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Implementation of block cloning for ZFS

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Block Cloning allows to manually clone a file (or a subset of its
blocks) into another (or the same) file by just creating additional
references to the data blocks without copying the data itself.
Those references are kept in the Block Reference Tables (BRTs).

The whole design of block cloning is documented in module/zfs/brt.c.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Christian Schwarz <christian.schwarz@nutanix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #13392
This commit is contained in:
Pawel Jakub Dawidek
2023-03-10 20:59:53 +01:00
committed by GitHub
parent da19d919a8
commit 67a1b03791
51 changed files with 3480 additions and 120 deletions
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include/sys/dmu.h
+8
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@@ -782,6 +782,8 @@ dmu_tx_t *dmu_tx_create(objset_t *os);
void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len);
void dmu_tx_hold_write_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
int len);
void dmu_tx_hold_clone_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
int len);
void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off,
uint64_t len);
void dmu_tx_hold_free_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
@@ -1059,6 +1061,12 @@ int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd);
int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole,
uint64_t *off);
int dmu_read_l0_bps(objset_t *os, uint64_t object, uint64_t offset,
uint64_t length, dmu_tx_t *tx, struct blkptr *bps, size_t *nbpsp);
void dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset,
uint64_t length, dmu_tx_t *tx, const struct blkptr *bps, size_t nbps,
boolean_t replay);
/*
* Initial setup and final teardown.
*/