Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 05/17] ovl: encode non-indexed upper " Amir Goldstein
2018-01-15 11:58   ` Miklos Szeredi
2018-01-15 12:07     ` Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 06/17] ovl: copy up before encoding dir file handle when ofs->numlower > 1 Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 07/17] ovl: encode lower file handles Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 08/17] ovl: decode lower non-dir " Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 09/17] ovl: decode indexed " Amir Goldstein
2018-01-18 13:11   ` Miklos Szeredi
2018-01-04 17:20 ` [PATCH v2 10/17] ovl: decode lower file handles of unlinked but open files Amir Goldstein
2018-01-16  9:16   ` Miklos Szeredi
2018-01-16  9:37     ` Amir Goldstein
2018-01-16 10:10       ` Miklos Szeredi
2018-01-16 10:40         ` Amir Goldstein
2018-01-16 11:07           ` Miklos Szeredi
2018-01-17 21:05         ` Amir Goldstein
2018-01-18 14:18   ` Amir Goldstein
2018-02-27 11:35     ` Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 11/17] ovl: decode indexed dir file handles Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 12/17] ovl: decode pure lower " Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 13/17] ovl: hash directory inodes for NFS export Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 14/17] ovl: lookup connected ancestor of dir in inode cache Amir Goldstein
2018-01-04 17:20 ` [PATCH v2 15/17] ovl: lookup indexed ancestor of lower dir Amir Goldstein
2018-01-04 17:20 ` Amir Goldstein [this message]
2018-01-04 17:20 ` [PATCH v2 17/17] nfsd: encode stat->mtime for getattr instead of inode->i_mtime Amir Goldstein

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