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zpl_sync_fs: work around kernels that ignore sync_fs errors

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If the kernel will honour our error returns, use them. If not, fool it
by setting a writeback error on the superblock, if available.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17420
This commit is contained in:
Rob Norris
2025-06-04 13:26:58 +10:00
committed by Brian Behlendorf
parent e3f5e317e0
commit d1c88cbd4c
3 changed files with 85 additions and 1 deletions
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config/kernel.m4
+2
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@@ -131,6 +131,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_FILE
ZFS_AC_KERNEL_SRC_PIN_USER_PAGES
ZFS_AC_KERNEL_SRC_TIMER
ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_WB_ERR
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
@@ -246,6 +247,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_FILE
ZFS_AC_KERNEL_PIN_USER_PAGES
ZFS_AC_KERNEL_TIMER
ZFS_AC_KERNEL_SUPER_BLOCK_S_WB_ERR
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_CPU_HAS_FEATURE