Commit 972d0093 authored Sep 19, 2017 by Amir Goldstein Committed by Miklos Szeredi Jan 24, 2018

ovl: force r/o mount when index dir creation fails



When work dir creation fails, a warning is emitted and overlay is
mounted r/o. Trying to remount r/w will fail with no work dir.

When index dir creation fails, the same warning is emitted and overlay
is mounted r/o, but trying to remount r/w will succeed. This may cause
unintentional corruption of filesystem consistency.

Adjust the behavior of index dir creation failure to that of work dir
creation failure and do not allow to remount r/w. User needs to state
an explicitly intention to work without an index by mounting with
option 'index=off' to allow r/w mount with no index dir.

When mounting with option 'index=on' and no 'upperdir', index is
implicitly disabled, so do not warn about no file handle support.

The issue was introduced with inodes index feature in v4.13, but this
patch will not apply cleanly before ovl_fill_super() re-factoring in
v4.15.

Fixes: 02bcd157 ("ovl: introduce the inodes index dir feature")
Cc: <stable@vger.kernel.org> #v4.13
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

parent a683737b

fs/overlayfs/super.c

+9 −3

Original line number	Diff line number	Diff line
		@@ -699,7 +699,8 @@ static int ovl_lower_dir(const char name, struct path path,
		* The inodes index feature needs to encode and decode file
		* handles, so it requires that all layers support them.
		*/
		if (ofs->config.index && !ovl_can_decode_fh(path->dentry->d_sb)) {
		if (ofs->config.index && ofs->config.upperdir &&
		!ovl_can_decode_fh(path->dentry->d_sb)) {
		ofs->config.index = false;
		pr_warn("overlayfs: fs on '%s' does not support file handles, falling back to index=off.\n", name);
		}
		@@ -1268,11 +1269,16 @@ static int ovl_fill_super(struct super_block sb, void data, int silent)
		if (err)
		goto out_free_oe;

		if (!ofs->indexdir)
		/* Force r/o mount with no index dir */
		if (!ofs->indexdir) {
		dput(ofs->workdir);
		ofs->workdir = NULL;
		sb->s_flags \|= SB_RDONLY;
		}

		/* Show index=off/on in /proc/mounts for any of the reasons above */
		}

		/* Show index=off in /proc/mounts for forced r/o mount */
		if (!ofs->indexdir)
		ofs->config.index = false;

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