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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@newdream.net>
This commit is contained in:
Sage Weil 2009-10-06 11:31:07 -07:00
parent 0dee3c28af
commit de57606c23
6 changed files with 1091 additions and 0 deletions
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37
fs/ceph/ceph_debug.h Normal file
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#ifndef _FS_CEPH_DEBUG_H
#define _FS_CEPH_DEBUG_H
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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

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fs/ceph/ceph_frag.c Normal file
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/*
* Ceph 'frag' type
*/
#include "types.h"
int ceph_frag_compare(__u32 a, __u32 b)
{
unsigned va = ceph_frag_value(a);
unsigned vb = ceph_frag_value(b);
if (va < vb)
return -1;
if (va > vb)
return 1;
va = ceph_frag_bits(a);
vb = ceph_frag_bits(b);
if (va < vb)
return -1;
if (va > vb)
return 1;
return 0;
}

109
fs/ceph/ceph_frag.h Normal file
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#ifndef _FS_CEPH_FRAG_H
#define _FS_CEPH_FRAG_H
/*
* "Frags" are a way to describe a subset of a 32-bit number space,
* using a mask and a value to match against that mask. Any given frag
* (subset of the number space) can be partitioned into 2^n sub-frags.
*
* Frags are encoded into a 32-bit word:
* 8 upper bits = "bits"
* 24 lower bits = "value"
* (We could go to 5+27 bits, but who cares.)
*
* We use the _most_ significant bits of the 24 bit value. This makes
* values logically sort.
*
* Unfortunately, because the "bits" field is still in the high bits, we
* can't sort encoded frags numerically. However, it does allow you
* to feed encoded frags as values into frag_contains_value.
*/
static inline __u32 ceph_frag_make(__u32 b, __u32 v)
{
return (b << 24) |
(v & (0xffffffu << (24-b)) & 0xffffffu);
}
static inline __u32 ceph_frag_bits(__u32 f)
{
return f >> 24;
}
static inline __u32 ceph_frag_value(__u32 f)
{
return f & 0xffffffu;
}
static inline __u32 ceph_frag_mask(__u32 f)
{
return (0xffffffu << (24-ceph_frag_bits(f))) & 0xffffffu;
}
static inline __u32 ceph_frag_mask_shift(__u32 f)
{
return 24 - ceph_frag_bits(f);
}
static inline int ceph_frag_contains_value(__u32 f, __u32 v)
{
return (v & ceph_frag_mask(f)) == ceph_frag_value(f);
}
static inline int ceph_frag_contains_frag(__u32 f, __u32 sub)
{
/* is sub as specific as us, and contained by us? */
return ceph_frag_bits(sub) >= ceph_frag_bits(f) &&
(ceph_frag_value(sub) & ceph_frag_mask(f)) == ceph_frag_value(f);
}
static inline __u32 ceph_frag_parent(__u32 f)
{
return ceph_frag_make(ceph_frag_bits(f) - 1,
ceph_frag_value(f) & (ceph_frag_mask(f) << 1));
}
static inline int ceph_frag_is_left_child(__u32 f)
{
return ceph_frag_bits(f) > 0 &&
(ceph_frag_value(f) & (0x1000000 >> ceph_frag_bits(f))) == 0;
}
static inline int ceph_frag_is_right_child(__u32 f)
{
return ceph_frag_bits(f) > 0 &&
(ceph_frag_value(f) & (0x1000000 >> ceph_frag_bits(f))) == 1;
}
static inline __u32 ceph_frag_sibling(__u32 f)
{
return ceph_frag_make(ceph_frag_bits(f),
ceph_frag_value(f) ^ (0x1000000 >> ceph_frag_bits(f)));
}
static inline __u32 ceph_frag_left_child(__u32 f)
{
return ceph_frag_make(ceph_frag_bits(f)+1, ceph_frag_value(f));
}
static inline __u32 ceph_frag_right_child(__u32 f)
{
return ceph_frag_make(ceph_frag_bits(f)+1,
ceph_frag_value(f) | (0x1000000 >> (1+ceph_frag_bits(f))));
}
static inline __u32 ceph_frag_make_child(__u32 f, int by, int i)
{
int newbits = ceph_frag_bits(f) + by;
return ceph_frag_make(newbits,
ceph_frag_value(f) | (i << (24 - newbits)));
}
static inline int ceph_frag_is_leftmost(__u32 f)
{
return ceph_frag_value(f) == 0;
}
static inline int ceph_frag_is_rightmost(__u32 f)
{
return ceph_frag_value(f) == ceph_frag_mask(f);
}
static inline __u32 ceph_frag_next(__u32 f)
{
return ceph_frag_make(ceph_frag_bits(f),
ceph_frag_value(f) + (0x1000000 >> ceph_frag_bits(f)));
}
/*
* comparator to sort frags logically, as when traversing the
* number space in ascending order...
*/
int ceph_frag_compare(__u32 a, __u32 b);
#endif

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fs/ceph/ceph_ver.h Normal file
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#ifndef __CEPH_VERSION_H
#define __CEPH_VERSION_H
#define CEPH_GIT_VER 335cd8f952b457095ea2a66aee3db50efb63c91d
#endif

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#ifndef _FS_CEPH_SUPER_H
#define _FS_CEPH_SUPER_H
#include "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 "types.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;
smp_mb();
r = (ci->i_ceph_flags & mask) == mask;
return r;
}
/* 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);
/*
* 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);
extern int __ceph_caps_used(struct ceph_inode_info *ci);
extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
/*
* 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);
/* xattr.c */
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);
extern void __ceph_destroy_xattrs(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, 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(struct dentry *dentry);
/* 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 */

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fs/ceph/types.h Normal file
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#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"
#include "ceph_frag.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