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