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From 0717c1cdfeaedc98df8af97b5ab110830e176a5b Mon Sep 17 00:00:00 2001
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From: Gao Xiang <hsiangkao@redhat.com>
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Date: Thu, 3 Feb 2022 12:42:30 -0500
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Subject: [PATCH 2/2] xfsdump: intercept bind mount targets
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It's a bit strange pointing at some non-root bind mount target and
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then actually dumping from the actual root dir instead.
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Therefore, instead of searching for the root dir of the filesystem,
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just intercept all bind mount targets by checking whose ino # of
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".." is itself with getdents.
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Fixes: 25195ebf107d ("xfsdump: handle bind mount targets")
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Cc: Eric Sandeen <sandeen@redhat.com>
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Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
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[sandeen: add explanatory comment to new function]
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Reviewed-by: Eric Sandeen <sandeen@redhat.com>
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Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
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---
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Index: xfsdump-3.1.8/dump/content.c
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===================================================================
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--- xfsdump-3.1.8.orig/dump/content.c
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+++ xfsdump-3.1.8/dump/content.c
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@@ -511,6 +511,60 @@ static bool_t create_inv_session(
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ix_t subtreecnt,
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size_t strmix);
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+/*
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+ * Verify that we are asked to dump from the root of the filesystem;
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+ * test this by checking whether the inode number we've been given matches
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+ * the inode number for this directory's ".."
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+ */
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+static bool_t
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+check_rootdir(int fd,
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+ xfs_ino_t ino)
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+{
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+ struct dirent *gdp;
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+ size_t gdsz;
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+ bool_t found = BOOL_FALSE;
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+
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+ gdsz = sizeof(struct dirent) + NAME_MAX + 1;
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+ if (gdsz < GETDENTSBUF_SZ_MIN)
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+ gdsz = GETDENTSBUF_SZ_MIN;
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+ gdp = (struct dirent *)calloc(1, gdsz);
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+ assert(gdp);
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+
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+ while (1) {
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+ struct dirent *p;
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+ int nread;
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+
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+ nread = getdents_wrap(fd, (char *)gdp, gdsz);
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+ /*
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+ * negative count indicates something very bad happened;
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+ * try to gracefully end this dir.
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+ */
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+ if (nread < 0) {
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+ mlog(MLOG_NORMAL | MLOG_WARNING,
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+_("unable to read dirents for directory ino %llu: %s\n"),
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+ ino, strerror(errno));
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+ break;
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+ }
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+
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+ /* no more directory entries: break; */
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+ if (!nread)
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+ break;
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+
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+ for (p = gdp; nread > 0;
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+ nread -= (int)p->d_reclen,
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+ assert(nread >= 0),
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+ p = (struct dirent *)((char *)p + p->d_reclen)) {
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+ if (!strcmp(p->d_name, "..")) {
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+ if (p->d_ino == ino)
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+ found = BOOL_TRUE;
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+ break;
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+ }
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+ }
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+ }
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+ free(gdp);
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+ return found;
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+}
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+
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bool_t
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content_init( int argc,
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char *argv[ ],
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@@ -1394,6 +1448,14 @@ baseuuidbypass:
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mntpnt );
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return BOOL_FALSE;
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}
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+
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+ if (!check_rootdir(sc_fsfd, rootstat.st_ino)) {
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+ mlog(MLOG_ERROR,
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+_("%s is not the root of the filesystem (bind mount?) - use primary mountpoint\n"),
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+ mntpnt);
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+ return BOOL_FALSE;
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+ }
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+
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sc_rootxfsstatp =
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( xfs_bstat_t * )calloc( 1, sizeof( xfs_bstat_t ));
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assert( sc_rootxfsstatp );
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