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btrfs: cleanup assigning next active device with a check

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Creates helper fucntion as needed by the device delete
and replace operations. Also now it checks if the next
device being assigned is an active device.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2016-05-03 17:44:43 +08:00 committed by David Sterba
parent 8ed01abe7d
commit 88acff64c6
3 changed files with 48 additions and 22 deletions
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8
fs/btrfs/dev-replace.c
View File

@ -569,11 +569,9 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
ASSERT(list_empty(&src_device->resized_list));
tgt_device->commit_total_bytes = src_device->commit_total_bytes;
tgt_device->commit_bytes_used = src_device->bytes_used;
if (fs_info->sb->s_bdev &&
(fs_info->sb->s_bdev == src_device->bdev))
fs_info->sb->s_bdev = tgt_device->bdev;
if (fs_info->fs_devices->latest_bdev == src_device->bdev)
fs_info->fs_devices->latest_bdev = tgt_device->bdev;
btrfs_assign_next_active_device(fs_info, src_device, tgt_device);
list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
fs_info->fs_devices->rw_devices++;

60
fs/btrfs/volumes.c
View File

@ -1756,10 +1756,49 @@ static int btrfs_check_raid_min_devices(struct btrfs_fs_info *fs_info,
return 0;
}
struct btrfs_device *btrfs_find_next_active_device(struct btrfs_fs_devices *fs_devs,
struct btrfs_device *device)
{
struct btrfs_device *next_device;
list_for_each_entry(next_device, &fs_devs->devices, dev_list) {
if (next_device != device &&
!next_device->missing && next_device->bdev)
return next_device;
}
return NULL;
}
/*
* Helper function to check if the given device is part of s_bdev / latest_bdev
* and replace it with the provided or the next active device, in the context
* where this function called, there should be always be another device (or
* this_dev) which is active.
*/
void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info,
struct btrfs_device *device, struct btrfs_device *this_dev)
{
struct btrfs_device *next_device;
if (this_dev)
next_device = this_dev;
else
next_device = btrfs_find_next_active_device(fs_info->fs_devices,
device);
ASSERT(next_device);
if (fs_info->sb->s_bdev &&
(fs_info->sb->s_bdev == device->bdev))
fs_info->sb->s_bdev = next_device->bdev;
if (fs_info->fs_devices->latest_bdev == device->bdev)
fs_info->fs_devices->latest_bdev = next_device->bdev;
}
int btrfs_rm_device(struct btrfs_root *root, char *device_path, u64 devid)
{
struct btrfs_device *device;
struct btrfs_device *next_device;
struct btrfs_fs_devices *cur_devices;
u64 num_devices;
int ret = 0;
@ -1846,13 +1885,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path, u64 devid)
if (device->missing)
device->fs_devices->missing_devices--;
next_device = list_entry(root->fs_info->fs_devices->devices.next,
struct btrfs_device, dev_list);
if (root->fs_info->sb->s_bdev &&
(root->fs_info->sb->s_bdev == device->bdev))
root->fs_info->sb->s_bdev = next_device->bdev;
if (device->bdev == root->fs_info->fs_devices->latest_bdev)
root->fs_info->fs_devices->latest_bdev = next_device->bdev;
btrfs_assign_next_active_device(root->fs_info, device, NULL);
if (device->bdev) {
device->fs_devices->open_devices--;
@ -1981,8 +2014,6 @@ void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info,
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
struct btrfs_device *tgtdev)
{
struct btrfs_device *next_device;
mutex_lock(&uuid_mutex);
WARN_ON(!tgtdev);
mutex_lock(&fs_info->fs_devices->device_list_mutex);
@ -1995,13 +2026,8 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
}
fs_info->fs_devices->num_devices--;
next_device = list_entry(fs_info->fs_devices->devices.next,
struct btrfs_device, dev_list);
if (fs_info->sb->s_bdev &&
(tgtdev->bdev == fs_info->sb->s_bdev))
fs_info->sb->s_bdev = next_device->bdev;
if (tgtdev->bdev == fs_info->fs_devices->latest_bdev)
fs_info->fs_devices->latest_bdev = next_device->bdev;
btrfs_assign_next_active_device(fs_info, tgtdev, NULL);
list_del_rcu(&tgtdev->dev_list);
call_rcu(&tgtdev->rcu, free_device);

2
fs/btrfs/volumes.h
View File

@ -445,6 +445,8 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
struct btrfs_fs_devices **fs_devices_ret);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step);
void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info,
struct btrfs_device *device, struct btrfs_device *this_dev);
int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
char *device_path,
struct btrfs_device **device);