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authorEric Van Hensbergen <ericvh@gmail.com>2005-09-09 16:04:18 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 16:57:56 -0400
commite69e7fe5b0c86b7271045444a3a681136234c659 (patch)
tree3ced44a52b09e6414501f686a12f77ca09bbd067 /fs
parent93fa58cb831337fdf5d36b3b913441100a484dae (diff)
[PATCH] v9fs: VFS file, dentry, and directory operations
This part of the patch contains the VFS file, dentry & directory interfaces. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/9p/vfs_dentry.c126
-rw-r--r--fs/9p/vfs_dir.c226
-rw-r--r--fs/9p/vfs_file.c401
3 files changed, 753 insertions, 0 deletions
diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
new file mode 100644
index 000000000000..306c96741f81
--- /dev/null
+++ b/fs/9p/vfs_dentry.c
@@ -0,0 +1,126 @@
1/*
2 * linux/fs/9p/vfs_dentry.c
3 *
4 * This file contians vfs dentry ops for the 9P2000 protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/module.h>
28#include <linux/errno.h>
29#include <linux/fs.h>
30#include <linux/file.h>
31#include <linux/pagemap.h>
32#include <linux/stat.h>
33#include <linux/string.h>
34#include <linux/smp_lock.h>
35#include <linux/inet.h>
36#include <linux/namei.h>
37#include <linux/idr.h>
38
39#include "debug.h"
40#include "v9fs.h"
41#include "9p.h"
42#include "v9fs_vfs.h"
43#include "conv.h"
44#include "fid.h"
45
46/**
47 * v9fs_dentry_validate - VFS dcache hook to validate cache
48 * @dentry: dentry that is being validated
49 * @nd: path data
50 *
51 * dcache really shouldn't be used for 9P2000 as at all due to
52 * potential attached semantics to directory traversal (walk).
53 *
54 * FUTURE: look into how to use dcache to allow multi-stage
55 * walks in Plan 9 & potential for better dcache operation which
56 * would remain valid for Plan 9 semantics. Older versions
57 * had validation via stat for those interested. However, since
58 * stat has the same approximate overhead as walk there really
59 * is no difference. The only improvement would be from a
60 * time-decay cache like NFS has and that undermines the
61 * synchronous nature of 9P2000.
62 *
63 */
64
65static int v9fs_dentry_validate(struct dentry *dentry, struct nameidata *nd)
66{
67 struct dentry *dc = current->fs->pwd;
68
69 dprintk(DEBUG_VFS, "dentry: %s (%p)\n", dentry->d_iname, dentry);
70 if (v9fs_fid_lookup(dentry, FID_OP)) {
71 dprintk(DEBUG_VFS, "VALID\n");
72 return 1;
73 }
74
75 while (dc != NULL) {
76 if (dc == dentry) {
77 dprintk(DEBUG_VFS, "VALID\n");
78 return 1;
79 }
80 if (dc == dc->d_parent)
81 break;
82
83 dc = dc->d_parent;
84 }
85
86 dprintk(DEBUG_VFS, "INVALID\n");
87 return 0;
88}
89
90/**
91 * v9fs_dentry_release - called when dentry is going to be freed
92 * @dentry: dentry that is being release
93 *
94 */
95
96void v9fs_dentry_release(struct dentry *dentry)
97{
98 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
99
100 if (dentry->d_fsdata != NULL) {
101 struct list_head *fid_list = dentry->d_fsdata;
102 struct v9fs_fid *temp = NULL;
103 struct v9fs_fid *current_fid = NULL;
104 struct v9fs_fcall *fcall = NULL;
105
106 list_for_each_entry_safe(current_fid, temp, fid_list, list) {
107 if (v9fs_t_clunk
108 (current_fid->v9ses, current_fid->fid, &fcall))
109 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
110 FCALL_ERROR(fcall));
111
112 v9fs_put_idpool(current_fid->fid,
113 &current_fid->v9ses->fidpool);
114
115 kfree(fcall);
116 v9fs_fid_destroy(current_fid);
117 }
118
119 kfree(dentry->d_fsdata); /* free the list_head */
120 }
121}
122
123struct dentry_operations v9fs_dentry_operations = {
124 .d_revalidate = v9fs_dentry_validate,
125 .d_release = v9fs_dentry_release,
126};
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
new file mode 100644
index 000000000000..c478a7384186
--- /dev/null
+++ b/fs/9p/vfs_dir.c
@@ -0,0 +1,226 @@
1/*
2 * linux/fs/9p/vfs_dir.c
3 *
4 * This file contains vfs directory ops for the 9P2000 protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/module.h>
28#include <linux/errno.h>
29#include <linux/fs.h>
30#include <linux/file.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/smp_lock.h>
34#include <linux/inet.h>
35#include <linux/idr.h>
36
37#include "debug.h"
38#include "v9fs.h"
39#include "9p.h"
40#include "v9fs_vfs.h"
41#include "conv.h"
42#include "fid.h"
43
44/**
45 * dt_type - return file type
46 * @mistat: mistat structure
47 *
48 */
49
50static inline int dt_type(struct v9fs_stat *mistat)
51{
52 unsigned long perm = mistat->mode;
53 int rettype = DT_REG;
54
55 if (perm & V9FS_DMDIR)
56 rettype = DT_DIR;
57 if (perm & V9FS_DMSYMLINK)
58 rettype = DT_LNK;
59
60 return rettype;
61}
62
63/**
64 * v9fs_dir_readdir - read a directory
65 * @filep: opened file structure
66 * @dirent: directory structure ???
67 * @filldir: function to populate directory structure ???
68 *
69 */
70
71static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
72{
73 struct v9fs_fcall *fcall = NULL;
74 struct inode *inode = filp->f_dentry->d_inode;
75 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
76 struct v9fs_fid *file = filp->private_data;
77 unsigned int i, n;
78 int fid = -1;
79 int ret = 0;
80 struct v9fs_stat *mi = NULL;
81 int over = 0;
82
83 dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name);
84
85 fid = file->fid;
86
87 mi = kmalloc(v9ses->maxdata, GFP_KERNEL);
88 if (!mi)
89 return -ENOMEM;
90
91 if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
92 kfree(file->rdir_fcall);
93 file->rdir_fcall = NULL;
94 }
95
96 if (file->rdir_fcall) {
97 n = file->rdir_fcall->params.rread.count;
98 i = file->rdir_fpos;
99 while (i < n) {
100 int s = v9fs_deserialize_stat(v9ses,
101 file->rdir_fcall->params.rread.data + i,
102 n - i, mi, v9ses->maxdata);
103
104 if (s == 0) {
105 dprintk(DEBUG_ERROR,
106 "error while deserializing mistat\n");
107 ret = -EIO;
108 goto FreeStructs;
109 }
110
111 over = filldir(dirent, mi->name, strlen(mi->name),
112 filp->f_pos, v9fs_qid2ino(&mi->qid),
113 dt_type(mi));
114
115 if (over) {
116 file->rdir_fpos = i;
117 file->rdir_pos = filp->f_pos;
118 break;
119 }
120
121 i += s;
122 filp->f_pos += s;
123 }
124
125 if (!over) {
126 kfree(file->rdir_fcall);
127 file->rdir_fcall = NULL;
128 }
129 }
130
131 while (!over) {
132 ret = v9fs_t_read(v9ses, fid, filp->f_pos,
133 v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
134 if (ret < 0) {
135 dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
136 ret, fcall);
137 goto FreeStructs;
138 } else if (ret == 0)
139 break;
140
141 n = ret;
142 i = 0;
143 while (i < n) {
144 int s = v9fs_deserialize_stat(v9ses,
145 fcall->params.rread.data + i, n - i, mi,
146 v9ses->maxdata);
147
148 if (s == 0) {
149 dprintk(DEBUG_ERROR,
150 "error while deserializing mistat\n");
151 return -EIO;
152 }
153
154 over = filldir(dirent, mi->name, strlen(mi->name),
155 filp->f_pos, v9fs_qid2ino(&mi->qid),
156 dt_type(mi));
157
158 if (over) {
159 file->rdir_fcall = fcall;
160 file->rdir_fpos = i;
161 file->rdir_pos = filp->f_pos;
162 fcall = NULL;
163 break;
164 }
165
166 i += s;
167 filp->f_pos += s;
168 }
169
170 kfree(fcall);
171 }
172
173 FreeStructs:
174 kfree(fcall);
175 kfree(mi);
176 return ret;
177}
178
179/**
180 * v9fs_dir_release - close a directory
181 * @inode: inode of the directory
182 * @filp: file pointer to a directory
183 *
184 */
185
186int v9fs_dir_release(struct inode *inode, struct file *filp)
187{
188 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
189 struct v9fs_fid *fid = filp->private_data;
190 int fidnum = -1;
191
192 dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp,
193 fid->fid);
194 fidnum = fid->fid;
195
196 filemap_fdatawrite(inode->i_mapping);
197 filemap_fdatawait(inode->i_mapping);
198
199 if (fidnum >= 0) {
200 fid->fidopen--;
201 dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
202 fid->fid);
203
204 if (fid->fidopen == 0) {
205 if (v9fs_t_clunk(v9ses, fidnum, NULL))
206 dprintk(DEBUG_ERROR, "clunk failed\n");
207
208 v9fs_put_idpool(fid->fid, &v9ses->fidpool);
209 }
210
211 kfree(fid->rdir_fcall);
212
213 filp->private_data = NULL;
214 v9fs_fid_destroy(fid);
215 }
216
217 d_drop(filp->f_dentry);
218 return 0;
219}
220
221struct file_operations v9fs_dir_operations = {
222 .read = generic_read_dir,
223 .readdir = v9fs_dir_readdir,
224 .open = v9fs_file_open,
225 .release = v9fs_dir_release,
226};
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
new file mode 100644
index 000000000000..1f8ae7d580ab
--- /dev/null
+++ b/fs/9p/vfs_file.c
@@ -0,0 +1,401 @@
1/*
2 * linux/fs/9p/vfs_file.c
3 *
4 * This file contians vfs file ops for 9P2000.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/module.h>
28#include <linux/errno.h>
29#include <linux/fs.h>
30#include <linux/file.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/smp_lock.h>
34#include <linux/inet.h>
35#include <linux/version.h>
36#include <linux/list.h>
37#include <asm/uaccess.h>
38#include <linux/idr.h>
39
40#include "debug.h"
41#include "v9fs.h"
42#include "9p.h"
43#include "v9fs_vfs.h"
44#include "fid.h"
45
46/**
47 * v9fs_file_open - open a file (or directory)
48 * @inode: inode to be opened
49 * @file: file being opened
50 *
51 */
52
53int v9fs_file_open(struct inode *inode, struct file *file)
54{
55 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
56 struct v9fs_fid *v9fid = v9fs_fid_lookup(file->f_dentry, FID_WALK);
57 struct v9fs_fid *v9newfid = NULL;
58 struct v9fs_fcall *fcall = NULL;
59 int open_mode = 0;
60 unsigned int iounit = 0;
61 int newfid = -1;
62 long result = -1;
63
64 dprintk(DEBUG_VFS, "inode: %p file: %p v9fid= %p\n", inode, file,
65 v9fid);
66
67 if (!v9fid) {
68 struct dentry *dentry = file->f_dentry;
69 dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n");
70
71 /* XXX - some duplication from lookup, generalize later */
72 /* basically vfs_lookup is too heavy weight */
73 v9fid = v9fs_fid_lookup(file->f_dentry, FID_OP);
74 if (!v9fid)
75 return -EBADF;
76
77 v9fid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
78 if (!v9fid)
79 return -EBADF;
80
81 newfid = v9fs_get_idpool(&v9ses->fidpool);
82 if (newfid < 0) {
83 eprintk(KERN_WARNING, "newfid fails!\n");
84 return -ENOSPC;
85 }
86
87 result =
88 v9fs_t_walk(v9ses, v9fid->fid, newfid,
89 (char *)file->f_dentry->d_name.name, NULL);
90 if (result < 0) {
91 v9fs_put_idpool(newfid, &v9ses->fidpool);
92 dprintk(DEBUG_ERROR, "rewalk didn't work\n");
93 return -EBADF;
94 }
95
96 v9fid = v9fs_fid_create(dentry);
97 if (v9fid == NULL) {
98 dprintk(DEBUG_ERROR, "couldn't insert\n");
99 return -ENOMEM;
100 }
101 v9fid->fid = newfid;
102 }
103
104 if (v9fid->fidcreate) {
105 /* create case */
106 newfid = v9fid->fid;
107 iounit = v9fid->iounit;
108 v9fid->fidcreate = 0;
109 } else {
110 if (!S_ISDIR(inode->i_mode))
111 newfid = v9fid->fid;
112 else {
113 newfid = v9fs_get_idpool(&v9ses->fidpool);
114 if (newfid < 0) {
115 eprintk(KERN_WARNING, "allocation failed\n");
116 return -ENOSPC;
117 }
118 /* This would be a somewhat critical clone */
119 result =
120 v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL,
121 &fcall);
122 if (result < 0) {
123 dprintk(DEBUG_ERROR, "clone error: %s\n",
124 FCALL_ERROR(fcall));
125 kfree(fcall);
126 return result;
127 }
128
129 v9newfid = v9fs_fid_create(file->f_dentry);
130 v9newfid->fid = newfid;
131 v9newfid->qid = v9fid->qid;
132 v9newfid->iounit = v9fid->iounit;
133 v9newfid->fidopen = 0;
134 v9newfid->fidclunked = 0;
135 v9newfid->v9ses = v9ses;
136 v9fid = v9newfid;
137 kfree(fcall);
138 }
139
140 /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
141 /* translate open mode appropriately */
142 open_mode = file->f_flags & 0x3;
143
144 if (file->f_flags & O_EXCL)
145 open_mode |= V9FS_OEXCL;
146
147 if (v9ses->extended) {
148 if (file->f_flags & O_TRUNC)
149 open_mode |= V9FS_OTRUNC;
150
151 if (file->f_flags & O_APPEND)
152 open_mode |= V9FS_OAPPEND;
153 }
154
155 result = v9fs_t_open(v9ses, newfid, open_mode, &fcall);
156 if (result < 0) {
157 dprintk(DEBUG_ERROR,
158 "open failed, open_mode 0x%x: %s\n", open_mode,
159 FCALL_ERROR(fcall));
160 kfree(fcall);
161 return result;
162 }
163
164 iounit = fcall->params.ropen.iounit;
165 kfree(fcall);
166 }
167
168
169 file->private_data = v9fid;
170
171 v9fid->rdir_pos = 0;
172 v9fid->rdir_fcall = NULL;
173 v9fid->fidopen = 1;
174 v9fid->filp = file;
175 v9fid->iounit = iounit;
176
177 return 0;
178}
179
180/**
181 * v9fs_file_lock - lock a file (or directory)
182 * @inode: inode to be opened
183 * @file: file being opened
184 *
185 * XXX - this looks like a local only lock, we should extend into 9P
186 * by using open exclusive
187 */
188
189static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
190{
191 int res = 0;
192 struct inode *inode = filp->f_dentry->d_inode;
193
194 dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
195
196 /* No mandatory locks */
197 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
198 return -ENOLCK;
199
200 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
201 filemap_fdatawrite(inode->i_mapping);
202 filemap_fdatawait(inode->i_mapping);
203 invalidate_inode_pages(&inode->i_data);
204 }
205
206 return res;
207}
208
209/**
210 * v9fs_read - read from a file (internal)
211 * @filep: file pointer to read
212 * @data: data buffer to read data into
213 * @count: size of buffer
214 * @offset: offset at which to read data
215 *
216 */
217
218static ssize_t
219v9fs_read(struct file *filp, char *buffer, size_t count, loff_t * offset)
220{
221 struct inode *inode = filp->f_dentry->d_inode;
222 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
223 struct v9fs_fid *v9f = filp->private_data;
224 struct v9fs_fcall *fcall = NULL;
225 int fid = v9f->fid;
226 int rsize = 0;
227 int result = 0;
228 int total = 0;
229
230 dprintk(DEBUG_VFS, "\n");
231
232 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
233 if (v9f->iounit != 0 && rsize > v9f->iounit)
234 rsize = v9f->iounit;
235
236 do {
237 if (count < rsize)
238 rsize = count;
239
240 result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
241
242 if (result < 0) {
243 printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
244 result);
245
246 kfree(fcall);
247 return total;
248 } else
249 *offset += result;
250
251 /* XXX - extra copy */
252 memcpy(buffer, fcall->params.rread.data, result);
253 count -= result;
254 buffer += result;
255 total += result;
256
257 kfree(fcall);
258
259 if (result < rsize)
260 break;
261 } while (count);
262
263 return total;
264}
265
266/**
267 * v9fs_file_read - read from a file
268 * @filep: file pointer to read
269 * @data: data buffer to read data into
270 * @count: size of buffer
271 * @offset: offset at which to read data
272 *
273 */
274
275static ssize_t
276v9fs_file_read(struct file *filp, char __user * data, size_t count,
277 loff_t * offset)
278{
279 int retval = -1;
280 int ret = 0;
281 char *buffer;
282
283 buffer = kmalloc(count, GFP_KERNEL);
284 if (!buffer)
285 return -ENOMEM;
286
287 retval = v9fs_read(filp, buffer, count, offset);
288 if (retval > 0) {
289 if ((ret = copy_to_user(data, buffer, retval)) != 0) {
290 dprintk(DEBUG_ERROR, "Problem copying to user %d\n",
291 ret);
292 retval = ret;
293 }
294 }
295
296 kfree(buffer);
297
298 return retval;
299}
300
301/**
302 * v9fs_write - write to a file
303 * @filep: file pointer to write
304 * @data: data buffer to write data from
305 * @count: size of buffer
306 * @offset: offset at which to write data
307 *
308 */
309
310static ssize_t
311v9fs_write(struct file *filp, char *buffer, size_t count, loff_t * offset)
312{
313 struct inode *inode = filp->f_dentry->d_inode;
314 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
315 struct v9fs_fid *v9fid = filp->private_data;
316 struct v9fs_fcall *fcall;
317 int fid = v9fid->fid;
318 int result = -EIO;
319 int rsize = 0;
320 int total = 0;
321
322 dprintk(DEBUG_VFS, "data %p count %d offset %x\n", buffer, (int)count,
323 (int)*offset);
324 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
325 if (v9fid->iounit != 0 && rsize > v9fid->iounit)
326 rsize = v9fid->iounit;
327
328 dump_data(buffer, count);
329
330 do {
331 if (count < rsize)
332 rsize = count;
333
334 result =
335 v9fs_t_write(v9ses, fid, *offset, rsize, buffer, &fcall);
336 if (result < 0) {
337 eprintk(KERN_ERR, "error while writing: %s(%d)\n",
338 FCALL_ERROR(fcall), result);
339 kfree(fcall);
340 return result;
341 } else
342 *offset += result;
343
344 kfree(fcall);
345
346 if (result != rsize) {
347 eprintk(KERN_ERR,
348 "short write: v9fs_t_write returned %d\n",
349 result);
350 break;
351 }
352
353 count -= result;
354 buffer += result;
355 total += result;
356 } while (count);
357
358 return total;
359}
360
361/**
362 * v9fs_file_write - write to a file
363 * @filep: file pointer to write
364 * @data: data buffer to write data from
365 * @count: size of buffer
366 * @offset: offset at which to write data
367 *
368 */
369
370static ssize_t
371v9fs_file_write(struct file *filp, const char __user * data,
372 size_t count, loff_t * offset)
373{
374 int ret = -1;
375 char *buffer;
376
377 buffer = kmalloc(count, GFP_KERNEL);
378 if (buffer == NULL)
379 return -ENOMEM;
380
381 ret = copy_from_user(buffer, data, count);
382 if (ret) {
383 dprintk(DEBUG_ERROR, "Problem copying from user\n");
384 ret = -EFAULT;
385 } else {
386 ret = v9fs_write(filp, buffer, count, offset);
387 }
388
389 kfree(buffer);
390
391 return ret;
392}
393
394struct file_operations v9fs_file_operations = {
395 .llseek = generic_file_llseek,
396 .read = v9fs_file_read,
397 .write = v9fs_file_write,
398 .open = v9fs_file_open,
399 .release = v9fs_dir_release,
400 .lock = v9fs_file_lock,
401};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-24 02:45:02 -0500