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Btrfs: fix truncate_space_check 

truncate_space_check is using btrfs_csum_bytes_to_leaves() but forgetting to
multiply by nodesize so we get an actual byte count.  We need a tracepoint here
so that we have the matching reserve for the release that will come later.  Also
add a comment to make clear what the intent of truncate_space_check is.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
steinar/wifi_calib_4_9_kernel
Josef Bacik 2016-01-13 11:48:06 -05:00 committed by David Sterba
parent fb4b10e5d5
commit dc95f7bfc5
1 changed files with 10 additions and 1 deletions
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11
fs/btrfs/inode.c
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@ -4211,11 +4211,20 @@ static int truncate_space_check(struct btrfs_trans_handle *trans,
{
int ret;
/*
* This is only used to apply pressure to the enospc system, we don't
* intend to use this reservation at all.
*/
bytes_deleted = btrfs_csum_bytes_to_leaves(root, bytes_deleted);
bytes_deleted *= root->nodesize;
ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv,
bytes_deleted, BTRFS_RESERVE_NO_FLUSH);
if (!ret)
if (!ret) {
trace_btrfs_space_reservation(root->fs_info, "transaction",
trans->transid,
bytes_deleted, 1);
trans->bytes_reserved += bytes_deleted;
}
return ret;
}