101 lines
2.7 KiB
Diff
101 lines
2.7 KiB
Diff
|
From 0717c1cdfeaedc98df8af97b5ab110830e176a5b Mon Sep 17 00:00:00 2001
|
||
|
|
From: Gao Xiang <hsiangkao@redhat.com>
|
||
|
|
Date: Thu, 3 Feb 2022 12:42:30 -0500
|
||
|
|
Subject: [PATCH 2/2] xfsdump: intercept bind mount targets
|
||
|
|
|
||
|
|
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>
|
||
|
|
[sandeen: add explanatory comment to new function]
|
||
|
|
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
|
||
|
|
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
|
||
|
|
---
|
||
|
|
|
||
|
|
Index: xfsdump-3.1.8/dump/content.c
|
||
|
|
===================================================================
|
||
|
|
--- xfsdump-3.1.8.orig/dump/content.c
|
||
|
|
+++ xfsdump-3.1.8/dump/content.c
|
||
|
|
@@ -511,6 +511,60 @@ static bool_t create_inv_session(
|
||
|
|
ix_t subtreecnt,
|
||
|
|
size_t strmix);
|
||
|
|
|
||
|
|
+/*
|
||
|
|
+ * Verify that we are asked to dump from the root of the filesystem;
|
||
|
|
+ * test this by checking whether the inode number we've been given matches
|
||
|
|
+ * the inode number for this directory's ".."
|
||
|
|
+ */
|
||
|
|
+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[ ],
|
||
|
|
@@ -1394,6 +1448,14 @@ 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 =
|
||
|
|
( xfs_bstat_t * )calloc( 1, sizeof( xfs_bstat_t ));
|
||
|
|
assert( sc_rootxfsstatp );
|