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Date: Mon, 15 Sep 2014 16:20:37 -0400
From: Milosz Tanski <milosz@...in.com>
To: linux-kernel@...r.kernel.org
Cc: Christoph Hellwig <hch@...radead.org>,
linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
Mel Gorman <mgorman@...e.de>,
Volker Lendecke <Volker.Lendecke@...net.de>,
Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>
Subject: [PATCH 2/7] Define new syscalls readv2,preadv2,writev2,pwritev2
New syscalls with an extra flag argument. For now all flags except for 0 are
not supported.
Signed-off-by: Milosz Tanski <milosz@...in.com>
---
fs/read_write.c | 100 +++++++++++++++++++++++++++++++++++++
include/linux/syscalls.h | 12 +++++
include/uapi/asm-generic/unistd.h | 10 +++-
3 files changed, 121 insertions(+), 1 deletion(-)
diff --git a/fs/read_write.c b/fs/read_write.c
index 4747247..6c5030a 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -902,6 +902,29 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
return ret;
}
+SYSCALL_DEFINE4(readv2, unsigned long, fd, const struct iovec __user *, vec,
+ unsigned long, vlen, int, flags)
+{
+ struct fd f = fdget_pos(fd);
+ ssize_t ret = -EBADF;
+
+ if (flags & ~0)
+ return -EINVAL;
+
+ if (f.file) {
+ loff_t pos = file_pos_read(f.file);
+ ret = vfs_readv(f.file, vec, vlen, &pos, flags);
+ if (ret >= 0)
+ file_pos_write(f.file, pos);
+ fdput_pos(f);
+ }
+
+ if (ret > 0)
+ add_rchar(current, ret);
+ inc_syscr(current);
+ return ret;
+}
+
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
@@ -922,6 +945,29 @@ SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
return ret;
}
+SYSCALL_DEFINE4(writev2, unsigned long, fd, const struct iovec __user *, vec,
+ unsigned long, vlen, int, flags)
+{
+ struct fd f = fdget_pos(fd);
+ ssize_t ret = -EBADF;
+
+ if (flags & ~0)
+ return -EINVAL;
+
+ if (f.file) {
+ loff_t pos = file_pos_read(f.file);
+ ret = vfs_writev(f.file, vec, vlen, &pos, flags);
+ if (ret >= 0)
+ file_pos_write(f.file, pos);
+ fdput_pos(f);
+ }
+
+ if (ret > 0)
+ add_wchar(current, ret);
+ inc_syscw(current);
+ return ret;
+}
+
static inline loff_t pos_from_hilo(unsigned long high, unsigned long low)
{
#define HALF_LONG_BITS (BITS_PER_LONG / 2)
@@ -952,6 +998,33 @@ SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
return ret;
}
+SYSCALL_DEFINE6(preadv2, unsigned long, fd, const struct iovec __user *, vec,
+ unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h,
+ int, flags)
+{
+ loff_t pos = pos_from_hilo(pos_h, pos_l);
+ struct fd f;
+ ssize_t ret = -EBADF;
+
+ if (flags & ~0)
+ return -EINVAL;
+ if (pos < 0)
+ return -EINVAL;
+
+ f = fdget(fd);
+ if (f.file) {
+ ret = -ESPIPE;
+ if (f.file->f_mode & FMODE_PREAD)
+ ret = vfs_readv(f.file, vec, vlen, &pos, flags);
+ fdput(f);
+ }
+
+ 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, unsigned long, pos_l, unsigned long, pos_h)
{
@@ -976,6 +1049,33 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
return ret;
}
+SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec,
+ unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h,
+ int, flags)
+{
+ loff_t pos = pos_from_hilo(pos_h, pos_l);
+ struct fd f;
+ ssize_t ret = -EBADF;
+
+ if (flags & ~0)
+ return -EINVAL;
+ if (pos < 0)
+ return -EINVAL;
+
+ f = fdget(fd);
+ if (f.file) {
+ ret = -ESPIPE;
+ if (f.file->f_mode & FMODE_PWRITE)
+ ret = vfs_writev(f.file, vec, vlen, &pos, flags);
+ fdput(f);
+ }
+
+ if (ret > 0)
+ add_wchar(current, ret);
+ inc_syscw(current);
+ return ret;
+}
+
#ifdef CONFIG_COMPAT
static ssize_t compat_do_readv_writev(int type, struct file *file,
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 0f86d85..0c49ae4 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -559,19 +559,31 @@ asmlinkage long sys_readahead(int fd, loff_t offset, size_t count);
asmlinkage long sys_readv(unsigned long fd,
const struct iovec __user *vec,
unsigned long vlen);
+asmlinkage long sys_readv2(unsigned long fd,
+ const struct iovec __user *vec,
+ unsigned long vlen, int flags);
asmlinkage long sys_write(unsigned int fd, const char __user *buf,
size_t count);
asmlinkage long sys_writev(unsigned long fd,
const struct iovec __user *vec,
unsigned long vlen);
+asmlinkage long sys_writev2(unsigned long fd,
+ const struct iovec __user *vec,
+ unsigned long vlen, int flags);
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, unsigned long pos_l, unsigned long pos_h);
+asmlinkage long sys_preadv2(unsigned long fd, const struct iovec __user *vec,
+ unsigned long vlen, unsigned long pos_l, unsigned long pos_h,
+ int flags);
asmlinkage long sys_pwritev(unsigned long fd, const struct iovec __user *vec,
unsigned long vlen, unsigned long pos_l, unsigned long pos_h);
+asmlinkage long sys_pwritev2(unsigned long fd, const struct iovec __user *vec,
+ unsigned long vlen, unsigned long pos_l, unsigned long pos_h,
+ int flags);
asmlinkage long sys_getcwd(char __user *buf, unsigned long size);
asmlinkage long sys_mkdir(const char __user *pathname, umode_t mode);
asmlinkage long sys_chdir(const char __user *filename);
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 11d11bc..75ad687 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -213,6 +213,14 @@ __SC_COMP(__NR_pwrite64, sys_pwrite64, compat_sys_pwrite64)
__SC_COMP(__NR_preadv, sys_preadv, compat_sys_preadv)
#define __NR_pwritev 70
__SC_COMP(__NR_pwritev, sys_pwritev, compat_sys_pwritev)
+#define __NR_readv2 280
+__SC_COMP(__NR_readv2, sys_readv2)
+#define __NR_writev2 281
+__SC_COMP(__NR_writev2, sys_writev2)
+#define __NR_preadv2 282
+__SC_COMP(__NR_preadv2, sys_preadv2)
+#define __NR_pwritev2 283
+__SC_COMP(__NR_pwritev2, sys_pwritev2)
/* fs/sendfile.c */
#define __NR3264_sendfile 71
@@ -707,7 +715,7 @@ __SYSCALL(__NR_getrandom, sys_getrandom)
__SYSCALL(__NR_memfd_create, sys_memfd_create)
#undef __NR_syscalls
-#define __NR_syscalls 280
+#define __NR_syscalls 284
/*
* All syscalls below here should go away really,
--
1.7.9.5
--
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