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authorAndreas Gruenbacher <agruen@suse.de>2005-06-22 21:16:27 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2005-06-23 00:07:25 +0400
commit5c6a9f7d92291c832d47e792ed1fafa44acb066e (patch)
treec67e62e0b46c22b061d5eb2b28ef702bdf2afa0d /fs/nfs/nfs3acl.c
parent055ffbea0596942579b0dae71d5dab78de8135f6 (diff)
downloadlinux-5c6a9f7d92291c832d47e792ed1fafa44acb066e.tar.xz
[PATCH] NFS: Cache the NFSv3 acls.
Attach acls to inodes in the icache to avoid unnecessary GETACL RPC round-trips. As long as the client doesn't retrieve any acls itself, only the default acls of exiting directories and the default and access acls of new directories will end up in the cache, which preserves some memory compared to always caching the access and default acl of all files. Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Acked-by: Olaf Kirch <okir@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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: