dasharo/linux
0
0
Fork 0
mirror of https://github.com/Dasharo/linux.git synced 2026-03-06 15:25:10 -08:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'hch.init_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse Source 
Pull init and set_fs() cleanups from Al Viro:
 "Christoph's 'getting rid of ksys_...() uses under KERNEL_DS' series"

* 'hch.init_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (50 commits)
  init: add an init_dup helper
  init: add an init_utimes helper
  init: add an init_stat helper
  init: add an init_mknod helper
  init: add an init_mkdir helper
  init: add an init_symlink helper
  init: add an init_link helper
  init: add an init_eaccess helper
  init: add an init_chmod helper
  init: add an init_chown helper
  init: add an init_chroot helper
  init: add an init_chdir helper
  init: add an init_rmdir helper
  init: add an init_unlink helper
  init: add an init_umount helper
  init: add an init_mount helper
  init: mark create_dev as __init
  init: mark console_on_rootfs as __init
  init: initialize ramdisk_execute_command at compile time
  devtmpfs: refactor devtmpfsd()
  ...
This commit is contained in:
Linus Torvalds
2020-08-07 09:40:34 -07:00
parent 19b39c38ab f073531070
commit e1ec517e18
35 changed files with 801 additions and 773 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
init/Makefile
View File

@@ -18,7 +18,6 @@ obj-y += init_task.o
mounts-y := do_mounts.o
mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o
mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
mounts-$(CONFIG_BLK_DEV_MD) += do_mounts_md.o
# dependencies on generated files need to be listed explicitly
$(obj)/version.o: include/generated/compile.h

82
init/do_mounts.c
View File

@@ -23,12 +23,11 @@
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
#include <linux/nfs_mount.h>
#include <linux/raid/detect.h>
#include <uapi/linux/mount.h>
#include "do_mounts.h"
int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
int root_mountflags = MS_RDONLY | MS_SILENT;
static char * __initdata root_device_name;
static char __initdata saved_root_name[64];
@@ -38,7 +37,7 @@ dev_t ROOT_DEV;
static int __init load_ramdisk(char *str)
{
rd_doload = simple_strtol(str,NULL,0) & 3;
pr_warn("ignoring the deprecated load_ramdisk= option\n");
return 1;
}
__setup("load_ramdisk=", load_ramdisk);
@@ -396,20 +395,20 @@ static int __init do_mount_root(const char *name, const char *fs,
int ret;
if (data) {
/* do_mount() requires a full page as fifth argument */
/* init_mount() requires a full page as fifth argument */
p = alloc_page(GFP_KERNEL);
if (!p)
return -ENOMEM;
data_page = page_address(p);
/* zero-pad. do_mount() will make sure it's terminated */
/* zero-pad. init_mount() will make sure it's terminated */
strncpy(data_page, data, PAGE_SIZE);
}
ret = do_mount(name, "/root", fs, flags, data_page);
ret = init_mount(name, "/root", fs, flags, data_page);
if (ret)
goto out;
ksys_chdir("/root");
init_chdir("/root");
s = current->fs->pwd.dentry->d_sb;
ROOT_DEV = s->s_dev;
printk(KERN_INFO
@@ -552,66 +551,20 @@ static int __init mount_cifs_root(void)
}
#endif
#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
void __init change_floppy(char *fmt, ...)
{
struct termios termios;
char buf[80];
char c;
int fd;
va_list args;
va_start(args, fmt);
vsprintf(buf, fmt, args);
va_end(args);
fd = ksys_open("/dev/root", O_RDWR | O_NDELAY, 0);
if (fd >= 0) {
ksys_ioctl(fd, FDEJECT, 0);
ksys_close(fd);
}
printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
fd = ksys_open("/dev/console", O_RDWR, 0);
if (fd >= 0) {
ksys_ioctl(fd, TCGETS, (long)&termios);
termios.c_lflag &= ~ICANON;
ksys_ioctl(fd, TCSETSF, (long)&termios);
ksys_read(fd, &c, 1);
termios.c_lflag |= ICANON;
ksys_ioctl(fd, TCSETSF, (long)&termios);
ksys_close(fd);
}
}
#endif
void __init mount_root(void)
{
#ifdef CONFIG_ROOT_NFS
if (ROOT_DEV == Root_NFS) {
if (mount_nfs_root())
return;
printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
ROOT_DEV = Root_FD0;
if (!mount_nfs_root())
printk(KERN_ERR "VFS: Unable to mount root fs via NFS.\n");
return;
}
#endif
#ifdef CONFIG_CIFS_ROOT
if (ROOT_DEV == Root_CIFS) {
if (mount_cifs_root())
return;
printk(KERN_ERR "VFS: Unable to mount root fs via SMB, trying floppy.\n");
ROOT_DEV = Root_FD0;
}
#endif
#ifdef CONFIG_BLK_DEV_FD
if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
/* rd_doload is 2 for a dual initrd/ramload setup */
if (rd_doload==2) {
if (rd_load_disk(1)) {
ROOT_DEV = Root_RAM1;
root_device_name = NULL;
}
} else
change_floppy("root floppy");
if (!mount_cifs_root())
printk(KERN_ERR "VFS: Unable to mount root fs via SMB.\n");
return;
}
#endif
#ifdef CONFIG_BLOCK
@@ -630,8 +583,6 @@ void __init mount_root(void)
*/
void __init prepare_namespace(void)
{
int is_floppy;
if (root_delay) {
printk(KERN_INFO "Waiting %d sec before mounting root device...\n",
root_delay);
@@ -674,16 +625,11 @@ void __init prepare_namespace(void)
async_synchronize_full();
}
is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
if (is_floppy && rd_doload && rd_load_disk(0))
ROOT_DEV = Root_RAM0;
mount_root();
out:
devtmpfs_mount();
do_mount(".", "/", NULL, MS_MOVE, NULL);
ksys_chroot(".");
init_mount(".", "/", NULL, MS_MOVE, NULL);
init_chroot(".");
}
static bool is_tmpfs;

28
init/do_mounts.h
View File

@@ -8,26 +8,16 @@
#include <linux/mount.h>
#include <linux/major.h>
#include <linux/root_dev.h>
#include <linux/init_syscalls.h>
void change_floppy(char *fmt, ...);
void mount_block_root(char *name, int flags);
void mount_root(void);
extern int root_mountflags;
static inline int create_dev(char *name, dev_t dev)
static inline __init int create_dev(char *name, dev_t dev)
{
ksys_unlink(name);
return ksys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
}
static inline u32 bstat(char *name)
{
struct kstat stat;
if (vfs_stat(name, &stat) != 0)
return 0;
if (!S_ISBLK(stat.mode))
return 0;
return stat.rdev;
init_unlink(name);
return init_mknod(name, S_IFBLK | 0600, new_encode_dev(dev));
}
#ifdef CONFIG_BLK_DEV_RAM
@@ -51,13 +41,3 @@ bool __init initrd_load(void);
static inline bool initrd_load(void) { return false; }
#endif
#ifdef CONFIG_BLK_DEV_MD
void md_run_setup(void);
#else
static inline void md_run_setup(void) {}
#endif

39
init/do_mounts_initrd.c
View File

@@ -51,14 +51,14 @@ static int __init early_initrd(char *p)
}
early_param("initrd", early_initrd);
static int init_linuxrc(struct subprocess_info *info, struct cred *new)
static int __init init_linuxrc(struct subprocess_info *info, struct cred *new)
{
ksys_unshare(CLONE_FS | CLONE_FILES);
console_on_rootfs();
/* move initrd over / and chdir/chroot in initrd root */
ksys_chdir("/root");
do_mount(".", "/", NULL, MS_MOVE, NULL);
ksys_chroot(".");
init_chdir("/root");
init_mount(".", "/", NULL, MS_MOVE, NULL);
init_chroot(".");
ksys_setsid();
return 0;
}
@@ -70,12 +70,14 @@ static void __init handle_initrd(void)
extern char *envp_init[];
int error;
pr_warn("using deprecated initrd support, will be removed in 2021.\n");
real_root_dev = new_encode_dev(ROOT_DEV);
create_dev("/dev/root.old", Root_RAM0);
/* mount initrd on rootfs' /root */
mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
ksys_mkdir("/old", 0700);
ksys_chdir("/old");
init_mkdir("/old", 0700);
init_chdir("/old");
/*
* In case that a resume from disk is carried out by linuxrc or one of
@@ -92,39 +94,30 @@ static void __init handle_initrd(void)
current->flags &= ~PF_FREEZER_SKIP;
/* move initrd to rootfs' /old */
do_mount("..", ".", NULL, MS_MOVE, NULL);
init_mount("..", ".", NULL, MS_MOVE, NULL);
/* switch root and cwd back to / of rootfs */
ksys_chroot("..");
init_chroot("..");
if (new_decode_dev(real_root_dev) == Root_RAM0) {
ksys_chdir("/old");
init_chdir("/old");
return;
}
ksys_chdir("/");
init_chdir("/");
ROOT_DEV = new_decode_dev(real_root_dev);
mount_root();
printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
error = do_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
error = init_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
if (!error)
printk("okay\n");
else {
int fd = ksys_open("/dev/root.old", O_RDWR, 0);
if (error == -ENOENT)
printk("/initrd does not exist. Ignored.\n");
else
printk("failed\n");
printk(KERN_NOTICE "Unmounting old root\n");
ksys_umount("/old", MNT_DETACH);
printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
if (fd < 0) {
error = fd;
} else {
error = ksys_ioctl(fd, BLKFLSBUF, 0);
ksys_close(fd);
}
printk(!error ? "okay\n" : "failed\n");
init_umount("/old", MNT_DETACH);
}
}
@@ -139,11 +132,11 @@ bool __init initrd_load(void)
* mounted in the normal path.
*/
if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
ksys_unlink("/initrd.image");
init_unlink("/initrd.image");
handle_initrd();
return true;
}
}
ksys_unlink("/initrd.image");
init_unlink("/initrd.image");
return false;
}

304
init/do_mounts_md.c
View File

@@ -1,304 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/delay.h>
#include <linux/raid/md_u.h>
#include <linux/raid/md_p.h>
#include "do_mounts.h"
/*
* When md (and any require personalities) are compiled into the kernel
* (not a module), arrays can be assembles are boot time using with AUTODETECT
* where specially marked partitions are registered with md_autodetect_dev(),
* and with MD_BOOT where devices to be collected are given on the boot line
* with md=.....
* The code for that is here.
*/
#ifdef CONFIG_MD_AUTODETECT
static int __initdata raid_noautodetect;
#else
static int __initdata raid_noautodetect=1;
#endif
static int __initdata raid_autopart;
static struct {
int minor;
int partitioned;
int level;
int chunk;
char *device_names;
} md_setup_args[256] __initdata;
static int md_setup_ents __initdata;
/*
* Parse the command-line parameters given our kernel, but do not
* actually try to invoke the MD device now; that is handled by
* md_setup_drive after the low-level disk drivers have initialised.
*
* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
* assigns the task of parsing integer arguments to the
* invoked program now). Added ability to initialise all
* the MD devices (by specifying multiple "md=" lines)
* instead of just one. -- KTK
* 18May2000: Added support for persistent-superblock arrays:
* md=n,0,factor,fault,device-list uses RAID0 for device n
* md=n,-1,factor,fault,device-list uses LINEAR for device n
* md=n,device-list reads a RAID superblock from the devices
* elements in device-list are read by name_to_kdev_t so can be
* a hex number or something like /dev/hda1 /dev/sdb
* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
* Shifted name_to_kdev_t() and related operations to md_set_drive()
* for later execution. Rewrote section to make devfs compatible.
*/
static int __init md_setup(char *str)
{
int minor, level, factor, fault, partitioned = 0;
char *pername = "";
char *str1;
int ent;
if (*str == 'd') {
partitioned = 1;
str++;
}
if (get_option(&str, &minor) != 2) { /* MD Number */
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
str1 = str;
for (ent=0 ; ent< md_setup_ents ; ent++)
if (md_setup_args[ent].minor == minor &&
md_setup_args[ent].partitioned == partitioned) {
printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
"Replacing previous definition.\n", partitioned?"d":"", minor);
break;
}
if (ent >= ARRAY_SIZE(md_setup_args)) {
printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
return 0;
}
if (ent >= md_setup_ents)
md_setup_ents++;
switch (get_option(&str, &level)) { /* RAID level */
case 2: /* could be 0 or -1.. */
if (level == 0 || level == LEVEL_LINEAR) {
if (get_option(&str, &factor) != 2 || /* Chunk Size */
get_option(&str, &fault) != 2) {
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
md_setup_args[ent].level = level;
md_setup_args[ent].chunk = 1 << (factor+12);
if (level == LEVEL_LINEAR)
pername = "linear";
else
pername = "raid0";
break;
}
/* FALL THROUGH */
case 1: /* the first device is numeric */
str = str1;
/* FALL THROUGH */
case 0:
md_setup_args[ent].level = LEVEL_NONE;
pername="super-block";
}
printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
minor, pername, str);
md_setup_args[ent].device_names = str;
md_setup_args[ent].partitioned = partitioned;
md_setup_args[ent].minor = minor;
return 1;
}
static void __init md_setup_drive(void)
{
int minor, i, ent, partitioned;
dev_t dev;
dev_t devices[MD_SB_DISKS+1];
for (ent = 0; ent < md_setup_ents ; ent++) {
int fd;
int err = 0;
char *devname;
mdu_disk_info_t dinfo;
char name[16];
minor = md_setup_args[ent].minor;
partitioned = md_setup_args[ent].partitioned;
devname = md_setup_args[ent].device_names;
sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
if (partitioned)
dev = MKDEV(mdp_major, minor << MdpMinorShift);
else
dev = MKDEV(MD_MAJOR, minor);
create_dev(name, dev);
for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
char *p;
char comp_name[64];
u32 rdev;
p = strchr(devname, ',');
if (p)
*p++ = 0;
dev = name_to_dev_t(devname);
if (strncmp(devname, "/dev/", 5) == 0)
devname += 5;
snprintf(comp_name, 63, "/dev/%s", devname);
rdev = bstat(comp_name);
if (rdev)
dev = new_decode_dev(rdev);
if (!dev) {
printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
break;
}
devices[i] = dev;
devname = p;
}
devices[i] = 0;
if (!i)
continue;
printk(KERN_INFO "md: Loading md%s%d: %s\n",
partitioned ? "_d" : "", minor,
md_setup_args[ent].device_names);
fd = ksys_open(name, 0, 0);
if (fd < 0) {
printk(KERN_ERR "md: open failed - cannot start "
"array %s\n", name);
continue;
}
if (ksys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
printk(KERN_WARNING
"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
minor);
ksys_close(fd);
continue;
}
if (md_setup_args[ent].level != LEVEL_NONE) {
/* non-persistent */
mdu_array_info_t ainfo;
ainfo.level = md_setup_args[ent].level;
ainfo.size = 0;
ainfo.nr_disks =0;
ainfo.raid_disks =0;
while (devices[ainfo.raid_disks])
ainfo.raid_disks++;
ainfo.md_minor =minor;
ainfo.not_persistent = 1;
ainfo.state = (1 << MD_SB_CLEAN);
ainfo.layout = 0;
ainfo.chunk_size = md_setup_args[ent].chunk;
err = ksys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
for (i = 0; !err && i <= MD_SB_DISKS; i++) {
dev = devices[i];
if (!dev)
break;
dinfo.number = i;
dinfo.raid_disk = i;
dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
dinfo.major = MAJOR(dev);
dinfo.minor = MINOR(dev);
err = ksys_ioctl(fd, ADD_NEW_DISK,
(long)&dinfo);
}
} else {
/* persistent */
for (i = 0; i <= MD_SB_DISKS; i++) {
dev = devices[i];
if (!dev)
break;
dinfo.major = MAJOR(dev);
dinfo.minor = MINOR(dev);
ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
}
}
if (!err)
err = ksys_ioctl(fd, RUN_ARRAY, 0);
if (err)
printk(KERN_WARNING "md: starting md%d failed\n", minor);
else {
/* reread the partition table.
* I (neilb) and not sure why this is needed, but I cannot
* boot a kernel with devfs compiled in from partitioned md
* array without it
*/
ksys_close(fd);
fd = ksys_open(name, 0, 0);
ksys_ioctl(fd, BLKRRPART, 0);
}
ksys_close(fd);
}
}
static int __init raid_setup(char *str)
{
int len, pos;
len = strlen(str) + 1;
pos = 0;
while (pos < len) {
char *comma = strchr(str+pos, ',');
int wlen;
if (comma)
wlen = (comma-str)-pos;
else wlen = (len-1)-pos;
if (!strncmp(str, "noautodetect", wlen))
raid_noautodetect = 1;
if (!strncmp(str, "autodetect", wlen))
raid_noautodetect = 0;
if (strncmp(str, "partitionable", wlen)==0)
raid_autopart = 1;
if (strncmp(str, "part", wlen)==0)
raid_autopart = 1;
pos += wlen+1;
}
return 1;
}
__setup("raid=", raid_setup);
__setup("md=", md_setup);
static void __init autodetect_raid(void)
{
int fd;
/*
* Since we don't want to detect and use half a raid array, we need to
* wait for the known devices to complete their probing
*/
printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
wait_for_device_probe();
fd = ksys_open("/dev/md0", 0, 0);
if (fd >= 0) {
ksys_ioctl(fd, RAID_AUTORUN, raid_autopart);
ksys_close(fd);
}
}
void __init md_run_setup(void)
{
create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
if (raid_noautodetect)
printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
else
autodetect_raid();
md_setup_drive();
}

101
init/do_mounts_rd.c
View File

@@ -14,12 +14,12 @@
#include <linux/decompress/generic.h>
int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */
static struct file *in_file, *out_file;
static loff_t in_pos, out_pos;
static int __init prompt_ramdisk(char *str)
{
rd_prompt = simple_strtol(str,NULL,0) & 1;
pr_warn("ignoring the deprecated prompt_ramdisk= option\n");
return 1;
}
__setup("prompt_ramdisk=", prompt_ramdisk);
@@ -33,7 +33,7 @@ static int __init ramdisk_start_setup(char *str)
}
__setup("ramdisk_start=", ramdisk_start_setup);
static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
static int __init crd_load(decompress_fn deco);
/*
* This routine tries to find a RAM disk image to load, and returns the
@@ -55,7 +55,8 @@ static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
* lz4
*/
static int __init
identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
identify_ramdisk_image(struct file *file, loff_t pos,
decompress_fn *decompressor)
{
const int size = 512;
struct minix_super_block *minixsb;
@@ -66,6 +67,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
unsigned char *buf;
const char *compress_name;
unsigned long n;
int start_block = rd_image_start;
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
@@ -80,8 +82,8 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
/*
* Read block 0 to test for compressed kernel
*/
ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
ksys_read(fd, buf, size);
pos = start_block * BLOCK_SIZE;
kernel_read(file, buf, size, &pos);
*decompressor = decompress_method(buf, size, &compress_name);
if (compress_name) {
@@ -126,8 +128,8 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
/*
* Read 512 bytes further to check if cramfs is padded
*/
ksys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
ksys_read(fd, buf, size);
pos = start_block * BLOCK_SIZE + 0x200;
kernel_read(file, buf, size, &pos);
if (cramfsb->magic == CRAMFS_MAGIC) {
printk(KERN_NOTICE
@@ -140,8 +142,8 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
/*
* Read block 1 to test for minix and ext2 superblock
*/
ksys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
ksys_read(fd, buf, size);
pos = (start_block + 1) * BLOCK_SIZE;
kernel_read(file, buf, size, &pos);
/* Try minix */
if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
@@ -168,17 +170,24 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
start_block);
done:
ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
kfree(buf);
return nblocks;
}
static unsigned long nr_blocks(struct file *file)
{
struct inode *inode = file->f_mapping->host;
if (!S_ISBLK(inode->i_mode))
return 0;
return i_size_read(inode) >> 10;
}
int __init rd_load_image(char *from)
{
int res = 0;
int in_fd, out_fd;
unsigned long rd_blocks, devblocks;
int nblocks, i, disk;
int nblocks, i;
char *buf = NULL;
unsigned short rotate = 0;
decompress_fn decompressor = NULL;
@@ -186,20 +195,21 @@ int __init rd_load_image(char *from)
char rotator[4] = { '|' , '/' , '-' , '\\' };
#endif
out_fd = ksys_open("/dev/ram", O_RDWR, 0);
if (out_fd < 0)
out_file = filp_open("/dev/ram", O_RDWR, 0);
if (IS_ERR(out_file))
goto out;
in_fd = ksys_open(from, O_RDONLY, 0);
if (in_fd < 0)
in_file = filp_open(from, O_RDONLY, 0);
if (IS_ERR(in_file))
goto noclose_input;
nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
in_pos = rd_image_start * BLOCK_SIZE;
nblocks = identify_ramdisk_image(in_file, in_pos, &decompressor);
if (nblocks < 0)
goto done;
if (nblocks == 0) {
if (crd_load(in_fd, out_fd, decompressor) == 0)
if (crd_load(decompressor) == 0)
goto successful_load;
goto done;
}
@@ -208,11 +218,7 @@ int __init rd_load_image(char *from)
* NOTE NOTE: nblocks is not actually blocks but
* the number of kibibytes of data to load into a ramdisk.
*/
if (ksys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
rd_blocks = 0;
else
rd_blocks >>= 1;
rd_blocks = nr_blocks(out_file);
if (nblocks > rd_blocks) {
printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
nblocks, rd_blocks);
@@ -222,13 +228,10 @@ int __init rd_load_image(char *from)
/*
* OK, time to copy in the data
*/
if (ksys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
devblocks = 0;
else
devblocks >>= 1;
if (strcmp(from, "/initrd.image") == 0)
devblocks = nblocks;
else
devblocks = nr_blocks(in_file);
if (devblocks == 0) {
printk(KERN_ERR "RAMDISK: could not determine device size\n");
@@ -243,24 +246,15 @@ int __init rd_load_image(char *from)
printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
for (i = 0, disk = 1; i < nblocks; i++) {
for (i = 0; i < nblocks; i++) {
if (i && (i % devblocks == 0)) {
pr_cont("done disk #%d.\n", disk++);
pr_cont("done disk #1.\n");
rotate = 0;
if (ksys_close(in_fd)) {
printk("Error closing the disk.\n");
goto noclose_input;
}
change_floppy("disk #%d", disk);
in_fd = ksys_open(from, O_RDONLY, 0);
if (in_fd < 0) {
printk("Error opening disk.\n");
goto noclose_input;
}
printk("Loading disk #%d... ", disk);
fput(in_file);
break;
}
ksys_read(in_fd, buf, BLOCK_SIZE);
ksys_write(out_fd, buf, BLOCK_SIZE);
kernel_read(in_file, buf, BLOCK_SIZE, &in_pos);
kernel_write(out_file, buf, BLOCK_SIZE, &out_pos);
#if !defined(CONFIG_S390)
if (!(i % 16)) {
pr_cont("%c\b", rotator[rotate & 0x3]);
@@ -273,19 +267,17 @@ int __init rd_load_image(char *from)
successful_load:
res = 1;
done:
ksys_close(in_fd);
fput(in_file);
noclose_input:
ksys_close(out_fd);
fput(out_file);
out:
kfree(buf);
ksys_unlink("/dev/ram");
init_unlink("/dev/ram");
return res;
}
int __init rd_load_disk(int n)
{
if (rd_prompt)
change_floppy("root floppy disk to be loaded into RAM disk");
create_dev("/dev/root", ROOT_DEV);
create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
return rd_load_image("/dev/root");
@@ -293,11 +285,10 @@ int __init rd_load_disk(int n)
static int exit_code;
static int decompress_error;
static int crd_infd, crd_outfd;
static long __init compr_fill(void *buf, unsigned long len)
{
long r = ksys_read(crd_infd, buf, len);
long r = kernel_read(in_file, buf, len, &in_pos);
if (r < 0)
printk(KERN_ERR "RAMDISK: error while reading compressed data");
else if (r == 0)
@@ -307,7 +298,7 @@ static long __init compr_fill(void *buf, unsigned long len)
static long __init compr_flush(void *window, unsigned long outcnt)
{
long written = ksys_write(crd_outfd, window, outcnt);
long written = kernel_write(out_file, window, outcnt, &out_pos);
if (written != outcnt) {
if (decompress_error == 0)
printk(KERN_ERR
@@ -326,11 +317,9 @@ static void __init error(char *x)
decompress_error = 1;
}
static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
static int __init crd_load(decompress_fn deco)
{
int result;
crd_infd = in_fd;
crd_outfd = out_fd;
if (!deco) {
pr_emerg("Invalid ramdisk decompression routine. "

146
init/initramfs.c
View File

@@ -11,14 +11,17 @@
#include <linux/utime.h>
#include <linux/file.h>
#include <linux/memblock.h>
#include <linux/namei.h>
#include <linux/init_syscalls.h>
static ssize_t __init xwrite(int fd, const char *p, size_t count)
static ssize_t __init xwrite(struct file *file, const char *p, size_t count,
loff_t *pos)
{
ssize_t out = 0;
/* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
while (count) {
ssize_t rv = ksys_write(fd, p, count);
ssize_t rv = kernel_write(file, p, count, pos);
if (rv < 0) {
if (rv == -EINTR || rv == -EAGAIN)
@@ -108,8 +111,7 @@ static long __init do_utime(char *filename, time64_t mtime)
t[0].tv_nsec = 0;
t[1].tv_sec = mtime;
t[1].tv_nsec = 0;
return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
return init_utimes(filename, t);
}
static __initdata LIST_HEAD(dir_list);
@@ -200,7 +202,6 @@ static inline void __init eat(unsigned n)
byte_count -= n;
}
static __initdata char *vcollected;
static __initdata char *collected;
static long remains __initdata;
static __initdata char *collect;
@@ -296,11 +297,12 @@ static void __init clean_path(char *path, umode_t fmode)
{
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))
ksys_rmdir(path);
init_rmdir(path);
else
ksys_unlink(path);
init_unlink(path);
}
}
@@ -310,13 +312,14 @@ static int __init maybe_link(void)
char *old = find_link(major, minor, ino, mode, collected);
if (old) {
clean_path(collected, 0);
return (ksys_link(old, collected) < 0) ? -1 : 1;
return (init_link(old, collected) < 0) ? -1 : 1;
}
}
return 0;
}
static __initdata int wfd;
static __initdata struct file *wfile;
static __initdata loff_t wfile_pos;
static int __init do_name(void)
{
@@ -333,28 +336,28 @@ static int __init do_name(void)
int openflags = O_WRONLY|O_CREAT;
if (ml != 1)
openflags |= O_TRUNC;
wfd = ksys_open(collected, openflags, mode);
wfile = filp_open(collected, openflags, mode);
if (IS_ERR(wfile))
return 0;
wfile_pos = 0;
if (wfd >= 0) {
ksys_fchown(wfd, uid, gid);
ksys_fchmod(wfd, mode);
if (body_len)
ksys_ftruncate(wfd, body_len);
vcollected = kstrdup(collected, GFP_KERNEL);
state = CopyFile;
}
vfs_fchown(wfile, uid, gid);
vfs_fchmod(wfile, mode);
if (body_len)
vfs_truncate(&wfile->f_path, body_len);
state = CopyFile;
}
} else if (S_ISDIR(mode)) {
ksys_mkdir(collected, mode);
ksys_chown(collected, uid, gid);
ksys_chmod(collected, mode);
init_mkdir(collected, mode);
init_chown(collected, uid, gid, 0);
init_chmod(collected, mode);
dir_add(collected, mtime);
} else if (S_ISBLK(mode) || S_ISCHR(mode) ||
S_ISFIFO(mode) || S_ISSOCK(mode)) {
if (maybe_link() == 0) {
ksys_mknod(collected, mode, rdev);
ksys_chown(collected, uid, gid);
ksys_chmod(collected, mode);
init_mknod(collected, mode, rdev);
init_chown(collected, uid, gid, 0);
init_chmod(collected, mode);
do_utime(collected, mtime);
}
}
@@ -364,16 +367,20 @@ static int __init do_name(void)
static int __init do_copy(void)
{
if (byte_count >= body_len) {
if (xwrite(wfd, victim, body_len) != body_len)
struct timespec64 t[2] = { };
if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len)
error("write error");
ksys_close(wfd);
do_utime(vcollected, mtime);
kfree(vcollected);
t[0].tv_sec = mtime;
t[1].tv_sec = mtime;
vfs_utimes(&wfile->f_path, t);
fput(wfile);
eat(body_len);
state = SkipIt;
return 0;
} else {
if (xwrite(wfd, victim, byte_count) != byte_count)
if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count)
error("write error");
body_len -= byte_count;
eat(byte_count);
@@ -385,8 +392,8 @@ static int __init do_symlink(void)
{
collected[N_ALIGN(name_len) + body_len] = '\0';
clean_path(collected, 0);
ksys_symlink(collected + N_ALIGN(name_len), collected);
ksys_lchown(collected, uid, gid);
init_symlink(collected + N_ALIGN(name_len), collected);
init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW);
do_utime(collected, mtime);
state = SkipIt;
next_state = Reset;
@@ -571,83 +578,27 @@ static inline bool kexec_free_initrd(void)
}
#endif /* CONFIG_KEXEC_CORE */
#ifdef CONFIG_BLK_DEV_RAM
#define BUF_SIZE 1024
static void __init clean_rootfs(void)
{
int fd;
void *buf;
struct linux_dirent64 *dirp;
int num;
fd = ksys_open("/", O_RDONLY, 0);
WARN_ON(fd < 0);
if (fd < 0)
return;
buf = kzalloc(BUF_SIZE, GFP_KERNEL);
WARN_ON(!buf);
if (!buf) {
ksys_close(fd);
return;
}
dirp = buf;
num = ksys_getdents64(fd, dirp, BUF_SIZE);
while (num > 0) {
while (num > 0) {
struct kstat st;
int ret;
ret = vfs_lstat(dirp->d_name, &st);
WARN_ON_ONCE(ret);
if (!ret) {
if (S_ISDIR(st.mode))
ksys_rmdir(dirp->d_name);
else
ksys_unlink(dirp->d_name);
}
num -= dirp->d_reclen;
dirp = (void *)dirp + dirp->d_reclen;
}
dirp = buf;
memset(buf, 0, BUF_SIZE);
num = ksys_getdents64(fd, dirp, BUF_SIZE);
}
ksys_close(fd);
kfree(buf);
}
#else
static inline void clean_rootfs(void)
{
}
#endif /* CONFIG_BLK_DEV_RAM */
#ifdef CONFIG_BLK_DEV_RAM
static void __init populate_initrd_image(char *err)
{
ssize_t written;
int fd;
struct file *file;
loff_t pos = 0;
unpack_to_rootfs(__initramfs_start, __initramfs_size);
printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n",
err);
fd = ksys_open("/initrd.image", O_WRONLY | O_CREAT, 0700);
if (fd < 0)
file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700);
if (IS_ERR(file))
return;
written = xwrite(fd, (char *)initrd_start, initrd_end - initrd_start);
written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start,
&pos);
if (written != initrd_end - initrd_start)
pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
written, initrd_end - initrd_start);
ksys_close(fd);
}
#else
static void __init populate_initrd_image(char *err)
{
printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
fput(file);
}
#endif /* CONFIG_BLK_DEV_RAM */
@@ -668,8 +619,11 @@ static int __init populate_rootfs(void)
err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start);
if (err) {
clean_rootfs();
#ifdef CONFIG_BLK_DEV_RAM
populate_initrd_image(err);
#else
printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
#endif
}
done:

28
init/main.c
View File

@@ -96,6 +96,7 @@
#include <linux/jump_label.h>
#include <linux/mem_encrypt.h>
#include <linux/kcsan.h>
#include <linux/init_syscalls.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -154,7 +155,7 @@ static bool initargs_found;
#endif
static char *execute_command;
static char *ramdisk_execute_command;
static char *ramdisk_execute_command = "/init";
/*
* Used to generate warnings if static_key manipulation functions are used
@@ -1457,15 +1458,19 @@ static int __ref kernel_init(void *unused)
"See Linux Documentation/admin-guide/init.rst for guidance.");
}
void console_on_rootfs(void)
/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
void __init console_on_rootfs(void)
{
/* Open the /dev/console as stdin, this should never fail */
if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
pr_err("Warning: unable to open an initial console.\n");
struct file *file = filp_open("/dev/console", O_RDWR, 0);
/* create stdout/stderr */
(void) ksys_dup(0);
(void) ksys_dup(0);
if (IS_ERR(file)) {
pr_err("Warning: unable to open an initial console.\n");
return;
}
init_dup(file);
init_dup(file);
init_dup(file);
fput(file);
}
static noinline void __init kernel_init_freeable(void)
@@ -1510,12 +1515,7 @@ static noinline void __init kernel_init_freeable(void)
* check if there is an early userspace init. If yes, let it do all
* the work
*/
if (!ramdisk_execute_command)
ramdisk_execute_command = "/init";
if (ksys_access((const char __user *)
ramdisk_execute_command, 0) != 0) {
if (init_eaccess(ramdisk_execute_command) != 0) {
ramdisk_execute_command = NULL;
prepare_namespace();
}

8
init/noinitramfs.c
View File

@@ -9,6 +9,7 @@
#include <linux/stat.h>
#include <linux/kdev_t.h>
#include <linux/syscalls.h>
#include <linux/init_syscalls.h>
/*
* Create a simple rootfs that is similar to the default initramfs
@@ -17,17 +18,16 @@ static int __init default_rootfs(void)
{
int err;
err = ksys_mkdir((const char __user __force *) "/dev", 0755);
err = init_mkdir("/dev", 0755);
if (err < 0)
goto out;
err = ksys_mknod((const char __user __force *) "/dev/console",
S_IFCHR | S_IRUSR | S_IWUSR,
err = init_mknod("/dev/console", S_IFCHR | S_IRUSR | S_IWUSR,
new_encode_dev(MKDEV(5, 1)));
if (err < 0)
goto out;
err = ksys_mkdir((const char __user __force *) "/root", 0700);
err = init_mkdir("/root", 0700);
if (err < 0)
goto out;