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| author | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:50:00 +1100 |
|---|---|---|
| committer | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:50:30 +1100 |
| commit | 73598611ade7c85f0c3d52ba5130103f6709c6d3 (patch) | |
| tree | 51b54051c2b41cb712db0c47b9e595dafc09c8f3 | |
| parent | 1e1743ebe35ec7e3c1fa732408358fbc614cbbe5 (diff) | |
| download | lwn-73598611ade7c85f0c3d52ba5130103f6709c6d3.tar.gz lwn-73598611ade7c85f0c3d52ba5130103f6709c6d3.zip | |
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.c | 7 | ||||
| -rw-r--r-- | fs/ext3/acl.c | 7 | ||||
| -rw-r--r-- | 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 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)) |