linux-ext4 - [PATCH STABLE 5.10 5.4 4.19 4.14] ext4: add check to prevent attempting to resize an fs with sparse

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Message-Id: <20220313044449.1260655-1-tytso@mit.edu>
Date:   Sat, 12 Mar 2022 23:44:49 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     stable@...r.kernel.org
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Josh Triplett <josh@...htriplett.org>,
        "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH STABLE 5.10 5.4 4.19 4.14] ext4: add check to prevent attempting to resize an fs with sparse_super2

From: Josh Triplett <josh@...htriplett.org>

commit b1489186cc8391e0c1e342f9fbc3eedf6b944c61 upstream.

The in-kernel ext4 resize code doesn't support filesystem with the
sparse_super2 feature. It fails with errors like this and doesn't
finish the resize:

EXT4-fs (loop0): resizing filesystem from 16640 to 7864320 blocks
EXT4-fs warning (device loop0): verify_reserved_gdb:760: reserved GDT 2 missing grp 1 (32770)
EXT4-fs warning (device loop0): ext4_resize_fs:2111: error (-22) occurred during file system resize
EXT4-fs (loop0): resized filesystem to 2097152

To reproduce:
mkfs.ext4 -b 4096 -I 256 -J size=32 -E resize=$((256*1024*1024)) -O sparse_super2 ext4.img 65M
truncate -s 30G ext4.img
mount ext4.img /mnt
python3 -c 'import fcntl, os, struct ; fd = os.open("/mnt", os.O_RDONLY | os.O_DIRECTORY) ; fcntl.ioctl(fd, 0x40086610, struct.pack("Q", 30 * 1024 * 1024 * 1024 // 4096), False) ; os.close(fd)'
dmesg | tail
e2fsck ext4.img

The userspace resize2fs tool has a check for this case: it checks if
the filesystem has sparse_super2 set and if the kernel provides
/sys/fs/ext4/features/sparse_super2. However, the former check
requires manually reading and parsing the filesystem superblock.

Detect this case in ext4_resize_begin and error out early with a clear
error message.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
Link: https://lore.kernel.org/r/74b8ae78405270211943cd7393e65586c5faeed1.1623093259.git.josh@joshtriplett.org
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 fs/ext4/resize.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 928700d57eb6..6513079c728b 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -74,6 +74,11 @@ int ext4_resize_begin(struct super_block *sb)
 		return -EPERM;
 	}
 
+	if (ext4_has_feature_sparse_super2(sb)) {
+		ext4_msg(sb, KERN_ERR, "Online resizing not supported with sparse_super2");
+		return -EOPNOTSUPP;
+	}
+
 	if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
 				  &EXT4_SB(sb)->s_ext4_flags))
 		ret = -EBUSY;
-- 
2.31.0