Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1421 insertions, 0 deletions

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
new file mode 100644
index 000000000..51c7f2b14
--- /dev/null
+++ b/fs/ceph/super.h
@@ -0,0 +1,1421 @@
+/* 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>
+#include "crypto.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_SPARSEREAD      (1<<17) /* always do sparse reads */
+
+#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;
+	struct fscrypt_dummy_policy dummy_enc_policy;
+};
+
+/* mount state */
+enum {
+	CEPH_MOUNT_MOUNTING,
+	CEPH_MOUNT_MOUNTED,
+	CEPH_MOUNT_UNMOUNTING,
+	CEPH_MOUNT_UNMOUNTED,
+	CEPH_MOUNT_SHUTDOWN,
+	CEPH_MOUNT_RECOVER,
+	CEPH_MOUNT_FENCE_IO,
+};
+
+#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
+#ifdef CONFIG_FS_ENCRYPTION
+	struct fscrypt_dummy_policy fsc_dummy_enc_policy;
+#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 */
+	/*
+	 * For none fscrypt case it equals to i_truncate_size or it will
+	 * equals to fscrypt_file_size
+	 */
+	u64 i_truncate_pagecache_size;
+
+	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;
+
+#ifdef CONFIG_FS_ENCRYPTION
+	u32 fscrypt_auth_len;
+	u32 fscrypt_file_len;
+	u8 *fscrypt_auth;
+	u8 *fscrypt_file;
+#endif
+};
+
+struct ceph_netfs_request_data {
+	int caps;
+
+	/*
+	 * Maximum size of a file readahead request.
+	 * The fadvise could update the bdi's default ra_pages.
+	 */
+	unsigned int file_ra_pages;
+
+	/* Set it if fadvise disables file readahead entirely */
+	bool file_ra_disabled;
+};
+
+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 */
+#define CEPH_I_ASYNC_CHECK_CAPS	(1 << 14) /* check caps immediately after async
+					     creating finishes */
+
+/*
+ * 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;
+};
+
+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;
+struct ceph_acl_sec_ctx;
+
+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);
+
+struct inode *ceph_new_inode(struct inode *dir, struct dentry *dentry,
+			     umode_t *mode, struct ceph_acl_sec_ctx *as_ctx);
+void ceph_as_ctx_to_req(struct ceph_mds_request *req,
+			struct ceph_acl_sec_ctx *as_ctx);
+
+extern struct inode *ceph_get_inode(struct super_block *sb,
+				    struct ceph_vino vino,
+				    struct inode *newino);
+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 mnt_idmap *idmap,
+			   struct inode *inode, int mask);
+
+struct ceph_iattr {
+	struct ceph_fscrypt_auth	*fscrypt_auth;
+};
+
+extern int __ceph_setattr(struct inode *inode, struct iattr *attr,
+			  struct ceph_iattr *cia);
+extern int ceph_setattr(struct mnt_idmap *idmap,
+			struct dentry *dentry, struct iattr *attr);
+extern int ceph_getattr(struct mnt_idmap *idmap,
+			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
+#ifdef CONFIG_FS_ENCRYPTION
+	struct ceph_fscrypt_auth *fscrypt_auth;
+#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 mnt_idmap *idmap,
+		 struct dentry *dentry, 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 *__get_cap_for_mds(struct ceph_inode_info *ci,
+					  int mds);
+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);
+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 inode *inode, struct ceph_file_info *fi,
+			   int need, int want, loff_t endoff, int *got);
+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 ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
+				struct iov_iter *to, int *retry_op,
+				u64 *last_objver);
+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);
+
+bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc,
+			       struct ceph_mds_session *session);
+void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc);
+bool ceph_inc_osd_stopping_blocker(struct ceph_mds_client *mdsc);
+void ceph_dec_osd_stopping_blocker(struct ceph_mds_client *mdsc);
+#endif /* _FS_CEPH_SUPER_H */