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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:00 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:30 +1100
commit73598611ade7c85f0c3d52ba5130103f6709c6d3 (patch)
tree51b54051c2b41cb712db0c47b9e595dafc09c8f3
parent1e1743ebe35ec7e3c1fa732408358fbc614cbbe5 (diff)
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 <npiggin@kernel.dk>
-rw-r--r--fs/ext2/acl.c7
-rw-r--r--fs/ext3/acl.c7
-rw-r--r--fs/ext4/acl.c7
3 files changed, 15 insertions, 6 deletions
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index dd9bb3f0c8d7..7b4180554a62 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 9e49da8302d3..e4fa49e6c539 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 373dcaeedba9..e0270d1f8d82 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))