/*
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/*
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* mmap.c
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* mmap.c
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*
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*
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* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
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* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
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*
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*
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*/
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*/
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/*
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/*
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* uClinux revisions for NO_MM
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* uClinux revisions for NO_MM
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
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* The Silver Hammer Group, Ltd.
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* The Silver Hammer Group, Ltd.
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*/
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*/
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#include <linux/stat.h>
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#include <linux/stat.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/shm.h>
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#include <linux/shm.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/mman.h>
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#include <linux/mman.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/malloc.h>
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#include <linux/malloc.h>
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#include <linux/smb_fs.h>
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#include <linux/smb_fs.h>
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#include <linux/fcntl.h>
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#include <linux/fcntl.h>
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#ifndef NO_MM
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#ifndef NO_MM
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/*
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/*
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* Fill in the supplied page for mmap
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* Fill in the supplied page for mmap
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*/
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*/
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static unsigned long
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static unsigned long
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smb_file_mmap_nopage(struct vm_area_struct *area,
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smb_file_mmap_nopage(struct vm_area_struct *area,
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unsigned long address, int no_share)
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unsigned long address, int no_share)
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{
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{
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struct inode *inode = area->vm_inode;
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struct inode *inode = area->vm_inode;
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unsigned long page;
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unsigned long page;
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unsigned int clear;
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unsigned int clear;
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unsigned long tmp;
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unsigned long tmp;
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int n;
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int n;
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int i;
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int i;
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int pos;
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int pos;
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page = __get_free_page(GFP_KERNEL);
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page = __get_free_page(GFP_KERNEL);
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if (!page)
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if (!page)
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return 0;
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return 0;
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address &= PAGE_MASK;
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address &= PAGE_MASK;
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pos = address - area->vm_start + area->vm_offset;
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pos = address - area->vm_start + area->vm_offset;
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clear = 0;
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clear = 0;
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if (address + PAGE_SIZE > area->vm_end)
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if (address + PAGE_SIZE > area->vm_end)
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{
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{
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clear = address + PAGE_SIZE - area->vm_end;
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clear = address + PAGE_SIZE - area->vm_end;
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}
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}
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/* what we can read in one go */
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/* what we can read in one go */
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n = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 3 - 10;
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n = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 3 - 10;
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if (smb_make_open(inode, O_RDONLY) < 0)
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if (smb_make_open(inode, O_RDONLY) < 0)
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{
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{
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clear = PAGE_SIZE;
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clear = PAGE_SIZE;
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} else
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} else
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{
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{
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for (i = 0; i < (PAGE_SIZE - clear); i += n)
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for (i = 0; i < (PAGE_SIZE - clear); i += n)
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{
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{
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int hunk, result;
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int hunk, result;
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hunk = PAGE_SIZE - i;
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hunk = PAGE_SIZE - i;
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if (hunk > n)
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if (hunk > n)
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hunk = n;
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hunk = n;
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DDPRINTK("smb_file_mmap_nopage: reading\n");
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DDPRINTK("smb_file_mmap_nopage: reading\n");
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DDPRINTK("smb_file_mmap_nopage: pos = %d\n", pos);
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DDPRINTK("smb_file_mmap_nopage: pos = %d\n", pos);
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result = smb_proc_read(SMB_SERVER(inode),
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result = smb_proc_read(SMB_SERVER(inode),
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SMB_FINFO(inode), pos, hunk,
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SMB_FINFO(inode), pos, hunk,
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(char *) (page + i), 0);
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(char *) (page + i), 0);
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DDPRINTK("smb_file_mmap_nopage: result= %d\n", result);
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DDPRINTK("smb_file_mmap_nopage: result= %d\n", result);
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if (result < 0)
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if (result < 0)
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break;
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break;
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pos += result;
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pos += result;
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if (result < n)
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if (result < n)
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{
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{
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i += result;
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i += result;
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break;
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break;
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}
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}
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}
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}
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}
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}
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tmp = page + PAGE_SIZE;
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tmp = page + PAGE_SIZE;
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while (clear--)
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while (clear--)
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{
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{
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*(char *) --tmp = 0;
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*(char *) --tmp = 0;
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}
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}
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return page;
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return page;
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}
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}
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struct vm_operations_struct smb_file_mmap =
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struct vm_operations_struct smb_file_mmap =
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{
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{
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NULL, /* open */
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NULL, /* open */
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NULL, /* close */
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NULL, /* close */
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NULL, /* unmap */
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NULL, /* unmap */
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NULL, /* protect */
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NULL, /* protect */
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NULL, /* sync */
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NULL, /* sync */
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NULL, /* advise */
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NULL, /* advise */
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smb_file_mmap_nopage, /* nopage */
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smb_file_mmap_nopage, /* nopage */
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NULL, /* wppage */
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NULL, /* wppage */
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NULL, /* swapout */
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NULL, /* swapout */
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NULL, /* swapin */
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NULL, /* swapin */
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};
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};
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/* This is used for a general mmap of a smb file */
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/* This is used for a general mmap of a smb file */
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int
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int
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smb_mmap(struct inode *inode, struct file *file, struct vm_area_struct *vma)
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smb_mmap(struct inode *inode, struct file *file, struct vm_area_struct *vma)
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{
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{
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DPRINTK("smb_mmap: called\n");
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DPRINTK("smb_mmap: called\n");
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/* only PAGE_COW or read-only supported now */
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/* only PAGE_COW or read-only supported now */
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if (vma->vm_flags & VM_SHARED)
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if (vma->vm_flags & VM_SHARED)
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return -EINVAL;
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return -EINVAL;
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if (!inode->i_sb || !S_ISREG(inode->i_mode))
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if (!inode->i_sb || !S_ISREG(inode->i_mode))
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return -EACCES;
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return -EACCES;
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if (!IS_RDONLY(inode))
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if (!IS_RDONLY(inode))
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{
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{
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inode->i_atime = CURRENT_TIME;
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inode->i_atime = CURRENT_TIME;
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inode->i_dirt = 1;
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inode->i_dirt = 1;
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}
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}
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vma->vm_inode = inode;
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vma->vm_inode = inode;
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inode->i_count++;
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inode->i_count++;
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vma->vm_ops = &smb_file_mmap;
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vma->vm_ops = &smb_file_mmap;
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return 0;
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return 0;
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}
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}
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#else /* NO_MM */
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#else /* NO_MM */
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int
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int
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smb_mmap(struct inode *inode, struct file *file, struct vm_area_struct *vma)\
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smb_mmap(struct inode *inode, struct file *file, struct vm_area_struct *vma)\
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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#endif /* NO_MM */
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#endif /* NO_MM */
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