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FreeBSD: zfs_putpages: don't undirty pages until after write completes

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zfs_putpages() would put the entire range of pages onto the ZIL, then
return VM_PAGER_OK for each page to the kernel. However, an associated
zil_commit() or txg sync had not happened at this point, so the write
may not actually be on disk.

So, we rework it to use a ZIL commit callback, and do the post-write
work of undirtying the page and signaling completion there. We return
VM_PAGER_PEND to the kernel instead so it knows that we will take care
of it.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Mark Johnston <markj@FreeBSD.org>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17445
This commit is contained in:
Rob Norris
2025-06-05 10:15:26 +10:00
committed by Brian Behlendorf
parent aa964ce61b
commit 238eab7dc1
3 changed files with 47 additions and 15 deletions
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include/os/freebsd/spl/sys/vm.h
+1
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@@ -35,6 +35,7 @@
extern const int zfs_vm_pagerret_bad;
extern const int zfs_vm_pagerret_error;
extern const int zfs_vm_pagerret_ok;
extern const int zfs_vm_pagerret_pend;
extern const int zfs_vm_pagerput_sync;
extern const int zfs_vm_pagerput_inval;