8 files changed, 106 insertions, 0 deletions

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index db0c803170ab..a505202086e8 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -828,4 +828,6 @@ ia32_sys_call_table:
         .quad sys_dup3                  /* 330 */
         .quad sys_pipe2
         .quad sys_inotify_init1
+        .quad compat_sys_preadv
+        .quad compat_sys_pwritev
 ia32_syscall_end:
diff --git a/arch/x86/include/asm/unistd_32.h b/arch/x86/include/asm/unistd_32.h
index f2bba78430a4..6e72d74cf8dc 100644
--- a/arch/x86/include/asm/unistd_32.h
+++ b/arch/x86/include/asm/unistd_32.h
@@ -338,6 +338,8 @@
 #define __NR_dup3               330
 #define __NR_pipe2              331
 #define __NR_inotify_init1      332
+#define __NR_preadv             333
+#define __NR_pwritev            334
 
 #ifdef __KERNEL__
 
diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h
index d2e415e6666f..f81829462325 100644
--- a/arch/x86/include/asm/unistd_64.h
+++ b/arch/x86/include/asm/unistd_64.h
@@ -653,6 +653,10 @@ __SYSCALL(__NR_dup3, sys_dup3)
 __SYSCALL(__NR_pipe2, sys_pipe2)
 #define __NR_inotify_init1                      294
 __SYSCALL(__NR_inotify_init1, sys_inotify_init1)
+#define __NR_preadv                             295
+__SYSCALL(__NR_preadv, sys_preadv)
+#define __NR_pwritev                            296
+__SYSCALL(__NR_pwritev, sys_pwritev)
 
 
 #ifndef __NO_STUBS
diff --git a/arch/x86/kernel/syscall_table_32.S b/arch/x86/kernel/syscall_table_32.S
index 3bdb64829b82..ff5c8736b491 100644
--- a/arch/x86/kernel/syscall_table_32.S
+++ b/arch/x86/kernel/syscall_table_32.S
@@ -332,3 +332,5 @@ ENTRY(sys_call_table)
         .long sys_dup3                  /* 330 */
         .long sys_pipe2
         .long sys_inotify_init1
+        .long sys_preadv
+        .long sys_pwritev
diff --git a/fs/compat.c b/fs/compat.c
index e04b4660db84..7c1615183d1e 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1232,6 +1232,24 @@ compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
         return ret;
 }
 
+asmlinkage ssize_t
+compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
+                  unsigned long vlen, u32 pos_high, u32 pos_low)
+{
+        loff_t pos = ((loff_t)pos_high << 32) | pos_low;
+        struct file *file;
+        ssize_t ret;
+
+        if (pos < 0)
+                return -EINVAL;
+        file = fget(fd);
+        if (!file)
+                return -EBADF;
+        ret = compat_readv(file, vec, vlen, &pos);
+        fput(file);
+        return ret;
+}
+
 static size_t compat_writev(struct file *file,
                             const struct compat_iovec __user *vec,
                             unsigned long vlen, loff_t *pos)
@@ -1269,6 +1287,24 @@ compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
         return ret;
 }
 
+asmlinkage ssize_t
+compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
+                   unsigned long vlen, u32 pos_high, u32 pos_low)
+{
+        loff_t pos = ((loff_t)pos_high << 32) | pos_low;
+        struct file *file;
+        ssize_t ret;
+
+        if (pos < 0)
+                return -EINVAL;
+        file = fget(fd);
+        if (!file)
+                return -EBADF;
+        ret = compat_writev(file, vec, vlen, &pos);
+        fput(file);
+        return ret;
+}
+
 asmlinkage long
 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
                     unsigned int nr_segs, unsigned int flags)
diff --git a/fs/read_write.c b/fs/read_write.c
index 400fe81c973e..6d5d8ff238aa 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -731,6 +731,56 @@ SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
         return ret;
 }
 
+SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
+                unsigned long, vlen, u32, pos_high, u32, pos_low)
+{
+        loff_t pos = ((loff_t)pos_high << 32) | pos_low;
+        struct file *file;
+        ssize_t ret = -EBADF;
+        int fput_needed;
+
+        if (pos < 0)
+                return -EINVAL;
+
+        file = fget_light(fd, &fput_needed);
+        if (file) {
+                ret = -ESPIPE;
+                if (file->f_mode & FMODE_PREAD)
+                        ret = vfs_readv(file, vec, vlen, &pos);
+                fput_light(file, fput_needed);
+        }
+
+        if (ret > 0)
+                add_rchar(current, ret);
+        inc_syscr(current);
+        return ret;
+}
+
+SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
+                unsigned long, vlen, u32, pos_high, u32, pos_low)
+{
+        loff_t pos = ((loff_t)pos_high << 32) | pos_low;
+        struct file *file;
+        ssize_t ret = -EBADF;
+        int fput_needed;
+
+        if (pos < 0)
+                return -EINVAL;
+
+        file = fget_light(fd, &fput_needed);
+        if (file) {
+                ret = -ESPIPE;
+                if (file->f_mode & FMODE_PWRITE)
+                        ret = vfs_writev(file, vec, vlen, &pos);
+                fput_light(file, fput_needed);
+        }
+
+        if (ret > 0)
+                add_wchar(current, ret);
+        inc_syscw(current);
+        return ret;
+}
+
 static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
                            size_t count, loff_t max)
 {
diff --git a/include/linux/compat.h b/include/linux/compat.h
index b880864672de..9723edd6455c 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -191,6 +191,12 @@ asmlinkage ssize_t compat_sys_readv(unsigned long fd,
                 const struct compat_iovec __user *vec, unsigned long vlen);
 asmlinkage ssize_t compat_sys_writev(unsigned long fd,
                 const struct compat_iovec __user *vec, unsigned long vlen);
+asmlinkage ssize_t compat_sys_preadv(unsigned long fd,
+                const struct compat_iovec __user *vec,
+                unsigned long vlen, u32 pos_high, u32 pos_low);
+asmlinkage ssize_t compat_sys_pwritev(unsigned long fd,
+                const struct compat_iovec __user *vec,
+                unsigned long vlen, u32 pos_high, u32 pos_low);
 
 int compat_do_execve(char * filename, compat_uptr_t __user *argv,
                 compat_uptr_t __user *envp, struct pt_regs * regs);
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index f9f900cfd066..b299a82a05e7 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -461,6 +461,10 @@ asmlinkage long sys_pread64(unsigned int fd, char __user *buf,
                             size_t count, loff_t pos);
 asmlinkage long sys_pwrite64(unsigned int fd, const char __user *buf,
                              size_t count, loff_t pos);
+asmlinkage long sys_preadv(unsigned long fd, const struct iovec __user *vec,
+                           unsigned long vlen, u32 pos_high, u32 pos_low);
+asmlinkage long sys_pwritev(unsigned long fd, const struct iovec __user *vec,
+                            unsigned long vlen, u32 pos_high, u32 pos_low);
 asmlinkage long sys_getcwd(char __user *buf, unsigned long size);
 asmlinkage long sys_mkdir(const char __user *pathname, int mode);
 asmlinkage long sys_chdir(const char __user *filename);