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| author | David Sterba <dsterba@suse.com> | 2017-03-28 15:44:21 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 15:07:25 +0300 |
| commit | 171938e528079deced3226a17dcab12121312a64 (patch) | |
| tree | d49869102dade6b05e5736b0df6fd48301e43bb7 /fs/btrfs/volumes.c | |
| parent | 48a89bc4f2ceab87bc858a8eb189636b09c846a7 (diff) | |
| download | linux-171938e528079deced3226a17dcab12121312a64.tar.xz | |
btrfs: track exclusive filesystem operation in flags
There are several operations, usually started from ioctls, that cannot
run concurrently. The status is tracked in
mutually_exclusive_operation_running as an atomic_t. We can easily track
the status as one of the per-filesystem flag bits with same
synchronization guarantees.
The conversion replaces:
* atomic_xchg(..., 1) -> test_and_set_bit(FLAG, ...)
* atomic_set(..., 0) -> clear_bit(FLAG, ...)
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index df50a63bbc3f..2e425a909125 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -3761,7 +3761,7 @@ static void __cancel_balance(struct btrfs_fs_info *fs_info) if (ret) btrfs_handle_fs_error(fs_info, ret, NULL); - atomic_set(&fs_info->mutually_exclusive_operation_running, 0); + clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); } /* Non-zero return value signifies invalidity */ @@ -3941,7 +3941,7 @@ out: __cancel_balance(fs_info); else { kfree(bctl); - atomic_set(&fs_info->mutually_exclusive_operation_running, 0); + clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); } return ret; } @@ -4031,7 +4031,7 @@ int btrfs_recover_balance(struct btrfs_fs_info *fs_info) btrfs_balance_sys(leaf, item, &disk_bargs); btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs); - WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)); + WARN_ON(test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); mutex_lock(&fs_info->volume_mutex); mutex_lock(&fs_info->balance_mutex); |