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btrfs: factor sysfs code out of link_block_group

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The part of link_block_group that just creates the sysfs object is
independent and can be factored out to a helper.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-08-01 17:49:55 +02:00
parent 89439109bc
commit 32a9991f15
3 changed files with 49 additions and 35 deletions
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37
fs/btrfs/extent-tree.c
View file

@ -4,7 +4,6 @@
*/
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/sched/signal.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
@ -7573,7 +7572,6 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
static void link_block_group(struct btrfs_block_group_cache *cache)
{
struct btrfs_space_info *space_info = cache->space_info;
struct btrfs_fs_info *fs_info = cache->fs_info;
int index = btrfs_bg_flags_to_raid_index(cache->flags);
bool first = false;
@ -7583,39 +7581,8 @@ static void link_block_group(struct btrfs_block_group_cache *cache)
list_add_tail(&cache->list, &space_info->block_groups[index]);
up_write(&space_info->groups_sem);
if (first) {
struct raid_kobject *rkobj;
unsigned int nofs_flag;
int ret;
/*
* Setup a NOFS context because kobject_add(), deep in its call
* chain, does GFP_KERNEL allocations, and we are often called
* in a context where if reclaim is triggered we can deadlock
* (we are either holding a transaction handle or some lock
* required for a transaction commit).
*/
nofs_flag = memalloc_nofs_save();
rkobj = kzalloc(sizeof(*rkobj), GFP_KERNEL);
if (!rkobj) {
memalloc_nofs_restore(nofs_flag);
btrfs_warn(cache->fs_info,
"couldn't alloc memory for raid level kobject");
return;
}
rkobj->flags = cache->flags;
kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
btrfs_bg_type_to_raid_name(rkobj->flags));
memalloc_nofs_restore(nofs_flag);
if (ret) {
kobject_put(&rkobj->kobj);
btrfs_warn(fs_info,
"failed to add kobject for block cache, ignoring");
return;
}
space_info->block_group_kobjs[index] = &rkobj->kobj;
}
if (first)
btrfs_sysfs_add_block_group_type(cache);
}
static struct btrfs_block_group_cache *

46
fs/btrfs/sysfs.c
View file

@ -4,6 +4,7 @@
*/
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
@ -749,6 +750,51 @@ static void init_feature_attrs(void)
}
}
/*
* Create a sysfs entry for a given block group type at path
* /sys/fs/btrfs/UUID/allocation/data/TYPE
*/
void btrfs_sysfs_add_block_group_type(struct btrfs_block_group_cache *cache)
{
struct btrfs_fs_info *fs_info = cache->fs_info;
struct btrfs_space_info *space_info = cache->space_info;
struct raid_kobject *rkobj;
const int index = btrfs_bg_flags_to_raid_index(cache->flags);
unsigned int nofs_flag;
int ret;
/*
* Setup a NOFS context because kobject_add(), deep in its call chain,
* does GFP_KERNEL allocations, and we are often called in a context
* where if reclaim is triggered we can deadlock (we are either holding
* a transaction handle or some lock required for a transaction
* commit).
*/
nofs_flag = memalloc_nofs_save();
rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
if (!rkobj) {
memalloc_nofs_restore(nofs_flag);
btrfs_warn(cache->fs_info,
"couldn't alloc memory for raid level kobject");
return;
}
rkobj->flags = cache->flags;
kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
btrfs_bg_type_to_raid_name(rkobj->flags));
memalloc_nofs_restore(nofs_flag);
if (ret) {
kobject_put(&rkobj->kobj);
btrfs_warn(fs_info,
"failed to add kobject for block cache, ignoring");
return;
}
space_info->block_group_kobjs[index] = &rkobj->kobj;
}
/* when one_device is NULL, it removes all device links */
int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,

1
fs/btrfs/sysfs.h
View file

@ -96,5 +96,6 @@ int __init btrfs_init_sysfs(void);
void __cold btrfs_exit_sysfs(void);
int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
void btrfs_sysfs_add_block_group_type(struct btrfs_block_group_cache *cache);
#endif