initramfs: use vfs_stat/lstat directly
sys_newlstat is a system call implementation that is meant for user
space, and that copies kernel-internal data structure to the user
format, which is not needed for in-kernel users.
Further, as we rearrange the system call implementation so we can extend
it with 64-bit time_t, the prototype for sys_newlstat changes.
This changes the initramfs code to use vfs_lstat directly, to get it out
of the way of the time_t changes, and make it slightly more efficient in
the process. Along the same lines we also replace sys_stat and
sys_stat64 with vfs_stat.
Link: http://lkml.kernel.org/r/20170314214932.4052842-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/init/do_mounts.h b/init/do_mounts.h
index 067af1d..282d65b 100644
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -19,29 +19,15 @@ static inline int create_dev(char *name, dev_t dev)
return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
}
-#if BITS_PER_LONG == 32
static inline u32 bstat(char *name)
{
- struct stat64 stat;
- if (sys_stat64(name, &stat) != 0)
+ struct kstat stat;
+ if (vfs_stat(name, &stat) != 0)
return 0;
- if (!S_ISBLK(stat.st_mode))
+ if (!S_ISBLK(stat.mode))
return 0;
- if (stat.st_rdev != (u32)stat.st_rdev)
- return 0;
- return stat.st_rdev;
+ return stat.rdev;
}
-#else
-static inline u32 bstat(char *name)
-{
- struct stat stat;
- if (sys_newstat(name, &stat) != 0)
- return 0;
- if (!S_ISBLK(stat.st_mode))
- return 0;
- return stat.st_rdev;
-}
-#endif
#ifdef CONFIG_BLK_DEV_RAM
diff --git a/init/initramfs.c b/init/initramfs.c
index 9d18027..8a53205 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -312,10 +312,10 @@ static int __init maybe_link(void)
static void __init clean_path(char *path, umode_t fmode)
{
- struct stat st;
+ struct kstat st;
- if (!sys_newlstat(path, &st) && (st.st_mode ^ fmode) & S_IFMT) {
- if (S_ISDIR(st.st_mode))
+ if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) {
+ if (S_ISDIR(st.mode))
sys_rmdir(path);
else
sys_unlink(path);
@@ -581,13 +581,13 @@ static void __init clean_rootfs(void)
num = sys_getdents64(fd, dirp, BUF_SIZE);
while (num > 0) {
while (num > 0) {
- struct stat st;
+ struct kstat st;
int ret;
- ret = sys_newlstat(dirp->d_name, &st);
+ ret = vfs_lstat(dirp->d_name, &st);
WARN_ON_ONCE(ret);
if (!ret) {
- if (S_ISDIR(st.st_mode))
+ if (S_ISDIR(st.mode))
sys_rmdir(dirp->d_name);
else
sys_unlink(dirp->d_name);
