v4.19.13 snapshot.
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
new file mode 100644
index 0000000..68bb09c
--- /dev/null
+++ b/include/linux/ceph/libceph.h
@@ -0,0 +1,317 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _FS_CEPH_LIBCEPH_H
+#define _FS_CEPH_LIBCEPH_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/bug.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/refcount.h>
+
+#include <linux/ceph/types.h>
+#include <linux/ceph/messenger.h>
+#include <linux/ceph/msgpool.h>
+#include <linux/ceph/mon_client.h>
+#include <linux/ceph/osd_client.h>
+#include <linux/ceph/ceph_fs.h>
+#include <linux/ceph/string_table.h>
+
+/*
+ * mount options
+ */
+#define CEPH_OPT_FSID (1<<0)
+#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
+#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
+#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
+#define CEPH_OPT_NOMSGAUTH (1<<4) /* don't require msg signing feat */
+#define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */
+#define CEPH_OPT_NOMSGSIGN (1<<6) /* don't sign msgs */
+
+#define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY)
+
+#define ceph_set_opt(client, opt) \
+ (client)->options->flags |= CEPH_OPT_##opt;
+#define ceph_test_opt(client, opt) \
+ (!!((client)->options->flags & CEPH_OPT_##opt))
+
+struct ceph_options {
+ int flags;
+ struct ceph_fsid fsid;
+ struct ceph_entity_addr my_addr;
+ unsigned long mount_timeout; /* jiffies */
+ unsigned long osd_idle_ttl; /* jiffies */
+ unsigned long osd_keepalive_timeout; /* jiffies */
+ unsigned long osd_request_timeout; /* jiffies */
+
+ /*
+ * any type that can't be simply compared or doesn't need need
+ * to be compared should go beyond this point,
+ * ceph_compare_options() should be updated accordingly
+ */
+
+ struct ceph_entity_addr *mon_addr; /* should be the first
+ pointer type of args */
+ int num_mon;
+ char *name;
+ struct ceph_crypto_key *key;
+};
+
+/*
+ * defaults
+ */
+#define CEPH_MOUNT_TIMEOUT_DEFAULT msecs_to_jiffies(60 * 1000)
+#define CEPH_OSD_KEEPALIVE_DEFAULT msecs_to_jiffies(5 * 1000)
+#define CEPH_OSD_IDLE_TTL_DEFAULT msecs_to_jiffies(60 * 1000)
+#define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0 /* no timeout */
+
+#define CEPH_MONC_HUNT_INTERVAL msecs_to_jiffies(3 * 1000)
+#define CEPH_MONC_PING_INTERVAL msecs_to_jiffies(10 * 1000)
+#define CEPH_MONC_PING_TIMEOUT msecs_to_jiffies(30 * 1000)
+#define CEPH_MONC_HUNT_BACKOFF 2
+#define CEPH_MONC_HUNT_MAX_MULT 10
+
+#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
+#define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024)
+
+/*
+ * Handle the largest possible rbd object in one message.
+ * There is no limit on the size of cephfs objects, but it has to obey
+ * rsize and wsize mount options anyway.
+ */
+#define CEPH_MSG_MAX_DATA_LEN (32*1024*1024)
+
+#define CEPH_AUTH_NAME_DEFAULT "guest"
+
+/* mount state */
+enum {
+ CEPH_MOUNT_MOUNTING,
+ CEPH_MOUNT_MOUNTED,
+ CEPH_MOUNT_UNMOUNTING,
+ CEPH_MOUNT_UNMOUNTED,
+ CEPH_MOUNT_SHUTDOWN,
+};
+
+static inline unsigned long ceph_timeout_jiffies(unsigned long timeout)
+{
+ return timeout ?: MAX_SCHEDULE_TIMEOUT;
+}
+
+struct ceph_mds_client;
+
+/*
+ * per client state
+ *
+ * possibly shared by multiple mount points, if they are
+ * mounting the same ceph filesystem/cluster.
+ */
+struct ceph_client {
+ struct ceph_fsid fsid;
+ bool have_fsid;
+
+ void *private;
+
+ struct ceph_options *options;
+
+ struct mutex mount_mutex; /* serialize mount attempts */
+ wait_queue_head_t auth_wq;
+ int auth_err;
+
+ int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
+
+ u64 supported_features;
+ u64 required_features;
+
+ struct ceph_messenger msgr; /* messenger instance */
+ struct ceph_mon_client monc;
+ struct ceph_osd_client osdc;
+
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *debugfs_dir;
+ struct dentry *debugfs_monmap;
+ struct dentry *debugfs_osdmap;
+ struct dentry *debugfs_options;
+#endif
+};
+
+#define from_msgr(ms) container_of(ms, struct ceph_client, msgr)
+
+
+/*
+ * snapshots
+ */
+
+/*
+ * A "snap context" is the set of existing snapshots when we
+ * write data. It is used by the OSD to guide its COW behavior.
+ *
+ * The ceph_snap_context is refcounted, and attached to each dirty
+ * page, indicating which context the dirty data belonged when it was
+ * dirtied.
+ */
+struct ceph_snap_context {
+ refcount_t nref;
+ u64 seq;
+ u32 num_snaps;
+ u64 snaps[];
+};
+
+extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
+ gfp_t gfp_flags);
+extern struct ceph_snap_context *ceph_get_snap_context(
+ struct ceph_snap_context *sc);
+extern void ceph_put_snap_context(struct ceph_snap_context *sc);
+
+/*
+ * calculate the number of pages a given length and offset map onto,
+ * if we align the data.
+ */
+static inline int calc_pages_for(u64 off, u64 len)
+{
+ return ((off+len+PAGE_SIZE-1) >> PAGE_SHIFT) -
+ (off >> PAGE_SHIFT);
+}
+
+#define RB_BYVAL(a) (a)
+#define RB_BYPTR(a) (&(a))
+#define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b))
+
+#define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
+static void insert_##name(struct rb_root *root, type *t) \
+{ \
+ struct rb_node **n = &root->rb_node; \
+ struct rb_node *parent = NULL; \
+ \
+ BUG_ON(!RB_EMPTY_NODE(&t->nodefld)); \
+ \
+ while (*n) { \
+ type *cur = rb_entry(*n, type, nodefld); \
+ int cmp; \
+ \
+ parent = *n; \
+ cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld)); \
+ if (cmp < 0) \
+ n = &(*n)->rb_left; \
+ else if (cmp > 0) \
+ n = &(*n)->rb_right; \
+ else \
+ BUG(); \
+ } \
+ \
+ rb_link_node(&t->nodefld, parent, n); \
+ rb_insert_color(&t->nodefld, root); \
+} \
+static void erase_##name(struct rb_root *root, type *t) \
+{ \
+ BUG_ON(RB_EMPTY_NODE(&t->nodefld)); \
+ rb_erase(&t->nodefld, root); \
+ RB_CLEAR_NODE(&t->nodefld); \
+}
+
+/*
+ * @lookup_param_type is a parameter and not constructed from (@type,
+ * @keyfld) with typeof() because adding const is too unwieldy.
+ */
+#define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \
+ lookup_param_type, nodefld) \
+static type *lookup_##name(struct rb_root *root, lookup_param_type key) \
+{ \
+ struct rb_node *n = root->rb_node; \
+ \
+ while (n) { \
+ type *cur = rb_entry(n, type, nodefld); \
+ int cmp; \
+ \
+ cmp = cmpexp(key, keyexp(cur->keyfld)); \
+ if (cmp < 0) \
+ n = n->rb_left; \
+ else if (cmp > 0) \
+ n = n->rb_right; \
+ else \
+ return cur; \
+ } \
+ \
+ return NULL; \
+}
+
+#define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp, \
+ lookup_param_type, nodefld) \
+DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
+DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \
+ lookup_param_type, nodefld)
+
+/*
+ * Shorthands for integer keys.
+ */
+#define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \
+DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld)
+
+#define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) \
+extern type __lookup_##name##_key; \
+DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, \
+ typeof(__lookup_##name##_key.keyfld), nodefld)
+
+#define DEFINE_RB_FUNCS(name, type, keyfld, nodefld) \
+DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \
+DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld)
+
+extern struct kmem_cache *ceph_inode_cachep;
+extern struct kmem_cache *ceph_cap_cachep;
+extern struct kmem_cache *ceph_cap_flush_cachep;
+extern struct kmem_cache *ceph_dentry_cachep;
+extern struct kmem_cache *ceph_file_cachep;
+extern struct kmem_cache *ceph_dir_file_cachep;
+
+/* ceph_common.c */
+extern bool libceph_compatible(void *data);
+
+extern const char *ceph_msg_type_name(int type);
+extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
+extern void *ceph_kvmalloc(size_t size, gfp_t flags);
+
+extern struct ceph_options *ceph_parse_options(char *options,
+ const char *dev_name, const char *dev_name_end,
+ int (*parse_extra_token)(char *c, void *private),
+ void *private);
+int ceph_print_client_options(struct seq_file *m, struct ceph_client *client);
+extern void ceph_destroy_options(struct ceph_options *opt);
+extern int ceph_compare_options(struct ceph_options *new_opt,
+ struct ceph_client *client);
+struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private);
+struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client);
+u64 ceph_client_gid(struct ceph_client *client);
+extern void ceph_destroy_client(struct ceph_client *client);
+extern int __ceph_open_session(struct ceph_client *client,
+ unsigned long started);
+extern int ceph_open_session(struct ceph_client *client);
+
+/* pagevec.c */
+extern void ceph_release_page_vector(struct page **pages, int num_pages);
+
+extern struct page **ceph_get_direct_page_vector(const void __user *data,
+ int num_pages,
+ bool write_page);
+extern void ceph_put_page_vector(struct page **pages, int num_pages,
+ bool dirty);
+extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
+extern int ceph_copy_user_to_page_vector(struct page **pages,
+ const void __user *data,
+ loff_t off, size_t len);
+extern void ceph_copy_to_page_vector(struct page **pages,
+ const void *data,
+ loff_t off, size_t len);
+extern void ceph_copy_from_page_vector(struct page **pages,
+ void *data,
+ loff_t off, size_t len);
+extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
+
+
+#endif /* _FS_CEPH_SUPER_H */