Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs updates from Al Viro:
 "This the bunch that sat in -next + lock_parent() fix.  This is the
  minimal set; there's more pending stuff.

  In particular, I really hope to get acct.c fixes merged this cycle -
  we need that to deal sanely with delayed-mntput stuff.  In the next
  pile, hopefully - that series is fairly short and localized
  (kernel/acct.c, fs/super.c and fs/namespace.c).  In this pile: more
  iov_iter work.  Most of prereqs for ->splice_write with sane locking
  order are there and Kent's dio rewrite would also fit nicely on top of
  this pile"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (70 commits)
  lock_parent: don't step on stale ->d_parent of all-but-freed one
  kill generic_file_splice_write()
  ceph: switch to iter_file_splice_write()
  shmem: switch to iter_file_splice_write()
  nfs: switch to iter_splice_write_file()
  fs/splice.c: remove unneeded exports
  ocfs2: switch to iter_file_splice_write()
  ->splice_write() via ->write_iter()
  bio_vec-backed iov_iter
  optimize copy_page_{to,from}_iter()
  bury generic_file_aio_{read,write}
  lustre: get rid of messing with iovecs
  ceph: switch to ->write_iter()
  ceph_sync_direct_write: stop poking into iov_iter guts
  ceph_sync_read: stop poking into iov_iter guts
  new helper: copy_page_from_iter()
  fuse: switch to ->write_iter()
  btrfs: switch to ->write_iter()
  ocfs2: switch to ->write_iter()
  xfs: switch to ->write_iter()
  ...

1 files changed, 18 insertions, 29 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7fa5f7fd7bc7..8925f66a1411 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7445,39 +7445,30 @@ free_ordered:
 }
 
 static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb,
-                        const struct iovec *iov, loff_t offset,
-                        unsigned long nr_segs)
+                        const struct iov_iter *iter, loff_t offset)
 {
         int seg;
         int i;
-        size_t size;
-        unsigned long addr;
         unsigned blocksize_mask = root->sectorsize - 1;
         ssize_t retval = -EINVAL;
-        loff_t end = offset;
 
         if (offset & blocksize_mask)
                 goto out;
 
-        /* Check the memory alignment.  Blocks cannot straddle pages */
-        for (seg = 0; seg < nr_segs; seg++) {
-                addr = (unsigned long)iov[seg].iov_base;
-                size = iov[seg].iov_len;
-                end += size;
-                if ((addr & blocksize_mask) || (size & blocksize_mask))
-                        goto out;
-
-                /* If this is a write we don't need to check anymore */
-                if (rw & WRITE)
-                        continue;
+        if (iov_iter_alignment(iter) & blocksize_mask)
+                goto out;
 
-                /*
-                 * Check to make sure we don't have duplicate iov_base's in this
-                 * iovec, if so return EINVAL, otherwise we'll get csum errors
-                 * when reading back.
-                 */
-                for (i = seg + 1; i < nr_segs; i++) {
-                        if (iov[seg].iov_base == iov[i].iov_base)
+        /* If this is a write we don't need to check anymore */
+        if (rw & WRITE)
+                return 0;
+        /*
+         * Check to make sure we don't have duplicate iov_base's in this
+         * iovec, if so return EINVAL, otherwise we'll get csum errors
+         * when reading back.
+         */
+        for (seg = 0; seg < iter->nr_segs; seg++) {
+                for (i = seg + 1; i < iter->nr_segs; i++) {
+                        if (iter->iov[seg].iov_base == iter->iov[i].iov_base)
                                 goto out;
                 }
         }
@@ -7487,8 +7478,7 @@ out:
 }
 
 static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
-                        const struct iovec *iov, loff_t offset,
-                        unsigned long nr_segs)
+                        struct iov_iter *iter, loff_t offset)
 {
         struct file *file = iocb->ki_filp;
         struct inode *inode = file->f_mapping->host;
@@ -7498,8 +7488,7 @@ static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
         bool relock = false;
         ssize_t ret;
 
-        if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov,
-                            offset, nr_segs))
+        if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iter, offset))
                 return 0;
 
         atomic_inc(&inode->i_dio_count);
@@ -7511,7 +7500,7 @@ static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
          * we need to flush the dirty pages again to make absolutely sure
          * that any outstanding dirty pages are on disk.
          */
-        count = iov_length(iov, nr_segs);
+        count = iov_iter_count(iter);
         if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
                      &BTRFS_I(inode)->runtime_flags))
                 filemap_fdatawrite_range(inode->i_mapping, offset, count);
@@ -7538,7 +7527,7 @@ static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
 
         ret = __blockdev_direct_IO(rw, iocb, inode,
                         BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev,
-                        iov, offset, nr_segs, btrfs_get_blocks_direct, NULL,
+                        iter, offset, btrfs_get_blocks_direct, NULL,
                         btrfs_submit_direct, flags);
         if (rw & WRITE) {
                 if (ret < 0 && ret != -EIOCBQUEUED)