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SubjectRe: [PATCH 19/45] fs/quota: use COMPAT_SYSCALL_DEFINE for sys32_quotactl()
On Thu 22-03-18 10:00:33, Dominik Brodowski wrote:
> While sys32_quotactl() is only needed on x86, it can use the recommended
> COMPAT_SYSCALL_DEFINEx() machinery for its setup.
>
> Cc: Jan Kara <jack@suse.com>
> Cc: Christoph Hellwig <hch@infradead.org>
> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

Looks good AFAICT. You can add:

Acked-by: Jan Kara <jack@suse.cz>

Honza


> ---
> arch/x86/entry/syscalls/syscall_32.tbl | 2 +-
> fs/quota/compat.c | 5 +++--
> include/linux/compat.h | 3 +++
> include/linux/syscalls.h | 4 +---
> kernel/sys_ni.c | 2 +-
> 5 files changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
> index 2a5e99cff859..09338dd2bd94 100644
> --- a/arch/x86/entry/syscalls/syscall_32.tbl
> +++ b/arch/x86/entry/syscalls/syscall_32.tbl
> @@ -137,7 +137,7 @@
> 128 i386 init_module sys_init_module
> 129 i386 delete_module sys_delete_module
> 130 i386 get_kernel_syms
> -131 i386 quotactl sys_quotactl sys32_quotactl
> +131 i386 quotactl sys_quotactl compat_sys_quotactl32
> 132 i386 getpgid sys_getpgid
> 133 i386 fchdir sys_fchdir
> 134 i386 bdflush sys_bdflush
> diff --git a/fs/quota/compat.c b/fs/quota/compat.c
> index 1577a2fd51f4..c30572857619 100644
> --- a/fs/quota/compat.c
> +++ b/fs/quota/compat.c
> @@ -41,8 +41,9 @@ struct compat_fs_quota_stat {
> __u16 qs_iwarnlimit;
> };
>
> -asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
> - qid_t id, void __user *addr)
> +COMPAT_SYSCALL_DEFINE4(quotactl32, unsigned int, cmd,
> + const char __user *, special, qid_t, id,
> + void __user *, addr)
> {
> unsigned int cmds;
> struct if_dqblk __user *dqblk;
> diff --git a/include/linux/compat.h b/include/linux/compat.h
> index 16c3027074a2..f1649a5e6716 100644
> --- a/include/linux/compat.h
> +++ b/include/linux/compat.h
> @@ -461,6 +461,9 @@ asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
> const struct compat_iovec __user *vec,
> compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
>
> +asmlinkage long compat_sys_quotactl32(unsigned int cmd,
> + const char __user *special, qid_t id, void __user *addr);
> +
> #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
> asmlinkage long compat_sys_preadv64(unsigned long fd,
> const struct compat_iovec __user *vec,
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index f30083190ae4..a3f42f5f3b08 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -241,8 +241,6 @@ static inline void addr_limit_user_check(void)
> #endif
> }
>
> -asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
> - qid_t id, void __user *addr);
> asmlinkage long sys_time(time_t __user *tloc);
> asmlinkage long sys_stime(time_t __user *tptr);
> asmlinkage long sys_gettimeofday(struct timeval __user *tv,
> @@ -625,7 +623,7 @@ asmlinkage long sys_chdir(const char __user *filename);
> asmlinkage long sys_fchdir(unsigned int fd);
> asmlinkage long sys_rmdir(const char __user *pathname);
> asmlinkage long sys_lookup_dcookie(u64 cookie64, char __user *buf, size_t len);
> -asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special,
> +asmlinkage long sys_quotactl32(unsigned int cmd, const char __user *special,
> qid_t id, void __user *addr);
> asmlinkage long sys_getdents(unsigned int fd,
> struct linux_dirent __user *dirent,
> diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
> index b5189762d275..951dbda5c2b4 100644
> --- a/kernel/sys_ni.c
> +++ b/kernel/sys_ni.c
> @@ -18,7 +18,7 @@ asmlinkage long sys_ni_syscall(void)
> }
>
> cond_syscall(sys_quotactl);
> -cond_syscall(sys32_quotactl);
> +cond_syscall(compat_sys_quotactl32);
> cond_syscall(sys_acct);
> cond_syscall(sys_lookup_dcookie);
> cond_syscall(compat_sys_lookup_dcookie);
> --
> 2.16.2
>
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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