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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/zil.h
+19 -6
View File
@@ -166,7 +166,8 @@ typedef enum zil_create {
#define TX_SETSAXATTR 21 /* Set sa xattrs on file */
#define TX_RENAME_EXCHANGE 22 /* Atomic swap via renameat2 */
#define TX_RENAME_WHITEOUT 23 /* Atomic whiteout via renameat2 */
#define TX_MAX_TYPE 24 /* Max transaction type */
#define TX_CLONE_RANGE 24 /* Clone a file range */
#define TX_MAX_TYPE 25 /* Max transaction type */
/*
* The transactions for mkdir, symlink, remove, rmdir, link, and rename
@@ -176,9 +177,9 @@ typedef enum zil_create {
#define TX_CI ((uint64_t)0x1 << 63) /* case-insensitive behavior requested */
/*
* Transactions for write, truncate, setattr, acl_v0, and acl can be logged
* out of order. For convenience in the code, all such records must have
* lr_foid at the same offset.
* Transactions for operations below can be logged out of order.
* For convenience in the code, all such records must have lr_foid
* at the same offset.
*/
#define TX_OOO(txtype) \
((txtype) == TX_WRITE || \
@@ -187,7 +188,8 @@ typedef enum zil_create {
(txtype) == TX_ACL_V0 || \
(txtype) == TX_ACL || \
(txtype) == TX_WRITE2 || \
(txtype) == TX_SETSAXATTR)
(txtype) == TX_SETSAXATTR || \
(txtype) == TX_CLONE_RANGE)
/*
* The number of dnode slots consumed by the object is stored in the 8
@@ -387,6 +389,17 @@ typedef struct {
/* lr_acl_bytes number of variable sized ace's follows */
} lr_acl_t;
typedef struct {
lr_t lr_common; /* common portion of log record */
uint64_t lr_foid; /* file object to clone into */
uint64_t lr_offset; /* offset to clone to */
uint64_t lr_length; /* length of the blocks to clone */
uint64_t lr_blksz; /* file's block size */
uint64_t lr_nbps; /* number of block pointers */
blkptr_t lr_bps[];
/* block pointers of the blocks to clone follows */
} lr_clone_range_t;
/*
* ZIL structure definitions, interface function prototype and globals.
*/
@@ -574,7 +587,7 @@ extern void zil_set_sync(zilog_t *zilog, uint64_t syncval);
extern void zil_set_logbias(zilog_t *zilog, uint64_t slogval);
extern uint64_t zil_max_copied_data(zilog_t *zilog);
extern uint64_t zil_max_log_data(zilog_t *zilog);
extern uint64_t zil_max_log_data(zilog_t *zilog, size_t hdrsize);
extern void zil_sums_init(zil_sums_t *zs);
extern void zil_sums_fini(zil_sums_t *zs);