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Btrfs: allow mount -o remount,compress=no
Btrfs allows to turn on compression on a mounted and used filesystem by issuing mount -o remount,compress=lzo. This patch allows to turn compression off again while the filesystem is mounted. As suggested by David Sterba if the compress-force option was set, it is implicitly cleared if compression is turned off. Tested-by: David Sterba <dsterba@suse.cz> Signed-off-by: Arnd Hannemann <arnd@arndnet.de>
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1 changed files with 8 additions and 1 deletions
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@ -396,15 +396,22 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
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strcmp(args[0].from, "zlib") == 0) {
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compress_type = "zlib";
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info->compress_type = BTRFS_COMPRESS_ZLIB;
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btrfs_set_opt(info->mount_opt, COMPRESS);
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} else if (strcmp(args[0].from, "lzo") == 0) {
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compress_type = "lzo";
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info->compress_type = BTRFS_COMPRESS_LZO;
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btrfs_set_opt(info->mount_opt, COMPRESS);
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} else if (strncmp(args[0].from, "no", 2) == 0) {
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compress_type = "no";
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info->compress_type = BTRFS_COMPRESS_NONE;
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btrfs_clear_opt(info->mount_opt, COMPRESS);
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btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
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compress_force = false;
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} else {
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ret = -EINVAL;
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goto out;
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}
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btrfs_set_opt(info->mount_opt, COMPRESS);
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if (compress_force) {
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btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
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pr_info("btrfs: force %s compression\n",
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