[PATCH 1/3] xfs: move kernel-specific superblock validation out of libxfs

From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: darrick.wong@oracle.com, sandeen@sandeen.net, bfoster@redhat.com,
	david@fromorbit.com
Cc: linux-xfs@vger.kernel.org
Subject: [PATCH 1/3] xfs: move kernel-specific superblock validation out of libxfs
Date: Sun, 06 Dec 2020 15:09:26 -0800	[thread overview]
Message-ID: <160729616682.1606994.13360186718552701085.stgit@magnolia> (raw)
In-Reply-To: <160729616025.1606994.13590463307385382944.stgit@magnolia>

From: Darrick J. Wong <darrick.wong@oracle.com>

A couple of the superblock validation checks apply only to the kernel,
so move them to xfs_fc_fill_super before we add the needsrepair "feature",
which will prevent the kernel (but not xfsprogs) from mounting the
filesystem.  This also reduces the diff between kernel and userspace
libxfs.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_sb.c |   27 ---------------------------
 fs/xfs/xfs_super.c     |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 27 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 5aeafa59ed27..05359690aaed 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -382,17 +382,6 @@ xfs_validate_sb_common(
 		return -EFSCORRUPTED;
 	}
 
-	/*
-	 * Until this is fixed only page-sized or smaller data blocks work.
-	 */
-	if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
-		xfs_warn(mp,
-		"File system with blocksize %d bytes. "
-		"Only pagesize (%ld) or less will currently work.",
-				sbp->sb_blocksize, PAGE_SIZE);
-		return -ENOSYS;
-	}
-
 	/*
 	 * Currently only very few inode sizes are supported.
 	 */
@@ -408,22 +397,6 @@ xfs_validate_sb_common(
 		return -ENOSYS;
 	}
 
-	if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
-	    xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
-		xfs_warn(mp,
-		"file system too large to be mounted on this system.");
-		return -EFBIG;
-	}
-
-	/*
-	 * Don't touch the filesystem if a user tool thinks it owns the primary
-	 * superblock.  mkfs doesn't clear the flag from secondary supers, so
-	 * we don't check them at all.
-	 */
-	if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && sbp->sb_inprogress) {
-		xfs_warn(mp, "Offline file system operation in progress!");
-		return -EFSCORRUPTED;
-	}
 	return 0;
 }
 
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index e3e229e52512..599566c1a3b4 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1467,6 +1467,38 @@ xfs_fc_fill_super(
 #endif
 	}
 
+	/*
+	 * Don't touch the filesystem if a user tool thinks it owns the primary
+	 * superblock.  mkfs doesn't clear the flag from secondary supers, so
+	 * we don't check them at all.
+	 */
+	if (mp->m_sb.sb_inprogress) {
+		xfs_warn(mp, "Offline file system operation in progress!");
+		error = -EFSCORRUPTED;
+		goto out_free_sb;
+	}
+
+	/*
+	 * Until this is fixed only page-sized or smaller data blocks work.
+	 */
+	if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
+		xfs_warn(mp,
+		"File system with blocksize %d bytes. "
+		"Only pagesize (%ld) or less will currently work.",
+				mp->m_sb.sb_blocksize, PAGE_SIZE);
+		error = -ENOSYS;
+		goto out_free_sb;
+	}
+
+	/* Ensure this filesystem fits in the page cache limits */
+	if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
+	    xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
+		xfs_warn(mp,
+		"file system too large to be mounted on this system.");
+		error = -EFBIG;
+		goto out_free_sb;
+	}
+
 	/*
 	 * XFS block mappings use 54 bits to store the logical block offset.
 	 * This should suffice to handle the maximum file size that the VFS

