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ovl: check on mount time if upper fs supports setting xattr

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xattr are needed by overlayfs for setting opaque dir, redirect dir
and copy up origin.

Check at mount time by trying to set the overlay.opaque xattr on the
workdir and if that fails issue a warning message.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-05-17 00:12:40 +03:00
committed by Miklos Szeredi
parent 8137ae26d2
commit 82b749b2c6
4 changed files with 38 additions and 0 deletions
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13
fs/overlayfs/super.c
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@@ -891,6 +891,19 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
dput(temp);
else
pr_warn("overlayfs: upper fs does not support tmpfile.\n");
/*
* Check if upper/work fs supports trusted.overlay.*
* xattr
*/
err = ovl_do_setxattr(ufs->workdir, OVL_XATTR_OPAQUE,
"0", 1, 0);
if (err) {
ufs->noxattr = true;
pr_warn("overlayfs: upper fs does not support xattr.\n");
} else {
vfs_removexattr(ufs->workdir, OVL_XATTR_OPAQUE);
}
}
}