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, *fid;
57 struct v9fs_fcall *fcall = NULL;
59 unsigned int iounit = 0;
63 dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file);
65 v9fid = v9fs_fid_get_created(file->f_dentry);
67 v9fid = v9fs_fid_lookup(file->f_dentry);
70 dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n");
74 if (!v9fid->fidcreate) {
75 fid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
77 dprintk(DEBUG_ERROR, "Out of Memory\n");
87 newfid = v9fs_get_idpool(&v9ses->fidpool);
89 eprintk(KERN_WARNING, "newfid fails!\n");
94 v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL, NULL);
97 v9fs_put_idpool(newfid, &v9ses->fidpool);
98 dprintk(DEBUG_ERROR, "rewalk didn't work\n");
104 /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
105 /* translate open mode appropriately */
106 open_mode = file->f_flags & 0x3;
108 if (file->f_flags & O_EXCL)
109 open_mode |= V9FS_OEXCL;
111 if (v9ses->extended) {
112 if (file->f_flags & O_TRUNC)
113 open_mode |= V9FS_OTRUNC;
115 if (file->f_flags & O_APPEND)
116 open_mode |= V9FS_OAPPEND;
119 result = v9fs_t_open(v9ses, newfid, open_mode, &fcall);
122 "open failed, open_mode 0x%x: %s\n", open_mode,
128 iounit = fcall->params.ropen.iounit;
133 iounit = v9fid->iounit;
134 v9fid->fidcreate = 0;
137 file->private_data = v9fid;
140 v9fid->rdir_fcall = NULL;
143 v9fid->iounit = iounit;
149 * v9fs_file_lock - lock a file (or directory)
150 * @inode: inode to be opened
151 * @file: file being opened
153 * XXX - this looks like a local only lock, we should extend into 9P
154 * by using open exclusive
157 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
160 struct inode *inode = filp->f_dentry->d_inode;
162 dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
164 /* No mandatory locks */
165 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
168 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
169 filemap_fdatawrite(inode->i_mapping);
170 filemap_fdatawait(inode->i_mapping);
171 invalidate_inode_pages(&inode->i_data);
178 * v9fs_file_read - read from a file
179 * @filep: file pointer to read
180 * @data: data buffer to read data into
181 * @count: size of buffer
182 * @offset: offset at which to read data
186 v9fs_file_read(struct file *filp, char __user * data, size_t count,
189 struct inode *inode = filp->f_dentry->d_inode;
190 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
191 struct v9fs_fid *v9f = filp->private_data;
192 struct v9fs_fcall *fcall = NULL;
199 dprintk(DEBUG_VFS, "\n");
201 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
202 if (v9f->iounit != 0 && rsize > v9f->iounit)
209 result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
212 printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
220 n = copy_to_user(data, fcall->params.rread.data, result);
222 dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n);
241 * v9fs_file_write - write to a file
242 * @filep: file pointer to write
243 * @data: data buffer to write data from
244 * @count: size of buffer
245 * @offset: offset at which to write data
250 v9fs_file_write(struct file *filp, const char __user * data,
251 size_t count, loff_t * offset)
253 struct inode *inode = filp->f_dentry->d_inode;
254 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
255 struct v9fs_fid *v9fid = filp->private_data;
256 struct v9fs_fcall *fcall;
257 int fid = v9fid->fid;
263 dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count,
265 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
266 if (v9fid->iounit != 0 && rsize > v9fid->iounit)
267 rsize = v9fid->iounit;
269 buf = kmalloc(v9ses->maxdata - V9FS_IOHDRSZ, GFP_KERNEL);
277 result = copy_from_user(buf, data, rsize);
279 dprintk(DEBUG_ERROR, "Problem copying from user\n");
284 dump_data(buf, rsize);
285 result = v9fs_t_write(v9ses, fid, *offset, rsize, buf, &fcall);
287 eprintk(KERN_ERR, "error while writing: %s(%d)\n",
288 FCALL_ERROR(fcall), result);
298 if (result != rsize) {
300 "short write: v9fs_t_write returned %d\n",
314 struct file_operations v9fs_file_operations = {
315 .llseek = generic_file_llseek,
316 .read = v9fs_file_read,
317 .write = v9fs_file_write,
318 .open = v9fs_file_open,
319 .release = v9fs_dir_release,
320 .lock = v9fs_file_lock,