The .write/.read file operations callbacks can be retired since
support for .read_iter/.write_iter and .aio_read/.aio_write has
been added. The vfs_write()/vfs_read() entry functions will
select the correct interface for the kernel. This is desirable
because all VFS write/read operations now rely on common code.
This change also add the generic write checks to make sure that
ulimits are enforced correctly on write.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Closes#5587Closes#5673
Linux 3.15 commit torvalds/linux@293bc98 introduced two new methods.
The ->read_iter() and ->write_iter() methods were designed to replace
the ->aio_read() and ->aio_write() interfaces. Both interfaces were
preserved for several kernel releases in order to migrate all existing
consumers to the new interfaces. But as of Linux 4.1 the legacy
interface has been retired and the ZFS code must be updated to use
the new interfaces.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#3352
