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31 * Define ost_id associated functions
34 #ifndef _UAPI_LUSTRE_OSTID_H_
35 #define _UAPI_LUSTRE_OSTID_H_
38 * This is due to us being out of kernel and the way the OpenSFS branch
39 * handles CFLAGS. Upstream will just have linux/lustre_fid.h
42 #include <uapi/linux/lustre_fid.h>
44 #include <linux/lustre_fid.h>
47 static inline __u64 lmm_oi_id(const struct ost_id *oi)
52 static inline __u64 lmm_oi_seq(const struct ost_id *oi)
57 static inline void lmm_oi_set_seq(struct ost_id *oi, __u64 seq)
62 static inline void lmm_oi_set_id(struct ost_id *oi, __u64 oid)
67 static inline void lmm_oi_le_to_cpu(struct ost_id *dst_oi,
68 const struct ost_id *src_oi)
70 dst_oi->oi.oi_id = __le64_to_cpu(src_oi->oi.oi_id);
71 dst_oi->oi.oi_seq = __le64_to_cpu(src_oi->oi.oi_seq);
74 static inline void lmm_oi_cpu_to_le(struct ost_id *dst_oi,
75 const struct ost_id *src_oi)
77 dst_oi->oi.oi_id = __cpu_to_le64(src_oi->oi.oi_id);
78 dst_oi->oi.oi_seq = __cpu_to_le64(src_oi->oi.oi_seq);
81 /* extract OST sequence (group) from a wire ost_id (id/seq) pair */
82 static inline __u64 ostid_seq(const struct ost_id *ostid)
84 if (fid_seq_is_mdt0(ostid->oi.oi_seq))
85 return FID_SEQ_OST_MDT0;
87 if (fid_seq_is_default(ostid->oi.oi_seq))
88 return FID_SEQ_LOV_DEFAULT;
90 if (fid_is_idif(&ostid->oi_fid))
91 return FID_SEQ_OST_MDT0;
93 return fid_seq(&ostid->oi_fid);
96 /* extract OST objid from a wire ost_id (id/seq) pair */
97 static inline __u64 ostid_id(const struct ost_id *ostid)
99 if (fid_seq_is_mdt0(ostid->oi.oi_seq))
100 return ostid->oi.oi_id & IDIF_OID_MASK;
102 if (fid_seq_is_default(ostid->oi.oi_seq))
103 return ostid->oi.oi_id;
105 if (fid_is_idif(&ostid->oi_fid))
106 return fid_idif_id(fid_seq(&ostid->oi_fid),
107 fid_oid(&ostid->oi_fid), 0);
109 return fid_oid(&ostid->oi_fid);
112 static inline void ostid_set_seq(struct ost_id *oi, __u64 seq)
114 if (fid_seq_is_mdt0(seq) || fid_seq_is_default(seq)) {
117 oi->oi_fid.f_seq = seq;
119 * Note: if f_oid + f_ver is zero, we need init it
120 * to be 1, otherwise, ostid_seq will treat this
121 * as old ostid (oi_seq == 0)
123 if (!oi->oi_fid.f_oid && !oi->oi_fid.f_ver)
124 oi->oi_fid.f_oid = LUSTRE_FID_INIT_OID;
128 static inline void ostid_set_seq_mdt0(struct ost_id *oi)
130 ostid_set_seq(oi, FID_SEQ_OST_MDT0);
133 static inline void ostid_set_seq_echo(struct ost_id *oi)
135 ostid_set_seq(oi, FID_SEQ_ECHO);
138 static inline void ostid_set_seq_llog(struct ost_id *oi)
140 ostid_set_seq(oi, FID_SEQ_LLOG);
143 static inline void ostid_cpu_to_le(const struct ost_id *src_oi,
144 struct ost_id *dst_oi)
146 if (fid_seq_is_mdt0(src_oi->oi.oi_seq)) {
147 dst_oi->oi.oi_id = __cpu_to_le64(src_oi->oi.oi_id);
148 dst_oi->oi.oi_seq = __cpu_to_le64(src_oi->oi.oi_seq);
150 fid_cpu_to_le(&dst_oi->oi_fid, &src_oi->oi_fid);
154 static inline void ostid_le_to_cpu(const struct ost_id *src_oi,
155 struct ost_id *dst_oi)
157 if (fid_seq_is_mdt0(src_oi->oi.oi_seq)) {
158 dst_oi->oi.oi_id = __le64_to_cpu(src_oi->oi.oi_id);
159 dst_oi->oi.oi_seq = __le64_to_cpu(src_oi->oi.oi_seq);
161 fid_le_to_cpu(&dst_oi->oi_fid, &src_oi->oi_fid);
166 * Sigh, because pre-2.4 uses
167 * struct lov_mds_md_v1 {
169 * __u64 lmm_object_id;
170 * __u64 lmm_object_seq;
173 * to identify the LOV(MDT) object, and lmm_object_seq will
174 * be normal_fid, which make it hard to combine these conversion
175 * to ostid_to FID. so we will do lmm_oi/fid conversion separately
177 * We can tell the lmm_oi by this way,
178 * 1.8: lmm_object_id = {inode}, lmm_object_gr = 0
179 * 2.1: lmm_object_id = {oid < 128k}, lmm_object_seq = FID_SEQ_NORMAL
180 * 2.4: lmm_oi.f_seq = FID_SEQ_NORMAL, lmm_oi.f_oid = {oid < 128k},
183 * But currently lmm_oi/lsm_oi does not have any "real" usages,
184 * except for printing some information, and the user can always
185 * get the real FID from LMA, besides this multiple case check might
186 * make swab more complicate. So we will keep using id/seq for lmm_oi.
189 static inline void fid_to_lmm_oi(const struct lu_fid *fid,
192 oi->oi.oi_id = fid_oid(fid);
193 oi->oi.oi_seq = fid_seq(fid);
197 * Unpack an OST object id/seq (group) into a FID. This is needed for
198 * converting all obdo, lmm, lsm, etc. 64-bit id/seq pairs into proper
199 * FIDs. Note that if an id/seq is already in FID/IDIF format it will
200 * be passed through unchanged. Only legacy OST objects in "group 0"
201 * will be mapped into the IDIF namespace so that they can fit into the
202 * struct lu_fid fields without loss.
204 static inline int ostid_to_fid(struct lu_fid *fid, const struct ost_id *ostid,
207 __u64 seq = ostid_seq(ostid);
209 if (ost_idx > 0xffff)
212 if (fid_seq_is_mdt0(seq)) {
213 __u64 oid = ostid_id(ostid);
215 /* This is a "legacy" (old 1.x/2.early) OST object in "group 0"
216 * that we map into the IDIF namespace. It allows up to 2^48
217 * objects per OST, as this is the object namespace that has
218 * been in production for years. This can handle create rates
219 * of 1M objects/s/OST for 9 years, or combinations thereof.
221 if (oid >= IDIF_MAX_OID)
224 fid->f_seq = fid_idif_seq(oid, ost_idx);
225 /* truncate to 32 bits by assignment */
227 /* in theory, not currently used */
228 fid->f_ver = oid >> 48;
229 } else if (!fid_seq_is_default(seq)) {
230 /* This is either an IDIF object, which identifies objects
231 * across all OSTs, or a regular FID. The IDIF namespace
232 * maps legacy OST objects into the FID namespace. In both
233 * cases, we just pass the FID through, no conversion needed.
235 if (ostid->oi_fid.f_ver)
238 *fid = ostid->oi_fid;
243 #endif /* _UAPI_LUSTRE_OSTID_H_ */