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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
31 lines
762 B
Plaintext
31 lines
762 B
Plaintext
dnl #
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dnl # 3.18 API change
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dnl # Dentry aliases are in d_u struct dentry member
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U], [
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ZFS_LINUX_TEST_SRC([dentry_alias_d_u], [
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#include <linux/fs.h>
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#include <linux/dcache.h>
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#include <linux/list.h>
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], [
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struct inode *inode __attribute__ ((unused)) = NULL;
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struct dentry *dentry __attribute__ ((unused)) = NULL;
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hlist_for_each_entry(dentry, &inode->i_dentry,
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d_u.d_alias) {
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d_drop(dentry);
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}
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_DENTRY_ALIAS_D_U], [
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AC_MSG_CHECKING([whether dentry aliases are in d_u member])
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ZFS_LINUX_TEST_RESULT([dentry_alias_d_u], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_DENTRY_D_U_ALIASES, 1,
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[dentry aliases are in d_u member])
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],[
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AC_MSG_RESULT(no)
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])
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])
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