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xfs: provide simple rcu-walk ACL implementation

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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>
This commit is contained in:
Nick Piggin
2011-01-07 17:50:02 +11:00
parent 258a5aa8df
commit 880566e17c
1 changed files with 6 additions and 3 deletions
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9
fs/xfs/linux-2.6/xfs_acl.c
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@@ -225,9 +225,6 @@ xfs_check_acl(struct inode *inode, int mask, unsigned int flags)
struct posix_acl *acl; struct posix_acl *acl;
int error = -EAGAIN; int error = -EAGAIN;
if (flags & IPERM_FLAG_RCU)
return -ECHILD;
ip = XFS_I(inode); ip = XFS_I(inode);
trace_xfs_check_acl(ip); trace_xfs_check_acl(ip);
@@ -238,6 +235,12 @@ xfs_check_acl(struct inode *inode, int mask, unsigned int flags)
if (!XFS_IFORK_Q(ip)) if (!XFS_IFORK_Q(ip))
return -EAGAIN; return -EAGAIN;
if (flags & IPERM_FLAG_RCU) {
if (!negative_cached_acl(inode, ACL_TYPE_ACCESS))
return -ECHILD;
return -EAGAIN;
}
acl = xfs_get_acl(inode, ACL_TYPE_ACCESS); acl = xfs_get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl)) if (IS_ERR(acl))
return PTR_ERR(acl); return PTR_ERR(acl);