include/linux/fsfilter.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  */
   4
   5 #ifndef __FILTER_H_
   6 #define __FILTER_H_ 1
   7
   8 #ifdef __KERNEL__
   9
  10 /* cachetype.c */
  11
  12 /*
  13  * it is important that things like inode, super and file operations
  14  * for intermezzo are not defined statically.  If methods are NULL
  15  * the VFS takes special action based on that.  Given that different
  16  * cache types have NULL ops at different slots, we must install opeation
  17  * talbes for InterMezzo with NULL's in the same spot
  18  */
  19
  20 struct filter_ops {
  21         struct super_operations filter_sops;
  22
  23         struct inode_operations filter_dir_iops;
  24         struct inode_operations filter_file_iops;
  25         struct inode_operations filter_sym_iops;
  26
  27         struct file_operations filter_dir_fops;
  28         struct file_operations filter_file_fops;
  29         struct file_operations filter_sym_fops;
  30
  31         struct dentry_operations filter_dentry_ops;
  32 };
  33
  34 struct cache_ops {
  35         /* operations on the file store */
  36         struct super_operations *cache_sops;
  37
  38         struct inode_operations *cache_dir_iops;
  39         struct inode_operations *cache_file_iops;
  40         struct inode_operations *cache_sym_iops;
  41
  42         struct file_operations *cache_dir_fops;
  43         struct file_operations *cache_file_fops;
  44         struct file_operations *cache_sym_fops;
  45
  46         struct dentry_operations *cache_dentry_ops;
  47 };
  48
  49
  50 #define FILTER_DID_SUPER_OPS 0x1
  51 #define FILTER_DID_INODE_OPS 0x2
  52 #define FILTER_DID_FILE_OPS 0x4
  53 #define FILTER_DID_DENTRY_OPS 0x8
  54 #define FILTER_DID_DEV_OPS 0x10
  55 #define FILTER_DID_SYMLINK_OPS 0x20
  56 #define FILTER_DID_DIR_OPS 0x40
  57
  58 struct filter_fs {
  59         int o_flags;
  60         struct filter_ops o_fops;
  61         struct cache_ops  o_caops;
  62         struct journal_ops *o_trops;
  63         struct snapshot_ops *o_snops;
  64 };
  65
  66 #define FILTER_FS_TYPES 6
  67 #define FILTER_FS_EXT2 0
  68 #define FILTER_FS_EXT3 1
  69 #define FILTER_FS_REISERFS 2
  70 #define FILTER_FS_XFS 3
  71 #define FILTER_FS_OBDFS 4
  72 #define FILTER_FS_TMPFS 5
  73 extern struct filter_fs filter_oppar[FILTER_FS_TYPES];
  74
  75 struct filter_fs *filter_get_filter_fs(const char *cache_type);
  76 void filter_setup_journal_ops(struct filter_fs *ops, char *cache_type);
  77 struct super_operations *filter_c2usops(struct filter_fs *cache);
  78 struct inode_operations *filter_c2ufiops(struct filter_fs *cache);
  79 struct inode_operations *filter_c2udiops(struct filter_fs *cache);
  80 struct inode_operations *filter_c2usiops(struct filter_fs *cache);
  81 struct file_operations *filter_c2uffops(struct filter_fs *cache);
  82 struct file_operations *filter_c2udfops(struct filter_fs *cache);
  83 struct file_operations *filter_c2usfops(struct filter_fs *cache);
  84 struct super_operations *filter_c2csops(struct filter_fs *cache);
  85 struct inode_operations *filter_c2cfiops(struct filter_fs *cache);
  86 struct inode_operations *filter_c2cdiops(struct filter_fs *cache);
  87 struct inode_operations *filter_c2csiops(struct filter_fs *cache);
  88 struct file_operations *filter_c2cffops(struct filter_fs *cache);
  89 struct file_operations *filter_c2cdfops(struct filter_fs *cache);
  90 struct file_operations *filter_c2csfops(struct filter_fs *cache);
  91 struct dentry_operations *filter_c2cdops(struct filter_fs *cache);
  92 struct dentry_operations *filter_c2udops(struct filter_fs *cache);
  93
  94 void filter_setup_super_ops(struct filter_fs *cache, struct super_operations *cache_ops, struct super_operations *filter_sops);
  95 void filter_setup_dir_ops(struct filter_fs *cache, struct inode *cache_inode, struct inode_operations *filter_iops, struct file_operations *ffops);
  96 void filter_setup_file_ops(struct filter_fs *cache, struct inode *cache_inode, struct inode_operations *filter_iops, struct file_operations *filter_op);
  97 void filter_setup_symlink_ops(struct filter_fs *cache, struct inode *cache_inode, struct inode_operations *filter_iops, struct file_operations *filter_op);
  98 void filter_setup_dentry_ops(struct filter_fs *cache, struct dentry_operations *cache_dop,  struct dentry_operations *filter_dop);
  99
 100
 101 #define PRESTO_DEBUG
 102 #ifdef PRESTO_DEBUG
 103 /* debugging masks */
 104 #define D_SUPER     1
 105 #define D_INODE     2   /* print entry and exit into procedure */
 106 #define D_FILE      4
 107 #define D_CACHE     8   /* cache debugging */
 108 #define D_MALLOC    16  /* print malloc, de-alloc information */
 109 #define D_JOURNAL   32
 110 #define D_UPCALL    64  /* up and downcall debugging */
 111 #define D_PSDEV    128
 112 #define D_PIOCTL   256
 113 #define D_SPECIAL  512
 114 #define D_TIMING  1024
 115 #define D_DOWNCALL 2048
 116
 117 #define FDEBUG(mask, format, a...)                                      \
 118         do {                                                            \
 119                 if (filter_debug & mask) {                              \
 120                         printk("(%s,l. %d): ", __FUNCTION__, __LINE__); \
 121                         printk(format, ##a); }                          \
 122         } while (0)
 123
 124 #define FENTRY                                                          \
 125         if(filter_print_entry)                                          \
 126                 printk("Process %d entered %s\n", current->pid, __FUNCTION__)
 127
 128 #define FEXIT                                                           \
 129         if(filter_print_entry)                                          \
 130                 printk("Process %d leaving %s at %d\n", current->pid,   \
 131                        __FUNCTION__,__LINE__)
 132 #endif
 133 #endif
 134 #endif