include/linux/smb_fs_sb.h

   1 /*
   2  *  smb_fs_sb.h
   3  *
   4  *  Copyright (C) 1995 by Paal-Kr. Engstad and Volker Lendecke
   5  *  Copyright (C) 1997 by Volker Lendecke
   6  *
   7  */
   8
   9 #ifndef _SMB_FS_SB
  10 #define _SMB_FS_SB
  11
  12 #include <linux/types.h>
  13 #include <linux/backing-dev.h>
  14 #include <linux/smb.h>
  15
  16 /*
  17  * Upper limit on the total number of active smb_request structs.
  18  */
  19 #define MAX_REQUEST_HARD       256
  20
  21 enum smb_receive_state {
  22         SMB_RECV_START,         /* No data read, looking for length + sig */
  23         SMB_RECV_HEADER,        /* Reading the header data */
  24         SMB_RECV_HCOMPLETE,     /* Done with the header */
  25         SMB_RECV_PARAM,         /* Reading parameter words */
  26         SMB_RECV_DATA,          /* Reading data bytes */
  27         SMB_RECV_END,           /* End of request */
  28         SMB_RECV_DROP,          /* Dropping this SMB */
  29         SMB_RECV_REQUEST,       /* Received a request and not a reply */
  30 };
  31
  32 /* structure access macros */
  33 #define server_from_inode(inode) SMB_SB((inode)->i_sb)
  34 #define server_from_dentry(dentry) SMB_SB((dentry)->d_sb)
  35 #define SB_of(server) ((server)->super_block)
  36
  37 struct smb_sb_info {
  38         /* List of all smbfs superblocks */
  39         struct list_head entry;
  40
  41         enum smb_conn_state state;
  42         struct file * sock_file;
  43         int conn_error;
  44         enum smb_receive_state rstate;
  45
  46         atomic_t nr_requests;
  47         struct list_head xmitq;
  48         struct list_head recvq;
  49         u16 mid;
  50
  51         struct smb_mount_data_kernel *mnt;
  52
  53         /* Connections are counted. Each time a new socket arrives,
  54          * generation is incremented.
  55          */
  56         unsigned int generation;
  57         struct pid *conn_pid;
  58         struct smb_conn_opt opt;
  59         wait_queue_head_t conn_wq;
  60         int conn_complete;
  61         struct semaphore sem;
  62
  63         unsigned char      header[SMB_HEADER_LEN + 20*2 + 2];
  64         u32                header_len;
  65         u32                smb_len;
  66         u32                smb_read;
  67
  68         /* We use our own data_ready callback, but need the original one */
  69         void *data_ready;
  70
  71         /* nls pointers for codepage conversions */
  72         struct nls_table *remote_nls;
  73         struct nls_table *local_nls;
  74
  75         struct smb_ops *ops;
  76
  77         struct super_block *super_block;
  78
  79         struct backing_dev_info bdi;
  80 };
  81
  82 static inline int
  83 smb_lock_server_interruptible(struct smb_sb_info *server)
  84 {
  85         return down_interruptible(&(server->sem));
  86 }
  87
  88 static inline void
  89 smb_lock_server(struct smb_sb_info *server)
  90 {
  91         down(&(server->sem));
  92 }
  93
  94 static inline void
  95 smb_unlock_server(struct smb_sb_info *server)
  96 {
  97         up(&(server->sem));
  98 }
  99
 100 #endif