diff options
| author | Qu Wenruo <wqu@suse.com> | 2018-01-31 13:56:15 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-03-31 01:26:56 +0200 |
| commit | ba89b80268c162eca8f23c5d71eb710d65a132fe (patch) | |
| tree | 503e0c94152392e92f75ccae0ab915018582b926 /fs | |
| parent | 6f47c706d9d4055ecdd125023577a20449c12b24 (diff) | |
| download | linux-ba89b80268c162eca8f23c5d71eb710d65a132fe.tar.bz2 | |
btrfs: volumes: Remove the meaningless condition of minimal nr_devs when allocating a chunk
When checking the minimal nr_devs, there is one dead and meaningless
condition:
if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This condition is meaningless, @devs_increment has nothing to do with
@sub_stripes.
In fact, in btrfs_raid_array[], profile with sub_stripes larger than 1
(RAID10) already has the @devs_increment set to 2.
So no need to multiple it by @sub_stripes.
And above condition is also dead.
For RAID10, @devs_increment * @sub_stripes equals 4, which is also the
@devs_min of RAID10.
For other profiles, @sub_stripes is always 1, and since @ndevs is
rounded down to @devs_increment, the condition will always be true.
Remove the meaningless condition to make later reader wander less.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/volumes.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 1e72357bdfa8..dcc2b486b2c5 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4837,13 +4837,12 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, /* round down to number of usable stripes */ ndevs = round_down(ndevs, devs_increment); - if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { + if (ndevs < devs_min) { ret = -ENOSPC; if (btrfs_test_opt(info, ENOSPC_DEBUG)) { btrfs_debug(info, "%s: not enough devices with free space: have=%d minimum required=%d", - __func__, ndevs, min(devs_min, - devs_increment * sub_stripes)); + __func__, ndevs, devs_min); } goto error; } |