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configfs: Allow ->make_item() and ->make_group() to return detailed errors.

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The configfs operations ->make_item() and ->make_group() currently
return a new item/group.  A return of NULL signifies an error.  Because
of this, -ENOMEM is the only return code bubbled up the stack.

Multiple folks have requested the ability to return specific error codes
when these operations fail.  This patch adds that ability by changing the
->make_item/group() ops to return ERR_PTR() values.  These errors are
bubbled up appropriately.  NULL returns are changed to -ENOMEM for
compatibility.

Also updated are the in-kernel users of configfs.

This is a rework of reverted commit 11c3b79218.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Joel Becker
2008-07-17 15:21:29 -07:00
parent f89ab8619e
commit a6795e9ebb
7 changed files with 31 additions and 37 deletions
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25
fs/configfs/dir.c
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@@ -1027,9 +1027,10 @@ EXPORT_SYMBOL(configfs_undepend_item);
static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
int ret, module_got = 0;
struct config_group *group;
struct config_item *item;
int ret = 0;
int module_got = 0;
struct config_group *group = NULL;
struct config_item *item = NULL;
struct config_item *parent_item;
struct configfs_subsystem *subsys;
struct configfs_dirent *sd;
@@ -1070,28 +1071,32 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name);
mutex_lock(&subsys->su_mutex);
group = NULL;
item = NULL;
if (type->ct_group_ops->make_group) {
group = type->ct_group_ops->make_group(to_config_group(parent_item), name);
if (group) {
if (!group)
group = ERR_PTR(-ENOMEM);
if (!IS_ERR(group)) {
link_group(to_config_group(parent_item), group);
item = &group->cg_item;
}
} else
ret = PTR_ERR(group);
} else {
item = type->ct_group_ops->make_item(to_config_group(parent_item), name);
if (item)
if (!item)
item = ERR_PTR(-ENOMEM);
if (!IS_ERR(item))
link_obj(parent_item, item);
else
ret = PTR_ERR(item);
}
mutex_unlock(&subsys->su_mutex);
kfree(name);
if (!item) {
if (ret) {
/*
* If item == NULL, then link_obj() was never called.
* There are no extra references to clean up.
*/
ret = -ENOMEM;
goto out_put;
}