path: root/src/kernel/super.h

#ifndef _FS_CEPH_SUPER_H
#define _FS_CEPH_SUPER_H

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

#include "types.h"
#include "ceph_debug.h"
#include "messenger.h"
#include "mon_client.h"
#include "mds_client.h"
#include "osd_client.h"
#include "ceph_fs.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_TIMEOUT  (60*HZ)
#define CEPH_CAP_DELAY      (5*HZ)  /* cap release delay */

/*
 * subtract jiffies
 */
static inline unsigned long time_sub(unsigned long a, unsigned long b)
{
	BUG_ON(time_after(b, a));
	return (long)a - (long)b;
}

/*
 * mount options
 */
#define CEPH_MOUNT_FSID          (1<<0)
#define CEPH_MOUNT_NOSHARE       (1<<1) /* don't share client with other sbs */
#define CEPH_MOUNT_MYIP          (1<<2) /* specified my ip */
#define CEPH_MOUNT_UNSAFE_WRITEBACK (1<<3)
#define CEPH_MOUNT_DIRSTAT       (1<<4) /* funky `cat dirname` for stats */
#define CEPH_MOUNT_RBYTES        (1<<5) /* dir st_bytes = rbytes */
#define CEPH_MOUNT_NOCRC         (1<<6) /* no data crc on writes */

#define CEPH_MOUNT_DEFAULT   (CEPH_MOUNT_RBYTES)

#define CEPH_DEFAULT_READ_SIZE	(128*1024) /* readahead */

#define MAX_MON_MOUNT_ADDR	5
#define CEPH_MSG_MAX_FRONT_LEN	(16*1024*1024)
#define CEPH_MSG_MAX_DATA_LEN	(16*1024*1024)

struct ceph_mount_args {
	int sb_flags;
	int flags;
	int mount_timeout;
	ceph_fsid_t fsid;
	struct ceph_entity_addr my_addr;
	int num_mon;
	struct ceph_entity_addr mon_addr[MAX_MON_MOUNT_ADDR];
	int wsize;
	int rsize;            /* max readahead */
	int osd_timeout;
	char *snapdir_name;   /* default ".snap" */
};

enum {
	CEPH_MOUNT_MOUNTING,
	CEPH_MOUNT_MOUNTED,
	CEPH_MOUNT_UNMOUNTING,
	CEPH_MOUNT_UNMOUNTED,
	CEPH_MOUNT_SHUTDOWN,
};

struct ceph_client_attr {
	struct attribute attr;
	ssize_t (*show)(struct ceph_client *, struct ceph_client_attr *,
			char *);
	ssize_t (*store)(struct ceph_client *, struct ceph_client_attr *,
			 const char *, size_t);
};

/*
 * per-filesystem client state
 *
 * possibly shared by multiple mount points, if they are
 * mounting the same ceph filesystem/cluster.
 */
struct ceph_client {
	u32 whoami;                   /* my client number */
	struct kobject kobj;
	struct ceph_client_attr k_fsid, k_monmap, k_mdsmap, k_osdmap;

	struct mutex mount_mutex;       /* serialize mount attempts */
	struct ceph_mount_args mount_args;
	ceph_fsid_t fsid;

	struct super_block *sb;

	unsigned long mount_state;
	wait_queue_head_t mount_wq;

	struct ceph_messenger *msgr;   /* messenger instance */
	struct ceph_mon_client monc;
	struct ceph_mds_client mdsc;
	struct ceph_osd_client osdc;

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

	struct backing_dev_info backing_dev_info;
};

static inline struct ceph_client *ceph_client(struct super_block *sb)
{
	return sb->s_fs_info;
}

/*
 * File i/o capability.  This tracks shared state with the metadata
 * server that allows us to read and write data to this file.  For any
 * given inode, we may have multiple 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 tree and by a per-mds
 * session capability list(s).
 */
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 */
	struct list_head session_rdcaps; /* per-session rdonly caps */
	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 flushing;     /* dirty fields being written back to mds */
	int mds_wanted;
	u32 seq, mseq, gen;
	unsigned long expires;  /* if readonly and unwanted (jiffies) */
};

/*
 * 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 list_head ci_item;
	u64 follows;
	int issued, dirty;
	struct ceph_snap_context *context;
	
	mode_t mode;
	uid_t uid;
	gid_t gid;

	void *xattr_blob;
	int xattr_len;
	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))
		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 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 info */
	int mds;              /* -1 if same authority as parent */
	int ndist;            /* >0 if replicated */
	int dist[MAX_DIRFRAG_REP];
};


/*
 * Ceph inode.
 */
#define CEPH_I_COMPLETE  1  /* we have complete directory cached */
#define CEPH_I_READDIR   2  /* no dentries trimmed since readdir start */

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

	u64 i_version;
	u32 i_time_warp_seq;

	unsigned i_ceph_flags;

	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;


	struct rb_root i_fragtree;
	struct mutex i_fragtree_mutex;

	/*
	 * (still encoded) xattr blob. we avoid the overhead of parsing
	 * this until someone actually calls getxattr, etc.
	 *
	 * if i_xattr_len == 0 or 4, i_xattr_data == NULL.
	 * i_xattr_len == 4 implies there are no xattrs; 0 means we
	 * don't know.
	 */
	int i_xattr_len;
	char *i_xattr_data;
	u64 i_xattr_version;

	/* capabilities.  protected _both_ by i_lock and cap->session's
	 * s_mutex. */
	struct rb_root i_caps;           /* cap list */
	unsigned i_dirty_caps;           /* mask of dirtied fields */
	wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
	unsigned long i_hold_caps_until; /* 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 list_head i_cap_snaps;   /* snapped state pending flush to mds */
	struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 */
	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 */

	struct timespec i_old_atime;

	/* held references to caps */
	int i_rd_ref, i_rdcache_ref, i_wr_ref;
	int i_wrbuffer_ref, i_wrbuffer_ref_head;
	u32 i_rdcache_gen;      /* we increment this each time we get RDCACHE.
				   If it's non-zero, we _may_ have cached
				   pages. */
	u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */

	struct ceph_snap_realm *i_snap_realm; /* 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 list_head i_listener_list; /* requests we pend on */
	spinlock_t i_listener_lock;

	struct inode vfs_inode; /* at end */
};

static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
{
	return list_entry(inode, struct ceph_inode_info, vfs_inode);
}

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

	spin_lock(&inode->i_lock);
	ci->i_ceph_flags &= ~mask;
	spin_unlock(&inode->i_lock);
}

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

	spin_lock(&inode->i_lock);
	ci->i_ceph_flags |= mask;
	spin_unlock(&inode->i_lock);
}

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

	spin_lock(&inode->i_lock);
	r = (ci->i_ceph_flags & mask) == mask;
	spin_unlock(&inode->i_lock);
	return r;
}


/* find a specific frag @f */
static inline struct ceph_inode_frag *
__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
{
	struct rb_node *n = ci->i_fragtree.rb_node;

	while (n) {
		struct ceph_inode_frag *frag =
			rb_entry(n, struct ceph_inode_frag, node);
		int c = frag_compare(f, frag->frag);
		if (c < 0)
			n = n->rb_left;
		else if (c > 0)
			n = n->rb_right;
		else
			return frag;
	}
	return NULL;
}

/*
 * 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);

/*
 * Ceph dentry state
 */
struct ceph_dentry_info {
	struct ceph_mds_session *lease_session;
	u32 lease_gen;
	u32 lease_seq;
	unsigned long lease_renew_after;
};

static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
{
	return (struct ceph_dentry_info *)dentry->d_fsdata;
}


/*
 * ino_t is <64 bits on many architectures, blech.
 *
 * don't include snap in ino hash, at leaset for now.
 */
static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
{
	ino_t ino = (ino_t)vino.ino;  /* ^ (vino.snap << 20); */
#if BITS_PER_LONG == 32
	ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
#endif
	return ino;
}

static inline int ceph_set_ino_cb(struct inode *inode, void *data)
{
	ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
	inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
	return 0;
}

static inline struct ceph_vino ceph_vino(struct inode *inode)
{
	return ceph_inode(inode)->i_vino;
}

/* 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);
}


/*
 * caps helpers
 */
extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);

static inline int ceph_caps_issued(struct ceph_inode_info *ci)
{
	int issued;
	spin_lock(&ci->vfs_inode.i_lock);
	issued = __ceph_caps_issued(ci, NULL);
	spin_unlock(&ci->vfs_inode.i_lock);
	return issued;
}

static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask)
{
	return (ceph_caps_issued(ci) & mask);
}

extern int __ceph_caps_dirty(struct ceph_inode_info *ci);
extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);

static inline int __ceph_caps_used(struct ceph_inode_info *ci)
{
	int used = 0;
	if (ci->i_rd_ref)
		used |= CEPH_CAP_GRD;
	if (ci->i_rdcache_ref || ci->i_rdcache_gen)
		used |= CEPH_CAP_GRDCACHE;
	if (ci->i_wr_ref)
		used |= CEPH_CAP_GWR;
	if (ci->i_wrbuffer_ref)
		used |= CEPH_CAP_GWRBUFFER;
	return CEPH_CAP_FILE(used);
}

/*
 * wanted, by virtue of open file modes
 */
static inline int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
{
	int want = 0;
	int mode;
	for (mode = 0; mode < 4; mode++)
		if (ci->i_nr_by_mode[mode])
			want |= ceph_caps_for_mode(mode);
	return want;
}

/*
 * wanted, by virtual 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_WRBUFFER)
		w |= (CEPH_CAP_FILE_EXCL);  /* we want EXCL if dirty data */
	return w;
}

static inline struct ceph_client *ceph_inode_to_client(struct inode *inode)
{
	return (struct ceph_client *)inode->i_sb->s_fs_info;
}

static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb)
{
	return (struct ceph_client *)sb->s_fs_info;
}

static inline int ceph_queue_writeback(struct inode *inode)
{
	return queue_work(ceph_inode_to_client(inode)->wb_wq,
		   &ceph_inode(inode)->i_wb_work);
}

static inline int ceph_queue_page_invalidation(struct inode *inode)
{
	return queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
		   &ceph_inode(inode)->i_pg_inv_work);
}


/*
 * keep readdir buffers attached to file->private_data
 */
struct ceph_file_info {
	int fmode;     /* initialized on open */
	u32 frag;      /* one frag at a time; screw seek_dir() on large dirs */
	struct ceph_mds_request *last_readdir;

	/* used for -o dirstat read() on directory thing */
	char *dir_info;
	int dir_info_len;
};



/*
 * snapshots
 */

/*
 * A "snap context" is the set of existing snapshots when we
 * write data.  It is used by the OSD to guide its COW behavior.
 *
 * The ceph_snap_context is refcounted, and attached to each dirty
 * page, indicating which context the dirty data belonged when it was
 * dirtied.
 */
struct ceph_snap_context {
	atomic_t nref;
	u64 seq;
	int num_snaps;
	u64 snaps[];
};

static inline struct ceph_snap_context *
ceph_get_snap_context(struct ceph_snap_context *sc)
{
	/*
	printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
	       atomic_read(&sc->nref)+1);
	*/
	if (sc)
		atomic_inc(&sc->nref);
	return sc;
}

static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
{
	if (!sc)
		return;
	/*
	printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
	       atomic_read(&sc->nref)-1);
	*/
	if (atomic_dec_and_test(&sc->nref)) {
		/*printk(" deleting snap_context %p\n", sc);*/
		kfree(sc);
	}
}

/*
 * 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;
	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 */

	/* the current set of snaps for this realm */
	struct ceph_snap_context *cached_context;

	struct list_head inodes_with_caps;
};



/*
 * calculate the number of pages a given length and offset map onto,
 * if we align the data.
 */
static inline int calc_pages_for(u64 off, u64 len)
{
	return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
		(off >> PAGE_CACHE_SHIFT);
}



/* 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_msg *msg);
extern void ceph_queue_cap_snap(struct ceph_inode_info *ci,
				struct ceph_snap_context *snapc);
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;
}


/* super.c */
extern const char *ceph_msg_type_name(int type);

static inline __le64 __ceph_fsid_minor(ceph_fsid_t *fsid)
{
	return *(__le64 *)&fsid->fsid[8];
}

static inline __le64 __ceph_fsid_major(ceph_fsid_t *fsid)
{
	return *(__le64 *)&fsid->fsid[0];
}

static inline void __ceph_fsid_set_minor(ceph_fsid_t *fsid, __le64 val)
{
	*(__le64 *)&fsid->fsid[8] = val;
}

static inline void __ceph_fsid_set_major(ceph_fsid_t *fsid, __le64 val)
{
	*(__le64 *)&fsid->fsid[0] = val;
}

/* inode.c */
extern const struct inode_operations ceph_file_iops;
extern struct kmem_cache *ceph_inode_cachep;

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 void ceph_inode_set_size(struct inode *inode, loff_t size);
extern void ceph_inode_writeback(struct work_struct *work);
extern void ceph_vmtruncate_work(struct work_struct *work);
extern void __ceph_do_pending_vmtruncate(struct inode *inode);

extern int ceph_do_getattr(struct dentry *dentry, 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);
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 *);

/* caps.c */
extern const char *ceph_cap_string(int c);
extern void ceph_handle_caps(struct ceph_mds_client *mdsc,
			     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,
			unsigned ttl_ms, unsigned long ttl_from,
			struct ceph_cap *new_cap);
extern void ceph_remove_cap(struct ceph_cap *cap);
extern int ceph_get_cap_mds(struct inode *inode);
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);
extern void ceph_check_caps(struct ceph_inode_info *ci, int delayed, int drop,
			    struct ceph_mds_session *session);
extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
void ceph_trim_session_rdcaps(struct ceph_mds_session *session);

static inline void ceph_release_caps(struct inode *inode, int mask)
{
	ceph_check_caps(ceph_inode(inode), 1, mask, NULL);
}

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_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 struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
	ceph_snapdir_dentry_ops;

extern struct dentry *ceph_do_lookup(struct super_block *sb,
				     struct dentry *dentry,
				     int mask, int on_inode, int locked_dir);
extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
					 struct dentry *dentry, int err);

/*
 * our d_ops vary depending on whether the inode is live,
 * snapshotted (read-only), or a virtual ".snap" directory.
 */
static inline void ceph_init_dentry(struct dentry *dentry)
{
	if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
		dentry->d_op = &ceph_dentry_ops;
	else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
		dentry->d_op = &ceph_snapdir_dentry_ops;
	else
		dentry->d_op = &ceph_snap_dentry_ops;
	dentry->d_time = 0;
}

/* 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;

/* sysfs.c */
extern int ceph_sysfs_client_init(struct ceph_client *client);
extern void ceph_sysfs_client_cleanup(struct ceph_client *client);
extern int ceph_sysfs_init(void);
extern void ceph_sysfs_cleanup(void);
extern int ceph_sysfs_mds_req_init(struct ceph_mds_client *mdsc, struct ceph_mds_request *req);
extern void ceph_sysfs_mds_req_cleanup(struct ceph_mds_request *req);
extern int ceph_sysfs_osd_req_init(struct ceph_osd_client *osdc, struct ceph_osd_request *req);
extern void ceph_sysfs_osd_req_cleanup(struct ceph_osd_request *req);
extern int ceph_sysfs_mon_statfs_req_init(struct ceph_mon_client *monc, struct ceph_mon_statfs_request *req,
					  struct ceph_msg *msg);
extern void ceph_sysfs_mon_statfs_req_cleanup(struct ceph_mon_statfs_request *req);


static inline struct inode *get_dentry_parent_inode(struct dentry *dentry)
{
	if (dentry && dentry->d_parent)
		return dentry->d_parent->d_inode;

	return NULL;
}

#endif /* _FS_CEPH_SUPER_H */