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zvol: implement platform-independent part of block cloning

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In Linux, block devices currently lack support for `copy_file_range`
API because the kernel does not provide the necessary functionality.
However, there is an ongoing upstream effort to address this
limitation: https://patchwork.kernel.org/project/dm-devel/cover/20240520102033.9361-1-nj.shetty@samsung.com/.
We have adopted this upstream kernel patch into the TrueNAS kernel and
made some additional modifications to enable block cloning specifically
for the zvol block device. This patch implements the platform-
independent portions of these changes for inclusion in OpenZFS.
This patch does not introduce any new functionality directly into
OpenZFS. The `TX_CLONE_RANGE` replay capability is only relevant when
zvols are migrated to non-TrueNAS systems that support Clone Range
replay in the ZIL.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #16901
This commit is contained in:
Ameer Hamza
2024-12-30 00:41:30 +05:00
committed by GitHub
parent a153397f41
commit 9dd5fe1095
3 changed files with 289 additions and 2 deletions
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include/sys/zvol_impl.h
+5
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@@ -88,6 +88,11 @@ int zvol_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf,
int zvol_init_impl(void);
void zvol_fini_impl(void);
void zvol_wait_close(zvol_state_t *zv);
int zvol_clone_range(zvol_state_handle_t *, uint64_t,
zvol_state_handle_t *, uint64_t, uint64_t);
void zvol_log_clone_range(zilog_t *zilog, dmu_tx_t *tx, int txtype,
uint64_t off, uint64_t len, uint64_t blksz, const blkptr_t *bps,
size_t nbps);
/*
* platform dependent functions exported to platform independent code