a1ce35fa49
This removes a bunch of core and elevator related code. On the core front, we remove anything related to queue running, draining, initialization, plugging, and congestions. We also kill anything related to request allocation, merging, retrieval, and completion. Remove any checking for single queue IO schedulers, as they no longer exist. This means we can also delete a bunch of code related to request issue, adding, completion, etc - and all the SQ related ops and helpers. Also kill the load_default_modules(), as all that did was provide for a way to load the default single queue elevator. Tested-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/unistd.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/minix_fs.h>
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#include <linux/romfs_fs.h>
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#include <linux/initrd.h>
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#include <linux/sched.h>
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#include <linux/freezer.h>
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#include <linux/kmod.h>
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#include "do_mounts.h"
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unsigned long initrd_start, initrd_end;
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int initrd_below_start_ok;
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unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
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static int __initdata mount_initrd = 1;
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static int __init no_initrd(char *str)
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{
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mount_initrd = 0;
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return 1;
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}
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__setup("noinitrd", no_initrd);
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static int init_linuxrc(struct subprocess_info *info, struct cred *new)
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{
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ksys_unshare(CLONE_FS | CLONE_FILES);
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/* stdin/stdout/stderr for /linuxrc */
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ksys_open("/dev/console", O_RDWR, 0);
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ksys_dup(0);
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ksys_dup(0);
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/* move initrd over / and chdir/chroot in initrd root */
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ksys_chdir("/root");
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ksys_mount(".", "/", NULL, MS_MOVE, NULL);
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ksys_chroot(".");
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ksys_setsid();
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return 0;
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}
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static void __init handle_initrd(void)
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{
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struct subprocess_info *info;
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static char *argv[] = { "linuxrc", NULL, };
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extern char *envp_init[];
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int error;
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real_root_dev = new_encode_dev(ROOT_DEV);
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create_dev("/dev/root.old", Root_RAM0);
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/* mount initrd on rootfs' /root */
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mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
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ksys_mkdir("/old", 0700);
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ksys_chdir("/old");
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/*
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* In case that a resume from disk is carried out by linuxrc or one of
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* its children, we need to tell the freezer not to wait for us.
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*/
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current->flags |= PF_FREEZER_SKIP;
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info = call_usermodehelper_setup("/linuxrc", argv, envp_init,
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GFP_KERNEL, init_linuxrc, NULL, NULL);
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if (!info)
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return;
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call_usermodehelper_exec(info, UMH_WAIT_PROC);
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current->flags &= ~PF_FREEZER_SKIP;
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/* move initrd to rootfs' /old */
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ksys_mount("..", ".", NULL, MS_MOVE, NULL);
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/* switch root and cwd back to / of rootfs */
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ksys_chroot("..");
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if (new_decode_dev(real_root_dev) == Root_RAM0) {
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ksys_chdir("/old");
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return;
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}
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ksys_chdir("/");
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ROOT_DEV = new_decode_dev(real_root_dev);
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mount_root();
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printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
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error = ksys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
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if (!error)
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printk("okay\n");
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else {
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int fd = ksys_open("/dev/root.old", O_RDWR, 0);
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if (error == -ENOENT)
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printk("/initrd does not exist. Ignored.\n");
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else
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printk("failed\n");
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printk(KERN_NOTICE "Unmounting old root\n");
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ksys_umount("/old", MNT_DETACH);
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printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
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if (fd < 0) {
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error = fd;
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} else {
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error = ksys_ioctl(fd, BLKFLSBUF, 0);
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ksys_close(fd);
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}
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printk(!error ? "okay\n" : "failed\n");
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}
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}
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bool __init initrd_load(void)
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{
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if (mount_initrd) {
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create_dev("/dev/ram", Root_RAM0);
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/*
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* Load the initrd data into /dev/ram0. Execute it as initrd
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* unless /dev/ram0 is supposed to be our actual root device,
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* in that case the ram disk is just set up here, and gets
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* mounted in the normal path.
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*/
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if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
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ksys_unlink("/initrd.image");
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handle_initrd();
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return true;
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}
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}
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ksys_unlink("/initrd.image");
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return false;
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}
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