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authorNick Piggin <npiggin@kernel.dk>2011-01-07 01:49:59 -0500
committerNick Piggin <npiggin@kernel.dk>2011-01-07 01:50:29 -0500
commit1e1743ebe35ec7e3c1fa732408358fbc614cbbe5 (patch)
tree9654cd50bb29a4c5ccc498b9b08cc385288bc854 /include
parentb74c79e99389cd79b31fcc08f82c24e492e63c7e (diff)
fs: provide simple rcu-walk generic_check_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. This could easily be extended to put acls under RCU and check them under seqlock, if need be. But this implementation is enough to show the rcu-walk aware permissions code for path lookups is working, and will handle cases where there are no ACLs or ACLs in just the final element. This patch implicity converts tmpfs to rcu-aware permission check. Subsequent patches onvert ext*, xfs, and, btrfs. Each of these uses acl/permission code in a different way, so convert them all to provide templates and proof of concept. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/posix_acl.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 67608161df6b..d68283a898bb 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -108,6 +108,25 @@ static inline struct posix_acl *get_cached_acl(struct inode *inode, int type)
108 return acl; 108 return acl;
109} 109}
110 110
111static inline int negative_cached_acl(struct inode *inode, int type)
112{
113 struct posix_acl **p, *acl;
114 switch (type) {
115 case ACL_TYPE_ACCESS:
116 p = &inode->i_acl;
117 break;
118 case ACL_TYPE_DEFAULT:
119 p = &inode->i_default_acl;
120 break;
121 default:
122 BUG();
123 }
124 acl = ACCESS_ONCE(*p);
125 if (acl)
126 return 0;
127 return 1;
128}
129
111static inline void set_cached_acl(struct inode *inode, 130static inline void set_cached_acl(struct inode *inode,
112 int type, 131 int type,
113 struct posix_acl *acl) 132 struct posix_acl *acl)