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
 200 struct pohmelfs_inode {
 201         struct inode            vfs_inode;
 202         struct dnet_raw_id      id;
 203         struct dnet_raw_id      parent_id;
 204
 205         size_t                  prepared_size;
 206         int                     received;
 207
 208         struct rb_node          node;
 209 };
 210
 211 int pohmelfs_send_inode_info(struct pohmelfs_inode *pi, struct dnet_raw_id *id, const char *sname, int len, int sync);
 212 struct pohmelfs_inode *pohmelfs_sb_inode_lookup(struct pohmelfs_sb *psb, struct dnet_raw_id *id);
 213
 214
 215 struct pohmelfs_reconnect {
 216         struct list_head        reconnect_entry;
 217         struct sockaddr_storage sa;
 218         int                     addrlen;
 219         int                     group_id;
 220 };
 221
 222 int pohmelfs_state_add_reconnect(struct pohmelfs_state *st);
 223
 224
 225 struct pohmelfs_sb {
 226         struct super_block      *sb;
 227         struct backing_dev_info bdi;
 228
 229         struct pohmelfs_inode   *root;
 230
 231         spinlock_t              inode_lock;
 232         struct rb_root          inode_root;
 233
 234         int                     sync;
 235         int                     use_http_compat;
 236
 237         int                     bdi_num;
 238
 239         struct rb_root          route_root;
 240         struct list_head        state_list;
 241         spinlock_t              state_lock;
 242
 243         long                    read_wait_timeout;
 244         long                    write_wait_timeout;
 245         long                    sync_timeout;
 246
 247         char                    *fsid;
 248         int                     fsid_len;
 249
 250         int                     no_read_csum;
 251
 252         atomic_long_t           ino;
 253         atomic_long_t           trans;
 254
 255         struct crypto_hash      *hash;
 256
 257         struct workqueue_struct *wq;
 258
 259         int                     *groups;
 260         int                     group_num;
 261
 262         struct mutex            reconnect_lock;
 263         struct list_head        reconnect_list;
 264         struct list_head        kill_state_list;
 265         struct delayed_work     reconnect_work;
 266         long                    reconnect_timeout;
 267 };
 268
 269 static inline struct pohmelfs_sb *pohmelfs_sb(struct super_block *sb)
 270 {
 271         return (struct pohmelfs_sb *)sb->s_fs_info;
 272 }
 273
 274 static inline struct pohmelfs_inode *pohmelfs_inode(struct inode *inode)
 275 {
 276         return container_of(inode, struct pohmelfs_inode, vfs_inode);
 277 }
 278
 279 struct pohmelfs_inode_info_binary_package {
 280         struct dnet_raw_id              parent;
 281         struct pohmelfs_inode_info      info;
 282 };
 283
 284 extern struct kmem_cache *pohmelfs_inode_cache;
 285 extern struct kmem_cache *pohmelfs_trans_cache;
 286 extern struct kmem_cache *pohmelfs_inode_info_cache;
 287 extern struct kmem_cache *pohmelfs_route_cache;
 288 extern struct kmem_cache *pohmelfs_wait_cache;
 289 extern struct kmem_cache *pohmelfs_io_cache;
 290 extern struct kmem_cache *pohmelfs_inode_info_binary_package_cache;
 291
 292 struct inode *pohmelfs_alloc_inode(struct super_block *sb);
 293 void pohmelfs_destroy_inode(struct inode *);
 294
 295 struct pohmelfs_inode *pohmelfs_existing_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode_info *info);
 296 struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb, int mode);
 297 int pohmelfs_hash(struct pohmelfs_sb *psb, const void *data, const size_t size, struct dnet_raw_id *id);
 298
 299 char *pohmelfs_dump_id(const unsigned char *id);
 300 char *pohmelfs_dump_id_len_raw(const unsigned char *id, unsigned int len, char *dst);
 301
 302 int pohmelfs_setattr(struct dentry *dentry, struct iattr *iattr);
 303
 304 int pohmelfs_write_command(struct pohmelfs_inode *pi, loff_t offset, size_t len);
 305 int pohmelfs_metadata_inode(struct pohmelfs_inode *pi, int sync);
 306
 307 extern const struct file_operations pohmelfs_dir_fops;
 308 extern const struct inode_operations pohmelfs_dir_inode_operations;
 309
 310 extern const struct file_operations pohmelfs_file_ops;
 311 extern const struct inode_operations pohmelfs_file_inode_operations;
 312
 313 extern const struct inode_operations pohmelfs_symlink_inode_operations;
 314
 315 extern void *pohmelfs_scratch_buf;
 316 extern int pohmelfs_scratch_buf_size;
 317
 318 /*
 319  * if this flag is set, pohmelfs_inode_info->data is owned by the caller,
 320  * so sending path may use it on its own and free (using kfree) when it's done
 321  *
 322  * This logic does not work for shared buffers or
 323  * when multiple transactions will be sent for single pohmelfs_inode_info
 324  */
 325 #define POHMELFS_IO_OWN                 (1<<0)
 326
 327 struct pohmelfs_io {
 328         struct pohmelfs_inode           *pi;
 329
 330         struct dnet_raw_id              *id;
 331
 332         int                             cmd;
 333         int                             type;
 334
 335         u64                             offset, size;
 336         u64                             start, num;
 337
 338         u32                             cflags;
 339         u32                             aflags;
 340         u32                             ioflags;
 341
 342         int                             group_id;
 343
 344         u32                             alloc_flags;
 345         void                            *data;
 346
 347         struct address_space            *mapping;
 348
 349         void                            *priv;
 350
 351         struct pohmelfs_trans_cb        cb;
 352 };
 353
 354 int pohmelfs_send_io_group(struct pohmelfs_io *pio, int group_id);
 355 int pohmelfs_send_io(struct pohmelfs_io *pio);
 356 int pohmelfs_send_buf_single(struct pohmelfs_io *pio, struct pohmelfs_state *st);
 357 int pohmelfs_send_buf(struct pohmelfs_io *pio);
 358
 359 int pohmelfs_data_recv(struct pohmelfs_state *st, void *buf, u64 size, unsigned int flags);
 360 int pohmelfs_recv(struct pohmelfs_trans *t, struct pohmelfs_state *recv, void *data, int size);
 361
 362 struct pohmelfs_route {
 363         struct rb_node                  node;
 364         int                             group_id;
 365         struct dnet_raw_id              id;
 366         struct pohmelfs_state           *st;
 367 };
 368
 369 int pohmelfs_route_request(struct pohmelfs_state *st);
 370 void pohmelfs_route_remove_all(struct pohmelfs_state *st);
 371
 372 struct pohmelfs_wait {
 373         wait_queue_head_t       wq;
 374         struct pohmelfs_inode   *pi;
 375         void                    *ret;
 376         atomic_long_t           count;
 377         int                     condition;
 378         struct kref             refcnt;
 379 };
 380
 381 struct pohmelfs_wait *pohmelfs_wait_alloc(struct pohmelfs_inode *pi);
 382 void pohmelfs_wait_put(struct pohmelfs_wait *wait);
 383 static inline void pohmelfs_wait_get(struct pohmelfs_wait *wait)
 384 {
 385         kref_get(&wait->refcnt);
 386 }
 387
 388 #endif /* __POHMELFS_H */