The patch titled
Subject: initramfs: use vfs_stat/lstat directly
has been added to the -mm tree. Its filename is
initramfs-use-vfs_stat-lstat-directly.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/initramfs-use-vfs_stat-lstat-directly.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/initramfs-use-vfs_stat-lstat-directly.patch
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------------------------------------------------------
From: Arnd Bergmann <arnd@xxxxxxxx>
Subject: 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@xxxxxxxx
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
init/do_mounts.h | 22 ++++------------------
init/initramfs.c | 12 ++++++------
2 files changed, 10 insertions(+), 24 deletions(-)
diff -puN init/do_mounts.h~initramfs-use-vfs_stat-lstat-directly init/do_mounts.h
--- a/init/do_mounts.h~initramfs-use-vfs_stat-lstat-directly
+++ a/init/do_mounts.h
@@ -19,29 +19,15 @@ static inline int create_dev(char *name,
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;
-}
-#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;
+ return stat.rdev;
}
-#endif
#ifdef CONFIG_BLK_DEV_RAM
diff -puN init/initramfs.c~initramfs-use-vfs_stat-lstat-directly init/initramfs.c
--- a/init/initramfs.c~initramfs-use-vfs_stat-lstat-directly
+++ a/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);
_
Patches currently in -mm which might be from arnd@xxxxxxxx are
mm-x86-fix-native_pud_clear-build-error.patch
initramfs-use-vfs_stat-lstat-directly.patch
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