diff options
| author | Jia Zhu <zhujia.zj@bytedance.com> | 2022-09-18 12:34:56 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-20 08:01:54 +0800 |
| commit | 2ef164414123fcf574aff7a0be5f71f7e60a3fec (patch) | |
| tree | aefc6bba528e9dfa4f8e9f47103b4fd8ff78b83e /fs/erofs/super.c | |
| parent | 7d41963759feb3cfa4c1164b8b9db5d1f055932d (diff) | |
erofs: introduce 'domain_id' mount option
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>
Diffstat (limited to 'fs/erofs/super.c')
| -rw-r--r-- | fs/erofs/super.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/erofs/super.c b/fs/erofs/super.c index ab746181ae08..9f7fe6c04e65 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -440,6 +440,7 @@ enum { Opt_dax_enum, Opt_device, Opt_fsid, + Opt_domain_id, Opt_err }; @@ -465,6 +466,7 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = { fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums), fsparam_string("device", Opt_device), fsparam_string("fsid", Opt_fsid), + fsparam_string("domain_id", Opt_domain_id), {} }; @@ -570,6 +572,16 @@ static int erofs_fc_parse_param(struct fs_context *fc, errorfc(fc, "fsid option not supported"); #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: return -ENOPARAM; } @@ -702,6 +714,7 @@ 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; @@ -846,6 +859,7 @@ 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); } @@ -916,6 +930,7 @@ static void erofs_kill_sb(struct super_block *sb) fs_put_dax(sbi->dax_dev, NULL); erofs_fscache_unregister_fs(sb); kfree(sbi->opt.fsid); + kfree(sbi->opt.domain_id); kfree(sbi); sb->s_fs_info = NULL; } @@ -1068,6 +1083,8 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root) #ifdef CONFIG_EROFS_FS_ONDEMAND if (opt->fsid) seq_printf(seq, ",fsid=%s", opt->fsid); + if (opt->domain_id) + seq_printf(seq, ",domain_id=%s", opt->domain_id); #endif return 0; } |