linux-kernel - [PATCH v2 4/5] jfs: cache NULL when both default

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Date:   Fri, 31 Aug 2018 22:33:51 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     jack@...e.com, tytso@....edu, adilger.kernel@...ger.ca,
        jaegeuk@...nel.org, yuchao0@...wei.com, shaggy@...nel.org,
        hubcap@...ibond.com, martin@...ibond.com
Cc:     devel@...ts.orangefs.org, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        jfs-discussion@...ts.sourceforge.net,
        Chengguang Xu <cgxu519@....com>
Subject: [PATCH v2 4/5] jfs: cache NULL when both default_acl and acl are NULL

default_acl and acl of newly created inode will be initiated
as ACL_NOT_CACHED in vfs function inode_init_always() and later
will be updated by calling xxx_init_acl() in specific filesystems.
Howerver, when default_acl and acl are NULL then they keep the value
of ACL_NOT_CACHED, this patch tries to cache NULL for acl/default_acl
in this case.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
v1->v2:
- Coding style change.

 fs/jfs/acl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index 2e71b6e7e646..8c06a6ea862d 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -146,12 +146,16 @@ int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
 	if (default_acl) {
 		rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
 		posix_acl_release(default_acl);
+	} else {
+		inode->i_default_acl = NULL;
 	}
 
 	if (acl) {
 		if (!rc)
 			rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
 		posix_acl_release(acl);
+	} else {
+		inode->i_acl = NULL;
 	}
 
 	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
-- 
2.17.1