#include <linux/crash_dump.h>
#include <linux/backing-dev.h>
#include <linux/bootmem.h>
+#include <linux/pipe_fs_i.h>
#include <asm/uaccess.h>
#include <asm/io.h>
}
#ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
-static inline int valid_phys_addr_range(unsigned long addr, size_t *count)
+static inline int valid_phys_addr_range(unsigned long addr, size_t count)
{
- unsigned long end_mem;
-
- end_mem = __pa(high_memory);
- if (addr >= end_mem)
+ if (addr + count > __pa(high_memory))
return 0;
- if (*count > end_mem - addr)
- *count = end_mem - addr;
+ return 1;
+}
+static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t size)
+{
return 1;
}
#endif
ssize_t read, sz;
char *ptr;
- if (!valid_phys_addr_range(p, &count))
+ if (!valid_phys_addr_range(p, count))
return -EFAULT;
read = 0;
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
unsigned long copied;
void *ptr;
- if (!valid_phys_addr_range(p, &count))
+ if (!valid_phys_addr_range(p, count))
return -EFAULT;
written = 0;
copied = copy_from_user(ptr, buf, sz);
if (copied) {
- ssize_t ret;
-
- ret = written + (sz - copied);
- if (ret)
- return ret;
+ written += sz - copied;
+ if (written)
+ break;
return -EFAULT;
}
buf += sz;
return written;
}
+#ifndef __HAVE_PHYS_MEM_ACCESS_PROT
+static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+ unsigned long size, pgprot_t vma_prot)
+{
+#ifdef pgprot_noncached
+ unsigned long offset = pfn << PAGE_SHIFT;
+
+ if (uncached_access(file, offset))
+ return pgprot_noncached(vma_prot);
+#endif
+ return vma_prot;
+}
+#endif
+
static int mmap_mem(struct file * file, struct vm_area_struct * vma)
{
-#if defined(__HAVE_PHYS_MEM_ACCESS_PROT)
+ size_t size = vma->vm_end - vma->vm_start;
+
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))
+ return -EINVAL;
+
vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
+ size,
vma->vm_page_prot);
-#elif defined(pgprot_noncached)
- unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
- int uncached;
-
- uncached = uncached_access(file, offset);
- if (uncached)
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-#endif
/* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
if (remap_pfn_range(vma,
vma->vm_start,
vma->vm_pgoff,
- vma->vm_end-vma->vm_start,
+ size,
vma->vm_page_prot))
return -EAGAIN;
return 0;
copied = copy_from_user(ptr, buf, sz);
if (copied) {
- ssize_t ret;
-
- ret = written + (sz - copied);
- if (ret)
- return ret;
+ written += sz - copied;
+ if (written)
+ break;
return -EFAULT;
}
buf += sz;
if (len) {
written = copy_from_user(kbuf, buf, len);
if (written) {
- ssize_t ret;
-
+ if (wrote + virtr)
+ break;
free_page((unsigned long)kbuf);
- ret = wrote + virtr + (len - written);
- return ret ? ret : -EFAULT;
+ return -EFAULT;
}
}
len = vwrite(kbuf, (char *)p, len);
return virtr + wrote;
}
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
static ssize_t read_port(struct file * file, char __user * buf,
size_t count, loff_t *ppos)
{
return -EFAULT;
while (count-- > 0 && i < 65536) {
char c;
- if (__get_user(c, tmp))
+ if (__get_user(c, tmp)) {
+ if (tmp > buf)
+ break;
return -EFAULT;
+ }
outb(c,i);
i++;
tmp++;
return count;
}
+static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
+ struct splice_desc *sd)
+{
+ return sd->len;
+}
+
+static ssize_t splice_write_null(struct pipe_inode_info *pipe,struct file *out,
+ loff_t *ppos, size_t len, unsigned int flags)
+{
+ return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);
+}
+
#ifdef CONFIG_MMU
/*
* For fun, we are using the MMU for this.
{
loff_t ret;
- down(&file->f_dentry->d_inode->i_sem);
+ mutex_lock(&file->f_dentry->d_inode->i_mutex);
switch (orig) {
case 0:
file->f_pos = offset;
default:
ret = -EINVAL;
}
- up(&file->f_dentry->d_inode->i_sem);
+ mutex_unlock(&file->f_dentry->d_inode->i_mutex);
return ret;
}
.llseek = null_lseek,
.read = read_null,
.write = write_null,
+ .splice_write = splice_write_null,
};
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
static struct file_operations port_fops = {
.llseek = memory_lseek,
.read = read_port,
size_t count, loff_t *ppos)
{
char *tmp;
- int ret;
+ ssize_t ret;
tmp = kmalloc(count + 1, GFP_KERNEL);
if (tmp == NULL)
if (!copy_from_user(tmp, buf, count)) {
tmp[count] = 0;
ret = printk("%s", tmp);
+ if (ret > count)
+ /* printk can add a prefix */
+ ret = count;
}
kfree(tmp);
return ret;
case 3:
filp->f_op = &null_fops;
break;
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
case 4:
filp->f_op = &port_fops;
break;
unsigned int minor;
char *name;
umode_t mode;
- struct file_operations *fops;
+ const struct file_operations *fops;
} devlist[] = { /* list of minor devices */
{1, "mem", S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops},
{2, "kmem", S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops},
{3, "null", S_IRUGO | S_IWUGO, &null_fops},
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
{4, "port", S_IRUSR | S_IWUSR | S_IRGRP, &port_fops},
#endif
{5, "zero", S_IRUGO | S_IWUGO, &zero_fops},
git.samba.org / sfrench / cifs-2.6.git / blobdiff