From 73598611ade7c85f0c3d52ba5130103f6709c6d3 Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Fri, 7 Jan 2011 17:50:00 +1100 Subject: [PATCH] ext2,3,4: provide simple rcu-walk ACL implementation This simple implementation just checks for no ACLs on the inode, and if so, then the rcu-walk may proceed, otherwise fail it. Signed-off-by: Nick Piggin --- fs/ext2/acl.c | 7 +++++-- fs/ext3/acl.c | 7 +++++-- fs/ext4/acl.c | 7 +++++-- 3 files changed, 15 insertions(+), 6 deletions(-) diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c index dd9bb3f..7b41805 100644 --- a/fs/ext2/acl.c +++ b/fs/ext2/acl.c @@ -236,8 +236,11 @@ ext2_check_acl(struct inode *inode, int mask, unsigned int flags) { struct posix_acl *acl; - if (flags & IPERM_FLAG_RCU) - return -ECHILD; + if (flags & IPERM_FLAG_RCU) { + if (!negative_cached_acl(inode, ACL_TYPE_ACCESS)) + return -ECHILD; + return -EAGAIN; + } acl = ext2_get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl)) diff --git a/fs/ext3/acl.c b/fs/ext3/acl.c index 9e49da8..e4fa49e 100644 --- a/fs/ext3/acl.c +++ b/fs/ext3/acl.c @@ -244,8 +244,11 @@ ext3_check_acl(struct inode *inode, int mask, unsigned int flags) { struct posix_acl *acl; - if (flags & IPERM_FLAG_RCU) - return -ECHILD; + if (flags & IPERM_FLAG_RCU) { + if (!negative_cached_acl(inode, ACL_TYPE_ACCESS)) + return -ECHILD; + return -EAGAIN; + } acl = ext3_get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl)) diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c index 373dcae..e0270d1 100644 --- a/fs/ext4/acl.c +++ b/fs/ext4/acl.c @@ -242,8 +242,11 @@ ext4_check_acl(struct inode *inode, int mask, unsigned int flags) { struct posix_acl *acl; - if (flags & IPERM_FLAG_RCU) - return -ECHILD; + if (flags & IPERM_FLAG_RCU) { + if (!negative_cached_acl(inode, ACL_TYPE_ACCESS)) + return -ECHILD; + return -EAGAIN; + } acl = ext4_get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl)) -- 2.7.4