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NFS: Convert nfs_get_lock_context to return an ERR_PTR on failure

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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: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-08-13 17:15:50 -04:00
parent a11a2bf4de
commit b3c54de6f8
3 changed files with 18 additions and 8 deletions
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16
fs/nfs/direct.c
View file

@ -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;

2
fs/nfs/inode.c
View file

@ -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);

8
fs/nfs/pagelist.c
View file

@ -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