mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-25 02:49:32 +03:00
7a789346af
Commit 933ec99 removes read and write from f_op because the vfs layer will
select iter_write or aio_write automatically. However, for Linux <= 4.0,
loop_set_fd will actually check f_op->write and set read-only if not exists.
This patch add them back and use the generic do_sync_{read,write} for
aio_{read,write} and new_sync_{read,write} for {read,write}_iter.
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Closes #5776
Closes #5855
69 lines
1.4 KiB
Plaintext
69 lines
1.4 KiB
Plaintext
dnl #
|
|
dnl # Linux 3.16 API
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_VFS_RW_ITERATE],
|
|
[AC_MSG_CHECKING([whether fops->read/write_iter() are available])
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/fs.h>
|
|
|
|
ssize_t test_read(struct kiocb *kiocb, struct iov_iter *to)
|
|
{ return 0; }
|
|
ssize_t test_write(struct kiocb *kiocb, struct iov_iter *from)
|
|
{ return 0; }
|
|
|
|
static const struct file_operations
|
|
fops __attribute__ ((unused)) = {
|
|
.read_iter = test_read,
|
|
.write_iter = test_write,
|
|
};
|
|
],[
|
|
],[
|
|
AC_MSG_RESULT(yes)
|
|
AC_DEFINE(HAVE_VFS_RW_ITERATE, 1,
|
|
[fops->read/write_iter() are available])
|
|
|
|
ZFS_AC_KERNEL_NEW_SYNC_READ
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
])
|
|
])
|
|
|
|
dnl #
|
|
dnl # Linux 4.1 API
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_NEW_SYNC_READ],
|
|
[AC_MSG_CHECKING([whether new_sync_read() is available])
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/fs.h>
|
|
],[
|
|
new_sync_read(NULL, NULL, 0, NULL);
|
|
],[
|
|
AC_MSG_RESULT(yes)
|
|
AC_DEFINE(HAVE_NEW_SYNC_READ, 1,
|
|
[new_sync_read() is available])
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
])
|
|
])
|
|
|
|
dnl #
|
|
dnl # Linux 4.1.x API
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_GENERIC_WRITE_CHECKS],
|
|
[AC_MSG_CHECKING([whether generic_write_checks() takes kiocb])
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/fs.h>
|
|
|
|
],[
|
|
struct kiocb *iocb = NULL;
|
|
struct iov_iter *iov = NULL;
|
|
generic_write_checks(iocb, iov);
|
|
],[
|
|
AC_MSG_RESULT(yes)
|
|
AC_DEFINE(HAVE_GENERIC_WRITE_CHECKS_KIOCB, 1,
|
|
[generic_write_checks() takes kiocb])
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
])
|
|
])
|