From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/init/do_mounts_rd.c | 101 ++++++++++++++++++++++----------------------------
1 files changed, 45 insertions(+), 56 deletions(-)
diff --git a/kernel/init/do_mounts_rd.c b/kernel/init/do_mounts_rd.c
index 32fb049..ac021ae 100644
--- a/kernel/init/do_mounts_rd.c
+++ b/kernel/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 @@
}
__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 @@
* 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 @@
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 @@
/*
* 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 @@
/*
* 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 @@
/*
* 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 @@
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 @@
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 @@
* 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 @@
/*
* 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 @@
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 @@
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 @@
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_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 @@
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. "
--
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