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Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull iov_iter updates from Al Viro:

 - bio_{map,copy}_user_iov() series; those are cleanups - fixes from the
   same pile went into mainline (and stable) in late September.

 - fs/iomap.c iov_iter-related fixes

 - new primitive - iov_iter_for_each_range(), which applies a function
   to kernel-mapped segments of an iov_iter.

   Usable for kvec and bvec ones, the latter does kmap()/kunmap() around
   the callback. _Not_ usable for iovec- or pipe-backed iov_iter; the
   latter is not hard to fix if the need ever appears, the former is by
   design.

   Another related primitive will have to wait for the next cycle - it
   passes page + offset + size instead of pointer + size, and that one
   will be usable for everything _except_ kvec. Unfortunately, that one
   didn't get exposure in -next yet, so...

 - a bit more lustre iov_iter work, including a use case for
   iov_iter_for_each_range() (checksum calculation)

 - vhost/scsi leak fix in failure exit

 - misc cleanups and detritectomy...

* 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (21 commits)
  iomap_dio_actor(): fix iov_iter bugs
  switch ksocknal_lib_recv_...() to use of iov_iter_for_each_range()
  lustre: switch struct ksock_conn to iov_iter
  vhost/scsi: switch to iov_iter_get_pages()
  fix a page leak in vhost_scsi_iov_to_sgl() error recovery
  new primitive: iov_iter_for_each_range()
  lnet_return_rx_credits_locked: don't abuse list_entry
  xen: don't open-code iov_iter_kvec()
  orangefs: remove detritus from struct orangefs_kiocb_s
  kill iov_shorten()
  bio_alloc_map_data(): do bmd->iter setup right there
  bio_copy_user_iov(): saner bio size calculation
  bio_map_user_iov(): get rid of copying iov_iter
  bio_copy_from_iter(): get rid of copying iov_iter
  move more stuff down into bio_copy_user_iov()
  blk_rq_map_user_iov(): move iov_iter_advance() down
  bio_map_user_iov(): get rid of the iov_for_each()
  bio_map_user_iov(): move alignment check into the main loop
  don't rely upon subsequent bio_add_pc_page() calls failing
  ... and with iov_iter_get_pages_alloc() it becomes even simpler
  ...
This commit is contained in:
Linus Torvalds
2017-11-17 12:08:18 -08:00
parent 93f30c73ec cfe057f7db
commit 16382e17c0
15 changed files with 201 additions and 439 deletions
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16
drivers/xen/pvcalls-back.c
View File

@@ -134,20 +134,16 @@ static void pvcalls_conn_back_read(void *opaque)
masked_cons = pvcalls_mask(cons, array_size);
memset(&msg, 0, sizeof(msg));
msg.msg_iter.type = ITER_KVEC|WRITE;
msg.msg_iter.count = wanted;
if (masked_prod < masked_cons) {
vec[0].iov_base = data->in + masked_prod;
vec[0].iov_len = wanted;
msg.msg_iter.kvec = vec;
msg.msg_iter.nr_segs = 1;
iov_iter_kvec(&msg.msg_iter, ITER_KVEC|WRITE, vec, 1, wanted);
} else {
vec[0].iov_base = data->in + masked_prod;
vec[0].iov_len = array_size - masked_prod;
vec[1].iov_base = data->in;
vec[1].iov_len = wanted - vec[0].iov_len;
msg.msg_iter.kvec = vec;
msg.msg_iter.nr_segs = 2;
iov_iter_kvec(&msg.msg_iter, ITER_KVEC|WRITE, vec, 2, wanted);
}
atomic_set(&map->read, 0);
@@ -196,20 +192,16 @@ static void pvcalls_conn_back_write(struct sock_mapping *map)
memset(&msg, 0, sizeof(msg));
msg.msg_flags |= MSG_DONTWAIT;
msg.msg_iter.type = ITER_KVEC|READ;
msg.msg_iter.count = size;
if (pvcalls_mask(prod, array_size) > pvcalls_mask(cons, array_size)) {
vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
vec[0].iov_len = size;
msg.msg_iter.kvec = vec;
msg.msg_iter.nr_segs = 1;
iov_iter_kvec(&msg.msg_iter, ITER_KVEC|READ, vec, 1, size);
} else {
vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
vec[0].iov_len = array_size - pvcalls_mask(cons, array_size);
vec[1].iov_base = data->out;
vec[1].iov_len = size - vec[0].iov_len;
msg.msg_iter.kvec = vec;
msg.msg_iter.nr_segs = 2;
iov_iter_kvec(&msg.msg_iter, ITER_KVEC|READ, vec, 2, size);
}
atomic_set(&map->write, 0);