There's user-visible misbehavour in sys_write(): when user tries to put
down to disk some data, which crosses boundary of existing memory, sys_write()
either immediately returns with EFAULT or writes first page(s).
Next 2 patches make sys_write()'s behaviour more consistent: it tries now
to write down all what it can.
Vitaly Mayatskikh (2):
Introduce check_readable_bytes()
Perform checks in iov_iter_fault_in_readable() with
check_readable_bytes()
fs/fuse/file.c | 6 ++++--
include/linux/pagemap.h | 35 +++++++++++++++++++++++++++++++++++
mm/filemap.c | 13 +++++++++----
3 files changed, 48 insertions(+), 6 deletions(-)
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