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Add xattr_handler support for Android kernels 

Some ARM BSPs run the Android kernel, which has
a modified xattr_handler->get() function signature.
This adds support to compile against these kernels.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Walter Huf <hufman@gmail.com>
Closes #13824
This commit is contained in:
Walter Huf 2022-09-06 10:02:18 -07:00 committed by Tony Hutter
parent aa9e887d2a
commit 2010c183bc
2 changed files with 42 additions and 1 deletions
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29
config/kernel-xattr-handler.m4
View File

@ -100,6 +100,19 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_XATTR_HANDLER_GET], [
.get = get, .get = get,
}; };
],[]) ],[])
ZFS_LINUX_TEST_SRC([xattr_handler_get_dentry_inode_flags], [
#include <linux/xattr.h>
int get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *buffer,
size_t size, int flags) { return 0; }
static const struct xattr_handler
xops __attribute__ ((unused)) = {
.get = get,
};
],[])
]) ])
AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_GET], [ AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_GET], [
@ -142,7 +155,21 @@ AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_GET], [
AC_DEFINE(HAVE_XATTR_GET_DENTRY, 1, AC_DEFINE(HAVE_XATTR_GET_DENTRY, 1,
[xattr_handler->get() wants dentry]) [xattr_handler->get() wants dentry])
],[ ],[
ZFS_LINUX_TEST_ERROR([xattr get()]) dnl #
dnl # Android API change,
dnl # The xattr_handler->get() callback was
dnl # changed to take dentry, inode and flags.
dnl #
AC_MSG_RESULT(no)
AC_MSG_CHECKING(
[whether xattr_handler->get() wants dentry and inode and flags])
ZFS_LINUX_TEST_RESULT([xattr_handler_get_dentry_inode_flags], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_XATTR_GET_DENTRY_INODE_FLAGS, 1,
[xattr_handler->get() wants dentry and inode and flags])
],[
ZFS_LINUX_TEST_ERROR([xattr get()])
])
]) ])
]) ])
]) ])

14
include/os/linux/kernel/linux/xattr_compat.h
View File

@ -115,6 +115,20 @@ fn(struct dentry *dentry, const char *name, void *buffer, size_t size, \
{ \ { \
return (__ ## fn(dentry->d_inode, name, buffer, size)); \ return (__ ## fn(dentry->d_inode, name, buffer, size)); \
} }
/*
* Android API change,
* The xattr_handler->get() callback was changed to take a dentry and inode
* and flags, because the dentry might not be attached to an inode yet.
*/
#elif defined(HAVE_XATTR_GET_DENTRY_INODE_FLAGS)
#define ZPL_XATTR_GET_WRAPPER(fn) \
static int \
fn(const struct xattr_handler *handler, struct dentry *dentry, \
struct inode *inode, const char *name, void *buffer, \
size_t size, int flags) \
{ \
return (__ ## fn(inode, name, buffer, size)); \
}
#else #else
#error "Unsupported kernel" #error "Unsupported kernel"
#endif #endif