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Linux 5.18 compat: use address_space_operations->readahead

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->readpages was removed and replaced by ->readahead. Define
zpl_readahead for kernels that don't have ->readpages.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Riccardo Schirone <rschirone91@gmail.com>
Closes #13278
This commit is contained in:
Riccardo Schirone 2022-04-02 01:15:25 +02:00 committed by Brian Behlendorf
parent 036e846abc
commit 7d524c068d
3 changed files with 48 additions and 0 deletions
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25
config/kernel-readpages.m4 Normal file
View File

@ -0,0 +1,25 @@
dnl #
dnl # Linux 5.18 removes address_space_operations ->readpages in favour of
dnl # ->readahead
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_READPAGES], [
ZFS_LINUX_TEST_SRC([vfs_has_readpages], [
#include <linux/fs.h>
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.readpages = NULL,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_READPAGES], [
AC_MSG_CHECKING([address_space_operations->readpages exists])
ZFS_LINUX_TEST_RESULT([vfs_has_readpages], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_READPAGES, 1,
[address_space_operations->readpages exists])
],[
AC_MSG_RESULT([no])
])
])

2
config/kernel.m4
View File

@ -133,6 +133,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_SIGNAL_STOP
ZFS_AC_KERNEL_SRC_SIGINFO
ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE
ZFS_AC_KERNEL_SRC_VFS_READPAGES
ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS
ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG
ZFS_AC_KERNEL_SRC_PAGEMAP_FOLIO_WAIT_BIT
@ -245,6 +246,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_SIGNAL_STOP
ZFS_AC_KERNEL_SIGINFO
ZFS_AC_KERNEL_SET_SPECIAL_STATE
ZFS_AC_KERNEL_VFS_READPAGES
ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT

21
module/os/linux/zfs/zpl_file.c
View File

@ -647,12 +647,29 @@ zpl_readpage_filler(void *data, struct page *pp)
* paging. For simplicity, the code relies on read_cache_pages() to
* correctly lock each page for IO and call zpl_readpage().
*/
#ifdef HAVE_VFS_READPAGES
static int
zpl_readpages(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages)
{
return (read_cache_pages(mapping, pages, zpl_readpage_filler, NULL));
}
#else
static void
zpl_readahead(struct readahead_control *ractl)
{
struct page *page;
while ((page = readahead_page(ractl)) != NULL) {
int ret;
ret = zpl_readpage_filler(NULL, page);
put_page(page);
if (ret)
break;
}
}
#endif
static int
zpl_putpage(struct page *pp, struct writeback_control *wbc, void *data)
@ -1135,7 +1152,11 @@ zpl_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
const struct address_space_operations zpl_address_space_operations = {
#ifdef HAVE_VFS_READPAGES
.readpages = zpl_readpages,
#else
.readahead = zpl_readahead,
#endif
.readpage = zpl_readpage,
.writepage = zpl_writepage,
.writepages = zpl_writepages,