C++ cERROR函数代码示例

//.........这里部分代码省略.........
		rc = 0;
		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) {
		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.file->f_flags & O_CREAT)) {
			rc = cifs_posix_open(full_path, &newInode,
					parent_dir_inode->i_sb,
					nd->intent.open.create_mode,
					nd->intent.open.file->f_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
		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);
		if (posix_open) {
			filp = lookup_instantiate_filp(nd, direntry,
						       generic_file_open);
			if (IS_ERR(filp)) {
				rc = PTR_ERR(filp);
				CIFSSMBClose(xid, pTcon, fileHandle);
				goto lookup_out;
			}

			cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
						  oplock);
			if (cfile == NULL) {
				fput(filp);
				CIFSSMBClose(xid, pTcon, fileHandle);
				rc = -ENOMEM;
				goto lookup_out;
			}
		}
		/* 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) {
		cERROR(1, "Unexpected lookup error %d", rc);
		/* We special case check for Access Denied - since that
		is a common return code */
	}

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

static int __init
init_cifs(void)
{
    int rc = 0;
    cifs_proc_init();
    INIT_LIST_HEAD(&cifs_tcp_ses_list);
    INIT_LIST_HEAD(&GlobalOplock_Q);
#ifdef CONFIG_CIFS_EXPERIMENTAL
    INIT_LIST_HEAD(&GlobalDnotifyReqList);
    INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
#endif
    /*
     *  Initialize Global counters
     */
    atomic_set(&sesInfoAllocCount, 0);
    atomic_set(&tconInfoAllocCount, 0);
    atomic_set(&tcpSesAllocCount, 0);
    atomic_set(&tcpSesReconnectCount, 0);
    atomic_set(&tconInfoReconnectCount, 0);

    atomic_set(&bufAllocCount, 0);
    atomic_set(&smBufAllocCount, 0);
#ifdef CONFIG_CIFS_STATS2
    atomic_set(&totBufAllocCount, 0);
    atomic_set(&totSmBufAllocCount, 0);
#endif /* CONFIG_CIFS_STATS2 */

    atomic_set(&midCount, 0);
    GlobalCurrentXid = 0;
    GlobalTotalActiveXid = 0;
    GlobalMaxActiveXid = 0;
    memset(Local_System_Name, 0, 15);
    rwlock_init(&GlobalSMBSeslock);
    rwlock_init(&cifs_tcp_ses_lock);
    spin_lock_init(&GlobalMid_Lock);

    if (cifs_max_pending < 2) {
        cifs_max_pending = 2;
        cFYI(1, ("cifs_max_pending set to min of 2"));
    } else if (cifs_max_pending > 256) {
        cifs_max_pending = 256;
        cFYI(1, ("cifs_max_pending set to max of 256"));
    }

    rc = cifs_init_inodecache();
    if (rc)
        goto out_clean_proc;

    rc = cifs_init_mids();
    if (rc)
        goto out_destroy_inodecache;

    rc = cifs_init_request_bufs();
    if (rc)
        goto out_destroy_mids;

    rc = register_filesystem(&cifs_fs_type);
    if (rc)
        goto out_destroy_request_bufs;
#ifdef CONFIG_CIFS_UPCALL
    rc = register_key_type(&cifs_spnego_key_type);
    if (rc)
        goto out_unregister_filesystem;
#endif
#ifdef CONFIG_CIFS_DFS_UPCALL
    rc = register_key_type(&key_type_dns_resolver);
    if (rc)
        goto out_unregister_key_type;
#endif
    oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
    if (IS_ERR(oplockThread)) {
        rc = PTR_ERR(oplockThread);
        cERROR(1, ("error %d create oplock thread", rc));
        goto out_unregister_dfs_key_type;
    }

    return 0;

out_unregister_dfs_key_type:
#ifdef CONFIG_CIFS_DFS_UPCALL
    unregister_key_type(&key_type_dns_resolver);
out_unregister_key_type:
#endif
#ifdef CONFIG_CIFS_UPCALL
    unregister_key_type(&cifs_spnego_key_type);
out_unregister_filesystem:
#endif
    unregister_filesystem(&cifs_fs_type);
out_destroy_request_bufs:
    cifs_destroy_request_bufs();
out_destroy_mids:
    cifs_destroy_mids();
out_destroy_inodecache:
    cifs_destroy_inodecache();
out_clean_proc:
    cifs_proc_clean();
    return rc;
}

/* We start counting in the buffer with entry 2 and increment for every
   entry (do not increment for . or .. entry) */
static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
	struct file *file, char **ppCurrentEntry, int *num_to_ret)
{
	int rc = 0;
	int pos_in_buf = 0;
	loff_t first_entry_in_buffer;
	loff_t index_to_find = file->f_pos;
	struct cifsFileInfo *cifsFile = file->private_data;
	/* check if index in the buffer */

	if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
	   (num_to_ret == NULL))
		return -ENOENT;

	*ppCurrentEntry = NULL;
	first_entry_in_buffer =
		cifsFile->srch_inf.index_of_last_entry -
			cifsFile->srch_inf.entries_in_buffer;

	/* if first entry in buf is zero then is first buffer
	in search response data which means it is likely . and ..
	will be in this buffer, although some servers do not return
	. and .. for the root of a drive and for those we need
	to start two entries earlier */

	dump_cifs_file_struct(file, "In fce ");
	if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
	     is_dir_changed(file)) ||
	   (index_to_find < first_entry_in_buffer)) {
		/* close and restart search */
		cFYI(1, ("search backing up - close and restart search"));
		if (!cifsFile->srch_inf.endOfSearch &&
		    !cifsFile->invalidHandle) {
			cifsFile->invalidHandle = true;
			CIFSFindClose(xid, pTcon, cifsFile->netfid);
		}
		if (cifsFile->srch_inf.ntwrk_buf_start) {
			cFYI(1, ("freeing SMB ff cache buf on search rewind"));
			if (cifsFile->srch_inf.smallBuf)
				cifs_small_buf_release(cifsFile->srch_inf.
						ntwrk_buf_start);
			else
				cifs_buf_release(cifsFile->srch_inf.
						ntwrk_buf_start);
			cifsFile->srch_inf.ntwrk_buf_start = NULL;
		}
		rc = initiate_cifs_search(xid, file);
		if (rc) {
			cFYI(1, ("error %d reinitiating a search on rewind",
				 rc));
			return rc;
		}
		cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
	}

	while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
	      (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
		cFYI(1, ("calling findnext2"));
		rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
				  &cifsFile->srch_inf);
		cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
		if (rc)
			return -ENOENT;
	}
	if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
		/* we found the buffer that contains the entry */
		/* scan and find it */
		int i;
		char *current_entry;
		char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
			smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);

		current_entry = cifsFile->srch_inf.srch_entries_start;
		first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
					- cifsFile->srch_inf.entries_in_buffer;
		pos_in_buf = index_to_find - first_entry_in_buffer;
		cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));

		for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
			/* go entry by entry figuring out which is first */
			current_entry = nxt_dir_entry(current_entry, end_of_smb,
						cifsFile->srch_inf.info_level);
		}
		if ((current_entry == NULL) && (i < pos_in_buf)) {
			/* BB fixme - check if we should flag this error */
			cERROR(1, ("reached end of buf searching for pos in buf"
			  " %d index to find %lld rc %d",
			  pos_in_buf, index_to_find, rc));
		}
		rc = 0;
		*ppCurrentEntry = current_entry;
	} else {
		cFYI(1, ("index not in buffer - could not findnext into it"));
		return 0;
	}

	if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
//.........这里部分代码省略.........

int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
{
	int rc = 0;
	int xid, i;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct cifsFileInfo *cifsFile = NULL;
	char *current_entry;
	int num_to_fill = 0;
	char *tmp_buf = NULL;
	char *end_of_smb;
	int max_len;

	xid = GetXid();

	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
	pTcon = cifs_sb->tcon;
	if (pTcon == NULL)
		return -EINVAL;

	switch ((int) file->f_pos) {
	case 0:
		if (filldir(direntry, ".", 1, file->f_pos,
		     file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
			cERROR(1, ("Filldir for current dir failed"));
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	case 1:
		if (filldir(direntry, "..", 2, file->f_pos,
		     file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
			cERROR(1, ("Filldir for parent dir failed"));
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	default:
		/* 1) If search is active,
			is in current search buffer?
			if it before then restart search
			if after then keep searching till find it */

		if (file->private_data == NULL) {
			rc = initiate_cifs_search(xid, file);
			cFYI(1, ("initiate cifs search rc %d", rc));
			if (rc) {
				FreeXid(xid);
				return rc;
			}
		}
		if (file->private_data == NULL) {
			rc = -EINVAL;
			FreeXid(xid);
			return rc;
		}
		cifsFile = file->private_data;
		if (cifsFile->srch_inf.endOfSearch) {
			if (cifsFile->srch_inf.emptyDir) {
				cFYI(1, ("End of search, empty dir"));
				rc = 0;
				break;
			}
		} /* else {
			cifsFile->invalidHandle = true;
			CIFSFindClose(xid, pTcon, cifsFile->netfid);
		} */

		rc = find_cifs_entry(xid, pTcon, file,
				&current_entry, &num_to_fill);
		if (rc) {
			cFYI(1, ("fce error %d", rc));
			goto rddir2_exit;
		} else if (current_entry != NULL) {
			cFYI(1, ("entry %lld found", file->f_pos));
		} else {
			cFYI(1, ("could not find entry"));
			goto rddir2_exit;
		}
		cFYI(1, ("loop through %d times filling dir for net buf %p",
			num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
		max_len = smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);
		end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;

		/* To be safe - for UCS to UTF-8 with strings loaded
		with the rare long characters alloc more to account for
		such multibyte target UTF-8 characters. cifs_unicode.c,
		which actually does the conversion, has the same limit */
		tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
		for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
			if (current_entry == NULL) {
				/* evaluate whether this case is an error */
				cERROR(1, ("past SMB end,  num to fill %d i %d",
					  num_to_fill, i));
				break;
			}
			/* if buggy server returns . and .. late do
			we want to check for that here? */
			rc = cifs_filldir(current_entry, file,
//.........这里部分代码省略.........

int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
{
	int rc = 0;
	int xid, i;
	struct cifs_tcon *pTcon;
	struct cifsFileInfo *cifsFile = NULL;
	char *current_entry;
	int num_to_fill = 0;
	char *tmp_buf = NULL;
	char *end_of_smb;
	unsigned int max_len;

	xid = GetXid();

	/*
	 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
	 * '..'. Otherwise we won't be able to notify VFS in case of failure.
	 */
	if (file->private_data == NULL) {
		rc = initiate_cifs_search(xid, file);
		cFYI(1, "initiate cifs search rc %d", rc);
		if (rc)
			goto rddir2_exit;
	}

	switch ((int) file->f_pos) {
	case 0:
		if (filldir(direntry, ".", 1, file->f_pos,
		     file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
			cERROR(1, "Filldir for current dir failed");
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	case 1:
		if (filldir(direntry, "..", 2, file->f_pos,
		     parent_ino(file->f_path.dentry), DT_DIR) < 0) {
			cERROR(1, "Filldir for parent dir failed");
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	default:
		/* 1) If search is active,
			is in current search buffer?
			if it before then restart search
			if after then keep searching till find it */

		if (file->private_data == NULL) {
			rc = -EINVAL;
			FreeXid(xid);
			return rc;
		}
		cifsFile = file->private_data;
		if (cifsFile->srch_inf.endOfSearch) {
			if (cifsFile->srch_inf.emptyDir) {
				cFYI(1, "End of search, empty dir");
				rc = 0;
				break;
			}
		} /* else {
			cifsFile->invalidHandle = true;
			CIFSFindClose(xid, pTcon, cifsFile->netfid);
		} */

		pTcon = tlink_tcon(cifsFile->tlink);
		rc = find_cifs_entry(xid, pTcon, file,
				&current_entry, &num_to_fill);
		if (rc) {
			cFYI(1, "fce error %d", rc);
			goto rddir2_exit;
		} else if (current_entry != NULL) {
			cFYI(1, "entry %lld found", file->f_pos);
		} else {
			cFYI(1, "could not find entry");
			goto rddir2_exit;
		}
		cFYI(1, "loop through %d times filling dir for net buf %p",
			num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
		max_len = smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);
		end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;

		tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
		if (tmp_buf == NULL) {
			rc = -ENOMEM;
			break;
		}

		for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
			if (current_entry == NULL) {
				/* evaluate whether this case is an error */
				cERROR(1, "past SMB end,  num to fill %d i %d",
					  num_to_fill, i);
				break;
			}
			/* if buggy server returns . and .. late do
			we want to check for that here? */
			rc = cifs_filldir(current_entry, file,
					filldir, direntry, tmp_buf, max_len);
//.........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);
}

static int __init
init_cifs(void)
{
	int rc = 0;
#ifdef CONFIG_PROC_FS
	cifs_proc_init();
#endif
	INIT_LIST_HEAD(&GlobalServerList);	/* BB not implemented yet */
	INIT_LIST_HEAD(&GlobalSMBSessionList);
	INIT_LIST_HEAD(&GlobalTreeConnectionList);
	INIT_LIST_HEAD(&GlobalOplock_Q);
/*
 *  Initialize Global counters
 */
	atomic_set(&sesInfoAllocCount, 0);
	atomic_set(&tconInfoAllocCount, 0);
	atomic_set(&tcpSesAllocCount,0);
	atomic_set(&tcpSesReconnectCount, 0);
	atomic_set(&tconInfoReconnectCount, 0);

	atomic_set(&bufAllocCount, 0);
	atomic_set(&midCount, 0);
	GlobalCurrentXid = 0;
	GlobalTotalActiveXid = 0;
	GlobalMaxActiveXid = 0;
	rwlock_init(&GlobalSMBSeslock);
	spin_lock_init(&GlobalMid_Lock);

	if(cifs_max_pending < 2) {
		cifs_max_pending = 2;
		cFYI(1,("cifs_max_pending set to min of 2"));
	} else if(cifs_max_pending > 256) {
		cifs_max_pending = 256;
		cFYI(1,("cifs_max_pending set to max of 256"));
	}

	rc = cifs_init_inodecache();
	if (!rc) {
		rc = cifs_init_mids();
		if (!rc) {
			rc = cifs_init_request_bufs();
			if (!rc) {
				rc = register_filesystem(&cifs_fs_type);
				if (!rc) {                
					rc = (int)kernel_thread(cifs_oplock_thread, NULL, 
						CLONE_FS | CLONE_FILES | CLONE_VM);
					if(rc > 0)
						return 0;
					else 
						cERROR(1,("error %d create oplock thread",rc));
				}
				cifs_destroy_request_bufs();
			}
			cifs_destroy_mids();
		}
		cifs_destroy_inodecache();
	}
#ifdef CONFIG_PROC_FS
	cifs_proc_clean();
#endif
	return rc;
}

static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
		void *dirent, char *scratch_buf, unsigned int max_len)
{
	struct cifsFileInfo *file_info = file->private_data;
	struct super_block *sb = file->f_path.dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifs_dirent de = { NULL, };
	struct cifs_fattr fattr;
	struct dentry *dentry;
	struct qstr name;
	int rc = 0;
	ino_t ino;

	rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
			      file_info->srch_inf.unicode);
	if (rc)
		return rc;

	if (de.namelen > max_len) {
		cERROR(1, "bad search response length %zd past smb end",
			  de.namelen);
		return -EINVAL;
	}

	/* skip . and .. since we added them first */
	if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
		return 0;

	if (file_info->srch_inf.unicode) {
		struct nls_table *nlt = cifs_sb->local_nls;

		name.name = scratch_buf;
		name.len =
			cifs_from_ucs2((char *)name.name, (__le16 *)de.name,
				       UNICODE_NAME_MAX,
				       min(de.namelen, (size_t)max_len), nlt,
				       cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
		name.len -= nls_nullsize(nlt);
	} else {
		name.name = de.name;
		name.len = de.namelen;
	}

	switch (file_info->srch_inf.info_level) {
	case SMB_FIND_FILE_UNIX:
		cifs_unix_basic_to_fattr(&fattr,
					 &((FILE_UNIX_INFO *)find_entry)->basic,
					 cifs_sb);
		break;
	case SMB_FIND_FILE_INFO_STANDARD:
		cifs_std_info_to_fattr(&fattr,
				       (FIND_FILE_STANDARD_INFO *)find_entry,
				       cifs_sb);
		break;
	default:
		cifs_dir_info_to_fattr(&fattr,
				       (FILE_DIRECTORY_INFO *)find_entry,
				       cifs_sb);
		break;
	}

	if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
		fattr.cf_uniqueid = de.ino;
	} else {
		fattr.cf_uniqueid = iunique(sb, ROOT_I);
		cifs_autodisable_serverino(cifs_sb);
	}

	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
	    CIFSCouldBeMFSymlink(&fattr))
		/*
		 * trying to get the type and mode can be slow,
		 * so just call those regular files for now, and mark
		 * for reval
		 */
		fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;

	ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
	dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);

	rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
		     fattr.cf_dtype);

	dput(dentry);
	return rc;
}

static int
cifs_read_super(struct super_block *sb, void *data,
		const char *devname, int silent)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	int rc = 0;

	sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
	sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
	cifs_sb = CIFS_SB(sb);
	if(cifs_sb == NULL)
		return -ENOMEM;
	else
		memset(cifs_sb,0,sizeof(struct cifs_sb_info));
	

	rc = cifs_mount(sb, cifs_sb, data, devname);

	if (rc) {
		if (!silent)
			cERROR(1,
			       ("cifs_mount failed w/return code = %d", rc));
		goto out_mount_failed;
	}

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
/*	if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
	    sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
#ifdef CONFIG_CIFS_QUOTA
	sb->s_qcop = &cifs_quotactl_ops;
#endif
	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = iget(sb, ROOT_I);

	if (!inode) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	sb->s_root = d_alloc_root(inode);

	if (!sb->s_root) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	return 0;

out_no_root:
	cERROR(1, ("cifs_read_super: get root inode failed"));
	if (inode)
		iput(inode);

out_mount_failed:
	if(cifs_sb) {
		if(cifs_sb->local_nls)
			unload_nls(cifs_sb->local_nls);	
		kfree(cifs_sb);
	}
	return rc;
}

/*
 * Create a vfsmount that we can automount
 */
static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
{
	struct dfs_info3_param *referrals = NULL;
	unsigned int num_referrals = 0;
	struct cifs_sb_info *cifs_sb;
	struct cifs_ses *ses;
	char *full_path;
	int xid, i;
	int rc;
	struct vfsmount *mnt;
	struct tcon_link *tlink;

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

	/*
	 * 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.
	 */
	mnt = ERR_PTR(-ENOMEM);
	full_path = build_path_from_dentry(mntpt);
	if (full_path == NULL)
		goto cdda_exit;

	cifs_sb = CIFS_SB(mntpt->d_inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		mnt = ERR_CAST(tlink);
		goto free_full_path;
	}
	ses = tlink_tcon(tlink)->ses;

	xid = GetXid();
	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);
	FreeXid(xid);

	cifs_put_tlink(tlink);

	mnt = ERR_PTR(-ENOENT);
	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);
			mnt = ERR_PTR(-EINVAL);
			break;
		}
		mnt = cifs_dfs_do_refmount(cifs_sb,
				full_path, referrals + i);
		cFYI(1, "%s: cifs_dfs_do_refmount:%s , mnt:%p", __func__,
					referrals[i].node_name, mnt);
		if (!IS_ERR(mnt))
			goto success;
	}

	/* no valid submounts were found; return error from get_dfs_path() by
	 * preference */
	if (rc != 0)
		mnt = ERR_PTR(rc);

success:
	free_dfs_info_array(referrals, num_referrals);
free_full_path:
	kfree(full_path);
cdda_exit:
	cFYI(1, "leaving %s" , __func__);
	return mnt;
}

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;
}

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
	int namelen;
	int pplen;
	char *full_path;
	char dirsep;

	if(direntry == NULL)
		return NULL;  /* not much we can do if dentry is freed and
		we need to reopen the file after it was closed implicitly
		when the server crashed */

	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
	pplen = CIFS_SB(direntry->d_sb)->prepathlen;
cifs_bp_rename_retry:
	namelen = pplen; 
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen += (1 + temp->d_name.len);
		temp = temp->d_parent;
		if(temp == NULL) {
			cERROR(1,("corrupt dentry"));
			return NULL;
		}
	}

	full_path = kmalloc(namelen+1, GFP_KERNEL);
	if(full_path == NULL)
		return full_path;
	full_path[namelen] = 0;	/* trailing null */
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen -= 1 + temp->d_name.len;
		if (namelen < 0) {
			break;
		} else {
			full_path[namelen] = dirsep;
			strncpy(full_path + namelen + 1, temp->d_name.name,
				temp->d_name.len);
			cFYI(0, ("name: %s", full_path + namelen));
		}
		temp = temp->d_parent;
		if(temp == NULL) {
			cERROR(1,("corrupt dentry"));
			kfree(full_path);
			return NULL;
		}
	}
	if (namelen != pplen) {
		cERROR(1,
		       ("did not end path lookup where expected namelen is %d",
			namelen));
		/* presumably this is only possible if racing with a rename 
		of one of the parent directories  (we can not lock the dentries
		above us to prevent this, but retrying should be harmless) */
		kfree(full_path);
		goto cifs_bp_rename_retry;
	}
	/* DIR_SEP already set for byte  0 / vs \ but not for
	   subsequent slashes in prepath which currently must
	   be entered the right way - not sure if there is an alternative
	   since the '\' is a valid posix character so we can not switch
	   those safely to '/' if any are found in the middle of the prepath */
	/* BB test paths to Windows with '/' in the midst of prepath */
	strncpy(full_path,CIFS_SB(direntry->d_sb)->prepath,pplen);
	return full_path;
}

/* Resolves server name to ip address.
 * input:
 * 	unc - server UNC
 * output:
 * 	*ip_addr - pointer to server ip, caller responcible for freeing it.
 * return 0 on success
 */
int
dns_resolve_server_name_to_ip(const char *unc, char **ip_addr)
{
	const struct cred *saved_cred;
	int rc = -EAGAIN;
	struct key *rkey = ERR_PTR(-EAGAIN);
	char *name;
	char *data = NULL;
	int len;

	if (!ip_addr || !unc)
		return -EINVAL;

	/* search for server name delimiter */
	len = strlen(unc);
	if (len < 3) {
		cFYI(1, "%s: unc is too short: %s", __func__, unc);
		return -EINVAL;
	}
	len -= 2;
	name = memchr(unc+2, '\\', len);
	if (!name) {
		cFYI(1, "%s: probably server name is whole unc: %s",
					__func__, unc);
	} else {
		len = (name - unc) - 2/* leading // */;
	}

	name = kmalloc(len+1, GFP_KERNEL);
	if (!name) {
		rc = -ENOMEM;
		return rc;
	}
	memcpy(name, unc+2, len);
	name[len] = 0;

	if (is_ip(name)) {
		cFYI(1, "%s: it is IP, skipping dns upcall: %s",
					__func__, name);
		data = name;
		goto skip_upcall;
	}

	saved_cred = override_creds(dns_resolver_cache);
	rkey = request_key(&key_type_dns_resolver, name, "");
	revert_creds(saved_cred);
	if (!IS_ERR(rkey)) {
		if (!(rkey->perm & KEY_USR_VIEW)) {
			down_read(&rkey->sem);
			rkey->perm |= KEY_USR_VIEW;
			up_read(&rkey->sem);
		}
		len = rkey->type_data.x[0];
		data = rkey->payload.data;
	} else {
		cERROR(1, "%s: unable to resolve: %s", __func__, name);
		goto out;
	}

skip_upcall:
	if (data) {
		*ip_addr = kmalloc(len + 1, GFP_KERNEL);
		if (*ip_addr) {
			memcpy(*ip_addr, data, len + 1);
			if (!IS_ERR(rkey))
				cFYI(1, "%s: resolved: %s to %s", __func__,
							name,
							*ip_addr
					);
			rc = 0;
		} else {
			rc = -ENOMEM;
		}
		if (!IS_ERR(rkey))
			key_put(rkey);
	}

out:
	kfree(name);
	return rc;
}

/* inode num, inode type and filename returned */
static int cifs_get_name_from_search_buf(struct qstr *pqst,
	char *current_entry, __u16 level, unsigned int unicode,
	struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
{
	int rc = 0;
	unsigned int len = 0;
	char *filename;
	struct nls_table *nlt = cifs_sb->local_nls;

	*pinum = 0;

	if (level == SMB_FIND_FILE_UNIX) {
		FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;

		filename = &pFindData->FileName[0];
		if (unicode) {
			len = cifs_unicode_bytelen(filename);
		} else {
			/* BB should we make this strnlen of PATH_MAX? */
			len = strnlen(filename, PATH_MAX);
		}

		/* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
			*pinum = pFindData->UniqueId;
	} else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
		FILE_DIRECTORY_INFO *pFindData =
			(FILE_DIRECTORY_INFO *)current_entry;
		filename = &pFindData->FileName[0];
		len = le32_to_cpu(pFindData->FileNameLength);
	} else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
		FILE_FULL_DIRECTORY_INFO *pFindData =
			(FILE_FULL_DIRECTORY_INFO *)current_entry;
		filename = &pFindData->FileName[0];
		len = le32_to_cpu(pFindData->FileNameLength);
	} else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
		SEARCH_ID_FULL_DIR_INFO *pFindData =
			(SEARCH_ID_FULL_DIR_INFO *)current_entry;
		filename = &pFindData->FileName[0];
		len = le32_to_cpu(pFindData->FileNameLength);
		*pinum = pFindData->UniqueId;
	} else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
		FILE_BOTH_DIRECTORY_INFO *pFindData =
			(FILE_BOTH_DIRECTORY_INFO *)current_entry;
		filename = &pFindData->FileName[0];
		len = le32_to_cpu(pFindData->FileNameLength);
	} else if (level == SMB_FIND_FILE_INFO_STANDARD) {
		FIND_FILE_STANDARD_INFO *pFindData =
			(FIND_FILE_STANDARD_INFO *)current_entry;
		filename = &pFindData->FileName[0];
		/* one byte length, no name conversion */
		len = (unsigned int)pFindData->FileNameLength;
	} else {
		cFYI(1, ("Unknown findfirst level %d", level));
		return -EINVAL;
	}

	if (len > max_len) {
		cERROR(1, ("bad search response length %d past smb end", len));
		return -EINVAL;
	}

	if (unicode) {
		/* BB fixme - test with long names */
		/* Note converted filename can be longer than in unicode */
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
			pqst->len = cifs_convertUCSpath((char *)pqst->name,
					(__le16 *)filename, len/2, nlt);
		else
			pqst->len = cifs_strfromUCS_le((char *)pqst->name,
					(__le16 *)filename, len/2, nlt);
	} else {
		pqst->name = filename;
		pqst->len = len;
	}
	pqst->hash = full_name_hash(pqst->name, pqst->len);
/*	cFYI(1, ("filldir on %s",pqst->name));  */
	return rc;
}

static int
smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
{
	int rc = 0;
	int i = 0;
	struct msghdr smb_msg;
	struct smb_hdr *smb_buffer = iov[0].iov_base;
	unsigned int len = iov[0].iov_len;
	unsigned int total_len;
	int first_vec = 0;
	unsigned int smb_buf_length = be32_to_cpu(smb_buffer->smb_buf_length);
	struct socket *ssocket = server->ssocket;

	if (ssocket == NULL)
		return -ENOTSOCK; /* BB eventually add reconnect code here */

	smb_msg.msg_name = (struct sockaddr *) &server->dstaddr;
	smb_msg.msg_namelen = sizeof(struct sockaddr);
	smb_msg.msg_control = NULL;
	smb_msg.msg_controllen = 0;
	if (server->noblocksnd)
		smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
	else
		smb_msg.msg_flags = MSG_NOSIGNAL;

	total_len = 0;
	for (i = 0; i < n_vec; i++)
		total_len += iov[i].iov_len;

	cFYI(1, "Sending smb:  total_len %d", total_len);
	dump_smb(smb_buffer, len);

	i = 0;
	while (total_len) {
		rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
				    n_vec - first_vec, total_len);
		if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
			i++;
			/* if blocking send we try 3 times, since each can block
			   for 5 seconds. For nonblocking  we have to try more
			   but wait increasing amounts of time allowing time for
			   socket to clear.  The overall time we wait in either
			   case to send on the socket is about 15 seconds.
			   Similarly we wait for 15 seconds for
			   a response from the server in SendReceive[2]
			   for the server to send a response back for
			   most types of requests (except SMB Write
			   past end of file which can be slow, and
			   blocking lock operations). NFS waits slightly longer
			   than CIFS, but this can make it take longer for
			   nonresponsive servers to be detected and 15 seconds
			   is more than enough time for modern networks to
			   send a packet.  In most cases if we fail to send
			   after the retries we will kill the socket and
			   reconnect which may clear the network problem.
			*/
			if ((i >= 14) || (!server->noblocksnd && (i > 2))) {
				cERROR(1, "sends on sock %p stuck for 15 seconds",
				    ssocket);
				rc = -EAGAIN;
				break;
			}
			msleep(1 << i);
			continue;
		}
		if (rc < 0)
			break;

		if (rc == total_len) {
			total_len = 0;
			break;
		} else if (rc > total_len) {
			cERROR(1, "sent %d requested %d", rc, total_len);
			break;
		}
		if (rc == 0) {
			/* should never happen, letting socket clear before
			   retrying is our only obvious option here */
			cERROR(1, "tcp sent no data");
			msleep(500);
			continue;
		}
		total_len -= rc;
		/* the line below resets i */
		for (i = first_vec; i < n_vec; i++) {
			if (iov[i].iov_len) {
				if (rc > iov[i].iov_len) {
					rc -= iov[i].iov_len;
					iov[i].iov_len = 0;
				} else {
					iov[i].iov_base += rc;
					iov[i].iov_len -= rc;
					first_vec = i;
					break;
				}
			}
		}
		i = 0; /* in case we get ENOSPC on the next send */
	}

//.........这里部分代码省略.........