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Commit b7c47bbb authored by Tsutomu Itoh's avatar Tsutomu Itoh Committed by David Sterba
Browse files

Btrfs: fix output of compression message in btrfs_parse_options() 



The compression message might not be correctly output.
Fix it.

[[before fix]]

# mount -o compress /dev/sdb3 /test3
[  996.874264] BTRFS info (device sdb3): disk space caching is enabled
[  996.874268] BTRFS: has skinny extents
# mount | grep /test3
/dev/sdb3 on /test3 type btrfs (rw,relatime,compress=zlib,space_cache,subvolid=5,subvol=/)

# mount -o remount,compress-force /dev/sdb3 /test3
[ 1035.075017] BTRFS info (device sdb3): force zlib compression
[ 1035.075021] BTRFS info (device sdb3): disk space caching is enabled
# mount | grep /test3
/dev/sdb3 on /test3 type btrfs (rw,relatime,compress-force=zlib,space_cache,subvolid=5,subvol=/)

# mount -o remount,compress /dev/sdb3 /test3
[ 1053.679092] BTRFS info (device sdb3): disk space caching is enabled
# mount | grep /test3
/dev/sdb3 on /test3 type btrfs (rw,relatime,compress=zlib,space_cache,subvolid=5,subvol=/)

[[after fix]]

# mount -o compress /dev/sdb3 /test3
[  401.021753] BTRFS info (device sdb3): use zlib compression
[  401.021758] BTRFS info (device sdb3): disk space caching is enabled
[  401.021760] BTRFS: has skinny extents
# mount | grep /test3
/dev/sdb3 on /test3 type btrfs (rw,relatime,compress=zlib,space_cache,subvolid=5,subvol=/)

# mount -o remount,compress-force /dev/sdb3 /test3
[  439.824624] BTRFS info (device sdb3): force zlib compression
[  439.824629] BTRFS info (device sdb3): disk space caching is enabled
# mount | grep /test3
/dev/sdb3 on /test3 type btrfs (rw,relatime,compress-force=zlib,space_cache,subvolid=5,subvol=/)

# mount -o remount,compress /dev/sdb3 /test3
[  459.918430] BTRFS info (device sdb3): use zlib compression
[  459.918434] BTRFS info (device sdb3): disk space caching is enabled
# mount | grep /test3
/dev/sdb3 on /test3 type btrfs (rw,relatime,compress=zlib,space_cache,subvolid=5,subvol=/)

Signed-off-by: default avatarTsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent f32e48e9

fs/btrfs/super.c

+22 −7
Original line number Diff line number Diff line
@@ -381,6 +381,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) 
	int ret = 0;

	char *compress_type;

	bool compress_force = false;

	enum btrfs_compression_type saved_compress_type;

	bool saved_compress_force;

	int no_compress = 0;



	cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy);

	if (cache_gen)
@@ -458,6 +461,10 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) 
			/* Fallthrough */

		case Opt_compress:

		case Opt_compress_type:

			saved_compress_type = btrfs_test_opt(root, COMPRESS) ?

				info->compress_type : BTRFS_COMPRESS_NONE;

			saved_compress_force =

				btrfs_test_opt(root, FORCE_COMPRESS);

			if (token == Opt_compress ||

			    token == Opt_compress_force ||

			    strcmp(args[0].from, "zlib") == 0) {
@@ -466,6 +473,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) 
				btrfs_set_opt(info->mount_opt, COMPRESS);

				btrfs_clear_opt(info->mount_opt, NODATACOW);

				btrfs_clear_opt(info->mount_opt, NODATASUM);

				no_compress = 0;

			} else if (strcmp(args[0].from, "lzo") == 0) {

				compress_type = "lzo";

				info->compress_type = BTRFS_COMPRESS_LZO;
@@ -473,25 +481,21 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) 
				btrfs_clear_opt(info->mount_opt, NODATACOW);

				btrfs_clear_opt(info->mount_opt, NODATASUM);

				btrfs_set_fs_incompat(info, COMPRESS_LZO);

				no_compress = 0;

			} else if (strncmp(args[0].from, "no", 2) == 0) {

				compress_type = "no";

				btrfs_clear_opt(info->mount_opt, COMPRESS);

				btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);

				compress_force = false;

				no_compress++;

			} else {

				ret = -EINVAL;

				goto out;

			}



			if (compress_force) {

				btrfs_set_and_info(root, FORCE_COMPRESS,

						   "force %s compression",

						   compress_type);

				btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);

			} else {

				if (!btrfs_test_opt(root, COMPRESS))

					btrfs_info(root->fs_info,

						   "btrfs: use %s compression",

						   compress_type);

				/*

				 * If we remount from compress-force=xxx to

				 * compress=xxx, we need clear FORCE_COMPRESS
@@ -500,6 +504,17 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) 
				 */

				btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);

			}

			if ((btrfs_test_opt(root, COMPRESS) &&

			     (info->compress_type != saved_compress_type ||

			      compress_force != saved_compress_force)) ||

			    (!btrfs_test_opt(root, COMPRESS) &&

			     no_compress == 1)) {

				btrfs_info(root->fs_info,

					   "%s %s compression",

					   (compress_force) ? "force" : "use",

					   compress_type);

			}

			compress_force = false;

			break;

		case Opt_ssd:

			btrfs_set_and_info(root, SSD,