* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*/
/*
LUSTRE_SEQ_SUPER_WIDTH = ((1ULL << 30ULL) * LUSTRE_SEQ_META_WIDTH)
};
-/** special fid seq: used for local object create. */
-#define FID_SEQ_LOCAL_FILE (FID_SEQ_START + 1)
-
-/** special fid seq: used for .lustre objects. */
-#define LU_DOT_LUSTRE_SEQ (FID_SEQ_START + 0x02ULL)
-
-/* Note that reserved SEQ numbers below 12 will conflict with ldiskfs
- * inodes in the IGIF namespace, so these reserved SEQ numbers must be
- * used sparingly until ldiskfs-based MDT backends and/or IGIF FIDs
- * have been completely removed. */
-
-/** fid sequence for distributed fs objects */
-#define FID_SEQ_DISTRIBUTED_START (FID_SEQ_START + 0x400ULL)
-
/** special OID for local objects */
-enum {
+enum local_oid {
/** \see osd_oi_index_create */
OSD_OI_FID_16_OID = 2UL,
/** \see fld_mod_init */
/**
- * Flatten 128-bit FID values into a 64-bit value for
- * use as an inode number. For non-IGIF FIDs this
- * starts just over 2^32, and continues without conflict
- * until 2^64, at which point we wrap the high 32 bits
- * of the SEQ into the range where there may not be many
- * OID values in use, to minimize the risk of conflict.
+ * Flatten 128-bit FID values into a 64-bit value for use as an inode number.
+ * For non-IGIF FIDs this starts just over 2^32, and continues without
+ * conflict until 2^64, at which point we wrap the high 24 bits of the SEQ
+ * into the range where there may not be many OID values in use, to minimize
+ * the risk of conflict.
*
- * The time between re-used inode numbers is very long -
- * 2^32 SEQ numbers, or about 2^32 client mounts. */
+ * Suppose LUSTRE_SEQ_MAX_WIDTH less than (1 << 24) which is currently true,
+ * the time between re-used inode numbers is very long - 2^40 SEQ numbers,
+ * or about 2^40 client mounts, if clients create less than 2^24 files/mount.
+ */
static inline __u64 fid_flatten(const struct lu_fid *fid)
{
__u64 ino;
seq = fid_seq(fid);
- ino = (seq << 24) + ((seq >> (64-8)) & 0xffffff0000ULL) + fid_oid(fid);
+ ino = (seq << 24) + ((seq >> 24) & 0xffffff0000ULL) + fid_oid(fid);
RETURN(ino ? ino : fid_oid(fid));
}
+static inline __u32 fid_hash(const struct lu_fid *f, int bits)
+{
+ /* all objects with same id and different versions will belong to same
+ * collisions list. */
+ return cfs_hash_long(fid_flatten(f), bits);
+}
+
/**
* map fid to 32 bit value for ino on 32bit systems. */
static inline __u32 fid_flatten32(const struct lu_fid *fid)
seq = fid_seq(fid) - FID_SEQ_START;
- ino = ((seq & 0xfffffULL) << 12) + ((seq >> 8) & 0xfffff000) +
- (seq >> (64 - (40-8)) & 0xffffff00) + fid_oid(fid);
+ /* Map the high bits of the OID into higher bits of the inode number so
+ * that inodes generated at about the same time have a reduced chance
+ * of collisions. This will give a period of 2^12 = 1024 unique clients
+ * (from SEQ) and up to min(LUSTRE_SEQ_MAX_WIDTH, 2^20) = 128k objects
+ * (from OID), or up to 128M inodes without collisions for new files. */
+ ino = ((seq & 0x000fffffULL) << 12) + ((seq >> 8) & 0xfffff000) +
+ (seq >> (64 - (40-8)) & 0xffffff00) +
+ (fid_oid(fid) & 0xff000fff) + ((fid_oid(fid) & 0x00fff000) << 8);
+
RETURN(ino ? ino : fid_oid(fid));
}
{
dst->lsr_start = cpu_to_le64(src->lsr_start);
dst->lsr_end = cpu_to_le64(src->lsr_end);
- dst->lsr_mdt = cpu_to_le32(src->lsr_mdt);
+ dst->lsr_index = cpu_to_le32(src->lsr_index);
+ dst->lsr_flags = cpu_to_le32(src->lsr_flags);
}
static inline void range_le_to_cpu(struct lu_seq_range *dst, const struct lu_seq_range *src)
{
dst->lsr_start = le64_to_cpu(src->lsr_start);
dst->lsr_end = le64_to_cpu(src->lsr_end);
- dst->lsr_mdt = le32_to_cpu(src->lsr_mdt);
+ dst->lsr_index = le32_to_cpu(src->lsr_index);
+ dst->lsr_flags = le32_to_cpu(src->lsr_flags);
}
static inline void range_cpu_to_be(struct lu_seq_range *dst, const struct lu_seq_range *src)
{
dst->lsr_start = cpu_to_be64(src->lsr_start);
dst->lsr_end = cpu_to_be64(src->lsr_end);
- dst->lsr_mdt = cpu_to_be32(src->lsr_mdt);
+ dst->lsr_index = cpu_to_be32(src->lsr_index);
+ dst->lsr_flags = cpu_to_be32(src->lsr_flags);
}
static inline void range_be_to_cpu(struct lu_seq_range *dst, const struct lu_seq_range *src)
{
dst->lsr_start = be64_to_cpu(src->lsr_start);
dst->lsr_end = be64_to_cpu(src->lsr_end);
- dst->lsr_mdt = be32_to_cpu(src->lsr_mdt);
+ dst->lsr_index = be32_to_cpu(src->lsr_index);
+ dst->lsr_flags = be32_to_cpu(src->lsr_flags);
}
/** @} fid */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff