add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

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