fuse2fs: fix block parameter truncation on 32-bit

Use the blk64_t variants of the io channel read/write methods when we
have to do partial block zeroing for hole punching because otherwise
we corrupt large 64-bit filesystems on 32-bit fuse2fs due to integer
truncation.

Cc: linux-ext4@vger.kernel.org # v1.43
Fixes: 81cbf1ef4f5dab ("misc: add fuse2fs, a FUSE server for e2fsprogs")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20250730172324.GR2672022@frogsfrogsfrogs
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index c6b1684f53e2e4e8afce13f3a89a556675f8a0d5..4d42a634bf377b7dd60ddadfa085134e82584e67 100644 (file)
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -4168,13 +4168,13 @@ static errcode_t clean_block_middle(struct fuse2fs *ff, ext2_ino_t ino,
        if (!blk || (retflags & BMAP_RET_UNINIT))
                return 0;
 
-       err = io_channel_read_blk(fs->io, blk, 1, *buf);
+       err = io_channel_read_blk64(fs->io, blk, 1, *buf);
        if (err)
                return err;
 
        memset(*buf + residue, 0, len);
 
-       return io_channel_write_blk(fs->io, blk, 1, *buf);
+       return io_channel_write_blk64(fs->io, blk, 1, *buf);
 }
 
 static errcode_t clean_block_edge(struct fuse2fs *ff, ext2_ino_t ino,
@@ -4202,7 +4202,7 @@ static errcode_t clean_block_edge(struct fuse2fs *ff, ext2_ino_t ino,
        if (err)
                return err;
 
-       err = io_channel_read_blk(fs->io, blk, 1, *buf);
+       err = io_channel_read_blk64(fs->io, blk, 1, *buf);
        if (err)
                return err;
        if (!blk || (retflags & BMAP_RET_UNINIT))
@@ -4213,7 +4213,7 @@ static errcode_t clean_block_edge(struct fuse2fs *ff, ext2_ino_t ino,
        else
                memset(*buf + residue, 0, fs->blocksize - residue);
 
-       return io_channel_write_blk(fs->io, blk, 1, *buf);
+       return io_channel_write_blk64(fs->io, blk, 1, *buf);
 }
 
 static int punch_helper(struct fuse_file_info *fp, int mode, off_t offset,