From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: sandeen@sandeen.net, darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org, alex@zadara.com
Subject: [PATCH 2/6] mkfs: check root inode location
Date: Wed, 04 Dec 2019 09:04:35 -0800 [thread overview]
Message-ID: <157547907575.974712.18261328888206083261.stgit@magnolia> (raw)
In-Reply-To: <157547906289.974712.8933333382010386076.stgit@magnolia>
From: Darrick J. Wong <darrick.wong@oracle.com>
Make sure the root inode gets created where repair thinks it should be
created.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
libxfs/libxfs_api_defs.h | 1 +
mkfs/xfs_mkfs.c | 39 +++++++++++++++++++++++++++++++++------
2 files changed, 34 insertions(+), 6 deletions(-)
diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index 645c9b1b..f8e7d82d 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -156,5 +156,6 @@
#define xfs_ag_init_headers libxfs_ag_init_headers
#define xfs_buf_delwri_submit libxfs_buf_delwri_submit
+#define xfs_ialloc_calc_rootino libxfs_ialloc_calc_rootino
#endif /* __LIBXFS_API_DEFS_H__ */
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 18338a61..71be033d 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -3521,6 +3521,38 @@ rewrite_secondary_superblocks(
libxfs_writebuf(buf, LIBXFS_EXIT_ON_FAILURE);
}
+static void
+check_root_ino(
+ struct xfs_mount *mp)
+{
+ xfs_ino_t ino;
+
+ if (XFS_INO_TO_AGNO(mp, mp->m_sb.sb_rootino) != 0) {
+ fprintf(stderr,
+ _("%s: root inode created in AG %u, not AG 0\n"),
+ progname, XFS_INO_TO_AGNO(mp, mp->m_sb.sb_rootino));
+ exit(1);
+ }
+
+ /*
+ * The superblock points to the root directory inode, but xfs_repair
+ * expects to find the root inode in a very specific location computed
+ * from the filesystem geometry for an extra level of verification.
+ *
+ * Fail the format immediately if those assumptions ever break, because
+ * repair will toss the root directory.
+ */
+ ino = libxfs_ialloc_calc_rootino(mp, -1);
+ if (mp->m_sb.sb_rootino != ino) {
+ fprintf(stderr,
+ _("%s: root inode (%llu) not allocated in expected location (%llu)\n"),
+ progname,
+ (unsigned long long)mp->m_sb.sb_rootino,
+ (unsigned long long)ino);
+ exit(1);
+ }
+}
+
int
main(
int argc,
@@ -3807,12 +3839,7 @@ main(
/*
* Protect ourselves against possible stupidity
*/
- if (XFS_INO_TO_AGNO(mp, mp->m_sb.sb_rootino) != 0) {
- fprintf(stderr,
- _("%s: root inode created in AG %u, not AG 0\n"),
- progname, XFS_INO_TO_AGNO(mp, mp->m_sb.sb_rootino));
- exit(1);
- }
+ check_root_ino(mp);
/*
* Re-write multiple secondary superblocks with rootinode field set
next prev parent reply other threads:[~2019-12-04 17:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-04 17:04 [PATCH v2 0/6] xfs_repair: do not trash valid root dirs Darrick J. Wong
2019-12-04 17:04 ` [PATCH 1/6] xfs: don't commit sunit/swidth updates to disk if that would cause repair failures Darrick J. Wong
2019-12-04 17:04 ` Darrick J. Wong [this message]
2019-12-05 14:36 ` [PATCH 2/6] mkfs: check root inode location Brian Foster
2019-12-04 17:04 ` [PATCH 3/6] xfs_repair: enforce that inode btree chunks can't point to AG headers Darrick J. Wong
2019-12-05 14:37 ` Brian Foster
2019-12-05 16:28 ` Darrick J. Wong
2019-12-06 16:00 ` Brian Foster
2019-12-12 19:11 ` Eric Sandeen
2019-12-12 20:38 ` Eric Sandeen
2019-12-12 22:10 ` Darrick J. Wong
2019-12-04 17:04 ` [PATCH 4/6] xfs_repair: refactor fixed inode location checks Darrick J. Wong
2019-12-05 14:37 ` Brian Foster
2019-12-04 17:04 ` [PATCH 5/6] xfs_repair: use libxfs function to calculate root inode location Darrick J. Wong
2019-12-05 14:37 ` Brian Foster
2019-12-04 17:05 ` [PATCH 6/6] xfs_repair: check plausibility of root dir pointer before trashing it Darrick J. Wong
2019-12-05 14:38 ` Brian Foster
2019-12-12 22:46 ` [PATCH 6/6] xfs_repair: check plausibility of root dir pointer before trashing it\ Darrick J. Wong
2019-12-13 11:19 ` Brian Foster
2019-12-16 16:34 ` Darrick J. Wong
2019-12-17 11:32 ` Brian Foster
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