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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 11:34:46 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:51 +0200
commit447016e9681965fda8dcd9e4fd3c55308a6fd166 (patch)
tree02db8c01fa405f0f16ba09bbee415cdf15e30b14 /fs/open.c
parente7a3e8b2edf544ec28f689385c3adc2903f46ec0 (diff)
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fs: add ksys_chdir() helper; remove in-kernel calls to sys_chdir()
Using this helper allows us to avoid the in-kernel calls to the sys_chdir() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_chdir(). 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: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/open.c b/fs/open.c
index 7a475e8a2e41..a19b8277c439 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -431,7 +431,7 @@ SYSCALL_DEFINE2(access, const char __user *, filename, int, mode)
return sys_faccessat(AT_FDCWD, filename, mode);
}
-SYSCALL_DEFINE1(chdir, const char __user *, filename)
+int ksys_chdir(const char __user *filename)
{
struct path path;
int error;
@@ -457,6 +457,11 @@ out:
return error;
}
+SYSCALL_DEFINE1(chdir, const char __user *, filename)
+{
+ return ksys_chdir(filename);
+}
+
SYSCALL_DEFINE1(fchdir, unsigned int, fd)
{
struct fd f = fdget_raw(fd);