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/list.h>
36 #include <asm/uaccess.h>
37 #include <linux/idr.h>
46 * v9fs_file_open - open a file (or directory)
47 * @inode: inode to be opened
48 * @file: file being opened
52 int v9fs_file_open(struct inode *inode, struct file *file)
54 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
55 struct v9fs_fid *v9fid, *fid;
56 struct v9fs_fcall *fcall = NULL;
58 unsigned int iounit = 0;
62 dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file);
64 v9fid = v9fs_fid_get_created(file->f_dentry);
66 v9fid = v9fs_fid_lookup(file->f_dentry);
69 dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n");
73 if (!v9fid->fidcreate) {
74 fid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
76 dprintk(DEBUG_ERROR, "Out of Memory\n");
86 newfid = v9fs_get_idpool(&v9ses->fidpool);
88 eprintk(KERN_WARNING, "newfid fails!\n");
93 v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL, NULL);
96 v9fs_put_idpool(newfid, &v9ses->fidpool);
97 dprintk(DEBUG_ERROR, "rewalk didn't work\n");
103 /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
104 /* translate open mode appropriately */
105 open_mode = file->f_flags & 0x3;
107 if (file->f_flags & O_EXCL)
108 open_mode |= V9FS_OEXCL;
110 if (v9ses->extended) {
111 if (file->f_flags & O_TRUNC)
112 open_mode |= V9FS_OTRUNC;
114 if (file->f_flags & O_APPEND)
115 open_mode |= V9FS_OAPPEND;
118 result = v9fs_t_open(v9ses, newfid, open_mode, &fcall);
121 "open failed, open_mode 0x%x: %s\n", open_mode,
127 iounit = fcall->params.ropen.iounit;
132 iounit = v9fid->iounit;
133 v9fid->fidcreate = 0;
136 file->private_data = v9fid;
139 v9fid->rdir_fcall = NULL;
142 v9fid->iounit = iounit;
148 * v9fs_file_lock - lock a file (or directory)
149 * @inode: inode to be opened
150 * @file: file being opened
152 * XXX - this looks like a local only lock, we should extend into 9P
153 * by using open exclusive
156 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
159 struct inode *inode = filp->f_dentry->d_inode;
161 dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
163 /* No mandatory locks */
164 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
167 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
168 filemap_fdatawrite(inode->i_mapping);
169 filemap_fdatawait(inode->i_mapping);
170 invalidate_inode_pages(&inode->i_data);
177 * v9fs_file_read - read from a file
178 * @filep: file pointer to read
179 * @data: data buffer to read data into
180 * @count: size of buffer
181 * @offset: offset at which to read data
185 v9fs_file_read(struct file *filp, char __user * data, size_t count,
188 struct inode *inode = filp->f_dentry->d_inode;
189 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
190 struct v9fs_fid *v9f = filp->private_data;
191 struct v9fs_fcall *fcall = NULL;
198 dprintk(DEBUG_VFS, "\n");
200 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
201 if (v9f->iounit != 0 && rsize > v9f->iounit)
208 result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
211 printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
219 n = copy_to_user(data, fcall->params.rread.data, result);
221 dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n);
240 * v9fs_file_write - write to a file
241 * @filep: file pointer to write
242 * @data: data buffer to write data from
243 * @count: size of buffer
244 * @offset: offset at which to write data
249 v9fs_file_write(struct file *filp, const char __user * data,
250 size_t count, loff_t * offset)
252 struct inode *inode = filp->f_dentry->d_inode;
253 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
254 struct v9fs_fid *v9fid = filp->private_data;
255 struct v9fs_fcall *fcall;
256 int fid = v9fid->fid;
262 dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count,
264 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
265 if (v9fid->iounit != 0 && rsize > v9fid->iounit)
266 rsize = v9fid->iounit;
268 buf = kmalloc(v9ses->maxdata - V9FS_IOHDRSZ, GFP_KERNEL);
276 result = copy_from_user(buf, data, rsize);
278 dprintk(DEBUG_ERROR, "Problem copying from user\n");
283 dump_data(buf, rsize);
284 result = v9fs_t_write(v9ses, fid, *offset, rsize, buf, &fcall);
286 eprintk(KERN_ERR, "error while writing: %s(%d)\n",
287 FCALL_ERROR(fcall), result);
297 if (result != rsize) {
299 "short write: v9fs_t_write returned %d\n",
313 struct file_operations v9fs_file_operations = {
314 .llseek = generic_file_llseek,
315 .read = v9fs_file_read,
316 .write = v9fs_file_write,
317 .open = v9fs_file_open,
318 .release = v9fs_dir_release,
319 .lock = v9fs_file_lock,