Re: [Qemu-devel] [PATCH] linux-user/syscall.c: Notice about lock bitmask translation for fcntl

[Laurent Vivier <laurent@vivier.eu>]

Le 18/12/2015 22:40, Chen Gang a écrit :
> 
> On 12/18/15 17:37, Laurent Vivier wrote:
>>
>> Le 18/12/2015 07:26, Chen Gang a écrit :
>>>
>>> For fcntl, it always needs to notice about it, just like do_fcntl() has
>>> done, or it will cause issue (e.g. alpha host run i386 guest).
>>>
>>> Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
>>> ---
>>>  linux-user/syscall.c |   18 ++++++++++++------
>>>  1 files changed, 12 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
>>> index 0f8adeb..1a60e6f 100644
>>> --- a/linux-user/syscall.c
>>> +++ b/linux-user/syscall.c
>>> @@ -9007,7 +9007,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>>>              if (((CPUARMState *)cpu_env)->eabi) {
>>>                  if (!lock_user_struct(VERIFY_READ, target_efl, arg3, 1)) 
>>>                      goto efault;
>>> -                fl.l_type = tswap16(target_efl->l_type);
>>> +                fl.l_type = target_to_host_bitmask(tswap16(target_fl->l_type),
>>> +                                                   flock_tbl);
>>>                  fl.l_whence = tswap16(target_efl->l_whence);
>>>                  fl.l_start = tswap64(target_efl->l_start);
>>>                  fl.l_len = tswap64(target_efl->l_len);
>>> @@ -9018,7 +9019,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>>>              {
>>>                  if (!lock_user_struct(VERIFY_READ, target_fl, arg3, 1)) 
>>>                      goto efault;
>>> -                fl.l_type = tswap16(target_fl->l_type);
>>> +                fl.l_type = target_to_host_bitmask(tswap16(target_fl->l_type),
>>> +                                                   flock_tbl);
>>>                  fl.l_whence = tswap16(target_fl->l_whence);
>>>                  fl.l_start = tswap64(target_fl->l_start);
>>>                  fl.l_len = tswap64(target_fl->l_len);
>>> @@ -9031,7 +9033,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>>>                  if (((CPUARMState *)cpu_env)->eabi) {
>>>                      if (!lock_user_struct(VERIFY_WRITE, target_efl, arg3, 0)) 
>>>                          goto efault;
>>> -                    target_efl->l_type = tswap16(fl.l_type);
>>> +                    target_efl->l_type = host_to_target_bitmask(
>>> +                                                 tswap16(fl.l_type), flock_tbl);
>>>                      target_efl->l_whence = tswap16(fl.l_whence);
>>>                      target_efl->l_start = tswap64(fl.l_start);
>>>                      target_efl->l_len = tswap64(fl.l_len);
>>> @@ -9042,7 +9045,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>>>                  {
>>>                      if (!lock_user_struct(VERIFY_WRITE, target_fl, arg3, 0)) 
>>>                          goto efault;
>>> -                    target_fl->l_type = tswap16(fl.l_type);
>>> +                    target_fl->l_type = host_to_target_bitmask(
>>> +                                                 tswap16(fl.l_type), flock_tbl);
>>>                      target_fl->l_whence = tswap16(fl.l_whence);
>>>                      target_fl->l_start = tswap64(fl.l_start);
>>>                      target_fl->l_len = tswap64(fl.l_len);
>>> @@ -9058,7 +9062,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>>>              if (((CPUARMState *)cpu_env)->eabi) {
>>>                  if (!lock_user_struct(VERIFY_READ, target_efl, arg3, 1)) 
>>>                      goto efault;
>>> -                fl.l_type = tswap16(target_efl->l_type);
>>> +                fl.l_type = target_to_host_bitmask(tswap16(target_fl->l_type),
>>> +                                                   flock_tbl);
>>>                  fl.l_whence = tswap16(target_efl->l_whence);
>>>                  fl.l_start = tswap64(target_efl->l_start);
>>>                  fl.l_len = tswap64(target_efl->l_len);
>>> @@ -9069,7 +9074,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>>>              {
>>>                  if (!lock_user_struct(VERIFY_READ, target_fl, arg3, 1)) 
>>>                      goto efault;
>>> -                fl.l_type = tswap16(target_fl->l_type);
>>> +                fl.l_type = target_to_host_bitmask(tswap16(target_fl->l_type),
>>> +                                                   flock_tbl);
>>>                  fl.l_whence = tswap16(target_fl->l_whence);
>>>                  fl.l_start = tswap64(target_fl->l_start);
>>>                  fl.l_len = tswap64(target_fl->l_len);
>>>
>>
>> This patch looks good to me, except that script/checkpatch.pl complains
>> about "DOS line ending" and "line over 80 characters".
>>
> 
> I did not get any script/checkpatch.pl complains, originally.
> 
> Does my email client configuration is incorrect, then cause incorrect
> mail format? I guess not. The related reason is below.
> 
>  - I copy your full reply mail contents to a new file (diff.patch).

If you copy, you loose the special characters. I do a "Save as".

> 
>  - Remove all '> ' in vi editor (1,% s/^> //g) (so get the original
>    patch contents).
> 
>  - ./script/checkpatch.pl diff.patch, it has no any complains.

If I run "file" on the saved file, I have:

    $ file orig.eml
    orig.eml: SMTP mail, ASCII text, with CRLF line terminators

I can convert it with "tr":

    $ tr "\r" "\n" < orig.eml > new.eml

    $ file new.eml
    new.eml: SMTP mail, ASCII text

    $ ./scripts/checkpatch.pl new.eml
    total: 0 errors, 0 warnings, 54 lines checked

    new.eml has no obvious style problems and is ready for submission.

Laurent