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

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()
  ...

9 files changed, 148 insertions, 591 deletions

diff --git a/init/Makefile b/init/Makefile
index 57499b1ff471..6bc37f64b361 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -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
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 29d326b6c29d..b5f9604d0c98 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -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;
diff --git a/init/do_mounts.h b/init/do_mounts.h
index 0bb0806de4ce..7a29ac3e427b 100644
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -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
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 53314d7da4be..533d81ed74d4 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -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;
 }
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
deleted file mode 100644
index b84031528dd4..000000000000
--- a/init/do_mounts_md.c
+++ /dev/null
@@ -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();
-}
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 32fb049d18f9..ac021ae6e6fa 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -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.  "
diff --git a/init/initramfs.c b/init/initramfs.c
index 7a38012e1af7..e6dbfb767057 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -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);
-
-			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;
-			}
+			wfile = filp_open(collected, openflags, mode);
+			if (IS_ERR(wfile))
+				return 0;
+			wfile_pos = 0;
+
+			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;
@@ -572,82 +579,26 @@ 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:
diff --git a/init/main.c b/init/main.c
index 15bd0efff3df..276ca3160c8c 100644
--- a/init/main.c
+++ b/init/main.c
@@ -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();
 	}
diff --git a/init/noinitramfs.c b/init/noinitramfs.c
index fa9cdfa7101d..3d62b07f3bb9 100644
--- a/init/noinitramfs.c
+++ b/init/noinitramfs.c
@@ -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;