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Commit b3c54de6 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS: Convert nfs_get_lock_context to return an ERR_PTR on failure 



We want to be able to distinguish between allocation failures, and
the case where the lock context is not needed (because there are no
locks).

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent a11a2bf4

fs/nfs/direct.c

+12 −4
Original line number Diff line number Diff line
@@ -450,6 +450,7 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov, 
	ssize_t result = -ENOMEM;

	struct inode *inode = iocb->ki_filp->f_mapping->host;

	struct nfs_direct_req *dreq;

	struct nfs_lock_context *l_ctx;



	dreq = nfs_direct_req_alloc();

	if (dreq == NULL)
@@ -457,9 +458,12 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov, 


	dreq->inode = inode;

	dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));

	dreq->l_ctx = nfs_get_lock_context(dreq->ctx);

	if (dreq->l_ctx == NULL)

	l_ctx = nfs_get_lock_context(dreq->ctx);

	if (IS_ERR(l_ctx)) {

		result = PTR_ERR(l_ctx);

		goto out_release;

	}

	dreq->l_ctx = l_ctx;

	if (!is_sync_kiocb(iocb))

		dreq->iocb = iocb;
@@ -849,6 +853,7 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov, 
	ssize_t result = -ENOMEM;

	struct inode *inode = iocb->ki_filp->f_mapping->host;

	struct nfs_direct_req *dreq;

	struct nfs_lock_context *l_ctx;



	dreq = nfs_direct_req_alloc();

	if (!dreq)
@@ -856,9 +861,12 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov, 


	dreq->inode = inode;

	dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));

	dreq->l_ctx = nfs_get_lock_context(dreq->ctx);

	if (dreq->l_ctx == NULL)

	l_ctx = nfs_get_lock_context(dreq->ctx);

	if (IS_ERR(l_ctx)) {

		result = PTR_ERR(l_ctx);

		goto out_release;

	}

	dreq->l_ctx = l_ctx;

	if (!is_sync_kiocb(iocb))

		dreq->iocb = iocb;

fs/nfs/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -578,7 +578,7 @@ struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 
		spin_unlock(&inode->i_lock);

		new = kmalloc(sizeof(*new), GFP_KERNEL);

		if (new == NULL)

			return NULL;

			return ERR_PTR(-ENOMEM);

		nfs_init_lock_context(new);

		spin_lock(&inode->i_lock);

		res = __nfs_find_lock_context(ctx);

fs/nfs/pagelist.c

+5 −3
Original line number Diff line number Diff line
@@ -102,6 +102,7 @@ nfs_create_request(struct nfs_open_context *ctx, struct inode *inode, 
		   unsigned int offset, unsigned int count)

{

	struct nfs_page		*req;

	struct nfs_lock_context *l_ctx;



	/* try to allocate the request struct */

	req = nfs_page_alloc();
@@ -109,11 +110,12 @@ nfs_create_request(struct nfs_open_context *ctx, struct inode *inode, 
		return ERR_PTR(-ENOMEM);



	/* get lock context early so we can deal with alloc failures */

	req->wb_lock_context = nfs_get_lock_context(ctx);

	if (req->wb_lock_context == NULL) {

	l_ctx = nfs_get_lock_context(ctx);

	if (IS_ERR(l_ctx)) {

		nfs_page_free(req);

		return ERR_PTR(-ENOMEM);

		return ERR_CAST(l_ctx);

	}

	req->wb_lock_context = l_ctx;



	/* Initialize the request struct. Initially, we assume a

	 * long write-back delay. This will be adjusted in