From 171938e528079deced3226a17dcab12121312a64 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Tue, 28 Mar 2017 14:44:21 +0200 Subject: 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 Signed-off-by: David Sterba --- fs/btrfs/dev-replace.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'fs/btrfs/dev-replace.c') diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index e653921f05d9..de7b2c897fe0 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -784,8 +784,7 @@ int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) } btrfs_dev_replace_unlock(dev_replace, 1); - WARN_ON(atomic_xchg( - &fs_info->mutually_exclusive_operation_running, 1)); + WARN_ON(test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); return PTR_ERR_OR_ZERO(task); } @@ -814,7 +813,7 @@ static int btrfs_dev_replace_kthread(void *data) (unsigned int)progress); } btrfs_dev_replace_continue_on_mount(fs_info); - atomic_set(&fs_info->mutually_exclusive_operation_running, 0); + clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); return 0; } -- cgit v1.2.3