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btrfs: Output more info for enospc_debug mount option 

As one user in mail list report reproducible balance ENOSPC error, it's
better to add more debug info for enospc_debug mount option.

Reported-by: Marc Haber <mh+linux-btrfs@zugschlus.de>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2016-03-23 11:38:17 +08:00 committed by David Sterba
parent 264813acb1
commit 0305bc2793
1 changed files with 19 additions and 2 deletions
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21
fs/btrfs/extent-tree.c
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@ -9386,15 +9386,23 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
u64 dev_min = 1;
u64 dev_nr = 0;
u64 target;
int debug;
int index;
int full = 0;
int ret = 0;
debug = btrfs_test_opt(root, ENOSPC_DEBUG);
block_group = btrfs_lookup_block_group(root->fs_info, bytenr);
/* odd, couldn't find the block group, leave it alone */
if (!block_group)
if (!block_group) {
if (debug)
btrfs_warn(root->fs_info,
"can't find block group for bytenr %llu",
bytenr);
return -1;
}
min_free = btrfs_block_group_used(&block_group->item);
@ -9448,8 +9456,13 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
* this is just a balance, so if we were marked as full
* we know there is no space for a new chunk
*/
if (full)
if (full) {
if (debug)
btrfs_warn(root->fs_info,
"no space to alloc new chunk for block group %llu",
block_group->key.objectid);
goto out;
}
index = get_block_group_index(block_group);
}
@ -9496,6 +9509,10 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
ret = -1;
}
}
if (debug && ret == -1)
btrfs_warn(root->fs_info,
"no space to allocate a new chunk for block group %llu",
block_group->key.objectid);
mutex_unlock(&root->fs_info->chunk_mutex);
btrfs_end_transaction(trans, root);
out: