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sysfs: move sysfs_drop_dentry() to dir.c and make it static

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After add/remove path restructuring, the only user of
sysfs_drop_dentry() is sysfs_addrm_finish().  Move sysfs_drop_dentry()
to dir.c and make it static.

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 04:27:24 +09:00 • committed by Greg Kroah-Hartman
parent fb6896da37
commit a0edd7c848
3 changed files with 56 additions and 57 deletions
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56
fs/sysfs/dir.c
View file

@ -434,6 +434,62 @@ void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
acxt->cnt++; acxt->cnt++;
} }
/**
* sysfs_drop_dentry - drop dentry for the specified sysfs_dirent
* @sd: target sysfs_dirent
*
* Drop dentry for @sd. @sd must have been unlinked from its
* parent on entry to this function such that it can't be looked
* up anymore.
*
* @sd->s_dentry which is protected with sysfs_assoc_lock points
* to the currently associated dentry but we're not holding a
* reference to it and racing with dput(). Grab dcache_lock and
* verify dentry before dropping it. If @sd->s_dentry is NULL or
* dput() beats us, no need to bother.
*/
static void sysfs_drop_dentry(struct sysfs_dirent *sd)
{
struct dentry *dentry = NULL;
struct inode *inode;
/* We're not holding a reference to ->s_dentry dentry but the
* field will stay valid as long as sysfs_assoc_lock is held.
*/
spin_lock(&sysfs_assoc_lock);
spin_lock(&dcache_lock);
/* drop dentry if it's there and dput() didn't kill it yet */
if (sd->s_dentry && sd->s_dentry->d_inode) {
dentry = dget_locked(sd->s_dentry);
spin_lock(&dentry->d_lock);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
}
spin_unlock(&dcache_lock);
spin_unlock(&sysfs_assoc_lock);
dput(dentry);
/* XXX: unpin if directory, this will go away soon */
if (sysfs_type(sd) == SYSFS_DIR)
dput(dentry);
/* adjust nlink and update timestamp */
inode = ilookup(sysfs_sb, sd->s_ino);
if (inode) {
mutex_lock(&inode->i_mutex);
inode->i_ctime = CURRENT_TIME;
drop_nlink(inode);
if (sysfs_type(sd) == SYSFS_DIR)
drop_nlink(inode);
mutex_unlock(&inode->i_mutex);
iput(inode);
}
}
/** /**
* sysfs_addrm_finish - finish up sysfs_dirent add/remove * sysfs_addrm_finish - finish up sysfs_dirent add/remove
* @acxt: addrm context to finish up * @acxt: addrm context to finish up

56
fs/sysfs/inode.c
View file

@ -197,62 +197,6 @@ void sysfs_instantiate(struct dentry *dentry, struct inode *inode)
d_instantiate(dentry, inode); d_instantiate(dentry, inode);
} }
/**
* sysfs_drop_dentry - drop dentry for the specified sysfs_dirent
* @sd: target sysfs_dirent
*
* Drop dentry for @sd. @sd must have been unlinked from its
* parent on entry to this function such that it can't be looked
* up anymore.
*
* @sd->s_dentry which is protected with sysfs_assoc_lock points
* to the currently associated dentry but we're not holding a
* reference to it and racing with dput(). Grab dcache_lock and
* verify dentry before dropping it. If @sd->s_dentry is NULL or
* dput() beats us, no need to bother.
*/
void sysfs_drop_dentry(struct sysfs_dirent *sd)
{
struct dentry *dentry = NULL;
struct inode *inode;
/* We're not holding a reference to ->s_dentry dentry but the
* field will stay valid as long as sysfs_assoc_lock is held.
*/
spin_lock(&sysfs_assoc_lock);
spin_lock(&dcache_lock);
/* drop dentry if it's there and dput() didn't kill it yet */
if (sd->s_dentry && sd->s_dentry->d_inode) {
dentry = dget_locked(sd->s_dentry);
spin_lock(&dentry->d_lock);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
}
spin_unlock(&dcache_lock);
spin_unlock(&sysfs_assoc_lock);
dput(dentry);
/* XXX: unpin if directory, this will go away soon */
if (sysfs_type(sd) == SYSFS_DIR)
dput(dentry);
/* adjust nlink and update timestamp */
inode = ilookup(sysfs_sb, sd->s_ino);
if (inode) {
mutex_lock(&inode->i_mutex);
inode->i_ctime = CURRENT_TIME;
drop_nlink(inode);
if (sysfs_type(sd) == SYSFS_DIR)
drop_nlink(inode);
mutex_unlock(&inode->i_mutex);
iput(inode);
}
}
int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name) int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
{ {
struct sysfs_addrm_cxt acxt; struct sysfs_addrm_cxt acxt;

1
fs/sysfs/sysfs.h
View file

@ -90,7 +90,6 @@ extern int sysfs_create_subdir(struct kobject *kobj, const char *name,
struct sysfs_dirent **p_sd); struct sysfs_dirent **p_sd);
extern void sysfs_remove_subdir(struct sysfs_dirent *sd); extern void sysfs_remove_subdir(struct sysfs_dirent *sd);
extern void sysfs_drop_dentry(struct sysfs_dirent *sd);
extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
extern spinlock_t sysfs_assoc_lock; extern spinlock_t sysfs_assoc_lock;