super.h

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#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 = 2;
    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 */
    u32 num_prior_parent_snaps;   /*  had prior to parent_since */
    u64 *snaps;                   /* snaps specific to this realm */
    u32 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);
extern void __init ceph_xattr_init(void);
extern void ceph_xattr_exit(void);

/* 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 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
                struct file *file, unsigned flags, umode_t mode,
                int *opened);
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 */