Import of Linus's Linux 1.1.68

1 files changed, 598 insertions, 0 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
new file mode 100644
index 000000000..6fd7bccbe
--- /dev/null
+++ b/fs/proc/array.c
@@ -0,0 +1,598 @@
+/*
+ *  linux/fs/proc/array.c
+ *
+ *  Copyright (C) 1992  by Linus Torvalds
+ *  based on ideas by Darren Senn
+ *
+ * Fixes:
+ * Michael. K. Johnson: stat,statm extensions.
+ *                      <johnsonm@stolaf.edu>
+ *
+ * Pauline Middelink :  Made cmdline,envline only break at '\0's, to
+ *                      make sure SET_PROCTITLE works. Also removed
+ *                      bad '!' which forced address recalculation for
+ *                      EVERY character on the current page.
+ *                      <middelin@polyware.iaf.nl>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/tty.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/string.h>
+#include <linux/mman.h>
+#include <linux/proc_fs.h>
+
+#include <asm/segment.h>
+#include <asm/io.h>
+
+#define LOAD_INT(x) ((x) >> FSHIFT)
+#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
+
+#ifdef CONFIG_DEBUG_MALLOC
+int get_malloc(char * buffer);
+#endif
+
+static int read_core(struct inode * inode, struct file * file,char * buf, int count)
+{
+	unsigned long p = file->f_pos;
+	int read;
+	int count1;
+	char * pnt;
+	struct user dump;
+
+	memset(&dump, 0, sizeof(struct user));
+	dump.magic = CMAGIC;
+	dump.u_dsize = high_memory >> 12;
+
+	if (count < 0)
+		return -EINVAL;
+	if (p >= high_memory + PAGE_SIZE)
+		return 0;
+	if (count > high_memory + PAGE_SIZE - p)
+		count = high_memory + PAGE_SIZE - p;
+	read = 0;
+
+	if (p < sizeof(struct user) && count > 0) {
+		count1 = count;
+		if (p + count1 > sizeof(struct user))
+			count1 = sizeof(struct user)-p;
+		pnt = (char *) &dump + p;
+		memcpy_tofs(buf,(void *) pnt, count1);
+		buf += count1;
+		p += count1;
+		count -= count1;
+		read += count1;
+	}
+
+	while (p < 2*PAGE_SIZE && count > 0) {
+		put_fs_byte(0,buf);
+		buf++;
+		p++;
+		count--;
+		read++;
+	}
+	memcpy_tofs(buf,(void *) (p - PAGE_SIZE),count);
+	read += count;
+	file->f_pos += read;
+	return read;
+}
+
+static struct file_operations proc_kcore_operations = {
+	NULL,           /* lseek */
+	read_core,
+};
+
+struct inode_operations proc_kcore_inode_operations = {
+	&proc_kcore_operations, 
+};
+
+static int get_loadavg(char * buffer)
+{
+	int a, b, c;
+
+	a = avenrun[0] + (FIXED_1/200);
+	b = avenrun[1] + (FIXED_1/200);
+	c = avenrun[2] + (FIXED_1/200);
+	return sprintf(buffer,"%d.%02d %d.%02d %d.%02d\n",
+		LOAD_INT(a), LOAD_FRAC(a),
+		LOAD_INT(b), LOAD_FRAC(b),
+		LOAD_INT(c), LOAD_FRAC(c));
+}
+
+static int get_kstat(char * buffer)
+{
+	int i, len;
+	unsigned sum = 0;
+
+	for (i = 0 ; i < 16 ; i++)
+		sum += kstat.interrupts[i];
+	len = sprintf(buffer,
+		"cpu  %u %u %u %lu\n"
+		"disk %u %u %u %u\n"
+		"page %u %u\n"
+		"swap %u %u\n"
+		"intr %u",
+		kstat.cpu_user,
+		kstat.cpu_nice,
+		kstat.cpu_system,
+		jiffies - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
+		kstat.dk_drive[0],
+		kstat.dk_drive[1],
+		kstat.dk_drive[2],
+		kstat.dk_drive[3],
+		kstat.pgpgin,
+		kstat.pgpgout,
+		kstat.pswpin,
+		kstat.pswpout,
+		sum);
+	for (i = 0 ; i < 16 ; i++)
+		len += sprintf(buffer + len, " %u", kstat.interrupts[i]);
+	len += sprintf(buffer + len,
+		"\nctxt %u\n"
+		"btime %lu\n",
+		kstat.context_swtch,
+		xtime.tv_sec - jiffies / HZ);
+	return len;
+}
+
+
+static int get_uptime(char * buffer)
+{
+	unsigned long uptime;
+	unsigned long idle;
+
+	uptime = jiffies;
+	idle = task[0]->utime + task[0]->stime;
+	return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
+		uptime / HZ,
+		uptime % HZ,
+		idle / HZ,
+		idle % HZ);
+}
+
+static int get_meminfo(char * buffer)
+{
+	struct sysinfo i;
+
+	si_meminfo(&i);
+	si_swapinfo(&i);
+	return sprintf(buffer, "        total:   used:    free:   shared:  buffers:\n"
+		"Mem:  %8lu %8lu %8lu %8lu %8lu\n"
+		"Swap: %8lu %8lu %8lu\n",
+		i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram,
+		i.totalswap, i.totalswap-i.freeswap, i.freeswap);
+}
+
+static int get_version(char * buffer)
+{
+	extern char *linux_banner;
+
+	strcpy(buffer, linux_banner);
+	return strlen(buffer);
+}
+
+static struct task_struct ** get_task(pid_t pid)
+{
+	struct task_struct ** p;
+
+	p = task;
+	while (++p < task+NR_TASKS) {
+		if (*p && (*p)->pid == pid)
+			return p;
+	}
+	return NULL;
+}
+
+static unsigned long get_phys_addr(struct task_struct ** p, unsigned long ptr)
+{
+	unsigned long page;
+
+	if (!p || !*p || ptr >= TASK_SIZE)
+		return 0;
+	page = *PAGE_DIR_OFFSET((*p)->tss.cr3,ptr);
+	if (!(page & PAGE_PRESENT))
+		return 0;
+	page &= PAGE_MASK;
+	page += PAGE_PTR(ptr);
+	page = *(unsigned long *) page;
+	if (!(page & PAGE_PRESENT))
+		return 0;
+	page &= PAGE_MASK;
+	page += ptr & ~PAGE_MASK;
+	return page;
+}
+
+static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
+{
+	unsigned long addr;
+	int size = 0, result = 0;
+	char c;
+
+	if (start >= end)
+		return result;
+	for (;;) {
+		addr = get_phys_addr(p, start);
+		if (!addr)
+			goto ready;
+		do {
+			c = *(char *) addr;
+			if (!c)
+				result = size;
+			if (size < PAGE_SIZE)
+				buffer[size++] = c;
+			else
+				goto ready;
+			addr++;
+			start++;
+			if (!c && start >= end)
+				goto ready;
+		} while (addr & ~PAGE_MASK);
+	}
+ready:
+	/* remove the trailing blanks, used to fill out argv,envp space */
+	while (result>0 && buffer[result-1]==' ')
+		result--;
+	return result;
+}
+
+static int get_env(int pid, char * buffer)
+{
+	struct task_struct ** p = get_task(pid);
+
+	if (!p || !*p)
+		return 0;
+	return get_array(p, (*p)->mm->env_start, (*p)->mm->env_end, buffer);
+}
+
+static int get_arg(int pid, char * buffer)
+{
+	struct task_struct ** p = get_task(pid);
+
+	if (!p || !*p)
+		return 0;
+	return get_array(p, (*p)->mm->arg_start, (*p)->mm->arg_end, buffer);
+}
+
+static unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long ebp, eip;
+	unsigned long stack_page;
+	int count = 0;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+	stack_page = p->kernel_stack_page;
+	if (!stack_page)
+		return 0;
+	ebp = p->tss.ebp;
+	do {
+		if (ebp < stack_page || ebp >= 4092+stack_page)
+			return 0;
+		eip = *(unsigned long *) (ebp+4);
+		if ((void *)eip != sleep_on &&
+		    (void *)eip != interruptible_sleep_on)
+			return eip;
+		ebp = *(unsigned long *) ebp;
+	} while (count++ < 16);
+	return 0;
+}
+
+#define	KSTK_EIP(stack)	(((unsigned long *)stack)[1019])
+#define	KSTK_ESP(stack)	(((unsigned long *)stack)[1022])
+
+static int get_stat(int pid, char * buffer)
+{
+	struct task_struct ** p = get_task(pid);
+	unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
+	unsigned long vsize, eip, esp;
+	int i,tty_pgrp;
+	char state;
+
+	if (!p || !*p)
+		return 0;
+	if ((*p)->state < 0 || (*p)->state > 5)
+		state = '.';
+	else
+		state = "RSDZTD"[(*p)->state];
+	eip = esp = 0;
+	vsize = (*p)->kernel_stack_page;
+	if (vsize) {
+		eip = KSTK_EIP(vsize);
+		esp = KSTK_ESP(vsize);
+		vsize = (*p)->mm->brk - (*p)->mm->start_code + PAGE_SIZE-1;
+		if (esp)
+			vsize += TASK_SIZE - esp;
+	}
+	wchan = get_wchan(*p);
+	for(i=0; i<32; ++i) {
+		switch((int) (*p)->sigaction[i].sa_handler) {
+		case 1: sigignore |= bit; break;
+		case 0: break;
+		default: sigcatch |= bit;
+		} bit <<= 1;
+	}
+	if ((*p)->tty)
+		tty_pgrp = (*p)->tty->pgrp;
+	else
+		tty_pgrp = -1;
+	return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
+%lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %u %lu %lu %lu %lu %lu %lu \
+%lu %lu %lu %lu\n",
+		pid,
+		(*p)->comm,
+		state,
+		(*p)->p_pptr->pid,
+		(*p)->pgrp,
+		(*p)->session,
+	        (*p)->tty ? (*p)->tty->device : 0,
+		tty_pgrp,
+		(*p)->flags,
+		(*p)->mm->min_flt,
+		(*p)->mm->cmin_flt,
+		(*p)->mm->maj_flt,
+		(*p)->mm->cmaj_flt,
+		(*p)->utime,
+		(*p)->stime,
+		(*p)->cutime,
+		(*p)->cstime,
+		(*p)->counter,  /* this is the kernel priority ---
+				   subtract 30 in your user-level program. */
+		(*p)->priority, /* this is the nice value ---
+				   subtract 15 in your user-level program. */
+		(*p)->timeout,
+		(*p)->it_real_value,
+		(*p)->start_time,
+		vsize,
+		(*p)->mm->rss, /* you might want to shift this left 3 */
+		(*p)->rlim[RLIMIT_RSS].rlim_cur,
+		(*p)->mm->start_code,
+		(*p)->mm->end_code,
+		(*p)->mm->start_stack,
+		esp,
+		eip,
+		(*p)->signal,
+		(*p)->blocked,
+		sigignore,
+		sigcatch,
+		wchan);
+}
+
+static int get_statm(int pid, char * buffer)
+{
+	struct task_struct ** p = get_task(pid);
+	int i, tpag;
+	int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
+	unsigned long ptbl, *buf, *pte, *pagedir, map_nr;
+
+	if (!p || !*p)
+		return 0;
+	tpag = (*p)->mm->end_code / PAGE_SIZE;
+	if ((*p)->state != TASK_ZOMBIE) {
+	  pagedir = (unsigned long *) (*p)->tss.cr3;
+	  for (i = 0; i < 0x300; ++i) {
+	    if ((ptbl = pagedir[i]) == 0) {
+	      tpag -= PTRS_PER_PAGE;
+	      continue;
+	    }
+	    buf = (unsigned long *)(ptbl & PAGE_MASK);
+	    for (pte = buf; pte < (buf + PTRS_PER_PAGE); ++pte) {
+	      if (*pte != 0) {
+		++size;
+		if (*pte & 1) {
+		  ++resident;
+		  if (tpag > 0)
+		    ++trs;
+		  else
+		    ++drs;
+		  if (i >= 15 && i < 0x2f0) {
+		    ++lrs;
+		    if (*pte & 0x40)
+		      ++dt;
+		    else
+		      --drs;
+		  }
+		  map_nr = MAP_NR(*pte);
+		  if (map_nr < (high_memory / PAGE_SIZE) && mem_map[map_nr] > 1)
+		    ++share;
+		}
+	      }
+	      --tpag;
+	    }
+	  }
+	}
+	return sprintf(buffer,"%d %d %d %d %d %d %d\n",
+		       size, resident, share, trs, lrs, drs, dt);
+}
+
+static int get_maps(int pid, char *buf)
+{
+	int sz = 0;
+	struct task_struct **p = get_task(pid);
+	struct vm_area_struct *map;
+
+	if (!p || !*p)
+		return 0;
+
+	for(map = (*p)->mm->mmap; map != NULL; map = map->vm_next) {
+		char str[7], *cp = str;
+		int flags;
+		int end = sz + 80;	/* Length of line */
+		dev_t dev;
+		unsigned long ino;
+
+		flags = map->vm_flags;
+
+		*cp++ = flags & VM_READ ? 'r' : '-';
+		*cp++ = flags & VM_WRITE ? 'w' : '-';
+		*cp++ = flags & VM_EXEC ? 'x' : '-';
+		*cp++ = flags & VM_SHARED ? 's' : 'p';
+		*cp++ = 0;
+		
+		if (end >= PAGE_SIZE) {
+			sprintf(buf+sz, "...\n");
+			break;
+		}
+		
+		if (map->vm_inode != NULL) {
+			dev = map->vm_inode->i_dev;
+			ino = map->vm_inode->i_ino;
+		} else {
+			dev = 0;
+			ino = 0;
+		}
+
+		sz += sprintf(buf+sz, "%08lx-%08lx %s %08lx %02x:%02x %lu\n",
+			      map->vm_start, map->vm_end, str, map->vm_offset,
+			      MAJOR(dev),MINOR(dev), ino);
+		if (sz > end) {
+			printk("get_maps: end(%d) < sz(%d)\n", end, sz);
+			break;
+		}
+	}
+	
+	return sz;
+}
+
+extern int get_module_list(char *);
+extern int get_device_list(char *);
+extern int get_filesystem_list(char *);
+extern int get_ksyms_list(char *);
+extern int get_irq_list(char *);
+extern int get_dma_list(char *);
+
+static int get_root_array(char * page, int type)
+{
+	switch (type) {
+		case PROC_LOADAVG:
+			return get_loadavg(page);
+
+		case PROC_UPTIME:
+			return get_uptime(page);
+
+		case PROC_MEMINFO:
+			return get_meminfo(page);
+
+		case PROC_VERSION:
+			return get_version(page);
+
+#ifdef CONFIG_DEBUG_MALLOC
+		case PROC_MALLOC:
+			return get_malloc(page);
+#endif
+
+		case PROC_MODULES:
+			return get_module_list(page);
+
+		case PROC_STAT:
+			return get_kstat(page);
+
+		case PROC_DEVICES:
+			return get_device_list(page);
+
+		case PROC_INTERRUPTS:
+			return get_irq_list(page);
+
+		case PROC_FILESYSTEMS:
+			return get_filesystem_list(page);
+
+		case PROC_KSYMS:
+			return get_ksyms_list(page);
+
+		case PROC_DMA:
+			return get_dma_list(page);
+	}
+	return -EBADF;
+}
+
+static int get_process_array(char * page, int pid, int type)
+{
+	switch (type) {
+		case PROC_PID_ENVIRON:
+			return get_env(pid, page);
+		case PROC_PID_CMDLINE:
+			return get_arg(pid, page);
+		case PROC_PID_STAT:
+			return get_stat(pid, page);
+		case PROC_PID_STATM:
+			return get_statm(pid, page);
+		case PROC_PID_MAPS:
+			return get_maps(pid, page);
+	}
+	return -EBADF;
+}
+
+
+static inline int fill_array(char * page, int pid, int type)
+{
+	if (pid)
+		return get_process_array(page, pid, type);
+	return get_root_array(page, type);
+}
+
+static int array_read(struct inode * inode, struct file * file,char * buf, int count)
+{
+	unsigned long page;
+	int length;
+	int end;
+	unsigned int type, pid;
+
+	if (count < 0)
+		return -EINVAL;
+	if (!(page = __get_free_page(GFP_KERNEL)))
+		return -ENOMEM;
+	type = inode->i_ino;
+	pid = type >> 16;
+	type &= 0x0000ffff;
+	length = fill_array((char *) page, pid, type);
+	if (length < 0) {
+		free_page(page);
+		return length;
+	}
+	if (file->f_pos >= length) {
+		free_page(page);
+		return 0;
+	}
+	if (count + file->f_pos > length)
+		count = length - file->f_pos;
+	end = count + file->f_pos;
+	memcpy_tofs(buf, (char *) page + file->f_pos, count);
+	free_page(page);
+	file->f_pos = end;
+	return count;
+}
+
+static struct file_operations proc_array_operations = {
+	NULL,		/* array_lseek */
+	array_read,
+	NULL,		/* array_write */
+	NULL,		/* array_readdir */
+	NULL,		/* array_select */
+	NULL,		/* array_ioctl */
+	NULL,		/* mmap */
+	NULL,		/* no special open code */
+	NULL,		/* no special release code */
+	NULL		/* can't fsync */
+};
+
+struct inode_operations proc_array_inode_operations = {
+	&proc_array_operations,	/* default base directory file-ops */
+	NULL,			/* create */
+	NULL,			/* 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 */
+};