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Commit 18290650 authored by Trond Myklebust's avatar Trond Myklebust
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NFS: Move buffered I/O locking into nfs_file_write() 



Preparation for the patch that de-serialises O_DIRECT reads and
writes.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 89698b24

fs/nfs/file.c

+15 −12
Original line number Diff line number Diff line
@@ -623,7 +623,6 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from) 
	struct inode *inode = file_inode(file);

	unsigned long written = 0;

	ssize_t result;

	size_t count = iov_iter_count(from);



	result = nfs_key_timeout_notify(file, inode);

	if (result)
@@ -633,9 +632,8 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from) 
		return nfs_file_direct_write(iocb, from);



	dprintk("NFS: write(%pD2, %zu@%Ld)\n",

		file, count, (long long) iocb->ki_pos);

		file, iov_iter_count(from), (long long) iocb->ki_pos);



	result = -EBUSY;

	if (IS_SWAPFILE(inode))

		goto out_swapfile;

	/*
@@ -647,28 +645,33 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from) 
			goto out;

	}



	result = count;

	if (!count)

	inode_lock(inode);

	result = generic_write_checks(iocb, from);

	if (result > 0) {

		current->backing_dev_info = inode_to_bdi(inode);

		result = generic_perform_write(file, from, iocb->ki_pos);

		current->backing_dev_info = NULL;

	}

	inode_unlock(inode);

	if (result <= 0)

		goto out;



	result = generic_file_write_iter(iocb, from);

	if (result > 0)

		written = result;

	written = generic_write_sync(iocb, result);

	iocb->ki_pos += written;



	/* Return error values */

	if (result >= 0 && nfs_need_check_write(file, inode)) {

	if (nfs_need_check_write(file, inode)) {

		int err = vfs_fsync(file, 0);

		if (err < 0)

			result = err;

	}

	if (result > 0)

	nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);

out:

	return result;



out_swapfile:

	printk(KERN_INFO "NFS: attempt to write to active swap file!\n");

	goto out;

	return -EBUSY;

}

EXPORT_SYMBOL_GPL(nfs_file_write);