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sysfs: separate out sysfs_attach_dentry()

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Consolidate sd <-> dentry association into sysfs_attach_dentry() and
call it after dentry and inode are properly set up.  This is in
preparation of sysfs_drop_dentry() updates.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo 2007-06-14 03:45:16 +09:00 committed by Greg Kroah-Hartman
parent 73107cb3ad
commit 198a2a8470
3 changed files with 30 additions and 36 deletions
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59
fs/sysfs/dir.c
View File

@ -142,14 +142,24 @@ struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
return NULL;
}
static void sysfs_attach_dentry(struct sysfs_dirent *sd, struct dentry *dentry)
{
dentry->d_op = &sysfs_dentry_ops;
dentry->d_fsdata = sysfs_get(sd);
/* protect sd->s_dentry against sysfs_d_iput */
spin_lock(&sysfs_lock);
sd->s_dentry = dentry;
spin_unlock(&sysfs_lock);
d_rehash(dentry);
}
void sysfs_attach_dirent(struct sysfs_dirent *sd,
struct sysfs_dirent *parent_sd, struct dentry *dentry)
{
if (dentry) {
sd->s_dentry = dentry;
dentry->d_fsdata = sysfs_get(sd);
dentry->d_op = &sysfs_dentry_ops;
}
if (dentry)
sysfs_attach_dentry(sd, dentry);
if (parent_sd) {
sd->s_parent = sysfs_get(parent_sd);
@ -229,15 +239,13 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
if (!sd)
goto out_drop;
sd->s_elem.dir.kobj = kobj;
sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
error = sysfs_create(dentry, mode, init_dir);
error = sysfs_create(sd, dentry, mode, init_dir);
if (error)
goto out_sput;
inc_nlink(parent->d_inode);
dentry->d_op = &sysfs_dentry_ops;
d_rehash(dentry);
sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
*p_dentry = dentry;
error = 0;
@ -308,42 +316,28 @@ static int sysfs_attach_attr(struct sysfs_dirent * sd, struct dentry * dentry)
init = init_file;
}
dentry->d_fsdata = sysfs_get(sd);
/* protect sd->s_dentry against sysfs_d_iput */
spin_lock(&sysfs_lock);
sd->s_dentry = dentry;
spin_unlock(&sysfs_lock);
error = sysfs_create(dentry, (attr->mode & S_IALLUGO) | S_IFREG, init);
if (error) {
sysfs_put(sd);
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;
}
dentry->d_op = &sysfs_dentry_ops;
d_rehash(dentry);
sysfs_attach_dentry(sd, dentry);
return 0;
}
static int sysfs_attach_link(struct sysfs_dirent * sd, struct dentry * dentry)
{
int err = 0;
int err;
dentry->d_fsdata = sysfs_get(sd);
/* protect sd->s_dentry against sysfs_d_iput */
spin_lock(&sysfs_lock);
sd->s_dentry = dentry;
spin_unlock(&sysfs_lock);
err = sysfs_create(dentry, S_IFLNK|S_IRWXUGO, init_symlink);
if (!err) {
dentry->d_op = &sysfs_dentry_ops;
d_rehash(dentry);
} else
sysfs_put(sd);
err = sysfs_create(sd, dentry, S_IFLNK|S_IRWXUGO, init_symlink);
if (!err)
sysfs_attach_dentry(sd, dentry);
return err;
}
@ -773,7 +767,6 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
d_instantiate(shadow, igrab(inode));
inc_nlink(inode);
inc_nlink(parent->d_inode);
shadow->d_op = &sysfs_dentry_ops;
dget(shadow); /* Extra count - pin the dentry in core */

4
fs/sysfs/inode.c
View File

@ -156,13 +156,13 @@ struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent * sd)
return inode;
}
int sysfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
int sysfs_create(struct sysfs_dirent *sd, struct dentry *dentry, int mode,
int (*init)(struct inode *))
{
int error = 0;
struct inode * inode = NULL;
if (dentry) {
if (!dentry->d_inode) {
struct sysfs_dirent * sd = dentry->d_fsdata;
if ((inode = sysfs_new_inode(mode, sd))) {
if (dentry->d_parent && dentry->d_parent->d_inode) {
struct inode *p_inode = dentry->d_parent->d_inode;

3
fs/sysfs/sysfs.h
View File

@ -58,7 +58,8 @@ extern struct kmem_cache *sysfs_dir_cachep;
extern void sysfs_delete_inode(struct inode *inode);
extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
extern int sysfs_create(struct sysfs_dirent *sd, struct dentry *dentry,
int mode, int (*init)(struct inode *));
extern void release_sysfs_dirent(struct sysfs_dirent * sd);
extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);