linux-kernel - [PATCH 1/2] 9p: apply review requests for fid refcounting

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Date:   Thu, 19 Nov 2020 17:06:51 +0100
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Jianyong Wu <jianyong.wu@....com>, lucho@...kov.net,
        justin.he@....com, ericvh@...il.com, qemu_oss@...debyte.com,
        groug@...d.org, linux-kernel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        Dominique Martinet <asmadeus@...ewreck.org>
Subject: [PATCH 1/2] 9p: apply review requests for fid refcounting

Fix style issues in parent commit ("apply review requests for fid
refcounting"), no functional change.

Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
---
 fs/9p/fid.c             | 10 ++++------
 fs/9p/fid.h             |  2 +-
 include/net/9p/client.h |  2 +-
 net/9p/client.c         |  4 ++--
 4 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 89643dabcdae..50118ec72a92 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -28,7 +28,6 @@
 
 static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid)
 {
-	atomic_set(&fid->count, 1);
 	hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata);
 }
 
@@ -62,7 +61,7 @@ static struct p9_fid *v9fs_fid_find_inode(struct inode *inode, kuid_t uid)
 		}
 	}
 	if (ret && !IS_ERR(ret))
-		atomic_inc(&ret->count);
+		refcount_inc(&ret->count);
 	spin_unlock(&inode->i_lock);
 	return ret;
 }
@@ -77,7 +76,6 @@ static struct p9_fid *v9fs_fid_find_inode(struct inode *inode, kuid_t uid)
 void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid)
 {
 	spin_lock(&inode->i_lock);
-	atomic_set(&fid->count, 1);
 	hlist_add_head(&fid->ilist, (struct hlist_head *)&inode->i_private);
 	spin_unlock(&inode->i_lock);
 }
@@ -110,7 +108,7 @@ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any)
 		hlist_for_each_entry(fid, h, dlist) {
 			if (any || uid_eq(fid->uid, uid)) {
 				ret = fid;
-				atomic_inc(&ret->count);
+				refcount_inc(&ret->count);
 				break;
 			}
 		}
@@ -201,7 +199,7 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
 	}
 	/* If we are root ourself just return that */
 	if (dentry->d_sb->s_root == dentry) {
-		atomic_inc(&fid->count);
+		refcount_inc(&fid->count);
 		return fid;
 	}
 	/*
@@ -250,7 +248,7 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
 			fid = ERR_PTR(-ENOENT);
 		} else {
 			__add_fid(dentry, fid);
-			atomic_inc(&fid->count);
+			refcount_inc(&fid->count);
 			spin_unlock(&dentry->d_lock);
 		}
 	}
diff --git a/fs/9p/fid.h b/fs/9p/fid.h
index 1fed96546728..f7f33509e169 100644
--- a/fs/9p/fid.h
+++ b/fs/9p/fid.h
@@ -28,7 +28,7 @@ static inline struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
 	if (!fid || IS_ERR(fid))
 		return fid;
 
-	nfid = p9_client_walk(fid, 0, NULL, 1);
+	nfid = clone_fid(fid);
 	p9_client_clunk(fid);
 	return nfid;
 }
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 58ed9bd306bd..e1c308d8d288 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -149,7 +149,7 @@ enum fid_source {
 struct p9_fid {
 	struct p9_client *clnt;
 	u32 fid;
-	atomic_t count;
+	refcount_t count;
 	int mode;
 	struct p9_qid qid;
 	u32 iounit;
diff --git a/net/9p/client.c b/net/9p/client.c
index a6c8a915e0d8..ba4910138c5b 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -901,7 +901,7 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 	fid->clnt = clnt;
 	fid->rdir = NULL;
 	fid->fid = 0;
-	atomic_set(&fid->count, 1);
+	refcount_set(&fid->count, 1);
 
 	idr_preload(GFP_KERNEL);
 	spin_lock_irq(&clnt->lock);
@@ -1466,7 +1466,7 @@ int p9_client_clunk(struct p9_fid *fid)
 		dump_stack();
 		return 0;
 	}
-	if (!atomic_dec_and_test(&fid->count))
+	if (!refcount_dec_and_test(&fid->count))
 		return 0;
 
 again:
-- 
2.28.0