include/linux/smb_fs.h

   1 /*
   2  *  smb_fs.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 _LINUX_SMB_FS_H
  10 #define _LINUX_SMB_FS_H
  11
  12 #include <linux/smb.h>
  13
  14 /*
  15  * ioctl commands
  16  */
  17 #define SMB_IOC_GETMOUNTUID             _IOR('u', 1, __kernel_old_uid_t)
  18 #define SMB_IOC_NEWCONN                 _IOW('u', 2, struct smb_conn_opt)
  19
  20 /* __kernel_uid_t can never change, so we have to use __kernel_uid32_t */
  21 #define SMB_IOC_GETMOUNTUID32           _IOR('u', 3, __kernel_uid32_t)
  22
  23
  24 #ifdef __KERNEL__
  25 #include <linux/smb_fs_i.h>
  26 #include <linux/smb_fs_sb.h>
  27
  28 #include <linux/fs.h>
  29 #include <linux/pagemap.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/smb_mount.h>
  32 #include <linux/jiffies.h>
  33 #include <asm/unaligned.h>
  34
  35 static inline struct smb_sb_info *SMB_SB(struct super_block *sb)
  36 {
  37         return sb->s_fs_info;
  38 }
  39
  40 static inline struct smb_inode_info *SMB_I(struct inode *inode)
  41 {
  42         return container_of(inode, struct smb_inode_info, vfs_inode);
  43 }
  44
  45 /* macro names are short for word, double-word, long value (?) */
  46 #define WVAL(buf, pos) (get_unaligned_le16((u8 *)(buf) + (pos)))
  47 #define DVAL(buf, pos) (get_unaligned_le32((u8 *)(buf) + (pos)))
  48 #define LVAL(buf, pos) (get_unaligned_le64((u8 *)(buf) + (pos)))
  49
  50 #define WSET(buf, pos, val) put_unaligned_le16((val), (u8 *)(buf) + (pos))
  51 #define DSET(buf, pos, val) put_unaligned_le32((val), (u8 *)(buf) + (pos))
  52 #define LSET(buf, pos, val) put_unaligned_le64((val), (u8 *)(buf) + (pos))
  53
  54 /* where to find the base of the SMB packet proper */
  55 #define smb_base(buf) ((u8 *)(((u8 *)(buf))+4))
  56
  57 /*
  58  * Flags for the in-memory inode
  59  */
  60 #define SMB_F_LOCALWRITE        0x02    /* file modified locally */
  61
  62
  63 /* NT1 protocol capability bits */
  64 #define SMB_CAP_RAW_MODE         0x00000001
  65 #define SMB_CAP_MPX_MODE         0x00000002
  66 #define SMB_CAP_UNICODE          0x00000004
  67 #define SMB_CAP_LARGE_FILES      0x00000008
  68 #define SMB_CAP_NT_SMBS          0x00000010
  69 #define SMB_CAP_RPC_REMOTE_APIS  0x00000020
  70 #define SMB_CAP_STATUS32         0x00000040
  71 #define SMB_CAP_LEVEL_II_OPLOCKS 0x00000080
  72 #define SMB_CAP_LOCK_AND_READ    0x00000100
  73 #define SMB_CAP_NT_FIND          0x00000200
  74 #define SMB_CAP_DFS              0x00001000
  75 #define SMB_CAP_LARGE_READX      0x00004000
  76 #define SMB_CAP_LARGE_WRITEX     0x00008000
  77 #define SMB_CAP_UNIX             0x00800000     /* unofficial ... */
  78
  79
  80 /*
  81  * This is the time we allow an inode, dentry or dir cache to live. It is bad
  82  * for performance to have shorter ttl on an inode than on the cache. It can
  83  * cause refresh on each inode for a dir listing ... one-by-one
  84  */
  85 #define SMB_MAX_AGE(server) (((server)->mnt->ttl * HZ) / 1000)
  86
  87 static inline void
  88 smb_age_dentry(struct smb_sb_info *server, struct dentry *dentry)
  89 {
  90         dentry->d_time = jiffies - SMB_MAX_AGE(server);
  91 }
  92
  93 struct smb_cache_head {
  94         time_t          mtime;  /* unused */
  95         unsigned long   time;   /* cache age */
  96         unsigned long   end;    /* last valid fpos in cache */
  97         int             eof;
  98 };
  99
 100 #define SMB_DIRCACHE_SIZE       ((int)(PAGE_CACHE_SIZE/sizeof(struct dentry *)))
 101 union smb_dir_cache {
 102         struct smb_cache_head   head;
 103         struct dentry           *dentry[SMB_DIRCACHE_SIZE];
 104 };
 105
 106 #define SMB_FIRSTCACHE_SIZE     ((int)((SMB_DIRCACHE_SIZE * \
 107         sizeof(struct dentry *) - sizeof(struct smb_cache_head)) / \
 108         sizeof(struct dentry *)))
 109
 110 #define SMB_DIRCACHE_START      (SMB_DIRCACHE_SIZE - SMB_FIRSTCACHE_SIZE)
 111
 112 struct smb_cache_control {
 113         struct  smb_cache_head          head;
 114         struct  page                    *page;
 115         union   smb_dir_cache           *cache;
 116         unsigned long                   fpos, ofs;
 117         int                             filled, valid, idx;
 118 };
 119
 120 #define SMB_OPS_NUM_STATIC      5
 121 struct smb_ops {
 122         int (*read)(struct inode *inode, loff_t offset, int count,
 123                     char *data);
 124         int (*write)(struct inode *inode, loff_t offset, int count, const
 125                      char *data);
 126         int (*readdir)(struct file *filp, void *dirent, filldir_t filldir,
 127                        struct smb_cache_control *ctl);
 128
 129         int (*getattr)(struct smb_sb_info *server, struct dentry *dir,
 130                        struct smb_fattr *fattr);
 131         /* int (*setattr)(...); */      /* setattr is really icky! */
 132
 133         int (*truncate)(struct inode *inode, loff_t length);
 134
 135
 136         /* --- --- --- end of "static" entries --- --- --- */
 137
 138         int (*convert)(unsigned char *output, int olen,
 139                        const unsigned char *input, int ilen,
 140                        struct nls_table *nls_from,
 141                        struct nls_table *nls_to);
 142 };
 143
 144 static inline int
 145 smb_is_open(struct inode *i)
 146 {
 147         return (SMB_I(i)->open == server_from_inode(i)->generation);
 148 }
 149
 150 extern void smb_install_null_ops(struct smb_ops *);
 151 #endif /* __KERNEL__ */
 152
 153 #endif /* _LINUX_SMB_FS_H */