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31 * Define ost_id associated functions
34 #ifndef _UAPI_LUSTRE_OSTID_H_
35 #define _UAPI_LUSTRE_OSTID_H_
37 #include <linux/errno.h>
38 #include <uapi/linux/lustre/lustre_fid.h>
40 static inline __u64 lmm_oi_id(const struct ost_id *oi)
45 static inline __u64 lmm_oi_seq(const struct ost_id *oi)
50 static inline void lmm_oi_set_seq(struct ost_id *oi, __u64 seq)
55 static inline void lmm_oi_set_id(struct ost_id *oi, __u64 oid)
60 static inline void lmm_oi_le_to_cpu(struct ost_id *dst_oi,
61 const struct ost_id *src_oi)
63 dst_oi->oi.oi_id = __le64_to_cpu(src_oi->oi.oi_id);
64 dst_oi->oi.oi_seq = __le64_to_cpu(src_oi->oi.oi_seq);
67 static inline void lmm_oi_cpu_to_le(struct ost_id *dst_oi,
68 const struct ost_id *src_oi)
70 dst_oi->oi.oi_id = __cpu_to_le64(src_oi->oi.oi_id);
71 dst_oi->oi.oi_seq = __cpu_to_le64(src_oi->oi.oi_seq);
74 /* extract OST sequence (group) from a wire ost_id (id/seq) pair */
75 static inline __u64 ostid_seq(const struct ost_id *ostid)
77 if (fid_seq_is_mdt0(ostid->oi.oi_seq))
78 return FID_SEQ_OST_MDT0;
80 if (fid_seq_is_default(ostid->oi.oi_seq))
81 return FID_SEQ_LOV_DEFAULT;
83 if (fid_is_idif(&ostid->oi_fid))
84 return FID_SEQ_OST_MDT0;
86 return fid_seq(&ostid->oi_fid);
89 /* extract OST objid from a wire ost_id (id/seq) pair */
90 static inline __u64 ostid_id(const struct ost_id *ostid)
92 if (fid_seq_is_mdt0(ostid->oi.oi_seq))
93 return ostid->oi.oi_id & IDIF_OID_MASK;
95 if (fid_seq_is_default(ostid->oi.oi_seq))
96 return ostid->oi.oi_id;
98 if (fid_is_idif(&ostid->oi_fid))
99 return fid_idif_id(fid_seq(&ostid->oi_fid),
100 fid_oid(&ostid->oi_fid), 0);
102 return fid_oid(&ostid->oi_fid);
105 static inline void ostid_set_seq(struct ost_id *oi, __u64 seq)
107 if (fid_seq_is_mdt0(seq) || fid_seq_is_default(seq)) {
110 oi->oi_fid.f_seq = seq;
112 * Note: if f_oid + f_ver is zero, we need init it
113 * to be 1, otherwise, ostid_seq will treat this
114 * as old ostid (oi_seq == 0)
116 if (!oi->oi_fid.f_oid && !oi->oi_fid.f_ver)
117 oi->oi_fid.f_oid = LUSTRE_FID_INIT_OID;
121 static inline void ostid_set_seq_mdt0(struct ost_id *oi)
123 ostid_set_seq(oi, FID_SEQ_OST_MDT0);
126 static inline void ostid_set_seq_echo(struct ost_id *oi)
128 ostid_set_seq(oi, FID_SEQ_ECHO);
131 static inline void ostid_set_seq_llog(struct ost_id *oi)
133 ostid_set_seq(oi, FID_SEQ_LLOG);
136 static inline void ostid_cpu_to_le(const struct ost_id *src_oi,
137 struct ost_id *dst_oi)
139 if (fid_seq_is_mdt0(src_oi->oi.oi_seq)) {
140 dst_oi->oi.oi_id = __cpu_to_le64(src_oi->oi.oi_id);
141 dst_oi->oi.oi_seq = __cpu_to_le64(src_oi->oi.oi_seq);
143 fid_cpu_to_le(&dst_oi->oi_fid, &src_oi->oi_fid);
147 static inline void ostid_le_to_cpu(const struct ost_id *src_oi,
148 struct ost_id *dst_oi)
150 if (fid_seq_is_mdt0(src_oi->oi.oi_seq)) {
151 dst_oi->oi.oi_id = __le64_to_cpu(src_oi->oi.oi_id);
152 dst_oi->oi.oi_seq = __le64_to_cpu(src_oi->oi.oi_seq);
154 fid_le_to_cpu(&dst_oi->oi_fid, &src_oi->oi_fid);
159 * Sigh, because pre-2.4 uses
160 * struct lov_mds_md_v1 {
162 * __u64 lmm_object_id;
163 * __u64 lmm_object_seq;
166 * to identify the LOV(MDT) object, and lmm_object_seq will
167 * be normal_fid, which make it hard to combine these conversion
168 * to ostid_to FID. so we will do lmm_oi/fid conversion separately
170 * We can tell the lmm_oi by this way,
171 * 1.8: lmm_object_id = {inode}, lmm_object_gr = 0
172 * 2.1: lmm_object_id = {oid < 128k}, lmm_object_seq = FID_SEQ_NORMAL
173 * 2.4: lmm_oi.f_seq = FID_SEQ_NORMAL, lmm_oi.f_oid = {oid < 128k},
176 * But currently lmm_oi/lsm_oi does not have any "real" usages,
177 * except for printing some information, and the user can always
178 * get the real FID from LMA, besides this multiple case check might
179 * make swab more complicate. So we will keep using id/seq for lmm_oi.
182 static inline void fid_to_lmm_oi(const struct lu_fid *fid,
185 oi->oi.oi_id = fid_oid(fid);
186 oi->oi.oi_seq = fid_seq(fid);
190 * Unpack an OST object id/seq (group) into a FID. This is needed for
191 * converting all obdo, lmm, lsm, etc. 64-bit id/seq pairs into proper
192 * FIDs. Note that if an id/seq is already in FID/IDIF format it will
193 * be passed through unchanged. Only legacy OST objects in "group 0"
194 * will be mapped into the IDIF namespace so that they can fit into the
195 * struct lu_fid fields without loss.
197 static inline int ostid_to_fid(struct lu_fid *fid, const struct ost_id *ostid,
200 __u64 seq = ostid_seq(ostid);
202 if (ost_idx > 0xffff)
205 if (fid_seq_is_mdt0(seq)) {
206 __u64 oid = ostid_id(ostid);
208 /* This is a "legacy" (old 1.x/2.early) OST object in "group 0"
209 * that we map into the IDIF namespace. It allows up to 2^48
210 * objects per OST, as this is the object namespace that has
211 * been in production for years. This can handle create rates
212 * of 1M objects/s/OST for 9 years, or combinations thereof.
214 if (oid >= IDIF_MAX_OID)
217 fid->f_seq = fid_idif_seq(oid, ost_idx);
218 /* truncate to 32 bits by assignment */
220 /* in theory, not currently used */
221 fid->f_ver = oid >> 48;
222 } else if (!fid_seq_is_default(seq)) {
223 /* This is either an IDIF object, which identifies objects
224 * across all OSTs, or a regular FID. The IDIF namespace
225 * maps legacy OST objects into the FID namespace. In both
226 * cases, we just pass the FID through, no conversion needed.
228 if (ostid->oi_fid.f_ver)
231 *fid = ostid->oi_fid;
236 #endif /* _UAPI_LUSTRE_OSTID_H_ */