When copying large files into a ext filesystem at mkfs time the copy fails at 2^31 bytes in. There are two problems: copy_file_chunk() passes an offset (off_t, 64-bit typically) to ext2fs_file_lseek() which expects a ext2_off_t (typedef to __u32) so the value is truncated. Solve by calling ext2fs_file_llseek() which takes a u64 offset instead. try_lseek_copy() rounds the data and hole offsets as found by lseek() to block boundaries, but the calculation gets truncated to 32-bits. Solve by casting the 32-bit blocksize to off_t to ensure this doesn't happen. Signed-off-by: Ross Burton <ross.burton@xxxxxxxxx> --- misc/create_inode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/misc/create_inode.c b/misc/create_inode.c index 05aa6363..f106dcda 100644 --- a/misc/create_inode.c +++ b/misc/create_inode.c @@ -438,7 +438,7 @@ static errcode_t copy_file_chunk(ext2_filsys fs, int fd, ext2_file_t e2_file, ptr += blen; continue; } - err = ext2fs_file_lseek(e2_file, off + bpos, + err = ext2fs_file_llseek(e2_file, off + bpos, EXT2_SEEK_SET, NULL); if (err) goto fail; @@ -481,7 +481,7 @@ static errcode_t try_lseek_copy(ext2_filsys fs, int fd, struct stat *statbuf, return EXT2_ET_UNIMPLEMENTED; data_blk = data & ~(fs->blocksize - 1); - hole_blk = (hole + (fs->blocksize - 1)) & ~(fs->blocksize - 1); + hole_blk = (hole + (off_t)(fs->blocksize - 1)) & ~(off_t)(fs->blocksize - 1); err = copy_file_chunk(fs, fd, e2_file, data_blk, hole_blk, buf, zerobuf); if (err) -- 2.11.0
