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VZ 7 kernel compat: introduce ITER-enabled .direct_IO() via IOVECs

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Virtuozzo 7 kernels starting 3.10.0-1127.18.2.vz7.163.46
have the following configuration:

  * no HAVE_VFS_RW_ITERATE
  * HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET

=> let's add implementation of zpl_direct_IO() via
zpl_aio_{read,write}() in this case.

https://bugs.openvz.org/browse/OVZ-7243

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com>
Closes #11410 
Closes #11411
This commit is contained in:
Konstantin Khorenko 2020-12-31 01:18:29 +03:00 committed by Brian Behlendorf
parent 88ae76a4e0
commit 59570a05d8
1 changed files with 14 additions and 1 deletions
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15
module/os/linux/zfs/zpl_file.c
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@ -463,7 +463,7 @@ zpl_direct_IO(int rw, struct kiocb *kiocb, struct iov_iter *iter, loff_t pos)
#error "Unknown direct IO interface"
#endif
#else
#else /* HAVE_VFS_RW_ITERATE */
#if defined(HAVE_VFS_DIRECT_IO_IOVEC)
static ssize_t
@ -475,6 +475,19 @@ zpl_direct_IO(int rw, struct kiocb *kiocb, const struct iovec *iov,
else
return (zpl_aio_read(kiocb, iov, nr_segs, pos));
}
#elif defined(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET)
static ssize_t
zpl_direct_IO(int rw, struct kiocb *kiocb, struct iov_iter *iter, loff_t pos)
{
const struct iovec *iovp = iov_iter_iovec(iter);
unsigned long nr_segs = iter->nr_segs;
ASSERT3S(pos, ==, kiocb->ki_pos);
if (rw == WRITE)
return (zpl_aio_write(kiocb, iovp, nr_segs, pos));
else
return (zpl_aio_read(kiocb, iovp, nr_segs, pos));
}
#else
#error "Unknown direct IO interface"
#endif