2 * linux/fs/9p/vfs_file.c
4 * This file contians vfs file ops for 9P2000.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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.
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.
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
27 #include <linux/module.h>
28 #include <linux/errno.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>
47 * v9fs_file_open - open a file (or directory)
48 * @inode: inode to be opened
49 * @file: file being opened
53 int v9fs_file_open(struct inode *inode, struct file *file)
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;
60 unsigned int iounit = 0;
64 dprintk(DEBUG_VFS, "inode: %p file: %p v9fid= %p\n", inode, file,
68 struct dentry *dentry = file->f_dentry;
69 dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n");
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);
77 v9fid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
81 newfid = v9fs_get_idpool(&v9ses->fidpool);
83 eprintk(KERN_WARNING, "newfid fails!\n");
88 v9fs_t_walk(v9ses, v9fid->fid, newfid,
89 (char *)file->f_dentry->d_name.name, NULL);
91 v9fs_put_idpool(newfid, &v9ses->fidpool);
92 dprintk(DEBUG_ERROR, "rewalk didn't work\n");
96 v9fid = v9fs_fid_create(dentry);
98 dprintk(DEBUG_ERROR, "couldn't insert\n");
104 if (v9fid->fidcreate) {
107 iounit = v9fid->iounit;
108 v9fid->fidcreate = 0;
110 if (!S_ISDIR(inode->i_mode))
113 newfid = v9fs_get_idpool(&v9ses->fidpool);
115 eprintk(KERN_WARNING, "allocation failed\n");
118 /* This would be a somewhat critical clone */
120 v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL,
123 dprintk(DEBUG_ERROR, "clone error: %s\n",
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;
140 /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
141 /* translate open mode appropriately */
142 open_mode = file->f_flags & 0x3;
144 if (file->f_flags & O_EXCL)
145 open_mode |= V9FS_OEXCL;
147 if (v9ses->extended) {
148 if (file->f_flags & O_TRUNC)
149 open_mode |= V9FS_OTRUNC;
151 if (file->f_flags & O_APPEND)
152 open_mode |= V9FS_OAPPEND;
155 result = v9fs_t_open(v9ses, newfid, open_mode, &fcall);
158 "open failed, open_mode 0x%x: %s\n", open_mode,
164 iounit = fcall->params.ropen.iounit;
169 file->private_data = v9fid;
172 v9fid->rdir_fcall = NULL;
175 v9fid->iounit = iounit;
181 * v9fs_file_lock - lock a file (or directory)
182 * @inode: inode to be opened
183 * @file: file being opened
185 * XXX - this looks like a local only lock, we should extend into 9P
186 * by using open exclusive
189 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
192 struct inode *inode = filp->f_dentry->d_inode;
194 dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
196 /* No mandatory locks */
197 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
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);
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
219 v9fs_read(struct file *filp, char *buffer, size_t count, loff_t * offset)
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;
230 dprintk(DEBUG_VFS, "\n");
232 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
233 if (v9f->iounit != 0 && rsize > v9f->iounit)
240 result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
243 printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
251 /* XXX - extra copy */
252 memcpy(buffer, fcall->params.rread.data, result);
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
276 v9fs_file_read(struct file *filp, char __user * data, size_t count,
283 buffer = kmalloc(count, GFP_KERNEL);
287 retval = v9fs_read(filp, buffer, count, offset);
289 if ((ret = copy_to_user(data, buffer, retval)) != 0) {
290 dprintk(DEBUG_ERROR, "Problem copying to user %d\n",
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
311 v9fs_write(struct file *filp, char *buffer, size_t count, loff_t * offset)
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;
322 dprintk(DEBUG_VFS, "data %p count %d offset %x\n", buffer, (int)count,
324 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
325 if (v9fid->iounit != 0 && rsize > v9fid->iounit)
326 rsize = v9fid->iounit;
328 dump_data(buffer, count);
335 v9fs_t_write(v9ses, fid, *offset, rsize, buffer, &fcall);
337 eprintk(KERN_ERR, "error while writing: %s(%d)\n",
338 FCALL_ERROR(fcall), result);
346 if (result != rsize) {
348 "short write: v9fs_t_write returned %d\n",
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
371 v9fs_file_write(struct file *filp, const char __user * data,
372 size_t count, loff_t * offset)
377 buffer = kmalloc(count, GFP_KERNEL);
381 ret = copy_from_user(buffer, data, count);
383 dprintk(DEBUG_ERROR, "Problem copying from user\n");
386 ret = v9fs_write(filp, buffer, count, offset);
394 struct 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,