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Remove zpl_revalidate: fix snapshot rollback

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Open files, which aren't present in the snapshot, which is being
roll-backed to, need to disappear from the visible VFS image of
the dataset.

Kernel provides d_drop function to drop invalid entry from
the dcache, but inode can be referenced by dentry multiple dentries.

The introduced zpl_d_drop_aliases function walks and invalidates
all aliases of an inode.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pavel Snajdr <snajpa@snajpa.net>
Closes #9600
Closes #14070
This commit is contained in:
Pavel Snajdr
2019-12-05 01:52:27 +01:00
committed by Brian Behlendorf
parent e09fdda977
commit 86db35c447
10 changed files with 59 additions and 56 deletions
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config/kernel-dentry-alias.m4
+30
View File
@@ -0,0 +1,30 @@
dnl #
dnl # 3.18 API change
dnl # Dentry aliases are in d_u struct dentry member
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U], [
ZFS_LINUX_TEST_SRC([dentry_alias_d_u], [
#include <linux/fs.h>
#include <linux/dcache.h>
#include <linux/list.h>
], [
struct inode *inode __attribute__ ((unused)) = NULL;
struct dentry *dentry __attribute__ ((unused)) = NULL;
hlist_for_each_entry(dentry, &inode->i_dentry,
d_u.d_alias) {
d_drop(dentry);
}
])
])
AC_DEFUN([ZFS_AC_KERNEL_DENTRY_ALIAS_D_U], [
AC_MSG_CHECKING([whether dentry aliases are in d_u member])
ZFS_LINUX_TEST_RESULT([dentry_alias_d_u], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_DENTRY_D_U_ALIASES, 1,
[dentry aliases are in d_u member])
],[
AC_MSG_RESULT(no)
])
])