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Default to zfs_bclone_wait_dirty=1

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Update the default FICLONE and FICLONERANGE ioctl behavior to wait
on dirty blocks.  While this does remove some control from the
application, in practice ZFS is better positioned to the optimial
thing and immediately force a TXG sync.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17455
This commit is contained in:
Brian Behlendorf
2025-07-25 07:42:23 -07:00
committed by GitHub
parent 4bd7a2eaa5
commit cf146460c1
4 changed files with 39 additions and 14 deletions
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man/man4/zfs.4
+8 -7
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@@ -1399,14 +1399,15 @@ If this setting is 0, then even if feature@block_cloning is enabled,
using functions and system calls that attempt to clone blocks will act as
though the feature is disabled.
.
.It Sy zfs_bclone_wait_dirty Ns = Ns Sy 0 Ns | Ns 1 Pq int
When set to 1 the FICLONE and FICLONERANGE ioctls wait for dirty data to be
written to disk.
This allows the clone operation to reliably succeed when a file is
.It Sy zfs_bclone_wait_dirty Ns = Ns Sy 1 Ns | Ns 0 Pq int
When set to 1 the FICLONE and FICLONERANGE ioctls will wait for any dirty
data to be written to disk before proceeding.
This ensures that the clone operation reliably succeeds, even if a file is
modified and then immediately cloned.
For small files this may be slower than making a copy of the file.
Therefore, this setting defaults to 0 which causes a clone operation to
immediately fail when encountering a dirty block.
Note that for small files this may be slower than simply copying the file.
When set to 0 the clone operation will immediately fail if it encounters
any dirty blocks.
By default waiting is enabled.
.
.It Sy zfs_blake3_impl Ns = Ns Sy fastest Pq string
Select a BLAKE3 implementation.