[PATCH 13/25] Unionfs: add un/likely conditionals on dir ops

[Erez Zadok <ezk@cs.sunysb.edu>]

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---
 fs/unionfs/dirfops.c   |   22 +++++++++++-----------
 fs/unionfs/dirhelper.c |   30 +++++++++++++++---------------
 2 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/fs/unionfs/dirfops.c b/fs/unionfs/dirfops.c
index c923e58..fa2df88 100644
--- a/fs/unionfs/dirfops.c
+++ b/fs/unionfs/dirfops.c
@@ -63,7 +63,7 @@ static int unionfs_filldir(void *dirent, const char *name, int namelen,
 		off_t pos = rdstate2offset(buf->rdstate);
 		u64 unionfs_ino = ino;
 
-		if (!err) {
+		if (likely(!err)) {
 			err = buf->filldir(buf->dirent, name, namelen, pos,
 					   unionfs_ino, d_type);
 			buf->rdstate->offset++;
@@ -74,7 +74,7 @@ static int unionfs_filldir(void *dirent, const char *name, int namelen,
 	 * If we did fill it, stuff it in our hash, otherwise return an
 	 * error.
 	 */
-	if (err) {
+	if (unlikely(err)) {
 		buf->filldir_error = err;
 		goto out;
 	}
@@ -99,7 +99,7 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 
 	unionfs_read_lock(file->f_path.dentry->d_sb);
 
-	if ((err = unionfs_file_revalidate(file, false)))
+	if (unlikely((err = unionfs_file_revalidate(file, false))))
 		goto out;
 
 	inode = file->f_path.dentry->d_inode;
@@ -110,7 +110,7 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 			goto out;
 		} else if (file->f_pos > 0) {
 			uds = find_rdstate(inode, file->f_pos);
-			if (!uds) {
+			if (unlikely(!uds)) {
 				err = -ESTALE;
 				goto out;
 			}
@@ -124,7 +124,7 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 
 	while (uds->bindex <= bend) {
 		lower_file = unionfs_lower_file_idx(file, uds->bindex);
-		if (!lower_file) {
+		if (unlikely(!lower_file)) {
 			uds->bindex++;
 			uds->dirpos = 0;
 			continue;
@@ -141,7 +141,7 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 
 		/* Read starting from where we last left off. */
 		offset = vfs_llseek(lower_file, uds->dirpos, SEEK_SET);
-		if (offset < 0) {
+		if (unlikely(offset < 0)) {
 			err = offset;
 			goto out;
 		}
@@ -149,7 +149,7 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 
 		/* Save the position for when we continue. */
 		offset = vfs_llseek(lower_file, 0, SEEK_CUR);
-		if (offset < 0) {
+		if (unlikely(offset < 0)) {
 			err = offset;
 			goto out;
 		}
@@ -158,10 +158,10 @@ static int unionfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 		/* Copy the atime. */
 		fsstack_copy_attr_atime(inode, lower_file->f_path.dentry->d_inode);
 
-		if (err < 0)
+		if (unlikely(err < 0))
 			goto out;
 
-		if (buf.filldir_error)
+		if (unlikely(buf.filldir_error))
 			break;
 
 		if (!buf.entries_written) {
@@ -201,7 +201,7 @@ static loff_t unionfs_dir_llseek(struct file *file, loff_t offset, int origin)
 
 	unionfs_read_lock(file->f_path.dentry->d_sb);
 
-	if ((err = unionfs_file_revalidate(file, false)))
+	if (unlikely((err = unionfs_file_revalidate(file, false))))
 		goto out;
 
 	rdstate = UNIONFS_F(file)->rdstate;
@@ -241,7 +241,7 @@ static loff_t unionfs_dir_llseek(struct file *file, loff_t offset, int origin)
 			} else {
 				rdstate = find_rdstate(file->f_path.dentry->d_inode,
 						       offset);
-				if (rdstate) {
+				if (likely(rdstate)) {
 					UNIONFS_F(file)->rdstate = rdstate;
 					err = rdstate->offset;
 				} else
diff --git a/fs/unionfs/dirhelper.c b/fs/unionfs/dirhelper.c
index a72f711..d481ba4 100644
--- a/fs/unionfs/dirhelper.c
+++ b/fs/unionfs/dirhelper.c
@@ -43,7 +43,7 @@ int do_delete_whiteouts(struct dentry *dentry, int bindex,
 
 	err = -ENOMEM;
 	name = __getname();
-	if (!name)
+	if (unlikely(!name))
 		goto out;
 	strcpy(name, UNIONFS_WHPFX);
 	p = name + UNIONFS_WHLEN;
@@ -65,14 +65,14 @@ int do_delete_whiteouts(struct dentry *dentry, int bindex,
 				lookup_one_len(name, lower_dir_dentry,
 					       cursor->namelen +
 					       UNIONFS_WHLEN);
-			if (IS_ERR(lower_dentry)) {
+			if (unlikely(IS_ERR(lower_dentry))) {
 				err = PTR_ERR(lower_dentry);
 				break;
 			}
-			if (lower_dentry->d_inode)
+			if (likely(lower_dentry->d_inode))
 				err = vfs_unlink(lower_dir, lower_dentry);
 			dput(lower_dentry);
-			if (err)
+			if (unlikely(err))
 				break;
 		}
 	}
@@ -102,7 +102,7 @@ int delete_whiteouts(struct dentry *dentry, int bindex,
 	BUG_ON(bindex < dbstart(dentry));
 	BUG_ON(bindex > dbend(dentry));
 	err = is_robranch_super(sb, bindex);
-	if (err)
+	if (unlikely(err))
 		goto out;
 
 	lower_dir_dentry = unionfs_lower_dentry_idx(dentry, bindex);
@@ -160,7 +160,7 @@ static int readdir_util_callback(void *dirent, const char *name, int namelen,
 
 	found = find_filldir_node(buf->rdstate, name, namelen);
 	/* If it was found in the table there was a previous whiteout. */
-	if (found)
+	if (likely(found))
 		goto out;
 
 	/*
@@ -168,7 +168,7 @@ static int readdir_util_callback(void *dirent, const char *name, int namelen,
 	 * empty.
 	 */
 	err = -ENOTEMPTY;
-	if ((buf->mode == RD_CHECK_EMPTY) && !whiteout)
+	if (unlikely((buf->mode == RD_CHECK_EMPTY) && !whiteout))
 		goto out;
 
 	err = add_filldir_node(buf->rdstate, name, namelen,
@@ -194,7 +194,7 @@ int check_empty(struct dentry *dentry, struct unionfs_dir_state **namelist)
 
 	BUG_ON(!S_ISDIR(dentry->d_inode->i_mode));
 
-	if ((err = unionfs_partial_lookup(dentry)))
+	if (unlikely((err = unionfs_partial_lookup(dentry))))
 		goto out;
 
 	bstart = dbstart(dentry);
@@ -204,14 +204,14 @@ int check_empty(struct dentry *dentry, struct unionfs_dir_state **namelist)
 		bend = bopaque;
 
 	buf = kmalloc(sizeof(struct unionfs_rdutil_callback), GFP_KERNEL);
-	if (!buf) {
+	if (unlikely(!buf)) {
 		err = -ENOMEM;
 		goto out;
 	}
 	buf->err = 0;
 	buf->mode = RD_CHECK_EMPTY;
 	buf->rdstate = alloc_rdstate(dentry->d_inode, bstart);
-	if (!buf->rdstate) {
+	if (unlikely(!buf->rdstate)) {
 		err = -ENOMEM;
 		goto out;
 	}
@@ -233,7 +233,7 @@ int check_empty(struct dentry *dentry, struct unionfs_dir_state **namelist)
 			dentry_open(lower_dentry,
 				    unionfs_lower_mnt_idx(dentry, bindex),
 				    O_RDONLY);
-		if (IS_ERR(lower_file)) {
+		if (unlikely(IS_ERR(lower_file))) {
 			err = PTR_ERR(lower_file);
 			dput(lower_dentry);
 			branchput(sb, bindex);
@@ -245,7 +245,7 @@ int check_empty(struct dentry *dentry, struct unionfs_dir_state **namelist)
 			buf->rdstate->bindex = bindex;
 			err = vfs_readdir(lower_file,
 					  readdir_util_callback, buf);
-			if (buf->err)
+			if (unlikely(buf->err))
 				err = buf->err;
 		} while ((err >= 0) && buf->filldir_called);
 
@@ -253,15 +253,15 @@ int check_empty(struct dentry *dentry, struct unionfs_dir_state **namelist)
 		fput(lower_file);
 		branchput(sb, bindex);
 
-		if (err < 0)
+		if (unlikely(err < 0))
 			goto out;
 	}
 
 out:
-	if (buf) {
+	if (likely(buf)) {
 		if (namelist && !err)
 			*namelist = buf->rdstate;
-		else if (buf->rdstate)
+		else if (likely(buf->rdstate))
 			free_rdstate(buf->rdstate);
 		kfree(buf);
 	}
-- 
1.5.2.2

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