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btrfs: cleanup helpers that reset balance state 

The function __cancel_balance name is confusing with the cancel
operation of balance and it really resets the state of balance back to
zero. The unset_balance_control helper is called only from one place and
simple enough to be inlined.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2018-03-20 20:23:09 +01:00
parent eee95e3fb0
commit 149196a2ae
2 changed files with 17 additions and 20 deletions
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8
fs/btrfs/ioctl.c
View File

@ -4459,10 +4459,10 @@ locked:
do_balance:
/*
* Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP
* goes to to btrfs_balance. bctl is freed in __cancel_balance,
* or, if restriper was paused all the way until unmount, in
* free_fs_info. The flag should be cleared after __cancel_balance.
* Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
* btrfs_balance. bctl is freed in reset_balance_state, or, if
* restriper was paused all the way until unmount, in free_fs_info.
* The flag should be cleared after reset_balance_state.
*/
need_unlock = false;

29
fs/btrfs/volumes.c
View File

@ -3212,7 +3212,7 @@ static void update_balance_args(struct btrfs_balance_control *bctl)
/*
* Should be called with both balance and volume mutexes held to
* serialize other volume operations (add_dev/rm_dev/resize) with
* restriper. Same goes for unset_balance_control.
* restriper. Same goes for reset_balance_state.
*/
static void set_balance_control(struct btrfs_balance_control *bctl)
{
@ -3225,9 +3225,13 @@ static void set_balance_control(struct btrfs_balance_control *bctl)
spin_unlock(&fs_info->balance_lock);
}
static void unset_balance_control(struct btrfs_fs_info *fs_info)
/*
* Clear the balance status in fs_info and delete the balance item from disk.
*/
static void reset_balance_state(struct btrfs_fs_info *fs_info)
{
struct btrfs_balance_control *bctl = fs_info->balance_ctl;
int ret;
BUG_ON(!fs_info->balance_ctl);
@ -3236,6 +3240,9 @@ static void unset_balance_control(struct btrfs_fs_info *fs_info)
spin_unlock(&fs_info->balance_lock);
kfree(bctl);
ret = del_balance_item(fs_info);
if (ret)
btrfs_handle_fs_error(fs_info, ret, NULL);
}
/*
@ -3772,16 +3779,6 @@ static inline int balance_need_close(struct btrfs_fs_info *fs_info)
atomic_read(&fs_info->balance_cancel_req) == 0);
}
static void __cancel_balance(struct btrfs_fs_info *fs_info)
{
int ret;
unset_balance_control(fs_info);
ret = del_balance_item(fs_info);
if (ret)
btrfs_handle_fs_error(fs_info, ret, NULL);
}
/* Non-zero return value signifies invalidity */
static inline int validate_convert_profile(struct btrfs_balance_args *bctl_arg,
u64 allowed)
@ -3936,7 +3933,7 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
if ((ret && ret != -ECANCELED && ret != -ENOSPC) ||
balance_need_close(fs_info)) {
__cancel_balance(fs_info);
reset_balance_state(fs_info);
clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
}
@ -3945,7 +3942,7 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
return ret;
out:
if (bctl->flags & BTRFS_BALANCE_RESUME)
__cancel_balance(fs_info);
reset_balance_state(fs_info);
else
kfree(bctl);
clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
@ -4124,13 +4121,13 @@ int btrfs_cancel_balance(struct btrfs_fs_info *fs_info)
atomic_read(&fs_info->balance_running) == 0);
mutex_lock(&fs_info->balance_mutex);
} else {
/* __cancel_balance needs volume_mutex */
/* reset_balance_state needs volume_mutex */
mutex_unlock(&fs_info->balance_mutex);
mutex_lock(&fs_info->volume_mutex);
mutex_lock(&fs_info->balance_mutex);
if (fs_info->balance_ctl) {
__cancel_balance(fs_info);
reset_balance_state(fs_info);
clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
}