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Btrfs: Add locking around volume management (device add/remove/balance) 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-07-08 14:19:17 -04:00
parent a7a16fd772
commit 7d9eb12c87
6 changed files with 104 additions and 41 deletions
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4
fs/btrfs/ctree.c
View File

@ -1251,10 +1251,6 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
WARN_ON(p->nodes[0] != NULL);
WARN_ON(cow && root == root->fs_info->extent_root &&
!mutex_is_locked(&root->fs_info->alloc_mutex));
WARN_ON(root == root->fs_info->chunk_root &&
!mutex_is_locked(&root->fs_info->chunk_mutex));
WARN_ON(root == root->fs_info->dev_root &&
!mutex_is_locked(&root->fs_info->chunk_mutex));
if (ins_len < 0)
lowest_unlock = 2;
again:

1
fs/btrfs/ctree.h
View File

@ -523,6 +523,7 @@ struct btrfs_fs_info {
struct mutex alloc_mutex;
struct mutex chunk_mutex;
struct mutex drop_mutex;
struct mutex volume_mutex;
struct list_head trans_list;
struct list_head hashers;
struct list_head dead_roots;

1
fs/btrfs/disk-io.c
View File

@ -1287,6 +1287,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
mutex_init(&fs_info->chunk_mutex);
mutex_init(&fs_info->transaction_kthread_mutex);
mutex_init(&fs_info->cleaner_mutex);
mutex_init(&fs_info->volume_mutex);
#if 0
ret = add_hasher(fs_info, "crc32c");

75
fs/btrfs/extent-tree.c
View File

@ -245,6 +245,7 @@ static int noinline find_search_start(struct btrfs_root *root,
u64 search_start = *start_ret;
int wrapped = 0;
WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
free_space_cache = &root->fs_info->free_space_cache;
@ -1242,6 +1243,7 @@ static int update_block_group(struct btrfs_trans_handle *trans,
u64 start;
u64 end;
WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
while(total) {
cache = btrfs_lookup_block_group(info, bytenr);
if (!cache) {
@ -1297,6 +1299,7 @@ static int update_pinned_extents(struct btrfs_root *root,
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *fs_info = root->fs_info;
WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
if (pin) {
set_extent_dirty(&fs_info->pinned_extents,
bytenr, bytenr + num - 1, GFP_NOFS);
@ -1391,6 +1394,7 @@ static int finish_current_insert(struct btrfs_trans_handle *trans,
int level;
int err = 0;
WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
btrfs_set_stack_extent_refs(&extent_item, 1);
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
path = btrfs_alloc_path();
@ -1437,6 +1441,7 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
{
int err = 0;
WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
if (!pending) {
struct extent_buffer *buf;
buf = btrfs_find_tree_block(root, bytenr, num_bytes);
@ -1490,6 +1495,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
struct btrfs_extent_item *ei;
u32 refs;
WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
key.objectid = bytenr;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
key.offset = num_bytes;
@ -1619,6 +1625,7 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct
struct extent_io_tree *pending_del;
struct extent_io_tree *pinned_extents;
WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
pending_del = &extent_root->fs_info->pending_del;
pinned_extents = &extent_root->fs_info->pinned_extents;
@ -2428,6 +2435,10 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_node_key(node, &found_key, path->slots[level]);
WARN_ON(memcmp(&found_key, &root_item->drop_progress,
sizeof(found_key)));
/*
* unlock our path, this is safe because only this
* function is allowed to delete this snapshot
*/
for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
if (path->nodes[i] && path->locks[i]) {
path->locks[i] = 0;
@ -2611,7 +2622,6 @@ static int find_root_for_ref(struct btrfs_root *root,
u64 root_search_start = BTRFS_FS_TREE_OBJECTID;
u64 found_bytenr;
int ret;
int i;
root_location.offset = (u64)-1;
root_location.type = BTRFS_ROOT_ITEM_KEY;
@ -2635,12 +2645,6 @@ static int find_root_for_ref(struct btrfs_root *root,
found_bytenr = path->nodes[level]->start;
}
for (i = level; i < BTRFS_MAX_LEVEL; i++) {
if (!path->nodes[i])
break;
free_extent_buffer(path->nodes[i]);
path->nodes[i] = NULL;
}
btrfs_release_path(cur_root, path);
if (found_bytenr == bytenr) {
@ -2689,6 +2693,8 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
int ret;
int level;
WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_ref);
ref_root = btrfs_ref_root(path->nodes[0], ref);
@ -2707,6 +2713,7 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
&root_location);
BUG_ON(!found_root);
mutex_unlock(&extent_root->fs_info->alloc_mutex);
if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
found_key.objectid = ref_objectid;
@ -2748,9 +2755,9 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
/* this can happen if the reference is not against
* the latest version of the tree root
*/
if (is_bad_inode(inode)) {
if (is_bad_inode(inode))
goto out;
}
*last_file_objectid = inode->i_ino;
*last_file_root = found_root->root_key.objectid;
*last_file_offset = ref_offset;
@ -2760,7 +2767,7 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
} else {
struct btrfs_trans_handle *trans;
struct extent_buffer *eb;
int i;
int needs_lock = 0;
eb = read_tree_block(found_root, extent_key->objectid,
extent_key->offset, 0);
@ -2782,26 +2789,40 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
if (ret)
goto out;
/*
* right here almost anything could happen to our key,
* but that's ok. The cow below will either relocate it
* or someone else will have relocated it. Either way,
* it is in a different spot than it was before and
* we're happy.
*/
trans = btrfs_start_transaction(found_root, 1);
if (found_root == extent_root->fs_info->extent_root ||
found_root == extent_root->fs_info->chunk_root ||
found_root == extent_root->fs_info->dev_root) {
needs_lock = 1;
mutex_lock(&extent_root->fs_info->alloc_mutex);
}
path->lowest_level = level;
path->reada = 2;
ret = btrfs_search_slot(trans, found_root, &found_key, path,
0, 1);
path->lowest_level = 0;
for (i = level; i < BTRFS_MAX_LEVEL; i++) {
if (!path->nodes[i])
break;
free_extent_buffer(path->nodes[i]);
path->nodes[i] = NULL;
}
btrfs_release_path(found_root, path);
if (found_root == found_root->fs_info->extent_root)
btrfs_extent_post_op(trans, found_root);
btrfs_end_transaction(trans, found_root);
}
if (needs_lock)
mutex_unlock(&extent_root->fs_info->alloc_mutex);
btrfs_end_transaction(trans, found_root);
}
out:
mutex_lock(&extent_root->fs_info->alloc_mutex);
return 0;
}
@ -2943,7 +2964,10 @@ int __alloc_chunk_for_shrink(struct btrfs_root *root,
if (btrfs_block_group_used(&shrink_block_group->item) > 0) {
mutex_unlock(&root->fs_info->alloc_mutex);
trans = btrfs_start_transaction(root, 1);
mutex_lock(&root->fs_info->alloc_mutex);
new_alloc_flags = update_block_group_flags(root,
shrink_block_group->flags);
if (new_alloc_flags != shrink_block_group->flags) {
@ -2954,7 +2978,10 @@ int __alloc_chunk_for_shrink(struct btrfs_root *root,
}
do_chunk_alloc(trans, root->fs_info->extent_root,
calc + 2 * 1024 * 1024, new_alloc_flags, force);
mutex_unlock(&root->fs_info->alloc_mutex);
btrfs_end_transaction(trans, root);
mutex_lock(&root->fs_info->alloc_mutex);
}
return 0;
}
@ -3031,9 +3058,9 @@ again:
if (ret < 0)
goto out;
next:
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
next:
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
@ -3083,6 +3110,7 @@ next:
printk("btrfs relocate found %llu last extent was %llu\n",
(unsigned long long)total_found,
(unsigned long long)found_key.objectid);
mutex_unlock(&root->fs_info->alloc_mutex);
trans = btrfs_start_transaction(tree_root, 1);
btrfs_commit_transaction(trans, tree_root);
@ -3090,6 +3118,7 @@ next:
trans = btrfs_start_transaction(tree_root, 1);
btrfs_commit_transaction(trans, tree_root);
mutex_lock(&root->fs_info->alloc_mutex);
goto again;
}
@ -3097,7 +3126,10 @@ next:
* we've freed all the extents, now remove the block
* group item from the tree
*/
mutex_unlock(&root->fs_info->alloc_mutex);
trans = btrfs_start_transaction(root, 1);
mutex_lock(&root->fs_info->alloc_mutex);
memcpy(&key, &shrink_block_group->key, sizeof(key));
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
@ -3119,8 +3151,12 @@ next:
kfree(shrink_block_group);
btrfs_del_item(trans, root, path);
btrfs_release_path(root, path);
mutex_unlock(&root->fs_info->alloc_mutex);
btrfs_commit_transaction(trans, root);
mutex_lock(&root->fs_info->alloc_mutex);
/* the code to unpin extents might set a few bits in the free
* space cache for this range again
*/
@ -3263,6 +3299,7 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
struct btrfs_block_group_cache *cache;
struct extent_io_tree *block_group_cache;
WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
extent_root = root->fs_info->extent_root;
block_group_cache = &root->fs_info->block_group_cache;

6
fs/btrfs/ioctl.c
View File

@ -307,8 +307,7 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
goto out;
}
mutex_lock(&root->fs_info->alloc_mutex);
mutex_lock(&root->fs_info->chunk_mutex);
mutex_lock(&root->fs_info->volume_mutex);
sizestr = vol_args->name;
devstr = strchr(sizestr, ':');
if (devstr) {
@ -378,8 +377,7 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
}
out_unlock:
mutex_lock(&root->fs_info->alloc_mutex);
mutex_lock(&root->fs_info->chunk_mutex);
mutex_unlock(&root->fs_info->volume_mutex);
out:
kfree(vol_args);
return ret;

58
fs/btrfs/volumes.c
View File

@ -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;