4 * Copyright (C) 1995, 1996 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/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/smp_lock.h>
14 #include <linux/ctype.h>
15 #include <linux/net.h>
16 #include <linux/sched.h>
17 #include <linux/namei.h>
20 #include "smb_mount.h"
23 #include "smb_debug.h"
26 static int smb_readdir(struct file *, void *, filldir_t);
27 static int smb_dir_open(struct inode *, struct file *);
29 static struct dentry *smb_lookup(struct inode *, struct dentry *, struct nameidata *);
30 static int smb_create(struct inode *, struct dentry *, int, struct nameidata *);
31 static int smb_mkdir(struct inode *, struct dentry *, int);
32 static int smb_rmdir(struct inode *, struct dentry *);
33 static int smb_unlink(struct inode *, struct dentry *);
34 static int smb_rename(struct inode *, struct dentry *,
35 struct inode *, struct dentry *);
36 static int smb_make_node(struct inode *,struct dentry *,int,dev_t);
37 static int smb_link(struct dentry *, struct inode *, struct dentry *);
39 const struct file_operations smb_dir_operations =
41 .llseek = generic_file_llseek,
42 .read = generic_read_dir,
43 .readdir = smb_readdir,
44 .unlocked_ioctl = smb_ioctl,
48 const struct inode_operations smb_dir_inode_operations =
56 .getattr = smb_getattr,
57 .setattr = smb_notify_change,
60 const struct inode_operations smb_dir_inode_operations_unix =
68 .getattr = smb_getattr,
69 .setattr = smb_notify_change,
70 .symlink = smb_symlink,
71 .mknod = smb_make_node,
76 * Read a directory, using filldir to fill the dirent memory.
77 * smb_proc_readdir does the actual reading from the smb server.
79 * The cache code is almost directly taken from ncpfs
82 smb_readdir(struct file *filp, void *dirent, filldir_t filldir)
84 struct dentry *dentry = filp->f_path.dentry;
85 struct inode *dir = dentry->d_inode;
86 struct smb_sb_info *server = server_from_dentry(dentry);
87 union smb_dir_cache *cache = NULL;
88 struct smb_cache_control ctl;
89 struct page *page = NULL;
95 VERBOSE("reading %s/%s, f_pos=%d\n",
96 DENTRY_PATH(dentry), (int) filp->f_pos);
102 switch ((unsigned int) filp->f_pos) {
104 if (filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR) < 0)
109 if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR) < 0)
115 * Make sure our inode is up-to-date.
117 result = smb_revalidate_inode(dentry);
122 page = grab_cache_page(&dir->i_data, 0);
126 ctl.cache = cache = kmap(page);
127 ctl.head = cache->head;
129 if (!PageUptodate(page) || !ctl.head.eof) {
130 VERBOSE("%s/%s, page uptodate=%d, eof=%d\n",
131 DENTRY_PATH(dentry), PageUptodate(page),ctl.head.eof);
135 if (filp->f_pos == 2) {
136 if (jiffies - ctl.head.time >= SMB_MAX_AGE(server))
140 * N.B. ncpfs checks mtime of dentry too here, we don't.
141 * 1. common smb servers do not update mtime on dir changes
142 * 2. it requires an extra smb request
143 * (revalidate has the same timeout as ctl.head.time)
145 * Instead smbfs invalidates its own cache on local changes
146 * and remote changes are not seen until timeout.
150 if (filp->f_pos > ctl.head.end)
153 ctl.fpos = filp->f_pos + (SMB_DIRCACHE_START - 2);
154 ctl.ofs = ctl.fpos / SMB_DIRCACHE_SIZE;
155 ctl.idx = ctl.fpos % SMB_DIRCACHE_SIZE;
159 ctl.page = find_lock_page(&dir->i_data, ctl.ofs);
162 ctl.cache = kmap(ctl.page);
163 if (!PageUptodate(ctl.page))
166 while (ctl.idx < SMB_DIRCACHE_SIZE) {
170 dent = smb_dget_fpos(ctl.cache->dentry[ctl.idx],
171 dentry, filp->f_pos);
175 res = filldir(dirent, dent->d_name.name,
176 dent->d_name.len, filp->f_pos,
177 dent->d_inode->i_ino, DT_UNKNOWN);
183 if (filp->f_pos > ctl.head.end)
188 SetPageUptodate(ctl.page);
189 unlock_page(ctl.page);
190 page_cache_release(ctl.page);
199 unlock_page(ctl.page);
200 page_cache_release(ctl.page);
205 smb_invalidate_dircache_entries(dentry);
206 ctl.head.time = jiffies;
210 ctl.idx = SMB_DIRCACHE_START;
214 result = server->ops->readdir(filp, dirent, filldir, &ctl);
215 if (result == -ERESTARTSYS && page)
216 ClearPageUptodate(page);
218 goto invalid_cache; /* retry */
219 ctl.head.end = ctl.fpos - 1;
220 ctl.head.eof = ctl.valid;
223 cache->head = ctl.head;
225 if (result != -ERESTARTSYS)
226 SetPageUptodate(page);
228 page_cache_release(page);
232 SetPageUptodate(ctl.page);
233 unlock_page(ctl.page);
234 page_cache_release(ctl.page);
242 smb_dir_open(struct inode *dir, struct file *file)
244 struct dentry *dentry = file->f_path.dentry;
245 struct smb_sb_info *server;
248 VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name,
249 file->f_path.dentry->d_name.name);
252 * Directory timestamps in the core protocol aren't updated
253 * when a file is added, so we give them a very short TTL.
256 server = server_from_dentry(dentry);
257 if (server->opt.protocol < SMB_PROTOCOL_LANMAN2) {
258 unsigned long age = jiffies - SMB_I(dir)->oldmtime;
260 smb_invalid_dir_cache(dir);
264 * Note: in order to allow the smbmount process to open the
265 * mount point, we only revalidate if the connection is valid or
266 * if the process is trying to access something other than the root.
268 if (server->state == CONN_VALID || !IS_ROOT(dentry))
269 error = smb_revalidate_inode(dentry);
275 * Dentry operations routines
277 static int smb_lookup_validate(struct dentry *, struct nameidata *);
278 static int smb_hash_dentry(const struct dentry *, const struct inode *,
280 static int smb_compare_dentry(const struct dentry *,
281 const struct inode *,
282 const struct dentry *, const struct inode *,
283 unsigned int, const char *, const struct qstr *);
284 static int smb_delete_dentry(const struct dentry *);
286 const struct dentry_operations smbfs_dentry_operations =
288 .d_revalidate = smb_lookup_validate,
289 .d_hash = smb_hash_dentry,
290 .d_compare = smb_compare_dentry,
291 .d_delete = smb_delete_dentry,
294 const struct dentry_operations smbfs_dentry_operations_case =
296 .d_revalidate = smb_lookup_validate,
297 .d_delete = smb_delete_dentry,
302 * This is the callback when the dcache has a lookup hit.
305 smb_lookup_validate(struct dentry *dentry, struct nameidata *nd)
307 struct smb_sb_info *server;
312 if (nd->flags & LOOKUP_RCU)
315 server = server_from_dentry(dentry);
316 inode = dentry->d_inode;
317 age = jiffies - dentry->d_time;
320 * The default validation is based on dentry age:
321 * we believe in dentries for a few seconds. (But each
322 * successful server lookup renews the timestamp.)
324 valid = (age <= SMB_MAX_AGE(server));
325 #ifdef SMBFS_DEBUG_VERBOSE
327 VERBOSE("%s/%s not valid, age=%lu\n",
328 DENTRY_PATH(dentry), age);
333 if (is_bad_inode(inode)) {
334 PARANOIA("%s/%s has dud inode\n", DENTRY_PATH(dentry));
337 valid = (smb_revalidate_inode(dentry) == 0);
341 * What should we do for negative dentries?
348 smb_hash_dentry(const struct dentry *dir, const struct inode *inode,
354 hash = init_name_hash();
355 for (i=0; i < this->len ; i++)
356 hash = partial_name_hash(tolower(this->name[i]), hash);
357 this->hash = end_name_hash(hash);
363 smb_compare_dentry(const struct dentry *parent,
364 const struct inode *pinode,
365 const struct dentry *dentry, const struct inode *inode,
366 unsigned int len, const char *str, const struct qstr *name)
370 if (len != name->len)
372 for (i=0; i < len; i++) {
373 if (tolower(str[i]) != tolower(name->name[i]))
382 * This is the callback from dput() when d_count is going to 0.
383 * We use this to unhash dentries with bad inodes.
386 smb_delete_dentry(const struct dentry *dentry)
388 if (dentry->d_inode) {
389 if (is_bad_inode(dentry->d_inode)) {
390 PARANOIA("bad inode, unhashing %s/%s\n",
391 DENTRY_PATH(dentry));
395 /* N.B. Unhash negative dentries? */
401 * Initialize a new dentry
404 smb_new_dentry(struct dentry *dentry)
406 dentry->d_time = jiffies;
411 * Whenever a lookup succeeds, we know the parent directories
412 * are all valid, so we want to update the dentry timestamps.
413 * N.B. Move this to dcache?
416 smb_renew_times(struct dentry * dentry)
419 dentry->d_time = jiffies;
421 while (!IS_ROOT(dentry)) {
422 struct dentry *parent = dget_parent(dentry);
426 dentry->d_time = jiffies;
431 static struct dentry *
432 smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
434 struct smb_fattr finfo;
438 error = -ENAMETOOLONG;
439 if (dentry->d_name.len > SMB_MAXNAMELEN)
442 /* Do not allow lookup of names with backslashes in */
444 if (memchr(dentry->d_name.name, '\\', dentry->d_name.len))
448 error = smb_proc_getattr(dentry, &finfo);
449 #ifdef SMBFS_PARANOIA
450 if (error && error != -ENOENT)
451 PARANOIA("find %s/%s failed, error=%d\n",
452 DENTRY_PATH(dentry), error);
456 if (error == -ENOENT)
460 finfo.f_ino = iunique(dentry->d_sb, 2);
461 inode = smb_iget(dir->i_sb, &finfo);
464 d_add(dentry, inode);
465 smb_renew_times(dentry);
471 return ERR_PTR(error);
475 * This code is common to all routines creating a new inode.
478 smb_instantiate(struct dentry *dentry, __u16 fileid, int have_id)
480 struct smb_sb_info *server = server_from_dentry(dentry);
483 struct smb_fattr fattr;
485 VERBOSE("file %s/%s, fileid=%u\n", DENTRY_PATH(dentry), fileid);
487 error = smb_proc_getattr(dentry, &fattr);
491 smb_renew_times(dentry);
492 fattr.f_ino = iunique(dentry->d_sb, 2);
493 inode = smb_iget(dentry->d_sb, &fattr);
498 struct smb_inode_info *ei = SMB_I(inode);
500 ei->access = SMB_O_RDWR;
501 ei->open = server->generation;
503 d_instantiate(dentry, inode);
511 PARANOIA("%s/%s failed, error=%d, closing %u\n",
512 DENTRY_PATH(dentry), error, fileid);
513 smb_close_fileid(dentry, fileid);
518 /* N.B. How should the mode argument be used? */
520 smb_create(struct inode *dir, struct dentry *dentry, int mode,
521 struct nameidata *nd)
523 struct smb_sb_info *server = server_from_dentry(dentry);
528 VERBOSE("creating %s/%s, mode=%d\n", DENTRY_PATH(dentry), mode);
531 smb_invalid_dir_cache(dir);
532 error = smb_proc_create(dentry, 0, get_seconds(), &fileid);
534 if (server->opt.capabilities & SMB_CAP_UNIX) {
535 /* Set attributes for new file */
536 attr.ia_valid = ATTR_MODE;
538 error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
540 error = smb_instantiate(dentry, fileid, 1);
542 PARANOIA("%s/%s failed, error=%d\n",
543 DENTRY_PATH(dentry), error);
549 /* N.B. How should the mode argument be used? */
551 smb_mkdir(struct inode *dir, struct dentry *dentry, int mode)
553 struct smb_sb_info *server = server_from_dentry(dentry);
558 smb_invalid_dir_cache(dir);
559 error = smb_proc_mkdir(dentry);
561 if (server->opt.capabilities & SMB_CAP_UNIX) {
562 /* Set attributes for new directory */
563 attr.ia_valid = ATTR_MODE;
565 error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
567 error = smb_instantiate(dentry, 0, 0);
574 smb_rmdir(struct inode *dir, struct dentry *dentry)
576 struct inode *inode = dentry->d_inode;
580 * Close the directory if it's open.
586 * Check that nobody else is using the directory..
589 if (!d_unhashed(dentry))
592 smb_invalid_dir_cache(dir);
593 error = smb_proc_rmdir(dentry);
601 smb_unlink(struct inode *dir, struct dentry *dentry)
606 * Close the file if it's open.
609 smb_close(dentry->d_inode);
611 smb_invalid_dir_cache(dir);
612 error = smb_proc_unlink(dentry);
614 smb_renew_times(dentry);
620 smb_rename(struct inode *old_dir, struct dentry *old_dentry,
621 struct inode *new_dir, struct dentry *new_dentry)
626 * Close any open files, and check whether to delete the
627 * target before attempting the rename.
630 if (old_dentry->d_inode)
631 smb_close(old_dentry->d_inode);
632 if (new_dentry->d_inode) {
633 smb_close(new_dentry->d_inode);
634 error = smb_proc_unlink(new_dentry);
636 VERBOSE("unlink %s/%s, error=%d\n",
637 DENTRY_PATH(new_dentry), error);
641 d_delete(new_dentry);
644 smb_invalid_dir_cache(old_dir);
645 smb_invalid_dir_cache(new_dir);
646 error = smb_proc_mv(old_dentry, new_dentry);
648 smb_renew_times(old_dentry);
649 smb_renew_times(new_dentry);
657 * FIXME: samba servers won't let you create device nodes unless uid/gid
658 * matches the connection credentials (and we don't know which those are ...)
661 smb_make_node(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
666 attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
668 current_euid_egid(&attr.ia_uid, &attr.ia_gid);
670 if (!new_valid_dev(dev))
673 smb_invalid_dir_cache(dir);
674 error = smb_proc_setattr_unix(dentry, &attr, MAJOR(dev), MINOR(dev));
676 error = smb_instantiate(dentry, 0, 0);
682 * dentry = existing file
683 * new_dentry = new file
686 smb_link(struct dentry *dentry, struct inode *dir, struct dentry *new_dentry)
690 DEBUG1("smb_link old=%s/%s new=%s/%s\n",
691 DENTRY_PATH(dentry), DENTRY_PATH(new_dentry));
692 smb_invalid_dir_cache(dir);
693 error = smb_proc_link(server_from_dentry(dentry), dentry, new_dentry);
695 smb_renew_times(dentry);
696 error = smb_instantiate(new_dentry, 0, 0);