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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 13:34:40 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:15:49 +0300
commitc7248321a3d42ffba78db0dde88d1c49ca1c045f (patch)
treeecd2b86a077f764e200b3c214cd1f851d4e3c6e0 /fs/file.c
parent3a18ef5c1b3935cb05888fc37964321f7bd6231d (diff)
downloadlinux-c7248321a3d42ffba78db0dde88d1c49ca1c045f.tar.xz
fs: add ksys_dup{,3}() helper; remove in-kernel calls to sys_dup{,3}()
Using ksys_dup() and ksys_dup3() as helper functions allows us to avoid the in-kernel calls to the sys_dup() and sys_dup3() syscalls. The ksys_ prefix denotes that these functions are meant as a drop-in replacement for the syscalls. In particular, they use the same calling convention as sys_dup{,3}(). In the near future, the fs-external callers of ksys_dup{,3}() should be converted to call do_dup2() directly. Then, ksys_dup{,3}() can be moved within sys_dup{,3}() again. This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'fs/file.c')
-rw-r--r--fs/file.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/file.c b/fs/file.c
index 42f0db4bd0fb..d304004f0b65 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -870,7 +870,7 @@ out_unlock:
return err;
}
-SYSCALL_DEFINE3(dup3, unsigned int, oldfd, unsigned int, newfd, int, flags)
+static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
{
int err = -EBADF;
struct file *file;
@@ -904,6 +904,11 @@ out_unlock:
return err;
}
+SYSCALL_DEFINE3(dup3, unsigned int, oldfd, unsigned int, newfd, int, flags)
+{
+ return ksys_dup3(oldfd, newfd, flags);
+}
+
SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd)
{
if (unlikely(newfd == oldfd)) { /* corner case */
@@ -916,10 +921,10 @@ SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd)
rcu_read_unlock();
return retval;
}
- return sys_dup3(oldfd, newfd, 0);
+ return ksys_dup3(oldfd, newfd, 0);
}
-SYSCALL_DEFINE1(dup, unsigned int, fildes)
+int ksys_dup(unsigned int fildes)
{
int ret = -EBADF;
struct file *file = fget_raw(fildes);
@@ -934,6 +939,11 @@ SYSCALL_DEFINE1(dup, unsigned int, fildes)
return ret;
}
+SYSCALL_DEFINE1(dup, unsigned int, fildes)
+{
+ return ksys_dup(fildes);
+}
+
int f_dupfd(unsigned int from, struct file *file, unsigned flags)
{
int err;