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Diffstat (limited to 'fs/nfs/nfs3acl.c')
-rw-r--r--fs/nfs/nfs3acl.c100
1 files changed, 85 insertions, 15 deletions
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
index 89b6468700e7..451112ff9aa4 100644
--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -113,6 +113,69 @@ int nfs3_removexattr(struct dentry *dentry, const char *name)
return nfs3_proc_setacl(inode, type, NULL);
}
+static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
+{
+ if (nfsi->acl_access != ERR_PTR(-EAGAIN)) {
+ posix_acl_release(nfsi->acl_access);
+ nfsi->acl_access = ERR_PTR(-EAGAIN);
+ }
+ if (nfsi->acl_default != ERR_PTR(-EAGAIN)) {
+ posix_acl_release(nfsi->acl_default);
+ nfsi->acl_default = ERR_PTR(-EAGAIN);
+ }
+}
+
+void nfs3_forget_cached_acls(struct inode *inode)
+{
+ dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
+ inode->i_ino);
+ spin_lock(&inode->i_lock);
+ __nfs3_forget_cached_acls(NFS_I(inode));
+ spin_unlock(&inode->i_lock);
+}
+
+static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct posix_acl *acl = ERR_PTR(-EAGAIN);
+
+ spin_lock(&inode->i_lock);
+ switch(type) {
+ case ACL_TYPE_ACCESS:
+ acl = nfsi->acl_access;
+ break;
+
+ case ACL_TYPE_DEFAULT:
+ acl = nfsi->acl_default;
+ break;
+
+ default:
+ return ERR_PTR(-EINVAL);
+ }
+ if (acl == ERR_PTR(-EAGAIN))
+ acl = ERR_PTR(-EAGAIN);
+ else
+ acl = posix_acl_dup(acl);
+ spin_unlock(&inode->i_lock);
+ dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
+ inode->i_ino, type, acl);
+ return acl;
+}
+
+static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl,
+ struct posix_acl *dfacl)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
+ inode->i_ino, acl, dfacl);
+ spin_lock(&inode->i_lock);
+ __nfs3_forget_cached_acls(NFS_I(inode));
+ nfsi->acl_access = posix_acl_dup(acl);
+ nfsi->acl_default = posix_acl_dup(dfacl);
+ spin_unlock(&inode->i_lock);
+}
+
struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
{
struct nfs_server *server = NFS_SERVER(inode);
@@ -126,26 +189,32 @@ struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
struct nfs3_getaclres res = {
.fattr = &fattr,
};
- struct posix_acl *acl = NULL;
+ struct posix_acl *acl;
int status, count;
if (!nfs_server_capable(inode, NFS_CAP_ACLS))
return ERR_PTR(-EOPNOTSUPP);
- switch (type) {
- case ACL_TYPE_ACCESS:
- args.mask = NFS_ACLCNT|NFS_ACL;
- break;
-
- case ACL_TYPE_DEFAULT:
- if (!S_ISDIR(inode->i_mode))
- return NULL;
- args.mask = NFS_DFACLCNT|NFS_DFACL;
- break;
-
- default:
- return ERR_PTR(-EINVAL);
- }
+ status = nfs_revalidate_inode(server, inode);
+ if (status < 0)
+ return ERR_PTR(status);
+ acl = nfs3_get_cached_acl(inode, type);
+ if (acl != ERR_PTR(-EAGAIN))
+ return acl;
+ acl = NULL;
+
+ /*
+ * Only get the access acl when explicitly requested: We don't
+ * need it for access decisions, and only some applications use
+ * it. Applications which request the access acl first are not
+ * penalized from this optimization.
+ */
+ if (type == ACL_TYPE_ACCESS)
+ args.mask |= NFS_ACLCNT|NFS_ACL;
+ if (S_ISDIR(inode->i_mode))
+ args.mask |= NFS_DFACLCNT|NFS_DFACL;
+ if (args.mask == 0)
+ return NULL;
dprintk("NFS call getacl\n");
status = rpc_call(server->client_acl, ACLPROC3_GETACL,
@@ -180,6 +249,7 @@ struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
res.acl_access = NULL;
}
}
+ nfs3_cache_acls(inode, res.acl_access, res.acl_default);
switch(type) {
case ACL_TYPE_ACCESS: