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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 #
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dnl # Linux 3.16 API
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_VFS_RW_ITERATE],
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[AC_MSG_CHECKING([whether fops->read/write_iter() are available])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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ssize_t test_read(struct kiocb *kiocb, struct iov_iter *to)
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{ return 0; }
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ssize_t test_write(struct kiocb *kiocb, struct iov_iter *from)
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{ return 0; }
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static const struct file_operations
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fops __attribute__ ((unused)) = {
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.read_iter = test_read,
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.write_iter = test_write,
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};
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],[
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_VFS_RW_ITERATE, 1,
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[fops->read/write_iter() are available])
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ZFS_AC_KERNEL_NEW_SYNC_READ
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],[
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AC_MSG_RESULT(no)
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])
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])
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dnl #
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dnl # Linux 4.1 API
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_NEW_SYNC_READ],
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[AC_MSG_CHECKING([whether new_sync_read() is available])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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],[
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new_sync_read(NULL, NULL, 0, NULL);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_NEW_SYNC_READ, 1,
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[new_sync_read() is available])
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],[
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AC_MSG_RESULT(no)
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])
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])
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dnl #
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dnl # Linux 4.1.x API
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_GENERIC_WRITE_CHECKS],
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[AC_MSG_CHECKING([whether generic_write_checks() takes kiocb])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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],[
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struct kiocb *iocb = NULL;
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struct iov_iter *iov = NULL;
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generic_write_checks(iocb, iov);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_GENERIC_WRITE_CHECKS_KIOCB, 1,
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[generic_write_checks() takes kiocb])
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],[
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AC_MSG_RESULT(no)
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])
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])
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