fs/pohmelfs/pohmelfs.h

   1 /*
   2  * Copyright (C) 2011+ Evgeniy Polyakov <zbr@ioremap.net>
   3  */
   4
   5 #ifndef __POHMELFS_H
   6 #define __POHMELFS_H
   7
   8 #include <linux/backing-dev.h>
   9 #include <linux/crypto.h>
  10 #include <linux/fs.h>
  11 #include <linux/kref.h>
  12 #include <linux/list.h>
  13 #include <linux/mutex.h>
  14 #include <linux/net.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/printk.h>
  17 #include <linux/slab.h>
  18 #include <linux/wait.h>
  19 #include <linux/workqueue.h>
  20
  21 #include <crypto/sha.h>
  22
  23 #define dnet_bswap16(x)         cpu_to_le16(x)
  24 #define dnet_bswap32(x)         cpu_to_le32(x)
  25 #define dnet_bswap64(x)         cpu_to_le64(x)
  26
  27 /* theese are needed for packet.h below to compile */
  28 #define DNET_ID_SIZE    SHA512_DIGEST_SIZE
  29 #define DNET_CSUM_SIZE  SHA512_DIGEST_SIZE
  30
  31 /*
  32  * is not used in kernel, but we want to share the same header
  33  * with userspace, so I put it here for compiler to shut up
  34  */
  35 int gettimeofday(struct timeval *, struct timezone *);
  36
  37 #include "packet.h"
  38
  39 static inline struct timespec pohmelfs_date(struct dnet_time *tm)
  40 {
  41         struct timespec ts;
  42
  43         ts.tv_sec = tm->tsec;
  44         ts.tv_nsec = tm->tnsec;
  45
  46         return ts;
  47 }
  48
  49 struct pohmelfs_cmd {
  50         struct dnet_cmd         cmd;
  51         struct dnet_attr        attr;
  52         union {
  53                 struct dnet_io_attr     io;
  54         } p;
  55 };
  56
  57 /*
  58  * Compare two IDs.
  59  * Returns  1 when id1 > id2
  60  *         -1 when id1 < id2
  61  *          0 when id1 = id2
  62  */
  63 static inline int dnet_id_cmp_str(const unsigned char *id1, const unsigned char *id2)
  64 {
  65         unsigned int i = 0;
  66
  67         for (i*=sizeof(unsigned long); i<DNET_ID_SIZE; ++i) {
  68                 if (id1[i] < id2[i])
  69                         return -1;
  70                 if (id1[i] > id2[i])
  71                         return 1;
  72         }
  73
  74         return 0;
  75 }
  76
  77 struct pohmelfs_state;
  78 struct pohmelfs_sb;
  79 struct pohmelfs_trans;
  80
  81 struct pohmelfs_trans_cb {
  82         int                             (* init)(struct pohmelfs_trans *t);
  83         int                             (* complete)(struct pohmelfs_trans *t, struct pohmelfs_state *recv);
  84         int                             (* recv_reply)(struct pohmelfs_trans *t, struct pohmelfs_state *recv);
  85         void                            (* destroy)(struct pohmelfs_trans *t);
  86 };
  87
  88 struct pohmelfs_trans {
  89         struct list_head        trans_entry;
  90
  91         struct kref             refcnt;
  92
  93         unsigned long           trans;
  94
  95         struct inode            *inode;
  96
  97         struct pohmelfs_state   *st;
  98
  99         struct pohmelfs_cmd     cmd;
 100
 101         u64                     header_size, data_size;
 102
 103         void                    *data;
 104
 105         struct address_space    *mapping;
 106
 107         unsigned long long      recv_offset;
 108         void                    *recv_data;
 109
 110         void                    *priv;
 111
 112         struct pohmelfs_trans_cb        cb;
 113 };
 114
 115 struct pohmelfs_trans *pohmelfs_trans_alloc(struct inode *inode);
 116 struct pohmelfs_trans *pohmelfs_trans_alloc_io_buf(struct inode *inode, int group, int command,
 117                 void *data, u64 offset, u64 size, int aflags, int ioflags, int type);
 118 void pohmelfs_trans_put(struct pohmelfs_trans *t);
 119
 120 int pohmelfs_trans_insert(struct pohmelfs_trans *t);
 121 struct pohmelfs_trans *pohmelfs_trans_lookup(struct pohmelfs_state *st, struct dnet_cmd *cmd);
 122
 123 struct pohmelfs_state {
 124         struct pohmelfs_sb      *psb;
 125         struct list_head        state_entry;
 126
 127         struct sockaddr_storage sa;
 128         int                     addrlen;
 129         struct socket           *sock;
 130
 131         int                     group_id;
 132
 133         struct mutex            trans_lock;
 134         struct list_head        trans_list;
 135         struct list_head        sent_trans_list;
 136
 137         struct kref             refcnt;
 138
 139         int                     routes;
 140
 141         /* Waiting/polling machinery */
 142         wait_queue_t            wait;
 143         wait_queue_head_t       *whead;
 144
 145         struct work_struct      send_work;
 146         struct work_struct      recv_work;
 147
 148         /* is set when dnet_cmd is being read, otherwise attached data */
 149         int                     cmd_read;
 150         /* currently read command reply */
 151         struct dnet_cmd         cmd;
 152 };
 153
 154 struct pohmelfs_state *pohmelfs_state_create(struct pohmelfs_sb *psb, struct sockaddr_storage *sa, int addrlen,
 155                 int ask_route, int group_id);
 156 struct pohmelfs_state *pohmelfs_state_lookup(struct pohmelfs_sb *psb, struct dnet_raw_id *id, int group);
 157
 158 static inline void pohmelfs_state_get(struct pohmelfs_state *st)
 159 {
 160         kref_get(&st->refcnt);
 161 }
 162
 163 void pohmelfs_state_put(struct pohmelfs_state *st);
 164 void pohmelfs_state_kill(struct pohmelfs_state *st);
 165
 166 struct pohmelfs_state *pohmelfs_addr_exist(struct pohmelfs_sb *psb, struct sockaddr_storage *sa, int addrlen);
 167
 168 void pohmelfs_state_schedule(struct pohmelfs_state *st);
 169
 170 __attribute__ ((format (printf, 2, 3))) void pohmelfs_print_addr(struct sockaddr_storage *addr, const char *fmt, ...);
 171
 172 #define POHMELFS_INODE_INFO_REMOVED             (1<<0)
 173
 174 struct pohmelfs_inode_info {
 175         struct dnet_raw_id      id;
 176
 177         unsigned int            mode;
 178         unsigned int            nlink;
 179         unsigned int            uid;
 180         unsigned int            gid;
 181         unsigned int            blocksize;
 182         unsigned int            namelen;
 183         __u64                   ino;
 184         __u64                   blocks;
 185         __u64                   rdev;
 186         __u64                   size;
 187         __u64                   version;
 188
 189         __u64                   flags;
 190
 191         struct dnet_time        ctime;
 192         struct dnet_time        mtime;
 193         struct dnet_time        atime;
 194 } __attribute__ ((packed));
 195
 196 void pohmelfs_fill_inode_info(struct inode *inode, struct pohmelfs_inode_info *info);
 197 void pohmelfs_fill_inode(struct inode *inode, struct pohmelfs_inode_info *info);
 198 void pohmelfs_convert_inode_info(struct pohmelfs_inode_info *info);
 199 void pohmelfs_inode_info_current(struct pohmelfs_sb *psb, struct pohmelfs_inode_info *info);
 200
 201 struct pohmelfs_inode {
 202         struct inode            vfs_inode;
 203         struct dnet_raw_id      id;
 204         struct dnet_raw_id      parent_id;
 205
 206         struct rb_node          node;
 207
 208         unsigned long long      offset;
 209         unsigned long long      isize;
 210 };
 211
 212 int pohmelfs_send_inode_info(struct pohmelfs_inode *pi, struct dnet_raw_id *id, const char *sname, int len);
 213 struct pohmelfs_inode *pohmelfs_sb_inode_lookup(struct pohmelfs_sb *psb, struct dnet_raw_id *id);
 214
 215 struct pohmelfs_sb {
 216         struct super_block      *sb;
 217         struct backing_dev_info bdi;
 218
 219         struct pohmelfs_inode   *root;
 220
 221         spinlock_t              inode_lock;
 222         struct rb_root          inode_root;
 223
 224         int                     sync;
 225         int                     use_http_compat;
 226
 227         int                     bdi_num;
 228
 229         struct rb_root          route_root;
 230         struct list_head        state_list;
 231         spinlock_t              state_lock;
 232
 233         long                    read_wait_timeout;
 234         long                    write_wait_timeout;
 235
 236         char                    *fsid;
 237         int                     fsid_len;
 238
 239         atomic_long_t           ino;
 240         atomic_long_t           trans;
 241
 242         struct crypto_hash      *hash;
 243
 244         struct workqueue_struct *wq;
 245
 246         int                     *groups;
 247         int                     group_num;
 248 };
 249
 250 static inline struct pohmelfs_sb *pohmelfs_sb(struct super_block *sb)
 251 {
 252         return (struct pohmelfs_sb *)sb->s_fs_info;
 253 }
 254
 255 static inline struct pohmelfs_inode *pohmelfs_inode(struct inode *inode)
 256 {
 257         return container_of(inode, struct pohmelfs_inode, vfs_inode);
 258 }
 259
 260 extern struct kmem_cache *pohmelfs_inode_cache;
 261 extern struct kmem_cache *pohmelfs_trans_cache;
 262 extern struct kmem_cache *pohmelfs_inode_info_cache;
 263 extern struct kmem_cache *pohmelfs_route_cache;
 264 extern struct kmem_cache *pohmelfs_wait_cache;
 265 extern struct kmem_cache *pohmelfs_io_cache;
 266
 267 struct inode *pohmelfs_alloc_inode(struct super_block *sb);
 268 void pohmelfs_destroy_inode(struct inode *);
 269
 270 struct pohmelfs_inode *pohmelfs_existing_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode_info *info);
 271 struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb, int mode);
 272 int pohmelfs_hash(struct pohmelfs_sb *psb, const void *data, const size_t size, struct dnet_raw_id *id);
 273
 274 char *pohmelfs_dump_id(const unsigned char *id);
 275
 276 extern const struct file_operations pohmelfs_dir_fops;
 277 extern const struct inode_operations pohmelfs_dir_inode_operations;
 278
 279 extern const struct file_operations pohmelfs_file_ops;
 280 extern const struct inode_operations pohmelfs_file_inode_operations;
 281
 282 extern void *pohmelfs_scratch_buf;
 283 extern int pohmelfs_scratch_buf_size;
 284
 285 /*
 286  * if this flag is set, pohmelfs_inode_info->data is owned by the caller,
 287  * so sending path may use it on its own and free (using kfree) when it's done
 288  *
 289  * This logic does not work for shared buffers or
 290  * when multiple transactions will be sent for single pohmelfs_inode_info
 291  */
 292 #define POHMELFS_IO_OWN                 (1<<0)
 293
 294 struct pohmelfs_io {
 295         struct pohmelfs_inode           *pi;
 296
 297         struct dnet_raw_id              *id;
 298
 299         int                             cmd;
 300         int                             type;
 301
 302         u64                             offset, size;
 303         u64                             start, num;
 304
 305         u32                             cflags;
 306         u32                             aflags;
 307         u32                             ioflags;
 308
 309         int                             group_id;
 310
 311         u32                             alloc_flags;
 312         void                            *data;
 313
 314         struct address_space            *mapping;
 315
 316         void                            *priv;
 317
 318         struct pohmelfs_trans_cb        cb;
 319 };
 320
 321 int pohmelfs_send_io_group(struct pohmelfs_io *pio, int group_id);
 322 int pohmelfs_send_io(struct pohmelfs_io *pio);
 323 int pohmelfs_send_buf_single(struct pohmelfs_io *pio, struct pohmelfs_state *st);
 324 int pohmelfs_send_buf(struct pohmelfs_io *pio);
 325
 326 int pohmelfs_data_recv(struct pohmelfs_state *st, void *buf, u64 size, unsigned int flags);
 327 int pohmelfs_recv(struct pohmelfs_trans *t, struct pohmelfs_state *recv, void *data, int size);
 328
 329 struct pohmelfs_route {
 330         struct rb_node                  node;
 331         int                             group_id;
 332         struct dnet_raw_id              id;
 333         struct pohmelfs_state           *st;
 334 };
 335
 336 int pohmelfs_route_request(struct pohmelfs_state *st);
 337 void pohmelfs_route_remove_all(struct pohmelfs_state *st);
 338
 339 struct pohmelfs_wait {
 340         wait_queue_head_t       wq;
 341         struct pohmelfs_inode   *pi;
 342         void                    *ret;
 343         int                     condition;
 344         struct kref             refcnt;
 345 };
 346
 347 struct pohmelfs_wait *pohmelfs_wait_alloc(struct pohmelfs_inode *pi);
 348 void pohmelfs_wait_put(struct pohmelfs_wait *wait);
 349 static inline void pohmelfs_wait_get(struct pohmelfs_wait *wait)
 350 {
 351         kref_get(&wait->refcnt);
 352 }
 353
 354 #endif /* __POHMELFS_H */