#include <asm/semaphore.h>
#include "sysfs.h"
-DECLARE_RWSEM(sysfs_rename_sem);
-spinlock_t sysfs_lock = SPIN_LOCK_UNLOCKED;
-spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
+DEFINE_MUTEX(sysfs_mutex);
+spinlock_t sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
static DEFINE_IDA(sysfs_ino_ida);
* sd->s_parent->s_children.
*
* Locking:
- * mutex_lock(sd->s_parent->dentry->d_inode->i_mutex)
+ * mutex_lock(sysfs_mutex)
*/
-static void sysfs_link_sibling(struct sysfs_dirent *sd)
+void sysfs_link_sibling(struct sysfs_dirent *sd)
{
struct sysfs_dirent *parent_sd = sd->s_parent;
* sd->s_parent->s_children.
*
* Locking:
- * mutex_lock(sd->s_parent->dentry->d_inode->i_mutex)
+ * mutex_lock(sysfs_mutex)
*/
-static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
+void sysfs_unlink_sibling(struct sysfs_dirent *sd)
{
struct sysfs_dirent **pos;
*
* Deny new active references and drain existing ones.
*/
-void sysfs_deactivate(struct sysfs_dirent *sd)
+static void sysfs_deactivate(struct sysfs_dirent *sd)
{
DECLARE_COMPLETION_ONSTACK(wait);
int v;
struct sysfs_dirent *parent_sd;
repeat:
+ /* Moving/renaming is always done while holding reference.
+ * sd->s_parent won't change beneath us.
+ */
parent_sd = sd->s_parent;
if (sysfs_type(sd) == SYSFS_KOBJ_LINK)
struct sysfs_dirent * sd = dentry->d_fsdata;
if (sd) {
- /* sd->s_dentry is protected with sysfs_lock. This
- * allows sysfs_drop_dentry() to dereference it.
+ /* sd->s_dentry is protected with sysfs_assoc_lock.
+ * This allows sysfs_drop_dentry() to dereference it.
*/
- spin_lock(&sysfs_lock);
+ spin_lock(&sysfs_assoc_lock);
/* The dentry might have been deleted or another
* lookup could have happened updating sd->s_dentry to
*/
if (sd->s_dentry == dentry)
sd->s_dentry = NULL;
- spin_unlock(&sysfs_lock);
+ spin_unlock(&sysfs_assoc_lock);
sysfs_put(sd);
}
iput(inode);
return NULL;
}
+/**
+ * sysfs_attach_dentry - associate sysfs_dirent with dentry
+ * @sd: target sysfs_dirent
+ * @dentry: dentry to associate
+ *
+ * Associate @sd with @dentry. This is protected by
+ * sysfs_assoc_lock to avoid race with sysfs_d_iput().
+ *
+ * LOCKING:
+ * mutex_lock(sysfs_mutex)
+ */
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);
+ spin_lock(&sysfs_assoc_lock);
sd->s_dentry = dentry;
- spin_unlock(&sysfs_lock);
+ spin_unlock(&sysfs_assoc_lock);
d_rehash(dentry);
}
-void sysfs_attach_dirent(struct sysfs_dirent *sd,
- struct sysfs_dirent *parent_sd, struct dentry *dentry)
+static int sysfs_ilookup_test(struct inode *inode, void *arg)
{
- if (dentry)
- sysfs_attach_dentry(sd, dentry);
+ struct sysfs_dirent *sd = arg;
+ return inode->i_ino == sd->s_ino;
+}
- if (parent_sd) {
- sd->s_parent = sysfs_get(parent_sd);
- sysfs_link_sibling(sd);
+/**
+ * sysfs_addrm_start - prepare for sysfs_dirent add/remove
+ * @acxt: pointer to sysfs_addrm_cxt to be used
+ * @parent_sd: parent sysfs_dirent
+ *
+ * This function is called when the caller is about to add or
+ * remove sysfs_dirent under @parent_sd. This function acquires
+ * sysfs_mutex, grabs inode for @parent_sd if available and lock
+ * i_mutex of it. @acxt is used to keep and pass context to
+ * other addrm functions.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep). sysfs_mutex is locked on
+ * return. i_mutex of parent inode is locked on return if
+ * available.
+ */
+void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
+ struct sysfs_dirent *parent_sd)
+{
+ struct inode *inode;
+
+ memset(acxt, 0, sizeof(*acxt));
+ acxt->parent_sd = parent_sd;
+
+ /* Lookup parent inode. inode initialization and I_NEW
+ * clearing are protected by sysfs_mutex. By grabbing it and
+ * looking up with _nowait variant, inode state can be
+ * determined reliably.
+ */
+ mutex_lock(&sysfs_mutex);
+
+ inode = ilookup5_nowait(sysfs_sb, parent_sd->s_ino, sysfs_ilookup_test,
+ parent_sd);
+
+ if (inode && !(inode->i_state & I_NEW)) {
+ /* parent inode available */
+ acxt->parent_inode = inode;
+
+ /* sysfs_mutex is below i_mutex in lock hierarchy.
+ * First, trylock i_mutex. If fails, unlock
+ * sysfs_mutex and lock them in order.
+ */
+ if (!mutex_trylock(&inode->i_mutex)) {
+ mutex_unlock(&sysfs_mutex);
+ mutex_lock(&inode->i_mutex);
+ mutex_lock(&sysfs_mutex);
+ }
+ } else
+ iput(inode);
+}
+
+/**
+ * sysfs_add_one - add sysfs_dirent to parent
+ * @acxt: addrm context to use
+ * @sd: sysfs_dirent to be added
+ *
+ * Get @acxt->parent_sd and set sd->s_parent to it and increment
+ * nlink of parent inode if @sd is a directory. @sd is NOT
+ * linked into the children list of the parent. The caller
+ * should invoke sysfs_link_sibling() after this function
+ * completes if @sd needs to be on the children list.
+ *
+ * This function should be called between calls to
+ * sysfs_addrm_start() and sysfs_addrm_finish() and should be
+ * passed the same @acxt as passed to sysfs_addrm_start().
+ *
+ * LOCKING:
+ * Determined by sysfs_addrm_start().
+ */
+void sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
+{
+ sd->s_parent = sysfs_get(acxt->parent_sd);
+
+ if (sysfs_type(sd) == SYSFS_DIR && acxt->parent_inode)
+ inc_nlink(acxt->parent_inode);
+
+ acxt->cnt++;
+}
+
+/**
+ * sysfs_remove_one - remove sysfs_dirent from parent
+ * @acxt: addrm context to use
+ * @sd: sysfs_dirent to be added
+ *
+ * Mark @sd removed and drop nlink of parent inode if @sd is a
+ * directory. @sd is NOT unlinked from the children list of the
+ * parent. The caller is repsonsible for removing @sd from the
+ * children list before calling this function.
+ *
+ * This function should be called between calls to
+ * sysfs_addrm_start() and sysfs_addrm_finish() and should be
+ * passed the same @acxt as passed to sysfs_addrm_start().
+ *
+ * LOCKING:
+ * Determined by sysfs_addrm_start().
+ */
+void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
+{
+ BUG_ON(sd->s_sibling || (sd->s_flags & SYSFS_FLAG_REMOVED));
+
+ sd->s_flags |= SYSFS_FLAG_REMOVED;
+ sd->s_sibling = acxt->removed;
+ acxt->removed = sd;
+
+ if (sysfs_type(sd) == SYSFS_DIR && acxt->parent_inode)
+ drop_nlink(acxt->parent_inode);
+
+ 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
+ * @acxt: addrm context to finish up
+ *
+ * Finish up sysfs_dirent add/remove. Resources acquired by
+ * sysfs_addrm_start() are released and removed sysfs_dirents are
+ * cleaned up. Timestamps on the parent inode are updated.
+ *
+ * LOCKING:
+ * All mutexes acquired by sysfs_addrm_start() are released.
+ *
+ * RETURNS:
+ * Number of added/removed sysfs_dirents since sysfs_addrm_start().
+ */
+int sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
+{
+ /* release resources acquired by sysfs_addrm_start() */
+ mutex_unlock(&sysfs_mutex);
+ if (acxt->parent_inode) {
+ struct inode *inode = acxt->parent_inode;
+
+ /* if added/removed, update timestamps on the parent */
+ if (acxt->cnt)
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+
+ mutex_unlock(&inode->i_mutex);
+ iput(inode);
+ }
+
+ /* kill removed sysfs_dirents */
+ while (acxt->removed) {
+ struct sysfs_dirent *sd = acxt->removed;
+
+ acxt->removed = sd->s_sibling;
+ sd->s_sibling = NULL;
+
+ sysfs_drop_dentry(sd);
+ sysfs_deactivate(sd);
+ sysfs_put(sd);
}
+
+ return acxt->cnt;
}
/**
* Look for sysfs_dirent with name @name under @parent_sd.
*
* LOCKING:
- * mutex_lock(parent->i_mutex)
+ * mutex_lock(sysfs_mutex)
*
* RETURNS:
* Pointer to sysfs_dirent if found, NULL if not.
* it if found.
*
* LOCKING:
- * Kernel thread context (may sleep)
+ * Kernel thread context (may sleep). Grabs sysfs_mutex.
*
* RETURNS:
* Pointer to sysfs_dirent if found, NULL if not.
{
struct sysfs_dirent *sd;
- mutex_lock(&parent_sd->s_dentry->d_inode->i_mutex);
+ mutex_lock(&sysfs_mutex);
sd = sysfs_find_dirent(parent_sd, name);
sysfs_get(sd);
- mutex_unlock(&parent_sd->s_dentry->d_inode->i_mutex);
+ mutex_unlock(&sysfs_mutex);
return sd;
}
-static int create_dir(struct kobject *kobj, struct dentry *parent,
- const char *name, struct dentry **p_dentry)
+static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
+ const char *name, struct sysfs_dirent **p_sd)
{
+ struct dentry *parent = parent_sd->s_dentry;
+ struct sysfs_addrm_cxt acxt;
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);
+ sysfs_addrm_start(&acxt, parent_sd);
/* allocate */
dentry = lookup_one_len(name, parent, strlen(name));
if (IS_ERR(dentry)) {
error = PTR_ERR(dentry);
- goto out_unlock;
+ goto out_finish;
}
error = -EEXIST;
/* link in */
error = -EEXIST;
- if (sysfs_find_dirent(parent->d_fsdata, name))
+ if (sysfs_find_dirent(parent_sd, name))
goto out_iput;
+ sysfs_add_one(&acxt, sd);
+ sysfs_link_sibling(sd);
sysfs_instantiate(dentry, inode);
- inc_nlink(parent->d_inode);
- sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
+ sysfs_attach_dentry(sd, dentry);
- *p_dentry = dentry;
+ *p_sd = sd;
error = 0;
- goto out_unlock; /* pin directory dentry in core */
+ goto out_finish; /* pin directory dentry in core */
out_iput:
iput(inode);
d_drop(dentry);
out_dput:
dput(dentry);
- out_unlock:
- mutex_unlock(&parent->d_inode->i_mutex);
+ out_finish:
+ sysfs_addrm_finish(&acxt);
return error;
}
-
-int sysfs_create_subdir(struct kobject * k, const char * n, struct dentry ** d)
+int sysfs_create_subdir(struct kobject *kobj, const char *name,
+ struct sysfs_dirent **p_sd)
{
- return create_dir(k,k->dentry,n,d);
+ return create_dir(kobj, kobj->sd, name, p_sd);
}
/**
* sysfs_create_dir - create a directory for an object.
* @kobj: object we're creating directory for.
- * @shadow_parent: parent parent object.
+ * @shadow_parent: parent object.
*/
-
-int sysfs_create_dir(struct kobject * kobj, struct dentry *shadow_parent)
+int sysfs_create_dir(struct kobject *kobj,
+ struct sysfs_dirent *shadow_parent_sd)
{
- struct dentry * dentry = NULL;
- struct dentry * parent;
+ struct sysfs_dirent *parent_sd, *sd;
int error = 0;
BUG_ON(!kobj);
- if (shadow_parent)
- parent = shadow_parent;
+ if (shadow_parent_sd)
+ parent_sd = shadow_parent_sd;
else if (kobj->parent)
- parent = kobj->parent->dentry;
+ parent_sd = kobj->parent->sd;
else if (sysfs_mount && sysfs_mount->mnt_sb)
- parent = sysfs_mount->mnt_sb->s_root;
+ parent_sd = sysfs_mount->mnt_sb->s_root->d_fsdata;
else
return -EFAULT;
- error = create_dir(kobj,parent,kobject_name(kobj),&dentry);
+ error = create_dir(kobj, parent_sd, kobject_name(kobj), &sd);
if (!error)
- kobj->dentry = dentry;
+ kobj->sd = sd;
return error;
}
if (!inode)
return ERR_PTR(-ENOMEM);
+ mutex_lock(&sysfs_mutex);
+
if (inode->i_state & I_NEW) {
/* initialize inode according to type */
switch (sysfs_type(sd)) {
sysfs_instantiate(dentry, inode);
sysfs_attach_dentry(sd, dentry);
+ mutex_unlock(&sysfs_mutex);
+
return NULL;
}
.setattr = sysfs_setattr,
};
-static void remove_dir(struct dentry * d)
+static void remove_dir(struct sysfs_dirent *sd)
{
- struct dentry *parent = d->d_parent;
- struct sysfs_dirent *sd = d->d_fsdata;
-
- mutex_lock(&parent->d_inode->i_mutex);
+ struct sysfs_addrm_cxt acxt;
+ sysfs_addrm_start(&acxt, sd->s_parent);
sysfs_unlink_sibling(sd);
- sd->s_flags |= SYSFS_FLAG_REMOVED;
-
- pr_debug(" o %s removing done (%d)\n",d->d_name.name,
- atomic_read(&d->d_count));
-
- mutex_unlock(&parent->d_inode->i_mutex);
-
- sysfs_drop_dentry(sd);
- sysfs_deactivate(sd);
- sysfs_put(sd);
+ sysfs_remove_one(&acxt, sd);
+ sysfs_addrm_finish(&acxt);
}
-void sysfs_remove_subdir(struct dentry * d)
+void sysfs_remove_subdir(struct sysfs_dirent *sd)
{
- remove_dir(d);
+ remove_dir(sd);
}
-static void __sysfs_remove_dir(struct dentry *dentry)
+static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd)
{
- struct sysfs_dirent *removed = NULL;
- struct sysfs_dirent *parent_sd;
+ struct sysfs_addrm_cxt acxt;
struct sysfs_dirent **pos;
- if (!dentry)
+ if (!dir_sd)
return;
- pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
- mutex_lock(&dentry->d_inode->i_mutex);
- parent_sd = dentry->d_fsdata;
- pos = &parent_sd->s_children;
+ pr_debug("sysfs %s: removing dir\n", dir_sd->s_name);
+ sysfs_addrm_start(&acxt, dir_sd);
+ pos = &dir_sd->s_children;
while (*pos) {
struct sysfs_dirent *sd = *pos;
if (sysfs_type(sd) && (sysfs_type(sd) & SYSFS_NOT_PINNED)) {
- sd->s_flags |= SYSFS_FLAG_REMOVED;
*pos = sd->s_sibling;
- sd->s_sibling = removed;
- removed = sd;
+ sd->s_sibling = NULL;
+ sysfs_remove_one(&acxt, sd);
} else
pos = &(*pos)->s_sibling;
}
- mutex_unlock(&dentry->d_inode->i_mutex);
-
- while (removed) {
- struct sysfs_dirent *sd = removed;
-
- removed = sd->s_sibling;
- sd->s_sibling = NULL;
-
- sysfs_drop_dentry(sd);
- sysfs_deactivate(sd);
- sysfs_put(sd);
- }
+ sysfs_addrm_finish(&acxt);
- remove_dir(dentry);
+ remove_dir(dir_sd);
}
/**
void sysfs_remove_dir(struct kobject * kobj)
{
- struct dentry *d = kobj->dentry;
+ struct sysfs_dirent *sd = kobj->sd;
- spin_lock(&kobj_sysfs_assoc_lock);
- kobj->dentry = NULL;
- spin_unlock(&kobj_sysfs_assoc_lock);
+ spin_lock(&sysfs_assoc_lock);
+ kobj->sd = NULL;
+ spin_unlock(&sysfs_assoc_lock);
- __sysfs_remove_dir(d);
+ __sysfs_remove_dir(sd);
}
-int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
+int sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
const char *new_name)
{
- struct sysfs_dirent *sd = kobj->dentry->d_fsdata;
- struct sysfs_dirent *parent_sd = new_parent->d_fsdata;
+ struct sysfs_dirent *sd = kobj->sd;
+ struct dentry *new_parent = new_parent_sd->s_dentry;
struct dentry *new_dentry;
char *dup_name;
int error;
- if (!new_parent)
+ if (!new_parent_sd)
return -EFAULT;
- down_write(&sysfs_rename_sem);
mutex_lock(&new_parent->d_inode->i_mutex);
new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name));
* shadows of the same directory
*/
error = -EINVAL;
- if (kobj->dentry->d_parent->d_inode != new_parent->d_inode ||
+ if (sd->s_parent->s_dentry->d_inode != new_parent->d_inode ||
new_dentry->d_parent->d_inode != new_parent->d_inode ||
- new_dentry == kobj->dentry)
+ new_dentry == sd->s_dentry)
goto out_dput;
error = -EEXIST;
/* move under the new parent */
d_add(new_dentry, NULL);
- d_move(kobj->dentry, new_dentry);
+ d_move(sd->s_dentry, new_dentry);
+
+ mutex_lock(&sysfs_mutex);
sysfs_unlink_sibling(sd);
- sysfs_get(parent_sd);
+ sysfs_get(new_parent_sd);
sysfs_put(sd->s_parent);
- sd->s_parent = parent_sd;
+ sd->s_parent = new_parent_sd;
sysfs_link_sibling(sd);
+ mutex_unlock(&sysfs_mutex);
+
error = 0;
goto out_unlock;
dput(new_dentry);
out_unlock:
mutex_unlock(&new_parent->d_inode->i_mutex);
- up_write(&sysfs_rename_sem);
return error;
}
int error;
old_parent_dentry = kobj->parent ?
- kobj->parent->dentry : sysfs_mount->mnt_sb->s_root;
+ kobj->parent->sd->s_dentry : sysfs_mount->mnt_sb->s_root;
new_parent_dentry = new_parent ?
- new_parent->dentry : sysfs_mount->mnt_sb->s_root;
+ new_parent->sd->s_dentry : sysfs_mount->mnt_sb->s_root;
if (old_parent_dentry->d_inode == new_parent_dentry->d_inode)
return 0; /* nothing to move */
}
new_parent_sd = new_parent_dentry->d_fsdata;
- sd = kobj->dentry->d_fsdata;
+ sd = kobj->sd;
new_dentry = lookup_one_len(kobj->name, new_parent_dentry,
strlen(kobj->name));
} else
error = 0;
d_add(new_dentry, NULL);
- d_move(kobj->dentry, new_dentry);
+ d_move(sd->s_dentry, new_dentry);
dput(new_dentry);
/* Remove from old parent's list and insert into new parent's list. */
+ mutex_lock(&sysfs_mutex);
+
sysfs_unlink_sibling(sd);
sysfs_get(new_parent_sd);
sysfs_put(sd->s_parent);
sd->s_parent = new_parent_sd;
sysfs_link_sibling(sd);
+ mutex_unlock(&sysfs_mutex);
out:
mutex_unlock(&new_parent_dentry->d_inode->i_mutex);
mutex_unlock(&old_parent_dentry->d_inode->i_mutex);
struct sysfs_dirent * parent_sd = dentry->d_fsdata;
struct sysfs_dirent * sd;
- mutex_lock(&dentry->d_inode->i_mutex);
sd = sysfs_new_dirent("_DIR_", 0, 0);
- if (sd)
- sysfs_attach_dirent(sd, parent_sd, NULL);
- mutex_unlock(&dentry->d_inode->i_mutex);
+ if (sd) {
+ mutex_lock(&sysfs_mutex);
+ sd->s_parent = sysfs_get(parent_sd);
+ sysfs_link_sibling(sd);
+ mutex_unlock(&sysfs_mutex);
+ }
file->private_data = sd;
return sd ? 0 : -ENOMEM;
static int sysfs_dir_close(struct inode *inode, struct file *file)
{
- struct dentry * dentry = file->f_path.dentry;
struct sysfs_dirent * cursor = file->private_data;
- mutex_lock(&dentry->d_inode->i_mutex);
+ mutex_lock(&sysfs_mutex);
sysfs_unlink_sibling(cursor);
- mutex_unlock(&dentry->d_inode->i_mutex);
+ mutex_unlock(&sysfs_mutex);
release_sysfs_dirent(cursor);
i++;
/* fallthrough */
default:
+ mutex_lock(&sysfs_mutex);
+
pos = &parent_sd->s_children;
while (*pos != cursor)
pos = &(*pos)->s_sibling;
/* put cursor back in */
cursor->s_sibling = *pos;
*pos = cursor;
+
+ mutex_unlock(&sysfs_mutex);
}
return 0;
}
{
struct dentry * dentry = file->f_path.dentry;
- mutex_lock(&dentry->d_inode->i_mutex);
switch (origin) {
case 1:
offset += file->f_pos;
if (offset >= 0)
break;
default:
- mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
return -EINVAL;
}
if (offset != file->f_pos) {
+ mutex_lock(&sysfs_mutex);
+
file->f_pos = offset;
if (file->f_pos >= 2) {
struct sysfs_dirent *sd = dentry->d_fsdata;
cursor->s_sibling = *pos;
*pos = cursor;
}
+
+ mutex_unlock(&sysfs_mutex);
}
- mutex_unlock(&dentry->d_inode->i_mutex);
+
return offset;
}
struct inode *inode;
struct inode_operations *i_op;
- inode = kobj->dentry->d_inode;
+ inode = kobj->sd->s_dentry->d_inode;
if (inode->i_op != &sysfs_dir_inode_operations)
return -EINVAL;
* directory.
*/
-struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
+struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj)
{
- struct dentry *dir = kobj->dentry;
+ struct dentry *dir = kobj->sd->s_dentry;
struct inode *inode = dir->d_inode;
struct dentry *parent = dir->d_parent;
struct sysfs_dirent *parent_sd = parent->d_fsdata;
struct dentry *shadow;
struct sysfs_dirent *sd;
+ struct sysfs_addrm_cxt acxt;
- shadow = ERR_PTR(-EINVAL);
+ sd = ERR_PTR(-EINVAL);
if (!sysfs_is_shadowed_inode(inode))
goto out;
if (!sd)
goto nomem;
sd->s_elem.dir.kobj = kobj;
- /* point to parent_sd but don't attach to it */
- sd->s_parent = sysfs_get(parent_sd);
- sysfs_attach_dirent(sd, NULL, shadow);
+ sysfs_addrm_start(&acxt, parent_sd);
+
+ /* add but don't link into children list */
+ sysfs_add_one(&acxt, sd);
+
+ /* attach and instantiate dentry */
+ sysfs_attach_dentry(sd, shadow);
d_instantiate(shadow, igrab(inode));
- inc_nlink(inode);
- inc_nlink(parent->d_inode);
+ inc_nlink(inode); /* tj: synchronization? */
+
+ sysfs_addrm_finish(&acxt);
dget(shadow); /* Extra count - pin the dentry in core */
out:
- return shadow;
+ return sd;
nomem:
dput(shadow);
- shadow = ERR_PTR(-ENOMEM);
+ sd = ERR_PTR(-ENOMEM);
goto out;
}
/**
* sysfs_remove_shadow_dir - remove an object's directory.
- * @shadow: dentry of shadow directory
+ * @shadow_sd: sysfs_dirent of shadow directory
*
* The only thing special about this is that we remove any files in
* the directory before we remove the directory, and we've inlined
* what used to be sysfs_rmdir() below, instead of calling separately.
*/
-void sysfs_remove_shadow_dir(struct dentry *shadow)
+void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd)
{
- __sysfs_remove_dir(shadow);
+ __sysfs_remove_dir(shadow_sd);
}
const struct file_operations sysfs_dir_operations = {
projects / linux-2.6-omap-h63xx.git / blobdiff