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 /* SPDX-License-Identifier: GPL-2.0 */
 #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/posix_acl.h>
 #include <linux/refcount.h>
 #include <linux/security.h>
 #include <linux/netfs.h>
 #include <linux/fscache.h>
 #include <linux/hashtable.h>
 
 #include <linux/ceph/libceph.h>
 
 /* large granularity for statfs utilization stats to facilitate
  * large volume sizes on 32-bit machines. */
 #define CEPH_BLOCK_SHIFT   22  /* 4 MB */
 #define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
 #define CEPH_4K_BLOCK_SHIFT 12  /* 4 KB */
 
 #define CEPH_MOUNT_OPT_CLEANRECOVER    (1<<1) /* auto reonnect (clean mode) after blocklisted */
 #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_FSCACHE         (1<<10) /* use fscache */
 #define CEPH_MOUNT_OPT_NOPOOLPERM      (1<<11) /* no pool permission check */
 #define CEPH_MOUNT_OPT_MOUNTWAIT       (1<<12) /* mount waits if no mds is up */
 #define CEPH_MOUNT_OPT_NOQUOTADF       (1<<13) /* no root dir quota in statfs */
 #define CEPH_MOUNT_OPT_NOCOPYFROM      (1<<14) /* don't use RADOS 'copy-from' op */
 #define CEPH_MOUNT_OPT_ASYNC_DIROPS    (1<<15) /* allow async directory ops */
 #define CEPH_MOUNT_OPT_NOPAGECACHE     (1<<16) /* bypass pagecache altogether */
 
 #define CEPH_MOUNT_OPT_DEFAULT          \
     (CEPH_MOUNT_OPT_DCACHE |        \
      CEPH_MOUNT_OPT_NOCOPYFROM |        \
      CEPH_MOUNT_OPT_ASYNC_DIROPS)
 
 #define ceph_set_mount_opt(fsc, opt) \
     (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt
 #define ceph_clear_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))
 
 /* max size of osd read request, limited by libceph */
 #define CEPH_MAX_READ_SIZE              CEPH_MSG_MAX_DATA_LEN
 /* osd has a configurable limitaion of max write size.
  * CEPH_MSG_MAX_DATA_LEN should be small enough. */
 #define CEPH_MAX_WRITE_SIZE     CEPH_MSG_MAX_DATA_LEN
 #define CEPH_RASIZE_DEFAULT             (8192*1024)    /* max readahead */
 #define CEPH_MAX_READDIR_DEFAULT        1024
 #define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
 #define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
 
 /*
  * 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 */
 
 struct ceph_mount_options {
     unsigned int flags;
 
     unsigned int wsize;            /* max write size */
     unsigned int rsize;            /* max read size */
     unsigned int rasize;           /* max readahead */
     unsigned int congestion_kb;    /* max writeback in flight */
     unsigned int caps_wanted_delay_min, caps_wanted_delay_max;
     int caps_max;
     unsigned int max_readdir;       /* max readdir result (entries) */
     unsigned int max_readdir_bytes; /* max readdir result (bytes) */
 
     bool new_dev_syntax;
 
     /*
      * everything above this point can be memcmp'd; everything below
      * is handled in compare_mount_options()
      */
 
     char *snapdir_name;   /* default ".snap" */
     char *mds_namespace;  /* default NULL */
     char *server_path;    /* default NULL (means "/") */
     char *fscache_uniq;   /* default NULL */
     char *mon_addr;
 };
 
 #define CEPH_ASYNC_CREATE_CONFLICT_BITS 8
 
 struct ceph_fs_client {
     struct super_block *sb;
 
     struct list_head metric_wakeup;
 
     struct ceph_mount_options *mount_options;
     struct ceph_client *client;
 
     int mount_state;
 
     bool blocklisted;
 
     bool have_copy_from2;
 
     u32 filp_gen;
     loff_t max_file_size;
 
     struct ceph_mds_client *mdsc;
 
     atomic_long_t writeback_count;
     bool write_congested;
 
     struct workqueue_struct *inode_wq;
     struct workqueue_struct *cap_wq;
 
     DECLARE_HASHTABLE(async_unlink_conflict, CEPH_ASYNC_CREATE_CONFLICT_BITS);
     spinlock_t async_unlink_conflict_lock;
 
 #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;
     struct dentry *debugfs_status;
     struct dentry *debugfs_mds_sessions;
     struct dentry *debugfs_metrics_dir;
 #endif
 
 #ifdef CONFIG_CEPH_FSCACHE
     struct fscache_volume *fscache;
 #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 */
     u64 cap_id;       /* unique cap id (mds provided) */
     union {
         /* in-use caps */
         struct {
             int issued;       /* latest, from the mds */
             int implemented;  /* implemented superset of
                          issued (for revocation) */
             int mds;      /* mds index for this cap */
             int mds_wanted;   /* caps wanted from this mds */
         };
         /* caps to release */
         struct {
             u64 cap_ino;
             int queue_release;
         };
     };
     u32 seq, issue_seq, mseq;
     u32 cap_gen;      /* active/stale cycle */
     unsigned long last_used;
     struct list_head caps_item;
 };
 
 #define CHECK_CAPS_AUTHONLY   1  /* only check auth cap */
 #define CHECK_CAPS_FLUSH      2  /* flush any dirty caps */
 #define CHECK_CAPS_NOINVAL    4  /* don't invalidate pagecache */
 
 struct ceph_cap_flush {
     u64 tid;
     int caps;
     bool wake; /* wake up flush waiters when finish ? */
     bool is_capsnap; /* true means capsnap */
     struct list_head g_list; // global
     struct list_head i_list; // per inode
 };
 
 /*
  * 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 {
     refcount_t nref;
     struct list_head ci_item;
 
     struct ceph_cap_flush cap_flush;
 
     u64 follows;
     int issued, dirty;
     struct ceph_snap_context *context;
 
     umode_t mode;
     kuid_t uid;
     kgid_t gid;
 
     struct ceph_buffer *xattr_blob;
     u64 xattr_version;
 
     u64 size;
     u64 change_attr;
     struct timespec64 mtime, atime, ctime, btime;
     u64 time_warp_seq;
     u64 truncate_size;
     u32 truncate_seq;
     int writing;   /* a sync write is still in progress */
     int dirty_pages;     /* dirty pages awaiting writeback */
     bool inline_data;
     bool need_flush;
 };
 
 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
 {
     if (refcount_dec_and_test(&capsnap->nref)) {
         if (capsnap->xattr_blob)
             ceph_buffer_put(capsnap->xattr_blob);
         kmem_cache_free(ceph_cap_snap_cachep, 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 {
     struct dentry *dentry;
     struct ceph_mds_session *lease_session;
     struct list_head lease_list;
     struct hlist_node hnode;
     unsigned long flags;
     int lease_shared_gen;
     u32 lease_gen;
     u32 lease_seq;
     unsigned long lease_renew_after, lease_renew_from;
     unsigned long time;
     u64 offset;
 };
 
 #define CEPH_DENTRY_REFERENCED      (1 << 0)
 #define CEPH_DENTRY_LEASE_LIST      (1 << 1)
 #define CEPH_DENTRY_SHRINK_LIST     (1 << 2)
 #define CEPH_DENTRY_PRIMARY_LINK    (1 << 3)
 #define CEPH_DENTRY_ASYNC_UNLINK_BIT    (4)
 #define CEPH_DENTRY_ASYNC_UNLINK    (1 << CEPH_DENTRY_ASYNC_UNLINK_BIT)
 #define CEPH_DENTRY_ASYNC_CREATE_BIT    (5)
 #define CEPH_DENTRY_ASYNC_CREATE    (1 << CEPH_DENTRY_ASYNC_CREATE_BIT)
 
 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 netfs_inode netfs; /* Netfslib context and vfs inode */
     struct ceph_vino i_vino;   /* ceph ino + snap */
 
     spinlock_t i_ceph_lock;
 
     u64 i_version;
     u64 i_inline_version;
     u32 i_time_warp_seq;
 
     unsigned long i_ceph_flags;
     atomic64_t i_release_count;
     atomic64_t i_ordered_count;
     atomic64_t i_complete_seq[2];
 
     struct ceph_dir_layout i_dir_layout;
     struct ceph_file_layout i_layout;
     struct ceph_file_layout i_cached_layout;    // for async creates
     char *i_symlink;
 
     /* for dirs */
     struct timespec64 i_rctime;
     u64 i_rbytes, i_rfiles, i_rsubdirs, i_rsnaps;
     u64 i_files, i_subdirs;
 
     /* quotas */
     u64 i_max_bytes, i_max_files;
 
     s32 i_dir_pin;
 
     struct rb_root i_fragtree;
     int i_fragtree_nsplits;
     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 */
 
     /*
      * Link to the auth cap's session's s_cap_dirty list. s_cap_dirty
      * is protected by the mdsc->cap_dirty_lock, but each individual item
      * is also protected by the inode's i_ceph_lock. Walking s_cap_dirty
      * requires the mdsc->cap_dirty_lock. List presence for an item can
      * be tested under the i_ceph_lock. Changing anything requires both.
      */
     struct list_head i_dirty_item;
 
     /*
      * Link to session's s_cap_flushing list. Protected in a similar
      * fashion to i_dirty_item, but also by the s_mutex for changes. The
      * s_cap_flushing list can be walked while holding either the s_mutex
      * or msdc->cap_dirty_lock. List presence can also be checked while
      * holding the i_ceph_lock for this inode.
      */
     struct list_head i_flushing_item;
 
     /* 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. */
     struct ceph_cap_flush *i_prealloc_cap_flush;
     struct list_head i_cap_flush_list;
     wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
     unsigned long i_hold_caps_max; /* jiffies */
     struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
     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 */
 
     unsigned long i_last_rd;
     unsigned long i_last_wr;
     int i_nr_by_mode[CEPH_FILE_MODE_BITS];  /* open file counts */
 
     struct mutex i_truncate_mutex;
     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, i_fx_ref;
     int i_wrbuffer_ref, i_wrbuffer_ref_head;
     atomic_t i_filelock_ref;
     atomic_t 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_dirops; /* uncommitted mds dir ops */
     struct list_head i_unsafe_iops;   /* uncommitted mds inode ops */
     spinlock_t i_unsafe_lock;
 
     union {
         struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
         struct ceph_snapid_map *i_snapid_map; /* snapid -> dev_t */
     };
     struct list_head i_snap_realm_item;
     struct list_head i_snap_flush_item;
     struct timespec64 i_btime;
     struct timespec64 i_snap_btime;
 
     struct work_struct i_work;
     unsigned long  i_work_mask;
 };
 
 static inline struct ceph_inode_info *
 ceph_inode(const struct inode *inode)
 {
     return container_of(inode, struct ceph_inode_info, netfs.inode);
 }
 
 static inline struct ceph_fs_client *
 ceph_inode_to_client(const struct inode *inode)
 {
     return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
 }
 
 static inline struct ceph_fs_client *
 ceph_sb_to_client(const struct super_block *sb)
 {
     return (struct ceph_fs_client *)sb->s_fs_info;
 }
 
 static inline struct ceph_mds_client *
 ceph_sb_to_mdsc(const struct super_block *sb)
 {
     return (struct ceph_mds_client *)ceph_sb_to_client(sb)->mdsc;
 }
 
 static inline struct ceph_vino
 ceph_vino(const struct inode *inode)
 {
     return ceph_inode(inode)->i_vino;
 }
 
 static inline u32 ceph_ino_to_ino32(u64 vino)
 {
     u32 ino = vino & 0xffffffff;
     ino ^= vino >> 32;
     if (!ino)
         ino = 2;
     return ino;
 }
 
 /*
  * Inode numbers in cephfs are 64 bits, but inode->i_ino is 32-bits on
  * some arches. We generally do not use this value inside the ceph driver, but
  * we do want to set it to something, so that generic vfs code has an
  * appropriate value for tracepoints and the like.
  */
 static inline ino_t ceph_vino_to_ino_t(struct ceph_vino vino)
 {
     if (sizeof(ino_t) == sizeof(u32))
         return ceph_ino_to_ino32(vino.ino);
     return (ino_t)vino.ino;
 }
 
 /* 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;
 }
 
 /**
  * ceph_present_ino - format an inode number for presentation to userland
  * @sb: superblock where the inode lives
  * @ino: inode number to (possibly) convert
  *
  * If the user mounted with the ino32 option, then the 64-bit value needs
  * to be converted to something that can fit inside 32 bits. Note that
  * internal kernel code never uses this value, so this is entirely for
  * userland consumption.
  */
 static inline u64 ceph_present_ino(struct super_block *sb, u64 ino)
 {
     if (unlikely(ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)))
         return ceph_ino_to_ino32(ino);
     return ino;
 }
 
 static inline u64 ceph_present_inode(struct inode *inode)
 {
     return ceph_present_ino(inode->i_sb, ceph_ino(inode));
 }
 
 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;
 }
 
 /*
  * The MDS reserves a set of inodes for its own usage. These should never
  * be accessible by clients, and so the MDS has no reason to ever hand these
  * out. The range is CEPH_MDS_INO_MDSDIR_OFFSET..CEPH_INO_SYSTEM_BASE.
  *
  * These come from src/mds/mdstypes.h in the ceph sources.
  */
 #define CEPH_MAX_MDS            0x100
 #define CEPH_NUM_STRAY          10
 #define CEPH_MDS_INO_MDSDIR_OFFSET  (1 * CEPH_MAX_MDS)
 #define CEPH_MDS_INO_LOG_OFFSET     (2 * CEPH_MAX_MDS)
 #define CEPH_INO_SYSTEM_BASE        ((6*CEPH_MAX_MDS) + (CEPH_MAX_MDS * CEPH_NUM_STRAY))
 
 static inline bool ceph_vino_is_reserved(const struct ceph_vino vino)
 {
     if (vino.ino >= CEPH_INO_SYSTEM_BASE ||
         vino.ino < CEPH_MDS_INO_MDSDIR_OFFSET)
         return false;
 
     /* Don't warn on mdsdirs */
     WARN_RATELIMIT(vino.ino >= CEPH_MDS_INO_LOG_OFFSET,
             "Attempt to access reserved inode number 0x%llx",
             vino.ino);
     return true;
 }
 
 static inline struct inode *ceph_find_inode(struct super_block *sb,
                         struct ceph_vino vino)
 {
     if (ceph_vino_is_reserved(vino))
         return NULL;
 
     /*
      * NB: The hashval will be run through the fs/inode.c hash function
      * anyway, so there is no need to squash the inode number down to
      * 32-bits first. Just use low-order bits on arches with 32-bit long.
      */
     return ilookup5(sb, (unsigned long)vino.ino, ceph_ino_compare, &vino);
 }
 
 
 /*
  * Ceph inode.
  */
 #define CEPH_I_DIR_ORDERED  (1 << 0)  /* dentries in dir are ordered */
 #define CEPH_I_FLUSH        (1 << 2)  /* do not delay flush of dirty metadata */
 #define CEPH_I_POOL_PERM    (1 << 3)  /* pool rd/wr bits are valid */
 #define CEPH_I_POOL_RD      (1 << 4)  /* can read from pool */
 #define CEPH_I_POOL_WR      (1 << 5)  /* can write to pool */
 #define CEPH_I_SEC_INITED   (1 << 6)  /* security initialized */
 #define CEPH_I_KICK_FLUSH   (1 << 7)  /* kick flushing caps */
 #define CEPH_I_FLUSH_SNAPS  (1 << 8)  /* need flush snapss */
 #define CEPH_I_ERROR_WRITE  (1 << 9) /* have seen write errors */
 #define CEPH_I_ERROR_FILELOCK   (1 << 10) /* have seen file lock errors */
 #define CEPH_I_ODIRECT      (1 << 11) /* inode in direct I/O mode */
 #define CEPH_ASYNC_CREATE_BIT   (12)      /* async create in flight for this */
 #define CEPH_I_ASYNC_CREATE (1 << CEPH_ASYNC_CREATE_BIT)
 #define CEPH_I_SHUTDOWN     (1 << 13) /* inode is no longer usable */
 
 /*
  * Masks of ceph inode work.
  */
 #define CEPH_I_WORK_WRITEBACK       0
 #define CEPH_I_WORK_INVALIDATE_PAGES    1
 #define CEPH_I_WORK_VMTRUNCATE      2
 #define CEPH_I_WORK_CHECK_CAPS      3
 #define CEPH_I_WORK_FLUSH_SNAPS     4
 
 /*
  * We set the ERROR_WRITE bit when we start seeing write errors on an inode
  * and then clear it when they start succeeding. Note that we do a lockless
  * check first, and only take the lock if it looks like it needs to be changed.
  * The write submission code just takes this as a hint, so we're not too
  * worried if a few slip through in either direction.
  */
 static inline void ceph_set_error_write(struct ceph_inode_info *ci)
 {
     if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) {
         spin_lock(&ci->i_ceph_lock);
         ci->i_ceph_flags |= CEPH_I_ERROR_WRITE;
         spin_unlock(&ci->i_ceph_lock);
     }
 }
 
 static inline void ceph_clear_error_write(struct ceph_inode_info *ci)
 {
     if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) {
         spin_lock(&ci->i_ceph_lock);
         ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE;
         spin_unlock(&ci->i_ceph_lock);
     }
 }
 
 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
                        long long release_count,
                        long long ordered_count)
 {
     /*
      * Makes sure operations that setup readdir cache (update page
      * cache and i_size) are strongly ordered w.r.t. the following
      * atomic64_set() operations.
      */
     smp_mb();
     atomic64_set(&ci->i_complete_seq[0], release_count);
     atomic64_set(&ci->i_complete_seq[1], ordered_count);
 }
 
 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
 {
     atomic64_inc(&ci->i_release_count);
 }
 
 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci)
 {
     atomic64_inc(&ci->i_ordered_count);
 }
 
 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
 {
     return atomic64_read(&ci->i_complete_seq[0]) ==
         atomic64_read(&ci->i_release_count);
 }
 
 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
 {
     return  atomic64_read(&ci->i_complete_seq[0]) ==
         atomic64_read(&ci->i_release_count) &&
         atomic64_read(&ci->i_complete_seq[1]) ==
         atomic64_read(&ci->i_ordered_count);
 }
 
 static inline void ceph_dir_clear_complete(struct inode *inode)
 {
     __ceph_dir_clear_complete(ceph_inode(inode));
 }
 
 static inline void ceph_dir_clear_ordered(struct inode *inode)
 {
     __ceph_dir_clear_ordered(ceph_inode(inode));
 }
 
 static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
 {
     bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode));
     smp_rmb();
     return ret;
 }
 
 /* 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(const struct dentry *dentry)
 {
     return (struct ceph_dentry_info *)dentry->d_fsdata;
 }
 
 /*
  * 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_mask_metric(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_metric(struct ceph_inode_info *ci,
                            int mask, int touch)
 {
     int r;
     spin_lock(&ci->i_ceph_lock);
     r = __ceph_caps_issued_mask_metric(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 struct ceph_cap_flush *ceph_alloc_cap_flush(void);
 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf);
 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
                   struct ceph_cap_flush **pcf);
 
 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
                       struct ceph_cap *ocap, int mask);
 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
 extern int __ceph_caps_used(struct ceph_inode_info *ci);
 
 static inline bool __ceph_is_file_opened(struct ceph_inode_info *ci)
 {
     return ci->i_nr_by_mode[0];
 }
 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
 extern int __ceph_caps_wanted(struct ceph_inode_info *ci);
 
 /* what the mds thinks we want */
 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check);
 
 extern void ceph_caps_init(struct ceph_mds_client *mdsc);
 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
 extern void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc,
                      struct ceph_mount_options *fsopt);
 extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
                  struct ceph_cap_reservation *ctx, int need);
 extern void 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);
 extern void change_auth_cap_ses(struct ceph_inode_info *ci,
                 struct ceph_mds_session *session);
 
 
 
 /*
  * 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_* */
 
     spinlock_t rw_contexts_lock;
     struct list_head rw_contexts;
 
     u32 filp_gen;
     atomic_t num_locks;
 };
 
 struct ceph_dir_file_info {
     struct ceph_file_info file_info;
 
     /* readdir: position within the dir */
     u32 frag;
     struct ceph_mds_request *last_readdir;
 
     /* readdir: position within a frag */
     unsigned next_offset;  /* offset of next chunk (last_name's + 1) */
     char *last_name;       /* last entry in previous chunk */
     long long dir_release_count;
     long long dir_ordered_count;
     int readdir_cache_idx;
 
     /* used for -o dirstat read() on directory thing */
     char *dir_info;
     int dir_info_len;
 };
 
 struct ceph_rw_context {
     struct list_head list;
     struct task_struct *thread;
     int caps;
 };
 
 #define CEPH_DEFINE_RW_CONTEXT(_name, _caps)    \
     struct ceph_rw_context _name = {    \
         .thread = current,      \
         .caps = _caps,          \
     }
 
 static inline void ceph_add_rw_context(struct ceph_file_info *cf,
                        struct ceph_rw_context *ctx)
 {
     spin_lock(&cf->rw_contexts_lock);
     list_add(&ctx->list, &cf->rw_contexts);
     spin_unlock(&cf->rw_contexts_lock);
 }
 
 static inline void ceph_del_rw_context(struct ceph_file_info *cf,
                        struct ceph_rw_context *ctx)
 {
     spin_lock(&cf->rw_contexts_lock);
     list_del(&ctx->list);
     spin_unlock(&cf->rw_contexts_lock);
 }
 
 static inline struct ceph_rw_context*
 ceph_find_rw_context(struct ceph_file_info *cf)
 {
     struct ceph_rw_context *ctx, *found = NULL;
     spin_lock(&cf->rw_contexts_lock);
     list_for_each_entry(ctx, &cf->rw_contexts, list) {
         if (ctx->thread == current) {
             found = ctx;
             break;
         }
     }
     spin_unlock(&cf->rw_contexts_lock);
     return found;
 }
 
 struct ceph_readdir_cache_control {
     struct page  *page;
     struct dentry **dentries;
     int index;
 };
 
 /*
  * 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;
     struct inode *inode;
     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 */
 
     struct list_head rebuild_item;   /* rebuild snap realms _downward_ in hierarchy */
 
     /* 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;
 }
 
 
 /* super.c */
 extern int ceph_force_reconnect(struct super_block *sb);
 /* 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,
                   struct ceph_snap_realm **realm_ret);
 void ceph_change_snap_realm(struct inode *inode, struct ceph_snap_realm *realm);
 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
                  struct ceph_mds_session *session,
                  struct ceph_msg *msg);
 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
                   struct ceph_cap_snap *capsnap);
 extern void ceph_cleanup_global_and_empty_realms(struct ceph_mds_client *mdsc);
 
 extern struct ceph_snapid_map *ceph_get_snapid_map(struct ceph_mds_client *mdsc,
                            u64 snap);
 extern void ceph_put_snapid_map(struct ceph_mds_client* mdsc,
                 struct ceph_snapid_map *sm);
 extern void ceph_trim_snapid_map(struct ceph_mds_client *mdsc);
 extern void ceph_cleanup_snapid_map(struct ceph_mds_client *mdsc);
 void ceph_umount_begin(struct super_block *sb);
 
 
 /*
  * 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_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap,
                    ci_item)->writing;
 }
 
 /* inode.c */
 struct ceph_mds_reply_info_in;
 struct ceph_mds_reply_dirfrag;
 
 extern const struct inode_operations ceph_file_iops;
 
 extern struct inode *ceph_alloc_inode(struct super_block *sb);
 extern void ceph_evict_inode(struct inode *inode);
 extern void ceph_free_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 timespec64 *ctime,
                 struct timespec64 *mtime,
                 struct timespec64 *atime);
 extern int ceph_fill_inode(struct inode *inode, struct page *locked_page,
             struct ceph_mds_reply_info_in *iinfo,
             struct ceph_mds_reply_dirfrag *dirinfo,
             struct ceph_mds_session *session, int cap_fmode,
             struct ceph_cap_reservation *caps_reservation);
 extern int ceph_fill_trace(struct super_block *sb,
                struct ceph_mds_request *req);
 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 bool ceph_inode_set_size(struct inode *inode, loff_t size);
 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
 
 void ceph_queue_inode_work(struct inode *inode, int work_bit);
 
 static inline void ceph_queue_vmtruncate(struct inode *inode)
 {
     ceph_queue_inode_work(inode, CEPH_I_WORK_VMTRUNCATE);
 }
 
 static inline void ceph_queue_invalidate(struct inode *inode)
 {
     ceph_queue_inode_work(inode, CEPH_I_WORK_INVALIDATE_PAGES);
 }
 
 static inline void ceph_queue_writeback(struct inode *inode)
 {
     ceph_queue_inode_work(inode, CEPH_I_WORK_WRITEBACK);
 }
 
 static inline void ceph_queue_check_caps(struct inode *inode)
 {
     ceph_queue_inode_work(inode, CEPH_I_WORK_CHECK_CAPS);
 }
 
 static inline void ceph_queue_flush_snaps(struct inode *inode)
 {
     ceph_queue_inode_work(inode, CEPH_I_WORK_FLUSH_SNAPS);
 }
 
 extern int ceph_try_to_choose_auth_mds(struct inode *inode, int mask);
 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
                  int mask, bool force);
 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
 {
     return __ceph_do_getattr(inode, NULL, mask, force);
 }
 extern int ceph_permission(struct user_namespace *mnt_userns,
                struct inode *inode, int mask);
 extern int __ceph_setattr(struct inode *inode, struct iattr *attr);
 extern int ceph_setattr(struct user_namespace *mnt_userns,
             struct dentry *dentry, struct iattr *attr);
 extern int ceph_getattr(struct user_namespace *mnt_userns,
             const struct path *path, struct kstat *stat,
             u32 request_mask, unsigned int flags);
 void ceph_inode_shutdown(struct inode *inode);
 
 static inline bool ceph_inode_is_shutdown(struct inode *inode)
 {
     unsigned long flags = READ_ONCE(ceph_inode(inode)->i_ceph_flags);
     struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
     int state = READ_ONCE(fsc->mount_state);
 
     return (flags & CEPH_I_SHUTDOWN) || state >= CEPH_MOUNT_SHUTDOWN;
 }
 
 /* xattr.c */
 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int);
 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value, size_t size);
 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 extern struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci);
 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 extern const struct xattr_handler *ceph_xattr_handlers[];
 
 struct ceph_acl_sec_ctx {
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
     void *default_acl;
     void *acl;
 #endif
 #ifdef CONFIG_CEPH_FS_SECURITY_LABEL
     void *sec_ctx;
     u32 sec_ctxlen;
 #endif
     struct ceph_pagelist *pagelist;
 };
 
 #ifdef CONFIG_SECURITY
 extern bool ceph_security_xattr_deadlock(struct inode *in);
 extern bool ceph_security_xattr_wanted(struct inode *in);
 #else
 static inline bool ceph_security_xattr_deadlock(struct inode *in)
 {
     return false;
 }
 static inline bool ceph_security_xattr_wanted(struct inode *in)
 {
     return false;
 }
 #endif
 
 #ifdef CONFIG_CEPH_FS_SECURITY_LABEL
 extern int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
                      struct ceph_acl_sec_ctx *ctx);
 static inline void ceph_security_invalidate_secctx(struct inode *inode)
 {
     security_inode_invalidate_secctx(inode);
 }
 #else
 static inline int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
                         struct ceph_acl_sec_ctx *ctx)
 {
     return 0;
 }
 static inline void ceph_security_invalidate_secctx(struct inode *inode)
 {
 }
 #endif
 
 void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx);
 
 /* acl.c */
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 
 struct posix_acl *ceph_get_acl(struct inode *, int, bool);
 int ceph_set_acl(struct user_namespace *mnt_userns,
          struct inode *inode, struct posix_acl *acl, int type);
 int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
                struct ceph_acl_sec_ctx *as_ctx);
 void ceph_init_inode_acls(struct inode *inode,
               struct ceph_acl_sec_ctx *as_ctx);
 
 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 {
        forget_all_cached_acls(inode);
 }
 
 #else
 
 #define ceph_get_acl NULL
 #define ceph_set_acl NULL
 
 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
                      struct ceph_acl_sec_ctx *as_ctx)
 {
     return 0;
 }
 static inline void ceph_init_inode_acls(struct inode *inode,
                     struct ceph_acl_sec_ctx *as_ctx)
 {
 }
 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
 {
     return 0;
 }
 
 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 {
 }
 
 #endif
 
 /* 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 struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
                      struct ceph_cap_reservation *ctx);
 extern void ceph_add_cap(struct inode *inode,
              struct ceph_mds_session *session, u64 cap_id,
              unsigned issued, unsigned wanted,
              unsigned cap, unsigned seq, u64 realmino, int flags,
              struct ceph_cap **new_cap);
 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 extern void ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 extern void __ceph_remove_caps(struct ceph_inode_info *ci);
 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
              struct ceph_cap *cap);
 extern int ceph_is_any_caps(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_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
                       struct ceph_mds_session *session);
 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
                     struct ceph_mds_session *session);
 void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session,
                    struct ceph_inode_info *ci);
 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
                          int mds);
 extern void ceph_take_cap_refs(struct ceph_inode_info *ci, int caps,
                 bool snap_rwsem_locked);
 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_cap_refs_async(struct ceph_inode_info *ci, int had);
 extern void ceph_put_cap_refs_no_check_caps(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_remove_capsnap(struct inode *inode,
                   struct ceph_cap_snap *capsnap,
                   bool *wake_ci, bool *wake_mdsc);
 extern void ceph_remove_capsnap(struct inode *inode,
                 struct ceph_cap_snap *capsnap,
                 bool *wake_ci, bool *wake_mdsc);
 extern void ceph_flush_snaps(struct ceph_inode_info *ci,
                  struct ceph_mds_session **psession);
 extern bool __ceph_should_report_size(struct ceph_inode_info *ci);
 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
                 struct ceph_mds_session *session);
 extern unsigned long ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
 extern int  ceph_drop_caps_for_unlink(struct inode *inode);
 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,
                       struct inode *dir,
                       int mds, int drop, int unless);
 
 extern int ceph_get_caps(struct file *filp, int need, int want,
              loff_t endoff, int *got);
 extern int ceph_try_get_caps(struct inode *inode,
                  int need, int want, bool nonblock, int *got);
 
 /* for counting open files by mode */
 extern void ceph_get_fmode(struct ceph_inode_info *ci, int mode, int count);
 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode, int count);
 extern void __ceph_touch_fmode(struct ceph_inode_info *ci,
                    struct ceph_mds_client *mdsc, int fmode);
 
 /* addr.c */
 extern const struct address_space_operations ceph_aops;
 extern const struct netfs_request_ops ceph_netfs_ops;
 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 extern int ceph_uninline_data(struct file *file);
 extern int ceph_pool_perm_check(struct inode *inode, int need);
 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc);
 int ceph_purge_inode_cap(struct inode *inode, struct ceph_cap *cap, bool *invalidate);
 
 static inline bool ceph_has_inline_data(struct ceph_inode_info *ci)
 {
     if (ci->i_inline_version == CEPH_INLINE_NONE ||
         ci->i_inline_version == 1) /* initial version, no data */
         return false;
     return true;
 }
 
 /* file.c */
 extern const struct file_operations ceph_file_fops;
 
 extern int ceph_renew_caps(struct inode *inode, int fmode);
 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);
 extern int ceph_release(struct inode *inode, struct file *filp);
 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
                   char *data, size_t len);
 
 /* dir.c */
 extern const struct file_operations ceph_dir_fops;
 extern const struct file_operations ceph_snapdir_fops;
 extern const struct inode_operations ceph_dir_iops;
 extern const struct inode_operations ceph_snapdir_iops;
 extern const struct dentry_operations ceph_dentry_ops;
 
 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order);
 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
 extern struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req,
                    struct dentry *dentry);
 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
                      struct dentry *dentry, int err);
 
 extern void __ceph_dentry_lease_touch(struct ceph_dentry_info *di);
 extern void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di);
 extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 extern int ceph_trim_dentries(struct ceph_mds_client *mdsc);
 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl);
 
 /* 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;
 struct inode *ceph_lookup_inode(struct super_block *sb, u64 ino);
 
 /* locks.c */
 extern __init void ceph_flock_init(void);
 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_to_buffer(struct inode *inode,
                        struct ceph_filelock *flocks,
                        int num_fcntl_locks,
                        int num_flock_locks);
 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
                   struct ceph_pagelist *pagelist,
                   int num_fcntl_locks, int num_flock_locks);
 
 /* debugfs.c */
 extern void ceph_fs_debugfs_init(struct ceph_fs_client *client);
 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
 
 /* quota.c */
 
 enum quota_get_realm {
     QUOTA_GET_MAX_FILES,
     QUOTA_GET_MAX_BYTES,
     QUOTA_GET_ANY
 };
 
 static inline bool __ceph_has_quota(struct ceph_inode_info *ci,
                     enum quota_get_realm which)
 {
     bool has_quota = false;
 
     switch (which) {
     case QUOTA_GET_MAX_BYTES:
         has_quota = !!ci->i_max_bytes;
         break;
     case QUOTA_GET_MAX_FILES:
         has_quota = !!ci->i_max_files;
         break;
     default:
         has_quota = !!(ci->i_max_files || ci->i_max_bytes);
     }
     return has_quota;
 }
 
 extern void ceph_adjust_quota_realms_count(struct inode *inode, bool inc);
 
 static inline void __ceph_update_quota(struct ceph_inode_info *ci,
                        u64 max_bytes, u64 max_files)
 {
     bool had_quota, has_quota;
     had_quota = __ceph_has_quota(ci, QUOTA_GET_ANY);
     ci->i_max_bytes = max_bytes;
     ci->i_max_files = max_files;
     has_quota = __ceph_has_quota(ci, QUOTA_GET_ANY);
 
     if (had_quota != has_quota)
         ceph_adjust_quota_realms_count(&ci->netfs.inode, has_quota);
 }
 
 extern void ceph_handle_quota(struct ceph_mds_client *mdsc,
                   struct ceph_mds_session *session,
                   struct ceph_msg *msg);
 extern bool ceph_quota_is_max_files_exceeded(struct inode *inode);
 extern bool ceph_quota_is_same_realm(struct inode *old, struct inode *new);
 extern bool ceph_quota_is_max_bytes_exceeded(struct inode *inode,
                          loff_t newlen);
 extern bool ceph_quota_is_max_bytes_approaching(struct inode *inode,
                         loff_t newlen);
 extern bool ceph_quota_update_statfs(struct ceph_fs_client *fsc,
                      struct kstatfs *buf);
 extern void ceph_cleanup_quotarealms_inodes(struct ceph_mds_client *mdsc);
 
 #endif /* _FS_CEPH_SUPER_H */

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