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btrfs: change set_level() to bound the level passed in

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Currently, the only user of set_level() is zlib which sets an internal
workspace parameter. As level is now plumbed into get_workspace(), this
can be handled there rather than separately.

This repurposes set_level() to bound the level passed in so it can be
used when setting the mounts compression level and as well as verifying
the level before getting a workspace. The other benefit is this divides
the meaning of compress(0) and get_workspace(0). The former means we
want to use the default compression level of the compression type. The
latter means we can use any workspace available.

Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Dennis Zhou
2019-02-04 15:20:05 -05:00
committed by David Sterba
parent 7bf4994304
commit d0ab62ce2d
6 changed files with 41 additions and 21 deletions
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4
fs/btrfs/super.c
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@@ -529,7 +529,9 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
if (token != Opt_compress &&
token != Opt_compress_force)
info->compress_level =
btrfs_compress_str2level(args[0].from);
btrfs_compress_str2level(
BTRFS_COMPRESS_ZLIB,
args[0].from + 4);
btrfs_set_opt(info->mount_opt, COMPRESS);
btrfs_clear_opt(info->mount_opt, NODATACOW);
btrfs_clear_opt(info->mount_opt, NODATASUM);