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From: Vyacheslav Yurkov <uvv.mail@gmail.com>
To: Miklos Szeredi <miklos@szeredi.hu>, Amir Goldstein <amir73il@gmail.com>
Cc: linux-unionfs@vger.kernel.org,
	Vyacheslav Yurkov <Vyacheslav.Yurkov@bruker.com>
Subject: [PATCH v3 2/3] ovl: add ovl_allow_offline_changes() helper
Date: Thu, 27 May 2021 19:45:46 +0200	[thread overview]
Message-ID: <20210527174547.109269-2-uvv.mail@gmail.com> (raw)
In-Reply-To: <20210527174547.109269-1-uvv.mail@gmail.com>

From: Vyacheslav Yurkov <Vyacheslav.Yurkov@bruker.com>

Allows to check whether any of extended features are enabled

Signed-off-by: Vyacheslav Yurkov <Vyacheslav.Yurkov@bruker.com>
---
 fs/overlayfs/overlayfs.h | 12 ++++++++++++
 fs/overlayfs/super.c     |  4 +---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 6ec73db4bf9e..29d71f253db4 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -262,6 +262,18 @@ static inline bool ovl_open_flags_need_copy_up(int flags)
 	return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
 }
 
+static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
+{
+	/*
+	 * To avoid regressions in existing setups with overlay lower offline
+	 * changes, we allow lower changes only if none of the new features
+	 * are used.
+	 */
+	return (!ofs->config.index && !ofs->config.metacopy &&
+		!ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON);
+}
+
+
 /* util.c */
 int ovl_want_write(struct dentry *dentry);
 void ovl_drop_write(struct dentry *dentry);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 97ea35fdd933..178daa5e82c9 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1599,9 +1599,7 @@ static bool ovl_lower_uuid_ok(struct ovl_fs *ofs, const uuid_t *uuid)
 	 * user opted-in to one of the new features that require following the
 	 * lower inode of non-dir upper.
 	 */
-	if (!ofs->config.index && !ofs->config.metacopy &&
-	    !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON &&
-	    uuid_is_null(uuid))
+	if (ovl_allow_offline_changes(ofs) && uuid_is_null(uuid))
 		return false;
 
 	for (i = 0; i < ofs->numfs; i++) {
-- 
2.25.1


  reply	other threads:[~2021-05-27 17:46 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27 17:45 [PATCH v3 1/3] ovl: disable decoding null uuid with redirect dir Vyacheslav Yurkov
2021-05-27 17:45 ` Vyacheslav Yurkov [this message]
2021-05-27 17:45 ` [PATCH v3 3/3] ovl: do not set overlay.opaque for new directories Vyacheslav Yurkov
2021-05-28 11:38   ` Amir Goldstein
2021-06-01  6:53     ` Yurkov, Vyacheslav
2021-06-01  8:33       ` Amir Goldstein
2021-06-01 16:29         ` Yurkov, Vyacheslav
2021-06-01 18:29           ` Amir Goldstein
2021-06-04 12:32             ` Amir Goldstein
2021-06-04 14:50               ` Yurkov, Vyacheslav
2021-06-04 19:18                 ` Amir Goldstein
2021-07-19 14:29   ` Miklos Szeredi

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