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ceph: OSD client
The OSD client is responsible for reading and writing data from/to the object storage pool. This includes determining where objects are stored in the cluster, and ensuring that requests are retried or redirected in the event of a node failure or data migration. If an OSD does not respond before a timeout expires, keepalive messages are sent across the lossless, ordered communications channel to ensure that any break in the TCP is discovered. If the session does reset, a reconnection is attempted and affected requests are resent (by the message transport layer). Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
1294
fs/ceph/osd_client.c
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1294
fs/ceph/osd_client.c
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File diff suppressed because it is too large
Load Diff
144
fs/ceph/osd_client.h
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144
fs/ceph/osd_client.h
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#ifndef _FS_CEPH_OSD_CLIENT_H
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#define _FS_CEPH_OSD_CLIENT_H
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#include <linux/completion.h>
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#include <linux/mempool.h>
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#include <linux/rbtree.h>
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#include "types.h"
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#include "osdmap.h"
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#include "messenger.h"
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struct ceph_msg;
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struct ceph_snap_context;
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struct ceph_osd_request;
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struct ceph_osd_client;
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/*
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* completion callback for async writepages
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*/
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typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
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struct ceph_msg *);
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/* a given osd we're communicating with */
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struct ceph_osd {
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atomic_t o_ref;
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struct ceph_osd_client *o_osdc;
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int o_osd;
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int o_incarnation;
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struct rb_node o_node;
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struct ceph_connection o_con;
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struct list_head o_requests;
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};
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/* an in-flight request */
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struct ceph_osd_request {
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u64 r_tid; /* unique for this client */
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struct rb_node r_node;
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struct list_head r_osd_item;
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struct ceph_osd *r_osd;
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struct ceph_msg *r_request, *r_reply;
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int r_result;
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int r_flags; /* any additional flags for the osd */
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u32 r_sent; /* >0 if r_request is sending/sent */
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int r_prepared_pages, r_got_reply;
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struct ceph_osd_client *r_osdc;
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atomic_t r_ref;
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bool r_mempool;
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struct completion r_completion, r_safe_completion;
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ceph_osdc_callback_t r_callback, r_safe_callback;
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struct ceph_eversion r_reassert_version;
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struct list_head r_unsafe_item;
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struct inode *r_inode; /* for use by callbacks */
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struct writeback_control *r_wbc; /* ditto */
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char r_oid[40]; /* object name */
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int r_oid_len;
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unsigned long r_timeout_stamp;
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bool r_resend; /* msg send failed, needs retry */
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struct ceph_file_layout r_file_layout;
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struct ceph_snap_context *r_snapc; /* snap context for writes */
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unsigned r_num_pages; /* size of page array (follows) */
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struct page **r_pages; /* pages for data payload */
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int r_pages_from_pool;
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int r_own_pages; /* if true, i own page list */
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};
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struct ceph_osd_client {
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struct ceph_client *client;
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struct ceph_osdmap *osdmap; /* current map */
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struct rw_semaphore map_sem;
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struct completion map_waiters;
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u64 last_requested_map;
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struct mutex request_mutex;
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struct rb_root osds; /* osds */
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u64 timeout_tid; /* tid of timeout triggering rq */
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u64 last_tid; /* tid of last request */
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struct rb_root requests; /* pending requests */
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int num_requests;
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struct delayed_work timeout_work;
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struct dentry *debugfs_file;
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mempool_t *req_mempool;
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struct ceph_msgpool msgpool_op;
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struct ceph_msgpool msgpool_op_reply;
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};
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extern int ceph_osdc_init(struct ceph_osd_client *osdc,
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struct ceph_client *client);
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extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
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extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
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struct ceph_msg *msg);
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extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
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struct ceph_msg *msg);
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extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
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struct ceph_file_layout *layout,
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struct ceph_vino vino,
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u64 offset, u64 *len, int op, int flags,
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struct ceph_snap_context *snapc,
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int do_sync, u32 truncate_seq,
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u64 truncate_size,
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struct timespec *mtime,
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bool use_mempool, int num_reply);
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static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
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{
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atomic_inc(&req->r_ref);
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}
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extern void ceph_osdc_put_request(struct ceph_osd_request *req);
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extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
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struct ceph_osd_request *req,
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bool nofail);
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extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
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struct ceph_osd_request *req);
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extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
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extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
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struct ceph_vino vino,
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struct ceph_file_layout *layout,
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u64 off, u64 *plen,
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u32 truncate_seq, u64 truncate_size,
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struct page **pages, int nr_pages);
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extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
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struct ceph_vino vino,
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struct ceph_file_layout *layout,
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struct ceph_snap_context *sc,
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u64 off, u64 len,
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u32 truncate_seq, u64 truncate_size,
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struct timespec *mtime,
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struct page **pages, int nr_pages,
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int flags, int do_sync, bool nofail);
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#endif
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875
fs/ceph/osdmap.c
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875
fs/ceph/osdmap.c
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File diff suppressed because it is too large
Load Diff
123
fs/ceph/osdmap.h
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123
fs/ceph/osdmap.h
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@@ -0,0 +1,123 @@
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#ifndef _FS_CEPH_OSDMAP_H
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#define _FS_CEPH_OSDMAP_H
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#include <linux/rbtree.h>
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#include "types.h"
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#include "ceph_fs.h"
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#include "crush/crush.h"
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/*
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* The osd map describes the current membership of the osd cluster and
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* specifies the mapping of objects to placement groups and placement
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* groups to (sets of) osds. That is, it completely specifies the
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* (desired) distribution of all data objects in the system at some
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* point in time.
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*
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* Each map version is identified by an epoch, which increases monotonically.
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*
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* The map can be updated either via an incremental map (diff) describing
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* the change between two successive epochs, or as a fully encoded map.
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*/
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struct ceph_pg_pool_info {
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struct ceph_pg_pool v;
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int pg_num_mask, pgp_num_mask, lpg_num_mask, lpgp_num_mask;
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};
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struct ceph_pg_mapping {
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struct rb_node node;
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u64 pgid;
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int len;
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int osds[];
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};
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struct ceph_osdmap {
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struct ceph_fsid fsid;
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u32 epoch;
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u32 mkfs_epoch;
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struct ceph_timespec created, modified;
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u32 flags; /* CEPH_OSDMAP_* */
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u32 max_osd; /* size of osd_state, _offload, _addr arrays */
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u8 *osd_state; /* CEPH_OSD_* */
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u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */
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struct ceph_entity_addr *osd_addr;
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struct rb_root pg_temp;
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u32 num_pools;
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struct ceph_pg_pool_info *pg_pool;
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/* the CRUSH map specifies the mapping of placement groups to
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* the list of osds that store+replicate them. */
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struct crush_map *crush;
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};
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/*
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* file layout helpers
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*/
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#define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
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#define ceph_file_layout_stripe_count(l) \
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((__s32)le32_to_cpu((l).fl_stripe_count))
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#define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
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#define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
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#define ceph_file_layout_object_su(l) \
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((__s32)le32_to_cpu((l).fl_object_stripe_unit))
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#define ceph_file_layout_pg_preferred(l) \
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((__s32)le32_to_cpu((l).fl_pg_preferred))
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#define ceph_file_layout_pg_pool(l) \
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((__s32)le32_to_cpu((l).fl_pg_pool))
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static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
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{
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return le32_to_cpu(l->fl_stripe_unit) *
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le32_to_cpu(l->fl_stripe_count);
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}
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/* "period" == bytes before i start on a new set of objects */
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static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
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{
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return le32_to_cpu(l->fl_object_size) *
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le32_to_cpu(l->fl_stripe_count);
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}
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static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
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{
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return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
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}
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static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
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{
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return map && (map->flags & flag);
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}
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extern char *ceph_osdmap_state_str(char *str, int len, int state);
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static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
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int osd)
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{
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if (osd >= map->max_osd)
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return NULL;
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return &map->osd_addr[osd];
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}
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extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
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extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
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struct ceph_osdmap *map,
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struct ceph_messenger *msgr);
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extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
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/* calculate mapping of a file extent to an object */
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extern void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
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u64 off, u64 *plen,
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u64 *bno, u64 *oxoff, u64 *oxlen);
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/* calculate mapping of object to a placement group */
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extern int ceph_calc_object_layout(struct ceph_object_layout *ol,
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const char *oid,
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struct ceph_file_layout *fl,
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struct ceph_osdmap *osdmap);
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extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, union ceph_pg pgid);
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#endif
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