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e8afad656c
ceph_calc_file_object_mapping() takes (among other things) a "file"
offset and length, and based on the layout, determines the object
number ("bno") backing the affected portion of the file's data and
the offset into that object where the desired range begins. It also
computes the size that should be used for the request--either the
amount requested or something less if that would exceed the end of
the object.
This patch changes the input length parameter in this function so it
is used only for input. That is, the argument will be passed by
value rather than by address, so the value provided won't get
updated by the function.
The value would only get updated if the length would surpass the
current object, and in that case the value it got updated to would
be exactly that returned in *oxlen.
Only one of the two callers is affected by this change. Update
ceph_calc_raw_layout() so it records any updated value.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
#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 <linux/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 rb_node node;
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int id;
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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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char *name;
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};
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struct ceph_pg_mapping {
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struct rb_node node;
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struct ceph_pg 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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struct rb_root pg_pools;
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u32 pool_max;
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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_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 int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
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u64 off, u64 len,
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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_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
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int *acting);
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extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
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struct ceph_pg pgid);
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extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
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extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
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#endif
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