| #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 |
| #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; |
| |
| 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 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 */ |
| 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 */ |
| |
| /* 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); |
| 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 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); |
| |
| 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 */ |