4 * Copyright (C) 1995, 1996, 1997 by Paal-Kr. Engstad and Volker Lendecke
5 * Copyright (C) 1997 by Volker Lendecke
7 * Please add a note about your changes to smbfs in the ChangeLog file.
10 #include <linux/time.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/fcntl.h>
14 #include <linux/stat.h>
16 #include <linux/slab.h>
17 #include <linux/pagemap.h>
18 #include <linux/smp_lock.h>
19 #include <linux/net.h>
21 #include <asm/uaccess.h>
22 #include <asm/system.h>
24 #include <linux/smbno.h>
25 #include <linux/smb_fs.h>
27 #include "smb_debug.h"
31 smb_fsync(struct file *file, struct dentry * dentry, int datasync)
33 struct smb_sb_info *server = server_from_dentry(dentry);
36 VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry));
39 * The VFS will writepage() all dirty pages for us, but we
40 * should send a SMBflush to the server, letting it know that
41 * we want things synchronized with actual storage.
43 * Note: this function requires all pages to have been written already
44 * (should be ok with writepage_sync)
46 result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid);
51 * Read a page synchronously.
54 smb_readpage_sync(struct dentry *dentry, struct page *page)
56 char *buffer = kmap(page);
57 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
58 struct smb_sb_info *server = server_from_dentry(dentry);
59 unsigned int rsize = smb_get_rsize(server);
60 int count = PAGE_SIZE;
63 VERBOSE("file %s/%s, count=%d@%Ld, rsize=%d\n",
64 DENTRY_PATH(dentry), count, offset, rsize);
66 result = smb_open(dentry, SMB_O_RDONLY);
74 result = server->ops->read(dentry->d_inode,offset,rsize,buffer);
81 dentry->d_inode->i_atime =
82 current_fs_time(dentry->d_inode->i_sb);
87 memset(buffer, 0, count);
88 flush_dcache_page(page);
89 SetPageUptodate(page);
99 * We are called with the page locked and we unlock it when done.
102 smb_readpage(struct file *file, struct page *page)
105 struct dentry *dentry = file->f_dentry;
107 page_cache_get(page);
108 error = smb_readpage_sync(dentry, page);
109 page_cache_release(page);
114 * Write a page synchronously.
115 * Offset is the data offset within the page.
118 smb_writepage_sync(struct inode *inode, struct page *page,
119 unsigned long pageoffset, unsigned int count)
122 char *buffer = kmap(page) + pageoffset;
123 struct smb_sb_info *server = server_from_inode(inode);
124 unsigned int wsize = smb_get_wsize(server);
127 offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset;
128 VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n",
129 inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize);
137 write_ret = server->ops->write(inode, offset, wsize, buffer);
139 PARANOIA("failed write, wsize=%d, write_ret=%d\n",
144 /* N.B. what if result < wsize?? */
145 #ifdef SMBFS_PARANOIA
146 if (write_ret < wsize)
147 PARANOIA("short write, wsize=%d, write_ret=%d\n",
154 * Update the inode now rather than waiting for a refresh.
156 inode->i_mtime = inode->i_atime = current_fs_time(inode->i_sb);
157 SMB_I(inode)->flags |= SMB_F_LOCALWRITE;
158 if (offset > inode->i_size)
159 inode->i_size = offset;
167 * Write a page to the server. This will be used for NFS swapping only
168 * (for now), and we currently do this synchronously only.
170 * We are called with the page locked and we unlock it when done.
173 smb_writepage(struct page *page, struct writeback_control *wbc)
175 struct address_space *mapping = page->mapping;
177 unsigned long end_index;
178 unsigned offset = PAGE_CACHE_SIZE;
183 inode = mapping->host;
187 end_index = inode->i_size >> PAGE_CACHE_SHIFT;
190 if (page->index < end_index)
192 /* things got complicated... */
193 offset = inode->i_size & (PAGE_CACHE_SIZE-1);
194 /* OK, are we completely out? */
195 if (page->index >= end_index+1 || !offset)
196 return 0; /* truncated - don't care */
198 page_cache_get(page);
199 err = smb_writepage_sync(inode, page, 0, offset);
200 SetPageUptodate(page);
202 page_cache_release(page);
207 smb_updatepage(struct file *file, struct page *page, unsigned long offset,
210 struct dentry *dentry = file->f_dentry;
212 DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count,
213 ((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset);
215 return smb_writepage_sync(dentry->d_inode, page, offset, count);
219 smb_file_read(struct file * file, char __user * buf, size_t count, loff_t *ppos)
221 struct dentry * dentry = file->f_dentry;
224 VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
225 (unsigned long) count, (unsigned long) *ppos);
227 status = smb_revalidate_inode(dentry);
229 PARANOIA("%s/%s validation failed, error=%Zd\n",
230 DENTRY_PATH(dentry), status);
234 VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n",
235 (long)dentry->d_inode->i_size,
236 dentry->d_inode->i_flags, dentry->d_inode->i_atime);
238 status = generic_file_read(file, buf, count, ppos);
244 smb_file_mmap(struct file * file, struct vm_area_struct * vma)
246 struct dentry * dentry = file->f_dentry;
249 VERBOSE("file %s/%s, address %lu - %lu\n",
250 DENTRY_PATH(dentry), vma->vm_start, vma->vm_end);
252 status = smb_revalidate_inode(dentry);
254 PARANOIA("%s/%s validation failed, error=%d\n",
255 DENTRY_PATH(dentry), status);
258 status = generic_file_mmap(file, vma);
264 smb_file_sendfile(struct file *file, loff_t *ppos,
265 size_t count, read_actor_t actor, void *target)
267 struct dentry *dentry = file->f_dentry;
270 VERBOSE("file %s/%s, pos=%Ld, count=%d\n",
271 DENTRY_PATH(dentry), *ppos, count);
273 status = smb_revalidate_inode(dentry);
275 PARANOIA("%s/%s validation failed, error=%Zd\n",
276 DENTRY_PATH(dentry), status);
279 status = generic_file_sendfile(file, ppos, count, actor, target);
285 * This does the "real" work of the write. The generic routine has
286 * allocated the page, locked it, done all the page alignment stuff
287 * calculations etc. Now we should just copy the data from user
288 * space and write it back to the real medium..
290 * If the writer ends up delaying the write, the writer needs to
291 * increment the page use counts until he is done with the page.
293 static int smb_prepare_write(struct file *file, struct page *page,
294 unsigned offset, unsigned to)
299 static int smb_commit_write(struct file *file, struct page *page,
300 unsigned offset, unsigned to)
306 status = smb_updatepage(file, page, offset, to-offset);
311 struct address_space_operations smb_file_aops = {
312 .readpage = smb_readpage,
313 .writepage = smb_writepage,
314 .prepare_write = smb_prepare_write,
315 .commit_write = smb_commit_write
319 * Write to a file (through the page cache).
322 smb_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
324 struct dentry * dentry = file->f_dentry;
327 VERBOSE("file %s/%s, count=%lu@%lu\n",
329 (unsigned long) count, (unsigned long) *ppos);
331 result = smb_revalidate_inode(dentry);
333 PARANOIA("%s/%s validation failed, error=%Zd\n",
334 DENTRY_PATH(dentry), result);
338 result = smb_open(dentry, SMB_O_WRONLY);
343 result = generic_file_write(file, buf, count, ppos);
344 VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
345 (long) file->f_pos, (long) dentry->d_inode->i_size,
346 dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
353 smb_file_open(struct inode *inode, struct file * file)
356 struct dentry *dentry = file->f_dentry;
357 int smb_mode = (file->f_mode & O_ACCMODE) - 1;
360 result = smb_open(dentry, smb_mode);
363 SMB_I(inode)->openers++;
370 smb_file_release(struct inode *inode, struct file * file)
373 if (!--SMB_I(inode)->openers) {
374 /* We must flush any dirty pages now as we won't be able to
375 write anything after close. mmap can trigger this.
376 "openers" should perhaps include mmap'ers ... */
377 filemap_write_and_wait(inode->i_mapping);
385 * Check whether the required access is compatible with
386 * an inode's permission. SMB doesn't recognize superuser
387 * privileges, so we need our own check for this.
390 smb_file_permission(struct inode *inode, int mask, struct nameidata *nd)
392 int mode = inode->i_mode;
395 VERBOSE("mode=%x, mask=%x\n", mode, mask);
397 /* Look at user permissions */
399 if ((mode & 7 & mask) != mask)
404 const struct file_operations smb_file_operations =
406 .llseek = remote_llseek,
407 .read = smb_file_read,
408 .write = smb_file_write,
410 .mmap = smb_file_mmap,
411 .open = smb_file_open,
412 .release = smb_file_release,
414 .sendfile = smb_file_sendfile,
417 struct inode_operations smb_file_inode_operations =
419 .permission = smb_file_permission,
420 .getattr = smb_getattr,
421 .setattr = smb_notify_change,