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    Subject[PATCH 03/21] ceph: client types
    Date
    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@newdream.net>
    ---
    fs/ceph/ceph_debug.h | 35 ++
    fs/ceph/ceph_ver.h | 6 +
    fs/ceph/super.h | 945 ++++++++++++++++++++++++++++++++++++++++++++++++++
    fs/ceph/types.h | 27 ++
    4 files changed, 1013 insertions(+), 0 deletions(-)
    create mode 100644 fs/ceph/ceph_debug.h
    create mode 100644 fs/ceph/ceph_ver.h
    create mode 100644 fs/ceph/super.h
    create mode 100644 fs/ceph/types.h

    diff --git a/fs/ceph/ceph_debug.h b/fs/ceph/ceph_debug.h
    new file mode 100644
    index 0000000..be9b8bc
    --- /dev/null
    +++ b/fs/ceph/ceph_debug.h
    @@ -0,0 +1,35 @@
    +#ifndef _FS_CEPH_DEBUG_H
    +#define _FS_CEPH_DEBUG_H
    +
    +#ifdef CONFIG_CEPH_FS_PRETTYDEBUG
    +
    +/*
    + * wrap pr_debug to include a filename:lineno prefix on each line.
    + * this incurs some overhead (kernel size and execution time) due to
    + * the extra function call at each call site.
    + */
    +
    +# if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
    +extern const char *ceph_file_part(const char *s, int len);
    +# define dout(fmt, ...) \
    + pr_debug(" %12.12s:%-4d : " fmt, \
    + ceph_file_part(__FILE__, sizeof(__FILE__)), \
    + __LINE__, ##__VA_ARGS__)
    +# else
    +/* faux printk call just to see any compiler warnings. */
    +# define dout(fmt, ...) do { \
    + if (0) \
    + printk(KERN_DEBUG fmt, ##__VA_ARGS__); \
    + } while (0)
    +# endif
    +
    +#else
    +
    +/*
    + * or, just wrap pr_debug
    + */
    +# define dout(fmt, ...) pr_debug(" " fmt, ##__VA_ARGS__)
    +
    +#endif
    +
    +#endif
    diff --git a/fs/ceph/ceph_ver.h b/fs/ceph/ceph_ver.h
    new file mode 100644
    index 0000000..d660a23
    --- /dev/null
    +++ b/fs/ceph/ceph_ver.h
    @@ -0,0 +1,6 @@
    +#ifndef __CEPH_VERSION_H
    +#define __CEPH_VERSION_H
    +
    +#define CEPH_GIT_VER c6e5d6e43206b0d3b1434a002fffe746d22bf911
    +
    +#endif
    diff --git a/fs/ceph/super.h b/fs/ceph/super.h
    new file mode 100644
    index 0000000..2753b10
    --- /dev/null
    +++ b/fs/ceph/super.h
    @@ -0,0 +1,945 @@
    +#ifndef _FS_CEPH_SUPER_H
    +#define _FS_CEPH_SUPER_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 "types.h"
    +#include "ceph_debug.h"
    +#include "messenger.h"
    +#include "msgpool.h"
    +#include "mon_client.h"
    +#include "mds_client.h"
    +#include "osd_client.h"
    +#include "ceph_fs.h"
    +
    +/* f_type in struct statfs */
    +#define CEPH_SUPER_MAGIC 0x00c36400
    +
    +/* large granularity for statfs utilization stats to facilitate
    + * large volume sizes on 32-bit machines. */
    +#define CEPH_BLOCK_SHIFT 20 /* 1 MB */
    +#define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT)
    +
    +/*
    + * mount options
    + */
    +#define CEPH_OPT_FSID (1<<0)
    +#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
    +#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
    +#define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */
    +#define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
    +#define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */
    +#define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
    +
    +#define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES)
    +
    +#define ceph_set_opt(client, opt) \
    + (client)->mount_args.flags |= CEPH_OPT_##opt;
    +#define ceph_test_opt(client, opt) \
    + (!!((client)->mount_args.flags & CEPH_OPT_##opt))
    +
    +
    +#define CEPH_MAX_MON_MOUNT_ADDR 5
    +
    +struct ceph_mount_args {
    + int sb_flags;
    + int flags;
    + int mount_timeout;
    + int caps_wanted_delay_min, caps_wanted_delay_max;
    + struct ceph_fsid fsid;
    + struct ceph_entity_addr my_addr;
    + int wsize;
    + int rsize; /* max readahead */
    + int max_readdir; /* max readdir size */
    + int osd_timeout;
    + char *snapdir_name; /* default ".snap" */
    + char *secret;
    + int cap_release_safety;
    +};
    +
    +/*
    + * defaults
    + */
    +#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
    +#define CEPH_MOUNT_RSIZE_DEFAULT (128*1024) /* readahead */
    +
    +#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
    +#define CEPH_MSG_MAX_DATA_LEN (16*1024*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 */
    +
    +
    +/* mount state */
    +enum {
    + CEPH_MOUNT_MOUNTING,
    + CEPH_MOUNT_MOUNTED,
    + CEPH_MOUNT_UNMOUNTING,
    + CEPH_MOUNT_UNMOUNTED,
    + CEPH_MOUNT_SHUTDOWN,
    +};
    +
    +/*
    + * subtract jiffies
    + */
    +static inline unsigned long time_sub(unsigned long a, unsigned long b)
    +{
    + BUG_ON(time_after(b, a));
    + return (long)a - (long)b;
    +}
    +
    +/*
    + * per-filesystem client state
    + *
    + * possibly shared by multiple mount points, if they are
    + * mounting the same ceph filesystem/cluster.
    + */
    +struct ceph_client {
    + __s64 whoami; /* my client number */
    + struct dentry *debugfs_monmap;
    + struct dentry *debugfs_mdsmap, *debugfs_osdmap;
    + struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
    +
    + struct mutex mount_mutex; /* serialize mount attempts */
    + struct ceph_mount_args mount_args;
    + struct ceph_fsid 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 */
    + mempool_t *wb_pagevec_pool;
    + 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 cache or writeback attributes or to read
    + * and write data. For any given inode, we should have one or more
    + * capabilities, one issued by each metadata server, and our
    + * cumulative access is the OR of all issued capabilities.
    + *
    + * Each cap is referenced by the inode's i_caps rbtree and by per-mds
    + * session capability lists.
    + */
    +struct ceph_cap {
    + struct ceph_inode_info *ci;
    + struct rb_node ci_node; /* per-ci cap tree */
    + struct ceph_mds_session *session;
    + struct list_head session_caps; /* per-session caplist */
    + int mds;
    + u64 cap_id; /* unique cap id (mds provided) */
    + int issued; /* latest, from the mds */
    + int implemented; /* implemented superset of issued (for revocation) */
    + int mds_wanted;
    + u32 seq, issue_seq, mseq, 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 */
    +#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
    +
    +/*
    + * Snapped cap state that is pending flush to mds. When a snapshot occurs,
    + * we first complete any in-process sync writes and writeback any dirty
    + * data before flushing the snapped state (tracked here) back to the MDS.
    + */
    +struct ceph_cap_snap {
    + atomic_t nref;
    + struct ceph_inode_info *ci;
    + struct list_head ci_item, flushing_item;
    +
    + u64 follows, flush_tid;
    + int issued, dirty;
    + struct ceph_snap_context *context;
    +
    + mode_t mode;
    + uid_t uid;
    + gid_t gid;
    +
    + void *xattr_blob;
    + int xattr_len;
    + u64 xattr_version;
    +
    + u64 size;
    + struct timespec mtime, atime, ctime;
    + u64 time_warp_seq;
    + int writing; /* a sync write is still in progress */
    + int dirty_pages; /* dirty pages awaiting writeback */
    +};
    +
    +static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
    +{
    + if (atomic_dec_and_test(&capsnap->nref))
    + kfree(capsnap);
    +}
    +
    +/*
    + * The frag tree describes how a directory is fragmented, potentially across
    + * multiple metadata servers. It is also used to indicate points where
    + * metadata authority is delegated, and whether/where metadata is replicated.
    + *
    + * A _leaf_ frag will be present in the i_fragtree IFF there is
    + * delegation info. That is, if mds >= 0 || ndist > 0.
    + */
    +#define CEPH_MAX_DIRFRAG_REP 4
    +
    +struct ceph_inode_frag {
    + struct rb_node node;
    +
    + /* fragtree state */
    + u32 frag;
    + int split_by; /* i.e. 2^(split_by) children */
    +
    + /* delegation and replication info */
    + int mds; /* -1 if same authority as parent */
    + int ndist; /* >0 if replicated */
    + int dist[CEPH_MAX_DIRFRAG_REP];
    +};
    +
    +/*
    + * We cache inode xattrs as an encoded blob until they are first used,
    + * at which point we parse them into an rbtree.
    + */
    +struct ceph_inode_xattr {
    + struct rb_node node;
    +
    + const char *name;
    + int name_len;
    + const char *val;
    + int val_len;
    + int dirty;
    +
    + int should_free_name;
    + int should_free_val;
    +};
    +
    +struct ceph_inode_xattrs_info {
    + /*
    + * (still encoded) xattr blob. we avoid the overhead of parsing
    + * this until someone actually calls getxattr, etc.
    + *
    + * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
    + * NULL means we don't know.
    + */
    + struct ceph_buffer *blob, *prealloc_blob;
    +
    + struct rb_root index;
    + bool dirty;
    + int count;
    + int names_size;
    + int vals_size;
    + u64 version, index_version;
    +};
    +
    +/*
    + * Ceph inode.
    + */
    +#define CEPH_I_COMPLETE 1 /* we have complete directory cached */
    +#define CEPH_I_NODELAY 4 /* do not delay cap release */
    +#define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */
    +
    +struct ceph_inode_info {
    + struct ceph_vino i_vino; /* ceph ino + snap */
    +
    + u64 i_version;
    + u32 i_time_warp_seq;
    +
    + unsigned i_ceph_flags;
    + unsigned long i_release_count;
    +
    + struct ceph_file_layout i_layout;
    + char *i_symlink;
    +
    + /* for dirs */
    + struct timespec i_rctime;
    + u64 i_rbytes, i_rfiles, i_rsubdirs;
    + u64 i_files, i_subdirs;
    + u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
    +
    + struct rb_root i_fragtree;
    + struct mutex i_fragtree_mutex;
    +
    + struct ceph_inode_xattrs_info i_xattrs;
    +
    + /* capabilities. protected _both_ by i_lock and cap->session's
    + * s_mutex. */
    + struct rb_root i_caps; /* cap list */
    + struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
    + unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
    + struct list_head i_dirty_item, i_flushing_item;
    + u64 i_cap_flush_seq;
    + /* we need to track cap writeback on a per-cap-bit basis, to allow
    + * overlapping, pipelined cap flushes to the mds. we can probably
    + * reduce the tid to 8 bits if we're concerned about inode size. */
    + u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
    + wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
    + unsigned long i_hold_caps_min; /* jiffies */
    + unsigned long i_hold_caps_max; /* jiffies */
    + struct list_head i_cap_delay_list; /* for delayed cap release to mds */
    + int i_cap_exporting_mds; /* to handle cap migration between */
    + unsigned i_cap_exporting_mseq; /* mds's. */
    + unsigned i_cap_exporting_issued;
    + struct ceph_cap_reservation i_cap_migration_resv;
    + struct list_head i_cap_snaps; /* snapped state pending flush to mds */
    + struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */
    + unsigned i_snap_caps; /* cap bits for snapped files */
    +
    + int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */
    +
    + u32 i_truncate_seq; /* last truncate to smaller size */
    + u64 i_truncate_size; /* and the size we last truncated down to */
    + int i_truncate_pending; /* still need to call vmtruncate */
    +
    + u64 i_max_size; /* max file size authorized by mds */
    + u64 i_reported_size; /* (max_)size reported to or requested of mds */
    + u64 i_wanted_max_size; /* offset we'd like to write too */
    + u64 i_requested_max_size; /* max_size we've requested */
    +
    + /* held references to caps */
    + int i_pin_ref;
    + int i_rd_ref, i_rdcache_ref, i_wr_ref;
    + int i_wrbuffer_ref, i_wrbuffer_ref_head;
    + u32 i_shared_gen; /* increment each time we get FILE_SHARED */
    + u32 i_rdcache_gen; /* we increment this each time we get
    + FILE_CACHE. If it's non-zero, we
    + _may_ have cached pages. */
    + u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
    +
    + struct list_head i_unsafe_writes; /* uncommitted sync writes */
    + struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
    + spinlock_t i_unsafe_lock;
    +
    + struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
    + int i_snap_realm_counter; /* snap realm (if caps) */
    + struct list_head i_snap_realm_item;
    + struct list_head i_snap_flush_item;
    +
    + struct work_struct i_wb_work; /* writeback work */
    + struct work_struct i_pg_inv_work; /* page invalidation work */
    +
    + struct work_struct i_vmtruncate_work;
    +
    + struct inode vfs_inode; /* at end */
    +};
    +
    +static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
    +{
    + return 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_shared_gen;
    + u32 lease_seq;
    + unsigned long lease_renew_after, lease_renew_from;
    + struct list_head lru;
    + struct dentry *dentry;
    + u64 time;
    + u64 offset;
    +};
    +
    +static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
    +{
    + return (struct ceph_dentry_info *)dentry->d_fsdata;
    +}
    +
    +static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
    +{
    + return ((loff_t)frag << 32) | (loff_t)off;
    +}
    +
    +/*
    + * ino_t is <64 bits on many architectures, blech.
    + *
    + * don't include snap in ino hash, at least for now.
    + */
    +static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
    +{
    + ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */
    +#if BITS_PER_LONG == 32
    + ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
    + if (!ino)
    + ino = 1;
    +#endif
    + return ino;
    +}
    +
    +static inline int ceph_set_ino_cb(struct inode *inode, void *data)
    +{
    + ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
    + inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
    + return 0;
    +}
    +
    +static inline struct ceph_vino ceph_vino(struct inode *inode)
    +{
    + return ceph_inode(inode)->i_vino;
    +}
    +
    +/* for printf-style formatting */
    +#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
    +
    +static inline u64 ceph_ino(struct inode *inode)
    +{
    + return ceph_inode(inode)->i_vino.ino;
    +}
    +static inline u64 ceph_snap(struct inode *inode)
    +{
    + return ceph_inode(inode)->i_vino.snap;
    +}
    +
    +static inline int ceph_ino_compare(struct inode *inode, void *data)
    +{
    + struct ceph_vino *pvino = (struct ceph_vino *)data;
    + struct ceph_inode_info *ci = ceph_inode(inode);
    + return ci->i_vino.ino == pvino->ino &&
    + ci->i_vino.snap == pvino->snap;
    +}
    +
    +static inline struct inode *ceph_find_inode(struct super_block *sb,
    + struct ceph_vino vino)
    +{
    + ino_t t = ceph_vino_to_ino(vino);
    + return ilookup5(sb, t, ceph_ino_compare, &vino);
    +}
    +
    +
    +/*
    + * caps helpers
    + */
    +static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
    +{
    + return !RB_EMPTY_ROOT(&ci->i_caps);
    +}
    +
    +extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
    +extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
    +extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
    + struct ceph_cap *cap);
    +
    +static inline int ceph_caps_issued(struct ceph_inode_info *ci)
    +{
    + int issued;
    + spin_lock(&ci->vfs_inode.i_lock);
    + issued = __ceph_caps_issued(ci, NULL);
    + spin_unlock(&ci->vfs_inode.i_lock);
    + return issued;
    +}
    +
    +static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
    + int touch)
    +{
    + int r;
    + spin_lock(&ci->vfs_inode.i_lock);
    + r = __ceph_caps_issued_mask(ci, mask, touch);
    + spin_unlock(&ci->vfs_inode.i_lock);
    + return r;
    +}
    +
    +static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
    +{
    + return ci->i_dirty_caps | ci->i_flushing_caps;
    +}
    +extern 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 virtue of open file modes AND cap refs (buffered/cached data)
    + */
    +static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
    +{
    + int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
    + if (w & CEPH_CAP_FILE_BUFFER)
    + w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */
    + return w;
    +}
    +
    +/* what the mds thinks we want */
    +extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
    +
    +extern void ceph_caps_init(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(struct ceph_client *client,
    + 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);
    +}
    +
    +
    +/*
    + * we keep buffered readdir results attached to file->private_data
    + */
    +struct ceph_file_info {
    + int fmode; /* initialized on open */
    +
    + /* readdir: position within the dir */
    + u32 frag;
    + struct ceph_mds_request *last_readdir;
    + int at_end;
    +
    + /* readdir: position within a frag */
    + unsigned offset; /* offset of last chunk, adjusted for . and .. */
    + u64 next_offset; /* offset of next chunk (last_name's + 1) */
    + char *last_name; /* last entry in previous chunk */
    + struct dentry *dentry; /* next dentry (for dcache readdir) */
    + unsigned long dir_release_count;
    +
    + /* used for -o dirstat read() on directory thing */
    + char *dir_info;
    + int dir_info_len;
    +};
    +
    +
    +
    +/*
    + * snapshots
    + */
    +
    +/*
    + * A "snap context" is the set of existing snapshots when we
    + * write data. It is used by the OSD to guide its COW behavior.
    + *
    + * The ceph_snap_context is refcounted, and attached to each dirty
    + * page, indicating which context the dirty data belonged when it was
    + * dirtied.
    + */
    +struct ceph_snap_context {
    + atomic_t nref;
    + u64 seq;
    + int num_snaps;
    + u64 snaps[];
    +};
    +
    +static inline struct ceph_snap_context *
    +ceph_get_snap_context(struct ceph_snap_context *sc)
    +{
    + /*
    + printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
    + atomic_read(&sc->nref)+1);
    + */
    + if (sc)
    + atomic_inc(&sc->nref);
    + return sc;
    +}
    +
    +static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
    +{
    + if (!sc)
    + return;
    + /*
    + printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
    + atomic_read(&sc->nref)-1);
    + */
    + if (atomic_dec_and_test(&sc->nref)) {
    + /*printk(" deleting snap_context %p\n", sc);*/
    + kfree(sc);
    + }
    +}
    +
    +/*
    + * A "snap realm" describes a subset of the file hierarchy sharing
    + * the same set of snapshots that apply to it. The realms themselves
    + * are organized into a hierarchy, such that children inherit (some of)
    + * the snapshots of their parents.
    + *
    + * All inodes within the realm that have capabilities are linked into a
    + * per-realm list.
    + */
    +struct ceph_snap_realm {
    + u64 ino;
    + atomic_t nref;
    + 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 struct kmem_cache *ceph_inode_cachep;
    +extern struct kmem_cache *ceph_cap_cachep;
    +extern struct kmem_cache *ceph_dentry_cachep;
    +extern struct kmem_cache *ceph_file_cachep;
    +
    +extern const char *ceph_msg_type_name(int type);
    +
    +#define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
    + "%02x%02x%02x%02x%02x%02x"
    +#define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \
    + (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \
    + (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \
    + (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15]
    +
    +/* inode.c */
    +extern const struct inode_operations ceph_file_iops;
    +
    +extern struct inode *ceph_alloc_inode(struct super_block *sb);
    +extern void ceph_destroy_inode(struct inode *inode);
    +
    +extern struct inode *ceph_get_inode(struct super_block *sb,
    + struct ceph_vino vino);
    +extern struct inode *ceph_get_snapdir(struct inode *parent);
    +extern int ceph_fill_file_size(struct inode *inode, int issued,
    + u32 truncate_seq, u64 truncate_size, u64 size);
    +extern void ceph_fill_file_time(struct inode *inode, int issued,
    + u64 time_warp_seq, struct timespec *ctime,
    + struct timespec *mtime, struct timespec *atime);
    +extern int ceph_fill_trace(struct super_block *sb,
    + struct ceph_mds_request *req,
    + struct ceph_mds_session *session);
    +extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
    + struct ceph_mds_session *session);
    +
    +extern int ceph_inode_holds_cap(struct inode *inode, int mask);
    +
    +extern int ceph_inode_set_size(struct inode *inode, loff_t size);
    +extern void ceph_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);
    +
    +/* caps.c */
    +extern const char *ceph_cap_string(int c);
    +extern void ceph_handle_caps(struct ceph_mds_session *session,
    + struct ceph_msg *msg);
    +extern int ceph_add_cap(struct inode *inode,
    + struct ceph_mds_session *session, u64 cap_id,
    + int fmode, unsigned issued, unsigned wanted,
    + unsigned cap, unsigned seq, u64 realmino,
    + 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_fsync(struct file *file, struct dentry *dentry, int datasync);
    +extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
    + struct ceph_mds_session *session);
    +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,
    + int flushdirty);
    +
    +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/ceph/types.h b/fs/ceph/types.h
    new file mode 100644
    index 0000000..c363183
    --- /dev/null
    +++ b/fs/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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