int
cifs_revalidate(struct dentry *direntry)
{
	int xid;
	int rc = 0;
	char *full_path;
	struct cifs_sb_info *cifs_sb;
	struct cifsInodeInfo *cifsInode;
	loff_t local_size;
	struct timespec local_mtime;
	int invalidate_inode = FALSE;

	if(direntry->d_inode == NULL)
		return -ENOENT;

	cifsInode = CIFS_I(direntry->d_inode);

	if(cifsInode == NULL)
		return -ENOENT;

	/* no sense revalidating inode info on file that no one can write */
	if(CIFS_I(direntry->d_inode)->clientCanCacheRead)
		return rc;

	xid = GetXid();

	cifs_sb = CIFS_SB(direntry->d_sb);

	/* can not safely grab the rename sem here if
	rename calls revalidate since that would deadlock */
	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	cFYI(1,
	     ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld",
	      full_path, direntry->d_inode,
	      direntry->d_inode->i_count.counter, direntry,
	      direntry->d_time, jiffies));

	if (cifsInode->time == 0){
		/* was set to zero previously to force revalidate */
	} else if (time_before(jiffies, cifsInode->time + HZ) && lookupCacheEnabled) {
	    if((S_ISREG(direntry->d_inode->i_mode) == 0) || 
			(direntry->d_inode->i_nlink == 1)) {  
			if (full_path)
				kfree(full_path);
			FreeXid(xid);
			return rc;
		} else {
			cFYI(1,("Have to revalidate file due to hardlinks"));
		}            
	}
	
	/* save mtime and size */
	local_mtime = direntry->d_inode->i_mtime;
	local_size  = direntry->d_inode->i_size;

	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
		rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
					 direntry->d_sb,xid);
		if(rc) {
			cFYI(1,("error on getting revalidate info %d",rc));
/*			if(rc != -ENOENT)
				rc = 0; */ /* BB should we cache info on certain errors? */
		}
	} else {
		rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
				    direntry->d_sb,xid);
		if(rc) {
			cFYI(1,("error on getting revalidate info %d",rc));
/*			if(rc != -ENOENT)
				rc = 0; */  /* BB should we cache info on certain errors? */
		}
	}
	/* should we remap certain errors, access denied?, to zero */

	/* if not oplocked, we invalidate inode pages if mtime 
	   or file size had changed on server */

	if(timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) && 
		(local_size == direntry->d_inode->i_size)) {
		cFYI(1,("cifs_revalidate - inode unchanged"));
	} else {
		/* file may have changed on server */
		if(cifsInode->clientCanCacheRead) {
			/* no need to invalidate inode pages since we were
			   the only ones who could have modified the file and
			   the server copy is staler than ours */
		} else {
			invalidate_inode = TRUE;
		}
	}

	/* can not grab this sem since kernel filesys locking
		documentation indicates i_sem may be taken by the kernel 
		on lookup and rename which could deadlock if we grab
		the i_sem here as well */
/*	down(&direntry->d_inode->i_sem);*/
//.........这里部分代码省略.........

void *
cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
{
	struct inode *inode = direntry->d_inode;
	int rc = -ENOMEM;
	int xid;
	char *full_path = NULL;
	char *target_path = NULL;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct tcon_link *tlink = NULL;
	struct cifs_tcon *tcon;

	xid = GetXid();

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		rc = PTR_ERR(tlink);
		tlink = NULL;
		goto out;
	}
	tcon = tlink_tcon(tlink);

	/*
	 * For now, we just handle symlinks with unix extensions enabled.
	 * Eventually we should handle NTFS reparse points, and MacOS
	 * symlink support. For instance...
	 *
	 * rc = CIFSSMBQueryReparseLinkInfo(...)
	 *
	 * For now, just return -EACCES when the server doesn't support posix
	 * extensions. Note that we still allow querying symlinks when posix
	 * extensions are manually disabled. We could disable these as well
	 * but there doesn't seem to be any harm in allowing the client to
	 * read them.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
	    && !(tcon->ses->capabilities & CAP_UNIX)) {
		rc = -EACCES;
		goto out;
	}

	full_path = build_path_from_dentry(direntry);
	if (!full_path)
		goto out;

	cFYI(1, "Full path: %s inode = 0x%p", full_path, inode);

	rc = -EACCES;
	/*
	 * First try Minshall+French Symlinks, if configured
	 * and fallback to UNIX Extensions Symlinks.
	 */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
		rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);

	if ((rc != 0) && (tcon->ses->capabilities & CAP_UNIX))
		rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
					     cifs_sb->local_nls);

	kfree(full_path);
out:
	if (rc != 0) {
		kfree(target_path);
		target_path = ERR_PTR(rc);
	}

	FreeXid(xid);
	if (tlink)
		cifs_put_tlink(tlink);
	nd_set_link(nd, target_path);
	return NULL;
}

static int cifs_xattr_get(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	/* return alt name if available as pseudo attr */
	switch (handler->flags) {
	case XATTR_USER:
		cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
		if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
			rc = cifs_attrib_get(dentry, inode, value, size);
			break;
		} else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
			rc = cifs_creation_time_get(dentry, inode, value, size);
			break;
		}

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->query_all_EAs)
			rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, name, value, size, cifs_sb);
		break;

	case XATTR_CIFS_ACL: {
#ifdef CONFIG_CIFS_ACL
		u32 acllen;
		struct cifs_ntsd *pacl;

		if (pTcon->ses->server->ops->get_acl == NULL)
			goto out; /* rc already EOPNOTSUPP */

		pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
				inode, full_path, &acllen);
		if (IS_ERR(pacl)) {
			rc = PTR_ERR(pacl);
			cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
				 __func__, rc);
		} else {
			if (value) {
				if (acllen > size)
					acllen = -ERANGE;
				else
					memcpy(value, pacl, acllen);
			}
			rc = acllen;
			kfree(pacl);
		}
#endif  /* CONFIG_CIFS_ACL */
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

	/* We could add an additional check for streams ie
	    if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (rc == -EINVAL)
//.........这里部分代码省略.........

static int
cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
	       struct tcon_link *tlink, unsigned oflags, umode_t mode,
	       __u32 *oplock, struct cifs_fid *fid)
{
	int rc = -ENOENT;
	int create_options = CREATE_NOT_DIR;
	int desired_access;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = tlink_tcon(tlink);
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	int disposition;
	struct TCP_Server_Info *server = tcon->ses->server;
	struct cifs_open_parms oparms;

	*oplock = 0;
	if (tcon->ses->server->oplocks)
		*oplock = REQ_OPLOCK;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
		rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
				     oflags, oplock, &fid->netfid, xid);
		switch (rc) {
		case 0:
			if (newinode == NULL) {
				/* query inode info */
				goto cifs_create_get_file_info;
			}

			if (!S_ISREG(newinode->i_mode)) {
				/*
				 * The server may allow us to open things like
				 * FIFOs, but the client isn't set up to deal
				 * with that. If it's not a regular file, just
				 * close it and proceed as if it were a normal
				 * lookup.
				 */
				CIFSSMBClose(xid, tcon, fid->netfid);
				goto cifs_create_get_file_info;
			}
			/* success, no need to query */
			goto cifs_create_set_dentry;

		case -ENOENT:
			goto cifs_create_get_file_info;

		case -EIO:
		case -EINVAL:
			/*
			 * EIO could indicate that (posix open) operation is not
			 * supported, despite what server claimed in capability
			 * negotiation.
			 *
			 * POSIX open in samba versions 3.3.1 and earlier could
			 * incorrectly fail with invalid parameter.
			 */
			tcon->broken_posix_open = true;
			break;

		case -EREMOTE:
		case -EOPNOTSUPP:
			/*
			 * EREMOTE indicates DFS junction, which is not handled
			 * in posix open.  If either that or op not supported
			 * returned, follow the normal lookup.
			 */
			break;

		default:
			goto out;
		}
		/*
		 * fallthrough to retry, using older open call, this is case
		 * where server does not support this SMB level, and falsely
		 * claims capability (also get here for DFS case which should be
		 * rare for path not covered on files)
		 */
	}

	desired_access = 0;
	if (OPEN_FMODE(oflags) & FMODE_READ)
		desired_access |= GENERIC_READ; /* is this too little? */
	if (OPEN_FMODE(oflags) & FMODE_WRITE)
		desired_access |= GENERIC_WRITE;

	disposition = FILE_OVERWRITE_IF;
	if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
		disposition = FILE_CREATE;
	else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
		disposition = FILE_OVERWRITE_IF;
//.........这里部分代码省略.........

struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
	    unsigned int flags)
{
	unsigned int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct inode *newInode = NULL;
	char *full_path = NULL;

	xid = get_xid();

	cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
		 parent_dir_inode, direntry->d_name.name, direntry);

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		free_xid(xid);
		return (struct dentry *)tlink;
	}
	pTcon = tlink_tcon(tlink);

	rc = check_name(direntry);
	if (rc)
		goto lookup_out;

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto lookup_out;
	}

	if (direntry->d_inode != NULL) {
		cifs_dbg(FYI, "non-NULL inode in lookup\n");
	} else {
		cifs_dbg(FYI, "NULL inode in lookup\n");
	}
	cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
		 full_path, direntry->d_inode);

	if (pTcon->unix_ext) {
		rc = cifs_get_inode_info_unix(&newInode, full_path,
					      parent_dir_inode->i_sb, xid);
	} else {
		rc = cifs_get_inode_info(&newInode, full_path, NULL,
				parent_dir_inode->i_sb, xid, NULL);
	}

	if ((rc == 0) && (newInode != NULL)) {
		d_add(direntry, newInode);
		/* since paths are not looked up by component - the parent
		   directories are presumed to be good here */
		renew_parental_timestamps(direntry);

	} else if (rc == -ENOENT) {
		rc = 0;
		direntry->d_time = jiffies;
		d_add(direntry, NULL);
	/*	if it was once a directory (but how can we tell?) we could do
		shrink_dcache_parent(direntry); */
	} else if (rc != -EACCES) {
		cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
		/* We special case check for Access Denied - since that
		is a common return code */
	}

lookup_out:
	kfree(full_path);
	cifs_put_tlink(tlink);
	free_xid(xid);
	return ERR_PTR(rc);
}

struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct inode *newInode = NULL;
	char *full_path = NULL;

	xid = GetXid();

	cFYI(1,
	     (" parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry));

	if(nd) {  /* BB removeme */
		cFYI(1,("In lookup nd flags 0x%x open intent flags 0x%x",nd->flags,nd->intent.open.flags));
	} /* BB removeme BB */
	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	pTcon = cifs_sb->tcon;

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL) {
		FreeXid(xid);
		return ERR_PTR(-ENOMEM);
	}

	if (direntry->d_inode != NULL) {
		cFYI(1, (" non-NULL inode in lookup"));
	} else {
		cFYI(1, (" NULL inode in lookup"));
	}
	cFYI(1,
	     (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));

	if (pTcon->ses->capabilities & CAP_UNIX)
		rc = cifs_get_inode_info_unix(&newInode, full_path,
					      parent_dir_inode->i_sb,xid);
	else
		rc = cifs_get_inode_info(&newInode, full_path, NULL,
					 parent_dir_inode->i_sb,xid);

	if ((rc == 0) && (newInode != NULL)) {
		direntry->d_op = &cifs_dentry_ops;
		d_add(direntry, newInode);

		/* since paths are not looked up by component - the parent directories are presumed to be good here */
		renew_parental_timestamps(direntry);

	} else if (rc == -ENOENT) {
		rc = 0;
		d_add(direntry, NULL);
	} else {
		cERROR(1,("Error 0x%x or on cifs_get_inode_info in lookup",rc));
		/* BB special case check for Access Denied - watch security 
		exposure of returning dir info implicitly via different rc 
		if file exists or not but no access BB */
	}

	if (full_path)
		kfree(full_path);
	FreeXid(xid);
	return ERR_PTR(rc);
}

struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
	    struct nameidata *nd)
{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	__u32 oplock = 0;
	__u16 fileHandle = 0;
	bool posix_open = false;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct cifsFileInfo *cfile;
	struct inode *newInode = NULL;
	char *full_path = NULL;
	struct file *filp;

	xid = GetXid();

	cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry);

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	pTcon = cifs_sb->tcon;

	/*
	 * Don't allow the separator character in a path component.
	 * The VFS will not allow "/", but "\" is allowed by posix.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
		int i;
		for (i = 0; i < direntry->d_name.len; i++)
			if (direntry->d_name.name[i] == '\\') {
				cFYI(1, "Invalid file name");
				FreeXid(xid);
				return ERR_PTR(-EINVAL);
			}
	}

	/*
	 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
	 * the VFS handle the create.
	 */
	if (nd && (nd->flags & LOOKUP_EXCL)) {
		d_instantiate(direntry, NULL);
		return NULL;
	}

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return ERR_PTR(-ENOMEM);
	}

	if (direntry->d_inode != NULL) {
		cFYI(1, "non-NULL inode in lookup");
	} else {
		cFYI(1, "NULL inode in lookup");
	}
	cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);

	/* Posix open is only called (at lookup time) for file create now.
	 * For opens (rather than creates), because we do not know if it
	 * is a file or directory yet, and current Samba no longer allows
	 * us to do posix open on dirs, we could end up wasting an open call
	 * on what turns out to be a dir. For file opens, we wait to call posix
	 * open till cifs_open.  It could be added here (lookup) in the future
	 * but the performance tradeoff of the extra network request when EISDIR
	 * or EACCES is returned would have to be weighed against the 50%
	 * reduction in network traffic in the other paths.
	 */
	if (pTcon->unix_ext) {
		if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
		     (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
		     (nd->intent.open.flags & O_CREAT)) {
			rc = cifs_posix_open(full_path, &newInode,
					parent_dir_inode->i_sb,
					nd->intent.open.create_mode,
					nd->intent.open.flags, &oplock,
					&fileHandle, xid);
			/*
			 * The check below works around a bug in POSIX
			 * open in samba versions 3.3.1 and earlier where
			 * open could incorrectly fail with invalid parameter.
			 * If either that or op not supported returned, follow
			 * the normal lookup.
			 */
			if ((rc == 0) || (rc == -ENOENT))
				posix_open = true;
			else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP))
				pTcon->broken_posix_open = true;
		}
		if (!posix_open)
			rc = cifs_get_inode_info_unix(&newInode, full_path,
						parent_dir_inode->i_sb, xid);
	} else
//.........这里部分代码省略.........

static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
					       kuid_t uid, int any)
{
	struct dentry *ds;
	const unsigned char **wnames, *uname;
	int i, n, l, clone, access;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid, *old_fid = NULL;

	v9ses = v9fs_dentry2v9ses(dentry);
	access = v9ses->flags & V9FS_ACCESS_MASK;
	fid = v9fs_fid_find(dentry, uid, any);
	if (fid)
		return fid;
	/*
	 * we don't have a matching fid. To do a TWALK we need
	 * parent fid. We need to prevent rename when we want to
	 * look at the parent.
	 */
	down_read(&v9ses->rename_sem);
	ds = dentry->d_parent;
	fid = v9fs_fid_find(ds, uid, any);
	if (fid) {
		/* Found the parent fid do a lookup with that */
		fid = p9_client_walk(fid, 1, &dentry->d_name.name, 1);
		goto fid_out;
	}
	up_read(&v9ses->rename_sem);

	/* start from the root and try to do a lookup */
	fid = v9fs_fid_find(dentry->d_sb->s_root, uid, any);
	if (!fid) {
		/* the user is not attached to the fs yet */
		if (access == V9FS_ACCESS_SINGLE)
			return ERR_PTR(-EPERM);

		if (v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses))
				uname = NULL;
		else
			uname = v9ses->uname;

		fid = p9_client_attach(v9ses->clnt, NULL, uname, uid,
				       v9ses->aname);
		if (IS_ERR(fid))
			return fid;

		v9fs_fid_add(dentry->d_sb->s_root, fid);
	}
	/* If we are root ourself just return that */
	if (dentry->d_sb->s_root == dentry)
		return fid;
	/*
	 * Do a multipath walk with attached root.
	 * When walking parent we need to make sure we
	 * don't have a parallel rename happening
	 */
	down_read(&v9ses->rename_sem);
	n  = build_path_from_dentry(v9ses, dentry, &wnames);
	if (n < 0) {
		fid = ERR_PTR(n);
		goto err_out;
	}
	clone = 1;
	i = 0;
	while (i < n) {
		l = min(n - i, P9_MAXWELEM);
		/*
		 * We need to hold rename lock when doing a multipath
		 * walk to ensure none of the patch component change
		 */
		fid = p9_client_walk(fid, l, &wnames[i], clone);
		if (IS_ERR(fid)) {
			if (old_fid) {
				/*
				 * If we fail, clunk fid which are mapping
				 * to path component and not the last component
				 * of the path.
				 */
				p9_client_clunk(old_fid);
			}
			kfree(wnames);
			goto err_out;
		}
		old_fid = fid;
		i += l;
		clone = 0;
	}
	kfree(wnames);
fid_out:
	if (!IS_ERR(fid)) {
		spin_lock(&dentry->d_lock);
		if (d_unhashed(dentry)) {
			spin_unlock(&dentry->d_lock);
			p9_client_clunk(fid);
			fid = ERR_PTR(-ENOENT);
		} else {
			__add_fid(dentry, fid);
			spin_unlock(&dentry->d_lock);
		}
	}
//.........这里部分代码省略.........

static void*
cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
{
	struct dfs_info3_param *referrals = NULL;
	unsigned int num_referrals = 0;
	struct cifs_sb_info *cifs_sb;
	struct cifsSesInfo *ses;
	char *full_path = NULL;
	int xid, i;
	int rc = 0;
	struct vfsmount *mnt = ERR_PTR(-ENOENT);

	cFYI(1, ("in %s", __func__));
	BUG_ON(IS_ROOT(dentry));

	xid = GetXid();

	dput(nd->path.dentry);
	nd->path.dentry = dget(dentry);

	cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
	ses = cifs_sb->tcon->ses;

	if (!ses) {
		rc = -EINVAL;
		goto out_err;
	}

	/*
	 * The MSDFS spec states that paths in DFS referral requests and
	 * responses must be prefixed by a single '\' character instead of
	 * the double backslashes usually used in the UNC. This function
	 * gives us the latter, so we must adjust the result.
	 */
	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out_err;
	}

	rc = get_dfs_path(xid, ses , full_path + 1, cifs_sb->local_nls,
		&num_referrals, &referrals,
		cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);

	for (i = 0; i < num_referrals; i++) {
		int len;
		dump_referral(referrals+i);
		/* connect to a node */
		len = strlen(referrals[i].node_name);
		if (len < 2) {
			cERROR(1, ("%s: Net Address path too short: %s",
					__func__, referrals[i].node_name));
			rc = -EINVAL;
			goto out_err;
		}
		mnt = cifs_dfs_do_refmount(nd->path.mnt,
				nd->path.dentry, referrals + i);
		cFYI(1, ("%s: cifs_dfs_do_refmount:%s , mnt:%p", __func__,
					referrals[i].node_name, mnt));

		/* complete mount procedure if we accured submount */
		if (!IS_ERR(mnt))
			break;
	}

	/* we need it cause for() above could exit without valid submount */
	rc = PTR_ERR(mnt);
	if (IS_ERR(mnt))
		goto out_err;

	rc = add_mount_helper(mnt, nd, &cifs_dfs_automount_list);

out:
	FreeXid(xid);
	free_dfs_info_array(referrals, num_referrals);
	kfree(full_path);
	cFYI(1, ("leaving %s" , __func__));
	return ERR_PTR(rc);
out_err:
	path_put(&nd->path);
	goto out;
}

int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, 
		dev_t device_number) 
{
	int rc = -EPERM;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode * newinode = NULL;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL)
		rc = -ENOMEM;
	else if (pTcon->ses->capabilities & CAP_UNIX) {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
				mode,(__u64)current->fsuid,(__u64)current->fsgid,
				device_number, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		} else {
			rc = CIFSSMBUnixSetPerms(xid, pTcon,
				full_path, mode, (__u64)-1, (__u64)-1,
				device_number, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		}

		if(!rc) {
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb,xid);
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			if(rc == 0)
				d_instantiate(direntry, newinode);
		}
	} else {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
			int oplock = 0;
			u16 fileHandle;
			FILE_ALL_INFO * buf;

			cFYI(1,("sfu compat create special file"));

			buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
			if(buf == NULL) {
				kfree(full_path);
				FreeXid(xid);
				return -ENOMEM;
			}

			rc = CIFSSMBOpen(xid, pTcon, full_path,
					 FILE_CREATE, /* fail if exists */
					 GENERIC_WRITE /* BB would 
					  WRITE_OWNER | WRITE_DAC be better? */,
					 /* Create a file and set the
					    file attribute to SYSTEM */
					 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
					 &fileHandle, &oplock, buf,
					 cifs_sb->local_nls,
					 cifs_sb->mnt_cifs_flags & 
					    CIFS_MOUNT_MAP_SPECIAL_CHR);

			/* BB FIXME - add handling for backlevel servers
			   which need legacy open and check for all
			   calls to SMBOpen for fallback to 
			   SMBLeagcyOpen */
			if(!rc) {
				/* BB Do not bother to decode buf since no
				   local inode yet to put timestamps in,
				   but we can reuse it safely */
				int bytes_written;
				struct win_dev *pdev;
				pdev = (struct win_dev *)buf;
				if(S_ISCHR(mode)) {
					memcpy(pdev->type, "IntxCHR", 8);
					pdev->major =
					      cpu_to_le64(MAJOR(device_number));
					pdev->minor = 
					      cpu_to_le64(MINOR(device_number));
					rc = CIFSSMBWrite(xid, pTcon,
						fileHandle,
						sizeof(struct win_dev),
						0, &bytes_written, (char *)pdev,
						NULL, 0);
				} else if(S_ISBLK(mode)) {
					memcpy(pdev->type, "IntxBLK", 8);
					pdev->major =
					      cpu_to_le64(MAJOR(device_number));
					pdev->minor =
//.........这里部分代码省略.........

struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct inode *newInode = NULL;
	char *full_path = NULL;

	xid = GetXid();

	cFYI(1,
	     (" parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry));

	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	pTcon = cifs_sb->tcon;

	/*
	 * Don't allow the separator character in a path component.
	 * The VFS will not allow "/", but "\" is allowed by posix.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
		int i;
		for (i = 0; i < direntry->d_name.len; i++)
			if (direntry->d_name.name[i] == '\\') {
				cFYI(1, ("Invalid file name"));
				FreeXid(xid);
				return ERR_PTR(-EINVAL);
			}
	}

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL) {
		FreeXid(xid);
		return ERR_PTR(-ENOMEM);
	}

	if (direntry->d_inode != NULL) {
		cFYI(1, (" non-NULL inode in lookup"));
	} else {
		cFYI(1, (" NULL inode in lookup"));
	}
	cFYI(1,
	     (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));

	if (pTcon->ses->capabilities & CAP_UNIX)
		rc = cifs_get_inode_info_unix(&newInode, full_path,
					      parent_dir_inode->i_sb,xid);
	else
		rc = cifs_get_inode_info(&newInode, full_path, NULL,
					 parent_dir_inode->i_sb,xid);

	if ((rc == 0) && (newInode != NULL)) {
		if (pTcon->nocase)
			direntry->d_op = &cifs_ci_dentry_ops;
		else
			direntry->d_op = &cifs_dentry_ops;
		d_add(direntry, newInode);

		/* since paths are not looked up by component - the parent 
		   directories are presumed to be good here */
		renew_parental_timestamps(direntry);

	} else if (rc == -ENOENT) {
		rc = 0;
		direntry->d_time = jiffies;
		if (pTcon->nocase)
			direntry->d_op = &cifs_ci_dentry_ops;
		else
			direntry->d_op = &cifs_dentry_ops;
		d_add(direntry, NULL);
	/*	if it was once a directory (but how can we tell?) we could do  
			shrink_dcache_parent(direntry); */
	} else {
		cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
			   rc,full_path));
		/* BB special case check for Access Denied - watch security 
		exposure of returning dir info implicitly via different rc 
		if file exists or not but no access BB */
	}

	kfree(full_path);
	FreeXid(xid);
	return ERR_PTR(rc);
}

int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	int oplock = 0;
	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	FILE_ALL_INFO * buf = NULL;
	struct inode *newinode = NULL;
	struct cifsFileInfo * pCifsFile = NULL;
	struct cifsInodeInfo * pCifsInode;
	int disposition = FILE_OVERWRITE_IF;
	int write_only = FALSE;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	if(nd && (nd->flags & LOOKUP_OPEN)) {
		int oflags = nd->intent.open.flags;

		desiredAccess = 0;
		if (oflags & FMODE_READ)
			desiredAccess |= GENERIC_READ;
		if (oflags & FMODE_WRITE) {
			desiredAccess |= GENERIC_WRITE;
			if (!(oflags & FMODE_READ))
				write_only = TRUE;
		}

		if((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if((oflags & O_CREAT) == O_CREAT)
			disposition = FILE_OPEN_IF;
		else {
			cFYI(1,("Create flag not set in create function"));
		}
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
	if (oplockEnabled)
		oplock = REQ_OPLOCK;

	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	if(buf == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}
	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) 
		rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
			 desiredAccess, CREATE_NOT_DIR,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if(rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
			desiredAccess, CREATE_NOT_DIR,
			&fileHandle, &oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} 
	if (rc) {
		cFYI(1, ("cifs_create returned 0x%x", rc));
	} else {
		/* If Open reported that we actually created a file
		then we now have to set the mode if possible */
		if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
			(oplock & CIFS_CREATE_ACTION))
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)current->fsuid,
					(__u64)current->fsgid,
					0 /* dev */,
					cifs_sb->local_nls, 
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			} else {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)-1,
					(__u64)-1,
					0 /* dev */,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags & 
//.........这里部分代码省略.........

int cifs_setxattr(struct dentry *direntry, const char *ea_name,
		  const void *ea_value, size_t value_size, int flags)
{
	int rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	unsigned int xid;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct super_block *sb;
	char *full_path;

	if (direntry == NULL)
		return -EIO;
	if (direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if (sb == NULL)
		return -EIO;

	cifs_sb = CIFS_SB(sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto set_ea_exit;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */
	if (value_size > MAX_EA_VALUE_SIZE) {
		cifs_dbg(FYI, "size of EA value too large\n");
		rc = -EOPNOTSUPP;
		goto set_ea_exit;
	}

	if (ea_name == NULL) {
		cifs_dbg(FYI, "Null xattr names not supported\n");
	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
		   == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto set_ea_exit;
		if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
			cifs_dbg(FYI, "attempt to set cifs inode metadata\n");

		ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
		if (pTcon->ses->server->ops->set_EA)
			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
				full_path, ea_name, ea_value, (__u16)value_size,
				cifs_sb->local_nls, cifs_remap(cifs_sb));
	} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
		   == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto set_ea_exit;

		ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
		if (pTcon->ses->server->ops->set_EA)
			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
				full_path, ea_name, ea_value, (__u16)value_size,
				cifs_sb->local_nls, cifs_remap(cifs_sb));
	} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
			strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
#ifdef CONFIG_CIFS_ACL
		struct cifs_ntsd *pacl;
		pacl = kmalloc(value_size, GFP_KERNEL);
		if (!pacl) {
			rc = -ENOMEM;
		} else {
			memcpy(pacl, ea_value, value_size);
			if (pTcon->ses->server->ops->set_acl)
				rc = pTcon->ses->server->ops->set_acl(pacl,
						value_size, direntry->d_inode,
						full_path, CIFS_ACL_DACL);
			else
				rc = -EOPNOTSUPP;
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(direntry->d_inode)->time = 0;
			kfree(pacl);
		}
#else
		cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
#endif /* CONFIG_CIFS_ACL */
	} else {
		int temp;
		temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
			strlen(POSIX_ACL_XATTR_ACCESS));
		if (temp == 0) {
#ifdef CONFIG_CIFS_POSIX
			if (sb->s_flags & MS_POSIXACL)
				rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
					ea_value, (const int)value_size,
//.........这里部分代码省略.........

ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
	void *ea_value, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	unsigned int xid;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct super_block *sb;
	char *full_path;

	if (direntry == NULL)
		return -EIO;
	if (direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if (sb == NULL)
		return -EIO;

	cifs_sb = CIFS_SB(sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto get_ea_exit;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */
	if (ea_name == NULL) {
		cifs_dbg(FYI, "Null xattr names not supported\n");
	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
		   == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
			cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
			/* revalidate/getattr then populate from inode */
		} /* BB add else when above is implemented */
		ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
		if (pTcon->ses->server->ops->query_all_EAs)
			rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, ea_name, ea_value, buf_size,
				cifs_sb->local_nls, cifs_remap(cifs_sb));
	} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
		if (pTcon->ses->server->ops->query_all_EAs)
			rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, ea_name, ea_value, buf_size,
				cifs_sb->local_nls, cifs_remap(cifs_sb));
	} else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
			  strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#else
		cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
#endif /* CONFIG_CIFS_POSIX */
	} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
			  strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#else
		cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
#endif /* CONFIG_CIFS_POSIX */
	} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
				strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
#ifdef CONFIG_CIFS_ACL
			u32 acllen;
			struct cifs_ntsd *pacl;

			if (pTcon->ses->server->ops->get_acl == NULL)
				goto get_ea_exit; /* rc already EOPNOTSUPP */

			pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
					direntry->d_inode, full_path, &acllen);
			if (IS_ERR(pacl)) {
				rc = PTR_ERR(pacl);
				cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
					 __func__, rc);
			} else {
				if (ea_value) {
					if (acllen > buf_size)
//.........这里部分代码省略.........

static int
initiate_cifs_search(const unsigned int xid, struct file *file)
{
	__u16 search_flags;
	int rc = 0;
	char *full_path = NULL;
	struct cifsFileInfo *cifsFile;
	struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
	struct tcon_link *tlink = NULL;
	struct cifs_tcon *tcon;
	struct TCP_Server_Info *server;

	if (file->private_data == NULL) {
		tlink = cifs_sb_tlink(cifs_sb);
		if (IS_ERR(tlink))
			return PTR_ERR(tlink);

		cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
		if (cifsFile == NULL) {
			rc = -ENOMEM;
			goto error_exit;
		}
		file->private_data = cifsFile;
		cifsFile->tlink = cifs_get_tlink(tlink);
		tcon = tlink_tcon(tlink);
	} else {
		cifsFile = file->private_data;
		tcon = tlink_tcon(cifsFile->tlink);
	}

	server = tcon->ses->server;

	if (!server->ops->query_dir_first) {
		rc = -ENOSYS;
		goto error_exit;
	}

	cifsFile->invalidHandle = true;
	cifsFile->srch_inf.endOfSearch = false;

	full_path = build_path_from_dentry(file->f_path.dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto error_exit;
	}

	cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);

ffirst_retry:
	/* test for Unix extensions */
	/* but now check for them on the share/mount not on the SMB session */
	/* if (cap_unix(tcon->ses) { */
	if (tcon->unix_ext)
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
	else if ((tcon->ses->capabilities &
		  tcon->ses->server->vals->cap_nt_find) == 0) {
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
	} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
	} else /* not srvinos - BB fixme add check for backlevel? */ {
		cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
	}

	search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
	if (backup_cred(cifs_sb))
		search_flags |= CIFS_SEARCH_BACKUP_SEARCH;

	rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
					  &cifsFile->fid, search_flags,
					  &cifsFile->srch_inf);

	if (rc == 0)
		cifsFile->invalidHandle = false;
	/* BB add following call to handle readdir on new NTFS symlink errors
	else if STATUS_STOPPED_ON_SYMLINK
		call get_symlink_reparse_path and retry with new path */
	else if ((rc == -EOPNOTSUPP) &&
		(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
		goto ffirst_retry;
	}
error_exit:
	kfree(full_path);
	cifs_put_tlink(tlink);
	return rc;
}

static int initiate_cifs_search(const int xid, struct file *file)
{
	int rc = 0;
	char *full_path;
	struct cifsFileInfo *cifsFile;
	struct c