[PATCH v3 2/2] xfsdump: intercept bind mount targets

[Gao Xiang <hsiangkao@redhat.com>]

It's a bit strange pointing at some non-root bind mount target and
then actually dumping from the actual root dir instead.

Therefore, instead of searching for the root dir of the filesystem,
just intercept all bind mount targets by checking whose ino # of
".." is itself with getdents.

Fixes: 25195ebf107d ("xfsdump: handle bind mount targets")
Cc: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
changes since v2 (Eric):
 - error out the case where the directory cannot be read;
 - In any case, stop as soon as we have found "..";
 - update the mountpoint error message and use i18n instead;

 dump/content.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/dump/content.c b/dump/content.c
index c11d9b4..c248e74 100644
--- a/dump/content.c
+++ b/dump/content.c
@@ -511,6 +511,55 @@ static bool_t create_inv_session(
 		ix_t subtreecnt,
 		size_t strmix);
 
+static bool_t
+check_rootdir(int fd,
+	      xfs_ino_t ino)
+{
+	struct dirent	*gdp;
+	size_t		gdsz;
+	bool_t		found = BOOL_FALSE;
+
+	gdsz = sizeof(struct dirent) + NAME_MAX + 1;
+	if (gdsz < GETDENTSBUF_SZ_MIN)
+		gdsz = GETDENTSBUF_SZ_MIN;
+	gdp = (struct dirent *)calloc(1, gdsz);
+	assert(gdp);
+
+	while (1) {
+		struct dirent *p;
+		int nread;
+
+		nread = getdents_wrap(fd, (char *)gdp, gdsz);
+		/*
+		 * negative count indicates something very bad happened;
+		 * try to gracefully end this dir.
+		 */
+		if (nread < 0) {
+			mlog(MLOG_NORMAL | MLOG_WARNING,
+_("unable to read dirents for directory ino %llu: %s\n"),
+			      ino, strerror(errno));
+			break;
+		}
+
+		/* no more directory entries: break; */
+		if (!nread)
+			break;
+
+		for (p = gdp; nread > 0;
+		     nread -= (int)p->d_reclen,
+		     assert(nread >= 0),
+		     p = (struct dirent *)((char *)p + p->d_reclen)) {
+			if (!strcmp(p->d_name, "..")) {
+				if (p->d_ino == ino)
+					found = BOOL_TRUE;
+				break;
+			}
+		}
+	}
+	free(gdp);
+	return found;
+}
+
 bool_t
 content_init(int argc,
 	      char *argv[],
@@ -1393,6 +1442,14 @@ baseuuidbypass:
 			      mntpnt);
 			return BOOL_FALSE;
 		}
+
+		if (!check_rootdir(sc_fsfd, rootstat.st_ino)) {
+			mlog(MLOG_ERROR,
+_("%s is not the root of the filesystem (bind mount?) - use primary mountpoint\n"),
+			     mntpnt);
+			return BOOL_FALSE;
+		}
+
 		sc_rootxfsstatp =
 			(struct xfs_bstat *)calloc(1, sizeof(struct xfs_bstat));
 		assert(sc_rootxfsstatp);
-- 
2.18.1