diff options
author | Chris Mason <chris.mason@oracle.com> | 2008-07-08 14:19:17 -0400 |
---|---|---|
committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:04 -0400 |
commit | 7d9eb12c8739e7dc80c78c6b3596f912ecd8f941 (patch) | |
tree | 000608285b44920f22e0888753b36299bc762cef /fs/btrfs/volumes.c | |
parent | a7a16fd772620605c76e8ac8bdbc8ccc9e3df1a0 (diff) | |
download | kernel_samsung_espresso10-7d9eb12c8739e7dc80c78c6b3596f912ecd8f941.zip kernel_samsung_espresso10-7d9eb12c8739e7dc80c78c6b3596f912ecd8f941.tar.gz kernel_samsung_espresso10-7d9eb12c8739e7dc80c78c6b3596f912ecd8f941.tar.bz2 |
Btrfs: Add locking around volume management (device add/remove/balance)
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r-- | fs/btrfs/volumes.c | 58 |
1 files changed, 44 insertions, 14 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 4e7cee2..5e6ee7a 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -56,6 +56,18 @@ void btrfs_unlock_volumes(void) mutex_unlock(&uuid_mutex); } +static void lock_chunks(struct btrfs_root *root) +{ + mutex_lock(&root->fs_info->alloc_mutex); + mutex_lock(&root->fs_info->chunk_mutex); +} + +static void unlock_chunks(struct btrfs_root *root) +{ + mutex_unlock(&root->fs_info->alloc_mutex); + mutex_unlock(&root->fs_info->chunk_mutex); +} + int btrfs_cleanup_fs_uuids(void) { struct btrfs_fs_devices *fs_devices; @@ -822,6 +834,7 @@ static int btrfs_rm_dev_item(struct btrfs_root *root, key.objectid = BTRFS_DEV_ITEMS_OBJECTID; key.type = BTRFS_DEV_ITEM_KEY; key.offset = device->devid; + lock_chunks(root); ret = btrfs_search_slot(trans, root, &key, path, -1, 1); if (ret < 0) @@ -856,6 +869,7 @@ static int btrfs_rm_dev_item(struct btrfs_root *root, total_bytes - 1); out: btrfs_free_path(path); + unlock_chunks(root); btrfs_commit_transaction(trans, root); return ret; } @@ -870,9 +884,8 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) u64 devid; int ret = 0; - mutex_lock(&root->fs_info->alloc_mutex); - mutex_lock(&root->fs_info->chunk_mutex); mutex_lock(&uuid_mutex); + mutex_lock(&root->fs_info->volume_mutex); all_avail = root->fs_info->avail_data_alloc_bits | root->fs_info->avail_system_alloc_bits | @@ -988,9 +1001,8 @@ error_close: if (bdev) close_bdev_excl(bdev); out: + mutex_unlock(&root->fs_info->volume_mutex); mutex_unlock(&uuid_mutex); - mutex_unlock(&root->fs_info->chunk_mutex); - mutex_unlock(&root->fs_info->alloc_mutex); return ret; } @@ -1010,10 +1022,10 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path) return -EIO; } - mutex_lock(&root->fs_info->alloc_mutex); - mutex_lock(&root->fs_info->chunk_mutex); + mutex_lock(&root->fs_info->volume_mutex); trans = btrfs_start_transaction(root, 1); + lock_chunks(root); devices = &root->fs_info->fs_devices->devices; list_for_each(cur, devices) { device = list_entry(cur, struct btrfs_device, dev_list); @@ -1065,9 +1077,9 @@ 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++; out: + unlock_chunks(root); btrfs_end_transaction(trans, root); - mutex_unlock(&root->fs_info->chunk_mutex); - mutex_unlock(&root->fs_info->alloc_mutex); + mutex_unlock(&root->fs_info->volume_mutex); return ret; @@ -1122,7 +1134,7 @@ out: return ret; } -int btrfs_grow_device(struct btrfs_trans_handle *trans, +static int __btrfs_grow_device(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 new_size) { struct btrfs_super_block *super_copy = @@ -1134,6 +1146,16 @@ int btrfs_grow_device(struct btrfs_trans_handle *trans, return btrfs_update_device(trans, device); } +int btrfs_grow_device(struct btrfs_trans_handle *trans, + struct btrfs_device *device, u64 new_size) +{ + int ret; + lock_chunks(device->dev_root); + ret = __btrfs_grow_device(trans, device, new_size); + unlock_chunks(device->dev_root); + return ret; +} + static int btrfs_free_chunk(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 chunk_tree, u64 chunk_objectid, @@ -1234,6 +1256,8 @@ int btrfs_relocate_chunk(struct btrfs_root *root, trans = btrfs_start_transaction(root, 1); BUG_ON(!trans); + lock_chunks(root); + /* * step two, delete the device extents and the * chunk tree entries @@ -1278,6 +1302,7 @@ int btrfs_relocate_chunk(struct btrfs_root *root, /* once for us */ free_extent_map(em); + unlock_chunks(root); btrfs_end_transaction(trans, root); return 0; } @@ -1308,8 +1333,7 @@ int btrfs_balance(struct btrfs_root *dev_root) struct btrfs_key found_key; - BUG(); /* FIXME, needs locking */ - + mutex_lock(&dev_root->fs_info->volume_mutex); dev_root = dev_root->fs_info->dev_root; /* step one make some room on all the devices */ @@ -1355,13 +1379,14 @@ int btrfs_balance(struct btrfs_root *dev_root) ret = btrfs_previous_item(chunk_root, path, 0, BTRFS_CHUNK_ITEM_KEY); - if (ret) { + if (ret) break; - } + btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); if (found_key.objectid != key.objectid) break; + chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], struct btrfs_chunk); @@ -1370,16 +1395,17 @@ int btrfs_balance(struct btrfs_root *dev_root) if (key.offset == 0) break; + btrfs_release_path(chunk_root, path); ret = btrfs_relocate_chunk(chunk_root, chunk_root->root_key.objectid, found_key.objectid, found_key.offset); BUG_ON(ret); - btrfs_release_path(chunk_root, path); } ret = 0; error: btrfs_free_path(path); + mutex_unlock(&dev_root->fs_info->volume_mutex); return ret; } @@ -1419,14 +1445,18 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) path->reada = 2; + lock_chunks(root); + device->total_bytes = new_size; ret = btrfs_update_device(trans, device); if (ret) { + unlock_chunks(root); btrfs_end_transaction(trans, root); goto done; } WARN_ON(diff > old_total); btrfs_set_super_total_bytes(super_copy, old_total - diff); + unlock_chunks(root); btrfs_end_transaction(trans, root); key.objectid = device->devid; |