diff options
| author | Josef Bacik | 2012-06-21 22:03:58 +0200 |
|---|---|---|
| committer | Chris Mason | 2012-07-23 22:27:42 +0200 |
| commit | 02db0844beffc1c4e99d750be58ffb3ed95d6d62 (patch) | |
| tree | ee82fa926f2900e24a1ca76eab6a85a32f453898 /fs/btrfs/volumes.c | |
| parent | Btrfs: flush delayed inodes if we're short on space (diff) | |
| download | kernel-qcow2-linux-02db0844beffc1c4e99d750be58ffb3ed95d6d62.tar.gz kernel-qcow2-linux-02db0844beffc1c4e99d750be58ffb3ed95d6d62.tar.xz kernel-qcow2-linux-02db0844beffc1c4e99d750be58ffb3ed95d6d62.zip | |
Btrfs: add DEVICE_READY ioctl
This will be used in conjunction with btrfs device ready <dev>. This is
needed for initrd's to have a nice and lightweight way to tell if all of the
devices needed for a file system are in the cache currently. This keeps
them from having to do mount+sleep loops waiting for devices to show up.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 957bf393ab46..39a0d04759f8 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -429,6 +429,7 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) mutex_init(&fs_devices->device_list_mutex); fs_devices->latest_devid = orig->latest_devid; fs_devices->latest_trans = orig->latest_trans; + fs_devices->total_devices = orig->total_devices; memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); /* We have held the volume lock, it is safe to get the devices. */ @@ -739,6 +740,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, int ret; u64 devid; u64 transid; + u64 total_devices; flags |= FMODE_EXCL; bdev = blkdev_get_by_path(path, flags, holder); @@ -760,6 +762,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, disk_super = (struct btrfs_super_block *)bh->b_data; devid = btrfs_stack_device_id(&disk_super->dev_item); transid = btrfs_super_generation(disk_super); + total_devices = btrfs_super_num_devices(disk_super); if (disk_super->label[0]) printk(KERN_INFO "device label %s ", disk_super->label); else @@ -767,7 +770,8 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, printk(KERN_CONT "devid %llu transid %llu %s\n", (unsigned long long)devid, (unsigned long long)transid, path); ret = device_list_add(path, disk_super, devid, fs_devices_ret); - + if (!ret && fs_devices_ret) + (*fs_devices_ret)->total_devices = total_devices; brelse(bh); error_close: mutex_unlock(&uuid_mutex); @@ -1433,6 +1437,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) list_del_rcu(&device->dev_list); device->fs_devices->num_devices--; + device->fs_devices->total_devices--; if (device->missing) root->fs_info->fs_devices->missing_devices--; @@ -1550,6 +1555,7 @@ static int btrfs_prepare_sprout(struct btrfs_root *root) fs_devices->seeding = 0; fs_devices->num_devices = 0; fs_devices->open_devices = 0; + fs_devices->total_devices = 0; fs_devices->seed = seed_devices; generate_random_uuid(fs_devices->fsid); @@ -1749,6 +1755,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path) root->fs_info->fs_devices->num_devices++; root->fs_info->fs_devices->open_devices++; root->fs_info->fs_devices->rw_devices++; + root->fs_info->fs_devices->total_devices++; if (device->can_discard) root->fs_info->fs_devices->num_can_discard++; root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |