From 443f24fee731703345e2e6eec8177bb7b7d094c6 Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Thu, 24 Jul 2014 11:37:15 +0800 Subject: [PATCH] Btrfs: cleanup unused latest_devid and latest_trans in fs_devices The member variants - latest_devid and latest_trans - of fs_devices structure are set, but no one use them to do anything. so remove them. Signed-off-by: Miao Xie Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 42 +++++++++++------------------------------- fs/btrfs/volumes.h | 3 --- 2 files changed, 11 insertions(+), 34 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index e04424490f12..46cd29ad3156 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -475,14 +475,13 @@ static noinline int device_list_add(const char *path, return PTR_ERR(fs_devices); list_add(&fs_devices->list, &fs_uuids); - fs_devices->latest_devid = devid; - fs_devices->latest_trans = found_transid; device = NULL; } else { device = __find_device(&fs_devices->devices, devid, disk_super->dev_item.uuid); } + if (!device) { if (fs_devices->opened) return -EBUSY; @@ -567,10 +566,6 @@ static noinline int device_list_add(const char *path, if (!fs_devices->opened) device->generation = found_transid; - if (found_transid > fs_devices->latest_trans) { - fs_devices->latest_devid = devid; - fs_devices->latest_trans = found_transid; - } *fs_devices_ret = fs_devices; return ret; @@ -586,8 +581,6 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) if (IS_ERR(fs_devices)) return fs_devices; - fs_devices->latest_devid = orig->latest_devid; - fs_devices->latest_trans = orig->latest_trans; fs_devices->total_devices = orig->total_devices; /* We have held the volume lock, it is safe to get the devices. */ @@ -626,10 +619,7 @@ void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info, struct btrfs_fs_devices *fs_devices, int step) { struct btrfs_device *device, *next; - - struct block_device *latest_bdev = NULL; - u64 latest_devid = 0; - u64 latest_transid = 0; + struct btrfs_device *latest_dev = NULL; mutex_lock(&uuid_mutex); again: @@ -637,11 +627,9 @@ again: list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { if (device->in_fs_metadata) { if (!device->is_tgtdev_for_dev_replace && - (!latest_transid || - device->generation > latest_transid)) { - latest_devid = device->devid; - latest_transid = device->generation; - latest_bdev = device->bdev; + (!latest_dev || + device->generation > latest_dev->generation)) { + latest_dev = device; } continue; } @@ -683,9 +671,7 @@ again: goto again; } - fs_devices->latest_bdev = latest_bdev; - fs_devices->latest_devid = latest_devid; - fs_devices->latest_trans = latest_transid; + fs_devices->latest_bdev = latest_dev->bdev; mutex_unlock(&uuid_mutex); } @@ -800,11 +786,9 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, struct block_device *bdev; struct list_head *head = &fs_devices->devices; struct btrfs_device *device; - struct block_device *latest_bdev = NULL; + struct btrfs_device *latest_dev = NULL; struct buffer_head *bh; struct btrfs_super_block *disk_super; - u64 latest_devid = 0; - u64 latest_transid = 0; u64 devid; int seeding = 1; int ret = 0; @@ -832,11 +816,9 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, goto error_brelse; device->generation = btrfs_super_generation(disk_super); - if (!latest_transid || device->generation > latest_transid) { - latest_devid = devid; - latest_transid = device->generation; - latest_bdev = bdev; - } + if (!latest_dev || + device->generation > latest_dev->generation) + latest_dev = device; if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { device->writeable = 0; @@ -879,9 +861,7 @@ error_brelse: } fs_devices->seeding = seeding; fs_devices->opened = 1; - fs_devices->latest_bdev = latest_bdev; - fs_devices->latest_devid = latest_devid; - fs_devices->latest_trans = latest_transid; + fs_devices->latest_bdev = latest_dev->bdev; fs_devices->total_rw_bytes = 0; out: return ret; diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 90d4fa80bd58..e894ac696889 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -119,9 +119,6 @@ struct btrfs_device { struct btrfs_fs_devices { u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ - /* the device with this id has the most recent copy of the super */ - u64 latest_devid; - u64 latest_trans; u64 num_devices; u64 open_devices; u64 rw_devices;