From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org ([198.137.202.133]:47018 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733024AbeGKVIx (ORCPT ); Wed, 11 Jul 2018 17:08:53 -0400 From: Matthew Wilcox To: Dominique Martinet Cc: Matthew Wilcox , v9fs-developer@lists.sourceforge.net, Latchesar Ionkov , Eric Van Hensbergen , Ron Minnich , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v2 2/6] 9p: Change p9_fid_create calling convention Date: Wed, 11 Jul 2018 14:02:21 -0700 Message-Id: <20180711210225.19730-3-willy@infradead.org> In-Reply-To: <20180711210225.19730-1-willy@infradead.org> References: <20180711210225.19730-1-willy@infradead.org> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Return NULL instead of ERR_PTR when we can't allocate a FID. The ENOSPC return value was getting all the way back to userspace, and that's confusing for a userspace program which isn't expecting read() to tell it there's no space left on the filesystem. The best error we can return to indicate a temporary failure caused by lack of client resources is ENOMEM. Maybe it would be better to sleep until a FID is available, but that's not a change I'm comfortable making. Signed-off-by: Matthew Wilcox --- net/9p/client.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-) diff --git a/net/9p/client.c b/net/9p/client.c index 999eceb8af98..389a2904b7b3 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -913,13 +913,11 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt) p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); if (!fid) - return ERR_PTR(-ENOMEM); + return NULL; ret = p9_idpool_get(clnt->fidpool); - if (ret < 0) { - ret = -ENOSPC; + if (ret < 0) goto error; - } fid->fid = ret; memset(&fid->qid, 0, sizeof(struct p9_qid)); @@ -935,7 +933,7 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt) error: kfree(fid); - return ERR_PTR(ret); + return NULL; } static void p9_fid_destroy(struct p9_fid *fid) @@ -1137,9 +1135,8 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", afid ? afid->fid : -1, uname, aname); fid = p9_fid_create(clnt); - if (IS_ERR(fid)) { - err = PTR_ERR(fid); - fid = NULL; + if (!fid) { + err = -ENOMEM; goto error; } fid->uid = n_uname; @@ -1188,9 +1185,8 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, clnt = oldfid->clnt; if (clone) { fid = p9_fid_create(clnt); - if (IS_ERR(fid)) { - err = PTR_ERR(fid); - fid = NULL; + if (!fid) { + err = -ENOMEM; goto error; } @@ -2018,9 +2014,8 @@ struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, err = 0; clnt = file_fid->clnt; attr_fid = p9_fid_create(clnt); - if (IS_ERR(attr_fid)) { - err = PTR_ERR(attr_fid); - attr_fid = NULL; + if (!attr_fid) { + err = -ENOMEM; goto error; } p9_debug(P9_DEBUG_9P, -- 2.18.0