[PATCH] NFS: split nfsi->flags into two fields

Certain bits in nfsi->flags can be manipulated with atomic bitops, and some
are better manipulated via logical bitmask operations.

This patch splits the flags field into two.  The next patch introduces atomic
bitops for one of the fields.

Test plan:
 Millions of fsx ops on SMP clients.
Signed-off-by: Chuck Lever <cel@netapp.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfs/dir.c

@@ -189,7 +189,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
 		goto error;
 	}
 	SetPageUptodate(page);
-	NFS_FLAGS(inode) |= NFS_INO_INVALID_ATIME;
+	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
 	/* Ensure consistent page alignment of the data.
 	 * Note: assumes we have exclusive access to this mapping either
 	 *	 through inode->i_sem or some other mechanism.
@@ -462,7 +462,7 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
 						page,
 						NFS_SERVER(inode)->dtsize,
 						desc->plus);
-	NFS_FLAGS(inode) |= NFS_INO_INVALID_ATIME;
+	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
 	desc->page = page;
 	desc->ptr = kmap(page);		/* matching kunmap in nfs_do_filldir */
 	if (desc->error >= 0) {
@@ -608,7 +608,7 @@ static inline int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
 {
 	if (IS_ROOT(dentry))
 		return 1;
-	if ((NFS_FLAGS(dir) & NFS_INO_INVALID_ATTR) != 0
+	if ((NFS_I(dir)->cache_validity & NFS_INO_INVALID_ATTR) != 0
 			|| nfs_attribute_timeout(dir))
 		return 0;
 	return nfs_verify_change_attribute(dir, (unsigned long)dentry->d_fsdata);
@@ -1575,11 +1575,12 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
 int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
 {
-	struct nfs_access_entry *cache = &NFS_I(inode)->cache_access;
+	struct nfs_inode *nfsi = NFS_I(inode);
+	struct nfs_access_entry *cache = &nfsi->cache_access;
 
 	if (cache->cred != cred
 			|| time_after(jiffies, cache->jiffies + NFS_ATTRTIMEO(inode))
-			|| (NFS_FLAGS(inode) & NFS_INO_INVALID_ACCESS))
+			|| (nfsi->cache_validity & NFS_INO_INVALID_ACCESS))
 		return -ENOENT;
 	memcpy(res, cache, sizeof(*res));
 	return 0;
@@ -1587,14 +1588,15 @@ int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs
 
 void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
 {
-	struct nfs_access_entry *cache = &NFS_I(inode)->cache_access;
+	struct nfs_inode *nfsi = NFS_I(inode);
+	struct nfs_access_entry *cache = &nfsi->cache_access;
 
 	if (cache->cred != set->cred) {
 		if (cache->cred)
 			put_rpccred(cache->cred);
 		cache->cred = get_rpccred(set->cred);
 	}
-	NFS_FLAGS(inode) &= ~NFS_INO_INVALID_ACCESS;
+	nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS;
 	cache->jiffies = set->jiffies;
 	cache->mask = set->mask;
 }

fs/nfs/file.c

@@ -134,9 +134,10 @@ nfs_file_release(struct inode *inode, struct file *filp)
  */
 static int nfs_revalidate_file(struct inode *inode, struct file *filp)
 {
+	struct nfs_inode *nfsi = NFS_I(inode);
 	int retval = 0;
 
-	if ((NFS_FLAGS(inode) & NFS_INO_REVAL_PAGECACHE) || nfs_attribute_timeout(inode))
+	if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) || nfs_attribute_timeout(inode))
 		retval = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
 	nfs_revalidate_mapping(inode, filp->f_mapping);
 	return 0;
@@ -164,7 +165,7 @@ static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
 		goto force_reval;
 	if (nfsi->npages != 0)
 		return 0;
-	if (!(NFS_FLAGS(inode) & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode))
+	if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode))
 		return 0;
 force_reval:
 	return __nfs_revalidate_inode(server, inode);

fs/nfs/inode.c

@@ -620,9 +620,9 @@ nfs_zap_caches(struct inode *inode)
 
 	memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
 	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
-		nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
 	else
-		nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
 }
 
 static void nfs_zap_acl_cache(struct inode *inode)
@@ -632,7 +632,7 @@ static void nfs_zap_acl_cache(struct inode *inode)
 	clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
 	if (clear_acl_cache != NULL)
 		clear_acl_cache(inode);
-	NFS_I(inode)->flags &= ~NFS_INO_INVALID_ACL;
+	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
 }
 
 /*
@@ -841,7 +841,7 @@ void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
 			inode->i_uid = attr->ia_uid;
 		if ((attr->ia_valid & ATTR_GID) != 0)
 			inode->i_gid = attr->ia_gid;
-		NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
 	}
 	if ((attr->ia_valid & ATTR_SIZE) != 0) {
 		inode->i_size = attr->ia_size;
@@ -872,8 +872,7 @@ nfs_wait_on_inode(struct inode *inode, int flag)
 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 {
 	struct inode *inode = dentry->d_inode;
-	struct nfs_inode *nfsi = NFS_I(inode);
-	int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME;
+	int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
 	int err;
 
 	if (__IS_FLG(inode, MS_NOATIME))
@@ -1019,7 +1018,7 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 	struct nfs_fattr fattr;
 	struct nfs_inode *nfsi = NFS_I(inode);
 	unsigned long verifier;
-	unsigned int flags;
+	unsigned long cache_validity;
 
 	dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
 		inode->i_sb->s_id, (long long)NFS_FILEID(inode));
@@ -1036,7 +1035,7 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 			goto out_nowait;
 		if (NFS_ATTRTIMEO(inode) == 0)
 			continue;
-		if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME))
+		if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME))
 			continue;
 		status = NFS_STALE(inode) ? -ESTALE : 0;
 		goto out_nowait;
@@ -1065,18 +1064,21 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 			 (long long)NFS_FILEID(inode), status);
 		goto out;
 	}
-	flags = nfsi->flags;
-	nfsi->flags &= ~NFS_INO_REVAL_PAGECACHE;
+	cache_validity = nfsi->cache_validity;
+	nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
+
 	/*
 	 * We may need to keep the attributes marked as invalid if
 	 * we raced with nfs_end_attr_update().
 	 */
 	if (verifier == nfsi->cache_change_attribute)
-		nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
-	/* Do the page cache invalidation */
+		nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
+
 	nfs_revalidate_mapping(inode, inode->i_mapping);
-	if (flags & NFS_INO_INVALID_ACL)
+
+	if (cache_validity & NFS_INO_INVALID_ACL)
 		nfs_zap_acl_cache(inode);
+
 	dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
 		inode->i_sb->s_id,
 		(long long)NFS_FILEID(inode));
@@ -1107,7 +1109,7 @@ int nfs_attribute_timeout(struct inode *inode)
  */
 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 {
-	if (!(NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
+	if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
 			&& !nfs_attribute_timeout(inode))
 		return NFS_STALE(inode) ? -ESTALE : 0;
 	return __nfs_revalidate_inode(server, inode);
@@ -1122,14 +1124,14 @@ void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 
-	if (nfsi->flags & NFS_INO_INVALID_DATA) {
+	if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
 		if (S_ISREG(inode->i_mode)) {
 			if (filemap_fdatawrite(mapping) == 0)
 				filemap_fdatawait(mapping);
 			nfs_wb_all(inode);
 		}
 		invalidate_inode_pages2(mapping);
-		nfsi->flags &= ~NFS_INO_INVALID_DATA;
+		nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
 		if (S_ISDIR(inode->i_mode)) {
 			memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
 			/* This ensures we revalidate child dentries */
@@ -1164,10 +1166,10 @@ void nfs_end_data_update(struct inode *inode)
 
 	if (!nfs_have_delegation(inode, FMODE_READ)) {
 		/* Mark the attribute cache for revalidation */
-		nfsi->flags |= NFS_INO_INVALID_ATTR;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 		/* Directories and symlinks: invalidate page cache too */
 		if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
-			nfsi->flags |= NFS_INO_INVALID_DATA;
+			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 	}
 	nfsi->cache_change_attribute ++;
 	atomic_dec(&nfsi->data_updates);
@@ -1200,9 +1202,9 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
 				&& nfsi->change_attr == fattr->pre_change_attr)
 			nfsi->change_attr = fattr->change_attr;
 		if (nfsi->change_attr != fattr->change_attr) {
-			nfsi->flags |= NFS_INO_INVALID_ATTR;
+			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 			if (!data_unstable)
-				nfsi->flags |= NFS_INO_REVAL_PAGECACHE;
+				nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
 		}
 	}
 
@@ -1227,28 +1229,28 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
 
 	/* Verify a few of the more important attributes */
 	if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
-		nfsi->flags |= NFS_INO_INVALID_ATTR;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 		if (!data_unstable)
-			nfsi->flags |= NFS_INO_REVAL_PAGECACHE;
+			nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
 	}
 	if (cur_size != new_isize) {
-		nfsi->flags |= NFS_INO_INVALID_ATTR;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 		if (nfsi->npages == 0)
-			nfsi->flags |= NFS_INO_REVAL_PAGECACHE;
+			nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
 	}
 
 	/* Have any file permissions changed? */
 	if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
 			|| inode->i_uid != fattr->uid
 			|| inode->i_gid != fattr->gid)
-		nfsi->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
 
 	/* Has the link count changed? */
 	if (inode->i_nlink != fattr->nlink)
-		nfsi->flags |= NFS_INO_INVALID_ATTR;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 
 	if (!timespec_equal(&inode->i_atime, &fattr->atime))
-		nfsi->flags |= NFS_INO_INVALID_ATIME;
+		nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
 
 	nfsi->read_cache_jiffies = fattr->timestamp;
 	return 0;
@@ -1384,7 +1386,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsign
 				|| S_ISLNK(inode->i_mode)))
 		invalid &= ~NFS_INO_INVALID_DATA;
 	if (!nfs_have_delegation(inode, FMODE_READ))
-		nfsi->flags |= invalid;
+		nfsi->cache_validity |= invalid;
 
 	return 0;
  out_changed:
@@ -1961,7 +1963,8 @@ static struct inode *nfs_alloc_inode(struct super_block *sb)
 	nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
 	if (!nfsi)
 		return NULL;
-	nfsi->flags = 0;
+	nfsi->flags = 0UL;
+	nfsi->cache_validity = 0UL;
 #ifdef CONFIG_NFS_V3_ACL
 	nfsi->acl_access = ERR_PTR(-EAGAIN);
 	nfsi->acl_default = ERR_PTR(-EAGAIN);

fs/nfs/nfs3acl.c

@@ -308,7 +308,7 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
 	nfs_begin_data_update(inode);
 	status = rpc_call(server->client_acl, ACLPROC3_SETACL,
 			  &args, &fattr, 0);
-	NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS;
+	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS;
 	nfs_end_data_update(inode);
 	dprintk("NFS reply setacl: %d\n", status);
 

fs/nfs/read.c

@@ -140,7 +140,7 @@ static int nfs_readpage_sync(struct nfs_open_context *ctx, struct inode *inode,
 		if (rdata->res.eof != 0 || result == 0)
 			break;
 	} while (count);
-	NFS_FLAGS(inode) |= NFS_INO_INVALID_ATIME;
+	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
 
 	if (count)
 		memclear_highpage_flush(page, rdata->args.pgbase, count);
@@ -473,7 +473,7 @@ void nfs_readpage_result(struct rpc_task *task)
 		}
 		task->tk_status = -EIO;
 	}
-	NFS_FLAGS(data->inode) |= NFS_INO_INVALID_ATIME;
+	NFS_I(data->inode)->cache_validity |= NFS_INO_INVALID_ATIME;
 	data->complete(data, status);
 }
 

include/linux/nfs_fs.h

@@ -113,6 +113,7 @@ struct nfs_inode {
 	 * Various flags
 	 */
 	unsigned int		flags;
+	unsigned long		cache_validity;
 
 	/*
 	 * read_cache_jiffies is when we started read-caching this inode,
@@ -188,17 +189,21 @@ struct nfs_inode {
 };
 
 /*
- * Legal inode flag values
+ * Cache validity bit flags
  */
-#define NFS_INO_STALE		0x0001		/* possible stale inode */
+#define NFS_INO_INVALID_ATTR	0x0001		/* cached attrs are invalid */
+#define NFS_INO_INVALID_DATA	0x0002		/* cached data is invalid */
+#define NFS_INO_INVALID_ATIME	0x0004		/* cached atime is invalid */
+#define NFS_INO_INVALID_ACCESS	0x0008		/* cached access cred invalid */
+#define NFS_INO_INVALID_ACL	0x0010		/* cached acls are invalid */
+#define NFS_INO_REVAL_PAGECACHE	0x0020		/* must revalidate pagecache */
+
+/*
+ * Legal values of flags field
+ */
+#define NFS_INO_REVALIDATING	0x0001		/* revalidating attrs */
 #define NFS_INO_ADVISE_RDPLUS	0x0002		/* advise readdirplus */
-#define NFS_INO_REVALIDATING	0x0004		/* revalidating attrs */
-#define NFS_INO_INVALID_ATTR	0x0008		/* cached attrs are invalid */
-#define NFS_INO_INVALID_DATA	0x0010		/* cached data is invalid */
-#define NFS_INO_INVALID_ATIME	0x0020		/* cached atime is invalid */
-#define NFS_INO_INVALID_ACCESS	0x0040		/* cached access cred invalid */
-#define NFS_INO_INVALID_ACL	0x0080		/* cached acls are invalid */
-#define NFS_INO_REVAL_PAGECACHE	0x1000		/* must revalidate pagecache */
+#define NFS_INO_STALE		0x0004		/* possible stale inode */
 
 static inline struct nfs_inode *NFS_I(struct inode *inode)
 {
@@ -237,7 +242,7 @@ static inline int nfs_caches_unstable(struct inode *inode)
 static inline void NFS_CACHEINV(struct inode *inode)
 {
 	if (!nfs_caches_unstable(inode))
-		NFS_FLAGS(inode) |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
+		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
 }
 
 static inline int nfs_server_capable(struct inode *inode, int cap)