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sysfs: split out binary attribute handling from sysfs_add_file_mode_ns
Split adding binary attributes into a separate handler instead of overloading sysfs_add_file_mode_ns. Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210913054121.616001-5-hch@lst.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig
Greg Kroah-Hartman
parent
eaf501e0d8
commit
5cf3bb0d3a
120
fs/sysfs/file.c
120
fs/sysfs/file.c
@ -255,59 +255,38 @@ static const struct kernfs_ops sysfs_bin_kfops_mmap = {
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};
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int sysfs_add_file_mode_ns(struct kernfs_node *parent,
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const struct attribute *attr, bool is_bin,
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umode_t mode, kuid_t uid, kgid_t gid, const void *ns)
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const struct attribute *attr, umode_t mode, kuid_t uid,
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kgid_t gid, const void *ns)
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{
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struct kobject *kobj = parent->priv;
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const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
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struct lock_class_key *key = NULL;
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const struct kernfs_ops *ops;
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struct kernfs_node *kn;
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loff_t size;
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if (!is_bin) {
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struct kobject *kobj = parent->priv;
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const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
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/* every kobject with an attribute needs a ktype assigned */
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if (WARN(!sysfs_ops, KERN_ERR
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"missing sysfs attribute operations for kobject: %s\n",
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kobject_name(kobj)))
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return -EINVAL;
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/* every kobject with an attribute needs a ktype assigned */
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if (WARN(!sysfs_ops, KERN_ERR
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"missing sysfs attribute operations for kobject: %s\n",
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kobject_name(kobj)))
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return -EINVAL;
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if (sysfs_ops->show && sysfs_ops->store) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_rw;
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else
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ops = &sysfs_file_kfops_rw;
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} else if (sysfs_ops->show) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_ro;
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else
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ops = &sysfs_file_kfops_ro;
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} else if (sysfs_ops->store) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_wo;
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else
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ops = &sysfs_file_kfops_wo;
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} else
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ops = &sysfs_file_kfops_empty;
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size = PAGE_SIZE;
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} else {
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struct bin_attribute *battr = (void *)attr;
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if (battr->mmap)
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ops = &sysfs_bin_kfops_mmap;
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else if (battr->read && battr->write)
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ops = &sysfs_bin_kfops_rw;
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else if (battr->read)
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ops = &sysfs_bin_kfops_ro;
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else if (battr->write)
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ops = &sysfs_bin_kfops_wo;
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if (sysfs_ops->show && sysfs_ops->store) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_rw;
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else
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ops = &sysfs_file_kfops_empty;
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size = battr->size;
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}
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ops = &sysfs_file_kfops_rw;
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} else if (sysfs_ops->show) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_ro;
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else
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ops = &sysfs_file_kfops_ro;
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} else if (sysfs_ops->store) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_wo;
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else
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ops = &sysfs_file_kfops_wo;
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} else
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ops = &sysfs_file_kfops_empty;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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if (!attr->ignore_lockdep)
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@ -315,7 +294,42 @@ int sysfs_add_file_mode_ns(struct kernfs_node *parent,
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#endif
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kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
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size, ops, (void *)attr, ns, key);
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PAGE_SIZE, ops, (void *)attr, ns, key);
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if (IS_ERR(kn)) {
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if (PTR_ERR(kn) == -EEXIST)
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sysfs_warn_dup(parent, attr->name);
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return PTR_ERR(kn);
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}
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return 0;
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}
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int sysfs_add_bin_file_mode_ns(struct kernfs_node *parent,
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const struct bin_attribute *battr, umode_t mode,
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kuid_t uid, kgid_t gid, const void *ns)
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{
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const struct attribute *attr = &battr->attr;
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struct lock_class_key *key = NULL;
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const struct kernfs_ops *ops;
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struct kernfs_node *kn;
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if (battr->mmap)
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ops = &sysfs_bin_kfops_mmap;
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else if (battr->read && battr->write)
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ops = &sysfs_bin_kfops_rw;
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else if (battr->read)
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ops = &sysfs_bin_kfops_ro;
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else if (battr->write)
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ops = &sysfs_bin_kfops_wo;
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else
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ops = &sysfs_file_kfops_empty;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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if (!attr->ignore_lockdep)
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key = attr->key ?: (struct lock_class_key *)&attr->skey;
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#endif
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kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
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battr->size, ops, (void *)attr, ns, key);
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if (IS_ERR(kn)) {
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if (PTR_ERR(kn) == -EEXIST)
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sysfs_warn_dup(parent, attr->name);
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@ -340,9 +354,7 @@ int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr,
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return -EINVAL;
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kobject_get_ownership(kobj, &uid, &gid);
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return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode,
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uid, gid, ns);
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return sysfs_add_file_mode_ns(kobj->sd, attr, attr->mode, uid, gid, ns);
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}
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EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
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@ -385,8 +397,8 @@ int sysfs_add_file_to_group(struct kobject *kobj,
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return -ENOENT;
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kobject_get_ownership(kobj, &uid, &gid);
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error = sysfs_add_file_mode_ns(parent, attr, false,
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attr->mode, uid, gid, NULL);
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error = sysfs_add_file_mode_ns(parent, attr, attr->mode, uid, gid,
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NULL);
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kernfs_put(parent);
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return error;
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@ -555,8 +567,8 @@ int sysfs_create_bin_file(struct kobject *kobj,
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return -EINVAL;
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kobject_get_ownership(kobj, &uid, &gid);
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return sysfs_add_file_mode_ns(kobj->sd, &attr->attr, true,
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attr->attr.mode, uid, gid, NULL);
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return sysfs_add_bin_file_mode_ns(kobj->sd, attr, attr->attr.mode, uid,
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gid, NULL);
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}
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EXPORT_SYMBOL_GPL(sysfs_create_bin_file);
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@ -61,8 +61,8 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
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(*attr)->name, mode);
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mode &= SYSFS_PREALLOC | 0664;
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error = sysfs_add_file_mode_ns(parent, *attr, false,
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mode, uid, gid, NULL);
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error = sysfs_add_file_mode_ns(parent, *attr, mode, uid,
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gid, NULL);
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if (unlikely(error))
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break;
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}
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@ -90,10 +90,9 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
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(*bin_attr)->attr.name, mode);
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mode &= SYSFS_PREALLOC | 0664;
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error = sysfs_add_file_mode_ns(parent,
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&(*bin_attr)->attr, true,
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mode,
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uid, gid, NULL);
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error = sysfs_add_bin_file_mode_ns(parent, *bin_attr,
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mode, uid, gid,
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NULL);
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if (error)
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break;
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}
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@ -340,8 +339,8 @@ int sysfs_merge_group(struct kobject *kobj,
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kobject_get_ownership(kobj, &uid, &gid);
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for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr))
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error = sysfs_add_file_mode_ns(parent, *attr, false,
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(*attr)->mode, uid, gid, NULL);
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error = sysfs_add_file_mode_ns(parent, *attr, (*attr)->mode,
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uid, gid, NULL);
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if (error) {
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while (--i >= 0)
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kernfs_remove_by_name(parent, (*--attr)->name);
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@ -28,9 +28,11 @@ void sysfs_warn_dup(struct kernfs_node *parent, const char *name);
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* file.c
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*/
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int sysfs_add_file_mode_ns(struct kernfs_node *parent,
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const struct attribute *attr, bool is_bin,
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umode_t amode, kuid_t uid, kgid_t gid,
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const void *ns);
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const struct attribute *attr, umode_t amode, kuid_t uid,
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kgid_t gid, const void *ns);
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int sysfs_add_bin_file_mode_ns(struct kernfs_node *parent,
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const struct bin_attribute *battr, umode_t mode,
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kuid_t uid, kgid_t gid, const void *ns);
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/*
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* symlink.c
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