linux/fs/ceph/super.h
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   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
  17#include <linux/ceph/libceph.h>
  18
  19#ifdef CONFIG_CEPH_FSCACHE
  20#include <linux/fscache.h>
  21#endif
  22
  23/* f_type in struct statfs */
  24#define CEPH_SUPER_MAGIC 0x00c36400
  25
  26/* large granularity for statfs utilization stats to facilitate
  27 * large volume sizes on 32-bit machines. */
  28#define CEPH_BLOCK_SHIFT   22  /* 4 MB */
  29#define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
  30
  31#define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
  32#define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
  33#define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */
  34#define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */
  35#define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */
  36#define CEPH_MOUNT_OPT_FSCACHE         (1<<10) /* use fscache */
  37
  38#define CEPH_MOUNT_OPT_DEFAULT    (CEPH_MOUNT_OPT_RBYTES)
  39
  40#define ceph_set_mount_opt(fsc, opt) \
  41        (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
  42#define ceph_test_mount_opt(fsc, opt) \
  43        (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
  44
  45#define CEPH_RSIZE_DEFAULT             0           /* max read size */
  46#define CEPH_RASIZE_DEFAULT            (8192*1024) /* readahead */
  47#define CEPH_MAX_READDIR_DEFAULT        1024
  48#define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
  49#define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
  50
  51struct ceph_mount_options {
  52        int flags;
  53        int sb_flags;
  54
  55        int wsize;            /* max write size */
  56        int rsize;            /* max read size */
  57        int rasize;           /* max readahead */
  58        int congestion_kb;    /* max writeback in flight */
  59        int caps_wanted_delay_min, caps_wanted_delay_max;
  60        int cap_release_safety;
  61        int max_readdir;       /* max readdir result (entires) */
  62        int max_readdir_bytes; /* max readdir result (bytes) */
  63
  64        /*
  65         * everything above this point can be memcmp'd; everything below
  66         * is handled in compare_mount_options()
  67         */
  68
  69        char *snapdir_name;   /* default ".snap" */
  70};
  71
  72struct ceph_fs_client {
  73        struct super_block *sb;
  74
  75        struct ceph_mount_options *mount_options;
  76        struct ceph_client *client;
  77
  78        unsigned long mount_state;
  79        int min_caps;                  /* min caps i added */
  80
  81        struct ceph_mds_client *mdsc;
  82
  83        /* writeback */
  84        mempool_t *wb_pagevec_pool;
  85        struct workqueue_struct *wb_wq;
  86        struct workqueue_struct *pg_inv_wq;
  87        struct workqueue_struct *trunc_wq;
  88        atomic_long_t writeback_count;
  89
  90        struct backing_dev_info backing_dev_info;
  91
  92#ifdef CONFIG_DEBUG_FS
  93        struct dentry *debugfs_dentry_lru, *debugfs_caps;
  94        struct dentry *debugfs_congestion_kb;
  95        struct dentry *debugfs_bdi;
  96        struct dentry *debugfs_mdsc, *debugfs_mdsmap;
  97#endif
  98
  99#ifdef CONFIG_CEPH_FSCACHE
 100        struct fscache_cookie *fscache;
 101        struct workqueue_struct *revalidate_wq;
 102#endif
 103};
 104
 105
 106/*
 107 * File i/o capability.  This tracks shared state with the metadata
 108 * server that allows us to cache or writeback attributes or to read
 109 * and write data.  For any given inode, we should have one or more
 110 * capabilities, one issued by each metadata server, and our
 111 * cumulative access is the OR of all issued capabilities.
 112 *
 113 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
 114 * session capability lists.
 115 */
 116struct ceph_cap {
 117        struct ceph_inode_info *ci;
 118        struct rb_node ci_node;          /* per-ci cap tree */
 119        struct ceph_mds_session *session;
 120        struct list_head session_caps;   /* per-session caplist */
 121        int mds;
 122        u64 cap_id;       /* unique cap id (mds provided) */
 123        int issued;       /* latest, from the mds */
 124        int implemented;  /* implemented superset of issued (for revocation) */
 125        int mds_wanted;
 126        u32 seq, issue_seq, mseq;
 127        u32 cap_gen;      /* active/stale cycle */
 128        unsigned long last_used;
 129        struct list_head caps_item;
 130};
 131
 132#define CHECK_CAPS_NODELAY    1  /* do not delay any further */
 133#define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
 134#define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
 135
 136/*
 137 * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
 138 * we first complete any in-process sync writes and writeback any dirty
 139 * data before flushing the snapped state (tracked here) back to the MDS.
 140 */
 141struct ceph_cap_snap {
 142        atomic_t nref;
 143        struct ceph_inode_info *ci;
 144        struct list_head ci_item, flushing_item;
 145
 146        u64 follows, flush_tid;
 147        int issued, dirty;
 148        struct ceph_snap_context *context;
 149
 150        umode_t mode;
 151        kuid_t uid;
 152        kgid_t gid;
 153
 154        struct ceph_buffer *xattr_blob;
 155        u64 xattr_version;
 156
 157        u64 size;
 158        struct timespec mtime, atime, ctime;
 159        u64 time_warp_seq;
 160        int writing;   /* a sync write is still in progress */
 161        int dirty_pages;     /* dirty pages awaiting writeback */
 162};
 163
 164static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
 165{
 166        if (atomic_dec_and_test(&capsnap->nref)) {
 167                if (capsnap->xattr_blob)
 168                        ceph_buffer_put(capsnap->xattr_blob);
 169                kfree(capsnap);
 170        }
 171}
 172
 173/*
 174 * The frag tree describes how a directory is fragmented, potentially across
 175 * multiple metadata servers.  It is also used to indicate points where
 176 * metadata authority is delegated, and whether/where metadata is replicated.
 177 *
 178 * A _leaf_ frag will be present in the i_fragtree IFF there is
 179 * delegation info.  That is, if mds >= 0 || ndist > 0.
 180 */
 181#define CEPH_MAX_DIRFRAG_REP 4
 182
 183struct ceph_inode_frag {
 184        struct rb_node node;
 185
 186        /* fragtree state */
 187        u32 frag;
 188        int split_by;         /* i.e. 2^(split_by) children */
 189
 190        /* delegation and replication info */
 191        int mds;              /* -1 if same authority as parent */
 192        int ndist;            /* >0 if replicated */
 193        int dist[CEPH_MAX_DIRFRAG_REP];
 194};
 195
 196/*
 197 * We cache inode xattrs as an encoded blob until they are first used,
 198 * at which point we parse them into an rbtree.
 199 */
 200struct ceph_inode_xattr {
 201        struct rb_node node;
 202
 203        const char *name;
 204        int name_len;
 205        const char *val;
 206        int val_len;
 207        int dirty;
 208
 209        int should_free_name;
 210        int should_free_val;
 211};
 212
 213/*
 214 * Ceph dentry state
 215 */
 216struct ceph_dentry_info {
 217        struct ceph_mds_session *lease_session;
 218        u32 lease_gen, lease_shared_gen;
 219        u32 lease_seq;
 220        unsigned long lease_renew_after, lease_renew_from;
 221        struct list_head lru;
 222        struct dentry *dentry;
 223        u64 time;
 224        u64 offset;
 225};
 226
 227struct ceph_inode_xattrs_info {
 228        /*
 229         * (still encoded) xattr blob. we avoid the overhead of parsing
 230         * this until someone actually calls getxattr, etc.
 231         *
 232         * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
 233         * NULL means we don't know.
 234        */
 235        struct ceph_buffer *blob, *prealloc_blob;
 236
 237        struct rb_root index;
 238        bool dirty;
 239        int count;
 240        int names_size;
 241        int vals_size;
 242        u64 version, index_version;
 243};
 244
 245/*
 246 * Ceph inode.
 247 */
 248struct ceph_inode_info {
 249        struct ceph_vino i_vino;   /* ceph ino + snap */
 250
 251        spinlock_t i_ceph_lock;
 252
 253        u64 i_version;
 254        u32 i_time_warp_seq;
 255
 256        unsigned i_ceph_flags;
 257        atomic_t i_release_count;
 258        atomic_t i_complete_count;
 259
 260        struct ceph_dir_layout i_dir_layout;
 261        struct ceph_file_layout i_layout;
 262        char *i_symlink;
 263
 264        /* for dirs */
 265        struct timespec i_rctime;
 266        u64 i_rbytes, i_rfiles, i_rsubdirs;
 267        u64 i_files, i_subdirs;
 268        u64 i_max_offset;  /* largest readdir offset, set with complete dir */
 269
 270        struct rb_root i_fragtree;
 271        struct mutex i_fragtree_mutex;
 272
 273        struct ceph_inode_xattrs_info i_xattrs;
 274
 275        /* capabilities.  protected _both_ by i_ceph_lock and cap->session's
 276         * s_mutex. */
 277        struct rb_root i_caps;           /* cap list */
 278        struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
 279        unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
 280        struct list_head i_dirty_item, i_flushing_item;
 281        u64 i_cap_flush_seq;
 282        /* we need to track cap writeback on a per-cap-bit basis, to allow
 283         * overlapping, pipelined cap flushes to the mds.  we can probably
 284         * reduce the tid to 8 bits if we're concerned about inode size. */
 285        u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
 286        wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
 287        unsigned long i_hold_caps_min; /* jiffies */
 288        unsigned long i_hold_caps_max; /* jiffies */
 289        struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
 290        int i_cap_exporting_mds;         /* to handle cap migration between */
 291        unsigned i_cap_exporting_mseq;   /*  mds's. */
 292        unsigned i_cap_exporting_issued;
 293        struct ceph_cap_reservation i_cap_migration_resv;
 294        struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
 295        struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
 296                                                    dirty|flushing caps */
 297        unsigned i_snap_caps;           /* cap bits for snapped files */
 298
 299        int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
 300
 301        struct mutex i_truncate_mutex;
 302        u32 i_truncate_seq;        /* last truncate to smaller size */
 303        u64 i_truncate_size;       /*  and the size we last truncated down to */
 304        int i_truncate_pending;    /*  still need to call vmtruncate */
 305
 306        u64 i_max_size;            /* max file size authorized by mds */
 307        u64 i_reported_size; /* (max_)size reported to or requested of mds */
 308        u64 i_wanted_max_size;     /* offset we'd like to write too */
 309        u64 i_requested_max_size;  /* max_size we've requested */
 310
 311        /* held references to caps */
 312        int i_pin_ref;
 313        int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
 314        int i_wrbuffer_ref, i_wrbuffer_ref_head;
 315        u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
 316        u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
 317        u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
 318
 319        struct list_head i_unsafe_writes; /* uncommitted sync writes */
 320        struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
 321        spinlock_t i_unsafe_lock;
 322
 323        struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
 324        int i_snap_realm_counter; /* snap realm (if caps) */
 325        struct list_head i_snap_realm_item;
 326        struct list_head i_snap_flush_item;
 327
 328        struct work_struct i_wb_work;  /* writeback work */
 329        struct work_struct i_pg_inv_work;  /* page invalidation work */
 330
 331        struct work_struct i_vmtruncate_work;
 332
 333#ifdef CONFIG_CEPH_FSCACHE
 334        struct fscache_cookie *fscache;
 335        u32 i_fscache_gen; /* sequence, for delayed fscache validate */
 336        struct work_struct i_revalidate_work;
 337#endif
 338
 339        struct inode vfs_inode; /* at end */
 340};
 341
 342static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
 343{
 344        return container_of(inode, struct ceph_inode_info, vfs_inode);
 345}
 346
 347static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
 348{
 349        return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
 350}
 351
 352static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
 353{
 354        return (struct ceph_fs_client *)sb->s_fs_info;
 355}
 356
 357static inline struct ceph_vino ceph_vino(struct inode *inode)
 358{
 359        return ceph_inode(inode)->i_vino;
 360}
 361
 362/*
 363 * ino_t is <64 bits on many architectures, blech.
 364 *
 365 *               i_ino (kernel inode)   st_ino (userspace)
 366 * i386          32                     32
 367 * x86_64+ino32  64                     32
 368 * x86_64        64                     64
 369 */
 370static inline u32 ceph_ino_to_ino32(__u64 vino)
 371{
 372        u32 ino = vino & 0xffffffff;
 373        ino ^= vino >> 32;
 374        if (!ino)
 375                ino = 2;
 376        return ino;
 377}
 378
 379/*
 380 * kernel i_ino value
 381 */
 382static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
 383{
 384#if BITS_PER_LONG == 32
 385        return ceph_ino_to_ino32(vino.ino);
 386#else
 387        return (ino_t)vino.ino;
 388#endif
 389}
 390
 391/*
 392 * user-visible ino (stat, filldir)
 393 */
 394#if BITS_PER_LONG == 32
 395static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 396{
 397        return ino;
 398}
 399#else
 400static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 401{
 402        if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
 403                ino = ceph_ino_to_ino32(ino);
 404        return ino;
 405}
 406#endif
 407
 408
 409/* for printf-style formatting */
 410#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
 411
 412static inline u64 ceph_ino(struct inode *inode)
 413{
 414        return ceph_inode(inode)->i_vino.ino;
 415}
 416static inline u64 ceph_snap(struct inode *inode)
 417{
 418        return ceph_inode(inode)->i_vino.snap;
 419}
 420
 421static inline int ceph_ino_compare(struct inode *inode, void *data)
 422{
 423        struct ceph_vino *pvino = (struct ceph_vino *)data;
 424        struct ceph_inode_info *ci = ceph_inode(inode);
 425        return ci->i_vino.ino == pvino->ino &&
 426                ci->i_vino.snap == pvino->snap;
 427}
 428
 429static inline struct inode *ceph_find_inode(struct super_block *sb,
 430                                            struct ceph_vino vino)
 431{
 432        ino_t t = ceph_vino_to_ino(vino);
 433        return ilookup5(sb, t, ceph_ino_compare, &vino);
 434}
 435
 436
 437/*
 438 * Ceph inode.
 439 */
 440#define CEPH_I_NODELAY   4  /* do not delay cap release */
 441#define CEPH_I_FLUSH     8  /* do not delay flush of dirty metadata */
 442#define CEPH_I_NOFLUSH  16  /* do not flush dirty caps */
 443
 444static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
 445                                           int release_count)
 446{
 447        atomic_set(&ci->i_complete_count, release_count);
 448}
 449
 450static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
 451{
 452        atomic_inc(&ci->i_release_count);
 453}
 454
 455static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
 456{
 457        return atomic_read(&ci->i_complete_count) ==
 458                atomic_read(&ci->i_release_count);
 459}
 460
 461static inline void ceph_dir_clear_complete(struct inode *inode)
 462{
 463        __ceph_dir_clear_complete(ceph_inode(inode));
 464}
 465
 466static inline bool ceph_dir_is_complete(struct inode *inode)
 467{
 468        return __ceph_dir_is_complete(ceph_inode(inode));
 469}
 470
 471
 472/* find a specific frag @f */
 473extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
 474                                                u32 f);
 475
 476/*
 477 * choose fragment for value @v.  copy frag content to pfrag, if leaf
 478 * exists
 479 */
 480extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 481                            struct ceph_inode_frag *pfrag,
 482                            int *found);
 483
 484static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
 485{
 486        return (struct ceph_dentry_info *)dentry->d_fsdata;
 487}
 488
 489static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
 490{
 491        return ((loff_t)frag << 32) | (loff_t)off;
 492}
 493
 494/*
 495 * caps helpers
 496 */
 497static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
 498{
 499        return !RB_EMPTY_ROOT(&ci->i_caps);
 500}
 501
 502extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
 503extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
 504extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
 505                                    struct ceph_cap *cap);
 506
 507static inline int ceph_caps_issued(struct ceph_inode_info *ci)
 508{
 509        int issued;
 510        spin_lock(&ci->i_ceph_lock);
 511        issued = __ceph_caps_issued(ci, NULL);
 512        spin_unlock(&ci->i_ceph_lock);
 513        return issued;
 514}
 515
 516static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
 517                                        int touch)
 518{
 519        int r;
 520        spin_lock(&ci->i_ceph_lock);
 521        r = __ceph_caps_issued_mask(ci, mask, touch);
 522        spin_unlock(&ci->i_ceph_lock);
 523        return r;
 524}
 525
 526static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
 527{
 528        return ci->i_dirty_caps | ci->i_flushing_caps;
 529}
 530extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
 531
 532extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
 533extern int __ceph_caps_used(struct ceph_inode_info *ci);
 534
 535extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
 536
 537/*
 538 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
 539 */
 540static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
 541{
 542        int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
 543        if (w & CEPH_CAP_FILE_BUFFER)
 544                w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
 545        return w;
 546}
 547
 548/* what the mds thinks we want */
 549extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
 550
 551extern void ceph_caps_init(struct ceph_mds_client *mdsc);
 552extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
 553extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
 554extern void ceph_reserve_caps(struct ceph_mds_client *mdsc,
 555                             struct ceph_cap_reservation *ctx, int need);
 556extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
 557                               struct ceph_cap_reservation *ctx);
 558extern void ceph_reservation_status(struct ceph_fs_client *client,
 559                                    int *total, int *avail, int *used,
 560                                    int *reserved, int *min);
 561
 562
 563
 564/*
 565 * we keep buffered readdir results attached to file->private_data
 566 */
 567#define CEPH_F_SYNC     1
 568#define CEPH_F_ATEND    2
 569
 570struct ceph_file_info {
 571        short fmode;     /* initialized on open */
 572        short flags;     /* CEPH_F_* */
 573
 574        /* readdir: position within the dir */
 575        u32 frag;
 576        struct ceph_mds_request *last_readdir;
 577
 578        /* readdir: position within a frag */
 579        unsigned offset;       /* offset of last chunk, adjusted for . and .. */
 580        u64 next_offset;       /* offset of next chunk (last_name's + 1) */
 581        char *last_name;       /* last entry in previous chunk */
 582        struct dentry *dentry; /* next dentry (for dcache readdir) */
 583        int dir_release_count;
 584
 585        /* used for -o dirstat read() on directory thing */
 586        char *dir_info;
 587        int dir_info_len;
 588};
 589
 590
 591
 592/*
 593 * A "snap realm" describes a subset of the file hierarchy sharing
 594 * the same set of snapshots that apply to it.  The realms themselves
 595 * are organized into a hierarchy, such that children inherit (some of)
 596 * the snapshots of their parents.
 597 *
 598 * All inodes within the realm that have capabilities are linked into a
 599 * per-realm list.
 600 */
 601struct ceph_snap_realm {
 602        u64 ino;
 603        atomic_t nref;
 604        struct rb_node node;
 605
 606        u64 created, seq;
 607        u64 parent_ino;
 608        u64 parent_since;   /* snapid when our current parent became so */
 609
 610        u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
 611        u32 num_prior_parent_snaps;   /*  had prior to parent_since */
 612        u64 *snaps;                   /* snaps specific to this realm */
 613        u32 num_snaps;
 614
 615        struct ceph_snap_realm *parent;
 616        struct list_head children;       /* list of child realms */
 617        struct list_head child_item;
 618
 619        struct list_head empty_item;     /* if i have ref==0 */
 620
 621        struct list_head dirty_item;     /* if realm needs new context */
 622
 623        /* the current set of snaps for this realm */
 624        struct ceph_snap_context *cached_context;
 625
 626        struct list_head inodes_with_caps;
 627        spinlock_t inodes_with_caps_lock;
 628};
 629
 630static inline int default_congestion_kb(void)
 631{
 632        int congestion_kb;
 633
 634        /*
 635         * Copied from NFS
 636         *
 637         * congestion size, scale with available memory.
 638         *
 639         *  64MB:    8192k
 640         * 128MB:   11585k
 641         * 256MB:   16384k
 642         * 512MB:   23170k
 643         *   1GB:   32768k
 644         *   2GB:   46340k
 645         *   4GB:   65536k
 646         *   8GB:   92681k
 647         *  16GB:  131072k
 648         *
 649         * This allows larger machines to have larger/more transfers.
 650         * Limit the default to 256M
 651         */
 652        congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 653        if (congestion_kb > 256*1024)
 654                congestion_kb = 256*1024;
 655
 656        return congestion_kb;
 657}
 658
 659
 660
 661/* snap.c */
 662struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
 663                                               u64 ino);
 664extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
 665                                struct ceph_snap_realm *realm);
 666extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
 667                                struct ceph_snap_realm *realm);
 668extern int ceph_update_snap_trace(struct ceph_mds_client *m,
 669                                  void *p, void *e, bool deletion);
 670extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
 671                             struct ceph_mds_session *session,
 672                             struct ceph_msg *msg);
 673extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
 674extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 675                                  struct ceph_cap_snap *capsnap);
 676extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
 677
 678/*
 679 * a cap_snap is "pending" if it is still awaiting an in-progress
 680 * sync write (that may/may not still update size, mtime, etc.).
 681 */
 682static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
 683{
 684        return !list_empty(&ci->i_cap_snaps) &&
 685                list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
 686                           ci_item)->writing;
 687}
 688
 689/* inode.c */
 690extern const struct inode_operations ceph_file_iops;
 691
 692extern struct inode *ceph_alloc_inode(struct super_block *sb);
 693extern void ceph_destroy_inode(struct inode *inode);
 694
 695extern struct inode *ceph_get_inode(struct super_block *sb,
 696                                    struct ceph_vino vino);
 697extern struct inode *ceph_get_snapdir(struct inode *parent);
 698extern int ceph_fill_file_size(struct inode *inode, int issued,
 699                               u32 truncate_seq, u64 truncate_size, u64 size);
 700extern void ceph_fill_file_time(struct inode *inode, int issued,
 701                                u64 time_warp_seq, struct timespec *ctime,
 702                                struct timespec *mtime, struct timespec *atime);
 703extern int ceph_fill_trace(struct super_block *sb,
 704                           struct ceph_mds_request *req,
 705                           struct ceph_mds_session *session);
 706extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 707                                    struct ceph_mds_session *session);
 708
 709extern int ceph_inode_holds_cap(struct inode *inode, int mask);
 710
 711extern int ceph_inode_set_size(struct inode *inode, loff_t size);
 712extern void __ceph_do_pending_vmtruncate(struct inode *inode);
 713extern void ceph_queue_vmtruncate(struct inode *inode);
 714
 715extern void ceph_queue_invalidate(struct inode *inode);
 716extern void ceph_queue_writeback(struct inode *inode);
 717
 718extern int ceph_do_getattr(struct inode *inode, int mask);
 719extern int ceph_permission(struct inode *inode, int mask);
 720extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 721extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
 722                        struct kstat *stat);
 723
 724/* xattr.c */
 725extern int ceph_setxattr(struct dentry *, const char *, const void *,
 726                         size_t, int);
 727extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
 728extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 729extern int ceph_removexattr(struct dentry *, const char *);
 730extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
 731extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 732extern void __init ceph_xattr_init(void);
 733extern void ceph_xattr_exit(void);
 734
 735/* caps.c */
 736extern const char *ceph_cap_string(int c);
 737extern void ceph_handle_caps(struct ceph_mds_session *session,
 738                             struct ceph_msg *msg);
 739extern int ceph_add_cap(struct inode *inode,
 740                        struct ceph_mds_session *session, u64 cap_id,
 741                        int fmode, unsigned issued, unsigned wanted,
 742                        unsigned cap, unsigned seq, u64 realmino, int flags,
 743                        struct ceph_cap_reservation *caps_reservation);
 744extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 745extern void ceph_put_cap(struct ceph_mds_client *mdsc,
 746                         struct ceph_cap *cap);
 747
 748extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino,
 749                                u64 cap_id, u32 migrate_seq, u32 issue_seq);
 750extern void ceph_queue_caps_release(struct inode *inode);
 751extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
 752extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
 753                      int datasync);
 754extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
 755                                    struct ceph_mds_session *session);
 756extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
 757                                             int mds);
 758extern int ceph_get_cap_mds(struct inode *inode);
 759extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
 760extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
 761extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 762                                       struct ceph_snap_context *snapc);
 763extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
 764                               struct ceph_mds_session **psession,
 765                               int again);
 766extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 767                            struct ceph_mds_session *session);
 768extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
 769extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
 770
 771extern int ceph_encode_inode_release(void **p, struct inode *inode,
 772                                     int mds, int drop, int unless, int force);
 773extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 774                                      int mds, int drop, int unless);
 775
 776extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
 777                         int *got, loff_t endoff);
 778
 779/* for counting open files by mode */
 780static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
 781{
 782        ci->i_nr_by_mode[mode]++;
 783}
 784extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
 785
 786/* addr.c */
 787extern const struct address_space_operations ceph_aops;
 788extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 789
 790/* file.c */
 791extern const struct file_operations ceph_file_fops;
 792extern const struct address_space_operations ceph_aops;
 793
 794extern int ceph_open(struct inode *inode, struct file *file);
 795extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 796                            struct file *file, unsigned flags, umode_t mode,
 797                            int *opened);
 798extern int ceph_release(struct inode *inode, struct file *filp);
 799
 800/* dir.c */
 801extern const struct file_operations ceph_dir_fops;
 802extern const struct inode_operations ceph_dir_iops;
 803extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
 804        ceph_snapdir_dentry_ops;
 805
 806extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
 807extern int ceph_handle_snapdir(struct ceph_mds_request *req,
 808                               struct dentry *dentry, int err);
 809extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 810                                         struct dentry *dentry, int err);
 811
 812extern void ceph_dentry_lru_add(struct dentry *dn);
 813extern void ceph_dentry_lru_touch(struct dentry *dn);
 814extern void ceph_dentry_lru_del(struct dentry *dn);
 815extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 816extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
 817extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);
 818
 819/*
 820 * our d_ops vary depending on whether the inode is live,
 821 * snapshotted (read-only), or a virtual ".snap" directory.
 822 */
 823int ceph_init_dentry(struct dentry *dentry);
 824
 825
 826/* ioctl.c */
 827extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 828
 829/* export.c */
 830extern const struct export_operations ceph_export_ops;
 831
 832/* locks.c */
 833extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
 834extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
 835extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
 836extern int ceph_encode_locks_to_buffer(struct inode *inode,
 837                                       struct ceph_filelock *flocks,
 838                                       int num_fcntl_locks,
 839                                       int num_flock_locks);
 840extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
 841                                  struct ceph_pagelist *pagelist,
 842                                  int num_fcntl_locks, int num_flock_locks);
 843extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
 844
 845/* debugfs.c */
 846extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
 847extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
 848
 849#endif /* _FS_CEPH_SUPER_H */
 850