From 5dc397113d195a004899ee672c5a8a19809495ba Mon Sep 17 00:00:00 2001 From: Riccardo Schirone Date: Thu, 11 Jan 2018 15:34:04 -0500 Subject: ext4: create ext4_kset dynamically ksets contain a kobject and they should always be allocated dynamically, because it is unknown to whoever creates them when ksets can be released. Signed-off-by: Riccardo Schirone Signed-off-by: Theodore Ts'o --- fs/ext4/sysfs.c | 39 +++++++++++++++++++++++++-------------- 1 file changed, 25 insertions(+), 14 deletions(-) diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c index 192ade7d6fe6..1205261f130c 100644 --- a/fs/ext4/sysfs.c +++ b/fs/ext4/sysfs.c @@ -330,6 +330,13 @@ static void ext4_sb_release(struct kobject *kobj) complete(&sbi->s_kobj_unregister); } +static void ext4_kset_release(struct kobject *kobj) +{ + struct kset *kset = container_of(kobj, struct kset, kobj); + + kfree(kset); +} + static const struct sysfs_ops ext4_attr_ops = { .show = ext4_attr_show, .store = ext4_attr_store, @@ -343,11 +350,10 @@ static struct kobj_type ext4_sb_ktype = { static struct kobj_type ext4_ktype = { .sysfs_ops = &ext4_attr_ops, + .release = ext4_kset_release, }; -static struct kset ext4_kset = { - .kobj = {.ktype = &ext4_ktype}, -}; +static struct kset *ext4_kset; static struct kobj_type ext4_feat_ktype = { .default_attrs = ext4_feat_attrs, @@ -392,7 +398,7 @@ int ext4_register_sysfs(struct super_block *sb) const struct ext4_proc_files *p; int err; - sbi->s_kobj.kset = &ext4_kset; + sbi->s_kobj.kset = ext4_kset; init_completion(&sbi->s_kobj_unregister); err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL, "%s", sb->s_id); @@ -430,13 +436,16 @@ int __init ext4_init_sysfs(void) { int ret; - kobject_set_name(&ext4_kset.kobj, "ext4"); - ext4_kset.kobj.parent = fs_kobj; - ret = kset_register(&ext4_kset); - if (ret) { - kset_unregister(&ext4_kset); - return ret; - } + ext4_kset = kzalloc(sizeof(*ext4_kset), GFP_KERNEL); + if (!ext4_kset) + return -ENOMEM; + + kobject_set_name(&ext4_kset->kobj, "ext4"); + ext4_kset->kobj.parent = fs_kobj; + ext4_kset->kobj.ktype = &ext4_ktype; + ret = kset_register(ext4_kset); + if (ret) + goto kset_err; ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); if (!ext4_feat) { @@ -444,7 +453,7 @@ int __init ext4_init_sysfs(void) goto kset_err; } - ext4_feat->kset = &ext4_kset; + ext4_feat->kset = ext4_kset; ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, NULL, "features"); if (ret) @@ -456,14 +465,16 @@ int __init ext4_init_sysfs(void) feat_err: kobject_put(ext4_feat); kset_err: - kset_unregister(&ext4_kset); + kset_unregister(ext4_kset); + ext4_kset = NULL; return ret; } void ext4_exit_sysfs(void) { kobject_put(ext4_feat); - kset_unregister(&ext4_kset); + kset_unregister(ext4_kset); + ext4_kset = NULL; remove_proc_entry(proc_dirname, NULL); ext4_proc_root = NULL; } -- cgit v1.2.3