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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [ncpfs/] [file.c] - Blame information for rev 1628

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Line No. Rev Author Line
1 1628 jcastillo 
/*
2 
 *  file.c
3 
 *
4 
 *  Copyright (C) 1995, 1996 by Volker Lendecke
5 
 *
6 
 */
7 
 
8 
#include <asm/segment.h>
9 
#include <asm/system.h>
10 
 
11 
#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/mm.h>
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#include <linux/ncp_fs.h>
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#include <linux/locks.h>
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#include "ncplib_kernel.h"
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#include <linux/malloc.h>
21 
 
22 
static inline int min(int a, int b)
23 
{
24 
        return a<b ? a : b;
25 
}
26 
 
27 
static int
28 
ncp_fsync(struct inode *inode, struct file *file)
29 
{
30 
        return 0;
31 
}
32 
 
33 
int
34 
ncp_make_open(struct inode *i, int right)
35 
{
36 
        struct nw_file_info *finfo;
37 
 
38 
        if (i == NULL)
39 
        {
40 
                printk("ncp_make_open: got NULL inode\n");
41 
                return -EINVAL;
42 
        }
43 
 
44 
        finfo = NCP_FINFO(i);
45 
 
46 
        DPRINTK("ncp_make_open: dirent->opened = %d\n", finfo->opened);
47 
 
48 
        lock_super(i->i_sb);
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        if (finfo->opened == 0)
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        {
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                finfo->access = -1;
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                /* tries max. rights */
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                if (ncp_open_create_file_or_subdir(NCP_SERVER(i),
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                                                   NULL, NULL,
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                                                   OC_MODE_OPEN, 0,
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                                                   AR_READ | AR_WRITE,
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                                                   finfo) == 0)
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                {
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                        finfo->access = O_RDWR;
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                }
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                else if (ncp_open_create_file_or_subdir(NCP_SERVER(i),
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                                                        NULL, NULL,
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                                                        OC_MODE_OPEN, 0,
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                                                        AR_READ,
65 
                                                        finfo) == 0)
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                {
67 
                        finfo->access = O_RDONLY;
68 
                }
69 
        }
70 
 
71 
        unlock_super(i->i_sb);
72 
 
73 
        if (   ((right == O_RDONLY) && (   (finfo->access == O_RDONLY)
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                                        || (finfo->access == O_RDWR)))
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            || ((right == O_WRONLY) && (   (finfo->access == O_WRONLY)
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                                        || (finfo->access == O_RDWR)))
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            || ((right == O_RDWR)   && (finfo->access == O_RDWR)))
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                return 0;
79 
 
80 
        return -EACCES;
81 
}
82 
 
83 
static int
84 
ncp_file_read(struct inode *inode, struct file *file, char *buf, int count)
85 
{
86 
        int bufsize, already_read;
87 
        off_t pos;
88 
        int errno;
89 
 
90 
        DPRINTK("ncp_file_read: enter %s\n", NCP_ISTRUCT(inode)->entryName);
91 
 
92 
        if (inode == NULL)
93 
        {
94 
                DPRINTK("ncp_file_read: inode = NULL\n");
95 
                return -EINVAL;
96 
        }
97 
        if (!ncp_conn_valid(NCP_SERVER(inode)))
98 
        {
99 
                return -EIO;
100 
        }
101 
 
102 
        if (!S_ISREG(inode->i_mode))
103 
        {
104 
                DPRINTK("ncp_file_read: read from non-file, mode %07o\n",
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                        inode->i_mode);
106 
                return -EINVAL;
107 
        }
108 
 
109 
        pos = file->f_pos;
110 
 
111 
        if (pos + count > inode->i_size)
112 
        {
113 
                count = inode->i_size - pos;
114 
        }
115 
 
116 
        if (count <= 0)
117 
        {
118 
                return 0;
119 
        }
120 
 
121 
        if ((errno = ncp_make_open(inode, O_RDONLY)) != 0)
122 
        {
123 
                return errno;
124 
        }
125 
 
126 
        bufsize = NCP_SERVER(inode)->buffer_size;
127 
 
128 
        already_read = 0;
129 
 
130 
        /* First read in as much as possible for each bufsize. */
131 
        while (already_read < count)
132 
        {
133 
                int read_this_time;
134 
                int to_read = min(bufsize - (pos % bufsize),
135 
                                  count - already_read);
136 
 
137 
                if (ncp_read(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
138 
                             pos, to_read, buf, &read_this_time) != 0)
139 
                {
140 
                        return -EIO; /* This is not exact, i know.. */
141 
                }
142 
 
143 
                pos += read_this_time;
144 
                buf += read_this_time;
145 
                already_read += read_this_time;
146 
 
147 
                if (read_this_time < to_read)
148 
                {
149 
                        break;
150 
                }
151 
        }
152 
 
153 
        file->f_pos = pos;
154 
 
155 
        if (!IS_RDONLY(inode))
156 
        {
157 
                inode->i_atime = CURRENT_TIME;
158 
        }
159 
 
160 
        inode->i_dirt = 1;
161 
 
162 
        DPRINTK("ncp_file_read: exit %s\n", NCP_ISTRUCT(inode)->entryName);
163 
 
164 
        return already_read;
165 
}
166 
 
167 
static int
168 
ncp_file_write(struct inode *inode, struct file *file, const char *buf,
169 
               int count)
170 
{
171 
        int bufsize, already_written;
172 
        off_t pos;
173 
        int errno;
174 
 
175 
        if (inode == NULL)
176 
        {
177 
                DPRINTK("ncp_file_write: inode = NULL\n");
178 
                return -EINVAL;
179 
        }
180 
        if (!ncp_conn_valid(NCP_SERVER(inode)))
181 
        {
182 
                return -EIO;
183 
        }
184 
 
185 
        if (!S_ISREG(inode->i_mode))
186 
        {
187 
                DPRINTK("ncp_file_write: write to non-file, mode %07o\n",
188 
                       inode->i_mode);
189 
                return -EINVAL;
190 
        }
191 
 
192 
        DPRINTK("ncp_file_write: enter %s\n", NCP_ISTRUCT(inode)->entryName);
193 
 
194 
        if (count <= 0)
195 
        {
196 
                return 0;
197 
        }
198 
 
199 
        if ((errno = ncp_make_open(inode, O_RDWR)) != 0)
200 
        {
201 
                return errno;
202 
        }
203 
 
204 
        pos = file->f_pos;
205 
 
206 
        if (file->f_flags & O_APPEND)
207 
        {
208 
                pos = inode->i_size;
209 
        }
210 
 
211 
        bufsize = NCP_SERVER(inode)->buffer_size;
212 
 
213 
        already_written = 0;
214 
 
215 
        while (already_written < count)
216 
        {
217 
                int written_this_time;
218 
                int to_write = min(bufsize - (pos % bufsize),
219 
                                   count - already_written);
220 
 
221 
                if (ncp_write(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
222 
                              pos, to_write, buf, &written_this_time) != 0)
223 
                {
224 
                        return -EIO;
225 
                }
226 
 
227 
                pos += written_this_time;
228 
                buf += written_this_time;
229 
                already_written += written_this_time;
230 
 
231 
                if (written_this_time < to_write)
232 
                {
233 
                        break;
234 
                }
235 
        }
236 
 
237 
        inode->i_mtime = inode->i_ctime = CURRENT_TIME;
238 
        inode->i_dirt = 1;
239 
 
240 
        file->f_pos = pos;
241 
 
242 
        if (pos > inode->i_size)
243 
        {
244 
                inode->i_size = pos;
245 
                ncp_invalid_dir_cache(NCP_INOP(inode)->dir->inode);
246 
        }
247 
 
248 
        DPRINTK("ncp_file_write: exit %s\n", NCP_ISTRUCT(inode)->entryName);
249 
 
250 
        return already_written;
251 
}
252 
 
253 
static struct file_operations ncp_file_operations = {
254 
        NULL,                   /* lseek - default */
255 
        ncp_file_read,          /* read */
256 
        ncp_file_write,         /* write */
257 
        NULL,                   /* readdir - bad */
258 
        NULL,                   /* select - default */
259 
        ncp_ioctl,              /* ioctl */
260 
        ncp_mmap,               /* mmap */
261 
        NULL,                   /* open */
262 
        NULL,                   /* release */
263 
        ncp_fsync,              /* fsync */
264 
};
265 
 
266 
struct inode_operations ncp_file_inode_operations = {
267 
        &ncp_file_operations,   /* default file operations */
268 
        NULL,                   /* create */
269 
        NULL,                   /* lookup */
270 
        NULL,                   /* link */
271 
        NULL,                   /* unlink */
272 
        NULL,                   /* symlink */
273 
        NULL,                   /* mkdir */
274 
        NULL,                   /* rmdir */
275 
        NULL,                   /* mknod */
276 
        NULL,                   /* rename */
277 
        NULL,                   /* readlink */
278 
        NULL,                   /* follow_link */
279 
        NULL,                   /* bmap */
280 
        NULL                    /* truncate */
281 
};

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