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 version 2
11 * as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/sched.h>
30 #include <linux/file.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/list.h>
35 #include <linux/pagemap.h>
36 #include <asm/uaccess.h>
37 #include <linux/idr.h>
38 #include <net/9p/9p.h>
39 #include <net/9p/client.h>
46 static const struct file_operations v9fs_cached_file_operations;
47 static const struct file_operations v9fs_cached_file_operations_dotl;
50 * v9fs_file_open - open a file (or directory)
51 * @inode: inode to be opened
52 * @file: file being opened
56 int v9fs_file_open(struct inode *inode, struct file *file)
59 struct v9fs_session_info *v9ses;
63 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
64 v9ses = v9fs_inode2v9ses(inode);
65 if (v9fs_proto_dotl(v9ses))
66 omode = file->f_flags;
68 omode = v9fs_uflags2omode(file->f_flags,
69 v9fs_proto_dotu(v9ses));
70 fid = file->private_data;
72 fid = v9fs_fid_clone(file->f_path.dentry);
76 err = p9_client_open(fid, omode);
81 if (file->f_flags & O_TRUNC) {
82 i_size_write(inode, 0);
85 if ((file->f_flags & O_APPEND) &&
86 (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
87 generic_file_llseek(file, 0, SEEK_END);
90 file->private_data = fid;
91 if ((fid->qid.version) && (v9ses->cache)) {
92 P9_DPRINTK(P9_DEBUG_VFS, "cached");
93 /* enable cached file options */
94 if(file->f_op == &v9fs_file_operations)
95 file->f_op = &v9fs_cached_file_operations;
96 else if (file->f_op == &v9fs_file_operations_dotl)
97 file->f_op = &v9fs_cached_file_operations_dotl;
99 #ifdef CONFIG_9P_FSCACHE
100 v9fs_cache_inode_set_cookie(inode, file);
108 * v9fs_file_lock - lock a file (or directory)
109 * @filp: file to be locked
111 * @fl: file lock structure
113 * Bugs: this looks like a local only lock, we should extend into 9P
114 * by using open exclusive
117 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
120 struct inode *inode = filp->f_path.dentry->d_inode;
122 P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
124 /* No mandatory locks */
125 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
128 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
129 filemap_write_and_wait(inode->i_mapping);
130 invalidate_mapping_pages(&inode->i_data, 0, -1);
137 * v9fs_file_readn - read from a file
138 * @filp: file pointer to read
139 * @data: data buffer to read data into
140 * @udata: user data buffer to read data into
141 * @count: size of buffer
142 * @offset: offset at which to read data
147 v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
151 struct p9_fid *fid = filp->private_data;
153 P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid,
154 (long long unsigned) offset, count);
158 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
160 n = p9_client_read(fid, data, udata, offset, count);
172 } while (count > 0 && n == size);
181 * v9fs_file_read - read from a file
182 * @filp: file pointer to read
183 * @udata: user data buffer to read data into
184 * @count: size of buffer
185 * @offset: offset at which to read data
190 v9fs_file_read(struct file *filp, char __user *udata, size_t count,
197 P9_DPRINTK(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
198 fid = filp->private_data;
200 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
202 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
204 ret = p9_client_read(fid, NULL, udata, *offset, count);
213 * v9fs_file_write - write to a file
214 * @filp: file pointer to write
215 * @data: data buffer to write data from
216 * @count: size of buffer
217 * @offset: offset at which to write data
222 v9fs_file_write(struct file *filp, const char __user * data,
223 size_t count, loff_t * offset)
229 struct p9_client *clnt;
230 struct inode *inode = filp->f_path.dentry->d_inode;
231 loff_t origin = *offset;
232 unsigned long pg_start, pg_end;
234 P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
235 (int)count, (int)*offset);
237 fid = filp->private_data;
240 retval = generic_write_checks(filp, &origin, &count, 0);
245 if ((ssize_t) count < 0)
252 n = p9_client_write(fid, NULL, data+total, origin+total, count);
260 pg_start = origin >> PAGE_CACHE_SHIFT;
261 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
262 if (inode->i_mapping && inode->i_mapping->nrpages)
263 invalidate_inode_pages2_range(inode->i_mapping,
266 i_size_write(inode, i_size_read(inode) + total);
267 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
278 static int v9fs_file_fsync(struct file *filp, int datasync)
281 struct p9_wstat wstat;
284 P9_DPRINTK(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
286 fid = filp->private_data;
287 v9fs_blank_wstat(&wstat);
289 retval = p9_client_wstat(fid, &wstat);
293 static const struct file_operations v9fs_cached_file_operations = {
294 .llseek = generic_file_llseek,
295 .read = do_sync_read,
296 .aio_read = generic_file_aio_read,
297 .write = v9fs_file_write,
298 .open = v9fs_file_open,
299 .release = v9fs_dir_release,
300 .lock = v9fs_file_lock,
301 .mmap = generic_file_readonly_mmap,
302 .fsync = v9fs_file_fsync,
305 static const struct file_operations v9fs_cached_file_operations_dotl = {
306 .llseek = generic_file_llseek,
307 .read = do_sync_read,
308 .aio_read = generic_file_aio_read,
309 .write = v9fs_file_write,
310 .open = v9fs_file_open,
311 .release = v9fs_dir_release,
312 .lock = v9fs_file_lock,
313 .mmap = generic_file_readonly_mmap,
314 .fsync = v9fs_file_fsync,
317 const struct file_operations v9fs_file_operations = {
318 .llseek = generic_file_llseek,
319 .read = v9fs_file_read,
320 .write = v9fs_file_write,
321 .open = v9fs_file_open,
322 .release = v9fs_dir_release,
323 .lock = v9fs_file_lock,
324 .mmap = generic_file_readonly_mmap,
325 .fsync = v9fs_file_fsync,
328 const struct file_operations v9fs_file_operations_dotl = {
329 .llseek = generic_file_llseek,
330 .read = v9fs_file_read,
331 .write = v9fs_file_write,
332 .open = v9fs_file_open,
333 .release = v9fs_dir_release,
334 .lock = v9fs_file_lock,
335 .mmap = generic_file_readonly_mmap,
336 .fsync = v9fs_file_fsync,