1 files changed, 696 insertions, 0 deletions

diff --git a/drivers/staging/smbfs/dir.c b/drivers/staging/smbfs/dir.c
new file mode 100644
index 0000000..f088ea2
--- /dev/null
+++ b/drivers/staging/smbfs/dir.c
@@ -0,0 +1,696 @@
+/*
+ *  dir.c
+ *
+ *  Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
+ *  Copyright (C) 1997 by Volker Lendecke
+ *
+ *  Please add a note about your changes to smbfs in the ChangeLog file.
+ */
+
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/ctype.h>
+#include <linux/net.h>
+#include <linux/sched.h>
+
+#include "smb_fs.h"
+#include "smb_mount.h"
+#include "smbno.h"
+
+#include "smb_debug.h"
+#include "proto.h"
+
+static int smb_readdir(struct file *, void *, filldir_t);
+static int smb_dir_open(struct inode *, struct file *);
+
+static struct dentry *smb_lookup(struct inode *, struct dentry *, struct nameidata *);
+static int smb_create(struct inode *, struct dentry *, int, struct nameidata *);
+static int smb_mkdir(struct inode *, struct dentry *, int);
+static int smb_rmdir(struct inode *, struct dentry *);
+static int smb_unlink(struct inode *, struct dentry *);
+static int smb_rename(struct inode *, struct dentry *,
+		      struct inode *, struct dentry *);
+static int smb_make_node(struct inode *,struct dentry *,int,dev_t);
+static int smb_link(struct dentry *, struct inode *, struct dentry *);
+
+const struct file_operations smb_dir_operations =
+{
+	.llseek		= generic_file_llseek,
+	.read		= generic_read_dir,
+	.readdir	= smb_readdir,
+	.unlocked_ioctl	= smb_ioctl,
+	.open		= smb_dir_open,
+};
+
+const struct inode_operations smb_dir_inode_operations =
+{
+	.create		= smb_create,
+	.lookup		= smb_lookup,
+	.unlink		= smb_unlink,
+	.mkdir		= smb_mkdir,
+	.rmdir		= smb_rmdir,
+	.rename		= smb_rename,
+	.getattr	= smb_getattr,
+	.setattr	= smb_notify_change,
+};
+
+const struct inode_operations smb_dir_inode_operations_unix =
+{
+	.create		= smb_create,
+	.lookup		= smb_lookup,
+	.unlink		= smb_unlink,
+	.mkdir		= smb_mkdir,
+	.rmdir		= smb_rmdir,
+	.rename		= smb_rename,
+	.getattr	= smb_getattr,
+	.setattr	= smb_notify_change,
+	.symlink	= smb_symlink,
+	.mknod		= smb_make_node,
+	.link		= smb_link,
+};
+
+/*
+ * Read a directory, using filldir to fill the dirent memory.
+ * smb_proc_readdir does the actual reading from the smb server.
+ *
+ * The cache code is almost directly taken from ncpfs
+ */
+static int 
+smb_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+	struct dentry *dentry = filp->f_path.dentry;
+	struct inode *dir = dentry->d_inode;
+	struct smb_sb_info *server = server_from_dentry(dentry);
+	union  smb_dir_cache *cache = NULL;
+	struct smb_cache_control ctl;
+	struct page *page = NULL;
+	int result;
+
+	ctl.page  = NULL;
+	ctl.cache = NULL;
+
+	VERBOSE("reading %s/%s, f_pos=%d\n",
+		DENTRY_PATH(dentry),  (int) filp->f_pos);
+
+	result = 0;
+
+	lock_kernel();
+
+	switch ((unsigned int) filp->f_pos) {
+	case 0:
+		if (filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR) < 0)
+			goto out;
+		filp->f_pos = 1;
+		/* fallthrough */
+	case 1:
+		if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR) < 0)
+			goto out;
+		filp->f_pos = 2;
+	}
+
+	/*
+	 * Make sure our inode is up-to-date.
+	 */
+	result = smb_revalidate_inode(dentry);
+	if (result)
+		goto out;
+
+
+	page = grab_cache_page(&dir->i_data, 0);
+	if (!page)
+		goto read_really;
+
+	ctl.cache = cache = kmap(page);
+	ctl.head  = cache->head;
+
+	if (!PageUptodate(page) || !ctl.head.eof) {
+		VERBOSE("%s/%s, page uptodate=%d, eof=%d\n",
+			 DENTRY_PATH(dentry), PageUptodate(page),ctl.head.eof);
+		goto init_cache;
+	}
+
+	if (filp->f_pos == 2) {
+		if (jiffies - ctl.head.time >= SMB_MAX_AGE(server))
+			goto init_cache;
+
+		/*
+		 * N.B. ncpfs checks mtime of dentry too here, we don't.
+		 *   1. common smb servers do not update mtime on dir changes
+		 *   2. it requires an extra smb request
+		 *      (revalidate has the same timeout as ctl.head.time)
+		 *
+		 * Instead smbfs invalidates its own cache on local changes
+		 * and remote changes are not seen until timeout.
+		 */
+	}
+
+	if (filp->f_pos > ctl.head.end)
+		goto finished;
+
+	ctl.fpos = filp->f_pos + (SMB_DIRCACHE_START - 2);
+	ctl.ofs  = ctl.fpos / SMB_DIRCACHE_SIZE;
+	ctl.idx  = ctl.fpos % SMB_DIRCACHE_SIZE;
+
+	for (;;) {
+		if (ctl.ofs != 0) {
+			ctl.page = find_lock_page(&dir->i_data, ctl.ofs);
+			if (!ctl.page)
+				goto invalid_cache;
+			ctl.cache = kmap(ctl.page);
+			if (!PageUptodate(ctl.page))
+				goto invalid_cache;
+		}
+		while (ctl.idx < SMB_DIRCACHE_SIZE) {
+			struct dentry *dent;
+			int res;
+
+			dent = smb_dget_fpos(ctl.cache->dentry[ctl.idx],
+					     dentry, filp->f_pos);
+			if (!dent)
+				goto invalid_cache;
+
+			res = filldir(dirent, dent->d_name.name,
+				      dent->d_name.len, filp->f_pos,
+				      dent->d_inode->i_ino, DT_UNKNOWN);
+			dput(dent);
+			if (res)
+				goto finished;
+			filp->f_pos += 1;
+			ctl.idx += 1;
+			if (filp->f_pos > ctl.head.end)
+				goto finished;
+		}
+		if (ctl.page) {
+			kunmap(ctl.page);
+			SetPageUptodate(ctl.page);
+			unlock_page(ctl.page);
+			page_cache_release(ctl.page);
+			ctl.page = NULL;
+		}
+		ctl.idx  = 0;
+		ctl.ofs += 1;
+	}
+invalid_cache:
+	if (ctl.page) {
+		kunmap(ctl.page);
+		unlock_page(ctl.page);
+		page_cache_release(ctl.page);
+		ctl.page = NULL;
+	}
+	ctl.cache = cache;
+init_cache:
+	smb_invalidate_dircache_entries(dentry);
+	ctl.head.time = jiffies;
+	ctl.head.eof = 0;
+	ctl.fpos = 2;
+	ctl.ofs = 0;
+	ctl.idx = SMB_DIRCACHE_START;
+	ctl.filled = 0;
+	ctl.valid  = 1;
+read_really:
+	result = server->ops->readdir(filp, dirent, filldir, &ctl);
+	if (result == -ERESTARTSYS && page)
+		ClearPageUptodate(page);
+	if (ctl.idx == -1)
+		goto invalid_cache;	/* retry */
+	ctl.head.end = ctl.fpos - 1;
+	ctl.head.eof = ctl.valid;
+finished:
+	if (page) {
+		cache->head = ctl.head;
+		kunmap(page);
+		if (result != -ERESTARTSYS)
+			SetPageUptodate(page);
+		unlock_page(page);
+		page_cache_release(page);
+	}
+	if (ctl.page) {
+		kunmap(ctl.page);
+		SetPageUptodate(ctl.page);
+		unlock_page(ctl.page);
+		page_cache_release(ctl.page);
+	}
+out:
+	unlock_kernel();
+	return result;
+}
+
+static int
+smb_dir_open(struct inode *dir, struct file *file)
+{
+	struct dentry *dentry = file->f_path.dentry;
+	struct smb_sb_info *server;
+	int error = 0;
+
+	VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name,
+		file->f_path.dentry->d_name.name);
+
+	/*
+	 * Directory timestamps in the core protocol aren't updated
+	 * when a file is added, so we give them a very short TTL.
+	 */
+	lock_kernel();
+	server = server_from_dentry(dentry);
+	if (server->opt.protocol < SMB_PROTOCOL_LANMAN2) {
+		unsigned long age = jiffies - SMB_I(dir)->oldmtime;
+		if (age > 2*HZ)
+			smb_invalid_dir_cache(dir);
+	}
+
+	/*
+	 * Note: in order to allow the smbmount process to open the
+	 * mount point, we only revalidate if the connection is valid or
+	 * if the process is trying to access something other than the root.
+	 */
+	if (server->state == CONN_VALID || !IS_ROOT(dentry))
+		error = smb_revalidate_inode(dentry);
+	unlock_kernel();
+	return error;
+}
+
+/*
+ * Dentry operations routines
+ */
+static int smb_lookup_validate(struct dentry *, struct nameidata *);
+static int smb_hash_dentry(struct dentry *, struct qstr *);
+static int smb_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
+static int smb_delete_dentry(struct dentry *);
+
+static const struct dentry_operations smbfs_dentry_operations =
+{
+	.d_revalidate	= smb_lookup_validate,
+	.d_hash		= smb_hash_dentry,
+	.d_compare	= smb_compare_dentry,
+	.d_delete	= smb_delete_dentry,
+};
+
+static const struct dentry_operations smbfs_dentry_operations_case =
+{
+	.d_revalidate	= smb_lookup_validate,
+	.d_delete	= smb_delete_dentry,
+};
+
+
+/*
+ * This is the callback when the dcache has a lookup hit.
+ */
+static int
+smb_lookup_validate(struct dentry * dentry, struct nameidata *nd)
+{
+	struct smb_sb_info *server = server_from_dentry(dentry);
+	struct inode * inode = dentry->d_inode;
+	unsigned long age = jiffies - dentry->d_time;
+	int valid;
+
+	/*
+	 * The default validation is based on dentry age:
+	 * we believe in dentries for a few seconds.  (But each
+	 * successful server lookup renews the timestamp.)
+	 */
+	valid = (age <= SMB_MAX_AGE(server));
+#ifdef SMBFS_DEBUG_VERBOSE
+	if (!valid)
+		VERBOSE("%s/%s not valid, age=%lu\n", 
+			DENTRY_PATH(dentry), age);
+#endif
+
+	if (inode) {
+		lock_kernel();
+		if (is_bad_inode(inode)) {
+			PARANOIA("%s/%s has dud inode\n", DENTRY_PATH(dentry));
+			valid = 0;
+		} else if (!valid)
+			valid = (smb_revalidate_inode(dentry) == 0);
+		unlock_kernel();
+	} else {
+		/*
+		 * What should we do for negative dentries?
+		 */
+	}
+	return valid;
+}
+
+static int 
+smb_hash_dentry(struct dentry *dir, struct qstr *this)
+{
+	unsigned long hash;
+	int i;
+
+	hash = init_name_hash();
+	for (i=0; i < this->len ; i++)
+		hash = partial_name_hash(tolower(this->name[i]), hash);
+	this->hash = end_name_hash(hash);
+  
+	return 0;
+}
+
+static int
+smb_compare_dentry(struct dentry *dir, struct qstr *a, struct qstr *b)
+{
+	int i, result = 1;
+
+	if (a->len != b->len)
+		goto out;
+	for (i=0; i < a->len; i++) {
+		if (tolower(a->name[i]) != tolower(b->name[i]))
+			goto out;
+	}
+	result = 0;
+out:
+	return result;
+}
+
+/*
+ * This is the callback from dput() when d_count is going to 0.
+ * We use this to unhash dentries with bad inodes.
+ */
+static int
+smb_delete_dentry(struct dentry * dentry)
+{
+	if (dentry->d_inode) {
+		if (is_bad_inode(dentry->d_inode)) {
+			PARANOIA("bad inode, unhashing %s/%s\n",
+				 DENTRY_PATH(dentry));
+			return 1;
+		}
+	} else {
+		/* N.B. Unhash negative dentries? */
+	}
+	return 0;
+}
+
+/*
+ * Initialize a new dentry
+ */
+void
+smb_new_dentry(struct dentry *dentry)
+{
+	struct smb_sb_info *server = server_from_dentry(dentry);
+
+	if (server->mnt->flags & SMB_MOUNT_CASE)
+		dentry->d_op = &smbfs_dentry_operations_case;
+	else
+		dentry->d_op = &smbfs_dentry_operations;
+	dentry->d_time = jiffies;
+}
+
+
+/*
+ * Whenever a lookup succeeds, we know the parent directories
+ * are all valid, so we want to update the dentry timestamps.
+ * N.B. Move this to dcache?
+ */
+void
+smb_renew_times(struct dentry * dentry)
+{
+	dget(dentry);
+	dentry->d_time = jiffies;
+
+	while (!IS_ROOT(dentry)) {
+		struct dentry *parent = dget_parent(dentry);
+		dput(dentry);
+		dentry = parent;
+
+		dentry->d_time = jiffies;
+	}
+	dput(dentry);
+}
+
+static struct dentry *
+smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+	struct smb_fattr finfo;
+	struct inode *inode;
+	int error;
+	struct smb_sb_info *server;
+
+	error = -ENAMETOOLONG;
+	if (dentry->d_name.len > SMB_MAXNAMELEN)
+		goto out;
+
+	/* Do not allow lookup of names with backslashes in */
+	error = -EINVAL;
+	if (memchr(dentry->d_name.name, '\\', dentry->d_name.len))
+		goto out;
+
+	lock_kernel();
+	error = smb_proc_getattr(dentry, &finfo);
+#ifdef SMBFS_PARANOIA
+	if (error && error != -ENOENT)
+		PARANOIA("find %s/%s failed, error=%d\n",
+			 DENTRY_PATH(dentry), error);
+#endif
+
+	inode = NULL;
+	if (error == -ENOENT)
+		goto add_entry;
+	if (!error) {
+		error = -EACCES;
+		finfo.f_ino = iunique(dentry->d_sb, 2);
+		inode = smb_iget(dir->i_sb, &finfo);
+		if (inode) {
+	add_entry:
+			server = server_from_dentry(dentry);
+			if (server->mnt->flags & SMB_MOUNT_CASE)
+				dentry->d_op = &smbfs_dentry_operations_case;
+			else
+				dentry->d_op = &smbfs_dentry_operations;
+
+			d_add(dentry, inode);
+			smb_renew_times(dentry);
+			error = 0;
+		}
+	}
+	unlock_kernel();
+out:
+	return ERR_PTR(error);
+}
+
+/*
+ * This code is common to all routines creating a new inode.
+ */
+static int
+smb_instantiate(struct dentry *dentry, __u16 fileid, int have_id)
+{
+	struct smb_sb_info *server = server_from_dentry(dentry);
+	struct inode *inode;
+	int error;
+	struct smb_fattr fattr;
+
+	VERBOSE("file %s/%s, fileid=%u\n", DENTRY_PATH(dentry), fileid);
+
+	error = smb_proc_getattr(dentry, &fattr);
+	if (error)
+		goto out_close;
+
+	smb_renew_times(dentry);
+	fattr.f_ino = iunique(dentry->d_sb, 2);
+	inode = smb_iget(dentry->d_sb, &fattr);
+	if (!inode)
+		goto out_no_inode;
+
+	if (have_id) {
+		struct smb_inode_info *ei = SMB_I(inode);
+		ei->fileid = fileid;
+		ei->access = SMB_O_RDWR;
+		ei->open = server->generation;
+	}
+	d_instantiate(dentry, inode);
+out:
+	return error;
+
+out_no_inode:
+	error = -EACCES;
+out_close:
+	if (have_id) {
+		PARANOIA("%s/%s failed, error=%d, closing %u\n",
+			 DENTRY_PATH(dentry), error, fileid);
+		smb_close_fileid(dentry, fileid);
+	}
+	goto out;
+}
+
+/* N.B. How should the mode argument be used? */
+static int
+smb_create(struct inode *dir, struct dentry *dentry, int mode,
+		struct nameidata *nd)
+{
+	struct smb_sb_info *server = server_from_dentry(dentry);
+	__u16 fileid;
+	int error;
+	struct iattr attr;
+
+	VERBOSE("creating %s/%s, mode=%d\n", DENTRY_PATH(dentry), mode);
+
+	lock_kernel();
+	smb_invalid_dir_cache(dir);
+	error = smb_proc_create(dentry, 0, get_seconds(), &fileid);
+	if (!error) {
+		if (server->opt.capabilities & SMB_CAP_UNIX) {
+			/* Set attributes for new file */
+			attr.ia_valid = ATTR_MODE;
+			attr.ia_mode = mode;
+			error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
+		}
+		error = smb_instantiate(dentry, fileid, 1);
+	} else {
+		PARANOIA("%s/%s failed, error=%d\n",
+			 DENTRY_PATH(dentry), error);
+	}
+	unlock_kernel();
+	return error;
+}
+
+/* N.B. How should the mode argument be used? */
+static int
+smb_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	struct smb_sb_info *server = server_from_dentry(dentry);
+	int error;
+	struct iattr attr;
+
+	lock_kernel();
+	smb_invalid_dir_cache(dir);
+	error = smb_proc_mkdir(dentry);
+	if (!error) {
+		if (server->opt.capabilities & SMB_CAP_UNIX) {
+			/* Set attributes for new directory */
+			attr.ia_valid = ATTR_MODE;
+			attr.ia_mode = mode;
+			error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
+		}
+		error = smb_instantiate(dentry, 0, 0);
+	}
+	unlock_kernel();
+	return error;
+}
+
+static int
+smb_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+	int error;
+
+	/*
+	 * Close the directory if it's open.
+	 */
+	lock_kernel();
+	smb_close(inode);
+
+	/*
+	 * Check that nobody else is using the directory..
+	 */
+	error = -EBUSY;
+	if (!d_unhashed(dentry))
+		goto out;
+
+	smb_invalid_dir_cache(dir);
+	error = smb_proc_rmdir(dentry);
+
+out:
+	unlock_kernel();
+	return error;
+}
+
+static int
+smb_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int error;
+
+	/*
+	 * Close the file if it's open.
+	 */
+	lock_kernel();
+	smb_close(dentry->d_inode);
+
+	smb_invalid_dir_cache(dir);
+	error = smb_proc_unlink(dentry);
+	if (!error)
+		smb_renew_times(dentry);
+	unlock_kernel();
+	return error;
+}
+
+static int
+smb_rename(struct inode *old_dir, struct dentry *old_dentry,
+	   struct inode *new_dir, struct dentry *new_dentry)
+{
+	int error;
+
+	/*
+	 * Close any open files, and check whether to delete the
+	 * target before attempting the rename.
+	 */
+	lock_kernel();
+	if (old_dentry->d_inode)
+		smb_close(old_dentry->d_inode);
+	if (new_dentry->d_inode) {
+		smb_close(new_dentry->d_inode);
+		error = smb_proc_unlink(new_dentry);
+		if (error) {
+			VERBOSE("unlink %s/%s, error=%d\n",
+				DENTRY_PATH(new_dentry), error);
+			goto out;
+		}
+		/* FIXME */
+		d_delete(new_dentry);
+	}
+
+	smb_invalid_dir_cache(old_dir);
+	smb_invalid_dir_cache(new_dir);
+	error = smb_proc_mv(old_dentry, new_dentry);
+	if (!error) {
+		smb_renew_times(old_dentry);
+		smb_renew_times(new_dentry);
+	}
+out:
+	unlock_kernel();
+	return error;
+}
+
+/*
+ * FIXME: samba servers won't let you create device nodes unless uid/gid
+ * matches the connection credentials (and we don't know which those are ...)
+ */
+static int
+smb_make_node(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+{
+	int error;
+	struct iattr attr;
+
+	attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
+	attr.ia_mode = mode;
+	current_euid_egid(&attr.ia_uid, &attr.ia_gid);
+
+	if (!new_valid_dev(dev))
+		return -EINVAL;
+
+	smb_invalid_dir_cache(dir);
+	error = smb_proc_setattr_unix(dentry, &attr, MAJOR(dev), MINOR(dev));
+	if (!error) {
+		error = smb_instantiate(dentry, 0, 0);
+	}
+	return error;
+}
+
+/*
+ * dentry = existing file
+ * new_dentry = new file
+ */
+static int
+smb_link(struct dentry *dentry, struct inode *dir, struct dentry *new_dentry)
+{
+	int error;
+
+	DEBUG1("smb_link old=%s/%s new=%s/%s\n",
+	       DENTRY_PATH(dentry), DENTRY_PATH(new_dentry));
+	smb_invalid_dir_cache(dir);
+	error = smb_proc_link(server_from_dentry(dentry), dentry, new_dentry);
+	if (!error) {
+		smb_renew_times(dentry);
+		error = smb_instantiate(new_dentry, 0, 0);
+	}
+	return error;
+}