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fs: dcache reduce branches in lookup path

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Reduce some branches and memory accesses in dcache lookup by adding dentry
flags to indicate common d_ops are set, rather than having to check them.
This saves a pointer memory access (dentry->d_op) in common path lookup
situations, and saves another pointer load and branch in cases where we
have d_op but not the particular operation.

Patched with:

git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:55 +11:00
parent 5f57cbcc02
commit fb045adb99
63 changed files with 174 additions and 137 deletions
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8
fs/configfs/dir.c
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@@ -442,7 +442,7 @@ static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * den
return error;
}
dentry->d_op = &configfs_dentry_ops;
d_set_d_op(dentry, &configfs_dentry_ops);
d_rehash(dentry);
return 0;
@@ -489,7 +489,7 @@ static struct dentry * configfs_lookup(struct inode *dir,
*/
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
dentry->d_op = &configfs_dentry_ops;
d_set_d_op(dentry, &configfs_dentry_ops);
d_add(dentry, NULL);
return NULL;
}
@@ -683,7 +683,7 @@ static int create_default_group(struct config_group *parent_group,
ret = -ENOMEM;
child = d_alloc(parent, &name);
if (child) {
child->d_op = &configfs_dentry_ops;
d_set_d_op(child, &configfs_dentry_ops);
d_add(child, NULL);
ret = configfs_attach_group(&parent_group->cg_item,
@@ -1681,7 +1681,7 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
err = -ENOMEM;
dentry = d_alloc(configfs_sb->s_root, &name);
if (dentry) {
dentry->d_op = &configfs_dentry_ops;
d_set_d_op(dentry, &configfs_dentry_ops);
d_add(dentry, NULL);
err = configfs_attach_group(sd->s_element, &group->cg_item,