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linux/fs/ceph/super.h
Sage Weil e835124c2b ceph: only send one flushsnap per cap_snap per mds session 
Sending multiple flushsnap messages is problematic because we ignore
the response if the tid doesn't match, and the server may only respond to
each one once.  It's also a waste.

So, skip cap_snaps that are already on the flushing list, unless the caller
tells us to resend (because we are reconnecting).

Signed-off-by: Sage Weil <sage@newdream.net>
2010-09-17 08:03:08 -07:00

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#ifndef _FS_CEPH_SUPER_H
#define _FS_CEPH_SUPER_H
#include "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 "types.h"
#include "messenger.h"
#include "msgpool.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)
/*
* Supported features
*/
#define CEPH_FEATURE_SUPPORTED CEPH_FEATURE_NOSRCADDR | CEPH_FEATURE_FLOCK
#define CEPH_FEATURE_REQUIRED CEPH_FEATURE_NOSRCADDR
/*
* mount options
*/
#define CEPH_OPT_FSID (1<<0)
#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
#define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */
#define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
#define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */
#define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
#define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES)
#define ceph_set_opt(client, opt) \
(client)->mount_args->flags |= CEPH_OPT_##opt;
#define ceph_test_opt(client, opt) \
(!!((client)->mount_args->flags & CEPH_OPT_##opt))
struct ceph_mount_args {
int sb_flags;
int flags;
struct ceph_fsid fsid;
struct ceph_entity_addr my_addr;
int num_mon;
struct ceph_entity_addr *mon_addr;
int mount_timeout;
int osd_idle_ttl;
int osd_timeout;
int osd_keepalive_timeout;
int wsize;
int rsize; /* 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) */
char *snapdir_name; /* default ".snap" */
char *name;
char *secret;
};
/*
* defaults
*/
#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
#define CEPH_OSD_KEEPALIVE_DEFAULT 5
#define CEPH_OSD_IDLE_TTL_DEFAULT 60
#define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */
#define CEPH_MAX_READDIR_DEFAULT 1024
#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
#define CEPH_AUTH_NAME_DEFAULT "guest"
/*
* Delay telling the MDS we no longer want caps, in case we reopen
* the file. Delay a minimum amount of time, even if we send a cap
* message for some other reason. Otherwise, take the oppotunity to
* update the mds to avoid sending another message later.
*/
#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
/* mount state */
enum {
CEPH_MOUNT_MOUNTING,
CEPH_MOUNT_MOUNTED,
CEPH_MOUNT_UNMOUNTING,
CEPH_MOUNT_UNMOUNTED,
CEPH_MOUNT_SHUTDOWN,
};
/*
* 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;
}
/*
* per-filesystem client state
*
* possibly shared by multiple mount points, if they are
* mounting the same ceph filesystem/cluster.
*/
struct ceph_client {
struct ceph_fsid fsid;
bool have_fsid;
struct mutex mount_mutex; /* serialize mount attempts */
struct ceph_mount_args *mount_args;
struct super_block *sb;
unsigned long mount_state;
wait_queue_head_t auth_wq;
int auth_err;
int min_caps; /* min caps i added */
struct ceph_messenger *msgr; /* messenger instance */
struct ceph_mon_client monc;
struct ceph_mds_client mdsc;
struct ceph_osd_client osdc;
/* 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_monmap;
struct dentry *debugfs_mdsmap, *debugfs_osdmap;
struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
struct dentry *debugfs_congestion_kb;
struct dentry *debugfs_bdi;
#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;
mode_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;
};
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.
*/
#define CEPH_I_COMPLETE 1 /* we have complete directory cached */
#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 */
struct ceph_inode_info {
struct ceph_vino i_vino; /* ceph ino + snap */
u64 i_version;
u32 i_time_warp_seq;
unsigned i_ceph_flags;
unsigned long i_release_count;
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 I_COMPLETE */
struct rb_root i_fragtree;
struct mutex i_fragtree_mutex;
struct ceph_inode_xattrs_info i_xattrs;
/* capabilities. protected _both_ by i_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;
int i_wrbuffer_ref, i_wrbuffer_ref_head;
u32 i_shared_gen; /* increment each time we get FILE_SHARED */
u32 i_rdcache_gen; /* we increment this each time we get
FILE_CACHE. If it's non-zero, we
_may_ have cached pages. */
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 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;
smp_mb();
r = (ci->i_ceph_flags & mask) == mask;
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);
/*
* Ceph dentry state
*/
struct ceph_dentry_info {
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;
};
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;
}
/*
* ino_t is <64 bits on many architectures, blech.
*
* don't include snap in ino hash, at least 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;
if (!ino)
ino = 1;
#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
*/
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->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,
int touch)
{
int r;
spin_lock(&ci->vfs_inode.i_lock);
r = __ceph_caps_issued_mask(ci, mask, touch);
spin_unlock(&ci->vfs_inode.i_lock);
return r;
}
static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
{
return ci->i_dirty_caps | ci->i_flushing_caps;
}
extern void __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_client *client,
int *total, int *avail, int *used,
int *reserved, int *min);
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;
}
/*
* we keep buffered readdir results attached to file->private_data
*/
struct ceph_file_info {
int fmode; /* initialized on open */
/* readdir: position within the dir */
u32 frag;
struct ceph_mds_request *last_readdir;
int at_end;
/* 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;
};
/*
* 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;
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;
};
/*
* 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_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;
}
/* super.c */
extern struct kmem_cache *ceph_inode_cachep;
extern struct kmem_cache *ceph_cap_cachep;
extern struct kmem_cache *ceph_dentry_cachep;
extern struct kmem_cache *ceph_file_cachep;
extern const char *ceph_msg_type_name(int type);
extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
/* 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)
{
struct inode *inode = &cap->ci->vfs_inode;
spin_lock(&inode->i_lock);
__ceph_remove_cap(cap);
spin_unlock(&inode->i_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, 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_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);
extern void ceph_release_page_vector(struct page **pages, int num_pages);
/* 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 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);
/*
* 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;
/* debugfs.c */
extern int ceph_debugfs_init(void);
extern void ceph_debugfs_cleanup(void);
extern int ceph_debugfs_client_init(struct ceph_client *client);
extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
/* 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);
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 */
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