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Btrfs: protect devices list with its mutex 

Since we've kill the bigger one volume_mutex, we need to add devices
list mutex back.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Liu Bo 2012-11-14 14:35:30 +00:00 committed by Josef Bacik
parent b53d3f5db2
commit d25628bdd6
1 changed files with 5 additions and 4 deletions
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9
fs/btrfs/volumes.c
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@ -1681,16 +1681,17 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
filemap_write_and_wait(bdev->bd_inode->i_mapping);
devices = &root->fs_info->fs_devices->devices;
/*
* we have the volume lock, so we don't need the extra
* device list mutex while reading the list here.
*/
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
list_for_each_entry(device, devices, dev_list) {
if (device->bdev == bdev) {
ret = -EEXIST;
mutex_unlock(
&root->fs_info->fs_devices->device_list_mutex);
goto error;
}
}
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
device = kzalloc(sizeof(*device), GFP_NOFS);
if (!device) {