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block-dev: enable writeback cgroup support

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block_dev's .writepages/.writepage already handles
wbc_init_bio/wbc_account_io. We only set the SB_I_CGROUPWB bit to
suppport writeback cgroup support.

Signed-off-by: Shaohua Li <shli@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Shaohua Li 2016-02-22 15:27:40 -07:00 • committed by Jens Axboe
parent e9137d4b93
commit 3684aa7099
1 changed files with 5 additions and 1 deletions
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6
fs/block_dev.c
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@ -575,7 +575,11 @@ static const struct super_operations bdev_sops = {
static struct dentry *bd_mount(struct file_system_type *fs_type, static struct dentry *bd_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data) int flags, const char *dev_name, void *data)
{ {
return mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC); struct dentry *dent;
dent = mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC);
if (dent)
dent->d_sb->s_iflags |= SB_I_CGROUPWB;
return dent;
} }
static struct file_system_type bd_type = { static struct file_system_type bd_type = {