sysfs: reorganize sysfs_new_indoe() and sysfs_create()
Reorganize/clean up sysfs_new_inode() and sysfs_create().
* sysfs_init_inode() is separated out from sysfs_new_inode() and is
responsible for basic initialization.
* sysfs_instantiate() replaces the last step of sysfs_create() and is
responsible for dentry instantitaion.
* type-specific initialization is moved out to the callers.
* mode is specified only once when creating a sysfs_dirent.
* spurious list_del_init(&sd->s_sibling) dropped from create_dir()
This change is to
* prepare for inode allocation fix.
* separate alloc and init code for synchronization update.
* make dentry/inode initialization more flexible for later changes.
This patch doesn't introduce visible behavior change.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index a26e3db..bbf3525 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -191,39 +191,18 @@
return 0;
}
-static int init_dir(struct inode * inode)
-{
- inode->i_op = &sysfs_dir_inode_operations;
- inode->i_fop = &sysfs_dir_operations;
-
- /* directory inodes start off with i_nlink == 2 (for "." entry) */
- inc_nlink(inode);
- return 0;
-}
-
-static int init_file(struct inode * inode)
-{
- inode->i_size = PAGE_SIZE;
- inode->i_fop = &sysfs_file_operations;
- return 0;
-}
-
-static int init_symlink(struct inode * inode)
-{
- inode->i_op = &sysfs_symlink_inode_operations;
- return 0;
-}
-
static int create_dir(struct kobject *kobj, struct dentry *parent,
const char *name, struct dentry **p_dentry)
{
int error;
umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
struct dentry *dentry;
+ struct inode *inode;
struct sysfs_dirent *sd;
mutex_lock(&parent->d_inode->i_mutex);
+ /* allocate */
dentry = lookup_one_len(name, parent, strlen(name));
if (IS_ERR(dentry)) {
error = PTR_ERR(dentry);
@@ -231,7 +210,7 @@
}
error = -EEXIST;
- if (sysfs_dirent_exist(parent->d_fsdata, name))
+ if (dentry->d_inode)
goto out_dput;
error = -ENOMEM;
@@ -240,19 +219,31 @@
goto out_drop;
sd->s_elem.dir.kobj = kobj;
- error = sysfs_create(sd, dentry, mode, init_dir);
- if (error)
+ inode = sysfs_new_inode(sd);
+ if (!inode)
goto out_sput;
+ inode->i_op = &sysfs_dir_inode_operations;
+ inode->i_fop = &sysfs_dir_operations;
+ /* directory inodes start off with i_nlink == 2 (for "." entry) */
+ inc_nlink(inode);
+
+ /* link in */
+ error = -EEXIST;
+ if (sysfs_dirent_exist(parent->d_fsdata, name))
+ goto out_iput;
+
+ sysfs_instantiate(dentry, inode);
inc_nlink(parent->d_inode);
sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
*p_dentry = dentry;
error = 0;
- goto out_dput;
+ goto out_unlock; /* pin directory dentry in core */
+ out_iput:
+ iput(inode);
out_sput:
- list_del_init(&sd->s_sibling);
sysfs_put(sd);
out_drop:
d_drop(dentry);
@@ -298,71 +289,46 @@
return error;
}
-/* attaches attribute's sysfs_dirent to the dentry corresponding to the
- * attribute file
- */
-static int sysfs_attach_attr(struct sysfs_dirent * sd, struct dentry * dentry)
-{
- struct attribute * attr = NULL;
- struct bin_attribute * bin_attr = NULL;
- int (* init) (struct inode *) = NULL;
- int error = 0;
-
- if (sd->s_type & SYSFS_KOBJ_BIN_ATTR) {
- bin_attr = sd->s_elem.bin_attr.bin_attr;
- attr = &bin_attr->attr;
- } else {
- attr = sd->s_elem.attr.attr;
- init = init_file;
- }
-
- error = sysfs_create(sd, dentry,
- (attr->mode & S_IALLUGO) | S_IFREG, init);
- if (error)
- return error;
-
- if (bin_attr) {
- dentry->d_inode->i_size = bin_attr->size;
- dentry->d_inode->i_fop = &bin_fops;
- }
-
- sysfs_attach_dentry(sd, dentry);
-
- return 0;
-}
-
-static int sysfs_attach_link(struct sysfs_dirent * sd, struct dentry * dentry)
-{
- int err;
-
- err = sysfs_create(sd, dentry, S_IFLNK|S_IRWXUGO, init_symlink);
- if (!err)
- sysfs_attach_dentry(sd, dentry);
-
- return err;
-}
-
static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct sysfs_dirent * parent_sd = dentry->d_parent->d_fsdata;
struct sysfs_dirent * sd;
- int err = 0;
+ struct inode *inode;
+ int found = 0;
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
- if (sd->s_type & SYSFS_NOT_PINNED) {
- if (strcmp(sd->s_name, dentry->d_name.name))
- continue;
-
- if (sd->s_type & SYSFS_KOBJ_LINK)
- err = sysfs_attach_link(sd, dentry);
- else
- err = sysfs_attach_attr(sd, dentry);
+ if ((sd->s_type & SYSFS_NOT_PINNED) &&
+ !strcmp(sd->s_name, dentry->d_name.name)) {
+ found = 1;
break;
}
}
- return ERR_PTR(err);
+ /* no such entry */
+ if (!found)
+ return NULL;
+
+ /* attach dentry and inode */
+ inode = sysfs_new_inode(sd);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ /* initialize inode according to type */
+ if (sd->s_type & SYSFS_KOBJ_ATTR) {
+ inode->i_size = PAGE_SIZE;
+ inode->i_fop = &sysfs_file_operations;
+ } else if (sd->s_type & SYSFS_KOBJ_BIN_ATTR) {
+ struct bin_attribute *bin_attr = sd->s_elem.bin_attr.bin_attr;
+ inode->i_size = bin_attr->size;
+ inode->i_fop = &bin_fops;
+ } else if (sd->s_type & SYSFS_KOBJ_LINK)
+ inode->i_op = &sysfs_symlink_inode_operations;
+
+ sysfs_instantiate(dentry, inode);
+ sysfs_attach_dentry(sd, dentry);
+
+ return NULL;
}
const struct inode_operations sysfs_dir_inode_operations = {