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[97.113.13.231]) by smtp.gmail.com with ESMTPSA id i7sm11397448pfo.19.2019.05.19.13.38.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 19 May 2019 13:38:17 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Sun, 19 May 2019 13:36:50 -0700 Message-Id: <20190519203726.20729-39-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190519203726.20729-1-richard.henderson@linaro.org> References: <20190519203726.20729-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::441 Subject: [Qemu-devel] [PATCH v7 38/74] linux-user: Split out sync, syncfs X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent@vivier.eu Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Note that syncfs is universally available. If !CONFIG_SYNCFS, provide our own syscall replacement. Signed-off-by: Richard Henderson --- linux-user/syscall-defs.h | 2 ++ linux-user/syscall-file.inc.c | 11 +++++++++++ linux-user/syscall.c | 20 ++++++++++++-------- linux-user/strace.list | 6 ------ 4 files changed, 25 insertions(+), 14 deletions(-) diff --git a/linux-user/syscall-defs.h b/linux-user/syscall-defs.h index 860754aaca..497fbdba66 100644 --- a/linux-user/syscall-defs.h +++ b/linux-user/syscall-defs.h @@ -171,6 +171,8 @@ SYSCALL_DEF(shmget, ARG_DEC, ARG_DEC, ARG_HEX); #ifdef TARGET_NR_stime SYSCALL_DEF(stime, ARG_PTR); #endif +SYSCALL_DEF(sync); +SYSCALL_DEF(syncfs, ARG_DEC); #ifdef TARGET_NR_time SYSCALL_DEF(time, ARG_PTR); #endif diff --git a/linux-user/syscall-file.inc.c b/linux-user/syscall-file.inc.c index 5e276d13bc..9f3cf7221a 100644 --- a/linux-user/syscall-file.inc.c +++ b/linux-user/syscall-file.inc.c @@ -873,6 +873,17 @@ SYSCALL_IMPL(readlinkat) } #endif +SYSCALL_IMPL(sync) +{ + sync(); + return 0; +} + +SYSCALL_IMPL(syncfs) +{ + return get_errno(syncfs(arg1)); +} + static abi_long do_umount2(abi_ulong target_path, int flags) { char *p = lock_user_string(target_path); diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 6d30e8ff2f..d612dade23 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -199,6 +199,15 @@ static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, \ #define __NR_sys_gettid __NR_gettid _syscall0(int, sys_gettid) +/* + * These definitions produce an ENOSYS from the host kernel. + * Performing a bogus syscall is easier than boilerplating + * the replacement functions here in C. + */ +#ifndef __NR_syncfs +#define __NR_syncfs -1 +#endif + /* For the 64-bit guest on 32-bit host case we must emulate * getdents using getdents64, because otherwise the host * might hand us back more dirent records than we can fit @@ -254,11 +263,13 @@ _syscall3(int, ioprio_set, int, which, int, who, int, ioprio) #if defined(TARGET_NR_getrandom) && defined(__NR_getrandom) _syscall3(int, getrandom, void *, buf, size_t, buflen, unsigned int, flags) #endif - #if defined(TARGET_NR_kcmp) && defined(__NR_kcmp) _syscall5(int, kcmp, pid_t, pid1, pid_t, pid2, int, type, unsigned long, idx1, unsigned long, idx2) #endif +#ifndef CONFIG_SYNCFS +_syscall1(int, syncfs, int, fd) +#endif static bitmask_transtbl fcntl_flags_tbl[] = { { TARGET_O_ACCMODE, TARGET_O_WRONLY, O_ACCMODE, O_WRONLY, }, @@ -5380,13 +5391,6 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, void *p; switch(num) { - case TARGET_NR_sync: - sync(); - return 0; -#if defined(TARGET_NR_syncfs) && defined(CONFIG_SYNCFS) - case TARGET_NR_syncfs: - return get_errno(syncfs(arg1)); -#endif case TARGET_NR_kill: return get_errno(safe_kill(arg1, target_to_host_signal(arg2))); #ifdef TARGET_NR_rename diff --git a/linux-user/strace.list b/linux-user/strace.list index 3161546afc..749bdce638 100644 --- a/linux-user/strace.list +++ b/linux-user/strace.list @@ -1260,12 +1260,6 @@ #ifdef TARGET_NR_symlinkat { TARGET_NR_symlinkat, "symlinkat", NULL, print_symlinkat, NULL }, #endif -#ifdef TARGET_NR_sync -{ TARGET_NR_sync, "sync" , NULL, NULL, NULL }, -#endif -#ifdef TARGET_NR_syncfs -{ TARGET_NR_syncfs, "syncfs" , "%s(%d)", NULL, NULL }, -#endif #ifdef TARGET_NR_syscall { TARGET_NR_syscall, "syscall" , NULL, NULL, NULL }, #endif -- 2.17.1