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

Pull third hunk of vfs changes from Al Viro:
 "This contains the ->direct_IO() changes from Omar + saner
  generic_write_checks() + dealing with fcntl()/{read,write}() races
  (mirroring O_APPEND/O_DIRECT into iocb->ki_flags and instead of
  repeatedly looking at ->f_flags, which can be changed by fcntl(2),
  check ->ki_flags - which cannot) + infrastructure bits for dhowells'
  d_inode annotations + Christophs switch of /dev/loop to
  vfs_iter_write()"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (30 commits)
  block: loop: switch to VFS ITER_BVEC
  configfs: Fix inconsistent use of file_inode() vs file->f_path.dentry->d_inode
  VFS: Make pathwalk use d_is_reg() rather than S_ISREG()
  VFS: Fix up debugfs to use d_is_dir() in place of S_ISDIR()
  VFS: Combine inode checks with d_is_negative() and d_is_positive() in pathwalk
  NFS: Don't use d_inode as a variable name
  VFS: Impose ordering on accesses of d_inode and d_flags
  VFS: Add owner-filesystem positive/negative dentry checks
  nfs: generic_write_checks() shouldn't be done on swapout...
  ocfs2: use __generic_file_write_iter()
  mirror O_APPEND and O_DIRECT into iocb->ki_flags
  switch generic_write_checks() to iocb and iter
  ocfs2: move generic_write_checks() before the alignment checks
  ocfs2_file_write_iter: stop messing with ppos
  udf_file_write_iter: reorder and simplify
  fuse: ->direct_IO() doesn't need generic_write_checks()
  ext4_file_write_iter: move generic_write_checks() up
  xfs_file_aio_write_checks: switch to iocb/iov_iter
  generic_write_checks(): drop isblk argument
  blkdev_write_iter: expand generic_file_checks() call in there
  ...

1 files changed, 12 insertions, 24 deletions

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index c3929fb2ab26..682f65fe09b5 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -240,7 +240,6 @@ static int nfs_direct_cmp_commit_data_verf(struct nfs_direct_req *dreq,
 
 /**
  * nfs_direct_IO - NFS address space operation for direct I/O
- * @rw: direction (read or write)
  * @iocb: target I/O control block
  * @iov: array of vectors that define I/O buffer
  * @pos: offset in file to begin the operation
@@ -251,7 +250,7 @@ static int nfs_direct_cmp_commit_data_verf(struct nfs_direct_req *dreq,
  * shunt off direct read and write requests before the VFS gets them,
  * so this method is only ever called for swap.
  */
-ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t pos)
+ssize_t nfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t pos)
 {
 	struct inode *inode = iocb->ki_filp->f_mapping->host;
 
@@ -267,9 +266,9 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t
 #else
 	VM_BUG_ON(iov_iter_count(iter) != PAGE_SIZE);
 
-	if (rw == READ)
+	if (iov_iter_rw(iter) == READ)
 		return nfs_file_direct_read(iocb, iter, pos);
-	return nfs_file_direct_write(iocb, iter, pos);
+	return nfs_file_direct_write(iocb, iter);
 #endif /* CONFIG_NFS_SWAP */
 }
 
@@ -960,8 +959,7 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
  * Note that O_APPEND is not supported for NFS direct writes, as there
  * is no atomic O_APPEND write facility in the NFS protocol.
  */
-ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
-				loff_t pos)
+ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
 {
 	ssize_t result = -EINVAL;
 	struct file *file = iocb->ki_filp;
@@ -969,25 +967,16 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
 	struct inode *inode = mapping->host;
 	struct nfs_direct_req *dreq;
 	struct nfs_lock_context *l_ctx;
-	loff_t end;
-	size_t count = iov_iter_count(iter);
-	end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
-
-	nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES, count);
+	loff_t pos, end;
 
 	dfprintk(FILE, "NFS: direct write(%pD2, %zd@%Ld)\n",
-		file, count, (long long) pos);
+		file, iov_iter_count(iter), (long long) iocb->ki_pos);
 
-	result = generic_write_checks(file, &pos, &count, 0);
-	if (result)
-		goto out;
+	nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES,
+		      iov_iter_count(iter));
 
-	result = -EINVAL;
-	if ((ssize_t) count < 0)
-		goto out;
-	result = 0;
-	if (!count)
-		goto out;
+	pos = iocb->ki_pos;
+	end = (pos + iov_iter_count(iter) - 1) >> PAGE_CACHE_SHIFT;
 
 	mutex_lock(&inode->i_mutex);
 
@@ -1002,7 +991,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
 			goto out_unlock;
 	}
 
-	task_io_account_write(count);
+	task_io_account_write(iov_iter_count(iter));
 
 	result = -ENOMEM;
 	dreq = nfs_direct_req_alloc();
@@ -1010,7 +999,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
 		goto out_unlock;
 
 	dreq->inode = inode;
-	dreq->bytes_left = count;
+	dreq->bytes_left = iov_iter_count(iter);
 	dreq->io_start = pos;
 	dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
 	l_ctx = nfs_get_lock_context(dreq->ctx);
@@ -1050,7 +1039,6 @@ out_release:
 	nfs_direct_req_release(dreq);
 out_unlock:
 	mutex_unlock(&inode->i_mutex);
-out:
 	return result;
 }