Release 4.10 fs/ncpfs/mmap.c
/*
* mmap.c
*
* Copyright (C) 1995, 1996 by Volker Lendecke
* Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
*
*/
#include <linux/stat.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/shm.h>
#include <linux/errno.h>
#include <linux/mman.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/memcontrol.h>
#include <linux/uaccess.h>
#include "ncp_fs.h"
/*
* Fill in the supplied page for mmap
* XXX: how are we excluding truncate/invalidate here? Maybe need to lock
* page?
*/
static int ncp_file_mmap_fault(struct vm_area_struct *area,
struct vm_fault *vmf)
{
struct inode *inode = file_inode(area->vm_file);
char *pg_addr;
unsigned int already_read;
unsigned int count;
int bufsize;
int pos; /* XXX: loff_t ? */
/*
* ncpfs has nothing against high pages as long
* as recvmsg and memset works on it
*/
vmf->page = alloc_page(GFP_HIGHUSER);
if (!vmf->page)
return VM_FAULT_OOM;
pg_addr = kmap(vmf->page);
pos = vmf->pgoff << PAGE_SHIFT;
count = PAGE_SIZE;
/* what we can read in one go */
bufsize = NCP_SERVER(inode)->buffer_size;
already_read = 0;
if (ncp_make_open(inode, O_RDONLY) >= 0) {
while (already_read < count) {
int read_this_time;
int to_read;
to_read = bufsize - (pos % bufsize);
to_read = min_t(unsigned int, to_read, count - already_read);
if (ncp_read_kernel(NCP_SERVER(inode),
NCP_FINFO(inode)->file_handle,
pos, to_read,
pg_addr + already_read,
&read_this_time) != 0) {
read_this_time = 0;
}
pos += read_this_time;
already_read += read_this_time;
if (read_this_time < to_read) {
break;
}
}
ncp_inode_close(inode);
}
if (already_read < PAGE_SIZE)
memset(pg_addr + already_read, 0, PAGE_SIZE - already_read);
flush_dcache_page(vmf->page);
kunmap(vmf->page);
/*
* If I understand ncp_read_kernel() properly, the above always
* fetches from the network, here the analogue of disk.
* -- nyc
*/
count_vm_event(PGMAJFAULT);
mem_cgroup_count_vm_event(area->vm_mm, PGMAJFAULT);
return VM_FAULT_MAJOR;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 211 | 81.47% | 11 | 52.38% |
| nick piggin | nick piggin | 21 | 8.11% | 2 | 9.52% |
| ying han | ying han | 9 | 3.47% | 1 | 4.76% |
| linus torvalds | linus torvalds | 6 | 2.32% | 3 | 14.29% |
| al viro | al viro | 5 | 1.93% | 1 | 4.76% |
| andrew morton | andrew morton | 4 | 1.54% | 1 | 4.76% |
| christoph lameter | christoph lameter | 2 | 0.77% | 1 | 4.76% |
| nadia yvette chambers | nadia yvette chambers | 1 | 0.39% | 1 | 4.76% |
| Total | 259 | 100.00% | 21 | 100.00% |
static const struct vm_operations_struct ncp_file_mmap =
{
.fault = ncp_file_mmap_fault,
};
/* This is used for a general mmap of a ncp file */
int ncp_mmap(struct file *file, struct vm_area_struct *vma)
{
struct inode *inode = file_inode(file);
ncp_dbg(1, "called\n");
if (!ncp_conn_valid(NCP_SERVER(inode)))
return -EIO;
/* only PAGE_COW or read-only supported now */
if (vma->vm_flags & VM_SHARED)
return -EINVAL;
/* we do not support files bigger than 4GB... We eventually
supports just 4GB... */
if (vma_pages(vma) + vma->vm_pgoff
> (1U << (32 - PAGE_SHIFT)))
return -EFBIG;
vma->vm_ops = &ncp_file_mmap;
file_accessed(file);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 86 | 85.15% | 5 | 55.56% |
| christoph hellwig | christoph hellwig | 5 | 4.95% | 1 | 11.11% |
| joe perches | joe perches | 4 | 3.96% | 1 | 11.11% |
| li bin | li bin | 3 | 2.97% | 1 | 11.11% |
| al viro | al viro | 3 | 2.97% | 1 | 11.11% |
| Total | 101 | 100.00% | 9 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 337 | 81.20% | 16 | 44.44% |
| nick piggin | nick piggin | 24 | 5.78% | 2 | 5.56% |
| ying han | ying han | 12 | 2.89% | 1 | 2.78% |
| al viro | al viro | 9 | 2.17% | 3 | 8.33% |
| linus torvalds | linus torvalds | 7 | 1.69% | 4 | 11.11% |
| christoph hellwig | christoph hellwig | 5 | 1.20% | 1 | 2.78% |
| andrew morton | andrew morton | 4 | 0.96% | 1 | 2.78% |
| joe perches | joe perches | 4 | 0.96% | 1 | 2.78% |
| li bin | li bin | 3 | 0.72% | 1 | 2.78% |
| tejun heo | tejun heo | 3 | 0.72% | 1 | 2.78% |
| christoph lameter | christoph lameter | 2 | 0.48% | 1 | 2.78% |
| petr vandrovec* | petr vandrovec* | 2 | 0.48% | 1 | 2.78% |
| nadia yvette chambers | nadia yvette chambers | 1 | 0.24% | 1 | 2.78% |
| alexey dobriyan | alexey dobriyan | 1 | 0.24% | 1 | 2.78% |
| dave jones | dave jones | 1 | 0.24% | 1 | 2.78% |
| Total | 415 | 100.00% | 36 | 100.00% |
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