Rob Norris 3b64a9619f FreeBSD: zfs_putpages: don't undirty pages until after write completes ... In syncing mode, 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 that case 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. The original version of this (238eab7dc1) copied the Linux model and did the cleanup in a ZIL callback for both async and sync. This was a mistake, as FreeBSD does not have a separate "busy for writeback" flag like Linux which keeps the page usable. The full sbusy flag locks the entire page out until the itx callback fires, which for async is after txg sync, which could be literal seconds in the future. For the async case, the data is already on the DMU and the in-memory ZIL, which is sufficient for async writeback, so the old method of logging it without a callback, undirtying the page and returning is more than sufficient and reclaims that lost performance. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Mark Johnston <markj@FreeBSD.org> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #17533		2025-08-12 22:41:17 -04:00
..
avl	SPDX: license tags: CDDL-1.0	2025-04-16 09:59:44 -07:00
icp	Linux build: silence objtool warnings	2025-06-17 10:50:26 -07:00
lua	SPDX: license tags: MIT	2025-04-16 09:59:44 -07:00
nvpair	SPDX: license tags: CDDL-1.0	2025-04-16 09:59:44 -07:00
os	FreeBSD: zfs_putpages: don't undirty pages until after write completes	2025-08-12 22:41:17 -04:00
unicode	[2.3.2] uconv: add SPDX license tag	2025-04-16 09:59:45 -07:00
zcommon	GCC 15: Fix unterminated-string-initialization (#17244)	2025-04-16 09:59:45 -07:00
zfs	Allow vmem_alloc backed multilists	2025-08-12 17:24:30 -07:00
zstd	Silence zstd large allocation warning	2025-08-12 17:24:26 -07:00
.gitignore	FreeBSD: Ignore symlink to i386 includes	2022-08-02 16:34:23 -07:00
Kbuild.in	linux: Fix out-of-src builds	2025-08-12 17:22:40 -07:00
Makefile.bsd	freebsd: unbreak module/Makefile.bsd build on 15-CURRENT-arm64	2025-04-16 09:59:45 -07:00
Makefile.in	objtool wrapper: use absolute path to call the wrapper	2025-08-07 13:10:58 -04:00