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Subject[PATCH 23/25] Unionfs: add un/likely conditionals on unlink ops
Date
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---
fs/unionfs/unlink.c | 32 ++++++++++++++++----------------
1 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/fs/unionfs/unlink.c b/fs/unionfs/unlink.c
index 3924f7f..33d08d9 100644
--- a/fs/unionfs/unlink.c
+++ b/fs/unionfs/unlink.c
@@ -26,13 +26,13 @@ static int unionfs_unlink_whiteout(struct inode *dir, struct dentry *dentry)
int bindex;
int err = 0;

- if ((err = unionfs_partial_lookup(dentry)))
+ if (unlikely((err = unionfs_partial_lookup(dentry))))
goto out;

bindex = dbstart(dentry);

lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
- if (!lower_dentry)
+ if (unlikely(!lower_dentry))
goto out;

lower_dir_dentry = lock_parent(lower_dentry);
@@ -42,13 +42,13 @@ static int unionfs_unlink_whiteout(struct inode *dir, struct dentry *dentry)
if (!(err = is_robranch_super(dentry->d_sb, bindex)))
err = vfs_unlink(lower_dir_dentry->d_inode, lower_dentry);
/* if vfs_unlink succeeded, update our inode's times */
- if (!err)
+ if (likely(!err))
unionfs_copy_attr_times(dentry->d_inode);
dput(lower_dentry);
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
unlock_dir(lower_dir_dentry);

- if (err && !IS_COPYUP_ERR(err))
+ if (unlikely(err && !IS_COPYUP_ERR(err)))
goto out;

if (err) {
@@ -62,11 +62,11 @@ static int unionfs_unlink_whiteout(struct inode *dir, struct dentry *dentry)
err = create_whiteout(dentry, dbstart(dentry));

out:
- if (!err)
+ if (likely(!err))
dentry->d_inode->i_nlink--;

/* We don't want to leave negative leftover dentries for revalidate. */
- if (!err && (dbopaque(dentry) != -1))
+ if (likely(!err && (dbopaque(dentry) != -1)))
update_bstart(dentry);

return err;
@@ -79,7 +79,7 @@ int unionfs_unlink(struct inode *dir, struct dentry *dentry)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -87,7 +87,7 @@ int unionfs_unlink(struct inode *dir, struct dentry *dentry)

err = unionfs_unlink_whiteout(dir, dentry);
/* call d_drop so the system "forgets" about us */
- if (!err) {
+ if (likely(!err)) {
if (!S_ISDIR(dentry->d_inode->i_mode))
unionfs_postcopyup_release(dentry);
d_drop(dentry);
@@ -99,7 +99,7 @@ int unionfs_unlink(struct inode *dir, struct dentry *dentry)
}

out:
- if (!err) {
+ if (likely(!err)) {
unionfs_check_dentry(dentry);
unionfs_check_inode(dir);
}
@@ -117,7 +117,7 @@ static int unionfs_rmdir_first(struct inode *dir, struct dentry *dentry,

/* Here we need to remove whiteout entries. */
err = delete_whiteouts(dentry, dbstart(dentry), namelist);
- if (err)
+ if (unlikely(err))
goto out;

lower_dentry = unionfs_lower_dentry(dentry);
@@ -135,7 +135,7 @@ static int unionfs_rmdir_first(struct inode *dir, struct dentry *dentry,
dentry->d_inode->i_nlink = unionfs_get_nlinks(dentry->d_inode);

out:
- if (lower_dir_dentry)
+ if (likely(lower_dir_dentry))
unlock_dir(lower_dir_dentry);
return err;
}
@@ -148,7 +148,7 @@ int unionfs_rmdir(struct inode *dir, struct dentry *dentry)
unionfs_read_lock(dentry->d_sb);
unionfs_lock_dentry(dentry);

- if (!__unionfs_d_revalidate_chain(dentry, NULL, false)) {
+ if (unlikely(!__unionfs_d_revalidate_chain(dentry, NULL, false))) {
err = -ESTALE;
goto out;
}
@@ -156,7 +156,7 @@ int unionfs_rmdir(struct inode *dir, struct dentry *dentry)

/* check if this unionfs directory is empty or not */
err = check_empty(dentry, &namelist);
- if (err)
+ if (unlikely(err))
goto out;

err = unionfs_rmdir_first(dir, dentry, namelist);
@@ -170,7 +170,7 @@ int unionfs_rmdir(struct inode *dir, struct dentry *dentry)
goto out;

/* exit if the error returned was NOT -EROFS */
- if (!IS_COPYUP_ERR(err))
+ if (unlikely(!IS_COPYUP_ERR(err)))
goto out;

new_err = create_whiteout(dentry, dbstart(dentry) - 1);
@@ -180,10 +180,10 @@ int unionfs_rmdir(struct inode *dir, struct dentry *dentry)

out:
/* call d_drop so the system "forgets" about us */
- if (!err)
+ if (likely(!err))
d_drop(dentry);

- if (namelist)
+ if (likely(namelist))
free_rdstate(namelist);

unionfs_unlock_dentry(dentry);
--
1.5.2.2
-
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