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Btrfs: cleanup unused num_can_discard in fs_devices 

The member variants - num_can_discard - of fs_devices structure
are set, but no one use them to do anything. so remove them.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Miao Xie 2014-09-03 21:35:30 +08:00 committed by Chris Mason
parent 82f70d62f7
commit 90180da42c
2 changed files with 2 additions and 15 deletions
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16
fs/btrfs/volumes.c
View File

@ -720,8 +720,6 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
fs_devices->rw_devices--;
}
if (device->can_discard)
fs_devices->num_can_discard--;
if (device->missing)
fs_devices->missing_devices--;
@ -828,10 +826,8 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
}
q = bdev_get_queue(bdev);
if (blk_queue_discard(q)) {
if (blk_queue_discard(q))
device->can_discard = 1;
fs_devices->num_can_discard++;
}
device->bdev = bdev;
device->in_fs_metadata = 0;
@ -1835,8 +1831,7 @@ void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
if (!fs_devices->seeding)
fs_devices->rw_devices++;
}
if (srcdev->can_discard)
fs_devices->num_can_discard--;
if (srcdev->bdev) {
fs_devices->open_devices--;
@ -1886,8 +1881,6 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
fs_info->fs_devices->open_devices--;
}
fs_info->fs_devices->num_devices--;
if (tgtdev->can_discard)
fs_info->fs_devices->num_can_discard++;
next_device = list_entry(fs_info->fs_devices->devices.next,
struct btrfs_device, dev_list);
@ -2008,7 +2001,6 @@ static int btrfs_prepare_sprout(struct btrfs_root *root)
fs_devices->num_devices = 0;
fs_devices->open_devices = 0;
fs_devices->missing_devices = 0;
fs_devices->num_can_discard = 0;
fs_devices->rotating = 0;
fs_devices->seed = seed_devices;
@ -2200,8 +2192,6 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
root->fs_info->fs_devices->open_devices++;
root->fs_info->fs_devices->rw_devices++;
root->fs_info->fs_devices->total_devices++;
if (device->can_discard)
root->fs_info->fs_devices->num_can_discard++;
root->fs_info->fs_devices->total_rw_bytes += device->total_bytes;
spin_lock(&root->fs_info->free_chunk_lock);
@ -2371,8 +2361,6 @@ int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
list_add(&device->dev_list, &fs_info->fs_devices->devices);
fs_info->fs_devices->num_devices++;
fs_info->fs_devices->open_devices++;
if (device->can_discard)
fs_info->fs_devices->num_can_discard++;
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
*device_out = device;

1
fs/btrfs/volumes.h
View File

@ -124,7 +124,6 @@ struct btrfs_fs_devices {
u64 rw_devices;
u64 missing_devices;
u64 total_rw_bytes;
u64 num_can_discard;
u64 total_devices;
struct block_device *latest_bdev;