Import of Linus's Linux 1.1.68

1 files changed, 184 insertions, 0 deletions

diff --git a/fs/proc/root.c b/fs/proc/root.c
new file mode 100644
index 000000000..97cf2ff25
--- /dev/null
+++ b/fs/proc/root.c
@@ -0,0 +1,184 @@
+/*
+ *  linux/fs/proc/root.c
+ *
+ *  Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ *  proc root directory handling functions
+ */
+
+#include <asm/segment.h>
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/config.h>
+
+static int proc_readroot(struct inode *, struct file *, struct dirent *, int);
+static int proc_lookuproot(struct inode *,const char *,int,struct inode **);
+
+static struct file_operations proc_root_operations = {
+	NULL,			/* lseek - default */
+	NULL,			/* read - bad */
+	NULL,			/* write - bad */
+	proc_readroot,		/* readdir */
+	NULL,			/* select - default */
+	NULL,			/* ioctl - default */
+	NULL,			/* mmap */
+	NULL,			/* no special open code */
+	NULL,			/* no special release code */
+	NULL			/* no fsync */
+};
+
+/*
+ * proc directories can do almost nothing..
+ */
+struct inode_operations proc_root_inode_operations = {
+	&proc_root_operations,	/* default base directory file-ops */
+	NULL,			/* create */
+	proc_lookuproot,	/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	NULL,			/* readlink */
+	NULL,			/* follow_link */
+	NULL,			/* bmap */
+	NULL,			/* truncate */
+	NULL			/* permission */
+};
+
+static struct proc_dir_entry root_dir[] = {
+	{ PROC_ROOT_INO,	1, "." },
+	{ PROC_ROOT_INO,	2, ".." },
+	{ PROC_LOADAVG,		7, "loadavg" },
+	{ PROC_UPTIME,		6, "uptime" },
+	{ PROC_MEMINFO,		7, "meminfo" },
+	{ PROC_KMSG,		4, "kmsg" },
+	{ PROC_VERSION,		7, "version" },
+	{ PROC_SELF,		4, "self" },	/* will change inode # */
+	{ PROC_NET,		3, "net" },
+#ifdef CONFIG_DEBUG_MALLOC
+	{ PROC_MALLOC,		6, "malloc" },
+#endif
+	{ PROC_KCORE,		5, "kcore" },
+   	{ PROC_MODULES,		7, "modules" },
+   	{ PROC_STAT,		4, "stat" },
+   	{ PROC_DEVICES,		7, "devices" },
+	{ PROC_INTERRUPTS,	10,"interrupts" },
+   	{ PROC_FILESYSTEMS,	11,"filesystems" },
+   	{ PROC_KSYMS,		5, "ksyms" },
+   	{ PROC_DMA,		3, "dma" },
+};
+
+#define NR_ROOT_DIRENTRY ((sizeof (root_dir))/(sizeof (root_dir[0])))
+
+static int proc_lookuproot(struct inode * dir,const char * name, int len,
+	struct inode ** result)
+{
+	unsigned int pid, c;
+	int i, ino;
+
+	*result = NULL;
+	if (!dir)
+		return -ENOENT;
+	if (!S_ISDIR(dir->i_mode)) {
+		iput(dir);
+		return -ENOENT;
+	}
+	i = NR_ROOT_DIRENTRY;
+	while (i-- > 0 && !proc_match(len,name,root_dir+i))
+		/* nothing */;
+	if (i >= 0) {
+		ino = root_dir[i].low_ino;
+		if (ino == PROC_ROOT_INO) {
+			*result = dir;
+			return 0;
+		}
+		if (ino == PROC_SELF) /* self modifying inode ... */
+			ino = (current->pid << 16) + 2;
+	} else {
+		pid = 0;
+		while (len-- > 0) {
+			c = *name - '0';
+			name++;
+			if (c > 9) {
+				pid = 0;
+				break;
+			}
+			pid *= 10;
+			pid += c;
+			if (pid & 0xffff0000) {
+				pid = 0;
+				break;
+			}
+		}
+		for (i = 0 ; i < NR_TASKS ; i++)
+			if (task[i] && task[i]->pid == pid)
+				break;
+		if (!pid || i >= NR_TASKS) {
+			iput(dir);
+			return -ENOENT;
+		}
+		ino = (pid << 16) + 2;
+	}
+	if (!(*result = iget(dir->i_sb,ino))) {
+		iput(dir);
+		return -ENOENT;
+	}
+	iput(dir);
+	return 0;
+}
+
+static int proc_readroot(struct inode * inode, struct file * filp,
+	struct dirent * dirent, int count)
+{
+	struct task_struct * p;
+	unsigned int nr,pid;
+	int i,j;
+
+	if (!inode || !S_ISDIR(inode->i_mode))
+		return -EBADF;
+repeat:
+	nr = filp->f_pos;
+	if (nr < NR_ROOT_DIRENTRY) {
+		struct proc_dir_entry * de = root_dir + nr;
+
+		filp->f_pos++;
+		i = de->namelen;
+		put_fs_long(de->low_ino, &dirent->d_ino);
+		put_fs_word(i,&dirent->d_reclen);
+		put_fs_byte(0,i+dirent->d_name);
+		j = i;
+		while (i--)
+			put_fs_byte(de->name[i], i+dirent->d_name);
+		return j;
+	}
+	nr -= NR_ROOT_DIRENTRY;
+	if (nr >= NR_TASKS)
+		return 0;
+	filp->f_pos++;
+	p = task[nr];
+	if (!p || !(pid = p->pid))
+		goto repeat;
+	if (pid & 0xffff0000)
+		goto repeat;
+	j = 10;
+	i = 1;
+	while (pid >= j) {
+		j *= 10;
+		i++;
+	}
+	j = i;
+	put_fs_long((pid << 16)+2, &dirent->d_ino);
+	put_fs_word(i, &dirent->d_reclen);
+	put_fs_byte(0, i+dirent->d_name);
+	while (i--) {
+		put_fs_byte('0'+(pid % 10), i+dirent->d_name);
+		pid /= 10;
+	}
+	return j;
+}