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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 13:34:54 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:16:00 +0300
commit411d9475cf901b5a6d2996b46cb5726184a4fa50 (patch)
tree9edd781b00784cd4f178e44d684c5ab4092cd551 /include/linux/syscalls.h
parent55731b3cda3a85ee888dac3bf1f36489f275c187 (diff)
downloadlinux-411d9475cf901b5a6d2996b46cb5726184a4fa50.tar.xz
fs: add ksys_ftruncate() wrapper; remove in-kernel calls to sys_ftruncate()
Using the ksys_ftruncate() wrapper allows us to get rid of in-kernel calls to the sys_ftruncate() 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_ftruncate(). 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 'include/linux/syscalls.h')
-rw-r--r--include/linux/syscalls.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index df0d1e818a6e..41023177c8ec 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1038,4 +1038,11 @@ static inline long ksys_lchown(const char __user *filename, uid_t user,
AT_SYMLINK_NOFOLLOW);
}
+extern long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
+
+static inline long ksys_ftruncate(unsigned int fd, unsigned long length)
+{
+ return do_sys_ftruncate(fd, length, 1);
+}
+
#endif