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linux/super: add tunable to request immediate reclaim of unused dentries

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Traditionally, unused dentries would be cached in the dentry cache until
the associated entry is no longer on disk. The cached dentry continues
to hold an inode reference, causing the inode to be pinned (see previous
commit).

Here we implement the dentry op d_delete, which is roughly analogous to
the drop_inode superblock op, and add a zfs_delete_dentry tunable to
control its behaviour. By default it continues the traditional
behaviour, but when the tunable is enabled, we signal that an unused
dentry should be freed immediately, releasing its inode reference, and
so allowing that inode to be deleted if no longer in use.

Sponsored-by: Klara, Inc.
Sponsored-by: Fastmail Pty Ltd
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17746
This commit is contained in:
Rob Norris
2025-05-01 14:10:21 +10:00
committed by Brian Behlendorf
parent ab93b4b70e
commit ab8cc63c77
5 changed files with 95 additions and 0 deletions
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config/kernel-dentry-operations.m4
+25
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@@ -46,12 +46,37 @@ AC_DEFUN([ZFS_AC_KERNEL_D_SET_D_OP], [
])
])
dnl #
dnl # 6.17 API change
dnl # sb->s_d_op removed; set_default_d_op(sb, dop) added
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_SET_DEFAULT_D_OP], [
ZFS_LINUX_TEST_SRC([set_default_d_op], [
#include <linux/dcache.h>
], [
set_default_d_op(NULL, NULL);
])
])
AC_DEFUN([ZFS_AC_KERNEL_SET_DEFAULT_D_OP], [
AC_MSG_CHECKING([whether set_default_d_op() is available])
ZFS_LINUX_TEST_RESULT([set_default_d_op], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SET_DEFAULT_D_OP, 1,
[Define if set_default_d_op() is available])
], [
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_DENTRY], [
ZFS_AC_KERNEL_SRC_D_OBTAIN_ALIAS
ZFS_AC_KERNEL_SRC_D_SET_D_OP
ZFS_AC_KERNEL_SRC_SET_DEFAULT_D_OP
])
AC_DEFUN([ZFS_AC_KERNEL_DENTRY], [
ZFS_AC_KERNEL_D_OBTAIN_ALIAS
ZFS_AC_KERNEL_D_SET_D_OP
ZFS_AC_KERNEL_SET_DEFAULT_D_OP
])