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init: add an init_stat helper

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Add a simple helper to stat with a kernel space file name and switch
the early init code over to it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2020-07-22 11:15:40 +02:00
parent 5fee64fcde
commit 716308a533
4 changed files with 20 additions and 2 deletions
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3
drivers/md/md-autodetect.c
View file

@ -5,6 +5,7 @@
#include <linux/mount.h> #include <linux/mount.h>
#include <linux/major.h> #include <linux/major.h>
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/init_syscalls.h>
#include <linux/raid/detect.h> #include <linux/raid/detect.h>
#include <linux/raid/md_u.h> #include <linux/raid/md_u.h>
#include <linux/raid/md_p.h> #include <linux/raid/md_p.h>
@ -151,7 +152,7 @@ static void __init md_setup_drive(struct md_setup_args *args)
if (strncmp(devname, "/dev/", 5) == 0) if (strncmp(devname, "/dev/", 5) == 0)
devname += 5; devname += 5;
snprintf(comp_name, 63, "/dev/%s", devname); snprintf(comp_name, 63, "/dev/%s", devname);
if (vfs_stat(comp_name, &stat) == 0 && S_ISBLK(stat.mode)) if (init_stat(comp_name, &stat, 0) == 0 && S_ISBLK(stat.mode))
dev = new_decode_dev(stat.rdev); dev = new_decode_dev(stat.rdev);
if (!dev) { if (!dev) {
pr_warn("md: Unknown device name: %s\n", devname); pr_warn("md: Unknown device name: %s\n", devname);

15
fs/init.c
View file

@ -122,6 +122,21 @@ int __init init_eaccess(const char *filename)
return error; return error;
} }
int __init init_stat(const char *filename, struct kstat *stat, int flags)
{
int lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
struct path path;
int error;
error = kern_path(filename, lookup_flags, &path);
if (error)
return error;
error = vfs_getattr(&path, stat, STATX_BASIC_STATS,
flags | AT_NO_AUTOMOUNT);
path_put(&path);
return error;
}
int __init init_mknod(const char *filename, umode_t mode, unsigned int dev) int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
{ {
struct dentry *dentry; struct dentry *dentry;

1
include/linux/init_syscalls.h
View file

@ -8,6 +8,7 @@ int __init init_chroot(const char *filename);
int __init init_chown(const char *filename, uid_t user, gid_t group, int flags); int __init init_chown(const char *filename, uid_t user, gid_t group, int flags);
int __init init_chmod(const char *filename, umode_t mode); int __init init_chmod(const char *filename, umode_t mode);
int __init init_eaccess(const char *filename); int __init init_eaccess(const char *filename);
int __init init_stat(const char *filename, struct kstat *stat, int flags);
int __init init_mknod(const char *filename, umode_t mode, unsigned int dev); int __init init_mknod(const char *filename, umode_t mode, unsigned int dev);
int __init init_link(const char *oldname, const char *newname); int __init init_link(const char *oldname, const char *newname);
int __init init_symlink(const char *oldname, const char *newname); int __init init_symlink(const char *oldname, const char *newname);

3
init/initramfs.c
View file

@ -298,7 +298,8 @@ static void __init clean_path(char *path, umode_t fmode)
{ {
struct kstat st; struct kstat st;
if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) { if (init_stat(path, &st, AT_SYMLINK_NOFOLLOW) &&
(st.mode ^ fmode) & S_IFMT) {
if (S_ISDIR(st.mode)) if (S_ISDIR(st.mode))
init_rmdir(path); init_rmdir(path);
else else