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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/ctree.h | |
| 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/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index e9d77115e695..70631d773669 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -705,6 +705,11 @@ struct btrfs_delayed_root; #define BTRFS_FS_BTREE_ERR 11 #define BTRFS_FS_LOG1_ERR 12 #define BTRFS_FS_LOG2_ERR 13 +/* + * Indicate that a whole-filesystem exclusive operation is running + * (device replace, resize, device add/delete, balance) + */ +#define BTRFS_FS_EXCL_OP 14 struct btrfs_fs_info { u8 fsid[BTRFS_FSID_SIZE]; @@ -1070,8 +1075,6 @@ struct btrfs_fs_info { /* device replace state */ struct btrfs_dev_replace dev_replace; - atomic_t mutually_exclusive_operation_running; - struct percpu_counter bio_counter; wait_queue_head_t replace_wait; |