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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [smbfs/] [mmap.c] - Blame information for rev 1628

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

Line No.	Rev	Author	Line
1	1628	jcastillo	`/*`
2			`* mmap.c`
3			`*`
4			`* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke`
5			`*`
6			`*/`
7
8			`/*`
9			`* uClinux revisions for NO_MM`
10			`* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,`
11			`* The Silver Hammer Group, Ltd.`
12			`*/`
13
14			`#include <linux/stat.h>`
15			`#include <linux/sched.h>`
16			`#include <linux/kernel.h>`
17			`#include <linux/mm.h>`
18			`#include <linux/shm.h>`
19			`#include <linux/errno.h>`
20			`#include <linux/mman.h>`
21			`#include <linux/string.h>`
22			`#include <linux/malloc.h>`
23			`#include <linux/smb_fs.h>`
24			`#include <linux/fcntl.h>`
25
26			`#include <asm/segment.h>`
27			`#include <asm/system.h>`
28
29			`#ifndef NO_MM`
30
31			`/*`
32			`* Fill in the supplied page for mmap`
33			`*/`
34			`static unsigned long`
35			`smb_file_mmap_nopage(struct vm_area_struct *area,`
36			`unsigned long address, int no_share)`
37			`{`
38			`struct inode *inode = area->vm_inode;`
39			`unsigned long page;`
40			`unsigned int clear;`
41			`unsigned long tmp;`
42			`int n;`
43			`int i;`
44			`int pos;`
45
46			`page = __get_free_page(GFP_KERNEL);`
47			`if (!page)`
48			`return 0;`
49			`address &= PAGE_MASK;`
50			`pos = address - area->vm_start + area->vm_offset;`
51
52			`clear = 0;`
53			`if (address + PAGE_SIZE > area->vm_end)`
54			`{`
55			`clear = address + PAGE_SIZE - area->vm_end;`
56			`}`
57			`/* what we can read in one go */`
58			`n = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 3 - 10;`
59
60			`if (smb_make_open(inode, O_RDONLY) < 0)`
61			`{`
62			`clear = PAGE_SIZE;`
63			`} else`
64			`{`
65
66			`for (i = 0; i < (PAGE_SIZE - clear); i += n)`
67			`{`
68			`int hunk, result;`
69
70			`hunk = PAGE_SIZE - i;`
71			`if (hunk > n)`
72			`hunk = n;`
73
74			`DDPRINTK("smb_file_mmap_nopage: reading\n");`
75			`DDPRINTK("smb_file_mmap_nopage: pos = %d\n", pos);`
76			`result = smb_proc_read(SMB_SERVER(inode),`
77			`SMB_FINFO(inode), pos, hunk,`
78			`(char *) (page + i), 0);`
79			`DDPRINTK("smb_file_mmap_nopage: result= %d\n", result);`
80			`if (result < 0)`
81			`break;`
82			`pos += result;`
83			`if (result < n)`
84			`{`
85			`i += result;`
86			`break;`
87			`}`
88			`}`
89			`}`
90
91			`tmp = page + PAGE_SIZE;`
92			`while (clear--)`
93			`{`
94			`(char ) --tmp = 0;`
95			`}`
96			`return page;`
97			`}`
98
99			`struct vm_operations_struct smb_file_mmap =`
100			`{`
101			`NULL, /* open */`
102			`NULL, /* close */`
103			`NULL, /* unmap */`
104			`NULL, /* protect */`
105			`NULL, /* sync */`
106			`NULL, /* advise */`
107			`smb_file_mmap_nopage, /* nopage */`
108			`NULL, /* wppage */`
109			`NULL, /* swapout */`
110			`NULL, /* swapin */`
111			`};`
112
113
114			`/* This is used for a general mmap of a smb file */`
115			`int`
116			`smb_mmap(struct inode inode, struct file file, struct vm_area_struct *vma)`
117			`{`
118			`DPRINTK("smb_mmap: called\n");`
119
120			`/* only PAGE_COW or read-only supported now */`
121			`if (vma->vm_flags & VM_SHARED)`
122			`return -EINVAL;`
123			`if (!inode->i_sb \|\| !S_ISREG(inode->i_mode))`
124			`return -EACCES;`
125			`if (!IS_RDONLY(inode))`
126			`{`
127			`inode->i_atime = CURRENT_TIME;`
128			`inode->i_dirt = 1;`
129			`}`
130			`vma->vm_inode = inode;`
131			`inode->i_count++;`
132			`vma->vm_ops = &smb_file_mmap;`
133			`return 0;`
134			`}`
135
136			`#else /* NO_MM */`
137
138			`int`
139			`smb_mmap(struct inode inode, struct file file, struct vm_area_struct *vma)\`
140			`{`
141			`return -ENOSYS;`
142			`}`
143
144			`#endif /* NO_MM */`

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [smbfs/] [mmap.c] - Blame information for rev 1628