#ifndef _FS_CEPH_SUPER_H
  #define _FS_CEPH_SUPER_H

  #include <linux/ceph/ceph_debug.h>

  
  #include <asm/unaligned.h>
  #include <linux/backing-dev.h>
  #include <linux/completion.h>
  #include <linux/exportfs.h>
  #include <linux/fs.h>
  #include <linux/mempool.h>
  #include <linux/pagemap.h>
  #include <linux/wait.h>

  #include <linux/writeback.h>

  #include <linux/slab.h>

  #include <linux/ceph/libceph.h>

  
  /* f_type in struct statfs */
  #define CEPH_SUPER_MAGIC 0x00c36400
  
  /* large granularity for statfs utilization stats to facilitate
   * large volume sizes on 32-bit machines. */
  #define CEPH_BLOCK_SHIFT   20  /* 1 MB */
  #define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)

  #define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
  #define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
  #define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */

  #define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */

  #define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */

  #define CEPH_MOUNT_OPT_DEFAULT    (CEPH_MOUNT_OPT_RBYTES)

  #define ceph_set_mount_opt(fsc, opt) \
  	(fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
  #define ceph_test_mount_opt(fsc, opt) \
  	(!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))

  #define CEPH_RSIZE_DEFAULT             0           /* max read size */
  #define CEPH_RASIZE_DEFAULT            (8192*1024) /* readahead */

  #define CEPH_MAX_READDIR_DEFAULT        1024
  #define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
  #define CEPH_SNAPDIRNAME_DEFAULT        ".snap"

  struct ceph_mount_options {

  	int flags;

  	int sb_flags;

  	int wsize;            /* max write size */
  	int rsize;            /* max read size */
  	int rasize;           /* max readahead */

  	int congestion_kb;    /* max writeback in flight */
  	int caps_wanted_delay_min, caps_wanted_delay_max;
  	int cap_release_safety;

  	int max_readdir;       /* max readdir result (entires) */
  	int max_readdir_bytes; /* max readdir result (bytes) */

  	/*
  	 * everything above this point can be memcmp'd; everything below
  	 * is handled in compare_mount_options()
  	 */

  	char *snapdir_name;   /* default ".snap" */
  };

  struct ceph_fs_client {

  	struct super_block *sb;

  	struct ceph_mount_options *mount_options;
  	struct ceph_client *client;

  	unsigned long mount_state;

  	int min_caps;                  /* min caps i added */

  	struct ceph_mds_client *mdsc;

  
  	/* writeback */
  	mempool_t *wb_pagevec_pool;
  	struct workqueue_struct *wb_wq;
  	struct workqueue_struct *pg_inv_wq;
  	struct workqueue_struct *trunc_wq;

  	atomic_long_t writeback_count;

  
  	struct backing_dev_info backing_dev_info;

  
  #ifdef CONFIG_DEBUG_FS

  	struct dentry *debugfs_dentry_lru, *debugfs_caps;

  	struct dentry *debugfs_congestion_kb;

  	struct dentry *debugfs_bdi;

  	struct dentry *debugfs_mdsc, *debugfs_mdsmap;

  #endif

  };

  /*
   * File i/o capability.  This tracks shared state with the metadata
   * server that allows us to cache or writeback attributes or to read
   * and write data.  For any given inode, we should have one or more
   * capabilities, one issued by each metadata server, and our
   * cumulative access is the OR of all issued capabilities.
   *
   * Each cap is referenced by the inode's i_caps rbtree and by per-mds
   * session capability lists.
   */
  struct ceph_cap {
  	struct ceph_inode_info *ci;
  	struct rb_node ci_node;          /* per-ci cap tree */
  	struct ceph_mds_session *session;
  	struct list_head session_caps;   /* per-session caplist */
  	int mds;
  	u64 cap_id;       /* unique cap id (mds provided) */
  	int issued;       /* latest, from the mds */
  	int implemented;  /* implemented superset of issued (for revocation) */
  	int mds_wanted;

  	u32 seq, issue_seq, mseq;
  	u32 cap_gen;      /* active/stale cycle */

  	unsigned long last_used;
  	struct list_head caps_item;
  };
  
  #define CHECK_CAPS_NODELAY    1  /* do not delay any further */
  #define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
  #define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
  
  /*
   * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
   * we first complete any in-process sync writes and writeback any dirty
   * data before flushing the snapped state (tracked here) back to the MDS.
   */
  struct ceph_cap_snap {
  	atomic_t nref;
  	struct ceph_inode_info *ci;
  	struct list_head ci_item, flushing_item;
  
  	u64 follows, flush_tid;
  	int issued, dirty;
  	struct ceph_snap_context *context;

  	umode_t mode;

  	uid_t uid;
  	gid_t gid;

  	struct ceph_buffer *xattr_blob;

  	u64 xattr_version;
  
  	u64 size;
  	struct timespec mtime, atime, ctime;
  	u64 time_warp_seq;
  	int writing;   /* a sync write is still in progress */
  	int dirty_pages;     /* dirty pages awaiting writeback */
  };
  
  static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
  {

  	if (atomic_dec_and_test(&capsnap->nref)) {
  		if (capsnap->xattr_blob)
  			ceph_buffer_put(capsnap->xattr_blob);

  		kfree(capsnap);

  	}

  }
  
  /*
   * The frag tree describes how a directory is fragmented, potentially across
   * multiple metadata servers.  It is also used to indicate points where
   * metadata authority is delegated, and whether/where metadata is replicated.
   *
   * A _leaf_ frag will be present in the i_fragtree IFF there is
   * delegation info.  That is, if mds >= 0 || ndist > 0.
   */
  #define CEPH_MAX_DIRFRAG_REP 4
  
  struct ceph_inode_frag {
  	struct rb_node node;
  
  	/* fragtree state */
  	u32 frag;
  	int split_by;         /* i.e. 2^(split_by) children */
  
  	/* delegation and replication info */
  	int mds;              /* -1 if same authority as parent */
  	int ndist;            /* >0 if replicated */
  	int dist[CEPH_MAX_DIRFRAG_REP];
  };
  
  /*
   * We cache inode xattrs as an encoded blob until they are first used,
   * at which point we parse them into an rbtree.
   */
  struct ceph_inode_xattr {
  	struct rb_node node;
  
  	const char *name;
  	int name_len;
  	const char *val;
  	int val_len;
  	int dirty;
  
  	int should_free_name;
  	int should_free_val;
  };

  /*
   * Ceph dentry state
   */
  struct ceph_dentry_info {

  	unsigned long flags;

  	struct ceph_mds_session *lease_session;
  	u32 lease_gen, lease_shared_gen;
  	u32 lease_seq;
  	unsigned long lease_renew_after, lease_renew_from;
  	struct list_head lru;
  	struct dentry *dentry;
  	u64 time;
  	u64 offset;
  };

  /*
   * dentry flags
   *
   * The locking for D_COMPLETE is a bit odd:
   *  - we can clear it at almost any time (see ceph_d_prune)
   *  - it is only meaningful if:

   *    - we hold dir inode i_ceph_lock

   *    - we hold dir FILE_SHARED caps
   *    - the dentry D_COMPLETE is set
   */
  #define CEPH_D_COMPLETE 1  /* if set, d_u.d_subdirs is complete directory */

  struct ceph_inode_xattrs_info {
  	/*
  	 * (still encoded) xattr blob. we avoid the overhead of parsing
  	 * this until someone actually calls getxattr, etc.
  	 *
  	 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
  	 * NULL means we don't know.
  	*/
  	struct ceph_buffer *blob, *prealloc_blob;
  
  	struct rb_root index;
  	bool dirty;
  	int count;
  	int names_size;
  	int vals_size;
  	u64 version, index_version;
  };
  
  /*
   * Ceph inode.
   */

  struct ceph_inode_info {
  	struct ceph_vino i_vino;   /* ceph ino + snap */

  	spinlock_t i_ceph_lock;

  	u64 i_version;
  	u32 i_time_warp_seq;
  
  	unsigned i_ceph_flags;
  	unsigned long i_release_count;

  	struct ceph_dir_layout i_dir_layout;

  	struct ceph_file_layout i_layout;
  	char *i_symlink;
  
  	/* for dirs */
  	struct timespec i_rctime;
  	u64 i_rbytes, i_rfiles, i_rsubdirs;
  	u64 i_files, i_subdirs;

  	u64 i_max_offset;  /* largest readdir offset, set with D_COMPLETE */

  
  	struct rb_root i_fragtree;
  	struct mutex i_fragtree_mutex;
  
  	struct ceph_inode_xattrs_info i_xattrs;

  	/* capabilities.  protected _both_ by i_ceph_lock and cap->session's

  	 * s_mutex. */
  	struct rb_root i_caps;           /* cap list */
  	struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
  	unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
  	struct list_head i_dirty_item, i_flushing_item;
  	u64 i_cap_flush_seq;
  	/* we need to track cap writeback on a per-cap-bit basis, to allow
  	 * overlapping, pipelined cap flushes to the mds.  we can probably
  	 * reduce the tid to 8 bits if we're concerned about inode size. */
  	u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
  	wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
  	unsigned long i_hold_caps_min; /* jiffies */
  	unsigned long i_hold_caps_max; /* jiffies */
  	struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
  	int i_cap_exporting_mds;         /* to handle cap migration between */
  	unsigned i_cap_exporting_mseq;   /*  mds's. */
  	unsigned i_cap_exporting_issued;
  	struct ceph_cap_reservation i_cap_migration_resv;
  	struct list_head i_cap_snaps;   /* snapped state pending flush to mds */

  	struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
  						    dirty|flushing caps */

  	unsigned i_snap_caps;           /* cap bits for snapped files */
  
  	int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
  
  	u32 i_truncate_seq;        /* last truncate to smaller size */
  	u64 i_truncate_size;       /*  and the size we last truncated down to */
  	int i_truncate_pending;    /*  still need to call vmtruncate */
  
  	u64 i_max_size;            /* max file size authorized by mds */
  	u64 i_reported_size; /* (max_)size reported to or requested of mds */
  	u64 i_wanted_max_size;     /* offset we'd like to write too */
  	u64 i_requested_max_size;  /* max_size we've requested */
  
  	/* held references to caps */
  	int i_pin_ref;

  	int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;

  	int i_wrbuffer_ref, i_wrbuffer_ref_head;
  	u32 i_shared_gen;       /* increment each time we get FILE_SHARED */

  	u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */

  	u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
  
  	struct list_head i_unsafe_writes; /* uncommitted sync writes */
  	struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
  	spinlock_t i_unsafe_lock;
  
  	struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
  	int i_snap_realm_counter; /* snap realm (if caps) */
  	struct list_head i_snap_realm_item;
  	struct list_head i_snap_flush_item;
  
  	struct work_struct i_wb_work;  /* writeback work */
  	struct work_struct i_pg_inv_work;  /* page invalidation work */
  
  	struct work_struct i_vmtruncate_work;
  
  	struct inode vfs_inode; /* at end */
  };
  
  static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
  {

  	return container_of(inode, struct ceph_inode_info, vfs_inode);

  }

  static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
  {
  	return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
  }
  
  static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
  {
  	return (struct ceph_fs_client *)sb->s_fs_info;
  }

  static inline struct ceph_vino ceph_vino(struct inode *inode)
  {
  	return ceph_inode(inode)->i_vino;
  }
  
  /*
   * ino_t is <64 bits on many architectures, blech.
   *

   *               i_ino (kernel inode)   st_ino (userspace)
   * i386          32                     32
   * x86_64+ino32  64                     32
   * x86_64        64                     64
   */

  static inline u32 ceph_ino_to_ino32(__u64 vino)

  {

  	u32 ino = vino & 0xffffffff;
  	ino ^= vino >> 32;

  	if (!ino)
  		ino = 1;
  	return ino;
  }
  
  /*
   * kernel i_ino value

   */
  static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
  {

  #if BITS_PER_LONG == 32

  	return ceph_ino_to_ino32(vino.ino);
  #else
  	return (ino_t)vino.ino;

  #endif

  }

  /*
   * user-visible ino (stat, filldir)
   */
  #if BITS_PER_LONG == 32
  static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
  {
  	return ino;
  }
  #else
  static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
  {
  	if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
  		ino = ceph_ino_to_ino32(ino);
  	return ino;
  }
  #endif

  /* for printf-style formatting */
  #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
  
  static inline u64 ceph_ino(struct inode *inode)
  {
  	return ceph_inode(inode)->i_vino.ino;
  }
  static inline u64 ceph_snap(struct inode *inode)
  {
  	return ceph_inode(inode)->i_vino.snap;
  }
  
  static inline int ceph_ino_compare(struct inode *inode, void *data)
  {
  	struct ceph_vino *pvino = (struct ceph_vino *)data;
  	struct ceph_inode_info *ci = ceph_inode(inode);
  	return ci->i_vino.ino == pvino->ino &&
  		ci->i_vino.snap == pvino->snap;
  }
  
  static inline struct inode *ceph_find_inode(struct super_block *sb,
  					    struct ceph_vino vino)
  {
  	ino_t t = ceph_vino_to_ino(vino);
  	return ilookup5(sb, t, ceph_ino_compare, &vino);
  }
  
  
  /*
   * Ceph inode.
   */

  #define CEPH_I_NODELAY   4  /* do not delay cap release */
  #define CEPH_I_FLUSH     8  /* do not delay flush of dirty metadata */
  #define CEPH_I_NOFLUSH  16  /* do not flush dirty caps */

  static inline void ceph_i_clear(struct inode *inode, unsigned mask)
  {
  	struct ceph_inode_info *ci = ceph_inode(inode);

  	spin_lock(&ci->i_ceph_lock);

  	ci->i_ceph_flags &= ~mask;

  	spin_unlock(&ci->i_ceph_lock);

  }
  
  static inline void ceph_i_set(struct inode *inode, unsigned mask)
  {
  	struct ceph_inode_info *ci = ceph_inode(inode);

  	spin_lock(&ci->i_ceph_lock);

  	ci->i_ceph_flags |= mask;

  	spin_unlock(&ci->i_ceph_lock);

  }
  
  static inline bool ceph_i_test(struct inode *inode, unsigned mask)
  {
  	struct ceph_inode_info *ci = ceph_inode(inode);
  	bool r;

  	spin_lock(&ci->i_ceph_lock);

  	r = (ci->i_ceph_flags & mask) == mask;

  	spin_unlock(&ci->i_ceph_lock);

  	return r;
  }
  
  
  /* find a specific frag @f */
  extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
  						u32 f);
  
  /*
   * choose fragment for value @v.  copy frag content to pfrag, if leaf
   * exists
   */
  extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
  			    struct ceph_inode_frag *pfrag,
  			    int *found);

  static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
  {
  	return (struct ceph_dentry_info *)dentry->d_fsdata;
  }
  
  static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
  {
  	return ((loff_t)frag << 32) | (loff_t)off;
  }

  /*

   * set/clear directory D_COMPLETE flag
   */
  void ceph_dir_set_complete(struct inode *inode);
  void ceph_dir_clear_complete(struct inode *inode);
  bool ceph_dir_test_complete(struct inode *inode);
  
  /*

   * caps helpers
   */
  static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
  {
  	return !RB_EMPTY_ROOT(&ci->i_caps);
  }
  
  extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
  extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
  extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
  				    struct ceph_cap *cap);
  
  static inline int ceph_caps_issued(struct ceph_inode_info *ci)
  {
  	int issued;

  	spin_lock(&ci->i_ceph_lock);

  	issued = __ceph_caps_issued(ci, NULL);

  	spin_unlock(&ci->i_ceph_lock);

  	return issued;
  }
  
  static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
  					int touch)
  {
  	int r;

  	spin_lock(&ci->i_ceph_lock);

  	r = __ceph_caps_issued_mask(ci, mask, touch);

  	spin_unlock(&ci->i_ceph_lock);

  	return r;
  }
  
  static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
  {
  	return ci->i_dirty_caps | ci->i_flushing_caps;
  }

  extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);

  
  extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
  extern int __ceph_caps_used(struct ceph_inode_info *ci);
  
  extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
  
  /*
   * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
   */
  static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
  {
  	int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
  	if (w & CEPH_CAP_FILE_BUFFER)
  		w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
  	return w;
  }
  
  /* what the mds thinks we want */
  extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);

  extern void ceph_caps_init(struct ceph_mds_client *mdsc);
  extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
  extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
  extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
  			     struct ceph_cap_reservation *ctx, int need);
  extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
  			       struct ceph_cap_reservation *ctx);

  extern void ceph_reservation_status(struct ceph_fs_client *client,

  				    int *total, int *avail, int *used,

  				    int *reserved, int *min);

  
  /*
   * we keep buffered readdir results attached to file->private_data
   */

  #define CEPH_F_SYNC     1

  #define CEPH_F_ATEND    2

  struct ceph_file_info {

  	short fmode;     /* initialized on open */
  	short flags;     /* CEPH_F_* */

  
  	/* readdir: position within the dir */
  	u32 frag;
  	struct ceph_mds_request *last_readdir;

  
  	/* readdir: position within a frag */
  	unsigned offset;       /* offset of last chunk, adjusted for . and .. */
  	u64 next_offset;       /* offset of next chunk (last_name's + 1) */
  	char *last_name;       /* last entry in previous chunk */
  	struct dentry *dentry; /* next dentry (for dcache readdir) */
  	unsigned long dir_release_count;
  
  	/* used for -o dirstat read() on directory thing */
  	char *dir_info;
  	int dir_info_len;
  };
  
  
  
  /*

   * A "snap realm" describes a subset of the file hierarchy sharing
   * the same set of snapshots that apply to it.  The realms themselves
   * are organized into a hierarchy, such that children inherit (some of)
   * the snapshots of their parents.
   *
   * All inodes within the realm that have capabilities are linked into a
   * per-realm list.
   */
  struct ceph_snap_realm {
  	u64 ino;
  	atomic_t nref;

  	struct rb_node node;

  	u64 created, seq;
  	u64 parent_ino;
  	u64 parent_since;   /* snapid when our current parent became so */
  
  	u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
  	int num_prior_parent_snaps;   /*  had prior to parent_since */
  	u64 *snaps;                   /* snaps specific to this realm */
  	int num_snaps;
  
  	struct ceph_snap_realm *parent;
  	struct list_head children;       /* list of child realms */
  	struct list_head child_item;
  
  	struct list_head empty_item;     /* if i have ref==0 */

  	struct list_head dirty_item;     /* if realm needs new context */

  	/* the current set of snaps for this realm */
  	struct ceph_snap_context *cached_context;
  
  	struct list_head inodes_with_caps;
  	spinlock_t inodes_with_caps_lock;
  };

  static inline int default_congestion_kb(void)

  {

  	int congestion_kb;
  
  	/*
  	 * Copied from NFS
  	 *
  	 * congestion size, scale with available memory.
  	 *
  	 *  64MB:    8192k
  	 * 128MB:   11585k
  	 * 256MB:   16384k
  	 * 512MB:   23170k
  	 *   1GB:   32768k
  	 *   2GB:   46340k
  	 *   4GB:   65536k
  	 *   8GB:   92681k
  	 *  16GB:  131072k
  	 *
  	 * This allows larger machines to have larger/more transfers.
  	 * Limit the default to 256M
  	 */
  	congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
  	if (congestion_kb > 256*1024)
  		congestion_kb = 256*1024;
  
  	return congestion_kb;

  }
  
  
  
  /* snap.c */
  struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
  					       u64 ino);
  extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
  				struct ceph_snap_realm *realm);
  extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
  				struct ceph_snap_realm *realm);
  extern int ceph_update_snap_trace(struct ceph_mds_client *m,
  				  void *p, void *e, bool deletion);
  extern void ceph_handle_snap(struct ceph_mds_client *mdsc,

  			     struct ceph_mds_session *session,

  			     struct ceph_msg *msg);

  extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);

  extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
  				  struct ceph_cap_snap *capsnap);
  extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
  
  /*
   * a cap_snap is "pending" if it is still awaiting an in-progress
   * sync write (that may/may not still update size, mtime, etc.).
   */
  static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
  {
  	return !list_empty(&ci->i_cap_snaps) &&
  		list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
  			   ci_item)->writing;
  }

  /* inode.c */
  extern const struct inode_operations ceph_file_iops;
  
  extern struct inode *ceph_alloc_inode(struct super_block *sb);
  extern void ceph_destroy_inode(struct inode *inode);
  
  extern struct inode *ceph_get_inode(struct super_block *sb,
  				    struct ceph_vino vino);
  extern struct inode *ceph_get_snapdir(struct inode *parent);
  extern int ceph_fill_file_size(struct inode *inode, int issued,
  			       u32 truncate_seq, u64 truncate_size, u64 size);
  extern void ceph_fill_file_time(struct inode *inode, int issued,
  				u64 time_warp_seq, struct timespec *ctime,
  				struct timespec *mtime, struct timespec *atime);
  extern int ceph_fill_trace(struct super_block *sb,
  			   struct ceph_mds_request *req,
  			   struct ceph_mds_session *session);
  extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
  				    struct ceph_mds_session *session);
  
  extern int ceph_inode_holds_cap(struct inode *inode, int mask);
  
  extern int ceph_inode_set_size(struct inode *inode, loff_t size);

  extern void __ceph_do_pending_vmtruncate(struct inode *inode);

  extern void ceph_queue_vmtruncate(struct inode *inode);
  
  extern void ceph_queue_invalidate(struct inode *inode);
  extern void ceph_queue_writeback(struct inode *inode);

  
  extern int ceph_do_getattr(struct inode *inode, int mask);

  extern int ceph_permission(struct inode *inode, int mask);

  extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
  extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
  			struct kstat *stat);
  
  /* xattr.c */
  extern int ceph_setxattr(struct dentry *, const char *, const void *,
  			 size_t, int);
  extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
  extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
  extern int ceph_removexattr(struct dentry *, const char *);
  extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
  extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
  
  /* caps.c */
  extern const char *ceph_cap_string(int c);
  extern void ceph_handle_caps(struct ceph_mds_session *session,
  			     struct ceph_msg *msg);
  extern int ceph_add_cap(struct inode *inode,
  			struct ceph_mds_session *session, u64 cap_id,
  			int fmode, unsigned issued, unsigned wanted,
  			unsigned cap, unsigned seq, u64 realmino, int flags,
  			struct ceph_cap_reservation *caps_reservation);

  extern void __ceph_remove_cap(struct ceph_cap *cap);

  static inline void ceph_remove_cap(struct ceph_cap *cap)
  {

  	spin_lock(&cap->ci->i_ceph_lock);

  	__ceph_remove_cap(cap);

  	spin_unlock(&cap->ci->i_ceph_lock);

  }

  extern void ceph_put_cap(struct ceph_mds_client *mdsc,
  			 struct ceph_cap *cap);

  
  extern void ceph_queue_caps_release(struct inode *inode);

  extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);

  extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
  		      int datasync);

  extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
  				    struct ceph_mds_session *session);

  extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
  					     int mds);

  extern int ceph_get_cap_mds(struct inode *inode);
  extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
  extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
  extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
  				       struct ceph_snap_context *snapc);
  extern void __ceph_flush_snaps(struct ceph_inode_info *ci,

  			       struct ceph_mds_session **psession,
  			       int again);

  extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
  			    struct ceph_mds_session *session);

  extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
  extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);

  
  extern int ceph_encode_inode_release(void **p, struct inode *inode,
  				     int mds, int drop, int unless, int force);
  extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
  				      int mds, int drop, int unless);
  
  extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
  			 int *got, loff_t endoff);
  
  /* for counting open files by mode */
  static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
  {
  	ci->i_nr_by_mode[mode]++;
  }
  extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
  
  /* addr.c */
  extern const struct address_space_operations ceph_aops;
  extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
  
  /* file.c */
  extern const struct file_operations ceph_file_fops;
  extern const struct address_space_operations ceph_aops;

  extern int ceph_copy_to_page_vector(struct page **pages,
  				    const char *data,
  				    loff_t off, size_t len);
  extern int ceph_copy_from_page_vector(struct page **pages,
  				    char *data,
  				    loff_t off, size_t len);
  extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);

  extern int ceph_open(struct inode *inode, struct file *file);
  extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
  				       struct nameidata *nd, int mode,
  				       int locked_dir);
  extern int ceph_release(struct inode *inode, struct file *filp);

  
  /* dir.c */
  extern const struct file_operations ceph_dir_fops;
  extern const struct inode_operations ceph_dir_iops;

  extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,

  	ceph_snapdir_dentry_ops;
  
  extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);

  extern int ceph_handle_snapdir(struct ceph_mds_request *req,
  			       struct dentry *dentry, int err);

  extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
  					 struct dentry *dentry, int err);
  
  extern void ceph_dentry_lru_add(struct dentry *dn);
  extern void ceph_dentry_lru_touch(struct dentry *dn);
  extern void ceph_dentry_lru_del(struct dentry *dn);

  extern void ceph_invalidate_dentry_lease(struct dentry *dentry);

  extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);

  extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);

  
  /*
   * our d_ops vary depending on whether the inode is live,
   * snapshotted (read-only), or a virtual ".snap" directory.
   */
  int ceph_init_dentry(struct dentry *dentry);
  
  
  /* ioctl.c */
  extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  
  /* export.c */
  extern const struct export_operations ceph_export_ops;

  /* locks.c */
  extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
  extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
  extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
  extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p,
  			     int p_locks, int f_locks);
  extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);

  /* debugfs.c */
  extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
  extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);

  #endif /* _FS_CEPH_SUPER_H */