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Message-Id: <1245450702-31343-5-git-send-email-sage@newdream.net>
Date: Fri, 19 Jun 2009 15:31:25 -0700
From: Sage Weil <sage@...dream.net>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
greg@...ah.com
Cc: Sage Weil <sage@...dream.net>
Subject: [PATCH 04/21] ceph: client types
We first define constants, types, and prototypes for the kernel client
proper.
A few subsystems are defined separately later: the MDS, OSD, and
monitor clients, and the messaging layer.
Signed-off-by: Sage Weil <sage@...dream.net>
---
fs/staging/ceph/ceph_ver.h | 6 +
fs/staging/ceph/super.h | 946 ++++++++++++++++++++++++++++++++++++++++++++
fs/staging/ceph/types.h | 27 ++
3 files changed, 979 insertions(+), 0 deletions(-)
create mode 100644 fs/staging/ceph/ceph_ver.h
create mode 100644 fs/staging/ceph/super.h
create mode 100644 fs/staging/ceph/types.h
diff --git a/fs/staging/ceph/ceph_ver.h b/fs/staging/ceph/ceph_ver.h
new file mode 100644
index 0000000..aa3e8cf
--- /dev/null
+++ b/fs/staging/ceph/ceph_ver.h
@@ -0,0 +1,6 @@
+#ifndef __CEPH_VERSION_H
+#define __CEPH_VERSION_H
+
+#define CEPH_GIT_VER 414818539242fadfd54c99de40f982694c1f2fe2
+
+#endif
diff --git a/fs/staging/ceph/super.h b/fs/staging/ceph/super.h
new file mode 100644
index 0000000..1eaf82e
--- /dev/null
+++ b/fs/staging/ceph/super.h
@@ -0,0 +1,946 @@
+#ifndef _FS_CEPH_SUPER_H
+#define _FS_CEPH_SUPER_H
+
+#include <linux/fs.h>
+#include <linux/wait.h>
+#include <linux/completion.h>
+#include <linux/pagemap.h>
+#include <linux/exportfs.h>
+#include <linux/backing-dev.h>
+
+#include "types.h"
+#include "ceph_debug.h"
+#include "messenger.h"
+#include "mon_client.h"
+#include "mds_client.h"
+#include "osd_client.h"
+#include "ceph_fs.h"
+
+/* f_type in struct statfs */
+#define CEPH_SUPER_MAGIC 0x00c36400
+
+/* large granularity for statfs utilization stats to facilitate
+ * large volume sizes on 32-bit machines. */
+#define CEPH_BLOCK_SHIFT 20 /* 1 MB */
+#define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT)
+
+#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
+
+/*
+ * Delay telling the MDS we no longer wnat 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 */
+
+/*
+ * subtract jiffies
+ */
+static inline unsigned long time_sub(unsigned long a, unsigned long b)
+{
+ BUG_ON(time_after(b, a));
+ return (long)a - (long)b;
+}
+
+/*
+ * 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_UNSAFE_WRITEBACK (1<<3)
+#define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */
+#define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
+#define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */
+#define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
+
+#define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES)
+
+#define ceph_set_opt(client, opt) \
+ (client)->mount_args.flags |= CEPH_OPT_##opt;
+#define ceph_test_opt(client, opt) \
+ (!!((client)->mount_args.flags & CEPH_OPT_##opt))
+
+#define CEPH_DEFAULT_READ_SIZE (128*1024) /* readahead */
+
+#define MAX_MON_MOUNT_ADDR 5
+#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
+#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
+
+struct ceph_mount_args {
+ int sb_flags;
+ int flags;
+ int mount_timeout;
+ int caps_wanted_delay_min, caps_wanted_delay_max;
+ ceph_fsid_t fsid;
+ struct ceph_entity_addr my_addr;
+ int num_mon;
+ struct ceph_entity_addr mon_addr[MAX_MON_MOUNT_ADDR];
+ int wsize;
+ int rsize; /* max readahead */
+ int max_readdir; /* max readdir size */
+ int osd_timeout;
+ char *snapdir_name; /* default ".snap" */
+ int cap_release_safety;
+};
+
+enum {
+ CEPH_MOUNT_MOUNTING,
+ CEPH_MOUNT_MOUNTED,
+ CEPH_MOUNT_UNMOUNTING,
+ CEPH_MOUNT_UNMOUNTED,
+ CEPH_MOUNT_SHUTDOWN,
+};
+
+struct ceph_client_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct ceph_client *, struct ceph_client_attr *,
+ char *);
+ ssize_t (*store)(struct ceph_client *, struct ceph_client_attr *,
+ const char *, size_t);
+};
+
+/*
+ * per-filesystem client state
+ *
+ * possibly shared by multiple mount points, if they are
+ * mounting the same ceph filesystem/cluster.
+ */
+struct ceph_client {
+ u32 whoami; /* my client number */
+ struct kobject kobj;
+ struct ceph_client_attr k_fsid, k_monmap, k_mdsmap, k_osdmap;
+ struct dentry *debugfs_fsid, *debugfs_monmap;
+ struct dentry *debugfs_mdsmap, *debugfs_osdmap;
+ struct dentry *debugfs_dir, *debugfs_dentry_lru;
+
+ struct mutex mount_mutex; /* serialize mount attempts */
+ struct ceph_mount_args mount_args;
+ ceph_fsid_t fsid;
+
+ struct super_block *sb;
+
+ unsigned long mount_state;
+ wait_queue_head_t mount_wq;
+
+ int mount_err;
+ void *signed_ticket; /* our keys to the kingdom */
+ int signed_ticket_len;
+
+ struct ceph_messenger *msgr; /* messenger instance */
+ struct ceph_mon_client monc;
+ struct ceph_mds_client mdsc;
+ struct ceph_osd_client osdc;
+
+ /* writeback */
+ struct workqueue_struct *wb_wq;
+ struct workqueue_struct *pg_inv_wq;
+ struct workqueue_struct *trunc_wq;
+
+ struct backing_dev_info backing_dev_info;
+};
+
+static inline struct ceph_client *ceph_client(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+
+/*
+ * File i/o capability. This tracks shared state with the metadata
+ * server that allows us to read and write data to this file. For any
+ * given inode, we may have multiple 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 tree and by a per-mds
+ * session capability list(s).
+ */
+struct ceph_cap {
+ struct ceph_inode_info *ci;
+ struct rb_node ci_node; /* per-ci cap tree */
+ struct ceph_mds_session *session;
+ struct list_head session_caps; /* per-session caplist */
+ int mds;
+ u64 cap_id; /* unique cap id (mds provided) */
+ int issued; /* latest, from the mds */
+ int implemented; /* implemented superset of issued (for revocation) */
+ int mds_wanted;
+ u32 seq, issue_seq, mseq, gen;
+ unsigned long last_used;
+ struct list_head caps_item;
+};
+
+#define CHECK_CAPS_NODELAY 1 /* do not delay any further */
+#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
+
+/*
+ * Snapped cap state that is pending flush to mds. When a snapshot occurs,
+ * we first complete any in-process sync writes and writeback any dirty
+ * data before flushing the snapped state (tracked here) back to the MDS.
+ */
+struct ceph_cap_snap {
+ atomic_t nref;
+
+ struct list_head ci_item;
+ u64 follows;
+ int issued, dirty;
+ struct ceph_snap_context *context;
+
+ mode_t mode;
+ uid_t uid;
+ gid_t gid;
+
+ void *xattr_blob;
+ int xattr_len;
+ u64 xattr_version;
+
+ u64 size;
+ struct timespec mtime, atime, ctime;
+ u64 time_warp_seq;
+ int writing; /* a sync write is still in progress */
+ int dirty_pages; /* dirty pages awaiting writeback */
+};
+
+static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
+{
+ if (atomic_dec_and_test(&capsnap->nref))
+ kfree(capsnap);
+}
+
+/*
+ * The frag tree describes how a directory is fragmented, potentially across
+ * multiple metadata servers. It is also used to indicate points where
+ * metadata authority is delegated, and whether/where metadata is replicated.
+ *
+ * A _leaf_ frag will be present in the i_fragtree IFF there is
+ * delegation info. That is, if mds >= 0 || ndist > 0.
+ */
+#define 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 info */
+ int mds; /* -1 if same authority as parent */
+ int ndist; /* >0 if replicated */
+ int dist[MAX_DIRFRAG_REP];
+};
+
+struct ceph_inode_xattr {
+ struct rb_node node;
+
+ const char *name;
+ int name_len;
+ const char *val;
+ int val_len;
+ int dirty;
+
+ int should_free_name;
+ int should_free_val;
+};
+
+struct ceph_inode_xattrs_info {
+ struct rb_root xattrs;
+
+ /*
+ * (still encoded) xattr blob. we avoid the overhead of parsing
+ * this until someone actually calls getxattr, etc.
+ *
+ * if i_xattrs.len == 0 or 4, i_xattrs.data == NULL.
+ * i_xattrs.len == 4 implies there are no xattrs; 0 means we
+ * don't know.
+ */
+ int len;
+ char *data;
+ int count;
+ int names_size;
+ int vals_size;
+ u64 version;
+ u64 index_version;
+ int dirty;
+
+ void *prealloc_blob;
+ int prealloc_size;
+};
+
+/*
+ * Ceph inode.
+ */
+#define CEPH_I_COMPLETE 1 /* we have complete directory cached */
+#define CEPH_I_NODELAY 4 /* do not delay cap release */
+#define CEPH_I_FLUSH 8 /* do not delay cap send */
+
+struct ceph_inode_info {
+ struct ceph_vino i_vino; /* ceph ino + snap */
+
+ u64 i_version;
+ u32 i_time_warp_seq;
+
+ unsigned i_ceph_flags;
+ unsigned long i_release_count;
+
+ struct ceph_file_layout i_layout;
+ char *i_symlink;
+
+ /* for dirs */
+ struct timespec i_rctime;
+ u64 i_rbytes, i_rfiles, i_rsubdirs;
+ u64 i_files, i_subdirs;
+ u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
+
+ struct rb_root i_fragtree;
+ struct mutex i_fragtree_mutex;
+
+ struct ceph_inode_xattrs_info i_xattrs;
+
+ /* capabilities. protected _both_ by i_lock and cap->session's
+ * s_mutex. */
+ struct rb_root i_caps; /* cap list */
+ struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
+ unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
+ struct list_head i_dirty_item, i_sync_item;
+ wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
+ unsigned long i_hold_caps_min; /* jiffies */
+ unsigned long i_hold_caps_max; /* jiffies */
+ struct list_head i_cap_delay_list; /* for delayed cap release to mds */
+ int i_cap_exporting_mds; /* to handle cap migration between */
+ unsigned i_cap_exporting_mseq; /* mds's. */
+ unsigned i_cap_exporting_issued;
+ struct ceph_cap_reservation i_cap_migration_resv;
+ struct list_head i_cap_snaps; /* snapped state pending flush to mds */
+ struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */
+ unsigned i_snap_caps; /* cap bits for snapped files */
+
+ int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */
+
+ u32 i_truncate_seq; /* last truncate to smaller size */
+ u64 i_truncate_size; /* and the size we last truncated down to */
+ int i_truncate_pending; /* still need to call vmtruncate */
+
+ u64 i_max_size; /* max file size authorized by mds */
+ u64 i_reported_size; /* (max_)size reported to or requested of mds */
+ u64 i_wanted_max_size; /* offset we'd like to write too */
+ u64 i_requested_max_size; /* max_size we've requested */
+
+ /* held references to caps */
+ int i_pin_ref;
+ int i_rd_ref, i_rdcache_ref, i_wr_ref;
+ int i_wrbuffer_ref, i_wrbuffer_ref_head;
+ u32 i_rdcache_gen; /* we increment this each time we get RDCACHE.
+ If it's non-zero, we _may_ have cached
+ pages. */
+ u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
+
+ struct list_head i_unsafe_writes; /* uncommitted sync writes */
+ struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
+ spinlock_t i_unsafe_lock;
+
+ struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
+ int i_snap_realm_counter; /* snap realm (if caps) */
+ struct list_head i_snap_realm_item;
+ struct list_head i_snap_flush_item;
+
+ struct work_struct i_wb_work; /* writeback work */
+ struct work_struct i_pg_inv_work; /* page invalidation work */
+
+ struct work_struct i_vmtruncate_work;
+
+ struct inode vfs_inode; /* at end */
+};
+
+static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
+{
+ return list_entry(inode, struct ceph_inode_info, vfs_inode);
+}
+
+static inline void ceph_i_clear(struct inode *inode, unsigned mask)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ spin_lock(&inode->i_lock);
+ ci->i_ceph_flags &= ~mask;
+ spin_unlock(&inode->i_lock);
+}
+
+static inline void ceph_i_set(struct inode *inode, unsigned mask)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ spin_lock(&inode->i_lock);
+ ci->i_ceph_flags |= mask;
+ spin_unlock(&inode->i_lock);
+}
+
+static inline bool ceph_i_test(struct inode *inode, unsigned mask)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ bool r;
+
+ spin_lock(&inode->i_lock);
+ r = (ci->i_ceph_flags & mask) == mask;
+ spin_unlock(&inode->i_lock);
+ return r;
+}
+
+
+/* find a specific frag @f */
+static inline struct ceph_inode_frag *
+__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
+{
+ struct rb_node *n = ci->i_fragtree.rb_node;
+
+ while (n) {
+ struct ceph_inode_frag *frag =
+ rb_entry(n, struct ceph_inode_frag, node);
+ int c = frag_compare(f, frag->frag);
+ if (c < 0)
+ n = n->rb_left;
+ else if (c > 0)
+ n = n->rb_right;
+ else
+ return frag;
+ }
+ return NULL;
+}
+
+/*
+ * choose fragment for value @v. copy frag content to pfrag, if leaf
+ * exists
+ */
+extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
+ struct ceph_inode_frag *pfrag,
+ int *found);
+
+/*
+ * Ceph dentry state
+ */
+struct ceph_dentry_info {
+ struct ceph_mds_session *lease_session;
+ u32 lease_gen, lease_rdcache_gen;
+ u32 lease_seq;
+ unsigned long lease_renew_after, lease_renew_from;
+ struct list_head lru;
+ struct dentry *dentry;
+ u64 time;
+ u64 offset;
+};
+
+static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
+{
+ return (struct ceph_dentry_info *)dentry->d_fsdata;
+}
+
+static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
+{
+ return ((loff_t)frag << 32) | (loff_t)off;
+}
+
+/*
+ * ino_t is <64 bits on many architectures, blech.
+ *
+ * don't include snap in ino hash, at leaset for now.
+ */
+static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
+{
+ ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */
+#if BITS_PER_LONG == 32
+ ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
+ if (!ino)
+ ino = 1;
+#endif
+ return ino;
+}
+
+static inline int ceph_set_ino_cb(struct inode *inode, void *data)
+{
+ ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
+ inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
+ return 0;
+}
+
+static inline struct ceph_vino ceph_vino(struct inode *inode)
+{
+ return ceph_inode(inode)->i_vino;
+}
+
+/* for printf-style formatting */
+#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
+
+static inline u64 ceph_ino(struct inode *inode)
+{
+ return ceph_inode(inode)->i_vino.ino;
+}
+static inline u64 ceph_snap(struct inode *inode)
+{
+ return ceph_inode(inode)->i_vino.snap;
+}
+
+static inline int ceph_ino_compare(struct inode *inode, void *data)
+{
+ struct ceph_vino *pvino = (struct ceph_vino *)data;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ return ci->i_vino.ino == pvino->ino &&
+ ci->i_vino.snap == pvino->snap;
+}
+
+static inline struct inode *ceph_find_inode(struct super_block *sb,
+ struct ceph_vino vino)
+{
+ ino_t t = ceph_vino_to_ino(vino);
+ return ilookup5(sb, t, ceph_ino_compare, &vino);
+}
+
+
+/*
+ * caps helpers
+ */
+static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
+{
+ return !RB_EMPTY_ROOT(&ci->i_caps);
+}
+
+extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
+extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
+extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
+ struct ceph_cap *cap);
+
+static inline int ceph_caps_issued(struct ceph_inode_info *ci)
+{
+ int issued;
+ spin_lock(&ci->vfs_inode.i_lock);
+ issued = __ceph_caps_issued(ci, NULL);
+ spin_unlock(&ci->vfs_inode.i_lock);
+ return issued;
+}
+
+static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
+ int touch)
+{
+ int r;
+ spin_lock(&ci->vfs_inode.i_lock);
+ r = __ceph_caps_issued_mask(ci, mask, touch);
+ spin_unlock(&ci->vfs_inode.i_lock);
+ return r;
+}
+
+static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
+{
+ return ci->i_dirty_caps | ci->i_flushing_caps;
+}
+extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
+
+extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
+
+static inline int __ceph_caps_used(struct ceph_inode_info *ci)
+{
+ int used = 0;
+ if (ci->i_pin_ref)
+ used |= CEPH_CAP_PIN;
+ if (ci->i_rd_ref)
+ used |= CEPH_CAP_FILE_RD;
+ if (ci->i_rdcache_ref || ci->i_rdcache_gen)
+ used |= CEPH_CAP_FILE_CACHE;
+ if (ci->i_wr_ref)
+ used |= CEPH_CAP_FILE_WR;
+ if (ci->i_wrbuffer_ref)
+ used |= CEPH_CAP_FILE_BUFFER;
+ return used;
+}
+
+/*
+ * wanted, by virtue of open file modes
+ */
+static inline int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
+{
+ int want = 0;
+ int mode;
+ for (mode = 0; mode < 4; mode++)
+ if (ci->i_nr_by_mode[mode])
+ want |= ceph_caps_for_mode(mode);
+ return want;
+}
+
+/*
+ * wanted, by virtual of open file modes AND cap refs (buffered/cached data)
+ */
+static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
+{
+ int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
+ if (w & CEPH_CAP_FILE_BUFFER)
+ w |= (CEPH_CAP_FILE_EXCL); /* we want EXCL if dirty data */
+ return w;
+}
+
+/* what the mds thinks we want */
+extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
+
+extern void ceph_caps_init(void);
+extern void ceph_caps_finalize(void);
+extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need);
+extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx);
+extern void ceph_reservation_status(int *total, int *avail, int *used,
+ int *reserved);
+
+static inline struct ceph_client *ceph_inode_to_client(struct inode *inode)
+{
+ return (struct ceph_client *)inode->i_sb->s_fs_info;
+}
+
+static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb)
+{
+ return (struct ceph_client *)sb->s_fs_info;
+}
+
+static inline int ceph_queue_writeback(struct inode *inode)
+{
+ return queue_work(ceph_inode_to_client(inode)->wb_wq,
+ &ceph_inode(inode)->i_wb_work);
+}
+
+static inline int ceph_queue_page_invalidation(struct inode *inode)
+{
+ return queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
+ &ceph_inode(inode)->i_pg_inv_work);
+}
+
+
+/*
+ * keep readdir buffers attached to file->private_data
+ */
+struct ceph_file_info {
+ int fmode; /* initialized on open */
+
+ /* readdir: position within the dir */
+ u32 frag;
+ struct ceph_mds_request *last_readdir;
+ int at_end;
+
+ /* readdir: position within a frag */
+ unsigned offset; /* offset of last chunk, adjusted for . and .. */
+ u64 next_offset; /* offset of next chunk (last_name's + 1) */
+ char *last_name; /* last entry in previous chunk */
+ struct dentry *dentry; /* next dentry (for dcache readdir) */
+ unsigned long dir_release_count;
+
+ /* used for -o dirstat read() on directory thing */
+ char *dir_info;
+ int dir_info_len;
+};
+
+
+
+/*
+ * snapshots
+ */
+
+/*
+ * A "snap context" is the set of existing snapshots when we
+ * write data. It is used by the OSD to guide its COW behavior.
+ *
+ * The ceph_snap_context is refcounted, and attached to each dirty
+ * page, indicating which context the dirty data belonged when it was
+ * dirtied.
+ */
+struct ceph_snap_context {
+ atomic_t nref;
+ u64 seq;
+ int num_snaps;
+ u64 snaps[];
+};
+
+static inline struct ceph_snap_context *
+ceph_get_snap_context(struct ceph_snap_context *sc)
+{
+ /*
+ printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
+ atomic_read(&sc->nref)+1);
+ */
+ if (sc)
+ atomic_inc(&sc->nref);
+ return sc;
+}
+
+static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
+{
+ if (!sc)
+ return;
+ /*
+ printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
+ atomic_read(&sc->nref)-1);
+ */
+ if (atomic_dec_and_test(&sc->nref)) {
+ /*printk(" deleting snap_context %p\n", sc);*/
+ kfree(sc);
+ }
+}
+
+/*
+ * A "snap realm" describes a subset of the file hierarchy sharing
+ * the same set of snapshots that apply to it. The realms themselves
+ * are organized into a hierarchy, such that children inherit (some of)
+ * the snapshots of their parents.
+ *
+ * All inodes within the realm that have capabilities are linked into a
+ * per-realm list.
+ */
+struct ceph_snap_realm {
+ u64 ino;
+ atomic_t nref;
+ u64 created, seq;
+ u64 parent_ino;
+ u64 parent_since; /* snapid when our current parent became so */
+
+ u64 *prior_parent_snaps; /* snaps inherited from any parents we */
+ int num_prior_parent_snaps; /* had prior to parent_since */
+ u64 *snaps; /* snaps specific to this realm */
+ int num_snaps;
+
+ struct ceph_snap_realm *parent;
+ struct list_head children; /* list of child realms */
+ struct list_head child_item;
+
+ struct list_head empty_item; /* if i have ref==0 */
+
+ /* the current set of snaps for this realm */
+ struct ceph_snap_context *cached_context;
+
+ struct list_head inodes_with_caps;
+ spinlock_t inodes_with_caps_lock;
+};
+
+
+
+/*
+ * calculate the number of pages a given length and offset map onto,
+ * if we align the data.
+ */
+static inline int calc_pages_for(u64 off, u64 len)
+{
+ return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
+ (off >> PAGE_CACHE_SHIFT);
+}
+
+
+
+/* snap.c */
+struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
+ u64 ino);
+extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm);
+extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm);
+extern int ceph_update_snap_trace(struct ceph_mds_client *m,
+ void *p, void *e, bool deletion);
+extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
+ struct ceph_msg *msg);
+extern void ceph_queue_cap_snap(struct ceph_inode_info *ci,
+ struct ceph_snap_context *snapc);
+extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
+ struct ceph_cap_snap *capsnap);
+extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
+
+/*
+ * a cap_snap is "pending" if it is still awaiting an in-progress
+ * sync write (that may/may not still update size, mtime, etc.).
+ */
+static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
+{
+ return !list_empty(&ci->i_cap_snaps) &&
+ list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
+ ci_item)->writing;
+}
+
+
+/* super.c */
+extern const char *ceph_msg_type_name(int type);
+
+static inline __le64 __ceph_fsid_minor(ceph_fsid_t *fsid)
+{
+ return *(__le64 *)&fsid->fsid[8];
+}
+
+static inline __le64 __ceph_fsid_major(ceph_fsid_t *fsid)
+{
+ return *(__le64 *)&fsid->fsid[0];
+}
+
+static inline void __ceph_fsid_set_minor(ceph_fsid_t *fsid, __le64 val)
+{
+ *(__le64 *)&fsid->fsid[8] = val;
+}
+
+static inline void __ceph_fsid_set_major(ceph_fsid_t *fsid, __le64 val)
+{
+ *(__le64 *)&fsid->fsid[0] = val;
+}
+
+/* inode.c */
+extern const struct inode_operations ceph_file_iops;
+extern struct kmem_cache *ceph_inode_cachep;
+extern struct kmem_cache *ceph_cap_cachep;
+
+extern struct inode *ceph_alloc_inode(struct super_block *sb);
+extern void ceph_destroy_inode(struct inode *inode);
+
+extern struct inode *ceph_get_inode(struct super_block *sb,
+ struct ceph_vino vino);
+extern struct inode *ceph_get_snapdir(struct inode *parent);
+extern int ceph_fill_file_size(struct inode *inode, int issued,
+ u32 truncate_seq, u64 truncate_size, u64 size);
+extern void ceph_fill_file_time(struct inode *inode, int issued,
+ u64 time_warp_seq, struct timespec *ctime,
+ struct timespec *mtime, struct timespec *atime);
+extern int ceph_fill_trace(struct super_block *sb,
+ struct ceph_mds_request *req,
+ struct ceph_mds_session *session);
+extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
+ struct ceph_mds_session *session);
+
+extern int ceph_inode_holds_cap(struct inode *inode, int mask);
+
+extern int ceph_inode_set_size(struct inode *inode, loff_t size);
+extern void ceph_inode_writeback(struct work_struct *work);
+extern void ceph_vmtruncate_work(struct work_struct *work);
+extern void __ceph_do_pending_vmtruncate(struct inode *inode);
+extern void __ceph_queue_vmtruncate(struct inode *inode);
+
+extern int ceph_do_getattr(struct inode *inode, int mask);
+extern int ceph_permission(struct inode *inode, int mask);
+extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
+extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat);
+extern int ceph_setxattr(struct dentry *, const char *, const void *,
+ size_t, int);
+extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
+extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
+extern int ceph_removexattr(struct dentry *, const char *);
+extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci,
+ void **xattrs_blob,
+ int *blob_size);
+
+/* caps.c */
+extern const char *ceph_cap_string(int c);
+extern void ceph_handle_caps(struct ceph_mds_client *mdsc,
+ struct ceph_msg *msg);
+extern int ceph_add_cap(struct inode *inode,
+ struct ceph_mds_session *session, u64 cap_id,
+ int fmode, unsigned issued, unsigned wanted,
+ unsigned cap, unsigned seq, u64 realmino,
+ unsigned ttl_ms, unsigned long ttl_from, int flags,
+ struct ceph_cap_reservation *caps_reservation);
+extern void __ceph_remove_cap(struct ceph_cap *cap,
+ struct ceph_cap_reservation *ctx);
+static inline void ceph_remove_cap(struct ceph_cap *cap)
+{
+ struct inode *inode = &cap->ci->vfs_inode;
+ spin_lock(&inode->i_lock);
+ __ceph_remove_cap(cap, NULL);
+ spin_unlock(&inode->i_lock);
+}
+
+extern void ceph_queue_caps_release(struct inode *inode);
+extern int ceph_write_inode(struct inode *inode, int unused);
+extern int ceph_get_cap_mds(struct inode *inode);
+extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
+extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
+extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
+ struct ceph_snap_context *snapc);
+extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
+ struct ceph_mds_session **psession);
+extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
+ struct ceph_mds_session *session);
+extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
+
+extern int ceph_encode_inode_release(void **p, struct inode *inode,
+ int mds, int drop, int unless, int force);
+extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
+ int mds, int drop, int unless);
+
+extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
+ int *got, loff_t endoff);
+
+/* for counting open files by mode */
+static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
+{
+ ci->i_nr_by_mode[mode]++;
+}
+extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
+
+/* addr.c */
+extern const struct address_space_operations ceph_aops;
+extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
+
+/* file.c */
+extern const struct file_operations ceph_file_fops;
+extern const struct address_space_operations ceph_aops;
+extern int ceph_open(struct inode *inode, struct file *file);
+extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd, int mode,
+ int locked_dir);
+extern int ceph_release(struct inode *inode, struct file *filp);
+extern void ceph_release_page_vector(struct page **pages, int num_pages);
+
+/* dir.c */
+extern const struct file_operations ceph_dir_fops;
+extern const struct inode_operations ceph_dir_iops;
+extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
+ ceph_snapdir_dentry_ops;
+
+extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
+extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
+ struct dentry *dentry, int err);
+
+extern void ceph_dentry_lru_add(struct dentry *dn);
+extern void ceph_dentry_lru_touch(struct dentry *dn);
+extern void ceph_dentry_lru_del(struct dentry *dn);
+
+/*
+ * our d_ops vary depending on whether the inode is live,
+ * snapshotted (read-only), or a virtual ".snap" directory.
+ */
+int ceph_init_dentry_private(struct dentry *dentry);
+
+static inline int ceph_init_dentry(struct dentry *dentry)
+{
+ int ret;
+
+ if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
+ dentry->d_op = &ceph_dentry_ops;
+ else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
+ dentry->d_op = &ceph_snapdir_dentry_ops;
+ else
+ dentry->d_op = &ceph_snap_dentry_ops;
+
+ ret = ceph_init_dentry_private(dentry);
+
+ return ret;
+}
+
+/* ioctl.c */
+extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+
+/* export.c */
+extern const struct export_operations ceph_export_ops;
+
+/* debugfs.c */
+extern int ceph_debugfs_init(void);
+extern void ceph_debugfs_cleanup(void);
+extern int ceph_debugfs_client_init(struct ceph_client *client);
+extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
+
+static inline struct inode *get_dentry_parent_inode(struct dentry *dentry)
+{
+ if (dentry && dentry->d_parent)
+ return dentry->d_parent->d_inode;
+
+ return NULL;
+}
+
+#endif /* _FS_CEPH_SUPER_H */
diff --git a/fs/staging/ceph/types.h b/fs/staging/ceph/types.h
new file mode 100644
index 0000000..b6fd837
--- /dev/null
+++ b/fs/staging/ceph/types.h
@@ -0,0 +1,27 @@
+#ifndef _FS_CEPH_TYPES_H
+#define _FS_CEPH_TYPES_H
+
+/* needed before including ceph_fs.h */
+#include <linux/in.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/string.h>
+
+#include "ceph_fs.h"
+
+/*
+ * Identify inodes by both their ino and snapshot id (a u64).
+ */
+struct ceph_vino {
+ u64 ino;
+ u64 snap;
+};
+
+
+/* context for the caps reservation mechanism */
+struct ceph_cap_reservation {
+ int count;
+};
+
+
+#endif
--
1.5.6.5
--
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