fs/ceph/super.h

   1 #ifndef _FS_CEPH_SUPER_H
   2 #define _FS_CEPH_SUPER_H
   3
   4 #include <linux/ceph/ceph_debug.h>
   5
   6 #include <asm/unaligned.h>
   7 #include <linux/backing-dev.h>
   8 #include <linux/completion.h>
   9 #include <linux/exportfs.h>
  10 #include <linux/fs.h>
  11 #include <linux/mempool.h>
  12 #include <linux/pagemap.h>
  13 #include <linux/wait.h>
  14 #include <linux/writeback.h>
  15 #include <linux/slab.h>
  16 #include <linux/posix_acl.h>
  17
  18 #include <linux/ceph/libceph.h>
  19
  20 #ifdef CONFIG_CEPH_FSCACHE
  21 #include <linux/fscache.h>
  22 #endif
  23
  24 /* f_type in struct statfs */
  25 #define CEPH_SUPER_MAGIC 0x00c36400
  26
  27 /* large granularity for statfs utilization stats to facilitate
  28  * large volume sizes on 32-bit machines. */
  29 #define CEPH_BLOCK_SHIFT   22  /* 4 MB */
  30 #define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
  31
  32 #define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
  33 #define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
  34 #define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */
  35 #define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */
  36 #define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */
  37 #define CEPH_MOUNT_OPT_FSCACHE         (1<<10) /* use fscache */
  38 #define CEPH_MOUNT_OPT_NOPOOLPERM      (1<<11) /* no pool permission check */
  39
  40 #define CEPH_MOUNT_OPT_DEFAULT    CEPH_MOUNT_OPT_DCACHE
  41
  42 #define ceph_set_mount_opt(fsc, opt) \
  43         (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
  44 #define ceph_test_mount_opt(fsc, opt) \
  45         (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
  46
  47 #define CEPH_RSIZE_DEFAULT             0           /* max read size */
  48 #define CEPH_RASIZE_DEFAULT            (8192*1024) /* readahead */
  49 #define CEPH_MAX_READDIR_DEFAULT        1024
  50 #define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
  51 #define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
  52
  53 struct ceph_mount_options {
  54         int flags;
  55         int sb_flags;
  56
  57         int wsize;            /* max write size */
  58         int rsize;            /* max read size */
  59         int rasize;           /* max readahead */
  60         int congestion_kb;    /* max writeback in flight */
  61         int caps_wanted_delay_min, caps_wanted_delay_max;
  62         int cap_release_safety;
  63         int max_readdir;       /* max readdir result (entires) */
  64         int max_readdir_bytes; /* max readdir result (bytes) */
  65
  66         /*
  67          * everything above this point can be memcmp'd; everything below
  68          * is handled in compare_mount_options()
  69          */
  70
  71         char *snapdir_name;   /* default ".snap" */
  72 };
  73
  74 struct ceph_fs_client {
  75         struct super_block *sb;
  76
  77         struct ceph_mount_options *mount_options;
  78         struct ceph_client *client;
  79
  80         unsigned long mount_state;
  81         int min_caps;                  /* min caps i added */
  82
  83         struct ceph_mds_client *mdsc;
  84
  85         /* writeback */
  86         mempool_t *wb_pagevec_pool;
  87         struct workqueue_struct *wb_wq;
  88         struct workqueue_struct *pg_inv_wq;
  89         struct workqueue_struct *trunc_wq;
  90         atomic_long_t writeback_count;
  91
  92         struct backing_dev_info backing_dev_info;
  93
  94 #ifdef CONFIG_DEBUG_FS
  95         struct dentry *debugfs_dentry_lru, *debugfs_caps;
  96         struct dentry *debugfs_congestion_kb;
  97         struct dentry *debugfs_bdi;
  98         struct dentry *debugfs_mdsc, *debugfs_mdsmap;
  99         struct dentry *debugfs_mds_sessions;
 100 #endif
 101
 102 #ifdef CONFIG_CEPH_FSCACHE
 103         struct fscache_cookie *fscache;
 104         struct workqueue_struct *revalidate_wq;
 105 #endif
 106 };
 107
 108
 109 /*
 110  * File i/o capability.  This tracks shared state with the metadata
 111  * server that allows us to cache or writeback attributes or to read
 112  * and write data.  For any given inode, we should have one or more
 113  * capabilities, one issued by each metadata server, and our
 114  * cumulative access is the OR of all issued capabilities.
 115  *
 116  * Each cap is referenced by the inode's i_caps rbtree and by per-mds
 117  * session capability lists.
 118  */
 119 struct ceph_cap {
 120         struct ceph_inode_info *ci;
 121         struct rb_node ci_node;          /* per-ci cap tree */
 122         struct ceph_mds_session *session;
 123         struct list_head session_caps;   /* per-session caplist */
 124         u64 cap_id;       /* unique cap id (mds provided) */
 125         union {
 126                 /* in-use caps */
 127                 struct {
 128                         int issued;       /* latest, from the mds */
 129                         int implemented;  /* implemented superset of
 130                                              issued (for revocation) */
 131                         int mds, mds_wanted;
 132                 };
 133                 /* caps to release */
 134                 struct {
 135                         u64 cap_ino;
 136                         int queue_release;
 137                 };
 138         };
 139         u32 seq, issue_seq, mseq;
 140         u32 cap_gen;      /* active/stale cycle */
 141         unsigned long last_used;
 142         struct list_head caps_item;
 143 };
 144
 145 #define CHECK_CAPS_NODELAY    1  /* do not delay any further */
 146 #define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
 147 #define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
 148
 149 /*
 150  * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
 151  * we first complete any in-process sync writes and writeback any dirty
 152  * data before flushing the snapped state (tracked here) back to the MDS.
 153  */
 154 struct ceph_cap_snap {
 155         atomic_t nref;
 156         struct ceph_inode_info *ci;
 157         struct list_head ci_item, flushing_item;
 158
 159         u64 follows, flush_tid;
 160         int issued, dirty;
 161         struct ceph_snap_context *context;
 162
 163         umode_t mode;
 164         kuid_t uid;
 165         kgid_t gid;
 166
 167         struct ceph_buffer *xattr_blob;
 168         u64 xattr_version;
 169
 170         u64 size;
 171         struct timespec mtime, atime, ctime;
 172         u64 time_warp_seq;
 173         int writing;   /* a sync write is still in progress */
 174         int dirty_pages;     /* dirty pages awaiting writeback */
 175         bool inline_data;
 176         bool need_flush;
 177 };
 178
 179 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
 180 {
 181         if (atomic_dec_and_test(&capsnap->nref)) {
 182                 if (capsnap->xattr_blob)
 183                         ceph_buffer_put(capsnap->xattr_blob);
 184                 kfree(capsnap);
 185         }
 186 }
 187
 188 struct ceph_cap_flush {
 189         u64 tid;
 190         int caps;
 191         struct rb_node g_node; // global
 192         union {
 193                 struct rb_node i_node; // inode
 194                 struct list_head list;
 195         };
 196 };
 197
 198 /*
 199  * The frag tree describes how a directory is fragmented, potentially across
 200  * multiple metadata servers.  It is also used to indicate points where
 201  * metadata authority is delegated, and whether/where metadata is replicated.
 202  *
 203  * A _leaf_ frag will be present in the i_fragtree IFF there is
 204  * delegation info.  That is, if mds >= 0 || ndist > 0.
 205  */
 206 #define CEPH_MAX_DIRFRAG_REP 4
 207
 208 struct ceph_inode_frag {
 209         struct rb_node node;
 210
 211         /* fragtree state */
 212         u32 frag;
 213         int split_by;         /* i.e. 2^(split_by) children */
 214
 215         /* delegation and replication info */
 216         int mds;              /* -1 if same authority as parent */
 217         int ndist;            /* >0 if replicated */
 218         int dist[CEPH_MAX_DIRFRAG_REP];
 219 };
 220
 221 /*
 222  * We cache inode xattrs as an encoded blob until they are first used,
 223  * at which point we parse them into an rbtree.
 224  */
 225 struct ceph_inode_xattr {
 226         struct rb_node node;
 227
 228         const char *name;
 229         int name_len;
 230         const char *val;
 231         int val_len;
 232         int dirty;
 233
 234         int should_free_name;
 235         int should_free_val;
 236 };
 237
 238 /*
 239  * Ceph dentry state
 240  */
 241 struct ceph_dentry_info {
 242         struct ceph_mds_session *lease_session;
 243         u32 lease_gen, lease_shared_gen;
 244         u32 lease_seq;
 245         unsigned long lease_renew_after, lease_renew_from;
 246         struct list_head lru;
 247         struct dentry *dentry;
 248         u64 time;
 249         u64 offset;
 250 };
 251
 252 struct ceph_inode_xattrs_info {
 253         /*
 254          * (still encoded) xattr blob. we avoid the overhead of parsing
 255          * this until someone actually calls getxattr, etc.
 256          *
 257          * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
 258          * NULL means we don't know.
 259         */
 260         struct ceph_buffer *blob, *prealloc_blob;
 261
 262         struct rb_root index;
 263         bool dirty;
 264         int count;
 265         int names_size;
 266         int vals_size;
 267         u64 version, index_version;
 268 };
 269
 270 /*
 271  * Ceph inode.
 272  */
 273 struct ceph_inode_info {
 274         struct ceph_vino i_vino;   /* ceph ino + snap */
 275
 276         spinlock_t i_ceph_lock;
 277
 278         u64 i_version;
 279         u64 i_inline_version;
 280         u32 i_time_warp_seq;
 281
 282         unsigned i_ceph_flags;
 283         atomic64_t i_release_count;
 284         atomic64_t i_ordered_count;
 285         atomic64_t i_complete_seq[2];
 286
 287         struct ceph_dir_layout i_dir_layout;
 288         struct ceph_file_layout i_layout;
 289         size_t i_pool_ns_len;
 290         char *i_symlink;
 291
 292         /* for dirs */
 293         struct timespec i_rctime;
 294         u64 i_rbytes, i_rfiles, i_rsubdirs;
 295         u64 i_files, i_subdirs;
 296
 297         struct rb_root i_fragtree;
 298         struct mutex i_fragtree_mutex;
 299
 300         struct ceph_inode_xattrs_info i_xattrs;
 301
 302         /* capabilities.  protected _both_ by i_ceph_lock and cap->session's
 303          * s_mutex. */
 304         struct rb_root i_caps;           /* cap list */
 305         struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
 306         unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
 307         struct list_head i_dirty_item, i_flushing_item;
 308         /* we need to track cap writeback on a per-cap-bit basis, to allow
 309          * overlapping, pipelined cap flushes to the mds.  we can probably
 310          * reduce the tid to 8 bits if we're concerned about inode size. */
 311         struct ceph_cap_flush *i_prealloc_cap_flush;
 312         struct rb_root i_cap_flush_tree;
 313         wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
 314         unsigned long i_hold_caps_min; /* jiffies */
 315         unsigned long i_hold_caps_max; /* jiffies */
 316         struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
 317         struct ceph_cap_reservation i_cap_migration_resv;
 318         struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
 319         struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
 320                                                     dirty|flushing caps */
 321         unsigned i_snap_caps;           /* cap bits for snapped files */
 322
 323         int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
 324
 325         struct mutex i_truncate_mutex;
 326         u32 i_truncate_seq;        /* last truncate to smaller size */
 327         u64 i_truncate_size;       /*  and the size we last truncated down to */
 328         int i_truncate_pending;    /*  still need to call vmtruncate */
 329
 330         u64 i_max_size;            /* max file size authorized by mds */
 331         u64 i_reported_size; /* (max_)size reported to or requested of mds */
 332         u64 i_wanted_max_size;     /* offset we'd like to write too */
 333         u64 i_requested_max_size;  /* max_size we've requested */
 334
 335         /* held references to caps */
 336         int i_pin_ref;
 337         int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
 338         int i_wrbuffer_ref, i_wrbuffer_ref_head;
 339         u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
 340         u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
 341         u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
 342
 343         struct list_head i_unsafe_writes; /* uncommitted sync writes */
 344         struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
 345         struct list_head i_unsafe_iops;   /* uncommitted mds inode ops */
 346         spinlock_t i_unsafe_lock;
 347
 348         struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
 349         int i_snap_realm_counter; /* snap realm (if caps) */
 350         struct list_head i_snap_realm_item;
 351         struct list_head i_snap_flush_item;
 352
 353         struct work_struct i_wb_work;  /* writeback work */
 354         struct work_struct i_pg_inv_work;  /* page invalidation work */
 355
 356         struct work_struct i_vmtruncate_work;
 357
 358 #ifdef CONFIG_CEPH_FSCACHE
 359         struct fscache_cookie *fscache;
 360         u32 i_fscache_gen; /* sequence, for delayed fscache validate */
 361         struct work_struct i_revalidate_work;
 362 #endif
 363         struct inode vfs_inode; /* at end */
 364 };
 365
 366 static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
 367 {
 368         return container_of(inode, struct ceph_inode_info, vfs_inode);
 369 }
 370
 371 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
 372 {
 373         return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
 374 }
 375
 376 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
 377 {
 378         return (struct ceph_fs_client *)sb->s_fs_info;
 379 }
 380
 381 static inline struct ceph_vino ceph_vino(struct inode *inode)
 382 {
 383         return ceph_inode(inode)->i_vino;
 384 }
 385
 386 /*
 387  * ino_t is <64 bits on many architectures, blech.
 388  *
 389  *               i_ino (kernel inode)   st_ino (userspace)
 390  * i386          32                     32
 391  * x86_64+ino32  64                     32
 392  * x86_64        64                     64
 393  */
 394 static inline u32 ceph_ino_to_ino32(__u64 vino)
 395 {
 396         u32 ino = vino & 0xffffffff;
 397         ino ^= vino >> 32;
 398         if (!ino)
 399                 ino = 2;
 400         return ino;
 401 }
 402
 403 /*
 404  * kernel i_ino value
 405  */
 406 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
 407 {
 408 #if BITS_PER_LONG == 32
 409         return ceph_ino_to_ino32(vino.ino);
 410 #else
 411         return (ino_t)vino.ino;
 412 #endif
 413 }
 414
 415 /*
 416  * user-visible ino (stat, filldir)
 417  */
 418 #if BITS_PER_LONG == 32
 419 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 420 {
 421         return ino;
 422 }
 423 #else
 424 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 425 {
 426         if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
 427                 ino = ceph_ino_to_ino32(ino);
 428         return ino;
 429 }
 430 #endif
 431
 432
 433 /* for printf-style formatting */
 434 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
 435
 436 static inline u64 ceph_ino(struct inode *inode)
 437 {
 438         return ceph_inode(inode)->i_vino.ino;
 439 }
 440 static inline u64 ceph_snap(struct inode *inode)
 441 {
 442         return ceph_inode(inode)->i_vino.snap;
 443 }
 444
 445 static inline int ceph_ino_compare(struct inode *inode, void *data)
 446 {
 447         struct ceph_vino *pvino = (struct ceph_vino *)data;
 448         struct ceph_inode_info *ci = ceph_inode(inode);
 449         return ci->i_vino.ino == pvino->ino &&
 450                 ci->i_vino.snap == pvino->snap;
 451 }
 452
 453 static inline struct inode *ceph_find_inode(struct super_block *sb,
 454                                             struct ceph_vino vino)
 455 {
 456         ino_t t = ceph_vino_to_ino(vino);
 457         return ilookup5(sb, t, ceph_ino_compare, &vino);
 458 }
 459
 460
 461 /*
 462  * Ceph inode.
 463  */
 464 #define CEPH_I_DIR_ORDERED      (1 << 0)  /* dentries in dir are ordered */
 465 #define CEPH_I_NODELAY          (1 << 1)  /* do not delay cap release */
 466 #define CEPH_I_FLUSH            (1 << 2)  /* do not delay flush of dirty metadata */
 467 #define CEPH_I_NOFLUSH          (1 << 3)  /* do not flush dirty caps */
 468 #define CEPH_I_POOL_PERM        (1 << 4)  /* pool rd/wr bits are valid */
 469 #define CEPH_I_POOL_RD          (1 << 5)  /* can read from pool */
 470 #define CEPH_I_POOL_WR          (1 << 6)  /* can write to pool */
 471 #define CEPH_I_SEC_INITED       (1 << 7)  /* security initialized */
 472
 473 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
 474                                            long long release_count,
 475                                            long long ordered_count)
 476 {
 477         smp_mb__before_atomic();
 478         atomic64_set(&ci->i_complete_seq[0], release_count);
 479         atomic64_set(&ci->i_complete_seq[1], ordered_count);
 480 }
 481
 482 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
 483 {
 484         atomic64_inc(&ci->i_release_count);
 485 }
 486
 487 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci)
 488 {
 489         atomic64_inc(&ci->i_ordered_count);
 490 }
 491
 492 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
 493 {
 494         return atomic64_read(&ci->i_complete_seq[0]) ==
 495                 atomic64_read(&ci->i_release_count);
 496 }
 497
 498 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
 499 {
 500         return  atomic64_read(&ci->i_complete_seq[0]) ==
 501                 atomic64_read(&ci->i_release_count) &&
 502                 atomic64_read(&ci->i_complete_seq[1]) ==
 503                 atomic64_read(&ci->i_ordered_count);
 504 }
 505
 506 static inline void ceph_dir_clear_complete(struct inode *inode)
 507 {
 508         __ceph_dir_clear_complete(ceph_inode(inode));
 509 }
 510
 511 static inline void ceph_dir_clear_ordered(struct inode *inode)
 512 {
 513         __ceph_dir_clear_ordered(ceph_inode(inode));
 514 }
 515
 516 static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
 517 {
 518         bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode));
 519         smp_rmb();
 520         return ret;
 521 }
 522
 523 /* find a specific frag @f */
 524 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
 525                                                 u32 f);
 526
 527 /*
 528  * choose fragment for value @v.  copy frag content to pfrag, if leaf
 529  * exists
 530  */
 531 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 532                             struct ceph_inode_frag *pfrag,
 533                             int *found);
 534
 535 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
 536 {
 537         return (struct ceph_dentry_info *)dentry->d_fsdata;
 538 }
 539
 540 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
 541 {
 542         return ((loff_t)frag << 32) | (loff_t)off;
 543 }
 544
 545 /*
 546  * caps helpers
 547  */
 548 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
 549 {
 550         return !RB_EMPTY_ROOT(&ci->i_caps);
 551 }
 552
 553 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
 554 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
 555 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
 556                                     struct ceph_cap *cap);
 557
 558 static inline int ceph_caps_issued(struct ceph_inode_info *ci)
 559 {
 560         int issued;
 561         spin_lock(&ci->i_ceph_lock);
 562         issued = __ceph_caps_issued(ci, NULL);
 563         spin_unlock(&ci->i_ceph_lock);
 564         return issued;
 565 }
 566
 567 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
 568                                         int touch)
 569 {
 570         int r;
 571         spin_lock(&ci->i_ceph_lock);
 572         r = __ceph_caps_issued_mask(ci, mask, touch);
 573         spin_unlock(&ci->i_ceph_lock);
 574         return r;
 575 }
 576
 577 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
 578 {
 579         return ci->i_dirty_caps | ci->i_flushing_caps;
 580 }
 581 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void);
 582 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf);
 583 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
 584                                   struct ceph_cap_flush **pcf);
 585
 586 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
 587                                       struct ceph_cap *ocap, int mask);
 588 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
 589 extern int __ceph_caps_used(struct ceph_inode_info *ci);
 590
 591 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
 592
 593 /*
 594  * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
 595  */
 596 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
 597 {
 598         int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
 599         if (w & CEPH_CAP_FILE_BUFFER)
 600                 w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
 601         return w;
 602 }
 603
 604 /* what the mds thinks we want */
 605 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
 606
 607 extern void ceph_caps_init(struct ceph_mds_client *mdsc);
 608 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
 609 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
 610 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc,
 611                              struct ceph_cap_reservation *ctx, int need);
 612 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
 613                                struct ceph_cap_reservation *ctx);
 614 extern void ceph_reservation_status(struct ceph_fs_client *client,
 615                                     int *total, int *avail, int *used,
 616                                     int *reserved, int *min);
 617
 618
 619
 620 /*
 621  * we keep buffered readdir results attached to file->private_data
 622  */
 623 #define CEPH_F_SYNC     1
 624 #define CEPH_F_ATEND    2
 625
 626 struct ceph_file_info {
 627         short fmode;     /* initialized on open */
 628         short flags;     /* CEPH_F_* */
 629
 630         /* readdir: position within the dir */
 631         u32 frag;
 632         struct ceph_mds_request *last_readdir;
 633
 634         /* readdir: position within a frag */
 635         unsigned offset;       /* offset of last chunk, adjusted for . and .. */
 636         unsigned next_offset;  /* offset of next chunk (last_name's + 1) */
 637         char *last_name;       /* last entry in previous chunk */
 638         long long dir_release_count;
 639         long long dir_ordered_count;
 640         int readdir_cache_idx;
 641
 642         /* used for -o dirstat read() on directory thing */
 643         char *dir_info;
 644         int dir_info_len;
 645 };
 646
 647 struct ceph_readdir_cache_control {
 648         struct page  *page;
 649         struct dentry **dentries;
 650         int index;
 651 };
 652
 653 /*
 654  * A "snap realm" describes a subset of the file hierarchy sharing
 655  * the same set of snapshots that apply to it.  The realms themselves
 656  * are organized into a hierarchy, such that children inherit (some of)
 657  * the snapshots of their parents.
 658  *
 659  * All inodes within the realm that have capabilities are linked into a
 660  * per-realm list.
 661  */
 662 struct ceph_snap_realm {
 663         u64 ino;
 664         atomic_t nref;
 665         struct rb_node node;
 666
 667         u64 created, seq;
 668         u64 parent_ino;
 669         u64 parent_since;   /* snapid when our current parent became so */
 670
 671         u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
 672         u32 num_prior_parent_snaps;   /*  had prior to parent_since */
 673         u64 *snaps;                   /* snaps specific to this realm */
 674         u32 num_snaps;
 675
 676         struct ceph_snap_realm *parent;
 677         struct list_head children;       /* list of child realms */
 678         struct list_head child_item;
 679
 680         struct list_head empty_item;     /* if i have ref==0 */
 681
 682         struct list_head dirty_item;     /* if realm needs new context */
 683
 684         /* the current set of snaps for this realm */
 685         struct ceph_snap_context *cached_context;
 686
 687         struct list_head inodes_with_caps;
 688         spinlock_t inodes_with_caps_lock;
 689 };
 690
 691 static inline int default_congestion_kb(void)
 692 {
 693         int congestion_kb;
 694
 695         /*
 696          * Copied from NFS
 697          *
 698          * congestion size, scale with available memory.
 699          *
 700          *  64MB:    8192k
 701          * 128MB:   11585k
 702          * 256MB:   16384k
 703          * 512MB:   23170k
 704          *   1GB:   32768k
 705          *   2GB:   46340k
 706          *   4GB:   65536k
 707          *   8GB:   92681k
 708          *  16GB:  131072k
 709          *
 710          * This allows larger machines to have larger/more transfers.
 711          * Limit the default to 256M
 712          */
 713         congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 714         if (congestion_kb > 256*1024)
 715                 congestion_kb = 256*1024;
 716
 717         return congestion_kb;
 718 }
 719
 720
 721
 722 /* snap.c */
 723 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
 724                                                u64 ino);
 725 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
 726                                 struct ceph_snap_realm *realm);
 727 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
 728                                 struct ceph_snap_realm *realm);
 729 extern int ceph_update_snap_trace(struct ceph_mds_client *m,
 730                                   void *p, void *e, bool deletion,
 731                                   struct ceph_snap_realm **realm_ret);
 732 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
 733                              struct ceph_mds_session *session,
 734                              struct ceph_msg *msg);
 735 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
 736 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 737                                   struct ceph_cap_snap *capsnap);
 738 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
 739
 740 /*
 741  * a cap_snap is "pending" if it is still awaiting an in-progress
 742  * sync write (that may/may not still update size, mtime, etc.).
 743  */
 744 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
 745 {
 746         return !list_empty(&ci->i_cap_snaps) &&
 747                list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap,
 748                                ci_item)->writing;
 749 }
 750
 751 /* inode.c */
 752 extern const struct inode_operations ceph_file_iops;
 753
 754 extern struct inode *ceph_alloc_inode(struct super_block *sb);
 755 extern void ceph_destroy_inode(struct inode *inode);
 756 extern int ceph_drop_inode(struct inode *inode);
 757
 758 extern struct inode *ceph_get_inode(struct super_block *sb,
 759                                     struct ceph_vino vino);
 760 extern struct inode *ceph_get_snapdir(struct inode *parent);
 761 extern int ceph_fill_file_size(struct inode *inode, int issued,
 762                                u32 truncate_seq, u64 truncate_size, u64 size);
 763 extern void ceph_fill_file_time(struct inode *inode, int issued,
 764                                 u64 time_warp_seq, struct timespec *ctime,
 765                                 struct timespec *mtime, struct timespec *atime);
 766 extern int ceph_fill_trace(struct super_block *sb,
 767                            struct ceph_mds_request *req,
 768                            struct ceph_mds_session *session);
 769 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 770                                     struct ceph_mds_session *session);
 771
 772 extern int ceph_inode_holds_cap(struct inode *inode, int mask);
 773
 774 extern int ceph_inode_set_size(struct inode *inode, loff_t size);
 775 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
 776 extern void ceph_queue_vmtruncate(struct inode *inode);
 777
 778 extern void ceph_queue_invalidate(struct inode *inode);
 779 extern void ceph_queue_writeback(struct inode *inode);
 780
 781 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
 782                              int mask, bool force);
 783 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
 784 {
 785         return __ceph_do_getattr(inode, NULL, mask, force);
 786 }
 787 extern int ceph_permission(struct inode *inode, int mask);
 788 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 789 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
 790                         struct kstat *stat);
 791
 792 /* xattr.c */
 793 extern int ceph_setxattr(struct dentry *, const char *, const void *,
 794                          size_t, int);
 795 int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int);
 796 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
 797 int __ceph_removexattr(struct dentry *, const char *);
 798 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
 799 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 800 extern int ceph_removexattr(struct dentry *, const char *);
 801 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
 802 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 803 extern void __init ceph_xattr_init(void);
 804 extern void ceph_xattr_exit(void);
 805 extern const struct xattr_handler *ceph_xattr_handlers[];
 806
 807 #ifdef CONFIG_SECURITY
 808 extern bool ceph_security_xattr_deadlock(struct inode *in);
 809 extern bool ceph_security_xattr_wanted(struct inode *in);
 810 #else
 811 static inline bool ceph_security_xattr_deadlock(struct inode *in)
 812 {
 813         return false;
 814 }
 815 static inline bool ceph_security_xattr_wanted(struct inode *in)
 816 {
 817         return false;
 818 }
 819 #endif
 820
 821 /* acl.c */
 822 struct ceph_acls_info {
 823         void *default_acl;
 824         void *acl;
 825         struct ceph_pagelist *pagelist;
 826 };
 827
 828 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 829
 830 struct posix_acl *ceph_get_acl(struct inode *, int);
 831 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 832 int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 833                        struct ceph_acls_info *info);
 834 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
 835 void ceph_release_acls_info(struct ceph_acls_info *info);
 836
 837 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 838 {
 839        forget_all_cached_acls(inode);
 840 }
 841
 842 #else
 843
 844 #define ceph_get_acl NULL
 845 #define ceph_set_acl NULL
 846
 847 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 848                                      struct ceph_acls_info *info)
 849 {
 850         return 0;
 851 }
 852 static inline void ceph_init_inode_acls(struct inode *inode,
 853                                         struct ceph_acls_info *info)
 854 {
 855 }
 856 static inline void ceph_release_acls_info(struct ceph_acls_info *info)
 857 {
 858 }
 859 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
 860 {
 861         return 0;
 862 }
 863
 864 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 865 {
 866 }
 867
 868 #endif
 869
 870 /* caps.c */
 871 extern const char *ceph_cap_string(int c);
 872 extern void ceph_handle_caps(struct ceph_mds_session *session,
 873                              struct ceph_msg *msg);
 874 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
 875                                      struct ceph_cap_reservation *ctx);
 876 extern void ceph_add_cap(struct inode *inode,
 877                          struct ceph_mds_session *session, u64 cap_id,
 878                          int fmode, unsigned issued, unsigned wanted,
 879                          unsigned cap, unsigned seq, u64 realmino, int flags,
 880                          struct ceph_cap **new_cap);
 881 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 882 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
 883                          struct ceph_cap *cap);
 884 extern int ceph_is_any_caps(struct inode *inode);
 885
 886 extern void ceph_queue_caps_release(struct inode *inode);
 887 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
 888 extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
 889                       int datasync);
 890 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
 891                                           struct ceph_mds_session *session);
 892 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
 893                                     struct ceph_mds_session *session);
 894 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
 895                                              int mds);
 896 extern int ceph_get_cap_mds(struct inode *inode);
 897 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
 898 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
 899 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 900                                        struct ceph_snap_context *snapc);
 901 extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
 902                                struct ceph_mds_session **psession,
 903                                int again);
 904 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 905                             struct ceph_mds_session *session);
 906 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
 907 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
 908
 909 extern int ceph_encode_inode_release(void **p, struct inode *inode,
 910                                      int mds, int drop, int unless, int force);
 911 extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 912                                       int mds, int drop, int unless);
 913
 914 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
 915                          loff_t endoff, int *got, struct page **pinned_page);
 916
 917 /* for counting open files by mode */
 918 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
 919 {
 920         ci->i_nr_by_mode[mode]++;
 921 }
 922 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
 923
 924 /* addr.c */
 925 extern const struct address_space_operations ceph_aops;
 926 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 927 extern int ceph_uninline_data(struct file *filp, struct page *locked_page);
 928 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need);
 929 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc);
 930
 931 /* file.c */
 932 extern const struct file_operations ceph_file_fops;
 933
 934 extern int ceph_open(struct inode *inode, struct file *file);
 935 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 936                             struct file *file, unsigned flags, umode_t mode,
 937                             int *opened);
 938 extern int ceph_release(struct inode *inode, struct file *filp);
 939 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
 940                                   char *data, size_t len);
 941 /* dir.c */
 942 extern const struct file_operations ceph_dir_fops;
 943 extern const struct file_operations ceph_snapdir_fops;
 944 extern const struct inode_operations ceph_dir_iops;
 945 extern const struct inode_operations ceph_snapdir_iops;
 946 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
 947         ceph_snapdir_dentry_ops;
 948
 949 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
 950 extern int ceph_handle_snapdir(struct ceph_mds_request *req,
 951                                struct dentry *dentry, int err);
 952 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 953                                          struct dentry *dentry, int err);
 954
 955 extern void ceph_dentry_lru_add(struct dentry *dn);
 956 extern void ceph_dentry_lru_touch(struct dentry *dn);
 957 extern void ceph_dentry_lru_del(struct dentry *dn);
 958 extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 959 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
 960 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl);
 961
 962 /*
 963  * our d_ops vary depending on whether the inode is live,
 964  * snapshotted (read-only), or a virtual ".snap" directory.
 965  */
 966 int ceph_init_dentry(struct dentry *dentry);
 967
 968
 969 /* ioctl.c */
 970 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 971
 972 /* export.c */
 973 extern const struct export_operations ceph_export_ops;
 974
 975 /* locks.c */
 976 extern __init void ceph_flock_init(void);
 977 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
 978 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
 979 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
 980 extern int ceph_encode_locks_to_buffer(struct inode *inode,
 981                                        struct ceph_filelock *flocks,
 982                                        int num_fcntl_locks,
 983                                        int num_flock_locks);
 984 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
 985                                   struct ceph_pagelist *pagelist,
 986                                   int num_fcntl_locks, int num_flock_locks);
 987 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
 988
 989 /* debugfs.c */
 990 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
 991 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
 992
 993 #endif /* _FS_CEPH_SUPER_H */