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Diffstat (limited to 'fs/btrfs/sysfs.c')
-rw-r--r--fs/btrfs/sysfs.c148
1 files changed, 109 insertions, 39 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index e8a4c86d2..603b0cc2b 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -33,6 +33,7 @@
#include "volumes.h"
static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
+static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
static u64 get_features(struct btrfs_fs_info *fs_info,
enum btrfs_feature_set set)
@@ -428,7 +429,7 @@ static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show);
-static struct attribute *btrfs_attrs[] = {
+static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(label),
BTRFS_ATTR_PTR(nodesize),
BTRFS_ATTR_PTR(sectorsize),
@@ -438,21 +439,29 @@ static struct attribute *btrfs_attrs[] = {
static void btrfs_release_super_kobj(struct kobject *kobj)
{
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- complete(&fs_info->kobj_unregister);
+ struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
+
+ memset(&fs_devs->super_kobj, 0, sizeof(struct kobject));
+ complete(&fs_devs->kobj_unregister);
}
static struct kobj_type btrfs_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.release = btrfs_release_super_kobj,
- .default_attrs = btrfs_attrs,
};
+static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
+{
+ if (kobj->ktype != &btrfs_ktype)
+ return NULL;
+ return container_of(kobj, struct btrfs_fs_devices, super_kobj);
+}
+
static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
{
if (kobj->ktype != &btrfs_ktype)
return NULL;
- return container_of(kobj, struct btrfs_fs_info, super_kobj);
+ return to_fs_devs(kobj)->fs_info;
}
#define NUM_FEATURE_BITS 64
@@ -493,12 +502,12 @@ static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
attrs[0] = &fa->kobj_attr.attr;
if (add) {
int ret;
- ret = sysfs_merge_group(&fs_info->super_kobj,
+ ret = sysfs_merge_group(&fs_info->fs_devices->super_kobj,
&agroup);
if (ret)
return ret;
} else
- sysfs_unmerge_group(&fs_info->super_kobj,
+ sysfs_unmerge_group(&fs_info->fs_devices->super_kobj,
&agroup);
}
@@ -506,25 +515,49 @@ static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
return 0;
}
-static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
+static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
+{
+ if (fs_devs->device_dir_kobj) {
+ kobject_del(fs_devs->device_dir_kobj);
+ kobject_put(fs_devs->device_dir_kobj);
+ fs_devs->device_dir_kobj = NULL;
+ }
+
+ if (fs_devs->super_kobj.state_initialized) {
+ kobject_del(&fs_devs->super_kobj);
+ kobject_put(&fs_devs->super_kobj);
+ wait_for_completion(&fs_devs->kobj_unregister);
+ }
+}
+
+/* when fs_devs is NULL it will remove all fsid kobject */
+void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
{
- kobject_del(&fs_info->super_kobj);
- kobject_put(&fs_info->super_kobj);
- wait_for_completion(&fs_info->kobj_unregister);
+ struct list_head *fs_uuids = btrfs_get_fs_uuids();
+
+ if (fs_devs) {
+ __btrfs_sysfs_remove_fsid(fs_devs);
+ return;
+ }
+
+ list_for_each_entry(fs_devs, fs_uuids, list) {
+ __btrfs_sysfs_remove_fsid(fs_devs);
+ }
}
void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
{
+ btrfs_reset_fs_info_ptr(fs_info);
+
if (fs_info->space_info_kobj) {
sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
kobject_del(fs_info->space_info_kobj);
kobject_put(fs_info->space_info_kobj);
}
- kobject_del(fs_info->device_dir_kobj);
- kobject_put(fs_info->device_dir_kobj);
addrm_unknown_feature_attrs(fs_info, false);
- sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group);
- __btrfs_sysfs_remove_one(fs_info);
+ sysfs_remove_group(&fs_info->fs_devices->super_kobj, &btrfs_feature_attr_group);
+ sysfs_remove_files(&fs_info->fs_devices->super_kobj, btrfs_attrs);
+ btrfs_kobj_rm_device(fs_info->fs_devices, NULL);
}
const char * const btrfs_feature_set_names[3] = {
@@ -602,40 +635,60 @@ static void init_feature_attrs(void)
}
}
-int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
+/* when one_device is NULL, it removes all device links */
+
+int btrfs_kobj_rm_device(struct btrfs_fs_devices *fs_devices,
struct btrfs_device *one_device)
{
struct hd_struct *disk;
struct kobject *disk_kobj;
- if (!fs_info->device_dir_kobj)
+ if (!fs_devices->device_dir_kobj)
return -EINVAL;
if (one_device && one_device->bdev) {
disk = one_device->bdev->bd_part;
disk_kobj = &part_to_dev(disk)->kobj;
- sysfs_remove_link(fs_info->device_dir_kobj,
+ sysfs_remove_link(fs_devices->device_dir_kobj,
+ disk_kobj->name);
+ }
+
+ if (one_device)
+ return 0;
+
+ list_for_each_entry(one_device,
+ &fs_devices->devices, dev_list) {
+ if (!one_device->bdev)
+ continue;
+ disk = one_device->bdev->bd_part;
+ disk_kobj = &part_to_dev(disk)->kobj;
+
+ sysfs_remove_link(fs_devices->device_dir_kobj,
disk_kobj->name);
}
return 0;
}
-int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
- struct btrfs_device *one_device)
+int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
{
- int error = 0;
- struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
- struct btrfs_device *dev;
-
- if (!fs_info->device_dir_kobj)
- fs_info->device_dir_kobj = kobject_create_and_add("devices",
- &fs_info->super_kobj);
+ if (!fs_devs->device_dir_kobj)
+ fs_devs->device_dir_kobj = kobject_create_and_add("devices",
+ &fs_devs->super_kobj);
- if (!fs_info->device_dir_kobj)
+ if (!fs_devs->device_dir_kobj)
return -ENOMEM;
+ return 0;
+}
+
+int btrfs_kobj_add_device(struct btrfs_fs_devices *fs_devices,
+ struct btrfs_device *one_device)
+{
+ int error = 0;
+ struct btrfs_device *dev;
+
list_for_each_entry(dev, &fs_devices->devices, dev_list) {
struct hd_struct *disk;
struct kobject *disk_kobj;
@@ -649,7 +702,7 @@ int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
disk = dev->bdev->bd_part;
disk_kobj = &part_to_dev(disk)->kobj;
- error = sysfs_create_link(fs_info->device_dir_kobj,
+ error = sysfs_create_link(fs_devices->device_dir_kobj,
disk_kobj, disk_kobj->name);
if (error)
break;
@@ -667,34 +720,51 @@ static struct dentry *btrfs_debugfs_root_dentry;
/* Debugging tunables and exported data */
u64 btrfs_debugfs_test;
+/*
+ * Can be called by the device discovery thread.
+ * And parent can be specified for seed device
+ */
+int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
+ struct kobject *parent)
+{
+ int error;
+
+ init_completion(&fs_devs->kobj_unregister);
+ fs_devs->super_kobj.kset = btrfs_kset;
+ error = kobject_init_and_add(&fs_devs->super_kobj,
+ &btrfs_ktype, parent, "%pU", fs_devs->fsid);
+ return error;
+}
+
int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
{
int error;
+ struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
+ struct kobject *super_kobj = &fs_devs->super_kobj;
+
+ btrfs_set_fs_info_ptr(fs_info);
- init_completion(&fs_info->kobj_unregister);
- fs_info->super_kobj.kset = btrfs_kset;
- error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
- "%pU", fs_info->fsid);
+ error = btrfs_kobj_add_device(fs_devs, NULL);
if (error)
return error;
- error = sysfs_create_group(&fs_info->super_kobj,
- &btrfs_feature_attr_group);
+ error = sysfs_create_files(super_kobj, btrfs_attrs);
if (error) {
- __btrfs_sysfs_remove_one(fs_info);
+ btrfs_kobj_rm_device(fs_devs, NULL);
return error;
}
- error = addrm_unknown_feature_attrs(fs_info, true);
+ error = sysfs_create_group(super_kobj,
+ &btrfs_feature_attr_group);
if (error)
goto failure;
- error = btrfs_kobj_add_device(fs_info, NULL);
+ error = addrm_unknown_feature_attrs(fs_info, true);
if (error)
goto failure;
fs_info->space_info_kobj = kobject_create_and_add("allocation",
- &fs_info->super_kobj);
+ super_kobj);
if (!fs_info->space_info_kobj) {
error = -ENOMEM;
goto failure;