trans->aborted = errno;
/* Nothing used. The other threads that have joined this
* transaction may be able to continue. */
- if (!trans->blocks_used) {
+ if (!trans->blocks_used && list_empty(&trans->new_bgs)) {
const char *errstr;
errstr = btrfs_decode_error(errno);
"disabling disk space caching");
break;
case Opt_inode_cache:
- btrfs_set_and_info(root, CHANGE_INODE_CACHE,
+ btrfs_set_pending_and_info(info, INODE_MAP_CACHE,
"enabling inode map caching");
break;
case Opt_noinode_cache:
- btrfs_clear_and_info(root, CHANGE_INODE_CACHE,
+ btrfs_clear_pending_and_info(info, INODE_MAP_CACHE,
"disabling inode map caching");
break;
case Opt_clear_cache:
trans = btrfs_attach_transaction_barrier(root);
if (IS_ERR(trans)) {
/* no transaction, don't bother */
- if (PTR_ERR(trans) == -ENOENT)
- return 0;
- return PTR_ERR(trans);
+ if (PTR_ERR(trans) == -ENOENT) {
+ /*
+ * Exit unless we have some pending changes
+ * that need to go through commit
+ */
+ if (fs_info->pending_changes == 0)
+ return 0;
+ /*
+ * A non-blocking test if the fs is frozen. We must not
+ * start a new transaction here otherwise a deadlock
+ * happens. The pending operations are delayed to the
+ * next commit after thawing.
+ */
+ if (__sb_start_write(sb, SB_FREEZE_WRITE, false))
+ __sb_end_write(sb, SB_FREEZE_WRITE);
+ else
+ return 0;
+ trans = btrfs_start_transaction(root, 0);
+ }
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
}
return btrfs_commit_transaction(trans, root);
}
int i = 0, nr_devices;
int ret;
+ /*
+ * We aren't under the device list lock, so this is racey-ish, but good
+ * enough for our purposes.
+ */
nr_devices = fs_info->fs_devices->open_devices;
- BUG_ON(!nr_devices);
+ if (!nr_devices) {
+ smp_mb();
+ nr_devices = fs_info->fs_devices->open_devices;
+ ASSERT(nr_devices);
+ if (!nr_devices) {
+ *free_bytes = 0;
+ return 0;
+ }
+ }
devices_info = kmalloc_array(nr_devices, sizeof(*devices_info),
GFP_NOFS);
else
min_stripe_size = BTRFS_STRIPE_LEN;
- list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (fs_info->alloc_start)
+ mutex_lock(&fs_devices->device_list_mutex);
+ rcu_read_lock();
+ list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
if (!device->in_fs_metadata || !device->bdev ||
device->is_tgtdev_for_dev_replace)
continue;
+ if (i >= nr_devices)
+ break;
+
avail_space = device->total_bytes - device->bytes_used;
/* align with stripe_len */
skip_space = 1024 * 1024;
/* user can set the offset in fs_info->alloc_start. */
- if (fs_info->alloc_start + BTRFS_STRIPE_LEN <=
- device->total_bytes)
+ if (fs_info->alloc_start &&
+ fs_info->alloc_start + BTRFS_STRIPE_LEN <=
+ device->total_bytes) {
+ rcu_read_unlock();
skip_space = max(fs_info->alloc_start, skip_space);
- /*
- * btrfs can not use the free space in [0, skip_space - 1],
- * we must subtract it from the total. In order to implement
- * it, we account the used space in this range first.
- */
- ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1,
- &used_space);
- if (ret) {
- kfree(devices_info);
- return ret;
- }
+ /*
+ * btrfs can not use the free space in
+ * [0, skip_space - 1], we must subtract it from the
+ * total. In order to implement it, we account the used
+ * space in this range first.
+ */
+ ret = btrfs_account_dev_extents_size(device, 0,
+ skip_space - 1,
+ &used_space);
+ if (ret) {
+ kfree(devices_info);
+ mutex_unlock(&fs_devices->device_list_mutex);
+ return ret;
+ }
- /* calc the free space in [0, skip_space - 1] */
- skip_space -= used_space;
+ rcu_read_lock();
+
+ /* calc the free space in [0, skip_space - 1] */
+ skip_space -= used_space;
+ }
/*
* we can use the free space in [0, skip_space - 1], subtract
i++;
}
+ rcu_read_unlock();
+ if (fs_info->alloc_start)
+ mutex_unlock(&fs_devices->device_list_mutex);
nr_devices = i;
* holding chunk_muext to avoid allocating new chunks, holding
* device_list_mutex to avoid the device being removed
*/
- mutex_lock(&fs_info->fs_devices->device_list_mutex);
- mutex_lock(&fs_info->chunk_mutex);
rcu_read_lock();
list_for_each_entry_rcu(found, head, list) {
if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
buf->f_bfree -= block_rsv->size >> bits;
spin_unlock(&block_rsv->lock);
- buf->f_bavail = total_free_data;
+ buf->f_bavail = div_u64(total_free_data, factor);
ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data);
- if (ret) {
- mutex_unlock(&fs_info->chunk_mutex);
- mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ if (ret)
return ret;
- }
buf->f_bavail += div_u64(total_free_data, factor);
buf->f_bavail = buf->f_bavail >> bits;
- mutex_unlock(&fs_info->chunk_mutex);
- mutex_unlock(&fs_info->fs_devices->device_list_mutex);
buf->f_type = BTRFS_SUPER_MAGIC;
buf->f_bsize = dentry->d_sb->s_blocksize;
projects / cascardo / linux.git / blobdiff