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authorMiklos Szeredi <mszeredi@redhat.com>2018-11-01 23:31:39 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2018-11-01 23:31:39 +0300
commitd47748e5ae5af6572e520cc9767bbe70c22ea498 (patch)
treeae33bdfffaaa6c1e9297d33f39dff2ddee4ddb24 /Documentation/filesystems
parent5e1275808630ea3b2c97c776f40e475017535f72 (diff)
downloadlinux-d47748e5ae5af6572e520cc9767bbe70c22ea498.tar.xz
ovl: automatically enable redirect_dir on metacopy=on
Current behavior is to automatically disable metacopy if redirect_dir is not enabled and proceed with the mount. If "metacopy=on" mount option was given, then this behavior can confuse the user: no mount failure, yet metacopy is disabled. This patch makes metacopy=on imply redirect_dir=on. The converse is also true: turning off full redirect with redirect_dir= {off|follow|nofollow} will disable metacopy. If both metacopy=on and redirect_dir={off|follow|nofollow} is specified, then mount will fail, since there's no way to correctly resolve the conflict. Reported-by: Daniel Walsh <dwalsh@redhat.com> Fixes: d5791044d2e5 ("ovl: Provide a mount option metacopy=on/off...") Cc: <stable@vger.kernel.org> # v4.19 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/overlayfs.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt
index 51c136c821bf..eef7d9d259e8 100644
--- a/Documentation/filesystems/overlayfs.txt
+++ b/Documentation/filesystems/overlayfs.txt
@@ -286,6 +286,12 @@ pointed by REDIRECT. This should not be possible on local system as setting
"trusted." xattrs will require CAP_SYS_ADMIN. But it should be possible
for untrusted layers like from a pen drive.
+Note: redirect_dir={off|nofollow|follow(*)} conflicts with metacopy=on, and
+results in an error.
+
+(*) redirect_dir=follow only conflicts with metacopy=on if upperdir=... is
+given.
+
Sharing and copying layers
--------------------------