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Avoid BUG in migrate_folio_extra

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Linux page migration code won't wait for writeback to complete unless
it needs to call release_folio.  Call SetPagePrivate wherever
PageUptodate is set and define .release_folio, to cause
fallback_migrate_folio to wait for us.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: tstabrawa <59430211+tstabrawa@users.noreply.github.com>
Closes #15140
Closes #16568
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tstabrawa 2024-09-26 10:57:09 -05:00 committed by GitHub
parent b2ca5105b7
commit b052035990
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6 changed files with 140 additions and 0 deletions
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33
config/kernel-vfs-invalidate_folio.m4 Normal file
View File

@ -0,0 +1,33 @@
dnl #
dnl # Linux 5.18 uses invalidate_folio in lieu of invalidate_page
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_INVALIDATE_FOLIO], [
ZFS_LINUX_TEST_SRC([vfs_has_invalidate_folio], [
#include <linux/fs.h>
static void
test_invalidate_folio(struct folio *folio, size_t offset,
size_t len) {
(void) folio; (void) offset; (void) len;
return;
}
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.invalidate_folio = test_invalidate_folio,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_INVALIDATE_FOLIO], [
dnl #
dnl # Linux 5.18 uses invalidate_folio in lieu of invalidate_page
dnl #
AC_MSG_CHECKING([whether invalidate_folio exists])
ZFS_LINUX_TEST_RESULT([vfs_has_invalidate_folio], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_INVALIDATE_FOLIO, 1, [invalidate_folio exists])
],[
AC_MSG_RESULT([no])
])
])

32
config/kernel-vfs-release_folio.m4 Normal file
View File

@ -0,0 +1,32 @@
dnl #
dnl # Linux 5.19 uses release_folio in lieu of releasepage
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_RELEASE_FOLIO], [
ZFS_LINUX_TEST_SRC([vfs_has_release_folio], [
#include <linux/fs.h>
static bool
test_release_folio(struct folio *folio, gfp_t gfp) {
(void) folio; (void) gfp;
return (0);
}
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.release_folio = test_release_folio,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_RELEASE_FOLIO], [
dnl #
dnl # Linux 5.19 uses release_folio in lieu of releasepage
dnl #
AC_MSG_CHECKING([whether release_folio exists])
ZFS_LINUX_TEST_RESULT([vfs_has_release_folio], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_RELEASE_FOLIO, 1, [release_folio exists])
],[
AC_MSG_RESULT([no])
])
])

4
config/kernel.m4
View File

@ -77,6 +77,8 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_SGET
ZFS_AC_KERNEL_SRC_VFS_FILEMAP_DIRTY_FOLIO
ZFS_AC_KERNEL_SRC_VFS_READ_FOLIO
ZFS_AC_KERNEL_SRC_VFS_RELEASE_FOLIO
ZFS_AC_KERNEL_SRC_VFS_INVALIDATE_FOLIO
ZFS_AC_KERNEL_SRC_VFS_FSYNC_2ARGS
ZFS_AC_KERNEL_SRC_VFS_DIRECT_IO
ZFS_AC_KERNEL_SRC_VFS_READPAGES
@ -185,6 +187,8 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_SGET
ZFS_AC_KERNEL_VFS_FILEMAP_DIRTY_FOLIO
ZFS_AC_KERNEL_VFS_READ_FOLIO
ZFS_AC_KERNEL_VFS_RELEASE_FOLIO
ZFS_AC_KERNEL_VFS_INVALIDATE_FOLIO
ZFS_AC_KERNEL_VFS_FSYNC_2ARGS
ZFS_AC_KERNEL_VFS_DIRECT_IO
ZFS_AC_KERNEL_VFS_READPAGES

17
module/os/linux/zfs/zfs_vnops_os.c
View File

@ -260,6 +260,15 @@ update_pages(znode_t *zp, int64_t start, int len, objset_t *os)
} else {
ClearPageError(pp);
SetPageUptodate(pp);
if (!PagePrivate(pp)) {
/*
* Set private bit so page migration
* will wait for us to finish writeback
* before calling migrate_folio().
*/
SetPagePrivate(pp);
get_page(pp);
}
if (mapping_writably_mapped(mp))
flush_dcache_page(pp);
@ -4037,6 +4046,14 @@ zfs_fillpage(struct inode *ip, struct page *pp)
} else {
ClearPageError(pp);
SetPageUptodate(pp);
if (!PagePrivate(pp)) {
/*
* Set private bit so page migration will wait for us to
* finish writeback before calling migrate_folio().
*/
SetPagePrivate(pp);
get_page(pp);
}
}
return (error);

8
module/os/linux/zfs/zfs_znode_os.c
View File

@ -1576,6 +1576,14 @@ zfs_zero_partial_page(znode_t *zp, uint64_t start, uint64_t len)
mark_page_accessed(pp);
SetPageUptodate(pp);
ClearPageError(pp);
if (!PagePrivate(pp)) {
/*
* Set private bit so page migration will wait for us to
* finish writeback before calling migrate_folio().
*/
SetPagePrivate(pp);
get_page(pp);
}
unlock_page(pp);
put_page(pp);
}

46
module/os/linux/zfs/zpl_file.c
View File

@ -607,6 +607,42 @@ zpl_writepage(struct page *pp, struct writeback_control *wbc)
return (zpl_putpage(pp, wbc, &for_sync));
}
static int
zpl_releasepage(struct page *pp, gfp_t gfp)
{
if (PagePrivate(pp)) {
ClearPagePrivate(pp);
put_page(pp);
}
return (1);
}
#ifdef HAVE_VFS_RELEASE_FOLIO
static bool
zpl_release_folio(struct folio *folio, gfp_t gfp)
{
return (zpl_releasepage(&folio->page, gfp));
}
#endif
#ifdef HAVE_VFS_INVALIDATE_FOLIO
static void
zpl_invalidate_folio(struct folio *folio, size_t offset, size_t len)
{
if ((offset == 0) && (len == PAGE_SIZE)) {
zpl_releasepage(&folio->page, 0);
}
}
#else
static void
zpl_invalidatepage(struct page *pp, unsigned int offset, unsigned int len)
{
if ((offset == 0) && (len == PAGE_SIZE)) {
zpl_releasepage(pp, 0);
}
}
#endif
/*
* The flag combination which matches the behavior of zfs_space() is
* FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE. The FALLOC_FL_PUNCH_HOLE
@ -1090,6 +1126,16 @@ const struct address_space_operations zpl_address_space_operations = {
#ifdef HAVE_VFS_FILEMAP_DIRTY_FOLIO
.dirty_folio = filemap_dirty_folio,
#endif
#ifdef HAVE_VFS_RELEASE_FOLIO
.release_folio = zpl_release_folio,
#else
.releasepage = zpl_releasepage,
#endif
#ifdef HAVE_VFS_INVALIDATE_FOLIO
.invalidate_folio = zpl_invalidate_folio,
#else
.invalidatepage = zpl_invalidatepage,
#endif
};
const struct file_operations zpl_file_operations = {