Merge branch 'work.splice_read' of git://git.kernel.org/pub/scm/linux/kernel/git...

Pull VFS splice updates from Al Viro:
 "There's a bunch of branches this cycle, both mine and from other folks
  and I'd rather send pull requests separately.

  This one is the conversion of ->splice_read() to ITER_PIPE iov_iter
  (and introduction of such). Gets rid of a lot of code in fs/splice.c
  and elsewhere; there will be followups, but these are for the next
  cycle...  Some pipe/splice-related cleanups from Miklos in the same
  branch as well"

* 'work.splice_read' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  pipe: fix comment in pipe_buf_operations
  pipe: add pipe_buf_steal() helper
  pipe: add pipe_buf_confirm() helper
  pipe: add pipe_buf_release() helper
  pipe: add pipe_buf_get() helper
  relay: simplify relay_file_read()
  switch default_file_splice_read() to use of pipe-backed iov_iter
  switch generic_file_splice_read() to use of ->read_iter()
  new iov_iter flavour: pipe-backed
  fuse_dev_splice_read(): switch to add_to_pipe()
  skb_splice_bits(): get rid of callback
  new helper: add_to_pipe()
  splice: lift pipe_lock out of splice_to_pipe()
  splice: switch get_iovec_page_array() to iov_iter
  splice_to_pipe(): don't open-code wakeup_pipe_readers()
  consistent treatment of EFAULT on O_DIRECT read/write

diff --cc drivers/staging/lustre/lustre/llite/file.c
index 6e3a188baaae37152d1413cd6e79161fb5c390d0,2567b09f4cfedd4e24fbad61c597a560670979fc..d56863ff5866d9bb91da86012a11781d462c87cb
--- 1/drivers/staging/lustre/lustre/llite/file.c
--- 2/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@@ -1130,59 -1150,26 +1130,45 @@@ restart
  
        if (cl_io_rw_init(env, io, iot, *ppos, count) == 0) {
                struct vvp_io *vio = vvp_env_io(env);
 -              int write_mutex_locked = 0;
 +              bool range_locked = false;
 +
 +              if (file->f_flags & O_APPEND)
 +                      range_lock_init(&range, 0, LUSTRE_EOF);
 +              else
 +                      range_lock_init(&range, *ppos, *ppos + count - 1);
  
                vio->vui_fd  = LUSTRE_FPRIVATE(file);
-               vio->vui_io_subtype = args->via_io_subtype;
+               vio->vui_iter = args->u.normal.via_iter;
+               vio->vui_iocb = args->u.normal.via_iocb;
 -              if ((iot == CIT_WRITE) &&
++              /*
++               * Direct IO reads must also take range lock,
++               * or multiple reads will try to work on the same pages
++               * See LU-6227 for details.
++               */
++              if (((iot == CIT_WRITE) ||
++                   (iot == CIT_READ && (file->f_flags & O_DIRECT))) &&
+                   !(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
 -                      if (mutex_lock_interruptible(&lli->lli_write_mutex)) {
 -                              result = -ERESTARTSYS;
++                      CDEBUG(D_VFSTRACE, "Range lock [%llu, %llu]\n",
++                             range.rl_node.in_extent.start,
++                             range.rl_node.in_extent.end);
++                      result = range_lock(&lli->lli_write_tree,
++                                          &range);
++                      if (result < 0)
+                               goto out;
 -                      }
 -                      write_mutex_locked = 1;
 +
-               switch (vio->vui_io_subtype) {
-               case IO_NORMAL:
-                       vio->vui_iter = args->u.normal.via_iter;
-                       vio->vui_iocb = args->u.normal.via_iocb;
-                       /*
-                        * Direct IO reads must also take range lock,
-                        * or multiple reads will try to work on the same pages
-                        * See LU-6227 for details.
-                        */
-                       if (((iot == CIT_WRITE) ||
-                            (iot == CIT_READ && (file->f_flags & O_DIRECT))) &&
-                           !(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
-                               CDEBUG(D_VFSTRACE, "Range lock [%llu, %llu]\n",
-                                      range.rl_node.in_extent.start,
-                                      range.rl_node.in_extent.end);
-                               result = range_lock(&lli->lli_write_tree,
-                                                   &range);
-                               if (result < 0)
-                                       goto out;
- 
-                               range_locked = true;
-                       }
-                       down_read(&lli->lli_trunc_sem);
-                       break;
-               case IO_SPLICE:
-                       vio->u.splice.vui_pipe = args->u.splice.via_pipe;
-                       vio->u.splice.vui_flags = args->u.splice.via_flags;
-                       break;
-               default:
-                       CERROR("Unknown IO type - %u\n", vio->vui_io_subtype);
-                       LBUG();
++                      range_locked = true;
                }
+               down_read(&lli->lli_trunc_sem);
                ll_cl_add(file, env, io);
                result = cl_io_loop(env, io);
                ll_cl_remove(file, env);
-               if (args->via_io_subtype == IO_NORMAL)
-                       up_read(&lli->lli_trunc_sem);
+               up_read(&lli->lli_trunc_sem);
 -              if (write_mutex_locked)
 -                      mutex_unlock(&lli->lli_write_mutex);
 +              if (range_locked) {
 +                      CDEBUG(D_VFSTRACE, "Range unlock [%llu, %llu]\n",
 +                             range.rl_node.in_extent.start,
 +                             range.rl_node.in_extent.end);
 +                      range_unlock(&lli->lli_write_tree, &range);
 +              }
        } else {
                /* cl_io_rw_init() handled IO */
                result = io->ci_result;
@@@ -1269,31 -1256,88 +1255,6 @@@ static ssize_t ll_file_write_iter(struc
        return result;
  }
  
- /*
-  * Send file content (through pagecache) somewhere with helper
-  */
- static ssize_t ll_file_splice_read(struct file *in_file, loff_t *ppos,
-                                  struct pipe_inode_info *pipe, size_t count,
-                                  unsigned int flags)
 -static int ll_lov_recreate(struct inode *inode, struct ost_id *oi, u32 ost_idx)
--{
-       struct lu_env      *env;
-       struct vvp_io_args *args;
-       ssize_t      result;
-       int              refcheck;
 -      struct obd_export *exp = ll_i2dtexp(inode);
 -      struct obd_trans_info oti = { 0 };
 -      struct obdo *oa = NULL;
 -      int lsm_size;
 -      int rc = 0;
 -      struct lov_stripe_md *lsm = NULL, *lsm2;
--
-       env = cl_env_get(&refcheck);
-       if (IS_ERR(env))
-               return PTR_ERR(env);
 -      oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 -      if (!oa)
 -              return -ENOMEM;
--
-       args = ll_env_args(env, IO_SPLICE);
-       args->u.splice.via_pipe = pipe;
-       args->u.splice.via_flags = flags;
 -      lsm = ccc_inode_lsm_get(inode);
 -      if (!lsm_has_objects(lsm)) {
 -              rc = -ENOENT;
 -              goto out;
 -      }
--
-       result = ll_file_io_generic(env, args, in_file, CIT_READ, ppos, count);
-       cl_env_put(env, &refcheck);
-       return result;
 -      lsm_size = sizeof(*lsm) + (sizeof(struct lov_oinfo) *
 -                 (lsm->lsm_stripe_count));
 -
 -      lsm2 = libcfs_kvzalloc(lsm_size, GFP_NOFS);
 -      if (!lsm2) {
 -              rc = -ENOMEM;
 -              goto out;
 -      }
 -
 -      oa->o_oi = *oi;
 -      oa->o_nlink = ost_idx;
 -      oa->o_flags |= OBD_FL_RECREATE_OBJS;
 -      oa->o_valid = OBD_MD_FLID | OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
 -      obdo_from_inode(oa, inode, OBD_MD_FLTYPE | OBD_MD_FLATIME |
 -                                 OBD_MD_FLMTIME | OBD_MD_FLCTIME);
 -      obdo_set_parent_fid(oa, &ll_i2info(inode)->lli_fid);
 -      memcpy(lsm2, lsm, lsm_size);
 -      ll_inode_size_lock(inode);
 -      rc = obd_create(NULL, exp, oa, &lsm2, &oti);
 -      ll_inode_size_unlock(inode);
 -
 -      kvfree(lsm2);
 -      goto out;
 -out:
 -      ccc_inode_lsm_put(inode, lsm);
 -      kmem_cache_free(obdo_cachep, oa);
 -      return rc;
 -}
 -
 -static int ll_lov_recreate_obj(struct inode *inode, unsigned long arg)
 -{
 -      struct ll_recreate_obj ucreat;
 -      struct ost_id           oi;
 -
 -      if (!capable(CFS_CAP_SYS_ADMIN))
 -              return -EPERM;
 -
 -      if (copy_from_user(&ucreat, (struct ll_recreate_obj __user *)arg,
 -                         sizeof(ucreat)))
 -              return -EFAULT;
 -
 -      ostid_set_seq_mdt0(&oi);
 -      ostid_set_id(&oi, ucreat.lrc_id);
 -      return ll_lov_recreate(inode, &oi, ucreat.lrc_ost_idx);
 -}
 -
 -static int ll_lov_recreate_fid(struct inode *inode, unsigned long arg)
 -{
 -      struct lu_fid   fid;
 -      struct ost_id   oi;
 -      u32             ost_idx;
 -
 -      if (!capable(CFS_CAP_SYS_ADMIN))
 -              return -EPERM;
 -
 -      if (copy_from_user(&fid, (struct lu_fid __user *)arg, sizeof(fid)))
 -              return -EFAULT;
 -
 -      fid_to_ostid(&fid, &oi);
 -      ost_idx = (fid_seq(&fid) >> 16) & 0xffff;
 -      return ll_lov_recreate(inode, &oi, ost_idx);
--}
--
  int ll_lov_setstripe_ea_info(struct inode *inode, struct dentry *dentry,
                             __u64 flags, struct lov_user_md *lum,
                             int lum_size)

diff --cc drivers/staging/lustre/lustre/llite/llite_internal.h
Simple merge

diff --cc drivers/staging/lustre/lustre/llite/vvp_internal.h
Simple merge

diff --cc drivers/staging/lustre/lustre/llite/vvp_io.c
Simple merge

diff --cc fs/fuse/dev.c
Simple merge

diff --cc fs/gfs2/file.c
Simple merge

diff --cc fs/xfs/xfs_file.c
Simple merge

diff --cc fs/xfs/xfs_trace.h
Simple merge

diff --cc include/linux/skbuff.h
Simple merge

diff --cc kernel/relay.c
Simple merge

diff --cc net/core/skbuff.c
Simple merge

diff --cc net/ipv4/tcp.c
Simple merge

diff --cc net/kcm/kcmsock.c
Simple merge