From: Taotao Chen <chentao...@didiglobal.com> Without O_LARGEFILE, file->f_op->write_iter calls generic_write_check_limits(), which enforces a 2GB (MAX_NON_LFS) limit, causing -EFBIG on large writes.
In shmem_pwrite(), this error is later masked as -EIO due to the error handling order, leading to igt failures like gen9_exec_parse(bb-large). Set O_LARGEFILE in __create_shmem() to prevent -EFBIG on large writes. Reported-by: kernel test robot <oliver.s...@intel.com> Closes: https://lore.kernel.org/oe-lkp/202508081029.343192ec-...@intel.com Fixes: 048832a3f400 ("drm/i915: Refactor shmem_pwrite() to use kiocb and write_iter") Signed-off-by: Taotao Chen <chentao...@didiglobal.com> --- drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c index e3d188455f67..2b53aad915f5 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c @@ -514,6 +514,11 @@ static int __create_shmem(struct drm_i915_private *i915, if (IS_ERR(filp)) return PTR_ERR(filp); + /* + * Prevent -EFBIG by allowing large writes beyond MAX_NON_LFS on shmem + * objects by setting O_LARGEFILE. + */ + filp->f_flags |= O_LARGEFILE; obj->filp = filp; return 0; } -- 2.34.1
