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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [ncpfs/] [file.c] - Blame information for rev 1275

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/*
 *  file.c
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *
 */
 
#include <asm/uaccess.h>
#include <asm/system.h>
 
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/locks.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
 
#include <linux/ncp_fs.h>
#include "ncplib_kernel.h"
 
static int ncp_fsync(struct file *file, struct dentry *dentry, int datasync)
{
        return 0;
}
 
/*
 * Open a file with the specified read/write mode.
 */
int ncp_make_open(struct inode *inode, int right)
{
        int error;
        int access;
 
        error = -EINVAL;
        if (!inode) {
                printk(KERN_ERR "ncp_make_open: got NULL inode\n");
                goto out;
        }
 
        DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
                atomic_read(&NCP_FINFO(inode)->opened),
                NCP_FINFO(inode)->volNumber,
                NCP_FINFO(inode)->dirEntNum);
        error = -EACCES;
        down(&NCP_FINFO(inode)->open_sem);
        if (!atomic_read(&NCP_FINFO(inode)->opened)) {
                struct ncp_entry_info finfo;
                int result;
 
                finfo.i.dirEntNum = NCP_FINFO(inode)->dirEntNum;
                finfo.i.volNumber = NCP_FINFO(inode)->volNumber;
                /* tries max. rights */
                finfo.access = O_RDWR;
                result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
                                        NULL, NULL, OC_MODE_OPEN,
                                        0, AR_READ | AR_WRITE, &finfo);
                if (!result)
                        goto update;
                /* RDWR did not succeeded, try readonly or writeonly as requested */
                switch (right) {
                        case O_RDONLY:
                                finfo.access = O_RDONLY;
                                result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
                                        NULL, NULL, OC_MODE_OPEN,
                                        0, AR_READ, &finfo);
                                break;
                        case O_WRONLY:
                                finfo.access = O_WRONLY;
                                result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
                                        NULL, NULL, OC_MODE_OPEN,
                                        0, AR_WRITE, &finfo);
                                break;
                }
                if (result) {
                        PPRINTK("ncp_make_open: failed, result=%d\n", result);
                        goto out_unlock;
                }
                /*
                 * Update the inode information.
                 */
        update:
                ncp_update_inode(inode, &finfo);
                atomic_set(&NCP_FINFO(inode)->opened, 1);
        }
 
        access = NCP_FINFO(inode)->access;
        PPRINTK("ncp_make_open: file open, access=%x\n", access);
        if (access == right || access == O_RDWR) {
                atomic_inc(&NCP_FINFO(inode)->opened);
                error = 0;
        }
 
out_unlock:
        up(&NCP_FINFO(inode)->open_sem);
out:
        return error;
}
 
static ssize_t
ncp_file_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
        struct dentry *dentry = file->f_dentry;
        struct inode *inode = dentry->d_inode;
        size_t already_read = 0;
        off_t pos;
        size_t bufsize;
        int error;
        void* freepage;
        size_t freelen;
 
        DPRINTK("ncp_file_read: enter %s/%s\n",
                dentry->d_parent->d_name.name, dentry->d_name.name);
 
        error = -EIO;
        if (!ncp_conn_valid(NCP_SERVER(inode)))
                goto out;
        error = -EINVAL;
        if (!S_ISREG(inode->i_mode)) {
                DPRINTK("ncp_file_read: read from non-file, mode %07o\n",
                        inode->i_mode);
                goto out;
        }
 
        pos = *ppos;
/* leave it out on server ...
        if (pos + count > inode->i_size) {
                count = inode->i_size - pos;
        }
*/
        error = 0;
        if (!count)     /* size_t is never < 0 */
                goto out;
 
        error = ncp_make_open(inode, O_RDONLY);
        if (error) {
                DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
                goto out;
        }
 
        bufsize = NCP_SERVER(inode)->buffer_size;
 
        error = -EIO;
        freelen = ncp_read_bounce_size(bufsize);
        freepage = vmalloc(freelen);
        if (!freepage)
                goto outrel;
        error = 0;
        /* First read in as much as possible for each bufsize. */
        while (already_read < count) {
                int read_this_time;
                size_t to_read = min_t(unsigned int,
                                     bufsize - (pos % bufsize),
                                     count - already_read);
 
                error = ncp_read_bounce(NCP_SERVER(inode),
                                NCP_FINFO(inode)->file_handle,
                                pos, to_read, buf, &read_this_time,
                                freepage, freelen);
                if (error) {
                        error = -EIO;   /* NW errno -> Linux errno */
                        break;
                }
                pos += read_this_time;
                buf += read_this_time;
                already_read += read_this_time;
 
                if (read_this_time != to_read) {
                        break;
                }
        }
        vfree(freepage);
 
        *ppos = pos;
 
        if (!IS_RDONLY(inode)) {
                inode->i_atime = CURRENT_TIME;
        }
 
        DPRINTK("ncp_file_read: exit %s/%s\n",
                dentry->d_parent->d_name.name, dentry->d_name.name);
outrel:
        ncp_inode_close(inode);
out:
        return already_read ? already_read : error;
}
 
static ssize_t
ncp_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
        struct dentry *dentry = file->f_dentry;
        struct inode *inode = dentry->d_inode;
        size_t already_written = 0;
        off_t pos;
        size_t bufsize;
        int errno;
        void* bouncebuffer;
 
        DPRINTK("ncp_file_write: enter %s/%s\n",
                dentry->d_parent->d_name.name, dentry->d_name.name);
        errno = -EIO;
        if (!ncp_conn_valid(NCP_SERVER(inode)))
                goto out;
        if (!S_ISREG(inode->i_mode)) {
                DPRINTK("ncp_file_write: write to non-file, mode %07o\n",
                        inode->i_mode);
                return -EINVAL;
        }
 
        errno = 0;
        if (!count)
                goto out;
        errno = ncp_make_open(inode, O_WRONLY);
        if (errno) {
                DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
                return errno;
        }
        pos = *ppos;
 
        if (file->f_flags & O_APPEND) {
                pos = inode->i_size;
        }
        bufsize = NCP_SERVER(inode)->buffer_size;
 
        already_written = 0;
 
        bouncebuffer = vmalloc(bufsize);
        if (!bouncebuffer) {
                errno = -EIO;   /* -ENOMEM */
                goto outrel;
        }
        while (already_written < count) {
                int written_this_time;
                size_t to_write = min_t(unsigned int,
                                      bufsize - (pos % bufsize),
                                      count - already_written);
 
                if (copy_from_user(bouncebuffer, buf, to_write)) {
                        errno = -EFAULT;
                        break;
                }
                if (ncp_write_kernel(NCP_SERVER(inode),
                    NCP_FINFO(inode)->file_handle,
                    pos, to_write, bouncebuffer, &written_this_time) != 0) {
                        errno = -EIO;
                        break;
                }
                pos += written_this_time;
                buf += written_this_time;
                already_written += written_this_time;
 
                if (written_this_time != to_write) {
                        break;
                }
        }
        vfree(bouncebuffer);
        inode->i_mtime = inode->i_atime = CURRENT_TIME;
 
        *ppos = pos;
 
        if (pos > inode->i_size) {
                inode->i_size = pos;
        }
        DPRINTK("ncp_file_write: exit %s/%s\n",
                dentry->d_parent->d_name.name, dentry->d_name.name);
outrel:
        ncp_inode_close(inode);
out:
        return already_written ? already_written : errno;
}
 
static int ncp_release(struct inode *inode, struct file *file) {
        if (ncp_make_closed(inode)) {
                DPRINTK("ncp_release: failed to close\n");
        }
        return 0;
}
 
struct file_operations ncp_file_operations =
{
        llseek:         generic_file_llseek,
        read:           ncp_file_read,
        write:          ncp_file_write,
        ioctl:          ncp_ioctl,
        mmap:           ncp_mmap,
        release:        ncp_release,
        fsync:          ncp_fsync,
};
 
struct inode_operations ncp_file_inode_operations =
{
        setattr:        ncp_notify_change,
};

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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [ncpfs/] [file.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* file.c`
3			`*`
4			`* Copyright (C) 1995, 1996 by Volker Lendecke`
5			`* Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache`
6			`*`
7			`*/`
8
9			`#include <asm/uaccess.h>`
10			`#include <asm/system.h>`
11
12			`#include <linux/sched.h>`
13			`#include <linux/kernel.h>`
14			`#include <linux/errno.h>`
15			`#include <linux/fcntl.h>`
16			`#include <linux/stat.h>`
17			`#include <linux/mm.h>`
18			`#include <linux/locks.h>`
19			`#include <linux/slab.h>`
20			`#include <linux/vmalloc.h>`
21
22			`#include <linux/ncp_fs.h>`
23			`#include "ncplib_kernel.h"`
24
25			`static int ncp_fsync(struct file file, struct dentry dentry, int datasync)`
26			`{`
27			`return 0;`
28			`}`
29
30			`/*`
31			`* Open a file with the specified read/write mode.`
32			`*/`
33			`int ncp_make_open(struct inode *inode, int right)`
34			`{`
35			`int error;`
36			`int access;`
37
38			`error = -EINVAL;`
39			`if (!inode) {`
40			`printk(KERN_ERR "ncp_make_open: got NULL inode\n");`
41			`goto out;`
42			`}`
43
44			`DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",`
45			`atomic_read(&NCP_FINFO(inode)->opened),`
46			`NCP_FINFO(inode)->volNumber,`
47			`NCP_FINFO(inode)->dirEntNum);`
48			`error = -EACCES;`
49			`down(&NCP_FINFO(inode)->open_sem);`
50			`if (!atomic_read(&NCP_FINFO(inode)->opened)) {`
51			`struct ncp_entry_info finfo;`
52			`int result;`
53
54			`finfo.i.dirEntNum = NCP_FINFO(inode)->dirEntNum;`
55			`finfo.i.volNumber = NCP_FINFO(inode)->volNumber;`
56			`/* tries max. rights */`
57			`finfo.access = O_RDWR;`
58			`result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),`
59			`NULL, NULL, OC_MODE_OPEN,`
60			`0, AR_READ \| AR_WRITE, &finfo);`
61			`if (!result)`
62			`goto update;`
63			`/* RDWR did not succeeded, try readonly or writeonly as requested */`
64			`switch (right) {`
65			`case O_RDONLY:`
66			`finfo.access = O_RDONLY;`
67			`result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),`
68			`NULL, NULL, OC_MODE_OPEN,`
69			`0, AR_READ, &finfo);`
70			`break;`
71			`case O_WRONLY:`
72			`finfo.access = O_WRONLY;`
73			`result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),`
74			`NULL, NULL, OC_MODE_OPEN,`
75			`0, AR_WRITE, &finfo);`
76			`break;`
77			`}`
78			`if (result) {`
79			`PPRINTK("ncp_make_open: failed, result=%d\n", result);`
80			`goto out_unlock;`
81			`}`
82			`/*`
83			`* Update the inode information.`
84			`*/`
85			`update:`
86			`ncp_update_inode(inode, &finfo);`
87			`atomic_set(&NCP_FINFO(inode)->opened, 1);`
88			`}`
89
90			`access = NCP_FINFO(inode)->access;`
91			`PPRINTK("ncp_make_open: file open, access=%x\n", access);`
92			`if (access == right \|\| access == O_RDWR) {`
93			`atomic_inc(&NCP_FINFO(inode)->opened);`
94			`error = 0;`
95			`}`
96
97			`out_unlock:`
98			`up(&NCP_FINFO(inode)->open_sem);`
99			`out:`
100			`return error;`
101			`}`
102
103			`static ssize_t`
104			`ncp_file_read(struct file file, char buf, size_t count, loff_t *ppos)`
105			`{`
106			`struct dentry *dentry = file->f_dentry;`
107			`struct inode *inode = dentry->d_inode;`
108			`size_t already_read = 0;`
109			`off_t pos;`
110			`size_t bufsize;`
111			`int error;`
112			`void* freepage;`
113			`size_t freelen;`
114
115			`DPRINTK("ncp_file_read: enter %s/%s\n",`
116			`dentry->d_parent->d_name.name, dentry->d_name.name);`
117
118			`error = -EIO;`
119			`if (!ncp_conn_valid(NCP_SERVER(inode)))`
120			`goto out;`
121			`error = -EINVAL;`
122			`if (!S_ISREG(inode->i_mode)) {`
123			`DPRINTK("ncp_file_read: read from non-file, mode %07o\n",`
124			`inode->i_mode);`
125			`goto out;`
126			`}`
127
128			`pos = *ppos;`
129			`/* leave it out on server ...`
130			`if (pos + count > inode->i_size) {`
131			`count = inode->i_size - pos;`
132			`}`
133			`*/`
134			`error = 0;`
135			`if (!count) /* size_t is never < 0 */`
136			`goto out;`
137
138			`error = ncp_make_open(inode, O_RDONLY);`
139			`if (error) {`
140			`DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);`
141			`goto out;`
142			`}`
143
144			`bufsize = NCP_SERVER(inode)->buffer_size;`
145
146			`error = -EIO;`
147			`freelen = ncp_read_bounce_size(bufsize);`
148			`freepage = vmalloc(freelen);`
149			`if (!freepage)`
150			`goto outrel;`
151			`error = 0;`
152			`/* First read in as much as possible for each bufsize. */`
153			`while (already_read < count) {`
154			`int read_this_time;`
155			`size_t to_read = min_t(unsigned int,`
156			`bufsize - (pos % bufsize),`
157			`count - already_read);`
158
159			`error = ncp_read_bounce(NCP_SERVER(inode),`
160			`NCP_FINFO(inode)->file_handle,`
161			`pos, to_read, buf, &read_this_time,`
162			`freepage, freelen);`
163			`if (error) {`
164			`error = -EIO; /* NW errno -> Linux errno */`
165			`break;`
166			`}`
167			`pos += read_this_time;`
168			`buf += read_this_time;`
169			`already_read += read_this_time;`
170
171			`if (read_this_time != to_read) {`
172			`break;`
173			`}`
174			`}`
175			`vfree(freepage);`
176
177			`*ppos = pos;`
178
179			`if (!IS_RDONLY(inode)) {`
180			`inode->i_atime = CURRENT_TIME;`
181			`}`
182
183			`DPRINTK("ncp_file_read: exit %s/%s\n",`
184			`dentry->d_parent->d_name.name, dentry->d_name.name);`
185			`outrel:`
186			`ncp_inode_close(inode);`
187			`out:`
188			`return already_read ? already_read : error;`
189			`}`
190
191			`static ssize_t`
192			`ncp_file_write(struct file file, const char buf, size_t count, loff_t *ppos)`
193			`{`
194			`struct dentry *dentry = file->f_dentry;`
195			`struct inode *inode = dentry->d_inode;`
196			`size_t already_written = 0;`
197			`off_t pos;`
198			`size_t bufsize;`
199			`int errno;`
200			`void* bouncebuffer;`
201
202			`DPRINTK("ncp_file_write: enter %s/%s\n",`
203			`dentry->d_parent->d_name.name, dentry->d_name.name);`
204			`errno = -EIO;`
205			`if (!ncp_conn_valid(NCP_SERVER(inode)))`
206			`goto out;`
207			`if (!S_ISREG(inode->i_mode)) {`
208			`DPRINTK("ncp_file_write: write to non-file, mode %07o\n",`
209			`inode->i_mode);`
210			`return -EINVAL;`
211			`}`
212
213			`errno = 0;`
214			`if (!count)`
215			`goto out;`
216			`errno = ncp_make_open(inode, O_WRONLY);`
217			`if (errno) {`
218			`DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);`
219			`return errno;`
220			`}`
221			`pos = *ppos;`
222
223			`if (file->f_flags & O_APPEND) {`
224			`pos = inode->i_size;`
225			`}`
226			`bufsize = NCP_SERVER(inode)->buffer_size;`
227
228			`already_written = 0;`
229
230			`bouncebuffer = vmalloc(bufsize);`
231			`if (!bouncebuffer) {`
232			`errno = -EIO; /* -ENOMEM */`
233			`goto outrel;`
234			`}`
235			`while (already_written < count) {`
236			`int written_this_time;`
237			`size_t to_write = min_t(unsigned int,`
238			`bufsize - (pos % bufsize),`
239			`count - already_written);`
240
241			`if (copy_from_user(bouncebuffer, buf, to_write)) {`
242			`errno = -EFAULT;`
243			`break;`
244			`}`
245			`if (ncp_write_kernel(NCP_SERVER(inode),`
246			`NCP_FINFO(inode)->file_handle,`
247			`pos, to_write, bouncebuffer, &written_this_time) != 0) {`
248			`errno = -EIO;`
249			`break;`
250			`}`
251			`pos += written_this_time;`
252			`buf += written_this_time;`
253			`already_written += written_this_time;`
254
255			`if (written_this_time != to_write) {`
256			`break;`
257			`}`
258			`}`
259			`vfree(bouncebuffer);`
260			`inode->i_mtime = inode->i_atime = CURRENT_TIME;`
261
262			`*ppos = pos;`
263
264			`if (pos > inode->i_size) {`
265			`inode->i_size = pos;`
266			`}`
267			`DPRINTK("ncp_file_write: exit %s/%s\n",`
268			`dentry->d_parent->d_name.name, dentry->d_name.name);`
269			`outrel:`
270			`ncp_inode_close(inode);`
271			`out:`
272			`return already_written ? already_written : errno;`
273			`}`
274
275			`static int ncp_release(struct inode inode, struct file file) {`
276			`if (ncp_make_closed(inode)) {`
277			`DPRINTK("ncp_release: failed to close\n");`
278			`}`
279			`return 0;`
280			`}`
281
282			`struct file_operations ncp_file_operations =`
283			`{`
284			`llseek: generic_file_llseek,`
285			`read: ncp_file_read,`
286			`write: ncp_file_write,`
287			`ioctl: ncp_ioctl,`
288			`mmap: ncp_mmap,`
289			`release: ncp_release,`
290			`fsync: ncp_fsync,`
291			`};`
292
293			`struct inode_operations ncp_file_inode_operations =`
294			`{`
295			`setattr: ncp_notify_change,`
296			`};`