From: Jia Zhu <zhujia.zj@bytedance.com> anolis inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IB5UKT Reference: https://gitee.com/anolis/cloud-kernel/commit/d699a85b7a18 -------------------------------- ANBZ: #3234 commit 2ef164414123fcf574aff7a0be5f71f7e60a3fec upstream. Introduce 'domain_id' mount option to enable shared domain sementics. In which case, the related cookie is shared if two mountpoints in the same domain have the same data blob. Users could specify the name of domain by this mount option. Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com> Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com> Link: https://lore.kernel.org/r/20220918043456.147-7-zhujia.zj@bytedance.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Link: https://gitee.com/anolis/cloud-kernel/pulls/893 Conflicts: fs/erofs/super.c Signed-off-by: Baokun Li <libaokun1@huawei.com> --- fs/erofs/super.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 7b24b6952d30..14902817d4e9 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -318,6 +318,7 @@ enum { Opt_cache_strategy, Opt_device, Opt_fsid, + Opt_domain_id, Opt_err }; @@ -335,6 +336,7 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = { erofs_param_cache_strategy), fsparam_string("device", Opt_device), fsparam_string("fsid", Opt_fsid), + fsparam_string("domain_id", Opt_domain_id), {} }; @@ -406,6 +408,16 @@ static int erofs_fc_parse_param(struct fs_context *fc, #else errorfc(fc, "fsid option not supported"); return -EINVAL; +#endif + break; + case Opt_domain_id: +#ifdef CONFIG_EROFS_FS_ONDEMAND + kfree(ctx->opt.domain_id); + ctx->opt.domain_id = kstrdup(param->string, GFP_KERNEL); + if (!ctx->opt.domain_id) + return -ENOMEM; +#else + errorfc(fc, "domain_id option not supported"); #endif break; default: @@ -499,6 +511,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) sb->s_fs_info = sbi; sbi->opt = ctx->opt; ctx->opt.fsid = NULL; + ctx->opt.domain_id = NULL; sbi->devs = ctx->devs; ctx->devs = NULL; @@ -624,6 +637,7 @@ static void erofs_fc_free(struct fs_context *fc) erofs_free_dev_context(ctx->devs); kfree(ctx->opt.fsid); + kfree(ctx->opt.domain_id); kfree(ctx); } @@ -692,6 +706,7 @@ static void erofs_kill_sb(struct super_block *sb) erofs_free_dev_context(sbi->devs); erofs_fscache_unregister_fs(sb); kfree(sbi->opt.fsid); + kfree(sbi->opt.domain_id); kfree(sbi); sb->s_fs_info = NULL; } @@ -830,6 +845,8 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root) #ifdef CONFIG_EROFS_FS_ONDEMAND if (sbi->opt.fsid) seq_printf(seq, ",fsid=%s", sbi->opt.fsid); + if (opt->domain_id) + seq_printf(seq, ",domain_id=%s", opt->domain_id); #endif return 0; } -- 2.46.1