2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
5 This program can be distributed under the terms of the GNU GPL.
11 #include <linux/pagemap.h>
12 #include <linux/slab.h>
13 #include <linux/kernel.h>
15 static int fuse_open(struct inode *inode, struct file *file)
17 struct fuse_conn *fc = get_fuse_conn(inode);
19 struct fuse_open_in inarg;
20 struct fuse_open_out outarg;
23 /* Restarting the syscall is not allowed if O_CREAT and O_EXCL
24 are both set, because creation will fail on the restart */
25 int excl = (file->f_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL);
27 err = generic_file_open(inode, file);
31 /* If opening the root node, no lookup has been performed on
32 it, so the attributes must be refreshed */
33 if (get_node_id(inode) == FUSE_ROOT_ID) {
34 int err = fuse_do_getattr(inode);
40 req = fuse_get_request_nonint(fc);
42 req = fuse_get_request(fc);
44 return excl ? -EINTR : -ERESTARTSYS;
47 ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
51 ff->release_req = fuse_request_alloc();
52 if (!ff->release_req) {
57 memset(&inarg, 0, sizeof(inarg));
58 inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
59 req->in.h.opcode = FUSE_OPEN;
60 req->in.h.nodeid = get_node_id(inode);
63 req->in.args[0].size = sizeof(inarg);
64 req->in.args[0].value = &inarg;
66 req->out.args[0].size = sizeof(outarg);
67 req->out.args[0].value = &outarg;
69 request_send_nonint(fc, req);
71 request_send(fc, req);
72 err = req->out.h.error;
73 if (!err && !(fc->flags & FUSE_KERNEL_CACHE))
74 invalidate_inode_pages(inode->i_mapping);
76 fuse_request_free(ff->release_req);
80 file->private_data = ff;
84 fuse_put_request(fc, req);
88 static int fuse_release(struct inode *inode, struct file *file)
90 struct fuse_conn *fc = get_fuse_conn(inode);
91 struct fuse_file *ff = file->private_data;
92 struct fuse_req *req = ff->release_req;
93 struct fuse_release_in *inarg = &req->misc.release_in;
96 inarg->flags = file->f_flags & ~O_EXCL;
97 req->in.h.opcode = FUSE_RELEASE;
98 req->in.h.nodeid = get_node_id(inode);
101 req->in.args[0].size = sizeof(struct fuse_release_in);
102 req->in.args[0].value = inarg;
103 request_send_background(fc, req);
106 /* Return value is ignored by VFS */
110 static int fuse_flush(struct file *file)
112 struct inode *inode = file->f_dentry->d_inode;
113 struct fuse_conn *fc = get_fuse_conn(inode);
114 struct fuse_file *ff = file->private_data;
115 struct fuse_req *req;
116 struct fuse_flush_in inarg;
122 req = fuse_get_request_nonint(fc);
126 memset(&inarg, 0, sizeof(inarg));
128 req->in.h.opcode = FUSE_FLUSH;
129 req->in.h.nodeid = get_node_id(inode);
133 req->in.args[0].size = sizeof(inarg);
134 req->in.args[0].value = &inarg;
135 request_send_nonint(fc, req);
136 err = req->out.h.error;
137 fuse_put_request(fc, req);
138 if (err == -ENOSYS) {
145 static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
147 struct inode *inode = de->d_inode;
148 struct fuse_conn *fc = get_fuse_conn(inode);
149 struct fuse_file *ff = file->private_data;
150 struct fuse_req *req;
151 struct fuse_fsync_in inarg;
157 req = fuse_get_request(fc);
161 memset(&inarg, 0, sizeof(inarg));
163 inarg.fsync_flags = datasync ? 1 : 0;
164 req->in.h.opcode = FUSE_FSYNC;
165 req->in.h.nodeid = get_node_id(inode);
169 req->in.args[0].size = sizeof(inarg);
170 req->in.args[0].value = &inarg;
171 request_send(fc, req);
172 err = req->out.h.error;
173 fuse_put_request(fc, req);
174 if (err == -ENOSYS) {
181 static ssize_t fuse_send_read(struct fuse_req *req, struct file *file,
182 struct inode *inode, loff_t pos, size_t count)
184 struct fuse_conn *fc = get_fuse_conn(inode);
185 struct fuse_file *ff = file->private_data;
186 struct fuse_read_in inarg;
188 memset(&inarg, 0, sizeof(struct fuse_read_in));
192 req->in.h.opcode = FUSE_READ;
193 req->in.h.nodeid = get_node_id(inode);
197 req->in.args[0].size = sizeof(struct fuse_read_in);
198 req->in.args[0].value = &inarg;
199 req->out.argpages = 1;
201 req->out.numargs = 1;
202 req->out.args[0].size = count;
203 request_send_nonint(fc, req);
204 return req->out.args[0].size;
207 static int fuse_readpage(struct file *file, struct page *page)
209 struct inode *inode = page->mapping->host;
210 struct fuse_conn *fc = get_fuse_conn(inode);
211 loff_t pos = (loff_t) page->index << PAGE_CACHE_SHIFT;
212 struct fuse_req *req = fuse_get_request_nonint(fc);
217 req->out.page_zeroing = 1;
219 req->pages[0] = page;
220 fuse_send_read(req, file, inode, pos, PAGE_CACHE_SIZE);
221 err = req->out.h.error;
222 fuse_put_request(fc, req);
224 SetPageUptodate(page);
230 static ssize_t fuse_send_write(struct fuse_req *req, struct file *file,
231 struct inode *inode, loff_t pos, size_t count)
233 struct fuse_conn *fc = get_fuse_conn(inode);
234 struct fuse_file *ff = file->private_data;
235 struct fuse_write_in inarg;
236 struct fuse_write_out outarg;
238 memset(&inarg, 0, sizeof(struct fuse_write_in));
242 req->in.h.opcode = FUSE_WRITE;
243 req->in.h.nodeid = get_node_id(inode);
246 req->in.argpages = 1;
248 req->in.args[0].size = sizeof(struct fuse_write_in);
249 req->in.args[0].value = &inarg;
250 req->in.args[1].size = count;
251 req->out.numargs = 1;
252 req->out.args[0].size = sizeof(struct fuse_write_out);
253 req->out.args[0].value = &outarg;
254 request_send_nonint(fc, req);
258 static int fuse_prepare_write(struct file *file, struct page *page,
259 unsigned offset, unsigned to)
265 static int fuse_commit_write(struct file *file, struct page *page,
266 unsigned offset, unsigned to)
270 unsigned count = to - offset;
271 struct inode *inode = page->mapping->host;
272 struct fuse_conn *fc = get_fuse_conn(inode);
273 loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + offset;
274 struct fuse_req *req = fuse_get_request_nonint(fc);
279 req->pages[0] = page;
280 req->page_offset = offset;
281 nres = fuse_send_write(req, file, inode, pos, count);
282 err = req->out.h.error;
283 fuse_put_request(fc, req);
284 if (!err && nres != count)
288 if (pos > i_size_read(inode))
289 i_size_write(inode, pos);
291 if (offset == 0 && to == PAGE_CACHE_SIZE) {
292 clear_page_dirty(page);
293 SetPageUptodate(page);
295 } else if (err == -EINTR || err == -EIO)
296 fuse_invalidate_attr(inode);
300 static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
302 if ((vma->vm_flags & VM_SHARED)) {
303 if ((vma->vm_flags & VM_WRITE))
306 vma->vm_flags &= ~VM_MAYWRITE;
308 return generic_file_mmap(file, vma);
311 static int fuse_set_page_dirty(struct page *page)
313 printk("fuse_set_page_dirty: should not happen\n");
318 static struct file_operations fuse_file_operations = {
319 .llseek = generic_file_llseek,
320 .read = generic_file_read,
321 .write = generic_file_write,
322 .mmap = fuse_file_mmap,
325 .release = fuse_release,
327 .sendfile = generic_file_sendfile,
330 static struct address_space_operations fuse_file_aops = {
331 .readpage = fuse_readpage,
332 .prepare_write = fuse_prepare_write,
333 .commit_write = fuse_commit_write,
334 .set_page_dirty = fuse_set_page_dirty,
337 void fuse_init_file_inode(struct inode *inode)
339 inode->i_fop = &fuse_file_operations;
340 inode->i_data.a_ops = &fuse_file_aops;